Thermal paper is the printing paper specially used for thermal printers and thermal fax machines. Its quality directly affects the printing quality and storage time, and even affects the service life of printers and fax machines. The quality of heat-sensitive paper on the market is mixed, and the national standard has not yet been issued, and many users do not know how to identify the quality of heat-sensitive paper, which provides convenience for many businesses to manufacture and sell low-quality heat-sensitive paper, causing losses to users. The light storage time becomes shorter, the handwriting is blurred, and the heavy damage to the printer. This article tells you how to identify the advantages and disadvantages of thermal paper to avoid being cheated again. Thermal printing paper is generally divided into three layers, the bottom layer is paper base, the second layer is thermal coating, and the third layer is protective layer. The thermal coating or protective layer mainly affects its quality. If the coating of thermal paper is not uniform, it will cause some places with dark color, some places with light color, and the printing quality will be significantly reduced when printing. If the chemical formula of thermal coating is unreasonable, it will cause the storage time of printing paper to become very short, Good printing paper can be stored for 5 years after printing (under normal temperature and avoiding direct sunlight), and also can be stored for 10 years. However, if the formula of the thermal coating is unreasonable, it may only be stored for a few months.

The protective coating is also critical for the storage time after printing. It can absorb part of the light that causes the chemical reaction of the thermal coating, slow down the deterioration of the printing paper, and protect the thermal sensitive elements of the printer from damage. However, if the protective coating is not uniform, it will not only greatly reduce the protection of the thermal sensitive coating, but even the fine particles of the protective coating will fall off and rub the thermal sensitive elements of the printer during the printing process, Cause damage to the print thermal element.

Thermal paper is generally sold in rolls, generally 80mm ×Φ 60mm、57mm ×Φ 50mm and other specifications are common. The number in the front indicates the width of the paper roll, and the number in the back indicates the diameter. If the width error is 1 or 2 mm, it will not affect the use, because the printer generally cannot print on the edge, but the diameter of the paper roll has a greater impact on the purchaser, because the total length of the paper roll directly affects the cost performance of the paper roll. If the diameter is 60 mm, but the actual diameter is only 58 mm, The length of a roll of paper will be reduced by about 1 meter (the specific reduction depends on the thickness of the paper), but the heat-sensitive paper rolls sold on the market are generally marked with X0, and the actual diameter is often less than X0. It is also important to note that the diameter of the tube core in the middle of a roll of paper. Some businesses will also use the larger tube core, and the length of the paper will be much shorter. The simple way is that the buyer can take a small ruler to measure whether the diameter is consistent with the diameter marked on the packing box, and the diameter of the pipe core also needs to be paid attention to, so as to prevent the buyer from being cheated due to the lack of weight of illegal merchants.

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