JP6154345B2 - Automotive seat components - Google Patents

Description

  The present invention relates to an automobile seat sheet member made of a thermoplastic resin expanded particle molded body in which a reinforcing member is embedded.

  2. Description of the Related Art In recent years, automotive seat sheets have been used in which a reinforcing member made of metal or the like is embedded in a thermoplastic resin foam particle molded body (hereinafter simply referred to as a foam molded body) and fused and integrated. ing. The reinforcing member embedded in the foamed molded body is embedded as a structural body frame for attachment to a vehicle body, a seat arrangement, a reinforcing material at the time of a collision, or the like.

  As a member obtained by fusing and integrating such a foam molded body and a reinforcing member, it has so far been composed of a base foam resin layer and a reinforcing member disposed on or inside the base foam resin layer. There has been proposed a composite foamed molded article in which a foamed resin foam layer covering a reinforcing member and a base foam resin layer are engaged or engaged / fused (for example, see Patent Document 1).

  Such a composite foamed molded body is manufactured by, for example, disposing a reinforcing member at a predetermined position in a mold, filling the foamed particles constituting the base, and heating and fusing. .

JP-A-5-154929

  In general, a foamed molded product undergoes mold shrinkage after in-mold molding using a mold. Therefore, it is necessary to recover the size of the foamed molded product through a curing process. It took time. Further, when a foam molded body obtained by fusing and integrating a foam molded body having such characteristics and a reinforcing member is used as an automobile seat sheet member, the reinforcing member itself is bent due to the shrinkage of the foam molded body. There was a case. If the reinforcing member is bent, it may be difficult to recover the foamed molded product to its original shape even after a curing process, warping may occur, and target dimensional accuracy may not be obtained. There is a possibility that problems such as poor accuracy of mounting on the camera and inability to secure predetermined performance may occur.

  As a measure for solving these problems, the shrinkage rate after molding of the foam molded body is predicted in advance, and the foam molded body and the reinforcing member are previously warped in the reverse direction, and there is no warpage after shrinkage. A method of forming a shape is conceivable.

  However, the shrinkage rate of the foamed molded product after molding varies depending on the type of thermoplastic resin foam particles used, the manufacturing conditions, the material of the reinforcing member, etc., so the amount of warpage of the foamed particle molded product is set each time. There was a need to do. Further, there is a problem in that it is necessary to design the mold to be used each time, so that the number and types of molds are enormous, and the reproducibility is poor and not suitable for mass production.

  The present invention has been made in order to solve the above-described problems, and is an automobile seat comprising a thermoplastic resin foamed particle molded body in which a reinforcing member is fused and integrated, which has less warpage and extremely excellent dimensional accuracy. It is an object to provide a sheet member.

According to the present invention, the following vehicle seat member is provided.
<1> An automotive seat sheet member comprising an integrally molded body in which a reinforcing member is embedded in a thermoplastic resin foam particle molded body, wherein the thermoplastic resin foam particle molded body has an upper surface, or an upper surface and a lower surface. A seat member for an automobile, wherein at least one slit recessed in the thickness direction is formed at a location where the reinforcing member is embedded so as to intersect the reinforcing member.
<2> The slit is formed from the upper surface of the thermoplastic resin foamed particle molded body, and the length in the thickness direction from the bottom of the slit formed on the upper surface of the thermoplastic resin foamed particle molded body to the reinforcing member ( <1> characterized in that a) (mm) and the length (b) (mm) in the thickness direction from the lower surface of the thermoplastic resin expanded particle molded body to the reinforcing member satisfy the following formula (1): 2. A seat member for an automobile according to 1.
| A−b | ≦ 100 mm (1)
<3> The slit is formed from the upper surface and the lower surface of the thermoplastic resin foam particle molded body, and the length in the thickness direction from the bottom of the slit formed on the upper surface of the thermoplastic resin foam particle molded body to the reinforcing member (A) (mm) and the length (c) (mm) in the thickness direction from the bottom of the slit formed on the bottom surface of the thermoplastic resin foam particle molded body to the reinforcing member satisfy the following formula (2) The vehicle seat member according to <1>, wherein
| A-c | ≦ 100 mm (2)
<4> Any one of <1> to <3>, wherein the slit is formed at a position that equally divides the length in the longitudinal direction in a direction perpendicular to the longitudinal direction of the seat member for an automobile A seat member for an automobile according to claim 1.
<5> The automobile seat member according to any one of <1> to <4>, wherein the reinforcing member is a metal member.
<6> The automotive seat sheet member according to any one of <1> to <5>, wherein the plastic resin foamed particle molded body is a polypropylene resin foamed particle molded body.

  ADVANTAGE OF THE INVENTION According to this invention, the seat sheet | seat member for motor vehicles formed by fuse | melting and integrating the thermoplastic resin foaming particle molded object and the reinforcement member with few curvature and the outstanding dimensional accuracy is obtained.

(A)-(D) are explanatory drawings of the seat sheet member for motor vehicles concerning Examples 1-4, respectively. It is explanatory drawing of the typical shaping | molding apparatus for manufacturing the seat sheet member for motor vehicles based on this invention. It is explanatory drawing of the seat sheet | seat member for motor vehicles formed by melt-integrating the thermoplastic resin expanded particle molded object and the reinforcement member based on this invention. It is explanatory drawing of the seat sheet member for motor vehicles which formed the slit in the upper surface based on this invention. It is explanatory drawing of the seat sheet member for motor vehicles which formed the slit in the upper surface and lower surface based on this invention. (A) is explanatory drawing (state in which curvature does not generate | occur | produce) of the curvature of the conventional seat member for motor vehicles. (B) is explanatory drawing (state in which curvature has generate | occur | produced) of the curvature of the conventional seat member for motor vehicles. (A) is explanatory drawing of the measuring method of the curvature of the product edge part of the seat sheet member for motor vehicles. (B) is explanatory drawing of the measuring method of the difference from the normal dimension of the product edge part of the seat member for motor vehicles.

  Hereinafter, the seat seat member for automobiles of the present invention will be described in detail.

  The automotive seat sheet member of the present invention is an automotive seat sheet member formed of a foam molded body in which a reinforcing member is embedded, and is recessed from the upper surface or the upper surface and the lower surface of the foam molded body in the thickness direction. This is a seat member for automobiles in which at least one slit is formed.

  The thermoplastic resin constituting the foamed molded product can be appropriately selected. For example, polystyrene resins, polyolefin resins such as polyethylene and polypropylene, polybutylene succinates, polyester resins such as polyethylene terephthalate and polylactic acid, polycarbonate In addition, a composite resin of a polystyrene resin and a polyolefin resin can be used.

  In the present invention, the effect of preventing warpage is particularly exerted when using a polyolefin-based resin which is a crystalline resin and easily shrinks. From the above viewpoint, a polyethylene resin and a polypropylene resin are more preferable, and a polypropylene resin is more preferable.

  The foamed particles can be produced by a known method for producing this kind of foamed particles. For example, if necessary, a surfactant is added to a required amount of dispersion medium (usually water) in a pressurized container such as an autoclave to disperse the resin particles, and a foaming agent is injected and stirred under heating. Then, the resin particles are impregnated with the foaming agent, and after a predetermined time, the resin particles impregnated with the foaming agent together with the dispersion medium from the container under the high temperature and high pressure conditions are discharged into a low pressure region (usually under atmospheric pressure) and foamed. It is manufactured by a method for obtaining expanded particles. In this way, the foamed particles previously foamed are filled in the mold and then subjected to in-mold molding by introducing heated steam, the foamed particles are secondary foamed and the foamed particle surface is melted and integrated, A foamed molded product can be obtained. At this time, the reinforcing member is placed in a predetermined position in the mold and molded in-mold, whereby the reinforcing member and the foam particles are fused and integrated, and the foam molded body in which the reinforcing member is embedded is integrated. Obtained as a molded body.

  The reinforcing member used in the present invention is not particularly limited as long as it is usually used as a reinforcing member for an automobile seat sheet member, for example, a metal reinforcing member made of iron, aluminum, copper, etc., engineering plastic, Examples thereof include a resin reinforcing member made of glass fiber reinforced resin. Among these, those made of metal are preferable from the viewpoint of strength and the like. The shape is preferably linear, tubular, or rod-shaped, and preferably has a diameter of 2 to 20 mm.

  Further, the shape of the reinforcing member is not particularly limited as long as it is a shape that functions as a mounting to a vehicle body or a reinforcement at the time of a collision, but it is preferably at least embedded in one side of the foam molded body. More preferably, the seat is embedded in the longitudinal side of the seat. Further, it is preferable that the reinforcing member is embedded in a range covering at least 30 to 95% of the seat seat when the length in the longitudinal direction of the seat is 100%, and embedded in a range covering 50 to 90%. More preferably. Normally, when used as an automobile seat seat, as shown in FIGS. 1A to 1D, reinforcement that can reinforce each side and four corners when the automobile seat sheet member is viewed from above. It is desirable that the member 2 has a shape in which a pipe or the like is formed into a rectangular shape in accordance with the shape of the seat.

The automobile seat sheet member of the present invention is formed from a foamed molded body 1 in which the reinforcing member 2 is integrally formed with the foamed particles, and the reinforcing member 2 is embedded.
Below, the formation process of the seat sheet member for motor vehicles of this invention is demonstrated in detail using FIG.

  FIG. 2 shows a typical molding apparatus used in the production of the seat member for an automobile of the present invention. The molding device 5 is composed of a mold 6 for molding a seat member for an automobile and a steam chamber 7, and an injector 8 for filling foam particles is attached to the mold 6, and heating steam is also provided. A core vent 9 is provided for air permeation and air discharge.

  The metal mold 6 is made of a material having good heat conductivity and made of metal, for example, one made of iron, aluminum or the like.

  The manufacturing process of the seat member for automobiles includes the steps of disposing the reinforcing member 2, filling the foamed particles, heating, cooling, and releasing.

  First, as the arrangement of the reinforcing member 2, the reinforcing member 2 is arranged on one side of the mold 6 and the mold is clamped. Next, the foamed particles are filled into the mold 6 from the injector 8. The expanded particles may be in a state in which a pressurized gas is infiltrated into the inside in advance to give an internal pressure, or may be filled in a state in which no internal pressure is applied.

  In this state, the heated steam 10 is supplied into the steam chamber 7, the heated steam 10 is introduced into the mold 6 through the core vent 9 of the mold 6, the foamed particles are secondarily foamed, and the space between the foamed particles is increased. The gap is filled and fused together. Note that the temperature at which the foamed particles are secondarily foamed and fused to each other varies depending on the type and characteristics of the foamed particles to be used. When the temperature of the heating steam 10 is too high, shrinkage of the obtained foamed molded body 1 tends to be too large. Accordingly, steam of approximately 0.02 to 0.5 MPa (G) is used. By this heating step, the foam molded body 1 is formed in the mold, and the fusion molded body 1 is fused and integrated with the reinforcing member 2 embedded in the foam molded body 1.

  Next, after the mold 6 is cooled, it is released and taken out from the mold 6 to obtain a molded automobile seat sheet member. In addition, in the automobile seat sheet member manufactured by the above-described method of the present invention, the foamed molded body 1 and the reinforcing member 2 may be integrally formed. For example, for mounting on a vehicle body, and for automobiles. In order to attach another member to the seat member, a part of the reinforcing member 2 may be exposed from the foam molded body 1.

  As shown in FIG. 3, the shape of the automobile seat member is preferably a molded body shape in which the portion 33 in contact with the thigh of the occupant is thick and the portion 34 in contact with the buttocks is thin. The thickness of the sheet member of the portion 34 in contact with the collar portion is preferably 0 to 100 mm, and more preferably 5 to 70 mm. The reason why the thickness is 0 mm is that a part of the holes may be provided. In addition, the difference between the thickness of the seat member 34 in the portion 34 in contact with the buttocks and the thickness of the portion 33 in contact with the thigh is preferably 20 to 200 mm, and preferably 30 to 170 mm in order to prevent the occupant from slipping out. More preferred.

  When the thickness of the automobile seat member is uneven as described above, when the reinforcing member 2 is integrally formed as a frame over the four sides of the foam molded body 1, the reinforcing portion is located at the central portion in the thickness direction of the foam molded body 1. It may be arranged at a location that is not located or at a location that is biased to either the top or bottom in the thickness direction.

  In such a case, in the portion where the reinforcing member 2 exists, the foamed particles are restrained by the reinforcing member 2 and the shrinkage amount tends to decrease, whereas in the portion where the reinforcing member 2 does not exist, the shrinkage amount increases. For example, if the reinforcing member 2 exists in a position deviated toward the lower surface side in the thickness direction of the foam molded body 1, the shrinkage on the upper surface side of the foam molded body 1 becomes large.

  That is, the foamed molded body 1 forming the automobile seat sheet member 1 starts to contract from the time when it is taken out from the mold, and warpage occurs depending on the position of the reinforcing member 2 embedded in the foamed molded body 1. For example, as shown in FIG. 6A, when the reinforcing member 2 is embedded near the lower surface of the foam molded body 1, the upper portion 31 of the foam molded body 1, which is a thick part at the top of the reinforcing member 2, is used. When the amount of shrinkage is larger than the amount of shrinkage of the lower portion 32 of the foam molded body 1 which is a thin portion of the lower portion of the reinforcing member 2, warping occurs on the upper side after molding as shown in FIG. There is.

  In the present invention, in order to reduce the variation in the amount of shrinkage at a specific location of the foamed molded body 1 caused by the reinforcement member 2 being embedded, the reinforcement member 2 considered to have a large shrinkage amount is embedded. The present inventors have found that the deformation can be alleviated by forming the slits 4 that are recessed in the thickness direction from the upper surface or the upper surface and the lower surface of the foam molded body 1 at the locations.

  That is, in the present invention, in order to suppress the occurrence of such warpage, at least one slit 4 that is recessed in the thickness direction from the upper surface or the upper surface and the lower surface of the foam molded body 1 has the reinforcing member 2. Is formed so as to intersect with the reinforcing member 2 at a portion where is embedded. By forming the slit 4, the force applied by the contraction is divided and relaxed through the slit 4, and the deformation amount of the foam molded body 1 can be reduced. Furthermore, in order to efficiently reduce the deformation amount of the foam molded body 1, it is necessary to form the slits 4 so as to intersect the reinforcing member 2.

  In the present invention, the upper surface means the surface on the seating surface side of the seat member for automobiles, and the lower surface means the surface on the opposite side.

  In the seat member for automobiles, the reinforcing member 2 is often located on the lower surface side in the thickness direction of the foam molded body 1, so that the slit 4 is formed at least on the upper surface of the foam molded body 1 on the upper surface side of the reinforcing member 2. It is preferable.

The depth of the slit 4 formed in the foam molded body 1 in the present invention is the length in the thickness direction from the bottom of the slit 4 formed on the upper surface of the foam molded body 1 to the reinforcing member 2 as shown in FIG. It is preferable that (a) (mm) and the length (b) (mm) in the thickness direction from the lower surface to the reinforcing member 2 satisfy the following formula.
| A−b | ≦ 100 mm (1)

  That is, the length (a) (mm) in the thickness direction from the bottom of the slit 4 formed on the upper surface of the foam molded body 1 to the reinforcing member 2 and the length (b) in the thickness direction from the lower surface to the reinforcing member 2 ( mm), the difference in force applied by the shrinkage that is different between the upper surface and the lower surface of the reinforcing member 2 can be reduced, so that the warpage of the foam molded body 1 can be further reduced. .

From the above viewpoint, preferably,
| A−b | ≦ 80 mm (2)
And more preferably
| A−b | ≦ 60 mm (3)
And more preferably
| A−b | ≦ 40 mm (4)
It is.

  On the other hand, when the thickness of the seat member for an automobile is large, as shown in FIG. 5, when the slit 4 is formed from the upper surface and the lower surface of the foam molded body 1 toward the reinforcing member 2, Since it becomes easier to control the amount of shrinkage that occurs, it is easy to reduce the warpage of the foamed molded article 1. By forming the slit 4 under such conditions, the force applied to the reinforcing member 2 due to the shrinkage of the foam molded body 1 is dispersed, and the warpage of the foam molded body 1 and the reinforcing member 2 can be suppressed.

In this case, the length (a) (mm) in the thickness direction from the bottom of the slit 4 formed on the upper surface of the foam molded body 1 to the reinforcing member 2 and the bottom of the slit 4 formed on the lower surface to the reinforcing member 2. It is preferable that the length (c) (mm) in the thickness direction satisfies the following formula.
| A-c | ≦ 100 mm (5)
Preferably,
| Ac- ≦ 80 mm (6)
And more preferably
| Ac | ≦ 60 mm (7)
And more preferably
| Ac | ≦ 40 mm (8)
It is.

  In addition, when forming the slit 4 from the upper surface and the lower surface of the foam molded body 1 toward the reinforcing member 2, the upper surface and the lower surface of the slit 4 can be formed at a pair of opposing positions. The slit 4 on the lower surface may be formed in the middle of the two slits 4 formed. In such a case, it is preferable that the lengths (a) and (c) satisfy the above formula with respect to the space between the adjacent slits 4.

  The direction in which the slit 4 is formed is appropriately set according to the shape and size of the automobile seat member to be manufactured so as to intersect with the reinforcing member 2. Crossing here means a state in which the reinforcing member 2 is observed crossing the slit 4 in a two-dimensional plane in which the automobile seat member is observed from above. However, in the seat member for automobiles, warping is likely to occur at the portion where the reinforcing member 2 of the seat member for automobiles is embedded. Therefore, the seat member is formed in a direction perpendicular to the reinforcing member 2 of the seat member for automobiles. Is preferred.

  Moreover, it is preferable to form the position which forms the slit 4 in the position which divides the length of the longitudinal direction of a seat sheet member for motor vehicles equally, and may be formed in the position which divides the longitudinal direction of a seat member into 2 equal parts. However, a larger number of slits 4 may be formed, and the slits 4 may be formed at positions that are equally divided into three or more.

  As shown in FIG. 1, when the reinforcing member 2 is rectangular, the length of the slit 4 to be formed is that the slit 4 is formed in the vertical direction at least on the upper surface side of the portion where the reinforcing member 2 is embedded. preferable. That is, as shown in FIG. 1 (C), it may be formed long so as to straddle two reinforcing members 2, or as shown in FIG. 1 (A), it may be formed short so as to straddle one reinforcing member 2. Also good. From the above viewpoint, the length of the slit 4 is preferably 50 mm or more and more preferably 100 mm or more across the reinforcing member 2.

  The number of slits 4 to be formed can be appropriately set according to the shape and size of the automobile seat sheet member to be manufactured. It is also possible to form three or more as in 1 (B).

  The slit 4 formed in the automobile seat sheet member of the present invention needs to be formed as quickly as possible from when the automobile seat sheet member molded by the molding apparatus is taken out of the mold until warpage occurs. Therefore, it is preferable to cut with a cutter or the like at a preset location and depth after removal from the mold. A short time after the incision is made, a slit 4 which is recessed due to the shrinkage of the foam molded body 1 is formed. By forming the slits 4, the difference in shrinkage force between the individual portions of the foam molded body 1 is alleviated, and the warp generated in the foam molded body 1 is reduced. The slit 4 may be formed by cutting with a cutter in addition to the cutting by the cutter, or by previously forming a notch to be the slit 4 in the mold. Moreover, it is preferable that it is 0.1-20 mm, and, as for the width | variety of the slit 4 formed, it is more preferable that it is 0.2-10 mm.

  EXAMPLES Hereinafter, although the seat sheet member for automobiles of the present invention will be described in more detail with reference to examples, the present invention is not limited to these examples.

  In the molding apparatus shown in FIG. 2, foamed particles (polypropylene-based resin foamed particles: magnification: 30 times, foamed particle diameter: about 4 mm) are 1300 mm in length, 450 mm in width, 150 mm in thickness, and in the form of foam molded body shown in FIG. While filling the mold, a reinforcing member having the shape shown in FIG. 1 along the periphery of the foam molded body was inserted into the mold, and in-mold molding was performed by steam heating. In the heating method, steam was supplied for 5 seconds with the drain valves on both sides of the mold opened, and after preliminary heating (exhaust process), the molding vapor pressure (usually 0.3 MPa (G)) to 0.08 MPa ( G) One heating was performed at a low pressure, and one heating was performed in the opposite direction at a pressure 0.04 MPa (G) lower than the molding vapor pressure. Then, the main heating was performed from both sides at the molding vapor pressure. After the heating was completed, the pressure was released, air-cooled for 30 seconds, and water-cooled for 240 seconds to obtain a polypropylene resin foamed particle molded body. Next, slits having the depths shown in Table 1 were formed at the positions shown in FIGS. 1A to 1D using a cutter knife in the foamed molded product taken out from the mold. These foamed molded products were dried and cured in an atmosphere of 60 ° C. for 24 hours, and then foamed particle molded products having a length of 1300 mm, a width of 450 mm, and a thickness of 100 to 150 mm were obtained. The reinforcing member is embedded in the foamed molded body at a position of (B) mm shown in Table 1 from the lower surface. In addition, the thickness of the foamed molded product is formed so as to be inclined such that the front end is 150 mm and the rear end is 100 mm when used as an automobile seat.

  The warpage of the foamed molded articles of Examples 1 to 4 and Comparative Example 1 was measured and evaluated by the following method.

(Product end warp)
As shown in FIG. 7 (A), the seat surface side of the automobile seat member made of a foamed molded body (that is, the reinforcing member is embedded in the lower surface side) is placed on a plane, It fixed so that one edge part in the longitudinal direction (vehicle width direction of a motor vehicle) of the seat member for motor vehicles might become parallel to a plane. At this time, the end on the other side is lifted from the plane due to the warp. The length of the perpendicular from the bottom surface and the flat surface of the lifted end was measured to obtain the amount of warpage (mm) of the product end.

(Error from normal dimensions)
As shown in FIG. 7 (B), the seat surface of the automobile seat is placed on a flat surface, and one end in the longitudinal direction (vehicle width direction of the automobile) of the automobile seat is It fixed so that it might become parallel to a plane, and measured the length from one edge part to the other edge part. The difference between this length and the normal dimension was calculated and taken as an error from the normal dimension. These results are shown in Table 1.

  From Table 1, the Examples 1-4 which formed the slit have the difference from the curvature amount of a product edge part and a regular shaping | molding dimension compared with the comparative example 1 which does not form a slit, and the curvature of a foaming molding is reduced. It can be seen that the product value is excellent. In addition, when Examples 1 and 2 are compared, the amount of warping of the end of the product is greater in the foam molded body of Example 2 in which three slits are formed than in Example 1 in which one slit is formed. It can be seen that the error from the normal dimension is small.

  Separately, an automobile seat member was produced in the same manner as in Example 1 except that the slit was formed in the vertical direction at the position shown in FIG. 1A. At this time, the length (a) in the thickness direction from the bottom of the slit formed on the upper surface of the foamed molded body to the reinforcing member is 25 (mm), and the thickness in the thickness direction from the bottom of the slit formed on the lower surface to the reinforcing member is 25 mm. The length (c) was 15 (mm). Therefore, a−c = 10 mm. When the warpage of the product end portion and the normal dimension difference of this automobile seat sheet member were measured in the same manner as in Example 1, the warp of the product end portion was 5 mm, and the normal dimension difference was 2.3 mm. Therefore, it can be seen that the vehicle seat has less warping of the product and excellent dimensional accuracy.

  From these results, it was confirmed that the seat seat member for automobiles of the present invention is a seat member for automobiles that is lightweight, has little warpage, and has extremely excellent commercial value by forming slits under specific conditions. .

  The automotive seat sheet member of the present invention is attached to a vehicle body, and a soft synthetic resin foam such as urethane foam is laminated on the upper surface and side surfaces of the automotive seat sheet member. Furthermore, an automobile seat is formed by covering the outer peripheral surfaces such as the front surface, the side surface, and the upper portion of the laminate with a skin material such as woven or knitted fabric, vinyl leather, or leather.

  Soft synthetic resin foam is a resin foam that is made of soft foamed urethane that is mainly used as a material for seat cushions, or is made of a resin material that is different from soft foamed urethane with a high foaming rate. Means. By using the automobile seat sheet member of the present invention, the amount of the soft synthetic resin foam used can be reduced, and an automobile seat excellent in lightness can be formed.

1 Thermoplastic resin foam particle molding (foam molding)
2 Reinforcing member 4 Slit

Claims (6)

A reinforcing seat is embedded in a thermoplastic resin foam particle molded body, an automotive seat sheet member made of an integrally molded body,
At least one slit that is recessed in the thickness direction from the upper surface or the upper surface and the lower surface of the thermoplastic resin foam particle molded body is formed at a location where the reinforcing member is embedded so as to intersect the reinforcing member. An automobile seat seat member characterized by being provided. The slit is formed from the upper surface of the thermoplastic resin foam particle molded body, and the length (a) in the thickness direction from the bottom of the slit formed on the upper surface of the thermoplastic resin foam particle molded body to the reinforcing member (a) ( 2) and the length (b) (mm) in the thickness direction from the lower surface of the thermoplastic resin foamed particle molded body to the reinforcing member satisfies the following formula: Sheet member.
| A-b | ≦ 100 mm (1) The slit is formed from the upper surface and the lower surface of the thermoplastic resin foam particle molded body, and the length in the thickness direction from the bottom of the slit formed in the upper surface of the thermoplastic resin foam particle molded body to the reinforcing member (a ) (Mm), and the length (c) (mm) in the thickness direction from the bottom of the slit formed on the lower surface of the thermoplastic resin foam particle molded body to the reinforcing member satisfies the following formula (2): The vehicle seat seat member according to claim 1, wherein
| Ac | ≦ 100mm (2)   4. The slit according to claim 1, wherein the slit is formed at a position that equally divides the length in the longitudinal direction in a direction perpendicular to the longitudinal direction of the automobile seat member. 5. Seat member for automobiles.   The seat member for an automobile according to any one of claims 1 to 4, wherein the reinforcing member is a metal member. The automobile seat sheet member according to any one of claims 1 to 5, wherein the plastic resin foam particle molded body is a polypropylene resin foam particle molded body.

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