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Cable with foamed plastic insulation comprising an ultra-high die swell ratio polymeric material

A technology of foamed plastics and die expansion, applied in the direction of plastic/resin/wax insulators, insulated cables, insulators, etc., can solve the problem of increasing the initial investment cost of materials, increasing the complexity of production methods, and cable electrical purity (poor loss factor) Impact and other issues

Inactive Publication Date: 2006-06-07
COMMSCOPE INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such layers are known to add complexity to the production process and increase initial investment costs and ongoing material usage
In addition, high die expansion materials are inherently electrically unfavorable, thus adversely affecting the electrical purity (dissipation factor) of the cable

Method used

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  • Cable with foamed plastic insulation comprising an ultra-high die swell ratio polymeric material
  • Cable with foamed plastic insulation comprising an ultra-high die swell ratio polymeric material
  • Cable with foamed plastic insulation comprising an ultra-high die swell ratio polymeric material

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Embodiment Construction

[0022] The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. Indeed, the invention may encompass many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements. Like reference numerals refer to like elements throughout.

[0023] figure 1 An insulated electrical communication element of the invention, implemented in the form of a coaxial cable 10, is illustrated. The coaxial cable comprises a cable core 11 comprising an inner conductor 12 of a suitable electrically conductive material, surrounded by a continuous cylindrical wall of expanded foam insulating material 14 . The insulating material 14 is an expanded cellular foam composition. Preferably the pores of the insulating material 14 are of a closed pore struct...

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Abstract

An electrical communication element having a conductor and a foamed plastic insulation around the conductor, said insulation comprising at most 20% by weight, preferably about 15% by weight, of at least one ultra high die swell polymer (UHDSRP) Element. The UHDSRP is defined as having a die swell greater than 55%, more preferably a die swell greater than 65%. The insulator also preferably comprises at least one second component that is highly resistant to stress cracking, such that combining these polymers (minimum) will produce an insulating layer with a unique combination of physical properties resulting in a high degree of foaming, microscopic , uniform pore structure, and produces characteristic low attenuation and resistance to stress cracking, when crimped at a stress level of 1 times the outer diameter of the insulator at 100 ° C, it will not show defects (cracking) for longer than 100 hours ).

Description

technical field [0001] This invention relates broadly to telecommunication cables, and more particularly to cables comprising high expansion foam having uniform, fine and closed cell properties. Background technique [0002] Yuto and Suzuki (US Pat. Nos. 4,547,328 and 4,683,166) have taught that by adding at least 20% by weight of a plastic having a die swell (DSR) of at least 55% to the polymer mix, certain advantages can be achieved in the production of coaxial cables. Specifically, the addition of a polymer having a die swell of at least 55% increases the flexibility of the molten polymer, allowing better control over the process of wrapping the wire with the foam insulation. The teaching indicates that said advantages result from a high degree of foaming (expansion), and a pore structure of the foamed polymer less than or equal to 50 microns. Microporous structures with high expansion rates are desirable for properties such as low electrical loss (attenuation), low mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B3/44B29C44/32H01B7/00H01B7/285H02B7/00
CPCH01B3/441H01B7/285H01B7/2855H01B11/1839H01B13/14
Inventor 道格拉斯·J·布卢埃迪·R·休斯顿
Owner COMMSCOPE INC
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