EP1020559B1 - Device for drying and smoothing fibrous webs - Google Patents
Device for drying and smoothing fibrous webs Download PDFInfo
- Publication number
- EP1020559B1 EP1020559B1 EP99123079A EP99123079A EP1020559B1 EP 1020559 B1 EP1020559 B1 EP 1020559B1 EP 99123079 A EP99123079 A EP 99123079A EP 99123079 A EP99123079 A EP 99123079A EP 1020559 B1 EP1020559 B1 EP 1020559B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fibrous web
- moisture
- drying
- drying section
- smoothing
- 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
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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
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- 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
- D21F7/003—Indicating or regulating the moisture content of the layer
-
- 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
- D21F7/008—Steam showers
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G7/00—Damping devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S162/00—Paper making and fiber liberation
- Y10S162/06—Moisture and basic weight
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S162/00—Paper making and fiber liberation
- Y10S162/09—Uses for paper making sludge
- Y10S162/10—Computer control of paper making variables
Definitions
- the invention relates to methods and associated apparatus for drying and Smoothing of a fibrous web, in particular a paper web, in a machine for Production and / or refinement thereof, consisting of at least one Drying section, in which the fibrous web is passed over several heated cylinders and a calender with several smoothing nips.
- a machine for Production and / or refinement thereof consisting of at least one Drying section, in which the fibrous web is passed over several heated cylinders and a calender with several smoothing nips.
- Such method or such device is e.g. from EP 0 742 313 A2.
- SC papers achieve 97% - 98% solids content on the End of the dryer section with a good moisture cross profile of 2 sigma of approx. 0.15% to 0.3%.
- By moistening at the end of the dryer section is doing the Dry content reduced to 91% to 93%.
- the paper is fed to a calender.
- the recorded at the end of the dryer section moisture profile is here to control the influencing device at the end of the dryer section and possibly also existing steam blow boxes in one of the dryer section upstream press section used. This is not only inaccurate, but also with long reaction times which increases the reject rate.
- the object of the invention is therefore, method and apparatus for drying and smoothing of fibrous webs such that the calendering the drying process especially at high speeds and at Ensuring the best possible moisture profile directly connected can be.
- the object has been achieved in that respect to the method at least an influence on the moisture distribution over the thickness and / or the transverse moisture profile in the first two-thirds of the dryer section and at least one further influence in the last third of the dryer section and / or between the Drying section and the calender takes place.
- the Fibrous web in the dryer section at most up to a solids content of 93% dried and several times within the dryer section on the moisture profile of the Pulp web influenced and / or the moisture distribution across the thickness the fibrous web during the drying process at several locations on the Moistening or drying of at least one side of the fibrous web as possible evenly formed.
- the dry content of the fibrous web in the dryer section which may preferably be at most 91%, resulting in significant Energy savings.
- a relatively uniform moisture distribution over the thickness of the Fibrous web during the drying process has the advantage that at the end of Drying party with a low moistening or drying manages. As a result, not too strong to achieve a good moisture profile be dried.
- the fibrous web, the dryer section and the Calender at a speed of more than 1200 m / min, preferably more than 1500 m / min duch secured. It is particularly advantageous if the Fiber web heated in the calender and zonewise over the width of the fibrous web controllably pressed and steamed.
- the intensity of moistening or drying should be at least in some places for Influencing the moisture cross-section zonewise across the width of the fibrous web be adjustable.
- the setting of the zones should be based on the Subordinated measurement of the moisture profile cross.
- the zone width should be be as small as possible and less than 50 mm, preferably less than 25 mm.
- the associated device is characterized in that on the one hand the Fibrous web at least in one of the first two-thirds and in the last third of the Drying section and / or in the area between the dryer section and the calender at least one influencing device is assigned and / or on the other hand the Fibrous web at least in an area in which it has a moisture content between 50% and 15%, preferably between 25% and 15% and at least in one Area in which they have a moisture content between 20% and 8%, preferably between 15% and 8% has at least one influencing device assigned is.
- at least two influencing devices are used.
- the Influencing facilities for humidification especially in the last third of Drying section the water with the smallest possible drop size in the range of less than 100 ⁇ m, preferably less than 80 ⁇ m, to the fibrous web.
- the division of the fibrous web length should be between the last Influencing the moisture distribution over the thickness and / or the moisture profile in particular via a moistening and the first smoothing nip of the following Calender divided by the speed of the fibrous web at least one Second. This minimal penetration time allows penetration of the sprayed water into the fibrous web until the beginning of the smoothing process.
- the influencing devices are moisture transverse profile measuring units assigned, which act on the control of the influencing devices.
- one moisture transverse profile measuring unit assigned, preferably to be downstream.
- the moisture distribution over the thickness and width of the fibrous web can be advantageous be influenced by the fact that upstream in one of the dryer section Press section for dewatering the same at least one transverse to the fibrous web Zone-controlled steam box for heating the fibrous web is located.
- the calender consists of at least three smoothing rollers, which in pairs each form a smoothing gap, wherein at least one smoothing roller heated and at least one smoothing roller is designed to be deflection-controlled.
- one Humidification in the calender can improve the result, with heating and / or Humidification (usually with steam) should preferably be controllable zone by zone.
- the fibrous web 1 passes through together with at least a press felt 13 at least one of two press rolls 14 formed press nip.
- the press felt 13 takes the squeezed out water and leads it from the Fiber web 1 away.
- the fiber web 1 passes to the dryer section 2 from the consists of several drying groups in which the fibrous web 1 together with a drying wire 12 alternately over heated cylinder 3 and preferably suctioned guide rollers 11 runs.
- the underside of the fibrous web 1 touches the heated cylinder 3 and the drying wire, the guide rollers 11th
- the fibrous web 1 is a calender 4 for Generation of gloss and smoothness led.
- This calender 4 consists here by way of example of six superimposed Smoothing rolls 10, which form in pairs five smoothing gaps 5, of two adjacent Smoothing rollers 5 one heated and the other is carried out deflection controlled.
- a steam blower box 9 which is transverse to Fiber web 1 is zonewise controllable and affects the moisture profile.
- a moisture transverse profile measuring unit 7 is arranged for this purpose, which acts on the steam blower box 9.
- All influencing devices 6 are zone controlled, the zone width is 25 - 30 mm and the sprayed water droplets are smaller than 100 um, and from downstream Moisture transverse profile measuring units 7 influenced.
- the moisture cross profile measuring unit 7 of the first influencing device 6 before the last two Influencing devices 6 is arranged have the last two Influencing facilities 6 of the dryer section 2 a common, between Drying section 2 and calender 4 existing moisture transverse profile measuring unit 7.
- both sides of the fibrous web 1 at least in the end of the Drying section 2 come into contact with heated cylinders 3.
- both sides of the fibrous web 1 influencing devices 6 may be arranged for humidification.
- the example shown allows speeds of more than 1500 m / min, wherein the influencing means 6 within the dryer section 2 in a range between 40% and 20% moisture content at the beginning of the dryer section 2 and in one Range between 15% and 10% at the end of the dryer section 2 are arranged.
- the fibrous web length is between the last Influencing device 6 for moistening and the first smoothing nip 5 For example, 30 m, which is the sufficient penetration of water in the Fiber web 1 allowed until smoothing.
- the measurement of the moisture profile can, for example, in a known manner with Infrared technology done.
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- Paper (AREA)
Description
Die Erfindung betrifft Verfahren und dazugehörige Vorrichtung zur Trocknung und Glättung einer Faserstoffbahn, insbesondere einer Papierbahn, in einer Maschine zur Herstellung und/oder Veredlung derselben, bestehend aus zumindest einer Trockenpartie, in der die Faserstoffbahn über mehrere beheizte Zylinder geführt wird und einem Kalander mit mehreren Glättspalten. Solches Verfahren bzw. solche Vorrichtung ist z.B. aus EP 0 742 313 A2 bekannt.The invention relates to methods and associated apparatus for drying and Smoothing of a fibrous web, in particular a paper web, in a machine for Production and / or refinement thereof, consisting of at least one Drying section, in which the fibrous web is passed over several heated cylinders and a calender with several smoothing nips. Such method or such device is e.g. from EP 0 742 313 A2.
Um dabei ein möglichst gleichmäßiges Feuchtequerprofil zu erreichen, werden die Faserstoffbahnen bisher sehr stark ausgetrocknet und am Ende des Trocknungsvorganges wieder befeuchtet. Dies erfordert sehr viel Energie und lange Trockenpartien.In order to achieve the most uniform moisture profile possible, the Fibrous webs so far very heavily dried and at the end of Drying again moistened. This requires a lot of energy and a long time Drying sections.
Herkömmliche SC-Papiere erreichen beispielsweise 97% - 98% Trockengehalt am Ende der Trockenpartie bei einem guten Feuchtequerprofil von 2 Sigma von ca. 0,15% bis 0,3%. Durch die Befeuchtung am Ende der Trockenpartie wird dabei der Trockengehalt auf 91% bis 93% gesenkt. Nach einer "Reifezeit" der Papierrolle, in der sich auch ein Ausgleich des Feuchtegehaltes über die Dicke des Papiers hin vollzieht, wird das Papier einem Kalander zugeführt.For example, conventional SC papers achieve 97% - 98% solids content on the End of the dryer section with a good moisture cross profile of 2 sigma of approx. 0.15% to 0.3%. By moistening at the end of the dryer section is doing the Dry content reduced to 91% to 93%. After a "maturity" of the paper roll, in the a balance of moisture content across the thickness of the paper takes place, the paper is fed to a calender.
Zur Effektivierung des Herstellungsprozesses besteht jedoch ein steigendes Interesse, das Kalandrieren unmittelbar an den Trocknungsvorgang anzuschließen. Durch den Wegfall der o. g. "Reifezeit" verschlechtert sich jedoch inbesondere bei hohen Geschwindigkeiten das Feuchtequerprofil der Faserstoffbahn erheblich.However, there is a growing interest in making the manufacturing process more effective. calendering directly to the drying process. By the Omission of the o. G. However, "maturity" deteriorates especially at high Speeds the moisture profile of the fibrous web considerably.
Das am Ende der Trockenpartie erfaßte Feuchtequerprofil wird hierbei zur Steuerung der Beeinflussungseinrichtung am Ende der Trockenpartie und eventuell auch vorhandener Dampfblaskästen in einer der Trockenpartie vorgelagerten Pressenpartie verwendet. Dies ist nicht nur ungenau, sondern auch mit langen Reaktionszeiten verbunden, was die Ausschußquote erhöht.The recorded at the end of the dryer section moisture profile is here to control the influencing device at the end of the dryer section and possibly also existing steam blow boxes in one of the dryer section upstream press section used. This is not only inaccurate, but also with long reaction times which increases the reject rate.
Die Aufgabe der Erfindung ist es daher, Verfahren und Vorrichtung zur Trocknung und Glättung von Faserstoffbahnen derart weiterzuentwickeln, daß das Kalandrieren dem Trocknungsvorgang insbesondere auch bei hohen Geschwindigkeiten sowie bei Gewährleistung eines möglichst guten Feuchtequerprofils unmittelbar angeschlossen werden kann.The object of the invention is therefore, method and apparatus for drying and smoothing of fibrous webs such that the calendering the drying process especially at high speeds and at Ensuring the best possible moisture profile directly connected can be.
Erfindungsgemäß wurde die Aufgabe dadurch gelöst, daß hinsichtlich der Verfahren zumindest eine Beeinflussung der Feuchteverteilung über die Dicke und/oder des Feuchtequerprofils in den ersten beiden Dritteln der Trockenpartie und zumindest eine weitere Beeinflussung im letzten Drittel der Trockenpartie und/oder zwischen der Trockenpartie und dem Kalander erfolgt.According to the invention the object has been achieved in that respect to the method at least an influence on the moisture distribution over the thickness and / or the transverse moisture profile in the first two-thirds of the dryer section and at least one further influence in the last third of the dryer section and / or between the Drying section and the calender takes place.
Vorzugsweise wird dabei die Faserstoffbahn in der Trockenpartie höchstens bis auf einen Trockengehalt von 93% getrocknet und innerhalb der Trockenpartie mehrfach auf das Feuchtequerprofil der Faserstoffbahn Einfluß genommen und/oder die Feuchteverteilung über die Dicke der Faserstoffbahn während des Trocknungsvorganges an mehreren Orten über die Befeuchtung oder Trocknung zumindest einer Seite der Faserstoffbahn möglichst gleichmäßig ausgebildet.Preferably, the Fibrous web in the dryer section at most up to a solids content of 93% dried and several times within the dryer section on the moisture profile of the Pulp web influenced and / or the moisture distribution across the thickness the fibrous web during the drying process at several locations on the Moistening or drying of at least one side of the fibrous web as possible evenly formed.
Durch die Begrenzung des Trockengehaltes der Faserstoffbahn in der Trockenpartie, der vorzugsweise auch höchstens 91% betragen kann, ergeben sich erhebliche Energieeinsparungen.By limiting the dry content of the fibrous web in the dryer section, which may preferably be at most 91%, resulting in significant Energy savings.
Die Gewährleistung eines guten, gleichmäßigen Feuchtequerprofils, quer zur Faserstoffbahn betrachtet, wird über die Beeinflussung desselben an mehreren Orten innerhalb der Trockenpartie erreicht.Ensuring a good, even moisture cross profile, across the Fibrous web is considered influencing the same in several places reached within the dryer section.
Desweiteren hat eine relativ gleichmäßige Feuchteverteilung über die Dicke der Faserstoffbahn während des Trocknungsvorganges den Vorteil, daß man am Ende der Trockenpartie mit einer geringen Befeuchtung oder Trocknung auskommt. Infolgedessen muß auch nicht zum Erreichen eines guten Feuchtequerprofils zu stark getrocknet werden. Furthermore, a relatively uniform moisture distribution over the thickness of the Fibrous web during the drying process has the advantage that at the end of Drying party with a low moistening or drying manages. As a result, not too strong to achieve a good moisture profile be dried.
Es kann von Vorteil sein, wenn zumindest eine Beeinflussung bei einem Feuchtegehalt zwischen 50 % und 15 %, vorzugsweise zwischen 25 % und 15 % und eine weitere Beeinflussung bei einem Feuchtegehalt zwischen 20 % und 8 %, vorzugsweise zwischen 15 % und 8 % realisiert wird.It can be advantageous if at least an influence on a moisture content between 50% and 15%, preferably between 25% and 15% and another Influence at a moisture content between 20% and 8%, preferably between 15% and 8% is realized.
Wegen der guten Feuchteverteilung bzw. dem guten Feuchtequerprofils am Ende der Trockenpartie ist es möglich, daß die Faserstoffbahn die Trockenpartie sowie den Kalander mit einer Geschwindigkeit von mehr als 1200 m/min, vorzugsweise von mehr als 1500 m/min duchläuft. Dabei ist es insbesondere von Vorteil, wenn die Faserstoffbahn im Kalander beheizt und über die Breite der Faserstoffbahn zonenweise steuerbar gepreßt und bedampft wird.Because of the good moisture distribution or the good moisture cross profile at the end of the Drying section, it is possible that the fibrous web, the dryer section and the Calender at a speed of more than 1200 m / min, preferably more than 1500 m / min duchlaufen. It is particularly advantageous if the Fiber web heated in the calender and zonewise over the width of the fibrous web controllably pressed and steamed.
Die Intensität der Befeuchtung oder Trocknung sollte zumindest an einigen Orten zur Beeinflussung des Feuchtequerprofils zonenweise über die Breite der Faserstoffbahn einstellbar sein. Die Einstellung der Zonen sollte jeweils auf der Basis der nachgeordneten Messung des Feuchtequerprofils erfolgen. Die Zonenbreite sollte möglichst klein sein und unter 50 mm, vorzugsweise unter 25 mm liegen.The intensity of moistening or drying should be at least in some places for Influencing the moisture cross-section zonewise across the width of the fibrous web be adjustable. The setting of the zones should be based on the Subordinated measurement of the moisture profile cross. The zone width should be be as small as possible and less than 50 mm, preferably less than 25 mm.
Die dazugehörige Vorrichtung ist dadurch gekennzeichnet, daß einerseits der Faserstoffbahn zumindest in einem der ersten beiden Drittel sowie im letzten Drittel der Trockenpartie und/oder in dem Bereich zwischen der Trockenpartie und dem Kalander wenigstens eine Beeinflussungseinrichtung zugeordnet ist und/oder andererseits der Faserstoffbahn zumindest in einem Bereich, in dem sie einen Feuchtegehalt zwischen 50 % und 15 %, vorzugsweise zwischen 25 % und 15 % sowie zumindest in einem Bereich, in dem sie einen Feuchtegehalt zwischen 20 % und 8 %, vorzugsweise zwischen 15 % und 8 % besitzt, wenigstens eine Beeinflussungseinrichtung zugeordnet ist. Im Ergebnis kommen zumindest zwei Beeinflussungseinrichtungen zum Einsatz.The associated device is characterized in that on the one hand the Fibrous web at least in one of the first two-thirds and in the last third of the Drying section and / or in the area between the dryer section and the calender at least one influencing device is assigned and / or on the other hand the Fibrous web at least in an area in which it has a moisture content between 50% and 15%, preferably between 25% and 15% and at least in one Area in which they have a moisture content between 20% and 8%, preferably between 15% and 8% has at least one influencing device assigned is. As a result, at least two influencing devices are used.
Zur Gewährleistung einer möglichst feinen Wasserverteilung sollten die Beeinflussungseinrichtungen zur Befeuchtung insbesondere im letzten Drittel der Trockenpartie das Wasser mit möglichst geringer Tropfengröße im Bereich von weniger als 100 um vorzugsweise weniger als 80 um zur Faserstoffbahn sprühen.To ensure the finest possible water distribution, the Influencing facilities for humidification, especially in the last third of Drying section the water with the smallest possible drop size in the range of less than 100 μm, preferably less than 80 μm, to the fibrous web.
Außerdem sollte die Division der Faserstoffbahnlänge zwischen der letzten Beeinflussung der Feuchteverteilung über die Dicke und/oder des Feuchtequerprofils insbesondere über eine Befeuchtung und dem ersten Glättspalt des folgenden Kalanders dividiert durch die Geschwindigkeit der Faserstoffbahn mindestens eine Sekunde betragen. Diese minimale Penetrationszeit erlaubt das Eindringen des aufgesprühten Wassers in die Faserstoffbahn bis zum Beginn des Glättvorganges.In addition, the division of the fibrous web length should be between the last Influencing the moisture distribution over the thickness and / or the moisture profile in particular via a moistening and the first smoothing nip of the following Calender divided by the speed of the fibrous web at least one Second. This minimal penetration time allows penetration of the sprayed water into the fibrous web until the beginning of the smoothing process.
Den Beeinflussungseinrichtungen sind dabei Feuchtequerprofil-Meßeinheiten zugeordnet, welche auf die Steuerung der Beeinflussungseinrichtungen einwirken.The influencing devices are moisture transverse profile measuring units assigned, which act on the control of the influencing devices.
Zur Gewährleistung einer kurzen Reaktionszeit bzw. einer optimalen Ausregelung sollte möglichst jeder Beeinflussungseinrichtung jeweils eine Feuchtequerprofil-Meßeinheit zugeordnet, vorzugsweise nachgeordnet sein.To ensure a short reaction time or optimal compensation should as far as possible for each influencing device, in each case one moisture transverse profile measuring unit assigned, preferably to be downstream.
Es ist auch möglich, daß mehrere Feuchtequerprofil-Meßeinheiten vorhanden sind und jeder Feuchtequerprofil-Meßeinheit ein oder zwei Beeinflussungseinrichtungen zugeordnet sind.It is also possible that several moisture transverse profile measuring units available and each moisture cross profile measuring unit one or two Influencing facilities are assigned.
Die Feuchteverteilung über die Dicke und Breite der Faserstoffbahn kann mit Vorteil noch dadurch beeinflußt werden, daß sich in einer der Trockenpartie vorgelagerten Pressenpartie zur Entwässerung derselben zumindest ein quer zur Faserstoffbahn zonenweise steuerbarer Dampfblaskasten zur Erwärmung der Faserstoffbahn befindet. The moisture distribution over the thickness and width of the fibrous web can be advantageous be influenced by the fact that upstream in one of the dryer section Press section for dewatering the same at least one transverse to the fibrous web Zone-controlled steam box for heating the fibrous web is located.
Für das Erreichen guter Werte an Glanz und Glätte der Faserstoffbahn ist es wesentlich, daß der Kalander aus zumindest drei Glättwalzen besteht, welche paarweise jeweils einen Glättspalt bilden, wobei zumindest eine Glättwalze beheizt und zumindest eine Glättwalze durchbiegungsgesteuert ausgeführt ist. Auch eine Befeuchtung im Kalander kann das Ergebnis verbessern, wobei Beheizung und/oder Befeuchtung (meist mit Dampf) vorzugsweise zonenweise steuerbar sein sollten.It is for achieving good gloss and smoothness of the fibrous web essential that the calender consists of at least three smoothing rollers, which in pairs each form a smoothing gap, wherein at least one smoothing roller heated and at least one smoothing roller is designed to be deflection-controlled. Also one Humidification in the calender can improve the result, with heating and / or Humidification (usually with steam) should preferably be controllable zone by zone.
In Trockenpartien, in denen vorwiegend nur eine Seite der Faserstoffbahn mit beheizten Zylindern in Kontakt kommt, ist es im allgemeinen ausreichend, wenn zumindest überwiegend nur dieser Seite der Faserstoffbahn Beeinflussungseinrichtungen vorzugsweise zur Befeuchtung zugeordnet sind. Lediglich im letzten Drittel der Trockenpartie kann es wegen der Trocknung der äußeren Bereiche der Faserstoffbahn notwendig sein, beiden Seiten der Faserstoffbahn zumindest jeweils eine Beeinflussungseinrichtung zuzuordnen.In dryer sections, in which predominantly only one side of the fibrous web with heated Cylinders comes into contact, it is generally sufficient if at least predominantly only this side of the fibrous web influencing devices are preferably assigned for humidification. Only in the last third of the Drying section may be due to the drying of the outer areas of the fibrous web be necessary, both sides of the fibrous web at least one each Assign influencing device.
Falls beide Seiten der Faserstoffbahn in erheblichem Umfang mit beheizten Zylindern in Kontakt kommen, sollten auch beiden Seiten Beeinflussungseinrichtungen zur Befeuchtung zugeordnet sein.If both sides of the fibrous web to a considerable extent with heated cylinders in Contact should also be on both sides influencing facilities Be assigned to humidification.
Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. In der beigefügten Zeichnung zeigt die Figur eine schematische Darstellung einer Pressen- und Trockenpartie sowie eines Kalanders.The invention will be explained in more detail with reference to an exemplary embodiment. In the attached drawing, the figure shows a schematic representation of a Press and dryer section and a calender.
In der Pressenpartie 8 durchläuft die Faserstoffbahn 1 gemeinsam mit wenigstens
einem Preßfilz 13 zumindest einen von zwei Preßwalzen 14 gebildeten Preßspalt.
Hierbei nimmt der Preßfilz 13 das ausgepreßte Wasser auf und führt es von der
Faserstoffbahn 1 weg. Danach gelangt die Fasertoffbahn 1 zur Trockenpartie 2 die aus
mehreren Trockengruppen besteht, in denen die Faserstoffbahn 1 gemeinsam mit
einem Trockensieb 12 abwechselnd über beheizte Zylinder 3 und vorzugsweise
besaugte Leitwalzen 11 läuft. Dabei berührt die Unterseite der Faserstoffbahn 1 die
beheizten Zylinder 3 und das Trockensieb die Leitwalzen 11.In the
Nach erfolgter Trocknung wird die Faserstoffbahn 1 zu einem Kalander 4 zur
Erzeugung von Glanz und Glätte geführt.After drying, the fibrous web 1 is a
Dieser Kalander 4 besteht hier beispielhaft aus sechs übereinander angeordneten
Glättwalzen 10, die paarweise fünf Glättspalte 5 bilden, wobei von zwei benachbarten
Glättwalzen 5 eine beheizt und die andere durchbiegungsgesteuert ausgeführt ist.This
In der Pressenpartie 8 befindet sich ein Dampfblaskasten 9, der quer zur
Faserstoffbahn 1 zonenweise steuerbar ist und das Feuchtequerprofil beeinflußt. Am
Anfang der Trockenpartie 2 ist hierzu eine Feuchtequerprofil-Meßeinheit 7 angeordnet,
welche auf den Dampfblaskasten 9 einwirkt. Des weiteren befinden sich am Anfang der
Trockenpartie 2 eine der beheizten Unterseite der Faserstoffbahn 1 zugeordnete
Beeinflussungseinrichtung 6 sowie am Ende der Trockenpartie 2 zwei, auf
verschiedenen Seiten der Faserstoffbahn 1 angeordnete, weitere
Beeinflussungseinrichtungen 6 zur Befeuchtung. Alle Beeinflussungseinrichtungen 6
sind zonenweise steuerbar, wobei die Zonenbreite 25 - 30 mm beträgt und die
versprühten Wassertropfen kleiner als 100 um sind, und von nachgeordneten
Feuchtequerprofil-Meßeinheiten 7 beeinflußt. Während jedoch die Feuchtequerprofil-Meßeinheit
7 der ersten Beeinflussungseinrichtung 6 vor den letzten beiden
Beeinflussungseinrichtungen 6 angeordnet ist, besitzen die letzten beiden
Beeinflussungseinrichtungen 6 der Trockenpartie 2 eine gemeinsame, zwischen
Trockenpartie 2 und Kalander 4 vorhandene Feuchtigkeitsquerprofil-Meßeinheit 7.In the
Ergänzend wird auch die Möglichkeit dargestellt, daß das Feuchtequerprofil und damit
Glanz und Glätte im Kalander 4 mittels einer weiteren Beeinflussungseinrichtung 6
sowie einer nachfolgenden Feuchtigkeitsquerprofil-Meßeinheit 7 beeinflußt wird.
Nach dem Kalander wird die Faserstoffbahn aufgewickelt und weiterverarbeitet.In addition, the possibility is shown that the moisture profile and thus
Gloss and smoothness in the
Es sind hierbei jedoch auch andere Gestaltungen der Trockenpartie 2 möglich, wobei
beispielsweise beide Seiten der Faserstoffbahn 1 zumindest im Endbereich der
Trockenpartie 2 mit beheizten Zylindern 3 in Kontakt kommen. In diesen Fällen können
zunehmend auch auf beiden Seiten der Faserstoffbahn 1 Beeinflussungseinrichtungen
6 zur Befeuchtung angeordnet sein.However, in this case also other designs of the
Das dargestellte Beispiel ermöglicht Geschwindigkeiten von mehr als 1500 m/min,
wobei die Beeinflussungseinrichtungen 6 innerhalb der Trockenpartie 2 in einen Bereich
zwischen 40 % und 20 % Feuchtegehalt am Anfang der Trockenpartie 2 sowie in einem
Bereich zwischen 15 % und 10 % am Ende der Trockenpartie 2 angeordnet sind.
Prinzipiell sind natürlich auch noch mehr Beeinflussungseinrichtungen 6 innerhalb der
Trockenpartie 2 einsetzbar. Dabei beträgt die Faserstoffbahnlänge zwischen der letzten
Beeinflussungseinrichtung 6 zur Befeuchtung und dem ersten Glättspalt 5
beispielsweise 30 m, was das ausreichende Eindringen des Wassers in die
Faserstoffbahn 1 bis zum Glätten erlaubt.The example shown allows speeds of more than 1500 m / min,
wherein the influencing means 6 within the
Durch die beständige Einflußnahme auf das Feuchtequerprofil sowie die
Feuchteverteilung über die Dicke der Faserstoffbahn 1 muß nicht mehr so stark in der
Trockenpartie 2 getrocknet werden.Due to the constant influence on the moisture cross profile and the
Moisture distribution over the thickness of the fibrous web 1 no longer has to be so strong in the
In der Folge sind Trockengehalte von maximal 93 % beziehungsweise 91 %
ausreichend, was zu großen Energieeinsparungen führt beziehungsweise die
Trockenpartie 2 verkürzt.As a result, dry contents of 93% and 91% respectively
sufficient, which leads to large energy savings or the
Die Messung des Feuchtequerprofils kann zum Beispiel auf bekannte Weise mit Infrarot-Technik erfolgen.The measurement of the moisture profile can, for example, in a known manner with Infrared technology done.
Claims (23)
- Method for drying and smoothing a fibrous web (1), in particular a paper web, in a machine for producing and/or finishing the same, comprising at least one drying section (2), in which the fibrous web (1) is led over a plurality of heated cylinders (3) and a calender having a plurality of smoothing nips (5), characterized in that at least one influence is exerted on the moisture distribution over the thickness and/or on the moisture transverse profile in the first two thirds of the drying section (2), and at least one further influence is exerted in the last third of the drying section (2) and/or between the drying section (2) and the calender (4).
- Method according to Claim 1, characterized in that the fibrous web (1) is dried at most to a dryness content of 93% in the drying section (2) and, within the drying section (2), an influence is repeatedly exerted on the moisture transverse profile of the fibrous web (1).
- Method according to Claim 2, characterized in that the fibrous web (1) is dried at most to a dryness content of 91% in the drying section (2).
- Method according to one of the preceding claims, characterized in that the moisture distribution over the thickness of the fibrous web (1) is formed as uniformly as possible during the drying operation at a plurality of locations, preferably by moistening at least one side of the fibrous web (1) .
- Method according to one of the preceding claims, characterized in that at least one influence is exerted on the moisture distribution over the thickness and/or the moisture transverse profile at a moisture content between 50% and 15%, preferably between 25% and 15%.
- Method according to one of the preceding claims, characterized in that at least one influence is exerted on the moisture distribution over the thickness and/or the moisture transverse profile at a moisture content between 20% and 8%, preferably between 15% and 8%.
- Method according to one of the preceding claims, characterized in that the fibrous web (1) runs through the drying section (1). and the calender (4) at a speed of more than 1200 m/min, preferably of more than 1500 m/min.
- Method according to one of the preceding claims, characterized in that the division of the fibrous web length between the last influence on the moisture distribution over the thickness and/or the moisture transverse profile, in particular via moistening, and the first smoothing nip (5) of the following calender (4) divided by the speed of the fibrous web (1) is at least one second.
- Method according to one of the preceding claims, characterized in that the fibrous web (1) is heated in the calender (4) and is pressed zone by zone in a controllable manner over the width of the fibrous web (1).
- Method according to one of the preceding claims, characterized in that the intensity of the influence via moistening and/or drying can be adjusted zone by zone over the width of the fibrous web (1).
- Method according to Claim 10, characterized in that the intensity of the moistening and/or drying is preferably influenced zone by zone by at least one measurement of the moisture transverse profile of the fibrous web (1) arranged after this influencing device (6).
- Device for drying and smoothing a fibrous web (1), in particular a paper web, in a machine for producing and/or finishing the same, comprising at least one drying section (2), in which the fibrous web (1) is led over a plurality of heated cylinders (3) and a calender having a plurality of smoothing nips (5), in particular for carrying out the method according to one of the preceding claims, characterized in that the fibrous web (1) is assigned at least two influencing devices (6) for drying or moistening, of which at least one is assigned in one of the first two thirds of the drying section and at least one further is assigned in the last third of the drying section (2) and/or in the region between the drying section (2) and the calender (4), and/or of which at least one is arranged in a region in which the fibrous web (1) has a moisture content between 50% and 15%, preferably between 25% and 15%, and at least one further is arranged in a region in which the said fibrous web (1) has a moisture content between 20% and 8%, preferably between 15% and 8%.
- Device according to Claim 12, characterized in that the influencing devices (6) for moistening, in particular in the last third of the drying section (2), spray water with the smallest possible droplet size in the region of less than 100 µm, preferably less than 80 µm, towards the fibrous web (1).
- Device according to Claim 12 or 13, characterized in that the intensity of the influencing devices (6) can be controlled zone by zone transversely with respect to the fibrous web (1).
- Device according to Claim 14, characterized in that the zone width of at least one influencing device (6) is less than 50 mm, preferably less than 25 mm.
- Device according to Claim 12 or 15, characterized in that the influencing devices (6) are assigned moisture transverse profile measuring units (7), which act on the control system of the influencing devices (6).
- Device according to Claim 16, characterized in that each influencing device (6) is in each case followed by a moisture transverse profile measuring unit (7).
- Device according to Claim 16 or 17, characterized in that there are a plurality of moisture transverse profile measuring units (7) and each moisture transverse profile measuring unit (7) is assigned one or two influencing devices (6).
- Device according to one of Claims 12 to 18, characterized in that in a press section (8) arranged before the drying section (2) for the purpose of dewatering there is at least one steam blower box (9) which can be controlled zone by zone transversely with respect to the fibrous web (1) in order to heat the fibrous web (1).
- Device according to one of Claims 12 to 19, characterized in that the calender (4) comprises at least three smoothing rolls (10) which in pairs in each case form a smoothing nip (5), at least one smoothing roll (10) being heated and at least one smoothing roll (10) being of controlled deflection design.
- Device according to one of Claims 12 to 20, characterized in that, at least predominantly, only one side of the fibrous web (1) comes into contact with heated cylinders (3) and, at least predominantly, only this side of the fibrous web (1) is assigned influencing devices (6).
- Device according to Claim 21, characterized in that, in the last third of the drying section (2), both sides of the fibrous web (1) are assigned at least one influencing device (6) in each case.
- Device according to one of Claims 12 to 21, characterized in that both sides are assigned influencing devices (6) and preferably both sides of the fibrous web (1) come into contact with heated cylinders (3).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19901400 | 1999-01-15 | ||
| DE19901400A DE19901400A1 (en) | 1999-01-15 | 1999-01-15 | Drying and smoothing unit for fibrous webs |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1020559A2 EP1020559A2 (en) | 2000-07-19 |
| EP1020559A3 EP1020559A3 (en) | 2001-01-17 |
| EP1020559B1 true EP1020559B1 (en) | 2005-04-13 |
Family
ID=7894378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99123079A Expired - Lifetime EP1020559B1 (en) | 1999-01-15 | 1999-11-22 | Device for drying and smoothing fibrous webs |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US6490813B1 (en) |
| EP (1) | EP1020559B1 (en) |
| DE (3) | DE19901400A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT17730U3 (en) * | 2022-07-05 | 2023-02-15 | Voith Patent Gmbh | machine and process |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2217781T3 (en) * | 1998-07-10 | 2004-11-01 | Metso Paper, Inc. | METHOD OF MANUFACTURE OF CALANDRATED PAPER. |
| FI110706B (en) * | 1999-03-04 | 2003-03-14 | Metso Paper Inc | A method for adjusting machine direction web humidity with a coating machine and calender |
| FI112102B (en) | 1999-03-04 | 2003-10-31 | Metso Paper Inc | A method for adjusting machine direction web humidity with a coating machine |
| DE10018945A1 (en) * | 1999-07-24 | 2001-01-25 | Voith Paper Patent Gmbh | Press section at a papermaking or paper finishing machine has a single press gap formed by two rollers for efficient water extraction in a small assembly without costly shoe press rollers |
| US6749723B2 (en) * | 2000-06-28 | 2004-06-15 | Metso Paper Karlstad Ab | Measuring arrangements in a shortened dry end of a tissue machine |
| FI109213B (en) | 2000-11-24 | 2002-06-14 | Metso Paper Inc | Method and apparatus for controlling the profile of the moisture content or coating amount of the paper web |
| FI114452B (en) * | 2001-08-10 | 2004-10-29 | Raute Oyj | Procedure and plant for the production of uniformly moist veneers |
| FI121081B (en) * | 2002-01-08 | 2010-06-30 | Metso Paper Automation Oy | Method and equipment associated with a paper machine or paper finishing device |
| JP3772756B2 (en) * | 2002-02-13 | 2006-05-10 | セイコーエプソン株式会社 | Nonvolatile semiconductor memory device |
| DE10233795A1 (en) * | 2002-07-25 | 2004-02-12 | Voith Paper Patent Gmbh | drying section |
| DE10325572A1 (en) * | 2003-06-05 | 2004-12-23 | Voith Paper Patent Gmbh | Process and assembly to make fibrous paper or carton has a final drying stage with short two-line drying unit with water spray jets |
| US9481777B2 (en) | 2012-03-30 | 2016-11-01 | The Procter & Gamble Company | Method of dewatering in a continuous high internal phase emulsion foam forming process |
| EP2963176B1 (en) * | 2015-04-23 | 2017-03-15 | Valmet S.p.A. | A yankee drying hood arrangement, a yankee drying cylinder fitted with a yankee drying hood arrangement and a method of drying a fibrous web |
| DE102017118218A1 (en) * | 2017-08-10 | 2019-02-14 | Voith Patent Gmbh | MACHINE AND METHOD FOR PRODUCING A FIBROUS WEB |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3622448A (en) * | 1968-02-16 | 1971-11-23 | Industrial Nucleonics Corp | System and method of process control, particularly papermaking processes in response to fraction defective measurements |
| US3658642A (en) * | 1968-12-18 | 1972-04-25 | Beloit Corp | Method of reducing curl in making a continuous web of paper |
| CA961325A (en) * | 1972-05-05 | 1975-01-21 | Midland-Ross Corporation | Device for adding a liquid component to a web |
| US3948721A (en) * | 1974-09-03 | 1976-04-06 | Winheim Karl H | Method and apparatus for wetting the web in paper making machines |
| SE7910025L (en) * | 1978-12-21 | 1980-06-22 | Midland Ross Corp | KIT AND DEVICE FOR DRYLY DRYING A CONTINUOUS CONTINUOUS MATERIAL MATCH OF CELLULOSA FIBER |
| US4378639A (en) | 1978-12-21 | 1983-04-05 | Midland-Ross Corporation | Method and apparatus for uniformly drying a continuous web of cellulosic fibers |
| DE4301023C3 (en) * | 1993-01-16 | 2001-07-26 | V I B Systems Gmbh | Device for increasing the gloss and / or smoothness of a paper web |
| DE9414963U1 (en) | 1994-09-16 | 1994-11-03 | J.M. Voith Gmbh, 89522 Heidenheim | Dryer section |
| US5771603A (en) | 1994-09-16 | 1998-06-30 | Voith Sulzer Papiermashinen Gmbh | Dryer section |
| US5592751A (en) * | 1994-11-23 | 1997-01-14 | Voith Sulzer Papiermaschinen Gmbh | Dryer section having combination of single and double tier dryer groups |
| DE29521501U1 (en) * | 1995-12-22 | 1997-05-28 | Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim | Dryer section |
| CA2309656C (en) | 1997-11-14 | 2008-04-29 | Valmet Corporation | Method for producing calendered paper |
-
1999
- 1999-01-15 DE DE19901400A patent/DE19901400A1/en not_active Withdrawn
- 1999-01-15 DE DE29924829U patent/DE29924829U1/en not_active Expired - Lifetime
- 1999-11-22 DE DE59911903T patent/DE59911903D1/en not_active Expired - Fee Related
- 1999-11-22 EP EP99123079A patent/EP1020559B1/en not_active Expired - Lifetime
-
2000
- 2000-01-18 US US09/484,446 patent/US6490813B1/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT17730U3 (en) * | 2022-07-05 | 2023-02-15 | Voith Patent Gmbh | machine and process |
Also Published As
| Publication number | Publication date |
|---|---|
| DE29924829U1 (en) | 2005-12-08 |
| DE19901400A1 (en) | 2000-07-20 |
| US6490813B1 (en) | 2002-12-10 |
| EP1020559A2 (en) | 2000-07-19 |
| DE59911903D1 (en) | 2005-05-19 |
| EP1020559A3 (en) | 2001-01-17 |
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