The key to thermal printing technology lies in the heating element. There is a row of tiny semiconductor elements on the thermal printer core. These elements are arranged very densely, ranging from 200DPI to 600DPI. These elements will quickly generate high temperatures when passing a certain current. When the coating of thermal paper encounters these components, the temperature will rise in a very short time, and the coating on the thermal paper will undergo a chemical reaction to show color.
After the thermal printer receives the print data, it converts the print data into bitmap data, and then controls the heating element on the printer core to pass current according to the dots of the bitmap data, so that the print data becomes the print content on the printing paper.