What is four-color flat net? Four-color flat net is the color is very light, the dot is basically less than 50%; The four-color flat net is to use black (K), red (M), blue (green C), yellow (Y) about 50% and the light color of the dot hit out, the flat net is very difficult to print, easy to get bars, and the color difference is seriously not controlled. Generally the most test of the printing press is this full bottom of the large flat net, the machine is good, printing the product can be seen. If printed out, the whole page color is very uniform, there are no ripples, the machine performance is relatively good. However, no matter how good the machine is, generally two or three years later, the printing of this four-color flat screen product will be more or less uneven.

Therefore, the product of Puzzle books printing is difficult to print, the printer can only try to control the color deviation is not too large, before printing products in large quantities, first replace the machine tape and the backing paper, but also adjust the ink stick and water stick, clean the plate drum, the back drum and the roller pillow, after the color is stable, in the mass printing as little as possible stop. Do not add ink to the ink fountain during the printing process, so as to avoid serious changes in color.

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