Material Drying
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PPO Bubbles and Internal Voids
Fenómeno del problema
Bubbles and voids appear inside PPO thick-walled products, found by X-ray inspection, and strength and sealing performance are affected.
Análisis de la causa
Moisture in the raw material vaporizes to form gas voids; the melt entrains air that cannot be discharged smoothly; thick-wall shrinkage vacuum forms voids; insufficient holding pressure leads to inadequate feeding.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solución
①Fully dry to remove moisture; ②optimize back pressure and injection speed to reduce air entrainment; ③strengthen holding pressure feeding in thick-wall areas; ④inspect and improve the venting system.; After adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusión clave
PPO internal voids need to be distinguished between gas and vacuum causes; drying and holding pressure each address the corresponding symptom; non-destructive testing is the quality guarantee for thick-walled parts.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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