JPH0986547A - Easily openable pillow packaging pouch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate opening of a pouch and taking-out of a content without damaging the content by providing a weakened part along a base of a butt joining attachment, and providing a peelable seal part on a part of an edge seal part. SOLUTION: A butt-joining attachment 1 and edge seal parts 2, 2 are provided, a weakened part 9 along a base 8 of the butt-joining attachment is provided on a cross part 7 between the butt-joining attachment 1 and the edge seal part 2, or on the edge seal part 2, and a peelable seal part is formed on a part of at least one of the edge seal parts from the edge seal part at the base 8 of the butt-joining attachment. The cross part 7 between the butt-joining attachment 1 and the edge seal part 2 is held by the finger tip, and pulled it upward to start the tearing from the weakened part 9 provided on the cross part 7 along the base 8 or the edge seal part 8. The peeling of the peelable seal part is advanced with the edge seal part at the base 8 of the butt-joining attachment as a starting point, and in addition, the tearing of a wall of a pouch is also advanced along the butt-joining attachment to smoothly proceed the opening.

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, in a pillow packaging pouch having a paw seal and both end edge seal portions, the pouch can be easily opened along the pouch. Regarding openable pouch.

[0002]

2. Description of the Related Art Pillow packaging pouches having a seal and a seal on both edges have been widely used as a package for easily packaging solid foods or parts.

As shown in FIG. 1 (prior art), such a pillow wrapping pouch is provided with a joint 1 and both end edge seal portions 2 and 2, and both end edge seal portions 2 and 2 have a notch 3.
The type provided with is widely used.

Japanese Examined Patent Publication No. 61-39228 discloses that FIG.
As shown in (Prior Art), at least three directions, that is, 1
In a plastic sealed subdivided bag formed by fusing (sealed together), 2 and 2 (both edges seal portions), a large number of scratches 4 are densely gathered on the edge line at the fusion portion of the sheets constituting the bag. The sealed subdivision bag provided is described.

Further, Japanese Utility Model Publication No. 6-47783 discloses that
As shown in FIG. 4 (prior art), in a laminate film for a packaging bag formed by laminating a plurality of plastic films, the plastic film located on one side of the plastic laminate film has an edge of the packaging bag to be formed. A narrow opening rough surface 5 that extends in a meandering direction in the folding line direction is provided at a position corresponding to the bent portion that is located. The rough opening surface 5 is provided on the scratched portion formed on the plastic film and the scratched portion. Described is a plastic laminate film for a packaging bag, which is formed from a filled plastic material.

[0006]

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

For example, in the case of the known pouch shown in FIG. 1, as shown in FIG. 2, when the content 6 is a solid material having substantially the same size as the inner size of the bag, the content hinders tearing. The tearing direction is misaligned and it is difficult to open.

Further, the known pouch shown in FIG. 3 has a feature that all the seal edges have a scar, and therefore the pouch can be torn and opened from anywhere.
In addition to having the same problem as the pouch of FIG. 1, not only is it complicated to process because scratches must be made on all the seal edge portions, but it is difficult to obtain stable performance because the number of processing points increases. .

Further, in the case of the known pouch of FIG. 4, when the content is a solid material having a size substantially the same as the inner size of the bag, it has the same problem as the pouch of FIG. 1 and the range in which it can be opened is limited. At the same time, when you pick the part that starts tearing with your fingers, you will also pick the contents together, so the contents will crack (for example, biscuits or wafers) or deform (for example, There is the problem of something like yokan). Especially when the contents are thick (for example, a film with lens or soap), a pouch with a gusset as shown in Fig. 4-b is preferably used, but in this case, the above-mentioned problems become remarkable. Not only that, it is difficult to start the opening itself, and even if the opening is successful, it will be difficult to open it to the end. In addition, the number of parts that must be processed increases, and the processing becomes complicated.

As a simplest method for improving the problems of these pouches, it is conceivable to make the pouch large enough for the contents, but in this case, a pouch base material is often used. There is a problem that impairs the characteristics of pillow packaging that must be done.

That is, the object of the present invention is to prevent unsealing of the contents even if the contents are almost the same size as the inner size of the bag and are thick solids, and
It is an object of the present invention to provide a pillow packaging pouch that can be opened and taken out easily without damaging the contents.

Another object of the present invention is to provide a pouch which exhibits stable performance by minimizing the processing for opening.

[0013]

According to the present invention, in a pillow packaging pouch having a palm-sealing sticker and both-ends edge seal portions, the palm-sealing sticker is applied to the crossing portion between the palm-sealing sticker and the end-edge seal portion or to the end-edge seal portion. A weakened portion provided along the root, a peelable seal portion provided on at least a part of at least one edge seal portion from the edge seal portion in the joint sticking root, a grip portion formed by joint sticking, and a joint Provided is an easily-openable pouch which is composed of a torn portion of a pouch device wall along a sticking and which can be opened along a pouch sticking.

In the pillow packaging pouch of the present invention, the joint-sealing is provided with a wide seal portion and an unsealed portion provided between the base of the joint-sealing and the seal portion.
It is preferable that a tearable portion is formed in this unsealed portion.

In the present invention, the tearing portion of the pouch wall is formed by setting the tearing start strength to be smaller than the tearing strength of the pouch wall on the opposite side of the parchment at least at the opening start portion. To be done.

[0016]

The pillow packaging pouch according to the present invention has the palm-sealing sticker 1 and both end edge seal portions 2 and 2 as shown in FIG. 5 and FIG. 6 or FIG. 2 is provided with a weakened portion 9 along the joint 8 which is attached to the palm-sealing portion 7 or the edge-sealing portion 2 and is peeled from at least a part of at least one of the edge-sealing portions from the edge-sealing portion of the joint-sealing root 8. It is a remarkable feature that the elastic seal portion 10 is formed, and the paw sticker 1 is used as a gripping portion, and the pouch wall along the pouch sticker is used as a tearing portion, so that the seal can be opened along the sticker.

As will be described below, the vessel wall 11 along the joint 1 has a planned tearing portion which is set so that the tear initiation strength is smaller than the strength of the pouch 12 on the opposite side of the joint. Has been formed.

A crossing portion 7 between the seal-attaching sticker 1 and the edge seal portion 2
When is held with a fingertip and pulled upward, the tearing is started from the weakened portion 9 provided on the crossing portion 7 or the edge seal portion 2 along the base 8. At the same time, in the pouch of the present invention, since the peelable seal portion 10 is provided on at least a part of at least one of the edge seal portions from the edge seal portion of the joint-attached root 8, the edge seal portion of the joint-attached root 8 is removed. As a starting point, peeling of the peelable seal portion 10 progresses, and further tearing of the wall of the pouch along the joint bonding also progresses, so that opening of the pouch progresses smoothly.

In the pillow packaging pouch of the present invention, both the weakened portion 9 and the peelable seal portion 10 described above are combined to facilitate the smooth tearing and opening of the pouch. That is, the start of tearing from the weakened portion 9 is caused by the peelable seal portion 10.
The peeling start position is defined so that the peeling can proceed smoothly and easily, and the peeling at the peelable seal portion 10 facilitates the tearing of the pouch device wall from the weakened portion 9 along the joint bonding. It also assists in advancing.

In the case of FIG. 6, the tearing of the wall of the pouch is performed so that one of the tearing edges is along the root of the joint sticking, and the peeling at the peelable seal portion is one end with respect to the joint sticking root. It is performed on the entire edge seal. On the other hand, in the case of FIG. 7, the tear of the pouch device wall is performed along one of the tear edges along the root of the joint sticking, and the peeling at the peelable seal portion is one of the edge seal portions with respect to the joint sticking root. Done in some aspects, i
The wall of the pouch is also torn at the end position of the peeling triggered by the second weakened portion 9a by the notch.

As shown in FIG. 5, the pillow packaging pouch of the present invention has an unsealed portion 14 with a small gap W between the joint portion 1 and the seal portion 13 on the joint portion 1 and the seal portion 13. Is preferably provided, and the unsealed portion 14 is preferably the portion to be torn.

In this case, since the unsealed portion 14 is provided between the base 8 of the palm-sealed sticker and the seal-sealed sticker portion 13, the stress at the time of ripping is concentrated on the unsealed portion 14 of the saddle-sticker 1 and As shown in FIG. 6 and FIG. 7, tearing of the wall of the pouch is performed smoothly along the unsealed portion where the pouch is attached.

Gassho sticking is sealed up to the base,
If there is no unsealed part between the base of the seal and the seal, the tearing force will not concentrate on the base and the tear will proceed in a direction that is about 45 degrees wider than the direction of the seal. As long as no special tearing property is given, smooth opening cannot be expected. On the other hand, in the embodiment shown in FIG. 5, the tear started from the weakened portion always enters the vessel wall of the unsealed portion of the joint-sealed joint, so that the tear opening along the joint-sealed root is possible.

FIG. 11 is a cross-sectional view of a heat-sealing edge outside the edge-sealing portion, which is a step-by-step illustration of how the pouch member is broken by opening. I shows the state after the edge sealing. In the peel wrapping pouch, the palm-sealed sticker 1 is heat-sealed, and then the palm-sealed sticker 1 is bent to heat-seal the edge portions 2 and 2. At this time, the end-edge seal portions 2 and 2 and the end of the unsealed portion 14 of the palm-sealed sticker 1 are folded. The edges are also heat-sealed. II Gasoline bonding 1
Shows the state that caused. At this time, when a force is applied in the direction of the arrow, the stress is concentrated near the point P of the root 8 of the joint pad 1. A member on the side of the valley fold 8 of the joint 1 is broken near the point IIIP, and the stress acts on the edge seal portion. The IV peelable edge seal portions 10 and 10 are peeled off and opened in a form as shown in FIG. In addition, the base 8 of the joint sticking
From the second weakened portion 9a to the edge seal portion at a constant interval from
It becomes possible to open in the form as shown in FIG. 7 by providing.

In order to achieve the intended purpose of the present invention of facilitating the start of opening, in the vicinity of the base of the joint pad,
A weakened portion 9 due to a scar, a score, a notch, or the like is provided on at least one of the base material portions for forming a palm. As shown in FIG. 5B, it may be provided on the valley fold side or on the opposite side as shown in FIG. 5C, and as shown in FIG. When it is provided on the material portion, there is no restriction on the opening direction, and tearing in the opposite direction of FIG. 11 is also possible. When the weakened portion is provided on only one side of the base material portion for forming the palm-sealing, it is preferable to display the opening direction.

In order to achieve the other object of the present invention to surely promote the tearing to the unsealed portion of the palm-sealed joint, it is important to provide the unsealed portion at the base portion of the joint-sealed seam as described above. Is.

Further, in order to surely advance the tear to the unsealed portion in the vicinity of the base of the joint stick, and at the same time to make the tear proceed straight along the joint stick, in order to achieve the object of the present invention, It is important to provide a weakening line near the base or an easily tearable resin layer.

According to the present invention, according to the above, even if the content is approximately the same size as the inner size of the bag, and even if it is a thick solid material, the opening is not hindered by the content, and The contents can be easily opened and taken out without damaging the contents.

[0029]

Preferred Embodiment of the Invention

[Pouch wall] In the present invention, the flexible material forming the pouch wall is an olefin resin for imparting heat sealability, a stretched plastic film for imparting mechanical strength or heat resistance, oxygen, etc. A plurality of combinations of a metal foil, a gas barrier resin, a vapor-deposited film, etc. for imparting a gas barrier property to the above are used in the form of a laminate.

The heat-sealable resin film is generally a low-, medium-, high-density polyethylene, linear low-density polyethylene, isotactic or polymer which is polymerized using a catalyst such as a Ziegler-Natta catalyst or a metallocene catalyst. Syndiotactic polypropylene, propylene-
Ethylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methyl methacrylate copolymer, ion-crosslinked olefin copolymer (ionomer), ethylenically unsaturated carboxylic acid or its anhydride 1 type or 2 types of modified olefin resins such as olefin resins graft-modified with; polyamides or copolyamide resins having a relatively low melting point or low softening point; polyesters or copolyester resins having a relatively low melting point or low softening point; A combination of the above is used. These films preferably have a thickness of 15 to 100 μm.

As the film other than the heat-sealable resin, polyester films such as polyethylene terephthalate, polybutylene terephthalate and ethylene terephthalate / isophthalate copolymers: nylon 6,
Polyamide films such as nylon 6,6, nylon 11, nylon 12, etc .: propylene polymer film: polyvinyl chloride film: polyvinylidene chloride film: ethylene vinyl alcohol copolymer film 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 tearability can be obtained in the molecular orientation direction.

As the metal foil used for imparting the gas barrier property, various surface-treated steel foils and light metal foils such as aluminum are used. As the surface-treated steel foil, cold-rolled steel foil subjected to one or more surface treatments such as zinc plating, tin plating, nickel plating, electrolytic chromic acid treatment and chromic acid treatment, or prior to final rolling. It is possible to use a surface-treated steel foil obtained by performing the above-mentioned plating treatment followed by cold rolling treatment. As a light metal foil,
Besides so-called pure aluminum foil, aluminum alloy foil is used. 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 laminating. The protective coating is formed by providing a protective coating. As the protective coating, any protective coating composed of thermosetting and thermoplastic resins: modified epoxy coating such as phenol-epoxy coating, amino-epoxy coating, etc .: vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate Copolymer partially saponified product, 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 -Synthetic rubber-based paints such as butadiene-based copolymers are used alone or in combination of two or more. 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, when the resin paint is thermosetting, the paint is baked if necessary. From the viewpoint of corrosion resistance and workability, the protective coating is generally 2 to 30 μm, especially 3
It is desirable to have a thickness (dry state) of 20 to 20 μm.

As the gas barrier resin, a thermoformable thermoplastic resin having a low oxygen permeability coefficient is used. The most suitable examples of the gas barrier resin include ethylene-vinyl alcohol copolymer,
For example, the ethylene content is 20 to 60 mol%, especially 2
A saponified copolymer obtained by saponifying an ethylene-vinyl acetate copolymer having a content of 5 to 50 mol% so as 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 generally has a phenol: water weight ratio of 85: 1.
It is desirable to have a viscosity of 0.01 dL / g or more, particularly 0.05 dL / g or more, measured at 30 ° C. in the mixed solvent of No. 5.

Further, as another example of the gas barrier resin having the above characteristics, polyamides having 5 to 50, especially 6 to 20, amide groups per 100 carbon atoms; eg 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 and the like are used. These polyamides should also have a molecular weight sufficient to form a film and have a relative viscosity (ηre) measured at a concentration of 1.0 g / dL in concentrated sulfuric acid and a temperature of 30 ° C.
It is desirable that l) is 1.1 or more, particularly 1.5 or more.

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

As the vapor-deposited film, a film obtained by vapor-depositing an inorganic metal compound such as silicon or aluminum based on cellophane, polyethylene, polypropylene, polyvinyl chloride, polyester, polyamide or the like is used.

Suitable examples of the laminate include olefin resin heat seal layer / uniaxially stretched polypropylene film, olefin resin heat seal layer / biaxially stretched nylon film, olefin resin heat seal layer / biaxially stretched polyethylene terephthalate film, Olefin resin heat seal layer / aluminum foil / biaxially stretched polypropylene film, olefin resin heat seal layer / aluminum foil / biaxially stretched nylon film, olefin resin heat seal layer / aluminum foil / biaxially stretched polyethylene terephthalate film, olefin Resin heat seal layer / ethylene vinyl alcohol copolymer / biaxially stretched polyester film, olefin resin heat seal layer / amorphous aromatic polyamide / biaxially stretched 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 total thickness of the laminate is 10 to 200 μm, especially 30 to 15
It is preferably in the range of 0 μm.

The laminated body is manufactured 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 adhesive, an epoxy adhesive, an acid-modified olefin resin adhesive can be used.

The sandwich lamination is performed by extruding an arbitrary resin between the films or between the film and the metal foil, and the extrusion coating is extruding an arbitrary resin on the film or the metal foil. Done by. The resin to be extruded is generally low-, medium-, high-density polyethylene, linear low-density polyethylene, isotactic or syndiotactic polypropylene, propylene-ethylene copolymer,
Ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methyl methacrylate copolymer, ion-crosslinked olefin copolymer (ionomer), graft-modified with ethylenically unsaturated carboxylic acid or its anhydride Modified olefin resin such as olefin resin; polyamide or copolyamide resin having relatively low melting point or low softening point;
A polyester or copolyester resin having a relatively low melting point or a low softening point; a blend resin containing one or more of the above resins and / or a known filler; It A urethane-based or titanate-based anchor agent can be applied to the surface on which the extruded resin layer is applied.

[Peelable Seal] In the present invention, the peelable seal portion is formed so as to extend from the edge seal portion of the joint-attached root to at least a part of at least one edge seal portion. The peelable seal refers to a sealed state in which an airtight sealed state is maintained during normal handling, but easy opening with a fingertip. The appropriate heat-sealing strength of the peelable seal portion varies depending on the structure and application of the pouch substrate, but is generally 2 kg or less, more preferably 1.5 kg or less in terms of 15 mm width.

By maintaining the heat-sealing strength of the peelable seal portion in the above-mentioned appropriate range, tearing of the vessel wall and peeling of the seal portion proceed in a well-balanced manner. That is, FIG. 11 is a cross-sectional view of a heat-sealing edge outside the edge-sealing portion, showing a step-by-step manner in which the base material of the pouch of the present invention is destroyed at the start of opening,
It can be seen that peeling proceeds following tearing. on the other hand,
FIG. 12 is a view exemplifying a defect observed when the heat seal strength of the peelable seal is higher than necessary. That is, when the heat seal strength of the peelable seal is higher than the material breaking strength of the base material and the strength that induces delamination, defects such as shown in FIG.
V'-1), rupture of the vessel wall on the opposite side of the joint (IV'-2)
And delamination (IV'-3) of the wall laminate occurs.

Various methods can be used to form 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 according to heat-sealing conditions, a method of controlling the shape of the heat-sealing head (for example, point-sealing), and adjusting the seal strength, As described in Examples, there are a method of utilizing the adhesive strength between the cold seal material and the base material, a method of utilizing heat transfer to form a peelable seal only on a necessary portion, and the like (JP-A-5-178332).

Among these, the method using the polymer blend is advantageous in the present invention because a constant sealing strength can be obtained regardless of the change of the sealing conditions.

Suitable examples of polymer blends include polyethylene, such as low density polyethylene (LDPE), linear low density polyethylene (LLDPE) in amounts of 50% by weight or more, especially 60 to 95% by weight of other olefinic resins such as polypropylene, Propylene-ethylene random or block copolymer, polybutene-1, butene-ethylene copolymer, butene-propylene copolymer, poly-4-methylpentene-1, etc. were blended in an amount of less than 50% by weight, particularly 5 to 40% by weight. It is a blend. In order to improve the dispersibility of both, an ethylene-vinyl acetate copolymer, an ionomer or the like may be added in a small amount.

On the contrary, it is also possible to use a blended product containing a propylene-based polymer as a main component and a small amount of an ethylene-based polymer added thereto.

In the present invention, the peelable seal portion 10 is
It may be provided on the edge seal portion on one side or on the edge seal portions on both sides with reference to the base of the sticking of the palm. Further, it may be provided on all of the both end edge seal portions.
This is because the peeling start side of the peelable seal portion is defined by the weakened portion described above, and when the width of the peelable seal portion is defined to be small, a second weakened portion is provided and the second weakened portion is provided. This is because the peeling may be completed at the weakened portion of.

[Part to be torn] Various means can be used to impart tearability to the part to be torn of the wall of the pouch. As described above, by imparting a high degree of uniaxial orientation to the resin film, tearability in the orientation direction can be imparted. The degree of orientation is 0.00
It may be one that gives a birefringence (Δn) of 1 or more, particularly 0.005 or more. Although the resin film is biaxially molecularly oriented, it should be understood that the uniaxial orientation may be significant.

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

The resin forming the continuous phase in this blend may be an olefin resin, while the resin forming the dispersed phase may be another olefin resin incompatible with the continuous phase. , Styrene-based polymers, polyester-based polymers, polycarbonate-based polymers, polyamide-based polymers and the like. Of course, the latter resin may be the continuous phase and the former resin may be the dispersed phase.
50% by weight or more, especially 55 to 90% by weight of the resin constituting the continuous phase, less than 50% by weight of the resin constituting the dispersed phase,
It is particularly preferable to use it in an amount of 10 to 45% by weight.

The size of the dispersed phase is not particularly limited, but in the 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 value (Dt / Dn) of the ratio of the diameter (Dt) in the width direction to the diameter in the thickness direction is preferably 10 or less, particularly 6 or less, and the extent of extending in the tearing direction is 20 or more. In particular, it 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 wall of the pouch can also be imparted by forming a mechanically weakened portion in at least one layer of the laminated body, for example, a scar or a score described later.

[Gasho] In the pillow package of the present invention, as shown in FIG. 5, a small space W is provided between the base 8 and the seal-attaching seal portion 13 in addition to the seal portion 13 in the gassho-attachment 1. The unsealed portion 14 is provided. The size of the cross-sealing is generally about 5 to 25 mm, but the width W of the unsealed portion is generally 10 mm or less, particularly about 0.3 to 5 mm, which is 5 to 50% of the width of the cross-sealing.
It should be in the range of degree. Width W of unsealed part when opening is triggered by weakened part due to multiple scratches
Can be set small.

[Weakened portion for opening opening] In the present invention, the weakened portion 9 is provided along the joint 8 of the palm-sealing sticker 1 or the edge seal portion 2 along the joint 8 of the palm-sealed sticker.
The term "weakened portion" as used herein refers to a portion which is more easily torn or broken than other base material portions and which gives a trigger for tearing, and so-called notches, scores, scars and the like correspond to this.

The following method is adopted for forming the weakened portion. The following method is effective for forming a weakened portion at the base of the palm joint. That is, when heat-sealing the edge seal portion of the pouch, the heat-sealing is performed in a state in which the palm-sealing sticker 1 is bent. Set the score of. In particular, in the base portion of the joint-attached sticking portion that overlaps the edge seal, a linear weakened portion is formed in the bent portion due to the bending and pressure applied during the edge seal. It is also effective to cut the notch.

The shape and size of the scar or score are not particularly limited as long as easy tearing is imparted, but the form of the scar or score is, for example, a dot shape, a dotted line shape, or a linear shape (short line shape, long line shape). Examples thereof include those having a pattern such as a river shape, a C shape, and an X shape, and a mixture thereof. From the viewpoint of easy opening, it is preferable that the scar or score is provided in parallel with the longitudinal direction of the joint sticker, and especially the scar or score is at least 1 centering on the base of the joint sticker.
It is better to provide more than one book. The depth of the scar or score may be such that it does not penetrate through the film layer or the like, or it may penetrate through it, and is appropriately selected in consideration of tearability, airtightness and the like. Further, regarding the density of scars or scores, it is preferable that the average distance between adjacent scars or scores is within 3 mm, and particularly within 2 mm.

The range in which the scratches or scores are provided is provided on at least one of the bases for forming the palm of the pouch edge seal portion near the base of the palm of the palm (FIGS. 5B and 5C). In particular, since the linear weakened portion is formed in the valley-folded portion as described above, it is effective to provide it as shown in FIG. 5B. When it is provided on both base materials ((d) of FIG. 5), there is no restriction on the opening direction, and opening in the opposite direction of FIG. 11 is possible. Of course, there is no problem even if the scratches or scores extend beyond the pouch edge seal portion and reach the portion to be torn. That is, it can be linearly provided in the vicinity of the base of the joint sticker in parallel with the longitudinal direction of the joint sticker so as to have a certain width by a plurality of scratches or scores.

The layer on which the scars or scores are provided may be any layer of the pouch wall laminate, that is, any of the outer layer, the intermediate layer, and the inner layer, but it is desirable to provide it on a substrate that is difficult to stretch and breaks easily.

The method of cutting the scratches or scores may be any method known per se, for example, processing with a disc-shaped or roll-shaped grindstone, disc-shaped or roll-shaped with a plurality of protrusions or cutting edges formed on the surface. Processing by a tool, scratch-shaped processing by making a speed difference between the tool and the base material, or score processing known per se is adopted. In addition, laser processing, electric discharge processing, ultrasonic processing, etc. are adopted.

When a notch is provided as the weakening portion for opening the opening, at least one notch is provided only on one side of the base material for forming the palm-sealing, in proximity to the root of the intersection of the seam-sealing and the edge seal portion. The distance D from the base of the palm-stick attachment to the tip of the notch is the shortest, and is preferably within 2 mm, particularly within 1 mm.

Notch shapes are I notch, U notch, and V notch.
The notch may be a notch or another notch, and the notch may be provided only on the unsealed portion of the pouch edge, or may be provided so as to extend to the heat seal edge.

In order to provide the notch on only one of the bases for forming the palm-sealing, prior to heat-sealing the palm-sealing,
It is preferable to engrave a notch in the base material in advance.

[Second weakened portion] In the pouch of the present invention, the second weakened portion can be formed in the edge seal portion at a fixed interval from the joint of the palm-stick, and from the second weakened portion. The tearing of the vessel wall may be performed according to the planned tearing portion of the second pouch vessel wall. Of course, the seal portion between the first weakened portion and the second weakened portion is a peelable seal portion, and after the peeling of this seal portion progresses, the peeling end and the tearing start at the second weakened portion. And will be done.

FIG. 8 shows this example of the present invention.
(A) is an example in which a second weakened portion is provided in a normal pouch,
(B) has shown the example which provided the 2nd weakening part in the pouch with a pleat. In these examples, the part to be peeled off is the area X.
In FIG. 7A, a combination of the I-shaped notch 9a and the edge notch 9a ′ is provided.
In the figure (b), a plurality of scratches 9a ″ are linearly provided with a constant width along the bent portion 15 of the pouch with a gusset. Since the scratches 9a ″ give a trigger for tearing, It does not necessarily have to be provided linearly, and may be provided only in the vicinity of the edge seal portion. For example, the second weakened portion may be a scar formed by forming a protrusion on the end of the surface of the heat seal head and engraving the protrusion.

The form of the pouch of the present invention is not limited to the one described above, and can be applied to any form as long as the above-mentioned requirements are satisfied. That is, as shown in FIG. 10, the present invention is also suitably applied to a pouch in a form used for packaging a film with a lens or the like. In the pouch shown in FIG. 10, a weakened portion due to a scar is provided at least at the opening start portion of the base of the joint pad 1, and the end of the display locking hole 16 formed in one edge seal portion 2 Is provided with second weakened portions 9a, 9a formed by notches. When the second weakened portion is a notch as shown in this figure, the notch may be inclined in the desired tear direction in order to facilitate the tearing. Further, even when the second weakened portion is a scar or a score, it is possible to give directionality, and a similar method is preferably adopted.

[Manufacture of pillow packaging pouch] In the pillow packaging pouch of the present invention, the edges of the pouch wall forming laminate are overlapped and heat sealed, thereby forming a seal-sealed seal portion, and an unsealed portion. It is manufactured by bending a plywood sticker in a state of containing, and heat-sealing both end edges in a state of containing a content, cutting, and forming a weakened portion if necessary. The scratches or scores or notches may be preformed on the laminate before packaging or may be applied after packaging. Heating with a heat seal bar is suitable for heat sealing, but ultrasonic sealing, dielectric heat sealing, or the like can also be used.

In the present invention, the contents can be taken out easily by changing the position of the sticking of the palm. For example, the puffing stick may be provided near the center of the pouch, or the position of the plucking stick may be shifted from the center.

[0069]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the following examples.

Eight types of pillow packaging laminates shown in Table 1 below were prepared.

[Table 1] Note 1) / symbol in the table indicates the adhesion surface by sandwich lamination, and the adhesion surface of PET and Al is coated with urethane-based anchor agent as needed. Also,·
The symbol indicates an adhesive surface dry-laminated using a urethane 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 abbreviations are as follows. PET: Biaxially stretched polyethylene terephthalate film with the laminated surface printed. LDPE: Low density polyethylene layer for extrusion coating. Al: aluminum foil. LLDPE-1: A two-layer coextruded film mainly composed of a linear low-density polyethylene layer, which is composed of a blend of an ethylene-vinyl acetate copolymer having a thickness of 5 μm on the heat-sealing surface and polybutene-1. The blend ratio of polybutene-1 in the blend layer is 25% by weight. LLDPE-2: A film similar to LLDPE-1, except that the part to be the base of the joint sticker is preliminarily scored in parallel with the longitudinal direction of the film at intervals of 1.5 mm. The score had a width of 0.5 mm and a depth of about 25 μm. LLDPE-3: Single layer film of linear low density polyethylene. PA-1: A biaxially stretched nylon 6 film that has been scored similarly to LLDPE-2. The width of the score is 0.5m
m and the depth was about 13 μm. UOPP: A uniaxially stretched polypropylene film that has been printed on the laminate surface by rolling. PA-2: A biaxially stretched film which is composed of a blend of nylon 6 and aromatic nylon, and is stretched preferentially in the longitudinal direction of the film to exhibit linear tearability in this direction. PP / PS: A cast film consisting of a blend of polypropylene and polystyrene that exhibits linear tearability in the longitudinal direction of the film. In this film, the PS phase was dispersed in the form of fibrils in the cross section parallel to the tearing direction, and the PP phase and PS phase formed a sea-island structure in the cross section perpendicular to the film.

Example 1 On the surface of the outer layer film of the laminate 1 having an easy peeling property, a disc-shaped grindstone was used to attach a band having a width of 5 mm consisting of a plurality of scratches in the longitudinal direction of the film, and one solid soap was applied thereto. A pillow packaging pouch with gussets was created as the contents. At this time, the band of the scar was located at the valley fold portion of the joint of the palm. In addition, the piling was performed at the center of the pouch, and the width W of the unsealed portion provided at the base was adjusted to 0.5 mm. The edge seal portion of the pouch and the end of the pouch sticking were held by hand, and the pouch was opened by pulling it in the direction in which the pouch sticking was caused. Further, the unsealing strength and the heat sealing strength were measured by the methods described below.

Example 2 Under the same conditions as in Example 1, a pouch was prepared by providing a band of scars at the root of the facing joint, which is not the valley fold portion of the facing joint, but on the opposite side. Example 1 of pouch sticking of pouch
I pulled it in the opposite direction and opened it. Further, the opening strength and the heat sealing strength were measured in the same manner.

Example 3 Under the same conditions as in Example 1, a pouch was prepared in which scar bands were provided both on the side facing the valley fold of the joint of the palm-sealed joint. This pouch was attached to the palm of the palm in the same direction as in Example 1 and in the opposite direction to open the pouch. Further, the opening strength and the heat sealing strength were measured in the same manner.

Comparative Examples 1, 2 and 3 Example 1 was carried out by using the laminate 3 which does not show the easy peeling property.
-A pouch was prepared under the same conditions as in 2.3, and the same evaluation was performed.

Comparative Example 4 A laminate 1 having an easy peeling property was used, but a pouch was prepared under the same conditions as in Example 1 without providing a weakened portion at the base of the palm joint, and the same evaluation was performed.

Table 2 shows the evaluation results of Examples 1, 2 and 3 and Comparative Examples 1 to 4. Table 2 also shows the results of Examples described later.

[Table 2] Note 1) The unsealing strength is an average value, and was evaluated by excluding the value of a defective product that had a fracture mode different from the original state at the time of measurement. However, values are not shown for all defective products. Note 2) Regarding the evaluation of the openability, those that could be torn and opened almost straight along the joints were excellent, those that could be opened but not torn straight were good, and the defective rate was 20% or less. Those that were present were rated as acceptable, and those whose defective rate exceeded 20% were designated as unacceptable.

In Examples 1, 2, and 3, the contents could be easily opened into the form shown in FIG. 6 without being disturbed by the contents. Moreover, since the opening is large, the contents can be easily taken out. The unsealing strength was about 30% of that of Comparative Example 4 in which no scratch band was provided, and the heat sealing strength was about 300 g / 15 mm width. On the other hand, in Comparative Examples 1, 2, and 3, the heat seal strength was about 4 kg /
Since the height was as high as 15 mm, defects such as breakage and delamination occurred at unintended portions of the pouch substrate shown in FIG. The defective rate was 60 to 100%. Also,
In Comparative Example 4, the opening strength was as high as about 3 kgf, and it was difficult to start opening.

Examples 4 and 5 Using the laminates 2 and 3, the effect when scores were formed on a part of the layers of the laminate was examined. A wrapping pouch with gussets similar to that of Example 1 was prepared by setting the scores of the laminates 2 and 4 so as to be located in the vicinity of the valley folds of the joints of the joints, and using one piece of solid soap as the content. These pouches were opened in the same direction as in Example 1 in the direction in which the palm sticking was caused. Further, the opening strength and the heat sealing strength were measured in the same manner.

In Examples 4 and 5, it was possible to easily open the form shown in FIG. 6 without the opening operation being hindered by the contents. Moreover, since the opening is large, the contents can be easily taken out. From these evaluation results, it was found that the weakened portion can also be formed by a score provided on a part of the laminated body. The opening of the bag was started with the score closest to the valley fold line on the joint.

Example 6 Using the laminated body 1, a pillow packaging pouch with gussets similar to that of Example 1 was prepared with one bar of soap as the content. At this time, for the edge seal, a heat seal head having a plurality of minute projections on the surface corresponding to the portion to be the opening start position of the joint of the palm is attached. As a result, a large number of scratches were formed on the surface of the pouch base material facing the valley fold portion of the plywood sticker, centering on the base of the plywood sticker.
The pouch-shaped pouch was pulled in the direction opposite to that of Example 1 to open the pouch. Further, the opening strength and the heat sealing strength were measured in the same manner.

In Example 6, it was possible to easily open the form shown in FIG. 6 without the opening operation being hindered by the contents. Moreover, since the opening is large, the contents can be easily taken out. From this evaluation result, it was found that the weakened portion can be formed by devising the heat seal head, and the weakened portion only needs to be provided at least in the vicinity of the opening start portion.

Example 7/8/9 The laminated bodies 1/5/7 were used, and two wafers were used as the contents. As in Example 1, weakened portions due to a plurality of scratches were formed in the valley folds of the joints of the joints. A pillow packaging pouch having the above-mentioned structure was prepared. In addition, the ply joint is placed in the center of the pouch, and the width W of the unsealed portion provided at the base is 0.5.
mm. Further, the second weakened portion was formed by the I notch near the end portion in the longitudinal direction of the edge seal portion. The edge seal portion of this pouch and the end portion of the parchment sticking were held by hand, and the pouch was opened by pulling in the same direction as in Example 1 in the direction in which the pouch sticking was caused. Further, the opening strength and the heat sealing strength were measured in the same manner.

Embodiments 10/11/12 Using the laminates 1/4/6, the second weakened portion was formed in the bent portion at the end of the pouch by a plurality of scratches, and the remaining conditions were those of Embodiments 7/8/9. A pouch was prepared under the same conditions as above, and the same evaluation was performed.

Example 13 A printed 30-μm-thick biaxially stretched polypropylene film was coated with a release varnish on the printed surface, and a water-based cold seal material was part-coated on the other surface on which heat sealing was planned. The pressure-sensitive pouch base material was prepared. Using this base material, a pouch was prepared under the same conditions as in Examples 7, 8 and 9, and the same evaluation was performed.

In Examples 7 to 13, the base material was torn by the second weakened portion as a trigger without damaging the contents, and could be easily opened into the form shown in FIG. 7.
Since the opening is large, it was easy to take out the contents.
In particular, a linear tearability was imparted in the longitudinal direction of the jointed palm,
In the pouches of Examples 8, 9, 11, and 12, the base material was torn straight in parallel with the joint bonding with the second weakened portion as a starting point, and the opening appearance was excellent.

The measurement in Table 2 was performed as follows. [Measurement method of unsealing strength] As shown in FIG. 10, the edge seal part 2 to be gripped by hand at the time of unsealing is fixed to the jig 21, and the edge 7 of the palm sticker 1 to be gripped is also sandwiched. To 2
A piece of tape 22 is parallel to the longitudinal direction of the joint sticking, and
It was attached so that it protruded sufficiently long from the edge. The unsealed notch for opening and the unsealed portion of the joint-sealed joint were not covered with the tape 22. Then, the end of the tape 22 was pulled in a direction of tearing the base of the joint-bonding using a tensile tester at a speed of 300 mm / min, and the maximum strength at the start of opening was evaluated as the opening strength.

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

[0088]

EFFECTS OF THE INVENTION According to the present invention, since the end portion and the edge seal portion of the joint-sealed stick are gripped and the pouch surface to which the joint-sealed stick is attached is opened by tearing and peeling, the unsealing can be performed depending on the contents. Even if the contents are not disturbed and the contents are easily broken or deformed, the contents can be opened without damaging the contents. Moreover, since the size of the pouch can be adjusted to fit the contents, the amount of the base material used can be minimized. Moreover, since the opening can be made large, it is easy to take out the contents. Furthermore, by providing a weakening line for imparting a tearing directionality or using an easily tearable resin layer, the unsealing can be surely performed.

[Brief description of drawings]

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

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

FIG. 3 is a perspective view illustrating a pillow packaging pouch according to the related art in which scratches are formed on all the seal edge portions.

FIG. 4 is a view showing an example of a pillow packaging pouch according to the related art in which a rough surface for opening is provided on a bent portion on the side surface of the pouch to enable lateral tearing, and (a) is the entire normal pouch and a line A.
It is a perspective view of the -A cross section, (b) is a perspective view of the whole pleated pouch and a line BB cross section.

FIG. 5 is a view exemplifying an opening start portion of the easy-open pouch of the present invention, in which (a) is a perspective view, and (b) and (c).
And (d) are cross-sectional views illustrating several examples in which a weakened portion is provided due to a scar.

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

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

FIG. 8 is a perspective view illustrating an embodiment in which a second notch or weakened portion is provided in the edge seal portion, (a) showing a normal pouch and (b) showing a pleated pouch.

FIG. 9 is a perspective view exemplifying a pillow packaging pouch in which a hole for displaying is provided in an edge seal portion to which the present invention is applied.

FIG. 10 is an explanatory diagram of a method for measuring the opening strength.

FIG. 11 is a cross-sectional view of a heat-sealing edge on the outside of the edge-sealing portion, and an explanatory view showing, step by step, how the constituent members of the pouch are broken by opening.

FIG. 12 is a view exemplifying the unsealing failure observed when the edge seal portion is not a peelable seal.

[Explanation of symbols]

 1 Gambling paste 2 Both-ends edge seal part 3 Notch 4 Scratch 5 Rough surface for opening 6 Contents 7 Crossing part between pegging sticker and edge seal part 8 Base of pegging sticker 9 Weakened part 9a Second weakened part 10 Peelable seal Part 11 Gasoline bonding formation base material 13 Gasoline bonding seal part 14 Unsealed part 15 Folded back part 16 hole

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[Procedure amendment]

[Submission date] October 17, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction contents]

In order to achieve the intended purpose of the present invention of facilitating the start of opening, in the vicinity of the base of the joint pad,
A weakened portion 9 due to a scar, a score, a notch, or the like is provided on at least one of the wall portions of the joint-bonding forming device . As shown in FIG. 5 (b), be provided on the valley fold side, as shown in (c) of FIG. 5, may be provided on the opposite side, as shown in (d) of FIG. 5, both vessels When it is provided on the wall , there is no restriction on the opening direction, and tearing in the opposite direction of FIG. 11 is also possible. When the weakened portion is provided on only one side of the wall of the palm-sealing paste forming device , it is preferable to indicate the opening direction.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0058

[Correction method] Change

[Correction contents]

The range where the scars or scores are provided is a pouch forming device for the pouch edge seal portion in the vicinity of the base of the piling stick .
It is provided on at least one of the walls ((b) and (c) of FIG. 5). In particular, since the linear weakened portion is formed in the valley-folded portion as described above, it is effective to provide it as shown in FIG. 5B. When it is provided on both vessel walls ((d) of FIG. 5), there is no restriction on the opening direction, and opening in the opposite direction of FIG. 11 is possible. Of course, there is no problem even if the scratches or scores extend beyond the pouch edge seal portion and reach the portion to be torn. That is, it can be linearly provided in the vicinity of the base of the joint sticker in parallel with the longitudinal direction of the joint sticker so as to have a certain width by a plurality of scratches or scores.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0061

[Correction method] Change

[Correction contents]

When the notch is provided as the weakening portion for opening the opening, at least one notch is provided on only one of the walls of the joint-bonding forming device in proximity to the base of the intersection of the joint-bonding and the edge seal portion. The distance D from the base of the palm-stick attachment to the tip of the notch is the shortest, and is preferably within 2 mm, particularly within 1 mm.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0063

[Correction method] Change

[Correction contents]

In order to provide the notch only on one side of the wall for forming the chiropractor paste, prior to heat-sealing the chiropractor paste,
It is advisable to carve a notch in the wall in advance.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0066

[Correction method] Change

[Correction contents]

The form of the pouch of the present invention is not limited to the one described above, and can be applied to any form as long as the above-mentioned requirements are satisfied. That is, as shown in FIG. 9 , the present invention is preferably applied to a pouch in a form used for packaging a film with a lens or the like. In the pouch shown in FIG.
A weakened portion due to a scratch is provided at least at a portion of the root of the base of the opening to be the opening starting portion, and a second weakened portion 9a due to a notch is formed at the end of the display locking hole 16 formed in the one edge seal portion 2. , 9a are provided. When the second weakened portion is a notch as shown in this figure, the notch may be inclined in the desired tear direction to facilitate the tearing. Further, even when the second weakened portion is a scar or a score, it is possible to give directionality, and a similar method is preferably adopted.

[Procedure correction 6]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

[Procedure amendment 7]

[Document name to be amended] Drawing

[Correction target item name] Figure 9

[Correction method] Change

[Correction contents]

[Figure 9]

Claims (7)

[Claims] 1. A pillow packaging pouch having a palm-sealing sticker and both-ends edge seal portions, and a weakened portion provided at a crossing portion between the palm-sealing sticker and the end-edge seal portion or along the root of the palm-sealing sticker at the end-edge seal portion. , A peelable seal part provided on at least a part of at least one edge seal part from the edge seal part in the joint sticking root, a gripping part composed of the joint sticking, and a pouch device wall tearing plan along the joint sticking An easy-open pouch that consists of a part and can be opened along the sticking of the palm. 2. The joint sticking comprises a wide seal portion and an unsealed portion provided at a small distance from the root of the joint sticker to the seal portion, and a portion to be torn is provided in the unsealed portion. The easily openable pouch according to claim 1, which is formed. 3. A second weakening portion provided at the edge seal portion at a constant distance from the base of the joint-stick, and a plan to tear a second pouch wall extending from the second weakening portion. The easily-openable pouch according to claim 1 or 2, wherein a portion is formed. 4. The weakened line provided in at least one layer of the pouch wall constituent material, wherein the planned tearing portion is formed.
An easily openable pouch according to any one of 1. 5. The easily tearable pouch according to any one of claims 1 to 3, wherein the tearable portion is formed of an easily tearable resin layer provided on at least one layer of the pouch wall constituent material. . 6. The easily-openable pouch according to claim 5, wherein the easily tearable resin layer is a resin film layer stretched preferentially in a tearing direction. 7. The easily tearable resin layer is formed of a blend of a plurality of resins forming a sea-island structure in a cross section perpendicular to the tearing direction and having a dispersed phase extending in the tearing direction. Easy-to-open pouch of.