APR 2018
CMT-330TC Three-Knife Trimmer
5-2
5. Book Quality
5.1 Burr Marks
Description
Burr marks are found on books trimmed with a
knife that has a burred cutting edge. Figure 5-1
illustrates the appearance of burr marks.
Figure 5-1. Burr Marks
Possible Causes
Burrs on knives can occur from im-
proper knife handling.
Burrs may also occur from cutting hard,
irregular materials, or books with sta-
ples.
Solutions
Replace the knives (see Section 4.5
Knife Change).
5.2 Jagged Bottom Cover
Description
Books can appear as though the bottom few
sheets and cover were torn apart rather than
sharply cut. Tearing of the bottom sheets and
cover occur when deep score marks develop in
the cut stick. The cover is pushed into the score
mark, folded over and torn.
Figure 5-2. Jagged Cover
Possible Causes
The cut plates and/or stick may be worn.
The knives may be dull.
Solutions
Rotate or replace the cut plates and/or
cut stick (see Section 4.3 Cut Plates
and/or 4.4 Cut Stick).
Replace the knives (see Section 4.5
Knife Change).
5.3 Burr Marks/Jagged Cover
Description
A jagged bottom cover may also accompany
burr marks. A burred knife may not fully cut into
the cut stick. As a result, it will leave a jagged
bottom cover.
Figure 5-3. Burr Marks/Jagged Cover
Possible Causes
A knife is burred, and the cut plates
and/or cut stick is worn.
Solutions
Rotate or replace the cut plates and/or
cut stick (see Section 4.3 Cut Plates
and/or 4.4 Cut Stick).
Replace the knives (see Section 4.5
Knife Change).
Summary of Contents for CMT-330TC
Page 4: ...APR 2018 CMT 330TC Three Knife Trimmer iv Introduction Notes...
Page 28: ...APR 2018 CMT 330TC Three Knife Trimmer 1 24 1 Introduction NOTES...
Page 60: ...APR 2018 CMT 330TC Three Knife Trimmer 3 12 3 Operator s Guide NOTES...
Page 72: ...APR 2018 CMT 330TC Three Knife Trimmer 4 12 4 Routine Tasks NOTES...
