| 摘要 |
Closed-cell foam molded parts or articles of crosslinked polyolefin are manufactured according to a process comprising the steps of filling a foamable and crosslinkable polyolefin composition containing a blowing agent and a crosslinking agent into a closed mold and molding a correspondingly shaped, foamable product under pressure, the crosslinking reaction progressing without decomposition of the blowing agent; subsequent heating of the resultant foamable, crosslinked product to a blowing temperature between a pair of metal plates, wherein the product can expand biaxially within the region left between the metal plates; and then heating of the thus-obtained intermediate product under low pressure of about 1 bar so that it can expand into all directions with complete decomposition of the residual blowing agent to result in the completely foamed molded part. |
