The Kahl Crown Expander: For expansion and shaping of compound feed and individual components
by Amandus Kahl GmbH, Germany
Two steps with one machine: The Kahl crown expander not only expands compound feed or individual components, but also shapes them simultaneously. This makes it possible to produce expanded and, at the same time, shaped products such as pellets for all animal species.
The aim of the engineers at Amandus Kahl was to design a new expander based on the worldwide and well-known Kahl Annular Gap Expander, equipped with a die at the outlet and a cutting device. An important component of the Annular Gap Expander also remains unchanged in the Crown Expander: The hydraulically movable cone, which is moved like a piston into the crown tool end. The pressure is approxiately 40 bar; the operating temperatures at the expander outlet are between 90 and 140°C. At the expander outlet, the pressure drops spontaneously. The product expands, and a part of the added water evaporates (flash evaporation). The size of the expanded particles or pellets can be determined by means of knives or dies.
The SME control with hydraulically adjustable cone ensures a significant improvement of the flexibility of expansion. Contrary to traditional pelleting, coarse particles remain coarse with the Kahl Crown Expander. The thick-walled mixing tube is equipped with replaceable liners and cantilevered shaft provided with proportioning, mixing and kneading elements. Existing Kahl Annular Gap Expanders can easily be modified to Crown Expanders. The treatment of grain components under pressure at a high temperature and moisture content modifies starch. Pathogenic germs, such as salmonellae or moulds, are eliminated by the treatment in the Crown Expander. Expanded mixtures increase the press capacity.
The German mechanical engineering company has been designing and manufacturing expanders for several decades and has a high level of expertise in this process technology. Based in northern Germany, the company manufactures its machines, individual parts, spare and wear parts exclusively in Germany. Visit our website for more information and an overview of the Kahl machine repertoire.