Seat cushion and method for manufacturing a seat cushion

Abstract

The seat cushion includes a cushion pad (1). The cushion pad (1) includes a soft foam (2) and a bead method foam (3) embedded in the soft foam (2). A lower surface of the cushion pad (1) is formed by a lower surface (2f2) of the soft foam (2).

Description

Technical Field

[0001] This invention relates to a seat cushion and a method for manufacturing a seat cushion. Background Technology

[0002] In conventional seat cushions, there exist cushions in which the main body is formed of a soft foam, and a portion of the lower surface of the soft foam is covered by a bead-formed foam, thereby improving the support stability of the cushion (see, for example, Patent Document 1). In contrast, other conventional seat cushions exist in which through-holes are formed in the bead-formed foam, and a portion of the lower surface of the bead-formed foam is covered by a soft foam formed using soft foam material supplied through these through-holes (see, for example, Patent Document 2).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2010-259535

[0006] Patent Document 2: Japanese Patent Application Publication No. 2018-134360 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] The aforementioned previous seat cushions all achieved this by making the lower surface of the soft foam and the lower surface of the bead-based foam horizontally aligned, thus creating a smooth surface formed by the lower surfaces of the soft foam and the bead-based foam.

[0009] However, bead-blown foam is more susceptible to heat than soft foam. Therefore, there is room for improvement in the heat resistance of the aforementioned conventional seat cushions.

[0010] The object of the present invention is to provide a seat cushion with excellent heat resistance and a method for manufacturing the seat cushion for easy acquisition of the seat cushion.

[0011] Solution for solving the problem

[0012] The seat cushion of the present invention includes a cushioning pad, wherein the cushioning pad comprises a soft foam and a bead-blown foam embedded in the soft foam, and the lower surface of the cushioning pad is formed by the lower surface of the soft foam. The seat cushion of the present invention has excellent heat resistance.

[0013] Preferably, the seat cushion of the present invention comprises an upper soft foam covering the upper surface of the bead-formed foam and a lower soft foam covering the lower surface of the bead-formed foam. In this case, since the sitting side is covered by the soft foam, it provides excellent heat resistance while improving seating comfort.

[0014] Preferably, in the seat cushion of the present invention, the bead-formed foam has a through-hole extending in the vertical direction, and the upper soft foam and the lower soft foam are connected through the through-hole formed in the bead-formed foam. In this case, the seat cushion of the present invention becomes a seat cushion with excellent heat resistance and easy to manufacture.

[0015] Preferably, the seat cushion of the present invention is a seat cushion for rear seats. The seat cushion of the present invention is particularly effective as a seat cushion for rear seats.

[0016] Preferably, in the seat cushion of the present invention, the bead-formed foam has two under-buttock openings, and the through-hole is disposed between the two under-buttock openings. In this case, the seat cushion of the present invention becomes a rear seat cushion with excellent heat resistance and easy manufacturing.

[0017] Preferably, in the seat cushion of the present invention, the soft foam is composed of soft foamed polyurethane, and the bead-blown foam is composed of bead-blown polypropylene or bead-blown polystyrene. In this case, by using commonly used soft foam and bead-blown foam, a cost-effective seat cushion is achieved.

[0018] The present invention provides a method for manufacturing a seat cushion using a molding die with an vent and a bead-type foam body having through holes to obtain a seat cushion in which the outer surface of the bead-type foam body with the through holes is covered by a soft foam body. The method includes: a bead-type foam body placement step, in which the bead-type foam body is placed inside the molding die such that a gap is formed between the molding die and the bead-type foam body and the through holes of the bead-type foam body are positioned offset relative to the vent; and a foam material supply step, after the bead-type foam body placement step, in which soft foam material is supplied to the interior of the molding die through the through holes of the bead-type foam body toward the gap. According to the method for manufacturing a seat cushion of the present invention, a seat cushion with excellent heat resistance can be easily obtained.

[0019] The preferred method for manufacturing the seat cushion of the present invention is to use a molding die in which a gap is formed between the molding die and the bead-formed foam when the bead-formed foam is disposed inside the molding die, and the through holes of the bead-formed foam are disposed at a position offset relative to the venting portion. In this case, a seat cushion with excellent heat resistance can be obtained more easily.

[0020] The preferred method for manufacturing the seat cushion of the present invention is to use a bead-formed foam having two under-buttock openings, with the through-hole disposed between the two under-buttock openings. In this case, a seat cushion for rear seats with excellent heat resistance can be easily obtained.

[0021] The effects of the invention

[0022] According to the present invention, a seat cushion with excellent heat resistance and a method for manufacturing the seat cushion for easy acquisition are provided. Attached Figure Description

[0023] Figure 1 This is a top view schematically illustrating a seat cushion according to one embodiment of the present invention.

[0024] Figure 2 It is a general representation Figure 1 A bottom view of the seat cushion.

[0025] Figure 3 It is a general representation Figure 1 Side view of the seat cushion.

[0026] Figure 4 It is a general representation Figure 1 Rear view of the seat cushion.

[0027] Figure 5 Represented by X-X cross section Figure 1 A cross-sectional view of the seat cushion.

[0028] Figure 6 Represented by Y-Y cross section Figure 1 A cross-sectional view of the seat cushion.

[0029] Figure 7 It is roughly represented from the top side. Figure 1 A 3D diagram of the seat cushion.

[0030] Figure 8 It is roughly represented from the bottom side. Figure 1 A 3D diagram of the seat cushion.

[0031] Figure 9 It is a general representation Figure 1 A top view of an example of the beaded foam contained in the seat cushion.

[0032] Figure 10 It is a general representation Figure 9 A top view of a bead-blown foam.

[0033] Figure 11 Represented by Z-Z section Figure 9 A cross-sectional view of a bead-based foam.

[0034] Figure 12 It is roughly represented from the top side. Figure 9 A three-dimensional diagram of a bead-based foam.

[0035] Figure 13 It is roughly represented from the bottom side. Figure 9 A three-dimensional diagram of a bead-based foam.

[0036] Figure 14 This is a diagram illustrating, in a general sense, a method for manufacturing a seat cushion according to one embodiment of the present invention. Detailed Implementation

[0037] Hereinafter, a method for manufacturing a seat cushion according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0038] (seat cushion)

[0039] The seat cushion 1 of one embodiment of the present invention is a vehicle seat cushion used in a vehicle seat (car seat). Furthermore, in the following description, "upper," "lower," "left," "right," "front," and "rear" refer to the direction viewed from the perspective of a person sitting in the seat. Furthermore, in the following description, "left-right direction" also refers to the "width direction." Furthermore, in this embodiment, "lower surface" and "bottom surface" are synonymous. Also, in this embodiment, "rear surface" and "back side" are synonymous.

[0040] Figure 1 This is a top view that roughly shows the seat cushion 1 from above. Figure 2 This is a bottom view that roughly shows the seat cushion 1 from below. Figure 3 This is a simplified side view of the left side of seat cushion 1. Figure 4 This is a rough rear view showing the rear side of seat cushion 1. Figure 5 It is Figure 1 The X-X section represents the sectional view of seat cushion 1.

[0041] Seat cushion 1 is a seat cushion that includes a cushioning pad (a pad located under the buttocks of the seated person). See reference. Figures 1-4 In this embodiment, the seat cushion 1 is a cushioning pad. (Refer to...) Figure 5The seat cushion 1 comprises a soft foam body 2 and bead-formed foam body 3 embedded in the soft foam body 2. The lower surface of the seat cushion 1 (reference numeral 1f2) is formed by the lower surface 2f2 of the soft foam body 2. Here, for example, refer to... Figure 2 In the top view, the lower surface of the seat cushion 1 is the surface that connects the lowest points at any position in the front-back, left-right, and right directions of the seat cushion 1. Specifically, the entire surface of the lower surface 3f2 of the bead-type foam 3 is located above the lower surface 2f2 of the soft foam 2.

[0042] In this embodiment, the soft foam 2 includes an upper soft foam 21 on the upper surface 3f1 of the bead-coated foam 3 and a lower soft foam 22 on the lower surface 3f2 of the bead-coated foam 3.

[0043] Figure 6 It is Figure 1 The Y-Y section represents the sectional view of seat cushion 1.

[0044] Reference Figure 6 In this embodiment, the bead-formed foam 3 has a through hole 31 extending in the vertical direction. The upper soft foam 21 and the lower soft foam 22 are connected through the through hole 31 formed in the bead-formed foam 3.

[0045] In this embodiment, the upper flexible foam 21 and the lower flexible foam 22 are connected by a connecting portion 23 through the through hole 31. In this embodiment, the connecting portion 23, together with the upper flexible foam 21 and the lower flexible foam 22, is formed of flexible foam material filling the through hole 31.

[0046] In this embodiment, seat cushion 1 is a seat cushion for the rear seat.

[0047] For example, refer to Figure 1In this embodiment, the seat cushion 1 is a rear seat cushion formed by integrating the left and right seats. In this embodiment, the seat cushion 1 has two main cushion portions 211. The main cushion portions 211 are configured to support the buttocks and thighs of the occupant from below. Furthermore, in this embodiment, the seat cushion 1 has a pair of side cushion portions 212 located to the left and right of the two main cushion portions 211, configured to rise upwards from the main cushion portions 211 and support the occupant from both sides. In this embodiment, the seat cushion 1 also has a middle cushion portion 213 disposed between the two main cushion portions 211. Additionally, in this embodiment, the seat cushion 1 has a mounting portion 214 for mounting the seat cushion 1 to a vehicle. Furthermore, in this embodiment, the main cushion portion 211 is composed of a lower leg portion 211a and a lower buttock portion 211b. The lower leg portion 211a is configured to support the thigh of the seated person from below, and the lower buttock portion 211b is located at a position further back than the lower leg portion 211a, and is configured to support the buttock of the seated person from below.

[0048] In this embodiment, such as Figure 1 As shown, the upper outer portion (upper surface) of the seat cushion 1 is formed of upper soft foam 21. Furthermore, as... Figure 2 As shown, the lower outer portion (lower surface) of the seat cushion 1 is formed of a lower soft foam body 22. Additionally, reference numeral A1 indicates a vehicle mounting through-hole for mounting the seat cushion 1 to the vehicle. Furthermore, reference numeral A2 indicates a seatbelt mounting notch for mounting the seatbelt. Also, refer to... Figure 3 In this embodiment, the outer side portion of the seat cushion 1 is formed by an upper soft foam 21 and a lower soft foam 22. Furthermore, referring to… Figure 4 In this embodiment, the rear outer portion of the seat cushion 1 is formed by an upper soft foam 21 and a lower soft foam 22.

[0049] Figure 7 Seat cushion 1 is roughly shown from above. Furthermore, Figure 8 The seat cushion is shown in a simplified view from below. As shown in the perspective view above, in this embodiment, the outer surface of the seat cushion 1 is formed by an upper soft foam 21 and a lower soft foam 22. In this embodiment, the bead-type foam 3 can be completely embedded inside the soft foam 2. In this case, in this embodiment, there is no portion on the lower surface 1f2 of the seat cushion 1 that exposes the lower surface 3f2 of the bead-type foam 3.

[0050] Figure 9 An example of the bead-blown foam 3 included in the seat cushion 1 is shown from above. Furthermore, Figure 10 Roughly represented from the bottom Figure 9 3. Bead-based foaming process. In addition... Figure 11 use Figure 9 Z-Z section representation Figure 9 3. Bead-based foaming process. In addition... Figure 12 Roughly represented from the top Figure 9 3. Bead-based foaming. Furthermore, Figure 13 Roughly represented from the bottom Figure 9 3. Bead-based foaming material.

[0051] The bead-formed foam 3 has two underside openings 32. The two underside openings 32 are arranged at intervals in the left-right direction (width direction). In addition, a through hole 31 formed in the bead-formed foam 3 is disposed between the two underside openings 32.

[0052] In this embodiment, the bead-blown foam 3 constitutes the core (cushion body) of the seat cushion 1. (Refer to...) Figure 12 and Figure 13 The bead-formed foam 3 is a flat sheet. Furthermore, in this embodiment, the bead-formed foam 3 has a through-hole A1 for vehicle mounting and a seatbelt mounting notch A2.

[0053] In this embodiment, the lower buttock opening 32 is a through hole. The lower buttock opening 32 penetrates the bead-formed foam 3 in the vertical direction. In this embodiment, the aperture (opening area) of the lower buttock opening 32 is larger than the aperture (opening area) of the through hole 31. However, the lower buttock opening 32 can be designed as a non-through recess.

[0054] The through-hole 31 also penetrates the bead-based foam 3 in the vertical direction. In this embodiment, as... Figure 9 and Figure 10 As shown, the through hole 31 is a circular hole. However, the through hole 31 can be made into various shapes, such as a polygonal hole like a square hole, a slit hole like an elliptical hole, etc. Furthermore, the size (e.g., diameter) of the through hole 31 can be appropriately set.

[0055] Furthermore, in this embodiment, a plurality of through holes 31 are formed in the bead-blown foam 3. In this embodiment, the plurality of through holes 31 are arranged in multiple rows along both the front-back and left-right directions. Specifically, four through holes 31 are arranged in two rows each along both the front-back and left-right directions. In this embodiment, three through holes 31 are arranged between the two lower hip openings 32. Furthermore, in this embodiment, one through hole 31 is arranged between the vehicle mounting through hole A1 and the seatbelt mounting notch A2. However, the arrangement of the plurality of through holes 31 can be appropriately set. Furthermore, the interval between the plurality of through holes 31 can also be appropriately set. And, at least one through hole 31 can be provided.

[0056] For example, refer to Figure 5The lower surface of the seat cushion 1 is formed by the lower surface 2f2 of the soft foam 2. That is, the bead-formed foam 3 is embedded in the soft foam 2 such that its lower surface 3f2 is positioned above the lower surface 2f2 of the soft foam 2. In other words, the soft foam 2 covers the lower surface 3f2 of the bead-formed foam 3 in such a way that its lower surface 2f2 protrudes above the lower surface 3f2 of the bead-formed foam 3. Therefore, by using the seat cushion 1, the lower surface 3f2 of the bead-formed foam 3 can be prevented from directly contacting heat sources, etc. Consequently, the seat cushion 1 has excellent heat resistance. Especially when the bead-formed foam 3 is completely embedded inside the soft foam 2, there is no portion of the lower surface 3f2 of the bead-formed foam 3 exposed on the lower surface 1f2 of the seat cushion 1. Therefore, the heat resistance of the seat cushion 1 is even better. However, using seat cushion 1, for example, as in Figure 6 As shown near the through hole A1 for vehicle mounting, when the flexible foam 2 has an opening leading to the lower surface 3f2 of the bead-type foam 3, an air layer is also formed between the heat source and the lower surface 3f2 of the bead-type foam 3. In this case, the air layer functions as a heat insulation layer.

[0057] Furthermore, in the seat cushion 1, the soft foam 2 includes an upper soft foam 21 covering the upper surface 3f1 of the bead-type foam 3 and a lower soft foam 22 covering the lower surface 3f2 of the bead-type foam 3. In this case, the bead-type foam 3, which is harder than the soft foam 2, can function as the core (seat cushion body) of the seat cushion 1. Therefore, the support stability for the sitter is improved. On the other hand, it is believed that the sitter feels the firmness of the seat cushion 1 in accordance with the improved support stability. In contrast, the sitting side of the seat cushion 1 is covered by the soft foam 2. Therefore, the seat cushion 1 improves comfort when sitting while exhibiting excellent heat resistance.

[0058] In addition, for example, refer to Figure 6 In the seat cushion 1, the bead-formed foam 3 has a through-hole 31 extending vertically, and the upper soft foam 21 and the lower soft foam 22 are connected through the through-hole 31. In this case, by placing the bead-formed foam 3 as an insert inside the molding die and supplying soft foaming resin into the mold, soft foam 2 can be formed on both the upper surface 3f1 and the lower surface 3f2 of the bead-formed foam 3. Therefore, the seat cushion 1 becomes a seat cushion with excellent heat resistance and easy manufacturing.

[0059] Furthermore, in this embodiment, seat cushion 1 is a seat cushion for the rear seat. Generally speaking, heat source devices such as batteries and engines that generate high heat are located under the rear seat. Therefore, as in this embodiment, using seat cushion 1 as a seat cushion for the rear seat is particularly effective.

[0060] In addition, for example, refer to Figure 9 In the seat cushion 1, the bead-blown foam 3 has two under-buttock openings 32, and a through hole 31 is disposed between the two under-buttock openings 32. In this case, the seat cushion 1 becomes a rear seat cushion with excellent heat resistance and easy manufacturing. Furthermore, in this case, since the hardness of the under-buttock portion of the seat cushion 1 is suppressed to a low level, comfort when sitting can also be ensured.

[0061] Furthermore, in the seat cushion 1, the soft foam 2 can be any flexible soft foam. Examples of soft foam 2 include flexible polyurethane foam. Additionally, in the seat cushion 1, the bead-processed foam 3 can be any foam that is harder and more elastic than the soft foam 2. Examples of bead-processed foam 3 include olefin-based resins, specifically bead-processed polypropylene (EPP) and bead-processed polystyrene (EPS). Here, "bead-processed foam" refers to a foam obtained using the so-called bead-processing method. Bead-processed foam is obtained by formally foaming pre-foamed beads within a molding die.

[0062] In the seat cushion 1, it is preferable that the soft foam 2 is made of soft foamed polyurethane, and the beaded foam 3 is made of beaded foamed polypropylene or beaded foamed polystyrene. In this case, by using commonly used soft foam materials and beaded foam materials, a cost-effective seat cushion is achieved. Particularly when the beaded foam 3 is made of beaded foamed polystyrene, beaded foamed polystyrene has lower heat resistance compared to other beaded foams. Therefore, when the beaded foam 3 is made of beaded foamed polystyrene, the application of this invention is effective in improving heat resistance.

[0063] (Seat cushion manufacturing method)

[0064] Next, a method for manufacturing a seat cushion according to an embodiment of the present invention will be described. This manufacturing method is suitable for manufacturing and using... Figures 1 to 13 Seat cushion 1 (instructions)

[0065] like Figure 14As shown, the method for manufacturing a seat cushion according to this embodiment (hereinafter also referred to as "this manufacturing method") is used to obtain a seat cushion in which the outer surface (3f1, 3f2) of the beaded foam 3 with through holes 31 is covered by a soft foam 2 using a molding die 10 with an exhaust portion 11 and a beaded foam 3 with through holes 31. This manufacturing method includes: a beaded foam setting step, in which the beaded foam 3 is arranged inside the molding die 10 such that a gap S is formed between the molding die 10 and the beaded foam 3 and the through holes 31 of the beaded foam 3 are arranged at a position offset relative to the exhaust portion 11; and a foam material supply step, in which, after the beaded foam setting step is completed, the soft foam material is supplied to the interior of the molding die 10 through the through holes 31 of the beaded foam 3 toward the gap S.

[0066] In this manufacturing method, "offset" refers to, for example, Figure 14 The venting portion 11 of the molding die 10 and the through-hole 31 of the bead-type foam 3 are arranged so that they do not overlap. Therefore, the material (resin material) supplied from the through-hole 31 of the bead-type foam 3 will not flow directly into the venting portion 11 of the molding die 10. The venting portion 11 can, for example, be formed in the through-hole of the molding die 10.

[0067] In this manufacturing method, the interior of the molding die 10 is a cavity C formed on the inner side of the molding die 10. The molding die 10 has, for example, an upper die and a lower die. In this case, the cavity C is formed by mating the upper die and the lower die. The cavity C forms the outer shape of the seat cushion 1. Furthermore, the interior of the molding die 10 includes a gap S formed between the molding die 10 and the bead-formed foam 3.

[0068] If, as in this manufacturing method, a bead-type foam body 3 with through holes 31 is placed as an insert in the cavity C of the molding die 10 and a soft foam material is supplied to the cavity C of the molding die 10, then soft foam bodies 2 (21, 22) can be formed on both the upper surface 3f1 and the lower surface 3f2 of the bead-type foam body 3. The lower soft foam body 22 covering the lower surface 3f2 of the bead-type foam body 3 is formed using the gap S formed between the molding die 10 and the bead-type foam body 3. Therefore, the thickness 2t of the lower soft foam body 22 (refer to...) Figure 5 The thickness t2 of the lower soft foam 22 can be increased by widening the gap S interval Ts. Conversely, the thickness t2 of the lower soft foam 22 can be reduced by narrowing the gap S interval Ts.

[0069] On the other hand, if the air generated in the mold cavity C of the molding mold 10 is not properly discharged when the soft foam material is supplied to the mold cavity C of the molding mold 10, the molded article (cushion 1) may be missing due to the lack of filling of the soft foam material. Therefore, it is preferable to form an venting part 11 in the molding mold 10.

[0070] However, even when using a molding die 10 with an exhaust portion 11, there are still cases where the molded product is missing.

[0071] Therefore, based on the results of in-depth experiments and research, the inventors realized that most defects in the molded articles are caused when the venting part 11 of the molding die 10 is aligned with the through hole 31 formed in the bead-type foam body 3. Furthermore, they discovered that the cause of such defects is that the soft foaming material supplied through the through hole 31 of the bead-type foam body 3 directly seals the venting part 11, which is aligned with the through hole 31, while foaming.

[0072] According to this manufacturing method, as described above, when the bead-formed foam 3 is disposed inside the molding die 10, the venting portion 11 of the molding die 10 is disposed at a position offset relative to the through-hole 31 of the bead-formed foam. In this case, even if the soft foam material is supplied towards the gap S through the through-hole 31 of the bead-formed foam 3, the soft foam material will not directly seal the venting portion 11. Therefore, air generated inside the molding die 10, especially in the gap S, is efficiently discharged through the venting portion 11. Thus, according to this manufacturing method, defects that may render the molded article unusable as a product can be suppressed.

[0073] Therefore, according to this manufacturing method, a seat cushion 1 with excellent heat resistance can be easily obtained. Furthermore, refer to... Figure 9 From the top view, the venting portion 11 of the molding die 10 can be arranged in various positions as long as it is located in a position that does not overlap with the through hole 31 of the bead-type foam 3. In addition, there can be at least one venting portion 11.

[0074] In particular, in this manufacturing method, the interval Ts of the gap S is preferably in the range of 5mm to 10mm. In conventional seat cushion manufacturing methods, defects are easily generated when the interval Ts of the gap S is in the range of 5mm to 10mm. Therefore, when the interval Ts of the gap S is in the range of 5mm to 10mm, the use of this manufacturing method is effective in suppressing defects.

[0075] Reference Figure 14In this manufacturing method, the molding die 10 is used such that when a beaded foam 3 is disposed inside the molding die 10, a gap S is formed between the molding die and the beaded foam 3, and an exhaust portion 11 is disposed at a position offset from the through hole 31 of the beaded foam 3. In this case, it is easier to obtain a seat cushion 1 with excellent heat resistance.

[0076] Reference Figures 9-10 In this manufacturing method, the bead-blown foam 3 is used, which has two under-buttock openings 32 and a through hole 31 disposed between the two under-buttock openings 32. In this case, a rear seat cushion with excellent heat resistance can be easily obtained. Furthermore, in this case, since the hardness of the under-buttock portion of the seat cushion 1 is suppressed to a low level, a rear seat cushion that also ensures comfort when sitting can be obtained.

[0077] As described above, according to the present invention, it is possible to provide a seat cushion with excellent heat resistance and a method for manufacturing the seat cushion for easy acquisition of such a seat cushion.

[0078] The above description merely illustrates one embodiment of the present invention, and various modifications can be made according to the claims. For example, the seat cushion 1 may be a cushioning pad, but it can also be a component combining a cushioning pad and a backrest. In this case, the seat cushion of the present invention can be applied to at least any one of a cushioning pad, a backrest, and a cushioning pad. Furthermore, the seat cushion of the present invention may also be only any one of a cushioning pad, a backrest, and a cushioning pad. Moreover, the seat cushion of the present invention can be a seat cushion for a front seat.

[0079] Explanation of reference numerals in the attached figures

[0080] 1. Seat cushion; 1f2. Lower surface of the seat cushion; 2. Soft foam; 2f2. Lower surface of the soft foam; 21. Upper soft foam; 22. Lower soft foam; 3. Beaded foam; 3f1. Upper surface of the beaded foam; 3f2. Lower surface of the beaded foam; 31. Through hole; 32. Under-buttock opening; 10. Molding mold; 11. Venting section; C. Mold cavity; S. Gap.

Claims

1. A seat cushion comprising a cushioning pad, wherein, The cushioning pad comprises a soft foam and bead-based foam embedded in the soft foam. The lower surface of the cushioning pad is formed by the lower surface of the soft foam. The bead-based foam has through holes running vertically through it. The bead-based foam has two underside openings, and the through hole is disposed between the two underside openings.

2. The seat cushion according to claim 1, wherein, The flexible foam body includes an upper flexible foam body covering the upper surface of the bead-type foam body and a lower flexible foam body covering the lower surface of the bead-type foam body.

3. The seat cushion according to claim 2, wherein, The upper soft foam and the lower soft foam are connected by the through holes formed in the bead-type foam.

4. The seat cushion according to any one of claims 1 to 3, wherein, The seat cushion is for the rear seat.

5. The seat cushion according to any one of claims 1 to 3, wherein, The flexible foam is composed of flexible foamed polyurethane. The bead-blown foam is composed of bead-blown polypropylene or bead-blown polystyrene.

6. The seat cushion according to claim 4, wherein, The flexible foam is composed of flexible foamed polyurethane. The bead-blown foam is composed of bead-blown polypropylene or bead-blown polystyrene.

7. A method for manufacturing a seat cushion, comprising using a molding die having an air vent and a bead-type foam having through holes to obtain a seat cushion in which the outer surface of the bead-type foam having the through holes is covered by a soft foam, wherein, The method for manufacturing this seat cushion includes: The bead-forming foam assembly process involves arranging the bead-forming foam inside the molding die such that a gap is formed between the molding die and the bead-forming foam, and the through holes of the bead-forming foam are positioned offset relative to the venting portion. as well as In the foam material supply process, after the bead-type foam body setting process is completed, the soft foam material is supplied into the interior of the molding die through the through holes of the bead-type foam body toward the gap.

8. The method for manufacturing a seat cushion according to claim 7, wherein, As the molding die, a molding die is used such that when the beaded foam is disposed inside the molding die, a gap is formed between the molding die and the beaded foam, and the through hole of the beaded foam is disposed at a position offset relative to the venting portion.

9. The method for manufacturing a seat cushion according to claim 7 or 8, wherein, As the bead-formed foam, a bead-formed foam is used that has two underside openings, and the through hole is disposed between the two underside openings.

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