Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1988-04-18
1990-07-24
Paschall, M. H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219497, 219501, 219505, 219535, 219544, 285 41, 1562742, H05B 102
Patent
active
049437062
ABSTRACT:
An apparatus and method for attaining fusion temperature at substantially the same time throughout an interface between thermoplastic articles by the controlled application of heat. The method includes providing a sensed temperature signal corresponding with the temperature at the interface, generating a desired temperature signal (such as an analog ramp signal which increases linearly with time) corresponding with a predetermined heat application rate which causes the temperature at substantially all portions of the interface to rise substantially uniformly, providing a heat control signal corresponding with any difference between said signals, and applying heat to the interface at a rate determined by the heat control signal to achieve fusion temperature throughout the interface at the same time. The apparatus includes a heater coil to apply heat to the interface, a sensor to provide the sensed temperature signal, a generator to provide the desired temperature signal, and a differential amplifier to provide the heat control signal. Fault detection circuits stop the process if a heater fault, a temperature sensor fault, or a power supply fault is detected. Testing circuits are included to test the apparatus for proper operation before commencing fusion.
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Lyall Lucian H.
Renau Karol Z.
Paschall M. H.
R. W. Lyall & Company, Inc.
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