What is a thermal printer
Thermal printers can be divided into Thermal Line Dot System and Thermal Serial Dot System according to the arrangement of their thermal elements. Thermal Line Dot System is an early product, mainly used in some occasions where the printing speed is not high, and domestic authors have already used it in their products. Line thermal is a technology in the 1990s, and its printing speed is much faster than column thermal, with the fastest speed reaching 300mm/sec. To achieve high-speed thermal printing, in addition to selecting a high-speed thermal print head, there must also be a corresponding control board to cooperate with it.
Principle of thermal printer
The principle of thermal printers is to coat a light-colored material (usually paper) with a transparent film, and heat the film for a period of time to turn into a dark color (usually black, but also blue). The image is created by heating, which produces a chemical reaction in the film. This chemical reaction is carried out at a certain temperature. High temperatures accelerate this chemical reaction. When the temperature is lower than 60°C, it takes a considerable time, even several years, for the film to become dark; when the temperature is 200°C, this reaction is completed within a few microseconds. The thermal printer selectively heats the thermal paper at certain locations, thereby producing corresponding graphics. Heating is provided by a small electronic heater on the printhead that is in contact with the heat-sensitive material. The heaters are logically controlled by the printer in the form of square dots or strips. When driven, a graphic corresponding to the heating element is generated on the thermal paper. The same logic that controls the heating element also controls the paper feed, allowing graphics to be printed on the entire label or paper.
The role of thermal printer
Thermal printing technology was first used in fax machines. Its basic principle is to convert the data received by the printer into dot matrix signals to control the heating of the thermal unit, and to heat and develop the thermal coating on the thermal paper. Thermal printers have been widely used in POS terminal systems, banking systems, medical instruments and other fields. Thermal printers can only use special thermal paper. The thermal paper is coated with a coating that will change color due to chemical reaction when heated, similar to photosensitive film, but this coating will change color when heated. This characteristic of thermal coatings has led to the emergence of thermal printing technology.
With the acceleration of electronic informatization, the demand for barcode printers in commerce, industry, finance, medical care, modern logistics and other industries has grown rapidly, which has brought the thermal receipt printer industry into a sustained high-speed growth period.
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