EP3908694B1 - Protection de bord d'un habillage pour machine à papier - Google Patents

Protection de bord d'un habillage pour machine à papier Download PDF

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Publication number
EP3908694B1
EP3908694B1 EP19820703.7A EP19820703A EP3908694B1 EP 3908694 B1 EP3908694 B1 EP 3908694B1 EP 19820703 A EP19820703 A EP 19820703A EP 3908694 B1 EP3908694 B1 EP 3908694B1
Authority
EP
European Patent Office
Prior art keywords
fabric
film strip
side edges
faces
edge
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
EP19820703.7A
Other languages
German (de)
English (en)
Other versions
EP3908694A1 (fr
Inventor
Uwe Köckritz
Jens Kallenberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
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Voith Patent GmbH
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 EP3908694A1 publication Critical patent/EP3908694A1/fr
Application granted granted Critical
Publication of EP3908694B1 publication Critical patent/EP3908694B1/fr
Active legal-status Critical Current
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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
    • 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
    • D21F1/30—Protecting wire-cloths from mechanical damage
    • 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
    • D21F7/12—Drying

Definitions

  • the invention relates to a method for producing an edge protection on a clothing for a machine for producing or finishing a fibrous web, in particular a paper, cardboard or tissue web, and a clothing, in particular a drying fabric, with an edge protection produced according to this method.
  • a suspension of water and fibers is regularly applied to a forming fabric in a paper machine via a headbox. A large part of the water is removed from the suspension through the forming fabric, so that the actual fibrous web is formed.
  • Further sections of the paper machine following the forming section regularly include further clothings, which are used for further transport and further drying of the fibrous web. These are usually press felts and dryer fabrics.
  • the various coverings are mostly designed as fabrics in which crossing weft and warp threads are connected or woven together.
  • the fabrics can be single-ply or multi-ply. They can also have additional layers, such as a staple fiber layer, for example to form a press felt.
  • the coverings are usually closed to form an endless band and have two lateral edges or edges, which can also be referred to as side edges or longitudinal edges. When used as intended, they circulate at high speed over various rollers in the paper machine. In order to guide the clothing safely, guide elements are used on which the lateral edges of the clothing can run. However, the frictional forces generated in this way lead to a high load on the lateral edges of the coverings. It is therefore common practice to provide them with protection to avoid premature wear.
  • U.S. 6,503,602 B1 discloses a method for producing a corresponding edge protection by applying a monofilament web.
  • film strip in the sense of the present invention implies that the width of the film strip is significantly smaller than the width of the covering whose edges are to be protected.
  • melting in the context of the present invention means that the material of the film strip or the threads in the edge area of the covering is not completely melted, so that the film strip or the threads lose their shape, but that the Material is only partially softened by the energy input. In the case of the threads in particular, it is sufficient that these are only superficially melted.
  • the foil material on the other hand, can be softened over almost its entire thickness in order to be able to be easily pressed into the tissue. The melting, pressing in and cooling not only results in a form-fitting connection between the film strip and the fabric, but also in a material-to-material connection.
  • the side edge of the covering provided with the foil strip is then trimmed.
  • the cutting can be done either conventionally mechanically, for example by means of a so-called “disk cutter” or with more modern technologies, such as ultrasonic technology.
  • not only one of the two side edges of the fabric is provided with edge protection according to the method steps according to the invention, but both side edges.
  • the covering and the film strip are essentially formed from the same base material.
  • all weft threads and/or warp threads of the covering can be made of the same material as the foil strip.
  • foil strips which are predominantly, preferably completely, formed from PET.
  • PET is an abbreviation for the term polyethylene terephthalate.
  • good test results could be achieved if the foil strip has a width between 20 mm and 50 mm, preferably between 30 mm and 40 mm and/or the foil strip has a thickness between 50 ⁇ m and 400 ⁇ m, preferably between 100 ⁇ m and 350 ⁇ m.
  • the surface of the film strip facing the covering and the surface of the covering facing the film strip be heated by means of a jet of hot air, the jet of hot air preferably being directed into an inlet gap formed between the film strip and the covering.
  • the jet of hot air By directing the jet of hot air into the inlet gap, it can be ensured that the foil strip in particular is only partially melted on the side facing the fabric of the covering, whereas the surface of the fabric strip facing away from the fabric can remain largely solid.
  • the film strip can thus be easily pressed into the fabric of the covering by means of a pressing element, without the film strip getting caught or sticking to the pressing element.
  • the surface of the film strip facing the covering and the surface of the covering facing the film strip can be heated by means of a hot wedge.
  • the term "hot wedge” is to be understood as meaning a component which is essentially wedge-shaped and which can give off heat, for example by being electrically heated itself.
  • the flanks preferably come into contact with the surfaces to be heated, which are guided over the flanks of the hot wedge and according to the geometry of the Hot wedge run towards each other, to be then pressed against each other or pressed into each other.
  • the pressing force can be generated on the film strips applied to the surface of one of the two side edges of the covering by means of a pressure roller, with a further roller or further pressure roller or a substantially flat plate preferably being used as a counter-element to the pressure roller can be used.
  • the pressing force can be applied to the film strip applied to the surface of one of the two side edges of the covering by means of two pressure plates converging in a wedge shape, the covering together with the film strip passing through a tapering gap between the two pressure plates can be led.
  • a further aspect of the present invention relates to a covering with edge protection which has been produced using the method according to the invention described above. Effective edge protection is particularly important for dryer fabrics in order to prevent premature wear on the edges of the dryer fabrics.
  • figure 1 illustrates a first exemplary embodiment of the method according to the invention.
  • a fabric 10 for example a woven dryer fabric, with an edge protection 12
  • the fabric 10 is first stretched over two rotatably mounted rollers, namely a first stretching roller 14 and a second stretching roller 16.
  • a film strip 18, which is on a roll 20 can be wound up, applied to one of the two side edges of the covering 10 .
  • the foil strip 18 is guided over a pressure roller 22 .
  • the pressure roller 22 can be positioned or positioned in such a way that together with a counter roller 23 it exerts a predefined pressing force on the foil strip 18 when this is guided together with the covering 10 through a gap 24 between the pressure roller 22 and the counter roller 23 .
  • the pressing force on the foil strip 18 is dimensioned such that the foil strip 18 penetrates the fabric of the covering 10 essentially completely, so that the threads of the covering 10 are completely surrounded by the foil strip 18 in the area of the side edge. So that the penetration of the fabric with the film strip 18 is possible, both the fabric and the film strip 18 are previously heated so that they melt.
  • a hot air source 26 is used, which is aligned in such a way that a jet of hot air, which is figure 1 is indicated by three parallel arrows into the gap 24 is directed.
  • the amount of heat is preferably calculated in such a way that the threads in the edge area of the woven covering 10 only melt or become soft on the surface, whereas the foil strip 18 becomes soft almost over its entire thickness.
  • the method can be continued continuously until the fabric 10 is provided with the edge protection 12 along its entire circumference. Subsequently or at the same time, the opposite edge of the clothing in the cross-machine direction can also be provided with an edge protection 12 in the same way.
  • FIG 2 illustrates a second exemplary embodiment of the method according to the invention.
  • the same reference symbols refer to the same ones Components or component sections as in the embodiment in figure 1 .
  • the essential difference between the first embodiment and the second embodiment is that the pressure roller 22 does not form a gap 24 in conjunction with the counter-roller 23 through which a pressing force is exerted on the film strip 18, but instead such a gap is formed in the interaction of the Pressure roller 22 is formed with a plate 28.
  • the plate 28 can be essentially flat, ie it can have a surface facing the pressure roller 22 which is essentially flat.
  • the plate 28 preferably has an inlet bevel (at its in figure 2 left end) up. Again, position the hot air source 26 so that it directs a jet of hot air into the nip between the nip roller 22 and the platen 28.
  • FIG 3 illustrates a third exemplary embodiment of the method according to the invention.
  • the same reference numbers relate to the same components or component sections as in the embodiment in FIG figure 2 .
  • the main difference between the second embodiment and the third embodiment is that the pressure roller 22 of the second embodiment has been replaced by a further plate 30 which, in cooperation with the plate 30, forms a gap through which a pressing force is exerted on the film strip 18 .
  • the two plates 28, 30 together preferably form a tapering gap through which the covering 10 is passed together with the foil strip 18 so that the foil strip 18 is pressed into the fabric of the covering 10 or preferably penetrates it completely.
  • the hot air source 26 is positioned as in the second embodiment.
  • figure 4 shows a top view of the fabric 10 stretched over the two stretching rollers 14, 16, which is provided with a respective edge protection 12 on its two side edges.
  • the two side edges are then preferably also trimmed, for example by means of ultrasonic technology, in order to obtain smooth edges and a covering with a precisely defined width.
  • the threads of the fabric are protected so well by the positive and material connection that it is almost impossible for individual threads to come loose from the edge protection 12. Individual thread ends, which may protrude from the edge protection 12, tend to break off.

Landscapes

  • Treatment Of Fiber Materials (AREA)

Claims (11)

  1. Procédé de production d'une protection de bord (12) sur une toile (10) pour une machine de fabrication ou de finition d'une bande de matière fibreuse, notamment d'une bande de papier, de carton ou de papier mince, qui comprend les étapes suivantes :
    - la fourniture de la toile (10) à munir de la protection de bord (12), la toile (10) étant essentiellement formée d'un tissu avec des fils de trame et des fils de chaîne qui se croisent et présentant deux bords latéraux opposés,
    - l'application d'un ruban de film (18) sur une surface de l'un des deux bords latéraux de la toile (10) ; juste avant que le ruban de film (18) n'entre en contact avec la toile (10), la surface du ruban de film (18) faisant face à la toile (10) et la surface de la toile (10) faisant face au ruban de film (18) étant chauffées de telle sorte qu'elles fondent toutes les deux,
    - le fait d'exercer une force de pression sur le ruban de film (18) qui a été appliqué sur la surface de l'un des deux bords latéraux de la toile (10), de telle sorte que le ruban de film (18) pénètre au moins partiellement dans le tissu, et
    - le refroidissement du bord latéral de la toile (10) muni du ruban de film (18), de telle sorte qu'une liaison stable, notamment par liaison de matière et par accouplement de forme, se forme entre le ruban de film (18) et le bord latéral de la toile (10).
  2. Procédé selon la revendication 1, caractérisé en ce que le procédé comprend en outre l'étape suivante :
    - la découpe du bord latéral muni du ruban de film (18) .
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'autre des deux bords latéraux de la toile (10) est également muni d'une protection de bord (12) au moyen des mêmes étapes de procédé.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la toile (10) et le ruban de film (18) sont formées essentiellement à partir du même matériau de base.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le ruban de film (18) est formée principalement, de préférence entièrement, à partir de PET.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le ruban de film (18) présente une largeur comprise entre 20 mm et 50 mm, de préférence entre 30 mm et 40 mm, et/ou le ruban de film (18) présente une épaisseur comprise entre 50 µm et 400 µm, de préférence entre 100 µm et 350 µm.
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la surface du ruban de film (18) faisant face à la toile (10) et la surface de la toile (10) faisant face au ruban de film (18) sont chauffées au moyen d'un jet d'air chaud, le jet d'air chaud étant de préférence dirigé dans un espace d'entrée (24) formé entre le ruban de film (18) et la toile (10).
  8. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la surface du ruban de film (18) faisant face à la toile (10) et la surface de la toile (10) faisant face au ruban de film (18) sont chauffées au moyen d'une cale chauffante.
  9. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la force de pression sur le ruban de film (18) appliqué sur la surface de l'un des deux bords latéraux de la toile (10) est générée au moyen d'un rouleau de pression (22), un autre rouleau (23) ou une plaque essentiellement plane (28) étant de préférence utilisé en tant que contre-élément du rouleau de pression (22).
  10. Procédé selon l'une quelconque des revendications 1 à 8, caractérisé en ce que la force de pression est appliquée au ruban de film (18) appliqué sur la surface de l'un des deux bords latéraux de la toile (10) au moyen de deux plaques de pression (28, 30) convergeant l'une vers l'autre en forme de coin, la toile (10) étant guidée conjointement avec le ruban de film (18) à travers une fente qui se rétrécit entre les deux plaques de pression (28, 30).
  11. Toile (10) pour une machine de fabrication ou de finition d'une bande de matière fibreuse avec une protection de bord (12), qui a été fabriquée selon l'une quelconque des revendications précédentes, la toile (10) étant de préférence un tamis de séchage.
EP19820703.7A 2019-01-08 2019-12-09 Protection de bord d'un habillage pour machine à papier Active EP3908694B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019100268.0A DE102019100268A1 (de) 2019-01-08 2019-01-08 Kantenschutz für eine Papiermaschinenbespannung
PCT/EP2019/084203 WO2020143967A1 (fr) 2019-01-08 2019-12-09 Protection de bord d'un habillage pour machine à papier

Publications (2)

Publication Number Publication Date
EP3908694A1 EP3908694A1 (fr) 2021-11-17
EP3908694B1 true EP3908694B1 (fr) 2022-10-26

Family

ID=68887017

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820703.7A Active EP3908694B1 (fr) 2019-01-08 2019-12-09 Protection de bord d'un habillage pour machine à papier

Country Status (6)

Country Link
US (1) US11525213B2 (fr)
EP (1) EP3908694B1 (fr)
CN (1) CN113272493B (fr)
DE (1) DE102019100268A1 (fr)
PT (1) PT3908694T (fr)
WO (1) WO2020143967A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4121572C1 (fr) * 1991-06-29 1992-12-03 Fa. Ernst Siegling, 3000 Hannover, De
US5731059A (en) * 1993-04-07 1998-03-24 Wangner Systems Corporation Dryer fabric having an abrasion resistant edge
US6503602B1 (en) * 2000-07-26 2003-01-07 Astenjohnson, Inc. Dryer fabric with reinforced edges
US7074729B2 (en) * 2003-02-18 2006-07-11 Siegling America, Llc Fabric-reinforced belt for conveying food
US20100252217A1 (en) 2007-03-26 2010-10-07 Robert Eberhardt Paper machine clothing with edge reinforcement
DE102007015055A1 (de) * 2007-03-26 2008-10-02 Voith Patent Gmbh Papiermaschinenbespannung mit Randverstärkung
US8241464B2 (en) * 2008-02-01 2012-08-14 Albany International Corp. Papermaking clothing defining a width of a paper web and associated system and method

Also Published As

Publication number Publication date
EP3908694A1 (fr) 2021-11-17
CN113272493A (zh) 2021-08-17
WO2020143967A1 (fr) 2020-07-16
CN113272493B (zh) 2023-07-21
US20220120037A1 (en) 2022-04-21
DE102019100268A1 (de) 2020-07-09
US11525213B2 (en) 2022-12-13
PT3908694T (pt) 2022-12-27

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