Sealing arrangement for a pulp dewatering arrangement

An arrangement for washing and dewatering a fiber pulp suspension, comprising:

• a first circular-cylindrical screen member in rotatable operative engagement with a second circular-cylindrical member to form a nip, the first member being rotatable in a first direction and the second member being rotatable in a second direction opposite the first direction;
• the first screen member being disposed in a trough that partially encloses a casing of the first screen member, the trough converging towards the casing in the first rotational direction of the first screen member;
• a pulp headbox box arranged at the first screen member for introducing pulp to the casing and the trough for forming a fiber pulp web, the pulp headbox having a sealing arrangement arranged between the pulp headbox and the first screen member;
• the sealing arrangement having a sealing surface with a progressively decreasing gap defined between the pulp headbox and the first screen member in a direction opposite to the first rotational direction of the first screen member, the gap, at an inner edge of the pulp headbox, corresponding to a first dimension (B), and the gap, at an outer edge of the pulp headbox, corresponding to a second dimension (A), the gap having a circumferential portion extending over the first screen member exceeding the dimension (B) by at least two times.