The thermal printing technology was first used in fax machines. The basic principle is to convert the data received by the printer into a dot matrix signal to control the heating of the thermal unit, and to heat and develop the thermal coating on the thermal paper. Thermal printers have been widely used in POS terminal systems, banking systems, medical instruments and other fields.
Thermal printers can only use special thermal paper. The thermal paper is coated with a coating that reacts with heat when it is heated. It is similar to photographic film, but this coating will change color when heated. This characteristic of heat-sensitive coatings has led to thermal printing technology.