Patent ID: 6402894
Filing Date: 2002-06-11
Classification: D21C,D21D,D21F

Abstract:
An arrangement for washing and dewatering a fiber pulp suspension, comprising:a first and a second circular-cylindrical screen member, each screen member having an envelope surface and end walls, the screen members being rotatably towards one another to form a nip therebetween, the first screen member being hollow to permit evacuation of a liquid radially inwardly into the first screen member, the first screen member being arranged in a vat that partially encloses the envelope surface of the first screen member, the vat converging towards the envelope surface of the first screen member in a rotational direction of the first screen member; a first pulp inlet box being arranged adjacent to the first screen member for introducing a fiber pulp between the envelope surface of the first screen member and the vat to form a web of the fiber pulp on the first screen member; a means for introducing a wash liquid between the inlet box and the nip; a means of withdrawing dewatered pul after the nip; and a sealing arrangement having a seal for sealing between the end walls of the first and second screen members and a housing surrounding the first and second screen members, the seal being arranged a first distance from circumferential planes of the envelope surfaces and along a predetermined portion of a periphery of the envelope surfaces of the first and second screen members, the seal being arranged a second distance from the circumferential plane of the envelope surfaces adjacent to the nip, the second distance being greater than the first distance.