EP1176251A1 - Verfahren zum Kalandrieren einer Materialbahn - Google Patents
Verfahren zum Kalandrieren einer Materialbahn Download PDFInfo
- Publication number
- EP1176251A1 EP1176251A1 EP01115546A EP01115546A EP1176251A1 EP 1176251 A1 EP1176251 A1 EP 1176251A1 EP 01115546 A EP01115546 A EP 01115546A EP 01115546 A EP01115546 A EP 01115546A EP 1176251 A1 EP1176251 A1 EP 1176251A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- compensation
- rollers
- changed
- line load
- change
- 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
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/0073—Accessories for calenders
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/0073—Accessories for calenders
- D21G1/008—Vibration-preventing or -eliminating devices
Definitions
- the invention relates to a method for calendering a web of material in which the web of material passes through at least a nip is routed in which a line load is produced.
- the invention is based on a paper web described as an example of a material web. This is also the main application of the present invention. However, the invention is not on paper webs limited, but can also with other material webs are used, for example in cardboard webs or foils made of metal or plastic.
- Paper webs are calendered in the course of their processing, while passing through the nip on the one hand be compressed.
- Calendering can either be in a so-called "soft" nip done by a hard roller and a soft roller, i.e. a roller with an elastic or resilient surface.
- the Calendering can also be done in a smoothing unit, where the nip is formed by two hard rollers is.
- the invention has for its object problems by reducing barring formation.
- This task is carried out in a method of the aforementioned Art solved in that the line load continuously is changed.
- the changes are preferably at most in the range of ⁇ 5%. Such a change in track load does not have a negative impact on the calendering result is harmless in this regard. Nevertheless, one can in such a range ensure that there is sufficient interference in the nip is entered to the barring formation too Reduce.
- the line load is preferably changed by changing Cone forces changed. So you intervene, so to speak the suspension of one of the rollers forming the nip. This is a relatively easy way to control the stretch load to change because this is not complicated Controls are required.
- the line load is preferably varied the compensation of overhanging loads changed.
- components of some rolls of a roll stack such as guide rollers, finger guards or the like, attached, their weight to the overhanging loads counts. This also includes the weight of the bearing housing.
- a roller would not work without compensation only with their own weight on the one below Press the roller and a corresponding line load in the Nip build up, but the line load would go through too these additional weights are affected.
- it is known to compensate for these overhanging loads i.e. for example, hydraulic cylinders are between the roller bearing and a stand, that this the additional weight of the deflection rollers, Pick up the finger protection bracket etc. and the roller bearing can. If you look at the effect of this compensation changed, i.e. strengthened or weakened, one creates a simple change in the line load, without additional components being required.
- the material web is preferably made up of several Headed nips formed by at least three rollers be, with at least two of these rollers overhanging loads and these compensations to be changed. So you don't just attack one Nip one to change the line loads, but with multiple nips. In extreme cases, you can change the line loads of all nips. The more "Defects" are created, the lower the risk that barrings develop.
- the web of material is passed through nips that through Rolls of different types are formed, the Changes in compensation for rollers of one type different than with other types of rollers.
- the rollers of the a type can for example by the so-called soft rollers are formed while the rollers of the the hard rollers are different. If you now the compensation changes in the soft In many cases it does not roll more necessary, a corresponding compensation changes also with the hard rollers. This again simplifies control.
- the overhanging loads are with the help compensated by compensation cylinders in which the Pressures to be changed.
- This is a relatively simple one Measure to take the influence of overhanging loads change.
- the pressures in the compensation cylinders are proportional to the forces acting on the compensation cylinders muster. If you increase these pressures, then the weight forces of the overhanging loads more compensated. If you lower the pressures, then bear the weight of the overhanging loads a larger part of the line load.
- the pressure change is at least one Compensation cylinder made at random. So you use, for example, a random generator, the values for the pressures or pressure differences of the compensation cylinder or specifies. By the Randomly it is practically impossible that a stationary situation that leads to a barring formation leads.
- the pressure change in at least a compensation cylinder depending on a matrix is made up of a multitude of individual values contains that processed in a predetermined manner become.
- the matrix can either contain a number of pressure values, which in the corresponding Compensation cylinder can be set. or it can be absolute or relative pressure value differences by which the pressure in the compensation cylinder is changed. Such an approach is recommended whenever there is already experience when operating a calender.
- the matrix preferably also contains times at which the pressures are changed. Then you are no longer rely on the pressures at equal time intervals or along ramps with constant inclines change but can also change speed influence.
- the invention is based on a preferred Embodiment in connection with the drawing described in more detail. Here shows the only figure: a calender as a roller machine.
- a calender 1 is shown schematically as an example shown for a roller machine with which one Paper web 21 can be calendered.
- the paper web is handled schematically by a processing 10 for this purpose and wound up in a winder 11.
- the calender 1 has eight rolls 2-9, of which four rollers 2, 4, 7, 9 a hard metallic surface and four rollers 3, 5, 6, 8 an elastic plastic covering 13 have.
- the bottom roller 9 is as Deflection adjusting roller and has hydrostatic Support shoes 32 on, as is known per se is.
- rollers are driven and with their roller journals stored in bearing housings 23, 23 '.
- the bearing housing 23 ' the middle rollers 3-8 are attached to levers 24, whose fulcrum 25 is on the calender frame 26.
- a hydraulic cylinder 27 is provided, on the one hand, for the satinizing of the paper web 21, which serves as an example for a material web Forces in the closed nip or nip applies and on the other hand lower the lower roller 9 can.
- By lowering the lower roller 9 lie down the levers 24 on stops 28, in such a way that between the rollers gap of 1 to 10 mm form.
- the two middle hard rolls 4, 7 cannot in heating steam or hot oil Heating can be supplied. Heating steam or oil is passed through peripheral holes 22 so that it can give off its heat to the rollers.
- a sensor 22 is provided to detect the surface of the paper web 21 to investigate.
- the sensor 22 can be long determine in front of the human eye whether on the paper web Horizontal stripes, so-called barrings, appear. As soon as the sensor 22 has such barring formation determines, he gives this knowledge to a control device 14 further, which are discussed below becomes.
- a vibration sensor can be used 30 attached to the frame 26 of the calender 1, which is also connected to the control device 14 is.
- Deflection rollers 33, 37 are arranged on the bearing housings 23 ', which form so-called overhanging loads. To others also belong to these overhanging loads “Attachments", such as finger guards, scrapers or the weight of the bearing housing 23 'itself. To have an influence of these overhanging loads on the middle one Line load, i.e. the pressure distribution in the nips of the Reduce or even eliminate roll stacks 2-9, compensation cylinders 15-20 are provided which arranged between the levers 24 and the stand 26 are. When this compensation cylinder is pressurized then they generate forces equivalent to the weight forces opposite of the overhanging loads are.
- the compensation cylinders 15-20 are with the control device 14 connected.
- the control device 14 provides the pressures in the compensation cylinders 15-20 now not to a constant value that is sufficient the weight of the overhanging loads to compensate, but the control device 14 changed the pressures in the compensation cylinders 15-20 in such a way that the average line loads can change in the nips by ⁇ 5%. This change takes place continuously, i.e. either continuously or with such small intervals that with a constant line load, no barring formation yet has resulted.
- control device 14 has a random generator 29, which outputs random numbers with their Help the compensation cylinder 15-20 are controlled.
- the random numbers with a constant value to be multiplied to a product form the pressure in a compensation cylinder 15-20 is raised or lowered.
- the control device 14 additionally has a memory 31, different in the form of a matrix Pressure values are stored in order at the individual compensation cylinders 15-20 set become. In addition, can also in the memory 31 Stored times that indicate how long a individual pressure value in a compensation cylinder 15-20 is applied. Finally, the control device 14 also have an influence on the control of the support elements 32 take for further changes in line load bring about.
- rollers 3 and 6 offset laterally from the plane through which Rotation axes their two neighboring rollers 2, 4 and 5.7 is defined. This also contains a small one Phase shift between two nips.
- rollers 2-9 have their own drive, can also be provided that the control device 14 controls all drives and here the control device a drive torque distribution varies and thereby interferes with smooth operation.
- the calender roll stack is constructed in such a way that the rollers are not all the same diameter.
- the heated rollers 4.7 are smaller than the top and bottom rollers 2, 9.
- the two rollers 5, 6 also have different diameters.
- the Roller 3 is larger than roller 4. This measure too counteracts barring formation.
Landscapes
- Paper (AREA)
Abstract
Description
Claims (12)
- Verfahren zum Kalandrieren einer Materialbahn, bei dem die Materialbahn durch mindestens einen Nip geleitet wird, in dem eine Streckenlast erzeugt wird, dadurch gekennzeichnet, daß die Streckenlast fortlaufend geändert wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Veränderungen maximal im Bereich von ± 5 % liegen.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Streckenlast durch Änderung von Zapfenkräften verändert wird.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Streckenlast durch eine Variation der Kompensation überhängender Lasten verändert wird.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die Materialbahn durch mehrere Nips geleitet wird, die durch mindestens drei Walzen gebildet werden, wobei bei mindestens zwei dieser Walzen die überhängenden Lasten kompensiert und diese Kompensationen verändert werden.
- Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß die Kompensationsänderungen bei allen betroffenen Walzen gleichartig vorgenommen werden.
- Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß die Materialbahn durch Nips geleitet wird, die durch Walzen unterschiedlicher Art gebildet werden, wobei die Kompensationsänderungen bei Walzen der einen Art anders als bei Walzen der anderen Art erfolgen.
- Verfahren nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, daß die überhängenden Lasten mit Hilfe von Kompensationszylindern kompensiert werden, in denen die Drücke geändert werden.
- Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß die Druckänderung von zumindest einem Kompensationszylinder nach dem Zufallsprinzip vorgenommen wird.
- Verfahren nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß die Druckänderung in mindestens einem Kompensationszylinder in Abhängigkeit von einer Matrix erfolgt, die eine Vielzahl von Einzelwerten enthält, die nach einer vorbestimmten Weise abgearbeitet werden.
- Verfahren nach Anspruch 10, dadurch gekennzeichnet, daß die Matrix auch Zeiten enthält, zu denen die Drücke geändert werden.
- Verfahren nach einem der Ansprüche 3 bis 11, dadurch gekennzeichnet, daß synchron zur Veränderung der Zapfenkräfte zumindest bei einer Durchbiegungseinstellwalze eine Veränderung der Druckbeaufschlagung ihrer Druckelemente erfolgt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10036574A DE10036574C1 (de) | 2000-07-27 | 2000-07-27 | Verfahren zum Kalandrieren einer Materialbahn |
DE10036574 | 2000-07-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1176251A1 true EP1176251A1 (de) | 2002-01-30 |
EP1176251B1 EP1176251B1 (de) | 2004-09-08 |
Family
ID=7650386
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01115546A Expired - Lifetime EP1176251B1 (de) | 2000-07-27 | 2001-06-28 | Verfahren zum Kalandrieren einer Materialbahn |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1176251B1 (de) |
DE (2) | DE10036574C1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101408011B (zh) * | 2004-11-12 | 2012-06-27 | 美卓造纸机械公司 | 对多辊压光机的压光辊的轴承加载的方法及多辊压光机 |
EP2669430A1 (de) * | 2012-05-30 | 2013-12-04 | Metso Paper Inc. | Anordnung zur Steuerung der Vibrationen in einer Faserbahnmaschine |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI115984B (fi) * | 2003-11-27 | 2005-08-31 | Metso Paper Inc | Menetelmä ja järjestely värähtelyn estämiseksi moninippikalanterissa tai -kalanteriryhmässä |
FI117567B (fi) * | 2004-10-14 | 2006-11-30 | Metso Paper Inc | Menetelmä telan vaipan muotovirheistä aiheutuvien nippikuormitusmuutosten kompensoimiseksi |
FI118813B (fi) * | 2007-04-04 | 2008-03-31 | Metso Paper Inc | Kalanterin profiilisäätö |
DE102011007888A1 (de) * | 2011-04-21 | 2012-10-25 | Metso Paper, Inc. | Vorrichtung zur Aufbringung einer Kraft auf eine Walze einer Faserbahnbearbeitungsmaschine |
EP2628851A1 (de) * | 2012-02-14 | 2013-08-21 | Metso Paper Inc. | Verfahren in einem Mehrrollenkalander und Mehrrollenkalander |
EP2806063A1 (de) * | 2013-05-20 | 2014-11-26 | Valmet Technologies, Inc. | Verfahren zum Vermeiden von Schwingungen eines Kalenders und Kalender mit einer Anordnung zum Vermeiden von Schwingungen |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4429455A1 (de) * | 1994-08-19 | 1996-02-22 | Kleinewefers Gmbh | Verfahren zum Verdichten einer Papierbahn und Preßwerk zur Durchführung des Verfahrens |
DE19601293A1 (de) * | 1996-01-16 | 1997-07-17 | Voith Sulzer Finishing Gmbh | Verfahren und Vorrichtung zum Behandeln einer Materialbahn |
EP0928844A2 (de) * | 1998-01-08 | 1999-07-14 | Voith Sulzer Papiertechnik Patent GmbH | Papierkalander und Verfahren zu dessen Betrieb |
EP0949378A1 (de) * | 1998-04-06 | 1999-10-13 | Voith Sulzer Papiertechnik Patent GmbH | Walzenmaschine und Verfahren zu ihrem Betrieb |
-
2000
- 2000-07-27 DE DE10036574A patent/DE10036574C1/de not_active Expired - Lifetime
-
2001
- 2001-06-28 EP EP01115546A patent/EP1176251B1/de not_active Expired - Lifetime
- 2001-06-28 DE DE50103514T patent/DE50103514D1/de not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4429455A1 (de) * | 1994-08-19 | 1996-02-22 | Kleinewefers Gmbh | Verfahren zum Verdichten einer Papierbahn und Preßwerk zur Durchführung des Verfahrens |
DE19601293A1 (de) * | 1996-01-16 | 1997-07-17 | Voith Sulzer Finishing Gmbh | Verfahren und Vorrichtung zum Behandeln einer Materialbahn |
EP0928844A2 (de) * | 1998-01-08 | 1999-07-14 | Voith Sulzer Papiertechnik Patent GmbH | Papierkalander und Verfahren zu dessen Betrieb |
EP0949378A1 (de) * | 1998-04-06 | 1999-10-13 | Voith Sulzer Papiertechnik Patent GmbH | Walzenmaschine und Verfahren zu ihrem Betrieb |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101408011B (zh) * | 2004-11-12 | 2012-06-27 | 美卓造纸机械公司 | 对多辊压光机的压光辊的轴承加载的方法及多辊压光机 |
EP2669430A1 (de) * | 2012-05-30 | 2013-12-04 | Metso Paper Inc. | Anordnung zur Steuerung der Vibrationen in einer Faserbahnmaschine |
Also Published As
Publication number | Publication date |
---|---|
DE10036574C1 (de) | 2001-08-16 |
EP1176251B1 (de) | 2004-09-08 |
DE50103514D1 (de) | 2004-10-14 |
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