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EP0416219A1 - Foil blade for the forming section of a papermaking machine - Google Patents

Foil blade for the forming section of a papermaking machine Download PDF

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Publication number
EP0416219A1
EP0416219A1 EP90110333A EP90110333A EP0416219A1 EP 0416219 A1 EP0416219 A1 EP 0416219A1 EP 90110333 A EP90110333 A EP 90110333A EP 90110333 A EP90110333 A EP 90110333A EP 0416219 A1 EP0416219 A1 EP 0416219A1
Authority
EP
European Patent Office
Prior art keywords
pressure
guide surface
bar
screens
pressing
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
EP90110333A
Other languages
German (de)
French (fr)
Other versions
EP0416219B1 (en
Inventor
Alfred Dr. Bubik
Herbert Holik
Otto Hildebrand
Karl Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Sulzer Papiermaschinen GmbH
Original Assignee
Sulzer Escher Wyss GmbH
Escher Wyss GmbH
Voith Sulzer Papiermaschinen GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sulzer Escher Wyss GmbH, Escher Wyss GmbH, Voith Sulzer Papiermaschinen GmbH filed Critical Sulzer Escher Wyss GmbH
Publication of EP0416219A1 publication Critical patent/EP0416219A1/en
Application granted granted Critical
Publication of EP0416219B1 publication Critical patent/EP0416219B1/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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • D21F1/483—Drainage foils and bars
    • D21F1/486—Drainage foils and bars adjustable
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • the invention relates to a bar for the sheet formation zone of a paper machine of the type specified in the preamble of claim 1.
  • the suspension introduced between the screens is subjected to pressures which change in the machine direction, the aqueous part of the suspension being drawn off by the screens and a sheet being formed between the screens.
  • the pressure changes are necessary to avoid flocculation of fibers and cheap to achieve a good sheet formation.
  • pressure units are usually provided below and above the screens, which are equipped with strips arranged one behind the other and transversely to the machine direction.
  • Such constructions are e.g. known from DE-OS 31 53 305, DE-OS 35 03 242, EP-A-0 160 615, DE 38 30 683 A1 and from DE patent application P 38 15 316.5.
  • the invention was based on the object of proposing a strip of the type specified at the outset, in which the pressure surges at the inlet in the region of the strip are kept low with a sensible design of the contour of the guide surface, which effect is also obtained during or after the adjustment of the strip during operation remains.
  • This should make it possible to use the bar as early as possible at low dry contents of the material to be treated, without the material web being compressed.
  • One goal is to achieve a good formation with the best possible quality and to see through the formed paper sheet by using the bar.
  • the adjustability should be ensured with relatively simple and reliable means of operation.
  • the intended distances between the respective screen and the guide surface are essentially retained in all points, so that the desired pressure changes during and after the adjustment of the pressure part such as desired.
  • the material web between the screens can be gently pressure treated without being damaged or impaired.
  • the strips according to the invention can be used in the sheet formation zone even at low dry contents of the material albalin. This is a good formation for a sheet of paper with a frosted glass-like view reachable. An adjustment of the bar is guaranteed with proven means.
  • strips 1 are provided. Each bar 1 is arranged transversely to the machine direction, which is indicated by an arrow. It is suitable for guiding screens 2 and 3, between which a material web 4 is formed by variable pressure treatment, starting from the strips.
  • the strips 1 can be adjusted relative to the sieves 2 and 3 and are supported on part 12 of a pressing unit that can be positioned relative to the sieves or to the material web 4 in a deflection-resistant manner.
  • the guide surface 5 of the bar 1 facing the screens 2 or 3 has a useful contour in cross-section, by means of which shape steep pressure gradients on the inlet and outlet sides of the guide surface are to be avoided, a pressure increase being to be achieved on the inlet side.
  • support elements 14 are provided on the screens 2 and 3 in the example shown, which cooperate with the strips 1 during the pressure treatment of the material web 4.
  • the strip 1 has a support part 6 which is fastened to the part 12 and a pressure part 7 with the guide surface 5 with a meaningful contour.
  • the position of the pressure part is in the direction by means of a pressure device 8, which is supported on the support part 6 adjustable relative to sieves 2 and 3.
  • the pressure device has a pressure element 9 which can be acted upon with a pressure medium - gas or liquid - which is supported on the support part 6 and acts on the pressure part 7.
  • the pressure element 9 is a hose that can be acted upon with a pressure medium and thus deformable. This is embedded in the support part 6, so that its deformation caused by the action - in the case of a smaller or larger curvature - acts in cross-section on the pressure part to position it relative to the support part 6.
  • connection 10 is provided, which when the pressure part 7 is moved relative to the support part 6 with the aid of the pressing device 8, a simultaneous inclination of the pressure part 7 or its guide surface 5 corresponding to this movement relative to the sieves 2 or 3 and to the support part 6, the pivot axis running in the direction of the bar.
  • This connection can have a fulcrum 15, in which the pressure part can be rotated, as shown in FIG. 2.
  • a leaf spring at this point could also serve the same purpose.
  • the pressure part 7 made of a plastic, e.g. made of polyethylene, as shown in FIG. 1, the connection 10 may be made of the same material and part of the pressure part 7 and may have a kink, which then acts as the pivot point 15 mentioned above.
  • the pressure part 7 is made of a relatively soft and flexible plastic (it is recommended to provide at least a section of the guide surface where there is a risk of abrasion to the screen due to its contour) with an integrated abrasion-resistant layer, for example ceramic insert.
  • an integrated abrasion-resistant layer for example ceramic insert.
  • FIG. 2 An example of which is shown in Fig. 2, where the ceramic insert is designated 11.
  • the strips 1 in a pressing unit 12 for a twin wire former of a paper machine. Since they are arranged one behind the other in the machine running direction and thus combined and fastened on a frame 13, as shown in FIG. 5.
  • the frame 13 is for positioning the bar arrangement can be raised and tilted relative to sieves 2 and 3.
  • Pressure bars 16 and guide 17 on the frame 13 serve this purpose.
  • the strips can be inserted from the side of the frame 13. T-guides 18 are used for this purpose, which can be seen particularly clearly in FIGS. 1 to 4.
  • the pressure parts 7 can be inserted separately from the support parts 6 to the support parts 6 from the side of the part 13. This allows pressure parts with different guide surfaces to be used in accordance with different technological requirements and easily replaced.
  • the pressure parts 7 can thus be pressed against the screens 2 or 3.
  • the pressure generated between the sieves is absorbed by the support elements 14 on the opposite side.
  • By adjusting the position of the pressure part 7 can be adapted to the different suspension heights between the sieves.
  • the sieve in question is increasingly pressed in the direction of the support element 14. This causes the suspension between the screens to experience increased pressure.
  • the squeezed aqueous part of the suspension adheres to the sieve as a film and is transported at about the sieving speed into the inlet wedge between the guide surface and the sieve and also partially deflected back there. This creates a pressure increase in this area, which causes a gentle pretreatment of the suspension between the sieves.
  • Part of the film is carried as a sliding film between the screen and the guide surface and is pulled off at the end of the guide surface.
  • the pressure in the pressure element 9 can simply be increased.
  • the contour of the guide surface that can be designed meaningfully can have straight, concave or convex sections.
  • the acute angle between the sieve and the contour section in question can be between 10 minutes and 20 degrees, the contour here also being stepped.
  • the actual contact surface the contour that is covered by the screen can be straight or curved - concave or convex.
  • the contour can also have one or more turning points. Only a few examples are shown in the drawing of all these possibilities for the sensible design of the contour of the guide surface 5. See the guide surfaces 5 in FIGS. 1 to 4.
  • the strips according to the invention can be used in a pressure unit acting from below as from above relative to the sieves. 3 and 4 show the latter possibility using examples.
  • the opposite side to the strips 1 can have any known contour or contours. It can be a flat, convex or concave fixed shoe or an open or closed forming roller or a suction roller.
  • the strips 1 can be used in all known forms. E.g. in the apparatuses known from DE - 38 30 683 A1.
  • the great advantage is that different treatment zones can be easily set along the sheet formation zone. E.g. it is often advantageous to set a softer forming zone at the beginning and a harder forming zone at the end.
  • the pressure gradient at the inlet to the strip and the pressure between the sieves can be set as desired for every dewatering requirement in the forming area, so that an optimal, uniform formation can be achieved.
  • the strips 1 can also be used in the front area of the sheet formation in the twin wire, where the material has a low dry content without the web being pressed. Sheet quality can thus be achieved beyond the previous level, e.g. the frosted glass-like view without loss of strength of the web.

Landscapes

  • Paper (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Abstract

The ledge is arranged transverse to the machine direction in a substantially flexure resistant manner and is adjustable for guiding the wires between which a web of material is formed. The ledge contains a guide surface which faces the wires and has a special contour. For improved control of the pressure changes occurring in the region of the ledge, the ledge contains a supporting member and a pressing member which contains the guide surface. A pressing device is supported at the supporting member and the pressing member can be adjusted in a direction relative to the wires as well as relative to the supporting member by using the pressing device for simultaneously elevating the pressing member and inclining the pressing member with respect to the machine direction. Advantageously the pressing device constitutes a hose which is subjected to a pressurizing medium and thereby deformable. The hose is at least partially imbedded into the supporting member such that its deformation causes movement of the pressing member. For simultaneously inclining the pressing member during such movement, a connecting member is provided between the pressing member and the supporting member. The ledge permits the adjustment of optimum pressures along a sheet forming zone whereby the sheet formation is improved.

Description

Die Erfindung betrifft eine Leiste für die Blattbildungszone einer Papiermaschine der im Oberbegriff des Patentanspruchs 1 angegebenen Art.The invention relates to a bar for the sheet formation zone of a paper machine of the type specified in the preamble of claim 1.

Bei einer Herstellung von Papier oder Karton wird die zwischen den Sieben eingetragene Suspension sich in Maschinenlaufrichtung ändernden Drücken unterzogen, wobei der wässrige Teil der Suspension durch die Siebe abgezogen wird, und sich zwischen den Sieben ein Blatt bildet. Die Druckänderungen sind notwendig, um Ausflockungen von Fasern zu vermeiden und günstig, um eine gute Blattformation zu erreichen.In the production of paper or cardboard, the suspension introduced between the screens is subjected to pressures which change in the machine direction, the aqueous part of the suspension being drawn off by the screens and a sheet being formed between the screens. The pressure changes are necessary to avoid flocculation of fibers and cheap to achieve a good sheet formation.

Dazu werden meistens unterhalb und oberhalb der Siebe Anpresseinheiten vorgesehen, die mit in Maschinenlaufrichtung hintereinander und quer zu dieser angeordneten Leisten bestückt sind. Solche Konstruktionen sind z.B. aus DE-OS 31 53 305, DE-OS 35 03 242, EP-A-0 160 615, DE 38 30 683 A 1 und aus der DE-Patentanmeldung P 38 15 316.5 bekannt.For this purpose, pressure units are usually provided below and above the screens, which are equipped with strips arranged one behind the other and transversely to the machine direction. Such constructions are e.g. known from DE-OS 31 53 305, DE-OS 35 03 242, EP-A-0 160 615, DE 38 30 683 A1 and from DE patent application P 38 15 316.5.

Bei den bisherigen Ausführungen setzt jeweils an den Leisten ein Druckstoß plötzlich und stark ein, so daß im Extremfall das bereits zwischen den Sieben gebildete Vlies zerstört oder die gebildete Bahn verdrückt werden kann. Insbesondere können große Unregelmäßigkeiten im Bahngewicht oder Faserflocken durch den zu steilen Druckgradienten beim Druckstoß im Formierbereich zu lokalen Verdrückungen führen. Die Bahnformation wird beeinträchtigt, und auch die Festigkeitswerte der Bahn werden entscheidend verschlechtert.In the previous versions, a pressure surge occurs suddenly and strongly on the strips, so that in extreme cases the fleece already formed between the sieves can be destroyed or the web formed can be squeezed. In particular, large irregularities in the web weight or fiber flakes can lead to local displacements due to the too steep pressure gradient during the pressure surge in the forming area. The web formation is impaired and the strength values of the web are also significantly deteriorated.

Ziel der bisherigen Entwicklung ist es, solche Probleme bei Anwendung der Leisten zu reduzieren. Es wurden Leisten mit sinnvollen Konturen ihrer den Sieben zugewandten Führungsfläche vorgeschlagen, wodurch ein niedriger Druckstoß am Einlauf in den Bereich der Leiste erzielt werden soll. Ein diesbezüglich wünschenswerter Erfolg ist jedoch allein durch diese Maßnahme nicht erreichbar. Auch die bisher vorgeschlagenen Maßnahmen zur Verstellung der Leisten relativ zu den Sieben vereiteln die durch die sinnvolle Formgebung der Führungsfläche zu erwartenden Effekte, da durch die Verstellung die Abstände zwischen den Sieben und der Führungsfläche entlang ihrer Kontur gegebenenfalls wesentlich verändert werden.The aim of the previous development is to reduce such problems when using the strips. There were strips with meaningful contours of their facing the seven Guide surface proposed, whereby a low pressure surge at the inlet in the area of the bar should be achieved. However, this measure alone cannot achieve a desired success. The previously proposed measures for adjusting the strips relative to the sieves also thwart the effects to be expected from the sensible shape of the guide surface, since the distances between the sieves and the guide surface along their contours may be significantly changed by the adjustment.

Der Erfindung lag die Aufgabe zugrunde, eine Leiste der eingangs angegebenen Art vorzuschlagen, bei der die Druckstösse am Einlauf im Bereich der Leiste bei sinnvoller Gestaltung der Kontur der Führungsfläche niedrig gehalten werden, welcher Effekt auch bei bzw. nach der Verstellung der Leiste beim Betrieb erhalten bleibt. Dadurch soll es möglich sein, die Leiste möglichst schon bei niedrigen Trockengehalten des zu behandelnden Materials einzusetzen, ohne daß ein Verdrücken der Materialbahn vorkommt. Ein Ziel ist, durch Einsatz der Leiste eine gute Formation zu erreichen von möglichst guter Qualität und Durchsicht des formierten Papierblattes. Die Verstellbarkeit soll mit relativ einfachen und im Betrieb verläßlichen Mitteln gewährleistet werden.The invention was based on the object of proposing a strip of the type specified at the outset, in which the pressure surges at the inlet in the region of the strip are kept low with a sensible design of the contour of the guide surface, which effect is also obtained during or after the adjustment of the strip during operation remains. This should make it possible to use the bar as early as possible at low dry contents of the material to be treated, without the material web being compressed. One goal is to achieve a good formation with the best possible quality and to see through the formed paper sheet by using the bar. The adjustability should be ensured with relatively simple and reliable means of operation.

Diese Aufgabe ist erfindungsgemäß durch die im Kennzeichen des Patentanspruchs 1 angegebenen Maßnahmen erfüllt.This object is achieved by the measures specified in the characterizing part of patent claim 1.

Bei der erfindungsgemäßen Verstellungsweise der Leiste bei dem gleichzeitigen Heben und Neigen des Druckteils mit der sinnvoll gestalteten Führungsfläche bleiben die vorgesehenen Abstände zwischen dem jeweiligen Sieb und der Führungsfläche in allen Punkten im wesentlichen erhalten, so daß die gewünschten Druckveränderungen bei und nach der Verstellung des Druckteils wie gewünscht erfolgen. Dadurch kann die Materialbahn zwischen den Sieben schonend druckbehandelt werden, ohne beschädigt oder beeinträchtigt zu werden. So können die erfindungsgemäßen Leisten schon bei niedrigen Trockengehalten der Matenalbalin in der Blattbildungszone eingesetzt werden. Eine gute Formation zu einem Papierblatt mit milchglasartiger Durchsicht ist damit erreichbar. Eine Verstellung der Leiste ist mit erprobten Mitteln gewährleistet.When adjusting the bar according to the invention while simultaneously lifting and tilting the pressure part with the sensibly designed guide surface, the intended distances between the respective screen and the guide surface are essentially retained in all points, so that the desired pressure changes during and after the adjustment of the pressure part such as desired. As a result, the material web between the screens can be gently pressure treated without being damaged or impaired. Thus, the strips according to the invention can be used in the sheet formation zone even at low dry contents of the material albalin. This is a good formation for a sheet of paper with a frosted glass-like view reachable. An adjustment of the bar is guaranteed with proven means.

In den Unteransprüchen werden sinnvolle Ausführungsbeispiele des Erfindungsgegenstandes gekennzeichnet.Sensible exemplary embodiments of the subject matter of the invention are characterized in the subclaims.

Im weiteren werden der Erfindungsgegenstand und seine Vorteile naher beschrieben und erklärt. Die Beschreibung bezieht sich auf eine Zeichnung, in welcher zeigen:

  • Fig. 1 einen Teil einer Blattbildungszone mit erfindungsgemäßen Leisten im Querschnitt,
  • Fig. 2 bis 4 weitere Ausführungsbeispiele und
  • Fig. 5 eine Anpreßeinheit mit erfindungsgemäßen Leisten von einer Seite gesehen.
The subject matter of the invention and its advantages are described and explained in more detail below. The description refers to a drawing, in which:
  • 1 shows a part of a sheet formation zone with strips according to the invention in cross section,
  • 2 to 4 further embodiments and
  • Fig. 5 seen a pressure unit with strips according to the invention from one side.

In einer teilweise dargestellten Blattbildungszone einer Papiermaschine sind Leisten 1 vorgesehen. Jede Leiste 1 ist quer zur Maschinenlaufrichtung, die mit einem Pfeil angegeben ist, angeordnet. Sie ist zum Führen von Sieben 2 bzw. 3 geeignet, zwischen welchen eine Materialbahn 4 durch variable Druckbehandlung, ausgehend von den Leisten, geformt wird. Die Leisten 1 sind relativ zu den Sieben 2 bzw. 3 einstellbar und am Teil 12 einer relativ zu den Sieben bzw. zu der Materialbahn 4 positionierbaren Anpreßeinheit durchbiegungsfest abgestützt. Die den Sieben 2 bzw. 3 zugewandte Führungsfläche 5 der Leiste 1 hat im Querschnitt eine sinnvolle Kontur, durch welche Formgebung steile Druckgradienten an der Einlauf- wie an der Auslaufseite der Führungsfläche vermieden werden sollen, wobei an der Einlaufseite ein Druckanstieg erreicht werden soll. An der Gegenseite der Leisten 1 sind an den Sieben 2 bzw. 3 in dem dargestellten Beispiel Stützelemente 14 vorgesehen, die mit den Leisten 1 bei der Druckbehandlung der Materialbahn 4 zusammenwirken.In a partially shown sheet formation zone of a paper machine, strips 1 are provided. Each bar 1 is arranged transversely to the machine direction, which is indicated by an arrow. It is suitable for guiding screens 2 and 3, between which a material web 4 is formed by variable pressure treatment, starting from the strips. The strips 1 can be adjusted relative to the sieves 2 and 3 and are supported on part 12 of a pressing unit that can be positioned relative to the sieves or to the material web 4 in a deflection-resistant manner. The guide surface 5 of the bar 1 facing the screens 2 or 3 has a useful contour in cross-section, by means of which shape steep pressure gradients on the inlet and outlet sides of the guide surface are to be avoided, a pressure increase being to be achieved on the inlet side. On the opposite side of the strips 1, support elements 14 are provided on the screens 2 and 3 in the example shown, which cooperate with the strips 1 during the pressure treatment of the material web 4.

Die Leiste 1 weist ein Stützteil 6 auf, das an dem Teil 12 befestigt ist und ein Druckteil 7 mit der Führungsfläche 5 mit einer sinnvollen Kontur. Die Position des Druckteils ist mittels einer Anpreßvorrichtung 8, die an dem Stützteil 6 abgestützt ist, in Richtung relativ zu den Sieben 2 bzw. 3 verstellbar. Wie in dem Beispiel ausgeführt, weist die Anpreßvorrichtung ein mit einem Druckmedium - Gas oder Flüssigkeit - beaufschlagbares Anpreßelement 9 auf, das an dem Stützteil 6 abgestützt ist und auf das Druckteil 7 wirkt. In dem Beispiel ist das Anpreßelement 9 ein mit einem Druckmedium beaufschlagbarer und damit verformbarer Schlauch. Dieser ist in dem Stützteil 6 eingebettet, so daß seine durch die Beaufschlagung verursachte Verformung - in dem Falle eine kleinere oder größere Wölbung - im Querschnitt gesehen auf das Druckteil zu dessen Positionierung relativ zum Stützteil 6 einwirkt.The strip 1 has a support part 6 which is fastened to the part 12 and a pressure part 7 with the guide surface 5 with a meaningful contour. The position of the pressure part is in the direction by means of a pressure device 8, which is supported on the support part 6 adjustable relative to sieves 2 and 3. As stated in the example, the pressure device has a pressure element 9 which can be acted upon with a pressure medium - gas or liquid - which is supported on the support part 6 and acts on the pressure part 7. In the example, the pressure element 9 is a hose that can be acted upon with a pressure medium and thus deformable. This is embedded in the support part 6, so that its deformation caused by the action - in the case of a smaller or larger curvature - acts in cross-section on the pressure part to position it relative to the support part 6.

Zwischen dem Stützteil 6 und dem Druckteil 7 ist eine Verbindung 10 vorgesehen, welche beim Bewegen des Druckteils 7 relativ zum Stützteil 6 mit Hilfe der Anpreßvorrichtung 8 ein gleichzeitiges, dieser Bewegung entsprechendes Neigen des Druckteils 7 bzw. seiner Führungsfläche 5 relativ zu den Sieben 2 bzw. 3 und zu dem Stützteil 6 bewirkt, wobei die Schwenkachse in Richtung der Leiste verläuft. Diese Verbindung kann einen Drehpunkt 15 aufweisen, in welchem das Druckteil drehbar ist, wie in Fig. 2 dargestellt. Demselben Zweck könnte auch eine Blattfeder an dieser Stelle dienen. Ist das Druckteil 7 aus einem Kunststoff hergestellt, z.B. aus Polyäthylen, kann, wie es in Fig. 1 gezeigt ist, die Verbindung 10 aus demselben Material und ein Teil des Druckteils 7 sein und dabei eine Knickstelle aufweisen, die dann als der oben erwähnte Drehpunkt 15 wirkt.Between the support part 6 and the pressure part 7, a connection 10 is provided, which when the pressure part 7 is moved relative to the support part 6 with the aid of the pressing device 8, a simultaneous inclination of the pressure part 7 or its guide surface 5 corresponding to this movement relative to the sieves 2 or 3 and to the support part 6, the pivot axis running in the direction of the bar. This connection can have a fulcrum 15, in which the pressure part can be rotated, as shown in FIG. 2. A leaf spring at this point could also serve the same purpose. Is the pressure part 7 made of a plastic, e.g. made of polyethylene, as shown in FIG. 1, the connection 10 may be made of the same material and part of the pressure part 7 and may have a kink, which then acts as the pivot point 15 mentioned above.

Ist das Druckteil 7 aus einem relativ weichen und flexiblen Kunststoff, (so wird empfohlen, mindestens einen Abschnitt der Führungsfläche, wo an ihrer Kontur eine Abriebsgefahr zum Sieb hin zu erwarten ist, mit einer integrierten abriebfesten Schicht, z.B. Keramikeinlage, zu versehen. Ein Beispiel davon ist in Fig. 2 gezeigt, wo die Keramikeinlage mit 11 bezeichnet ist.If the pressure part 7 is made of a relatively soft and flexible plastic (it is recommended to provide at least a section of the guide surface where there is a risk of abrasion to the screen due to its contour) with an integrated abrasion-resistant layer, for example ceramic insert. An example of which is shown in Fig. 2, where the ceramic insert is designated 11.

Vorteilhaft ist es, die Leisten 1 in einer Anpreßeinheit 12 für einen Doppelsiebformer einer Papiermaschine zu verwenden. Da werden sie in Maschinenlaufrichtung hintereinander angeordnet und so auf einem Gestell 13 zusammengefaßt und befestigt, wie das in Fig. 5 gezeigt ist. Das Gestell 13 ist zum Positionieren der Leistenanordnung relativ zu den Sieben 2 bzw. 3 anhebbar und neigbar ausgeführt. Dazu dienen Druckbalken 16 und Führung 17 am Gestell 13. Für die Auswechselbarkeit der Leisten 1 in so einer Anpreßeinheit ist es von Vorteil, wenn die Leisten von der Seite des Gestells 13 her einschiebbar sind. Dazu dienen T-Führungen 18, welche besonders deutlich in den Fig. 1 bis 4 zu sehen sind. Von Vorteil ist es auch, wenn die Druckteile 7 separat von den Stützteilen 6 zu den Stützteilen 6 von der Seite des Gesteils 13 her einschiebbar sind. Damit können Druckteile mit verschiedener Führungsfläche entsprechend verschiedenem technologischen Bedarf verwendet und leicht gewechselt werden.It is advantageous to use the strips 1 in a pressing unit 12 for a twin wire former of a paper machine. Since they are arranged one behind the other in the machine running direction and thus combined and fastened on a frame 13, as shown in FIG. 5. The frame 13 is for positioning the bar arrangement can be raised and tilted relative to sieves 2 and 3. Pressure bars 16 and guide 17 on the frame 13 serve this purpose. For the interchangeability of the strips 1 in such a pressing unit, it is advantageous if the strips can be inserted from the side of the frame 13. T-guides 18 are used for this purpose, which can be seen particularly clearly in FIGS. 1 to 4. It is also advantageous if the pressure parts 7 can be inserted separately from the support parts 6 to the support parts 6 from the side of the part 13. This allows pressure parts with different guide surfaces to be used in accordance with different technological requirements and easily replaced.

Die Druckteile 7 können also an die Siebe 2 bzw. 3 angepreßt werden. Der zwischen den Sieben entstehende Druck wird von den Stützelementen 14 an der Gegenseite aufgefangen. Durch das Verstellen kann so die Position des Druckteiles 7 den verschiedenen Suspensionshöhen zwischen den Sieben angepaßt werden.The pressure parts 7 can thus be pressed against the screens 2 or 3. The pressure generated between the sieves is absorbed by the support elements 14 on the opposite side. By adjusting the position of the pressure part 7 can be adapted to the different suspension heights between the sieves.

Bei Erhöhung des Druckes in dem Anpreßelement 9 wird das betreffende Sieb verstärkt in Richtung zum Stützelement 14 gedrückt. Dadurch erfährt die Suspension zwischen den Sieben einen erhöhten Druck. Der ausgepreßte wässrige Teil der Suspension haftet als Film am Sieb und wird etwa mit der Siebgeschwindigkeit in den Einlaufkeil zwischen der Führungsfläche und dem Sieb transportiert und dort auch teilweise zurück umgelenkt. Dadurch wird in diesem Bereich ein Druckanstieg erzeugt, der eine sanfte Vorbehandlung der Suspension zwischen den Sieben bewirkt. Ein Teil des Filmes wird als Gleitfilm zwischen dem Sieb und der Führungsfläche mitgeführt und wird am Ende der Führungsfläche abgezogen. Bei höherer Siebgeschwindigkeit kann der Druck im Anpreßelement 9 einfach erhöht werden.When the pressure in the pressure element 9 is increased, the sieve in question is increasingly pressed in the direction of the support element 14. This causes the suspension between the screens to experience increased pressure. The squeezed aqueous part of the suspension adheres to the sieve as a film and is transported at about the sieving speed into the inlet wedge between the guide surface and the sieve and also partially deflected back there. This creates a pressure increase in this area, which causes a gentle pretreatment of the suspension between the sieves. Part of the film is carried as a sliding film between the screen and the guide surface and is pulled off at the end of the guide surface. At higher sieving speeds, the pressure in the pressure element 9 can simply be increased.

Die in Maschinenlaufrichtung ansteigende Kontur der Führungsfläche 5 bildet mit dem Sieb einen Druckkeil. Die sinnvoll zu gestaltende Kontur der Führungsfläche kann gerade, konkave oder konvexe Abschnitte aufweisen. Der spitze Winkel zwischen dem Sieb und dem betreffenden Konturabschnitt kann zwischen 10 Minuten bis 20 Grad liegen, wobei hier die Kontur auch stufenförmig sein kann. Die eigentliche Anpreßfläche der Kontur, die von dem Sieb bestrichen wird, kann gerade oder gebogen - konkav oder konvex - sein. Die Kontur kann auch einen oder mehrere Wendepunkte aufweisen. Von allen diesen Möglichkeiten der sinnvollen Gestaltung der Kontur der Führungsfläche 5 sind in der Zeichnung nur einige Beispiele dargestellt. Siehe dazu die Führungsflächen 5 in Fig. 1 bis 4.The contour of the guide surface 5, which rises in the machine direction, forms a pressure wedge with the sieve. The contour of the guide surface that can be designed meaningfully can have straight, concave or convex sections. The acute angle between the sieve and the contour section in question can be between 10 minutes and 20 degrees, the contour here also being stepped. The actual contact surface the contour that is covered by the screen can be straight or curved - concave or convex. The contour can also have one or more turning points. Only a few examples are shown in the drawing of all these possibilities for the sensible design of the contour of the guide surface 5. See the guide surfaces 5 in FIGS. 1 to 4.

Die erfindungsgemäßen Leisten können in einer von unten wie von oben relativ zu den Sieben wirkenden Anpreßeinheit verwendet werden. Letztere Möglichkeit zeigen an Beispielen die Fig. 3 und 4. Die Gegenseite zu den Leisten 1 kann jegliche bekannte Kontur, bzw. Konturen haben. Es kann ein flacher, konvexer oder konkaver feststehender Schuh sein oder auch eine offene oder geschlossene Formierwalze oder eine Saugwalze. Die Leisten 1 sind in allen bekannten Formen einsetzbar. Z.B. in den Apparaten, die aus der DE - 38 30 683 A 1 bekannt sind. Der große Vorteil ist, daß sich entlang der Blattbildungszone in einfacher Weise verschiedene Behandlungszonen einstellen lassen. Z.B. ist es oft vorteilhaft, am Anfang eine weichere Formierzone und am Ende eine härtere Formierzone einzustellen.The strips according to the invention can be used in a pressure unit acting from below as from above relative to the sieves. 3 and 4 show the latter possibility using examples. The opposite side to the strips 1 can have any known contour or contours. It can be a flat, convex or concave fixed shoe or an open or closed forming roller or a suction roller. The strips 1 can be used in all known forms. E.g. in the apparatuses known from DE - 38 30 683 A1. The great advantage is that different treatment zones can be easily set along the sheet formation zone. E.g. it is often advantageous to set a softer forming zone at the beginning and a harder forming zone at the end.

Mit diesen Leisten läßt sich der Druckgradient am Einlauf zur Leiste und der Druck zwischen den Sieben für jeden Entwässerungsbedarf im Formierbereich wunschgemäß einstellen, womit eine optimale, gleichmäßige Formation erzielbar ist. Damit ist der Einsatz der Leisten 1 auch im Vorderbereich der Blattformierung im Doppelsieb möglich, wo das Material niedrigen Trockengehalt aufweist, ohne daß ein Verdrücken der Bahn entsteht. Es kann so eine Blattqualität über das bisherige Maß hinaus erreicht werden, wie z.B. die milchglasartige Durchsicht ohne Festigkeitsverlust der Bahn.With these strips, the pressure gradient at the inlet to the strip and the pressure between the sieves can be set as desired for every dewatering requirement in the forming area, so that an optimal, uniform formation can be achieved. This means that the strips 1 can also be used in the front area of the sheet formation in the twin wire, where the material has a low dry content without the web being pressed. Sheet quality can thus be achieved beyond the previous level, e.g. the frosted glass-like view without loss of strength of the web.

Claims (9)

1. Leiste (1) für die Blattbildungszone einer Dopplsieb-Papiermaschine, die quer zur Maschinenlaufrichtung (Pfeil) durchbiegungssteif angeordnet und zum Führen der Siebe (2 und 3) einstellbar ist, zwischen welchen Sieben eine Materialbahn (4) zum Blatt geformt wird, wobei die Leiste (1) eine den Sieben zugewandte Führungsfläche (5) aufweist, dadurch gekennzeichnet, daß die Leiste (1) ein Stützte (6) und ein mit der Führungsfläche (5) versehenes Druckteil (7) enthält, wobei das Druckteil (7) mittels einer an dem Stützte (6) abgestützten Anpreßvorrichtung (8) relativ zu den Sieben (2 bzw. 3) und zu dem Stützteil (6) durch gleichzeitiges Heben und Neigen um eine in Richtung der Leiste (1) verlaufende Schwenkachse verstellbar ist.1. bar (1) for the sheet formation zone of a Dopplsieb paper machine, which is arranged transverse to the machine direction (arrow) deflection-resistant and adjustable for guiding the screens (2 and 3), between which screens a material web (4) is formed into the sheet, whereby the bar (1) has a guide surface (5) facing the sieves, characterized in that the bar (1) contains a support (6) and a pressure part (7) provided with the guide surface (5), the pressure part (7) can be adjusted by means of a pressing device (8) supported on the support (6) relative to the screens (2 or 3) and to the support part (6) by simultaneous lifting and tilting about a pivot axis running in the direction of the bar (1). 2. Leiste nach Anspruch 1, dadurch gekennzeichnet, daß die Anpreßvorrichtung(8) ein mit einem Druckmedium beaufschlagbares Anpreßelement (9) aufweist, das an dem Stützteil (6) abgestützt ist und auf das Druckteil (7) wirksam ist.2. Strip according to claim 1, characterized in that the pressing device (8) has a pressurizable with a pressure medium pressure element (9) which is supported on the support part (6) and is effective on the pressure part (7). 3. Leiste nach Anspruch 2, dadurch gekennzeichnet, daß das Anpreßelement (9) ein mittels eines Druckmediums beaufschlagbarer und verformbarer Schlauch ist, der in dem Stützteil (6) eingebettet ist, wobei seine Verformung auf das Druckteil (7) wirksam ist.3. Strip according to claim 2, characterized in that the pressing element (9) is a pressurizable and deformable hose by means of a pressure medium, which is embedded in the support part (6), its deformation on the pressure part (7) being effective. 4. Leiste nach Anspruch 1, dadurch gekennzeichnet, daß die Führungsfläche (5) an der, in Laufrichtung gesehen, vorderen Stelle des Zusammentreffens mit dem Sieb (2 oder 3) einen Winkel von 10 Minuten bis 20 Grad bildet.4. bar according to claim 1, characterized in that the guide surface (5) at the, viewed in the direction of travel, the front point of the meeting with the sieve (2 or 3) forms an angle of 10 minutes to 20 degrees. 5. Leiste nach Anspruch 1, dadurch gekennzeichnet, daß eine Verbindung (10) zwischen dem Stützteil (6) und dem Druckteil (7) vorgesehen ist, welche beim Bewegen des Druckteils (7) relativ zum Stützteil (6) mittels der Anpreßvorrichtung (8) den Winkel zwischen dem Druckteil (7) und den Sieben (2 und 3) sowie zwischen dem Druckteil (7) und dem Stützteil (6) verändert.5. bar according to claim 1, characterized in that a connection (10) between the support part (6) and the pressure part (7) is provided, which when moving the pressure part (7) relative to the support part (6) by means of the pressing device (8 ) the angle between the pressure part (7) and the sieves (2 and 3) and between the pressure part (7) and the support part (6) changed. 6. Leiste nach Anspruch 1, dadurch gekennzeichnet, daß der Druckteil (7) aus einem Kunststoff, wie z.B. Polyäthylen, hergestellt ist und an einem Abschnitt der Führungsfläche (5) mit einer integrierten Keramikeinlage (11) versehen ist.6. Strip according to claim 1, characterized in that the pressure part (7) is made of a plastic, such as polyethylene, and is provided on a portion of the guide surface (5) with an integrated ceramic insert (11). 7. Anpreßeinheit (12) für einen Doppelsiebformer einer Papiermaschine, gekennzeichnet durch Anwendung einer Anzahl der Leisten (1) nach Anspruch 1, die in Maschinenlaufrichtung hintereinander angeordnet sind und an einem Gestell (13) zusammengefaßt sind, das zum Positionieren relativ zu den Sieben (2 und 3) hebbar und neigbar ausgeführt ist.7. pressure unit (12) for a twin wire former of a paper machine, characterized by the use of a number of the strips (1) according to claim 1, which are arranged one behind the other in the machine direction and are combined on a frame (13) which is used for positioning relative to the screens ( 2 and 3) can be raised and tilted. 8. Anpreßeinheit (12) nach Anspruch 6, dadurch gekennzeichnet, daß die Leisten (1) von der Seite des Gestells (12) her einschiebbar sind und daß die Druckteile (7) zu den Stützteilen (6) einschiebbar sind.8. pressure unit (12) according to claim 6, characterized in that the strips (1) from the side of the frame (12) can be inserted and that the pressure parts (7) to the support parts (6) can be inserted. 9. Anpreßeinheit für einen Doppelsiebformer einer Papiermaschine, gekennzeichnet durch Anwendung einer Anzahl der Leisten (1) nach Anspruch 1, welche derart in Maschinenlaufrichtung hintereinander angeordnet sind, daß sie die Siebe (2 und 3) im wesentlichen horizontal führen können.9. pressing unit for a twin wire former of a paper machine, characterized by using a number of the strips (1) according to claim 1, which are arranged one behind the other in the machine direction that they can guide the screens (2 and 3) substantially horizontally.
EP90110333A 1989-09-02 1990-05-31 Foil blade for the forming section of a papermaking machine Expired - Lifetime EP0416219B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3929265 1989-09-02
DE3929265A DE3929265C2 (en) 1989-09-02 1989-09-02 Strip for sheet formation zone of a paper machine

Publications (2)

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EP0416219A1 true EP0416219A1 (en) 1991-03-13
EP0416219B1 EP0416219B1 (en) 1994-11-30

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EP90110333A Expired - Lifetime EP0416219B1 (en) 1989-09-02 1990-05-31 Foil blade for the forming section of a papermaking machine

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US (1) US5061347A (en)
EP (1) EP0416219B1 (en)
AT (1) ATE114753T1 (en)
CA (1) CA2022182A1 (en)
DE (1) DE3929265C2 (en)
ES (1) ES2066906T3 (en)
FI (1) FI903374A0 (en)

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Also Published As

Publication number Publication date
CA2022182A1 (en) 1991-03-03
FI903374A0 (en) 1990-07-04
US5061347A (en) 1991-10-29
DE3929265A1 (en) 1991-03-28
ES2066906T3 (en) 1995-03-16
ATE114753T1 (en) 1994-12-15
EP0416219B1 (en) 1994-11-30
DE3929265C2 (en) 1997-05-07

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