Corrugated cardboard printing adaptability analysis
1.Printing adaptability on surface tension.
We can found that the reproduction of color determined by the transfer of ink, and many people find that the printing press ink transfer is not good in the process. In fact, ink transfer is the most elementary principle of surface tension, ink transfer by increasing the surface tension to set the surface tension value. As an example: ink surface tension is less than the rubber roller surface tension, rubber roller surface tension is less than the anilox roller surface tension, anilox roller surface tension is less than the printing plate surface tension, the printing plate surface tension is less than the cardboard surface tension . If not follow this order, the ink will not transfer up.
From high surface tension to low surface tension, Liquid is not easy to transfer, this is why ink mixed with too much water, the color is not easy to print, and the color would be very light.
Because water has the maximum surface tension, it is between 72 dyne and 77 dyne, and its surface tension will prevent the ink transfer to these objects, when printing, do not mix water.
In addition, when you add a little water to the anilox roller, anilox roller tension will increases, ink sticks easily, so we can handle surface tension appropriately with water.
2.Printing adaptability on PH value.
Low PH value will cause the ink viscosity increased, resin hydrolysis dry precipitation, finally leading to irregular color and poor abrasive resistance. While high PH value will cause the ink viscosity decreased, liquidity faster, paper and plate drying speed slower, printing paste ink and other shortcomings.
3.Printing adaptability on viscosity.
Thinner viscosity is will cause insufficient ink on paper coverage, ink thickness can be adjusted by thickening agent. On the contrary, thicker viscosity will cause poor ink fluidity, too much ink consumption, slow drying on paper and plate, printing paste ink and other shortcomings. It can be adjusted by diluent.
Therefore, when doing four-color printing, we should know about the printing adaptability, the relationship between PH and viscosity. The printing sequence should be from the first color to the fourth color, PH value should be from high to low, viscosity from low to high. we must remember these points.
These are basic principles for printing. If you don't know these principles, you will have a lot of printing problems, but if you can solve the problems according to these principles, it will be much easier to print good products.
Related Products for improving printing quality : Ink Filter, Pneumatic Diaphragm Pump, Doctor Blade, Anilox Roller Cleaner, etc-
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