Injection Molding
1 views
Obvious surface color difference of PU
Problem Phenomenon
Different parts of PU products have varying color shades, 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) Use masterbatch method for color masterbatch 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
Was this helpful?
0 people found this helpful
Thank you for your feedback!