Extrusion & Post
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PMMA Annealing Specification
Problem Phenomenon
Cracks appear in PMMA products after storage, and stress testing exceeds the standard
Cause Analysis
Molding internal stress not eliminated is slowly released during storage and induces cracks; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Anneal products at 70-90℃ for 2-4 hours with slow cooling in the furnace; extend annealing time for thick-wall parts; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Annealing is the standard post-treatment for PMMA to eliminate internal stress; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.; include this case in the defect archive as a troubleshooting reference for similar future problems.
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