Print 128g /? Coated paper with Roland two-color machine, one-color printing cyan, one-color printing magenta, and both colors have large solid areas. When printing the printing plate, the rules are very good, and there is no abnormal situation. When printing to 3000, the transmission line of the printed sheet is very good, and the operation surface has a line error, and the magenta line and the blue line are printed with half lines. Because it did not affect the product acceptance at that time, it was not processed. After the 5,000 printed sheets are finished, when the paper is printed again, a large threading error occurs on the printed sheet operation surface, which is about 0.5mm, and the transmission surface threading has been very good. Shutdown inspection: the blanket is not loose; then it is inferred that it is out of version, but the proofing effect is not obvious; carefully check the paper that has passed, and some of the paper is slightly wrinkled. It is suspected that the big teeth are loose, tighten the big teeth on the operation surface, and quickly correct the version, the problem is

Summary: If a slight crumpled paper is found at the time, you can find out the failure of the big tooth; or you can judge the big tooth failure from the inaccurate set of threads (for the magenta line, it is not in place), then it will to avoid detours.

The two-color machine proofing is much more difficult than the single-color machine proofing. The error of the single-color machine proofing can be corrected within the first line or two lines with the help of the pre-regulation, but the two-color machine cannot, regardless of the first line, two lines, or even a few To be corrected by borrowing a version. Due to the influence of various factors in printing, even if the printing plate is corrected, it is still difficult to maintain the same all the time. Therefore, the proofreading should be both careful and in place. First of all, the clamping screw should be clamped when installing the plate, especially the gripper should be tighter to prevent the plate from being withdrawn during high-speed operation; after the correction of the plate, the plate puller should be tightened; finally, the top plate screws at both ends should also be tightened . In addition, the borrowing mechanism of the next group should be locked to prevent the cylinder from shifting. If you still can't solve the problem, you should find another reason. For high-speed printing, if the work is not done properly, resulting in printing while proofreading, especially for four-color prints with higher printing requirements, this approach is undesirable.

Han Zhijie, a printing house in Puyang Daily News, Henan

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