People in the industry often say that the newly purchased printing machine at the beginning is very good for printing products, but after a long time, it has been found that the printing has whiteness and color difference, which seriously affects the quality of the product. In fact, the root cause of this problem may not be the device, but you have neglected the internal cleaning of the device!
Many printing presses have the phenomenon of flicking ink, but the operator only cares about flicking the ink without throwing it on the product, so where did the flicked ink go?
Anilox roller scratch
The accumulation of ink for a long time will form a strip, forming a hard block, reaching a certain thickness, and this ink residue will directly fall onto the anilox roller! When the hard block is relatively large, it will still be caught between the anilox roller and the rubber roller or the scraper. The friction will continue. The long-term friction will scratch the anilox roller, resulting in small line-shaped color aberrations when printing products. During maintenance, the machine cover must be fully opened for cleaning.
Clogged anilox roll
When the production of the printing press is finished, the ink on the baffle will flow to the anilox roller along the baffle without drying. At this time, the equipment has stopped and the ink will dry on the anilox roller after a period of time. Because the viscosity of the ink flowing down the baffle is relatively high, the situation of blocking the anilox roller will be more serious. When accumulating to form a large color block for a long time, you will find that there is always a color difference or dew.
In addition, due to ink problems, poor printing will also occur.
1. Poor hue (cannot lead to standard hue)
Reasons: Ink ink viscosity is too low, ink ink separation, precipitation, low ink amount, poor ink transfer
Solution: add original ink, keep stirring the ink tank, increase the amount of ink, check the roller and printing plate
2. Poor viscosity (cannot reach the specified viscosity)
Reasons: Shaking of water and ink, foam generation, solvent evaporation, and excessive water dilution
Solution: measure after circulating the ink, add defoamer, add special solvent, add original ink and thickener
3. Poor drying of the printed matter (too slow to dry)
Reasons: Ink viscosity is too high, ink stacking, poor ink drying, poor ink absorption, and paper splashing
Solution: dilute the ink, adjust the plate pressure and height difference, add quick-drying agent, and replace the paper with better ink absorption
Four, pile up ink
Reasons: uneven thickness of the printing plate, excessive pressure of the plate, high viscosity of the ink, and too much ink
Solution: Correct the height difference of the layout, reduce the plate pressure, add thinner, reduce the amount of ink
5. Produce burrs
Cause: The viscosity of the ink is too high, the drying speed of the ink is too fast, the plate pressure is too high, and the paper powder is mixed into it
Solution: reduce the viscosity of the ink, add slow drying agent, adjust the drying speed, reduce the plate pressure, and filter the ink with a filter.
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