[China Glass Net] The process of transferring ink to the liquid ink film formed by the appearance of the substrate, and the process of becoming a solid or solidified ink film after a series of physical and chemical changes is called the drying process of the ink.
The drying property of the ink is too small, the drying rate of the ink film on the printed matter is slow, and the drying time of the ink film is long, which will affect the quality of the printed matter. as follows:
(1) The drying time of the printing ink film is long, the osmotic excretion time of the ink increases, the permeation and excretion amount of the adjacent material increases, the ink film can not form a solid film layer, the abrasion resistance is weakened, and the imprinting is easy to produce chalking signs;
(2) Due to the excessive amount of permeation and discharge of the ink retaining material, the ink film is not difficult to form a bright film layer, and the color beauty will be affected;
(3) The ink drying rate is too slow, and the printed matter is likely to be sticky. In addition to books, newspapers, and high-speed rotary printing, the slow rate of ink permeation and excretion will cause signs of sticky signs on the reverse side of the print.
The drying of the ink is too strong, the drying rate of the ink is too fast, and various printing obstacles may occur. as follows:
(1) In the printing process, the ink gradually solidified and dried in the notification, and lost the original rheology. At this time, the viscosity of the ink rises, the yield value increases, the mobility and the transferability change, and the signs of ink gathering on the ink roller, difficulty in notification, and ink on the ink roller appear.
(2) In the printing process, the ink gradually dries and the viscosity rises, which causes the paper to produce the paper pull hair sign, and the paper will be peeled off gradually, which affects the normal operation of the printing manipulation process;
(3) As the viscosity of the ink layer increases, the amount of ink accumulated on the ink roller gradually increases, so the amount of ink transferred to the substrate gradually increases, and the ink layer is thickened, which is reflected in the printed matter as an ink layer. Gradually deeper, forming signs of differences in the color of the entire batch of printed ink;
(4) The ink film is dried on the outer surface of the ink roller, which affects the ink transfer performance of the ink roller and makes the printing suitability of the ink roller fall. For example, in the field printing, the ink has signs such as streaks and water marks, which is a manifestation of poor printability of the ink roller.
(5) The drying property of the ink is too strong, the drying rate of the ink layer on the printed matter is fast, and the amount of permeation and excretion of the holding material is small. After the ink layer is dried, the conjunctiva is firm, the appearance is smooth, the greasy smoothness is high, and the adhesion to the latter color ink is adhered. Sexually low. In multi-color color printing, it is easy to cause the crystallization of the printed matter. When the appearance of the substrate is high, the crystallization is more likely to occur.
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