How to change color and clean printing ink

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How to change the color of printing ink and how to clean it

in the process of offset printing, especially the monochrome Offset printing machine, whether y, m, C, BK four-color printing, trademark, packaging and decoration, it is often necessary to wash the ink and change the color. Clean the ink delivery system of the entire offset printing machine, and then replace it with new ink. The ink scraper of the ink washing device is composed of a rubber knife, an ink receiving groove and an adjusting screw

ink washing process: pour gasoline and car washing water on the ink roller, install the ink scraper in the ink washing position slot, tighten the adjusting screw to make the rubber knife contact the surface of the inking roller corresponding to the offset press at an angle of 40, and the inking roller moves longitudinally and horizontally to continuously scrape the old ink and gasoline on the ink conveying system into the ink receiving slot through the rubber knife

the ink washing and color changing is clean and thorough, which plays a key role in accurately grasping the printing hue. Only by washing the ink can the printed matter have a correct hue, and the ink color is bright and accurate. In the actual process of ink washing and color changing, the following points should be paid attention to:

according to the description of the draft by Zhang Mao, President of the State Administration for Industry and Commerce

1 The ink scraper device for ink washing can only be installed on the offset press when the ink is washed and changed color, or when the ink roller needs to be cleaned due to other factors. During installation, the eccentric pin shafts at both ends of the ink receiving tank are placed in the open groove of the supporting shaft on the offset press wallboard to ensure that the polished damaged layer is removed repeatedly at a large polishing rate, and the adjusting nut is fixed in the opening of the square iron block on the wallboard. Then start the offset press and screw the adjusting nut to make the blade of the rubber knife slowly contact the surface of the inking roller. The contact pressure of the adjusting screws at the left and right ends is required to be uniform. The rubber knife is in uniform contact with each part of the inking roller, which can scrape the ink comprehensively

2. When cleaning the ink, in order to thoroughly and cleanly remove the ink accumulation and ink marks on all ink rollers, it is best to sprinkle gasoline on the ink roller near the ink bucket area from the upper part of the ink conveying part, so that the waste ink from the cleaning will flow into the ink receiving tank from the upper part of the rubber blade, and the ink roller can be cleaned after a period of cleaning

3. After the ink roller and ink bucket of the ink conveying parts are cleaned, wipe them clean, and clean them with a clean, soft, tidy cloth without fiber nap and with good water absorption performance

4. The installation position of the ink scraper of the cleaning and washing mechanism shall be accurate, and the rubber blade shall be kept at the same distance and the same contact pressure with the surface of the inking roller

5. After cleaning, wipe the cloth steadily and quickly. Do not let the cloth get involved in the ink roller without oil source when the offset press is running

6. The ink washing and color changing requires the operator to keep an even and appropriate amount of gasoline when pouring gasoline from the upper ink roller, and avoid splashing gasoline everywhere

7. Smoking and open fire are strictly prohibited in the workshop to prevent fire during ink washing and color changing

8. When the offset press is running, pay attention to the safety when wiping the ink roller

① be careful that the cuffs, hands and corners of the jacket are involved by the ink roller or roller, resulting in human injury

② it is forbidden for the operator to carry box ruler, key, coin, pencil, pen and other hard objects as well as ink shovel and repair machine tools in the pocket of his jacket and overalls to prevent them from falling into the ink roller and causing accidents

9. Generally, there are two situations for ink washing and color changing: one is to change light ink into dark ink, and the other is to change dark ink into light ink

① method of changing light ink into dark ink

it is easier to change light ink into dark ink, which saves time and effort for ink roller cleaning. First, use an ink shovel to shovel out the light color ink from the ink bucket. As long as you use an ink scraper to clean up the light color ink on the ink roller, and at the same time, clean up the ink skin, paper wool and other sundries left on the ink roller

② dark ink is replaced by light ink

offset ink is replaced with light ink, and

dark ink is replaced with light ink. At this time, the cleaning requirements for the ink roller are high, and it is difficult to clean the ink roller. It requires that the light ink should not be contaminated by the dark ink. If the old ink on the ink roller is not thoroughly cleaned, the color and hue will be inaccurate, and there will be the shadow of dark ink in the light ink. Therefore, it is necessary to clean the ink bucket After the ink rollers and ink shovels are cleaned, the ink shovels are used to apply the light color ink to the ink rollers, and the offset press is started to evenly stick the light color ink on the ink rollers, and then poured with gasoline for cleaning. If it is not clean, you can also repeat it until the ink roller is clean

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