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6.If mottling, how to solve it?

6.If mottling, how to solve it?

Sep 21, 2024
Problem Possible Cause Solution
Mottling Too much water supply,excessive emulsification of ink. Reduce water supply. Adjust water / ink balance.
The former set of rolling cylinde has excessive water supply leading to paper transfer with excessive water. Reduce water supply of former set of roller cylinder.
Paper not strong or coating too weak. Use suitable quantity of tack reducing agent to decrease tack of  ink.
Blamket rolling cylinder has too much pressure on paper. Reduce printing pressure to machine supplier's specification.
Blanket too hard. Change to blanket with softer nature.
Too high color density of ink leading to inadequate supply of ink being transferred to plate. Add ink reducer to reduce color density of ink.

 

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