Extrusion & Post
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Excessive Temperature Rise in PBT Twin-Screw Extrusion Pelletizing
Problem Phenomenon
During recycled PBT pelletizing, the twin-screw temperature rise is too high, causing degradation.
Cause Analysis
The screw speed is too high and the gearbox heats up; the cooling is insufficient; the shear heat accumulates.
Solution
Appropriately reduce the screw speed; strengthen barrel cooling; use a low-shear screw configuration.
Key Takeaway
PBT pelletizing temperature control is closely related to screw design.
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