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Common offset printing ink failure causes and treatment methods

From the dirty

 

Phenomenon:  Generally refers to the non-image area gets dirty. Including the imprinted auxiliary, paste, outlets and even the phenomenon. However, from the dirty and can be divided into floating dirty and oil dirty two kinds. Are summarized as follows:

1, floating dirty

Phenomenon: in the non-image areas of light color gets dirty, not from printing and dyeing, so easy to erase.

Reasons :    (1) ink is quite soft part of the ink into the fountain solution emulsified in the formation of oil in water type emulsion by the role of fountain solution.

   (2) chemicals and wetting agents in the paper contribute to ink emulsification.

   (3) fountain solution containing soaps or detergents to cause the ink emulsion.

Approach:  (1) change with a high viscosity, and thick hard emulsion ink, or high viscosity in the original ink Mexican oil.

 (2) change the paper

 (3) adjust the dampening fluid components and PH.

 

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