Professionals must know the plate making process requirements
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Details make a difference. As a very important part of the printing process, the plate making process determines the quality and aesthetics of the printed matter in detail. Good plate making makes the print look comfortable and difficult to pick out the problem; bad plate making will make the print look awkward and the details will not be closed. If your print looks weird and there are a lot of problems in the details, 80% is a problem in the plate making process. Follow the plate making process requirements to make your prints more perfect. This article will introduce the plate making process requirements.
Plate making process requirements
1. Product classification: Product classification should be clear, such as books, calendars, cigarette packets, three-side sealing bags, middle sealing bags, medium-sealed folding bags, fuse-sealing bags, film, labels, cover film.
2. Font lines: The text cannot be less than 1.5mm. Try to use isoline text. Small text lines should not be used for multi-color hollowing or overprinting. When embossing, the line width is ≥0.15mm, and the line width when overprinting is ≥0.3mm.
3. Size: A crosshair indicating the size range. Clear cursor size and position.
4. Transition color and shallow mesh: The minimum number of transition colors should be no less than 10%. The transition color length should consider uniform transition without obvious grid connection. For the shallow mesh of 20% or less, consider the spot color so that the ink color is uniform during printing, and no dots are lost.
5. When the word and the background color are the same color, the gap between the background color and the color of the word color should be as large as 50% or more to make the text easy to read.
6. Imprinting, overprinting, and supporting hundreds of issues should be clearly explained.
7. The full version of the background color considers the bleeding 1-2mm, the main function is to protect the finished product during the cutting, so that the background color completely covers the part to be expressed.
8. The requirement for deep engraving or separate engraving of the line version should be noted.
9. Unit length and plate cylinder diameter increment requirement: Based on the factors of ink drying and overprinting during the printing process, the printing material produces tensile deformation under the combined action of drying temperature and tension, and the base film is elongated under a certain tension. After the tension is removed, it is obviously retracted. Therefore, the unit length can be pre-adjusted according to the shrinkage of the material and the process characteristics of the factory and the customer. For example: PET-0.1%, BOPP-0.3%, PA-0.6%, and the like. However, there are many exceptions, such as the size of the extruded composite film will be longer, the customer only allows negative deviation, etc., and needs to be adjusted according to the specific circumstances.
Since the printing material is elongated in the longitudinal direction during the printing process, the diameter of the printing plate cylinder is increased by color according to a certain ratio to compensate for the change of the length direction of the printing material, so as to achieve the purpose of accurate overprinting. The increase in the diameter of the plate cylinder used in the wood industry is 0.3 mm, that is, the first color of the same plate cylinder diameter is the set value, and the color is equally increased from the second color.