JPH01249087A - Manufacture of sheet pad having different hardness at local part - Google Patents

Abstract

PURPOSE:To obtain a sheet pad which possesses the superior close adhesiveness between two layers and the finishing performance of a local part by directly molding a fiber molded layer having different hardness at the prescribed local part, in the shaping part of a shaping mold for sheet and forming a cushion layer by pouring the foaming resin. CONSTITUTION:One side of a fiber layer 4 is coated with an impregnation liquid 6 for changing hardness such as reactive resin or latex by a spray gun 5. The fiber layer 4 is applied onto a prescribed projection part 8A of the shaping part 8 of a lower mold 7 for sheet which forms a sheet pad 1 so that the coated surface applied with the impregnation liquid 6 forms the projection part 8A side. Then, a local shaping mold 9 is press-attached onto the fiber layer 4, and the fiber layer 4 is formed into the shape conforming to the projection part 8A, and the impregnation liquid 6 is reaction-hardened, and then the local shaping mold 9 is demounted, and a fiber molded layer 4A is left on the projection part 8A. The foaming resin 10 for obtaining a cushion layer 2 of soft polyurethane is allowed to flow into the shaping part 8, and the shaping part 8 is closed by an upper mold 11 for sheet, and after the inside of the shaping part 8 is filled with the foaming resin 10, are hardening reaction is performed, the upper and lower molds 11 and 7 are removed. Therefore, the superior finishing appearance can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method of manufacturing a seat pad with locally varying hardness, which obtains a seat pad in which predetermined local areas have different hardness.

(Prior Art) Conventionally, seat pads have long groove-shaped recesses in predetermined areas on the outer skin where the fastening wires are arranged, and the fastening wires are placed in this recesses and are tightly attached to the fastening wires on the back side of the outer skin to secure the seat. The pad is covered.

Since the shape of the recessed portion of the seat pad is distorted when the fixing wire is attached, the recessed portion of the seat pad is processed to have a high hardness to obtain a seat pad with locally different hardness. Conventional seat pads with localized hardness are
Polyurethane is molded using a lower sheet molding mold 21 and an upper sheet molding mold 22 shown in FIG. 7, and as shown in FIG. While molding the molding pad 26, a hard polyurethane member 28 (see FIG. 10) of different hardness is formed using a component mold 27 consisting of a lower mold 27A and an upper mold 27B shown in FIG. Then, a member 28 of different hardness is adhered to the mounting recess 24 of the molded pad 26 shown in FIG. 11 to form a locally different hardness sheet pad 29 in which four predetermined portions 28A for fixing wires are processed to have a hard hardness.

(Problems to be Solved by the Invention) As described above, in the conventional seat pad 29 with locally different hardness, the separately molded hard polyurethane member 28 with different hardness is adhered to the molded pad 26 of the hard polyurethane layer 25. Due to molding errors between the sheet molding pad 26 and the different hardness member 28, it is difficult to match the different hardness member 28 and its four mounting parts 24; (b) it is difficult to adhere the different hardness member 28; There were problems in that steps were likely to occur and the finish was poor.

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to solve the above-mentioned conventional problems, and to provide a method for manufacturing a local ¥4 hardness seat pad that solves the problems (a) and (b) above. There is a particular thing.

(Means for Solving the Problems) In order to achieve the above object, the means of the present invention provides that a predetermined local part of the molding part of a seat mold for molding a seat pad is filled with an impregnating liquid such as a reactive resin for changing the hardness. A fiber layer impregnated with is placed, a layer of fiber 1Iff is formed in a local mold, and the impregnating liquid is reacted and hardened, and the local mold is removed to form a different hardness portion in a predetermined local area of the sheet forming edge molding part. After that, a foamed resin is injected into this molded part, cured, molded, and then removed from the mold to form a predetermined shape in which the fiber molded layer and a cushion layer made of foamed resin are joined. This is a method for producing a seat pad with locally varying hardness. In addition, it is desirable to use the impregnating liquid that makes the fiber molded layer have different hardness physical properties such as cushioning properties.

(Function) The fiber N layer impregnated with the impregnating liquid is molded in a predetermined local part of the molding section of the sheet molding die to form a fiber molded layer. The fiber forming layer is made to have physical properties of a predetermined hardness by curing the impregnating liquid. A foamed resin is injected into the molded portion where the fiber molded layer is left locally, forming a cushion layer having a hardness different from that of the fiber molded layer.

In injection molding of foamed resin, the fiber molded layer and the cushion layer are joined together.

I will explain.

Figure 1 shows a cross section (cross section taken along the line 1--■ in Figure 6) of a seat pad with locally varying hardness (hereinafter also simply referred to as a seat pad) 1, which is made of a cushion layer 2 of soft polyurethane and has an anchoring wire (not shown). ) The predetermined local portion 3 for placement is a long groove-shaped recess 3A, and this recess 3A i is formed into a fiber molding layer 4.
It is considered to be a hard part with high hardness made of A. This seat pad 1 with locally different hardness is formed by the following steps.

First, a fiber layer 4 for forming local areas 3 of different hardness is prepared, and as shown in FIG. 2, an impregnating liquid 6 for changing hardness such as reactive resin or latex is applied to one side using a spray gun 5. Ru. In the fiber N layer 4 of this example, 100 g/m of phenol urethane resin was applied to a polyester nonwoven fabric having a basis weight of 126 g/m. After that, the above-mentioned! ! Navy layer 4
is placed. The fiber layer 4 has a convex portion 8A on which the impregnating liquid 6 is applied.
placed on the side.

Next, the convex portion 8 is formed on the fiber layer 4, as shown in FIG.
The local mold 9 with a shape that covers A is /I4, and the 1N layer 4 is formed into a shape that follows the convex part 8A, and the impregnating liquid 6 is cured by reaction (in the case of the phenol urethane resin in this example, it is heated for 1 to 2 minutes at room temperature). curing time), and the local mold 9 is removed from the mold, leaving the molded IJ&M molding F molding A in the convex part 8△ of the molding part 8 (this fiber molding layer 4A has the above-mentioned conventional different hardness). (corresponds to member 28). ! In the molding part 8 of the lower sheet mold 7 where the llff molding layer 4A is left, a foamed resin 1 is applied to form a cushion layer 2 of soft polyurethane, as shown in FIG.
01 In this example, the urethane injection liquid is poured from the injection nozzle 13, and as shown in FIG. 5, the molding section 8 is closed with the sheet upper mold 11, and the injected foamed resin 10 is filled into the molding section 8 and caused to undergo a curing reaction. .

The foamed resin 10 in the molding section 8 is filled around the fiber molding layer 4Δ, and J! during the curing reaction. Fiber molded IF: 4A is embedded into one piece. Therefore, the upper die 11 for the sheet
Then, the lower sheet mold 7 is removed to obtain the pad 1 on the sheet 1 in which the fiber molded layer 4A and the cushion layer 2 are joined (see FIG. 6 and FIG. 1).

(As shown in FIG. 6 J3 and FIG. 1, the rolled seat pad 1 is formed into a predetermined sheet shape with a cushion layer 2 of soft polyurethane, and a predetermined local part 3 is made of IIM.
Recessed portion 3A that is hard and has cushioning properties due to molded layer 4A
It is said that the structure is as follows. A well-shaped recess 12 in the center of the seat pad 1 is a region into which a joint of the skin is inserted, and is formed only of soft polyurethane.

Note that the seat pad 1 of this example has a concave portion 3 in the fiber molded layer 4△.
After the fastening wire is inserted into A, the skin is placed on the top surface of the seat pad 1, and the first wire on the back of the skin and the fastening wire in the fourth part 3△ are tightly attached, and the skin is attached to the seat pad 1. (not shown).

The seat pad 1 of this example has high hardness by arranging the fiber molding R4A in the part where the shape is likely to be distorted when covering the outer skin, but the local part 3 having high hardness is not limited to the above-mentioned four parts 3A. Instead, it is applied to the outer circumferential surface of the seat pad 1, or to a portion where high hardness is required, or to a local area where high hardness is required. Moreover, the local part 3 may be made soft compared to the hard cushion layer as a whole.

(Effect of the Invention) The present invention involves directly molding a fiber molding layer of different hardness in a predetermined local area of the molding part of a mold for a seat, and then injecting foamed resin to form a predetermined cushion layer. Therefore, I
It is possible to obtain a seat pad with locally different hardness that has good adhesion between the HN molded layer and the cushion layer and has good local finish. In other words, according to the present invention, the above-mentioned problem (a) due to molding errors of the two types of conventional pads and problem (b) of poor finish are reliably solved.

In addition, according to the seat pad obtained according to the present invention, the fixing wire on the seat pad side is arranged in a hardened local area, so that the shape of the seat pad cushion layer is prevented from deforming during NN with the fixing wire on the back surface of the skin. It can be done without arising.

[Brief explanation of the drawing]

1 to 6 show examples of the present invention, FIG. 1 is a sectional view of the seat pad, FIG. 2 is a process diagram of resin coating of the fiber layer,
Figure 3 is a diagram of the molding process of the fiber layer in the lower mold for the seat, Figure 4 is a diagram of the injection process of foamed resin, Figure 5 is a diagram of the molding process of the seat pad, and Figure 6 is a front view of the seat pad. . 7 to 11 show a conventional seat pad molding process, and FIG. 7 is a partially omitted molding process diagram for obtaining a molded pad;
Fig. 8 is a sectional view of the main part of the molded pad, Fig. 9 is a drawing of the forming process of the member with different hardness, Fig. 10 is a front view of the member with different hardness, and Fig. 11 is a diagram of the forming process of the member with different hardness.
The figure is a sectional view of the seat pad. 1... Seat pad 2... Cushion layer 3... Local area 4... Fiber layer 4A... Fiber molding layer 6... Impregnation liquid 7... Lower mold for seat 8... Molding part 9... Local mold 10... Foamed resin 11... Upper mold for seat Applicant: Arakawa Auto Body Industry Co., Ltd. Agent Patent attorney Hidehiko Okada (3 others) 1... Seat pad 2... Cushion Layer 3...Local area 6...Impregnating liquid 7...Lower mold for sheet 8...Molding part 9...Local mold 10...Foamed resin 11...Soil mold for sheet Fig. 6≦ Ward.

Claims (1)

[Claims] (1) A fibrous layer impregnated with an impregnating liquid for changing hardness such as reactive resin is placed in a predetermined local part of the molding part of the seat mold that forms the seat pad, and the fibrous layer is molded using the local mold. Reacting and curing the impregnating liquid, removing the local mold and providing a fiber molding layer serving as a different hardness portion in a predetermined local part of the molding part of the sheet molding mold, and then injecting a foamed resin into this molding part, A method for manufacturing a seat pad with locally varying hardness, which comprises curing and molding, followed by demolding to obtain a seat pad of a predetermined shape in which the fiber molded layer and a foamed resin cushion layer are joined.