JP2001079991A - Laminating material and packaging container using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To incorporate excellent low temperature heat sealability, low temperature hot sealing and high speed filling packaging suitability and to provide no liquid-leakage of a content by sequentially laminating a base material film, a barrier layer, a pressure resistant strength layer and a heat sealable resin layer. SOLUTION: As the laminating material A, at least a base material film 1, a barrier layer 2, a pressure resistant strength layer 3 and a heat sealable resin layer 4 are fundamentally sequentially laminated, and laminating auxiliary material layers are provided between the respective layers as needed. In the case of forming lateral sealing parts corresponding to an upper side and a bottom side of the doubled laminating material A by a pair of rolls for lateral sealing, at least occurrence of a resin reservoir or the like is not recognized. Then, thinning of a thickness of the sealed part is not recognized as well. Excellent low temperature sealability, low temperature hot sealability or the like, high speed filling packaging suitability are incorporated. Further, excellent biting heat sealablility or the like through a content or the like, sufficient sealing strength are incorporated. No liquid leakage of a content and excellent storage stability are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated material and a packaging container made from the laminated material, and more particularly, to a laminated material having excellent low-temperature heat sealability and suitable for high-speed filling packaging. Furthermore, it has excellent strength and the like, and has bag-breaking resistance, and also has excellent preservability of its contents without impairing the flavor, taste, etc., and in particular, liquid seasonings, soups, etc. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated material useful for filling and packaging a liquid food or beverage to produce a liquid pouch packaged product, and a packaging container formed by using the laminated material.

[0002]

2. Description of the Related Art Conventionally, sauces, soy sauce, dressings, ramen soup, noodle juice, ketchup, tabasco, wasabi,
To fill and package liquid mustard, other liquid seasonings, soups, other liquid foods and beverages, etc., use materials such as plastic film, paper base, aluminum foil, Sayahan, non-woven fabric, etc. Arbitrarily laminated according to the contents to be filled and packed, filling and packaging conditions, etc.,
Laminated materials of various forms and packaging containers made by using them have been developed and proposed. The most representative of the above laminated materials and packaging containers is a laminated material comprising at least three layers: a base film, a barrier layer, and a heat-sealing resin layer. Further, a packaging container formed by using the same is known. In recent years, in these laminated materials, packaging containers, etc., in order to make unit packaging (individual packaging) suitable for the amount used,
This is made into a small bag form, and the contents are filled and packaged to produce a liquid small bag packaged product.For example, each use of each bag is used one by one to avoid unnecessary use of the contents, etc. In addition, since it has simplicity of use and convenience such as disposal of packaging containers after use, the demand is expected to be greatly expanded.

[0003]

By the way, in the above-mentioned laminated material, packaging container and the like, for individual packaging, it is formed into a small bag, and the contents are filled and packaged to produce a liquid small bag packaged product. The, for example, that the excellent preservability of the contents so as not to impair the taste, flavor, etc., or that the contents have high-speed filling and packaging suitability for filling and packaging the contents, distribution and sales of packaged products, It is necessary to satisfy various conditions such as that the packaging container does not break during storage and the like. However, conventional laminated materials, packaging containers and the like lack low-temperature heat-sealing properties and low-temperature hot-sealing properties, and it is extremely difficult to fill and package the contents at high speed. And the productivity is poor. In addition, the above small bag form,
When filling and packaging the contents, for example, a three-way seal
When filling and packaging using a wrapping machine or the like, the contents to be filled and packaged adhere to the seal surface, and it is necessary to bite through the contents and perform heat sealing and the like. Therefore, if the heat seal is carried out through the contents or the like as described above, the heat seal or the like cannot be sufficiently performed, and the heat seal cannot be performed. This may cause a seal failure or the like in the part, causing problems such as leakage of the contents. Therefore, the present invention is excellent in low-temperature heat sealability, low-temperature hot seal and the like, and has high suitability for high-speed filling and packaging, and is further excellent in bite heat sealability via contents and the like. It is an object of the present invention to provide a laminated material having sufficient seal strength and useful for producing a packaging container or the like without leakage of contents, and a packaging container formed by using the laminated material. .

[0004]

The inventor of the present invention has conducted various studies to solve the above-mentioned problems, and as a result, first, the above-mentioned laminated material was used, and the heat-sealing resin layer was used. When the heat-sealing portion is heated and pressurized and heat-sealed, the heat-sealed portion is heat-sealed.
The heat-sealable resin constituting the heat-sealable resin layer is extruded in the flow direction by heating and pressurization and flows to form the heat-sealable resin layer corresponding to the heat-seal portion. However, even if the heat-sealing resin becomes thin and thin, the portion corresponding to the heat-sealing portion is heat-sealed to form a sealing portion. The present inventors have found out that it is extremely difficult to form a seal portion having a sufficient seal strength, and have paid attention to this phenomenon. Thus, based on the above-mentioned attention, the present inventor has made at least three of the base film, the barrier layer, and the heat-sealing resin layer.
In a laminated material having a plurality of layers, a pressure-resistant strength layer made of a heat-meltable resin or the like is provided between the barrier layer and the heat-sealing resin layer to produce a laminated material. use,
When the surface of the heat-sealing resin layer was opposed and the contents were filled and packaged, the outer peripheral edge was heat-sealed to produce a packaged product. Excellent in heat-sealing properties, low-temperature hot-sealing properties, etc., and suitable for high-speed filling and packaging.Furthermore, it has excellent heat-sealing properties through contents etc., and has sufficient sealing strength, There is no leakage of the contents, etc., and furthermore, the preservability of the contents is excellent without impairing the flavor, taste, etc., and especially, the liquid seasoning, soup, etc. The present invention has been completed by finding a laminate which is extremely useful for producing a liquid pouch packaged product and a packaging container using the same.

That is, the present invention provides at least a substrate film, a barrier layer, a pressure-resistant strength layer, and a heat-sealing layer.
TECHNICAL FIELD The present invention relates to a laminated material characterized by sequentially laminating thermoplastic resin layers, and a packaging container formed by using the laminated material.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The above-mentioned present invention will be described below in more detail with reference to the drawings and the like. First, an example of a laminated material according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view illustrating an example of a layer configuration of the laminated material according to the present invention. FIG. 3 is a schematic perspective view showing an example of the configuration of a packaging container according to the present invention formed by using the laminated material shown in FIG. 1 and FIG. It is a schematic perspective view which shows the structure of an example about the packaged product which fills and packs the content in the packaging container concerning this invention, FIG. FIG. 5 is a schematic configuration diagram illustrating an example of a filling and packaging apparatus for filling and packaging a liquid food or beverage in the form of a small bag, and FIG. 5 shows a portion of a seal portion in the filling and packaging apparatus shown in FIG. FIG. 2 is a schematic configuration diagram illustrating a partially enlarged example of

First, as a laminated material A according to the present invention,
As shown in FIG. 1, the basic structure has a structure in which at least a base film 1, a barrier layer 2, a pressure-resistant strength layer 3, and a heat-sealing resin layer 4 are sequentially laminated. In the laminated material according to the present invention, although not shown, if necessary, for example, a primer
A layer, a layer of an auxiliary coating agent such as an anchor coating agent layer, etc. can be optionally provided. Further, in the laminated material according to the present invention, although not shown, in addition to the above-described materials, its packaging purpose, contents to be filled and packed, packaging conditions, quality assurance, and the like, further, other plastic films, It goes without saying that other base materials can be arbitrarily laminated.

Next, in the present invention, the packaging container according to the present invention formed by using the laminated material according to the present invention to make a bag will be described. As shown in FIG. To exemplify an example using the laminated material A according to the present invention, the laminated material A shown in FIG. 1 is folded in two with the surface of the heat-sealing resin layer 4 opposed to each other,
Heat-sealing the edges around the outer circumference on both the bottom and outer sides
By forming the sealing portions 5 and 5 and forming the opening 6 on the upper side thereof, the packaging container B according to the present invention can be manufactured. Thus, in the present invention, as shown in FIG.
Then, the contents 7 are filled through the opening 6, and thereafter, the upper peripheral portion 8 around the outer periphery of the upper side of the opening 6 is heat-sealed to form the upper seal portion 8, thereby forming the book. A packaging product C using the packaging container B according to the invention can be manufactured. The above examples illustrate one example of the packaging container according to the present invention, and the present invention is not limited thereto. As will be described later, the packaging container according to the present invention may be, for example, a 4-way seal-type packaging container, a self-supporting packaging container, or a gusset-type packaging, in addition to the above-described three-way seal-type packaging container. Containers, others, and the like, and the form can be small bags, middle bags, large bags, etc.

Further, in the present invention, the laminated material according to the present invention is used, is packed in a small bag form for individual packaging, and is filled with a liquid food or drink such as sauce or soy sauce as the contents. To illustrate an example of a filling and packaging apparatus,
As shown in FIG. 4, first, a laminated material A according to the present invention is fed from a take-up roll 11, and the laminated material A is further passed through step rolls 12, 12,. The guide is guided to the guide roll 13 while adjusting the supply. Next, guide row
The laminated material A guided to the tool 13 is folded in half through a normal triangular plate (not shown) or the like so that the heat-sealing resin layer faces each other.
Are fed to a pair of vertical seal rolls 15, 15 through a guide frame 14 for guiding the rolls. Next, the laminated material A folded in two by the pair of vertical seal rolls 15 and 15 described above.
The outer peripheral edge of the outer side is heated and pressurized to form a side seal by side sealing to form an outer side seal portion 5. Further, the laminated material A folded in half is subjected to a pair of first horizontal seals. Rolls 16, 16
The horizontal seal portion 5 corresponding to the upper side and the lower side is formed by the pair of horizontal seal rollers 16, 16.

On the other hand, the sealing portion 5 and the lateral sealing portion 5 on the outer side are formed from the filling nozzle 17 for filling a liquid food or drink such as sauce or soy sauce disposed above. A liquid food or drink such as a source or soy sauce is continuously supplied and filled into the packaging container. As described above, the contents are filled while being continuously supplied, and at the same time, the outer side seal portion 5 and the lateral seal portion 5 are sequentially and repeatedly formed in synchronization with each other. ,
In order to obtain a stable seal strength with the pair of second horizontal seal rolls 18, 18, heat and pressure are applied once again to the above-mentioned horizontal seal portion 5, and further, After cooling, the phototube device 19 is arranged and the center line of the horizontal seal portion 5 is observed, and then the center line of the horizontal seal portion 5 is cut by the cutter devices 20 and 20. To form a bottom seal part 5 and a top seal part 8 to produce a packaged product C in the form of a three-sided sealed pouch filled with contents 7. Can be. In the present invention, although not shown, for example, a cut portion such as a V-shaped notch or an I-shaped notch may be arbitrarily provided in a seal portion or the like on the outer side to facilitate taking out the contents. it can. Also, in the above example, an example in which a packaged product in the form of a three-sided sealed pouch is manufactured, but a packaged product in the form of a four-sided sealed pouch can also be manufactured. However, it can be mass-produced in multiple rows.

In the present invention, for example, as shown in FIG.
When the horizontal seal portions 5 corresponding to the upper side and the lower side are formed by the rolls 16 for rolls, the rolls are formed of a conventional base film, barrier layer, and heat seal resin layer. Using the laminated material A, the heat-sealing resin layer faces each other, and the heat-sealed portion is heated and pressurized to perform heat-sealing. The heat-sealing resin constituting the heat-sealing resin layer is extruded in the flow direction by heating and pressurization, flows and flows into the resin pool 2.
1 and thereby the thickness L of the sealing part.
₁ indicates that the heat-sealing resin constituting the heat-sealing resin layer corresponding to the portion becomes thin, thin, thin and thin, and corresponds to the heat-sealing portion. Although it is extremely difficult to form a seal portion having a sufficient seal strength even if a seal portion is formed by heat sealing a portion [FIG. 5 (M)]. In the laminated material A according to the present invention, which includes at least the four layers of the base film, the barrier layer, the pressure-resistant strength layer, and the heat-sealing resin layer, the above-described resin pool and the like are not included. generation can not be observed, furthermore, shea - thickness L ₂ of the pole tip is also not observed phenomena such as thinner, very low heat - city - Le resistance, between the low temperature thermal sheet -
It has excellent sealing properties and suitability for high-speed filling and packaging, and also has excellent heat sealing properties through contents etc., has sufficient seal strength, leaks contents, etc. Without sacrificing flavor and taste, it is also excellent in the preservability of its contents.In particular, liquid seasonings, soups, etc. It can be manufactured [FIG. 5 (N)]. Reference numerals, 16 and the like in the figure have the same meaning as described above.

Next, in the present invention, the materials constituting the laminated material, the packaging container and the like according to the present invention, and the manufacturing method thereof will be described. First, in the present invention, the base film is a packaging container. Since it is a basic material that composes, etc., it has strength, excellent weather resistance, light resistance, heat resistance, chemical resistance, and other various robustness, mechanical, chemical,
In other respects, a resin film or sheet having tough properties can be used. Specifically, for example, polyester resins, polyamide resins, polyaramid resins, polyolefin resins such as polyethylene resins or polypropylene resins, polycarbonate resins, polystyrene resins, polyacetal resins,
A film or sheet of a tough resin such as a fluororesin or the like can be used. Thus, as the resin film or sheet, any one of an unstretched film and a stretched film stretched in a uniaxial or biaxial direction can be used.
The thickness of the film is 5 μm to 100 μm
And preferably about 10 μm to 50 μm. In the present invention, the base film as described above is subjected to, for example, front printing or back printing by printing a desired printing pattern such as a character, a figure, a symbol, a picture, or a pattern by a normal printing method. It may be.

In the present invention, as the base film according to the present invention, for example, various paper bases constituting a paper layer can be used. Is used to impart moldability, bending resistance, rigidity, etc., for example, a strongly sized bleached or unbleached paper substrate, or pure white roll paper, kraft paper, paperboard, processed paper, etc. Paper substrate, etc. can be used. In the above, the paper base constituting the paper layer has a basis weight of about 8
0 to 600 g / m ² , preferably about 10 basis weight
It is desirable to use a material of about 0 to 450 g / m ² . Of course, in the present invention, a paper base constituting the paper layer and a film or sheet of the above-mentioned various resins can be used in combination.

Next, in the present invention, as the barrier layer constituting the laminated material, the packaging container and the like according to the present invention, first, a barrier material which prevents permeation of oxygen gas, water vapor and the like is used. Can be. Examples of the barrier material that prevents permeation of the above oxygen gas and water vapor include, for example,
Aluminum foil, a deposited film of aluminum, a deposited film of an inorganic oxide such as silicon oxide or aluminum oxide, a polyvinylidene chloride resin layer, a vinyl alcohol resin layer, an ethylene-vinyl alcohol copolymer layer, a polyacrylonitrile resin layer, A polyamide-based resin layer and others can be used. Thus, in the present invention, the barrier layer as described above is provided on one surface of the base film by a vapor deposition method such as a physical vapor deposition method or a chemical vapor deposition method, or a roll coat. , Gravure roll coat, kisco-
A barrier layer is formed by a printing method such as gravure printing, offset printing, transfer printing, etc., etc., and a composite material composed of both can be used. . In the above, as the aluminum foil, a thickness of about 5 to 20 μm, a deposited film of aluminum, or a deposited film of an inorganic oxide such as silicon oxide or aluminum oxide, having a thickness of 50 to 50 μm.
The resin layer composed of a polyvinylidene chloride resin layer, a vinyl alcohol resin layer, an ethylene-vinyl alcohol copolymer layer, a polyacrylonitrile resin layer, or a polyamide resin layer having a thickness of about 2000 μm 50
The μm order is preferred.

Further, in the present invention, as the barrier layer, for example, a barrier material that blocks permeation of water vapor, water and the like can be used. For example, low density polyethylene, medium density polyethylene, high density polyethylene, A film or sheet obtained by extruding and laminating a polyolefin-based resin such as polyethylene, linear low-density polyethylene, polypropylene, and ethylene-propylene copolymer can be used. The thickness is preferably about 5 μm to 50 μm. In addition, in the present invention, as a barrier layer, various colored resin films or sheets having light-shielding properties obtained by adding a colorant such as a pigment to a resin and other desired additives and kneading to form a film. Etc. can be laminated. These materials can be used alone or in combination of two or more.

Next, in the present invention, the pressure-resistant layer constituting the laminated material, the packaging container and the like according to the present invention will be described. As the pressure-resistant layer, as described above, the shell constituting the packaging container is used. -It has the strength to maintain the film properties of the heat-sealing resin layer as well as the film properties of itself and to prevent deformation and the like of the film thickness, etc. against the heat and pressure when forming the sealing layer. Further, the base film and the heat-sealing resin layer are excellent in close-adhesiveness, function as an adhesive layer for both, and are used for opening a packaging container in the form of a small bag. It is required to have the property of being excellent in the cut property of the glass. Specifically, as the pressure-resistant strength layer, for example, a resin layer that can be fused and mutually fused by heat can be used, for example, low-density polyethylene,
Medium density polyethylene, high density polyethylene, linear (linear) 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, ethylene-propylene copolymer Modification of polyolefin-based resin such as methylpentene polymer, polybutene polymer, polyethylene or polypropylene with unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid A heat-meltable resin layer made of a resin such as a polyolefin resin, a polyvinyl acetate resin, a poly (meth) acrylic resin, a polyvinyl chloride resin, or the like can be used. In the present invention, the heat-meltable resin layer is formed, for example, by extruding one or more of the above resins into a film by using an extruder or the like.
It can be formed by using an extrusion laminating method or the like. Thus, in the present invention, among the above-mentioned resins, particularly, a hot-melt polyolefin-based resin, and further, a linear (linear) low-density polyethylene (LLDPE)
And the resulting heat-fusible resin layer is
This is desirable from the viewpoint of adhesiveness with the sealable resin layer. In the present invention, the thickness of the pressure-resistant strength layer is preferably about 5 μm to 300 μm, more preferably about 1 μm to 300 μm.
It is preferably about 0 μm to 100 μm.

Next, in the present invention, the heat-sealing resin layer constituting the laminated material, the packaging container and the like according to the present invention will be described. A resin layer that can be melted and fused to each other can be used. Specifically, for example, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) 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, ethylene-propylene copolymer, methyl pentene polymer, polybutene polymer, polyolefin resin such as polyethylene or polypropylene, acrylic acid, methacrylic acid, maleic acid,
From resins such as acid-modified polyolefin resins, polyvinyl acetate resins, poly (meth) acrylic resins, polyvinyl chloride resins, and other resins modified with unsaturated carboxylic acids such as maleic anhydride, fumaric acid, and itaconic acid A hot-melt resin layer can be used. In the present invention, the above-mentioned hot-melt resin layer is formed by, for example, an extrusion laminating method in which one or more of the above-mentioned resins are laminated while being extruded into a film by using an extruder or the like. And the like. Thus, in the present invention, among the resins described above, a heat-meltable resin layer made of a heat-meltable polyolefin resin is particularly desirable in view of the adhesiveness to the pressure-resistant strength layer and the like. . In the present invention, the thickness of the heat-sealing resin layer is preferably about 5 μm to 300 μm, more preferably
A thickness of about 10 μm to 100 μm is desirable.

In the present invention, when the above-mentioned pressure-resistant strength layer, heat-sealing resin layer and the like are extruded by a lamination method, if necessary, for example, isocyanate-based (urethane) ), Polyethyleneimine-based, polybutadiene-based, organic titanium-based anchor coating agents and the like. Thus, in the present invention, the above-mentioned anchor coating agent is, for example, roll-coated.
Coating, gravure coating, knife coating, dip coating, spray coating and other coating methods, and then drying the solvent, diluent, etc.
A coating agent layer can be formed. In the above, the thickness of the anchor coating agent layer is 0.1 to 6.0 g /
m ² (dry state) is desirable.

In the present invention, the heat-sealing resin layer is formed of, in particular, an ethylene / α-olefin copolymer polymerized using a metallocene catalyst (single-site catalyst) and a polyolefin rubber. The heat-sealing resin layer of the resin composition containing
It has excellent sealing properties and low-temperature hot sealing properties, and is suitable for high-speed filling and packaging. In addition, it has excellent heat sealing properties such as biting through contents and has sufficient sealing strength. However, it is desirable because it has the advantage that a seal portion without leakage of the contents can be formed. In a resin composition containing an ethylene / α-olefin copolymer and a polyolefin rubber polymerized using the metallocene catalyst (single-site catalyst), ethylene / polymerized using a metallocene catalyst (single-site catalyst) is used.
As the compounding ratio of the α-olefin copolymer and the polyolefin rubber, the former is about 65% to 95% by weight,
More preferably, the latter is mixed at a blending ratio of about 5% to 35% by weight, more preferably about 15% to 25% by weight with respect to about 75% to 85% by weight. . Further, in a resin composition containing an ethylene / α-olefin copolymer and a polyolefin-based rubber polymerized using the above metallocene catalyst (single-site catalyst), for example, a plasticizer, a stabilizer, an antioxidant,
One or more additives such as an ultraviolet absorber, a filler, a slip agent, an antiblocking agent (AB agent), an antistatic agent, a colorant, and the like are optionally added and kneaded to form a resin composition. Can be adjusted. Thus, in the present invention, a heat-sealing resin layer can be provided by using the resin composition as described above, for example, by extrusion lamination.

In the above, the ethylene / α-olefin copolymer polymerized by using a metallocene catalyst (single site catalyst) includes, for example, a metallocene complex such as a catalyst obtained by combining zirconocene dichloride and methylalumoxane with alumoxane. , That is, 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. Specifically, the brand name “Kernel” manufactured by Mitsubishi Chemical Corporation, the brand name “Evolu” manufactured by Mitsui Petrochemical Industry Co., Ltd., Exxon Chemical (USA)
N Chemical Co., Ltd. product name "Exact (E
XACT) ", Dow Chemical, USA
MICAL) Affinity- (AFFI)
NITY), and an ethylene / α-olefin copolymer polymerized using a metallocene catalyst such as “ENGAGE” (trade name) can be used.

The ethylene / α-olefin copolymer polymerized using the metallocene catalyst will be described in more detail. Specifically, for example, a catalyst comprising a combination of a metallocene transition metal compound and an organoaluminum compound;
That is, an ethylene / α-olefin copolymer obtained by polymerization using a metallocene catalyst (including a so-called Kaminski catalyst) can be used. The above-mentioned metallocene catalyst may be used while being supported by an inorganic substance. In the above, as the metallocene-based transition metal compound, for example, a transition metal selected from Group IVB, specifically, titanium (Ti), zirconium (Zr), hafnium (Hf), a cyclopentadienyl group, a substituted cyclo A pentadienyl group, an indenyl group, a substituted indenyl group, a tetrahydroindenyl group, a substituted tetrahydroindenyl group, a fluorenyl group or one or two substituted fluoronyl groups, or two of these groups What is cross-linked by a covalent bond is bonded, and in addition, a hydrogen atom, an oxygen atom, a halogen atom, an alkyl group, an alkoxy group, an aryl group, an acetylacetonate group, a carbonyl group, a nitrogen molecule, an oxygen molecule, A Lewis base, a substituent having a silicon atom, and a ligand having a ligand such as an unsaturated hydrocarbon can be used. . In the above, as the organic aluminum compound, alkyl aluminum,
Alternatively, a chain or cyclic aluminoxane or the like can be used. Here, as the alkyl aluminum,
For example, triethylaluminum, triisobutylaluminum, dimethylaluminum chloride, diethylaluminum chloride, methylaluminum dichloride,
Ethyl aluminum dichloride, dimethyl aluminum fluoride, diisobutyl aluminum hydride,
Diethyl aluminum hydride, ethyl aluminum sesquichloride and the like can be used. The chain or cyclic aluminoxane can be produced, for example, by bringing alkyl aluminum into contact with water. For example, it can be produced by adding alkyl aluminum at the time of polymerization and then adding water, or by reacting the water of crystallization of a complex salt or the water of adsorption of an organic / inorganic compound with the alkyl aluminum. Next, in the above, as the inorganic substance supporting the metallocene catalyst, for example, silica gel, zeolite, silicon earth, or the like can be used.

Next, in the above, as the polymerization method,
For example, it can be performed by various polymerization methods such as bulk polymerization, solution polymerization, suspension polymerization, and gas phase polymerization. Further, the above polymerization may be performed by any method such as a batch method or a continuous method. In the above, the polymerization conditions include polymerization temperature, -1
The reaction pressure is usually from about 300 kg / cm ^{2 to about} 200 kg at a temperature of 00 to 250 ° C., a polymerization time of 5 minutes to 10 hours. Furthermore, in the present invention, α is a comonomer copolymerized with ethylene.
As the olefin, for example, propylene, 1-butene, 3-methyl-1-butene, 4-methyl-1-pentene, 1-hexene, 1-octene, decene and the like can be used. The above-mentioned α-olefins may be used alone or in combination of two or more. The mixing ratio of the α-olefin is, for example, 1 to 50% by weight, preferably 10 to 30% by weight.
It is preferable to set the weight%. Thus, in the present invention, ethylene polymerized using the above metallocene catalyst
The physical properties of the α-olefin copolymer include, for example, molecular weight, 5
× 10 ^{3 to} 5 × 10 ⁶ , density, 0.890 to 0.930
g / cm ³ , melt flow rate [MFR], 0.1 to
It is around 50 g / 10 minutes. In the present invention, the ethylene-α-olefin copolymer polymerized using the metallocene catalyst includes, for example, an antioxidant, an ultraviolet absorber, an antistatic agent, an antiblocking agent, a lubricant (such as a fatty acid amide). ), Flame retardants, inorganic or organic fillers, dyes, pigments and the like can be optionally added and used.

In the above, examples of the polyolefin rubber include polyethylene rubber, polypropylene rubber, ethylene-propylene copolymer rubber, isoprene rubber, butyl rubber, butadiene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluorine rubber and the like. Rubber,
One or more kinds such as chloroprene rubber and others can be used.

In the present invention, the pressure-resistant strength layer and the heat-sealing resin layer are the same as the heat-fusible resin constituting the pressure-resistant strength layer and the heat-sealing property. It is possible to form a co-extruded resin layer by using a hot-melt resin constituting the resin layer and co-extruding them by a co-extrusion method, and to simultaneously form a pressure-resistant strength layer and a heat-sealing resin layer. it can. In the above, as a method of forming a co-extruded resin layer, it can be manufactured by a T-die co-extrusion method or the like, and the layer configuration is a co-extruded resin layer composed of two or more layers. Further, the thickness of each resin layer is formed by adjusting the thickness of each resin layer arbitrarily within the range of about 5 to 50 μm, more preferably about 10 to 30 μm. It is desirable.

Further, in the present invention, the pressure-resistant strength layer and the heat-sealing resin layer are the same as the heat-fusible resin constituting the pressure-resistant strength layer and the heat-sealing resin described above. Using a hot-melt resin constituting the layer, and using a T-die co-extrusion machine or a co-extrusion inflation machine, etc., the T-die co-extrusion method or co-extrusion inflation is used.
By co-extrusion by an application method or the like, a co-extruded resin film is formed in advance, and then, using a laminating adhesive or the like on the surface of the barrier layer or the like constituting the laminated material, By laminating dry laminating via the laminating adhesive layer, a pressure-resistant strength layer and a heat-sealing resin layer can be formed. In the above, in order to form a co-extruded resin film, as a layer constitution, a co-extruded resin film composed of two or more layers can be formed, and the thickness of the co-extruded resin film is as follows. It is desirable that the thickness of each resin film layer is arbitrarily adjusted within a range of about 5 to 50 μm, more preferably about 10 to 30 μm.

In the present invention, since the packaging container is usually subjected to severe physical and chemical conditions, strict packaging suitability is required for the packaging material constituting the packaging container. And various conditions such as deformation prevention strength, drop impact strength, pinhole resistance, heat resistance, sealability, quality maintenance, workability, hygiene, etc. are required. Any material that satisfies the above conditions can be selected and used.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, Chillpentene 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, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), polyester resin, polyamide resin, polycarbonate resin, polyvinyl alcohol Resin, saponified ethylene-vinyl acetate copolymer, fluororesin,
It can be arbitrarily selected from known resin films or sheets such as diene resins, polyacetal resins, polyurethane resins, nitrocellulose and others. 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 may be any of unstretched and uniaxially or biaxially stretched. The thickness is arbitrary, but is from several μm to 3 μm.
It can be used by selecting from a range of about 00 μm.
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, any one of the layers constituting the laminated material according to the present invention may be formed by, for example, offset printing, gravure printing, silk screen printing, or any other desired method including characters, figures, patterns, symbols, etc. It goes without saying that a print pattern layer can also be formed.

Next, in the present invention, a method of manufacturing a laminated material using the above-mentioned materials will be described.
Examples of such a method include laminating ordinary packaging materials, for example, wet lamination, dry lamination, solventless dry lamination, extrusion lamination, T-die extrusion molding, and the like. It can be performed by an extrusion lamination method, an inflation method, a co-extrusion inflation method, or the like.
Thus, in the present invention, when performing the above-mentioned lamination, if necessary, a pretreatment such as a corona treatment or an ozone treatment can be performed on the film, and for example, an isocyanate-based (urethane) ), Polyethyleneimine-based, polybutadiene-based, organotitanium-based anchor coating agents, or polyurethane-based, polyacryl-based, polyester-based, epoxy-based, polyvinyl acetate-based, cellulose-based, and other laminating agents. A known pretreatment, such as adhesive for
An anchor coat agent, an adhesive or the like can be used.

Next, in the present invention, a method for producing a bag or a box using the above-described laminated material will be described. For example, when the packaging container is a soft packaging bag made of a plastic film or the like, Using a laminated material manufactured by such a method, the heat-sealing resin layer of the inner layer is made to face the surface, and it is folded or the two sheets are overlapped, and furthermore, the peripheral edge portion is formed. A bag can be formed by providing a seal portion by heat sealing. Thus, as the bag making method, the above-mentioned laminated material is folded with its inner layer facing the surface, or two of them are overlapped,
Further, the peripheral end portion of the outer periphery is formed, for example, by a side seal type, a two-side seal type, a three-side seal type, a four-side seal type, an envelope-attached seal type, and a gasket-attached seal type ( According to the present invention, a heat seal is formed according to a heat seal form such as a (pyrro-seale type), a pleated seal type, a flat bottom seal type, a square bottom seal type, and the like. Various forms of packaging containers can be manufactured. Others, for example, self-supporting packaging bags (standing pouches)
And the like can be manufactured, and in the present invention, a tube container and the like can be manufactured using the above-mentioned laminated material. In the above, as a method of heat sealing, for example, a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, an ultrasonic seal,
Can be performed by a known method such as In the present invention, a spout such as a one-piece type, a two-piece type, etc., or a zipper for opening and closing can be arbitrarily attached to the packaging container as described above.

Next, in the case of a liquid-filled paper container containing a paper substrate as a packaging container, for example, a laminated material in which a paper substrate is laminated is produced as a laminated material, and a desired paper container is produced therefrom. A blank plate is manufactured, and thereafter, a body, a bottom, a head and the like are manufactured using the blank plate to manufacture, for example, a liquid paper container of a brick type, a flat type or a gable-top type. be able to. Moreover, the shape can be manufactured by any of a rectangular container, a circular or other cylindrical paper can, and the like. In the present invention, in particular, when manufacturing the above-mentioned paper container or the like, the foldability and engraving ability for engraving the crease lines and the like can be remarkably improved, thereby improving the sealing failure and the like. It is possible to improve the stability of the seal in the seal portion.

In the present invention, the packaging container produced as described above may be used for various foods and drinks such as liquid beverages, confectionery, powdery, liquid or solid seasonings, and other adhesives, adhesives and pressure-sensitive adhesives. It is used for filling and packaging of various articles such as chemicals, detergents, cosmetics such as others, pharmaceuticals, miscellaneous goods such as chemical warmers, and others. The laminated material according to the present invention can be used as a lid material, for example, by being attached to a flange portion of a plastic molded container. In particular, in the present invention, it has excellent low-temperature heat sealability and suitability for high-speed filling and packaging, and further has excellent liquid bite heat sealability with attached contents and the like, and is extremely sealable.
A seal portion having excellent sealing strength can be formed, thereby having excellent strength and the like, and having bag-breaking resistance, and preserving the contents without impairing the flavor and taste. Excellent,
In particular, sauce, soy sauce, dressing, ramen soup,
It is useful for filling and packaging liquid seasonings such as noodle juice, ketchup, tabasco, wasabi, mustard, etc., liquid soups, soups, etc., and useful for producing small-package packaged products.

[0031]

EXAMPLES The present invention will be described more specifically with reference to examples. Example 1 Polyvinylidene chloride resin coating layer having a thickness of 12 μm
A biaxially stretched polyethylene terephthalate film is used, and a urethane-based coating agent is coated on the surface of the polyvinylidene chloride resin coating layer by a gravure roll coating method to have a thickness of 0. An anchor coating agent layer consisting of 0.5 g / m ² (dry state) was formed, and then a linear low-density polyethylene resin composition was provided on the surface of the anchor coating agent layer formed above, A resin composition consisting of 80 parts by weight of a copolymer of ethylene and 1-hexene polymerized using a metallocene catalyst and 20 parts by weight of butyl rubber was coextruded using a T-die co-extruder. A pressure-resistant layer of 20 μm in thickness made of a linear low-density polyethylene resin, and a 30 μm-thickness of a copolymer of ethylene and 1-hexene polymerized using a metallocene catalyst and butyl rubber. -A laminated resin according to the present invention was produced by forming a sealable resin layer. Next, the laminated material produced above was used, and further, a soy sauce as a liquid seasoning was filled and packaged using a three-sided seal type small bag filling and packaging machine to produce a small bag packaged product. The small bag-packaged product manufactured as described above is excellent in low-temperature heat sealability and can be packed at a high speed.
Even when sealing was performed, a seal portion having excellent strength could be formed, and no leakage of liquid from the packaged product was observed.

Example 2 15 μm thick having a polyvinylidene chloride resin coating layer
A biaxially stretched nylon film is used, and the surface of the polyvinylidene chloride resin coat layer is coated with a urethane anchor coat.
The coating agent was coated by a gravure roll coating method to form an anchor coating agent layer having a thickness of 0.5 g / m ² (dry state), and then the anchor coating layer formed above was formed. On the surface of the agent layer, a linear low-density polyethylene resin composition, a resin composition comprising 80 parts by weight of a copolymer of ethylene and 1-hexene polymerized using a metallocene catalyst and 20 parts by weight of butyl rubber These are co-extruded using a T-die co-extruder, and the pressure-resistant strength layer having a thickness of 20 μm made of the linear low-density polyethylene resin of the former and ethylene polymerized by using the metallocene catalyst of the latter are used. A heat-sealing resin layer having a thickness of 30 μm comprising a copolymer of 1-hexene and butyl rubber was formed to produce a laminated material according to the present invention. Next, the laminated material produced above was used, and further, a soy sauce as a liquid seasoning was filled and packaged using a three-sided seal type small bag filling and packaging machine to produce a small bag packaged product. The sachet packaging product manufactured as described above is excellent in low-temperature heat sealability and can be filled at high speed, and even if the contents such as soy sauce are interposed and the liquid bite heat seal is used, A seal part having excellent strength could be formed, and no leakage of liquid from the packaged product was observed.

Example 3 A biaxially stretched nylon film having a thickness of 15 μm was used, and a two-component curable polyurethane-based laminating adhesive was coated on one surface by a gravure roll coating method. An adhesive layer for lamination having a thickness of 2.5 g / m ² (in a dry state) is formed, and then, a layer having a vapor deposition film of aluminum on the surface of the adhesive layer for lamination formed as described above has a thickness of 12 g / m ^2.
A biaxially stretched polyethylene terephthalate film having a thickness of μm was overlapped with the surface of the biaxially stretched polyethylene terephthalate film facing each other, and both were dry-laminated. Next, a urethane-based anchor coating agent was coated with a gravure roll coat on the surface of the aluminum-deposited film of the biaxially stretched polyethylene terephthalate film having a thickness of 12 μm having the aluminum-deposited film dried as described above. Coating to form an anchor coating agent layer having a thickness of 0.5 g / m ² (dry state).
On the surface of the anchor coating agent layer formed above, a linear low-density polyethylene resin composition, 80 parts by weight of a copolymer of ethylene and 1-hexene polymerized using a metallocene catalyst, and 20 parts by weight of butyl rubber And a co-extrusion thereof using a T-die co-extruder, and a pressure-resistant strength layer of 20 μm in thickness made of the former linear low-density polyethylene resin, and a metallocene of the latter A heat-sealing resin layer having a thickness of 30 μm comprising a copolymer of ethylene and 1-hexene polymerized by using a catalyst and butyl rubber was formed to produce a laminated material according to the present invention. next,
Using the laminated material produced as described above, a three-sided seal-type small bag filling and packaging machine was used to fill and package Ramen soup as a liquid seasoning to produce a small bag-packaged product. The sachet packaging product produced above is excellent in low-temperature heat sealability and can be filled at high speed.
Even if the contents such as a bottle were interposed and the liquid biting heat seal was used, a seal portion having excellent strength could be formed, and no liquid leakage from the packaged product was observed.

Example 4 A 12 μm-thick biaxially stretched polyethylene terephthalate film having a silicon oxide vapor-deposited film was used, and the surface of the silicon oxide vapor-deposited film was used for a two-component curing type polyurethane laminate. The adhesive is coated by a gravure roll coating method to obtain a laminate having a thickness of 2.5 g / m ² (dry state).
Then, a 15 μm-thick biaxially stretched nylon film was superposed on the surface of the laminating adhesive layer formed as described above, and the two were dry-laminated. . Next, the surface of the biaxially stretched nylon film dry-laminated above is coated with a urethane-based anchor.
The coating agent is coated by a gravure roll coating method to form an anchor coat having a thickness of 0.5 g / m ² (dry state).
And then the anchor layer formed above is formed.
On the surface of the agent layer, a linear low-density polyethylene resin composition, a resin composition comprising 80 parts by weight of a copolymer of ethylene and 1-hexene polymerized using a metallocene catalyst and 20 parts by weight of butyl rubber These are co-extruded using a T-die co-extruder, and the pressure-resistant strength layer having a thickness of 20 μm made of the linear low-density polyethylene resin of the former and ethylene polymerized by using the metallocene catalyst of the latter are used. 30 μm in thickness consisting of a copolymer of 1-hexene and butyl rubber
Thus, a laminated material according to the present invention was manufactured by forming a heat-sealable resin layer of m. Next, using the laminated material produced above, further, using a three-sided seal-type sachet filling and packaging machine, filling and packaging Ramen soup as a liquid seasoning, a sachet packaging product is obtained. Manufactured. The sachet packaging product manufactured above is
It is excellent in low-temperature heat sealability and can be filled at high speed. In addition, even if heat such as a liquid bite heat seal is present due to interposition of contents such as a ramen soup, it is excellent in strength. -No leakage was found from the packaged product.

Example 5 A biaxially stretched polyethylene terephthalate film having a thickness of 12 μm was used, and a two-part curable polyurethane-based laminating adhesive was coated on one surface by a gravure roll coating method. To form a laminate adhesive layer having a thickness of 2.5 g / m ² (in a dry state). Then, a 7 μm-thick aluminum foil is formed on the surface of the laminate adhesive layer formed above. Were placed facing each other, and both were dry-laminated. Next, a two-part curable polyurethane-based laminating adhesive is applied onto the surface of the dry-laminated aluminum foil in the same manner as described above.
Coating method to form a laminate adhesive layer having a thickness of 2.5 g / m ² (dry state),
On the surface of the laminating adhesive layer formed above, a thickness of 12
A biaxially stretched polyethylene terephthalate film having a thickness of μm was superposed on each other so as to face each other, and both were dry-laminated. Next, a urethane-based anchor coating agent was coated on the surface of the biaxially stretched polyethylene terephthalate film dry-coated above by a gravure roll coating method to a thickness of 0.5 g / m ^2. (Dry state) An anchor coating agent layer was formed, and then the linear low density polyethylene resin composition and a metallocene catalyst were applied to the surface of the anchor coating agent layer formed above. Polymerized ethylene and 1
Using a resin composition consisting of 80 parts by weight of a copolymer with hexene and 20 parts by weight of butyl rubber, and extruding these using a T-die co-extruder to obtain the former linear low-density polyethylene resin And a 30 μm thick heat-sealing resin layer made of a copolymer of ethylene and 1-hexene polymerized by using the latter metallocene catalyst and butyl rubber. Thus, a laminated material according to the present invention was manufactured. Next, using the laminated material produced above, further, using a three-sided seal-type sachet filling and packaging machine, filling and packaging a dressing as a liquid seasoning,
Manufactured sachet packaging products. The small bag packaged product manufactured as described above is excellent in low-temperature heat sealability and can be filled at high speed, and even if the contents such as dressing are interposed and the liquid bite heat seal is used, A seal part having excellent strength could be formed, and no leakage of liquid from the packaged product was observed.

Example 6 A 12 μm-thick biaxially stretched polyethylene terephthalate film having a silicon oxide vapor-deposited film was used, and a urethane-based anchor coating agent was gravure-coated on the surface of the self-deposited silicon oxide film. -0.5 g of thickness by coating
/ M ² (in a dry state) to form an anchor coating agent layer, and then, on the surface of the anchor coating agent layer formed above, a linear low-density polyethylene resin composition and a metallocene catalyst Using a resin composition consisting of 80 parts by weight of a copolymer of ethylene and 1-hexene polymerized by using a resin composition comprising 20 parts by weight of butyl rubber, and extruding these using a T-die co-extruder. Pressure-resistant layer having a thickness of 20 .mu.m made of a linear low-density polyethylene resin, and a 30 .mu.m thick heat-resistant layer made of a copolymer of ethylene and 1-hexene polymerized using a metallocene catalyst and butyl rubber. To form a laminated material according to the present invention. Next, using the laminated material produced above,
A soy sauce as a liquid seasoning was filled and packaged using a small-seal type small bag filling and packaging machine to produce a small bag packaged product. The sachet packaging product manufactured as described above is excellent in low-temperature heat sealability and can be filled at high speed, and even if the contents such as soy sauce are interposed and the liquid bite heat seal is used, A seal part having excellent strength could be formed, and no leakage of liquid from the packaged product was observed.

[0037]

As is apparent from the above description, the present invention first uses a conventional laminated material, heat-seales the heat-sealing resin layers, and heat-seales the heat-sealing resin layer. When the portion is heat-pressed and heat-sealed, the heat-sealing resin constituting the heat-sealing resin layer of the portion to be heat-sealed is extruded in the flow direction by heating and pressing. The heat-sealable resin constituting the heat-sealable resin layer corresponding to the heat-seal portion becomes thin,
Even if a portion corresponding to the heat seal portion is heat-sealed to form a seal portion, a seal portion having sufficient seal strength is formed. Focus on the phenomenon that is extremely difficult, and, based on such attention, at least, a base film, a barrier layer, and,
In a laminated material composed of three layers of a heat-sealing resin layer, a laminated material is produced by providing a pressure-resistant strength layer made of a heat-meltable resin or the like between the barrier layer and the heat-sealing resin layer. Then, the laminated material is used, the heat-sealing resin layer is made to face the surface, and while the contents are being packed and packed, the edges around the outer periphery are heat-sealed to form a packaged product. It is excellent in low-temperature heat sealability, low-temperature hot sealability and the like, and has high suitability for high-speed filling and packaging.
Excellent sealability, etc., has sufficient seal strength, there is no leakage of the contents, etc., and further, without impairing the flavor, taste, etc., it is excellent in the preservability of the contents, especially, Liquid seasonings,
The present invention is capable of producing a laminate which is very useful for producing a liquid pouch packaged product by filling and packaging a liquid food or drink such as a soup or the like, and a packaging container using the same.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a layer configuration of a laminated material according to the present invention.

FIG. 2 is a schematic perspective view showing an example of the configuration of a packaging container according to the present invention made by using the laminated material shown in FIG.

FIG. 3 is a schematic perspective view showing an example of the configuration of a packaged product obtained by filling and packing contents in the packaging container according to the present invention shown in FIG.

FIG. 4 is a schematic configuration diagram illustrating an example of a filling and packaging apparatus that uses a laminated material according to the present invention, is in the form of a small bag for individual packaging, and fills and packs liquid food and drink.

FIG. 5 is a schematic configuration diagram illustrating a part of a seal part in the filling and packaging apparatus shown in FIG.

[Description of Signs] A Laminated material B Packaging container C Packaging product 1 Base film 2 Barrier layer 3 Pressure resistant layer 4 Heat-sealing resin layer 5 Seal 6 Opening 7 Contents 8 Upper sheet -Part

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Shimizu 1-1-1 Ichigaya-Kagacho, Shinjuku-ku, Tokyo F-term in Dai Nippon Printing Co., Ltd. (reference) 3E064 BA17 BA24 BA30 BA36 BA38 BA40 BA54 BB03 BC08 BC18 EA07 3E086 AA23 AD01 BA04 BA13 BA15 BB02 BB05 BB51 4F100 AA19B AA20B AB10B AB33B AK01A AK01C AK01D AK03C AK03D AK03E AK07A AK09 AK09J AK16B AK28 AK28J AK41A AK46A AK51G AK62 AK63 AK69B AL01 AL05 AN02 AR00B AR00C BA04 BA05 BA07 BA10A BA10D BA13 CB02 EH20C EH20D EH20E EH66B EJ38A EJ65 GB17 GB23 JB16C JB16D JB16E JD02B JD05 JK02C JK06 JL00 JL12D JL12E

Claims (10)

[Claims] 1. A laminated material characterized by laminating at least a base film, a barrier layer, a pressure-resistant strength layer, and a heat-sealing resin layer in this order. 2. A base film comprising a biaxially stretched polyester resin film, a biaxially stretched polyamide resin film,
The laminate according to claim 1, wherein the laminate is made of a biaxially stretched polypropylene resin film. 3. A barrier layer comprising an aluminum foil, an aluminum vapor-deposited film, a polyvinylidene chloride-based resin layer, an ethylene-vinyl alcohol copolymer layer, or a silicon oxide or aluminum oxide vapor-deposited film. The laminated material according to claim 1 or 2, wherein: 4. The laminated material according to claim 1, wherein the pressure-resistant strength layer comprises a heat-meltable resin layer. 5. The pressure-resistant layer according to claim 1, wherein the pressure-resistant layer comprises a heat-meltable polyolefin resin layer.
The laminated material described in. 6. The laminated material according to claim 1, wherein the heat-sealing resin layer comprises a heat-fusible resin layer. 7. The laminated material according to claim 1, wherein the heat-sealing resin layer comprises a heat-meltable polyolefin resin layer. 8. The laminated material according to claim 1, wherein the heat-sealing resin layer comprises a single or co-extruded resin layer of a hot-melt polyolefin resin. 9. The laminated material according to claim 1, wherein the pressure-resistant strength layer and the heat-sealing resin layer are formed of a co-extruded resin layer of a heat-meltable polyolefin resin. . 10. A laminate having at least a base film, a barrier layer, a pressure-resistant layer, and a heat-sealing resin layer laminated in this order, and having a heat-sealing property. A packaging container characterized in that the surfaces of the resin layer are opposed to each other, and the end around the outer periphery is heat-sealed.