Method for manufacturing pipe e.g. cable guide tube made of thermoplastic material, involves setting bulk temperature of intermediate layer on outlet side of mold, below melt temperature of pipe inner wall and/or outer pipe wall

摘要

The method involves forming three layers in pipe. The tube inner wall, foamed intermediate layer and a tubular outer wall are made of same material. The intermediate layer is foamed by physical and/or chemical blowing agent. The bulk temperature of the produced intermediate layer on the outlet side of mold is set below the melt temperature of the produced pipe inner wall and/or outer pipe wall.