What is the thermal paper?

Thermal paper is also called thermal fax paper, thermal recording paper, thermal copy paper, and thermal copy paper in Taiwan. Thermal paper is a kind of processed paper, and its manufacturing principle is to coat a layer of “heat sensitive paint” (heat sensitive color change layer) on high-quality base paper.

Although there are more than a dozen chemicals used in this color change layer, there are at least the following compounds: leuco dyes, the dyes are of a wide variety, the most commonly used are fluorescent compounds; the color developing agent accounts for less than 20%, and the commonly used ones are double Phenol, p-hydroxybenzoic acid; sensitizer accounts for less than 10%.

It contains benzenesulfonic acid amide compounds; fillers account for less than 50%, commonly used calcium carbonate (fine particles); adhesives account for less than 10%, such as polyvinyl acetate; stabilizers, such as dibenzoyl terephthalate; Lubricants, etc. Therefore, the process is difficult and the technical requirements are high.


If the coating of the thermal paper is not uniform, it will cause the color to be dark in some places and light in some places during printing, and the print quality will be significantly reduced.

If the chemical formula of the thermal coating is not reasonable, the storage time of the printing paper will become very short. Good printing paper can be stored for 5 years after printing (under normal temperature and avoiding direct sunlight), and now it can be stored 10 Year-old long-lasting thermal paper, but if the formulation of the thermal coating is unreasonable, it may only be stored for a few months.


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