Molding Process
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Large EVOH Compression Set
Fenómeno del problema
EVOH product compression set >30%, failing the 15% requirement
Análisis de la causa
EVOH elastic recovery insufficient; crosslinking degree too low, plastic deformation unrecoverable; density too low, cell walls thin, recovery poor
Solución
1) Increase crosslinking degree to 60-70% to reduce plastic deformation; 2) Select high elastic recovery EVOH grade; 3) Add reinforcing filler
Conclusión clave
Large compression set is caused by insufficient crosslinking; increasing crosslinking degree is key
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