Molds & Tooling
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PA66 burnt gas trapping
Problem Phenomenon
PA66 products burn at fixed positions, and recurrence occurs shortly after cleaning
Cause Analysis
Burning at fixed positions is structural gas trapping, venting channels are insufficient or blocked by oil contamination, and adiabatic compression occurs repeatedly; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solution
Add vent inserts or vent grooves at that position; regularly clean vent grooves; reduce final-stage injection speed; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
Burning at fixed positions must structurally improve venting; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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