EP0416213B1 - Process for making flexible impermeable bands - Google Patents

Process for making flexible impermeable bands Download PDF

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Publication number
EP0416213B1
EP0416213B1 EP90109598A EP90109598A EP0416213B1 EP 0416213 B1 EP0416213 B1 EP 0416213B1 EP 90109598 A EP90109598 A EP 90109598A EP 90109598 A EP90109598 A EP 90109598A EP 0416213 B1 EP0416213 B1 EP 0416213B1
Authority
EP
European Patent Office
Prior art keywords
band
bands
fabric
mixture
fabric band
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
EP90109598A
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German (de)
French (fr)
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EP0416213A1 (en
Inventor
Werner Schön
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.)
F Oberdorfer Siebtechnik GmbH
Original Assignee
F Oberdorfer Siebtechnik GmbH
OBERDORFER F SIEBTECH GmbH
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Publication date
Application filed by F Oberdorfer Siebtechnik GmbH, OBERDORFER F SIEBTECH GmbH filed Critical F Oberdorfer Siebtechnik GmbH
Publication of EP0416213A1 publication Critical patent/EP0416213A1/en
Application granted granted Critical
Publication of EP0416213B1 publication Critical patent/EP0416213B1/en
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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/901—Impermeable belts for extended nip press

Definitions

  • the invention relates to a process for the production of impermeable, flexible, elastic tapes with a smooth inside made of plastic fabrics, including spiral tapes and thread beds, in particular of press tapes or press sleeves which can be used for wet presses of paper machines provided with an extended press nip, a flowable mixture of a prepolymer , in particular polyurethane, is poured onto an endless fabric tape and connected to it, which is guided over a roller device deflecting this tape and coated with the flowable prepolymer mixture by means of at least one nozzle on the outside of the tape.
  • a flowable mixture of a prepolymer in particular polyurethane
  • a reinforcing fabric tape is guided over a roller device deflecting this tape from two rollers arranged parallel to one another and on the Coated outside or inside of the tape with a flowable prepolymer mixture.
  • the flowable mass reaches the roller surface, which can be provided with a release agent, in particular silicone oil, in order to facilitate the detachment of the coated inner side of the reinforcing fabric from the roller surface.
  • a release agent in particular silicone oil
  • the object of the invention is therefore to change the known procedure in such a way that the disadvantages mentioned are avoided and the finished coated fabric tape has a smooth, clean, homogeneously coated inside, which no longer has to be processed, and in particular the production of "hard” Tapes is enabled.
  • an elastic carrier tape is stretched over the roller device consisting of at least two parallel rollers, which has a smooth top, on which the fabric tape to be coated is stretched so that when coating the fabric tape with the flowable prepolymer mixture Slipping of the two bands in relation to each other is excluded.
  • an elastic band 1 is stretched as a carrier belt, which has a smooth top 12 and runs as an endless belt over the roller surfaces, whereby it is driven by at least one of the two rollers.
  • the tension of this carrier tape can be adjusted in that the two axes 4, 5 of the rollers are adjusted with respect to one another.
  • the fabric tape 10 to be coated is placed and also tensioned, so that no relative movement can take place between the carrier tape and the fabric tape, while both tapes run in this superposition in the direction of the arrow over the roller surfaces.
  • the fabric tape to be coated only touches the smooth upper side of the carrier tape with its offsets.
  • a flowable prepolymer mixture is applied in a desired layer thickness 11 via a mixing head 8 and a mixing nozzle 9, so that the pores or meshes of the fabric tape are penetrated by the coating material and the coating mass reaches the smooth upper side 12 of the carrier tape 1 and the Completely and essentially homogeneously covers the top of the opposite surface of the fabric tape, the coating material also gets under the cranks of the fabric tape before it hardens.
  • the thickness of the coating-side coating from the coating composition can be adjusted within certain limits by changing the fabric tension of the fabric tape. Such a change in tension is effected in that the two rollers 2, 3 are adjusted with respect to one another. It goes without saying that the amount of coating composition penetrating the meshes or pores of the fabric band also depends on the viscosity of the composition and can therefore be controlled within certain limits by adjusting the viscosity.
  • the coating thickness 11 that is to say the height of the coating composition on the fabric strip
  • the coating thickness 11 can also be set so that, after the coating composition has cooled and hardened, the top side of the fabric strip can be given desired structures, for example grooves and bores, by means of mechanical processing, while the inside of the Fabric tape does not have to be processed, since it is smooth and, moreover, its nature fully meets the presses.

Abstract

The invention relates to a method for the manufacture of impermeable, flexible, elastical bands having a smooth inner surface and consisting of a plastic fabric, including spiral bands and mats of threads, which bands are especially suited for use in connection with an extended nip of wet presses of paper making machines. These bands are used as press bands or press coates and are manufactured by applying a mixture of a prepolymer, especially polyurethane, in a flowable consistence to an endless fabric band and joining that mixture thereto, which band is transported over a reverting roll device and is coated by means of at least one nozzle on its outer surface with the flowable prepolymer mixture. In order to improve the known method which is provided with drawbacks the invention proposes to spread over the at least parallel and distantly arranged rolls of the roll device an elastic carrier band having a smooth upper surface onto which the fabric band which is to be coated is tensioned in such a way that during the coating of the fabric band with the flowable prepolymer mixture the two bands cannot slip with respect to one another.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von undurchlässigen, biegsamen, elastischen Bändern mit glatter Innenseite aus Kunststoff-Geweben, einschließlich Spiralbändern und Fadengelegen, insbesondere von für mit einem verlängerten Preßspalt versehene Naßpressen von Papiermaschinen verwendbaren Preßbändern bzw. Preßmänteln, wobei eine fließfähige Mischung eines Prepolymers, insbesondere Polyurethans, auf ein endloses Gewebeband aufgegossen und mit diesem verbunden wird, das über eine dieses Band umlenkende Walzeneinrichtung geführt wird und mittels wenigstens einer Düse auf der Bandaußenseite mit der fließfähigen Prepolymermischung beschichtet wird.The invention relates to a process for the production of impermeable, flexible, elastic tapes with a smooth inside made of plastic fabrics, including spiral tapes and thread beds, in particular of press tapes or press sleeves which can be used for wet presses of paper machines provided with an extended press nip, a flowable mixture of a prepolymer , in particular polyurethane, is poured onto an endless fabric tape and connected to it, which is guided over a roller device deflecting this tape and coated with the flowable prepolymer mixture by means of at least one nozzle on the outside of the tape.

Bei einem bekannten Verfahren dieser Art (DE-OS 3801850) wird ein Armierungsgewebeband über eine dieses Band umlenkende Walzeneinrichtung aus zwei mit Abstand parallel zueinander angeordneten Walzen geführt und auf der Bandaußenseite oder Innenseite mit einer fließfähigen Prepolymer-Mischung beschichtet. Bei dieser Beschichtung gelangt die fließfähige Masse auf die Walzenoberfläche, die mit einem Trennmittel, insbesondere Silikonöl, versehen werden kann, um das Ablösen der beschichteten Armierungsgewebebandinnenseite von der Walzenoberfläche zu erleichtern. Diese Verfahrensweise ist im Hinblick auf die notwendige Beschichtung der Walzen, die verhindern soll, daß das aushärtende Polymerisat auf der Walzenoberfläche hängen bleibt, aufwendig und führt auch noch trotz dieser Maßnahmen in vielen Fällen dazu, daß die auf diese Weise beschichtete Trägerbandinnenseite keine homogene Beschichtung aufweist.In a known method of this type (DE-OS 3801850), a reinforcing fabric tape is guided over a roller device deflecting this tape from two rollers arranged parallel to one another and on the Coated outside or inside of the tape with a flowable prepolymer mixture. With this coating, the flowable mass reaches the roller surface, which can be provided with a release agent, in particular silicone oil, in order to facilitate the detachment of the coated inner side of the reinforcing fabric from the roller surface. This procedure is complex in view of the necessary coating of the rollers, which is intended to prevent the curing polymer from getting stuck on the roller surface, and despite these measures also leads in many cases to the fact that the inside of the carrier tape coated in this way does not have a homogeneous coating .

Die Aufgabe der Erfindung besteht deshalb darin, die bekannte Verfahrensweise so abzuändern, daß die genannten Nachteile vermieden werden und das fertig beschichtete Gewebeband eine glatte, saubere, homogen beschichtete Innenseite aufweist, die nicht mehr bearbeitet werden muß, und daß insbesondere die Herstellung "harter" Bänder ermöglicht wird.The object of the invention is therefore to change the known procedure in such a way that the disadvantages mentioned are avoided and the finished coated fabric tape has a smooth, clean, homogeneously coated inside, which no longer has to be processed, and in particular the production of "hard" Tapes is enabled.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß über die aus wenigstens zwei parallelen Walzen bestehende Walzeneinrichtung ein elastisches Trägerband gespannt wird, das eine glatte Oberseite aufweist, auf die das zu beschichtende Gewebeband so aufgespannt wird, daß bei der Beschichtung des Gewebebandes mit der fließfähigen Prepolymermischung ein Verrutschen der beiden Bänder in bezug aufeinander ausgeschlossen ist.This object is achieved in that an elastic carrier tape is stretched over the roller device consisting of at least two parallel rollers, which has a smooth top, on which the fabric tape to be coated is stretched so that when coating the fabric tape with the flowable prepolymer mixture Slipping of the two bands in relation to each other is excluded.

Vorteilhafte Ausgestaltungen des erfindungsgemäßen Verfahrens sind in den Unteransprüchen gekennzeichnet.Advantageous embodiments of the method according to the invention are characterized in the subclaims.

Die Erfindung wird nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels einer Vorrichtung zur Bandherstellung näher erläutert.The invention is explained in more detail below on the basis of an exemplary embodiment of a device for strip production shown in the drawing.

Auf die Oberflächen 6 und 7 der beiden mit Abstand parallelen Walzen 2, 3, die auf den Achsen 4 und 5 sitzen, wird ein elastisches Band 1 als Trägerband aufgespannt, das eine glatte Oberseite 12 aufweist und als Endlosband über die Walzenoberflächen läuft, wobei es von wenigstens einer der beiden Walzen angetrieben wird. Die Spannung dieses Trägerbandes läßt sich dadurch einstellen, daß die beiden Achsen 4, 5 der Walzen in bezug aufeinander verstellt werden.On the surfaces 6 and 7 of the two parallel spaced rollers 2, 3, which sit on the axes 4 and 5, an elastic band 1 is stretched as a carrier belt, which has a smooth top 12 and runs as an endless belt over the roller surfaces, whereby it is driven by at least one of the two rollers. The tension of this carrier tape can be adjusted in that the two axes 4, 5 of the rollers are adjusted with respect to one another.

Auf das Trägerband 1 wird das zu beschichtende Gewebeband 10 aufgelegt und ebenfalls gespannt, so daß zwischen dem Trägerband und dem Gewebeband keine Relativbewegung stattfinden kann, während beide Bänder in dieser Übereinanderlage in Richtung des Pfeils über die Walzenoberflächen laufen. Dabei berührt in der Regel das zu beschichtende Gewebeband die glatte Oberseite des Trägerbandes nur mit seinen Kröpfungen.On the carrier tape 1, the fabric tape 10 to be coated is placed and also tensioned, so that no relative movement can take place between the carrier tape and the fabric tape, while both tapes run in this superposition in the direction of the arrow over the roller surfaces. As a rule, the fabric tape to be coated only touches the smooth upper side of the carrier tape with its offsets.

Auf die Außenseite des Gewebebandes wird über einen Mischkopf 8 und eine Mischdüse 9 eine fließfähige Prepolymermischung in einer gewünschten Schichtdicke 11 aufgetragen, so daß die Poren oder Maschen des Gewebebandes von der Beschichtungsmasse durchdrungen werden und letztere auf die glatte Oberseite 12 des Trägerbandes 1 gelangt und die Oberseite der gegenüberliegenden Oberfläche des Gewebebandes vollständig und im wesentlichen homogen abdeckt, wobei die Beschichtungsmasse auch unter die Kröpfungen des Gewebebandes gelangt, bevor sie aushärtet.On the outside of the fabric tape, a flowable prepolymer mixture is applied in a desired layer thickness 11 via a mixing head 8 and a mixing nozzle 9, so that the pores or meshes of the fabric tape are penetrated by the coating material and the coating mass reaches the smooth upper side 12 of the carrier tape 1 and the Completely and essentially homogeneously covers the top of the opposite surface of the fabric tape, the coating material also gets under the cranks of the fabric tape before it hardens.

Die Dicke des trägerbandseitigen Überzugs aus der Beschichtungsmasse läßt sich durch Veränderung der Gewebespannung des Gewebebandes in gewissen Grenzen einstellen. Eine solche Spannungsveränderung wird dadurch bewirkt, daß die beiden Walzen 2, 3 in bezug aufeinander verstellt werden. Es versteht sich, daß die die Maschen oder Poren des Gewebebandes durchdringende Menge an Beschichtungsmasse auch von der Viskosität der Masse abhängt und deshalb durch Einstellung der Viskosität in gewissen Grenzen steuerbar ist.The thickness of the coating-side coating from the coating composition can be adjusted within certain limits by changing the fabric tension of the fabric tape. Such a change in tension is effected in that the two rollers 2, 3 are adjusted with respect to one another. It goes without saying that the amount of coating composition penetrating the meshes or pores of the fabric band also depends on the viscosity of the composition and can therefore be controlled within certain limits by adjusting the viscosity.

Die Beschichtungsdicke 11, also die Höhe der Beschichtungsmasse auf dem Gewebeband, läßt sich bekanntermaßen auch einstellen, so daß nach dem Erkalten und Aushärten der Beschichtungsmasse die Oberseite des Gewebebandes mittels mechanischer Bearbeitung gewünschte Strukturen, beispielsweise Rillen und Bohrungen, erhalten kann, während die Innenseite des Gewebebandes nicht bearbeitet werden muß, da sie glatt ist und im übrigen ihre Beschaffenheit den Pressen vollständig gerecht wird. Somit enfällt ein Wenden des fertig beschichteten Gewebebandes, so daß diese Verfahrensweise die Herstellung "harter" Bänder ermöglicht, also Bänder, deren Wenden bisher erhebliche Schwierigkeiten bereitet hat bzw. gänzlich unmöglich gewesen ist.As is known, the coating thickness 11, that is to say the height of the coating composition on the fabric strip, can also be set so that, after the coating composition has cooled and hardened, the top side of the fabric strip can be given desired structures, for example grooves and bores, by means of mechanical processing, while the inside of the Fabric tape does not have to be processed, since it is smooth and, moreover, its nature fully meets the presses. This means that there is no need to turn the finished coated fabric tape, so that this procedure enables the production of "hard" tapes, ie tapes whose turning has hitherto caused considerable difficulties or has been completely impossible.

Claims (4)

  1. A method of manufacturing liquid impermeable, flexible, elastic press bands having a smooth inner surface consisting of plastic fabric, including spiral bands and mets of threads, especially for the use in connection with wet presses of paper making machines having an extended nip, comprising pouring a flowable mixture of a prepolymer, especially polyurethane, onto an endless fabric band and joining that mixture thereto, which fabric band is transported over a roll device turning back the fabric band and is coated on its outer surface by means of at least one nozzle with the free flowing prepolymer mixture, characterized in that an elastic carrier band is drawn over the roll device consisting of at least two parallel rolls, which carrier band having a smooth upper surface onto which the fabric band which is to be coated is put under tension so that during the coating of the fabric band with the flowable prepolymer mixture slippage between the two bands with respect to one another is avoided.
  2. Method according to claim 1, characterized in that the fabric band is put under tension so onto the smooth upper surface of the carrier band that the fabric band is contacting the upper surface only by its knuckles.
  3. Method according to claim 1 or 2, characterized in that the prepolymer mixture is applied to the fabric band to be coated in such a way that its pores or meshes are penetrated by the coating material passing onto the smooth upper surface of the carrier band and covering that surface of the fabric band opposite to the said upper surface completely and in an essentially homogenious manner and that the mixture is curing thereafter.
  4. Method according to one of the claims 1 to 3, characterized in that the thickness of the coating material formed by the prepolymer mixture on the carrier band is adjusted by changing the tension of the fabric band.
EP90109598A 1989-09-07 1990-05-21 Process for making flexible impermeable bands Expired - Lifetime EP0416213B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3929820 1989-09-07
DE3929820A DE3929820C1 (en) 1989-09-07 1989-09-07

Publications (2)

Publication Number Publication Date
EP0416213A1 EP0416213A1 (en) 1991-03-13
EP0416213B1 true EP0416213B1 (en) 1994-08-03

Family

ID=6388866

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Application Number Title Priority Date Filing Date
EP90109598A Expired - Lifetime EP0416213B1 (en) 1989-09-07 1990-05-21 Process for making flexible impermeable bands

Country Status (7)

Country Link
US (1) US5132141A (en)
EP (1) EP0416213B1 (en)
JP (1) JP2598559B2 (en)
AT (1) ATE109531T1 (en)
DE (2) DE3929820C1 (en)
ES (1) ES2058671T3 (en)
FI (1) FI98717C (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4020589A1 (en) * 1990-06-28 1992-01-09 Oberdorfer Fa F Coated press band for paper making machines - has core fabric with flattened warp and/or weft threads
US5171389A (en) * 1991-11-08 1992-12-15 Albany International Corp. Spiral construction of grooved long nip press
EP0659934A3 (en) 1993-12-14 1995-09-06 Appleton Mills Press belt or sleeve, incorporating an open base carrier for use in long nip presses, and method of making same.
EP0658649A1 (en) 1993-12-14 1995-06-21 Appleton Mills Press belt or sleeve incorporating a spiral-type base carrier for use in long nip presses
US6124015A (en) * 1996-04-18 2000-09-26 Jwi Ltd. Multi-ply industrial fabric having integral jointing structures
US5753085A (en) * 1996-06-11 1998-05-19 Albany International Corp. Textile substrate for a long nip press belt
JP3342375B2 (en) * 1997-10-20 2002-11-05 市川毛織株式会社 Blanket for shoe press
US6174825B1 (en) 1997-12-09 2001-01-16 Albany International Corp. Resin-impregnated belt for application on papermaking machines and in similar industrial application
DE19754631C1 (en) * 1997-12-09 1998-12-10 Scapa Forming Gmbh Shoe press mantle
FI103209B2 (en) † 1998-01-02 2005-04-04 Valmet Corp Method for surface coating of press or conveyor belts and corresponding surface-coated belt
US6752908B2 (en) 2001-06-01 2004-06-22 Stowe Woodward, Llc Shoe press belt with system for detecting operational parameters
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
JP3795002B2 (en) * 2002-10-04 2006-07-12 ヤマウチ株式会社 Elastic sleeve for shoe press, method for producing elastic sleeve for shoe press, and shoe press roll
US7011730B2 (en) * 2002-12-30 2006-03-14 Albany International Corp. Structure for process belt
US20040234716A1 (en) * 2003-05-21 2004-11-25 Madden Michael D. Method for forming endless belt
US20050003724A1 (en) * 2003-07-02 2005-01-06 Fitzpatrick Keith Substrate for endless belt for use in papermaking applications
US7303656B2 (en) * 2003-07-02 2007-12-04 Albany International Corp. Low permeability textile substrate for a two-sided coated product
US7011731B2 (en) * 2003-07-02 2006-03-14 Albany International Corp. Long nip press belt made from thermoplastic resin-impregnated fibers

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US3592709A (en) * 1967-06-27 1971-07-13 Owens Corning Fiberglass Corp Drive belt construction
US3673024A (en) * 1969-03-06 1972-06-27 Nordiska Maskinfilt Ab Method for the manufacture of endless drive belts and conveyor bands
GB1498040A (en) * 1974-08-21 1978-01-18 Fenner Co Ltd J H Belting and similar articles
US4288475A (en) * 1979-10-22 1981-09-08 Meeker Brian L Method and apparatus for impregnating a fibrous web
DE3318984A1 (en) * 1983-05-25 1984-11-29 Fa. F. Oberdorfer, 7920 Heidenheim MANUFACTURING PROCESS FOR TENSION-RESISTANT, IMPERMEABLE, BENDABLE TAPES, IN PARTICULAR FOR PRESSES FOR THE DRAINAGE OF FIBER FIBER STRIPS
US4552620A (en) * 1983-09-19 1985-11-12 Beloit Corporation Paper machine belt
US4787946A (en) * 1987-08-07 1988-11-29 Albany International Corp. Method of making a paper machine press belt
DE3801850A1 (en) * 1988-01-22 1989-07-27 Oberdorfer Fa F METHOD AND DEVICE FOR THE PRODUCTION OF STRONG STABILITY, LIQUID-IMPERMEABLE, BENDABLE PRESSING BANDS, IN PARTICULAR FOR WET PRESSING OF PAPER MACHINES
DE3827486A1 (en) * 1988-08-12 1990-02-15 Oberdorfer Fa F Process and apparatus for producing extensibly stable, liquid-impermeable, flexible pressing belts, in particular for wet presses of paper machines

Also Published As

Publication number Publication date
EP0416213A1 (en) 1991-03-13
FI98717C (en) 1997-08-11
JP2598559B2 (en) 1997-04-09
FI98717B (en) 1997-04-30
FI904411A0 (en) 1990-09-07
DE59006677D1 (en) 1994-09-08
DE3929820C1 (en) 1990-12-13
ATE109531T1 (en) 1994-08-15
US5132141A (en) 1992-07-21
JPH0399836A (en) 1991-04-25
ES2058671T3 (en) 1994-11-01

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