Abstract: The invention relates to an arrangement for feeding a fibrous suspension (1) to at least one headbox (8) of a paper or cardboard machine with at least one diluting device (5), in which the fibrous suspension (1) is produced by mixing a high-consistency suspension (6) with a diluting liquid, wherein the diluting liquid is formed at least in part by backwater (2) of the paper or cardboard machine, the backwater (2) is pre-degassed in at least one open channel (3) and subsequently is guided into a diluting device (5) via a degassing device (4). The expenditure is to be reduced thereby in that the potential energy of the fibrous suspension (1) in the channel (3) is not above the potential energy of the fibrous suspension (1) in the diluting device (5) and the pressure at the outflow of the degassing device (4) is between ?0.3 and 1 bar or that the potential energy of the fibrous suspension (1) in the channel (3) is above the potential energy of the fibrous suspension (1) in the diluting device (5).

Abstract: The invention relates to an arrangement for fractionating a suspension of fibrous material suitable for creating a web of paper, board, tissue or some other fibrous material into a short fiber fraction with a high proportion of short and/or stiff fibers and/or vessel cells and a long fiber fraction with a high proportion of long and/or flexible fibers, comprising a screen element with screen openings which is taken past at least one nozzle which directs a jet of the fibrous material suspension onto the screen element, wherein the long fiber fraction is collected on the side of the screen element that is facing the nozzle and the short fiber fraction is collected on the opposite side of the screen element.

Abstract: The screening apparatus according to the invention is used for processing contaminated fibrous suspension, such as is produced during the preparation of waste paper. It has a housing (1) with a screen (3) which divides off an accepts chamber (2) from housing (1). A rotor (4) can be moved along close to the screen (3), by which the latter is kept free and, in addition, a rotational flow is produced. The housing (1) has a main part (7), which is cylindrical and of which the center is at an oblique angle (?) to the axis (12) of the rotor (4) which is between 1 and 60°, preferably between 5 and 25°. The typical position of use of this apparatus is the upright arrangement.

Abstract: Plant and process for cleaning and degassing a fibrous suspension. The plant includes a plurality of hydrocyclones, in which each hydrocyclone includes an intake connection, an accepts connection, and a rejects connection and at least two supply lines for feeding liquids into the plurality of hydrocyclones. At least two accepts lines, coupled to the accepts connections of the plurality of hydrocyclones, are structured and arranged to combine liquids cleaned of contaminants in the plurality of hydrocyclones, and at least one accepts draining pipe coupled to the at least two accepts lines is structured and arranged to open directly into a further line downstream. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Abstract: Plant and process for cleaning and degassing a fibrous suspension. The plant includes a plurality of hydrocyclones, in which each hydrocyclone includes an intake connection, an accepts connection, and a rejects connection and at least two supply lines for feeding liquids into the plurality of hydrocyclones. At least two accepts lines, coupled to the accepts connections of the plurality of hydrocyclones, are structured and arranged to combine liquids cleaned of contaminants in the plurality of hydrocyclones, and at least one accepts draining pipe coupled to the at least two accepts lines is structured and arranged to open directly into a further line downstream. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Abstract: Process and device for dispersing a fibrous paper web which comprises a substantially consistent fibrous paper material. The device includes an inlet for fibrous paper material, a stationary stator, and at least one rotatable rotor. The stator and the at least one rotor form a pulverizing zone including a pulverizing element located near the inlet for the fibrous paper material, the pulverizing element including least one of scrapers and knives for pulverizing the fibrous material into a fine, friable material; a vapor chamber forming a ring about the pulverizing zone, the vapor chamber being for calefying the fine, friable material formed by the pulverizing element; and a dispersing zone including at least one row of teeth on the stator and at least one row of teeth on the at least one rotor which can be moved relative to the at least one row of teeth of the stator.

Abstract: Connection device and process for connecting a hydrocyclone to a distribution and collection device, in which distribution and collection device includes connection openings for addition or removal of liquid during operation of the hydrocyclone. Connection device includes a pipe piece having an insertion side structured and arranged to be insertable through one of the connection openings into distribution and collection device. The insertion side includes a circumferential groove and a radial protrusion positioned adjacent circumferential groove, and radial protrusion has an outer diameter smaller than an inner diameter of the one connection opening and is structured to remain within distribution and collection device.

Abstract: Process for preparing dry broke in one of a paper, cardboard or coating machine. The process includes diluting the dry broke to a consistency of between about 15 to 60%, and slushing the dry broke with shear forces sufficient to crush filler particles in the dry broke.

Abstract: Process for preparing dry broke in one of a paper, cardboard or coating machine. The process includes diluting the dry broke to a consistency of between about 15 to 60%, and slushing the dry broke with shear forces sufficient to crush filler particles in the dry broke.

Abstract: Connection device and process for connecting a hydrocyclone to a distribution and collection device, in which distribution and collection device includes connection openings for addition or removal of liquid during operation of the hydrocyclone. Connection device includes a pipe piece having an insertion side structured and arranged to be insertable through one of the connection openings into distribution and collection devioce. The insertion side includes a circumferential groove and a radial protrusion positioned adjacent circumferential groove, and radial protrusion has an outer diameter smaller than an inner diameter of the one connection opening and is structured to remain within distribution and collection device.

Abstract: Process and device for dispersing a fibrous paper web which comprises a substantially consistent fibrous paper material. The device includes an inlet for fibrous paper material, a stationary stator, and at least one rotatable rotor. The stator and the at least one rotor form a pulverizing zone including a pulverizing element located near the inlet for the fibrous paper material, the pulverizing element including least one of scrapers and knives for pulverizing the fibrous material into a fine, friable material; a vapor chamber forming a ring about the pulverizing zone, the vapor chamber being for calefying the fine, friable material formed by the pulverizing element; and a dispersing zone including at least one row of teeth on the stator and at least one row of teeth on the at least one rotor which can be moved relative to the at least one row of teeth of the stator.

Abstract: The process is designed for the flotation of interfering materials from an aqueous fibrous pulp suspension and is in particular used in the processing of printed or used paper that is otherwise contaminated. The separation of gas bubbles of the suspension occurs in a flotation layer that has a maximum thickness of approximately 100 mm. The process also achieves good flotation results in fibrous pulp suspensions that have a fiber pulp content significantly larger than 1 % by weight, for example around 2% by weight. A flotation apparatus is provided for performing the flotation process. The apparatus includes a flotation vessel, an inlet, an outlet, and a skimmer device.

Abstract: Process for dispersing a fibrous paper web which comprises a substantially consistent fibrous paper material. The process includes loosening and pulverizing a fibrous paper material into a fine, friable fibrous material; guiding the fine, friable fibrous material into a vapor chamber in which at least one of a gaseous and vaporous heating medium mixes, calefies, and disperses the fine, friable fibrous material; and dispersing the fine, friable fibrous material in a disperser zone, the disperser zone and the vapor chamber being located in one device. A device for dispersing a fibrous paper web which comprises a substantially consistent fibrous paper material. The device includes an inlet for fibrous paper material, a stationary stator, and at least one rotatable rotor.

Abstract: The process is designed for the flotation of interfering materials from an aqueous fibrous pulp suspension and is in particular used in the processing of printed or used paper that is otherwise contaminated. The separation of gas bubbles of the suspension occurs in a flotation layer that has a maximum thickness of approximately 100 mm. The process also achieves good flotation results in fibrous pulp suspensions that have a fiber pulp content significantly larger than 1% by weight, for example around 2% by weight. A flotation apparatus is provided for performing the flotation process. The apparatus includes a flotation vessel, an inlet, an outlet, and a skimmer device.

Abstract: The method serves for the separation of solid materials out of a suspension and is, as a rule, implemented as a floatation method. The suspension (S) to be clarified is added tangentially from the outside at the periphery of a substantially cylindrical clarification volume (1). Damaging flow phenomena, such as for instance turbulence, are removed to the largest possible extent by flow means (2) which are applied prior to the entry of the suspension into the clarification volume so that an optimal flow takes place in the clarification volume (1). The flow is fed to the center of the clarification volume in a substantially spiral path (4), wherein the scum (6), which receives the materials to be separated out, forms on the surface. Various apparatuses for performing the method are proposed.

Abstract: In a sorting method for fiber suspensions, a dividing wall (3, 3') is used comprising openings via which the compenent particles in the suspension S to be sorted are classified according to their size. The beneficial transporting away of the rejected component particles is thus achieved on the inlet side (4) of the dividing wall (3,3') with the aid of flow blades (7,7'), whereas, on the outlet side (5), pressure pulses produced by clearers (6) act through the openings of the dividing wall preventing them from clogging up.