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As the market and consumer demand increase, more and more variable information needs to be printed on pharmaceutical product packaging, and this demand forces related printing and packaging companies to consider thermal transfer printing technology. Nowadays, thermal transfer printing is gradually “squeezing out” flexographic printing with a rapid offensive. Because for flexographic printing, to print different information, it is necessary to replace the printing plate once every printing, and the thermal transfer printing has design programming, the printing method is not restricted by the printing plate, and the variable can be directly transferred from the database. Information, so in order to reduce costs, some pharmaceutical packaging printing companies began to use thermal transfer printing.

Thermal transfer printing is an indirect transfer of special printing technology. It first prints a special transfer printing paper or transfer printing film, and then transfers the pattern onto the substrate, which is mostly used for ceramic decal printing, textile printing, Product label printing, etc. Thermal transfer printing mainly includes hot press transfer printing, sublimation thermal transfer printing, deinking thermal transfer printing, and flocking thermal transfer printing. The application of thermal transfer printing to flexible packaging printing is still a new attempt in China, and it has been imported from abroad for more than 10 years. In fact, thermal transfer printing has developed very mature abroad. In the United States, Australia and other countries, many multinational companies are producing thermal transfer printing film, printers and supporting high-quality printing fonts.

When foreign companies introduced flexible packaging to China, the domestic market generated a demand for thermal transfer printing technology. Nowadays, flexible packaging using thermal transfer printing technology is no stranger to us. Many batches and shelf life of many instant coffee packages we often see are done by thermal transfer printing. The principle is like an old mechanical typewriter, which transfers the pigment on the film ribbon to the product through the heated word.

In flexible packaging thermal transfer printing, the quality of the printed film directly affects the effect of thermal transfer printing. According to experience, the transfer of the printed pattern is thorough. In addition to the temperature and contact time, the compatibility of the separation layer with the printing ink is the key. The separation layer must have a certain adhesion fastness to the PET film, and the ink layer should be printed. Do not penetrate the past. If the separation layer is not compatible with the ink, it will affect the printing effect of the ink, and even the problem that the printed pattern is not colored, and the transition point of the shallow plate area is missing. In the traditional plastic film printing, the transparency and gloss effect of the film itself determines the gloss of the printed pattern, while in thermal transfer printing, since the final PET film is separated from the printed pattern, the gloss of the pattern itself depends mainly on the ink. The gloss effect and transparency of itself and the separation layer (primer). From this point of view, when selecting inks and coatings, it is necessary to consider the transparency and gloss of the separation layer, as well as its abrasion resistance.

With the continuous development of China's medical and health undertakings, the improvement of people's living standards and consumption power, and the requirements for the pharmaceutical industry, the State Food and Drug Administration has made a lot of applications for glass bottles in the pharmaceutical industry in recent years. limits. In such a large environment, the application of thermal transfer printing technology to flexible packaging of medical products has also been improved.

In the past, both domestic and foreign, the packaging of drip-type drugs for infusion was mostly glass bottles, and the external labels were mainly in the form of self-adhesive. However, glass bottles have been replaced with soft packaging because of the drawbacks of being easy to break, cumbersome, and reusable in use. In addition, since drip-type drugs are generally not OTC drugs, their packaging first focuses on effectiveness, not aesthetics, so the printing on the bags uses thermal transfer printing technology. Its technical requirements can be summarized into the following two points.

1. Non-toxic and harmless, that is, the requirements of its material composition. At present, the material of the thermal transfer printing film for soft packaging of medical products on the market generally has a substrate of PE and a transfer part of pigment and resin particles.

2. Transfer effect. It mainly includes three aspects, namely, printing effect, adhesion effect and transfer to the outer bag after sterilization. Specifically, the printing should be clear in order to read the content, because the content to be printed on the flexible packaging of the medical product is mostly the drug manual, so the requirement for sharpness is high; after printing, the ink can not fall off and transfer to another object again. The phenomenon, because the inner and outer packaging is tightly contacted during the sterilization process, and it is subject to prolonged high temperature sterilization, it is required that the pigment must withstand high temperatures.

At present, the whole heat transfer printing industry has experienced a stage from scratch and gradually matures. Now it has basically developed into a complete supporting system, including thermal transfer printing equipment, printing film and printing template. manufacture. In terms of printing film manufacturing, there is still a considerable gap between China and foreign countries. The main problems are concentrated in uneven coating and poor adhesion. However, from the current situation and trend of China's rapid economic development and rapid improvement of health care level, the rapid growth of demand for flexible packaging of pharmaceutical products is bound to promote the application of thermal transfer printing technology in the pharmaceutical industry, thus promoting a series of domestic industries. Development, especially the research and production of thermal transfer printing films. At present, there are many enterprises in China that produce thermal transfer printing films for non-PVC and PVC flexible packaging bags, and their performance is also constantly improving.

Pharmaceutical products are closely related to people's lives, and the quality of their packaging directly affects people's health. With the wide application of high and new technology in the field of printing, various new and advanced packaging are also emerging. In the new packaging printing method, thermal transfer printing technology has been promoted and applied in the flexible packaging of medical products. It not only has the advantages of flexible printing information, suitable for different substrates and various shaped surfaces, but also the labels printed by this method have certain anti-counterfeiting effects. With the continuous improvement of thermal transfer printing technology and the gradual improvement of printing films, inks and other materials, it is certain that thermal transfer printing will play a greater role in the future packaging of pharmaceutical products.

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