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| Channel Coils: When power densities are low and heating cycles not extremely short, parts can be processed by use of a turntable or conveyor in a continuous or indexing mode. The coil must be designed to permit easy entry and exit of the part. The simplest channel coil used in these situations is a modification of the hairpin inductor. With the indexing technique, in which the part is at rest in the coil during the heating cycle, the ends of the hairpin can be decoupled to prevent overheating of the ends. These raised portions or bridges also facilitate passage of the part through the coil. When a wide heating zone is to be produced on the part, coupling over a greater area can be accomplished through the addition of a liner to the coil turn, or more ampere turns can also be produced with a multi-turn channel inductor. Channel-coil liners may also be configured to produce specialized heating patterns where greater heat densities are required in specific areas. |
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