Paper pulp insulated cable and method of manufacture
AssigneeNorthern Telecom Limited
InventorsThomas C. Pound, Eric J. Gouldson
Life of this patent
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Abstract
A paper pulp insulated cable of the kind having a plurality of conductors covered with paper pulp insulation. The insulated conductors are twisted into pairs, the pairs are stranded into units and the units are built up into cores, covered with, for example, a paper wrap, aluminum, steel sheath and a polyethylene jacket. The cable has a high density of conductors. Also a method of manufacturing such cables is described.
Claims21
A paper insulated cable comprising a plurality of conductors each surrounded by paper pulp insulation, pairs of said conductors being twisted together, and groups of said pairs being stranded together, and outer sheathing and jacket, said conductors of the pairs exhibiting a capacitance of ##EQU3## where C=mutual capacitance=0.083 microfarads/mile
- .epsilon..sub.ins =dielectric constant of the paper pulp insulation =1.47 to 1.69
- s=diameter of the insulated conductor
- d=diameter of the conductor, and 2s/d=3.2 to 3.4.
A paper pulp insulated cable comprising at least several hundred copper conductors of 28 AWG, paper pulp insulation surrounding each conductor, said insulated conductors being twisted into pairs, stranded into units, and cabled, a sheath encasing said cabled insulated conductors, and a jacket thereon, said paper pulp insulation having a density of approximately 0.44 grams/cm.sup.3, a thickness of approximately 4 mils, and said wires of each pair having a mutual capacitance of approximately 0.083 microfarads/mile.
A paper pulp insulated cable comprising at least several hundred copper conductors of 26 AWG, paper pulp insulation surrounding each conductor, said insulated conductors being twisted into pairs, stranded into units, and cabled, a sheath encasing said cabled insulated conductors, and a jacket thereon, said paper pulp insulation having a density of approximately 0.42 grams/cm.sup.3, a thickness of approximately 5 mils, and said wires of each pair having a mutual capacitance of approximately 0.083 microfarads/mile.
A paper pulp insulated cable comprising at least several hundred copper conductors of 24 AWG, paper pulp insulation surrounding each conductor, said insulated conductors being twisted into pairs, stranded into units, and cabled, a sheath encasing said cabled insulated conductors, and a jacket thereon, said paper pulp insulation having a density of approximately 0.39 grams/cm.sup.3, a thickness of approximately 7 mils, and said wires of each pair having a mutual capacitance of approximately 0.083 microfarads/mile.
A paper pulp insulated cable comprising at least several hundred copper conductors of 22 AWG, paper pulp insulation surrounding each conductor, said insulated conductors being twisted into pairs, stranded into units, and cabled, a sheath encasing said cabled insulated conductors, and a jacket thereon, said paper pulp insulation having a density of approximately 0.39 grams/cm.sup.3, a thickness of approximately 8.6 mils, and said wires of each pair having a mutual capacitance of approximately 0.083 microfarads/mile.
A paper pulp insulated cable comprising at least several hundred copper conductors of 19 AWG, paper pulp insulation surrounding each conductor, said insulated conductors being twisted into pairs, stranded into units, and cabled, a sheath encasing said cabled insulated conductors, and a jacket thereon, said paper pulp insulation having a density of approximately 0.37 grams/cm.sup.3, a thickness of approximately 10.2 mils, and said wires of each pair having a mutual capacitance of approximately 0.83 microfarads/mile.
Dependencies are inferred from the claim text.