EP1318233A2 - Verfahren und Vorrichtung zum Behandeln einer Faserstoffbahn - Google Patents
Verfahren und Vorrichtung zum Behandeln einer Faserstoffbahn Download PDFInfo
- Publication number
- EP1318233A2 EP1318233A2 EP02024217A EP02024217A EP1318233A2 EP 1318233 A2 EP1318233 A2 EP 1318233A2 EP 02024217 A EP02024217 A EP 02024217A EP 02024217 A EP02024217 A EP 02024217A EP 1318233 A2 EP1318233 A2 EP 1318233A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- web
- medium
- water
- roller
- 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
Links
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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
- D21G1/0073—Accessories for calenders
- D21G1/0093—Web conditioning devices
Definitions
- the invention relates to a method for treating a Fibrous web, in particular a paper or Cardboard web, where you heat the web in a wide nip, by a roller and a surrounding jacket or by two jackets running over support elements is formed over a predetermined peripheral portion To have contact with each other. Furthermore, the Invention an apparatus for treating a fibrous web, especially a paper or cardboard web, with a wide nip that is passed through a roller and over a predetermined peripheral portion against the roller pressed coat or by two over support elements running coats is formed, and with a heater, that acts on the web in wide nip.
- Such a method and device are known from EP 0 370 185 B2.
- the Breitnip has the advantage that the web has one lingers longer than this in a nip between two rollers would be the case.
- the compressive stress is compared to such a nip comparatively low. Due to the higher temperature and accordingly smooth contact surfaces can therefore be the web in one Smooth the Breitnip in a way that is gentle on the volume.
- the invention has for its object the smoothing result to improve in a wide nip and more moisture to keep on the train.
- This task is carried out in a method of the type mentioned at the beginning Art solved in that the web before Breitnip is charged with a medium that is faster than that when entering the wide nip fiber water in the fibers and in the fiber structure evaporates.
- the medium which is also referred to as "inert medium” is referred to, along with the web and the moisture contained in the web as it passes through of the broad nip warmed. If the train now the Breitnip leaves, then the inert medium evaporates and forms thus a barrier to the steam that is in the train is included. One will exit the Cannot completely prevent steam from the train. To maintain the smooth surface and moisture But keeping it on the train is enough if the steam is slow, i.e. at a low speed and accordingly with a low one kinetic energy can emerge from the web.
- the Inert medium is otherwise not included is relative after leaving the wide nip quickly be far enough away that the steam in the railway no longer opposes a major blocking effect. To at this point the web has cooled down that the steam either condenses again in the web is or it has such a low vapor pressure that he does no more damage.
- the Medium can change its state, e.g. of liquid to gaseous. Chemical reactions with a Change in the molecular structure however not instead.
- the inert medium that is used during the run of the broad nip evaporates. So the inert medium penetrates not deeper into the web, but at most wets a small part of the web in the area of the surface, so that the evaporation of the inert medium does not has the same harmful consequences as the sudden one Steam escapes from the web.
- the Inert medium therefore evaporates earlier than the fiber water and thus forms a "protective shield" through which the Water vapor cannot escape.
- the inert medium evaporates faster than the fiber water.
- the smaller enthalpy of the inert medium prevents temperatures from arising which also leads to a strong evaporation of the fiber water to lead.
- a liquid inert medium is preferably chosen.
- a liquid inert medium is easy to apply and adheres to the surface of the web.
- the surface tension of the water can be different Belittling way. For example to add salts and thus a kind from the water Make electrolyte. Detergents can be added to the water or bases or acids. In many cases but it is sufficient to use water with a higher temperature than the temperature of the fibrous web before the wide nip to use. For example, if the fibrous web arrives at a temperature of around 60 ° C, water which is given at a temperature of 95 ° C, evaporate faster than the fiber water contained in the web.
- the inert medium can be suctioned off, condensed and applied again be returned to the web.
- the object is achieved in a device of the type mentioned Art solved in that before the Breitnip a Medium application device is arranged, which is a medium on the web that is faster than that when entering the wide nip in the fibers and in the fiber structure fiber water can evaporate.
- the inert medium is a neutral medium that differs from the moisture trapped in the web.
- Applying the inert medium to the web causes that the inert medium with the web still wet through the wide nip.
- Both Inert medium as well as the web with the one in it Moisture warms up.
- After leaving the Breitnips then evaporates the inert medium and thereby the exit of the steam that comes out of the in the Prevents moisture.
- the smoothness of the web created in the wide nip has been preserved.
- there will be more Fiber water kept in the web so that the moisture can be better maintained.
- the medium preferably has a lower enthalpy of vaporization as water on. So it evaporates at a lower temperature than the water and forms good protection early on.
- the medium preferably has a higher vapor pressure as water on. This is a sufficiently high one Pressure available to retain steam in the web. If the evaporation of the inert medium If the web cools sufficiently, the steam in the web can condense again.
- the application device as Liquid application device is formed. If the inert medium can be applied as a liquid evaporate when leaving the wide nip. When evaporating the web is cooled so that the Condensation of moisture in the web can be done faster can.
- the application device preferably acts on both sides on the train. This will release steam on both Reliably avoided sides of the web.
- the jacket and the surface of the Roller impermeable to the medium. Coat and roller then act in the broad nip as a lock on the inert medium, so that the inert medium continues to the end of the wide nip the web is held.
- a device 1 for treating a fibrous web 2 (hereinafter referred to as "web"), ie a paper or Cardboard web, has a roller 3, which with a schematic heater 4 is provided.
- the heater can be in different ways the roller 3 act, for example from the outside with steam, hot air, IR radiation or electrical or magnetic Fields, or it can be a heat transfer medium, for example water, oil, steam or the like, in feed the roller in.
- the heater 4 provides for the fact that the roller 3 at least on its surface has an elevated temperature.
- a jacket 5 acts from one compliant material made with the help of a support shoe 6 is pressed against the roller 3.
- the coat 5 is so resilient that he is in the area between Adjust support shoe 6 and roller 3 to the curvature of roller 3 can.
- Rolls 7 are shown schematically guide the jacket 5 in the manner of a roller.
- the support shoe 6 has a pressure surface 8 which the curvature of the roller 3 is adapted and not in more detail illustrated manner with a suitable lubrication device, for example hydrostatic support, is provided. In this way it is possible that the jacket 5 performed low friction over the support shoe 6 becomes.
- a suitable lubrication device for example hydrostatic support
- the jacket 5 and the roller 3 together form one Breitnip 9, i.e. a nip that is over a predetermined Circumferential region of the roller 3 extends. by virtue of this length, the web 2 in the Breitnip 9 has a significant longer dwell time than in a nip passing through two opposing rollers is formed. With otherwise the same contact pressure, the compressive stress is in the Breitnip 9, of course, much lower because here a larger press area is available. Accordingly it is possible to use the web 2 in the Breitnip 9 with a relatively high temperature but with a low one Smooth surface pressure, taking the smoothing effect mainly due to the smooth surface of the roller 3 is caused.
- the Breitnip 9 has due to the longer dwell time the web 2 but also the effect that the web 2 is not only heated on its surface, but in Basically completely at an elevated temperature brought. This temperature increase can be so great be that moisture that may still be in the web is evaporated. The moisture is there all formed by water that is in the fibers or located in the fiber structure. This is especially true for Paper or cardboard webs. This water is called here "Fiber water” called. The moisture should anyway to a certain extent kept on the train to process the web later can, for example by printing. If the web 2 then leaves the Breitnip 9 at the exit 10, there is Danger that the steam in Breitnip 9 still through the Roller 3 and the jacket 5 held in the web 2 has emerged from web 2.
- the medium is in the present embodiment due to liquid nitrogen, alcohols, Ester or water formed, the water being a higher Temperature than the incoming web or a reduced surface tension.
- the reduced surface tension can for example by the addition of salts, detergents, alkalis or acids be achieved so that the water evaporate more easily can.
- the medium is also called "inert medium” referred to because it's basically just mechanical should ensure that the moisture in the Web remains intact or in any case emerge more slowly can.
- the inert medium should flow through do not change chemically through the wide nip, i.e. the molecular structure of its components is not supposed to change.
- the inert medium has a lower enthalpy of vaporization on than that contained in lane 2 Fiber water. This leads to the fact that when going through the Breitnips first evaporates the inert medium. When evaporating thermal energy is required for the inert medium. Evaporation may even do so under certain circumstances cause the web 2 itself to cool somewhat so that the steam that forms in the web 2 has, can even condense again.
- the application device 12 has an upper application nozzle 13 and a lower application nozzle 14 through which the inert medium over the entire width of the web 2 evenly on the top and bottom surfaces of the Lane 2, i.e. the surface that bears against the roller 3, or the surface that lies against the jacket 5, is sprayed on.
- the inert medium is from a Pump 15 supplied, the inert medium from a reservoir 16, for example a tank.
- the exit 10 of the wide nip 9 are both Inert medium as well as the moisture in the web as steam before.
- the vapor of the inert medium lies thereby on the web and thereby prevents the Steam from the moisture inside the web to the outside can leak. If the inert medium is a lower one Evaporation enthalpy and / or a higher vapor pressure than water, then the exit of Steam from web 2 prevented quickly and effectively.
- the inert medium, or the vapor of the inert medium is already a relatively short distance behind the Exit 10 of the broad nip 9 from the surface of the web to have disappeared. At this time, however, the lane is 2 cooled so far that the moisture is already back is condensed in it. At least the steam is cooled so far that its exit velocity become so small due to the surfaces of the web 2 is that destruction of these surfaces no longer can take place.
- the application device 12 can be so short or dense arrange before the wide nip that the inert medium practical has no time to get on the train before the web enters the Breitnip 9.
- the application nozzles 13, 14 have a beveled shape so that they in the Gusset between the web 2 and the roller 3 or the Sheath 5 can be used without the movement to hinder the roller 3 and the jacket 5.
- This movement is identified by arrows 17, 18.
- the Lane 2 runs in the direction of an arrow 19.
- the inert medium can also be applied by an application roller or applied by a squeegee, creating a Film of the inert medium is formed on the web 2.
- a recovery device be with which the vaporized inert medium into one Cycle can be performed.
- the recovery device sucks off the evaporated inert medium, condenses it and leads it back to the application device 12 to. This is particularly the case with more expensive inert media from Advantage.
Landscapes
- Paper (AREA)
Abstract
Description
- flüssigen Stickstoff,
- Alkohol,
- Ester,
- Wasser mit reduzierter Oberflächenspannung,
- Wasser mit höherer Temperatur als die Faserstoffbahn vor dem Breitnip.
- flüssigem Stickstoff,
- Alkohol,
- Ester,
- Wasser mit reduzierter Oberflächenspannung,
- Wasser mit höherer Temperatur als die Faserstoffbahn vor dem Breitnip.
- einzige Fig.
- eine schematische Darstellung einer Vorrichtung zum Behandeln einer Faserstoffbahn.
Claims (17)
- Verfahren zum Behandeln einer Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn, bei dem man die Bahn in einem Breitnip erwärmt, der durch eine Walze und einen umlaufenden Mantel oder durch zwei über Stützelemente laufende Mäntel gebildet ist, die über einen vorbestimmten Umfangsabschnitt Kontakt miteinander haben, dadurch gekennzeichnet, daß man die Bahn vor dem Breitnip mit einem Medium beaufschlagt, das sich schneller als das sich beim Eintreten in den Breitnip in den Fasern und im Fasergerüst befindende Faserwasser verdampfen läßt.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man ein Medium wählt, bei dem sich die molekulare Struktur der Komponenten des Mediums beim Durchlauf durch den Breitnip nicht ändert.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß man ein Medium wählt, das beim Durchlaufen des Breitnips verdampft.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß man ein Medium wählt, das eine niedrigere Verdampfungsenthalpie als das Faserwasser aufweist.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß man ein Medium wählt, das einen höheren Dampfdruck als das Faserwasser aufweist.
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß man ein flüssiges Medium wählt.
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß man als Medium einen oder mehrere der folgenden Stoffe wählt:flüssigen Stickstoff,Alkohol,Ester,Wasser mit reduzierter Oberflächenspannung,Wasser mit höherer Temperatur als die Faserstoffbahn vor dem Breitnip.
- Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß man das verdampfte Medium nach dem Breitnip wieder zurückgewinnt.
- Vorrichtung zum Behandeln einer Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn, mit einem Breitnip, der durch eine Walze und einen über einen vorbestimmten Umfangsabschnitt gegen die Walze gedrückten Mantel oder durch zwei über Stützelemente laufende Mäntel gebildet ist, und mit einer Heizeinrichtung, die im Breitnip auf die Bahn wirkt, dadurch gekennzeichnet, daß vor dem Breitnip (9) eine Medium-Auftragseinrichtung (12) angeordnet ist, die ein Medium auf die Bahn aufträgt, das sich schneller als das sich beim Eintreten in den Breitnip in den Fasern und im Fasergerüst befindende Faserwasser verdampfen läßt.
- Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, daß die Auftragseinrichtung (12) kurz vor dem Breitnip (9) angeordnet ist.
- Vorrichtung nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß das Medium eine niedrigere Verdampfungsenthalpie als Wasser aufweist.
- Vorrichtung nach einem der Ansprüche 9 bis 11, dadurch gekennzeichnet, daß das Medium einen höheren Dampfdruck als Wasser aufweist.
- Vorrichtung nach einem der Ansprüche 9 bis 12, dadurch gekennzeichnet, daß die Auftragseinrichtung (12) als Flüssigkeits-Auftragseinrichtung ausgebildet ist.
- Vorrichtung nach Anspruch 13, dadurch gekennzeichnet, daß die Auftragseinrichtung als Sprüheinrichtung (13, 14) oder als Filmauftragseinrichtung ausgebildet ist.
- Vorrichtung nach einem der Ansprüche 9 bis 14, dadurch gekennzeichnet, daß die Auftragseinrichtung (12) beidseitig auf die Bahn (2) wirkt.
- Vorrichtung nach einem der Ansprüche 9 bis 15, dadurch gekennzeichnet, daß der Mantel (5) und die Oberfläche der Walze (3) für das Medium undurchlässig sind.
- Vorrichtung nach einem der Ansprüche 8 bis 16, dadurch gekennzeichnet, daß das Medium gebildet ist aus einem oder mehreren der folgenden Stoffe:flüssigem Stickstoff,Alkohol,Ester,Wasser mit reduzierter Oberflächenspannung,Wasser mit höherer Temperatur als die Faserstoffbahn vor dem Breitnip.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2001157689 DE10157689C1 (de) | 2001-11-24 | 2001-11-24 | Verfahren und Vorrichtung zum Behandeln einer Faserstoffbahn |
DE10157689 | 2001-11-24 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1318233A2 true EP1318233A2 (de) | 2003-06-11 |
EP1318233A3 EP1318233A3 (de) | 2003-09-10 |
EP1318233B1 EP1318233B1 (de) | 2006-08-16 |
Family
ID=7706843
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20020024217 Expired - Lifetime EP1318233B1 (de) | 2001-11-24 | 2002-10-31 | Verfahren und Vorrichtung zum Behandeln einer Faserstoffbahn |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1318233B1 (de) |
DE (2) | DE10157689C1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005022466A1 (de) * | 2005-05-14 | 2006-11-16 | Voith Patent Gmbh | Verfahren und Vorrichtung zum Befeuchten einer Materialbahn |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0617165A1 (de) * | 1993-03-08 | 1994-09-28 | Valmet Paper Machinery Inc. | Verfahren zum Kalandern einer Papierbahn und ein Kalander zur Durchführung des Verfahrens |
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 |
---|---|---|---|---|
DE3920204A1 (de) * | 1988-10-31 | 1990-05-10 | Escher Wyss Gmbh | Verfahren zum glaetten einer papier- oder kartonbahn |
-
2001
- 2001-11-24 DE DE2001157689 patent/DE10157689C1/de not_active Expired - Fee Related
-
2002
- 2002-10-31 DE DE50207845T patent/DE50207845D1/de not_active Expired - Fee Related
- 2002-10-31 EP EP20020024217 patent/EP1318233B1/de not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0617165A1 (de) * | 1993-03-08 | 1994-09-28 | Valmet Paper Machinery Inc. | Verfahren zum Kalandern einer Papierbahn und ein Kalander zur Durchführung des Verfahrens |
WO2001083883A1 (en) * | 2000-04-18 | 2001-11-08 | Metso Paper, Inc. | Method for calendering a board web |
Also Published As
Publication number | Publication date |
---|---|
EP1318233A3 (de) | 2003-09-10 |
DE50207845D1 (de) | 2006-09-28 |
EP1318233B1 (de) | 2006-08-16 |
DE10157689C1 (de) | 2003-02-13 |
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