EP2576895A2 - Machine pour produire une bande de papier, en particulier une bande de papier pour sac - Google Patents

Machine pour produire une bande de papier, en particulier une bande de papier pour sac

Info

Publication number
EP2576895A2
EP2576895A2 EP11722392.5A EP11722392A EP2576895A2 EP 2576895 A2 EP2576895 A2 EP 2576895A2 EP 11722392 A EP11722392 A EP 11722392A EP 2576895 A2 EP2576895 A2 EP 2576895A2
Authority
EP
European Patent Office
Prior art keywords
press
section
machine according
paper web
nip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP11722392.5A
Other languages
German (de)
English (en)
Other versions
EP2576895B1 (fr
Inventor
Georg Bacovsky
Wolfgang Schwarz
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2576895A2 publication Critical patent/EP2576895A2/fr
Application granted granted Critical
Publication of EP2576895B1 publication Critical patent/EP2576895B1/fr
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
    • 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, which comprises a headbox, a wire section, a press section, a dryer section and a take-up unit.
  • 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 stacked on top of each other.
  • 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 shoe-smoothing roller has a flexible sheath, which can be fixed on a 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. As a result, the filling properties of the bag are nevertheless worsened compared to the conventional quality. With known machines, therefore, a compromise between improved printability and good filling properties will always be required.
  • the object of the invention is to further develop a machine for the production of sack paper, which achieves an improved printability of the sack paper, without the use or filling properties being impaired.
  • the smoothness of the sack paper web should be increased without the porosity being reduced too much.
  • the press section consists of only a single press nip, which is designed as a shoe press nip, which is formed by a counter-roller and a shoe press roll.
  • the porosity is measured, for example, as the Gurley value (ISO 5636-5, TAPP I T460). It measures the time required for a given pressure to push a 100ml air volume through the paper. The smaller the value, the more porous and air permeable the paper is.
  • Gurley values of less than 7 s / 100 ml, in particular less than or equal to 5 s / 100 ml or even less than or equal to 3 s / 100 ml, are achieved with the machine according to the invention in the sack paper produced.
  • 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 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 just 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 sequence is a stock preparation, in which the fiber suspension is treated in various apparatus before it then fed to the headbox via the machine chest as intermediate storage. leads.
  • 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 are known for example from EP 1236828 A1.
  • 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.
  • the wire section (2) is designed here as a wire drawing section, i. the suspension is only dewatered to the bottom via a forming fabric.
  • a twin-wire former would also be possible in which the suspension is applied between two forming fabrics and dewatered on both sides (top and bottom).
  • the wire section shown is equipped with a sieve shaker
  • 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 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.
  • 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.
  • 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 designed as a so-called Clupak unit with an elastic band 110.
  • a calender 6 follows with a shoe-smoothing nipple. formed by a heatable smoothing roller in a lower position and a shoe-smoothing roller (11) in an upper position
  • the smoothing unit provides improved printability by increasing the smoothness, particularly of the underside (7) wound up.

Landscapes

  • Paper (AREA)

Abstract

L'invention concerne une machine pour produire une bande de papier pour sac (12) comprimée ou non comprimée qui comporte une caisse de tête (1), une partie toile (2), une section des presses (3), une partie sèche (4A et 4B) et une unité d'enroulage (7), la section des presses (3) étant constituée d'une seule ligne de contact se présentant sous la forme d'une ligne de contact à coussinet formée d'un contre-rouleau et d'un rouleau de presse à coussinet (9).
EP11722392.5A 2010-06-01 2011-05-25 Machine, procede et application d'une machine pour produire une bande de papier, en particulier une bande de papier pour sac Active EP2576895B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010029580 DE102010029580A1 (de) 2010-06-01 2010-06-01 Maschine zur Herstellung einer Papierbahn insbesondere Sackpapierbahn
PCT/EP2011/058557 WO2011151239A2 (fr) 2010-06-01 2011-05-25 Machine pour produire une bande de papier, en particulier une bande de papier pour sac

Publications (2)

Publication Number Publication Date
EP2576895A2 true EP2576895A2 (fr) 2013-04-10
EP2576895B1 EP2576895B1 (fr) 2014-10-01

Family

ID=44119246

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11722392.5A Active EP2576895B1 (fr) 2010-06-01 2011-05-25 Machine, procede et application d'une machine pour produire une bande de papier, en particulier une bande de papier pour sac

Country Status (4)

Country Link
EP (1) EP2576895B1 (fr)
CN (1) CN103097608B (fr)
DE (1) DE102010029580A1 (fr)
WO (1) WO2011151239A2 (fr)

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Publication number Priority date Publication date Assignee Title
DE102012218679A1 (de) * 2012-10-12 2014-04-17 Storopack Hans Reichenecker Gmbh Vorrichtung zur Herstellung eines Polsters aus Papier
RS55155B1 (sr) * 2014-07-04 2017-01-31 Billerudkorsnaes Ab Prevučeni papir za izradu vreća
CN107073865B (zh) * 2014-11-28 2020-10-20 福伊特专利有限公司 用于制造包装纸的方法和设备
EP3088606A1 (fr) * 2015-04-29 2016-11-02 BillerudKorsnäs AB Papier d'ensachage brun désintégrable
DE102015223664A1 (de) * 2015-11-30 2017-06-01 Voith Patent Gmbh Vorrichtung und verfahren zur herstellung einer faserstoffbahn
DE102015223663A1 (de) * 2015-11-30 2017-06-01 Voith Patent Gmbh Vorrichtung zur herstellung einer faserstoffbahn
PL3385442T3 (pl) 2017-04-06 2019-12-31 Billerudkorsnäs Ab Sposób wytwarzania papieru o dużej rozciągliwości
CN106988150B (zh) * 2017-05-23 2019-06-25 东莞市白天鹅纸业有限公司 一种生活用纸造纸机
DE102018119686A1 (de) * 2018-08-14 2020-02-20 Voith Patent Gmbh Papiermaschine
ES2875920T3 (es) * 2018-10-05 2021-11-11 Billerudkorsnaes Ab Método de producción de papel kraft o papel de bolsa
DE102019134177A1 (de) * 2019-12-12 2021-06-17 Voith Patent Gmbh Maschine und Verfahren zur Herstellung einer Faserstoffbahn
EP4400647A1 (fr) * 2023-01-16 2024-07-17 Billerud Aktiebolag (publ) Papier extensible

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US3327952A (en) * 1964-08-01 1967-06-27 West Virginia Pulp & Paper Co Method for the preparation of fibrous materials for the production of paper and cardboard
AU6957598A (en) * 1997-05-28 1998-12-30 Beloit Technologies, Inc. An extended nip press section apparatus
DE19926805A1 (de) * 1999-06-12 2000-12-14 Voith Sulzer Papiertech Patent Stoffauflauf mit Fluidzudosierung
DE29924920U1 (de) * 1999-11-16 2006-08-31 Voith Paper Patent Gmbh Pressenanordnung
DE10106684A1 (de) 2001-02-14 2002-08-29 Voith Paper Patent Gmbh Lamelle eines Stoffauflaufs einer Papier-, Karton- oder Tissuemaschine
AT500751B8 (de) * 2003-02-20 2007-02-15 Bartelmuss Klaus Ing Vorrichtung zur behandlung, insbesondere zur unterdruck-beaufschlagung, des in einer anlage zur papiererzeugung vorgesehenen, im umlauf bewegten mindestens einen siebbandes bzw. filzbandes
DE102004036276A1 (de) * 2004-07-27 2006-02-16 Voith Paper Patent Gmbh Verfahren und Vorrichtung zum Aufbringen eines Auftragmediums in einer Maschine zur Herstellung einer Faserstoffbahn
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Also Published As

Publication number Publication date
WO2011151239A2 (fr) 2011-12-08
EP2576895B1 (fr) 2014-10-01
CN103097608A (zh) 2013-05-08
CN103097608B (zh) 2016-05-11
WO2011151239A3 (fr) 2012-01-26
DE102010029580A1 (de) 2011-12-01

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