Electric heating – Metal heating – Of cylinders
Patent
1991-04-26
1993-07-27
Reynolds, Bruce A.
Electric heating
Metal heating
Of cylinders
219 1043, 219 10491, 219 1053, 219 1073, 219 1075, 219 1079, 219 95, 156 86, 1562722, 1562724, 156143, H05B 600
Patent
active
052312674
ABSTRACT:
A method of producing a heat recoverable plastic article such as a tube by deforming the article from a heat-stable configuration to a heat-unstable configuration. The heat-unstable configuration will return to the heat-stable configuration when the article is heated to above the heat recovery temperature. The article is heated such that the article is at a temperature no lower than the heat recovery temperature during the deforming step by lossy particles dispersed in the article or in a tool used in the deforming step. The lossy particles allow auto-regulated heating of the article since the particles cannot be heated beyond their Curie transition temperature when subjected to an alternating magnetic field. These particles are preferably ferrites. Alternatively, the tool can include a braided mesh tubing of a ferromagnetic alloy wire. The article is cooled in the heat-unstable configuration to a temperature below the heat recovery temperature while preventing the article from returning to the heat-stable configuration. The tool can be a mandrel, expandable tube or caterpillar.
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Hoang Tu
Metcal Inc.
Reynolds Bruce A.
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