Let's talk about why thermal paper has storage time. Because thermal paper is a special printing paper, its working principle is: input the printing information into the mobile phone app, and then issue instructions to the printer through the mobile phone app, stimulate the printing head to heat up, induce chemical changes in the color-changing layer of the thermal paper, so as to display clear text and images. Therefore, documents printed on thermal paper cannot be permanently stored, and the writing on them will fade over time.
However, the speed of fading is closely related to the quality of thermal paper itself, processing and storage. thermal paper due to the material structure of storage environment temperature and determines the corresponding save time, if on the sun exposure more than 30 and temperature degrees Celsius, can save about ten days , if the commonly used thermal paper in a cool place, keep a year or so also no problem.
Thermal printing paper to preserve for a long time, and its own quality has a great relationship, the quality of the quality determines the quality of the printed data, as well as the long time of data storage, and even in the accumulation of time on the printer's service life will have an impact. Generally, the shelf life we see on the packaging of thermal printers is more than three years, which is a very good thermal printing paper can do. The shelf life of poor quality thermal printing paper is only about half a year, and the shelf life of relatively better thermal printing paper has four or five years.
Thermal printing paper is generally divided into three layers, respectively, paper base, thermal coating, protective layer, generally will affect the quality of thermal printing paper only thermal coating or protective layer of these two layers, then
how to judge thermal label paper is good or bad, here to teach you three small methods:
1. Look at the appearance of the paper
First of all, we can judge its quality by looking at the appearance, when observing the appearance of thermal printing paper, we can first see whether its color is white, if the color is too white, it means that the paper adds a lot of phosphor, and it is to look at the finish of the paper, observe whether the whole paper looks uniform, if the surface is not uniform, It shows that when the heat sensitive layer and protective layer are not good enough, the quality of the paper is not good enough.
2. Grill it on fire
If you can't judge by observation, you can bake the back of the paper with fire, if the color of the paper is brown after heating, it means that the quality of the thermal paper is not good and the storage time is short. If the color is black and green, and the color is uniform, it indicates that the quality of the paper is good and can be stored for a long time.
3. Comparison and identification of sunlight exposure
The printed paper is daubed with a highlighter and placed in the sun (which can speed up the reaction of the heat-sensitive coating to light). Which paper turns black the fastest indicates the shorter time it can be stored.
Therefore, as long as the preservation method is proper, the quality of the purchased thermal paper is not too bad, and the basic preservation of a year and a half is no problem, so you do not have to worry too much about such problems. The fading speed of thermal paper has a great relationship with the environment. The light time is long, the temperature and humidity are high, and the writing on the paper fades quickly.