What's the matter with the thermal paper in supermarket
At present, the thermal paper in the market is uneven, and the country has not yet issued a national standard. Many users do not know how to identify the quality of thermal paper. This provides convenience for many merchants to keep inferior thermal paper, causing losses to users The storage time becomes shorter, the writing is blurred, and the printer is seriously damaged. This article tells everyone how to identify the pros and cons of thermal paper, so as not to be fooled again.
What is thermal paper?
Thermal paper is also called thermal facsimile paper, thermal recording paper, and thermal copy paper. In Taiwan, it is called thermal paper. Thermal paper is a kind of processed paper, and its manufacturing principle is to coat a layer of "thermosensitive paint" (thermosensitive color-changing layer) on high-quality base paper. Although there are more than a dozen chemicals used in this color-changing layer, there are at least the following compounds: leuco dyes, which have a wide variety of dyes, and the most commonly used are fluorescent compounds; the color developer accounts for less than 20%, and the commonly used Phenol, p-hydroxybenzoic acid; sensitizers account for less than 10%, which contains benzenesulfonic acid amide compounds; fillers account for less than 50%, commonly used calcium carbonate (fine particles); adhesives account for less than 10%, Such as polyvinyl acetate; stabilizers, such as terephthalic acid dibenzoyl; lubricants, etc. Therefore, the process is difficult and the technical requirements are high.
Thermal printing paper is generally divided into three layers, the bottom layer is the paper base, the second layer is the thermal coating, the third layer is the protective layer, the main effect on its quality is the thermal coating or protective layer, if the thermal paper The uneven coating will lead to dark colors in some places and light colors in some places, and the print quality will be significantly reduced. If the chemical formula of the thermal coating is unreasonable, the storage time of the printing paper will become very short. Good printing paper can be stored after printing (under normal temperature and avoiding direct sunlight) for 5 years, and now there is a long-acting thermal paper that can be stored for 10 years, but if the formula of the thermal coating is not reasonable, it may only be Save for months.
The protective coating is also critical to the storage time after printing. It can absorb some of the light that causes the chemical reaction of the thermal coating, slow down the deterioration of the printing paper, and can protect the thermal element of the printer from damage, but if the protective coating The uneven layer will not only greatly reduce the protection of the thermal coating, but even during the printing process, the fine particles of the protective coating will fall off, rubbing the thermal element of the printer, and causing damage to the thermal element.
Quality identification of thermal paper:
1. Appearance: If the paper is very white, it means that the protective coating and thermal coating of the paper are unreasonable. If too much phosphor is added, the better paper should be slightly greenish. If the paper finish is not high or looks uneven, it means that the coating of the paper is uneven. If the paper seems to reflect strong light, too much phosphor is added, and the quality is not very good.
2. Fire roasting: The method of roasting by fire is also very simple. Use a lighter to heat the back of the paper. If heated, the color appearing on the paper is brown, indicating that the thermal formula is not reasonable and the storage time may be shorter. The black part of the paper has small stripes or uneven color patches, indicating uneven coating. The better quality paper should be black and green (with a little green) after heating, and the color block is uniform, and the color gradually fades from the center to the surroundings.
3. Comparison and identification of sunlight exposure: The printed paper is painted with a highlighter and placed in the sun to expose it (this can accelerate the reaction of the thermosensitive coating to light). Which kind of paper turns black the fastest, indicating that the longer it can be stored short.
The above is the relevant introduction about the supermarket small ticket thermal paper and the quality identification. If you want to know more related information, please pay more attention to this website, which will provide you with more complete, more detailed and updated information .
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