Stretching process

Details Stretching process Stretching process

B - Operations, Transporting

29

C

18/1042, 18/747

B29C 55/30 (2006.01) B29C 33/60 (2006.01) B29C 47/94 (2006.01) B29C 55/18 (2006.01) B29C 35/00 (2006.01)

Patent

CA 1125971

ABSTRACT OF THE DISCLOSURE A process for the biaxial stretching of a length of thermoplastic synthetic resin which comprises passing the said length, wherein at least the surface thereof is in the thermoelastic state, through a forming zone comprising forming means which serve to reduce a transverse dimension of the said length and to increase the transverse dimension of the said length at right angles to the first-mentioned transverse dimension whereby a biaxially stretched length of the said synthetic resin is produced, and subsequently passing the length through a cooling zone in which the length is cooled to below the softening point of the said resin while maintaining the reduction in the first-mentioned transverse dimension achieved by passage through the said forming means.

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