JPH0621869Y2 - Laminated material for extrusion tubes - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a laminated material formed on a container body of an extruded tube container containing a paste-like substance such as toothpaste, paste, and paste, that is, , A laminated material for extruded tubes.

[Prior Art] An extruded tube container containing a paste-like substance (fluid to semi-fluid substance) represented by toothpaste, paste, paste, etc. is formed of a laminated material having predetermined physical properties. It is generally composed of a container main body in which a neck portion having a separately-made shoulder portion is attached to an existing container body portion, and a cap fitted in the neck portion.

In the container body of the extruded tube container, the waist strength, which is an indispensable physical property in the extruded tube container, must be exhibited, and the waist strength appears in the laminated material forming the container body. A paper layer having excellent rigidity is used as an essential constituent layer for the purpose of taking it out. For example, a tube having a laminated structure of synthetic resin layer / colored synthetic resin layer / paper layer / metal foil layer / synthetic resin layer. Laminated material was used.

[Problems to be solved by the invention] By the way, in the conventional extruded tube laminated material,
Since the paper layer existing in the laminated structure of the laminated material is extremely poor in water resistance, water penetrating from the paper layer portion of the end surface of the laminated material exposed at the portion where the laminated material is bonded in the body part of the tube container. Due to the influence of (3), peeling occurs between the layers of the laminated material, and there is a drawback that the original packaging function cannot be completely maintained.

For this reason, a tube container body part in which various additional steps are added so that the laminated material end face is not exposed at the laminated material bonding part in the tube container body part is proposed, but the original tube container body part In addition to the molding process of (1), an additional process for treating the end surface of the laminated material is required, and molding is complicated.

Further, the conventional extruded tube laminated material is to obtain a gas barrier property by burying a metal foil layer in the structure thereof, and the tube container body obtained by the laminated material becomes opaque. It is not possible to visually confirm the remaining amount of the filling material during the period, which causes inconvenience.

On the other hand, in the present invention, in place of the above-mentioned paper layer and metal foil layer during the laminating process, the biaxial of ethylene / vinyl alcohol copolymer or polyvinylidene chloride resin having both gas barrier property and rigidity is provided. It has a rigid intermediate layer made of a stretched synthetic resin film, and it is possible to visually check the internal filler that cannot be obtained with the conventional tube laminate having the paper layer and the tube laminate having the metal foil layer. A laminated material for a paperless extruded tube that exhibits excellent transparency, a stiffness (rigidity) similar to that achieved by the paper layer, and a gas barrier property similar to that achieved by the metal foil layer. provide.

[Means for Solving the Problems] In the laminated material for a paperless extruded tube of the present invention, the outer layer, which is an outer layer of the extruded tube container, is an outer layer of the extruded tube container having a heat-sealing performance. Comprised of a synthetic resin layer having, the inner layer which is also an inner layer of the container body when formed into a container body is also composed of a synthetic resin layer having heat sealing performance, and the outer layer and the inner layer A three-layer structure in which an intermediate layer having rigidity made of a biaxially stretched synthetic resin film of an ethylene / vinyl alcohol copolymer or a polyvinylidene chloride resin is located in between.

The biaxially stretched synthetic resin film forming the intermediate layer has a partial printed pattern layer formed thereon, and is transparent as a whole except for a portion hidden by the printed pattern layer in a plan view. It is a semi-transparent part and has gas barrier properties as a whole.

The container body obtained by the laminated material for a paperless extruded tube of the present invention having the above-described configuration can visually recognize the internal filler through the transparent to translucent portion of the laminated material.

As described above, the outer layer of the laminated material for a paperless extruded tube of the present invention is composed of a synthetic resin having a heat-sealing property, but this outer layer also functions as a protective layer, and the gas is A biaxially stretched synthetic resin film having a barrier property, that is, an extruded tube so that the printed pattern layer attached to the biaxially stretched synthetic resin film made of an ethylene / vinyl alcohol copolymer or a polyvinylidene chloride resin can be seen through. The transparent to semi-transparent layer is formed so that the filling material in the extruded tube container made of the laminated material can be visually recognized.

This outer layer is, for example, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer,
Made of synthetic resin such as ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, copolymer of ethylene or propylene and carboxylic acid compound, ethylene-α / olefin copolymer, polyacrylonitrile, polyamide Is normal.

The inner layer is composed of a synthetic resin having a heat-sealing property like the outer layer, but since the inner layer is a layer in contact with the inner filler contained in the extruded tube container, the inner filler is
In the case of food, it is preferable to be composed of polyolefin because of its hygienic problems.

The biaxially stretched synthetic resin film used as the intermediate layer having rigidity is a film made of ethylene / vinyl alcohol copolymer or polyvinylidene chloride resin and has both gas barrier property and rigidity. This biaxially stretched synthetic resin film has a partially printed pattern layer that does not serve as a solid-state masking layer. The printed pattern layer may be formed on the front surface or the back surface of the biaxially stretched synthetic resin film.

Further, in the paperless extruded tube laminated material, when the outer layer and the inner layer are made of the same synthetic resin, the heat welding step when molding the container body of the extruded tube container from the laminated material is extremely A container body that is easy and has excellent adhesive strength at the sealing portion can be obtained.

Also, because the same excellent adhesive strength can be obtained,
It is most preferable that the shoulder portion and the neck portion joined to the container body are also extruded tube containers made of the same synthetic resin as the thermoplastic synthetic resin forming the outermost layer and the innermost layer of the laminated material. It is suitable.

Further, the laminated material for a paperless extruded tube of the present invention is
By a bonding process using an adhesive that bonds each layer, or by extrusion-coating each predetermined layer on a biaxially stretched film that is an intermediate layer, or by a bonding process using an adhesive and extrusion coating. It is obtained by using together.

[Examples] Hereinafter, a specific configuration of the laminated material for a paperless extruded tube of the present invention will be described with reference to manufacturing examples.

Examples Linear low-density polyethylene film [Tama Poly Co., Ltd.
Made: UB-1,150μ] and a biaxially stretched ethylene / vinyl alcohol copolymer film [Eval XL film: 15μ, made by Kuraray Co., Ltd.] with a partially printed pattern layer formed by a gravure printing method. Was prepared, and the non-printed surface of the biaxially stretched ethylene / vinyl alcohol copolymer film and one piece of the linear low-density polyethylene film were bonded together with a two-component curing type urethane adhesive, and then obtained. The printed surface of the laminated film and another linear low-density polyethylene film are adhered with the same two-component curing type urethane adhesive, and the laminated structure shown in the drawing, that is, the linear low-density polyethylene resin layer ( 15
0 μ) outer layer 2, an adhesive S ₁ , a biaxially stretched ethylene / vinyl alcohol copolymer film layer (15 μ) having a printed pattern layer M on the back surface, and a rigid intermediate layer 3, and an adhesive S 1. _A laminated material 1 for a paperless extruded tube, which is an example product of the present invention, having a laminated constitution of 2 and an inner layer 4 made of a linear low-density polyethylene resin layer (150 μ) was obtained.

Using the obtained laminated material for extruded tube without paper, a container body of an extruded tube container was formed by a heat welding method, and a container obtained from a laminated material in which a paper layer is present in a conventional laminated structure A strong product having the same feel as that of the body was obtained.

In addition, the beautiful gravure printing layer attached to the biaxially stretched ethylene / vinyl alcohol copolymer film exhibits an excellent printing effect, and also has an excellent effect in terms of designability. Parts other than layers (in plan view)
Had transparency such that the inside of the container was easily visible.

[Operation and Effect of the Invention] The laminated material for a paperless extruded tube of the present invention does not have a paper layer in the laminated structure constituting the laminated material, and is strong in the conventional laminated material for a tube. The function of the paper layer, which has been indispensable and essential for achieving the desired effect, is produced by a biaxially stretched synthetic resin film having gas barrier properties and rigidity, that is, an ethylene / vinyl alcohol copolymer film or a vinylidene chloride resin. It is expressed by an axially stretched film.

Therefore, the laminated material for a paperless extruded tube of the present invention does not cause delamination of the laminated material due to moisture absorption even when used in an environment where it is likely to come into contact with water, such as toothpaste. This has the function and effect of obtaining a tube container body having excellent water resistance.

In addition, the laminated material for a paperless extruded tube of the present invention not only has the above-mentioned gas barrier property, but also has the rigidity of the biaxially stretched synthetic resin film that provides the extruded tube laminated material with rigidity (rigidity). Since it has
The tube container body has the same feel and feel as a laminated material having a conventional paper layer, and has the same excellent gas barrier properties as a laminated material having a metal foil layer.

Further, the laminated material for a paperless extruded tube of the present invention does not have a layer serving as a concealing layer for an internal filler such as a paper layer or a metal foil in the laminated structure of the laminated material, and the printed pattern layer is partially formed. It is a printed pattern layer that is formed, that is, since the portion other than the printed pattern layer in a plan view is transparent to translucent, it is possible to easily see through the filling material from the portion. An extruded tube container that gives consumers a sense of security is obtained.

Furthermore, the laminated material for a paperless extruded tube of the present invention is
A biaxially stretched synthetic resin film having gas barrier properties, which is an intermediate layer having rigidity, is provided with a printed pattern layer in advance, so that a complicated and beautiful printed layer provides a design effect. A tube container body is obtained.

That is, since the printing layer is formed on the biaxially stretched synthetic resin film having excellent surface smoothness,
The printing is good, and it has features such that a complicated pattern can be revealed. In particular, a printed layer in a conventional extruded tube laminate is revealed by printing on the surface of the intermediate layer of the laminated sheet of the intermediate layer and the innermost layer, and further forming an outermost layer on the surface of the intermediate layer. Or, the above-mentioned effect obtained by the printing layer in the biaxially stretched synthetic resin film in which the printing layer is formed in advance, as compared with the one which is revealed by applying the printing to the surface of the laminated material, The effect is extremely remarkable.

Furthermore, the laminated material for a paperless extruded tube of the present invention is
Since it is composed of the synthetic resin constituting each of the outer layer, the intermediate layer, and the inner layer and the adhesive agent used in some cases, the structure is simple and therefore the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a model of one embodiment of the laminated material for a paperless extruded tube of the present invention. 1: Laminated material for extruded tube without paper, 2: Outer layer, 3: Intermediate layer having rigidity by biaxially stretched synthetic resin film of ethylene / vinyl alcohol copolymer or polyvinylidene chloride resin, 4: inner layer, S ₁ , S ₂ : Adhesive.

Claims (3)

[Scope of utility model registration request] 1. An outer layer made of a synthetic resin layer having heat sealability, an inner layer made of a synthetic resin layer having heat sealability, and an ethylene / vinyl alcohol copolymer or polychlorine located between the outer layer and the inner layer. A laminated material having a three-layer structure composed of a biaxially stretched synthetic resin film of vinylidene resin and an intermediate layer having rigidity, and a partially printed pattern layer is formed on the biaxially stretched synthetic resin film forming the intermediate layer. The laminated material for a paperless extruded tube is characterized in that it is transparent to translucent as a whole and has a gas barrier property in a portion other than the portion where the printed pattern layer is present in a plan view. . 2. A utility model registration request wherein an outer layer and an inner layer of a synthetic resin layer having heat sealing performance are formed by extrusion coating layers with respect to a biaxially stretched synthetic resin film constituting an intermediate layer. A laminated material for a paperless extruded tube according to claim 1. 3. A synthetic resin film layer in which an outer layer and an inner layer made of a synthetic resin layer having a heat-sealing property are attached with an adhesive to a biaxially stretched synthetic resin film constituting an intermediate layer. The laminated material for a paperless extruded tube according to claim 1, which has been formed.