EP0389674A2 - Press belt for a press arrangement - Google Patents

Press belt for a press arrangement Download PDF

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Publication number
EP0389674A2
EP0389674A2 EP89120340A EP89120340A EP0389674A2 EP 0389674 A2 EP0389674 A2 EP 0389674A2 EP 89120340 A EP89120340 A EP 89120340A EP 89120340 A EP89120340 A EP 89120340A EP 0389674 A2 EP0389674 A2 EP 0389674A2
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EP
European Patent Office
Prior art keywords
rollers
plastic mixture
nozzle
band
reinforcement 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.)
Granted
Application number
EP89120340A
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German (de)
French (fr)
Other versions
EP0389674B1 (en
EP0389674A3 (en
Inventor
Karl Dr. Steiner
Josef MÜLLNER
Christian Schiel
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 & Co KG Industriegewebe-Technik GmbH
F Oberdorfer Siebtechnik GmbH
OBERDORFER FA F
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Application filed by F Oberdorfer & Co KG Industriegewebe-Technik GmbH, F Oberdorfer Siebtechnik GmbH, OBERDORFER FA F filed Critical F Oberdorfer & Co KG Industriegewebe-Technik GmbH
Publication of EP0389674A2 publication Critical patent/EP0389674A2/en
Publication of EP0389674A3 publication Critical patent/EP0389674A3/en
Application granted granted Critical
Publication of EP0389674B1 publication Critical patent/EP0389674B1/en
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Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00Press section of machines for making continuous webs of paper
    • D21F3/02Wet presses
    • D21F3/0209Wet presses with extended press nip
    • D21F3/0218Shoe presses
    • D21F3/0227Belts or sleeves therefor
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00Press section of machines for making continuous webs of paper
    • D21F3/02Wet presses
    • D21F3/0209Wet presses with extended press nip
    • D21F3/0218Shoe presses
    • D21F3/0227Belts or sleeves therefor
    • D21F3/0236Belts or sleeves therefor manufacturing methods

Definitions

  • the invention relates to a method for producing an impermeable and flexible band or hose, and to a device which is suitable for carrying out this method.
  • the aim of the invention is the production of a press belt or a tubular press jacket, which is or should be suitable for a particular press device.
  • a pressing device that is used for treating, in particular dewatering, a running material web, preferably paper web, the material web running through a press nip together with the press belt or with the press hose (and usually together with a felt belt).
  • a press belt when this endless belt runs back to the press nip over a few guide rolls after leaving the press nip.
  • a tubular press jacket is considerably shorter in the running direction; it runs outside the press nip in an essentially circular orbit either via a fixed support body with a radially movable press shoe forming the press nip or around a rotatable support body.
  • the press belt or press jacket must be completely impermeable, i.e. be liquid-tight and flexible. At the same time, it must have a high tensile strength.
  • the liquid tightness is achieved by forming a plastic layer, the high tensile strength on the other hand by a reinforcement in the plastic layer, which is formed from reinforcing threads.
  • the endless reinforcement tape which is initially still uncoated, is rotated over at least two parallel rollers.
  • a pouring nozzle an initially liquid plastic mixture in the form of a strand is poured onto the surrounding reinforcement band.
  • the pouring nozzle is arranged on a slide which can be moved parallel to the axis of the rolls.
  • the liquid plastic mixture can thus be poured onto the circumferential reinforcement tape in the manner of a screw line.
  • the "turns" lying next to each other immediately combine to form a homogeneous, liquid-tight plastic layer.
  • the screen fabric either extends along one surface of the finished press belt or press hose; or the offsets of the screen mesh protrude more or less from the plastic layer.
  • the coating of the Reinforcement tape always on one and the same side of the screen fabric, preferably in a single operation.
  • US Pat. No. 4,552,620 to coat both sides of the reinforcing tape in succession. This is intended to ensure that the reinforcement is safely within the plastic material and is therefore better protected from damage.
  • this known manufacturing method is extremely expensive.
  • the present invention has for its object to further develop the known manufacturing process in which the porous reinforcement tape is coated only from one side, such that the reinforcement tape is more encased by the plastic material in the finished product.
  • vacuum is generated in a limited area in the zone mentioned by means of a vacuum nozzle; because the level of negative pressure can be controlled with relatively simple means.
  • a sufficiently large negative pressure nozzle and a sufficiently large negative pressure it can be achieved that the still liquid or pasty plastic mixture is sucked into the reinforcing tape to such an extent that it is more or less, if desired emerges from the underside of the reinforcement tape.
  • the amount of plastic cast on per unit area may have to be increased in order to achieve a sufficient layer thickness on the upper side.
  • the device for producing a press jacket shown comprises two rollers 27 and 28 which are parallel to one another and which are rotatably mounted at their two ends in bearing blocks 15. Over these rollers 27, 28 runs an endless sieve belt 10 woven from plastic threads in tensioned state. The length of this sieve belt 10 in the direction of rotation (and thus the distance between the two rollers 27, 28) corresponds to the desired diameter of the finished press jacket, eg. B. diameter d in Fig. 3 of DE-PS 35 01 635. In addition to one of the two rolls, parallel to this, extends a machine bed 25. On this rests in slide guides 30, a carriage 26, which with the help of a Spindle 29 can be moved parallel to the rollers on the machine bed.
  • Two containers 33 for two liquid plastic components are arranged on the slide.
  • a mixing pump 34 is connected to these containers and to this a pressure line 35 which leads to a pouring nozzle 36.
  • the mouth of this pouring nozzle is directed above the roller 28 onto the reinforcement band 10.
  • the direction of rotation of the two rollers 27, 28 is such that the screen belt 10 initially runs from the point where the goat jet 11 hits the belt to the upper vertex of the other roller 27.
  • a suction nozzle 12 is arranged in the space between the two rollers 27 and 28 and the upper sieve strand. Their suction mouth is at a very short distance from the underside of the belt 10; he can also touch the bottom of the screen belt.
  • the suction nozzle 12 is arranged in the jacket of a cylindrical guide slide 13.
  • This guide slide 13 lies in the interior of a tube 14 which extends parallel to the two rollers 27 and 28 and rests at its two ends on supports 16 which in turn are fastened to the bearing blocks 15.
  • the said tube 14 has a longitudinal slot 14a through which the suction nozzle 12 extends outwards.
  • the guide slide 13 has a connecting piece 13a for a hose 18 which extends through the pipe 14 to a suction blower 19 arranged outside the pipe.
  • a rope 40 is attached to the guide slide 13. This rope also extends through the tube 14 and is guided over pulleys 41, 42 and 43 and is finally attached to one of the end faces of the carriage 26.
  • the suction nozzle 12 is always exactly below the point where the goat jet 11 strikes the sieve belt 10. It can be seen in FIG. 2 that the poured-on plastic strand initially rests more or less on the top of the screen belt or only partially penetrates the screen belt. As soon as the plastic strand then runs over the suction nozzle 12, it is sucked into the screen fabric 10 much deeper.
  • the schematic representation of FIG. 2 gives the impression that the liquid plastic is protruding from the underside of the sieve belt 10 behind the suction nozzle 12. This may be desirable in some cases; however, it is not a necessary requirement. Whether and how far this should be done (i.e.
  • valve 39 which e.g. B. is arranged on the suction side of the suction fan 19. But you can also take additional measures to control the depth of penetration. B. try to change the viscosity of the still liquid plastic mixture. Or you can the reinforcement tape 10 before pouring the plastic mixture with a flow agent, for. B. soak silicone oil, which facilitates the penetration of the plastic mixture into the reinforcement tape.
  • An important further embodiment of the invention can consist in coating or coating the jacket of at least the second roller 27 with a repellent (e.g. silicon oil). This ensures that the plastic, which may have penetrated through the screen, is smoothed by the roller without getting caught on it.
  • a repellent e.g. silicon oil

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Paper (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

In a process and arrangement for producing an impervious and flexible tubular press shell, a liquid plastics mixture is poured over an endless, porous reinforcing belt 10 which runs over two mutually parallel rollers 27, 28. Immediately downstream of the point where the pouring jet strikes the reinforcing belt, a suction nozzle 12 is located on the underside thereof. By adjusting the vacuum in this suction nozzle 12, the depth of penetration of the liquid plastics mixture into the porous reinforcing belt can be determined. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines undurchlässigen und biegsamen Bandes oder Schlauches sowie eine Vorrichtung, die zum Durchführen dieses Verfahrens geeignet ist. Ziel der Erfindung ist die Herstellung eines Preßbandes oder eines schlauchförmigen Preßmantels, das bzw. der für eine bestimmte Preßeinrichtung geeignet sein soll. Gemeint ist eine Preßeinrichtung, die zum Behandeln, insbesondere Entwässern, einer laufenden Materialbahn, vorzugsweise Papierbahn, dient, wobei die Materialbahn zusammen mit dem Preßband oder mit dem Preßschlauch (und in der Regel zusammen mit einem Filzband) durch einen Preßspalt hindurchläuft. Man spricht von einem Preßband, wenn dieses endlose Band nach dem Verlassen des Preßspaltes über einige Leitwalzen zurück zum Preßspalt läuft. Ein schlauchförmiger Preßmantel ist demgegenüber in Laufrichtung wesentlich kürzer; er läuft außerhalb des Preßspaltes auf einer im wesentlichen kreisförmigen Umlaufbahn entweder über einen feststehenden Tragkörper mit einem den Preßspalt bildenden radial beweglichen Preßschuh oder um einen drehbaren Tragkörper. Diese beiden Varianten sind beschrieben in der DE-OS 35 01 635 (= US-PS 4,625,376).The invention relates to a method for producing an impermeable and flexible band or hose, and to a device which is suitable for carrying out this method. The aim of the invention is the production of a press belt or a tubular press jacket, which is or should be suitable for a particular press device. What is meant is a pressing device that is used for treating, in particular dewatering, a running material web, preferably paper web, the material web running through a press nip together with the press belt or with the press hose (and usually together with a felt belt). One speaks of a press belt when this endless belt runs back to the press nip over a few guide rolls after leaving the press nip. In contrast, a tubular press jacket is considerably shorter in the running direction; it runs outside the press nip in an essentially circular orbit either via a fixed support body with a radially movable press shoe forming the press nip or around a rotatable support body. These two variants are described in DE-OS 35 01 635 (= US-PS 4,625,376).

Aufgrund dieses Verwendungszweckes müssen das Preßband oder der Preßmantel vollkommen undurchlässig, d.h. flüssigkeitsdicht und biegsam sein. Zugleich muß es ein hohe Zugfestigkeit aufweisen. Die Flüssigkeits-Dichtheit wird erzielt durch Bildung einer Kunststoff-Schicht, die hohe Zugfestigkeit dagegen durch eine in der Kunststoff-Schicht liegende Armierung, die aus Verstärkungsfäden gebildet ist. Diese Armierung kann ein Gewebe sein (siehe z. B. DE-OS 33 18 984 = CA-PS 1235025 oder US-PS 4,552,620).Because of this purpose, the press belt or press jacket must be completely impermeable, i.e. be liquid-tight and flexible. At the same time, it must have a high tensile strength. The liquid tightness is achieved by forming a plastic layer, the high tensile strength on the other hand by a reinforcement in the plastic layer, which is formed from reinforcing threads. This reinforcement can be a fabric (see for example DE-OS 33 18 984 = CA-PS 1235025 or US-PS 4,552,620).

Bei einem bekannten Herstellungsverfahren läßt man das end­lose Armierungsband, das zunächst noch unbeschichtet ist, über wenigstens zwei zueinander parallele Walzen umlaufen. Mit Hilfe einer Gießdüse wird nun eine zunächst flüssige Kunststoff-Mischung in Form eines Stranges auf das umlaufende Armierungsband aufgegossen. Die Gießdüse ist auf einem Schlitten angeordnet, der parallel zur Achse der Walzen verfahrbar ist. Somit kann man die flüssige Kunst­stoff-Mischung nach Art einer Schraubenlinie auf das umlaufende Armierungsband aufgießen. Jedoch verbinden sich die nebeneinander liegenden "Windungen" sofort zu einer homogenen, flüssigkeitsdichten Kunststoff-Schicht.In a known manufacturing process, the endless reinforcement tape, which is initially still uncoated, is rotated over at least two parallel rollers. With the help of a pouring nozzle, an initially liquid plastic mixture in the form of a strand is poured onto the surrounding reinforcement band. The pouring nozzle is arranged on a slide which can be moved parallel to the axis of the rolls. The liquid plastic mixture can thus be poured onto the circumferential reinforcement tape in the manner of a screw line. However, the "turns" lying next to each other immediately combine to form a homogeneous, liquid-tight plastic layer.

Bei diesem Vorgang dringt die anfangs noch flüssige Kunst­stoff-Mischung mehr oder weniger tief in das Siebgewebe ein; siehe z. B. die folgenden Druckschriften: DE-OS 32 31 039 (= GB 2 106 555) und DE-OS 32 35 468 (=GB 2 106 557).
Mit anderen Worten: das Siebgewebe erstreckt sich entweder entlang der einen Oberfläche des fertigen Preßbandes oder Preßschlauches; oder die Kröpfungen des Siebgewebes ragen mehr oder weniger weit aus der Kunststoff-Schicht heraus. In all den genannten Fällen findet das Beschichten des Armierungsbandes stets auf ein und derselben Seite des Sieb­gewebes statt, vorzugsweise in einem einzigen Arbeitsgang. Es ist aber auch bekannt (US-PS 4,552,620), nacheinander beide Seiten des Armierungsbandes zu beschichten. Man will hierdurch erreichen, daß die Armierung mit Sicherheit innerhalb des Kunststoffmaterials liegt und somit besser vor Beschädigungen geschützt ist. Dieses bekannte Herstellungs­verfahren ist jedoch außerordentlich teuer.
During this process, the initially liquid plastic mixture penetrates more or less deeply into the screen mesh; see e.g. B. the following publications: DE-OS 32 31 039 (= GB 2 106 555) and DE-OS 32 35 468 (= GB 2 106 557).
In other words: the screen fabric either extends along one surface of the finished press belt or press hose; or the offsets of the screen mesh protrude more or less from the plastic layer. In all the cases mentioned, the coating of the Reinforcement tape always on one and the same side of the screen fabric, preferably in a single operation. However, it is also known (US Pat. No. 4,552,620) to coat both sides of the reinforcing tape in succession. This is intended to ensure that the reinforcement is safely within the plastic material and is therefore better protected from damage. However, this known manufacturing method is extremely expensive.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, das bekannte Herstellungsverfahren, bei dem das poröse Armierungsband nur von einer Seite her beschichtet wird, derart weiterzuentwickeln, daß im fertigen Produkt das Armierungsband mehr als bisher vom Kunststoffmaterial umhüllt ist.The present invention has for its object to further develop the known manufacturing process in which the porous reinforcement tape is coated only from one side, such that the reinforcement tape is more encased by the plastic material in the finished product.

Diese Aufgabe wird bei dem erfindungsgemäßen Verfahren durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst. Es wurde nämlich erkannt, daß man durch das Bilden einer Druck­differenz zwischen Ober- und Unterseite des Armierungsbandes (in der Zone, wo der aufgegossene Kunststoff noch flüssig oder teigig ist) die Eindringtiefe des Kunststoffes in das Armierungsband in weit größerem Umfang steuern kann als bisher.This object is achieved in the method according to the invention by the characterizing features of claim 1. It was namely recognized that by forming a pressure difference between the top and bottom of the reinforcement band (in the zone where the poured plastic is still liquid or pasty), the depth of penetration of the plastic into the reinforcement band can be controlled to a much greater extent than before.

Dies gelingt am besten, wenn man - gemäß einem weiteren Gedanken der Erfindung - in der genannten Zone mittels einer Unterdruck-Düse in einem begrenzten Bereich Unterdruck erzeugt; denn die Höhe des Unterdruckes ist mit verhältnis­mäßig einfachen Mitteln steuerbar. Bei Anwendung einer genügend großen Unterdruck-Düse und genügend großen Unter­druckes kann man erreichen, daß die noch flüssige oder teigige Kunststoff-Mischung so weit in das Armierungsband eingesaugt wird, daß es - wenn gewünscht - mehr oder weniger aus der Unterseite des Armierungsbandes heraustritt. Es versteht sich, daß man die je Flächeneinheit aufgegossene Kunststoff-Menge eventuell erhöhen muß, um auf der Oberseite eine genügende Schichtdicke zu erzielen.This is best achieved if, according to a further idea of the invention, vacuum is generated in a limited area in the zone mentioned by means of a vacuum nozzle; because the level of negative pressure can be controlled with relatively simple means. When using a sufficiently large negative pressure nozzle and a sufficiently large negative pressure, it can be achieved that the still liquid or pasty plastic mixture is sucked into the reinforcing tape to such an extent that it is more or less, if desired emerges from the underside of the reinforcement tape. It goes without saying that the amount of plastic cast on per unit area may have to be increased in order to achieve a sufficient layer thickness on the upper side.

Weitere Ausgestaltungen des erfindungsgemäßen Verfahrens und Einzelheiten der zur Durchführung des Verfahrens geeigneten Vorrichtung sind in den weiteren Patentansprüchen angegeben. Sie sind außerdem anhand eines Ausführungsbeispiels, das in der Zeichnung dargestellt ist, erläutert.

  • Die Fig. 1 zeigt eine Draufsicht auf eine Vorrichtung zum Herstellen eines Preßmantels.
  • Die Fig. 2 zeigt einen Querschnitt nach Linie II-II der Fig. 1.
  • Die Fig. 3 zeigt ein Detail im Längsschnitt nach Linie III der Fig. 2.
Further refinements of the method according to the invention and details of the device suitable for carrying out the method are specified in the further patent claims. They are also explained using an exemplary embodiment which is illustrated in the drawing.
  • Fig. 1 shows a plan view of a device for producing a press jacket.
  • FIG. 2 shows a cross section along line II-II of FIG. 1.
  • FIG. 3 shows a detail in longitudinal section along line III of FIG. 2.

Die dargestellte Vorrichtung zur Herstellung eines Preßmantels umfaßt zwei zueinander parallele Walzen 27 und 28, die an ihren beiden Enden in Lagerböcken 15 drehbar gelagert sind. Über diese Walzen 27, 28 läuft in gespanntem Zustand ein aus Kunststoffäden gewebtes endloses Siebband 10. Die Länge dieses Siebbandes 10 im Umlaufrichtung (und somit der Abstand zwischen den zwei Walzen 27, 28) entspricht dem gewünschten Durchmesser des fertigen Preßmantels, z. B. Durchmesser d in Fig. 3 der DE-PS 35 01 635. Neben einer der beiden Walzen erstreckt sich, parallel zu diesen, ein Maschinenbett 25. Auf diesem ruht in Gleitführungen 30 ein Schlitten 26, der mit Hilfe einer Spindel 29 auf dem Maschinenbett parallel zu den Walzen ver­fahren werden kann. Auf dem Schlitten sind zwei Behälter 33 für zwei flüssige Kunststoff-Komponenten angeordnet. An diese Behälter ist eine Mischpumpe 34 angeschlossen und an diese eine Druckleitung 35, die zu einer Gießdüse 36 führt. Die Mündung dieser Gießdüse ist oberhalb der einen Walze 28 auf das Armierungsband 10 gerichtet. Die Drehrichtung der beiden Walzen 27, 28 ist derart, daß das Siebband 10 von der Stelle, wo der Geißstrahl 11 auf das Band auftrifft, zunächst zum oberen Scheitelpunkt der anderen Walze 27 läuft.The device for producing a press jacket shown comprises two rollers 27 and 28 which are parallel to one another and which are rotatably mounted at their two ends in bearing blocks 15. Over these rollers 27, 28 runs an endless sieve belt 10 woven from plastic threads in tensioned state. The length of this sieve belt 10 in the direction of rotation (and thus the distance between the two rollers 27, 28) corresponds to the desired diameter of the finished press jacket, eg. B. diameter d in Fig. 3 of DE-PS 35 01 635. In addition to one of the two rolls, parallel to this, extends a machine bed 25. On this rests in slide guides 30, a carriage 26, which with the help of a Spindle 29 can be moved parallel to the rollers on the machine bed. Two containers 33 for two liquid plastic components are arranged on the slide. A mixing pump 34 is connected to these containers and to this a pressure line 35 which leads to a pouring nozzle 36. The mouth of this pouring nozzle is directed above the roller 28 onto the reinforcement band 10. The direction of rotation of the two rollers 27, 28 is such that the screen belt 10 initially runs from the point where the goat jet 11 hits the belt to the upper vertex of the other roller 27.

In dem Zwischenraum, der sich zwischen den zwei Walzen 27 und 28 und dem oberen Sieb-Trum befindet, ist eine Saugdüse 12 angeordnet. Deren Saugmund liegt in sehr geringem Abstand von der Unterseite des Siebbandes 10; er kann die Siebband-­Unterseite auch berühren. Die Saugdüse 12 ist im Mantel eines zylinderförmigen Führungsschiebers 13 angeordnet. Dieser Führungsschieber 13 liegt im Inneren eines Rohres 14, das sich parallel zu den beiden Walzen 27 und 28 erstreckt und an seinen beiden Enden auf Trägern 16 ruht, welche ihrerseits auf den lagerböcken 15 befestigt sind. Das genannte Rohr 14 hat einen Längsschlitz 14a, durch das sich die Saugdüse 12 nach außen erstreckt. Der Führungsschieber 13 hat einen Anschlußstutzen 13a für einen Schlauch 18, der sich durch das Rohr 14 hindurch bis zu einem außerhalb des Rohres angeordneten Sauggebläse 19 erstreckt.A suction nozzle 12 is arranged in the space between the two rollers 27 and 28 and the upper sieve strand. Their suction mouth is at a very short distance from the underside of the belt 10; he can also touch the bottom of the screen belt. The suction nozzle 12 is arranged in the jacket of a cylindrical guide slide 13. This guide slide 13 lies in the interior of a tube 14 which extends parallel to the two rollers 27 and 28 and rests at its two ends on supports 16 which in turn are fastened to the bearing blocks 15. The said tube 14 has a longitudinal slot 14a through which the suction nozzle 12 extends outwards. The guide slide 13 has a connecting piece 13a for a hose 18 which extends through the pipe 14 to a suction blower 19 arranged outside the pipe.

Damit sich die Saugdüse 12 synchron mit der Gießdüse 36 parallel zur Walzenachse bewegt, ist am Führungsschieber 13 ein Seil 40 befestigt. Dieses Seil erstreckt sich ebenfalls durch das Rohr 14 und ist über Seilrollen 41, 42 und 43 geführt und ist schließlich an einer der Stirnseiten des Schlittens 26 befestigt.So that the suction nozzle 12 moves synchronously with the pouring nozzle 36 parallel to the roller axis, a rope 40 is attached to the guide slide 13. This rope also extends through the tube 14 and is guided over pulleys 41, 42 and 43 and is finally attached to one of the end faces of the carriage 26.

Wesentlich ist, daß die Saugdüse 12 sich stets genau unterhalb derjenigen Stelle befindet, wo gerade der Geißstrahl 11 auf das Siebband 10 auftrifft. Man sieht in Fig. 2, daß der aufgegossene Kunststoffstrang zunächst mehr oder weniger auf der Oberseite des Siebbandes aufliegt oder nur zum Teil in das Siebband eindringt. Sobald der Kunststoffstrang danach über die Saugdüse 12 läuft, wird er wesentlich tiefer in das Siebgewebe 10 eingesaugt. Die schematische Darstellung der Fig. 2 erweckt den Eindruck, als würde der flüssigen Kunststoff hinter der Saugdüse 12 aus der Unterseite des Siebbandes 10 hervordringen. Dies kann in manchen Fällen erwünscht sein; es ist jedoch kein notwendiges Erfordernis. Ob und wie weit dies geschehen soll (d.h. wie weit die Eindringtiefe des Kunststoffes an der Saugdüse 12 vergrößert werden soll), kann gesteuert werden mittels eines Ventils 39, das z. B. an der Saugseite des Sauggebläses 19 angeordnet ist. Man kann aber auch zusätzliche Maßnahmen zur Steuerung der Eindringtiefe ergreifen: So kann man z. B. versuchen, die Viskosität der noch flüssigen Kunststoff-Mischung zu verändern. Oder man kann das Armierungsband 10 vor dem Aufgießen der Kunststoff-­Mischung mit einem Fließmittel,z. B. Silikonöl tränken, welches das Eindringen der Kunststoff-Mischung in das Armierungsband erleichtert.It is essential that the suction nozzle 12 is always exactly below the point where the goat jet 11 strikes the sieve belt 10. It can be seen in FIG. 2 that the poured-on plastic strand initially rests more or less on the top of the screen belt or only partially penetrates the screen belt. As soon as the plastic strand then runs over the suction nozzle 12, it is sucked into the screen fabric 10 much deeper. The schematic representation of FIG. 2 gives the impression that the liquid plastic is protruding from the underside of the sieve belt 10 behind the suction nozzle 12. This may be desirable in some cases; however, it is not a necessary requirement. Whether and how far this should be done (i.e. how far the penetration depth of the plastic at the suction nozzle 12 should be increased) can be controlled by means of a valve 39, which e.g. B. is arranged on the suction side of the suction fan 19. But you can also take additional measures to control the depth of penetration. B. try to change the viscosity of the still liquid plastic mixture. Or you can the reinforcement tape 10 before pouring the plastic mixture with a flow agent, for. B. soak silicone oil, which facilitates the penetration of the plastic mixture into the reinforcement tape.

Eine wichtige weitere Ausgestaltung der Erfindung kann darin bestehen, daß man den Mantel zumindest der zweiten Walze 27 mit einem Abstoßmittel beschichtet oder bestreicht (z.B. Silikanöl). Hierdurch wird erreicht, daß der Kunststoff der evtl. durch das Sieb hindurchgedrungen ist, durch die Walze geglättet wird, ohne daran hängenzubleiben.An important further embodiment of the invention can consist in coating or coating the jacket of at least the second roller 27 with a repellent (e.g. silicon oil). This ensures that the plastic, which may have penetrated through the screen, is smoothed by the roller without getting caught on it.

Falls gewünscht, kann man in einer bestimmten Zone der Breite des Preßmantels (oder in mehreren Zonen, z. B. im Bereich der beiden Enden des Preßschuhes 26 der Fig. 1 der DE-OS 35 01 635) dafür sorgen, daß die noch flüssige Kunst­stoff-Mischung tiefer in das Siebband 10 eindringt oder weiter aus der Unterseite des Bandes austritt als außerhalb dieser Zonen. Man kann auf diese Weise erreichen, daß der Preßmantel in den besonders gefährdeten Zonen eine zusätzliche Verstärkung erfährt. Falls gewünscht, kann man außerhalb der vorgenannten Zonen die Eindringtiefe des Kunststoffes in das Siebband so einstellen, daß die äußeren Kröpfungen des Siebbandes, wie an sich bekannt, eine feine geringfügige Welligkeit der Oberfläche erzeugen, die für den Antrieb des Preßmantels erwünscht sein kann.If desired, it can be ensured in a certain zone of the width of the press jacket (or in several zones, for example in the area of the two ends of the press shoe 26 in FIG. 1 of DE-OS 35 01 635) that the still liquid Plastic mixture penetrates deeper into the sieve belt 10 or emerges further from the underside of the belt than outside of these zones. In this way it can be achieved that the Press jacket in the particularly vulnerable zones undergoes additional reinforcement. If desired, you can adjust the penetration depth of the plastic into the sieve belt outside the aforementioned zones so that the outer crankings of the sieve belt, as is known per se, produce a fine slight ripple in the surface, which may be desirable for driving the press jacket.

Claims (15)

1. Verfahren zur Herstellung eines undurchlässigen und biegsamen Bandes oder Schlauches, bei dem man auf ein endloses, poröses Armierungsband (10) (z. B. auf ein Siebgewebe), das über wenigstens zwei zueinander parallele Walzen (27, 28) umläuft, eine zunächst flüssige Kunststoff-Mischung in Form eines Stranges (11) nach Art einer Schraubenlinie aufbringt,
wobei der Kunststoff-Strang in das Armierungsband eindringt und beim Aushärten eine undurchlässige Kunststoff-Schicht bildet,
dadurch gekennzeichnet, daß kurz hinter der Stelle, wo der Kunststoff-­Strang auf die Oberseite des Armierungsbandes aufgegossen wird, durch Bilden einer Druckdifferenz zwischen Ober- und Unterseite des Armierungsbandes die Eindringtiefe der noch flüssigen Kunststoff-­Mischung in das Armierungsband erhöht wird.
1. A method for producing an impermeable and flexible band or hose, in which one on an endless, porous reinforcement band (10) (z. B. on a screen fabric), which rotates over at least two mutually parallel rollers (27, 28) first of all applies a liquid plastic mixture in the form of a strand (11) in the manner of a helix,
the plastic strand penetrates into the reinforcement band and forms an impermeable plastic layer when hardened,
characterized in that just behind the point where the plastic strand is poured onto the top of the reinforcement band, the depth of penetration of the still liquid plastic mixture into the reinforcement band is increased by forming a pressure difference between the top and bottom of the reinforcement band.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man in dem Bereich der Unterseite des Armierungsbandes, wo der genannte Kunststoff-Strang aufgegossen wird, mittels einer Unterdruck-Düse (12) die
noch flüssige Kunststoff-Mischung in das Armierungsband (10) einsaugt.
2. The method according to claim 1, characterized in that in the area of the underside of the reinforcing tape, where said plastic strand is poured on, by means of a vacuum nozzle (12)
sucks still liquid plastic mixture into the reinforcement band (10).
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß man den Unterdruck auf einen derartigen Wert einstellt, daß die noch flüssige Kunststoff-Mischung das Armierungsband (10) vollkommen durchdringt.3. The method according to claim 2, characterized in that the vacuum is set to such a value that the still liquid plastic mixture completely penetrates the reinforcing tape (10). 4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekenn­zeichnet, daß das Armierungsband (10) vor dem Aufgießen der Kunststoff-­Mischung mit einem Fließmittel getränkt wird, welches das Ein­dringen der Kunststoff-Mischung in das Armierungsband erleichtert.4. The method according to any one of claims 1 to 3, characterized in that the reinforcing tape (10) is soaked with a plasticizer before pouring the plastic mixture, which facilitates the penetration of the plastic mixture into the reinforcing tape. 5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß als Fließmittel Silikonöl verwendet wird.5. The method according to claim 4, characterized in that silicone oil is used as flow agent. 6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekenn­zeichnet, daß in wenigstens einer Zone der Breite des biegsamen Bandes beim Aufgießen der Kunststoff-Mischung eine höhere Druckdifferenz eingestellt wird als außerhalb dieser, so daß in dieser Zone die Kunststoff-Mischung tiefer in das Armierungsband (10) ein­dringt.6. The method according to any one of claims 1 to 5, characterized in that in at least one zone of the width of the flexible band when pouring the plastic mixture, a higher pressure difference is set than outside this, so that in this zone the plastic mixture deeper in the reinforcement tape (10) penetrates. 7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß in der genannten Zone, wo eine höhere Druckdifferenz eingestellt wird, je Flächeneinheit eine größere Menge an Kunststoff-Mischung aufgegossen wird als außerhalb dieser Zone.7. The method according to claim 6, characterized in that in the said zone, where a higher pressure difference is set, a larger amount of plastic mixture is poured per unit area than outside this zone. 8. Vorrichtung zum Herstellung eines undurchlässigen und biegsamen Bandes oder Schlauches mit den folgenden Merkmalen: a) wenigstens zwei zueinander parallele Walzen (27,28) sind derart angeordnet, daß ein endloses, poröses Armierungsband (10) über die Walzen umlaufen kann; b) oberhalb einer der Walzen ist die Mündung einer Gießdüse (36) für eine flüssige Kunststoff-Mischung auf das Armierungsband (10) ge­richtet; c) die Gießdüse (36) ist auf einem Schlitten (26) angeordnet, der parallel zu den Achsen der Walzen (27, 28) verfahrbar ist; d) dadurch gekennzeichnet, daß in Bandlaufrichtung hinter der Gieß­düse (36) eine Einrichtung (12) zur Erzeugung einer Druckdifferenz zwischen Ober- und Unterseite des Armierungsbandes (10) vorgesehen ist, die gemeinsam mit dem genannten Schlitten (26) parallel zur Walzenachse verfahrbar ist. 8. Device for producing an impermeable and flexible band or hose with the following features: a) at least two mutually parallel rollers (27, 28) are arranged such that an endless, porous reinforcement band (10) can run over the rollers; b) above one of the rollers, the mouth of a pouring nozzle (36) for a liquid plastic mixture is directed onto the reinforcement band (10); c) the pouring nozzle (36) is arranged on a carriage (26) which can be moved parallel to the axes of the rollers (27, 28); d) characterized in that a device (12) for generating a pressure difference between the top and bottom of the reinforcing band (10) is provided in the belt running direction behind the casting nozzle (36), which can be moved parallel to the roller axis together with the said carriage (26) . 9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß die genannte Einrichtung zur Erzeugung einer Druckdifferenz als eine innerhalb der endlosen Schlaufe des Armierungsbandes (10) angeordnete Saugdüse (12) ausgebildet ist.9. The device according to claim 8, characterized in that said means for generating a pressure difference is designed as a suction nozzle (12) arranged within the endless loop of the reinforcement band (10). 10. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß die Saugdüse (12) mittels eines Seilzuges (40) mit dem Schlitten (26), der die Gießdüse (36) trägt, verbunden ist.10. The device according to claim 8, characterized in that the suction nozzle (12) by means of a cable (40) with the carriage (26) which carries the pouring nozzle (36) is connected. 11. Vorrichtung nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß die Saugdüse (12) auf einem Führungswagen angeordnet ist, der sich auf zwei der genannten Walzen abstützt.11. The device according to claim 9 or 10, characterized in that the suction nozzle (12) is arranged on a guide carriage which is supported on two of the rollers mentioned. 12. Vorrichtung nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß die Saugdüse (12) in einem Führungsschieber (13) angeordnet ist, der in einem geschlitzten Rohr (14) gleitet, welches sich parallel zwischen zwei der genannten Walzen (27, 28) erstreckt.12. The apparatus according to claim 9 or 10, characterized in that the suction nozzle (12) is arranged in a guide slide (13) which slides in a slotted tube (14) which is parallel between two of said rollers (27, 28) extends. 13. Vorrichtung nach Anspruch 12, dadurch gekennzeichnet, daß das geschlitzte Rohr (14), welches an seinen beiden Enden auf einer festen Unterlage (16) abgestützt ist, zumindest im mittleren Bereich der Länge der zwei Walzen (27, 28) mittels Laufrollen (17) auf diesen Walzen zusätzlich abgestützt ist.13. The apparatus according to claim 12, characterized in that the slotted tube (14), which is supported at both ends on a solid base (16), at least in the central region of the length of the two rollers (27, 28) by means of rollers ( 17) is additionally supported on these rollers. 14. Vorrichtung nach Anspruch 13, dadurch gekennzeichnet, daß der Führungsschieber (13) mittels eines Schlauches (18), der sich durch das geschlitzte Rohr (14) hindurch erstreckt, an ein Sauggebläse (19) angeschlossen ist.14. The apparatus according to claim 13, characterized in that the guide slide (13) is connected to a suction fan (19) by means of a hose (18) which extends through the slotted tube (14). 15. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß die genannte Einrichtung zur Erzeugung einer Druckdifferenz als eine über dem Armierungsband angeordnete Blasdüse ausgebildet ist.15. The apparatus according to claim 8, characterized in that said means for generating a pressure difference is designed as a blowing nozzle arranged above the reinforcement band.
EP89120340A 1989-03-25 1989-11-03 Press belt for a press arrangement Expired - Lifetime EP0389674B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3909935 1989-03-25
DE3909935A DE3909935C2 (en) 1989-03-25 1989-03-25 Method and device for producing an impermeable and flexible band or hose

Publications (3)

Publication Number Publication Date
EP0389674A2 true EP0389674A2 (en) 1990-10-03
EP0389674A3 EP0389674A3 (en) 1991-02-27
EP0389674B1 EP0389674B1 (en) 1994-05-18

Family

ID=6377259

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89120340A Expired - Lifetime EP0389674B1 (en) 1989-03-25 1989-11-03 Press belt for a press arrangement

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EP (1) EP0389674B1 (en)
AT (1) ATE105885T1 (en)
DE (1) DE3909935C2 (en)
ES (1) ES2053913T3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4041403A1 (en) * 1990-12-21 1992-06-25 Wangner Gmbh Co Kg Hermann PAPER MACHINE COVER WITH EDGE REINFORCEMENT AND METHOD FOR APPLYING THE EDGE REINFORCEMENT
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
FI103209B2 (en) 1998-01-02 2005-04-04 Valmet Corp Method for surface coating of press or conveyor belts and corresponding surface-coated belt

Citations (2)

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Publication number Priority date Publication date Assignee Title
EP0194602A1 (en) * 1985-03-13 1986-09-17 Albany International Corp. A method for producing an endless belt with a smooth inner surface for use in a papermaking extended nip press
WO1988008897A1 (en) * 1987-05-07 1988-11-17 J.M. Voith Gmbh Reinforced pressing shell for a pressing device for treating strip materials, e.g. paper webs, and process and device for its manufacture

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Publication number Priority date Publication date Assignee Title
GB2106555B (en) * 1981-09-15 1985-10-02 Albany Int Corp Improvements relating to extended nip dewatering presses and to the manufacture of belts for use in such presses
FR2513281B1 (en) * 1981-09-24 1985-07-26 Albany Int Corp PRESS FOR EXTRACTING WATER FROM A PAPER PULP AND METHOD FOR PRODUCING A BELT FOR SUCH A PRESS
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
DE3501635A1 (en) * 1985-01-19 1986-07-24 J.M. Voith Gmbh, 7920 Heidenheim PRESS ROLLER

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0194602A1 (en) * 1985-03-13 1986-09-17 Albany International Corp. A method for producing an endless belt with a smooth inner surface for use in a papermaking extended nip press
WO1988008897A1 (en) * 1987-05-07 1988-11-17 J.M. Voith Gmbh Reinforced pressing shell for a pressing device for treating strip materials, e.g. paper webs, and process and device for its manufacture

Also Published As

Publication number Publication date
EP0389674B1 (en) 1994-05-18
EP0389674A3 (en) 1991-02-27
DE3909935A1 (en) 1990-10-04
ATE105885T1 (en) 1994-06-15
DE3909935C2 (en) 1995-04-27
ES2053913T3 (en) 1994-08-01

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