JP6324276B2 - Manufacturing method of seat pad and foaming mold for manufacturing the same - Google Patents

Description

  The present invention relates to a method for manufacturing a seat pad constituting a vehicle seat and a foaming mold for manufacturing the seat pad.

  There are seat pads such as a seat cushion and a seat back constituting a seat portion and a backrest of a seat seat mounted on a vehicle such as an automobile. A side seat pad as shown in FIG. 1 disposed between the back pad for backrest of the rear seat and the door has an opening 50 for taking out a seat belt, a lever and the like at the upper part. Conventionally, the seat pad 5 having such an opening 50 has been manufactured using a foaming mold as shown in FIG. When the lower mold 8 and the upper mold 9 are closed, the opening 50 is formed so that the lower mold seal portion 84 and the upper mold seal portion 94 are in close contact with each other. Specifically, in the mold open state, a foaming raw material was injected into the lower mold surface 81 and the mold was closed, and then the side seat pad 5 as shown in FIG. 1 was foam molded by foam molding. However, in order to guide the foaming raw material injected onto the main mold surface 82 of the lower mold 8 to the distal end region mold surface 83 for the distal end portion 5b, narrow channels on both sides forming the opening 50 are provided with arrows in FIG. It had to proceed as shown above, and the resistance to the flow of the foaming raw material was great. In particular, when the tip region mold surface 83 extends from the opening 50 to form an upward inclined surface, the foam material flows out to the main mold surface 82 even if the foam material is directly injected into the tip region mold surface 83. Thus, it is difficult to keep the foaming raw material on the tip region mold surface 83. For this reason, the side wall pad 5 formed by foaming tends to have a lacking portion K, which has a problem of yield reduction. In order to improve such a problem, for example, an invention in which a bypass portion is provided has been proposed (Patent Document 1).

JP 2002-336089 A

However, in the seat pad manufacturing method based on Patent Document 1, it is necessary to cut off the bypass portions one by one after the foam molding, and post-cutting processing becomes troublesome. In the case of the seat pad 5 where the thickness of both sides of the opening 50 as shown in FIG. 1 is thin, it is difficult to fill the leading end portion 5b of the opening 50 with the foaming raw material, so the number of bypass parts must be increased. . As the number increases, the burden increases. Moreover, since the cross-sectional diameter of the bypass portion is small, the resistance is still large with respect to the foaming raw material flowing through the bypass portion, and it is difficult to feed the foaming raw material through the bypass portion to the necessary portion.
Further, the excision trace of the bypass portion becomes a part of the design surface, and post-processing processing becomes difficult in addition to cutting processing. In addition, when the opening 50 is large as shown in FIG. 1 and the supply amount of the foaming raw material to the tip portion 5b at the tip of the opening 50 is large, the cross-sectional area of the bypass portion is temporarily increased. Even if it can be done, it doesn't end with the problem of post-processing. The bypass portion is a material loss portion, and there is a problem that an increase in material loss cannot be avoided.

  The present invention solves the above-mentioned problem, and can reduce the material loss of the foaming raw material, further reduce the burden of post-processing, etc., and eliminate the lacking portion that has occurred at the tip of the opening. An object of the present invention is to provide a seat pad manufacturing method and a foaming mold for manufacturing the seat pad.

In order to achieve the above object, the gist of the invention described in claim 1 is that an opening provided near the one end from the main body is formed by injecting a foaming raw material into the lower mold, then closing the mold, and subsequently performing foam molding. In the method of manufacturing the seat pad with the tip portion extended, a recess having an upper surface opening opening of a size corresponding to the opening is directed downward in a lower mold surface portion corresponding to the opening. On the other hand, the upper mold is formed with a convex portion that enters the recess when the mold is closed, and after the foaming raw material is injected into the lower mold surface and the foaming raw material is accumulated in the recess, the mold is closed when the mold is closed. The seat pad manufacturing method is characterized in that the protruding raw material enters and the foaming raw material accumulated in the depression is pushed out to the cavity side of the tip portion. According to a second aspect of the present invention, there is provided a seat pad manufacturing method according to the first aspect, wherein the main body main part is formed on the main surface of the lower mold, and the lower end tip region mold is formed by extending the depression. An upper mold that opens and closes with a hinge provided on one end side of the lower mold on which the tip area mold surface is located is attached to the upper mold, and the upper mold is closed. The side surface of the recess that forms the other end surface away from the hinge is squeezed so that the side surface of the projection that forms the other end surface away from the hinge is grazed. It is characterized by entering toward. The manufacturing method of the seat pad according to the invention of claim 3 is the invention according to claim 2, wherein the tip region mold surface is an upward inclined mold surface with the tip side facing upward with respect to the main mold surface arranged almost horizontally. An upper die that opens and closes with a hinge provided on one end side of the lower die having the upward inclined die surface as a tip is formed with the tip portion facing upward with respect to the main body portion disposed horizontally. It is characterized by that.
According to a fourth aspect of the present invention, there is provided a seat pad manufacturing method according to the second or third aspect, wherein the recess has a side wall surface that is a surface on the other end side far from the hinge, and the outer side faces from the bottom of the recess toward the upper surface opening. Forming an upwardly inclined surface inclined in the direction of the mold and closing the mold, the dimension of the gap between the side surface on the other end side of the convex portion that has entered the recess and the side wall surface on the other end side of the recess opposite to the convex portion. It is characterized in that it is set smaller than the size of the gap between the side surface on one end side near the hinge side of the convex portion and the side wall surface on one end side of the recess facing this. The manufacturing method of the seat pad which is invention of Claim 5 is Claim 2-4, The mold is closed, The side of the other end side of the said convex part which entered into the said depression, and the other end side of the said depression facing this The gap with the side wall surface is narrowed, and at least a part thereof is in contact with the side wall surface.
The gist of the invention described in claim 6 is that in the foaming mold for manufacturing a seat pad having a tip portion extending at the tip of an opening provided near one end from the main part of the main body, the main body is placed on the lower mold surface. A main mold surface forming a main portion; a lower mold surface portion corresponding to the opening portion; a depression having a top opening opening of a size corresponding to the opening portion and recessed downward; and the main mold surface A tip region mold surface for the tip portion extending from the depression through the depression, and the upper mold is provided with a convex portion that enters the depression when the mold is closed. The foaming mold for manufacturing a seat pad is characterized in that the convex portion enters the recess and the foaming raw material accumulated in the recess is pushed out to the cavity side of the tip portion.

  The seat pad manufacturing method and the foaming mold for manufacturing the seat pad according to the present invention can reduce post-processing burden and material loss, achieve stable quality of the seat pad product, improve yield, etc., and exhibit excellent effects.

It is the perspective view of the seat pad seen from the surface side in one form of the manufacturing method of the seat pad concerning the present invention, and its foaming type for manufacture. It is a perspective view of the seat pad upper part seen from the back side. It is a principal part perspective view of the foaming type in a mold open state. It is explanatory drawing sectional drawing of the foaming type under injection | pouring of a foaming raw material in a mold open state. FIG. 5 is a cross-sectional view of the main part after the injection of the foaming raw material is completed from the state of FIG. 4 and the mold is closed. (A) is sectional drawing which has inject | poured the foaming raw material in a mold open state, (b), (c) is principal part sectional drawing of a mode that the foaming raw material which exists in a hollow from (b) is extruded. It is an expanded sectional view around the dent under mold closing. It is explanatory drawing which shows a mode that a seat pad is foam-molded after mold closing. It is a principal part expanded sectional view of the other aspect replaced with FIG. It is explanatory drawing of a prior art. It is explanatory drawing of a prior art.

Hereinafter, the manufacturing method of the seat pad which concerns on this invention, and its foaming mold for manufacture are explained in full detail.
1 to 9 show an embodiment of a seat pad manufacturing method and a foaming mold for manufacturing the seat pad according to the present invention. FIG. 1 is an overall perspective view of the seat pad as viewed from the front side, and FIG. 2 is a seat pad as viewed from the back side. FIG. 3 is a perspective view of the main part of the foaming mold, FIG. 4 is an explanatory sectional view of the foaming mold in the mold open state and under the injection of the foaming raw material, and FIG. 5 is the injection of the foaming raw material from the state of FIG. 6 is a cross-sectional view of the main part after closing the mold, FIG. 6 is a cross-sectional view in which (a) is injecting the foaming raw material in the mold open state, and (b) and (c) are cross-sectional views in which the mold is closed from (a) 7 is an enlarged cross-sectional view around the recess when the mold is closed, FIG. 8 is an explanatory cross-sectional view showing a state where the seat pad is foam-molded, and FIG. 9 is a cross-sectional view of the main part of another embodiment instead of FIG. In order to make the drawings easy to understand, each part is drawn in a simplified manner.

The seat pad manufacturing method and the foaming mold for manufacturing the seat pad are installed between a back pad and a door constituting the seat back of the rear part of the vehicle, and the side seat pad 5 separate from the back pad (hereinafter simply referred to as “seat”). It is also referred to as a pad.) The side seat pad 5 is a foam-molded product having a main body 5a having a narrow width with respect to a vertically long shape as shown in FIG. In use, the cushioned thick plate main body 5a is arranged side by side in the vehicle width direction in accordance with the back pad that is slightly inclined upward toward the rear of the vehicle. The portion 5b is formed to extend rearward of the vehicle. A lever or seat belt opening 50 as shown in FIG. 1 is provided from the upper end region of the main body 5a to the introduction region of the tip 5b. Reference numeral 5c is a contact part to the side wall of the back pad, and reference numeral 5d is a contact part to the door periphery forming part, which becomes a hidden part after the assembly to the vehicle.
In the manufacture of the seat pad 5, after injecting the foaming raw material g into the lower mold 2, the mold is closed and subsequently foam-molded, and the tip portion 5b is provided at the tip of the opening 50 provided near one end from the main body 5a. Is formed, and prior to this, the foaming mold 1 for manufacturing the seat pad 5 is prepared.

  The foaming mold 1 for manufacturing the seat pad 5 is a split mold, and is a mold for foam-molding the side seat pad 5 of FIG. 3 to 8, it is a divided type and includes a lower die 2 and an upper die 3. When the mold is closed as shown in FIGS. 4 to 5 with the hinge 4 as a fulcrum, the mold surface 21 of the lower mold 2 and the mold surface 31 of the upper mold 3 having a large degree of depression as a whole are used to form the side seat pad 5. Cavity C is formed. Following the fitting portion between the cavity C1 for the main body main portion 5a, the recess 25 for the opening 50 of the seat pad 5 and the convex portion 35, a cavity C2 for the tip portion 5b is formed at the tip.

The mold surface 21 of the lower mold 2 includes a main mold surface 22 that forms the main body 5a, a recess 25 that is recessed at the mold surface portion of the lower mold 2 that corresponds to the opening 50, and the main mold surface 22 through the recess 25. And a distal end region mold surface 23 for the distal end portion 5b (FIG. 4). The depression 25 becomes a reservoir for the foaming raw material g. A corner 3f on one end side of the upper mold 3 that opens and closes with the hinge 4 as a fulcrum is attached to the upper end portion 2e on one end side of the lower mold 2 on which the tip region mold surface 23 exists. Here, “one end side” as used in the present invention refers to the side having the distal end region mold surface 23, the hinge 4 side, and in FIGS. The “other end side” refers to the side opposite to the side where the tip region mold surface 23 is located, and in FIGS.
The upper die 3 is provided with a convex portion 35 that enters the recess 25 when the die is closed. The recess 25 is a projection 35 having a structure for extruding the foaming raw material g in the recess 25.

The recess 25 has an upper surface opening 25u having a size corresponding to the opening 50 and is recessed downward in a quadrangular pyramid shape (FIG. 3). The recess 25 forms an upper inclined surface in which the side wall surface 26 which is the other end side far from the hinge 4 is inclined outward from the recess bottom 25b toward the upper surface opening 25u (FIG. 4). The side close to the hinge 4 with respect to the side wall surface 26 is a side wall surface 27 that is substantially vertical.
The convex portion 35 enters the recess 25 as the mold is closed, and pushes the foaming raw material g accumulated in the recess 25 toward the cavity C2 side of the tip portion 5b. The convex portion 35 is formed in a truncated pyramid shape as shown in FIG. 3 in accordance with the shape of the recess 25 that is recessed in a truncated pyramid shape. In particular, the side surface 36 that forms the surface on the other end side far from the hinge 4 in the mold closed state is inclined toward the base end of the convex portion 35 in accordance with the upward inclined surface of the side wall surface 26 that forms the recess 25. Face (FIG. 6).

As shown in FIG. 8, the side seat pad 5 forms a tip portion 5b whose tip is upwardly inclined with respect to the main body portion 5a arranged substantially horizontally. In accordance with the shape of the side seat pad 5, the foaming mold 1 has the main mold surface 22 of the lower mold 2 that forms the design surface 51 side of the main body main section 5a arranged almost horizontally to form the tip portion 5b. The tip region mold surface 23 is an upward inclined mold surface 23 a that is provided with a recess 25 and extends.
When the mold is closed, the dimension of the gap ε1 between the side surface 36 on the other end side of the convex portion 35 that has entered the recess 25 and the side wall surface 26 on the other end side of the concave portion 25 facing this is determined by the hinge 4 of the convex portion 35. It is set to be smaller than the dimension of the gap ε2 between the side surface 37 on one end side close to the side and the side wall surface 27 on one end side of the recess 25 facing this (FIG. 7). The gap dimension value is the arithmetic average value. The gap size is about 2 to 10 mm. When the convex portion 35 enters the depression 25, the dimension of the gap ε1 is smaller than the dimension of the gap ε2, so that the liquid flow resistance becomes smaller on the gap ε2 side, and the foaming raw material g in the depression 25 becomes the hinge 4 as shown by the arrow in FIG. Is pushed out more effectively to the tip portion 5b closer to.

Further, as the upper mold 3 is closed, the recess 25 forms a surface on the other end side away from the hinge 4 in the side wall surface 26 that forms a surface on the other end side away from the hinge 4. The convex portion 35 enters toward the concave bottom 25b so that the side surface 36 is blurred. As shown in FIGS. 6 (a) to 6 (c), the side surface 36 of the convex portion 35 far from the hinge 4 and the side wall surface 26 of the recess 25 far from the hinge 4 smolder the side wall surface 26. The mold closing of the upper mold 3 proceeds. The foaming raw material g accumulated in the depression 25 is shaped so that it is almost closed while being pushed out toward the main mold surface 22 when the mold is closed, and is smoothly extruded toward the tip region die surface 23 where the foaming raw material g is required. It becomes a foam type structure.
Further, as shown in FIG. 7, when the mold closing is completed, the gap between the side surface 36 on the other end side of the convex portion 35 that has entered the recess 25 and the side wall surface 26 on the other end side of the recess 25 facing this narrows. It is more preferable that a part is set so as to at least contact T. With the seat pad 5 that has been subjected to foam molding, the bar BR that closes the opening 50 is cut into a slit shape by the corresponding contact T. This is because the burr BR can be easily removed using a slit-like cut. In the seat pad 5 that has been molded, when the gap is narrowed as shown in FIG. Even more preferable. This is because a burr mark is formed on the lower edge 50b of the opening on the back surface 52 side of the seat pad and is not noticeable.

Using such a foaming mold 1, the seat pad 5 is manufactured as follows, for example.
First, the foaming mold 1 is in the mold open state (FIG. 4). Under this mold open state, the foaming raw material g is injected into the lower mold surface 21 in a required amount. Even if the foaming raw material g is poured near the center of the lower mold surface 21, the foaming raw material g flows on the main mold surface 22 and flows into the recess 25 as shown in FIG. In this way, the foaming raw material g is stored in the recess 25.

  Next, the upper mold 3 is rotated around the hinge 4 to close the mold. As described above, the mold surface portion of the lower mold 2 corresponding to the opening 50 has the depression 25, and the upper mold 3 is formed with the projection 35 that enters the depression 25 when the mold is closed. Accordingly, as the mold is closed, the convex portion 35 enters the recess 25, and the foaming raw material g accumulated in the recess 25 overflows. When the convex portion 35 enters the recess 25, the foaming raw material g accumulated in the recess 25 loses the escape place and overflows, and moves toward the cavity C2 side of the tip portion 5b.

  Here, in the foaming mold 1, the side surface 36 of the convex portion 35 that forms the surface on the other end side away from the hinge 4, that is, the side surface on the other end side of the convex portion 35 that has entered the recess 25, when the mold is closed. A gap ε1 is provided between 36 and the side wall surface 26 on the other end side of the recess 25 facing this (FIG. 7). The dimension of the gap ε1 is set to be smaller than the dimension of the gap ε2 between the side surface 37 on the one end side near the hinge 4 side of the convex portion 35 and the side wall surface 27 on the one end side of the recess 25 facing this. The dimension of the gap ε1 is narrowed to increase the liquid flow resistance flowing through the gap ε1, thereby making it difficult for the foaming raw material g to flow to the main body cavity C1 side. Therefore, the foaming raw material g overflowing from the depression 25 is effectively pushed out to the cavity C2 side of the tip portion 5b. The foaming raw material g is smoothly extruded to the tip portion cavity C2 side.

Further, the recess 25 has a side wall surface 26 which is a surface on the other end side far from the hinge 4 as an upward inclined surface inclined outward from the recess bottom 25b toward the upper surface opening 25u. As the upper mold 3 is closed, as shown in FIG. 6, the depression 25 is formed on the side wall surface 26 that forms the surface on the other end side away from the hinge 4. The convex portion 35 enters the concave bottom 25b so that the side surface 36 that forms the surface is grazed. Therefore, the extrusion transfer of the foaming raw material g toward the cavity C2 side of the tip portion 5b proceeds more smoothly as the mold closing proceeds.
Specifically, in FIG. 6 (a), after the foaming raw material g is accumulated in the recess 25, the hinge of the convex portion 35 is formed on the side wall surface 26 on the other end side away from the hinge 4 of the recess 25 as shown in FIG. 6 (b). The convex portion 35 enters the recess 25 so that the side surface 36 on the other end side away from 4 is blurred (or rubbed). Therefore, when the foaming raw material g in the depression 25 overflows, it is prevented from moving toward the main mold surface 22. When the convex portion 35 enters the recess 25 as described above, the foaming raw material g accumulated in the recess 25 is smoothly pushed out toward the tip region mold surface 23 aimed by the present invention.

  In particular, it is a side seat pad 5 having a tip portion 5b that rises and inclines as shown in FIG. 8 with respect to the main body portion 5a in a horizontal state, and a tip region die surface 23 is formed on a main die surface 22 arranged substantially horizontally. On the other hand, when it becomes the upward inclined type | mold surface 23a which faces upwards at the front end side, it becomes very effective. As the mold is closed, the process proceeds from FIG. 6 (a) to (c). When the mold closing is completed, the foaming raw material g pushed out from the depression 25 is inclined upward even if the foam raw material g is against gravity. As shown in FIG. 5, a necessary amount of the foaming raw material g can flow into the tip portion cavity C2.

After completion of mold closing in FIG. 5, the process proceeds to a foam molding process. 5 is maintained for a predetermined time, and the side seat pad 5 having the opening 50 shown in FIGS. 1 and 2 is foam-molded. In the mold closing process, the convex portion 35 enters the recess 25, and the foaming raw material g accumulated therein is pushed out to the cavity C2 side of the tip portion 5b. Is secured. Thus, even if the opening 50 as shown in FIGS. 1 and 8 is present, the desired quality-stable seat pad 5 in which the lacking portion K does not occur at the tip portion 5b is obtained.
1 and 2, reference numeral 54 is a base thickness portion, reference numeral 55 is a hog ring hanging groove for attaching a skin, reference numeral 56 is a long hole, reference numeral 57 is a rear wheel portion, and a recess for escaping this is shown. 3, reference numeral 32 is the upper die corresponding surface of the main mold surface 22, and reference numeral 33 is the tip area mold surface 23. The upper mold-corresponding surface, reference numerals 29 and 39 are the mold combining surfaces, and reference numeral g1 is the liquid surface of the foaming raw material g.

In the seat pad manufacturing method and the manufacturing foaming mold configured as described above, as the mold is closed, the convex portion 35 enters the recess 25, and the foaming raw material g accumulated in the recess 25 is moved to the cavity C2 side of the tip portion 5b. Since the structure is extruded, the required amount of the foaming raw material g can be easily and smoothly sent to the cavity C2 side of the tip portion 5b. In the invention of Patent Document 1 in which the foaming raw material g is passed through a through hole having a small cross-sectional area that forms a bypass portion that crosses the opening 50, the amount of the foaming raw material g required for the tip portion 5b is large, and the opening 50 In the case of the seat pad 5 as shown in FIG. Even if an external force for feeding the foaming raw material g is applied, it is difficult to feed the necessary amount to the tip portion 5b due to frictional resistance with the through-hole wall when the foaming raw material g is fed.
On the other hand, the present invention closes the mold and causes the foaming raw material g accumulated in the depression 25 to overflow by the convex portion 35 and push out to the cavity C2 side of the tip portion 5b. It is not necessary to consider the frictional resistance due to the through-hole walls. In addition, the convex portion 35 accompanying the mold closing enters the recess 25 and causes the foaming raw material g to overflow, since it is only necessary to use the mold closing force, so that no new external force is required. Since the convex portion 35 enters the recess 25 and smoothly feeds the necessary amount of the foaming raw material g into the tip portion cavity C2 by a series of movements that proceed to mold closing and at a necessary timing, an extremely useful seat pad manufacturing method And it is a foaming mold for its manufacture.

  And in the mold surface part which forms the opening part 50, since the convex part 35 enters into the hollow 25 by mold closing and both form a fitting part, the extra material loss of the foaming raw material g in the fitting part is minimized. Less. There is no three-dimensional bypass portion as in Patent Document 1, and such a material loss having a rod shape does not occur. Effective utilization rate of foaming raw material g is high.

Further, here, the main body portion 5a is formed by the main mold surface 22 of the lower mold 2, and further, the distal end portion 5b is formed by the distal end area mold surface 23 of the lower mold 2 which is provided with the depression 25 and extends. ing. An upper mold 3 that opens and closes with a hinge 4 provided on one end side of the lower mold 2 on the side where the distal end region mold surface 23 exists is attached. As the mold is closed, the side surface 36 of the convex portion 35 that forms the surface on the other end side farther from the hinge 4 smolders in the depression 25 on the side wall surface 26 that forms the surface on the other end side far from the hinge 4. Thus, when the convex portion 35 enters toward the recess bottom 25b, the necessary amount of the foaming raw material g present in the recess 25 can be more effectively pushed out to the tip portion cavity C2. When the foaming raw material g accumulated in the depression 25 is pushed out as the mold is closed, if the convex side face 36 on the other end side is squeezed into the depression side wall face 26 on the other end side, the foam raw material g is pushed out to the main body cavity C1 side. This is because the outlet of the foamed raw material g to be sealed is blocked.
And among the wall surfaces forming the recess 25, the side wall surface 26 which is the surface on the other end far from the hinge 4 is an upward inclined surface inclined outward from the recess bottom 25b toward the upper surface opening 25u. The convex side surface 36 on the other end side can be easily produced in a structure in which the concave side wall surface 26 is easily blurred.

Furthermore, the size of the gap ε1 between the side surface 36 on the other end side of the convex portion 35 that has entered the recess 25 and the side wall surface 26 on the other end side of the concave portion 25 facing this is set to the hinge 4 of the convex portion 35. If the dimension is set to be smaller than the dimension of the gap ε2 between the side surface 37 on the one end side close to the side and the side wall surface 27 on the one end side of the recess 25 facing this, the foaming raw material g overflowing from the recess 25 is more smoothly closed To the tip portion cavity C2. Since the liquid flow resistance is higher in the gap ε1 than in the gap ε2, the foaming raw material g creates a preferable state toward the tip portion cavity C2 that easily flows out.
In addition, with respect to the main mold surface 22 arranged almost horizontally, the tip region mold surface 23 is an upward inclined mold surface 23a with the tip side facing upward, and the tip end side faces upward with respect to the main body portion 5a disposed horizontally. Also in the foam molding of the portion 5b, the foaming raw material g pushed out from the depression 25 can be directed to the tip region mold surface 23 that rises and slopes against gravity by the progress of mold closing (FIG. 5). When the mold closing is completed, a necessary amount of the foaming raw material g can be moved from the inside of the recess 25 and stored in the tip portion cavity C2. The product quality is stable, and it is extremely effective for a shaped product such as the side seat pad 5 in which the lacking portion K is a problem.

Further, the portion of the opening 50 after foaming the seat pad 5 appears as a thin film-like BR BR formed by the fitting of the convex portion 35 and the recess 25, so that the BR can be removed relatively easily. . As in Patent Document 1, there is no difficulty in post-processing where the bypass parts must be cut one by one.
Further, when the mold is closed, the gap between the convex side surface 36 on the other end side that has entered the recess 25 and the recess side wall surface 26 on the other end side is narrowed, and when a part of the sheet abuts, the seat pad that has finished foam molding. Since a slit-like cut is made in the corresponding contact portion T of 5, the burr BR can be easily removed from the cut.
More specifically, when the mold is closed, the convex side surface 36 on the other end side and the hollow side wall surface 26 on the other end side come into contact with each other at the lower edge 50b of the opening on the back surface 52 side of the seat pad as shown in FIG. Since the burr marks formed by the cuts appear on the back surface 52 side of the seat pad, there is no problem in quality. Like patent document 1, it is also freed from the work burden which must cut a bypass part by post-processing, and also perform cutting processing after excision.
Thus, the manufacturing method of this seat pad and the foaming mold for manufacturing the same exhibit the numerous effects described above and have a great effect.

  The present invention is not limited to those shown in the above-described embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. The shape, size, number, material, etc. of the foaming mold 1, the lower mold 2, the upper mold 3, the recess 25, the convex portion 35, the seat pad 5, the main body main portion 5a, the tip portion 5b, etc. can be appropriately selected according to the application. . In the embodiment, the seat pad 5 is applied to the side seat pad, but the seat pad 5 can be applied to the seat cushion for the seat portion as well as the back pad.

1 Foaming mold 2 Lower mold 21 Lower mold surface (mold surface)
DESCRIPTION OF SYMBOLS 22 Main type | mold surface 23 Tip area | region type | mold surface 25 Depression 26 Side wall surface which forms the dent surface of the other end side far from a hinge 3 Upper mold | type 36 Side surface which forms the convex-part surface of the other end side far from a hinge 4 Hinge 5 Seat pad ( Side seat pad)
5a body main part 5b tip part 50 opening g foaming raw material C2 cavity for tip part ε1, ε2 gap

Claims (6)

In a method of manufacturing a seat pad with a tip portion extending beyond the opening provided near the one end from the main part of the main body, after the foam raw material is injected into the lower mold, the mold is closed, and then foam-molded.
On the lower mold surface portion corresponding to the opening, a recess having an upper surface opening corresponding to the opening is formed downward, while the upper mold has a protrusion that enters the recess by closing the mold. Forming,
After injecting the foaming raw material into the lower mold surface and storing the foaming raw material in the recess, when the mold is closed, the convex portion enters the recess, and the foaming raw material stored in the recess is transferred to the cavity side of the tip portion. A method of manufacturing a seat pad, characterized in that the sheet pad is extruded. The main body portion is formed by the main surface of the lower die, and the tip portion is formed by the tip region die surface of the lower die that extends by disposing the recess, and the tip region mold surface is present. An upper die that opens and closes with a hinge provided on one end side of the lower die as a fulcrum is attached, and a side wall surface that forms a surface on the other end side away from the hinge at the recess when the upper die is closed The method of manufacturing a seat pad according to claim 1, wherein, among the convex portions, the convex portions enter toward the bottom of the dent so that the side surface forming the surface on the other end side that is far from the hinges is grazed. The tip area mold surface is an upwardly inclined mold surface with the tip side facing upward, with respect to the main mold surface arranged substantially horizontally, and the tip portion with the tip side facing upward with respect to the horizontally disposed main body portion is formed. The seat pad manufacturing method according to claim 2, wherein an upper mold that opens and closes with a hinge provided on one end side of the lower mold having the upward inclined mold surface as a fulcrum is attached. The recess has an upper inclined surface in which the side wall surface that is far from the hinge and is on the other end side is inclined outward from the bottom of the recess toward the upper surface opening port, and enters the recess when the mold is closed. The dimension of the gap between the side surface on the other end side of the convex portion and the side wall surface on the other end side of the recess facing the convex portion is set to the size of the side surface on the one end side near the hinge side of the convex portion and the recess facing the concave portion. The manufacturing method of the seat pad of Claim 2 or 3 set smaller than the dimension of the clearance gap with the side wall surface of the one end side. The mold is closed, and the gap between the side surface on the other end side of the convex portion that has entered the recess and the side wall surface on the other end side of the recess opposite to the narrow portion is narrowed, and at least a part thereof is in contact. The manufacturing method of the seat pad of any one of 2 thru | or 4. In the foam mold for manufacturing the seat pad with the tip portion extending beyond the opening provided near the one end from the main body,
The lower mold surface has a main mold surface that forms the main body, and the lower mold surface portion corresponding to the opening has an upper surface opening having a size corresponding to the opening and faces downward. And a tip region mold surface for the tip portion extending from the main mold surface through the recess, and the upper mold is provided with a convex portion that enters the recess when the mold is closed. Being
A foaming mold for manufacturing a seat pad, wherein the convex portion enters into the depression as the mold is closed, and the foaming material accumulated in the depression is pushed out to the cavity side of the tip portion.

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