Electric heating – Inductive heating – Specific heating application
Patent
1993-11-29
1994-10-18
Leung, Philip H.
Electric heating
Inductive heating
Specific heating application
219647, 219657, 219651, 219674, H05B 610
Patent
active
053570855
ABSTRACT:
Induction heating is utilized to heat polymer matrix composite fiber strands containing electrically conductive fibers. This is accomplished with an apparatus having a helical induction coil and a matching helical guide tube situated adjacent to the induction coil. Composite fiber strands are drawn through the guide tube which is made of a non-electrically conductive, nonmagnetic material. Electrically conductive rollers, positioned next to the entrance and exit of the guide tube, form an electrical circuit with the electrically conductive fibers. This permits currents to be induced in the fibers when the coil is activated, thereby heating the fiber composites. The guide tube can be thermally insulated and flushed with an inert purge gas. Alternatively, the guide tube can be made of an electrically conductive or ferromagnetic material so that heat producing currents are induced in the guide tube, and the composite fiber strands are heated by conduction. In this case, the fibers need not be electrically conductive.
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Border, "the Heat's On For Quick Composite Repair," Machine Design, Mar. 7, 1991, pp. 71-74.
General Electric Company
Leung Philip H.
Scanlon Patrick R.
Webb II Paul R.
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