Injection Molding
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PP Burnt Mark at the End
Problem Phenomenon
PP burnt marks at the flow end, trapped air adiabatic compression, speed and venting adjustment.
Cause Analysis
PP burnt marks at the flow end; air trapped adiabatic compression high temperature; injection speed too fast; poor venting; end confluence area; recurrence after purging.; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Reduce injection speed; ②improve venting; ③end venting; ④purging; ⑤recurrence monitoring.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Speed and venting are the adjustment directions for PP burnt; the end is the key area; monitoring prevents recurrence.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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