Insulating tinsel conductors

Details Insulating tinsel conductors Insulating tinsel conductors

B - Operations, Transporting

29

C

18/753, 18/772

B29C 47/02 (2006.01) H01B 3/42 (2006.01) H01B 13/14 (2006.01)

Patent

CA 1093267

INSULATING TINSEL CONDUCTORS Abstract of the Disclosure An insulation comprising a polyether polyester thermoplastic copolymer obtained by reacting 1, 4 butane diol terephthalate with terepthalate esters of polytetra- methylene glycol is coated over an irregularly configured conductor, such as for example, a tinsel conductor, suitable for use in telecommunications cordage by moving the copolymer through an extruder and along a flow path formed between a core tube and wall of a die cavity. The die cavity adjacent to the throat of the die has a frustoconical portion formed . with an approach angle of sufficient magnitude to minimize the pressure drop through the extruder to extrude the co- polymer at a temperature slightly above the melting point of the copolymer. The copolymer is tubed over the tinsel conductor with a gas at a controlled volume rate of flow being moved through the core tube with the tinsel conductor to expand the copolymer extrudate as it flows out of the die opening to cool the extrudate and to facilitate advantageously oriented crystalline growth of the copolymer. Subsequently, the insulation is drawn down about the tinsel conductor with a slight spacing therefrom while treating the insulation with water at a predetermined temperature to anneal the insulation in a predetermined manner.

272469

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