It is this printing method that is determined by the four elements of the structure and operation of the printing press. The four major elements are: A, doctor blade; B, embossed rubber roller; C, ink supply system; D, drying box. Below I will elaborate on its characteristics and basic principles. A. Scraper Only a squeegee can scrape excess ink (the ink on the non-printing surface) to print a good product. However, if you want to scrape the extra ink clean, without hanging dirt, running ink (running color), and knife line, you must adjust the hardness, height, and angle of the scraper to make appropriate adjustments. How is the device suitable? The usual experience tells us: (1) First of all, the hardness of the scraper device should be moderately flexible. (2) Place the scraper at an appropriate height. (3) The angle at which the scraper is placed, suitable angle. B. Embossing rubber roller The hardness and pressure of the material of the embossed rubber roller directly affect the amount of ink on the printed matter. It is reflected as follows: The hardness of the material of the embossed rubber roller affects the amount of inking. The material of the rubber roller has a small amount of hard ink and the material of the rubber roller has a large amount of ink. The pressure of the rubber roller is large, and the amount of ink is large. The pressure of the rubber roller is small, and the amount of ink is small. The printing plate pattern is deep, and the material of the printing rubber roller needs to be harder; the printing plate pattern is light, and the material of the printing rubber roller needs to be softer. Fast printing speed requires the material of the rubber roller to be harder, and slow printing speed requires the use of a softer rubber roller. C. Ink supply system In order to ensure the smooth progress of printing and the consistency of the ink color of the printed matter, the ink supply system of the printing machine must be well circulated, and the ink should be kept in constant flow at all times. (1) Always maintain the consistency of ink viscosity, measure regularly, and add solvent regularly. (2) New and old inks should be blended and used in proportion. Use compound solvents. To prevent the ratio of ink components from becoming unbalanced, and the phenomenon of precipitation and anti-coarse. (3) It is best to use an ink pump and an agitator to circulate the ink. Note that the ink hopper should not be too large, and the size of the ink tank should be moderate. D. Drying box One of the keys to increasing the speed of the E-port brush is the quality of the oven. The ink is dried by hot air, not baked by heating. And the higher the heat, the harder the ink on the printed matter is to dry. Why? First, the temperature is too high, which will cause the ink surface to condense. False drying phenomenon that does not dry in the surface drying: Secondly, the low boiling point solvent in the ink volatilizes prematurely, the high boiling point solvent remains, and the drying speed is slowed down. Then the drying oven is required, the wind should be greater than the heat, and the temperature can be 40-50 degrees. The wind cannot be directly blown on the film, and the heat cannot be directly baked on the film surface. It must have good exhaust performance and should not be applied to the printing plate and The ink tank runs on the wind, and the drying box has a second return air performance. It is necessary to effectively prevent false drying of printed materials and infections.
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Four elements of the split printing press