Injection Molding
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Jetting in PBT Injection Mold Cavity
Problem Phenomenon
The melt enters the cavity in a high-speed jet instead of normal filling flow.
Cause Analysis
The gate size is too small, producing jetting; the injection speed is too high; the distance between the gate and the cavity wall is insufficient, causing the melt to shoot straight.
Solution
Increase the gate size or use a fan gate; reduce the injection speed in the gate area; change the gate position so that the melt hits the wall and decelerates.
Key Takeaway
PBT jetting disrupts the normal filling pattern.
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