Solve the problem of slow ink drying
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If the ink is firmly fixed, it is dried from the inside to the outside. In this case, although the surface of the ink solidifies against static pressure, the ink layer is not able to withstand friction.
The ordinary inks used for the printing of Zhang Keke are mainly dried by chemical reaction. The oxidization and polymerization of the ink turpentine are the functions promoted by the desiccant. It is an important component of the ink.
If the ink is not dry enough to resist the pressure of the next print, the paper cannot print the second color.
Worst of all, if the ink takes a long time to dry, the turpentine-containing medium will infiltrate into the paper too much and the ink film's lack of ability to bind the pigment may cause white deterioration. The operator should know that this kind of trouble is very complicated, and its production is based on ink, paper, printing conditions and other unbalanced factors.
Remedy
1. temperature
Since drying is a type of chemical reaction, temperature can affect its drying rate. Control the temperature of the paper or printing room if it is abnormal. Less than 0 from 60?v is the best.
2. Desiccant
If the amount of desiccant in the ink is not enough, pay attention to its characteristics and weight, add some desiccant in the ink. However, adding too much desiccant is not recommended.
3. Control moisturizing water
Too much moisturizing water can make this trouble.
4. Paper moisture
Too much moisture on the paper slows down the drying. In this case, it is best to strengthen the desiccant.
5. The pH of the sink
Too much moisture in the wetted water (low pH) will reduce desiccant activity. The suitable range of PH is from 5.0 to 6.0. At a minimum, the pH should remain above 4.5.
6. Paper PH
For the same reasons as mentioned above, it is very dangerous for the pH of the paper to be too low. When the pH of the paper is too low, such as less than 4.5 for non-coated paper and less than 6.0 for coated paper, a strong desiccant or more usual amount of normal desiccant is required.
7. Sink liquid composition
It is known that some synthetic chemicals in bath fluids can have a negative effect on the drying rate.
8. Varnish
If you find trouble after finishing all the inks, then you have to use varnishes to print them again.