JP2013233770A - Method for manufacturing cushion body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a cushion body which works directly on a skin layer newly formed during a demolding step and solves existing problems shielded by a previous pad skin layer at once.SOLUTION: In a method for manufacturing a cushion body made by performing foaming molding after injection of a foaming starting material g to a cavity C and mold closure, the injection of the foaming starting material g and the mold closure are performed by using a foaming mold 1 provided with a pin 4 with protrusions made by forming a plurality of protrusions 6 in a circumferential direction on an outer circumferential surface 52 of an axial pin 5 vertically disposed on a mold surface 31 which forms the back surface 7b side of the cushion body 7. Further, such a state as to project the pin 4 with protrusions into the cavity C from a mold surface (31) is brought about by the mold closure, subsequently, the pin 4 with the protrusions is embedded to perform the foaming molding and, thereafter, the axial pin 5 scrapes a skin layer 85 of a hole wall 82 formed on a molding body 8 by the foaming molding and, at the same time, the cushion body 7 is demolded.

Description

  The present invention relates to a method for manufacturing a cushion body using a polyurethane raw material or the like.

For example, if a cushion body such as a cushion pad that constitutes a seat portion in a vehicle seat is left as it is after foam molding, the gas in the closed cells contracts due to natural cooling, and the cushion body contracts. Cause deformation. Therefore, conventionally, after demolding, a crushing process is performed in which the closed cell membrane is broken and the gas inside the pad is extracted. As a crushing treatment method, the pad of the cushion body P is crushed by the roller R, the gas inside the pad is pushed out (a in FIG. 10), the gas is drawn using a vacuum tank, and the roller R is crushed. Later, there is a combined method of degassing with a vacuum tank.
However, there is a problem that degassing is blocked by the pad skin layer only by crushing with a roller or vacuuming. Even after the crushing treatment, a phenomenon in which the cushion body is pulled into the interior by the residual pressure is observed, which adversely affects the pad dimensions. In the case of using a roller, since bubbles are large when the cushion body P has a low density and a pad thickness, a large crack in the vertical direction as shown in FIG. This causes a problem called running burst BT (internal burst, external burst).
For these reasons, several improved inventions have been proposed for the crushing process (for example, Patent Documents 1 to 3).

JP 2009-292022 A JP-A-3-243335 Japanese Patent Laid-Open No. 1-182013

However, in all of the inventions of Patent Documents 1 to 3, the pad skin layer is subjected to destruction treatment and crushing treatment after demolding. It was an independent post-process, requiring equipment, work time, work space, etc.
Patent Document 1 states that “a large number of fine needles having a diameter of less than 0.8 mm are inserted into a seat pad in a state where the contraction immediately after demolding has not progressed, and the penetration depth is more than half of the thickness of the seat pad. Stab into the seat pad to break the foam of the seat pad ”, but it is necessary to have a separate equipment for deeply piercing a large number of fine needles, and to secure the installation space. It was. Further, in order to sufficiently destroy and crush the pad skin layer, it is necessary to pierce the fine needle deeply into the seat pad, and there is a possibility that it takes time for the crushing operation.
The inventions of Patent Documents 2 and 3 are improved inventions of the roller method. However, as in Patent Document 1, it is a post-process treatment after demolding, which requires equipment, work time, work space, and the like. Furthermore, when a rotating roll having elastic plastic fibers standing on the surface as in Patent Document 3 is used, a large pressure cannot be applied, so that it takes time to break the pad skin layer and becomes insufficient. There was a fear.

  The present invention solves the above problem, and provides a method for manufacturing a cushion body that works directly on a newly formed skin layer in a demolding process and solves the problem of being blocked by a conventional pad skin layer at once. The purpose is to do.

  In order to achieve the above object, the gist of the invention described in claim 1 is to provide a cushion body in a method for producing a cushion body by foaming after injecting a foam raw material (g) into the cavity (C) and closing the mold. A shaft pin (5) is erected on the mold surface (31) forming the back surface (7b) side of (7), and is projected in the circumferential direction on the outer peripheral surface (52) of the shaft pin (5). Using a foaming mold (1) provided with a plurality of protruding pins (4) provided with a plurality of (6), the foaming raw material (g) is injected and the mold is closed, and the mold is closed from the mold surface (31). The protruding pin (4) is protruded into the cavity (C), and then the protruding pin (4) is embedded and foam-molded, and then the axial pin (5) is molded by foam molding. The cushion body (7) is removed while the skin layer (85) of the hole wall (82) formed in (8) is scratched by the protrusion (6). . According to a second aspect of the present invention, there is provided a method for producing a cushion body according to the first aspect, wherein the shaft-like pin (5) stands upright with respect to the mold surface (31) and the plurality of protrusions (6) are formed in the shape of the shaft. The pin (5) is formed so as to project radially outward from the outer peripheral surface (52) around the pin (5). A method of manufacturing a cushion body according to a third aspect of the present invention is the method of manufacturing the cushion body according to the first or second aspect, wherein a plurality of pins (4) with protrusions are provided on the mold surface (31), and each axial pin related to the pin with protrusions is provided. Are arranged to be parallel to each other. According to a fourth aspect of the present invention, there is provided a method for manufacturing a cushion body according to the first to third aspects, wherein the protrusion is provided on the mold surface (31) of the upper mold (3) forming the back surface (7b) side of the cushion body (7). A foaming mold (1) provided with a pin (4), and further, a backing material provided with a through hole (90) in a portion corresponding to the pin with projection (4) in the foaming mold (1) ( 9) and using the protruding pin (4) inserted through the through-hole (90), and mounting and setting the backing material (9) on the upper mold surface (31), the foaming raw material ( Injecting and closing the mold g), and by closing the mold, the projecting pin (4) protrudes from the mold surface (31) into the cavity (C).

  The cushion body manufacturing method of the present invention is such that the mold is closed, the protruding pin protrudes from the mold surface into the cavity, a new skin layer is formed on the molded body by foam molding, and the subsequent demolding operation is performed. By simply carrying out the process, the protrusion is scratched on the skin layer, and the gas venting problem that has been blocked by the pad skin layer can be easily solved.

As in the first aspect of the invention, when the mold is closed and the projecting pin (4) is projected from the mold surface (31) into the cavity (C), the pad skin layer of the original cushion body is formed by subsequent foam molding. In addition, the protruding pin forms a new skin layer of the hole wall. If the pin (4) with protrusions provided with a plurality of protrusions (6) in the circumferential direction is provided on the outer peripheral surface (52) of the shaft-shaped pin (5), the skin layer of the hole wall is formed by a normal demolding operation. The protrusion is scratched. Even if the pad skin layer of the original cushion body is left as it is, the skin layer of the hole wall is scratched and broken by the protrusion, so that the inside of the pad and the outside air are easily conducted in the subsequent crushing operation. Conventionally, the problem that has been blocked by the pad skin layer can be solved simply by removing the mold.
As in the second aspect of the invention, when the shaft-like pin (5) stands upright with respect to the mold surface (31), gas can be easily vented to a deep part of the molded body. If the multiple protrusions (6) are formed to project radially outward from the outer peripheral surface (52) around the axial pin (5), they can be scratched over a wide area of the hole wall skin layer. , Degassing effect in the molded body is increased during crushing.
As in the third aspect of the invention, if a plurality of pins (4) with protrusions are provided on the mold surface (31), the area where the skin layer is destroyed doubles, and uniform degassing can be quickly performed over a wide area of the molded body. Proceed to Since the shaft-like pins related to the pins with protrusions are arranged so as to be parallel to each other, there is no problem in removing the cushion body. As in the invention of claim 4, after inserting the protruding pin (4) into the through hole (90) and mounting and setting the backing material (9) on the upper mold surface (31), the foaming raw material (g) When the mold is injected and the mold is closed, even the cushion body having the backing material can be easily degassed by the pad skin layer.

It is one form of the manufacturing method of the cushion body of the present invention, and is a schematic sectional view of the foaming type. FIG. 2 is a schematic cross-sectional view in which a foaming raw material is injected into the foaming mold of FIG. 1 and then the mold is closed. FIG. 3 is a schematic cross-sectional view subsequent to FIG. 2 for foam molding. It is a principal part enlarged view of FIG. It is a schematic explanatory drawing which shows the mode of mold removal. It is the elements on larger scale which show a mode that demolding progressed a little from the state of FIG. FIG. 7 is another embodiment of a pin with a protrusion in place of the pin with a protrusion in FIGS. 1 to 6. In the explanatory view of the cushion body after demolding, (a) is an overall sectional view, (b) is an overall perspective view, and (c) is an enlarged view of a main part of (a). It is a schematic cross section of the foaming type | mold of the other aspect replaced with FIG. (A) is an explanatory view of a conventional crushing process, and (b) is an explanatory view of a burst.

  Hereinafter, the manufacturing method of the cushion body concerning the present invention is explained in full detail. 1 to FIG. 9 are one form of the cushion body manufacturing method of the present invention, FIG. 1 is a cross-sectional view of the foaming mold, FIG. 2 is a cross-sectional view in which the foaming raw material is injected into the foaming mold of FIG. 3 is a cross-sectional view of foam molding following FIG. 2, FIG. 4 is an enlarged view of the main part of FIG. 3, FIGS. 5 and 6 are explanatory views showing the state of demolding, and FIG. 8 is an explanatory view of the cushion body after demolding, and FIG. 9 is a cross-sectional view of another embodiment of the foaming mold in place of FIG. In each figure, the shaft-like pin 5, the protrusion 6, and the backing material 9 are drawn larger for easy understanding.

The cushion body 7 of this embodiment is a rear seat for a vehicle and is applied to a cushion pad that supports the lower half of a seated occupant. If the cushion pad 7 is covered with an outer skin to form a seat pad, a vehicle seat is formed by a known backrest and a known headrest.
Prior to the method of manufacturing the cushion body, the cushion pad foaming mold 1 and the backing material 9 in which the molded body 8 is made of foam will be described.

The foaming mold 1 is composed of a pair of split molds (a lower mold 2 and an upper mold 3). After the sheet-like backing material 9 such as a non-woven fabric is set and then the mold is closed, the cavity C of the cushion pad 7 is formed. The cushion pad 7 shown in FIG. 8 is formed by foaming the cushion pad 7 so that the backing material 9 set on the cavity forming mold surface 31 of the upper mold 3 is adhered and integrated to the back surface 7b.
In the foam mold 1, in FIG. 2, the left and right lateral direction of the paper forms a vehicle front-rear direction cavity C of the cushion pad 7 when the vehicle is installed, and the right side corresponds to the front side of the vehicle. The vehicle width direction is the direction perpendicular to the paper surface. The protrusion-provided pin 4 is provided on the mold surface 31 of the upper mold 3 (one divided mold) according to the foaming mold 1.

  The protrusion-provided pin 4 includes an axial pin 5 and a protrusion 6 and is fixed to a mold surface 31 that forms the back surface 7 b side of the cushion pad 7. The shaft pin 5 is a straight metal rod-like body, and is erected and fixed to the mold surface 31 of the upper mold 3. The shaft pin 5 is fixed to the mold surface 31 by screwing. A mounting portion 55 whose axial diameter is slightly smaller in the axial direction is extended from the base end portion 53 of the shaft-shaped pin 5 and a male screw portion is formed in the mounting portion. Then, a mounting hole 33 having a female screw portion is formed on the mold surface 31 side (FIG. 4), and the shaft-like pin 5 is screwed and fixed to the female screw portion. Here, the shaft-like pin 5 referred to in the present invention is sufficient if it is a linear metal elongated member, and includes a pipe-like body and a rod-like body. The cross-sectional shape of the shaft-like pin 5 and its axial length are appropriately selected depending on the shape, properties, etc. of the cushion pad 7.

  The protrusion 6 is a part of the outer peripheral surface 52 of the shaft-like pin 5 protruding outward, and is a conical metal spine having a sharp tip as shown in FIGS. A plurality of protrusions 6 are formed in the circumferential direction on the outer peripheral surface 52 of the shaft-shaped pin 5 and are integrated with the shaft-shaped pin 5 by welding or the like. Here, four spinous processes 6 are provided on the outer peripheral surface 52 near the protruding end surface 50 of the shaft-shaped pin 5 at a 90 ° pitch in the circumferential direction, and the periphery of the shaft-shaped pin 5 is shifted slightly in the axial direction. Four spinous processes 6 are provided at a 90 ° pitch in the direction, for a total of eight. Each spinous process 6 is formed to project on the outer peripheral surface 52 near the projecting end of the axial pin 5. In FIG. 4, the protrusion 6 on the protruding end surface 50 side and the protrusion 6 on the proximal end 53 side are arranged in the vertical direction, and when both are shifted by 45 ° in the circumferential direction of the axial pin 5 so that they are arranged in a staggered manner, More preferred. This is because a range in which the skin layer 85 of the hole wall 82 is scratched by the protrusion 6 is widened at the time of demolding (details will be described later).

In the present embodiment, as shown in FIG. 3, the pin 4 with the protrusion is provided on the mold surface 31 where the cushion pad 7 is thick, and the axial pin 5 stands upright with respect to the mold surface 31. A plurality of projections 6 (in this case, two sets of four each shifted in the axial direction) are formed so as to project radially from the outer peripheral surface 52 with the axial pin 5 as an axis.
In addition to the foaming mold 1, a backing material 9 as an insert member is prepared. In the backing material 9, a through hole 90 is formed at a portion corresponding to the pin 4 with the protrusions by being set on the upper mold surface 31. Prior to foam molding of the cushion pad 7, a sheet-like backing material 9 having a size that can be attached to almost the entire back surface of the pad body that is the molded body 8 is prepared.

  The cushion pad 7 is manufactured using the foaming mold 1 and the backing material 9 as follows. The cushion pad 7 includes a pad body 8 that is foam-molded, and a backing material 9 that is attached to and integrated with the pad body back surface 8b by foam molding. In addition, if it is the cushion pad 7 (cushion body) which does not have insert members, such as backing material 9, the pad main body 8 (molded main body) will become the cushion pad 7 as it is.

  First, the backing material 9 is set on the upper mold 3 in the mold open state of FIG. The protruding pin 4 is inserted into the through hole 90, and the backing material 9 is attached and set to the upper mold surface 31 with a locking tool (not shown). The through-hole 90 is a small hole through which the protruding pin 4 can be passed.

After the sheet-like backing material 9 is set on the mold surface 31, the foaming raw material g is injected and the mold is closed. After the backing material 9 is set on the upper mold surface 31, the pad is opened using the injection hose N or the like on the mold surface 21 that forms the cavity C of the lower mold 2 (other divided mold) with the mold open. A predetermined amount of foaming raw material g such as a urethane foam stock solution for molding a main body is injected (FIG. 1). Subsequently, the upper mold 3 is operated to close the mold. Reference numeral 11 is a hinge, reference numerals 29 and 39 are the mating surfaces of the lower die 2 and the upper die 3, and reference numerals 37 and 38 are front end forming portions and rear end forming portions.
By closing the upper mold 3 and the lower mold 2, a cushion pad cavity C into which the backing material 9 is inserted is formed. At the same time, when the mold is closed, the projecting pin 4 protrudes from the mold surface 31 into the cavity C as shown in FIG. In addition, after setting the backing material 9 to the foaming mold 1, the foaming raw material g was injected, and then the mold was closed, but after setting the backing material 9 to the foaming mold 1, the mold was closed, It is also possible to inject a foaming raw material g.

After closing the mold, the process proceeds to foam molding of the cushion pad 7. The mold closed state of FIG. 2 is maintained for a predetermined time, and the pad main body 8 on which the backing material 9 is attached and integrated on the cushion pad back surface 7b side as shown in FIG. 3 is foam-molded. In this foam molding, the projecting pin 4 protruding into the cavity C is embedded in the pad main body 8.
Here, when the foam molding is almost finished and a foam body of the pad main body 8 is formed, the entire outer surface is covered with a film-like pad skin layer as in normal foam molding. The hole wall 82 of the shaft hole formed by embedding the shaft pin 5 also becomes the outer surface of the pad body 8, and a new outer surface portion is formed by the shaft pin 5 and covered with the skin layer 85. As shown in FIG. 4, a skin layer 85 film is formed on the hole wall 82 formed in the pad main body 8 by foam molding of the axial pin 5. A thin film skin pad layer 85 is formed on the wall surface of the hole where the shaft-like pin 5 arranged in the pad main body 8 contacts the pad main body 8, and the protrusion 6 arranged in the pad main body 8 contacts the pad main body 8. A thin skin layer 86 is also formed on the surface.

  After the foaming of the pad body 8 is finished, the cushion pad 7 is subsequently removed (FIG. 5). Since the protrusion-provided pin 4 is embedded in the pad main body 8 and the protrusion 6 protrudes radially outward from the shaft-shaped pin 5, the skin layer formed in the hole wall 82 around the shaft-shaped pin 5 in the pad main body 8. While scratching 85 with the spinous process 6, the cushion pad 7 is removed (FIG. 6). Reference numeral HT indicates a crack in the skin layer 85 due to scratching. The demolding proceeds while the skin layer 85 of the hole wall 82 is scratched by the protrusion 6, and the skin layer 85 is torn by this scratching, so that the pad skin layer on the outer surface of the pad main body 8 becomes the gas in the pad main body 8. It solves the existing difficult problems that have been obstructed.

At the time of demolding, the mold is opened, and the cushion pad 7 is taken out from the upper mold 3 in the direction of the white arrow in FIG. 5. However, the cushion pad 7 is shown in FIG. It is taken out while scratching the skin layer 85 as in 6. The protrusion 6 protruding from the outer peripheral surface 52 of the shaft-like pin 5 forcibly deforms the pad main body 8 around the hole wall 82 and scratches and breaks the skin layer 85. By removing the skin layer 85 by scratching in the demolding process, the gas remaining in the pad main body 8 is smoothly vented. Although the skin layer 85 of the hole wall 82 is destroyed and its surface is roughened, there is no problem because it does not appear in the appearance of the product.
When the demolding is completed, the desired cushion pad 7 is obtained in which the backing material 9 is adhered and integrated to the back surface 8b of the pad main body and the skin layer 85 of the hole wall 82 is broken (FIG. 8).

  Reference numeral 80 is a pin hole formed by the shaft-shaped pin 5, reference numeral 81 is a recess formed by the protrusion 6, reference numeral 80a is a pin hole opening formed by the protruding pin 4 appearing on the back side 7b of the cushion pad, and reference numerals 87 and 88 are front end surfaces of the cushion pad. The rear end face is shown.

The projection-provided pin 4 of the present invention is not limited to that used in FIGS. 1 to 6, and for example, the projection-provided pin 4 as shown in FIG. 7 can be used.
7 (a) and 7 (b) are a side view and a front view of the protrusion-equipped pin 4 in which the gear-shaped protrusion 6 is fixed near the protruding end surface 50 of the shaft-like pin 5, and FIGS. 7 (c) and 7 (d) are metal bars. 7 is a side view and a front view of the pin 4 with projections in which a large number of conical spinous processes 6 are fixed to the outer peripheral surface 52 of the shaft-shaped pin 5, and FIG. 7E is a screw portion on the shaft-shaped pin 5 of the bolt shaft. It is the front view in which the spiral-shaped continuous protrusion 6 was formed. 7 (f) and (g) are a side view and a front view of the pin 4 with protrusions in which a plurality of (four in this case) arrowhead protrusions 6 are formed at the tip, and FIGS. With a protrusion with a 3.2mmφ through hole in the shaft pin 5 near the protruding end face 50, a wire pin of about 3mmφ passed through the through hole and protruding at both ends as protrusions 6 and then fixed at the base by welding. 7A and 7B are a side view and a front view of the pin 4 with protrusions in which the spinous protrusions 6 are formed to protrude from the outer peripheral surface 52 of the pin near the protruding end surface 50 with a welding wire. It is. 7 (b), (d) and (e) are not shown around the base end portion 53, but are screwed into the mounting hole 33 having the female thread portion on the mold surface 31 side. The attachment part 55 which has the same external thread part as is provided.

The projection 6 of the pin 4 with the projection is a projection in which a part of the outer peripheral surface 52 of the shaft-like pin 5 protrudes outward or is raised, and it is sufficient if the hole wall skin layer 85 can be scratched during demolding. As shown in FIGS. 1 and 7 (a) to (d), it is more preferable if the protrusion 6 has a pointed spine shape. This is because the role of scratching the skin layer 85 by demolding can be more effectively achieved. Even when the tip 6 is not a sharp point as shown in FIGS. It has the same effect as the spinous process 6 in FIGS.
Further, it is more preferable that the protrusion 6 is provided at or near the protruding end surface 50 so that the attachment position to the shaft-like pin 5 is aligned with the protruding end surface 50. This is because the protrusion 6 penetrates deep into the pad main body 8 by foam molding of the cushion pad 7, and the skin layer 85 of the hole wall 82 can be scratched from the back to destroy the skin layer. Furthermore, it is more preferable to provide a large number of protrusions 6 on the outer peripheral surface 52 as shown in FIG. 7 (d). The protrusions 6 arranged in the axial direction as shown in FIG. 6 are the protrusions 6 shown in FIGS. More preferably, a staggered arrangement is used. This is for expanding the scratch range of the skin layer 85 and ensuring the reliability.

Moreover, although the foaming type | mold 1 of FIGS. 1-6 has only one pin 4 with a protrusion, multiple pieces can be provided. For example, FIG. 9 shows another embodiment of the foaming mold 1 in place of FIG. 1, and the upper mold 3 is provided with two protrusions 4. The shaft-like pins 5 related to the two (plural) protruding pins 4 are arranged in parallel to each other.
Using the foam mold 1, two hole walls 82 are formed by foam molding in the same manner as in the production of the cushion pad 7. In the subsequent demolding step, the cushion layer 7 is made by scratching the skin layers 85 of the both-hole walls 82 with the protrusions 6 and scratching and peeling the skin layers 85. Since the shaft-like pins 5 related to the two (plural) protruding pins 4 are parallel to each other, the removal of the cushion pad 7 from the upper mold 3 is not hindered and the mold is smoothly removed. In this way, a desired cushion pad 7 in which the skin layer 85 is broken in a wider range (two hole walls 82) of the pad body 8 is obtained.

The method of manufacturing the cushion body configured as described above is to form a new skin layer 85 with the protruding pins 4 separately from the outer surface side pad skin layer that has been provided in the foam molding process of the cushion pad 7 and to perform the subsequent demolding process. Since the skin layer 85 is naturally broken, the gas can be released from the pad main body 8 through the broken portion.
That is, when the mold is closed, the projecting pin 4 is projected from the mold surface 31 into the cavity C, and in the subsequent foam molding, the projecting pin 4 is embedded to form the hole wall 82 in the pad body 8. A skin layer 85 is formed. In addition to the conventional pad skin layer that the cushion pad 7 forms on the outer layer, a new skin layer 85 is formed on the hole wall 82 that the pin 4 with protrusions digs into the pad body 8 from the back surface 7b of the cushion pad.
Then, in the subsequent demolding step, the cushion pad 7 is taken out while scratching the newly-created skin layer 85 with the protrusions 6, so that the skin layer 85 is scratched and broken. In particular, scratching the skin layer 85 with the protrusion 6 is in a demolding process in which the pad main body 8 is not completely cured, and thus the skin layer 85 can be easily scratched and broken by this scratch. In the process of removing the cushion pad 7 as the product from the foaming mold 1, the skin layer 85 is naturally scratched and broken by the protrusions 6. There is no need to provide a separate process for breaking the skin layer 85. Thus, the conventional problem that the skin layer 85 blocks outgassing by crushing treatment or the like is solved at once.

Further, since the protruding pin 4 is protruded from the mold surface 31 into the cavity C, and the skin layer 85 provided deep into the pad main body 8 is broken during the demolding process, excessive foaming in the pad main body 8 is performed. Gas can be extracted quickly from an early stage. Since the skin layer 85 is broken at the time of demolding, the residual gas in the pad main body 8 tends to escape, so that the dimensions of the pad main body 8 and the cushion pad 7 are stabilized early.
Furthermore, if the skin layer 85 of the hole wall 82 is scratched and broken, the skin layer that inhibits deaeration is likely to be ventilated, so that countermeasures against bursts are taken.

Since the skin layer 85 formed deep into the pad main body 8 is naturally broken in the demolding process, it is not necessary to separately pierce the fine needle deep into the pad main body 8 as in Patent Document 1 after demolding. .
In addition, since the skin layer 85 of the hole wall 82 is broken, when crushing with a roller, the skin layer 85 is no longer obstructed by the skin layer 85, so that the crushing process can be simplified in a later step. A process and equipment for breaking the skin layer 85 are not necessary. A number of excellent effects are exhibited such that the crushing process can be carried out smoothly even if a simple roller is used instead of the brush of Patent Document 2 and the rotating roll having the plastic fiber of Patent Document 3 standing on the surface.

  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, and the like of the foaming mold 1, the pins with protrusions 4, the shaft-shaped pins 5, the protrusions 6, the cushion body 7, the molded body 8, the backing material 9 and the like can be appropriately selected according to the application. For example, the foam mold 1 may be a core mold, and the cushion body 7 can be applied to other foam molded products such as a back pad.

DESCRIPTION OF SYMBOLS 1 Foam type 31 Mold surface 4 Pin with protrusion 5 Shaft-shaped pin 52 Outer peripheral surface 6 Projection 7 Cushion body (cushion pad)
7b Back 8 Molding body (pad body)
82 hole wall (hole wall created by a shaft pin)
85 Skin layer (Skin layer of hole wall)
9 Backing material (insert material)
90 Through-hole C Cavity g Foaming raw material

Claims (4)

In the method of manufacturing a cushion body formed by foaming after injecting the foam raw material (g) into the cavity (C) and closing the mold,
A shaft pin (5) is erected on the mold surface (31) forming the back surface (7b) side of the cushion body (7), and the outer peripheral surface (52) of the shaft pin (5) is circumferential. The foam raw material (g) is injected and the mold is closed using a foaming mold (1) provided with a plurality of protrusion-provided pins (4) provided with a plurality of protrusions (6). ) To protrude into the cavity (C) into the cavity (C), and then the foamed pin (4) is embedded and foam-molded, and then the shaft-shaped pin (5) is foam-molded. The cushion body (7) is demolded while the skin layer (85) of the hole wall (82) formed in the molded body (8) is scratched by the protrusion (6), and the cushion body manufacturing method is characterized in that . The shaft-like pin (5) stands upright with respect to the mold surface (31), and the plurality of protrusions (6) are removed from the outer peripheral surface (52) of the shaft-like pin (5) as an axis. The method for manufacturing a cushion body according to claim 1, wherein the cushion body is formed to project radially. The said pin with a protrusion (4) is provided with two or more by the said mold surface (31), and each axial pin which concerns on this pin with a protrusion is arrange | positioned so that it may mutually become parallel. Cushion body manufacturing method. A foam mold (1) having the pin (4) with the protrusion on the mold surface (31) of the upper mold (3) forming the back surface (7b) side of the cushion body (7), and further, the foam mold (1 ), Using a backing material (9) provided with a through hole (90) in a portion corresponding to the protruding pin (4),
After inserting the protruding pin (4) into the through hole (90) and mounting and setting the backing material (9) on the upper mold surface (31), injection of the foaming material (g) and mold closing are performed. The method of manufacturing a cushion body according to any one of claims 1 to 3, wherein the projecting pin (4) is protruded from the mold surface (31) into the cavity (C) by closing the mold.

Images