Regarding the application of ink, the author will analyze the relationship between the correct adjustment of ink and the quality of printed products through five typical cases that he deeply understands.
Case 1: Poor ink overprinting
When the author company printed a batch of handbags, the magenta dots of the latter color group and the cyan field of the previous color group were poorly printed, resulting in many spots on the printed matter. Although the viscosity of the magenta ink is repeatedly lowered, it is desired to increase the overprinting rate, but the effect is not good.
Case study: The multi-color machine finishes printing in a short period of time. The overprinting method of the ink is wet and wet. If the printing color sequence is improperly arranged, the ink overprinting rate will be greatly reduced. Therefore, according to the characteristics of multi-color machines, the following basic principles should be followed when arranging their printing color sequence:
(1) The printing color sequence is arranged according to the transparency of the ink. The ink with a lower transparency is printed first, and the ink with a higher transparency is printed.
(2) Arrange the printing color sequence according to the area of ​​the printing plate. That is to say, the printing plate has a small ink area, and the printed image has a large ink color.
(3) Arrange the printing color sequence according to the viscosity of the ink. The ink with a large viscosity is printed first, and the ink with a small viscosity is printed, and the viscosity of the ink is lowered by color. If the color ink with high viscosity must be placed in the next color group, the viscosity should be reduced first with the de-adhesive. Otherwise, the overprinting failure will occur, that is, the ink mixing phenomenon will occur.
(4) Arrange the printing color sequence according to the characteristics of the original. For example, when printing originals such as warm colors and Caixia, the cyan should be placed in the previous color group, and the magenta should be placed in the back. If the originals such as glacier and snow are mainly printed in cool colors, the magenta should be placed. The former color group, the cyan is arranged behind.
In the above case, the cause of the failure is that the cyan ink is in the ground, the ink layer is thick, and the magenta ink is a light net, and the ink layer is thin. When the color sequence is reversed, the trouble is eliminated.
Case 2: Overprinting caused by the problem of peeling tension of the ink on the paper
When printing a full-scale sauce-colored beef sauce trademark (paper is 80g/m2 single-coated coated paper), the overprinting is always inaccurate, and the fourth color group blanket is continuously stuck and peeled, and the fangs are repeated. Cleaning and lubrication are still not solved.
Case study: For full-size large-volume prints, the viscosity and printing pressure of the ink should not be too large. Otherwise, if the paper is thin, the paper will be difficult to overcome the excessive printing peeling tension, resulting in inaccurate overprinting and paper curling. Even the tooth decay can not peel the paper from the blanket to complete the normal handover, so that the paper is continuously torn and peeled.
After the author has checked, first remove the viscosity of the black, magenta, and yellow inks with the de-adhesive agent, and then reduce the printing pressure of each color group as much as possible, and troubleshoot.
Case 3: The coloration effect of the ink is dark
There is a four-color bank passbook order, and the main color of the passbook cover is overprinted by 100% medium yellow and magenta. When the customer signs up on the machine, it is considered that the red color is slightly darker than the golden red and bright, which is far from the official printing. In the face of this situation, the author is very embarrassed.
Case study: It is undeniable that in the commonly used three primary color inks, different batches of inks tend to have a certain deviation in hue due to factors such as cost and price, such as reddish yellow, reddish magenta, and reddish blue. Overprinted colors, whether red or green, have lower color saturation and greater grayscale. At this time, we must analyze the original, grasp the most important color, choose the most suitable ink, and print the best results.
According to the change rule of ink color, the author decided to change the medium yellow used in the four-color ink to light yellow and the magenta to big red. When the first sample was printed, we found that the main color of the cover of the passbook had completely reached the golden red effect, the color was very bright, and the customer was very satisfied.
Case 4: "Ghosts" caused by ink
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