| 摘要 |
A hair curler employing a heater element having a steeply sloped positive temperature coefficient (PTC) of resistance at temperatures above an anomaly temperature of ceramic or polymer material is disclosed. The heater combines a fast warmup time due to a low base resistivity with a slow cool down time due to the relatively massive heat sink which the heater forms. The sharp rise in resistance at temperatures above an anomaly temperature limits the current levels and hence heat generation at elevated temperatures thereby obviating the need for additional control means such as thermostats and the like.
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