MBM Corporation 352S - Manual (Page 51)

Operator's Manual multipli 35 Perforating - Scoring - Slitting
56 Mathias Bäuerle GmbH
Perforating Purpose of perforating:
• To avoid creasing when making crossfolds.
Air can escape from the folded sheet through the perforations.
Various perforating knives are available which differ in the type and number of teeth.
Their usage is determined by the type of paper and the kind of perforating job.
Thin paper: short cuts, many teeth
Heavy paper: long cuts, few teeth
There are two general types of perforations:
1.) Push-through:
Push-through perforations 9.100.231 and 9.100.232 run in the groove of a roller.
Make sure that the perforating knife runs exactly in the center of the groove of
its counterpart.
If the setting is not precise, this may lead to inaccurate perforations and premature
wear of the tools.
2.) Knife:
The counterpart of knife perforations 9.100.235, 9.100.236 and 9.100.237 is a
rotary knife.
Position the upper and lower tools so that they touch each other lightly like the
two knives of a pair of scissors.