The two most common specifications are 80mm×Φ60mm and 57mm×Φ50mm.

Thermal paper is generally sold in the form of rolls. Generally, specifications such as 80mm×Φ60mm and 57mm×Φ50mm are the most common. The first number indicates the width of the paper roll, and the following number is the diameter. Generally, if the width error is 1 or 2 mm, it will not affect the use, because the printer generally cannot print to the edge, but the diameter of the paper roll will have a greater impact on the purchaser.

Because the total length of the paper roll is directly related to the cost-effectiveness of the paper roll, if the diameter is stated to be 60mm, but the actual diameter is only 58mm, the length of the paper roll will be reduced by about 1 meter (specifically less The amount depends on the thickness of the paper), but the thermal paper rolls sold on the market are generally marked X0, and the actual diameter is often less than X0.

Another thing to note is the diameter of the tube core in the middle of a roll of paper. Some businesses will also play tricks on the tube core and use larger tube cores, which will shorten the length of the paper a lot. A simple way is for buyers to bring a small ruler to measure whether the diameter is consistent with the diameter marked on the packaging box. The diameter of the tube core also needs to be paid attention to, so as to avoid being deceived by unscrupulous merchants.

Extended information:

Uses of thermal paper:

Thermal paper: used as a communication carrier for text and graphics on a fax machine, that is, as fax paper; Used as recording materials in medical and measurement systems, such as electrocardiograms, thermal instrument recording paper, etc.; printing paper used in Internet terminals; in commercial activities, used to make trademarks, signatures (POS), etc., among which fax Paper accounts for the largest proportion.

The production principle of thermal paper is to coat particulate powder on an ordinary paper base. The ingredients are colorless dyes, phenols or other acidic substances, separated by thin films. Under heating conditions, the thin films melt and the powders are mixed. A color reaction occurs. The colored writing on the thermal paper is unstable and fades easily, making the document content difficult to read.

Commonly used lottery tickets use thermal paper.

Ordinary thermal paper is not suitable for long-term storage, but good thermal paper can be stored for 30 years or even longer.

Reference: Baidu Encyclopedia - Thermal Paper