In order to achieve better color reproduction in the process of printing kraft paper bags, it is actually more difficult than printing with SBS paper. In particular, it is necessary to achieve accurate color reproduction on ordinary kraft cardboard, which requires more care than printing on bleached kraft cardboard. As the color of ordinary kraft paper of kraft paper bag itself is dark brown, the effect of printing ink is very different from that of printing on bleached paper. Therefore, the ink used needs to be bright in color, and the color used should be more eye-catching, so that the printed kraft paper bag will have a better effect. It is difficult for light and soft colors to achieve the desired ink density, opacity and abrasion resistance.
In addition, if necessary, a little white can be added to the ink printed on the kraft paper bag, which will help to achieve the desired soft tone or light color, which is very useful for duplicating soft colors and light colors. With the increasing maturity of kraft paper bag printing technology, manufacturers will use UV ink to effectively improve the printing color effect. At present, almost all ink manufacturers have developed inks for primary color cardboard, and many ink manufacturers have also developed inks for printing on kraft paper. Therefore, before determining the best solution for work, you should consult with the ink manufacturer. Choose different formula inks according to the printing needs of the kraft paper bag manufacturer. Refer to the ink chromatogram provided by the ink manufacturer and the printing effect of the ink on different papers, and finally determine your choice The best ink.