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BQ 3.5 Rectangular Crease Lines
Description
Indentations or crease lines may appear in a
rectangular pattern in the center of the book.
Figure 3-4. Crease Lines on Cover
Possible Causes
The gripper has too much clamp pres-
sure for the stock being cut.
Solutions
Reduce the gripper clamp pressure
(ADJ 4.21 Gripper Clamp Pressure) until
crease lines disappear on test books.
3. Book Quality
BQ 3.6 Linear Crease Lines
Description
Indentations or crease lines may appear in a
rectangular pattern in the near the edges of the
book.
Figure 3-5. Linear Crease Lines
Possible Causes
The clamp has too much clamp pres-
sure for the stock being cut.
Solutions
Reduce the clamp pressure (ADJ 4.19
Clamp Pressure Adjustment) until
crease lines disappear on test books.
Note: Reducing the clamp pressure too much
will cause other quality problems such as draw.
Only reduce clamp pressure by necessary
amounts.
MAY 2019
3-4
BQ 3.7 Draw
Description
The cut face appears to have a slope because
all of the sheets are cut at different lengths.
Figure 3-6. Draw
Possible Causes
Clamp pressure may be too low.
The knife may be dull.
Solutions
Check clamp pressure. Clamp pressure
should be 40-90 PSI. Adjust if neces-
sary (ADJ 4.19 Clamp Pressure Adjust-
ment).
Replace the knife (REP 4.2 Knife Re-
placement).
CMT-130TC Book Trimmer
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