What is a thermal printer

The working principle of a thermal printer is that a semiconductor heating element is installed on the print head. After the print head heats and contacts the thermal printing paper, the required pattern can be printed. The principle is similar to that of a thermal fax machine. The image is generated by heating, causing a chemical reaction in the film. This thermal printer chemical reaction is carried out at a certain temperature. High temperature will accelerate this chemical reaction. When the temperature is lower than 60°C, it takes a long time, even several years, for the paper to become dark; and when the temperature is 200°C, this reaction will be completed in a few microseconds.