A thermal printer is equipped with a semiconductor heating element on the print head. The print head prints the required pattern after heating and contacting the thermal printing paper. It is similar to a thermal fax machine. The image is generated by heating and generating a chemical reaction in the film.
Compared with dot printing, thermal printing has the advantage of being fast, because the print head with the same width design as the media to be printed, the paper of the thermal printer can reach the speed of second.
However, thermal printing also has disadvantages. Because thermal paper is greatly affected by ambient temperature, the printed bills have a shorter storage time. The printed bills will fade and blur in about three months and will be difficult to identify.