Prior runs have contaminated
the plastication system |
Physically clean the entire system-hopper, barrel, shut-off valve, screw,
nozzle and mold.Purge the system with polyethylene
or polypropylene |
| Melt has insufficient color concentrate blending. |
Increase back pressure.
Increase barrel temp and reduce rear zone temperature.
Change screw speed.
Decrease nozzle orifice diameter.
Replace screw / nozzle with one that has
a mixing design.
|
