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1. The back is dirty The main reason for the dirty back is that the amount of ink is too large, the powder is insufficient, and the powder is uneven. Solution: 1 adjust the printing state to the best, reduce the amount of ink if possible; 2 select the powder with the appropriate particle diameter and distribution density, usually the distribution density of the powder with a diameter of 20μm or more is 5-10 /mm2.
2. Paper delivery is not uniform
The reason for the paper being misaligned is that there is static electricity in the delivery section.
Solution: 1 put a carbon cloth on the delivery roller; 2 install a static elimination fan or an electrostatic bar in the delivery section; 3 install a humidifier, if there is a humidifier, enhance its humidification function; 4 install at the final transfer roller In addition to the static bar, and often clean the dust on the static bar, if it is aging, replace it in time.
3. Mopi
The ink is mainly caused by paper powder, crust impurities of the ink, and the like.
Solution: 1 When there is ink on the watermark version, the operator can directly scrape off, and the water-free silicone layer is very easy to be scratched. If you don't pay attention, there will be scratches, which will cause the whole version to be scrapped. Moreover, waterless offset printing can not use the water roller with the function of removing the ink. Therefore, in order to prevent the ink from reaching the printing plate, the deinking roller can be installed at the first inking roller; 2 replacing the rubber roller which adsorbs the ink difference ; 3 in the position of the plate of the printing plate to dry a strip, so that the ink is attached to the field strip; 4 non-graphic part plus the actual ribbon, but pay attention to the back of the dirty; 5 thoroughly clean the ink roller and ink fountain, replace the aging Ink roller; 6 using a waterless offset special de-skin tool.
4. Heap, the image is missing
The main reason for the lack of ink and graphic parts is that the waterless offset ink is too high or the surface strength of the paper is too low.
Solution: 1 select the waterless offset ink with low ink viscosity; 2 the temperature of the printing paper should not be too low, the paper should be sent to the printing workshop as early as possible to adjust the paper to the suitable temperature; 3 reduce the printing speed (the forced emergency) (4) Cleaning the blanket, just use the old paper that is not easy to cause the problem to evenly spread the ink when printing (the old paper should be reused many times, depending on the surface condition of the paper).
5. Bruise
The scratch is mainly caused by the tapping caused by the static electricity of the paper.
Solution: 1 Put anti-static tape on the paper-receiving roller to reduce static electricity caused by friction between the rollers and prevent the paper-receiving roller from sticking to the ink; 2 Install a static de-energizer on the paper-receiving roller.
6. Ghost
Ghosts are mainly caused by poor ink flow. For some special patterns, it is more difficult to completely remove ghosts.
Solution: 1 Add color blocks outside the graphic part to increase the fluidity of the ink; 2 Pay attention to the aging of the ink roller, confirm that the pressure of the ink roller is within the proper range; 3 Avoid the ink layer is too thick, the printing pressure and The plate layout temperature is adjusted to a suitable state; 4 When using imposition printing, if there is room for the printing layout, try to evenly distribute the position of the graphic; 5, if it is not dirty, allow a certain amount of movement of the ink roller.
7. Dirty
Dirty is caused by a decrease in ink viscosity caused by an increase in temperature of the printing press.
Solution: 1 When printing more than 10,000 pieces of work, the printing machine will continue to rise due to high-speed operation, and the surface of the printed sheet will gradually become dirty. In this case, the cooling unit can be lowered. Fix the temperature to eliminate the dirt. Of course, it takes some time. The temperature of the cooler can be set according to the long version and the short version. For example, when printing a long version, after printing thousands of sheets, you can follow the length. The temperature standard of the version of the workpiece reduces the temperature of the cooler, but this is not conducive to stabilize the temperature of the printing shop; 2 reduce the temperature of the printing machine , such as reducing the cooling temperature of the ink circulation part of the printing equipment , increasing the printing machine by increasing the number of fans, etc. The fluidity of the surrounding air reduces the heat retention of the printing press; 3 increases the air conditioning and cooling capacity; 4 reduces the printing speed (the emergency response measures).
8. Color difference
Colors printed on waterless offset printing are slightly different from those printed by water printing, and it is necessary to perform color matching. Solution: When using waterless offset printing for printing and printing, if the color of the printed and reprinted printing is inconsistent with the printing with water printing (there may be changes in the publishing curve of water printing), first confirm that there is The publishing curve of the water printing is then adjusted accordingly to the publication curve of the waterless offset printing (pre-made a number of waterless offset printing curves).
9. Poor surface smoothness
The poor smoothness in the field is mainly caused by the low pressure between the printing plate and the blanket cylinder, the high viscosity of the ink, the dryness of the ink on the printing machine, and the small pressure of the inking roller.
Solution: 1 Check if the pressure between the printing plate and the blanket cylinder is suitable; 2 Replace the smooth cloth; 3 Confirm the plate layout temperature, use the appropriate type of ink, set the appropriate cooling temperature; 4 Confirm the printing machine Whether the ink is dry or not, if necessary, clean the ink roller or spray the anti-drying agent. (Editor: Liu Yidong)
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