JPH0977090A - Easy opening pouch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance opening properties in a pillow packing pouch having a butt-seamed part and both end edge seal parts, by providing an unsealed parts between the butt-seamed root parts and the butt-seamed sealed part and providing notches to the butt-seamed root parts of the intersecting parts of the butt-seamed sealed part and the end edge seal parts. SOLUTION: A pillow packing pouch has a butt-seamed part 1 and both end edge sealed parts 2, 2 and, in the butt-seamed part 1, unsealed parts 8 are provided between butt-seamed root parts 9 and a butt-seamed sealed part 7 and notches 11 are provided to the root parts of the intersecting parts 10 of the butt-seamed part 1 and the end edge seal parts 2. The butt-seamed part 1 is set to a grasping part and the pouch wall along the unsealed parts 8 are set to a tear scheduled part to make the pouch openable. That is, the butt- seamed part 1 and the end edge seal parts 2 are held by a fingertip and, when the butt-seamed part 1 is pulled so as to be torn, tearing is started from the notches 11 provided in the vicinity of the root parts 9 to easily open the pouch.

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 (fold) as shown in Fig. 4- (b) is preferably used. Not only will the points become noticeable, but it will be difficult to start the opening itself, and even if it is possible, 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 joint and both end edge seal portions, a seal portion provided for the joint palm stick, a base of the joint palm sticker and a joint palm sticker seal portion are provided. An unsealed portion provided at a small interval between, a notch or a weakened portion provided in proximity to the root of the cross-sealing sticking portion of the cross-sealing portion and the edge-sealing portion, and a grip portion formed by the cross-sealing stick, Provided is an easy-open pouch that comprises a pouch device wall to be torn along the unsealed portion of the palm-sealed portion and can be opened along the joint-sealed portion.
In the present invention, the planned tearing portion of the pouch device wall is formed by setting the tearing start strength to be smaller than the tearing start strength of the pouch device wall on the opposite side of the parchment sticking at least at the opening start portion. .

[0014]

As shown in FIG. 5, the pillow packaging pouch of the present invention has a palm-sealing sticker 1 and both end edge seal portions 2 and 2. An unsealed portion 8 having a small space W is provided between the seal bonding portion 9 and the seal-sealing sticker portion 7, and a notch 11 is provided in the vicinity of the base 9 of the intersection portion 10 between the seal-sealing sticker 1 and the edge seal portion 2 to fix the seal-sealing sticker portion. 1 is a gripping portion, and the pouch device wall along the unsealed portion 8 which is pasted with the palm of the hand is used as a portion to be torn, which enables the unsealing along the pasted palm of the hand.

The notch 11 is provided in the perspective view (b) of FIG. 5, but as shown in the sectional view (c) of FIG. The weakened portions 11, 11 may be provided in the portion close to the attachment root.

[0016] When the palm-sealing sticker 1 and the edge seal portion 2 near the base thereof are held with fingertips and pulled so as to tear the palm-sealing sticker, a notch or a weakened portion 11 provided in the vicinity of the base root 10 causes tearing. Be started. In the pouch of the present invention, the unsealed portion 8 is provided between the base 9 of the palm-sealed sticker and the seal-sealed sticker portion 7, so that the tearing surely progresses to the unsealed portion 8 of the palm-sealed sticker 1 and becomes two. As shown in FIG. 6 and FIG. 7, the pouch wall is torn apart along the unsealed portion 8 with the seal attached.

Gassho sticking is sealed up to the base,
When there is no unsealed portion between the base of the palm-sealed joint and the seal portion, the tearing proceeds in the heat-sealed portion of the joint-sealed joint, and smooth opening cannot be expected. On the other hand, in the present invention, since the tear started from the notch or the weakened portion 11 always enters the vessel wall of the unsealed portion of the joint-sealed joint, the tear-opening along the joint-sealed root can be performed. .

According to the present invention, therefore, 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 disturbed by the content and the content is It is easy to open and take out the contents without damaging the items.

In the case of FIG. 6, the pouch wall is torn such that one of the tearing edges is along the unsealed portion where the palm is attached, while in the case of FIG. 7, the pouch wall is torn. Both tearing edges are made so as to follow the unsealed part of the joint.

FIG. 11 is a cross-sectional view of the edge seal portion, and is a diagram showing a stepwise manner in which the pouch member is broken by opening. I shows the state after the edge sealing. In the pillow packaging pouch, the palm-sealed sticker 1 is heat-sealed, and then the palm-sealed sticker is bent to heat-seal the edge portions 2 and 2. At this time, both ends of the edge-sealed portion and the unsealed portion which is sticker-sealed are also heat-sealed. . II The figure shows the state where the paw sticker 1 is raised because the paw sticker 1 is torn. At this time, if a force is applied in the direction of the arrow, stress concentrates near the point P, which is a valley fold of the joint 9 of the joint. In the vicinity of point IIIP, one member of the joint-attached pad 1 breaks, and the stress acts on the region X of the other member and the region Y of the edge seal portion forming member facing these regions.

In order to achieve the intended purpose of surely tearing the vicinity of the joint of the joint, the breaking strength Tx in the region X and the breaking strength Ty in the region Y are expressed by the following formula (1) Tx <Ty ... …… (1) must be in the relationship. That is, by forming a weakened portion 11 due to a scar (notch) or a score or the like in at least the region X (see FIG. 5C), the vicinity of the base of the joint sticking is surely torn (FIG. 11).
IV-1) is possible.

On the contrary, when the relationship between them is expressed by the equation (2) Tx> Ty (2), the destruction mode shown by IV-2 in FIG. 11 is obtained, and finally, as shown in FIG. Opening failure occurs.

Further, when the relationship between the two is the equation (3) Tx = Ty (3), it is unlikely that the IV-1 in FIG. 11 is in the unsealed state. The unsealed state shown or the delamination of the pouch constituent member becomes the destruction mode as shown in IV-3 of FIG. 11.

In order to achieve the object of the present invention of facilitating the unsealing, it is preferable to provide a weakened portion in the region X and also a weakened portion due to a scar or a score near the point P. In particular, when it is difficult to start tearing such as when the laminated body forming the wall of the pouch is thick, it is extremely effective to provide the weakened portion near the point P. At this time, 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 only in the area X, it is preferable to display the opening direction.)

In order to achieve the object of the present invention that the tearing surely proceeds to the unsealed portion of the palm-sealed portion, it is necessary to provide an unsealed portion between the base of the palm-sealed portion and the seal-sealed portion. In particular, when tearing is started by the notch, the distance D between the tip end and the root of the joint sticker needs to be smaller than the width W of the unsealed portion, as shown in FIG. 5B.

Further, in order to surely advance the tear to the unsealed portion of the joint sticker, and at the same time, to advance the tear straight along the joint sticker, in order to achieve the object of the present invention, in the vicinity of the base of the joint sticker. A method of providing a weakening line or providing an easily tearable resin layer is adopted.

[0027]

Preferred Embodiment of the Invention

[Pouch Wall] In the present invention, the pouch wall may be a single layer, but generally a laminate is preferably used. As the flexible material forming the wall of the pouch, an olefin resin for imparting heat sealability, a stretched plastic film for imparting mechanical strength and heat resistance, a gas barrier property for imparting oxygen, etc. Multiple combinations of metal foil, gas barrier resin, vapor deposition film, etc.
Used in the form of 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 copolymer: 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.
0.01 d / g or more measured at 30 ° C. in the mixed solvent of 5,
Particularly, it is desirable to have a viscosity of 0.05 d / g or more.

Other examples of the gas barrier resin having the above-mentioned properties include 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 the liter) 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.

[Tear-to-be-Teared] Various means can be used to impart tearability to the to-be-teared portion 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 the diameter (Dn) in the thickness direction of the film is generally 0.05 to 20 μm, particularly 0.1 to 10 μm in a cross section perpendicular to the tearing direction. 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 on the gassho sticker 1 together with the seal portion 7 and the root 9 of the gassho sticker and the gassho sticker seal portion 7. Then, the unsealed portion 8 is provided. The widthwise dimension of the palm-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 about 5 to 50% of the width of the palm-sealing. Good to be in range. When the opening of the opening is triggered by the weakened portion due to the plurality of scratches, the width W of the unsealed portion can be set small.

[Notch for Starting Opening and Weakened Portion] In the present invention, a notch or a weakened portion is provided in the vicinity of the base of the intersection of the gas-sealed sticker 1 and the edge seal portion 2. The notch can be formed by carving. The position where the notch is formed is a position close to the base, but as shown in FIG.
It is preferable that the distance D from the base of the joint-attachment to the tip of the notch and the width W of the unsealed portion provided at the base satisfy the relationship of the formula (4) D <W ... (4).

The notch is generally put at the same time in two parts forming the joint sticking, but it is on one side (see FIG. 11).
It may be provided only in the region X) shown in -III. The notch may have any length as long as the opening can be smoothly started. For example, the notch may be provided only in the unsealed portion of the edge of the pouch, but it is preferable to extend to the heat sealed portion.

The notch shapes are I notch, U notch, and V notch.
Notches or other shapes of notches may be provided, and the notches may be provided only on the unsealed portion of the pouch edge, and
You may provide so that it may reach the edge part of a heat seal.

When heat-sealing the edge seal portion of the pouch, the heat-sealing is performed in a state where the joint-sealing stick is bent. A scar or a score is provided to form a weakened portion. The valley-folded portion at which the opening is started has a linear weakened portion formed by bending and pressure during heat sealing. If a plurality of scratches or scores are provided in this portion as well, the formation of the weakened portion due to bending and pressing at the time of heat sealing becomes more effective. There is also an advantage that there is no restriction on the opening direction.

The shape and size of the scar or score are not particularly limited as long as easy tearability 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 that which does not penetrate through the film layer or the like, or may penetrate through these, and is appropriately selected in relation to tearability, airtightness and the like. Furthermore, the density of scars or scores is
The average distance between adjacent scars or scores is within 3 mm,
It is particularly preferably within 2 mm.

The range where the scratches or scores are provided is provided at least in the area X shown in FIG. 11-III of the pouch edge seal portion in the vicinity of the joint of the joint. Desirably region X
And near the point P which is the valley fold. 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 preferably provided on a substrate that is difficult to stretch and easily cut.

Any method known per se may be used as a method for cutting the scratches or scores, for example, processing with a grindstone in the shape of a disk or roll, or a disk or roll having a plurality of protrusions or cutting edges formed on its surface. Machining with a tool, scratch-like machining with a speed difference between the tool and the substrate, etc. are adopted. In addition, laser processing, electric discharge processing, ultrasonic processing, etc. are adopted.

[Production of pillow packaging pouch] In the pillow packaging pouch of the present invention, the edges of the laminate for forming the wall of the pouch are overlapped and heat-sealed to form a seal-sealed seal portion, thereby forming an unsealed portion. It is manufactured by bending the gas-sealed paste in the state of containing, and heat-sealing the both edges in the state of containing the content, cutting and notching if necessary. The scratches or scores 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 easily taken out by changing the position of the sticking of the palm. For example, when two contents are put in parallel to the longitudinal direction of the pouch as shown in FIG. 6, it is easy to take out if the pouch is provided near the center of the pouch. Further, as shown in FIG. 7, when the content is one and has the same size as the pouch, the content can be taken out easily by shifting the position of the joint sticking from the center as much as possible.

When it is desired to unseal only a specific part of the seal-sealed portion, the width W of the unsealed part is narrowed while the unsealed part is widened and the unsealed part is widened depending on the shape of the heat-sealing tool. It is possible to set it at a specific position for sticking the palm.

The pouch form of the present invention is not limited to the one described above, but can be applied to any one as long as the above-mentioned conditions are satisfied. That is, as shown in FIG. 12, the present invention is preferably applied to a pouch having a hole for display lock used for packaging such as a film with a lens. In the pouch shown in FIG. 12, a weakened portion due to a scar is provided at least at a portion 9 which is an opening start portion of the base of the joint-attached palm 1.

[0058]

The present invention will be further described in the following examples.

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

[0060]

[Table 1] Note 1) / symbol in the table indicates the adhesion surface by sandwich lamination, and the adhesion surface of PET and Al was coated with urethane-based anchor agent as needed. The symbol indicates the adhesive surface that has been 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: Linear low density polyethylene film. LLDPE-2: A linear low-density polyethylene film that has been scored in parallel with the longitudinal direction of the film in the vicinity of the base portion of the plywood sticker at intervals of 1.5 mm. In addition,
The score had a width of 0.5 mm and a depth of about 25 μm. 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. PE / PS: An extruded resin layer made of a blend of polyethylene and polystyrene for extrusion coating and showing linear tearability in the longitudinal direction of the film. In this layer, the PS phase was dispersed in the form of fibrils in the cross section parallel to the tearing direction, and the PP phase and the PS phase formed a sea-island structure in the cross section at right angles.

Examples 1 and 2 Using the laminate 1 shown in Table 1, a pillow packaging pouch was prepared with two wafers as contents. At this time, the parchment was placed at the center of the pouch, and the width W of the unsealed portion provided at the base was adjusted to 2 mm. Further, a notch for opening was provided in the vicinity of the base of the intersection of the joint-attachment and the edge seal portion, and the distance D from the joint-attachment base to the tip of the notch was adjusted to 0.5 mm and 1 mm. The opening strength of these pouches and the opening performance when actually opened by hand were evaluated. Table 2 shows the results.

Examples 3 to 8 Pillow wrapping pouches were prepared using the laminates 2 to 7 in Table 1 under the same conditions as in Examples 1 and 2 with two wafers as contents. At this time, the width W of the unsealed portion provided at the base of the palm-sealed joint was adjusted to 2 mm, and the distance D from the base of the palm-sealed joint to the tip of the notch was adjusted to 1 mm. The opening strength of these pouches and the opening performance when actually opened by hand were evaluated. Table 2 shows the results.

Comparative Examples 1-2 As a comparison with Examples 1-2, those notched were used,
The same evaluation was performed for the case where the distance D was 3 mm.
Table 2 shows the results.

[0064]

[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, the average value of the defective products is shown in parentheses for all the defective products. Note 2) Regarding the evaluation of the openability, it was excellent that those that could be torn and opened almost straight along the joints were excellent, those that could be opened but could not be torn straight (see Fig. 6) were good, 20% Those with the following defective rates (see FIG. 7) were acceptable, and those with a defective rate exceeding 20% were not acceptable. Note 3) The classification of defective opening is shown below. Defect 1: Defect as shown in FIG. 11-IV-2 (FIG. 8) in which the tear is transferred to the edge seal portion instead of the joint-attached portion. Defect 2: Delamination of the laminate due to tearing Defect as shown in Fig. 11-IV-3. Poor 3: Tear could not be opened because the tear was performed only in the heat-sealed portion of the seal, or the tear escaped to the outside of the seal.

As shown in Table 2, in Examples 1 and 2, there was no defect, and the opening strength showed a value close to 10% of that of Comparative Example 1 in which the notch was not formed, and the contents were not damaged. , Could be opened easily. Also, the contents could be easily taken out. However, depending on the individual sample, most were not torn straight along the joint.

The pouches of Examples 3 to 8 having a linear tearing property in the longitudinal direction of the puffing joint had low unsealing strength, and the tearing could be opened almost straight along the puffing joint. Further, in these samples, the width W of the unsealed portion and the distance D from the base of the joint sticking to the tip of the notch are adjusted to be the same as those of the sample of Example 2, but the sample of Example 2 is intended to start at tearing. When the direction of the force was changed, the tear rarely escaped to the outside of the seal and could not be opened. However, in the samples of Examples 3 to 8, such a phenomenon was not observed and the opening was surely performed.

In Comparative Example 1 in which the notch was not formed, not only the unsealing strength showed a high value of about 3 kgf, but all unsealing was defective. Although a notch was formed, in Comparative Example 2 in which the position of the tip of the notch was inadequate, the effect of the notch was observed in terms of opening strength, but when it was opened by hand, most of the tears were stuck together. It escaped from the heat-sealed part to the outside and could not be opened.

Next, using the laminate 1, scratches were formed on the film surface at the bases of the joints along the joints, and the difference depending on the position of the joints was examined.

Example 9 · 10 A belt-shaped streak having a width of 5 mm consisting of a plurality of scratches was attached to the surface of the outer layer film of the laminated body 1 in the longitudinal direction of the film by using a disc-shaped grindstone, and one solid soap was contained in the content. A pillow packaging pouch with gussets was created as a product. The positions of the scratches were provided at the portions shown in FIGS. 9-c and 5-c.
In addition, the position of the base of the pouch is shifted from the center of the pouch to the end so that the contents can be taken out easily after opening. The width W of the unsealed portion provided at the base of the palm-stick was adjusted to about 0.5 mm. The opening strength of these pouches and the opening performance when actually opened by hand were evaluated in the same manner as in Example 1.

Comparative Examples 3 to 7 As a comparison of Examples 9 and 10, scratches are shown in FIGS. 9-b, d, e.
Pouches provided in the portions indicated by f and g were prepared and evaluated in the same manner.

The evaluation results of Examples 9 and 10 and Comparative Examples 3 to 7 are shown in Table 3.

[0072]

[Table 3]

As shown in Table 3, in Examples 9 and 10, there was no defect, and the opening strength was about 30% of that of Comparative Example 1 in which the notch was not formed, and the contents were not damaged. , Could be opened easily. Moreover, since the position of the base of the pouch is offset from the center of the pouch, the opening can be located at the end of the pouch, so that the contents could be easily taken out. Further, the pouch of Example 10 was torn in the opposite direction, but it could be easily opened and there was no restriction on the opening direction. In Comparative Examples 3 to 7, the unsealing failure rate was as high as 40 to 100%. In these tests, the conditions under which the scratches were made were the same, but in Comparative Examples 6 and 7 the depth and shape of the scratches were changed and adjusted so that the formula (1) in the specification was satisfied. By doing so, it is possible to reduce the defective rate.

Next, using the laminates 2 and 3, the effect when scores were formed on a part of the layers of the laminate was examined.

Examples 11 to 14 The laminates 2 and 3 were positioned so that the scores were located in the vicinity of the base of the joint, and one bar of soap was used as the content, and the same gusset as in Examples 9 and 10 was attached. I made a pillow packaging pouch. The position of the score is shown in Figure 9-
c and the portion shown in FIG. 5-c. The opening strength of these pouches and the opening performance when actually opened by hand were evaluated in the same manner as in Example 1. Example 11
The evaluation results of Nos. 14 to 14 are shown in Table 4.

[0076]

[Table 4]

As shown in Table 4, Examples 11-14
There was no defect, and the unsealing strength was about 30 to 40% of that of Comparative Example 1 in which the notch was not provided, and the unsealing could be easily performed without damaging the contents. Moreover, since the position of the base of the pouch is offset from the center of the pouch, the opening can be located at the end of the pouch, so that the contents could be easily taken out. Examples 11-14
It was found from the evaluation result of 1. that the weakened portion can be formed also by the score provided on the constituent member of the laminate.

[Measurement Method of Opening Strength] As shown in FIG. 10, the jig 21 is provided with the edge seal portion 2 to be gripped by hand during opening.
The two tapes 22 were attached in parallel to the longitudinal direction of the palm-sealing paste so as to sandwich the edge 9 of the palm-sealing tape 1 which is also gripped, and so as to protrude 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. And
The end of the tape 22 is 300 mm using a tensile tester
At the speed of / min, pull the base of the joint sticker in the direction to tear and start opening

[0079]

According to the present invention, since the end portion and the edge seal portion of the joint-sealed stick are grasped and the tear is opened only within the pouch surface to which the joint-sealed stick is attached, the opening is not hindered by the contents. Moreover, even if 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. Further, by providing a weakening line for imparting tearing directionality or using an easily tearable resin layer, opening and closing of the opening can be surely performed. Was evaluated as the maximum strength.

[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 diagram showing two examples of pillow packaging pouches 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 FIG. It is a perspective view of the line AA cross section, and (b) is a perspective view of the whole pleated pouch and the line BB cross section.

FIG. 5 is a view illustrating an easy-open pouch of the present invention,
(A) is an overall view, (b) is an enlarged perspective view of a main part B, and (c) is a cross-sectional view of the main part B taken along line C-C.

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

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

FIG. 8 is a perspective view illustrating an unsealing failure observed when a notch or a weakened portion is not provided at the unsealing start position.

FIG. 9 is a cross-sectional view of a heat-sealing edge outside the edge-sealing portion, which is a diagram for explaining a scratching position provided to form a weakened portion in the example and the comparative example.

FIG. 10 is a perspective view for explaining 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, illustrating in stages how the constituent members of the pouch are destroyed by opening.

FIG. 12 is a perspective view exemplifying a pillow packaging pouch having a hole for display lock in an edge seal portion to which the present invention is applied.

[Explanation of symbols]

 1 Gambling paste 2 Both-edge sealing part 3 Notch 4 Scratch 5 Rough surface for opening 6 Contents 7 Gumping sticking seal part 8 Gumping unsealed part 9 Gimbal sticking root 10 Gimbal sticking and edge seal part root 11 Notch or weakened part 12 Planned tearing part

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[Procedure amendment]

[Submission date] October 12, 1995

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

[0014]

As shown in FIG. 5, the pillow packaging pouch of the present invention has a palm-sealing sticker 1 and both end edge seal portions 2 and 2. An unsealed portion 8 having a small space W is provided between the seal bonding portion 9 and the seal-sealing sticker portion 7, and a notch 11 is provided in the vicinity of the base 9 of the intersection portion 10 between the seal-sealing sticker 1 and the edge seal portion 2 to fix the seal-sealing sticker portion. 1 is a gripping portion, and the pouch wall along the unsealed portion 8 which is attached to the palm is used as a planned portion to be torn, which enables the opening along the joint.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0078

[Correction method] Change

[Correction contents]

[Measurement Method of Opening Strength] As shown in FIG. 10, the jig 21 is provided with the edge seal portion 2 to be gripped by hand during opening.
The two tapes 22 were attached so as to sandwich the end edge 9 of the palm-sealing sticker 1 which is also gripped and held in parallel with the longitudinal direction of the palm-sealing stick, and to protrude sufficiently long from the end edge. The unsealed notch for opening and the unsealed portion of the joint-sealed joint were not covered with the tape 22. And
The end of the tape 22 is 300 mm using a tensile tester
It was pulled in the direction of tearing the base of the joint-sealed joint at a speed of / min, and the maximum strength at the start of opening was evaluated as the opening strength.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0079

[Correction method] Change

[Correction contents]

[0079]

According to the present invention, since the end portion and the edge seal portion of the joint-sealed stick are grasped and the tear is opened only within the pouch surface to which the joint-sealed stick is attached, the opening is not hindered by the contents. Moreover, even if 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 tearing directionality or using an easily tearable resin layer, the opening and closing of the opening can be surely performed.

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

[Procedure Amendment 5]

[Document name to be amended] Drawing

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

[Figure 5]

Claims (6)

[Claims] 1. A pillow packaging pouch having a palm-sealing sticker and both-end-edge seal portions, wherein a seal portion provided for the palm-sealing sticker and a small gap provided between the base of the joint-sealing stick and the seal-sealing sticker portion. A seal part, a notch or a weakened part provided in the vicinity of the root of the cross-sealing sticking part of the cross-sealing sticking part and the edge seal part, a grip part formed by the cross-sealing sticking part, and a pouch along the unsealed part of the cross-sealing part An easy-open pouch that consists of the part to be torn on the container wall and can be opened along the sticking of the palm. 2. The strength of the torn part of the wall of the pouch is
The easy-open pouch according to claim 1, wherein the pouch is set to have a strength smaller than that of the wall of the pouch on the opposite side of the parchment at least at the opening start portion. 3. The easily-openable pouch according to claim 1, wherein the planned tearing portion is a weakening line provided on at least one layer of the pouch wall constituent material. 4. The easily tearable pouch according to claim 1, wherein the tearable portion is formed of an easily tearable resin layer provided on at least one layer of the pouch wall constituent material. 5. The easily openable pouch according to claim 4, wherein the easily tearable resin layer is a resin film layer stretched preferentially in a tearing direction. 6. 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.