Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Reexamination Certificate
2007-11-27
2007-11-27
Kuhns, Allan R. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
C264S040300, C264S046900, C264S101000, C264S102000
Reexamination Certificate
active
10478535
ABSTRACT:
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 (C1) 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 as to obtain a predetermined capacitance value (C1) for the tubular insulation sheath (1), andin order to control precisely the capacitance value (C1) of 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) extruded by the extrusion head is (4),the value of the gas pressure (110) is changed in such a way as to control the capacitance value (C1) of the tubular insulation sheath (1).
REFERENCES:
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patent: 4278624 (1981-07-01), Kornylak
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patent: 6613983 (2003-09-01), Shukushima et al.
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patent: A 5-20944 (1993-01-01), None
Bonvin Pierre-Yves
Evangelisti Giancarlo
Gerhard Philippe
Kuhns Allan R.
Maillefer SA
Oliff & Berridg,e PLC
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