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 coloring and stable printing quality. It is widely used by packaging and printing enterprises. Now packaging and decorating products often use resin printing, precisely because of the good printing characteristics mentioned above. However, because the thin solid resin plate material is relatively thin, the larger the core area of ​​the non-inked plate surface, the easier it will be stained with ink, which will make the blank part of the product appear dirty and affect the quality of the product. Therefore, to correctly grasp the printing process technical measures of thin solid resin plates is an important way to improve production efficiency and ensure printing quality.
1. Pay attention to the maintenance of the inking roller and bearing seat, so that the inking roller maintains good inking performance. In the printing process, the plate surface should be evenly inked, and the plate base surface (the blank core part) does not stain ink, which requires ink The roller should have high accuracy. Therefore, the maintenance and use 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 the ink caused by the wear and eccentric core. When printing plate products with ink that is easy to dry and high viscosity, if the machine has a long downtime 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 so that it can maintain the best lubrication effect and prevent the phenomenon of strong friction rolling between the roller shaft head and the roller hole or bearing. If the bearing seat of the ink roller is worn into an eccentric shape (ie, 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. The printing quality of the product.
2. Accurately adjust and use the inking roller to ensure the printing quality. For printing thin resin plates, the position of the inking roller should be adjusted to ensure the printing quality. After the printing pressure and ink volume are determined, the height position of the inking roller can be adjusted, and the contact state 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 adjustment is too high, it is easy to cause uneven ink brushing, and even the phenomenon of slippage may occur, which will cause printing bar marks. If the adjustment is too low, the ink accumulation in the core and the negative image will be thickened, which will easily cause printing staining. . 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 and the amount of ink absorption. The solid plate printing with the printing plate format of more than eight openings has a large amount of ink absorption. It is advisable to use 3 ink rollers to ensure that the plate surface is evenly and fully brushed.
3. The "deep ink thin printing" process is realized by adjusting the ink to prevent the printing from getting dirty. For the thin resin printing process with a thickness of 0.9mm, the printing plate is blank because the height difference between the convex and concave surfaces of the plate is very small The parts are easily stained with ink and make the product dirty. Therefore, it is advisable to deepen the hue of the ink when printing, and the printing ink layer can be thinned appropriately, so that the area of ​​the ink on the plate area due to the large amount of ink delivery can be better avoided, and the product is easily stained. In addition, for some products, the "second overprint method" can also be used to improve the printing effect. That is, the thin ink layer is printed once, and then the thin ink layer is overprinted again, so as to achieve the visual effect of meeting the requirements of printing hue and good ink color quality, and at the same time, it can better prevent the printing from becoming dirty.
4. Keep the liner technology and improve the printing efficiency and quality. In printing, the liner and graphics must be copied onto the printed sheet without distortion, and 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, and uneven marks appear, making the corresponding liner part of the printing plate surface concave Go down, and the corresponding liner in the blank area of ​​the layout is convex, so that it is easy to transfer the thin ink accumulation of the core to the product during imprinting, and the printing is dirty. Therefore, the printed resin plate should be used as a liner, such as cardboard, kraft paper, and film base. In addition, when changing the lining, the inner and outer lining should be tightly packed, 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. The version is easy to wear and other disadvantages.
Fifth, the process technology of the plate mounting operation should be well controlled to ensure the printing quality of the resin plate. Since the resin plate is thin and soft, the reaction to the printing pressure is relatively sensitive. Therefore, the bottom support of the printing plate should be made of metal materials with good flatness and solidity, such as magnetic plate support and aluminum plate support. 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. .
Sixth, make a good version change (starting version) operation essentials to prevent damage to the printing plate. Because the resin plate is soft and flexible, the printing plate base is also thin, and it is easy to stretch and deform. The printing plate is peeled off from the plate support, so that the printing plate is easy to stretch and deform the printing plate or produce creases. When reprinting, it will cause overprinting and blank spaces to appear dirty, 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 a kerosene-dipped ink knife to gradually squeeze and move between the back of the printing plate and the bottom bracket to achieve the separation of the printing plate and the bottom bracket. It provides great convenience for reprinting and improves production efficiency and product printing quality.
7. Keep the resin plate well and improve economic efficiency. The resin plate is a kind of high-molecular photosensitive polymer material. The plate base is a thin film base, which is easy to curl and deform. Therefore, how to store and keep the printing plates well is very important. For unprinted or printed resin plates, attention should be paid to protecting the layout to prevent scratches from foreign objects. The resin plate should be stored in a dry place, pay attention to moisture and high temperature. For the old plate 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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