Injection Molding
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PPO Holding Pressure Ratio
Problem Phenomenon
【Problem Phenomenon】PPO holding pressure is set improperly, and sink mark and internal stress problems alternate
Cause Analysis
PPO holding pressure is generally 40%-60% of injection pressure; too low means insufficient feeding and sink marks, too high means internal stress and demolding difficulty; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Set holding pressure at 40-60% of injection pressure; sink mark parts take the upper limit, stress-sensitive parts take the lower limit; holding pressure time is determined by gate freezing; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PPO holding pressure is 40-60% of injection pressure; take the value by weighing sink marks versus stress; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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