A NOVEL FORM OF THERMAL BARRIER FOR COMMUNICATIONS CABLES,
Abstract
The development and testing of a new and economical form of thermal barrier, which has thermal characteristics superior to those of core wraps currently in use, is described. In one recommended form, it comprises a foamable coating adherent to one side of the metal tape which is used as the cable shield. The coating may either be prefoamed immediately prior to jacketing by the use of external heat or be caused to foam by the heat of the extruded jacket itself. A laboratory test technique has been developed to estimate the core and shield temperatures generated during the jacketing process, and comparison is made with the temperatures calculated theoretically. The results of comparative tests, based on this laboratory technique are tabulated for all the common forms of thermal barrier proposed for use in communications cable. Reference is made to factory trials utilizing this form of barrier in a jacketed cable construction. These trials confirm the beneficial effect of the high thermal resistance and low thermal capacitance of the new thermal barrier. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1965
- Accession Number
- AD0479561
Entities
People
- G. E. Clock
- H. A. Walters
- P. C. Woodland
- R. C. Mildner