INNER COOLING BODY FOR A BLOWN FILM EXTRUSION LINE, BLOWN FILM EXTRUSION LINE COMPRISING SUCH AN INNER COOLING BODY AND METHOD FOR OPERATING SAID BLOWN FILM EXTRUSION LINE

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.