Injection Molding
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MP obvious surface color difference
Problem Phenomenon
MP products have varying color depth at different locations, color difference ΔE>5
Cause Analysis
color masterbatch unevenly dispersed; pigment orientation during injection causing uneven color distribution; barrel temperature fluctuation causing color change
Solution
1) color masterbatch masterbatch method to ensure uniform dispersion; 2) reduce injection speed to reduce pigment orientation; 3) stabilize barrel temperature ±2°C
Key Takeaway
color difference is caused by uneven dispersion and orientation; masterbatch method and stable processing are key
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