JPS6140132A - Molding method of patterned piece - Google Patents

Abstract

PURPOSE:To save mold-changing hour and transfer a delicate pattern to a molded piece by fixing a hard, corrugated and detachable pattern plate of thermoplastic resin, free from deformation at molding temperature and molding pressure on part or the whole of the molding surface of a male or female mold base. CONSTITUTION:An undercut section 2 is provided on the mold base 1 to insert pattern plates 3, 4, which are held by holdfasts 5 through screws 6 etc. Woody molds, metallic molds, resin molds, plaster molds, etc. used in general pressure molding are applied to the mold base. The male mold or the female mold can be suitable for the mold base. If the pattern plate is detachable, the mold base can be used in common for the pattern plate in spite of the shape or the size of the mold base. The thermoplastic resin plate which does not cause deformation of pattern due to molding temperature and pressure molding is suitable as the hard pattern plate. For example, glass plates, metallic plates, thermosetting plates, slate, ceramics, etc. are engraved for use. When the pattern plate is fixed, it is necessary that replacement and detachment are easy and no removal and no displacement of the pattern plate is caused easily by pressure molding.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Industrial Application Field The present invention relates to a method for pressure forming a thermoplastic resin. 0(9) Conventional technology related to a method for forming a shape pattern Conventionally, in pressure molding of a thermoplastic resin plate, an uneven pattern and/or a three-dimensional image (abbreviated as a "picture") is formed on the surface of a molded product. When molding, a method has been used in which the pattern is engraved on the molding surface of a male or female mold blank, and the mold is molded using a mold in which the mold blank and the pattern are integrated. However, in recent years, there has been a strong trend toward high-mix, low-volume production of air-formed products such as lighting covers, and there has also been a strong demand for faster development of new products. .

Under these circumstances, if we prepared one mold for each 1li product as in the past, the mold manufacturing costs would be high, and it would take a long time to manufacture the molds, and we would not be able to meet market demands. Furthermore, the loss of mold change time associated with switching to a different product during molding cannot be ignored.

Furthermore, when engraving m#lI designs such as flowers and plants into commonly used wooden molds, resin molds, or plaster molds, the material is soft and easy to carve, and the carving itself is difficult. However, problems such as compressed air molding crushes the shaggy engraved parts and makes it difficult to shape the molded product faithfully occur. By producing only one mold and the desired pattern board, it is possible to easily mold many kinds of patterned molded products, it eliminates the loss of mold change time, and it is delicate. The purpose of the present invention is to faithfully form a pattern into a molded product.Structure of the Invention The present invention is directed to forming a part or entire molding surface of a male mold or female mold blank in pressure molding of a thermoplastic resin plate. Attaching a removable pattern plate having a hard uneven pattern and/or a three-dimensional image that does not deform due to the molding temperature and pressure of the thermoplastic resin plate forms the pattern on a part or the entire surface of the molded product. The present invention relates to a method for molding a patterned molded product, which is characterized by the following.

The mold base used in the method of the present invention may be a wooden mold, metal mold, resin mold, two plaster molds, etc. used in general pressure molding, and may be either a male mold or a female mold, and the pattern plate is removable. As much as possible, even if the shapes and sizes of the mold materials are different, the mold materials can be used in common for the pattern board. The hard pattern board may be made of any material that does not deform the pattern due to the molding temperature and pressure molding of the thermoplastic resin board, such as glass plates, metal plates, thermosetting resin plates, slate, ceramics, etc. engraved. Glass plates and metal plates are preferable when creating very fine or finely sharp patterns such as floral designs or plants. Rubber, soft PV that is easily deformed by
c.

Foams and the like are not preferred because they deform and make it difficult to faithfully form a pattern on the surface of the molded product.

The shape of the pattern board may be a flat plate or one with curvature, but it must be able to be attached to the mold base and have a shape and thickness that will not be damaged by air pressure forming.The method of attaching and fixing the pattern board is to replace and remove it. It is easy to use and can be easily removed by pressure molding as long as it does not shift in position. For example, attachment methods using commercially available double-sided adhesive tapes, adhesives, magnets, etc., and methods by fitting can be cited.

Specifically, an example of this will be explained with reference to Figure 1 (cross-sectional view) It can be installed with a stop. These mounting methods are not limited to these, but may be similar to the above-described mounting methods as long as the picture board can be easily replaced and removed in a short time.

The thermoplastic resin plates used in the present invention include polymethyl methacrylate sheets, polyvinyl chloride sheets, polycarbonate sheets, ABS sheets, and MS resin sheets, which are generally used in pressure molding.
Even if a thermoplastic resin plate such as an As sheet or a polyolefin sheet is used and is 9V bright or partially or completely colored, the molding conditions for carrying out the present invention are as follows:
Although the thermoplastic resin plate to be used can be selected as appropriate by those skilled in the art, the molding is generally carried out at a molding pressure of 2 to 8 degrees and a molding temperature of 100 to 210C.

(B) Examples Example 1 A glass picture board with a thickness of 5 cm, which is textured all over and has a three-dimensional pattern of a glossy pine tree engraved in the center, is 810 wax in length, @ 110 m. Cut the glass pattern into a size of I installed it with the pattern on the board ■ facing up.

Next, impact-resistant AC VIV resin plate (manufactured by Sumitomo Chemical Co., Ltd.:
A transparent board with a thickness of 2 days (product name: SUMIPEX IT) is 1
The molded product obtained by heating to 50°C and applying a pressure of 4V to air pressure molding.
The pine tree pattern d was faithfully shaped after the grain of the collapse.

In addition, in this implementation, we used the mold base and pattern board that we had on hand, so there was no need to make new ones, and the pattern board could be installed in 5 minutes, compared to the 2 to 8 months it would normally take to mold a new product. It was completed within one day.

Example 2 A glass pattern board made of pine and wood used in Example 1 was placed on two sides of the aluminum lighting cover mold body ■ shown in Figure 1 (cross-sectional view).
The entire surface is textured, and a three-dimensional bamboo tree pattern with a glossy finish is engraved in the center. Thickness: 5cm, length: 81mm
■.

A glass pattern board ■ with a width of 110 cm and edges slightly shaved diagonally was attached to the other two sides using a temporary pattern presser ■ and screws ■.

Next, a board with a thickness of 81 g was made of impact-resistant ac-vyv resin board (manufactured by Sumitomo Chemical Co., Ltd., trade name, Numipex HT) with a dairy cow.
It was heated to 50° C. and air pressure molded under pressure for four summers.

The obtained molded product has a lighting cover φ shown in Fig. 4 (perspective view), and a glass pattern 6, a pine tree pattern, and a bamboo tree pattern φ are faithfully formed on its side. It has been done,
When a fluorescent light was inserted inside and turned on, the pine and bamboo trees stood out in a very gentle way, giving the light cover an extremely textured appearance.

In addition, it took 15 days to make the mold and 5 days to make the picture board (■), and it took about 20 days to complete the project from planning to commercialization of the lighting cover (however, the picture board (■) was made using a ready-made product). ) However, it took three months to make a new mold in which the savage-like picture board and the mold were integrated. Effects of the Invention According to the method of the present invention, There is no need to create molds for each product design; if you only make one mold base and the desired design board, you can mold many types of molded products with patterns by replacing the design board, and you can change the design of the molded product. There is no need to change the mold each time, and changes can be made by simply replacing the pattern board while the mold body is still attached to the molding machine, reducing mold production costs, shortening the mold production period, and shortening the time for changing types. Since it can be easily shortened, it can be said that this forming method is especially suitable for high-mix, low-volume production.Also, if you want to shape a pattern engraved on a nearby glass plate into a lighting cover, you can use the glass plate. By cutting it to a predetermined size, attaching it to a square mold, and molding it, you can instantly obtain a lighting cover with the pattern of the glass plate formed on it.

[Brief explanation of the drawing]

Figures 1 and 2 show cross-sectional views of the mold blank, and Figures 8 and 4 show a patterned pressurized air molded product.0 Figure 8Figure 4

Claims (1)

[Claims] In air pressure molding of a thermoplastic resin plate, a hard uneven pattern and/or a hard uneven pattern that does not easily deform due to the molding temperature and pressure of the thermoplastic resin plate is formed on a part or the entire molding surface of the male or female mold base material. A method for molding a patterned molded product, which comprises attaching a removable pattern board having a three-dimensional image and forming the pattern on a part or the entire surface of the molded product.