Tubular article having an annular groove therein

Details Tubular article having an annular groove therein Tubular article having an annular groove therein

B - Operations, Transporting

29

D

18/935

B29D 23/00 (2006.01)

Patent

CA 1178761

ABSTRACT OF THE DISCLOSURE A tubular article having a peripheral groove is formed by providing the groove in the wall of a tubular blank made of thermoplastic material such as polyethylene terephthalate by applying simultaneously a pressure against the wall of the blank and axial stretching forces. In the bottom of the groove, the material is drawn to yielding and the blank is simulta- neously elongated.

447780

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