MACHINERY | ALTERNATIVE COMPOUNDERS
Right: B&P Littleford’s TriVolution system is said to offer good dispersive and distributive mixing
improve the venting and material feeding function and reduce energy consumption and space requirements. “Most importantly, it can produce a better dispersion and mixing and provide stability and precision extrusion,” he says.
Below: Farrel Pomini’s US Process Laboratory and Customer Demonstration Center at Ansonia
Working in triplicate KMD Plastifizierungstechnik, which changed its name from Keimei a few months ago, offers a triple-screw extruder. “Our current interest is in polyolefin production, material reaction and most importantly, material property modification and nanomaterial production,” says Project Manager Kevin Duan. He says the company has obtained “excellent” results in degassing, thanks to the much greater gas exchange area than available from twin-screw extruders. He says the “kneading frequency” (degassing frequency) is triple that of twin-screw extruders with three starts with the same cross section. However, Duan claims the triple-screw extruder is as convenient to use as a twin-screw. “You can change material as quickly, you can replace a screw as easily, and the screw adjustment is as conveni- ent,” he says. B&P Littleford’s TriVolution Compounder is something of a hybrid, being essentially a kneader with three screws. The company says it “offers excellent dispersive and distributive mixing without damaging critical ingredients by its innovative mixing mechanism. Its controlled shear with enhanced material exposure is also well adapted for devolatilisation and reactive processing.”
Minimising shear Farrel Pomini’s Continuous Mixing Technology (FCM) is said to offer several standard equipment features that address key concerns when process- ing flame retardant materials including ATH, MDH
and brominated based formulations. The FCM utilises two non-intermeshing, counter rotating rotors, which apply controlled levels of shear to the polymer. The company says this makes it an ideal technology for shear and temperature-sensitive materials. Among these are flame-retardant compounds. The FCM is based on a mixer with high free
volume. This enhances the quantity of flame-retard- ant filler materials that can be incorporated into the polymer matrix. Quantities of 75-80% have been routinely processed, a company representative says. When processing ATH, for example, Farrel
Pomini has found that by using a hard surface chamber liner and a combination of rotor styles, which it classifies as #15 and #7, it has been able to increase production rates by as much as 30% compared to a twin-screw machine but at process temperatures below 190°C. In addition, in the same study, melt temperature was found to be further decreased when rotor cooling was activated. In another scenario processing MDH, use of a
PTFE orifice resulted in a 15% lower melt tempera- ture. And in a separate study processing LLDPE & MDH (60%), and using the rotor styles #15 and #7 in combination with and a hard surface chamber liner, it proved possible to achieve a 30% increase in productivity with only a 17 °C process tempera- ture rise, the company says.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.busscorp.com �
www.x-compound.ch �
www.gneuss.com �
www.entex.de �
www.technovel.co.jp �
www.keimei.de �
www.bplittleford.com �
www.farrel-pomini.com
90 COMPOUNDING WORLD | October 2019
www.compoundingworld.com
PHOTO: FARREL POMINI
PHOTO: B&P LITTLEFORD
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