Molds & Tooling
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PPO Internal Stress and Low Melt Temperature
문제 현상
[Problem Phenomenon] PPO products have large internal stress, deforming and cracking after storage
원인 분석
Processing pure PPO with barrel temperature below 280°C easily produces high in-mold stress; the high-viscosity melt freezes quickly, sealing in orientation stress; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
해결 방법
Barrel temperature for pure PPO not lower than 280°C; hot mold at 110-150°C to reduce stress; post-process after molding according to procedures to relieve stress; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
핵심 요약
PPO internal stress is linked to melt temperature, and below 280°C is a stress-prone zone; 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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