JPH10194299A - Bag made of plastic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily form a discharging port wherein a content is prevented from leaking to the outside by a method wherein a heat-sealed part is formed at the peripheral end parts of a front wall and a rear wall which are superposed in such a manner that the drawing directions by which they are drawn in the uniaxial direction, are diagonally crossed each other, and at the upper corner part, a specified notched part is formed. SOLUTION: At a heat-sealed part 3 on the peripheral edge end part at an upper corner part of a bag body A, notched parts 4, 4 which engage with the mouth part of a container for refilling, are formed, and in addition, at one location in the notched parts 4, 4, a notch 5 for unsealing is engraves diagonally toward the opening in the same direction as either one (x) of the drawing directions of a front wall 1 and a rear wall 2. For this packaged product, a discharging port can be easily formed at the upper corner part of the bag body in such a manner that both sides of the notch 5 for unsealing are held by hands, and the bag body is diagonally torn toward the upper end sealed part with the notch 5 part for unsealing as an unsealing start point by adjusting to the drawing direction which is drawn in the uniaxial direction (x) of the front wall 1 or the rear wall 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic bag, and more particularly, to a plastic bag which can be easily opened in a diagonal direction at an upper corner portion and a spout can be formed very easily. It is about bags.

[0002]

2. Description of the Related Art Various forms of plastic bags suitable for filling and packaging liquid or semi-fluid articles such as industrial products such as foods and drinks, detergents, pharmaceuticals, and others have been developed and proposed. Have been. As one of them, in recent years, plastic bags for refilling have been proposed in order to recycle containers for saving resources. This one is
At the time of refilling, a spout for taking out the contents can be easily formed, and at the time of transferring the contents, the contents do not spill from the spout.
It is desired that other containers can be easily and easily refilled. For that, for example,
A concave portion or notch is provided on at least one side of the upper portion, and a relief portion communicating with the inside which is not sealed by the seal within the seal width at the time of sealed bag making is provided immediately above the concave portion or notch. A plastic bag with a refillable spout has been proposed, characterized in that the escape portion is formed as a spout by removing an upper portion of the concave portion or the cutout portion after the sealing and bag making. Jpn.
No. (Japanese Utility Model Laid-Open No. 5-81042), JP-A-7-300146, Utility Model Registration No. 3006
944).

[0003]

However, in the plastic bag with the refillable spout as described above, there are various problems in forming the spout for pouring out the contents for refilling. For example, in a plastic bag as described above, a recess or notch is formed in a narrow seal at the peripheral end of the bag, and an opening notch is further formed in the recess or notch. Or
Although a groove-shaped portion or an engagement protrusion is provided at the mouth of the container to be transferred, the plastic bag is formed even if the opening notch is torn in the hand as an opening starting point and is torn. Tough resin film, etc.
The opening is not easy, and it is difficult to form a spout in a predetermined manner even if the bag is simply torn with the hand. Usually, instead of holding the bag in your hand and tearing it,
It is the actual state that the upper corner is cut to form a spout using scissors or the like. Therefore, the opening means of scissors or the like is not always accessible at all times. In forming the spout, it is inevitable to feel troublesome and inconvenient. Even if the plastic bag for refilling is torn with the bag in hand, the tearing direction is not constant, and sometimes it is difficult to bend and open to form a spout having a desired shape. If the operation of refilling the contents into another container is performed, there is a problem that the contents overflow to the outside, which is not preferable.
Accordingly, an object of the present invention is to provide a refillable plastic bag that can easily form a predetermined spout that does not overflow the contents during refilling.

[0004]

As a result of various studies to solve the above-mentioned problems, the present inventors have noticed that a uniaxially stretched resin film has tearability in the stretching direction. Preparing a front wall and a rear wall including a resin film stretched in at least one axial direction, and intersecting the front wall and the rear wall obliquely with each other in the stretching direction stretched in the uniaxial direction within 90 degrees. Then, a heat seal portion is formed at the peripheral end of the front wall and the rear wall to form a bag, and the peripheral end of the upper corner portion of the bag is formed. A notch is formed in the heat seal portion to engage with the mouth of the refill container, and one of the front wall and the rear wall extends at one position of the notch. The opening notch is cut diagonally toward the opening in the same direction as the plastic A bag is manufactured, and the plastic bag is filled with the contents from the opening, and then the opening is heat-sealed to form an upper end sealing portion. When refilling the product, hold both sides of the opening notch in hand and tear it diagonally from the opening notch to the upper end seal part with the opening notch as the opening start point. A plastic bag for refilling in which the spout can be easily formed and the contents can be easily and easily transferred through the spout without spilling the contents into another container. To complete the present invention.

[0005] That is, the present invention provides a front wall and a rear wall including at least a uniaxially stretched resin film.
Further, the front wall and the rear wall are overlapped with each other so as to obliquely intersect with each other within a stretching direction extending in one axis direction of 90 degrees or less, and then a heat sink is provided at a peripheral end of the front wall and the rear wall. A notch for engaging a mouth portion of a refill container at a heat seal portion at a peripheral edge of an upper corner portion of the bag member by forming a seal portion and forming a bag body. The present invention relates to a plastic bag characterized in that a spout can be formed by forming an opening and tearing the end of the cutout toward the upper opening.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below. First, the configuration of the plastic bag according to the present invention will be described with reference to the drawings by exemplifying a specific example. FIGS. 1 and 2 are schematic diagrams showing an example of the configuration of the plastic bag according to the present invention. FIG. 3 is a schematic plan view showing a configuration of a packaged product in which contents are packed in the plastic bag shown in FIGS. 1 and 2, and FIG. 4 is a packaged product shown in FIG. 3. It is a schematic perspective view which shows the structure of the state in which the spout was formed.

First, in the present invention, as a plastic bag according to the present invention, as shown in FIG. 1, a front wall 1 and a rear wall 2 including a resin film stretched in at least one axial direction x are prepared. Next, as shown in FIG. 2, the front wall 1 and the rear wall 2 are obliquely intersected with each other so that the stretching direction extending in the uniaxial direction x is within 90 degrees, that is, not orthogonal. Overlap, then the front wall 1
A heat seal is formed at the peripheral edge of the rear wall 2 to form heat seal portions 3, 3, 3 to form a bag, and a top corner portion of the bag is formed. Heat seal part 3 at peripheral edge P
The notches 4, 4 engaging with the mouth of the refill container.
Further, an opening notch 5 is formed in one of the cutouts 4 and 4 in the same direction as the extending direction x of one of the front wall 1 and the rear wall 2. In this case, the plastic bag A according to the present invention is manufactured by being engraved diagonally toward.

In the present invention, the plastic bag exemplified above is an example, and the present invention is not limited thereto. For example, although not shown in the present invention, the plastic bag As the form of the bag, it is possible to take various forms, for example,
Various forms such as a self-supporting bag (standing pouch), a casette-type bag, a boat bottom-type bag, and the like can be adopted. In the above description, the opening notch engraved at one location in the cutout portion is, for example, in the present invention, a resin film that is uniaxially stretched is used as a material for forming the front wall, the rear wall, and the like. Therefore, when simply tearing in the direction of the opening by holding the end of the notch in the hand, the upper corner of the bag is easily torn using the stretching direction of the resin film. If the spout can be easily formed, it is not always necessary to provide the spout.

Next, in the present invention, a packaged product in which contents are packed in a plastic bag according to the present invention as described above will be described. As shown in FIG. 3, as shown in FIG. 1 and FIG. The contents 6 are filled from the opening of the plastic bag A, and then the opening is heat-sealed to form the upper end seal portion 7, and the packaging using the plastic bag A according to the present invention is performed. Product B can be manufactured. In FIG. 3, 1, 2, 3, 4, 5, P and the like have the same meaning as described above. Thus, in the present invention, as shown in FIG. 4, the packaged product B is provided with the opening notch 5 held by the both sides of the opening notch 5 toward the upper end seal portion 7 as shown in FIG. The portion 5 is used as an opening starting point, and is torn in an oblique direction in accordance with the stretching direction extending in the uniaxial direction x of the front wall 1 or the rear wall 2, and is spouted at the upper corner of the bag body. 8 can be formed easily, and the contents 6 can be easily and easily transferred through the spout 8 without spilling the contents 6 to another container (not shown). It is. In the above description, when the contents 6 are refilled into another container, the cutout portion 4 can engage with the mouth of the other container.

Next, in the present invention, the material constituting the plastic bag according to the present invention will be described. First, in the present invention, the uniaxially stretched resin film is usually formed of a plastic bag. Because it is a basic material that constitutes, it has excellent properties in mechanical, physical, chemical, other, etc., especially resin film that is strong and tough, and has heat resistance Alternatively, a sheet can be used. Specifically, for example, polyester resin, polyamide resin, polyaramid resin, polyolefin resin such as polyethylene or polypropylene, polystyrene resin, polyacryl or methacryl resin, polycarbonate resin, polyacetal Resin, fluorine resin,
Films or sheets of tough resin such as polyacrylonitrile resin, polyvinyl alcohol resin, etc.
And others can be used. Thus, as the resin film or sheet, a stretched film stretched in either the longitudinal direction or the transverse direction can be used, and further, a biaxial film in the longitudinal direction and the transverse direction can be used. A stretched film stretched in the direction can also be used. As the stretching method, for example, a known method such as a flat method or an inflation method can be used, and a stretching ratio of about 2 to 10 times can be used. Further, the thickness of the film is about 5 μm to 100 μm, preferably about 10 μm to 50 μm. In the present invention, the resin film as described above, for example, characters, figures, symbols, patterns,
A desired printed picture such as a pattern may be subjected to front printing or back printing by a normal printing method.

In the present invention, the plastic bag according to the present invention can be produced by using a single layer of a resin film stretched in at least one direction as described above. In the above, the resin film stretched in the uniaxial or biaxial direction, the other material is arbitrarily laminated to form a front wall and a rear wall, etc., using these, the plastic bag according to the present invention It is preferred to produce Thus, as the other material to be laminated on the resin film stretched in the uniaxial direction, a resin film or sheet constituting a normal flexible packaging bag can be used, and specifically, For example, low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-ethyl acrylate copolymer , Ethylene-acrylic acid or methacrylic acid copolymer, methylpentene polymer, polybutene resin, polyvinyl chloride resin, polyvinyl acetate resin, polyvinylidene chloride resin, vinyl chloride-vinylidene chloride copolymer, poly ( (Meth) acrylic resin, polyacrylonitrile resin, polystyrene resin, acrylo Tolyl-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), polyester resin, polyamide resin, polycarbonate resin, polyvinyl alcohol resin, ethylene Arbitrarily selected from known resin films or sheets such as saponified vinyl acetate copolymer, fluorine resin, diene resin, polyacetal resin, polyurethane resin, nitrocellulose, etc. Can be used. In addition, for example, a film such as cellophane, synthetic paper, or the like can be used. In the present invention, the above-mentioned film or sheet can be used in any of unstretched and uniaxially or biaxially stretched. The thickness is arbitrary, but is from several μm to 300 μm.
It can be used by selecting from a range of positions. Further, in the present invention, the film or sheet may be any film such as an extruded film, an inflation film, or a coating film.

In the present invention, when manufacturing the plastic bag according to the present invention using the front wall, the rear wall, and the like, the innermost layers are overlapped or opposed to each other to form a heat sink.
Since the seal portion is formed by sealing to form a bag, in the present invention, the innermost layer constituting the front wall, the rear wall and the like is a heat-sealing resin film or the like. See
It is desirable to use The heat-sealing resin film may be any film that can be melted by heat and fused together, for example, low-density polyethylene, medium-density polyethylene, high-density polyethylene, and wire. Low-density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer Polymer, ethylene-propylene copolymer, methylpentene polymer, polybutene polymer, polyolefin resin such as polyethylene or polypropylene acrylic acid, methacrylic acid,
Resins such as acid-modified polyolefin resin modified with unsaturated carboxylic acid such as maleic acid, fumaric acid, maleic anhydride, polyvinyl acetate resin, poly (meth) acrylic resin, polyvinyl chloride resin and others Film or sheet can be used. Thus, the above-mentioned film or sheet can be used in a state of a coating film of a composition containing the resin. The thickness of the film or film or sheet is 5 μm to 3 μm.
It is desirably about 00 μm, preferably about 10 μm to 100 μm. By the way, in the present invention, the resin film having the heat sealing property as described above can be provided also on the outermost layer constituting the front wall, the rear wall, and the like.
The plastic bag according to the present invention may be manufactured by superposing the innermost layer surface and the outermost layer surface on each other and heat sealing the end of the overlapped surface to form a seal portion. it can.

Furthermore, in the present invention, the above-described
As a film of the resin having a sealing property, a film or sheet of an ethylene-α-olefin copolymer polymerized by using a metallocene catalyst can be used in the same manner. Specifically, as a film or sheet of an ethylene-α-olefin copolymer polymerized using a metallocene catalyst, for example, a metallocene complex such as a catalyst formed by a combination of zirconocene dichloride and methylalumoxane and alumoxane A catalyst or catalyst of the combination, that is, a film or sheet of an ethylene-α-olefin copolymer obtained by polymerization using a metallocene catalyst can be used. The metallocene catalyst has a non-uniform active site and is called a multi-site catalyst, whereas the existing catalyst is called a single-site catalyst because the active site is uniform. For example, Mitsubishi Chemical Corporation's product name "Kernel", Mitsui Petrochemical Industry Co., Ltd. product name "Evolu", USA, Exxon Chemical (EXX)
"EXACT" (trade name, manufactured by ON CHEMICAL), Dow Chemical, USA
"Affinity- (AF)
FINITY), brand name "ENGAGE (ENGAG)
E) ethylene-polymerized using a metallocene catalyst such as
An α-olefin copolymer film can be used. Thus, in the present invention, the ethylene-α.
The olefin copolymer film can be used in the form of a coating film or the like made of a composition containing the resin. The thickness of the film or film is 5
It is preferably about μm to 300 μm, preferably about 10 μm to 100 μm. In the present invention, when a film or sheet of an ethylene-α-olefin copolymer polymerized using a metallocene catalyst is used as the heat-sealing resin film as described above,
This has the advantage that low-temperature heat sealability is possible when manufacturing a bag.

Further, in the present invention, when manufacturing a laminated material for forming the front wall, the rear wall, etc., a barrier material is further added.
It is also possible to use a substrate having a property. Thus, as a substrate having such a barrier property, a property of blocking light such as sunlight, or a property of not transmitting water vapor, water, gas, and the like can be used. Can be used, which may be a single base material or a composite base material obtained by combining two or more types of base materials. Specifically, for example, a resin film having an aluminum foil having a light-shielding property and a barrier property or a vapor-deposited film thereof, a silicon oxide film having a barrier property, a resin film having a vapor-deposited film of an inorganic oxide such as aluminum oxide. , Water vapor, water barrier
Low-density polyethylene, medium-density polyethylene,
Films or sheets of high-density polyethylene, linear low-density polyethylene, polypropylene, ethylene-propylene copolymer, etc., polyvinylidene chloride having a gas barrier property, polyvinyl alcohol, ethylene-vinyl acetate copolymer Resin film or sheet such as saponified product
A colorant such as a pigment or the like may be added to the resin, and other desired additives may be added and kneaded to form a film, and various light-shielding colored resin films or sheets may be used. These materials can be used alone or in combination of two or more. The thickness of the above-mentioned film or sheet is arbitrary, but is usually preferably about 5 μm to 300 μm, more preferably about 10 μm to 100 μm. Further, in the above, the aluminum foil has a thickness of about 5 μm to 30 μm,
As a deposited film of aluminum or an inorganic oxide, a film having a thickness of about 100 to 2000 mm can be used. Examples of the resin film supporting the above-mentioned vapor-deposited film include a polyester film, a polyamide film, a polyolefin film, a polyvinyl chloride film, a polycarbonate film, a polyvinylidene chloride film, a polyvinyl alcohol film, and an ethylene-acetic acid film. Saponified vinyl copolymer films and the like can be used.

Further, in the above, as the inorganic oxide constituting the above-mentioned deposited film of the inorganic oxide, for example, silicon oxide (SiO _x ), aluminum oxide, indium oxide, tin oxide, zirconium oxide or the like is used. can do. Furthermore, in the present invention, the inorganic oxide may be a mixture of silicon monoxide and silicon dioxide, or a mixture of silicon oxide and aluminum oxide. In the present invention, as a method of forming the inorganic oxide thin film layer, the thin film layer is formed by forming a vapor deposition film by a vacuum vapor deposition method such as an ion beam method or an electron beam method, or a sputtering method. be able to. In the above description, the thickness of the inorganic oxide thin film layer is usually preferably about 10 nm to 200 nm in order to obtain a sufficient barrier property.
About 150 nm is desirable. In the above, when the thickness of the inorganic oxide thin film layer exceeds 150 nm, in particular, 200
If the thickness exceeds nm, cracks and the like are likely to be formed in the inorganic oxide thin film layer, and there is a risk that the barrier property may be reduced due to the warp, and the material cost may be increased.

Next, in the above-mentioned present invention, a method for producing a laminated material constituting the front wall, the rear wall and the like according to the present invention using the above-mentioned materials will be described. Lamination methods used when manufacturing ordinary packaging materials, for example, wet lamination method, dry lamination method, solventless dry lamination method, extrusion lamination method, T die co-extrusion molding method , Co-extrusion lamination method, inflation
It can be carried out by a method such as a method of application and others. Thus, in the present invention, when performing the above lamination, if necessary, a pretreatment such as a corona treatment or an ozone treatment can be applied to the film. (Urethane-based), polyethyleneimine-based, polybutadiene-based, organotitanium-based anchor coating agents, or polyurethane-based, polyacryl-based, polyester-based, epoxy-based, polyvinyl acetate-based, cellulose-based, etc. Known anchor coating agents, adhesives, and the like, such as the adhesive for laminating, can be used.

By the way, in the above-described method for producing a laminated material, the extruded resin constituting the adhesive resin layer at the time of extruding and laminating is, for example, polyethylene,
Ethylene-α-olefin copolymer, polypropylene,
Copolymers of ethylene and unsaturated carboxylic acids such as polybutene, polyisobutene, polyisobutylene, polybutadiene, polyisoprene, ethylene-methacrylic acid copolymer, or ethylene-acrylic acid copolymer, or acid-modified polyolefins obtained by modifying them A series resin, an ethylene-ethyl acrylate copolymer, an ionomer resin, an ethylene-vinyl acetate copolymer, and the like can be used. Further, in the present invention, as the adhesive constituting the adhesive layer at the time of dry lamination, specifically,
Two-component curable urethane adhesives, polyester urethane adhesives, polyether urethane adhesives, acrylic adhesives, polyester adhesives, polyamide adhesives, polyvinyl acetate adhesives used in dry laminates, etc. An adhesive, an epoxy-based adhesive, a rubber-based adhesive, and the like can be used.

Next, in the present invention, a method for producing the plastic bag according to the present invention will be described. There are various methods, such as the aforementioned front wall,
Using a laminated material constituting the rear wall and the like, the heat-sealing resin film surfaces are superposed facing each other, and the peripheral edge is heat-sealed to form a seal portion. And the plastic bag according to the present invention can be manufactured. In the above, as the form of heat sealing the peripheral end, for example, side seal type, two-way seal type, three-way seal type, four-way seal type, envelope-attached seal type Heat seals such as gasoline-sealed seal type (pyro-seale type), pleated seal type, flat bottom seal type, square bottom seal type, boat bottom seal type, etc. And various forms of plastic bags suitable for this can be manufactured. Others, for example, self-supporting packaging bags (standing pouches)
And the like can also be manufactured, and in this case, the above-described laminated material constituting the front wall, the rear wall, and the like can be similarly used as the material constituting the bottom wall. In the above, the method of heat sealing includes, for example, a bar seal, a rotary roll, and the like.
It can be carried out by a known method such as a seal, a belt seal, an impulse seal, a high frequency seal, an ultrasonic seal and the like.

Next, in the present invention, a bag constituting the plastic bag according to the present invention is manufactured as described above,
A notch is formed in a heat seal portion at a peripheral end of an upper corner portion of the bag body so as to engage with a mouth portion of the refill container. A method of engraving an opening notch in an oblique direction toward the opening will be described. As such a method, for example, as shown in the plan view of FIG. 5, the front wall 1 and the rear wall 2 are overlapped. When manufacturing bags in a continuous manner, heat seals are placed vertically and horizontally around the periphery.
To form the bag portions 21, 21
The heat seal portions 20 ', 20' at the upper corners of the vertical heat seal portions 20, 20 are formed to have a large seal width, and As shown by an arrow M, heat seal portions 20 ', 20' at the upper corners.
Are formed with a cutter or the like in a portion of the notch 22 to be engaged with the mouth portion of the refill container. Further, the bag is provided in one of the notches 22, 22. Body 21, 2
Towards the opening portions 23, 23, similarly, using a cutter or the like, to match the stretching direction of one of the uniaxially stretched resin films constituting the front wall or the rear wall, It can be formed by a method of engraving the oblique opening notches 24, 24, or the like. In the above, the bags 21 are separated by the center dotted line 25,
A plastic bag according to the present invention is manufactured. In the above description, the opening notch is not necessarily provided as described above, and in the case where the notch is provided, the spout is formed using the film stretching direction of the uniaxially stretched resin. Therefore, there is an advantage that it can be formed more reliably and easily.

In the present invention, the plastic bag according to the present invention produced as described above can be used for various purposes. For example, liquid products such as foods and drinks, industrial products such as detergents, pharmaceuticals, etc. Or it can be used as a plastic bag suitable for filling and packaging semi-fluid articles, especially in recent years, as a plastic bag for refilling, to recycle containers for resource saving. Can be done. Further, the plastic bag according to the present invention is also useful as a retort packaging bag for filling and packaging various foods and drinks.

[0021]

The present invention will be described more specifically with reference to the following examples. Example 1 A two-component curable polyurethane-based adhesive was applied to one side of a 15-μm-thick biaxially stretched nylon film (manufactured by Unitika Ltd., trade name: ONMG) at 3 g / m ² (dry), and then applied. Dry laminating an aluminum foil having a thickness of 7 μm on the surface, and then applying 2 g of a two-component curable polyurethane-based adhesive to the surface of the aluminum foil in the same manner as described above.
² (dry) and then apply a thickness of 100
A low-density polyethylene film having a thickness of μm (trade name, AV-51, manufactured by Tamapoly Co., Ltd.) was dry-laminated to produce a laminated material constituting a front wall, a rear wall, and a bottom wall. Next, using the laminated material manufactured above, first, the vertical 19c
m, a laminated material constituting a front wall and a rear wall of 12 cm in width, two laminated materials constituting a bottom wall of 7 cm in length and 12 cm in width, 1
The sheets were adjusted. Next, the laminated material constituting the front wall and the rear wall adjusted as described above, and two sheets of the laminated material are stretched in the biaxial directions so that the front wall and the rear wall intersect at approximately 30 degrees,
In addition, the low-density polyethylene film surfaces are overlapped so that they face each other, and between them, the laminated material constituting the bottom wall is interposed by being folded into an inverted V-shape so that the low-density polyethylene film surface becomes the surface. Then, the laminated material forming the front wall and the rear wall and the laminated material forming the bottom wall are heat-sealed at the side portions and the bottom portion at the peripheral ends thereof. Forming a notch in the wide heat seal portion at the upper corner, using a cutter to engage with the mouth of the refill container, A notch for opening was formed in the notch obliquely toward the opening to produce a self-supporting bag. A refill detergent was filled from the opening of the self-supporting bag manufactured as described above, and then the opening was heat-sealed to produce a packaged product. About the above packaged product, when refilling, tear open the notch for opening,
The spout was formed very easily and easily, and the refilling operation could be completed without spilling the contents.

Example 2 A two-part curable polyurethane-based adhesive was applied to one side of a 15-μm-thick biaxially stretched nylon film (manufactured by Unitika Ltd., trade name: ONMG) at 3 g / m ² (dry). A 50 μm-thick non-stretched polypropylene film (trade name, Aroma-R, manufactured by Showa Denko KK)
T2) was dry-laminated to produce a laminated material. Next, using the laminated material manufactured above, first, the vertical 22c
m, a laminated material having a width of 10 cm was prepared. Then, using two sheets of the laminated material adjusted as described above, the stretching direction in the biaxial direction is made to intersect at approximately 20 degrees between the front wall and the rear wall, and the unstretched polypropylene film faces each other. Then, the two laminated materials were heat-sealed at their peripheral edges at three sides to produce a flat pouch. Next, a notch is formed in the wide heat seal portion at the upper corner of the flat pouch manufactured as described above, using a cutter to engage with the mouth of the refill container. Then, a notch for opening was formed in the notch obliquely toward the opening to produce a plastic bag.
A refill detergent was filled from the opening of the plastic bag produced above, and then the opening was heat-sealed to produce a packaged product. When the above-mentioned packaged product is refilled and the opening notch is torn in hand, the spout is formed extremely easily and easily, and the refilling operation is completed without spilling the contents. I was able to.

Example 3 The above-mentioned Example 1 was performed using a laminated material having the following layer structure.
A self-supporting bag was produced in the same manner as described above, and the same effect was obtained as a plastic bag for refilling detergent.
12 μm thick biaxially oriented polyethylene terephthalate film / adhesive layer / aluminum foil 7 μm thick / adhesive layer / biaxially oriented nylon film 15 μm thick / adhesive layer / low density polyethylene film 80 μm thick

[0024]

As is apparent from the above description, the present invention focuses on the fact that a uniaxially stretched resin film has tearability in the stretching direction, and at least a uniaxially stretched resin film is used. A front wall and a rear wall are prepared, and the front wall and the rear wall are overlapped with each other by obliquely crossing each other within 90 degrees in the direction of extension in the uniaxial direction. A heat seal portion is formed at the peripheral end with the wall to form a bag, and the heat seal portion at the peripheral end of the upper corner of the bag is filled with a refill container. A notch for engaging with the opening of the opening is formed, and a notch for opening is formed at one position of the notch in the same direction as the extending direction of one of the front wall and the rear wall. Engraved diagonally toward the opening to produce a plastic bag,
The plastic bag is filled with the contents from the opening, and then the opening is heat-sealed to form the upper end seal. Thus, when the contents are refilled, it is opened. Hold the both sides of the notch in hand and tear it diagonally from the opening notch toward the upper end seal part with the opening notch as the starting point of opening to easily form a spout at the upper corner of the bag. It is possible to manufacture a refillable plastic bag that can be easily and easily transferred without spilling the contents into another container through the spout. Things.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an example of the configuration of a plastic bag according to the present invention.

FIG. 2 is a schematic plan view showing an example of the configuration of a plastic bag according to the present invention.

FIG. 3 is a schematic plan view showing a configuration of a packaged product in which contents are packed in the plastic bag shown in FIGS. 1 and 2;

FIG. 4 is a schematic perspective view showing the configuration of the packaged product shown in FIG. 3 in an open state.

FIG. 5 is a schematic plan view showing a state in which a notch and an opening notch are cut in the plastic bag according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Front wall 2 Rear wall 3 Heat seal part 4 Notch part 5 Opening notch 6 Contents 7 Upper end seal part 8 Spout opening 20 Heat seal part 20 'Heat seal part 21 bags Body 22 Notch part 23 Opening part 24 Opening notch 25 Center dotted line A Plastic bag B Packaging product M Arrow P Heat seal part 3 at the peripheral edge of the upper corner of the bag body x Uniaxial direction

Claims (4)

[Claims] 1. A front wall and a rear wall including a resin film stretched in at least one axial direction, and the front wall and the rear wall are mutually moved within a stretching direction of 90 degrees within the uniaxial stretching direction. The bag is constructed by forming a heat seal portion at the peripheral edge of the front wall and the rear wall to form a bag body, and forming the upper corner portion of the bag body. A cutout portion is formed in the heat seal portion at the peripheral end to engage with the mouth of the refill container, and the end of the cutout portion is torn toward the upper opening to hold the spout. A plastic bag which can be formed. 2. The plastic bag according to claim 1, wherein an opening notch is formed at one position in the cutout portion, the opening notch being obliquely directed toward the opening. 3. The plastic bag according to claim 2, wherein the extending direction of one of the front wall and the rear wall and the oblique direction of the opening notch are the same. 4. The self-supporting bag according to claim 1, wherein an inverted V-shaped bottom wall is interposed at a lower end between the front wall and the rear wall. 3. The plastic bag described in 3.