EP4355948A1 - Habillage et utilisation d'un tel habillage - Google Patents

Habillage et utilisation d'un tel habillage

Info

Publication number
EP4355948A1
EP4355948A1 EP22732130.4A EP22732130A EP4355948A1 EP 4355948 A1 EP4355948 A1 EP 4355948A1 EP 22732130 A EP22732130 A EP 22732130A EP 4355948 A1 EP4355948 A1 EP 4355948A1
Authority
EP
European Patent Office
Prior art keywords
threads
longitudinal
clothing
transverse
covering
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.)
Pending
Application number
EP22732130.4A
Other languages
German (de)
English (en)
Inventor
Johann BÖCK
Jan Gallik
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 EP4355948A1 publication Critical patent/EP4355948A1/fr
Pending legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • D21F1/0036—Multi-layer screen-cloths
    • D21F1/0045—Triple layer fabrics

Definitions

  • Such a covering is known, for example, from publication WO 2008/068317 A1. Since the fabric has more first longitudinal threads than second longitudinal threads, the first longitudinal threads can be made finer than the second longitudinal threads and a particularly low-marking web material contact side can thus be provided.
  • the tensile stresses to which the fabric is exposed in the longitudinal direction can primarily be absorbed by the second longitudinal threads with a larger cross section.
  • the clothing is designed in such a way that contact with the machine occurs primarily at the contact flotations of the second transverse threads. In the case of flat-woven coverings, one speaks of so-called "weft runners".
  • the second transverse threads are therefore exposed to particular wear when the clothing is used as intended. Since the general assumption is that local wear decreases as the contact area increases, the flotations of the second transverse threads on the machine side are usually relatively long.
  • Lateral stability is important to avoid the fabric reducing its cross-machine dimension when tensioned in the machine direction.
  • the closer connection also results in a reduction in the free volume within the clothing, through which free volume unwanted trailing water is transported.
  • a reduction in the free volume within the clothing also facilitates the dewatering of the web of material transported on it. This is particularly advantageous when this web of material is a fibrous web, in particular tissue web, with a low specific basis weight.
  • the lapping of such tissue webs requires particularly fast-draining forming fabrics.
  • the generic covering is characterized in that the first longitudinal threads and the second longitudinal threads are arranged in several groups in each repeat, namely at least one first group and one second Group, wherein the first group is formed from a first longitudinal thread and a second longitudinal thread, which are arranged exactly one above the other in the thickness direction of the clothing, while the second group is formed from two first longitudinal threads and a second longitudinal thread, with none of the two longitudinal threads of the second group is arranged in the thickness direction of the clothing just above the first longitudinal thread of the second group.
  • This special arrangement of the first and second longitudinal threads means that water which has passed from the tissue web through the first fabric layer can also flow relatively easily and directly through the second fabric layer. This promotes rapid drainage.
  • first longitudinal threads and the second longitudinal threads are dimensioned and arranged relative to one another in such a way that, viewed projected in the thickness direction of the fabric, they form at least one free longitudinal stripe within a repeat, with such a stripe preferably being formed everywhere where individual groups adjoin each other.
  • “arranged exactly one above the other” means that the first longitudinal thread—viewed projected in the thickness direction of the clothing—should not protrude laterally beyond the second longitudinal thread. Smaller displacements that may occur locally should be disregarded here, however.
  • a mutually different number of first and second groups is preferably provided in each repeat. Since the first and second groups have a different dewatering and thus marking behavior from one another, it has been shown that the different number of first and second groups in the repeat can produce an irregularity in the marking pattern, making the markings significantly less visible. In addition, this configuration offers the possibility of influencing the dewatering behavior of the wire. It is therefore proposed in an advantageous development of this idea of the invention that the number in the covering of the first groups differs from the number of the second group. For example, using more first groups than second groups can create a wire with higher dewatering capacity than using more second groups than first. Conversely, if more second groups than first groups are used, this has the advantage that the wire provides more points of support for the fibrous web.
  • the appearance of the fibrous web in particular a tissue web
  • the appearance of the fibrous web can be specifically influenced with this type of arrangement of the first and second longitudinal threads in different groups, in particular via the interactions of the diagonally directed and longitudinally directed hydraulic markings.
  • hydraulic marking refers to a disturbance in the homogeneous flow of the white water through the wire during dewatering and sheet formation, caused by the presence of the longitudinal and transverse threads and their thread crossings.
  • the second transverse threads form a maximum of six contact flotations on the machine contact side in each repeat. As a rule, between two and four such contact flotations per repeat are sufficient.
  • binding threads always run in pairs next to one another in the transverse direction of the clothing, preferably continuing a weaving pattern alternately on the web material contact side.
  • Such coverings are also referred to in the professional world as SSB screens, the abbreviation SSB standing for "sheet support binder”.
  • the first fabric layer has a plain weave.
  • the binding threads contribute to the weaving pattern of the first layer can should.
  • the plain weave is preferably achieved not only by the first longitudinal and the first transverse threads alone, but also by the binding threads, which more preferably also extend substantially in the transverse direction of the fabric.
  • the first fabric layer it is also possible for the first fabric layer to have a different weave, in particular a 3-shaft twill weave or 4-shaft twill weave or a weave derived therefrom. This is particularly advantageous when a certain structuring of the fibrous web is even desired, such as in the case of tissue webs.
  • the binding threads can essentially have the same diameter as the first transverse threads and/or the first longitudinal threads. The term "substantially" is in this
  • the second fabric layer which does not come into contact with the web of material, can have a plain weave or a twill weave.
  • the twill weave is characterized by the fact that a slanting ridge can be seen on it. This ridge can continue anywhere over the entire fabric without interruptions, so that in this case one speaks of a regular, uninterrupted twill weave, or it can have certain deviations, in particular interruptions or offsets, so that in such a case one speaks of a broken or interrupted twill weave. Both types of twill weave have been found to work well for the present invention
  • Regular twill weaves result in thinner fabrics than broken twill weaves because disruptions in the twill weave result in a greater level of flotation in this area.
  • Regular twill weaves can reproduce the diagonal formed by them in the dewatered fibrous web via hydraulic interaction, which is advantageous if a structured fibrous web is desired.
  • Broken twill ridges are generally less hydraulically formed in the dewatered fibrous web. Multi-ridge twills with different twill ridge widths can also optimize the hydraulic marking potential. It should be noted that the binding threads are generally not taken into account when defining the weave pattern of the second layer, unlike the weave pattern of the first layer.
  • two adjacent contact flotations of a second transverse thread are separated from one another by a maximum of two second longitudinal threads. Due to the many crossing points in the second fabric layer, its thickness can be relatively small and the second longitudinal threads can also be protected from wear. In particular, it can be achieved that the second fabric layer is relatively flat, ie that there are no significant projections on the web contact side either, which would be exposed to particular wear.
  • Another aspect of the present invention relates to the use of an above-described fabric according to the invention for the production of a tissue web, the advantages of the fabric according to the invention being particularly evident when the tissue web has a low specific basis weight, i.e. a specific basis weight of at most 30 g/m 2 preferably between 8 g/m 2 and 30 g/m 2 .
  • the clothing according to the invention is advantageously used as a forming fabric in a so-called crescent former of a tissue machine.
  • FIG. 1 shows a schematic representation of a first embodiment of a clothing according to the invention in cross section, which has three contact flotations of length two, two and one per repeat;
  • FIG. 2 shows a schematic representation of only the first and second longitudinal yarns of FIG. 1 arranged in groups
  • FIG. 3a shows the weaving pattern of a first variant of the second layer of the fabric from FIG. 1 with a regular, uninterrupted twill weave
  • FIG. 3b shows the weaving pattern of a second variant of the second layer of the fabric from FIG. 1, with an interrupted twill weave;
  • FIG. 4 shows the weaving pattern as in FIG. 3a, but with slightly different numbering
  • FIG. 5 shows the complete weaving paths of all threads running in the transverse direction of the clothing, including the binding threads, of the clothing according to the invention according to FIG. 4 within a repeat;
  • FIG. 6 shows the weaving pattern of the second layer of a second embodiment of the fabric according to the invention, which has four contact flotations per repeat, each with a length of one, with a plain weave;
  • FIG. 7 shows the complete weaving paths of all threads running in the transverse direction of the clothing, including the binding threads, of the clothing according to the invention according to FIG. 6 within a repeat;
  • FIG. 8 shows the weaving pattern of the second layer of a third embodiment of the fabric according to the invention, which has four contact flotations with lengths two, one, two and one per repeat, with a regular, uninterrupted twill weave;
  • FIG. 9 shows the weaving pattern of the second layer of a fourth embodiment of the fabric according to the invention, which has four contact flotations with lengths two, two, two and one per repeat, with a regular, uninterrupted twill weave;
  • FIG. 1 shows a schematic representation of a first embodiment of a clothing 10 according to the invention in cross section.
  • the sectional plane shown is defined by the clothing transverse direction CD and the thickness direction T.
  • This embodiment is particularly distinguished by the fact that it has three contact flotations KF1, KF2 and KF3 per repeat, which respectively have the length two, two and one.
  • FIG. 1 shows a first fabric layer L1 providing a web contact side (top in FIG. 1) and a second fabric layer L2 arranged underneath and providing a machine contact side (bottom in FIG. 1).
  • the two fabric layers L1 and L2 are connected to one another by pairs of binding threads extending essentially in the transverse direction CD of the fabric.
  • the first fabric layer L1 includes first transverse threads QF1, which are interwoven with first longitudinal threads LF1. As shown in FIG. 1, the first transverse threads QF1 can be interwoven with the first longitudinal threads LF1 to form the first fabric layer L1 with a plain weave.
  • the second fabric layer L2 comprises second transverse threads QF2 interwoven with second longitudinal threads LF2.
  • the fabric 10 according to the invention also has the special feature that it comprises more first longitudinal threads LF1 than second longitudinal threads LF2, namely in this exemplary embodiment 1.5 times as many first longitudinal threads LF1 as second longitudinal threads LF2.
  • Both the first longitudinal threads LF1 and the first transverse threads QF1 have a noticeably smaller cross section than the second longitudinal threads LF2 or second transverse threads QF2. In this way, a particularly fine and low-marking paper contact surface can be provided by the first fabric layer L1, while the tensile loads that act on the covering 10 when used as intended are primarily absorbed by the second fabric layer L2.
  • the second transverse threads QF2 have flotations on the machine contact side (below in Figure 1) of the clothing 10, namely so-called contact flotations KF1, KF2 and KF3, which are all kept short, i.e. only under a second longitudinal thread or at most under two arranged directly next to one another second longitudinal threads are guided.
  • This has an advantageous effect on the lateral stability of the covering 10 .
  • the thickness of the covering 10 in the area of the contact flotations KF1, KF2 and KF3 is reduced compared to the covering with longer contact flotations known from WO 2008/068317 A1.
  • FIG. 2 shows only the first longitudinal threads LF1 and the second longitudinal threads LF2 from FIG.
  • first longitudinal threads LF1 and the second longitudinal threads LF2 are arranged in several groups G1 and G2 in each repeat, namely at least a first group G1 and a second group G2, with the first group G1 consisting of a first longitudinal thread LF1 and a second longitudinal thread LF2, which are arranged exactly one above the other in the thickness direction T of the clothing 10, while the second group G2 is formed from two first longitudinal threads LF1 and a second longitudinal thread LF2, with none of the two first longitudinal threads LF1 of the second group G2 is arranged in the thickness direction T of the clothing 10 exactly above the one second longitudinal thread LF2 of the second group G2.
  • the two groups G1 and G2 constantly alternate with one another.
  • the first longitudinal threads LF1 and the second longitudinal threads LF2 are dimensioned and arranged relative to one another in such a way that, viewed projected in the thickness direction T of the clothing 10, they form at least one free longitudinal stripe within a repeat, with such a strip preferably being formed everywhere where different groups G1 , G2 adjoin each other.
  • the free longitudinal strips facilitate drainage from the material web on the material contact side (top in FIG. 1) towards the machine contact side (bottom in FIG. 1), which is shown in FIG. 2 with dashed arrows.
  • the term “free longitudinal stripe” deliberately disregards the fact that the transverse threads, which are not shown in FIG. direction T of the clothing 10 from the web contact side of the clothing 10 to the machine contact side of the clothing 10 at least in sections in the longitudinal direction of the clothing 10 (orthogonal to the plane of the drawing in FIG. 1 or 2).
  • Figures 3a and 3b show two different variants of the weave pattern of the second layer L2 of the fabric 10 from Figures 1 and 2.
  • the columns of this chessboard-like representation of the weave pattern correspond to the second longitudinal threads LF2, whereas the rows correspond to the second transverse threads QF2.
  • the corresponding second transverse thread QF2 is guided at the top, i.e. towards the web contact side of the clothing 10, over a corresponding second longitudinal thread LF2.
  • the corresponding second transverse thread QF2 is guided under the corresponding second longitudinal thread LF2 and thus forms a contact flotation KF1, KF2 or KF3 on the machine contact side of the clothing 10.
  • the course of the weaving path of a second transverse thread QF2 namely that second transverse thread with the number 1 in the weaving pattern shown above, is shown again for illustration.
  • the two variants shown in FIGS. 3a and 3b differ from one another in that the second layer L2 in the first variant according to FIG. 3a has a regular, uninterrupted twill weave, whereas the second layer L2 in the second variant according to FIG. 3b has an interrupted one Has twill weave.
  • the ridge of the respective twill weave is indicated by a diagonal dashed line in FIGS. 3a and 3b.
  • the 12 second transverse threads QF2 of the repeat can be divided into 4 groups or sections of equal size, with each group or section taken on its own again having a regular, uninterrupted twill weave.
  • Figures 4 and 5 show the weaving pattern of the first variant according to Figure 3a in more detail, with "more detailed” here meaning that in Figure 5 the weaving paths of all threads are shown in a repeat of the covering 10, i.e. also the weaving paths of the first longitudinal threads LF1 and the first transverse threads QF1 of the first layer L1, as well as the weaving paths of the binding threads connecting the two layers L1 and L2. Accordingly, there is a different numbering of the second longitudinal threads LF2 and second transverse threads QF2 of the second layer L2 in FIG. 4 compared to FIG. 3a, with FIG. 4 otherwise corresponding to FIG. 3a.
  • every other pair of substantially transversely extending threads is a pair of tie threads, and one of the pair of tie threads is shown with a dotted line.
  • the binding threads form a plain weave on the web material contact side together with the first transverse threads QF1 and the first longitudinal threads LF1.
  • FIG. 4 shows that, also in the case of the first variant of the first embodiment, the second fabric layer L2 is a multi-ribbed twill, since there are two twilled ribs of different widths.
  • FIGS. 6 and 7 show the weaving paths of a second embodiment of the fabric according to the invention. This differs from the first embodiment primarily in that the second layer has four contact flotations per repeat, with each individual contact flotation having a length of one. The second layer thus has a plain weave.
  • the type of representation of the second embodiment corresponds to that of FIGS. 4 and 5 for the first embodiment.
  • FIGS. 8 and 9 Two further embodiments of the fabric according to the invention are shown in FIGS. 8 and 9, the representation corresponding to that in FIGS. 3a and 3b, since here too only the weaving pattern of the second layer per repeat is shown.
  • the third embodiment according to FIG. 8 is characterized in that there are four contact flotations per repeat, which have the lengths two, one, two and one.
  • the fourth embodiment according to FIG. 9, on the other hand, is characterized in that there are only three contact flotations, each of which has a length of two. Both in the third and in the fourth embodiment the second fabric layer in each case has a regular, uninterrupted multi-ridge twill weave.
  • FIGS. 10a, 10b and 11 describe a third, particularly preferred embodiment of the present invention.
  • Figures 10a and 10b show the entire course of the first transverse threads QF1, the second transverse threads QF2 and the binding threads relative to the first longitudinal threads LF1 and the second longitudinal threads LF2 in two complete repeats of the clothing 10.
  • Figures 10a and 10b are the first Transverse threads QF1, the second transverse threads QF2 and the binding threads, all of which extend in the transverse direction of the clothing, are denoted by weft 1 to weft 40, whereas the first longitudinal threads LF1 and the second longitudinal threads are simply numbered 1 to 26.
  • a complete repeat thus comprises eight first longitudinal threads LF1, namely the longitudinal threads numbered 1, 3, 4, 6, 8, 9, 11 and 13, whereas the longitudinal threads numbered 14, 16, 17 , 19, 21, 22, 24 and 26 represent only a first repetition, and five second longitudinal threads LF2, namely the longitudinal threads numbered 2, 5, 7, 10 and 12, whereas the longitudinal threads numbered 15, 18, 20 , 23 and 25 represent only a first iteration.
  • first longitudinal threads LF1 to second longitudinal threads LF2 is equal to 8:5. This distinguishes the third embodiment from the first two embodiments where this ratio was 3:2. This allows particularly fine surfaces to be formed on the web material contact side. Similar to what was described in FIG. 4 for the first embodiment, FIG.
  • every second transverse thread QF2 of a complete repeat of the second layer L2 has two contact flotations, namely one of length 1 and one of length 2.
  • the second transverse threads QF2 with the number 2 according to the top line in the chessboard-like representation above.
  • the second layer L2 has a regular, uninterrupted twill weave, although the widths of the ridges differ from one another. So this is also a multi-ridge body.

Landscapes

  • Woven Fabrics (AREA)

Abstract

L'invention concerne un habillage (10), en particulier une toile de formation, pour une machine de fabrication ou de traitement d'un matériau en bande, en particulier d'une bande de tissu, comprenant une première couche de tissu (L1) qui fournit un côté de contact avec le matériau en bande et qui est formée par le tissage de premiers fils longitudinaux (LF1) s'étendant dans la direction longitudinale de l'habillage conjointement avec des premiers fils transversaux (QF1) s'étendant dans la direction transversale de l'habillage (CD), et une seconde couche de tissu (L2) qui fournit un côté de contact avec la machine et qui est formée par le tissage de seconds fils longitudinaux (LF2) s'étendant dans la direction longitudinale du vêtement conjointement avec des seconds fils transversaux (QF2) s'étendant dans la direction transversale de l'habillage (CD), la première couche de tissu (L1) et la seconde couche de tissu (L2) étant reliées l'une à l'autre par des fils de liaison, l'habillage (10) comportant plus de premiers fils longitudinaux (LF1) que de seconds fils longitudinaux (LF2), sachant que le nombre de premiers fils longitudinaux (LF1) est presque deux fois plus grand que le nombre de seconds fils longitudinaux (LF2), et le motif de tissage du vêtement (10) se répétant à plusieurs reprises et les seconds fils transversaux (QF2) formant à chaque répétition au moins deux aérosustentations de contact (KF1, KF2, KF3) sur le côté de contact avec la machine, toutes les aérosustentations de contact (KF1, KF2, KF3) des seconds fils transversaux (QF2) ayant au plus deux longueurs. L'invention concerne également l'utilisation d'un tel habillage (10) pour la fabrication d'une bande de tissu, les premiers fils longitudinaux (LF1) et les seconds fils longitudinaux (LF2) de chaque répétition étant disposés en plusieurs groupes (G1, G2), à savoir au moins un premier groupe (G1) et un second groupe (G2), le premier groupe (G1) étant formé d'un premier fil longitudinal (LF1) et d'un second fil longitudinal (LF2), qui sont superposés avec précision dans le sens de l'épaisseur (T) de l'habillage (10), tandis que le second groupe (G2) est formé de deux premiers fils longitudinaux (LF1) et d'un second fil longitudinal (LF2), aucun des deux premiers fils longitudinaux (LF1) du second groupe (G2) n'étant superposé avec précision au second fil longitudinal (LF2) du second groupe (G2) dans le sens de l'épaisseur (T) de l'habillage (10).
EP22732130.4A 2021-06-14 2022-06-03 Habillage et utilisation d'un tel habillage Pending EP4355948A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021115275.5A DE102021115275A1 (de) 2021-06-14 2021-06-14 Papiermaschinenbespannung und Verwendung einer solchen Bespannung
PCT/EP2022/065176 WO2022263208A1 (fr) 2021-06-14 2022-06-03 Habillage et utilisation d'un tel habillage

Publications (1)

Publication Number Publication Date
EP4355948A1 true EP4355948A1 (fr) 2024-04-24

Family

ID=82117690

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22732130.4A Pending EP4355948A1 (fr) 2021-06-14 2022-06-03 Habillage et utilisation d'un tel habillage

Country Status (4)

Country Link
EP (1) EP4355948A1 (fr)
CN (1) CN117500973A (fr)
DE (1) DE102021115275A1 (fr)
WO (1) WO2022263208A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008068317A1 (fr) 2006-12-08 2008-06-12 Voith Patent Gmbh Ruban tissu pour une machine destinée à la fabrication de matériaux en bande, en particulier de papier ou de carton
US20080196784A1 (en) 2007-02-15 2008-08-21 Scott Quigley Wear side weave pattern of a composite forming fabric
US7861747B2 (en) 2008-02-19 2011-01-04 Voith Patent Gmbh Forming fabric having exchanging and/or binding warp yarns
DE102013106327B4 (de) * 2013-06-18 2015-01-08 Andritz Technology And Asset Management Gmbh Papiermaschinensieb

Also Published As

Publication number Publication date
WO2022263208A1 (fr) 2022-12-22
DE102021115275A1 (de) 2022-12-15
CN117500973A (zh) 2024-02-02

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