JPS61219638A - Sheath material and manufacture thereof - 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 provides a heat-shrinkable exterior with metallic luster, which is useful as an exterior for various articles that require an exterior, such as dry cells, cosmetic bottles, lipstick cases, etc. Materials and methods of manufacturing them.

(Prior art) Some commercially available exterior materials are made of heat-shrinkable plastic film with metallic luster.The structure is made by vapor-depositing aluminum or other metals on a heat-shrinkable plastic film base 2. The gold RIi formed by vapor deposition is coated with a synthetic resin.

As a result, the metal surface is protected by the resin, but on the other hand, since the resin film does not inherently have heat shrinkability, if the thickness exceeds a certain level, the plastic film will heat shrink. Not only does this have the effect of inhibiting and reducing the properties of the product, but the combination of heat-shrinkable and non-heat-shrinkable materials inevitably causes wrinkles, which significantly impairs the appearance and reduces the value of the product as an exterior material. I have a problem that I can't get.

Further, if the resin coating is thin, there are problems in that pinholes are formed in the coating, and sufficient durability cannot be expected, which limits the use of the coating.

Furthermore, when a heat-shrinkable plastic film with an aluminum layer protected by such a resin coating is used for electrical purposes such as dry batteries, it is difficult to ensure sufficient electrical insulation.

(Problems to be Solved by the Invention) The problems to be solved by the present invention are to solve the above-mentioned problems at once, and to provide a heat-shrinkable and well-protected aluminum layer and its metallic luster. The object of the present invention is to provide a material that is free from wrinkles, has excellent durability and electrical insulation properties, and is capable of being manufactured.

(Means for Solving the Problems) The means for the exterior material taken by the present invention to solve the above-mentioned problems is to form an aluminum layer by vapor deposition on one side of a heat-shrinkable plastic film lining. It is characterized by having a structure in which a heat-shrinkable plastic film surface is polymerized using a low-temperature curing adhesive as a medium.

The manufacturing method for the exterior material is to form an aluminum layer on one side of a heat-shrinkable plastic film lining by vapor deposition, then apply a low-temperature curing adhesive to the aluminum layer, and then apply the adhesive. It is characterized by having a configuration in which a heat-shrinkable plastic film outer material is used as a medium and polymerized in a pressure-bonded manner.

(Examples and effects) Examples of the present invention will be described in detail below.

In the figure, (A) is the exterior material, and to explain the basic structure of this exterior material (A), an aluminum layer (2) is formed by vapor deposition on one side of a heat-shrinkable plastic film lining (1), On this aluminum layer (2), a heat-shrinkable plastic film outer layer (4) is polymerized using a low-temperature curing adhesive (3) as a medium, and metallic luster aluminum 1t (2) is placed on the front and back sides. It is protected in a sandwich-like manner with heat-shrinkable plastic films (1) and (4), so that its metallic luster shines on the front and back films. Incidentally, FIG. 1 shows a specific example of the exterior material (A) having the basic configuration described above.

This exterior material (A>) is provided with a printed part (5) for labeling or labeling as well as for decoration, as required, and the printed part (5) is covered with plastic film outer material (4).
) is printed on the polymerized side with adhesive (3) in aluminum I! Similarly to (2), it is protected in a sandwich-like manner by the front and back plastic films (1) and (4), and the display and pattern are made to shine on the film surface (4) with a metallic luster. (Figure 2) In addition, if necessary, a pattern for display or decoration as a label or label is formed on the aluminum layer (2) of the exterior material (A), excluding appropriate parts of the same layer, as necessary. The display and pattern formed on this metallic glossy surface are made to stand out on the film lining (1) and/or the film outer material (4). (Fig. 3) Furthermore, the exterior material (A) may include an indication by the printing part (5), an indication by the packaging part and the aluminum layer (2), as necessary.
Includes both decoration and decoration.

(Figure 4) The heat-shrinkable plastic film lining (1) and the outer material (4) are transparent hard vinyl chloride or polystyrene, and the adhesive (3) is a light-curable adhesive that is heat-shrinkable plastic. It is desirable that the film has substantially no shrinkage ability.

In addition, the shrinkage rate of the exterior material (A) is 10 to 40% when the exterior material is formed into a cylindrical shape and used for exterior purposes.
is suitable, and is formed and used in such a form that its exterior is completely covered.

In addition, if it is necessary to clearly display characters, etc. or decorative patterns, it is desirable that the shrinkage rate be within about 10%, so that the display and pattern after shrinkage will be in a clear state without collapse. It is easy to do.

Next, the basic method for manufacturing the exterior material (A) will be explained.

forming an aluminum layer (2) on one side of a heat-shrinkable plastic film lining (1) by vapor deposition, and then applying a low-temperature curing adhesive (3) to the aluminum layer (2);
Next, a heat-shrinkable plastic film outer material (4) is roll-pressed and polymerized using the adhesive (3) as a medium, and the outer material (
A) is manufactured.

Above, the plastic film outer material during the manufacturing process (
In the polymerization step 4), it is desirable to carry out lamination at a temperature of about 50° C. or lower, that is, within a range where the film does not shrink.

In addition, regarding the exterior material (A) having the printed part (5),
Before polymerizing the plastic film outer material (4), a printed portion (5) is formed on the polymerized side surface of the film outer material (4).

Furthermore, the exterior material (A) sharing the display and pattern made of aluminum 1I (2) is formed in advance before polymerization of the plastic film outer material (4).

Specific manufacturing examples are shown below.

Example ■ An aluminum layer (2) is deposited on one side of a heat-shrinkable plastic film lining (1) made of transparent hard vinyl chloride with a thickness of 40 microns, and an acrylic acid-based ultraviolet curing type is applied to this aluminum layer (2). After applying the adhesive (3) and drying it, a heat-shrinkable plastic film outer material (4) made of transparent hard vinyl chloride with the same thickness as the lining material (1) is layered and roll-pressed, followed by UV irradiation. The adhesive (3) was reacted and cured to produce the exterior material (A) shown in FIG. 1.

The layer thickness of the adhesive (3) in this exterior material (A) is approximately 3
micron, and its adhesive strength is 0.7Ky/peel force.
It was al.

Note that, prior to forming the aluminum layer (2) by vapor deposition, one side of the film backing (1) was subjected to plasma irradiation treatment to increase the adhesion of the aluminum vapor deposition.

Example ■ A printed part (5) of yellow transparent ink, black ink, etc. is formed on the outer material (4) of a heat-shrinkable plastic film made of transparent hard vinyl chloride with a thickness of 40 microns, while the same thickness as the outer material (4) is formed. One side of the transparent hard PVC heat-shrinkable plastic film lining (1) is treated with corona discharge to increase the adhesion of aluminum, and then the aluminum layer (2) is applied.
is formed by vapor deposition, and an adhesive (3) made by dissolving vinyl chloride resin in a solvent is applied to this aluminum layer (2).
Dry with ventilation at a temperature below 40°C. And glue (3
) still has some tackiness, attach the film outer material (4) with its printed part (5) side to the adhesive (3), press it with a roll at 40°C, and cool it. , the exterior material (A) shown in FIG. 2 was manufactured. The solvent for the adhesive (3) is MEK, which is absorbed and diffused into printing ink and hard vinyl chloride.

A mixture of toluene and cyclohexane was used.

The layer thickness of the adhesive (3) in this exterior material (A) is approximately 5 microns in a dry state, and its adhesive strength is due to the trace amount of solvent remaining in the adhesive (3) after completing roll crimping. It is absorbed by the printing ink and vinyl chloride film and gradually diffused, improving the strength of the adhesive.
However, after being left at room temperature for 24 hours, it became 0.5.
It was uploaded to 9/-. In the printing part (5), the transparent yellow ink part (5a) becomes golden yellow, and the non-printing part (5
b) was used for the metallic luster color of the aluminum layer (2), that is, silver, and the black ink portion (5C) was used for the black color without metallic luster.

The shrinkage rate of the exterior material (A) manufactured in this way is when the film lining (1) and the film outer material (4) are made of vinyl chloride, and there is no substantial shrinkage at temperatures below 50°C, similar to conventional products. However, it had a shrinkage rate of 50% or more at temperatures of 80° C. or higher, which was a significant difference from conventional products, which had a shrinkage rate of less than 50% at the same temperature. (Fig. 5) (Effects of the Invention) Therefore, the present invention has the following advantages.

■ Because the aluminum layer is sandwiched and protected by heat-shrinkable plastic films on the front and back,
It can maintain a beautiful metallic luster for a long period of time and has excellent electrical insulation properties, making it useful for electrical purposes.

■ It has excellent heat shrinkability and no worries about wrinkles, so it has high commercial value.

■ The printed section is also protected and displayed.

The pattern can be made permanent.

■ Having the above-mentioned advantages (2) to (3), it can be reliably and stably manufactured and mass-produced at low cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 4 are sectional views showing each embodiment of the exterior material of the present invention. FIG. 5 is a comparative diagram showing the relationship between temperature and shrinkage rate of the exterior material of the present invention and a conventional product. In the figure, (A) is the exterior material (1) is the heat-shrinkable plastic film lining (2) is the aluminum layer (3) is the adhesive (4) is the heat-shrinkable plastic film outer material (5) is the printing department patent applicant Shin-Etsu Chemical Co., Ltd. Figure 1 Figure 2 Figure h Figure 3 Figure 4

Claims (1)

[Claims] [1] An aluminum layer is formed by vapor deposition on one side of a heat-shrinkable plastic film lining, and a heat-shrinkable plastic film outer layer is polymerized using a low-temperature curing adhesive as a medium on this aluminum layer. Exterior material made of [2] The exterior material according to claim 1, wherein the plastic film is made of heat-shrinkable hard vinyl chloride. [3] The optional exterior material according to claim 1 or 2, wherein the plastic film outer material has a printed portion on the side surface that is polymerized with the adhesive. [4] The exterior material according to claim 1, wherein the aluminum layer has an appropriate shape and pattern. [5] The exterior material according to claim 1, wherein the adhesive is a photocurable adhesive. [6] Form an aluminum layer by vapor deposition on one side of a heat-shrinkable plastic film lining, then apply a low-temperature curing adhesive to the aluminum layer, and then apply a heat-shrinkable plastic film using the adhesive as a medium. A method for manufacturing an exterior material, characterized by forming a film outer material by polymerization in a pressure-bonded manner. [7] The production of the exterior material according to claim 6, characterized in that the printed portion of the heat-shrinkable plastic film outer material is preprinted on the polymerized side surface of the heat-shrinkable plastic film before being pressed with the adhesive. Method. [8] The aluminum layer is formed into an appropriate shape and pattern by partially removing an appropriate layer portion of the aluminum layer before being pressed against a heat-shrinkable plastic film outer material. The method for manufacturing an exterior material according to item 6.