Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Utilizing plasma – electric – electromagnetic – particulate – or...
Patent
1977-06-06
1979-10-23
Corbin, John K.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Utilizing plasma, electric, electromagnetic, particulate, or...
264209, 350 9623, 350320, 425381, B29D 1100
Patent
active
041721063
ABSTRACT:
In an optical fibre cable having a core of one or more straight optical fibre waveguides, with or without a textile sleeve, the protective sheat surrounding the core consists of a plastic tube incorporating reinforcing tensile material in its wall, the relative proximity of the fibres, the sleeve if present, and the sheath being such as to permit freedom of movement of the fibres in relation to the sheath, in both radial and axial directions. The preferred form of reinforcement consists of elongate tensile members, such as steel wires, embedded in the sheath wall, equally spaced apart and lying parallel to the core. The reinforced sheath is formed by a single continuous extrusion step, the reinforcing members being fed into the extruded plastic material simultaneously with the feeding of the cable core into the bore of the extruded sheath. Preferably the optical fibres, especially if unsleeved, are introduced into the sheath bore through a stationary inner tube inserted through and beyond the central duct of the extruder head, to prevent adhesion of the fibres to the soft extrudate.
REFERENCES:
patent: 4022603 (1977-05-01), Roeder et al.
patent: 4100008 (1978-07-01), Claypoole
Corning Glass Works, "Optic Cable", Optics and Laser Technology, vol. 7, No. 4, Aug. 1975, p. 150.
Corbin John K.
Lee John D.
Telephone Cables Limited
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