I agree, you can check the variation by using pressure sensitive paper.
Others things worth checking are:
1. excessive wear / backlash in the drive between upper / lower rollers
(either chain or gears).
2. nicks / cuts in the rollers (operators with scalpels!)
Martin C
===== Original Message from [log in to unmask] (TechNet E-Mail Forum.) at
26/09/00 19:33
>A pressure variation from one end of the roller to the other would be my
>guess.
>Just had the same problem. Found one of the idler gears in the machine had
>spit out a key and was slightly out of alignment, which was causing the
>roller to apply uneven pressure across the panel.
>
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