Air ring for cooling blown plastic film

Details Air ring for cooling blown plastic film Air ring for cooling blown plastic film

B - Operations, Transporting

29

C

B29C 47/90 (2006.01) B29C 47/88 (2006.01) B29C 47/92 (2006.01)

Patent

CA 2246468

An air ring for supplying cooling air to a hot extruded plastic film after the film has been extruded from an annular extrusion die at an elevated temperature has an annular body which surrounds the tubular film after the film has left the extrusion die. The said body has a circumferentially extending air passage through which air can be supplied from an external source and which directs cooling air from the passage between the body and the film. A circumferentially extending series of individually operable actuators are each operable to vary the flow of cooling air to cause the film to become nearer to or further from the body at its circumferential location to cause the thickness of the film at said location to decrease or increase.

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