| 摘要 |
The present invention relates to an apparatus for treating fiber suspension. The apparatus in accordance with the present invention is especially suitable for screening pulps and also for thickening. More accurately, the apparatus relates to the pulse member construction of the screen or thickener being used. It is characteristic of all pulse members in accordance with the prior art that when the capacity of the screening apparatus is increased, for example, by using greater pressure differences or the cleanliness of the accept is increased by decreasing the size of the perforations or slots, this results in a situation, in which the screen cylinder tends to clog. The problem is thus keeping the screen cylinder clean, which is a precondition for optimizing other features in the screening. The present invention relates to a pulse member (P) of the screening apparatus, which is characterized in that the screen surface is subjected thereby with members (60) to a pulse cleaning the screen surface without a chance to allow the pressure effect "escape" past the area being cleaned. It is also typical of the pulse member in accordance with the present invention that the higher the consistency of the fiber matting is or the worse the screen surface is clogged, the stronger the pulse cleaning the screen surface is. |
