machinery feature | Laboratory compounders
C.W. Brabender has updated its Prep-Mill for the small-scale milling of polymers
SFEM mixers. The researchers then quantified the mixing performance analysing both the number and volume distribution of the domain sizes to create a ‘dispersion map’. According to Luker, the importance of this method is that it quantifies dispersion for the first time. “This goes beyond qualitatively comparing pictures, which may not always give you an accurate comparison,” he explains. The technique can be broadly used in many applications where researchers want to compare dispersion. C.W. Brabender Instruments recently updated its
laboratory Prep-Mill, a heavy-duty, two-roll mill designed for small-scale milling of elastomeric and thermoplastic materials. The Prep-Mill’s electrical heating is designed to operate at temperatures up to 260°C, with an accuracy of +/- 1°C. The mill is designed to allow batch-to-batch mixing uniformity. Features include individual temperature controllers to
Compared to traditional mixing bowls used in many labs, the Micro-Batch Mixer can use smaller volumes of material and produce much better mixing, says Keith Luker, president of Randcastle. While mixing bowls require scraping the finished
material out of the bowl by hand, the Randcastle batch mixer extrudes a strand. In addition, the Micro-Batch Mixer scales up to a single-screw extruder using SFEM mixing elements. In a paper delivered at the SPE’s ANTEC conference earlier this year, researchers from the Dow Chemical Company and Randcastle compared dispersion in a conventional lab-scale mixing bowl to both a SFEM batch mixer and a 1-inch (25-mm) single-screw extruder equipped with three SFEM elements. Atomic force microscopy (AFM) images of the mixed samples showed larger, less dispersed domains in the mixing bowl, and smaller, more dispersed domains in the
control roll temperature, an adjustable gap with dial gauges to accurately determine gap setting, and a variable roll speed of 0-30 rpm monitored by a digital amp meter and rpm indicator. The transfer rolls have been improved with a durable coating for high wear resistance.
Click on the links for more information: ❙
www.leistritz.com ❙
www.ohm-hochschule.de ❙
www.coperion.com ❙
www.berstorff.com ❙
www.comacplast.it ❙
www.steerworld.com ❙
www.sinoalloy.com ❙
www.rondol.com ❙
www.xplore-together.com (DSM Xplore) ❙
www.busscorp.com ❙
www.bpprocess.com ❙
www.tpei.com ❙
www.randcastle.com ❙
www.cwbrabender.com
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