In general, enameled wire by bending or after elongation, film stress is produced. In this state, when the enameled wire and moisture, water, solvents, and chemicals, such as after contact, will appear fine cracks, resulting in a pinhole and peeling of the paint film. This phenomenon is called wet crack, and this phenomenon is found in most synthetic resin enameled wire.
However, the stresses induced by heat treatment can eliminate the paint film, and prevent cracks, or cooked results should call this heat treatment effect, the heating temperature and time are proportional.
In order to improve the stability of the enameled wire, and give full play to the characteristics of the coil shape before and after dipping treatment, heat treatment is recommended for the method. Heat treated condition varies according to the size and shape of the coil, generally is 100 ~ 120 ℃, 10 ~ 30 min apparatus and instruments for 100 ~ 120 ℃, 1 ~ 2 h, but high temperature resistant enameled wire (such as polyimide) is 150 ℃.
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