Processing Machinery
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PPO Cushion and Metering Stroke
Problem Phenomenon
【Problem Phenomenon】PPO metering is unstable, and product weight and dimensions fluctuate
Cause Analysis
GTX974 data gives metering stroke 0.5-3.5D and residual cushion 3-6mm (depending on metering stroke and screw diameter); improper cushion makes pressure transmission unstable
Solution
Set metering stroke at 0.5-3.5D; keep residual cushion at 3-6mm; for weight fluctuation, check cushion and non-return ring first; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PPO cushion 3-6mm ensures pressure transmission, metering stroke 0.5-3.5D is the boundary; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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