Thermal/Ultrasound Printer B/W – NSL P93W Mitsubishi (Japan)

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    超声打印机(ordirect thermal printing) is adigital printingprocess which produces a printed image by selectively heating coatedthermochromic paper, orthermal paper众所周知,当纸张通过热量时print head. The coating turnsblackin the areas where it is heated, producing an image. Two-colour direct thermal printers can print both black and an additional颜色(oftenred) by applyingheatat two differenttemperatures.rmal transfer printingis a very different method that uses a heat-sensitive ribbon instead of heat-sensitive paper, but uses similar thermal print heads.

    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 thermosensitive paper

    为了打印,温纸是英寸ted between the thermal head and the platen. The printer sends an电流to theheating elementsof the thermal head, which generate heat. The heat activates the thermo-sensitive coloring layer of the thermosensitive paper, which changes color where heated. Such a printing mechanism is known as athermal system或者direct system. The heating elements are usually arranged as a line of small closely spaced dots.

    The paper is impregnated with a solid-state mixture of a dye and a suitable matrix; a combination of afluoranLeuco染料octadecylphosphonic acidis an example. When the matrix is heated above its melting point, the dye reacts with the acid, shifts to its colored form, and the changed form is then conserved in metastable state when the matrix solidifies back quickly enough (a process known as热色素).

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