JOEST Screening Technology


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JOEST Zig Zag Air Separator


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JOEST Fluidized Bed Dryer


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J O E S T   S C R E E N I N G – T E C H N O L O G Y

Three solutions for efficient screening

The JOEST Flip-Flow Screen from the OSCILLA Family and the JOEST Finger-Cascade Screen TopSpin are ideal solutions for pre-classification and screening of challenging, inhomogeneous recycling products. For pre-classification in recycling plants and screening of challenging, inhomogeneous products, screening technology by JOEST provides ideal solutions. JOEST guarantees a near blockage-free screening performance and loosening of the material. In addition to the Finger-Cascade Screen TopSpin for pre-classification, we offer Flip-Flow Screens from the OSCILLA family for further processing steps. Applications range from plastics, domestic and industrial waste and shredder scrap to compost, rocks, ores, minerals and coal.

Flip-Flow Screen OSCILLA Classic

The Flip-Flow Screen OSCILLA Classic is the foundation of the entire OSCILLA Family, which are all based on a resonance system. The internal screen frame performs a relative motion in reaction to the directly excited external frame. Flexible polyurethane screens are attached to both frames with one side each. The relative motion of the frames exerts and releases tension on the screens, resulting in acceleration rates of up to 50 G on the screen deck.

The newly designed Vibroblocks combined with aluminum cross bars enable larger oscillation amplitudes and acceleration rates than conventional Flip-Flow Screens. The circular motion of the base frame excites the internal frame, creating an overlay of oscillations. The overlay enhances material flow by exerting additional acceleration forces on the product. Even if the machine was overflowing with material, it would be capable of clearing itself. Typical separation steps are around 40 mm.

For the OSCILLA Classic, the decline angle can be reduced to a minimum of 10 degrees. The drive system of the Flip-Flow Screen is available with grease or oil lubrication. In addition to wear protection, anti-stick coatings, electronic machine monitoring and amplitude control, we offer a variety of individual options and configurations to meet your demands.  

Finger-Cascade Screen TopSpin

For larger separations up to 300 mm, primarily for pre-classification in recycling plants, we designed the JOEST Finger-Cascade Screen TopSpin. The technology implemented here guarantees a blockage free screen and discharge of long parts into the screen overflow. The machine is based on a circular oscillating screen with JOEST shaft drives, achieving above average acceleration rates. Combined with the conically opening Finger-Cascade System, the material is loosened and screened with little to no blockages. Optimal results are achieved when adding an impact area for better material distribution and additional material circulators. Individual demands are met with features such as machine-mounted or stationary covers, isolation frames and many more.  

Finger Cascade Screen TopSpin Example 1

Flip-Flow Screen OSCILLA Combi

Another member of the OSCILLA Family, the OSCILLA Combi, combines the previously mentioned machines, providing you with the best of both worlds.

The OSCILLA Combi Flip-Flow Screen is a combination of the OSCILLA Classic with any conventional screen deck(s) of choice. A particularly effective system is created by combining the OSCILLA with the finger cascade screen TopSpin. Its geometry results in a strong self-cleaning effect, even with heterogeneous materials.

OSCILLA Combi is mainly used to reduce the load on the Flip-Flow Screen by adding a larger separation stage or limiting the maximal grain size. Furthermore, an additional separating cut can be implemented that is not suited for a Flip-Flow Screen. The OSCILLA Combi is driven by one or multiple shaft drives. Since the OSCILLA deck is easily adjusted on its own, the base oscillation amplitude is set for the conventional screen deck. Features and configurations from both machine components are applicable here.

Zig Zag Air Separator

With its high separating precision & compact design, the Zig-Zag Separator is the ideal solution to separate labels from PET-Flakes or heavy impurities (minerals, metals or 3D parts made of substitute fuels).  

The JOEST Zig-Zag Separator separates light-weight materials from heavy ones using the multiple crossflow sifting process. Due to its high separating precision, it is often used in challenging sorting applications. The material is fed into the Zig-Zag shaped sifter channel by a special vibrating feeder. Unlike a cellular wheel, the feeder achieves an even product stream, reducing susceptibility. A radial fan provides the required airflow which enters at the base of the machine and travels to the top. Placing the fan on top of the cyclone ensures optimal air circulation and a compact form factor. Inside of the sifting channel, lightweight particles are conveyed upwards through a system of pipes into the cyclone. Here they are discharged by a cellular wheel air lock. Heavy particles fall through the sifting channel and are discharged at the base of the machine. The sifting channel can be designed with 4 to 15 separation steps, depending on the application. Maintenance flaps are included for easy service and cleaning. The Zig-Zag Separator is typically operated with partial air recirculation. A special blow-through filter system is included in the design, enabling the machine to stand autonomously. Special design features can be added, depending on your application.

Fluidized Bed Dryer

Even treatment with optimized convection

The Vibrating Fluidized Bed Dryer guarantees highly efficient drying of e.g. PET-Flakes through convection. The Product is conveyed through micro-throwing motions & processed uniformly by optimized air flows.

The JOEST Vibrating Fluidized Bed Dryer dries materials such as PET-Flakes using convection. This way the product is in direct contact with the heat transferring medium. The product is conveyed through the dryer by a micro-throwing motion, whilst hot air travels through the material stream. Various energy sources can be used to heat the processing air.

The special design and thermal isolation of the air distribution chamber support an optimized air flow regulation. This results in an even processing and drying performance. Processing air temperature for plastics is typically around 120 °C and can be increased to 400°C in the standard version. Different drying results are achievable, depending on the feed conditions. With a grain size of up to 25 mm and a throughput of 5 tons per hour, the product moisture can be reduced from 10% to 0,2%.

Furthermore, the separation into multiple zones for drying and downstream cooling is possible. The dryer can be operated with fresh air or (partial-)air recirculation. Configurations with machine-mounted or stationary hoods, as well as different standard- and stainless-steel options are available.

For easy maintenance, service flaps are equipped with gas pressure springs and quick-release levers. The machine is driven by the well proven JOEST Unbalanced Drives. They can be configured with electronic controls for the dwell time. Upon request, different drives can be implemented.