JPH0444336Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a slush mold for molding a multicolored skin.

(Prior art) In recent years, due to consumers' preference for luxury products, automobile interior parts such as instrument panel pads, console boxes, armrests, etc. have been replaced with multi-colored parts instead of the conventional single-colored skin. Multicolored epidermis is in high demand.

On the other hand, since slush molding allows surface patterns to be accurately reproduced and is suitable for mass production, there has been a desire to develop a mold for molding the above-mentioned multicolored skin by slush molding.

By the way, in order to form the multicolored skin as described above by slush molding, it is necessary to (1) how to join different colored skins together, and (2) how to make the boundaries between different colors clearly and without bleeding. There are two issues that need to be resolved: whether it can be expressed.

In order to solve these problems, a molding method and a molding method were proposed in Japanese Unexamined Patent Publication No. 59-15671.
In No. 148409, we proposed a mold for molding multicolored skins.

To briefly explain the content of the above-mentioned prior art, both are based on a mold in which the molding surface is divided into multiple sections by protrusions. By making them come into contact with each other, the inside of the mold is partitioned into a plurality of molding chambers.

As a method of using the mold, the latter application discloses a method of joining different colored parts by spraying or the like.

(Problems to be Solved by the Invention) Of the two problems mentioned above, the conventional slush mold has a great effect in clearly expressing the boundaries between different colors.

However, there are still problems to be solved regarding joining different colored skins. That is, as shown in FIG. 5, in the molding die of the prior art, when thermoplastic resin 34 is sprayed at the junction of different-colored skins 32 and 33 to separate the molding surface with protrusions 31, thermoplastic resin 34 is sprayed from the tip of protrusion 31. There is a drawback that the resin 34 flows and the joint becomes thin.

For this reason, different-colored skins molded using conventional molds often break at the joints of the skin during use. Therefore, the applicant of the present application has focused on such drawbacks of the conventional slush molds, and has aimed to provide a slush mold that can mold a multicolored skin with strong joints.

(Means for Solving the Problems) The feature of the present invention for achieving the above-mentioned object is that the molding surface is formed by grooves in the slush molding mold, which has a predetermined shape and can control the temperature of the molding surface. It is a slush mold that is divided into multiple parts.

The slush mold of this invention uses grooves to partition the molding surface instead of conventional protrusions, so when thermoplastic resin is sprayed, the resin does not run off and spreads uniformly within the grooves, making the joints strong and multicolored. The epidermis can be shaped.

In addition, even when the skin formed in areas other than the grooves is in a molten state, it does not flow into the grooves at the ends of the grooves due to surface tension, so the clarity of the unique joints is maintained.

(Example) Specific examples of the present invention will be further described below.

FIG. 1 is a sectional view of a slush molding die according to a specific embodiment of the present invention, and FIGS. 2, 3, and 4 each illustrate how to use the slush molding die according to a specific embodiment of the present invention. It is a sectional view of the slush mold shown.

In FIG. 1, numeral 1 indicates the slush mold of this embodiment. The slush mold is made by electroforming or thermal spraying of nickel, aluminum, etc., and is capable of copying the shape and molding the surface of the desired shape.A pipe 2 is provided on the back of the mold 22 through which a heat medium such as oil or steam flows, and the molding surface is Heat 3 to about 170-280℃, or
It can be cooled down to around 20℃.

A groove 4, which is a feature of the present invention, is provided in the center of the molding surface 3 to divide the molding surface into two sections.

The grooves 4 may have no pattern or the same joint pattern as the molding surface 3 other than the grooves 4 (for example, a leather-like pattern, a cloth pattern), but by applying a seam pattern or rope pattern to the part, It is also possible to create a texture that has a more unified appearance.

The mold 22 described above is mounted on one side of a metal or synthetic resin box 25 mainly for safety reasons or for the purpose of preventing unnecessary heat dissipation.

In this example, a single groove is shown as an example, but it is also possible to provide multiple grooves, for example, three grooves, so that the mold can be filled with four grooves.
It may be divided into sections, or a certain portion may be surrounded by a groove.

The method of using the slush mold of this embodiment will be further explained below.

First, as a preparatory step for the molding process, heat transfer oil maintained at approximately 160 to 300°C is poured into pipe 2 on the back of mold 1 to raise the temperature of the molding surface 3 of mold 1 to approximately 160 to 270°C. .

Then, as shown in FIG. 2, a partition plate 5 whose tip end is processed to approximately match the groove 4 is attached to the groove 4 to partition the mold into 6 or 72 molding chambers.

Thereafter, thermoplastic resin powders 20 and 21 of different colors are filled into each molding chamber, and the raw material is spread over each part of the molding surface 3 by rotating and rocking the mold 1. After the semi-molten or molten skins 8 and 9 are attached to the molding surface 3 to a suitable thickness, the mold 1 is turned over and excess raw material is discharged (not shown).

After that, the partition plate 5 is removed, and a thermoplastic resin powder 12 having a different color tone from that filled in the molding chambers 6 and 7 is applied by spraying 11 or another method to the groove portion 4 to which the surface is not attached. do.
(Fig. 3) At this time, the skin attached earlier does not enter the groove due to the influence of surface tension, so the clarity of the joining surface of the different-colored skin is ensured as in the conventional mold. When the coating is completed without any gaps in the grooves 4, the spraying is finished and the thermoplastic resin in the grooves 4 is further melted by heating. At this time, as shown in FIG. 4, the molten thermoplastic resin flows within the groove 4 and is uniformly distributed.

Then, the semi-molten or molten skin is cured and cooled to form skins 8 and 9 on the molding surfaces of each molding chamber 6 and 7.
and connects groove 4 epidermis. Next, the molded surface 1 and the skin are cooled, and the solidified skin is removed from the mold, thereby making it possible to obtain a strong multicolored skin at the joint.

(Effects) The slush mold of the present invention adopts a structure in which the molding surface is divided into multiple sections by grooves instead of the protrusions of the conventional multicolor mold, so that the slush mold has a considerable thickness at the joint of the skin. It has the effect of shaping the epidermis.

In addition, the clarity of the boundary between the different colored epidermis is as good as in the conventional case.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a slush mold according to a specific embodiment of the present invention, and FIGS. 2, 3, and 4 respectively show how to use the slush mold according to a specific embodiment of the present invention. FIG. 5 is a cross-sectional view of a slush mold, and FIG. 5 is a detailed cross-sectional view of a conventional slush mold. 1...Slush mold, 4...Groove.

Claims (1)

[Scope of utility model registration request] A slush mold having a predetermined shape and capable of controlling the temperature of a molding surface, the molding surface being partitioned into a plurality of parts by grooves.