Aftrækningsindretning til et slangefolieekstruderingsanlæg og fremgangsmåde til fremstilling af en slangefoliebane af formstof

摘要

A reversing bar (1) comprises hollow supporting tube (10) with outer surface (F) over which film strip is guided. The outer surface comprises an air permeable microporous layer (15) with a pore size of 5-100Microm. Perforations (100) in the tube wall enable compressed air to flow from the interior of the tube to the microporous layer.