Molds & Tooling
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EVA Foaming Shrinkage Deformation
Fenómeno del problema
Foamed shoe soles shrink greatly after demolding, and the dimensions are unstable.
Análisis de la causa
Insufficient crosslinking density makes the foam support weak; too fast cooling or too high demolding temperature also aggravates shrinkage deformation.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solución
①Ensure sufficient crosslinking and increase the crosslinking density; ②control the cooling rate; ③appropriately lower the demolding temperature; ④aging treatment after setting.; After adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusión clave
Foam shrinkage is related to the degree of crosslinking and cooling history; sufficient crosslinking plus slow cooling and setting is the standard countermeasure.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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