B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/978, 204/91.3
B29C 61/06 (2006.01) H02G 15/18 (2006.01)
Patent
CA 1173620
A B S T R A C T A process for the production of a heat shrinkable article which comprises forming bonds between regions of at least two superimposed lengths of polymeric material to produce a bonded article so disposed that the desired direction of heat shrinkability lies along the length of the bonded article, cross-linking the bonded article and the bonds between the said lengths of polymeric material, heating the bonded article, stretching the bonded article longitudinally and cooling it (which may comprise allowing it to cool naturally in the stretched condition) to render the articles heat shrinkable. Pneumatic or other methods of expansion may be used in addition to the stretching to render hollow articles heat-shrinkable the combination of stretch- ing and another such method being advantageous in achieving high expansion ratios while maintaining a reasonable degree of symmetry in the finished hollow recoverable articles.
385998
Fetherstonhaugh & Co.
Raychem Limited
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