US 9,808,968 B2
Mold, molding machine, and foamed molded body manufacturing method
Taisuke Yonezawa, Yokohama (JP); and Yoshinori Ohashi, Yokohama (JP)
Assigned to BRIDGESTONE CORPORATION, Tokyo (JP)
Appl. No. 14/360,409
Filed by Taisuke Yonezawa, Yokohama (JP); and Yoshinori Ohashi, Yokohama (JP)
PCT Filed Jun. 7, 2012, PCT No. PCT/JP2012/064681
§ 371(c)(1), (2), (4) Date May 23, 2014,
PCT Pub. No. WO2013/080589, PCT Pub. Date Jun. 6, 2013.
Claims priority of application No. 2011-262361 (JP), filed on Nov. 30, 2011.
Prior Publication US 2014/0312521 A1, Oct. 23, 2014
Int. Cl. B29C 44/58 (2006.01); B29C 33/10 (2006.01)
CPC B29C 44/588 (2013.01) [B29C 33/10 (2013.01); B29C 44/587 (2013.01); B29C 44/586 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A foamed molded body manufacturing method for manufacturing a foamed molded body configured from a foamed synthetic resin, employing a mold, the mold comprising:
a gas discharge hole that is provided at a cavity inner face of the mold and that discharges gas inside a cavity to outside the cavity;
a gas-permeable member that is disposed inside the cavity so as to cover the gas discharge hole; and
a gas-impermeable member that is disposed on a gas discharge hole side of the gas-permeable member so as to face the gas discharge hole,
wherein a portion of the gas discharge hole, spanning at least from an intermediate portion in the axial direction of the gas discharge hole to a cavity side of the gas discharge hole, is configured with a tapered profile portion that increases in diameter on progression toward the cavity side, the foamed molded body manufacturing method comprising:
a gas-permeable member and gas-impermeable member placement process of disposing the gas-permeable member inside the cavity of the mold so as to cover the gas discharge hole, and disposing the gas-impermeable member on the gas discharge hole side of the gas-permeable member so as to the face the gas discharge hole; and
a foam molding process of foaming a foamable synthetic resin raw material inside the cavity after the gas-permeable member and gas-impermeable member placement process,
wherein:
the gas-impermeable member is configured in a sheet form extending along a gas discharge hole side face of the gas-permeable member; and
the gas-impermeable member has a thickness of from 0.05 mm to 0.2 mm, a tensile strength of from 30N/15 mm to 90N/15 mm as specified by JIS-Z-0237, and an elongation percentage of from 1% to 10% as specified by JIS-Z-0237.