JP2007007897A - Manufacturing method of cushioning body and backing material for cushioning body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a cushioning body for allowing a backing material to well follow the shape of the uneven part on the back side of foam to fix the same to the back of the foam, and the backing material for the cushioning body. <P>SOLUTION: The cloth like backing material 3 is fixed to the back of the foam and the uneven part is formed to the back of the foam to manufacture the cushioning body. The backing material 3 equipped with a displaceable part 32A and a connection part 33 by providing a plurality of slits 31 to the backing material 3 is prepared. The backing material 3 is arranged to an upper mold 5 and a foamable resin raw material 20 is injected in a lower mold 6. The sagging of the displaceable part 32A is prevented by the connection part 33 formed to the backing material 3 to form a molding cavity 7 by the upper and lower molds 5 and 6. The foamable resin raw material 20 is foamed and allowed to flow in the molding cavity 7 to mold the foam and the displaceable part 32A is allowed to follow the molding protruded part 51 of the upper mold 5 by the foaming flow of the foamable resin raw material 20 to fix the backing material 3 to the foam. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cushion body manufacturing method and a cushion body backing material obtained by fixing a cloth-like backing material to the back side of a foam.

  As a cushion body formed by adhering a cloth-like backing material to the back side of the foam, for example, a cushion body used for a sheet of a vehicle, an aircraft, a ship, furniture, or the like can be given. Here, the backing material is used for improving the strength of the foam surface. In addition, by using the backing material, the seat frame used when attaching the cushion body to the body to be attached and the foam are prevented from coming into direct contact, and the foam is prevented from being worn or torn. is doing.

As literature which shows the above cushion bodies and its manufacturing method, there exists the following patent documents 1, for example. In order to perform positioning and the like with respect to the seat frame, the cushion body of Patent Document 1 is formed with an uneven shape (three-dimensional shape) on the back surface, and a backing material is integrally attached to the uneven shape. And in order to stick a backing material along an uneven | corrugated shape, the slit or notch is formed in the backing material.
However, in Patent Document 1, only a simple slit or notch is formed in the backing material, and it is not sufficient to cause the backing material to follow the shape of the uneven portion on the back side of the foam well. .

JP-A-5-309670

In order to make the backing agent follow better, as a reference example, for example, it is conceivable to use a backing material 93 formed with slits 931 and opening holes 932 as shown in FIG.
However, when the upper die 95 on which the backing material 93 on which the slits 931 and the opening holes 932 are formed is closed, as shown in FIG. 8 as a reference example, the portion where the slits 931 and the opening holes 932 are formed and the surrounding area are gravity. It hangs downward in the direction and opens. The foamed raw material 920 may enter between the backing material 93 and the upper die 95 through the slit 931 and the opening hole 932.
For this reason, the cushion body molded in this state does not have a proper backing material in the frame contact portion on the back surface, and there is a possibility that desired strength cannot be obtained in the frame contact portion.

  The present invention has been made in view of such conventional problems, and a cushion body manufacturing method and a cushion body capable of satisfactorily following a backing material to adhere to the shape of an uneven portion on the back surface side of a foam. It is intended to provide a backing material.

1st invention uses the lower mold | type which shape | molds the surface side of a foam, and the upper mold | type which can be opened and closed with respect to this lower mold | type, and shape | molds the back surface side of the said foam, and has an uneven | corrugated | grooved part on the back surface side. A method of manufacturing a cushion body made of the above-mentioned foam, in which a cloth-like backing material is integrally fixed to follow the uneven portion,
A displaceable portion that is displaceable in a direction crossing the surface of the backing material is formed by a slit provided in the vicinity of a portion corresponding to the concave portion in the concave-convex portion of the foam, and the displaceable portion is A preparation step of preparing a backing material having a connecting portion connected to the other part of the backing material;
An arrangement step of disposing the backing material on the upper mold in a state where the upper mold is opened, and causing the displaceable portion to face a mold convex portion formed on the upper mold in order to form the concave portion of the foam. When,
An injection step of injecting a foamed resin material for forming the foam into the lower mold;
The upper mold is closed, and a state in which the displaceable portion is prevented from sagging by the connecting portion formed on the backing material and a molding cavity for molding the foam is formed by the upper mold and the lower mold. Forming a cavity, and
The foamed resin raw material is foamed and flowed in the molding cavity to mold the foam, and the displaceable portion is displaced along the mold convex portion by the foaming flow of the foamed resin raw material, so that the foam is And a foam flow process for fixing the backing material. (Claim 1)

In the present invention, first, as a preparation step, a backing material having a displaceable portion and a connecting portion is prepared.
Next, as a placement step, a backing material is placed on the upper mold. At this time, the displaceable portion of the backing material is opposed to the upper mold convex portion. Next, as an injection process, a foamed resin material for molding the foam is injected into the lower mold.

  Next, as a cavity forming step, the upper mold is closed, and a molding cavity for molding a foam is formed by the upper mold and the lower mold. At this time, in the backing material arranged in the upper die, the sag of the displaceable portion is prevented by the connecting portion. That is, when the upper mold is closed, downward gravity acts on the displaceable portion of the backing material, but this displaceable portion is almost drooped because it is connected to other portions of the backing material by the connecting portion. There is nothing.

Next, as a foaming flow process, the foamed resin material is foamed and flown in the molding cavity to form a foam. At this time, in the molding cavity, the foamed resin material foams and flows while pushing up the backing material toward the upper mold, and fills the cavity.
At this time, since the slidable portion of the backing material is prevented from drooping by the connecting portion, the opening due to the slit is hardly spread. Therefore, the foamed resin raw material does not enter between the backing material and the upper mold from the opening portion by the slit before pushing up the displaceable portion.

Therefore, by the foaming flow of the foamed resin material, the displaceable portion can be displaced to a predetermined position following the upper mold convex portion, and the displaceable portion can be satisfactorily fixed to the surface of the concave portion of the foam. it can.
Therefore, according to the present invention, it is possible to manufacture a cushion body formed by adhering the backing material to the shape of the recess on the back surface side of the foam.

  Moreover, in the said cushion body, a backing material can be appropriately made to exist in the recessed part in the back surface of a foam. Therefore, when a frame such as a sheet is arranged at a position corresponding to the concave portion of the foam, this frame can abut against the backing material arranged in the concave portion and prevent the cushion body from being insufficient in strength. Can do.

The second invention provides a backing material for a cushion body, which is used when a cushion body made of a foam having a concavo-convex portion on the back surface and a cloth-like backing material integrally fixed to follow the concavo-convex portion. Because
A displaceable portion that is displaceable in a direction crossing the surface of the backing material is formed by a slit provided in the vicinity of a portion corresponding to the concave portion in the concave-convex portion of the foam, and the displaceable portion is A backing material for a cushion body having a connecting portion connected to another portion of the backing material (Claim 8).

The backing material of the present invention is used in the above-described method for manufacturing a cushion body, and when the cushion body is molded using the upper mold and the lower mold, when the cushion body is disposed on the upper mold, the displacing portion can be moved by the connecting portion. Can be prevented from sagging. Therefore, in the molding cavity formed by the upper mold and the lower mold, when the cushion body is molded, the displaceable portion can be satisfactorily fixed to the surface of the concave portion of the foam.
Therefore, according to the backing material of the present invention, it is possible to produce a cushion body in which this backing material is made to follow and adhere well to the shape of the concave portion on the back surface side of the foam.

The preferred embodiments of the first and second inventions described above will be described.
In the first invention, the concave portion of the foam is formed between a pair of convex portions, and a mold concave portion for forming the convex portion of the foam is formed on the upper mold. Preferably, the displaceable portion of the backing material is formed at a position corresponding to the concave portion, and the connecting portion of the backing material is formed at a position corresponding to the convex portion. 2).

  In this case, in the foaming flow step, when the foamed resin material is foamed and flowed in the molding cavity, the connecting portion of the backing material can be displaced toward the upper mold recess. As a result, the displaceable portion of the backing material can be displaced more easily following the upper mold convex portion.

Moreover, in the said foaming flow process, it is preferable to displace the said displaceable part according to the said mold convex part by displacing each said connection part toward the said mold recessed part (Claim 3).
In this case, the displaceable part can be displaced more easily following the mold convex part.

Further, the slits of the backing material are formed independently around the displaceable part, and in the foaming flow process, when the connecting part is displaced toward the upper mold, The shape of the connecting portion may change to allow at least one of the distance between adjacent displaceable portions and the distance between the displaceable portion and the other portion of the backing material to be increased. Preferred (claim 4).
In this case, by forming a plurality of slits around the displaceable part, the shape of the connecting part can be changed when the foamed resin material is foamed and flowed in the molding cavity in the foaming flow process. The connecting portion of the backing material can be more easily displaced toward the upper mold recess.

Moreover, it is preferable that the said connection part is formed of the said several slit provided independently alternately (Claim 5).
In this case, the connecting portion can be formed between the plurality of slits, and the connecting portion can be formed without using other members.

Moreover, the said connection part can be formed from the member different from the said backing material (Claim 6).
In this case, in the foaming flow process, when the foamed resin material is foamed and flowed in the molding cavity, the displacement amount of the connecting portion and the displaceable portion of the backing material can be made different. As a result, the displaceable portion of the backing material can be displaced more easily following the upper mold convex portion.

Moreover, it is preferable that the said connection part is extensible toward the protrusion direction of the said convex part of the said foam (Claim 7).
In this case, in the foam flow process, when the foamed resin material is foamed and flowed in the molding cavity, the connecting portion of the backing material can be extended toward the mold recess. As a result, the displaceable portion of the backing material can be displaced more easily following the upper mold convex portion.

In the second aspect of the invention, the connecting portion pulls the displaceable portion when receiving the pressure of the foamed resin raw material for forming the foam, and the displaceable portion is moved to the upper mold side. It is preferable to have an area that generates a force sufficient to be displaced (claim 9).
In this case, the displaceable portion can be pulled by receiving the pressure of the foamed resin raw material so that the displaceable portion can be pulled, and the displaceable portion can be more firmly fixed to the surface of the concave portion of the foam. it can.

Moreover, in the said backing material, it is preferable that the said slit is formed in multiple numbers and the said connection part is formed between these slits (Claim 10).
In this case, since the connecting portion is formed between the slits, the connecting portion can be easily pulled by receiving the pressure of the foamed resin raw material, and the displaceable portion can be Can be more satisfactorily fixed to the surface of the recess.

Moreover, it is preferable that the said backing material consists of a nonwoven fabric (Claim 11).
In this case, the foamed resin raw material can enter the gaps formed in the irregular direction between the nonwoven fabric fibers, and the bonding strength between the molded foam and the backing material can be improved. Moreover, since the nonwoven fabric is formed by intertwining the fibers, it is possible to prevent the fabric from being loosened from the end of the slit and generating lint.

Hereinafter, examples of the method for manufacturing a cushion body and the backing material for cushion body according to the present invention will be described with reference to the drawings.
In the manufacturing method of the cushion body 1 of this example, as shown in FIGS. 1 and 2, the cloth-like backing material 3 is integrally fixed to the back surface 202 side of the foam 2 and the back surface 202 of the foam 2 is formed. The cushion body 1 formed by forming the uneven portion 21 on the side is manufactured.

  When the cushion body 1 is manufactured, as shown in FIGS. 5 and 6, the lower mold 6 that molds the front surface 201 side of the foam 2, and the back surface 202 of the foam 2 that can be opened and closed with respect to the lower mold 6. An upper mold 5 for molding the side is used. On the upper mold forming surface 50 of the upper mold 5, a mold convex part 51 that molds the concave part 211 in the concave and convex part 21 of the foam 2 and a mold concave part 52 that molds the convex part 212 are formed.

And in the manufacturing method of the cushion body 1 of this example, the backing material 3 is fixed to the back surface 202 side of the foam body 2 through the following preparation process, arrangement process, injection process, cavity formation process, and foam flow process. A cushion body 1 is manufactured.
In the preparation step, as shown in FIGS. 3 and 4, the backing material 3 provided with a plurality of slits 31 in the vicinity of the portion corresponding to the concave portion 211 of the foam 2 is prepared. The backing material 3 is formed by a plurality of slits 31, and a displaceable portion 32 </ b> A that is displaceable in a direction crossing the surface of the backing material 3, and the displaceable portion 32 </ b> A is connected to other portions of the backing material 3. And a connecting portion 33.

Next, in the placement step, the backing material 3 is placed on the upper die 5 with the upper die 5 open. At this time, the displaceable portion 32 </ b> A of the backing material 3 is opposed to the mold convex portion 51 of the upper mold 5.
Next, in the injecting step, the foamed resin raw material 20 that is foam-cured to form the foam 2 is injected into the lower mold 6.
Next, in the cavity forming step, as shown in FIG. 5, the upper mold 5 is closed and the foam 2 is molded by the upper mold molding surface 50 of the upper mold 5 and the lower mold molding surface 60 of the lower mold 6. The molding cavity 7 is formed. And when closing the upper mold | type 5, the connection part 33 formed in the backing material 3 prevents sagging of the displaceable part 32A.

  Next, in the foaming flow step, as shown in FIG. 6, the foamed resin material 20 is foamed and flowed in the molding cavity 7 to mold the foam 2. At this time, by the foaming flow of the foamed resin raw material 20, the displaceable portion 32 </ b> A is displaced following the mold convex portion 51 of the upper mold 5, and the backing material 3 is fixed to the foam 2.

Below, it explains in full detail with FIGS. 1-6 about the manufacturing method of the cushion body 1 of this example, and the backing material 3 for cushion bodies.
The cushion body 1 of this example comprises the backrest part of a vehicle seat as shown in FIGS. The vehicle seat is used by covering the surface of the cushion body 1 assembled to the seat frame 4 with a skin material (not shown).
The seat frame 4 is formed by joining a plurality of metal pipes, wires, or the like by welding or the like, and has a frame member 41 disposed along the left-right direction W of the backrest portion (cushion body 1). is doing. The concave portion 211 of the foam 2 is formed as a portion where the frame member 41 is positioned.

Moreover, as shown in FIG. 2, the convex part 212 is formed in the upper and lower sides of the recessed part 211 of the foam 2, respectively. The pair of convex portions 212 is for stably holding the frame member 41 disposed in the concave portion 211 of the foam 2. In addition, the recesses 211 of the foam 2 of this example are formed at two places on the straight line along the left-right direction on the back surface of the cushion body 1, and a total of four protrusions 212 adjacent to the top and bottom of each recess 211. Is formed.
Further, a wire 39 for fixing the backing material 3 and the cushion body 1 is disposed in the vicinity of the formation position of the recess 211 in the foam 2.

As shown in FIGS. 3 and 4, the backing material 3 of this example is made of a non-woven fabric such as felt and has a shape covering almost the entire back surface 202 side of the foam 2. The backing material 3 is preferably made of a laminated nonwoven fabric obtained by laminating 3 to 4 layers of nonwoven fabric materials in consideration of improvement in strength and prevention of the foamed resin material 20 from exuding.
In addition, by using a nonwoven fabric for the backing material 3, the foamed resin material 20 penetrates into the gaps between the fibers formed in the nonwoven fabric in an irregular direction when the cushion body 1 is molded. The bonding strength between 2 and the backing material 3 can be improved.

  Further, as shown in FIG. 4, a displaceable portion 32 </ b> A is formed at a position corresponding to the concave portion 211 of the foam 2 of the backing material 3, and each convex portion 212 formed above and below the concave portion 211 of the foam 2. A connecting portion 33 is formed at a position corresponding to. The slit 31 in the backing material 3 of this example was formed at the same time when the backing material 3 was press-cut from the original fabric into a predetermined shape. On the other hand, the slit 31 can also be formed by cutting with a blade or the like.

  In addition, in the figure, in order to make the formation state of the slit 31 easy to understand, the slit 31 is described with a width. Further, the shape of the slit 31 may be a cut shape or a cut long hole shape. Further, the shape of the slit 31 can be a curved shape or a spiral shape in addition to a linear shape, and can be appropriately determined according to the shape of the uneven portion 21 of the foam 2.

As shown in FIG. 4, the slit 31 of this example includes a main slit 311 that forms the connecting portion 33, and a sub slit 312 that assists the displacement of the connecting portion 33 and the displaceable portion 32 </ b> A.
The main slit 311 is formed substantially parallel to the left-right direction W of the cushion body 1. Further, the sub slit 312 is branched and formed in two from the end of the main slit 311, and is inclined with respect to the left-right direction W of the cushion body 1.
Further, the connecting portion 33 by the main slit 311 is formed corresponding to the formation position of the convex portion 212 formed above and below the concave portion 211 of the foam 2, and in this example, a total of four locations are formed on the backing material 3. Has been.

  Further, the connecting portions 33 are formed between a plurality of main slits 311 provided alternately and alternately. That is, the plurality of main slits 311 are formed in parallel at different end positions in the forming direction of the slits 31 and different in length. In addition, the plurality of main slits 311 of this example are formed substantially parallel to each other.

More specifically, as shown in FIG. 4, the main slit 311 of the present example is a pair of first main slits formed on a straight line so that the ends thereof face each other in the left-right direction W of the cushion body 1. 311A, 311A and a pair of second main slits 311B, 311B formed in parallel with the first main slit 311A on both upper and lower sides of the first main slit 311A. The sub slit 312 is inclined with respect to the first main slit 311A and is branched into two from the outer end portion of the first main slit 311A.
In addition, the connecting portion 33 of this example is formed above and below the displaceable portion 32A (on the drawing), and each connecting portion 33 is another displaceable portion that is the displaceable portion 32A and the other part of the backing material 3. The possible part 32B is connected.

  Further, the connecting portion 33 can be deformed so as to widen the plurality of main slits 311. As shown in FIG. 2, in the cushion body 1 in which the backing material 3 is fixed to the back surface 202 side of the foam 2, the connecting portion 33 of the backing material 3 faces the protruding direction of the convex portion 212 of the foam 2. Thus, the displaceable portion 32 </ b> A of the backing material 3 is fixed to the surface of the concave portion 211 of the foam 2.

  Further, the connecting portion 33 formed by the plurality of main slits 311 displaces the displaceable portion 32A to the upper mold 5 side when receiving the flow pressure of the foamed resin raw material 20 for molding the foam 2. It is preferable to have an area that generates a force sufficient for (pulling up).

Next, a method for manufacturing the cushion body 1 using the cushion body backing material 3 will be described in detail.
In manufacturing the cushion body 1, the backing material 3 provided with the displaceable parts 32A and B and the connecting part 33 described above is prepared as a preparation process.
Next, as the placement step, the backing material 3 is placed on the upper mold 5 in the opened state. At this time, the displaceable portion 32 </ b> A of the backing material 3 faces the mold convex portion 51 of the upper mold 5, and the connecting portions 33 of the backing material 3 face each mold recess 52 formed on both sides of the mold convex portion 51. The backing material 3 is arranged as described above. The lower mold 6 is provided with a wire 39.

As shown in FIGS. 3 and 5, when the backing material 3 is disposed on the upper die 5, a bag-like portion 34 formed on the upper end portion of the backing material 3 is placed on the protruding portion of the upper die 5, and the backing material 3 The backing metal 3 is fixed to the upper die 5 by attracting a magnetic metal member 35 such as a stapler fastened to the lower end portion to a magnet 53 disposed on the upper die 5 by a magnetic force. Further, the through hole 37 formed in the intermediate portion of the backing material 3 is fixed to the upper mold 5 by a fixing tool 36 such as a pin. At this time, a slit 38 can be provided in the backing material 3 so that the backing material 3 can easily follow the shape of the upper mold 5.
Next, as an injection process, the foamed resin raw material 20 for molding the foam 2 is injected into the lower mold 6.

  Next, as a cavity forming step, as shown in FIG. 5, the upper mold 5 is closed, and a molding cavity for molding the foam 2 by the upper mold forming surface 50 of the upper mold 5 and the lower mold forming surface 60 of the lower mold 6. 7 is formed. At this time, in the backing material 3 arranged on the upper mold 5, the slidable portions 32 </ b> A and 32 </ b> B are prevented from hanging down by the connecting portion 33. That is, when the upper die 5 is closed, downward gravity acts on the displaceable portion 32A of the backing material 3, but this displaceable portion 32A is connected to the other displaceable portions 32B of the backing material 3 by the connecting portion 33. Because it is connected, it hardly hangs down.

Next, as shown in FIG. 6, as the foaming flow process, the foamed resin material 20 is foamed and flowed in the molding cavity 7 to form the foam 2. At this time, in the molding cavity 7, the foamed resin material 20 foams and flows while pushing up the backing material 3 toward the upper mold 5.
The figure shows a state in which the foamed resin raw material 20 (indicated by a two-dot chain line) immediately after being injected into the lower mold 6 is foamed and flowed.

  Until the contact with the foamed resin raw material 20 that flows and flows, in the backing material 3, the slidable portion 32 </ b> A is prevented from sagging by the connecting portion 33, and the opening portion by the main slit 311 is almost unexpanded. Therefore, the foamed resin material 20 does not enter between the backing material 3 and the upper mold 5 through the opening formed by the main slit 311 before pushing up the displaceable portion 32A.

  And each connection part 33 is displaced toward the mold | type recessed part 52 of the upper mold | type 5 in response to the pressure at the time of the foaming resin raw material 20 foam-flowing. At this time, the connecting portion 33 is deformed and is displaced toward the surface of the mold concave portion 52 of the upper mold 5 while expanding the opening portion by the main slit 311.

Due to the shape change of the connecting portion 33 due to the flow pressure of the foamed resin raw material 20, the distance between the displaceable portion 32A and another displaceable portion 32B is expanded, and each displaceable portion 32A, B is replaced with the mold of the upper mold 5. It can be displaced following the projection 51. Thus, each displaceable portion 32A, B can be satisfactorily fixed to the surface of the concave portion 211 of the foam 2.
Therefore, according to the manufacturing method of this example, it is possible to manufacture the cushion body 1 in which the backing material 3 follows and adheres well to the shape of the uneven portion 21 on the back surface 202 side of the foam 2.

  Further, as shown in FIG. 2, in the cushion body 1, the backing material 3 can appropriately exist in the concave portion 211 on the back surface of the foam 2. Therefore, when the frame member 41 of the seat frame 4 is disposed at a position corresponding to the recess 211 of the foam 2, the frame member 41 can abut against the backing material 3 disposed in the recess 211, and the cushion It is possible to prevent the strength of the body 1 from being insufficient. Moreover, the connection part 33 may finally be in the state embedded in the convex part 212 of the foam 2.

  The backing material 3 of this example is made of one type of member, and the connecting portion 33 and the displaceable portions 32A and B are made of the same member as the general portion of the backing material 3. On the other hand, the connection part 33 can also be formed from a member different from the member which comprises the general part of the backing material 3. FIG. In this case, it is preferable that at least the connecting portion 33 is made of a material that is easier to extend than the general portion of the backing material 3, so that the tracking of the backing material 3 becomes better.

The perspective view which shows the cushion body in an Example. It is a figure which shows the cushion body in an Example, and is AA arrow sectional drawing in FIG. Explanatory drawing which shows the backing material in an Example. The top view which shows the formation state of the displaceable part in a backing material and a connection part in an Example. Sectional drawing which shows the state which shape | molds a foam in the shaping | molding cavity in an Example. Sectional drawing which expands and shows the state which a foamed resin raw material displaces the displaceable part and connecting part of a backing material in a shaping | molding cavity in an Example. The top view which shows the formation state of the slit and opening hole of a backing material in a prior art example. Sectional drawing which expands and shows the state which shape | molds a cushion body using the upper mold | type and lower mold | type in a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cushion body 2 Foam 20 Foamed resin raw material 201 Front side 202 Back side 21 Concavity and convexity 211 Concave portion 212 Convex portion 3 Backing material 31 Slit 32A, B Displaceable portion 33 Connection portion 5 Upper die 51 Type convex portion 52 Type concave portion 6 Lower Mold 7 Molding cavity

Claims (11)

Using a lower mold that molds the front side of the foam and an upper mold that can be opened and closed with respect to the lower mold and that molds the back side of the foam, and has an uneven part on the back side, following the uneven part A method of manufacturing a cushion body made of the above foam, to which a cloth-like backing material is integrally fixed,
A displaceable portion that is displaceable in a direction crossing the surface of the backing material is formed by a slit provided in the vicinity of a portion corresponding to the concave portion in the concave-convex portion of the foam, and the displaceable portion is A preparation step of preparing a backing material having a connecting portion connected to the other part of the backing material;
An arrangement step of disposing the backing material on the upper mold in a state where the upper mold is opened, and causing the displaceable portion to face a mold convex portion formed on the upper mold in order to form the concave portion of the foam. When,
An injection step of injecting a foamed resin material for forming the foam into the lower mold;
The upper mold is closed, and a state in which the displaceable portion is prevented from sagging by the connecting portion formed on the backing material and a molding cavity for molding the foam is formed by the upper mold and the lower mold. Forming a cavity, and
The foamed resin raw material is foamed and flowed in the molding cavity to mold the foam, and the displaceable portion is displaced along the mold convex portion by the foaming flow of the foamed resin raw material, so that the foam is A method for producing a cushion body comprising a foaming flow process for fixing a backing material. In Claim 1, the concave portion of the foam is formed between a pair of convex portions, and the upper mold is formed with a mold concave portion for molding the convex portion of the foam.
The displaceable portion of the backing material is formed at a position corresponding to the concave portion, and the connecting portion of the backing material is formed at a position corresponding to the convex portion, respectively. Production method.   3. The cushion body according to claim 2, wherein in the foaming flow step, the displaceable portion is displaced following the mold convex portion by displacing each connecting portion toward the mold concave portion. Production method. The slits of the backing material according to any one of claims 1 to 3, wherein a plurality of slits are independently formed around the displaceable portion,
In the foaming flow step, when the connecting portion is displaced toward the upper mold, the shape of the connecting portion changes, and the distance between the adjacent displaceable portions and the displaceable portion and the backing are changed. A method for manufacturing a cushion body, characterized in that at least one of distances between other parts of the material is allowed to increase.   The method of manufacturing a cushion body according to any one of claims 1 to 4, wherein the connecting portion is formed by a plurality of the slits provided alternately and alternately.   The method for manufacturing a cushion body according to any one of claims 1 to 5, wherein the connecting portion is made of a member different from the backing material.   The method for manufacturing a cushion body according to any one of claims 2 to 6, wherein the connecting portion is extendable in a protruding direction of the convex portion of the foam. A backing material for a cushion body used when manufacturing a cushion body made of a foam having a concavo-convex portion on the back side and a cloth-like backing material integrally fixed following the concavo-convex portion,
A displaceable portion that is displaceable in a direction crossing the surface of the backing material is formed by a slit provided in the vicinity of a portion corresponding to the concave portion in the concave-convex portion of the foam, and the displaceable portion is A backing material for a cushion body, characterized in that it has a connecting portion connected to the other part of the backing material.   9. The connecting portion according to claim 8, wherein the connecting portion pulls the displaceable portion when receiving the pressure of the foamed resin raw material for forming the foam, and is sufficient to displace the displaceable portion toward the upper mold side. A backing material for a cushion body, characterized by having an area for generating a strong force.   The cushioning backing material according to claim 8 or 9, wherein a plurality of the slits are formed, and the connecting portion is formed between the plurality of slits.   The backing material for a cushion body according to any one of claims 8 to 10, wherein the backing material comprises a nonwoven fabric.

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