Material Drying
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PA12 Hopper Re-humidification and Heat Preservation Management
Problem Phenomenon
【Problem phenomenon】Properly dried PA12 stayed in the machine hopper for several hours and the products showed silver streaks again
Cause Analysis
After drying, pellets in an open hopper are continuously exposed to workshop air and re-absorb moisture; EMS recommends using hopper heating or a hopper dryer when material stays in the hopper for a long time
Solution
Feed material in batches according to the cycle to control the material residence time in the hopper; activate the insulated drying hopper for long stays; in humid seasons, increase the frequency of silver streak visual inspection and moisture content sampling; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Passing drying only covers the present; hopper re-humidification management preserves the result; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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