Injection Molding
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PPO Injection Speed Grading
Problem Phenomenon
【Problem Phenomenon】PPO injection speed is set improperly, and jetting and short shot problems alternate
Cause Analysis
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
Solution
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
Key Takeaway
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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