Plastic and nonmetallic article shaping or treating: processes – Treating shaped or solid article – To shrink
Patent
1981-10-13
1983-11-15
Czaja, Donald E.
Plastic and nonmetallic article shaping or treating: processes
Treating shaped or solid article
To shrink
264235, 2642358, 2642896, 264346, 4274123, B29C 2500
Patent
active
044155239
ABSTRACT:
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.
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Barham Peter J.
Odell Jeffrey A.
Willmouth Frank M.
Czaja Donald E.
Imperial Chemical Industries plc
Thompson W.
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