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MACHINERY | FEEDERS


requirements. Azodos type P DV models are intended for volumetric metering of powdered products, providing a constant mass in coarse or fine flow operation. The basic machine consists of a housing containing one or two dosing screws (depending on the model), driven by frequency- controlled gear motors. An upstream discharge agitator ensures the screws are evenly filled from surge bins, which are also available in various sizes. This basic machine can be expanded with a


platform load cell or a three-point weighing frame to form an Azodos type P DW dosing system. When used as loss-in-weight scales, flexible connections at the supply hopper inlet and screw outlet decouple the system to prevent force shunts. The Azodos P DW can also be combined with an AzoCont dosing control to create a loss-in-weight feeder, which continuously regulates mass flow in terms of target and actual throughput. Up to 10 dosing stations can be controlled from a central AzoCont controller. AZO recently delivered two challenging


materials handling and mixing projects for US company BioLogiQ, which produces plastics from renewable resources such as starch generated as an excess product during potato processing. These thermoplastic starch (TPS) polymers are sold under the NuPlastiQ BioPolymers name and are designed to be blended with either conventional plastics or other bio-based resins. Explaining the project at last year’s k trade show in Germany, Azo said first discussions with BioLogiQ to design a processing solution for the natural based starch materials began in 2016.


“Together with technical expertise out of Germany, a short phase of brainstorming and system design led to a highly functional solution,” says Justin Sanders, BioLogiQ Plant Manager. First trials were carried out at the Azo test centre in Osterburken in Germany, with BioLogiQ subsequently carrying out further tests in its existing production operation in Blackfoot, Idaho. The next step was to adapt and scale up the


provisional test results to the layout of the two production plants, one in the US and a second in China. Azo carried out additional tests during the project phase as and when necessary. Azo said the handling and processing of the


starches presents special challenges due to the fluctuating properties of the sticky materials, critical dust explosion data, and some special features required for processing the wet compound. One of the core components of the system is the company’s AzoMixomat technology, which combines transporting, dosing, weighing, and mixing in a single unit.


Flexible feeding The K2019 show also saw Schenck Process reveal the latest addition to its Simplex Flat Bottom (FB) feeder family — the Simplex FB 650. This is designed for feeding plastic flakes, cellulose, hemp, glass or carbon fibres and other virgin or recycled materials for compounding applications (and also film lines). The high capacity stainless steel feeder includes a bottom-driven vertical agitator and auxiliary agitator feeder and is designed specifically for handling hard-to-feed


Feeder upgrade for fluffy materials


Leistritz does not offer feeding equipment as a stand-alone product line but it does build units for inclusion on its own compounding extrusion lines. At Leistritz Extrusion’s US operation in New Jersey, President/ General Manager Charlie Martin says it recently installed a crammer assist device to help get fluffy materials (low bulk density flakes, fibres, and the like) into a ZSE-MAXX twin screw extruder. A typical fluffy material feed system is configured with a


custom refill bin integrated with a weigh belt with rotary valve discharge; and a weigh belt feeder complete with AC motor/ drive, Martin says. The crammer assist device uses a screw auger that mates with the ZSE-MAXX feed throat to densify and push low bulk density materials into the feed. It includes a single screw auger with agitator assist arms in hardened steel; a stainless steel conical hopper with internal stator bars; and a latched lid with provision for multiple feed streams. � https://extruders.leistritz.com/en


42 COMPOUNDING WORLD | November 2020


Leistritz has added a crammer-assist feeder to this compounder in its US laboratory


IMAGE: LEISTRITZ


www.compoundingworld.com


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