JPS6153098A - Decorative molded shape 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 relates to a three-dimensional three-dimensional plastic molded product having a partially opening pattern, and a method for manufacturing the same. It is particularly applicable to molded products such as radios, televisions, video and audio products, automatic instrument panels, console boxes, furniture interior parts, stationery, toys, etc.

[Conventional technology]

Conventional methods for forming patterns on three-dimensional molded products include ■Usually called the suminagashi method, in which resin pellets for molding molded products are
There are two typical methods: hot stamping, in which a film with a pattern is transferred to a molded product under heating conditions, using extrusion molding using colored pellets in three colors. . The above method (2) has the problem that only an unspecified random pattern can be obtained due to the flow state of the resin during extrusion molding, and the pattern lacks reproducibility and planning. In addition, although the method (■) has the reproducibility and planning ability of the pattern, it is generally transferred using roll pressure or flat pressure using rubber, etc., so the molded product consists of a flat shape or a three-dimensional shape with a large curvature close to a flat state. It was limited to things.

[Problem that the invention seeks to solve]

For this reason, in recent years, in order to solve these problems, ■ After vacuum forming a film with a pattern close to the shape of the desired three-dimensional molded product, the vacuum-formed product is set in the mold of the three-dimensional molded product and then injected. A method in which the molded product and the vacuum-formed film are integrated by molding, or a method in which the vacuum-formed film is given releasability and only the design is transferred to the molded product using the same method. A method has been used in which a pattern is printed on a film and the pattern is transferred to a molded product under water using water pressure. However, in method (2) above, when vacuum forming the film into the shape of the molded product, consideration must be given to the heat shrinkage of the formed film, and high precision is required in the design of the vacuum molding die, making it difficult to create molded products with complex shapes. is technically quite difficult. In addition, the method (2) has the problem of lacking stability in mass production because the step of transferring the pattern to the molded product under water using water pressure is handwork.

[Means for solving problems]

In order to solve each of the problems of the above-mentioned methods (1) to (2), a method for applying cosmetics to molded products according to the present invention was invented by applying the principles of vacuum forming and pressure forming. First, a comparison between methods ① to ① and the method according to the present invention will be described.

Regarding the reproducibility and planning of the picture pattern, which is a problem with the method (2), since the method of the present invention prints the picture pattern on a thermoplastic film, especially when using normal multicolor gravure printing, the picture pattern is multicolored and Patterns can be reproduced. In method (2), even if the molded product is pressed with a roll made of elastic rubber or a shape close to the shape of the molded product, the molded product may have a partially convex or four-part shape, or a surface shape with a small curvature. cannot be transcribed. On the other hand, in the present invention, the molded product is vacuum-formed in advance to a state that approximates the shape of the molded product, and then the pattern is transferred by applying the film to even the smallest details of the molded product using heated and compressed air. The problem is solved in this way.

Next, the highly accurate design of the injection mold and vacuum mold in the method (2) is not necessary in the method of transferring directly to the injection molded product using vacuum and compressed air.

Regarding mass production stability, which is a problem with method (■), this method has the advantage that once a vacuum and compressed air molding cycle can be established and set, it can be used continuously, and the same product can always be produced automatically. have. Next, the manufacturing process of the method for applying cosmetics to molded products of the present invention will be described using drawings. That is, the first step is to set the molded product in a molded product holder and heat the molded product, and the first step is to sequentially provide a release layer, a pattern layer, and an adhesive layer on a film that has vacuum formability facing the molded product. The second step is to install the film so that the adhesive layer and the molded product face each other, the third step is to place the film in a vacuum state on the molded product side and bring the film into contact with the entire surface of the molded product, and then mold the molded amount side under a vacuum state. A fourth step in which heated air is introduced from the top surface of the product, a fifth step in which after stopping the vacuum on the molded product side and heated air on the top surface of the molded product, the film is air-cooled and released from the molded product. A method for manufacturing a molded article in which a pattern is applied to a molded article, and a decorated molded article obtained by this method. In Figure 1 (
A) Onibi (B) is the transfer film of the present invention (A)
(1) is a film having Ilt type properties, and (2)
is a base film having vacuum formability, (3) is a mold release layer, (4) is a printed pattern, and (5) is an adhesive layer for the purpose of improving transferability to molded products. Also (mouth)
(1-) indicates a thermoplastic resin coating layer having mold releasability. This (1-) is a release layer to eliminate blocking between the adhesive layer and the base film surface when the transfer film is rolled up, and these films include films such as polyethylene, polypropylene, polyester, and nylon. is applicable. (2) Thermoplastic films such as polyvinyl chloride, 6-polystyrene, ABS resin, acrylic resin, polycarbonate, and acetate are used as the base film that is suitable for vacuum forming, and the thickness of the film depends on the shape of the molded product. This is a release layer for transferring from a film to a molded product, and is a layer that peels off due to interlayer peeling phenomenon during heat transfer, and chlorinated rubber or cyclized rubber is used.

It can also be formed into a layer of melamine resin, acrylic resin, etc. The printed picture pattern (4) is composed of colored ink selected according to the base film.Generally, multicolor gravure printing is optimal, but if necessary, offset, gravure offset, screen printing etc. also applies. Possible designs include picture patterns, wood grain patterns, marble patterns, cross-like patterns, abstract patterns, single colors such as gold, silver metallic colors, pearl colors, etc., or combinations thereof. Next, for the adhesive layer (5), heat-activated heat-sensitive adhesives such as ethylene-vinyl acetate copolymer, polyvinyl acetate, acrylic resin, and butyral resin alone or in combination can be used. Next, FIG. 2 is a schematic view showing the state before transfer of the present invention, and FIG. 3 shows the state after transfer.

(Function) The heated molded product and the transfer film are placed opposite each other in a chamber (divided into A and B by the transfer film), and the air inside the chamber is gradually removed while the air cylinder is raised. When this is done, the molded product comes into contact with the transfer film to form a general shape.Furthermore, when heated air is flowed into the chamber 0 and heated and pressurized, the pattern layer is thoroughly transferred to the surface of the molded product. It will be done.

Later, both chambers Δ and B are returned to atmospheric pressure and the base sheet is removed.

〔Example〕

Example 1 A peeling layer of chlorinated rubber and a pattern by gravure printing with vinyl chloride ink were applied to the polyvinyl chloride film surface of a film obtained by dry laminating a polyvinyl chloride film with a thickness of 200 μm or a polypropylene film with a thickness of 50 μm. A film is formed on which a solvent-soluble ethylene-vinyl acetate copolymer adhesive is coated on the entire surface.
The surface temperature of ABS resin is 150℃ for injection molded products of BS resin.
While maintaining the temperature at °C, set the film surface on the molded product, put the molded product side under vacuum, and mold it into the shape of the molded product. Immediately blow air at 80°C at 6 kg, 10 I, and 11 pressure from above to tightly bond the transfer film and the molded product. After that, the vacuum and pressurized conditions were released and the transfer film was released from the mold after air cooling.

A molded product with a picture pattern transferred to the molded product was obtained.

Example 2 In Example 1, a polyvinyl chloride film in which one side of the polyvinyl chloride film was subjected to plasma treatment was used.

After coating the untreated side with a low-temperature curing melamine resin and baking it at a low temperature, metal vapor deposition was performed on the melamine resin surface, and an acrylic adhesive was completely applied to the vapor-deposited surface to create a transfer film. By the same operation as in Example 1, a molded product having a glossy metal vapor-deposited surface on the entire surface of the molded product was obtained.

Example 3 Instead of the polypropylene film of Example 1, a two-component curing acrylic urethane resin was formed on the surface of a polyvinyl chloride film having a printed pattern. No release layer was provided on the side opposite to the printed surface, but an adhesive layer was provided.

By the same operation as in Example 1, a molded product was obtained by laminating a polyvinyl chloride film having a printed pattern on the molded product.

〔Effect of the invention〕

In the method of the present invention, after the transfer film is made to approximate the shape of the molded product using a heating vacuum method, in addition to this, a heating and pressure air method is also adopted, so that the pattern can be firmly transferred to even the detailed unevenness of the molded product. Moreover, since the air inside the mold is forcibly moved, the mold can be used continuously in a short cycle, making it possible to produce extremely efficiently.

[Brief explanation of the drawing]

FIGS. 1A and 1B are cross-sectional explanatory views of the transfer film l\ used in the present invention. FIG. 2 is an explanatory diagram showing the state before transfer according to the present invention. FIG. 3 is an explanatory diagram showing the state after transfer. 1... Release film 1-... Release coating layer 2... Paste fill 113... Release layer 4... Picture pattern layer 5... Adhesive layer 6
... Transfer film 7 ... Molded product

Claims (1)

[Scope of Claims] 1. A decorated molded product characterized in that an adhesive layer, a picture pattern layer, and a release layer are sequentially formed on the surface of the molded product. 2. A molded product is set in a molded product holder, and the molded product is In the first step of heating, a release layer, a pattern layer, and an adhesive layer are sequentially provided on a vacuum-formable film facing the molded product, and the film is placed so that the adhesive layer and the molded product face each other. 2nd step, the 3rd step is to put the molded product in a vacuum state and bring the film into contact with the entire surface of the molded product, then the 4th step is to put the molded product in a vacuum state and introduce heated air from the top surface of the molded product, molding A method for manufacturing a molded product, in which the vacuum on the product side and the heated air on the top surface of the molded product are stopped, and then the film is air-cooled to release the film from the molded product, and a pattern is decorated on the molded product through each of the above steps.