Two machine builders have developed super-small, high-tech twin-screw extruders with segmented screws that are said to be truly scaleable machines. Both are aimed at nano-compounding R&D. Leistritz in Somerville, N.J., invented a micro-plunger feeder (patent pending) for its new Nano-16, a 16-mmdiam. lab machine with 25:1 L/D. Before this, Leistritz’s smallest was 18 mm. The Nano-16 has only 1.18:1 OD/ID ratio, the lowest free volume anywhere for a scaleable twin-screw. It holds a total of under 25 grams in its fl ights. The piston-like micro-plunger slides inside a tube filled with the total amount of the test batch (up to 100 cc). It is locked in place, and pushed upward by a variable-speed drive to meter materials as slowly as 0.4 cc/min. The Nano-16 can corotate or counter-rotate at up to 500 rpm. (908) 685-2333 • www.leistritz.com C. W. Brabender Instruments Inc., S. Hackensack, N.J., has developed what it believes is the smallest scaleable twin-screw lab line capable of continuous operation. The Mini-Compounder TSE 12/36 has 12mm-diam. segmented screws and a clamshell barrel with metering or vents at 6D, 12D, and 26D positions and a side feeder or heated liquid feed pump at 14D. It can feed 5 to 500 g/hr. (201) 343-8425 • www.cwbrabender.com
Leistritz Extruder Co
169 Meister Ave Somerville, NJ 08876
Phone (908) 685-2333 Fax (908) 685-0247
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