JPS60154015A - Integral expansion molding of head rest - Google Patents

Abstract

PURPOSE:To effectively draw out gases generated and air in an expanded molding due to the increase in the volume of the expanded molding by a method in which gases generated between the skin and core of an expanded molding are introduced through the holes of the core into the core and drawn out to the outside of the mold through a degassing pipe from the inside of the core. CONSTITUTION:A gas-impermeable skin 2 is attached to the inner surface of an expansion mold 1, and a core 4 and a stay 5 in combination are inserted into the mold 1. A insert 6 is set along the end of the skin 2. A degassing pipe 11 is inserted into venting holes 3 and 2a and a pipe hole 8. When an expandible raw liquid 9 is cast into the space inside the skin 2, it is gradually expanded and packed orderly from below to above. In this case [arrow mark (a)], gases generated and air flow through the hole 4 of the core 4 into the core 4, pass through the pipe 11 and venting holes 2a and 3, and are directed to the outside of the mold 1 [arrow mark (b)]. After removing the mold [arrow mark (c)], the pipe 11 is drawn out or the projected portion is cut off.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an integral foam molding method for a headrest in which a foaming liquid is injected between a non-breathable skin material, a core material and a stay, and foaming is performed.

FIGS. 1 and 2 show a conventional technology for integrally foaming a headrest.

In this prior art, a non-breathable skin material 2 is mounted inside a foam mold 1, and a gas vent hole 2a is formed in the skin material 2 at a position facing the gas vent hole 3 of the foam mold 1. A combination of a core material 4' and a stay 5' is inserted inside the skin material 2, and an insert material 6 having air permeability such as slab urethane is attached between the gas vent hole 2a and the core material 4'. A foam stock solution 9 is injected between the combination of the material 2, the core material 4', and the stay 5', and the gas is released from gas vent holes 3 and 2a penetrating the foam mold 1 and the skin material 2. .

However, in the conventional technology, only from the gas vent holes 3 and 2a,
Since the gas is vented, it is difficult to vent the gas during foaming, which tends to create cavities in the foam and inhibit foaming.If the amount of foam stock solution 9 injected is excessive, ,
There is a drawback that the foam is ejected from the gas vent hole 3 and stains the skin material 2, and there is also a drawback that the foam is deformed due to abnormal expansion during demolding due to insufficient gas venting. Incidentally, C in FIG. 2 indicates the direction in which Paris is discharged.

An object of the present invention is to provide an integral foam molding method for a headrest that can effectively extract gas generated from a foam and internal air due to an increase in volume of the foam, and will be described in detail below with reference to the drawings.

FIG. 3 shows an embodiment of the present invention, in which a non-breathable skin material 2 is installed inside a foam mold 1, and a combined body of a core material 4 and a stay 5 is arranged inside the skin material 2. .

The foaming mold 1b is constructed by combining the negative half part 1a and the other parts 1b and lc.

The foam mold 1 and the skin material 2 are provided with gas vent holes 3 in the foam mold 1 and gas vent holes 2a in the skin material 2 so as to penetrate from the inside of the skin material 2 to the outside of the foam mold 1.

The core material 4 is formed hollow, and has ventilation holes 7 formed at its upper and lower ends, and gas vent holes 2a of the skin material 2 marked with @.
A pipe insertion hole 8 is formed at the opposite end.

The stay 5 is formed of a pipe with one end (lower end in FIG. 3) closed and the other end open, but it may also be a simple rod-shaped body.

The end portion of the skin material 2 is arranged on the mold mating surface between one half 1a of the foam mold 1 and the other part 1c, and an insert made of soft slab urethane or the like is placed inside the skin material 2 along this mold mating surface. The top material 6 is attached.

A gas venting pipe 11 is inserted into the gas venting hole 3 of the foaming mold 1, the gas venting hole 2a of the skin material 2, and the pipe insertion hole 8 of the core material 4, so that the inside of the core material 4 and the outside of the foaming mold 1 communicate with each other. formed into a state. The gas venting pipe 11 has an appropriate diameter depending on the foaming pressure of the foam stock solution 9 injected between the skin material 2 and the core material 4.

Therefore, an air-impermeable skin material 2 is attached inside the foam mold 1, a combined body of the core material 4 and stay 5 is inserted inside the skin material 2, and an insert material 6 is placed along the end of the skin material 2. Next, the gas vent pipe 11 is inserted into the gas vent holes 3 and 2a and the pipe insertion hole 8, and the foam mold 1 is inserted into the space formed between the inside of the skin material 2 and the combined body of the core material 4 and the stay 5. Some ICs
When the mold is opened and the foam stock solution 9 is injected, the stock solution 9
As shown by arrow a in FIG. 3, the foam is sequentially foamed and filled upward from the bottom.

At this time, the gas generated from the foam stock solution 9 and the internal air due to the increased volume of the foam flow into the interior of the core material 4 through the ventilation holes 7 of the core material 4, as shown by the arrows in FIG. Next, core material 4
Gas venting pipe 11 inserted into the pipe insertion hole 8 of
The foam passes through the gas vent holes 2a and 3 and is extracted to the outside of the foaming mold 1 as shown by arrow C.

Further, excess needles of the foam stock solution 9 are impregnated and absorbed into the insert material 6, or are discharged into the core material 4 through the ventilation holes 7, and are prevented from being discharged from the gas vent holes 3 of the foam mold 1.

After the foaming of the foam is completed, one half 1a of the foaming mold 1 and the other part 1
b, lc is opened, and the integrated foam molded product 21 of the skin material 2, foam, core material 4, and stay 5 is removed from the mold.

After demolding, the gas vent pipe 11 is pulled out or the protruding portion is cut.

The above is an embodiment of the integral foam molding method for a headrest according to the present invention. According to this method, most of the generated gas of the foam and the internal air due to the increase in the volume of the foam are removed from the core material. The gas is introduced into the interior of the core material through the vent hole provided in the core material, and then the external pressure of the foam mold is removed through the gas vent pipe inserted into the pipe insertion hole of the core material. This has the effect of preventing the formation of bubbles and poor foaming.

Further, according to the present invention, even if the injection amount of the foam stock solution is excessive, it is possible to prevent the discharge of particles from the gas vent hole, and the foam is deformed due to abnormal expansion during demolding. It also has the effect of preventing

It should be noted that the above description merely shows one embodiment of the present invention, and it will be obvious that various modifications and changes can be made without departing from the spirit of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a container for explaining the prior art, FIG. 2 is an enlarged view of part A in FIG. 1, and FIG. FIG. 4 is a perspective view of a headrest manufactured according to the present invention. In the figure, 1: foam type, 2: skin material, 2a: gas vent hole of skin material, 3: gas vent hole of foam type, 4: hollow core material, 5: stay, 6. Insert material, 7.
Vent hole, 8...Pipe insertion hole, 9...Foam stock solution, 1
1... Gas vent pipe, 21... Headrest as an integral foam molded product.

Claims (1)

[Claims] A non-breathable skin material is attached to the inside of the foam mold, and a bonded body in which the headrest stay and the core material are integrally joined to one side of the tip of the headrest is placed inside the skin material. In an integral foam molding method for a headrest in which a foam stock solution is injected inside and foamed, a gas vent hole is formed by penetrating the foam mold and the skin material, and a ventilation hole and a pipe insertion hole are formed in the core material. An integral foam molding method for a headrest, characterized in that a gas venting pipe is inserted into the gas venting hole and the pipe insertion hole, and the foam generated between the skin material and the core material is extracted to the outside of the mold.