The principle of thermal printer is that a layer of hyaloid membrane is added to the light material (usually paper) to heat the film for a period of time.

It turns dark (usually black, but also blue). The image is heated, biochemical response in the film

generated. This chemical reaction is carried out at a certain temperature. High temperature will accelerate this chemical reaction. When the temperature

when it is lower than 60 ℃, the film needs to go through quite long, it takes even several years to become dark; And when the temperature is

at 200℃, this reflection will be completed within a few microseconds.

  The thermal printer selectively heats at a certain position of thermosensitive paper, thus generating corresponding graphics. Heating

yes by A small electronic heater provided on the print head in contact with the heat-sensitive material. The heater is arranged into square points or bars.

The form is logically controlled by the printer. When driven, one is generated on thermosensitive paper. Corresponding to heating elements

graphics. The same logic circuit that controls the heating element, at the same time, it also controls the paper feed, so it can on the entire label or paper

A graphic is printed on it. The most common thermal printer uses a fixed print head with heating dot matrix., the print head is equipped

320 square points, each point is0.25mm × 0.25mm. With this dot matrix, the printer can print point in heat

any position of the sensitive paper. This this technology has been used in paper printers and label printers.