Molds & Tooling
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PP Vent Groove Design
Problem Phenomenon
[Problem Phenomenon] PP poor venting causes air entrapment and burning, or too-deep vents cause flash
Cause Analysis
PP melt has good fluidity; vent groove depth is controlled at 0.02-0.04mm: too shallow traps air, too deep causes overflow flash; focus venting on end ribs; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
Vent depth 0.02-0.04mm; strengthen end ribs; for flash check whether venting is too deep; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PP venting 0.02-0.04mm; shallow traps air and deep causes flash; 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 similar future problems
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