JP4580480B2 - Liquid paper container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a liquid which makes it possible to separate a laminated body constituting a container into an outer surface layer mainly composed of paper and an inner surface layer mainly composed of plastic, thereby enabling reuse of the used paper container and facilitating disposal. It relates to paper containers.
[0002]
[Prior art]
Recently, environmental protection has been avoided, and the reuse of packaging materials has become a hot topic, and paper containers used for packaging milk, etc. consisting of polyethylene / paper / polyethylene laminates, even in paper-belt type paper containers. Recycling activities are carried out and effective use is made by reusing resources.
On the other hand, the paper-belt type paper containers used for the packaging of liquor, wine, coffee, etc. are made of paper containers with excellent gas barrier properties for the purpose of protecting the contents, distribution means, and extending the distribution period. A laminate made of polyethylene / paper / ethylene-acrylic acid copolymer / aluminum foil / adhesive / biaxially stretched polyethylene terephthalate / polyethylene is generally used. Further, recently, a laminate having a structure in which the aluminum foil / adhesive / biaxially stretched polyethylene terephthalate layer in the above structure is a biaxially stretched polyethylene terephthalate having an aluminum vapor deposition layer or a silicon oxide vapor deposition layer is used. .
However, in a paper container composed of a laminate having the above-described structure, the adhesive strength between each layer of the laminate is strong, so that it is separated into an outer surface layer mainly composed of paper and an inner surface layer mainly composed of plastic. The paper container is extremely difficult, and it is difficult to reuse the used paper container. Further, since the paper container is extremely rigid, it is difficult to fold and discard the paper container.
[0003]
[Problems to be solved by the invention]
The object of the present invention is to enable the reuse of used paper containers as well as to dispose of the laminated body constituting the paper containers into an outer surface layer mainly composed of paper and an inner surface layer mainly composed of plastic. An object of the present invention is to provide a liquid paper container that is easy to do.
[0004]
[Means for Solving the Problems]
From the outer surface, the thermoplastic resin layer, paper layer, adhesive resin layer, release layer, polyethylene terephthalate film, nylon film, or polypropylene film plastic film, or aluminum vapor deposition layer, silicon oxide vapor deposition layer, aluminum oxide vapor deposition layer comprising a liquid packaging cartons made from a laminate and the intermediate base layer made of plastic film and a thermoplastic resin layer is laminated with a gas barrier layer, the plastic film arm is directly laminated with the peeling layer , said release layer is a polyester resin formed from an acrylic resin and a polyester resin mixture and resin selected from the group consisting of urethane resin, the adhesive resin layer comprises a polyolefin resin, and the release layer and the adhesive resin layer Interfacial adhesive strength is 10-100g / 15m Width or where the release layer is an ethylene - vinyl acetate copolymer, butyral resin and vinyl chloride - formed from selected from the group consisting of vinyl acetate copolymer resin, the adhesive resin layer is a polyolefin resin becomes, the adhesive strength of the interface between the plastic film arm of the release layer and the intermediate base layer is 10 to 100 g / 15 mm width, from the edge which is exposed in the laminate, the interface between the release layer The laminate can be separated into an outer surface layer mainly composed of paper and an inner surface layer mainly composed of plastic. Therefore, the outer surface layer mainly composed of paper can be easily reused, and the inner surface layer mainly composed of plastic is less bulky and can be easily discarded.
[0005]
An intermediate base material layer made of a plastic film having a gas barrier layer made up of a thermoplastic resin layer, a paper layer, an adhesive resin layer, a release layer, an aluminum foil, an aluminum vapor deposition layer, a silicon oxide vapor deposition layer, and an aluminum oxide vapor deposition layer in order from the outer surface; a liquid packaging cartons made from a laminate and the thermoplastic resin layer are laminated, before SL gas barrier layer is laminated directly to said release layer, said release layer is shellac, polyamide resin, polyester resin, vinyl chloride -Formed from a resin selected from the group consisting of vinyl acetate copolymer, butyral resin and acrylic resin, the adhesive resin layer is made of polyolefin resin, and the adhesive strength at the interface between the adhesive resin layer and the release layer is 10 ˜100 g / 15 mm width, or the release layer is formed from an ethylene-vinyl acetate copolymer, Chakujushi layer comprises a polyolefin resin, edge bonding strength of the interface between the pre-SL gas barrier layer of the release layer and the intermediate base layer is 10 to 100 g / 15 mm width, exposed of the laminate Further, the laminate is peeled off at the interface of the release layer, and can be separated into an outer surface layer mainly composed of paper and an inner surface layer mainly composed of plastic.
[0006]
The shape of the liquid paper container is a Goebel top type consisting of 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 to each other. By forming the adhesive strength adjustment layer partially on the top and bottom, the top and bottom thermal bonding parts can be peeled off so that the top and bottom parts can be easily disassembled. It becomes easy to separate into an outer surface layer mainly composed of paper and an inner surface layer mainly composed of plastic.
[0007]
In the liquid paper container described above, the side plates are folded inward by forming a vertical folding line at the center of the top plate and the bottom plate connected to the top and bottom of the side plates and the side plates. It becomes easy to fold with.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing the laminated structure of the first embodiment of the present invention, FIG. 2 is a cross-sectional view showing the laminated structure of the second embodiment of the present invention, and FIG. FIG. 4 is a partial perspective view showing a procedure for peeling and disassembling the adhesive portions on the outer surfaces of the bottom forming plate of the gobble top type container, and FIG. 5 is a perspective view showing the folded state of the gobble top type container. 6 is a perspective view showing a state in which the laminate is peeled from the end portion of the container into an outer surface layer and an inner surface layer, FIG. 7 is a perspective view showing a state in which the outer surface layer is peeled over the entire length of the container, and FIG. It is a perspective view which shows another method of making the inner layer peeled off, wherein 1, 7 is a polyethylene layer, 2 is a paper layer, 3 is an adhesive resin layer, 4 is a release layer, 5 is a plastic film layer, and 6 is Gas barrier layer, 8 and 9 are adhesive strength adjusting layers, 11, 12, 13, 14 Side plate, 11a, 12a, 13a, 14a is a top forming plate, 11b, 12b, 13b, 14b is bottom forming plate 15 is bonded plates, 16, 17 folding line, 18 denotes respectively the bottom edge adhesive portions.
[0009]
As shown in FIG. 1, the laminated structure of the first embodiment of the liquid paper container according to the present invention comprises a polyethylene layer 1, a paper layer 2, an adhesive resin layer 3, a release layer 4, a plastic film layer 5, and a gas barrier in order from the outer surface. The layer 6 and the polyethylene layer 7 are laminated, the intermediate base material layer is composed of the plastic film layer 5 and the gas barrier layer 6, and the gas barrier layer 6 is an aluminum foil, an aluminum vapor deposition layer, a silicon oxide vapor deposition layer, an aluminum oxide vapor deposition layer, etc. The release layer 4 is formed on the surface of the plastic film layer 5. In the case of the first embodiment, the laminate is peeled off at the interface of the release layer 4, and an outer surface layer comprising a polyethylene layer 1, a paper layer 2, and an adhesive resin layer 3, a plastic film layer 5, a gas barrier layer 6, and a polyethylene layer. 7 can be separated into an inner surface layer made of paper, so that the outer surface layer mainly composed of paper can be easily reused, and the inner surface layer mainly composed of plastic is less bulky and can be easily discarded. In the first embodiment, when the content packaged in the liquid paper container does not require so much gas barrier properties, the intermediate base material layer may be a plastic film alone having no gas barrier layer. .
[0010]
In the laminate of the first embodiment, the release layer 4 is formed of a polyester resin, a mixture of an acrylic resin and a polyester resin, a urethane resin, or the like, so that these resins can be used as a polyolefin resin used as the adhesive resin layer 3. Since there is no compatibility and the adhesiveness to the surface of the plastic film layer 5 is excellent, the laminate is peeled between the adhesive resin layer 3 and the peeling layer 4, and the peeling layer 4 is attached to the inner layer and the outer layer and the inner layer. Can be separated. Further, by forming the release layer 4 with an ethylene-vinyl acetate copolymer, a butyral resin, a vinyl chloride-vinyl acetate copolymer, etc., these resins are compatible with the polyolefin resin used as the adhesive resin layer 3. Because it is soluble and the adhesive strength to the surface of the plastic film layer 5 is not so strong, the laminate peels between the release layer 4 and the plastic film layer 5, and the release layer 4 adheres to the outer surface layer and the outer surface layer and the inner surface. The layers can be separated.
[0011]
As shown in FIG. 2, the laminated structure of the second embodiment of the liquid paper container of the present invention is, in order from the outer surface, a polyethylene layer 1, a paper layer 2, an adhesive resin layer 3, a release layer 4, a gas barrier layer 6, and a plastic film. The layer 5 and the polyethylene layer 7 are laminated, the intermediate base material layer is composed of the gas barrier layer 6 and the plastic film layer 5, and the gas barrier layer 6 is composed of an aluminum foil, an aluminum vapor deposition layer, a silicon oxide vapor deposition layer, and an aluminum oxide vapor deposition layer. The release layer 4 is formed on the surface of the gas barrier layer 6. In the second embodiment, the stacking order of the plastic film layer 5 and the gas barrier layer 6 in the first embodiment is reversed. In the case of the second embodiment, the laminate is peeled off at the interface of the release layer 4, and an outer surface layer comprising a polyethylene layer 1, a paper layer 2, and an adhesive resin layer 3, a gas barrier layer 6, a plastic film layer 5, and a polyethylene layer. 7 can be separated into an inner surface layer.
[0012]
In the laminate of the second embodiment, the release layer 4 is formed of shellac, polyamide resin, polyester resin, vinyl chloride-vinyl acetate copolymer, butyral resin, or polymethyl methacrylate (PMMA), polyethyl methacrylate (PEMA), By forming with an acrylic resin such as polybutyl methacrylate (PBMA), these resins are not compatible with the polyolefin resin used as the adhesive resin layer 3 and have excellent adhesion to the gas barrier layer 6 surface. Therefore, a laminated body peels between the adhesive resin layer 3 and the peeling layer 4, and the peeling layer 4 can be isolate | separated into an outer surface layer and an inner surface layer in the state adhering to the inner surface layer. Further, by forming the release layer 4 with an ethylene-vinyl acetate copolymer, this resin is compatible with the polyolefin resin used as the adhesive resin layer 3 and has a low adhesive force with the gas barrier layer 6. Since the laminate is not strong, the laminate peels between the release layer 4 and the gas barrier layer 6, and the release layer 4 can be separated into an outer surface layer and an inner surface layer while adhering to the outer surface layer.
[0013]
The release layer 4 in the first and second embodiments was formed by printing or coating on the plastic film layer 5 surface or the gas barrier layer 6 surface using the ink made of the above resin, and the release layer 4 was formed. The plastic film layer 5 surface or the gas barrier layer 6 surface and the paper layer 2 surface are laminated by extrusion lamination with an adhesive resin layer 3 made of polyolefin resin. Adhesive strength at the peeling interface between the adhesive resin layer 3 and the peeling layer 4 or the peeling layer 4 and the plastic film layer 5 in the first embodiment, and between the adhesive resin layer 3 and the peeling layer 4 or the peeling layer 4 in the second embodiment Since the adhesive strength at the peeling interface between the gas barrier layers 6 can be 10 to 100 g / 15 mm width, respectively, a practically satisfactory strength can be obtained when a liquid paper container such as a Gobeltop type is used. Then, the laminate is peeled off at the interface of the release layer 4, and an outer surface layer composed of the polyethylene layer 1, the paper layer 2, and the adhesive resin layer 3, the plastic film layer 5, the gas barrier layer 6, the polyethylene layer 7, or the plastic film layer 5 And an inner layer composed of a polyethylene layer 7 and an inner layer composed of a gas barrier layer 6, a plastic film layer 5 and a polyethylene layer 7. It can be. The outer surface layer mainly composed of the separated paper can be reused, and the inner surface layer mainly composed of the plastic is less bulky, so that it can be easily discarded.
[0014]
Low density polyethylene is used as the polyethylene layer 1, and low density polyethylene, medium low density polyethylene, linear low density polyethylene, ethylene-α olefin copolymer polymerized using a single site catalyst, etc. are used as the polyethylene layer 7. Is done. In the first and second embodiments, the polyethylene layer is described as the thermoplastic resin on the innermost surface and outermost surface, but the present invention is not limited to this. As the paper layer 2, a paperboard having a basis weight of 250 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-methacrylic acid are used. A methyl copolymer or the like is used, but it is preferable to use low density polyethylene in consideration of price and workability.
[0015]
As the plastic film layer 5, a biaxially stretched film such as biaxially stretched polyethylene terephthalate, biaxially stretched nylon, or biaxially stretched polypropylene having excellent heat resistance and vapor deposition processability is used. As the gas barrier layer 6, an aluminum foil, an aluminum vapor deposition layer, a silicon oxide vapor deposition layer, an aluminum oxide vapor deposition layer, or the like is used. When an aluminum foil is used as the gas barrier layer 6, it is laminated on the surface of the plastic film layer 5 with a urethane-based adhesive or the like, and an aluminum vapor deposition layer, a silicon oxide vapor deposition layer, or an aluminum oxide vapor deposition layer is used as the gas barrier layer 6. For example, after being subjected to an anchor treatment if necessary, it is used in the state of a vapor-deposited plastic film in which aluminum, silicon oxide, and aluminum oxide are vapor-deposited on the surface of the plastic film layer 5.
[0016]
The shape of the liquid paper container of the present invention is arbitrary, such as a gobel top type container or a flat top type container. As shown in FIG. 3, the blank plate for producing the gobber top type container includes a side plate 11, 12, 13, 14 and an adhesive plate 15 connected to each other via a crease, and the side plate 11, 12 , 13, 14 are connected to the top and bottom edges of the top plate 11a, 12a, 13a, 14a and the bottom plate 11b, 12b, 13b, 14b via folding lines, respectively. Folding lines 16 are formed in the vertical direction at the center, and folding lines 17 are formed in the central direction of the top forming plates 12a, 14a and the bottom forming plates 12b, 14b, respectively, and the side plates 11, 12, 13, 14 The formation plates 11a, 12a, 13a, 14a or the bottom formation plates 11b, 12b, 13b, 14b are formed in a state excluding predetermined dimensions above and below the crease that connects them. In the region where the surfaces of the top forming plates 11a, 12a, 13a, 14a are thermally bonded and the region where the surfaces of the bottom forming plates 11b, 12b, 13b, 14b are thermally bonded, a partial adhesion strength adjusting layer 8 is provided. And the adhesive strength adjustment layer 9 is formed. The printed pattern layer is formed in a region excluding the region to be thermally bonded on the surface of the blank plate.
[0017]
Adhesive strength adjusting layers 8 and 9 are ethylene-vinyl acetate copolymer, chlorinated ethylene-vinyl acetate copolymer, chlorinated polyethylene, chlorinated polypropylene, cyclized rubber, polyamide resin, urethane resin, acrylic resin, cellulose resin. The alkyd resin can be formed by printing using a simple substance of an alkyd resin or a mixture thereof, but it is most preferable to use an acrylic resin having a low melting point. The area for forming the adhesive strength adjusting layers 8 and 9 is 40 to 100% of the area where the surfaces of the top forming plates 11a, 12a, 13a and 14a and the bottom forming plates 11b, 12b, 13b and 14b are thermally bonded. It is preferable to do this.
[0018]
The blank plate shown in FIG. 3 is formed into a cylindrical shape by thermally bonding the side plate 11 and the adhesive plate 15, and the bottom portion forming plates 11b, 12b, 13b, 14b are bent and thermally bonded to form the bottom portion. The top portion forming plates 11a, 12a, 13a, and 14a are bent and thermally bonded to form the top portion, thereby obtaining a Gobel top container. When discarding the gobeltop container, the top surface forming plates 12a and 14a provided with the adhesive strength adjusting layer 8 are peeled off from the heat-bonded portions, and the bottom portion provided with the adhesive strength adjusting layer 9 is provided. After the portions of the forming plates 12b, 13b, and 14b where the surfaces are bonded to each other are peeled off, the top and bottom portions of the gobeltop type container are disassembled, and then the side plates 12 and 14 are folded at the folding line 16 at the center in the width direction. 5 and by folding the top forming plates 12a, 14a and the bottom forming plates 12b, 14b inward at the folding line 17 at the center in the width direction, respectively, as shown in FIG. it can.
[0019]
As shown in FIG. 4, the procedure for dismantling the bottom part of the gobeltop container by peeling the part where the surfaces of the bottom forming plates 12b, 13b, 14b provided with the adhesive strength adjusting layer 9 are thermally bonded is shown in FIG. From the state shown in FIG. 4 (a), the edge adhering portion 18 at the bottom is peeled off from the bottom forming plate 13b and is raised to the state shown in FIG. 4 (b). Next, the portions where the surfaces of the bottom forming plates 12b and 14b are thermally bonded are peeled off to separate the edge bonding portions 18, and the bottom forming plates 12b and 14b are folded after the state shown in FIG. 4 is folded at the bottom as shown in FIG. 4 (d), and the side plates 12 and 14 are folded inward at the folding line 16 at the center in the width direction, and the top forming plates 12a and 14a are widened. A folded state shown in FIG. 5 is obtained by bending inward at a folding line 17 at the center of the direction.
[0020]
In the folded state of the paper container shown in FIG. 5, the corners of the exposed end of the laminate of the side plate bonded to the bonding plate 15 of the rear plate 11, top forming plate 11a, and bottom forming plate 11b are exposed. Since the laminate can be peeled by bending the end portion, the peeling is started from the corner end portions of the top forming plate 11a and the bottom forming plate 11b as shown in FIG. By separating the entire length of the side end portions of the top forming plate 11a and the bottom forming plate 11b, the laminate can be separated into an outer surface layer and an inner surface layer. Also, as shown in FIG. 8, after peeling the adhesive portions between the outer surfaces of the top thermal bonding portion, the opposite corner portions are gripped and pulled in a diagonal direction, thereby creating a trigger for peeling, and the laminated body from the portion to the outer surface It can be separated into a layer and an inner layer.
[0021]
【Example】
Example 1
A 12μ biaxially stretched polyethylene terephthalate film, 7μ aluminum foil, and 60μ polyethylene film were laminated in this order by dry lamination using urethane adhesive, and the release layer ink having the following composition on the surface of the biaxially stretched polyethylene terephthalate film. Was used to form a release layer with a thickness of 1 μm to produce a laminated film.
[Composition of release layer ink (parts by weight)]
Polyester resin (Eritel VM-3600, Unitika) 20
MEK: toluene = 1: 1 (solvent) 80
Next, 30 μ polyethylene is laminated on one side of 400 g of paperboard by extrusion, and the other side of the paperboard and the release layer surface of the laminated film produced above are laminated by extrusion lamination of 25 μm thick polyethylene, A laminate composed of polyethylene 30 μ / paperboard 400 g / polyethylene 25 μ / release layer / biaxially stretched polyethylene terephthalate 12 μ / adhesive / aluminum foil 7 μ / adhesive / polyethylene film 60 μ was prepared.
The adhesive strength between the 25 μ polyethylene and the release layer in the obtained laminate was 40 g / 15 mm width, and had a practically no problem when used as a liquid paper container such as a Gobeltop type.
A printed pattern is formed on the polyethylene surface of 30 μm of the above laminate, and an adhesive strength adjusting layer is formed by printing in a predetermined region, and then a blank plate for a gobeltop container is produced by punching, and the blank plate is formed into a cylinder. A top part and a bottom part were formed by thermal bonding to produce a Gobeltop type container.
Peel off the laminated body from the corners of the folded container by peeling off the adhesion between the outer surfaces of the top and bottom of the gobbel-top container obtained above, then folding the container and folding the corners to loosen them. Thus, it was possible to separate the outer surface layer mainly composed of paper and the inner surface layer mainly composed of plastic.
[0022]
Example 2
Lamination was carried out in the same manner as in Example 1 except that a release layer having a thickness of 1 μm was formed on the surface of the biaxially stretched polyethylene terephthalate film using a release layer ink having the following composition: 30 μm polyethylene / 400 g paperboard / 25 μm polyethylene / A laminate comprising a release layer / biaxially stretched polyethylene terephthalate 12 μm / adhesive / aluminum foil 7 μm / adhesive / polyethylene film 60 μm was produced.
[Composition of release layer ink (parts by weight)]
Ethylene-vinyl acetate copolymer 10
(Evaflex 220, Mitsui DuPont Polychemical)
Toluene (solvent) 90
The adhesive strength between the release layer and the biaxially stretched polyethylene terephthalate film in the obtained laminate is 35 g / 15 mm width, and has an adhesive strength that causes no practical problems when used as a liquid paper container such as a Gobeltop type. It was.
Hereinafter, an outer surface layer mainly composed of paper is formed by folding a gobeltop type liquid paper container obtained in the same manner as in Example 1 and folding the corner ends to loosen the laminate from the corner ends. It could be separated into an inner layer mainly composed of plastic.
[0023]
Example 3
7μ aluminum foil, 12μ biaxially stretched polyethylene terephthalate film and 60μ polyethylene film were laminated in this order by dry lamination using urethane adhesive, and the release layer ink of the following composition was used on the aluminum foil surface. A release layer having a thickness of 1 μm is formed and laminated in the same manner as in Example 1. Polyethylene 30 μm / paperboard 400 g / polyethylene 25 μm / peeling layer / aluminum foil 7 μm / adhesive / biaxially stretched polyethylene terephthalate 12 μm / adhesive / A laminate composed of polyethylene film 60μ was prepared.
[Composition of release layer ink (parts by weight)]
Shellac (Lack Glaze 20E, Nippon Shellac Industry) 20
Ethanol (solvent) 80
In the obtained laminate, the adhesive strength between the 25 μ polyethylene layer and the release layer was 25 g / 15 mm width, and had a practically no problem when used as a liquid paper container such as a Gobeltop type.
Hereinafter, by folding a gobeltop type liquid paper container obtained in the same manner as in Example 1 and bending and loosening the corner ends, the laminate is peeled from the 25 μ polyethylene layer and the release layer from the corner ends. It was possible to separate into an outer surface layer mainly composed of and an inner surface layer mainly composed of plastic.
[0024]
Example 4
Lamination was carried out in the same manner as in Example 3 except that the release layer was formed to a thickness of 1 μm using the release layer ink having the following composition on the aluminum foil surface, and 30 μm of polyethylene / 400 g of paperboard / 25 μm of polyethylene / peeling layer / aluminum. A laminate consisting of 7 μm foil / adhesive / biaxially stretched polyethylene terephthalate 12 μm / adhesive / polyethylene film 60 μm was produced.
[Composition of release layer ink (parts by weight)]
Ethylene-vinyl acetate copolymer 10
(Evaflex 220, Mitsui DuPont Polychemical)
Toluene (solvent) 90
The adhesive strength between the release layer and the aluminum foil in the obtained laminate was 60 g / 15 mm width, and had an adhesive strength that had no practical problem when a liquid paper container such as a gobel top type was used. Hereinafter, by folding the gobeltop type liquid paper container obtained in the same manner as in Example 1 and folding the corner ends to loosen the laminate from the corner ends between the release layer and the aluminum foil , the paper It was possible to separate into an outer surface layer mainly composed of and an inner surface layer mainly composed of plastic.
[0025]
【The invention's effect】
A liquid paper container composed of a laminate in which a thermoplastic resin layer, a paper layer, an adhesive resin layer, a release layer, an intermediate base material layer, and a thermoplastic resin layer are laminated in order from the outer surface , and the laminate is exposed. The laminate can be peeled from the edge of the peeling layer at the interface of the peeling layer and separated into a paper-based outer surface layer and a plastic-based inner surface layer, so the paper-based outer surface layer is easy to reuse. At the same time, the inner surface layer mainly composed of plastic is less bulky and is easily discarded. In the above liquid paper container, since the intermediate base material layer is a plastic film or a plastic film having a gas barrier layer composed of an aluminum foil, an aluminum vapor deposition layer, a silicon oxide vapor deposition layer, and an aluminum oxide vapor deposition layer, alcohol, wine, coffee In addition, a liquid paper container suitable for packaging detergent and the like can be obtained. The shape of the liquid paper container is a Goebel top type consisting of 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 to each other. The adhesive strength adjusting layer is partially formed on the outer surface, so that the heat bonding portions on the outer surfaces of the top portion and the bottom portion are easily peeled off, the top portion and the bottom portion are disassembled, and the laminate is mainly composed of paper from the edge portion. The outer surface layer and the inner surface layer mainly composed of plastic can be easily separated. In the liquid paper container described above, the side plates are folded inward by forming a vertical folding line at the center of the top plate and the bottom plate connected to the top and bottom of the side plates and the side plates. It becomes easy to fold with.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a stacked structure according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a stacked structure according to a second embodiment of the present invention.
FIG. 3 is a plan view showing a state of the surface of a blank plate of a gobble top type container.
FIG. 4 is a partial perspective view showing a procedure for peeling and disassembling the adhesive portions on the outer surfaces of the bottom forming plate of the gobbel top type container.
FIG. 5 is a perspective view showing a folded state of the gobeltop type container.
FIG. 6 is a perspective view showing a state in which a laminate is peeled from an end portion of a container into an outer surface layer and an inner surface layer.
FIG. 7 is a perspective view showing a state in which the outer surface layer is peeled over the entire length of the container.
FIG. 8 is a perspective view showing another method for creating a trigger for peeling the outer surface layer and the inner surface layer.
[Explanation of symbols]
1,7 Polyethylene layer 2 Paper layer 3 Adhesive resin layer 4 Release layer 5 Plastic film layer 6 Gas barrier layer 8, 9 Adhesive strength adjustment layer
11, 12, 13, 14 Side plate
11a, 12a, 13a, 14a Top plate
11b, 12b, 13b, 14b Bottom forming plate
15 Adhesive plate
16, 17 Folded line
18 Bottom edge bond

Claims (4)

From the outer surface, the thermoplastic resin layer, paper layer, adhesive resin layer, release layer, polyethylene terephthalate film, nylon film, or polypropylene film plastic film, or aluminum vapor deposition layer, silicon oxide vapor deposition layer, aluminum oxide vapor deposition layer comprising a liquid packaging cartons made from a laminate and the intermediate base layer made of plastic film and a thermoplastic resin layer is laminated with a gas barrier layer, the plastic film arm is directly laminated with the peeling layer The release layer is formed from a resin selected from the group consisting of a polyester resin, a mixture of an acrylic resin and a polyester resin, and a urethane resin, the adhesive resin layer is made of a polyolefin resin, and the adhesive resin layer and the release layer Interfacial adhesive strength is 10-100g / 15m The release layer is formed from a resin selected from the group consisting of ethylene-vinyl acetate copolymer, butyral resin, and vinyl chloride-vinyl acetate copolymer, and the adhesive resin layer is made of polyolefin resin. becomes, the adhesive strength of the interface between the plastic film arm of the release layer and the intermediate base layer is 10 to 100 g / 15 mm width, from the edge which is exposed in the laminate, the interface between the release layer A liquid paper container, wherein the laminate can be separated into an outer surface layer mainly composed of paper and an inner surface layer mainly composed of plastic. An intermediate base material layer made of a plastic film having a gas barrier layer made up of a thermoplastic resin layer, a paper layer, an adhesive resin layer, a release layer, an aluminum foil, an aluminum vapor deposition layer, a silicon oxide vapor deposition layer, and an aluminum oxide vapor deposition layer in order from the outer surface a liquid packaging cartons made from a laminate and the thermoplastic resin layer are laminated, before SL gas barrier layer is laminated directly to said release layer, said release layer is shellac, polyamide resin, polyester resin, vinyl chloride -Formed from a resin selected from the group consisting of vinyl acetate copolymer, butyral resin and acrylic resin, the adhesive resin layer is made of polyolefin resin, and the adhesive strength at the interface between the adhesive resin layer and the release layer is 10 ˜100 g / 15 mm width, or the release layer is formed from an ethylene-vinyl acetate copolymer, Chakujushi layer comprises a polyolefin resin, edge bonding strength of the interface between the pre-SL gas barrier layer of the release layer and the intermediate base layer is 10 to 100 g / 15 mm width, exposed of the laminate The liquid sheet container is further characterized in that the laminate can be separated at the interface of the release layer and separated into an outer surface layer mainly composed of paper and an inner surface layer mainly composed of plastic.   The shape of the liquid paper container according to claim 1 or 2 is a Gobel top type comprising a front plate, a rear plate, both side plates, a top forming plate, and a bottom forming plate, wherein the top forming plate and the bottom forming plate A liquid paper container, wherein an adhesion strength adjusting layer is partially formed in a region where the outer surfaces are thermally bonded.   4. The liquid paper container according to claim 3, wherein a vertical folding line is formed at the center part of the top part forming plate and the bottom part forming plate connected to the upper and lower sides of the both side surface plates and the both side surface plates, respectively. And liquid paper container.

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