Plastic foam injection mould - with fine channel structures on inner surfaces for venting excess blowing agent gas

摘要

Plastic foam injection mouldings with surfaces free from streaks are produced by venting the entire gas produced by the blowing agent between the surface of the plastic and the surface of the mould. The inside surfaces of both parts of the mould are treated chemically, electrically or mechanically to produce fine channel structures of 10-100.