Processing Machinery
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PMMA Environmental Stress Crazing
Problem Phenomenon
Fine crazing appears on products in storage without external force; environmental investigation finds large temperature and humidity fluctuations.
Cause Analysis
Residual stress is slowly released under temperature and humidity cycling, producing a crazing network on the surface; products with high stress levels are more prone to it.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solution
①Anneal to eliminate residual stress; ②control storage environment stability; ③avoid contact with solvent vapor; ④optimize process to lower the stress starting point.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Storage crazing is a delayed manifestation of residual stress; annealing and storage environment management are a preventive combination.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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