Material Drying
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PA6 Storage Shelf Life
Problem Phenomenon
PA6 pellets stored for a long time still show silver streaks after drying, with low impact strength
Cause Analysis
PA6 pellets with damaged packaging or long-term storage continuously absorb moisture and may be accompanied by low-level oxidation; pellets with an excessively long moisture-absorption history, even if re-dried, have partially solidified molecular weight loss
Solution
①Store in sealed original packaging, first in first out; ②use up within a time limit after opening and record the exposure time; ③overdue stock material is re-dried and then doubly verified for moisture content and impact; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Storage management of PA6 pellets directly affects processability; sealing, first in first out, and exposure records are the three elements of raw material management; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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