Abstract:
Machine for producing a web includes a system for predefining a quantity of a grade to be produced utilizing a measuring arrangement for measuring quality data during production of the web. The system defines the quantity of the grade to be produced by using data measured by the measuring arrangement during the production of the web.
Abstract:
An apparatus and a method for determining the permeability of a circulating band, in particular a water-absorbing dewatering band in a papermaking machine. The apparatus is equipped with a nozzle from which a measuring fluid flows onto or through the band. Fluctuations in the flow of the measuring fluid and in the nozzle exit pressure can distort the measurement of the permeability. The apparatus has a device for determining the speed of the band and/or a device for determining the nozzle exit speed and the nozzle exit pressure of the measuring fluid. These three measured variables are measured simultaneously, so that a fluctuation in one of these measured variables cannot impair the accuracy of the permeability measurement.
Abstract:
A method and apparatus for controlling at least one quality feature of a running material web, in particular a fibrous web, during its production, including a measurement system, an electronic control and/or an evaluation unit. The measurement system measures the quality feature on a running material web repeatedly over the entire width of the material web. The electronic control and/or evaluation unit determines the variability of the quality feature through a variance component analysis, which is conducted on the basis of the profile measure values of a measured value set including several consecutive CD profiles in the machine direction, the set having been recorded during a selectable previous time window. The result of this variance component analysis is also drawn on to control the quality feature.
Abstract:
A device for measuring at least one property of a material web, in particular a paper or board web, includes movable measuring probes provided on both sides of the web, which can be pressed against the web with preferably at least substantially equal force, forming a respective air pad, elements for measuring the air pads, in particular the air pad thickness, on both sides, and at least one property sensor, in particular a paper property sensor, fitted to a measuring probe supported by an air pad.
Abstract:
A method of determining at least one property of moving clothing of a machine for producing and/or treating a material web, in particular a paper or board web, which includes the following steps: arranging a nozzle opposite the surface of the moving clothing; producing a jet acting on the clothing by way of the nozzle contacting the moving clothing; measuring a variable representative of the flow through the nozzle; measuring a variable representative of the pressure of the jet at the nozzle outlet; determining the speed of the jet at the nozzle outlet from the nozzle flow and the free surface of the jet medium at the point of contact with the clothing; and determining the speed of the jet at the entry into the clothing from the speed of the jet at the nozzle outlet and the speed of the clothing. By using the speed of the jet at the entry into the clothing at a given pressure of the jet at the nozzle outlet and entry into the clothing, the water permeability of the moving clothing is determined and/or at least one surface property of the moving clothing is determined. A corresponding apparatus is also specified.
Abstract:
A device for measuring at least one property of a material web, in particular a paper or board web, includes movable measuring probes provided on both sides of the web, which can be pressed against the web with preferably at least substantially equal force, forming a respective air pad, elements for measuring the air pads, in particular the air pad thickness, on both sides, and at least one property sensor, in particular a paper property sensor, fitted to a measuring probe supported by an air pad.
Abstract:
A system for the computer-aided measurement of quality and/or process data during the production and/or conversion of a material web, in particular paper or board web, by way of correlation with raw measured data. The raw measured data is present in the form of other quality and process data during the production or conversion process. Measurements of quality parameters in the laboratory may also be incorporated in the raw measured data. The raw measured data is combined to form data sets which in each case are determined simultaneously. Specific laboratory or quality measurements are selected as target data which, by way of at least one soft-sensor algorithm running in a computer-based operation and linking unit, can be calculated from the other data serving as input data, and each data set containing measured data, which relates approximately to the same monitored volume of web and raw material, in particular paper and paper raw material.
Abstract:
A device for measuring the thickness of a sheet or web product including at least one moveable measuring sensor which can be pressed against the product while forming an air pad between measuring sensor and product. At least one measuring sensor is respectively provided on both sides of the sheet or web product. The thickness of the respective air pad can be measured, the total gap thickness including the thickness of the two air pads and the product thickness can be measured. Elements are provided for calculating the product thickness by subtracting the thickness of the air pad on the two product sides from the measured total gap thickness.
Abstract:
A measuring apparatus includes at least one sensor which is provided on a measuring frame, which can be positioned opposite moving clothing or a device. The devices being, for example, a roll, of a machine for producing and/or treating a material web, in particular a paper or board web. The measuring frame is pressed against the clothing or device by at least one pivoting lever and is connected to the pivoting lever by a cardan joint.
Abstract:
Device and process for measuring mass per unit area of sheet products and/or density of material in a pipe. The device includes a microwave element positionable to couple a high frequency electromagnetic field into a sheet to be measured, and a microwave signal generator coupled to the microwave element to generate at least one operating frequency having a frequency substantially higher than a relaxation frequency of water in said microwave element. A device for measuring an effect of the sheet on the high frequency electromagnetic field is provided, as is a device for calculating mass per unit area based upon the measured effect of the sheet on the high frequency electromagnetic field. 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.