Improvements to Planetary Roller Extruders
Entex Rust & Mitschke GmbH, Bochum, Germany, has subjected its core product, the planetary roller extruder, to several improvement steps. Among other things, it has modified the feed zone, which was previously traditionally designed as a single screw. The new planetary feed cylinder is integrated into the modular Entex system, so that the raw materials used can be dosed directly into the process unit at almost any position of the extruder. According to the manufacturer, it offers improved feed behavior, especially for sticky raw materials, good self cleaning and a defined residence time spectrum. In addition, any conveying pulsation is eliminated by the direct feeding of the planetary roller interspaces. The temperature-control performance and mixing effect are already high during material feeding. Solid and liquid dosing can be combined along the module. The company has developed an interchangeable gear journal as interface between the gear and central spindle, which transmits the drive torque. The exterior toothing of the central spindle itself now serves for transferring the force. As a result, the maximum torque is claimed to increase by up to 30 % for the same extruder size. The system wear is reduced by improved mechanical guidance of the central spindle, and the ease of maintenance and installation is improved by the simplified construction.
Entex is expanding its "heavy duty series," which is equipped with a larger tooth module to achieve longer system lifetimes and longer maintenance intervals. The company is completing its 280S and 400S sizes with the smaller 150S and 180S. According to the manufacturer, these units allow even relatively small production lines to be realized for mechanically challenging products.
Hall 16, booth A42
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