EP3919677A1 - Procédé et dispositif de fabrication d'une bande de matière fibreuse structurée - Google Patents

Procédé et dispositif de fabrication d'une bande de matière fibreuse structurée Download PDF

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Publication number
EP3919677A1
EP3919677A1 EP21173514.7A EP21173514A EP3919677A1 EP 3919677 A1 EP3919677 A1 EP 3919677A1 EP 21173514 A EP21173514 A EP 21173514A EP 3919677 A1 EP3919677 A1 EP 3919677A1
Authority
EP
European Patent Office
Prior art keywords
belt
fibrous web
dewatering
press
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.)
Withdrawn
Application number
EP21173514.7A
Other languages
German (de)
English (en)
Inventor
Jonas BERGSTRÖM
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 EP3919677A1 publication Critical patent/EP3919677A1/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • 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
    • 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
    • D21F3/0227—Belts or sleeves therefor
    • 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
    • D21F3/029—Wet presses using special water-receiving belts
    • 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
    • D21F9/00—Complete machines for making continuous webs of paper

Definitions

  • the invention relates to a method for producing a structured fibrous web, in particular a structured tissue web, comprising the following steps: Forming the fibrous web from a fibrous suspension, the fibrous suspension being introduced through a headbox between an outer dewatering belt and an inner dewatering belt and the outer dewatering belt and the inner
  • the dewatering belt partially wraps around a forming roller and transports the fibrous web lying on the inner dewatering belt to a transfer area.
  • the fibrous web is transferred to a belt in the transfer area and then the fibrous web is passed together with the belt through a press nip and transferred to an embossing belt which is also guided through the press nip and has a structure for structuring the fibrous web.
  • the fibrous web together with the embossing belt is guided through a transfer nip to transfer the fibrous web for drying to a heated metallic surface, in particular to the surface of a drying cylinder.
  • the invention also relates to a machine for producing a fibrous web, in particular a tissue web,
  • the fibrous web is formed in the forming area between an outer dewatering screen and an inner felt belt, both belts partially wrapping around a forming roll.
  • the felt belt transports the fibrous web to a drainage nip, in which the fibrous web is drained and transferred to an endless, smooth, impermeable belt with a polyurethane coating.
  • This smooth belt leads the fibrous web to a first transfer nip.
  • the fibrous web is removed from the smooth belt by an embossing belt and guided to another transfer nip and transferred to the surface of a Yankee cylinder.
  • the decrease in the The fibrous web from the smooth belt is made in the first transfer nip by applying a speed difference between the smooth belt and the structured embossing belt, the smooth belt running faster than the embossing belt.
  • the object of the invention is to improve the known methods and devices with regard to the quality of the fibrous web produced, the runability of the machine, the operating costs and the increase in maximum speed.
  • This solution according to the invention improves the web guidance and runability, so that the production speed can be increased.
  • the speeds of the inner dewatering belt and of the water-absorbing belt in the transfer area, which lies within the common looping area, are essentially the same.
  • the transfer takes place without a speed difference.
  • This also applies accordingly to the transfer of the fibrous web from the water-absorbing belt to the embossing belt in the embossing nip of the dewatering press. This results in both better runability and protection of the clothing due to less wear.
  • the fibrous web is given a structure corresponding to the configuration of the surface of the embossing belt facing the fibrous web.
  • the water-absorbing tape is guided in direct contact over the suction element which has a suction zone and which can be designed as a suction roll. Due to the negative pressure applied in the suction zone, the water contained in the water-absorbing tape and part of the water contained in the fibrous web are sucked off and removed. In this way, the water-absorbing tape is conditioned and the dry content of the fibrous web is increased even before the embossing nip. As a result, the water-absorbing tape in the press nip of the dewatering press can completely absorb the water that occurs. As a result, a higher dry content of the fibrous web is achieved before the transfer nip and before the transfer to the metallic heated surface.
  • a suction cup can also be used within the loop formed water-absorbing tape to increase drainage.
  • the higher dry content of the fibrous web before the embossing nip also favors the embossing behavior and, on the other hand, the resilience of the fibrous web is higher and therefore better.
  • the water-absorbing band is designed as a press felt. Due to the softness of the press felt, a very good and sustainable surface structure can be introduced into the fibrous web and thus have a positive effect on the quality of the structured fibrous web. In addition, the press felt efficiently absorbs the water squeezed out in the embossing nip,
  • the inner dewatering belt for structuring the fibrous web is designed to be structured.
  • the fiber suspension brought into the forming zone through the headbox comes into contact with the structured inner dewatering belt at the beginning of the forming process.
  • the dewatering of the fiber suspension results in a very stable and permanent surface structure of the fiber web.
  • the fibrous web is structured with two superimposed structural patterns.
  • the inner drainage band is preferably made permeable. So it is permeable to water and air.
  • the inner drainage belt is designed as a woven structured belt or as an embossing felt or as a monolithic membrane with openings or bores or as a perforated, multi-layer laminated film for structuring the fibrous web.
  • the structure of the inner drainage belt can differ from the structure of the embossing belt.
  • the structures can also be the same.
  • Surface structures of fibrous webs, in particular of tissue webs, and embossing belts for producing such surface structures are known.
  • the structures of the embossing belts include elevations and depressions which are spaced apart from one another and have dimensions perpendicular to the surface of the fibrous web. The larger the distances and / or dimensions, the coarser the structure and vice versa. The smaller the distances and / or the dimensions, the finer the structure.
  • the elements of the structures can also be arranged in certain patterns, for example diagonally.
  • the elements of the structures can have certain spatial shapes, such as cylindrical, cuboid, pyramidal, linear, elongated shapes, etc., for example. It is known that there are also woven, structuring coverings, such as TAD screens, for example. Embossing felts are felt bands on the surface of which structures made of plastic are applied for embossing one side of the fibrous web. These embossing belts can in principle be used for the invention both as an embossing belt and as an inner drainage belt.
  • Structuring strips made of monolithic membranes have openings or bores that are mechanically, for example punched, drilled or produced with laser beams or water jets.
  • the structuring elements are the openings or bores into which areas of the fibrous web are pressed during the structuring process.
  • Perforated, multi-layer laminated foils for structuring the fibrous web are constructed in a similar manner. However, they have several layers that perform different functions, such as generating tensile strength.
  • These embossing tapes are preferably permeable to air and water. Topographical contours can be superimposed on the surfaces of this type of structuring strips with openings or bores in order to achieve an additional structuring effect.
  • These embossing belts can in principle be used for the invention both as an embossing belt and as an inner drainage belt.
  • the structure of the inner drainage belt can be made finer than the structure of the embossing belt.
  • the so-called hairiness can be reduced and the drying temperature can be increased as a result.
  • hairiness is understood as the protrusion of fine fibers from the fiber surface. When drying on the drying cylinder, these fibers can burn and cause an odor. In addition, the drying temperatures must be reduced.
  • the common looping area is designed with a length in the circumferential direction of the suction element of more than 80 mm, in particular more than 150 mm, preferably more than 280 mm. On the one hand, this ensures a safe transfer of the fibrous web to the water-absorbing tape.
  • the inner dewatering belt is preferably removed from the suction element or from the suction roll earlier than the water-absorbing belt.
  • steam or hot, dry or moist air can be supplied from the inside of the loop formed by the inner dewatering belt in the common looping area. This can be done, for example, by arranging a steam blower box or a hot air hood opposite the wraparound area. The heating can also take place after the removal from the inner dewatering belt.
  • the press nip is preferably designed as an extended press nip.
  • the press nip is not only used for drainage, but also provides the The long dwell time in the extended press nip ensures good structuring and, at the same time, gentle, adequate drainage.
  • the extended press nip is formed by a shoe roll and a counter roll, which is designed in particular as a suction press roll.
  • the embossing belt is designed as a monolithic membrane or as a perforated, multi-layer laminated film. These have openings or bores that are mechanically, for example punched, drilled or generated with laser beams or water jets.
  • the structuring elements are the openings or bores into which areas of the fibrous web are pressed during the structuring process. The land areas between the openings or bores are impermeable. This causes a higher dewatering in interaction with the negative pressure acting in the suction press roll, with a constant line force of the shoe roll.
  • the counter roller is arranged within the loop formed by the water-absorbing tape and the shoe roller is arranged within the loop formed by the embossing tape.
  • the shoe roll comprises a press shoe and a press cover.
  • the press jacket preferably has grooves on its outer surface. These allow air to flow in during the pressing in the press nip, especially if the counter-element is designed as a suction press roll.
  • the fibrous web is pressed in the extended press nip preferably with a line force of less than 300 kN / m, in particular less than 200 kN / m, preferably in the range between 100 kN / m to 300 kN / m.
  • embossing band can be made permeable.
  • the embossing band used is preferably a band made from a perforated monolithic membrane or a band made from a perforated, multi-layer laminated film.
  • a structured, woven screen can also be used as the embossing belt.
  • the transfer nip is formed by a transfer roller lying in the loop formed by the embossing belt and the heated metallic surface.
  • the transfer roller can be designed with a circumferential surface that is grooved on the outside. The grooves facilitate the transfer of the fibrous web to the heated, metallic surface.
  • the heated, metallic surface can be the surface of a counterpart transfer element which, together with the transfer roller, forms the transfer nip.
  • the counter transfer element can be, for example, a drying cylinder, a Yankee cylinder or a heated metal belt.
  • cleaning and conditioning devices are assigned to the structuring belts.
  • This can be, for example, the use of water jets, high pressure nozzles, vacuum suction devices, flushed inlet nips on guide rollers for the structuring belts.
  • the inner dewatering belt is advantageously designed to structure the fibrous web.
  • the construction of the machine enables a short distance between the embossing nip of the dewatering press and the transfer nip.
  • the distance between the end of the embossing nip and the start of the transfer nip is less than 8 m, in particular less than 7 m, preferably less than 6 m.
  • the single figure shows a possible embodiment of a machine 23 according to the invention for producing a structured tissue web 21 in a schematic representation.
  • the tissue web 21 is formed in a forming area 22 from a pulp suspension which is introduced through a headbox 1 between an outer dewatering belt 2 and an inner dewatering belt 3.
  • the outer dewatering belt 2 and the inner dewatering belt 3 partially wrap around a forming roller 4.
  • the outer dewatering belt 2 and the inner dewatering belt 3 and also the other coverings 9, 15 are guided around guide rollers 5 and thereby form a respective loop.
  • the outer dewatering belt 2 is led away from the fibrous web 21 and the inner dewatering belt 3.
  • the fibrous web 21 is transported lying on the inner dewatering belt 3 to a transfer area 8.
  • the outer dewatering belt 2 is designed as a woven dewatering screen and the inner dewatering belt 3 is designed as a woven, structured dewatering screen for structuring the tissue web 21.
  • Both drainage belts 2, 3 are designed to be permeable to water.
  • the tissue web 21 is transferred from the inner dewatering belt 3 to a belt 9, which in this example is designed as a water-absorbing belt, in particular as a press felt.
  • the transfer area 8 is formed by a suction element 6, located in the loop formed by the water-absorbing belt 9, designed as a suction roller 6, which is partially wrapped by the inner drainage belt 3 and the water-absorbing belt 9 in a common looping area.
  • the suction roll 6 has a suction zone 7 which extends over a length in the circumferential direction of the suction roller 6 which is greater than the common wraparound area.
  • the length of the common looping area in the circumferential direction of the suction roll 6 is more than 280 mm in this example.
  • the inner dewatering belt 3 is guided away from the tissue web 21 and the water-absorbing belt 9 from the suction roll 6 before the end of the suction zone 7.
  • the band 9 together with the tissue web 21 is guided around the suction roll 6 in a further looping area and finally guided to and through a press nip 16 of a dewatering press 10 and there to a tissue web 21 which is also guided through the press nip 16 and has a structure for structuring Embossing band 15 handed over.
  • the tissue web 21 is dewatered in the press nip 16, which also represents an embossing nip 16, and structured for the second time by the structure of the embossing belt 15.
  • the structure of the embossing belt 15 is coarser than the structure of the internal drainage belt 3.
  • tissue web 21 together with the embossing belt 15 is passed through a transfer nip 18, which is formed by a transfer roller 17 and a Yankee cylinder 19, for transferring the tissue web 21 for further drying to a Yankee cylinder 19, in particular to a Yankee cylinder 19 made of steel with a heated metallic surface.
  • a transfer nip 18 is formed by a transfer roller 17 and a Yankee cylinder 19, for transferring the tissue web 21 for further drying to a Yankee cylinder 19, in particular to a Yankee cylinder 19 made of steel with a heated metallic surface.
  • the tissue web 21 is removed by a doctor 20 and, if necessary, creped in the process.
  • the water-absorbing tape 9 is guided in the transfer area 8 in direct contact with a suction roller 6 having a suction zone 7.
  • the water contained in the water-absorbing tape 9 and part of the water contained in the tissue web 21 are sucked off and removed.
  • the water-absorbing band 9 is conditioned and the dry content of the tissue web 21 is increased even before the embossing nip.
  • this can water-absorbing belt 9 in the press nip of the dewatering press 10 completely absorb the water.
  • a higher dry content of the tissue web 21 before the transfer nip 18 and before the transfer to the Yankee cylinder 19 is achieved. Since mechanical dewatering is more energetic than thermal drying using the Yankee cylinder, it can save energy.
  • the press nip 16 is designed as an extended press nip.
  • the press nip 16 is not only used for dewatering, but also represents the embossing nip.
  • the long dwell time in the extended press nip 16 ensures good structuring and, at the same time, gentle, adequate dewatering.
  • the extended press nip of the dewatering press 10 is formed by a shoe roll 11 and a counter roll 13, which is designed in particular as a suction press roll.
  • the counter roller 13 is arranged within the loop formed by the water-absorbing band 9 and the shoe roller 11 is arranged within the loop formed by the embossing band 15.
  • the shoe roll 11 comprises a press shoe 12 and a press cover.
  • the press jacket preferably has grooves on its outer surface. These allow air to flow in during the pressing in the press nip 16, in particular if the counter-element is designed as a suction press roll.
  • the embossing band 15 is designed as a monolithic membrane or as a perforated, multi-layer laminated film. These have openings or bores that have been mechanically, for example punched, drilled or generated with laser beams or water jets.
  • the structuring elements are the openings or bores into which areas of the fibrous web are pressed during the structuring process. The land areas between the openings or bores are impermeable. This causes a higher dewatering especially in cooperation with the negative pressure acting in the suction press roll, with constant line force of the shoe roll.
  • the tissue web 21 is in the extended press nip with a line force of less than 300 kN / m, pressed.
  • the construction of the machine 23 enables a short distance between the embossing nip 16 of the dewatering press 10 and the transfer nip 18.
  • the distance between the end of the embossing nip 16 and the beginning of the transfer nip 18 is less than 8 m.
EP21173514.7A 2020-06-03 2021-05-12 Procédé et dispositif de fabrication d'une bande de matière fibreuse structurée Withdrawn EP3919677A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020114686.8A DE102020114686A1 (de) 2020-06-03 2020-06-03 Verfahren und Vorrichtung zur Herstellung einer strukturierten Faserstoffbahn

Publications (1)

Publication Number Publication Date
EP3919677A1 true EP3919677A1 (fr) 2021-12-08

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Application Number Title Priority Date Filing Date
EP21173514.7A Withdrawn EP3919677A1 (fr) 2020-06-03 2021-05-12 Procédé et dispositif de fabrication d'une bande de matière fibreuse structurée

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EP (1) EP3919677A1 (fr)
CN (1) CN113756125A (fr)
DE (1) DE102020114686A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021121504A1 (de) 2021-08-19 2023-02-23 Voith Patent Gmbh Maschine und Verfahren zur Herstellung einer Tissuebahn

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008051150A1 (fr) * 2006-10-27 2008-05-02 Metso Paper Karlstad Ab Appareil à courroie de transfert imperméable dans une machine à papier, et procédés associés
DE69839081T2 (de) * 1997-12-17 2009-01-22 Metso Paper Karlstad Ab Papiermaschine, papiermaschinenbespannung für , und verfahren zur herstellung von bemustertem weichen papier
WO2013009256A1 (fr) 2011-07-12 2013-01-17 Metso Paper Karlstad Ab Procédé et machine permettant de produire une nappe fibreuse structurée en papier
WO2019201861A1 (fr) * 2018-04-19 2019-10-24 Valmet Aktiebolag Procédé et machine de production d'une bande de tissu

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE511736C2 (sv) 1998-03-20 1999-11-15 Nordiskafilt Ab Albany Präglingsband för en pappersmaskin

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69839081T2 (de) * 1997-12-17 2009-01-22 Metso Paper Karlstad Ab Papiermaschine, papiermaschinenbespannung für , und verfahren zur herstellung von bemustertem weichen papier
WO2008051150A1 (fr) * 2006-10-27 2008-05-02 Metso Paper Karlstad Ab Appareil à courroie de transfert imperméable dans une machine à papier, et procédés associés
WO2013009256A1 (fr) 2011-07-12 2013-01-17 Metso Paper Karlstad Ab Procédé et machine permettant de produire une nappe fibreuse structurée en papier
WO2019201861A1 (fr) * 2018-04-19 2019-10-24 Valmet Aktiebolag Procédé et machine de production d'une bande de tissu

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Publication number Publication date
DE102020114686A1 (de) 2021-12-09
CN113756125A (zh) 2021-12-07

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