Processing Machinery
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ASA color masterbatch dispersion
Problem Phenomenon
[Problem phenomenon] ASA natural color material colored with color masterbatch, uneven hue and batch color difference fluctuation
Cause Analysis
Major manufacturers recommend buying natural color ASA with UV-stable color masterbatch mixed at the machine side, cheaper than pre-colored material but requires precise process control; poor masterbatch dispersion causes color mottling; during on-site investigation, verify item by item according to this mechanism, avoid blindly adjusting the machine based on experience alone
Solution
Color masterbatch select UV-stable type and precisely metered by ratio; screw mixing section ensures dispersion; ratio locked after first article color matching; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
ASA machine-side coloring saves cost, masterbatch dispersion and ratio are key; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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