[0001] The present invention relates to a method for making pouches and a packaging apparatus
for making such pouches.
[0002] A method for producing pouches comprising the steps of providing a continuous web,
folding the web to provide confronting side surfaces joined along a bottom edge and
forming a vertical seal between the confronting side surfaces, thereby providing a
series of adjacent pockets having opposite side walls, with each pocket having an
unsealed opening along a top edge, and filling the pockets through the opening with
material and then sealing the opening to provide sealed pouches is known from
WO 2007/089838 A2.
[0003] In the known method, the continuous web is guided through a vertical sealer in which
the vertical seals are formed after the continuous web has been folded. Those vertical
seals are spaced from one another to provide a pocket which is defined by the bottom
edge as the bottom of the pocket and a leading edge which is defined by a vertical
seal, and a trailing edge which is defined by the neighboring vertical seal. The vertical
seal is provided such that neighboring pockets can be separated without impeding the
closure of the pocket by the vertical seal. By separating the pockets, individual
pouches are formed.
[0004] In the method known from
WO 2007/089838 A2, the continuous web is transferred to a cutting section in which the continuous web
is cut to isolate individual pouches having an unsealed opening along the top edge.
Those pouches are transferred by a vacuum belt transport means against which the separated
pouches are sucked and transferred to a filler wheel. The filler wheel has gripping
elements which are adapted to grip the leading and tailing edges of each pouch, respectively,
between jaws and are movable relative to each other to open the unsealed opening.
As the distance between the leading and the tailing edges of one single pouch is reduced,
the distance between the confronting side surfaces in increased. Accordingly, spouts
of a spout wheel can be introduced into the pouches for filling the same with material.
The spout wheel and the filler wheel are rotatably driven. The rotational axis of
the filler wheel is essentially co-axial to the rotational axis of the spout wheel.
However, the rotational axes are slightly inclined relative to each other. At a circumferential
section in which the distance between the spout wheel and the filler wheel is at its
minimum, a respective spout is received within the open mouth of the pouches and then
continuously retracted from the pouch as the filler wheel and the spout wheel are
continuously rotated, starting from this position.
[0005] After the pouches have been filled, the gripping means are actuated such that the
distance between the leading and the tailing edges of the each spout are increased,
thereby bringing the confronting side surfaces closer together and closing the unsealed
opening. In the course of the circular path along the outer circumference of the filler
wheel, the pouches are finally sealed by a sealing section arranged at the outer circumference
of the filler wheel and provided with heated sealing surfaces abutting against the
folded web material for sealing the opening.
[0006] The method known from
WO 2007/089838 A2 and the apparatus for carrying out said method is disadvantageous in that it requires
a fusible film material for making the web. Fusible film materials are not suitable
for making a packaging for e.g. tea, coffee or the like, because these substances
have to be brewed while still contained in the pouch. Further, fusible film materials
usually require a plastic material for forming the web or at least a plastic coating
on the web, which may be disadvantageous for ecological reasons in case the material
has to breathe.
[0007] Further, the apparatus known from
WO 2007/0898238 A2 has a complex constitution, which may be troublesome due to the fact that each pouch
is gripped at its leading and trailing edge by a gripping unit. The gripping unit
makes manufacturing of the apparatus for carrying out the packaging method expensive.
The vacuum belt transport means add to the rather complex constitution of the known
apparatus. Further, handling of isolated pouches may cause problems, in particular
if pouches are to be made in a fast and economic way.
[0008] US 4 534 185 A is a further example of a method in which pouches are formed from a continuous web
and then transferred as individual items to a filler wheel in which the pouches are
filled with material, then sealed and finally discharged from the filler wheel as
sealed pouches. The drawbacks of the apparatus and the method known from this prior
art document are essentially the same as the ones discussed with reference to
WO 2007/089838 A2. A similar method and apparatus are disclosed in
JP 11 292001 A.
[0009] US 3 563 001 A is an example of an apparatus and a method in which vertical seals are formed on
a wheel defining a vertical filler. The continuous web providing pockets between the
vertical seals and a bottom edge is continuously conveyed to a filler wheel in which
the pockets are filled with material, essentially in the same way as discussed above
with reference to
WO 2007/089838 A2. The continuous web is transferred from the circular path around the filler wheel
to a linear path and to a top sealer in which the unsealed opening of the pockets
is sealed. Then, the continuous web is twisted such that the vertical orientation
of the web is transferred into a horizontal orientation. In said horizontal orientation,
the web is conveyed to a cutting table on which the material defining the pockets
is cut at the vertical seal to thereby isolate individual sealed pouches, which are
made to slide from the cutting table.
[0010] A respective apparatus and method is described e.g. in
US 5 502 951 A,
US 3 597 898 A,
CA 2 142 480 A1 or
US 6 058 818 A. The aforementioned prior art with a separate cutting station for separating the
pouches from a continuous web are bulky. Furthermore, pouches separated on the cutting
table have to be collected after cutting in order to further process the individual
pouches. In other words, the predetermined orientation and holding of individual pouches
is lost during cutting, making processing of the filled and sealed pouches troublesome.
[0011] The present invention aims to provide a method form making pouches and a packaging
apparatus for making pouches by at least partially avoiding the aforementioned disadvantages
and drawbacks. In particular, the present invention aims to improve the method known
from
WO 2007/089838 A2 such that transfer of the web to the filler wheel is facilitated, and to improve
the packaging apparatus in particular to reduce complexity and bulkiness of the apparatus
known from
WO 2007/089838 A2.
[0012] As a solution to the aforementioned problem, the present invention provides a method
as specified in claim 1. In said method, the web is perforated to form a perforation
between a leading length piece of the web and a trailing length piece of the web.
The respective length pieces are adapted to form a leading pocket and a trailing pocket,
respectively. In the inventive method, the web may be perforated before forming the
vertical seal, during forming the vertical seal or after forming the vertical seal.
Accordingly, the inventive method specifies the forming step of a perforation between
length pieces. Those length pieces may already correspond to the length of pockets,
i.e. length sections of the web being provided with the vertical seal. However, as
opposed to the method known from
WO 2007/089838 A2, the web is not separated to form isolated pouches, but only perforated such that
the continuous web can be treated as a continuum and e.g. prepared for filing the
pockets with material and/or filling the pockets while the continuous web still exists.
In the inventive method, the length pieces forming the pouches are separated by tearing
them from the continuous web. For this, the inventive method proposes to increase
the distance between a trailing edge of the leading length piece and a leading edge
of the trailing length piece. The trailing edge of the leading length piece and/or
the leading edge of the trailing length piece may be defined by the perforation. Increasing
of the length of adjacent edges of neighboring length pieces will lead to an increased
strain on the web at the location of the perforation. Finally, the web will be torn
at the perforation, thereby isolating the separated length pieces.
[0013] In the description of the present invention, reference is made to the feature "vertical
seal". This vertical seal is a seal which is provided at predetermined distances along
the longitudinal axis of the folded web. The vertical seal is usually arranged in
vertical direction upon filling of the pocket. The feature "vertical seal" does not
specify the orientation of the continuous web when the vertical seals are made. When
making the vertical seals, the continuous web can have any orientation. The vertical
seals can be made by any suitable method adapted to connecting the confronting side
surface of the folded web to each other on a regular basis, vertical sealing is achieved
by the application of heat to melt a fusible material arranged between the confronting
side surfaces of the continuous web to be joined by the vertical seal.
[0014] On a general basis, the length pieces are separated after pockets have been formed.
Thus, tearing of the continuous web will lead to isolation of individual pouches.
Tearing of the continuous web is usually conducted before the pouches are filled.
In this preferred embodiment the trailing edge of the leading length piece and the
leading edge of the trailing length piece are defined by a trailing and a leading
end, respectively, of neighboring individual pouches. Those neighbouring leading and
trailing edges are usually formed by a single vertical seal, i.e. a seal which has
been produced at one instance but may have different sealing section separated by
a mid area in which a perforation is made.
[0015] Preferably, tearing of the continuous web is conducted as the web is moving in a
circular path. For this, the continuous web is preferably abutted against an outer
circumference of a rotating filler wheel. In the course of the rotational movement
of the filler wheel, the continuous web follows the circular path. According to the
preferred embodiment, the leading and the trailing length pieces are torn apart while
the length pieces are moved on the circular path, i.e. while rotating with the filler
wheel. In the course of the tearing action, not only the pockets are isolated to render
the same pouches but tearing will likewise bring the leading and the trailing edge
of a single length piece closer together, thereby urging the confronting side surfaces
away from each other at the unsealed opening to open the unsealed opening.
[0016] Thus, tearing apart the length pieces will not only isolate the length pieces but
will also widen the opening to facilitate the filling of the pocket with material.
[0017] According to a preferred embodiment, the trailing edge of the leading pocket is pierced
by a trailing arm of a leading gripping unit of the filler wheel and the leading edge
of the trailing pocket is pierced by a leading arm of a trailing gripping unit of
the filler wheel. The leading and the trailing pockets are torn apart for forming
open pouches by pivoting at least one of the leading and the trailing arms toward
the other of the trailing and the leading arms of the same gripping unit. The axis
around which the at least one arm is pivoted generally extends parallel to the rotational
axis of the filler wheel. In other words, by pivoting the at least one arm, the forward
free ends of both arms are brought closer to each other in circumferential direction
of the filler wheel. This applies at least to an upper end section of the pocket and/or
pouch. For such piercing action, an end side of the free end of each arm is usually
provided with needles which are adapted to pierce the material forming the continuous
web. The needles may be movable relative to the arm. On a regular basis, the needles
are securely held by the respective arms.
[0018] In order to secure the continuous web to the leading and the trailing arms, the web
is preferably pressed against those arms by a rotating pressure roll. This rotary
pressure roll usually cooperates with the radial end face of each trailing and leading
arm, respectively. The rotary pressure roll is usually arranged stationary while the
filler wheel is rotating.
[0019] For facilitating the filling of the pouches, a longitudinal opening guide means is
preferably introduced between the confronting side surfaces. Respective longitudinal
opening guide means is usually arranged at the outer circumference of the filler wheel
such that the unsealed opening receives the longitudinal opening guide means. Accordingly,
the longitudinal opening guide means is introduced through the unsealed opening into
an upper end section of the pouch. In said upper end section, the vertical seal usually
does not exist.
[0020] Accordingly, this vertical end section be identified as an unsealed vertical end
section. The overall length of the unsealed vertical end section in relation to the
overall vertical length of the folded web is usually between 3% and 15%, preferably
between 3% and 10%. The longitudinal opening guide means usually comprises a guide
wedge which is adopted to be introduced into the open mouth of the open pouch. The
guide wedge usually extends in circumferential direction and with distance to radial
end face of the arms. The guide wedge is usually slightly inclined relative to the
plane comprising the filler wheel, which plane extends perpendicular to the rotational
axis of the filler wheel. Thus, and as the pouches are rotating with the rotational
movement of the filler wheel, the guide wedge is introduced into the open pouch.
[0021] The longitudinal opening guide means usually has a chamfered widening section arranged
to be received within the pouch to force the confronting side surface away from each
other. This chamfered widening section is arranged at a position in which the longitudinal
guide means are already introduced into the open pouch. In the sequence of the circular
path on which the pockets move, guide rails extend from the widening section. Said
guide rails are spaced from one another and extend essentially in circumferential
direction of the filler wheel. The radial distance between the guide rails is preferably
selected such that at least a tip of an assigned spout of the spout wheel may be projected
between the guide rails.
[0022] Irrespective of the specific means for attaining such a separation of the confronting
side surface by the longitudinal opening guide means, it is preferred to provide a
separation of the confronting side surfaces by such longitudinal opening guide means
until a spout of the spout wheel has been introduced into the pocket. Accordingly,
the longitudinal opening guide means preferably extends only over a certain circumferential
length along the outer circumference of the filler wheel until the spout has been
introduced into the pocket through the unsealed opening.
[0023] According to a further preferred embodiment of the inventive method, the leading
and the trailing length pieces are torn apart as the longitudinal opening guide means
are received between the confronting side surfaces. Accordingly, the longitudinal
opening guide means will assist separation of the confronting side surfaces and thus
opening of the unsealed opening of the spout in the course of the carrying action.
[0024] According to a further preferred embodiment of the present invention, the pouches
are closed by pivoting at least the leading and the trailing arms away from the other
of the trailing and the leading arms of the same gripping unit after filling of the
pouch. Accordingly, by the pivotable movement of the at least one arm, the confronting
side surfaces of each pouch are brought closer to each other at least at an upper
end section thereof, i.e. in the region of the unsealed opening. Accordingly, in this
preferred embodiment, the pouches are formed while moving on the circular path provided
by the filler wheel, are opened on said circular path, are filled while the spout
is introduced into the pouch and while moving on the circular path and are subsequently
closed by straightening the unsealed opening along the top edge of the pouch while
moving on the circular path.
[0025] After this, the pouches are sealed at the top edge to enclose the volume of the pouch
containing the material filled in each pouch. According to a preferred embodiment
of the present invention, the pouches are transferred from the circular path provided
by the filler wheel to a linear sealing path, in which the opening is sealed.
[0026] The present invention furthermore specifies an apparatus for making pouches as previously
known from
WO 2007/089838 A2. This known apparatus has feeding means for feeding a continuous web and folding
means for folding the web to provide confronting surfaces joined along a bottom edge.
Further, vertical sealing means are provided for forming a vertical seal between the
confronting side surfaces at spaced intervals along the web, thereby providing a series
of adjacent pockets having opposite side walls with each pocket having an unsealed
opening along a top edge. The generic packaging apparatus furthermore has filling
means for filling the pockets with a material and horizontal sealing means for finally
sealing the unsealed opening. Those means defining the preamble of claim 10 may be
formed as described e.g. in
WO 2007/089838 A2.
[0027] As a solution to the above problem, the inventive packaging apparatus furthermore
provides perforation means for perforating the continuous web between a leading length
piece of the web adapted to form a leading pocket and a trailing length piece of the
web adapted to form a trailing pocket. Further, the inventive packaging apparatus
has tearing means adapted to tear the leading length piece and the trailing length
piece apart by increasing the distance between the trailing edge of the leading length
piece and the leading edge of the trailing length piece.
[0028] Such apparatus is in particular suitable for carrying out the inventive method and
for avoiding any cutting of the continuous web to isolate the pouches from the continuous
web before the same is secured to the filler wheel. The inventive apparatus is in
particular suitable for tearing apart a continuous web made of infiltratable material,
such as e.g. the material of which filter bags for tea and other brewable or extractable
substances are usually made of.
[0029] According to a preferred embodiment of the present invention, the filling means and
the tearing means are assigned to a rotatable filler wheel, thereby providing a separation
section at the circumference of the filling wheel and, furthermore, a closing section
in which the tearing action is reverted to bring the confronting side surfaces at
the top edge closer together.
[0030] According to a further preferred embodiment of the present invention, the filler
wheel comprises plural leading and trailing arms assigned to pierce the leading and
the trailing edge of a length piece of the continuous web adapted to form a single
pouch, respectively. At least one of those leading and trailing arms, each of which
is assignable to a specific length piece and/or pocket of the continuous web and thus
forming a gripping unit for such length piece and/or pocket, is pivotably supported
on the filler wheel about an axis extending essentially parallel to the rotational
axis of the filler wheel to bring radial free ends of the respective arms closer to
each other in circumferential direction of the filler wheel. Each of the radial end
faces is provided with needles which project in radial direction and are adapted to
pierce the continuous web to secure the same against the leading and the trailing
arms, respectively. Securing is attained such that pivotable movement of the at least
leading or trailing arm will increase the distance between the trailing edge of a
leading length piece and the leading edge of a trailing length piece to thereby tear
the continuous web between those to neighboring edges to separate the pouches.
[0031] Further details, advantages and features of the present invention will become apparent
from the following description of a specific embodiment thereof in connection with
the drawing. In the drawing:
- Fig. 1
- is a perspective side view of a first embodiment;
- Fig. 2
- is a top view of the first embodiment;
- Fig. 3
- is a perspective side view of the first embodiment with the spout wheel;
- Fig. 4
- is a perspective side view of a piercing section of the first embodiment;
- Fig. 5
- is an enlarged perspective side view of an opening and separation section of the first
embodiment;
- Fig. 6
- is an enlarged perspective side view of a discharging section of the first embodiment;
- Fig. 7
- is a perspective view of the second embodiment of the present invention;
- Fig. 8
- is a top view of the second embodiment;
- Fig. 9
- is an enlarged perspective side view essentially in accordance with Figure 7 elucidating
the sealing section of the second embodiment; and
- Fig. 10
- is a perspective side view of the discharging section of the second embodiment.
[0032] Figures 1 and 2 are provided to illustrate a filler wheel 2 of the inventive packaging
apparatus. This filler wheel 2 comprises a plurality of leading arms 4 projecting
in radial direction and being stationary held on the filler wheel 2 and a plurality
of trailing arms 6 which are pivotably held about a joint 8 providing a pivot axis
extending essentially parallel to a rotational axis 10 of the filler wheel 2. One
leading and one trailing arm define a gripping unit 11.
[0033] From a radial end face 12 of each arm 4, 6 plural needles 14 project in radial direction
of the filler wheel 2. As derivable in particular from Figs. 1 and 4, each arm 4,
6 defines an upper segment 4a, 6a and a lower segment 4b 6b, respectively. The needles
14 are each provided on the upper segments 4a, 6a and the lower segments 4b, 6b. Between
those upper segments 4a, 6a and the lower segments 4b, 6b, a recess 16 is formed projecting
radially inwardly. The filler wheel 2 receives a continuous web 18 which is pulled
by opposing pulling rollers 20. The continuous web 18 is received by the pulling rollers
20 as a folded web 18 in which confronting side surfaces 22 are joined along a bottom
edge 24 formed by folding. This folded continuous web 18 is furthermore provided with
vertical seals 26 defining therebetween pockets 28 which are vertically closed by
the vertical seals 26 and, at their bottom, closed by the bottom edge 24, but have
an unsealed opening 30 at and below their top edge 31. Respective folded continuous
web 18 is e.g. prepared by a sealer previously described e.g. in
WO 2007/089838 A2, the disclosure thereof being incorporated herein by reference.
[0034] At a piercing section PI, a pressure roll 32 is provided which is adapted to press
the continuous web 18 against the radial end face 12 of the arms 4, 6, respectively.
As in particular derivable from Figs. 3 and 6, the pressure roll 32 is provided with
circumferential groove 34 adapted to receive the needles 14. Between this pressure
roll 32 and the pulling rollers 20, the web is conveyed on a linear path. Within said
linear path, a rotating perforation knife 36 is provided which cooperates with a stationary
knife counter-element 38. The perforation knife 36 and the knife counter-element 38
are adapted to provide a perforation 46 within the vertical seal 26 to divide the
same into a leading sealing section 40 of a trailing length piece 48 and a trailing
sealing section 42 of a leading length piece 48. In the embodiment shown in Fig. 4,
the vertical seal 26 does not extend over the entire width, i.e. the vertical extension,
of the continuous web 18. In fact, the vertical end section arranged above the upper
segment 4a, 6a of each arm 4, 6 is not provided with a seal, thereby defining an unsealed
vertical end section 44. This unsealed vertical end section 44 has an extension corresponding
essentially to 10% of the overall width of the folded continuous web 18 starting from
the top edge 31.
[0035] In Fig. 4, the perforation 46 resulting from the treatment of the folded continuous
web 18 by the perforation knife 36 and the knife counter-element 38 is depicted between
the leading sealing section 44 and the trailing sealing section 42 of two neighboring
length pieces 48 of the continuous folded web 18.
[0036] As in particular derivable from Fig. 3, the continuous folded web 18, when moved
along the circular path, will cooperate with a longitudinal opening guide means 50.
This longitudinal opening guide means 50 is bent to conform to the outer circumferential
contour of the filler wheel 2 and is inclined relative to the plane in which the filler
wheel 2 extends and which runs perpendicular to the rotational axis 10 the filler
wheel 2. Accordingly, when moved along the circular path, the longitudinal opening
guide means 50 is introduced through the unsealed opening 30 and arranged between
the confronting side surfaces 22. A forward end of the longitudinal guide means 50
is formed by a single central guide rail 52 (see Fig. 5). This central guide rail
52 merges into a chamfered widening section 54 of the longitudinal opening guide 50,
from which two parallel guide rails 56 project towards the rearward end of the longitudinal
opening guide means 50 which parallel guide rails 56 extend parallel to each other
and along the circular path for forming a longitudinal slot 58 therebetween.
[0037] As derivable in particular from Figs. 3 and 5, the embodiment furthermore has a spout
wheel 60 from which a plurality of spouts 62 extend which have a chamfered forward
free end defining a tip 64. As the confronting side surfaces 22 are forced away from
each other by the parallel guide rails 56, this forward tip 64 of the assigned spout
62 will enter into the longitudinal slot 58 and thereby between confronting side surfaces
22 defining the unsealed vertical end section 44. After the spout 52 has been introduced
into the pocket 28 with its forward tip 64, the pocket 28 will run free from the longitudinal
opening guide means 50 in the course of the rotational movement of the continuous
web 18.
[0038] As derivable from Figs. 3 and 4 in combination with Fig. 2, and as the longitudinal
opening guide means 50 remain introduced into the pockets 28, the trailing arm 6 is
pivoted so as to assume a position in which the radial end face 12 of the assigned
trailing arm 6 is arranged closer to the respective radial end face 12 of the assigned
leading arm 4 of the same gripping unit 11. By this pivotable movement, the neighboring
length pieces 48 secured to respective arms 4, 6 by means of the needles 14 are torn
apart and, thus, individual unsealed pouches P are formed. Each pouch P has a leading
edge 26a formed by the leading vertical seals 26 and a trailing edge formed by the
trailing vertical seals 26.
[0039] By the pivotable movement the distance between the leading edge 26a and the trailing
edge 26b of a single length piece 48 is increased, leading to separation of individual
pouches P. Further, by reducing the distance between the radial free end faces 12
of the assigned arms 4, 6, the confronting side surfaces 22 of a single pouch P are
bent outwardly to open the pouches (see Fig. 5). Pivoting of the trailing arm 4 for
tearing neighboring length pieces 48 apart essentially starts at a circumferential
position of the filler wheel 2 corresponding to the position of the chamfered widening
section 54 of the longitudinal opening guide means 50. This circumferential segment
around the rotating filler wheel 2 is identified as a separation and opening section
S in Fig. 2. This separation and opening section S is followed by a filling section
F in rotational direction of the filler wheel 2. In the other direction and ahead
of the separation and opening section S, there is provided an opening section in which
the longitudinal opening guide means 50 are merged into the pockets 28. The segment
comprising the pressure roll 32 is identified as a piercing section PI in which the
continuous web 18 is pierced by the needles 14. The piercing section PI, the opening
section O, the separation and opening section S as well as the filling section F are
arranged around the circumference of the filler wheel 2 and, thus, on the circular
path on which the continuous web 18 is conveyed when the filler wheel 2 is rotated.
[0040] In the filling section F, the spout wheel 60, having a rotational axis 65 slightly
inclined relative to the rotational axis 10 of the filler wheel 2 while essentially
being co-axially positioned in relation thereto, is brought closer to the filler wheel
2. Thus, the individual spouts 62 are introduced into the pouches P. Material is filled
through the spouts 62 into the pouches P. Simultaneously, in the course of the rotation
of the filler wheel 2 and of the spout wheel 60, the spouts 62 are withdrawn from
the pouches P, while material is still being filled into the pouches P. At the end
of the filler section F, the spout 62 is completely retracted from the assigned pouch
P.
[0041] Along the rotational movement of the filler wheel 2 and, thus, along the circular
path of the continuous web 18, the latter will be transferred from the filler section
F to a closing section C. In this closing section C, the trailing arm 6 is pivoted
back to its initial position in which it is arranged in the piercing section PI. In
the course of this pivotable movement, the unsealed vertical end section 44 of the
pouch P is straightened. The confronting side surfaces 22 are brought closer to each
other, thereby closing the pouch P.
[0042] The closing section C is followed by a discharging section D in which the pouches
P are transferred from the circular path and, thus, from the rotational movement of
the filler wheel 2, to a linear sealing path formed between an inner conveyor belt
66 and an outer conveyor belt 68 which are depicted in further detail in Fig. 6. The
discharging section D comprises a discharging guide 70 which projects into the filler
wheel 2 and is arranged in the recess 16, i.e. between the upper segment 4a, 6a and
the lower segment 4b, 6b of the respective arm 4, 6. This discharging guide 70 has
a guide surface which forces each pouch P in radial direction away from the filler
wheel 2, thereby forcing the material of the web 18 to be extracted from the needles
14. The movement of the pouches P affected by the discharging guide 70 is tangential
to the filler wheel 2. The inner conveyor belt 66 has a single belt element cooperating
with a lower section of the pouches P. The outer conveyor belt 68 has a lower belt
element 68a assigned to the inner conveyor belt 66 and an upper conveyor belt 68b
cooperating with the unsealed vertical end section 44. On the inner side, there is
provided a head sealing means 72 for the purpose of fusing and thereby sealing the
unsealed vertical end section 44 in order to seal the whole pouch P.
[0043] Figs. 7 to 10 visualize a second embodiment which is essentially identical with the
first embodiment described above. Thus, identical parts are identified with respective
reference signs as used for the first embodiment. However, the filing section F has
a slightly reduced extension in circumferential direction. Between the closing section
C and the discharging section D, there is provided a sealing section SI in which the
unsealed opening 30 and the unsealed vertical end section 44 is sealed as the pouches
P are moved on the circular path with the rotational movement on the filler wheel
2. Details of the sealing means SI are depicted in Fig. 9.
[0044] In Fig. 9 of the second embodiment, the head sealing means 72 is arranged above the
filler wheel 2 to thereby provide a sealing section SI on the outer circumference
of the filler wheel 2. The head sealing means 72 is provided with a heated bar 74
which is curved essentially corresponding to the outer radius of the filler wheel
2. This heated bar 74 is arranged slightly above the upper segment of each leading
and trailing arm 4, 6, respectively, so as to cooperate with the unsealed vertical
end section 44 of the pockets 28, which are pressed against the head sealing means
72 by an outer sealing belt 76.
[0045] Specifically, the head sealing means 72 have a guiding in section which is level
with the radial end face 12 of each arm 4, 6 and a guiding out section which radially
projects the forward tip provided by all needles 14. Accordingly, by means of the
head sealing means 72 the open pockets 28 are forced away from at least the needles
14 provided by the upper segments 4a, 6a of the leading and trailing arm 4, 6, respectively,
while at the same time pressing the unsealed vertical end section 44 against the outer
sealing belt 76 and as the open pouches P are rotated with the filler wheel 2. After
sealing the unsealed vertical end section 44 and thereby providing sealed pouches
P, the same are discharged in the discharging section D.
[0046] The discharging section D comprises inner and outer conveyor belts 66, 68. Both of
those conveyor belts 66, 68 have lower and upper conveyor belts a, b. The lower conveyor
belt 66b of the inner conveyor belt 66 is arranged within the recess 16, while the
upper conveyor belt 66a is arranged above the upper segment 4a, 6a of the arms 4,
6.
[0047] The conveyor belts 66, 68 are each guided by a curved guiding surface (not shown)
to discharge the sealed pouches from the filler wheel 2.
Reference signs
[0048]
- 2
- filler wheel
- 4
- leading arm
- 4a
- upper segment of leading arm
- 4b
- lower segment of leading arm
- 6
- trailing arm
- 6a
- upper segment of trailing arm
- 6b
- lower segment of trailing arm
- 8
- joint
- 10
- rotational axis
- 11
- gripping unit
- 12
- radial end face
- 14
- needle
- 16
- recess
- 18
- continuous web (folded)
- 20
- pulling rollers
- 22
- confronting side surfaces
- 24
- bottom edge
- 26
- vertical seal
- 26a
- leading edge
- 26b
- trailing edge
- 28
- pocket
- 30
- unsealed opening
- 31
- top edge
- 32
- pressure roll
- 34
- circumferential groove
- 36
- perforation knife
- 38
- knife counter-element
- 40
- leading sealing section
- 42
- trailing sealing section
- 44
- unsealed vertical end section
- 46
- perforation
- 48
- length piece
- 50
- longitudinal opening guide means
- 52
- central guide rail
- 54
- chamfered widening section
- 56
- parallel guide rail
- 58
- longitudinal slot
- 60
- spout wheel
- 62
- spout
- 64
- forward tip
- 65
- rotational axis of the spout wheel
- 66
- inner conveyor belt
- 66a
- lower inner conveyor belt
- 68
- outer conveyor belt
- 68a
- lower outer conveyor belt
- 68b
- upper outer conveyor belt
- 70
- discharging guide
- 72
- head sealing means
- 74
- heated bar
- 76
- sealing belt
- PI
- piercing section
- P
- pouch
- S
- separation and opening section
- F
- filling section
- O
- opening section
- C
- closing section
- D
- discharging section
- SI
- sealing section
1. A method for making pouches (P)
providing a continuous web (18);
folding the web (18) to provide confronting side surfaces (22) joined along a bottom
edge (24);
forming a vertical seal (26) between the confronting side surfaces (22), thereby providing
a series of adjacent pockets (28) having opposite side walls with each pocket having
an unsealed opening (29) along a top edge (31);
filling the pockets (28) through the unsealed opening (29) with material;
sealing the unsealed opening (29),
characterized in
that the web (18) is perforated by a perforation (46) between a leading length piece (48)
of the web (18) adapted to form a leading pocket (28) and a trailing length piece
(48) of the web (18) adapted to form a trailing pocket (28), and
that a distance between a trailing edge (26b) of the leading length piece (48) and a leading
edge (26a) of a trailing length piece (48) is increased for tearing the leading and
the trailing lengths pieces (48) apart at the perforation (46).
2. The method according to claim 1, characterized in that the continuous web (18) is perforated after the pockets (28) have been formed.
3. The method according to claims 1 or 2, characterized in that the continuous web (18) is abutted against an outer circumference of a rotating filler
wheel (2) to follow a circular path and that the leading and the trailing length pieces
(48) are torn apart while the length pieces (48) are moved on the circular path.
4. The method as defined in any of the preceding claims, characterized in that the trailing edge (26b) of a leading pocket is pierced by a trailing arm (6) of the
filler wheel (2) and that the leading edge (26a) of a trailing pocket (28) is pierced
by a leading arm (4) of the filler wheel (2) and that the leading and the trailing
pockets (28) are torn apart for forming open pouches (P) by pivoting at least one
of the leading and the trailing arms (4, 6) of the gripping unit toward the other
of the trailing and the leading arms (4, 6) of said gripping unit.
5. The method as defined in claim 4, characterized in that the continuous web (18) is pressed against the leading and the trailing arm (4, 6)
by a rotating pressure roll (32).
6. The method according to any of the preceding claims, characterized in that a longitudinal opening guide means (50) is introduced between the confronting side
surfaces (22) and through the unsealed opening (29) as the continuous web (18) is
abutted against the outer circumference of the rotating filler (2) and that the confronting
side surfaces (22) are separated from each other by the longitudinal opening guide
means (50) until a spout (62) of a spout wheel (60) has been introduced into the pocket
(28).
7. The method according to claim 6, characterized in that the leading and the trailing length pieces (48) are torn apart as the longitudinal
opening guide means (50) are received between the confronting side surfaces (22).
8. The method according to any of the preceding claims being dependent on claim 4, characterized in that after filling, the pouches (P) are closed by pivoting at least one of the leading
and the trailing arms (6) away from the other of the trailing and the leading arms
(4).
9. The method according to any of the preceding claims, characterized in that the pouches (P) are transferred from the circular path to a linear sealing path for
sealing the opening (29).
10. A packaging apparatus for making pouches (P) comprising:
feeding means for feeding a continuous web;
folding means for folding the web to provide confronting surfaces joined along a bottom
edge (24);
vertical sealing means for forming a vertical seal (26) between the confronting side
surfaces (22) at spaced intervals along the web (18), thereby providing a series of
adjacent pockets (28) having opposite side walls with each pocket having an unsealed
opening (29) along a top edge;
filling means (60, 62) for filling the pockets with a material; and
horizontal sealing means (72; 74) for sealing the opening (29),
characterized by
perforation means (36, 38) for perforating the continuous web (18) between a leading
length piece (48) of the web (18) adapted to form a leading pocket (28) and a trailing
length piece (48) of the web (18) adapted to form a trailing pocket (28), and tearing
means (4, 6) adapted to tear the leading length piece (48) and the trailing length
piece (48) apart by increasing the distance between a trailing edge (26b) of the leading
length piece (48) and a leading edge (26a) of the trailing length piece (48).
11. The packaging apparatus according to claim 10, characterized in that the filling means (60, 62) and the tearing means (4, 6) are assigned to a rotatable
filler wheel (2).
12. The packaging apparatus according to claim 10 or 11, characterized in that the filler wheel (2) comprises a plurality of leading and trailing arms (4, 6), wherein
at least one of the leading and trailing arms (6) is pivotably supported on the filler
wheel (2) and that needles (14) project a radial end phase (12) of the leading and/or
trailing arm (4, 6).