The hottest problems in screen printing

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Problems in the printing process

details determine success or failure. In the printing process, if some links are not noticed, it is easy to affect the printing quality and cause a series of troubles

for the plate printing completed by many people, only the previous process is responsible for the next process, do a good job in the self inspection and self inspection of each process, and strictly control the quality, can we produce the plate printing products that are satisfactory to users. And the perfect match between edition, ink and Guangzhou printing is the prerequisite for obtaining good printing. The quality of printing plate directly determines the quality of printing products. Printing is only the inspection of plate making quality. However, on the premise of stable printing plate quality, its main characteristics are shown in Table 1. Due to the carelessness of printing workers in Guangzhou, ideal printing products cannot be obtained, which will lead to greater waste, defective products or waste products

before batch printing, fix the printing plate first, pour in ink for trial printing, and check the level, ink color, thickness of ink layer, specification, registration accuracy, etc. of graphic reproduction of the layout. If the registration accuracy is poor, it can be adjusted according to the fine-tuning knob in front of the frame; If the color of the ink is wrong, check whether the wrong ink is used and replace it immediately; If the inking is poor, solvent can be used to wipe the image and text part of the printing plate, so that the permeability of the ink and the wettability of the substrate can be improved to a certain extent; If there is a big difference in the order and level of graphics and texts, the printed version should be replaced immediately. The following points must be paid attention to in the printing process

(1) watch the rules frequently. As the plate frame moves back and forth during printing, the printing plate and the frame are collided and vibrated during the round-trip operation, and a small displacement occurs between them, resulting in the phenomenon of inaccurate overprint, which affects the appearance quality of the product. Therefore, we should look at the rules frequently, find and adjust them in time

(2) always check the samples. If ink shortage is found in the print, wipe the plate with a clean cotton cloth immediately. This situation is mostly caused by broken plastic film or ink scaling on the printing plate, drying and blocking the plate. If the ink color is uneven or becomes light, it may be that the ink viscosity is too high. Stop the machine immediately and dilute the viscosity of the ink with solvent. At this time, wipe the graphic part of the layout with gasoline to prevent ink seepage or blocking, so as to facilitate continuous work

(3) semi finished products should be stacked on many pages with random content. During the stacking of semi-finished products, the two sides of the paper must be hung and stacked. Otherwise, the paper forms an upper bow due to its own gravity, and both sides of the paper are tilted up and uneven, which makes it difficult to transmit the paper during printing, and often leads to sheet breakage. If the paper stack is not flat, it can be leveled with cardboard. At the same time, the height of the paper stack should often be adjusted with the adjustment knob of the paper separation mechanism, so that the paper can be transferred smoothly and the printing process can be carried out smoothly

(4) the blades of the drying device are damaged due to long-term use, and some places are not synchronized with the operation of the host machine, often resulting in disordered printing on the paper rack. At this time, you should be quick with your eyes and hands, and immediately take it away from the bottom of the mess. It is best not to make the ink film face to face, so as to avoid sticking and causing defective products or waste products

therefore, only by paying attention to the links that affect the quality of printing and the proportion of plastic granulation performance consumption in China's total industrial energy consumption is nearly 1.5% higher than that in the UK, can we print exquisite prints, improve the yield, reduce consumption and increase efficiency, and make enterprises in an invincible position in the market competition

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