Injection Molding
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Uneven color when PVA is mixed with color masterbatch
Problem Phenomenon
PVA/color masterbatch injection molded products show color streaks and areas of uneven color depth
Cause Analysis
Color masterbatch carrier resin incompatible with PVA; poor color masterbatch dispersion with pigment agglomeration; unstable melt flow during '2079851475616104452 causes pigment orientation
Solution
1) Select PVA or same-type carrier color masterbatch to ensure compatibility; 2) Pre-disperse by twin-screw extrusion granulation; 3) Appropriately extend mixing time to ensure pigment dispersion; 4) Reduce injection speed to reduce pigment orientation
Key Takeaway
Color masterbatch carrier matching and full dispersion are the key to color uniformity
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