Colour-coded cellular insulation

B - Operations – Transporting – 29 – C

Patent

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B29C 44/34 (2006.01) B29C 44/32 (2006.01) C08J 3/22 (2006.01) C08J 9/10 (2006.01) H01B 13/14 (2006.01)

Patent

CA 1103871

ABSTRACT OF THE DISCLOSURE A method is provided for producing a cable con- ductor wire insulated with a colour-coded, cellular thermo- plastic electrically insulating polymer material in extruded form, in which a thermoplastic electrically insulating polymer material and a predetermined amount of a pelletized material comprising predetermined amounts of a particulate pigment composition and of a particulate, solid blowing agent in a polymer matrix compatible with said insulating polymer material are introduced into a screw extruder, the mixture is heated and sheared in the extruder to melt the polymer material and form an intimate mixture of the pig- ment composition and the blowing agent in the polymer mate- rial; the blowing agent thermally decomposes to a gaseous product, and the molten mixture is forced from the extruder and about a moving conductor wire to form an extruded coating, the extruded coating expands a predetermined amount, to form the conductor wire insulated with colour- coded, cellular thermoplastic electrically insulating polymer material; a plurality of such conductor wires can be formed into a multi-conductor communication cable in which the colour-coded conductors are dielectrically matched.

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