A case of dirty mark diagnosis of the hottest four

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A case of dirty trace diagnosis of four-color machine printed matter

after the cover of a book is printed by the four-color machine, and then printed by the J2108 monochrome machine, the maximum stress is the ratio limit. Brush the second and third covers. Sometimes, when the back of the printed matter is a large field color block or a large area of shading, a strip of floating dirt nearly 2cm long sometimes appears on it, and the consumption rate should be gradually increased. The color of floating dirt is blue, red and other multicolor. This situation is often mistaken by some operators for the dry printing and dirty back caused by the four-color machine. In fact, when you check the unprinted paper on Feida, you will find that there are no dirty marks on the back of the paper. Control dirty 4. After carefully observing the front mark of the holding test piece, I felt that the dirty mark was caused by being dragged to the back by pressure from the graphic color block on the front, so I thought that the pressure of the brush wheel on the cardboard was too heavy. Reduce the pressure, and the dirt on the printed matter is really gone. This dirty mark is sometimes absent, mainly because some of the prints are dry and some are not dry, so it is easy to cause people to save auxiliary experimental time and make wrong judgments

(Miao Yinbao, Shandong people's printing factory)

reprinted from: Printing Technology

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