Thermal paper can be used to make fax paper, cash register paper, recording paper, copy paper, etc. It is a kind of processed paper product. The production process is difficult and the technical requirements are relatively high. The manufacturing principle of thermal paper is to apply a layer of color-changing material on the base paper. There are dozens of chemicals used in this color-changing material. Among them, there are many dyeing materials used. %, Fillers account for about 50%, and adhesives account for about 10% or less.
Thermal paper is widely used, as a carrier of text and graphics, it can be used as fax paper; in medical and measurement systems, it can be used as recording materials, such as ECG drawings, thermal instrument recording paper, etc. It can be used for computer printing paper and joint printing paper; in commercial activities, it is used to make trademarks, POS codes, etc., which accounts for a large proportion of the amount of cash register paper.
In summary, the production principle of thermal paper is to coat fine powder on the base layer of ordinary paper, the composition is a leuco dye phenol or other acidic substance, separated by a film, the film melts under heat, the powder mix Color reaction: The color writing on the thermal paper is unstable and easy to fade, making the content of the document difficult to recognize.
Commonly used lottery tickets are thermal paper.