In our daily work, we often encounter that the PS version that has been printed on the machine has found quality problems, and then the PS version has to be removed from the printing machine, reprinted, and the process of publishing is repeated. Since this process includes the printing time of the printing plate and the time of repeating the plate, this has a certain impact on the production efficiency. At the same time, there will often be shirk responsibility between the platemaking and printing departments. For example, due to insufficient exposure of the printing or improper development of the blank part, a small amount of photosensitive adhesive film remains on the plate surface, causing the blank part to become dirty. The best way is to make a reasonable and correct judgment of the printing quality of the PS version before the printing plate is printed on the machine. If there is a printing quality problem, you should make up the printing in time to avoid the situation of downtime and printing. . Below we will discuss how to judge the quality of printing plates.
1. Quality inspection of printing plate appearance
Refers to the external performance state of the printing plate. The basic requirements are smooth, clean, uniform glue, no damage, no creases, scratches, dirt and ink dots.
2. Check the layout specifications
Check the plate size, graphic size, bite size, folding size, folding relationship, etc. To ensure that the size error of the layout is less than 0.3mm, the color version must be correct and not skewed.
3. Examination of graphic content
The basic content is correct text, no missing words, no blind words, the corresponding content of the plate and the text is consistent, the direction is correct, the PS version of the photoresist film is sturdy, not falsified, does not take off the film, and the multi-color set is complete with the color version. The rule line is the basis and benchmark for four-color offset printing. It is required to be thin and black. At the same time, the rule line and corner line are also the standards for cutting paper edge printed products. Therefore, it is necessary to ensure that the rule line is complete and complete; The position of the line, corner line and trailing line ensures that the product size on the printing plate is larger than the finished product size after cutting, to avoid that the corner line and rule line cannot be cut off, and it is unsightly when attached to the printed product.
4. Check the quality of outlets
The dots in the printing plate should be full, complete, smooth, solid, no damage, no scratches, no hollow, and few burrs. Observe and analyze 5% of small dots, 50% of dots and 95% of dots with the help of a magnifying glass of 5 to 10 times magnification, and compare the corresponding color dots of the monochromatic color overlay of the offset printing plate and the proof sheet. If the dot size of the highlight part, middle part and dark part basically matches the sample, it means that the printing plate depth is in line with the requirements of the machine. If the dot is enlarged, the tone is too deep, and if the dot is too small, the tone is too shallow. If the dots shrink and the highlight dots are lost, it means that the graphic color is light, and if the dots expand, the dark white dots are dead, indicating that the graphic color is dark. In general, 2% of the highlight and 98% of the dark tone should reproduce well.
By checking the depth of the tone level of the printing plate, it can be observed whether the PS plate printing, electrical gradation level, dot smoothness, and film are gray, unclear, etc.
5. Color difference and inspection of offset printing plates
After the printing of the offset PS plate is developed, it is necessary to check the color of the printing plate according to the proofed color sample to see if it meets the needs of overprinting. The printing plate with text, lines, and graphics is easier to distinguish the specific color of each printing plate according to the color manuscript; for those overprinting plates that are electrically divided into four colors, it is difficult to identify the color. This requires us to make plate, When imposition, be sure to mark the color of the edge of the version, such as: yellow (Y), magenta (M), cyan (C), black (K), so when you print on the machine, you only need to look at the color type in Chinese and English. You can distinguish the colors. In short, all the overprint products with more than two colors, such as the offset printing logo, electronic color four-color overprint, color pages, etc., must be marked with color blocks to avoid making mistakes in color. In addition, there are often some other substitute symbols on the printing plate to represent the color, the operator should also have a certain understanding, and strictly avoid the phenomenon of wrong on the plate.
6. Examination of graphic and blank parts of offset printing plates
The blank part of the offset printing plate should be clean, tidy and free from dirt. It should be carefully checked to see if there are any dirty spots or scratches on the layout, the oxide is dried up, and there is no leaky photosensitive film. For the dirty areas on the printing plate, you can use the PS version of the revision paste to remove the dirt. The leaked photosensitive film can be corrected with the PS version of the revision pen. For some small layouts, there are problems with plate patterns, dirty spots and other plate patterns. It is not necessarily a new printing plate. The plate surface is dirty due to insufficient exposure or development. You can wipe it with diluted developer to make the printing plate meet the printing requirements. Rescue as much as possible, so as to reduce raw material consumption and improve the printing plate durability.
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