Molds & Tooling
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Material venting from the vacuum port of PET extruder
Problem Phenomenon
Material vents from the vacuum vent port of the PET twin-screw extruder, and material overflows from the vacuum port.
Cause Analysis
The vacuum port position is improper (at a location with high melt pressure); vacuum port design is unreasonable; screw speed is on the high side and the filling degree of that section is high.
Solution
Adjust the vacuum port position to a low-pressure location; optimize vacuum port design; appropriately reduce screw speed or increase the temperature of that section.
Key Takeaway
PET extrusion vacuum port venting is closely related to screw configuration design and process parameters.
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