In recent years, the video industry has continued to digitize, and the rapid development of personalized services such as camera phones, video kiosks, and digital ID photos has brought unlimited business opportunities for TA-based thermal printing. The Fuji CX-400 and the newly launched CX-550 and NC-400D in 2004 have been popular with families and small and medium-sized photo studios and photo studios since they were launched in China. Fujifilm predicts in 2003 that after 1 to 2 years, the photo printer market adopting the TA method will expand from 200,000 units/year to 500,000 units/year, ensuring that it has 30 thermal image photo printers such as sublimation printers. % market share. Therefore, the amount of dedicated photo paper for TA printers will naturally increase accordingly. At present, the system is only applied to the general photography field. After continuous technological innovation, it is likely to expand into the printing and medical fields in the future.

3, the development of thermal dyes

1 Initially, the discovery of black fluorinated thermal dyes made a significant contribution to the development of thermal recording paper. The development of each company is as follows:

In the 1970s, most of the thermal paper used dye-based colorless or light-colored precursors, and colored reagents produced colored dyes. A colorless or pale dye, which is reduced to a denatured dye with a colored dye, and has an internal lipid ring in its molecule. When heated, it can be combined with an organic or inorganic developer to obtain the electron acceptor phenolic compound from the leuco dye. At this point, the inner alicyclic ring opens and becomes a colored dye.

A wide variety of dyes are used, mainly decane dyes, diphenyl dyes, triphenylmethane dyes, oxazine dyes and the like.

After the 1980s, there were three outstanding performances: the development of chemical heat-sensitive recording materials, people's high density, high thermal, anti-plasticity, oil resistance, anti-diffusion, light resistance, heat stability and resistance We have done a lot of research work on the preservation of wet and anti-oxidation; diazonium salt also occupies an important position in heat-sensitive recording materials; physical heat-sensitive information recording materials have no chemical reaction, and many heat-transfer machines will contain various colored dyes. Coatings combined with fatty acid amides, polyesters, etc., are sublimated and transferred to another paper base.

Author: Wang Guihua