JPS599054A - Method of integrally molding skin and resin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention The present invention involves compression molding a thermoplastic resin between a pair of molds, and at the same time integrally molding a skin material for the purpose of improving the appearance, feel, etc. of the molded product. Regarding an integral molding method.

A skin material 1, such as fabric, is placed between the upper mold (for example, a cavity mold) and the lower mold (for example, a one-core mold).

There has been no known method for integral molding of the skin and resin, in which a heated thermoplastic resin (for example, AB8.PP, etc.) is placed between the skin material and the lower mold and compression molded after setting the P■0 leather etc. ing. Among these conventional methods for integrally molding a skin and a resin, there is a method called hot flow stamping molding. In this type of method, as shown in Figure 4,
A pinch-off shape is used for the parting to prevent resin from spilling out when the upper mold 10 and lower mold 11 are clamped. Since this pinch-off shape is a blade-like shape formed on the periphery of the upper die 10 and the lower die 11, defects such as resin protrusion and breakage of the skin material occur depending on the size of the clearance e. The reason why such resin protrusion and breakage of the skin material occur is because the clearance e of the pinch-off shape is inappropriate.
It is very difficult to make adjustments over the entire circumference of 1.

Therefore, in the present invention, instead of using the above-mentioned pinch-off shape, a so-called flash knotting shape is adopted to solve problems such as resin bulging out when the pair of molds is clamped, and breakage of the skin material. The purpose is to provide a method for integrally molding a skin and a resin.

In order to achieve such an object, the present invention has a pair of molds that form a space of a predetermined shape between them when pressed together, and one of the molds has the above-mentioned shape. A compression molding device is used which is provided with a hole that communicates with the space and a nest that can slide inside the hole.

Before clamping the molds, a thermoplastic resin raw material is poured into the hole on the side of the space defined by the insert, and a skin material is placed between the pair of molds. A method for integrally molding a skin and a resin is proposed, which comprises sliding the material toward the space to force all of the raw material into the space and integrating the raw material with the skin material.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a compression molding apparatus used to carry out the method of the invention. The pair of molds consists of an upper mold (cavity mold) 1 and a lower mold (core mold) 2, and when these are pressed together, a space 20 (a second
) is formed.

A vertical hole 21 communicating with the space 20 is provided in the center of the lower mold 2, and a vertically slidable insert 5 is disposed inside this hole 21.

The insert 5 is fixed to a plate 7 provided at its lower part,
A compression spring 8 installed on the plate 7 around this insert 5
The V-shaped lower mold 2 is supported by.

First, in Fig. 1, before the upper mold 1 and lower mold 2 are clamped,
A skin material 41 supported by a support frame 3 between the upper mold 1 and the lower mold 2
For example, insert fabric, pvo leather, etc. After that, the hole 2 on the side of the space 20 defined by the insert 5
Thermoplastic resin 61 heated to 710°C, for example, acrylic
Butadyl styrene (ABS), polypropylene (PP)
) etc. Thereafter, the grate 7 is moved upward relative to the upper mold 1 by a press (not shown), and the upper mold 1 is
and the lower mold 2 are clamped, and a skin material 4 is sandwiched between them to form a parting. When the plate 7 is moved further upward, the insert 5 rises within the hole 21.

The resin 6 that had been put therein is forced and spread into the space 20 between the skin material 4 and the lower mold 2. When the insert 5 rises until the upper surface 5a of the insert 5 is flush with the upper surface 2a of the lower mold 2, the skin material 4 is spread out until it is completely pressed against the inner surface 1a of the upper mold 1, while the resin 6 is completely buried inside the space 20, and the product shape is formed. At that time, the resin 6 and the skin material 4 are integrated. FIG. 2 is a sectional view of the skin material 4 and resin 6 during molding. As described above, in the present invention, problems such as resin protrusion and skin material tearing that occur when a so-called pinch-off shape is adopted as in the prior art do not occur. The integral piece of the top plate and resin molded in this way is taken out of the compression molding machine.

Secondary processing (for example, 1
If removed by machining), an integral molded product of skin and resin as shown in FIG. 3 will be obtained.

Note that as a drive source for the insert 5, a hydraulic cylinder (not shown) or the like may be used in addition to the press.

Also, depending on the material, the skin material 4 needs to be heated before being set in the mold. In addition, in order to prevent wrinkles, tears, etc. of the skin material 4 in the mold, it is possible to obtain a good molded product by vacuum forming the skin material 4 on the inner surface 18 of the upper mold 1 before mold clamping. can.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a compression molding device used to carry out the method of integrally molding a skin and resin of the present invention before mold clamping, and FIG. 2 is a cross-sectional view of the same compression molding device after mold clamping.
FIG. 3 is a partially cutaway perspective view of the final molded product, and FIG. 4 is a schematic cross-sectional view showing a conventional method of integrally molding the skin and resin. 1... Upper mold, 2... Lower mold, 4... Skin material, 5... Insert. 6...Resin, 20...Space part. 21...hole.

Claims (1)

[Claims] 1. It has a pair of molds that form a space of a predetermined shape between them when pressed together, and one of the molds has a hole that communicates with the space and a hole that communicates with the space. A compression molding device t equipped with a nest that can slide inside the hole is used. Before clamping the molds, a thermoplastic resin raw material is put into the hole on the side of the space defined by the insert, and a skin material is placed between the pair of molds, and after clamping the molds. A method for integrally molding a skin and a resin, characterized in that the insert is slid toward the space to force the raw material into the space and to integrate the raw material with the skin material.