US 12,304,178 B2
Cushion material and cushion material manufacturing method
Taichi Itabashi, Tokyo (JP); Yukiko Yamaguchi, Tokyo (JP); Satoshi Ienaga, Tokyo (JP); and Yoshiyuki Takahashi, Tokyo (JP)
Assigned to Archem Inc., Tokyo (JP)
Appl. No. 17/756,826
Filed by Archem Inc., Tokyo (JP)
PCT Filed Dec. 7, 2020, PCT No. PCT/JP2020/045542
§ 371(c)(1), (2) Date Jun. 3, 2022,
PCT Pub. No. WO2021/117690, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 2019-225211 (JP), filed on Dec. 13, 2019.
Prior Publication US 2023/0012495 A1, Jan. 19, 2023
Int. Cl. B32B 25/04 (2006.01); B32B 5/18 (2006.01); B32B 27/06 (2006.01); B32B 27/40 (2006.01)
CPC B32B 25/045 (2013.01) [B32B 5/18 (2013.01); B32B 27/065 (2013.01); B32B 27/40 (2013.01); B32B 2266/0278 (2013.01); B32B 2307/50 (2013.01); B32B 2307/724 (2013.01); B32B 2601/00 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A cushion material comprising:
a foam body having a surface portion formed of an air permeability control surface portion and an air permeability uncontrol surface portion; and
a covering material comprising a sol substance, having an air permeability lower than that of the air permeability uncontrol surface portion, and configured to cover the air permeability uncontrol surface portion,
wherein the surface portion covers one of all faces of the foam body, wherein a surface air permeability of the air permeability control surface portion is 25 cc/cm2/sec or less as measured in compliance with JIS K 6400,
wherein a surface air permeability of the air permeability uncontrol surface portion is not controlled,
wherein a surface of the air permeability control surface portion has a small percentage of opening portions in which cell membranes are not formed on a cell frame compared to closed portions in which cell membranes are formed on the cell frame without breaking,
wherein a surface of the air permeability uncontrol surface portion has a small percentage of closed portions in which cell membranes are formed on the cell frame without breaking compared to opening portions in which cell membranes are not formed on the cell frame,
wherein the air permeability control surface portion and the air permeability uncontrol surface portion are on an identical face of the foam body,
wherein the foam body is in the shape of hexahedron, the identical face of foam body is one face among the six faces of the foam body, wherein a surface portion of remaining five faces consists of the air permeability control surface portion,
wherein the air permeability uncontrol surface portion includes an edge formed in the foam body,
wherein the covering material covers the edge of the identical face of the foam body such that the portion of the identical face of the foam body other than the edge thereof is free of the covering material.