JPH0428206B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a method for manufacturing a skin material having a different-colored surface, and in particular, by using a so-called slush molding method using a thermoplastic synthetic resin in the form of powder or paste, The present invention relates to a method for molding a skin material.

(Prior art) In recent years, skin materials used for furniture or vehicle interior parts, such as seats, headrests, instrument panels, glove boxes, etc., have come in a variety of surface shapes and different colors to satisfy consumer tastes. There is a growing demand for a system that has the following characteristics.

On the other hand, one method for manufacturing skin materials with a predetermined shape is the slush molding method, which combines a heatable mold with an inner surface that corresponds to the product shape and a raw material storage mold. A molding chamber is formed inside the molding chamber, and a predetermined powder or paste thermoplastic synthetic resin is placed in the molding chamber and the mold is heated to form a predetermined skin on the inner surface of the mold. I'm trying to mold it. In order to produce a different-colored skin material having a different-colored surface using this slush molding method, powder raw materials of two or more colors are mixed in advance, and by molding this, a mottled pattern is created on the surface. A method for forming this has been clarified.

(Problem to be solved) However, the method of manufacturing unique skin materials using the conventional slush molding method has a fatal drawback that the state of the pattern that appears on the surface cannot be controlled, and also, There is an inherent problem in that it is extremely difficult to form a different color portion with a different hue, shape, or form in a portion.

(Solution Means) Here, the present invention has been made to solve the above-mentioned problems, and its gist is to provide a heatable mold having an inner surface corresponding to the shape of a product, and a raw material. Together with the storage mold, a molding chamber is formed inside, and a predetermined thermoplastic synthetic resin material in the form of powder or paste is placed in the molding chamber, and the molding mold is heated. When molding a predetermined skin on the inner surface of the mold, a predetermined pattern of different colored portions is formed in advance on at least a portion of the inner surface of the mold by stamping, and then the skin is molded. It's what I did.

That is, in the present invention, first, as illustrated in FIG.
A different color material 14 made of a thermoplastic synthetic resin material in the form of powder or paste for forming a different color portion is formed as a layer of a predetermined thickness on the surface of the stamp pad 12 by a method such as coating. be done. The mold 16 also has an inner surface 18 corresponding to the product shape.
It is further provided with suitable heating means (not shown) so that the inner surface 18 of the mold 16 can be heated to a desired temperature. The portion of the inner surface 18 of the mold 16 where the unique color portion is to be formed is formed by a concavo-convex portion 2 having a predetermined shape.
It is formed as 0.

The stamp pad 1 of the stamp device 10 is then
2 are facing each other, when the stamp pad 12 is pressed against the uneven portion 20, as shown in FIG.
The upper different color material 14 is stamped onto the uneven portion 20 in a predetermined pattern.
Here, the different color material 14 is attached to the tip of the convex part of the concavo-convex part 20. Further, in order to attach the different color material 14 in a predetermined pattern to such uneven portions 20,
The mold 16 is generally heated, and this heating causes the different color material 1 to come into contact with the uneven portion 20.
4 melts and becomes attached. In order to perform such a stamping operation on the different-colored material 14, the stamp stand 12 of the stamp device 10 is generally made of a heat-resistant elastic material such as heat-resistant rubber.

Next, a mold 16 is formed by forming a different color portion 22 made of a different color material 14 on the uneven portion 20.
As shown in FIG. 3, a raw material storage mold 26 houses a skin material 24 made of a predetermined powder or paste thermoplastic synthetic resin material such as vinyl chloride resin, which will form the desired skin material.
The mold is then closed. Therefore, the skin material 24 is made of the mold 16 and the raw material storage mold 2.
6 and is housed in a molding chamber 28 formed together with the molding chamber 28.

In this way, the mold 16 and the raw material storage mold 2
6 are combined, and as shown in FIG. 4, they are turned over and the powdered or pasty skin material 24 is brought into contact with the inner surface 18 of the heated mold 16. The skin material 24 is gradually melted and molded into the mold 16.
A molten layer of a predetermined thickness is formed on the inner surface 18 of the molten metal. At this time, a skin material 24 of a predetermined thickness is also formed on the uneven part 20 on which the different color part 22 is formed.
This results in the formation of a molten layer.

After a molten layer of skin material 24 of a predetermined thickness has been formed on the inner surface 18 of the mold 16, the molds are turned over again so that the mold 16 is on the upper side, as shown in FIG. Since the unmelted skin material 24 is accommodated in the lower raw material storage mold 26 as shown in FIG. This allows good separation from the material 24. Thereafter, the mold 16 is removed from the raw material storage mold 26, cooled to solidify the molten skin layer 30 formed on the inner surface 18, and removed from the mold, as shown in FIG. , the desired skin material molded product 32 is obtained.

Therefore, in the skin material molded product 32 formed in this manner, product uneven parts 34 having a shape corresponding to the uneven parts 20 are formed in the parts corresponding to the uneven parts 20 of the mold 16. However, in such a product uneven part 34, as shown in FIG. 7, the bottom of the concave part is configured as a different color part 22 made of a different color material 14, and the part made of the skin material 24 making up the convex part is It is recognized as a symmetrical pattern with respect to the symmetrical pattern, and an effective unique color effect can be produced.

In addition, the unique color part 2 in the skin material molded product 32
As the unique material 14 constituting 2, the skin material 2
A similar resin material with a different hue from the skin material 24 is generally used, but there are also other resin materials with different shades of color, resin materials different from the skin material 24, and even powder-like resin materials. It is also possible to configure the different color portion 22 using a material. In short, the different color part 22 has a different hue, surface morphology, etc. compared to other parts of the skin material.

Furthermore, in the above example, the different color parts 22 are arranged in a predetermined pattern with respect to the uneven parts 34 of the product, but the pattern of the different color parts 22 is arranged with respect to the flat surface of the skin material molded product 32. , may be formed flat. In that case, a predetermined pattern of different colored portions will be formed on the flat inner surface of the mold 16 by the stamp pad 12 of the stamp device 10. In order to form a predetermined pattern of different color portions 22 on such a flat inner surface 18, the surface of the stamp pad 12 is made into an uneven surface corresponding to the pattern, or the pattern is formed on the flat surface. The different color material 14 is arranged correspondingly.

(Effects of the Invention) As is clear from the above description, the present invention provides a stamping operation for at least a portion of the inner surface of the mold before forming a predetermined skin by the slush molding method. This is a skin material having a different color surface that forms a predetermined pattern of different color parts, thereby forming a desired pattern, picture, shape, or surface morphology with good reproducibility and accuracy. This makes it possible to advantageously produce molded products (molded products), and also has the advantage that there is no need to separately install a special printing process for the skin material, which is where the great industrial significance of the present invention lies. can be found.

[Brief explanation of drawings]

1 to 5 are cross-sectional explanatory views showing each step of one molding cycle according to the present invention, and FIG. 6 is a perspective view of a main part of a skin material molded product obtained thereby. , No. 7 is an enlarged view of the main part. 10: Stamp device, 12: Stamp stand, 1
4: Different color material, 16: Molding mold, 18: Inner surface, 2
0: Uneven part, 22: Different color part, 24: Skin material, 2
6: Raw material storage mold, 28: Molding chamber, 30: Molten skin layer, 32: Skin material molded product, 34: Product unevenness.

Claims (1)

[Scope of Claims] 1 A heatable mold having an inner surface corresponding to the shape of the product and a raw material storage mold are combined to form a molding chamber therein, and a predetermined powder or paste material is placed inside the molding chamber. When molding a predetermined skin on the inner surface of the mold by accommodating a thermoplastic synthetic resin material and heating the mold, at least a part of the inner surface of the mold is stamped in advance. 1. A method for manufacturing a skin material having a different color surface, characterized in that the skin is formed after forming a predetermined pattern of different color portions through an operation. 2. Claim 1, wherein the mold has an uneven portion on at least a part of its inner surface, and a different color portion is formed by the stamp operation at the tip of the convex portion of the uneven portion. A method for producing a skin material having a different-colored surface as described in 2. 3. The method of manufacturing a skin material having a different-colored surface according to claim 1, wherein a predetermined pattern of different-colored parts is formed on the flat inner surface of the mold by the stamping operation.