Method of applying a strippable outer semiconductive layer on an insulated cable conductor
AssigneeASEA Aktiebolag
InventorsGunnar Jansson, Gustaf Linderoth
Life of this patent
Estimating the term…
Abstract
In cables where the conductor is provided with an insulation of thermoplastic or cross-linked polyethylene, the insulation may be covered with a strippable outer semiconductive layer consisting of a cross-linked polymer composition which comprises a copolymer of ethylene and vinyl acetate and further carbon black and an organic peroxide. The strippable layer is applied on the conductor insulation by extrusion of the polymer composition in an extrusion machine and by a subsequent crosslinking in the polymer composition.
Claims11
In a method of applying a strippable semiconductive layer to a cable conductor which has an insulation therearound of thermoplastic or crosslinked polyethylene by extruding thereon a polymer material comprising a copolymer of ethylene and vinyl acetate, carbon black and an organic peroxide in an extrusion machine, the improvement wherein said organic peroxide is uniformly mixed with a mixture of said copolymer and said carbon black to form said polymer material after said mixture of said copolymer and said carbon black have been supplied to said extrusion machine, and heating said polymer material after the polymer material has been extruded into said insulated cable conductor so as to cause cross-linking.
Dependencies are inferred from the claim text.