Category Archives: Paper Packaging

Fisheyes

Excessive defoamer added to the ink

Replace ink or add fresh ink without defoamer added

The defoamer added to the ink is incompatible

Replace ink or add fresh ink without defoamer added. Consult the local Sun Chemical Representative for recommended products or additives

Ink has excessive foam or microfoam

Eliminate foam or replace ink

Dirty Print – Fill In

Plate impression is excessive

Reduce plate to substrate impression

Plates are uneven, worn, cupped, glazed or mismatched (slugged)

Level, build up, clean, replace plates or entire mount

Printing plate is too soft

Use a higher durometer plate

Ink film applications are uneven due to press or plates that are not level

Adjust ink metering, print and anilox impressions, roll parallel or replace plates

Ink film too thick for plate and art design

Reduce ink film thickness by lowering ink viscosity, increasing ink metering effectiveness or decreasing anilox volume

Positive or reverse type are too small for ink film thickness/metering

Revise art, screens and plates for press capabilities

Paper dust collects in the press or ink and sticks to the plate

Clean press, plates and environment. Ensure clean, sharp slitting and sheeting

Ink drying too fast

Add glycol or increase press speed

Ink pH is too low

Check and adjust pH (non-pH stable inks only)

Dirty Print- Feathering

Excessive plate impression

Reduce plate to substrate impression

Printing plate too hard

Use plates with a softer durometer

Anilox to plate pressure is excessive

Adjust to reduce anilox impression. Check plate level

Plates are not level, worn, cupped, glazed or mismatched

Level, build up, clean or replace entire mount

Ink film is too thick

Reduce ink film thickness by lowering viscosity, increasing ink metering effectiveness or by decreasing anilox volume

Ink is drying too fast

Add glycol to slow drying or increase machine speed

Ink pH is too low

Check and adjust pH

Paper dust collects in ink or sticks to plate

Clean press, plates and environment. Insure clean sharp slitting and sheeting

Ink film applications are uneven due to press or uneven plates

Adjust ink metering, print and anilox impressions, roll parallel or replace plates

Ink pH is too low

Check and adjust pH (non-pH stable inks only)

Dirty Print – Dot Bridging

Anilox volume too high

Reduce anilox volume

Ratio of dot size (print size) to anilox cell count is inadequate

Revise art, screen and plates for press capabilities

Plate impression is excessive

Reduce plate to substrate impression

Anilox to plate pressure is excessive

Adjust to reduce anilox impression. Check plate level

Paper dust from board or pressroom collects in the ink and sticks to the plate

Clean press, plates and environment. Insure clean sharp slitting and sheeting

Ink film is too thick for plate screen

Reduce ink film thickness by lowering ink viscosity, increasing ink metering or decreasing anilox volume

Ink is drying too fast

Add slow solvent, increase machine speed

Printing plate is too soft

Use plates with a harder durometer

Worn plates

Replace plates

Ink pH is too low

Check and adjust pH (non-pH stable inks only)

Dark or Dirty Print Color

Ink viscosity too high

Lower ink viscosity

Ink colorant concentration too high for press or job configuration

Add extender to the ink. Reduce ink film thickness

Ink film too thick

Reduce ink film thickness by lowering ink viscosity, increasing ink metering effectiveness, decreasing machine speed or decreasing anilox volume

Ink contamination from prior color

Thoroughly clean press station and replace ink

Ink formulation is incorrect

Consult your Sun Chemical Representative

Poor Ink Coverage

Plate impression is insufficient

Increase plate to substrate impression

Ink film is too thin for substrate characteristics i.e. too rough or porous

Increase ink film thickness by:

  1. Raising ink viscosity
  2. Decreasing metering of anilox roll, increasing anilox roll volume or reformulating ink for substrate

Printing plate is too hard

Use plates with a softer durometer

Substrate surface resists ink wetting and lay

Consult with local Sun Chemical Representative for additives

Ink is drying too fast

Slow drying with glycol or increase machine speed

Ink pH is too low

Check and adjust pH (non-pH stable inks only)