Common faults and countermeasures for solvent inks 1. Printing paper inks:
Pasting phenomenon: the ink on the printing plate is dry, and the printed pattern is unclear.
the reason:
â‘ Ink drying too fast â‘¡Ink viscosity is too large â‘¢Printing machine speed is too slow Countermeasures:
â‘ Add slow drying solvent â‘¡Reduce ink viscosity â‘¢Increase printing speed
Dirty, sticky phenomenon: the printed pattern is contaminated, or the cause of adhesion between printed products:
â‘ Ink drying is too slow â‘¡Ink viscosity is too large â‘¢Printer speed is too fast Countermeasures:
â‘ Improve the drying of ink â‘¡Reduce the viscosity of ink â‘¢Reduce the speed of the printing press
â‘ Poor control of ink viscosity â‘¡ Excessive printing pressure â‘¢ Uneven ink scraper Countermeasure:
â‘ Adjust the viscosity of the ink â‘¡Adjust the printing roller barrel â‘¢Replace the doctor blade
2. Water-based ink
Confused:
Phenomenon: The ink on the printing plate is dry, and the printing pattern is unclear.
the reason:
â‘ Ink drying is too fast â‘¡Ink viscosity is too large â‘¢Printing machine speed is too slow Countermeasures:
â‘ Add slow drying solvent â‘¡Reduce the viscosity of the ink â‘¢Improve the printing speed â‘£Adjust the printing pressure sticking and sticking phenomenon: the print pattern is contaminated, or the cause of the adhesion between the prints:
â‘ Ink drying is too slow â‘¡Ink viscosity is too large â‘¢Printing machine speed is too fast â‘£Overpressure countermeasures:
â‘ Increase the drying property of the ink â‘¡Reduce the viscosity of the ink â‘¢Reduce the speed of the printing press â‘£Finish the printing pressure defects and beards: The defects and beards appear on the edges of the printed products:
â‘ Poor control of ink viscosity â‘¡ Ink drying is too fast â‘¢ Countermeasures against too much pressure:
â‘ Adjust the viscosity of the ink â‘¡Reduce the dryness of the ink â‘¢Adjust the printing pressure bubble phenomenon: There are many bubbles in the ink tray Reason:
â‘ Caused by ink pump â‘¡ Air is mixed and air bubbles are brought in â‘¢ Countermeasures for poor ink quality:
â‘ Add defoamer â‘¡Replace ink 3.Phenomenon of compound packaging ink paste: The ink on the printing plate is dry, and the printing pattern is unclear.
the reason:
â‘ Ink drying too fast â‘¡Inappropriate printing machine speed â‘¢Countermeasures of excessive printing viscosity:
â‘ Add 3% -8% retarder â‘¡Adjust the printing speed â‘¢Adjust the proportion of diluted solvent Electrostatic phenomenon: There are beards, ink splashes, mist or round shapes on the printed products.
the reason:
â‘ Viscosity is too low, machine speed is too fast â‘¡Ink concentration is too large â‘¢Statistics on the influence of static electricity:
â‘ Increase the viscosity and reduce the machine speed â‘¡Decrease the concentration â‘¢Increase the static electricity preventive agent and isopropyl alcohol or ethanol Non-graphic phenomenon Phenomenon: The reason for the transfer to the printed matter through the squeegee:
â‘ The printing speed is too fast â‘¡The viscosity of the ink is too large â‘¢The countermeasures for the poor solubility of the ink:
â‘ Reduce the printing speed â‘¡Adjust the thinner ratio â‘¢Add a small amount of methyl ethyl ketone and toluene
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