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 The printing principle of thermal paper:During printing, under the action of the heat of the print head, the hot parts of the thermal paper change ink (the chemical reaction between the leuco dye and the developer produces color), and the non-heated parts do not change color, thus forming text or bar codes to achieve printing Purpose. It is worth noting that the colored handwriting on ordinary thermal paper is unstable and easy to fade, resulting in illegible document content, so thermal paper is not suitable for long-term storage. The good thermal printing paper can be stored for 5 years at room temperature and avoiding direct sunlight after printing. Now there are more long-lasting thermal papers that can be stored for 10 years. However, if the formula of the thermal coating is unreasonable, it may only It can be stored for several months.The structure of thermal printing paperThermal printing paper is generally divided into three layers, the bottom layer is a paper base, the second layer is a thermal coating, and the third layer is a protective layer. The thermal coating or protective layer mainly affects its quality.If the coating of the thermal paper is not uniform, it will cause the color to be dark in some places and light in some places, and the print quality will be significantly reduced. If the chemical formula of the thermal coating is unreasonable, it will cause the storage time of the printing paper to change. It's very short.The protective coating is also critical to the storage time after printing. It can absorb a part of the light that causes the chemical reaction of the thermal coating, slow down the deterioration of the printing paper, and protect the thermal element of the printer from damage.

The advantages and disadvantages of thermal paper should be judged according to the use, generally from the following aspects:1, appearance: good thermal paper outside the view of no impurities, good smoothness, hand feel no obvious rough feeling, transparent to see paper uniform;2, color: high color density, clear handwriting, is one of the most important properties of thermal paper.3, preservation: the preservation of inferior thermal paper is very short, good thermal paper writing generally has more than 2~3 years, special thermal paper preservation performance has more than 10 years. A day in the sun and still maintain a clear color is not bad.4, protective performance: some uses such as labels, bills, need good protective performance, can be applied on thermal paper water, oil, hand cream and so on test.5, print head adaptability: low quality thermal paper wear on the print head, easy to stick to the print head. You can see it by checking the print head.6, environmental performance: if environmental protection needs, need to detect heavy metals, bisphenol A, fluorescent brightening agent. Fluorescent brightening agent only need to see whether there is fluorescence under the detector machine can be seen. Others need to be tested by professional institutions.

The purpose of the paper label and type1: Coated adhesive labels: color general label paper product labels, and more applicable to the pharmaceutical food cooking oil beverage alcohol electrical cultural goods information label 2: Thermal paper sticker: suitable for price tags and other retail USES information such as the label 3: PET (polypropylene) the non-drying label: the fabric is transparent It is used for toilet supplies, cosmetics, electrical and mechanical products. It is especially suitable for the information of high-tech products Oil and chemicals and other performance of the more important product labels.

At present, thermal paper is used as the communication carrier of text and graphics on the fax machine, that is, as the fax paper, and as the recording material in the medical and metering systems, such as electrocardiogram drawings, thermal instrument recording paper and other printing paper used in the Internet terminal.  In terms of commercial activities, it is used to make trademarks, signage and so on, among which the amount of fax paper occupies the largest proportion. As early as the 1930s, people developed thermal recording technology.  Thermal paper is a kind of processing paper, its production principle is in the ordinary paper base coated with particle powder, composition is colorless dye phenols or other acidic substances, separated by the film, under the condition of heat, the film melt, the powder mixed chromogenic reaction.  Thermosensitive recording system is divided into two categories: one is the physical thermal recording paper which uses heat to make the colored pigment into physical color to achieve the recording effect, the other is the use of heat under the action of chemical reaction to achieve the purpose of color chemical thermal recording paper.  Thermal paper which uses chemical method to produce color is dominant. How about the development of thermal paper market? At present, thermal paper in the fax machine as a text and graphics communication carrier, that is, as fax paper.  Used as recording materials in medical and metering systems, such as electrocardiogram drawings, thermal instrument recording paper, etc.  Printing paper for Internet terminals;  In terms of commercial activities, it is used to make trademarks, signage and so on, among which the amount of fax paper occupies the largest proportion. Melt transparent thermal recording paper The use of physical methods of color thermal recording paper melt transparent type, melt transfer printing type, thermal rise and supercooling method.  Melt transparent type is representative. Melt transparent thermal recording paper, using the principle of melt transparency, that is, on the black base paper, coated with a layer of opaque wax as the surface layer, the thermal hair effect, so that the opaque waxy material melt transparency, the color of the bottom of the base paper is revealed and constitute the image.  This kind of thermal paper, widely used in medical electrocardiogram, electroencephalogram or industrial general meter line recording. As the printing cost of ordinary printer increases gradually, thermal printer gradually replaces the market of ordinary printer, the market of thermal printing paper is further opened, and its share in the printing paper market will be more and more large, which is a new trend in the development of printing paper market. Thermal paper products in China accounted for a large proportion of the middle and low grade and part of the supply has exceeded the demand situation.  Analysis of the development trend of thermal paper industry shows that China's high-end thermal paper market is in its initial stage, and the competition of thermal paper is not sufficient.  Foreign manufacturers occupy most of the market share, and some domestic enterprises have increased relevant investment to seize the market share.  The development prospect of high-end thermal paper market is broad. China's thermal paper industry presents industrial cluster effect in the eastern region, with more enterprises concentrated in Guangdong, Jiangsu, Zhejiang and other places.  The developed regional economy and convenient trade conditions give rise to the thermal paper industry cluster in this region, and the effect of scale economy further promotes the growth of regional industry share. At present, China's thermal paper industry presents industrial cluster effect in the eastern region, and more enterprises are concentrated in Guangdong, Jiangsu, Zhejiang and other places.  According to relevant data, in 2020, China's thermal paper market size ranks first in Guangdong province, with a market size of about 419 million yuan, followed by Zhejiang province, with a market size of 388 million yuan.  In addition, Jiangsu, Shanghai, Shandong, Sichuan and other provinces are relatively considerable market scale. On the basis of summarizing the development course of China's industry and combining various factors in the new era, the research report of thermosensitive paper industry gives a careful and prudent prediction and demonstration to the development trend of the industry.