Thermal paper is also called thermal recording paper. On its surface it will be coated with a solid mixture of a dye and an appropriate substrate, such as a combination of Freon dyes, First, the substrate is heated to its melting point, and with that the dye reacts with an acid (the reactant acid in thermal paper is usually bisphenol A (BPA).) The reaction occurs, causing the dye to develop a color, followed immediately by the rapid solidification of the substrate, thus preserving the altered state. However, the lifetime of thermal paper varies depending on the substrate and coating material, and in harsh environments, thermal paper can fade.
Generally, unused, high-quality thermal paper can last for years without failing under proper storage conditions. However, once printed, the image or text on it will gradually fade over time. After printing on thermal paper, the disappearance of the text on it can range from a few weeks to a few months, depending on the quality of the paper and the environment in which it was used.
For thermal paper failure factors, environmental factors account for a large part of the reason, if prolonged exposure to strong sunlight or ultraviolet rays, is to lead to the decomposition of chemical substances in the thermal coating and the loss of color. Thus failing to achieve the normal service life of the thermal paper.
A high humidity environment can cause thermal paper to become damp, which in turn affects its print quality and shelf life. Therefore thermal paper should be stored in a dry, cool environment to extend its life.
Thermal paper in the material can be divided into ordinary thermal material and three anti-thermal material. The preservation time of ordinary thermal paper is generally only about half a year. It can meet the common retail, barcode printing and other fields. And three-proof thermal paper refers to: waterproof, oil-proof, scratch-proof. It has a layer of polyvinyl chloride chemicals on the surface, greatly increasing the protective effect, so that the service life of properly preserved paper can be up to 25 years.
Thermal paper itself does not have a true expiration date, but it does have an effective shelf life. This period depends on a number of factors, including light, temperature, humidity and the quality of the paper itself. It is through proper storage and use that we can maximize the shelf life of the images on thermal paper, thus ensuring that the information is retained.
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