Material Analysis
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Long-term storage dimensional change of POE products
Fenómeno del problema
After 3 months of storage, POE product dimensions change by ±2-3%, exceeding the ±0.5% requirement
Análisis de la causa
POE physical aging relaxation causes continuous dimensional change; secondary crystallization slowly changes density and dimensions; slow migration of low-molecular substances changes local density
Solución
1) Anneal products at 80°C/4h before leaving the factory to stabilize dimensions; 2) Select high molecular weight grades to reduce low-molecular substances; 3) Slight crosslinking to reduce molecular chain mobility and suppress aging; 4) Control storage environment temperature at 23±2°C to reduce the influence of temperature changes
Conclusión clave
Dimensional change is caused by physical aging; annealing treatment and slight crosslinking are measures to stabilize dimensions
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