Material Drying
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PA12 Strength Decrease from Hydrolysis
Problem Phenomenon
Product strength and toughness decrease, with a large gap from the nominal values of the material.
Cause Analysis
PA12 hydrolyzes at high temperature after absorbing water, breaking molecular chains; when the moisture content exceeds the standard, strength decreases by more than 20%, and hydrolysis damage is irreversible.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based solely on experience
Solution
①Strictly dry to below 0.1% before processing; ②re-dry and test damped material; ③shorten high-temperature residence; ④sealed storage.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PA12 hydrolysis damage is irreversible; drying is the only means to protect performance.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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