JP6894675B2 - Manufacturing method of seat members - Google Patents

Description

The present invention relates to a method for manufacturing a seat member, and more specifically, an insert member provided with an air distribution groove that functions as a duct for circulating temperature-controlled air inside, and a foamed soft member that functions as a cushion. The present invention relates to a method of producing a seat member that can be foam-molded to supply temperature-controlled air to a user.

For example, an air conditioner (hereinafter referred to as an air conditioner) installed in a vehicle such as a passenger car provides a comfortable temperature environment (cooling and heating) to the occupants by adjusting the temperature inside the vehicle with respect to the outside air temperature. .. The air outlets (louvers) for cold air and hot air in this air conditioner are generally provided on the instrument panel, and the occupants indirectly experience the cooling temperature and the heating temperature.

However, depending on the high-class vehicle type, the temperature-controlled air is blown out from the seating surface or the backrest surface of the seat member so that the seated person can directly feel the cooling (or heating) temperature. For example, FIGS. 2 and 3 of JP-A-2005-95343 disclose an air-conditioning sheet in which a molded body 6 having an air distribution passage 41 is embedded in a cushion pad main body 5. It should be noted that there is also a seat member that gives a feeling of coolness to the seated person by sucking the air into the seat instead of blowing out the temperature-controlled air described above from the seat. Further, the seat member referred to in the present specification refers to either a seat cushion serving as a seating portion and a seat back serving as a backrest portion, or both a seating portion and a backrest portion.

Japanese Unexamined Patent Publication No. 2005-95343

The seat member (so-called air-conditioning seat) having the function of blowing (or sucking) the temperature-controlled air to the seating part or the backrest part described above blows the temperature-controlled air sent from the air conditioner to the seating surface or the back of the seating part. It is necessary to provide a duct for guiding to the leaning surface inside the seat member. As disclosed in paragraph [0023] of JP-A-2005-95343, this duct is formed by forming an elastically deformable resin sheet into a bag-shaped molded body 6 by a blow molding method or the like, and has an air distribution passage inside. 41 is provided. However, the duct provided as a separate body needs to have rigidity so as not to be deformed even when the seated person's weight or weight shift is received, and the weight of the seat member into which the duct is incorporated inevitably increases. Therefore, recently, instead of incorporating a duct molded as a separate body, a groove for ventilation that fulfills the so-called duct function is integrally foamed on the seat cushion, and the ventilation groove is covered with a separate member. , Seat members that are designed to reduce weight and cost are becoming widespread.

For example, FIG. 13 is a perspective view showing a sheet body 11 made of a foamed soft member made of polyurethane or the like as a raw material in a cross-sectional view from the design surface side, and FIG. 10 is a cross-sectional view taken along the line AA of FIG. A duct groove 13 for passing temperature-controlled air is integrally foam-molded inside the sheet body 11, and the back side of the duct groove 13 is covered with a back surface material (cover body) 15. Further, in FIG. 11, when the seat body 11 is foam-molded, a large air distribution groove (duct groove) 13 is formed on the back side of the sheet body 11, and a discharge hole 17 that opens on the seating surface side is formed in the air distribution groove. It communicates with 13. Also in this case, the portion of the air distribution groove 13 that opens to the back side is covered with a back surface material 15 such as felt. Further, in FIG. 12, the air distribution groove 13 is integrally molded inside the seat body 11, and the air distribution groove 13 is covered with a back surface material 15 made of a foamed soft member or a slab on the seating surface side. .. In this case, the back surface material 15 is provided with a discharge hole 17 that communicates with the air distribution groove 13, so that the temperature-controlled air is blown out from the discharge hole 17 to the seating surface side.

By the way, in order to reduce the weight and cost of the seat member, an attempt has been made to reduce the wall thickness of the foamed soft member such as urethane foam as much as possible while ensuring various performances required for the seat. In this case, an insert member that functions as a raising material for the seat member is used, and the seat member is manufactured by integrally molding the insert member and the foamed soft member. As the insert member (raising material), a foamed hard member such as expanded polypropylene (EPP), expanded polystyrene (EPS), or a composite resin in which polystyrene and polyolefin are blended is selectively used, and the expanded soft member and gold are used. The seat member is obtained by being integrally foamed in the mold. However, if the air distribution groove as described in FIGS. 10 to 12 is integrally foam-molded on the seat cushion, the foamed soft member forming the cushion portion cannot be thinned to reduce the weight of the seat cushion.

In view of the above-mentioned difficulties, the applicant of the present application devised a seat member functioning as a ventilation sheet having the structure shown in FIG. 8, and filed a separate patent application for this. The seat member will be briefly described with reference to FIGS. 8 and 9. The foamed hard member 14 as the insert member in the seat member 10 is formed with a passage 18 as an air distribution groove, and the seat member The weight of the user added to the 10 is mainly received by the insert member 14. Further, the seat member 10 is formed by integrally foaming the insert member 14 so as to be wrapped from above by a foamed soft member 12 such as urethane foam. Then, the first through hole 20 formed in the foamed hard member 14 as the insert member is connected to the air supply port (not shown) of the air conditioner that sends out the air conditioning air described above, and the air conditioning air is the first. It is supplied to the passage 18 through one through hole 20. Further, on the side of the insert member 14 facing the seating surface, an appropriate number of second through holes 22 communicating with the first through holes 20 are provided. Then, when the foamed soft member 12 is foam-molded in a mold described later, an appropriate number of third through holes 24 are formed in the foamed soft member 12 at the same time, and the third through holes 24 are formed into the second through holes 24. It is designed to communicate with the through hole 22 in a corresponding manner. Therefore, the temperature-controlled air sent out from the air conditioner flows into the passage 18 defined in the insert member 14 through the first through hole 20, and the second through hole 22 and the third through hole 24, respectively. It is sent out to the side of the seating surface of the seat member 10 via. As shown in FIG. 8, since the seating surface of the seat member 10 is covered with the breathable skin material 23, the temperature-controlled air blown out from the third through hole 24 of the foamed soft member 12 is , Contact the seated person through the ventilation holes of the skin material 23. As the skin material 23, for example, a breathable woven fabric, a three-dimensional woven fabric, a three-dimensional knitted fabric, a non-woven fabric, or the like is used. A breathable pad is laminated on the back surface of the skin material 23 as a backing material to form a trim cover that covers the seat cushion.

Here, the foamed hard member 14 as the insert member is a bead foamed molded product. Specifically, it may be expanded polypropylene (EPP) or expanded polystyrene (EPS), or a composite resin in which polystyrene and polyolefin are blended. The expanded polypropylene (EPP) has a trade name: Eperan-PP manufactured by Kaneka Corporation. Further, expanded polystyrene (EPS) is commercially available under the trade name of Kaneka Corporation: Kanepal, and expanded polyethylene is commercially available under the trade name of Kaneka Corporation: Eperan. Examples of the composite resin include foamed polyethylene copolymerized polystyrene resin (trade name: Pioceran manufactured by Sekisui Plastics Co., Ltd.).
Further, it is recommended that the foamed soft member 12 uses foamed polyurethane which is foam-molded integrally with the insert member 14.

In this way, in order to reduce the weight and cost of the seat member in which the insert member is integrally molded with the foamed soft member, the weight of the user is increased by providing the insert member with an air distribution groove connected to the air conditioner. A seat member as a ventilation sheet that does not easily deform even when received is obtained. The present invention provides a method for manufacturing a seat member in which the air distribution groove is formed in the insert member and integrally molded with the foamed soft member.

The invention according to claim 1 for solving the above-mentioned problems and achieving the intended object.
A passage for temperature-controlled air was formed inside by stacking other foamed hard members so as to block the open portion of the passage as an air distribution groove provided to open on one side of the foamed hard member. forming a Inserts member, the through hole being so disposed that opens to the side opposite to the overlapping surface of each foam rigid members, the state of being communicated with the passage of the temperature-controlled air, which is formed by closing the opening And the process to do
The insert member is set in the upper mold in a posture toward the cavity of the upper mold of the mold in which the first through hole as the through hole of one foam hard member is opened, and the through of the other foam hard member. The process of directing the second through hole as a hole to the cavity of the lower mold that forms the seating surface side, and
A closing member provided in the lower die cavity so as to project corresponding to the number of the second through holes is being opened under a state in which the corresponding second through holes can be closed when the upper and lower molds are closed. The process of supplying the raw material of the foamed soft member to the lower mold and
By foaming the raw material in a state where the insert member is separated from the cavity of the lower mold that forms the seating surface side in the state where the upper mold and the lower mold are closed, the second through hole in the insert member is formed. Is integrally molded with the insert member and the foamed soft member having a portion having a different wall thickness under the state of being closed by the closing member, and the seating surface side of the insert member located at the portion where the wall thickness is thinly formed. It is equipped with a process of forming a foamed soft member.
It is a gist that a third through hole communicating with the second through hole of the insert member is formed in the foamed soft member in accordance with the demolding.
According to the invention of claim 1, the passage formed inside and through which the temperature-controlled air flows, the first through hole communicating with the passage and opening to one side, and the other side where the foamed soft member foams. An insert member having a second through hole that opens in the mold and communicates with the insert member, and a third passage that communicates with the second passage when foamed in the mold and integrated with the insert member. A seat member made of a foamed soft member formed at the same time can be easily manufactured.

In the invention according to claim 2, when the outer circumference of the closing member coincides with the inner circumference of the third through hole to be formed in the foamed soft member, and the top of the closing member closes the upper and lower molds. The gist is that the area is set so that the second through hole formed in the insert member can be closed.
According to the second aspect of the present invention, when the mold is closed to foam the raw material of the foamed soft member, the top of the closing member completely closes and seals the second through hole of the insert member. The raw material at the time of foaming does not invade the second through hole. Further, since foaming is defined in the region where the closing member exists, when the seat member is removed from the mold, a third through hole is formed in the foamed soft member as a trace of the closing member. There is.

In the invention according to claim 3, a tapered protrusion is provided on the top of the closing member, and when the upper and lower molds are closed , the top of the closing member closes the second through hole. , projecting portion is summarized in that adapted to be inserted into the second hole.
According to the third aspect of the present invention, when the mold is closed, the protruding portion provided at the top of the closing member is inserted into the second through hole of the insert member to guide the second through hole. Since it is inserted by crimping, the top of the closing member can completely close the second through hole.

The gist of the invention according to claim 4 is that the closing member provided in the lower die cavity is a mixture of a member having the protruding portion at the top thereof and a member having no protruding portion. To do.
According to the invention of claim 4, the second through hole for which it is preferable to have a guide by the protruding portion of the closing member and the second through hole which does not require such a guide are used in a correspondingly mixed manner. Can be done.

According to the present invention, the passage formed inside and through which the temperature-controlled air flows, the first through hole communicating with the passage and opening on one side, and the opening on the other side in contact with the foamed soft member. Foaming in which an insert member having a second through hole communicating with the passage and a third passage communicating with the second passage are formed at the same time when the insert member is foamed in the mold and integrated with the insert member. A seat member made of a soft member can be easily manufactured.

It is a cross-sectional view of an insert member provided inside a seat member, in which a passage as an air distribution groove is provided in the center, and a first through hole and a second through hole communicating with the passage are opened on opposite sides, respectively. Shows the state of It is a cross-sectional side view which shows the 1st half body and the 2nd half body which make up the insert member shown in FIG. 1 in a separated state. It is a cross-sectional view of the mold used in the manufacturing method of the seat member which concerns on this invention, and is shown in the state which the upper mold is opened. FIG. 3 is a cross-sectional view of the mold shown in FIG. 3, showing a state in which the upper mold is being closed toward the lower mold. FIG. 3 is a cross-sectional view of the mold shown in FIG. 3, showing a state in which the upper mold is closed with respect to the lower mold. It is an enlarged cross-sectional view schematically showing the relationship between the closing member protruding from the lower mold and the second through hole of the insert member set in the cavity of the upper mold, and FIG. 4A is a reference numeral A in FIG. It is an enlargement of the circular portion shown, and shows a state in which the second through hole of the insert member is approaching toward the protruding portion provided at the top of the closing member as the upper die is closed. (B) is an enlargement of the circular portion indicated by reference numeral B in FIG. 5, in which the mold is closed and the top of the closing member closes the second through hole of the insert member, and the protruding portion is the second. It shows the state of being inserted into the through hole. It is an enlarged cross-sectional view which shows roughly the relationship between the closing member protruding from the lower die and the second through hole of the insert member set in the cavity of the upper die, and (a) is the second through of the insert member. The hole shows a state in which the hole is approaching toward the top of the closing member as the upper mold is closed, and in (b), the mold is closed and the top of the closing member closes the second through hole of the insert member. It shows the state of doing. It is a partial cross-sectional view of the seat member manufactured by the manufacturing method which concerns on this invention. It is a partial cross-sectional view which shows the seat member shown in FIG. 8 in a separated state for each member. FIG. 13 is a schematic cross-sectional view of a cushion sheet according to a conventional technique in which an air distribution groove is integrally foam-molded, which is cut along the line AA. It is a schematic cross-sectional view of a conventional cushion sheet in which an air distribution groove is integrally formed on the back side and the air distribution groove is covered with a lid material from the back side. It is a schematic cross-sectional view of a conventional cushion sheet in which an air distribution groove is integrally formed on the front side and the air distribution groove is covered with a lid material from the front side. It is a perspective view which shows the design surface of the seat member which concerns on embodiment of this invention in the cross section.

Next, an embodiment of the method for manufacturing a seat member according to the present invention will be described with reference to the drawings. As described above, the seat member manufactured by the manufacturing method according to the embodiment of the present invention secures rigidity while forming a passage as an air distribution groove in the foamed hard member as an insert member. It is obtained by integrally foam-molding a foamed soft member serving as a seat cushion on the insert member.

In order to manufacture the seat member 10 shown in FIG. 8, the insert member 14 shown in FIGS. 1 and 2 is manufactured in advance using another mold (not shown), and the insert member 14 is shown in FIG. After setting in the upper mold 30 of the mold 35 shown in 3, the insert member 14 is formed by the foamed soft member 12 by foaming the raw material U of the foamed soft member 12 in the mold 35 as shown in FIG. The seat member 10 integrally wrapped is obtained. Therefore, the process of manufacturing the seat member 10 will be described step by step below.

FIG. 1 shows a cross section of an insert member 14 that forms a part of the seat member 10, and the aisle 18, the first through hole 20, and the second through hole 22 are formed inside the insert member 14. Has been done. Further, FIG. 2 shows the insert member 14 shown in FIG. 1 in a separated state as two halves divided into upper and lower parts.

That is, as shown in FIG. 2, the insert member 14 is composed of a divided body of the lower first half body 26 and the upper second half body 28. The first half body 26 constituting one of the insert members 14 is formed with the first through hole 20 at an appropriate position, and the first through hole 20 is an outlet for the temperature-controlled air of the air conditioner. (Not shown) is connected. Further, when the passage 18 as the air distribution groove described above is formed in the second half body 28 constituting the other side of the insert member 14 with a required length and is combined with the first half body 26. In addition, the passage 18 is designed to be closed. The first through hole 20 formed in the first half body 26 is formed when the first half body 26 is superposed on the second half body 28 and the open portion of the passage 18 is closed. The position is set in advance so that they can communicate with each other. Further, an appropriate number of the second through holes 22 are formed on the upper surface of the second half body 28 (the surface on the side not blocked by the first half body 26), and each of the second through holes 22 is the passage. It communicates with 18. Therefore, in the insert member 14 after the first half body 26 and the second half body 28 are united, the passage 18 is defined inside the insert member 14, and the lower surface of the insert member 14 in FIG. The first through hole 20 is opened in the above, and the second through hole 22 is opened on the upper surface.

That is, the first through hole that communicates with the passage 18 through which the temperature-controlled air flows and the passage 18 and opens on the opposite side (first half body 26 and second half body 28) of the insert member 14. The 20 and the second through hole 22 are foam-molded as the first half body 26 and the second half body 28 shown in FIG. 2 in each of the different molds (not shown). Then, the insert member 14 is obtained by stacking the first half body 26 and the second half body 28 formed by each mold up and down as shown in FIG. In FIG. 2, the passage 18 extends downward from the second through hole 22 on the lower bottom surface of the second half body 28. Therefore, as shown in FIG. 1, by covering the lower bottom surface of the second half body 28 with the first half body 26, the open portion of the passage 18 is closed by the first half body 26 to complete the passage. become. In this case, it goes without saying that the first through hole 20 opened in the first half body 26 is positioned so as to communicate with the passage 18 of the second half body 28.

Then, as shown in FIGS. 8 and 9, the foamed soft member 12 integrally foam-molded with the insert member 14 has a third contact with the second through hole 22 formed in the insert member 14. A through hole 24 is formed. Therefore, a large number of the third through holes 24 are present on the seating surface of the seat member 10 manufactured by integrally foam molding the insert member 14 and the foamed soft member 12. Then, since the seat member 10 is covered with the breathable skin material 23, the seated person is supplied with the temperature-controlled air from the air conditioner.

As described above with reference to FIGS. 1 and 2, the passage 18 through which the temperature-controlled air flows inside the insert member 14 in which the first half body 26 and the second half body 28 are united. The first through hole 20 and the second through hole 22 that communicate with the passage 18 and open in opposite directions are formed. Therefore, in order to manufacture the seat member 10, the foamed soft member 12 obtained by foaming the raw material U of the foamed soft member 12 into the insert member 14 communicates with the second through hole 22. The third through hole 24 (see FIG. 8) needs to be formed at the same time. Moreover, since the insert member 14 is provided with a plurality of the second through holes 22, the raw material U in the middle of foaming becomes the second through holes 22 in the process of foaming the raw material U of the foamed soft member 12. It is necessary to prevent intrusion.

Therefore, in the manufacturing method of the embodiment of the present invention, the mold 35 shown in FIGS. 3 to 7 is used. 3 to 5 are cross-sectional views showing a mold 35 composed of a lower mold 34 and an upper mold 30, and the upper mold 30 can be tilted and opened and closed obliquely with respect to the lower mold 34 via a hinge portion 29. It is pivotally supported. Since the mold 35 foams the raw material U of the foamed soft member 12 in the cavity in a temperature-controlled environment, the lower mold 34 and the upper mold 30 are not shown, but a heating heater is built in the lower mold 34 and the upper mold 30. When the mold is closed, a locking device is provided to tighten and fix the upper and lower molds 34 and 30 in order to resist the foaming internal pressure of the foamed soft member 12 in the cavity. Further, the cavity 36 formed inside the lower mold 34 and the cavity 32 formed inside the upper mold 30 have a concavo-convex shape that defines the outer shape of the seat member 10 finally manufactured by the mold 35. ing. In FIG. 3, the raw material U of the foamed soft member 12 may be injected with the upper and lower molds 30 and 34 open, or may be separately injected into the upper mold 30 with the upper and lower molds 30 and 34 closed. You may inject using the provided injection hole (not shown).

Then, in FIG. 3, the insert member 14 (FIG. 2) that has been molded in the separate step is set in the cavity 32 of the upper mold 30. At this time, the set posture of the insert member 14 is such that the first through hole 20 provided in the insert member 14 shown in FIG. 1 is directed toward the cavity 32 side of the upper mold 30 and is provided in the insert member 14. The second through hole 22 is directed to the cavity 36 of the lower mold 34 which is correspondingly opened. The surface on which the insert member 14 is set in the cavity 32 of the upper mold 30 is drawn flat in FIGS. 3 and 1, but in reality, the set surface of the insert member 14 is the pipe frame of the seat. Since it is rich in undulations due to unevenness for accommodating various members such as the above, the cavity 32 of the upper mold 30 is also provided with unevenness corresponding to the unevenness. Therefore, even when the insert member 14 is set in the cavity 32 of the upper mold 30, positioning is performed by fitting the unevennesses together, and the insert member 14 is prevented from easily falling off.

Further, the cavity 36 of the lower mold 34 is provided with a number of closing members 38 corresponding to the second through hole 22 of the insert member 14 set in the cavity 32 of the upper mold 30 so as to project upward. .. That is, the number and position of the closing member 38 projecting into the cavity 36 of the lower mold 34 are determined when the upper mold 30 is closed toward the lower mold 34, as shown in FIGS. 4 and 5. In addition, the required number of the second through holes 22 in the insert member 14 set in the cavity 32 of the upper mold 30 are set in a positional relationship so as to be closed by the closing member 38.

The outer circumference (outer contour shape) of the closing member 38 is formed in the third through hole 24 formed in the foamed soft member 12 when the foam molding of the seat member 10 in the mold 35 is completed and the mold is removed. The dimensions are set to match the inner circumference (internal contour shape). Further, the closing member 38 includes one having a protruding portion 40 at the top as shown in FIG. 6 and one having no protruding portion 40 at the top as shown in FIG. 7, and if necessary. In some cases, it may be projected in either of the two styles, or in some cases, both styles may be projected in a mixed manner. In any style of the closing member 38, the top 38a of the closing member 38 is flat, and when the upper mold 30 is closed toward the lower mold 34 as shown in FIG. The area is set so that the opening of the second through hole 22 formed in the insert member 14 can be completely closed.

The closing member 38 shown in FIGS. 7A and 7B is formed as a flat surface on which nothing is formed on the top 38a. However, the closing member 38 shown in FIGS. 6A and 6B is provided with a tapered protrusion 40 coaxially with the closing member 38 on the top 38a of the closing member 38. As shown in FIG. 6B, the protruding portion 40 is crimped to the corresponding second through hole 22 formed in the insert member 14 when the upper and lower molds 34 and 30 of the mold 35 are closed. It is set to the dimension to be inserted. In the closing member 38 shown in FIG. 6, the top portion 38a is present on the outer periphery of the protruding portion 40, and as shown in FIG. 6B, the upper and lower molds 34 and 30 are closed. It goes without saying that sometimes the top 38a of the closing member 38 completely closes each corresponding second through hole 22 in the insert member 14, and the protruding portion 40 is inserted into the second through hole 22. ..

In order to manufacture the seat member 10 using the mold 35 shown in FIGS. 3 to 5, the insert member 14 is set in the cavity 32 of the upper mold 30 shown in FIG. 3 in the posture described above. Further, the raw material U of the foamed soft member 12 is supplied in a required amount to the cavity 36 of the lower mold 34 in the open state. Then, as shown in FIG. 4, when the upper mold 30 is closed, the second through hole 22 provided in the insert member 14 is provided with the corresponding closing member 38 projecting into the cavity 36 of the lower mold 34. Approach. Finally, when the mold 35 is closed as shown in FIG. 5, as shown in FIG. 6B, the top 38a of the closing member 38 opens the corresponding second through hole 22 of the insert member 14. Seal and block. Therefore, even if the raw material U of the foamed soft member 12 foams in the mold 35, a part of the raw material U does not invade the inside of the second through hole 22. Further, as shown in FIGS. 6A and 6B, the protruding portion 40 provided on the top 38a of the closing member 38 goes ahead to the second through hole 22 as the upper mold 30 is closed. It plays a role of invading and guiding. In addition, in FIGS. 7A and 7B, since the protruding portion 40 is not formed on the top portion 38a of the closing member 38, the top portion 38a seals and closes the opening of the second through hole 22. Only play a role.

The seat member 10 shown in FIG. 8 is formed by passing a certain cure time in the closed mold 35 shown in FIG. 5 (however, the skin material 23 is not provided). Next, when the upper mold 30 is opened and the seat member 10 is taken out from the lower mold 34, the foamed soft member 12 forming a part of the seat member 10 has an outer contour of the closing member 38. The third through hole 24 having a similar internal contour is formed. That is, it can be said that the third through hole 24 is a trace of the closing member 38 being pulled out. Since the third through hole 24 communicates with the second through hole 22 formed in advance in the insert member 14, the temperature-controlled air supplied through the first through hole 20 and the passage 18 can be used. , Is supplied to the seating surface of the seat member 10 through the second through hole 22 and the third through hole 24.

10 Seat member, 12 Foam soft member, 14 Insert member (foam hard member),
18 passage, 20 1st through hole, 22 2nd through hole, 24 3rd through hole, 30 upper mold,
32 Cavity, 34 Lower Die, 36 Cavity, 38 Closure Member,
38a top, 40 protrusions

Claims (4)

A passage for temperature-controlled air was formed inside by stacking other foamed hard members so as to block the open portion of the passage as an air distribution groove provided to open on one side of the foamed hard member. forming a Inserts member, the through hole being so disposed that opens to the side opposite to the overlapping surface of each foam rigid members, the state of being communicated with the passage of the temperature-controlled air, which is formed by closing the opening And the process to do
The insert member is set in the upper mold in a posture toward the cavity of the upper mold of the mold in which the first through hole as the through hole of one foam hard member is opened, and the through of the other foam hard member. The process of directing the second through hole as a hole to the cavity of the lower mold that forms the seating surface side, and
A closing member provided in the lower die cavity so as to project corresponding to the number of the second through holes is being opened under a state in which the corresponding second through holes can be closed when the upper and lower molds are closed. The process of supplying the raw material of the foamed soft member to the lower mold and
By foaming the raw material in a state where the insert member is separated from the cavity of the lower mold that forms the seating surface side in the state where the upper mold and the lower mold are closed, the second through hole in the insert member is formed. Is integrally molded with the insert member and the foamed soft member having a portion having a different wall thickness under the state of being closed by the closing member, and the seating surface side of the insert member located at the portion where the wall thickness is thinly formed. It is equipped with a process of forming a foamed soft member.
A method for manufacturing a seat member, characterized in that a third through hole communicating with the second through hole of the insert member is formed in the foamed soft member in accordance with the demolding. .. Together with the outer periphery of the closing member corresponds to the inner circumference of the front Symbol third through hole, when the top portion of the closure member which closes the upper and lower molds, the second hole formed in the insert member The method for manufacturing a seat member according to claim 1, wherein the area that can be closed is set. Wherein the top portion of the closure member is provided with protrusions tapered, upon closing said upper and lower molds, with closing the second hole in the top of the closure member, protruding portion is the second copies method of manufacturing a seat member according to claim 1 or 2, wherein is adapted to be inserted into the hole. The method for manufacturing a seat member according to claim 3, wherein the closing member provided in the lower die cavity is a mixture of a member having the protruding portion at the top thereof and a member having no protruding portion.

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