4, ink balance imbalance
Solution:
(1) The adjustment and use of water rollers and ink rollers are unreasonable. The actual consumption of ink by the printing plate graphic area is underestimated, resulting in the phenomenon that ink is larger than water or water is larger than ink in the printing, and ink-ink imbalance occurs. The ink is darker but the printing plate has no significant water phenomenon. It can be judged that the ink is large. Generally, the ink fountain is closed to stop the ink supply, and after the ink fountain is normal, the ink supply can be continued.
(2) The imprinting is relatively deep and the printing plate water consumption is relatively normal. If ink supply is stopped and the ink supply is stopped, the phenomenon of unclear outline will appear, and the page layout water consumption should be increased.
(3) The printed imprints of India and China were full and dark, and no abnormalities were found in the printing plates. Misunderstanding that the water is less than the ink and blindly increase the printing plate water consumption, resulting in water and large ink phenomenon. Imprinted pinholes were formed. A large amount of residual ink accumulated on the ink roller. The ink roller was too thick and the plate was dirty. At this time, we should take the dual steps of withdrawal and withdrawal of water. The remaining ink on the ink roller was timely shoveled until it returned to normal.
5, printing plate dirty
Solution:
(1) Appropriately increase the concentration of the drug and increase the acidity of the acid;
(2) Incorporation of a certain amount of gum or alcohol;
(3) Clean the layout and remove smudges.
6, the imprinted dry or back to sticky phenomenon
Solution:
(1) Appropriately increase the temperature of the drying room;
(2) Slow down the original operating speed of the printing machine;
(3) Add a certain amount of desiccant.
7. The problem of scratches in the production of printed iron products
Solution:
(1) Check the various factors of the various parts of the printing press transmission that are likely to cause scratches;
(2) Check the operation of the iron suction nozzle and the iron feeding nozzle;
(3) The edge of the cut tinplate can be used as the direction of the teeth;
(4) The stacking of tinplate prints must be neat and orderly.
8, the poor degree of imprinting
Solution:
(1) Strictly control and master the degree of drying of the ink coating;
(2) Strictly control the amount of additives used in the printing ink;
(3) Give full play to the role of adhesion of the iron-plating primer;
(4) For tinplates with thicker surface oil layers, high-temperature baking or manual scrubbing can be used.
9, the issue of print gloss
Solution:
(1) Control the viscosity of the coating coating and add as little diluent as possible;
(2) Prevent dust, particles, and other miscellaneous contamination and contamination.
(3) When changing the type of varnishes, the machine must be thoroughly cleaned to prevent the mixing of different types of glazing paint in order to avoid a series of problems.
Source: China Ink Technology Network