Method and apparatus for thickening fiber suspension

Details Method and apparatus for thickening fiber suspension Method and apparatus for thickening fiber suspension

D - Textiles, Paper

21

C

92/34

D21C 9/18 (2006.01) B01D 29/17 (2006.01)

Patent

CA 1313324

Abstract Method and apparatus for thickening fiber suspension The present invention relates to a method and an apparatus for thickening of fiber suspension. In particular, the invention relates to removal of water from pulp which is caused to thicken in a closed space equipped with a fine-perforated or fine-slotted screen surface. The problem with the prior art devices has been their complex structure or, in simpler solutions, their great susceptibility to clogging. These problems have been found out to be overcome through dimensioning of perforations in the screen surfaces (28, 30; 38, 40) of the thickener and the flow channels (33; 37) between the filtering surfaces (28, 30; 38, 40) in such a way that the pulp flows in the channels as a plug flow, that is, the internal friction of the pulp is greater than the surface friction between the pulp and the screen surface. Figure 4

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