Digital printing thermal transfer

Thermal transfer systems have been developed to obtain prints from pictures that have been generated electronically, for example, from a color video camera or digital camera. Thermal transfer works by transmitting heat through the dye-donor element from the back-side to the dye-donor layer. 

Heat. As mentioned above most molecules lose energy from the excited state as heat. The most efficient molecules for converting electromagnetic radiation into heat are those that absorb in the near-IR region, i.e., infrared absorbers (IRAs). There has been much interest in IRAs because of their use in laser thermal transfer, optical data storage [the older write-once read-many (WORM) and the newer compact disc recordable (CD-R) and digital versatile disc recordable (DVD-R) systems], computer-to-plate printing, and as solar screens for car windscreens and windows. 

Simple methines, often called styryl dyes, were once important as yellow disperse dyes bnt are now only nsed to prodnce bright bine and tnrqnoise dyes. Examples are the mono-methine (2.21), the dimethine (2.22) and the azamethine (2.23). Indophenols (2.24), another class of azamethines, have been nsed as bright bines for transfer printing onto polyester and in digital imaging by dye diffnsion thermal trans-... 

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