EP3990695A1 - Habillage enroulé - Google Patents

Habillage enroulé

Info

Publication number
EP3990695A1
EP3990695A1 EP20735284.0A EP20735284A EP3990695A1 EP 3990695 A1 EP3990695 A1 EP 3990695A1 EP 20735284 A EP20735284 A EP 20735284A EP 3990695 A1 EP3990695 A1 EP 3990695A1
Authority
EP
European Patent Office
Prior art keywords
layer
strips
covering
another
fibrous web
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20735284.0A
Other languages
German (de)
English (en)
Inventor
Reinhard Holl
Cedric FITZER
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 EP3990695A1 publication Critical patent/EP3990695A1/fr
Withdrawn legal-status Critical Current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
    • D21F1/0081—Screen-cloths with single endless strands travelling in generally parallel convolutions
    • 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

Definitions

  • the invention relates to a clothing for a machine for producing a fibrous web, in particular a paper, cardboard or tissue web, comprising a first layer of first strips oriented parallel to one another and a second layer of one another arranged on the first layer and connected to the first layer parallel oriented second stripe.
  • the invention also relates to a manufacturing method for such a covering.
  • a fibrous suspension is first applied to a forming wire in a forming section.
  • the suspension which initially contains predominantly water
  • the actual fibrous web is formed on the forming fabric.
  • the forming section is followed by further sections in the machine, namely usually at least one press section and a drying section, in which further moisture is extracted from the fibrous web by mechanical pressure and / or heat before the finished product can be wound up at the end of the machine .
  • endless coverings are provided that transport the fibrous web and are permeable for the purpose of dehumidifying them.
  • the coverings are mostly made by interweaving thermoplastic monofilaments, but other manufacturing processes are also known.
  • the coverings can also be designed as spiral screens or as perforated, in particular laser-drilled, foils.
  • the coverings can also be produced in such a way that threads or strips are wound up helically over two rollers with parallel longitudinal axes, the side edges of the threads or strips being firmly connected to one another and / or at least one further layer of helically wound threads or to stabilize the structure Strip is applied to the first layer and connected to this.
  • Such a covering is known, for example, from patent specification EP 1 354 094 B1.
  • the disadvantage of such a covering is that the manufacturing process is relatively complex, since a large number of perforations must finally be made in the covering in order to give the covering the necessary permeability.
  • this object is achieved by a generic covering described at the beginning, which is particularly characterized in that both adjacent first strips are spaced apart and adjacent second strips are spaced apart, so that the composite of the first layer and second layer has a plurality of through openings for dewatering the fibrous web.
  • the clothing according to the invention is also used as a forming fabric or as a press felt in the machine.
  • the advantages of the present invention come into play particularly well when the covering according to the invention is used as a dryer fabric.
  • the dryer fabric consists essentially exclusively of the first Layer and second layer is formed, that is, has no further layers or layers.
  • the winding process also eliminates the need for seam elements, as the covering already has an endless shape during manufacture. If necessary, however, the wound covering can also be separated and subsequently provided with a seam element, for example to enable the covering to be inserted more easily into the machine. Under certain circumstances, reinforcements in the edge area of the covering are also necessary.
  • the wound structure When used as a press felt, however, the wound structure must also be provided with at least one further layer or layer, in particular a felt layer, so that the press felt can fulfill its intended function. Further precautions must also be taken with a forming fabric, since the wound structure alone otherwise entails the risk of forming undesired markings in the fibrous web.
  • the first strips have a first angle to the cross-machine direction of the clothing, which is greater than 0 ° and less than 90 ° and preferably between 45 ° and 80 °, and that the second strips have a second angle to the cross-machine direction Have covering, which is greater than 90 ° and less than 180 ° and is preferably between 100 ° and 135 °.
  • the machine direction of a clothing corresponds to its longitudinal direction, i.e. the direction in which the clothing moves in the machine when it is used as intended.
  • the cross-machine direction is the direction which is oriented in the plane of the clothing orthogonal to the machine direction.
  • the second angle corresponds essentially to 180 ° minus the first angle.
  • the first strips run in the plane of the clothing with respect to the machine direction, mirror-symmetrical to the second strips.
  • the first strips and the second strips can absorb the tensile forces acting on the clothing in the machine direction to the same extent.
  • the first strips have an essentially rectangular cross-sectional shape with a first thickness and a first width and that the second strips have an essentially rectangular cross-sectional shape with a second thickness and a second width.
  • the width is measured in the plane of the covering and the thickness is orthogonal to it.
  • the first thickness can differ from the second thickness.
  • the layer of the first layer and the second layer facing the fibrous web in normal use has strips with a smaller thickness than the layer facing away from the fibrous web in normal use.
  • the layer facing away from the fibrous web can primarily provide structural stability due to its greater thickness, while the layer facing the fibrous web due to its smaller thickness provides only a slight unevenness for the contact surface with the fibrous web.
  • the first width essentially corresponds to the second width, the first width and the second width preferably having a value between 1 mm and 30 mm, more preferably between 1 mm and 15 mm. These widths have proven to be particularly advantageous when using the clothing according to the invention as a dryer fabric.
  • the through-openings can have an essentially rectangular, preferably diamond-like shape, with all through-openings formed in this way preferably having essentially the same shape.
  • the “shape of the through openings” is to be understood as the shape that appears when looking at the covering orthogonally to the plane of the covering.
  • the first strips and the second strips can be cohesively connected to one another, in particular welded to one another. This results in a secure hold between the strips of the two layers.
  • a welded connection can be made using hot air, a hot wedge, ultrasound or hot presses be achieved.
  • a material connection can additionally or alternatively also be established by means of an adhesive.
  • the first strips and the second strips can be connected to one another by laser welding, for example by means of an NIR laser.
  • the first strips have a property that absorbs radiation from a laser, in particular an NIR laser, which is different from the second strips.
  • the laser light can radiate through one of the two layers without being significantly absorbed, while the other layer absorbs the laser light, melts it and, when it cools down, creates the integral weld joint under the appropriate pressure.
  • an auxiliary material such as ClearWeld®, for example, can of course also be introduced between the intersection points of the first strips and the second strips prior to irradiation with the laser light in order to produce the laser-absorbing effect there specifically. If the laser beam is directed directly into a gap between the first strip and the second strip to be connected to it, both strips can also have an equally large laser light-absorbing property, in particular be colored black.
  • the strips are preferably formed essentially from a plastic, in particular from a meltable thermoplastic plastic.
  • a plastic in particular from a meltable thermoplastic plastic.
  • undrawn material can be used.
  • the first strips and / or the second strips are either made from monoaxially stretched plastic or from biaxially stretched plastic, preferably a biaxially stretched film cut into the shape of the strips or consist of a plastic which is provided with fillers and / or reinforcing fibers to increase strength.
  • “Monaxially stretched” means that the polymer chains of the plastic are already given a preferred direction due to tensile forces, and in extreme cases they are all oriented in the same direction.
  • the strips can be provided with fillers and / or reinforcing fibers to increase strength. These can, for example, be introduced into the strips during extrusion or they can be coextruded with the material. Aramid or glass fibers, for example, are conceivable here.
  • first strips and / or the second strips additionally have perforations, in particular laser-drilled perforations, the perforations preferably being smaller than the through openings.
  • the present invention also relates to a method for lowering a previously described fabric according to the invention, comprising the following steps: a) lowering the first layer by winding a first spiral-like strip over two rollers that have longitudinal axes parallel to one another, whereby a gap is formed between the turns of the first layer so that the side edges of the first strip do not touch each other, and b) felling of the second layer on the first layer by winding a second strip helically over the two rollers, with between A gap is formed between the turns of the second layer so that the side edges of the second strip do not touch each other, the strips of the two layers crossing each other in such a way that the composite of the first layer and the second layer has a plurality of through openings for draining the fibrous web .
  • each layer depending on the length of the covering and the selected winding angle, has a structure that consists of several separate strips, even if the production of each layer can be done by just a single strip.
  • the first layer is materially connected to the second layer, preferably welded, more preferably laser welded, the connection optionally during the production of the second layer in step b) or as a separate step c) takes place following step b).
  • a robot arm that winds the second strips over the first strips can simultaneously irradiate the intersections with laser light in order to produce the welded connection.
  • the welding is preferably carried out on a base, such as a large drum or roller. Similar techniques are known from the manufacture of large pressure tank containers.
  • FIGS. 1 to 3. An exemplary embodiment of the covering according to the invention and the manufacturing method according to the invention for such a covering are described in more detail below with reference to FIGS. 1 to 3. Show:
  • FIG. 1 shows a plan view in the viewing direction orthogonal to the plane of the covering of a fictitious section of the same, which illustrates the structural design
  • Figure 2 is a cross-sectional view of a first strip
  • Figure 3 is a cross-sectional view of a second strip
  • FIG. 4 shows a schematic view to illustrate the production process, the production of the first layer by helical winding over two rollers being shown here; and
  • FIG. 5 is a schematic view like FIG. 4, but from a different one
  • FIG. 1 a fictitious section of a clothing 10 according to the invention, in particular a dryer fabric, is shown schematically, the viewing direction being oriented orthogonally to the plane in which the clothing 10 lies.
  • the machine direction MD of the clothing 10 points upwards in FIG. 1 or runs in the vertical direction, whereas the cross machine direction CD of the clothing 10 in FIG. 1 points to the right or is oriented in the horizontal direction.
  • the covering 10 is essentially formed from a first layer 12, which can face away from the fibrous web when the covering 10 is used as intended in the paper machine, and a second layer 22 arranged on the first layer 12 and firmly connected to it, which in the intended use Use of the clothing 10 in the paper machine can face the fibrous web.
  • the first layer 12 consists of a plurality of first strips 14, which are all oriented parallel to one another, with immediately adjacent first strips 14 being spaced apart from one another in such a way that their side edges 16, 18 do not touch one another.
  • the first strips 14 are oriented at an angle ⁇ to the cross machine direction CD, which here can be, for example, 70 °.
  • the second layer 22 consists of a plurality of second strips 24, which are also all oriented parallel to one another, with immediately adjacent second strips 24 being spaced from one another in such a way that their side edges 26, 28 do not touch one another.
  • the first strips 14 have an essentially rectangular cross-sectional shape, with a first thickness d1 and a first width b1.
  • the second strips 24 likewise have an essentially rectangular cross-sectional shape, with a second thickness d2 and a second width b2, as can be seen in FIG.
  • the first width b1 which can be 2.2 mm, for example, corresponds to the second width b2.
  • the first is Thickness d1, which can be 0.5 mm, for example, is somewhat greater than the second thickness d2, which can be 0.3 mm, for example.
  • the first width b1 and the second width b2 are smaller than a distance a between two adjacent first strips 14 and two adjacent second strips 24 (see FIG. 1).
  • the resulting gap or distance a between two immediately adjacent strips 14, 24 of a corresponding layer 12, 22 can be 1 mm, for example.
  • the covering 10 when used as intended, provides a large, largely flat contact surface both on the side facing away from the fibrous web and facing the drying cylinders and on the sides facing away from the fibrous web, which allows good heat transfer and thus efficient drying of the fibrous web.
  • the first strips 14 and the second strips 24 can be produced as monoaxially highly drawn monofilaments by an extrusion process from a thermoplastic material, the mold of the extruder having a corresponding rectangular shape. Furthermore, the first strips 14 and the second strips 24 have been welded to one another at their respective crossing points, preferably with an NIR laser. For this purpose, the first strips 14 and / or the second strips 24 can have a laser light-absorbing property, in particular they can be colored black.
  • FIGS. 4 and 5 schematically illustrate a possible manufacturing process for the covering 10 according to the invention from two different perspectives, only the first layer 12 of the covering 10 being shown in these two figures.
  • a first strip 14 is wound in a helical manner over two spaced apart rollers 30, 32 with parallel longitudinal axes. The winding takes place in such a way that the side edges 16, 18 of two directly adjacent turns of the first strip 14 do not touch, but are at a distance a from one another. Thus, one can clearly see their respective outer surface O in the wrapped area of the two rollers 30, 32.
  • a second strip 24 would be helically wound over the two rollers 30, 32 and over the first strip 14 of the first layer 12 to form the second layer 22.
  • the winding angle would be selected so that the diamond-shaped through openings 20 shown in FIG. 1 result.
  • the side edges of the covering 10 would be trimmed along the machine direction MD and reinforced to fix the free ends of the first strips 14 and the second strips 24.
  • the first strips 14 and / or the second strips 24 can additionally be perforated, preferably by means of a correspondingly powerful laser light source.

Landscapes

  • Treatment Of Fiber Materials (AREA)
  • Laminated Bodies (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un habillage (10) pour une machine pour la fabrication d'une bande de matériau fibreux, en particulier d'une bande de papier, de carton ou de papier-mouchoir, comprenant une première couche (12) de premières bandes (14) orientées parallèlement les unes par rapport aux autres et une deuxième couche (22), disposée sur la première couche (12) et reliée à la première couche (12), de deuxièmes bandes (24) orientées parallèlement les unes par rapport aux autres, les premières bandes adjacentes (14) étant écartées les unes des autres et les deuxièmes bandes adjacentes (24) étant également écartées les unes des autres, de telle sorte que le composite formé par la première couche (12) et la deuxième couche (22) présente une pluralité d'ouvertures de passage (20) pour la déshydratation de la bande en matériau fibreux. L'invention concerne en outre un procédé de fabrication d'un tel habillage.
EP20735284.0A 2019-06-26 2020-06-19 Habillage enroulé Withdrawn EP3990695A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019117172.5A DE102019117172A1 (de) 2019-06-26 2019-06-26 Gewickelte Bespannung
PCT/EP2020/067119 WO2020260153A1 (fr) 2019-06-26 2020-06-19 Habillage enroulé

Publications (1)

Publication Number Publication Date
EP3990695A1 true EP3990695A1 (fr) 2022-05-04

Family

ID=71401715

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20735284.0A Withdrawn EP3990695A1 (fr) 2019-06-26 2020-06-19 Habillage enroulé

Country Status (5)

Country Link
US (1) US20220259804A1 (fr)
EP (1) EP3990695A1 (fr)
CN (1) CN114026285A (fr)
DE (1) DE102019117172A1 (fr)
WO (1) WO2020260153A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6630223B2 (en) * 2001-01-26 2003-10-07 Albany International Corp. Spirally wound shaped yarns for paper machine clothing and industrial belts
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
DE202006004624U1 (de) * 2006-03-21 2006-06-01 Heimbach Gmbh & Co. Kg Filzband, insbesondere Papiermaschinenfilz
DE102008002398A1 (de) * 2008-06-12 2009-12-17 Voith Patent Gmbh Verfahren zur Herstellung eines Papiermaschinenbandes
DE102011005673A1 (de) * 2011-03-17 2012-09-20 Voith Patent Gmbh Laminiertes Endlosband

Also Published As

Publication number Publication date
US20220259804A1 (en) 2022-08-18
WO2020260153A1 (fr) 2020-12-30
CN114026285A (zh) 2022-02-08
DE102019117172A1 (de) 2020-12-31

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