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Conventional circular motion and linear motion screen machines have a difficult time with sticky, adherent materials. The combination of particle shape,
moisture content, material and feed particle size distribution, contribute to material stickiness. It is difficult to predict how different materials will
behave at finer cut-points. When the material meets conditions where it can start adhering to conventional screen media it can quickly clog and blind over
the openings rendering the screen useless.
Conventional screen machines generate about 5 to 6 times the force of gravity; usually not enough force to break the adhesion of the small particles of many
materials like coal, limestone, sand with clay and so on. The LIWELL® screen machines generate 50 g and have enough force to dislodge adherent particles.
In particular, with classing moist materials and/or fine materials, the advantages of the LIWELL® are very noticeable compared to conventional screening machines
because of:
- Continuous operation without additional cleaning necessity
- Uniform screening results
- Higher efficiency and capacity
The combination of the unique machine LIWELL® principle together with screen mats especially
produced by Hein, Lehmann optimizes the results continuously:
- Conical hole shapes with better resistance against plugging and thus higher capacity.
- Low-wear materials of special polyurethane formulations with mechanical/dynamic properties remaining constant on a long-term basis.
The images below show screens with significant blinding of sticky material in the apertures of wire screens:
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