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1.2 Perforating
The folder may be used for perforating either the heads of booklets (to allow the air to escape in making right-angle folds)
or to slot perforate sheets delivered flat, using blades and strippers best adapted for a particular job.
All perforating blades are mounted on the upper shaft and run a side of the steel collar on the lower shaft with the flat side
of the blade just touching the anvil. When doing book work, perforator blades should be mounted with the bevel side of the
blade toward the following bank of fold rollers, the direction the signature will be travelling. (See Figure 31). When mounted in
this manner there is slightly less tendency for the sections of the signature to come apart and less tendency for one section to
pull out of line with another. This is particularly true when folding in an up fold plate.
A stripper must be used with each perforation. The forked spring steel stripper requires a little more care in mounting and is
most often used when perforating only, as there is less tendency for the perforated sheet to break apart.
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TP10243-3
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