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This article combed and summarized several cases of uneven ink color of printed products caused by improper manual operation during the production process
01 Water supply
1.
Production printing plate supplying water film is too thick, causing ink emulsification, oil in water, produce severe problems, reduce the rate of ink transfer, ink severely discolored, waste occurs resulting printing coating line coatingol.
In printing production, it is found that the ink color gradually becomes lighter, and sometimes the phenomenon of lightening suddenly appears
2.
One is to reduce the amount of water supplied to the printing plate, that is, set the speed value of the water fountain roller on the operating table, turn the machine to close the ink roller water roller, and adjust the water fountain roller value after a constant speed to make dirty plates appear on both sides of the printing plate.
The second is to put the plate paper on the paper conveying table, feed the paper and press at a constant speed, reduce the speed value of the water bucket roller to make the two sides of the plate paper dirty, and adjust the value of the water bucket roller speed until the two sides of the paper plate are slightly dirty.
02 Pre-wetting value
1.
The pre-dampening value of the machine is set too large, causing the water film on the pre-dampening surface to thicken, and the ink color becomes larger when the printed product is printed.
When printing red and blue overprint products, the ink color is very unstable when looking for the ink color, sometimes reddish, sometimes blue.
After analysis and conclusion, the pre-dampening value setting has a great influence on the ink color, and controlling the pre-dampening value is very important for the stability of ink color search and printing
2.
Decrease the pre-dampening value, and perform trial printing after paper feeding and pressing, so that the printed product has a bit of dirty version phenomenon, and then increase the pre-dampening value, whichever is not dirty, the ink color tends to normal state, and the problem can be solved Resolve
In short, in daily printing production, we must pay attention to enhancing the skills of operators to avoid quality problems caused by improper operation and unnecessary waste
