JPH0330921A - Method for molding resin molded item having wooden overlay sheet as surfacing material - Google Patents

Abstract

PURPOSE:To obtain apparently realistic woody texture and contrive to enhance the productivity and to reduce the production cost of the molded item concerned through the reduction of the number of processes by a method wherein both the shaping of a curved real wood and the injection molding of a mounting member are performed simultaneously and both the wood and the member are bondingly integrated at the molding. CONSTITUTION:Firstly, a wooden overlay sheet 1 and a protective plate 2, which comes into contact with the back of the sheet 1 and on both sides of which adhesive is applied, are set to a cavity 41a. The holding of the sheet and the plate for setting is performed by provisionally fixing to the cavity part through the suction under vacuum 41b. Injection molding is performed by injecting thermoplastic synthetic resin to the nozzle touching part of a retainer plate 43 after mold closing. The resin is injected through the sprue 43a of the retainer plate 43 to the runner 41c of a cavity main body 41 and further through the gate pole 42a of a movable retainer plate 42 to the rear side of the protective plate 2. At this time, the wooden overlay sheet 1 and the protective plate 2 are fixed by pressure to the cavity of the cavity main body 41 so as to be integrally bonded together and, at the same time, to be shaped in the predetermined surface form by the cavity. Simultaneously, a mounting member 3 is injection molded on the rear side of the protective plate 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for molding resin molded parts using wood boards as the surface material, which are used for car parts interior parts, furniture furnishings, and the like.

[Prior Art] Interior parts such as dash boards for automobiles, cabinets for various types of equipment, and furniture furnishings are preferred to have woodgrain patterns applied to their surfaces to create a luxurious atmosphere.

Conventional woodgrain decoration methods include, for example, a method of printing woodgrain on the surface of a synthetic resin molded product, a method of placing a synthetic resin sheet with woodgrain printing in a mold, injection molding the synthetic resin, and melt-bonding it. Alternatively, a method is known in which a separately formed synthetic resin molded product is attached with adhesive to plywood made of real wood (for example, Japanese Patent Publication No. 57-7899, Japanese Patent Publication No. 55-59942). Publication No., Special Publication No. 1983-95
Publication No. 922).

[Problem R to be solved by the invention] Among the above-mentioned conventional techniques, in those in which wood grain printing is applied to the surface of a synthetic resin molded product, it is difficult to obtain a good wood texture in appearance, and the synthetic resin with wood grain printing is difficult to obtain. Similarly, when sheets are insert-molded, a realistic wood texture cannot be obtained, while when bonding plywood and synthetic resin molded products, the resin molding process and gluing process are separate processes, resulting in productivity problems. There were problems in that the performance decreased and the cost increased.

The present invention was made in order to eliminate all of the problems of the conventional methods, and provides a wood texture that is excellent in appearance.
The technical objective is to provide a method for molding resin molded parts using wood boards as the surface material, which improves productivity and reduces costs by reducing the number of steps.

[Means for Solving the Problem] As a means for solving this technical problem, the present invention provides a method for injection molding a wooden board or several wooden boards pre-coated with a thermosetting adhesive. At the same time, the wooden board is shaped into a predetermined shape by the mold, and the wooden board and the mounting member are integrated by bonding. The gist is the method.

[Function] By using a wooden board as a surface component, a realistic wood texture can be obtained in appearance, and at the same time as the injection molding of the mounting member, the wooden board is shaped into a predetermined shape (if there are several wooden boards, shaping and gluing are possible). ), and the wooden board and the mounting member can be integrated with adhesive.

[Examples] The present invention will be explained in more detail below with reference to illustrated examples.

In FIG. 1, reference numeral 1 denotes a wood decorative board, which is formed from a veneer of precious wood of an appropriate thickness, and a protective board 2 is attached to the back surface of this wood decorative board 1 via an adhesive 2a. The mounting member 3 is formed from synthetic resin on the back side, and the entire structure is formed into a predetermined shape during injection molding of the synthetic resin.

A component having such a configuration can be manufactured using an injection molding machine 4 as shown in FIG. That is, first, the protective plate 2 is set in the cavity 41a of the cavity main body 41, and the protective plate 2 is placed on the back surface of the wooden decorative board 1.
Adhesive is applied in advance. The wooden decorative board 1 and the protective board 2 are held as a set by temporarily fixing them to the capitivity part by vacuum suction 41b. Reference numeral 42 denotes a movable mold plate, which forms a predetermined part shape together with the cavity main body 4I, and has a gate ball 42a for injecting synthetic resin on the back side of the protection plate 2, and extrudes the part after injection molding. A push-out bottle 42b is provided for this purpose.

Reference numeral 43 denotes a stationary mold plate, which has a spool 43a, which is connected to the runner 41c of the cavity main body 41. 44 is a support block for the movable template, and 45 is a mounting plate for the movable template 42.

Injection molding by the injection molding machine 4 is performed by injecting a thermoplastic synthetic resin into the nozzle touch portion of the stationary template 43 after the mold is clamped. The injected synthetic resin flows from the spool 43a of the stationary mold plate 43 into the runner 41c of the cavity main body 41, and is further injected from the gate ball 42a of the movable mold plate 42 to the back side of the protection plate 2. . At this time, the wood decorative board 1 and the protection board 2 are pressed into the cavity of the cavity main body 41 and integrated with adhesive, and are shaped into a predetermined surface shape by the cavity, and the back side of the protection board 2 The mounting member 3 is injection molded. Thereafter, the mold clamping is released, and the resin molded part 5 is taken out from the mold by the push-out pin 42b of the movable mold plate 42, and such a cycle is continuously repeated.

Next, the resin molded part 5 enters a finishing process, in which the hanging gate ball 51 is cut off from the root, the front periphery 52 is neatly trimmed,
After holes are made in the necessary places, the surface of the wood decorative board 1 is finished with a finishing coat.

The resin molded part 5 formed in this way has a wood decorative board 1 on its surface, so it has a realistic wood feel, and the back side of the wood decorative board 1 is lined with a protective board 2, so it is strong. Since it has a strong structure and is formed into a predetermined shape, it can be easily incorporated into equipment etc. via the mounting member 3.

A plurality of wooden boards may be used instead of the above-mentioned wooden decorative boards 1, but in this case, if a thermosetting adhesive is applied to the plurality of wooden boards in advance, the above-mentioned mounting By thermocompression bonding during injection molding of the member 3, a plurality of wooden boards can be bonded together while being shaped into a capitular shape. In this case, the protection plate 2 can be omitted.

Although not shown, wood decorative board (0.2 to 0.5
■Thickness) to form a curved surface, aluminum foil (0.1 to 0.1
5mm thick), but when insert molding using this, it is necessary to thermally spray aluminum with a thickness of about 50 to 100 J+* on the aluminum foil surface to strengthen the adhesion with the synthetic resin. This is advantageous because the mechanical anchor effect of resin adhesion can be achieved.

[Effects of the Invention] As explained above, according to the present invention, there is a method of simultaneously performing curved surface shaping of real wood and injection molding of a mounting member, and bonding and integrating the real wood and the mounting member during the molding. Therefore, the finished parts have a realistic wooden appearance due to the wooden surface, and the number of manufacturing steps can be reduced, resulting in improved productivity and reduced costs.

[Brief explanation of drawings]

FIG. 1 is an exploded front view of a resin molded component according to the present invention;
FIG. 2 is a configuration diagram of a mold of an injection molding machine for manufacturing the resin molded part, and FIG. 3 is a front view of the injection molded resin molded part. 1... Wood decorative board 2... Protective plate 3... Mounting member 4... Injection molding machine 5... Resin molded parts

Claims (1)

[Claims] A single wooden board or several wooden boards pre-applied with thermosetting adhesive are placed in an injection mold, and synthetic resin is injected onto the back side of the wooden board to form the mounting member. A method for forming a resin molded part using a wooden board as a surface material, characterized by shaping the wooden board into a predetermined shape using a mold, and bonding and integrating the wooden board with the mounting member.