N.k.f. Groep B.v.

Albertus T Grooten

A gas-tight and moisture-tight, mechanically strong signal transmission cable having a cable core and a cable sheath which comprises a metal tape folded around the core and having a minimum thickness of 100 .mu.m, a layer of polyethylene adhering to the tape, a layer of polyamide-11 or polyamide-12, an armoring of reinforcing wires or tapes, and a synthetic resin outer sheath.

Signal transmission cable

An armored cable and a method of manufacturing an armored cable, said cable having a helically wrapped zinc-plated steel armor. The steel armor band has zinc protective layer on its two sides, and uncoated edges, to reduce manufacturing costs and improve cathodic protection. The zinc protective layer thereby comprises a first layer portion consisting of a zinc-iron alloy and a second layer portion, on top of said first layer portion consisting of essentially pure unalloyed zinc and having a thickness of at least 90% of the total layer thickness.

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Waddinxveen, Netherlands

Albertus T Grooten