External treatment, e.g. by using air rings for cooling tubular films

Full Title

Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor (extrusion blow-moulding B29C49/04) > Component parts, details or accessories; Auxiliary operations > Thermal treatment of the stream of extruded material, e.g. cooling > External treatment, e.g. by using air rings for cooling tubular films