Solvent ink common faults and countermeasures

First, printing ink:
Paste version
Symptoms: The ink on the plate is dry and the pattern of the print is not clear. the reason:
â‘  â‘¡ excessive drying of the ink of the ink viscosity is too large â‘¢ press speed is too slow responses:
Slow-drying solvent is added â‘  â‘¡ â‘¢ lower the ink viscosity offset printing speed increases, blocking
Phenomenon: the pattern printed product is contaminated, or the reason adhesion between the printing products:
Too slow drying ink â‘  â‘¡ â‘¢ presses the ink viscosity is too large excessive speed Countermeasures:
â‘  â‘¡ improve ink drying property to reduce the viscosity of the ink â‘¢ reduction press speeds hair defects
Phenomenon: Friction on the edges of printed products :
1 poor control of ink viscosity 2 excessive printing pressure 3 ink scraper uneven
Countermeasures:
â‘  â‘¡ adjusting ink viscosity adjusting the platen roller barrel â‘¢ replace two doctor blade, water-based ink
Paste version:
Symptoms: The ink on the plate is dry and the pattern of the print is not clear. the reason:
â‘  â‘¡ excessive drying of the ink of the ink viscosity is too large â‘¢ press speed is too slow responses:
1 Add slow-drying solvent 2 Decrease viscosity of ink 3 Increase printing speed 4 Adjust printing pressure Stick dirty, stick together
Phenomenon: the pattern printed product is contaminated, or the reason adhesion between the printing products:
1The ink is drying too slowly 2The viscosity of the ink is too high 3The speed of the printing machine is too fast 4Pressing excess pressure Countermeasure:
1 Improve the dryness of the ink 2 Reduce the viscosity of the ink 3 Decrease the speed of the printing machine 4 Wither the printing pressure Frizz, beard
Phenomenon: Causes of hair blemishes and beards on the edges of prints :
â‘  â‘¡ poor control of ink viscosity ink dry too fast â‘¢ too much pressure responses:
1 Adjust the viscosity of the ink 2 Reduce the dryness of the ink 3 Adjust the printing pressure bubbles
Phenomenon: There are more bubbles in the ink tray :
1 Ink pump causes air to mix in with air bubbles 3 Ink quality is poor :
â‘  â‘¡ replacement ink defoamers added three composite packaging inks <br> paste version
Symptoms: The ink on the plate is dry and the pattern of the print is not clear. the reason:
â‘  â‘¡ press fast ink drying speed printing viscosity is too large â‘¢ Inappropriate responses:
1 Add 3%-8% of drying agent 2 Adjust the printing speed 3 Adjust the proportion of diluted solvent Static electricity
Phenomenon: There are whiskers, splashes of ink, fog, or round shapes on the prints. the reason:
1 The viscosity is too low, the speed is too fast 2 The ink density is too high 3 Electrostatic effects :
1 increase the viscosity, reduce the speed 2 reduce the concentration 3 increase antistatic agent and isopropanol or ethanol non-graphic phenomenon
Phenomenon: lose a spatula to transfer the cause print:
1 The printing speed is too fast 2 The ink viscosity is too high 3 The ink re-solubility is poor Countermeasure:
1 Decrease the printing speed 2 Adjust the diluent ratio 3 Add a small amount of butanone and toluene


Source: 21st Century Fine Chemicals Network