User guide

Troubleshooting l 6-11
6
Troubleshooting
Product Quality Problems (continued)
Symptom
Hairs or strings.
Possible Cause
Blade speed is too low.
The blade is too thick.
The blade is wrong for the applica-
tion.
Material is building up on the blade
and wiping off on the cut site.
There are imperfections on the
blade.
A hole or slot in the blade cut path
is causing a ‘cheese grater’ effect.
The extrudate is too cold.
Solution
Increase the blade speed or decrease
the blade cut path area (blade
width).
Excessive blade thickness can cause
frictional heat. Use a thinner blade.
Change angle of the blade attack or
the blade style to decrease the cut
path area.
Use blade lubrication (water, etc.) or
change lubricants.
See Appendix D.
Consider a blade wiping system.
The cutting edge should not have
grind marks, burrs or other imper-
fections. Check the blade and
replace if necessary.
Change to a different blade design.
See Appendix B.
If the extrudate is too cold, it can
fracture during cutting. Raise the
extrudate's temperature.