| US 7,476,293 B2 | ||
| Advanced dewatering system | ||
| Jeffrey Herman, Bala Cynwyd, Pa. (US); Thomas Thoroee Scherb, Sao Paulo (Brazil); Luiz Carlos Silva, Campo Limpo (Brazil); and Hubert Walkenhaus, Kerpen (Germany) | ||
| Assigned to Voith Patent GmbH, Heidenheim (Germany) | ||
| Filed on Oct. 26, 2004, as Appl. No. 10/972,408. | ||
| Prior Publication US 2006/0085998 A1, Apr. 27, 2006 | ||
| Int. Cl. D21F 5/02 (2006.01); D21F 5/14 (2006.01); D21F 3/04 (2006.01); D21F 7/12 (2006.01) | ||
| U.S. Cl. 162—206 [162/205; 162/207; 162/358.1; 162/358.2; 162/358.3; 162/368; 162/900; 162/901] | 82 Claims |
| 1. A system for drying a tissue or hygiene web, comprising:
a permeable structured fabric carrying the web over a drying apparatus;
a permeable dewatering fabric contacting the web and being guided over the drying apparatus; and
a compressibility of the permeable structured fabric being lower than that of the permeable dewatering fabric; and
a mechanism for applying pressure, via a movable pressure surface, to the permeable structured fabric, the web, and the permeable
dewatering fabric at the drying apparatus,
wherein a negative pressure is applied to the permeable dewatering fabric such that air flows first through the permeable
structured fabric, then through the web, and then through the permeable dewatering fabric and into the drying apparatus.
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