Process for reducing micro-voids in the extruded insulation of electric cables
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United States of America Patent
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-
Mar 31, 1981
Grant Date -
N/A
app pub date -
Apr 17, 1979
filing date -
Apr 19, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process for reducing micro-voids in cross-linked cable insulation without reducing the voltage breakdown strength thereof in which process the insulation, after cross-linking, is heated at a temperature in the range from about 120.degree. C. to about 150.degree. C. and under a pressure less than 10 mm. Hg for a period from about 8 hours to 48 hours. Also, a cable having such insulation which has micro-voids less than about 10.sup.2 per mm.sup.3 and a perforation gradient greater than the perforation gradient of a cable which has not been so treated.
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