MACHINERY | TWIN-SCREW EXTRUDERS
Right: Entek’s new HT72 extruder is its first high torque model offering a torque density of 18 Nm/cm3
energy, and improved productivity through ultra-high torque and high speed. “The basic performance of the
twin-screw kneading extruder required to achieve the above can be evaluated by three items: allowable torque, maximum screw rotation speed, and screw deep groove ratio,” the company says. “These mechanical performances continue to advance year by year in response to diversifying market needs.” Shibaura says allowable torque is an indicator of how much mechanical energy can be applied in order to sufficiently distribute, disperse, mix and extrude the raw materials supplied to the twin- screw kneading extruder. The mechanical elements that determine allowable torque are the drive system component, the screw shaft and the screw element. In particular, it highlights the use of a special spline on the screw shaft to reduce stress
Right: The TEM-41SX from Shibaura is part of its high torque compounding extruder series
concentration. High strength and
high toughness alloys and special manufacturing methods are used to ensure fatigue resistance and enable high torque transmission without increasing the shaft diameter. The TEM series is now in its sixth generation. The
latest TEM-SX series machines provide 3.6 times greater allowable torque compared to the TEM-A series. An increase in torque density means greater extrusion mass at constant screw rotational speed, or a decrease in screw rotational speed at constant extrusion mass. Further productivity improvement and quality improvement are possible compared with the conventional machine, according to the company. “Approximately 10 years have passed since the
IMAGE: SHIBAURA MACHINE
launch of the TEM-58SX, the first TEM-SX series, and it is our intention to further improve mechani- cal performance in order to contribute to the benefit of users by responding to the needs of adding new functions to plastics or increasing their functions,” Shibaura says. Around the beginning of this year, Turkish compounding machinery maker Polimer Teknik says it successfully tested a new line for processing glass fibre reinforced compounds. The line was based on a Poex T60HT unit with 58 mm screws
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info@xindacorp.com
IMAGE: ENTEK
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