Overprint Ink Effect Of Color Printing

        We know that for overprint and overprint printed matter, in order to meet the requirements of thick ink color, good brightness and satisfactory visual effect.Overprint Ink Effect Of Color Printing

      The organic cooperation between ink blending and printing is very important, but the specific situation should be handled separately according to different conditions. Overprint Ink Effect Of Color Printing

       For example, when the surface of the printing paper is smooth and the ink absorption is poor, the printing ink layer of the background color should be thinner to avoid sticking and dirt during overprint and color registration.Overprint Ink Effect Of Color Printing

         In addition, if the background color is properly printed, it is thinner, the effect of color overlay printing is good, and it is conducive to the drying of overprint ink layer.Overprint Ink Effect Of Color Printing

        For offset paper products with rough surface and large ink absorption, the ink amount of the background color should be appropriately thickened, so as to lay a good foundation for obtaining flat and thick gloss. Overprint Ink Effect Of Color Printing

       When printing the laminated overprint plate, the ink layer is thinner than the background color, and the allocated ink color is slightly lighter than the original color.Overprint Ink Effect Of Color Printing

       Because the background color is basically close to the original color, and the overprint will be deeper than the original.Overprint Ink Effect Of Color Printing

       In order to ensure normal color registration and prevent the adverse effect of over printing due to the difficulty of ink drying, an appropriate amount of dry oil shall be added according to the ink absorption of the layout when printing the background color and color stacking plate, so as to ensure the printing quality.Overprint Ink Effect Of Color Printing

        Generally, the dosage of white dry oil is: resin ink 2% – 5%, oily ink 3% – 10%; The dosage of red dry oil is about 2%. Overprint Ink Effect Of Color Printing 

       Due to the influence of dry oil on ink color, white dry oil is mostly used in light color ink, while red dry oil is mostly used in red and dark ink to avoid deviation of ink hue.Overprint Ink Effect Of Color Printing

       If you overprint on the background color of the red or yellow version and print gold on the background color, you can make a field version in addition to the blank part to print transparent yellow or bright diluent to increase the gloss of the field version.Overprint Ink Effect Of Color Printing

       In order to ensure the overprint quality and prevent over bottom imprinting.Overprint Ink Effect Of Color Printing

       In addition to overprinting black words on the gold plate and the background color with white ink diluent, generally, black words can be printed first and then a large area of background color plate, so as to avoid the friction and scratch of the background ink layer on the print on the machine.Overprint Ink Effect Of Color Printing

        In addition, in order to ensure the accuracy of overprint, after the base color needle position (i.e. rule) is determined.Overprint Ink Effect Of Color Printing

       When the overprint position is adjusted by the overprint loading plate, only the position of the printing plate can be adjusted, Overprint Ink Effect Of Color Printing

       not the position of the front gauge and side gauge, so as to avoid the invisible “water wave line” unevenness at the edge of the paper, which affects the stability and accuracy of overprint.Overprint Ink Effect Of Color Printing

       For the pattern of Yin-Yang overprint, one of the plates can be appropriately expanded to overcome the inaccurate overprint caused by the expansion change of printed products caused by the defect of machine accuracy and the change of ambient temperature and humidityz.Overprint Ink Effect Of Color Printing

       Resulting in white leakage of the plate and affecting the product quality.Overprint Ink Effect Of Color Printing

       In addition, pay attention to adjusting the printing pressure. Too much pressure will also deform the print, resulting in inaccurate overprint. Overprint Ink Effect Of Color Printing

       In addition, the lining thickness should also be standardized. 

Overprint Ink Effect Of Color Printing

       Too large or too small thickness will make the printing layout out of shape and cause inaccurate overprint. Overprint Ink Effect Of Color Printing