JPH0232414Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a urethane foam molding apparatus, particularly to heating of a mold.

Generally, a seat cushion or a seat back of a vehicle seat is composed of a plate-shaped urethane foam 1, as shown in FIG. This urethane foam 1 is held by a frame and its surface is covered with a skin such as leather or a synthetic resin sheet to form a seat.In the case of the urethane foam 1 constituting the seat cushion part, the main part is The sleeve portions 3, 3 located on both sides of the vehicle protrude to hold the occupant in a stable manner.

The urethane foam 1 is molded using an apparatus consisting of a mold as shown in FIG. In the figure, reference numeral 4 denotes a mold body, on the surface of which a molding space 5 having the same shape as the urethane foam 1 is provided, and a lid 6 for closing the molding space 5 is provided so as to be openable and closable. To mold, first, a urethane foam stock solution 7 is injected into the molding space 5, the lid 6 is closed, and the entire mold body 4 is heated, thereby foaming the stock solution 7 to form a urethane foam having the same shape as the molding space 5. 1 can be obtained.

Conventionally, the heating method is as follows:
A pipe is installed in the mold body 4, and steam or heated oil is passed through the pipe to heat the mold. ,
The overall space became larger, and there was a risk of steam or oil leaking from the pipe connections. There is also a method of heating the mold body 4 by placing it in a furnace, but this method has the disadvantage that the apparatus becomes large-scale. There is also a method of directly pouring steam or hot water on the mold body 4 side, or dipping it in hot water, but there is a risk that the steam, hot water, etc. may come into contact with the worker.

The purpose of the present invention is to eliminate the above-mentioned drawbacks by incorporating an induction heating coil into the molding die constituting the urethane foam and heating the mold body by induction heating. Explain.

FIG. 3 is a sectional view showing an embodiment of the urethane foam molding apparatus according to the present invention, and the same parts as in FIG. 2 are designated by the same reference numerals. In the same figure,
A hollow portion 10 is formed in the mold body 4 at a position surrounding the molding space 5, and an induction heating coil 11 is housed within the hollow portion 10, and the induction heating coil 11 is energized by a power supply circuit (not shown). be done. In this case, the mold body 4 is formed of a magnetic material. The outer surface of the mold body 4 is covered with a heat insulating layer 12 made of, for example, ceramic or heat-resistant synthetic resin.

In order to mold urethane foam using the urethane foam molding apparatus with the above configuration, a urethane foam stock solution is injected into the molding space 5, the lid 6 is closed, and the induction heating coil 11 is energized by electromagnetic induction. Since the entire mold body 4 is heated, the stock solution 7 can be foamed. Even if the current supply is stopped after heating, the mold body 4 is kept warm by the heat insulating layer 12, thereby increasing the heating efficiency.

Further, according to the present invention, by uniformly distributing the coils 11 in the mold body 4, the mold 4 can be heated uniformly, so that the entire stock solution 7 can be foamed, and the foaming rate can be uniform. It becomes possible to mold high-quality urethane foam.

According to the present invention, there is no need for pipe piping to pass steam etc. as in the past, and there is no need for a device to supply this steam.
Alternatively, a furnace for heating the mold body 4 is not required,
The space of the entire device can be reduced.
Furthermore, there is no fear that workers will come into contact with heated oil, hot water, steam, etc. Moreover, since the heating can be controlled by operating a switch on the power supply circuit, the heating time can be accurately controlled, making it possible to obtain high-quality products.

In the present invention, the mold body 4 is formed from a non-magnetic material, and a heating layer made of a magnetic material is provided on the inner surface of the molding space 5 of the mold body 4, and this heating layer is heated by induction. It's okay. Further, the induction heating coil 11 may be incorporated into the lid 6. Further, it goes without saying that the induction heating coil 11 may be made removable from the mold body 4.

As explained above, according to the urethane foam molding apparatus according to the present invention, at least the molding space side of the mold is made of a magnetic material, and an induction heating coil is incorporated in the mold to heat the mold by electromagnetic induction. Since heating is used, the device can be made compact, and the workability of foaming can be improved, allowing for mass production.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of a urethane foam, Fig. 2 is a sectional view showing an embodiment of a conventional urethane foam forming apparatus, and Fig. 3 is an embodiment of a urethane foam forming apparatus according to the present invention. FIG. 1...Urethane foam, 4...Mold body,
5... Molding space, 6... Lid, 11... Induction heating coil, 12... Heat retention layer.

Claims (1)

[Scope of utility model registration request] Inject urethane foam stock solution and foam.
In a urethane foam molding apparatus comprising a mold having a molding space for molding, at least the molding space side of the mold is made of a magnetic material, and an induction heating coil is built into the mold, and the urethane foam is heated by electromagnetic induction. A molding device for urethane foam, characterized in that the mold is heated by heating the magnetic material.