Service Manual 10 Cutting Quality Enhancement Tips
10.1 Trouble occurring/cutting problems and their remedies
1/09 PERFECTA 115 / 132 / 168 / 225 – TS 64
PERFECTA Schneidemaschinenwerk GmbH D-02625 Bautzen Schäfferstr. 44 Tel.: +49-3591-556-131 to -133 Fax: +49 3591-556-139
10.1.3 Undercutting
Undercutting occurs when the lower sheets are shorter than the upper ones after
cutting.
Figure 45: Undercutting.
Cause Remedy
The clamp pressure is too low:
The lower sheets are forced outward
during cutting.
Increase the clamp pressure.
The cutting edge angle is too big. Reduce the cutting edge angle.
Raw or uneven material:
e. g. gummed labels or embossed
prints.
Adapt the clamp pressure.
The cutting path is not vertical. Correct the cutting path.
Table 7: Causes of and remedies to undercutting.
10.1.4 Concave cutting
The paper sheets are longer at their ends than in the middle.
Cause Remedy
At its ends, the pile is pressed down
stronger than in the middle.
Check the clamp edges and place a felt or
foam pad underneath, if necessary, to
distribute the pressure more uniformly.
Wet material is used for processing
reasons (containing tension).
After you obtain a concave cut, make a
second cut.
Table 8: Causes of and remedies to concave cutting.
Knife
Clamp
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