Injection Molding
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PPO Injection Speed Grading
Fenómeno do problema
【Problem Phenomenon】PPO injection speed is set improperly, and jetting and short shot problems alternate
Análise das causas
SABIC recommends injection speed from medium to fast; too slow means front freezing and short shots, too fast means shear and jetting risks; long-runner thin walls need fast speed but must be matched with venting
Solução
Set injection speed in grades from medium to fast; fast speed for long-runner parts matched with venting; reduce initial speed when jetting signs appear; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusão principal
PPO injection medium to fast; between fast and slow depends on flow length and venting; 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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