EP0408849A2 - Forming fabric for the wet end of a paper machine - Google Patents

Forming fabric for the wet end of a paper machine Download PDF

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Publication number
EP0408849A2
EP0408849A2 EP90108910A EP90108910A EP0408849A2 EP 0408849 A2 EP0408849 A2 EP 0408849A2 EP 90108910 A EP90108910 A EP 90108910A EP 90108910 A EP90108910 A EP 90108910A EP 0408849 A2 EP0408849 A2 EP 0408849A2
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EP
European Patent Office
Prior art keywords
threads
support points
longitudinal
transverse
forming fabric
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.)
Withdrawn
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EP90108910A
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German (de)
French (fr)
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EP0408849A3 (en
Inventor
Karl Maria Dr. Fitzka
Fritz Vöhringer
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F Oberdorfer & Co KG Industriegewebe-Technik GmbH
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F Oberdorfer & Co KG Industriegewebe-Technik GmbH
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Application filed by F Oberdorfer & Co KG Industriegewebe-Technik GmbH filed Critical F Oberdorfer & Co KG Industriegewebe-Technik GmbH
Publication of EP0408849A2 publication Critical patent/EP0408849A2/en
Publication of EP0408849A3 publication Critical patent/EP0408849A3/en
Withdrawn legal-status Critical Current

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    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/903—Paper forming member, e.g. fourdrinier, sheet forming member

Definitions

  • the invention relates to a forming fabric for the wet end of a paper machine, consisting of at least two complete fabrics of any type of weave, which are woven together with longitudinal and / or transverse binding threads, the longitudinal threads of the fabrics forming longitudinal fiber support points and the transverse threads forming transverse fiber support points.
  • Multi-layer screens and composite fabrics in particular paper machine screens, in which the individual screen layers or fabric layers are connected to one another by a binding chain or a binding weft, have long been known (DE 24 55 185, DE 29 17 694).
  • Such screens are used to make a wide variety of papers, from kraft paper to cigarette and condenser papers. It goes without saying that kraft paper, that is to say packaging paper, has very different requirements with regard to tear and burst strength than, for example, cigarette papers. At the latter is less about tensile strength than about a defined air permeability, while again the most important thing is the printability of newsprint or graphic arts papers.
  • the relationship between the fiber support points FUP in the longitudinal direction of the fibers and the fiber support points FUP in the transverse direction of the thread is crucial.
  • the term "fiber support point” is understood to mean all those thread surface parts which stand out the most from the sheet formation plane of the forming wire and in this respect most likely come into contact with the fibers of the pulp.
  • the drawing figures 1 and 2 which show known forming fabrics of paper machine screens, in which, according to FIG. 1, the fiber support points have a balanced ratio in the longitudinal and transverse directions, i.e. are represented 1: 1 numerically, and according to FIG. 2 are clearly dominant in the longitudinal direction compared to the transverse direction, that is to say are represented in a larger number.
  • the object of the invention is therefore to bring about the adaptation of the surface structure of the paper to be produced to the respective application or the respective desired properties with the aid of binding means without changing the basic weave of the forming fabric in its character.
  • This object is achieved according to the invention in that at least some of the longitudinal threads and / or transverse threads of the forming fabric are assigned partner threads which run at least in one repeat parallel and thus are identical to the relevant longitudinal threads and / or transverse threads and the numerical ratio of the longitudinal fiber support points to the transverse ones Change the support points of the forming fabric.
  • Partner threads are threads that are associated with certain threads of the predetermined weave of the forming fabric, i.e., are at least partially integrated in the same way as the threads to which they are associated. These partner threads thus cause at least a part of the points at which the threads to which they are assigned to form a fiber support point virtually double this support point because they form a second point in addition to the first point, as a result of which the sheet formation surface of the threads increases accordingly .
  • the number of partner threads can be selected, it can be selected for forming fabrics that have a large difference between the existing fiber support points in the transverse and longitudinal directions of the fabric, so that the same number of fiber support points in the fabric in the two directions mentioned is installed.
  • the longitudinal fiber support points are identified by an x, the transverse ones by a circle. This marking makes it clear that the ratio of the number of longitudinal to the transverse fiber support points is balanced.
  • FIG. 2 also shows a known forming fabric in linen weave, in which, however, the longitudinal fiber support points, once again marked with x, clearly dominate over the transverse fiber support points.
  • At least some of the longitudinal threads and / or transverse threads of the forming fabric are associated with partner threads which run at least in one pattern parallel and thus are identical to the relevant longitudinal threads and / or transverse threads, whereby the numerical ratio of the longitudinal fiber support points to the transverse fiber support points of the forming fabric is changed.
  • the number of longitudinal fiber support points, identified by an x was originally greater than that of the transverse fiber support points, identified by a circle.
  • the partner threads 1 which run parallel to the transverse threads
  • every second of the forming fabric in linen weave having a partner thread 1 associated with it, which runs parallel in all adjacent repeats, that is to say the same weave the number of transverse fiber support points has been increased so that the original overweight is now balanced. Every second transverse thread of the forming fabric is therefore carried out twice in this embodiment. Nevertheless, the character of the respective original fabric is hardly changed by these partner threads. Its specific properties, such as stability, rigidity, wear behavior, drainage behavior u. Like., remain in Maintain unchanged or change due to the installation of the partner threads 1 only within tolerable limits.
  • a partner thread 2 is associated with every second transverse thread of the forming fabric, the partner threads running in the same pattern only in every second adjacent repeat and in the intermediate repeats are not involved.
  • the partner threads 2 are therefore bound 3: 1, i.e. they run over three longitudinal threads and then under one longitudinal thread, so they differ from the specified transverse threads to which they are assigned in that they are only crossed by a longitudinal thread in every second adjacent repeat , so are involved there.
  • a partner thread can be assigned not to every second thread but to each transverse thread or longitudinal thread.

Abstract

1.1. The invention concerns a forming fabric for the wet end of a paper machine, consisting of at least two complete woven fabrics of any desired type of weave which are held together by longitudinally and/or transversely orientated binding threads, the longitudinal threads of the fabrics forming longitudinally orientated fibre support points and the transverse threads forming transversely orientated fibre support points. <??>1.2. To adapt the surface structure of the paper to the particular intended use with the aid of fabric construction means without altering the character of the basic fabric construction, it is proposed that at least some of the longitudinal threads and/or transverse threads of the forming fabric be partnered by threads which in at least one repeat are parallel to and hence follow the same method of interlacing as the particular longitudinal and/or transverse threads and to alter the numerical ratio of the longitudinally orientated fibre support points to the transversely orientated fibre support points of the forming fabric. <IMAGE>

Description

Die Erfindung betrifft ein Formiergewebe für die Naß­partie einer Papiermaschine, bestehend aus mindestens zwei kompletten Geweben beliebiger Bindungsart, die mit längs- und/oder quergerichteten Bindefäden zusam­mengewebt sind, wobei die Längsfäden der Gewebe längsgerichtete Faserunterstützungspunkte und die Querfäden quergerichtete Faserunterstützungspunkte bilden.The invention relates to a forming fabric for the wet end of a paper machine, consisting of at least two complete fabrics of any type of weave, which are woven together with longitudinal and / or transverse binding threads, the longitudinal threads of the fabrics forming longitudinal fiber support points and the transverse threads forming transverse fiber support points.

Mehrlagige Siebe und Verbundgewebe, insbesondere Pa­piermaschinensiebe, bei denen die einzelnen Sieblagen bzw. Gewebelagen durch eine Bindekette oder einen Bin­deschuß miteinander verbunden sind, sind seit langem bekannt (DE 24 55 185, DE 29 17 694). Solche Siebe werden zur Herstellung sehr vielfältiger Papiersorten verwendet, angefangen von Kraftpapier bis zu Zigaret­ten- und Kondensatorpapieren. Es versteht sich, daß an Kraftpapiere, also Packpapiere, hinsichtlich Reiß- und Berstfestigkeit ganz andere Anforderungen gestellt werden als beispielsweise an Zigarettenpapiere. Bei letzteren kommt es weniger auf eine Reißfestigkeit als auf eine definierte Luftdurchlässigkeit an, während wiederum bei Zeitungspapieren oder Papieren des graphi­schen Gewerbes vor allem die Bedruckbarkeit eine we­sentliche Bedeutung hat. Diese unterschiedlichen Anfor­derungen werden entscheidend durch den auf dem Formier­gewebe einer Papiermaschine ablaufenden initialen Blattbildungsprozeß beeinflußt, bei dem sich die Fasern der Pulpe über dem Obergewebe des Formiergewebes vor­zugsweise gleichmäßig verteilen und ausrichten sowie kräuseln und verfilzen, während gleichzeitig die Pulpe entwässert wird, so daß ein initiales Faservlies ent­steht. Die Oberflächenstruktur des Formiergewebes ist daher für die Eigenschaftsausbildung des herzustellen­den Papiers von ganz wesentlicher Bedeutung.Multi-layer screens and composite fabrics, in particular paper machine screens, in which the individual screen layers or fabric layers are connected to one another by a binding chain or a binding weft, have long been known (DE 24 55 185, DE 29 17 694). Such screens are used to make a wide variety of papers, from kraft paper to cigarette and condenser papers. It goes without saying that kraft paper, that is to say packaging paper, has very different requirements with regard to tear and burst strength than, for example, cigarette papers. At the latter is less about tensile strength than about a defined air permeability, while again the most important thing is the printability of newsprint or graphic arts papers. These different requirements are decisively influenced by the initial sheet formation process which takes place on the forming fabric of a paper machine, in which the fibers of the pulp preferably distribute and align and ripple and matt over the upper fabric of the forming fabric, while at the same time the pulp is dewatered, so that an initial Nonwoven is created. The surface structure of the forming fabric is therefore very important for the development of the properties of the paper to be produced.

Bei der Anpassung dieser Oberflächenstruktur des For­miergewebes an die jeweiligen Erfordernisse kommt es entscheidend auf das Verhältnis der Faserunterstüt­zungspunkte FUP in Fadenlängsrichtung und der Faserun­terstützungspunkte FUP in Fadenquerrichtung an. Unter dem Begriff "Faserunterstützungspunkt" werden all die Fadenoberflächenteile verstanden, die sich am weite­sten aus der Blattbildungsebene des Formiersiebs her­ausheben und insofern am ehesten mit den Fasern der Pulpe in Berührung treten. Zur Verdeutlichung dieses Sachverhalts wird auf die Zeichnungsfiguren 1 und 2 verwiesen, die bekannte Formiergewebe von Papierma­schinensieben zeigen, bei denen gemäß Fig. 1 die Fa­serunterstützungspunkte in Längsrichtung und Querrich­tung ein ausgeglichenes Verhältnis aufweisen, also zahlenmäßig 1:1 vertreten sind, und gemäß Fig. 2 in Längsrichtung gegenüber der Querrichtung deutlich do­minant sind, also in einer größeren Anzahl vertreten sind.When adapting this surface structure of the forming fabric to the respective requirements, the relationship between the fiber support points FUP in the longitudinal direction of the fibers and the fiber support points FUP in the transverse direction of the thread is crucial. The term "fiber support point" is understood to mean all those thread surface parts which stand out the most from the sheet formation plane of the forming wire and in this respect most likely come into contact with the fibers of the pulp. To clarify this fact, reference is made to the drawing figures 1 and 2, which show known forming fabrics of paper machine screens, in which, according to FIG. 1, the fiber support points have a balanced ratio in the longitudinal and transverse directions, i.e. are represented 1: 1 numerically, and according to FIG. 2 are clearly dominant in the longitudinal direction compared to the transverse direction, that is to say are represented in a larger number.

Bisher konnte bei derartigen Formiergeweben eine Verän­derung des Einflusses der Faserunterstützungspunkte in einer bestimmten Richtung nur dadurch erreicht werden, daß beim Fixierprozeß der Fäden die entsprechenden Fa­serunterstützungspunkte in eine mehr oder weniger vor­gelagerte, d.h., der Blattbildungsebene zugewandte Ebene gebracht wurden, um jenen damit beim Blattbil­dungsprozeß die gewünschte Dominanz zu verschaffen. Dieses "Verschieben" der Faserunterstützungspunkte in eine vorgelagerte Ebene hat jedoch für das herzustel­lende Papier erhebliche Qualitätsnachteile zur Folge, die je nach Papierart so stark sein können, daß sich eine derartige Beeinflussung der Faserunter­stützungspunkten überhaupt verbietet. Die wesentlichen qualitativen Einbußen sind insbesondere in einer Ver­schlechterung der Oberflächenglätte und der Bedruckbar­keitseigenschaften des Papiers zu sehen.So far, with such forming fabrics, a change in the influence of the fiber support points in a certain direction could only be achieved in that the corresponding fiber support points were brought into a more or less upstream, i.e. facing the sheet formation plane, during the process of fixing the threads, so that the sheet formation process to create desired dominance. However, this "shifting" of the fiber support points into an upstream plane results in considerable quality disadvantages for the paper to be produced, which, depending on the type of paper, can be so severe that such an influencing of the fiber support points is impossible at all. The main qualitative losses can be seen, in particular, in a deterioration in the surface smoothness and the printability properties of the paper.

Die Aufgabe der Erfindung besteht deshalb darin, die Anpassung der Oberflächenstruktur des herzustellenden Papiers an den jeweiligen Verwendungsfall bzw. die je­weiligen gewünschten Eigenschaften mit Hilfe von bin­dungstechnischen Mitteln zu bewerkstelligen, ohne daß dabei die Grundbindung des Formiergewebes in ihrem Charakter geändert wird.The object of the invention is therefore to bring about the adaptation of the surface structure of the paper to be produced to the respective application or the respective desired properties with the aid of binding means without changing the basic weave of the forming fabric in its character.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß wenigstens einem Teil der Längsfäden und/oder Querfäden des Formiergewebes Partnerfäden beigeordnet werden, die wenigstens in einem Rapport parallel und damit gleich­bindig zu den betreffenden Längsfäden und/oder Querfä­den verlaufen und das Zahlenverhältnis der längsgerich­teten Faserunterstützungspunkte zu den quergerichteten Unterstützungspunkten des Formiergewebes verändern.This object is achieved according to the invention in that at least some of the longitudinal threads and / or transverse threads of the forming fabric are assigned partner threads which run at least in one repeat parallel and thus are identical to the relevant longitudinal threads and / or transverse threads and the numerical ratio of the longitudinal fiber support points to the transverse ones Change the support points of the forming fabric.

Partnerfäden sind also Fäden, die bestimmten Fäden der vorgegebenen Gewebebindung des Formiersiebes beigeord­net sind, d.h., wenigstens teilweise in derselben Weise eingebunden sind, wie die Fäden, denen sie beigeordnet sind. Diese Partnerfäden bewirken also wenigstens an ei­nem Teil der Stellen, an denen die Fäden, denen sie zu­geordnet sind, einen Faserunterstützungspunkt bilden, quasi eine Verdoppelung dieses Unterstützungspunktes, weil sie neben dem ersten Punkt einen zweiten Punkt bilden, wodurch sich die Blattbildungsoberfläche der Fä­den entsprechend vergrößert.Partner threads are threads that are associated with certain threads of the predetermined weave of the forming fabric, i.e., are at least partially integrated in the same way as the threads to which they are associated. These partner threads thus cause at least a part of the points at which the threads to which they are assigned to form a fiber support point virtually double this support point because they form a second point in addition to the first point, as a result of which the sheet formation surface of the threads increases accordingly .

Da die Anzahl der Partnerfäden wählbar ist, läßt sie sich bei Formiergeweben, die von Hause aus zwischen den vorhandenen Faserunterstützungspunkten in Quer­richtung und Längsrichtung des Gewebes einen großen Unterschied aufweisen, so wählen, daß in den beiden genannten Richtungen die gleiche Anzahl von Faserun­terstützungspunkten in das Gewebe eingebaut wird.Since the number of partner threads can be selected, it can be selected for forming fabrics that have a large difference between the existing fiber support points in the transverse and longitudinal directions of the fabric, so that the same number of fiber support points in the fabric in the two directions mentioned is installed.

Ebenso ist die Möglichkeit gegeben, die Anzahl der Partnerfäden so zu wählen, daß die Anzahl der querge­richteten Faserunterstützungspunkte größer ist als die Anzahl der längsgerichteten Faserunterstützungspunkte. Diese Auswahl richtet sich nach der jeweils gewünsch­ten Oberflächenbeschaffenheit des herzustellenden Pa­pieres.There is also the possibility of choosing the number of partner threads so that the number of transverse fiber support points is greater than the number of longitudinal fiber support points. This selection depends on the desired surface texture of the paper to be manufactured.

Dabei hat es sich als besonders vorteilhaft erwiesen, für die Durchmesser der Partnerfäden 1 (Fig. 3) die­selben Durchmesser zu wählen, die die Fäden aufweisen, denen sie zugeordnet sind.It has proven to be particularly advantageous to choose the same diameters for the diameters of the partner threads 1 (FIG. 3) that the threads have to which they are assigned.

Auf diese Weise besteht die Möglichkeit, bei Beibehal­tung spezifischer Eigenschaften der herzustellenden Pa­piere, wie Stabilität, Steifigkeit, Abnützungsverhalten, andere Eigenschaften wie Bedruckbarkeit, durch eine geplante Änderung der Oberflächenstruktur die Sieb­konstruktion ganz speziellen Forderungen anzupassen, also beispielsweise eine bestimmte Faserkräuselung bei der initialen Blattbildung zu erreichen, ohne auf andere vorteilhafte Eigenschaften einer bewährten Siebkonstruktion verzichten zu müssen.In this way, it is possible, while maintaining specific properties of the papers to be produced, such as stability, rigidity, wear behavior, other properties such as printability, to adapt the screen construction to very special requirements by a planned change in the surface structure, for example to achieve a certain fiber crimp during the initial sheet formation, without having to forego other advantageous properties of a proven screen construction.

Nun ist es zwar bei sogenannten doppellagigen Papier­maschinensieben bekannt, auf der Formierseite Floater­fäden zu verwenden (EP 85363), die jedoch ihrer Bin­dung nach mit den Partnerfäden der erfindungsgemäßen Art nicht vergleichbar sind, da sie in keinem Rapport mit einem benachbarten Faden gleichbindig verlaufen. Somit wird durch das Einweben von Floaterfäden der Charakter der vorgegebenen Siebbindung völlig verän­dert, während er beim Einweben von sogenannten Part­nerfäden erhalten bleibt. Die Floaterfäden haben des­halb auch eine andere Aufgabe. So sollen sie u.a. da­zu dienen, das Faserrückhaltevermögen (Retention) zu verbessern, indem die Querfadenabstände, d.h., die Maschenweiten, durch sie halbiert werden. Diese Tei­lung der Maschenweiten ist aber nur möglich, wenn die Floaterfäden, wie oben erwähnt, keinen gleichbindigen Verlauf aufweisen.Now it is known in so-called double-layer paper machine screens to use floater threads on the forming side (EP 85363), but their binding is not comparable to that of the partner threads of the type according to the invention, since they do not run in the same pattern with an adjacent thread. Thus, the weaving of floater threads completely changes the character of the specified screen weave, while it is retained when weaving in so-called partner threads. The floater threads therefore have a different task. For example, serve to improve the retention of fibers by halving the cross thread spacings, i.e. the mesh sizes. However, this division of the mesh sizes is only possible if the floater threads, as mentioned above, do not have an identical weave.

Die Erfindung wird nachfolgend anhand von in der Zeichnung dargestellten Ausführungsbeispielen näher erläutert.The invention is explained in more detail below with reference to exemplary embodiments shown in the drawing.

In der Zeichnung zeigen:

  • Fig. 1 die Draufsicht eines bekannten Formiergewebes für eine Papiermaschine gemäß der beanspruchten Gattung mit gleicher Anzahl von längsgerichte­ten Faserunterstützungspunkten und quergerich­teten Faserunterstützungspunkten,
  • Fig. 2 die Draufsicht und Längsschnittansicht eines bekannten Formiergewebes einer Papiermaschine gemäß der beanspruchten Gattung mit deutlicher Dominanz der längsgerichteten Faserunterstüt­zungspunkte,
  • Fig. 3 eine Draufsicht und Längsschnittansicht eines erfindungsgemäßen Formiergewebes, bei dem die Dominanz der längsgerichteten Faserunterstüt­zungspunkte im ursprünglichen Gewebe durch quergerichtete Partnerfäden 1 ausgeglichen ist, und
  • Fig. 4 die Draufsicht einer anderen Ausführungsform des erfindungsgemäßen Formiergewebes, bei dem durch Einweben von Partnerfäden 2 das ausgegli­chene Verhältnis von längsgerichteten zu querge­richteten Faserunterstützungspunkten im ur­sprünglichen Gewebe so verändert ist, daß die Anzahl der quergerichteten Faserunterstützungs­punkte größer ist.
The drawing shows:
  • 1 is a plan view of a known forming fabric for a paper machine according to the type claimed with the same number of longitudinal fiber support points and transverse fiber support points,
  • 2 shows the top view and longitudinal sectional view of a known forming fabric of a paper machine according to the claimed type with a clear dominance of the longitudinal fiber support points,
  • 3 shows a top view and a longitudinal sectional view of a forming fabric according to the invention, in which the dominance of the longitudinal fiber support points in the original fabric is balanced by transverse partner threads 1, and
  • Fig. 4 is a plan view of another embodiment of the forming fabric according to the invention, in which the balanced ratio of longitudinal to transverse fiber support points in the original fabric is changed by weaving in partner threads 2 so that the number of transverse fiber support points is greater.

Bei dem bekannten in Fig. 1 dargestellten Formiergewebe sind die längsgerichteten Faserunterstützungspunkte durch ein x gekennzeichnet, die quergerichteten durch einen Kreis. Durch diese Markierung wird deutlich, daß das Verhältnis der Anzahl der längsgerichteten zu den quergerichteten Faserunterstützungspunkten ausgeglichen ist.In the known forming fabric shown in Fig. 1, the longitudinal fiber support points are identified by an x, the transverse ones by a circle. This marking makes it clear that the ratio of the number of longitudinal to the transverse fiber support points is balanced.

Auch Fig. 2 zeigt ein bekanntes Formiergewebe in Leinen­bindung, bei dem jedoch die wiederum mit x gekennzeich­neten längsgerichteten Faserunterstützungspunkte gegen­über den quergerichteten Faserunterstützungspunkten deutlich dominieren.FIG. 2 also shows a known forming fabric in linen weave, in which, however, the longitudinal fiber support points, once again marked with x, clearly dominate over the transverse fiber support points.

Um bei diesen bekannten Formiergeweben den Blattbil­dungsprozeß im Hinblick auf die Verteilung, Ausrich­tung, Kräuselung und Verfilzung der Fasern im initia­len Faservlies, das sich auf dem Formiergewebe bildet, so zu beeinflussen, daß gewünschte Oberflächeneigen­schaften der herzustellenden Papiere,wie beispielswei­se Glätte und Bedruckbarkeit, erhalten werden, werden wenigstens einem Teil der Längsfäden und/oder Querfä­den des Formiergewebes Partnerfäden beigeordnet, die wenigstens in einem Rapport parallel und damit gleich­bindig zu den betreffenden Längsfäden und/oder Querfä­den verlaufen, wodurch das Zahlenverhältnis der längs­gerichteten Faserunterstützungspunkte zu den querge­richteten Faserunterstützungspunkten des Formiergewe­bes verändert wird.In order to influence the sheet formation process in these known forming fabrics with regard to the distribution, alignment, crimping and matting of the fibers in the initial nonwoven fabric that forms on the forming fabric, in such a way that desired surface properties of the papers to be produced, such as smoothness and printability, are obtained , At least some of the longitudinal threads and / or transverse threads of the forming fabric are associated with partner threads which run at least in one pattern parallel and thus are identical to the relevant longitudinal threads and / or transverse threads, whereby the numerical ratio of the longitudinal fiber support points to the transverse fiber support points of the forming fabric is changed.

So ist bei dem in Fig. 3 gezeigten Formiergewebeaufbau ursprünglich die Anzahl der längsgerichteten Faserunter­stützungspunkte, gekennzeichnet durch ein x, größer ge­wesen als die der quergerichteten Faserunterstützungs­punkte, gekennzeichnet durch einen Kreis. Durch Einbau der Partnerfäden 1, die parallel zu den quergerichteten Fäden verlaufen, wobei jedem zweiten des in Leinenbin­dung vorliegenden Formiergewebes ein Partnerfaden 1 beigeordnet ist, der in allen nebeneinanderliegenden Rapporten parallel, also gleichbindig verläuft, ist die Anzahl der quergerichteten Faserunterstützungs­punkte so vergrößert worden, daß das ursprüngliche Übergewicht nunmehr ausgeglichen ist. Jeder zweite Querfaden des Formiergewebes ist also bei dieser Aus­führungsform doppelt ausgeführt. Trotzdem wird der Charakter des jeweiligen ursprünglichen Gewebes durch diese Partnerfäden kaum verändert. Seine spezifischen Eigenschaften, wie Stabilität, Steifigkeit, Abnützungs­verhalten, Entwässerungsverhalten u. dgl., bleiben im wesentlichen unverändert erhalten bzw. ändern sich durch den Einbau der Partnerfäden 1 nur in tolerier­baren Grenzen.Thus, in the formation fabric construction shown in FIG. 3, the number of longitudinal fiber support points, identified by an x, was originally greater than that of the transverse fiber support points, identified by a circle. By incorporating the partner threads 1, which run parallel to the transverse threads, with every second of the forming fabric in linen weave having a partner thread 1 associated with it, which runs parallel in all adjacent repeats, that is to say the same weave, the number of transverse fiber support points has been increased so that the original overweight is now balanced. Every second transverse thread of the forming fabric is therefore carried out twice in this embodiment. Nevertheless, the character of the respective original fabric is hardly changed by these partner threads. Its specific properties, such as stability, rigidity, wear behavior, drainage behavior u. Like., remain in Maintain unchanged or change due to the installation of the partner threads 1 only within tolerable limits.

Nach der in Fig. 4 dargestellten erfindungsgemäßen Ausführungsform des Formiergewebes, das die in Fig. 1 dargestellte bekannte Ausführungsform weiterbildet, ist jedem zweiten Querfaden des Formiergewebes ein Partnerfaden 2 beigeordnet, wobei die Partnerfäden nur in jedem zweiten nebeneinanderliegenden Rapport gleichbindig verlaufen und in die dazwischenliegenden Rapporte nicht eingebunden sind. Dies bedeutet, daß die ursprünglich vorhandene gleiche Anzahl von längs­gerichteten und quergerichteten Faserunterstützungs­punkten so verändert wurde, daß nunmehr eine Dominanz der quergerichteten Faserunterstützungspunkte, gekenn­zeichnet durch einen Punkt, bestehen. Die Partnerfäden 2 sind demnach 3 : 1 gebunden, d.h., sie laufen über drei Längsfäden und anschließend unter einen Längsfaden, unterscheiden sich also insoweit von den vorgegebenen Querfäden, denen sie beigeordnet sind, als sie nur in jedem zweiten nebeneinanderliegenden Rapport von einem Längsfaden überquert werden, dort also eingebunden sind.According to the embodiment of the forming fabric according to the invention shown in FIG. 4, which further develops the known embodiment shown in FIG. 1, a partner thread 2 is associated with every second transverse thread of the forming fabric, the partner threads running in the same pattern only in every second adjacent repeat and in the intermediate repeats are not involved. This means that the originally existing equal number of longitudinal and transverse fiber support points was changed so that there is now a dominance of the transverse fiber support points, characterized by a point. The partner threads 2 are therefore bound 3: 1, i.e. they run over three longitudinal threads and then under one longitudinal thread, so they differ from the specified transverse threads to which they are assigned in that they are only crossed by a longitudinal thread in every second adjacent repeat , so are involved there.

Damit ist das Bindungsprinzip der Partnerfäden 1 und 2, die selbstverständlich auch in Längsrichtung eingewebt sein können, eindeutig definiert.The binding principle of partner threads 1 and 2, which can of course also be woven in the longitudinal direction, is thus clearly defined.

Selbstverständlich läßt sich auch in Abweichung von den Ausführungsformen der Formiergewebe nach den Fig. 3 und 4 nicht jedem zweiten, sondern jedem Querfaden bzw. Längsfaden ein Partnerfaden zuordnen.Of course, in deviation from the embodiments of the forming fabric according to FIGS. 3 and 4, a partner thread can be assigned not to every second thread but to each transverse thread or longitudinal thread.

Claims (5)

1. Formiergewebe für die Naßpartie einer Papiermaschi­ne, bestehend aus mindestens zwei kompletten Geweben beliebiger Bindungsart, die mit längs- und/oder querge­richteten Bindefäden zusammengewebt sind, wobei die Längsfäden der Gewebe längsgerichtete Faserunterstüt­zungspunkte und die Querfäden quergerichtete Faserun­terstützungspunkte bilden, dadurch gekenn­zeichnet, daß wenigstens einem Teil der Längs­fäden und/oder Querfäden des Formiergewebes Partnerfä­den beigeordnet sind, die wenigstens in einem Rapport parallel und damit gleichbindig zu den betreffenden Längsfäden und/oder Querfäden verlaufen und das Zah­lenverhältnis der längsgerichteten Faserunterstützungs­punkte zu den quergerichteten Faserunterstützungspunk­ten des Formiergewebes verändern.1. Forming fabric for the wet end of a paper machine, consisting of at least two complete fabrics of any type of weave, which are woven together with longitudinal and / or transverse binding threads, the longitudinal threads of the fabrics forming longitudinal fiber support points and the transverse threads forming transverse fiber support points, characterized in that at least one Part of the longitudinal threads and / or transverse threads of the forming fabric are associated with partner threads which run at least in one repeat in parallel and thus are identical to the relevant longitudinal threads and / or transverse threads and change the numerical ratio of the longitudinal fiber support points to the transverse fiber support points of the forming fabric. 2. Formiergewebe nach Anspruch 1, dadurch ge­kennzeichnet, daß die Anzahl der Partner­fäden so gewählt ist, daß die Anzahl der längsgerich­teten Faserunterstützungspunkte gleich der Anzahl der quergerichteten Faserunterstützungspunkte ist.2. Forming fabric according to claim 1, characterized in that the number of partner threads is chosen so that the number of longitudinal fiber support points is equal to the number of transverse fiber support points. 3. Formiergewebe nach Anspruch 1, dadurch ge­kennzeichnet, daß die Anzahl der Partner­fäden so gewählt ist, daß die Anzahl der quergerichte­ten Faserunterstützungspunkte größer ist als die Anzahl der längsgerichteten Faserunterstützungspunkte.3. forming fabric according to claim 1, characterized in that the number of partner threads is chosen so that the number of transverse fiber support points is greater than the number of longitudinal fiber support points. 4. Formiergewebe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß bei einer Leinenbindung des Formiergewebes jedem zweiten Querfa­den ein Partnerfaden (1) zugeordnet ist, der mit dem Querfaden in Berührung steht und den gleichen Durchmes­ser aufweist wie dieser.4. forming fabric according to one of claims 1 to 3, characterized in that with a linen weave of the forming fabric every second cross thread is assigned a partner thread (1) which is in contact with the cross thread and has the same diameter as this. 5. Formiergewebe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß bei einer Leinenbindung des Formiergewebes jedem zweiten Querfa­den dieses Gewebes ein Partnerfaden (2) beigeordnet ist, der mit dem Querfaden in Berührung steht und einen ge­ringeren Durchmesser aufweist wie dieser, so daß die Partnerfäden nur in jedem zweiten der aufeinanderfol­genden Rapporte gleichbindig verlaufen und in die da­zwischenliegenden Rapporte nicht eingebunden sind.5. forming fabric according to one of claims 1 to 3, characterized in that with a linen weave of the forming fabric every second cross thread of this fabric is associated with a partner thread (2) which is in contact with the cross thread and has a smaller diameter than this, so that the partner threads only have the same binding in every second of the successive reports and are not included in the reports in between.
EP19900108910 1989-07-19 1990-05-11 Forming fabric for the wet end of a paper machine Withdrawn EP0408849A3 (en)

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DE3923938A DE3923938A1 (en) 1989-07-19 1989-07-19 FORMING FABRICS FOR THE WET SECTION OF A PAPER MACHINE

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US6073661A (en) * 1994-09-16 2000-06-13 Weavexx Corporation Process for forming paper using a papermaker's forming fabric
US5709250A (en) * 1994-09-16 1998-01-20 Weavexx Corporation Papermakers' forming fabric having additional fiber support yarns
EP0702108A1 (en) * 1994-09-16 1996-03-20 Huyck Licensco, Inc. Papermaker's forming fabric
EP0886002A1 (en) * 1995-12-19 1998-12-23 HUTTER &amp; SCHRANTZ Papiermaschinensiebe Ges.m.b.H. Technical fabric for paper-making machines
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US6145550A (en) * 1997-08-01 2000-11-14 Weavexx Corporation Multilayer forming fabric with stitching yarn pairs integrated into papermaking surface
US5967195A (en) * 1997-08-01 1999-10-19 Weavexx Corporation Multi-layer forming fabric with stitching yarn pairs integrated into papermaking surface
US5881764A (en) * 1997-08-01 1999-03-16 Weavexx Corporation Multi-layer forming fabric with stitching yarn pairs integrated into papermaking surface
USRE40066E1 (en) * 1997-08-01 2008-02-19 Weavexx Corporation Multi-layer forming fabric with stitching yarn pairs integrated into papermaking surface
EP1002892A1 (en) * 1998-11-18 2000-05-24 Thomas Josef Heimbach Gesellschaft mit beschränkter Haftung & Co. Flat textile fabric
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EP1094149A1 (en) * 1999-10-21 2001-04-25 Weavexx Corporation Law caliper mechanically stable multi-layer papermaker's fabrics with paired machine side cross machine direction yarns
US6585006B1 (en) 2000-02-10 2003-07-01 Weavexx Corporation Papermaker's forming fabric with companion yarns
US6354335B1 (en) 2001-02-22 2002-03-12 Tamfelt Oyj Abp Paper machine fabric
US8312900B2 (en) 2007-09-21 2012-11-20 Voith Patent Gmbh Forming fabric
US7931051B2 (en) 2008-01-23 2011-04-26 Weavexx Corporation Multi-layer papermaker's forming fabric with long machine side MD floats
US7766053B2 (en) 2008-10-31 2010-08-03 Weavexx Corporation Multi-layer papermaker's forming fabric with alternating paired and single top CMD yarns
US8251103B2 (en) 2009-11-04 2012-08-28 Weavexx Corporation Papermaker's forming fabric with engineered drainage channels

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DE3923938A1 (en) 1991-01-31
EP0408849A3 (en) 1991-04-24
FI903343A0 (en) 1990-07-03
US5092372A (en) 1992-03-03

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