Asea Aktiebolag

Allmanna Svenska Elektriska Aktiebolaget

Gunnar Jansson

Gustaf Linderoth

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.

Method of applying a strippable outer semiconductive layer on an

An object of cross-linked polymer, such as insulation for a cable conductor or a cable sheath, is formed by using a starting material containing a peroxide and a polymer material with the ability to undergo a cross-linking reaction in the presence of peroxide. The reaction is carried out during at least a part of the process in the presence of a substance which has the ability to undergo a color change during the cross-linking reaction of the polymer material so that a color change of the substance is obtained. There may also be added a dye which does not have the ability to undergo a color change during the cross-linking of the polymer material. The substance may be an aromatic compound containing at least one halogen atom and/or at least one heterocyclic ring in which ring there is at least one nitrogen atom to which no hydrogen atom is linked.

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Alvsjo, Sweden

Gunnar Jansson