Image area not picking ink

[saravinfo10]

Some part of the image in the plates are not picking ink in the off set machine. What will be the reason..

 

[D Ink Man]

Chemistry problem somewhere in your process. Either pre-press or at/on press. Check the Offset Printing Variables chart for clues. I believe Gordo posted it in in the past; I cannot put my finger on it. Maybe he can provide it again.

D

 

[Alois Senefelder]

Hello Saravinfo10,

From reading many of your posts, they all relate to a " Poor Understanding of Lithographic Platemaking" and this impacts onto poor "Press Performance"

while many of the problems you encounter are....... answered by the members of this forum, you need Trained Staff !!


Causes of Plate Failure:

1) Too much Ink 2) Too much Roller Pressure 3) Too much Impression Pressure

4) Too High a Blanket 5) Fountain Chemistry and poor Plate Making Techniques !


Plate Failure: 1) Scumming 2) Plate Blinding


Also post Photos of the Plate Problem !!


Regards, Alois

 

[D Ink Man]

Here it is.

 

[gordo]

Some part of the image in the plates are not picking ink in the off set machine. What will be the reason..

How large is the image that’s not picking up ink vs the surrounding non-image area?

 

[CSF]

Calcium contamination is a major cause of plate blinding. The problem is rampant.

 

[Alois Senefelder]

Hello saravinfo10,



Also Check the Press Inker Roller settings


Regards, Alois