Abstract: The invention relates to a unit (3) for deaeration of drainage water from a paper machine, said unit comprising an inlet (8) for receiving the drainage water in a first flow direction, an outlet (39) for removing the drainage water to a subsequent deaeration channel, and a first chamber (5) that is arranged downstream of the inlet, said first chamber comprising a first chamber part (18), which comprises a guide wall portion (37) for redirecting the drainage water in a second flow direction that differs from the first flow direction, said guide wall portion being formed by a plurality of curved guide walls (10, 23) which interact with the drainage water so that the drainage water is decelerated and air is forced out of the drainage water, and two end walls (25, 26) which are arranged on respective sides of the guide walls, wherein each end wall of at least one of the flow channels exhibits an opening (27) that communicates with the flow channel for removing air that has been released from the drainage water in

Abstract: The invention relates to a unit (3) for deaeration of drainage water from a paper machine, said unit comprising an inlet (8) for receiving the drainage water in a first flow direction, an outlet (39) for removing the drainage water to a subsequent deaeration channel, and a first chamber (5) that is arranged downstream of the inlet, said first chamber comprising a first chamber part (18), which comprises a guide wall portion (37) for redirecting the drainage water in a second flow direction that differs from the first flow direction, said guide wall portion being formed by a plurality of curved guide walls (10, 23) which interact with the drainage water so that the drainage water is decelerated and air is forced out of the drainage water, and two end walls (25, 26) which are arranged on respective sides of the guide walls, wherein each end wall of at least one of the flow channels exhibits an opening (27) that communicates with the flow channel for removing air that has been released from the drainage water in

Abstract: A papermaking machine is provided for manufacturing a paper web, comprising a forming section having two clothings, a dewatering section comprising at least one paper manufacturing clothing, and a plurality of rotary rolls comprising guide rolls, each guide roll having two opposing flanges interconnected by a shell, each clothing running about some of the rotary rolls in a loop, wherein said papermaking machine is a tissue papermaking machine, at least one of the guide rolls is a lightweight guide roll supporting at least one of the clothings, and at least one of the shell and the flanges of said lightweight guide roll comprises a material with a density less than steel, wherein a weight of the lightweight guide roll is at least 10% less than a weight of a steel guide roll having the same dimensions and mechanical parameters. Associated devices and methods are also provided.