Method of making a foamed insulation coaxial cable for hyperfreq

Details Method of making a foamed insulation coaxial cable for hyperfreq Method of making a foamed insulation coaxial cable for hyperfreq

1984-09-25

1987-05-05

Dawson, Robert A.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

156 51, 15624412, 174110F, 174110FC, 427119, B29C 4702

Patent

active

046630953

ABSTRACT:
The invention concerns a method for producing a coaxial cable intended for the transmission of very high frequency signals. This coaxial cable comprises a dielectric insulating layer composed of foamed polytetrafluoroethylene or a composition comprising at least 80% of this product named hereinafter COMPOUND. The layer of insulating material is directly obtained by cold extrusion of a COMPOUND powder, the intimate mixing of a pore-forming agent and a foaming agent and a lubricating oil. The mixing of the COMPOUND powder, the pore-forming and foaming agents is effected dry or in aqueous dispersion. Principal application: Fields of use of ultra-high frequencies such as radars and transmissions.

REFERENCES:
patent: 3410932 (1968-11-01), Woodson et al.
patent: 3522089 (1970-07-01), Takada et al.
patent: 4368350 (1983-01-01), Perelman
patent: 4529564 (1985-07-01), Harlow
patent: 4560829 (1985-12-01), Reed et al.

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