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2-Color Offset 4+ Color Offset Direct Imaging Digital Press Color Copiers Finishing Inkjet & Fine Art
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  #1  
Old 08-15-2008, 10:25 AM
djicewolf djicewolf is offline
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Join Date: May 2008
Location: Moose Jaw, Saskatchwan, Canada
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Heidelberg DI Press Colour changing on sheets every 4th or 5th sheet

We are running a full size sheet with pattern screen and about every 4th or 5th sheet the ink colour changes for about 2 sheets and then prints correctly. I wonder if this is build up of ink on the blanket not transfering properly or the ink tack not correct. Also we just replace the ink rollers, so perhaps we should recalibrate the rip as the rollers may be carring more ink now.

Would appreciate any suggestions

Thanks
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  #2  
Old 08-15-2008, 04:48 PM
whatayanuts whatayanuts is offline
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Join Date: Jul 2008
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a couple of suggestions
sheet distortion.
make sure your in feed brushes on the feeder are down far enough to keep the sheet from flapping around. the feeder set up air/vacuum has alot to do with blended screens to make solids. ink ductor on full coverage should have at least twice as much movement then what usually comes up on your ink profile. you can always close the keys more. but some screen will do that on this press. the form rollers are small and it doesnt recover fast enough with full coverage.
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  #3  
Old 08-15-2008, 05:21 PM
mrheidelberg mrheidelberg is offline
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Join Date: Jan 2008
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Hi,

The impression cylinder grippers may need cleaning or adjusting, that may be the issue. Because there are 4 sets of grippers if 1 set is not maybe set correctly this will present the sheet in a different position thus giving a different colour on the sheet, and then it will clean up then do it again.

Regards.

Regards.
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  #4  
Old 10-27-2008, 03:01 PM
AllRush AllRush is offline
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Default curious

Just out of curiosity is the colour a green?
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  #5  
Old 11-05-2008, 01:14 AM
5150pressman 5150pressman is offline
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Could the grain direction of the paper be giving you a problem? Paper is fanning out?
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