EP2194187A1 - Calandre - Google Patents

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Publication number
EP2194187A1
EP2194187A1 EP09173498A EP09173498A EP2194187A1 EP 2194187 A1 EP2194187 A1 EP 2194187A1 EP 09173498 A EP09173498 A EP 09173498A EP 09173498 A EP09173498 A EP 09173498A EP 2194187 A1 EP2194187 A1 EP 2194187A1
Authority
EP
European Patent Office
Prior art keywords
layer
elastic
calender
rolls
rollers
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.)
Withdrawn
Application number
EP09173498A
Other languages
German (de)
English (en)
Inventor
Jörg Rheims
Lothar Zimmermann
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 EP2194187A1 publication Critical patent/EP2194187A1/fr
Withdrawn legal-status Critical Current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
    • D21G1/02—Rolls; Their bearings
    • D21G1/0233—Soft rolls
    • 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
    • D21G1/0253—Heating or cooling the rolls; Regulating the temperature
    • D21G1/028—Heating or cooling the rolls; Regulating the temperature using electrical means

Definitions

  • the invention relates to a calender, in particular for the treatment of a paper web, with a roll stack of at least three rolls and with at least one double soft nip, which is formed by two rolls with heatable, elastic surface.
  • Such a calender is for example off EP 0 945 546 A2 known.
  • Calenders of this type have two primary roles in papermaking. You have to consolidate the paper web. On the other hand, they should produce certain surface properties, for example the highest possible gloss and the highest possible smoothness.
  • the out EP 0 945 546 A2 known calender in this case has a roll stack with a top roll, a bottom roll and so-called center rolls.
  • the center rollers are all identical and can be heated. They have a smooth surface. They are usually designed as steel or cast rolls and have an elastic surface made of a thermally conductive material. The smooth surface "impresses" into the surface of the paper web and gives it the desired smoothness and, together with the heat generated by the heating, the desired gloss. Due to the "softness" of the center rollers, the paper web is evenly compressed. Since their surface is elastic, so can yield to a certain extent, in this case a crushing of the fibers of the paper web is avoided.
  • the invention has for its object to improve the possibility of action on the web.
  • This object is achieved in a calender of the type mentioned in that at least one of the double soft nip forming rollers is provided with an additional, applied by a high-speed flame spraying metallic layer with a thickness less than 80 microns.
  • the metallic layer has been produced by a high velocity oxy fuel (HVOF) process.
  • HVOF high velocity oxy fuel
  • the material solidifies on the surface and then forms the further layer.
  • the high-speed flame spraying one is relatively free in the design of the surface, ie one can produce a relatively wear-resistant layer, which moreover has the advantage of being relatively smooth, so that the calendering of a web, by one with the help of the roller formed Nip is running, being improved.
  • a layer thickness of less than 80 ⁇ m saves a great deal of material compared with the metallic coatings of the prior art and is therefore cheaper.
  • the production of such a roll is, for example, compared to chromed coatings with copper substructure (as it was already tested in tests) much easier.
  • the thin layer follows without its own compression, so that the paper web in Doppelweichnip is subjected to practically the same compressive stress as in a nip or nip with a conventional soft and a hard roll.
  • DE 10 2008 037 999 referenced by the applicant.
  • Another advantage of the invention is given by the fact that there is no more abrasion on the surface of the elastic jacket.
  • the metallic layer accordingly receives the task of a protective layer for the elastic sheath.
  • nip In one of the two rollers with elastic and flame-sprayed metallic surface, ie the two soft rolls, limited nip can be entered by the increased temperature of both sides energy in the web, so that a uniform compression of the web is possible. Due to this additional function, it is no longer a conventional interchangeable gap. This nip is therefore referred to as a "double soft nip". Due to the elevated temperature, the nip, which is formed by two rolls and would be lost for the processing of the material web, can now also be used for the processing. In extreme cases, one can omit one of the remaining nips in such a configuration, so that under certain circumstances, the height of the calender can be reduced. This saves a considerable amount of costs.
  • the surface of at least one roller forming a double soft nip preferably has a smooth surface whose mean roughness Ra does not exceed 0.1 ⁇ m under operating conditions.
  • a smooth surface can be realized in conjunction with a metallic, preferably flame-sprayed layer provided elastic roller.
  • the material web can be compacted in the one or more double soft nips and smoothed on both sides, which possibly makes it possible to save further nips or nips in the calender.
  • the two-sidedness of the material web can be considerably reduced.
  • the flame-sprayed metallic layer is heated by means of external heating. It is preferably just enter the amount of heat in the layer just before the nip, which is then removed from the paper web.
  • the jacket below the metallic layer which is usually made of a fiber-reinforced plastic, spared from excessive heating. Induction heaters or infrared heaters are ideal as outdoor heaters.
  • At least all intermediate rolls between the upper and lower rolls of the roll stack have an additional metallic layer with a thickness of less than 80 ⁇ m.
  • the calender then has apart from the inlet and the outlet gap, only Doppelweichnips.
  • in conjunction with the smooth surfaces of the metallic flame-sprayed elastic rollers can be achieved with few Doppelweichnips excellent results, so you can make do with a few rolls.
  • center rolls are formed identically. There is no longer a distinction between hard and soft rollers, which makes storage considerably easier. Of course, the center rolls may have some differences, for example in terms of diameter. But they are interchangeable.
  • a calender 1 has a roll stack of several rolls, here six rolls. In detail, it is a top roller 2 at the top position and a bottom roller 3 at the lowest position. Top roller 2 and bottom roller 3 may be formed as deflection adjusting rollers, which by pressure shoes 4, 5, for example, work hydrostatically can, is implied. Between the top roller 2 and the bottom roller 3, four center rollers 6-9 are arranged. The center rollers 6-9 have a substantially similar construction. At best they differ in diameter.
  • Each center roller 6-9 has an elastic jacket 10 surrounding a core 11.
  • the core 11 is hard, i. It is made of steel or cast iron or a similar material.
  • the elastic sheath 10 is formed of a plastic which is relatively soft and elastic. If the elastic jacket has sufficient rigidity, it may be possible to dispense with the metallic core 11, so that the roller is basically formed from the elastic jacket 10 and is hollow on the inside.
  • the elastic jacket has an inventive metallic additional layer 13 with a thickness of less than 80 microns.
  • This slit layer 13 can be made even smoother than the elastic sheath 10. The smoothness corresponds to that of a conventional hard calender roll, but nevertheless the roll has remained elastic.
  • the metallic layer is also a protective layer for the elastic sheath.
  • the material forming the metallic layer 13 has a good thermal conductivity, so that heat supplied via an external heater 23 is rapidly distributed to a uniform temperature level.
  • cooling lines 12 are provided in the elastic jacket or in the core of the rolls. It is optimal, however, if the metallic layer 13 is supplied by the external heater 23 exactly as much heat as on the one hand to the web 18 and on the other hand by convection and radiation of the roller (6 -9) is discharged to the environment. At least the medium flowing through the cooling line 12 should ensure that the Temperature difference between shell 10 and core 11 is not too large. A temperature range of the medium between 40 and 80 ° C is advantageous here.
  • the top roll 2 and the bottom roll 3 are formed with "hard” roll jackets 14, 15. Between the top center roll 6 and the top roll 2 and between the bottom center roll 9 and the bottom roll 3, therefore, conventional "soft" nips or nips 16, 17 are formed.
  • the remaining three nips 19-21 are always bounded by two rollers 6-9, which have an elastic, provided with a metallic layer 13 surface. They therefore form double soft nips 19-21.
  • Each double soft nip 19-21 is heated by outdoor heaters 23.
  • outdoor heaters for example, inductive heaters or infrared heaters have been proven.
  • the center rollers 6-9 all have a very smooth surface, ie under operating conditions their average roughness Ra does not exceed 0.5 ⁇ m. It can even be kept at 0.1 ⁇ m or less, as a rule. Due to the small thickness of the metallic layer 13, the center rollers 6-9 have almost the performance of a soft roller, wherein due to the elastic surface formed by the elastic sheath 10, fibers of the paper web are not crushed.
  • the elastic jacket 10 may be formed of a material having an E-modulus of 7,000 N / mm 2 or less.
  • the center rolls may also be constructed as described in the published German patent application 197 10 573 is described and then be provided with a metallic spray coating.
  • a calender 1 can be achieved even with a few Doppelweichnips excellent results in terms of calendering.
  • the paper web 18 is not only compacted, it also obtains excellent smoothness and gloss due to the smooth surfaces of the "soft" rolls in the double soft nips 19-21. Since one can often save in this way one or more nips or nips of a conventional calender, a considerable cost saving is achieved by the use of the double soft nips.
  • the invention should not preclude that the upper and lower rollers (2, 3) has an elastic jacket, which may also be provided with a metallic layer.

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  • Paper (AREA)
EP09173498A 2008-12-05 2009-10-20 Calandre Withdrawn EP2194187A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810044369 DE102008044369A1 (de) 2008-12-05 2008-12-05 Kalander

Publications (1)

Publication Number Publication Date
EP2194187A1 true EP2194187A1 (fr) 2010-06-09

Family

ID=41382475

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09173498A Withdrawn EP2194187A1 (fr) 2008-12-05 2009-10-20 Calandre

Country Status (3)

Country Link
EP (1) EP2194187A1 (fr)
CN (1) CN201686895U (fr)
DE (1) DE102008044369A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2314764A1 (fr) * 2009-10-20 2011-04-27 Voith Patent GmbH Calendre

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010029615A1 (de) 2010-06-02 2011-12-08 Voith Patent Gmbh Verfahren zur Herstellung einer gestrichenen, mehrlagigen Faserstoffbahn
EP2573260B1 (fr) 2011-09-20 2015-05-13 Dirk Richter Rouleau et procédé de revêtement de rouleau

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4126232A1 (de) 1991-05-03 1992-11-12 Escher Wyss Gmbh Durchbiegungseinstellwalze
DE19710573A1 (de) 1997-03-14 1998-09-24 Voith Sulzer Finishing Gmbh Kalander
EP0945546A2 (fr) 1998-03-27 1999-09-29 Voith Sulzer Papiertechnik Patent GmbH Calandre, en particulier pour le traitement d' une bande de papier
EP1057930A2 (fr) * 1999-06-02 2000-12-06 Voith Sulzer Papiertechnik Patent GmbH Rouleau élastique et procédé de fabrication d' un tel rouleau
EP1057931A2 (fr) * 1999-06-02 2000-12-06 Voith Sulzer Papiertechnik Patent GmbH Rouleau élastique et procédé de fabrication d' un tel rouleau
EP1363034A1 (fr) * 2002-05-13 2003-11-19 Voith Paper Patent GmbH Rouleau de lissage élastique et son procédé de fabrication
DE102008037999A1 (de) 2008-08-16 2010-02-18 Voith Patent Gmbh Verfahren zum Herstellen einer Kalanderwalze und Kalanderwalze

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4126232A1 (de) 1991-05-03 1992-11-12 Escher Wyss Gmbh Durchbiegungseinstellwalze
DE19710573A1 (de) 1997-03-14 1998-09-24 Voith Sulzer Finishing Gmbh Kalander
EP0945546A2 (fr) 1998-03-27 1999-09-29 Voith Sulzer Papiertechnik Patent GmbH Calandre, en particulier pour le traitement d' une bande de papier
EP1057930A2 (fr) * 1999-06-02 2000-12-06 Voith Sulzer Papiertechnik Patent GmbH Rouleau élastique et procédé de fabrication d' un tel rouleau
EP1057931A2 (fr) * 1999-06-02 2000-12-06 Voith Sulzer Papiertechnik Patent GmbH Rouleau élastique et procédé de fabrication d' un tel rouleau
EP1363034A1 (fr) * 2002-05-13 2003-11-19 Voith Paper Patent GmbH Rouleau de lissage élastique et son procédé de fabrication
DE102008037999A1 (de) 2008-08-16 2010-02-18 Voith Patent Gmbh Verfahren zum Herstellen einer Kalanderwalze und Kalanderwalze

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2314764A1 (fr) * 2009-10-20 2011-04-27 Voith Patent GmbH Calendre

Also Published As

Publication number Publication date
DE102008044369A1 (de) 2010-06-10
CN201686895U (zh) 2010-12-29

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