Cooling mandrel for blown film moulding station, blown film moulding station and method for manufacturing a blown film

摘要

A foil sleeve blower has an aperture through which the sleeve foil is expelled. At the core is a cooling plug (1) whose outer cavity-walled mantle (9) incorporates an annular (16) cooling duct (34) with an air-feed (14). The annular air duct has an air inlet and an air outlet. The cooling plug (1) takes the form of an inverted truncated cone. Further claimed are a commensurate foil sleeve cooling process and assembly, and a process to manufacture thermoplastic foil sleeve.