B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/103, 88/97.1
B29C 47/02 (2006.01) G02B 6/44 (2006.01) B29C 47/00 (2006.01)
Patent
CA 1103494
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 sheath 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.
279884
Fetherstonhaugh & Co.
Telephone Cables Limited
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