EP1484442B1 - Procédé de traitement d'une bande, en particulier d'une bande de papier - Google Patents

Procédé de traitement d'une bande, en particulier d'une bande de papier Download PDF

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Publication number
EP1484442B1
EP1484442B1 EP04102026A EP04102026A EP1484442B1 EP 1484442 B1 EP1484442 B1 EP 1484442B1 EP 04102026 A EP04102026 A EP 04102026A EP 04102026 A EP04102026 A EP 04102026A EP 1484442 B1 EP1484442 B1 EP 1484442B1
Authority
EP
European Patent Office
Prior art keywords
web
roll
damage
nip
extended nip
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
Application number
EP04102026A
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German (de)
English (en)
Other versions
EP1484442A1 (fr
Inventor
Jörg Dr. Rheims
Hans-Rolf Conrad
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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Filing date
Publication date
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Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1484442A1 publication Critical patent/EP1484442A1/fr
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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
    • D21G1/006—Calenders; Smoothing apparatus with extended nips
    • 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
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses

Definitions

  • the invention relates to a method for treating a web, in particular a paper or board web, in which the web is passed through a nip formed between a shoe roll with a circumferential jacket and a heated counter roll, as for example from the document US 2002/0059872 A1 is known.
  • the treatment of a web in a nip serves to smooth the web volume-saving.
  • the shell of the shoe roll is pressed by means of a pressure shoe in a peripheral region of the counter roll, which is longer in the web running direction than the width of a nip formed between two cylindrical rollers, even if one of these two rollers can have an elastic surface coating.
  • the coat of the shoe roll must be performed on its circulation over the pressure shoe.
  • oil is introduced by a hydrostatic lubrication in the pressure surface between the pressure shoe and the jacket.
  • the cavity is sealed by seals, e.g. Slices, limited.
  • seals e.g. Slices
  • the coat of the shoe roll is relatively heavily stressed. He becomes out of its cylindrical shape at each revolution deformed out. During operation, it can not be ruled out that the jacket will be damaged. In this case, the circumferential speed with web speed coat and also with the web speed circulating counter roll must be slowed down, but this course requires a certain amount of time. Usually one can achieve a speed reduction of 10 m / min per second. This means that the braking process can reach an order of minutes in time. During this time, oil is very likely to escape from the damaged shell. This leakage can be exacerbated by centrifugal forces of the still circulating shell. This creates a dangerous situation. On the one hand, the oil spraying out of the damaged jacket can cause mechanical damage in the environment. On the other hand, this oil can also reach the heated counter-roller. Here temperatures of well over 100 ° C are common. If this temperature is above the flash point of the oil used in the shoe roll, the oil can ignite, which severely limits the reliability.
  • the invention has for its object to reduce the risk of fire.
  • This object is achieved in the method of the type mentioned above in that the coat is monitored for damage, opens the wide nip on the occurrence of damage and the web continues to feed and used as a protective device.
  • pressure is monitored in a cavity surrounding the shell.
  • the jacket there is usually a pressure of at least 25 mbar to stabilize the shape of the shell.
  • this pressure is even higher, for example in the range of 35-90 mbar.
  • the seals must still seal the jacket effectively against a higher pressure difference to the outside.
  • a shell damage can now be detected by making one or more pressure measurements during operation. If, for example, the overpressure in the cavity surrounding the jacket drops to a value below 20 mbar, this is interpreted as a crack or damage to the jacket.
  • the exact values that indicate a crack in the coat of course, depending on the shoe shoe.
  • the shoe roll can also be optically monitored, for example with the aid of a camera.
  • the camera takes a picture of the surface of the shoe roll. If this image changes, this is also an indication of damage to the roller. Optionally, an oil spill itself can be seen.
  • the web is wrapped behind the nip and wrapped around one of the two rolls. So you let the web still run, but uses the web to "pack" one of the two rolls.
  • additional conducting agents are required, which give the web the desired direction.
  • the web is wrapped around the backing roll, the oil is prevented from coming into contact with the hot roll surface.
  • the shoe roll is wrapped, the shoe roll is trapped so that the web is used to prevent the escape of oil from the jacket.
  • the coat is stabilized.
  • the winding forming on the jacket in both cases represents a thermal insulation to the respective other roller.
  • the web is deflected in front of the nip when wrapped around the roll at a predetermined thickness.
  • the protective layer has reached a predetermined thickness on the roller. Additional layers of the web then provide no additional protection. In this case, the track becomes separated from the broad nip, so that the "wrapped" roller can then leak.
  • the web is wound around the roll with a thickness which corresponds to a maximum of 90% of the distance of the rolls in the open state of the wide nip. This prevents the reel from becoming too thick and damaging the rolls forming the widening nip.
  • the web is wrapped around the roll with a thickness of at least 1 mm.
  • the diameter of the roller then increases by 2 mm. If you pack the shoe roll, then the winding can also have a thickness of at least 1.5 mm in order to stabilize the coat can additionally.
  • a sensor is used which determines the thickness of the web wound around the roll. This sensor can then generate a signal on which the web is knocked off before the nip.
  • the calculation is carried out after the occurrence of the damage.
  • the current data are available, especially the web speed and the braking speed when braking the rollers.
  • the web leads the web through the opened wide nip to a position behind the broad nip. There, the web can be returned, for example, in the pulper or wound up. If the web is continued, it merely prevents oil from being sprayed from the damaged shell of the shoe roll to the heated counter roll. In many cases, this approach is also sufficient to prevent a fire hazard.
  • one marks the web For example, one can spray paint onto the edge of the web so that one can readily recognize later on the finished roll which part of the web is to be considered scrap.
  • the web is offset transversely to its direction of travel when the damage of the jacket occurs outside the web width.
  • the damage occurs in an axial end or edge region of the shell, then the oil could splash out laterally adjacent to the web. This failure is easily defused by moving the web so far that it can cover the damage again.
  • Such a shift can be effected, for example, by tilting a guide roller arranged in front of the broad nip somewhat.
  • Fig. 1 shows a wide-nip calender 1 with a shoe roll 2 and a counter-roller 3, which form a nip 4 between them.
  • the wide nip 4 is opened, ie the shoe roll 2 and the counter roll 3 have been removed from each other.
  • the shoe roll 2 has a circumferential jacket 5, which is loaded by means of a pressure shoe 6 in the direction of the counter roll 3.
  • the pressure shoe 6 has a pressure surface 7 which is concavely curved so that the jacket 5 can be pressed against the circumference of the counter roller 3 in the region of the pressure shoe 6. This is shown schematically by the corresponding curvature of the jacket 5.
  • hydrostatic lubrication is provided in the pressure surface, ie it is continuously pressed an oil between the jacket 5 and the pressure shoe 6.
  • This oil accumulates in a cavity 8, which is surrounded by the jacket 5. From the cavity 8, the oil is carried away with discharge means, not shown.
  • the cavity 8 is closed at its end faces, for example by end plates.
  • the counter roll 3 is heated.
  • it has, for example, peripheral bores 9, through which a heating medium, for example steam or heated oil, can be passed in order to heat the surface of the counter-roller 3.
  • a heating medium for example steam or heated oil
  • the temperature of the surface of the counter-roller 3 can certainly assume values of the order of 180 ° C. or more.
  • a knock-off device 10 is activated, which cuts through a web 11 which passes through the wide nip.
  • the chopping device 10 is arranged in the web running direction, which is represented by an arrow 12, in front of the nip 4, i. Attempts to remove the web 11 from the nip 4. This procedure is not used in this case. Rather, the following happens:
  • a pressure sensor 13 which is arranged in the cavity 8.
  • the pressure sensor 13 can either detect an absolute pressure in the cavity.
  • the pressure in the cavity 8 is normally on the order of 25 to 95 mbar higher than the ambient pressure. If this pressure on one Value falls below 20 mbar, this is interpreted as a crack of the mantle 5.
  • optical monitoring for example in the form of a camera 14, which is directed onto the surface of the jacket 5. If there is a change, then it is also decided on a damage of the shell 5.
  • the shoe roll 2 and the counter roll 3 are driven apart as soon as possible to open the nip 4.
  • the oil supply to the shoe roll 2 is interrupted.
  • the oil containing and circulating at web speed shoe roll 2 must then be slowed down, but this requires a certain amount of time due to the inertia.
  • the speed can be reduced by 100 m / min in 10 s. At production speeds of over 600 m / min, it would therefore take over one minute until the shoe roll 2 has come to a standstill. At higher web speeds, this time takes even longer.
  • the web 11 is severed by the chopping device 10 in front of the broad nip.
  • the time is determined by the thickness of the web 11 and thus the thickness of the "packaging" of the shell 5, so the coil 18, the strength of the web 11 and the distance between the two rollers 2, 3 in the open state of the broad nip 4.
  • Der Winding 18 may be at most as thick as the distance between the rollers 2, 3. Preferably, the thickness should be less than 90% of the distance.
  • the strength of the "package” depends on the strength of the web used.
  • the winding should consist of at least 6 layers of the web or at least 1.5 mm thick. This results in a diameter increase of at least 3 mm.
  • the time at which the web 11 is knocked off for the second time can be calculated , namely in front of the nip 4. The calculation of this time can take place while the process described is running.
  • a sensor 19 may be used which measures the thickness of the coil 18 and determines therefrom and from the distance of the knock-off device 10 the time for knocking off the wide nip 4.
  • a device for trimming the edges of the web is still provided in front of the nip 4.
  • These aggregates for web trimming can be deactivated for the duration of the disturbance, that is to say when the reel 18 is produced around the shoe roll 2. This increases the width of the web 11 on the shoe roll 2, which offers even better protection.
  • Fig. 2 shows a modified embodiment. The same elements are provided with the same reference numerals.
  • the web 11 is guided after knocking off with the aid of the knock-off device 15 around the counter-roller 3.
  • Schematically represented by arrows 20 are guiding means which, after being knocked off, behind the broad nip 4 guide the web 11 around the counter-roller 3 in order to form the winding 18 there.
  • the hot surface of the backing roll 3 is covered and thus prevents oil from getting onto the hot surface of the backing roll 3.
  • the roll 18 should also consist in this case of at least six layers or be at least 1 mm thick, so that the diameter of the backing roll 3 grows by at least 2 mm.
  • FIG. 3 shows a further modified embodiment. Same elements are denoted by the same reference numerals as in FIG Fig. 1 and 2 described.
  • the web 11 is not severed when an error occurs. Rather, it continues to run and is wound into a winding roll 21 or passed into a pulper, not shown. However, the web 11 still acts as a barrier between the shoe roll 2 and the counter roll 3, so that oil can not reach the hot surface of the counter roll 3.
  • the web 11 is then knocked off by means of the chopper 10 in front of the nip 4 when the mantle 5 only has a low speed.
  • the speed should preferably be less than 100 m / min, better less than 50 m / min and more preferably less than 5 m / min.
  • the web can be used as a protective device.

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  • Paper (AREA)

Claims (17)

  1. Procédé pour traiter une bande (11), en particulier une bande de papier ou de carton, dans lequel la bande (11) est guidée à travers un pinçage prolongé (4), qui est formé entre un cylindre à sabot (2) avec une enveloppe périphérique (5) et un contre-cylindre chauffé (3), caractérisé en ce que l'on surveille l'enveloppe (5) pour déceler des endommagements, et à l'apparition d'un endommagement, le pinçage prolongé (4) est ouvert et la bande (11) est avancée et utilisée comme dispositif de protection.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on surveille une pression dans la cavité (8) entourant l'enveloppe (5) pour détecter un endommagement de l'enveloppe (5).
  3. Procédé selon la revendication 2, caractérisé en ce que l'on surveille une variation de pression dans la cavité (8).
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'on surveille optiquement le cylindre à sabot (2).
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'on abat la bande (11) derrière le pinçage prolongé (4) à l'apparition d'un endommagement et on l'enroule autour de l'un des deux cylindres (2, 3).
  6. Procédé selon la revendication 5, caractérisé en ce que l'on abat la bande (11) avant le pinçage prolongé (4) lorsqu'elle a été enroulée sur une épaisseur prédéterminée autour du cylindre (2, 3).
  7. Procédé selon la revendication 6, caractérisé en ce que l'on enroule la bande (11) autour du cylindre (2, 3) avec une épaisseur qui correspond au maximum à 90 % de la distance entre les cylindres (2, 3) dans l'état ouvert du pinçage prolongé (4).
  8. Procédé selon la revendication 6 ou 7, caractérisé en ce que l'on enroule la bande (11) avec une épaisseur d'au moins 1 mm autour du cylindre (2, 3).
  9. Procédé selon l'une quelconque des revendications 6 à 8, caractérisé en ce que l'on utilise un capteur (19) qui détecte l'épaisseur de la bande (11) enroulée autour du cylindre (2, 3).
  10. Procédé selon l'une quelconque des revendications 6 à 9, caractérisé en ce que l'on calcule un instant pour abattre la bande (11) avant le pinçage prolongé (4) en tenant compte de la circonférence du cylindre (2, 3), de l'allure de la vitesse du cylindre et de la distance du dispositif d'abattage (10) au pinçage prolongé (4).
  11. Procédé selon la revendication 10, caractérisé en ce que l'on effectue le calcul après l'apparition d'un endommagement.
  12. Procédé selon l'une quelconque des revendications 5 à 11, caractérisé en ce que l'on soulève du cylindre les unités qui s'appliquent contre le cylindre à enrouler (2, 3) ou qui lui sont directement adjacentes, à l'apparition d'un endommagement.
  13. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'on guide la bande à travers le pinçage prolongé ouvert (4) jusqu'à une position (21) derrière le pinçage prolongé (4).
  14. Procédé selon la revendication 13, caractérisé en ce que l'on marque la bande (11).
  15. Procédé selon l'une quelconque des revendications 1 à 14, caractérisé en ce que l'on désactive une découpure de la bande avant le pinçage prolongé (4) à l'apparition d'un endommagement.
  16. Procédé selon l'une quelconque des revendications 1 à 15, caractérisé en ce que l'on décale la bande (11) transversalement à sa direction d'avance, lorsque l'endommagement de l'enveloppe (5) se produit en dehors de la largeur de la bande.
  17. Procédé selon la revendication 16, caractérisé en ce que l'on détermine la position axiale de l'endommagement.
EP04102026A 2003-06-07 2004-05-11 Procédé de traitement d'une bande, en particulier d'une bande de papier Expired - Lifetime EP1484442B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10325947A DE10325947C5 (de) 2003-06-07 2003-06-07 Verfahren zum Behandeln einer Bahn, insbesondere einer Papierbahn
DE10325947 2003-06-07

Publications (2)

Publication Number Publication Date
EP1484442A1 EP1484442A1 (fr) 2004-12-08
EP1484442B1 true EP1484442B1 (fr) 2008-07-16

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ID=33154593

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EP04102026A Expired - Lifetime EP1484442B1 (fr) 2003-06-07 2004-05-11 Procédé de traitement d'une bande, en particulier d'une bande de papier

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EP (1) EP1484442B1 (fr)
AT (1) ATE401451T1 (fr)
DE (2) DE10325947C5 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005007835A1 (de) * 2005-02-21 2006-08-31 Voith Paper Patent Gmbh Presswalzenüberwachung
DE102007045895A1 (de) 2007-09-26 2009-04-09 Voith Patent Gmbh Bandkalandervorrichtung und Verfahren zum Betrieb einer Bandkalandervorrichtung
DE102009055248A1 (de) * 2009-12-23 2011-06-30 Voith Patent GmbH, 89522 Vorrichtung und Verfahren zum Überwachen einer Pressvorrichtung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI4742U1 (fi) * 2000-10-11 2000-12-13 Valmet Corp Kalanteri
US6505549B2 (en) * 2000-11-20 2003-01-14 Metso Paper Karlstad Ab Method of and an apparatus for protecting the jacket upon a web break in a hot shoe press roll nip
DE10157914A1 (de) * 2001-11-26 2002-08-29 Voith Paper Patent Gmbh Verfahren zur Bahnabrissüberwachung und Maschine zur Durchführung des Verfahrens
DE10158909C1 (de) * 2001-11-30 2003-04-17 Voith Paper Patent Gmbh Kalander

Also Published As

Publication number Publication date
DE10325947C5 (de) 2009-11-26
DE502004007588D1 (de) 2008-08-28
EP1484442A1 (fr) 2004-12-08
ATE401451T1 (de) 2008-08-15
DE10325947B3 (de) 2005-01-20

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