Guanhua Science Classroom – BPA Free Thermal Paper

Thermal paper is also known as thermal fax paper, thermal recording paper, thermal copy paper, and in Taiwan, it is called thermal copy paper. Thermal paper is a processed paper whose manufacturing principle is to coat a layer of “thermal paint” (thermal discoloration layer) on high-quality base paper. There are more than a dozen chemicals used in this color-changing layer.
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Thermal paper was first developed by 3M Company in the United States in 1951. In 1965, Texas Company invented the thermal print head, named: silent 700 (silent700), which was used in supermarkets on a large scale in 1969. In the following 20 years, due to the technical problems of the color body have not been properly solved, the progress has been relatively slow. In the late 1970s, due to the innovation of the miniaturization of thermal elements by Japanese manufacturers, the upgrading of fax machines and the new generation of fax machines. In the early 1990s, inkjet printing, laser printing and electronic printing technologies appeared one after another, compressing thermal printing to the very limited field of running water vouchers such as supermarket cashiers and bank receipts. Later, due to the obvious advantages of thermal paper and the easy portability of the equipment, thermal paper has been widely used, and the development speed is getting faster and faster!

When the thermal paper is heated, the colorless dye and the developer react chemically to produce color, so when the thermal paper is used to receive signals on a fax machine or print directly with a thermal printer, the graphics and text are displayed. Since there are many varieties of leuco dyes, the color of the handwriting displayed is different, including blue, purple, black and so on. However, the colored handwriting on the thermal paper is unstable and easy to fade, which makes the content of the document difficult to read. The most commonly used lottery tickets are thermal paper. Ordinary thermal paper is not suitable for long-term storage, but good thermal paper can be stored for 30 years or more.

The quality of thermal paper directly affects the printing quality and storage time, and even affects the service life of printers and fax machines. The thermal paper on the market is mixed, and the country has not yet issued a national standard. Many users do not know how to identify the quality of thermal paper. Many merchants produce and sell low-quality thermal paper, causing losses to users, and the light storage time is shortened. The writing is blurred, and the printer is severely damaged. Let Guanwei tell you how to identify the pros and cons of thermal paper, so as not to be fooled again.

1. Appearance: If the paper is very white, it means that the protective coating and thermal coating of the paper are unreasonable, and too much phosphor is added, and the better paper should be slightly greenish. Poor paper finish indicates uneven coating, and if the paper appears to reflect light, too much phosphor has been added.

2. Fire roasting: Use a lighter to heat the back of the paper. If the color on the paper is brown after heating, it means that the thermal formula is not reasonable, and the storage time may be relatively short. If the black part of the paper has fine stripes Or uneven color blocks, indicating uneven coating. Better quality paper should be dark green when heated, fading from the center to the periphery.

3. Comparison and identification of sunlight exposure: apply the printed paper with a highlighter and place it in the sun. Which kind of paper will turn black the fastest, indicating that the shorter the storage time.

In daily life, we inevitably come into contact with thermal paper receipts, so we often come into contact with bisphenol A, the main component of thermal paper. Please do not touch your mouth and food with your hands after touching the thermal paper. After touching the thermal paper, please wash your hands immediately if possible. Be careful not to wash your hands with alcohol-based hand sanitizer! !