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Thread: POWTECH 2004: Amandus Kahl

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    POWTECH 2004: Amandus Kahl

    Stand 9-336

    Extrusion Agglomeration using a Flat Die Pellet Press

    Extrusion agglomeration using a flat die press has proved to be a universally acceptable and economic method for compacting any lumpy, long-fibred, powdery, and pasty materials which have not been pre-ground. The final product is called pellet. Pan grinder rollers and dies are the important elements in the pelleting process. The axial forces required for the pelleting process are transmitted into the product by the pan grinder rollers, while compaction and agglomeration of the product take place in the effective bores of the die.

    The coarsely pre-crushed products are fed to the press vertically from above and form a product layer on the die. The pan grinder rollers run over this layer and compact it. The pressure is continuously increasing whilst the material is being rolled towards the effective bores, until it is high enough to transport another product element into the effective bores thereby pushing the product cylinder (plug) in the bores slightly forward. To achieve this, the axial force transmitted by the pan grinder rollers must be higher than the frictional force of the pellets inside the bores.

    The endless product strand formed in the effective bore leaves the press at the lower side of the die, where the strand is cut to the desired pellet length by means of adjustable knives.

    By intent a defined residual product layer remains between the die and the rollers in order to achieve better pre-compaction and product binding and to avoid metal-to-metal contact which could cause unnecessary wear of the pelleting tools. The rollers pass over each hole several times per second so that the pelleting process is discontinuous contrary to the more or less continuous process in an extrusion machine.

    Ranges of application of the pelleting process:
    Breweries, Chemical factories, Ironworks, Compound feed factories, Power stations, Plastics industry, Agriculture, Mineral industry, Food industry, Oil mills, Pharmaceutical industry, Drying plants, Pulp mills, Sugar factories etc.

    Product tests can be carried out in the KAHL pilot plant.

    In the following some examples:

    Catalysts, Vulcanization accelerators, Tablets, Vitamin C instant products,
    Pharmaceutical substances, Graphite, Pigments, Stearates, Plastics powder, Waste, Recycling Products, Fertilizers, Washing agent additives, Activated carbon, Sludges, Talc, RDF, etc..

    For more information, please visit:
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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