Material Analysis
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PA6 Regrind Control
Problem Phenomenon
After blending regrind, product strength decreases, appearance black specks increase, and batch differences are large
Cause Analysis
PA6 regrind decreases in molecular weight after experiencing thermal history, and performance cumulatively deteriorates after multiple cycles; regrind of unknown origin may also be mixed with other polymers and contaminants
Solution
①Control the regrind ratio within 20% and dry it separately; ②test melt index and impact strength by batch; ③restrict regrind use in load-bearing and appearance parts; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
The value of PA6 regrind decreases with thermal history; ratio limitation, batch testing, and application grading are the three disciplines of regrind use; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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