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What factors should be considered in flexographic plate design?
Jan 08, 2019

Since the flexographic plate is soft, has certain elasticity, and has a relatively large thickness, when it is pasted on the printing cylinder, the longitudinal direction of the printing plate is deformed with respect to the circumferential surface of the drum, and the thickness is larger. In the version, the surface of the printing plate is deformed more and more after the pasting, and thus the printed image and the original size are in error. If it is the printing layout of the dot structure, the increase in the dot size is the main problem causing the printing color deviation. Therefore, the technical control of the flexographic plate design process is in place and has a great impact on the printing quality.

     Therefore, in the plate making design, according to the plate elongation of different thicknesses, the layout should be appropriately reduced according to the characteristics of the plate material at the time of plate making, so as to avoid the printing plate size being larger than the original plate size. For the printing of the dot layout product, the dot gain should be compensated by adjusting the flexographic separation characteristic curve before the film is produced.

Due to the difficulty in obtaining a good reproduction of the fine dots of the flexographic plate during the plate making and printing process, especially the high-gloss dots tend to be lost. And the soft printing plate under the action of pressure, the dark-adjusted dot portion is prone to increase, paste and become solid. The increased deformation of the dot will result in a lack of layering in the printed layout, and the quality of the printed copy will be significantly reduced. Therefore, for the design of the dot tone and the number of lines, it is determined according to the hardness of the substrate and the gloss of the surface. Generally, the substrate is relatively soft, and the paper surface is not very smooth. The high-gloss layout should be considered to increase the dot properly. Generally, the dot of the high-gloss portion of the layout is designed to be no less than 4%, and the dark-tone dot should be controlled within 85%. Usually, the number of screen lines of the printing plate is mainly determined by the quality of the printed materials, and the number of screen lines of the corrugated box is obviously smaller than that of the preprinted carton. If high-grade coated whiteboard is used, it is now printed with high-performance flexographic equipment, and the number of plate-making lines can reach 175 lines/inch or even higher.

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