The invention relates to power cable polymer composition which comprises a single site polyethylene (SSPE), a power cable, for example, a high voltage direct current (HV DC), a power cable polymer insulation, use of a polymer composition for producing a layer of a power cable, and a process for producing a power cable.

The present disclosure relates to an impact resistant, multipolar power cable (10) comprising, a plurality of cores (1), each core (1) comprising at least one conductive element (3) and an electrical insulating layer (5) in a position radially external to the at least one conductive element (3). The cores (1) are stranded together so as to form an assembled element providing a plurality of interstitial zones (2). An expanded polymeric filler (6) fills the interstitial zones (2) between the plurality of cores (1). An expanded impact resistant layer (7) is in a position radially external to the expanded polymeric filler (6) and comprises a polymer that differs from the expanded polymeric filler (6).

An extruder assembly comprising a barrel, through which a conductor can travel; a first subassembly for extruding a first sleeve on the conductor; and a second subassembly for extruding a second sleeve onto the first sleeve, the second sleeve comprising a first portion, a second portion, and a cross-section comprising a first annulus sector and a second annulus sector, the first portion comprising the first annulus sector, the second portion comprising the second annulus sector, the first and second portions are in contact with the first sleeve.

A cable includes a jacket, a shielding tape, a pair of wires, an inner and outer jacket layer, and a separator. The shielding tape includes a substrate and a plurality of conductive shield segments disposed on the substrate. The pair of wires form a twisted pair. The inner and outer jacket layers are extruded onto inner and outer surfaces, respectively, of the substrate. The substrate, the inner jacket layer and the outer jacket layer are bonded together into a single layer that defines a circumference. Each of the conductive shield segments: extends only partially around the circumference of the single layer; is longitudinally spaced from each longitudinally adjacent one of the conductive shield segments; is radially spaced from, and overlaps a portion of, each immediately circumferentially adjacent one of the conductive shield segments; and is embedded in at least one of the inner jacket layer and the outer jacket layer.

A method for making a high-temperature winding cable is winding a tinned copper line around a coaxial line, signal lines and power lines after being assembled together, lapping the rim of the tinned copper line with a packaging material of Polytetrafluoroethene, and then, extruding an insulating layer of thermoplastic material on the rim of the packaging material, and finally, extruding an outer cover of fluororubber on the outer rim of the insulating layer, thereby forming a cable; sintering the cable; winding the sintered cable clockwise around and fixing it to a iron bar; cooling the wound cable; and finally, taking down the wound cable from the iron bar by rewinding it counterclockwise so as to obtain a high-temperature winding cable. The winding cable so made is not melt, damaged, and retains elasticity after the impact of high temperature 260 C.

High reliability power cables for subsea application are provided. Example power cables provide enhanced resistance to partial discharge dielectric breakdown as well as resistance to explosive gas decompression, by eliminating micro-defects and voids at the interface between the insulation layer and the barrier layer during the cable manufacturing process. Lead metal, which is conventionally extruded as a primary barrier layer, is replaced in the example power cables by a gas-and-fluid-resistant thermoplastic that is co-extruded or tandem extruded with surface-modified insulation to promote bonding between the two layers. Elimination of lead metal in the example power cables also significantly reduces their overall weight. The improved resistance to partial discharge and resistance to rapid gas decompression translates to lower workover and lower cost of ownership.

An insulated electric conductor with increased adhesion of an insulating coating includes an electric conductor, preferably made of copper or aluminum, with an insulating coating having either at least one insulating layer made of thermoplastic material, or the insulating layer and a plastic-containing intermediate layer, obtainable by a method in which the electric conductor is placed under a protective gas atmosphere and is bombarded with ions of the protective gas in a gas plasma in order to remove an oxide layer formed on a surface of the electric conductor and/or to increase the surface energy of the electric conductor, and subsequently either the at least one insulating layer or, in the case that the coating includes the plastic-containing intermediate layer, at least the plastic-containing intermediate layer is applied directly to the surface of the electric conductor under a protective gas atmosphere.

A foamed electric wire includes a conductor, and a covering layer that covers the conductor and is constituted by one or more layers. At least one layer of the covering layer is a foamed covering layer made of a resin composition containing a polypropylene resin, that is formed by foam extrusion molding. An average foam diameter of the foamed covering layer is 30 m or less in a cross-sectional direction, and 60 m or less in a longitudinal direction. A foaming ratio of the foamed covering layer is 25% or more and 55% or less. An arithmetic average height of a surface of the foamed electric wire is 20 m or less.

Cables are constructed with extruded discontinuities in the cable jacket that allow the jacket to be torn to provide access to the cable core. The discontinuities can be longitudinally extending strips of material in the cable jacket.

A method of manufacturing a cable with an electrical and/or optical transmission element containing core, which is surrounded by a cover of insulation material is indicated. Generated on the outer side of the cable on its entire length is at least one in the axial direction running strip composed of insulation material, which has a different color than the cover has. The material of the cover and the strip are applied by means of an extruder through co-extrusion simultaneously on the core of the cable so that the material of the strips is integrated into the material of the cover. The material of the cover and strips are applied by means of an extruder which has an inner flow channel and one surrounding all-around outer flow channel which merge. In the outer flow channel is arranged an all-around existing barrier constructed as a ring, that has at least one passage for the required material for a strip. The material of the strips is with pressure forced through the passage and pushed or pressed in the inner flow channel, through which the material for the cover is guided, as a result of which the material of the strips is imprinted or pressed into the material of the cover and thereby is tightly bound with the same or anchored in the same.