Injection Molding
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General-purpose polyethylene injection molded products uneven color/color difference（Variant: Strengthened Measures）
Fenómeno do problema
Areas with inconsistent color depth appear on the product surface, or there is a color difference from the standard color sample.
Color difference may appear between different parts of the product, different cavities or different batches, affecting product appearance consistency.In particular, extra attention is needed on top of the original basis, this problem is more prominent and requires key attention.
Análise das causas
（1） Color masterbatch dispersion uneven, mixing time insufficient or mixing ratio unstable\
（2） Barrel temperature fluctuates greatly, color masterbatch coloring effect differs at different temperatures\
（3） Screw speed and back pressure set improperly, plasticization and mixing insufficient\
（4） Barrel or screw worn, dead zones produce discoloration or uneven coloring\
（5） Mold surface conditions inconsistent, gloss differences in different areas cause visual color difference\
（6） On top of the original basis, extra attention is needed: process parameter fluctuations or equipment status changes aggravate this problem
Solução
（1） Ensure the color masterbatch and raw material are fully mixed, mixing time 5-10min, use weighing equipment for accurate metering\
（2） Stabilize the barrel temperature, temperature difference of each section controlled within ±3°C （160-260°C range）\
（3） Appropriately increase back pressure to 5-10MPa, optimize screw speed to ensure uniform plasticization and mixing\
（4） Check screw and barrel wear, replace the screw tip or check ring if necessary\
（5） Regularly clean the mold cavities, ensure consistent surface conditions of all cavities\
（6） And strengthen process monitoring; on top of the original basis, extra attention is needed, paying special attention to parameter stability
Conclusão principal
Color difference is caused by uneven colorant dispersion or process parameter fluctuations, requiring consistency assurance from three aspects: mixing, plasticization and temperature control.Targeted preventive measures need to be taken in different production scenarios.
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