How to save ink in the hottest small area printing

2022-08-26
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How to save ink in small area printing

there are one or several colors of pictures and texts in a larger page. The area of some printing [encyclopedia Weibo] is small, and these pictures and texts are often some trademark or iconic patterns or words, which have strict requirements for the accuracy of hue and the consistency of ink color. The amount of ink used in these small pages is almost zero. When printing, especially when printing with domestic monochrome or multicolor offset press, there will be many failures, mainly as follows

(1) because the ink volume of the layout is small, the ink bucket is almost completely closed, and the ink volume is too difficult to control. Generally, the ink volume is easy to be too large. If the ink bucket is adjusted for the distribution of wear of parts, it is easy to cause the ink volume to be too small after reducing the ink volume. This repeated adjustment of the ink bucket will lead to serious inconsistencies in the ink color of a batch of prints. Sometimes even for the same print, there will be great differences in the ink color of two or more identical graphics and texts

(2) due to the small amount of ink used in the layout and the high-speed operation of the machine, there must be dry rubber rollers at both ends of the ink roller, that is, dry rubber phenomenon

(3) the amount of ink used in the layout is small, so that there is almost no new ink in the ink path, but the experimental data and the average value of the experiment need to be continuously printed in the layout, so under the action of shear force, the ink is seriously emulsified, which is easy to make the layout dirty; In order to make the layout clean, we have to increase the amount of water, so as to increase the emulsification degree of the ink. In this way, a vicious cycle of repetition will be formed, and the ink color will be more difficult to control, which will also lead to the false impression of small color blocks, and even the phenomenon of sticking back

when undertaking the printing of a batch of wine packaging boxes, it is printed on white board with a format of 340mm 880mm and six colors. Most of the colors have a large area, and even have a full version of the field. The graphics and texts of the blue version are very small, with only a small number of dots and two trademark patterns about 4mm large. In order to avoid the above faults, change the paper format to 360mm 880mm, so that the blanking is still 3 Kai, and raw materials are not wasted. During plate making, a 30mm 880mm field color bar is printed outside the effective layout of the blue version, that is, the large part of the paper. In this way, although some ink is wasted during printing, the ink color is easy to control. Subtle changes in the ink volume of the layout can be clearly observed on the color bar, and ink emulsification is successfully avoided, so that the printing quality is guaranteed

in addition, some similar live parts were not added with color blocks during plate making, but we also succeeded in cutting the red film or red paper into strips with different specifications such as 20mm, 10mm or 5mm wide and pasting them on the outside of the effective plate of the film according to the size of the printed paper when drying the PS plate

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