EP2576895B1 - Machine, method and use of the machine for producing a paper web, in particular a sack paper web - Google Patents

Machine, method and use of the machine for producing a paper web, in particular a sack paper web Download PDF

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Publication number
EP2576895B1
EP2576895B1 EP11722392.5A EP11722392A EP2576895B1 EP 2576895 B1 EP2576895 B1 EP 2576895B1 EP 11722392 A EP11722392 A EP 11722392A EP 2576895 B1 EP2576895 B1 EP 2576895B1
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Prior art keywords
press
section
smoothing
paper web
roll
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EP11722392.5A
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German (de)
French (fr)
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EP2576895A2 (en
Inventor
Georg Bacovsky
Wolfgang Schwarz
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Voith Patent GmbH
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Voith Patent GmbH
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    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • 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
    • D21F1/022—Means for injecting material into flow within the headbox
    • 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
    • D21F1/18—Shaking apparatus for wire-cloths and associated parts
    • D21F1/20—Shaking apparatus for wire-cloths and associated parts in Fourdrinier machines
    • 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
    • D21F3/0218—Shoe presses
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • 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
    • D21H27/10—Packing paper
    • 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod

Definitions

  • the invention relates to a machine for producing a compressed or non-compressed sack paper web having a headbox, a wire section, a press section, a dryer section and a take-up unit. Furthermore, the invention relates to a method and a use according to the preambles of claims 10 and 14.
  • Sack paper also called sack kraft paper
  • Sack paper is made from pulp fibers, mainly from long fiber pulp, as this results in a high strength and a high porosity of the paper.
  • From sack paper bags are e.g. for the packaging of cement or other powdered products.
  • Important properties of the sack paper are high strength with sufficient elongation, high porosity and sufficient rigidity. These properties are not only necessary because of the load on the bags during transport, but also because of the filling of the bags. This should happen as quickly as possible and not only a high strength and elasticity is required, but also a high porosity or air permeability. So much air can escape during filling from the empty bag through the sack paper.
  • the bag would burst or it would escape a lot of dust by the outflow of air through the filling.
  • one side of the paper web, the later outer side of the bag should always be easier to print, which requires a higher degree of smoothness.
  • Known machines for the production of sack paper have a headbox which evenly distributes the fiber suspension over the width, namely on or between the wires in the wire section.
  • the sheet or the web is formed by dewatering the suspension on a forming fabric or between two forming fabrics.
  • the paper machine has a plurality of wire sections, each with associated headboxes, each forming a layer as a separate web. After sheet formation in the wire section, the web is dewatered in a press section with several press nips so far that a dry content of about 40% is achieved.
  • the individual webs from the wire sections are brought together one above the other and in the press section together marautscht to a multi-layer paper web.
  • the press section is designed as a so-called central roller press, in which two of the three press nips are formed with a common central roller.
  • the dryer section follows, in which the paper web is passed over heated cylinders and thus dried.
  • a known compression device is for example the so-called Clupak device.
  • the paper web is guided together with a thicker elastic band over a drying cylinder or another roller. At least one point on the circumference of the drying cylinder, the paper web and the strip are guided through a gap which is formed by a pressure roll or a pressing element and which is narrower than the thickness of the elastic strip.
  • the elastic band and with it the paper web are thereby compressed in the running direction.
  • the cover by the band prevents the web from being creped visibly.
  • the compression increases the later extensibility of the sack paper.
  • the documents WO 98/54404 and DE 10 2004 036 276 A1 discloses a press section of a machine for producing a paper web with only one press nip.
  • the press nip is formed by a shoe roll and a counter roll.
  • the document US 3,327,952 discloses a method of making fibrous material for the production of paper and board. It is intended to treat a suspension with high consistency in a grinder with two opposing grinding elements. The distance between these grinding elements is half the mean fiber length of the fibers in the suspension.
  • the document DE 199 26 805 A1 describes a method and a headbox for metering an additional fluid into the suspension to produce a paper web.
  • the shoe calender roll has a flexible coat that sticks over one on top of the other extending yoke supporting, hydraulically pressed shoe is guided. As a result, a longer smooth nip is produced at a reduced pressure compared to the conventional calender. Nevertheless, the porosity of the sack paper produced in this way is significantly lower than that of sack paper that was produced on a machine without any calendering. The result is that the filling properties of the bag are still deteriorated compared to the conventional quality. In known machines, therefore, a compromise between improved printability and good filling properties will always be required.
  • the object of the invention is to develop a machine for the production of sack paper so that improved printability of the sack paper is achieved without impairing the use or filling properties.
  • the smoothness of the sack paper web should be increased without the porosity being reduced too much.
  • the counter roll has a cylindrical
  • the jacket and the shoe press roll have a flexible jacket, which is guided over a hydraulically pressed press shoe which is supported on a fixed yoke.
  • longer press nips can be produced than with a roll nip, which leads to an increase in the dry content after the press section.
  • Another advantage of the press section with only a single press nip is that the paper web no longer has to be transferred between the various press nips, which form several drive groups, and thus also less loses elasticity. This has an additional positive effect on the use and filling properties of the bags.
  • the press section with only one press nip also reduces the energy required to drive the machine and reduces maintenance and repair costs.
  • a calender in a preferred machine, can be present, the calender should contain only a single smoothing nip.
  • the wet paper web in the press is much more compressible than the dried paper web after the dryer section, more volume and porosity in the press can thus be obtained by only one nip than by densification in the single nip of the calender joining the dryer section , again reduced.
  • the smoothness of the surface can be significantly improved
  • the single press nip is designed as a shoe press nip, double felted.
  • the dewatering performance and thus the dry content of the paper web is further increased since water from the paper web can be pressed out via the upper and lower side into the respective press felts.
  • the paper web no longer has to be removed from a smooth press roll or a smooth, water-impermeable press belt to which it adheres, which additionally increases its remaining elasticity. Due to the higher dry content, the tension, ie the difference in speed between the press section and the dryer section, can be reduced, which likewise increases the extensibility in the direction of travel and the transverse strength to the direction of travel in the paper web.
  • the length of the shoe press nip in the web running direction is at least 220 mm, preferably at least 270 mm. At a high length, the residence time in the press nip increases, thereby improving drainage.
  • the machine according to the invention can be further improved in that the calender is designed as a shoe caliper with an extended smoothing nip formed by a heatable smoothing roll and a shoe calendering roll.
  • the smoothing roll has a cylindrical shell
  • the shoe press roll has a flexible shell, which is guided over a supported on a fixed yoke, hydraulically pressed shoe.
  • the extended smooth nip leads to a gentler smoothing and thus to less compaction.
  • the heatable smoothing roller may be the lower roller in the calender.
  • the underside of the paper web which is usually the smoother side already out of the wire section, comes into contact with the heatable smoothing roll, which has a stronger smoothing effect than the shoe-smoothing roll.
  • a compression device may be present within the dryer section, in which the paper web is compressed against the direction of travel at a dry content of between 60% and 80%.
  • the stretchability of the paper web measured as elongation at break is increased by 5-15%.
  • the paper machine preceded in the process flow is a stock preparation, in which the fiber suspension is treated in various apparatuses, before they then fed via the machine chest as temporary storage the headbox becomes.
  • One type of apparatus for the mentioned treatment are refiner.
  • the fiber suspension is passed in the narrow gap between two discs which rotate relative to each other.
  • the discs are provided with surface structures having ribs or edges.
  • the aim of the treatment is, for example, to shorten the fibers or to fibrillate their surface by the shearing stress in the gap.
  • An improvement in paper properties can furthermore be achieved if high-consistency refiners, which treat the paper stock at a solids concentration in the treated suspension of between 25 and 40%, are present in a stock preparation according to the invention. This also increases the strength of the paper web formed later.
  • the stock suspension may be treated in low consistency refiners at a solids concentration between 3 and 5% before being fed to the machine chest from which the machine is supplied.
  • a disadvantage of the refining treatment, namely that it also reduces the porosity of the paper web produced is avoided by the press section with only a single press nip, which causes a lower compression than on conventional paper machines.
  • At least one headbox of the machine according to the invention is equipped with means for dilution water control, as for example EP 1236828 A1 are known.
  • the possibility is provided to be able to regulate the throughput, the solids density and thus the basis weight and the fiber orientation in sections over the width in zones.
  • the cross-section of the weight per unit area of the paper web is regulated by feeding more water into the corresponding zone at heavy points in or in front of the headbox, and thus the consistency in the suspension in this zone is reduced. If it's too light it's the other way around. Due to the thus improved basis weight cross profile of the paper web, a more uniform porosity, strength and extensibility of the sack paper is achieved over the width of the paper web.
  • Fig.1 a machine for producing single-ply sack paper is shown. Over the headbox (1), the stock suspension is distributed evenly across the width on the forming fabric.
  • the wire section (2) is designed here as a wire screening section, ie the suspension is dewatered only through a forming fabric towards the bottom.
  • a twin-wire former would also be possible in which the suspension is applied between two forming fabrics and is dewatered on both sides (top and bottom).
  • the wire section shown is equipped with a Sieb thoroughlyelvorraum (8), which moves the screen in the transverse direction quickly back and forth.
  • the press section (3) has only a single shoe press nip, which is formed by a counter-roller and a shoe press roll (9).
  • the shoe press roll (9) is above and the counter roll below.
  • the shoe press nip is double felted with an endless top felt and an endless underfelt.
  • the paper web is removed by a suction roll from the forming fabric and transferred to the top felt.
  • the web is transferred after the press section by a suction roll, from the lower felt to the drying wire of the first drying group.
  • the dryer section (FIGS. 4A and 4B) consists of a plurality of dryer groups, with the front dryer groups in the exemplary machine being single-row and the dryer group arranged further back in two rows.
  • a drying group is characterized in that all cylinders and rollers form a drive group therein.
  • Single-row dryer groups consist of a series of heatable cylinders and a number of guide rollers, which can be acted upon by vacuum, wherein the web is guided together with an endlessly circulating drying wire in alternation on the cylinders and the guide rollers.
  • Double-row dryer groups have an upper and a lower row of heatable cylinders over which the web is alternately guided.
  • An upper dryer wire successively wraps around the cylinders of the upper row and a lower dryer wire successively wraps around the cylinders of the lower row.
  • an upsetting device 5 is provided in the illustrated embodiment, which is embodied as a so-called Clupak unit with an elastic band 10.
  • a calender 6 follows with a shoe-smoothing nipple The calender provides improved printability by increasing the smoothness, particularly of the underside, The sack paper web (12) is then placed in the final roll-up unit (7 ) wound up.

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Description

Die Erfindung betrifft eine Maschine zur Herstellung einer gestauchten oder ungestauchten Sackpapierbahn, die einen Stoffauflauf, eine Siebpartie, eine Pressenpartie, eine Trockenpartie und eine Aufrolleinheit aufweist. Weiterhin betrifft die Erfindung ein Verfahren und eine Verwendung gemäß den Oberbegriffen der Ansprüche 10 und 14.The invention relates to a machine for producing a compressed or non-compressed sack paper web having a headbox, a wire section, a press section, a dryer section and a take-up unit. Furthermore, the invention relates to a method and a use according to the preambles of claims 10 and 14.

Sackpapier, auch Sackkraftpapier genannt, wird aus Zellstofffasern hergestellt, überwiegend aus Langfaserzellstoff, da dieser eine hohe Festigkeit und eine hohe Porosität des Papiers ergibt. Aus Sackpapier werden Säcke z.B. für die Verpackung von Zement oder anderen pulverförmigen Produkten hergestellt. Wichtige Eigenschaften des Sackpapiers sind hohe Festigkeit bei ausreichender Dehnung, hohe Porosität und ausreichende Steifigkeit. Diese Eigenschaften sind nicht nur wegen der Belastung der Säcke beim Transport notwendig, sondern auch wegen der beim Befüllen der Säcke. Dies soll möglichst schnell geschehen und dazu ist nicht nur eine hohe Festigkeit und Dehnfähigkeit erforderlich, sondern auch eine hohe Porosität beziehungsweise Luftdurchlässigkeit. So kann viel Luft beim Befüllen aus dem leeren Sack durch das Sackpapier entweichen. Andernfalls würde der Sack platzen oder es würde viel Staub durch das Abströmen der Luft durch die Befüllöffnung entweichen. In zunehmendem Maße soll zusätzlich noch eine Seite der Papierbahn, die spätere Außenseite des Sackes, immer besser bedruckbar sein, was eine höhere Glätte voraussetzt.Sack paper, also called sack kraft paper, is made from pulp fibers, mainly from long fiber pulp, as this results in a high strength and a high porosity of the paper. From sack paper bags are e.g. for the packaging of cement or other powdered products. Important properties of the sack paper are high strength with sufficient elongation, high porosity and sufficient rigidity. These properties are not only necessary because of the load on the bags during transport, but also because of the filling of the bags. This should happen as quickly as possible and not only a high strength and elasticity is required, but also a high porosity or air permeability. So much air can escape during filling from the empty bag through the sack paper. Otherwise, the bag would burst or it would escape a lot of dust by the outflow of air through the filling. Increasingly, in addition, one side of the paper web, the later outer side of the bag, should always be easier to print, which requires a higher degree of smoothness.

Bekannte Maschinen zur Herstellung von Sackpapier haben einen Stoffauflauf der die Fasersuspension gleichmäßig über der Breite verteilt und zwar auf oder zwischen die Siebe in der Siebpartie. In der Siebpartie wird durch Entwässern der Suspension auf einem Formiersieb oder zwischen zwei Formiersieben wird das Blatt bzw. die Bahn gebildet. Bei der Herstellung von mehrlagigem Papier weist die Papiermaschine mehrere Siebpartien mit jeweils zugeordneten Stoffaufläufen auf, die jeweils eine Lage als separate Bahn bilden. Nach der Blattbildung in der Siebpartie wird die Bahn in einer Pressenpartie mit mehreren Pressnips so weit entwässert, dass ein Trockengehalt von etwa 40% erreicht wird. Bei mehrlagigem Papier werden die einzelnen Bahnen aus den Siebpartien übereinander zusammengeführt und in der Pressenpartie miteinander zu einer mehrlagigen Papierbahn vergautscht. Mehrere, meistens drei Pressnips sind hintereinander notwendig, um eine ausreichende Entwässerungsleistung für einen hohen Trockengehalt zu erbringen. Ein zu geringer Trockengehalt nach der Presse würde zu erhöhten Trocknungsenergiekosten und zu einem schlechten Bahnlauf mit vielen Abrissen in der Trockenpartie führen. In den bekannten Maschinen ist die Pressenpartie als sogenannte Zentralwalzenpresse ausgeführt, bei der zwei der drei Pressnips mit einer gemeinsamen Zentralwalze gebildet werden. Nach der Pressenpartie folgt die Trockenpartie, in der die Papierbahn über beheizte Zylinder geführt und so getrocknet wird.Known machines for the production of sack paper have a headbox which evenly distributes the fiber suspension over the width, namely on or between the wires in the wire section. In the wire section, the sheet or the web is formed by dewatering the suspension on a forming fabric or between two forming fabrics. In the production of multi-ply paper, the paper machine has a plurality of wire sections, each with associated headboxes, each forming a layer as a separate web. After sheet formation in the wire section, the web is dewatered in a press section with several press nips so far that a dry content of about 40% is achieved. With multi-ply paper, the individual webs from the wire sections are brought together one above the other and in the press section together geschautscht to a multi-layer paper web. Several, usually three press nips are needed in succession to provide sufficient drainage performance for a high dry content. Too little dry content after the press would lead to increased drying energy costs and poor web travel with many tears in the dryer section. In the known machines, the press section is designed as a so-called central roller press, in which two of the three press nips are formed with a common central roller. After the press section, the dryer section follows, in which the paper web is passed over heated cylinders and thus dried.

Innerhalb oder am Ende der Trockenpartie befindet sich bei Maschinen zur Herstellung von gestauchtem Sackpapier eine Staucheinrichtung. Eine bekannte Staucheinrichtung ist beispielsweise die sogenannte Clupak-Vorrichtung. Hierbei wird die Papierbahn zusammen mit einem dickeren elastischen Band über einen Trockenzylinder oder eine andere Walze geführt. An mindestens einer Stelle am Umfang des Trockenzylinders werden Papierbahn und Band durch einen Spalt geführt, der durch eine Anpresswalze oder ein Anpresselement gebildet wird und der enger ist als die Dicke des elastischen Bandes. Das elastische Band und mit ihm die Papierbahn werden dadurch in Laufrichtung gestaucht. Die Abdeckung durch das Band verhindert, dass die Bahn sichtbar gekreppt wird. Die Stauchung erhöht die spätere Dehnbarkeit des Sackpapiers.Inside or at the end of the dryer section is in machines for producing compressed sack paper a compression device. A known compression device is for example the so-called Clupak device. In this case, the paper web is guided together with a thicker elastic band over a drying cylinder or another roller. At least one point on the circumference of the drying cylinder, the paper web and the strip are guided through a gap which is formed by a pressure roll or a pressing element and which is narrower than the thickness of the elastic strip. The elastic band and with it the paper web are thereby compressed in the running direction. The cover by the band prevents the web from being creped visibly. The compression increases the later extensibility of the sack paper.

Die Dokumente WO 98/54404 und DE 10 2004 036 276 A1 offenbaren eine Pressenpartie einer Maschine zum Herstellen einer Papierbahn mit nur einem Pressnip. Der Pressnip wird dabei durch eine Schuhwalze und eine Gegenwalze gebildet.The documents WO 98/54404 and DE 10 2004 036 276 A1 discloses a press section of a machine for producing a paper web with only one press nip. The press nip is formed by a shoe roll and a counter roll.

Im Dokument DE 299 24 920 U1 ist eine Pressenanordnung zur Behandlung einer Faserstoffbahn mit einer doppelt befilzten Schuhpresse beschrieben.In the document DE 299 24 920 U1 a press arrangement for treating a fibrous web with a double-felted shoe press is described.

Im Nassteil einer Papiermaschine werden umlaufende Siebe und Filze zur Entwässerung der zu produzierenden Papierbahn eingesetzt. Diese werden über Saugelemente zur Abführung des der Papierbahn entzogenen Wassers geführt. Zur Streckung dieser Bänder quer zur Umlaufrichtung schlägt das Dokument EP 1 449 958 A1 vor, eine Trageinrichtung mit einer Vielzahl von im Abstand voneinander angeordneten Stützelementen zur Stützung der Siebe oder Filze vorzusehen, Die Trageinrichtung kann quer zur Umlaufrichtung oszillierbar ausgeführt sein.In the wet part of a paper machine, rotating screens and felts are used for dewatering the paper web to be produced. These are about Suction elements for discharging the withdrawn from the paper web water out. To stretch these bands transversely to the direction of rotation suggests the document EP 1 449 958 A1 to provide a support device with a plurality of spaced-apart support elements for supporting the screens or felts, The support means may be designed to be oscillatable transversely to the direction of rotation.

Das Dokument US 3 327 952 offenbart ein Verfahren zur Herstellung von Fasermaterial für die Produktion von Papier und Karton. Es ist dabei vorgesehen, eine Suspension mit hoher Stoffdichte in einem Mahlwerk mit zwei gegenüberliegenden Mahlelementen zu behandelt. Der Abstand dieser Mahlelemente beträgt dabei die Hälfte der mittleren Faserlänge der Fasern in der Suspension.The document US 3,327,952 discloses a method of making fibrous material for the production of paper and board. It is intended to treat a suspension with high consistency in a grinder with two opposing grinding elements. The distance between these grinding elements is half the mean fiber length of the fibers in the suspension.

Das Dokument DE 199 26 805 A1 beschreibt ein Verfahren und einen Stoffauflauf zur Zudosierung eines zusätzlichen Fluids in die Suspension zur Herstellung einer Papierbahn.The document DE 199 26 805 A1 describes a method and a headbox for metering an additional fluid into the suspension to produce a paper web.

Sackpapier, das auf diesen bekannten Maschinen hergestellt wird, hat keine ausreichende Glätte für eine verbesserte Bedruckbarkeit. Eine Erhöhung der Glätte mit einem konventionellen Glättwerk, bei dem der oder die Glättnips aus im Wesentlichen zylindrischen Walzen gebildet werden, führt dazu, dass die Bahn so stark verdichtet wird, dass die Porosität auf zu niedrige Werte reduziert wird. In DE 102008043727 A1 und EP2186939A2 ist deshalb ein Verfahren beschrieben, bei dem nach der Trockenpartie ein Schuhglättwerk, auch Breitnipkalander genannt, eingesetzt wird. Das Schuhglättwerk enthält einen Glättnip, der von einer beheizbaren, im Wesentlichen zylindrischen Gegenwalze und einer Schuhglättwalze gebildet wird. Die Schuhglättwalze hat einen flexiblen Mantel, der über einen sich auf einem festste henden Joch abstützenden, hydraulisch angepressten Schuh geführt wird. Dadurch wird ein längerer Glättnip mit reduziertem Druck im Vergleich zum konventionellen Glättwerk erzeugt. Die Porosität des so hergestellten Sackpapiers ist allerdings trotzdem deutlich niedriger als die von Sackpapier, das auf einer Maschine ganz ohne Glättwerk hergestellt wurde. Das führt dazu, dass die Befülleigenschaften des Sackes gegenüber der herkömmlichen Qualität trotzdem verschlechtert werden. Bei bekannten Maschinen wird deshalb immer ein Kompromiss zwischen verbesserter Bedruckbarkeit und guten Befülleigenschaften erforderlich sein.Sack paper made on these known machines does not have sufficient smoothness for improved printability. Increasing the smoothness with a conventional calender, in which the trowel or tufts are formed from substantially cylindrical rollers, causes the web to be densified so much that the porosity is reduced to too low values. In DE 102008043727 A1 and EP2186939A2 Therefore, a method is described in which after the dryer section a shoe calender, also called Breitnipkalander used. The Schuhglättwerk contains a smoothing nip, which is formed by a heatable, substantially cylindrical counter-roller and a Schuhglättwalze. The shoe calender roll has a flexible coat that sticks over one on top of the other extending yoke supporting, hydraulically pressed shoe is guided. As a result, a longer smooth nip is produced at a reduced pressure compared to the conventional calender. Nevertheless, the porosity of the sack paper produced in this way is significantly lower than that of sack paper that was produced on a machine without any calendering. The result is that the filling properties of the bag are still deteriorated compared to the conventional quality. In known machines, therefore, a compromise between improved printability and good filling properties will always be required.

Die Aufgabe der Erfindung ist es, eine Maschine zur Herstellung von Sackpapier so weiter zu entwickeln, das eine verbesserte Bedruckbarkeit des Sackpapiers erzielt wird, ohne dass dabei die Gebrauchs- oder Befülleigenschaften verschlechtert werden. Insbesondere soll die Glätte der Sackpapierbahn erhöht werden, ohne dass die Porosität zu stark reduziert wird.The object of the invention is to develop a machine for the production of sack paper so that improved printability of the sack paper is achieved without impairing the use or filling properties. In particular, the smoothness of the sack paper web should be increased without the porosity being reduced too much.

Die Aufgabe wird erfindungsgemäß durch die Merkmale der kennzeichnenden Teile der Ansprüche 1, 10 und 14 gelöst. Weitere vorteilhafte Ausgestaltungen des Verfahrens nach Anspruch 10 ergeben sich den Merkmalen der Anspruche 11-13. Dadurch dass die Papierbahn in der Pressenpartie nur durch einen einzigen Pressnip geführt wird, wird sie bei der Entwässerung nicht mehr so stark verdichtet. Insgesamt kann damit die Porosität des Sackpapiers auf hohem Niveau gehalten werden. Gemessen wird die Porosität zum Beispiel als Gurley-Wert (ISO 5636-5, TAPPI T460). Dabei wird die Zeit gemessen, die bei vorgegebenem Druck benötigt wird, um ein Luftvolumen von 100ml durchs Papier zu drücken. Je kleiner der Wert ist, umso poröser und luftdurchlässiger ist das Papier. Mit der erfindungsgemäßen Maschine werden Gurley-Werte im hergestellten Sackpapier von kleiner als 7s/100ml insbesondere kleiner oder gleich 5s/100ml oder sogarThe object is achieved by the features of the characterizing parts of claims 1, 10 and 14. Further advantageous embodiments of the method according to claim 10 result from the features of claims 11-13. The fact that the paper web is guided in the press section only by a single press nip, it is not compressed so much during drainage. Overall, this allows the porosity of the sack paper to be kept at a high level. The porosity is measured, for example, as the Gurley value (ISO 5636-5, TAPPI T460). It measures the time it takes for a given pressure to push an air volume of 100ml through the paper. The smaller the value, the more porous and air permeable the paper is. With the machine according to the invention, Gurley values in the produced sack paper of less than 7 s / 100 ml, in particular less than or equal to 5 s / 100 ml or even

Durch die Ausgestaltung des Pressnips als Schuhpressnip kann ein hoher Trockengehalt sogar bis zu 45% und mehr erreicht werden, ohne dass wie bisher mehrere Pressnips dafür nötig sind. Die Gegenwalze hat einen zylindrischen Mantel und die Schuhpresswalze hat einen flexiblen Mantel, der über einen sich auf einem feststehenden Joch abstützenden, hydraulisch angepressten Pressschuh geführt wird. Dadurch können längere Pressnips als mit einem Walzennip erzeugt werden, was zu der Erhöhung des Trockengehaltes nach der Pressenpartie führt. Ein weiterer Vorteil der Pressenpartie mit nur noch einem einzigen Pressnip ist, dass die Papierbahn nicht mehr zwischen den verschiedenen Pressnips, die mehrere Antriebsgruppen bilden, übergeben werden muss, und dadurch auch weniger an Dehnfähigkeit verliert. Das wirkt sich zusätzlich positiv auf die Gebrauchs- und Befülleigenschaften der Säcke aus.Due to the design of the press nips as a shoe press nip, a high dry content even up to 45% or more can be achieved without the need for several press nips as before. The counter roll has a cylindrical The jacket and the shoe press roll have a flexible jacket, which is guided over a hydraulically pressed press shoe which is supported on a fixed yoke. As a result, longer press nips can be produced than with a roll nip, which leads to an increase in the dry content after the press section. Another advantage of the press section with only a single press nip is that the paper web no longer has to be transferred between the various press nips, which form several drive groups, and thus also less loses elasticity. This has an additional positive effect on the use and filling properties of the bags.

Die Pressenpartie mit nur einem Pressnip führt außerdem zu einem geringeren Energiebedarf für den Antrieb der Maschine und zu geringeren Wartungs- und Instandhaltungskosten.The press section with only one press nip also reduces the energy required to drive the machine and reduces maintenance and repair costs.

In einer bevorzugten Maschine kann ein Glättwerk vorhanden sein, wobei das Glättwerk nur einen einzigen Glättnip enthalten sollte. Da die nasse Papierbahn in der Presse viel kompressibler ist als die getrocknete Papierbahn nach der Trockenpartie kann somit mehr Volumen und Porosität in der Presse durch nur einen Nip gewonnen werden, als durch die Verdichtung in dem einzigen Glättnip des Glättwerks, das sich an die Trockenpartie anschließt, wieder reduziert wird. Und trotzdem kann die Glätte der Oberfläche signifikant verbessert werdenIn a preferred machine, a calender can be present, the calender should contain only a single smoothing nip. As the wet paper web in the press is much more compressible than the dried paper web after the dryer section, more volume and porosity in the press can thus be obtained by only one nip than by densification in the single nip of the calender joining the dryer section , again reduced. And yet, the smoothness of the surface can be significantly improved

In einer weiteren vorteilhaften Ausführung der Erfindung ist der einzige Pressnip der als Schuhpressnip ausgeführt ist, doppelt befilzt. Dadurch wird zum einen die Entwässerungsleistung und damit der Trockengehalt der Papierbahn weiter erhöht, da Wasser aus der Papierbahn über Ober- und Unterseite in die jeweiligen Pressfilze ausgepresst werden kann. Und zum anderen muss die Papierbahn nicht mehr von einer glatten Presswalze oder einem glatten wasserundurchlässigen Pressband, an dem sie haftet, abgezogen werden, was ihre verbleibende Dehnfähigkeit zusätzlich erhöht. Durch den höheren Trockengehalt kann der Zug, d.h. die Geschwindigkeitsdifferenz zwischen Pressenpartie und Trockenpartie, reduziert werden, was ebenfalls die Dehnfähigkeit in Laufrichtung und die Festigkeit quer zur Laufrichtung in der Papierbahn erhöht.In a further advantageous embodiment of the invention, the single press nip is designed as a shoe press nip, double felted. As a result, on the one hand the dewatering performance and thus the dry content of the paper web is further increased since water from the paper web can be pressed out via the upper and lower side into the respective press felts. On the other hand, the paper web no longer has to be removed from a smooth press roll or a smooth, water-impermeable press belt to which it adheres, which additionally increases its remaining elasticity. Due to the higher dry content, the tension, ie the difference in speed between the press section and the dryer section, can be reduced, which likewise increases the extensibility in the direction of travel and the transverse strength to the direction of travel in the paper web.

Darüber hinaus kann es von Vorteil sein, wenn die Länge des Schuhpressnips in Bahnlaufrichtung mindestens 220mm bevorzugt mindestens 270mm beträgt. Bei einer hohen Länge steigt die Verweilzeit im Pressnip, wodurch die Entwässerung verbessert wird.In addition, it may be advantageous if the length of the shoe press nip in the web running direction is at least 220 mm, preferably at least 270 mm. At a high length, the residence time in the press nip increases, thereby improving drainage.

Die erfindungsgemäße Maschine kann weiterhin dadurch verbessert werden, dass das Glättwerk als Schuhglättwerk mit einem verlängerten Glättnip ausgeführt ist, der von einer beheizbaren Glättwalze und einer Schuhglättwalze gebildet wird. Die Glättwalze hat einen zylindrischen Mantel, während die Schuhpresswalze einen flexiblen Mantel hat, der über einen sich auf einem feststehenden Joch abstützenden, hydraulisch angepressten Schuh geführt wird. Der verlängerte Glättnip führt zu einer schonenderen Glättung und damit zu weniger Verdichtung.The machine according to the invention can be further improved in that the calender is designed as a shoe caliper with an extended smoothing nip formed by a heatable smoothing roll and a shoe calendering roll. The smoothing roll has a cylindrical shell, while the shoe press roll has a flexible shell, which is guided over a supported on a fixed yoke, hydraulically pressed shoe. The extended smooth nip leads to a gentler smoothing and thus to less compaction.

In einer vorteilhaften Ausgestaltung kann die beheizbare Glättwalze die untere Walze im Glättwerk sein. Dadurch kommt die Unterseite der Papierbahn, die meist bereits aus der Siebpartie heraus die glattere Seite ist, in Kontakt mit der beheizbaren Glättwalze, welche eine stärkere Glättwirkung als die Schuhglättwalze hat.In an advantageous embodiment, the heatable smoothing roller may be the lower roller in the calender. As a result, the underside of the paper web, which is usually the smoother side already out of the wire section, comes into contact with the heatable smoothing roll, which has a stronger smoothing effect than the shoe-smoothing roll.

Weiterhin kann in der erfindungsgemäßen Maschine eine Staucheinrichtung innerhalb der Trockenpartie vorhanden sein, in der die Papierbahn bei einem Trockengehalt zwischen 60% und 80% entgegen der Laufrichtung gestaucht wird. Dadurch wird die Dehnfähigkeit der Papierbahn gemessen als Bruchdehnung um 5-15% erhöht.Furthermore, in the machine according to the invention, a compression device may be present within the dryer section, in which the paper web is compressed against the direction of travel at a dry content of between 60% and 80%. As a result, the stretchability of the paper web measured as elongation at break is increased by 5-15%.

Es ist darüber hinaus günstig, in der Siebpartie eine Siebschüttelvorrichtung vorzusehen, die ein Formiersieb im Wesentlichen quer zur Laufrichtung hinundherbewegt. Dadurch wird die Festigkeit der Papierbahn bereits bei der Blattbildung erhöht, was das Risiko einer geringeren Festigkeitsausbildung in der Pressenpartie durch die reduzierte Verdichtung kompensieren kann.It is also beneficial to provide a Siebschüttelvorrichtung in the wire section, which moves a Formiersieb substantially transversely to the direction of travel. As a result, the strength of the paper web is already increased during sheet formation, which can compensate for the risk of a lower strength formation in the press section due to the reduced compression.

Der Papiermaschine im Prozessablauf vorangeschaltet ist eine Stoffaufbereitung, in der die Fasersuspension in verschiedenen Apparaten behandelt wird, bevor sie dann über die Maschinenbütte als Zwischenspeicherung dem Stoffauflauf zugeführt wird. Eine Art von Apparaten zur genannten Behandlung sind Refiner. In diesen wird die Fasersuspension im engen Spalt zwischen zwei Scheiben, die sich relativ zueinander drehen, hindurchgeführt. Die Scheiben sind mit Oberflächenstrukturen versehen, die Rippen oder Kanten aufweisen. Ziel der Behandlung ist es, durch die Scherbelastung im Spalt die Fasern zum Beispiel zu kürzen oder ihre Oberfläche zu fibrillieren. Durch diese Behandlung der Fasern können die Papiereigenschaften wie zum Beispiel Festigkeit, Dehnfähigkeit oder Porosität der später gebildeten Bahn und auch die Entwässerungseigenschaften bei der Herstellung derselben gezielt beeinflusst werden.The paper machine preceded in the process flow is a stock preparation, in which the fiber suspension is treated in various apparatuses, before they then fed via the machine chest as temporary storage the headbox becomes. One type of apparatus for the mentioned treatment are refiner. In these, the fiber suspension is passed in the narrow gap between two discs which rotate relative to each other. The discs are provided with surface structures having ribs or edges. The aim of the treatment is, for example, to shorten the fibers or to fibrillate their surface by the shearing stress in the gap. By this treatment of the fibers, the paper properties such as strength, ductility or porosity of the later formed web and also the dewatering properties in the production thereof can be specifically influenced.

Eine Verbesserung der Papiereigenschaften kann weiterhin dadurch erreicht werden, wenn in einer der erfindungsgemäßen Maschine zugehörigen Stoffaufbereitung Hochkonsistenz-Refiner vorhanden sind, die den Papierstoff behandeln und zwar bei einer Feststoffkonzentration in der behandelten Suspension zwischen 25 und 40%. Auch dadurch wird die Festigkeit der später gebildeten Papierbahn erhöht. Nach dem Durchlaufen der Hochkonsistenz-Refiner kann die Stoffsuspension in Niedrigkonsistenz-Refinern bei einer Feststoffkonzentration zwischen 3 und 5% behandelt werden, bevor sie dann der Maschinenbütte zugeführt wird, aus der die Maschine versorgt wird. Ein Nachteil der Refiner-Behandlung, nämlich dass dadurch auch die Porosität der hergestellten Papierbahn verringert wird, wird vermieden durch die Pressenpartie mit nur einem einzigen Pressnip, die eine geringere Verdichtung verursacht als an herkömmlichen Papiermaschinen.An improvement in paper properties can furthermore be achieved if high-consistency refiners, which treat the paper stock at a solids concentration in the treated suspension of between 25 and 40%, are present in a stock preparation according to the invention. This also increases the strength of the paper web formed later. After passing through the high consistency refiners, the stock suspension may be treated in low consistency refiners at a solids concentration between 3 and 5% before being fed to the machine chest from which the machine is supplied. A disadvantage of the refining treatment, namely that it also reduces the porosity of the paper web produced is avoided by the press section with only a single press nip, which causes a lower compression than on conventional paper machines.

Ebenso kann es von Vorteil sein, wenn mindestens ein Stoffauflauf der erfindungsgemäßen Maschine mit Mitteln zur Verdünnungswasserregelung ausgerüstet ist, wie sie zum Beispiel aus EP 1236828 A1 bekannt sind. Bei dieser Ausgestaltung des Stoffauflaufs wird die Möglichkeit geschaffen, den Durchsatz, die Feststoffdichte und somit das Flächengewicht und die Faserorientierung sektional über der Breite in Zonen regeln zu können. Bei der Verdünnungswasserregelung wird das Querprofil des Flächengewichts der Papierbahn dadurch geregelt, dass an zu schweren Stellen im oder vor dem Stoffauflauf mehr Wasser in die entsprechende Zone zugeführt wird und somit die Stoffdichte in der Suspension in dieser Zone reduziert wird. Bei zu leichten Stellen ist es umgekehrt. Durch das somit verbesserte Flächengewichtsquerprofil der Papierbahn wird eine gleichmäßigere Porosität, Festigkeit und Dehnfähigkeit des Sackpapiers erreicht über der Breite der Papierbahn.It may also be advantageous if at least one headbox of the machine according to the invention is equipped with means for dilution water control, as for example EP 1236828 A1 are known. In this embodiment of the headbox, the possibility is provided to be able to regulate the throughput, the solids density and thus the basis weight and the fiber orientation in sections over the width in zones. In the case of dilution water control, the cross-section of the weight per unit area of the paper web is regulated by feeding more water into the corresponding zone at heavy points in or in front of the headbox, and thus the consistency in the suspension in this zone is reduced. If it's too light it's the other way around. Due to the thus improved basis weight cross profile of the paper web, a more uniform porosity, strength and extensibility of the sack paper is achieved over the width of the paper web.

Nachfolgend werden anhand von einem Ausführungsbeispiel vorteilhafte Merkmale der Erfindung erläutert unter Bezugnahme auf die Zeichnung.
Dabei zeigt die Fig.1 eine mögliche Ausführungsform der erfindungsgemäßen Maschine.Hereinafter, advantageous features of the invention will be explained with reference to the drawing with reference to an embodiment .
It shows the Fig.1 a possible embodiment of the machine according to the invention.

In Fig.1 wird eine Maschine zur Herstellung einlagigen Sackpapiers gezeigt. Über den Stoffauflauf (1) wird die Stoffsuspension gleichmäßig über der Breite auf dem Formiersieb verteilt. Die Siebpartie (2) ist hier als Langsiebpartie ausgeführt, d.h. die Suspension wird nur über ein Formiersieb zur Unterseite hin entwässert. Alternativ wäre auch ein Doppelsiebformer möglich, bei dem die Suspension zwischen zwei Formiersieb aufgebracht wird und zu beiden Seiten (Ober- und Unterseite) hin entwässert wird. Die gezeigte Siebpartie ist mit einer Siebschüttelvorrichtung (8) ausgestattet, welche das Sieb in Querrichtung schnell hinundher bewegt. Dadurch wird die Faserausrichtung und die Blattbildung positiv beeinflusst und eine höhere Festigkeit in der Papierbahn erreicht Die Pressenpartie (3) hat nur einen einzigen Schuhpressnip, der von einer Gegenwalze und einer Schuhpresswalze (9) gebildet wird. In der dargestellten Ausführung ist die Schuhpresswalze (9) oben und die Gegenwalze unten. Der Schuhpressnip ist doppelt befilzt mit einem endlos umlaufenden Oberfilz und einem endlos umlaufenden Unterfilz. Die Papierbahn wird durch eine Saugwalze vom Formiersieb abgenommen und auf den Oberfilz übertragen. Ebenso wird die Bahn nach der Pressenpartie durch eine Saugwalze, vom Unterfilz auf das Trockensieb der ersten Trockengruppe übertragen. Diese Ausführung der Pressenpartie gewährleistet eine optimale Entwässerungsleistung und eine gute Bahnführung mit geringem Abrissrisiko bei möglichst geringer Verdichtung der Sackpapierbahn, was die bevorzugten Papiereigenschaften ergibt.In Fig.1 a machine for producing single-ply sack paper is shown. Over the headbox (1), the stock suspension is distributed evenly across the width on the forming fabric. The wire section (2) is designed here as a wire screening section, ie the suspension is dewatered only through a forming fabric towards the bottom. Alternatively, a twin-wire former would also be possible in which the suspension is applied between two forming fabrics and is dewatered on both sides (top and bottom). The wire section shown is equipped with a Siebschüttelvorrichtung (8), which moves the screen in the transverse direction quickly back and forth. As a result, the fiber orientation and the sheet formation is positively influenced and a higher strength in the paper web reached The press section (3) has only a single shoe press nip, which is formed by a counter-roller and a shoe press roll (9). In the illustrated embodiment, the shoe press roll (9) is above and the counter roll below. The shoe press nip is double felted with an endless top felt and an endless underfelt. The paper web is removed by a suction roll from the forming fabric and transferred to the top felt. Likewise, the web is transferred after the press section by a suction roll, from the lower felt to the drying wire of the first drying group. This design of the press section ensures optimal drainage performance and good web guide with little risk of demolition with minimal compaction of the sack paper web, resulting in the preferred paper properties.

Die Trockenpartie (4A und 4B) besteht aus mehreren Trockengruppe, wobei die vorderen Trockengruppen in der beispielhaften Maschine einreihig und die weiter hinten angeordneten Trockengruppe zweireihig ausgeführt sind. Eine Trockengruppe ist dadurch gekennzeichnet, dass alle Zylinder und Walzen darin eine Antriebsgruppe bilden. Einreihige Trockengruppen bestehen aus einer Reihe beheizbarer Zylinder und einer Reihe Umlenkwalzen, die mit Vakuum beaufschlagbar sein können, wobei die Bahn zusammen mit einem endlos umlaufenden Trockensieb im Wechsel über die Zylinder und die Umlenkwalzen geführt wird. Zweireihige Trockengruppen weisen eine oberen und eine untere Reihe von beheizbaren Zylindern auf, über die die Bahn im Wechsel geführt wird. Ein oberes Trockensieb umschlingt nacheinander die Zylinder der oberen Reihe und ein unteres Trockensieb umschlingt nacheinander die Zylinder der unteren Reihe.The dryer section (FIGS. 4A and 4B) consists of a plurality of dryer groups, with the front dryer groups in the exemplary machine being single-row and the dryer group arranged further back in two rows. A drying group is characterized in that all cylinders and rollers form a drive group therein. Single-row dryer groups consist of a series of heatable cylinders and a number of guide rollers, which can be acted upon by vacuum, wherein the web is guided together with an endlessly circulating drying wire in alternation on the cylinders and the guide rollers. Double-row dryer groups have an upper and a lower row of heatable cylinders over which the web is alternately guided. An upper dryer wire successively wraps around the cylinders of the upper row and a lower dryer wire successively wraps around the cylinders of the lower row.

Innerhalb der Trockenpartie (4A und 4B ist in der dargestellten Ausführungsform eine Staucheinrichtung (5) vorgesehen. Sie ist als sogenannte Clupak-Einheit mit einem elastischen Band (10) ausgeführt ist. Nach der Trockenpartie folgt ein Glättwerk (6) mit einem Schuhglättnip, der von einer beheizbaren Glättwalze in unterer Position und einer Schuhglättwalze (11) in oberer Position gebildet wird. Das Glättwerk sorgt für die verbesserte Bedruckbarkeit, in dem es die Glätte besonders der Unterseite erhöht. Die Sackpapierbahn (12) wird dann in der abschließenden Aufrolleinheit (7) aufgewickelt.4A and 4B, an upsetting device 5 is provided in the illustrated embodiment, which is embodied as a so-called Clupak unit with an elastic band 10. After the drying section, a calender 6 follows with a shoe-smoothing nipple The calender provides improved printability by increasing the smoothness, particularly of the underside, The sack paper web (12) is then placed in the final roll-up unit (7 ) wound up.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Stoffauflaufheadbox
22
SiebpartieWire section
33
Pressenpartie mit SchuhpressnipPress section with shoe press nip
4A4A
Teil der TrockenpartiePart of the dryer section
4B4B
Weiterer Teil der TrockenpartieAnother part of the dryer section
55
Staucheinrichtungupsetting device
66
Glättwerk mit SchuhglättnipGlättwerk with Schuhglattnip
77
Aufrolleinheitup Reel
88th
Siebschüttelvorrichtungsieve shaker
99
SchuhpresswalzeShoe press roll
1010
elastisches Bandelastic band
1111
SchuhglättwalzeSchuhglättwalze
1212
SackpapierbahnSack paper web

Claims (14)

  1. Machine for producing a compressed or uncompressed sack paper web (12), which has a headbox (1), a wire section (2), a press section (3), a drying section (4A and 4B) and a reel-up unit (7),
    characterized in that
    the press section (3) comprises only a single press nip, which is implemented as a shoe press nip that is formed by a mating roll and a shoe press roll (9), and the length of the shoe press nip in the web running direction is at least 220 mm, preferably at least 270 mm.
  2. Machine according to Claim 1,
    characterized in that
    there is a smoothing unit (6) and this includes only a single smoothing nip.
  3. Machine according to Claim 1 or 2,
    characterized in that
    the press nip in the press section (3) is double-felted, the paper web being guided through the press nip between top felt and bottom felt.
  4. Machine according to one of the preceding claims,
    characterized in that
    the smoothing unit (6) is implemented as a shoe smoothing unit having an extended smoothing nip, which is formed by a heatable smoothing roll and a shoe smoothing roll (11).
  5. Machine according to one of the preceding claims,
    characterized in that
    a heatable smoothing roll is provided in a smoothing unit (6) and in that this is the bottom roll in the smoothing unit.
  6. Machine according to one of the preceding claims,
    characterized in that
    there is a compressing device (5) within the drying section, in which device the paper web is compressed counter to the running direction at a dryness between 60% and 80%.
  7. Machine according to one of the preceding claims,
    characterized in that
    in the wire section (2) there is a wire shake apparatus (8), which moves a forming fabric to and fro substantially transversely with respect to the running direction.
  8. Machine according to one of the preceding claims,
    characterized in that
    in a stock preparation system belonging to the machine, which is located upstream of the headbox (1) of the machine in the process sequence, there are high-consistency refiners, which treat the paper stock, specifically at a solids concentration between 25% and 40%.
  9. Machine according to one of the preceding claims,
    characterized in that
    at least one headbox (1) is equipped with dilution water control.
  10. Method for producing a compressed or uncompressed sack paper web (12) by using a machine which has a headbox (1), a wire section (2), a press section (3), a drying section (4A and 4B) and a reel-up unit (7),
    characterized in that
    the paper web is pressed in a press section (3) which comprises only a single press nip, which is implemented as a shoe press nip that is formed by a mating roll and a shoe press roll (9), and the length of the shoe press nip in the web running direction is at least 220 mm, preferably at least 270 mm.
  11. Method according to Claim 10,
    characterized in that
    the paper web is led through a smoothing unit (6) and the latter includes only a single smoothing nip.
  12. Method according to either of Claims 10 and 11,
    characterized in that
    the paper web is led though the smoothing unit (6), which is implemented as a shoe smoothing unit having an extended smoothing nip that is formed by a heatable smoothing roll and a shoe smoothing roll (11).
  13. Method according to one of Claims 10 to 12,
    characterized in that
    the paper web is dewatered in the wire section (2), and in the latter there is a wire shake apparatus (8), which moves a forming fabric to and fro substantially transversely with respect to the running direction.
  14. Use of a machine for producing a compressed or uncompressed sack paper web (12), which has a headbox (1), a wire section (2), a press section (3), a drying section (4A and 4B) and a reel-up unit (7),
    characterized in that
    the press section (3) comprises only a single press nip, which is implemented as a shoe press nip that is formed by a mating roll and a shoe press roll (9), and the length of the shoe press nip in the web running direction is at least 220 mm, preferably at least 270 mm.
EP11722392.5A 2010-06-01 2011-05-25 Machine, method and use of the machine for producing a paper web, in particular a sack paper web Active EP2576895B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010029580 DE102010029580A1 (en) 2010-06-01 2010-06-01 Machine for producing a paper web, in particular a sack paper web
PCT/EP2011/058557 WO2011151239A2 (en) 2010-06-01 2011-05-25 Machine for producing a paper web, in particular a sack paper web

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Publication number Publication date
CN103097608A (en) 2013-05-08
DE102010029580A1 (en) 2011-12-01
CN103097608B (en) 2016-05-11
EP2576895A2 (en) 2013-04-10
WO2011151239A3 (en) 2012-01-26
WO2011151239A2 (en) 2011-12-08

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