System for coextruded innerduct with filled outer layer

Details System for coextruded innerduct with filled outer layer System for coextruded innerduct with filled outer layer

1992-01-23

1993-08-24

Taylor, Dennis L.

Hydraulic and earth engineering

Subterranean or submarine pipe or cable laying, retrieving,...

138141, 174 683, 405 15, F16L 100

Patent

active

052383288

ABSTRACT:
A coextruded innerduct which would include an outer layer of polyethylene, impregnated or filled with a filler material, such as calcium carbonate, talc, microglass beads or strands, or any material which would reduce the contraction and expansion properties of the polyethylene innerduct in relation to the properties of the outer casing, and an inner layer of unfilled polyethylene innerduct which would provide for a smooth surface, to lower the coefficient of friction between itself and the fiber optic cables being pulled therethrough. There is further provided a lubricity agent added to the inner layer, and the innerduct is positioned as part of a multi-cell system when installed for use.

REFERENCES:
patent: 4289716 (1981-09-01), Voigt
patent: 4299256 (1981-11-01), Bacehowski et al.
patent: 4410476 (1983-10-01), Redding et al.
patent: 4688890 (1987-08-01), DeMeo et al.
patent: 4806289 (1989-02-01), Laursen et al.
patent: 4892442 (1990-01-01), Shoffner
patent: 5027864 (1991-07-01), Conti et al.
patent: 5087153 (1992-02-01), Washburn

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