Accession Number:

ADP002542

Title:

Equipment and Design Changes in Extrusion of Foamed Fluoropolymer Resins,

Personal Author(s):

Corporate Author:

DU PONT DE NEMOURS (E I) AND CO WILMINGTON DEL

Report Date:

1983-11-17

Abstract:

Recent growth of computer networks has increased the market for foamed coaxial cables. To meet this need, the gas injection process for foaming of Teflon FEP and PFA fluorocarbon resins introduced in 1981 at the 30th Wire and Cable Symposium has been refined. Advances in die and extruder screw design have broadened capability from 500 CATV coaxial cable to miniature wire sizes. Increased processing speeds and higher core quality have been achieved. These coaxial cables have a unique combination of properties that are maintained over a wide range of temperatures and signal frequencies. They have dielectric constants as low as 1.3 and low flame spread and smoke generation as tested to UL 910. These cables are now widely used for high frequency signal transmission in compliance with the National Electric Code for installation without conduit in building air handling plenums. Military applications represent newer areas of interest with weight and space savings and high electrical quality. The characteristics of several coaxial cables are reviewed. Author

Supplementary Note:

This article is from 'Proceedings of the International Wire and Cable Symposium (32nd) Held at Cherry Hill, New Jersey on November 15, 16 and 17, 1983', AD-A136 749, p111-118.

Pages:

0008

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File Size:

0.00MB

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