1. Knife wire
Symptom: There is a thin pull line in the non-graphic part of the printed matter.
Cause: If the position of the cable is fixed, the printing plate is damaged; if the cable is swimming within a certain range and the number is fixed, the scraper is damaged and there is a gap; if there is no obvious pattern of the cable, there may be large impurities and ink residue.
Solution: Use 800-mesh sandpaper to polish the plate or replace the plate; polish the squeegee or replace the squeegee; check each guide roller to remove impurities and filter the ink in the circulating ink path.
2. Fog version
Trouble phenomenon: the large area of ​​the non-graphic part of the printed matter is colored.
Causes: The surface of the printing plate is rough; the blade of the scraper is not flat; the ink drying speed is too slow; the transferability of the ink is not suitable.
Solution: Polish the printing plate with the corresponding water sandpaper; polish the scraper or replace the new knife; add a quick-drying solvent to increase the ink drying speed and replace the appropriate ink.
3. Water mark, orange peel
Trouble phenomenon: The printed product has water-stripe orange peel (especially when printing in full-page).
Causes: slow printing speed; low ink viscosity; poor ink flow and poor leveling; poor flatness of the substrate (paper) surface.
Solution: increase printing speed; add new ink to increase ink viscosity; replace suitable ink; replace paper.
4. Hair loss, halo (ghosting), tailing
Trouble phenomenon: the printed image is not true, the fullness is poor, and the edge is doubled.
Cause: The pressure of the printing plate is not suitable; the platen roller is deformed; the angle of the scraper is not suitable; the viscosity of the ink is too low.
Solution: adjust the plate pressure; replace the platen roller; adjust the blade angle; add new ink to increase the viscosity of the ink.
5. Leaky white spots and false marks
Trouble phenomenon: Small lines and fine dots in the graphic parts of the printed matter, especially the high-profile parts, are missing.
Causes: The drying speed of the ink is too fast; the viscosity of the ink is too high; the ink transfer performance does not match; the pressure of the platen roller is too low; the platen roller is not flat; the angle of the scraper is not suitable; the paper surface is dusted or too rough;
Solution: Add slow-drying solvent to reduce drying speed; lower ink viscosity; use electrostatic ink absorption device; increase embossing pressure; replace new embossing roller; adjust scraper angle; replace paper; replace with new version.
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