Android POS Terminal is a kind of special coating paper, whose appearance is similar to ordinary white paper. The surface of thermosensitive paper is smooth, which is based on ordinary paper. A thermosensitive chromogenic layer is coated on the surface of ordinary paper. The chromogenic layer is composed of adhesive, chromogenic agent, colorless dye (Android Thermal Printer), which is not separated by microcapsules. The chemical reaction is in a "latent" state. When the heat sensitive paper encounters a heated print head, the color developing agent at the printing place of the print head reacts with the colorless dye to change color, forming a picture and text.
When the thermosensitive paper is placed above 70 ℃, the color of the thermosensitive coating begins to change. The reason of its discoloration should be discussed from its composition. There are two kinds of thermosensitive components in thermosensitive paper coating: one is colorless dye or crypto dye; the other is chromogenic agent. This kind of heat sensitive paper is also known as two group differentiation type heat sensitive recording paper.
The main colorless dyes are: Bluetooth Printer Android, fluorane, blmb or spiropyran. They are mainly used as chromogenic agents: p-hydroxybenzoic acid and its esters (phbB, Bluetooth Printer China), salicylic acid, 2,4-dihydroxybenzoic acid or aromatic sulfone, etc.
When the thermal paper is heated, the colorless dye reacts with the chromogenic agent to produce the color, so when the thermal paper is used to receive the signal on the fax machine for printing or directly printed with the thermal printer, the picture and text will be displayed. There are many kinds of colorless dyes, so the color of the handwriting is different, including blue, purplish red, black, etc.
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