Compared to a conventional screw heat exchanger the new design, a 2:1 screw pitch ratio — and a corresponding 1:2 speed ratio between the two shafts —  provides self-cleaning operation, aided by narrow gaps between the screw flights. (Picture: Köllemann)
Modified Screw Heat Exchanger

Screw Heat Exchanger Keeping Itself Clean

For many industries that produce, process, or handle bulk solids, the screw heat exchanger is a well-known piece of equipment for heating, drying and cooling. With the same working principle as a conventional screw conveyor, however, most screw heat exchangers rely on the flowability of the bulk solid for good mixing and to keep their heat transfer surfaces clean. As a result, these standard screw heat exchangers cannot be used for sticky, pasty or adhesive materials or slurries.

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The special 3-D depth filter structure consists of rolled filter layers and ensures reproducible filtration properties for high-quality applications. (Martin Wolf Wagner/ Wolftechnik)
New Product

The 3-D Filter Structure Makes the Difference

With its specially aligned three-dimensional fiber matrix, the AS Depth filter cartridge with 3D filter structure from Wolftechnik has up to 5 times more dirt holding capacity than conventional depth filter cartridges for classification. The 3-D filter structure is particularly suitable for the classification of liquids with high solid content, so-called slurry.

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 (Picture: Eastman)
Acetate Tow

Eastman Takes Part in Chinese Acetate Tow Production

Eastman Shuangwei Fibers Company Limited (ESFCL), a joint venture of Eastman Chemicals and China National Tobacco began construction works for an acetate tow production site in Heifei, China. This cooperation, Eastman officials said, underlined both the company's commitment to China as well as to its fibre business.

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