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HSEI twin screw extruders are starve fed, with the output rate determined by the feeder(s).
The use of a HSEI TSE to combine compounding/devolatilization with direct sheet extrusion presents challenges, in that the system will require intensive mixing in combination with consistent pumping.
The industry standard OD/ ID ratio for HSEI twin screw extruders is approximately 1.55.
Torque is another critical process parameter when discussing HSEI twin screw extrusion, and is directly related to the diameter of the screw shaft.
This combination of attributes makes it possible to process a wide variety of materials, some of which may not have been previously possible to process using an HSEI extruder.
Co-rotating (and counter-rotating) HSEI TSEs utilize segmented screws, assembled on high-torque splined shafts, and modular barrels with internal liquid-cooling bores.
The torque-limiting factor for a HSEI TSE is the screw shaft, based upon its cross-sectional area; the geometry of the shaft; the material of construction; and fabrication techniques.
HSEI TSE are starve fed (whereas singles are flood fed), with the output rate determined by the feeders, which meter pellets, liquids, powders, and fibers into the process section.