Matte Paper Scratched During Folding
The surface of matte finish paper shows scratches after folding.
Cause
When the folded paper is transported to the fold crease unit, the leading edge (creased edge) enters the fold nip prepared level for the press guide [B], and then is pressed by the on the paper transport guide. The press guide is provided with three press rollers [A]. The friction between the press guide and press guide plate as the paper is fed can scratch or mark the matte finish of the paper.
The surface of the guide plate is rough and can cause marks on the surface of the paper. The surface of the plate becomes smoother after about 2,000 sheets have feed through the folding unit and these marks disappear.
The surface of gloss coated paper is much smoother, so these marks do not appear on glossy paper.
The surface of Normal paper is untreated, so these marks do not appear with Normal paper.
Solution:
Open the guide plate and clean the metal plate at [A] with an alcohol dampened cloth.
Print and fold a sample. Is the problem resolved?
Yes: Finished!
No: Go to the next step.
Take a piece of paper and gently rub the surface of the metal plate to smooth it, and then do another test. Is the problem solved?
Yes: Finished!
No: Repeat Steps 1 and 2. If the problem persists, consult key operators.
Cleaning the surface of the metal guide plate and buffing it with a piece of paper reduces the occurrence of marks on the paper.
The present condition of the guide plate at the affected area depends on the amount of usage of the folding unit, but buffing the surface of the plate with paper 20 to 50 times should reduce friction during paper feed.
After buffing the with paper, always clean the surface of the plate with a clean cloth dampened with alcohol to remove tiny bits of paper that could adhere to the plate after buffing.
