Extrusion & Post
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PLA '2079851475616104452 Annealing Stress Relief
Problem Phenomenon
PLA products crack after storage, or break from stress release after assembly
Cause Analysis
PLA molding residual stress is released and cracks during storage and assembly; annealing treatment can eliminate stress and promote crystallization; annealing simultaneously improves heat resistance; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
①Annealing treatment after molding to relieve stress and promote crystallization; ②Annealing temperature set above the glass transition temperature; ③Slow cooling after annealing; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PLA annealing achieves three benefits at once: stress relief, crystallization promotion and heat resistance improvement; the standard post-treatment for precision and load-bearing parts; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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