Material Drying
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ASA hopper heat preservation anti-moisture regain
Problem Phenomenon
[Problem phenomenon] Dried qualified ASA has silver streak recurrence after staying in the machine hopper, more obvious at night shift
Cause Analysis
Dried material in an open hopper continuously exposed to workshop air reabsorbs moisture; night shift ambient humidity rises accelerating moisture regain, risk exists when staying over 2-3 hours; during on-site investigation, verify item by item according to this mechanism, avoid blindly adjusting the machine based on experience alone
Solution
Hopper equipped with heat preservation drying device to maintain dry state; batch feeding according to cycle to control residence; cover the hopper and shorten exposure in humid seasons; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
ASA hopper moisture regain is the main cause of night shift silver streaks, heat preservation and batch feeding respond; 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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