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: The present invention relates to the dryer section of a paper machine consisting of a number dryer groups having dryer cylinders and one reversal role between each two dryers within a dryer group. The dryer section may have top felted or bottom felted dryer groups. A differential pressure box may be placed between the dryer cylinders and above the reversal roles in a top-felted dryer group and between the dryer cylinders and below reversal roles in a bottom felted dryer group. Between dryer groups the transfer between top felted dryer groups can occur with either an open or closed draw. The transfer between a top felted dryer group and a bottom felted dryer group occurs with an open draw. The size of the draw can be adjustable by making one or both of the guide rolls at the transfer moveable.

Abstract: Dryer section of a machine for producing a material web. The dryer section may include at least one dryer group including a plurality of heatable dryer cylinders so that the material web to be guided around at least a portion of the plurality of heatable dryer cylinders may be guided in a meandering path in a web travel direction. At least one pressing device may be located within the dryer section.

Abstract: A machine for producing a material web, including a paper or cardboard web, having a plurality of cylinders around which the material web is guided in a meandering path together with a conveyor (transport) belt. The machine further includes at least one air conveying device disposed in the transfer region between two cylinders. The air conveying device associates with the free circumference region of a cylinder and aspirates the material web as the material web travels in a path free from contact with the cylinders as the material web travels between two succeeding cylinders. The material web and the conveyor belt are partially wound around the circumference region of the cylinders. According to the invention, the air conveying device only covers certain areas of the free circumference region of the cylinder on which the material web (paper web) winds.

Abstract: Dryer section of a machine for manufacturing a material sheet. The dryer section may include at least one dryer cylinder, a plurality of sheet guide rolls, a transport belt for guiding the material sheet in a meandering manner around the at least one dryer cylinder and the plurality of sheet guide rolls, and threads surrounding at least one of the at least one dryer cylinder and the plurality of sheet guide rolls. The threads may be positioned between the material sheet and a surface of the at least one of the at least one dryer cylinder and the plurality of sheet guide rolls.

Abstract: A web drying apparatus, e.g., for a paper web, includes several heatable drying cylinders arranged in at least one row with at least one respective endless loop drying wire and preferably arranged in two rows of cylinders with two respective wires. A wire guide roll is between and offset from two of the adjacent cylinders in the one row. The one endless loop dryer wire carries the web thereon on a first part of the web loop path from the first cylinder to the wire guide roll. There the web separates from the wire and travels to a second cylinder in the second row. The wire wraps around the wire guide roll and returns on a second part of the web loop path to the next cylinder in the first row, without supporting a web. On the path between the first and third cylinders and around the wire guide roll, the wire defines a loop. An air guide box and a blower are arranged within the loop. The air guide box produces a vacuum at the first part of the wire loop path for drawing the web against the wire.

Abstract: A device to clean a transport belt of a machine for manufacturing a material web, in particular paper or cardboard web, is provided which includes at least one nozzle that can impart a medium under pressure and is designed to rotate on a rotational axis. The device is characterized in that the rotational speed of the nozzle for a gentle cleaning of the transport belt lies in the range of from about 2500 rpm to about 4000 rpm, and for an intensive cleaning of the transport belt in the range of from about 1000 rpm to about 2500 rpm.

Abstract: A device for cleaning a transport belt of a machine for manufacturing a material web, in particular a paper or cardboard web, is provided which includes at least one cleaning nozzle working in conjunction with a suction chamber. Thus, the transport belt can be imparted upon with a cleaning medium; and a suction device that is connected to the suction chamber also acts on the transport belt. The device includes at least one auxiliary nozzle from which a treatment medium, preferably fluid, serving to clean the suction device can be introduced into at least one of the suction chamber and a suction line of the suction device.

Abstract: A process and device for producing a pulp web utilizes several independently driven aggregates (i.e., discrete groups) to attain a median web dry content of, e.g., 60%. The number of driven aggregates may depend upon an initial wet strength of the wet pulp web. The relationship is such that when the initial wet strength is relatively high, the number of drier groups is small and when the initial wet strength is relatively low, the number of drier groups is large. However, each drier group includes only a few drier cylinders. The first drier group may include either one or two cylinders, and each subsequent drier group may include at least one drier cylinder more than the adjacent upstream drier group.

Abstract: A machine is proposed for the production of a material sheet, in particular a paper or cardboard sheet, with a dryer section which exhibits at least one double-row dryer group consisting of two rows of heated dryer cylinders, each of which has been assigned a transport belt circulating in a meandering fashion around the dryer cylinders of one row and the deflection rolls assigned to the dryer cylinders, thereby pressing the material sheet against the surface of the dryer cylinders, and having a drive mechanism consisting of at least one motor assigned to each row of dryer cylinders of a double-row dryer group, which causes a rotation of the dryer cylinders and deflection rolls as well as a circulation of the transport belts of the dryer section, in which the drive mechanism is designed such that the rotational speed of the two rows of dryer cylinders within the double-row dryer group can be regulated independently of one another.

Abstract: A process for cleaning a transport belt of a machine to manufacture a material web, in particular a paper or cardboard web, is provided so that the transport belt is cleaned with varying intensity across its width.

Abstract: A machine for manufacturing a continuous material web, in particular a paper or cardboard web, with at least one perforated cylinder sleeve and a suction roll exhibiting a manhole around which the material web is guided preferably with the aid of a transport band, whereby the interior of the suction roll can be put under a vacuum and is subdivided into at least two sections by a partition wall that is arranged essentially perpendicular to the rotation axis of the suction roll, wherein the partition wall is subdivided into sections and/or is manufactured of a flexible material and can thereby be inserted through the manhole and into the roll interior.

Abstract: Machine for producing a material web, e.g., paper or cardboard, that may include a dryer section with at least one dryer group and the at least one dryer group may have at least one dryer cylinder, a dryer screen, and a metal belt. The machine may also include a cooling device associated with the metal belt. The material web, the dryer screen and the metal belt may be guided in a meandering path around an outside of the at least one dryer cylinder, and the dryer screen may be positioned between the material web and the metal belt. Further, at least one of the metal belt and the dryer screen may be intensely prestressed.

Abstract: The invention proposes a jet device for a machine for producing a material web, in particular a paper or board web, having a nozzle device for dispensing a jet of liquid which is under pressure and is directed onto the material web and/or a transport belt guiding the material web. A changeover device by which the pressure with which the medium impinges on the transport belt or the material web, respectively, can be set.

Abstract: A drying section for a paper making machine includes a larger number of dryer sections, fewer dryers in each dryer section, and provisions for driving many of the dryers individually. The average number of dryers per dryer section is less than five and preferably less than four. By providing a small number of dryers per dryer section and driving many of the dryers individually, it is possible to more precisely compensate for stretching of the paper web in the initial stages of the drying process and to more precisely compensate for shrinkage of the paper web during the latter stages of the drying process.

Abstract: Device for producing a material web in a dryer part that includes at least one dryer section having a plurality of cylinders including heated cylinders and cooled cylinders. The device may also include a porous dryer screen and a metal belt that may be guided with the material web in a meandering path alternatingly around the heated and cooled cylinders. At least one of the metal belt and the dryer screen being highly prestressed and the device may also include at least one of a heating installation and a cooling installation assigned to act on an area of a circumference of the plurality of cylinders in which the material web may be supported by the dryer screen and the metal belt.

Abstract: The invention relates to a device for cleaning a moving transport belt in a papermaking machine, for instance a dry or wet wire belt or a felt belt, having at least one nozzle which can be directed against the transport belt for spraying the woven belt with liquid or gaseous fluid. A suction chamber 18 surrounds and cooperates with the cleaning nozzle (8), so that dirt and/or water mist detached by the nozzle jet (27) from the transport belt (4) or residual water are drawn into the suction chamber (18) and led away, avoiding dirtying or contamination of the nearby area.

Abstract: A drying section for a paper making machine. The drying section includes a plurality of single-tier dryer groups, optionally followed by one or more double-tier groups. To control curl in the final paper product, a moistening device extending over the width of the drying section is provided near the end of the single-tier dryer groups. The moistening device can be divided into various zones to control the profile of the paper. Alternatively, or in addition to the moistening device, a contact-less dryer such as a infrared dryer can be provided after the dryer section, upstream of a calendar section of the paper making machine. The moistening device can be provided to moisten the bottom or, optionally, the top side of the paper web. Where a double-tier dryer group is provided, to control curl the upper drying cylinders and the lower cylinders can be provided with different steam pressures to control curl. Alternatively, each of the cylinders can be individually controlled.

Abstract: The invention relates to a steam blower box for the application of steam onto a material web passing by, for example onto a paper web that is to be dewatered and is passing through the press section of a paper-manufacturing machine. The steam blower box extends, transverse to the web travel direction, over the entire web width and comprises a plurality of zone chambers, that are arranged side by side over the web width and are covered by a perforated steam exit panel. Each zone chamber is connected to a steam source via a control valve of its own. The steam exit panel can be removed for purposes of cleaning the zone chambers. Each of the zone chambers comprises a perforated panel insert which is likewise removable.