 | | SYMPTOM | | CAUSE | | REMEDY |
| | | | | | |
| | Color variation shot to shot. | | Poor OMNICOLOR preblending.
Pigment has insufficient thermal stability. | | More thorough blending.
Ensure correct machine temperature control |
| | | | | | |
| | Screw Slip. | | Premature melting of OMNICOLOR.
Excessive addition rate. | | Reduce heat in feed zone.
Check addition rate and reduce if necessary. |
| | | | | | |
| | Overall good distributive mixing with streaks or dots of another color. | | Poor pigment disbursion in concentrate. | | Return concentrate for replacement. |
| | | | | | |
| | Black streaks or spotches. | | Degraded polymer in barrel. | | Clean screw and barrel. |
| | | | | | |
| | Poor distributive mixing (Streaking). | | Insufficient plastification. | | See processing instructions. |
| | | | | | |
| | Loss of color. | | Pigment has insufficient thermal stability. | | Change to more heat stable concentrate.
Ensure correct machinetemperature control. |