Injection Molding
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Obvious PVA surface color difference
Problem Phenomenon
PVA product color depth varies at different locations, color difference ΔE>5
Cause Analysis
Uneven dispersion of color masterbatch; 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 the key
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