EP1314818A1 - Vorrichtung und Verfahren zum Glätten einer Papier- oder Kartonbahn - Google Patents
Vorrichtung und Verfahren zum Glätten einer Papier- oder Kartonbahn Download PDFInfo
- Publication number
- EP1314818A1 EP1314818A1 EP02024064A EP02024064A EP1314818A1 EP 1314818 A1 EP1314818 A1 EP 1314818A1 EP 02024064 A EP02024064 A EP 02024064A EP 02024064 A EP02024064 A EP 02024064A EP 1314818 A1 EP1314818 A1 EP 1314818A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- web
- roller
- nip
- wide nip
- smooth
- 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
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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
- D21G1/0073—Accessories for calenders
- D21G1/0093—Web conditioning devices
-
- 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
- D21G1/006—Calenders; Smoothing apparatus with extended nips
Definitions
- the invention relates to a device for smoothing a Paper or cardboard web with a first section, in which a first side of the web is on a hot belt and the opposite second side on a cold one Tape is applied, and with a second section. Further The invention relates to a method for smoothing a Paper or cardboard web, in which the web between one heated first band on their first side and one refrigerated second band over on its second side a predetermined route is performed.
- Such a device and such a method are known from EP 0 478 525 B1.
- the device will also known as "Condebelt". With the Condebelt is it is possible to dry a paper or cardboard web and at the same time the one lying on the heated belt Smooth side. Drying is achieved that one on the opposite of the heated belt Side by cooling the there Band a condensation effect and thus a lowering of the partial pressure of the steam, so that the Moisture in the web from hot to hot cold side wanders. As a side effect a smoothing of the surface of the side of the web that is on the heated belt.
- the invention has for its object a web smooth on both sides.
- This task is the beginning of a device mentioned type in that in the second section a wide nip is arranged in which a smooth hard roller and a circumferential coat that with help a support shoe rests on the roller, form a nip, through which the web runs, the second side abuts the roller.
- the second Side of the web due to the steam leak in the first Section has increased roughness, smoothed becomes. It takes advantage of the fact that Web with the second side for a relatively long time lies against the smooth hard roller, so that sufficient Time is available to smooth the surface hard roller to transfer to the second side of the web.
- the wide nip has a much longer length (seen in the direction of travel of the web) on as a nip that is formed between two opposing rollers. Accordingly, there is not only a longer dwell time and thus a longer press time is available, but the compressive stress in the wide nip can be compared the compressive stress in a formed between two rollers Nip be greatly reduced.
- the coat can be different Be trained types.
- One possibility is the use of a relatively stiff coat that is elastic is enough to adapt to the curvature of the roller, but practically revolves like a roller.
- This jacket can be provided with washers on the front his.
- Another option is to use it of a less stiff band, which is supported by support rollers is circulated, the pulleys practical define a polygon.
- Such a tape can also be relatively thin.
- the roller is preferably heated. When the roller is heated then it has an improved smoothing effect to the second side of the web. Heating the Roller is a relatively simple measure to get the smoothness values to improve.
- the roller preferably has a surface temperature of at least 95 ° C. At that temperature is of it assume that the fibers on the surface of the To a certain extent. by virtue of the relatively long duration of exposure to the web in The temperatures don't have to be Breitnip either be too high. If you stay below 100 ° C, you get no steam that leaks out of the surface Breitnip could "tear open” again.
- the support shoe preferably has a concave curvature on, which is adapted to the curvature of the roller.
- the curvature of the support shoe follows the Curvature of the roller at a predetermined distance, wherein the distance is determined by the thickness of the jacket is. This creates a relatively even pressurization of the web in the Breitnip.
- the mean compressive stress in the nip is preferably in the range from 0.1 to 3 N / mm 2 . In this compressive stress range, there is no need to fear significant compression of the web, i.e. the decrease in bulk. Nevertheless, the compressive stress is sufficient to achieve the desired smoothness on the second side of the web.
- the jacket is preferably made impermeable to steam.
- the roller is also not permeable to steam. This configuration has the advantage that when Smooth the second side of the web no deterioration the surface properties of the first page of the Web must accept through escaping steam. The Rather, if it arises at all, steam becomes in the Track held.
- a steam application device in front of the nip is located on the side of the web that abuts the roller.
- the Smoothing in the wide nip further improved, which in particular on the rougher side of the web to a significant Quality increase leads.
- the invention is in a method of the aforementioned Art solved in that the web after Passing through the tapes through a wide nip by a hard, smooth roller and a coat is formed over a predetermined peripheral portion abuts the roller, the second Side of the web lies against the roller.
- the roller then serves the second side of the Smooth the web.
- the smoothing is done by a relatively long stay of the train in the nip, in the the surface of the smooth, hard roller on the surface the second side of the web.
- the roller is preferably heated.
- the heating is a relatively simple measure to smooth out the Improve roller.
- the web in the wide nip is preferably subjected to a compressive stress in the range from 0.1 to 3 N / mm 2 .
- This compressive stress range ensures that the web is not overly compressed.
- the compressive stress allows the surface of the hard, smooth roller to be imprinted on the surface of the web.
- the roller is left with a predetermined one Rotate slip opposite the web. This also bears help smooth the track. Due to the slip there is a relative movement between the roller and the Web that leads to a "polishing" of the web.
- the effective length of the wide nip is preferably chosen so that the web has a dwell time of at least 1.5 ms in the wide nip. This time is considered sufficient viewed to adequately cover the second side of the web smooth.
- the residence time is preferably in the range from 1.5 to 15 ms.
- the train before entering the wide nip on the side that lies against the roller is moistened, especially with steam. If the rougher Side of the web before laying on the smooth roller is moistened and preferably heated, is the smoothness increase even bigger due to the hard roller.
- a device 1 for smoothing a paper or cardboard web 2 shows a first one Section 3 in which the web 2 between two bands 4, 5 is performed.
- the web 2 lies with a first side 6 on the upper band 4 and with a second side 7 on the lower band 5.
- Band 4 is guided over two guide rollers 8, 9.
- the lower run of the upper band 4 is from a heater 10 heated.
- the lower band 5 is guided over pulleys 11-14. It is in the area between the pulleys 11, 12 upper strand of a support band 15 supported and by a cooling device 16 cooled.
- the support band 15 and the tape 5 are permeable to moisture.
- the band 5 as a felt band and the support band 15 as Screen belt formed.
- the upper band 4 is designed, for example, as a metal band, i.e. it has a relatively smooth surface on the surface of the first page 6 of the Memories lane 2.
- the surface of the second side 7 is after leaving of the first section 3, however, extraordinary rough, because here on the one hand the surface of the tape 5, for example made of felt, in the surface of the Has embossed lane 2. Second is through the second Page 7 the steam escaped, causing a further increase which contributes to roughness.
- a second section 17 is provided in which a wide nip press 18 is arranged.
- the Breitnippresse 18 has a roller 19 which is smooth, hard and heated Roll is formed.
- a heater is not shown in detail. The heating can be on many different types occur, for example with a hot liquid, such as water or oil, with steam, electrically or by heat radiation.
- the roller 19 With the roller 19 cooperates a jacket 20, the is pressed against the roller by a support shoe 21 and forms a wide nip 22 with the roller. Between the support shoe 21 and the jacket 20 is hydraulic Support provided that a lubrication and Generated sliding film.
- the nip has a width, i.e. one Length in the running direction of web 2, of the order of magnitude from about 70 to about 250 mm.
- the coat 20 is about only schematically shown idlers 23-25 out.
- the Support shoe 21 has a convex pressure surface 26, whose curvature is adapted to the curvature of the roller 19.
- the roller 19 has a surface temperature of at least 95 ° C. It can be done at a speed Be driven slightly by the speed the material web 2 differs so that a slip between the web 2 and the circumference of the roller 19 arises.
- Lane 2 is already comparatively dry. It has a moisture content of at most 12%. A compressive stress in the range from 0.1 to 3 N / mm 2 prevails in the nip 22. In this way it is possible for the surface of the hard, smooth roller 19 to be embossed into the surface of the second side 7 of the web 2 without the web 2 being more densely compacted. The bulk remains practically unchanged. Nevertheless, after passing through the nip 22, a web 2 is obtained, the two sides 6, 7 of which are relatively smooth.
- the width of the nip 22 depends, among other things the desired smoothing result. Depending on the The speed of the web 2 becomes the width of the nip 22 chosen so that the path in nip 22 has a dwell time in Has a range of 1.5 to 15 ms.
- a steam application device 27 is arranged in front of the nip 22, on the rougher side of lane 2. This side is moistened and heated by the steam, so that the hard, smooth roller 19 is even more effective can smooth.
Landscapes
- Paper (AREA)
Abstract
Description
- einzige Fig.
- eine schematische Darstellung einer Vorrichtung zum Glätten einer Papier- oder Kartonbahn
Claims (14)
- Vorrichtung zum Glätten einer Papier- oder Kartonbahn mit einem ersten Abschnitt, in dem eine erste Seite der Bahn an einem heißen Band und die gegenüberliegende zweite Seite an einem kalten Band anliegt, und mit einem zweiten Abschnitt, dadurch gekennzeichnet, daß im zweiten Abschnitt (17) eine Breitnippresse (18) angeordnet ist, in der eine glatte, harte Walze. (19) und ein umlaufender Mantel (20), der mit Hilfe eines Stützschuhs (21) an der Walze (19) anliegt, einen Nip (22) bilden, durch den die Bahn (2) läuft, wobei die zweite Seite (7) an der Walze anliegt.
- Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Walze (19) beheizt ist.
- Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Walze (19) eine Oberflächentemperatur von mindestens 95°C aufweist.
- Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Stützschuh (21) eine konkave Krümmung (26) aufweist, die an die Krümmung der Walze (19) angepaßt ist.
- Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die mittlere Druckspannung im Nip (22) im Bereich von 0,1 bis 3 N/mm2 liegt.
- Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Mantel dampfundurchlässig ausgebildet ist.
- Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß vor dem Nip (22) eine Dampfauftragseinrichtung (27) auf der Seite der Bahn (2) angeordnet ist, die an der Walze (19) anliegt.
- Verfahren zum Glätten einer Papier- oder Kartonbahn, bei dem die Bahn zwischen einem beheizten ersten Band an ihrer ersten Seite und einem gekühlten zweiten Band an ihrer zweiten Seite über eine vorbestimmte Strecke geführt wird, dadurch gekennzeichnet, daß die Bahn danach durch einen Breitnip geführt wird, der durch eine harte, glatte Walze und einen Mantel gebildet wird, der über einen vorbestimmten Umfangsabschnitt an der Walze anliegt, wobei die zweite Seite der Bahn an der Walze anliegt.
- Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß man die Walze beheizt.
- Verfahren nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß man die Feuchtigkeit der Bahn auf höchstens 12% vor dem Einlaufen in den Breitnip einstellt.
- Verfahren nach einem der Ansprüche 8 bis 10, dadurch gekennzeichnet, daß man die Bahn im Breitnip mit einer Druckspannung im Bereich von 0,1 bis 3 N/mm2 beaufschlagt.
- Verfahren nach einem der Ansprüche 8 bis 11, dadurch gekennzeichnet, daß man die Walze mit einem vorbestimmten Schlupf gegenüber der Bahn rotieren läßt.
- Verfahren nach einem der Ansprüche 8 bis 12, dadurch gekennzeichnet, daß man die wirksame Länge des Breitnips so wählt, daß die Bahn eine Verweilzeit von mindestens 1,5 ms im Breitnip aufweist.
- Verfahren nach einem der Ansprüche 8 bis 13, dadurch gekennzeichnet, daß die Bahn vor dem Eintritt in den Breitnip auf der Seite, die an der Walze anliegt, befeuchtet wird, insbesondere mit Dampf.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10157723 | 2001-11-24 | ||
DE10157723A DE10157723B4 (de) | 2001-11-24 | 2001-11-24 | Vorrichtung und Verfahren zum Glätten einer Papier- oder Kartonbahn |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1314818A1 true EP1314818A1 (de) | 2003-05-28 |
EP1314818B1 EP1314818B1 (de) | 2005-04-27 |
Family
ID=7706871
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02024064A Expired - Lifetime EP1314818B1 (de) | 2001-11-24 | 2002-10-29 | Vorrichtung und Verfahren zum Glätten einer Papier- oder Kartonbahn |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1314818B1 (de) |
DE (2) | DE10157723B4 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1785524A1 (de) * | 2005-11-12 | 2007-05-16 | Voith Patent GmbH | Anordnung zum Glätten einer Faserstoffbahn |
US8480858B2 (en) * | 2007-12-20 | 2013-07-09 | Stora Enso Oyj | Board or paper produced in an arrangement in connection with the press section of a web-forming machine |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009045416A1 (de) * | 2009-10-07 | 2011-04-14 | Voith Patent Gmbh | Pressanordnung |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0478525A2 (de) * | 1990-09-20 | 1992-04-01 | Oy Keskuslaboratorio - Centrallaboratorium Ab | Verfahren und Vorrichtung zum Glätten einer Papier- oder Pappebahn |
US5163364A (en) * | 1988-10-31 | 1992-11-17 | Sulzer-Escher Wyss Gmbh | Method for calendering a paper or cardboard web |
WO2001059211A1 (en) * | 2000-02-11 | 2001-08-16 | Metso Paper, Inc. | Method and device changing the vapour pressure inside the paper web in calendering |
WO2001083883A1 (en) * | 2000-04-18 | 2001-11-08 | Metso Paper, Inc. | Method for calendering a board web |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5524532A (en) * | 1994-12-28 | 1996-06-11 | Valmet Corporation | Method and apparatus for calendering a paper or board web |
-
2001
- 2001-11-24 DE DE10157723A patent/DE10157723B4/de not_active Expired - Fee Related
-
2002
- 2002-10-29 DE DE50202893T patent/DE50202893D1/de not_active Expired - Fee Related
- 2002-10-29 EP EP02024064A patent/EP1314818B1/de not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5163364A (en) * | 1988-10-31 | 1992-11-17 | Sulzer-Escher Wyss Gmbh | Method for calendering a paper or cardboard web |
EP0478525A2 (de) * | 1990-09-20 | 1992-04-01 | Oy Keskuslaboratorio - Centrallaboratorium Ab | Verfahren und Vorrichtung zum Glätten einer Papier- oder Pappebahn |
WO2001059211A1 (en) * | 2000-02-11 | 2001-08-16 | Metso Paper, Inc. | Method and device changing the vapour pressure inside the paper web in calendering |
WO2001083883A1 (en) * | 2000-04-18 | 2001-11-08 | Metso Paper, Inc. | Method for calendering a board web |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1785524A1 (de) * | 2005-11-12 | 2007-05-16 | Voith Patent GmbH | Anordnung zum Glätten einer Faserstoffbahn |
US8480858B2 (en) * | 2007-12-20 | 2013-07-09 | Stora Enso Oyj | Board or paper produced in an arrangement in connection with the press section of a web-forming machine |
Also Published As
Publication number | Publication date |
---|---|
EP1314818B1 (de) | 2005-04-27 |
DE50202893D1 (de) | 2005-06-02 |
DE10157723B4 (de) | 2005-12-22 |
DE10157723A1 (de) | 2003-06-12 |
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