ELECTRIC CABLE, COMPRISING INSULATION FROM FOAMED POLYOLEFINE, AND METHOD OF ITS MANUFACTURING Russian patent published in 2009 - IPC H01B7/02 

FIELD: power engineering.

SUBSTANCE: method is described for manufacturing of electric cable (10), comprising at least one core, which includes conductor (1) and insulating coating (2), which surrounds conductor, at the same time method includes the following stages: supply of polyolefine material, cross-linking system on silane basis and foam generation system, comprising at least one exothermic foaming agent in amount of at least 0.1% - 0.5% (wt) per total mass of polyolefine material; production of polyolefine material mixture, cross-linking system on silane basis and foam generation system; and extrusion of mixture to conductor (1) to make insulating coating (2). Also electric (10) is described, which comprises at least one core, which consists of conductor (1) and insulating coating (2), which surrounds mentioned conductor (1) and is in contact with it, at the same time insulating coat (2) mainly consists of a layer of foamed silane-linked polyolefine material, characterised with extent of foaming in the range from 3% to 40%.

EFFECT: increased flexibility of cable, improved mechanical characteristics and electric properties.

55 cl, 6 tbl, 6 ex