EP0799348B1 - Verfahren zur erfassung und beeinflussung der querprofile bestimmter eigenschaften von papierbahnen und zugehörige anordnung - Google Patents
Verfahren zur erfassung und beeinflussung der querprofile bestimmter eigenschaften von papierbahnen und zugehörige anordnung Download PDFInfo
- Publication number
- EP0799348B1 EP0799348B1 EP95940956A EP95940956A EP0799348B1 EP 0799348 B1 EP0799348 B1 EP 0799348B1 EP 95940956 A EP95940956 A EP 95940956A EP 95940956 A EP95940956 A EP 95940956A EP 0799348 B1 EP0799348 B1 EP 0799348B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- paper
- fibre orientation
- paper web
- formation
- fiber orientation
- 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.)
- Expired - Lifetime
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Images
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
- D21G9/0027—Paper-making control systems controlling the forming section
Definitions
- the invention relates to a method for detection and influencing the cross profiles of certain properties of paper webs, such as in particular fiber orientation or Formation, opacity, basis weight and / or shrinkage.
- the invention also relates to the associated one Arrangement for performing this method of use in paper machines.
- the quality of paper is uniformity the paper properties across the production direction essential.
- the location-dependent courses of the paper properties transverse profiles to the production direction are called.
- Monitoring and regulation of paper properties require a measurement of these cross profiles.
- EP-A-0 408 894 describes a method for regulating and online measurement of fiber orientation in a photoconductive Paper web of a paper machine known in which a cross profile the fiber orientation is specified as the setpoint, the basis weight is measured continuously and by change of the local basis weight the cross profile of the fiber orientation is adapted to the setpoint curve. So can the cross profile of the fiber orientation by controlling the Adjustment spindles on the headbox while changing the basis weight of the paper optimized. Furthermore, from the JP-A-3037556 an arrangement for measuring paper quality known, in which the fiber orientation measured optically, the Video images are digitized and through a frequency analysis the digital images a curve for the ratio the fiber shares in the paper running direction and paper cross direction is obtained.
- the object of the invention is therefore to improve the Setting at least the cross profile of the fiber orientation propose and create an associated arrangement.
- the object is achieved in that at least the fiber orientation is continuously quantitatively measured and to control the cross profile of the fiber orientation via the Paper web used in the operation of a paper machine the cross profile of the fiber orientation is independent is influenced by the cross section of the basis weight. Possibly in addition to the fiber orientation at the same time Formation, opacity, basis weight and / or shrinkage measured and their cross profiles determined.
- a measuring head traversing over the paper web is used, which, in addition to specific sensors, an optical camera having. Such a camera is in particular a so-called CCD camera.
- the one obtained from the measuring head Signals a control loop for fiber orientation to control the fiber orientation cross profile on the headbox the paper machine operated, such a control loop from a so-called formation controller, a unit for the so-called mapping of the paper web, a controlled system and a unit with associated sensors.
- 1 denotes a paper web with the Width b, which differs from the headbox one in the figures not shown in detail in the x-direction paper machine moved as the paper travel direction.
- the width b of the paper web 1 can be between 3 and 10 m and in particular 5 m.
- the speed of the paper web in the x direction is for example 1500 m / min.
- the measuring head 10 For capturing cross profiles of certain properties of the Paper web 1 becomes the measuring head 10 over the finished paper web 1 back to a coil immediately before it is wound up moved. The measuring head 10 thus performs one over time t traversing movement. Because of the relative movement of the The measuring head 10 places paper web 1 in the x direction as a whole a zigzag path back on the paper web 1.
- the measuring head 10 usually contains a plurality of sensors known from the prior art, which are not dealt with in detail here.
- An optical camera 11 is specifically added to the sensors already present in the measuring head 10.
- optical camera a so-called CCD camera (c harge c oupled d evice) is advantageously used with electronic memories.
- the specified properties have the following meanings:
- the fiber orientation is essential for the degree fiber crosslinking in the paper web. Because the fiber networking determines the strength of the paper web 1, one often tries to on the one hand a good one and on the other hand an even one To achieve fiber cross-linking. In certain cases you would also like a preferred direction for fiber orientation give in order to achieve certain mechanical properties. To do this, the fiber orientation must be local to the individual Paper web 1 can be detected and influenced.
- FIG. 3 shows a measurement result for a paper web medium fiber orientation shown. It is on the Abscissa of the angle of the fiber orientation and on the The relative frequency is plotted on the ordinate.
- the angle of 90 ° points in the machine direction (MR) that Angles 0 and 180 ° point in the relevant transverse direction (QR) perpendicular to it.
- the anisotropy factor results as a ratio of the frequency in the machine direction MR to Frequency in the transverse direction QR. Is the fiber orientation for all angles are the same, the anisotropy factor is 1.
- the anisotropy factor is> 1; for example 1.5, which means that a preferred direction of Fiber orientation in the running direction of the paper web 1 exists.
- the degree of Fiber orientation and / or cross-linking by one at the Camera recording determined locally performed pattern recognition. Neural networks, for example, are suitable for this.
- the formation is the small-scale non-uniform Distribution of the fiber mass in the paper web 1 with in places Accumulation or dilution. In practice can be due to a so-called cloudiness when looking through of the paper in front of a brightly lit surface.
- the formation can therefore also be optically detected, where there is a connection with the fiber orientation can.
- Opacity is the translucency of paper. It is determined by a light transmission measurement, where the intensity of what has penetrated through the paper Light is measured. For this measurement is compared the camera 11 on the other paper side of the paper web 1 a light source attached. The latter is over in detail FIG. 2 shows that the measuring head 10 with the camera 11 traversed back and forth and a unit 15 with a light source below the paper web 1 corresponding executes traversing movements.
- the weight per unit area is the mass per unit area of the paper web 1, this size being given in g / m 2 .
- the basis weight cross section can also be determined by a light transmission measurement with the camera 11. Usually, the absolute value of the basis weight is not recorded, but only the mean-free course of the basis weight cross profile is reproduced on the basis of the fluctuations in brightness.
- the shrinkage inevitably arises in papermaking: In the drying area of the paper machine, the Paper mass withdrawn water by the paper web 1 over with Steam heated metal rollers is guided. By drying an uneven shrinkage of the paper web 1 result over its width b. If the actuators for Basis weight and fiber orientation before the drying section the shrinkage undesirably changes the Places of action of these actuators.
- a regulation of the fiber orientation cross profile on the Paper web 1 requires knowledge of the assignment of each Actuator to its place of action in the finished paper. This Mapping is usually called "mapping". Through the traversing camera 11 can take an overall picture of the entire width of the paper web 1 can be achieved. In stochastic Irregularities on the top of the paper web 1 contains the impression of regular sieve markings.
- Measuring head 10 with camera 11 results in suitable trained headboxes the opportunity to exactly determined cross profiles independently of each other influence and correct. Now you can choose suitable ones Actuators for specifying the fiber orientation cross profile, that measured according to Figures 1 and 2 and online by Pattern recognition is evaluated, use. The presence of actuators and sensors thus enables Setup of a control device for the relevant cross profile for practical use in paper machines.
- Figure 4 there is a complete control loop 3 for fiber orientation specifically from a fiber orientation controller 31, a mapping unit 32, an actuator 33, one Control path 34 and a sensor unit 35. These units are only shown schematically (“black boxes”), the signal feedback to the comparison point 30 takes place.
- the continuous measurement of fiber orientation is one Feedback of the determined cross profile signals and activation to a controller comparison point 30 possible. This is taken into account equally the mapping function of the unit 32 the change in assignment caused by shrinkage of actuator 33 to the related actuator effect.
Landscapes
- Paper (AREA)
Description
- Figur 1
- die Draufsicht auf eine Papierbahn mit einem zugehörigen Meßkopf zur Vermessung,
- Figur 2
- in Seitenansicht das Prinzip einer Lichttransmissionsmessung mit zusätzlicher Lichtquelle,
- Figur 3
- ein Diagramm zur Definition der Faserorientierung bei Papierbahnen sowie der diesbezüglichen Meßgröße und
- Figur 4
- ein Blockschaltbild eines Formationsregelkreises.
- Faserorientierung
- Formation
- Opazitat und Flachengewicht
- Schrumpfung.
Claims (10)
- Verfahren zur Erfassung und Beeinflussung von Querprofilen bestimmter Eigenschaften von Papierbahnen, wie insbesondere Faserorientierung bzw. Formation, Opazität, Flächengewicht und Schrumpfung, dadurch gekennzeichnet, daß zumindest die Faserorientierung der Papierbahn fortlaufend quantitativ gemessen und zur Regelung des Querprofils der Faserorientierung über die Papierbahn beim Betrieb einer Papiermaschine herangezogen wird, wobei das Querprofil der Faserorientierung unabhängig vom Querprofil des Flächengewichtes beeinflußt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß neben der Faserorientierung und Flächengewicht gleichermaßen Formation, Opazität und Schrumpfung der Papierbahn gemessen und deren Querprofile bestimmt werden.
- Verfahren nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, daß ein über die Papierbahn traversierender Meßkopf verwendet wird, der neben spezifischen Sensoren eine optische Kamera aufweist.
- Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß als Kamera eine sog. CCD-Kamera verwendet wird.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß zur quantitativen Messung der Faserorientierung und/oder Formation eine Mustererkennung der Kameraaufnahmen durchgeführt wird.
- Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß die Mustererkennung mittels neuronaler Netze erfolgt.
- Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß der Regeleingriff am Stoffauflauf der Papiermaschine erfolgt.
- Verfahren nach Anspruch 7 und 8, dadurch gekennzeichnet, daß als Stellglied für die Faserorientierung ein Aktor zur Formationsbeeinflussung verwendet wird.
- Anordnung zur Durchführung des Verfahrens nach Anspruch 1 oder einem der Ansprüche 2 bis 9 zur Verwendung bei Papiermaschinen, wobei eine Regeleinheit zur Regelung des Querprofils der Faserorientierung am Stoffauflauf der Papiermaschine vorhanden ist, dadurch gekennzeichnet, daß der Regelkreis (3) aus einem Regler (31) für die Faserorientierung, einer Einheit (32) zum sog. Mapping der Papierbahn (1), einem Stellglied (33), einer Regelstrecke (34) und einer Einheit mit zugehöriger Sensorik (35) besteht.
- Anordnung nach Anspruch 11, dadurch gekennzeichnet, daß Faserorientierungregler (31), Einheit zum Mapping (32), Stellglied (33), Regelstrecke (34) und Sensorik (35) hintereinandergeschaltet sind und daß deren Ausgangssignal auf den Reglervergleichspunkt (30) des Regelkreises (3) zurückgekoppelt ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4445260 | 1994-12-19 | ||
DE4445260 | 1994-12-19 | ||
PCT/DE1995/001791 WO1996019615A1 (de) | 1994-12-19 | 1995-12-14 | Verfahren zur erfassung und beeinflussung der querprofile bestimmter eigenschaften von papierbahnen und zugehörige anordnung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0799348A1 EP0799348A1 (de) | 1997-10-08 |
EP0799348B1 true EP0799348B1 (de) | 1999-05-12 |
Family
ID=6536248
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95940956A Expired - Lifetime EP0799348B1 (de) | 1994-12-19 | 1995-12-14 | Verfahren zur erfassung und beeinflussung der querprofile bestimmter eigenschaften von papierbahnen und zugehörige anordnung |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0799348B1 (de) |
AT (1) | ATE180026T1 (de) |
DE (1) | DE59505937D1 (de) |
FI (1) | FI972576A0 (de) |
WO (1) | WO1996019615A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19634997C2 (de) * | 1996-08-30 | 1999-08-05 | Voith Sulzer Papiermasch Gmbh | Regeleinrichtung mit einer Sensoren-Mehrzahl |
DE19653477C2 (de) * | 1996-12-20 | 1999-04-22 | Siemens Ag | Verfahren und Vorrichtung zur Prozeßführung bei der Herstellung von Papier |
CN1272918A (zh) * | 1998-04-23 | 2000-11-08 | 伊索福圣戈班公司 | 确定矿棉垫纤维结构方向的方法 |
DE19843729A1 (de) | 1998-09-24 | 2000-03-30 | Voith Sulzer Papiertech Patent | Verfahren und Vorrichtung zur Verbesserung des Schrumpfungs-Querprofils |
GB2342457A (en) * | 1998-10-07 | 2000-04-12 | John Clark | A quality control sampling system with barcode reader and video camera |
US6799083B2 (en) * | 2002-02-21 | 2004-09-28 | Abb Inc. | On-line fiber orientation closed-loop control |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI75887C (fi) * | 1986-12-30 | 1991-03-06 | Antti Johannes Niemi | Foerfarande och apparatur foer kontroll av torrlinjen pao planvirapappersmaskin. |
DE3827084C1 (de) * | 1988-08-10 | 1989-11-16 | Sulzer-Escher Wyss Gmbh, 7980 Ravensburg, De | |
FI85731C (fi) * | 1989-06-01 | 1997-08-20 | Valmet Paper Machinery Inc | Reglersystem i en pappers- eller kartongmaskin |
JPH0337556A (ja) * | 1989-07-05 | 1991-02-18 | Mitsubishi Heavy Ind Ltd | 紙質測定装置 |
FI81848C (fi) * | 1989-07-17 | 1990-12-10 | Valmet Paper Machinery Inc | Foerfarande foer reglering och on-line maetning av fiberorienteringen av en bana som framstaells pao en pappersmaskin. |
DE4005281C2 (de) * | 1990-02-20 | 1995-04-06 | Schultz Hans Joachim Dr Ing | Stoffauflauf mit Regelung des Flächengewicht-Querprofiles über die Verdünnung der Fasersuspension |
DE4008282A1 (de) * | 1990-03-15 | 1991-09-19 | Voith Gmbh J M | Massnahmen zur erfassung der schrumpfung oder dehnung von warenbahnen |
FI88182C (fi) * | 1991-05-23 | 1993-04-13 | Antti Johannes Niemi | Foerfarande och anordning foer kontroll av torrlinjen och foer pao torrlinjen baserad reglering i en planvirapappersmaskin |
DE4221031C2 (de) * | 1992-06-26 | 1995-08-24 | Voith Gmbh J M | Einrichtung zur Dickenmessung von dünnen fortbewegten Substraten |
-
1995
- 1995-12-14 DE DE59505937T patent/DE59505937D1/de not_active Expired - Lifetime
- 1995-12-14 AT AT95940956T patent/ATE180026T1/de active
- 1995-12-14 WO PCT/DE1995/001791 patent/WO1996019615A1/de active IP Right Grant
- 1995-12-14 EP EP95940956A patent/EP0799348B1/de not_active Expired - Lifetime
-
1997
- 1997-06-17 FI FI972576A patent/FI972576A0/fi not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
FI972576A (fi) | 1997-06-17 |
WO1996019615A1 (de) | 1996-06-27 |
DE59505937D1 (de) | 1999-06-17 |
ATE180026T1 (de) | 1999-05-15 |
EP0799348A1 (de) | 1997-10-08 |
FI972576A0 (fi) | 1997-06-17 |
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