Heating rollers are widely used in papermaking, printing, copying, textile, rubber, plastic, chemical fiber and other industries such as preheating, drying, shaping, laminating, embossing, embossing, compounding and other production processes, mainly used for product Heating and thermal processing. The rolls are heated in some way and the rolls turn to heat the product running on them. According to different heating methods, heating rollers can be divided into two categories: fluid heating and electric heating. Among them, fluid heating mainly includes heat transfer oil, water, and steam; electric heating is mainly divided into two types: direct heating of electric heating tube and electromagnetic induction heating.