B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/1170
B29C 71/02 (2006.01) C08J 5/18 (2006.01)
Patent
CA 1148714
ABSTRACT OF THE DISCLOSURE: The invention provides a method of heat-treating a biaxially oriented polyolefin film by constraining the film against shrinkage, heating the constrained film to at least the minimum stress relaxation temperature of the polyolefin, and thereafter cooling the treated film to a temperature below the alpha-relaxation temperature of the polyolefin. The film is preferably heated rapidly to the required temperature and cooled rapidly therefrom. The resultant films exhibit good modulus and thermal shrinkage characteristics. The heat treatment may be supplemented by a conventional heat-setting operation to improve heat- sealing characteristics of the treated films.
357740
Barham Peter J.
Odell Jeffrey A.
Willmouth Frank M.
Barlow Charles Brian
Imperial Chemical Industries Plc
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