EP0799348A1 - 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 anordnungInfo
- Publication number
- EP0799348A1 EP0799348A1 EP95940956A EP95940956A EP0799348A1 EP 0799348 A1 EP0799348 A1 EP 0799348A1 EP 95940956 A EP95940956 A EP 95940956A EP 95940956 A EP95940956 A EP 95940956A EP 0799348 A1 EP0799348 A1 EP 0799348A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fiber orientation
- paper
- paper web
- formation
- influencing
- 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
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 detecting 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 arrangement for carrying out this method for use in paper machines.
- the uniformity of the paper properties across the production direction is decisive for the quality of paper.
- the location-dependent profiles of the paper properties transversely to the direction of production are called cross profiles.
- the monitoring and regulation of the paper properties require a measurement of these cross profiles.
- the object of the invention is to create further improvements and to provide an associated arrangement.
- the object is achieved in that at least the fiber orientation is continuously quantitatively measured and used to regulate the cross profile of the fiber orientation over the paper web when operating a paper machine becomes. If necessary, in addition to the fiber orientation, formation, opacity, basis weight and / or shrinkage are measured at the same time and their transverse profiles are determined.
- a measuring head traversing the paper web is preferably used, which has an optical camera in addition to specific sensors. Such a camera is in particular a so-called CCD camera.
- a control loop for fiber orientation is used to control the fiber orientation cross profile at the headbox of the paper machine.
- a formation control loop is preferably formed from a so-called formation controller, a unit for mapping the paper web, a control path and a unit with associated sensors.
- FIG. 1 is a top view of a paper web with an associated measuring head for measurement
- FIG. 2 is a side view of the principle of a light transmission measurement with an additional light source
- Figure 3 shows a diagram for defining the fiber orientation
- Paper webs and the relevant measurand and Figure 4 is a block diagram of a formation control loop.
- 1 denotes a paper web with the width b, which moves from the headbox of a paper machine (not shown in detail in the figures) in the x direction as the paper running direction.
- the width b of the paper web 1 can be between 3 and 10 m and in particular be 5 m.
- the speed of the paper web in the x direction is, for example, 1500 m / min.
- a measuring head 10 is located on the paper web 1 at a distance without contact. All sensors for measuring the paper properties are spatially combined in the measuring head 10.
- the measuring head 10 To detect cross profiles of certain properties of the paper web 1, the measuring head 10 is moved back and forth over the finished paper web 1 immediately before winding it up to form a coil. The measuring head 10 thus executes a movement traversing with time t. Because of the relative movement of the paper web 1 in the x-direction, the measuring head 10 covers a total zigzag path 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.
- a so-called CCD camera (charge coupled device) with electronic memories is advantageously used as the optical camera.
- the camera 11 designed in this way enables simultaneous but independent measurement of the cross profiles of different paper properties, in particular of - fiber orientation
- the properties indicated have the following meaning:
- the fiber orientation is essential for the degree of fiber crosslinking in the paper web. Since the fiber crosslinking determines the strength of the paper web 1, efforts are often made to achieve good fiber crosslinking on the one hand and a uniform one on the other hand. In certain cases, one would also like to give the fiber orientation a preferred direction in order to achieve certain mechanical properties. For this purpose, the fiber orientation must be recorded and influenced locally in detail on the paper web 1.
- a usable measurement of the fiber orientation is achieved on the basis of a camera recording. This results in an image at the respective measuring point.
- the fiber orientation can be measured quantitatively by a suitable evaluation and, for example, an anisotropy factor can be defined.
- FIG. 3 shows a measurement result for a paper web with a medium fiber orientation.
- the angle of the fiber orientation is plotted on the abscissa and the relative frequency is plotted on the ordinate.
- the angle of 90 ° points in the running direction of the machine (MR), the angles 0 and 180 ° point in the relevant transverse direction (QR) so perpendicular to it.
- the anisotropy factor is the ratio of the frequency in the machine direction MR to the frequency in the transverse direction QR. If the fiber orientation is the same for all angles, an anisotropy factor of 1 results.
- the anisotropy factor is> 1, for example 1.5, which means that there is a preferred direction of the fiber orientation in the running direction of the paper web 1.
- the fiber orientation In order to obtain a signal that can be used for control purposes, the fiber orientation must be measured continuously and quasi-continuously.
- the degree of fiber orientation and / or crosslinking is advantageously determined by a pattern recognition performed locally on the camera recording. Neural networks, for example, are suitable for this.
- Formation is the small-area, non-uniform distribution of the fiber mass in the paper web 1 with local accumulation or thinning. In practice, it can be assessed on the basis of a so-called cloudiness when looking through the paper in front of a brightly illuminated surface. The formation can thus also be detected optically, and there may be a connection with the fiber orientation.
- the translucency of paper is referred to as opacity. It is determined by a light transmission measurement in which the intensity of the light that has passed through the paper is measured. For this measurement, a light source is attached to the camera 11 on the other paper side of the paper web 1. The latter can be seen in detail from FIG. 2 that the measuring head 10 traverses back and forth with the camera 11 and a unit 15 with a light source below the paper web 1 carries out corresponding traversing movements.
- the weight per unit area is the mass per unit area of the paper web 1, this size being specified in g / m 2 .
- the basis weight cross profile can also be translucent
- Paper can also be determined by a light transmission measurement with the camera 11.
- the absolute value of the basis weight is not recorded, but only the mean value-free course of the basis weight cross profile is reproduced on the basis of the fluctuations in brightness.
- the shrinkage inevitably results from paper production: in the drying area of the paper machine, water is removed from the paper pulp by passing the paper web 1 over metal rollers heated with steam. Drying can result in uneven shrinkage of the paper web 1 over its width b. If the actuators for basis weight and fiber orientation are in front of the drying section, the shrinkage undesirably changes the places of action of these actuators.
- Controlling 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 assignment is usually called "mapping".
- the traversing camera 11 can achieve an overall image across the entire width of the paper web 1. In the form of stochastic irregularities on the upper side of the paper web 1, the impression of regular screen markings is included.
- a complete control circuit 3 for fiber orientation consists in detail of a fiber orientation controller 31, a mapping unit 32, an actuator 33, a controlled system 34 and a sensor unit 35. These units are each only schematic (“black boxes”) shown, the signal feedback to the comparison point 30.
- the mapping function of the unit 32 also takes into account the change in the assignment of the actuator 33 to the relevant actuator effect caused by shrinkage. Overall, the possibility of influencing the fiber orientation already suggested in the other context can thus be supplemented by the specified quantitative measurement of the fiber orientation to build up a complete control system. In the same way, the other significant properties of paper webs, such as formation, opacity and basis weight, can be incorporated into the control process, taking shrinkage into account.
Landscapes
- Paper (AREA)
Description
Claims
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 true EP0799348A1 (de) | 1997-10-08 |
EP0799348B1 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 |
PL337514A1 (en) * | 1998-04-23 | 2000-08-28 | Saint Gobain Isover | Method of determining fibre structure orientation in mineral fibre substrates |
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 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
- 1995-12-14 DE DE59505937T patent/DE59505937D1/de not_active Expired - Lifetime
-
1997
- 1997-06-17 FI FI972576A patent/FI972576A0/fi not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9619615A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE180026T1 (de) | 1999-05-15 |
DE59505937D1 (de) | 1999-06-17 |
WO1996019615A1 (de) | 1996-06-27 |
FI972576A (fi) | 1997-06-17 |
EP0799348B1 (de) | 1999-05-12 |
FI972576A0 (fi) | 1997-06-17 |
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