Injection Molding
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EVA product odor
Fenómeno del problema
Foamed or injection molded products have an acetic acid odor.
Análisis de la causa
Overheating during EVA processing causes the vinyl acetate segments to decompose and release acetic acid; excessively long residence time also produces it.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solución
①Control the processing temperature; ②shorten the residence time; ③clean the equipment; ④strengthen workshop ventilation.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
The acetic acid odor is a characteristic signal of EVA thermal degradation; temperature management can control it.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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