Digital BW, The Print

----- Original Message ----- 
From: "Peter Miles" <P.Miles@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Cc: <yahoo@...>; "Roy Harrington" <roy@...>
Sent: Monday, November 10, 2003 3:42 AM
Subject: [Digital BW] Vertical/Ripple banding with QTR 2


While we were looking at the print to see what it was I Turned
the print
over and we could see the same banding pattern on the back of the
print!  On
closer inspection we saw the print paper (Epson MHW) had *very*
small but
regularly spaced 30-35mm wide corrugations running down the
entire length of
the print. These corrugations are easier to feel than to see
directly.

The corrugations are confined to just the printed area.
They are also slightly deeper where the ink lay-down is heavier.
Print paper is definitely flat before it's printed.
I have checked all the other prints made with QTR 2 and found
they too have
corrugated the paper in the print area.

We found that the appearance of 'tonal banding' of the print
disappears when
the print paper is bent into a strong curve in such a way as to
flatten the
corrugations.


My guess is there something about the way ink is being laid down
by QTR 2
that\ufffds causing the paper to swell in a regular pattern.


Regards
Peter Miles


Peter,

Did you check whether the bands are the result of paper
inconsistencies ? Turn the paper 90 degrees before printing.
Usually paper or coating irregularities are only in one
direction.

Ernst