Processing Machinery
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PPO Cushion 4-10mm Management
Problem Phenomenon
【Problem Phenomenon】PPO holding pressure feeding effect is unstable, and product sink marks and dimensions fluctuate
Cause Analysis
SABIC recommends cushion 4-10mm to ensure effective transmission of holding pressure; too small a cushion interrupts feeding, too large causes melt retention and increased heat history; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Set cushion at 4-10mm and monitor repeatability; for sink mark parts, check whether the cushion is exhausted; regularly verify metering stability; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PPO cushion 4-10mm is the lifeline of holding pressure transmission; 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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