JP2020172076A - Method for manufacturing seat pad, seat pad, and three-dimensional modelling data - Google Patents

Abstract

To provide a method for manufacturing a seat pad capable of easily manufacturing the seat pad having a fluid passage, the seat pad, and three-dimensional modeling data.SOLUTION: A method for manufacturing a seat pad manufactures a seat pad 302 composed of a porous structure 1, and includes a modelling step for modelling the seat pad using a three-dimensional printer. The porous structure is composed of a flexible resin or rubber. The seat pad has a fluid passage 5 for allowing a fluid to pass from a first opening 51 that opens to the outer surface of the seat pad to a second opening 52 that opens to the outer surface of the seat pad while being extended inside the seat pad. The second opening of the fluid passage opens to a surface FS on a seating person side of the seat pad.SELECTED DRAWING: Figure 2

Description

The present invention relates to a method for manufacturing a seat pad, a seat pad, and data for 3D modeling.

Conventionally, a seat pad has been manufactured through a step of foaming by a chemical reaction, for example, in mold molding or the like (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-44292

However, when the seat pad is manufactured through the step of foaming by a chemical reaction as described above, a fluid passage extending inside the seat pad (hereinafter, hereinafter, between a plurality of openings opened on the outer surface of the seat pad). It is difficult to form a "fluid passage").

An object of the present invention is to provide a method for manufacturing a seat pad, a seat pad, and data for 3D modeling, which can easily manufacture a seat pad having a fluid passage.

The method for manufacturing the seat pad of the present invention
A method for manufacturing a seat pad composed of a porous structure.
Includes a modeling step of modeling the seat pad using a 3D printer.
The porous structure is made of a flexible resin or rubber.
The seat pad is for fluid to pass from a first opening that opens to the outer surface of the seat pad to a second opening that extends inside the seat pad and opens to the outer surface of the seat pad. Has a fluid passage and
The second opening of the fluid passage is open to the seater-side surface of the seat pad.
According to the method for manufacturing a seat pad of the present invention, a seat pad having a fluid passage can be easily manufactured.

In the method for manufacturing a seat pad of the present invention
It is preferable that the fluid passage has a plurality of branch passages.
As a result, temperature control and the like can be performed more effectively.

In the method for manufacturing a seat pad of the present invention
It is preferable that each of the plurality of branch aisles has the second opening that opens to the seater-side surface of the seat pad.
As a result, temperature control and the like can be performed more effectively.

In the method for manufacturing a seat pad of the present invention
The seat pad is configured as a cushion pad.
The cushion pad has a lower buttock configured to support the buttock portion of the seated person from below.
It is preferable that the second opening of the fluid passage is open to the seater-side surface of the lower buttock.
As a result, temperature control and the like can be performed more effectively.

In the method for manufacturing a seat pad of the present invention
The seat pad is configured as a back pad.
The back pad has a main pad portion configured to support the back of the seated person from the rear side.
It is preferable that the second opening of the fluid passage is open to the seater-side surface of the main pad portion.
As a result, temperature control and the like can be performed more effectively.

In the method for manufacturing a seat pad of the present invention
It is preferable that the first opening of the fluid passage is open to a surface of the outer surface of the seat pad other than the surface on the seater side.
Thereby, for example, it is possible to prevent the outlet of the air conditioner from interfering with the seated person.

In the method for manufacturing a seat pad of the present invention
The porous structure includes a skeleton portion and has a skeleton portion.
The skeleton is
With multiple bones
A plurality of joints, each of which connects the ends of the plurality of bones,
Consists of
The skeleton portion has a cell partition portion that internally partitions the cell hole.
Each of the cell compartments has a plurality of annular portions configured in an annular shape.
The plurality of annular portions are connected to each other so that the virtual surfaces partitioned by the respective inner peripheral side edges do not intersect with each other.
The cell hole is partitioned by the plurality of annular portions and the plurality of virtual surfaces on which the plurality of annular portions are partitioned.
It is preferable that the annular portion is composed of the plurality of the bone portions and the plurality of the joint portions.
As a result, the cushioning property of the seat pad can be improved.

The seat pad of the present invention
A seat pad composed of a porous structure.
The seat pad was modeled using a 3D printer.
The porous structure is made of a flexible resin or rubber.
The seat pad is for fluid to pass from a first opening that opens to the outer surface of the seat pad to a second opening that extends inside the seat pad and opens to the outer surface of the seat pad. Has a fluid passage and
The second opening of the fluid passage is open to the seater-side surface of the seat pad.
According to the seat pad of the present invention, a seat pad having a fluid passage can be easily manufactured.

In the seat pad of the present invention
The porous structure includes a skeleton portion and has a skeleton portion.
The skeleton is
With multiple bones
A plurality of joints, each of which connects the ends of the plurality of bones,
Consists of
It is preferable that the cross-sectional shape of the bone portion is circular or polygonal.
Thereby, the characteristics of the porous structure as a cushioning material can be improved.

In the seat pad of the present invention
The porous structure includes a skeleton portion and has a skeleton portion.
The skeleton is
With multiple bones
A plurality of joints, each of which connects the ends of the plurality of bones,
Consists of
The bone portion has, in at least a part thereof, a bone constant portion extending while maintaining a constant cross-sectional area.
The ratio A0 / A1 of the cross-sectional area A0 of the fixed bone portion to the cross-sectional area A1 of one end of the bone portion is
0.15 ≤ A0 / A1 ≤ 2.0
It is preferable to satisfy.
As a result, the touch feeling on the surface of the porous structure can be made moderately hard as a characteristic of the seat pad.

The 3D modeling data of the present invention is
This is 3D modeling data that is read into the control unit of the 3D printer when the modeling unit of the 3D printer performs modeling.
The control unit is configured to cause the modeling unit to model the seat pad.
According to the 3D modeling data of the present invention, a seat pad having a fluid passage can be easily manufactured.

According to the present invention, it is possible to provide a method for manufacturing a seat pad, a seat pad, and data for 3D modeling, which can easily manufacture a seat pad having a fluid passage.

It is a perspective view which shows schematicly the seat for the vehicle which can be provided with the seat pad which concerns on any Embodiment of this invention. It is a perspective view which shows the example of the seat pad which concerns on 1st Embodiment of this invention which was configured as a cushion pad. It is a front-back direction (extending direction) cross-sectional view which shows the cushion pad of FIG. 2 by the cross section along the line I-I of FIG. It is a perspective view which shows the example of the seat pad which concerns on 1st Embodiment of this invention which was configured as a back pad. It is a cross-sectional view in the extending direction which shows the back pad of FIG. 4 by the cross section along the line KK of FIG. It is a perspective view which shows a part of an example of the porous structure which can form the seat pad which concerns on 1st Embodiment of this invention. It is a view of the arrow A which shows the state when the porous structure of FIG. 6 is seen from the direction of the arrow A of FIG. It is a B arrow view which shows the state when the porous structure of FIG. 6 is seen from the direction of the B arrow of FIG. It is a perspective view which shows the cell section part of the porous structure of FIG. FIG. 9 is a drawing corresponding to FIG. 9, and is a drawing for explaining a modification of a cell compartment. It is a drawing for demonstrating the manufacturing method of the seat pad which concerns on one Embodiment of this invention which can be used for manufacturing the seat pad which concerns on any Embodiment of this invention. It is a front-back direction (extending direction) cross-sectional view which shows the cushion pad which consisted of the example of the seat pad which concerns on 2nd Embodiment of this invention by the cross section along the line I-I of FIG. FIG. 5 is a cross-sectional view in the extending direction showing a back pad composed of an example of a seat pad according to a second embodiment of the present invention by a cross section taken along the line KK of FIG. It is a front-rear direction (extending direction) cross-sectional view which shows the cushion pad which consisted of the example of the seat pad which concerns on 3rd Embodiment of this invention by the cross section along the line I-I of FIG. FIG. 5 is a cross-sectional view in the extending direction showing a back pad composed of an example of a seat pad according to a third embodiment of the present invention by a cross section taken along the line KK of FIG. It is a perspective view which shows a part of the porous structure which constitutes the seat pad which concerns on 3rd Embodiment of this invention. It is a D arrow view which shows the state when the C part of the porous structure of FIG. 16 is seen from the direction of the D arrow of FIG. It is an E arrow view which shows the state when the C part of the porous structure of FIG. 16 is seen from the direction of the E arrow of FIG. It is a top view which shows a part of the porous structure which constitutes the seat pad which concerns on 4th Embodiment of this invention. 20 (a) is a perspective view showing a bone portion of the porous structure of FIG. 19 in a state where no external force is applied, and FIG. 20 (b) is a perspective view showing a bone portion of the porous structure of FIG. 19 in a state where an external force is applied. It is a perspective view which shows the bone part of.

The seat pad manufacturing method, seat pad, and 3D modeling data of the present invention are preferably used for any vehicle seat and any vehicle seat pad, and in particular, a vehicle seat and a vehicle seat pad. It is suitable to be used in.

Hereinafter, a method for manufacturing a seat pad, a seat pad, and an embodiment of 3D modeling data according to the present invention will be illustrated and described with reference to the drawings.
The components common to each figure are designated by the same reference numerals.

[Seat pad according to the first embodiment]
The seat pad 302 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5.
FIG. 1 is a perspective view schematically showing an example of a vehicle seat 300 provided with a seat pad 302 that can be composed of the porous structure 1 according to various embodiments of the present invention.
As shown by the broken line in FIG. 1, the vehicle seat 300 includes a cushion pad 310 for the seated person to sit on, and a back pad 320 for supporting the back of the seated person. The cushion pad 310 and the back pad 320 are each composed of a seat pad 302. Hereinafter, the cushion pad 310 or the back pad 320 may be simply referred to as a "seat pad 302". The cushion pad 310 and the back pad 320 can each be composed of the porous structure 1 of any example described later. The porous structure 1 has a large number of cell holes. The vehicle seat 300 supports, for example, the skin 330 that covers the front side (seat side) of the seat pad 302 and the cushion pad 310 from below, in addition to the seat pad 302 that constitutes each of the cushion pad 310 and the back pad 320. A frame (not shown), a frame (not shown) installed on the back side of the back pad 320, and a headrest 340 installed on the upper side of the back pad 320 to support the head of the seated person. Can be prepared. The skin 330 is made of, for example, a highly breathable material (cloth or the like). In the example of FIG. 1, the cushion pad 310 and the back pad 320 are configured separately from each other, but may be configured integrally with each other.
Further, in the example of FIG. 1, the headrest 340 is configured separately from the back pad 320, but the headrest 340 may be configured integrally with the back pad 320.
In the present specification, as shown in FIGS. 1 to 5, "upper", "lower", "left", and "right" when viewed from a seated person seated on the vehicle seat 300 (and thus the seat pad 302). , "Front" and "rear" are simply referred to as "up", "down", "left", "right", "front", "rear" and the like.

Hereinafter, for convenience of explanation, the cushion pad 310 and the back pad 320 including the seat pad 302 according to the first embodiment will be described together.

2 and 3 show an example of a cushion pad 310 including the seat pad 302 according to the first embodiment. FIG. 2 is a perspective view of the cushion pad 310 when viewed from above, and FIG. 3 shows the cushion pad 310 of FIG. 2 extending in the front-rear direction (also the extending direction LD of the cushion pad 310). It is shown by a cross section along the line I-I of FIG. As shown in FIGS. 2 and 3, the cushion pad 310 is located on the left and right sides of the main pad portion 311 configured to support the buttocks and thighs of the seated person from below, and the main pad portion 311. , A pair of side pad portions 312, which are configured to swell upward from the main pad portion 311 and support the seated person from both left and right sides, and are located on the rear side of the main pad portion 311 and vertically with the back pad 320. It has a back pad facing portion 313, which is configured to face each other. The main pad portion 311 is located on the rear side with respect to the lower thigh 311t and the lower thigh 311t, which are configured to support the thigh of the seated person from the lower side, and supports the buttocks of the seated person from the lower side. It consists of a lower buttock 311h configured to do so.

4 and 5 show an example of the back pad 320 including the seat pad 302 according to the first embodiment. FIG. 4 is a perspective view of the back pad 320 when viewed from the front side, and FIG. 5 is a line KK of FIG. 4 extending the back pad 320 of FIG. 4 in the extending direction LD of the back pad 320. It is shown by the cross section along. As shown in FIGS. 4 and 5, the back pad 320 is located on both the left and right sides of the main pad portion 321 configured to support the back of the seated person from the rear side and the main pad portion 321. It has a pair of side pad portions 322 that swell to the front side of 321 and are configured to support the seated person from both the left and right sides.

In the present specification, the "extending direction (LD) of the seat pad (302)" (hereinafter, also simply referred to as "extending direction (LD)") refers to the lateral direction and the thickness direction (TD) of the seat pad 302. ), In the case of the cushion pad 310, it points in the front-rear direction (FIGS. 2 and 3), and in the case of the back pad 320, from the lower surface to the upper surface of the main pad portion 321 of the back pad 320. The main pad portion 321 points in the extending direction (FIGS. 4 and 5).
Further, the "thickness direction (TD) of the seat pad (302)" (hereinafter, also simply referred to as "thickness direction (TD)") refers to the vertical direction in the case of the cushion pad 310 (FIG. 2). In the case of the back pad 320, the main pad portion 321 extends from the seater-side surface (front surface) FS of the main pad portion 321 of the back pad 320 to the back surface BS (FIGS. 4 and 3). 5).
Further, the "seat side surface (surface, FS)" of the seat pad (302) refers to the upper surface in the case of the cushion pad 310 (FIGS. 2 and 3) and the front surface in the case of the back pad 320. (Fig. 4 and Fig. 5). The “back surface (BS)” of the seat pad (302) is the surface of the seat pad (302) opposite to the seating side surface (FS), and in the case of the cushion pad 310, it refers to the lower surface (FIG. 2 and FIG. 3), in the case of the back pad 320, it points to the rear surface (FIGS. 4 and 5). The "side surface (SS)" of the seat pad (302) is the surface between the seated side surface (FS) and the back surface (BS) of the seat pad (302), and in the case of the cushion pad 310, the front surface and the rear surface. , Left surface and right surface (FIGS. 2 and 3), and in the case of the back pad 320, it refers to any one of the lower surface, the upper surface, the left surface and the right surface (FIGS. 4 and 5).

In the example of FIG. 2, a plurality of cushion pads 310 extend in the substantially front-rear direction (extending direction LD) and are separated from each other in the left-right direction on the surface FS on the seater side (in the example of the figure). , 2) grooves Ga, and one or more (two in the example of the figure) grooves Gb extending substantially in the left-right direction. In the example of FIG. 2, the two grooves Ga extending in the substantially anteroposterior direction (extending direction LD) form a boundary between the main pad portion 311 and the side pad portion 312, respectively, and form a boundary in the substantially left-right direction. Of the two grooves Gb extending in the right direction, the groove Gb located on the front side forms a boundary between the lower thigh 311t and the lower buttock 311h, and the two grooves extend substantially in the left-right direction. Of the grooves Gb, the groove Gb located on the rear side forms a boundary between the lower tail portion 311h (by extension, the main pad portion 311) and the back pad facing portion 313. However, grooves Ga and Gb may be formed on the seater-side surface FS of the cushion pad 310 in a form different from that shown in FIG. Further, the boundary between the lower thigh 311t, the lower buttock 311h, the side pad portion 312, and the back pad facing portion 313 of the cushion pad 310 may be at a position different from the positions of the grooves Ga and Gb.
In the example of FIG. 4, a plurality of back pads 320 extend in the substantially extending direction LD and are separated from each other in the left-right direction on the surface FS on the seater side (two in the example of the figure). It has one or more grooves Gb (one in the example of the figure) extending substantially in the left-right direction. In the example of FIG. 4, the two grooves Ga extending in the substantially extending direction LD form a boundary between the main pad portion 321 and the side pad portion 322, respectively. However, grooves Ga and Gb may be formed on the seated side surface FS of the back pad 320 in a form different from that in FIG. Further, the surface FS on the seater side of the back pad 320 may not be provided with a groove Gb extending substantially in the left-right direction. Further, the boundary between the main pad portion 321 and the side pad portion 322 of the back pad 320 may be at a position different from the position of the groove Ga.
In these grooves Ga and Gb, for example, a fitting for attaching the skin 330 (FIG. 1) is provided.

As described above, the seat pad 302 is composed of the porous structure 1. The seat pad 302 is modeled by a 3D printer. The method for manufacturing the seat pad 302 will be described in detail later with reference to FIG. By manufacturing the seat pad 302 using a 3D printer, the manufacturing becomes simpler and the desired configuration can be obtained as compared with the case of undergoing the step of foaming by a chemical reaction as in the conventional case. In addition, it is expected that future technological advances in 3D printers will make it possible to realize manufacturing with 3D printers in a shorter time and at lower cost. Further, by manufacturing the seat pad 302 using a 3D printer, it is possible to easily and as expected the configuration of the seat pad 302 corresponding to various required characteristics.

The porous structure 1 is made of a flexible resin or rubber.
Here, the "flexible resin" refers to a resin that can be deformed when an external force is applied. For example, an elastomer-based resin is preferable, and polyurethane is more preferable. Examples of the rubber include natural rubber and synthetic rubber. Since the porous structure 1 is made of a flexible resin or rubber, it can be compressed / restored and deformed according to the application / release of an external force from the seated person, and thus has cushioning properties. Can be done.
From the viewpoint of ease of manufacture by a 3D printer, the porous structure 1 is more preferably made of a flexible resin than that of a rubber. ..
Further, from the viewpoint of ease of production by a 3D printer, it is preferable that the entire porous structure 1 is made of a material having the same composition. However, the porous structure 1 may be composed of materials having different compositions depending on the site.

The suitable cell structure of the porous structure 1 will be described in detail later with reference to FIGS. 6 to 10 and the like.

As shown in FIGS. 2 to 5, the seat pad 302 (cushion pad 310, back pad 320) of the first embodiment is a fluid between a plurality of openings 51, 52 that open on the outer surface of the seat pad 302. It has a fluid passage 5 for passing through. More specifically, the fluid passage 5 extends inside the seat pad 302 from one or more first openings 51 that open to the outer surface of the seat pad 302 and opens to the outer surface of the seat pad 302. It reaches up to one or a plurality of second openings 52. The second opening 52 opens on the seating side surface FS of the seat pad 302. The first opening 51 may be arranged at an arbitrary position on the outer surface of the seat pad 302, but it is preferable that the first opening 51 is opened on a surface other than the surface FS on the seater side of the outer surface of the seat pad 302.
Here, the "outer surface" of the seat pad 302 includes the surface FS on the seater side, the back surface BS, and the side surface SS of the seat pad 302, and the groove Ga provided on the surface FS on the seater side. , Also includes the sides and bottom of Gb. Therefore, the second opening 52 may be opened on the side surface and / or the bottom surface of the grooves Ga and Gb provided on the surface FS on the seater side.
The fluid passage 5 is partitioned by the porous structure 1 constituting the seat pad 302, and the inside of the fluid passage 5 is hollow.
The fluid passage 5 can be suitably used, for example, to pass air (hot air, cold air, etc.) from an air conditioner (not shown) in the vehicle. In this case, it is preferable that the first opening 51 is connected to the outlet of the air conditioner and is used as an inlet for the air from the air conditioner to flow in, and the second opening 52 is used as an outlet. Further, the fluid passage 5 does not have to be connected to the air conditioner, and may be used so that ventilation is performed by naturally passing air between the openings 51 and 52, for example.

More specifically, in the example of the cushion pad 310 (seat pad 302) shown in FIGS. 2 to 3, the fluid passage 5 has one first opening 51 and a plurality (specifically, 10) second fluid passages 5. It has an opening 52, and extends inside the seat pad 302 from the first opening 51 to each of the second openings 52. The first opening 51 opens to the front surface of the side surface SS of the seat pad 302. Each of the second openings opens on the seater-side surface FS of the lower buttock 311h of the seat pad 302.
In this example, the fluid passage 5 includes a main passage 53 that extends continuously from the first opening 51 toward the second opening 52 side, and one or more branch points P on the main passage 53 (hereinafter, "" It has one or a plurality of branch portions 56 branched from each of the first branch points P1 ”). In the example of the figure, the fluid passage 5 has a first branch point P1 at a plurality of different positions (two in the example of the figure) in the extending direction of the main passage 53, and has a branch portion 56. It has a plurality (two in the example of the figure). In the example of the figure, the passage 53 extends in the substantially extending direction LD (substantially the front-rear direction).
Here, the "branch point (P, P1, P2)" refers to a point (starting point of branching) in the fluid passage 5 where one passage branches into a plurality of passages.
Each branch 56 has one or more (five in the example of the figure) branch passages 54, respectively. Each branch passage 54 has a second opening 52, respectively. Here, in this example, each branch passage 54 is a terminal passage including the second opening 52 of the branch portion 56, and specifically, for example, another branch passage P1 as a starting point. Of the other branch points P that extend to the second opening 52 without passing through the branch point P, or are located on the second opening 52 side of the first branch point P1 in the fluid passage 5. Starting from the branch point P on the side of the second opening 52 (in the example of the figure, the second branch point P2), it extends to the second opening 52. When there is another branch point P (in the example of the figure, the second branch point P2) between the first branch point P1 and the branch passage 54, the first branch point P1 and the other branch point P are between. The intermediate passage 55 extends.
In the example of FIG. 2, the plurality of (five in the example of the figure) branch passages 54 constituting the branch portion 56 intersect (for example, orthogonal to) the main passage 53 in the plan view of the seat pad 302 (example of the figure). Then, they are arranged along the left-right direction).
Here, the "plan view of the seat pad 302" refers to a plan view when the seat pad 302 is viewed perpendicularly to the surface FS on the seater side of the seat pad 302.
Of the plurality of (five in the example of the figure) branch passages 54 constituting the branch portion 56, one branch passage 54a is TD in the substantially thickness direction from the first branch point P1 toward the seater side (upper side). It extends in the vertical direction) and reaches the second opening 52. Further, in the branch portion 56, a pair of intermediate passages 55 extend from the first branch point P1 toward both left and right sides, and there is a second branch point P2 at the end of each intermediate passage 55, and each second branch point P2. A plurality of (two in the example of the figure) branch passages 54b and 54c extend from each of the above. Each intermediate aisle 55 extends in a direction (for example, a left-right direction in the example of the figure) intersecting (for example, orthogonal to) the main aisle 53 in a plan view of the seat pad 302. As in the example of FIG. 2, the plurality of (two in the example of the figure) branch passages 54b and 54c extending from the second branch point P2 are, for example, from the second branch point P2 on the seated side (upper side). A branch passage 54b extending in the substantially thickness direction TD (approximately vertical direction) toward the second opening 52 and reaching the second opening 52 can be included. And / or the plurality of (two in the example of the figure) branch passages 54b and 54c extending from the second branch point P2 are, for example, from the second branch point P2 to the main passage 53 in the plan view of the seat pad 302. After extending in a direction that intersects (for example, orthogonally) with respect to (for example, in the left-right direction in the example of the figure), bends or bends, and then substantially a thickness direction TD (approximately vertical direction) toward the seater side (upper side). A branch passage 54c that extends to the second opening 52 and reaches the second opening 52 can be included.

Further, in the example of the back pad 320 (seat pad 302) shown in FIGS. 4 to 5, the fluid passage 5 has one first opening 51 and a plurality of (specifically six) second openings 52. , And extends inside the seat pad 302 from the first opening 51 to each second opening 52. The first opening 51 opens on the lower surface of the side surface SS of the seat pad 302. Each of the second openings opens on the seater-side surface FS of the main pad portion 321 of the seat pad 302.
In this example, the fluid passage 5 includes a main passage 53 that extends continuously from the first opening 51 toward the second opening 52 side, and one or more branch points P on the main passage 53 (hereinafter, "" It has one or a plurality of branch portions 56 branched from each of the first branch points P1 ”). In the example of the figure, the fluid passage 5 has a first branch point P1 at a plurality of different positions (two in the example of the figure) in the extending direction of the main passage 53, and has a branch portion 56. It has a plurality (two in the example of the figure). In the example of the figure, the passage 53 extends in the substantially extending direction LD.
Each branch 56 has one or more (three in the example of the figure) branch passages 54, respectively. Each branch passage 54 has a second opening 52, respectively. Here, in this example, each branch passage 54 is a terminal passage including the second opening 52 of the branch portion 56, and specifically, for example, another branch passage P1 as a starting point. One or more branch points P that extend to the second opening 52 without passing through the branch point P, or are located on the second opening 52 side of the first branch point P1 in the fluid passage 5 (FIG. In the example of), the branch point P on the side of the second opening 52 is the starting point and extends to the second opening 52. If there is another branch point P (does not exist in the example of the figure) between the first branch point P1 and the branch passage 54, the middle between the first branch point P1 and the other branch point P is intermediate. The passage 55 (which does not exist in the example of the figure) extends.
In the example of FIG. 4, the plurality of (three in the example of the figure) branch passages 54 constituting the branch portion 56 intersect (for example, orthogonal to) the main passage 53 in the plan view of the seat pad 302 (example of the figure). Then, they are arranged along the left-right direction).
In the example of FIG. 4, each of the plurality of branch passages 54 (three in the example of the figure) constituting the branch portion 56 starts from the first branch point P1 and does not go through the other branch points P, but the second opening 52. It has been extended to. Among them, one branch passage 54d extends from the first branch point P1 toward the seater side (front side) in the substantially thickness direction TD and reaches the second opening 52. Further, the remaining (two in the example of the figure) branch passages 54e intersect (for example, orthogonally) the main passage 53 in the plan view of the seat pad 302 from the first branch point P1 (in the example of the figure). After extending in the left-right direction), it bends or curves, and then extends in the substantially thickness direction TD toward the seater side (front side) to reach the second opening 52.

Here, the effect of this embodiment will be described.
First, when the seat pad 302 is manufactured through the above-mentioned conventional step of foaming by a chemical reaction, the inside of the seat pad 302 extends from the first opening 51 that opens on the outer surface of the seat pad 302. It is difficult to form the fluid passage 5 up to the second opening 52 that opens to the outer surface of the seat pad 302. For example, when the seat pad 302 is foam-molded using a mold, the fluid passage 5 needs to be molded by the mold molding surface, but the die-cutting becomes difficult. Further, for example, in the seat pad 302, it is conceivable to separately form a pair of parts on both sides of the fluid passage 5 with respect to the flow path axis (center axis of the flow path), and then attach both of them, but the manufacturing process is Increase. In addition, the feasible configuration of the fluid passage 5 is limited.
On the other hand, according to the present embodiment, since the seat pad 302 (cushion pad 310, back pad 320) is modeled by the 3D printer, the seat pad 302 having the fluid passage 5 can be easily manufactured in one step. can do. Further, as compared with the case where the seat pad 302 is manufactured through the step of foaming by a chemical reaction, the degree of freedom in designing the fluid passage 5 can be greatly expanded, and the fluid passage 5 has any configuration. Also, the seat pad 302 having the fluid passage 5 can be manufactured with high accuracy as expected.
Further, in the present embodiment, since the seat pad 302 (cushion pad 310, back pad 320) has the fluid passage 5, for example, when the fluid passage 5 is connected to the outlet of the air conditioner, the air conditioner (not shown) By flowing the air (warm air, cold air, etc.) through the fluid passage 5, it becomes possible to effectively control the temperature of the seat pad 302 and the seated person. Further, even when the fluid passage 5 is not connected to the outlet of the air conditioner, the air permeability (and thus the ventilation performance) of the seat pad 302 can be improved. Therefore, the air inside the seat pad 302 is evacuated by natural ventilation. It can be effectively replaced with the outside air of. Therefore, for example, the air temperature-controlled by the air conditioner in the vehicle can be easily sent into the seat pad 302, and the temperature of the seat pad 302 and the seated person can be effectively controlled, so that the effectiveness of the air conditioner can be improved. In addition, the moisture inside the seat pad 302 can be effectively discharged.
Further, in the present embodiment, the second opening 52 of the fluid passage 5 is opened to the surface FS on the seater side of the seat pad 302 (cushion pad 310, back pad 320) (FIGS. 2 and 4). As a result, if the first opening 51 is connected to the outlet of the air conditioner, the wind from the air conditioner is discharged toward the seated person from the second opening 52 provided on the surface FS on the seated side. Therefore, the seated person can directly receive the wind from the air conditioner, and thus the temperature of the seated person can be controlled more effectively. Further, even when the fluid passage 5 is not connected to the outlet of the air conditioner, the air in the portion of the seat pad 302 near the surface FS on the seater side, which is closest to the seater, is removed by natural ventilation. Since it can be effectively replaced with the air outside the pad 302, the temperature control and the moisture removal can be effectively performed particularly in the portion where the temperature control and the moisture removal are required.

In each of the examples of FIGS. 2 to 5, as described above, the fluid passage 5 has a plurality of branch passages 54, and each of the plurality of branch passages 54 has a seat pad 302 (cushion pad 310, The back pad 320) has a second opening 52 that opens to the seated surface FS. As a result, if the first opening 51 is connected to the outlet of the air conditioner, the wind from the air conditioner can be discharged from the second openings 52 at a plurality of dispersed positions toward the seated person. As compared with the case where the fluid passage 5 does not have the branch passage 54 (and thus has only one second opening 52), the temperature control of the seated person can be performed more effectively. Further, even when the fluid passage 5 is not connected to the outlet of the air conditioner, the air in the seat pad 302 in the vicinity of the surface FS on the seater side, which requires temperature control and moisture removal, is evacuated by natural ventilation. Since the air outside the seat pad 302 can be effectively replaced at a plurality of dispersed positions, temperature control and moisture removal can be performed more effectively.
In each of the examples of FIGS. 2 to 5, the fluid passage 5 has a plurality of branch passages 54 on the second opening 52 side, but in each of the examples described in the present specification, the fluid passage 5 is , The first opening 51 may have a plurality of branch passages 54, that is, in the fluid passage 5, each of the plurality of branch passages 54 is seated on the seat pad 302 (cushion pad 310, back pad 320). It may have a first opening 51 that opens to a surface other than the surface FS on the person side. Further, in each example described in the present specification, the fluid passage 5 has only one first opening 51 and one second opening 52, and only an intermediate portion between the first opening 51 and the second opening 52. It may have a plurality of branch passages 54 branched at.

In the example of FIGS. 2 to 3, in the seat pad 302 configured as the cushion pad 310, as described above, the second opening 52 of the fluid passage 5 opens to the seater-side surface FS of the lower buttock 311h. There is. As a result, if the first opening 51 is connected to the outlet of the air conditioner, the wind from the air conditioner is blown from the second opening 52 provided on the seating side surface FS of the lower buttock 311h to the buttock portion of the seated person. Since the second opening 52 can be discharged toward, the seating is performed as compared with the case where the second opening 52 is opened to another seating side surface FS (for example, the seating side surface FS of the side pad portion 312). It is possible to control the temperature of the person more effectively. Further, even when the fluid passage 5 is not connected to the outlet of the air conditioner, the lower part of the tail where temperature control and moisture removal are particularly required in the portion near the surface FS on the seater side of the seat pad 302 by natural ventilation. Since the air in the vicinity of the surface FS on the seater side of 311h can be effectively replaced with the air outside the seat pad 302, temperature control and moisture removal can be performed more effectively.
However, in the seat pad 302 configured as the cushion pad 310, the second opening 52 may be opened at an arbitrary position on the seater-side surface FS of the seat pad 302, for example, in addition to the lower buttock 311h /. Instead, even if the lower part of the thigh 311t is opened on the seater-side surface FS, sufficiently effective temperature control and moisture removal are possible. Further, the second opening 52 may be opened to the surface FS on the seater side of the side pad portion 312.

In the example of FIGS. 4 to 5, in the seat pad 302 configured as the back pad 320, as described above, the second opening 52 of the fluid passage 5 opens to the surface FS on the seater side of the main pad portion 321. ing. As a result, if the first opening 51 is connected to the outlet of the air conditioner, the wind from the air conditioner is blown from the second opening 52 provided on the seater-side surface FS of the main pad portion 321 to the seater's back. Since the second opening 52 is opened to the surface FS on the seater side of the side pad portion 322, the temperature of the seated person can be controlled more effectively. it can. Further, even when the fluid passage 5 is not connected to the outlet of the air conditioner, the main pad which requires temperature control and moisture removal in the portion near the surface FS on the seater side of the seat pad 302 by natural ventilation. Since the air in the vicinity of the surface FS on the seater side of the portion 321 can be effectively replaced with the air outside the seat pad 302, temperature control and moisture removal can be performed more effectively.
However, in the seat pad 302 configured as the back pad 320, the second opening 52h may be opened at an arbitrary position on the seater side surface FS of the seat pad 302, and for example, in addition to the main pad portion 321. / Alternatively, even if the side pad portion 322 has an opening on the seating side surface FS, effective temperature control and moisture removal can be performed.

In each of the examples of FIGS. 2 to 5, as described above, the first opening 51 of the fluid passage 5 is the outer surface of the seat pad 302 (cushion pad 310, back pad 320) other than the surface on the seater side. It is open to the surface FS. More specifically, in the example of FIGS. 2 to 3 in which the seat pad 302 is configured as the cushion pad 310, the first opening 51 opens to the front surface of the side surface SS of the seat pad 302. Further, in the example of FIGS. 4 to 5 in which the seat pad 302 is configured as the back pad 320, the first opening 51 is opened on the lower surface of the side surface SS of the seat pad 302. As a result, if the first opening 51 is connected to the outlet of the air conditioner, the outlet of the air conditioner can be prevented from interfering with the seated person. Further, even when the fluid passage 5 is not connected to the outlet of the air conditioner, it is possible to suppress the possibility that natural ventilation becomes difficult because both the first opening 51 and the second opening 52 are blocked by the seated person. ..
When the seat pad 302 is the cushion pad 310, the same effect can be obtained even if the first opening 51 is opened to the side surface SS (left surface, right surface, rear surface) other than the front surface of the seat pad 302 or the back surface BS. can get. Further, when the seat pad 302 is the back pad 320, the same effect can be obtained even if the first opening 51 is opened to the side surface SS (left surface, right surface, upper surface) other than the lower surface of the seat pad 302 or the back surface BS. can get.
However, the first opening 51 may be opened to the surface FS on the seater side of the seat pad 302 (cushion pad 310, back pad 320).

In each of the examples described in the present specification, the fluid passage 5 of the seat pad 302 (cushion pad 310, back pad 320) is inside the seat pad 302 from the first opening 51 that opens to the outer surface of the seat pad 302. Any configuration may be provided as long as it extends to the second opening 52 that extends to the surface FS on the seater side of the seat pad 302.
For example, the fluid passage 5 does not have to extend parallel to the extending direction LD, the thickness direction TD, or the left-right direction inside the seat pad 302, and extends three-dimensionally in any direction. May be present. Further, the fluid passage 5 does not have to extend linearly, and may extend while being curved.
Further, the fluid passage 5 may not have the branch portion 56 (and thus the branch point P), but may have only the main passage 53. In that case, the fluid passage 5 has one first opening 51 and one second opening 52.
Further, when the fluid passage 5 has a branch portion 56 (and by extension, a branch point P), the fluid passage 5 may have any number of branch points P in the branch portion 56 at an arbitrary position.
Further, in each of the examples of FIGS. 2 to 5, the seat pad 302 has only one fluid passage 5, but the seat pad 302 has a plurality of independent fluid passages 5 that are not connected to each other. You may be.

[Porous structure]
Next, the porous structure 1 suitable for forming the seat pad 302 (cushion pad 310, back pad 320) according to the first embodiment described above will be described in detail with reference to FIGS. 6 to 10. .. The porous structure 1 described below can be used for the seat pad 302 of any example described in the present specification.
In addition, in FIGS. 6 to 10, in order to make it easy to understand the orientation of the porous structure 1, the orientation of the XYZ Cartesian coordinate system fixed to the porous structure 1 is displayed. The XYZ Cartesian coordinate system fixed to the porous structure 1 may be oriented in any direction with respect to the seat pad 302.

First, an example of the porous structure 1 will be described with reference to FIGS. 6 to 9.
In FIGS. 6 to 8, a part of the porous structure 1 constituting the seat pad 302 having a substantially rectangular parallelepiped outer shape is viewed from different angles. FIG. 6 is a perspective view showing the portion of the porous structure 1. FIG. 7 is a view on arrow A showing a state in which the portion of the porous structure 1 of FIG. 6 is viewed from the direction of arrow A (direction Y). FIG. 8 is a B arrow view showing a state in which the portion of the porous structure 1 of FIG. 6 is viewed from the direction of the B arrow (−Z direction).

As described above, the porous structure 1 is formed by a 3D printer. The entire porous structure 1 is integrally formed.
The porous structure 1 is made of a flexible resin or rubber. More specifically, the porous structure 1 includes a skeleton portion 2 that forms the skeleton of the porous structure 1. The skeleton portion 2 partitions a large number of cell holes C. The skeleton portion 2 exists almost entirely over the porous structure 1 and is made of a flexible resin or rubber. In this example, the portion of the porous structure 1 other than the skeleton portion 2 is a void, in other words, the porous structure 1 is composed of only the skeleton portion 2.

As shown in FIGS. 6 to 8, the skeleton portion 2 of the porous structure 1 is composed of a plurality of bone portions 2B and a plurality of connecting portions 2J, and the entire skeleton portion 2 is integrally formed. Has been done. In this example, each bone portion 2B is formed in a columnar shape, and in this example, each bone portion 2B extends linearly. Each connecting portion 2J joins these end portions 2B to each other at a position where the extending direction end portions 2Be of a plurality of (for example, four) bone portions 2B extending in different directions are adjacent to each other. are doing.
6 to 8 show the skeleton line O of the skeleton portion 2 by a alternate long and short dash line in a part of the porous structure 1. The skeleton line O of the skeleton portion 2 is composed of the skeleton line O of each bone portion 2B and the skeleton line O of each connecting portion 2J. The skeleton line O of the bone portion 2B is the central axis of the bone portion 2B. The skeleton line O of the connecting portion 2J is an extension line portion formed by smoothly extending the central axis of each bone portion 2B connected to the connecting portion 2J into the connecting portion 2J and connecting them to each other.
The extending direction of the bone portion 2B is the extending direction of the skeleton line O of the bone portion 2B (the portion of the skeleton line O corresponding to the bone portion 2B; the same applies hereinafter).
Since the porous structure 1 includes the skeleton portion 2 almost entirely thereof, it can be compressed / restored and deformed according to the addition / release of an external force while ensuring breathability, so that the cushioning material (and thus the sheet) The characteristics as a pad) are improved. In addition, the structure of the porous structure 1 becomes simple, and it becomes easy to model with a 3D printer.
Of the bone portions 2B constituting the skeleton portion 2, a part or all of the bone portions 2B may extend while being curved. In this case, since part or all of the bone portion 2B is curved, it is possible to prevent a sudden shape change of the bone portion 2B and thus the porous structure 1 at the time of inputting a load, and suppress local buckling. be able to.

In this example, each bone portion 2B constituting the skeleton portion 2 has substantially the same shape and length. However, not limited to this example, the shape and / or length of each bone portion 2B constituting the skeleton portion 2 does not have to be the same, for example, the shape and / or length of a part of the bone portion 2B. May be different from other bones 2B. In this case, by making the shape and / or length of the bone portion 2B of the specific portion of the skeleton portion 2 different from that of the other portions, it is possible to intentionally obtain different mechanical properties.

In this example, the width W0 (FIG. 6) and the cross-sectional area of each bone 2B are constant over the entire length of the bone 2B (that is, uniform along the extending direction of the bone 2B).
Here, the cross-sectional area of the bone portion 2B refers to the cross-sectional area of the cross section perpendicular to the skeleton line O of the bone portion 2B. Further, the width W0 (FIG. 6) of the bone portion 2B refers to the maximum width in the cross section measured along the cross section perpendicular to the skeleton line O of the bone portion 2B.
However, in each example described in the present specification, a part or all of the bone parts 2B constituting the skeleton part 2 have a width W0 and / or a cross-sectional area of the bone part 2B, respectively. It may be non-uniform along the extending direction of the portion 2B. For example, a part or all of the bone parts 2B constituting the skeleton part 2 have a width W0 of the bone part 2B in a portion including both end portions 2Be in the extending direction of the bone part 2B. However, it may gradually increase or decrease toward both ends in the extending direction of the bone portion 2B. Further, a part or all of the bone parts 2B constituting the skeleton part 2 are the cross-sectional areas of the bone parts 2B in the portion including the end portions 2Be on both sides in the extending direction of the bone part 2B, respectively. However, it may gradually increase or decrease toward both ends in the extending direction of the bone portion 2B.

In each of the examples described in the present specification, the width W0 of the bone portion 2B (FIG. 6) is considered from the viewpoint of simplification of the structure of the skeleton portion 2 and the ease of manufacturing the porous structure 1 by the 3D printer. Is more preferably 0.05 mm or more, and more preferably 0.10 mm or more. When the width W0 is 0.05 mm or more, modeling is possible with the resolution of a high-performance 3D printer, and when the width W0 is 0.10 mm or more, modeling is possible not only with the resolution of a high-performance 3D printer but also with the resolution of a general-purpose 3D printer.
On the other hand, from the viewpoint of improving the accuracy of the outer edge (outer contour) shape of the skeleton portion 2, reducing the gap (interval) between the cell holes C, and improving the characteristics as a cushioning material, the bone portion The width W0 of 2B is preferably 2.0 mm or less.
It is preferable that each bone portion 2B constituting the skeleton portion 2 satisfies this configuration, but only a part of the bone portions 2B constituting the skeleton portion 2 satisfies this configuration. In that case, the same effect can be obtained, although the degree may vary.

In this example, each bone portion 2B constituting the skeleton portion 2 is columnar and has a circular (perfect circular) cross-sectional shape.
This simplifies the structure of the skeleton portion 2 and facilitates modeling with a 3D printer. In addition, it is easy to reproduce the mechanical properties of a general polyurethane foam produced through a process of foaming by a chemical reaction. Therefore, the characteristics of the porous structure 1 as a cushioning material can be improved. Further, by forming the bone portion 2B in a columnar shape in this way, the durability of the skeleton portion 2 can be improved as compared with the case where the bone portion 2B is replaced with a thin film-like portion.
The cross-sectional shape of each bone portion 2B is a shape in a cross section perpendicular to the central axis (skeleton line O) of the bone portion 2B.
Not limited to this example, only a part of the bones 2B constituting the skeleton 2 may satisfy this configuration, and even in that case, the degree may vary. A similar effect can be obtained.
For example, in each example described in the present specification, all or part of the bone portions 2B constituting the skeleton portion 2 have a polygonal cross-sectional shape (other than an equilateral triangle and an equilateral triangle). It may be a triangle, a quadrangle, etc.), or a circle other than a perfect circle (oval, etc.), and even in that case, the same effect as in this example can be obtained. Further, each bone portion 2B may have a uniform cross-sectional shape along the extending direction thereof, or may be non-uniform along the extending direction thereof. Further, the cross-sectional shapes of the bone portions 2B may be different from each other.

In each example described in the present specification, the ratio of the volume VB occupied by the skeleton portion 2 (VB × 100 / VS [%]) to the apparent volume VS of the skeleton portion 2 is 3 to 10%. Suitable. With this configuration, the reaction force generated in the skeleton portion 2 when an external force is applied to the skeleton portion 2, and by extension, the hardness of the skeleton portion 2 (and thus the hardness of the porous structure 1) can be used as a seat pad, particularly. It can be a good seat pad for a vehicle.
Here, the "apparent volume VS of the skeleton portion 2" is the entire internal space surrounded by the outer edge (outer contour) of the skeleton portion 2 (the volume occupied by the skeleton portion 2 and the membrane 3 described later (FIG. 10)). When is provided, it refers to the volume of the volume occupied by the film 3 and the volume occupied by the voids).
When the materials constituting the skeleton portion 2 are considered to be the same, the higher the ratio of the volume VB occupied by the skeleton portion 2 to the apparent volume VS of the skeleton portion 2, the more the skeleton portion 2 (and thus the porous structure 1) becomes. It becomes hard. Further, the lower the ratio VB of the volume occupied by the skeleton portion 2 to the apparent volume VS of the skeleton portion 2, the softer the skeleton portion 2 (and thus the porous structure 1).
The reaction force generated in the skeleton portion 2 when an external force is applied to the skeleton portion 2, and the hardness of the skeleton portion 2 (and thus the porous structure 1) are used as a seat pad, particularly as a seat pad for a vehicle. From the viewpoint of making it good, it is more preferable that the ratio of the volume VB occupied by the skeleton portion 2 to the apparent volume VS of the skeleton portion 2 is 4 to 8%.
Any method may be used as a method for adjusting the ratio of the volume VB occupied by the skeleton portion 2 to the apparent volume VS of the skeleton portion 2, but for example, a part or all of the skeleton portion 2 is formed. A method of adjusting the thickness (cross-sectional area) of the bone portion 2B and / or the size (cross-sectional area) of a part or all of the connecting portions J constituting the skeleton portion 2 can be mentioned.

In each of the examples described herein, the 25% hardness of the porous structure 1 is preferably 60 to 500 N, more preferably 100 to 450 N. Here, the 25% hardness (N) of the porous structure 1 is such that the porous structure can be compressed by 25% in an environment of 23 ° C. and a relative humidity of 50% using an Instron type compression tester. It is assumed that the measured value is obtained by measuring the required load (N). As a result, the hardness of the seat pad 302 made of the porous structure 1 can be made good.

As shown in FIGS. 6 to 8, in this example, the skeleton portion 2 has a plurality of cell partition portions 21 (as many as the number of cell holes C) that internally partition the cell holes C.
FIG. 9 shows one cell compartment 21 alone. The skeleton portion 2 of this example has a structure in which a large number of cell compartments 21 are connected in each of the X, Y, and Z directions.
As shown in FIGS. 6 to 9, each cell partition 21 has a plurality of (14 in this example) annular portions 211, respectively. Each of the annular portions 211 is formed in an annular shape, and the flat virtual surface V1 is partitioned by the inner peripheral side edge portions 2111 of the respective annular portions. The plurality of annular portions 211 constituting the cell partition portion 21 are connected to each other so that the virtual surfaces V1 partitioned by the inner peripheral side edge portions 2111 do not intersect with each other.
The cell hole C is partitioned by a plurality of annular portions 211 constituting the cell partition portion 21, and a plurality of virtual surfaces V1 in which the plurality of annular portions 211 are partitioned. Roughly speaking, the annular portion 211 is a portion that partitions the side of the three-dimensional shape formed by the cell hole C, and the virtual surface V1 is a portion that partitions the constituent surface of the three-dimensional shape formed by the cell hole C.
Each annular portion 211 is composed of a plurality of bone portions 2B and a plurality of connecting portions 2J for connecting the end portions 2Be of the plurality of bone portions 2B.
The connecting portion between the pair of annular portions 211 connected to each other is composed of one bone portion 2B shared by the pair of annular portions 211 and a pair of connecting portions 2J on both sides thereof. That is, each bone portion 2B and each connecting portion 2J are shared by a plurality of annular portions 211 adjacent to each other.
Each virtual surface V1 has a part of one cell hole C partitioned by one surface of the virtual surface V1 (the surface of the virtual surface V1), and the other surface of the virtual surface V1. A part of another cell hole C is partitioned by (the back surface of the virtual surface V1). In other words, each virtual surface V1 divides a part of separate cell holes C by the surfaces on both the front and back sides thereof. In other words, each virtual surface V1 is shared by a pair of cell holes C adjacent to the virtual surface V1 (that is, a pair of cell holes C sandwiching the virtual surface V1).
Further, each annular portion 211 is shared by a pair of cell compartments 21 adjacent to the annular portion 211 (that is, a pair of cell compartments 21 sandwiching the annular portion 211 in between). In other words, each annular portion 211 constitutes each part of a pair of cell compartments 211 adjacent to each other.
In this example, each virtual surface V1 is not covered by the film 3 (FIG. 10) described later and is open, that is, constitutes an opening. Therefore, the cell holes C are communicated with each other through the virtual surface V1, and ventilation between the cell holes C is possible. As a result, the air permeability of the skeleton portion 2 can be improved, and the skeleton portion 2 can be easily compressed / restored and deformed in response to the addition / release of an external force.

As shown in FIG. 9, in this example, the skeleton line O of each cell compartment 21 has a polyhedral shape, so that each cell hole C has a substantially polyhedral shape. More specifically, in the examples of FIGS. 6 to 9, the skeleton line O of each cell compartment 21 has the shape of a Kelvin tetradecahedron (truncated octahedron), whereby each cell hole C is formed. It has the shape of a Kelvin tetradecahedron (truncated octahedron). The Kelvin tetradecahedron (truncated octahedron) is a polyhedron composed of six regular quadrilateral constituent faces and eight regular hexagonal constituent faces. Roughly speaking, the cell holes C constituting the skeleton portion 2 fill the internal space surrounded by the outer edge (outer contour) of the skeleton portion 2 (that is, each cell hole C has no unnecessary gaps). They are arranged in a regular manner so that they can be spread out, in other words, to reduce the gap (interval) between the cell holes C).
As in this example, the shape of the skeleton line O of the cell compartment 21 of a part or all of the skeleton part 2 (all in this example) (and by extension, a part or all of the skeleton part 2 (all in this example)). By making the cell hole C (shape) of the cell hole C a polyhedron, it is possible to make the gap (interval) between the cell holes C constituting the skeleton portion 2 smaller, and to make more cell holes C of the skeleton portion 2 Can be formed inside. Further, as a result, the behavior of compression / restoration deformation of the skeleton portion 2 (and by extension, the porous structure 1) in response to the addition / release of the external force becomes better as a seat pad, particularly as a seat pad for a vehicle. Become.
The polyhedral shape formed by the skeleton line O of the cell compartment 21 (and thus the polyhedral shape formed by the cell hole C) is not limited to this example, and any shape can be used. For example, even when the shape of the skeleton line O of the cell compartment 21 (and thus the shape formed by the cell hole C) is a substantially tetrahedron, a substantially octahedron, or a substantially dodecahedron, the gap (interval) between the cell holes C is reduced. It is suitable from the viewpoint of Further, the shape of the skeleton line O of a part or all of the cell compartments 21 of the skeleton part 2 (and thus the shape formed by the cell holes C of a part or all of the skeleton part 2) is a three-dimensional shape other than a substantially polyhedron (for example). , Sphere, ellipsoid, cylinder, etc.). Further, the skeleton portion 2 may have only one type of cell partition portion 21 having the same shape of the skeleton line O as the cell partition portion 21, or a plurality of types having different shapes of the skeleton line O. May have a cell compartment 21 of. Similarly, the skeleton portion 2 may have only one type of cell hole C having the same shape as the cell hole C, or may have a plurality of types of cell holes C having different shapes. Good. When the shape of the skeleton line O of the cell compartment 21 (and by extension, the shape of the cell hole C) is substantially Kelvin tetradecahedron (truncated octahedron) as in this example, it is compared with other shapes. It is easiest to reproduce the characteristics of a cushioning material equivalent to general polyurethane foam manufactured through a process of foaming by a chemical reaction.

As shown in FIGS. 6 to 9, in this example, the plurality of (14 in this example) annular portions 211 constituting the cell compartment 21 are one or a plurality (six in this example), respectively. The small annular portion 211S of the above and one or more (eight in this example) large annular portion 211L are included. Each of the small annular portions 211S divides the small virtual surface V1S by the inner peripheral side edge portion 2111 of the annular portion. Each macrocyclic portion 211L divides a large virtual surface V1L having a larger area than the small virtual surface V1S by the inner peripheral side edge portion 2111 of the annular portion.
As can be seen from FIG. 9, in this example, the skeleton line O of the macrocyclic portion 211L has a regular hexagonal shape, and the large virtual surface V1L also has a substantially regular hexagonal shape. Further, in this example, the skeleton line O of the small annular portion 211S has a regular quadrangle, and accordingly, the small virtual surface V1S also has a substantially regular quadrangle. As described above, in this example, the small virtual surface V1S and the large virtual surface V1L differ not only in area but also in shape.
Each macrocyclic portion 211L is a combination of a plurality of (six in this example) bone portions 2B and a plurality of (six in this example) bone portions 2Be for connecting the plurality of bone portions 2B. It is composed of a part 2J. Each of the small annular portions 211S is a combination of a plurality of (four in this example) bone portions 2B and a plurality of (four in this example) connecting the end portions 2Be of these plurality of bone portions 2B. It is composed of a part 2J.
By including the small annular portion 211S and the large annular portion 211L having different sizes, the plurality of annular portions 211 constituting the cell partition portion 21 increase the gap (interval) between the cell holes C constituting the skeleton portion 2. It becomes possible to make it smaller. Further, when the shapes of the small annular portion 211S and the large annular portion 211L are different as in this example, the gap (interval) between the cell holes C constituting the skeleton portion 2 can be further reduced.
However, the plurality of annular portions 211 constituting the cell partition portion 21 may have the same size and / or shape, respectively. When the size and shape of each annular portion 211 constituting the cell partition portion 21 are the same, mechanical characteristics equal to each of the directions of X, Y, and Z can be obtained.

As in this example, of each annular portion 211 constituting the cell partition portion 21, the skeleton line O of a part or all (all in this example) of the annular portion 211 (by extension, each virtual portion constituting the cell partition portion 21). The virtual surface V1) of a part or all (all in this example) of the surface V1 has a substantially polygonal shape, so that the distance between the cell holes C constituting the skeleton portion 2 can be made smaller. Become. Further, the behavior of compression / restoration deformation of the skeleton portion 2 in response to the addition / release of an external force becomes better as a seat pad, particularly as a seat pad for a vehicle. Further, since the shape of the annular portion 211 (and thus the shape of the virtual surface V1) is simplified, the manufacturability and the ease of adjusting the characteristics can be improved. It should be noted that at least one annular portion 211 (by extension, at least one virtual surface V1 among each virtual surface V1 constituting the skeleton portion 2) of each annular portion 211 constituting the skeleton portion 2 satisfies this configuration. If so, the same effect can be obtained, although the degree may vary.
The skeleton line O of at least one annular portion 211 among the annular portions 211 constituting the skeleton portion 2 (and by extension, at least one virtual plane V1 among the virtual planes V1 constituting the skeleton portion 2) is Any substantially polygonal shape other than the substantially regular hexagon and the substantially regular quadrangle as in this example, or a plane shape other than the substantially regular polygon shape (for example, a circle (perfect circle, ellipse, etc.)) may be formed. When the shape of the skeleton line O of the annular portion 211 (and thus the shape of the virtual surface V1) is a circle (a perfect circle, an ellipse, etc.), the shape of the annular portion 211 (and thus the shape of the virtual surface V1) becomes simple. Manufacturability and ease of adjusting characteristics can be improved, and more uniform mechanical characteristics can be obtained. For example, when the shape of the skeleton line O of the annular portion 211 (and thus the shape of the virtual surface V1) is a long ellipse (horizontally long ellipse) substantially perpendicular to the direction in which the load is applied, the direction in which the load is applied Compared to the case where the ellipse is long in a substantially parallel direction (longitudinal ellipse), the annular portion 211 and, by extension, the skeleton portion 2 (and thus the porous structure 1) are more likely to be deformed with respect to the input of a load ( It becomes soft).

In this example, it is preferable that the skeleton portion 2 has at least one cell hole C having a diameter of 5 mm or more. This facilitates the production of the porous structure 1 using a 3D printer. If the diameter of each cell hole C of the skeleton portion 2 is less than 5 mm, the structure of the skeleton portion 2 becomes too complicated, and as a result, three-dimensional shape data (CAD data, etc.) representing the three-dimensional shape of the porous structure 1 Alternatively, it may be difficult to generate 3D modeling data generated based on the three-dimensional shape data on a computer.
Since the porous structure constituting the conventional seat pad was manufactured through a step of foaming by a chemical reaction, it was not possible to form a cell hole C having a diameter of 5 mm or more.
Further, since the skeleton portion 2 has the cell hole C having a diameter of 5 mm or more, it becomes easy to improve the air permeability and the easiness of deformation of the skeleton portion 2.
From this point of view, it is preferable that the diameters of all the cell holes C constituting the skeleton portion 2 are 5 mm or more, respectively.
The larger the diameter of the cell hole C, the easier it is to manufacture the porous structure 1 (and thus the seat pad 302) using a 3D printer, and it becomes easier to improve the air permeability and the easiness of deformation. From such a viewpoint, the diameter of at least one (preferably all) cell holes C in the skeleton portion 2 is more preferably 8 mm or more, still more preferably 10 mm or more.
On the other hand, if the cell hole C of the skeleton portion 2 is too large, it becomes difficult to form the outer edge (outer contour) shape of the skeleton portion 2 (and by extension, the porous structure 1) neatly (smoothly), and the shape of the seat pad 302. The accuracy may decrease and the appearance may deteriorate. In addition, the characteristics of the seat pad may not be sufficiently good. Therefore, from the viewpoint of improving the appearance and the characteristics as a seat pad, the diameter of each cell hole C of the skeleton portion 2 is preferably less than 30 mm, more preferably 25 mm or less, and further preferably 20 mm or less. ..
The diameter of the cell hole C refers to the diameter of the circumscribed sphere of the cell hole C when the cell hole C has a shape different from the exact spherical shape as in this example.

If the cell hole C of the skeleton portion 2 is too small, the structure of the skeleton portion 2 becomes too complicated, and as a result, three-dimensional shape data (CAD data or the like) representing the three-dimensional shape of the porous structure 1 or its three-dimensional shape. There is a risk that it will be difficult to generate 3D modeling data generated based on the shape data on a computer, and even if they can be generated, it may be difficult for a 3D printer to model according to the 3D modeling data. Therefore, it becomes difficult to manufacture the porous structure 1 using a 3D printer. From the viewpoint of facilitating the production of the porous structure 1 (and thus the seat pad 302) using a 3D printer, the diameter of the cell hole C having the smallest diameter among the cell holes C constituting the skeleton portion 2 is set. It is preferably 0.05 mm or more, and more preferably 0.10 mm or more. When the diameter of the cell hole C having the minimum diameter is 0.05 mm or more, it is possible to model with the resolution of a high-performance 3D printer, and when it is 0.10 mm or more, not only a high-performance 3D printer but also a general-purpose 3D It can also be modeled at the resolution of the printer.

FIG. 10 is a drawing for explaining a modification of the cell compartment 21 of the porous structure 1, and is a drawing corresponding to FIG. 9. In each of the examples described herein, the porous structure 1 may include one or more membranes 3 in addition to the skeleton portion 2, as in the modified example shown in FIG.
The film 3 extends over the virtual surface V1 partitioned by the annular inner peripheral edge 2111 of the annular portion 211, thereby covering the virtual surface V1 partitioned by the annular portion 211. In the porous structure 1 of the example of FIG. 10, at least one of the virtual surfaces V1 constituting the skeleton portion 2 is covered with the film 3. The film 3 is made of the same material as the skeleton portion 2 and is integrally formed with the skeleton portion 2. In the example of FIG. 10, the film 3 is formed flat. However, the film 3 may be configured to be non-flat (for example, curved (curved)).
It is preferable that the membrane 3 has a thickness smaller than the width W0 (FIG. 6) of the bone portion 2B.
Due to the membrane 3, the two cell holes C sandwiching the virtual surface V1 are not communicated with each other through the virtual surface V1 and cannot be ventilated through the virtual surface V1. Therefore, the entire porous structure 1 is formed. As the air permeability is reduced. By adjusting the number of virtual surfaces V1 constituting the porous structure 1 that are covered with the membrane 3, the overall air permeability of the porous structure 1 can be adjusted, and various types can be obtained as required. Breathability levels can be achieved. For example, when the porous structure 1 is used for a vehicle seat pad, the effectiveness of the air conditioner in the vehicle can be enhanced, the stuffiness resistance can be enhanced, and the riding comfort can be improved by adjusting the air permeability of the porous structure 1. Can be enhanced. When the porous structure 1 is used for a vehicle seat pad, from the viewpoint of enhancing the effectiveness and stuffiness resistance of the air conditioner in the vehicle and improving the riding comfort, each virtual surface V1 constituting the porous structure 1 It is not preferable that all of them are covered with the membrane 3, in other words, it is preferable that at least one of the virtual surfaces V1 constituting the porous structure 1 is not covered with the membrane 3 and is open.
Since the porous structure constituting the conventional seat pad was manufactured through the step of foaming by a chemical reaction as described above, the position of the membrane in the communication hole communicating the cells with each other is as expected. And it was difficult to form by number. When the porous structure 1 (and thus the seat pad 302) is manufactured by a 3D printer as in this example, the information of the film 3 is surely included in the 3D modeling data read by the 3D printer in advance. It is possible to form the film 3 at the desired position and number.
From the same viewpoint, at least one of the small virtual surfaces V1S constituting the skeleton portion 2 may be covered with the film 3. And / or at least one of the large virtual surfaces V1L constituting the skeleton portion 2 may be covered with the film 3.

In each example described in the present specification, when the porous structure 1 is used for a vehicle seat pad, the porous structure is improved from the viewpoint of enhancing the effectiveness and stuffiness resistance of the air conditioner in the vehicle and enhancing the riding comfort. breathable body 1 is suitably ^{100~700cc / cm 2 / sec, 150~650cc} / cm 2 / sec is more preferred, it is further preferable that 200~600cc / cm ² / sec. Here, the air permeability (cc / cm ² / sec) of the porous structure 1 shall be measured in accordance with JIS K 6400-7. When the porous structure 1 is used for a vehicle seat pad, the resonance magnification of the porous structure 1 is preferably 3 times or more and less than 8 times, and more preferably 3 times or more and 5 times or less. ..

[Seat pad manufacturing method, 3D modeling data]
Next, the method for manufacturing the seat pad of the present invention will be illustrated with reference to FIG. The methods described below can be suitably used for producing the seat pads of any of the examples described herein.
First, in advance, a computer is used to create three-dimensional shape data (for example, three-dimensional CAD data) representing the three-dimensional shape of the seat pad 302 composed of the porous structure 1.
Next, the above three-dimensional shape data is converted into 3D modeling data 500 using a computer. The 3D modeling data 500 is read by the control unit 410 of the 3D printer 400 when the modeling unit 420 of the 3D printer 400 performs modeling, and the control unit 410 models the seat pad 302 on the modeling unit 420. It is configured to let you. The 3D modeling data 500 includes, for example, slice data representing the two-dimensional shape of each layer of the seat pad 302.
Next, the seat pad 302 is modeled by the 3D printer 400. The 3D printer 400 may perform modeling using any modeling method such as a stereolithography method, a powder sintering lamination method, a hot melt lamination method (FDM method), or an inkjet method. From the viewpoint of productivity, the stereolithography method is preferable. FIG. 11 shows a state in which modeling is performed by a stereolithography method.
The 3D printer 400 is, for example, a support base for mounting a control unit 410 configured by a CPU or the like, a modeling unit 420 that performs modeling according to control by the control unit 410, and a modeled object (that is, a seat pad 302) to be modeled. It includes a 430, a liquid resin LR, a support 430, and an accommodating body 440 in which a modeled object is housed. The modeling unit 420 has a laser irradiator 421 configured to irradiate an ultraviolet laser beam LL when a stereolithography method is used as in this example. The housing 440 is filled with a liquid resin LR. When the liquid resin LR is exposed to the ultraviolet laser light LL emitted from the laser irradiator 421, the liquid resin LR is cured and becomes a flexible resin.
In the 3D printer 400 configured in this way, first, the control unit 410 reads the 3D modeling data 500, and based on the three-dimensional shape included in the read 3D modeling data 500, the modeling unit 420 receives an ultraviolet laser beam. While controlling to irradiate LL, each layer is sequentially modeled (modeling step).
After the modeling by the 3D printer 400 is completed, the modeled object is taken out from the housing 440. As a result, the seat pad 302 made of the porous structure 1 is finally obtained as a modeled object.
By manufacturing the seat pad 302 using a 3D printer, the seat pad 302 having the fluid passage 5 can be realized easily, accurately, and as expected in one step.
When the seat pad 302 is made of resin, the seat pad 302 as a modeled object may be heated in an oven after the modeling by the 3D printer 400 is completed. In that case, the coupling between the layers constituting the seat pad 302 is strengthened, whereby the anisotropy of the seat pad 302 can be reduced, so that the cushioning property of the seat pad 302 can be further improved.
Further, when the seat pad 302 is made of rubber, the seat pad 302 as a modeled object may be vulcanized after the modeling by the 3D printer 400 is completed.

[Seat pad according to the second embodiment]
Next, with reference to FIGS. 12 and 13, the seat pad 302 according to the second embodiment of the present invention will be described focusing on the points different from those of the first embodiment.
FIG. 12 is a cross-sectional view in the front-rear direction (extending direction) showing a cushion pad 310 composed of an example of the seat pad 302 according to the second embodiment of the present invention by a cross section along the line I-I of FIG. Yes, it is a drawing corresponding to FIG. FIG. 13 is a cross-sectional view in the extending direction showing a back pad 320 composed of an example of the seat pad 302 according to the second embodiment of the present invention with a cross section taken along the line KK of FIG. It is a drawing corresponding to.
Hereinafter, for convenience of explanation, the cushion pad 310 and the back pad 320 including the seat pad 302 according to the second embodiment will be described together.
In the second embodiment, the structure of the porous structure 1 constituting the fluid passage vicinity portion 7A of the seat pad 302 constitutes the porous structure 1 of the seat pad 302 other than the fluid passage vicinity portion 7B. It is different from the configuration of. The fluid passage vicinity portion 7A is a portion of the seat pad 302 including a portion that partitions the entire fluid passage 5.
In the second embodiment, the configuration of the fluid passage 5 itself may be as described in the first embodiment.

For example, in the first example of the seat pad 302 according to the second embodiment, the average value of the densities of the porous structures 1 constituting the fluid passage vicinity portion 7A of the seat pad 302 is the fluid passage of the seat pad 302. It is preferable that the density is higher than the average value of the density of the porous structure 1 constituting the portion 7B other than the neighboring portion. Further, in the first example of the seat pad 302 according to the second embodiment, the minimum value of the density of the porous structure 1 constituting the fluid passage vicinity portion 7A of the seat pad 302 is the fluid passage of the seat pad 302. It is preferable that the density is higher than the maximum value of the density of the porous structure 1 constituting the portion 7B other than the neighboring portion.
With such a configuration, it is possible to prevent the fluid (for example, air) flowing in the fluid passage 5 from leaking to the outside of the fluid passage 5 inside the seat pad 302, and by extension, the temperature control described above in the first embodiment. The effect of removing moisture can be further improved.
In the present specification, the "density (kg / m ³ )" of the porous structure 1 refers to the density (apparent density) measured in accordance with JIS K 6400-1: 2004.
The density of the porous structure 1 constituting the fluid passage vicinity portion 7A of the seat pad 302 and the porous structure 1 constituting the portion 7B of the seat pad 302 other than the fluid passage vicinity portion 7A are uniform. It may be non-uniform or non-uniform. However, in the first example of the seat pad 302 according to the second embodiment, the density of the porous structure 1 constituting the fluid passage vicinity portion 7A is uniform, or the density gradually increases toward the fluid passage 5. It is preferable that the number is increased to.
As used herein, the term "gradual increase" includes not only a case where the amount is continuously increased without being constant, but also a case where the amount is gradually increased so as to be partially constant.
As a method for adjusting the density of the porous structure 1, for example, a method of increasing / decreasing the density by increasing / decreasing the ratio of the volume occupied by the skeleton portion 2 and / or the membrane 3 per unit volume is preferable. Any method may be used as a method for increasing / decreasing the density by increasing / decreasing the ratio of the volume occupied by the skeleton portion 2 per unit volume, and for example, the bone portion 2B and / or the connecting portion 2J. It is advisable to use a method of increasing / decreasing the density by increasing / decreasing the cross-sectional area.

Alternatively, in the second example of the seat pad 302 according to the second embodiment, the number of films 3 per cell hole C in the porous structure 1 constituting the fluid passage vicinity portion 7A of the seat pad 302 It is preferable that the average value is higher than the average value of the number of films 3 per cell hole C of the porous structure 1 constituting the portion 7B of the seat pad 302 other than the portion near the fluid passage. .. Further, in the second example of the seat pad 302 according to the second embodiment, the number of films 3 per cell hole C in the porous structure 1 constituting the fluid passage vicinity portion 7A of the seat pad 302 It is preferable that the minimum value is higher than the maximum value of the number of films 3 per cell hole C in the porous structure 1 constituting the portion 7B of the seat pad 302 other than the portion near the fluid passage. .. For example, in the porous structure 1 constituting the fluid passage vicinity portion 7A of the seat pad 302, the cell partition portion 21 for partitioning each cell hole C has one or more films 3, whereas the seat pad It is preferable that the porous structure 1 constituting the portion 7B of the 302 other than the portion near the fluid passage does not have the film 3 in the cell partition portion 21 that partitions each cell hole C.
With such a configuration, as in the first example, it is possible to prevent the fluid (for example, air) flowing in the fluid passage 5 from leaking to the outside of the fluid passage 5 inside the seat pad 302, and by extension, the first. In the embodiment, the effects of temperature control and moisture removal described above can be further improved.
In the present specification, the "average value of the number of membranes 3 per cell hole C" in the porous structure 1 constituting a certain portion is the cell partition portion for partitioning each cell hole C constituting the portion. It refers to a value obtained by dividing the total number of membranes 3 (FIG. 10) provided on 21 by the total number of cell holes C (and thus the cell compartment 21) constituting the portion.
The porous structure 1 constituting the fluid passage vicinity portion 7A of the seat pad 302 and the porous structure 1 constituting the portion 7B of the seat pad 302 other than the fluid passage vicinity portion 7A are each one. The number of films 3 per cell hole C may be uniform or non-uniform. However, in the second example of the seat pad 302 according to the second embodiment, whether the number of membranes 3 per cell hole C is uniform in the porous structure 1 constituting the fluid passage vicinity portion 7A. Alternatively, it is preferable that the number of membranes 3 per cell hole C gradually increases toward the fluid passage 5.

The configurations of the first example and the second example of the seat pad 302 according to the second embodiment described above may be combined.

The thickness of the portion 7A in the vicinity of the fluid passage may be uniform or non-uniform along the fluid passage 5.
The maximum value of the thickness of the portion 7A near the fluid passage (the thickness at the position where the thickness of the portion 7A near the fluid passage is maximum) is, for example, preferably 30 mm or less, and more preferably 15 mm or less. Further, the minimum value of the thickness of the portion 7A near the fluid passage (the thickness at the position where the thickness of the portion 7A near the fluid passage is minimized) is preferably 1 mm or more, and more preferably 3 mm or less. .. The thickness of the portion 7A near the fluid passage shall be measured perpendicular to the inner wall surface of the fluid passage 5.

[Seat pad according to the third embodiment]
Next, the seat pad 302 according to the third embodiment of the present invention will be described with reference to FIGS. 14 to 18, focusing on the points different from those of the first embodiment.
FIG. 14 is a cross-sectional view in the front-rear direction (extending direction) showing a cushion pad 310 composed of an example of the seat pad 302 according to the third embodiment of the present invention by a cross section along the line I-I of FIG. Yes, it is a drawing corresponding to FIG. FIG. 15 is a cross-sectional view in the extending direction showing the back pad 320 composed of an example of the seat pad 302 according to the third embodiment of the present invention by a cross section taken along the line KK of FIG. It is a drawing corresponding to.
Hereinafter, for convenience of explanation, the cushion pad 310 and the back pad 320 including the seat pad 302 according to the third embodiment will be described together.
In the third embodiment, the porous structure 1 constituting the seat pad 302 constitutes a part or all of the outer surface of the seat pad 302 (in each of the examples of FIGS. 14 and 15, the entire skin portion 6). have. The portion of the seat pad 302 other than the epidermis portion 6 is composed of the skeleton portion 2 (in some cases, further the membrane 3) of the porous structure 1.
In the third embodiment, the configuration of the fluid passage 5 itself may be as described in the first embodiment.

16 to 18 are drawings for explaining a porous structure 1 suitable for forming the seat pad 302 according to the third embodiment. FIG. 16 is a perspective view showing a part of the porous structure 1, and is a drawing corresponding to FIG. FIG. 17 is a D arrow view showing a state in which the C portion surrounded by the broken line in the porous structure 1 of FIG. 16 is viewed from the direction of the D arrow (Y direction) of FIG. FIG. 18 is an E arrow view showing a state in which the C portion of the porous structure 1 of FIG. 16 is viewed from the direction of the E arrow (−Z direction).
In the present embodiment, the porous structure 1 includes an epidermis portion 6 in addition to the skeleton portion 2. At this time, the porous structure 1 may or may not include the above-mentioned film 3 (FIG. 10). The configurations of the skeleton portion 2 and the membrane 3 are as described above.
The epidermis portion 6 is integrally formed with the skeleton portion 2 so as to cover a part or all of the outer surface of the skeleton portion 2 (the virtual surface forming the outer edge (outer contour) of the skeleton portion 2). It is composed of the same material as. The skin portion 6 constitutes a part or all of the outer surface of the seat pad 302 composed of the porous structure 1. In the portion of the porous structure 1 shown in FIG. 16, the skin portion 6 is formed in a flat shape, but the skin portion 6 may be formed in an arbitrary shape along the outer surface of the skeleton portion 2, for example. It may be configured in a curved shape (curved surface shape).
As shown in FIG. 18, in this example, the skin portion 6 has a plurality of through holes 6B penetrating the skin portion 6 in the thickness direction of the skin portion 6. The plurality of through holes 6B are provided so as to be dispersed over the entire skin portion 6, whereby the skin portion 6 is formed in a mesh shape. A part or all (preferably all) of each through hole 6B of the epidermis portion 6 is completely closed by the bone portion 2B and the joint portion 2J of the skeleton portion 2 connected to the epidermis portion 6. However, ventilation is possible through the through hole 6B.
In this example, each of the epidermis portions 6 has a plurality of pillar portions 6C extending in columns along the outer surface of the skeleton portion 2 (more specifically, in this example, the epidermis portion 6 has these. It is composed of a pillar portion 6C). The end portions 6Ce of the plurality of pillar portions 6C are connected to each other at a position where the end portions 6Ce in the extending direction are adjacent to each other. Each through hole 6B is partitioned between a plurality of pillar portions 6C. Each pillar portion 6C constituting the epidermis portion 6 is not located inside the skeleton portion 2.
Since the porous structure 1 includes the skin portion 6, it is possible to prevent the skeleton portion 2 from being exposed to the outside of the porous structure 1 (and thus to the outside of the seat pad 302). When a load is applied from the above, the skeleton portion 2 does not receive the load directly, but receives the load via the skin portion 6, so that the skeleton portion 2 is less likely to be damaged. Therefore, the durability of the porous structure 1 (and thus the seat pad 302) can be improved.
Further, since the outer surface of the skin portion 6 has far less unevenness than the outer surface of the skeleton portion 2, the user applies a load to the seat pad 302 by providing the skin portion 6 in the porous structure 1. It is possible to reduce the discomfort that the user sometimes feels. Therefore, the sitting comfort of the seat pad 302 can be improved.
Further, since the epidermis portion 6 has a plurality of through holes 6B, ventilation to the inside and outside of the skeleton portion 2 via the epidermis portion 6 can be ensured.
However, when the skin portion 6 is provided only on a part of the outer surface of the skeleton portion 2 (and thus, when only a part of the outer surface of the seat pad 302 is formed), the inside and outside of the skeleton portion 2 Ventilation can be ensured through a portion of the outer surface of the skeleton portion 2 where the skin portion 6 is not provided (and by extension, a portion of the outer surface of the seat pad 302 where the skin portion 6 is not provided). Therefore, the skin portion 6 does not have to have the through hole 6B, that is, it may be configured in a continuous sheet shape over the entire skin portion 6.

In the examples of FIGS. 16 to 18, in the plan view of the skin portion 6, a plurality of through holes 6B are arranged with a regular arrangement pattern, but the arrangement of the plurality of through holes 6B is random without regularity. Arrangement may be used.
In the examples of FIGS. 16 to 18, in the plan view of the skin portion 6 (as shown in FIG. 18, the surface view viewed from the direction perpendicular to the outer surface of the skin portion 6), each pillar portion 6C is a straight line. Each through hole 6B has a triangular shape and is partitioned between three pillar portions 6C extending in different directions. However, a part or all of each pillar portion 6C may extend in a curved shape (along the curved shape). Further, each through hole 6B has an arbitrary polygonal shape other than a triangle (quadrangle, etc.) or an arbitrary shape other than the polygonal shape (for example, a circle (perfect circle, ellipse, etc.)) in the plan view of the skin portion 6. )) May be done. Further, in the examples of FIGS. 16 to 18, the shapes and dimensions of the through holes 6B in the plan view of the skin portion 6 are uniform (same as each other), but the shapes and / or dimensions of the through holes 6B are not. It may be uniform.
In the examples of FIGS. 16 to 18, each pillar portion 6C constituting the skin portion 6 has a circular (perfect circular shape) in cross-sectional shape. This simplifies the structure of the skin portion 6, facilitates modeling of the porous structure 1 (and thus the seat pad 302) by a 3D printer, and eliminates the outwardly pointed portion of the porous structure 1. Therefore, the feel and sitting comfort of the seat pad 302 can be improved. The cross-sectional shape of each pillar portion 6C is a cross-sectional shape perpendicular to each extending direction. However, all or part of the pillar portions 6C constituting the skin portion 6 may have a polygonal cross-sectional shape (equilateral triangle, a triangle other than an equilateral triangle, a quadrangle, etc.), or , A circle other than an equilateral circle (oval, etc.) may be used. Further, each bone portion 2B may have a uniform cross-sectional shape along the extending direction thereof, or may be non-uniform along the extending direction thereof. Further, the cross-sectional shapes of the pillar portions 6C may be different from each other.

When each through hole 6B of the skin portion 6 is partitioned by a plurality of pillar portions 6C as in the example of FIGS. 16 to 18, the width W6C of each pillar portion 6C constituting the skin portion 6 (FIG. 17, FIG. 18) may be uniform along the extending direction of the pillar portion 6C as in the example of the figure, or may be non-uniform along the extending direction of the pillar portion 6C. Further, the width W6C of each pillar portion 6C constituting the skin portion 6 may be the same between the pillar portions 6C as shown in the example of the figure, or may be different between the pillar portions 6C. The width W6C of each pillar portion 6C refers to the maximum width in the cross section when measured along the cross section perpendicular to each extending direction.
The maximum value of the width W6C of each pillar portion 6C constituting the skin portion 6 is preferably 3.0 mm or less from the viewpoint of ensuring the cushioning property of the porous structure 1 (and thus the seat pad 302), and 2 It is more preferable that the thickness is 5.5 mm or less. From the viewpoint of the durability of the skin portion 6, the minimum value of the width W6C of each pillar portion 6C constituting the skin portion 6 is preferably 0.05 mm or more, and more preferably 0.10 mm or more. ..
Similarly, the thickness T6 (FIG. 17) of the epidermis portion 6 may be uniform or non-uniform over the entire epidermis portion 6. The maximum value of the thickness T6 of the skin portion 6 is preferably 3.0 mm or less, and 2.5 mm or less, from the viewpoint of ensuring the cushioning property of the porous structure 1 (and thus the seat pad 302). More suitable. The minimum value of the thickness T6 of the skin portion 6 is preferably 0.05 mm or more, and more preferably 0.10 mm or more, from the viewpoint of the durability of the skin portion 6.
From the viewpoint of suppressing damage to the skeleton portion 2, the maximum value of the diameter of each through hole 6B of the epidermis portion 6 (the diameter of the through hole 6B having the largest diameter) is the average value of the diameters of the cell holes C of the skeleton portion 2. The following is preferable, and it is more preferable that the diameter is less than the average value of the cell holes C of the skeleton portion 2. When the shape of the through hole 6B when the skin portion 6 is viewed in a plan view is non-circular as in the example of FIG. 18, the “diameter” of the through hole 6B is the through hole 6B when the skin portion 6 is viewed in a plan view. It shall refer to the diameter of the circumscribed circle.

When each through hole 6B of the skin portion 6 is partitioned by a plurality of pillar portions 6C as in the examples of FIGS. 16 to 18, the area ratio of the through hole 6B in the skin portion 6 is determined from the viewpoint of improving air permeability. , 50% or more is preferable, and 70% or more is more preferable. Further, when each through hole 6B of the epidermis portion 6 is partitioned by a plurality of pillar portions 6C, the area ratio of the through hole 6B in the epidermis portion 6 is 99% or less from the viewpoint of improving the durability of the epidermis portion 6. It is preferable, and 95% or less is more preferable. The "area ratio of the through holes 6B in the epidermis 6" is the ratio of the total area A4 of all the through holes 6B provided in the epidermis 6 to the total area A3 of the epidermis 6 (A4 × 100 / A3 [A4 × 100 / A3]. %]). The "total area A3 of the skin portion 6" refers to the area of the portion surrounded by the outer edge of the skin portion 6, and includes the area occupied by the through hole 6B.

The configuration of the second embodiment described above and the configuration of the third embodiment described above may be combined.

[Seat pad according to the fourth embodiment]
Next, the seat pad 302 according to the fourth embodiment of the present invention will be described with reference to FIGS. 19 to 20, focusing on the points different from those of the first embodiment.
In the fourth embodiment, only the structure of the bone portion 2B of the skeleton portion 2 of the porous structure 1 constituting the seat pad 302 is different from that of the first embodiment.
In the fourth embodiment, the configuration of the skeleton line O and the like of the skeleton portion 2 and the configuration of the fluid passage 5 may be as described in the first embodiment. The porous structure 1 may or may not include the above-mentioned film 3 (FIG. 10).

19 to 20 are drawings for explaining a porous structure 1 suitable for forming the seat pad 302 according to the fourth embodiment. FIG. 19 is a plan view showing a part of the porous structure 1 constituting the seat pad 302 according to the fourth embodiment of the present invention, and is a drawing corresponding to FIG. 7. FIG. 20 shows the bone portion 2B of this example alone. FIG. 20 (a) shows a natural state in which no external force is applied to the bone portion 2B, and FIG. 20 (b) shows a state in which an external force is applied to the bone portion 2B. 19 and 20 show the central axis (skeleton line O) of the bone portion 2B.
As shown in FIGS. 19 and 20A, each bone portion 2B of the skeleton portion 2 extends while maintaining a constant cross-sectional area, respectively, in the extending direction of the bone constant portion 2B1 and the bone constant portion 2B1. It is composed of a pair of bone changing portions 2B2 extending from the bone constant portion 2B1 to the connecting portion 2J while gradually changing the cross-sectional area on both sides of the bone. In this example, each bone change portion 2B2 extends from the bone constant portion 2B1 to the joint portion 2J while gradually increasing the cross-sectional area. Not limited to this example, the same effect can be obtained even if only a part of the bone portions 2B constituting the skeleton portion 2 satisfies this configuration. In addition, some or all of the bone portions 2B constituting the skeleton portion 2 have the bone change portion 2B2 only at one end of the bone constant portion 2B1, and the bone constant portion 2B1 The other end may be directly coupled to the coupling portion 2J, and in that case, the same effect can be obtained, although the degree may vary.
Here, the cross-sectional areas of the bone constant portion 2B1 and the bone change portion 2B2 refer to the cross-sectional areas of the cross sections of the bone constant portion 2B1 and the bone change portion 2B2 perpendicular to the skeleton line O, respectively.
In this example, each bone portion 2B constituting the porous structure 1 is composed of a bone constant portion 2B1 and a bone change portion 2B2, and the cross-sectional area of the bone change portion 2B2 increases from the bone constant portion 2B1 to the joint portion 2J. Is gradually increased, so that the bone portion 2B has a constricted shape in the vicinity of the boundary between the bone constant portion 2B1 and the bone change portion 2B2 so as to become thinner toward the bone constant portion 2B1. Therefore, when an external force is applied, the bone portion 2B is likely to be buckled and deformed at the constricted portion and the intermediate portion of the bone constant portion 2B1, and the porous structure 1 is likely to be compressively deformed. As a result, the same behavior and characteristics as general polyurethane foam produced through the step of foaming by a chemical reaction can be obtained. Further, as a result, the touch feeling on the surface of the porous structure 1 becomes softer. Therefore, for example, when sitting, especially at the timing of starting to sit, the seated person is given a softer feel. Such a soft feel is generally preferred by those seated in luxury car seat pads (eg, seated in the backseat when carrying a person in the backseat with a driver). Is what is done.

As in this example, when the bone portion 2B has the bone constant portion 2B1 in at least a part thereof, the cross-sectional area A1 of the end 2B21 on either one side (preferably both sides) of the bone portion 2B (FIG. 20 (FIG. 20). The ratio A0 / A1 of the cross-sectional area A0 (FIG. 20 (a)) of the fixed bone portion 2B1 to a)) is
0.15 ≤ A0 / A1 ≤ 2.0
It is preferable that the above conditions are satisfied. As a result, the touch feeling on the surface of the porous structure 1 can be made not too soft, not too hard, and moderately hard as a characteristic of the seat pad. Therefore, for example, when sitting, especially at the timing of starting to sit, the seated person is given a feeling of moderate hardness. The smaller the ratio A0 / A1, the softer the touch feeling on the surface of the porous structure 1. If the ratio A0 / A1 is less than 0.15, the touch feeling on the surface of the porous structure 1 may become too soft, which may be unfavorable as a characteristic of the seat pad, and it is difficult to manufacture with a 3D printer. Therefore, it is not preferable in terms of manufacturability. When the ratio A0 / A1 is more than 2.0, the touch feeling on the surface of the porous structure 1 becomes too hard, which may be unfavorable as a characteristic of the seat pad.
The ratio A0 / A1 is more preferably 0.5 or more.
More specifically, in this example, the bone portion 2B has a bone constant portion 2B1 and a pair of bone change portions 2B2 continuous on both sides thereof, and each bone change portion 2B2 gradually increases its cross-sectional area. While increasing, it extends from the fixed bone portion 2B1 to the connecting portion 2J, and the ratio A0 / A1 is less than 1.0. As a result, the touch feeling on the surface of the porous structure 1 can be made relatively soft as a characteristic of the seat pad. Such a soft feel is generally preferred by those seated in luxury car seat pads (eg, seated in the backseat when carrying a person in the backseat with a driver). Is what is done.
It should be noted that each bone portion 2B constituting the skeleton portion 2 may satisfy this configuration, or only a part of the bone portions 2B among the bone portions 2B constituting the skeleton portion 2 satisfies this configuration. In either case, the same effect can be obtained, although the degree may vary.

Instead of this example, the bone change portion 2B2 may extend from the bone constant portion 2B1 to the joint portion 2J while gradually reducing the cross-sectional area. In this case, the bone constant portion 2B1 has a larger (thicker) cross-sectional area than the bone change portion 2B2. As a result, when an external force is applied, the fixed bone portion 2B1 is less likely to be deformed, and instead, the portion that is relatively easy to buckle becomes the bone changing portion 2B2 (particularly, the portion on the connecting portion 2J side), and thus the porous structure. The body 1 is less likely to be compressed and deformed. As a result, the touch feeling on the surface of the porous structure 1 becomes harder, and mechanical properties of high hardness can be obtained. Therefore, for example, when sitting, especially at the timing of starting to sit, the seated person is given a harder feel. Such behavior cannot be obtained with a general polyurethane foam produced through a step of foaming by a chemical reaction. Such a configuration can accommodate users who prefer a stiffer feel. Such a hard feel is preferred by the seated person, for example, in the seat pad of a sports car that performs quick acceleration / deceleration and change of diagonal line.
Then, when the bone changing portion 2B2 extends from the bone constant portion 2B1 to the connecting portion 2J while gradually reducing the cross-sectional area, the ratio A0 / A1 becomes more than 1.0.
It should be noted that each bone portion 2B constituting the skeleton portion 2 may satisfy this configuration, or only a part of the bone portions 2B among the bone portions 2B constituting the skeleton portion 2 satisfies this configuration. In either case, the same effect can be obtained, although the degree may vary.

In the example of FIGS. 6 to 9 described above in the first embodiment, the bone portion 2B does not have the bone change portion 2B2 and is composed of only the bone constant portion 2B1. In this case, the cross-sectional area of the bone portion 2 is constant over its entire length. Then, the touch feeling on the surface of the porous structure 1 when an external force is applied becomes moderate hardness. Such a configuration can accommodate users who prefer a medium hardness feel. In addition, it can be suitably applied to seat pads of all types of vehicles such as luxury cars and sports cars.
In this case, the ratio A0 / A1 is 1.0.
It should be noted that each bone portion 2B constituting the skeleton portion 2 may satisfy this configuration, or only a part of the bone portions 2B among the bone portions 2B constituting the skeleton portion 2 satisfies this configuration. In either case, the same effect can be obtained, although the degree may vary.

Returning to the examples of FIGS. 19 to 20, in this example, the bone constant portion 2B1 of each bone portion 2B constituting the skeleton portion 2 has a smaller cross-sectional area than the bone change portion 2B2 and the joint portion 2J. More specifically, the cross-sectional area of the fixed bone portion 2B1 is the cross-sectional area of each of the bone changing portion 2B2 and the connecting portion 2J (however, excluding the boundary portion between the bone constant portion 2B1 and the bone changing portion 2B2). Smaller than. That is, the fixed bone portion 2B1 is a portion having the smallest (thin) cross-sectional area in the skeleton portion 2. As a result, similarly to the above, when an external force is applied, the bone constant portion 2B1 is easily deformed, and by extension, the porous structure 1 is easily deformed by compression. As a result, the touch feeling on the surface of the porous structure 1 becomes softer.
The cross-sectional area of the connecting portion 2J refers to the cross-sectional area of the cross section perpendicular to the skeleton line O of the connecting portion 2J.
Not limited to this example, only a part of the bones 2B constituting the skeleton 2 may satisfy this configuration, and even in that case, the degree may vary. A similar effect can be obtained.

Similarly, in this example, in each bone portion 2B constituting the skeleton portion 2, the bone constant portion 2B1 is smaller in width than the bone change portion 2B2 and the joint portion 2J. More specifically, the width of the bone constant portion 2B1 is larger than the width of each of the bone change portion 2B2 and the joint portion 2J (excluding the boundary portion between the bone constant portion 2B1 and the bone change portion 2B2). ,small. That is, the fixed bone portion 2B1 is the narrowest (thin) portion in the skeleton portion 2. This also makes it easier for the bone constant portion 2B1 to be deformed when an external force is applied, whereby the touch feeling on the surface of the porous structure 1 becomes softer.
The widths of the bone constant portion 2B1, the bone change portion 2B2, and the joint portion 2J were measured along the cross section perpendicular to the skeleton line O of the bone constant portion 2B1, the bone change portion 2B2, and the joint portion 2J, respectively. Refers to the maximum width in the cross section. The skeleton line O of the connecting portion 2J is a portion of the skeleton line O corresponding to the connecting portion 2J. FIG. 20A shows the width W0 of the bone constant portion 2B1 and the width W1 of the bone change portion 2B2 for reference.
Not limited to this example, only a part of the bones 2B constituting the skeleton 2 may satisfy this configuration, and even in that case, the degree may vary. A similar effect can be obtained.

In each of the above examples, the width W0 (FIG. 20) of the bone constant portion 2B1 is 0.05 mm or more from the viewpoint of simplification of the structure of the porous structure 1 and thus the ease of manufacturing a 3D printer. It is preferable to have it, and it is more preferable to have it of 0.10 mm or more. When the width W0 is 0.05 mm or more, modeling is possible with the resolution of a high-performance 3D printer, and when the width W0 is 0.10 mm or more, modeling is possible not only with the resolution of a high-performance 3D printer but also with the resolution of a general-purpose 3D printer.
On the other hand, from the viewpoint of improving the accuracy of the outer edge (outer contour) shape of the porous structure 1, reducing the gap (interval) between the cell holes C, and improving the characteristics as a cushioning material, The width W0 (FIG. 20) of the fixed bone portion 2B1 is preferably 0.05 mm or more and 2.0 mm or less.
It is preferable that each bone portion 2B constituting the skeleton portion 2 satisfies this configuration, but only a part of the bone portions 2B constituting the skeleton portion 2 satisfies this configuration. In that case, the same effect can be obtained, although the degree may vary.

As shown in FIG. 20, in this example, each bone portion 2B constituting the skeleton portion 2 has one or a plurality (three in this example) inclined surfaces 2B23 on the side surface of each bone changing portion 2B2. The inclined surface 2B23 is inclined (inclined at less than 90 °) with respect to the extending direction of the bone changing portion 2B2, and the width W2 gradually increases from the bone constant portion 2B1 toward the connecting portion 2J. Is increasing.
As a result, when an external force is applied, the bone portion 2B is easily buckled and deformed at the constricted portion near the boundary between the bone constant portion 2B1 and the bone change portion 2B2, and as a result, the porous structure 1 is compressed. It becomes easy to deform. As a result, the touch feeling on the surface of the porous structure 1 becomes softer.
Here, the extending direction of the bone changing portion 2B2 is the extending direction of the central axis (skeleton line O) of the bone changing portion 2B2. Further, the width W2 of the inclined surface 2B23 of the bone changing portion 2B2 refers to the width of the inclined surface 2B23 when measured along the cross section perpendicular to the skeleton line O of the bone changing portion 2B2.
Not limited to this example, only a part of the bones 2B constituting the skeleton 2 may satisfy this configuration, and even in that case, the degree may vary. A similar effect can be obtained.

In this example, each bone portion 2B constituting the skeleton portion 2 has a columnar shape, and the bone constant portion 2B1 and the bone change portion 2B2 have equilateral triangular cross-sectional shapes.
This simplifies the structure of the porous structure 1 and facilitates modeling with a 3D printer. In addition, it is easy to reproduce the mechanical properties of a general polyurethane foam produced through a process of foaming by a chemical reaction. Therefore, the characteristics of the porous structure 1 as a cushioning material can be improved. Further, by forming the bone portion 2B in a columnar shape in this way, the durability of the porous structure 1 can be improved as compared with the case where the bone portion 2B is replaced with a thin film-like portion.
The cross-sectional shapes of the bone constant portion 2B1 and the bone change portion 2B2 are shapes in a cross section perpendicular to the central axis (skeleton line O) of the bone constant portion 2B1 and the bone change portion 2B2, respectively.
Not limited to this example, only a part of the bones 2B constituting the skeleton 2 may satisfy this configuration, and even in that case, the degree may vary. A similar effect can be obtained.
Further, in all or part of the bone portions 2B constituting the skeleton portion 2, the bone constant portion 2B1 and the bone change portion 2B2 have polygonal shapes other than the equilateral triangle (equilateral triangle). Other than triangles, quadrangles, etc.), or circular (round, oval, etc.) may be used, and even in that case, the same effect as in this example can be obtained. Further, the bone constant portion 2B1 and the bone change portion 2B2 may have different cross-sectional shapes. Further, each bone portion 2B may have a uniform cross-sectional shape along the extending direction thereof, or may be non-uniform along the extending direction thereof. Further, the cross-sectional shapes of the bone portions 2B may be different from each other.

The configuration of the bone portion 2B of the skeleton portion 2 in the above-described fourth embodiment may be applied to the bone portion 2B of the skeleton portion 2 of any of the first embodiment, the second embodiment, and the third embodiment. Good.

The seat pad manufacturing method, seat pad, and 3D modeling data of the present invention are preferably used for any vehicle seat and any vehicle seat pad, and in particular, a vehicle seat and a vehicle seat pad. It is suitable to be used in.

300: Vehicle seat,
302: Seat pad,
310: Cushion pad, 311: Main pad part (seating part), 311t: Lower thigh, 311h: Lower buttock, 312: Side pad part, 313: Back pad facing part,
320: Back pad, 321: Main pad, 322: Side pad,
330: Epidermis,
340: Headrest,
5: Fluid passage, 51: First opening (opening), 52: Second opening (opening), 53: Main passage, 54a to 54e: Branch passage, 55: Intermediate passage, 56: Branch part,
P, P1, P2: junction,
FS: Seated side surface (front surface), SS: Side surface, BS: Back surface, Ga to Gb: Groove,
TD: thickness direction, LD: extension direction,
1: Porous structure,
2: Skeleton part, 2B: Bone part, 2Be: Bone part end, 2B1: Bone constant part, 2B2: Bone change part, 2B21: Bone change part joint side end, 2B22: Bone constant part of bone change part End on the part side, 2B23: Inclined surface of bone change part, 2J: Joint part, 21: Cell compartment part, 211: Ring part, 211L: Large ring part, 211S: Small ring part, 2111: Inner circumference side of ring part Edge,
3: Membrane,
6: Epidermis, 6B: Through hole, 6C: Pillar, 6Ce: End of pillar,
7A: Part near the fluid passage, 7B: Part other than the part near the fluid passage C: Cell hole, O: Skeleton line, V1: Virtual surface, V1L: Large virtual surface, V1S: Small virtual surface 400: 3D printer, 410: Control Part, 420: Modeling part, 421: Laser irradiator, 430: Support stand, 440: Container, LL: Ultraviolet laser light, LR: Liquid resin, 500: Data for 3D modeling

Claims (11)

A method for manufacturing a seat pad composed of a porous structure.
Includes a modeling step of modeling the seat pad using a 3D printer.
The porous structure is made of a flexible resin or rubber.
The seat pad is for fluid to pass from a first opening that opens to the outer surface of the seat pad to a second opening that extends inside the seat pad and opens to the outer surface of the seat pad. Has a fluid passage and
A method for manufacturing a seat pad, wherein the second opening of the fluid passage is open to a seater-side surface of the seat pad. The method for manufacturing a seat pad according to claim 1, wherein the fluid passage has a plurality of branch passages. The method for manufacturing a seat pad according to claim 1 or 2, wherein each of the plurality of branch aisles has the second opening that opens to the seater-side surface of the seat pad. The seat pad is configured as a cushion pad.
The cushion pad has a lower buttock configured to support the buttock portion of the seated person from below.
The method for manufacturing a seat pad according to any one of claims 1 to 3, wherein the second opening of the fluid passage is open to the seater-side surface of the lower buttock. The seat pad is configured as a back pad.
The back pad has a main pad portion configured to support the back of the seated person from the rear side.
The method for manufacturing a seat pad according to any one of claims 1 to 3, wherein the second opening of the fluid passage is open to the seater-side surface of the main pad portion. The manufacture of a seat pad according to any one of claims 1 to 5, wherein the first opening of the fluid passage is open to a surface other than the seating side surface of the outer surface of the seat pad. Method. The porous structure includes a skeleton portion and has a skeleton portion.
The skeleton is
With multiple bones
A plurality of joints, each of which connects the ends of the plurality of bones,
Consists of
The skeleton portion has a cell partition portion that internally partitions the cell hole.
Each of the cell compartments has a plurality of annular portions configured in an annular shape.
The plurality of annular portions are connected to each other so that the virtual surfaces partitioned by the respective inner peripheral side edges do not intersect with each other.
The cell hole is partitioned by the plurality of annular portions and the plurality of virtual surfaces on which the plurality of annular portions are partitioned.
The method for manufacturing a seat pad according to any one of claims 1 to 6, wherein the annular portion is composed of a plurality of the bone portions and the plurality of joint portions. A seat pad composed of a porous structure.
The seat pad was modeled using a 3D printer.
The porous structure is made of a flexible resin or rubber.
The seat pad is for fluid to pass from a first opening that opens to the outer surface of the seat pad to a second opening that extends inside the seat pad and opens to the outer surface of the seat pad. Has a fluid passage and
The second opening of the fluid passage is a seat pad that opens to the seater-side surface of the seat pad. The porous structure includes a skeleton portion and has a skeleton portion.
The skeleton is
With multiple bones
A plurality of joints, each of which connects the ends of the plurality of bones,
Consists of
The seat pad according to claim 8, wherein the bone portion has a circular or polygonal cross-sectional shape. The porous structure includes a skeleton portion and has a skeleton portion.
The skeleton is
With multiple bones
A plurality of joints, each of which connects the ends of the plurality of bones,
Consists of
The bone portion has, in at least a part thereof, a bone constant portion extending while maintaining a constant cross-sectional area.
The ratio A0 / A1 of the cross-sectional area A0 of the fixed bone portion to the cross-sectional area A1 of one end of the bone portion is
0.15 ≤ A0 / A1 ≤ 2.0
The seat pad according to claim 8 or 9, which satisfies the above conditions. This is 3D modeling data that is read into the control unit of the 3D printer when the modeling unit of the 3D printer performs modeling.
Data for 3D modeling in which the control unit is configured to cause the modeling unit to model the seat pad according to any one of claims 8 to 10.

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