Molds & Tooling
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EVA Foaming Shrinkage Deformation
Fenómeno do problema
Foamed shoe soles shrink greatly after demolding, and the dimensions are unstable.
Análise das causas
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
Solução
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
Conclusão principal
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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