The production principle of heat-sensitive paper is to coat the particle powder on the ordinary paper base, which is composed of colorless dyes, phenols or other acidic substances, separated by the film. Under the heating condition, the film melts, and the powder mixes to form a color reaction. The color developed on the heat-sensitive paper is unstable and easy to fade, resulting in the illegibility of the content of the document. Next, let's look at how to identify the quality of thermal paper.

1. Appearance: If the paper is very white, it means that the protective coating and thermal coating of the paper are unreasonable, and too much phosphor is added. The better paper should be slightly green. The paper is not smooth or looks uneven, which means that the paper coating is uneven. If the paper looks very reflective, it also adds too much phosphor, and the quality is not good.

2. Fire baking: The method of fire baking is also very simple. Use a lighter to heat the back of the paper. If the color on the paper is brown after heating, it means that the heat sensitive formula is not reasonable and the storage time may be shorter. If the black part of the paper has small stripes or uneven color blocks, it means that the coating is uneven. The paper with good quality should be dark green (with a little green) after heating, and the color block should be uniform, and the color will gradually fade from the center to the surrounding.

3. Comparison and identification of sunlight exposure: smear the printed paper with a fluorescent pen and put it in the sun (this can speed up the reaction of the thermal sensitive coating to light). Which kind of paper darkens quickly indicates the shorter the storage time.

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