Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling heat transfer with molding material
Patent
1981-04-29
1982-11-16
Anderson, Philip E.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling heat transfer with molding material
264 459, 264174, 425113, 425143, 425817C, B29D 2700, B29F 310
Patent
active
043594360
ABSTRACT:
A conductive element (22) is preheated by a preheat power supply (34) to an initial temperature which is a function of line speed. The preheated conductive element (22) is advanced through an extruder (32) whereat a cellular insulation layer (24) and a solid plastic insulation layer (26) are extruded thereabout to form an insulated conductor (20). The insulated conductor (20) is advanced through an air gap (38) whereat the cellular insulation layer 24 expands about the conductive element (22). The insulated conductor (20) is then quenched at a point to stop the expansion of the cellular insulation layer by passing the insulated conductor into a cooling bath (40).
A capacitance monitor (50) measures the coaxial capacitance of the insulated conductor (20) and develops an error signal. Thereafter, a microcomputer (54) facilitates the adjustment of the temperature of conductive element (22) as a function of line speed and the error signal and the adjustment of the point of quenching as a function of the error signal. The adjustment of the temperature and the point of quenching facilitates control of the expansion of the cellular insulation layer (24).
REFERENCES:
patent: 2765441 (1956-10-01), Gambrill
patent: 2908861 (1959-10-01), Gambrill
patent: 3748577 (1973-07-01), Jones, Jr.
patent: 3877653 (1975-04-01), Foltyn et al.
patent: 3914357 (1975-10-01), Cereijo et al.
patent: 4017228 (1977-04-01), Cereijo et al.
patent: 4177097 (1979-12-01), Hudson, Jr. et al.
Henderson Joseph G.
Markham Alan S.
Neumyer Richard D.
Anderson Philip E.
Hoofnagle J. B.
Western Electric Company Inc.
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