Injection Molding
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Abnormal In-Mold Pressure Curve in PBT '2079851475616104452
Problem Phenomenon
The in-mold pressure sensor curve shows an abnormal shape (double peaks or multiple peaks), and the filling is unstable.
Cause Analysis
During multi-gate filling, the arrival times of the melt streams are different, producing pressure fluctuations; cold material entering the cavity causes this.
Solution
Optimize the runner balance; increase the melt temperature and mold temperature; use a cold slug well to capture cold material.
Key Takeaway
The PBT in-mold pressure curve is the basis for filling quality diagnosis.
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