Injection Molding
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Back Pressure Setting Problem in PBT '2079851475616104452
Problem Phenomenon
Too low back pressure causes poor plasticization of the material with unmelted particles, and too high back pressure generates shear heat degradation.
Cause Analysis
The back pressure is set improperly, and the back pressure is not set in coordination with the barrel temperature and screw speed.
Solution
Set the back pressure at 0.3-1.0MPa; optimize according to the plasticization quality and melt temperature.
Key Takeaway
PBT back pressure needs to balance plasticization and degradation risk.
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