INNER COOLING BODY FOR A BLOWN FILM EXTRUDER, BLOWN FILM EXTRUDER COMPRISING SAID INNER BODY AND METHOD FOR OPERATING SAID BLOWN FILM EXTRUDER

摘要

The formation of paraffin condensate on an inner cooling body of a blown film extruder can be either avoided or allowed in a controlled manner and then removed, thereby reducing damages to the film tube or even avoiding them. In an inner cooling body for a blown film extrusion line, the inner cooling body includes a shell around which a blown film tube, coming from the annular die, can ascend against gravity or can descend with gravity when the blown film extrusion line is running. The shell has a fraction condensate diverter for keeping paraffin condensate or any other condensate away from potential contact points of the blown film tube on the shell.