The working principle of AIXW thermal printer
The working principle of AIXW thermal printer
The working principle of AIXW thermal printer is that a semiconductor heating element is installed on the print head, and the print head heats and contacts the thermal printing paper to print the desired pattern. Its principle is similar to that of a thermal fax machine. Images are generated by heating and generating chemical reactions within the film. The chemical reaction of this thermal printer occurs at a certain temperature. High temperature will accelerate this chemical reaction. When the temperature is below 60 ℃, it takes a considerable amount of time, even several years, for the paper to turn dark; And when the temperature is 200 ℃, this reaction will be completed within a few microseconds.
Thermal paper is a special type of coated processing paper that looks similar to regular white paper. Thermal paper has a smooth surface and is made of ordinary paper as the paper base. It is coated with a thermal sensitive coloring layer, which is applied to one side of the surface of the ordinary paper. The coloring layer is composed of adhesive, color developer, and colorless dye (or hidden dye), and is not separated by microcapsules. The chemical reaction is in a "latent" state. When thermal paper encounters a heated print head, the color developer and colorless dye at the printed area of the print head undergo a chemical reaction and change color, forming graphics and text.
When the thermal paper is placed in an environment above 70 ℃, the thermal coating begins to change color. The reason for its discoloration also depends on its composition. The thermal sensitive components in the coating of thermal paper are mainly two types: one is colorless dye or latent dye; Another type is colorants. This type of thermal paper is also known as two-component differentiation type thermal recording paper.
The main substances commonly used as colorless dyes are crystal violet lactone (CVL) in the triphenylalkylphthalein system, fluoranthene system, colorless benzoyl methylene blue (BLMB), or spiropyran system. The main substances commonly used as colorants are para hydroxybenzoic acid and its esters (PHB, PHB), salicylic acid, 2,4-dihydroxybenzoic acid, or aromatic sulfones.
Thermal paper undergoes a chemical reaction between colorless dye and color developer when exposed to heat, producing color. Therefore, when using thermal paper to receive signals for printing on a fax machine or directly printing with a thermal printer, graphics and text are displayed. Due to the variety of colorless dyes used, the color of the displayed handwriting varies, including blue, magenta, black, and so on.
