JP2019018476A - Production method for seat pad and mold - Google Patents

Abstract

To provide a production method for a seat pad capable of preventing a filling defect from occurring around a groove on a side surface of a seat pad.SOLUTION: A production method for a seat pad includes an injection step of injecting a raw material of flexible foam into a bottom surface 22 of a lower die 21 in a molding die, and a foaming step of covering the lower die 21 with an upper die of the molding die and foaming the seat pad. The molding die includes a protrusion 24 protruding from a side surface 23 connected to the bottom surface 22 of the lower mold 21 and continuing from the bottom surface 22 toward the upper mold 21 and a convex part 38 protruding from the protrusion 24 in a height direction of the protrusion 24.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a seat pad manufacturing method and a molding die, and more particularly to a seat pad manufacturing method and a molding die that can hardly cause a filling failure around a groove.

  In general, in a vehicle seat disposed in an automobile or the like, a seat pad made of a flexible foam such as a flexible polyurethane foam is covered with a skin material. In the vehicle seat disclosed in Patent Document 1, the skin material is fixed to the seat pad in a state in which a part of the skin material is drawn into a groove formed from the surface of the seat pad to the side surface. . The seat pad is molded by foaming the raw material of the flexible foam injected into the bottom surface of the lower mold of the mold. By projecting the ridge portion from the bottom surface to the side surface of the mold, the raw material injected into the bottom surface of the mold swells and fills the mold while ascending both sides of the ridge portion along the side surface. Thereby, the groove | channel from the surface of a seat pad to a side surface is made.

JP, 2006-87196, A

  However, in the above-described conventional technique, a difference occurs in the amount of expansion of the raw material that rises on both sides of the ridge along the side surface, and when one raw material climbs over the ridge, a portion that is a shadow of the ridge ( There is a problem that poor filling is likely to occur around the corners of the side surface and the protruding portion, that is, around the groove of the seat pad.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a seat pad manufacturing method and a mold that can hardly cause poor filling around a groove on a side surface of the seat pad.

  In order to achieve this object, the seat pad manufacturing method of the present invention includes an injection step of injecting a raw material of a flexible foam into the bottom surface of a lower mold of the mold, and a seat pad by covering the upper mold with the lower mold. And a foaming step of foam-molding. The molding die includes a protrusion protruding from a side surface connected to the bottom surface of the lower mold and extending from the bottom surface toward the upper mold, and a protrusion protruding from the protrusion in the height direction of the protrusion. Yes.

  In the molding die of the present invention, a flexible foam seat pad is molded in a space surrounded by a lower die and an upper die. A protrusion that protrudes from the side surface of the mold connected to the bottom surface of the lower mold and that extends from the bottom surface toward the upper mold, and a protrusion that protrudes from the protrusion in the height direction of the protrusion. .

  According to the manufacturing method of the seat pad according to claim 1, the ridges are continuous from the bottom surface of the lower mold to which the raw material of the flexible foam is injected toward the upper mold, and from the ridges in the height direction of the ridges. The convex part protrudes. Since the convex portion blocks the expanding raw material from going over the ridge portion, it is possible to make it difficult to cause poor filling at the corners of the side surface of the mold and the ridge portion. Therefore, it is possible to easily cause a filling failure around the groove of the seat pad.

  According to the manufacturing method of the seat pad according to claim 2, the protrusion provided on the upper mold side portion of the ridge portion more than ½ of the creeping distance from the bottom surface of the lower mold to the end portion on the upper mold side. The portion can prevent the raw material that becomes harder and lowers in fluidity as it approaches the upper die from getting over the ridge. As a result, in addition to the effect of the first aspect, the length of the concave portion formed by the convex portion with respect to the length of the groove can be shortened while suppressing the filling failure around the groove formed by the protruding portion.

  According to the method for manufacturing a seat pad according to claim 3, the side surface is composed of a plurality of surfaces defined by corners or corners, and the protrusion is in one surface including the corners and corners among the plurality of surfaces. A plurality are formed. Since a plurality of ridges are formed in one surface, it is easy to form a filling defect along the ridge, but at least one of the plurality of ridges formed in one surface. In addition to the effect of claim 1 or 2, it is possible to make it difficult for poor filling to occur on the side surface of the seat pad where a plurality of grooves are formed.

  According to the shaping | molding die of Claim 4, the seat pad made from a flexible foam is shape | molded in the space enclosed by the lower mold | type and the upper mold | type. A protrusion that protrudes from the side surface of the mold connected to the bottom surface of the lower mold and that extends from the bottom surface toward the upper mold, and a protrusion that protrudes from the protrusion in the height direction of the protrusion. . Therefore, the same effect as in the first aspect is obtained.

It is a front view of the seat pad in one embodiment of the present invention. It is a perspective view of the front side of a seat pad. It is a perspective view of the back side of a seat pad. It is sectional drawing of the shaping | molding die in 1st Embodiment. It is a top view of a lower mold. It is a perspective view of the side surface of a lower mold. (A) is a schematic diagram of the raw material which expand | swells along a protrusion part, (b) is a schematic diagram of the raw material by which the movement was interrupted | blocked by the convex part. (C) is a schematic diagram of the raw material which expands along the protrusion part of the shaping | molding die in a comparative example, (d) is a schematic diagram of the raw material which got over the protrusion part, (e) is FIG.7 (d). Is a cross-sectional view of a forming die and a raw material in line VIIe-VIIe. It is sectional drawing of a part of shaping | molding die in 2nd Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. 1 is a front view of a seat pad 10 according to an embodiment of the present invention, FIG. 2 is a front perspective view of the seat pad 10, and FIG. 3 is a rear perspective view of the seat pad 10. As shown in FIG.

  As shown in FIGS. 1 and 2, the seat pad 10 is a back pad that supports the back of an occupant of an automobile, and is located at the main portion 11 located at the center in the left and right width direction and at the left and right in the width direction of the main portion 11. And a headrest 13 provided at the upper end of the main portion 11, and these are integrally formed of a flexible foam (for example, a flexible polyurethane foam). The side part 12 is greatly raised on the front side in the thickness direction (the front side in FIG. 1) with respect to the main part 11 in order to restrict the left and right movement of the occupant's torso.

  The seat pad 10 has a first groove 14 formed at the boundary between the main portion 11 and the side portion 12, and a second groove 15 formed at the boundary between the main portion 11 and the headrest 13. A third groove 16 that connects the first grooves 14 to each other is formed in the main portion 11. In the seat pad 10, locking members (not shown) such as wires and clips are embedded in the back of the first groove 14, the second groove 15, and the third groove 16.

  On the other hand, a part that engages with a locking member embedded in the seat pad 10 is attached to a skin material (not shown) that covers the seat pad 10. By engaging the parts of the skin material with the locking member embedded in the seat pad 10, a part of the skin material is drawn into the first groove 14, the second groove 15, and the third groove 16. The part 11, the side part 12, and the headrest 13 are covered with a skin material. A recess 17 (see FIG. 2) that is further recessed than the first groove 14 is formed in a portion of the first groove 14 on the headrest 13 side.

  The means for attaching the skin material (not shown) to the seat pad 10 is to engage a part (not shown) attached to the skin material with a locking member (not shown) embedded in the seat pad 10. Not limited to. Of course, it is possible to bond the skin material (not shown) to the seat pad 10 by omitting the locking member and the skin material parts of the seat pad 10. In that case, the first groove 14, the second groove 15, and the third groove 16 of the seat pad 10 are accommodated in contact portions where members constituting the skin material are joined together. As a result, the protrusion of the skin material due to the contact can be eliminated.

  As shown in FIG. 3, the seat pad 10 includes a first projecting portion 18 that projects from the upper edges of the headrest 13 and the main portion 11 to the back (back) side of the headrest 13 and the main portion 11, and both left and right sides of the side portion 12. A second projecting portion 19 is provided to project from the edge portion to the back surface (back surface) side of the main portion 11. The first overhanging portion 18 is provided so as to cover the entire back surface side of the headrest 13 and a part of the upper side of the main portion 11. The second overhanging portion 19 is provided so as to cover part of the left and right sides on the back side of the main portion 11, and the upper end of the second overhanging portion 19 is connected to the lower end of the first overhanging portion 18. It should be noted that a reinforcing cloth such as a nonwoven fabric is bonded to the surface of the first overhanging portion 18 and the second overhanging portion 19 on the main portion 11 side and the back surface of the main portion 11 in an integrated state. The illustration of the reinforcing cloth is omitted.

  Next, a method for manufacturing the seat pad 10 will be described with reference to FIG. FIG. 4 is a cross-sectional view of the mold 20 in the first embodiment. The mold 20 is used for forming the seat pad 10. In FIG. 4, the first protrusion 24, the second protrusion 25, and the third protrusion 26 (all of which will be described later) formed on the lower mold 21 are omitted for easy understanding. Has been.

  As shown in FIG. 4, the mold 20 includes a lower mold 21 in which a bottom surface 22 that molds the surface of the seat pad 10 (see FIG. 2) and a side surface 23 that forms the side surface of the seat pad 10 are connected, and a lower mold 21. And an upper die 41 attached to the lower die 21 so as to be openable and closable by a hinge 40 arranged on one side. The upper die 41 has a molding surface 42 that molds the back side of the seat pad 10. When the upper die 41 is closed with respect to the lower die 21, the parting surface 43 connected to the molding surface 42 of the upper die 41 is brought into close contact with the parting surface 36 connected to the side surface 23 of the lower die 21. A space 46 surrounded by 21 and the upper mold 41 is formed. A middle mold 44 is disposed between the lower mold 21 and the upper mold 41.

  The middle mold 44 is a member that molds the first projecting portion 18, the second projecting portion 19, and the back surface side of the main portion 11 of the seat pad 10 (see FIG. 3). The middle die 44 is provided so as to be relatively movable with respect to the upper die 41 by a driving device 45 provided on the upper die 41, and is attached to and detached from the upper die 41 by driving the driving device 45.

  FIG. 5 is a plan view of the lower mold 21. In FIG. 5, a portion of the lower mold 21 that molds the headrest 13 side of the seat pad 10 is illustrated, and a portion that molds the lower side of the main portion 11 is not illustrated. As shown in FIG. 5, the lower mold 21 has a bottom surface 22, a side surface 23, and a parting surface 36 connected to each other.

  The lower mold 21 includes first protrusions 24 and 24, a second protrusion 25, and second protrusions 25 for forming the first groove 14, the second groove 15, and the third groove 16 of the seat pad 10 (see FIG. 2), respectively. The third protrusion 26 protrudes from the bottom surface 22. The pair of first protrusions 24, 24 are formed with a space therebetween. The second ridge portion 25 is arranged at a distance from the first ridge portion 24, and the third ridge portion 26 is connected to the first ridge portion 24. The bottom surface 22 is divided into a first region 27, a second region 28, and a third region 29 by the first protrusions 24, 24, the second protrusion 25, and the third protrusion 26. The first region 27 is a region for molding the headrest 13 (see FIG. 2), the second region 28 is a region for molding a portion of the main portion 11 on the headrest 13 side, and the third region 29 is for molding the side portion 12. It is an area to do.

  The side surface 23 includes a plurality of surfaces partitioned by corners 30 and 32 and corners 31. The side surface 23 is defined by a first surface 33 defined by the corner 30 and the corner 31 and including the corner 30 and the corner 31, a second surface 34 defined by the corner 30 and including the corner 30, and the corner 31 and the corner 32. And a third surface 35 that is partitioned and includes corners 31 and corners 32. The first surface 33 is a surface that continues to a part of the second region 28 and the third region 29 in the bottom surface 22. The second surface 34 is a surface continuous with the third region 29 in the bottom surface 22. The third surface 35 is a surface that is continuous with the first region 27 in the bottom surface 22.

  FIG. 6 is a perspective view of the side surface 23 (mainly the first surface 33) of the lower mold 21. FIG. The first protrusion 24 extends from the bottom surface 22 to the first surface 33 and protrudes from the bottom surface 22 and the first surface 33. A convex portion 38 that protrudes from the first protrusion 24 in the height direction of the first protrusion 24 is connected to a portion of the first protrusion 24 that is provided on the first surface 33. The convex portion 38 is closer to the parting surface 36 side than 1/2 of the creepage distance D from the bottom surface 22 of the lower mold 21 to the end portion 37 on the upper mold 41 (see FIG. 4) side of the first protrusion 24. Is provided.

  The width of the protrusion 38 is substantially the same as the width of the first protrusion 24, and the height of the protrusion 38 from the first protrusion 24 is from the first surface 33 of the first protrusion 24. It is almost the same as the height. The length of the convex portion 38 (the dimension in the length direction of the first ridge portion 24) is set to 1/2 or less of the creeping distance D. In the present embodiment, the convex portion 38 is set to have a height of 15 mm or less and a length of 15 mm or more. The convex portion 38 is tapered in the height direction from the first surface 33 in order to facilitate removal from the lower mold 21 of the seat pad 10.

  A second protrusion 25 that extends from the bottom surface 22 to the first surface 33 is provided at the corner 31 of the first surface 33. The distance from the first protrusion 24 to the second protrusion 25 on the first surface 33 (the dimension excluding the width of the first protrusion 24 and the second protrusion 25) is 50 mm or less, and from the corner 30 It is shorter than the distance to the first ridge 24 (the dimension excluding the width of the first ridge 24).

  In order to manufacture the seat pad 10 using the molding die 20 (see FIG. 4), first, the molding die 20 is opened, the driving device 45 is driven, and the middle die 44 is detached from the upper die 41. A reinforcing cloth (not shown) is placed on the middle mold 44 and fixed with pins or the like. Next, the driving device 45 is driven to bring the middle die 44 into close contact with the upper die 41. In the injection step, a liquid raw material (not shown) in which polyol, isocyanate, foaming agent, etc. are mixed is injected into the bottom surface 22 (first region 27, second region 28, third region 29, etc.) of the lower mold 21. To do. After covering the lower mold 21 with the upper mold 41 and bringing the parting surfaces 36 and 43 into close contact with each other, in the foaming process, the raw material is foamed in the mold 20 and cured for a predetermined time to form the seat pad 10. . After molding, the upper mold 41 is opened with respect to the lower mold 21, the driving device 45 is driven to detach the middle mold 44 from the upper mold 41, and then the seat pad 10 is removed from the middle mold 44.

  Next, the raw materials 47 and 48 that foam in the mold 20 and the mold 50 in the comparative example will be described with reference to FIG. In addition, since the shaping | molding die 50 in a comparative example is the same as said shaping | molding die 20 except the convex part 38 being abbreviate | omitted, about the same part as the shaping | molding die 20, the same code | symbol is attached | subjected and the following description is carried out. Omitted.

  FIG. 7A is a schematic diagram of the raw materials 47 and 48 that expand along the first ridge portion 24 of the first surface 33, and FIG. 7B shows the raw material 47 whose movement is blocked by the convex portion 38. It is a schematic diagram. FIG. 7C is a schematic view of the raw materials 47 and 48 that expand along the first ridge 24 of the first surface 33 of the conventional mold 50, and FIG. 7D shows the first ridge 24. 7E is a schematic view of the raw material 47, and FIG. 7E is a cross-sectional view of the forming die 50 and the raw material 47 along the line VIIe-VIIe of FIG. 7D.

  The raw materials 47 and 48 are, for example, expanded raw materials mixed with polyol, isocyanate, foaming agent and the like. The raw materials 47 and 48 are injected into the third region 29 and the second region 28, respectively, but are integrated in the process of foaming and expanding. In FIGS. 7 (a) to 7 (d), in order to simplify the illustration and facilitate understanding, the illustration of the integrated portion (the portion on the front side of the paper) of the raw materials 47 and 48 is omitted. A portion that expands along one surface 33 is shown.

  As shown in FIG. 7C, in the mold 50, the speed at which the raw material 47 injected into the third region 29 expands is faster than the speed at which the raw material 48 injected into the second region 28 expands. This is because the raw material 47 to be injected into the third region 29 mainly forms the side portions 12 that are largely raised of the seat pad 10 (see FIG. 2), so that the raw material 48 that mainly forms the upper portion of the main portion 11 is the first. This is because the amount of the raw material 47 injected into the third region 29 is larger than the amount injected into the second region 28. Even if there is a difference in the expansion speed, as shown in FIG. 7C, when the expansion amount of the raw materials 47 and 48 is relatively small, the raw materials 47 and 48 are first along the first protrusion 24. The surface 33 is raised.

  However, as shown in FIG. 7D, when the expansion amount of the raw materials 47 and 48 increases, the raw material 47 is less likely to be restricted by the raw material 48, and may sometimes get over the first protrusion 24. When the expanded raw material 47 gets over the first protrusion 24, as shown in FIG. 7E, the corner 49 between the first surface 33 and the first protrusion 24, that is, the seat pad 10 (see FIG. 2). Insufficient filling is likely to occur around the first groove 14. Since the expanding material 47 becomes harder as it approaches the upper mold 41 and its fluidity decreases, the cavity 51 formed at the corner 49 between the first surface 33 and the first protrusion 24 is difficult to be filled with the material 47.

  On the other hand, as shown in FIG. 7 (a), since the mold 20 is provided with the convex portion 38 on the first protrusion 24, the expansion of the raw materials 47 and 48 as shown in FIG. 7 (b). Even if the amount becomes large and the raw material 47 is less likely to be restricted by the raw material 48, the raw material 47 is blocked by the convex portion 38 and cannot get over the first protrusion 24. As a result, since the raw materials 47 and 48 expand on both sides of the first protrusion 24 along the first surface 33, corners 49 between the first surface 33 and the first protrusion 24 (see FIG. 7E). ), I.e., poor filling around the first groove 14 of the seat pad 10 (see FIG. 2).

  Further, in the first protrusion 24, a convex portion is formed on a portion on the upper die 41 side of 1/2 of the creeping distance D from the bottom surface 22 of the lower die 21 to the end portion 37 on the upper die 41 side (see FIG. 6). Since 38 is provided, the raw material 47 that becomes harder and lowers in fluidity as it approaches the upper die 41 can be prevented from getting over the first protrusion 24. As a result, it is possible to improve the effect of suppressing defects near the upper mold 41 where filling defects are likely to occur. Furthermore, the length of the concave portion 17 formed by the convex portion 38 can be shortened with respect to the length of the portion between the headrest 13 and the side portion 12 in the first groove 14 (see FIG. 2). Since the concave portion 17 formed by the convex portion 38 does not participate in the function of the first groove 14 for drawing a part of the skin material (not shown), the length of the concave portion 17 is preferably short.

  In particular, since the convex portion 38 is set to have a height of 15 mm or less and a length of 15 mm or more, the material 47 is moved by the convex portion 38 while the depth of the concave portion 17 formed by the convex portion 38 is reduced. The effect of regulation can be secured.

  On the first surface 33 including the corners 30 and the corners 31, the first protrusions 24 and the second protrusions 25 are provided with a space therebetween. In the first surface 33, the distance from the first protrusion 24 to the second protrusion 25 is shorter than the distance from the corner 30 to the first protrusion 24. Among these, it is more difficult to enter the region from the first ridge 24 to the second ridge 25 than the region from the corner 30 to the first ridge 24. Therefore, if the expanded raw material 47 gets over the first protrusion 24, a filling failure is likely to occur between the first protrusion 24 and the second protrusion 25.

  On the other hand, since the convex part 38 is provided in the 1st protrusion part 24 in the shaping | molding die 20, the overcoming of the raw material 47 is prevented, and the 1st protrusion part 24 and the 2nd protrusion part 25 which are easy to produce a malfunction It is possible to make it difficult to cause poor filling between the two. In particular, since the distance from the 1st protrusion part 24 to the 2nd protrusion part 25 is as short as 50 mm or less, this effect can be remarkable.

  Next, a second embodiment will be described with reference to FIG. In 1st Embodiment, the shaping | molding die 20 by which the convex part 38 is formed in the protrusion part (1st protrusion part 24) of the lower mold | type 21 was demonstrated. On the other hand, in 2nd Embodiment, the shaping | molding die 60 by which the convex part 69 is formed in the protrusion part (upper protrusion part 68) of the upper mold | type 66 is demonstrated. In addition, about the part same as the part demonstrated in 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. FIG. 8 is a cross-sectional view of a part of the molding die 60 in the second embodiment. In FIG. 8, illustration of the middle mold 44 disposed between the lower mold 61 and the upper mold 66 of the mold 60 is omitted.

  As shown in FIG. 8, in the mold 60, a side surface 63 that forms the side surface of the seat pad 10 is connected to a bottom surface 62 that molds the surface of the seat pad 10 (see FIG. 2). The upper die 66 is attached to the lower die 61 so as to be openable and closable by a hinge (not shown) arranged on one side of the lower die 61. When the upper die 66 is closed with respect to the lower die 61, the parting surface 67 of the upper die 66 comes into close contact with the parting surface 64 of the lower die 61.

  The mold 60 includes a lower protrusion 65 that extends from the bottom surface 62 and the side surface 63 and is connected to the bottom surface 62 and the side surface 63 of the lower mold 61, and an upper protrusion 68 that protrudes from the side surface 63 of the upper mold 66. Yes. With the parting surfaces 64 and 67 in close contact with each other, the lower protrusion 65 and the upper protrusion 68 are continuous from the lower mold 61 to the upper mold 66. The protrusion 69 protrudes from the upper protrusion 68 in the height direction of the upper protrusion 68.

  The convex portion 69 is a portion of the lower protrusion 65 and the upper protrusion 68 that is closer to the upper mold 66 than 1/2 of the creepage distance D from the bottom surface 62 of the lower mold 61 to the end 70 on the upper mold 66 side. Is provided. The creepage distance D is a distance from the intersection 71 between the line extending the bottom surface 62 and the line extending the side surface 63 to the end 70 of the upper protrusion 68. Thereby, according to the shaping | molding die 60 in 2nd Embodiment, the effect similar to the shaping | molding die 20 in 1st Embodiment is realizable.

  Although the present invention has been described based on the embodiment, the present invention is not limited to this embodiment, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed. For example, the shape of the seat pad 10, the shapes and sizes of the first groove 14, the second groove 15, and the third groove 16 are examples, and can be set as appropriate. Of course, it is possible to omit the third groove 16.

  In the embodiment, the seat pad 10 mounted on the automobile has been described. However, the seat pad 10 is not limited to this, and may be a seat pad 10 mounted on various vehicles such as ships, airplanes, and railways. Moreover, although each embodiment demonstrated the case where the seat pad 10 was a back pad which supports a passenger | crew's back, it is not necessarily restricted to this. Of course, the seat pad 10 can be a cushion pad.

  In the embodiment, the case where the convex portion 38 is formed on the first ridge portion 24 among the first ridge portion 24 and the second ridge portion 25 formed on the first surface 33 has been described. It is not limited to. Of course, it is possible to provide the convex part 38 in the 2nd protrusion part 25 in addition to the 1st protrusion part 24. FIG.

  In the embodiment, the case where the first protrusions 24 and the second protrusions 25 are formed on the first surface 33 defined by the corners 30 and 31 has been described. However, the present invention is not necessarily limited thereto. . Depending on the shape and type of the seat pad 10, the surface on which the first protrusions 24 and the second protrusions 25 are formed is suitably a surface between corners or a surface between corners. Is set.

  In the embodiment, the case where the middle mold 44 is provided in the molds 20 and 60 has been described, but the present invention is not necessarily limited thereto. Of course, the middle mold 44 can be omitted depending on the shape and type of the seat pad 10.

10 Seat Pad 20, 60 Mold 21, 61 Lower Mold 22, 62 Bottom 23, 63 Side 24 24 First Projection (Projection)
25 Second ridge (ridge)
30 corners 31 corners 33 1st surface 37 edge 38,69 convex part 41,66 upper mold 46 space 65 lower ridge part (ridge part)
68 Upper ridge (ridge)
D Creepage distance

Claims (4)

A method of manufacturing a seat pad comprising: an injection step of injecting a raw material of a flexible foam into a bottom surface of a lower die of the molding die; and a foaming step of foam-molding the seat pad by covering the lower die with the upper die of the molding die Because
The molding die protrudes from a side surface connected to the bottom surface of the lower die, and a ridge portion continuous from the bottom surface toward the upper die,
A method of manufacturing a seat pad, comprising: a protrusion protruding from the protrusion in the height direction of the protrusion.   The said convex part is provided in the part on the said upper mold side rather than 1/2 of the creeping distance from the said bottom face of the said lower mold to the edge part on the said upper mold side among the said protrusions. Manufacturing method for seat pad. The side surface includes a plurality of surfaces defined by corners or corners,
A plurality of the protrusions are formed in one surface including the corner and the corner among the plurality of surfaces,
3. The seat pad manufacturing method according to claim 1, wherein the convex portion is formed on at least one of the plurality of protrusions formed in the one surface. 4. A molding die in which a seat pad made of flexible foam is molded in a space surrounded by a lower die and an upper die,
Projecting from the side surface of the mold connected to the bottom surface of the lower mold, and a ridge portion continuing from the bottom surface toward the upper mold,
And a convex part protruding from the protruding part in the height direction of the protruding part.

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