Injection Molding
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EVOH and color masterbatch mixing with uneven color
Problem Phenomenon
EVOH/color masterbatch injection molded products show color streaks and areas of inconsistent color depth
Cause Analysis
Color masterbatch carrier resin incompatible with EVOH; poor color masterbatch dispersion with pigment agglomeration; unstable melt flow during '2079851475616104452 causing pigment orientation
Solution
1) Select EVOH or similar carrier color masterbatch to ensure compatibility; 2) Twin-screw extrusion pelletizing for pre-dispersion; 3) Appropriately extend mixing time to ensure pigment dispersion; 4) Reduce injection speed to reduce pigment orientation
Key Takeaway
Color masterbatch carrier matching and sufficient dispersion are the key to color uniformity
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