The ink causes the fog version when printing, how to solve it?
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The difference in the raw materials is very large. Even if the same pigments are treated differently, the nature of the pigments varies greatly. This requires the formulator of the composite ink to design the composite ink. Consider this difference.
1. Try to design a suitable resin ratio according to the different characteristics of the raw materials.
Since the inks of various colors have different requirements in the printing process, when designing the formula, the proportion of various synthetic resins in the ink formulation is designed according to the characteristics of the pigment, that is, the oil absorption, the coloring power, the dispersion property, and the like. Can be determined by experiment.
In general, severe fog problems can often be solved by improving the fluidity of the ink, which is due to improved ink flow, that is, low viscosity printing. Reduce the impact of the ink on the scraper so that the scraper can clean the blank portion of the ink very cleanly.
2. Scientific application of body pigments
Adding body pigments (such as YMT ultrafine powder, YMT ultrafine barium sulfate, CC-65 powder, FH-95 powder, etc.) to the formulation is not just a matter of reducing costs. After adding the body pigment, it is filled in the resin encapsulating the pigment, further enhancing the body bone of the ink, reducing the viscosity of the ink under the same printing viscosity, and improving the squeegee performance of the blade.
3, the maximum use of wax powder and OK-412 matte powder to solve the fog problem
Wax powder and matte powder OK-412 is an effective auxiliaries for reducing fog problems. The particles are easily released on the surface of the ink, which enhances the squeegee performance of the blade. However, many manufacturers add wax powder and OK-412 matte powder method, which often does not solve the problem of fog problem. It is recommended to make wax powder and OK-412 matte powder into semi-finished products, and the fineness of ink grinding is qualified. After that, it is added at a high speed and the polishing is not performed, which reduces the effect of solving the fog problem.
4. Improve the compatibility of pigments and synthetic resins with suitable wet dispersing aids.
The purpose of adding a wetting and dispersing aid to the formulation is to solve the problems of the formulation system, including poor pigment dispersion, poor coating of the pigment by various synthetic resins, and poor stability of the system itself. However, if these problems are not solved well, the fog problem will often be caused. It is recommended to use L-18 dispersant and GK-208 additive to disperse black, blue and red pigments.