How to improve the brightness of the offset ink layer
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The thickness of the ink layer in the offset printing process is also thinner than that of the embossing, and the brightness of the printed ink layer and the brightness of the printed film are significantly different from those of other printing methods. In particular, the "field" printing-based packaging and decoration printed matter requires bright and thick ink, which causes certain difficulties for offset printing. In order to solve this contradiction, appropriate measures must be taken to improve the printing process. The following should be noted. aspect:
1. The ideal pressure is the primary condition for improving the brightness of the imprinted ink layer. If the pressure is insufficient, the imprint will be emptied, the floating ink will be transferred to the surface of the substrate, and the rubber will be piled up and piled up. Therefore, the pressure should be prevented from being light. "Field" printing can increase the thickness of the liner as appropriate.
2. The water consumption of the layout can not be large, the ink transmission is difficult due to the large water, the imprint is empty, the ink color is uneven (before and after the printing is interrupted), the color is not fresh (the emulsification value is increased and the ink color is diluted), if the "field" area is large or There are many color blocks, and the pH value of the medicine can be appropriately reduced to ensure that the minimum moisture is used without dirty, and the ink volume of the ink fountain is not reduced.
3. When possible, use the ink-jet printing method to use the base color of the light-colored ink, the color of the dark-colored ink, and properly control the interval between the overprinting and the ink to achieve a good ink-stacking effect.
4. The printed “light” can be diluted with a transparent thinner to increase its brightness. High-grade prints can also be diluted with bright light paste. In addition to the special requirements of the product, try to use less white ink as a thinner to print.
5. To dilute the ink, the ink with low tinting strength and low concentration should be selected to meet the needs of the ink saturation of the imprinted ink. The ink with too strong tinting strength is used as the dilute complex color "field" ink, and the printing surface ink The layer is too thin to cause a "flower plate" that reduces the light height.
6. Appropriate addition of dry oil can improve the brightness of “solid” color blocks. For urgent parts, white dry oil and dry oil are added, and red dry oil is added less (usually added in red and black ink, medium blue and dark blue) Can also be added and put), can increase the "solid" brightness, if there is no overprint, you can only add red dry oil, the brightness is stronger.
7. The printing surface is coated with a varnish or a plastic film to enhance the brightness, but at a higher cost.