JPS62191144A - Laminated material for extrusion tube - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a laminated material formed in the container body of an extruded tube container in which pasty substances such as toothpaste, glue, and paste are accommodated. , relates to a laminate material for extruded tubes.

[Conventional technology]

Extruded tube containers that contain paste-like substances (fluid to semi-fluid substances) such as toothpaste, glue, and paste have a container body that is made of a laminated material with predetermined physical properties. Generally, it consists of a container to which separate shoulder and neck parts are attached, and a cap that is fitted onto the neck part.

Therefore, the container body of the extruded tube container must exhibit stiffness, which is an inevitable physical property of extruded tube containers, and the laminate material constituting the container body must have the layer Generally, a paper layer with excellent rigidity is used as an essential constituent layer in order to express the strength of the material.For example, synthetic resin layer / colored synthetic resin layer / paper layer / metal foil A laminated material for tubes having a laminated structure of layer/synthetic resin layer has been used.

[Problem that the invention seeks to solve]

By the way, in the conventional extruded laminated material for tubes, the paper layer present in the laminated structure of the laminated material has extremely poor water resistance, so it is exposed at the bonded part of the laminated material in the body of the tube container. Due to the influence of water that enters from the paper layer portion on the end surface of the laminate, peeling occurs between the layers of the laminate, making it impossible to completely maintain the original packaging function.

For this reason, tube container bodies have been proposed in which various additional processes are added to prevent the laminated end surface from being exposed at the bonded part of the laminated materials in the tube container body. In addition to the above-mentioned forming process, an additional process for treating the end faces of the laminate is required, and the forming process is complicated.

On the other hand, the extruded laminate material for tubes of the present invention has an intermediate layer made of a biaxially stretched synthetic resin film in place of the above-mentioned paper layer in its laminate structure, thereby replacing the conventional paper layer. It has been possible to provide an extruded laminate material for tubes that exhibits exactly the same strength and rigidity as the laminate material for tubes.

[Means for solving problems]

In the extruded tube laminate of the present invention, the outermost layer, which becomes the outer layer of the container body when molded into the container body of an extruded tube container, is composed of a synthetic resin layer having heat sealing performance. The innermost layer, which becomes the inner layer of the bush container body when molded into a container, is also made of a synthetic resin layer having heat sealing performance, and a biaxially oriented synthetic resin is provided between the outermost layer and the innermost layer. An intermediate layer consisting of a film layer is interposed, and no paper layer is present in the laminate structure of the extruded laminate for tubes.

That is, the extruded laminated material for tubes of the present invention has an outermost layer made of a synthetic resin layer having heat-sealing performance, an innermost layer made of a synthetic resin layer also having heat-sealing performance, and a layer between the outermost layer and the innermost layer. The layer consists of one or more layers located at It does not have a paper layer, specifically it is made up of only a synthetic resin layer, or it is made up of a synthetic resin layer and a metal layer.

In the extruded laminate for tubes of the present invention having the above structure, when a biaxially oriented synthetic resin film having a printed layer is used as the biaxially oriented synthetic resin film serving as the intermediate layer, a printed layer with a good printing effect can be obtained. Not only will you be
Since the printing layer is formed on a biaxially stretched synthetic resin film that has excellent surface smoothness, it has characteristics such as good printing and the ability to create complex patterns. In particular, the printed layer in conventional extruded laminate materials for tubes is produced by printing on the surface of the intermediate layer of a laminate sheet consisting of an intermediate layer and the innermost layer, and further forming an outermost layer on the surface of the intermediate layer. In contrast, the above-mentioned effect obtained by the printing layer in a biaxially stretched synthetic resin film on which the printing layer has been formed in advance is more noticeable.

The extruded laminate material for tubes of the present invention further comprises another layer between the outermost layer and the innermost layer in addition to the above-mentioned biaxially oriented synthetic resin film layer, that is, a synthetic resin layer having gas barrier performance or a metal layer. When a foil layer or a colored synthetic resin layer as a hiding layer is provided, these layers may be placed between the outermost layer and the intermediate layer, between the intermediate layer and the innermost layer, or between the outermost layer and the innermost layer. It may extend both between the outer layer and the intermediate layer and between the intermediate layer and the innermost layer, but in the case where the intermediate layer composed of a biaxially stretched synthetic resin film has a printed layer. Of course, the metal layer and the concealing layer are located between the intermediate layer and the innermost layer.

Furthermore, in the laminated material for extruded tubes of the present invention having the above structure, when the outermost layer and the innermost layer are made of the same synthetic resin, a heat welding step is performed when forming the container body from the laminated material. It is extremely easy to do this, and a container body with excellent adhesive strength at the sealing portion can be obtained.

As mentioned above, in the extruded tube laminate of the present invention having the above-described structure, the outermost layer is made of a resin having heat-sealing properties, but this outermost layer also functions as a protective layer. Usually, the layer is transparent to semitransparent so that the printed layer attached to the intermediate layer made of biaxially stretched synthetic resin film can be seen through, for example, Low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene, propylene and carboxylic acid Synthetic resins such as copolymers with compounds, ethylene-α/olefin copolymers, polyacrylonitrile, and polyamides are used.

In addition, the biaxially stretched synthetic resin film layer serving as the intermediate layer is as follows:
Biaxially stretched films made of synthetic resins such as polyethylene terephthalate, polyamide, polypropylene, polyethylene, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, polystyrene, and polyacrylonitrile are used. In addition, when a biaxially stretched synthetic resin film having a printed layer is used as an intermediate layer, the printed layer may be formed on the front surface or the back surface of the biaxially stretched synthetic resin film. In the case of a biaxially oriented synthetic resin film having a printed layer on the front surface, by forming a solid colored printed layer on the back surface, the intermediate layer can also be provided with hiding performance.

The innermost layer is made of a synthetic resin that has heat-sealing properties like the outermost layer, but since the innermost layer is in contact with the filling contained in the extruded tube container, it is possible that the filling is a food or drink. In this case, it is preferable to use polyolefin due to its sanitary properties.

Furthermore, in the extruded laminated material for tubes, when the outermost layer and the innermost layer are composed of the same synthetic resin, the adhesive strength of the sealing part of the resulting container body is good, as described above. However, because of the same superior adhesive strength, the shoulders and neck parts that are joined to the container body are also made of the same thermoplastic synthetic resin as the outermost and innermost layers of the laminated material. Most preferably, it is made of resin.

Furthermore, the extruded laminate material for tubes of the present invention can be produced by a bonding process using an adhesive to bond each layer, or by extrusion coating each predetermined layer on a biaxially stretched film serving as an intermediate layer. It is obtained by combining a bonding process using an adhesive and extrusion coating.

〔Example〕

Hereinafter, the specific structure of the laminate material for extruded tubes of the present invention will be explained using manufacturing examples.

Example A printed layer of polyurethane gravure ink was formed on a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm to obtain a polyethylene terephthalate film having a beautiful colored printed layer.

Next, an isocyanate-based anchor coating agent was applied to the colored printed layer surface of the polyethylene terephthalate film having the colored printed layer by a roll coating method, and then a thickness of 3
A 0 μm low density polyethylene layer and a 70 μm thick milky white polyethylene layer are sequentially laminated by an extrusion coating method, and then a 30 μm thick ethylene-methacrylic acid copolymer layer is extrusion coated on the milky white polyethylene layer, and at the same time, this ethylene layer is laminated using an extrusion coating method. - A 10 μm thick aluminum foil was laminated on the methacrylic acid copolymer layer.

Further, an ethylene-methacrylic acid copolymer layer with a thickness of 50 μm and a low-density polyethylene layer with a thickness of 80 μm were sequentially laminated on the aluminum foil by an extrusion coating method.

After that, the same incyanate-based anchor coating agent was applied by roll coating to the non-printing layer surface of the polyethylene terephthalate film having the colored printing layer, and then the same insyanate-based anchor coating agent was applied to the non-printing layer surface of the polyethylene terephthalate film having the colored printing layer.
An embodiment of the extruded tube laminate material of the present invention is obtained by sequentially laminating 30μ thick low-density polyethylene layers containing an antistatic agent using an extrusion coating method. A laminate material for an extruded tube comprising an outermost layer consisting of a layer, an intermediate layer consisting of a biaxially oriented polyethylene terephthalate film having a colored printed layer on the back side, and an innermost layer consisting of a low density polyethylene layer having a thickness of 80μ. Obtained.

When a container body was formed by a heat welding method using the laminated material obtained above, the tactile feel was completely different from that of a container body obtained from a conventional laminated material in which a paper layer was present. A similar finger touch feeling was obtained, and a firm product was obtained.

In addition, the beautiful gragua printing layer attached to the biaxially stretched polyethylene terephthalate film produced an excellent printing effect, and also had an excellent effect in terms of design.

[Operation and effect of the invention]

The extruded laminate material for tubes of the present invention does not include a paper layer in the laminate structure constituting the laminate material, and is indispensable and indispensable in order to exhibit stiffness in conventional laminate materials for tubes. The biaxially oriented synthetic resin film layer exhibits the effect of the paper layer, which was considered to be the same.

Therefore, even when the extruded laminate material for tubes of the present invention is used in an environment where it easily comes into contact with water, such as in a toothpaste, the laminate material does not delaminate due to moisture absorption, and is extremely excellent. This has the effect of providing a tube container body having water resistance.

In addition, the extruded laminated material for tubes of the present invention has a biaxially oriented synthetic resin film layer in the laminated structure that provides the laminated material with stiffness and stiffness. This results in a tube container body that has exactly the same tactile feel to the finger.

Furthermore, in the extruded laminate material for tubes of the present invention, by using a pre-printed biaxially oriented synthetic resin film as the biaxially oriented synthetic resin film layer present in the laminate structure, complicated Moreover, it also has the function and effect that a tube container body having a beautiful printed layer has a design effect.

Claims (5)

[Claims] (1) An outermost layer consisting of a synthetic resin layer having heat-sealing performance, an innermost layer consisting of a synthetic resin layer also having heat-sealing performance, and a biaxially stretched synthetic resin film located between the outermost layer and the innermost layer. 1. A laminate material for an extruded tube, comprising an intermediate layer consisting of layers, and further comprising no paper layer in the laminate structure. (2) The laminate for extruded tubes according to claim 1, wherein the intermediate layer is a biaxially oriented synthetic resin film layer having a printed layer. (3) Laminated material for extruded tubes according to claim 1 or 2, wherein a gas barrier layer consisting of a metal foil or a synthetic resin layer having gas barrier properties is present between the intermediate layer and the innermost layer. . (4) Claims 1 and 2, in which a concealing layer made of a colored synthetic resin layer is present between the intermediate layer and the innermost layer;
Or the laminate material for extruded tubes according to item 3. (5) Claims 1, 2, 3, or 4, wherein the synthetic resin constituting the outermost layer and the synthetic resin constituting the innermost layer are of the same synthetic resin. Laminated material for extruded tubes.