D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
92/21
D21F 3/00 (2006.01) B30B 9/24 (2006.01) C02F 11/12 (2006.01)
Patent
CA 1052152
ABSTRACT OF THE DISCLOSURE A method and apparatus for dewatering aqueous materials wherein the suspension is compressed between two moving webs extending along a common path and applying additional pressure to the webs along a plurality of pressure paths parallel to the direction of travel of the webs and spaced apart from one another in a direction transverse thereto. The apparatus includes two endless webs having a common pressure path with an inlet thereto for introducing a suspension to be dewatered between the webs and an outlet therefrom for discharge of the dewatered suspension. At least one press roll is arranged along the pressure path and a portion of the peripheral surface thereof is in running contact with the webs, at least the outermost one of such webs with respect to the periphery of the press roll being pervious to liquid. The additional pressure is applied to the webs by a plurality of band- shaped elements extending in the direction of the pressure path and spaced apart from one another in a direction transverse thereto pressing the webs against the peripheral surface of the press roll. Means is provided for adjusting the tension in the bands and a pressure gradient can be applied to the bands in a direction transverse to the direction of travel of the webs.
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