The original PTC is used as the heating source, no open flame, automatic temperature control, aluminum profiles with a purity of up to 99.7% are used, and the product is made of one-piece stretching technology, and the product has a uniform wall thickness. It has the advantages of automatic constant temperature, safety, dry burning prevention, power saving and energy saving. It is widely used in home appliances such as medical bag sealing machine, hair straightener, hair curler, electric splint, electric kettle, milk warmer, sol gun, hand dryer, wet tissue machine, air-conditioning heater, etc.