Check the content of the printing plate before the machine
1. Color inspection
When receiving a printing plate, first determine the color of the printing plate. There are usually two methods. One is to identify from the angle of the printed screen. The angle of the screen of each color of the printing plate is made into a different angle during plate making. It can be used during inspection The magnifying glass is used to identify the angle of the network line on the printed sample. The second is to discriminate according to the graphic features of the layout and the tone depth. Different screens have different image structures and tone levels. When inspecting, select the characteristic parts with large tone contrast for comparison and identification. Other methods can also be based on whether they have text. , Line, color block and other screen features to identify the printing plate.
2. Inspection of gauge and color code
The ruled lines on the printing plate generally include cross lines, corner lines, middle lines, knife lines and sleeve drying lines, etc., and are selectively printed on the printing plate according to the needs of processing during printing. The cross line is the basis for overprinting of various colors. Some printing plates use yin and yang cross lines, which is conducive to accurate and more intuitive overprinting. The corner line is a rule line generally formed at the four corners by the intersection of two horizontal lines and two vertical lines, and it is the measurement basis when the graphic is positioned on the paper. For the printing plate without positioning holes, the center line is the basis for printing and mounting, and it is very necessary. The knife line is the basis for folding or cutting in the next process. The overprint line is used to check whether the overprinted printing plate is accurate. The color mark is used to identify whether the ink color of the printing plate is consistent with the printed sample, and can also be used as a basis for quality inspection such as reverse color leakage.
3. Check the tone level of the text
Graphic inspections include dot quality, text proofreading, line inspection, typesetting sequence, and coding marks, etc. If problems are found to be repaired in time, they cannot be reprinted. The identification of the tone level is mainly to make the tone and color of the printed matter have a good reproduction. There are two methods of identification. One is to observe the dot percentage of a certain part of the printing plate with a high magnification magnifier, and observe the dot percentage of the same part of the printed sample. 100%, the comparison between the two judges the size of the printing plate dots. The second is to use the control strip or continuous projection ladder to check the depth of the printing plate.
4. Check the cleanness of the printing plate
The printing plate often produces dirty spots due to various factors during the drying process. It should be removed as much as possible before the plate is installed, otherwise the dirty spots will be repaired on the machine after the printing plate is installed, and the difficulty will be greatly increased, and It is easy to destroy the printing plate. The back of the printing plate should be checked. If there is any hard object, it can be scraped off gently with a scraper.
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