| 摘要 |
PCT No. PCT/SE95/01042 Sec. 371 Date May 12, 1997 Sec. 102(e) Date May 12, 1997 PCT Filed Sep. 14, 1995 PCT Pub. No. WO96/08600 PCT Pub. Date Mar. 21, 1996A method for concentrating a suspension comprises the steps of providing a first surface; providing a second surface; introducing a suspension; moving the second surface relative to the first surface; and applying suction to the second surface. The first surface is relatively liquid-tight and includes a feature for increasing friction. The second surface is relatively liquid-pervious, faces the first surface, and is moveable relative to the first surface. Introduction of the suspension between the first and second surfaces forms a suspension web. Moving the second surface relative to the first surface and applying suction through the second surface causes dewatering of the suspension web and increased friction between the suspension web and the second surface. Also, moving the surfaces relative to each other and applying suction through the second surface causes pressing of the first surface towards the suspension web and the second surface to subject the suspension web to shear forces generated by relative movement between the feature for increasing friction and the second surface. This results in the particles of the suspension web being subjected to rolling between the first and second surface. |
