JPS6024567Y2 - mold type - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a mold for producing a foam molded product having a cover sheet such as cloth on the surface.

Generally, as shown in Fig. 1, a foam molded product 3 made of a foam 1 made of urethane or the like with a cover sheet 2 made of cloth attached to the surface is used as a cushion body for vehicles, furniture, etc. There is.

The foam molded product 3 having the cover sheet 2 is manufactured as follows using, for example, a mold consisting of an upper mold and a lower mold.

First, a piece of fabric or the like that will become a cover sheet is laid inside the lower part of the mold.

Next, the foaming material is injected into the lower mold on which the cover sheet is laid, and the upper mold is placed on the lower mold and foamed to obtain a foam molded product.

However, conventionally, molds made of metal such as iron or aluminum, or made of hard resin have been used in order to obtain foam molded products of predetermined shapes.

For this reason, if the area of the cover sheet is larger than the area of the inner wall of the mold, or if the shape of the inner wall of the mold is complex, or if there are many curved parts,
Since the cover sheet is laid in a loose state without being in close contact with the inner wall surface, there is a problem in that the area becomes wrinkled when foaming pressure is applied.

The present invention was developed as a result of various studies in view of the above, and provides a mold capable of manufacturing a foam molded product having a cover sheet tautly adhered to the surface thereof. It is.

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

FIG. 2 is a sectional view showing an embodiment of a mold to which the present invention is applied.

The mold 4 is composed of a flat upper mold and a lower mold 7 having a soft or semi-hard elastic thin sheet 6 adhered to its inner wall surface.

As the material for the soft or semi-hard elastic thin sheet 6, it is desirable to use, for example, polyurethane foam, polyethylene, polyvinyl chloride foam, elastomer, rubber sponge, nonwoven fabric, or the like.

Further, the thickness of the thin elastic sheet 6 is desirably set appropriately depending on the material of the thin elastic sheet 6, the shape of the foam, the material of the cover sheet attached to its surface, etc. Usually, it is preferably within the range of 1WrL to 5rfrIn.

Further, the thin elastic sheet 6 may be attached to the lower mold 7 by using an adhesive or the like after the mold 4 is formed, or if the mold 4 is a simple type. If high heat is not applied during manufacturing, the elastic thin sheet 6 may be directly attached to a master model that determines the shape of the mold 4, and then attached when the mold 4 is manufactured.

The material of the mold 4 is preferably selected from metals such as iron and aluminum, resins such as hard urethane foam, etc., but especially the thin elastic sheet 6.
It is preferable to use a material that can be easily attached.

In the mold 4 configured in this manner, the thin elastic sheet 6 is attached to the inner wall surface of the lower mold 7, so that the cover sheet such as cloth is laid in the lower mold 7 in a slightly loosened state. Even if the foaming solution is injected onto it and foaming is performed, the elastic thin sheet 6 will be compressed appropriately according to the foaming pressure, so the loosened cover sheet will be compressed by the compressed elastic thin sheet 6. is pushed outward only.

As a result, a foam molded article can be obtained in which the cover sheet is tautly adhered to the surface of the foam.

In addition, even if the cover sheet cannot be brought into close contact with the inner wall surface of the lower mold 7 due to the complicated shape of the inner wall surface of the lower mold 7, the compression of the elastic thin sheet 6 caused by the foaming pressure will similarly cause the surface to A foam molding can be obtained to which the cover sheet is applied under tension.

In the above embodiment, the elastic thin sheet 6 is attached to the entire inner wall surface of the lower mold 7, but the present invention can also be applied to the lower mold 7 as shown in FIG. A thin elastic sheet 6 is attached to the inner wall surface of the lower mold 7, or a thin elastic sheet 6 is attached to the bottom surface of the lower mold 7 as shown in FIG.
This includes those in which thin elastic sheets 6 are adhered to appropriate positions within the molds 4' and 4'' depending on the foam molded product to be molded.

As explained above, the mold according to the present invention has a thin elastic sheet attached to the inner wall surface of the mold to obtain a foam molded product with a cover sheet tautly attached to the surface. It is something that can be done.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a foam molded product with a cover sheet attached to the surface, Fig. 2 is a sectional view showing an embodiment of the mold according to the present invention, and Fig. 3 is a lower mold. Figure 4 is a sectional view showing another embodiment of the mold according to the present invention in which a thin elastic sheet is attached to the inner wall surface of the lower mold. It is a sectional view showing other examples of such a mold type. 4', 4'' 4 III...Mold type, 5.
... Upper mold, 6 ... Elastic thin sheet, 7
...Lower mold.

Claims (1)

[Scope of utility model registration request] A mold type characterized in that a soft or semi-hard elastic thin sheet is attached to at least the inner wall surface of the lower mold.