Abstract: A cable has a tensile armor having a number of elongated polymeric tensile elements. At least one of the elongated polymeric tensile elements includes a bundle of high tensile fibers and a jacket tightly retaining the bundle of fibers. The elongated polymeric tensile elements are arranged with a lay loss of 1.5% at most. A method of manufacturing such a cable is also disclosed.

Abstract: A cable has a tensile armor having a number of elongated polymeric tensile elements. At least one of the elongated polymeric tensile elements includes a bundle of high tensile fibers and a jacket tightly retaining the bundle of fibers. The elongated polymeric tensile elements are arranged with a lay loss of 1.5% at most. A method of manufacturing such a cable is also disclosed.

Abstract: A cable has a tensile armor having a number of elongated polymeric tensile elements. At least one of the elongated polymeric tensile elements includes a bundle of high tensile fibers and a jacket tightly retaining the bundle of fibers. The elongated polymeric tensile elements are arranged with a lay loss of 1.5% at most. A method of manufacturing such a cable is also disclosed.

Abstract: A cable has a tensile armor having a number of elongated polymeric tensile elements. At least one of the elongated polymeric tensile elements includes a bundle of high tensile fibers and a jacket tightly retaining the bundle of fibers. The elongated polymeric tensile elements are arranged with a lay loss of 1.5% at most. A method of manufacturing such a cable is also disclosed.

Abstract: An electric power cable contains a core and a jacket forming the exterior of the cable. The jacket is formed by extruding a first layer and a second layer over a plurality of concentric neutral elements, substantially encapsulating these elements. At least the first layer is an expanded polymeric material, by having its density reduced through the use of a foaming agent during extrusion. The second layer, which may also be expanded, is extruded around the first layer. The expanded polymeric material makes stripping the jacket easier, minimizes indentations in the cable's insulation layers, lightens the cable, and increases the cable's flexibility.

Abstract: Process for manufacturing a cable comprising the following steps:(a) conveying at least one conductor to an extruder apparatus;(b) extruding an insulating coating layer radially external to said at least one conductor; (c) longitudinally folding a metal tape around said extruded insulating coating layer, said metal tape bearing at least one adhesive coating layer in a radially external position; (e) extruding at least one continuous coating layer comprising at least one polyamide or a copolymer thereof around and in contact with said folded metal tape; wherein the step (e) is carried out at a draw down ratio (DDR) not higher than 2.5, preferably of from 1.2 to 2.0.

Abstract: A process for manufacturing a self-extinguishing cable including at least one transmissive element and at least one flame-retardant coating in a position radially external to the at least one transmissive element, wherein the at least one coating includes an expanded flame-retardant polymeric material having (a) at least one expandable polymer; (b) at least one expanding agent; (c) at least one flame-retardant inorganic filler, in an amount of 100 parts by weight of 250 parts by weight with respect to 100 parts by weight of the at least one expandable polymer. The process includes the following steps: (i) feeding the flame-retardant polymeric material to an extruding apparatus, therein melting and mixing it; (ii) passing the flame-retardant polymeric material obtained in step (i) through at least one static mixer; and (iii) depositing by extrusion the flame-retardant polymeric material obtained in step (ii) onto the at least one transmissive element conveyed to the extruding apparatus.

Abstract: A process for manufacturing a multipolar cable having at least one pair of cores, each core having at least one conductive element and at least one layer of electrical insulation in a position which is radially external to the at least one conductive element. The process includes the steps of: a) assembling the at least one pair of cores so as to form an assembled element having a plurality of interstitial zones between the cores, and b) depositing by co-extrusion an expandable polymeric material in a position which is radially external to the cores so as to fill the interstitial zone and to form a filling layer of substantially circular transverse cross section, and at least one containment layer of polymeric material in a position radially external to the filling layer. The multipolar cable obtained from the process.

Abstract: Process for manufacturing a cable comprising the following steps:(a) conveying at least one conductor to an extruder apparatus;(b) extruding an insulating coating layer radially external to said at least one conductor; (c) longitudinally folding a metal tape around said extruded insulating coating layer, said metal tape bearing at least one adhesive coating layer in a radially external position; (e) extruding at least one continuous coating layer comprising at least one polyamide or a copolymer thereof around and in contact with said folded metal tape; wherein the step (e) is carried out at a draw down ratio (DDR) not higher than 2.5, preferably of from 1.2 to 2.0.

Abstract: A multipolar cable for transmitting energy and/or signals, as well as an extrusion method and apparatus for the production thereof, is described. The multipolar cable has at least three transmissive elements and a sheath in which at least three longitudinal housings being intended to house respectively the at least three transmissive elements according to a predetermined configuration and being formed within respective substantially lobe-shaped longitudinal portions of the sheath. The multipolar cable allows the connection of the transmissive elements to one or more consumption points by means of at least one connector provided with at least three perforating elements.

Abstract: A process for manufacturing a cable includes the steps of conveying at least one conductor to an extruder apparatus; extruding an insulating coating layer radially external to the at least one conductor; longitudinally folding a metal tape around the extruded insulating coating layer, the metal tape bearing at least one adhesive coating layer in a radially external position; and extruding at least one continuous coating layer of at least one polyamide or a copolymer thereof around and in contact with the folded metal tape. The step of extruding the at least continuous coating layer is carried out at a draw down ratio not higher than 2.5, preferably, 1.2 to 2.0.

Abstract: An electric power cable contains a core and a jacket forming the exterior of the cable. The jacket is formed by extruding a first layer and a second layer over a plurality of concentric neutral elements, substantially encapsulating these elements. At least the first layer is an expanded polymeric material, by having its density reduced through the use of a foaming agent during extrusion. The second layer, which may also be expanded, is extruded around the first layer. The expanded polymeric material makes stripping the jacket easier, minimizes indentations in the cable's insulation layers, lightens the cable, and increases the cable's flexibility.

Abstract: The present invention relates to a manufacturing process of a multipolar cable comprising at least one pair of cores, each core comprising at least one conductive element and at least one layer of electrical insulation in a position which is radially external to said at least one conductive element. This process comprises the steps of: a) assembling said at least one pair of cores so as to form an assembled element having a plurality of interstitial zones between said cores, and b) depositing by co-extrusion an expandable polymeric material in a position which is radially external to said cores so as to fill said interstitial zone and to form a filling layer of substantially zone and to form a filling layer of substantially circular transverse cross section, and at least one containment layer of polymeric, and at least one containment layer of polymeric material in a position radially external to said filling layer. The present invention also relates to a multipolar cable obtained from said process.

Abstract: A cable comprises at least two cores stranded together, an expanded inner jacket layer, a substantially circular metallic armor partially contacting the inner jacket to form unfilled interstices outside the inner jacket, and a polymeric outer jacket. The expanded inner jacket substantially takes the shape of the periphery of the stranded cores, providing a non-circular cross section for the expanded inner jacket. A method of producing a cable comprises providing at least two cores, expanding a polymeric material, extruding the expanded polymeric material around the cores, and allowing the expanded polymeric material to collapse onto the cores. A substantially circular metallic armor is applied, resulting in a plurality of unfilled voids between the inner jacket and the metallic armor. An outer jacket is extruded on the metallic armor.

Abstract: A process for manufacturing a multipolar cable having at least one pair of cores, each core having at least one conductive element and at least one layer of electrical insulation in a position which is radially external to the at least one conductive element. The process includes the steps of: a) assembling said at least one pair of cores so as to form an assembled element having a plurality of interstitial zones between the cores, and b) depositing by co-extrusion an expandable polymeric material in a position which is radially external to the cores so as to fill the interstitial zone and to form a filling layer of substantially circular transverse cross section, and at least one containment layer of polymeric material in a position radially external to the filling layer. The multipolar cable obtained from the process.

Abstract: A process for manufacturing a cable includes the steps of conveying at least one conductor to an extruder apparatus; extruding an insulating coating layer radially external to the at least one conductor; longitudinally folding a metal tape around the extruded insulating coating layer, the metal tape bearing at least one adhesive coating layer in a radially external position; and extruding at least one continuous coating layer of at least one polyamide or a copolymer thereof around and in contact with the folded metal tape. The step of extruding the at least continuous coating layer is carried out at a draw down ratio not higher than 2.5, preferably, 1.2 to 2.0.

Abstract: An extrusion method and apparatus (11) for producing a cable (1, 101) including at least one core (7) comprising at least one transmissive element (2, 40), and at least one pair of coating layers (8, 9) arranged at a radially outer position with the respect of the core (7) are described. The method of the invention includes the simultaneous steps of depositing by co-extrusion at least one coating layer (8) of polymeric material and one coating layer (9) of expanded polymeric material and of maintaining a residual pressure not greater than the external pressure in a substantially annular interspace (21) defined between the coating layers. With respect to the methods of the prior art, the present invention allows to avoid the formation of bubbles at the interface between said at least one coating layer (8) of polymeric material and the coating layer (9) of expanded polymeric material, attaining an optimal adhesion between said layers (8, 9).

Abstract: A process for manufacturing a self-extinguishing cable including at least one transmissive element and at least one flame-retardant coating in a position radially external to the at least one transmissive element, wherein the at least one coating includes an expanded flame-retardant polymeric material having (a) at least one expandable polymer; (b) at least one expanding agent; (c) at least one flame-retardant inorganic filler, in an amount of 100 parts by weight of 250 parts by weight with respect to 100 parts by weight of the at least one expandable polymer.

Abstract: A multipolar cable for transmitting energy and/or signals, as well as an extrusion method and apparatus for the production thereof, is described. The multipolar cable has at least three transmissive elements and a sheath in which at least three longitudinal housings being intended to house respectively the at least three transmissive elements according to a predetermined configuration and being formed within respective substantially lobe-shaped longitudinal portions of the sheath. The multipolar cable allows the connection of the transmissive elements to one or more consumption points by means of at least one connector provided with at least three perforating elements.

Abstract: A cable comprises at least two cores stranded together, an expanded inner jacket layer, a substantially circular metallic armor partially contacting the inner jacket to form unfilled interstices outside the inner jacket, and a polymeric outer jacket. The expanded inner jacket substantially takes the shape of the periphery of the stranded cores, providing a non-circular cross section for the expanded inner jacket. A method of producing a cable comprises providing at least two cores, expanding a polymeric material, extruding the expanded polymeric material around the cores, and allowing the expanded polymeric material to collapse onto the cores. A substantially circular metallic armor is applied, resulting in a plurality of unfilled voids between the inner jacket and the metallic armor. An outer jacket is extruded on the metallic armor.