Stretching process

Details Stretching process Stretching process

B - Operations, Transporting

29

C

18/538

B29C 47/90 (2006.01) B29C 47/00 (2006.01)

Patent

CA 1072710

ABSTRACT OF THE DISCLOSURE The Specification describes a process for producing transversely stretched hollow strips of thermoplastic synthetic resin having a non- circular cross-section which comprises passing a hollow strip of a thermo- plastic synthetic resin in the thermoplastic state, said strip having a non-circular cross-section, through a stretching chamber, the transverse cross-sectional area of which increases, in the direction of travel of the said strip, to a size corresponding to the desired degree of transverse stretching of the strip, the hollow strip containing an inert gas under a pressure serving to press the strip against the walls of the said chamber whereby the strip is transversely stretched according to the cross-sectional area of the chamber; the stretched strip being subse- quently cooled to a temperature below the softening temperature of the said resin.

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