Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1989-09-08
1993-05-04
Paschall, Mark H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219 1075, 219 10491, 1562724, B29C 1902, H05B 610
Patent
active
052084434
ABSTRACT:
This invention relates to heat-recoverable devices that are self-heating and auto-regulating. The heat-recoverable articles of this invention comprise the combination of a heat-recoverable material and lossy heating particles, such as ferromanetic or ferrimagnetic particles, which produce heat when subjected to an alternating magnetic field and have a Curie temperature at or above the recovery temperature of the material and preferably below the decomposition temperature of the material. The particles can be in an electrically non-conductive layer, on or in thermal contact with the heat-recoverable material or can be dispersed in the heat-recoverable material. The system of this invention includes the heat-recoverable device or article, an induction coil for producing the magnetic field and an alternating current power supply for the induction coil. Preferably the power supply is high frequency and constant current, which produces efficient heating and preferred auto-regulating properties. Preferred particles are small particle size ferrites.
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Metcal Inc.
Paschall Mark H.
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