JP2000226024A - Paper container for liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an exterior layer easily reusable and to make an interior layer easily disposable by a method wherein the exterior layer formed mainly of paper and the interior layer mainly formed of plastic are made separable. SOLUTION: A laminated body is separated into an exterior layer comprising a polyethylene layer 1, a paper layer 2, and an adhesive resin layer 3, and an interior layer comprising a dotted separating layer 4a, a solid separating layer 4b, a gas-barrier layer 5, a plastic film layer 6, and a polyethylene layer 7 by making separation between the adhesive resin layer 3 and the dotted separating layer 4a. By successively forming and laminating the solid separating layer 4b and the dotted separating layer 4a on the gas barriering layer 5 with resin, adhesive strength between the adhesive resin layer 3 and the dotted separating layer 4a and the solid separating layer 4b does not practically become problem when formed into a paper container for liquid, and the lamination is divided into the exterior layer mainly formed of paper and the interior layer mainly formed of plastic, separation thereof can be made between the adhesive resin layer 3 and the dotted separating layer 4a and the solid separating layer 4b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reusing a used paper container by allowing a laminate constituting a container to be easily separated into an outer layer mainly composed of paper and an inner layer mainly composed of plastic. The present invention relates to a liquid paper container used for packaging liquor, wine, coffee, and the like, which makes it easy to dispose.

[0002]

2. Description of the Related Art Recently, recycling of packaging materials has become a topic of concern for environmental protection, and it has been used in packaging of milk or the like made of a polyethylene / paper / polyethylene laminate even in a gobel-top type paper container. Paper containers
Recycling activities are being carried out and resources are being reused for effective use. On the other hand, in the case of a goebel top type paper container used for packaging of alcohol, wine, coffee, etc., a paper container having excellent gas barrier properties is used for protection of contents, distribution means, and extension of distribution period. Necessary, polyethylene / paper / ethylene-acrylic acid copolymer / aluminum foil / adhesive / biaxially stretched polyethylene terephthalate /
A laminate made of polyethylene is generally used. Further, recently, a laminate having a structure in which the layer composed of aluminum foil / adhesive / biaxially stretched polyethylene terephthalate in the above-described configuration is a biaxially stretched polyethylene terephthalate having an aluminum vapor deposition layer or a silicon oxide vapor deposition layer has been used. . However, in a paper container made of a laminate having the above-described structure, it is necessary to separate the outer layer mainly composed of paper and the inner layer mainly composed of plastic because the adhesive strength between the layers of the laminate is strong. It is extremely difficult, and it is difficult to reuse a used paper container. Further, since the paper container is extremely rigid, it is difficult to fold and discard the paper container.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to make it possible to separate a laminate into an outer layer mainly composed of paper and an inner layer mainly composed of plastic, and to reuse an outer layer mainly composed of paper. It is an object of the present invention to provide a liquid paper container which is easy to dispose and which is easy to dispose of an inner layer mainly composed of plastic.

[0004]

Means for Solving the Problems A thermoplastic resin layer, a paper layer, an adhesive resin layer, two release layers, an intermediate base material layer and a thermoplastic resin layer are arranged in this order from the outer surface. By making a liquid paper container comprising a laminate that is releasably laminated, the laminate is peeled at the interface between the two release layers,
Since the outer layer mainly composed of paper and the inner layer mainly composed of plastic can be separated, the outer layer mainly composed of paper can be easily reused, and the inner layer mainly composed of plastic becomes less bulky and is discarded. Easier to do.

[0005] In the above liquid paper container, a laminate in which two release layers are sequentially formed on the surface of the intermediate base material layer as a solid release layer and a halftone release layer so as to be peelable between the adhesive resin layer and the halftone release layer. By doing so, the adhesive strength between the adhesive resin layer and the halftone dot peeling layer can be easily adjusted by changing the halftone dot area ratio of the halftone dot peeling layer. The adhesive strength between the point release layers is practically no problem when used as a liquid paper container, and the laminate is peeled between the adhesive resin layer and the halftone release layer, and the outer layer mainly composed of paper and the plastic are mainly used. It is easy to obtain a strength that can be separated into the inner layer.

In the above-described liquid paper container, the intermediate substrate layer is made of a plastic film or a plastic film having a gas barrier layer composed of an aluminum foil, a metal deposition layer, and a metal oxide deposition layer. And a liquid paper container suitable for packaging detergents and the like.

[0007] The liquid paper container is a goebel top type having a front plate, a rear plate, both side plates, a top forming plate and a bottom forming plate, and the outer surfaces of the top forming plate and the bottom forming plate are thermally bonded. By forming the adhesive strength adjusting layer partially in the region to be removed, the thermal bonding portion between the outer surfaces of the top and bottom can be peeled off and the container can be easily dismantled. This makes it easy to separate the laminate into an outer layer mainly composed of paper and an inner layer mainly composed of plastic by separating the laminate between the adhesive resin layer and the release layer.

In the above-mentioned liquid paper container, the both side plates are formed by forming vertical folding curves at the center portions of the top forming plate and the bottom forming plate connected vertically above and below the both side plates. It is easy to fold inside and fold.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a laminated structure of a first embodiment of the present invention, FIG. 2 is a cross-sectional view showing a laminated structure of a second embodiment of the present invention, FIG. FIG. 4 is a partial perspective view showing a procedure of peeling and disassembling an adhesive portion between outer surfaces of a bottom forming plate of a goebel top type container, FIG. 5 is a perspective view showing a folded state of the goebel top type container, and FIG. FIG. 7 is a perspective view showing a state in which the outer layer made of paper, paperboard and adhesive resin starts to be peeled from the end of the container. FIG. 7 is a perspective view showing a state in which the outer layer is peeled over the entire length of the container. FIG. 8 is an outer layer and an inner layer. It is a perspective view showing a method of creating a trigger for peeling off,
1, 7 is a polyethylene layer, 2 is a paper layer, 3 is an adhesive resin layer,
4a is a dot release layer, 4b is a solid release layer, 5 is a gas barrier layer, 6 is a plastic film layer, 10a and 10b are adhesive strength adjusting layers, 11, 12, 13, and 14 are side plates, 11a, 12a, and 13a. , 14a
Denotes a top forming plate, 11b, 12b, 13b, and 14b denote bottom forming plates, 15 denotes an adhesive plate, 16 and 17 denote curved lines, and 18 denotes a bottom edge bonding portion.

As shown in FIG. 1, the laminated structure of the liquid paper container according to the first embodiment of the present invention comprises a polyethylene layer 1, a paper layer 2, an adhesive resin layer 3, a dot release layer 4a, and a solid release in this order from the outer surface. Layer 4b, gas barrier layer 5, and plastic film layer 6
And a polyethylene layer 7 are laminated, and polyethylene 1 and polyethylene 7 are used as thermoplastic resin layers laminated on the outer surface and the inner surface. The intermediate base material layer is composed of a gas barrier layer 5 and a plastic film layer 6, the gas barrier layer 5 is composed of an aluminum foil, a metal deposition layer, and a metal oxide deposition layer, and two release layers are sequentially formed on the gas barrier layer 5 surface. It is formed of a solid release layer 4b and a halftone release layer 4a. In the case of the first embodiment, the laminate is peeled between the adhesive resin layer 3 and the halftone dot peeling layer 4a, and the outer surface layer composed of the polyethylene layer 1, the paper layer 2 and the adhesive resin layer 3, and the halftone dot peeling layer 4a And a solid release layer 4b, a gas barrier layer 5, a plastic film layer 6, and an inner surface layer composed of a polyethylene layer 7.

As the resin forming the halftone dot release layer 4a in the first embodiment, shellac, polyamide, cellulose such as nitrocellulose, cellulose acetate, butyl cellulose and the like can be used. As the resin forming the solid release layer 4b, polyamide is used. , Shellac and the like can be used. Halftone release layer
The combination of the resin forming 4a / the resin forming the solid release layer 4b is shellac / polyamide, polyamide / shellac, cellulose / shellac and the like. By forming and laminating the solid release layer 4b and the halftone release layer 4a in this order on the gas barrier layer 5 using the above resin, the adhesive resin layer 3 and the halftone release layer 4a and the solid release layer 4b are interposed. The adhesive strength has no practical problem when used as a liquid paper container, and the laminate is made of the adhesive resin layer 3, the dot release layer 4a and the solid release layer.
By peeling between 4b, the outer layer mainly composed of paper and the inner layer mainly composed of plastic can be separated.

As shown in FIG. 2, the laminated structure of the liquid paper container according to the second embodiment of the present invention is, as shown in FIG. 2, a polyethylene layer 1, a paper layer 2, an adhesive resin layer 3, a dot release layer 4a, and a solid release layer. Layer 4b, plastic film layer 6, and gas barrier layer 5
And the polyethylene layer 7 are laminated. In the second embodiment, as compared with the first embodiment, the order of lamination of the plastic film layer 6 serving as the intermediate base material layer and the gas barrier layer 5 is reversed, and two release layers are formed on the surface of the plastic film layer 6. In that they are formed in this order. In the case of the second embodiment, the laminate is peeled between the adhesive resin layer 3 and the dot release layer 4a, and the polyethylene layer 1 and the paper layer 2 are separated.
And an outer layer composed of an adhesive resin layer 3 and an inner layer composed of a halftone release layer 4a, a solid release layer 4b, a plastic film layer 6, a gas barrier layer 5, and a polyethylene layer 7. .

In the second embodiment, as the resin forming the dot release layer 4a, cellulose such as nitrocellulose, cellulose acetate, butyl cellulose, polymethyl methacrylate (PMMA), polyethyl methacrylate (PEMA), polybutyl methacrylate ( PBMA)
And the like, and a vinyl chloride-vinyl acetate copolymer and the like can be used, and urethane and the like can be used as the resin forming the solid release layer 4b. The combination of the resin forming the dot release layer 4a / the resin forming the solid release layer 4b includes cellulose / urethane, acryl / urethane, vinyl chloride-vinyl acetate copolymer / urethane, and the like. By forming and laminating the solid release layer 4b and the halftone release layer 4a on the surface of the plastic film layer 6 in order using the above resin, the adhesive resin layer 3 and the halftone release layer 4a and the solid release layer 4b are interposed. Adhesive strength has no practical problem when used as a liquid paper container, and the laminate is peeled between the adhesive resin layer 3 and the halftone dot peeling layer 4a.
The strength which can be separated into the outer layer mainly composed of paper and the inner layer mainly composed of plastic is obtained.

The dot release layer 4a in the first and second embodiments
Can be 10 to 100%. When the dot area ratio is 100%, the two release layers become two solid release layers. The shape of the halftone dot is generally a grid pattern, but the shape of the halftone dot is arbitrary and may be any regular pattern. The halftone dot area ratio of the halftone dot peeling layer 4a is 10
By changing the adhesive strength between the adhesive resin layer 3 and the halftone dot release layer 4a and the solid release layer 4b by changing it within the range of
Since it can be adjusted in the range of 100 g / 15 mm width, there is no problem in practical strength when a liquid paper container such as a goebel top type is produced, and the laminate is formed of a paper-based outer layer and a plastic. It is easy to obtain a laminate having a strength that can be separated into an inner layer mainly composed of

The halftone dot release layer 4a can be formed by printing an ink made of the above resin using a gravure halftone plate having a halftone dot area ratio of 10 to 100%. It can be formed by printing an ink made of the above resin using a gravure solid plate. The halftone release layer 4a and the solid release layer 4b preferably have a thickness of 0.3 to 1.5 μ, and can be formed by a gravure printing plate having a depth of 20 to 40 μ. The two release layers consisting of the halftone release layer 4a and the solid release layer 4b are sequentially solid on the gas barrier layer 5 in the first embodiment, and on the plastic film layer 6 in the second embodiment. It can be formed by overprinting the release layer 4b and the halftone release layer 4a.

The polyethylene layer 1 is made of low-density polyethylene, and the polyethylene layer 6 is made of low-density polyethylene, medium-low-density polyethylene, linear low-density polyethylene, or ethylene-polymerized using a single-site catalyst.
Alpha olefin copolymer is used. 2 for paper layer 2
A paperboard with a basis weight of 50 to 450 g / m ² is used. As the adhesive resin layer 3, low-density polyethylene, ionomer,
Ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer and the like are used. As the gas barrier layer 5, an aluminum foil having a thickness of 6 μm to 9 μm, a metal deposited layer of aluminum or the like, or a metal oxide deposited layer of silicon oxide or the like is used. As the plastic film layer 6, biaxially stretched polyethylene terephthalate, biaxially stretched nylon,
Axial-stretched polypropylene or the like is used.

The shape of the liquid paper container of the present invention may be any shape such as a Goebel top type container or a flat top type container. Hereinafter, the Gebel top type container will be described. As shown in FIG. 3, a blank plate for producing a goebel top type container is composed of side plates 11, 12, 13, 14 and an adhesive plate 15.
Are connected via creases, and the side plates 11,1
Top forming plates 11a, 12a, 13a, 14a and bottom forming plates 11b, 12b, 13b, 14b are connected to the upper and lower edges of 2, 13, 14 via folds, respectively. In the center, a folding curve 16 is formed in the vertical direction, and the top forming plates 12a and 14a and the bottom forming plate
In the center of 12b, 14b, a folding curve 17 is formed in the longitudinal direction, and the side plates 11, 12, 13, 14 and the top forming plates 11a, 12a, 13a, 14a or the bottom forming plates 11b, 12b, 13b, 14b are connected. It is formed in a state excluding predetermined dimensions above and below the folded rule. Top forming plate 11
In the areas where the surfaces of a, 12a, 13a, and 14a are thermally bonded and the areas where the surfaces of the bottom forming plates 11b, 12b, 13b, and 14b are thermally bonded, the partial adhesive strength adjustment layer 10a and the adhesive strength are respectively provided. An adjustment layer 10b is formed. The printed pattern layer is formed on the surface of the blank except for the region to be thermally bonded.

The adhesive strength adjusting layers 10a and 10b are made of ethylene-vinyl acetate copolymer, chlorinated ethylene-vinyl acetate copolymer, chlorinated polyethylene, chlorinated polypropylene, cyclized rubber, polyamide resin, urethane resin, acrylic It can be formed by printing using a resin ink consisting of a simple resin, a cellulose resin, or an alkyd resin, or a mixture thereof. Adhesive strength adjusting layer 10a,
The area for forming 10b is the area where the surfaces of the top forming plates 11a, 12a, 13a and 14a are thermally bonded and the bottom forming plates 11b, 12b and 13a.
It is preferable that the surface area of b, 14b is 20% or more of the area to be thermally bonded.

The blank plate shown in FIG. 3 is formed into a tubular shape by thermally bonding the side plate 11 and the adhesive plate 15, and the bottom forming plates 11b, 12b,
After the bottoms are formed by bending and heat-bonding 13b and 14b, the tops are formed by bending and heat-bonding the top forming plates 11a, 12a, 13a and 14a to obtain a Goebel top type container. When disposing the goebel top type container, the top forming plates 12a, 14 provided with the adhesive strength adjusting layer 10a
The surfaces of a are peeled off from the thermally bonded portions, and the bottom forming plates 12b, 13b, 14b provided with the adhesive strength adjusting layer 10b are provided.
The top and bottom of the Goebel top type container are dismantled by peeling off the parts where the surfaces of the
2 and 14 are bent inward at a folding curve 16 at the center in the width direction, and the top forming plates 12a and 14a and the bottom forming plates 12b and 14b are bent.
Can be folded as shown in FIG. 5 by bending each inward at the folding curve 17 at the center in the width direction.

The procedure for disassembling the bottom of the Goebel top type container by peeling off the portions where the surfaces of the bottom forming plates 12b, 13b and 14b provided with the adhesive strength adjusting layer 10b are thermally bonded is shown in FIG.
As shown in FIG. 4A, the bottom edge bonding portion 18 is peeled off from the bottom forming plate 13b from the state shown in FIG.
The state shown in (b) is assumed. Further, the surfaces of the bottom forming plates 12b and 14b are separated from each other by heat-bonding to separate the edge bonding portions 18, and the bottom forming plates 12b and 14b are folded from the state shown in FIG. Bent inward at curve 17 and Fig. 4 (d)
State. Next, by bending the side plates 12 and 14 inward at the folding curve 16 at the center in the width direction, and bending the top forming plates 12a and 14a inward at the folding curve 17 at the center in the width direction, The container is in the folded state shown in FIG.

In the folded state of the paper container shown in FIG. 5, the corner of the side end where the end of the laminated body bonded to the bonding plate 15 of the rear plate 11, the top forming plate 11a and the bottom forming plate 11b is exposed. By bending and loosening the ends, the laminate can be separated between the adhesive resin layer 3 and the halftone dot peeling layer 4a and the solid peeling layer 4b. Therefore, as shown in FIG. 6, the top forming plate 11a and the bottom The outer layer composed of the polyethylene layer 1, the paper layer 2, and the adhesive resin layer 3 is peeled off from the corners of the forming plate 11b, and the rear plate 11, the top forming plate 11a, and the bottom forming plate 11 are separated as shown in FIG.
It can be peeled over the entire length of the side end of b.
Also, as shown in FIG. 8, the adhesive portion between the outer surfaces of the top thermal adhesive portion is peeled off, and then the thermal adhesive portion between the inner surfaces is pulled to break the inner surface adhesive portion from the adhesive end portion and open the adhesive resin. A trigger is formed between the layer 3 and the dot release layer 4a and the solid release layer 4b to separate the laminate into an outer surface layer and an inner surface layer.

[0022]

Example 1 A 7μ aluminum foil, a 12μ biaxially stretched polyethylene terephthalate film and a 60μ polyethylene film were laminated in this order using a urethane-based adhesive, and then the following composition was applied to the aluminum foil surface in this order. A solid release layer is formed by printing with a gravure solid plate having a depth of 30μ using the solid release layer ink, and then a halftone release layer ink having the following composition is used on the solid release layer surface at a depth of 30μ. A dot release layer was formed by printing with a gravure halftone plate having a dot area ratio of 50% to prepare a laminated film. [Composition of solid release layer ink (parts by weight)] Polyamide (Versamide 940, Henkel white water) 30 Isopropyl alcohol: toluene = 1: 1 (solvent) 70 [Composition of halftone release layer ink (parts by weight)] Shellac (Lack glaze) 20E, Nippon Shellac Co., Ltd.) 20 Ethanol (solvent) 80 Separately, 30 μ polyethylene was laminated on one surface of a 400 g paperboard by extrusion coating, and the other surface of the paperboard and the release layer surface of the laminated film produced above were By extrusion lamination with 25μ thick polyethylene,
Polyethylene 30μ / paperboard 400g / polyethylene 25
A laminate comprising μ / dot release layer / solid release layer / aluminum foil 7μ / adhesive / biaxially stretched polyethylene terephthalate 12μ / adhesive / polyethylene 60μ was prepared.
25 μ polyethylene layer and halftone dot release layer of the obtained laminate /
The adhesive strength between the solid release layers is 40 g / 15 mm width,
It had practically no problem in the case of a gobel-top type liquid paper container. A printed pattern is formed on the 30 μ side of polyethylene of the laminate and an adhesive strength adjustment layer is formed by printing in a predetermined area, and then a blank plate for a gobel top type container is prepared by punching, and the blank plate is attached to a cylinder. The top and the bottom were formed by heat bonding to produce a Goebel top type container. By peeling off the adhesive part between the outer surfaces at the top and bottom of the obtained goebel top type liquid paper container and disassembling it, by loosening the corner end of the folded container with the container folded,
The laminate is peeled between the polyethylene 25μ layer and the halftone release layer / solid release layer to form an outer layer mainly composed of polyethylene / paperboard / polyethylene paper, and the halftone release layer / solid release layer / aluminum foil / adhesive / A biaxially stretched polyethylene terephthalate / adhesive / polyethylene as a main layer.

Example 2 A 12 μm biaxially stretched polyethylene terephthalate film, a 7 μm aluminum foil and a 60 μm polyethylene film were laminated in this order using a urethane-based adhesive. Using the solid release layer ink and the halftone dot release layer ink of the composition, printing was performed in the same manner as in Example 1 to form a solid release layer and a halftone release layer. / 400g paperboard / 25μ polyethylene
A laminate comprising: / dot release layer / solid release layer / biaxially stretched polyethylene terephthalate 12μ / adhesive / aluminum foil 7μ / adhesive / polyethylene 60μ was prepared. [Composition of solid release layer ink (parts by weight)] Urethane resin (SAMPLEN IB1300, Sanyo Chemical) 20 MEK: IPA = 2: 1 (solvent) 80 [Composition of halftone release layer ink (parts by weight)] Nitrocellulose (SS1) / 4, Daicel Chemical Industries) 25 Ethyl acetate: toluene = 2: 3 (solvent) 75 25 μ polyethylene layer and halftone dot release layer of the obtained laminate /
The adhesive strength between the solid release layers is 60 g / 15 mm width,
It had practically no problem in the case of a gobel-top type liquid paper container. Hereinafter, as a result of carrying out in the same manner as in Example 1, the laminate was peeled between the 25 μ layer of polyethylene and the solid release layer / dot release layer, and an outer layer mainly composed of polyethylene / paperboard / polyethylene paper, and a halftone dot It could be separated into a release layer / solid release layer / biaxially stretched polyethylene terephthalate / adhesive / aluminum foil / adhesive / inner layer mainly composed of plastic composed of polyethylene.

[0024]

According to the present invention, a thermoplastic resin layer, a paper layer, an adhesive resin layer, a two-layer release layer, an intermediate base material layer, and a thermoplastic resin layer are sequentially laminated from the outer surface so as to be peelable at an interface between the two release layers. Since it is a liquid paper container composed of a laminated body, the laminated body can be separated at the interface between the two release layers, and separated into an outer layer mainly composed of paper and an inner layer mainly composed of plastic. . Therefore, the outer layer mainly made of paper is easily reused, and the inner layer mainly made of plastic is reduced in bulk and easily discarded. In the above liquid paper container,
By forming the two release layers as a solid release layer and a halftone release layer sequentially formed on the surface of the intermediate base material layer as a laminate capable of being peeled between the adhesive resin layer and the halftone release layer, the adhesive resin layer and the net are separated. Since the adhesive strength between the point release layers can be easily adjusted by changing the dot area ratio of the dot release layer,
The adhesive strength between the adhesive resin layer and the halftone dot peeling layer in the laminate is practically no problem when it is used as a liquid paper container, and the laminate is peeled between the adhesive resin layer and the halftone dot peeling layer, and is mainly made of paper. It is easy to obtain a strength that can be separated into an outer layer and an inner layer mainly composed of plastic. In the above-mentioned liquid paper container, the intermediate substrate layer is made of a plastic film or a plastic film having a gas barrier layer composed of an aluminum foil, a metal deposition layer, and a metal oxide deposition layer, so that alcohol, wine, coffee, detergent, etc. A liquid paper container suitable for packaging. The liquid paper container has a shape of a goebel top including a front plate, a rear plate, both side plates, a top forming plate, and a bottom forming plate, and a region where the outer surfaces of the top forming plate and the bottom forming plate are thermally bonded to each other. By forming an adhesive strength adjustment layer partially on the outer surface of the top and bottom portions, the heat-bonded portions are peeled off from each other, and the container is easily dismantled. The laminate is easily separated between the adhesive resin layer and the release layer and separated into an outer layer mainly composed of paper and an inner layer mainly composed of plastic. In the above-mentioned liquid paper container, both side plates are folded inward by forming a vertical fold curve at the center of the top forming plate and the bottom forming plate connected vertically above and below the both side plates. It becomes easy to fold.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a stacked configuration according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a stacked configuration according to a second embodiment of the present invention.

FIG. 3 is a plan view showing a state of a surface of a blank plate of the goebel top type container.

FIG. 4 is a partial perspective view showing a procedure for peeling and disassembling an adhesive portion between outer surfaces of a bottom forming plate of a goebel top type container.

FIG. 5 is a perspective view showing a folded state of the goebel top type container.

FIG. 6 is a perspective view showing a state in which an outer layer made of polyethylene, paperboard, and an adhesive resin starts to be peeled off from the end of the container.

FIG. 7 is a perspective view showing a state where the outer surface layer is peeled over the entire length of the container.

FIG. 8 is a perspective view showing a method for making a trigger for peeling the outer layer and the inner layer.

[Explanation of symbols]

1,7 Polyethylene layer 10a, 10b Adhesive strength adjusting layer 2 Paper layer 11, 12, 13, 14
Side plate 3 Adhesive resin layer 11a, 12a, 13a, 1
4a Top forming plate 4a Solid release layer 11b, 12b, 13b, 1
4b Bottom forming plate 4b Halftone release layer 15 Adhesive plate 5 Gas barrier layer 16, 17 Fold curve 6 Plastic film layer 18 Bottom edge bonded part

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B65D 5/62 B65D 5/62 A F term (Reference) 3E060 AA05 AB04 BC01 BC04 DA20 DA30 EA03 4F100 AA17E AB01E AB10E AB33E AK01A AK01E AK04 AK42 AK51 AR00C AR00D AT00 AT00E BA05 BA07 BA10A BA33 CB02 DC16C DG10B EC18 EH17 EH66E EJ38 GB16 JB16A JB16E JD02E JL05 JL14 JL14C JL14D

Claims (5)

[Claims] 1. An outer surface comprising a thermoplastic resin layer, a paper layer, an adhesive resin layer, two release layers, an intermediate base material layer, and a thermoplastic resin layer in order from the outer surface. A liquid paper container comprising a laminated body. 2. The method according to claim 1, wherein the two release layers comprise a solid release layer and a halftone release layer sequentially formed on the surface of the intermediate base material layer, and are peelable between the adhesive resin layer and the halftone release layer. The liquid paper container according to claim 1, wherein: 3. The method according to claim 1, wherein the intermediate substrate layer is a plastic film or a plastic film having a gas barrier layer composed of an aluminum foil, a metal deposition layer, and a metal oxide deposition layer. Liquid paper container. 4. The liquid paper container according to any one of claims 1 to 3, wherein the shape of the liquid paper container is a goebel top type including a front plate, a rear plate, both side plates, a top forming plate, and a bottom forming plate. A liquid paper container, wherein an adhesive strength adjusting layer is partially formed in a region where the outer surfaces of the forming plate and the bottom forming plate are thermally bonded. 5. The liquid paper container according to claim 4, wherein
A liquid paper container having a structure in which a vertical folding curve is formed at the center of the top forming plate and the bottom forming plate connected vertically above and below the both side plates, respectively.