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 laterally to scrape the old ink and gasoline on the ink conveying system into the ink receiving slot through the rubber knife.How To Wash Ink And Change Color

      Clean and thorough ink washing and color change play a key role in accurately grasping the printing hue. Only through ink washing can the printed products have positive hue, bright and accurate ink color. In the actual operation of ink washing and color change, pay attention to the following points:How To Wash Ink And Change Color

      The ink scraper device for ink washing can only be installed on the offset press when the ink is washed and changed, 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 shall be placed in the open groove of the support shaft fixed on the wall panel of the offset press, and the adjusting nut shall be fixed in the opening of the square iron block on the wall panel. How To Wash Ink And Change Color

      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.How To Wash Ink And Change Color

       During ink cleaning, in order to completely 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 cleaning flows into the ink receiving tank from the upper part of the rubber knife edge, and the ink roller can be cleaned after a period of cleaning.How To Wash Ink And Change Color

      After the ink roller and ink bucket of ink conveying parts are cleaned, wipe them, and clean them with a clean, soft, neat cloth head without fiber lint and good water absorption performance.How To Wash Ink And Change Color

      The installation position of the ink scraper of the cleaning and washing mechanism shall be accurate, and the rubber blade and the surface of the inking roller shall be kept at the same distance and the same contact pressure.How To Wash Ink And Change Color

       After cleaning, take the cloth stably and wipe quickly. Do not let the cloth get involved in the ink roller when the offset press is running.How To Wash Ink And Change Color

     Ink washing and color changing requires the operator to keep a uniform amount of gasoline when pouring gasoline from the upper ink roller, and do not splash gasoline everywhere.How To Wash Ink And Change Color

7. Smoking and open fire are strictly prohibited in the workshop to prevent fire during ink washing and color change.How To Wash Ink And Change Color

8. When the offset press is running, pay attention to safety when scrubbing the ink roller.How To Wash Ink And Change Color

① Be careful that the cuffs, hands and corners of the coat are entangled by the ink roller or roller, resulting in human injury.How To Wash Ink And Change Color

② It is forbidden to carry box ruler, key, coin, pencil, pen and other hard objects, ink shovel and repair machine tools in the pocket of the operator’s coat and overalls, so as to prevent them from falling into the ink roller and causing accidents.How To Wash Ink And Change Color

     Generally, there are two situations for ink washing and color change: one is to change light ink into dark ink, and the other is to change dark ink into light ink.How To Wash Ink And Change Color

① Method for changing light ink into dark ink

It is easier to replace light ink with 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 clean the light color ink on the ink roller with an ink scraper, and clean the ink skin, paper wool and other sundries left on the ink roller at the same time.How To Wash Ink And Change Color

② Replace dark ink with light ink

       For offset printing, the ink is washed and the color is changed, and the dark ink is replaced with light ink. At this time, the cleaning requirements for the ink roller are high, so it is difficult to clean the ink roller. It requires that the light ink can not be dirty by the dark ink. If the old ink on the ink roller is not completely cleaned, the color and hue will be inaccurate, and there will be the shadow of dark ink in the light ink.How To Wash Ink And Change Color

       Therefore, the ink bucket Wash the ink roller and ink shovel, then apply the light color ink to the ink roller with the ink shovel, start the offset press, make the light color ink stick evenly on the ink roller, and then pour gasoline to clean it. If it is not clean, you can also repeat it until the ink roller is clean .How To Wash Ink And Change Color