EP0881327B1 - Press blanket for a press section - Google Patents

Press blanket for a press section Download PDF

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Publication number
EP0881327B1
EP0881327B1 EP98106892A EP98106892A EP0881327B1 EP 0881327 B1 EP0881327 B1 EP 0881327B1 EP 98106892 A EP98106892 A EP 98106892A EP 98106892 A EP98106892 A EP 98106892A EP 0881327 B1 EP0881327 B1 EP 0881327B1
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EP
European Patent Office
Prior art keywords
grooves
press
blind holes
flutes
press cover
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98106892A
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German (de)
French (fr)
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EP0881327A3 (en
EP0881327A2 (en
Inventor
Uwe Matuschczyk
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 Patent GmbH
Original Assignee
Voith Paper Patent GmbH
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Publication date
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Publication of EP0881327A2 publication Critical patent/EP0881327A2/en
Publication of EP0881327A3 publication Critical patent/EP0881327A3/en
Application granted granted Critical
Publication of EP0881327B1 publication Critical patent/EP0881327B1/en
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D21F3/0227—Belts or sleeves therefor
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/08—Pressure rolls
    • D21F3/086—Pressure rolls having a grooved surface

Definitions

  • the present invention relates to a press jacket for a Press device for dewatering a material web in one Press nip, in particular a paper web in a shoe press, according to the preamble of claim 1.
  • Such a press jacket is known for example from DE-A-4401621.
  • Blind holes have a higher storage volume than grooves, however, the disadvantage that a large in the press nip hydraulic pressure is built up. This disadvantage occurs not with grooves, but only a smaller one Have water storage volume.
  • the invention has for its object a press jacket of the type mentioned at the outset in such a way that a high level is maintained while maintaining sufficient jacket strength or while ensuring good jacket durability Water storage volume with low hydraulic pressure in the Press nip is given.
  • the blind holes ensure a high level Water retention capacity.
  • the hydraulic pressure in the press nip is also reduced, because the blind holes over the grooves with the sections are connected before and after the press nip, i.e. on Atmospheric pressure are connected. That in the blind holes Water absorbed can therefore partially through the grooves drain off, so that the emergence of a large hydraulic Pressure in the blind holes is prevented.
  • the grooves have a length which is larger than the press nip length. This is always connected to atmospheric pressure.
  • the Grooves can also be used across the entire direction of web travel measured press shell length extended grooves and be designed in particular as endless grooves. This is from easy to manufacture and allows connection at the same time several blind holes arranged one behind the other at atmospheric pressure.
  • the grooves can be single, double or Form multiple helix.
  • Helical grooves are also easy to manufacture and improve also the properties of the roll shell.
  • the distances between adjacent blind holes can be in the be essentially the same.
  • the distances adjacent blind holes should not differ from each other by more than 10%. This makes the drainage performance special good and even.
  • the grooves or grooves parallel to each other.
  • the Distances and the width of the grooves or grooves each essentially the same with each other. Even the uniformity the arrangement of the grooves or grooves increases the uniformity the drainage.
  • grooves are less than or equal to the diameter of the Blind holes. This ensures that each blind hole is connected to at least one groove or groove.
  • the width of the grooves or grooves is preferably smaller or equal to the diameter of the blind holes.
  • the blind holes can advantageously the main storage volume for form the water intake.
  • the width of the grooves or grooves can be kept low as it is essentially serve to reduce the hydraulic pressure. A water intake from the paper web through the grooves or grooves basically not necessary so that the grooves or grooves can have a very narrow opening.
  • the depth the blind holes are greater than the depth of the attached ones Grooves or grooves.
  • This configuration is also a result allows the main storage volume through the Blind holes is formed.
  • the grooves or grooves can thereby be formed with a shallow depth as long as only it is ensured that sufficient water from the blind holes can flow out of the press nip area to a high Avoid hydraulic pressure. The strength of the press jacket this increases the risk of breakage or cracking reduced.
  • the blind holes are arranged along lines whose pitch angle ⁇ B to the web running direction is between 5 ° and approximately 15 °.
  • Such an arrangement of the blind holes for drainage has proven to be favorable.
  • the strength of the press jacket is relatively little affected by this and the risk of cracks spreading in the web running direction is reduced.
  • the grooves or grooves follow a line whose pitch angle ⁇ R corresponds to the pitch angle ⁇ B of the blind holes.
  • the grooves or grooves are arranged so that the lines that the blind holes and the grooves or grooves follow coincide. This results in an arrangement in which the grooves or grooves are connected centrally to the blind holes.
  • the water drainage is optimal and the press jacket durability is also good.
  • the grooves or grooves follow a line whose pitch angle ⁇ R is between 0.1 ° and approx. 3 °.
  • the grooves or grooves run at a different angle than the blind holes.
  • the connection of the grooves or grooves to the blind holes varies here via the press jacket.
  • the open area of the roll shell in the press area is preferably more than 30% of the total area of the press jacket in this area. This advantageously makes a high one Drainage performance guaranteed.
  • the Blind holes at least two different diameters.
  • the blind holes with different diameters preferably evenly over the surface of the press jacket distributed, in particular by using blind holes Larger and smaller diameters arranged alternately become. This will increase the water absorption without excessive reduction of the webs between the blind holes and thus achieved without too much loss of strength.
  • the blind holes 1 of this variant of a press jacket according to the invention are evenly distributed over the surface 2 of the press jacket.
  • the blind holes 1 each have essentially the same distances a 1 , a 2 , a 3 from the adjacent blind holes 1.
  • the deviation of the distances a 1 to a 3 is approximately 10% or less.
  • the blind holes 1 are arranged along lines 3 which enclose an angle ⁇ B with the web running direction 4.
  • the angle ⁇ B is preferably between approximately 5 ° and approximately 15 °.
  • the grooves or grooves connected to the blind holes 1 are not shown in FIG. 1.
  • Fig. 2 shows an embodiment of the press jacket according to the invention, in which the blind holes 1 are also arranged along lines 3, which have an angle between approximately 5 ° and approximately 15 ° to the web running direction.
  • the blind holes 1 there are grooves 5, which likewise run along lines 6, which enclose an angle ⁇ R between approximately 5 ° and approximately 15 ° to the web running direction 4.
  • the lines 6 coincide with the lines 3, so that the grooves 5 are each connected centrally to the blind holes 1.
  • the grooves 5 are at the same distance D from one another and the width b of the grooves is smaller than the diameter d of the blind holes 1 same distance a 1 , a 2 , a 3 .
  • the grooves 5 are also parallel to each other arranged at the same distance D.
  • the distance D between the edges of adjacent grooves 5 is approximate equal to or less than the diameter d of the blind holes 1.
  • the blind holes are not on lines 3 that with the lines 6, along which the grooves 5 extend, coincide, this ensures that each blind hole 1 is connected to at least one groove 5.
  • the grooves 5 can be formed in all exemplary embodiments, in particular as endless grooves or as helical grooves.
  • the grooves 5 can also form a double or multiple screw line.
  • the blind holes 1 can be evenly or randomly distributed over the surface 2 of the press cover. Their depth is preferably greater than the depth of the grooves 5.
  • the grooves 5 can also form a small angle ⁇ R with the circumferential direction 4, in particular between approximately 0.1 ° and approximately 0.3 ° ,
  • the open area of the roll shell resulting from the sum of the opening cross sections of the blind holes 1 and the grooves 5 is preferably more than 30% of the total area, at least in the area of the press nip.
  • the overall result is a press jacket with very good drying properties, because of a very good water absorption and drainage given is.
  • the blind holes 1 ensure in particular for a large storage volume and the grooves 5 for removing the water from the press nip, so that the Creation of a high hydraulic pressure in the press nip is avoided.
  • the production of the press jacket according to the invention is comparatively simple, and the press jacket is characterized by a high durability.

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  • Paper (AREA)

Description

Die vorliegende Erfindung betrifft einen Preßmantel für eine Preßvorrichtung zur Entwässerung einer Materialbahn in einem Preßspalt, insbesondere eine Papierbahn in einer Schuhpresse, gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to a press jacket for a Press device for dewatering a material web in one Press nip, in particular a paper web in a shoe press, according to the preamble of claim 1.

Ein derartiger Preßmantel ist beispielsweise aus DE-A-4401621 bekannt.Such a press jacket is known for example from DE-A-4401621.

Es ist bekannt, Preßmäntel für Schuhpressen mit Sacklöchern zur Wasseraufnahme zu versehen, um die Trockenleistung der Presse zu erhöhen. Ebenso ist es bekannt, die Trockenleistung durch Rillen in der Oberfläche der Preßmäntel zu erhöhen.It is known to press jackets for shoe presses with blind holes to provide water absorption to the drying performance of the Press increase. It is also known the drying performance by increasing grooves in the surface of the press sleeves.

Sacklöcher haben gegenüber Rillen zwar ein höheres Speichervolumen, jedoch den Nachteil, daß im Preßspalt ein großer hydraulischer Druck aufgebaut wird. Dieser Nachteil tritt bei Rillen nicht auf, die dafür aber nur ein geringeres Wasserspeichervolumen aufweisen.Blind holes have a higher storage volume than grooves, however, the disadvantage that a large in the press nip hydraulic pressure is built up. This disadvantage occurs not with grooves, but only a smaller one Have water storage volume.

Der Erfindung liegt die Aufgabe zugrunde, einen Preßmantel der eingangs genannten Art so weiterzubilden, daß unter Aufrechterhaltung einer hinreichenden Mantelfestigkeit bzw. unter Gewährleistung einer guten Mantelhaltbarkeit ein hohes Wasserspeichervolumen mit geringem hydraulischem Druck im Preßspalt gegeben ist.The invention has for its object a press jacket of the type mentioned at the outset in such a way that a high level is maintained while maintaining sufficient jacket strength or while ensuring good jacket durability Water storage volume with low hydraulic pressure in the Press nip is given.

Diese Aufgabe wird gemäß den Merkmalen der Ansprüche 1, 2 oder 3 gelöst.This task will according to the Features of claims 1, 2 or 3 solved.

Die Sacklöcher gewährleisten, wie bereits erwähnt, ein hohes Wasserspeichervolumen. Durch den Anschluß der Sacklöcher an in Bahnlaufrichtung länger als die Preßspaltlänge erstreckte Nuten wird zugleich der hydraulische Druck im Preßspalt reduziert, da die Sacklöcher über die Nuten mit den Abschnitten vor und nach dem Preßspalt in Verbindung stehen, also an Atmosphärendruck angeschlossen sind. Das in den Sacklöchern aufgenommene Wasser kann daher teilweise über die Nuten abfließen, so daß das Entstehen eines großen hydraulischen Druckes in den Sacklöchern verhindert ist.As already mentioned, the blind holes ensure a high level Water retention capacity. By connecting the blind holes to extended in the web running direction longer than the press nip length Grooves, the hydraulic pressure in the press nip is also reduced, because the blind holes over the grooves with the sections are connected before and after the press nip, i.e. on Atmospheric pressure are connected. That in the blind holes Water absorbed can therefore partially through the grooves drain off, so that the emergence of a large hydraulic Pressure in the blind holes is prevented.

Grundsätzlich reicht es aus, wenn die Nuten eine Länge aufweisen, die größer ist als die Preßspaltlänge. Dadurch ist stets ein Anschluß an Atmosphärendruck gewährleistet. Die Nuten können aber auch als über die gesamte in Bahnlaufrichtung gemessene Preßmantellänge erstreckte Rillen und insbesondere als Endlosrillen ausgebildet sein. Dies ist von der Herstellung her einfach und ermöglicht einen Anschluß gleichzeitig mehrerer hintereinander angeordneter Sacklöcher an Atmosphärendruck.Basically, it is sufficient if the grooves have a length which is larger than the press nip length. This is always connected to atmospheric pressure. The Grooves can also be used across the entire direction of web travel measured press shell length extended grooves and be designed in particular as endless grooves. This is from easy to manufacture and allows connection at the same time several blind holes arranged one behind the other at atmospheric pressure.

Nach einer anderen Ausgestaltung der Erfindung sind die Rillen schraubenlinienförmig um den Preßmantel angeordnet. Die Rillen können dabei eine Einfach-, Zweifach- oder Mehrfachschraubenlinie bilden. Schraubenlinienförmige Rillen sind ebenfalls einfach in der Herstellung und verbessern zudem die Eigenschaften des Walzenmantels.According to another embodiment of the invention Grooves arranged helically around the press jacket. The grooves can be single, double or Form multiple helix. Helical grooves are also easy to manufacture and improve also the properties of the roll shell.

Nach einer weiteren Ausgestaltung der Erfindung sind die Sacklöcher gleichmäßig über die Manteloberfläche verteilt angeordnet. Hierdurch wird eine gleichmäßige Entwässerung erreicht.According to a further embodiment of the invention Blind holes evenly distributed over the surface of the jacket arranged. This will ensure even drainage reached.

Die Abstände benachbarter Sacklöcher können untereinander im wesentlichen gleich sein. Insbesondere können die Abstände benachbarter Sacklöcher nicht mehr als 10 % voneinander abweichen. Die Entwässerungsleistung wird hierdurch besonders gut und gleichmäßig. The distances between adjacent blind holes can be in the be essentially the same. In particular, the distances adjacent blind holes should not differ from each other by more than 10%. This makes the drainage performance special good and even.

Nach einer weiteren Ausgestaltung der Erfindung verlaufen die Nuten oder Rillen parallel zueinander. Dabei sind die Abstände und die Breite der Nuten oder Rillen jeweils untereinander im wesentlichen gleich. Auch die Gleichmäßigkeit der Anordnung der Rillen oder Nuten erhöht die Gleichmäßigkeit der Entwässerung. Zudem wird die Herstellung vereinfacht.According to a further embodiment of the invention the grooves or grooves parallel to each other. Here are the Distances and the width of the grooves or grooves each essentially the same with each other. Even the uniformity the arrangement of the grooves or grooves increases the uniformity the drainage. In addition, the manufacture simplified.

Der Abstand von Kante zu Kante benachbarter Nuten oder Rillen ist nach einem ersten Aspekt der Erfindung kleiner oder gleich dem Durchmesser der Sacklöcher. Hierdurch ist gewährleistet, daß jedes Sackloch an mindestens eine Nut oder Rille angeschlossen ist.The distance from edge to edge of adjacent grooves or According to a first aspect of the invention, grooves are less than or equal to the diameter of the Blind holes. This ensures that each blind hole is connected to at least one groove or groove.

Außerdem ist die Breite der Nuten oder Rillen bevorzugt kleiner oder gleich dem Durchmesser der Sacklöcher. Die Sacklöcher können vorteilhafterweise das Hauptspeichervolumen für die Wasseraufnahme bilden. Die Breite der Nuten oder Rillen kann dadurch gering gehalten werden, da sie im wesentlichen dem Abbau des hydraulischen Druckes dienen. Eine Wasseraufnahme aus der Papierbahn durch die Nuten oder Rillen ist grundsätzlich nicht erforderlich, so daß die Nuten oder Rillen eine sehr schmale Öffnung aufweisen können.In addition, the width of the grooves or grooves is preferably smaller or equal to the diameter of the blind holes. The blind holes can advantageously the main storage volume for form the water intake. The width of the grooves or grooves can be kept low as it is essentially serve to reduce the hydraulic pressure. A water intake from the paper web through the grooves or grooves basically not necessary so that the grooves or grooves can have a very narrow opening.

Nach einer weiteren Ausgestaltung der Erfindung ist die Tiefe der Sacklöcher größer als die Tiefe der daran angeschlossenen Nuten oder Rillen. Auch diese Ausgestaltung wird dadurch ermöglicht, daß das Hauptspeichervolumen durch die Sacklöcher gebildet wird. Die Nuten oder Rillen können dadurch mit einer geringen Tiefe ausgebildet sein, solange nur gewährleistet ist, daß ausreichend Wasser aus den Sacklöchern aus dem Preßspaltbereich abfließen kann, um einen hohen Hydraulikdruck zu vermeiden. Die Festigkeit des Preßmantels wird hierdurch erhöht, die Bruch- oder Rißbildungsgefahr verringert. According to a further embodiment of the invention, the depth the blind holes are greater than the depth of the attached ones Grooves or grooves. This configuration is also a result allows the main storage volume through the Blind holes is formed. The grooves or grooves can thereby be formed with a shallow depth as long as only it is ensured that sufficient water from the blind holes can flow out of the press nip area to a high Avoid hydraulic pressure. The strength of the press jacket this increases the risk of breakage or cracking reduced.

Nach einem zweiten und dritten Aspekt der Erfindung sind die Sacklöcher längs Linien angeordnet, deren Steigungswinkel βB zur Bahnlaufrichtung zwischen 5° und ca. 15° beträgt. Eine derartige Anordnung der Sacklöcher zur Entwässerung hat sich als günstig herausgestellt. Insbesondere wird die Festigkeit des Preßmantels hierdurch verhältnismäßig wenig beeinträchtigt und die Gefahr des Ausbreitens von Rissen in Bahnlaufrichtung verringert.According to a second and third aspect of the invention, the blind holes are arranged along lines whose pitch angle β B to the web running direction is between 5 ° and approximately 15 °. Such an arrangement of the blind holes for drainage has proven to be favorable. In particular, the strength of the press jacket is relatively little affected by this and the risk of cracks spreading in the web running direction is reduced.

Nach dem dritten Aspekt der Erfindung folgen die Nuten oder Rillen einer Linie, deren Steigungswinkel αR mit dem Steigungswinkel βB der Sacklöcher übereinstimmt. Dabei sind die Nuten oder Rillen so angeordnet, daß die Linien, denen die Sacklöcher und die Nuten oder Rillen folgen, zusammenfallen. Hierdurch ergibt sich eine Anordnung, bei welcher die Nuten oder Rillen mittig an die Sacklöcher angeschlossen sind. Der Wasserabfluß ist hierdurch optimal und die Preßmantelhaltbarkeit ebenfalls gut.According to the third aspect of the invention, the grooves or grooves follow a line whose pitch angle α R corresponds to the pitch angle β B of the blind holes. The grooves or grooves are arranged so that the lines that the blind holes and the grooves or grooves follow coincide. This results in an arrangement in which the grooves or grooves are connected centrally to the blind holes. The water drainage is optimal and the press jacket durability is also good.

Nach dem zweiten Aspekt der Erfindung folgen die Nuten oder Rillen einer Linie, deren Steigungswinkel αR zwischen 0,1° und ca. 3° liegt. Dabei verlaufen die Nuten oder Rillen unter einem anderen Steigungswinkel als die Sacklöcher. Der Anschluß der Nuten oder Rillen an die Sacklöcher variiert hierbei über den Preßmantel.According to the second aspect of the invention, the grooves or grooves follow a line whose pitch angle α R is between 0.1 ° and approx. 3 °. The grooves or grooves run at a different angle than the blind holes. The connection of the grooves or grooves to the blind holes varies here via the press jacket.

Die offene Fläche des Walzenmantels im Preßbereich beträgt bevorzugt mehr als 30 % der Gesamtfläche des Preßmantels in diesem Bereich. Hierdurch wird vorteilhafterweise eine hohe Entwässerungsleistung gewährleistet. The open area of the roll shell in the press area is preferably more than 30% of the total area of the press jacket in this area. This advantageously makes a high one Drainage performance guaranteed.

Nach einer weiteren Ausgestaltung der Erfindung weisen die Sacklöcher mindestens zwei unterschiedliche Durchmesser auf. Hierbei sind die Sacklöcher mit unterschiedlichen Durchmessern bevorzugt über die Oberfläche des Preßmantels gleichmäßig verteilt angeordnet, insbesondere indem Sacklöcher mit größerem und kleinerem Durchmesser abwechselnd angeordnet werden. Hierdurch wird eine Erhöhung der Wasseraufnahme ohne übermäßige Verkleinerung der Stege zwischen den Sacklöchern und damit ohne allzu große Festigkeitseinbuße erreicht.According to a further embodiment of the invention, the Blind holes at least two different diameters. Here are the blind holes with different diameters preferably evenly over the surface of the press jacket distributed, in particular by using blind holes Larger and smaller diameters arranged alternately become. This will increase the water absorption without excessive reduction of the webs between the blind holes and thus achieved without too much loss of strength.

Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden nachfolgend beschrieben. Es zeigen jeweils in schematischer Darstellung,

Fig. 1
eine mögliche Anordnung der Sacklöcher eines erfindungsgemäßen Preßmantels,
Fig. 2
eine Draufsicht auf einen Teil einer Variante des erfindungsgemäßen Preßmantels,
Fig. 3
eine Draufsicht auf einen Teil noch einer Variante eines erfindungsgemäßen Preßmantels.
Embodiments of the invention are shown in the drawing and are described below. Each shows in a schematic representation
Fig. 1
a possible arrangement of the blind holes of a press jacket according to the invention,
Fig. 2
a plan view of part of a variant of the press jacket according to the invention,
Fig. 3
a plan view of part of a variant of a press jacket according to the invention.

Wie man Fig. 1 entnimmt, sind die Sacklöcher 1 dieser Variante eines erfindungsgemäßen Preßmantels gleichmäßig über die Oberfläche 2 des Preßmantels verteilt. Insbesondere weisen die Sacklöcher 1 jeweils im wesentlichen gleiche Abstände a1, a2, a3 zu den benachbarten Sacklöchern 1 auf. Die Abweichung der Abstände a1 bis a3 beträgt ca. 10 % oder weniger.1, the blind holes 1 of this variant of a press jacket according to the invention are evenly distributed over the surface 2 of the press jacket. In particular, the blind holes 1 each have essentially the same distances a 1 , a 2 , a 3 from the adjacent blind holes 1. The deviation of the distances a 1 to a 3 is approximately 10% or less.

Wie man Fig. 1 ebenfalls entnimmt, sind die Sacklöcher 1 längs Linien 3 angeordnet, die einen Winkel βB mit der Bahnlaufrichtung 4 einschließen. Der Winkel βB beträgt bevorzugt zwischen ca. 5° und ca. 15°. Die an die Sacklöcher 1 angeschlossenen Nuten oder Rillen sind in Fig. 1 nicht dargestellt.1, the blind holes 1 are arranged along lines 3 which enclose an angle β B with the web running direction 4. The angle β B is preferably between approximately 5 ° and approximately 15 °. The grooves or grooves connected to the blind holes 1 are not shown in FIG. 1.

Fig. 2 zeigt eine Ausgestaltung des erfindungsgemäßen Preßmantels, bei welcher die Sacklöcher 1 ebenfalls längs Linien 3 angeordnet sind, die einen Winkel zwischen ca. 5° und ca. 15° zur Bahnlaufrichtung aufweisen. zusätzlich zu den Sacklöchern 1 sind Rillen 5 vorhanden, die ebenfalls längs Linien 6 verlaufen, die zur Bahnlaufrichtung 4 einen Winkel αR zwischen ca. 5° und ca. 15° einschließen. Außerdem fallen, wie dargestellt, die Linien 6 mit den Linien 3 zusammen, so daß die Rillen 5 jeweils mittig an die Sacklöcher 1 angeschlossen sind.Fig. 2 shows an embodiment of the press jacket according to the invention, in which the blind holes 1 are also arranged along lines 3, which have an angle between approximately 5 ° and approximately 15 ° to the web running direction. In addition to the blind holes 1, there are grooves 5, which likewise run along lines 6, which enclose an angle α R between approximately 5 ° and approximately 15 ° to the web running direction 4. In addition, as shown, the lines 6 coincide with the lines 3, so that the grooves 5 are each connected centrally to the blind holes 1.

Wie man in Fig. 2 außerdem erkennt, weisen die Rillen 5 untereinander gleichen Abstand D auf, und ist die Breite b der Nuten kleiner als der Durchmesser d der Sacklöcher 1. Auch bei dieser Ausgestaltung weisen die Sacklöcher 1 außerdem zu den benachbarten Sacklöchern jeweils einen gleichen Abstand a1, a2, a3 auf.As can also be seen in FIG. 2, the grooves 5 are at the same distance D from one another and the width b of the grooves is smaller than the diameter d of the blind holes 1 same distance a 1 , a 2 , a 3 .

Bei der in Fig. 3 dargestellten Variante des erfindungsgemäßen Preßmantels sind die Rillen 5 ebenfalls parallel zueinander mit gleichem Abstand D angeordnet. Der Abstand D zwischen den Kanten benachbarter Rillen 5 ist hierbei ungefähr gleich oder kleiner als der Durchmesser d der Sacklöcher 1. Obwohl die Sacklöcher nicht auf Linien 3 liegen, die mit den Linien 6, längs derer sich die Rillen 5 erstrecken, zusammenfallen, ist dadurch gewährleistet, daß jedes Sackloch 1 an mindestens eine Rille 5 angeschlossen ist.In the variant of the invention shown in FIG. 3 Press casing, the grooves 5 are also parallel to each other arranged at the same distance D. The distance D between the edges of adjacent grooves 5 is approximate equal to or less than the diameter d of the blind holes 1. Although the blind holes are not on lines 3 that with the lines 6, along which the grooves 5 extend, coincide, this ensures that each blind hole 1 is connected to at least one groove 5.

Die Rillen 5 können in allen Ausführungsbeispielen, insbesondere als Endlosrillen oder als schraubenlinienförmige Rillen ausgebildet sein. Die Rillen 5 können dabei auch einen Zweifach- oder Mehrfachschraubenlinie bilden. Die Sacklöcher 1 können gleichmäßig oder auch nach dem Zufallsprinzip über die Oberfläche 2 des Preßmantels verteilt sein. Ihre Tiefe ist bevorzugt größer als die Tiefe der Rillen 5. Wie in Fig. 3 dargestellt, können die Rillen 5 auch einen kleinen Winkel αR mit der Umfangsrichtung 4 einschließen, insbesondere zwischen ca. 0,1° und ca. 0,3°. Die sich aus der Summe der Öffnungsquerschnitte der Sacklöcher 1 und der Rillen 5 ergebende offene Fläche des Walzenmantels beträgt bevorzugt mehr als 30 % der Gesamtfläche, zumindest im Bereich des Preßspaltes.The grooves 5 can be formed in all exemplary embodiments, in particular as endless grooves or as helical grooves. The grooves 5 can also form a double or multiple screw line. The blind holes 1 can be evenly or randomly distributed over the surface 2 of the press cover. Their depth is preferably greater than the depth of the grooves 5. As shown in FIG. 3, the grooves 5 can also form a small angle α R with the circumferential direction 4, in particular between approximately 0.1 ° and approximately 0.3 ° , The open area of the roll shell resulting from the sum of the opening cross sections of the blind holes 1 and the grooves 5 is preferably more than 30% of the total area, at least in the area of the press nip.

Insgesamt ergibt sich ein Preßmantel mit sehr guter Trocknungseigenschaft, da eine sehr gute Wasseraufnahme und Wasserabführung gegeben ist. Die Sacklöcher 1 sorgen dabei insbesondere für ein großes Speichervolumen und die Rillen 5 für eine Abführung des Wassers aus dem Preßspalt, so daß die Entstehung eines hohen hydraulischen Druckes im Preßspalt vermieden wird. Die Herstellung des erfindungsgemäßen Preßmantels ist vergleichsweise einfach, und der Preßmantel zeichnet sich durch eine hohe Haltbarkeit aus. The overall result is a press jacket with very good drying properties, because of a very good water absorption and drainage given is. The blind holes 1 ensure in particular for a large storage volume and the grooves 5 for removing the water from the press nip, so that the Creation of a high hydraulic pressure in the press nip is avoided. The production of the press jacket according to the invention is comparatively simple, and the press jacket is characterized by a high durability.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Sacklochblind
22
PreßmanteloberflächePreßmanteloberfläche
33
Linieline
44
BahnlaufrichtungWeb direction
55
Nut oder RilleGroove or groove
66
Linieline
bb
Breite von 5Width of 5
dd
Durchmesser von 1Diameter of 1
DD
Abstand benachbarter Nuten oder RillenDistance between adjacent grooves or grooves
a1 a 1
SacklochabstandBlind hole spacing
a2 a 2
SacklochabstandBlind hole spacing
a3 a 3
SacklochabstandBlind hole spacing

Claims (17)

  1. Press cover for a pressing apparatus for dewatering a material web in a press nip, in particular a paper web in a shoe press, which cover, at least in the pressing area, is provided with blind holes (1) to hold water, the holes opening into the surface (2) of the pressure cover which faces the press nip, the blind holes (1) being connected to grooves (5) which extend in the web running direction (4), at least in some sections, and the length of the grooves (5) in the web running direction (4) being greater than the length of the press nip, characterized in that the spacing (D) of the grooves or flutes (5) from of to edge are adjacent grooves or flutes is less than or equal to the diameter (d) of the blind holes (1).
  2. Press cover for a pressing apparatus for dewatering a material web in a press nip, in particular a paper web in a shoe press, according to the precharacterizing clause of Claim 1, characterized in that the blind holes (1) are arranged along lines (3) whose pitch angle (βB) with respect to the web running direction (4) is between 5° and 15°, and the grooves or flutes (5) follow a line whose pitch angle (αR) is between 0.1° and 3°.
  3. Press cover for a pressing apparatus for dewatering a material web in a press nip, in particular a paper web in a shoe press, according to the precharacterizing clause of Claim 1, characterized in that the blind holes (1) are arranged along lines (3) whose pitch angle (βB) with respect to the web running direction (4) is between 5° and 15°, and the grooves or flutes (5) follow a line (6) whose pitch angle (αR) coincides with the pitch angle (βB) of the blind holes (1), the lines (3, 6) followed by the blind holes (1) and the grooves or flutes (5) coinciding.
  4. Press cover according to one of the preceding claims, characterized in that the grooves are formed as flutes (5) extended over the entire length of the press cover, measured in the web running direction (4).
  5. Press cover according to Claim 4, characterized in that the flutes (5) are formed as endless flutes.
  6. Press cover according to Claim 4, characterized in that the flutes (5) run helically.
  7. Press cover according to Claim 6, characterized in that the grooves (5) form a double or multiple helix.
  8. Press cover according to one of the preceding claims, characterized in that the blind holes (1) are arranged distributed uniformly over the outer surface (2) of the press cover.
  9. Press cover according to Claim 8, characterized in that the spacings (a1, a2, a3) of adjacent blind holes (1) are substantially equal to one another.
  10. Press cover according to Claim 8 or 9, characterized in that the spacings (a1, a2, a3) of adjacent blind holes (1) do not differ from one another by more than 10%.
  11. Press cover according to one of the preceding claims, characterized in that the grooves or flutes (5) run parallel to one another.
  12. Press cover according to one of the preceding claims, characterized in that the spacings (D) and the width (b) of the grooves or flutes (5) are respectively substantially equal to one another.
  13. Press cover according to Claim 12, characterized in that the width (b) of the grooves or flutes (5) is less than or equal to the diameter (d) of the blind holes (1).
  14. Press cover according to one of the preceding claims, characterized in that the depth of the blind holes (1) is greater than the depth of the grooves or flutes (5) connected to them.
  15. Press cover according to one of the preceding claims, characterized in that the open area of the roll cover, at least in the press area, makes up more than 30% of the total area.
  16. Press cover according to one of the preceding claims, characterized in that the blind holes (1) have at least two different diameters.
  17. Press cover according to Claim 16, characterized in that the blind holes (1) with a different diameter are arranged distributed uniformly over the roll outer surface.
EP98106892A 1997-05-30 1998-04-16 Press blanket for a press section Expired - Lifetime EP0881327B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19722638A DE19722638A1 (en) 1997-05-30 1997-05-30 Press jacket for a press device
DE19722638 1997-05-30

Publications (3)

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EP0881327A2 EP0881327A2 (en) 1998-12-02
EP0881327A3 EP0881327A3 (en) 1999-02-10
EP0881327B1 true EP0881327B1 (en) 2003-06-25

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Family Applications (1)

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EP98106892A Expired - Lifetime EP0881327B1 (en) 1997-05-30 1998-04-16 Press blanket for a press section

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US (1) US6029570A (en)
EP (1) EP0881327B1 (en)
JP (1) JP4868476B2 (en)
DE (2) DE19722638A1 (en)

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CN1875148B (en) * 2003-11-03 2012-05-16 阿尔巴尼国际公司 Belt with variable grooves
RU2406792C2 (en) * 2003-11-18 2010-12-20 Олбани Интернешнл Корп. Band with chute surface used in press with plate
US8080137B2 (en) 2003-11-18 2011-12-20 Albany International Corp. Shoe press belt having a grooved surface
JP4477025B2 (en) * 2007-03-12 2010-06-09 イチカワ株式会社 Shoe press belt for papermaking
DE102009028215B3 (en) 2009-08-04 2010-09-09 Voith Patent Gmbh Combination of a press felt with a press roll cover and / or a suction roll cover for a paper machine
DE102011004565A1 (en) 2011-02-23 2012-08-23 Voith Patent Gmbh Press section of a machine for producing a fibrous web
WO2013037527A2 (en) * 2011-09-16 2013-03-21 Voith Patent Gmbh Combination of a roll cover or shoe press sleeve with a paper machine covering and use of such a combination
HUE025413T2 (en) * 2012-07-10 2016-02-29 Sca Tissue France A cloth-like textured nonwoven fabric comprising papermaking fibers, calendering roller and method of manufacturing the same
WO2017189642A1 (en) * 2016-04-26 2017-11-02 Stowe Woodward Licensco, Llc Suction roll with pattern of through holes and blind drilled holes that improves land distance
CN106192535B (en) * 2016-07-22 2017-11-14 福建省联盛纸业有限责任公司 A kind of paper pressing device
US11098450B2 (en) 2017-10-27 2021-08-24 Albany International Corp. Methods for making improved cellulosic products using novel press felts and products made therefrom
FI128550B (en) * 2019-01-25 2020-07-31 Valmet Technologies Oy Shoe press band

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Also Published As

Publication number Publication date
EP0881327A3 (en) 1999-02-10
DE59808791D1 (en) 2003-07-31
JP4868476B2 (en) 2012-02-01
DE19722638A1 (en) 1998-12-03
EP0881327A2 (en) 1998-12-02
JPH10328893A (en) 1998-12-15
US6029570A (en) 2000-02-29

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