Principle and process of heat-resistant thermal paper

2023-01-31 Hits: 82 views

With the continuous updating of the demand for thermal paper, the functions of ordinary thermal paper can no longer meet the needs of today’s society. In order to achieve the high temperature resistance of thermal paper, many manufacturers have continuously upgraded and studied the production process and principle, and finally invented a heat-resistant thermal paper.

The heat-resistant thermal paper includes coating a precoat on the thermal base paper, adding hollow spherical resin into the precoat coating, coating a chromogenic layer on the precoat paper, and coating a protective layer on the chromogenic layer paper. The chromogenic layer includes colorless dyes, oxidants, sensitizers, lubricants, adhesives, filler calcined earth and anti-aging agents. The protective layer is acrylamide and epichlorohydrin. The new thermal paper process, with color development at 180 ° C and background color at 150 ° C, solves the problem that ordinary thermal paper cannot withstand high temperature.
The static sensitivity of heat-resistant thermal paper is its sensitivity to high temperature for a long time. Thermal sensitive paper based on synthetic materials has excellent resistance to paper fading and discoloration caused by adverse environment. In addition, some surface coating formulations can prevent image fading.
The specially formulated surface coating helps protect the thermal paper from rough treatment. The selection of thermal paper needs to weigh various factors. In addition to the tradeoff between high quality and low cost, other factors to be considered include higher printing speed and image quality degradation caused by high temperature resistance.
Different thermal printers will generate different heat, thus generating images on the thermal paper. Some thermal printers can adjust the image contrast by adjusting the optical density of the printed image. The image with higher optical density is darker, and the image with lower optical density is brighter. More heat is usually needed to produce images with higher optical density. Thermal paper that uses a large amount of heat for imaging is more resistant to other heat sources. The images produced by the combination of printers with higher thermal imaging and thermal paper that requires higher heat for imaging will not fade when exposed to high temperature.
Thermal media may be exposed to extreme conditions in the trading environment: the time of thermal media imaging and the environment between the delivery of documents to the recipient. For example, a parking ticket or ticket left on the windshield may be exposed to high temperature, strong sunlight, rain or snow for several hours or more.