EP4200475B1 - Feutre de presse - Google Patents

Feutre de presse

Info

Publication number
EP4200475B1
EP4200475B1 EP21737656.5A EP21737656A EP4200475B1 EP 4200475 B1 EP4200475 B1 EP 4200475B1 EP 21737656 A EP21737656 A EP 21737656A EP 4200475 B1 EP4200475 B1 EP 4200475B1
Authority
EP
European Patent Office
Prior art keywords
threads
fabric layer
thread
longitudinal
transverse
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.)
Active
Application number
EP21737656.5A
Other languages
German (de)
English (en)
Other versions
EP4200475A1 (fr
Inventor
Robert EBERHARDT DR.
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 EP4200475A1 publication Critical patent/EP4200475A1/fr
Application granted granted Critical
Publication of EP4200475B1 publication Critical patent/EP4200475B1/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
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/083—Multi-layer felts

Definitions

  • press felts are used to transport and dewater the fiber web in the press section.
  • the main components of such felts are a load-bearing base structure and nonwoven layers, which are usually needled to the base structure. In most cases, fabrics are used for the base structures.
  • the load-bearing base structure can have several fabric layers arranged one above the other. Felts with such basic structures are used, for example, in EP 0 425 523 or the EP O 672 784 81 Likewise, as described in the EP2160495 B1 As described, several layers of nonwoven fibers with different fiber finenesses can also be provided.
  • a press felt is subjected to repeated stresses in one or more press nips.
  • the felt In the press nip, the felt is compressed, and after passing through the press nip, the felt expands again essentially to its original thickness. Since this process is repeated extremely frequently, the felt compacts after a short time.
  • the state of the art explains this by the compression of the nonwoven layers. Compaction of the fabric layers with the formation of a layer of reduced permeability also occurs. This changes important properties of the felt, such as the permeability.
  • EP2 678 472 It is known to provide a particularly fine fleece layer, which is abraded during operation of the felt. The abrasion of the fine fleece fibers increases the permeability of the felt, while simultaneously reducing it through compaction. While this can achieve a largely consistent permeability of the felt, the provision of the "sacrificial fleece layer" involves additional costs and effort.
  • a press felt for a machine for producing a fibrous web comprising a woven base structure and a nonwoven overlay attached thereto, wherein the base structure has a first fabric layer and a second fabric layer.
  • the first fabric layer has longitudinal threads and transverse threads that intersect at intersection points, wherein the longitudinal threads and the transverse threads of the first fabric layer are welded together at at least 5% of the intersection points, in particular at at least 10% of the intersection points.
  • the inventor proposes that, at least in the first fabric layer, parts of the longitudinal threads and transverse threads that cross at intersection points are welded together. It is envisaged that at least 5% of the intersection points, in particular at least 10% of the intersection points, the longitudinal threads and the transverse threads of the first fabric layer are materially connected to one another, in particular welded to one another. In this way, the displacement of the threads is prevented or made more difficult, and the compaction effect described above is suppressed.
  • the fixation of the threads and the suppression of displacement increases.
  • this also increases the stiffness of the basic structure and thus of the entire felt. This is usually only possible or desired to a certain extent.
  • the longitudinal threads and the transverse threads of the first fabric layer are welded together at less than 60%, in particular at less than 50% of the crossing points.
  • the advantageous effect of the invention can be increased if the second fabric layer also has longitudinal threads and transverse threads crossing at crossing points, wherein at least 5% of the crossing points, in particular at least 10% of the crossing points, the longitudinal threads and the transverse threads of the second fabric layer are materially connected to one another, in particular welded to one another. This further reduces the mobility of the threads of the two layers relative to one another.
  • the second layer too, it is true that with an increase in the proportion of welded crossing points, e.g.
  • the fixation of the threads and the suppression of displacement increases and that it is often advantageous if the longitudinal threads and the transverse threads of the second Fabric layers are welded together at less than 60%, in particular at less than 50% of the crossing points.
  • the basic structure has exactly two fabric layers, designs can also be provided in which the basic structure comprises one or more further layers, in particular one or more further fabric layers.
  • the material connection at the intersection points can be created in various ways.
  • Bi-component fibers consist of two components, e.g., a core and a sheath.
  • the two polymers have different softening or melting temperatures.
  • the melting temperature of the core is higher than that of the sheath, so that the sheath can be melted at a certain temperature increase, thus creating connection points between the respective core fibers in the mixture of the existing matrix.
  • An alternative is to join the MD and CD fibers together using welded joints.
  • Various processes such as ultrasonic welding or transmission welding, are possible for creating the welded joint.
  • NIR transmission welding is considered particularly advantageous.
  • the polyamide threads commonly used are largely transparent to light in the NIR range between approximately 780 nm and 1100 nm.
  • the longitudinal threads and/or the transverse threads of the first layer and/or the second layer absorb laser light of a wavelength that lies in the range between 780 nm and 1100 nm completely or to a significant extent.
  • a significant absorption of more than 30%, in particular more than 40% of the corresponding light is considered to be a significant absorption.
  • Such threads are referred to below as absorbing threads).
  • the absorbent threads can be made of the same polymer as the other threads, with an additional absorber additive added. This allows for particularly durable welded joints.
  • compatible polymers can be used instead of the same polymer, e.g., polyamide 6 and polyamide 6.6.
  • this selective irradiation takes place in the form of regular patterns, e.g. in the form of straight lines, wavy lines, dot patterns, etc.
  • the width of these lines or the diameter of the dots can in particular be chosen to be so large that several crossing points, in particular 2, 3, 4, 5 or more, are covered.
  • intersection points with the material-fit connections are not located exclusively in a part of the covering - for example, a seam area - but are distributed over the entire surface of the covering and, in particular, are evenly distributed.
  • Such a uniform distribution can be achieved, for example, by weaving absorbent threads as CD threads or MD threads according to a fixed, predetermined pattern. For example, every 10th CD thread can be an absorbent thread. This leads to a rather low Number of connection points. If every 4th CD thread, every 2nd CD thread, or even every CD thread is woven in as an absorbent thread, the number of possible connection points increases.
  • BiCo threads can also be woven according to the pattern described above.
  • Adjacent crossing points are understood to be the four crossing points that are directly adjacent in the longitudinal and transverse directions.
  • Such an arrangement of the material-to-material connections, in particular the welded connections, is advantageous because it allows for good fixation of the threads, but even with a comparatively high proportion of material-to-material crossing points (e.g. 30%, 40% or 50%), the increase in the stiffness of the structure still remains tolerable.
  • Such a fabric layer is also easy to manufacture.
  • a plain weave fabric can be used as the first fabric layer.
  • the fabric can be made of longitudinal threads that are transparent to light of a specific wavelength, while the transverse threads absorb this wavelength completely or partially.
  • the bonded joints can then be realized as welded joints using transmission welding with light of this wavelength.
  • the fabric is irradiated from one side with light of this wavelength, for example, using a laser, there are intersection points where the transparent thread lies above the absorbing thread. At these intersection points, the light penetrates the transparent thread and is absorbed by the absorbing thread, causing heating at the contact point and a cohesive bond.
  • the absorbent thread now lies above the transparent thread at the four adjacent intersection points. Therefore, the absorbent thread only heats up on its surface, not at the contact point. Thus, there is no material bond at these intersection points.
  • Figure 1 shows a fabric layer that can be used as a first fabric layer 1 or a second fabric layer 2 in a press felt according to one aspect of the invention. Shown is a plain weave fabric made of intersecting longitudinal threads 3 and transverse threads 4. Some of the transverse threads 6 are designed as absorbent threads 6. In the case of the Figure 1 In the example shown, every second transverse thread 4 is designed as an absorbent thread 6. The remaining threads 3, 4 are made of a material such as a polyamide, which is completely or largely transparent to light in the NIR range.
  • the absorbent threads 6 can, for example, consist of the same polymer to which an absorber additive is added.
  • crossing points 5 are irradiated with light from a wavelength range that the absorbent threads 6 absorb - for example using a corresponding NIR laser - this light penetrates through the non-absorbing longitudinal threads 3 to the absorbing threads 6. These heat up primarily at the contact point between the two threads, resulting in a material-to-material connection between the two threads in the form of a welded joint.
  • intersection points 5 can be welded, or only a part of them.
  • the Figures 2a, 2b and 2c show schematically the behavior of a press felt under load, in which no intersection points 5 are materially connected to one another in any of the fabric layers 1, 2.
  • the press felt has a first fabric layer 1 and a second fabric layer 2, which together provide the basic structure of the felt.
  • a fleece layer 7 is provided on the first fabric layer 1.
  • the first fabric layer 1 and the second fabric layer 2 are different, which is exemplified here by different diameters of the longitudinal threads 3.1 of the first layer 1 and the longitudinal threads 3.2 of the second layer 2.
  • the two layers 1, 2 can also be of the same fabric type, in particular they can, as in EP 0 425 523 described, can be formed by folding and stacking a single piece of fabric.
  • Figure 2a shows the felt without external load.
  • a load acts on the felt when passing through a press nip.
  • the second fabric layer 2 is thereby pressed upward against the first fabric layer. This creates shear forces in the transverse direction on the longitudinal threads 3.1, 3.2, favored by the round shape of the threads.
  • Figure 2c shows the felt in compressed form.
  • the external load compresses the fleece layer 7.
  • the longitudinal threads 3.1, 3.2 also shift in the transverse direction, so that the two fabric layers 1, 2 are partially pressed into each other.
  • the void volume of one fabric layer 1, 2 is thus partially filled by the threads of the other fabric layer 2, 1 and is no longer available for fluid absorption.
  • Figure 3 differs from Figure 2c merely in that the felt is constructed according to one aspect of the present invention.
  • at least 5% of the intersection points 5, in particular at least 10% of the intersection points 5, the longitudinal threads 3.2 and the transverse threads 4 of the second fabric layer 2 are integrally connected to one another, in particular welded to one another.
  • the nonwoven overlay 7 is compressed.
  • the longitudinal threads 3.1, 3.2 cannot deflect in the transverse direction.
  • the transverse forces are absorbed by the cohesive connections at the intersection points 5. This prevents or at least reduces penetration of the first fabric layer 1 and the second fabric layer 2.
  • the void volume of the fabric layers 1, 2 is barely reduced by penetrating threads 3, 4 of the other fabric layer 2, 1 and thus remains available for fluid absorption.

Landscapes

  • Nonwoven Fabrics (AREA)
  • Paper (AREA)

Claims (7)

  1. Feutre de presse pour une machine de fabrication d'une bande de matière fibreuse, comprenant une structure de base tissée ainsi qu'un support de non-tissé (7) fixé sur celle-ci, la structure de base présentant une première couche de tissu (1) et une deuxième couche de tissu (2), au moins la première couche de tissu (1) présentant des fils longitudinaux (3, 3.1) et des fils transversaux (4), caractérisé en ce qu'à au moins 5 % des points de croisement (5), en particulier à au moins 10 % des points de croisement (5), les fils longitudinaux (3, 3.1) et les fils transversaux (4) de la première couche de tissu (1) sont reliés entre eux par une liaison de matière, les points de croisement (5) avec les liaisons de matière ne se trouvant pas exclusivement dans une zone partielle du feutre de presse - en particulier une zone de couture - mais étant répartis sur toute la surface du feutre de presse, en particulier répartis uniformément, et les fils longitudinaux (3, 3.1) et les fils transversaux (4) de la première couche de tissu (1) sont soudés entre eux à moins de 60%, en particulier à moins de 50% des points de croisement (5).
  2. Feutre de presse selon l'une des revendications précédentes, caractérisé en ce que la deuxième couche de tissu (2) présente également des fils longitudinaux (3, 3.2) et des fils transversaux (4) qui se croisent aux points de croisement (5), les fils longitudinaux (3, 3.2) et les fils transversaux (4) de la deuxième couche de tissu (2) étant reliés entre eux par une liaison de matière, en particulier soudés entre eux, à au moins 5% des points de croisement (5), en particulier à au moins 10% des points de croisement (5).
  3. Feutre de presse selon l'une des revendications précédentes, caractérisé en ce que la structure de base comprend encore une autre couche, en particulier une autre couche de tissu.
  4. Feutre de presse selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins certains des fils longitudinaux (3, 3.1, 3.2) et/ou des fils transversaux (4) de la première couche de tissu (1) sont des fils absorbants (6) qui absorbent totalement ou dans une mesure significative la lumière laser d'une longueur d'onde qui se situe dans la plage comprise entre 780 nm et 1100 nm.
  5. Feutre de presse selon la revendication 4, caractérisé en ce qu'au moins chaque 10ème fil transversal (4) , en particulier au moins chaque 4ème fil transversal (4), de préférence chaque 2ème fil transversal (4), est un fil absorbant (6).
  6. Feutre de presse selon l'une des revendications 4 ou 5, caractérisé en ce qu'au moins chaque 10ème fil longitudinal (3, 3.1, 3.2), en particulier au moins chaque 4ème fil longitudinal (3, 3.1, 3.2), de préférence chaque 2ème fil longitudinal (3, 3.1, 3.2) est un fil absorbant (6).
  7. Feutre de presse selon l'une des revendications précédentes, caractérisé en ce que dans la première couche de tissu (1) et/ou la deuxième couche de tissu (2), à chaque point de croisement (5) où les fils longitudinaux (3, 3.1) et les fils transversaux (4) sont reliés entre eux par la matière, il n'existe pas de liaison par la matière aux points de croisement (5) voisins.
EP21737656.5A 2020-08-18 2021-06-30 Feutre de presse Active EP4200475B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020121627.0A DE102020121627A1 (de) 2020-08-18 2020-08-18 Pressfilz
PCT/EP2021/067968 WO2022037832A1 (fr) 2020-08-18 2021-06-30 Feutre de presse

Publications (2)

Publication Number Publication Date
EP4200475A1 EP4200475A1 (fr) 2023-06-28
EP4200475B1 true EP4200475B1 (fr) 2025-08-06

Family

ID=76796995

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21737656.5A Active EP4200475B1 (fr) 2020-08-18 2021-06-30 Feutre de presse

Country Status (6)

Country Link
US (1) US12454794B2 (fr)
EP (1) EP4200475B1 (fr)
CN (1) CN115885072B (fr)
DE (1) DE102020121627A1 (fr)
FI (1) FI4200475T3 (fr)
WO (1) WO2022037832A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220275580A1 (en) * 2019-07-15 2022-09-01 Voith Patent Gmbh Paper machine clothing and method
DE102023135943A1 (de) 2023-12-20 2025-06-26 Voith Patent Gmbh Grundstruktur, Bespannung und Verfahren

Citations (2)

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DE4404507A1 (de) * 1994-02-12 1995-08-17 F & W Tech Faeden Gmbh Pressenfilz für die Papierindustrie
DE102012207016A1 (de) * 2012-04-27 2013-10-31 Voith Patent Gmbh Stabilisierte Webnaht für flachgewebte Endlosgewebebänder

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US4259394A (en) * 1979-09-26 1981-03-31 Huyck Corporation Papermaking fabrics with enhanced dimensional stability
GB8814436D0 (en) 1988-06-17 1988-07-20 Scapa Group Plc Papermachine clothing
GB2287257A (en) 1994-03-10 1995-09-13 Scapa Group Plc Papermakers marking felt
US5549967A (en) 1995-05-04 1996-08-27 Huyck Licensco, Inc. Papermakers' press fabric with increased contact area
US5888915A (en) 1996-09-17 1999-03-30 Albany International Corp. Paper machine clothings constructed of interconnected bicomponent fibers
DE19903304A1 (de) * 1999-01-28 2000-08-03 Hauser Manfred Gewebematte als Mikrobewehrung mit integrierten Verdrängungskörpern
EP1357223B1 (fr) 2002-04-25 2006-05-17 Thomas Josef Heimbach Gesellschaft mit beschränkter Haftung & Co. Toile pour machine à papier et son procédé de fabrication
US7022208B2 (en) * 2002-12-31 2006-04-04 Albany International Corp. Methods for bonding structural elements of paper machine and industrial fabrics to one another and fabrics produced thereby
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DE102006059482A1 (de) * 2006-12-08 2008-06-12 Voith Patent Gmbh Gewebeband für eine Maschine zur Herstellung von Bahnmaterial, insbesondere Papier oder Karton
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BRPI0816197B1 (pt) 2007-09-05 2018-12-18 Albany Int Corp método de solda de parte de tecido industrial e costura.
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Publication number Priority date Publication date Assignee Title
DE4404507A1 (de) * 1994-02-12 1995-08-17 F & W Tech Faeden Gmbh Pressenfilz für die Papierindustrie
DE102012207016A1 (de) * 2012-04-27 2013-10-31 Voith Patent Gmbh Stabilisierte Webnaht für flachgewebte Endlosgewebebänder

Also Published As

Publication number Publication date
FI4200475T3 (fi) 2025-11-12
EP4200475A1 (fr) 2023-06-28
US12454794B2 (en) 2025-10-28
US20240026607A1 (en) 2024-01-25
CN115885072B (zh) 2026-01-23
CN115885072A (zh) 2023-03-31
DE102020121627A1 (de) 2022-02-24
WO2022037832A1 (fr) 2022-02-24

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