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01 Ink color
Increasing ink color density is one of the main methods to increase ink hiding power.
Although its hiding power after printing is better than ordinary white ink, it still does not meet the requirements.
02 Ink thickness
We know that the thickness of the gravure ink layer can reach 8-15μm, but if the gravure white ink layer is only 3-4μm that does not meet the standard, problems will occur.
(1) Plate cylinder production
Therefore, although the ink storage capacity is increased, the ink transfer volume cannot be increased.
(2) The hardness of the embossing rubber roller is too large, and the printing material is soft, resulting in too little ink transfer in the cell
picture
(3) The printing pressure is small, which causes the ink in the cell to be squeezed and poorly transferred.
(4) The storage time of the film is too long after the surface treatment, resulting in poor ink wetting and adhesion, so it should be printed in time after the surface treatment of the printing material
(5) The pigment concentration of the ink is too large, which causes the drying speed to be too fast and affects the ink application
(6) The static electricity of the film is too large during printing.
(7) Consider the performance of the printing press
After taking the above measures to print, the thickness of the ink layer has increased significantly, but the white ink hiding power still does not meet the expected requirements, so the problem of the gravure ink itself must be considered again
03 Pigment dispersion
The hiding power of the ink essentially depends on the ratio of the refractive index of the pigment to the refractive index of the binder
The pigment of the white ink used in the test is titanium dioxide
Other printing methods use ordinary pigments, thinner ink layers and lower color density can achieve the required covering effect, but gravure printing cannot
If you use an ink made of titanium dioxide with an appropriately increased particle size for printing, the hiding power of the white ink will increase.
This method saves time and effort than increasing the ink color density and ink layer thickness, and can also reduce production costs
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