Patent ID: 6551534
Filing Date: 2003-04-22
Classification: B29C,Y02P

Abstract:
A method for preparing an extruded hollow product comprising:(a) extruding material by feeding the material into an extruder, said extruder comprising at least one stator and at least one rotatable rotor for forcing the material from a supply side of the extruder onto a mandrel at an exit side of the extruder, the mandrel and the at least one stator defining an orifice that gives form to the extruded hollow product; and (b) sucking air through the extruded hollow product such that the air is sucked through one end of the product, contacts an inner surface of a wall of the product and cools the product and such that the air is then sucked through the extruder from an output end to an opposite second end and reduces a temperature of the extruder sufficiently to mitigate against overheating due to friction of material forced between the rotor and stator.