JP2886877B2 - Laminated sheet for tube container - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated sheet used as a material for forming a body of a container when obtaining a tube container, and particularly relates to a fragrance and a vegetable oil made of a terpene hydrocarbon. This is a laminated sheet used as a material for the body of a tube container suitable for filling a paste-like material containing foods, medicines, dyes, etc., containing the same. Provided is a laminated sheet for a tube container that also has the property of being easy.

“Prior art” A tube container in which a fluid-semi-fluid filling material represented by a paste-like material is filled, a tube-shaped container body whose lower end is closed, and the tube-shaped container It is composed of a shoulder continuous with the upper end of the torso, a mouth and neck continuous with the shoulder, and a cap removably engaged with the mouth and neck. In the case of a tube container in which a substance is filled, it is required that the container has excellent properties with respect to gas barrier properties, for example, a metal container body or a polyolefin resin layer. A tube container having a container body made of a laminated sheet of metal and metal foil is used.

"Problems to be Solved by the Invention" By the way, the tube container having the conventional metal container body has excellent properties with respect to gas barrier properties due to the properties of the material of the container body. ,
Depending on the type of filling material to be filled in the container, the metal that is the material of the container body corrodes, which may cause pinholes in the container body or extrude the filling by squeezing the tube container. Due to the structure of the container body, since the container body is formed of a very thin metal foil, the mechanical properties of the container body are poor, for example, at the time of filling work or filling the tube container by a consumer. Etc.
There is a disadvantage that the container body is easily broken.

Further, in a tube container having a container body made of a laminated sheet of a polyolefin-based resin layer and a metal foil, the resin is used because the polyolefin-based resin layer, which is the inner peripheral surface layer of the container body, has heat sealing properties. Layers for example
Due to having a thickness of 80μ or more, there is a problem on quality retention characteristics due to the fact that the inner peripheral surface layer of the container body absorbs the flavor component and the active ingredient in the filling. have.

On the other hand, the present invention is particularly applicable to the case where pastes such as foods and medicines containing fragrances and vegetable oils based on terpene hydrocarbons, and daily necessities mixed with dyes are included. Also, a laminated sheet for a tube container that does not reduce the quality characteristics of the filling,
Moreover, the present invention provides a laminated sheet for a tube container, which has a characteristic that it is easy to manufacture due to its structure.

Means for Solving the Problems The first invention is directed to a surface comprising a three-layer co-extruded laminated sheet of a resin layer / adhesive polyolefin-based resin layer / polyolefin-based resin layer using a saponified ethylene-vinyl acetate copolymer. A resin layer, an intermediate layer having gas barrier properties,
Resin layer of saponified ethylene-vinyl acetate copolymer /
A laminated sheet obtained by laminating an adhesive polyolefin-based resin layer / polyolefin-based resin layer and a backside resin layer composed of a three-layer coextruded laminated sheet, and a saponified ethylene-vinyl acetate copolymer in the surface resin layer. The laminated sheet for a tube container is formed by laminating a resin layer and a resin layer of a saponified ethylene-vinyl acetate copolymer on the back surface resin layer so as to form outermost layers of the laminated sheet.

According to a second aspect of the present invention, in the configuration of the laminated sheet for a tube container according to the first aspect, the intermediate layer having gas barrier properties is selected from an aluminum foil, a vinylidene chloride resin layer, and a polyamide resin layer. A laminated sheet for a tube container comprising a single layer or a composite layer of one or more layers selected from the single layer and paper or other resin layers.

In the laminated sheet for a tube container according to the present invention having the above-mentioned structure, the resin made of the saponified ethylene-vinyl acetate copolymer includes an ethylene-vinyl acetate copolymer having an ethylene content of 25 to 60 mol% and a saponification degree of 96% or more. It is preferred to use a saponified polymer.

Further, an intermediate layer in the laminated sheet for the tube container,
That is, the layer having gas barrier properties is preferably a layer containing a gas barrier property layer made of, for example, an aluminum foil, a polyamide resin layer, a vinylidene chloride resin layer, etc., and particularly a gas barrier property layer made of an aluminum foil. A base resin film that has been subjected to back printing to provide a design effect by printing, and a base resin film such as a biaxially oriented polyester film, a biaxially oriented polypropylene film, and a biaxially oriented polyamide film, and It is preferable to use a laminate in which a gas barrier layer is laminated with a polyolefin resin layer interposed therebetween.

The intermediate layer having gas barrier properties is a surface resin layer composed of a three-layer co-extruded laminated sheet of a resin layer made of saponified ethylene-vinyl acetate copolymer / adhesive polyolefin resin layer / polyolefin resin layer, and the same. Resin layer of saponified ethylene-vinyl acetate copolymer /
Normally, an isocyanate-based adhesive, an adhesive polyolefin-based resin, an adhesive polyolefin-based resin layer, and a polyolefin-based resin layer.
It is laminated via a polyolefin resin or the like.

Examples of the polyolefin resin layer of the three-layer coextruded laminated sheet of a resin layer of the saponified ethylene-vinyl acetate copolymer / adhesive polyolefin resin layer / polyolefin resin layer include low-density polyethylene, medium-density polyethylene, and high-density polyethylene. Density polyethylene or the like is used.

Similarly, as the adhesive polyolefin resin layer, polyethylene resin such as ethylene-vinyl acetate copolymer, ionomer, ethylene-acrylic acid copolymer, ethylene-methyl methacrylic acid copolymer, and polypropylene resin are used. You.

The tubular body serving as the tube container body portion is configured such that the back surface layer of the laminated sheet becomes the container inner peripheral surface layer, for example, one side portion and the other immediate side portion of the laminated sheet overlap each other,
The laminated sheet is formed by heat bonding the contact portion between the surface layer and the back surface layer of the laminated sheet in the overlapping portion.

In addition, the shoulder and the head of the tube container are preferably formed by injection molding of one end of a tubular body serving as the tube container body attached to a mandrel, preferably using a saponified ethylene-vinyl acetate copolymer. By performing the above, it is easily formed.

On the inner peripheral surface side of the container at the shoulder of the tube container, a surface resin layer and a rear resin layer similar to those described with respect to the front resin layer and the rear resin layer of the laminated sheet for the tube container are used. Laminating a film, a sheet, and a laminate formed of a molded article having a multilayer structure of a first resin layer composed of: a second resin layer having gas barrier properties / a third resin layer composed of a back resin layer. Can also.

Lamination of this laminate on the inner peripheral surface of the container at the shoulder of the tube container is easily performed by insert molding comprising performing injection molding of the shoulder with a separately manufactured laminate prepared in advance attached to a mandrel. I can do it.

"Example" Hereinafter, a specific configuration of the laminated sheet for a tube container of the present invention will be described with reference to a production example.

Example 1 In FIG. 1, a resin layer 15 made of a saponified ethylene-vinyl acetate copolymer "Eval E" having a thickness of 10 .mu.
Adhesive polyolefin resin of 10μ `` Admer NF505: Mitsui Petrochemical Industry '' layer 16, and low-density polyethylene resin of 40μ thickness `` Mirason 16P: Mitsui Petrochemical Industry '' three-layer co-extruded laminated sheet 18 with layer 17, The three-layer co-extruded laminated sheet 1 having the same lamination structure as the three-layer co-extruded laminated sheet 18
9, that is, a resin layer 20 of a saponified ethylene-vinyl acetate copolymer “EVAL E” having a thickness of 10 μm and a thickness of 10 μm
A three-layer co-extruded laminated sheet 19 of the adhesive polyolefin resin “Admer NF505: Mitsui Petrochemical” layer 21 and the low-density polyethylene resin “Milason 16P: Mitsui Petrochemical” layer 22 having a thickness of 40μ is prepared. did.

Then, printing by back printing m, thickness 12μ with m
Biaxially stretched polyester film "Ester film E5
100: Toyobo Co., Ltd. 1 and the low-density polyethylene resin layer 17 of the three-layer co-extruded laminated sheet 18 (= surface resin layer) with the isocyanate-based adhesive “Takelac A310:
Takeda Pharmaceutical Co., Ltd.] After laminating via the layer 3, the aluminum foil 4 having a thickness of 20 μm is further laminated on the printed m, m surfaces of the biaxially stretched polyester film 1 using the isocyanate-based adhesive layer 5. Then, the low-density polyethylene resin layer 22 of the three-layer co-extruded laminated sheet 19 (= backside resin layer) is similarly bonded to the four surfaces of the aluminum foil by using the isocyanate-based adhesive layer 7. An example of the laminated sheet for a tube container of the present invention, which is indicated by reference numeral 23 in FIG. 3, was obtained.

Comparative Example 1 In the laminated sheet 23 used in Example 1, the surface resin layer composed of the three-layer co-extruded laminated sheet 18 and the back surface resin layer composed of the three-layer co-extruded laminated sheet 19 in the laminated constitution were each made to have a different thickness. A laminated sheet for a tube container was obtained as a comparative example product having the same configuration as the laminated sheet 23 of Example 1 except that the low-density polyethylene film layer of 70μ was made “Milason 16P: Mitsui Petrochemical Industry”. .

"Experiment" Using a blank plate punched out of the laminated sheet for the tube container obtained in Example 1 and Comparative Example 1,
In FIG. 2, a cylindrical body 9 having a diameter of 35 mm and a height of 150 mm in which the back surface resin layer of the laminated sheet is an inner peripheral surface layer is
The blank was obtained by overlapping the left and right sides of the blank plate with each other and thermally bonding them.

Next, the cylindrical body 9 was mounted on a mandrel. Further, in the case of using the cylindrical body 9 made of the laminated sheet for the tube container of the first embodiment, the mandrel corresponding to the shoulder formed in a later step, that is, one end of the cylindrical body 9 And a laminated sheet [1] having the following laminated structure was interposed.

Laminated sheet [1] Saponified ethylene-vinyl acetate copolymer "EVAL E"
Resin layer (20μ) / isocyanate-based adhesive layer / Al foil (20μ) / isocyanate-based adhesive layer / third resin layer (20μ) of saponified ethylene-vinyl acetate copolymer “EVAL E” Subsequently, a frusto-conical shoulder portion 10 and a neck and neck portion 11 of a narrow neck are connected to the one end of the cylindrical body 9 by injection of a saponified ethylene-vinyl acetate copolymer “EVAL E”. In the case of using the cylindrical body 9 made of the laminated sheet for the tube container of Example 1 by molding,
A tube container precursor having the laminated sheet [1] laminated on the inner peripheral surface side of the container No. 10 was obtained.

Thereafter, the mouth and neck portion 11 of the narrow neck of the tube container precursor is sealed with a sheet material, and then the lower end of the cylindrical body 9 is filled with 200 g of orange fruit sauce, and then the lower end of the cylindrical body 9 is filled. A tube container indicated by reference numeral 14 in FIG. 2 was obtained by forming a hot-melt bonding portion 12 at the portion and engaging a cap 13 made separately with the mouth and neck.

After keeping this tube container at room temperature of 37 ° C. for one month, a sensory test was performed on the taste and aroma of the orange fruit sauce, which is the filling, and the laminated sheet for the tube container of Example 1 was obtained. Although the aroma and taste of orange were maintained in the filling in the tube container, the filling of the tube container by the laminated sheet for the tube container of Comparative Example 1 had almost the aroma of orange. Was not left.

[Effects of the Invention] The present invention relates to a surface resin layer composed of a three-layer coextruded laminated sheet of a resin layer made of a saponified ethylene-vinyl acetate copolymer / adhesive polyolefin resin layer / polyolefin resin layer, and a gas barrier property. And a resin layer made of saponified ethylene-vinyl acetate copolymer / adhesive polyolefin resin layer / polyolefin resin layer.
A laminated sheet obtained by laminating a backside resin layer composed of a layer co-extruded laminated sheet, and a resin layer of a saponified ethylene-vinyl acetate copolymer in the surface resin layer,
A resin layer of a saponified ethylene-vinyl acetate copolymer in the backside resin layer comprises a laminated sheet for a tube container which is laminated so as to form the outermost layer of the laminated sheet.

In the laminated sheet for a tube container of the present invention having the above structure, the front resin layer and the back resin layer are each formed of a resin layer of a saponified ethylene-vinyl acetate copolymer / adhesive polyolefin resin layer / polyolefin resin. Since it is formed of a resin having excellent properties with respect to the gas barrier property of the three-layer co-extruded laminated sheet, and the intermediate layer also incorporates a gas barrier layer,
Not only is it possible to obtain a tube container that has extremely excellent gas barrier performance against the inclusions, but also because the same type of resin layer is thermally bonded to each other at the time of thermal bonding when forming the tube container, Also has excellent characteristics.

Further, the laminated sheet for a tube container of the present invention, in a tube container using the laminated sheet as a molding material, the inner peripheral surface layer of the tubular container body is made of a saponified ethylene-vinyl acetate copolymer. Since it becomes a resin layer, it has low adsorption and permeation performance of flavor components contained in the filling in the tube container. For example, orange jam, lemon essence, toothpaste, shoes, hair dye, etc., especially terpene-based Deteriorates the quality characteristics of the filling, even when filling pastes such as foods, medicines, and daily necessities mixed with dyes, which contain hydrocarbon-based flavors and vegetable oils. It is possible to obtain a tube container having extremely excellent storage performance.

Further, the laminated sheet for a tube container according to the present invention is an ethylene-acetic acid having a property of high gas barrier properties and low adsorption and permeation performance of a flavor component contained in the filling in the tube container. Since the resin layer of the saponified vinyl copolymer is used in the form of a three-layer co-extruded laminated sheet of a resin layer of the saponified ethylene-vinyl acetate copolymer / adhesive polyolefin-based resin layer / polyolefin-based resin layer, In particular, there is no difficulty in molding due to the fact that a simple resin film of a saponified ethylene-vinyl acetate copolymer has the property of being hard and brittle, and also has a characteristic that its production is easy.

[Brief description of the drawings]

FIG. 1 is a model cross-sectional view showing one embodiment of a laminated sheet for a tube container of the present invention, and FIG. 2 is a front view showing a tube container obtained by using the laminated sheet for a tube container. 1 Biaxially stretched polyester film 4 Aluminum foil 15 Resin layer of saponified ethylene-vinyl acetate copolymer 16 Adhesive polyolefin resin layer 17 Low density polyethylene resin layer 18 Ethylene Resin layer of saponified vinyl acetate copolymer / adhesive polyolefin-based resin layer / surface resin layer composed of a three-layer co-extruded laminated sheet of polyolefin-based resin layer 19 ... Resin layer of saponified ethylene-vinyl acetate copolymer / Backside resin layer composed of a three-layer coextruded laminated sheet of an adhesive polyolefin-based resin layer / polyolefin-based resin layer 20: Resin layer of saponified ethylene-vinyl acetate copolymer 21: Adhesive polyolefin-based resin layer 22: Low-density polyethylene resin layer 23 ... Laminated sheet for tube container

Claims (2)

(57) [Claims] 1. A surface resin layer comprising a three-layer coextruded laminated sheet of a resin layer / adhesive polyolefin resin layer / polyolefin resin layer made of a saponified ethylene-vinyl acetate copolymer, and an intermediate layer having gas barrier properties. And a resin layer of saponified ethylene-vinyl acetate copolymer / adhesive polyolefin resin layer / polyolefin resin layer.
A laminated sheet obtained by laminating a backside resin layer composed of a layer co-extruded laminated sheet, and a resin layer of a saponified ethylene-vinyl acetate copolymer in the surface resin layer,
A laminated sheet for a tube container, characterized in that a resin layer of a saponified ethylene-vinyl acetate copolymer in a back resin layer is laminated so as to form outermost layers of the laminated sheet. 2. An intermediate layer having gas barrier properties in a laminated sheet for a tube container, wherein the intermediate layer has a single layer selected from an aluminum foil, a vinylidene chloride resin layer, a polyamide resin layer, or a single layer selected from the aforementioned single layers. Done 1
The laminated sheet for a tube container according to claim 1, comprising a composite layer of at least one kind of layer and a paper or other resin layer.