The thermal paper is impregnated with a solid-state mixture of

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The thermal paper is impregnated with a solid-state mixture of a dye and a suitable matrix.

Thermal paper is paper that is impregnated with a chemical that changes color when exposed to heat. It is used in thermal printers and particularly in cheap, lightweight devices such as adding machines, cash registers, and credit card terminals.

A thermal printer comprises these key components:

-> Thermal head generates heat; prints on paper
-> Platen a rubber roller that feeds paper
-> Spring applies pressure to the thermal head, causing it to contact the thermo-sensitive paper
-> Controller boards for controlling the mechanism

In order to print, one inserts thermo-sensitive paper between the thermal head and the platen. The printer sends an electrical current to the heating resistor of the thermal head, which in turn generates heat in a prescribed pattern. The heat activates the thermo-sensitive coloring layer of the thermo-sensitive paper, which manifests a pattern of color change in response. Such a printing mechanism is known as a thermal system or direct system.

The paper is impregnated with a solid-state mixture of a dye and...

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