EP1549800B1 - Pressfilz und basisgewebe - Google Patents

Pressfilz und basisgewebe Download PDF

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Publication number
EP1549800B1
EP1549800B1 EP03798206A EP03798206A EP1549800B1 EP 1549800 B1 EP1549800 B1 EP 1549800B1 EP 03798206 A EP03798206 A EP 03798206A EP 03798206 A EP03798206 A EP 03798206A EP 1549800 B1 EP1549800 B1 EP 1549800B1
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EP
European Patent Office
Prior art keywords
yarns
seam
base fabric
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.)
Expired - Lifetime
Application number
EP03798206A
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English (en)
French (fr)
Other versions
EP1549800A1 (de
Inventor
Aimo Rautanen
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.)
Valmet Fabrics Oy
Original Assignee
Tamfelt Oy AB
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Filing date
Publication date
Application filed by Tamfelt Oy AB filed Critical Tamfelt Oy AB
Publication of EP1549800A1 publication Critical patent/EP1549800A1/de
Application granted granted Critical
Publication of EP1549800B1 publication Critical patent/EP1549800B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/10—Seams thereof

Definitions

  • the invention relates to a press felt comprising at least one base fabric, which includes a bottom side and a side facing the web to be dried and several longitudinal yarns and transverse yarns and where at least some of the longitudinal yarns are arranged to form several seam loops at a first transverse joining edge of the press felt and at a second transverse joining edge, the joining edges of the base fabric being arrangeable edge on edge to form a seam, where the seam loops of the first joining edge and the second joining edge intermesh and form a seam loop channel, into which a seam yarn connecting the joining edges can be inserted; a seam flap, which is arranged to cover the seam on the press felt surface facing the web, at least one batt fibre layer arranged at least on the base fabric surface facing the web, and the base fabric has at least a three-layer structure which comprises, in addition to the longitudinal yarns forming seam loops, at least one layer of longitudinal surface yarns on the web-side surface of the base fabric, the yarns being arranged to attach to at least some of the transverse yarns.
  • the invention further relates to a base fabric intended for a press felt, the base fabric comprising a bottom side and a web side and further: several longitudinal yarns, which are arranged to form seam loops on a first and a second transverse edge of the base fabric; and several transverse yarns, which are arranged to attach to the longitudinal yarns, and in addition to the longitudinal yarns that form seam loops, there is at least one layer of longitudinal surface yarns on the web side of the base fabric, and wherein the longitudinal surface yarns are attached to at least some of the transverse yarns.
  • the press section of the paper machine employs a press felt on one or both sides of the web to be dried, into which the water in the web is absorbed in the pressing phase.
  • the purpose is to transport the water away in the structure of the press felt without letting it back into the web.
  • the press felt comprises a base fabric which, for example, provides the felt with a necessary space for water.
  • batt fibre is needled at least onto a base fabric surface facing the paper web, the batt fibre preventing markings from being produced on the web.
  • the water retention capacity of the felt can be adjusted by means of the batt fibre.
  • the transverse edges of such felts comprise seam loops.
  • the object of the invention is to provide a novel and improved press felt and base fabric for a press felt.
  • the press felt according to the invention is characterized in that the longitudinal surface yarns are arranged to continuously extend over the seam when the base fabric is manufactured, that several additional transverse yarns are provided at the seam, the yarns being attached at least to the longitudinal surface yarns, and that the longitudinal surface yarns have been cut after the attachment of batt fibre to form a seam flap.
  • the base fabric according to the invention is characterized in that the longitudinal surface yarns extend continuously over a seam formed by seam loops on the first and the second edge, and that the area where the seam is to be formed is provided with several additional transverse yarns, which are attached at least to the longitudinal surface yarns.
  • the invention is based on the idea that the web-side surface of the base fabric is provided with at least one layer of longitudinal yarns, which are attached to the transverse yarns of the base fabric and further arranged to extend over the seam when the base fabric is manufactured. Furthermore, additional transverse yarns excessive to the rest of the structure are brought to the seam area during manufacture. These yarns join at least the surface yarns that travel over the seam. After the base fabric has been formed, one or more batt fibre layers are attached at least to its web-side surface. It is not until after this that the longitudinal surface yarns travelling over the seam are cut, whereby a seam flap which protects the seam is formed.
  • An advantage of the invention is that the seam flap protects the seam from mechanical wear. Furthermore, since the seam flap comprises both longitudinal and transverse yarns, its structure is durable and firm. The number and quality of longitudinal surface yarns as well as those of the additional transverse yarns can be easily varied to obtain a desirable base fabric without having to substantially alter the structure of the basic weave. A further advantage is that batt fibre can be attached well to the seam area since the seam flap comprises both transverse and longitudinal yarns. Thus the permeability and thickness may be substantially the same at the seam as in the other press felt sections.
  • the length of the seam flap can be implemented such that stretching of the seam loops during use is compensated for and the seam flap always provides sufficient protection for the seam.
  • An embodiment of the invention is based on the idea that the longitudinal yarns to be extended over the seam on the base fabric surface differ from the monofilaments that form seam loops in the base fabric.
  • plied yarns can be used as longitudinal surface yarns. Thanks to the structure according to the invention, the longitudinal surface yarns can be selected so as to obtain a good surface smoothness and batt fibre adherence.
  • An embodiment of the invention is based on the idea that the additional transverse yarns in the seam flap are attached to the longitudinal surface yarns by weaving.
  • An embodiment of the invention is based on the idea that the additional longitudinal yarns and longitudinal surface yarns are attached to one another by weaving, and after weaving, the attachment of the yarns is secured by melting or welding the yarns into one another. The result is a very firm and durable seam flap.
  • An embodiment of the invention is based on the idea that the additional transverse yarns attach only to the longitudinal yarns that travel over the seam.
  • the basic idea of an embodiment according to the invention is that the longitudinal yarns in the base fabric do not cross one another.
  • the longitudinal surface yarns form a layer which is independent of the rest of the structure and whose yarns can be selected relatively freely.
  • the longitudinal surface yarns do not cross the yarns forming seam loops, they do not take room between adjacent seam loops.
  • the longitudinal surface yarns have no effect on the density of the seam loops, and thus the loop density can be selected according to the need.
  • An embodiment of the invention is based on the idea that the seam flap area is provided with a special reinforced layer, such as a layer made of resin or adhesive which reinforces the structure of the seam flap.
  • press felt can be formed into a closed loop by connecting the joining edges at its transverse edges together by a seam 1.
  • the press felt may also consist of several press felt pieces joined together, in which case there are naturally several seams.
  • the press felt is run on the paper machine in the machine direction A marked in the figure.
  • the width of the press felt corresponds to that of the paper machine.
  • Figure 2 illustrates a transverse B joining edge of a press felt according to the invention.
  • the base fabric of the press felt shown in the figure has been manufactured by weaving longitudinal yarns and transverse yarns together using a suitable weave.
  • the structure comprises at least three layers, i.e. it contains three superimposed longitudinal yarns.
  • the longitudinal yarn 2 on the bottom side C of the press felt and the longitudinal yarn 3 in the middle form a seam loop 4 at the joining edge.
  • all yarns 2 and 3 at the bottom and in the middle form seam loops but in some cases some of the longitudinal yarns may not form seam loops.
  • the longitudinal yarns 2 and 3 at the bottom and in the middle bind to transverse yarns 5.
  • the web-side surface D there is a longitudinal surface yarn 6, which also binds to the transverse yarns 5 in the weave.
  • the longitudinal surface yarn 6 clearly extends further than the seam loops in direction A in the embodiment shown in Figure 2.
  • the longitudinal surface yarns 6 may be cut approximately at the seam loops.
  • the seam 1 area is provided with a sufficient number of additional transverse yarns 7, which attach to the longitudinal surface yarns 6.
  • the materials, cross sections and yarn types of the additional yarns 7 and longitudinal surface yarns 6 can be selected independently of the rest of the base fabric structure.
  • the longitudinal yarns 2 and 3 that form seam loops 4 are typically made of monofilaments but the longitudinal surface yarns 6 as well as the additional yarns 7 may also be made of plied fibre, for example.
  • Batt fibre is much easier to attach to yarns made of plied fibre and to a weave structure formed from them.
  • the longitudinal surface yarns 6 and additional yarns 7 form together a seam flap 8, which protects the seam 1.
  • the seam flap 8 is a press felt part which has substantially the same width as the press felt and whose one transverse edge is attached to the rest of the press felt structure when the other transverse edge is free.
  • on the web-side surface D of the press felt there is at least one layer of batt fibre 11.
  • the batt fibre is attached to the base fabric 10 by needling.
  • the seam flap 8 may be provided with one or more reinforcing layers 12, which makes the seam flap firm and affects its permeability.
  • the reinforcing layer 12 may be a perforated film, a resin layer, an adhesive layer or another material layer applied by spreading, spraying, injecting or by means of a roller, for example.
  • the base fabric may be treated with an ultrasonic device or heated at least in the seam area, in which case the longitudinal surface yarns 6 and additional yarns 7 join one another.
  • a suitable material can be selected for the yarns 6 and 7 by taking the treatment in question into account.
  • the yarns 6 and 7 may be fusible yarns', for instance.
  • FIG 3 illustrates part of a base fabric 10 according to the invention.
  • a seam yarn 13 which connects the joining edges together, has been inserted into the seam loop channel formed by the seam loops 4.
  • the longitudinal surface yarns 6 are arranged to extend over the seam 1.
  • a point where the longitudinal surface yarns 6 can be cut e.g. in the transverse direction to form a seam flap is marked in the figure with reference number 14.
  • the cutting is performed after the necessary batt fibre layers have been attached to the base fabric 10. This is advantageous since batt fibre makes the structure stable, in which case there is no risk that the longitudinal surface yarns 6 will slip inside the weave basic structure after cutting and thus shorten the length of the seam flap to be formed.
  • the discontinuity caused in the weave structure by the seam loops 4 can be sealed and supported with additional yarns 7.
  • FIG 3 further illustrates an alternative cutting point 14', which is clearly outside the seam area 1.
  • a relatively long seam flap 8 is formed in the base fabric. This flap compensates for the discontinuity caused by the seam 1 over a longer section.
  • the free edge of the seam flap can be, if necessary, attached after insertion of the seam yarn by needling, stitching, melting, using an adhesive or with suitable form-locking members.
  • the transverse yarn is in position 5b instead of position 5a.
  • At least some of the additional transverse yarns 7' may also bind to the yarns 2 and 3 that form seam loops 4.
  • Figure 4 illustrates a method of manufacturing a base fabric 10, where the fabric is manufactured in one step in one weaving machine. For the sake of clarity, only a few of transverse yarns are shown.
  • the section of the fabric that forms seam loops 4 is woven into an endless structure using 'horseshoe weaving'.
  • seam loops are formed on the upper and the lower level at the right-hand edge of the fabric.
  • the figure also shows an edge yarn 15, round which the seam loops 4 are woven.
  • An upper structure is simultaneously woven into a closed loop on top of the structure forming seam loops 4.
  • This structure comprises longitudinal surface yarns 6 that extend over the seam and additional yarns 7.
  • the base fabric 10 is transferred into a needling machine, where batt fibre is attached. Then the press felt can be subjected to a thermal treatment and other necessary post-treatments. Finally, before installation in a paper machine, the longitudinal surface yarns 6 are cut and the seam is opened.
  • the longitudinal surface yarns 6 can be woven into a loop with a desired length around the structure forming seam loops 4.
  • a suitable filling material can be used as an aid in weaving, such as auxiliary yarns 16, by means of which the longitudinal surface yarns 6 can be guided in a weaving machine. This way, it is possible to form a seam flap 8' with a desired length independent of the rest of the base fabric 10 structure. This seam flap is illustrated in the figure with a broken line
  • the base fabric 10 can be formed using weave patterns other than those illustrated in the figures.
  • the longitudinal surface yarns 6 can be arranged in two or more layers and they form a seam flap 8 with the additional yarns 7.
  • the base fabric may be a yarn assembly.

Landscapes

  • Paper (AREA)
  • Cleaning Implements For Floors, Carpets, Furniture, Walls, And The Like (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Claims (7)

  1. Pressfilz, umfassend:
    mindestens ein Trägergewebe (10), das eine untere Seite (C) und eine der zu trocknenden Bahn zugekehrte Seite (D) und mehrere Längsgarne (2, 3) und Quergarne (5) umfasst und wo mindestens einige der Längsgarne (2,3) angeordnet sind, um mehrere Nahtschlaufen (4) an einem ersten querlaufenden Vei-binduilcsrand des Pressfilzes und an einem zweiten querlaufenden Verbindungsrand zu bilden, wobei sich die Verbindungsränder des Trägergewebes (10) auf Stoß anordnen lassen, um eine Naht (1) zu bilden, wo die Nahtschlaufen (4) des ersten Verbindungsrands und des zweiten Verbindungsrands kämmen und einen Nahtschlaufenkanal bilden, in den ein Nahtgarn (13), das die Verbindungsränder verbindet, eingesetzt werden kann;
    einen Nahtschlag (8), der angeordnet ist, um die Naht (1) auf der der Bahn zugekehrten Pressfilzoberfläche (D) zu bedecken,
    mindestens eine Vliesstoftfaserlage (11), die zumindest auf der der Bahn zugekehrten Trägergewebe (10) Oberfläche (D) angeordnet ist,
    und wobei das Trägergewebe (10) mindestens eine Dreilagenstruktur aufweist, die zusätzlich zu den Nahtschlaufen (4) bildenden Längsgarnen (2, 3) mindestens eine Lage von Längsoberflächengarnen (6) auf der bahnseitigen Oberfläche (D) des Trägergewebes (10) umfasst, wobei diese Garne angeordnet sind, um an mindestens einigen der Quergarne (5) zu haften,
    dadurch gekennzeichnet, dass
    die Längsobei-nächengarne (6) angeordnet sind, um sich kontinuierlich über die Naht (1) zu erstrecken, wenn das Trägergewebe (10) hergestellt ist,
    mehrere zusätzliche Quergarne (7) an der Naht (1) vorgesehen sind, wobei diese Garne zumindest an den Längsoberflächengarnen (6) anhaften, und
    die Längsoberflächsngarne (6) nach der Anbringung von Vliesstofffaser geschnitten worden sind, um den Nahtschlag (8) zu bilden.
  2. Pressfilz nach Anspruch 1, dadurch gekennzeichnet, dass das Trägergewebe (10) eine gewebte Struktur ist, die in einem Webautomaten in einer Phase gebildet ist.
  3. Pressfilz nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Struktur des Nahtschlags (8) verstärkt wird, indem sie mit mindestens einer zusätzlichen Verstärkungsmateriallage (12) versehen wird.
  4. Pressfilz nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Struktur des Nahtschlags (8) verstärkt wird, indem die Längsoberflächengarne (6) durch einen Klebstoff und/oder durch Schmelzen ihrer Materialien an die querlaufenden zusätzlichen Garne (7) angeklebt werden.
  5. Pressfilz nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet dass mindestens einige der Längsoberflächengarne (6) aus Mehrfachgarn hergestellt sind und dass die Nahtschlaufen (4) bildenden Längsgarne (2,3) Monofilamente sind.
  6. Trägergewebe, das für einen Pressfilz bestimmt ist, wobei das Trägergewebe (10) umfasst: eine untere Seite (C) und eine Bahnseite (D) und weiter:
    mehrere Längsgarne (2, 3), die angeordnet sind, um Nahtschlaufen (4) auf einem ersten und einem zweiten querlaufenden Rand des Trägergewebes (10) zu bilden; und
    mehrere Quergarne (5), die so angeordnet sind, dass sie an den Längsgarnen (2, 3) haften,
    und wobei es zusätzlich zu den Längsgarnen (2, 3), die Nahtschlaufen (4) bilden, mindestens eine Lage von Längsoberflächengarnen (6) auf der Bahnseite (D) des Trägergewebes (10) gibt,
    und wobei die Längsoberflächengarne (6) an mindestens einigen der Quergarne (5) angeklebt sind,
    dadurch gekennzeichnet, dass
    die Längsoberilächengarne (6) kontinuierlich über die Naht (1) verlaufen, die auf dem ersten und dem zweiten Rand durch die Nahtschlaufen (4) gebildet ist, und
    der Bereich, wo die Naht (1) gebildet werden soll, mit mehreren zusätzlichen Quergarnen (7) versehen ist, die mindestens an den Längsoberflächengarnen (6) haften.
  7. Trägergewebe nach Anspruch 6, dadurch gekennzeichnet, dass jedes Längsgarn (2, 3, 6) angeordnet ist, um im Trägergewebe zu laufen, so dass es die anderen Längsgarne nicht kreuzt
EP03798206A 2002-09-27 2003-09-25 Pressfilz und basisgewebe Expired - Lifetime EP1549800B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20020392U 2002-09-27
FI20020392U FI5693U1 (fi) 2002-09-27 2002-09-27 Puristinhuopa ja pohjakangas
PCT/FI2003/000698 WO2004029357A1 (en) 2002-09-27 2003-09-25 Press felt and base fabric

Publications (2)

Publication Number Publication Date
EP1549800A1 EP1549800A1 (de) 2005-07-06
EP1549800B1 true EP1549800B1 (de) 2007-09-05

Family

ID=8563376

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03798206A Expired - Lifetime EP1549800B1 (de) 2002-09-27 2003-09-25 Pressfilz und basisgewebe

Country Status (8)

Country Link
EP (1) EP1549800B1 (de)
AT (1) ATE372414T1 (de)
AU (1) AU2003266422A1 (de)
CA (1) CA2498139A1 (de)
DE (1) DE60316167T2 (de)
FI (1) FI5693U1 (de)
NO (1) NO20052066L (de)
WO (1) WO2004029357A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2618422C2 (ru) * 2012-02-10 2017-05-03 Вальмет Текнолоджиз Ой Текстильная конвейерная лента, способ ее изготовления и ее применение

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7032625B2 (en) 2003-06-24 2006-04-25 Albany International Corp. Multi-layer papermaking fabrics having a single or double layer weave over the seam
EP1808527A1 (de) 2006-01-17 2007-07-18 Voith Patent GmbH Nassfilz mit Naht und Verfahren zu dessen Herstellung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI110135B (fi) * 2000-12-18 2002-11-29 Tamfelt Oyj Abp Menetelmä puristinhuovan valmistamiseksi ja puristinhuopa

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2618422C2 (ru) * 2012-02-10 2017-05-03 Вальмет Текнолоджиз Ой Текстильная конвейерная лента, способ ее изготовления и ее применение

Also Published As

Publication number Publication date
DE60316167D1 (de) 2007-10-18
ATE372414T1 (de) 2007-09-15
EP1549800A1 (de) 2005-07-06
WO2004029357A1 (en) 2004-04-08
FI5693U1 (fi) 2003-02-13
CA2498139A1 (en) 2004-04-08
NO20052066L (no) 2005-04-27
AU2003266422A1 (en) 2004-04-19
DE60316167T2 (de) 2008-06-05
FIU20020392U0 (fi) 2002-09-27

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