The principle of a thermal printer is to cover a transparent film on a pale material (usually paper), heat the film for a period of time and turn it dark (usually black and blue). The image is generated by heating and producing a chemical reaction in the membrane. This chemical reaction is carried out at a certain temperature. High temperatures speed up this chemical reaction.
When the temperature is below 60 ℃, the membrane takes a considerable amount of time, or even several years, to become dark, and when the temperature is 200 ℃, the reaction is completed in a matter of microseconds. The thermal printer is selectively heated at the determined position of the thermal paper, resulting in a corresponding graphic. Heating is provided by a small electronic heater on the printhead that is in contact with the thermal material. The form of the heater actuators point or bar is logically controlled by the printer, and when driven, a graph corresponding to the heating element is generated on the thermal paper.
Controls the same logic circuit of the heating element, while also controlling the feed, so that the graphic can be printed on the entire label or paper. The most common thermal printer uses a fixed printhead with a heated dot, and the printhead has 320 square points, each of which is 0.25mmx0.25mm. With this dot matrix, the printer can place the print point anywhere on the thermal paper. This technique has been used on paper printers and label printers.
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