EP2678472B1 - Section de presse d'une machine à fabriquer une bande de matière fibreuse et procédé de fabrication d'une bande de matière fibreuse - Google Patents

Section de presse d'une machine à fabriquer une bande de matière fibreuse et procédé de fabrication d'une bande de matière fibreuse Download PDF

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Publication number
EP2678472B1
EP2678472B1 EP11778915.6A EP11778915A EP2678472B1 EP 2678472 B1 EP2678472 B1 EP 2678472B1 EP 11778915 A EP11778915 A EP 11778915A EP 2678472 B1 EP2678472 B1 EP 2678472B1
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EP
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Prior art keywords
felt
press section
press
layers
layer
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Revoked
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EP11778915.6A
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German (de)
English (en)
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EP2678472A1 (fr
Inventor
Marc Erkelenz
Peter Mödl
Daniel Gronych
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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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/083—Multi-layer felts

Definitions

  • the invention relates to a press section for dewatering a fibrous web, in particular a paper, board or tissue web, in a machine for producing the same, in which only a single press nip is provided, wherein the press nip is formed by a shoe press roll and a counter roll, and Shoe press roll having a circumferential flexible jacket and a pressing element which can be pressed from the inside of the jacket and thus can press the jacket against the counter roll, and wherein the fibrous web can be performed together with at least one first felt through the press nip.
  • the invention relates to a method for producing a fibrous web, in particular a paper, board or tissue web, with the aid of such a press section.
  • the fibrous web is passed through the nip together with a felt or between two felts, which are themselves endlessly circumferential. Due to the pressing force with which the shoe press roll and the counter roll are pressed against each other, water is pressed out of the fibrous web into the felt and thus the fibrous web is dewatered.
  • Such a press section is known for example from the documents WO2004 / 022 845 A1 such as EP 1072721 A1 which describe a press section with only a single shoe press nip.
  • the shoe press nip has an extended compared to simple Walzenpressnips press zone.
  • the nip length is synonymous with the length of the press zone, which is given by the pressing element, the so-called shoe. This results in the fibrous web when passing through the press a longer residence time in the nip, ie in the press zone. And thus more water can be squeezed out.
  • press sections are successful in medium speed production machines used.
  • An example of this are machines for the production of copy paper or writing paper.
  • For other types of paper from not so easy to dehydrate fibers reach press sections with only a single press nip according to the prior art, however, no adequate drainage and therefore can not be used. Too little dry content after press leads to poor web travel and frequent breaks.
  • For such types of paper press sections are used with several press nips and, accordingly, several press and counter rolls.
  • the required press felts are used for example in the US 2005/13 67 63 A1 or the DE 10 2008 043917 A1 described, but can not satisfy when used in press sections with only one press nip.
  • the object of the invention is to develop a press section with only a single press nip so that it can be used for the dewatering of fibrous webs from difficult to dewater pulp and thereby a sufficient dry content is achieved, and a method for producing a fibrous web with such To provide press section.
  • the first felt of the claimed press section comprises a basic structure having at least one layer of exclusively twisted monofilament threads and at least one non-woven layer consisting of a group of threads, wherein the threads of a layer in the Essentially aligned in the direction of web travel.
  • the first felt may be an upper felt or a lower felt in the press section. Due to pilot plant tests, it was recognized that the dewatering performance of a press nip can be significantly improved if a purpose optimized felt is used as described above.
  • the basic structure with a layer of monofilament threads offers less inner surface and the non-woven layer has no cross points with transverse or diagonal threads, so that less fines or dirt particles accumulate and the felt is less polluted than with felts a basic structure of layers with multifilament threads or of woven layers.
  • dewater fibrous materials such as heavily ground pulps or wood pulp or waste paper-containing materials, contain a large amount of fines or soil particles, they are rinsed by the fibrous web during drainage into the felt. If they can not be deposited there, the felt retains its good drainage properties and a high dry content is achieved.
  • This felt is less compacted in the shoe press nip as opposed to felts with a base structure of woven layers and therefore retains important in the nip its important for drainage permeability, which is particularly important for shoe press nips due to the longer residence time and the high load in the press zone. In addition, it retains over a longer term, i. even with numerous circulations, the necessary permeability and does not have to be changed so quickly.
  • the pilot plant tests have also shown that other felts so heavily foul very quickly, sometimes within a few hours, in such an application that the drainage performance drops unacceptably. With some felts, the press section does not achieve satisfactory drainage from the beginning.
  • the basic structure of a felt serves to ensure the tensile strength in the web running direction and in the transverse direction. It consists of twisted threads, which are either processed into a woven layer or processed into a nonwoven so-called scrim layer.
  • the basic structure can have several layers.
  • the threads consist of several individual yarn threads, which are twisted together.
  • the individual yarn threads can be monofilaments, ie in each case a single compact yarn thread, or multifilaments, that is, be twisted or spun from many individual very fine filament fibers.
  • the monofilaments preferably have a diameter of 0.1 to 0.5 mm. By monofilament yarn is meant when all yarn yarns are monofilaments.
  • multifilament yarns it is meant that one or more yarn yarns are multifilament yarns or a yarn yarn twisted in itself from individual fibers.
  • scrim layers important that at least one layer is arranged so that the threads do not deviate more than 10 °, preferably not more than 5 ° from the web running direction.
  • a further advantage of the press section according to the invention is that drive energy can be saved in the press in comparison to the multiple-nip press section otherwise necessary for more difficultly dewaterable fibrous webs. Furthermore, there are less felting, operating and maintenance costs in a single-nip press.
  • a second felt and thus all the felts of the single-nip press section, comprises a basic structure which has at least one ply of exclusively twisted monofilament threads and at least one non-woven ply consisting of a group of threads the threads of a layer are aligned substantially in the web running direction.
  • the deviation to the web running direction should be at most 10 °, preferably the highest 5 °.
  • the first and second felts thus formed improve the dewatering performance of the press section in both directions up and down.
  • the drainage performance is also improved if the first and / or second felt has a basic structure with at least three layers. This can make the felt more stable.
  • the fouling tendency of the felt is further reduced and thus the drainage is further improved if the first and / or the second felt has a basic structure in which all layers consist exclusively of twisted monofilament threads. This further reduces the internal surface that could deposit particles.
  • first and / or the second felt has a basic structure in which all layers are non-woven. This provides the felt with significant compaction resistance.
  • One or more nonwoven layers of felted and needled fibers are applied to the base structure of a felt to achieve a more uniform pressure distribution in the nip and to avoid marking the base fabric in the fibrous web. It can also be targeted parts of the nonwoven layers integrated into the basic structure and located between the layers or even within the layers between the threads. As a result, the porosity of the basic structure can be selectively changed or adjusted.
  • the nonwoven layers differ in the fineness of the fibers used for production.
  • the common unit for specifying the fiber fineness is the indication of the fiber weight per length in dtex according to the standard ISO 1144. 1 dtex corresponds to 1 gram per 10 000 m.
  • the first and / or the second felt has a coarse fleece layer, which is composed of coarse fibers having a fiber fineness between 67 and 200 dtex.
  • the coarse fleece can be integrated into the basic structure, so that too large gaps in the basic structure are filled or it is arranged as an intermediate layer between two layers of the basic structure, so that even here there is a pressure distribution.
  • the coarse nonwoven layer can also be laid onto the basic structure, preferably on the side facing the fibrous web, or it even encloses the basic structure or individual layers of the basic structure, so that they are embedded in the coarse nonwoven.
  • the coarse nonwoven layer consists of one or more layers, each layer having a basis weight of at least 100 g / m 2 , preferably of at least 150 g / m 2 .
  • the weight of the entire coarse nonwoven layer is preferably between 100 g / m 2 and 600 g / m 2 .
  • the coarse nonwoven layer as a whole should have no preferred orientation.
  • a random fleece is a fleece layer in which the fibers have no preferred orientation, that is, that they are confused in all directions.
  • the coarse nonwoven layer can also consist of at least two layers which, although they have a preferred direction of the fibers, but are superposed so that the preferred directions differ by at least 5 °, preferably at least 20 ° from each other. In the case of more than two layers, it is particularly advantageous if the respectively adjacent layers deviate from one another by at least 5 °, preferably by at least 20 °.
  • the first and / or the second felt has one or more nonwoven layers which are arranged on the side of the basic structure facing the fibrous web and which consist of fibers with a fiber fineness of 22 to 67 dtex.
  • the drainage can be further improved. Only when the pressure distribution is as even as possible over the surface, the fibrous web can be well drained. Too coarse and only selective pressure not only leads to markings, but also to only moderate drainage.
  • these layers may contain in addition to polyamide fibers and melt fibers.
  • Melt fibers are partially or wholly of polymer which has a lower softening or melting temperature. They may also be formed as so-called BiCo or Bi-component fibers, in which case the core is formed of polyamide and the sheath of the lower-melting polymer.
  • the softening or melting temperature of the molten fiber is between 90 and 140 ° C. When thermofixing the felts, this temperature is reached, so that the melt fibers are soft and act as an adhesive.
  • the first and / or the second felt may have a fine fleece layer on the felt surface facing the fibrous web, which consists of fibers with a fiber fineness of at most 11 dtex.
  • This fine nonwoven layer can be quite thin, for example less than 100 g / m 2 , preferably less than 50 g / m 2 and can be abraded during operation or removed by high-pressure cleaning spray pipes during operation. It is necessary only during the fairly short time of running in.
  • the felt in the press section according to the invention can be adapted even better to the specific conditions, so that it has a good start-up behavior, good drainage even with difficultly dewaterable fibers and good long-term behavior even at high fines and has dirt particle load.
  • the object is achieved for the method according to the invention in that a press section according to one of claims 1 to 14 is used, wherein the pulp, which is used to produce the fibrous web, at least 60%, preferably at least 80% recovered from waste paper ,
  • the advantages of the invention are particularly strong.
  • the pulp may consist directly of recycled waste paper, that is, without deinking so produced without printing ink removal, or from a cleaned waste paper, which has passed through a deinking plant with flotation or washing stage.
  • press according to the invention in the production of newsprint paper having a basis weight of 30 to 52 g / m 2 or in packaging paper with a basis weight of 70 to 120 g / m 2 . So far, press sections with two, three or even four press nips are required for these papers.
  • Fig.1 shows the structure of a possible felt 5.1 in cross section.
  • the basic structure 12 here consists of two layers 12.1 and 12.2, of which at one, namely at the position 12.1, the threads are aligned in the direction of web travel 1a and in which case both layers of monofilament threads (20 and 20.1) exist.
  • the coarse nonwoven layer 13 is arranged between the basic structure layers as an intermediate layer. In this case, the coarse nonwoven layer 13 can be constructed from one or more layers. Overall, the weight of the coarse nonwoven layer 13 is between 100 g / m 2 and 600 g / m 2 .
  • On the side facing the fibrous web are two further nonwoven layers 14, 15 and a fine nonwoven layer 16.
  • a nonwoven layer 17 is applied. This combination achieves very good drainage over the entire life of the felt.
  • melt fibers may be contained, which serve to fix the nonwoven layers in the production of the felt on the base structure.
  • the monofilament threads can be made of different numbers of individual yarn threads that are twisted together.
  • 2a is a monofilament thread 20.2 shown with 9 yarn threads
  • 2b a monofilament thread 20.3 with 4 yarn threads
  • in Figure 2c a monofilament thread 20.4 with 6 yarn threads. All yarn threads are monofilaments 21.1, 21.2, 21.3.
  • FIG. 3a shows an example of a monofilament 21.4 as it can be used as a yarn.
  • Fig. 3b shows in comparison to a multifilament 22.1, which is twisted or spun from numerous fine individual fibers.
  • FIG 4 a possible embodiment for a press section 10 according to the invention is shown.
  • the shoe press roll 2 forms with the counter roll 3 the press nip by the pressing member 4, the so-called shoe, is pressed from the inside of the jacket 7 and thus brings the jacket with the counter roll 3 in contact.
  • the top felt 5 passes around the suction roll 8 and transports the fibrous web 1, which comes from a sheet forming unit, to the press nip, which passes through the fibrous web 1 in the sandwich between bottom flap 6 and top felt 5. Thereafter, the felts 5, 6 are separated on the suction roll 9 and the fibrous web, 1 continues with the lower felt 6 on. The fibrous web 1 is then continued to a drying section, not shown. Both felts 5, 6 run around endlessly, which is also not shown.
  • the first felt may be the top felt 5 or the bottom felt 6.
  • the shoe press roll may also be arranged as a lower roll and the counter roll as an upper roll.

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  • Paper (AREA)
  • Nonwoven Fabrics (AREA)

Claims (17)

  1. Section de presse (10) pour l'essorage d'une bande de matière fibreuse (1), en particulier d'une bande de papier, de carton ou d'essuie-tout, dans une machine de fabrication de celle-ci dans laquelle il n'est prévu qu'une seule emprise de presse, dans laquelle l'emprise de presse est formée par un rouleau de presse à sabot (2) et un contre-rouleau (3), et le rouleau de presse à sabot (2) présente une enveloppe flexible périphérique (7) et un élément de presse (4), qui peut être pressé de l'intérieur sur l'enveloppe (7) et qui peut ainsi pousser l'enveloppe (7) contre le contre-rouleau (3), et dans laquelle la bande de matière fibreuse (1) peut être guidée à travers l'emprise de presse de concert avec au moins un premier feutre (5, 5.1, 6), caractérisée en ce que le premier feutre (5, 5.1, 6) comprend une structure de base (12), qui présente au moins une couche (12.1, 12.2) en fils mono-filament exclusivement retordus (20, 20.1, 20.2, 20.3, 20.4) et au moins une couche non tissée (12.1, 12.2) se composant d'un faisceau de fils (20, 20.1, 20.2, 20.3, 20.4), dans laquelle les fils de ladite une couche sont orientés essentiellement dans la direction de défilement de la bande.
  2. Section de presse selon la revendication 1, caractérisée en ce que la section de presse (10) comprend un deuxième feutre (5, 5.1, 6) avec une structure de base (12), qui présente au moins une couche (12.1, 12.2) en fils mono-filament exclusivement retordus (20, 20.1, 20.2, 20.3, 20.4) et au moins une couche non tissée (12.1, 12.2) se composant d'un faisceau de fils (20, 20.1, 20.2, 20.3, 20.4), dans laquelle les fils de ladite une couche sont orientés essentiellement dans la direction de défilement de la bande.
  3. Section de presse selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins un feutre (5, 5.1, 6) présente une structure de base (12) avec au moins trois couches (12.1, 12.2).
  4. Section de presse selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins un feutre (5, 5.1, 6) présente une structure de base (12), dans laquelle toutes les couches (12.1, 12.2) se composent exclusivement de fils mono-filament retordus (20, 20.1, 20.2, 20.3, 20.4).
  5. Section de presse selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins un feutre (5, 5.1, 6) présente une structure de base (12), dans laquelle toutes les couches (12.1, 12.2) sont non tissées.
  6. Section de presse selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins un feutre (5, 5.1, 6) présente une couche non tissée grossière (13), qui se compose de fibres présentant une finesse de fibre comprise entre 67 dtex et 200 dtex.
  7. Section de presse selon la revendication 6, caractérisée en ce que la couche non tissée grossière (13) est intégrée dans la structure de base et est prévue au moins partiellement entre deux couches (12.1, 12.2) de la structure de base (12).
  8. Section de presse selon la revendication 6, caractérisée en ce qu'au moins une couche (12.1, 12.2) de la structure de base (12) est noyée dans la couche non tissée grossière (13) ou est enveloppée par la couche non tissée grossière (13).
  9. Section de presse selon la revendication 6, caractérisée en ce que la couche non tissée grossière (13) se compose d'une ou de plusieurs couches et chaque couche possède un poids par unité de surface d'au moins 100 g/m2, et de préférence d'au moins 150 g/m2.
  10. Section de presse selon la revendication 6, caractérisée en ce que la couche non tissée grossière (13) se compose d'une ou de plusieurs couches, qui sont réalisées sous forme de non tissé à fibres embrouillées, dans lequel les fibres sont disposées sans direction préférentielle.
  11. Section de presse selon la revendication 6, caractérisée en ce que la couche non tissée grossière (13) se compose d'au moins deux couches, qui présentent respectivement une direction préférentielle, dans laquelle une grande partie des fibres sont orientées, dans laquelle les directions préférentielles des deux couches s'écartent l'une de l'autre d'au moins 5°, de préférence d'au moins 20°.
  12. Section de presse selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins un feutre (5, 5.1, 6) présente une ou plusieurs couches non tissées (14, 15, 17) qui, par rapport à la structure de base (12), sont disposées sur le côté tourné vers la bande de matière fibreuse et qui se composent de fibres présentant une finesse de fibres comprise entre 22 dtex et 67 dtex.
  13. Section de presse selon l'une quelconque des revendications précédentes, caractérisée en ce que des fibres fusibles et des fibres de polyamide sont contenues dans une couche non tissée (14, 15, 17) d'au moins un feutre (5, 5.1, 6), dans laquelle les fibres fusibles présentent au moins en partie une température de ramollissement ou de fusion inférieure à celle des fibres de polyamide.
  14. Section de presse selon l'une quelconque des revendications 6 à 13, caractérisée en ce que des fibres fusibles et des fibres de polyamide sont contenues dans une couche non tissée grossière (13) d'au moins un feutre (5, 5.1, 6), dans laquelle les fibres fusibles présentent au moins en partie une température de ramollissement ou de fusion inférieure à celle des fibres de polyamide.
  15. Section de presse selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins un feutre (5, 5.1, 6) présente une fine couche non tissée (16), qui est prévue sur la face du feutre (11) tournée vers la bande de matière fibreuse et se compose de fibres présentant une finesse de fibres de 11 dtex au maximum.
  16. Procédé de fabrication d'une bande de matière fibreuse, en particulier d'une bande de papier, de carton ou d'essuie-tout, à l'aide d'une section de presse (10) selon l'une quelconque des revendications précédentes, dans lequel la matière fibreuse, que l'on utilise pour la fabrication de la bande de matière fibreuse (1), a été obtenue pour au moins 60 %, de préférence pour au moins 80%, à partir de vieux papiers.
  17. Procédé selon la revendication 16, caractérisé en ce que la bande de matière fibreuse (1) est une bande de papier journal présentant un grammage compris entre 30 et 52 g/m2, ou une bande de papier d'emballage présentant un grammage compris entre 70 et 120 g/m2.
EP11778915.6A 2011-02-23 2011-11-07 Section de presse d'une machine à fabriquer une bande de matière fibreuse et procédé de fabrication d'une bande de matière fibreuse Revoked EP2678472B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011004568A DE102011004568A1 (de) 2011-02-23 2011-02-23 Pressenpartie einer Maschine zur Herstellung einer Faserstoffbahn
PCT/EP2011/069516 WO2012113466A1 (fr) 2011-02-23 2011-11-07 Section de presse d'une machine à fabriquer une bande de matière fibreuse et procédé de fabrication d'une bande de matière fibreuse

Publications (2)

Publication Number Publication Date
EP2678472A1 EP2678472A1 (fr) 2014-01-01
EP2678472B1 true EP2678472B1 (fr) 2016-03-02

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EP11778915.6A Revoked EP2678472B1 (fr) 2011-02-23 2011-11-07 Section de presse d'une machine à fabriquer une bande de matière fibreuse et procédé de fabrication d'une bande de matière fibreuse

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EP (1) EP2678472B1 (fr)
CN (1) CN103384741B (fr)
DE (1) DE102011004568A1 (fr)
WO (1) WO2012113466A1 (fr)

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US11098450B2 (en) 2017-10-27 2021-08-24 Albany International Corp. Methods for making improved cellulosic products using novel press felts and products made therefrom
CN108203864A (zh) * 2018-01-16 2018-06-26 绍兴国周控股集团有限公司 用于纤维或纤维网的轧液装置
DE102018118604A1 (de) * 2018-08-01 2020-02-06 Voith Patent Gmbh Pressmantel, dessen Verwendung sowie Presswalze und Schuhpresse
SE542214C2 (en) * 2018-10-12 2020-03-10 Valmet Oy A tissue paper making machine and a method of operating a tissue paper making machine
DE202019102306U1 (de) * 2019-04-24 2019-07-25 Heimbach Gmbh Pressfilz mit einem Fadengelege und einem auf der Maschinenseite oder der Papierseite des Fadengeleges vorgesehenen Trägervlies
DE102020121627A1 (de) 2020-08-18 2022-02-24 Voith Patent Gmbh Pressfilz

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O. KAAPA: "Single Shoe Pressen in Feinpapiermaschinen - eine Herausforderung für Bespannungshersteller", WOCHENBLATT FÜR PAPIERFABRIKATION, vol. 133, no. 10, May 2005 (2005-05-01), pages 570 - 571, XP055333138, ISSN: 0043-7131
O. KAAPA: "World speed record with non-woven SSP special felts", IPW, April 2009 (2009-04-01), pages 32 - 33, XP055333144
SABIT ADANUR: "Papier Maschine Clothing", 1997, ISBN: 1-56676-544-7, article "Chapter 3 - Pressing", pages: 153 - 166, XP055333156

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CN103384741B (zh) 2016-12-14
EP2678472A1 (fr) 2014-01-01
CN103384741A (zh) 2013-11-06
DE102011004568A1 (de) 2012-08-23

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