EP1801287A1 - Calandre - Google Patents

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Publication number
EP1801287A1
EP1801287A1 EP06122750A EP06122750A EP1801287A1 EP 1801287 A1 EP1801287 A1 EP 1801287A1 EP 06122750 A EP06122750 A EP 06122750A EP 06122750 A EP06122750 A EP 06122750A EP 1801287 A1 EP1801287 A1 EP 1801287A1
Authority
EP
European Patent Office
Prior art keywords
roller
elastic
rollers
calender
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.)
Granted
Application number
EP06122750A
Other languages
German (de)
English (en)
Other versions
EP1801287B1 (fr
Inventor
Ulrich Rothfuss
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1801287A1 publication Critical patent/EP1801287A1/fr
Application granted granted Critical
Publication of EP1801287B1 publication Critical patent/EP1801287B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D21G1/02—Rolls; Their bearings
    • D21G1/0233—Soft rolls

Definitions

  • the invention relates to a calender having at least three rollers whose axes are arranged in a press plane, wherein each adjacent rollers form a nip between them, wherein at least some of the rollers are provided with an elastic coating, and with a control device for opening and closing the nips ,
  • the invention further relates to a method of calendering with this calender.
  • Calenders are used to treat webs, in particular for glazing paper webs.
  • the invention will be described below with reference to a paper calender, without being limited to this application.
  • the paper web is passed through the calender and pressurized in the nips, which are also referred to as "nips", and optionally also at an elevated temperature.
  • the type of pressure treatment in the calender determines the surface properties of the material web. It can be ascertained in a first approximation that the number of nips also improves the quality of the surface.
  • the invention has for its object to increase the flexibility in the calendering of different widths of material webs with less effort.
  • a calender of the aforementioned type according to claim 1 characterized in that at least one of the elastic rollers has a wider, ie in the axial length of the roller longer elastic covering than at least one other elastic roller of the calender.
  • the task is done according to Claim 10 in a method for calendering a web of material with a calender achieved in that the rollers are adjusted so that nips are open in addition to at least one closed nip, wherein at least one of the elastic rollers involved in the formation of a closed nip, through which the material web is guided, a wider, ie in the axial length of the roller longer elastic covering than at least one elastic roller, which is involved in the formation of an open nip.
  • the calender can both operate so that several nips are closed for a narrower material web, in which it is pressurized. This leads to a relatively high surface quality.
  • the calender can also be operated so that not all nips are closed for wider webs.
  • the closed nips are formed with at least one elastic roller, the covering of which has the same length as that of the elastic rollers forming an open nip, one now goes the way, these rollers with a broader covering to provide. In this way, in the normally one or two closed nips, webs of greater width can be calendered, and a less wide marginal strip must be cut off.
  • cooling means are provided in front of an elastic roller with a broader elastic coating on the edge, which act on the covering. If narrower webs, which are slightly wider than the narrower coverings, are driven through all the nips, it may be that when the rollers with the longer linings are used, they will survive at the ends of the paper web and will be in danger of coming into contact with the adjacent heating rollers to get. Therefore, the elastic pads are cooled at the edge by the cooling device in this way.
  • a closed nip is formed by at least one of the two outer roller pairs. This simplifies the control of the rolls. In many calenders is provided anyway that the rollers are driven apart can, so that all nips are opened, for example, to insert the paper web. If the two outer pairs of rollers form the closed nips, then it is sufficient to close the nips when two rollers are moved.
  • the two end rollers are formed as Naturalbiegeeinstellwalzen. It is thus achieved that the two closed nips can be subjected to compressive forces which go beyond the forces necessary to compensate for the net weight of the rolls. A transverse profiling is also possible. This extends the treatment option.
  • At least one of the elastic rollers with a wider elastic lining is driven.
  • the treatment of the material web in both nips is possible without the material web is exposed to unacceptably high tensile forces.
  • all rollers have their own drive and at least the drives of the rollers, which limit the open nips, are individually controllable. These drives can then, if the nips remain open, be stopped, so that the rollers no longer rotate.
  • an elastic roller with a wider covering or its adjacent roller, with which the elastic roller forms a nip, fixed in the stator This also simplifies the control. In order to produce the closed nip, only the other roller has to be introduced and, if appropriate, pressurized.
  • At least one nip a roller can be locked, and the other roller has a pressure transducer on a lever. To close the nips, therefore, only a single roll movement is necessary. The other roller is fixed.
  • the pressure transducer acts on one end of a two-armed lever, at the other end of which the other roller is arranged. This provides enough space for the pressure transducer. The leverage can still be exploited to ensure a suitable application of force in the nip.
  • a roller is formed as a roller with Mantelhub. This is a possibility that can be chosen as an alternative or in addition to the use of a pressure transducer on the two-armed lever. In the case of a roll with a jacket stroke, the necessary pressure in the nip is created by moving the entire roll shell.
  • At least one nip is formed as a soft nip, which is produced by two adjacent rollers provided with elastic lining.
  • a calender 1 has in a frame 2 six rollers 3 to 8, whose axes are superimposed in a press plane 9.
  • nips or nips 10-14 Each adjacent rolls form nips or nips 10-14.
  • rollers 3-8 When rollers 3-8 are driven apart, nips 10-14 are opened.
  • rolls 3-8 When rolls 3-8 are collapsed, nips 10-14 are closed.
  • the upper roller 3 in the frame 2 fixed, the middle rollers 4-7 are suspended on levers 15-18 in the frame 2, and the lowermost roller 8 is movable in a carriage 19 in the frame 2 and is driven by a lifting cylinder 20.
  • the lifting cylinder 20 is lowered, the levers 15-18 can be pivoted so far down that they rest on not shown stops.
  • the material web can be treated with pressure and possibly an elevated temperature.
  • the lowermost roller 8 and optionally the uppermost roller 3 are formed as deflection adjustment rollers.
  • the rollers 3, 5, 6 and 8 have an elastic surface reference, so that the nips 10, 11 and 13, 14 are formed as so-called soft nips.
  • the middle nip 12 is formed as a so-called alternating gap, i. here are two soft rolls opposite.
  • pulleys 22-26 are provided, which serve to guide a material web 21 through the calender 1.
  • the material web 21 can now be treated in an operating mode which is known per se in all nips 10-14. In this case, it is usually a narrower material web, which receives the designation 21 a in FIG. However, the material web can also, as shown in Fig. 1, be treated so that it is only in two nips, namely the nips 10 and 14, treated. In this case, it is usually a wider material web, which receives the name 21 b in FIG.
  • the rollers 3-8 of the calender 1 are set so that only the rollers 3 and 4 are pressed against each other and the rollers 7 and 8. Accordingly, the nips 11-13 are opened and only the nips 10 and 14 are closed. This makes it possible to treat the material web 21 in two soft nips 10 and 14 so that each side of the material web 21 once against a soft roller.
  • the pulleys 24 and 26 serve to pass the material web 21 to the nips 12 and 13.
  • the nip 11 is run through, without here a treatment of the material web takes place.
  • the top roller 3 is fixed in the frame 2.
  • the second uppermost roller 4 is mounted on an arm of a two-armed lever 15. At the other arm engages a pressure transmitter 27.
  • the pressure transmitter 27 which may be formed, for example, as a piston-cylinder unit moves the arm of the lever 15 down, then the roller 4 is pressed up against the roller 3. Since the top roller 3 is formed as a deflection adjustment, one can choose the pressure forces generated by the pressure transducer 27, in relatively wide ranges freely.
  • the lever 18, on which the roller 7 is mounted is locked in the lowered position, in which the remaining nips 11-13 are opened, by means of a locking device 28 relative to the frame 2.
  • the nip 14 is then closed by the lifting cylinder 20 lifting the lowermost roller 8. Since the bottom roller 8 is formed as a deflection adjustment, you can also choose the forces relatively freely here.
  • All rollers 3-8 have their own drive 29-34, wherein at least the drives of the rollers 5 and 6 are controllable independently of the other drives. They can then be stopped when the rollers 5 and 6 due to the open nips 11 to 13 during the treatment of the material web 21 must not come into action.
  • calender 1 can be used to perform full calendering in five nips 10-14 to achieve a high surface finish, ie to produce a paper web having high gloss and smoothness values, as well as, as shown in FIG , treat the web 21 only in two nips, so that a diminished Surface quality is obtained, but sufficient for many uses perfectly.
  • the rollers 3 and 8 have a broader elastic covering than the rollers 5 and 6. These two nips drive a wider material web 21 in the exemplary embodiment. Since the material web 21 is generally slightly wider than the covering, the edge trimming, which is arranged after the calender and is not shown in the drawing, is significantly less than if the wider material web were guided through nips which have only the narrower coverings. If subsequently a better product quality is desired, the material web, which is adapted to the width of the narrower linings on rolls 5 and 6, can be driven through all the nips. For this purpose, it is advisable to cool the longer linings of the rollers 3 and 8 at the edge, which can be done for example via not shown in the drawing but known Blas Kunststoffkühlung.
  • FIG. 2 shows a schematic representation of how, in the prior art, different material web widths are used in comparison to the invention. Symbolically, the length of the elastic rollers 3, 5, 6, 8, or more precisely their coverings, indicated by a crossed hatching. The heating rollers 4 and 7 are striked, and the width of the material web 21, 21 a, 21 b is represented by a hatched box. The two superimposed representations on the left correspond to the new invention, the two superimposed representations on the right show the state of the art.
  • the upper representation represents the passage of a narrower paper web through all the nips, while the lower two shows the calendering of a wider web in only two nips (the middle nips are shown open without material web).
  • the finished web width 41a is like that of the prior art. However, for the not so high-quality, slightly broader papers, because of the larger covering length of the involved elastic roller 3 and 8 in the first and last nip, the edge trim 38 can be pulled much farther outwards and the waste is considerably less.
  • the finished web width 41 b is increased in this case, which increases the production amount of salable paper per unit time over the prior art.
  • the invention should not be limited to elastic rollers having on a solid body (pipe) an elastic coating, but also apply to elastic rollers in which the entire roll shell consists of an elastic material.

Landscapes

  • Paper (AREA)
  • Lubricants (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
EP06122750A 2005-12-20 2006-10-23 Calandre Not-in-force EP1801287B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005060815A DE102005060815A1 (de) 2005-12-20 2005-12-20 Kalander

Publications (2)

Publication Number Publication Date
EP1801287A1 true EP1801287A1 (fr) 2007-06-27
EP1801287B1 EP1801287B1 (fr) 2008-08-06

Family

ID=37770954

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06122750A Not-in-force EP1801287B1 (fr) 2005-12-20 2006-10-23 Calandre

Country Status (3)

Country Link
EP (1) EP1801287B1 (fr)
AT (1) ATE403775T1 (fr)
DE (2) DE102005060815A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2670577B1 (fr) 2011-02-03 2021-04-07 battenfeld-cincinnati Germany GmbH Dispositif de refroidissement et procédé de refroidissement d'un produit d'extrusion

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2218434A (en) * 1988-03-15 1989-11-15 Valmet Paper Machinery Inc Calendering method and apparatus
EP0890676A1 (fr) * 1997-07-10 1999-01-13 Voith Sulzer Finishing GmbH Calandre
WO2001073306A1 (fr) * 2000-03-31 2001-10-04 Metso Paper, Inc. Procede de reduction de la difference de temperature entre la partie peripherique et la portion marginale de la partie centrale d'un revetement polymerique sur un cylindre et materiel de mise en oeuvre

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2218434A (en) * 1988-03-15 1989-11-15 Valmet Paper Machinery Inc Calendering method and apparatus
EP0890676A1 (fr) * 1997-07-10 1999-01-13 Voith Sulzer Finishing GmbH Calandre
WO2001073306A1 (fr) * 2000-03-31 2001-10-04 Metso Paper, Inc. Procede de reduction de la difference de temperature entre la partie peripherique et la portion marginale de la partie centrale d'un revetement polymerique sur un cylindre et materiel de mise en oeuvre

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2670577B1 (fr) 2011-02-03 2021-04-07 battenfeld-cincinnati Germany GmbH Dispositif de refroidissement et procédé de refroidissement d'un produit d'extrusion

Also Published As

Publication number Publication date
DE102005060815A1 (de) 2007-06-28
ATE403775T1 (de) 2008-08-15
DE502006001273D1 (de) 2008-09-18
EP1801287B1 (fr) 2008-08-06

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