JPH1191800A - Easy openable pouch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pouch having a gusset in which unsealing and a taking out of content can be easily carried out irrespective of presence or non-presence of a matched adhering while unsealing is not inhibited by the content and damage is not given to the content even if the content has substantially same size as an inner size of the bag and further even if the content is a thick solid material. SOLUTION: An easy openable pouch is comprised of a gusset 1 and an end edge seal section 2. A valley folding section 12 becoming at least an unsealing start portion of the gusset 1 is provided with a weakening part 13 and a pouch wall peeling-off planned part 14. The end edge seal 2 is an easily peelabe seal. It can be opened by peeling off the end edge seal 2 from the gusset.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easy-open pouch, and more particularly, to a method of peeling an edge seal portion from a valley folded portion of a gusset in a pouch having a gusset and an edge seal portion. The present invention relates to an easy-opening pouch that can be opened by using a pouch.

[0002]

2. Description of the Related Art Pillow packaging pouches having a seal at both ends and gussets at both sides, or further provided with a gasket are widely used as packages for easily packing solid foods or parts. As shown in FIG. 1 (prior art), such pillow-packing pouches have both side edge gussets 1 a and 1 b around a pouch container wall 4 and both end edge seal portions 2.
a, 2b, and if desired, attached to the center of the vessel wall
A type in which notches 5 are provided in both end seal portions 2a and 2b is widely used.

[0003] Gusseted pillow-packed pouches, gusseted square bottom pouches and the like with gussets are suitable for filling thick bulky contents: in general, the width of the pouch after packing is wider than the width of the contents. By inserting gussets, the width of the pouch can be made the same as the width of the contents: there is an advantage that the bottom can be folded into a square-bottom shape so that it can be self-supporting.

[0004] Japanese Utility Model Publication No. 6-47883 discloses that
As shown in (a) and (b) of FIG. 3 (prior art), in a packaging bag laminate film formed by laminating a plurality of plastic films, a plastic film located on one side of the plastic laminate film is formed. At the position corresponding to the bent portion 6 located at the edge of the packaging bag to be provided, a narrow opening rough surface 7 extending in a meandering manner in the direction of the folding line is provided, and the opening rough surface 7 is formed on a plastic film. A plastic laminating film for a packaging bag, which is formed from a wound part to be damaged and a plastic material filling the wound part, is described.

[0005] Japanese Patent Application Laid-Open No. 9-86547 describes a packaging pouch of the type that can be opened from the jointed palm.
More specifically, in a pillow packaging pouch having a jointed palm and both end seals, a weakened portion provided along the base of the jointed palm and an end seal at the intersection of the jointed palm and the end seal. A peelable seal portion provided on at least a part of at least one of the edge seal portions from the edge seal portion on the palm jointed root, a grip portion composed of the joint palm, and a pouch device wall torn along the joint palm joint; And an easy-opening pouch that can be opened along the jointed palm. As shown in FIG. 4 (prior art), this pouch is provided with a rough surface for opening at the base 7 of the palm joint 1 and an easily peelable sealing material 8 at the edge seal portion 2.
The pillow packaging pouch is used to hold the end portion of the palm joint 1 and the edge seal portion 2, and is opened by tearing and peeling in the pouch surface attached with the palm joint.

[0006]

The gusseted pouch is
Although having the above-mentioned characteristics, the known pouch with gusset has a problem that the opening operation is not necessarily progressed smoothly because the opening operation is hindered by the hard contents, or it is not always easy to take out the contents. I have.

In the case of the pouch shown in FIG. 1 (prior art),
As shown in FIG. 2, when the content 9 is a solid having substantially the same size as the inner size of the bag, there is a problem that the tearing direction shifts because the content hinders tearing, and it is difficult to open the bag straight. .

In the case of the pouch shown in FIG. 3 (prior art),
When the contents are solids having a size substantially the same as the inner size of the bag, in addition to having the same problems as the pouch in FIG. Since the contents are sometimes picked together, there is a problem that the contents are broken (for example, a biscuit or a wafer) or deformed (for example, a yokan). In particular, when the contents are thick (for example, a film with a lens or soap), not only the above-described problem becomes remarkable, but also it is difficult to start the opening itself. Becomes difficult. In addition, there is a problem that the number of locations that need to be processed increases and the processing becomes complicated.

As a simplest method for solving the problems of the pouch, it is conceivable to make the pouch large enough for the contents, but in this case, the pouch base material is often increased. This creates an economic problem of having to use it.

In the pouch shown in FIG. 4, the pouch shown in FIGS. 1 and 3 solves the problem of the pouch shown in FIGS. However, since the Gassho paste is located in the center of the pouch, the opening is only opened to half the width of the pouch. In addition, since the gasket is gripped and opened, there is a problem that the method cannot be applied to a pouch having no gasket such as an envelope-attached pillow packaging pouch. Furthermore, in the case of a product such as a biscuit or a freeze-dried product that is contained in an inner case, if the back is placed on the bottom side of the case, it is inconvenient to take out the contents, so that there is a restriction on how to put the inner case.

The above-mentioned pillow packaging pouch has the advantage that the filling of the contents and the bag making can be performed simultaneously by one apparatus, and the bag can be made according to the size of the contents.
There is an advantage that a small amount of base material is used. However, known pillow packaging pouches are not yet sufficiently satisfactory in opening property and stability of opening property.

[0012] Accordingly, an object of the present invention is to provide a method for opening a package, even if the contents are substantially the same size as the inner size of the bag, and even if the contents are thick solids, An object of the present invention is to provide a gusseted pouch that can be easily opened and its contents taken out without damaging the contents, regardless of the presence or absence of a gasket. Another object of the present invention is to provide a pouch exhibiting stable performance by minimizing the processing for opening.

[0013]

According to the present invention, in a pouch having a gusset and an edge seal portion, a weakened portion and a to-be-teared portion of a pouch device wall are formed at least in a valley-folded portion serving as a start portion of opening of the gusset portion. Wherein the edge seal portion is an easily peelable seal and can be opened by peeling off the edge seal portion from the gusset portion. According to the present invention, also, in a pouch having a gusset, a palm joint, and an edge seal portion, the gusset portion has a weakened portion and a torn portion of the pouch container wall at a valley fold portion that is at least an opening start portion, An easy-opening pouch is provided, wherein the edge seal portion and the gasket paste are easily peelable seal portions, and the seal can be opened by peeling the edge seal portion and the gasket paste from the gusset portion. According to the present invention, further, in a pouch having a gusset and an edge seal portion, the gusset portion has at least a valley fold portion serving as an opening start portion and a weakened portion and a scheduled tearing portion of the pouch container wall, and the edge seal is provided. The portion is an easily peelable seal, has an opening notch or a weakened portion at a position separated from the valley folded portion of the edge seal portion, peels the edge seal portion from the gusset portion and triggers the opening notch or the weakened portion. The present invention provides an easily-openable pouch, which can be opened by tearing a pouch material. In the present invention, the to-be-teared portion may be formed of a weakened line provided on at least one layer of the pouch wall constituting material, or may be formed of an easily tearable resin layer provided on at least one layer of the pouch wall constituting material. Preferably, the easily tearable resin layer is a resin film layer that is preferentially stretched in the tear direction, or a plurality of pieces that form a sea-island structure in a cross section perpendicular to the tear direction and have a dispersed phase extending in the tear direction. It is preferably formed from a resin blend.

[0014]

DETAILED DESCRIPTION OF THE INVENTION

[Operation] The easy-open pouch of the present invention has gussets 1 arranged at right angles to each other, as shown in (a) (perspective view) and (b) (enlarged cross-sectional view of the edge seal portion) of FIG. The gusset 1 has a mountain fold 11 and a valley fold 12. The gusset 1 has a weakened portion 13 and a pouch at least in the valley fold 12 serving as an opening start portion. It is characterized in that a tearable portion 14 of the container wall is provided, and the edge seal portion 2 is an easily peelable seal.
The gusset can be opened by peeling the edge sealing portion 2 from the valley folded portion 12.

In FIG. 5 (b), the pouch walls 4, 4 are heat-sealed to each other, but the two folded portions 15a, 15b of the gusset 1 each comprise an outer piece 41 and an inner piece 42. ing. The outer piece 41 is connected to the inner piece 42 at the mountain fold 11, and the two inner pieces 4
Numerals 2 are connected to each other at a valley fold 12. Heat sealing is performed between the opposing pouch walls 4, 4 and the opposing outer piece 41, inner piece 42, and the heat sealing of the opposing pouch walls 4, 4 is an easily peelable seal. .

FIG. 12 is a cross-sectional view of a heat seal edge (including a gusset) outside the edge seal portion 2, and is an explanatory view illustrating stepwise how the pouch member is broken by opening. FIG. 12A showing the state after the edge sealing is performed is the same as FIG. 5A, and in the valley folded portion 12 of the gusset, the weakened portion 1 is attached to the inner piece 42.
3 are formed.

In FIG. 12B, the gusset 1 has a folded portion 15a,
By pulling 15b in opposite directions, that is, in the direction of the arrow in the figure, stress concentration occurs in the weakened portion 13 of the valley fold portion 12, and the inner piece 42 is broken first.

In FIG. 12C, by continuing the tension, the stress concentration shifts to the easily peelable heat seal portion (interface) 21 of the pouch walls 4, 4, and the peeling at the interface 21 proceeds. .

At the same time as the peeling at the easily peelable seal portion 21, the tearing of the container wall material 4 proceeds at the tearing scheduled portion 14 (see FIG. 5A) provided in the valley folded portion 12 of the pouch container wall material. Then, the opening progresses.

In the present invention, it is important to provide a weakened portion 13 and a torn portion 14 of the pouch wall in the valley folded portion 12 and to make the edge seal portion 2 an easily peelable seal 21. As already described, in the present invention, the opening of the valley fold 12 is started from the weakened portion 13,
This opening force acts on the easily peelable edge seal portion 2,
The peeling at the edge seal portion 2 proceeds, and at the same time, the opening force is applied to the tearing scheduled portion 14 of the valley fold portion 12,
Tearing of the pouch wall will proceed. On this occasion,
The edge seal portion 2 includes a valley fold portion 12 that has started torn.
A force in the direction away from the valley fold 12 naturally acts on the valley fold 12, and as a result, the tearing force is reduced by the to-be-teared portion 14 of the valley fold 12.
The tearing of the pouch wall 4 can be performed smoothly and reliably along the scheduled tearing portion 14 of the valley fold 12.

The opening with the easy-opening pouch of the present invention can be performed in any order as long as the above-described order is taken.
For example, the opening operation may be performed by a tearing operation at one place and an edge seal peeling operation at one to three places.
A tearing operation at a location and an edge seal peeling operation at one or two locations may be performed.

In the example of FIG. 6, the weakened portion 13 of the valley folded portion 12 is formed.
After the start of opening, the peeling at one edge seal portion 2a and the tearing at the valley fold portion 12 progress, and then the peeling of the other edge seal portion 2b is performed, so that the content 9 can be smoothly taken out. It becomes possible.

In the example shown in FIG. 7, the gasket paste 3 is also an easily peelable seal, and after the opening of the weakened portion 13 of the valley folded portion 12 is started, the peeling at one edge seal portion 2a and the valley folded portion are performed. 12
Tearing and peeling of the easily peelable palm joint 3 progresses,
The contents 9 can be smoothly taken out.

In the example shown in FIG. 8, the opening notch or the weakened portion 5 is located at a position of the edge seal portion 2a separated from the valley folded portion 12.
After the opening of the weakened portion 13 of the valley folded portion 12 is started, the pouch material is triggered by peeling at the one edge seal portion 2a, tearing at the valley folded portion 12, and opening notch or weakened portion 5. 4 progresses, and the contents 9 can be taken out smoothly.

Gussets 1 are provided at both ends of the edge seal portion 2.
a, 1b, and the weakened portion 1
In the case of an easy-open pouch (see FIG. 9) provided with an opening 3 and provided with an opening start portion, the pouch can be opened in a form as shown in FIG.

In order to achieve the object of the present invention of facilitating the start of opening, at least the valley folded portion 12 of the gusset to be the opening start portion is provided with a weakened portion by a scar, a score or a notch. When the gusset has a plurality of valley-folded portions 12 serving as opening start portions, the weakened portions 13 may be provided at all locations, or may be provided only at specific locations. When the weakened portion 13 is provided only at a specific location, it is preferable to display an opening start position.

[Pouch Wall] In the present invention, as the flexible material constituting the pouch wall, an olefin resin for imparting heat sealing properties, a stretched plastic film for imparting mechanical strength, heat resistance and the like are used. , A metal foil for imparting gas barrier properties to oxygen and the like, a gas barrier resin, and the like are used in a laminate form in a plurality of combinations.

As the heat-sealable resin film, generally, low-, medium-, high-density polyethylene, linear low-density polyethylene, isotactic polypropylene, propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, Modified olefin resins such as ethylene-acrylic acid copolymer, ethylene-methyl methacrylate copolymer, ion-crosslinked olefin copolymer (ionomer), olefin resin graft-modified with ethylenically unsaturated carboxylic acid or anhydride thereof A polyamide or copolyamide resin having a relatively low melting point or low softening point; or a polyester or copolyester resin having a relatively low melting point or low softening point;
These films preferably have a thickness of 15 to 100 μm.

As the film other than the heat-sealing resin, polyester films such as polyethylene terephthalate, polybutylene terephthalate, and ethylene terephthalate / isophthalate copolymer: nylon 6,
Polyamide films such as nylon 6, 6, nylon 11, nylon 12, etc .: propylene-based polymer films: polyvinyl chloride films: polyvinylidene chloride films: ethylene vinyl alcohol copolymer films, and the like. These films may be unstretched, uniaxially stretched or biaxially stretched. It is desirable that the thickness is generally in the range of 3 to 50 μm, particularly 5 to 40 μm. The use of a uniaxially stretched film is preferable because tearing properties can be obtained in the molecular orientation direction.

As the metal foil used to impart gas barrier properties, various surface-treated steel foils and light metal foils such as aluminum are used. As the surface-treated steel foil, one or two or more kinds of surface treatment such as zinc plating, tin plating, nickel plating, electrolytic chromic acid treatment, chromic acid treatment, etc. are performed on cold-rolled steel foil, or prior to final rolling. The surface-treated steel foil obtained by performing the plating treatment and then performing the cold rolling treatment can be used. As light metal foil,
An aluminum alloy foil is used in addition to a so-called pure aluminum foil. These metal foils have a thickness of 150 μm or less, particularly 5 to 120 μm.

One surface of the metal foil may be provided with a protective coating by a method other than lamination. The formation of the protective coating is performed by providing a protective coating. As the protective coating, any protective coating composed of a thermosetting or thermoplastic resin: for example, a modified epoxy coating such as a phenol-epoxy coating or an amino-epoxy coating: for example, a vinyl chloride-vinyl acetate copolymer, a vinyl chloride-vinyl acetate Partially saponified copolymer, vinyl chloride-vinyl acetate-maleic anhydride copolymer, epoxy-modified, epoxyamino-modified or epoxyphenol-modified vinyl or modified vinyl paint such as vinyl paint: acrylic resin paint: styrene -One or a combination of two or more of synthetic rubber-based paints such as butadiene-based copolymers is used. These paints are used in the form of an organic solvent solution such as enamel or lacquer, or in the form of an aqueous dispersion or aqueous solution, such as roller coating, spray coating, dip coating, electrostatic coating, electrophoretic coating, etc. Apply to the material. Of course, if the resin coating is thermosetting, the coating is baked if necessary. The protective coating is generally 2 to 30 μm, particularly 3 μm, from the viewpoint of corrosion resistance and workability.
It is desirable to have a thickness (in a dry state) of from 20 to 20 μm.

As the gas barrier resin, a thermoplastic resin having a low oxygen permeability coefficient and being thermoformable is used. As the most suitable example of the gas barrier resin, an ethylene-vinyl alcohol copolymer can be mentioned,
For example, if the ethylene content is 20 to 60 mol%, especially 2
A saponified copolymer obtained by saponifying an ethylene-vinyl acetate copolymer of 5 to 50 mol% to have a saponification degree of 96 mol% or more, particularly 99 mol% or more is used. The saponified ethylene-vinyl alcohol copolymer should have a molecular weight sufficient to form a film, and is generally 85: 1 by weight phenol: water.
It is desirable that it has a viscosity of at least 0.01 dL / g, particularly at least 0.05 dL / g, measured in a mixed solvent of No. 5 at 30 ° C.

Other examples of the gas barrier resin having the above-mentioned properties include polyamides having an amide group number of 5 to 50, especially 6 to 20 per 100 carbon atoms; for example, nylon. 6, nylon 6,6, nylon 6 / 6,6 copolymer, metaxylylene adipamide, nylon 6,10, nylon 11, nylon 12, nylon 13, hexamethylene terephthalamide / isophthalamide copolymer, or These blends are used. These polyamides should also have a molecular weight sufficient to form a film, and have a relative viscosity (ηrel) measured at a concentration of 1.0 g / dl in concentrated sulfuric acid at a temperature of 30 ° C. of 1.1 or more, especially 1.5 or more. Is desirable.

These gas barrier resins are 3 to 1
It is used in a thickness of 50 μm, especially 5-100 μm.

Suitable examples of the laminate include olefin resin heat seal layer / uniaxially oriented polypropylene film, olefin resin heat seal layer / biaxially oriented nylon film, olefin resin heat seal layer / biaxially oriented polyethylene terephthalate film, Olefin resin heat seal layer / aluminum foil / biaxially oriented polypropylene film, olefin resin heat seal layer / aluminum foil / biaxially oriented nylon film, olefin resin heat seal layer / aluminum foil / biaxially oriented polyethylene terephthalate film, olefin Resin heat seal layer / ethylene vinyl alcohol copolymer / biaxially oriented polyester film, olefin resin heat seal layer / amorphous aromatic polyamide / biaxially oriented polyethylene terephthalate film Beam, an olefin resin heat seal layer / metallized biaxially oriented polyethylene terephthalate film or the like, but is not limited to this example. The overall thickness of the laminate is between 10 and 200 μm, in particular between 30 and 15
It is preferably in the range of 0 μm.

The production of the laminate is performed by dry lamination,
It can be carried out by any means known per se, such as sandwich lamination, extrusion coating, coextrusion and the like. When sufficient adhesiveness cannot be obtained between the layers, an adhesive resin such as a urethane-based adhesive, an epoxy-based adhesive, and an acid-modified olefin-based resin adhesive can be used.

In sandwich lamination, an arbitrary resin is extruded between films or between a film and a metal foil. In extrusion coating, an arbitrary resin is extruded on a film or a metal foil. It is performed by Extruded resins are generally low-, medium-, high-density polyethylene, linear low-density polyethylene, isotactic polypropylene, propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer. Modified olefin resins such as coalesced copolymers, ethylene-methyl methacrylate copolymers, ion-crosslinked olefin copolymers (ionomers), olefin resins graft-modified with ethylenically unsaturated carboxylic acids or anhydrides; A polyamide or copolyamide resin having a softening point; a polyester or copolyester resin having a relatively low melting point or a low softening point; a blend resin comprising one or more of the above resins and / or a known filler; Layer extrusion or coextrusion is used. On the surface where the extruded resin layer is applied, urethane-based,
An anchoring agent such as titanate can be applied.

[Form of Pouch] As long as the easy-open pouch of the present invention includes the gusset 1 and the edge sealing portion 2,
It can take any pouch structure, for example, a gusseted pillow packaging pouch (FIG. 14) or a gusseted square bottom pouch (FIG. 9). In the former case, the edge seal is formed on both sides of the pouch, while in the latter case it is formed on only one side. In these pouches,
The palm joint 3 may be formed (FIG. 14) or may not be provided (FIGS. 9 and 15). The gusset 1 may be provided on both sides of the easy-open pouch (FIG. 14) or may be provided on only one side (FIG. 1).
5).

Furthermore, at least one of the edge seal portions 2 is an easily peelable edge seal portion, and the weakened portion 1 is
Although it is an essential condition that the tearable portion 14 is formed on the extension line 3 and its extension, even if the other of the two tearable portions is provided at an arbitrary position (FIGS. 7 and 8),
It may not be provided (FIG. 6).

Further, the other of the two to-be-teared portions may be the to-be-teared portion 14 provided on the valley folded portion 12 of the other gusset 1b (FIGS. 9 and 10), or the easily peelable palm joint 3 may be used. (FIG. 7) Alternatively, a tearing portion may be connected to the weakened portion (notch) 5 provided at the other portion of the edge seal portion 2 and provided with a trigger for tearing (FIGS. 8 and 11). And FIG. 14).

In the simplest configuration, according to the present invention, the gusset can be easily opened. Therefore, by providing a gusset on a pouch that usually does not have a gusset, a pouch that can be easily opened can be formed. For example, by providing the gusset 1 on one side of the three-side seal pouch as shown in FIG. 15, the pouch can be easily opened. On the opposite side of the gusset 1, a side seal 2c is formed as a matter of course.

In FIG. 9, which shows an example of a square-bottomed pouch with gussets, this pouch has a lateral sealing portion 44 formed by a vessel wall material 4 having a large area and a separate vessel wall material 43 having a small area for forming a gusset. The gussets 1a and 1b are bonded together to form gussets 1a and 1b. In this pouch, an opening edge seal portion 2 is provided only on one side, and the tearing of the wall material is performed along the scheduled tearing portions 14 provided on the valley folded portions 12 of the gussets 1 on both sides. Done. The structure of the edge seal 2 is the same as that shown in FIG.
The state of tearing and opening is shown in FIG.

FIG. 11 shows a case in which, of the two torn portions, the other torn portion is provided other than the valley-folding portion 12 of the other gusset or the jointed palm 3.
In the valley folded portion 12 of one gusset 1a, a weakened portion 13 serving as an opening start portion and a tearing scheduled portion 14 are formed. In the embodiment shown in FIG.
A notch 52 that triggers a tear in the other to-be-teared portion is provided in the edge seal portion at a distance x from the edge seal portion.
The notch 5 is provided. In this easy-open pouch, an opening operation is performed in a form shown in FIG.

In the embodiment shown in FIG. 11B, a band-shaped scar group 55 is formed in the mountain-folded portion 11 of the gusset 1b instead of the notch 51 in FIG. 11A. Along 55, initiation and progression of the tearing of the other side of the wall material takes place.

As shown in FIG. 14, an easy-open pouch used for filling a hard rectangular parallelepiped such as a film with a lens has a palm joint 3 in the central longitudinal direction and gussets 1a on both sides in parallel with the joint palm 3. , 1b are formed, and edge seal portions 2a, 2b are formed at both ends of the pillow. One edge seal 2a extends parallel to the front of the large area of the pouch, and the other edge seal 2b is bent so as to overlap the bottom surface. At the substantially center of the one edge seal 1a, a horizontally protruding opening 23 for inserting a hook for display is formed. A second weakened portion (notch) 53 is formed at the edge of the edge seal portion 1a and extends toward a portion close to the weakened portion 13 which becomes the opening start portion in the opening 23.
A third and third weakened portion 54 is formed at a position apart from the second weakened portion (notch) 53 at the inner edge of the opening 23. In this type of easy-opening pouch, opening of the gusset 1a is started from an opening start portion 13 provided in the valley-folding portion 12, and tearing of the container wall at the valley-folding portion 12 and easy-peeling edge. The peeling of the seal portion 2a and the tearing of the vessel wall triggered by the second weakening portion 53 proceed to the opening 23, and further the peeling from the inner edge of the opening 23 to the third weakening portion 54 and the same. The opening operation is performed as the triggering of the tearing of the vessel wall proceeds.

[Weakened portion] In the present invention, the weakened portion refers to a portion giving a trigger for tearing that is more easily broken by tearing than other vessel wall portions. The edge seal portion starts peeling triggered by the tear.

In the present invention, the weakened portion is formed at the valley fold 12 of the gusset 1. The valley fold 12 at which the opening is started is provided with a plurality of scars or one or more scores, or the opening is started. Notches are cut in the valley folds 12.

The scar provided on the valley fold 12 may be any known scar itself. For example, the scar may be in the form of a dot, a dotted line, a line (short line, long line), It may have a pattern such as a river shape, a C shape, or a cross shape, or a mixture of these.

The depth of the scar may or may not penetrate the vessel wall.
The average distance between adjacent scars is preferably within 3 mm, more preferably within 2 mm. Further, the area where the scar is provided is provided at least at the edge of the pouch and / or the edge seal of the valley folded portion of the gusset. When the group of scars is strip-shaped, it is preferable to provide the group of scars in parallel with the gusset. Of the pouch container wall material, the layer on which a scar is formed is not particularly limited, and there is no distinction between an outer layer, an intermediate layer, and an inner layer.

Examples of the method of cutting a scar on a substrate include processing with a disk-shaped or roll-shaped grindstone, processing with a disk-shaped or roll-shaped tool having a plurality of projections or cutting edges formed on the surface, and a tool and a base. An abrasion-like processing performed by giving a speed difference to the material, a dot-like or linear laser processing using a kaleidoscope or the like is appropriately adopted.

When a score is provided as a weakened portion, the score is preferably provided in parallel with the edge seal in the vertical direction. It is preferable that at least one score is provided around the valley fold of the gusset. The depth of the score may be one that does not penetrate the base material or one that does.

The position of the score is such that the distance between the gusset valley fold and the score closest to the gusset valley is within 3 mm, preferably within 2 mm. Further, the range in which the score is provided is preferably provided at least at the edge of the pouch and / or at the edge sealing portion of the valley folded portion of the gusset in parallel with the gusset. Further, the layer on which the score is provided may be arbitrary, and there is no distinction between the outer layer, the intermediate layer, and the inner layer of the vessel wall.

When a notch is used as the weakened portion, it is preferable that at least one notch is provided only in the base material of the valley fold portion of the gusset in proximity to the valley fold line. At this time, the distance from the valley fold line to the notch tip is the closest to 2
mm, preferably within 1 mm.

The type of the notch is not particularly limited, and for example, an I notch, a U notch, a V notch, and other notches can be adopted. The length of the notch may be only the unsealed portion at the edge of the pouch, but is desirably extended to the heat-sealed portion.

The formation of the notch is not particularly limited, but in order to provide the notch only on the base material of the valley fold portion of the gusset,
Before heat sealing the edge, it is preferable to provide the edge in the portion where the notch is to be formed.

[Second Weakening Section] A second weakening section can be provided in the edge seal portion of the pouch. The cut position is preferably at least one or more from the root of the jointed palm to the bent portion on the pouch side end at least at the end of the pouch along the edge seal portion to be peeled off. FIGS. 11A and 14 show examples of how to provide the second weakened portion. In FIG. 11A, the notch 5 and the notch are formed in the portion of the pouch to be peeled (region X). 52 are both provided.

[Tearable portion] Various means can be used to impart tearability to the tearable portion of the pouch container wall. As described above, by imparting a high degree of uniaxial orientation to the resin film, it is possible to impart tearability in the orientation direction. The degree of orientation is 0.00
Any material that gives a birefringence (Δn) of 1 or more, particularly 0.005 or more, may be used. Although the resin film may be biaxially oriented, it should be understood that in this case, the uniaxial orientation should be significant.

As a method for imparting tearability to the pouch wall, a plurality of thermoplastic resins incompatible with each other are formed, and these resins form a sea-island dispersed structure in a cross section perpendicular to the tearing direction. In addition, a blend layer in which the dispersed phase extends in the tearing direction can be used.

The resin forming the continuous phase in the blend may be an olefin resin, while the resin forming the dispersed phase may be a styrene polymer, a polyester polymer or a polycarbonate polymer. Coalescence, polyamide-based polymer, and the like. Of course, the latter resin may be used as a continuous phase, and the former resin may be used as a dispersed phase. It is preferable to use the resin constituting the continuous phase in an amount of 50% by weight or more, particularly 55 to 90% by weight, and the resin constituting the dispersed phase in an amount of less than 50% by weight, particularly 10 to 45% by weight.

The size of the dispersed phase is not particularly limited, but in a cross section perpendicular to the tearing direction, the diameter (Dn) in the thickness direction of the film is generally 0.05 to 20 μm, particularly 0.1 to 10 μm. The ratio (Dn / Dt) of the ratio of the diameter (Dt) in the width direction to the diameter in the thickness direction (Dn / Dt) is preferably 10 or less, particularly 6 or less. In particular, the number may be 50 or more.

The tearable resin layer can be provided as an outer layer and / or an intermediate layer of the laminate sheet.

The easy tearability of the pouch wall can also be imparted by forming at least one layer of the laminate with a mechanically weakened portion, such as the aforementioned scars or scores. In the example shown in FIG. 11B, the band-shaped scar group 53 is provided linearly with a constant width along the mountain-folded portion of the gusset.

Further, a peelable seal extending in a direction perpendicular to the edge seal, for example, an easily peelable palm joint, may be used as the to-be-teared portion. In this case, it is the peeling of the seal, which is strictly different from the tearing of the vessel wall, but is based on the fact that the vessel wall is divided in a direction perpendicular to the edge seal.

[Releasable Seal] In the present invention, at least one of the edge sealing portions or the joints on the palms is used as a releasable seal.

The appropriate heat seal strength of the peelable seal portion varies depending on the structure and use of the pouch substrate, but is generally 0.1 k / 15 mm width from the viewpoint of bag breaking strength and openability.
g to 3 kg, more preferably 0.2 kg to 2 k
g or less is desirable. Further, the width of the heat seal is preferably 2 mm or more and 80 mm or less, more preferably 3 mm or more and 50 mm or less. Since the opening property after the start of opening depends on the strength when the edge seal portion is peeled off in the longitudinal direction, this value is set to 0.05 kg or more and 2 kg or less, more preferably 0.1 kg or less.
It is desirable to adjust to not less than 1.5 kg.

As described above, when the weakened portion is formed in the valley folded portion 12 and the edge seal 2 of the container walls 4, 4 is an easily peelable seal, as shown in FIG. The opening progresses smoothly, but if the edge seals 2 of the container walls 4 and 4 have normal strong sealing strength, a trouble as shown in FIG. 13 occurs at the time of opening. As shown in FIGS. 13A and 13B, the folded portion 15a or 15b of the gusset 1 is broken and cannot be opened, or as shown in FIG. Peeling occurs between the layers. When the peel strength is low, there is no problem in the opening property. However, when the internal pressure of the pouch becomes high (for example, during air transportation), the bag may be broken from the seal portion.

Various methods can be used for forming the peelable seal portion. For example, a method of adjusting the seal strength by using a heat-sealable resin as a polymer blend, a method of adjusting the seal strength by heat sealing conditions, a method of controlling the shape of the heat seal head (for example, a point seal), and a method of adjusting the seal strength There is.

Among them, the method using a polymer blend is advantageous for the object of the present invention because a constant sealing strength can be obtained irrespective of the variation of sealing conditions.

A suitable example of a polymer blend is a blend of an ethylene-based polymer and another olefin-based resin.
Examples of the ethylene polymer include low-density polyethylene (LDPE) and linear low-density polyethylene (LLDP).
E), ethylene-vinyl acetate copolymer, ionomer,
And ethylene- (meth) acrylate copolymers. Other olefin resins include, for example, polypropylene, propylene-ethylene random to block copolymer, polybutene-1, butene-ethylene copolymer, butene-propylene copolymer, poly-4-methylpentene-
1 and the like. The ethylene-based polymer and the other olefin-based resin are preferably used by blending at a weight ratio of generally 95: 5 to 30:70, particularly 92: 8 to 40:60.

By providing the above-mentioned blend on the surface of the usual heat-sealable olefin resin exemplified above, it is possible to impart easy peelability.

[Production of Easy-Opening Packaging Pouch] The easy-opening packaging pouch of the present invention is similar to the pouch container wall material except that the above-mentioned weakened portion, tearing property and easy peeling property are used. It is manufactured by a method known per se. For example, the edges of the pouch container wall forming laminate are overlapped and heat-sealed, thereby forming a jointed seal portion, and folding the jointed palm in a state including the unsealed portion to include the contents. Heat seal both edges with
It is manufactured by cutting the notch if necessary. The scar or score may be formed in advance on the laminate before packaging, or may be applied after packaging. Heating with a heat seal bar is appropriate for heat sealing, but an ultrasonic seal, a dielectric heat seal, or the like can also be used.

[0072]

The present invention is further described by the following examples. In addition, the measurement in an Example was performed as follows.

[Measurement Method of Opening Strength] As shown in FIG. 16, at the time of opening, one folded portion 15b of the gusset portion to be gripped by hand is fixed to the jig 101, and the other gusset to be gripped in the same manner. The two tapes 102 were stuck so as to sandwich the portion 15a so as to be parallel to the longitudinal direction of the edge seal portion and protrude sufficiently long from the edge. Then, the end of the tape 102 was 300 mm using a tensile tester.
The gusset was pulled in the direction of tearing the valley fold at a rate of / min, and the maximum strength at the start of opening was evaluated as the opening strength.

[Measurement Method of Heat Seal Strength] The heat seal strength in the direction parallel to the longitudinal direction of the edge sealing portion of the pouch and the direction perpendicular thereto were measured. A strip having a width of 15 mm was cut out in the direction parallel to the sealed width, and a T-type peel strength was measured at a rate of 300 mm / min using a tensile tester, and the average value was evaluated as the heat seal strength.

[Evaluation Method of Opening Property] When the gussets with the scars were respectively gripped and opened with the gussets opened, breakage or delamination occurred at an unintended location of the pouch substrate. The samples were evaluated as defective, and those with a defect rate of 0% were excellent, those with a defect rate of 20% or less were good, those with a defect rate of 40% or less were acceptable, and those with a defect rate exceeding 40% were unacceptable.

[Evaluation Method of Pressure Resistance of Pouch] A pouch was prepared using a solid bath agent as a content, and the pouch was held at 0.8 atm for 30 minutes, and it was evaluated whether the bag was broken during that time. The number of specimens was set to 50, ○ indicates that there was no broken bag, and X indicates that one of the bags was broken.

[0077] Eleven types of laminates shown in Table 1 were prepared.

[0078]

[Table 1] Note 1) The symbol “/” in the table indicates the bonding surface by sandwich lamination, and the bonding surface between PET and Al was coated with a urethane-based anchor agent as needed. Also,
The symbol indicates an adhesive surface dry-laminated using a urethane-based adhesive. Note 2) The values in parentheses in the table indicate the thickness of each substrate. Note 3) In the table, the base materials indicated by the abbreviations are as follows. PET: a biaxially stretched polyester terephthalate film having a laminate surface printed thereon. LDPE: low density polyethylene layer for extrusion coating. Al: aluminum foil. LLDPE-1: Low density polyethylene (LDPE), linear low density polyethylene (LLDPE) and polybutene-1 (PB-1) having a heat-seal surface of 5 μm in thickness are 60 /
A two-layer coextruded film mainly composed of a layer blended at a weight ratio of 20/20 and a low-density polyethylene layer. LLDPE-2: A film having the same configuration except that the mixing ratio between LLDPE-1 and the blend layer is different. Mixing ratio is LDPE
/ LLDPE / PB-1 = 20/70/10 (weight ratio). LLDPE-3: A film having the same configuration except that the mixing ratio between LLDPE-1 and the blend layer is different. Mixing ratio is LDPE
/ LLDPE / PB-1 = 20/60/20 (weight ratio). LLDPE-4: A film having the same configuration except that the mixing ratio between LLDPE-1 and the blend layer is different. Mixing ratio is LDPE
/ LLDPE / PB-1 = 53/17/30 (weight ratio). LLDPE-5: A film having the same configuration except that the mixing ratio between LLDPE-1 and the blend layer is different. Mixing ratio is LDPE
/ LLDPE / PB-1 = 45/15/40 (weight ratio). LLDPE-6: A film similar to LLDPE-1, but previously subjected to three scoring processes at 1.5 mm intervals in parallel with the longitudinal direction of the film. The width of the score was 0.5 mm and the depth was about 25 μm. LLDPE-7: LLDPE monolayer film. PA-1: A biaxially stretched nylon 6 film subjected to scoring in the same manner as LLDPE-2. The width of the score was 0.5 mm and the depth was about 13 μm. UOPP: A uniaxially stretched polypropylene film obtained by printing on a laminate surface by rolling. PA-2: A biaxially stretched film composed of a blend of nylon 6 and aromatic nylon, which is preferentially stretched in the longitudinal direction of the film, and exhibits linear tearability in this direction. PP / PS: a cast film made of a blend of polypropylene and polystyrene and showing a linear tear property in the longitudinal direction of the film. In this film, in a cross section parallel to the tearing direction, the PS layer is dispersed in a fibril-like form,
The PP layer and the PS layer formed a sea-island structure in a perpendicular section.

Example 1 A band having a width of 5 mm consisting of a plurality of scars was formed on the surface of the outer layer film of the laminate 1 exhibiting the easy peeling property by using a disc-shaped grindstone in the longitudinal direction of the film. As a content, a pillow-packed pouch with a gusset was prepared. At this time, the width of the edge sealing portion was 7.5 mm.
The band of the scar was positioned at the valley fold of one of the gussets, and the jointed palm was positioned at the center of the pouch. Opening each has two mountain folds of gusset with scratches,
The gusset was opened by pulling the mountain-folded part of the gusset, which was on the upper side, when the palm was put down. The opening strength, heat sealing strength, opening property, and pressure resistance were evaluated by the methods described below. Table 2 shows the obtained results.

Example 2 A pouch was prepared under the same conditions as in Example 1. The pouch was evaluated in the same manner as in Example 1 except that the pouch was opened in the opposite direction to that of Example 1. Table 2 shows the obtained results.

Comparative Examples 1 and 2 Example 1 was repeated using a laminate 3 having no easy peelability.
Pouches were prepared under the same conditions as in No. 2 and evaluated in the same manner. Table 2 shows the obtained results.

Comparative Example 3 A laminate 1 having easy peelability was used, but a pouch was prepared under the same conditions as in Example 1 without providing a weakened portion at the valley-folded portion of the gusset, and evaluated similarly. Table 2 shows the obtained results.

In Example 1, the opening operation could be easily performed in the form shown in FIG. 6 without the opening operation being hindered by the contents. In Example 2, the package could be opened in the form shown in FIG. 6 or 7. In each case, the contents were easily taken out because of the large opening. On the other hand, Comparative Examples 1 to
In the case of No. 2, the heat seal strength is about 2 kgf / 7.5 m
As shown in FIG. 13, defects such as breakage and delamination occurred at unintended portions of the pouch base material. In Comparative Example 3, the opening strength was 3 k.
It was as high as gf, and it was difficult to start opening.

Examples 3 to 6 Using the laminates 2 to 5, pouches similar to those in Example 1 were prepared, and the relationship between heat seal strength, openability, and pressure resistance was examined. Table 2 shows the obtained results.

In Examples 3 to 6, with respect to the openability, Example 3 showed that the delamination between PET and LDPE was 30% of the number of specimens.
As in Example 1, the opening operation was easily performed in the form shown in FIG. Regarding the pressure resistance, in Examples 3, 4, and 5, no bag breakage was observed as in Example 1.
Broke everything.

Examples 7 and 8 Pouches were prepared and evaluated in the same manner as in Example 1 except that the seal width of the edge sealing portion was changed to 5 mm and 10 mm using the laminate 2. Table 2 shows the obtained results.

By changing the seal width, the unsuccessful opening rate did not change, but the opening strength could be adjusted.

Examples 9 and 10 The laminate 6 in which a score is engraved on a part of the layers of the laminate
The pillow-packed pouch with gusset as in Example 1 was prepared in the same manner as in Example 1 except that the positions of the scores of and 8 were located at the valley folds of the gusset, and one solid bath agent was used as the content. These pouches were evaluated as in Example 1. Table 2 shows the obtained results.

In the ninth and tenth embodiments, the opening operation could be easily performed in the form shown in FIG. 6 without the opening operation being hindered by the contents. In addition, since the opening was large, it was easy to take out the contents. From these evaluation results, it was found that the weakened portion could also be formed by a score provided on some constituent members of the laminate. The opening was started with the score closest to the gusset valley fold line.

Examples 11, 12, and 13 Using the laminates 1, 9, and 11, using two wafers as contents, a weakened portion due to a plurality of scars was formed in the valley-folded portion of the gusset as in Example 1. Pillow packaging pouches were made. In addition, a second weakened portion was formed by an I notch near the end of the gusset where opening was not started. Evaluation was performed in the same manner as in Example 1. Table 2 shows the obtained results.

Examples 14, 15, 16 Using the laminates 1, 8, and 10, the second weakened portion was formed at the bent portion of the gusset where the opening of the pouch was not started due to a plurality of scars. Pouches were prepared under the same conditions as in Examples 11 to 13, and the same evaluation was performed. Table 2 shows the obtained results.

Example 17 A printing surface of a printed biaxially oriented polypropylene film having a thickness of 30 μm was coated with a releasable varnish, and the other surface to be heat-sealed was part-coated with an aqueous cold seal material. A pressure-sensitive pouch substrate was prepared. Using this base material, a pouch was prepared under the same conditions as in Examples 11 to 13, and the same evaluation was performed. Table 2 shows the obtained results.

In Examples 11 to 17, the base material was torn by the second weakened portion as a trigger without damaging the contents, and could be easily opened in the form shown in FIG. Since the opening was large, the contents could be easily taken out. In particular, in the pouches of Examples 12, 13, 15, and 16 in which a straight-line tearing property was imparted in the longitudinal direction of the palm joint, the base material starts to be unsealed, and the gusset weakened portion and the second weakened portion start in parallel. It was torn straight and had an excellent open appearance.

[0094]

[Table 2]

[0095]

According to the present invention, when the two gussets of the gusset with the scar are respectively gripped and the gusset is opened with the gusset opened, the gusset is opened by tearing and peeling in the pouch surface. Even if the contents are fragile or easily deformed, the contents can be opened without damaging the contents. In addition, since the size of the pouch can be made to fit the contents, the amount of the base material used can be minimized. In addition, since the opening can be made large, the contents can be easily taken out. Furthermore, the opening can be reliably performed by providing a weakening line for imparting tearing directionality or using an easily tearable resin layer. In addition, the present invention can be applied to any pouch having a gusset. For example, the present invention can be applied not only to a pillow package with a jointed palm but also to an envelope. Further, the present invention can be applied to a two-side seal pouch using an inflation film.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a pillow packaging pouch with a gusset according to the related art in which an opening notch is provided in an edge seal portion.

FIG. 2 is a diagram exemplifying a state in which a solid material having substantially the same size as the inner size of a bag is put into the pouch shown in FIG. 1 and opened.

FIG. 3 is a view exemplifying a pillow packaging pouch with a gusset according to a conventional technique in which a rough surface for opening is provided in a bent portion on a side surface of a pouch to enable lateral tearing, and FIG.
(B) is a perspective view of a cross section taken along line AA.

FIG. 4 is a view exemplifying a gusseted pillow packaging pouch according to the prior art, in which an opening surface is provided at the base of the jointed palm and an easily peelable sealing material is used for an edge sealing portion.

5A and 5B are diagrams illustrating an opening start portion of the easy-open pouch of the present invention, wherein FIG. 5A is a perspective view, and FIG. 5B is a cross-sectional view of an example in which a weakened portion is provided by a scar.

FIG. 6 is a perspective view illustrating an example of a state when the easy-open pouch of the present invention is opened.

FIG. 7 is a perspective view illustrating another example of a state when the easy-open pouch of the present invention is opened.

FIG. 8 is a perspective view illustrating still another example of a state when the easy-open pouch of the present invention is opened.

FIG. 9 is a view exemplifying a gusseted pouch having heat-sealed corners to which the present invention is applied.

FIG. 10 is a diagram illustrating a state when the pouch shown in FIG. 9 is opened.

FIG. 11 is a diagram illustrating a case where a second notch or a weakened portion is provided in the edge seal portion.

FIG. 12 is a cross-sectional view of a heat seal edge outside an edge seal portion, and illustrates stepwise how a constituent member of a pouch is broken by opening.

FIG. 13 is a diagram illustrating an example of unsuccessful opening observed when an edge seal portion is not used as a peelable seal.

FIG. 14 is a diagram illustrating a gusseted pillow packaging pouch provided with a hole for display at an edge seal portion to which the present invention is applied.

FIG. 15 is a diagram illustrating a gusseted three-way seal pouch to which the present invention is applied.

FIG. 16 is an explanatory diagram of a method for measuring the opening strength.

Claims (7)

[Claims] 1. A pouch having a gusset and an edge seal portion, wherein the gusset portion has a weakened portion and a torn portion of the pouch container wall at least in a valley-folded portion serving as an opening start portion, and the edge seal portion is provided. An easily-openable pouch, which is an easily-peelable seal and can be opened by peeling an edge seal portion from a gusset portion. 2. A pouch having a gusset, a palm joint, and an edge seal portion, wherein the gusset portion has a weakened portion and a torn portion of a pouch container wall at least in a valley-folded portion serving as an opening start portion. An easy-opening pouch, characterized in that the seal portion and the gasket are an easily peelable seal, and the seal can be opened by peeling off the edge seal and the gasket from the gusset. 3. A pouch having a gusset and an edge seal portion, wherein the gusset portion has a weakened portion and a torn portion of the pouch wall at least at a valley fold portion serving as an opening start portion, and the edge seal portion is provided. An easily peelable seal having an opening notch or a weakened portion at a position separated from the valley folded portion of the edge seal portion, peeling the edge seal portion from the gusset portion, and using the opening notch or the weakened portion as a trigger. An easily-openable pouch, which can be opened by tearing a material. 4. The pouch wall according to claim 1, wherein said torn portion comprises a weakening line provided on at least one layer of the pouch wall forming material.
An easy-open pouch according to any one of the above. 5. The easy-opening pouch according to claim 1, wherein the portion to be torn is formed of an easily tearable resin layer provided on at least one layer of a pouch wall forming material. . 6. The easy-open pouch according to claim 5, wherein the easily tearable resin layer is a resin film layer that is preferentially stretched in a tear direction. 7. The easy tearable resin layer according to claim 5, wherein the easily tearable resin layer is formed of a plurality of resin blends having a sea-island structure in a cross section perpendicular to the tearing direction and a dispersed phase extending in the tearing direction. Openable pouch.