Calcined kaolin clay is employed in the base coating of thermal paper. Thermal paper is a specialized type of coated paper that captures images directly through thermal action. It finds extensive applications in fax machines, communication devices, measurement systems, thermal instruments, computer networking terminal printing, trademarks, signatures, and more. With the rapid advancements in information technology, the widespread adoption of ticket printer technology and bar code technology has propelled the rapid growth of thermal paper usage in logistics, supermarkets, ticket printing, and various other fields.

According to reports, China's production of thermal paper in 2020 reached 530,000 tons, demonstrating a growth rate exceeding 10%. The coating of thermal paper primarily consists of a top coat and a bottom coat. The top coat serves as the functional layer for the thermal color development, while the bottom coat enhances paper smoothness and provides a thermal insulation layer to facilitate effective heat transfer to the surface color development layer. Plastic pigments serve as base coatings for thermal paper.

The unique hollow structure of the coating imparts porosity and excellent heat insulation properties. However, due to its high cost, reaching around 25,000 yuan per ton, the price of plastic pigments significantly contributes to the overall paint cost. Coal measures kaolin stands as a valuable resource in China, boasting the world's leading reserves of 1.67 billion tons. With its large deposit scale, favorable occurrence conditions, convenient mining, high quality, and exceptional performance, coal measures kaolin is typically associated with bauxite and coal seams, exhibiting high carbon content and presenting colors such as black, gray, or brown. The raw ore is commonly used directly in industries like ceramics, fire resistance, and rubber for applications with stringent color requirements.

In the realm of business, calcined kaolin represents a deep processing product derived from coal measures kaolin through ultra-fine grinding and high-temperature calcination. It features characteristics such as high whiteness, strong activity, high porosity, light-scattering performance, and good thermal stability. Its application in low-weight coated paper and coated box board serves to enhance paper whiteness and opacity while improving printability.