TECHNICAL FIELD
[0001] This invention relates to a flexible package bag protrusively provided with a film-shaped
one-way pouring nozzle (liquid pouring nozzle) having a self-sealing non-return function
and made from a pair of front and rear overlapping plastic films each having a laminate
film structure as well as a liquid material-filled packaging structure in which a
non-self supporting type liquid material-filled packaging body formed by packing various
kinds of liquids and the like in the above flexible package bag at a deaeration state,
for example, through an in-liquid seal-packing or the like is housed in a self-supporting
type outer package bag.
[0002] The term "in-liquid seal-packing" used herein means that a package bag body filled
with a liquid is subjected to a sealing so as to squeeze the liquid from the resulting
sealed portion without incorporating a gas such as air, nitrogen gas or the like into
the interior of the package bag.
BACKGROUND ART
[0003] As a flexible package bag provided with a liquid pouring nozzle of a self-sealing
non-return function made from plastic films or a film-shaped one-way pouring nozzle,
there are bags as disclosed in
JP-A-2005-15029 and
JP-A-2005-59958 proposed by the inventors. Since these flexible package bags are non-self supporting
type package bags made from soft laminate films, they are inconvenient in use alone
as they are and have taken a form of housing and fixing in a container as disclosed
in
JP-A-2004-196364.
DISCLOSURE OF THE INVENTION
PROBLEMS TO BE SOLVED BY THE INVENTION
[0004] The package bags disclosed in
JP-A-2005-15029 and
JP-A-2005-59958 are used as a liquid-filled packaging body in which only a liquid packing material
is substantially included by packing a liquid seasoning such as soy sauce or the like
or a liquid substance such as salad oil or the like through, for example, in-liquid
seal-packing.
[0005] Also, the liquid-filled packaging body has a characteristic that the liquid packing
material does not quite contact with air inside the package bag even when the liquid
packing material is poured. Therefore, the liquid packing material hermetically encapsulated
in the package bag has a merit that the original state can be maintained over a long
time of period because chemical change due to oxidation or the like does not occur.
[0006] In the conventional package bag, the front and rear plastic films in the film-shaped
one-way pouring nozzle are closed to each other based on the wetting with the packing
material to develop self-sealing non-return function, but also the inner surfaces
of the package bag body are closed to each other through the wetting of the liquid
packing material filled at the deaeration state in an area corresponding to a pouring
amount of the packing material to cause a contraction or collapse deformed state.
[0007] As a matter of fact, it has been confirmed that smooth pouring may be sometimes obstructed
due to the strong closing force between the above front and rear films in subsequent
pouring of the liquid packing material from the package bag.
[0008] In the conventional package bag, only the liquid packing material is basically filled
in the package bag by deaeration packing such as in-liquid seal-packing or the like.
However, there are sometimes caused a case that the complete filling can not be conducted
at a gas-less state and a case that a gas included in the packing material is generated
after the filling and retains in the bag, and hence it has been confirmed that such
a gas may be feared of obstructing the non-return function of the film-shaped one-way
pouring nozzle.
[0009] Also, the conventional packaging structure disclosed in
JP-A-2004-196364 has a problem that since it is required to place the non-self supporting type flexible
package bag filled with the packing material into a paper box and fasten thereto,
the production steps including the boxing are cumbersome and the cost becomes higher.
[0010] It is, therefore, an object of the invention to solve the aforementioned problems
inherent to the conventional techniques and to propose a non-self supporting type
flexible package bag particularly provided with a film-shaped one-way pouring nozzle
having excellent non-return functioning property and liquid cutting property but also
an excellent pouring property of a liquid packing material as a filled substance (the
packing material in the bas can be poured smoothly until the end.
[0011] It is another object of the invention to propose a liquid-filled packaging structure
capable of maintaining the non-self supporting type flexible package bag at a use
state as it is.
MEANS FOR SOLVING PROBLEMS
[0012] The inventors have made various studies in order to achieve the above objects and
discovered an inventive construction having the following summary and constitutions.
That is, the invention proposes a flexible package bag comprising a package bag main
body formed by seal-joining front-side and rear-side flexible laminate films, and
a film-shaped one-way pouring nozzle protruded from a side portion of the package
bag body and formed by closing a pair of overlapping plastic films to each other in
the presence of a liquid packing material, characterized in that at least an upper
part of a non-sealed portion of at least one of the front-side and rear-side laminate
films in the package bag main body or a part thereof in the vicinity of a side edge
of the film-shaped one-way pouring nozzle is constructed with a laminate film having
irregular inner surfaces.
[0013] In the flexible package bag according to the invention, more preferable embodiments
are as follows:
- (1) The irregular inner surface formed in the laminate film is formed in a partial
or full pattern by subjecting to embossing, blasting, knurling, wrinkling, or vertical-horizontal
striping in the form of plane, island or stripe;
[0014] (2) The film-shaped one-way pouring nozzle is formed by fusing two overlapping soft
plastic films to each other at a peripheral edge portion other than a portion corresponding
to a base end portion of the nozzle so as to constitute a central portion thereof
as a pouring path and integrally uniting with the package bag main body, and generates
a non-return function blocking penetration of ambient air by a closing action between
mutual inner faces of the plastic films based on a fact that when the package bag
main body is tilted to pour a liquid packing material therefrom, the pouring path
is rendered into a wet state due to the passing of the liquid packing material to
attach the liquid packing material to the inner face of the pouring path;
[0015] (3) The film-shaped one-way pouring nozzle has an irregular inner surface in at least
one of the front-side and rear-side overlapping plastic films at a side of a base
end portion of the nozzle other than a predetermined tearing position of the nozzle
and a vicinity thereof;
[0016] (4) At the base end portion of the film-shaped one-way pouring nozzle are temporarily
fused opposite sealant layers of the overlapping plastic films at a lower temperature
to temporarily seal the inner face of the pouring path; and
[0017] (5) The package bag main body has a gas reserving space at a position of an upper
and side sealing portion thereof higher than an upper edge of the film-shaped one-way
pouring nozzle.
[0018] Furthermore, the invention lies in a liquid material-filled packaging structure comprising
a non-self supporting type liquid material-filled packaging body formed by deaeration-packing
a liquid or viscous packing material into a non-self supporting type flexible package
bag comprised of a package bag main body formed by seal-joining front-side and rear-side
flexible laminate films and a film-shaped one-way pouring nozzle protruded from a
side portion of the package bag main body and formed by closing a pair of overlapping
plastic films to each other in the presence of a liquid packing material, wherein
at least an upper part of a non-sealed portion of at least one of the front-side and
rear-side laminate films in the package bag main body or a part thereof in the vicinity
of a side edge of the film-shaped one-way pouring nozzle is constructed with a laminate
film having irregular inner surfaces, and a self-supporting type outer cylindrical
packaging vessel for housing the non-self supporting type liquid material-filled packaging
body which is provided at its one-side portion with tear-guide perforations for nozzle
drawing for exposably housing the film-shaped one-way pouring nozzle and exposing
a tip portion of the nozzle to protrude an openable overhang small bag and dispose
a self-supportable bottom plate.
[0019] In the liquid-filled packaging structure, more preferable embodiments are as follows:
- (1) The irregular inner surface formed in the laminate film is formed in a partial
or full pattern by subjecting to embossing, blasting, knurling, wrinkling, or vertical-horizontal
striping in the form of plane, island or stripe;
[0020] (2) The film-shaped one-way pouring nozzle is formed by fusing two overlapping plastic
films to each other at a peripheral edge portion other than a portion corresponding
to a base end portion of the nozzle so as to constitute a central portion thereof
as a pouring path and integrally uniting with the package bag main body, and generates
a non-return function blocking penetration of ambient air by a closing action between
mutual inner faces of the plastic films based on a fact that when the package bag
main body is tilted to pour a liquid packing material therefrom, the pouring path
is rendered into a wet state due to the passing of the liquid packing material to
attach the liquid packing material to the inner face of the pouring path;
[0021] (3) The film-shaped one-way pouring nozzle has an irregular inner surface in at least
one of the front-side and rear-side overlapping plastic films at a side of a base
end portion of the nozzle other than a predetermined tearing position of the nozzle
and a vicinity thereof;
[0022] (4) At the base end portion of the film-shaped one-way pouring nozzle are temporarily
fused opposite sealant layers of the overlapping plastic films at a lower temperature
to temporarily seal the inner face of the pouring path;
[0023] (5) The package bag main body has a gas reserving space at a position of an upper
and side sealing portion thereof higher than an upper edge of the film-shaped one-way
pouring nozzle;
[0024] (6) The non-self supporting liquid-filled packaging body is housed and kept in the
self-supporting type outer package bag at a suspended state by fusing a horizontal
seal portion at an upper end part of the packaging body to an upper end portion of
the outer package bag; and
[0025] (7) The self-supporting outer cylindrical packaging vessel has a flat bottom portion
at its lower end portion and is a flexible package bag made from an openable soft
laminate film for exchanging the non-self supporting type liquid material-filled packaging
body.
EFFECT OF THE INVENTION
[0026] According to the invention, by adopting a novel construction in the flexible package
bag provided with a one-way pouring nozzle or a film-shaped one-way pouring nozzle
having a self-sealing non-return function can be removed quality-deteriorating factors
such as oxidation of a packing material filled through in-liquid seal-packing (which
is basically packed so as to be only a liquid packing material at a gas-less state)
and the like. Also by rendering at least a part of the soft laminate film constituting
the package bag main body into the irregular inner surface can be always conducted
rapid pouring smoothly in the repouring and the like.
[0027] According to the invention, the pouring can be conducted smoothly by the addition
of the irregular inner surfaces formed on the package bag main body, while back-flowing
of ambient air and the like into the bag (air flows into the package bag instead of
pouring the packing material) can be surely prevented even after the film-shaped one-way
pouring nozzle is torn at a given position (the package bag is opened), and hence
the packing material retaining in the bag can be kept at a fresh state over a long
time.
[0028] Also, according to the invention, the temporary sealing structure is adopted in the
inner surface of the base end portion of the nozzle by the temporary fusing treatment
at a lower temperature, whereby there can be provided a flexible package bag provided
with a film-shaped one-way pouring nozzle without blocking the non-return functioning
property by handling or the like.
[0029] Further, by giving the irregular inner surfaces to the side of the film base end
portion in the film-shaped one-way pouring nozzle other than at least tear opening
portion and the vicinity thereof can be provided a package bag having an excellent
pouring property as a whole of the flexible package bag.
[0030] According to the invention, the non-self supporting type liquid-filled packaging
body formed by deaeration-packing a liquid material into the non-self supporting type
flexible package bag through the in-liquid seal-packing is housed in an outer package
vessel such as a self-supporting type flexible package bag made from a soft laminate
film (standing pouch: outer bag) preferably at a state capable of exchanging the used
bag with a new bag without placing into a hard package, whereby the packaging body
can be applied to a use form as it is but also the pouring of the liquid packing material
can be stabilized.
[0031] Moreover, according to the invention, the liquid-filled packaging body obtained by
in-liquid seal-filling the packing material into the flexible package bag main body
having the film-shaped one-way pouring nozzle can be supported and stabilized by fixing
its upper portion to an upper portion of the outer packaging vessel and can conduct
the stable pouring of the packing material. Also, the invention is simple in the production
and contributes to the reduction of the production cost.
BRIEF DESCRIPTION OF THE DRAWINGS
[0032] Fig. 1 is a front view illustrating an embodiment of the flexible package bag according
to the invention;
Fig. 2 is a schematic view illustrating an irregular working area in the flexible
package bag according to the invention;
Fig. 3 is an enlarged section view of a predetermined position of an opening in a
film-shaped one-way pouring nozzle;
Fig. 4 is a front view illustrating a state of disposing a coating layer on a film-shaped
one-way pouring nozzle;
Fig. 5 is a perspective view illustrating an embodiment of the liquid-filled packaging
body according to the invention;
Fig. 6 is a front view illustrating an embodiment of the liquid-filled packaging structure
according to the invention; and
Fig. 7 is a front view illustrating another embodiment of the liquid-filled packaging
structure according to the invention
EMBODIMENTS OF THE INVENTION
[0033] The flexible package bag according to the invention comprises a package bag main
body made from a soft laminate film having, for example, two or three layer laminate
structure and a film-shaped one-way pouring nozzle (liquid pouring nozzle as disclosed
in
JP-A-2005-59958) fused at an upper part of either side edge portion of the main body at a state of
protruding therefrom in a transverse direction, an obliquely upward direction or the
like or previously united integrally with the package bag main body and basically
formed by oppositely superposing two soft and thin plastic films (pair of front and
rear films) in which the pouring path formed between two mutually superposed films
is closed due to the interposition of the liquid material attached by the capillary
action to develop the non-return function.
[0034] The film-shaped one-way pouring nozzle being a characteristic construction in the
flexible package bag according to the invention is constituted, for example, by fusion-joining
a nozzle base end portion to an inner surface of an upper side portion (sealant layer)
of the package bag main body through a sealant layer as an outermost layer of the
plastic film constituting the nozzle to communicate the pouring path disposed in the
central portion of the pouring nozzle with the inside of the bag main body.
[0035] For example, the pouring nozzle is formed by fusion-bonding front-side and rear-side
plastic films each comprising a uniaxially or biaxially oriented base film layer and
inner and outer sealant layers sandwiching it from front and rear sides, for example,
opposite sealant layers in the pair of the plastic films or opposed sealant layers
of the single plastic film folded in a half width at a peripheral portion other than
a base end portion with each other in the form of substantially a wedge shape as a
whole so as to provide a pouring path not fused in a central portion thereof.
[0036] Typically, the film-shaped one-way pouring nozzle has a protruding length from the
package bag body X of about 30-100 mm and a nozzle top width Y of about 20-80 mm.
For instance, the package bag main body is dependent upon the weight of the packing
material but generally uses a thick and chewy laminate film made of two layers of
NY 15 µm/PE 60 µm, whereas the film-shaped one-way pouring nozzle is not subjected
to loading of the packing material and is preferable to be a thin laminate plastic
film having a three layer structure of PE 20 µm/NY 15 µm/PE 20 µm. The thinner the
thickness of the low-chewy plastic film, the better the non-return function.
[0037] The pair of front and rear superposed plastic films provide a higher non-return effect
as the flatting property (flatness) becomes higher.
[0038] Such a film-shaped one-way pouring nozzle can be made by fusion-bonding peripheral
edge portions of sealant layers in the pair of two superposed and laminated plastic
films (opposing at front and rear sides), which are suitably made, for example, from
polyethylene layer, polypropylene layer, ethylene vinyl alcohol (EVA), ionomer, EVOH
or the like, other than a portion being a base end portion so as to provide a desired
shape (wedge shape) through heat sealing, high frequency sealing, impulse sealing
or the like.
[0039] The thus obtained film-shaped one-way pouring nozzle made of the plastic film having
a laminate structure of, for example, three layers (sealant layer - base film layer
- sealant layer) is attached at a state of protruding from the package bag main body
by fusion-bonding the sealant layer as an outer surface of the base end portion thereof
to the sealant layer (preferably, sealant layer of the same kind film) as an inner
surface of an opening portion formed at one side portion of the package bag main body
made from the soft laminate film (mainly two layers) through heat sealing.
[0040] In this way, there is obtained a flexible package bag provided with the film-shaped
one-way pouring nozzle protruding outward from an upper part, top part or the like
at the side portion of the package bag main body.
[0041] When the outer surface of the base end portion in the film-shaped one-way pouring
nozzle is fusion-joined to the inner surface of the opening portion in the side portion
of the package bag main body, in order to prevent non-intended mutual fusion between
the sealant layers in the inner face of the film-shaped one-way pouring nozzle, it
is preferable that a releasing sheet having a higher melting point or not fusion thermally
is inserted into an inside of the base end portion of the nozzle connecting to the
pouring path or the fusing temperatures of the sealant layers at the inner and outer
surfaces of the nozzle are made different to each other, for example, by the change
of the material or by changing extrusion laminating conditions so that the melting
point of the sealant layer film in the inner surface of the nozzle is made higher
than that of the sealant layer film in the outer surface of the nozzle, and it is
more preferable to be higher by 20-30°C.
[0042] For instance, as the sealant film of inner surface side (rear side) is desirable
a film of a thermoplastic resin such as polypropylene, polyethylene or the like and
having a melting point higher by about 20°C than a melting point of the outer surface
side (front side) material. Also, as the sealant film of outer surface side (front
side) a film capable of heat-sealing at a temperature higher than the heat-sealing
temperature of the sealant layer in the package bag body is preferable. This is due
to the fact that the heat sealing between the mutual sealant films at the inner surface
of the film-shaped one-way pouring nozzle is prevented when the film-shaped one-way
pouring nozzle is fusion-joined to the bag main body through heat sealing.
[0043] At this moment, it is preferable that the packing of a liquid such as soy sauce or
the like, a liquid seasoning containing a solid substance such as sesame or the like,
soup or other liquid packing material (it is possible to incorporate biggish solids
into such a liquid) is conducted at the step of joining (heat-sealing) the film-shaped
one-way pouring nozzle to the package bag main body or after the joining step.
[0044] Such a packing of the liquid material is conducted, for example, by the in-liquid
seal-packing (the in-liquid seal-packing is carried out without incorporating air,
nitrogen gas or the like) or by discharging gas inside the bag after the filling of
the packing material to conduct deaeration-packing of sufficiently removing the gas
from the inside of the package bag main body. Because, it is necessary to airtightly
seal the packing material inside the bag at a deaeration sealed state for sufficiently
developing the non-return function of the film-shaped one-way pouring nozzle and also
it is preferable to prevent oxidation or the like of the packing material.
[0045] The pouring of the liquid packing material packed in the flexible package bag is
carried out by cutting a predetermined opening portion formed in the vicinity of the
top end portion of the film-shaped one-way pouring nozzle (top end side from a position
of forming tear-guide perforations or notches). That is, after the opening of the
nozzle, the required pouring of the packing material is conducted by tilting the main
body of the liquid-filled packaging body so as to be a downward posture of the nozzle
opening (pouring port).
[0046] In this case, the film-shaped one-way pouring nozzle made from the soft laminate
plastic films separates away toward front and rear sides based on the action of water
head pressure of the packed material or pressurization of hand and fingers to a base
portion of the liquid-filled packaging body to allow for the pouring of the packing
material.
[0047] Moreover, when the packing material is poured through the nozzle opening (pouring
port) of the film-shaped one-way pouring nozzle, the package bag main body made from
the soft laminate films does not perform intake of ambient air based on the non-return
function inherent to the film-shaped one-way pouring nozzle irrespectively of the
pouring of the packing material, so that the package bag main body is shrunk or collapse-deformed
by a quantity corresponding to the poured volume.
[0048] Thus, the liquid-filled packaging body formed by packing the liquid material into
the flexible package bag can pour a required quantity of the packing material from
the bag by tilting the pouring nozzle under an opening thereof. The pouring of the
packing material from the nozzle opening is stopped by restoring the packaging body
to the original standing posture. Since the inside of the pouring path in the film-shaped
one-way pouring nozzle is at a state wetted with the liquid packing material attached
thereto by the stop of the pouring, the opposed plastic films at the inner surface
of the pouring nozzle are strongly closed to each other through the capillary action,
and hence the nozzle opening disposed on the top end portion of the nozzle is at a
closed state, whereby the invasion of ambient air into the inside of the package bag
main body can be blocked surely.
[0049] In the package bag provided with such a film-shaped one-way pouring nozzle, the liquid
material packed in the bag is protected at a state of completely blocking ambient
air even before, during and after the pouring, whereby the oxidation, contamination
and the like of the packing material inside the bag are prevented effectively.
[0050] As the film construction of the package bag main body according to the invention,
the base film layer located at the outer surface thereof and the sealant layer located
at the inner surface may be the same kind as in the base film layer and sealant layer
of the film-shaped one-way pouring nozzle.
[0051] However, when the film-shaped one-way pouring nozzle and the package bag main body
are formed separately, the film construction of the package bag body is different
from the film for the nozzle, wherein a middle layer may be interposed between the
base film layer and the sealant layer.
[0052] Preferably, the sealant layer constituting the inner surface of the package bag main
body made from the soft laminate film is made from the same resin material as in the
outermost sealant layer of the pouring nozzle. Thus, the fusion-joining strength of
the pouring nozzle to the package bag main body can be enhanced sufficiently.
[0053] Moreover, when the package bag main body is made from a laminate film of two- or
three-layer structure, it is preferable that the uniaxially or biaxially oriented
base film layer in the laminate film is constituted with a polyethylene terephthalate
film layer (PET layer), nylon resin film layer (NY layer) or ethylene vinyl alcohol
(EVOH) or the like having a thickness of 8-30 µm.
[0054] Also, the sealant layer of the laminate film used in the package bag main body may
be constituted with a non-oriented PE layer, PP layer, EVA layer, ionomer layer, EVOH
layer or the like having a thickness of 10-60 µm.
[0055] When the thickness of the base film layer is less than 8 µm, there is a fear that
steam impermeability, gas barrier property and the like become lacking, while when
it exceeds 30 µm, the bending strength of the laminate film is too large, and hence
there is a fear that the adhesion between the inner surfaces in the nozzle is damaged
after the pouring stop of the packing material.
[0056] On the other hand, when the thickness of the sealant layer is less than 10 µm, it
is feared that the sufficient sealing strength can not be ensured, while when it exceeds
60 µm, there is a fear that the bending strength of the laminate film becomes too
large. Moreover, the sealant layer may be constituted with two or more layers as long
as the thickness of the sealant layer is within the above range in total.
[0057] As the laminate film used in the package bag main body are required chewy ones because
a constant quantity of liquid material is filled thereinto. In the invention, it is
preferable that the bending strength per unit width (15 mm), or nerve of the laminate
film is about 40-300 mN as a value measured using a nerve measuring device as disclosed
in Fig. 10 of
JP-A-2005-59958. When the nerve is less than 40 mN, the stability of the pouring direction or the
like in the pouring of the packing material from the package bag is poor but also
the chewy feeling of the package bag main body is weak and there is a fear that shortage
in the strength of the package bag itself is actualized. While, when it exceeds 300
mN, there is a fear that the non-return function of the whole including the film-shaped
one-way pouring nozzle is deteriorated irrespectively of the lamination structure
of the laminate film.
[0058] In the flexible package bag according to the invention formed by protruding the film-shaped
one-way pouring nozzle from the package bag main body having such a film construction,
it is desirable that the pouring of a controlled and predetermined quantity can be
made smoothly even in repetitive pouring case, particularly re-pouring case likewise
the first pouring case.
[0059] In the invention, therefore, as shown in Fig. 1, a portion of at least one of front-side
and rear-side laminate films in at least package bag main body 2 other than a seal
portion of the bag (lateral seal, vertical seal, joint seal between nozzle and main
body) is used to have irregular inner surfaces 14 formed by subjecting to embossing,
blasting, knurling, wrinkling, or vertical-horizontal striping. The reason why the
seal portion is removed is due to the fact that poor sealing is caused if irregularity
is existent in the seal portion.
[0060] The reason why the irregular inner surfaces are formed in the package bag body is
mainly as follows. That is, in the flexible package bag according to the invention,
after the liquid packing material is poured through the film-shaped one-way pouring
nozzle, both the front-side and rear-side laminate films are strongly closed to each
other (non-return action) not only by the non-return function of the film-shaped one-way
pouring nozzle but also by preventing the penetration of ambient air into the inside
of the package bag main body (back flow) to cause capillary action between these laminate
films under interposition of the liquid material. Particularly, the package bag body
becomes at a state of generating the shrinkage of the film or collapse deformation
of the bag main body by a volume corresponding to the amount of the liquid material
poured.
[0061] As a result, when the liquid packing material filled is again poured through the
film-shaped one-way pouring nozzle, if sufficient liquid quantity (liquid height)
is existent in the package bag main body (hydraulic pressure is large), smooth pouring
is compensated to a certain level, but as the quantity of the liquid in the bag becomes
small, the hydraulic pressure becomes small and hence the pouring pressure is get
beaten by the closing force between the laminate films to obstruct the smooth pouring
or liquid returning.
[0062] In the flexible package bag according to the invention, as the amount of the liquid
in the bag becomes small, wrinkles are generated in the package bag main body to form
a dam, and as a result, the liquid flow is stagnant and the path of the liquid is
shielded to make the smooth pouring difficult. In this case, if a pressure applied
to the bag body is increased, there is caused a fear of discharging the unintended
excessive amount and the stable pouring can not be ensured.
[0063] According to the invention, in order to remove these bad effects, the closing force
between the laminate films in the package bag main body at least based on the longitudinal
and horizontal capillary actions in the vicinity of the film-shaped one-way pouring
nozzle is somewhat alleviated to prevent the backset, stagnation and clogging of the
liquid flow to thereby ensure the path.
[0064] That is, the closing force caused in the pouring path of the film-shaped one-way
pouring nozzle and in the package bag main body through the capillary action is alleviated
without deteriorating the non-return action of the film-shaped one-way pouring nozzle.
For this end, according to the invention, at least one of the overlapped front and
rear laminate films in the package bag main body is subjected to embossing, blasting
or the like to form irregular inner surface, whereby the capillary action is eliminated
or weakened.
[0065] The closing force based on the capillary action is caused when the gap between the
front and rear laminate films in the package bag main body (other than longitudinal
seal, horizontal seal and joint sealing portion between the nozzle and the main body)
or thickness of liquid layer is typically about 2-5 µm. According to the invention,
as the irregular inner surface to be formed in the laminate film, irregularity is
given so as to render the gap between the mutual films into not less than 20 µm, preferably
not less than 30 µm, more preferably not less than 50 µm, for example, by subjecting
one or both of the laminate films to embossing.
[0066] In this case, the capillary action is eliminated completely or weakened, resulting
in the decrease of the closing force between the laminate films. As a result, at least
places provided with the irregular inner surface are at a state of constantly ensuring
the flow path. Even if the amount of the liquid in the bag is extremely small, the
smooth pouring of the liquid packing material along the irregular inner surface 14
is ensured constantly.
[0067] The irregular work is preferable to be carried out by using an emboss roll of a cylindrical
or rectangular form having irregular pattern (
JP-A-2008-12669) or the like to give irregular pattern in addition to regular pattern.
[0068] Also, the irregular inner surface 14 may be realized even by subjecting to random
wrinkle working, blasting, knurling, longitudinal and horizontal striping or the like
instead of the embossing as desirable irregularity. These irregularities are desirable
to be combined by shifting the irregular positions from each other so as to form a
gap of not less than 20 µm between the opposed laminate films.
[0069] For example, these irregularities can be formed with hot rolls (70-80°C) in a bag-forming
machine before the formation of the bag (before the longitudinal seal) or after the
formation of the bag.
[0070] The inventors conducted an experiment that soy sauce is filled as a packing material
in a package bag main body having a laminate film structure of TECKBARRIER NY 15 µm
deposited face/deposited face TECKBARRIER PET 12 µm/XA-HD 40 µm through in-liquid
seal packing and then the package bag main body or liquid filled package bag is tilted
till the liquid is not poured to measure a remaining liquid amount. As seen from the
results shown in Table 1, in case of using the laminate film subjected to irregular
work, the remaining amount in the bag is smallest and the effect is remarkable.
[0071] In this experiment, a case of forming irregular pattern and a case of forming longitudinal
stripe pattern on the package bag main body in the vicinity of the film-shaped one-way
pouring nozzle through the embossing are compared with a package bag main body not
subjected to irregular work.
[0072] As a result, in the cases adaptable to the invention, the amount of the packing material
in the bag is less and can be finished up until the end, and the pouring is smooth.
[0073]
Table 1
Package bag main body |
Remaining amount of soy sauce (g) |
not worked |
48.7 |
longitudinal stripe pattern |
24.7 |
embossed pattern |
30.1 |
[0074] According to the invention, when the irregular inner surface is formed as one to
plural patterns in at least a part or an upper part of a non-seal portion of the package
bag main body or in a longitudinal direction along a side edge facing to the film-shaped
one-way pouring nozzle, it is effective for ensuring the path in the re-pouring. Also,
various patterns as exemplified in Figs. 2(a)-(f) are effective, and they are formed
in the form of a partial pattern or full pattern as a face, island or stripe.
[0075] A concrete form of the flexible package bag according to the invention will be described
with reference to the drawings below.
[0076] The flexible package bag shown in Fig. 1 is an example that a film-shaped one-way
pouring nozzle 1 is protruded, for example, from an upper part of a left-side edge
in a package bag main body 2 made from a soft laminate film. To a sealant layer side
an inner surface in a joint portion of the bag main body 2 is fusion-joined an outermost
sealant layer at a base end portion of the film-shaped one-way pouring nozzle 1, preferably
a sealant layer made from the same resin material as the sealant layer of the package
bag body 2 through heat-sealing.
[0077] As the case may be, a sealant resin at the inner surface of the pouring path in the
film-shaped one-way pouring nozzle 1 is a high melting point resin and it is preferable
that a portion corresponding to the fusion-joined portion between the bag body 2 and
the film-shaped one-way pouring nozzle 1 is temporarily fused at a low temperature
to form a temporary sealing portion 12.
[0078] The film-shaped one-way pouring nozzle 1 can be constructed mutually fusing a pair
of front-side and rear-side disposed three-layer laminate plastic film, each of which
comprising a thermoplastic base film layer such as biaxially oriented PET or NY layer
of 5-40 µm, preferably 10-30 µm in thickness and sealant layers laminated on both
surfaces of the base film layer such as non-oriented PE or PP layer of 5-80 µm, preferably
10-60 µm in thickness, i.e. a pair of front and rear laminate plastic films having
the same profile form such as wedge form or the like or the single laminate plastic
film folded at its central portion toward front and rear sides to each other as shown
by oblique lines in the figure so as to join side portions other than a base end side
at an opposite postures of inner surface sealant layers, preferably through heat sealing.
[0079] As shown in FIG. 1, it is preferable that the film-shaped one-way pouring nozzle
1 is provided at a predetermined tear-opening position of an upper edge portion thereof
with tear guide perforations 1a made from opening means such as 1-notch, V-notch,
U-notch, base notch, diamond cut or the like. The nozzle is made to a use state by
opening the tear guide perforations 1a.
[0080] Also, it is preferable that a spiry projection 1b for prevention of liquid dripping
is disposed at a position somewhat biased from the predetermined opening position
of the lower edge portion of the film-shaped one-way pouring nozzle 1 toward the base
end portion thereof. This projection 1b can more effectively prevent the flowing down
of the liquid dripping generated at the opening end of the one-way pouring nozzle
from the lower edge portion of the one-way pouring nozzle 1 to the package bag body
2.
[0081] The film-shaped one-way pouring nozzle 1 can be manufactured simply and quickly by
mutually fusing front and rear laminate plastic films 3,4 as shown in FIG. 3 by an
enlarged section view taken along a III-III line of FIG. 1 in a widthwise direction
of the nozzle, each having a three-layer structure comprising base film layers 5,
5' and sealant layers 6, 6', 7, 7' laminated on both surfaces of the base film layer
5, 5' so that the sealant layers 6, 6' facing to each other at the inner face sides
are fused in their peripheral portions other than a base end side at a given width,
for example at a width of 0.5-3.0 mm, preferably 1.0-2.0 mm so as to shape into a
required form (wedge form) through, preferably, heat sealing.
[0082] It is preferable that the film-shaped one-way pouring nozzle 1 is formed by laminating
flat sheets as far as possible for giving the excellent non-return function.
[0083] At the base end portion of the nozzle, the sealant layers 7, 7' located at the outer
face side are fused to the inner face of the package bag body 2 (sealant layers) through,
preferably, heat sealing, whereby the nozzle can be joined to the package bag body
2 adequately, surely and simply.
[0084] It is preferable that a coating layer of a water repellant agent or an oil repellant
agent (water-repellant, oil-repellant coating layer) 10 for preventing liquid dripping
to improve liquid cutting property is provided on the outer surface of the film-shaped
one-way pouring nozzle 1 or an outer surface extending from the predetermined tear
lines (predetermined opening portion) of the outer sealant layers 7, 7' toward the
side of the base end portion along at least opening end and lower edge portion as
shown by dotted lines in Fig. 4.
[0085] Further, it is preferable that wet-treated layers 18, 18' for promoting the non-return
function are disposed on the inner faces of the inner sealant layers 6, 6' in the
film-shaped one-way pouring nozzle 1, particularly the inner faces of portions forming
the pouring path 13.
[0086] As shown in FIG. 1, the film-shaped one-way pouring nozzle 1 having the above construction
is protruded laterally from the upper end portion of the package bag body 2 made of
soft laminate films, for example, by fusion-joining the outer sealant layers 7, 7'
in the base end portion of the nozzle 1 to the inner surfaces of the package bag body
2 at the mutually fused portions of the sealant layers side the deaeration packing
of the package bag body 2 and the like to integrally unite with the package bag at
the same time of deaeration-packing the packing material into the package bag body
through in-liquid seal packing or prior to the in-liquid seal packing of the packing
material or the like.
[0087] Moreover, in the liquid-filled packaging body 8 according to the invention, it is
required that the liquid packing material is deaeration-packed through in-liquid seal
packing or the like so as not to leave gas in the bag in view of developing the self-seal
non-return function of the film-shaped one-way pouring nozzle 1.
[0088] In some cases, a slight amount of ambient air may be invaded into the package bag
during the pouring, and gas involved in the packing material itself may be generated
ex-post. In order to reserve these gases to ensure the one-way pouring of the film-shaped
one-way pouring nozzle, it is preferable that one or more gas reserving spaces 11
as shown in Figs. 1 and 4 are disposed in an upper part of the package bag main body
2 or an upper lateral seal portion located above the film-shaped one-way pouring nozzle
1, if necessary.
[0089] Into such a flexible package bag is deaeration-packed the liquid packing material,
preferably, through the in-liquid seal packing to form the liquid-filled packaging
body 8 of a distended form as shown in FIG. 5. However, the soft, flexible package
bag itself typically does not have a self-standing property or a fixing property,
so that it is preferable that the bag is housed in a self-standing outer package bag
9 (a hard vessel or a standing pouch) as shown in FIG. 6 and mentioned in detail later
to bring about the self-standing property and the fixing property so as to render
into use form in case of transporting, storing, displaying, using the packing material
and the like.
[0090] In the latter case, the pouring is carried out making a tilting angle of the self-standing
type outer package bag (mentioned in a case of "standing pouch" hereinafter) 9 large
in accordance with the reduction of the packed material in the bag.
[0091] The use of the flexible package bag is conducted by tearing or cutting the top end
side of the predetermined tear portion of the film-shaped one-way pouring nozzle 1
to ensure the nozzle opening or pouring port and then pouring the liquid packing material
inside the flexible package bag from the pouring port formed in the film-shaped one-way
pouring nozzle 1 at a posture of tilting the standing pouch 9 without invasion and
suction of ambient air. On the other hand, the invasion of ambient air into the inside
of the package bag body 2 is surely obstructed by restoring the standing pouch 9 to
the standing position to stop the pouring and closely adhering the inner faces of
the film-shaped one-way pouring nozzle 1 over the whole thereof in the presence of
a liquid film made from the liquid packing material wetting the inner faces in association
therewith.
[0092] Thus, the package body obtained by deaeration-packing the liquid packing material
into the package bag body 2 through in-liquid seal packing can pour the packing material
corresponding to a quantity to be poured under a shrunk or collapsed deformation without
taking ambient air into the inside of the package bag body 2. After the pouring stop
of the packing material, the invasion of ambient air into the package bag body 2 is
prevented by the closing seal of the inner faces in the pouring path of the film-shaped
one-way pouring nozzle 1 owing to its non-return function, whereby contamination,
oxidation or the like of the packing material retaining in the package bag body 2
through ambient air can be prevented sufficiently.
[0093] After the required quantity of the liquid packing material is poured, the pouring
port located at the top portion of the film-shaped one-way pouring nozzle 1 is automatically
closed, and the standing pouch as a self-standing type outer package bag is restored
to the standing posture under such a state.
[0094] As previously mentioned, the closing seal of the film-shaped one-way pouring nozzle
1 producing the non-return function is conducted by releasing the film-shaped one-way
pouring nozzle 1 from water head pressure to restore the front and rear laminate films
3, 4 to the original form in the production of the film-shaped one-way pouring nozzle
1 and placing the front and rear plastic films 3, 4 in an atmosphere of a reduced
pressure when the packing material inside the film-shaped one-way pouring nozzle is
flown back to the package bag body 2 to thereby adsorb the inner faces (sealant layers
6, 6') of the soft plastic films 3, 4 to each other through a capillary action over
a full nozzle width in the presence of the liquid packing material attached to these
faces, and so on.
[0095] The mutual closing between the films based on such a self-seal non-return function
is maintained more surely when the package bag body 2 after the collapse deformation
or the like tends to reduce the interior of the package bag body 2 based on its elastic
restoring force.
[0096] Also, the invention proposes a liquid material-filled packaging structure wherein
a liquid packing material is filled into the aforementioned flexible package bag having
no self-standing property nor shapable property to form a liquid material-filled packaging
body 8 of a use state as it is.
[0097] That is, the flexible package bag provided with the aforementioned film-shaped one-way
pouring nozzle protruded is made from a soft laminate film as a raw material and has
no self-standing property even if the packing material is filled thereinto, so that
in order to use the bag as it is, it is necessary to combine with the other self-standing
type vessel or standing pouch 9 in use.
[0098] In the film-shaped one-way pouring nozzle 1 used in the invention, it is preferable
that the outer sealant layer is made to a low melting point and the base end portion
thereof is fusion-joined to the inner sealant layer of the package bag body 2 at a
posture of protruding from the side portion of the soft package bag body 2, mostly
the side portion of its upper end part, while the inner sealant layer of the film-shaped
one-way pouring nozzle 1 is made to a high melting point and forms a temporarily sealed
portion 12 of a state of temporarily fusing at a relatively low temperature and at
an adhesion strength corresponding to a half or less than of its heat-sealing strength,
for instance, when the base end portion of the one-way pouring nozzle 1 is fusion-joined
at its pouring nozzle 1 to the inner face of the package bag main body 2.
[0099] At this moment, the temporarily sealed portion 12 through a low-temperature temporary
fusion can be realized by reducing at least one of a heating temperature, pressurizing
pressure and pressurizing time in the heat-sealing means as compared with the case
of forming a complete fusion-joint portion.
[0100] In the formation of the temporarily sealed portion 12, the forming position may be
a position corresponding to a fusion-joining position of the film-shaped one-way pouring
nozzle 1 to the package bag body 2 but also may be a position somewhat biased from
the corresponding position toward the inside of the package bag body 2 or inversely
a position somewhat biased from the corresponding position toward the inside of the
package bag body. In any cases, it is necessary that a portion forming the pouring
path for the packing material having a length (about 5-8 mm) enough to develop the
function inherent to the film-shaped one-way pouring nozzle is retained outside the
low-temperature temporarily fused portion or temporarily sealed portion 12.
[0101] Further, in the formation of the temporarily sealed portion 12, it is required to
use a high melting point sealant layer and a low melting point sealant layer in the
film-shaped one-way pouring nozzle 1, but these sealant layers are preferable to be
made from a low density polyethylene containing a straight, low density polyethylene,
or it is preferable that the high melting sealant layer is made from a middle density
or high density polyethylene and the low melting sealant layer is made from a low
density polyethylene.
[0102] Moreover, the selection of high and low melting points in the same material of polyethylene
can be realized, for example, by mutually changing extrusion laminating conditions
and the like in the lamination of the sealant layers.
[0103] The temporarily sealed portion 12 as mentioned above is disposed in the base end
portion of the film-shaped one-way pouring nozzle at the fusion-joining position of
the film-shaped one-way pouring nozzle 1 to the package bag body 2 or its vicinity.
Thus, the flowing of the liquid packing material filled in the package bag toward
the top of the nozzle from the temporarily sealed portion 12 is prevented surely.
Even if the packing material is heated to 50-100°C, a greater part of the pouring
path for the packing material in the film-shaped one-way pouring nozzle 1 is sufficiently
protected from the permanent deformation of inflating the pouring path.
[0104] Therefore, the top portion from the temporarily sealed portion 12 in the film-shaped
one-way pouring nozzle 1 can always develop the function of the film-shaped one-way
pouring nozzle sufficiently. That is, when the packing material is poured from the
package bag, the invasion of ambient air into the interior of the package bag body
can be prevented sufficiently, while the self-seal non-return function in the pouring
stop of the packing material can be surely developed.
[0105] When the packing material after the cooling to about room temperature in the bag
is poured from the package bag, the temporarily sealed portion 12 is opened by applying
a load to the package bag in a thickness direction but also the top end portion of
the film-shaped one-way pouring nozzle is broken or cut to form a pouring port, and
the package bag is tilted under such a state to render the pouring port into a downward
directing posture.
[0106] Moreover, the fusion-joined portion of the package bag other than the temporarily
sealed portion 12 is heat-sealed at a strength higher by 2 times or more than that
of the temporarily sealed portion 12, so that accidental breakage is never caused
even when applying a load required for opening the temporarily sealed portion 12.
[0107] Thus, the portion of the film-shaped one-way pouring nozzle 1 not subjected to expansion
plastic deformation by the heated packing material can effectively prevent the invasion
of ambient air into the interior of the package bag main body 2 associated with the
pouring of the packing material in the bag under a necessary and sufficient opening
of the pouring nozzle under a collapse deformation of the package bag main body 2.
Also, when the pouring is stopped based on the returning of the package bag to its
standing posture, the invasion of ambient air into the package bag main body can be
surely prevented by the self-seal non-return function based on the returning of the
pouring nozzle portion wetted with the packing material into the original form.
[0108] When each of the high melting sealant layer and low melting sealant layer in the
film-shaped one-way pouring nozzle is made from a low density polyethylene, or when
the high melting sealant layer is made from a middle density or high density polyethylene
and the low melting sealant layer is made from a low density polyethylene, a temporary
sealing having a sealing strength as is expected and a required fusion joining of
the film-shaped one-way pouring nozzle 1 can be realized simply and easily.
[0109] The heat-sealing strength of the temporarily sealed portion 12 is preferable to be
within a range of 0.3-3 (N/15 mm), particularly 0.7-1 (N/15 mm) in view that the accidental
opening of the temporarily sealed portion 12 is prevented and also the temporarily
sealed portion 12 is non-randomly opened without exerting on the other fusion-joined
portion.
[0110] When the heat-sealing strength is less than 0.3 (N/15 mm), there is fear of causing
the unintended opening of the temporarily sealed portion 12 in connection with the
volume and the like of the liquid packing material in the bag at a heating state,
while when it exceeds 3 (N/15 mm), there is a fear of accidentally exerting the load
required for the opening of the temporarily sealed portion 12 upon the other fusion-joined
portion and so on (breakage or opening).
[0111] The load for opening the temporarily sealed portion 12 is preferable to be 50-350
(N), particularly 80-300 (N), most preferably 100-200 (N), which does not cause the
breakage of other places including the sealed portion but also can not wrongly open
the portion in the transportation or operation.
[0112] When the opening load is less than 50 (N), it is feared that the temporarily sealed
portion 12 is opened at a lower stage side package bag when package bags each filled
with the packing material are piled one upon the other. While when it exceeds 350
(N), or when the heat-sealing strength is too high, there is a fear that the other
fusion-joined portion is affected by the load required for opening the temporarily
sealed portion 12.
[0113] According to the inventors' studies, for instance, when a base end portion of a film-shaped
one-way pouring nozzle 1 as shown in FIG. 1 is temporarily sealed by a low-temperature
temporary fusion to a side portion of an upper part of a soft package bag body 2 (NY
15 µm/PET 12 µm/LLDPE 40 µm), if a plastic film laminate structure of the film-shaped
one-way pouring nozzle 1 is straight-chain low density polyethylene layer (low melting
sealant layer)/biaxially oriented polyethylene terephthalate layer/straight-chain
low density polyethylene layer (high melting sealant layer), the heat-sealing strength
(N/15 mm) of the temporarily sealed portion when the plastic laminate film is heated
and pressurized by means of a heat sealer provided with a cylinder under a cylinder
pressure of 300 kPa for 3 seconds using the heat-sealing temperature as a parameter
is measured by a tensile testing machine (TENSILON RTG-1300) under conditions that
a tensile rate is 200 mm/min and a film width is 15 mm. The results are shown in Table
2.
[0114]
Table 2
Sealing |
106 |
108 |
110 |
112 |
114 |
116 |
temperature |
|
|
|
|
|
|
(°C) |
|
|
|
|
|
|
Average |
0.27 |
0.36 |
0.44 |
0.64 |
1.79 |
4.61 |
sealing |
|
|
|
|
|
|
strength |
|
|
|
|
|
|
(N/15 mm) |
|
|
|
|
|
|
* Measuring method: according to JIS E0236 (1996) |
[0115] Then, the invention proposes a liquid material-filled packaging structure constituted
by housing a non-self standing type liquid material-filled packaging body 8, which
is formed by filling a liquid or viscous packing material in the non-self standing
type flexible package bag provided with the film-shaped one-way pouring nozzle 1 protruding
from a side upper position of the package bag main body 2 made from a soft laminate
film through in-liquid seal-packing, in a self-standing type outer cylindrical package
bag 9, for example, a bag-shaped vessel such as standing pouch for assisting the self-standing
of the packaging body.
[0116] As the self-standing type outer packaging vessel 9 used for housing the aforementioned
non-self standing type liquid material-filled packaging body 8 according to the invention,
ones made from a laminate film at least having a cylindrical bag-shaped form in its
bottom portion as shown in Fig. 6 are preferably used, and more preferably a self-standable
vessel having a flat bottom portion at its lower end is used. As the outer packaging
vessel 9, vessel is preferably provided with an overhang small bag 9a protruded at
a position of an upper side portion corresponding to the film-shaped one-way pouring
nozzle 1 and having the same form as the film-shaped one-way pouring nozzle so as
to surround the nozzle. For example, the standing pouch is used.
[0117] Also, it is preferable that the outer packaging vessel 9 is heat-sealed at its top
portion together with a top portion of the liquid material-filled packaging body 8
to be housed as shown in Fig. 6, or can exchangeably house the liquid material-filled
packaging body by rendering the top portion into closable state with a chuck 17 or
the like as shown in Fig. 7.
[0118] In the invention a combination of the aforementioned non-self standing type flexible
package bag and standing pouch is preferable. A liquid material-filled packaging structure
20 is obtained by such a combination.
[0119] In the liquid material-filled packaging structure 20 according to the invention,
the self-standing type outer packaging vessel 9 is preferably used in the form of
standing pouch, for example, by using a laminate film comprising a uniaxialy or biaxially
oriented base film layer and a sealant layer in which the base film is a polyethylene
terephthalate film layer or a nylon resin film layer and the sealant layer is a polyethylene
layer or a polypropylene layer.
[0120] In the invention, however, at least a main body portion of the outer packaging vessel
9 may be another self-standing cylindrical plastic vessel in addition to the bag-shaped
standing pouch made from the soft film.
[0121] In the overhang small bag 9a located at an upper and side portion of the self-standing
type outer packaging vessel 9 and surrounding the nozzle 1 are disposed tear guide
perforations 15 made from opening means such as 1-notch, V-notch, U-notch, base notch,
diamond cut or the like at a position corresponding to the tear-opening portion of
the film-shaped one-way pouring nozzle to form a cut-removing portion 19 for exposing
the film-shaped pouring nozzle 1 as shown in Figs. 6 and 7. The cut-removing portion
19 is cut off for opening, whereby the non-self standing type flexible package bag
housed in its interior or the protruding portion of the film-shaped one-way pouring
nozzle 1 protruded from the liquid material-filled packaging body 8 can be exposed,
and further the pouring nozzle 1 is opened to provide in use.
[0122] In the invention, the liquid material-filled packaging body 8 is housed in the standing
pouch 9 and, if necessary, the horizontal seal portion 8a of its upper end part is
fused to an upper side portion 9b of the standing pouch 9 partially (spot) or over
full width through heat sealing as shown in Fig. 6, whereby the packaging body is
housed at a suspension state. In this case, the liquid material-filled packaging body
8 filled with the liquid material can be kept in the standing pouch 9 at a firmly
fixed state but also the smooth pouring of the liquid packing material is promoted.
[0123] In the liquid material-filled packaging structure 20 of Fig. 6, the liquid material-filled
packaging body 8 can be protected sufficiently from various shocks during the handling
or transportation, while the position shifting of the liquid material-filled packaging
body 8 is not caused and the occurrence of pinhole and the like or the deformation,
breakage and further miss-opening of the film-shaped one-way pouring nozzle 1 can
be prevented.
[0124] After the liquid material-filled packaging body 8 is housed in the standing pouch
9, it is preferable to fix or attach one or more places of the vicinity of the film-shaped
one-way pouring nozzle 1, the vicinity of the bottom portion or upper portion of the
packaging body 8 or the upper portion of the package bag main body 2 and further the
bottom portion thereof to the standing pouch 9, which is effective for smoothly pouring
the liquid packing material until the end.
INDUSTRIAL APPLICABILITY
[0125] The technique of the invention is applicable to not only the package bag provided
with the film-shaped one-way pouring nozzle but also usual liquid material-filled
packaging bodies, especially a packaging structure formed by housing a refill soft
package bag integrally united with a usual liquid pouring port in a package bag main
body.
1. A flexible package bag provided with a nozzle of a non-return function comprising
a package bag main body formed by seal-joining front-side and rear-side flexible laminate
films, and a film-shaped one-way pouring nozzle protruded from a side portion of the
package bag body and formed by closing a pair of overlapping plastic films to each
other in the presence of a liquid packing material, characterized in that at least an upper part of a non-sealed portion of at least one of the front-side
and rear-side laminate films in the package bag main body or a part thereof in the
vicinity of a side edge of the film-shaped one-way pouring nozzle is constructed with
a laminate film having irregular inner surfaces.
2. A flexible package bag provided with a nozzle of a non-return function according to
claim 1, wherein the irregular inner surface formed in the laminate film is formed
in a partial or full pattern by subjecting to embossing, blasting, knurling, wrinkling,
or vertical-horizontal striping in the form of plane, island or stripe.
3. A flexible package bag provided with a nozzle of a non-return function according to
claim 1 or 2, wherein the film-shaped one-way pouring nozzle is formed by fusing two
overlapping soft plastic films to each other at a peripheral edge portion other than
a portion corresponding to a base end portion of the nozzle so as to constitute a
central portion thereof as a pouring path and integrally uniting with the package
bag main body, and generates a non-return function blocking penetration of ambient
air by a closing action between mutual inner faces of the plastic films based on a
fact that when the package bag main body is tilted to pour a liquid packing material
therefrom, the pouring path is rendered into a wet state due to the passing of the
liquid packing material to attach the liquid packing material to the inner face of
the pouring path.
4. A flexible package bag provided with a nozzle of a non-return function according to
any one of claims 1 to 3, wherein the film-shaped one-way pouring nozzle has an irregular
inner surface in at least one of the front-side and rear-side overlapping plastic
films at a side of a base end portion of the nozzle other than a predetermined tearing
position of the nozzle and a vicinity thereof.
5. A flexible package bag provided with a nozzle of a non-return function according to
any one of claims 1 to 4, wherein at the base end portion of the film-shaped one-way
pouring nozzle are temporarily fused opposite sealant layers of the overlapping plastic
films at a lower temperature to temporarily seal the inner face of the pouring path.
6. A flexible package bag provided with a nozzle of a non-return function according to
any one of claims 1 to 5, wherein the package bag main body has a gas reserving space
at a position of an upper and side sealing portion thereof higher than an upper edge
of the film-shaped one-way pouring nozzle.
7. A liquid material-filled packaging structure comprising a non-self supporting type
liquid material-filled packaging body formed by deaeration-packing a liquid or viscous
packing material into a non-self supporting type flexible package bag comprised of
a package bag main body formed by seal-joining front-side and rear-side flexible laminate
films and a film-shaped one-way pouring nozzle protruded from a side portion of the
package bag main body and formed by closing a pair of overlapping plastic films to
each other in the presence of a liquid packing material, wherein at least an upper
part of a non-sealed portion of at least one of the front-side and rear-side laminate
films in the package bag main body or a part thereof in the vicinity of a side edge
of the film-shaped one-way pouring nozzle is constructed with a laminate film having
irregular inner surfaces, and a self-supporting type outer cylindrical packaging vessel
for housing the non-self supporting type liquid material-filled packaging body which
is provided at its one-side portion with tear-guide perforations for nozzle drawing
for exposably housing the film-shaped one-way pouring nozzle and exposing a tip portion
of the nozzle to protrude an openable overhang small bag and dispose a self-supportable
bottom plate.
8. A liquid material-filled packaging structure provided with a nozzle of a non-return
function according to claim 7, wherein the irregular inner surface formed in the laminate
film is formed in a partial or full pattern by subjecting to embossing, blasting,
knurling, wrinkling, or vertical-horizontal striping in the form of plane, island
or stripe.
9. A liquid material-filled packaging structure provided with a nozzle of a non-return
function according to claim 7 or 8, wherein the film-shaped one-way pouring nozzle
is formed by fusing two overlapping plastic films to each other at a peripheral edge
portion other than a portion corresponding to a base end portion of the nozzle so
as to constitute a central portion thereof as a pouring path and integrally uniting
with the package bag main body, and generates a non-return function blocking penetration
of ambient air by a closing action between mutual inner faces of the plastic films
based on a fact that when the package bag main body is tilted to pour a liquid packing
material therefrom, the pouring path is rendered into a wet state due to the passing
of the liquid packing material to attach the liquid packing material to the inner
face of the pouring path.
10. A liquid material-filled packaging structure provided with a nozzle of a non-return
function according to any one of claims 7 to 9, wherein the film-shaped one-way pouring
nozzle has an irregular inner surface in at least one of the front-side and rear-side
overlapping plastic films at a side of a base end portion of the nozzle other than
a predetermined tearing position of the nozzle and a vicinity thereof.
11. A liquid material-filled packaging structure provided with a nozzle of a non-return
function according to any one of claims 7 to 10, wherein at the base end portion of
the film-shaped one-way pouring nozzle are temporarily fused opposite sealant layers
of the overlapping plastic films at a lower temperature to temporarily seal the inner
face of the pouring path.
12. A liquid material-filled packaging structure provided with a nozzle of a non-return
function according to any one of claims 7 to 11, wherein the package bag main body
has a gas reserving space at a position of an upper and side sealing portion thereof
higher than an upper edge of the film-shaped one-way pouring nozzle.
13. A liquid material-filled packaging structure according to any one of claims 7 to 12,
wherein the non-self supporting liquid-filled packaging body is housed and kept in
the self-supporting type outer package bag at a suspended state by fusing a horizontal
seal portion at an upper end part of the packaging body to an upper end portion of
the outer package bag.
14. A liquid material-filled packaging structure according to any one of claims 7 to 12,
wherein the self-supporting outer cylindrical packaging vessel has a flat bottom portion
at its lower end portion and is a flexible package bag made from an openable soft
laminate film for exchanging the non-self supporting type liquid material-filled packaging
body.