EP1318237A2 - Procédé et calandre pour le satinage d' une bande de papier ou carton - Google Patents

Procédé et calandre pour le satinage d' une bande de papier ou carton Download PDF

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Publication number
EP1318237A2
EP1318237A2 EP02026040A EP02026040A EP1318237A2 EP 1318237 A2 EP1318237 A2 EP 1318237A2 EP 02026040 A EP02026040 A EP 02026040A EP 02026040 A EP02026040 A EP 02026040A EP 1318237 A2 EP1318237 A2 EP 1318237A2
Authority
EP
European Patent Office
Prior art keywords
nip
nips
pressure
web
calender
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
EP02026040A
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German (de)
English (en)
Other versions
EP1318237A3 (fr
EP1318237B1 (fr
Inventor
Rüdiger Dr. Kurtz
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 Paper Patent GmbH
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Publication date
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Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1318237A2 publication Critical patent/EP1318237A2/fr
Publication of EP1318237A3 publication Critical patent/EP1318237A3/fr
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Publication of EP1318237B1 publication Critical patent/EP1318237B1/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
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus

Definitions

  • the invention relates to a method for calendering a Paper or cardboard web in which the web passes through out several nips of a roll stack and into the Nips is pressurized. Furthermore, the Invention a calender for satinizing a paper or Cardboard web with a roll stack of several Rolls that form nips between themselves and with means to influence a pressure load in the nips.
  • Paper and cardboard webs are used in their manufacture usually satined, i.e. they are through a calender passed and in the trained there between rollers Nips with increased pressure and often with elevated temperature.
  • the nips are in the Usually designed as so-called soft nips, i.e. she are characterized by a "hard” roller and a “soft” roller limited.
  • the soft roller has a coating of one elastomeric plastic.
  • the paper rolls used earlier are practically not in newer calenders used more.
  • the invention is based, if possible uniform compression of the web in the nips to reach.
  • This task is carried out in a method of the type mentioned at the beginning Art solved in that the pressure load at least is limited to a value in the first nip at which the compression of the web in the plastic-elastic Area.
  • the plastic-elastic area is known from Rodal, J.A .: Soft-Nip Calendaring of Paper and Paperboard, TAPPI Proceedings, 1988, Finishing and Converting Conference, Pp. 77-84. You start with the assumption that too high a line force in the nip, which is the highest possible Compaction with the highest possible gloss and smoothness values combined, in many cases to negative results for the paper regarding black satin, paper / cardboard stains and in the follow-up process to pressure mottling and lead to pressure drops.
  • the pressure load in all Nips can be limited to values at which compression the web takes place in the plastic-elastic area.
  • the positive results of compression from the first So nip will not be in the following nips again impaired.
  • the paper web can be compressed, without compressing the paper web too much.
  • the first nip at least approximately same compression work as in subsequent nips done.
  • the thickness of the paper decreases from nip to nip and thus the density increases.
  • the compressive stress increase in the nips it is therefore necessary to have the compressive stress increase in the nips. Still, you can do it ensure that the compression in the plastic-elastic Area takes place.
  • the specific pressure of nip preferably increases Nip on. This is a relatively easy way to get around the compaction work in the nips is approximately the same hold.
  • Nip has a hardness in the range of 80 to 90 Shore D, for example 86 Shore D.
  • Nips takes the hardness and the modulus of elasticity of the pads gradually and in such a way that despite the increasing specific pressure in the nip due to the higher bed number and density of the paper the compression takes place in the plastic-elastic range and almost the same compression work as in the previous and subsequent nip becomes.
  • the use of rubbers of different hardness is a relatively simple means.
  • Shoe rollers are preferably used as the soft rollers with pressure shoes, the pressure shoe in the first Nip has the greatest contact length.
  • the shoe rollers preferably have very soft coats, especially those shoe roller that limits the first nip.
  • the hardness is greater than 0 P&J.
  • the pressure shoe has a concave pressure surface on that is adapted to the curvature of the counter roll is. The longer the pressure shoe in the circumferential direction the shoe roller is the lower at the same Contact pressure the surface pressure in the wide nip, which is formed between the shoe roller and the counter roller is.
  • the task is also done by a calender of the beginning mentioned type solved by the fact that the means the pressure load on at least one in the first nip Set the value at which the web is compressed in the plastic-elastic area takes place.
  • the roll stack preferably has hard and soft Rollers and the soft rollers have deposits, whose hardness increases from nip to nip. This is a relative one easy way in successive nips to do the same compaction work and still to ensure that the compression in the plastic-elastic Area.
  • the hardness of the surface in the first Nip is in the range of 80 to 95 Shore D.
  • the hardness is around 86 Shore D.
  • the means for adjusting the pressure load are preferably intended and increased separately for each nip the pressure load from nip to nip. So that's a very sensitive control of the compression work in the individual nips possible.
  • the soft rollers are preferably in the form of shoe rollers trained against a by a pressure shoe have a mating roller pressed jacket, wherein the working length of the pressure shoe in the first nip on greatest is.
  • the working length i.e. the Length of the pressure shoe in the circumferential direction of the shoe roller.
  • the diameter can the hard rollers from nip to nip. This too is one way to increase the compressive stress and thus the one required for the same compression work take care of higher compressive stress.
  • Fig. 1 shows a calender 1 in only schematic Presentation.
  • the calender 1 has a roll stack with several rollers 2-8, between each Nips 9-14 are formed. In the present embodiment the calender has seven rolls. in the Basically, the calender can be any Have number of rollers in the range of four to twenty.
  • the first roller is 2, the third Roller 4, the fourth roller 6 and the fifth roller 8 as elastic roller formed, i.e. these rollers point a covering 15-18 that is softer than the surface the respectively adjacent hard roller 3, 5, 7.
  • Die hard rolls 3, 5, 7 are as steel or cast rolls educated.
  • Means 19 are shown only schematically provided to press the rollers 2-8 against each other and so generate a line load in the nips 9-14.
  • the line load increases due to its own weight rollers 2-8 from top to bottom.
  • This Rise can also be limited only schematically represented means 20 (only with the roller 3 shown, but in principle also for the rollers 4-7 present) with which the weight of the rollers and the weight of so-called overhanging loads like not Guide rollers shown in detail, can compensate.
  • the top roller 2 has a very soft and very elastic covering 15, which has a hardness of 86 Shore D having. The hardness is preferably in the range from 80 to 90 Shore D.
  • the surface 16, the next Nip 10 determined is harder.
  • the covering 17 is in turn harder than the pad 16 and the pad 18 is harder than the covering 17.
  • the line forces in the nips 9-14 are now set so that the pressure load in the first nip 9 on one Value is limited at which the compression of a through the paper or cardboard web guided by the nips 9-14 in the plastic-elastic range. Even in the subsequent nips 10-14, the compressive stress is controlled so that the compression of the paper or cardboard web only in the plastic-elastic range.
  • the compressive stress can vary from nip to nip quite increase because the bedding number of the paper web in press nips 10-14, defined as line force / paper thickness increases with increasing compression. The Paper web can thus in the successor nips without displacement defects are burdened higher in the paper than in previous nips.
  • Fig. 2 shows an alternative embodiment in which same parts are provided with the same reference numerals.
  • coverings 15-18 can do all of these have the same hardness.
  • the increase in compressive stress in the individual nips is realized in that the Decrease the diameter of the hard rolls 3, 5, 7, i.e. the hard roller 3 delimiting the first nip 9 has the largest diameter.
  • the diameter of the hard roller 5 is smaller than the diameter of the hard roller 3 and the diameter of the hard roller 7 is smaller than that Diameter of the hard roller 5 the compressive stresses and thus the loads on the Increase paper web from nip to nip so that in all Nips did essentially the same compaction work becomes.
  • the jacket 29 can be of different types be trained.
  • One possibility is the use a relatively stiff jacket that is elastic enough to match the curvature of the opposite hard roller 3, 5, 7 to adjust, but otherwise practical rotates like a roller. This coat can be provided with washers on the front.
  • Another One option is to use a less rigid one Belt that is circulated over support rollers with the pulleys practically defining a polygon. Such a band can also be relatively thin his.
  • the jacket 29 is independent of how stiff it is, usually formed from a plastic. To one if possible low-friction sliding of the jacket 29 over the Pressure shoe 30, 30a, 30b to ensure are in the Support surface 31 of the pressure shoe 30 lubrication devices provided, usually hydrostatic lubrication.
  • the effective length increases the pressure shoes 30, 30a, 30b from nip to nip.
  • the first nip 9 has the circumferential direction of the jacket 29 longest contact shoe 30. So there is otherwise unchanged conditions in the first nip 9 the lowest compressive stress.
  • the second nip 10 is the length of the pressure shoe 30a smaller. This increases the Compression in the second nip 10.
  • the third nip 11 there is the length of the pressure shoe 30b again smaller, so that the compressive stress in the third nip 11 is again higher than in the second nip 10. This continues.
  • the calender 1 also becomes one Have alternating gap (not shown) in which two soft rollers together form a nip.
  • This Alternating gap is provided so that both sides of the paper or cardboard web against hard rollers.
  • the position of the alternating gap is for the present operating mode of minor importance.
  • the paper or cardboard web is treated so that the deformation remains in the plastic-elastic range.

Landscapes

  • Paper (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
EP20020026040 2001-11-30 2002-11-22 Procédé et calandre pour le satinage d' une bande de papier ou carton Expired - Lifetime EP1318237B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10158910 2001-11-30
DE2001158910 DE10158910B4 (de) 2001-11-30 2001-11-30 Verfahren und Kalander zum Satinieren einer Papier- oder Kartonbahn

Publications (3)

Publication Number Publication Date
EP1318237A2 true EP1318237A2 (fr) 2003-06-11
EP1318237A3 EP1318237A3 (fr) 2005-02-02
EP1318237B1 EP1318237B1 (fr) 2006-08-02

Family

ID=7707612

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020026040 Expired - Lifetime EP1318237B1 (fr) 2001-11-30 2002-11-22 Procédé et calandre pour le satinage d' une bande de papier ou carton

Country Status (2)

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EP (1) EP1318237B1 (fr)
DE (2) DE10158910B4 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004029261B4 (de) † 2004-06-17 2006-05-18 Papierfabrik August Koehler Ag Verfahren zur Herstellung eines wärmeempfindlichen Aufzeichnungsmaterials sowie ein durch das Verfahren hergestelltes Aufzeichnungsmaterial

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4026774A1 (de) * 1990-08-24 1992-03-05 Voith Gmbh J M Mehrwalzen-glaettwerk
DE19508350C1 (de) * 1995-03-09 1996-04-04 Voith Sulzer Finishing Gmbh Kalander zur Bearbeitung von Papier und Pappe mit einem Walzenstapel
WO1998050628A1 (fr) * 1997-05-07 1998-11-12 Valmet Corporation Procede et disposition permettant de calculer et de reguler la distribution de charge lineaire dans une calandre a multiples pinces et calandre a multiples pinces

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19803323C2 (de) * 1998-01-29 2003-06-05 Voith Paper Patent Gmbh Verfahren zur Beeinflussung eines Bahnmaterials, wie Papier, und Kalander zur Durchführung des Verfahrens

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4026774A1 (de) * 1990-08-24 1992-03-05 Voith Gmbh J M Mehrwalzen-glaettwerk
DE19508350C1 (de) * 1995-03-09 1996-04-04 Voith Sulzer Finishing Gmbh Kalander zur Bearbeitung von Papier und Pappe mit einem Walzenstapel
WO1998050628A1 (fr) * 1997-05-07 1998-11-12 Valmet Corporation Procede et disposition permettant de calculer et de reguler la distribution de charge lineaire dans une calandre a multiples pinces et calandre a multiples pinces

Also Published As

Publication number Publication date
DE50207705D1 (de) 2006-09-14
DE10158910B4 (de) 2005-12-22
DE10158910A1 (de) 2003-06-18
EP1318237A3 (fr) 2005-02-02
EP1318237B1 (fr) 2006-08-02

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