Injection Molding
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Stress cracking of PLA injection molded products
Problem Phenomenon
The product cracks during storage or use.
Cause Analysis
The molding internal stress is too large (fast cooling), and the inherent brittleness of PLA is sensitive to stress concentration.
Solution
Raise the mold temperature to reduce the cooling rate; avoid sharp corners in product design; anneal at 60-80°C.
Key Takeaway
PLA stress cracking is related to its inherent brittleness.
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