TECHNOLOGY | RECYCLING


Right: Wittmann’s G-Max 9 granulator with medium-height material hopper


be used on injection moulding machines with clamping forces of up to 900kN. Depending on the type of application, there are three material hoppers of different heights to choose from. The low material hopper is for use below a chute connected to the machine. The granulator is fed directly from the machine; no further handling is required. The medium-height material hopper is for use below a conveyor belt or drum separator, and is for small to medium-sized sprues. The standard-height material hopper is for a beside-the-press application with a sprue picker or robot. For optimal cutting performance and maximum


efficiency, the cutting rotor of the G-Max 9 comes with 3 × 3 knives arranged in a staggered position, which are said to produce a clean, uniform granu- late. Changing knives is apparently very easy. The material sifters of the G-Max 9 are available with holes in different sizes, with diameters of 4, 5, 6 or 8 mm, to accommodate different materials and throughput rates. The tiltable material hopper facilitates cleaning and servicing of the appliance. Changing a sifter can be carried out without tools. The G-Max 9 can handle a material throughput


of up to 20 kg/h (depending on the form of parts, pieces of sprue, sifter size and quality of material); it operates with a low noise level and Wittmann says it is “extremely energy-efficient.” Matsui highlights its Plas-aid SMGL3


low-speed granulators. Major features include improved ease of cleaning; greater ease of use, thanks to a newly designed hose connection system and lower receiving tanks design. The granulators


incorporate cutters with a new design that Matsui says ensures a stable granulating process and relief of granulating load. It says the stainless-steel


rotating blades produce uniformed grain size and minimize powder forma-


tion. The feeding hopper has extra sound-proofing.


“While our standard model SMGL3 is


known for its reliability, ease of maintenance, safety and environmental friendliness at a very reasonable price, our SMGL3 G3 series boasts also various additional innovative features, such as an improved controller; OSR (Overload Stop Retry), which detects reduced pulverisation performance due to overload and automatically reverses the rotation to re-start the grinding process; a power saving function, which adapts the rotation speed automatically to the load condition to avoid unnecessary energy consumption; and a metal detector that stops the operation automatically if contamination is detected,” says a representative.


More standard features At Conair, Dave Miller, VP Size- Reduction, says the biggest news on size reduction products at his company continues to be the ongoing success of its Viper


granulator line. This was announced at NPE 2018 but only came onto the market at the beginning of last year. From small press-side units to large, central granula- tors, Conair Viper granulators are available with


IMAGE: MATSUI


Matsui’s SMGLS


low-speed granulator


rotor diameters of 140, 200, 300, 420, 570, 810 and 900mm and maximum throughputs from 36 to 6,000kg/h. “Sales of Viper granulators have been very


strong, based on customer response to the wide range of standard features built into them,” says Miller.


He cites hardened steel (hardened to 550HV)


cutting chambers; water cooling on all rotors over 300mm; full acoustic insulation; larger screen areas for higher throughputs; easy-to-sharpen, easy-to-replace “pre-gapped” cutting knives;


30 INJECTION WORLD | March 2020 www.injectionworld.com


IMAGE: WITTMANN


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