EP1816256B1 - Machine et procédé pour la fabrication d'une bande fibreuse - Google Patents

Machine et procédé pour la fabrication d'une bande fibreuse Download PDF

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Publication number
EP1816256B1
EP1816256B1 EP07106782A EP07106782A EP1816256B1 EP 1816256 B1 EP1816256 B1 EP 1816256B1 EP 07106782 A EP07106782 A EP 07106782A EP 07106782 A EP07106782 A EP 07106782A EP 1816256 B1 EP1816256 B1 EP 1816256B1
Authority
EP
European Patent Office
Prior art keywords
press
fibrous web
web
shoe
approximately
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP07106782A
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German (de)
English (en)
Other versions
EP1816256A1 (fr
Inventor
Thomas Scherb
Harald Schmidt-Hebbel
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
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Voith Patent GmbH
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Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1816256A1 publication Critical patent/EP1816256A1/fr
Application granted granted Critical
Publication of EP1816256B1 publication Critical patent/EP1816256B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • D21F3/0281—Wet presses in combination with a dryer roll

Definitions

  • the invention relates to a machine for producing a fibrous web, in particular tissue or tissue paper web, with at least one press nip formed between a shoe press unit and a dryer or tissue cylinder, through which a water-absorbing carrier tape, a water-impermeable press belt and the fibrous web are passed. It further relates to a method for producing a fibrous web.
  • the main press as viewed in the direction of web travel, comprises a drying cylinder and an associated pressing element.
  • a pressing element may be provided a suction press roll or a shoe press roll.
  • the rear main press is formed by a shoe press unit and a drying cylinder.
  • a method of hot pressing and drying a fibrous web which comprises a first step in which the fibrous web is subjected to a relatively long pressing time at a relatively low pressing pressure (first nip), a second step in which the pressing pressure is lowered significantly, and a third step in which a rapid increase in pressure is carried out.
  • first nip relatively low pressing pressure
  • second step in which the pressing pressure is lowered significantly
  • third step in which a rapid increase in pressure is carried out.
  • two press nip passages with different lengths and pressing forces are thus provided.
  • the aim of the invention is to provide a machine and a method of the type mentioned, with which the highest possible dry content and / or specific volume can be achieved while avoiding the disadvantages mentioned above and while largely adhering to the quality characteristics required for the produced web.
  • the residence time of the web in an extended press nip is less than 12 ms.
  • this object is achieved according to the invention by providing at least one press nip formed between a shoe press unit and the dryer or tissue cylinder whose length considered in the web running direction is greater than a value of about 80 mm and preferably less than 200 mm, in particular at most 150 mm, so that the fibrous web to be dewatered is subjected to a pressing pressure in the press nip (12) for a period of at least 3.5 ms and its pressure profile resulting from the press nip length has a maximum compacting pressure which is less than or equal to a value of is about 2 MPa, wherein the carrier tape and the fibrous web are guided in the web running direction in front of the drying cylinder via at least one suction device.
  • the specific volume is also slightly increased. Such an increase may be for example about 5%.
  • dry content which is particularly true in comparison to a press nip, which is formed by means of a suction press roll or by a shoe press with a gap length of, for example, 120 mm.
  • an increase in dry content of about 2.5 to 3% is possible, assuming a constant line force of about 90 kN / m.
  • a constant line force of about 90 kN / m Such a value must not be exceeded in the usual Yankee cylinders in view of a maximum allowable mechanical stress.
  • the invention can therefore be used with particular advantage especially in conversions of existing presses.
  • dry content increases as well as constant or higher values of the specific volume (bulk) can be achieved in comparison to conventional presses.
  • the residence time of the fibrous web in the press nip is in particular greater than or equal to 4 ms.
  • the residence time can be defined in particular by the ratio of gap or shoe length to the web speed.
  • the maximum line force generated by the press nip may be in the range of about 90 to about 120 kN / m.
  • the shoe press unit comprises a press shoe, which can be pressed against the drying cylinder via a plurality of contact elements arranged side by side transversely to the web running direction.
  • a respective desired pressing force transverse profile can be adjusted to even out the web properties, in particular at the web edges.
  • a creping cylinder i. a so-called Yankee cylinder may be provided.
  • the pressure profile resulting over the press nip length is preferably asymmetrical.
  • the maximum pressing pressure is preferably in the rear quarter of the press nip length viewed in the web running direction.
  • the average pressure rise gradient in the section of the pressure profile reaching from the gap beginning to the maximum pressing pressure at a new carrier strip is greater than or equal to a value of about 40 kPa / mm, in particular greater than or equal to about 60 kPa / mm and preferably greater or equal to about 120 kPa / mm.
  • the mean pressure drop gradient in the end region of the pressure profile is preferably greater than or equal to a value of about 300 kPa / mm, in particular greater than or equal to about 500 kPa / mm, and preferably greater than or equal to about 800 kPa / mm in a new carrier tape.
  • the mean pressure drop gradient in the end region increases with increasing operating time of the felt. As a result, values of more than 1000 to more than 1600 kPa / m are achieved in a press nip according to the invention.
  • the water-absorbing carrier tape lies in the press nip between the water-impermeable press belt and the fibrous web, the fibrous web contacting the drying cylinder.
  • a water-absorbing carrier tape may be provided in particular a felt.
  • a felt may, for example, have a basis weight which is less than or equal to a value of about 1450 g / m 2 .
  • It is, for example, a specially structured felt in the manner of a bumped embossing screen or felt, ie a so-called “imprinting fabric” or “imprinting felt” (see, for example, US Pat WO98 / 00604 ) or a roughly textured surface having "patterning fabric” or “patterning felt” usable.
  • the special carrier tapes in particular in combination with a press nip according to the invention having a press nip length greater than or equal to about 80 mm, have an advantageous effect on the specific volume of the paper web produced.
  • the water-absorbing carrier tape may have a different texture in the thickness direction.
  • the fibrous web facing side of the carrier tape for example, have a finer structure than its side facing away from the fibrous web page.
  • the press belt has a grooved and / or provided with blind holes surface, as for example in the DE-A-196 54 198 is described.
  • a further press nip can also be formed on the drying cylinder. It may be useful in certain applications, if at least two press gaps formed by a respective shoe press unit are provided on the drying cylinder. In principle, it is also conceivable to provide an additional press nip in the web running direction in front of the drying cylinder.
  • the at least one suction device or suction box may be provided which comprises a suction roll and / or a suction shoe.
  • a shoe press roll is provided as the shoe press unit.
  • the shoe press unit comprises at least one exchangeable press shoe.
  • the method according to the invention is characterized in that the fibrous web to be dewatered is subjected to a pressing pressure of at most 2 MPa for a period of at least 3.5 ms in the press nip whose length (L) considered in the web erection is greater than a value of about 80 mm is.
  • the invention is applicable to, for example, a crescent former, a four-wire tissue paper machine, a twin-wire former, a suction breast roll machine, etc.
  • the substance input for the production of, for example, a tissue web can consist, for example, of "refined pulp".
  • the inventive press nip can be used particularly advantageous for dry content increase.
  • such a fabric feed serving, for example, for producing a tissue web may also consist of unground material.
  • the inventive long press nip can be used particularly advantageously for increasing the specific volume.
  • the invention is also applicable for example for so-called "curled fibers".
  • the stock suspension in this case contains a proportion of fibers which have been subjected to a special treatment.
  • the substantially linear or curved in a plane pulp fibers are curved so that a spatial fiber shape, for example, arises in the manner of a spiral.
  • the invention can also be used in particular in a tissue paper machine with at least one so-called "through-air-drying" drying process, wherein the press nip according to the invention is used in particular before a corresponding "through-air-drying" device.
  • Such a combination is particularly advantageous in terms of a high dry content and a high specific volume.
  • a high dry content is achieved by the press nip according to the invention, whereby the operating costs of the energy-intensive drying phase are reduced.
  • the web is at most slightly compacted, which means that the specific volume of the web is increased or remains unimpaired at higher pressing pressures, which also makes the "through-air-drying" drying process more efficient and economical.
  • the invention is also applicable to the manufacture of multilayer webs using a single headbox or the manufacture of multilayer webs using multiple headboxes.
  • FIG. 1 shows a purely schematic partial representation of an embodiment of an inventive shoe press 10, which can be used for example in a machine for producing a fibrous web such as in particular a tissue or tissue paper web.
  • the press nip 12 of this shoe press 10 is formed between a shoe press unit, in the present case a shoe press roll 14, and a drying cylinder 16, through which except the fibrous web, a water-absorbing carrier tape 18 and a water-impervious press belt is passed, which is in the present case to the press cover 20 of the shoe press roll 14.
  • the water-absorbing carrier tape 18 may be formed in particular by a felt. In the present case, the water-absorbing carrier tape 18 is guided between the press cover 20 and the fibrous web through the press nip 12, wherein the fibrous web contacts the drying cylinder 16.
  • the shoe press roll 14 has a two-part press shoe 22, between the two parts of a thermal insulation layer 24 is inserted.
  • the press shoe 22 can be pressed against the drying cylinder 16 via a plurality of pressing elements 26 arranged juxtaposed transversely to the web running direction 1.
  • the drying cylinder 16 may be, for example, a Yankee cylinder.
  • the water-absorbing carrier tape 18 formed for example by a felt may have a different texture in the thickness direction.
  • the fibrous web facing side of the carrier tape 18 have a finer structure than its side facing away from the fibrous web page.
  • the press cover 20 may have a smooth, grooved and / or blind-bore surface.
  • press nip may be formed on the drying cylinder 16. In the web running direction 1 in front of the drying cylinder 16, an additional press nip can be provided.
  • the carrier tape 18 and the fibrous web in the web running direction 1 in front of the drying cylinder 16 can also be guided via at least one suction device.
  • the shoe press unit 14 may include at least one replaceable press shoe 22.
  • FIG. 2 the pressure profile or the pressure profile p (L) of a conventional shoe press is shown.
  • the pressing pressure p over the length L of the press nip 12 and the press shoe 22 is applied.
  • the shoe press 10 according to the invention can now be designed in particular such that the length L of the press nip 12 considered in the web running direction I (cf. FIG. 1 ) is less than or equal to a value of about 60 mm and whose over the press nip length L resulting pressure profile p (L) has a maximum pressing pressure p max , which is greater than or equal to a value of about 3.3 MPa.
  • FIG. 3 shows a comparison of the pressing pressure curve p 10 (L) of an exemplary embodiment of such a shoe press 10 according to the invention with a relatively long press shoe 12 with the pressing pressure curve p s (L) provided with a suction press conventional press.
  • the corresponding pressing pressure curve p 10 (L) has a significantly lower maximum pressing pressure p max (compare the shaded lower pressing pressure curve p 10 (for the maximum line force of 90 kN / m). L)).
  • the maximum pressing pressure p max even at a substantially higher maximum line force of 270 kN / m, is not higher than the maximum pressing pressure p max of the conventional press, for which in the present case a maximum line force of 90 kN / m is specified.
  • FIG. 4 shows the specific volume versus the dry content, comparing the results V 10 obtained for an exemplary embodiment of the shoe press 10 of the invention with a relatively long press shoe 12 again with the results V s for a conventional press provided with a suction press roll.
  • FIG. 5 shows in a schematic partial representation of another embodiment of a shoe press 10 according to the invention.
  • the angle ⁇ between the tangent 30 applied to the drying or tissue cylinder 16 at the end of the press nip 12 and the carrier web 18 leaving the press nip 12 has a significant influence on the dry content of the tissue web 28.
  • the present embodiment is characterized in that, in particular for producing a tissue web 28, this angle .alpha.
  • Between the tangent 30 applied to the drying or tissue cylinder 16 at the end of the press nip 12 and the carrier web 18 expiring from the press nip 12 is .gtoreq.10.degree .. in particular ⁇ 18 ° and preferably ⁇ 20 °. This results in a dry content increase of about 1 to 3% compared to applications with suction press rolls.
  • the press belt 18 is preferably grooved and / or blind drilled.
  • the present shoe press 10 again has the same structure as that according to FIG. 1 , Corresponding elements are provided with the same reference numerals.

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  • Paper (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Claims (11)

  1. Machine pour la fabrication d'une nappe fibreuse, en particulier nappe de papier tissu ou de papier hygiénique, comprenant au moins une fente de pressage (12) formée entre une unité de presse à sabot (14) et un cylindre de séchage ou de tissu (16), à travers laquelle sont guidées une bande de support (18) absorbant l'eau, une bande de pressage (20) imperméable à l'eau et la nappe fibreuse,
    caractérisée en ce
    qu'au moins une fente de pressage (12) formée entre une unité de presse à sabot (14) et le cylindre de séchage ou de tissu (16) est prévue, dont la longueur (L), considérée dans la direction d'avance de la nappe (I), est supérieure à une valeur d'environ 80 mm, de sorte que la nappe fibreuse à égoutter soit exposée dans la fente de pressage (12), pendant une durée d'au moins 3,5 ms, à une pression de pressage, et dont le profil de pression (p(L)) produit sur la longueur de la fente de pressage (L) présente une pression de pressage maximale (pmax), qui est inférieure ou égale à une valeur d'environ 2 MPa, la bande de support (18) et la nappe fibreuse étant guidées dans la direction d'avance de la nappe avant le cylindre de séchage (16) sur au moins un dispositif d'aspiration.
  2. Machine selon la revendication 1,
    caractérisée en ce que
    la force linéaire maximale produite dans la fente de pressage (12) est comprise dans une plage d'environ 90 à environ 110 kN/m, et/ou en ce que l'unité de presse à sabot (14) comprend un sabot de presse (22) qui peut être pressé par le biais de plusieurs éléments de pressage (26) disposés les uns à côté des autres transversalement à la direction d'avance de la nappe (I), de préférence commandables indépendamment les uns des autres, contre le cylindre de séchage.
  3. Machine selon la revendication 1 ou 2,
    caractérisée en ce que
    l'on prévoit comme cylindre de séchage (16) un cylindre Yankee, et/ou en ce que le profil de pression (p(L)) produit sur la longueur de la fente de pressage (L) est asymétrique.
  4. Machine selon l'une quelconque des revendications 1 à 3,
    caractérisée en ce que
    le profil de pression (p(L)) présente une pression de pressage maximale (pmax), qui est inférieure ou égale à une valeur d'environ 2 MPa, et en ce que la pression de pressage maximale (pmax) est appliquée dans le quart arrière de la longueur de la fente de pressage (L), considéré dans la direction d'avance de la nappe (I).
  5. Machine selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    le gradient d'augmentation de pression moyen dans la portion du profil de pression (p(L)) allant du début de la fente jusqu'à la pression de pressage maximale (pmax) dans le cas d'une nouvelle bande de support est supérieur ou égal à une valeur d'environ 40 kPa/mm, notamment supérieur ou égal à environ 60 kPa/mm, et de préférence supérieur ou égal à environ 120 kPa/mm, et/ou en ce que le gradient de chute de pression moyen dans la région d'extrémité du profil de pression (p(L)) dans le cas d'une nouvelle bande de support est supérieur ou égal à une valeur d'environ 300 kPa/mm, notamment supérieur ou égal à environ 500 kPa/mm, et judicieusement supérieur ou égal à environ 800 kPa/mm et de préférence supérieur ou égal à environ 960 kPa/mm, et/ou en ce que la bande de support (18) absorbant l'eau est située dans la fente de pressage (12) entre la bande de pressage (20) imperméable à l'eau et la nappe fibreuse, et la nappe fibreuse vient en contact avec le cylindre de séchage (16) et/ou en ce que l'on prévoit un feutre comme bande de support (18) absorbant l'eau.
  6. Machine selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la bande de support (18) absorbant l'eau présente, dans la direction de son épaisseur, une constitution différente et en ce que de préférence le côté de la bande de support (18) tourné vers la nappe fibreuse possède une structure plus fine que son côté opposé à la nappe fibreuse.
  7. Machine selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    la bande de pressage (20) possède une surface lisse, rainurée et/ou pourvue de perçages borgnes, et/ou en ce qu'au moins une fente de pressage supplémentaire (12) est formée sur le cylindre de séchage (16), de préférence au moins deux fentes de pressage (12) formées au moyen d'une unité de presse à sabot respective (14) étant prévues sur le cylindre de séchage (16).
  8. Machine selon l'une quelconque des revendications précédentes,
    caractérisée en ce
    qu'une fente de pressage supplémentaire (12) est prévue dans la direction d'avance de la nappe (I) avant le cylindre de séchage (16), et/ou en ce que l'on prévoit comme unité de presse à sabot un rouleau de presse à sabot (14), la bande de pressage étant de préférence formée par l'enveloppe de pressage (20) du rouleau de presse à sabot (14).
  9. Machine selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    l'unité de presse à sabot (14) comprend au moins un sabot de pressage (22) interchangeable, et/ou en ce que l'on prévoit comme bande de support (18) un feutre structuré à la manière d'une toile ou d'un feutre d'impression pourvu de protubérances, c'est-à-dire ce qu'on appelle un "imprinting fabric" ou "imprinting felt" ou un "patterning fabric" ou un "patterning felt" présentant une surface de structuration grossière.
  10. Utilisation de la machine selon l'une quelconque des revendications précédentes pour la fabrication d'une nappe fibreuse en utilisant ce qu'on appelle des "curled fibres".
  11. Procédé de fabrication d'une nappe fibreuse, en particulier d'une nappe de papier tissu ou de papier hygiénique, dans lequel la nappe fibreuse à égoutter est guidée conjointement avec une bande de support (18) à travers une fente de pressage (12) formée entre une unité de presse à sabot (14) et un cylindre de séchage ou de tissu (16), à travers laquelle sont guidées une bande de support (18) absorbant l'eau, une bande de pressage (20) imperméable à l'eau et la nappe fibreuse, caractérisé en ce que
    la nappe fibreuse à égoutter est exposée dans la fente de pressage (12), dont la longueur (L) considérée dans la direction d'avance de la nappe (I) est supérieure à une valeur d'environ 80 mm, pendant une durée d'au moins 3,5 ms, à une pression de pressage de 2 MPa au maximum, la bande de support (18) et la nappe fibreuse étant guidées dans la direction d'avance de la nappe avant le cylindre de séchage (16) sur au moins un dispositif d'aspiration.
EP07106782A 1998-12-29 1999-12-23 Machine et procédé pour la fabrication d'une bande fibreuse Expired - Lifetime EP1816256B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19860687A DE19860687A1 (de) 1998-12-29 1998-12-29 Maschine sowie Verfahren zur Herstellung einer Faserstoffbahn
EP99125789A EP1016754B1 (fr) 1998-12-29 1999-12-23 Machine et procédé pour la fabrication d'une bande fibreuse

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP99125789A Division EP1016754B1 (fr) 1998-12-29 1999-12-23 Machine et procédé pour la fabrication d'une bande fibreuse
EP99125789.0 Division 1999-12-23

Publications (2)

Publication Number Publication Date
EP1816256A1 EP1816256A1 (fr) 2007-08-08
EP1816256B1 true EP1816256B1 (fr) 2011-12-21

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EP99125789A Expired - Lifetime EP1016754B1 (fr) 1998-12-29 1999-12-23 Machine et procédé pour la fabrication d'une bande fibreuse
EP07106782A Expired - Lifetime EP1816256B1 (fr) 1998-12-29 1999-12-23 Machine et procédé pour la fabrication d'une bande fibreuse

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EP99125789A Expired - Lifetime EP1016754B1 (fr) 1998-12-29 1999-12-23 Machine et procédé pour la fabrication d'une bande fibreuse

Country Status (6)

Country Link
US (4) US6746574B2 (fr)
EP (2) EP1016754B1 (fr)
AT (2) ATE399224T1 (fr)
BR (1) BR9906261B1 (fr)
CA (4) CA2293215C (fr)
DE (2) DE19860687A1 (fr)

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DE10032251A1 (de) 2000-07-03 2002-01-17 Voith Paper Patent Gmbh Maschine sowie Verfahren zur Herstellung einer Faserstoffbahn
DE10032923A1 (de) * 2000-07-06 2002-01-24 Bosch Gmbh Robert Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen
EP1232854B2 (fr) * 2001-02-16 2008-07-09 The Procter & Gamble Company Procédé pour la fabrication d'une bande gaufrée épaisse et lisse
DE10209582A1 (de) * 2002-03-05 2003-09-18 Voith Paper Patent Gmbh Maschine zur Herstellung einer Tissuebahn
DE10233922A1 (de) * 2002-07-25 2004-02-12 Voith Paper Patent Gmbh Schuhpresse
DE10332906A1 (de) * 2003-07-19 2005-02-17 Voith Paper Patent Gmbh Entwässerungspresse
DE10351294A1 (de) * 2003-10-31 2005-06-02 Voith Paper Patent Gmbh Anpresseinrichtung
DE102014213512A1 (de) 2014-07-11 2016-01-14 Voith Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn
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
DE102018119383A1 (de) * 2018-08-09 2020-02-13 Voith Patent Gmbh Maschine und Verfahren zur Herstellung einer Wellpappenrohpapierbahn

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Also Published As

Publication number Publication date
ATE399224T1 (de) 2008-07-15
BR9906261B1 (pt) 2009-12-01
CA2718031A1 (fr) 2000-06-29
US7332059B2 (en) 2008-02-19
ATE538243T1 (de) 2012-01-15
US6746574B2 (en) 2004-06-08
BR9906261A (pt) 2000-08-22
US7288168B2 (en) 2007-10-30
EP1016754A1 (fr) 2000-07-05
US20040194904A1 (en) 2004-10-07
US20040261967A1 (en) 2004-12-30
CA2293215A1 (fr) 2000-06-29
DE19860687A1 (de) 2000-07-06
EP1016754B1 (fr) 2008-06-25
US20040134632A1 (en) 2004-07-15
CA2718114A1 (fr) 2000-06-29
US7326320B2 (en) 2008-02-05
CA2718031C (fr) 2012-10-09
DE59914794D1 (de) 2008-08-07
EP1816256A1 (fr) 2007-08-08
US20020069995A1 (en) 2002-06-13
CA2718114C (fr) 2013-02-12
CA2718288A1 (fr) 2000-06-29
CA2293215C (fr) 2011-08-30

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