EP0780513A2 - Process for making a fibrous web and apparatus for carrying out the process - Google Patents
Process for making a fibrous web and apparatus for carrying out the process Download PDFInfo
- Publication number
- EP0780513A2 EP0780513A2 EP96117462A EP96117462A EP0780513A2 EP 0780513 A2 EP0780513 A2 EP 0780513A2 EP 96117462 A EP96117462 A EP 96117462A EP 96117462 A EP96117462 A EP 96117462A EP 0780513 A2 EP0780513 A2 EP 0780513A2
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- European Patent Office
- Prior art keywords
- web
- drying
- inf
- dryer
- press
- Prior art date
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/04—Drying on cylinders on two or more drying cylinders
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/02—Mechanical driving arrangements
Definitions
- the invention relates to a method for producing a fibrous web, e.g. Paper web, especially in a paper making machine.
- the invention also relates to an apparatus for performing this method.
- the starting point of the invention is a known method or a known device according to DE 42 18 595 A1; in particular, reference is made to FIG. 3.
- a still wet paper web - for further water removal - is led through at least one press nip of a press section, from where it reaches a drying section.
- the dryer section includes - at least in its initial area - some dryer groups felted at the top by the web.
- the aforementioned Figure 3 shows, without being explained in more detail, that the number of cylinders increases from dryer group to dryer group.
- the invention is based on the object of further developing the known paper production method described at the outset in accordance with the requirements of different types of paper in such a way that the above-mentioned requirements can be met in the best possible way.
- the invention is based on the knowledge that for the optimal treatment of a still wet web in the press section and in the first dryer groups of the dryer section it is important to take into account the so-called initial wet strength (INF).
- the INF is a value for the strength of the still wet paper web. Among other things, this depends on the level of ash (filler content). The higher the ash content, the lower the wet strength, the more difficult it is to handle a still wet paper web in the paper making machine.
- the lower the INF the greater the number of drying groups that should be as small as possible at the beginning of the drying section, a small drying group being understood to mean one that has relatively few drying cylinders.
- the very first dryer group may only comprise a single cylinder.
- the drawing shows a paper production machine which is suitable for carrying out the method according to the invention in a schematic side view.
- web tension is proportional to the basis weight. The same applies to the relationship between web tension and machine speed.
- the main sections of the paper machine are a headbox S, a twin wire former F, a press section P and a dryer section T.
- the various other sections, such as. B. smoothing unit and / or optionally a coating machine and a retractor are omitted in the drawing.
- the units essential for the method according to the invention are at least one long-nip press (two long-nip presses 11, 12 are provided in the present example) and two or three relatively short drying groups 21, 22, 23 in the initial region of the drying section.
- each of the subsequent dryer groups 24, 25 can have a relatively large number of cylinders (e.g. five to eight cylinders).
- One or preferably two two-felt dry groups 25 can follow some of the felted single-felt dry groups 21-24.
- the first dryer group 21 has two cylinders and the second dryer group 22 has three cylinders. It is indicated schematically that each press and each dryer section 21-25 has its own drive in a known manner.
- the drives are connected to a speed control device 30 via a line system.
- any speed differences can be set in a known manner between successive units. It is important for the method according to the invention that these speed differences can be set to relatively small values, so that the still wet web is carefully stretched in the web running direction at each separation point by a small amount.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
Die Erfindung betrifft ein Verfahren zum Herstellen einer Faserstoffbahn, z.B. Papierbahn, insbesondere in einer Papierherstellungsmaschine und außerdem eine Vorrichtung zum Durchführen dieses Verfahrens. Ausgehend von der DE 42 18 595 soll ein stabiler Lauf der Papierbahn insbesondere bei hohen Geschwindigkeiten gewährleistet und die Gefahr von Bahnabrissen verringert werden. Erreicht wird dies dadurch, daß man die Anzahl der - für das Erzielen eines mittleren Bahn-Trockengehaltes (z.B. 60 %) notwendigen - individuell antreibbaren Aggregate (z.B. Trockengruppen) abhängig macht von der sogenannten Initialen Naßfestigkeit (INF), derart daß man bei einer relativ geringen INF eine größere Anzahl von individuell antreibbaren Aggregaten vorsieht als bei einer relativ hohen INF. <IMAGE>The invention relates to a method for producing a fibrous web, e.g. Paper web, in particular in a paper manufacturing machine and also a device for performing this method. Starting from DE 42 18 595, a stable running of the paper web is to be ensured, in particular at high speeds, and the risk of web breaks is reduced. This is achieved by making the number of individually drivable aggregates (e.g. drying groups) necessary to achieve an average web dry content (e.g. 60%) dependent on the so-called initial wet strength (INF), so that a relative low INF provides a larger number of individually drivable units than a relatively high INF. <IMAGE>
Description
Die Erfindung betrifft ein Verfahren zum Herstellen einer Faserstoffbahn, z.B. Papierbahn, insbesondere in einer Papierherstellungsmaschine. Die Erfindung betrifft außerdem eine Vorrichtung zum Durchführen dieses Verfahrens.The invention relates to a method for producing a fibrous web, e.g. Paper web, especially in a paper making machine. The invention also relates to an apparatus for performing this method.
Ausgangspunkt der Erfindung ist ein bekanntes Verfahren bzw. eine bekannte Vorrichtung gemäß DE 42 18 595 A1; insbesondere auf die Figur 3 wird hingewiesen. Darin wird eine noch nasse Papierbahn - zwecks weiteren Wasserentzugs - durch wenigstens einen Preßspalt einer Pressenpartie geführt, von wo sie in eine Trockenpartie gelangt. Die Trockenpartie umfaßt - zumindest in ihrem Anfangsbereich - einige von der Bahn nacheinander durchlaufene oben befilzte Trockengruppen. Die genannte Figur 3 zeigt, ohne daß dies näher erläutert wird, daß die Zylinder-Anzahl von Trockengruppe zu Trockengruppe ansteigt.The starting point of the invention is a known method or a known device according to DE 42 18 595 A1; in particular, reference is made to FIG. 3. In it, a still wet paper web - for further water removal - is led through at least one press nip of a press section, from where it reaches a drying section. The dryer section includes - at least in its initial area - some dryer groups felted at the top by the web. The aforementioned Figure 3 shows, without being explained in more detail, that the number of cylinders increases from dryer group to dryer group.
Aus der genannten Schrift ist auch bekannt, daß man die Antriebe der aufeinanderfolgenden Aggregate (nämlich der letzten Presse und der nachfolgenden Trockengruppen) auf geringfügige Geschwindigkeits-Differenzen einstellt. Man will hierdurch erreichen, daß die noch feuchte Bahn bei jedem Übergang von einem Aggregat auf das nachfolgende Aggregat in Bahnlaufrichtung gespannt wird, um hierdurch einen möglichst stabilen Lauf der Bahn durch die Papiermaschine zu erreichen.From the cited document it is also known that the drives of the successive units (namely the last press and the subsequent dryer groups) are set to slight speed differences. This is intended to ensure that the web, which is still wet, is tensioned in the web running direction at each transition from one aggregate to the next aggregate, in order thereby to ensure that the web runs as stable as possible through the paper machine.
In dieser Hinsicht sollen jedoch weitere Verbesserungen erzielt werden; denn moderne Papierherstellungsmaschinen sollen mit immer noch weiter gesteigerten Arbeitsgeschwindigkeiten betrieben werden. Zugleich soll der sogenannte Laufwirkungsgrad erhöht werden durch Verringern der Gefahr von Papierbahn-Abrissen. Schließlich werden von den Papierverbrauchern weiterhin zunehmende Anforderungen an die Qualität des fertigen Papiers gestellt.In this regard, however, further improvements are to be achieved; because modern papermaking machines are to be operated at ever increasing working speeds. At the same time, the so-called running efficiency should be increased by reducing the risk of paper web tears. Finally, paper consumers continue to place increasing demands on the quality of the finished paper.
Der Erfindung liegt die Aufgabe zugrunde, das eingangs beschriebene bekannte Papierherstellungsverfahren entsprechend den Anforderungen unterschiedlicher Papiersorten dahingehend weiter zu entwickeln, daß die oben erwähnten Forderungen bestmöglich erfüllt werden können.The invention is based on the object of further developing the known paper production method described at the outset in accordance with the requirements of different types of paper in such a way that the above-mentioned requirements can be met in the best possible way.
Die Erfindung beruht auf der Erkenntnis, daß es zur optimalen Behandlung einer noch feuchten Bahn in der Pressenpartie und in den ersten Trockengruppen der Trockenpartie darauf ankommt, die sogenannte Initiale Naßfestigkeit (INF) zu berücksichtigen.The invention is based on the knowledge that for the optimal treatment of a still wet web in the press section and in the first dryer groups of the dryer section it is important to take into account the so-called initial wet strength (INF).
Die INF ist ein Wert für die Festigkeit der noch nassen Papierbahn. Diese hängt unter anderem ab von der Höhe des Aschegehaltes (Füllstoffanteils). Je höher der Aschegehalt ist, um so geringer ist die Naßfestigkeit, um so schwieriger also ist die Handhabung einer noch nassen Papierbahn in der Papierherstellungsmaschine.The INF is a value for the strength of the still wet paper web. Among other things, this depends on the level of ash (filler content). The higher the ash content, the lower the wet strength, the more difficult it is to handle a still wet paper web in the paper making machine.
Im einzelnen wurde folgendes erkannt: Je niedriger die INF ist, desto größer sollte am Anfang der Trockenpartie die Anzahl möglichst kleiner Trockengruppen sein, wobei unter einer kleinen Trockengruppe eine solche verstanden wird, die relativ wenige Trockenzylinder aufweist. Außerdem kann es vorteilhaft sein, zusätzlich den Trockengehalt der Papierbahn beim Einlaufen in die Trockenpartie dahingehend zu berücksichtigen, daß man bei einem niedrigen Einlauftrockengehalt in der Tendenz ebenfalls möglichst kleine und viele Trockengruppen am Anfang der Trockenpartie vorsieht.The following was recognized in detail: the lower the INF, the greater the number of drying groups that should be as small as possible at the beginning of the drying section, a small drying group being understood to mean one that has relatively few drying cylinders. In addition, it may be advantageous to also take into account the dry content of the paper web when it enters the dryer section in such a way that, with a low inlet dry content, the tendency is also to provide the smallest possible number of dryer groups at the beginning of the dryer section.
Im Extremfall, also wenn eine niedrige INF und ein niedriger Einlauftrockengehalt zusammentreffen, werden gemäß der Erfindung in den ersten ein bis drei Trockengruppen je Trockengruppen nur zwei oder drei Zylinder vorgesehen. Eventuell kann die allererste Trockengruppe nur einen einzigen Zylinder umfassen.In an extreme case, that is, when a low INF and a low inlet dry matter content, according to the invention, only two or three cylinders are provided in the first one to three dryer groups per dryer group. The very first dryer group may only comprise a single cylinder.
Vorteilhaft kann es sein, die Anzahl der Zylinder von Trockengruppe zu Trockengruppe (wie an sich bekannt) vorzugsweise um einen Trockenzylinder zu erhöhen.It can be advantageous to increase the number of cylinders from dryer group to dryer group (as known per se), preferably by one dryer cylinder.
Wesentlich ist, daß man - wie bei dem bekannten Verfahren - die Antriebe der letzten Presse und der ersten Trockengruppen derart auf geringfügige Geschwindigkeits-Differenzen einstellt, daß die noch nasse Bahn an jeder Trennstelle ein wenig in Bahnlaufrichtung gespannt wird. Gemäß der Erfindung erfolgt dieses Spannen öfters als bisher und in kleineren Schritten.It is essential that - as in the known method - the drives of the last press and the first dryer groups are set to slight speed differences in such a way that the still wet web is stretched a little in the web running direction at each separation point. According to the invention, this clamping takes place more often than before and in smaller steps.
Dank dieser kleinen Schritte ist es möglich, daß man die noch feuchte Bahn im wesentlichen ohne freien Bahnzug über sämtliche Trennstellen führt, also nicht nur (wie aus DE '595 bekannt) über die Trennstellen innerhalb der Trockenpartie, sondern insbesondere auch (mittels Saugleitwalze 13) über die Trennstelle zwischen der letzten Presse und der ersten Trockengruppe, gegebenenfalls auch über die Trennstelle zwischen zwei Pressen innerhalb der Pressenpartie. Dadurch wird die Bahn schonender als bisher durch die Papiermaschine geführt, so daß die Gefahr von Bahnabrissen wesentlich verringert ist.Thanks to these small steps, it is possible for the still moist web to be guided over all the dividing points essentially without a free web draw, that is not only (as known from DE '595) over the dividing points within the dryer section, but in particular also (by means of a suction guide roller 13) via the separation point between the last press and the first dryer group, if necessary also via the separation point between two presses within the press section. As a result, the web is guided more gently than before through the paper machine, so that the risk of web breaks is significantly reduced.
Zu einer schonenden Bahnführung kann in einem erheblichen Maße auch noch dadurch beigetragen werden, daß man wenigstens eine der Preßstellen, vorzugsweise alle Preßstellen der Pressenpartie, als Langspalt-Pressen ausbildet. Dies wird am besten dadurch realisiert, daß man Schuhpressen verwendet.To a gentle web guidance can also be contributed to a considerable extent by forming at least one of the press points, preferably all press points of the press section, as long-gap presses. The best way to do this is to use shoe presses.
Beispielhaft ist in der Zeichnung eine Papierherstellungsmaschine, die zum Durchführen des erfindungsgemäßen Verfahrens geeignet ist, in einer schematischen Seitenansicht dargestellt.As an example, the drawing shows a paper production machine which is suitable for carrying out the method according to the invention in a schematic side view.
Zusätzlich sei hiermit erwähnt, daß bei konstanter Maschinengeschwindigkeit und steigenden Aschegehalt die Dehnung des Papiers stark zunimmt.In addition, it should be mentioned that with constant machine speed and increasing ash content, the elongation of the paper increases significantly.
Um dieser Erscheinung Rechnung zu tragen, ist es deshalb notwendig, eine möglichst angepaßte Trockengruppenaufteilung mit den entsprechenden Differenzgeschwindigkeiten zu wählen.In order to take this phenomenon into account, it is therefore necessary to choose a dry group division that is as adapted as possible with the corresponding differential speeds.
Diese Notwendigkeit ergibt sich in zunehmenden Maße mit steigender Maschinengeschwindigkeit.This need arises increasingly with increasing machine speed.
Des weiteren soll in diesem Zusammenhang ebenfall aufgezeigt werden, daß bei konstantem Trockengehalt sich Bahnspannung zu Flächengewicht proportional verhalten. Das gleiche gilt für das Verhältnis Bahnspannung zu Maschinengeschwindigkeit.Furthermore, it should also be shown in this context that with constant dry content, web tension is proportional to the basis weight. The same applies to the relationship between web tension and machine speed.
Für die Anzahl der kurzen Trockengruppen am Anfang der Trockenpartie ist es dabei von Vorteil, wenn diese in Abhängigkeit vom Trockengehalt bei einer Initialen Naßfestigkeit (INF) von weniger als 60 - 65 kN/m 3 kurze Trockengruppen, bei einem INF von weniger als 75 - 85 kN/m 2 kurze Trockengruppen und darüberhinaus nur eine kurze Trockengruppe am Anfang besitzt.For the number of short dryer groups at the beginning of the dryer section, it is advantageous if, depending on the dry content, an initial wet strength (INF) of less than 60 - 65 kN / m 3 short dryer groups, with an INF of less than 75 - 85 kN / m 2 short drying groups and moreover only a short drying group at the beginning.
Die Hauptsektionen der Papiermaschine sind ein Stoffauflauf S, ein Doppelsiebformer F, eine Pressenpartie P und ein Trockenpartie T. Die verschiedenen weiteren Sektionen, wie z. B. Glättwerk und/oder gegebenenfalls eine Streichmaschine sowie ein Aufrollapparat, sind in der Zeichnung weggelassen.The main sections of the paper machine are a headbox S, a twin wire former F, a press section P and a dryer section T. The various other sections, such as. B. smoothing unit and / or optionally a coating machine and a retractor are omitted in the drawing.
Die für das erfindungsgemäße Verfahren wesentlichen Aggregate sind wenigstens eine Langspaltpresse (im vorliegenden Beispiel sind zwei Langspaltpressen 11, 12 vorgesehen) und im Anfangsbereich der Trockenpartie zwei oder drei relativ kurze Trockengruppen 21, 22, 23.The units essential for the method according to the invention are at least one long-nip press (two long-
Wenn die Papierbahn in der Trockenpartie einen bestimmten Trockengehalt (z.B. 60 %) erreicht hat, dann kann jede der nachfolgenden Trockengruppen 24, 25 eine relativ große Anzahl von Zylindern (z.B. fünf bis acht Zylinder) aufweisen. Dabei können sich an einige obenbefilzte Einfilztrockengruppen 21 - 24 eine oder vorzugsweise zwei Zweifilztrockengruppen 25 anschließen.When the paper web in the dryer section has reached a certain dry content (e.g. 60%), each of the
Bei dem hier dargestellten Beispiel hat die erste Trockengruppe 21 zwei Zylinder und die zweite Trockengruppe 22 drei Zylinder. Schematisch angedeutet ist, daß jede Presse und jede Trockengruppe 21 - 25 in bekannter Weise ihren eigenen Antrieb aufweist. Die Antriebe sind über ein Leitungsystem mit einer Geschwindigkeits-Steuereinrichtung 30 verbunden. Mit deren Hilfe kann man in bekannter Weise zwischen aufeinanderfolgenden Aggregaten beliebige Geschwindigkeits-Differenzen einstellen. Für das erfindungsgemäße Verfahren ist es wichtig, daß diese Geschwindigkeits-Differenzen auf relativ kleine Werte einstellbar sind, so daß die noch feuchte Bahn an jeder Trennstelle vorsichtig um einen kleinen Betrag in Bahnlaufrichtung gespannt wird.In the example shown here, the
Claims (8)
bei dem man die aus einer Faserstoff-Suspension geformte aber noch nasse Bahn - zwecks weiteren Wasserentzugs - durch mehrere individuell antreibbare Aggregate führt (insbesondere durch eine Pressenpartie und durch mehrere Trockengruppen),
wobei man die Antriebe der aufeinanderfolgenden Aggregate derart auf geringfügige Geschwindigkeits-Differenzen einstellt, daß die noch nasse oder feuchte Bahn bei jedem Übergang von einem Aggregat auf das nachfolgende Aggregat in Bahnlaufrichtung gespannt wird,
dadurch gekennzeichnet, daß man die Anzahl der - für das Erzielen eines mittleren Bahn-Trockengehaltes (z.B. 60 %) notwendigen - individuell antreibbaren Aggregate (z.B. Trockengruppen) abhängig macht von der sogenannten Initialen Naßfestigkeit (INF),
derart daß man bei einer relativ geringen INF eine größere Anzahl von individuell antreibbaren Aggregaten vorsieht als bei einer relativ hohen INF.Method for producing a fibrous web, for example paper web, in particular in a paper manufacturing machine,
in which the still wet web formed from a fibrous suspension is passed through several individually drivable units (in particular through a press section and through several drying groups) for the purpose of further water removal,
wherein the drives of the successive units are set to slight speed differences in such a way that the still wet or wet web is tensioned in the web running direction with each transition from one unit to the following unit,
characterized in that the number of the individually drivable aggregates (e.g. drying groups) necessary for achieving an average web dry content (e.g. 60%) is made dependent on the so-called initial wet strength (INF),
such that a larger number of individually drivable units are provided with a relatively low INF than with a relatively high INF.
das heißt, die Bahn wird stets, also auch beim Überwechseln von einem zum nachfolgenden Aggregat, mittels einer laufenden Oberfläche (Walzenmantel, Zylindermantel, Filz oder Sieb) geführt (weitgehend schon bekannt).Method according to claim 1, characterized in that the still wet web is led from each of the aggregates to the downstream aggregate essentially without free web tension (e.g. by means of suction roll 13);
This means that the web is always guided (also largely when it is changed from one to the next unit) by means of a running surface (roller jacket, cylinder jacket, felt or screen).
dadurch gekennzeichnet, daß die erste Trockengruppe höchstens vier Trockenzylinder aufweist, wie bekannt.Apparatus for carrying out the method according to one of claims 1 to 3, wherein the individually drivable units comprise at least one wet press and several dryer groups felted above,
characterized in that the first drying group has at most four drying cylinders, as is known.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19548294A DE19548294C1 (en) | 1995-12-22 | 1995-12-22 | Paper-making machine |
| DE19548294 | 1995-12-22 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0780513A2 true EP0780513A2 (en) | 1997-06-25 |
| EP0780513A3 EP0780513A3 (en) | 1998-05-13 |
| EP0780513B1 EP0780513B1 (en) | 2002-01-16 |
Family
ID=7781121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96117462A Expired - Lifetime EP0780513B1 (en) | 1995-12-22 | 1996-10-31 | Process for making a fibrous web |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US6024836A (en) |
| EP (1) | EP0780513B1 (en) |
| DE (2) | DE19548294C1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8382948B2 (en) | 2008-06-24 | 2013-02-26 | Basf Se | Production of paper |
| US10626558B2 (en) | 2015-08-06 | 2020-04-21 | Solenis Technologies, L.P. | Method for producing paper |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI104100B1 (en) * | 1998-06-10 | 1999-11-15 | Valmet Corp | Integrated paper machine |
| DE19848630A1 (en) * | 1998-10-22 | 2000-04-27 | Voith Sulzer Papiertech Patent | Paper web drying station, has support belt with specific dimensions, suction rollers and drying cylinders |
| DE19934777A1 (en) * | 1999-07-23 | 2001-01-25 | Voith Paper Patent Gmbh | Dryer section producing or finishing paper, card or tissue web includes detachment region without support, which is provided further away by drying sieve |
| FI121081B (en) * | 2002-01-08 | 2010-06-30 | Metso Paper Automation Oy | Method and equipment associated with a paper machine or paper finishing device |
| JP3691031B2 (en) * | 2002-07-19 | 2005-08-31 | 三菱重工業株式会社 | Paper machine control method |
| FI122145B (en) * | 2009-12-31 | 2011-09-15 | Upm Kymmene Corp | Process and system for manufacturing a fibrous product |
| PL2723943T3 (en) | 2011-06-21 | 2019-01-31 | Basf Se | Method for producing paper, paperboard, and cardboard |
| US8753479B2 (en) | 2011-06-21 | 2014-06-17 | Basf Se | Production of paper, card and board |
| US9051687B2 (en) | 2012-08-22 | 2015-06-09 | Basf Se | Production of paper, card and board |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4218595A1 (en) | 1992-06-05 | 1993-12-09 | Voith Gmbh J M | Machine for the production of a fibrous web |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2091805A (en) * | 1934-10-06 | 1937-08-31 | Harry A Chuse | Paper making method and machine |
| GB993603A (en) * | 1962-11-15 | 1965-06-02 | Billeruds Ab | Method of producing extensible paper |
| US3257734A (en) * | 1965-09-29 | 1966-06-28 | Cons Paper Bahamas Ltd | Method for controlling tension in supported sheet material |
| US4359828A (en) * | 1979-11-05 | 1982-11-23 | Weyerhaeuser Company | Vacuum box for use in high speed papermaking |
| US5542193A (en) * | 1992-04-24 | 1996-08-06 | Beloit Technologies, Inc. | Dryer group for curl control |
| US5638611A (en) * | 1995-10-18 | 1997-06-17 | Voith Sulzer Papiermaschinen Gmbh | Single-tier drying section tailored for compensating stretching and shrinking of paper web |
-
1995
- 1995-12-22 DE DE19548294A patent/DE19548294C1/en not_active Expired - Fee Related
-
1996
- 1996-10-31 DE DE59608595T patent/DE59608595D1/en not_active Expired - Fee Related
- 1996-10-31 EP EP96117462A patent/EP0780513B1/en not_active Expired - Lifetime
- 1996-12-20 US US08/772,092 patent/US6024836A/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4218595A1 (en) | 1992-06-05 | 1993-12-09 | Voith Gmbh J M | Machine for the production of a fibrous web |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8382948B2 (en) | 2008-06-24 | 2013-02-26 | Basf Se | Production of paper |
| US10626558B2 (en) | 2015-08-06 | 2020-04-21 | Solenis Technologies, L.P. | Method for producing paper |
Also Published As
| Publication number | Publication date |
|---|---|
| US6024836A (en) | 2000-02-15 |
| EP0780513B1 (en) | 2002-01-16 |
| EP0780513A3 (en) | 1998-05-13 |
| DE59608595D1 (en) | 2002-02-21 |
| DE19548294C1 (en) | 1997-04-03 |
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