Material Analysis
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PLA Regrind Blending
Problem Phenomenon
After blending PLA regrind, products become more brittle, the melt index rises, and the color darkens
Cause Analysis
PLA regrind thermal history reduces the molecular weight and raises the melt index; brittleness accumulates after multiple cycles; accelerated degradation crystallization conversely changes the shrinkage behavior; the color deepens with degradation
Solution
①Regrind ratio controlled within 20%; ②Melt index monitors the regrind degradation degree; ③Restrict regrind for load-bearing and appearance parts; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The value of PLA regrind decreases with thermal history; melt index monitoring is the quantitative ruler of regrind quality; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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