JPH0717003B2 - Method for manufacturing decorative product having uneven surface - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to the production of a decorative product in which a pattern is formed on the entire surface of an article such as a plastic molded article having a three-dimensional three-dimensional shape and partially having openings. In particular, the present invention is applied to molded articles for radio, television, video and audio cabinets, instrument panels of automobiles, console boxes, furniture interior parts, stationery, toys and the like.

(Prior Art) Conventionally, as a method of forming a pattern on a three-dimensional article, 2 to resin pellets for molding of a molded article which is usually called a sumi-fashi method is used.
Extruded and molded using 3 colored pellets.
A method in which a molded plastic film with a pattern is called a hot stamp and the molded product is transferred under heat. After vacuum forming a film with a pattern similar to the desired three-dimensional molded product, set the vacuum molded product in the mold of the three-dimensional molded product and injection molding to integrate the molded product and the vacuum molded film. Or a method in which only the design is transferred to the molded product by making the vacuum-molded film have releasability by the same method. There has been performed a method of transferring a design pattern by water pressure in water to a molded product, which is a film obtained by printing a design pattern on a film such as vinylon, which is called hydraulic transfer.

(Problems to be Solved by the Invention) In the conventional method as described above, it is possible to form a pattern on the surface of a molded product having an uneven surface, but the uneven surface, for example, a conduit groove of wood grain Such a shape could not be imparted.

In addition, if an uneven pattern is formed on the inner surface of the mold and resin is injected into it, engraving or the like must be used to form the uneven pattern on the surface of the molded product. It was not possible to form a realistic uneven pattern such as.

(Means for Solving Problems) The present invention faithfully reproduces the realistic texture, texture, and texture of natural products that cannot be obtained by the conventional methods as described above, and matches the pattern. It is intended to supply a three-dimensional decorative product having a genuine feeling that cannot be distinguished from a natural product.

That is, a concavo-convex pattern is formed on the thermoplastic resin film that can be laminated on the concavo-convex surface of the layered product having the concavo-convex surface,
The present invention relates to a technique of providing an uneven shape-retaining layer so that the uneven pattern does not change and then integrating the layer with a layered body having an uneven surface.

The present invention will be described in detail below with reference to the drawings.

First, as shown in FIG. 2, unevenness is formed on the surface of the thermoplastic resin sheet (1). The unevenness may be formed directly on the thermoplastic resin sheet, or a printed pattern layer may be formed on the surface of the thermoplastic resin sheet if necessary, and a resin layer capable of thermal softening may be formed thereon to form the resin. Roughness may be formed on the layer.
Of course, a printed pattern layer may be formed on the surface of the thermoplastic resin sheet, and the unevenness may be formed thereon.

As a means for forming irregularities, an embossing plate or embossing roll in which irregularities are formed by engraving or etching on the surface of a metal plate or a metal roll, or a plate or roll wound with an embossed sheet that is raised and printed on the surface of a sheet-like material, etc. Can be used, but if you use an embossed plate or embossing roll that is made based on an embossed sheet that has the surface shape of a natural product such as wood molded with a silicone resin, etc. Can be formed.

Next, a resin (2) having releasability with respect to the thermoplastic resin sheet (1) is applied to the concavo-convex forming surface of the thermoplastic resin sheet (1), and the resin (2) having releasability is applied. Completely fill the recesses to produce a laminating sheet (3).

Next, the laminating sheet is placed facing the layered body in a closed chamber to heat and soften the layering sheet, the side of the layering sheet on which the layered body is present is vacuum-sucked, and the other side of the sheet is laminated. By air-pressing on the side of, the object to be laminated (4) and the laminating sheet are integrated as shown in FIG.

Finally, as shown in FIG. 1, a resin (2) having releasability.
If is removed, a molded product having a real uneven pattern on the surface can be obtained.

As the thermoplastic resin sheet (1), polyvinyl chloride sheet, polyethylene sheet, polypropylene sheet, polyester sheet, nylon sheet, ABS resin sheet,
Polyimide sheet, acrylic sheet, polyvinyl acetate sheet, vinylidene chloride sheet, fluororesin sheet, polycarbonate sheet, synthetic paper or non-woven fabric using the above various resins, and a sheet obtained by combining any of the above sheets in combination, and the like. Can be used. A printed pattern layer may be formed on the surface of the sheet as described above, or a colored sheet may be prepared by mixing a coloring agent into the sheet.

The resin (2) having releasability has releasability with respect to the thermoplastic resin sheet (1) to be used and has high heat resistance, and moreover, the concave portion on the surface of the thermoplastic resin sheet (1) is completely removed. It must have sufficient fluidity so that it can be filled in.Specifically, from polypropylene resin, polyester resin, polyethylene resin, polyvinyl chloride resin, etc., select one suitable for the resin used for the thermoplastic resin sheet. To use.

As the layered body (4), a resin molded product molded by injection molding, extrusion molding, or the like can be used, but of course, a woody material formed in an uneven shape by cutting or the like can also be used.

In the concave portion formed on the surface of the thermoplastic resin sheet (1),
It is also possible to embed a coloring material by the wiping method,
Further, a resin having releasability may be applied after the surface protective layer is formed on it.

(Function) The thermoplastic resin sheet is softened and easily deformed by the heat of heat softening when it is attached to the layered body and the heat applied when molding the resin, but the recesses on the surface of the thermoplastic resin sheet are Since it is completely filled with the resin having the releasing property, it is not deformed, and the real concavo-convex shape given at the time of embossing is reproduced as it is on the surface of the decorative product.

(Effect of the invention) Since the sheets having the realistic unevenness pattern formed on the surface are laminated, a decorative product having a high design property can be obtained.

Since unevenness is formed in advance on the sheets before lamination, it is possible to use an electroforming plate with high reproducibility and a high-frequency molding method that is low in cost, and it is possible to inexpensively manufacture a product that more closely resembles a natural product. it can.

(Example) A colored ABS resin sheet having a thickness of 0.4 mm was provided with an oak grain pattern by a gravure printing method, and an uneven pattern was formed on the surface thereof by using an embossing roll. The embossing roll used was one in which an electroforming plate made from natural wood having an oak grain pattern was stuck to the roll surface.

Next, a coloring material is embedded in the concave and convex portions by a wiping method, and a urethane resin is further applied to the entire surface of the sheet with a gravure coater and dried, and then a polyvinyl alcohol resin is applied to the entire surface of the sheet so that the convex surface has a thickness of 100 μm. So as to completely fill the recesses and dry to obtain a laminating sheet.

Next, the console box molded product made of ABS resin and the laminating sheet are placed facing each other in a closed chamber, and the laminating sheet is heated to a surface temperature of 130 ° C. to soften the sheet. Then, the side of the sheet on which the molded article is present is vacuum-sucked, and the other side of the sheet is air-pressed to bond the laminating sheet to the surface of the molded article, and then the polyvinyl alcohol resin layer is removed. , Got a decorative product.

[Brief description of drawings]

The drawings are for explaining the method of the present invention. Fig. 2 shows the structure of a laminating sheet, Fig. 3 shows a state in which a laminating sheet is attached to the surface of a molded product, and Fig. 1 has releasability. It is sectional drawing which shows each state which removes resin. (1) …… Thermoplastic resin sheet (2) …… Releasable resin (3) …… Laminating sheet (4) …… Laminating object

Claims (1)

[Claims] 1. A first step of forming irregularities on a surface of a thermoplastic resin sheet. A second step in which a resin having releasability with respect to the thermoplastic resin sheet is applied to the irregularity-formed surface to completely fill the recesses to produce a laminating sheet. A third step of installing the laminating sheet in a vacuum chamber so as to face the object to be laminated. The laminated sheet is heated and softened, the side of the laminated sheet on which the laminated body is present is vacuum-sucked, and the other side of the sheet is compressed to integrate the laminated body and the laminated sheet. Fourth step. A fifth step of removing the resin having releasability from the surface of the sheet. A method for manufacturing a decorative product having an uneven surface, comprising the above steps.