Processing Machinery
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PMMA Storage Deformation
Problem Phenomenon
Sheets warp and deform after being stored for a period of time, especially large-size thin sheets
Cause Analysis
PMMA has a large thermal expansion coefficient and sheets have residual stress; improper storage support and temperature fluctuations accumulate deformation; unclamped sheets shrink at forming temperature
Solution
①Store sheets flat with uniform support; ②stable storage environment temperature; ③check flatness of large sheets before use and anneal when necessary; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PMMA sheet storage is flatness management; uniform support plus stable temperature prevents deformation before it happens; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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