Molds & Tooling
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PP Gate Mark Whitening
Problem Phenomenon
【Problem Phenomenon】PP gate cut whitens
Cause Analysis
Shear stress concentration in the gate area; PP toughness causes stress whitening of the cut surface; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Open the gate on a non-appearance surface; sharp trimming; submarine pinpoint gate; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
PP gate marks rely on position plus sharp trimming; 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 problems in the future
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