Thermal / Ultrasound Printer B/W – NSL P95DW Mitsubishi (Japan)

Thermal printer(ordirect thermal printing) is adigital printingprocess which produces a printed image by selectively heating coatedthermochromic paper, orthermal paperas it is commonly known, when the paper passes over the thermalprint head. The coating turnsblackin the areas where it is heated, producing an image. Two-colour direct thermal printers can print both black and an additionalcolour(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inserted between the thermal head and the platen. The printer sends anelectric currentto 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 systemordirect system. The heating elements are usually arranged as a line of small closely spaced dots.

这篇论文is impregnated with a solid-state mixture of a dye and a suitable matrix; a combination of afluoranleuco dyeand anoctadecylphosphonic 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 asthermochromism).