Injection Molding
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Obvious surface color difference of PU
Fenómeno del problema
Different parts of PU products have varying color shades, color difference ΔE>5
Análisis de la causa
Uneven dispersion of color masterbatch; pigment orientation during injection causing uneven color distribution; barrel temperature fluctuation causing color change
Solución
1) Use masterbatch method for color masterbatch to ensure uniform dispersion; 2) Reduce injection speed to reduce pigment orientation; 3) Stabilize barrel temperature ±2°C
Conclusión clave
Color difference is caused by uneven dispersion and orientation; masterbatch method and stable processing are key
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