Paper making and fiber liberation – Processes and products – With measuring – inspecting and/or testing
Reexamination Certificate
2001-12-05
2004-03-30
Chin, Peter (Department: 1731)
Paper making and fiber liberation
Processes and products
With measuring, inspecting and/or testing
C162S049000, C162S263000, C162S253000, C162S254000, C162S259000, C162SDIG004, C034S080000, C034S080000, C034S080000, C034S446000, C073S073000
Reexamination Certificate
active
06712937
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method for the operation of a machine for the manufacture and/or refinement of material webs, in particular paper webs. The invention also relates to a measurement system for the carrying out of such a method.
2. Discussion of Background Information
Such machines, for example paper making machines, consist of a plurality of different machine sections of which at least some are in turn subdivided into further part sections. Each machine section or part section influences the quality of the finished product, for example of a paper web. It is possible to influence the manufacturing process by appropriate control and regulation of individual machine components forming the respective machine section or part section. The large number of possibilities of adjustment makes it difficult to determine the influence of changes which are made at individual machine components on the ability of the respective machine section or part section to function or on the quality of the finished product.
It is known to carry out moisture content, thickness and weight per unit area measurements following the dryer section of a paper making machine, for example before the roller, and to use these measurements for the control, regulation and optimisation of the process control. It is known, simply for the determination of the moisture content of the paper, to carry out measurements at the start of the dryer section, continuously, regularly—i.e. taking place at specific or process-dependent intervals—or in the short term. Furthermore it is known to carry out continuous, regular or short-term measurements in the steam system and condensate system of the dryer section and to use these measurements for the control and regulation of the process, with the pumps and switch-off valves simply being controlled in the main steam line which leads to the dryer section.
Known apparatuses and methods are for example described in “Das Papier” (The Paper) no. 12, 1995, p.771-775, in “TAPPI Proceedings 1992 Engineering Conference”, p.629-638 and also p.639-654 and in “Pulp & Paper Canada”, 98:12(1977), p.111-113. A measuring system for the determination of the moisture content of a fibre material web is known from the German patent application 19844927.5 with the filing date Sep. 30, 1998, in which the measurement takes place where the fibre web lies on a substantially water-free, co-moving surface. A known apparatus for the measurement of, for example, the moisture content of a paper web is the instrument “INFRAGAUGE PRO” of the company Infrared Engineering.
SUMMARY OF THE INVENTION
The invention therefore provides a method and also a measuring system of the initially named kind with which a picture can be obtained of the manufacturing process as accurately as possible, in particular in a paper making machine, and which in particular enables changes to be made in the manufacturing process for its optimization or change in targeted manner.
The invention provides that process data concerning at least one measured parameter which relates to a manufacturing process is detected and jointly evaluated in the region of at least one machine section, in particular of the dryer section of a paper making machine, with the detection of the process data taking place at a plurality of measurement zones which are arranged in series in the process direction.
The invention makes it possible to obtain many pieces of information concerning the manufacturing process, at least with respect to the respective machine section. In this way, a substantially more accurate picture of the process or process section results which enables a better understanding of the influence of the individual machine components on the manufacturing process in a complex machine, such as, for example, in a paper making machine. The provision of a plurality of measurement zones arranged in series, which can each include several individual measurement positions, makes it possible to obtain information from such positions of the machine through which the material web moves in time sequence. Thus, for example, by measuring the moisture content of a paper web moving through a dryer section of a paper making machine, the time-dependent course of drying, and thus the influence of the individual components of the dryer section on the paper web can be investigated in detail. The joint evaluation of the process data deleted at the individual measurement zones arranged in series enables an integrated consideration of all measurements and serves in this manner for an improved understanding of the respective machine section. By taking account of the web speed or process speed, individual points on the material path can be followed on their route through the respective machine section. The time-dependent course of the respectively investigated measured parameter can thus be found with a high accuracy. By providing a large number of measurement zones arranged in series and/or by interpolation between the individual process data obtained at measurement zones spaced apart in the process direction it is thus possible to obtain continuous or quasi continuous longitudinal profiles of the respective measured parameter. Furthermore, the process data found in accordance with the invention can be used for the formation and/or the optimisation of mathematical models which at least describe the respective machine section. Since, in accordance with the invention, the respective measured parameter can be obtained spatially resolved in the process direction, as a result of the measured zones being arranged in series, disturbances, for example as a result of defective machine components, for example of a dryer cylinder, can be precisely localised. This enables faults to be overcome considerably more quickly.
In accordance with a preferred embodiment of the invention, the detection of process data takes place at least substantially simultaneously with respect to at least some measurement zones.
In this way, a large quantity of data is simultaneously available concerning different zones of the machine so that the data can be simultaneously evaluated directly following its detection. Through the use of fast computers, rapid on-line control or regulation of the machine can be carried out on the basis of established data.
In accordance with a further preferred embodiment of the invention, the detection of process data takes place in the vicinity of part sections in which machine settings can be changed, in particular by control and/or regulation of machine components.
Thus, by way of example, a measurement zone or a measurement position can be provided directly after a dryer system or of a group of dryer cylinders in the process direction, so that the influence of changes in the settings of the dryer cylinder or cylinders can be read off from the process data and can consequently by recognised at once. By providing a closed regulating circuit, the relevant machine section or part section can as a consequence by ideally set up in the shortest possible time. It is also possible to provide a measurement zone or a measurement location directly before the respective machine section or part section or before a specific machine component, in order to allow the initial conditions prevailing directly in front of this section to enter into the assessment of the respectively investigated section.
In accordance with a further preferred embodiment of the invention, process data are detected concerning a plurality of different measured parameters.
In this way, the manner of operation of the respective machine section or part section can be pictured in a more detailed manner through the process data that is obtained, so that—if necessary—action can be taken in the manufacturing process in a more differentiated manner. The data detection of the different measured parameters preferably also takes place at least substantially simultaneously in order to obtain a fast and accurate overview of the machine with respect to the investigated secti
Oechsle Markus
Wegehaupt Frank
Chin Peter
Greenblum & Bernstein P.L.C.
Halpern Mark
Voith Paper Patent GmbH
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