Molds & Tooling
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PBT Vent Slot 0.02mm
Problem Phenomenon
Burning and gas trapping at the end of the product; after deepening the vent, the low-viscosity melt produces flash and overflow
Cause Analysis
PBT's low viscosity requires high vent precision: vent slot width 1-5mm, depth 0.02mm; if too deep it overflows, and mold machining precision must be guaranteed; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Vent slot width 1-5mm, depth 0.02mm; ②Improve mold machining precision to prevent overflow; ③Regularly clean the vent slots to prevent mold deposit blockage; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PBT venting is precision work at the 0.02mm level; the window between gas trapping and overflow is guaranteed by mold precision; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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