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In summary, these relatively new fabrics are typically high-shed-count fabrics, designed to impart structure to wet webs using more or less exotic, and typically proprietary, weave styles. While used in separate wet shaping or sheet moulding sections on either TAD, UCTAD or pseudo-TAD machines, sheet structuring fabrics are in design very close, if not identical, to TAD fabrics. However, since these fabrics are used in sections where no thermal drying takes place, they are not exposed to hot air or to the resulting thermal stresses, hydrolysis and increased mechanical wear and tear that TAD fabrics are.

Tissue World, Nice, Page 33 © Copyright Pira International Ltd 2007 Developments in Tissue Manufacture Developments in tissue raw materials and consumables 2007). 3 below, is a laminate constructed with a perforated polymer as a top base with the shape, diameter and distribution of the perforations designed for optimum dewatering and pressure distribution. 3 Albany Apertech press fabric 5PQCBTFQPMZNFSXJUI BQFSUVSFTPS QFSGPSBUJPOT Source: Clemens Stortelder, Albany International During evaluations on a commercial TWF operating at 1,700m/min, the Apertech fabric permitted speed increases of as much as 7%, a 50% reduction of break-in time, and a 10% reduction in steam consumption.

This TAD machine can be, and has been, built in diameters up to 18ft and widths of up to a nominal 220in, and can be operated at speeds up to 1,900m/min. The design and construction of the TAD roll is quite unique. The roll has been demonstrated on a TAD machine in North America and, at present, at least one additional unit is on order. Large diameter Yankee dryers Driven by the need for higher drying capacities for technologies such as STT (see Chapter 5), as well as the general industry desire for higher capacity machines, Metso has developed advanced metallurgy and enlarged casting facilities to cast Yankees with diameters larger than the current maximum diameters of 18ft.

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