Apparatus for heat-setting a tubular article of crystallizable p

Details Apparatus for heat-setting a tubular article of crystallizable p Apparatus for heat-setting a tubular article of crystallizable p

1986-03-07

1987-12-08

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Including both heating and cooling means

264523, 4253871, 425393, 425526, B29C 5522

Patent

active

047116242

ABSTRACT:
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.

REFERENCES:
patent: 3182355 (1965-05-01), Arnaudin, Jr.
patent: 4005968 (1977-02-01), Crawford
patent: 4155694 (1979-05-01), Savioli
patent: 4277231 (1981-07-01), Gordon
patent: 4405546 (1983-09-01), Jakobsen et al.
patent: 4511322 (1985-04-01), Jakobsen et al.
patent: 4518340 (1985-05-01), Jakobsen et al.
patent: 4545951 (1985-10-01), Gordon

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