Material Drying
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PA12 Bag-opening Temperature Difference Condensation Moisture Absorption
Problem Phenomenon
【Problem phenomenon】In winter, PA12 taken out of a low-temperature warehouse soon showed processing silver streaks after opening the bag, but the drying records showed no abnormality
Cause Analysis
When the temperature difference between the storage area and the processing area is large, condensation forms on the surface of cold material after opening the bag and absorbs moisture; the EMS manual requires that when the temperature difference is large, the material should be placed at room temperature in the processing area for 24 hours before opening the bag to prevent condensation moisture absorption
Solution
Move low-temperature stored material into the processing area 24 hours in advance to equalize temperature before opening the bag; arrange the bag-opening timing just before feeding; use an insulated hopper when workshop humidity is high
Key Takeaway
Equalize cold material for 24 hours before opening the bag; condensation moisture absorption is an invisible source of silver streaks; 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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