First of all, Xiaobian first introduces you to the thermal paper structure used in the POS cash register:
The thermal cash register paper is generally divided into three layers, the bottom layer is a paper base, the second layer is a heat-sensitive coating, and the third layer is a heat-sensitive coating or a protective layer whose protective layer mainly affects its quality. If the coating of the thermal cash register paper is uneven, the color of the printed printing will be different when printed. If the chemical formula of the coating of the thermal cash register paper is unreasonable, the storage time of the thermal cash register paper will be shortened after printing. The protective layer is also critical for the storage time after printing. It absorbs some of the light that causes the chemical reaction of the heat-sensitive coating to slow down the deterioration of the thermal cash register paper.
(1) Carefully check the appearance of the thermal paper. The good quality of the cash register thermal printer paper has uniform color, good smoothness, high whiteness and a little greenish color. If the paper is very white, then the protective coating and heat-sensitive coating of the paper are unreasonable. It may be that too much phosphor is added; if the paper finish is not high or looks uneven, the paper coating is uneven; if the paper looks The reflected light is very strong, and too much phosphor is added.
(2) Use the fire to heat the back side of the cash register thermal paper. If the color appearing on the paper is brown, the heat-sensitive formula is not reasonable, and the storage time may be short. If the black part of the paper has small stripes. Or the color block is uneven, indicating that the coating is uneven. Paper of better quality should be black-green after heating, and the color blocks are even, and the color gradually fades from the center to the periphery.
(3) Comparison of front and back: Some manufacturers use the "high-tech" method to reduce the cost of the thermal paper of the cash register. The front is very white and bright, adding a large amount of phosphor and calcium carbonate, the reverse is very rough, and the recycled paper is used. This causes the paper to lose a lot of paper dust during printing and cutting, which seriously affects the life of the print head and the automatic paper cutter.
Xiao Bian summary: The price of the thermal printer used in the cash register is not expensive. We should choose the quality that is slightly better. The poor quality thermal paper will not only produce a lot of paper dust, but also affect the heat. The life of the printer will also cause the data printed by the printer to be unclear and stored for a short time.
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