Method and apparatus for processing extruded thermoplastic material for use in siding by advancing the extrudate from the die member through a series of baths which size and shape the extrudate. The process sizes and cools the extrudate, and, thence, heat treats the extrudate followed by a final quenching...http://www.google.es/patents/US4247506?utm_source=gb-gplus-sharePatente US4247506 - Processing extruded elastomers
