Anti-rewet deck for press rolls

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 3/08 (2006.01) B01D 33/067 (2006.01) B30B 9/20 (2006.01) D21F 3/04 (2006.01) D21F 3/10 (2006.01)

Patent

CA 2160536

An anti-rewet deck is provided for press rolls (3) used to increase consistency of fibrous pulp sluryy from approximately 4 percent up to about 30 to 50 percent. This is accomplished by biasing the location of the drainage holes (140) in the roll shell to the forward edge of the drainage compartments within the roll shell. To avoid the necessity for handing of the rolls, a mechanism is provided for accomplishing the purposes of minimizing rewet at practical production rates by providing baffle plates (175, 177) which effectively orient the draining pattern in the desired direction. Such baffles can be permanently or removably installed once the desired handing of the rolls is determined.

L'invention se rapporte à un tablier anti-remouillage pour cylindres exprimeurs (3), servant à accroître la concentration de pâte dans la suspension fibreuse afin de la faire passer d'approximativement 4 % à environ 30 à 50 %. On obtient cette caractéristique en inclinant l'orientation des trous de drainage (140) de l'enveloppe des cylindres vers le bord avant des compartiments de drainage situés à l'intérieur de ladite enveloppe. Pour éviter de devoir installer les cylindres selon une symétrie spéculaire précise, on prévoit un mécanisme ayant pour fonction de réduire au minimum le remouillage aux vitesses de production pratiques, à l'aide de plaques déviatrices (175, 177) qui orientent efficacement les flux de drainage dans la direction désirée. Ces plaque déviatrices peuvent être installées en permanence ou de façon amovible une fois qu'on a déterminé la symétrie spéculaire désirée des cylindres.

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