Method and apparatus for manufacturing a watertight optical fiber cable
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United States of America Patent
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Oct 11, 1983
Grant Date -
N/A
app pub date -
Feb 4, 1981
filing date -
Feb 6, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of manufacturing an optical fiber cable of the type which compri at least one cellular cylindrical structure of plastic material having a plurality of longitudinal bores housing individual optical fibers and filled with a viscous substance. The viscous substance is injected around the fibers under pressure as they pass along tubes which each have a gap of some length so that said viscous substance can enter the tubes. The optical fibers coated with viscous substance are made to protrude beyond the ends of said tubes. A thermoplastic material is simultaneously extruded through an annular orifice and around the optical fibers under a pressure which is sufficient to completely surround said coated optical fibers. The cylindrical structure thus obtained is rapidly cooled.
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