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Bulk handling 'breakthrough'
Page 34
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• An ability to transport granular materials up to 100ft vertically and to handle, for example, cereal products at 60 tons per hour with delivery at a height of 60ft through a 5in. pipe is claimed for a new materials handling system, the Siwer-Tell transporter. A Swedish invention, the Siwer-Tell is covered by world patents and the rights are held in Britain by Dry Bulkers Ltd, Sutton Bridge, Spalding, Lines — an associate company of Metalair Ltd.
The Siwer-Tell transporter uses either a single auger or counter-rotating screws to transport material inside a tube. The secret of the very high rates of discharge which are claimed for the system lies in the helix angles and, more particularly, the simple rotating fluid valve which feeds the material in to the base of the auger.
Dry Milkers say that whereas in a conventional vertical screw conveyor the material lies thinly along the edge of the screw, the rotating fluid valve feeds material in to the base of the screw in such a way that the auger becomes virtually a full pillar of moving material.
The average capacity with a normal vertical screw transporter, says Dry Bulkers, is about 20 per cent of the total transport area of the screw, but the Siwer-Tell system enables filling to• approach the theoretical capacity of 90 per cent of the transport area.
The system will move the whole range of powders, granular materials, chemicals, crushed minerals, ash, cellulose pulp, molasses and heavy oils.