The medical label is an indispensable product identification of medicines. It can be said that it is also the ID card of medical products and an important production process in the packaging and printing process. The main contents of the pharmaceutical label should usually include: product name, adaptation symptoms, production date, production batch number, specifications, quantity, precautions, shelf life, dosage usage, storage environment requirements and manufacturer name. Product labels are printed in single color, overprinted or overprinted in multiple colors; printed in offset paper, coated paper and other self-adhesive paper. From the perspective of health and safety, the quality control of medical label printing is a very important technical link. Therefore, the instruction text in the product layout must be clear and clear, and the printed colors must be accurate and consistent. It can be seen that the medical label should have requirements for easy identification and good anti-counterfeiting effect. A considerable portion of medical labels are printed using the traditional letterpress printing process. In the past, in the past production practice of the machine, I have printed many medical label products, and I have a personal experience of the relief printing technology of medical product labels. Here, I will talk about the experience of process technology control on the practice of letterpress printing. 1. The reasonable design of the printing color of the medical label layout Medical products are the depository of safety and health, so the rational design of the color of the printed layout is very important. Medicinal labels generally use neutral series of colors, of which the cold-tone printing layout can give patients a sense of tranquility. The design of light red, golden red, and golden printing layout can make patients feel with vitality, yang, health and vitality. The blue and silver layout design can give patients a sense of security. The color design of the printing plate can also be matched according to the differences in the characteristics of the drugs. Among them, the nourishing and nutritional drugs are mainly designed in gold, bronze, brown or red in the printed layout, and are appropriately matched with other colors. Analgesic, sedative, hypnotic, antihypertensive, and cardiovascular diseases should be based on green and blue. Insect repellent packaging, mainly white with other light colors. Anti-inflammatory cold medicines such as cough and phlegm, Qingliangjiedu granules are usually printed in green. The reasonable design of the printing color of medical labels can make the patients have a good psychological and physiological feeling, and make the product packaging have a better use effect. Second, use the principle of the three primary colors to make accurate ink preparation The pure color of medical label printing is the basic requirement for product quality. Therefore, how to make accurate ink preparation is a very important technical link. According to the principle of the change of the three primary colors, in addition to the gold and silver colors (the substrate is the material of aluminum spray paper), any color can be mixed and mixed using different proportions of the three primary colors. For example, the three primary colors of ink can be mixed into black after being mixed in the same amount. The three primary colors of ink are mixed in equal amounts and white inks of different proportions are added to form light gray inks of various shades. If the three primary color inks are mixed in various proportions, it can be blended into a variety of intermediate colors or multiple colors, but the hue is biased to the primary color hue with a large proportion. If the two primary color inks are mixed in equal amounts, they can be adjusted to the standard intermediate color; after the two primary color inks are mixed and mixed in different proportions, they can be mixed into a variety of different color hue, but the hue tends to be a large proportion of the primary color Hue. In addition, in any color ink, the hue appears brighter after adding white ink. Conversely, after adding black ink, the hue becomes darker. Whether the method of blending ink colors is appropriate will directly affect the color quality of printing. Therefore, when distributing inks, it is necessary to analyze the excellent appearance according to the original manuscript, and determine which kinds of inks should be used to dispense. For example, to adjust the lake blue ink, it can be preliminarily determined based on visual observation and practical experience. Among them, white ink is the main color, and peacock blue is the auxiliary color. It should be slightly added. As long as the main color is determined, the other colors are auxiliary colors, which should be added gradually and evenly. Then, use one of the two pieces of paper (the same as the printing paper) to apply one point of adjusted ink, and use another piece of paper to scrape it to roughly the thickness of the printed ink layer. See if it is appropriate. When comparing samples, it is necessary to scrape the ink layer on the paper where the ink layer is relatively thin and light to see it more accurately. When adjusting the ink, you should also master a principle, that is, use inks of different colors as little as possible, that is, if you can use two inks, you should not use three inks to adjust, so as not to reduce the gloss of the ink. On the other hand, the color tone of the scratched sample is slightly darker than the original color, so that the printed color sample can be accurate or close to it. After the ink tone of the sample is accurate, you can adjust the ink in batches according to their respective proportions of ink. 3. Several technological measures to improve the printing quality of label products 1. Pay attention to the technical control of the paper cutting process. The accuracy of the paper specifications directly affects the overprint accuracy of the product. Because of different machine structures, the positions of their front and pull gauges are not the same. In this way, if the edges of the paper are not cut square enough, and there are beveled or wavy edges, it will cause overprinting. This requires products with glue and convex joints. The sides of the paper must be cut into right angles and straight lines, and there must be no beveled or wavy edges. In order to improve the cutting accuracy of the paper, the thickness of the cutting must be strictly controlled, because the thicker the paper stack and the softer the paper, the more the paper surface deforms when the paper press is pressed, so the thickness of each stack of cut Less is more conducive to improving the cutting precision of paper. In addition, the edge of the blade should be kept sharp, and the appropriate blade angle should be selected according to the hardness of the paper, which is also an important measure to improve the cutting accuracy. 2. Pay attention to the reasonable selection of the bottom plate of the printing plate. Relief printing machines with a round flattening structure, the characteristics of the base material of the printing plate, have a great influence on the printing pressure, overprinting accuracy and ink color quality effect. The traditional wooden undercarriage has poor material, squareness, flatness and stability. It is prone to bowing and deformation, and the printing quality is difficult to guarantee. Therefore, letterpress printing should use solid, flat, square, stable and metal materials such as aluminum or cast iron, which is a reliable guarantee for improving the accuracy of overprinting and ink color quality. 3. Pay attention to the rational use of paper. Paper is very sensitive to changes in the temperature and humidity of the external environment. Especially the paper just produced is most prone to expansion and contraction due to changes in temperature and humidity, resulting in inaccurate product overprinting. In order to reduce the chance of this bad situation, the paper that has just been produced is usually stored for about half a year after it is shipped back to the printing plant. After the paper's characteristics are relatively stable, it will not be easy to overprint after it is put into use. In addition, you can also hang and dry the paper, and put the cut paper in the printing workshop for several days, and balance it with the temperature and humidity of the printing workshop for a period of time, and then printing is also conducive to the registration of the product. 4. Pay attention to choose a suitable printing plate material. The relief printing process uses a variety of plate materials such as copper plate, zinc plate and resin plate. Due to the different characteristics of the plate material, their printability and print quality also have obvious differences. According to the ink affinity, ink transfer and gloss In terms of degree and pressure effect, the resin version performs best, the copper version is second, and the zinc version performs the worst. Judging from the printing quality of the dot, the dot printing quality of the copper plate is better, and the expansion rate of the dot is also the least. Therefore, according to the characteristics of the product, it is necessary to choose the plate material for printing in order to improve the printing quality of the product. 5. Pay attention to the reasonable arrangement of printing color sequence. Reasonable arrangement of printing color sequence is an important measure to improve printing quality. Therefore, reasonable arrangement of printing color sequence should mainly be considered from these aspects, namely: consider the arrangement of printing color sequence according to the characteristics of the substrate; consider the arrangement according to the difference of the printing machine structure Color sequence; arrange the color sequence according to the different graphic structure of the printing layout; consider the color sequence according to the color characteristics of the original; consider the color sequence according to the difference of the ink characteristics; arrange the color sequence according to the ink drying characteristics, so that the printing color sequence is arranged scientifically and reasonably , Can better improve production efficiency and product printing quality. 6. Pay attention to the lining process technology. The liner is the medium that realizes the transfer of pressure and imprint. What its characteristics also affect the registration and ink quality of the product. Therefore, the deformation coefficient of the lining material should be smaller, and the material should be neutral and hard. At the same time, the thickness of the lining must be determined in strict accordance with the technical parameters of the equipment specifications. In addition, the liner must be tightly packed, and there should be no looseness or bulging. Avoid repeated patching or hollowing on the liner to prevent overprinting and ghosting. 7. Pay attention to adjust the appropriate printing pressure. The printing pressure should be adjusted evenly and moderately. If the pressure is too large, the printed sheet will be stretched and deformed, which will cause the disadvantage of overprinting. Therefore, proper printing pressure should be adjusted. There should be no bias in the printing pressure, so as to avoid roughness and expansion of the edges of the printing plate. 8. Pay attention to master the product overprint production cycle. After the previous color or colors of the printed product are printed, those that can be overprinted should immediately perform overprinting, so as not to cause the expansion and contraction of the printed product due to too long time, which will lead to the occurrence of inaccurate quality faults. 9. Take care to prevent the printed matter from sticking and staining. When printing medical label products with letterpress technology, when the paper surface has good gloss; the acidity of the paper affects the drying of the ink layer; the printing ink supply is large; the ink drying speed is slow; when the semi-finished products are stacked too high, it is easy to cause the back of the product Rubbing dirty. The solution is to use the "deep ink thin printing" process for printing, that is, to adjust the ink hue a little deeper and make the printing ink layer thinner, so that it can not only meet the printing ink color requirements, but also reduce the chance of sticking. In addition, you can add a little dry oil to the ink to make the ink layer dry in a timely manner; add an anti-sticking agent to the ink to make the ink layer on the printed surface less prone to transfer; spray the surface of the printed ink layer properly to prevent The surface ink layer is transferred to the back of the printed product; the stacking amount of the printed semi-finished products is appropriately reduced, and a small stack of semi-finished products is hung out using a drying rack. 10. Pay attention to prevent the lay-up phenomenon on the printed page. When the printing pressure is uneven or too heavy, the ink particles are too coarse, the ink fluidity is poor, the paper surface is powdered, fluffed, the position of the ink roller is not adjusted well, and there is poor contact between the ink roller and the ink roller. It is easy to cause scumming, and corresponding measures should be taken to adjust this. 11. Pay attention to prevent the crystallization of the ink color on the printing plate. When too much dry oil is added to the ink, the ink layer on the surface of the printed product is excessively dried to form a glass surface, making it difficult for the overprinted ink color to adhere to the background color of the printed product. Even if it can be printed on, the ink color only shows obvious flowering phenomenon. It is the phenomenon of ink film crystallization. To prevent the crystallization of printed ink film, it is necessary to strictly control the amount of dry oil and try to shorten the overprint production cycle. For semi-finished products that have already crystallized, add soap debris to the overprinted ink. The method is as follows: after mixing soap crumbs with resin oil into a slurry, and then adding it to the ink, it is easier to stir evenly. After adding soap and debris to the ink, you should also add a little dry oil, otherwise, the overprinting ink layer will appear to dry slowly. 12. Take care to prevent the ink color on the printing plate from blooming. When the printing pressure is uneven or too light; the surface of the liner is deformed by compression and loses good flatness; the paper surface is powdered, fluffed and adheres to the plate or ink roller; the eccentric core of the ink roller causes uneven ink application; Crystallization of the ink color of the printing plate and the presence of too much anti-sticking agent in the ink or the lack of even stirring are likely to cause the printing ink color to bloom, and corresponding measures should be taken to deal with it. 13. Pay attention to the protection of semi-finished printing products. If the climate is fickle, the semi-finished product after printing should be sealed with plastic film to avoid expansion and contraction and to ensure the quality of the product's overprint. In summary, improving the printing quality of medical product labels is the basic requirement for product usage characteristics. Medical product labels with good printing quality can give people a sense of credibility and security when used. Therefore, correctly understanding the control technology of medical product label printing process and adopting advanced technical measures to control the printing process are not only effective To prevent the occurrence of various printing defects, and can better improve production efficiency and product printing quality.
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