EP2317008B1 - Procédé et dispositif d'ouverture d'un interstice de pressage - Google Patents

Procédé et dispositif d'ouverture d'un interstice de pressage Download PDF

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Publication number
EP2317008B1
EP2317008B1 EP20100176729 EP10176729A EP2317008B1 EP 2317008 B1 EP2317008 B1 EP 2317008B1 EP 20100176729 EP20100176729 EP 20100176729 EP 10176729 A EP10176729 A EP 10176729A EP 2317008 B1 EP2317008 B1 EP 2317008B1
Authority
EP
European Patent Office
Prior art keywords
roll
belt
severing
guide
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.)
Not-in-force
Application number
EP20100176729
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German (de)
English (en)
Other versions
EP2317008A1 (fr
Inventor
Jochen Niemann
Lars KRÜGER
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
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Voith Patent GmbH
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Filing date
Publication date
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Publication of EP2317008A1 publication Critical patent/EP2317008A1/fr
Application granted granted Critical
Publication of EP2317008B1 publication Critical patent/EP2317008B1/fr
Not-in-force legal-status Critical Current
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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
    • D21G1/002—Opening or closing mechanisms; Regulating the pressure
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/04—Paper-break control devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G5/00—Safety devices
    • D21G5/005—Safety devices for calenders

Definitions

  • the invention relates to a method for opening a nip treated a fibrous web, which is formed by a circulating over at least two guide rollers belt with a counter roll by the belt over a wrap angle greater than 5 ° conforms to the peripheral surface of the backing roll, wherein the fibrous web by means is monitored by a sensor in front of the nip for tearing or folding and in the event of cracks or creases, the sensor via a control device, a signal to a separation device passes, which moves at least one guide roller during the separation process motor within 0.9 seconds.
  • the invention further relates to a device for opening a nip serving for the treatment of a fibrous web, which is formed by a band circulating over at least two guide rollers with a counter-roller by the band conforming to the peripheral surface of the counter-roller over a wrap angle greater than 5 ° the at least one guide roller is displaceably mounted via a separating device, wherein a control is provided which activates the separating device on the basis of a detected via a sensor error of the current fibrous web.
  • Nips are the contact surfaces between two circumferential treatment surfaces, between which a fibrous web can be treated.
  • calender nipples are used to explain the invention, between which a paper or board web is calendered.
  • one of the contact surfaces is provided with a relatively soft surface, and the other treatment surface is formed by a hard, very smooth and often also heatable treatment surface.
  • Nips can have very different lengths in the web running direction. This depends, for example, on the type of calender and the pressure under which the treatment surfaces are pressed on one another.
  • one of the treatment surfaces is provided with a softer plastic layer, care must be taken that there is never a second heated treatment surface with it direct contact comes, but always a paper web is present in between, which transported away the heat dissipated. In the case of a web break, for example, care must be taken to ensure that the treatment areas separate quickly from each other.
  • the first known publication, the EP 1176252 81 refers to a roll calender, which generally has relatively short nip lengths.
  • a lower roller which forms a nip with at least one further roller, can be lowered rapidly via a hydraulic cylinder in the event of a fault.
  • the lowering operation is skilfully decelerated in order to avoid an abrupt placement of the roller and an associated vibration.
  • Such a hydraulic cylinder is activated when, for example, a photocell detects a crack in a fibrous web.
  • Modern calenders with very long nips are the band calenders. These are the paper or board web by means of a circulating belt over a larger angle of wrap to a heated Counter roll pressed. In this case, the band is held under belt tension, so that results from the resultant of the curvature and a system pressure to the web. If the band is made of plastic, there is also the danger of overheating of the band in case of web break. On the other hand, if the band is made of metal, that is usually made of a thin sheet steel, its danger of being damaged in the event of folds in the web is very great. The web is retracted in such a calender with rotating counter roll and with applied and circulating belt, which further increases the risk of belt damage.
  • the object is achieved in the method by the separation device, the at least one guide roll while maintaining a Bandzugschreib offset such that the tape is spaced after the separation process of the backing roll, wherein the tape is tensioned during or immediately after the separation process via a clamping element.
  • the term "motor” is to be understood here as the involvement of all possible drives which can move a roller by electrical, hydraulic or pneumatic means, with rotary motion or stroke. Possibly. are also several such drives necessary.
  • the period of 0.9 seconds is an acceptable size at today's web speeds of about 1000 to 2000 m / min, where on the one hand the known in the art sensor for detecting cracks or wrinkles in the web still arranged in a suitable area in front of the calender on the other hand, enough time remains for the control and the motorized separator to separate the calender nip before the Defile in the web reaches him.
  • the band wraps around the counter roll at least 5 ° on the outer circumference, so that a resultant force from the belt tension can produce a sufficiently large contact pressure.
  • the clamping element holds the strip tension at least almost constant during the separation process.
  • the band tension loss caused by the separation from the counter roll and the reduction of the loop around the counter roll is compensated in this case by the clamping element.
  • the counter roll By the opening process of the nip according to the invention, it is possible and cheap, the counter roll to a surface temperature of more than 130 ° C, especially when using tapes with a Plastic part, to heat. This produces a higher web quality after calendering.
  • the separation device moves a guide roller on a circular path away from the counter roll.
  • the guide roller may be mounted in a pivotable lever, so that significantly less friction losses occur during the separation process as in a linear guide Leitvvalzenlagers.
  • the object underlying the invention is achieved in that a clamping element is provided which can be acted on during a separating operation with a force for tensioning the strip.
  • the clamping element comprises a roller.
  • the roller which acts against the belt to build up the tension, rotates at the same peripheral speed as the belt speed. As a result, a contact friction and thus wear is avoided.
  • the counter-roller is fixedly mounted.
  • the counter roll which is often heatable, is the largest and heaviest roll in a belt calender. Moving them to separate the nip is obvious but energetically obsolete. If the Roll axis of the mating roll remains fixed, their supply can be hard-piped with a Helz medium, so that hardly any sealing problems occur as in hose connections.
  • the separation device comprises a servomotor.
  • a motor With such a motor, the movement of the guide roller can be controlled specifically.
  • Under a motor are electrical, hydraulic and pneumatic actuators to understand. If, for example, a simple hydraulic cylinder is selected as the engine, braked motion controls of the piston can be realized, as described in US Pat EP 1176252 B1 are disclosed.
  • the at least one guide roller mounted in a lever is pivotable about an axis of rotation.
  • the axis of rotation is the axis of a second guide roller. It saves the storage of a separate axis of rotation and uses an existing axis, namely a belt guide, as a rotation axis. This saves space and material.
  • a controller which controls the disconnecting device on the basis of an error detected by a sensor active fibrous web activated. It is therefore ensured that the separation of the nip takes place automatically.
  • the belt calender 1 in FIG. 1 consists essentially of a three circulating rollers 11, 12, 13 circumferential band 4, which has a Umschtingungswinkel> 5 ° contact with a counter-roller 5.
  • the belt is driven, for example, in unillustrated form over one of the three guide rollers 11 12, 13 until it has reached the Umangsgeschwingkeit counter roller 5 and the fibrous web 2. In practice, such a band can be up to 10 m wide.
  • the fibrous web 2 passes through the nip 3 between the belt 4 and counter-roller 5.
  • the nip 3 is thus a contact zone between the belt 4 and counter-roller 5, which may be between 100 and 1000 mm in the web running direction, depending on the type of fiber web.
  • the counter-roller 5 is heated in an unillustrated form to above 130 ° C surface temperature and stored permanently.
  • suitable heat transfer fluids that are passed through the interior of the roll, or external heaters that operate inductively, capacitively or by Helßluftanblasung.
  • a created by an additional roller 18 Saknip 19 has been created on the counter-roller 5, which is not directly related to the invention, but the calender gives a greater calendering potential.
  • All band guide rollers 11, 12, 13 are mounted on a common frame 20, which in turn is housed in a housing 17.
  • the diameter of these guide rolls is in the range of 400 to 1000 mm.
  • the band 4 undergoes a Bandzugspsnnung.
  • Both guide roller 11 and guide roller 12 have a distance to the counter roll 5, which is greater than the sum of strip and web thickness.
  • To the frame 20 engages a servomotor 9, which can rotate the guide rollers 11 and 13 about an axis of rotation 16 which corresponds to the axis of the guide roller 12 at the same time.
  • the lever 15 so is responsible for the fact that the guide roller 11 can move away on a circular arc of the counter-roller 5. As a result, the belt 4 also lifts off the counter-roller 5.
  • This movement is initiated by a sensor 6 when it detects a fault in the web 2. Such errors are, for example, cracks or wrinkles.
  • the signal (dashed line) is forwarded to a controller 7, which in turn causes the servomotor 9 to move.
  • the guide roller 11 is pivoted away from the counter-roller 5, that the tape 4 no later than 0.9 seconds after detection of the defect in the web 2 has no contact with the counter-roller 5.
  • a special advantage is provided by a tensioning element 10. This serves to adjust the lost arc of the band 4 about the counter-roller 5 so that the band retains a band tensile stress.
  • the tensioning element consists essentially of a pressure transducer 21 and a roller 14 which presses against the inner surface of the belt.
  • the roller 14 is identical to the guide roller 11.
  • FIG. 2 alternatively shows a separate roller 14, over a Pressure transducer 21 and a lever system 22 can be pressed against the belt to build a tensile band tension during or shortly after the separation process.
  • the pressure transducer 21 is a hydraulic cylinder in both examples.
  • the hydraulic cylinder is controlled position-controlled and / or druckgeregeit.
  • a cushioning not shown, is provided.
  • spindles are suitable for the tension. Linear drives, pneumatic cylinders, tension over weight load or the like.
  • FIG. 3 To further illustrate the invention is in FIG. 3 the calender 1 is shown once with the nip 3 open. Clearly it can be seen that the band 4 no longer touches the counter-roller, but is still stretched by means of the clamping element 10.
  • the band 4 is preferably made of plastic, for example PU, PEEK, PFD, Teflon, rubber and mixtures with fibers of glass, aramid or metal fabric.
  • the band can also be made of plastic with a thin metal underlayer. Other materials for the band are metal or metal with a plastic underlayer.
  • the band is additionally heated.
  • the guide rollers can be heated or the belt are heated inductively.
  • the tape has a surface roughness of ⁇ 1.0 microns, better less than 0.5 microns.
  • the tape has a thickness of 0.5 to 10 mm, preferably 0.8 to 5 mm,
  • the band 4 does not have to provide a calendering effect, but can also be used only for effective heating of the web 2 on the heated counter-roller 5 before the web passes the additional nip 19 for elgentliche Glanz- and Glättssteig für für a calender 1
  • a calender 1 which has a preheating section for the web 2 under the band 4 or possibly also a Nachfiltier behind the nip with a similar band structure, the band 4 is pressed at a pressure of 0.1 to 1 MPa against the backing roll 5 to the temperature the counter roller 5 to penetrate deep into the paper or the cardboard and so to improve the smoothing result.
  • a strip treatment zone is created immediately before or after a supplementary nip 19.
  • the advantage of this method of smoothing or of this arrangement lies in the fact that a water- and intestinal-opaque band is used, so that the moisture can not escape from the web 2 in the band treatment zone. The moisture is indeed driven to the cold side of the tape, but remains there stored. Only after the strip treatment zone moisture can escape from the paper web into the environment.
  • the illustrated calender 1 can also be combined in a variety of ways with a Mehrwalzenkander or another calender.

Landscapes

  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Claims (12)

  1. Procédé d'ouverture d'un interstice de pressage (3) pour le traitement d'une nappe fibreuse (2), lequel est formé par une bande (4) tournant autour d'au moins deux rouleaux directeurs (11, 12, 13) avec un rouleau conjugué (5), la bande (4) épousant la surface périphérique du rouleau conjugué (5) suivant un angle d'enveloppement supérieur à 5°, la nappe fibreuse (2) étant contrôlée au moyen d'un capteur (6) en vue de déceler des déchirures ou des plis avant l'interstice de pressage et, dans le cas de l'apparition de fissures ou de plis, le capteur (6) envoyant un signal par le biais d'un dispositif de commande (7) à un dispositif de coupe (8), qui en l'espace de 0,9 seconde déplace par moteur au moins un rouleau directeur (11) pendant l'opération de coupe, caractérisé en ce que le dispositif de coupe (8) déplace l'au moins un rouleau directeur (11) en conservant une tension de traction de la bande de telle sorte que la bande (4), après l'opération de coupe, soit espacée du rouleau conjugué (5), la bande (4) étant tendue pendant l'opération de coupe ou immédiatement après celle-ci par le biais d'un élément de tensionnement (10).
  2. Procédé selon la revendication 1, caractérisé en ce que l'élément de tensionnement (10) maintient au moins approximativement constante la tension de traction de la bande pendant l'opération de coupe.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le rouleau conjugué (5) est chauffé à une température superficielle supérieure à 130°C.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le dispositif de coupe (8) déplace un rouleau directeur (11) sur une trajectoire en arc de cercle à l'écart du rouleau conjugué (5).
  5. Dispositif d'ouverture d'un interstice de pressage (3) servant au traitement d'une nappe fibreuse (2), lequel est formé par une bande (4) tournant autour d'au moins deux rouleaux directeurs (11, 12, 13) avec un rouleau conjugué (5), la bande (4) épousant la surface périphérique du rouleau conjugué (5) suivant un angle d'enveloppement supérieur à 5°, au moins un rouleau directeur (11, 13) étant monté de manière à pouvoir être déplacé au-dessus d'un dispositif de coupe (8), une commande (7) étant prévue, laquelle active le dispositif de coupe (8) sur la base d'une erreur de la nappe fibreuse en mouvement (2) détectée par le biais d'un capteur (6), caractérisé en ce qu'un élément de tensionnement (10) est prévu, lequel peut être sollicité avec une force pour le tensionnement de la bande (4) pendant une opération de coupe.
  6. Dispositif selon la revendication 5, caractérisé en ce que l'élément de tensionnement (10) comprend un rouleau (14).
  7. Dispositif selon la revendication 6, caractérisé en ce que le rouleau (14) est l'un des rouleaux directeurs (11).
  8. Dispositif selon l'une quelconque des revendications 5 à 7, caractérisé en ce que le rouleau conjugué (5) est monté de manière fixe.
  9. Dispositif selon l'une quelconque des revendications 5 à 8, caractérisé en ce que tous les rouleaux directeurs (11, 12, 13) présentent une distance au rouleau conjugué (5), même dans des conditions de fonctionnement, qui est supérieure à la somme de l'épaisseur de la bande et de la nappe.
  10. Dispositif selon l'une quelconque des revendications 5 à 9, caractérisé en ce que le dispositif de coupe (8) comprend un moteur de commande (9).
  11. Dispositif selon l'une quelconque des revendications 5 à 10, caractérisé en ce que l'au moins un rouleau directeur (11), monté dans un levier (15), peut pivoter autour d'un axe de rotation (16).
  12. Dispositif selon la revendication 11, caractérisé en ce que l'axe de rotation (16) est l'axe d'un deuxième rouleau directeur (12).
EP20100176729 2009-10-27 2010-09-15 Procédé et dispositif d'ouverture d'un interstice de pressage Not-in-force EP2317008B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910046053 DE102009046053A1 (de) 2009-10-27 2009-10-27 Verfahren und Vorrichtung zum Öffnen eines Nips

Publications (2)

Publication Number Publication Date
EP2317008A1 EP2317008A1 (fr) 2011-05-04
EP2317008B1 true EP2317008B1 (fr) 2013-09-11

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EP20100176729 Not-in-force EP2317008B1 (fr) 2009-10-27 2010-09-15 Procédé et dispositif d'ouverture d'un interstice de pressage

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EP (1) EP2317008B1 (fr)
JP (1) JP2011094286A (fr)
CN (1) CN102051838A (fr)
DE (1) DE102009046053A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010028738A1 (de) 2010-05-07 2011-11-10 Voith Patent Gmbh Bahnbehandlungsvorrichtung mit Anlageband
DE102011052229A1 (de) * 2011-07-28 2013-01-31 Andritz Küsters Gmbh Kalander
EP2584093A1 (fr) 2011-10-20 2013-04-24 Metso Paper Inc. Système relatif à une chaîne de production d'une bande de fibres
DE102011085093A1 (de) 2011-10-24 2013-04-25 Voith Patent Gmbh Bahnbehandlungsvorrichtung
DE102011085101A1 (de) 2011-10-24 2013-04-25 Voith Patent Gmbh Bahnbehandlungsvorrichtung
DE202012008035U1 (de) 2012-08-20 2012-09-12 Voith Patent Gmbh Vorrichtung zur Behandlung einer Faserstoffbahn
DE102015217367B4 (de) 2015-09-11 2017-05-18 Voith Patent Gmbh Verfahren zur Behandlung einer Bahn
DE102019100884A1 (de) 2019-01-15 2020-07-16 Voith Patent Gmbh Vorrichtung und Verfahren zur Behandlung einer Faserstoffbahn

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20012878U1 (de) 2000-07-26 2000-10-05 Voith Sulzer Papiertechnik Patent GmbH, 89522 Heidenheim Kalander
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
DE102007045902A1 (de) 2007-09-26 2009-04-09 Voith Patent Gmbh Bandkalandervorrichtung und Verfahren zum Betrieb einer Bandkalandervorrichtung

Also Published As

Publication number Publication date
DE102009046053A1 (de) 2011-05-05
EP2317008A1 (fr) 2011-05-04
JP2011094286A (ja) 2011-05-12
CN102051838A (zh) 2011-05-11

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