Firstly, look at the appearance of the paper. A good quality thermal cash register paper has uniform color development, good smoothness, high whiteness, and a little greenish color. If the paper is very white, the protective coating and thermal coating of the paper are unreasonable, and too much phosphor is added. If the paper is not smooth or looks uneven, then the paper coating is uneven, if the paper looks reflective The light is very strong and too much phosphor is added.
Secondly, bake with fire and heat the back of the paper with fire. If the color that appears on the paper is brown, it means that the heat-sensitive formula is not reasonable and the storage time may be relatively short. If the black part of the paper has small streaks or color blocks Uneven, indicating uneven coating
