■ Comet/streak line changes with the oscillation of the doctor blade
■ Check for foreign particles under the doctor blade.
■ Clean the doctor blade.
■ Comet/streak line does not change position
■ Check the cylinder for any damage.
■ Lightly polish or replace the cylinder.
■ Random streak lines
■ Check the substrate for dust pick up during the press run.
■ Filter the ink for foreign particles/unground pigments
■ Ink is drying too slow
■ Use faster drying solvents
■ Decrease the printing speed.
■ Increase air flow and temperature of blower
■ Rewind pressure is too high
■ Decrease the rewind pressure
■ Over plasticized inks
■ Contact ink supplier.
■ Add anti-blocking compound.
■ Film is treated on both sides
■ Use one side treated film; or
■ Use anti-blocking compound.
■ Dust or foreign particles in the substrate
■ Check and clean the substrate
■ Change the substrate.
■ Foreign particles on the Impression cylinder
■ Check and clean the impression cylinder
■ Ink viscosity is too low
■ Add fresh ink to increase the viscosity
■ Increase machine speed
■ Too much pressure on impression cylinder
■ Adjust impression cylinder pressure
■ Ink viscosity is too high
■ Adjust ink viscosity
■ Decrease printing speed.
■ Ink is drying too fast
■ Add slow drying solvents
■ Increase printing speed.
■ Hot air coming to the nip
■ Reduce blower pressure
■ Minimize the hot air going to the nip.
■ Poor treatment of substrate
■ Treat substrate to appropriate treatment level
■ Improper ink for the substrate
■ Contact ink supplier and request for the right ink for the substrate.
Zarqa City – Jordan
P.O. Box: 392, Zarqa
13110-Jordan
Mob: +962 79 5008439
Mob: +962 79 0159649
Fax: +962 5 3650927
Email: info@empiink.com
cm@empiink.com