Thermal printer principle

- Nov 20, 2018-

Thermal printers use thermal printing technology, which uses special thermal paper to cause chemical reaction and discoloration at high temperatures to achieve printing results. Compared with stylus printing, thermal printing technology has many features such as low noise, fast speed and clear printing. It has been widely used in banking systems, POS terminal systems, medical devices and other aspects.


Thermal paper is a paper specially used in thermal printing. It consists of a layer of plain paper and a layer of heat-sensitive coating (mainly containing leuco fuel and developer). This paper does not occur at normal temperature. The chemical reaction is in a "latent" state, and at a high temperature, the leuco fuel in the heat-sensitive coating chemically reacts with the developer to produce a certain color, and the higher the temperature, the faster the color changes. Therefore, in contact with the print head, the desired color change position can be selected to print the desired content.


For a thermal printer, the literal can be understood as an instrument that prints under the heated state using a chemical reaction of sensitive elements, which describes the printing principle of the thermal printer. A semiconductor heating element is mounted on the thermal head of the thermal printer for heating the thermal paper; a print head is used to select a desired printing position or image; and thermal paper is used to accept the printing position and discolor at a high temperature To achieve the purpose of printing.


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