The solid resin plate is an ideal plate material for the relief printing process. It is light in material, simple and fast in the plate making process, easy to install and change the plate, and has many advantages such as good ink affinity, full coloration and stable printing quality. Widely adopted by enterprises. However, because the plate material of the thin solid resin plate is relatively thin, the larger the core area of ​​the non-inked plate surface, the easier it is to be stained with ink, which makes the blank part of the product appear dirty and affect the quality of the product. Therefore, correctly grasping the printing process technical measures of thin solid resin plate is an important way to improve production efficiency and ensure printing quality.
1 Do the maintenance of the inking roller and bearing seat to keep the inking roller good inking performance. In the printing process, the plate surface should be uniformly inked and the blank core part of the plate base should not be stained with ink. This requires the inking roller to have a high Precision. Therefore, the maintenance work of the inking roller should be done normally, and the shaft head of the rubber roller should be kept in a good lubrication state to prevent the unevenness of ink inking caused by the wear and eccentric core. When printing plate products with inks that are easy to dry and have a high viscosity, if the shutdown time is longer for some reason during the production, the rubber roller should be cleaned in time to prevent the ink on the surface of the rubber roller from drying, causing the rubber rollers to stick to each other and damage the colloid. In order to ensure uniform ink transfer and plate inking, the printing resin plate should have a set of special inking rollers to avoid printing the letterpress, prevent the colloid from being scratched by the line, and affect the printing quality of the resin plate.
In addition, the bearing seat of the inking roller should be well maintained to maintain the best lubricating effect and prevent the phenomenon of strong friction between the roller shaft head and the roller hole or bearing. If the ink roller bearing seat is worn into an eccentric shape (duck egg hole), it should be repaired and re-rounded in time to eliminate the eccentric core and abnormal gaps to prevent the occurrence of quality defects such as jumping glue, sliding glue and printed bar marks, and ensure the product Print quality.
2 Accurately adjust and use the inking roller to ensure the printing quality. Printing thin resin plate should adjust the position of the inking roller to ensure the printing quality. After the printing pressure and ink supply amount are determined, the height position of the inking roller can be adjusted, and the contact status between the ink roller and the ink-crossing iron roller can be adjusted. The contact between the two ends of the roller should be adjusted evenly, and the contact pressure should not be light. In order to prevent the roller core from being bent and compressed and the roller colloid thermally expanded and deformed, it will affect the normal inking and printing.
The height of the inking roller is adjusted to the extent that the blank space of the plate is as little or no ink as possible. If the position of the ink roller is adjusted too high, it is easy to cause uneven ink brushing, and even the phenomenon of slippage may occur, causing printing bar marks. If it is adjusted too low, the ink accumulation in the core and the negative image will be thickened, which is easy to cause Dirty printing. The hardness of the inking roller should also be selected according to the layout structure. For large-area real-plate printing products, the rubber of the rubber roller should be softer to facilitate the uniform and sufficient ink brushing on the layout and prevent the occurrence of printing streaks. The number of inking rollers used should also be determined according to the size of the printing plate format and the amount of ink absorption. For field plate printing with a printing plate format of more than 8K, due to the large amount of ink absorption, three inking rollers should be used to ensure that the plate is obtained. Brush ink evenly and fully.
3Through adjusting the ink to realize the "deep ink thin printing" process to prevent the printing product from getting dirty. For the thin resin plate printing process with a thickness of 0.9mm, because the height difference between the convex and concave surfaces of the plate is extremely small, the blank part of the printing plate It is easy to stick ink and make the product dirty. Therefore, the hue of the ink should be darkened during printing, and the printing ink layer can be thinned appropriately. This can better avoid staining of the product due to the large area of ​​ink delivery. In addition, for some products, the "second overprinting method" can also be used to improve the printing effect, that is, the thinner ink layer is printed once, and then the thinner ink layer is overprinted again, which can not only meet the printing hue requirements, but also achieve the ink color quality. Good visual effect, at the same time can better prevent the printed matter from becoming dirty.
4. Keep the liner technology and improve the printing efficiency and quality. The layout and graphics should be copied onto the printed sheet without any distortion. The liner plays a crucial role. Because the thin resin plate is thin and soft, if a soft material with a large compression deformation coefficient is used as a liner, it is easy to deform the surface of the liner under pressure, uneven marks appear, and the corresponding liner part of the printing plate surface is depressed However, the lining corresponding to the blank area of ​​the layout is protruding and bulging. It is easy to transfer the thin accumulated ink of the core to the product during imprinting.
Therefore, the printed resin plate should be used as a liner, such as cardboard, kraft paper, and film base.
In addition, the inner and outer lining should be tightly packed when changing the lining, and the thickness and flatness of the lining should also meet the parameters of the equipment specification to prevent overprint errors and deformation of the layout imprint, thickening, burrs, and printing plates. Easy to wear and other ills.
5 Check the process technology of the plate-setting operation to ensure the printing quality of the resin plate. Because the resin plate is thin and soft, and it is sensitive to the printing pressure, the plate support should be made of a metal material with good flatness and solid deformation. , Such as magnetic plate holder, aluminum plate holder, etc. In addition, the plate holder should be fastened to the machine's plate stage when installing the plate, and there should be no bowing or virtual imagery to prevent burrs, ghosting and dirtying of the printed products.
When sticking the plate, the printing plate should be pasted on the plate holder accurately and uniformly at one time, so as not to repeatedly start the plate due to the inaccurate sticking plate, and deform the plate surface to affect the printing effect. When adjusting the printing pressure, the debugging principle of gradually increasing the pressure from light to heavy should be adopted, and the pressure should not be increased blindly at one time, nor can the printing pressure be adjusted from heavy to light.
Because once the pressure is adjusted too much, one will destroy the flatness of the liner, and the other will easily compress and deform the soft plate material, so that the blank space of the printing plate is likely to appear dirty, which will cause obstacles to normal printing. .
6 good methods for changing the plate to prevent damage to the printing plate. Because the resin plate is soft and flexible, the printing plate base is also thin and easy to stretch and deform. Therefore, the printing plate must not be peeled off from the plate holder when pulling the plate, otherwise it will be easy to deform the printing plate or produce creases, which will cause inaccurate overprint and dirty in the blank space when reprinting. Phenomenon, affecting printing efficiency and quality. For this reason, the technical essentials should be grasped and the operation should be carried out carefully.
The author uses an ink knife dipped in kerosene to gradually squeeze and move it between the back of the printing plate and the bottom bracket to achieve the separation of the printing plate and the bottom bracket. It has the effect of fast plate-starting speed and does not damage the printing plate. Great convenience, better improve production efficiency and product printing quality.
7 Do a good job in the storage of resin plates to improve economic efficiency. The resin plate is a high-molecular photosensitive polymer material. The plate base is a thin film base, which is easy to curl and deform, so how to store and store the plate is very important. Unprinted or printed resin plates should pay attention to protect the layout to prevent scratches by foreign objects. The resin plate should be protected from moisture and high temperature, and stored in a dry place. For the old version with strong curl, it can be clamped in a proper amount of paper stack to make it maintain a good flatness, so that it is easy to install and print, and improve the service life of the printing plate.
In summary, as long as we correctly understand the characteristics of the resin plate and master the printing process technology, not only can we improve the printing efficiency, but also effectively improve the printing quality of the product.
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