Material Drying
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PC/ABS hydrolysis impact strength decrease
Fenómeno del problema
The impact strength of the part is as much as 50% lower than the normal value, accompanied by silver streaks and bubbles.
Análisis de la causa
Hydrolysis occurs when processing wet pellets, permanently breaking the polymer molecular chains; hydrolysis damage is irreversible, and the decrease in molecular weight directly weakens impact performance.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solución
①Strictly dry to below 0.02% before processing; ②re-dry the damp material and test its performance; ③shorten the high-temperature residence time; ④store raw materials sealed.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Hydrolysis is the most serious moisture damage of PC/ABS; the risk of half strength loss makes drying a mandatory process.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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