System for coextruded innerduct with filled outer layer
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United States of America Patent
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Aug 24, 1993
Grant Date -
N/A
app pub date -
Jan 23, 1992
filing date -
Jan 23, 1992
priority date (Note) -
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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.
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