How to use monochromatic offset printing press overprint color, simple printing overprint two-color, but generally speaking, most of the overprint single-side four-color, also some printing plant overprint front and back a total of eight colors. This requires the printing press to be of high quality and high precision, but also requires the printing operator to have more exquisite technology, and pay attention to the reasonable arrangement of the printing color sequence in the overprinting process:
The reasonable arrangement of the color sequence of four-color printing machine is: black, blue, red, yellow, and there are also backward color sequence yellow, red, blue, black printing. When printing with four-color machine, the printing interval between colors is short, and the ink has no drying time, which belongs to the wet and wet overprinting mode. While when printing with monochrome machine, the printing interval between colors is longer, and the first color has dried when printing the second color, so it belongs to the wet and dry overprinting mode. It is because of the different overprinting mode, the color sequence arrangement is also different. There are many forms of color sequence arrangement of monochrome machine, but the specific choice of which color sequence can be considered from the following aspects:
1. According to the brightness of the three primary colors to arrange the color sequence to print dark colors first, then print bright colors, that is, blue, black first, red, yellow after printing.
2. According to the transparency of the three primary colors of ink and covering power to arrange the color sequence, poor transparency of blue and black printing, transparency of good yellow and red ink printing.
3. According to the size of the text and text area to arrange the color sequence, print small text and text first, and then print full or large format text and text.
4. According to the characteristics of the original manuscript, color pictures with warm colors should be printed in blue or black first, while color pictures with cold colors should be printed in red or yellow first.
5. From the perspective of overprinting, the color that is more difficult to overprint is printed first. Landscapes are usually printed in blue and yellow order, while images of people are printed in red and yellow order.
The recommended printing color sequence is blue, red, yellow and black when using monochrome machine to print four colors. In this way, as long as the first two colors overprint are accurate and the tone is good, the back two colors overprint even if a little inaccurate will not be too obvious. The operator should pay attention to when changing ink, in order to maintain the purity of the ink, when cleaning the natural ink is about to finish or finish, it is best to add a little about to print the next color ink, and clean it again. Especially when dark ink for light ink, it is best to clean the machine twice
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