Special Perforating Knife (Option); Cutting; Scoring - MBO B21 Original Manual

5.2

Special perforating knife (Option)

We are dealing here with a non-slotted,
V-shaped and two-side grinded
perforating knife of 0,06" thickness.
This special perforating knife is employed
on the knive shafts at folding unit I of
buckle folding machines.
During perforation the sheet is also
pre-scored.
This resultsin the dog ears at head side
of cross-fold-unit (8-page-unit) being
avoided.
There are two possiblities of installation:
1st between the scoring edges and
2nd between the slitter edges
In any case, the slitter respectively scoring rollers shall not touch the perforating knives. Distance
and method of installation should be adjusted to the product to be processed. It should be
considered that the cut of the perforation is not as clear as usual, because the perforating knife
does not touch the counter knives.
5.3

Cutting

Instead or in addition to a perforating knife you may use a cutting knife (mainly for cutting when
running multiple production). Installation occurs in the same way.
5.4

Scoring

A score should be made before a buckle
fold. If this score has not been made it is
not guaranteed that you obtain the fold in
the desired place. Normally you should
score with one scoring knife 1 which is
placed between two control rollers or two
counter knives 2 placed at the round
side.
Alternatively, you may also score on the
rubber part of the control roller 3.
However, a scoring knife with a smaller
external diameter must be used. Special
scoring devices may also be used upon
request.
Alterations reserved
Operating Manual
2
Page 75
1. Option
Perforating
knife
Paper
Slitter rollers
1
2
3
B21-C - en
2. Option
Version 05/2008