1. PTC thermistors are also called positive temperature coefficient thermistors, and most of the hot air curtain machines now use this heating element. After the current passes through the element, the temperature rises, that is, the temperature of the heating element rises. When the temperature exceeds the Curie point temperature (240 degrees), the resistance increases, thereby limiting the increase in current. Therefore, the decrease in current causes the temperature of the element to decrease, and the resistance value decreases. It also increases the circuit current and increases the temperature of the components, which keeps the temperature in a specific range. Therefore, the hot air curtain made of this component has the characteristics of fast temperature rise, constant temperature and power saving, and can also play a role in electrical appliances. Overheating protection. (PTC is mainly based on barium titanate, supplemented by other polycrystalline ceramic materials.)

2. Some low-cost products add less barium titanate to the PTC, which can not achieve the effect of power saving and constant temperature.

3． In daily use, we can check whether the qualified PTC element is used by observing the current of the hot air curtain machine. After the hot air curtain is used for 2 hours, the current should decrease, and the pointer fluctuates gradually.

4． It should save about 50% of energy in the application in the drying box, and about 30% of energy in the application on the hot air curtain.