JPH07137200A - Compound plastic product with wood vein pattern on surface - Google Patents

Abstract

PURPOSE:To provide a compound plastic product which can be mass-produced at low cost and is highly durable with a superb wood vein pattern on the surface. CONSTITUTION:A compound plastic product with a wood vein pattern on the surface consists of a thin natural wooden board, on the surface, which is supported by a thermally curable resin layer on the rear and is formed with the resin layer in one piece. In addition, a transparent thermally curable resin coat is formed on the surface of the thin natural wooden board.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel composite plastic product having a grain pattern on its surface.

[0002]

2. Description of the Related Art Wood-grained materials are often used for interiors of buildings, vehicles and the like, furniture and furniture for desks, counters, tables and the like. These materials may be natural wood, or may be plastic or metal with woodgrain printing or painting, but the surfaces of the parts attached to these woodgrain materials have the same woodgrain. It goes without saying that it is desirable.

For example, if the interior of the decorative board of a wall outlet is woodgrain, there is a demand for this decorative board to also have a woodgrain. However, it is difficult to obtain a practical decorative board until now. Those cut out from natural wood are fragile and too expensive, and those with a woodgrain print on a plastic or metal plate or a plastic sheet with a wood pattern are problematic in terms of durability.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and can be mass-produced and manufactured at low cost.
It is intended to provide a composite plastic product having a surface wood grain excellent in durability.

[0005]

In order to achieve the above object, the composite plastic product of the present invention has a natural wood thin plate on the surface, and the thin plate is supported by a thermosetting resin body on the back surface and the resin body is It is characterized by being integrally molded with.

[0006]

The thin natural wood plate may have a thickness of about 0.2 to 0.3 mm, and it is suitable to cut it from a log. In the product of the present invention, the thin plate and the thermosetting resin plate are overlapped and integrally molded into a desired shape, and the natural wood thin plate on the front surface is supported by the thermosetting resin body on the back surface.

[0007] in order to retain the durability of the product is obtained to use a thermosetting resins. The type of the resin is not particularly limited, and may be any of phenol / formaldehyde resin, urea / formaldehyde resin, melamine / formaldehyde resin, unsaturated polyester resin, epoxy resin, silicon resin and the like.

In the case of integral molding, a resin compound which has not been completely cured is preliminarily molded into an approximate shape, and when heated during integral molding in a mold, the resin is impregnated into the natural wood thin plate. It is possible to obtain a product in which a natural wood thin plate is firmly adhered to a cured resin body after being adjusted to a desired shape and undergoing a curing reaction.

When the surface shape of this composite plastic product is three-dimensional, it is desirable to preform a thin natural wood plate before integral molding. In this preforming, first cut out a thin natural wood board to a size slightly larger than the specified size, and make a cut at the corner to prevent wrinkles from entering during molding.
After being moisturized, it is press-molded in a preform mold made of ceramics, then finish-molded in a similar heated mold, and then dried. It is advisable that the preforming die has a slightly larger size in consideration of the shrinkage of the thin natural wood plate during drying.

For such integral molding of the thin natural wood plate and the resin, it is preferable to use a pair of upper and lower molds having a cavity of a desired shape and having a built-in heating device. A natural wood thin plate is placed in the lower mold cavity of the mold heated to a predetermined temperature, an uncured resin molded body of a predetermined weight is placed on the thin plate, and the upper mold is clamped and held for a predetermined time. The resin is cured simultaneously with molding. It is desirable that the surface dimension of the uncured resin molded body is approximately 90% or more in area ratio with respect to the dimension of the final surface. If it is less than 90%, the friction with the natural wood sheet is large when the resin spreads in the cavity before curing,
This is because the thin plate may be torn.

In this way, a composite plastic product having a natural wood thin plate on its surface can be obtained. However, if the surface of the thin plate is not impregnated with resin, the surface gloss becomes insufficient. In such a case, it is advisable to carry out the surface treatment using the above-mentioned mold as it is. This surface treatment can be performed with a thermosetting resin that becomes a transparent resin film after curing. That is, since the composite product can be brought into close contact with the upper mold once the integrated molding mold is opened, the required amount of liquid resin raw material is put into the empty lower mold cavity together with the curing agent, and the mold is clamped again. The resin is applied to the surface of a natural wood thin plate, impregnated and cured.

The surface treating resin is preferably of the same type as the resin body of the product support, but is not limited thereto. The reason why the liquid is used as the surface treatment resin is that it is a good part for uniformly coating the surface of the product. Since this coating film is sufficiently thin, it does not take so long to cure.

Since a molded product taken out from the mold usually has a resin burr at the mold joint, it is removed to obtain a product. In this composite plastic product, the grain of natural wood is recognized through the transparent surface-treated resin coating, which not only gives a high-grade feeling, but also because the grain is protected by the resin coating, it is also durable and has a low manufacturing cost. Is slightly higher than ordinary plastic products, and can be put to practical use.

[0014]

EXAMPLE A 12 mm long × 7 mm wide × 7 mm high decorative plate for a wall double outlet was prototyped with the structure of the present invention. This decorative plate has a shape in which the ends of four sides are curved to the back side, and the thickness is 2.5 mm at the maximum. Prepare a mold that can be molded into this shape, and use a natural wood thin plate with a thickness of 0.2 mm and 110
An uncured unsaturated polyester resin compound molding plate having a length of 65 mm, a width of 65 mm, and a thickness of 2 mm was used as a raw material.

The thin natural wood plate is cut into a length of 130 mm × 80 mm, four corners corresponding to the curved portion are cut at right angles, immersed in warm water, molded with a preform mold made of ceramics, and then finished with a heated mold. Was preformed and dried.

The mold is heated to 120 to 130 ° C., the preformed natural wood thin plate is placed on the lower mold, the unsaturated polyester resin molded plate is placed on the lower mold, the upper mold is lowered, and the mold is clamped. After that, curing was performed for 3 minutes. When the upper mold is lifted after curing, the cured molded product comes in close contact with the upper mold and rises. In the hollow lower mold cavity, 10 g of unsaturated polyester resin liquid was mixed with a curing agent, and the mold was quickly clamped and cured for 1 minute. Then, the cured molded body was taken out and burrs were removed. Composite plastic products.

The obtained product was finished on a beautiful decorative board having a glossy wood grain pattern on its surface. This decorative board had heat resistance and sufficient moisture resistance.

[0018]

Industrial Applicability According to the present invention, it is possible to provide a wood grain composite plastic product having good durability at low cost.

Claims (2)

[Claims] 1. A surface wood grain composite plastic product having a natural wood thin plate on the surface thereof, the thin plate being supported by a thermosetting resin body on the back surface and being integrally molded with the resin body. 2. The surface woodgrain composite plastic product according to claim 1, wherein a transparent thermosetting resin coating is applied to the surface of the natural wood thin plate.