JPH0330922A - Composite component of wooden overlay sheet and synthetic resin - Google Patents

Abstract

PURPOSE:To obtain apparently realistic woody texture, eliminate the need of surface painting and consequently contrive to enhance the productivity and to reduce the production cost of the composite component concerned by a method wherein both synthetic resin layer on the rear of a wooden overlay sheet and transparent synthetic resin layer on the front surface of the wooden overlay sheet are integrally injection- molded. CONSTITUTION:A wooden overlay sheet 1 is set to a primary side cavity 56 in such a manner that the wooden overlay sheet 1 is abutted against a stationary mold 56b so as to face the front surface of the sheet to a cavity part in order to be provisionally fixed to the cavity part through the suction under vacuum 56b from the cavity part side. After that, mold clamping process is performed with a mold clamping cylinder and then a primary and a secondary injection moldings are performed simultaneously. In the primary side cavity 50, synthetic resin is injected from a primary side injection unit through the gate pole 56d of a movable mold 56c so as to form a synthetic resin layer 2 on the rear side of the wooden overlay sheet 1. In the secondary side cavity, a transparent synthetic resin layer 3 is injection-molded on the front surface of the wooden overlay sheet 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composite component of a wood decorative board and a synthetic resin.

[Prior Art] Cabinets and furniture for various types of equipment are preferred to have woodgrain patterns on their surfaces, and synthetic resins have been used as a way to decorate the woodgrain patterns.

The products include, for example, a synthetic resin molded product with wood grain printed on the surface, a synthetic resin sheet with wood grain printed placed in a mold, synthetic resin injection molded and melt-bonded,
Alternatively, a separately formed synthetic resin molded product is adhered to a plywood made of real wood using an adhesive, and the surface of the plywood is painted.

[The problem that the invention attempts to solve! ! l] Among the conventional products mentioned above, those in which wood grain printing is applied to the surface of the synthetic resin molded product have difficulty obtaining a good wood texture in terms of appearance;
Similarly, when insert molding a synthetic resin sheet with wood grain printed on it, a realistic wood texture cannot be obtained.
On the other hand, in the case of bonding plywood and synthetic resin molded products, there are problems in that the surface painting process reduces productivity and increases costs.

The present invention was made in order to eliminate all of the problems of conventional products, and provides a wood texture with a backward appearance.
The technical challenge was to provide a wood-grained synthetic resin composite product that does not require a surface painting process.

[Means for Solving the Problem] As a means for solving this technical problem, the present invention provides a decorative wood board, a synthetic resin layer formed by injection molding on the back side of the decorative wood board, and a synthetic resin layer formed by injection molding on the back side of the decorative wood board. The gist of this product is a composite component of a wood decorative board and a synthetic resin, which are integrated with a transparent synthetic resin layer formed by injection molding on the surface of the decorative board.

[Function] By inserting a wood decorative board, a realistic wood texture can be obtained in appearance, and by providing a transparent synthetic resin layer on the surface, there is no need for a post-processing painting process, improving productivity and reducing costs. It is possible to aim for

Furthermore, a desired curved surface can be shaped using a mold during injection molding.

[Example] Hereinafter, the present invention will be explained in more detail with reference to illustrated examples.

In FIG. 1, 1 is a wood decorative board, which is formed from a decorative veneer of an appropriate thickness or a veneer of precious wood, and this wood decorative board 1
A synthetic resin layer 2 is provided on the back surface, and a transparent synthetic resin layer 3 is provided on the front surface. In addition to being used alone, the wood decorative board 1 may be lined with a protective plate (not shown) if it is very thin.

The composite component 4 according to the present invention configured as described above is
It can be manufactured using a two-layer injection molding machine 5 as shown in FIG. This two-layer injection molding machine 5 has a primary and secondary injection unit (51152) on both sides, and a rotating platen 55 that can rotate 360 degrees in the horizontal direction between a movable platen 53 and a fixed platen 54. Therefore, the composite component 4 can be manufactured continuously in the standard operation mode shown in FIG.

That is, first, in the setup step, only the negative side is injection molded and the rotary platen is rotated 180 degrees. In this next-side injection molding, the wood decorative board 1 is set in the next-side cavity 56. As shown in Fig. 4, the setting method is to bring the wood decorative board 1 into contact with a fixed mold 58a with its surface facing the cavity, and then vacuum suction 56b from the cavity side to temporarily set it. This is done by stopping. At this time, if the protective plate is to be lined, the protective plate coated with adhesive is attached to the back surface of the wood decorative board 1.

Thereafter, a mold clamping step is performed by the mold clamping cylinder 58, and injection molding is performed simultaneously in the primary and secondary moldings. - In the next cavity 56, as shown in FIG.
Synthetic resin is injected from the next side injection unit 51 through the gate ball 5 [i'd of the ec, and the wood decorative board 1
A synthetic resin layer 2 is formed on the back side. At this time, if the protective plate is present, the step of adhering it to the wood decorative board 1 is performed at the same time. In the secondary cavity 57, the transparent synthetic resin layer 3 is injection molded on the surface of the wood decorative board 1.

This makes it possible to continuously perform injection molding by changing the position of the rotary platen 55 without having to remove it from the mold each time.

Finally, the mold is opened and only the secondary product is ejected from the mold, and the rotary platen 55 is rotated 180 degrees to complete one cycle. Therefore, by repeating such steps, the composite component 4 can be manufactured continuously.

In the composite component 4 formed in this way, the wood decorative board 1 can be clearly seen through the transparent synthetic resin Ji 13 on the surface, so it can be finished with a realistic woodgrain appearance,
Since the synthetic resin layer 2 is provided on the back side of the wood decorative board 1, it has a strong structure in terms of strength. Furthermore, if the wood decorative board 1 is extremely thin, sufficient reinforcement can be achieved by lining it with a protective plate as described above.

Incidentally, the real wood decorative board is colored or painted in advance in order to give it a good appearance as a product. Furthermore, it is effective to coat the surface of the decorative wood board with a heat-resistant paint to prevent the wood decorative board from being exposed to the heat of the molten resin and becoming discolored or carbonized during the secondary injection process.

[Effects of the Invention] As explained above, according to the present invention, a synthetic resin layer is formed on the back side of a wood decorative board by injection molding, and a transparent synthetic resin layer is injection molded on the surface of the wood decorative board. Since they are integrated, a realistic wood-like appearance can be obtained, and there is no need to paint the surface, which has excellent effects such as improving productivity and reducing costs.

In addition, when lining a wood decorative board with a protective board, the process of adhering the protective board can be performed at the same time as the primary injection molding process, reducing the number of processes. Since it can be shaped into a shape, it is easy to meet demand, and it is possible to expect the use of composite components to expand.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional perspective view of a part of a composite component according to the present invention, Fig. 2 is an elevational view of a two-layer injection molding machine for manufacturing the composite component, and Fig. 3 is a standard operation of the molding machine. An explanatory view showing the mode, and FIG. 4 is a sectional view of the main part showing the state of wood decoration, where the board is placed in the mold. 1...Wood decorative board 2...Synthetic resin layer 3...Transparent synthetic resin layer 4...Composite component 5...Two-layer injection molding machine

Claims (2)

[Claims] (1) It is formed by integrating a decorative wood board, a synthetic resin layer formed by injection molding on the back side of the decorative wood board, and a transparent synthetic resin layer formed by injection molding on the surface of the decorative wood board. A composite component made of wood decorative board and synthetic resin. (2) A composite component of a wood decorative board and a synthetic resin according to claim (1), wherein a desired curved surface is formed by a mold during the injection molding.