JP7369137B2 - Method for manufacturing foam molded product - Google Patents

Description

The present invention relates to a foamed molded article and a method for producing a foamed molded article.

Conventionally, a molded product having through holes has been proposed as a foamed molded product used for a vehicle seat pad (for example, Patent Document 1). According to such a foamed molded article, for example, the foamed molded article can be made lighter and have improved air permeability.

Unexamined Japanese Patent Publication No. 2017-56879

However, the hardness of a foam molded product provided with through holes in this way is lower than that of a foam molded product that does not have the through holes, and the foam molded products provided with the through holes are used, for example, in vehicle seats. When used in a pad, the supporting force for a seated person becomes weak. In order to prevent the hardness of a foam molded product provided with through holes from decreasing, for example, a method can be considered to improve the density or resin hardness of the foam that forms the foam molded product. Body mass may increase and sitting comfort may decrease.

Therefore, the present invention makes it possible to easily obtain a foam molded product that can achieve both air permeability and hardness, and a foam molded product that can achieve both air permeability and hardness of a foam molded product. , an object of the present invention is to provide a method for producing a foam molded article.

The foamed molded article of the present invention is a foamed molded article, and has a support member inside the foamed molded article that extends between the upper surface and the back surface of the foamed molded article, and the foamed molded article has: It is characterized in that a hollow portion is formed that is a through hole or a hole with a bottom that penetrates the foamed molded product.
According to the foam molded article of the present invention, it is possible to achieve both air permeability and hardness of the foam molded article.

In the foamed molded article of the present invention, the support member has a through hole and a bone portion forming the through hole, and the through hole and the bone portion are present in the hollow portion. preferable. According to this configuration, the support member can more effectively reinforce the foam molded body.

In the foam molded article of the present invention, the support member is preferably a mesh, and the opening of the mesh is preferably 1 mm or more. According to this configuration, a foamed molded article can be manufactured more easily.

In the foamed molded article of the present invention, the foamed molded article is a cushion pad having a seating portion for supporting a seated person from below the buttocks, and in a horizontal projection plane of the cushion pad, the foamed molded article has a Preferably, the proportion of the total area of the hollow portion is 30 to 70%. According to this configuration, it is possible to reduce the weight of the foamed molded product, improve air permeability and ride comfort, and also make the hardness of the foamed molded product appropriate.

The method for producing a foam molded article of the present invention is a method for producing a foam molded article, in which the above-mentioned foam molded article is manufactured using a mold having an upper mold and a lower mold,
The mold has a plurality of columnar parts that form a columnar shape between the inner surface of the upper mold and the inner surface of the lower mold when the upper mold and the lower mold are closed,
The columnar part is composed of one columnar part on one side in the axial direction of the columnar part and the other columnar part on the other side in the axial direction of the columnar part,
The mold is closed such that the columnar part sandwiching the support member between the one side columnar part and the other side columnar part is located inside the mold, and the raw material for forming the foam molded article The method is characterized by comprising a step of foaming the resin composition within the mold.
According to the method for producing a foamed molded article of the present invention, a foamed molded article that can achieve both air permeability and hardness can be easily obtained.

According to the present invention, it is possible to easily obtain a foam molded product that can achieve both air permeability and hardness, and a foam molded product that can achieve both air permeability and hardness of a foam molded product. , it is possible to provide a method for producing a foamed molded article.

1 is a perspective view showing a vehicle seat including a cushion pad as a foamed molded article according to an embodiment of the present invention. FIG. 2 is a plan view of the cushion pad of FIG. 1 viewed from above. 3 is a sectional view taken along line AA in FIG. 2, showing a part of the cushion pad in FIG. 1; FIG. FIG. 2 is an enlarged plan view of a portion of the cushion pad of FIG. 1 viewed from above. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram for explaining a method for manufacturing a foamed molded article according to an embodiment of the present invention. 1 is a drawing showing test results regarding heat dissipation properties of foamed molded articles according to Examples and Comparative Examples of the present invention.

The foam molded article of the present invention is suitable for use as a seat pad for supporting a seated person, particularly a vehicle seat pad, and more specifically, a cushion pad or a back pad described below among vehicle seat pads. It is available. Furthermore, when the foam molded article of the present invention is used as a vehicle seat pad, it can be used in any type of vehicle.
Hereinafter, a foamed molded article according to an embodiment of the present invention will be exemplified with reference to the drawings. Common components in each figure are given the same reference numerals. Hereinafter, the vehicle seat pad will also be simply referred to as a "seat pad."

FIG. 1 shows a vehicle seat 100 that includes a foam molded article according to an embodiment of the present invention as a cushion pad 1a. The vehicle seat 100 includes a seat pad 1. As shown by the broken line in FIG. 1, the seat pad 1 includes a cushion pad 1a for a seated person to sit on, and a back pad 1b for supporting the back of the seated person. In addition to the seat pad 1, the vehicle seat 100 includes, for example, an outer skin 101 that covers the front side (seated person side) of the seat pad 1, a frame (not shown) that supports the cushion pad 1a from below, and a back pad 1b. It includes a frame (not shown) installed on the back side and a headrest 102 installed above the back pad 1b to support the head of the seated person. The skin 101 is made of, for example, a material with good air permeability (cloth, etc.). The cushion pad 1a and the back pad 1b are each made of resin foam. The resin foam forming the cushion pad 1a and the back pad 1b is preferably a soft resin foam, and more preferably a soft polyurethane foam. The cushion pad 1a and the back pad 1b can be configured separately from each other.

Below, a case will be described in which the foamed molded product according to the present embodiment is used as the cushion pad 1a instead of the back pad 1b of the seat pad 1. However, the foamed molded article according to the present embodiment is not limited to being used as the cushion pad 1a, but can also be used as the back pad 1b, and furthermore, the use thereof is not limited, and is for use in vehicles. It can also be used for things other than seat pads.
In addition, in this specification, when a foamed molded product is used as the cushion pad 1a, as shown in each drawing, "upper", "lower", and "left" when viewed from the seated person seated on the cushion pad 1a. , "right", "front", and "rear" directions are simply referred to as "up", "down", "left", "right", "front", "rear", etc., respectively.

FIG. 2 is a plan view showing the cushion pad 1a of the seat pad 1 in FIG. 1 when viewed from above. As shown in FIGS. 1 and 2, the cushion pad 1a includes a seating portion (also referred to as a “main pad portion”) 10 for supporting a seated person from below the buttocks, and is located on both left and right sides of the seating portion 10. A pair of side pad portions 20 are configured to swell above the seating portion 10 and support the seated person from both left and right sides, and a pair of side pad portions 20 are located on the rear side of the seating portion 10 and are vertically opposed to the back pad 1b. It has a back pad facing part 30 configured to be arranged.
In the example of FIG. 2, the upper surface (surface) US of the cushion pad 1a has a groove 40a that extends approximately in the front-rear direction between the seating section 10 and the side pad section 20, and a groove 40a that extends between the seating section 10 and the back pad opposing section 30. A groove 40b extending substantially in the left-right direction therebetween, and a groove 40c extending substantially in the left-right direction inside the seating portion 10 are provided, respectively. Inside these grooves 40a, 40b, 40c, for example, fittings (not shown) for attaching the skin 101 (FIG. 1) to the cushion pad 1a are arranged. In the example of FIG. 2, in the horizontal projection plane, the boundary line between the seating part 10 and the side pad part 20 is the groove width center line of the groove 40a between them, and the boundary line between the seating part 10 and the back pad facing part 30 is The boundary line is the groove width center line of the groove 40b between the two.
However, the grooves 40a and 40b may be located at different positions from the boundary line between the seating section 10 and the side pad section 20 and the boundary line between the seating section 10 and the back pad opposing section 30. Further, the grooves 40a to 40c may not be provided on the upper surface US of the cushion pad 1a.

Here, in the present embodiment, the cushion pad 1a (ie, the foamed molded product) is formed with a through hole 50 as a hollow portion that penetrates the cushion pad 1a. Specifically, the through hole 50 has one end and the other end connected to the upper surface US and the back surface BS of the cushion pad 1a (the largest pair of surfaces of the cushion pad, or In the illustrated example, a through hole 50 is formed in the seating portion 10 of the cushion pad 1a.
Since the cushion pad 1a has a hollow portion such as the through hole 50, compared to a case where the cushion pad 1a does not have a hollow portion, the cushion pad 1a is lighter, has improved air permeability, has reduced heat storage, etc. is possible. Reducing the weight of the cushion pad 1a improves the fuel efficiency of the vehicle, which in turn leads to energy savings. Improving the air permeability and reducing heat storage of the cushion pad 1a improves the effectiveness of the air conditioner in the vehicle, which in turn leads to energy savings.

Moreover, in the example of FIG. 2, a plurality of through holes 50 are provided in the cushion pad 1a (specifically, a total of 80 through holes, 10 in the front-rear direction x 8 in the left-right direction). Further, the through holes 50 are arranged in a substantially uniform arrangement pattern, and are arranged at substantially constant pitch intervals in each of the left-right direction and the front-back direction. However, the arrangement pattern of the plurality of through holes 50 may be arbitrary, and may be a non-uniform arrangement pattern.

Further, in the present embodiment, the diameter of each of the through holes 50 in the horizontal projection plane is preferably 5 to 40 mm, and more preferably 8 to 32 mm. Further, in the horizontal projection plane, the area of each through hole 50 is preferably 19 to 1256 mm ² , more preferably 50 to 962 mm ² .
This makes it possible to reduce weight and ensure breathability, as well as improve riding comfort. Moreover, it is possible to prevent the cushion pad 1a from becoming too soft.

Note that the "area" of the through hole 50 in the horizontal projection plane is not the area of the through hole 50 (area of the opening) at a specific vertical position (top surface US, back surface BS, etc.) unless otherwise specified. , is the area of the region occupied by the through hole 50 in the cushion pad 1a when viewed in a horizontal projection plane.
In addition, the "diameter" of the through hole 50 in the horizontal projection plane is not the diameter of the through hole 50 (diameter of the opening) at a specific vertical position (top surface US, back surface BS, etc.) unless otherwise specified. , is the diameter of the area occupied by the through hole 50 in the cushion pad 1a when viewed in a horizontal projection plane. Furthermore, when the hole has a non-circular shape in the horizontal projection plane, the "diameter" of the through hole 50 refers to the diameter of the circumscribed circle of the hole in the horizontal projection plane.

Further, in this embodiment, the shape of the through hole 50 is constant regardless of the vertical position, and is circular (perfect circle) in the illustrated example, but it may also be shaped like an ellipse, a triangle, or a triangle. Polygonal shapes such as quadrangles, rhombuses, trapezoids, etc. are also suitable. Further, in this embodiment, the arrangement pattern, number, diameter, area, shape, etc. of the through holes 50 can be set arbitrarily. In addition, a hole with a bottom (a depression), that is, one end of the hole opens to either surface (top surface US or back surface BS) of the cushion pad 1a, and the other end (bottom) of the hole opens to the cushion pad 1a. It is also possible to provide a hole (hereinafter referred to as a "bottomed hole") which does not open on any surface of the cushion pad 1a and terminates inside the cushion pad 1a. In other words, the hollow portion formed in the cushion pad 1a as a foamed molded product is not limited to the through hole 50, but may be a hole with a bottom. In the present embodiment, only the through hole 50 as an example of the hollow portion will be illustrated, but the same applies when the hollow portion is a hole with a bottom. In addition, when the hollow part is a hole with a bottom, the maximum depth from the opening of the hole to the bottom is 30% or more and less than 100% of the thickness of the cushion pad 1a at the position where the hole with a bottom is formed. It is preferable. Further, the above-mentioned definition of "the area of the through hole" is the same even when a bottomed hole is provided as the hollow part. Furthermore, the above-mentioned definition of "the diameter of the through hole" is the same even when a bottomed hole is provided as the hollow part.

Here, as shown in FIG. 3, which is a sectional view taken along line AA in FIG. It has a support member 60 extending between the top surface US and the back surface BS of 1a. Specifically, in the present embodiment, the support member 60 has a plurality of through holes 50 in the cushion pad 1a, which are arranged substantially parallel to the upper surface US and the back surface BS of the cushion pad 1a in the front-rear direction and the left-right direction of the cushion pad 1a. It extends across the
As described above, since the cushion pad 1a has the support member 60, even if the cushion pad 1a is provided with the through hole 50 (or a hole with a bottom), the support member 60 reinforces the cushion pad 1a. It is possible to prevent the hardness of the cushion pad 1a from decreasing significantly, and therefore, it is possible to achieve both breathability and hardness of the cushion pad 1a.

Examples of the support member 60 include, but are not limited to, a through hole, specifically, a through hole penetrating between one surface and the other surface of the support member 60, and a bone portion forming the through hole. Specific examples include woven fabrics, meshes, nonwoven fabrics, etc. Further, the material of the bone portion of the support member 60 is not particularly limited, and examples thereof include polyamide, polyester, polyolefin, polypropylene, polyethylene terephthalate, acrylic, etc. The bone portion may be made of fiber.
In this embodiment, the support member 60 is preferably a mesh, and the mesh preferably has an opening of 1 mm or more. More preferably, the opening is 3 mm or more. Thereby, when the cushion pad 1a is formed by arranging the support member 60 in a mold as described later, it is possible to manufacture the cushion pad 1a more easily.
Further, the opening of the support member 60 is preferably 50 mm or less, more preferably 25 mm or less. Thereby, the strength of the support member 60 can be ensured. Further, as described later, when manufacturing the cushion pad 1a by sandwiching the support member 60 between the columnar parts of the mold, it is necessary to ensure that the support member 60 is sandwiched between the tips of the columnar parts. I can do it.

In this embodiment, when the support member 60 has a through hole and a bone portion forming the through hole, as shown in FIGS. 3 and 4, the through hole and the bone portion are provided in the through hole 50 of the cushion pad 1a. It is preferable that Specifically, the support member 60 is also present around the through hole 50 , and a part of the through hole and bone portion of the support member 60 are present within the through hole 50 , and the through hole 50 is connected to the support member 60 . Preferably, it penetrates through a through hole.
In this way, in the cushion pad 1a, the through hole 50 penetrates through the support member 60, so that the support member 60 can more effectively reinforce the cushion pad 1a.

In this embodiment, from the viewpoint of not causing discomfort when sitting, the position of the support member 60 in the thickness direction of the cushion pad 1a is set from the back surface of the cushion pad 1a in the thickness direction of the cushion pad 1a. The positions are preferably separated by 20 to 60% of the thickness T, more preferably 30 to 40% apart.
Moreover, in this embodiment, as shown in FIG. 2, the support member 60 can be present in a wide range of the cushion pad 1a when viewed from above of the cushion pad 1a. Specifically, in the illustrated example, the support member 60 is within the range of the seating portion 10, and is located within the majority of the seating portion 10 (rather than the area within the cushion pad 1a where all the through holes 50 are present). exists in a wide range). By making it exist in such a range, the hardness of the cushion pad 1a can be effectively maintained.
Note that the support member 60 may be present only in a part of the cushion pad 1a when viewed from the top of the cushion pad 1a. In addition, the support member 60 is located at a rear portion (lower buttock) of the seating portion 10 than a boundary position that is 55% of the total length of the seating portion 10 in the front-rear direction from the frontmost position of the seating portion 10. ) is preferably provided at least.

Further, although only one support member 60 is provided in the illustrated example, two or more support members 60 may be provided.

By the way, when a foamed molded product is used as the cushion pad 1a as in the present embodiment, the total area of the hollow portion constituted by the through hole 50 or the bottomed hole with respect to the entire area of the seating portion 10 is Preferably, the proportion is 30 to 70%. Further, the ratio is more preferably 40 to 60%. By setting the ratio to 30% or more, it is possible to easily reduce the weight of the cushion pad 1a and improve breathability, and the cushion pad 1a can be made to have an appropriate hardness, so that when the seated person is seated, The comfort of sitting can be improved.
Moreover, by setting the ratio to 70% or less, it becomes easier to arrange the support member 60 in the mold, and it becomes easier to mold the cushion pad 1a.

Next, a method for manufacturing a foamed molded article according to an embodiment of the present invention will be described using FIG. 5.
FIG. 5 is an explanatory diagram for explaining a method for manufacturing a foam molded body according to an embodiment of the present invention, and specifically, a raw resin composition for forming a foam molded body is placed in a mold 70. FIG. 2 is a schematic cross-sectional view showing a mold 70 before the resin composition is injected in the step of injecting the resin composition.

In the method for manufacturing a foamed molded article of this embodiment, the foamed molded article (cushion pad) of this embodiment described above is manufactured using a mold 70 having an upper mold 71 and a lower mold 72. Specifically, the mold 70 used in the manufacturing method of this embodiment has a columnar shape between the inner surface of the upper mold 71 and the inner surface of the lower mold 72 with the upper mold 71 and the lower mold 72 closed. It has a plurality of columnar parts 73, and the inner surface of the upper mold 71 and the inner surface of the lower mold 72 are the upper and back surfaces of the foam molded article (in this example, the inner surface of the upper mold 71 of the mold 70 is the foam molded body). The back surface side of the body and the inner surface side of the lower mold 72 become the upper surface side of the foamed molded product), and the columnar portions 73 form the through holes of the foamed molded product.
Moreover, as shown in FIG. 5, the columnar part 73 is composed of one side columnar part 711 on one axial side of the columnar part 73 and the other side columnar part 721 on the other axial side of the columnar part 73, When manufacturing a foamed molded article, the one-side columnar portion 711 and the other-side columnar portion 721 are positioned in the mold 70 so that their respective tips face each other. In this example, the one side columnar portion 711 and the other side columnar portion 721 are separate from the upper mold 71 and the lower mold 72, but the one side columnar portion 711 and the other side columnar portion 721 are attached to the mold 70. It may be an integral body integrally molded on the inner surfaces of the upper mold 71 and the lower mold 72.

In the method for manufacturing a foamed molded article of the present embodiment, the mold 70 is positioned such that the columnar part 73 sandwiching the support member 60 between the columnar part 711 on one side and the columnar part 721 on the other side is located inside the mold 70. The raw resin composition for forming the foamed molded product is foamed in the mold 70 (in other words, when the raw resin composition is foamed in the mold 70, the one side columnar portion 711 and the other side columnar portion 721 are located inside the closed mold 70 with the support member 60 sandwiched therebetween), thereby producing a foam molded article having the support member 60. be able to.
By doing so, a through hole can be formed by the columnar portion 711 on one side and the columnar portion 721 on the other side, and furthermore, the support member 60 can be prevented from shifting or twisting due to foaming of the raw resin composition. This can be prevented. By preventing misalignment, etc., the foamed molded product can be appropriately reinforced by the support member 60, and it is possible to achieve both air permeability due to the through holes 50 of the foamed molded product and hardness of the foamed molded product. can.
Note that the "raw resin composition" herein refers not only to a resin composition before foaming is started, but also to a resin composition that has been foamed to some extent.

Specifically, in this example, the raw resin composition is in a state in which the columnar part 73 with the support member 60 sandwiched between the columnar part 711 on one side and the columnar part 721 on the other side is located on the inner surface of the mold 70. And it's injected. In this example, more specifically, on the inner surface of the upper mold 71 or the lower mold 72 (lower mold 72 in the illustrated example), the columnar part 73 and the support member 60 are placed on one side of the columnar part 711 and the other side of the columnar part 711 and the other side columnar part. The support member 60 is placed between the parts 721, and then the columnar part 73 is placed inside the mold 70 (inside the upper mold 71 or the lower mold 72, in the illustrated example). The raw resin composition is injected into the lower mold 72), and the upper mold 71 and the lower mold 72 are closed (the columnar part 73 with the support member 60 sandwiched between the columnar part 711 on one side and the columnar part 721 on the other side) The mold 70 is closed so as to be located inside the mold 70). Then, the resin composition is foamed within the mold 70.
In this way, the raw resin composition is injected while the support member 60 is fixed to the inside of the mold 70 (in this example, the columnar part 73). However, it can prevent misalignment or twisting.

Note that in this example, the raw resin composition is injected and the upper mold 71 and the lower mold 72 are closed, but a raw material injection port for injecting the raw resin composition is provided in the upper mold 71 or the lower mold 72. In the above, the raw resin composition can also be injected through the raw material injection port after the upper mold 71 and the lower mold 72 are closed. Further, as described above, in this example, the one side columnar portion 711 and the other side columnar portion 721 are separate from the upper mold 71 and the lower mold 72, but the one side columnar portion 711 and the other side columnar portion 721 are separate from the upper mold 71 and the lower mold 72. After arranging the support member 60 on the other side columnar portion 721 of the lower mold 72 as an integral part integrally molded on the inner surface of the upper mold 71 of the mold 70, the upper mold 71 and the lower mold 72 are closed ( The columnar part 73 sandwiching the support member 60 between the columnar part 711 on one side and the columnar part 721 on the other side is located on the inner surface of the mold 70), the raw material provided in the upper mold 71 or the lower mold 72 The raw resin composition can also be injected through an injection port.
Further, in this example, the raw resin composition is injected while the columnar part 73 with the support member 60 sandwiched between the columnar part 711 on one side and the columnar part 721 on the other side is located on the inner surface of the mold 70. However, the support member 60 is arranged at the tip of the other side columnar part 721 (or the one side columnar part 711), and the support member 60 is placed in the mold 70 (lower mold 72, upper mold 71, columnar part 73, etc.). After the resin composition is fixed, the raw resin composition may be injected, and the one side columnar portion 711 (or the other side columnar portion 721) may be arranged. Furthermore, the raw resin composition may be injected into the mold 70 before placing the columnar part 73, and then the columnar part 73 and the support member 60 may be placed in the mold.
Further, the raw resin composition for forming the above-mentioned foam molded product is not particularly limited, but polyurethane is preferable, for example. Therefore, the foamed molded article to be produced is preferably polyurethane foam.

Although the embodiments of the present invention have been described above with reference to the drawings, the foam molded article and the method for manufacturing the foam molded article of the present invention are not limited to the above examples, and the foam molded article and The method for producing the foamed molded product can be modified as appropriate.

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to the following Examples.

(Example 1)
The foamed molded product of Example 1 was a cushion pad, and a foamed molded product as shown in FIG. 2 was produced. Specifically, the foamed molded product of Example 1 was formed of flexible urethane foam, and the thickness of the foamed molded product was 80 mm. The foam molded article was provided with 80 through holes each having a diameter of 15 mm and an area of 177 mm ² in a horizontal projection plane. Note that the through hole penetrates through the support member. In addition, the support member uses a mesh made of polyethylene fibers with an opening of 4 mm, and the support member is positioned from the back side of the foam molding in the thickness direction of the cushion pad. They are spaced apart by 50% of their thickness. The foam molded product of Example 1 was evaluated as described below, and the results are shown in Table 1.

(Comparative example 1)
As a foam molded product of Comparative Example 1, a foam molded product that was the same as the foam molded product of Example 1 above was produced except that it did not have a through hole and a support member. The foam molded product of Comparative Example 1 was evaluated as described below, and the results are shown in Table 1.

(Comparative example 2)
As a foam molded product of Comparative Example 2, a foam molded product that was the same as the foam molded product of Example 1 above was produced except that it did not have a support member. The foam molded product of Comparative Example 2 was evaluated as described below, and the results are shown in Table 1.

(hardness)
The hardness of the foam molded products of Examples and Comparative Examples was measured at 25% hardness in accordance with JIS K6400-1 D method.

(mass)
The mass of the foamed molded products of Examples and Comparative Examples was measured, and each mass was evaluated using an index with the foamed molded product of Comparative Example 1 set as 100. The results obtained are shown in Table 1.

(Static spring constant)
The static spring constant of the foam molded products of Example 1 and Comparative Examples 1 and 2 is the value of the tangent of the tangent to the pressure side curve at a load of 600 N on the load-deflection curve measured in accordance with JIS K6400-2 E method. It is.

(heat dissipation)
The heat dissipation properties of the foam molded products of Example 1 and Comparative Examples 1 and 2 were determined by the difference between the atmosphere and the foam molding when the atmosphere around the foam molded products obtained in Example and Comparative Examples was changed from high temperature to low temperature. Evaluation was made by measuring changes in body temperature. Specifically, the foamed molded product was placed in a constant temperature bath with an ambient temperature of 60°C, and left until the temperature of the foamed molded product became constant at 60°C. After the temperature of the foamed molded product became constant at 60°C, the ambient temperature in the constant temperature bath was changed from 60°C to 25°C, and the temperature change in the ambient temperature and the temperature change of the foamed molded product at that time were measured. . The temperature of the foamed molded product was measured using a thermocouple at the center of the seating portion (the center in the horizontal projection plane and the center in the thickness direction of the central portion) when used as a cushion pad. The temperature change of the foamed molded product was obtained as shown in the graph of FIG. 6, which shows the temperature change of the atmosphere, and the temperature change of the foamed molded products of Example 1 and Comparative Examples 1 and 2. The temperature change of the atmosphere and the temperature change of the foamed molded body were evaluated based on the following criteria. The evaluation results are shown in Table 1.
○: Easier to follow the ambient temperature than Comparative Example 1 △: Equivalent to Comparative Example 1 ×: Difficult to follow the ambient temperature than Comparative Example 1

According to the present invention, it is possible to easily produce a foam molded product that can achieve both air permeability and hardness, and a foam molded product that can achieve both air permeability and hardness of a foam molded product. It is possible to provide a method for producing a foamed molded article.

100: Vehicle seat, 1: Seat pad,
1a: Cushion pad (foam molded product), 1b: Back pad, 101: Epidermis,
102: headrest, 10: seating section, 20: side pad section,
30: Back pad opposing part, 40a to 40c: Groove, 50: Through hole (hollow part),
60: support member, 70: mold, 71: upper mold, 72: lower mold, 73: columnar part,
711: One side columnar part, 721: Other side columnar part, US: Top surface, BS: Back surface,
T: Thickness

Claims (4)

A method for manufacturing a foam molded article, the method comprising manufacturing a foam molded article using a mold having an upper mold and a lower mold,
The foamed molded product has a support member extending between the top surface and the back surface of the foamed molded product inside , and a hollow portion that is formed of a through hole or a bottomed hole that penetrates the foamed molded product. is formed ,
The mold has a plurality of columnar parts that form a columnar shape between the inner surface of the upper mold and the inner surface of the lower mold when the upper mold and the lower mold are closed,
The columnar part is composed of one columnar part on one side in the axial direction of the columnar part and the other columnar part on the other side in the axial direction of the columnar part,
The mold is closed such that the columnar part sandwiching the support member between the one side columnar part and the other side columnar part is located inside the mold, and the raw material for forming the foam molded article A method for producing a foamed molded article, comprising the step of foaming a resin composition in the mold . The support member has a through hole and a bone portion forming the through hole,
The method for manufacturing a foam molded article according to claim 1, wherein the through hole and the bone portion are present in the hollow portion. The method for manufacturing a foam molded article according to claim 2, wherein the support member is a mesh, and the mesh has an opening of 1 mm or more. The foam molded article is a cushion pad having a seating portion for supporting a seated person from below the buttocks,
The method for producing a foam molded article according to claim 1, wherein the ratio of the total area of the hollow portion to the total area of the seating portion in the horizontal projection plane of the cushion pad is 30 to 70%.

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