ELECTRIC CABLE COMPRISING A FOAMED POLYOLEFINE INSULATION AND MANUFACTURING PROCESS THEREOF

• Main Authors: CASIRAGHI FLAVIO, GRASSELLI GIANBATTISTA, PONS JEAN LOUIS, BAREGGI ALBERTO, FRIGERIO MARCO, CRISCI VINCENZO
• Format: Patent
• Language: English
• Published: 31.01.2013
• Subjects: BASIC ELECTRIC ELEMENTS; CABLES; CONDUCTORS; ELECTRICITY; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES

A PROCESS FOR MANUFACTURING AN ELECTRIC CABLE (10) COMPRISING AT LEAST ONE CORE COMPRISING A CONDUCTOR (1) AND AN INSULATING COATING (2)SURROUNDING THE CONDUCTOR (1) IS DESCRIBED, THE PROCESS COMPRISING THE STEPS OF: PROVIDING A POLYOLEFIN MATERIAL, A SILANE-BASED CROSS-LINKING SYSTEM AND A FOAMING SYSTEM COMPRISING AT LEAST ONE EXOTHERMIC FOAMING AGENT IN AN AMOUNT OF 0.1% TO 0.5% BY WEIGHT WITH RESPECT TO THE TOTAL WEIGHT OF THE POLYOLEFIN MATERIAL; FORMING A BLEND WITH THE POLYOLEFIN MATERIAL, THE SILANE-BASED CROSS-LINKING SYSTEM AND THE FOAMING SYSTEM; AND EXTRUDING THE BLEND ON THE CONDUCTOR (1) TO FORM THE INSULATING COATING (2). AN ELECTRIC CABLE (10) IS ALSO DESCRIBED COMPRISING AT LEAST ONE CORE CONSISTING OF A CONDUCTOR (1) AND AN INSULATING COATING (2) SURROUNDING SAID CONDUCTOR (1) AND IN CONTACT THEREWITH, THE INSULATING COATING (2) CONSISTING ESSENTIALLY OF A LAYER OF EXPANDED, SILANE-CROSSLINKED POLYOLEFIN MATERIAL HAVING AN EXPANSION DEGREE OF FROM 3% TO 40%.