| 摘要 |
PURPOSE:To manufacture a thick foam at favorable energy efficiency andproduction efficiency without necessitating cooling of a mold, by leaving reserve capacity for expansion to the foam which is heated under compression. CONSTITUTION:An intermediate primary foam is obtained by a method wherein a foamable polyolefin series resin composite containing a crosslinking agent and chemical foaming agent is heated under pressurization for a fixed period of time and the same is decompressed under a state wherein the foaming agent is decomposed partly. The obtained intermediate primary foam is made to expand so that the foaming agent is turned into a state wherein a part of the same, desirably 1-60% of the same is undecomposed by heating the foaming agent under normal pressure, and reserve capacity for expansion is made to remain. The remaining foaming agent is made to decompose by heating the foam under this state further under a pressurized state of the mold and the foam is obtained by releasing the mold without cooling the same. With this method, as there is no cooling process energy efficiency is favorable. |
