Material Drying
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PPO Extrusion Bubbles
Fenómeno del problema
[Problem Phenomenon] Internal bubbles in PPO extruded profiles, density not up to standard
Análisis de la causa
Insufficient drying causes moisture vaporization or poor venting section performance entrains gas; PPO extrusion requires a vented extruder to discharge volatiles; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
Strengthen drying according to extrusion grade requirements; check vent port vacuum and smoothness; lower the feeding section temperature to prevent early melting and gas entrainment; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
For PPO extrusion bubbles check drying and the venting section; vacuum is the key; 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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