Material Drying
3 조회수
PPO Silver Streaks and Shear Overheating
문제 현상
[Problem Phenomenon] Silver streaks still appear on products after PPO drying is qualified, fixed near the gate
원인 분석
Shear-overheating-type silver streaks: too-small gate or too-fast injection speed causes melt shear degradation producing volatiles; the cause differs from moisture-type silver streaks and must be distinguished; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
해결 방법
For silver streaks fixed near the gate check shear: enlarge the gate and reduce injection speed; for random silver streaks over the whole surface check moisture; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
핵심 요약
PPO silver streaks are divided into moisture position and shear position; the location distribution points to the cause; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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