Injection Molding
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PPO Flash and Clamping
Problem Phenomenon
[Problem Phenomenon] Flash at the parting line of PPO products; short shot reappears after pressure reduction
Cause Analysis
PPO has high injection pressure requirements (100-140MPa), and flash occurs when clamping force is insufficient or the parting line is worn; the process window between high and low pressure is narrow; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Calculate the clamping force margin against the projected area; repair the parting line fit; use a staged injection curve to balance filling and flash; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPO's high pressure requirement tests the clamping; when flash and short shot coexist, check the equipment first; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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