| 摘要 |
Process for controlling the capacitance value (C1) of a tubular sheath (1) formed by extrusion of an insulation compound (2) on an electrical cable (3) in an extrusion head (4), a foaming agent (FA) being introduced in the insulation compound (2) in such a way as to improve the capacitance value (C 1) of the tubular insulation sheath (1), this process being characterised in that: -a predetermined amount of foaming agent (200) is used in such a way a s to obtain a predetermined capacitance value (C1) for the tubular insulation sheath (1 ), and -in order to control precisely the capacitance value (C1) o f the tubular insulation sheath (1 ), a gas pressure (110) is applied on at least a portion of a face (100, 101 ) of the insulation compound (2) extrude d by the extrusion head (4), -the value of the gas pressure (110) is changed i n such a way as to control the capacitance value (C1) of the tubular insulatio n sheath (1).
|
