Contact cooling cage for blown film tubing - having diameter and cooling rate adjustable mechanically or manually

摘要

Several cooling bodies, with coolant flowing through them, encompass the blown film and guide it along the contact cooling stretch whereby each cooling body is arranged on a common support with a common setting device, in which the bodies are formed as straight rigid tubes arranged between two annular coaxial supports and flexibly coupled between them such that a hyperboloid coolant cage is formed whose dia. can be varied by twisting the supports relative to each other. Pref. a setting device twists the supports to control the angle of the cooling cage in relation to a measuring device arranged in front of the cooling cage to gauge the film dia.