Kanjofuirumuoseizosurufuirumuburoohetsudo

摘要

In a blowhead for producing tubular film from thermoplastic material flowing from an extruder, a central supply conduit branches into a plurality of radial distributing passages having their axes in substantially one plane. Each distributing passage extends into an axial passage portion that is parallel to the supply conduit and that opens into a distributing helix. Inlet and outlet tubes for cooling air are provided between the axial distributing passage portions.