There are three printing pressures of flexographic printing press, which will have a great impact on the printing quality of products. They are indispensable. They are described as follows:Carton Flexo Pressure Adjustment

１。 Pressure of inking device: this pressure is the pressure between inking roller and metal anilox roller. Its main function is to control the ink consumption of printing and transfer ink evenly.Carton Flexo Pressure Adjustment

      If the pressure between the two rollers is large, the amount of ink on the metal anilox roller will be less; On the contrary, it consumes more ink.Carton Flexo Pressure Adjustment

       At the same time, if the pressure between the two rollers is too small (i.e. the gap is too large), once the critical point of the anilox height is reached, the function of the anilox roller to transfer ink will be lost, Carton Flexo Pressure Adjustment

      resulting in uneven ink consumption of the printing part on the printing plate, and the ink volume is not easy to control during printing. Carton Flexo Pressure Adjustment

      Finally, the printing film of the printed product is too thick, resulting in drag ink pollution, poor clarity, dot virtual paste, line spreading, virtual hair of handwriting and other disadvantages.Carton Flexo Pressure Adjustment

       If the pressure of the two rollers is too tight (small gap) and the ink consumption on the metal anilox roller is relatively reduced, the dot can be printed clearly, and the words and lines can be printed clearly and straightly, but they lack a certain amount of ink and luster. Carton Flexo Pressure Adjustment

      At the same time, it is necessary to prevent the bending of both ends of the metal anilox roller and the inking roller, the runout of the printing machine gear, tooth fracture, etc. caused by the excessive pressure between the two rollers.Carton Flexo Pressure Adjustment

      This principle of printing pressure generally depends on the characteristics of the product, and the pressure between the two rollers of screen products can be relatively larger; Small text, line pressure can also be slightly greater; Large characters and field products can be relatively small.

       At the same time, the pressure is related to the size of the printing area. Generally, if the printing area is large, the pressure can be lighter to increase the amount of ink, so as to improve the field density, brightness and brightness. Carton Flexo Pressure Adjustment

      Generally, if the printing area is small or more delicate, the pressure should be slightly larger to reduce the amount of ink and improve the clarity of printing. This pressure must be horizontally tangent to both ends of the anilox roller without deviation, otherwise it will affect the clarity and printing effect of the printed matter.Carton Flexo Pressure Adjustment

２。 Pressure of ink transfer device: the function of the printing pressure between the metal anilox roller and the plate roller is to evenly transfer the ink on the metal anilox roller to the printing surface (protruding printing part) of the plate.Carton Flexo Pressure Adjustment

       Whether the printing pressure is correct or not has a great relationship with the dot definition of printing. If the pressure is too heavy, the anilox roller will have a great pressure on the printing plate, and the image dot will expand after printing. Carton Flexo Pressure Adjustment

      (the word and line version become thicker or double shadow), 10% of the outlets at the high-profile position can be expanded to 20% of the outlets, the middle tone outlets jump up, the tone level darkens and deepens, the outlets at the low-profile level fall together, and more than 60% of the outlets are almost on the spot.Carton Flexo Pressure Adjustment

       It can be observed from the magnifying glass that each dot is in the expanded state of double shadow overlap (1-60%). More than 60% of the outlets can not be seen and counted, which is on the spot.Carton Flexo Pressure Adjustment

       In this way, the printed products have the loss of gradation, poor image definition, poor tone restoration and unbalanced three colors;Carton Flexo Pressure Adjustment

       At the same time, because the printing pressure is too heavy, the printing resistance of the printing plate decreases, and it is easy to pile ink, which will produce some disadvantages such as dirty and dirty spots during printing.Carton Flexo Pressure Adjustment

The pressure is too light, the printing plate can’t eat ink, of course it can’t be printed.Carton Flexo Pressure Adjustment

       Optimum printing pressure: adjust the pressure at both ends of the anilox roller and the printing plate roller to make the size consistent, and make the ink layer on the anilox roller just in horizontal contact with the circular cutting of the printing plate. Carton Flexo Pressure Adjustment

       Of course, this “just in horizontal contact with circular cutting” can only be obtained after long-term operation practice.Carton Flexo Pressure Adjustment

３。 Pressure of the embossing device: this pressure refers to the printing pressure between the plate roller and the embossing roller. This pressure is the last key to flexographic printing, which is directly related to the quality of printed products.Carton Flexo Pressure Adjustment

      If the pressure between the two rollers is too high, the printed dot is spread, the middle color is light, and the surrounding is deep circle, which has a great impact on the image level (the text and line version are spread and imprinted on both sides). The dark tone level is easy to be blurred, and if the pressure is too light, the image cannot be printed on the printing material.Carton Flexo Pressure Adjustment

       The correct pressure adjustment makes the pressure at both ends of the embossing roller and the plate roller consistent, and the two are in tangential horizontal contact. Carton Flexo Pressure Adjustment

      When the ink surface of the printing plate is in contact with the printing material, the dot is basically not expanded, the words and lines are clear, the double printing is not spread, and it is best to print all the images.Carton Flexo Pressure Adjustment

       At the same time, in the printing process, it should be adjusted at any time according to the specific situation of printing to keep it in the best state.Carton Flexo Pressure Adjustment