Method and apparatus for manufacturing a watertight optical fibe

Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Utilizing plasma – electric – electromagnetic – particulate – or...

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Details

264174, 425114, 4251331, 425145, 425463, B29D 1100

Patent

active

044091540

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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patent: 4172106 (1979-10-01), Lewis
patent: 4218551 (1980-08-01), Frese
patent: 4219639 (1980-08-01), Mack et al.
patent: 4221756 (1980-09-01), Piper
patent: 4239871 (1980-12-01), Fukui

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