JP4220031B2 - Liquid paper container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid paper container used for packaging of alcohol, wine, coffee, etc., in which an aluminum vapor deposition layer is used as a gas barrier layer, and a liquid paper container having a structure in which adhesion between layers of a laminate constituting the container is stabilized. About.
[0002]
[Prior art]
Conventionally, as a laminate used for a liquid paper container having a structure in which an aluminum foil is not used as a gas barrier layer, a laminate composed of polyethylene / paper / adhesive resin / aluminum deposition layer / biaxially stretched polyethylene terephthalate / adhesive / polyethylene is used. The body is used. And the process of manufacturing the laminated body of said structure WHEREIN: The surface without the vapor deposition layer of the biaxial stretching polyethylene terephthalate in which the aluminum vapor deposition layer was formed, and a polyethylene film are laminated | stacked by dry lamination or extrusion lamination using an adhesive agent. Then, a laminated film composed of an aluminum vapor deposition layer / biaxially stretched polyethylene terephthalate / adhesive / polyethylene is prepared, and then the aluminum vapor deposition layer surface of the laminated film produced above and paper are laminated with an adhesive resin at the same time. The method is generally performed by laminating polyethylene on the opposite side of the paper.
[0003]
In the above manufacturing process, when a laminated film made of aluminum vapor deposition layer / biaxially stretched polyethylene terephthalate / adhesive / polyethylene is prepared in advance and wound into a roll and stored, the aluminum vapor deposition layer surface and the polyethylene surface come into contact with each other. Therefore, the adhesion between the aluminum vapor deposition layer surface and the adhesive resin layer when the aluminum vapor deposition layer surface of the laminated film and paper are laminated with an adhesive resin because the aluminum vapor deposition layer surface is contaminated by low molecular weight materials in polyethylene, etc. There was a problem that became unstable.
[0004]
In order to solve this problem, it is necessary to perform a corona treatment on the aluminum vapor deposition layer surface to remove contaminants on the aluminum vapor deposition layer surface immediately before laminating the aluminum vapor deposition layer surface and paper with an adhesive resin. However, there is a drawback that the uniformity of the aluminum vapor deposition layer is impaired by performing the above, and the gas barrier property and water vapor barrier property of the aluminum vapor deposition layer are remarkably impaired.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to stabilize the adhesive strength between the aluminum vapor deposition layer surface and the adhesive resin layer in a paper container made of a laminate using an aluminum vapor deposition layer as a gas barrier layer, and facilitate disposal after use. It is to provide a liquid paper container.
[0006]
[Means for Solving the Problems]
A thermoplastic resin layer, a paper layer, an adhesive resin layer, an adhesive stabilizing resin layer, an aluminum vapor deposition layer, a plastic film layer, an adhesive layer, and a thermoplastic resin layer are laminated in order from the outer surface, and the adhesive stabilizing resin layer is In a step different from the step of forming the first layer located on the aluminum vapor deposition layer side and the second layer located on the side of the adhesive resin layer, the step of laminating the adhesive resin layer on the surface of the adhesion stabilizing resin layer, In a liquid paper container composed of a laminate in which the first layer and the second layer are sequentially formed on the aluminum vapor deposition layer surface, the first layer is made of shellac and the second layer is made of ethylene-vinyl acetate. It is composed of any one of a coalesced resin, a butyral resin, or an EVA-modified urethane resin, or a structure in which the first layer is made of a polyamide resin and the second layer is made of a cellulose resin. It is thereby possible to vapor-deposited aluminum layer and the adhesive liquid paper container obtained by the stabilization of the adhesive resin layer. Moreover, since the aluminum foil is not used, the used paper container can be easily discarded.
[0007]
In the liquid paper container described above, the thermoplastic resin has a structure in which the adhesive stabilizing resin layer is formed on the aluminum vapor deposition layer surface in a separate process from the process of laminating the adhesive resin layer on the adhesive stabilizing resin layer surface. In the production of a laminate in which a resin layer, a paper layer, an adhesive resin layer, an adhesion stabilizing resin layer, an aluminum vapor deposition layer, a plastic film layer, an adhesive layer, and a thermoplastic resin layer were produced, an aluminum vapor deposition layer was formed. When a laminated film of a biaxially stretched plastic film layer, an adhesive layer and a thermoplastic resin layer is prepared in advance and wound into a roll and stored, the adhesion stabilizing resin layer is formed on the aluminum vapor deposition layer surface In addition, it is not contaminated by low molecular weight substances in the thermoplastic resin layer, and the adhesion between the aluminum vapor deposition layer surface and the adhesive resin layer can be stabilized.
[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 a configuration of a laminate according to an embodiment of the present invention, FIG. 2 is a plan view showing a blank plate of the gobble-top type container of the embodiment, 1, 8 is a polyethylene layer, and 2 is a paper layer 3 is an adhesive resin layer, 4 is an adhesive stabilizing resin layer, 5 is an aluminum vapor deposition layer, 6 is a plastic film layer, 7 is an adhesive layer, 11, 12, 13, and 14 are side plates, 11a, 12a, 13a, 14a represents a top forming plate, 11b, 12b, 13b, and 14b represent bottom forming plates, 15 represents an adhesive plate, and 16 and 17 represent folding curves.
[0009]
As shown in FIG. 1, the laminated body used in the embodiment of the liquid paper container of the present invention has a polyethylene layer 1, a paper layer 2, an adhesive resin layer 3, an adhesive stabilizing resin layer 4, and aluminum vapor deposition in order from the outer surface. The layer 5, the plastic film layer 6, the adhesive layer 7, and the polyethylene layer 8 are laminated. With this laminated structure, when the laminate is manufactured, the surface of the plastic film layer 6 on which the aluminum vapor-deposited layer 5 is formed and the polyethylene layer 8 are bonded with the adhesive layer 7. When the laminated film is prepared in advance and wound into a roll and stored, the adhesion stabilizing resin layer 4 is formed on the surface of the aluminum vapor-deposited layer 5, so that it is contaminated by low molecular weight materials in the polyethylene layer 8 and the like. Thus, the adhesion between the aluminum vapor deposition layer 5 surface and the adhesive resin layer 3 can be stabilized. The shape of the liquid paper container produced by the laminate shown in FIG. 1 is arbitrary such as a gobel top type or a brick type.
[0010]
As the adhesion stabilizing resin layer 4, shellac, butyral resin, urethane resin, cellulose resin, polyamide resin, ethylene-vinyl acetate copolymer resin, EVA- modified urethane resin, vinyl chloride-vinyl acetate copolymer resin Can be used alone or as a mixture. The adhesion stabilizing resin layer 4 may be formed in two layers using the different resins described above. As a combination in the case of forming two layers, the first layer formed on the surface of the aluminum vapor deposition layer 5 is shellac: the second layer formed thereon is an ethylene-vinyl acetate copolymer, and the first layer is shellac: second. The layer is butyral, the first layer is shellac: the second layer is EVA- modified urethane, the first layer is polyamide: the second layer is cellulose acetate, and the like. The adhesion stabilizing resin layer 4 is formed by applying a solution or aqueous emulsion made of the above resin to the surface of the aluminum vapor-deposited layer 5 by gravure printing or coating. A coating amount of 1 to 3 g / m ² is appropriate.
[0011]
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 8. Is done. As the paper layer 2, a paperboard having a basis weight of 250 to 450 g / m ² is used. The adhesive resin layer 3 includes low density polyethylene, ionomer, ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl acrylate copolymer (EMA), ethylene-acrylic. An ethyl acid copolymer (EEA), an ethylene-methyl methacrylate copolymer (EMMA), or the like is used. As the plastic film layer 6, biaxially stretched polyethylene terephthalate, biaxially stretched nylon or the like is used. As the adhesive layer 7, a urethane-based adhesive is used.
[0012]
In the embodiment of the present invention, as shown in FIG. 2, the blank plate of the bell-top type has side plates 11, 12, 13, 14 and an adhesive plate 15 connected to each other via a crease, and side plates 11, The top forming plates 11a, 12a, 13a, 14a and the bottom forming plates 11b, 12b, 13b, 14b are connected to the upper and lower edges of the 12, 13, 14 via creases, respectively. Folding lines 16 are vertically arranged at the center, and folding lines 17 are respectively arranged at the center of the top forming plates 12a, 14a and bottom forming plates 12b, 14b, and side plates 11, 12, 13, 14, and so on. The top portion forming plates 11a, 12a, 13a, and 14a or the bottom portion forming plates 11b, 12b, 13b, and 14b are formed in a shape that excludes the upper and lower predetermined dimensions of the folded ruled line. The printed pattern is formed in a region excluding the region to be thermally bonded on the surface of the blank plate.
[0013]
The blank plate shown in FIG. 2 is formed into a cylindrical shape by thermally bonding the side plate 11 and the adhesive plate 15, and the bottom portion is formed by bending the bottom portion forming plates 11b, 12b, 13b, and 14b and thermally bonding them. 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 disposing of the gobeltop container, disassemble the top and bottom of the gobeltop container, then fold the side plates 12 and 14 inwardly at the folding line 16 at the center in the width direction and form the top. The plates 12a and 14a and the bottom forming plates 12b and 14b can be folded inwardly at the folding line 17 at the center in the width direction.
[0014]
【Example】
Example 1
A coating solution made of EVA- modified urethane resin (Samprene, Sanyo Chemical Industries) is printed on the entire surface of the 12μ biaxially stretched polyethylene terephthalate film on which the aluminum deposition layer has been formed by gravure printing and bonded to a thickness of 2μ. A stabilizing resin layer was formed. A 50 μm polyethylene film was laminated on the polyethylene terephthalate surface of this film using a urethane-based adhesive, and wound into a roll to produce a laminated film. The prepared laminated film was allowed to stand for 3 days in the state of being wound up in a roll shape, and then the EVA- modified urethane resin surface of the laminated film and one side of 400 g of paperboard were laminated by extrusion of 20 μ polyethylene, and the other side of the paperboard was laminated. By laminating polyethylene with a thickness of 25 μm on the surface by extrusion lamination, polyethylene 25 μm / paperboard 400 g / polyethylene 20 μm / EVA modified urethane resin / aluminum vapor-deposited layer / biaxially stretched polyethylene terephthalate 12 μm / urethane adhesive / polyethylene 50 μm A laminate for a liquid paper container was prepared. Adhesion between 20 μm polyethylene laminated with an EVA- modified urethane resin in this laminate and an aluminum deposition layer was good, and a good liquid paper container could be obtained.
[0015]
Example 2
As in Example 1, except that a coating liquid composed of a vinyl chloride-vinyl acetate copolymer (vinylite, union carbide) was printed on the entire surface by gravure printing to form a 2 μm thickness as the adhesion stabilizing resin layer. went.
Adhesion between the 20 μm polyethylene laminated with the vinyl chloride-vinyl acetate copolymer resin and the aluminum vapor deposition layer in this laminate was good, and a good liquid paper container could be obtained.
[0016]
Example 3
The adhesion stabilization resin layer is formed to a thickness of 0.5μ using the shellac resin (Rack Glaze 20E, Nippon Shellac Industries) as the first layer, and the butyral resin (petital, Sekisui resin) as the second layer. Then, the same procedure as in Example 1 was performed except that the layer was formed to a thickness of 1.5 μm to form two layers.
Adhesion between the 20 μm polyethylene laminated through the shellac resin layer and the butyral resin layer and the aluminum deposition layer in this laminate was good, and a good liquid paper container could be obtained.
[0017]
【The invention's effect】
A thermoplastic resin layer, a paper layer, an adhesive resin layer, an adhesive stabilizing resin layer, an aluminum vapor deposition layer, a plastic film layer, an adhesive layer, and a thermoplastic resin layer are laminated in order from the outer surface, and the adhesive stabilizing resin layer is In a step different from the step of forming the first layer located on the aluminum vapor deposition layer side and the second layer located on the side of the adhesive resin layer, the step of laminating the adhesive resin layer on the surface of the adhesion stabilizing resin layer, In a liquid paper container composed of a laminate in which the first layer and the second layer are sequentially formed on the aluminum vapor deposition layer surface, the first layer is made of shellac and the second layer is made of ethylene-vinyl acetate. It is composed of any one of a coalesced resin, a butyral resin, or an EVA-modified urethane resin, or a structure in which the first layer is made of a polyamide resin and the second layer is made of a cellulose resin. It is thereby possible to vapor-deposited aluminum layer and the adhesive liquid paper container obtained by the stabilization of the adhesive resin layer. Moreover, since the aluminum foil is not used, the used paper container can be easily discarded. In the liquid paper container described above, the adhesive stabilizing resin layer is formed in advance on the aluminum vapor deposition layer surface in a separate process from the process of laminating the adhesive resin layer on the adhesion stabilizing resin layer surface. In the production of a laminate in which a resin layer, a paper layer, an adhesive resin layer, an adhesion stabilizing resin layer, an aluminum vapor deposition layer, a plastic film layer, an adhesive layer, and a thermoplastic resin layer were produced, an aluminum vapor deposition layer was formed. When a laminated film of a biaxially stretched plastic film layer, an adhesive layer and a thermoplastic resin layer is prepared in advance and wound into a roll and stored, the adhesion stabilizing resin layer is formed on the aluminum vapor deposition layer surface In addition, it is not contaminated by low molecular weight substances in the thermoplastic resin layer, and the adhesion between the aluminum vapor deposition layer surface and the adhesive resin layer can be stabilized.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a laminate according to an embodiment of the present invention.
FIG. 2 is a plan view showing a blank plate of the gobble top container according to the embodiment.
[Explanation of symbols]
1,8 Polyethylene layer 2 Paper layer 3 Adhesive resin layer 4 Adhesive stabilization resin layer 5 Aluminum vapor deposition layer 6 Plastic film layer 7 Adhesive 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

Claims (1)

A thermoplastic resin layer, a paper layer, an adhesive resin layer, an adhesive stabilizing resin layer, an aluminum vapor deposition layer, a plastic film layer, an adhesive layer, and a thermoplastic resin layer are laminated in order from the outer surface, and the adhesive stabilizing resin layer is In a step different from the step of forming the first layer located on the aluminum vapor deposition layer side and the second layer located on the side of the adhesive resin layer, the step of laminating the adhesive resin layer on the surface of the adhesion stabilizing resin layer, In a liquid paper container composed of a laminate in which the first layer and the second layer are sequentially formed on the aluminum vapor deposition layer surface, the first layer is made of shellac and the second layer is made of ethylene-vinyl acetate. it is no coalescence resin or butyral resin comprising any one of the EVA-modified urethane resin, or, especially that the first layer and the second layer consists of polyamide-based resin is a cellulose-based resin Liquid paper container to be.

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