JPH0354595B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a cushion pad for a seat. More specifically, the present invention relates to a method for manufacturing a cushion pad for a seat. a first cushion member having good air permeability and a first cushioning property; and a second cushioning member having a second cushioning property made of a foamed synthetic resin laminated on the lower surface side of the first cushioning member. The present invention relates to a method of manufacturing a seat cushion pad including a cushion member.

[Conventional technology]

Conventionally, in addition to the cushion pad made of a single material, the seat cushion pad has a first cushion member 2 of an appropriate thickness made of a synthetic resin material such as slab urethane, as shown in FIG.
and a second cushion member 3 laminated on the lower surface side of the first cushion member 2 with a hot melt sheet 4 interposed therebetween, thereby obtaining a cushion pad 1 with good sensitivity and surface feel. It is done like this.

[Problem to be solved by the invention]

However, in the conventional manufacturing method, the hot melt sheet 4 is expensive, which causes an increase in product cost, and when the hot melt sheet 4 has pinholes etc., the second cushion member 2 is attached to the first cushion member 2. The stock solution of foamed synthetic resin for molding the member 3 is impregnated through this pinhole,
Cushion pads 1 having partially different hardnesses are molded, and there is a risk that a large number of defective products will be formed.
Further, since the hot melt sheet 4 has the purpose of preventing impregnation, it does not have air permeability, and therefore the air permeability of the sheet is significantly inhibited. Furthermore, the first cushion member 2 is placed upside down in the lower die of a foam mold, and a stock solution of foamed synthetic resin for molding the second cushion member 3 is injected into the back side of the first cushion member 2. However, when performing foam molding under specified foaming conditions, foamed synthetic resin debris called urethane bread is generated from the vent hole of the upper mold, and processing of this urethane bread is complicated and hinders improvement of work efficiency. However, the cushion pad 1 having a uniform quality of molded product cannot be obtained.

An object of the present invention is to provide excellent seating and surface feel, and to be able to join a first and second cushion member without using an expensive hotmel sheet.
There is no risk that the undiluted solution of the foamed synthetic resin for molding the cushion member will form so-called urethane bread through the belt hole of the foam mold, and the undiluted solution of the foamed synthetic resin can be used effectively, and the processing of the urethane bread can be done easily. To provide a method for manufacturing a sheet cushion pad which is not necessary to carry out the above steps and is excellent in economic efficiency.

[Means to solve the problem]

The present invention has been made in view of the above-mentioned problems, and a first cushion member having air permeability and first cushioning properties is attached to the upper mold of a foam mold, and a stock solution of foamed synthetic resin is poured into the foam mold. A second material having second cushioning properties is injected into the lower mold of the foam mold.
In the manufacturing method of a sheet cushion pad, the first cushion member is integrally molded with the first cushion member, and the first cushion member is bonded to an air-permeable resin felt layer formed in advance into a desired shape; attaching the cushion member of No. 1 to the upper mold while maintaining the desired shape;
Next, a stock solution of foamed synthetic resin is injected into the lower die of the foam mold, and foaming gas and air generated when foam-molding the second cushion member are passed through the resin felt layer and the first cushion member. The method is characterized in that the second cushion member is foam-molded in a state in which the resin is discharged from the foaming mold through a vent hole in the upper mold and the foamed synthetic resin stock solution can be impregnated into the resin felt layer.

[Effect]

According to the method of the present invention, the first
A first cushion member having a cushioning property of The second cushion member is attached to the mold, and then the stock solution of foamed synthetic resin is injected into the lower mold of the foam mold to form the second cushion member. Therefore, the foaming gas and air generated during the foam molding of the second cushion member are eliminated. It can be passed through the breathable resin felt layer and the breathable first cushion member and discharged out of the foaming mold from the vent hole of the upper mold, and the stock solution of the foamed synthetic resin is impregnated into the resin felt layer. The second cushion member can be foam-molded in any possible state, and the first and second cushion members can be joined via a resin felt layer.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of manufacturing a seat cushion pad according to the present invention will be described in detail below with reference to the drawings.

2 to 4 schematically show an embodiment in which the method of the present invention is applied to a method for manufacturing cushion pads for seats of automobiles, etc. As shown in FIG. A first cushion member 12 molded from a resin material and having first cushioning properties with air permeability and a good surface feel, and a foamed synthetic resin laminated on the lower surface side of the first cushion member 12. a second cushion member 13 having a second cushion property different from the first cushion property of the first cushion member 12 formed by foam molding; and a second cushion member 13 located between the first and second cushion members 12 and 13. It is formed from a resin felt layer 15. The resin felt layer 15 and the second cushion member 13 are
The cushion member 13 is made of foamed synthetic resin stock solution 1.
The cushion pad 11 is integrally molded when foam molding is performed from 3', and the cushion pad 11 is foam molded in such a state that the resin felt layer 15 can be impregnated with this stock solution 13'.

The first cushion member 12 is made of a sheet of 5 to 30 mm thick, such as a slab urethane foam, and the resin felt layer 15 is made of coarse fibers such as coarse hair and half of thermosetting fibers. It is formed by mixing hair products, etc. This resin felt layer 15 is preferably formed into a desired shape by press molding, as shown in FIG. 3, rather than a plate-like one.

The sheet-shaped first cushion member 12 is bonded to this press-molded resin felt layer 15 via an appropriate bonding means, as shown in FIG.
It is set in the upper mold 21a of the foaming mold 21. This first cushion member 12 is held in shape by the elasticity of the press-molded resin felt layer 15,
It is attached to the upper mold 21a in close contact with the lower mold 21b.
The foamed synthetic resin stock solution 13' is injected into the upper mold 21.
a and the lower mold 21b are closed and foam molding is performed under predetermined foaming conditions to form the resin felt layer 15.
A cushion pad 11 as shown in FIG. 2 can be obtained with the second cushion member 13 bonded to the lower surface of the cushion pad 11.

Foaming gas generated during foam molding of the foamed synthetic resin stock solution 13' and air in the foam mold 21 pass through the breathable resin felt layer 15 and the first cushion member 12 and are formed in the upper mold 21a. There is no possibility that the liquid will be discharged to the outside through the vent hole 22 and cause scratches, sink marks, etc. on the second cushion member 13. Further, although the resin felt layer 15 is impregnated to some extent with the foamed synthetic resin stock solution 13' to form an impregnated layer, the first cushion member 12 is not impregnated, so the surface feel is not deteriorated; In particular, the impregnated layer on the curved portions formed on the side portions of the cushion pad 11 can increase the side support function and increase the side port effect.

〔Effect of the invention〕

The above is an embodiment of the method for producing a cushion pad of a sheet according to the present invention. According to this method, the elasticity of the breathable resin felt layer, which has been formed into a desired shape in advance, is utilized. The first cushion member is set in the upper die of a foam mold to maintain its shape, and then the second cushion member is foam molded, and during the foam molding of the second cushion member, the resin felt layer is ventilated. As it has the properties of foaming, it is possible to easily discharge foaming gas, air, etc. from the belt hole, and there is no generation of foamed synthetic resin waste from the vent hole, and the undiluted solution of foamed synthetic resin can be used effectively. To obtain a method for manufacturing a sheet cushion pad which can improve work efficiency without requiring processing work for synthetic resin waste, has a good surface feel, can increase support function, and is excellent in economic efficiency.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional cushion pad, FIGS. 2 to 4 each show an embodiment of the method of the present invention, and FIG. 2 is a seat of a vehicle seat manufactured by the method of the present invention. A cross-sectional view schematically showing one embodiment of the cushion, FIG. 3 is a cross-sectional view of the resin felt layer press-molded, and FIG.
FIG. 3 is an explanatory cross-sectional view showing a state in which the cushion member of FIG. 1 is molded by foam molding. In the figure, 11... cushion pad, 12... first cushion member, 13... second cushion member,
13'... Stock solution of foamed synthetic resin, 15... Resin felt layer, 21... Foaming mold, 22... Vent hole.

Claims (1)

[Claims] 1. A first cushion member that is breathable and has a first cushioning property is attached to the upper mold of a foam mold, and a stock solution of foamed synthetic resin is poured into the lower mold of the foam mold to form a second cushion member. The second one has cushioning properties.
In the manufacturing method of a sheet cushion pad, the first cushion member is integrally molded with the first cushion member, and the first cushion member is bonded to an air-permeable resin felt layer formed in advance into a desired shape; attaching the cushion member of No. 1 to the upper mold while maintaining the desired shape;
Next, a stock solution of foamed synthetic resin is injected into the lower die of the foam mold, and foaming gas and air generated when foam-molding the second cushion member are passed through the resin felt layer and the first cushion member. The sheet is characterized in that the second cushion member is foam-molded in a state in which the resin is discharged from the foam molding mold through a belt hole in the upper mold, and the foamed synthetic resin stock solution can be impregnated into the resin felt layer. Method of manufacturing cushion pads.