Material Drying
3 조회수
PPO Regrind Drying Time Extension
문제 현상
【Problem Phenomenon】PPO regrind dried the same as virgin material still shows moisture-related defects
원인 분석
Regrind particle size differs from virgin material, moisture diffusion rate differs, and drying time should be increased; SABIC also requires regrind to be kept clean to avoid foreign material contamination and attention to its effect on color
해결 방법
Dry regrind separately with extended time; crush and sieve regrind to keep it clean; evaluate regrind ratio according to application, stricter for drinking water certified and UL parts; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
핵심 요약
When PPO regrind particle size changes, diffusion changes, and drying time must be increased; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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