JPH06171003A - Reinforcing material for urethane from molding having unpleasant sound preventing capacity, production thereof and product - Google Patents

Abstract

PURPOSE:To produce a reinforcing and unpleasant sound preventing base fabric for urethane foam molding such as a sheet for a vehicle having high urethane reinforcing effect satisfying urethane barrier properties, unpleasant sound preventing properties and moldability, imparting the strong integration of urethane and a base fabric after molding and having high urethane reinforcing effect and to provide a high capacity moldable polyurethane sheet material using the base fabric. CONSTITUTION:At the time of production of an in-mold foamed molded object, bulky nonwoven fabric layers 1, 3 with a wt. basis of 30-200g/m<2> and voids of 90-94% are used as upper and lower layers and a dense nonwoven fabric layer 2 with a wt. basis of 20-100g/m<2> and voids of 87-91% is used as an intermediate layer and all of the layers are integrally laminated and a foamable urethane soln. is supplied to the bulky nonwoven fabric layers 1, 3 to be infiltrated in the nonwoven fabric layers and foamed to reinforce the nonwoven fabric layers to integrate the fabric layers with the formed polyurethane foam 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a urethane foam molding reinforcing material used for a vehicle seat and the like, and a method for manufacturing the same. In particular, it is generated by friction between a polyurethane foam of a seat material of a vehicle and a spring material. TECHNICAL FIELD The present invention relates to a urethane foam molding reinforcing material which prevents generation of rubbing noise, is excellent in quietness, and is also excellent in reinforcing effect, a method for producing the same, and a vehicle seat obtained by using the same.

[0002]

2. Description of the Related Art As a sheet material for vehicles and the like, a soft polyurethane foam in-mold foam molded article is mainly used.

In order for such a sheet material to realize a good cushioning property, in the sheet material structure shown in FIG. 3, which is generally used in many cases, the uppermost layer (A) in contact with the human body is used.
The layer) must be soft, but the next layer (B) should be a material with appropriate flexural rigidity or tension (high tensile modulus) so that it will receive the impact force when receiving layer B. The cushioning action of the spring (C layer) that absorbs and produces a spring sensation is required to have a structure and action that evenly disperse and keep the B layer flat and support it to move up and down.

Also, from the viewpoint of ensuring the durability of such a foamed product in a flexible polyurethane foam mold, it is avoided that the polyurethane foam is rubbed by the contact of the spring (coil spring) and locally damaged. For,
Conventionally, a reinforcing cloth has been put on the surface of the polyurethane foam contacting the spring material as described below to ensure good cushioning properties and durability.

That is, to give a typical example thereof, slab urethane and frosted gauze are used as a reinforcing material, slab urethane is installed so as to be in contact with the surface of the foam molding die, and frosted gauze is installed on the inside of the slab urethane and the urethane liquid is injected. However, a method of producing a soft polyurethane foam in-mold foam molded article in which a reinforcing layer is inserted by heating and pressurizing and foaming is often used, and it occupies the leading role.

The role of the slab urethane in this method is to impart rigidity to the obtained cushioning material and to prevent the foam die air vent hole from being blocked by the inflow of urethane, and the role of chills is to expand and expand the polyurethane. It is to form a superior reinforcing layer by improving the tensile elastic modulus by embedding and integrating the gauze into the polyurethane foam.

However, the rigidity improving effect of the slab urethane is insufficient, and above all, the number of man-hours is large and the work is complicated, and it is difficult for the kansai as a reinforcing cloth to conform to the cubic curved surface shape formed by the molded product. was there.

[0008] Next, a non-woven fabric (removed felt) has been developed and played a leading role for the purpose of solving the problem that it is difficult to conform to the shape of the above-mentioned cheesecloth and reducing the cost.

In order for this non-woven fabric to satisfy the required properties as a reinforcing fabric, it is necessary that it has a suitable permeability for the urethane liquid that expands and expands. For this purpose, it has pores and pores of a suitable pore size. It is necessary to have a ratio (apparent bulk density), and in order to provide sufficient reinforcing effect and rigidity, the non-woven fabric is embedded in the polyurethane that expands and expands, and the non-woven fabric intersection points are re-bonded with the polyurethane. , Non-woven fabric must be filled with polyurethane foam to have appropriate rigidity and appropriate apparent bulk density (porosity) to exert a high tensile elastic modulus. Furthermore, non-woven fabric structure is required to ensure conformability to the curved surface shape of molded products. It was necessary to make the adhesion between the fiber intersections relatively gentle so as to have the degree of freedom of tissue deformation.

From such a viewpoint, nonwoven fabrics having appropriate bulk density and porosity have been studied and developed by trial and error and used.

The criteria for setting the bulk density and porosity of these reinforcing non-woven fabrics are that the polyurethane that expands and expands permeates over the front face of the non-woven fabric, and that the non-woven fabric surface can be covered with a polyurethane film. It was selected in consideration of the fact that the permeability is too high and the polyurethane is suppressed to a level where it does not flow into the air vent hole of the molding die.

The above is the mainstream of the reinforcing fabric for in-mold expansion molding of flexible polyurethane foam.

However, under more gradual control, the necessary and sufficient permeability of polyurethane is stably secured, and the polyurethane is completely prevented from flowing into the air vent hole of the molding die, thereby producing with high yield and high productivity. In order to obtain a reinforcing cloth that is highly impregnated with urethane resin, has good permeability, contributes to increased rigidity and reinforcement, and has a high ability to integrate urethane foam and reinforcing cloth, a non-woven fabric layer for reinforcement with low bulk density and expansion A non-woven fabric for reinforcement was developed in which a non-woven fabric layer having a relatively high bulk density was provided as a shut-off layer to block the incoming polyurethane from flowing into the mold air vent hole. No. 26193).

Further, in order to reinforce the reinforcing effect and the effect of preventing the air vent holes from closing due to the inflow of polyurethane, a high basis weight non-woven fabric is used as a reinforcing base fabric to block the high reinforcing effect and the flow of polyurethane into the air vent holes due to the higher basis weight. In order to prevent this, one side of the high-density fabric is densified by embossing, etc.
The method disclosed in Japanese Patent Laid-Open No. 2-258332 is also invented and developed, in which the barrier layer is provided without being laminated and the polyurethane is more reliably prevented from flowing into the air vent hole. .

[0015]

With the recent trend toward high-end products, the functions required for a vehicle seat cushion material are not sufficient if only satisfying the excellent cushion function, which is achieved by the prior art. In addition to the functions, it is necessary to satisfy the requirements for satisfying environmental functions such as quietness, and it is strongly desired to suppress the generation of abnormal noise such as rubbing noise, bending, and refraction noise due to the friction between the flexible polyurethane foam foam molding and the spring material. It came to be.

However, obtained by the prior art,
The flexible polyurethane foam in-mold foam moldings, which currently occupy the mainstream and are produced in large quantities by the method described in the above item, have a surface in contact with the spring material covered with a polyurethane film that penetrates a reinforcing cloth. Although the skin layer exerts a reinforcing effect in combination with the reinforcing cloth and satisfies the product function as it is, it is necessary to avoid generation of scratching noise due to friction between the polyurethane skin layer and the spring material. There is no.

Furthermore, the improved product obtained from Japanese Utility Model Publication No. 62-26193 cannot sufficiently satisfy the urethane barrier property only by integrating two layers of non-woven fabric, and abnormal noise is caused by contact with a coil spring after molding. There is a problem that it occurs. Further, the one disclosed in JP-A-2-258332 (1) has a basis weight of 110 to 800 g / m ² , a fiber diameter of 1
Nos. 16 to 16d, a foam-forming reinforcing material base cloth composed of a high-density nonwoven fabric, (2) a foam-forming reinforcing material base cloth having a pressure-bonding layer on one surface side of (1) have been proposed. In terms of the structure, it is necessary to increase the basis weight of the base fabric in order to satisfy the appropriate urethane impregnation property and high urethane barrier property, and as a result, there is a problem that the weight of the molded product increases. Since the structure of (2) has a pressure-bonding layer, the urethane-blocking property is superior to that of (1) under the same basis weight, but only one-sided pressure-bonding layer can satisfy the high urethane-blocking property. As in (1), it is necessary to increase the basis weight of the base fabric, resulting in a problem that the weight of the molded product increases. In addition, the high-density non-woven fabric layer that blocks the polyurethane that is about to flow out is in the outermost layer and is in contact with the spring material, which causes a crispy (bending / refraction) abnormal noise that occurs when the paper-like object is bent. Is unavoidable.

In order to solve the above-mentioned problems, that is, the problems that the urethane barrier property is insufficient, the abnormal noise is generated, and the urethane barrier property is increased, the basis weight of the base fabric is also increased. In particular, in urethane foam molding of vehicle seats, etc., where urethane blocking is strongly required due to the generation of abnormal noise, urethane blocking performance and noise prevention and moldability are satisfied, and a strong urethane and base fabric after molding We do not provide reinforcement for urethane foam molding such as vehicle seats that have a great effect of reinforcing urethane and noise-preventing base fabric, its manufacturing method, and high-performance moldable polyurethane sheet material using the same. It is what

[0019]

[Means for Solving the Problems] In order to suppress the generation of abnormal noise, and to impart an excellent reinforcing effect and excellent workability, a flexible polyurethane foam in-mold foam molded article reinforcing material (nonwoven fabric) has voids shown in FIG. It is necessary to have a three-layer laminated structure of nonwoven fabrics having different rates.

In FIG. 1, 1 is a basis weight 30 to 20.
A bulky non-woven fabric layer with 0 g / m ² and a porosity of 90 to 94%, sufficient basis weight to obtain the integrity of the strong base material and urethane, suitable voids in the layer, and moderate on the surface in contact with urethane. It is a non-woven fabric with a smooth fluff. 2 is basis weight 2
The nonwoven fabric is a dense nonwoven fabric layer having 0 to 100 g / m ² and a porosity of 87 to 91% and having a good urethane barrier property. The third layer is a non-woven fabric similar to the first layer and contributes to the urethane barrier property together with the second layer, and at the same time, has a function of preventing the generation of abnormal noise due to the contact between the urethane layer and the coil spring or the like. And with a layer to strengthen the bond with polyurethane foam, 4
Is the foam-molded product reinforcing material of the present invention in which these three layers are laminated and integrated.

FIG. 2 shows a part of a cross section of a flexible polyurethane foam in-mold foam molded article manufactured by using this reinforcing base cloth.

In FIG. 2, 1 is a bulky non-woven fabric layer for preventing abnormal noise, and 2 is a dense reinforcing non-woven fabric layer containing polyurethane filled with polyurethane that has been foamed and permeated in the foaming mold. 5 is a polyurethane foam layer.

The functions required for such a reinforcing material (nonwoven fabric) for in-mold expansion molding of a flexible polyurethane foam which has an excellent reinforcing effect in which generation of abnormal noise is suppressed and is excellent in workability are as follows.

During the in-mold foam molding, the urethane resin that expands and expands can be evenly impregnated and filled, and the urethane foam and the reinforcing material have a urethane resin permeability sufficient to firmly integrate them. Do not have excessive permeability.

Since the reinforcing material follows the shape of the in-mold foamed molded article and retains excellent molding ability, the bonding between the inter-fiber intersection points of the non-woven fabric is not strong but gently bonds with the structural structure which is flexible to the structural deformation. Must be a structure

In order to exert a sufficient reinforcing effect, the bulk density of the non-woven fabric should be as high as possible to the extent that urethane resin can be impregnated and filled during in-mold foam molding.

In order to prevent generation of scratching noise on the contact surface with the spring portion and generation of abnormal noise such as bending noise, the spring does not directly contact the urethane foam and has a relatively low bulk density (relatively high void volume). Since it is necessary to have a structure that comes in contact with a non-woven fabric, and it is also necessary to make it a unified structure with a reinforced urethane foam,
With a relatively low porosity (relatively high bulk density) that functions as a reinforcing and urethane resin permeation, inflow barrier woven fabric layer and a relatively low bulk density (relatively high porosity) non-woven noise prevention nonwoven fabric It is required to form an integrated structure in which the layers are laminated.

The permeability of the urethane resin at the time of in-mold foam molding specified in the item is a value determined by the pore size and the porosity (apparent bulk density) of the reinforcing nonwoven fabric, and the porosity is properly selected. By doing so, the polyurethane resin that expands and expands in the foam molding die is included and filled in the reinforcing material, but it is suppressed to a slight amount without flowing out to the outside (upper surface) of the reinforcing nonwoven fabric layer in large quantities. It turned out that it is possible to control.

Then, as a result of experimentally selecting this appropriate value, it was found that a porosity of 87 to 91% is appropriate.

The porosity (apparent bulk density) is
It is a property that is highly relevant to the reinforcing performance specified in paragraph, and the higher the bulk density and the shorter the distance between the fibers constituting the nonwoven fabric, the more dense the filling of the polyurethane resin into the nonwoven fabric structure during in-mold foam molding. Is performed and contributes to the increase in rigidity,
In addition, since a high tensile modulus can be obtained by re-adhesion between the intersections due to the urethane resin that is impregnated and impregnated, the urethane resin can be impregnated and filled during in-mold foam molding, and the apparent bulk is as high as possible. It is desirable to select the density of the reinforcing non-woven fabric so that the reinforcing base cloth bulk density (porosity) for satisfying the permeability meets the selection criteria and does not include contradictory elements and the porosity is 87 to 91%. Performing porosity selection gives good results in all.

Considering the case where the porosity is selected to be larger than 91%, in this case, the expanding polyurethane resin permeates the reinforcing non-woven fabric layer, overflows to the upper surface thereof, and causes a trouble of flowing into the air vent hole. Or, when a nonwoven fabric layer is laminated on the reinforcing cloth, it flows into the nonwoven fabric layer,
It will flow into the non-woven fabric layer for preventing abnormal noise and kill its effect.

On the contrary, when the porosity is selected to be less than 87%, it becomes difficult to impregnate the reinforcing non-woven fabric layer with the polyurethane resin, resulting in insufficient bonding between the reinforcing non-woven fabric layer and the polyurethane foam layer.

In order to secure the molding performance specified in the above item, it is necessary to gently bond the reinforcing non-woven fabric between the intersections.
Adhesion between the intersections of the reinforcing material fibers without affecting the reinforcing effect is completed by the urethane resin that penetrates and is impregnated during in-mold foam molding to complete the final bond, which is a strong bond that impairs molding performance. It is not necessary to carry out in advance.

As a result of experiments, it is desirable that the non-woven fabric layer used for the abnormal noise prevention layer be bulky and have cushioning properties, and it is necessary that no abnormal noise is generated during bending. It has been clarified that a large one having a large weight and a large weight is required, and it is clear that the one having a weight of 30 to 200 g / m ² and a porosity of 90 to 94% should be selected.

Based on the results of such functional analysis, the present invention provides the abnormal noise preventing layer with a basis weight of 30 to 200 g /
A bulky non-woven fabric with a porosity of 90 to 94% at m ² is used as a reinforcement layer and urethane resin permeation, and an inflow barrier layer.
A dense non-woven fabric layer having a porosity of 87 to 91% at 0 to 100 g / m ² is used as a reinforcing layer / polyurethane foam and a reinforcing interlayer joint reinforcing layer, and a basis weight of 30 to 200 g / m ²
Then, a bulky non-woven fabric having a porosity of 90 to 94% was applied, and these three layers were laminated and integrated to form a reinforcing material for urethane foam molding having a laminated structure that achieves a desired function.

The non-woven fabric of the present invention may be either spun-bonded non-woven fabric or short-fiber non-woven fabric as long as the above conditions are satisfied, and the constituent fiber material is not limited at all. In addition, heat resistance (low heat shrinkage) that does not cause heat shrinkage during in-mold foam molding is required.

However, it is more preferable to use a spunbonded nonwoven fabric composed of long fibers for the reinforcing nonwoven fabric layer because the reinforcing effect is high.

These predetermined porosities (apparent bulk density)
It is possible to manufacture a non-woven fabric laminate having the above-mentioned, and laminating and integrating non-woven fabrics having different apparent bulk densities (porosity) by appropriately selecting and combining the following methods.

The apparent bulk density (porosity) of the non-woven fabric depends on the denier of the non-woven fabric constituent fibers, the presence or absence of crimp, the shape of the crimp, the adhesion state (condition), the entangled state (condition), press conditions such as calendering, etc. Since it is determined, a non-woven fabric having a predetermined apparent bulk density can be manufactured by selecting the conditions that match the purpose.

Generally, in order to obtain a non-woven fabric having a high apparent bulk density, use of low denier fiber, high needle density and deep needle depth during entanglement with a needle punch, and temperature and pressure during calendering. It is effective to raise it.

In order to produce a laminated non-woven fabric having a unitary structure, a. By stacking two types (different types) of webs and performing needle punching, it is possible to obtain a non-woven web that is laminated and integrated by mechanical entanglement.

This web is manufactured as it is or by impregnating it with an adhesive and drying it into a product, or if the web-constituting fibers are composed of composite fibers or heat-fusible fibers, they are heat-bonded into a product.

B. It can be manufactured by applying an adhesive to the joining surfaces of two kinds of webs, laminating them and joining them.

At this time, the adhesive is applied to the coating of the adhesive solution (emulsion), the intercalation of the hot melt adhesive sheet (nonwoven fabric sheet, film) or the like, and dried or heat-treated to perform the joining.

When the non-woven fabric-constituting fiber itself is composed of a composite fiber or includes a heat-fusible fiber, it is possible to join and integrate them by directly heat-treating the laminated body of both.

Next, the present invention will be described in detail with reference to Examples in order to specifically show the embodiments.

[0047]

Example A spun bond similar to the non-woven fabric 1 in which a web having a basis weight of 80 g / m ² of a random loop structure made of polyethylene terephthalate fiber of 3 denier produced by the spun bond method was provisionally thermocompression bonded by calendering with a heat roll at 170 ° C. FPD1 manufactured by Organ Co. was laminated with a non-woven fabric 2 which was thermocompression-bonded by calendering a web having a random loop structure of 40 g / m ² composed of 1.5 denier polyethylene terephthalate fiber produced by Using a -40S needle, needle punching at a needle density of 40 / cm ² and a needle depth of 14 mm is performed, and the nonwoven fabric 3 produced under the same production conditions as the nonwoven fabric 1 is overlaid on the nonwoven fabric 2 side of the obtained two-layer laminated structure nonwoven fabric, Furthermore, using the needle of Organ FPD1-40S Density 40 / cm ² , needle depth 14m
Needle punching with m, entanglement and three layers are integrated to obtain a nonwoven fabric 4 for reinforcing a molded product shown in FIG.

As a result of the measurement of the nonwoven fabric 2, the different soundproofing nonwoven fabric layers composed of the nonwoven fabrics 1 and 3 in FIG.
2%, the void ratio of the nonwoven fabric layer consisting of nonwoven fabric 2 is 88
%Met.

The obtained non-woven fabric 3 for reinforcing the foamed product inside the polyurethane foam is placed in the metal mold for foaming molding.
Face the upper surface of the mold, that is, the direction of the air vent hole, and set the other non-woven fabric 1 surface to the mold with the foamable urethane resin addition side, add the foamable urethane resin as usual, and heat and pressurize it under pressure. Polyurethane foam molding was performed to prepare a soft polyurethane foam in-mold foam molded article.

Laminated nonwoven fabric 3 in the obtained molded product
In order to check the permeation and permeation state of the polyurethane resin into the polyurethane foam layer and the bonding state between the polyurethane foam layer and the laminated structure nonwoven fabric 3, the obtained molded product was cut, the cross-sectional state was observed, and the polyurethane foam layer and the laminated structure nonwoven fabric 3 were observed. The interbonding strength was examined.

As a result of the observation, the expanded and expanded polyurethane resin evenly permeates and fills the first and second layers of the non-woven fabric, and slightly permeates the non-woven fabric 1 side in the second non-woven fabric layer to approximately 90% and fills. As a result, it has not penetrated into one layer of the non-woven fabric, indicating that the desired ideal state was achieved.

Further, regarding the bonding strength between the polyurethane foam layer and the nonwoven fabric 3 having a laminated structure, it was shown that the polyurethane foam layer was broken before the boundary surface was peeled off, and sufficient bonding was performed.

Further, in the abnormal noise generation model test in which one surface of the nonwoven fabric which is the abnormal noise generation preventing layer is brought into contact with the coiled spring and pressure and depressurization are repeated, generation of abnormal noise was not detected at all. Comparative Example The reinforcing non-woven fabric 1 layer in the example was omitted, and the non-woven fabric layer 2 was constituted by only 3 layers, and the void ratio of the non-woven fabric layer 2 was 8
A sample changed to 3% and a non-woven fabric layer having an overall porosity of 95% were used to form a flexible polyurethane foam in-mold foam molded product in the same manner as in the example, and the polyurethane resin for the laminated structure non-woven fabric 3 in the molded product was prepared. The state of permeation and permeation and the state of bonding between the polyurethane foam layer and the laminated structure nonwoven fabric 3 were observed.

The observation result shows that in the sample having a porosity of 95% as a whole, the expanded and expanded polyurethane resin may partially permeate the non-woven fabric layer and overflow to the outside to block the air vent hole of the molding die. Shows that the polyurethane resin reaches the surface layer of the non-woven fabric and has no noise suppressing effect. In the sample in which the void ratio of the two layers of the non-woven fabric for the reinforcing layer is changed to 83%, the polyurethane resin for the two non-woven fabrics of the reinforcing layer is shown. There was a part where the permeation and impregnation were insufficient, and there was a part where the bonding between the polyurethane foam layer and the laminated structure nonwoven fabric 3 was partially insufficient.

The porosity in the present invention is 20 g.
It is a percentage display of the apparent void density calculated using the thickness of the nonwoven fabric when a load of / cm ² is applied and the effective void volume of the nonwoven fabric calculated from the density of the fibers constituting the nonwoven fabric.

[0056]

The bulky non-woven fabric layer having a basis weight of 30 to 200 g / m ² and a porosity of 90 to 94% provides an intermediate layer having a basis weight of 20 to 100 g / m ² and a porosity of 87 to 9
By using a three-layer structure nonwoven fabric in which 1% dense non-woven fabric layers are sandwiched and laminated and integrated as a reinforcing material for a flexible polyurethane foam in-mold foam molded article,
The ability to prevent abnormal noise is imparted, and the urethane foam molded article is imparted with appropriate rigidity and excellent tensile elastic modulus.

Further, in the production method thereof, in urethane foam molding, the urethane foam has a basis weight sufficient to obtain the integrity of the strong reinforcing agent and the urethane, an appropriate void in the layer, and an appropriate amount on the surface in contact with the urethane. After passing through a layer with a fluff, it reaches a dense layer with a high urethane blocking property at an early stage, and the urethane that could not be blocked by that layer is completely blocked by the next third layer. With a relatively low basis weight, a high urethane barrier property is obtained without impairing moldability, satisfying the prevention of abnormal noise, and the base cloth and urethane are firmly integrated, that is, urethane with a large urethane reinforcing effect. Enables foam molding. Then, as the product, it is possible to obtain a vehicle seat or the like having excellent cushioning performance based on imparting an excellent tensile elastic modulus and good sitting comfort and excellent durability due to an excellent reinforcing effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a reinforcing base fabric of the present invention.

FIG. 2 is a cross-sectional view of a polyurethane foam in-mold foam molded product manufactured using the reinforcing base fabric of the present invention.

FIG. 3 is a cross-sectional view of a flexible polyurethane foam in-mold foam molded product.

[Explanation of symbols]

 1 Bulky Nonwoven Layer 2 Dense Nonwoven Layer 3 Bulky Nonwoven Layer 4 Reinforcement Base Fabric for Foam Molded Products 5 Polyurethane Foam Layer A Polyurethane Foam Layer B Reinforcement Layer C Spring

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication location B29L 31:58 4F (72) Inventor Takeshi Inoue 10-24 Toyocho, Tsuruga City, Fukui Prefecture Toyobo Co., Ltd. Ceremony company Tsuruga factory (72) Inventor Sadakuni Shioya 982 Kaneda, Atsugi-shi, Kanagawa Toyo Soflan Co., Ltd. Main office (72) Inventor Shigeru Inage 982 Kaneda, Atsugi-shi, Kanagawa Toyoso Franc Co., Ltd.

Claims (3)

[Claims] 1. A bulky nonwoven fabric layer having a basis weight of 30 to 200 g / m ² and a porosity of 90 to 94% is used as the upper and lower layers, and a dense nonwoven fabric layer having a basis weight of 20 to 100 g / m ² and a porosity of 87 to 91% is intermediate. A reinforcing material for urethane foam molding having a laminated structure, which is laminated and integrated as a layer. 2. In producing an in-mold foamed article, a bulky nonwoven fabric layer having a basis weight of 30 to 200 g / m ² and a porosity of 90 to 94% is used as upper and lower layers, and a basis weight of 20 to 100 g.
/ It is no porosity 87 m ² by laminating a dense non-woven layer of 91% as an intermediate layer integrally, the supply bulky nonwoven fabric side foamable urethane solution, and urethane impregnated foamed into the nonwoven layer A method for producing a urethane foam molding reinforcing material, which comprises reinforcing and integrally forming with a polyurethane foam to be formed. 3. A bulky nonwoven fabric layer having a basis weight of 30 to 200 g / m ² and a porosity of 90 to 94% is used as the upper and lower layers, and a dense nonwoven fabric layer having a basis weight of 20 to 100 g / m ² and a porosity of 87 to 91% is intermediate. A vehicle seat made of a urethane foam molding reinforcing material laminated and integrated as a layer.