EP0945546B1 - Kalander zur Behandlung einer Papierbahn - Google Patents
Kalander zur Behandlung einer Papierbahn Download PDFInfo
- Publication number
- EP0945546B1 EP0945546B1 EP99105649A EP99105649A EP0945546B1 EP 0945546 B1 EP0945546 B1 EP 0945546B1 EP 99105649 A EP99105649 A EP 99105649A EP 99105649 A EP99105649 A EP 99105649A EP 0945546 B1 EP0945546 B1 EP 0945546B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- calender
- surface layer
- calender according
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- 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 calender for Treatment of a paper web with a roll stack at least three rollers and with at least one double soft nip, by two rollers with an elastic surface is formed, in which fibers of the paper web can impress locally.
- Such a calender is for example from EP 0 748 895 A2 known.
- Calenders of this type have been used in papermaking mainly two tasks. For one thing, they have to Compact the paper web. On the other hand, they should determine Generate surface properties, for example a the highest possible gloss and the highest possible smoothness.
- the calender known from EP 0 748 895 A2 has here alternately in a roll stack of 6 to 12 rolls a "hard” and a “soft” roller.
- the hard ones Rollers are heated. You have a very smooth Surface. They are usually available as steel or cast rolls educated. The smooth surface of the hard Rolling "stamps" itself on the surface of the paper web and convey the desired smoothness and, together with the heat generated by the heating, the desired shine.
- the "soft” rollers have an elastic one Surface and mainly serve for compaction the paper web. Because their surface is elastic trained, that is, to give in to a certain degree can result in crushing of the fibers avoided the paper web.
- the invention is based, the possibility of action to improve the web.
- This task is performed on a calender of the type mentioned at the beginning Art solved in that at least one of the Double soft nip forming rollers is heated.
- the through the two rollers with elastic surface, i.e. the two soft rollers, limited nip is given an additional function.
- this nip can namely because of the elevated temperature Energy are entered into the material web so that at least one further compression is possible. by virtue of this additional function is no longer a simple exchange gap.
- This nip is therefore referred to here as a "double soft nip". Due to the increased temperature, the Nip, which is formed by two rollers and on would be lost for processing the material web, can be used for editing. In extreme cases With such a configuration, one of the omit the remaining nips so that under certain circumstances can reduce the height of the calender. This saves costs considerably.
- the calender preferably has at least two double soft nips and each double soft nip has at least a heated roller. So you can see the beneficial ones Effects of such a double soft nip in Use calenders several times, as long as at least one the soft rollers that form the double soft nips are heated is.
- the surface preferably has at least one Double soft nip forming roller a smooth surface whose average roughness Ra under operating conditions does not exceed 0.5 ⁇ m.
- One of those smooth surface can also be combined with an elastic surface, for example in the manner described in DE 195 06 301 A1 is. This way you can see the web of material not only compress in the double soft nip, but also at least smooth on the side that is on the soft Roller with the smooth surface. Even better the results, if even both, of the double soft nip forming rollers have a smooth surface. In this case you can in the double soft nip or compress the material web and on both sides smooth out what may be saving further Nips in the calender makes possible. The two-sidedness of the material web can be quite considerable be reduced.
- the rollers with the elastic Surface a hard core and a surface layer made of an elastic material. This simplifies it the construction.
- the hard core supports that elastic surface layer. By choosing the thickness some parameters of the surface layer Affect double soft nips.
- the elastic material has a predetermined good thermal conductivity.
- a thermal conductivity can be achieved by improve a number of measures, for example due to the storage of good heat-conducting material. But you can also use a material that is in itself has a predetermined good conductivity for heat. In this case, a higher temperature, which is generated, for example, inside the roller will penetrate to the surface with few losses. It is of course also possible to directly touch the surface to be heated from the outside.
- the surface layer is very is thin.
- a correspondingly thin layer sets this Heat transport from the inside out accordingly low resistance to so that you can on the surface the surface layer very quickly the required Maintains temperatures with low losses.
- a thin surface layer has more Benefits. It enables fibers of the material web, especially with a paper web that is local protrude, press into the elastic surface.
- the roller has a very thin surface layer almost the characteristic of a "hard” Roller, i.e. a surface shape results during operation the roller, which is at least approximately the surface shape corresponds to a hard roller.
- the surface layer a thickness below 4 mm, especially in the area from 0.02 to 2 mm.
- the surface layer is advantageous due to a Plastic formed. Plastics are big Variety available so that you can meet the requirements can choose a suitable plastic. The thinner the layer is, the lower the elastic modulus his.
- the surface layer is advantageous as a lacquer layer educated. So you can go for the roller with elastic Surface layer use a "hard” roller, i.e. a roller core made of steel or cast iron that is painted becomes. Double soft nips formed with such rollers are producing excellent results even if the heating is not carried out or only to a small extent.
- the Thickness for example, is 120 microns.
- Such Chrome layer is very smooth or can be made very smooth become.
- a roller coated in this way can be used a double soft nip can be used without the Material web is damaged. Tests have shown that their use along with a hard roller despite the elastic surface layer under the coating a black satin and to make the paper web greasy leads. Instead of a chrome layer you can also other metals, ceramic materials or plastics use.
- At least all of the center rollers preferably have one elastic surface.
- the calender then refrains from the inlet and outlet gap, only double soft nips on.
- the smooth Surfaces of the elastic rollers can be excellent results with just a few double soft nips achieve so that you can get by with just a few rollers.
- one the top roller and the bottom roller of the calender with one elastic surface In this case can even form all nips as double soft nips his.
- center rolls are preferably of the same design. You can no longer differentiate between hard ones and soft rollers, making inventory quite considerable facilitated. Of course, the center rollers can show certain differences, for example in In terms of diameter. But they are among each other interchangeable.
- a calender 1 has a roll stack of several Rollers, here six rollers. It acts in detail a top roller 2 in the top position and a Lower roller 3 at the lowest position. Top roller 2 and bottom roller 3 can be designed as deflection adjustment rollers be what by pressure shoes 4, 5, for example can work hydrostatically is indicated. There are four between the upper roller 2 and the lower roller 3 Middle rollers 6-9 arranged. The middle rollers have 6-9 an essentially similar structure. You differentiate at most in diameter.
- Each center roll 6-9 has a surface layer 10 on, which surrounds a core 11.
- the core 11 is hard i.e. it is made of steel or cast iron or a comparable one Material formed.
- the surface layer 10 is formed from a plastic that is elastic.
- the Surface layer 10 is shown exaggeratedly thick, to illustrate it. Its thickness is in reality less than 4 mm. As a rule, their thickness lies in the range of 0.02 to 2 mm, i.e. it can also be used as Paint layer should be formed.
- the material that forms layer 10 has a predetermined one good thermal conductivity, so that heat are supplied via heating channels 12 in the core 11, relatively can quickly penetrate the surface of the roller.
- the Advancement of temperature is also mentioned by the small thickness relieved.
- the second center roll 7 points from the top of the layer 10 an additional coating 13 made of metal, ceramic or plastic on.
- This coating can be even smoother be made as the surface of layer 10. However should only have one roller with one per nip such a coating may be present.
- the remaining three nips 19-21 are always limited by two rollers 6-9, which is an elastic Have surface. they therefore form double soft nips 19-21. Each double soft nip 19-21 is heated.
- 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. In general, it can even be kept at 0.1 ⁇ m or less. Due to the small thickness of the layer 10, the middle rollers 6-9 almost have the operating behavior of a hard roller, wherein fibers of the paper web can press locally into the surface due to the elastic surface formed by the layer 10. In other respects, however, the rollers 6-9 practically have the same behavior as their core 11 with regard to the elasticity.
- the layer 10 can in this case be formed from a material which has an elastic modulus of 4,000 N / mm 2 or less.
- the thickness of the layer 10 can, for example, be chosen so that it is smaller than the distance of the maximum shear stress from the outer surface of the layer 10.
- the center rollers can be constructed as described in the subsequently published German patent application 197 10 573, to which Reference is made.
Landscapes
- Paper (AREA)
Description
- die einzige Figur
- einen Kalander.
Claims (12)
- Kalander zur Behandlung einer Papierbahn mit einem Walzenstapel aus mindestens drei Walzen und mit mindestens einem Doppelweichnip, der durch zwei Walzen mit elastischer Oberfläche gebildet ist, in die sich Fasern der Papierbahn lokal eindrücken können, dadurch gekennzeichnet, daß mindestens eine der den Doppelweichnip (19-21) bildenden Walzen (6-9) beheizbar ist.
- Kalander nach Anspruch 1, dadurch gekennzeichnet, daß er mindestens zwei Doppelweichnips (19-21) aufweist und jeder Doppelweichnip (19-21) mindestens eine beheizbare Walze (6-9) aufweist.
- Kalander nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Oberfläche mindestens einer einen Doppelweichnip (19-21) bildenden Walze (6-9) eine glatte Oberfläche (22) aufweist, deren mittlere Rauhigkeit Ra unter Betriebsbedingungen den Wert 0,5 µm nicht übersteigt.
- Kalander nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Walzen (6-9) mit der elastischen Oberfläche (22) einen harten Kern (11) und eine Oberflächenschicht (10) aus einem elastischen Material aufweisen.
- Kalander nach Anspruch 4, dadurch gekennzeichnet, daß das elastische Material eine vorbestimmte gute Wärmeleitfähigkeit aufweist.
- Kalander nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Oberflächenschicht (10) sehr dünn ist.
- Kalander nach Anspruch 6, dadurch gekennzeichnet, daß die Oberflächenschicht (10) eine Dicke unter 4 mm, insbesondere im Bereich von 0,02 bis 2 mm aufweist.
- Kalander nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, daß die Oberflächenschicht (10) durch einen Kunststoff gebildet ist.
- Kalander nach einem der Ansprüche 4 bis 8, dadurch gekennzeichnet, daß die Oberflächenschicht (10) als Lackschicht ausgebildet ist.
- Kalander nach einem der Ansprüche 4 bis 9, dadurch gekennzeichnet, daß eine der einen Doppelweichnip (19-21) bildenden Walzen (7) auf der Oberflächenschicht (10) einen Überzug (13) aus Metall, Keramik oder Kunststoff aufweist.
- Kalander nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß zumindest alle Mittelwalzen (6-9) eine elastische Oberfläche aufweisen.
- Kalander nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß alle Mittelwalzen (6-9) gleichartig ausgebildet sind.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19813640A DE19813640A1 (de) | 1998-03-27 | 1998-03-27 | Kalander, insbesondere zur Behandlung einer Papierbahn |
DE19813640 | 1998-03-27 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0945546A2 EP0945546A2 (de) | 1999-09-29 |
EP0945546A3 EP0945546A3 (de) | 2000-02-23 |
EP0945546B1 true EP0945546B1 (de) | 2002-11-06 |
Family
ID=7862609
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99105649A Expired - Lifetime EP0945546B1 (de) | 1998-03-27 | 1999-03-19 | Kalander zur Behandlung einer Papierbahn |
Country Status (5)
Country | Link |
---|---|
US (1) | US6230615B1 (de) |
EP (1) | EP0945546B1 (de) |
AT (1) | ATE227374T1 (de) |
CA (1) | CA2267030C (de) |
DE (2) | DE19813640A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6786144B2 (en) * | 2001-05-30 | 2004-09-07 | New Gencoat, Inc. | Wringer roller system |
DE10221172A1 (de) * | 2002-05-13 | 2003-12-04 | Voith Paper Patent Gmbh | Elastische Glättwalze und Verfahren zur Herstellung einer solchen |
FI121275B (fi) * | 2007-04-12 | 2010-09-15 | Metso Paper Inc | Menetelmä kuiturainan kalanteroimiseksi |
DE102008044369A1 (de) | 2008-12-05 | 2010-06-10 | Voith Patent Gmbh | Kalander |
DE102009045824A1 (de) * | 2009-10-20 | 2011-04-21 | Voith Patent Gmbh | Kalander |
DE102009046918A1 (de) * | 2009-11-20 | 2011-05-26 | Voith Patent Gmbh | Mehrwalzenkalander und Umbauverfahren eines Mehrwalzenkalanders |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3401439A (en) * | 1965-05-19 | 1968-09-17 | Gen Binding Corp | Laminating apparatus |
DE3937246C2 (de) | 1988-11-11 | 2002-06-27 | Metso Paper Inc | Kalandrierverfahren |
DE4026774A1 (de) * | 1990-08-24 | 1992-03-05 | Voith Gmbh J M | Mehrwalzen-glaettwerk |
DE19506301C2 (de) | 1995-02-23 | 2000-07-13 | Voith Sulzer Finishing Gmbh | Kalander für Papierbahnen |
DE19521402C2 (de) | 1995-06-13 | 2002-02-07 | Voith Paper Gmbh | Kalander für die Behandlung einer Papierbahn |
DE29518424U1 (de) * | 1995-11-21 | 1996-03-14 | Voith Sulzer Finishing GmbH, 47803 Krefeld | Kalander in einer Papier- oder Streichmaschine |
DE19547164C1 (de) * | 1995-12-16 | 1997-02-06 | Voith Sulzer Finishing Gmbh | Kalander für die Behandlung einer Papierbahn und Anwendung dieses Kalanders |
FI107625B (fi) * | 1996-04-29 | 2001-09-14 | Metso Paper Inc | Menetelmä paperirainan kalanteroinnissa ja menetelmää soveltava kalanteri |
DE19710573C2 (de) | 1997-03-14 | 1999-01-21 | Voith Sulzer Finishing Gmbh | Kalander, insbesondere für Papierbahnen |
-
1998
- 1998-03-27 DE DE19813640A patent/DE19813640A1/de not_active Withdrawn
-
1999
- 1999-03-19 AT AT99105649T patent/ATE227374T1/de active
- 1999-03-19 DE DE59903283T patent/DE59903283D1/de not_active Expired - Lifetime
- 1999-03-19 EP EP99105649A patent/EP0945546B1/de not_active Expired - Lifetime
- 1999-03-26 CA CA002267030A patent/CA2267030C/en not_active Expired - Fee Related
- 1999-03-26 US US09/277,195 patent/US6230615B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE59903283D1 (de) | 2002-12-12 |
ATE227374T1 (de) | 2002-11-15 |
US6230615B1 (en) | 2001-05-15 |
DE19813640A1 (de) | 1999-09-30 |
CA2267030A1 (en) | 1999-09-27 |
CA2267030C (en) | 2004-01-27 |
EP0945546A3 (de) | 2000-02-23 |
EP0945546A2 (de) | 1999-09-29 |
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