BACKGROUND OF THE INVENTION
[0001] The present invention relates to a bag-in-carton with a flexible inner bag adhered
to inside surfaces of a substantially rectangular parallelepiped carton, and a method
for forming the bag-in-carton.
[0002] As a liquid packaging container bag-in-cartons have been conventionally used. The
bag-in-carton usually has a rectangular parallelepiped form having a flat bottom panel,
a top panel, and four flat side panels between the bottom and the top panels. The
inner bag is adhered to the inside surfaces of the four side panels. The bag-in-carton
is generally used in packaging liquids of low viscosities, such as juice, liquor,
etc. Practically when a content is discharged from the bag-in-carton, air corresponding
to a discharged amount of the content enters the bag-in-carton.
[0003] When the bag-in-carton is used in packaging a liquid of high viscosity, such as ink,
or others, it is necessary to draw the liquid through the pouring spout when the liquid
is discharged from the bag-in-carton. But it is difficult to let air in the inner
bag. Accordingly it is necessary to deform the inner bag to decrease its volume corresponding
to a discharge of the content in the inner bag. The conventional bag-in-carton whose
inner bag is adhered to the four inside surfaces of the carton cannot have the inner
bag deformed when a content thereof is discharged, which makes it impossible to use
the bag-in-carton as it is in packaging a liquid of high viscosity.
[0004] Furthermore, in using the bag-in-carton in packaging ink for printing machines, the
pouring spout of the bag-in-carton is connected to the connector of a printing machine
to discharge the content of the bag-in-carton.
[0005] To meet the purpose of feeding a constant amount of ink to a printing machine, it
is necessary that an ink feed amount per a unit hour is stably constant.
[0006] JP 7-257645 A discloses a bag-in-box in which a bag body made of a flexible resin
film is contained in a rigid card board box. The bag body and the box body are stuck
at the whole area or a partial area of a zone containing a triangle including the
right end and the bottom of the left side plate, at least the upper end part of the
front plate and a triangle including the left end part and the bottom of the right
side plate. Thus, the bag is adhered to one half of the side plates. In this embodiment
the half of the bag body which is not stuck with the box body moves inside the part
of the bag body stuck with the box body during discharging the content of the bag
body. However, it is difficult to control the deformation of the bag body during discharging
the content and to realise a feeding of a constant amount of content out of the bag
body.
[0007] JP-6 1305 A discloses a method for producing a bag-in-carton comprising the following
steps after setting up a carton blank including an inner flexible bag into a rectangular
parallelepiped form: A bottom portion of the inner bag is heat sealed and forced into
the carton. Then the bottom panels of the carton are folded to form one-side closed
portion of the carton. Then the top portion of the inner bag is heat-sealed and forced
into the carton by a pressing-up-plate. Then the top panels of the carton are folded
to form the other closed side portion of the carton. This method does not allow to
precisely arrange the inner bag inside the carton to ensure a controlled deformation
of the inner bag during discharge of the content of the inner bag and to ensure a
constant feeding amount of the content.
[0008] It is object of the invention to provide an improved bag-in-carton which can ensure
a controlled deformation of the inner bag during discharging the content and a constant
feed amount during discharging the content, and a method for forming such bag-in-carton.
[0009] This object is achieved by a bag-in-carton having the features defined in claim 1
or 5 and a method having the features defined in claim 9.
[0010] Preferred embodiments are defined in the dependent claims.
[0011] According to the characteristic features of the present invention, when the content
is drawn out through the pouring spout, the inner bag starts being released from the
inner-bag adhering regions provided partially on the surfaces remote from the pouring
spout attaching panel, and from the inner-bag adhering regions provided on the substantially
entire inside surfaces of a pair of side panels opposed to each other. As the content
is drawn, the inner bag is deformed and is moved to the pouring spout. The releasable
part of the inner bag is withdrawn into the unreleasable part thereof to thereby discharge
substantially all the content through the pouring spout. During this operation, the
inner bag is uniformly deformed, with a result that the content is supplied stably
and constantly.
[0012] According to the first preferred embodiment, one seal-closed end of the inner bag
is in agreement with one tight closed end of the carton, whereby the shape and a volume
of the inner bag can be retained constant.
[0013] According to the second preferred embodiment the back sealed portion of the tubular
film is relatively hard. Because of the back sealed portion located on the inside
surface of the panel opposed to the pouring spout attaching panel of, the carton,
when the content is drawn out through the pouring spout, the inner bag can be deformed
horizontally symmetrically with respect to the pouring spout.
[0014] According to one alternative of claim 5 when the content is drawn out through the
pouring spout, the inner bag starts being released from the inner-bag adhering regions
provided on the inside surfaces of a pair of side panels of the carton opposed to
each other. As the content is drawn out, the released part of the inner bag is deformed
and moved to the pouring spout to be withdrawn into the unreleasable part of the inner
bag which is adhered to the carton to thereby drive out substantially all the content
through the pouring spout. In this operation, on the pair of the opposed side panels
the release of the inner bag starts on the side of the remote end part and finishes
at the strips, whereby the inner bag is uniformly deformed, and accordingly the content
can be supplied stably and constantly.
[0015] According to another alternative of claim 5 the inner bag is adhered to the inside
surfaces of a pair of side panels except cuts extended substantially parallel with
a straight line interconnecting the pouring spout and the remote end part of the carton
which is remotest from the pouring spout, the inner bag can be readily released on
the side of the remote end part on the pair of side panels when the inner bag is released
from the inside surfaces of the carton as the content of the inner bag is decreased.
[0016] According to a further alternative defined in claim 5 the inner bag is adhered to
the substantially entire parts of the inside surfaces of the pair of opposed side
panels which (parts) are nearer to the pouring spout with respect to the substantial
middle of a straight line interconnecting the pouring spout and the remote end part
of the carton which is remotest from the pouring spout, and are partially adhered
on the side of the remote end part. Accordingly when the inner bag is released from
the inside surfaces of the carton as the content of the inner bag is decreased, the
inner bag can be readily released from the pair of side panels first on the side of
the remote end part.
[0017] According to a further alternative defined in claim 5 the inner bag is adhered to
the inside surfaces of the pair of opposed side panels so that the inner-bag adhering
regions decrease in area gradually from the side of the pouring spout to the side
of the remote end part, whereby the inner bag can be readily released from the pair
of side panels first on the side of the remote end part when the inner bag is released
from the inside surfaces of the carton.
[0018] According to the method of the present invention, one side seal-closed portion of
the inner bag is pressed against one side closed portion of the carton by a having
a jig, whereby a bag-in-carton having the one side-closed portion of the inner bag
formed in accordance with the one side closed portion of the carton can be formed.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019]
FIG. 1A is a side sectional view of the bag-in-carton according to a first embodiment
of the present invention in its state where the bag-in-carton is filled with a content.
FIG. 1B is a side sectional view of the bag-in-carton according to the first embodiment
of the present invention in its state where the content is drawn out.
FIG. 2 is a diagrammatic perspective view of the bag-in-carton.
FIG. 3 is a diagrammatic plan view of a carton blank for the bag-in-carton, and a
tubular film.
FIG. 4 is a diagrammatic plan view of the tubular film to be adhered to the bag-in-carton.
FIG. 5A is a view of the tubular film in its sealed state.
FIG. 5B is a view of the tubular film in its sealed state.
FIG. 5C is a view of the tubular film in its sealed state.
FIG. 5D is a view of the tubular film in its sealed state.
FIG. 6 is the same view of bag-in-carton according to another embodiment of the present
invention as FIG. 3.
FIG. 7A is a view of the bag-in-carton according to a second embodiment set up in
a forming step of the bag-in-carton.
FIG. 7B is a view of the bag-in-carton according to the second embodiment set up in
a forming step of the bag-in-carton.
FIG. 7C is a view of the bag-in-carton according to the second embodiment set up in
a forming step of the bag-in-carton.
FIG. 7D is a view of the bag-in-carton according to the second embodiment set up in
a forming step of the bag-in-carton.
FIG. 8A is a view of the bag-in-carton according to the second embodiment in a forming
step of the bag-in-carton in which the pouring spout is attached.
FIG. 8B is a view of the bag-in-carton according to the second embodiment in a forming
step of the bag-in-carton in which the pouring spout is attached.
FIG. 8C is a view of the bag-in-carton according to the second embodiment in a forming
step of the bag-in-carton in which the pouring spout is attached.
FIG. 8D is a view of the bag-in-carton according to the second embodiment in a forming
step of the bag-in-carton in which the pouring spout is attached.
FIG. 9A is a view of the bag-in-carton according to the second embodiment in a forming
step of the bag-in-carton in which one seal-closed end is formed.
FIG. 9B is a view of the bag-in-carton according to the second embodiment in a forming
step of the bag-in-carton in which one seal-closed end is formed.
FIG. 9C is a view of the bag-in-carton according to the second embodiment in a forming
step of the bag-in-carton in which one seal-closed end is formed.
FIG. 9D is a view of the bag-in-carton according to the second embodiment in a forming
step of the bag-in-carton in which one seal-closed end is formed.
FIG. 9E is a view of the bag-in-carton according to the second embodiment in a forming
step of the bag-in-carton in which one seal-closed end is formed.
FIG. 10A is a view of the bag-in-carton according to the second embodiment in a forming
step of the bag-in-carton in which one tight-closed end is formed.
FIG. 10B is a view of the bag-in-carton according to the second embodiment in a forming
step of the bag-in-carton in which one tight-closed end is formed.
FIG. 10C is a view of the bag-in-carton according to the second embodiment in a forming
step of the bag-in-carton in which one tight-closed end is formed.
FIG. 10D is a view of the bag-in-carton according to the second embodiment in a forming
step of the bag-in-carton in which one tight-closed end is formed.
FIG. 11A is a side sectional view of the bag-in-carton according to a third embodiment
of the present invention in its state where the bag-in-carton is filled with a content.
FIG. 11B is a side sectional view of the bag-in-carton according to the third embodiment
of the present invention in its state where the content is drawn out.
FIG. 12 is a diagrammatic perspective view of the bag-in-carton.
FIG. 13 is a diagrammatic plan view of a carton blank for the bag-in-carton, and a
tubular film.
FIG. 14 a diagrammatic perspective view of the bag-in-carton according to a fourth
embodiment of the present invention.
FIG. 15 is a diagrammatic plan view of a carton blank for the bag-in-carton, and a
tubular film.
FIG. 16 is the same view of bag-in-carton according to another embodiment of the present
invention as FIG. 15.
FIG. 17A is a view of inner-bag adhering regions of the bag-in-carton according to
further another embodiment of the present invention and shows only a side panel for
convenience.
FIG. 17B is a view of inner-bag adhering regions of the bag-in-carton according to
further another embodiment of the present invention and shows only a side panel for
convenience.
FIG. 17C is a view of inner-bag adhering regions of the bag-in-carton according to
further another embodiment of the present invention and shows only a side panel for
convenience.
FIG. 17D is a view of inner-bag adhering regions of the bag-in-carton according to
further another embodiment of the present invention and shows only a side panel for
convenience.
FIG. 17E is a view of inner-bag adhering regions of the bag-in-carton according to
further another embodiment of the present invention and shows only a side panel for
convenience.
FIG. 17F is a view of inner-bag adhering regions of the bag-in-carton according to
further another embodiment of the present invention and shows only a side panel for
convenience.
FIG. 18A is a view of inner-bag adhering regions of the bag-in-carton according to
further another embodiment of the present invention and shows only a side panel for
convenience.
FIG. 18B is a view of inner-bag adhering regions of the bag-in-carton according to
further another embodiment of the present invention and shows only a side panel for
convenience.
FIG. 18C is a view of inner-bag adhering regions of the bag-in-carton according to
further another embodiment of the present invention and shows only a side panel for
convenience.
FIG. 18D is a view of inner-bag adhering regions of the bag-in-carton according to
further another embodiment of the present invention and shows only a side panel for
convenience.
FIG. 18E is a view of inner-bag adhering regions of the bag-in-carton according to
further another embodiment of the present invention and shows only a side panel for
convenience.
FIG. 18F is a view of inner-bag adhering regions of the bag-in-carton according to
further another embodiment of the present invention and shows only a side panel for
convenience.
FIG. 19A is a view of inner-bag adhering regions of the bag-in-carton according to
further another embodiment of the present invention and shows only a side panel for
convenience.
FIG. 19B is a view of inner-bag adhering regions of the bag-in-carton according to
further another embodiment of the present invention and shows only a side panel for
convenience.
FIG. 19C is a view of inner-bag adhering regions of the bag-in-carton according to
further another embodiment of the present invention and shows only a side panel for
convenience.
PREFERRED EMBODIMENTS OF THE INVENTION
A First Embodiment
[0020] The bag-in-carton according to a first embodiment of the present invention will be
explained with reference to drawings attached hereto.
[0021] FIGs. 1 to 5 are views of the bag-in-carton according to the first embodiment of
the present invention. FIG. 1A shows the bag-in-carton according to the first embodiment
which is filled with a content, and FIG. 1B shows the bag-in-carton according to the
first embodiment with the content drawn out. FIG. 2 is a diagrammatic perspective
view of the bag-in-carton according to the first embodiment. In FIGs. 1A, 1B and 2,
the bag-in-carton 1 comprises a substantially parllelepiped box-shaped carton 2 as
an outer container, and a flexible inner bag 3 housed inside the carton 2. A content
4, such as ink, is held in the inner bag 3. The carton 2 includes an inclined panel
between two panels of the rectangular parallelepiped and comprises four flat side
panels 2a, 2b, 2c, 2d, a top and a bottom panels 2f, 2e, and the inclined panel 2g
formed between the side panel 2a and the top panel 2f.
[0022] A pouring spout 5 is attached to the inclined panel 2g of the carton 2 in communication
with the inner bag 3 and is closed by a cap 6. The pouring spout 5 has a tubular portion
5a extended in the inner bag 3 and has grooved passages 5b for passing the liquid
formed in the end part of the tubular portion 5a on the side of the inner bag 3. Because
of the passages 5b, even when, for example, the end of the tubular portion 5a in the
inner bag 3 is blocked by the inner bag 3, the content 4 can be drawn out into the
pouring spout 5 through the passages 5b. A projection height of the pouring spout
5 beyond the carton 2 is so set that the cap 6 put on the pouring spout 5 is within
a region defined by an extension of the side panel 2a and an extension of the top
panel 2f. This arrangement permits a number of the bag-in-cartons to be laid one on
another and side by side in rows and columns.
[0023] The inner bag 3 is adhered fixedly to parts of the inside surfaces of the carton
2.
[0024] That is, as shown in FIGs. 1A to 3, the inner bag 3 is adhered to the substantially
entire inside surfaces of the inclined panel (pouring spout attached panel) 2g, the
pair of the opposed side panels 2b, 2d which are adjacent to the inclined panel 2g
and the side panel 2a adjacent to the lower edge of the inclined panel 2g. The inner
bag 3 may be adhered to the substantially entire inside surfaces of the inclined panel
2g and the side panel 2a at spots by an adhesive. The inner bag 3 is adhered to the
four corners of the side panel 2c of the panels which are not adjacent to but remote
from the inclined panel 2g. FIG. 2 shows the inner-bag adhering regions 9. FIG. 3
shows a carton blank 2' for the carton. In FIG. 3, the cross-hatched region of the
inner-bag adhering regions 9 is a non-releasable region 9a, and the parallel hatched
regions of the inner-bag adhering regions 9 are releasable regions 9b.
[0025] The inner bag 3 is thus adhered to the substantially entire inside surfaces of the
inclined panel 2g, a pair of the side panels 2b, 2d and the side panel 2a below the
inclined panel 2g, and partially to the inside surface of the side panel 2c, whereby
the inner bag 3 can be firmly fixed in the carton 2. The inner bag 3 is adhered to
the inside surfaces of the carton 2 by a releasable adhesive. As a result, as the
content is discharged and decreased, the inner bag 3 is shrunk and easily released
from the carton 2.
[0026] The inner bag 3 is spot-adhered to the inside surface of the side panel 2c at inner-bag
adhered regions 9 provided on the four corners thereof. When the content 4 is discharged
through the pouring spout 5, the inner bag 3 is gradually deformed to move toward
the pouring spout 5. At this time, the inner bag 3 is released first from the side
panel 2c, which is remote from the pouring spout 5, and the spot-adhesion of the inner
bag 3 to the inside surface of the side panel 2c facilitates easy release of the inner
bag 3 off the side panel 2c. The inner-bag adhering regions 9 on the side panel 2c
may be square as shown in FIG. 2 or rectangular.
[0027] Then, a method for forming the bag-in-carton 1 having the above-described structure
will be explained. First, a cardboard is punched in a prescribed shape as shown in
FIG. 3 to prepare a carton blank 2' having panels 2a'-2h' to be set up into the carton.
The inner-bag adhering regions 9 are formed on the inside surface of the panels 2a',
2b', 2c', 2d', 2g' (which are to be the side panels 2a, 2b, 2c, 2d and the inclined
panel 2g). While the carton blank 2' is being formed, as shown in FIG. 4, a sheet
film is folded into a tubular shape and back-sealed at end portions to form a back
sealed portion 16. The folded film is cut into tubular films 3' of a required length
(whose top and bottom ends will be sealed in a later step into the inner bags).
[0028] Then, an adhesive, e.g., an emulsion-type adhesive, as of vinyl acetate group, acryl
copolymer group, vinyl acetate-acryl copolymer group, modified ester acrylate copolymer
group, etc., is applied to the inner-bag adhering regions 9 which are formed on the
substantially entire inside surfaces of the panels 2a', 2b', 2d' and 2g' of the carton
blank 2'. The adhesive is applied to the inner-bag adhering regions 9 formed partially
on the side panel 2c' and a glue margin 2h' of the carton blank 2'. A glue margin
2i' of the carton blank 2' is folded inside when the carton blank 2' is set up, and
a hot-melt adhesive, as of ethylene-vinyl acetate copolymer group, polyvinyl acetate
group, polyamide group, polyethylene group, styrene-butadiene copolymer group, styrene-isobutylene
copolymer group, polyisobutylene group, polyester group, etc., is also applied to
the glue margin 2i'. The emulsion-type adhesive is also applied to the back surface
of the glue margin 2h'.
[0029] Then, as shown in FIG. 3, the tubular film 3' is adhered to the panels 2a', 2d',
2g' of the carton blank 2' by means of an adhesive. The tubular film 3' is so arranged
that the back-sealed portion 16 is in abutment on the side panel 2c and is opposed
to the pouring spout 5 when the carton blank 2' is set up. Then, the side panels 2b',
2c' are folded on the tubular film 3' and barrel-sealed. The panels 2b', 2c' and the
glue margin are adhered to the tubular film 3', and the panels 2b' are adhered. Thus
flat bag-in-carton before set up is formed.
[0030] Then, the flat bag-in-carton 1 is fed to the setting-up step portion and the loading
step portion, and is set up there into a rectangular parallelepiped and completed.
Then, a pouring spout attached portion 15 (FIG. 3) of the carton blank 27 is punched,
and the pouring spout 5 is attached. Then, the upper end of the tubular film 3' is
seal-closed.
[0031] This seal closing operation is conducted as shown in FIGs. 5A to 5D (in FIGs. 5A
to 5D the carton is shown simplified for easy understanding). That is, as shown in
FIG. 5A, the end of the tubular film 3' opened in a rectangular parallelepiped is
closed as shown in FIG. 5B, and the end is sealed horizontally to form a first seal
10. Then, the first seal 10 is pressed flat as shown in FIG. 5C to form triangular
flaps 11 on both sides. The bottom sides of the triangular flaps 11 are sealed to
form second seals 12, and the triangular flaps 11 are folded inward as shown in FIG.
5D, whereby the tubular film 3' is set up with the end of the tubular film 3' are
sealed. Because of the second seals 12 on the bottom sides of the triangular flaps
11, the inner bag 3 is free from its content entering the triangular flaps 11 and
trapped there with a result that a large amount of the content resides. The second
seals 12 have reinforcing effect, and also functions to retain the inner bag 3 substantially
rectangular parallelepiped. It is possible to deform entirely the inner bag 3 in good
shape when a content is drawn out.
[0032] After the tubular film 3' is set up with the upper end of the tubular film 3' sealed,
the top of the carton blank 2' is set up.
[0033] Then, the lower end of the tubular film 3' is sealed in the same way as the upper
end thereof, and then the bottom of the carton blank 2' is set up. And the bag-in-carton
1 accommodating the inner bag 3 in the carton 2 is set up. This process can be conducted
by the conventional bag-in-carton forming technique, and the forming equipments, etc.
are not explained. Finally a content 4, such as ink or others, is loaded in the bag-in-carton
1, and the bag-in-carton 1 has the state shown in FIG. 1A.
[0034] In using the bag-in-carton filled with a content 4, as shown in FIGs. 1A and 1B,
the bag-in-carton is set on a machine, such as a printing machine or others, with
the pouring spout directed downward, and the pouring spout is connected to a connector
(not shown) of drawing means belonging to the machine. The content 4 is drawn and
discharged through the pouring spout 5. At this time, the inner bag 3 starts being
released from the inner-bag adhering regions 9 on the side panel 2c, which are spot-adhesions,
and then from the pair of opposed side panels 2b, 2d. As the content 4 is drawn, the
released parts of the inner bag 2 is deformed as shown by the two-dot lines 21a, 21b
in FIG. 1B and is displaced to the pouring spout 5, whereby the content 4 can be discharged
in a stably constant amount without letting air into the inner bag 3. Finally the
released part of the inner bag 3 is withdrawn into the unreleasable part thereof,
which is fixed to the inside surfaces of the carton 2 and are substantially a rest
half of the inner bag 3, and almost all the content is discharged.
[0035] Next, the adhesive strength of the releasable part 9a and the unreleasable part 9a
will be explained.
[0036] Adhesive strengths of the releasable part 9b and the unreleasable part 9a are substantially
as follows.
[0037] An adhesive strength (a force (gf) 15 mm-width samples required to be released when
subjected to a tensile test at the room temperature) is
a strength of the unreleasable part 9a at the start of the release: about 4.6 N
(470 gf)
an adhesive strength of the releasable part 9b: about 2.1 N (210 gf).
[0038] It is preferable that the unreleasable part 9a has a higher adhesive strength than
that of the releasable part 9b.
[0039] As described above, according to the present embodiment, when the content 4 is drawn
out through the pouring spout 5, the inner bag 3 starts being released first from
the inner-bag adhering regions 9, to which the inner bag 3 is spot adhered, and then
from the inside surfaces of the one pair of the side panels 2b, 2d, and is gradually
deformed and displaced to the pouring spout 5. Then, the released part of the inner
bag 3 is withdrawn into the unreleasable part thereof, whereby substantially all the
content 4 can be drawn out through the pouring spout 5.
[0040] The inner bag 3 is gradually released from the inside surfaces of the carton 2 as
the content 4 is decreased, whereby the inner bag 3 is kept from being excessively
released to adversely contact tightly the unreleasable part thereof, confining the
content 4.
[0041] The pouring spout 5 is located substantially at the center of the inclined panel
2g. The back sealed portion 16 on the inner bag 3 is located at a position where the
portion 16 abuts on the side panel 2c, and is opposed to the pouring spout 5, i.e.,
is located substantially at the center of the side panel 2c. This arrangement enables
the content 4 of the inner bag 3 to be driven to the pouring spout without failure
when the inner bag 3 is deformed, displaced to the pouring spout 5 as the content
4 is drawn out.
[0042] That is, the back sealed portion 16 of the inner bag 3, which is harder than the
rest part of the inner bag 3, tends to hinder the deformation when the inner bag 3
is deformed. Accordingly in a case where the back sealed portion 16 abuts on, e.g.,
the side panel 2b, which is adjacent to the inclined panel 2g (the pouring spout attached
panel), the back sealed portion 16 hinders the deformation of the inner bag 3 as a
result the inner bag 3 may be deformed horizontally unsymmetrically with respect to
the pouring spout 5.
[0043] According to the present invention, because the back sealed portion 16 is located
opposed to the pouring spout 5, the inner bag 3 can be deformed horizontally symmetrically
with respect to the pouring spout 5 as the center, whereby the content 4 of the inner
bag 3 can be smoothly sent out to the pouring spout without unsymmetrical deformation.
[0044] Next, another embodiment of the present invention will be explained with reference
to FIG. 6. The embodiment shown in FIG. 6 is substantially the same as the embodiment
shown in FIGs. 1A to 5D except that the inner-bag adhering regions have different
shapes from those of the embodiment shown in FIGs. 1A to 5D.
[0045] As shown in FIG. 6, on the panels 2b', 2d' (which are to be a pair of side panels
2b, 2d) of a carton blank 2', inner-bag adhering regions 9 have concavities 23a and
convexities 23b on the boundaries, and the boundaries of the inner-bag adhering regions
9 on the panels 2b', 2d' are concave and convex.
[0046] It is preferred that the convexities and concavities 23a, 23b of the inner-bag adhering
regions 9 on the panels 2b', 2d' are formed in parts which are remotest from a pouring
spout 5. When the content 4 is drawn out through the pouring spout 5, the inner bag
3 starts being released from the parts of the pair of side panels 2b, 2d which are
remotest from the pouring spout 6, and the concavities and convexities 23a, 23b formed
in the remotest parts of the inner-bag adhering regions 9 from the pouring spout 5
enables the inner bag 3 to smoothly start the release.
[0047] In the above-described embodiments, the pouring spout 5 has the cylindrical portion
5a extended in the inner bag 3, but the pouring spout 5 is not limited to this structure.
The pouring spout 5 may be a usual one without the cylindrical portion 5a. It is possible
that a suitable passage member (e.g., a rod-shaped member or others of H-shaped section)
which can ensure a passage for a content to pass through when the releasable part
of the inner bag 3 is withdrawn into the unreleasable part thereof is provided in
the bottom of the inner bag 3.
[0048] In taking out the content 4, the case that the bag-in-carton 1 is set on a machine
with the pouring spout 5 faced downward has been explained, but the state is not essential.
Depending on machines, the bag-in-carton 1 may be set suitably with the pouring spout
5 faced upward or sidewise. By setting the bag-in-carton 1 on a machine with the pouring
spout 5 faced upward, run of the content from the pouring spout 5 can be prevented.
[0049] As described above, according to the present invention, the inner bag 3 can be firmly
fixed inside the carton 2 before the content 4 is drawn out, and as the content 4
is drawn out, the inner bag 3 can be released from the inside surfaces of the carton
to be deformed to the pouring spout 5. The releasable part of the inner bag 3 is withdrawn
into the unreleasable part thereof, whereby substantially all the content 4 can be
drawn out through the pouring spout 5 without failure. The inner bag 3 is gradually
released from the inside surfaces of the carton 2, whereby the releasable part of
the inner bag 3 is brought into tight contact with the unreleasable part thereof,
confining the content.
A Second Embodiment
[0050] A second embodiment of the present invention will be explained with reference to
the drawings.
[0051] FIGs. 7A to 10D show the second embodiment. The bag-in-carton according to the second
embodiment is substantially the same as the bag-in-carton according to the first embodiment
shown in FIGS. 1A to 3, and the same members are represented by the same reference
numerals to omit their detailed description.
[0052] Then, a method for forming the bag-in-carton according to the second embodiment will
be explained with reference to FIGs. 3, 4 and FIGs. 7A to 10D. First, as shown in
FIG. 3, a cardboard is punched into a required shape to prepare a carton blank 2'
to be set up into a carton 2. Inner-bag adhering regions 9 are provided on the inside
surfaces of panels 2a', 2b', 2c', 2d', 2g' of the carton blank 2' (which are to be
side panels 2a, 2b, 2c, 2d and the inclined panel 2g of the carton 2). While the carton
blank 2' is being formed, as shown in FIG. 4, a sheet film is folded into a tubular
shape and back-sealed at end portions to form a back-sealed portion 16. The folded
film is cut into a tubular film 3' of a required length (whose top and bottom ends
will be sealed in a later step into the inner bag).
[0053] Then, an adhesive, e.g., an emulsion-type adhesive, as of vinyl acetate group, acryl
copolymer group, vinyl acetate-acryl copolymer group, modified ester acrylate copolymer
group, etc., is applied to the inner-bag adhering regions 9 which are formed on the
substantially entire inside surfaces of the panels 2a', 2b', 2d' and 2g' of the carton
blank 2'. The adhesive is applied to the inner-bag adhering regions 9 formed partially
on the side panel 2c' and a glue margin 2h' of the carton blank 2'. A glue margin
2i' of the carton blank 2' is folded inside when the carton blank 2' is set up, and
a hot-melt adhesive, as of ethylene-vinyl acetate copolymer group, polyvinyl acetate
group, polyamide group, polyethylene group, styrene-butadiene copolymer group, styrene-isobutylene
copolymer group, polyisobutylene group, polyester group, etc., is also applied to
the glue margin 2h'. The emulsion-type adhesive is also applied to the back surface
of the glue margin 2h'.
[0054] Then, as shown in FIG. 3, the tubular film 3' is adhered to the panels 2a', 2d',
2g' of the carton blank 2' by means of an adhesive. The tubular film 3' is so arranged
that the back-sealed portion 16 is in abutment on the side panel 2c and is opposed
to the pouring spout 5 when the carton blank 2' is set up. Then, the side panels 2b',
2c' are folded on the tubular film 3' and body-sealed. The panels 2b', 2c' and the
glue margin are adhered to the tubular film 3', and the panels 2b' are adhered. Thus
flat bag-in-carton before set up is formed. Then, the flat bag-in-carton 1 is sent
to the setting up and charging step portion to be set up and charged with a content.
The bag-in-carton setting up step will be explained with reference to FIGs. 7A to
10D.
[0055] First as shown in FIG. 7A, the bag-in-carton 1 is set up into a rectangular parallelepiped
one, supported by a support 27. At this time, openings are formed on both sides of
the bag-in-carton 1 (both the upper and the lower sides), and openings are formed
in both sides of the inner bag 3. In FIG. 7A, the carton 2 has a plurality of side
panels 24 on one side opening and a plurality of side panels 25 on the other side
opening.
[0056] Then, as shown in FIG. 7B, a pair of arms 28 is lowered through the upper opening
(one side opening) of the carton 2. Then, the pair of arms 28 is advanced into the
inner bag 3 to expand the inner bag 3. Next, the other side panels 25 are expanded
by arms not shown (FIG. 7C).
[0057] Next, as shown in FIG. 7D, a female die 29 is lowered through the one side opening
of the carton 2 and is advanced into the inner bag 3. Then, a male die 30 is brought
near the female die 29, and a pouring spout attached portion 15 (see FIG. 3) is punched
between the female die 29 and the male die 30 in an inclined panel 2g of the carton
2.
[0058] Then, as shown in FIG. 8A, photoelectric tube 31 is brought near the punched pouring
spout portion 15 to detect whether or not the pouring spout portion 15 has been punched.
Next, as shown in FIG. 8B, a pouring spout holding unit 32 holding a pouring spout
5 is lowered into the inner bag 3 through the one side opening and is further moved
to the pouring spout attached portion 15 to mount the pouring spout 5.
[0059] Next, as shown in FIG. 8C, it is detected by the photoelectric tube 33 whether or
not the pouring spout 5 has been attached. Next, as shown in FIG. 8D, a supersonic
wave oscillator 34 is brought near to the pouring spout 5. Simultaneously therewith
a supersonic wave receiver 35 is lowered into the inner bag 3 through the one side
opening of the carton 2. In this state, supersonic waves are outputted by the supersonic
wave oscillator 34 to supersonic wave-seal the pouring spout 5 to the inside surface
of the inner bag 3 to be secured o the carton 2.
[0060] Then, as shown in FIG. 9A, a pair of arms 41 is lowered through one side opening
of the carton 2 and is advanced into the inner bag 3 to expand the inner bag 3. Simultaneously
therewith, a pawl unit 42 is brought near the carton 2 to expand the respective panels
24 on one side of the carton 2.
[0061] Then, as shown in FIG. 9B, a pair of seal arms 44 is lowered through one side opening
of the carton 2 and is advanced into the inner bag 3 to expand one side opening thereof.
Simultaneously therewith, a pair of press levers 46 and a pair of seal bars 47 as
shown in FIG. 9E are brought near one end opening of the inner bag 3, and one end
opening of the inner bag 3 expanded by the pair of seal arms 44 is pressed first by
the pair of press bars 46. Next, the pair of seal bars 47 seal one end opening of
the inner bag 3. A first sealed portion 10 is formed in one end opening of the inner
bag 3. FIG. 9E shows the inner bag as viewed in the direction of the arrow E in FIG.
9B.
[0062] Next,, as shown in FIG. 9C, the first sealed portion 10 formed in one end opening
of the inner bag 3 is cooled by a cooling bar (not shown). Then, as shown in FIG.
9D, a holding plate 48 having a pair of side plates is disposed on the upper surface
of the first sealed portion 10.
[0063] Then, a pair of presser plates 49, 49 are pressed against the pair of side plates
to press a pair of triangular flaps formed on one side of the inner bag 3. Air in
the triangular flaps 11 is thus exhausted.
[0064] Next, as shown in FIG. 10A, a pair of seal bars 51 are brought near the triangular
flaps 11, and then bottoms of the triangular flaps 11 are sealed by the seal bars
51 to form second sealed portions 12 which are perpendicular to the first sealed portions
10. Thus, one side seal-closed portion 3a of the inner bag 3 is formed at one end
of the inner bag 3.
[0065] Next, as shown in FIG. 10B, the pair of triangular flaps 11 and the respective panels
24 on one side of the inner bag 3 are sequentially folded, and the respective panels
24 are adhered and the shape thereof is formed between the presser plate 54 disposed
above the carton 2 and a forming carrier 53 advanced into the inner bag 3 through
the lower opening (the other end opening).
[0066] Then, as shown in FIG. 10C, all the panels 24 on one end are folded, and one end
of the carton 2 is adhered and the shape thereof is formed between a presser plate
56 disposed above the carton 26 and a forcing carrier 55 advanced into the carton
2 through the other end opening. The one end of the carton 2 is thus tight closed
to form one side closed portion. In this case, the one side closed portion of the
carton 2 has a top panel 2f, and an inclined panel 2g which is inclined to the top
panel 2f and having the pouring spout 5 attached to.
[0067] Next, as shown in FIG. 10D, a presser plate 58 is disposed above the one side closed
portion of the carton 2. On the other hand, a forming jig 57 having a top panel presser
surface 57f corresponding to the top panel 2f, and an inclined panel presser surface
57f corresponding to the inclined panel 2g is advanced into the inner bag 3 sequentially
through the other end opening of the carton 2 and then through the other end opening
of the inner bag 3. In this state, the forming jig 57 presses the one side seal-closed
end 3a of the inner bag 3 closed by the first and the second sealed portions 10, 12
against the one side closed portion of the carton 2. A pressing force of the forming
jig 57 at this time is born by the presser plate 58.
[0068] By thus pressing the one side seal-closed portion 3a of the inner bag 3 against the
one side seal-closed portion of the carton 2 by the forming jig 57, the one side seal-closed
portion 3a of the inner bag 3 can formed in a uniform, constantly stable shape in
accordance with a shape of the one side closed portion (corresponding to the top panel
2f and the inclined panel 2g).
[0069] Generally only sealing one end of the flexible inner bag 3 and accommodating the
one side seal-closed portion 3a of the inner bag 3 in the carton 2 adversely permits
the one seal-closed portion 3a to take various shapes with a result that the inner
bag 3 have various capacities.
[0070] Unless the inner 3 bag is accommodated in a constantly stable shape, after a content
of the inner bag 3 is discharged, the inner bag 3 has much residue of the content.
As a result, the inner bag 3 adversely has various volumes.
[0071] In the present invention, the one side seal-closed portion 3a of the inner bag 3
is formed by the forming jig 57 in accordance with a shape of the one side closed
portion 2f, 2g of the carton 2, whereby the one side seal-closed portion 3a of the
inner bag 3 can be formed with good precision, and accordingly the inner bag 3 can
have a constant volume. On the other hand, the inner bag 3 is accommodated in a regular,
constantly stable shape, whereby the inner bag can have less residual content. Accordingly
a certain amount of content can be held in the inner bag with good precision. Furthermore,
the pouring spout 5 is attached to the inclined panel 2g of the carton 2, and the
part of the one side seal-closed portion 3a of the inner bag 3 corresponding to the
inclined panel 2g of the carton 2 can be formed in a uniform, constantly stable shape
in accordance with a shape of the inclined panel 2g by the inclined presser plate
57g of the forming jig 57. Next, the other end opening of the inner bag 3 is sealed
in the same way as the seal-closed portion 3a, and the other side seal-closed portion
(having the same structure as the one side seal-closed portion 3a) is formed, and
then the other end of the carton 2 is tight-closed to form the other side closed portion
2e. The bag-in-carton 1 comprising the carton 2 accommodating the inner bag therein
is thus set up.
[0072] These steps can be carried out by the conventional bag-in-carton forming technique,
and the detailed description of the forming equipment is omitted. Finally a content,
the bag-in-carton 1 is charged with a content, such as ink, and has a state shown
in FIG. 1A.
[0073] In using the bag-in-carton filled with a content 4, as shown in FIGs. 1A and B, the
bag-in-carton is set on a machine, such as a printing machine or others, with the
pouring spout directed downward, and the pouring spout is connected to a connector
(not shown) of drawing means belonging to the machine. The content 4 is drawn and
discharged through the pouring spout 5. At this time, the inner bag 3 starts being
released from the inner-bag adhering regions 9 on the side panel 2c, which are spot-adhesions,
and then from the pair of opposed side panels 2b, 2d. As the content 4 is drawn, the
released parts of the inner bag 2 is deformed as shown by the two-dot lines 21a, 21b
in FIG. 1B and is displaced to the pouring spout 5, whereby the content 4 can be discharged
without letting air into the inner bag 3. Finally the released part of the inner bag
3 is withdrawn into the unreleasable part thereof, which is fixed to the inside surfaces
of the carton 2 and are substantially a rest half of the inner bag 3, and almost all
the content is discharged.
[0074] Next, the adhesive strength of the releasable part 9a and the unreleasable part 9a
will be explained.
[0075] Adhesive strengths of the releasable part 9b and the unreleasable part 9a are substantially
as follows.
[0076] An adhesive strength (a force (gf) 15 mm-width samples required to be released when
subjected to a tensile test at the room temperature) is
a strength of the unreleasable part 9a at the start of the release: about 4.6 N
(470 gf)
an adhesive strength of the releasable part 9b about 2.1 N (210 gf).
[0077] It is preferable that the unreleasable part 9a has a higher adhesive strength than
that of the releasable part 9b.
[0078] As described above, according to the present embodiment, the one side seal-closed
portion 3a of the inner bag 3 is formed by means of the forming jig 57 having the
top panel presser surface 57f and the inclined panel presser surface 57g in accordance
with a shape of the one side closed portion defined by the inclined panel 2g and the
top panel 2f, whereby the one side seal-closed portion 3a of the inner bag 3 can be
formed with high precision, and accordingly the inner bag 3 can have a constant volume.
Because of the second sealed portion 12 provided on the proximal ends of the triangular
flaps 11, which are normal thereto, the content is prevented from being confined in
the triangular flaps 11, without a result that more of the content resides. The second
sealed-portion 12 has a function of reinforcement, whereby the inner bag 3 can be
retained substantially rectangular parallelepiped. When a content is drawn out, the
inner bag can be generally deformed in good shape.
[0079] In the above-described embodiments, the pouring spout 5 has the cylindrical portion
5a extended in the inner bag 3, but the pouring spout 5 is not limited to this structure.
The pouring spout 5 may be a usual one without the cylindrical portion 5a. It is possible
that a suitable passage member (e.g., a rod-shaped member or others of H-shaped section)
which can ensure a passage for a content to pass through when the releasable part
of the inner bag 3 is withdrawn into the unreleasable part thereof is provided in
the bottom of the inner bag 3.
[0080] In taking out the content 4, the case that the bag-in-carton 1 is set on a machine
with the pouring spout 5 faced downward has been explained, but the state is not essential.
Depending on machines, the bag-in-carton 1 may be set suitably with the pouring spout
5 faced upward or sidewise. By setting the bag-in-carton 1 on a machine with the pouring
spout 5 faced upward, run of the content from the pouring spout 5 can be prevented.
[0081] Furthermore, the inner bag 3 can be accommodated in a constantly stable shape, whereby
less of the content resides after discharged.
[0082] According to the present invention, the one side seal-closed portion 3a of the inner
bag 3 can be formed by the forming jig 57 in accordance with the one side closed portion
defined by the top panel 2f and the inclined panel 2g of the carton 2, whereby the
inner bag 3 can have a substantially constant volume with high precision.
[0083] The inner bag 3 can be accommodated constantly stable. When the content 4 is drawn
out, the inner bag 3 can be generally deformed in good shape, and less of the content
resides.
A Third Embodiment
[0084] Next, a third embodiment of the present invention will be explained with reference
to the drawings.
[0085] FIGs. 11A to 13 show the bag-in-carton according to the third embodiment of the present
invention. FIG. 11 shows the bag-in-carton in a state where the bag-in-carton is filled
with a content, and FIG. 11B shows the bag-in-carton in a state where the content
is drawn out. FIG. 12 is a diagrammatic perspective view of the bag-in-carton. In
FIGs. 11A, 11B and 12, the bag-in-carton 1 comprises a substantially rectangular parallelepiped
box-shaped carton 2 which provides an outer container, and a flexible inner bag 3
accommodated in the outer container. The inner bag 3 holds a liquid content 4, such
as ink or others. The carton 2 has an inclined panel between two adjacent panels of
the rectangular parallelepiped, and has four flat side panels 2a, 2b, 2c, 2d, a top
and a bottom panels 2e, 2f, and the inclined panels 2g formed between the side panels
2f, 2a.
[0086] A pouring spout 5 is attached to the inclined panel 2g of the carton 2 in communication
with the inner bag 3, and the pouring spout 5 is closed with a cap 6. The pouring
spout 5 has a tubular portion 5a which is extended into the inner bag through the
inclined panel 2g and the inner bag 3, and has grooved passages 5b for passing the
liquid formed in the end part of the tubular portion 5a on the side of the inner bag
3. Because of the passages 5b, even when, for example, the end of the tubular portion
5a in the inner bag 3 is blocked by the inner bag 3, the content 4 can be drawn out
into the pouring spout 5 through the passages 5b. A projection height of the pouring
spout 5 beyond the carton 2 is so set that the cap 6 put on the pouring spout 5 is
within a region defined by an extension of the side panel 2a and an extension of the
top panel 2f. This arrangement permits a number of the bag-in- cartons to be laid
one on another and side by side in rows and columns.
[0087] The inner bag 3 is adhered fixedly to parts of the inside surfaces of the carton
2.
[0088] That is, as shown in FIGs. 11A to 13, the inner bag 3 is adhered to the substantially
entire inside surfaces of the inclined panel (pouring spout attached panel) 2g, the
pair of the opposed side panels 2b, 2d which are adjacent to the inclined panel 2g
and the side panel 2a adjacent to the lower edge of the inclined panel 2g. The inner
bag 3 may be adhered to the substantially entire inside surfaces of the inclined panel
2g and the side panel 2a at spots by an adhesive.
[0089] As shown in FIGs. 12 and 13, the inner bag 3 is also adhered to the regions of one
pair of the side panels 2b, 2d opposed to each other and adjacent to the inclined
panel 2g, which (regions) exclude strips 18. The strips 18 on the pair of the side
panels 2b, 2d are regions formed substantially at the middle of a straight line 21
(see FIGs. 11A and 11B) interconnecting the pouring spout 5 and the remotest end part
20 of the carton 2, which is remotest from the pouring spout 5 and are formed substantially
normal to the straight line 21. The strips 18 thus formed on the pair of the side
panels 2b, 2d permit the inner bag 3 to start being released at the side of the remotest
end part 20 on the pair of the side panels 2b, 2d as will be described later, when
the inner bag 3 is released from the inside surfaces of the carton 2 and finish the
release.
[0090] The inner bag 3 is also adhered partially (to the four corners) to the side panel
2c of the side panels which are not adjacent to the inclined panel 2g but remote from
the same. FIG. 12 shows the inner-bag adhering regions 9. FIG. 13 shows a carton blank
2' for forming the carton. In FIGs. 12 and 13, parts of the inner-bag adhering regions
9 on the pair of side panels 2b, 2d, which are on the upper side of the strips 18
and are nearer to the pouring spout 5 are unreleasable regions 9a, and the rest parts
are releasable regions 9b. The inner-bag adhering region on the side panel 2c is a
releasable region 9b.
[0091] As described above, the inner bag 3 is adhered to all the inside surface of the inclined
panel 2g and substantially all the entire inside surface of the side panel 2a below
the inclined panel 2g, to the inside surfaces of the pair of side panels 2b, 2d except
the strips 18, and partially to the inside surface of the side panel 2c, whereby the
inner bag 3 can be firmly fixed inside the carton 2. The inner bag 3 is adhered to
the carton 2 releasably by an adhesive. Accordingly as the content 4 is decreased,
the inner bag 3 can be readily released from the carton 2, withdrawn into itself.
[0092] When the content 4 is discharged through the pouring spout 5, the inner bag 3 is
gradually deformed and moved to the pouring spout 5. At this time, the inner bag 3
starts being released first from the side panel 2c. The spot adhesion of the inner
bag 3 to the side panel 2c allows the inner bag 3 to be readily released from the
side panel 2c. The inner-bag adhering region 9 of the inner bag 3 to the inside surface
of the side panel 2c may be square or rectangular.
[0093] Then, a method for forming the bag-in-carton 1 having the above-described structure
will be explained. First, a cardboard is punched in a prescribed shape as shown in
FIG. 13 to prepare a carton blank 2' to be set up into the carton. The inner-bag adhering
regions 9 are formed on the inside surface of the panels 2a', 2b', 2c', 2d', 2g' of
the carton blank 2' (which are to be the side panels 2a, 2b, 2c, 2d and the inclined
panel 2g). While the carton blank 2' is being formed, as shown in FIG. 4, a sheet
film is folded into a tubular shape and back-sealed at end portions to form a back-sealed
portion 16. The folded film is cut into a tubular film 3' of a required length (whose
top and bottom ends will be sealed in a later step into the inner bags).
[0094] Then, an adhesive, e.g., an emulsion-type adhesive, as of vinyl acetate group, acryl
copolymer group, vinyl acetate-acryl copolymer group, modified ester acrylate copolymer
group, etc., is applied to the inner-bag adhering regions 9 which are formed on the
substantially entire inside surfaces of the panels 2a', 2b', 2d' and 2g' of the carton
blank 2'. The adhesive is applied to the inner-bag adhering regions 9 formed partially
on the side panel 2c' and a glue margin of the carton blank 2'. The glue margin 2h'
is a part forming the side panel 2b of the carton 2 and has an inner-bag adhering
region 9 including the unreleasable region 9a and the releasable region 9b formed
on both sides of the strip 19. The emulsion-type adhesive is also applied to the back
surface of the glue margin 2h'.
[0095] The glue margin 2i' of the carton blank 2' is folded inside when the carton blank
2' is set up into the carton 2. A hot-melt adhesive, as of ethylene-vinyl acetate
copolymer group, polyvinyl acetate group, polyamide group, polyethylene group, styrene-butadiene
copolymer group, styrene-isobutylene copolymer group, polyisobutylene group, polyester
group, etc., is also applied to the glue margin 2i'.
[0096] Then, as shown in FIG. 13, the tubular film 3' is adhered to the panels 2a', 2d',
2g' of the carton blank 2' by means of an adhesive. The tubular film 3' is so arranged
that the back-sealed portion 16 is in abutment on the side panel 2c and is to be opposed
to the pouring spout 5 when the carton blank 2' is set up. Then, the side panels 2b',
2c' are folded on the tubular film 3' and body-sealed. The panels 2b', 2c' and the
glue margin 2h' are adhered to the tubular film 3', and the panels 2b' are adhered.
Thus flat bag-in-carton before set up is formed.
[0097] Then, the flat bag-in-carton 1 is fed to the setting-up step portion and the loading
step portion, and is set up there into a rectangular parallelepiped and completed.
Then, a pouring spout attached portion 15 (FIG. 13) of the carton blank 2' is punched,
and the pouring spout 5 is attached. Then, the upper end of the tubular film 3' is
seal-closed.
[0098] After the carton blank is set up with the upper end of the tubular film 3' sealed,
the top of the carton blank 2 is set up.
[0099] Then, the lower end of the tubular film 3' is sealed in the same way as the upper
end thereof, and then the bottom of the carton blank 2' is set up. And the bag-in-carton
1 accommodating the inner bag 3 in the carton 2 is set up. This process can be conducted
by the conventional bag-in-carton forming technique, and the forming equipments, etc.
are not explained. Finally a content 4, such as ink or others, is loaded in the bag-in-carton
1, and the bag-in-carton 1 has the state shown in FIG. 11A.
[0100] In using the bag-in-carton filled with a content 4, as shown in FIGs. 11A and 11B,
the bag-in-carton is set on a machine, such as a printing machine or others, with
the pouring spout directed downward, and the pouring spout is connected to a connector
(not shown) of drawing means belonging to the machine. The content 4 is drawn and
discharged through the pouring spout 5. At this time, the inner bag 3 starts being
released from the inner-bag adhering regions 9 on the side panel 2c, which are spot-adhesions,
and then from the pair of opposed side panels 2b, 2d. As the content 4 is drawn out,
the releasable part of the inner bag 2 is deformed as indicated by the two-dot lines
21a, 21b in FIG. 11B and is moved along the straight line 21 interconnecting the pouring
spout 5 and the remotest end part 20, whereby the content 4 can be discharged in a
constant discharge amount without letting air in the inner bag 3. Finally the released
part of the inner bag 3 is withdrawn into the rest half unreleasable part of the inner
bag 3, and substantially all the content is discharged.
[0101] At this time, on the pair of side panels 2b, 2d, the inner bag 3 starts being released
on the side of the remotest end part of the carton 2, and the end of the release of
the inner bag 3 can be exactly determined by the strips 18 formed substantially crossing
the straight line 21 at the substantial middle thereof, whereby the inner gab can
be uniformly deformed. Accordingly the content of the inner bag 3 can be supplied
stably in a constant amount.
[0102] Next, the adhesive strength of the releasable part 9a and the unreleasable part 9a
will be explained.
[0103] Adhesive strengths of the releasable part 9b and the unreleasable part 9a are substantially
as follows.
[0104] An adhesive strength (a force (gf) 15 mm-width samples required to be released when
subjected to a tensile test at the room temperature) is
a strength of the unreleasable part 9a at the start of the release: about 4.6 N
(470 gf)
an adhesive strength of the releasable part 9b: about 2.1 N (210 gf).
[0105] It is preferable that the unreleasable part 9a has a higher adhesive strength than
that of the releasable part 9b.
[0106] As described above, according to the present embodiment, when the content 4 is drawn
out through the pouring spout 5, the inner bag 3 starts being released first from
the inner-bag adhering regions 9, to which the inner bag 3 is spot adhered, and then
from the inside surfaces of the one pair of the side panels 2b, 2d, and is gradually
deformed and displaced to the pouring spout 5. Then, the released part of the inner
bag 3 is withdrawn into the unreleasable part thereof, whereby substantially all the
content 4 can be drawn out through the pouring spout 5. At this time, on the pair
of side panels 2b, 2d, the release of the inner bag 3 can be stopped at the strips
18, whereby the inner bag 3 can be uniformly deformed, and accordingly the content
4 of the inner bag can be fed in a stably constant amount.
[0107] The back sealed portion 16 formed on the inner bag 3 is in abutment on the side panel
2c and is opposed to the pouring spout 5. Accordingly as the content 4 is drawn out,
the inner bag 3 is deformed and moved to the pouring spout 5, whereby the content
4 of the inner bag 3 is discharged to the pouring spout 4 without failure.
[0108] That is, the back sealed portion 16 of the inner bag 3, which is harder than the
rest part of the inner bag 3, tends to hinder the deformation when the inner bag 3
is deformed. Accordingly in a case that the back sealed portion 16 abuts on, e.g.,
the side panel 2b, which is adjacent to the inclined panel 2g (the pouring spout attached
panel), the back sealed portion 16 hinders the deformation of the inner bag 3 with
a possible result that the inner bag 3 may be deformed horizontally unsymmetrically
with respect to the pouring spout 5.
[0109] According to the present invention, because the back sealed portion 16 is located
opposed to the pouring spout 5, the inner bag 3 can be deformed horizontally symmetrically
with respect to the pouring spout 5 as the center, whereby the content 4 of the inner
bag 3 can be smoothly sent out to the pouring spout without unsymmetrical deformation.
[0110] In the above-described embodiments, the pouring spout 5 has the cylindrical portion
5a extended in the inner bag 3, but the pouring spout 5 is not limited to this structure.
The pouring spout 5 may be a usual one without the cylindrical portion 5a. It is possible
that a suitable passage member (e.g., a rod-shaped member or others of H-shaped section)
which can ensure a passage for a content to pass through when the releasable part
of the inner bag 3 is withdrawn into the unreleasable part thereof is provided in
the bottom of the inner bag 3.
[0111] In taking out the content 4, the case that the bag-in-carton 1 is set on a machine
with the pouring spout 5 faced downward has been explained, but the state is not essential.
Depending on machines, the bag-in-carton 1 may be set suitably with the pouring spout
5 faced upward or sidewise. By setting the bag-in-carton 1 on a machine with the pouring
spout 5 faced upward, run of the content from the pouring spout 5 can be prevented.
[0112] As described above, according to the present invention, the inner bag 3 can be firmly
fixed inside the carton 2 before the content 4 is drawn out, and as the content 4
is drawn out, the inner bag 3 can be released from the inside surfaces of the carton
to be deformed to the pouring spout 5. The releasable part of the inner bag 3 is withdrawn
into the unreleasable part thereof, whereby substantially all the content 4 can be
drawn out through the pouring spout 5 without failure. At this time, ton the pair
of side panels 2b, 2d the release of the inner bag 3 starts on the side of the remotest
end part 20 and stops at the strips 18, whereby the end position of the release of
the inner bag 3 can be exactly determined, and accordingly the inner bag 3 can be
uniformly deformed. As a result, the content 4 of the inner bag 3 can be supplied
in a stably constant amount.
A fourth Embodiment
[0113] A fourth embodiment of the present invention will be explained with reference to
the drawings.
[0114] FIGs. 14 to 19C are views of the fourth embodiment of the present invention. In FIG.
14, the bag-in-carton 1 comprises a substantially parllelepiped box-shaped carton
2 which provides an outer container, and a flexible inner bag 3 housed inside the
carton 2. A content 4, such as ink, is held in the inner bag 3. The carton 2 includes
an inclined panel between two panels of the rectangular parallelepiped one, that is,
the carton 2 comprises four flat side panels 2a, 2b, 2c, 2d, a top and a bottom panels
2f, 2e, and the inclined panel 2g formed between the side panel 2a and the top panel
2f.
[0115] A pouring spout 5 is attached to the inclined panel 2g of the carton 2 in communication
with the inner bag 3 and is closed by a cap 6. The pouring spout 5 has a tubular portion
5a extended in the inner bag 3 through the inclined panel 2g and the inner bag 3 (see
FIG. 1) and has grooved passages 5b for passing the liquid formed in the end part
of the tubular portion 5a on the side of the inner bag 3. Because of the passages
5b, even when, for example, the end of the tubular portion 5a in the inner bag 3 is
blocked by the inner bag 3, the content 4 can be drawn out into the pouring spout
5 through the passages 5b. A projection height of the pouring spout 5 beyond the carton
2 is so set that the cap 6 put on the pouring spout 5 is within a region defined by
an extension of the side panel 2a and an extension of the top panel 2f. This arrangement
permits a number of the bag-in-cartons to be laid one on another and side by side
in rows and columns.
[0116] The inner bag 3 is adhered fixedly to parts of the inside surfaces of the carton
2.
[0117] As shown in FIGs. 14 and 15, the inner bag 3 is adhered to substantially all the
inside surfaces of the inclined panel (pouring spout attaching panel) 2g and the side
panel 2a adjacent to the lower side of the inclined panel 2g. It is possible that
an adhesive is spotted on the inside surfaces of the inclined panel 2g and the side
panel 2a to spot-adhere the inner bag 3 to substantially all the inside surfaces of
the inclined panel 2g and the side panel 2a.
[0118] As shown in FIGs. 14 and 15, the inner bag 3 is adhered to the inside surfaces of
one pair of opposed side panels 2b, 2d adjacent to the inclined panel 2g except a
plurality of regions in the shape of recesses 19. The recesses 19 on the pair of side
panels 2b, 2d are extended substantially parallel with a straight line 21 (see FIGs.
11A and 11B)interconnecting the pouring spout 5 and a remote end part 20 of the carton
2 which is remotest from the pouring spout 5.
[0119] The plural recesses 19 are located on parts of the pair of side panels 2b, 2d which
are on the side of the remote end part of the carton 2, and the openings 19 are directed
to the remote end part 20. The inner bag 3 is adhered to substantially all parts of
the pair of side panels 2b, 2d which are on the side of the pouring spout 5.
[0120] The recesses 19 having the openings 19a directed to the remote end part 20 are thus
provided in the parts of the pair of side panels 2b, 2d on the side of the remote
end part 20, whereby the inner bag can be readily released from the pair of side panels
2b, 2d first on the side of the remote end part 20 (see FIGs. 11A and 11B) when the
inner bag is released from the inside surfaces of the carton as will be described
later. That is, the inner bag 3 can more readily released in comparison with the case
where the inner-bag adhering regions 9 are formed on the entire inside surfaces of
the pair of side panels 2b, 2d.
[0121] The inner bag 3 is adhered to the inside surface partially (the four corners) of
the side panel 2c of the side panels which are not adjacent to but remote from the
inclined panel 2g. FIG. 14 shows the inner-bag adhering regions 9 of the inner bag
3. FIG. 15 shows a carton blank 2' for forming the carton 2. In FIG. 15, the cross-hatched
part of the inner-bag adhering regions 9 are unreleasable regions 9a, and the line-hatched
regions are releasable region 9b.
[0122] The inner bag 3 is thus adhered to the substantially entire inside surfaces of the
inclined panel 2g and the side panel 2a adjacent to the lower side of the inclined
panel 2g, to the inside surfaces of the pair of side panels 2b, 2d except the recesses
19, and partially to the inside surface of the side panel 2c, whereby the inner bag
3 can be firmly fixed in the carton 2. The inner bag 3 is adhered to the carton by
means of a releasable adhesive. Accordingly, as the content is discharged, the inner
bag 3 is deformed to readily release the inner bag from the carton 2.
[0123] The inner bag 3 is spot-adhered to the side panel 2c at the releasable regions 9b.
When the content 4 is discharged through the pouring spout 5, the inner bag 3 is gradually
deformed and moved to the pouring spout 5. At this time, the inner bag 3 starts being
released first from the side panel 2c, which is remote from the pouring spout 5. The
spot-adhesion of the inner bag 3 to the side panel 2c facilitates the release of the
inner bag 3 from the side panel 2c. The inner-bag adhering regions 9 on the side panel
2c may be square as shown in FIG. 15 or may be rectangular.
[0124] Then, a method for forming the bag-in-carton 1 having the above-described structure
will be explained. First, a cardboard is punched in a prescribed shape as shown in
FIG. 15 to prepare a carton blank 2' to be set up into the carton. The inner-bag adhering
regions 9 are formed on the inside surface of the panels of the carton blank 2' 2a',
2b', 2c', 2d', 2g' (which are to be the side panels 2a, 2b, 2c, 2d and the inclined
panel 2g). While the carton blank 2' is being formed, as shown in FIG. 4, a sheet
film is folded into a tubular shape and back-sealed at end portions to form a back-sealed
portion 16. The folded film is cut into tubular films 3' of a required length (whose
top and bottom ends will be sealed in a later step into the inner bags).
[0125] Then, an adhesive, e.g., an emulsion-type adhesive, as of vinyl acetate group, acryl
copolymer group, vinyl acetate-acryl copolymer group, modified ester acrylate copolymer
group, etc., is applied to the inner-bag adhering regions 9 which are formed on the
substantially entire inside surfaces of the panels 2a', 2b', 2d' and 2g' of the carton
blank 2'. The adhesive is applied to the inner-bag adhering regions 9 formed partially
on the side panel 2c' and a glue margin 2h' of the carton blank 2'. The glue margin
2h' is a part forming the side panel 2b of the carton 2, and the inner-bag adhering
regions 9 on the glue margin 2h' includes an unrelesable region 9a and a releasable
region 9b. The emulsion-type adhesive is also applied to the back side of the glue
margin 2h'.
[0126] A glue margin 2i' of the carton blank 2' is folded inside when the carton blank 2'
is set up, and a hot-melt adhesive, as of ethylene-vinyl acetate copolymer group,
polyvinyl acetate group, polyamide roup, polyethylene group, styrene-butadiene copolymer
group, styrene-isobutylene copolymer group, polyisobutylene group, polyester group,
etc., is also applied to the glue margin 2i'.
[0127] Then, as shown in FIG. 15, the tubular film 3' is adhered to the panels 2a', 2d',
2g' of the carton blank 2' by means of an adhesive. The tubular film 3' is so arranged
that the back-sealed portion 16 is in abutment on the side panel 2c and is opposed
to the pouring spout 5 when the carton blank 2' is set up. Then, the side panels 2b',
2c' are folded on the tubular film 3' and barrel-sealed. The panels 2b', 2c' and the
glue margin are adhered to the tubular film 3', and the panels 2b' are adhered. Thus
a flat bag-in-carton before being set up is formed.
[0128] Then, the flat bag-in-carton 1 is fed to the setting-up step portion and the loading
step portion, and is set up there into a rectangular parallelepiped and completed
one. Then, a pouring spout attached portion 15 (FIG. 15) of the carton blank 27 is
punched, and the pouring spout 5 is attached. Then, the upper end of the tubular film
3' is seal-closed.
[0129] After the upper end of the tubular film 3' is sealed, the top of the carton blank
2' is set up.
[0130] Then, the lower end of the tubular film 3' is sealed in the same way as the upper
end thereof, and then the bottom of the carton blank 2' is set up. And the bag-in-carton
1 accommodating the inner bag 3 in the carton 2 is set up. This process can be conducted
by the conventional bag-in-carton forming technique, and the forming equipments, etc.
are not explained. Finally a content 4, such as ink or others, is loaded in the bag-in-carton
1, and the bag-in-carton 1 has the state shown in FIG. 14.
[0131] In using the bag-in-carton filled with a content 4, as shown in FIGs. 11A and 11B,
the bag-in-carton is set on a machine, such as a printing machine or others, with
the pouring spout directed downward, and the pouring spout is connected to a connector
(not shown) of drawing means belonging to the machine. The content 4 is drawn and
discharged through the pouring spout 5. At this time, the inner bag 3 starts being
released from the inner-bag adhering regions 9 on the side panel 2c, which are spot-adhesions,
and then from the pair of opposed side panels 2b, 2d. As the content 4 is drawn, the
released parts of the inner bag 2 is deformed as shown by the two-dot lines 21a, 21b
in FIG. 11B and is displaced to the pouring spout 5, whereby the content 4 can be
discharged in a stably constant amount without letting air into the inner bag 3. Finally
the released part of the inner bag 3 is withdrawn into the unreleasable part thereof,
which is fixed to the inside surfaces of the carton 2 and are substantially a rest
half of the inner bag 3, and almost all the content is discharged.
[0132] Next, the adhesive strength of the releasable part 9a and the unreleasable part 9a
will be explained.
[0133] Adhesive strengths of the releasable part 9b and the unreleasable part 9a are substantially
as follows.
[0134] An adhesive strength (a force (gf) 15 mm-width samples required to be released when
subjected to a tensile test at the room temperature) is
a strength of the unreleasable part 9a at the start of the release: about 4.6 N
(470 gf)
an adhesive strength of the releasable part 9b: about 2.1 N (210 gf).
[0135] It is preferable that the unreleasable part 9a has a higher adhesive strength than
that of the releasable part 9b.
[0136] As described above, according to the present embodiment, when the content 4 is drawn
out through the pouring spout 5, the inner bag 3 starts being released first from
the inner-bag adhering regions 93, to which the inner bag 3 is spot adhered, and then
from the inside surfaces of the one pair of the side panels 2b, 2d, and is gradually
deformed and displaced to the pouring spout 5. Then, the released part of the inner
bag 3 is withdrawn into the unreleasable part thereof, whereby substantially all the
content 4 can be drawn out through the pouring spout 5.
[0137] Because of the recesses 19 having the openings 19a directed to the remote end part
20 (see FIGs. 11A and 11B) provided on the parts of the inner-bag adhering regions
9 on the pair of side panels 2b, 2d, which (parts) are on the side of the remote end
part 20, the inner bag 3 can be readily released from the pair of side panels 2b,
2d first on the side of the remote part 20 when the inner bag 3 is released from the
inside surfaces of the carton 2.
[0138] The back sealed portion 16 on the inner bag 3 abuts on the side panel 2c and is opposed
to the pouring spout 5. This arrangement enables the content 4 of the inner bag 3
to be driven to the pouring spout without failure when the inner bag 3 is deformed,
displaced to the pouring spout 5 as the content 4 is drawn out.
[0139] That is, the back sealed portion 16 of the inner bag 3, which is harder than the
rest part of the inner bag 3, tends to hinder the deformation when the inner bag 3
is deformed. Accordingly in a case where the back sealed portion 16 abuts on, e.g.,
the side panel 2b, which is adjacent to the inclined panel 2g (the pouring spout attached
panel), the back sealed portion 16 hinders the deformation of the inner bag 3 with
a possible result where the inner bag 3 may be deformed horizontally unsymmetrically
with respect to the pouring spout 5.
[0140] According to the present invention, because the back sealed portion 16 is located
opposed to the pouring spout 5, the inner bag 3 can be deformed horizontally symmetrically
with respect to the pouring spout 5 as a center, whereby the content 4 of the inner
bag 3 can be smoothly sent out to the pouring spout without unsymmetrical deformation.
[0141] Next, another embodiment of the present invention will be explained with reference
to FIG. 16. The embodiment shown in FIG. 16 is substantially the same as the embodiment
shown in FIGs. 14 and 15 except that the inner-bag adhering regions have different
shapes from those of the embodiment shown in FIGs. 14 and 15.
[0142] As shown in FIG. 16, a tubular film 3' (to be the inner bag 3) is adhered to the
substantially entire parts of side panels 2b', 2d' (to be one pair of side panels
2b, 2d), which (parts) are on the side of a pouring spout 5 with respect to an middle
part 22 which is formed on the substantially middle of a straight line 21 (FIGs. 11A
and 11B) interconnecting the pouring spout 5 and a remote end part 20 of the carton
2 and is normal to the straight line 21. The tubular film 3' is spot-adhered to a
plurality of spots 14 on the parts of the side panels 2b', 2d' which (parts) are on
the side of the remote end part 20 with respect to the middle part 22.
[0143] In FIG. 16, the inner-bag adhering regions provided on the substantially entire parts
of the side panels 2b', 2d' on the side of the pouring spout 5 are unreleasable regions
9a. The plural spotted inner-bag adhering regions 14 provided on the part of the side
panels 2b', 2d' on the remote end part 20 are releasable regions 9b. The inner-bag
adhering regions 9 include a releasable region 9a and an unreleasable region 9b.
[0144] As shown in FIG. 16, the tubular film 3' is spot-adhered to plural spots 14 on the
parts of the side panels 2b', 2d' on the side of the remote end part 20 with respect
to the middle part 22, whereby the inner bag can be readily released from the pair
of side panels 2b, 2d first from the side of the remote end part when the inner bag
3 is released from the inside surfaces of the carton 2.
[0145] Then further another embodiment of the present invention will be explained with reference
to FIGs. 17A to 19D. The embodiment shown in FIGs. 17A to 19C is substantially the
same as the embodiment shown in FIGs. 14 and 15 except that the inner-bag adhering
regions on the pair of side panels 2b', 2d' (to be the pair of side panels 2b, 2d
opposed to each other) have different shapes from those of the embodiment shown in
FIGs. 14 to 15.
[0146] In FIGs. 17A to 19C, for simplification of explanation, only the side panel 2b' of
the pair of side panels 2b', 2d' will be explained, but shapes of inner-bag adhering
region on the side panel 2d' are symmetrical with those of the inner-bag adhering
region on the side panel 2b'.
[0147] As shown inn FIG. 17A, a tubular film 3' (see FIG. 15) is adhered to the substantially
entire part of the inside surface of the side panel 2b', which (part) is on the side
of a middle part 22 which is formed on the substantially middle part of a straight
line 21 interconnecting the pouring spout 5 and a carton 2 (FIGs. 11A and 11B) and
is normal to the straight line 21. The tubular film 3' is spot-adhered to a plurality
of spots 14 on the part of the side panel 2b' on the side of the remote end part 30
with respect to the middle part 22.
[0148] In FIG. 17A, the inner-bag adhering regions provided on the substantially entire
part of the side panel 2b' on the side of the pouring spout 5 are an unreleasable
region 9a, and the inner-bag adhering regions of the side panel 2b' on the side of
the remote end part 20 in the form of the plural spots are releasable regions 9b.
As shown in FIG. 17A, the plural spot regions are respectively rectangular.
[0149] The plural spots 14 may be formed in a shape of strips each having the same width
and their areas may be decreased toward the side of the remote end part 20 (FIG. 17B).
The decrease of areas toward the side of the remote end part 20 facilitates the release
of the inner bag 3 first from the side of the remote end part 20.
[0150] It is also possible that the plural spots 14 are formed in rectangles of the same
size and decrease their number toward the remote end part 20 (to lower right side)
(FIG. 17C).
[0151] It is also possible that the plural spots 14 may be formed in rectangles and gradually
decrease their areas toward the remote end part 20 (lower right side ) (FIG. 17D).
[0152] As shown in FIG. 17E, the plural spots 14 may be formed in a shape of strips, and
their widths and areas may be decreased toward the side of the remote end part (lower
right side).
[0153] As shown in FIG. 17F, the plural spots 14 may be respectively formed in a round shape.
[0154] As shown in FIG. 18A, the tubular film 3' is adhered to the substantially entire
part of the inside surface of the side panel 2b' which (part) is on the side of the
pouring spout 5 with respect to the middle part 22, and is adhered to a plurality
of spots 14 of the part of the inside surface on the side of the remote end part 20.
In FIG. 18A, the inner-bag adhering region provided on the substantially entire part
of the side panel 2b' on the side of the pouring spout 5 is an unreleasable region
9a and has the edge on the side of the middle part 22 which is bent. The plural spots
14 on the side of the side panel 2b' on the side of the remote end part 20 are releasable
regions 9b, and each has a rectangular shape.
[0155] The plural spots 14 may be a rectangle of the same size or may gradually decrease
their number toward the side of the remote end part 20 (lower right side) (FIG. 18B).
[0156] The plural spots 14 may be formed in rectangles and gradually decrease their areas
toward the side of the remote end part 20 (lower right side) (FIG. 18C).
[0157] As shown in FIG. 18D, the plural spots 14 may be formed in a shape of strips, each
having the same width and gradually decrease their areas toward the side of the remote
end part 20 (lower right side).
[0158] As shown in FIG. 18E, the plural spots 14 may be formed respectively in a shape of
strips and decrease their widths and areas toward the side of the remote end part
20 (lower right side).
[0159] As shown in FIG. 18F, the plural spots 14 may be formed respectively in a round shape
and gradually decrease their areas toward the side of the remote end part 20.
[0160] As shown in FIG. 19A, the tubular film 3' is adhered to the inside surface of the
panel 2b' in the inner-bag adhering regions 9. The inner-bag adhering regions 9 are
in a form of a plurality of spots 14. The respective spots 14 are formed respectively
in rectangles and gradually decrease their areas toward the side of the remote end
part 20 (lower right side). Those of the inner-bag adhering regions 9 on the side
of the pouring spout 5 (upper left side) are unreleasable regions, and those of the
inner-bag adhering regions 9 on the side of the remote end part 20 (lower right side)
are releasable regions.
[0161] As shown in FIG. 19B, the plural spots 14 may be formed respectively rectangles of
the same size and gradually decrease their numbers toward the side of the remote end
part (lower right side).
[0162] As shown in FIG. 19C, the plural spots 14 may be formed respectively in a form of
strips and decrease their widths toward the side of the remote end part 20 (lower
right side).
[0163] As shown in FIG. 19C, the plural spots 14 are formed in a form of strips and decrease
their widths toward the side of the remote end part 20 (lower right side).
[0164] In the above-described embodiments, the pouring spout 5 unessentially has the tubular
portion 5a which is extended into the inner bag 3, and may be a usual one without
the tubular portion. It is possible that a suitable passage member (e.g., a rod member
of H-section or others) which ensures flow passage of the content even when the releasable
part of the inner bag 3 is withdrawn in the unreleasable part thereof is provided
on the bottom of the inner bag 3.
[0165] In the above-described embodiments, the bag-in-carton 1 is set on a machine with
the pouring spout 5 faced downward, but this state is not essential to discharge the
content of the bag-in-carton 1. Depending on machines on which the bag-in-carton 1
is set, the pouring spout 5 may be faced suitably sideways or upward. In a case that
the bag-in-carton 1 is set on a machine with the pouring spout 5 faced upward, run
of the content at the pouring spout can be prevented.
[0166] As described above, according to the present invention, when the inner bag 2 is released
from the inside surfaces of the carton 2 as the content decreases, the inner bag 3
can be readily released from the pair of side panels 2a, 2d first from the side of
the remote end part 20. Accordingly the inner bag 3 can be deformed in the carton
2.