The thickness of the ink layer of the offset printing process is also thinner than that of embossed printing. The brightness and plain clothing of the imprinted ink layer will be significantly different from other printing methods. In particular, packaging and decorating prints mainly based on "on-site" printing bodies require bright and thick ink colors, which causes certain difficulties for offset printing. To resolve this contradiction, appropriate measures must be adopted in the printing process to improve. Mainly pay attention to the following aspect:
1. The ideal pressure is the first condition to improve the brightness of the blotting ink layer. Insufficient pressure will make the blotting empty, and the floating ink transferred to the surface of the substrate will be exposed. It will also stack plates and rubber, so the pressure should be kept light. "Field" printing can increase the thickness of the liner appropriately.
2. The water consumption of the layout should not be too large. The ink delivery is difficult due to the large water, the imprint is empty, the ink color is dark and uneven (before and after printing is interrupted), the color is not fresh (the emulsification value increases and the ink color is diluted), if the "field" area is large or There are many color blocks, and the pH of the liquid medicine can be lowered properly to ensure that the smallest amount of water is used without dirt, and the amount of ink under the ink fountain is not reduced.
3. When possible, use the overlapping ink printing method, using light color ink as the base color and dark ink as the complexion, and properly control the interval time of the overlapping ink overprint to achieve a good overlapping ink effect.
4. Printing light colors "on the spot" can be diluted with a transparent diluent to improve its brightness. High-end printings can also be dilute with bright paste. Unless otherwise required by the product, try to use white ink as the diluent.
5. The diluted ink should choose the ink with weak coloring power and low density to meet the needs of the color saturation of the blotting ink. Because the ink with too strong coloring power is used as the "solid" ink for the diluted double color, the plate ink will be used. The layer is too thin to cause a "pattern" and reduce the light height.
6. Appropriate addition of dry oil can improve the brightness of the "ground" color block. For urgent items, white dry oil and red dry oil are added, and red dry oil is added less (generally added in red ink and black ink, medium blue and dark blue) Can also be added), can increase the "field" brightness, if there is no overprint, you can only add red dry oil, the brightness is stronger.
7. The printing surface is coated with varnish or plastic lamination film, which can enhance the brightness, but the cost is higher.
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