11/09
CMT 130 Book Trimmer
5-3
Rectangular Crease Lines
5.4 Rectangular Crease Lines
Description
Indentations or crease lines may appear in a
rectangular pattern in the center of the book.
Figure 5-4. 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 by
turning the control dial counterclock-
wise. Reduce the pressure until crease
lines disappear on test books. The
gripper adjustment gauge only reads
gripper pressure while the gripper is
holding the book.
5.5 Linear Crease Lines
Description
Indentations or crease lines may appear in a
rectangular pattern in the near the edges of the
book.
Figure 5-5. Linear Crease Lines
Possible Causes
•
The clamps have too much clamp pres-
sure for the stock being cut.
Solutions
•
Reduce the clamp pressure by turning
the control dial counterclockwise. Re-
duce the pressure until crease lines dis-
appear on test books.
•
Worn cut plates may create these lines
on the bottom cover. Turn or change
the cut plates.
Note: Reducing the clamp pressure too much will cause
other quality problems such as draw. Only reduce clamp
pressure by necessary amounts.
5.6 Draw
Description
The cut face appears to have a slope because
all of the sheets are cut at different lengths.
Figure 5-6. Draw
Possible Causes
•
Clamp pressure may be too low.
•
The knife may be dull.
Solutions
•
Check clamp pressure. Clamp pres-
sure should be 80-90 PSI.
•
Replace the knife. Rotate or replace
the cut stick.