Boots – shoes – and leggings
Patent
1996-05-31
1998-07-14
Ruggiero, Joseph
Boots, shoes, and leggings
162263, 162DIG10, 364150, 36447103, C08F 1900
Patent
active
057814406
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method and a device for monitoring the cross-sectional profile of a continuously produced web of material.
BACKGROUND INFORMATION
In many processes where continuous webs of material are produced, it is of interest to provide products such as, for example, paper webs or foils with the most uniform possible characteristics; thus, these products should be homogenous and of a consistent quality. To obtain the relevant material characteristics, e.g., thickness, specific weight, or moisture content (having a numerical representation), the characteristics are measured in the longitudinal and transversal directions of the web of material and are represented as a profile in these directions. The cross-sectional profile is normally obtained broken down into a number of measured values, where the profile is average-free or is made average-free. It is desirable for the measured profile to correspond to a predefined reference profile, the reference profile is often being a zero. To achieve the desired correspondence, a predefined number of actuators, driven by a control system as a function of the system deviation between the given reference profile and the measured profile, is placed transversally to the material web.
An apparatus having a control device in which the actual cross-sectional profile control is optimized, is shown in U.S. Pat. No. 5,170,357.
It is possible that a cross-sectional profile cannot be given all desired shapes with a finite number of actuators. In particular, absolute smoothness cannot be achieved. Accordingly, it is questionable as to what extent the reference profile can be approximated by controlling the cross-sectional profile.
An article, R. Munch, "Der JETCOmmander--ein fortschrittliches System zur Fernverstellung der Stoffauflaufblende und zur Regelung des Flachengewicht-Querprofils" (The JETCOmmander--an advanced system for remote adjustment of the material winding aperture and control of the surface weight cross-sectional profile) Wockenblatt fuer Papierfabrikation 7, 1992, pp. 259-265, illustrates a process for estimating the improvement potential when a surface weight cross-sectional profile on a papermaking machine is controlled, where the variance of the measured profile is broken down into its wavelength components from which the improvement potential of the measured profile is estimated. In such a process, the accuracy of the estimate is limited since the optimum achievable profile is unknown.
In contrast, the object of the present invention is to provide a process and design means to improve the evaluation of the control devices for cross-sectional profiles of continuously produced material webs.
SUMMARY OF THE INVENTION
The present invention relates to a method and a device, wherein the optimally achievable profile is calculated in a computing device as a function of the measured profile and a mathematical model of the controlled system and made available for comparison with the measured profile for cross-sectional profile control with a control device, to whose input the system deviation between a predefined reference profile and the measured profile are supplied, and which actuates, at its output, a predefined number of actuators as a function of the system deviation to adjust the profile of the material web.
An advantage of the method and device according to the present invention consists of determining the actually desired, optimally achievable, profile first, where the profile is not constant and is dependent on the profile measurements. By comparing to the measured profile, a highly graphic evaluation tool is provided for estimating the possible profile improvement.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a block diagram of a device for executing the method according to the present invention.
FIG. 2 shows a structure of a control circuit for controlling cross-sectional profiles as shown in FIG. 1 according to the present invention.
FIGS. 3-6 show possible representations of measured and correspond
REFERENCES:
patent: 3671726 (1972-06-01), Kerr
patent: 3936665 (1976-02-01), Donoghue
patent: 3953713 (1976-04-01), De Light
patent: 4151588 (1979-04-01), Hammer
patent: 4855941 (1989-08-01), Berruyer
patent: 4874467 (1989-10-01), Karlsson et al.
patent: 4931982 (1990-06-01), Hayashida et al.
patent: 5170357 (1992-12-01), Sasaki et al.
patent: 5381341 (1995-01-01), Herrala et al.
R. Munch: "Der JETCOmmander--ein fortschrittliches System zur Fernverstellung der Stoffauflaufblende und zur Regelung des Flachengewicht-Querprofils", Wochenblatt fur Papierfabrikation 7, 1992, pp. 259-265.
Ruggiero Joseph
Siemens Aktiengesellschaft
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