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Author Topic: Decurling before printing  (Read 1688 times)

Wayne Fox

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Decurling before printing
« on: January 11, 2009, 10:36:36 PM »

It seems that all of the sheet papers I'm trying lately are not flat enough to get through my printer without problems, except for EEF.  Both the Hahnemühle FAB and the Harmon Gloss FB AL have just a little curl at both ends, and even with the 7900 and 11880 suction maxed, it curls enough to miss the bottom exit guide and jam.  The head hits the edge just enough to leave a ink smudge.  Trailing edge also a problem.

My only thought is to try and de-curl the ends with my d-roller, not sure if this would damage the surface.  Anyone else having this problem that has found a solution?
« Last Edit: January 11, 2009, 10:37:00 PM by Wayne Fox »
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Ernst Dinkla

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Decurling before printing
« Reply #1 on: January 12, 2009, 03:20:02 AM »

Quote from: Wayne Fox
It seems that all of the sheet papers I'm trying lately are not flat enough to get through my printer without problems, except for EEF.  Both the Hahnemühle FAB and the Harmon Gloss FB AL have just a little curl at both ends, and even with the 7900 and 11880 suction maxed, it curls enough to miss the bottom exit guide and jam.  The head hits the edge just enough to leave a ink smudge.  Trailing edge also a problem.

My only thought is to try and de-curl the ends with my d-roller, not sure if this would damage the surface.  Anyone else having this problem that has found a solution?

Very little decurling is often just enough, so make a semi D-curler with a 2 or 3 inch core and a sheet of paper. Sheets with an inward curl are quite common in the drier winter (indoor) climate, they also become less flexible for the same reason. So cracking of the coating remains a risk, more so if the coating is bended outwards instead of inwards which is what you do when prints come off a roll.


Ernst Dinkla

Try: http://groups.yahoo.com/group/Wide_Inkjet_Printers/
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neil snape

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Decurling before printing
« Reply #2 on: January 12, 2009, 09:13:45 AM »

I replied to another post by someone else on this problem. As Ernst notes the humidity often determines how much curl is there or not.
Unfortunately the papers you list have edge curl which is hard to remove in de-rolling.
IF you reduce platen gap you risk more head strikes at the curly edge, but increasing the platen gap allows the curly edge to release even farther from the suction base.
I do know the Hahenemuhle PhotoRag Baryta has a lot less or no edge curl, less memory than HFA B or Harman.
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