Web monitoring for paper machines
May 7, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesOn-machine sheet material property analysis System and process for detecting properties of travelling sheets in the machine direction 5118195 Control system for a paper or board machine Automatic cross-directional control zone alignment for sheetmaking systems Sheetmaking system identification using synthetic measurement produced from redundant noisy measurements Measurement/control of sheet material using at least one sensor array Patent #: 5563809 InventorAssigneeApplicationNo. 750500 filed on 05/07/1997US Classes:700/122, Continuous material having indeterminate length (e.g., web, strand, strip, or sheet)162/263Measuring, testing, inspecting, indicating or illuminatingExaminersPrimary: Ruggiero, JosephAttorney, Agent or FirmForeign Patent References
International ClassG06F 019/00Foreign Application Priority Data1994-06-14 GBAbstractAn apparatus for web monitoring in paper making machines comprises a row of two or more lookers (6, 8) which are spaced across the width of the moving paper web. Each looker is stationery, and continuously inspects one or more small areas of the web as the web passes beneath. Optical signals from each individual inspection area are digitized, and spatial filtering is used to remove from the signals the effects of variations in the web which are much larger or much smaller than the variations being studied. A number of power spectra are calculated from the spatially filtered signals, and analysis of these functions is then used to identify significant features. Plots or tables of such features can be used to provide detailed information for the machine operator on the types of variations that are occurring in the paper web, and the possible causes of these variations.Other References
Field of SearchWith imagingWith scanning With comparison to reference or standard With indication of presence of material or feature With defect discrimination circuitry With camera or plural detectors With transversal scan BY MONITORING OF WEBS OR THREAD For flaws or imperfections Including transverse scanning Automatic control Of plural operations Electric controls or systems Measuring, testing, inspecting, indicating or illuminating With measuring, inspecting and/or testing | |
