Material Drying
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PLA Edge Trim Recycling Difficulty
Problem Phenomenon
PLA sheet edge trim performance drops sharply after recycling, and large amounts of trim can only circulate at low prices
Cause Analysis
PLA edge trim recycling is difficult without suitable crystallization equipment; thermal history and hydrolysis reduce the molecular weight of the recycled material; the large amounts of PLA trim circulating at low prices in the market stem precisely from this
Solution
①Re-crystallize and dry edge trim before recycling; ②Limit the recycling ratio and monitor the melt index; ③Restrict recycled material use in high-value products; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The bottleneck of PLA edge trim recycling lies in crystallization and thermal history; molecular weight monitoring of recycled material is the prerequisite for reuse; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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