EP1000196A1 - Multi-layer screen for the wet area of a paper machine and product manufactured using the same - Google Patents

Multi-layer screen for the wet area of a paper machine and product manufactured using the same

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Publication number
EP1000196A1
EP1000196A1 EP98943749A EP98943749A EP1000196A1 EP 1000196 A1 EP1000196 A1 EP 1000196A1 EP 98943749 A EP98943749 A EP 98943749A EP 98943749 A EP98943749 A EP 98943749A EP 1000196 A1 EP1000196 A1 EP 1000196A1
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EP
European Patent Office
Prior art keywords
threads
layer sieve
sieve according
constriction
points
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
EP98943749A
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German (de)
French (fr)
Other versions
EP1000196B1 (en
Inventor
Hans-Jürgen Lamb
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.)
Essity Germany GmbH
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SCA Hygiene Products GmbH
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Publication date
Application filed by SCA Hygiene Products GmbH filed Critical SCA Hygiene Products GmbH
Publication of EP1000196A1 publication Critical patent/EP1000196A1/en
Application granted granted Critical
Publication of EP1000196B1 publication Critical patent/EP1000196B1/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
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/006—Making patterned 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

  • Multi-layer screen for the wet area of a paper machine and the product made with it
  • the invention relates to a multi-layer sieve for the wet area of a paper machine, in particular for tissue production, with at least two layers made from threads, preferably woven threads, which are connected to each other by additional threads intertwined with the layers and a product produced therewith.
  • silk or tissue paper with a network-like structure in which the normally flat, homogeneous, normally inflexible structure of the dried silk or tissue paper due to the differences in basis weight generated in the sheet formation in the macroscopic area in a flat, inhomogeneous, network-like structure is transferred, which reacts flexibly when subjected to external forces.
  • the creping process which is usually carried out in the manufacture of tissue paper makes the tissue paper more flexible compared to the stresses caused by external forces, but predominantly in the machine direction.
  • the higher flexibility in the machine direction that can be achieved with creping in the case of a homogeneous paper structure manifests itself in an increased working capacity with the result of greater flexibility in the machine direction.
  • the flexibility of the paper and thus also of a silk or tissue paper can be additionally improved, whereby this improvement is not limited to the machine direction, but can also be achieved in the cross machine direction .
  • the network-like structure is achieved by varying the basis weight, areas of high basis weight and areas of low basis weight in the macroscopic range being one another alternate.
  • the variation in the basis weight is achieved by varying the drainage capacity of the sieve.
  • the openness of the sieve can also be varied by combining different weaving patterns.
  • the base fabric of the structure-forming sieve can have one or more layers, but preferably two layers. As has already been mentioned in connection with US Pat. No. 5,219,004, it is already known to connect the layers to one another by means of additional threads.
  • the additional threads together with the threads forming the layers form narrowing points distributed over the width and length of the sieve, through which significantly less water can flow off than through the adjacent areas.
  • This solution is characterized in that the additional threads used for connecting the layers of the sieve are used to form the closed zones or essentially closed zones of the sieve, the essentially open zones being formed in the regions of the sieve, where the additional threads do not close the stitches in the base fabric.
  • a double function is achieved with the additional threads.
  • Such a sieve can be used to produce a significantly improved paper product, in particular silk or tissue paper.
  • the additional threads can form constriction z. B. run in the machine direction and appear at predetermined locations on the top of the screen or the location there and these as constriction points in
  • constriction points for the formation of longitudinal sections can also be strung together to some extent perpendicular to the machine direction and partially in the machine direction.
  • the longitudinal sections can also be aligned alternately in opposite directions.
  • the longitudinal sections can also be arranged in parallel within the same orientations in groups.
  • constriction points can be strung together to form zigzag or wavy courses.
  • constriction points can be arranged so that closed or at least partially open, but also continuous courses are formed.
  • the arrangement of the constriction points can also be such that discontinuous courses are available alone or together with continuous courses.
  • a paper product produced with such a sieve, in particular silk or tissue paper, has considerably improved properties, in particular with regard to the so-called feel or softness.
  • Figure 1 is a plan view of a multi-layer sieve according to the invention.
  • Figure la is a sectional view through the screen of Figure 1 along the section line a-a.
  • FIG. 1b shows a sectional view through the sieve according to FIG. 1 along the section line b-b;
  • 6 to 12 are schematic representations of further multi-layer sieves with different configurations of the layer arrangement of additional threads as connecting threads;
  • FIG. 13a shows a conventional flat, homogeneous tissue paper before and after applying a stretching force (arrows);
  • FIG. 13b shows a flat, inhomogeneous, network-like tissue paper according to the invention, also before and after applying a stretching force (arrows).
  • the double-layer sieve is designed as a fabric, with an upper fabric 10 and a lower fabric 11.
  • the machine direction of the screen is indicated by the arrow A.
  • the threads 12a of the upper fabric paper-touched side
  • the threads 12b of the upper fabric can be designed as warp threads, but also as weft threads, but preferably as warp threads. same for correspondingly vice versa for the threads 12b of the upper fabric. In the same way, this applies accordingly to the threads 13a and 13b of the lower fabric.
  • additional threads 14 run as connecting threads 14 in the same direction and parallel to the threads 12a in such a way that, as shown in FIG. 1b, the additional threads 14 run between the threads 13b and threads 13c of the lower fabric 11 and on the thread from FIG 1 visible places close stitches 15 by appearing there on the upper side of the upper fabric 10 and running above threads 12c of the upper fabric.
  • the additional threads 14 form constriction points 16 in the machine running direction. Lined up obliquely to the machine direction A, these constriction points 16 result in constriction regions 17 designed as longitudinal sections. Purely by way of example, two parallel constriction regions 17 and 18 are provided in each direction. Alternating such constriction areas are in z. B.
  • FIG. 2 shows a product that was produced with a sieve structure according to FIG. 1. The areas marked in dark form the aforementioned network-like structure. This creates a coherent zone of high basis weight. The same applies to the product according to FIGS. 3, 4 and 5.
  • FIGS. 3 shows a product that was produced with a sieve structure according to FIG. 1. The areas marked in dark form the aforementioned network-like structure. This creates a coherent zone of high basis weight. The same applies to the product according to FIGS. 3, 4 and 5.
  • the dark areas, which mean high weight, can also be those with low weight and which are light represented area parts, which mean low basis weight, correspondingly be those with high basis weight (see the example of FIGS. 2a, 3a). Then the brightly colored areas form the aforementioned network-like structure.
  • FIGS. 6 to 8 Further modifications of the sieve structure can be seen schematically in FIGS. 6 to 8.
  • the parts by area having a low basis weight form the aforementioned network-like structure.

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  • Filtering Materials (AREA)

Abstract

The invention relates to a multi-layer screen (10, 11) for the wet area of a paper machine and to a tissue paper produced using the same. The inventive screen consists of threads, preferably woven threads, forming at least two layers. These layers are joined to each other by additional threads (14) which are interlaced with the layers. Together with the threads which make up the layers, the additional threads (14) form constricted points (16), said constricted points being spread across the length and breadth of the screen. A significantly less quantity of water can pass through these points than through the areas adjacent thereto. Arranged in special sequences, the additional threads are a means of influencing the drainage of water through the screen at the constricted points for producing tissue paper with alternating areas of high and low GSM substance. The invention therefore provides a simple means of producing a tissue paper with a flexible, thin, non-homogeneous, net-like structure.

Description

Mehrlagiges Sieb für den Naßbereich einer Papiermaschine und damit hergestelltes Produkt Multi-layer screen for the wet area of a paper machine and the product made with it
Die Erfindung bezieht sich auf ein mehrlagiges Sieb für den Naßbereich einer Papiermaschine, insbesondere für die Tissue- Herstellung, mit zumindest zwei aus Fäden, vorzugsweise verwobenen Fäden hergestellten Lagen, die durch mit den Lagen verflochtene zusätzliche Fäden miteinander verbunden sind und ein damit hergestelltes Produkt.The invention relates to a multi-layer sieve for the wet area of a paper machine, in particular for tissue production, with at least two layers made from threads, preferably woven threads, which are connected to each other by additional threads intertwined with the layers and a product produced therewith.
Ein derartiges mehrlagiges Sieb ist aus der US-PS 5 219 004 bekannt .Such a multilayer sieve is known from US Pat. No. 5,219,004.
Bei der Herstellung von Papier und insbesondere Tissue-Papier ist es bekannt, im Naßbereich durch gezielte selektive Entwässerung durch das Sieb über bestimmte Bereiche durch differenzierte Ablagerung der Fasern abwechselnd ein hohes und ein niedriges Flächengewicht vorzusehen. An Stellen, wo das Sieb durchlässiger ist für das abfließende Wasser, d. h. in den sogenannten offenen Zonen, lagern sich mehr Fasern ab als in den sogenannten geschlossenen Zonen. Üblicherweise werden die geschlossenen und offenen Zonen dadurch gebildet, daß Schuß- und/oder Kettfäden des das Sieb bildenden Gewebes in unterschiedlicher Beabstandung zueinander angeordnet werden, wobei nach der Maschinenrichtung und nach der dazu senkrechten Querrichtung unterschieden wird. Dadurch ist es möglich, Papier, z. B. Seiden- oder auch Tissue-Papier, mit einer netzwerkähnlichen Struktur zu erzeugen, in dem die normalerweise flächige, homogene, gegen äußere Kräfte normalerweise unflexible Struktur des getrockneten Seiden- oder Tissue-Papiers durch die bei der Blattbildung im makroskopischen Bereich erzeugten Flächengewichtsunterschiede in eine flächige, inhomogene, netzwerkähnliche Struktur überführt wird, die bei Beanspruchung durch äußere Kräfte flexibel reagiert . Dabei ist Papier ebenso wie konventionelles Seiden- oder Tissue- Papier ein flächiges Gebilde, bei dem die einzelnen Fasern fest in dessen Gefüge verankert sind. Aufgrund der Einbindung der Fasern in das Gefüge ergibt sich bei makroskopisch homogenem Flächengewicht eine unflexible, steife Struktur. Im ungekreppten Zustand hat Seiden- oder Tissue-Papier sehr niedrige Dehnungswerte, im Bereich <= 6 %. Durch den üblicherweise bei der Herstellung von Tissue-Papier vorgenommenen Kreppvorgang wird das Tissue-Papier gegenüber der Beanspruchung durch äußere Kräfte flexibler, jedoch überwiegend in Maschinenrichtung. Die bei homogener Papierstruktur durch Kreppung erzielbare höhere Flexibilität in Maschinenrichtung äußert sich in einem erhöhten Arbeitsvermögen mit der Folge größerer Dehnbarkeit in Maschinenrichtung.In the production of paper and in particular tissue paper, it is known to alternately provide a high and a low basis weight in the wet area by selective selective dewatering through the screen over certain areas by differentiated deposition of the fibers. In places where the sieve is more permeable to the draining water, ie in the so-called open zones, more fibers are deposited than in the so-called closed zones. Usually, the closed and open zones are formed by arranging weft and / or warp threads of the fabric forming the screen at different distances from one another, a distinction being made according to the machine direction and the transverse direction perpendicular thereto. This makes it possible to use paper, e.g. B. silk or tissue paper, with a network-like structure in which the normally flat, homogeneous, normally inflexible structure of the dried silk or tissue paper due to the differences in basis weight generated in the sheet formation in the macroscopic area in a flat, inhomogeneous, network-like structure is transferred, which reacts flexibly when subjected to external forces. Like conventional silk or tissue paper, paper is a flat structure in which the individual fibers are firmly anchored in its structure. The integration of the fibers into the structure results in an inflexible, rigid structure with a macroscopically homogeneous basis weight. In the uncreped state, silk or tissue paper has very low elongation values, in the range <= 6%. The creping process which is usually carried out in the manufacture of tissue paper makes the tissue paper more flexible compared to the stresses caused by external forces, but predominantly in the machine direction. The higher flexibility in the machine direction that can be achieved with creping in the case of a homogeneous paper structure manifests itself in an increased working capacity with the result of greater flexibility in the machine direction.
Durch Überführung der flächigen, homogenen Struktur in netzwerkartige, flächige, inhomogene Struktur kann die Flexibilität des Papiers und damit auch eines Seiden- oder Tissue-Papiers zusätzlich verbessert werden, wobei diese Verbesserung nicht auf die Maschinenlaufrichtung beschränkt ist, sondern auch in Maschinenquerrichtung erzielt werden kann.By converting the flat, homogeneous structure into network-like, flat, inhomogeneous structure, the flexibility of the paper and thus also of a silk or tissue paper can be additionally improved, whereby this improvement is not limited to the machine direction, but can also be achieved in the cross machine direction .
Wie bereits ausgeführt wurde, wird die netzwerkähnliche Struktur durch Variation des Flächengewichtes erreicht, wobei Bereiche hohen Flächengewichtes und Bereiche niedrigen Flächengewichtes im makroskopischen Bereich einander abwechseln. Die Variation des Flächengewichtes wird erreicht durch Variation der Entwässerungsfähigkeit des Siebes. Dort, wo sich entsprechend den vorstehenden Ausführungen viele Fasern ablagern, spricht man von einer Zone hohen Flächengewichtes . Dort, wo sich wenige Fasern ablagern, spricht man von einer Zone niedrigen Flächengewichts.As has already been stated, the network-like structure is achieved by varying the basis weight, areas of high basis weight and areas of low basis weight in the macroscopic range being one another alternate. The variation in the basis weight is achieved by varying the drainage capacity of the sieve. Where, according to the above explanations, many fibers are deposited, one speaks of a zone of high basis weight. Where few fibers are deposited, one speaks of a zone of low basis weight.
Aufgrund örtlich verschiedener Entwässerungsleistung des Siebes gibt es zusätzlich parallel zur Sieboberfläche partielle Strömungen, wodurch die Fasern mehr oder weniger stark ausgerichtet werden, ähnlich wie bei der Erzeugung von echten Wasserzeichen.Due to the locally different drainage capacity of the screen, there are also partial flows parallel to the screen surface, which means that the fibers are more or less aligned, similar to the way real watermarks are created.
Es ist bekannt, Zonen unterschiedlicher Entwässerungsleistung durch Siebverengungen zu erreichen, indem Zonen im Sieb durch Kunststoff-Kleber bzw. Farbe etc. verschlossen werden (z. B. WO 93/00474) .It is known to achieve zones of different drainage performance by narrowing the screen by closing zones in the screen with plastic glue or paint, etc. (e.g. WO 93/00474).
Eine Variation der Offenheit des Siebes kann auch durch die Kombination verschiedener Webmuster erfolgen. Dabei kann das Basisgewebe des strukturbildenden Siebes ein- oder mehrlagig, bevorzugt aber zweilagig sein. Wie im Zusammenhang mit der US-PS 5 219 004 bereits erwähnt wurde, ist es bereits bekannt, die Lagen durch zusätzliche Fäden miteinander zu verbinden.The openness of the sieve can also be varied by combining different weaving patterns. The base fabric of the structure-forming sieve can have one or more layers, but preferably two layers. As has already been mentioned in connection with US Pat. No. 5,219,004, it is already known to connect the layers to one another by means of additional threads.
Es ist Aufgabe der Erfindung, ein mehrlagiges strukturgebendes Sieb der eingangs genannten Art zu schaffen, welches auf einfache Weise ermöglicht, zur Herstellung eines verbesserten Produktes die genannten modifizierten Entwässerungseigenschaften einzustellen.It is an object of the invention to provide a multi-layer structure-giving sieve of the type mentioned at the beginning, which enables the modified dewatering properties mentioned to be set in a simple manner in order to produce an improved product.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die zusätzlichen Fäden zusammen mit den die Lagen bildenden Fäden über die Breite und die Länge des Siebes verteilte Verengungsstellen bilden, durch die deutlich weniger Wasser abfließen kann als durch die benachbarten Bereiche. Diese Lösung kennzeichnet sich dadurch aus, daß die für das Verbinden der Lagen des Siebes verwendeten zusätzlichen Fäden genutzt werden, die geschlossenen Zonen bzw. im wesentlichen geschlossenen Zonen des Siebes zu bilden, wobei die im wesentlichen offenen Zonen in den Bereichen des Siebes gebildet sind, wo die zusätzlichen Fäden die Maschen im Basisgewebe nicht verschließen. Somit erzielt man mit den zusätzlichen Fäden eine Doppelfunktion. Mit einem solchen Sieb läßt sich ein wesentlich verbessertes Papierprodukt, insbesondere Seiden- oder Tissue-Papier herstellen.This object is achieved in that the additional threads together with the threads forming the layers form narrowing points distributed over the width and length of the sieve, through which significantly less water can flow off than through the adjacent areas. This solution is characterized in that the additional threads used for connecting the layers of the sieve are used to form the closed zones or essentially closed zones of the sieve, the essentially open zones being formed in the regions of the sieve, where the additional threads do not close the stitches in the base fabric. Thus, a double function is achieved with the additional threads. Such a sieve can be used to produce a significantly improved paper product, in particular silk or tissue paper.
In vorteilhafter Weiterbildung dieser Lösung können die zusätzlichen Fäden Verengungsstellen bildend z. B. in Maschinenrichtung verlaufen und an vorbestimmten Stellen an der Oberseite des Siebes bzw. der dort befindlichen Lage erscheinen und diese als Verengungsstellen inIn an advantageous further development of this solution, the additional threads can form constriction z. B. run in the machine direction and appear at predetermined locations on the top of the screen or the location there and these as constriction points in
Aneinandergruppierung oder Aneinanderreihung in verschiedenen Richtungen Verengungsbereiche bilden, die als Muster über die Fläche des Siebes erscheinen. Diese Stellen bilden im Papier bzw. im Tissue-Papier makroskopische Bereiche niedrigen Flächengewichtes, d. h. Strukturen mit einer niedrigeren Ablagerung von Fasern als in den benachbarten Bereichen, wodurch das Dehnungsverhalten in Längs- und Querrichtung, insbesondere aber in Querrichtung vorteilhafterweise beeinflußt wird. Das bedingt sich dadurch, daß mit bestimmter Ausrichtung die Flächenanteile geringen Flächengewichtes zu einer Schwächung im Vergleich mit einer homogenen Struktur führen, wodurch die angesprochene erhöhte Flexibilität der inhomogenen gegenüber der homogenen Struktur erreicht wird. Die auf vorgenannte Weise erzielbaren, nach einer vorgebbaren Struktur im Fasernetzwerk eines Papiers, insbesondere eines Seiden- oder Tissue-Papiers, anordenbaren Flächengewichtsunterschiede führen demnach zu einer, insbesondere für Tissue-Papiere wünschenswerten, Erhöhung des Arbeitsaufnahmevermögens in Längs- und Querrichtung. Wenn beispielsweise die Verengungsstellen zur Bildung von Längenabschnitten schräg zur Maschinenrichtung des Siebes aneinandergereiht sind, so wird quer zur Maschinenrichtung eine größere Flexibilität erreicht, und zwar in Ergänzung zur Flexibilität in Maschinenrichtung, die die Flexibilität durch Kreppen noch verbessert.Grouping or lining up in different directions form constriction areas that appear as a pattern over the surface of the sieve. These points form macroscopic areas of low basis weight in the paper or tissue paper, ie structures with a lower deposition of fibers than in the adjacent areas, as a result of which the elongation behavior in the longitudinal and transverse directions, but especially in the transverse direction, is advantageously influenced. This is due to the fact that, with a certain orientation, the area components of low basis weight lead to a weakening in comparison with a homogeneous structure, as a result of which the above-mentioned increased flexibility of the inhomogeneous compared to the homogeneous structure is achieved. The surface weight differences which can be achieved in the aforementioned manner and which can be arranged according to a predeterminable structure in the fiber network of a paper, in particular a silk or tissue paper, accordingly lead to an increase in the labor absorption capacity in the longitudinal and transverse directions, which is particularly desirable for tissue papers. If, for example, the constriction points for the formation of longitudinal sections are lined up at an angle to the machine direction of the screen, greater flexibility is achieved across the machine direction, in addition to the flexibility in the machine direction, which improves the flexibility by creping.
Im gleichen Sinne können die Verengungsstellen zur Bildung von Längenabschnitten auch teilweise senkrecht zur Maschinenrichtung und teilweise in Maschinenrichtung aneinandergereiht sein.In the same sense, the constriction points for the formation of longitudinal sections can also be strung together to some extent perpendicular to the machine direction and partially in the machine direction.
Hinsichtlich einer weiteren Ausgestaltungsmöglichkeit können die Längenabschnitte auch abwechselnd in entgegengesetzten Richtungen ausgerichtet sein. Die Längenabschnitte können aber auch innerhalb der gleich ausgerichteten Ausrichtungen gruppenweise parallel verlaufend angeordnet sein.With regard to a further design option, the longitudinal sections can also be aligned alternately in opposite directions. However, the longitudinal sections can also be arranged in parallel within the same orientations in groups.
Entsprechend einer weiteren Ausgestaltung können die Verengungsstellen zur Bildung von Zickzack- oder gewellten Verläufen aneinandergereiht sein.According to a further embodiment, the constriction points can be strung together to form zigzag or wavy courses.
Die Verengungsstellen können so angeordnet sein, daß sich geschlossene oder zumindest teilweise offene, aber auch kontinuierliche Verläufe bilden. Auch kann die Anordnung der Verengungsstellen so sein, daß diskontinuierliche Verläufe alleine oder zusammen mit kontinuierlichen Verläufen vorhanden sind.The constriction points can be arranged so that closed or at least partially open, but also continuous courses are formed. The arrangement of the constriction points can also be such that discontinuous courses are available alone or together with continuous courses.
Ein mit einem derartigen Sieb hergestelltes Papierprodukt, insbesondere Seiden- oder Tissue-Papier, hat erheblich verbesserte Eigenschaften insbesondere hinsichtlich der sogenannten Haptik bzw. Weichheit. Es ergibt sich ein positiver Einfluß auf Trocken- und Naßfestigkeit sowie eine positive Rückwirkung auf den Kreppvorgang, die Trocknung, das Pressen und die Entwässerung. Die Erfindung wird nachfolgend anhand der in den Zeichnungen rein schematisch dargestellten Ausführungsbeispiele näher erläutert. Es zeigen:A paper product produced with such a sieve, in particular silk or tissue paper, has considerably improved properties, in particular with regard to the so-called feel or softness. There is a positive influence on dry and wet strength as well as a positive effect on the crepe process, drying, pressing and dewatering. The invention is explained in more detail below with reference to the exemplary embodiments shown purely schematically in the drawings. Show it:
Fig. 1 eine Draufsicht auf ein erfindungsgemäßes mehrlagiges Sieb;Figure 1 is a plan view of a multi-layer sieve according to the invention.
Fig. la eine Schnittansicht durch das Sieb gemäß Fig. 1 entlang der Schnittlinie a-a;Figure la is a sectional view through the screen of Figure 1 along the section line a-a.
Fig. lb eine Schnittansicht durch das Sieb gemäß Fig. 1 entlang der Schnittlinie b-b;1b shows a sectional view through the sieve according to FIG. 1 along the section line b-b;
Fig. 2 bis 5 Draufsichten auf verschiedene Strukturmuster von Tissue-Papieren, hergestellt mit mehrlagigen Sieben ähnlich denen der Fig. 1;2 to 5 plan views of different structural patterns of tissue papers, produced with multi-layer sieves similar to those of FIG. 1;
Fig. 6 bis 12 schematische Darstellungen weiterer mehrlagiger Siebe mit unterschiedlicher Gestaltung der Lagenanordnung von zusätzlichen Fäden als Verbindungsfäden;6 to 12 are schematic representations of further multi-layer sieves with different configurations of the layer arrangement of additional threads as connecting threads;
Fig. 13a ein herkömmliches flächiges, homogenes Tissue- Papier vor und nach Aufbringen einer Streckkraft (Pfeile) ; und13a shows a conventional flat, homogeneous tissue paper before and after applying a stretching force (arrows); and
Fig. 13b ein erfindungsgemäßes flächiges, inhomogenes, netzwerkähnliches Tissue-Papier, ebenfalls vor und nach Aufbringen einer Streckkraft (Pfeile) .13b shows a flat, inhomogeneous, network-like tissue paper according to the invention, also before and after applying a stretching force (arrows).
Das doppellagige Sieb ist als Gewebe ausgebildet, und zwar mit einem Obergewebe 10 und einem Untergewebe 11. Die Maschinenrichtung des Siebs ist durch den Pfeil A gekennzeichnet. Hierbei können die Fäden 12a des Obergewebes (papierberührte Seite) in Abhängigkeit vom gewählten Webprozeß als Kettfäden, aber auch als Schußfäden ausgebildet sein, bevorzugt aber als Kettfäden. Gleiches gilt entsprechend umgekehrt für die Fäden 12b des Obergewebes . In gleicher Weise gilt dies entsprechend für die Fäden 13a bzw. 13b des Untergewebes .The double-layer sieve is designed as a fabric, with an upper fabric 10 and a lower fabric 11. The machine direction of the screen is indicated by the arrow A. Depending on the weaving process selected, the threads 12a of the upper fabric (paper-touched side) can be designed as warp threads, but also as weft threads, but preferably as warp threads. same for correspondingly vice versa for the threads 12b of the upper fabric. In the same way, this applies accordingly to the threads 13a and 13b of the lower fabric.
In diesem Ausführungsbeispiel verlaufen zusätzliche Fäden 14 als Verbindungsfäden 14 in der gleichen Richtung und parallel zu den Fäden 12a derart, daß entsprechend der Darstellung in Fig. lb die zusätzlichen Fäden 14 zwischen den Fäden 13b und Fäden 13c des Untergewebes 11 verlaufen und an den aus Fig. 1 ersichtlichen Stellen Maschen 15 schließen, indem sie dort an der Oberseite des Obergewebes 10 erscheinen und oberhalb von Fäden 12c des Obergewebes verlaufen. Dort bilden die zusätzlichen Fäden 14 Verengungsstellen 16 in Maschinenlaufrichtung. Schräg zur Maschinenrichtung A aneinandergereiht ergeben diese Verengungsstellen 16 als Längenabschnitte ausgebildete Verengungsbereiche 17. Rein beispielhaft sind jeweils in einer Richtung verlaufend zwei parallele Verengungsbereiche 17 und 18 vorgesehen. Abwechselnd sind solche Verengungsbereiche in z . B. zueinander senkrecht verlaufenden Richtungen über die Sieboberfläche vorgesehen, so daß ein Muster von Verengungsbereichen gebildet wird. Diese Verengungsbereiche bilden die bereits erwähnten Zonen niedrigen Flächengewichtes beim auf diesem Sieb hergestellten Seiden- oder Tissue- Papier, um diesem die gewünschte flächige, inhomogene, netzwerkähnliche Struktur hoher Flexibilität bei Beanspruchung zu geben. Eine derartige Struktur mit verschiedenen Gestaltungen ist den Figuren 2 bis 5 zu entnehmen. Fig. 2 zeigt ein Produkt, das mit einer Siebstruktur gemäß Fig. 1 erzeugt wurde. Dabei bilden die dunkel gekennzeichneten Flächenanteile die vorerwähnte netzwerkähnliche Struktur. Dadurch wird eine zusammenhängende Zone hohen Flächengewichtes gebildet. Das gleiche gilt für das Produkt gemäß Fig. 3, 4 und 5. Für die Produkte gemäß Fig. 2, 3, 4 und 5 können die dunkel dargestellten Flächenanteile, die hohes Flächengewicht bedeuten, auch solche mit geringem Flächengewicht sein und die hell dargestellten Flächenanteile, die geringes Flächengewicht bedeuten, entsprechend auch solche mit hohem Flächengewicht sein (siehe am Beispiel der Fig. 2a, 3a) . Dann bilden die hell dargestellten Flächenanteile die vorerwähnte netzwerkähnliche Struktur.In this exemplary embodiment, additional threads 14 run as connecting threads 14 in the same direction and parallel to the threads 12a in such a way that, as shown in FIG. 1b, the additional threads 14 run between the threads 13b and threads 13c of the lower fabric 11 and on the thread from FIG 1 visible places close stitches 15 by appearing there on the upper side of the upper fabric 10 and running above threads 12c of the upper fabric. There the additional threads 14 form constriction points 16 in the machine running direction. Lined up obliquely to the machine direction A, these constriction points 16 result in constriction regions 17 designed as longitudinal sections. Purely by way of example, two parallel constriction regions 17 and 18 are provided in each direction. Alternating such constriction areas are in z. B. mutually perpendicular directions are provided over the screen surface, so that a pattern of constriction areas is formed. These constriction areas form the previously mentioned low basis weight zones in the silk or tissue paper produced on this screen, in order to give it the desired flat, inhomogeneous, network-like structure of high flexibility under stress. Such a structure with different designs can be seen in FIGS. 2 to 5. FIG. 2 shows a product that was produced with a sieve structure according to FIG. 1. The areas marked in dark form the aforementioned network-like structure. This creates a coherent zone of high basis weight. The same applies to the product according to FIGS. 3, 4 and 5. For the products according to FIGS. 2, 3, 4 and 5, the dark areas, which mean high weight, can also be those with low weight and which are light represented area parts, which mean low basis weight, correspondingly be those with high basis weight (see the example of FIGS. 2a, 3a). Then the brightly colored areas form the aforementioned network-like structure.
Weitere Abwandlungen der Siebstruktur sind schematisch den Figuren 6 bis 8 zu entnehmen. Bei einem Produkt, das mit einer Siebstruktur gemäß Fig. 7 oder 8 hergestellt wurde, bilden die Flächenanteile geringen Flächengewichtes die vorerwähnte netzwerkähnliche Struktur.Further modifications of the sieve structure can be seen schematically in FIGS. 6 to 8. In the case of a product which has been produced with a sieve structure according to FIG. 7 or 8, the parts by area having a low basis weight form the aforementioned network-like structure.
Wie Fig. 13a beim herkömmlichen Tissue-Papier verdeutlicht, ist nahezu keine Längenänderung des Tissue-Papiers beim Aufbringen einer Streckkraft feststellbar, wohl aber bei dem Tissue-Papier gemäß Fig. 13b. As shown in FIG. 13a in the case of conventional tissue paper, almost no change in length of the tissue paper can be determined when a stretching force is applied, but it can be seen in the case of the tissue paper in accordance with FIG. 13b.

Claims

Patentansprüche claims
1. Mehrlagiges Sieb für den Naßbereich einer Papiermaschine, hergestellt aus Fäden, vorzugsweise gewebten Fäden mit zumindest zwei Lagen (10, 11), die durch mit den Lagen (10, 11) verflochtene zusätzliche Fäden (14) miteinander verbunden sind, dadurch g e k e n n z e i c h n e t , daß die zusätzlichen Fäden (14) zusammen mit den die Lagen (10, 11) bildenden Fäden (12a, 12b, 12c; 13a, 13b, 13c) über die Breite und die Länge des Siebes verteilte Verengungsstellen (16) bilden, durch die deutlich weniger Wasser abfließen kann als durch benachbarte Bereiche.1. Multi-layer sieve for the wet area of a paper machine, made from threads, preferably woven threads with at least two layers (10, 11), which are connected to each other by additional threads (14) intertwined with the layers (10, 11), characterized in that that the additional threads (14) together with the threads (12a, 12b, 12c; 13a, 13b, 13c) forming the layers (10, 11) form constriction points (16) distributed over the width and length of the sieve, which clearly show less water can drain off than through neighboring areas.
2. Mehrlagiges Sieb nach Anspruch 1, dadurch g e k e n n z e i c h n e t , daß die zusätzlichen Fäden (14) Verengungssteilen (16) bildend in Maschinenrichtung (A) verlaufen und an vorbestimmten Stellen an der Oberseite des Siebes (10) bzw. der dort befindlichen Lage erscheinen und diese als Verengungsstellen in Aneinandergruppierung oder Aneinanderreihung in verschiedenen Richtungen Verengungsbereiche (17, 18) bilden, die als Muster über die Fläche des Siebes erscheinen.2. Multi-layer sieve according to claim 1, characterized in that the additional threads (14) constricting parts (16) forming in the machine direction (A) and appear at predetermined locations on the top of the sieve (10) or the position there and this form constriction areas (17, 18) as constriction points in a grouping or in a row in different directions, which appear as a pattern over the surface of the sieve.
3. Mehrlagiges Sieb nach Anspruch 1 oder 2, dadurch g e k e n n z e i c h n e t , daß die Verengungsstellen (16) zur Bildung von Längenabschnitten (17, 18) schräg zur Maschinenrichtung (A) aneinandergereiht sind. 3. Multi-layer sieve according to claim 1 or 2, characterized in that the constriction points (16) to form longitudinal sections (17, 18) are lined up obliquely to the machine direction (A).
4. Mehrlagiges Sieb nach Anspruch 1 oder 2, dadurch g e k e n n z e i c h n e t , daß die Verengungsstellen (16) zur Bildung von Längenabschnitten (17, 18) teilweise senkrecht zur Maschinenrichtung (A) und teilweise in Maschinenrichtung aneinandergereiht sind.4. Multi-layer sieve according to claim 1 or 2, characterized in that the constriction points (16) to form longitudinal sections (17, 18) are strung together, partly perpendicular to the machine direction (A) and partly in the machine direction.
5. Mehrlagiges Sieb nach Anspruch 3 oder 4, dadurch g e k e n n z e i c h n e t , daß die Längenabschnitte (17, 18) abwechselnd in entgegengesetzten Richtungen ausgerichtet sind.5. Multi-layer sieve according to claim 3 or 4, characterized in that the longitudinal sections (17, 18) are alternately aligned in opposite directions.
6. Mehrlagiges Sieb nach Anspruch 3 oder 4, dadurch g e k e n n z e i c h n e t , daß die Längenabschnitte (17, 18) innerhalb der gleich ausgerichteten Ausrichtungen gruppenweise parallel verlaufend angeordnet sind.6. Multi-layer sieve according to claim 3 or 4, characterized in that the longitudinal sections (17, 18) are arranged in parallel within the same orientations in groups.
7. Mehrlagiges Sieb nach mindestens einem der Ansprüche 1 bis 3, dadurch g e k e n n z e i c h n e t , daß die Verengungsstellen (16) zur Bildung von Zickzack- oder gewellten Verläufen aneinandergereiht sind.7. Multi-layer sieve according to at least one of claims 1 to 3, characterized in that the constriction points (16) are lined up to form zigzag or wavy courses.
8. Mehrlagiges Sieb nach Anspruch 1 oder 2, dadurch g e k e n n z e i c h n e t , daß die Verengungssteilen (16) so angeordnet sind, daß sich geschlossene Verläufe bilden.8. Multi-layer sieve according to claim 1 or 2, characterized in that the constriction parts (16) are arranged in such a way that closed courses are formed.
9. Mehrlagiges Sieb nach Anspruch 1 oder 2, dadurch g e k e n n z e i c h n e t , daß die Verengungsstellen so angeordnet sind, daß sich teilweise offene Verläufe bilden. 9. Multi-layer sieve according to claim 1 or 2, characterized in that the constriction points are arranged so that partially open courses are formed.
10. Mehrlagiges Sieb nach Anspruch 1 oder 2, dadurch g e k e n n z e i c h n e t , daß die Verengungsstellen so angeordnet sind, daß sich kontinuierliche Verläufe bilden.10. Multi-layer sieve according to claim 1 or 2, characterized in that the constriction points are arranged in such a way that continuous courses are formed.
11. Mehrlagiges Sieb nach Anspruch 1 oder 2, dadurch g e k e n n z e i c h n e t , daß die Verengungsstellen so angeordnet sind, daß sich diskontinuierliche Verläufe bilden.11. Multi-layer sieve according to claim 1 or 2, characterized in that the constriction points are arranged in such a way that discontinuous courses are formed.
12. Mehrlagiges Sieb nach Anspruch 1 oder 2, dadurch g e k e n n z e i c h n e t , daß die Verengungsstellen so angeordnet sind, daß sich kontinuierliche und diskontinuierliche Verläufe bilden.12. Multi-layer sieve according to claim 1 or 2, characterized in that the constriction points are arranged in such a way that continuous and discontinuous courses are formed.
13. Mit einem mehrlagigen Sieb entsprechend mindestens einem der Ansprüche 1 bis 12 auf einer Papiermaschine hergestelltes Produkt .13. Product produced on a paper machine with a multi-layer sieve according to at least one of claims 1 to 12.
14. Produkt nach Anspruch 13 , dadurch g e k e n n z e i c h n e t , daß es sich dabei um ein Tissue-Papier handelt. 14. Product according to claim 13, characterized in that it is a tissue paper.
EP98943749A 1997-07-30 1998-07-21 Multi-layer screen for the wet area of a paper machine and product manufactured using the same Expired - Lifetime EP1000196B1 (en)

Applications Claiming Priority (3)

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DE19732879A DE19732879C2 (en) 1997-07-30 1997-07-30 Multi-layer screen for the wet area of a paper machine and the product made with it
DE19732879 1997-07-30
PCT/EP1998/004536 WO1999006629A1 (en) 1997-07-30 1998-07-21 Multi-layer screen for the wet area of a paper machine and product manufactured using the same

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WO2011124220A1 (en) 2010-04-04 2011-10-13 Tim Frey Newreporter system, arrangements and methods for video platforms

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WO2011124221A2 (en) 2010-04-05 2011-10-13 Tim Frey System, method and arrangements for securing resources

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DE19732879C2 (en) 1999-07-22
CZ2000296A3 (en) 2001-09-12
CN1272155A (en) 2000-11-01
PL187485B1 (en) 2004-07-30
AU730580B2 (en) 2001-03-08
BR9811566A (en) 2000-09-12
EP1000196B1 (en) 2001-11-21
HUP0004860A2 (en) 2001-06-28
ES2169546T3 (en) 2002-07-01
JP2001512192A (en) 2001-08-21
CA2297800A1 (en) 1999-02-11
PL338418A1 (en) 2000-11-06
DE19732879A1 (en) 1999-02-04
SK1122000A3 (en) 2000-08-14
ATE209270T1 (en) 2001-12-15
WO1999006629A1 (en) 1999-02-11
KR20010022426A (en) 2001-03-15
CO5040193A1 (en) 2001-05-29

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