Printing plate structure and manufacturing method thereof

Abstract

The invention discloses a printing plate structure and a manufacturing method thereof. According to the structure, embossed type protruding dots composed of different proportions of screen dots are distributed on the printing plate. The protruding dots are of a big-end-down frustum shape. The tops of the protruding dots are provided printing plate screen dots forming printing screen dots on a printed material. The printing plate screen dots extend upwards to form post heads. The section shape of the whole bodies of the post heads is the same as the shape of the printing plate screen dots. In addition, the embossing heights of the protruding dots where all printing plate screen dots below the standard tone are located are sequentially reduced according to the linear relation. The printing plate structure is used for printing and has the beneficial effects of improving printing resistance rate, preventing the expansion value of the printing screen dots from being enlarged, preventing small printing screen dots from being expanded irregularly and the like. The printing quality is improved, and more artistic patterns can be obtained.

Description

technical field [0001] The invention belongs to the technical field of printing, and relates to a printing plate structure and a manufacturing method thereof. Background technique [0002] The printing process determines that the printing can only use dots to reproduce the continuous tone level of the original. If the image is enlarged, it will be found that it is composed of countless printing dots of different sizes. We can see that although the printing dots are different in size, they all occupy the same space. This is because once the original image is screened, the image is divided into countless regularly arranged printing dots, that is, the continuous tone image information becomes discrete. dot image information. The larger the printing dot, the darker the color and the darker the level; the smaller the printing dot, the lighter the color and the brighter the level. [0003] The shape of the printing dots can be divided into round, square, chain, hexagonal, etc. a...

AI Technical Summary

Problems solved by technology

[0008] As the printing progresses, the printing plate is used for a long time, and the top printing plate dot 105 of the raised point 104 will be worn out. Since the raised point 104 is a tapered structure with a small upper part and a larger lower part, as the wear and tear progresses, the printing plate dot 105 at the top of the raised point 104 will wear out. The area of ​​dots 105 of the plate will gradually increase, resulting in larger dots printed on the substrate after final printing, which will increase the expansion value of dot printing and result in a decline in printing quality

[0009] During the printing process, the pressure exerted by the impression cylinder on the printing plate is the same, but due to the different ability of the printing plate dots with different dot ratios to resist deformation, the deformation of the small printing plate dots is significantly larger than that of the large printing plate dots. As a result, the small printing plate dots are not printed in the expected circle, but in irregular shapes, which seriously affects the printing quality

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