EP1738020A1 - Wire cloth, in particular paper making wire cloth - Google Patents

Wire cloth, in particular paper making wire cloth

Info

Publication number
EP1738020A1
EP1738020A1 EP05701331A EP05701331A EP1738020A1 EP 1738020 A1 EP1738020 A1 EP 1738020A1 EP 05701331 A EP05701331 A EP 05701331A EP 05701331 A EP05701331 A EP 05701331A EP 1738020 A1 EP1738020 A1 EP 1738020A1
Authority
EP
European Patent Office
Prior art keywords
machine direction
yarn
fabric
cross
yarns
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
EP05701331A
Other languages
German (de)
French (fr)
Other versions
EP1738020B1 (en
Inventor
Wolfgang Heger
Klaus Fichter
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.)
Andritz Technology and Asset Management GmbH
Original Assignee
Andreas Kufferath GmbH and Co KG
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 Andreas Kufferath GmbH and Co KG filed Critical Andreas Kufferath GmbH and Co KG
Priority to PL05701331T priority Critical patent/PL1738020T3/en
Publication of EP1738020A1 publication Critical patent/EP1738020A1/en
Application granted granted Critical
Publication of EP1738020B1 publication Critical patent/EP1738020B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • D21F1/0027—Screen-cloths
    • D21F1/0036—Multi-layer screen-cloths

Definitions

  • the invention relates to a sieve, in particular a papermaking fabric, comprising at least two fabric layers, wherein an upper fabric layer is formed of machine direction yarns and of transverse direction yarn, wherein a lower fabric layer is formed of machine direction yarns and of transverse direction yarns, and wherein yarn bridges are formed for the individual fabric layers are that they have over a predeterminable Wegstrek- ke within a binding repeat no involvement with other threads.
  • the pulp suspension used here are mixtures of suitable fibers, fillers, chemical auxiliaries and water, which forms the predominant amount of the mixture.
  • the mentioned filtration process is also referred to in the paper industry with sheet formation and takes place in the so-called wet or sheet forming part of the paper machine.
  • gap or gap formers are used. These are characterized, inter alia, by the fact that the pulp suspension is injected directly into a gap between two paper machine sieves and dewatered by both sieves. With this type of paper machines, the filtration process could be accelerated so that today production speeds of 2000 m / min and more are possible.
  • Hygiene papers such as handkerchiefs, toilet paper, towels od.
  • the paper grades used here are characterized by particularly low basis weights, depending on the intended use between 10 and 20 g / m 2 lie.
  • graphic paper grades are between 42 and 120 g / m 2 .
  • connection of two single-layer fabrics to the papermaking fabric in which longer yarn bridges are formed by transverse yarn, is disclosed in EP 0 889 160 A1.
  • the paper side (upper side) is realized by a four-shaft twill weave and the running side (underside) by a four-shaft plain weave.
  • the connection between the two layers takes place by a connection of a paper-side machine direction yarn to a running-side transverse yarn.
  • This type of fabric is characterized by both a higher dewatering performance as well as a good fiber support due to the long thread bridges. In the known solution, it comes to a no longer acceptable mark, which is caused by the nature of the layer connection.
  • the wear potential is limited, ie the run or machine side, which is mainly formed by the machine direction threads is exposed directly to the wear and consequently it can in use Seam or sieve come. Further, the lateral bending stiffness is limited due to the four-shaft running side and a difficult to control automatic stitching caused by the parallel lower machine direction threads.
  • the invention is based on the object, while maintaining the advantages of the known sieve solutions to further improve this to the effect that in particular in the field of production of tissue papers a very high drainage performance and fiber support is given.
  • the fabric should be thin but nevertheless mechanically stable against waviness and warpage and still have good bending stiffness values in the transverse direction and ensure the possibility of an advantageous seaming for connecting the wire ends.
  • This object is achieved by a screen, in particular paper machine screen, with the features of claim 1 in its entirety.
  • the yarn bridges of the upper transverse yarns within a binding repeat are at least over nine machine direction yarns and highest under one machine direction yarn, that the yarn yarns of the lower transverse yarns within the weave repeat are at least below six and over at least two machine direction yarns run, and that between two machine direction yarns, which run over a cross-direction yarn, at least one other machine direction yarn under the same cross-direction thread, you always get on the top or paper side required for a good fiber support long cross-stitch yarn bridges, in conjunction with the open chain also has the required permeability for the required high drainage performance guaranteed.
  • the long yarn bridges are advantageous in terms of high transverse bending stability of the wire.
  • the lower or running side guarantees high stability with regard to diagonal distortion due to the double integration of the lower cross-direction yarns.
  • the applied tension in the machine direction causes the two binding machine direction threads to move toward one another at the binding point, thereby additionally enlarging the open areas of the screen.
  • the permeability increases and, on the other hand, the lower cross-direction thread is more strongly bent and protrudes further out of the lower or running side and can thus be "sanded off" to a greater extent in the paper machine
  • the number of cross-direction yarns is higher on the top or paper side than on the bottom or side of the run.There is no fixed assignment of individual machine direction yarns to either side of the machine
  • the two layers of fabric together can be made in different ways, for example in the form of the use of additional binding threads, which can be formed as cross-direction threads or machine direction threads
  • a further possibility of the connection is the so-called integral connection with the aid of the existing binding. own threads, also called structural threads, such as machine direction thread or cross-direction thread that can be designed both
  • FIG. 1 b is a plan view of a section of the upper or Verysei- te
  • Fig.l c is a plan view of a section of the lower or running side, without upper transverse direction yarn as a section between the fabric layers 1T and 1 B of FIG. 1 a.
  • FIG. 2a shows the course of the machine direction threads in a second embodiment of the wire along the section line B - B in Figure 2b and in Figure 2c, wherein the layer connection is realized by an exchange of the machine direction yarns.
  • Fig.2b is a plan view of a section of the top or paper side;
  • Figure 2c is a plan view of a section of the lower or running side, without upper transverse direction yarn as a section between the fabric layers 2T and 2B of FIG. 2a.
  • FIG 3a shows the course of the machine direction threads in a third embodiment of the wire along the section line C - C in Figure 3b and in Figure 3c, wherein the layer connection is realized by an exchange of the machine direction yarns.
  • 3b shows a plan view of a section of the top or paper side
  • 3c shows a plan view of a section of the lower or running side, without upper transverse direction yarn as a section between the fabric layers 3T and 3B according to FIG. 3a;
  • 4a shows the course of the machine direction threads in a fourth embodiment of the wire along the section line D - D in Figure 4b and in Figure 4c, wherein the layer connection is realized by an exchange of the machine direction yarns.
  • 4b is a plan view of a section of the top or paper side;
  • 4c is a plan view of a section of the lower or running side, without upper transverse direction of the cross section as a section between the fabric layers 4T and 4B of FIG. 4a.
  • the screen shown in FIGS. 1a, 1b, 1c in the form of a papermaking fabric realizes the fabric according to the invention with a ratio of the transverse direction yarns from upper side (121 to 130) to lower side (141 to 145) of 2: 1 and a connection of the two Fabric layers 1T and 2T by replacing two directly adjacent machine direction yarns 101 to 110 used as a functional pair.
  • the following machine direction yarns are to be considered as pairs, namely, 101, 102; 103, 104; 105, 106; 107,108 and 109 and 110. If the reference numbers have a superscript, that is, for example, 101 'instead of 101, this means that the following rapport is addressed.
  • the second exemplary embodiment according to FIGS. 2 a to 2 c relates to a papermaking wire according to the invention, as described above, wherein a modified arrangement of the points of application of the machine direction yarns 201 to 210 on the upper side has achieved a modified character of the paper side such that it only comes to low marks in the paper. Also in this embodiment, the ratio of the cross-direction yarns from top side 121 to 130 to bottom side 141 to 145 is 2: 1, and the connection of fabric layers 2T and 2B is made by exchanging two directly adjacent machine direction yarns 201 to 210 used as a functional pair.
  • the fabric according to the invention is with a ratio of the transverse direction yarns from upper side 321 to 335 to bottom side 341 to 350 of 3: 2 and a connection of the two fabric layers 3T and 3B by connection of the upper machine direction threads 301 to 305 realized on the lower transverse yarns 341 to 350.
  • the binding site is chosen so that it is located exactly between the binding of the lower machine direction threads 306 to 310 and thus protected against wear from the bottom.
  • the fourth exemplary embodiment according to FIGS. 4a, 4b, 4c shows the fabric according to the invention with a ratio of the transverse direction yarns from upper side 441 to 455 to bottom side 371 to 480 of 3: 2 and a connection of the two fabric layers 4T and 4B by a separate binder yarn 461 to 465, which is designed here as a cross-direction thread.
  • the diameter of the upper machine direction yarns may be equal to the diameter of the lower machine direction yarns; However, it is also possible to choose the diameter of the upper machine direction threads smaller than or equal to the diameter of the lower machine direction threads. Further, the diameter of the upper cross-direction thread may be smaller than that of the lower cross-direction thread. Insofar as machine direction threads are addressed in the application text, these represent the so-called warp threads of the fabric and the machine transverse direction threads are the so-called weft threads. If the bending stiffness of the screen is addressed in the transverse direction, the transverse direction in the screens is perpendicular to the same, for example perpendicularly along the line A - A in FIG. 1 b.
  • the machine direction can then be seen parallel to the line A - A in Figure 1 b.

Abstract

The fourdrinier, for a papermaking machine, is composed of two woven layers with warps and wefts where the warps are identical in both layers but the upper layer has more wefts than the lower layer in a ratio of the upper wefts (121-130) to the lower wefts (141-145) of 2:1. The two layers are held together by bonding filaments, using the warps in pairs (101-110) or additional wefts. The weaves are structured to leave spaces between the warps and weft for the water to escape from the pulp.

Description

Sieb, insbesondere Papiermaschinensieb Sieve, in particular paper machine screen
Die Erfindung betrifft ein Sieb, insbesondere Papiermaschinensieb, bestehend aus mindestens zwei Gewebelagen, wobei eine obere Gewebelage aus Maschinenrichtungsfäden und aus Querrichtungsfaden gebildet ist, wobei eine untere Gewebelage aus Maschinenrichtungsfäden und aus Quer- richtungsfäden gebildet ist, und wobei für die einzelnen Gewebelagen derart Fadenbrücken gebildet sind, dass diese über eine vorgebbare Wegstrek- ke innerhalb eines Bindungsrapportes keine Einbindung mit sonstigen Fäden aufweisen.The invention relates to a sieve, in particular a papermaking fabric, comprising at least two fabric layers, wherein an upper fabric layer is formed of machine direction yarns and of transverse direction yarn, wherein a lower fabric layer is formed of machine direction yarns and of transverse direction yarns, and wherein yarn bridges are formed for the individual fabric layers are that they have over a predeterminable Wegstrek- ke within a binding repeat no involvement with other threads.
Bei den einschlägigen Verfahren zur Papierherstellung kommt der Entwässerung der von oben auf das Sieb aufgebrachten Faserstoffsuspension durch Filtration eine wesentliche Bedeutung zu. Als Faserstoffsuspension dienen dabei Gemische aus geeigneten Fasern, Füllstoffen, chemischen Hilfsstoffen und Wasser, welches die überwiegende Menge des Gemisches bildet. Der angesprochene Filtrationsprozeß wird in der Papierindustrie auch mit Blattbildung bezeichnet und erfolgt im sogenannten Naß- oder Blattbildungsteil der Papiermaschine.In the relevant papermaking processes, dewatering of the pulp suspension applied from the top to the screen by filtration is of major importance. The pulp suspension used here are mixtures of suitable fibers, fillers, chemical auxiliaries and water, which forms the predominant amount of the mixture. The mentioned filtration process is also referred to in the paper industry with sheet formation and takes place in the so-called wet or sheet forming part of the paper machine.
Um ein möglichst gleichmäßiges Papierblatt herstellen zu können, ist es erforderlich, den Anteil an Wasser innerhalb der Faserstoffsuspension direkt vor der Blattbildung auf durchschnittlich 99 % zu erhöhen. Während des Prozesses der Blattbildung wird dieser Anteil durch Filtration wieder auf ca. 80 % reduziert. Die Papierfasern sowie die Füll- und Hilfsstoffe bleiben im sich ausbildenden Faservlies auf dem Papiermaschinensieb zurück.In order to be able to produce a sheet of paper that is as uniform as possible, it is necessary to direct the proportion of water within the pulp suspension to increase to an average of 99% before sheet formation. During the process of sheet formation, this fraction is reduced again by filtration to about 80%. The paper fibers as well as the fillers and auxiliaries remain in the forming non-woven fabric on the paper machine screen.
Während früher die Entwässerung hauptsächlich durch ein Papiermaschinensieb auf Langsiebmaschinen erfolgte, kommen heute immer häufiger Doppelsiebmaschinen, vorzugsweise sog. Gap- oder Spaltformer zum Einsatz. Diese zeichnen sich unter anderem dadurch aus, dass die Faserstoff- Suspension direkt in einen Spalt zwischen zwei Papiermaschinensiebe gespritzt und durch beide Siebe entwässert wird. Mit dieser Art der Papiermaschinen konnte der Filtrationsprozeß so beschleunigt werden, dass heute Produktionsgeschwindigkeiten von 2000 m/min und mehr möglich sind.While in the past the drainage was mainly by a paper machine screen on fourdrinier machines, nowadays more and more double screening machines, preferably so-called gap or gap formers are used. These are characterized, inter alia, by the fact that the pulp suspension is injected directly into a gap between two paper machine sieves and dewatered by both sieves. With this type of paper machines, the filtration process could be accelerated so that today production speeds of 2000 m / min and more are possible.
Ein besonderer Bereich innerhalb der Papierindustrie stellt die Herstellung von sog. Hygienepapieren dar, wie Taschentücher, Toilettenpapier, Handtücher od. dgl.. Die hier zum Einsatz kommenden Papiersorten zeichnen sich vor allem durch besonders geringe Flächengewichte aus, die je nach Verwendungszweck zwischen 10 und 20 g/m2 liegen. Grafische Papiersor- ten liegen im Vergleich dazu zwischen 42 und 120 g/m2.A special area within the paper industry is the production of so-called. Hygiene papers, such as handkerchiefs, toilet paper, towels od. Like. The paper grades used here are characterized by particularly low basis weights, depending on the intended use between 10 and 20 g / m 2 lie. In comparison, graphic paper grades are between 42 and 120 g / m 2 .
Um ein gleichmäßiges Blatt mit so niedrigem Flächengewicht zu bilden, benötigt man eine höhere Verdünnung der Faserstoffsuspension als bei anderen Papiersorten. Die Faserstoff konzentration sinkt auf etwa 0,3 bis 0,5 % ab. Um diese Papiersorten auch effektiv fertigen zu können, muß diese größere Wassermenge in kürzester Zeit, also bei den höchsten Produktionsgeschwindigkeiten, erfolgen. Gleichzeitig soll natürlich die Faserstoff retention möglichst hoch bleiben, also nur ein geringer Anteil der eingetragenen Fasern mit dem Wasser entfernt werden. Im Stand der Technik (EP 0 069 101 A1 , EP 0 1 16 945 A1 , EP 0 794 283 A1 sowie DE 100 30 650 A1) sind als Papiermaschinensiebe Verbundgewebe bekannt, die aus zwei mehr oder weniger eigenständigen einlagigen Sieben bestehen, die auf unterschiedliche Art und Weise miteinander verbunden weitestgehend eine offene Fläche beibehalten, so dass dergestalt die hohe erforderliche Entwässerungsleistung garantiert ist. Die genannten bekannten Lösungen zielen in den meisten Fällen darauf ab, eine gleichmäßige Papierseite in Form eines Zweischaft-Gewebes, auch Leinwandbindung genannt, mit den verschiedensten Laufseiten auf geeignete Art und Weise zu verbinden. Häufig geht jedoch zugunsten der hohen Entwässerungsleistung eine abnehmende Faserstoff retention einher, da nicht in ausreichendem Maße die für die Retention notwendigen langen Fadenbrücken der Querrichtungsfaden zur Verfügung stehen.To form a uniform sheet with such low basis weight requires a higher dilution of the pulp suspension than other types of paper. The pulp concentration drops to about 0.3 to 0.5%. In order to manufacture these types of paper effectively, this larger amount of water must be done in the shortest possible time, ie at the highest production speeds. At the same time of course, the fiber retention should remain as high as possible, so only a small proportion of the registered fibers are removed with the water. In the prior art (EP 0 069 101 A1, EP 0 1 16 945 A1, EP 0 794 283 A1 and DE 100 30 650 A1) are known as papermaking fabric composite fabric consisting of two more or less independent single-layer sieves, the different Connected with each other largely maintained an open area, so that the high required drainage performance is guaranteed. The mentioned known solutions aim in most cases to connect a uniform paper page in the form of a two-shaft fabric, also known as plain weave, with a variety of running pages in a suitable manner. Frequently, however, a decreasing fiber retention is associated in favor of the high dewatering performance, since the long thread bridges of the transverse yarns necessary for the retention are not available to a sufficient extent.
Die Verbindung zweier einlagiger Gewebe zum Papiermaschinensieb, bei denen längere Fadenbrücken durch Querrichtungsfaden gebildet werden, ist in der EP 0 889 160 A1 offenbart. Die Papierseite (Oberseite) wird dabei durch eine Vierschaft-Köperbindung und die Laufseite (Unterseite) durch eine Vierschaft-Leinwandbindung realisiert. Die Verbindung beider Lagen erfolgt durch eine Anbindung eines papierseitigen Maschinenrichtungsfadens an einen laufseitigen Querrichtungsfaden. Diese Art Gewebe zeichnet sich sowohl durch eine höhere Entwässerungsleistung als auch durch eine gute Faserunterstützung aufgrund der langen Fadenbrücken aus. Bei der bekannten Lösung kommt es zu einer heute nicht mehr akzeptablen Markierung, die durch die Art der Lagenverbindung hervorgerufen wird. Ferner ist das Verschleißpotential eingeschränkt, d.h. die Lauf- bzw. Maschinenseite, die überwiegend durch die Maschinenrichtungsfäden gebildet ist, wird direkt dem Verschleiß ausgesetzt und in der Folge kann es beim Einsatz zu Naht- oder Siebrissen kommen. Ferner ist die Biegesteifigkeit in Querrichtung eingeschränkt, und zwar bedingt durch die Vierschaft-Laufseite sowie einer schwer beherrschbaren automatischen Nahtung, die durch die parallel verlaufenden unteren Maschinenrichtungsfäden verursacht ist.The connection of two single-layer fabrics to the papermaking fabric, in which longer yarn bridges are formed by transverse yarn, is disclosed in EP 0 889 160 A1. The paper side (upper side) is realized by a four-shaft twill weave and the running side (underside) by a four-shaft plain weave. The connection between the two layers takes place by a connection of a paper-side machine direction yarn to a running-side transverse yarn. This type of fabric is characterized by both a higher dewatering performance as well as a good fiber support due to the long thread bridges. In the known solution, it comes to a no longer acceptable mark, which is caused by the nature of the layer connection. Furthermore, the wear potential is limited, ie the run or machine side, which is mainly formed by the machine direction threads is exposed directly to the wear and consequently it can in use Seam or sieve come. Further, the lateral bending stiffness is limited due to the four-shaft running side and a difficult to control automatic stitching caused by the parallel lower machine direction threads.
Ausgehend von diesem Stand der Technik liegt daher der Erfindung die Aufgabe zugrunde, unter Beibehalten der Vorteile der bekannten Sieblösungen diese dahingehend weiter zu verbessern, dass insbesondere im Bereich der Herstellung von Hygienepapieren eine sehr hohe Entwässerungs- leistung und Faserunterstützung gegeben ist. Gleichzeitig soll das Gewebe dünn aber trotzdem mechanisch stabil gegen Welligkeit und Verzug sein und dennoch gute Biegesteifigkeitswerte in Querrichtung aufweisen sowie die Möglichkeit einer vorteilhaften Nahtung zum Verbinden der Siebenden gewährleisten. Eine dahingehende Aufgabe löst ein Sieb, insbesondere Pa- piermaschinensieb, mit den Merkmalen des Patentanspruches 1 in seiner Gesamtheit.Based on this prior art, the invention is based on the object, while maintaining the advantages of the known sieve solutions to further improve this to the effect that in particular in the field of production of tissue papers a very high drainage performance and fiber support is given. At the same time, the fabric should be thin but nevertheless mechanically stable against waviness and warpage and still have good bending stiffness values in the transverse direction and ensure the possibility of an advantageous seaming for connecting the wire ends. This object is achieved by a screen, in particular paper machine screen, with the features of claim 1 in its entirety.
Dadurch, dass gemäß dem kennzeichnenden Teil des Patentanspruches 1 die Fadenbrücken der oberen Querrichtungsfaden innerhalb eines Bin- dungsrapportes mindestens über neun Maschinenrichtungsfäden und höchsten unter einem Maschinenrichtungsfaden verlaufen, dass die Fadenbrük- ken der unteren Querrichtungsfaden innerhalb des Bindungsrapportes mindestens unter sechs und über mindestens zwei Maschinenrichtungsfäden verlaufen, und dass zwischen zwei Maschinenrichtungsfäden, die über ei- nen Querrichtungsfaden verlaufen, mindestens ein anderer Maschinenrichtungsfaden unter dem gleichen Querrichtungsfaden verläuft, erhält man immer auf der Ober- oder Papierseite die für eine gute Faserunterstützung erforderlichen langen Fadenbrücken aus Querrichtungsfaden, die in Verbindung mit der offenen Kette auch die erforderliche Durchlässigkeit für die benötigte hohe Entwässerungsleistung gewährleistet. Zusätzlich zur besseren Faserunterstützung wirken die langen Fadenbrücken vorteilhaft im Hinblick auf eine hohe Biegestabilität in Querrichtung des Siebes. Die Unteroder Laufseite garantiert darüber hinaus durch die doppelte Einbindung der unteren Querrichtungsfaden eine hohe Stabilität bezüglich diagonalem Verzug. Dadurch, dass die unteren Querrichtungsfaden unter mindestens sechs Maschinenrichtungsfäden verlaufen, ist darüber hinaus eine hohe Verschleißfestigkeit in der Papiermaschine erreicht.By virtue of the fact that, according to the characterizing clause of claim 1, the yarn bridges of the upper transverse yarns within a binding repeat are at least over nine machine direction yarns and highest under one machine direction yarn, that the yarn yarns of the lower transverse yarns within the weave repeat are at least below six and over at least two machine direction yarns run, and that between two machine direction yarns, which run over a cross-direction yarn, at least one other machine direction yarn under the same cross-direction thread, you always get on the top or paper side required for a good fiber support long cross-stitch yarn bridges, in conjunction with the open chain also has the required permeability for the required high drainage performance guaranteed. In addition to better fiber support, the long yarn bridges are advantageous in terms of high transverse bending stability of the wire. In addition, the lower or running side guarantees high stability with regard to diagonal distortion due to the double integration of the lower cross-direction yarns. The fact that the lower transverse yarns run under at least six machine direction yarns, moreover, a high wear resistance is achieved in the paper machine.
Wird das Sieb vorzugsweise aufgebaut aus Kunststoff-Fäden während seiner Herstellung oder anschließend thermofixiert, kommt es dabei durch die aufgebrachte Spannung in Maschinenlaufrichtung dazu, dass sich die beiden bindenden Maschinenrichtungsfäden an der Bindestelle aufeinander zu bewegen und so die offenen Bereiche des Siebes zusätzlich vergrößern. Damit erhöht sich zum einen die Durchlässigkeit und zum anderen wird der untere Querrichtungsfaden stärker gekröpft und steht weiter aus der Unter- oder Laufseite heraus und kann so zu einem größeren Anteil in der Papiermaschine „abgeschliffen" werden. Bei einer bevorzugten Ausführungsform des erfindungsgemäßen Siebes wird die Ober- und die Unterseite aus der gleichen Anzahl an Maschinenrichtungsfäden gebildet, wobei es keine feste Zuordnung von einzelnen Maschinenrichtungsfäden zu einer der beiden Seiten geben muß. Die Anzahl an Querrichtungsfaden ist auf Ober- oder Papierseite höher als auf der Unter- oder Laufseite. Die Verbindung der beiden Gewebelagen miteinander kann auf unterschiedliche Art und Weise erfolgen, beispielsweise in Form des Einsatzes zusätzlicher Bindefäden, die als Querrichtungsfaden oder Maschinenrichtungsfäden ausgebildet sein können. Eine weitere Möglichkeit der Verbindung ist die sog. integrale Verbindung mit Hilfe der vorhandenen bin- dungseigenen Fäden, auch Strukturfäden genannt, wie Maschinenrichtungsfaden oder Querrichtungsfaden, die sowohl als Anbindung als auch als Austausch zweier benachbarter Fäden oder Fadensysteme ausgebildet sein können.If the screen is preferably constructed of plastic filaments during its production or subsequently heat-set, the applied tension in the machine direction causes the two binding machine direction threads to move toward one another at the binding point, thereby additionally enlarging the open areas of the screen. On the one hand, the permeability increases and, on the other hand, the lower cross-direction thread is more strongly bent and protrudes further out of the lower or running side and can thus be "sanded off" to a greater extent in the paper machine The number of cross-direction yarns is higher on the top or paper side than on the bottom or side of the run.There is no fixed assignment of individual machine direction yarns to either side of the machine The two layers of fabric together can be made in different ways, for example in the form of the use of additional binding threads, which can be formed as cross-direction threads or machine direction threads A further possibility of the connection is the so-called integral connection with the aid of the existing binding. own threads, also called structural threads, such as machine direction thread or cross-direction thread that can be designed both as a connection and as an exchange of two adjacent threads or thread systems.
Weitere vorteilhafte Ausführungsformen des erfindungsgemäßen Siebes sind Gegenstand der sonstigen Unteransprüche.Further advantageous embodiments of the screen according to the invention are the subject of the other dependent claims.
Im folgenden wird das erfindungsgemäße Sieb, insbesondere Papierma- schinensieb, anhand verschiedener Ausführungsbeispiele nach der Zeichnung näher erläutert. Dabei zeigen in prinzipieller und nicht maßstäblicher Darstellung dieIn the following, the sieve according to the invention, in particular paper machine screen, will be explained in more detail with reference to various embodiments according to the drawing. This show in principle and not to scale representation of the
Fig.1 a den Verlauf der Maschinenrichtungsfäden bei einem ersten Ausführungsbeispiel des Siebes entlang der Schnittlinie A - A in Fig.1 b sowie in Fig.l c, wobei die Lagenverbindung durch einen Austausch der Maschinenrichtungsfäden realisiert ist;1 a the course of the machine direction threads in a first embodiment of the wire along the section line A - A in Figure 1 b and in Fig.l c, wherein the ply connection is realized by an exchange of the machine direction yarns;
Fig.1 b eine Draufsicht auf einen Ausschnitt der Ober- oder Papiersei- te;FIG. 1 b is a plan view of a section of the upper or Papiersei- te;
Fig.l c eine Draufsicht auf einen Ausschnitt der Unter- oder Laufseite, und zwar ohne obere Querrichtungsfaden als Schnitt zwischen den Gewebelagen 1T und 1 B nach der Fig. 1 a;Fig.l c is a plan view of a section of the lower or running side, without upper transverse direction yarn as a section between the fabric layers 1T and 1 B of FIG. 1 a.
Fig.2a den Verlauf der Maschinenrichtungsfäden bei einem zweiten Ausführungsbeispiel des Siebes entlang der Schnittlinie B - B in Fig.2b sowie in Fig.2c, wobei die Lagenverbindung durch eine Austausch der Maschinenrichtungsfäden realisiert ist; Fig.2b eine Draufsicht auf einen Ausschnitt der Ober- oder Papierseite;2a shows the course of the machine direction threads in a second embodiment of the wire along the section line B - B in Figure 2b and in Figure 2c, wherein the layer connection is realized by an exchange of the machine direction yarns. Fig.2b is a plan view of a section of the top or paper side;
Fig.2c eine Draufsicht auf einen Ausschnitt der Unter- oder Laufseite, und zwar ohne obere Querrichtungsfaden als Schnitt zwischen den Gewebelagen 2T und 2B nach der Fig. 2a;Figure 2c is a plan view of a section of the lower or running side, without upper transverse direction yarn as a section between the fabric layers 2T and 2B of FIG. 2a.
Fig.3a den Verlauf der Maschinenrichtungsfäden bei einem dritten Ausführungsbeispiel des Siebes entlang der Schnittlinie C - C in Fig.3b sowie in Fig.3c, wobei die Lagenverbindung durch einen Austausch der Maschinenrichtungsfäden realisiert ist;3a shows the course of the machine direction threads in a third embodiment of the wire along the section line C - C in Figure 3b and in Figure 3c, wherein the layer connection is realized by an exchange of the machine direction yarns.
Fig. 3b eine Draufsicht auf einen Ausschnitt der Ober- oder Papierseite;3b shows a plan view of a section of the top or paper side;
Fig.3c eine Draufsicht auf einen Ausschnitt der Unter- oder Laufseite, und zwar ohne obere Querrichtungsfaden als Schnitt zwischen den Gewebelagen 3T und 3B nach der Fig. 3a;3c shows a plan view of a section of the lower or running side, without upper transverse direction yarn as a section between the fabric layers 3T and 3B according to FIG. 3a;
Fig.4a den Verlauf der Maschinenrichtungsfäden bei einem vierten Ausführungsbeispiel des Siebes entlang der Schnittlinie D - D in Fig.4b sowie in Fig.4c, wobei die Lagenverbindung durch einen Austausch der Maschinenrichtungsfäden realisiert ist; Fig.4b eine Draufsicht auf einen Ausschnitt der Ober- oder Papierseite; Fig.4c eine Draufsicht auf einen Ausschnitt der Unter- oder Laufseite, und zwar ohne obere Querrichtungsfaden als Schnitt zwischen den Gewebelagen 4T und 4B nach der Fig. 4a.4a shows the course of the machine direction threads in a fourth embodiment of the wire along the section line D - D in Figure 4b and in Figure 4c, wherein the layer connection is realized by an exchange of the machine direction yarns. 4b is a plan view of a section of the top or paper side; 4c is a plan view of a section of the lower or running side, without upper transverse direction of the cross section as a section between the fabric layers 4T and 4B of FIG. 4a.
Das in den Fig. 1a,1 b,1 c gezeigte Sieb in Form eines Papiermaschinensiebes realisiert das erfindungsgemäße Gewebe mit einem Verhältnis der Querrichtungsfaden von Oberseite (121 bis 130) zu Unterseite (141 bis 145) von 2 : 1 und einer Verbindung der beiden Gewebelagen 1T und 2T durch den Austausch zweier direkt benachbarter und als funktionales Paar verwendeter Maschinenrichtungsfäden 101 bis 110. Dabei sind die folgenden Maschinenrichtungsfäden als Paare zu betrachten, nämlich 101 , 102; 103, 104; 105, 106; 107,108 und 109 sowie 110. Sofern die Bezugszeichen hochgestellt einen Strich aufweisen, also beispielsweise 101 ' anstelle von 101 , bedeutet dies, dass der nachfolgende Rapport angesprochen ist.The screen shown in FIGS. 1a, 1b, 1c in the form of a papermaking fabric realizes the fabric according to the invention with a ratio of the transverse direction yarns from upper side (121 to 130) to lower side (141 to 145) of 2: 1 and a connection of the two Fabric layers 1T and 2T by replacing two directly adjacent machine direction yarns 101 to 110 used as a functional pair. The following machine direction yarns are to be considered as pairs, namely, 101, 102; 103, 104; 105, 106; 107,108 and 109 and 110. If the reference numbers have a superscript, that is, for example, 101 'instead of 101, this means that the following rapport is addressed.
Das zweite Ausführungsbeispiel nach den Fig. 2a bis 2c betrifft ein erfindungsgemäßes Papiermaschinensieb vergleichbar der Ausführung wie vorstehend beschrieben, wobei durch eine veränderte Anordnung der Anbln- destellen der Maschinenrichtungsfäden 201 bis 210 auf der Oberseite ein modifizierter Charakter der Papierseite dergestalt erreicht wurde, dass es nur zu geringen Markierungen im Papier kommt. Auch bei diesem Ausführungsbeispiel ist das Verhältnis der Querrichtungsfaden von Oberseite 121 bis 130 zu Unterseite 141 bis 145 von 2 : 1 und die Verbindung der Gewe- belagen 2T und 2B erfolgt durch den Austausch zweier direkt benachbarter und als funktionales Paar verwendeter Maschinenrichtungsfäden 201 bis 210. Dabei sind die folgenden Maschinenrichtungsfäden als Paare zu betrachten 201, 202; 203, 204; 205, 206; 207,208 und 209 sowie 210. Bei dem dritten Ausführungsbeispiel nach den Fig. 3a,3b,3c ist das erfindungsgemäße Gewebe mit einem Verhältnis der Querrichtungsfaden von Oberseite 321 bis 335 zu Unterseite 341 bis 350 von 3 : 2 und einer Verbindung der beiden Gewebelagen 3T und 3B durch Anbindung der oberen Maschinenrichtungsfäden 301 bis 305 an die unteren Querrichtungsfaden 341 bis 350 realisiert. Dabei ist die Bindestelle so gewählt, dass sie genau zwischen den Bindestelien der unteren Maschinenrichtungsfäden 306 bis 310 liegt und somit gegen Verschleiß von der Unterseite geschützt ist.The second exemplary embodiment according to FIGS. 2 a to 2 c relates to a papermaking wire according to the invention, as described above, wherein a modified arrangement of the points of application of the machine direction yarns 201 to 210 on the upper side has achieved a modified character of the paper side such that it only comes to low marks in the paper. Also in this embodiment, the ratio of the cross-direction yarns from top side 121 to 130 to bottom side 141 to 145 is 2: 1, and the connection of fabric layers 2T and 2B is made by exchanging two directly adjacent machine direction yarns 201 to 210 used as a functional pair. The following machine direction yarns are to be regarded as pairs 201, 202; 203, 204; 205, 206; 207,208 and 209 as well as 210. In the third exemplary embodiment according to FIGS. 3a, 3b, 3c, the fabric according to the invention is with a ratio of the transverse direction yarns from upper side 321 to 335 to bottom side 341 to 350 of 3: 2 and a connection of the two fabric layers 3T and 3B by connection of the upper machine direction threads 301 to 305 realized on the lower transverse yarns 341 to 350. The binding site is chosen so that it is located exactly between the binding of the lower machine direction threads 306 to 310 and thus protected against wear from the bottom.
Das vierte Ausführungsbeispiel nach den Fig.4a,4b,4c zeigt das erfindungsgemäße Gewebe mit einem Verhältnis der Querrichtungsfaden von Oberseite 441 bis 455 zu Unterseite 371 bis 480 von 3 : 2 und eine Verbindung der beiden Gewebelagen 4T und 4B durch einen separaten Bindefaden 461 bis 465, der hier als Querrichtungsfaden ausgebildet ist.The fourth exemplary embodiment according to FIGS. 4a, 4b, 4c shows the fabric according to the invention with a ratio of the transverse direction yarns from upper side 441 to 455 to bottom side 371 to 480 of 3: 2 and a connection of the two fabric layers 4T and 4B by a separate binder yarn 461 to 465, which is designed here as a cross-direction thread.
Der Durchmesser der oberen Maschinenrichtungsfäden kann gleich dem Durchmesser der unteren Maschinenrichtungsfäden sein; es besteht aber auch die Möglichkeit, den Durchmesser der oberen Maschinenrichtungsfäden kleiner oder gleich dem Durchmesser der unteren Maschinenrichtungs- fäden zu wählen. Ferner kann der Durchmesser der oberen Querrichtungsfaden kleiner sein als der der unteren Querrichtungsfaden. Sofern in dem Anmeldetext Maschinenrichtungsfäden angesprochen sind, stellen diese die sog. Kettfäden des Gewebes dar und die Maschinenquerrichtungsfäden sind die sog. Schußfäden. Sofern die Biegesteif igkeit des Siebes in der Querrich- tung angesprochen ist, verläuft die Querrichtung bei den Sieben senkrecht zu denselben, beispielsweise senkrecht längs der Linie A - A in Fig. 1 b. Die Maschinenlaufrichtung ist dann parallel zu der Linie A - A in Fig.1 b zu sehen. Ferner besteht die Möglichkeit, grundsätzlich für die Erstellung der Gewebe die Maschinenrichtungsfäden mit den Maschinenquerrichtungsfä- den zu tauschen, sofern einmal eine spezielle Webform dies notwendig machen sollte. The diameter of the upper machine direction yarns may be equal to the diameter of the lower machine direction yarns; However, it is also possible to choose the diameter of the upper machine direction threads smaller than or equal to the diameter of the lower machine direction threads. Further, the diameter of the upper cross-direction thread may be smaller than that of the lower cross-direction thread. Insofar as machine direction threads are addressed in the application text, these represent the so-called warp threads of the fabric and the machine transverse direction threads are the so-called weft threads. If the bending stiffness of the screen is addressed in the transverse direction, the transverse direction in the screens is perpendicular to the same, for example perpendicularly along the line A - A in FIG. 1 b. The machine direction can then be seen parallel to the line A - A in Figure 1 b. In addition, it is possible, in principle, for the production of the fabrics, to use the machine direction threads with the cross-machine direction. to exchange it, if a special webform should make this necessary.

Claims

P a t e n t a n s p r ü c h eP a n t a n s p r e c h e
1. Sieb, insbesondere Papiermaschinensieb, bestehend aus mindestens zwei Gewebelagen, wobei eine obere Gewebelage aus Maschinenrich- tungsfäden und aus Querrichtungsfaden gebildet ist, wobei eine untere Gewebelage aus Maschinenrichtungsfäden und aus Querrichtungsfaden gebildet ist, und wobei für die einzelnen Gewebelagen derart Fadenbrücken gebildet sind, dass diese über eine vorgebbare Wegstrecke innerhalb eines Bindungsrapportes keine Einbindung mit sonstigen Fäden aufweisen, dadurch gekennzeichnet, dass die Fadenbrücken der oberen Querrichtungsfaden innerhalb eines Bindungsrapportes mindestens über neun Maschinenrichtungsfäden und höchstens unter einem Maschinenrichtungsfaden verlaufen, dass die Fadenbrücken der unteren Querrichtungsfaden innerhalb des Bindungsrapportes mindestens unter sechs und über mindestens zwei Maschinenrichtungsfäden verlaufen, und dass zwischen zwei Maschinenrichtungsfäden, die über einen Querrichtungsfaden verlaufen, mindestens ein anderer Maschinenrichtungsfaden unter dem gleichen Querrichtungsfaden verläuft. 2. Sieb nach Anspruch 1 , dadurch gekennzeichnet, dass die Anzahl der Maschinenrichtungsfäden der oberen Gewebelage und der unteren Gewebelage gleich ist und die Anzahl der Querrichtungsfaden auf der Oberseite des Siebes größer ist als auf seiner Unterseite. 3. Sieb nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die beiden Gewebelagen durch gewebeeigene Maschinenrichtungsfäden oder zusätzliche Querrichtungsfaden als Bindefäden miteinander verbunden sind. 1. sieve, in particular a papermaking fabric, consisting of at least two fabric layers, wherein an upper fabric layer is formed by machine direction yarns and from cross-direction yarn, a lower fabric layer being formed by machine direction yarns and by cross-direction yarn, and wherein thread bridges are formed for the individual fabric layers, characterized in that the yarn bridges of the upper transverse yarn within a Bindungsrapportes run at least over nine machine direction yarns and at most under a machine direction yarn that the yarn bridges of the lower transverse yarn within the Bindungsrapportes at least below six and over at least two machine direction yarns, and that between two machine direction yarns, which extend over a cross-direction yarn, at least one other Ma The machine direction thread runs under the same cross-direction thread. 2. Screen according to claim 1, characterized in that the number of machine direction threads of the upper fabric layer and the lower fabric layer is the same and the number of cross-direction yarn on the upper side of the screen is greater than on its underside. 3. Screen according to claim 1 or 2, characterized in that the two fabric layers are connected by fabric-specific machine direction yarns or additional cross-direction yarn as binding threads together.
. Sieb nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Verbindung der beiden Gewebelagen durch Austausch zweier Maschinenrichtungsfäden im Inneren des Gesamtgewebes erfolgt., Screen according to one of claims 1 to 3, characterized in that the connection of the two fabric layers takes place by exchanging two machine direction threads in the interior of the entire fabric.
5. Sieb nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Verbindung der beiden Gewebelagen durch Einbindung eines oberen Maschinenrichtungsfadens an einen unteren Querrichtungsfaden erfolgt und dass sich die Anbindestelle des oberen Maschinenrichtungsfadens genau zwischen den Anbindestellen zweier unterer Maschinen- richtungsfäden auf dem gleichen Querrichtungsfaden befindet.5. Screen according to one of claims 1 to 3, characterized in that the connection of the two fabric layers takes place by incorporating an upper machine direction yarn to a lower transverse yarn and that the attachment point of the upper machine direction yarn exactly between the tethers of two lower machine direction yarns on the same Cross-direction thread is located.
6. Sieb nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Verbindung der beiden Gewebelagen durch einen zusätzlich in das Gewebe eingebrachten Querrichtungsfaden erfolgt, der innerhalb eines Bindungsrapportes im Inneren des Gewebes einen oberen und einen unteren Maschinenrichtungsfaden verbindet.6. Screen according to one of claims 1 to 3, characterized in that the connection of the two fabric layers is effected by an additionally introduced into the fabric cross-direction thread which connects within a binding repeat in the interior of the fabric an upper and a lower machine direction yarn.
7. Sieb nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass das Verhältnis der Anzahl gewebeeigener Querrichtungsfaden auf der Oberseite zu dem der Unterseite 2 : 1 oder 3 : 2 gewählt ist. 7. Screen according to one of claims 1 to 6, characterized in that the ratio of the number tissue own cross-direction yarn on the top to the bottom 2: 1 or 3: 2 is selected.
EP05701331A 2004-03-30 2005-02-03 Wire cloth, in particular paper making wire cloth Active EP1738020B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05701331T PL1738020T3 (en) 2004-03-30 2005-02-03 Wire cloth, in particular paper making wire cloth

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004016640A DE102004016640B3 (en) 2004-03-30 2004-03-30 Fourdrinier, especially for a papermaking machine to produce toilet paper, is of two bonded woven layers with an increased weft count in the upper layer
PCT/EP2005/001070 WO2005106115A1 (en) 2004-03-30 2005-02-03 Wire cloth, in particular paper making wire cloth

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EP1738020A1 true EP1738020A1 (en) 2007-01-03
EP1738020B1 EP1738020B1 (en) 2007-07-18

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US (1) US7585394B2 (en)
EP (1) EP1738020B1 (en)
JP (1) JP4874952B2 (en)
KR (1) KR101161336B1 (en)
CN (1) CN1930342B (en)
AT (1) ATE367478T1 (en)
BR (1) BRPI0509295B1 (en)
DE (2) DE102004016640B3 (en)
ES (1) ES2287895T3 (en)
MX (1) MXPA06011075A (en)
PL (1) PL1738020T3 (en)
WO (1) WO2005106115A1 (en)

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EP2230352B1 (en) 2009-03-20 2012-10-03 Heimbach GmbH & Co.KG Woven fabric band for circulation in a machine
DE102010017055A1 (en) * 2010-05-21 2011-11-24 Andritz Technology And Asset Management Gmbh forming wire
JP6192945B2 (en) * 2013-01-24 2017-09-06 イチカワ株式会社 Press felt for papermaking
EP2899311B1 (en) 2014-01-28 2016-01-13 Heimbach GmbH & Co. KG Paper maker fabric

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KR20070004004A (en) 2007-01-05
CN1930342A (en) 2007-03-14
DE102004016640B3 (en) 2005-08-11
BRPI0509295B1 (en) 2015-02-03
US7585394B2 (en) 2009-09-08
PL1738020T3 (en) 2007-11-30
JP4874952B2 (en) 2012-02-15
KR101161336B1 (en) 2012-07-06
MXPA06011075A (en) 2007-03-15
ATE367478T1 (en) 2007-08-15
WO2005106115A1 (en) 2005-11-10
CN1930342B (en) 2010-06-02
ES2287895T3 (en) 2007-12-16
DE502005001077D1 (en) 2007-08-30
JP2007535619A (en) 2007-12-06
EP1738020B1 (en) 2007-07-18
US20070125911A1 (en) 2007-06-07
BRPI0509295A (en) 2007-09-18

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