Injection Molding
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Obvious EVOH Surface Color Difference
Problem Phenomenon
Different parts of EVOH products vary in color depth, color difference ΔE>5
Cause Analysis
Color masterbatch dispersion uneven; pigment orientation during injection causing uneven color distribution; barrel temperature fluctuation causing color change
Solution
1) Masterbatch method to ensure uniform dispersion; 2) Reduce injection speed to decrease 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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