EP1015688B1 - Verbesserungen beim pressband für breit-nip-pressen - Google Patents

Verbesserungen beim pressband für breit-nip-pressen Download PDF

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Publication number
EP1015688B1
EP1015688B1 EP98942876A EP98942876A EP1015688B1 EP 1015688 B1 EP1015688 B1 EP 1015688B1 EP 98942876 A EP98942876 A EP 98942876A EP 98942876 A EP98942876 A EP 98942876A EP 1015688 B1 EP1015688 B1 EP 1015688B1
Authority
EP
European Patent Office
Prior art keywords
strips
matrix
yarns
reinforcing yarns
membrane
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
EP98942876A
Other languages
English (en)
French (fr)
Other versions
EP1015688A1 (de
Inventor
Ian Christison Sayers
John Jeffery
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 Fabrics Heidenheim GmbH and Co KG
Original Assignee
Voith Fabrics Heidenheim GmbH and Co KG
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Filing date
Publication date
Application filed by Voith Fabrics Heidenheim GmbH and Co KG filed Critical Voith Fabrics Heidenheim GmbH and Co KG
Publication of EP1015688A1 publication Critical patent/EP1015688A1/de
Application granted granted Critical
Publication of EP1015688B1 publication Critical patent/EP1015688B1/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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D21F3/0227—Belts or sleeves therefor
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D21F3/0227—Belts or sleeves therefor
    • D21F3/0236—Belts or sleeves therefor manufacturing methods

Definitions

  • This invention relates to improvements in extended nip press belts.
  • Extended nip dewatering presses are used in the press section of the paper making process, following forming of the paper web on a forming wire, to remove excess water from the paper web before the paper web is passed to a drying stage of the paper making process.
  • the paper web is in intimate contact with one or two moisture-absorbing felts, moves in pressure contact with a press roll and is urged into such contact by a pressure shoe acting through a belt in contact with the outermost (in relation to the press roll) of the moisture absorbing felts.
  • the belt is used to provide a low or zero friction passage of the web and felt(s) through the nip.
  • These belts generally comprise structured reinforcing yarns or a membrane which may be perforated, embedded in a matrix of a suitable plastics material and may be provided with ribbing for example on the surface which contacts the press felt to form grooves which carry away water squeezed from the paper web and the press felt in the nip.
  • a membrane which is effectively a mesh of machine-direction and cross machine direction strips and incorporating machine direction reinforcement yarns is embedded in a matrix of a thermoset polyurethane material, which extends through the apertures in the membrane and forms layers above and below the membrane.
  • a thermoset polyurethane material which extends through the apertures in the membrane and forms layers above and below the membrane.
  • two mesh membranes may be overlayed, with the strips of one membrane being set at an angle relative to those of the other so that the grid of one membrane is set on the machine direction and cross machine axes, whilst the grid of the other is set obliquely to the machine direction
  • a non-woven fabric which is applicable to a range of uses, including a press felt substrate, wherein the fabric is cast in strips having reinforcing yarns extending longitudinally of the strips, and holes formed in the membrane by means of teeth on the casting surface.
  • CA-A-2068800 indicates that it is known to form a press belt from overlaid strips which cross each other both being arranged obliquely relative to the machine direction but at opposed angles and discloses a variant wherein strips are overlaid at a small oblique angle to the machine direction of the order of 2°-5°, the strips in the upper layer being offset by half a strip width with respect to the strips of the lower layer.
  • This belt is considered to lack cross-directional rigidity and the strips are made by a slow and cumbersome weaving technique.
  • Spiral-link reinforced belts have been proposed, eg incorporating a spiral link substrate of cross-machine direction connecting wires, about which are looped flattened helical coils linking each respective pair of wires and interdigitated with the next adjacent coils embedded in a suitable plastics matrix.
  • These have proven to be problematical due to poor bonding between the polyurethane matrix and the polyester spiral link fabric.
  • the only alternative materials for making spiral link fabrics PEEK and PPS are however too expensive to be considered a viable option for solving this problem of incompatibility.
  • An object of this invention is to provide a new extended nip press belt which achieves a much greater bonding between the matrix material and the reinforcing structure or membrane.
  • a press belt comprises a coarse mesh composite membrane comprising reinforcing yarns extending in at least one direction in a plastics matrix, the membrane being formed as or into strips and the strips being joined along their longitudinal edges, the strips being arranged such that the reinforcing yarns extend substantially in the cross machine direction of the belt and embedded in a further matrix also including further reinforcing yarns extending substantially in the machine direction of the belt.
  • the invention also comprises a method of manufacturing a press belt, comprising forming a coarse mesh composite membrane incorporating reinforcing yarns extending in at least one direction in a plastics matrix, forming the membrane into or as strips with the reinforcing yarns extending longitudinally of the strips, joining the strips along their longitudinal edges, the strips being arranged such that the reinforcing yarns extend substantially in the cross-machine direction of the belt and feeding matrix polymer to cast the strips with further reinforcing yarns extending in substantially the machine direction of the belt.
  • the strips may be formed by melting their longitudinal edges and allowing the edges to fuse together and then cooled to allow the fused regions to set.
  • the matrix polymer of the strips and/or the completed felt is preferably polyurethane and the reinforcing yarns may be multi filament yarns selected from for example polyester, polyamide, PEEK, PPS, PBO, aramid, glass, carbon or steel. However, monofilament, or twisted, braided or plied yarns may be used. Some or all of the yarns may be coated, for example with an elastomer such as TPU.
  • figs. 1 and 2 are diagrammatic sections, substantially at right angles to each other, through a completed press belt fabric according to the invention.
  • the press belt comprises a substrate or support layer 10, comprising a plurality of reinforcing yarns 11 extending substantially in the cross machine direction, wherein a matrix 12 of polyurethane, which has an array of apertures 13 which may be formed by casting the layer 10 on a studded or pinned drum, as known for example from GB-A-2202893.
  • the layer 10 is either divided into a plurality of strips, or cast in the form of strips 14 which as shown in fig.2 are laid side by side, extending across the width of the belt, and their edges are joined by melting together to form fusion joints 15.
  • the layer 10 is then covered or embedded in a further matrix 16, in which are embedded further reinforcing yarns 17, which run approximately at right angles to the reinforcing yarns 11 in the support layer 10, that is extending in the machine direction longitudinally of the finished belt.
  • the upper surface of the matrix 16 may, in known manner, be provided with grooves 18 to lead expressed water away from the nip.
  • Fig. 3 illustrates one form of substrate 10 useable in the invention substantially according to WO 92/02677, wherein a grid or mesh membrane 20, comprises longitudinal and transverse members with included apertures.
  • This membrane 20 also has reinforcing yarns 21 extending along one set of the longitudinal or transverse members, and the grid is set in a matrix 22 of eg polyurethane which extends substantially above and below the membrane.
  • Fig.4 illustrates a fragment of another form of membrane 30, with reinforcing yarns 31 embedded in a plastics matrix 32, and having circular holes 33 extending through the membrane 30 from one face to the other.
  • This membrane is substantially as described in GB-A-2202893, without the fibrous batt layer added in that disclosure.
  • the membrane eg according to fig.3 or fig.4 is either formed as strips or cut into strips and then laid circumferentially about a form 40 with pins 41 to enter holes such as 31 in the membrane eg as in fig.5 and abutting edge regions are melted and fused with the addition of further polymer to join the edges together thereby fabricating a continuous belt composed of an array of such strips extending widthwise across the belt, joined edge to edge.
  • the belt substrate After formation of the belt substrate it is placed on a further machine as in fig.6 to cast a matrix layer over the substrate.
  • the substrate is passed as a continuous belt over end rollers 60, 61 one of which 60 is adjustable to vary tension.
  • a plurality of reinforcing yarns 62 are fed in the direction of belt travel from a supply 63 onto the upper surface of the substrate.
  • Matrix material 64 such as polyurethane is fed onto the belt between moulding belts 65 and 66 to embed the yarns 62 and encapsulate the substrate and reinforcing yarns in a matrix to provide a structure of the type illustrated in figs. 1 and 2 above.
  • the matrix polymers are typically polyurethane and the reinforcing yarns may be multifilament yarns such as polyester, nylon, PEEK, PPS, PBO, aramid, glass, carbon or steel, although monofilament yarns or even twisted, braided or plied yarns may be used. At least some of the yarns may be coated, preferably with an elastomer such as TPU.
  • Press belts made by the method of the invention have a number of advantages including improved delamination and crack resistance due to improved bonding between the polyurethane matrix and the polyurethane or TPU membrane, in addition to optimised bonding between the matrix and the added running direction reinforcing yarns. Regular structure is also maintained due to there being no sagging of the cross-direction yarns.
  • the reinforcing structure can be closer to the centre of the belt for better strength properties and for protection against wear from the presser shoe side of the belt.
  • a monocoque, fully encapsulated reinforcing structure is obtained to protect against wear, eliminate air bubble formation and improve delamination resistance.

Claims (14)

  1. Naßpressengurt mit mindestens einer grobmaschigen Verbundstoffmembrane (20, 30), die erste Verstärkungsfäden (11) umfaßt, die sich in mindestens einer Richtung in einer Kunststoffmatrix (12) erstrecken, wobei die Membrane (30) als oder in Form von Streifen (14) ausgebildet ist und die Streifen (14) entlang ihrer Längskanten verbunden sind, wobei die Streifen (14) derart angeordnet sind, daß sich die ersten Verstärkungsfäden (11) im wesentlichen in Maschinenquerrichtung des Gurtes erstrecken und in eine weitere Matrix (16) eingebettet sind, die ebenfalls mindestens eine Lage von weiteren Verstärkungsfäden (17) enthält, die sich im wesentlichen in Maschinenrichtung des Gurtes erstrecken.
  2. Naßpressengurt nach Anspruch 1,
    wobei die erste Kunststoffmatrix (12) und/oder die weitere Matrix (16) aus wärmehärtbaren und/oder thermoplastischen Materialien hergestellt sind.
  3. Naßpressengurt nach Anspruch 2,
    wobei die Material ein Polyurethan ist.
  4. Naßpressengurt nach Anspruch 1, 2 oder 3,
    wobei die ersten Verstärkungsfäden (11) und/oder die weiteren Verstärkungsfäden (17) Multifilamentfäden aus einem Material sind, das aus Polyester, Polyamid, PEEK, PPS, PBO, Aramid, Glas, Kohlenstoff oder Stahl ausgewählt wurde.
  5. Naßpressengurt nach Anspruch 1, 2 oder 3,
    wobei die ersten und/oder die weiteren Verstärkungsfäden (11, 17) Monofilamentgarne, eindrähtigen Zwirn, geflochtene Garne oder Mehrfachzwirn umfaßt.
  6. Naßpressengurt nach Anspruch 4 oder 5,
    wobei mindestens einige der Verstärkungsfäden (11, 17) mit einem Elastomer beschichtet sind.
  7. Naßpressengurt nach einem vorhergehenden Anspruch,
    wobei die Membrane (20, 30) perforiert ist.
  8. Naßpressengurt nach einem vorhergehenden Anspruch,
    wobei die weitere Matrix (16) auf beiden Seiten der Membrane (20, 30) aufgebracht ist und sich durch die Öffnungen der Membrane (20, 30) erstreckt, so daß eine selbsttragende Schalenstruktur gebildet ist.
  9. Naßpressengurt nach einem vorhergehenden Anspruch,
    wobei die Papierseite der Matrix (16) mit Rillen (18) versehen ist.
  10. Naßpressengurt nach Anspruch 1,
    wobei die Membrane (20, 30) und die weiteren Verstärkungsfäden (17) in einem schrägen Winkel von 1 bis 5° zueinander ausgerichtet sind.
  11. Naßpressengurt nach Anspruch 9,
    wobei sich die Rillen (18) in Maschinenrichtung des Gurtes erstrecken.
  12. Verfahren zur Herstellung eines Naßpressengurtes mit den Verfahrensschritten: Ausbilden mindestens einer grobmaschigen Verbundstoffmembrane (20, 30) mit Verstärkungsfäden (11), die sich in mindestens einer Richtung in einer Kunststoffmatrix (12) erstrecken, Ausbilden der Membrane (20, 30) in Form von oder als Streifen, wobei sich die Verstärkungsfäden in Längsrichtung der Streifen erstrecken, Verbinden der Streifen (14) entlang ihrer Längskanten, wobei die Streifen (14) derart angeordnet sind, daß sich die Verstärkungsfäden (11) im wesentlichen in Maschinenquerrichtung des Gurtes erstrecken, und Zuführen von Matrixpolymer, um die Streifen (14) mit mindestens einer Lage von weiteren Verstärkungsfäden (17) zu vergießen, die sich im wesentlichen in Maschinenrichtung des Gurtes erstrecken.
  13. Verfahren nach Anspruch 12,
    wobei das Matrixpolymer und die weiteren Verstärkungsfäden (17) gleichzeitig auf die verbundenen Streifen (14) aufgegossen werden.
  14. Verfahren nach Anspruch 12,
    wobei das Matrixpolymer und die weiteren Verstärkungsfäden (17) nacheinander auf die verbundenen Streifen (14) aufgegossen werden.
EP98942876A 1997-09-18 1998-09-10 Verbesserungen beim pressband für breit-nip-pressen Expired - Lifetime EP1015688B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9719748 1997-09-18
GBGB9719748.7A GB9719748D0 (en) 1997-09-18 1997-09-18 Improvements in extended nip press belts
PCT/GB1998/002735 WO1999014426A1 (en) 1997-09-18 1998-09-10 Improvements in extended nip press belts

Publications (2)

Publication Number Publication Date
EP1015688A1 EP1015688A1 (de) 2000-07-05
EP1015688B1 true EP1015688B1 (de) 2002-05-22

Family

ID=10819197

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98942876A Expired - Lifetime EP1015688B1 (de) 1997-09-18 1998-09-10 Verbesserungen beim pressband für breit-nip-pressen

Country Status (8)

Country Link
EP (1) EP1015688B1 (de)
JP (1) JP2001516820A (de)
AT (1) ATE217924T1 (de)
CA (1) CA2304072A1 (de)
DE (1) DE69805532T2 (de)
ES (1) ES2178251T3 (de)
GB (1) GB9719748D0 (de)
WO (1) WO1999014426A1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3408416B2 (ja) * 1998-02-26 2003-05-19 市川毛織株式会社 シュープレス用ベルト及びその製造法
JP3698984B2 (ja) 2000-11-10 2005-09-21 ヤマウチ株式会社 シュープレス用ベルト
GB0204310D0 (en) * 2002-02-23 2002-04-10 Voith Fabrics Heidenheim Gmbh Edge balanced belt
US7014733B2 (en) 2002-05-14 2006-03-21 Stowe Woodward L.L.C. Belt for shoe press and shoe calender and method for forming same
DE102005045429A1 (de) * 2005-09-23 2007-03-29 Voith Patent Gmbh Papiermaschinenbespannung
FI118227B (fi) * 2005-10-14 2007-08-31 Tamfelt Oyj Abp Puristinhihna
JP6716550B2 (ja) 2014-11-06 2020-07-01 ボルボトラックコーポレーション 制動装置及び取付部材
DE102019126077A1 (de) * 2019-09-27 2021-04-01 Voith Patent Gmbh Pressmantel, dessen Verwendung sowie Presswalze und Schuhpresse

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9016619D0 (en) * 1990-07-28 1990-09-12 Scapa Group Plc Endless belts for extended nip dewatering presses
DE4340344A1 (de) * 1993-11-26 1994-04-07 Voith Gmbh J M Preßband für eine Preßeinrichtung, insbesondere für die Papierfabrikation
GB2287484A (en) * 1994-03-15 1995-09-20 Scapa Group Plc Belt for long nip dewatering presses

Also Published As

Publication number Publication date
CA2304072A1 (en) 1999-03-25
DE69805532D1 (de) 2002-06-27
JP2001516820A (ja) 2001-10-02
EP1015688A1 (de) 2000-07-05
ATE217924T1 (de) 2002-06-15
ES2178251T3 (es) 2002-12-16
WO1999014426A1 (en) 1999-03-25
DE69805532T2 (de) 2003-01-09
GB9719748D0 (en) 1997-11-19

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