Material Drying
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PCABS pre-processing verification
Problem Phenomenon
PC/ABS moisture verification <0.02% before processing, irreversible hydrolysis prevention before high temperature.
Cause Analysis
Verify moisture <0.02% before PC/ABS processing; before the barrel is heated to 220-260℃; processing undried PC/ABS at high temperature triggers rapid irreversible molecular hydrolysis; the melt is already degraded before reaching the gate.
Solution
①Moisture verification before processing; ②<0.02% standard; ③confirmation before high temperature; ④awareness of irreversible hydrolysis; ⑤prevention first.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PCABS pre-processing verification is the key to hydrolysis prevention; irreversibility requires prevention first; standard execution ensures quality.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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