JP3250707B2 - Structure of integral foam in vehicle seats - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat (seat) obtained by injecting foam material into a trim cover and integrally foaming a pad, and an integrally foamed product such as an armrest and a headrest provided on the seat. is there.

[0002]

2. Description of the Related Art In a conventional automobile seat, a trim cover is set in a mold for pad molding, and a foam material such as polyurethane foam is injected into the trim cover to foam the pad integrally with the trim cover. Some are molded. In the trim cover described above, a foam (urethane foam slab material) wadding is provided on the back surface side of the skin material constituting the front surface in order to improve the feel.

On the pad side of this wadding,
A film is provided in order to prevent penetration of the foam raw material into the pad during molding of the pad (for example, Japanese Utility Model Publication No. 4-790, Japanese Utility Model Publication No. 5-44100).
Issue publication).

[0004]

In the above conventional products, the wadding is not impregnated with the foam material by the film, so that the wadding does not harden due to the impregnation of the foam material, and the feel is good. However, since the film is non-breathable, in the case of armrests and headrests in which the pad is breathable and the entire pad is covered with a trim cover, the airflow in the pad is impaired and the pad may become stuffy. In addition, there is a problem that the cushioning property of the pad is impaired. Therefore, an object of the present invention is to eliminate such a defect in a conventional product.

[0005]

Means for Solving the Problems To achieve the above object, an integrated foamed product in a vehicle seat according to the present invention is:
In an integral foamed product for a vehicle seat obtained by injecting a foam material into a trim cover and integrally foam-forming a pad having air permeability, the trim cover includes a gas-permeable skin material constituting a surface, and a gas-permeable foam layer. A, a structure comprising a laminate of an impregnation-preventing film obtained by forming a large number of air holes in a non-permeable film and a gas-permeable foam B.

[0006]

The foam material for pad formation having air permeability is provided on the impregnation prevention film from a part of the gas permeable foam layer B at a place where the foaming pressure is high, such as a portion near the injection port of the trim cover where the foam material is injected. Although it penetrates into a part of the gas permeable foam layer A from a part of the air hole, the gas permeable foam layer B surrounding the air hole of the impregnation preventing film in a part which is not affected by the foaming pressure does not penetrate. Has air permeability.

[0007]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a trim cover (C) used in the present invention. In the figure, (1) is an impregnation-preventing membrane formed by opening a large number of air holes (11) in a film, and (2) is an air-permeable bubble. Body B,
(3) shows a breathable foam A, and (4) shows a breathable skin material constituting a surface of a seat, an armrest, a headrest or the like.

The above skin material (4), air-permeable foam A
(3) The laminated body composed of the impregnation prevention film (1) and the gas permeable foam B (2) is sewn or the like so that the ventilation holes (11) of the impregnation prevention film (1) are not blocked. When used for an armrest, a headrest or the like, the trim cover (C) is sewn into a bag shape, and a foam material is injected into the inside to form a breathable pad.

The above impregnation preventing film (1) has flexibility,
It is molded from a synthetic resin film such as vinyl chloride that does not penetrate the foam material for pad molding.

Each of the vents (11) has an inner diameter of 0.5 mm to 2 mm and a density of 5 per 100 cm 2.
The impregnation prevention film (1) is provided at a rate of 0 to 60.

The gas-permeable foam B (2) is a high-density open-cell polyurethane foam. That is, if the density is 0.0
At least 4 grams / cubic centimeter, to regulate the amount of foam material permeated,
The amount of leakage from 1) to the gas-permeable foam A (3) is limited.

The air-permeable foam A (3) is used for the air-permeable foam B (2) such as wading made of open-cell urethane foam slab material used for a conventional vehicle seat trim cover. A low-density polyurethane foam laminated on the back side of the skin material (4). The skin material (4) is a conventionally used air-permeable fabric such as a woven fabric.

FIG. 2 shows an armrest of a vehicle seat formed using the trim cover (C) described above. The trim cover (C) is sewn in a bag shape, and a frame (F) is inserted therein. It is set in a mold, and a foam material for forming a pad (P) having open cells is injected into the trim cover (C) from an inlet provided in the trim cover (C), and the pad (P) is trimmed. It is formed integrally with (C). (P ₁ ) in the figure shows the trace of the nozzle into which the foam material was injected.

When the above-mentioned pad (P) is foam-formed, the trim cover (C) sewn in the shape of a bag is entirely air-permeable, so that it is not necessary to provide an air vent hole in the trim cover (C). .

FIG. 3 shows the state of penetration of the foam material for forming the pad (P) into the trim cover (C). Part of the foam material penetrates into and impregnates the gas-permeable foam B (2). A part of the ventilation hole (11) of the prevention film (1) reaches the gas permeable foam A (3) and is cured. (12) (1)
Reference numeral 2) denotes a cured portion that has leaked from the ventilation hole (11) into the gas permeable foam A (3) and has been cured.

The part that reaches the gas permeable foam (A) from this part of the air holes (11) is a part having a high foaming pressure, such as a part close to a nozzle for injecting foam material, or a gas permeable foam B (2). ) Depends on the bubble state. The foam material permeated into the gas permeable foam B (2) by the impregnation prevention layer (1) is prevented from being impregnated into the gas permeable foam A (3).

The air holes (1) of the impregnation preventing layer (1) are
Most of 1) are left open without being blocked by the foam material. Therefore, since the pad (P) has open-cell air permeability, the air holes (1) of the air-permeable foam B (2) and the impregnation prevention layer (1) are formed from inside the pad (P).
1) ... circulates to the outside through the air-permeable foam A (3) and the skin material (4).

[0018]

According to the present invention, the foam material for pad foam molding can be prevented from penetrating into the gas permeable foam A and the gas permeable skin material by the impregnation prevention layer, and the feel of the trim cover is not impaired. And a vent provided in the impregnation prevention layer,
Since the whole foamed article such as an armrest and a headrest has air permeability due to the air-permeable foam B, the air-permeable pad and the like, the pad and the air-permeable foam B have good cushioning properties.

[Brief description of the drawings]

FIG. 1 is a sectional view of a trim cover used in the present invention.

FIG. 2 is a sectional view showing an integral foamed product according to the present invention.

FIG. 3 is an enlarged view of a portion A in FIG. 2;

[Explanation of symbols]

 C Trim cover P pad 1 Impregnation prevention film 2 Breathable foam B 3 Breathable foam A 4 Skin material 11 Vent

Continuation of the front page (51) Int.Cl. ⁷ identification code FI B29L 31:58 B29L 31:58 (58) Field surveyed (Int.Cl. ⁷ , DB name) B29C 39/10-39/12 A47C 7 / 18-7/20 A47C 7/54 A47C 27/14-27/18 B32B 5/18-5/22 B68G 7 / 06,5 / 00

Claims (3)

(57) [Claims] 1. An integrally foamed product for a vehicle seat obtained by injecting foam material into a trim cover and integrally foam-molding a pad having air permeability, wherein the trim cover has a permeable skin material constituting a surface; An integrally foamed product for a vehicle seat, comprising a laminated body of a gas-permeable foam layer A, an impregnation prevention film formed by opening a large number of air holes in a non-gas-permeable film, and a gas-permeable foam B. Structure. 2. The structure of an integral foamed product in a vehicle seat according to claim 1, wherein a part of the air holes in the impregnation prevention film is closed with a foam material for pad molding. 3. The ventilation hole of the impregnation preventing film has an inner diameter of 0.5.
The monolithic foam structure for a vehicle seat according to claim 1, wherein the structure is from 50 to 60 mm per 100 square centimeters.