EP0963481A1 - Method for designing and/or visualizing at least one roll/ felt pair in a paper or carton making machine press - Google Patents
Method for designing and/or visualizing at least one roll/ felt pair in a paper or carton making machine pressInfo
- Publication number
- EP0963481A1 EP0963481A1 EP97907059A EP97907059A EP0963481A1 EP 0963481 A1 EP0963481 A1 EP 0963481A1 EP 97907059 A EP97907059 A EP 97907059A EP 97907059 A EP97907059 A EP 97907059A EP 0963481 A1 EP0963481 A1 EP 0963481A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- felt
- press
- parameters
- machine
- roller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000004364 calculation method Methods 0.000 claims abstract description 22
- 239000000123 paper Substances 0.000 claims description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 230000008859 change Effects 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 20
- 239000004744 fabric Substances 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 8
- 239000011111 cardboard Substances 0.000 claims description 6
- 239000011087 paperboard Substances 0.000 claims description 6
- 230000000717 retained effect Effects 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 5
- 238000004088 simulation Methods 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 2
- 230000035699 permeability Effects 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 238000009825 accumulation Methods 0.000 claims 1
- 238000004140 cleaning Methods 0.000 claims 1
- 238000001816 cooling Methods 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 8
- 238000012986 modification Methods 0.000 abstract description 3
- 230000004048 modification Effects 0.000 abstract description 3
- 238000001035 drying Methods 0.000 description 11
- 230000003993 interaction Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000012544 monitoring process Methods 0.000 description 7
- 238000012800 visualization Methods 0.000 description 5
- 238000011109 contamination Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000012938 design process Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 229920000034 Plastomer Polymers 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010230 functional analysis Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0009—Paper-making control systems
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S715/00—Data processing: presentation processing of document, operator interface processing, and screen saver display processing
- Y10S715/961—Operator interface with visual structure or function dictated by intended use
Definitions
- the invention relates to a method for designing and / or visualizing at least one roller / felt pairing in the wet press of a paper or board machine.
- DE 38 35 641 AI discloses a method for controlling and / or monitoring the drying process of a paper or cardboard web.
- the air distribution system of a so-called Yankee cylinder is divided into three, with a computer being used to control the drying process.
- the control and monitoring of the Yankee cylinder drying process is based on an online simulation program, which aims to achieve better paper quality and more effective drying in terms of both energy consumption and the actual drying process.
- a process model is used for this, which was set up on the basis of test runs, online measurements and / or drying theory. Setpoint parameters corresponding to the types of railway to be traveled are entered into the process model from a so-called sort or recipe file, and in certain time periods the simulation program is provided with new output values which are provided by sensors of the drying process.
- the known simulation program thus calculates the dry content as well as the temperature of the paper and the energy consumption of the individual drying segments from the initial data, eg evaporation performance for the web to be dried from each segment.
- the speed, humidity and temperature of the blowing air can be determined.
- paper machines with drainage elements are known, which comprise wet press felts, dryer fabrics and rollers.
- the paper or cardboard web is deliberately dewatered by means of so-called wet pressing, the respective machine clothing being decisive with regard to the quality of the products obtained, the smooth running of the press and the service life of the felts.
- the behavior of the clothing in the press depends on the defined roller configuration, which in turn interacts with the felt material.
- roller / felt pairings in wet presses are extremely complex, with contamination of the felt during operation resulting in undesirable and unpredictable quality changes or undesirable productivity restrictions when operating the paper machines.
- Previously known design methods for the creation of an optimal pair of rollers and felt rely on sometimes complex test runs and on-site variant tests necessary for the customer, which are, however, very time-consuming and cost-intensive.
- the method according to the invention it should be possible to make application-technical decisions in a shorter time, in which case applications can be predicted, visualized and tested directly on site, for example when advising customers or on existing systems.
- the invention is also intended to provide an analysis tender problems can be carried out quickly and inexpensively.
- the calculation steps are shifted to the background, especially when there are changed input parameters, but the necessary arithmetic operations are carried out almost simultaneously, so that for the analysis, including process-related, the changed parameters are fed back to the drainage system. capacity and the operating behavior of the wet press can be called up at any time.
- the current configuration to be designed or visualized is selected from a set of press configurations offered, the respective application and the desired paper or cardboard quality being additionally used as the selection criterion.
- a press i.e. a roller / felt pairing is selected, relevant output machine and roller parameters of the selected press being read and displayed in the internal database.
- the method according to the invention is suitable for online process control and can therefore also be used for the continuous monitoring and control of wet presses in paper or board machines.
- relevant felt parameters that can be assigned are already read out from or into the standard database by reading out or re-entering machine and roller parameters. This reading of felt parameters or also the calculation of sizes that characterize the drainage behavior takes place in the background. By means of this background calculation, it is possible to minimize the amount of image data required for visualization on the one hand and on the other hand the link between the properties of the roller necessary for the presentation of the results in good time and felt, ie to have the specific roller and felt pairing available.
- a continuous change and specification of machine, roller and / or roller / felt parameters takes place automatically with the aim that a roller / felt pairing and / or a felt fleece structure can be specified for a specific press configuration , which is identified by a predetermined, maximum drainage capacity.
- a calculation cycle is initiated on the input side, the design procedure being reached by the computer system until it is reached Grenz of limit values or limit loads is carried out automatically and the results obtained are displayed.
- the standard database based on experience or previously calculated values contains linked presetting data for all press configurations, which, however, can be changed in the analysis or design process in relation to the roller / felt pairing. It is within the meaning of the invention that starting from new machine, fabric, roller and / or felt parameters, values obtained by calculation, which are characteristic of the respective pairing, can be stored as new standard data and can be included in the standard database. The creation of new standard data can be realized by updating in the sense of performing self-learning steps.
- the product-related results are displayed in a first matching form, the water-related results in a second matching form and the changeable input parameters in a third matching form to show the drainage behavior of the respective press.
- the display side can be changed as desired, whereby the original input values of the respective press are retained.
- a targeted change of the material or machine parameters can be done both from the roll as well as from the felt analysis, i.e. after calling up the respective submenu.
- the system starts with a system proposal for the new roller / felt pairing, whereby essential machine and material parameters are adopted. These parameters, in particular the machine speed, paper quality, material temperature and other material parameters, are retained for all presses in the configuration until a modification of these superordinate influencing parameters is carried out.
- the method makes it particularly easy to determine the effects on the final dry content of the paper or cardboard that an increase in the material temperature, a change in line load, a change in machine speed, material input or grinding degree. Immediate visualization of the effects of an increase in speed, e.g. based on the loss of dry matter possible.
- a further advantage of the method lies in the process-related simulation of the behavior of the roller / felt pairing, in particular the long-term behavior of the felt, taking into account the contamination of the surface of the felt, so that the period of the maximum felt performance and the time of maintenance work can already be determined. before one 9
- boundary conditions are in particular a maximum press pressure, which results from the properties of, for example, elastomeric roll covers, a negative water balance or an excessive flow resistance in the felt, which can lead to hydraulic overloading with the result of vibrations, short felt running times and felt breaks.
- Fig. 1 shows the image of the opening or main menu
- Fig. 2 to 8 screen representations of the roll analysis with symbolic link between influencing parameters and results as well
- the main menu shown in FIG. 1 shows frequent uses of different press configurations, the paper quality of the standard setting being additionally indicated in the respective press image.
- the type of press is specified in the field below the respective press image, for example Trinip, Tvinver, Trivent, compact, tissue, shoe and laying presses are listed.
- the respective designation field enables the relevant menu to be opened by clicking on it, for example with a computer mouse. You can also from the main menu both language and the measurement system to be used can be selected.
- the specific press configuration is then selected via the main menu, e.g. Trinip, whereby in a next step the respective press can be selected and the running direction can be selected.
- a worksheet for roll analysis results which, in addition to relevant customer information, includes an internal name, in the specific case "paper machine 1, first press".
- the material parameters, ie the properties of the pulp, are shown in the upper right menu picture, the abbreviations AP for waste paper and TMP for thermo-mechanical pulp.
- the specification of the fillers refers to the use of kaolin, CaO, CaC0 3 or similar.
- the sizes specified in the machine parameters field include a paper machine speed in m / min as an analog pointer display with digital numerical display, the line load (LL) being shown in kN / m using a bar chart with a movable pointer.
- the analog pointer display is used for the paper machine speed, which is supplemented by the mentioned digital numerical display.
- the situation is similar with the machine parameter line load, which is represented both digitally and by a bar with pointer.
- the machine parameter line load which is represented both digitally and by a bar with pointer.
- the paper quality at / O shown example "Newsprint” the paper weight in g / m 2 , the dry input content in% and the fabric temperature, ie the temperature of the fiber-water mixture at the press inlet shown. ' -
- the roller parameters include the reference length in meters, the number of nips and column-like information on the top and bottom rollers. Two nips are assumed for double suction press rolls.
- the reference type of the top roller in the exemplary embodiment is polyurethane, and the bottom roller is steel.
- the reference length corresponds essentially to the roll length, DM being the diameter of the roll, including the reference thickness. Grooves and webs, as well as depth and blind bore diameter, as well as the open blind bore area, are decisive for water transport capacity and are therefore given. In addition, there is a percentage of the open area of the suction holes, the program calculating the sum of the open area per roller and the H 2 0 (water) storage volume per roller. The storage volume is specified in milliliters per square meter.
- the size "Trg.A (%)” denotes the calculated outlet dry content.
- H 2 0 made of paper denotes the amount of water squeezed out of the paper or the paper web.
- Ges. ⁇ O in milliliters per square meter gives the total amount of water / / an and “Ges.Spv” in milliliters per square meter denotes the total storage volume of rollers and felts in the pressed state.
- “H 2 0 difference” indicates the difference between the storage volume and the total amount of water, and if the total water balance is negative, the display changes to flashing, so that the exceeding of a limit condition can be easily recognized.
- the results from gap width to press pulse which are also given, characterize standard computation results for press rolls and provide comparison parameters for the possible use of modified rolls.
- the displayed temperature development of the roller represents a measure of the thermal energy which is released, for example, by internal friction during deformation and flexing work of the roller.
- the specification of the coolant quantity 1 / min is based on the thermal energy to be dissipated and takes into account the desired homogeneous temperature profile over the roll length.
- FIGS. 2 to 8 are intended to show the influences or interactions between the machine and material parameters on the one hand and the results obtained with the respective roller on the other. These connecting lines are for illustration only, i.e. they are not displayed on the monitor of the computer system.
- the arrow representations also indicate the change direction of the respective parameter or the respective result.
- the outlet dry content is reduced, ie the amount of water squeezed out of the paper and thus both the total storage volume as well as the total amount of water and the H 2 O difference become smaller.
- An increase in the machine speed ie an increase in speed, also leads to increasing flexing work in the roller, which in turn leads to an increase in temperature.
- FIG. 3 shows the influence of increased line load on the results of the roll analysis
- FIG. 4 shows the effects of a changed paper weight, changed input dry content and changed material temperature.
- the effects of the pulp parameters on the dewatering capacity is shown in FIG. 5.
- Fig. 6 serves as a symbolic explanation when the hardness of the roll cover changes or the influence of a changing reference thickness of the roll. The same applies to FIGS. 7 and 8, the latter clarifying to what extent the drainage capacity can be varied by constructive measures in the formation of water-absorbing grooves, webs and blind bores.
- machine and / or roll parameters of the selected press can now be changed, whereby the change in the dewatering behavior of the roll / felt pairing of the press due to the parameter changes is continuously recalculated and, as explained, is at least partially displayed as a trend display .
- the results can be switched between roller and felt analysis by simultaneous availability of the calculation results, with fields to be repeated in each result display Change and specification of machine and roller parameters or machine and felt parameters are provided.
- All machine and roller parameters can be changed.At the same time, the respective parameter fields can be accessed with a mouse and the pointer or bar for machine speed or line load can be dragged to higher or lower values. Of course, it is also possible to enter new parameters by entering a specific sequence of digits.
- the screen images of the felt analysis symbolically represented in FIGS. 9 to 16 show a similarly clear structuring and division into machine parameters as well as product information regarding top and bottom felt and the associated results.
- results such as discharge dry matter content, amount of water squeezed out of the paper web, total storage volume and total water volume as well as the control variable total water balance are displayed and readable.
- a particular advantage of the described method lies in the fact that both felt and roller changes can be fully simulated close to the process, whereby the adoption of machine and fabric parameters for a specific press configuration enables the expected, ie simulated results to be specified extremely quickly, so that the method can be carried out can also be used for direct control and monitoring of a paper machine.
- the calculated results are preferably displayed on a monitor of the computer system in different graphical and / or color form, the product-related results in a first matching form, e.g. with red bars, the water-related results in a second matching form, e.g. with blue bars, and the changeable input parameters in a third matching form, e.g. black text on white fields.
- FIGS. 9 to 16 The felt analysis carried out with FIGS. 9 to 16 with regard to their linking parameters and influencing effects (connecting lines and arrow representations) will also be described below.
- the top section of the screen shows the specific paper machine and pulp parameters.
- the machine speed and the line load as well as selected material parameters meters, whereby reference is made here to the explanations for the roll analysis.
- the Scanpro values are measured values that are obtained, for example, with a so-called Scanpro press tuner.
- the information felt g / m 2 refers to the calculated total weight of the felt and the information GG g / m 2 to the calculated basic fabric weight.
- the number of needles corresponds to the respective standard setting of the given system, denier denoting the fiber mixtures. For example, “% l.Fa” is the percentage of the first fiber.
- “Lag” refers to the number of nonwoven layers per mixture and "G / Lag” the weight per layer of a mixture.
- RS vacuum refers to the measured pipe suction vacuum value when the paper machine starts up.
- the expected calculated runtime of the felt in days is verified with the bar pointer diagram "Days”. This calculated runtime result is available in the respective result blocks or is displayed there.
- the felt quotient results from the measured value Scanpro per total felt weight.
- H20 Vol. New corresponds to the storage volume of the new base fabric under a given line load, with “H20 running days” indicating the storage volume of the base fabric over the course of the runtime.
- Period in l / m 2 * min relates to the water permeability of the press felt, which changes over the running time.
- the flow resistance of the press felt is also time-dependent and increases, for example, due to contamination of the felt. At this point it should be noted that the flow resistance is one of the boundary conditions in the dewatering process.
- the flow resistance in the felt depends, for example, on the fiber layering, the pre-compacting process, the fleece layer, the storage volume of the base fabric weight, the storage volume of the press roll in the course of the flow paths, the hydraulic pressure and the amount of water in the felt. If a situation arises where a short nip dwell time is no longer sufficient to drain the amount of water in the felt through the fleece or if the hydraulic design in the press nip is too high due to the flow paths being too long and the storage volume too low, then the rollers are too high / Felt pairing or the entire wet press system hydraulically overloaded. A timely detection of such overloads prevents unwanted vibrations, felt runtimes that are too short, and serves to detect impending felt tears at an early stage. This situation can be symbolized separately, for example, with a flashing display of the bar profile or the numerical display of the flow resistance.
- the drainage measures by means of a pipe suction device as well as the nip drainage serve not only to actually remove moisture, but also to clean the felt and remove dirt particles, so that the service life is increased.
- the felt analysis according to FIG. 9 shows the relationships with changing machine speeds in relation to the dewatering capacity and certain calculation results of the felt by the drawn connecting lines. 10 shows the interactions between increased line load and felt analysis calculation results as well as the drainage capacity.
- FIG. 15. 16 serves to explain in principle the interactions between typical parameters of the drainage capacity and the felt running time in days.
- the program can switch between roller and felt analysis as desired, whereby the input values and calculations already received are not affected, so that the most recently entered, most current values remain in the system.
- the fabric data or fabric parameters can be changed from both the roll and felt analysis.
- the method therefore makes it possible to determine the basic fabric weight as well as the total weight for felt types of very different types, to determine the storage volume of the felt under the operating load, to determine a change in storage volume related to runtime, and to indicate flow resistance due to flow change and runtime. It is also possible to determine whether and to what extent there is a change in the felt storage volume due to a change in the roller hardness. Ultimately, it is possible to carry out a water balance calculation in a simple manner, whereby the influence of nip dwell time and maximum pressure on the press felt can be discussed here. In an equally descriptive way, a comparison possibility of flow resistance in the felt and total storage volume in the press is given.
- the method according to the exemplary embodiment not only serves to select the optimum press configuration, but also enables an optimal determination of the pairing in terms of a corresponding material combination by means of a specific roller / felt analysis also within the press configuration.
- simulation steps ie observation of changes that may have been made or to be made or that occur, expected results can be determined in advance and used for control and / or monitoring tasks. If, for example, a negative total water balance occurs during the simulation, then by changing to the menu item "Change machine or Material parameters ", a targeted variation is carried out, all other parameters being retained, so that the interactions of the individual components of the press system are taken into account that come close to the real circumstances.
- an automatic, ongoing change and specification of machines / rollers and / or Machine / felt parameters the system automatically specify rollers / felt pairings and / or felt fleece structures with a specified maximum drainage capacity.
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP1997/001016 WO1998038383A1 (en) | 1997-02-28 | 1997-02-28 | Method for designing and/or visualizing at least one roll/ felt pair in a paper or carton making machine press |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0963481A1 true EP0963481A1 (en) | 1999-12-15 |
EP0963481B1 EP0963481B1 (en) | 2002-07-17 |
Family
ID=8166542
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97907059A Expired - Lifetime EP0963481B1 (en) | 1997-02-28 | 1997-02-28 | Method for designing and/or visualizing at least one roll/ felt pair in a paper or carton making machine press |
Country Status (7)
Country | Link |
---|---|
US (1) | US6778947B1 (en) |
EP (1) | EP0963481B1 (en) |
AT (1) | ATE220746T1 (en) |
AU (1) | AU1924797A (en) |
CA (1) | CA2283864A1 (en) |
DE (1) | DE59707751D1 (en) |
WO (1) | WO1998038383A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005015506A1 (en) * | 2005-04-05 | 2006-10-12 | Man Roland Druckmaschinen Ag | Press simulator |
DE102009028215B3 (en) | 2009-08-04 | 2010-09-09 | Voith Patent Gmbh | Combination of a press felt with a press roll cover and / or a suction roll cover for a paper machine |
EP3392405A1 (en) * | 2017-04-18 | 2018-10-24 | Siemens Aktiengesellschaft | Method for operating a paper machine, drive system and paper machine |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4427734A (en) * | 1982-04-19 | 1984-01-24 | Albany International Corp. | Wet press felt for papermaking machines |
DE3220622A1 (en) * | 1982-06-01 | 1983-12-15 | M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach | DATA INPUT DEVICE ON PRINTING MACHINES |
DE3336658A1 (en) * | 1983-10-08 | 1985-04-25 | Ingenioerfirma Peter Simonsen A/S, 6400 Soenderborg | SINGLE-SIDED CARDBOARD MACHINE |
SE463269B (en) * | 1984-04-11 | 1990-10-29 | Sensodec Oy | PROCEDURE AND DEVICE TO LOCATE ERRORS IN THE FUNCTION OF A PAPER MACHINE PARTS |
CA1292891C (en) * | 1986-05-20 | 1991-12-10 | Ivan I. Pikulik | Method and apparatus for measurement of the permeability to water |
CA1305235C (en) * | 1986-10-31 | 1992-07-14 | Bruce A. Reynolds | Cutoff control system |
US4984773A (en) * | 1987-10-06 | 1991-01-15 | Rockwell International Corporation | Method of and apparatus for composing a press imposition |
FI81628C (en) * | 1987-11-09 | 1990-11-12 | Valmet Paper Machinery Inc | FOERFARANDE VID STYRNINGEN OCH / ELLER KONTROLLEN AV EN TORKNINGSPROCESS SOM SKER MED EN YANKEE-CYLINDER. |
FI85731C (en) * | 1989-06-01 | 1997-08-20 | Valmet Paper Machinery Inc | Reglersystem i en pappers- eller kartonmaskin |
US5713396A (en) * | 1990-06-06 | 1998-02-03 | Asten, Inc. | Papermakers fabric with stacked machine and cross machine direction yarns |
US5135802A (en) * | 1991-12-06 | 1992-08-04 | Huyck Corporation | Absorber felt |
US6024835A (en) * | 1992-08-28 | 2000-02-15 | Fiore; Leonard F. | Quality control apparatus and method for paper mill |
JP3094798B2 (en) * | 1994-08-16 | 2000-10-03 | 王子製紙株式会社 | Method and apparatus for controlling product moisture at the time of exchanging paper machine |
DE29512758U1 (en) * | 1995-08-08 | 1995-10-19 | Heidelberger Druckmasch Ag | Cleaning device for cleaning cylinders of a printing press |
FI98843C (en) * | 1995-10-03 | 1997-08-25 | Valmet Corp | A method and apparatus for removing water from a paper or board web by compression |
US6077397A (en) * | 1996-10-23 | 2000-06-20 | Asten, Inc. | High support papermakers fabric |
US5891306A (en) * | 1996-12-13 | 1999-04-06 | Measurex Corporation | Electromagnetic field perturbation sensor and methods for measuring water content in sheetmaking systems |
US5853543A (en) * | 1997-01-27 | 1998-12-29 | Honeywell-Measurex Corporation | Method for monitoring and controlling water content in paper stock in a paper making machine |
-
1997
- 1997-02-28 US US09/380,238 patent/US6778947B1/en not_active Expired - Fee Related
- 1997-02-28 EP EP97907059A patent/EP0963481B1/en not_active Expired - Lifetime
- 1997-02-28 WO PCT/EP1997/001016 patent/WO1998038383A1/en active IP Right Grant
- 1997-02-28 AT AT97907059T patent/ATE220746T1/en not_active IP Right Cessation
- 1997-02-28 CA CA002283864A patent/CA2283864A1/en not_active Abandoned
- 1997-02-28 DE DE59707751T patent/DE59707751D1/en not_active Expired - Fee Related
- 1997-02-28 AU AU19247/97A patent/AU1924797A/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO9838383A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU1924797A (en) | 1998-09-18 |
DE59707751D1 (en) | 2002-08-22 |
ATE220746T1 (en) | 2002-08-15 |
WO1998038383A1 (en) | 1998-09-03 |
EP0963481B1 (en) | 2002-07-17 |
US6778947B1 (en) | 2004-08-17 |
CA2283864A1 (en) | 1998-09-03 |
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