Abstract: Water draining device for a paper machine or the like, in particular for a felted press of such a paper machine, including a receiving tank extending at least essentially over the machine width. The receiving tank includes a first chamber that receives arriving water and is under ambient pressure, and a second chamber that is connected to the first chamber and is under vacuum, into which the water collecting in the first chamber is aspirated and from which the water is eventually drained. A water receiving device of improved efficiency is also provided by forming a water receiving device by at least one suction channel projecting into the wedge-shaped area between the upper press roll and the dewatering belt, and extending transverse to the pulp web, which suction channel is connected to a source of reduced pressure.

Abstract: Water draining device for a paper machine or the like, in particular for a felted press of such a paper machine, including a receiving tank extending at least essentially over the machine width. The receiving tank includes a first chamber that receives arriving water and is under ambient pressure, and a second chamber that is connected to the first chamber and is under vacuum, into which the water collecting in the first chamber is aspirated and from which the water is eventually drained. A water receiving device of improved efficiency is also provided by forming a water receiving device by at least one suction channel projecting into the wedge-shaped area between the upper press roll and the dewatering belt, and extending transverse to the pulp web, which suction channel is connected to a source of reduced pressure.

Abstract: Pressing arrangement having two press rolls forming at least one press nip for dewatering a web, and two dewatering belts arranged to be guided through the at least one press nip with the web. The dewatering belts positioned on opposite sides of the web to absorb water. A common guidance path, formed by the dewatering belts guiding the web, is located after the at least one press nip. A separating roll and a lower one of the dewatering belts is arranged to wrap the separating roll along with the web at an end of the common guidance path. An upper one of the dewatering belts is arranged to be guided away from the web in a separation path in a region of the separating roll. Lower dewatering belt and web wrap the separating roll subsequent to the separation path at a wrapping angle of at least about 30°.

Abstract: A method of producing paper webs coated on both sides includes the following steps: a) indirectly applying a liquid onto the paper web by passing the web through at least one nip formed by a roll and a counterelement, whereafter the web is dried; b) next, directly applying coating mixture at surplus only on one side of the web, whereafter the surplus coating mixture is removed again by use of a doctor element, the web being dried again thereafter; and c) lastly, directly applying coating mixture at surplus only on the other web side, whereafter the surplus coating mixture is removed by use of a doctor, whereafter the web is dried again. In the indirect application of liquid in the nip, or in the nips, either coating mixture to produce so-called MWC papers or a sizing suspension to produce so-called LWC papers is selectively applied.

Abstract: A press for processing a web and a method of controlling a press. The press includes at least one nip having a first press roll and a second press roll. A first belt runs through the at least one nip. A second belt runs through the at least one nip. A sandwich stretch is formed by the first and second belts and is arranged after the at least one nip. A first mechanism is provided for driving the first belt. A second mechanism is provided for driving the second belt. The method includes driving the first belt at a first speed, and driving the second belt at a second speed, wherein the first speed is substantially the same as the second speed at least in a region of the sandwich stretch.

Abstract: Machine for producing a web includes a former for sheet formation of the web, a press section for dewatering the web, a drying section for drying the web, and at least one edge strip forming device positioned in an area of at least one of the press section and the drying section, which is arranged to separate at least one edge strip from the web.

Abstract: Device for conditioning, cleaning, and/or keeping clean at least one of a rotating roll and a circulating belt of a paper machine. The device includes at least two doctors arranged behind one another in a roll and/or belt travel direction and spaced at a distance from one another. The at least two doctors are assigned to the at least one of the rotating roll and the circulating belt.

Abstract: A method of producing paper webs coated on both sides includes the following steps: a) indirectly applying a liquid onto the paper web by passing the web through at least one nip formed by a roll and a counterelement, whereafter the web is dried; b) next, directly applying coating mixture at surplus only on one side of the web, whereafter the surplus coating mixture is removed again by use of a doctor element, the web being dried again thereafter; and c) lastly, directly applying coating mixture at surplus only on the other web side, whereafter the surplus coating mixture is removed by use of a doctor, whereafter the web is dried again. In the indirect application of liquid in the nip, or in the nips, either coating mixture to produce so-called MWC papers or a sizing suspension to produce so-called LWC papers is selectively applied.

Abstract: Press section of a machine and process for producing a fiber web. The press section includes at least two press nips arranged in succession in a web travel direction. Each of the at least two press nips is formed by two press rolls. At least one continuously revolving press belt is guided around each press roll. At least one of before and after at least one of the at least two press nips, a guide region is formed in which two of the press belts are arranged to run jointly along a straight path, and the fiber web is adapted to run between the two press belts along the straight path. Guide elements are arranged at an end of each guide region. At an end of each guide region, the press belts are guided over the guide elements to run separately from one another, and a press belt angle between the press belts at the guide elements is greater than approximately 15°.

Abstract: Dryer section and process for drying a fibrous web. Dryer section includes a plurality of dryer groups with at least one heated dryer cylinder and at least one belt to press the fibrous web against a surface of the at least one heated dryer cylinder. Transfer elements, i.e., a delivery transfer element and an accepting transfer element, are arranged to form at least one transfer point. Accepting transfer element has a greater speed than the delivering transfer element, and the transfer elements are arranged not to press against each other at the transfer point and to have a distance from one another of less than about 70 mm. Process includes guiding fibrous web to a first dryer group, pressing, with the at least one belt, fibrous web against surfaces of the at least one heated dryer cylinders of each dryer group, and transferring, without pressing, fibrous web between transfer elements.

Abstract: Machine for producing a web includes a former for sheet formation of the web, a press section for dewatering the web, a drying section for drying the web, and at least one edge strip forming device positioned in an area of at least one of the press section and the drying section, which is arranged to separate at least one edge strip from the web.

Abstract: Pressing arrangement having two press rolls forming at least one press nip for dewatering a web, and two dewatering belts arranged to be guided through the at least one press nip with the web. The dewatering belts positioned on opposite sides of the web to absorb water. A common guidance path, formed by the dewatering belts guiding the web, is located after the at least one press nip. A separating roll and a lower one of the dewatering belts is arranged to wrap the separating roll along with the web at an end of the common guidance path. An upper one of the dewatering belts is arranged to be guided away from the web in a separation path in a region of the separating roll. Lower dewatering belt and web wrap the separating roll subsequent to the separation path at a wrapping angle of at least about 30°.

Abstract: A method of producing paper webs coated on both sides includes the following steps: a) indirectly applying a liquid onto the paper web by passing the web through at least one nip formed by a roll and a counterelement, whereafter the web is dried; b) next, directly applying coating mixture at surplus only on one side of the web, whereafter the surplus coating mixture is removed again by use of a doctor element, the web being dried again thereafter; and c) lastly, directly applying coating mixture at surplus only on the other web side, whereafter the surplus coating mixture is removed by use of a doctor, whereafter the web is dried again. In the indirect application of liquid in the nip, or in the nips, either coating mixture to produce so-called MWC papers or a sizing suspension to produce so-called LWC papers is selectively applied.

Abstract: Device and method for draining a web in a paper production machine. The device may include a press section having at least one press nip for draining and smoothing the web. The at least one press nip may be arranged to smooth one surface of the web more than its opposite surface and the device may also include a roughening device that roughens the one surface of the web. The method may include guiding the web through a press section of the paper production machine to drain and smooth the web in which the press section include at least one nip, smoothing one surface of the web more than its opposite surface in the at least one nip, and roughening the one surface.

Abstract: A wet section (10) of a paper or cardboard machine and a process for the manufacture of a fibrous material web are suggested. The wet section (10) exhibits a double-screen segment (US), in which two screens (16, 18) are guided about parallel to one another and into which a fibrous material suspension (27) is introduced. The double-screen segment (US) is looped around a roll (22). The means (30, 32, 38) for the immobilization of the fibrous material suspension in the double-screen segment (US) are provided on the roll (22), for the formation of the fibrous material web. Moreover, the wet section exhibits means (32, 34, 36; 34, 36, 66) for further draining of the fibrous material web.

Abstract: A wet section of a machine for producing a fibrous material web that includes at least one press. The press includes a nip through which the fibrous material web is guided. The fibrous material web is preformed in a web forming zone. At least one press is an elongated nip press that is elongated in direction of the web travel. This nip is positioned in a region where the dry matter content of the preformed fibrous material web that comes into the nip is less than or equal to about 15% and, preferably is less than or equal to about 12%. A method for treating a fibrous material web in a wet section of a machine for producing the fibrous material web. The wet section includes at least one press including an elongated nip, at least one press and the elongated nip are elongated in a web travel direction. Further, the elongated nip is positioned in a region of the machine where the dry matter content of the fibrous material web, as it enters the elongated nip, is less than or equal to about 15%.

Abstract: Suction roll for the formation or treatment of a material web that includes an outer suction roll jacket comprising a perforated rotating hollow cylinder, a non-perforated support body arranged to extend through the outer suction roll jacket and to support the outer suction roll jacket at at least one point of its axial extent, and sealing ribs arranged to extend radially between the support body and the suction roll jacket and axially over a full length of the suction roll jacket. In this manner, the support body is adapted to rotate at a same speed as the suction roll jacket. The support body can include an axially extending, through-going bore arranged concentrically with the outer suction roll surface. An axially extending, rotationally fixed yoke extends through the through-going bore, and the rotationally fixed yoke has two ends which are supported outside of the support body on a frame. At least one support element is arranged to support the support body on the yoke.

Abstract: Drying section of a machine for producing a material web, such as a paper or cardboard web, comprises at least one drying group having at least one drying cylinder and at least one web guidance device around which the material web is guided in a meandering manner. The shrinkage gradient that occurs in the material web transversely with respect to the direction in which the web travels is set or controlled by providing at least one, and preferably several, areas in which an at least mostly free, unhindered shrinkage of the material web is possible.

Abstract: Process for cleaning a transport belt of a machine for manufacturing and/or processing a material web with at least one cleaning device. The process includes detecting the contamination of the transport belt with at least one sensor, generating a state matrix which contains the location coordinates of the detected contamination, and one of controlling and regulating the at least one cleaning device for cleaning over at least a width of the transport belt with a varying desired intensity of cleaning in accordance with the generated state matrix.

Abstract: Press section of a machine for manufacturing a fibrous pulp web. The press section may include a press roll, at least one flexible circulating press belt, at least one press shoe, and at least one extended press nip formed to extend in a web run direction by the press shoe pressing the flexible circulating press belt against the press roll. The press section further includes one of a felt or screen belt that may be guided through the at least one extended nip, and the press roll may be substantially centrally located within the press section and may have a diameter greater than a diameter of the at least one flexible circulating press belt. The center press roll has two press shoes positioned opposite it; the two press shoes are offset with respect to one another such that the direction of force exerted by each extends through the center press roll axis and defines an acute angle, with support elements within the center press roll positioned opposite the press shoes.