Dimensionally stable thermoplastic open-ended tubular articles

Details Dimensionally stable thermoplastic open-ended tubular articles Dimensionally stable thermoplastic open-ended tubular articles

B - Operations, Transporting

29

C

18/935

B29C 55/22 (2006.01) B29C 49/48 (2006.01) B29C 71/02 (2006.01)

Patent

CA 1250721

-18- ABSTRACT OF THE DISCLOSURE For making open-ended thermoplastic tubular articles, which are dimensionally stable up to elevated temperatures, an open-ended polymer tube is placed between a fixed, heated external mould and a cooled mandrel, which is vertically displaceable relative to the mould, both the ends of the polymer tube being clamped to restrain the tube axially. The polymer tube is radially expanded into contact with the hot mould and maintained in contact for a time sufficient to ensure dimensional stability, and then allowed to shrink back into contact with the cooled mandrel, which is maintained at a temperature below the glass transistion temperature of the polymer. The resulting article is then stripped from the mandrel.

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