for achieving a non-uniform temperature distribution, e.g. using barrels having both cooling and heating zones

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 extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling > for achieving a non-uniform temperature distribution, e.g. using barrels having both cooling and heating zones