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Thermal paper is also known as thermal fax paper, thermal recording paper, thermal copy paper, in Taiwan is called thermal copy paper. Thermal paper is a processed paper, its manufacturing principle is in the quality of the base paper coated with a layer of "thermal coating" (thermal color layer). Although there are dozens of chemicals used in this discoloration layer, there are at least the following compounds: leuco dyes, the variety of which is widely used, the most commonly used fluorescent compounds; chromogenic agents about 20% or less, commonly used in double Phenol, p-hydroxybenzoic acid; sensitizer about 10% or less, which contains benzenesulfonic acid amide compounds; filler about 50% or less, commonly used calcium carbonate (particles); adhesive about 10% Such as polyvinyl acetate; stabilizers such as dibenzoyl phthalate; lubricants and the like. So the process is difficult, high technical requirements.

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