1. The reason is that the ink is not in balance, try to print the highest quality with a minimum amount of water and a small amount of ink when starting up. 2. Due to alkaline paper, the paper coating is usually alkaline. When printing is over-washed, the wetting liquid will be alkaline, resulting in contamination of the non-printed area of ​​the plate. A weak acid can be added to the wetting fluid to maintain the pH between 6 and 7. 3. The adjustment of the water roller is not correct. Check if the pressure on both sides is average. 4. The pressure of the inking roller is not correct, and the pressure streaks should be kept at a width of 3mm (3/16). 5. Wet fluid is excessively evaporated. The temperature of the printing chamber should be maintained at approximately 22C (72F) and relative humidity between 55% and 65%. 6. Ink emulsification, replacement of high-quality emulsified ink.
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