Injection Molding
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Burning During High-Speed Filling of PBT '2079851475616104452
Problem Phenomenon
Burnt black specks or brown marks appear at the end of PBT products.
Cause Analysis
The cavity venting is poor, and the air is rapidly compressed and heated, burning the material (diesel effect); the injection speed is too fast, and the air has no time to be discharged.
Solution
Improve cavity venting and increase the number and depth of vent grooves; appropriately reduce the injection speed; optimize the gate position.
Key Takeaway
PBT burning originates from insufficient venting.
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