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Foamed separator splines for data communication cables

A technology for separating racks, communication cables, used in insulated cables, cables with double-stranded/quad-stranded, cables, etc., can solve problems such as fire and smoke hazards

Inactive Publication Date: 2015-05-13
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, materials such as polyolefins present fire and smoke hazards, especially when used in electrical environments

Method used

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  • Foamed separator splines for data communication cables
  • Foamed separator splines for data communication cables
  • Foamed separator splines for data communication cables

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0075] The purpose of these embodiments is to create extruded shapes from foamed polyetherimide (PEI) that can be used as split racks in cable construction.

[0076] Materials are shown in Table A.

[0077] Table A

[0078]

[0079]

[0080] Techniques and steps

[0081] Using a twin-screw extruder and standard polyetherimide compounding conditions, ULTEM 1000 was combined with 0.5% by weight talc to produce the compound for subsequent extrusion trials to produce foamed parts.

Embodiment 1

[0084] Embodiment 1 (comparative embodiment)

[0085] Polyetherimide (PEI), commercially available as ULTEM 1000 from SABIC Innovative Plastics, was used as the baseline without blowing agent or introduced air bubbles (pure resin). Under the conditions specified above, PEI was fed to an Akron single screw extruder to obtain a "+"-shaped extrudate with a relative linear density of 100%, an apparent specific gravity of 1.27, and a density reduction of 0%. The weight of a 1 meter length of extrudate is 4.6669 grams. Its properties are listed in Table 1.

Embodiment 2

[0087] The same PEI as used in Example 1 was combined with blowing agent ((ULTEM FUL-C20 from SABIC Innovative Plastics) in an amount of 11.4 g / 4540 g PEI). It was then extruded in an Akron single screw extruder under the conditions specified above. The resulting extrudate exhibited a relative linear density of 91%, an apparent specific gravity of 1.23 and a density reduction of 3%. It shows slightly foamy. Its properties are listed in Table 1.

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Abstract

A separator spline formed of a foamed, halogen-free polymeric material for separating twisted pairs of conductors is described. The isolator may take the shape of an "X", a +, a rod, a star configuration, a tube or a flat rectangular shape, with the isolator separating twisted pairs of conductors. In the case of the "X"-shape, the twisted pairs are separated by the arms of the X. The halogen-free polymeric material is preferably selected from a resin selected from the group of polyetherimide (PEI), polyetherimide / polysiloxane copolymer, elastomer-modified-polyphenylene-ether blend, and combinations thereof. The isolator and twisted pairs are preferably part of a communication cable and being covered with a sheath.

Description

Background technique [0001] Disclosed herein are foamed electrically insulating separator splines for telecommunication cables, telecommunication cables incorporating same, methods of production thereof and applications of such cables. [0002] Current communication cables are formed from "twisted pairs" of conductors, usually metallic conductors, such as copper wires. These electrical conductors may each be covered with a non-conductive covering, such as synthetic polymers, natural or synthetic rubber, and blends of non-conductive materials. The resulting individual electrical conductors are then formed into twisted pairs in which at least two conductors are twisted to form an interlaced helix of conductors. When used to form a communication cable, typically 4 twisted pairs are arranged around an electrically insulating insulator. Such insulators are hereinafter collectively referred to as "separator splines". In particular, the "split rack" is an insulator having a four-a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B7/295
CPCH01B7/295H01B11/06H01B19/04H01B17/14
Inventor 格伦·罗伯特·特赖森布赖恩·赖斯
Owner SABIC GLOBAL TECH BV
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