Mold, molding machine, and foamed molded body manufacturing method

Patent metadata

Field	Value
Publication number	US-9808968-B2
Application number	US-201214360409-A
Country	US
Kind code	B2
Filing date	Jun 7, 2012
Priority date	Nov 30, 2011
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

A mold, a molding machine, and a foamed molded body manufacturing method are provided that are capable of more reliably preventing ingress of foamed resin into a gas discharge hole using a gas-impermeable member and capable of adequately discharging gas inside the cavity to the cavity outside through the gas discharge hole during foam molding, and that are also capable of achieving good design characteristics in a foamed molded body. A gas discharge hole 5 is provided at a cavity 4 inner face of a mold 1 and discharges gas inside the cavity 4 to outside the cavity 4 . A gas-permeable member 6 is disposed inside the cavity 4 of the mold 1 so as to cover the gas discharge hole 5 , and a gas-impermeable member 8 is disposed on the gas discharge hole 5 side of the gas-permeable member 6 so as to face the gas discharge hole 5 . A portion of the gas discharge hole 5 , spanning at least from axial direction intermediate portion of the gas discharge hole 5 to the cavity 4 side of the gas discharge hole 5 , is configured with a tapered profile portion 5 a that increases in diameter on progression toward the cavity 4 side.

First claim

The invention claimed is:

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.

2. The foamed molded body manufacturing method of claim 1 , wherein:
the gas-impermeable member is adhered to the gas-permeable member using a pressure-sensitive adhesive or bonding agent; and
the pressure-sensitive adhesive or bonding agent does not contain organic solvent, or any organic solvent contained in the pressure-sensitive adhesive or bonding agent is present in an amount of 0.5% by mass or lower of the total mass of the adhesive or bonding agent.

3. The foamed molded body manufacturing method of claim 1 , wherein the gas-impermeable member is configured from a pulp, or from a laminated body of a pulp and an SBR resin.

4. The foamed molded body manufacturing method of claim 1 , wherein the foamed molded body is a seat pad.

5. The foamed molded body manufacturing method of claim 2 , wherein the foamed molded body is a seat pad.

6. The foamed molded body manufacturing method of claim 3 , wherein the foamed molded body is a seat pad.

Assignees

• Yonezawa Taisuke
• Ohashi Yoshinori
• Bridgestone Corp

Inventors

• Yonezawa Taisuke
• Ohashi Yoshinori

Classifications

• B29C33/10

  with incorporated venting means · CPC title

• B29C44/586

  with a cavity increasing in size during foaming · CPC title

• B29C44/588 Primary

  with means for venting, e.g. releasing foaming gas · CPC title

• B29C44/587

  with a membrane, e.g. for pressure control · CPC title