How can clouding of colored extrudates be avoided?

This fault points to various causes:

1. Residence time in extruder too long

Remedy:
Avoid flow restiction, particularly in the vent zone

2. Inadequate distribution of colorant

Remedy:
Revise formulation, install static mixer

3. Contamination (e.g. by other plastics)

Remedy:
Clean unit, possibly clean drier and conveyors, avoid flow restriction

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