EP0325134B1 - Process and apparatus for making a non-elastic, impervious and flexible pressure belt, particularly for the wet press of a paper-making machine - Google Patents

Process and apparatus for making a non-elastic, impervious and flexible pressure belt, particularly for the wet press of a paper-making machine Download PDF

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Publication number
EP0325134B1
EP0325134B1 EP89100268A EP89100268A EP0325134B1 EP 0325134 B1 EP0325134 B1 EP 0325134B1 EP 89100268 A EP89100268 A EP 89100268A EP 89100268 A EP89100268 A EP 89100268A EP 0325134 B1 EP0325134 B1 EP 0325134B1
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EP
European Patent Office
Prior art keywords
band
reinforcing
roll
press
structured
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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
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EP89100268A
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German (de)
French (fr)
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EP0325134A1 (en
Inventor
Bernhard Dr. Krenkel
Heinz Joos
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F Oberdorfer & Co KG Industriegewebe-Technik GmbH
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F Oberdorfer & Co KG Industriegewebe-Technik GmbH
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Priority to AT89100268T priority Critical patent/ATE76454T1/en
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    • 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

  • the invention relates to a method for producing stretch-stable, liquid-impermeable, flexible press belts, in particular for wet presses of paper machines, as well as a device for carrying out this method.
  • Press belts that are produced by the above-mentioned method are known from DE-OS 32 24 760. They are usually coated with a plastic by pouring, the reinforcement of the reinforcing fabric tape being partially embedded in the plastic.
  • a method of the type mentioned is known from DE-OS 33 18 984.
  • the pouring of the plastic takes place in such a way that the pouring jet strikes the reinforcing fabric band spanned onto a horizontal cylinder rotating about its longitudinal axis and thereby slowly moves parallel to the cylinder axis or in that the pouring jet is in a vertical or inclined mold is introduced, in which the reinforcing fabric tape in the form of a single or multi-layer fabric made of threads of one or more materials, such as polyamide, polyester, Kevlar, metal and the like. or mixtures thereof.
  • the invention has for its object to develop a method of the type mentioned so that such press belts, in particular wide nip press belts, which must have cavities and / or depressions for liquid removal on the side facing the press felt, can be manufactured considerably more easily, and one Specify device for performing the method.
  • This object is achieved on the process side in that the flowable prepolymer mixture is applied through a slot die to the inside of the reinforcing fabric belt facing the roller surface, and that part of the flowable prepolymer, as soon as the coated inside of the belt, due to the further transport of the belt with the surface of the belt deflecting Roller comes into contact, is pressed through the fabric openings of the band and reaches the outside of the reinforcing fabric band and at least partially coats it.
  • a device is used to carry out the method according to the invention, which is characterized in that the nozzle or nozzles are slot die, which is or are arranged above the inside of the reinforcing fabric band facing the roller surface, and in that the surface of each roller is provided with a release agent, that prevents the reinforcing fabric tape from sticking during coating on the roller surfaces.
  • the flowable prepolymer mixture is applied by means of the slot die to the inside of the reinforcing fabric tape facing the roller surface, and expediently directly into the gap formed by the roller surface and the inside of the reinforcing fabric tape, with part of the flowable prepolymer as soon as the coated inside of the tape with the surface the roller deflecting the tape comes into contact, is pressed through the fabric openings of the tape and reaches the outside of the reinforcing fabric tape and coats it.
  • the device used to carry out the method according to the invention is specified with advantageous embodiments in claims 4 to 10, wherein the wide slot nozzle is arranged above the inside of the belt so that the prepolymer applied to the surface of the belt is still flowable, caused by the injection or casting pressure of the nozzle , first reaches the inside of the belt and then, due to the contact pressure between the roll surface and the belt surface in the gusset formed by both parts, is pressed out through the fabric openings or meshes and reaches the outside of the belt.
  • a reinforcing fabric belt designated by 21 in FIG , 16, 18 are parallel, but the center distance by not shown Means can be changed in order to be able to coat different band lengths of the endless reinforcement fabric band.
  • At least one of the two rollers 15, 17 is driven so that the reinforcing fabric tape is transported in the direction of the arrow over the roller surfaces 22, 25.
  • the wide slot nozzle 20 adjoining a mixing head 19 is arranged with its product outlet opening on the inside of the reinforcing fabric belt 21 facing the roller surface 22, and in such a way that the prepolymer mixture, which is for example polyurethane, is directly in the gap formed by the roller surface 22 and the inside of the reinforcing fabric belt or gusset is injected.
  • the prepolymer mixture first reaches the inside of the belt facing the roll surface. As soon as this coated inside of the strip then comes into contact with the surface 22 of the roller 17, at least part of the still flowable prepolymer is pressed through the fabric openings or meshes of the strip onto the outside of the strip in order to coat this outside.
  • the tape coated in this way can be provided with a structure on its outside, if the structure is not developed in-house by the fact that the prepolymer mass passing through the fabric openings or meshes does not spread completely over the entire tape surface, but as a function of it Mesh size and fabric structure leaves depressions or channels, which then serve as a water storage volume for the belt side facing the felt of the wet press.
  • the reinforcing fabric tape only moves once around the rollers after it has been coated, until it reaches the starting point, that is to say the coating station, represented by the mixing head 19 and the slot die 20, in order, after curing, of the Rollers to be removed.
  • nozzles can either be arranged side by side but also one behind the other, and are fed with the coating material by one or more mixing heads.
  • profiling bodies of the type shown, for example, in FIGS. 2 and 3 can be used, which form corresponding depressions in the still plastically deformable band outside.
  • the device could easily be equipped with a sanding device, which is only indicated schematically in FIG. 1 at 23 and carries out desired sanding operations on the coated reinforcing fabric belt running beneath it.
  • such a roller can also be equipped with at least one embossing disc 24 (cf. FIG. 5), which is still flowable Presses prepolymer layer on the coated surface of the reinforcing fabric tape to desired recesses in the form of grooves, grooves and. The like to train for water drainage.
  • roller 11 shown in FIG. 2 as a profiling body
  • a profiling body in the form of a shaped plate 13, which for this purpose is provided with ribs 14, as shown in FIG. 3, which feed the pins 12 of the roller 11 fulfill.
  • the reinforcing fabric belt tension is changed by the distance between the two roller axes 16, 18 by means of a not shown here Device is enlarged or reduced.
  • the smoothing means that the depressions in the surface of the strip are only negligibly small, so the surface of the strip can be described as practically completely smooth. If such a smooth strip surface is desired from the start, no profiles are of course molded into the still flowable coating material on the reinforcing fabric strip surface.

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  • Manufacturing & Machinery (AREA)
  • Paper (AREA)
  • Coating Apparatus (AREA)

Abstract

Such press bands have, at least on their outer side facing the fibre web or the felt or felts, cavities and/or depressions for the removal of liquid which are produced by pouring a free-flowing mixture of a pre-polymer onto a continuous reinforcing woven belt and bonding it to the belt. Since the outer side of a press band coated in this way is smooth while the inner side of the band possesses the desired cavities and/or depressions for the removal of liquid, in order that the press band can be used in a wet press it must, after removal from the casting mould, first be inverted, a procedure which, especially in the case of small band diameters, is very difficult and requires a great deal of effort. <??>The invention avoids this disadvantage by arranging that, in order to manufacture the press band, the reinforcing woven band is led round one of at least two rolls which are arranged at distance in parallel one above the other or one beside the other and is coated, by means of at least one nozzle, on the outer side of the band or the inner side of the band or on both sides of the band with the free-flowing pre- polymer mixture. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von dehnungsstabilen, flüssigkeitsundurchlässigen, biegsamen Preßbändern, insbesondere für Naßpressen von Papiermaschinen gemäß dem Oberbegriff des Anspruchs 1, sowie eine Vorrichtung zur Durchführung dieses Verfahrens.The invention relates to a method for producing stretch-stable, liquid-impermeable, flexible press belts, in particular for wet presses of paper machines, as well as a device for carrying out this method.

Preßbänder, die nach dem genannten Verfahren hergestellt werden, sind aus der DE-OS 32 24 760 bekannt. Sie werden üblicherweise durch Aufgießen mit einem Kunststoff beschichtet, wobei die Armierung des Armierungsgewebebandes zum Teil in den Kunststoff eingebettet wird.Press belts that are produced by the above-mentioned method are known from DE-OS 32 24 760. They are usually coated with a plastic by pouring, the reinforcement of the reinforcing fabric tape being partially embedded in the plastic.

Ein Verfahren der eingangs erwähnten Art ist aus der DE-OS 33 18 984 bekannt. Dabei geschieht das Aufgießen des Kunststoffes in der Weise, daß der Gießstrahl auf das auf einen waagrechten, um seine Längsachse rotierenden Zylinder aufgespannte Armierungsgewebeband auftrifft und dabei sich langsam parallel zur Zylinderachse verschiebt bzw. dadurch, daß der Gießstrahl in eine senkrechte oder schrägstehende Gießform eingebracht wird, in der sich das Armierungsgewebeband in Form eines ein- oder mehrlagigen Gewebes aus Fäden eines oder mehrerer Werkstoffe, wie Polyamid, Polyester, Kevlar, Metall u.dgl. oder Gemische derselben, befindet.A method of the type mentioned is known from DE-OS 33 18 984. The pouring of the plastic takes place in such a way that the pouring jet strikes the reinforcing fabric band spanned onto a horizontal cylinder rotating about its longitudinal axis and thereby slowly moves parallel to the cylinder axis or in that the pouring jet is in a vertical or inclined mold is introduced, in which the reinforcing fabric tape in the form of a single or multi-layer fabric made of threads of one or more materials, such as polyamide, polyester, Kevlar, metal and the like. or mixtures thereof.

Diese Verfahrensweise hat den Nachteil, daß bei einem so beschichteten Preßband die Bandaußenseite glatt ist, während die Bandinnenseite die zur Flüssigkeitsabführung gewünschten Hohlräume und/oder Vertiefungen aufweist. Damit ein solchermaßen hergestelltes Preßband in einer Naßpresse eingesetzt werden kann, muß es nach dem Herauslösen aus der Gießform zunächst gewendet werden, so daß die struckturierte Bandoberfläche, die ursprünglich auf der Bandinnenseite zu finden ist, auf die Bandaußenseite gelangt bzw. die Bandinnenseite zur Bandaußenseite wird, während die glatte Oberfläche die Bandinnenseite bildet; denn bei derartigen Preßbändern dient die struckturierte Bandaußenseite zur Flüssigkeitsabführung, die der Faserstoffbahn bzw. dem oder den Filztüchern zugewandt ist.This procedure has the disadvantage that, in the case of a press belt coated in this way, the outside of the band is smooth, while the inside of the band has the cavities and / or depressions desired for liquid removal. So that a press belt produced in this way can be used in a wet press, it must first be turned after being removed from the casting mold, so that the structured belt surface, which is originally to be found on the inside of the belt, reaches the outside of the belt or the inside of the belt becomes the outside of the belt , while the smooth surface forms the inside of the belt; because with such press belts the structured belt outside serves for liquid discharge, which faces the fibrous web or the felt cloth or cloths.

Das Wenden solcher fertiggegossener Preßbänder ist jedoch insbesondere bei kleinen Banddurchmessern sehr problematisch und jedenfalls mit einem erheblichen Aufwand verbunden, wobei darüberhinaus nicht ausgeschlossen werden kann, daß das Preßband bei einem solchen Wendevorgang beschädigt wird.The turning of such pre-cast press belts, however, is very problematic, especially in the case of small belt diameters, and in any case involves considerable effort, and it cannot be ruled out that the press belt is damaged during such a turning process.

Man hat deshalb auch bereits vorgeschlagen, das Wenden des Bandes ganz zu unterlassen und die verlangten Entwässerungskanäle stattdessen in die glatte Preßbandaußenseite einzuschleifen oder einzuschneiden. Diese Herstellungsweise ist jedoch mit einem erheblichen Zeit- und Kostenaufwand verbunden.It has therefore already been proposed to completely refrain from turning the belt and instead to grind or cut the required drainage channels into the smooth outside of the press belt. However, this method of production is associated with a considerable expenditure of time and money.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs erwähnten Art so weiterzubilden, daß derartige Preßbänder, insbesondere Breitnip-Preßbänder, die auf der dem Pressenfilz zugewandten Seite Hohlräume und/oder Vertiefungen zur Flüssigkeitsabführung aufweisen müssen, erheblich einfacher hergestellt werden können, und eine Vorrichtung zur Durchführung des Verfahrens anzugeben.The invention has for its object to develop a method of the type mentioned so that such press belts, in particular wide nip press belts, which must have cavities and / or depressions for liquid removal on the side facing the press felt, can be manufactured considerably more easily, and one Specify device for performing the method.

Diese Aufgabe wird erfindungsgemäß verfahrensseitig dadurch gelöst, daß die fließfähige Prepolymermischung durch eine Breitschlitzdüse auf die der Walzenoberfläche zugewandte Innenseite des Armierungsgewebebandes aufgetragen wird, und daß ein Teil des fließfähigen Prepolymers, sobald die beschichtete Bandinnenseite aufgrund des Weitertransports des Bandes mit der Oberfläche der das Band umlenkenden Walze in Berührung tritt, durch die Gewebeöffnungen des Bandes hindurchgepreßt wird und auf die Außenseite des Armierungsgewebebandes gelangt und diese zumindest teilweise beschichtet.This object is achieved on the process side in that the flowable prepolymer mixture is applied through a slot die to the inside of the reinforcing fabric belt facing the roller surface, and that part of the flowable prepolymer, as soon as the coated inside of the belt, due to the further transport of the belt with the surface of the belt deflecting Roller comes into contact, is pressed through the fabric openings of the band and reaches the outside of the reinforcing fabric band and at least partially coats it.

Zur Durchführung des erfindungsgemäßen Verfahrens dient eine Vorrichtung, die dadurch gekennzeichnet ist, daß die Düse bzw. Düsen Breitschlitzdüsen sind, welche über der der Walzenoberfläche zugewandten Innenseite des Armierungsgewebebandes angeordnet ist bzw. sind, und daß die Oberfläche jeder Walze mit einem Trennmittel versehen ist, das ein Festkleben des Armierungsgewebebandes während der Beschichtung auf den Walzenoberflächen verhindert.A device is used to carry out the method according to the invention, which is characterized in that the nozzle or nozzles are slot die, which is or are arranged above the inside of the reinforcing fabric band facing the roller surface, and in that the surface of each roller is provided with a release agent, that prevents the reinforcing fabric tape from sticking during coating on the roller surfaces.

(Hieran schließen sich die Seiten 4 bis 12 der ursprünglichen Beschreibung mit den aus der Anlage ersichtlichen Änderungen an).(This is followed by pages 4 to 12 of the original description with the changes apparent from the attachment).

Durch diese Verfahrensweise wird die fließfähige Prepolymermischung mittels der Breitschlitzdüse auf die der Walzenoberfläche zugewandte Innenseite des Armierungsgewebebandes aufgetragen, und zwar zweckmäßigerweise direkt in den von der Walzenoberfläche und der Armierüngsgewebebandinnenseite gebildeten Spalt hinein, wobei ein Teil des fließfähigen Prepolymers, sobald die beschichtete Bandinnenseite mit der Oberfläche der das Band umlenkenden Walze in Berührung tritt, durch die Gewebeöffnungen des Bandes hindurchgepreßt wird und auf die Außenseite des Armierungsgewebebandes gelangt und diese beschichtet.With this procedure, the flowable prepolymer mixture is applied by means of the slot die to the inside of the reinforcing fabric tape facing the roller surface, and expediently directly into the gap formed by the roller surface and the inside of the reinforcing fabric tape, with part of the flowable prepolymer as soon as the coated inside of the tape with the surface the roller deflecting the tape comes into contact, is pressed through the fabric openings of the tape and reaches the outside of the reinforcing fabric tape and coats it.

Da das Hindurchpressen des fließfähigen Prepolymers durch die Gewebeöffnungen oder Maschen von der einen Seite zur anderen wesentlich von der Höhe des Anpreßdruckes abhängt, mit dem das Armierungsgewebeband auf die Walzenoberfläche gepreßt wird, hat es sich als vorteilhaft erwiesen, diesen Anpreßdruck dadurch einstellbar zu machen, daß die Gewebespannung verändert wird, beispielsweise durch Änderung des Walzenabstands.Since the pressing of the flowable prepolymer through the fabric openings or meshes from one side to the other depends essentially on the level of the contact pressure with which the reinforcing fabric tape is pressed onto the roller surface, it has proven to be advantageous to make this contact pressure adjustable in that the fabric tension is changed, for example by changing the roller spacing.

Die zur Durchführung des erfindungsgemäßen Verfahrens dienende Vorrichtung ist mit vorteilhaften Ausgestaltungen in den Ansprüchen 4 bis 10 angegeben, wobei die breitschlitzdüse über der Bandinnenseite angeordnet ist, so daß das auf die bandoberfläche aufgebrachte, noch fließfähige Prepolymer, bewirkt durch den Spritz- oder Gießdruck der Düse, zunächst auf die Bandinnenseite gelangt, um dann aufgrund des zwischen der Walzenoberfläche und der Bandoberfläche im von beiden Teilen gebildeten Zwickel entstehenden Anpreßdruckes durch die Gewebeöffnungen oder -maschen hindurch herausgepreßt zu werden und auf die bandaußenseite zu gelangen.The device used to carry out the method according to the invention is specified with advantageous embodiments in claims 4 to 10, wherein the wide slot nozzle is arranged above the inside of the belt so that the prepolymer applied to the surface of the belt is still flowable, caused by the injection or casting pressure of the nozzle , first reaches the inside of the belt and then, due to the contact pressure between the roll surface and the belt surface in the gusset formed by both parts, is pressed out through the fabric openings or meshes and reaches the outside of the belt.

Es hat sich als besonders vorteilhaft erwiesen, die Breitschlitzdüse so anzuordnen, daß die Austrittsöffnung der Düse direkt in den von dem Armierungsgewebeband und der Walze gebildeten Walzenspalt hineingerichtet ist.It has proven to be particularly advantageous to arrange the slot die such that the outlet opening of the nozzle is directed directly into the nip formed by the reinforcing fabric band and the roller.

Die Erfindung wird nachfolgend anhand der in der Zeichnung dargestellten Ausführungsbeispiele näher erläutert.The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawing.

In der Zeichnung zeigen:

  • Fig. 1 eine schematische Seiten-ansicht der erfindungsgemäßen Vorrichtung, bei der die Breitschlitzdüse auf der Unterseite des Armierungsgewebebandes im Bereich des zwischen diesem Band und der Walzenoberfläche gebildeten Spaltes angeordnet ist,
  • Fig. 2 eine schematische perspektivische Ansicht eines Profilierungskörpers in Form einer mit Stiften versehenen Walze,
  • Fig. 3 eine schematische Draufsicht auf einen Profilierungskörpers in Form eines mit Rippen versehenen Formbleches,
  • Fig. 4 eine schematische Teilseitenansicht der erfindungsgemäßen Vorrichtung gemäß des Ausführungsform nach des Fig. 1 mit einem über dem beschichteten Armierungsgewebeband im Bereich der einen Walze angeordneten Profilierungskörper in Form einer mit Stiften versehenen Walze gemäß Fig. 2, und
  • Fig. 5 eine schematische perspektivische Ansicht eines Profilierungskörpers in Form einer mit einer Prägescheibe versehenen Walze.
The drawing shows:
  • 1 is a schematic side view of the device according to the invention, in which the slot die is arranged on the underside of the reinforcing fabric band in the region of the gap formed between this band and the roll surface,
  • 2 is a schematic perspective view of a profiling body in the form of a roller provided with pins,
  • 3 shows a schematic plan view of a profiling body in the form of a shaped sheet provided with ribs,
  • 4 shows a schematic partial side view of the device according to the invention according to the embodiment according to FIG. 1 with a profiling body arranged above the coated reinforcing fabric strip in the region of the one roller in the form of a roller provided with pins according to FIG. 2, and
  • Fig. 5 is a schematic perspective view of a profiling body in the form of a roller provided with an embossing disc.

Zur Herstellung eines dehnungsstabilen, flüssigkeitsundurchlässigen, biegsamen, elastischen Preßbandes, das insbesondere für mit einem verlängerten Pressenspalt versehenen Naßpressen von Papiermaschinen geeignet ist, wird ein in Fig. 1 mit 21 bezeichnetes Armierungsgewebeband über zwei nebeneinander mit Abstand getrennte Walzen 15, 17 gespannt, deren Achsen, 16, 18 parallel liegen, wobei jedoch der Achsabstand durch nicht dargestellte Mittel verändert werden kann, um unterschiedliche Bandlängen des endlosen Armierungsgewebebandes beschichten zu können.In order to produce a stretch-stable, liquid-impermeable, flexible, elastic press belt, which is particularly suitable for wet presses of paper machines provided with an extended press nip, a reinforcing fabric belt, designated by 21 in FIG , 16, 18 are parallel, but the center distance by not shown Means can be changed in order to be able to coat different band lengths of the endless reinforcement fabric band.

Wenigstens eine der beiden Walzen 15, 17 ist angetrieben, so daß das Armierungsgewebeband in Pfeilrichtung über die Walzenoberflächen 22, 25 transportiert wird.At least one of the two rollers 15, 17 is driven so that the reinforcing fabric tape is transported in the direction of the arrow over the roller surfaces 22, 25.

Die sich an einen Mischkopf 19 anschließendes Breitschlitzdüse 20 ist mit ihrer Produktaustrittsöffnung auf der der Walzenoberfläche 22 zugewandten Innenseite des Armierungsgewebebandes 21 angeordnet, und zwar so, daß die Prepolymermischung, die beispielsweise Polyurethan ist, direkt in den von der Walzenoberfläche 22 und der Armierungsgewebebandinnenseite gebildeten Spalt oder Zwickel eingespritzt wird. Hierbei gelangt also zunächst die Prepolymermischung auf die der Walzenoberfläche zugewandte Innenseite des Bandes. Sobald diese beschichtete Bandinnenseite dann mit der Oberfläche 22 der Walze 17 in Berührung tritt, wird wenigstens ein Teil des noch fließfähigen Prepolymers durch die Gewebeöffnungen oder Maschen des Bandes hindurch auf die Bandaußenseite gepreßt, um diese Außenseite zu beschichten.The wide slot nozzle 20 adjoining a mixing head 19 is arranged with its product outlet opening on the inside of the reinforcing fabric belt 21 facing the roller surface 22, and in such a way that the prepolymer mixture, which is for example polyurethane, is directly in the gap formed by the roller surface 22 and the inside of the reinforcing fabric belt or gusset is injected. Here, the prepolymer mixture first reaches the inside of the belt facing the roll surface. As soon as this coated inside of the strip then comes into contact with the surface 22 of the roller 17, at least part of the still flowable prepolymer is pressed through the fabric openings or meshes of the strip onto the outside of the strip in order to coat this outside.

Das so beschichtete Band läßt sich auf seiner Außenseite mit einer Struktur versehen, falls die Struktur nicht von Hause aus dadurch entwickelt wird, daß sich die durch die Gewebeöffnungen bzw. -maschen hindurchtretende Prepolymermasse nicht vollständig über die gesamte Bandoberfläche ausbreitet, sondern in Abhängigkeit von der Maschenweite und Gewebestruktur Vertiefungen oder Rinnen hinterläßt, die dann als Wasserspeichervolumen für die dem Filz der Naßpresse zugewandte Bandseite dienen.The tape coated in this way can be provided with a structure on its outside, if the structure is not developed in-house by the fact that the prepolymer mass passing through the fabric openings or meshes does not spread completely over the entire tape surface, but as a function of it Mesh size and fabric structure leaves depressions or channels, which then serve as a water storage volume for the belt side facing the felt of the wet press.

Bei der in Fig. 1 dargestellten Vorrichtung, wandert das Armierungsgewebeband nach seiner Beschichtung nur einmal um die Walzen herum, bis es den Ausgangspunkt, also die Beschichtungsstation, dargestellt durch den Mischkopf 19 und die Breitschlitzdüse 20, wieder erreicht, um nach dem Aushärten von den Walzen abgenommen zu werden.In the device shown in Fig. 1, the reinforcing fabric tape only moves once around the rollers after it has been coated, until it reaches the starting point, that is to say the coating station, represented by the mixing head 19 and the slot die 20, in order, after curing, of the Rollers to be removed.

Anstelle einer einzigen Breitschlitzdüse können, ohne daß dies in der Zeichnung dargestellt ist, auch mehrere Düsen Verwendung finden, die entweder nebeneinander, aber auch hintereinander angeordnet werden können, und durch einen oder mehrere Mischköpfe mit dem Beschichtungsmaterial gespeist werden. Zur Erzeugung einer gewünschten Oberflächenstruktur für wasserabführende bzw. -speichernde Zwecke lassen sich, Profilierungskörper der beispielsweise in den Fig. 2 und 3 gezeigten Art einsetzen, die in die noch plastisch verformbare Bandaußenseite entsprechende Vertiefungen einformen.Instead of a single slot die, without this being shown in the drawing, it is also possible to use a plurality of nozzles, which can either be arranged side by side but also one behind the other, and are fed with the coating material by one or more mixing heads. To produce a desired surface structure for water-removing or water-storing purposes, profiling bodies of the type shown, for example, in FIGS. 2 and 3 can be used, which form corresponding depressions in the still plastically deformable band outside.

Für den Fall, daß die Bandaußenseite geschliffen werden müßte, könnte die Vorrichtung ohne weiteres mit einer Schleifeinrichtung ausgerüstet werden, die in Fig. 1 bei 23 nur schematisch angedeutet ist und auf dem unter ihr hinweglaufenden, beschichteten Armierungsgewebeband gewünschte Schleifvorgänge ausführt.In the event that the outside of the belt would have to be sanded, the device could easily be equipped with a sanding device, which is only indicated schematically in FIG. 1 at 23 and carries out desired sanding operations on the coated reinforcing fabric belt running beneath it.

Anstelle des in Fig. 2 und 4 dargestellten Profilierungskörpers in Form einer Walze 11, deren Oberfläche mit Stiften 12 versehen ist, läßt sich eine solche Walze auch mit wenigstens einer Prägescheibe 24 (vgl. Fig. 5) ausstatten, die sich in die noch fließfähige Prepolymerschicht auf der beschichteten Oberfläche des Armierungsgewebebandes eindrückt, um gewünschte Vertiefungen in Form von Nuten, Rillen u. dgl. für die Wasserabsführung auszubilden.Instead of the profiling body shown in FIGS. 2 and 4 in the form of a roller 11, the surface of which is provided with pins 12, such a roller can also be equipped with at least one embossing disc 24 (cf. FIG. 5), which is still flowable Presses prepolymer layer on the coated surface of the reinforcing fabric tape to desired recesses in the form of grooves, grooves and. The like to train for water drainage.

Anstelle der in Fig. 2 dargestellten Walze 11 als Profilierungskörper läßt sich beispielsweise auch ein in Form eines Formbleches 13 ausgebildeter Profilierungskörper verwenden, der zu diesem Zweck mit Rippen 14 versehen ist, wie in Fig. 3 dargestellt, die die Aufgabeder Stifte 12 der Walze 11 erfüllen.Instead of the roller 11 shown in FIG. 2 as a profiling body, it is also possible, for example, to use a profiling body in the form of a shaped plate 13, which for this purpose is provided with ribs 14, as shown in FIG. 3, which feed the pins 12 of the roller 11 fulfill.

Für den Fall, daß der Anpreßdruck zwischen den Oberflächen der beiden Walzen 15, 17 und dem Armierungsgewebeband 21 verändert werden soll, wird die Armierungsgewebebandspannung geändert, indem der Abstand der beiden Walzenachsen 16, 18 mittels einer hier nich dargestellten Vorrichtung vergrößert oder verkleinert wird.In the event that the contact pressure between the surfaces of the two rollers 15, 17 and the reinforcing fabric belt 21 is to be changed, the reinforcing fabric belt tension is changed by the distance between the two roller axes 16, 18 by means of a not shown here Device is enlarged or reduced.

Auch ist die Möglichkeit gegeben, die Beschichtungsdicke sowie die Oberfläche der Beschichtung auf dem Armierungsgewebeband 21 auf der filzzugewandten Seite durch eine in der Zeichnung nicht dargestellte Kalibrierwalze an verlangte Bedingungen anzupassen, d.h., zu vergrößern oder zu verkleinern bzw., was die Oberflächenbeschaffenheit der Beschichtung anbelangt, zu glätten oder in anderer Weise zu konditionieren, wobei das Glätten bedeutet, daß die Vertiefungen in der Bandoberfläche nur vernachlässigbar gering sind, die Bandoberfläche also als praktisch vollständig glatt zu bezeichnen ist. Falls eine solche glatte Bandoberfläche von Anfang an gewünscht wird, werden in das noch fließfähige Beschichtungsmaterial auf der Armierungsgewebebandoberfläche selbstverständlich keine Profilierungen eingeformt.There is also the possibility of adapting the coating thickness and the surface of the coating on the reinforcing fabric band 21 on the side facing the felt to a required condition by means of a calibration roller (not shown in the drawing), that is to say to increase or decrease it or in terms of the surface quality of the coating , to smooth or to condition in some other way, the smoothing means that the depressions in the surface of the strip are only negligibly small, so the surface of the strip can be described as practically completely smooth. If such a smooth strip surface is desired from the start, no profiles are of course molded into the still flowable coating material on the reinforcing fabric strip surface.

Wenn in der Zeichnung für die in Fig. 1 dargestellte Ausführungsform der erfindungsgemäßen Vorrichtung nur eine Düse als Beschichtungsmittel dargestellt ist, so bedeutet dies nicht, daß nicht auch mehrere Beschichtungsdüsen in Laufrichtung des Armierungsgewebebandes 21 hintereinander und/oder nebeneinander angeordnet sein können. Letzteres wird insbesondere dann der Fall sein, wenn anstelle einer Breitschlitzdüse mehrere Düsen anderer Austrittsöffnungskonfigurationen Verwendungfinden.If only one nozzle is shown as a coating agent in the drawing for the embodiment of the device according to the invention shown in FIG. 1, this does not mean that a plurality of coating nozzles cannot be arranged one behind the other and / or next to one another in the running direction of the reinforcing fabric belt 21. The latter will be the case in particular if several nozzles of other outlet opening configurations are used instead of one slot die.

Claims (10)

1. A process for the manufacture of stretch-resistant, liquid impermeable, flexible press bands or press coats, respectively, especially suited for dewatering presses of paper-making machines provided with an extended press nip, which press bands or press coats, respectively, are provided at least on their outer surface opposite to the fiber band or the felt fabric or felt fabrics, respectively, with hollow spaces and/or depressions for carrying off liquid, comprising pouring a flowable mixture of a prepolymer especially polyurethane onto an endless reinforcing structured band and connecting it thereto, which reinforcing structured band is guided over a roll equipment provided with at least two distantly, parallel superimposed or adjacent arranged rolls, and the surface of the band is coated by at least one nozzle with the flowable prepolymer mixture, characterized in that the flowable prepolymer mixture is applied by means of a broad slot nozzle onto the inner surface of the reinforcing structured band, and that a portion of the flowable prepolymer is pressed through the web apertures of the band to the outer surface of the reinforcing structured band for coating it, then the coated inner surface of the band contacts that surface of the roll returning the band.
2. Process according to claim 1, characterized in that the flowable prepolymer mixture is directly applied by means of the broad slot nozzle into the gap formed by the roll surface and the inner surface of the reinforcing structured band.
3. Process according to claim 1 or 2, characterized in that the pressure between the roll or rolls of the roll equipment and the reinforcing structured band is controlled by changing the tension of the web.
4. Apparatus for practising the process according to one of the claims 1 through 3, provided with a roll equipment (1) having at least two distantly, parallel, superimposed or adjacent arranged rolls (15, 17) guiding the reinforcing structured band (21) and returning it, at least one of which is driven, and further provided with a coating equipment having at least one mixing head (19) for a coating substance, especially a prepolymer, comprising at least one nozzle (20) connected thereto, the product exit opening thereof can be directed against the surface of a reinforcing structured band which can be drawn over the rolls (15, 17) in order to be coated with the polymer, characterized in that the nozzle or nozzles (20), respectively, are broad slot nozzles disposed above the inner surface of the reinforcing structured band (21) opposite to the surface (22) of the roll, and that the surface (22) of each roll (15, 17) is provided with a separating substance avoiding sticking of the reinforcing structured band on the roll surfaces during the coating operation.
5. Apparatus according to claim 4, characterized in that the distance between the rolls is adjustable.
6. Apparatus according to claim 4 or 5, characterized in that the exit opening of each broad slot nozzle (20) is directed into the roll gap formed by the reinforcing structured band (21) and the roll (17).
7. Apparatus according to one of the claims 4 - 6, characterized by a profile body (11, 13) positioned above the reinforcing structured band (21) and provided on its surface with profile elements (12, 14) engaging with the still flowable prepolymer layer on the upper surface of the reinforcing structured band which is not confronted with the surface (22) of the roll, which profile elements forming into the surface of the band a structure of holes, slots or similarly configured elements use for dissipating or storing water, respectively.
8. Apparatus according to claim 7, characterized in that the profile body (11) is a roll provided on its surface with pins (12).
9. Apparatus according to claim 7, characterized in that the profile body is a roll provided with at least one embossing disc (24).
10. Apparatus according to claim 7, characterized in that the profile body (13) is a forming sheet provided on its surface with ribs (14).
EP89100268A 1988-01-22 1989-01-09 Process and apparatus for making a non-elastic, impervious and flexible pressure belt, particularly for the wet press of a paper-making machine Expired - Lifetime EP0325134B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89100268T ATE76454T1 (en) 1988-01-22 1989-01-09 METHOD AND DEVICE FOR THE MANUFACTURE OF EXTENSION-RESISTANT, LIQUID-TIGHT, FLEXIBLE PRESS BELTS, PARTICULARLY FOR WET PRESSING OF PAPER MACHINES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3801850A DE3801850A1 (en) 1988-01-22 1988-01-22 METHOD AND DEVICE FOR THE PRODUCTION OF STRONG STABILITY, LIQUID-IMPERMEABLE, BENDABLE PRESSING BANDS, IN PARTICULAR FOR WET PRESSING OF PAPER MACHINES
DE3801850 1988-01-22

Publications (2)

Publication Number Publication Date
EP0325134A1 EP0325134A1 (en) 1989-07-26
EP0325134B1 true EP0325134B1 (en) 1992-05-20

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EP89100268A Expired - Lifetime EP0325134B1 (en) 1988-01-22 1989-01-09 Process and apparatus for making a non-elastic, impervious and flexible pressure belt, particularly for the wet press of a paper-making machine

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US (1) US4981721A (en)
EP (1) EP0325134B1 (en)
AT (1) ATE76454T1 (en)
DE (2) DE3801850A1 (en)
WO (1) WO1993015266A1 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE3929820C1 (en) * 1989-09-07 1990-12-13 F. Oberdorfer Gmbh & Co Kg Industriegewebe-Technik, 7920 Heidenheim, De
DE4115816A1 (en) * 1991-05-15 1992-11-19 Voith Gmbh J M Press bands prodn. for paper-making - by feeding e.g. fabric strips obliquely on to roller or substrate belt and embedding them in liq. coating of e.g. polyurethane resin
AU2575992A (en) * 1991-09-12 1993-04-05 United States, as represented by Secretary Department of Health and Human Services, The Apparatus for and method of making ultra thin walled wire reinforced endotracheal tubing and product thereof
US5171389A (en) * 1991-11-08 1992-12-15 Albany International Corp. Spiral construction of grooved long nip press
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
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
US20040234716A1 (en) * 2003-05-21 2004-11-25 Madden Michael D. Method for forming endless belt
US20110061658A1 (en) * 2009-08-12 2011-03-17 Robert Koorn Oropharyngeal devices for use in ventilating patients
US8672670B2 (en) 2009-11-11 2014-03-18 Trane International Inc. System and method for controlling a furnace

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Publication number Priority date Publication date Assignee Title
GB2106557B (en) * 1981-09-24 1985-05-09 Albany Int Corp Dewatering press and belt therefor
FI75620C (en) * 1982-04-01 1988-07-11 Tampella Oy Ab LAONGZONSPRESS FOER EN PAPPERSMASKIN.
JPS5954598U (en) * 1982-10-01 1984-04-10 市川毛織株式会社 Pressure belt for wide nip press of paper machine
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
JPS61252389A (en) * 1985-04-25 1986-11-10 市川毛織株式会社 Papermaking press belt

Also Published As

Publication number Publication date
US4981721A (en) 1991-01-01
ATE76454T1 (en) 1992-06-15
EP0325134A1 (en) 1989-07-26
DE3801850A1 (en) 1989-07-27
WO1993015266A1 (en) 1993-08-05
DE58901437D1 (en) 1992-06-25

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