1, the layout of water: In the printing process, if the layout of water is too large, not only make the paper absorb too much moisture and stretch, and will form an oil-in-water type Lu emulsified ink, thus affecting the drying of the print.
2. Excessive addition of desiccant: Excessive desiccant addition and release will make the ink thicker, and the printing plate will be dirty, and the dots will be enlarged and deformed, with hairy pricks, and the imprinting will be difficult to dry.
3. Excessive stacking of printed sheets: If the area of ​​printed sheets is large, the paper surface is smooth, and the stack of sheets is too high, the air is difficult to contact with the printing ink, and the imprinting must be slow and dry.
4. The temperature of the printing shop environment: The temperature of the environment is too low and the humidity is too high to make the ink dry slowly.
5. Ink properties: In general, organic pigments dries slower than inorganic pigments. Thinner binders dry slower than thick binders, and oils with more are slower than those with less oil.
6, diluting agent and lightening agent: diluting agent and lightening agent have the property of inhibiting ink drying, so it is necessary to add a small amount.
7. The nature and structure of the paper: If the paper is acidic, the print will dry slowly. The surface of the paper is rough, the structure is loose, and the permeability is large. A small degree of sizing will promote the drying of the ink, and vice versa, the drying will be slow.
8. The pH of the fountain solution: The hydrogen ion (H+) concentration in the fountain solution is large, and it will react with the metal salt in the dry oil, thus inhibiting the drying of the ink on the surface of the paper.