Material Drying
4 조회수
PSU Trace Moisture High-temperature Degradation
문제 현상
[Problem Phenomenon] PSU equilibrium water absorption is only 0.6%, yet melt degradation and strength decline still occur due to moisture
원인 분석
PSU molecular structure has no hydrophilic groups and absorbs little water, but trace moisture triggers melt degradation under high temperatures above 280°C and strong shear; high processing temperatures amplify the effect of low moisture content
해결 방법
Fully dry before '2079851475616104452 and verify moisture content; manage moisture strictly under high-temperature grade processes; when degradation signs (discoloration, embrittlement) appear, check drying first; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
핵심 요약
Low water absorption of PSU does not mean water-tolerant processing; even trace water degrades under high-temperature shear; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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