How long can handwriting on thermal paper be preserved?
How long can the handwriting on thermal paper last? Thermal paper cannot be stored permanently, and the writing on it will fade over time. Generally speaking, the storage time of thermal paper depends on the material structure and storage environment temperature. If exposed to sunlight and the temperature exceeds 30 ℃, it can only be stored for about 10 days. If the commonly used thermal paper is stored in a cool place, it can be stored for about a year.
However, the shelf life of thermal paper is only 2 to 3 years, or even only a few months. Thermal paper with a long shelf life is a long-term thermal paper. At present, thermal paper with good preservation can last for more than 10 years under normal storage environment (avoid high temperature and high humidity, direct sunlight, avoid contact with solvents and plasticizers, etc.). )
Of course, the storage time of three-proof thermal paper is much longer than that of single-proof thermal paper. The single-proof thermal paper is generally stored for about half a year to half a month, and the three-proof thermal paper is stored for as long as one year or even 2-3 years due to its own properties.
Generally, supermarket shopping receipts are printed on thermal paper. Thermal paper has a special advantage, that is, the printing speed is faster and does not require ink. Its failure rate is also relatively low, and the cost is also very low. Of course, it also has shortcomings. The disadvantage is that the handwriting on it cannot be stored for too long. Whether due to light, friction, oxidation, etc., the words and images on his paper quickly disappear.
Many supermarket shopping receipts are printed on thermal paper, and the thermal coating on the receipts will fade after being oxidized in the air, and the writing will disappear. Generally, the thermal coating can be used for about two months after printing. If we want to use it as a proof of consumption, it is best to use a formal invoice.
Citizens only need to scrape the receipt with force on their fingernails. If there are deep scratches on the white paper, it is thermal paper. In daily life, people inevitably come into contact with thermal paper receipts. To reduce harm, we should try to take as few receipts as possible. Wash your hands immediately after touching thermal paper, do not use alcohol-based cleaning fluids. And don't touch the mouth directly with the hand that has already touched the receipt.