JP2019188973A - Manufacturing method of vehicle seat constitution member - Google Patents

Abstract

To provide a manufacturing method of a vehicle seat constitution member obtained by integrally foam-molding a skin and a seat pad, and having a main part and a side part different in hardness.SOLUTION: A manufacturing method of a seat back constitution member in which a back pad 30 is integrally foam-molded with a back cover 20. A standing wall member 25 is provided at a seam allowance part 23c of a main cover 21 and a side cover 22 on a reverse side face of the back cover 20. The manufacturing method has: a first process in which a front side face of the back cover 20 is so located on a cavity surface of a lower die 51 as to be brought into contact with the cavity surface; a second process in which a main part padding raw material 31R is injected onto a reverse side face of the main cover 21, and a side padding raw material 32R, which can form a compact which has a hardness higher than that of a compact of the main part padding raw material 31R, is injected onto a reverse side face of the side cover 22; a third process in which an upper die 52 is closed, thereby making foam curing; and a fourth process in which the seat back constitution member is removed from the dies.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a method for manufacturing a vehicle seat component. Specifically, the present invention relates to a method for manufacturing a vehicle seat constituent member in which an outer skin and a seat pad are integrated by integral foam molding.

  2. Description of the Related Art Conventionally, a vehicle seat constituent member is known in which a skin and a seat pad are integrally formed by integral foam molding. In the vehicle seat constituent member described in Patent Document 1, a seat pad that is a cushion material having the same hardness is provided in the main portion that is the center portion of the seat surface portion of the seat pad and the side portions that are the left and right side portions of the seat surface portion. It is used and integrated with a sheet cover, which is a skin material, by surface foaming by integral foam molding.

JP2013-216196A

  In a vehicle seat constituent member of the type in which a seat pad is foam-molded and a seat cover is placed thereon, the hardness of the main portion and the side portion of the seat pad can be easily varied. Specifically, in the foam molding die of the seat pad, the standing resin is provided at the boundary between the portion corresponding to the main portion and the portion corresponding to the side portion, and the foamed resin raw material to be charged into the main portion and the foamed resin raw material to be charged into the side portion are Manufacture by making different. As a result, when the vehicle seat component is attached to the seat frame to form a vehicle seat, the main portion softly supports the seated occupant's body, and the side portion tilts the seated occupant's body side when the vehicle turns, etc. It can be supported as hard as possible. On the other hand, in the vehicle seat constituent member disclosed in Patent Document 1, the foamed resin material is injected onto the back surface of the seat cover placed on the cavity surface of the lower mold and foam-molded. At this time, the seat cover is formed in a planar shape by connecting the main part and the side part, and there is no standing wall separating the main part and the side part. It was difficult to mold the main part and the side part to different hardness because they were mixed in the molding stage. Therefore, in a vehicle seat constituent member in which the skin and the seat pad are integrally formed by integral foam molding, it is desired to provide a method for manufacturing a vehicle seat constituent member in which the hardness of the main portion and the side portion is different. It was.

  In view of such a problem, an object of the present invention is to provide a vehicle in which the hardness of the main part and the side part is changed in the method of manufacturing a vehicle seat component in which the skin and the seat pad are integrally formed by integral foam molding. It is providing the manufacturing method of the sheet | seat structural member.

  1st invention of this invention is a manufacturing method of the sheet | seat structural member for vehicles by which the seat pad which is a cushion material is integrated with the sheet | seat cover which is a skin material in the state joined by planar foam molding in planar shape. The vehicle seat constituent member includes a main portion and side portions that bulge to the surface side on both side portions of the main portion, and the main portion on the seat pad side surface of the seat cover. A standing wall member extending toward the seat pad is disposed on the boundary line between the side portion and the side portion, and the seat cover is disposed on the cavity surface of the lower mold with the front surface abutting thereon. A first step of injecting a first foamed resin material into the main portion side of the standing wall member of the seat cover and the first foamed resin material on the side portion side of the standing wall member of the seat cover; A second step of injecting a second foamed resin raw material capable of forming a molded body having a hardness higher than that of the shape; and closing the upper mold with respect to the lower mold and the first foamed resin raw material and the second foamed resin A third step of foaming and curing a raw material to form the seat pad; and a fourth step of demolding the vehicle seat component in which the seat cover and the seat pad are integrated. To do.

  According to the first invention, the first foamed resin raw material injected into the portion corresponding to the main portion of the back side surface of the seat cover and the first injected into the portion corresponding to the side portion of the back side surface of the seat cover. The two foamed resin raw materials are foam-cured in the cavity in a state where they are separated by the standing wall member. Thus, in the vehicle seat component member in which the seat pad is integrated with the seat cover in a state of being joined in a planar shape by integral foam molding, the vehicle seat in which the hardness of the side portion is higher than the main portion A component can be manufactured.

  According to a second aspect of the present invention, in the first aspect, the boundary line of the seat cover includes a piece corresponding to the main portion and a piece corresponding to the side portion that are sewn with a seam margin at the end. The standing wall member is formed by a wire, and is arranged and stitched on either the first foamed resin raw material or the second foamed resin raw material with respect to the seam allowance portion. It is characterized by.

  According to the second invention, one of the first foamed resin raw material and the second foamed resin raw material that is injected first foams and expands faster than the other, and comes into contact with the standing wall member to place the standing wall member on the other side. Press to. At this time, the standing wall member is sewn in a state in which the surface in the pressed direction is in contact with the seam allowance, so that the standing wall member is supported by the seam allowance and hardly falls down. As a result, the first foamed resin raw material and the second foamed resin raw material are prevented from being mixed and foam-cured, and it is easy to manufacture a vehicle seat component having a higher side part hardness than the main part. can do.

  According to a third aspect of the present invention, in the above second aspect, the standing wall member is stitched to the seam margin at at least two locations on the side closer to the surface of the seat cover and on the far side. And

  According to the third aspect of the invention, the standing wall member is sewn at least two places near and far from the surface of the seat cover with respect to the seam allowance portion, so that the standing wall member is less likely to fall down during foam molding of the seat pad. Accordingly, it is possible to easily manufacture a vehicle seat constituent member in which the hardness of the side portion is higher than that of the main portion.

  According to a fourth invention of the present invention, in any one of the first to third inventions, the standing wall member is formed by folding a planar body obtained by laminating a slab pad on a fabric and stitching the end portions together. It is formed.

  According to the fourth aspect of the invention, the standing wall member is formed of a planar body obtained by laminating a slab pad on a cloth, so that it is difficult for the seated occupant to feel a foreign object feeling even if the standing wall member is disposed inside the seat pad.

  According to a fifth aspect of the present invention, in any one of the first to third aspects, the standing wall member is formed of a flexible synthetic resin plate member.

  According to the fifth aspect, since the standing wall member is formed of a flexible synthetic resin plate-like member, the standing wall member can be more unlikely to fall down during foam molding of the seat pad.

It is the perspective view which looked at the sheet | seat for motor vehicles provided with the sheet | seat structural member manufactured by the manufacturing method of one Embodiment of this invention from diagonally forward. It is the front view which looked at the seat back provided with the seat constituent member manufactured by the manufacturing method of the above-mentioned embodiment from the front. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. It is a figure which expands and shows the IV part in FIG. In the manufacturing method of the said embodiment, it is sectional drawing which shows typically the state (1st process) which set the back cover to the lower mold | type. In the manufacturing method of the said embodiment, it is sectional drawing which shows typically the state (2nd process) inject | pouring the urethane foam raw material in the state which set the back cover to the lower mold | type. In the manufacturing method of the said embodiment, it is sectional drawing which shows typically the state (3rd process) which closed the upper mold | type with respect to a lower mold | type, and is making the urethane foam raw material foam-harden. It is sectional drawing corresponding to FIG. 3 of the sheet | seat structural member manufactured by the manufacturing method of other embodiment of this invention. It is a figure which expands and shows the IX part in FIG.

  1 to 4 show an automobile seat 1 and a seat back 3 including a seat back constituent member 10 manufactured by a method for manufacturing a vehicle seat constituent member according to an embodiment of the present invention. In each figure, each direction of the automobile and the automobile seat 1 when the automobile seat 1 is attached to the automobile is shown by arrows. In the following description, the description regarding the direction is made based on this direction. Here, the seat back constituent member 10 corresponds to a “vehicle seat constituent member” in the claims.

  As shown in FIG. 1, the automobile seat 1 includes a seat cushion 2 that serves as a seating portion, a seat back 3 that serves as a backrest, and a headrest 4 that supports the head. The rear end portion of the seat cushion 2 and the lower end portion of the seat back 3 are connected via a recliner (not shown) so that the inclination angle of the seat back 3 with respect to the seat cushion 2 can be adjusted. The seat back 3 includes a back frame 5 that forms a skeleton, and a seat back constituting member 10 that is placed on the back frame 5. The back frame 5 is formed in a substantially U shape in which the upper pipes 5b are connected between upper ends of a pair of side frames 5a arranged to extend in the vertical direction on the left and right sides of the seat back 3, and the lower part is opened in a front view. Yes. Lower ends of the pair of side frames 5a are connected to rear end portions of a cushion frame (not shown) of the seat cushion 2 via a recliner (not shown).

  As shown in FIGS. 1 to 4, the seat back component 10 is formed in a state in which a back cover 20 that is a skin material and a back pad 30 that is a cushion material are joined to each other by integral foam molding. . The seat back component 10 includes a main part 11 that contacts and supports the rear surface of the back of the seated occupant, a side part 12 that contacts and supports the side surface of the back of the seated occupant on both the left and right sides of the main part 11, Have The front surface side that is the front surface side of the main portion 11 is formed as a substantially flat surface, and the front surface side that is the front surface side of the side portion 12 is formed so as to bulge forward from the main portion 11. Here, the back cover 20 and the back pad 30 correspond to “seat cover” and “seat pad” in the claims, respectively.

  As shown in FIGS. 1 to 4, the back cover 20 is a planar member in which a cover pad 20 b made of urethane foam slab is integrally laminated on a skin 20 a such as a fabric on the surface layer side that is a seating surface side. A plurality of pieces are cut along the outer shape of the seat back 3 and integrated by sewing. Specifically, a side cover 22, which is a piece corresponding to the side portion 12, is sewn with a vertical sewing line 23 at both left and right ends of the main cover 21 that is a piece corresponding to the main portion 11. It has become. A horizontal sewing line 24 as a design line is disposed between the left and right vertical sewing lines 23 in a substantially central portion in the vertical direction of the main cover 21. The left and right vertical sewing lines 23 include a front front vertical sewing line 23a and a rear rear vertical sewing line 23b extending in parallel with each other in the vertical direction. The terminal portions of the main cover 21 and the side cover 22 provided with the front vertical sewing line 23a and the rear vertical sewing line 23b are sewing margin portions 23c. The two sewing lines, the front vertical sewing line 23a and the rear vertical sewing line 23b, are provided to prevent the standing wall member 25 from falling over when the back pad 30 is foam-molded. The standing wall member 25 is a band-like planar member in which a cover pad 25b made of urethane foam slab is integrally laminated on an outer skin 25a such as a fabric, etc., with a fold line extending in the longitudinal direction so that the side of the outer skin 25a is inside. It is formed by folding. The main cover 21 and the side cover 22 are integrated by bringing the end opposite to the folding line into contact with the main cover 21 side and sewing with the vertical sewing line 23. The epidermis 25a may be the same as or different from the epidermis 20a. The cover pad 25b may be the same as or different from the cover pad 20b. If the skin 25a is the same as the skin 20a and the cover pad 25b is the same as the cover pad 20b, the same planar member as the back cover 20 can be used for convenience. Here, the front vertical sewing line 23a corresponds to “sewing line, boundary line” in the claims.

  As shown in FIGS. 2 to 4, the back pad 30 is a cushion body made of a soft polyurethane foam. In the back pad 30, side pad portions 32 corresponding to the side portions 12 are formed integrally with the left and right end portions of the main pad portion 31 corresponding to the main portion 11. The front surface side that is the front surface side of the main pad portion 31 is connected in such a manner that a part of the front surface side penetrates the rear surface side that is the rear surface side of the cover pad 20 b of the main cover 21. The front surface side and the left and right side surfaces, which are the front surface side, of the side pad portion 32 are connected in such a manner that a part thereof enters the back surface side and the left and right side surfaces that are the rear surface side of the cover pad 20 b of the side cover 22. Both left and right end portions of the main pad portion 31 are connected to the left and right side pad portions 32 via a standing wall member 25 to form a back pad 30. The standing wall member 25 is substantially perpendicular to the main cover 21, and is connected to the cover pad 25 b of the standing wall member 25 in such a manner that a part of the main pad portion 31 or the side pad portion 32 enters. The rear surface side, which is the rear surface side of the main pad portion 31, is formed as a substantially flat surface, and the rear surface side, which is the rear surface side of the side pad portion 32, is formed as a concave portion 32a that protrudes forward. . The side pad portion 32 is formed with a higher hardness than the main pad portion 31.

  As shown in FIG. 3, when the seat back constituting member 10 is put on the back frame 5, the left and right side frames 5 a are respectively disposed in the left and right recesses 32 a. A seat back cover 13 is disposed between the rear end portions of the left and right side portions 12 of the seat back constituting member 10 so as to form the seat back 3.

  Next, the manufacturing method of the seat back structural member 10 which comprises the said seat back 3 is demonstrated. As shown in FIGS. 5-7, the shaping | molding die 50 is comprised from the lower mold | type 51 and the upper mold | type 52, and the cavity 53 is formed in the overlapped inside. Here, the display of the direction in FIGS. 5-7 shall match the direction of the seat back structural member 10. Therefore, the front and rear in FIGS. 5 to 7 correspond to the lower upper portion in the claims. The space shape of the cavity 53 is a shape that roughly corresponds to the shape of the seat back component 10. That is, the space shape of the cavity 53 is a shape corresponding to the shape of the back pad 30 in which the back cover 20 is joined to the back pad 30 in a planar shape. The cavity 53 shown in FIG. 7 has a space shape in which the rear surface side of the lower mold 51 is the seating surface side of the seatback component 10 and the front surface side of the upper mold 52 is the surface opposite to the seating surface of the seatback component 10. It has become. In the mold 50, both the lower mold 51 and the upper mold 52 are made of aluminum.

  First, in the first step shown in FIG. 5, the back cover 20 is set on the surface of the cavity 53 of the lower mold 51. Specifically, the back cover 20 is set with respect to the lower mold 51 so that the skin 20 a contacts the surface of the cavity 53 corresponding to the main portion 11 and the side portion 12 of the seat back constituting member 10. At this time, a locking member such as a magic tape (registered trademark) or a double-sided tape may be used as necessary so that the skin 20a contacts the inner surface of the cavity 53 over the entire area. In this state, the standing wall member 25 attached to the main cover 21 and the side cover 22 with the vertical sewing line 23 extends rearward substantially perpendicularly to the back surface side of the main cover 21.

  Next, in the second step shown in FIG. 6, urethane foam material is injected onto the cover pad 20 b of the back cover 20 in a state where the back cover 20 is set on the lower mold 51. Specifically, first, a main part pad raw material 31 </ b> R which is foamed and cured to become the main pad part 31 is injected onto the cover pad 20 b of the main cover 21. Next, a side portion pad raw material 32 </ b> R that is foam-cured and becomes the side pad portion 32 is injected onto the cover pad 20 b of the side cover 22. The pad formed by foaming and curing the main part pad raw material 31R is softer than the pad formed by foaming and curing the side part pad raw material 32R. Here, the main part pad raw material 31R and the side part pad raw material 32R respectively correspond to the “first foamed resin raw material” and the “second foamed resin raw material” in the claims.

  Then, in the third step shown in FIG. 7, the upper die 52 is closed with respect to the lower die 51, and the main portion pad raw material 31R and the side portion pad raw material 32R are foamed and cured. The upper mold 52 is engaged with the lower mold 51, and the foaming gas generated in the process of foaming and curing the urethane foam material is discharged out of the cavity 53 through the contact surface between the lower mold 51 and the upper mold 52. The At this time, since the main portion pad raw material 31R is injected into the cavity 53 prior to the side portion pad raw material 32R, the main portion pad raw material 31R first reaches the inner surface of the standing wall member 25 and presses the standing wall member 25 toward the seat outer direction. . However, since the standing wall member 25 has its front end portion (the lower mold 51 side) end portion supported by the seam allowance 23c from the seat outer side, the standing wall member 25 is prevented from falling in the seat outer direction. The standing wall member 25 is substantially perpendicular to the back side of the main cover 21 by being pressed toward the seat inner side by the side portion pad raw material 32R that has reached the seat outer surface of the standing wall member 25 with a delay. Thus, the main portion pad raw material 31R and the side portion pad raw material 32R are foam-cured and integrated. Accordingly, the main pad material 31R and the side pad material 32R are prevented from being mixed and foam-cured and the main pad portion 31 and the side pad portion 32 having different hardness are formed. At the same time, the main pad raw material 31R and part of the side pad raw material 32R penetrate into the cavity 53 side surface of the cover pad 20b and solidify, and the back cover 20 and the back pad 30 are joined together in a planar shape. . The mold 50 may be heated as necessary while the main portion pad raw material 31R and the side portion pad raw material 32R are foam-cured. Finally, in the fourth step, the seat back component 10 formed by opening the upper mold 52 from the state shown in FIG. 7 is removed.

  The above-described embodiment configured as described above has the following operational effects. With the back cover 20 set on the lower mold 51, the main part pad raw material 31R injected onto the cover pad 20b of the main cover 21 and the side part pad injected onto the cover pad 20b of the side cover 22 The raw material 32 </ b> R is foam-cured in the cavity 53 in a state where the raw material 32 </ b> R is separated by the standing wall member 25. As a result, in the seat back constituting member 10 in which the back pad 30 is integrated with the back cover 20 in a state of being joined in a planar shape by integral foam molding, the hardness of the side portion 12 is higher than that of the main portion 11. The seat back constituent member 10 can be manufactured.

  The standing wall member 25 is sewn to the main cover 21 and the side cover 22 on the main cover 21 side by a front vertical sewing line 23a and a rear vertical sewing line 23b. Then, the main portion pad raw material 31R is injected into the main cover 21 side before the side portion pad raw material 32R is poured into the side cover 22 side. As a result, the main portion pad raw material 31R expands and expands faster than the side portion pad raw material 32R, abuts against the standing wall member 25, and presses the standing wall member 25 toward the side cover 22. At this time, since the standing wall member 25 is sewn on the side of the pressing direction with respect to the seam allowance 23c, the standing wall member 25 is supported by the seam allowance 23c and hardly falls down. As a result, the main portion pad raw material 31R and the side portion pad raw material 32R are prevented from being mixed and foam-cured, and it is easy to manufacture the seat back component 10 in which the hardness of the side portion 12 is higher than the main portion 11. can do.

  Further, the standing wall member 25 is formed by folding a belt-like planar member in which the cover pad 25b is integrally laminated with the skin 25a into two with a fold line extending in the longitudinal direction so that the side of the skin 25a is inside. It is. Thereby, even if the standing wall member 25 is disposed inside the back pad 30 and the seat back constituting member 10 is formed, it is difficult for the seated occupant to feel a foreign object.

  8 and 9 show a seat back 3A including a seat back constituent member 10A manufactured by a method for manufacturing a vehicle seat constituent member according to another embodiment of the present invention. The structure common to the seat back constituent member 10 manufactured by the method for manufacturing a vehicle seat constituent member according to the above-described embodiment will be denoted by the corresponding reference numerals, and detailed description thereof will be omitted. The difference between the seat back constituent member 10 </ b> A and the seat back constituent member 10 is that the standing wall member 25 </ b> A is different from the standing wall member 25. The standing wall member 25A is formed of a flexible plate material such as a polypropylene resin plate. The standing wall member 25 </ b> A is integrated with the main cover 21 and the side cover 22 by bringing the front side (front side) end part into contact with the main cover 21 side of the seam allowance 23 c and sewing with the vertical sewing line 23. Here, the seat back constituent member 10 </ b> A corresponds to a “vehicle seat constituent member” in the claims.

  About the manufacturing method of 10 A of seat back structural members which comprise the said seat back 3A, it is the same as the manufacturing method of the seat back structural member 10 only by replacing the standing wall member 25 with the standing wall member 25A. The operational effects of the other embodiment are the same as the operational effects of the embodiment in that the seated occupant is less likely to feel a foreign object due to the standing wall member 25A being disposed inside the back pad 30. Although it is inferior, it is superior to one embodiment in that the standing wall member 25 </ b> A can be made more difficult to fall during foaming of the back pad 30. This is because the standing wall member 25 </ b> A is formed of a flexible synthetic resin plate-like member, and therefore the standing wall member 25 </ b> A has higher rigidity than the standing wall member 25.

  As mentioned above, although specific embodiment was described, this invention is not limited to those external appearances and structures, A various change, addition, and deletion are possible in the range which does not change the summary of this invention. For example, the following can be mentioned.

  1. In the above-described embodiment, the standing wall member 25 or the standing wall member 25A is attached to the sewing margin 23c by sewing the main cover 21 and the side cover 22 as separate pieces along the vertical sewing line 23. However, the present invention is not limited to this, and the standing wall member 25 or the standing wall member 25A may be attached with the vertical sewing line 23 as one sewing line, or the standing wall member 25 or the standing wall member 25A by means such as adhesion or welding to the sewing margin 23c. May be attached. Furthermore, the main cover 21 and the side cover 22 may be integrated, and the standing wall member 25 or the standing wall member 25A may be attached to the boundary line between the main portion 11 and the side portion 12 by means such as sewing, bonding, or welding.

  2. In the said embodiment, although this invention was applied to the seat back structural member 10 of the seat back 3, or the seat back structural member 10A, you may apply this invention not only to this but to a seat cushion.

  3. In the above embodiment, the standing wall member 25 or the standing wall member 25 </ b> A is attached to the back cover 20. However, the present invention is not limited to this, and the standing wall member may be made of other materials as long as it has predetermined flexibility and rigidity. For example, a thick nonwoven fabric or paper can be used.

  4). In the above embodiment, the present invention is applied to a seat for an automobile. However, the present invention can also be applied to a seat for a railway vehicle, an airplane, a ship and the like.

DESCRIPTION OF SYMBOLS 1 Automotive seat 3 Seat back 3A Seat back 10 Seat back structural member (vehicle seat structural member)
10A Seat back component (vehicle seat component)
11 Main part 12 Side part 20 Back cover (seat cover)
21 Main cover 22 Side cover 23c Seam allowance 23a Front vertical sewing line (sewing line, boundary line)
23b Rear vertical sewing line 25 Standing wall member 25A Standing wall member 25a Skin 30 Back pad (seat pad)
31 Main pad part 31R Main part pad raw material (first foamed resin raw material)
32 Side pad portion 32R Side portion pad raw material (first foamed resin raw material)
50 Mold 51 Lower mold 52 Upper mold 53 Cavity

Claims (5)

It is a method for manufacturing a vehicle seat constituent member that is integrated in a state where a seat pad that is a cushioning material is joined in a planar shape by integral foam molding to a seat cover that is a skin material,
The vehicle seat component includes a main part, and side parts that bulge to the surface side at both side parts of the main part,
On the seat pad side surface of the seat cover, a standing wall member extending to the seat pad side is disposed on a boundary line between the main portion and the side portion,
A first step of placing the seat cover in contact with the front surface on the cavity surface of the lower mold;
The first foamed resin material is injected into the main portion side of the standing wall member of the seat cover, and the hardness of the molded body of the first foamed resin material on the side portion side of the standing wall member of the seat cover. A second step of injecting a second foamed resin raw material capable of forming a high molded article,
A third step of closing the upper mold with respect to the lower mold and foam-curing the first foamed resin material and the second foamed resin material to form the seat pad;
A fourth step of demolding the vehicle seat component in which the seat cover and the seat pad are integrated;
The manufacturing method of the sheet | seat structural member for vehicles which has this. In Claim 1, the boundary line of the seat cover is formed by a sewing line in which a piece corresponding to the main portion and a piece corresponding to the side portion are sewn with a sewing margin portion at an end portion,
The standing wall member is a vehicle seat constituent member that is arranged and stitched on either the first foamed resin raw material or the second foamed resin raw material with respect to the seam allowance. Production method.   3. The method of manufacturing a vehicle seat constituent member according to claim 2, wherein the standing wall member is stitched to at least two locations on the side near and far from the surface of the seat cover with respect to the seam allowance. A method for manufacturing a vehicle seat component according to any one of claims 1 to 3,
The said standing wall member is a manufacturing method of the vehicle sheet | seat structural member formed by folding the planar body which laminated | stacked the slab pad on the fabric in two, and stitch | sutures edge parts. A method for manufacturing a vehicle seat component according to any one of claims 1 to 3,
The said standing wall member is a manufacturing method of the sheet | seat structural member for vehicles currently formed of the plate-shaped member of a flexible synthetic resin.

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