EP3359734A1 - Method for producing a fibrous material web - Google Patents

Method for producing a fibrous material web

Info

Publication number
EP3359734A1
EP3359734A1 EP16766540.5A EP16766540A EP3359734A1 EP 3359734 A1 EP3359734 A1 EP 3359734A1 EP 16766540 A EP16766540 A EP 16766540A EP 3359734 A1 EP3359734 A1 EP 3359734A1
Authority
EP
European Patent Office
Prior art keywords
fibrous web
felt
yankee
suction roll
roll
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
Application number
EP16766540.5A
Other languages
German (de)
French (fr)
Other versions
EP3359734B1 (en
Inventor
Andreas Anzel
Klaus Gissing
Thomas Scherb
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andritz AG
Original Assignee
Andritz AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Andritz AG filed Critical Andritz AG
Publication of EP3359734A1 publication Critical patent/EP3359734A1/en
Application granted granted Critical
Publication of EP3359734B1 publication Critical patent/EP3359734B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/006—Making patterned paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D21F1/74—Pulp catching, de-watering, or recovering; Re-use of pulp-water using cylinders
    • D21F1/76—Pulp catching, de-watering, or recovering; Re-use of pulp-water using cylinders with suction
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D21F1/74—Pulp catching, de-watering, or recovering; Re-use of pulp-water using cylinders
    • D21F1/78—Pulp catching, de-watering, or recovering; Re-use of pulp-water using cylinders with pressure
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0272—Wet presses in combination with suction or blowing devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/10—Suction rolls, e.g. couch rolls
    • 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
    • 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
    • D21F7/08—Felts
    • D21F7/083—Multi-layer felts
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/002—Tissue paper; Absorbent paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D21F11/145—Making cellulose wadding, filter or blotting paper including a through-drying process

Definitions

  • the subject of this invention is a process for producing a fibrous web, in particular for
  • inventive method can be performed.
  • the production of high quality paper takes place
  • Fibrous suspension is introduced at a forming roller between a felt and a sieve, the
  • Suction roller is guided, which is wrapped by a permeable press belt.
  • a permeable press belt Through the press belt is the
  • the invention has for its object to provide a method for tissue production, can be produced in the highest possible tissue.
  • the fibrous web is performed in the process together with the forming fabric and the felt immediately after the forming roll on a suction roll and further dewatered there.
  • the fibrous web In the area of the suction roll, no press belt is arranged, but the fibrous web is enclosed only by the forming fabric and the felt, thereby allowing gentle dewatering.
  • the felt is located between suction roll and fibrous web and the forming wire wraps around the Fibrous web outside.
  • the fibrous web should preferably be flowed through by a hot fluid at the suction roll, for example, hot air at a temperature of about 150 ° C, in particular over 200 ° C, preferably above 250 ° C.
  • a hot fluid at the suction roll for example, hot air at a temperature of about 150 ° C, in particular over 200 ° C, preferably above 250 ° C.
  • Hot air should preferably be above 150 gH 2 0 / kgAir,
  • the supplied hot air should preferably be the exhaust air of the Yankee hood.
  • the felt, the fibrous web and the forming fabric in the initial region of the suction roll, ie in the region in which the fibrous web comes into contact with the suction roll, are flowed through by steam. As a result, the temperature of the fibrous web is further increased, the
  • the suction roll or the suction roll hood can also be divided into several zones, for example into two zones, viewed in the machine direction.
  • the fibrous web is then transported on the felt to the Yankee and there via a press or prefers a shoe press on the Yankee surface
  • the entire machine then only needs two strings, the forming fabric and the felt. It is favorable if the transfer of the fibrous web to the Yankee takes place with the aid of a shoe press roll, which is wrapped by the felt more than 60 °, preferably more than 90 °, ideally more than 120 °. As a result, the currently used deflection roller can be omitted below the shoe press roll.
  • Dry content after the forming unit not only 10%, but more than 20%, in particular more than 25%,
  • Impingement dryer or with a radiation dryer for example infrared radiator.
  • the dry content is then greater than 25%, in particular greater than 30%, preferably greater than 35%.
  • the advantage is that the fibrous web reaches the press at the Yankee with a dry content of more than 30%, instead of only 20% to 23% in conventional systems. With this higher dry content are the fibers
  • the felt has a fine-pored structure, wherein the average pore size of the fibrous web-facing surface of the felt is smaller than the average pore size of the suction roll pointing page.
  • a fine and soft felt top to the fibrous web increases the contact surface between felt and fibrous web, whereby the Kapillarent camesstation is favored.
  • a coarser felt structure to the suction roll on the other hand favors the removal of water through the
  • the fineness of the finer felt surface should be less than 6.7 dtex, preferably less than 3.3 dtex, the layer directly below it should have a fineness of less than 17 dtex, preferably less than 11 dtex, whereas the opposite felt side facing the suction roll would then be much more open is to drain the water through the
  • dtex values refer to the basic fiber content of the felt.
  • the subject of this invention is also an apparatus for producing tissue according to claim 10.
  • Forming roller is lifted from the fibrous web, is dried and then brought back in contact with the fibrous web before the suction roll.
  • Crescentformer 10 is introduced via a headbox 1 in the region of the forming roller 2 between a felt 4 and a forming fabric 3.
  • the felt 4 and the forming fabric 3 wrap around a part of the outer periphery of the forming roll 2, thereby the water the pulp suspension centrifuged by centrifugal forces through the forming fabric 3 to the outside.
  • the felt 4 is arranged on the inside.
  • the fibrous web 9 has after the forming roller 2 a dry content of
  • the felt 4, the fibrous web 9 and the forming fabric 3 are guided over a suction roll 11, which is looped in regions.
  • the suction roller 11 sucks through the felt 4, the moisture from the fibrous web 9, it finds a here
  • Umschlingungs the suction roller 11 a steam blower box 12 is arranged, flows through the hot steam on the fibrous web 9 and this heated.
  • the fibrous web 9 after the suction roll 11 has a solids content of about 25% to 30%.
  • Fiber web 9 lifted. Thereafter, in the present example, an impact drying 8. Also, a drying by means of radiation (eg infrared radiation) would be conceivable.
  • the impingement dryer 8 is on the side of the
  • Fiber web 9 arranged.
  • the fibrous web then has a solids content of about 30% to 35%.
  • the fibrous web 9 is transferred by means of a shoe press roll 5 from the felt 4 onto a Yankee 6.
  • the shoe press roll 5 is transferred by means of a shoe press roll 5 from the felt 4 onto a Yankee 6.
  • Shoe press roll 5 is wrapped by felt 4 with a wrap angle ⁇ of ⁇ 175 °.
  • ⁇ the wrap angle of ⁇ 175 °.
  • Fibrous ahn 9 dried in a known manner with over the Yankee hood 7 supplied hot air and scraped at the end.
  • the dry content of the fibrous web 9 when transferring to the Yankee 6 is approximately 50%.

Landscapes

  • Paper (AREA)
  • Sanitary Thin Papers (AREA)

Abstract

The invention relates to a method for producing a fibrous material web (9), particularly for producing a tissue or hygienic paper web, in which a fibrous suspension is dewatered in a crescent former (10) to obtain a fibrous material web (9), and dried on a Yankee (6). After the crescent former (10), the fibrous material web (9) is guided along with the forming screen (3) and felt (4) over a suction roller (11) downstream of the forming roller (2). The invention also relates to a device for carrying out the claimed method.

Description

VERFAHREN ZUR HERSTELLUNG EINER FASERSTOFFBAHN METHOD FOR PRODUCING A FIBROUS WEB
Den Gegenstand dieser Erfindung bildet ein Verfahren zur Herstellung einer Faserstoffbahn, insbesondere zur The subject of this invention is a process for producing a fibrous web, in particular for
Herstellung einer Tissue- oder Hygienepapierbahn. Dabei wird eine FaserstoffSuspension zur Bildung einer Production of a tissue or hygiene paper web. This is a pulp suspension to form a
Faserstoffbahn in einem Crescent former entwässert und mit Hilfe eines Yankees getrocknet. Im Crescentformer wird die FaserstoffSuspension über einen Stoffauflauf zwischen einem Formiersieb und einem Filz eingebracht und im Bereich einer Formierwalze zentrifugal entwässert. Gegenstand dieser Erfindung bildet auch eine Vorrichtung mit der das Fibrous web dewatered in a Crescent former and dried using a Yankee. In Crescentformer the pulp suspension is introduced via a headbox between a forming fabric and a felt and dewatered centrifugally in the region of a forming roll. The subject of this invention also forms a device with the
erfindungsgemäße Verfahren durchgeführt werden kann. Die Herstellung von hochqualitativem Papier erfolgt inventive method can be performed. The production of high quality paper takes place
traditionell mit TAD Maschinen. Diese erlauben die traditionally with TAD machines. These allow the
Herstellung sehr guter Produktqualität, sind aber sehr teuer in der Anschaffung und auch die spezifischen Producing very good product quality, but are very expensive to purchase and also the specific ones
Energiekosten sind weit höher als bei konventionellen dry- crepe Maschinen, die einen Yankee aufweisen. Energy costs are much higher than conventional dry-crepe machines that have a Yankee.
In konventionellen Tissuemaschinen mit Crescentformern, d.h. mit Formiereinheiten bei denen die In conventional tissue machines with crescent formers, i. with forming units where the
FaserstoffSuspension bei einer Formierwalze zwischen einem Filz und einem Sieb eingebracht wird, wird die  Fibrous suspension is introduced at a forming roller between a felt and a sieve, the
Faserstoffbahn durch die an der Formierwalze auftretenden Zentrifugalkräfte auf ungefähr 10% Trockengehalt  Fiber web through the centrifugal forces occurring at the forming roller to about 10% dry content
entwässert. Im Anschluss wird die Faserstoffbahn auf dem Filz weitertransportiert, auf einen Trockengehalt von ungefähr 20% bis 23% vakuumentwässert und schlussendlich, nachdem eine weitere Entwässerung am nassen Filz durch Vakuum nicht mehr möglich ist, in einer Pressensektion mechanisch gepresst. Dabei steigt der Trockengehalt auf ungefähr 40%. Danach erfolgt die thermische Trocknung am Yankee . dewatered. Subsequently, the fibrous web is transported on the felt, dakuumentwässert to a dry content of about 20% to 23% vacuum and finally, after further dewatering of the wet felt by vacuum is no longer possible, mechanically pressed in a press section. The dry content increases about 40%. Thereafter, the thermal drying takes place on the Yankee.
Die Pressung der Faserstoffbahn in einer Presssektion beeinflusst die Qualität der Tissuebahn negativ. Durch das Pressen der noch feuchten Papierbahn verliert es an Bulk. Die Pressung ist aber häufig notwendig, damit man den erforderlichen Trockengehalt erreicht, bevor die Bahn an den Yankee übergeben werden kann. Die DE 10 2011 007 568 AI beschreibt eine Tissuemaschine bei der die Faserstoffbahn vor dem Yankee über eine  The pressing of the fibrous web in a press section negatively affects the quality of the tissue web. By pressing the still wet paper web it loses bulk. However, the pressing is often necessary to achieve the required dry content before the web can be transferred to the Yankee. DE 10 2011 007 568 AI describes a tissue machine in which the fibrous web in front of the Yankee via a
Saugwalze geführt wird, die von einem permeablen Pressband umschlungen wird. Durch das Pressband wird die Suction roller is guided, which is wrapped by a permeable press belt. Through the press belt is the
Faserstoffbahn weniger stark komprimiert als in Fibrous web less compressed than in
herkömmlichen Pressen, jedoch treten auch dabei conventional presses, however, also occur
Qualitätseinbußen auf. Quality losses.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Tissueherstellung bereitzustellen, bei dem möglichst hochwertiges Tissue produziert werden kann. The invention has for its object to provide a method for tissue production, can be produced in the highest possible tissue.
Gelöst wird diese Aufgabe durch ein Herstellungsverfahren gemäß Patentanspruch 1. Erfindungsgemäß wird beim Verfahren die Faserstoffbahn gemeinsam mit dem Formiersieb und dem Filz gleich nach der Formierwalze über eine Saugwalze geführt und dort weiter entwässert . This object is achieved by a manufacturing method according to claim 1. According to the invention, the fibrous web is performed in the process together with the forming fabric and the felt immediately after the forming roll on a suction roll and further dewatered there.
Im Bereich der Saugwalze ist kein Pressband angeordnet, sondern die Faserstoffbahn wird nur vom Formiersieb und vom Filz eingeschlossen, dadurch kann eine sanfte Entwässerung erfolgen. Der Filz befindet sich dabei zwischen Saugwalze und Faserstoffbahn und das Formiersieb umschlingt die Faserstoffbahn außen. Über das Formiersieb kann somit ein sanfter Pressdruck auf die Faserstoffbahn ausgeübt werden, im Bereich der Saugwalze sollte jedoch die Zugspannung des Formiersiebes kleiner als 15 kN/m, vorzugsweise kleiner als 12 kN/m sein. In the area of the suction roll, no press belt is arranged, but the fibrous web is enclosed only by the forming fabric and the felt, thereby allowing gentle dewatering. The felt is located between suction roll and fibrous web and the forming wire wraps around the Fibrous web outside. Thus, a gentle pressure can be exerted on the fibrous web via the forming fabric, but in the region of the suction roll, the tensile stress of the forming fabric should be less than 15 kN / m, preferably less than 12 kN / m.
Die Faserstoffbahn sollte vorzugsweise bei der Saugwalze von einem heißen Fluid durchströmt werden, beispielsweise von heißer Luft mit einer Temperatur von über 150 °C, insbesondere über 200°C, vorzugsweise über 250°C. The fibrous web should preferably be flowed through by a hot fluid at the suction roll, for example, hot air at a temperature of about 150 ° C, in particular over 200 ° C, preferably above 250 ° C.
Die Luftfeuchtigkeit der über die Haube zugeführten The humidity of the supplied via the hood
Heißluft sollte vorzugsweise über 150 gH20/kgLuft, Hot air should preferably be above 150 gH 2 0 / kgAir,
insbesondere über 300 gH2Ü/kgLuft, vorzugsweise sogar über 450 gH20/kgLuft betragen. Die zugeführte Heißluft sollte vorzugsweise die Abluft der Yankee Haube sein. in particular more than 300 gH 2 Ü / kgAir, preferably even more than 450 gH 2 0 / kgAir. The supplied hot air should preferably be the exhaust air of the Yankee hood.
Es ist günstig, wenn der Filz, die Faserstoffbahn und das Formiersieb im Anfangsbereich der Saugwalze, also in dem Bereich, in dem die Faserstoffbahn mit der Saugwalze in Kontakt kommt, von Dampf durchströmt werden. Dadurch wird die Temperatur der Faserstoffbahn weiter erhöht, die It is advantageous if the felt, the fibrous web and the forming fabric in the initial region of the suction roll, ie in the region in which the fibrous web comes into contact with the suction roll, are flowed through by steam. As a result, the temperature of the fibrous web is further increased, the
Viskosität des Wassers sinkt und die Vakuumentwässerung wird verbessert. Die Saugwalze bzw. die Saugwalzenhaube kann auch in Maschinenlaufrichtung betrachtet in mehrere Zonen, beispielsweise in zwei Zonen unterteilt sein. Viscosity of the water drops and the vacuum dewatering is improved. The suction roll or the suction roll hood can also be divided into several zones, for example into two zones, viewed in the machine direction.
Dadurch kann in der ersten Zone eine Entwässerung mit anderen Betriebsparametern erfolgen, beispielsweise mit einem höheren Druck, einer höheren Temperatur oder mit einem anderen Medium. This can be done in the first zone, a drainage with other operating parameters, for example, with a higher pressure, a higher temperature or with another medium.
Vorteilhafterweise wird die Faserstoffbahn dann am Filz bis zum Yankee transportiert und dort über eine Presse oder bevorzugt eine Schuhpresse auf die Yankeeoberfläche Advantageously, the fibrous web is then transported on the felt to the Yankee and there via a press or prefers a shoe press on the Yankee surface
übergeben. Die gesamte Maschine benötigt dann nur noch zwei Bespannungen, das Formiersieb und den Filz. Es ist günstig, wenn die Übergabe der Faserstoffbahn auf den Yankee mit Hilfe einer Schuhpresswalze erfolgt, die vom Filz mehr als 60°, vorzugsweise mehr als 90°, idealerweise mehr als 120° umschlungen wird. Dadurch kann die derzeit verwendete Umlenkwalze unterhalb der Schuhpresswalze entfallen. to hand over. The entire machine then only needs two strings, the forming fabric and the felt. It is favorable if the transfer of the fibrous web to the Yankee takes place with the aid of a shoe press roll, which is wrapped by the felt more than 60 °, preferably more than 90 °, ideally more than 120 °. As a result, the currently used deflection roller can be omitted below the shoe press roll.
Gegenüber konventionellen Maschinen beträgt der Compared to conventional machines is the
Trockengehalt nach der Formiereinheit nicht nur 10%, sondern mehr als 20%, insbesondere mehr als 25%, Dry content after the forming unit not only 10%, but more than 20%, in particular more than 25%,
vorzugsweise mehr als 30%. Zwischen Formiereinheit undpreferably more than 30%. Between forming unit and
Yankee steht noch genügend Platz für weitere Aggregate zur Verfügung. So kann dort ein weiterer Trocknungsschritt durchgeführt werden, beispielsweise mit einem Yankee still has enough space for additional units available. Thus, there can be carried out a further drying step, for example with a
Prallströmtrockner oder mit einem Strahlungstrockner (z.B. Infrarotstrahler) . Der Trockengehalt ist dann danach größer als 25%, insbesondere größer 30%, vorzugsweise größer 35%. Impingement dryer or with a radiation dryer (for example infrared radiator). The dry content is then greater than 25%, in particular greater than 30%, preferably greater than 35%.
Der Vorteil ist, dass die Faserstoffbahn die Presse beim Yankee mit einem Trockengehalt von mehr als 30% erreicht, anstelle von nur 20% bis 23% in herkömmlichen Anlagen. Mit diesem höheren Trockengehalt sind die Fasern The advantage is that the fibrous web reaches the press at the Yankee with a dry content of more than 30%, instead of only 20% to 23% in conventional systems. With this higher dry content are the fibers
widerstandsfähiger gegen mechanisches Pressen. Dies ergibt einen Gewinn an Bulk nach der Presse. Es ist günstig, wenn der Filz eine feinporige Struktur aufweist, wobei die durchschnittliche Porengrößer der zur Faserstoffbahn weisenden Oberfläche des Filzes kleiner ist als die durchschnittliche Porengröße der zur Saugwalze weisenden Seite. Eine feine und weiche Filzoberseite zur Faserstoffbahn vergrößert die Kontakt fläche zwischen Filz und Faserstoffbahn, wodurch die Kapillarentwässerung begünstigt wird. Eine gröbere Filzstruktur zur Saugwalze hin begünstigt hingegen die Wasserabfuhr durch die more resistant to mechanical pressing. This results in a gain in bulk after the press. It is favorable if the felt has a fine-pored structure, wherein the average pore size of the fibrous web-facing surface of the felt is smaller than the average pore size of the suction roll pointing page. A fine and soft felt top to the fibrous web increases the contact surface between felt and fibrous web, whereby the Kapillarentwässerung is favored. A coarser felt structure to the suction roll on the other hand favors the removal of water through the
perforierte Saugwalzenoberfläche ins Walzeninnere. Die Feinheit der feineren Filzoberfläche sollte weniger als 6,7 dtex, vorzugsweise weniger 3,3 dtex betragen, die Schicht direkt darunter sollte eine Feinheit von weniger als 17 dtex, vorzugsweise weniger 11 dtex aufweisen, wohingegen die gegenüberliegende zur Saugwalze weisende Filzseite dann viel offener ist, um die Abfuhr des Wassers durch die perforated suction roller surface into the interior of the roller. The fineness of the finer felt surface should be less than 6.7 dtex, preferably less than 3.3 dtex, the layer directly below it should have a fineness of less than 17 dtex, preferably less than 11 dtex, whereas the opposite felt side facing the suction roll would then be much more open is to drain the water through the
Bohrungen der Saugwalze zu erleichtern. Diese dtex-Werte beziehen sich auf den Grundfaseranteil des Filzes. To facilitate drilling of the suction roll. These dtex values refer to the basic fiber content of the felt.
Gegenstand dieser Erfindung bildet auch eine Vorrichtung zur Herstellung von Tissue gemäß Patentanspruch 10. The subject of this invention is also an apparatus for producing tissue according to claim 10.
Es ist auch denkbar, dass das Formiersieb nach der It is also conceivable that the forming fabric after the
Formierwalze von der Faserstoffbahn abgehoben wird, getrocknet wird und dann wieder vor der Saugwalze mit der Faserstoffbahn in Kontakt gebracht wird. Forming roller is lifted from the fibrous web, is dried and then brought back in contact with the fibrous web before the suction roll.
Im Folgenden wird ein Ausführungsbeispiel der Erfindung anhand von Figur 1 beschrieben. In the following an embodiment of the invention will be described with reference to FIG.
In Figur 1 wird die FaserstoffSuspension in einem In Figure 1, the pulp suspension in a
Crescentformer 10 über einen Stoffauflauf 1 im Bereich der Formierwalze 2 zwischen einem Filz 4 und einem Formiersieb 3 eingebracht. Crescentformer 10 is introduced via a headbox 1 in the region of the forming roller 2 between a felt 4 and a forming fabric 3.
Der Filz 4 und das Formiersieb 3 umschlingen einen Teil des Außenumfangs der Formierwalze 2, dadurch wird das Wasser der FaserstoffSuspension durch Zentrifugalkräfte durch das Formiersieb 3 nach außen geschleudert. Der Filz 4 wird dabei an der Innenseite angeordnet. Die Faserstoffbahn 9 hat nach der Formierwalze 2 einen Trockengehalt von The felt 4 and the forming fabric 3 wrap around a part of the outer periphery of the forming roll 2, thereby the water the pulp suspension centrifuged by centrifugal forces through the forming fabric 3 to the outside. The felt 4 is arranged on the inside. The fibrous web 9 has after the forming roller 2 a dry content of
ungefähr 10%. about 10%.
Im Anschluss an diese Zentrifugalentwässerung wird der Filz 4, die Faserstoffbahn 9 und das Formiersieb 3 über eine Saugwalze 11 geführt, die bereichsweise umschlungen wird. Die Saugwalze 11 saugt durch den Filz 4 die Feuchtigkeit aus der Faserstoffbahn 9, es findet hier eine Following this centrifugal dewatering, the felt 4, the fibrous web 9 and the forming fabric 3 are guided over a suction roll 11, which is looped in regions. The suction roller 11 sucks through the felt 4, the moisture from the fibrous web 9, it finds a here
Vakuumentwässerung statt. Vacuum dewatering instead.
Zur Verbesserung der Entwässerung ist im anfänglichen To improve the drainage is in the initial
Umschlingungsbereich der Saugwalze 11 ein Dampfblaskasten 12 angeordnet, über den heißer Dampf auf die Faserstoffbahn 9 strömt und diese so erwärmt. Die Faserstoffbahn 9 hat nach der Saugwalze 11 einen Trockengehalt von ungefähr 25% bis 30%. Umschlingungsbereich the suction roller 11 a steam blower box 12 is arranged, flows through the hot steam on the fibrous web 9 and this heated. The fibrous web 9 after the suction roll 11 has a solids content of about 25% to 30%.
Da im Bereich der Saugwalze 11 die Faserstoffbahn 9 noch sehr feucht ist, kommt es hier kaum zu Since in the region of the suction roller 11, the fibrous web 9 is still very moist, it hardly comes here
Verdampfungsprozessen. Hier wird vielmehr durch die Evaporation processes. Here is rather by the
Wärmezufuhr die Viskosität des Wassers in der Heat input the viscosity of the water in the
Faserstoffbahn 9 herabgesetzt, wodurch das Wasser über die Saugwalze 11 aus der Faserstoffbahn 9 gesaugt wird. Der feinporige Filz 4 unterstützt die Entwässerung durch Decreased fibrous web 9, whereby the water is sucked through the suction roller 11 from the fibrous web 9. The fine-pored felt 4 supports the drainage through
Kapillarentwässerung . Nach der Saugwalze 11 wird das Formiersieb 3 von der Capillary drainage. After the suction roller 11, the forming fabric 3 of the
Faserstoffbahn 9 abgehoben. Danach erfolgt im vorliegenden Beispiel eine Aufpralltrocknung 8. Auch eine Trocknung mittels Strahlung (z.B. Infrarotstrahlung) wäre denkbar. Der Prallströmtrockner 8 ist dabei auf der Seite der Fiber web 9 lifted. Thereafter, in the present example, an impact drying 8. Also, a drying by means of radiation (eg infrared radiation) would be conceivable. The impingement dryer 8 is on the side of the
Faserstoffbahn 9 angeordnet. Die Faserstoffbahn hat dann einen Trockengehalt von ungefähr 30% bis 35%. Fiber web 9 arranged. The fibrous web then has a solids content of about 30% to 35%.
Schlussendlich wird die Faserstoffbahn 9 mit Hilfe einer Schuhpresswalze 5 vom Filz 4 auf einen Yankee 6 übergeben. Im vorliegenden Ausführungsbeispiel wird die Finally, the fibrous web 9 is transferred by means of a shoe press roll 5 from the felt 4 onto a Yankee 6. In the present embodiment, the
Schuhpresswalze 5 vom Filz 4 mit einem Umschlingungswinkel α von ~ 175° umschlungen. Am Yankee 6 wird die Shoe press roll 5 is wrapped by felt 4 with a wrap angle α of ~ 175 °. At Yankee 6, the
Faserstoff ahn 9 in bekannter Weise mit über die Yankee Haube 7 zugeführter Heißluft getrocknet und am Ende abgeschabt. Der Trockengehalt der Faserstoffbahn 9 bei der Übergabe auf den Yankee 6 liegt ungefähr bei 50%. Fibrous ahn 9 dried in a known manner with over the Yankee hood 7 supplied hot air and scraped at the end. The dry content of the fibrous web 9 when transferring to the Yankee 6 is approximately 50%.

Claims

Patentansprüche claims
1. Verfahren zur Herstellung einer Faserstoffbahn (9), insbesondere zur Herstellung einer Tissue- oder 1. A process for producing a fibrous web (9), in particular for producing a tissue or
Hygienepapierbahn, bei dem eine FaserstoffSuspension zur Bildung einer Faserstoffbahn (9) in einem Crescentformer (10) entwässert wird und die Faserstoffbahn (9) mit Hilfe eines Yankees (6) getrocknet wird, wobei im Crescentformer (10) die FaserstoffSuspension über einen Stoffauflauf (1) zwischen einem Formiersieb (3) und einem Filz (4) Hygienic paper web in which a pulp suspension to form a fibrous web (9) in a Crescentformer (10) is dehydrated and the fibrous web (9) by means of a Yankee (6) is dried, wherein in the Crescentformer (10) the pulp suspension via a headbox (1 ) between a forming fabric (3) and a felt (4)
eingebracht und im Bereich einer Formierwalze (2) introduced and in the region of a forming roll (2)
zentrifugal entwässert wird, dadurch gekennzeichnet, dass die Faserstoffbahn (9) gemeinsam mit dem Formiersieb (3) und dem Filz (4) unmittelbar nach der Formierwalze (2) über eine Saugwalze (11) geführt wird. is centrifugally dehydrated, characterized in that the fibrous web (9) is guided together with the forming fabric (3) and the felt (4) immediately after the forming roll (2) via a suction roll (11).
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Faserstoffbahn (9) die Saugwalze (11) bereichsweise umschlingt und dort von einem heißen Fluid durchströmt wird. 2. The method according to claim 1, characterized in that the fibrous web (9) wraps around the suction roll (11) in regions and there is flowed through by a hot fluid.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass das die Faserstoffbahn (9) auf der Saugwalze (11) von heißer Luft mit einer Temperatur von über 150°C, 3. The method according to claim 2, characterized in that the fibrous web (9) on the suction roll (11) of hot air at a temperature of about 150 ° C,
insbesondere über 200°C, vorzugsweise über 250°C in particular above 200 ° C, preferably above 250 ° C
durchströmt wird. is flowed through.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die Faserstoffbahn (9) auf der Saugwalze (11) von feuchter Heißluft durchströmt wird, wobei der Feuchtegehalt über 150 gH20/kgLuft, insbesondere über 300 gH20/kgLuft, vorzugsweise sogar über 450 gH20/kgLuft beträgt. 4. The method according to claim 3, characterized in that the fibrous web (9) on the suction roll (11) is flowed through by moist hot air, wherein the moisture content above 150 gH 2 0 / kgAir, in particular over 300 gH 2 0 / kgAir, preferably even above 450 gH 2 0 / kgAir.
5. Verfahren nach Anspruch 3 oder 4, dadurch gekennzeichnet:, dass die zugeführte Heißluft die Abluft einer Yankee Haube 7 ist. 5. The method according to claim 3 or 4, characterized in that the supplied hot air is the exhaust air of a Yankee hood 7.
6. Verfahren nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, dass die Faserstoffbahn (9) im 6. The method according to any one of claims 2 to 5, characterized in that the fibrous web (9) in
Anfangsbereich der Saugwalze (11) von Dampf durchströmt wird . Steam is flowed through at the beginning of the suction roll (11).
7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Faserstoffbahn (9) auf dem Filz (4) bis zum Yankee (6) transportiert wird. 7. The method according to any one of claims 1 to 6, characterized in that the fibrous web (9) on the felt (4) to the Yankee (6) is transported.
8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die Faserstoffbahn (9) mit Hilfe einer Schuhpresse (5) auf den Yankee (6) übergeben wird, wobei die 8. The method according to claim 7, characterized in that the fibrous web (9) by means of a shoe press (5) is transferred to the Yankee (6), wherein the
Schuhpresswalze (5) vom Filz mehr als 60°, vorzugswiese mehr als 90°, idealerweise mehr als 120° umschlungen wird. Shoe press roller (5) from the felt more than 60 °, preferably more than 90 °, ideally more than 120 ° is wrapped.
9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Feinheit der zur Faserstoffbahn weisenden Filzoberfläche weniger als 6,7 dtex, 9. The method according to any one of claims 1 to 8, characterized in that the fineness of the fibrous web facing felt surface is less than 6.7 dtex,
vorzugsweise weniger 3,3 dtex beträgt, wobei die Schicht direkt darunter eine Feinheit von weniger als 17 dtex, vorzugsweise weniger 11 dtex aufweist und die Feinheit der zur Saugwalze weisenden Filzoberfläche größer als 17 dtex ist . preferably less than 3.3 dtex, the layer directly below having a fineness of less than 17 dtex, preferably less than 11 dtex, and the fineness of the felt surface facing the suction roll being greater than 17 dtex.
10. Verfahren nach einem der Ansprüche 1 bis 9 dadurch gekennzeichnet, dass die Faserstoffbahn (9) vor dem Yankee (6) und nach der Saugwalze (11) durch einen 10. The method according to any one of claims 1 to 9, characterized in that the fibrous web (9) in front of the Yankee (6) and after the suction roll (11) by a
Prallströmtrockner (8) vorgetrocknet wird. Impact flow dryer (8) is pre-dried.
11. Vorrichtung zur Herstellung von Tissue mit einem 11. Apparatus for the production of tissue with a
Crescentformer (10) und einem Yankee (6), wobei der Crescentformer (10) and a Yankee (6), wherein the
Crescentformer (10) einen Stoffauflauf (1), eine Crescentformer (10) a headbox (1), a
Formierwalze (2), einen Filz (4) und ein Formiersieb (3) umfasst, wobei der Filz (4) zwischen Formierwalze (2) und Faserstoffbahn (9) angeordnet ist, dadurch gekennzeichnet, dass unmittelbar nach der Formierwalze (2) eine Saugwalze (11) angeordnet ist, wobei der Filz (4) , die Faserstoffbahn (9) und das Formiersieb (3) die Saugwalze (11) umschlingt. Forming roller (2), a felt (4) and a forming fabric (3), wherein the felt (4) between Formierwalze (2) and fibrous web (9) is arranged, characterized in that immediately after the Formierwalze (2) a suction roll (11), wherein the felt (4), the fibrous web (9) and the forming fabric (3) wraps around the suction roll (11).
12. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass nach der Saugwalze (11) und vor dem Yankee (6) eine weitere thermische Trocknungsvorrichtung (8), insbesondere ein Prallströmtrockner, vorgesehen ist. 12. The apparatus according to claim 11, characterized in that after the suction roll (11) and in front of the Yankee (6), a further thermal drying device (8), in particular an impingement dryer, is provided.
13. Vorrichtung nach einem der Ansprüche 11 oder 12, dadurch gekennzeichnet, dass in der Tissuemaschine außer dem Filz (4) und dem Formiersieb (3) keine weitere 13. Device according to one of claims 11 or 12, characterized in that in the tissue machine except the felt (4) and the forming fabric (3) no further
Bespannung vorgesehen ist. Covering is provided.
14. Vorrichtung nach einem der Ansprüche 11 oder 13, dadurch gekennzeichnet, dass die Übergabe der 14. Device according to one of claims 11 or 13, characterized in that the transfer of the
Faserstoffbahn (9) auf den Yankee (6) mit Hilfe einer Schuhpresswalze (5) übergeben, die vom Filz (4) mehr als 60°, vorzugsweis mehr als 90°, idealerweise mehr als 120° umschlugen ist. Pass the fibrous web (9) on the Yankee (6) by means of a shoe press roll (5), which is from the felt (4) more than 60 °, preferably more than 90 °, ideally more than 120 ° turned over.
EP16766540.5A 2015-10-06 2016-09-15 Method and machine for producing a fibrous web Active EP3359734B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50853/2015A AT517330B1 (en) 2015-10-06 2015-10-06 METHOD FOR PRODUCING A FIBROUS WEB
PCT/EP2016/071818 WO2017060053A1 (en) 2015-10-06 2016-09-15 Method for producing a fibrous material web

Publications (2)

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EP3359734A1 true EP3359734A1 (en) 2018-08-15
EP3359734B1 EP3359734B1 (en) 2019-05-08

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US (1) US10808360B2 (en)
EP (1) EP3359734B1 (en)
CN (1) CN106968120B (en)
AT (1) AT517330B1 (en)
ES (1) ES2740877T3 (en)
WO (1) WO2017060053A1 (en)

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DE102018123389A1 (en) * 2018-09-24 2020-02-13 Voith Patent Gmbh Machine and method for producing a fibrous web
CN109267414B (en) * 2018-10-30 2023-09-22 华南理工大学 Cylinder forming device and method
EP3963135A1 (en) * 2019-05-03 2022-03-09 Voith Patent GmbH Seamed felt and use of the seamed felt in a tissue machine
DE102019123811A1 (en) * 2019-09-05 2021-03-11 Voith Patent Gmbh Method and device for producing a fibrous web
SE544018C2 (en) * 2020-01-09 2021-11-02 Valmet Oy A tissue paper making machine
AT522459B1 (en) 2020-01-30 2020-11-15 Andritz Ag Maschf DEVICE AND METHOD FOR MANUFACTURING A FIBER WEB
US20240018721A1 (en) * 2020-12-07 2024-01-18 Voith Patent Gmbh Device and method for producing a fibrous web

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US3224928A (en) * 1961-12-21 1965-12-21 Kimberly Clark Co Papermaking machine using a moving felt through a pressure forming slice and the same felt throughout the machine
FI74060C (en) * 1975-09-17 1987-12-10 Valmet Oy tissue Paper Machine
DE19912226A1 (en) * 1999-03-18 2000-09-28 Sca Hygiene Prod Gmbh Method and device for producing tissue paper and the tissue paper obtainable therewith
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WO2001000925A1 (en) 1999-06-29 2001-01-04 Valmet-Karlstad Ab Apparatus and method for making textured tissue paper
DE10003684A1 (en) * 2000-01-28 2001-08-02 Voith Paper Patent Gmbh Machine and method for producing a tissue web
BR0112114B1 (en) * 2000-06-30 2013-04-02 Method for the manufacture of a cellulosic web.
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DE102011007568A1 (en) 2011-04-18 2012-10-18 Voith Patent Gmbh Apparatus and method for producing a material web
AT517329B1 (en) * 2015-10-05 2017-01-15 Andritz Ag Maschf METHOD FOR PRODUCING A FIBROUS WEB

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WO2017060053A1 (en) 2017-04-13
US20190360155A1 (en) 2019-11-28
AT517330A4 (en) 2017-01-15
CN106968120A (en) 2017-07-21
AT517330B1 (en) 2017-01-15
EP3359734B1 (en) 2019-05-08
CN106968120B (en) 2020-05-19
US10808360B2 (en) 2020-10-20
ES2740877T3 (en) 2020-02-06

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