Pipe molding apparatus with molding tunnel air turbulence

摘要

An extruding apparatus which extrudes continuous length of hollow plastic product has an extruder ( 3 ) which feeds molten plastic through die equipment ( 5 ) to a mold tunnel ( 7 ) formed by side by side moving mold blocks ( 9 ). The apparatus includes air turbulence internally of the product within the mold tunnel to assist in setting shape of the product. The air turbulence is provided by an air moving member ( 17 ) located internally of the product within the mold tunnel and a power source for the air moving member. The power source is located externally of the mold tunnel and a power transfer is provided to feed power from the power source through the die equipment to the air moving member without cooling of the die equipment.