Channeled insulation for telecommunication cable

Patent metadata

Field	Value
Publication number	US-10566110-B2
Application number	US-201816019895-A
Country	US
Kind code	B2
Filing date	Jun 27, 2018
Priority date	Jun 29, 2017
Publication date	Feb 18, 2020
Grant date	Feb 18, 2020

Abstract

The present disclosure relates to a telecommunications cable. The telecommunication cable includes a plurality of twisted pairs of insulated wires extending substantially along a longitudinal axis of the telecommunications cable. Each insulated wire of the plurality of twisted pairs of insulated wires includes a conductor and an insulation surrounding the conductor. The insulation includes a first insulation layer defining a plurality of channels disposed around a peripheral surface of the conductor. In addition, the insulation includes a second insulation layer disposed circumferentially around the first insulation layer. Moreover, the insulation includes a third insulation layer disposed circumferentially around the second insulation layer. Furthermore, the telecommunication cable includes a separator and a first layer defining the outer jacket of the telecommunication cable.

First claim

What is claimed is:

1. An insulation for a conductor, wherein the insulation comprising:
a first insulation layer defining a plurality of channels disposed around a peripheral surface of the conductor, wherein the first insulation layer comprises a first circumferential wall and a second circumferential wall spaced radially inwardly from the first circumferential wall, wherein the plurality of channels is defined between the second circumferential wall and the peripheral surface of the conductor;
a second insulation layer disposed circumferentially around the first insulation layer; and
a third insulation layer disposed circumferentially around the second insulation layer.

2. The insulation as recited in claim 1 , wherein the first insulation layer is formed of a material selected from a group consisting of solid polyolefin, polypropylene and fluorinated ethylene propylene and wherein the first insulation layer has a first radial thickness in a range of about 0.01 millimeters to 0.07 millimeters.

3. The insulation as recited in claim 1 , wherein the second insulation layer is formed of a material selected from a group consisting of solid or foamed polyolefin, solid or foamed polypropylene and fluorinated ethylene propylene and wherein the second insulation layer has a second radial thickness in a range of about 0.17 millimeters to 0.3 millimeters.

4. The insulation as recited in claim 1 , wherein the third insulation layer is formed of a material selected from a group consisting of solid polyolefin, polypropylene and fluorinated ethylene propylene and wherein the third insulation layer has a third radial thickness in a range of about 0.01 millimeters to 0.07 millimeters.

5. The insulation as recited in claim 1 , wherein each of the plurality of channels has a cross-sectional shape selected from a group consisting of sinusoidal, semicircular, square, rectangular, trapezoidal and arched.

6. The insulation as recited in claim 1 , wherein the plurality of channels disposed around the peripheral surface of the conductor is in a number range of about 3 to 12.

7. The insulation as recited in claim 1 , wherein the second insulation layer is disposed around the first insulation layer such that the second insulation layer is in substantially continuous contact with the first circumferential wall of the first insulation layer.

8. A telecommunication cable comprising:
a plurality of twisted pairs of insulated wires extending substantially along a longitudinal axis of the telecommunications cable, wherein each insulated wire of the plurality of twisted pairs of insulated wires comprises:
at least one conductor, wherein the conductor is made of copper;
an insulation surrounding the conductor, wherein the insulation comprises a first insulation layer defining a plurality of channels disposed around a peripheral surface of the conductor, a second insulation layer disposed circumferentially around the first insulation layer, a third insulation layer disposed circumferentially around the second insulation layer, wherein the first insulation layer comprises a first circumferential wall and a second circumferential wall spaced radially inwardly from the first circumferential wall, wherein the plurality of channels is defined between the second circumferential wall and the peripheral surface of the conductor;
a separator for separating each twisted pair of insulated wire of the plurality of twisted pairs of insulated wires; and
a first layer surrounding the separator and the plurality of twisted pairs of insulated wires along the length of the telecommunications cable.

9. The telecommunication cable as recited in claim 8 , wherein the conductor has a cross sectional diameter in a range of about 0.49 millimeters to 0.69 millimeters.

10. The telecommunication cable as recited in claim 8 , wherein the first insulation layer is formed of a material selected from a group consisting of solid polyolefin, polypropylene and fluorinated ethylene propylene, wherein the first insulation layer has a first radial thickness in a range of about 0.01 millimeters to 0.07 millimeters.

11. The telecommunication cable as recited in claim 8 , wherein the second insulation layer is formed of a material selected from a group consisting of solid or foamed polyolefin, solid or foamed polypropylene and fluorinated ethylene propylene, wherein the second insulation layer has a second radial thickness in a range of about 0.17 millimeters to 0.3 millimeters.

12. The telecommunication cable as recited in claim 8 , wherein the third insulation layer is formed of a material selected from a group consisting of solid polyolefin, polypropylene and fluorinated ethylene propylene and wherein the third insulation layer has a third radial thickness in a range of about 0.01 millimeters to 0.07 millimeters.

13. The telecommunication cable as recited in claim 8 , further comprising one or more ripcords placed inside a core of the telecommunications cable and lying substantially along the longitudinal axis of the telecommunications cable, the one or more ripcords facilitate stripping of the first layer, wherein the one or more ripcords is made of a material selected from a group consisting of nylon and polyester based twisted yarns.

14. The telecommunication cable as recited in claim 8 , wherein each of the plurality of channels between the second circumferential wall and the peripheral surface of the conductor defines a void space containing at least one of air, nitrogen and carbon dioxide.

15. The telecommunication cable as recited in claim 8 , wherein the telecommunication cable has a cross-sectional outer diameter in a range of 5 millimeters to 9 millimeters.

16. The telecommunication cable as recited in claim 8 , wherein the plurality of channels has a cross-sectional shape selected from a group consisting of sinusoidal, semicircular, square, rectangular, trapezoidal and arched.

17. The telecommunication cable as recited in claim 8 , wherein the plurality of channels disposed around the peripheral surface of the conductor is in a number range of about 3 to 12.

18. An insulation for conductor, wherein the insulation comprising:
a first insulation layer defining a plurality of channels disposed around a peripheral surface of the conductor, wherein the first insulation layer comprises a first circumferential wall and a second circumferential wall spaced radially inwardly from the first circumferential wall, wherein the plurality of channels is defined between the second circumferential wall and the peripheral surface of the conductor, wherein the first insulation layer is formed of a material selected from a group consisting of solid polyolefin, polypropylene and fluorinated ethylene propylene and wherein the first insulation layer has a first radial thickness in a range of about 0.01 millimeters to 0.07 millimeters;
a second insulation layer disposed circumferentially around the first insulation layer, wherein the second insulation layer is formed of a material selected from a group consisting of solid or foamed polyolefin, solid or foamed polypropylene and fluorinated ethylene propylene and wherein the second insulation layer has a second radial thickness in a range of about 0.17 millimeters to 0.3 millimeters; and
a third insulation layer disposed circumferentially around the second insulation layer, wherein the third insulation layer is formed of a material selected from a group consisting of solid polyolefin, polypropylene and fluorinated ethylene propylene and wherein the third insulation layer has a third radial thickne

Assignees

• Sterlite Tech Ltd

Inventors

• Kaczmarski Andrew
• Bhatt Darshana
• Dube Avnish

Classifications

• H01B11/12

  Arrangements for exhibiting specific transmission characteristics · CPC title

• H01B11/002

  Pair constructions · CPC title

• H01B7/0291

  comprising two or more layers of insulation having different electrical properties · CPC title

• H01B7/0275 Primary

  comprising one or more extruded layers of insulation · CPC title

• H01B7/0233 Primary

  Cables with a predominant gas dielectric · CPC title