Low-shear mixing cylinder uses counter-flow 'windows'.An unusual device for mixing two viscous viscous /vis·cous/ (vis´kus) sticky or gummy; having a high degree of viscosity. vis·cous adj. 1. Having relatively high resistance to flow. 2. Viscid. materials or adding powder or fiber to a polymer consists of two tightly fitting Adj. 1. tightly fitting - fitting snugly; "a tightly-fitting cover"; "tight-fitting clothes" tight fitting, tight-fitting, tightfitting, skinny tight - closely constrained or constricted or constricting; "tight skirts"; "he hated tight starched collars"; cylinders, one inside the other, with the outside one turning. "Windows" in the inner cylinder create drag flow and extensional mixing as material flows past. Engineers at the Commonwealth Scientific and Industrial Research Organization (CSIRO CSIRO Commonwealth Scientific & Industrial Research Organization (Australia) ) in Victoria, Australia, invented the concept four years ago (U.S. Patent 7121714; Oct. 17, 2006) and have experimented with dispersing nano-particles and fibers into urethane urethane (yoor´ithān´), n ethyl carbamate used as an anesthetic agent for laboratory animals, formerly used as a hypnotic in humans. and epoxy epoxy Any of a class of thermosetting polymers, polyethers built up from monomers with an ether group that takes the form of a three-membered epoxide ring. The familiar two-part epoxy adhesives consist of a resin with epoxide rings at the ends of its molecules and a curing . Called the Rotated Arc Mixer (RAM), the device could be used as a cylindrical section attached to a melt pump to combine polymer flows or to add powders or fibers to polymer. It could even potentially be modified as a mixing section for a single screw extruder, CSIRO says. The test cylinder is about 1.5 ft long and 15 mm diam. The device can also be partitioned so that two materials are combined and then after a break, another material is added. Tel: +61 (3) 9252-6083 * www.csiro.au [ILLUSTRATION OMITTED] |
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