Molds & Tooling
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PBT product air trap burning
Problem Phenomenon
Burnt marks at the end.
Cause Analysis
Poor venting causes adiabatic compression of air; high-speed filling aggravates it.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first when troubleshooting
Solution
①End venting grooves; ②reduce speed; ③clean the vents; ④optimize the gate.; after adjustment, continuously sample 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
The air trap position is where vents should be added.; after confirming effectiveness, solidify 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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