Xaloy Inc., Pulaski, Va., has built the first scaled-up, commercial version of a patented extensional-flow mixing device, under exclusive license from Stratek Plastic Ltd. in Wallingford, Conn. The device (described in an April ’07 article) attaches to the end of a single- or twin-screw extruder and provides intense, low-shear, low-temperature dispersive mixing ahead of a melt pump. Xaloy will build and market the mixers worldwide under the “nXmix” tradename. There are two initial models for 110 and 1100 lb/hr. The smaller unit is available for trials at Xaloy’s lab in New Castle, Pa. A 2200-lb/hr version is contemplated. The device uses a two-stage rotor. The first stage is a high-shear, extensional-flow section, followed by a low-shear tapered section with pockets incised into the rotor. The melt slows down as it goes over shallow axial grooves on the rotor. The initial extensional-flow mixing causes shear thinning of the melt so it can be processed at lower temperatures. Xaloy targets nXmix for dispersing small amounts of additives like nanoclays or carbon nanotubes, as well as for in-line compounding of highly filled blown film, pipe, and profiles and for any shear-sensitive mixing where lower melt temperature is desirable. (Stratek’s original prototype involved vibration of the outer housing, but that feature is not in Xaloy’s commercial version.) (724) 656-5600 • www.us.xaloy.com
102 Xaloy Way Pulaski, VA 24301
Phone (540) 980-7560 Fax (540) 980-5670
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