Material Drying
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PMMA Product Dimensional Stability
Fenómeno do problema
Dimensional drift of precision optical parts.
Análise das causas
PMMA shrinkage of 0.2%~0.8% is relatively low, but moisture absorption and stress relaxation still have an impact; measurement environment is not unified.
Solução
①Unify measurement environment and aging; ②sufficient cooling; ③annealing stabilization.
Conclusão principal
Precision parts = measurement standardization.
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