Dirty oil can be divided into two types: one is because the blank part of the layout feels the ink, appears in a greasy state, commonly known as "greasy"; the other is because the ink is emulsified evenly distributed on the layout with very fine particles, commonly known as " Dirty ". The causes of oil contamination are:
(1) Printing plate
a. The printed version is not of high quality (bad version or recycled version);
b. Insufficient exposure time during printing and too low developer concentration;
c. The protective glue on the printing plate is not cleaned;
d. The blank part of the printing plate is oxidized;
(2) Printing machine
a. The pressure on the plate is too light;
b. The pressure between the water rollers is too light;
c. Ink viscosity is too low;
d. The surface aging of the blanket;
e. Paper powder and paper wool wear plate;
f. Improper PH value of fountain solution.
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