摘要:
A system for computer assisted monitoring of a cross profile of a quality parameter of a material web, especially a paper or cardboard web during its production and/or conversion, which includes a measuring system for measuring the cross profile, at least one computer based operations and logic unit for the determination of the standard deviations of at least two interference profiles that are representative for different interferences in the form of different peak groups in the measured cross profile. The different peak groups differentiate in that their peaks have different width ranges. Elements for storage, display and/or further processing of the determined standard deviations are also included.
摘要:
A system for computer assisted monitoring of a cross profile of a quality parameter of a material web, especially a paper or cardboard web during its production and/or conversion, which includes a measuring system for measuring the cross profile, at least one computer based operations and logic unit for the determination of the standard deviations of at least two interference profiles that are representative for different interferences in the form of different peak groups in the measured cross profile. The different peak groups differentiate in that their peaks have different width ranges. Elements for storage, display and/or further processing of the determined standard deviations are also included.
摘要:
Process for conditioning a circulating felt belt of a machine, pipe suction apparatus and traversing pipe suction apparatus therefor, the process including performing a zonal conditioning of a plurality of zones across a width of the felt belt by measuring at least one of, fibrous material web cross direction profile; felt belt cross direction profile; and permeability of the felt belt across the width of at least one of the web and the belt. The felt belt is conditioned depending on measuring results obtained for a respective zone. The pipe suction apparatus includes a ceramic body extending at least essentially across the entire width of the felt belt, the ceramic body being provided with a slotted surface by way of which the felt belt is subjectable to vacuum, with a respective effective amount of slotted surface being zonally variably adjustable by way of movable tongues.
摘要:
Process for determining disturbances of a moisture cross profile of a fibrous material web in a paper making machine, a paper making machine, and a measuring arrangement for measuring the disturbances, the process including guiding the fibrous material web by way of at least one water-permeable belt and collecting and draining off water released from the belt. The water is collected by several sections separated from one another. The process further includes measuring per time unit, the amount of water in each section, wherein the sections extend at right angles to a web running direction over only a partial section of the fibrous material web. The paper making machine includes at least one water-permeable belt, the belt being wrapped around a roll. The measuring arrangement includes a water collection device having the form of one of a trough or channel.
摘要:
The invention relates to a bar arrangement for a machine for producing a fibrous web. The bar arrangement according to the invention is characterized by at least one restoring mechanism for bringing the mobile bar from the operating position into the rest position. The at least one restoring mechanism comprises at least one guided piece arranged on the mobile bar on the exterior and alongside thereof, said piece having an inclined contact surface the incline of which is directed at an angle (α) in the range of 5 to 60°, preferably of 20 to 45°, especially of 25 to 35°, relative to the longitudinal direction of the mobile bar, at least one guiding piece on the interior of the C-shaped guiding unit, which has a preferably inclined guide surface that can be brought in contact with the inclined contact surface of the guided piece arranged on the exterior and alongside thereof when the mobile bar is brought from the operating position into the rest position, and at least one displacement device for displacing the mobile bar in its longitudinal direction which acts upon the mobile bar, preferably the face thereof, and which can preferably be controlled/regulated.
摘要:
The invention relates to a bar arrangement for a machine for producing a fibrous web. The bar arrangement according to the invention is characterized by at least one restoring mechanism for bringing the mobile bar from the operating position into the rest position. The at least one restoring mechanism comprises at least one guided piece arranged on the mobile bar on the exterior and alongside thereof, said piece having an inclined contact surface the incline of which is directed at an angle (α) in the range of 5 to 60°, preferably of 20 to 45°, especially of 25 to 35°, relative to the longitudinal direction of the mobile bar, at least one guiding piece on the interior of the C-shaped guiding unit, which has a preferably inclined guide surface that can be brought in contact with the inclined contact surface of the guided piece arranged on the exterior and alongside thereof when the mobile bar is brought from the operating position into the rest position, and at least one displacement device for displacing the mobile bar in its longitudinal direction which acts upon the mobile bar, preferably the face thereof, and which can preferably be controlled/regulated.
摘要:
Apparatus and process for dewatering a material web. The apparatus includes at least one pressure chamber formed by at least four substantially parallel rolls, a device arranged to introduce a pressurized gas into the at least one pressure chamber, and the at least four substantially parallel rolls being displaceable relative to one another to change an effective area of the at least one pressure chamber. The material web is guided through the at least one pressure chamber. The process includes pressurizing at least one pressure chamber with a gas medium, guiding the material web through the pressure chamber, driving water out of the material web using gas pressure within the at least one pressure chamber, and changing an effective area of the pressure chamber so as to adjust a dewatering capacity.
摘要:
An extended nip press for dewatering a pulp web has two press rolls that form an extended nip. The first press roll is retained in the axial direction at least at one end, and is held with its bearing pins on first bearing blocks. The second press roll is also held with its bearing pins on second bearing blocks. The second bearing blocks can be tensioned, each in pairs, with respect to the first bearing blocks by flexurally elastic tension elements, the tension elements allowing a relative displacement of the press rolls in the axial direction. The second bearing blocks are fixed in position with respect to the first bearing blocks in order to prevent excessive bending stress on the tension elements. For this purpose, either the rotary bearings of the second press roll are configured in non-tilting fashion, or additional support bearings are provided.
摘要:
A device for applying a liquid to pasty medium to a moving surface, the moving surface in the case of direct application being the surface of a paper, board or other fibrous web. In the case of indirect application the moving surface being the surface of a transfer element which transfers the application medium to the surface of the fibrous web. The device includes an applicator for applying the medium and a doctor device arranged downstream in the running direction of the moving surface for doctoring off and/or equalizing the medium applied to the moving surface. In order to collect excess medium that has not remained on the moving surface and/or has not reached the latter, a flexible collecting part covering the interspace between applicator and doctor device is provided, which extends transversely with respect to the running direction of the moving surface and parallel to the applicator and the doctor device.
摘要:
Press device to treat a fibrous pulp web that may include a shoe press roll and a mating roll. The shoe press roll and the mating roll may be positioned to form a press nip, and at least one endless belt guided through the press nip and forming a substantially non-flexible and rigid drive element at least partially driving the press device.