Abstract

Piling is an unwanted effect, where the pigments of the ink build-up negatively on the blankets. Serious print-quality-issues, as well as early blanked wear, follow.

 

Suspect 1 – Ink/Fountain-additive incompatible

In most cases, the fountain additive is not working well with the ink in use. Chemical interactions between the printing plate and the fountain additives make the plate accept lesser water. Micro-Toning effects make pigments separate from the ink’s binder and build upon the blankets around image-areas.

Redeem:

  1. Check the fountain solution
  2. Find proper additives for inkset
  3. Adjust additive concentration accordingly to manufacturers recommendation 
  4. Check and optimize blanket cylinder packing
  5. Try a different set of ink

 

Suspect 2 –  excessive cylinder pressure

Excessive pressure may separate inks binder and pigment. This is only true for low quality inksets.  

Redeem:

  1. Reduce pressure between the plate cylinder and blanket cylinder
  2. Use higher quality inkset

 

Suspect 3 –  Ink over-emulsified

Especially UV-curing inks are sensitive to over-emulsification. Too much water merged with the ink may alter the inks probabilities to transfer correctly.

Redeem:

  1. Reduce dampening level
  2. Mechanically adjust dampening system
  3. Clean dampening system
  4. Decalcify rollers of the ink train

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Framing

Picture Framing. An printing issue were ink is getting transferred over non-printing area

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How to address leaking/slinging coating units in industrial printing machinery.

Ink Misting

Ink misting. Dirty printing presses caused by Ink-Aerosoles.

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Abstract: While drying, conventional offset inks dry by evaporating volatile components (solvents) into the...

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How to address blocking piles after press delivery (Offset)

Coating Chamber Leaking

How to address leaking/slinging coating units in industrial printing machinery.

Streaking (Offset)

Streaks in print are color density fluctuations or contrast variations, usually perpendicular to the print direction.

Framing

Picture Framing. An printing issue were ink is getting transferred over non-printing area

Ink Misting

Ink misting. Dirty printing presses caused by Ink-Aerosoles.

Piling

  Abstract Piling is an unwanted effect, where the pigments of the ink build-up negatively on the blankets. Serious...