JP2000108143A - Manufacture of foamed molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable labor and cost required for sealing a space between a core and a skin to be curtailed. SOLUTION: This method for manufacturing a foamed molding is to inject a foaming agent 8 into a space between a core material 3 set in a core 2 and a skin 5 set in a cavity 4, through an injection hole 6 formed in the core 2 and an injection hole 9 formed in the core material 3. In this case, an elastic sealing member 16 is installed on the outer periphery, on the core material 3 side, of the injection hole 6 formed in the core 2, so that the foaming agent 8 is prevented from leaking into a space between the core 2 and the core material 3 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a foam molded article.

[0002]

2. Description of the Related Art FIG. 4 shows an instrument panel 1 of an automobile.
Usually, it is constituted by a foam molded article having a foam layer between the core material and the skin.

[0003] Such a foam molded product has been conventionally disclosed in Japanese Unexamined Patent Publication No.
It is manufactured by the method disclosed in JP-A-155978. That is, as shown in FIG.
Is set in the cavity mold 4, the core mold 2 and the cavity mold 4 are closed, and the foaming agent 8 is injected into the mold from the injection nozzle 7 through the injection hole 6 formed in the core mold 2. The core material 3 and the skin 5 are formed by foaming the foaming agent 8.
And are integrated by a foam layer.

[0004] When the foaming agent 8 is injected into the mold,
In order to prevent the foaming agent 8 from leaking into the gap between the core mold 2 and the core material 3, an elastic sealing material 10 is attached around the injection hole 9 of the core material 3 as shown in FIG. The tip is brought into contact with the elastic sealing material 10. In FIG. 5, reference numeral 11 denotes an elastic sealing material 10 formed on the core mold 2.
It is an escape to accommodate.

[0005]

However, in such a conventional means for producing a foamed article, it is necessary to attach an elastic sealing material 10 around the injection hole 9 to each of the core members 3, so that the elastic sealing material is required. There is a problem that the cost of the material 10 is increased, and that it takes time to arrange the elastic sealing material 10 on each core material 3.

Accordingly, an object of the present invention is to provide a method of manufacturing a foam molded article which can solve the above-mentioned problems and can reduce the labor and cost required for sealing between the core mold and the skin. is there.

[0007]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, a core mold is provided between a core material set in a core mold and a skin set in a cavity mold. In a method for producing a foam molded article in which a foaming agent is injected through an injection hole formed in the injection hole and an injection hole formed in the core material,
An elastic sealing material is attached to the outer periphery of the injection hole formed in the core on the core side to prevent leakage of the foaming agent between the core and the core side.

According to the first aspect of the present invention, by attaching the elastic sealing material to the core mold side, there is no need to attach the elastic sealing material around the injection hole to each core material. Since a large number of core members can be accommodated by the elastic seal member attached to the core mold, the cost of the elastic seal member can be greatly reduced, and labor for disposing the elastic seal member can be eliminated.

[0009]

First Embodiment A first embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of the present invention.
It shows. The same or equivalent parts as those of the conventional example will be described with the same reference numerals.

In the first embodiment, as shown in FIG. 1, a core material 3 is set in a core mold 2 and a cavity mold 4 is provided.
The core mold 2 and the cavity mold 4 are closed, and an injection nozzle 7 is inserted through an injection hole 6 formed in the core mold 2.
The core material 3 and the skin 5 are integrated by a foamed layer by injecting the foaming agent 8 into the mold and foaming the foaming agent 8.

When the foaming agent 8 is injected into the mold,
In order to prevent the foaming agent 8 from leaking into the gap between the core mold 2 and the core material 3, as shown in FIG. A seal holding groove 15 is formed, and an annular elastic sealing material 16 is fitted into the seal holding groove 15.

In FIG. 2, the seal holding groove 15 is formed downward and concentrically at a position separated by a required distance from the lower end opening of the injection hole 2. Are protruded downward. A groove corresponding to the ridge 18 is provided on the upper surface of the seal holding groove 15, and the elastic sealing material 16 is moved by the fitting of the ridge 18 and the groove.
To be held more firmly. In the figure, reference numeral 17 denotes an annular sealing projection provided on the elastic sealing material 16.

As described above, by attaching the elastic sealing material 16 to the core mold 2 side, it is not necessary to attach the elastic sealing material 16 around the injection hole 9 to each core material 3, and Elastic sealing material 16 attached to core mold 2
Therefore, the cost of the elastic sealing material 16 can be greatly reduced, and the trouble of disposing the elastic sealing material 16 can be eliminated.

[0015]

Second Embodiment FIG. 3 shows a second embodiment of the present invention. Note that the same or equivalent parts as those in the first embodiment are described with the same reference numerals.

First, in the second embodiment, a plurality of annular sealing projections 17 are provided concentrically on the elastic sealing material 16.

By doing so, the sealing performance can be improved.

Except for the above, it has the same configuration as that of the above-described embodiment, and can obtain the same operation and effect.

[0019]

As described above, according to the first aspect of the present invention, by attaching the elastic sealing material to the core mold side, the elastic sealing material is provided around the injection hole for each core material. Since there is no need to attach a material and the elastic sealing material attached to the core mold can cope with a large number of core materials, the cost of the elastic sealing material is greatly reduced, and the labor for disposing the elastic sealing material is eliminated. Can be achieved, which is a practically useful effect.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of Embodiment 1 of the present invention.

FIG. 2 is a partially enlarged view of the core type shown in FIG. 1;

FIGS. 3A and 3B are a side sectional view and a perspective view seen from below of an elastic seal according to Embodiment 2 of the present invention.

FIG. 4 is a schematic perspective view of an instrument panel of an automobile.

FIG. 5 is a cross-sectional view corresponding to a portion taken along line AA of FIG.

FIG. 6 is a partially enlarged view of the core member of FIG. 5;

[Explanation of symbols]

 2 core type 3 core material 4 cavity type 5 skin 6 injection hole 8 foaming agent 9 injection hole 16 elastic sealing material

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ken Saito 2-1910 Nisshin-cho, Omiya-shi, Saitama F-term (reference) 4F204 AD35 AG03 AG20 AH25 EA01 EB01 EB11 EB13 EK22

Claims (1)

[Claims] 1. A foam molding method for injecting a foaming agent between a core material set in a core mold and a skin set in a cavity mold through an injection hole formed in the core mold and an injection hole formed in the core material. In the method of manufacturing a product, an elastic sealing material is attached to an outer periphery of an injection hole formed in a core mold on a core material side to prevent leakage of a foaming agent between the core mold and the core material side. A method for producing a foam molded article.