JPH0761440A - Container for liquid - Google Patents

Abstract

PURPOSE:To use plastic film, highly barrier to water vapor, instead of aluminum foil that is incorporated in a laminated sheet used for paper containers for highly penetrative liquid such as liquor, or articles such as toiletry that stay for relatively long time in a distribution system and penetrative through paper while requiring barrier capacity because of its problematic property regarding disposal as wastes. CONSTITUTION:A container for liquid is constructed of a laminated sheet that is made up by providing a polyolefine layer 2 to the outside surface of a paper layer 1, and by sticking a stretched high density polyethylene film 3 to the inside of the paper layer 1 with an adhesive layer and by sticking furthermore a polyolefine layer 6 to the stretched high density polyethylene film 3 with an adhesive layer 5 and is constructed by adding a layer of polyolefine film 9 that contains a biaxially stretched polyester film 7 and carbon black to the inside of the layer.

Description

Detailed Description of the Invention

[0001]

The present invention relates to milk, juice, liquor,
Other than wine, etc., relates to liquid containers such as shampoo, rinse, liquid detergent, etc., but especially for sake, wine, etc., which are contents that circulate at room temperature for a long time, penetrate into paper, and require barrier properties. Used for.

[0002]

2. Description of the Related Art Conventionally, a laminated sheet obtained by laminating paper and polyethylene has been used as a liquid container. For example, for milk and juice, a laminated sheet having a constitution of polyethylene / paper / polyethylene is used. Products such as strong penetrating liquids, shampoos, rinses, liquid detergents, etc. that stay in the distribution for a relatively long period of time until they reach the hands of consumers and easily penetrate paper and require barrier properties. For polyethylene / paper / polyethylene / aluminum /
A laminated sheet having a structure of biaxially stretched polyethylene terephthalate / polyethylene is used.

[0003]

The container of a laminated sheet laminated with aluminum foil has good water vapor barrier property, gas barrier property and light shielding property, but has a problem in waste disposal after use. A sheet laminated with aluminum foil has drawbacks that it remains as ash even if it is incinerated after use, and if it is mixed with pulp at the time of papermaking for the purpose of recycling used paper, the quality of the recycled product deteriorates.

An object of the present invention is to provide a liquid paper container having a high water vapor barrier property without using the aluminum foil having the above-mentioned drawbacks.

[0005]

In order to solve the above-mentioned problems, the liquid container of the present invention comprises a paper layer, a stretched high-density polyethylene film laminated inside the paper layer, and a polyolefin layer formed thereon. And a liquid container formed from a sheet having a polyolefin layer on the outside of the paper layer. And the stretched high-density polyethylene film,
The above-mentioned liquid container, wherein a biaxially stretched polyester film is interposed between the polyolefin layer and the above-mentioned polyolefin layer. Further, the liquid container described above, characterized in that a polyolefin film containing carbon black is interposed between the paper layer and the stretched high-density polyethylene film.

The liquid container of the present invention can be provided with a high water vapor barrier property by laminating a stretched high density polyethylene film on the inner surface of the paper layer. The stretched high-density polyethylene film is a film that has a high water vapor barrier property in proportion to its thickness, does not generate toxic gas even when incinerated, and is a good material from the environmental aspect.

Specifically, as shown in FIG. 1, a polyolefin layer 2 is provided on the outer surface of the paper layer 1, and a stretched high-density polyethylene film 3 is provided on the inner surface side of the paper layer 1. The high-density polyethylene film 3 is laminated with an adhesive layer 4, and the polyolefin layer 6 on the inner surface side is further laminated with an adhesive layer 5. FIG. 2 shows a structure in which a biaxially stretched polyester film 7 is added to the structure of FIG. 1 in order to increase the strength. The paper layer 1 has a polyolefin layer 2 on the outer surface, and the inner surface side of the paper layer 1 The paper layer 1 and the stretched high-density polyethylene film 3 are bonded together with the adhesive layer 4, and the biaxially stretched polyester film 7 is laminated on the inner surface side of the stretched high-density polyethylene film 3 with the adhesive layer 8 interposed between them. In this structure, the polyolefin layer 6 is adhered to the adhesive layer 5 via the adhesive layer 5. Further, as shown in FIG. 3 in order to impart a light-shielding property, in addition to the structure of FIG. 2, a polyolefin film 9 containing carbon black is provided on the inner surface side of the paper layer 1 together with the paper layer 1 and a stretched high-density polyethylene. The film 3 and the film 3 are bonded and laminated by the adhesive layers 10 and 11.

The above-mentioned stretched high-density polyethylene film 3
Is a polyethylene film having a density of 0.935 or more and stretched at least in the axial direction and heat-fixed, and has a thickness of 10
.About.50 .mu. Is suitable. The basis weight of the paper layer 1 is 100
˜500 g / m ² is suitable, and the thickness of the biaxially stretched polyester film 7 is preferably 7 to 25 μm. The polyolefin layers 2 and 6 laminated on the outer surface side and the inner surface side of the paper layer 1 are polyethylene having a density of 0.88 to 0.95 or a copolymer of ethylene and α-olefin, ethylene and vinyl acetate, acrylic acid, acrylic acid. It is a copolymer with an ester, methacrylic acid, a methacrylic acid ester, etc., a polypropylene, a copolymer with polypropylene and ethylene, and a copolymer with polypropylene and butene-1. The outermost polyolefin layer 2 of the paper layer 1 has a thickness of 10 to 50 μ, and the outermost polyolefin layer 6 of the paper layer 1 has a thickness of 50 to 150 μ. The adhesive layers 4, 5, 8, 10, and 11 are composed of an adhesive such as vinyl acetate and urethane, an anchor coating agent such as isocyanate prepolymer, alkyl titanate, and polyethyleneimine, and polyethylene, ethylene and acrylic acid, and methacrylic acid. , A copolymer of acrylic acid ester or methacrylic acid ester, a thermoplastic resin such as an ionomer, or the like, and a thickness of 10 to 50 μm is suitable. The carbon black-containing polyolefin is a polyolefin containing 0.5 to 10% of carbon black, and the density of the polyolefin is 0.88 to 0.94, and it is polyethylene or a copolymer of ethylene and α-olefin.

The sheet obtained as described above is folded or folded at the end face of the sheet punched into the shape of the container so that the cross section of the sheet end does not directly contact the contents when it becomes a container. The end of the sheet is shaved so that the thickness of the container is uniform, the end is processed by folding it back, and the body of the container is joined with a frame seal or hot air seal to form a tubular shape. A packaging machine is used to join the bottoms, fill the contents later, and seal the top to complete. The shape of the molded container is, for example, a gobel top shape as shown in FIG.

[0010]

In the present invention, by providing a stretched high-density polyethylene film layer having high water vapor barrier properties, impact strength and bending pinhole resistance on the inner surface of the paper layer which is the base material of the liquid container, the liquid container is made highly efficient. Exhibits water vapor barrier properties. Concomitantly, by providing a biaxially stretched polyester film layer on the inner surface layer of the paper layer, the liquid container itself
It is possible to provide a liquid container having a light-shielding property with respect to the contents by providing a carbon black-containing polyolefin film layer having a high strength and a light-shielding property.

[0011]

EXAMPLES The concrete constitution of the present invention will be described below with reference to examples.

Example 1 Biaxially stretched high density polyethylene 20μ (Tonen Petrochemical Lupic HR) and biaxially stretched polyethylene terephthalate film 12μ (Toyobo N
-5100) and a two-component curing type urethane adhesive are dry-laminated, and a biaxially stretched polyethylene terephthalate film side is coated with a low-density polyethylene film of 60 μm (Dainippon Resin SKL) and an isocyanate-based anchor coating agent. Sand lamination was performed with 20 μ low density polyethylene (Mirason 16SP manufactured by Mitsui Petrochemical Co., Ltd.).
An isocyanate-based anchor coating agent was applied to the biaxially stretched high-density polyethylene side, and 15 μ of low-density polyethylene was extrusion-laminated. Further, the paper (340 g / m ² ) and the surface of the low density polyethylene were sandwiched with 15 μ of low density polyethylene, and 30 μ of low density polyethylene was extrusion-laminated on the other surface of the paper. A 1 liter Goebel top type carton 12 was molded from the obtained sheet, and the water vapor barrier property was 0.08 g / ke.24Hr.
(40 ° C. 90% RH).

Example 2 As in Example 1, after laminating a biaxially stretched high density polyethylene film, a biaxially stretched polyethylene terephthalate film and a low density polyethylene film, the biaxially stretched high density polyethylene film was placed on the side. A low density polyethylene film (30 μ) containing 3.2% of carbon black was dry laminated with a two-component curing type urethane adhesive. Paper (340 g / m ² )
And the carbon black-containing polyethylene surface with a low-density polyethylene of 20μ (Mirason 16S manufactured by Mitsui Petrochemical Co., Ltd.
Sand lamination was performed with P), and 30 μ of low density polyethylene was extrusion-laminated on the other surface of the paper. When a 1-liter Gobel top type carton 12 was molded from the obtained sheet, the water vapor barrier property was 0.08 g / ke.
It was 24 Hr (40 ° C. 90% RH).

[0014]

As described above, the container of the present invention is
It has a high water vapor barrier property and prevents the contents of the material from being lost over time.For example, cosmetics such as shampoo and conditioner, sake, alcohol such as shochu, seasonings such as soy sauce, and kitchen use. It is suitable as a container for toiletries such as detergents, liquid detergents and softeners, car detergents, chemicals such as wax and oil. Further, it is preferable from the viewpoint of resource saving and environmental conservation because it can be recycled as waste paper without the problem of a container in which aluminum foil is laminated for waste treatment of empty containers after use.

[0015]

[Brief description of drawings]

FIG. 1 is a diagram showing a layer structure of a sheet of a liquid container according to the present invention.

FIG. 2 is a view showing a layer structure in which a biaxially stretched polyester film is added to the structure shown in FIG.

FIG. 3 is a view showing a layer structure in which a carbon black-containing polyolefin film is added to the structure shown in FIG.

FIG. 4 is a perspective view of a Gobel top type container.

[Explanation of symbols]

 1 Paper Layer 2 Polyolefin Layer 3 Stretched High Density Polyethylene Film 4 Adhesive Layer 5 Adhesive Layer 6 Polyolefin Layer 7 Biaxially Stretched Polyester Film 8 Adhesive Layer 9 Carbon Black-Containing Polyolefin Film 10 Adhesive Layer 11 Adhesive Layer 12 Gobel Top Container

Claims (3)

[Claims] 1. A paper layer (1), a stretched high-density polyethylene film (3) attached to the inside of the paper layer (1), and a polyolefin layer (6) inside the paper layer (1). A liquid container formed of a sheet having a polyolefin layer (2) on the outside of 1). 2. The liquid according to claim 1, wherein a biaxially stretched polyester film (7) is interposed between the stretched high-density polyethylene film (3) and a polyolefin layer (6) inside thereof. container. 3. The liquid according to claim 1, wherein a carbon black-containing polyolefin film (9) is interposed between the paper layer (1) and the stretched high-density polyethylene film (3). container.