Injection Molding
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Uneven Color in PU Mixed with Color Masterbatch
Problem Phenomenon
PU/color masterbatch injection molded products show color streaks and areas of uneven color depth
Cause Analysis
Color masterbatch carrier resin incompatible with PU; color masterbatch dispersion poor, pigment agglomeration; melt flow unstable during '2079851475616104452 causing pigment orientation
Solution
1) Select PU or same-type 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 decrease pigment orientation
Key Takeaway
Color masterbatch carrier matching and full dispersion are the keys to color uniformity
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