JP2003063520A - Gas barrier paper cup - Google Patents

Abstract

(57) [Problem] An object of the present invention is to prevent a fragrance component or the like from migrating into a paper cup and adsorbing on the content stored in the paper cup to alter the content. It is to provide a possible gas barrier paper cup. SOLUTION: In a gas barrier paper cup comprising a laminate having a paperboard layer, a polyethylene layer, an ethylene-vinyl alcohol copolymer layer and a polyethylene layer, the laminate has a polyethylene layer, an adhesive layer, and a thickness in the paperboard layer. 3 ~
This is a gas-barrier paper cup having a structure in which a co-extruded film composed of a 5-μm ethylene-vinyl alcohol copolymer layer, an adhesive layer and a polyethylene layer is laminated by extrusion lamination of polyethylene.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper cup having an excellent gas barrier property in which an external odor does not transfer to a product housed inside.

[0002]

2. Description of the Related Art Conventionally, a paper cup is usually composed of a body member and a bottom member made of a laminated body of paperboard and polyethylene, and the contents such as instant noodles are stored in a lid of the paper cup of this structure. If there is a case where the material is heat-bonded and attached to form a package, and the package is displayed near the air freshener package or the like for sale, the paper cup of this configuration has a poor gas barrier property. The fragrance component leaking from the fragrance package penetrates the paper cup and moves to the inside, and is absorbed by the contents stored inside, so the taste of the contents such as instant noodles changes. There was a drawback that the product value was lost.

Further, as a gas barrier paper cup capable of preventing fragrance components and the like from moving inside and adsorbing to the contents, a paper cup having a body member and a bottom member made of a laminate containing aluminum foil, It is known that the body member and the bottom member are composed of a laminate of a paper layer and an ethylene-vinyl alcohol copolymer layer (Jitsukaihei 5-68817). However, since the former paper cup contains aluminum foil in the laminate forming the body member and the bottom member, there is a problem in disposal of the paper cup after use, and the aluminum foil is expensive, resulting in high cost. There is a problem. In the latter case where the body member and the bottom member are made of a laminate of a paper layer and an ethylene-vinyl alcohol copolymer layer, the thickness of the ethylene-vinyl alcohol copolymer layer is 2
There is a problem that the thickness is as thick as 0 to 40 μm and the cost becomes high.

[0004]

DISCLOSURE OF THE INVENTION An object of the present invention is to modify the contents when they are sold at a store, when the fragrance component or the like moves into the inside of the paper cup and is adsorbed to the contents stored in the paper cup. It is an object of the present invention to provide a paper cup having an excellent gas barrier property that does not cause it.

[0005]

A gas barrier paper cup comprising a laminate having a paperboard layer, a polyethylene layer, an ethylene-vinyl alcohol copolymer layer, and a polyethylene layer, wherein the laminate has an ethylene-vinyl alcohol copolymer on the paperboard layer. This gas barrier paper cup is produced by laminating a coextruded film containing a polymer layer by extrusion lamination of polyethylene and making the thickness of the ethylene-vinyl alcohol copolymer layer 3 to 5 μm. Even when a product containing instant noodles is displayed near the air freshener packaging and sold, the air freshener components leaking from the air freshener packaging penetrate the paper cup and move inside. There is no fragrance, so the contents such as instant ramen stored in the paper cup will be absorbed by the fragrance component. From being deteriorated can be reliably prevented. Further, since the thickness of the ethylene-vinyl alcohol copolymer layer is as thin as 3 to 5 μm, the cost can be reduced, and the laminate can be prepared only by laminating the coextruded film on the paperboard by polyethylene extrusion lamination. The body manufacturing process can be simplified.

In the above gas barrier paper cup,
The co-extruded film consists of polyethylene layer, adhesive layer and ethylene-
By comprising a vinyl alcohol copolymer layer, an adhesive layer and a polyethylene layer, it is possible to improve the adhesion between the paperboard layer and the coextruded film when laminating the coextruded film on the paperboard layer by extrusion lamination of polyethylene. it can. Further, since the coextruded film has a constitution in which the ethylene-vinyl alcohol copolymer layer is covered with the polyethylene layer, gas barrier property due to moisture absorption of the ethylene-vinyl alcohol copolymer layer during storage of the coextruded film. Can be prevented.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the structure of a laminated body of the embodiment, 2 is a body portion, 3 is a bottom portion, 4 is an outward curl portion, and 5 is a bottom adhesive. Parts, 11 is a paperboard layer, 12 is an extruded polyethylene layer, 13 is a coextruded film, 14 and 18 are linear low density polyethylene layers, 1
5, 17 is an adhesive layer, 16 is an ethylene-vinyl alcohol copolymer layer, and 19 is a pattern layer.

The embodiment of the present invention is a gas barrier paper cup having the structure shown in FIG. 1, which is made of a fan-shaped body member and a circular bottom member made of the laminated body having the structure shown in FIG. As shown in FIG. 1, a body part 2 is formed by winding a fan-shaped body member into an inverted truncated cone shape, and an outward curl formed by curling the upper end edge of the inverted frustoconical shape. It is formed by fitting the portion 4 and the bent portion obtained by bending the lower end edge of the body portion 2 inwardly into the bent portion obtained by bending the peripheral edge portion of the circular bottom member downward, and adhering it at the bottom adhesive portion 5. It is a paper cup having a shape having a closed bottom portion 3.

The laminate for producing the gas barrier paper cup of the embodiment is as shown in FIG. 2, in which the pattern layer 19, the paperboard layer 11, the extruded polyethylene layer 12 and the coextruded film 13 are laminated in order from the outer surface. The coextruded film 13 has a structure in which a linear low-density polyethylene layer 14, an adhesive layer 15, an ethylene-vinyl alcohol copolymer layer 16, an adhesive layer 17, and a linear low-density polyethylene layer 18 are laminated. ing.
The laminate of the embodiment has a linear low-density polyethylene layer 14, an adhesive layer 15, and an ethylene-vinyl alcohol copolymer layer 16 on the surface of the paperboard layer 11 on which the pattern layer 19 is formed by printing, on which the pattern layer 19 is not formed. And adhesive layer 17 and linear low density polyethylene layer
The coextruded film 13 consisting of 18 is the extruded polyethylene layer 12
It is produced by stacking the layers.
The thickness of the ethylene-vinyl alcohol copolymer layer 16 of the coextrusion film 13 is 3 to 5 μm.

The laminate for producing the gas barrier paper cup of the embodiment is prepared by extruding polyethylene onto the paperboard 11 to form a linear low density polyethylene layer 14, an adhesive layer 15, an ethylene-vinyl alcohol copolymer layer 16 and an adhesive layer. Coextrusion film 13 consisting of 17 and linear low density polyethylene layer 13
By laminating and producing a laminate, a laminate is produced using a general-purpose extrusion laminator, as compared with a production process in which a laminate is produced by coextrusion lamination including an ethylene-vinyl alcohol copolymer layer on a paperboard. Therefore, it becomes possible to simplify the manufacturing process of the laminate, and if the coextruded film 13 is stored, the paperboard 11 and the coextruded film 13 can be laminated by extrusion lamination of polyethylene if necessary. The laminated body can be easily manufactured by the method. Further, by using the coextruded film 13, the thickness of the ethylene-vinyl alcohol copolymer layer 16 is 3 to
It becomes possible to reduce the thickness to 5 μm.

By forming the coextruded film 13 from the linear low density polyethylene layer 14, the adhesive layer 15, the ethylene-vinyl alcohol copolymer layer 16, the adhesive layer 17 and the linear low density polyethylene layer 18, Since the inner and outer surfaces of the coextruded film 13 are the linear low-density polyethylene layers 14 and 18, excellent thermal adhesive strength can be obtained when producing a gas barrier paper cup, and the coextruded film 13 is formed by extrusion lamination of polyethylene. Can be laminated to paperboard. The thickness of each layer of the coextrusion film 13 is 4 to 6 μm for the linear low density polyethylene layer 14 and 3 to 4 μm for the adhesive layers 15 and 17.
m, ethylene-vinyl alcohol copolymer layer 16 is 3 to 5
The thickness of the linear low-density polyethylene layer 18 is 27 to 33 μm, and the thickness of the coextruded film 13 is preferably 40 to 50 μm. As the coextruded film having the above structure, JMB004BS manufactured by Dainippon Resin Co., Ltd., manufactured by Tohcello, or the like can be used. In addition, polyethylene may be laminated on the inner surface of the coextrusion film in order to stabilize the thermal adhesive strength when the paper cup is manufactured. By setting the thickness of the ethylene-vinyl alcohol copolymer layer to 3 to 5 μm, a gas barrier paper cup of the embodiment is packaged with instant noodles or the like, and is used together with an aromatic agent package or the like in a drug store or the like. Even when it is sold, it is possible to reliably prevent the leaked fragrance component and the like from moving into the gas barrier paper cup and adsorbing to the contents such as instant noodles.

In order to manufacture the laminate of the first embodiment, after a predetermined pattern layer 16 is formed on the paperboard layer 11 by gravure printing or the like, a linear low layer is formed on the surface of the paperboard on which the pattern layer 16 is not formed. Laminating a coextruded film 13 consisting of a density polyethylene layer 14, an adhesive layer 15, an ethylene-vinyl alcohol copolymer layer 16, an adhesive layer 17 and a linear low density polyethylene layer 18 by extrusion lamination of polyethylene is very simple. The body can be made. The obtained laminated body is punched into a fan-shaped body member and a circular-shaped bottom member, and processed with a paper cup manufacturing machine so that the paperboard layer 11 becomes the outer surface, thereby producing the gas barrier paper cup shown in FIG. Can be made.

The structure of the laminate for producing the gas barrier paper cup of the embodiment is as follows: picture layer / cup base paper 300 g / polyethylene 20 μm / coextrusion film 45
μm, picture layer / cup base paper 300g / polyethylene 20
μm / Coextruded film 45 μm / Polyethylene 20 μm
Etc. The structure of the lid member attached to the gas barrier paper cup of the present invention is as follows: 79 g of art paper / 20 μm of polyethylene / 7 μm of aluminum foil / 20 μm of polyethylene
m / heat-adhesive resin layer 20 μm or the like, and it is necessary to provide a lid material having excellent gas barrier properties.

[0014]

In a gas barrier paper cup comprising a laminate having a paperboard layer, a polyethylene layer, an ethylene-vinyl alcohol copolymer layer and a polyethylene layer, the laminate has an ethylene-vinyl alcohol copolymer layer as the paperboard layer. A co-extruded film containing the same is laminated by extrusion lamination of polyethylene, and the ethylene-vinyl alcohol copolymer layer has a thickness of 3 to 5 μm. Even when the stored product is displayed near the air freshener package and sold, the air freshener components leaking from the air freshener package do not penetrate through the paper cup and move inside. , The contents such as instant noodles stored in the paper cup are adsorbed by the fragrance agent and the contents are altered It is possible to reliably prevented. The thickness of the ethylene-vinyl alcohol copolymer layer is 3
Since the thickness is as thin as -5 μm, the cost can be reduced, and the laminated body can be produced only by laminating the coextruded film on the paperboard by extrusion lamination of polyethylene, so that the manufacturing process of the laminated body can be simplified.

In the above gas barrier paper cup,
The co-extruded film consists of polyethylene layer, adhesive layer and ethylene-
By comprising a vinyl alcohol copolymer layer, an adhesive layer and a polyethylene layer, it is possible to improve the adhesion between the paperboard layer and the coextruded film when laminating the coextruded film on the paperboard layer by extrusion lamination of polyethylene. it can. Further, since the coextruded film has a constitution in which the ethylene-vinyl alcohol copolymer layer is covered with the polyethylene layer, gas barrier property due to moisture absorption of the ethylene-vinyl alcohol copolymer layer during storage of the coextruded film. Can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the configuration of the laminated body of the embodiment.

[Explanation of symbols]

2 torso 3 bottom 4 outward curl 5 Bottom adhesive part 10 Coextrusion film 11 Paperboard layer 12 Extruded polyethylene layer 13 Coextrusion film 14, 18 Linear low density polyethylene layer 15, 17 Adhesive layer 16 Ethylene-vinyl alcohol copolymer layer 19 picture layer

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3E086 AD06 BA04 BA14 BA15 BB01                       BB15 CA01 CA03                 4F100 AK04B AK04C AK69C AL01C                       AL05C BA03 BA07 BA10A                       BA10C CB00 DA01 DG10A                       EH20 EH23 GB16 JD02 YY00C

Claims (2)

[Claims] 1. A gas barrier paper cup comprising a laminate having a paperboard layer, a polyethylene layer, an ethylene-vinyl alcohol copolymer layer and a polyethylene layer, wherein the laminate has an ethylene-vinyl alcohol copolymer layer on the paperboard layer. A gas barrier paper cup, characterized in that it is made by laminating a coextruded film containing polyethylene by extrusion lamination, and has an ethylene-vinyl alcohol copolymer layer having a thickness of 3 to 5 μm. 2. The gas barrier paper cup according to claim 1, wherein the coextruded film comprises a polyethylene layer, an adhesive layer, an ethylene-vinyl alcohol copolymer layer, an adhesive layer and a polyethylene layer.