METHOD AND APPARATUS FOR PRODUCING A FINNED TUBE FROM SYNTHETIC PLASTICS MATERIAL

摘要

An apparatus for producing a finned tube from synthetic plastics material has a moulding chamber which moves in the direction of production. Molten synthetic plastics charge enters this moulding chamber from which fins are moulded one after another, the fins being in each case formed individually one after another. In order to ensure this procedural measure, there are constructed in the surface of the molten plastics material present in the moulding chamber annular raised portions with conveying surfaces trailing in the direction of production. Corresponding conveying grooves are constructed in the half moulds which bound the moulding chamber. These measures ensure an accurate contour of the tube which is to be produced, ensuring that a reverse flow of molten plastics charge and its combustion will be prevented.