Thermal paper is a kind of special coating processing paper which can obtain images directly through thermal action. It is widely used in fax machine, communication, measuring system, thermal instrument, computer networking terminal printing, trademark, signature and so on. With the rapid development of information technology, ticket printer technology and bar code technology have been widely used, and the use of thermal paper in logistics, supermarkets, ticket printing and other fields has grown rapidly. According to the report, China's thermal paper production in 2020 reached 530,000 t, a growth rate of more than 10%. The coating of thermal paper mainly includes a top coat and a bottom coat. The top coat is the hair color functional layer of thermal paper, and the bottom coat is to improve the smoothness of the paper and provide a thermal insulation layer to transfer heat to the surface coat hair color layer more effectively. Plastic pigments are thermal paper base coatings.
The special hollow structure makes the coating porous and has good heat insulation function; But the price is expensive, the price per ton is as high as about 25,000 yuan, so the cost of paint is very high. Coal measures kaolin is a valuable resource in China. China's coal measure kaolin reserves rank first in the world, reaching 1.67 billion tons, and it has the characteristics of large deposit scale, good occurrence conditions, convenient mining, high quality and excellent performance. However, coal measures kaolin is usually associated with bauxite and coal seams, with high carbon content, mostly black, gray or brown, and the raw ore is mostly used in ceramics, fire resistance, rubber and other industries after direct grinding, suitable for workers with high color requirements.
The field of business. Calcined kaolin is a deep processing product of coal measures kaolin after ultra-fine grinding and high temperature calcination. It has the characteristics of high whiteness, strong activity, high porosity, light scattering performance and good thermal stability, etc. It is used in low-weight coated paper and coated box board, which can improve the whiteness and opacity of paper and improve printability.