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 plate support material, have a greater impact on the printing pressure, overprint accuracy and ink color quality effects. 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 being shipped back to the printing factory, so that the characteristics of the paper are relatively stable, and then it is put into use so that it is not prone to overprint problems . 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 the appropriate printing plate. 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. 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 of color sequence according to the differences in the structure of the Printing Machine ; Consider arranging the color sequence according to the different graphic structure of the printing layout; arranging the color sequence according to the color characteristics of the original; arranging the color sequence according to the differences in ink characteristics; arranging the color sequence according to the drying characteristics of the ink. Such a scientific and reasonable arrangement of printing color sequence can 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 several colors of the printed product are printed, those that can be overprinted should be overprinted immediately to avoid the expansion and contraction of the printed product due to the long delay, which will lead to the occurrence of inaccurate quality faults.
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Anhui Innovo Bochen Machinery Manufacturing Co., Ltd. , https://www.innovomachines.com