EP1582625B1 - Calandre à pince allongée et procédé pour lisser une bande dans un calandre à pince allongée - Google Patents

Calandre à pince allongée et procédé pour lisser une bande dans un calandre à pince allongée Download PDF

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Publication number
EP1582625B1
EP1582625B1 EP20050100479 EP05100479A EP1582625B1 EP 1582625 B1 EP1582625 B1 EP 1582625B1 EP 20050100479 EP20050100479 EP 20050100479 EP 05100479 A EP05100479 A EP 05100479A EP 1582625 B1 EP1582625 B1 EP 1582625B1
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EP
European Patent Office
Prior art keywords
pressure
roll
shoe
membrane
pressure chamber
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
EP20050100479
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German (de)
English (en)
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EP1582625A1 (fr
Inventor
Thomas Wöhner
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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Publication date
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Publication of EP1582625A1 publication Critical patent/EP1582625A1/fr
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Publication of EP1582625B1 publication Critical patent/EP1582625B1/fr
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0206—Controlled deflection rolls
    • 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
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0206—Controlled deflection rolls
    • D21G1/0213—Controlled deflection rolls with deflection compensation means acting between the roller shell and its supporting member
    • D21G1/022—Controlled deflection rolls with deflection compensation means acting between the roller shell and its supporting member the means using fluid pressure

Definitions

  • the invention relates to a wide-nip calender with a shoe roll, a heated backing roll and a formed between the shoe roll and the backing roll nip with a working length, wherein the shoe roll has a circumferential jacket, which is loadable by a Anpreßschuhan ever towards the backing roll. Furthermore, the invention relates to a method for calendering a web in a nip formed between a shell of a shoe roll and a heated backing roll, wherein the shell is loaded by means of a Anpreßschuhan ever towards the backing roll.
  • a wide nip also referred to as an "extended" nip, has a longer working length than a "normal” nip formed between two rolls.
  • a material web which is calendered in the extended nip is treated for a longer time.
  • the compressive stresses in a nip are usually lower than in a normal nip. This leads to a lower compression, so to a volume-saving satin finish.
  • the sheath of the shoe roll is usually pressed by a pressure shoe against the counter roll, which is formed of a rigid metal block.
  • This pressure shoe has a pressure surface, which is against the counter roll is adapted. If one knows the radius of the counter roll, the thickness of the web to be satinized and the thickness of the shell, then one can calculate the contour of the pressure surface and then grind it. It is more or less well adapted to the counter roll within the tolerances.
  • the US 5,753,084 also describes a press with an extended press nip in which the press length is adjustable. Both rolls have a circumferential elastic sheath.
  • the invention has for its object to be able to adjust different treatments of webs in a simple way.
  • the pressure shoe assembly may be left in the shoe roll. Only the length adjusting device is actuated in order to change the pressure shoe arrangement such that the working length of the wide nip adjusts to a desired value.
  • the working stayer Material web travels in the direction of travel. This direction is also referred to as "machine direction". If a longer treatment time is desired, then the Anpreßschuhan onion is changed so that increases the working length of the wide nip. If a shorter treatment time is desired, then the working length of the wide nip is reduced by a corresponding operation of the length adjustment. Of course, this shortened illustration applies at constant speeds of the material web.
  • the Anprssschuhan onion has at least one pressure chamber which is bounded at least on its co-operating with the side by a flexible membrane.
  • the membrane is preferably not only flexible, but also elastic within certain limits. If you put the pressure chamber under pressure, then the membrane initially bulges in the direction of the counter roll. If then the mating roll and the shoe roll are moved together, then the mating roll immersed more or less far into the membrane with the liner. The membrane then adapts automatically to the contour of the counter roll, so that even without complicated grinding operations reaches a pressure surface in which the desired treatment pressures for the calendering can be achieved.
  • a pressure chamber can also provide several pressure chambers, which are distributed in the axial and / or circumferential direction.
  • the length adjusting device comprises a positioning device for the pressure chamber relative to the counter roll and a pressure adjusting device for a Pressure in the pressure chamber.
  • the treatment pressure of the material web in the nip can be influenced by adjusting the pressure in the pressure chamber.
  • the membrane has openings. Through the openings, a liquid can continuously flow out of the pressure chamber and lubricate the contact between the shell and the membrane. Due to the ongoing flow of liquid, which of course must face a corresponding inflow of liquid, the pressure in the pressure chamber can be set relatively accurately. Additionally or alternatively, one can realize a lubrication between the membrane and the jacket by an external oil supply. In this case, you can leave the oil in the pressure chamber.
  • a dimensionally stable inlet edge is formed in an inlet region of the broad nip.
  • This inlet edge serves to selectively influence the deformation of the shell from convex to concave. For this purpose, it is appropriate in some cases to specify a certain deformation course. This deformation course can then, if you only use the membrane, not for all operating conditions with sufficient certainty control. By using an inlet edge, this is not a problem.
  • the leading edge is formed on a molding and the membrane spans the molding. This results in no gap in the pressurization between the fitting and the remainder of the membrane.
  • the inlet edge is arranged stationary and a pressure chamber on the side facing away from the counter roller limiting frame is movable.
  • the deformation of the roll shell can best be controlled.
  • the pressure chamber is parallel to the axis of the mating roll variable in width.
  • the width of the wide nip in the transverse machine direction, ie perpendicular to the direction of movement of the material web can also be changed. This is particularly advantageous when the mating roll is heated. As a rule, one would like to avoid that the jacket comes into contact with the heated roller. Since the jacket is often formed from a plastic, there is a risk that the jacket is thermally damaged in such contact areas.
  • the pressure shoe As accurately as possible to the width of the material web. As long as the material web between the jacket and the counter roll is arranged, it acts as a thermal insulator. By changing the width of the pressure chamber, the working width of the wide nip can now be adjusted in a simple manner. Outside the width of the pressure chamber, the jacket is no longer supported, so that it can lift off the counter roll.
  • the pressure chamber has walls which cooperate telescopically. Due to the flexibility of the membrane, the surface of the Anpreßschuhan ever remains homogeneous.
  • the pressure chamber has walls which are formed from elastically extensible material.
  • the elasticity is of course not unlimited. With appropriate design, however, the width of the pressure chamber can also be changed within larger limits.
  • the object is achieved in the method of the type mentioned fact that one supports the jacket on a pressure pad and adjusts the working length of the wide nip by changing the position of the pressure pad relative to the backing roll.
  • the counter roll when the pressure pad is located closer to the counter roll, the counter roll then dips further into the membrane and thus into the shell of the shoe roll, so that the working length of the wide nip is changed. If you remove the pressure pad further from the counter roll, the effect is reversed. Then the counter roll will appear less far in the coat, so that the working length is reduced.
  • one limits the pressure pad through a membrane generates the pressure through a liquid and allows the liquid to pass through the membrane.
  • This embodiment has several advantages. As a rule, a relatively high pressure can be generated by a liquid. By allowing the liquid to pass through the membrane, the liquid can be used to lubricate a contact area between the shell and the membrane. Due to the steady outflow of liquid, the pressure in the pressure chamber can be controlled relatively accurately.
  • the jacket can be run over a dimensionally stable inlet edge in the nip.
  • the inlet edge is therefore not changed by a deformation of the membrane.
  • the deformation of the shell from convex to concave can control relatively well and the loads of the shell by the mechanical transformations are kept small.
  • Fig. 1 shows a section of a wide-nip calender 1, which has a shoe roll 2 with a circumferential jacket 3 and a counter-roller 4.
  • the jacket 3 should not bear directly against the counter roll 4, but with the interposition of a material to be satinized web, for example, a web of paper or cardboard, in the Drawing is not shown.
  • a Anpreßschuhan extract 6 is provided which has a pressure shoe 7 which is arranged on a jacket 3 passing through the carrier 8.
  • the carrier 8 is stationary.
  • the lifting device 9 is arranged, which is actuated via a control device 10.
  • the lifting device 9 may be formed, for example, as a piston-cylinder device.
  • a position sensor 11 detects the position of the pressure shoe 7 with respect to the carrier 8.
  • the position of the counter roller 4 to the carrier 8 can be determined in other ways. For example, by sensors arranged outside of the shoe roll 2, the position of the pressure shoe 7 relative to the counter roll 4 can be determined with the aid of the position sensor 11.
  • the position sensor 11 can also be arranged at a different location.
  • the pressure shoe 7 has a pressure chamber 13, which is bounded on the counter roller 4 side facing by an elastic and flexible membrane 14.
  • the diaphragm 14 also forms a part of side walls 15.
  • the pressure shoe 7 has a frame 16, which is formed as a continuous plate and has a connection 17 for supplying a pressurized fluid.
  • the frame 16 is followed by side walls 18, to which the membrane 14 is attached.
  • a pressure sensor 19 is arranged, which is also connected to the control device 10.
  • the jacket 3 of the shoe roll 2 is at its residual stress with the interposition of a material web, not shown, on the counter-roller 4 at.
  • the pressure shoe 7 is not active yet. Now, if the pressure chamber 13 is filled via the terminal 17 with hydraulic fluid and pressurized, then the membrane 14, as shown, initially bulges in the direction of the counter-roller 4.
  • a predetermined working length of the wide nip 5 is set, then the pressure shoe 7 is raised in the direction of the backing roll 4 (the direction refers to the representation of the drawing). In this case, the counter roller 4 (with the interposition of the material web and the jacket 3) immersed in the membrane 14, as in Fig. 3b is shown. If the lifting height is increased to h2, the result is a working length 12 which is greater than the working length 11 of the wide nip 5.
  • control the pressure in the pressure chamber 13 in order to influence the working length 11, 12 and the working pressure in the extended nip 5.
  • the control device 10 depending on a predetermined compressive stress in the nip 5, the pressure in the pressure chamber 13 and the lifting height h1, h2 choose so that the desired working length 11, 12 comes about.
  • the membrane 14 has a certain number of openings through which emerges pressure fluid from the pressure chamber 13 consecutively. This pressure fluid is continuously refilled, so that the pressure in the pressure chamber 13 can be kept constant at the set value.
  • the exiting liquid lubricates the interface between the shell 3 and the membrane 14.
  • the width of the pressure chamber 13 in the transverse machine direction can be changed.
  • the frame 16 and the side walls 18 are formed telescoping.
  • the membrane 14 may have some elasticity, which should preferably be elastic so that the membrane 14 can be lengthened or shortened in cross-machine direction by engaging corresponding tensile or compressive forces.
  • Fig. 2 shows a modified embodiment of a pressure shoe 7, wherein the same parts with the same reference numerals as in Fig. 1 are provided.
  • Added is a fitting 20 which is arranged on the inlet side of the broad nip 5. This molding 20 defines an inlet edge 21 over which the jacket 3 must enter.
  • the leading edge 21 thus defines a path for the deformation that the jacket 3 must perform from convex to concave. Via a corresponding inlet edge 21, the mechanical stress of the shell can be kept relatively small. Movable is only the frame 16. The fitting 20 is held stationary relative to the carrier 8.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (15)

  1. Calandre à pince allongée avec un cylindre à sabot, un cylindre opposé chauffé et une pince allongée formée avec une longueur de travail entre le cylindre à sabot et le cylindre opposé, dans laquelle le cylindre à sabot présente une enveloppe périphérique qui peut être chargée par un agencement de sabot d'application en direction du cylindre opposé, caractérisée en ce que l'agencement de sabot d'application (6) présente un dispositif de réglage de longueur faisant varier la longueur de travail de la pince allongée (5).
  2. Calandre selon la revendication 1, caractérisée en ce que l'agencement de sabot d'application (6) présente au moins une chambre de pression (13), qui est limitée par une membrane flexible (14) au moins sur son côté coopérant avec l'enveloppe (3).
  3. Calandre selon la revendication 2, caractérisée en ce que le dispositif de réglage de longueur comprend un dispositif de positionnement (9-11) pour la chambre de pression (13) par rapport au cylindre opposé (4) et un dispositif de réglage de pression pour une pression dans la chambre de pression (13).
  4. Calandre selon la revendication 2 et 3, caractérisée en ce que la membrane (14) présente des ouvertures traversantes.
  5. Calandre selon l'une quelconque des revendications 2 à 4, caractérisée en ce qu'une arête d'entrée de forme stable (21) est réalisée dans une zone d'entrée de la pince allongée (5).
  6. Calandre selon la revendication 5, caractérisée en ce que l'arête d'entrée (21) est formée sur une pièce profilée (20) et la membrane (14) est tendue sur la pièce profilée (20).
  7. Calandre selon la revendication 5 ou 6,
    caractérisée en ce que l'arête d'entrée (21) est disposée en un endroit fixe et un cadre (16) délimitant la chambre de pression sur le côté situé à l'opposé du cylindre opposé est mobile.
  8. Calandre selon l'une quelconque des revendications 1 à 7, caractérisée en ce que la chambre de pression (13) est variable en largeur parallèlement à l'axe du cylindre opposé (4).
  9. Calandre selon la revendication 8, caractérisée en ce que la chambre de pression (13) comporte des parois (15), qui coopèrent de manière télescopique.
  10. Calandre selon la revendication 8 ou 9, caractérisée en ce que la chambre de pression (13) comporte des parois (15), qui sont réalisées en une matière élastiquement déformable.
  11. Procédé pour satiner une bande de matière dans une pince allongée, qui est formée entre une enveloppe d'un cylindre à sabot et un cylindre opposé chauffé, dans lequel on charge l'enveloppe à l'aide d'un agencement de sabot d'application en direction du cylindre opposé, caractérisé en ce que l'on appuie l'enveloppe sur un coussin sous pression et on règle la longueur de travail de la pince allongée, en faisant varier la position du coussin sous pression par rapport au cylindre opposé.
  12. Procédé selon la revendication 11, caractérisé en ce que l'on accorde la pression du coussin sous pression à la position du coussin sous pression.
  13. Procédé selon la revendication 11 ou 12, caractérisé en ce qu'on limite le coussin sous pression par une membrane, on produit la pression au moyen d'un liquide et on laisse s'écouler le liquide à travers la membrane.
  14. Procédé selon l'une quelconque des revendications 11 à 13, caractérisé en ce que l'on règle la largeur de travail de la pince allongée en faisant varier la largeur du coussin sous pression.
  15. Procédé selon l'une quelconque des revendications 11 à 14, caractérisé en ce que l'on fait pénétrer l'enveloppe dans la pince allongée par l'intermédiaire d'une arête d'entrée de forme stable.
EP20050100479 2004-04-01 2005-01-26 Calandre à pince allongée et procédé pour lisser une bande dans un calandre à pince allongée Expired - Lifetime EP1582625B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004015997 2004-04-01
DE200410015997 DE102004015997A1 (de) 2004-04-01 2004-04-01 Breitnip-Kalander und Verfahren zum Satinieren einer Materialbahn in einem Breitnip

Publications (2)

Publication Number Publication Date
EP1582625A1 EP1582625A1 (fr) 2005-10-05
EP1582625B1 true EP1582625B1 (fr) 2008-11-26

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Application Number Title Priority Date Filing Date
EP20050100479 Expired - Lifetime EP1582625B1 (fr) 2004-04-01 2005-01-26 Calandre à pince allongée et procédé pour lisser une bande dans un calandre à pince allongée

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EP (1) EP1582625B1 (fr)
DE (2) DE102004015997A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI65103C (fi) * 1982-05-05 1984-03-12 Tampella Oy Ab Laongzonspress foer en pappersmaskin
DE4409316C1 (de) * 1994-03-18 1995-06-29 Escher Wyss Gmbh Langspaltpressvorrichtung zur Behandlung einer Faserstoffbahn
DE4423694C2 (de) * 1994-07-06 2000-03-16 Voith Sulzer Papiermasch Gmbh Langspaltpresse
FI113788B (fi) * 1999-04-14 2004-06-15 Metso Paper Pori Oy Puristin

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DE502005006036D1 (de) 2009-01-08
EP1582625A1 (fr) 2005-10-05
DE102004015997A1 (de) 2005-10-20

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