The thermal printer printhead consists of a row of heating elements, all of which have the same resistance. These components are densely packed, ranging from 200 dpi to 600 dpi. These components will quickly generate high temperatures when passing a certain current. When these components are encountered, the temperature rises in a very short period of time, and the dielectric coating reacts chemically to produce a color.
The thermal printer selectively heats the determined position of the thermal paper, thereby producing a corresponding pattern. Heating is provided by a small electronic heater on the printhead that is in contact with the heat sensitive material. The heaters are arranged in the form of square dots or strips that are logically controlled by the printer, and when driven, produce a pattern corresponding to the heating elements on the thermal paper. The same logic that controls the heating elements, while also controlling the paper feed, allows the graphic to be printed on the entire label or paper.
The most common thermal printer uses a fixed printhead with a heated dot matrix. The printhead shown has 320 square points, each at 0.25 mm x 0.25 mm. With this dot matrix, the printer can print dots anywhere on the thermal paper. This technology has been used on paper printers and label printers.
The paper feed speed when printing with a thermal printer is usually used as an evaluation index, that is, the speed is 13 mm/s. However, when the label format is optimized, some printers can double the speed. This thermal printer process is simpler and can be made into a portable battery-powered thermal label printer. Because thermal printers print in a flexible format, high image quality, fast speed and low cost, the printed barcode labels are not easy to store in environments above 60 ° C, or exposed to ultraviolet light (such as direct sunlight). Time storage. Therefore, thermal bar code labels are usually limited to indoor use.
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