JPH04175117A - Manufacture of design product made of resin - Google Patents

Abstract

PURPOSE:To enable molding of a design product having designed surfaces in various surface roughness, by a method wherein a film having a transfer surface in various surface roughness is prepared and the film is molded by arranging the same within a mold. CONSTITUTION:A film 1 having a transfer surface 10 having fixed surface roughness is held on a mold surface so that the transfer surface 10 faces on the inside of a cavity 32. Then molding is performed by casting resin within the cavity 32 after mold clamping, the film 1 is peeled off from a molded body after mold breaking and a design product 2 having a designed surface 20 in fixed surface roughness is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of manufacturing a designed article having a predetermined surface roughness shape by molding.

[Prior art] When molding a resin design product with a design surface such as a mirror surface or a grain pattern with various surface roughnesses, the surface of the transfer mold for molding the design surface is subjected to a predetermined grain or mirror finish. A common method is to transfer the surface roughness of the surface of the transfer mold to the molded product.

[Problems to be Solved by the Invention] However, as described above, in the method of performing various processing on the mold surface for molding, it is possible to manufacture a molded product with only one type of surface roughness from one mold. In order to manufacture molded bodies with various surface roughnesses, it was often necessary to manufacture a number of molds depending on the type. Therefore, the cost required for mold production is large, and in the case of high-mix, low-volume production, the number of man-hours required for mold replacement becomes large. The present invention has been made in view of these circumstances,
The purpose is to manufacture designed products with designed surfaces with multiple surface roughnesses using one type of mold.

[Means for Solving the Problems] A method for manufacturing a resin design product of the present invention that solves the above problems includes placing a film having a transfer surface of a predetermined surface roughness on a mold surface with the transfer surface facing into the cavity. A holding process in which the mold is held, a molding process in which resin is injected into the cavity after the mold is closed, and the film is peeled off from the molded body after the mold is opened, and the transferred surface is a design surface with a predetermined surface roughness. It is characterized by consisting of a peeling step to obtain a quantity.

In the holding step, a film having a transfer surface with a predetermined surface roughness is held on the mold surface. In this case, it is necessary to hold the transfer surface so that it faces into the cavity. As a method for holding this film on the mold surface, conventionally known means such as mechanical holding, static electricity adsorption, or negative pressure such as vacuuming can be used.

In the molding process, a molded body having a predetermined shape is molded using the film as an insert. It is desirable that the resin used here has poor adhesion to the film.

Conversely, it is desirable to select a material for the film that has poor adhesion to the resin that makes up the main body of the design. This molding method can be selected from compression molding, transfer molding, injection molding, etc.

The peeling step is a step of peeling the film from the obtained molded body. The surface roughness of the transfer surface is transferred to the surface of the molded body that is in close contact with the transfer surface of the film. Therefore, by peeling off the film, the inverted shape of the transferred surface is transferred to the surface of the molded article, and a designed amount having a designed surface with a predetermined surface roughness is formed.

The film may be peeled off manually after the molded body is released from the mold, or when the film is mechanically held in the mold, it may be peeled off at the same time as the mold is opened.

The design of the transfer surface of the film is determined by the film manufacturing method (
By adjusting the methods (shot blasting, roller transfer, chemical treatment), transfer surfaces with various designs can be easily formed.

[Operations and Effects of the Invention] Therefore, in the method for producing a resin design object of the present invention, films having transfer surfaces with various surface roughnesses are prepared, and the film is simply placed in a mold and molded. , it is possible to mold design quantities with design surfaces of various surface roughnesses.

Therefore, it is possible to manufacture a plurality of types of designs with one type of mold, reduce the cost required for mold production, and reduce the number of man-hours for replacing molds, making it ideal for high-mix, low-volume production.

[Example] The following is a concrete explanation using Examples. First, as shown in FIG. 1, a film 1 having a transfer surface 10 on which a predetermined grain pattern is formed is prepared.

This film 1 was formed by biaxial stretching to a thickness Q of 5 mm, and the grain pattern was formed by shot blasting.

This film 1 is placed in a mold 3 as shown in FIG. The mold 3 here includes a fixed mold 30 fixed to a nozzle of an injection molding machine and a movable mold 31, and molten resin is injected into a cavity 32 from a side gate 33 provided on the movable mold 31.

(Holding Step) The film 1 is charged with static electricity and is attracted to the mold surface of the fixed mold 30 . Note that at this time, the transfer surface 10 is in the cavity 3.
2. It is attracted so that it faces inward.

(Molding process) After the fixed mold 30 and movable mold 31 are clamped, the injection molding machine inserts the mold into the cavity 32 from the direct gate 33.
Molten nylon resin is injected into the cavity 32.
Fill inside. The injected resin comes into close contact with the transfer surface 10 of the film 1, and a molded article is obtained.

(Peeling process) Then, after opening the mold, film 1 or design amount 2 with attached film
Release from the mold. Next, as shown in FIG. 3, the film 1 is peeled off from the design amount 2. Here, since the PET film 1 and the nylon design product 2 have extremely poor adhesion, the film 1 can be easily peeled off manually.

In the obtained design amount 2, a design surface 20 having a desired grain pattern is formed on which the inverse pattern of the surface roughness of the transfer surface 10 of the film 1 is transferred. The peeled film 1 can also be used for the next molding, which is economical.

That is, according to the manufacturing method of this embodiment, one type of mold 3
By simply using films 1 whose transfer surfaces 10 have different surface roughnesses, it is possible to produce design quantities 2 having design surfaces 20 of various surface roughnesses, which is extremely convenient.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a film used in an embodiment of the present invention.
FIG. 2 is a sectional view of the mold used, and FIG. 3 is an explanatory sectional view showing the state in which the film is peeled off. 1-...Film 2...Design amount 10...
Transfer surface 20...Design surface 3...Mold
32... Cavity patent applicant Aisin Kako Co., Ltd.

Claims (1)

[Claims] (1) A holding process in which a film having a transfer surface with a predetermined surface roughness is held on the mold surface so that the transfer surface faces into the cavity, and a molding process in which resin is injected into the cavity after mold clamping. and a peeling step of peeling off the film from the molded body after opening the mold to obtain a designed surface having a predetermined surface roughness to which the transferred surface has been transferred. Production method.