Molds & Tooling
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PBT Cold Material Jetting Marks
Problem Phenomenon
Jetting marks and cold material spots appear on the product surface, obvious near the gate
Cause Analysis
Low PBT nozzle temperature produces cold material entering the cavity; an overly small gate produces jetting; low resin temperature and mold temperature aggravate front condensation; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Increase nozzle and resin temperature; ②Enlarge the gate to reduce jetting; ③Set a cold slug well to intercept the cold material at the front; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PBT jetting marks are investigated along two lines: nozzle temperature and gate; the cold slug well is the interception means on the structure side; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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