EP2764157B1 - Toile pour machine a papier - Google Patents

Toile pour machine a papier Download PDF

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Publication number
EP2764157B1
EP2764157B1 EP12769344.8A EP12769344A EP2764157B1 EP 2764157 B1 EP2764157 B1 EP 2764157B1 EP 12769344 A EP12769344 A EP 12769344A EP 2764157 B1 EP2764157 B1 EP 2764157B1
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EP
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Prior art keywords
threads
transverse
thread
longitudinal
fabric
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EP12769344.8A
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German (de)
English (en)
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EP2764157A1 (fr
Inventor
Wolfgang Heger
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Andritz Kufferath GmbH
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Andritz Kufferath GmbH
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Priority to PL12769344T priority Critical patent/PL2764157T3/pl
Publication of EP2764157A1 publication Critical patent/EP2764157A1/fr
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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

Definitions

  • the present invention relates to a multi-ply papermaking fabric, e.g. a sheet forming screen of a paper machine, in particular a forming screen as used in the process of papermaking in the sheet forming zone of a wet end of a paper machine for dewatering / filtration of a pulp suspension or a paper pulp.
  • a multi-ply papermaking fabric e.g. a sheet forming screen of a paper machine, in particular a forming screen as used in the process of papermaking in the sheet forming zone of a wet end of a paper machine for dewatering / filtration of a pulp suspension or a paper pulp.
  • Such screens are primarily used for high quality, low paper weight graphic papers and high printability requirements. These papers can be produced with so-called gap formers or Gap-Foruiern with speeds up to 2000 m / min. High demands are placed on the mechanical stability, the drainage performance, the fiber support, the freedom from marking and the running time of the sieve.
  • Pulp suspension can be understood as meaning a mixture of wood or cellulose fibers, fillers and chemical auxiliaries suspended in water.
  • the water content is reduced to about 80% by the above-mentioned filtration process.
  • the paper fibers and the fillers and auxiliaries remain evenly distributed in the form of a non-woven fabric on the papermachine fabric.
  • twin-wire machines While in the past drainage was mainly by a paper machine screen applied to a fourdrinier machine, today twin-wire machines are predominantly used, e.g. in the form of a so-called gap former (in English "Gap-Former"). These twin-wire machines are characterized in that the pulp suspension is injected into a gap formed between two paper machine wires, so that the dewatering can take place simultaneously through both wires, whereby the filtration process and thus also the production speed of the paper machine can be significantly accelerated. Today paper machines are available for paper grades with low basis weights that can produce at speeds of more than 2000 m / min.
  • the respective sieve side has a direction of the machine and a transverse direction, whereby the machine direction (in English MD for "machine direction”) is understood to mean the running direction of the paper web and thus also the running direction of the paper machine screen, and the transverse direction (in English CMD for "cross machine direction "), sometimes also called cross-machine direction, which is in the plane of the papermachine fabric rotated by 90 °, ie, the direction transverse to the direction of the paper and the screen direction.
  • machine direction in English MD for "machine direction
  • the transverse direction in English CMD for "cross machine direction "
  • a particular challenge in this case is the connection of the two layers (i.e., the paper side forming ⁇ bergewebes with the running side forming lower fabric), u.a. This is because the plain weave, which is favorable for the paper side, has extremely unfavorable requirements for such a layered connection.
  • tissue-own threads for connecting the layers.
  • the threads used for the layer connection serve on the one hand to connect the layers, for which they switch back and forth between the layers, and on the other hand form the upper fabric or the lower fabric with. It can be used as connecting threads, different thread own threads, ie transverse and / or longitudinal threads of the upper and / or the lower fabric, the different binding threads bring different Siebeigenschaften with it.
  • transverse threads which cooperate as a so-called. Functional transverse thread pair.
  • One or both of the transverse threads of a functional pair run alternately in the upper and lower tissues.
  • the two transverse threads of a functional pair can form a virtually uninterrupted transverse thread of a paper-side plain weave, ie an upper composite transverse thread.
  • Those portions of the thread of the functional pair that are not currently required for the formation of the paper-side virtually uninterrupted transverse thread run inside the fabric and can be used to attach the lower fabric to the upper fabric.
  • the thread section tying the lower fabric can, for example, at the same time complete the lower fabric or its binding.
  • an upper transverse thread can be arranged between two functional transverse thread pairs, which exclusively completes the plain weave (ie which runs only in the upper fabric), but has no binding function.
  • Exemplary embodiments of this approach can be found for example in EP 0 097 966 A2 .
  • WO 99/06632 A1 and WO 02/14601 A1 are examples of this approach.
  • connection of the layers can be effected by so-called functional longitudinal thread pairs.
  • functional longitudinal thread pairs For example, be on EP 0 069 101 and EP 093 096 referenced, which show a layer connection via functional longitudinal thread pairs.
  • a papermaker's fabric according to the preamble of claim 1 is known, for example DE 32 24 236 A1 ,
  • the object of the present invention is to provide a sheet forming screen of a multi-layered fabric which at least partially, esp. Completely meet the requirements described above, ie, for example, a high fiber support, a low Markierne Trent, has a suitable mechanical stability and a stable layer connection.
  • the invention provides a papermaking fabric according to claim 1. Further embodiments of the sieve according to the invention are described in the dependent claims.
  • the sieve according to the invention is formed by an upper transverse thread-bonded, in particular, weft-bound, multi-layered fabric, ie by a multi-layered fabric whose upper layer (preferably exclusively) is connected to the lower layer by means of upper transverse threads.
  • the fabric used for the sieve thus belongs to the group of tissues whose layers are connected by means of tissue-own threads.
  • the connecting upper transverse threads contribute on the one hand to the layer connection and on the other hand to the completion / formation of the upper fabric layer or its binding.
  • the wire according to the invention has on the paper side a high fineness to ensure proper fiber support. Due to the uniform design of the paper side, the tendency to mark is low.
  • the running side can be a ggü. the paper side has increased openness for a good drainage behavior and a reduced tendency to clog the fabric with fibers and contaminants.
  • the running side in particular has a high mechanical stability against elongation. The internal wear and ultimately a ply separation can be avoided or greatly reduced in the multilayer sheet forming screen whose fabric layers are interconnected by upper transverse threads.
  • a fine fabric with a very homogeneous design can be used for sheet formation and tied to a stable and coarser lower fabric.
  • the upper fabric is made in a binding that is comparable to a plain weave and thus optimal for Production of graphic paper is suitable.
  • the lower tissue is coarser in the longitudinal and transverse directions and thus offers the following advantages: solids which may have penetrated into the tissue through the upper tissue are not retained in the lower tissue; the drainage performance of the screen is determined solely by the paper side; the lower tissue is so open that its influence is subordinate to the total flow.
  • the coarse lower fabric is used in particular to optimize the overall screen in terms of mechanical stability and wear resistance and fabric thickness.
  • the paper-side fabric is thus constructed relatively fine and homogeneous.
  • the running side fabric layer can be made more robust and with higher openness, esp. With relatively thick warp and weft threads, which contribute to a higher mechanical strength.
  • the papermaker's fabric according to the invention has an upper fabric layer which is formed of a plurality of upper longitudinal yarns extending exclusively in the upper fabric layer and a plurality of upper transverse yarns interwoven with the upper longitudinal yarn and either completely or predominantly in the upper fabric layer run.
  • the interwoven upper transverse threads and upper longitudinal threads together form an upper binding, ie an overlapping pattern of the upper fabric layer.
  • Characteristic of this upper binding is the upper weave repeat (see below), a pattern that repeats continuously on the paper side, reflecting the course of the upper transverse threads with respect to the upper longitudinal threads.
  • the papermaking fabric of the present invention further has a lower fabric layer formed of a plurality of lower longitudinal yarns extending exclusively in the lower fabric layer and a plurality of lower transverse yarns interwoven with the lower longitudinal yarns and extending exclusively in the lower fabric layer.
  • the interwoven lower transverse threads and lower longitudinal threads together form a lower binding, i. an overlapping pattern of the lower fabric layer. Characteristic of this lower binding is the lower weave repeat, on the run side, constantly repeating pattern.
  • the lower longitudinal threads may have a larger diameter than the upper longitudinal threads
  • the lower transverse threads may have a larger diameter than the upper transverse threads.
  • the ratio of upper longitudinal threads to lower longitudinal threads in the entire fabric is eg greater than or equal to 1, eg greater than 1.
  • the ratio may be 3 to 2 or alternatively 1 to 1.
  • Preferred is the ratio of 3 to 2, which is the formation of a fine top and a coarse bottom favored.
  • the lower transverse threads) are made particularly thick, while still a sufficiently open bottom can be achieved.
  • the tissue may e.g. have a repeating overall repeat in which the ratio of upper longitudinal threads to lower longitudinal threads 9 to 6 or 9 to 9.
  • the ratio of upper transverse threads to lower transverse threads in the entire fabric may be e.g. greater than 1, e.g. 2 to 1. This also favors the formation of a fine top and a coarse bottom.
  • the tissue may e.g. have a repeating overall repeat in which the ratio of upper transverse threads to lower transverse threads is 6 to 3 or 12 to 6.
  • the tissue may e.g. have a repeating overall repeat in which the ratio of upper longitudinal threads to upper transverse threads is 9 to 12 or 9 to 9 or 9 to 6. This represents in each case a balanced ratio of upper longitudinal threads to upper transverse threads, with which a fine upper side can be formed.
  • the respective upper weave repeat has nine upper longitudinal threads and three upper transverse threads according to the invention.
  • Each of the three upper transverse threads of each upper weave repeat has the following course: under one upper longitudinal thread, over the next upper longitudinal thread, under the next upper longitudinal thread, over the next upper longitudinal thread, under the four next, successive upper longitudinal thread and over the next upper one longitudinal thread.
  • the course (or the starting point thereof) of the respective upper transverse thread relative to the course of the adjacent upper transverse thread in the transverse direction is arranged offset by three upper longitudinal threads.
  • the upper transverse threads repeat the course described in the transverse direction continuously and immediately successive, so that the respective upper transverse thread is interwoven with the upper longitudinal threads of the fabric in the manner of a plain weave, whereby regularly a so-called binding zone is formed, in which the upper transverse thread between the Fabric layer or in the lower fabric layer runs, depending on whether it is designed as a connecting upper transverse thread or not.
  • the respective binding zone extends over a distance of four upper longitudinal threads, and between two adjacent binding zones of an upper transverse thread five upper longitudinal threads are arranged.
  • the upper transverse threads are formed as connecting transverse threads in the fabric.
  • the upper transverse threads have a so-called binding zone, which is formed by the thread section which extends below the four upper longitudinal threads.
  • some or all upper transverse threads can temporarily change during its course under the four successive upper longitudinal threads, ie in the binding zone, in the lower fabric layer and there at least undergo a lower longitudinal thread, thereby the lower longitudinal thread and thus attaching the lower tissue to the upper tissue.
  • At least one of the upper transverse threads should therefore be formed as connecting transverse thread.
  • Such a connecting upper transverse thread binds along its course through the tissue in the transverse direction repeatedly (in each binding zone) one or more lower longitudinal threads to the upper Fabric layer, whereby the two layers are joined together.
  • each lower longitudinal thread can be connected to the upper fabric layer at least once, ie, for example, exactly once (see the second embodiment according to FIG. 5 ) or exactly twice (see the second embodiment according to FIG. 6 ).
  • Each connection can be made by a separate upper transverse thread.
  • Bindungsrapporte whose upper transverse threads are all formed as non-connecting upper transverse threads. However, this reduces the number of layer connections in the respective overall repeat.
  • At least one of the three upper transverse threads of each upper weave repeat is formed as a connecting transverse thread. More preferably, at least two, in particular each of the three upper transverse threads of each upper weave repeat are formed as connecting transverse thread.
  • the number of layer connections in the respective overall repeat can be set appropriately as needed or in case of use.
  • the respective connecting upper transverse thread can be used to connect the upper fabric layer with the lower fabric layer during its course under the four successive Upper longitudinal threads undercut exactly one lower longitudinal thread or exactly two consecutive lower longitudinal threads.
  • upper fabric layer and lower fabric layer can be done exclusively with the above-described upper connecting transverse threads. That is, no separate binding threads are needed for the integrity of the fabric.
  • the upper fabric layer can therefore consist exclusively of a plurality of adjacent upper binding repeats. That is, in this case no further threads are arranged between the individual upper binding briefs. Also, the respective upper BinVRgsrapport consist solely of the nine upper longitudinal threads and the three upper transverse threads.
  • the lower transverse threads may be so verwöben with the lower longitudinal threads that they form a dreiMIftige or sechCftige binding in the lower fabric layer, in which the course of the respective lower transverse thread after three or six lower longitudinal threads constantly repeated. These are examples with which a coarse and open running side can be achieved.
  • the respective lower transverse thread may, for example, initially run over a lower longitudinal thread and then under the two subsequent lower longitudinal threads, and the respective lower transverse thread may, for example, initially run over a lower longitudinal thread and then under the five subsequent lower longitudinal threads If the respective total repeat has nine lower longitudinal threads, then the lower fabric layer can be designed, for example, as three-layered or neo-strong.
  • the longitudinal threads are formed as warp threads and the transverse threads as weft threads.
  • transverse threads threads of the screen / fabric are referred to, which extend in the transverse direction of the screen and are arranged transversely to the running direction of the paper machine during operation.
  • the transverse threads are formed by the shots. Round fabrics, on the other hand, realize the transverse threads with the chains of the loom.
  • the fabric layer is understood to be a single-layer fabric consisting of interwoven transverse threads and longitudinal thread (or chains and wefts).
  • the upper fabric or the upper fabric layer is usually a particularly fine fabric layer from which usually the paper side ( ⁇ outwardly facing, upper side of the upper fabric) of the screen is formed, on which the paper fiber layer is formed.
  • the upper fabric is on the "logical top" of the screen.
  • Upper longitudinal threads are such threads that are exclusively in the upper fabric and are interwoven there with running in the upper fabric transverse threads. Upper longitudinal threads never leave the upper fabric, i. they do not change into the lower tissue.
  • Upper transverse threads are threads that are at least predominantly in the upper fabric and are interwoven there with the upper longitudinal threads. Upper transverse threads in the sense of this application can thus either run exclusively in the upper tissue or temporarily change into the lower tissue. At least a part of the upper transverse threads changes into the lower tissue in order to bind it to the upper tissue.
  • Lower longitudinal threads are those threads that are located exclusively in the lower fabric and are interwoven there with running in the lower fabric transverse threads. Lower longitudinal threads never leave the lower tissue, i. they do not change into the upper tissue.
  • Lower transverse threads are those threads that are exclusively in the lower fabric and are interwoven there with the lower longitudinal threads. Lower transverse threads never leave the lower tissue, i. they do not change into the upper tissue.
  • the weave repeat of the upper weave or the so-called upper weave repeat is a recurrent pattern or one of itself repeating unit in the upper fabric of interwoven upper longitudinal threads and upper transverse threads, in particular the smallest repeating unit in the upper fabric.
  • the upper weave repeat therefore represents in particular the recurring overlapping pattern of the upper fabric formed in the plan view of the upper fabric by the upper longitudinal threads and upper transverse threads.
  • the exact course of the upper transverse thread in the lower fabric has the upper binding repeat no influence; because the upper transverse thread runs during this time always under the upper longitudinal threads.
  • the upper weave repeat relates to the course of the upper transverse threads with respect to the upper longitudinal threads and the resulting overlapping pattern; The course of the upper transverse threads with respect to the lower longitudinal threads has no meaning for the determination of the upper binding repeat.
  • a binding repeat of the lower tissue or a so-called lower binding repeat can be defined / specified.
  • the overall repeat of the fabric is a recurrent weave pattern / overlap pattern of the entire fabric, especially the smallest repeating unit of the entire fabric, taking into account the course of all the threads (upper and lower longitudinal threads, upper and lower transverse threads). With knowledge of the total repeat, therefore, the complete fabric or sieve can be produced. That is, the sieve or the tissue may consist of a plurality of immediately juxtaposed total repeats.
  • a longitudinal thread repeat is the smallest repetitive unit of longitudinal threads in the entire fabric.
  • a transverse thread repeat means the smallest repeating unit of transverse threads in the entire fabric.
  • Fig. 1 shows a complete upper binding repeat of a sieve according to the invention in a schematic representation with a view from above.
  • This upper binding repeat is repeated on the sieve top side, ie the sieve top has a plurality of such identically formed upper binding repeats.
  • the paper side of a screen according to the invention can consist of a plurality of such upper binding reports, which are arranged directly adjacent to one another. Ie, to the in Fig. 1 The upper binding repeat shown on the paper side of the sieve then eight immediately adjacent identically formed upper binding repeats are arranged (at the four corners and above, below, right and left).
  • the upper binding repeat consists of 9 longitudinal threads (1, 2, 3, .., 9) and 3 transverse threads (21, 22, 23).
  • the longitudinal threads and transverse threads of an adjacent repeat are provided with one or two "'".
  • each square is an intersection of a longitudinal thread (eg warp thread) and a transverse thread (eg weft thread). If the square is provided with a cross, the longitudinal thread runs over the transverse thread or the transverse thread under the longitudinal thread, otherwise the longitudinal thread runs under the transverse thread.
  • the circle indicates that the longitudinal thread runs under the transverse thread or the transverse thread over the longitudinal thread.
  • each upper transverse thread 21-23 passes first under an upper longitudinal thread, then over the next upper longitudinal thread, then under the next upper longitudinal thread, then over the next upper longitudinal thread, then below four consecutive upper longitudinal threads and finally over the next upper longitudinal thread.
  • the upper transverse thread 21 runs in Fig. 1 first under the upper longitudinal thread 1, then over the upper longitudinal thread 2, then under the upper longitudinal thread 3, then over the upper longitudinal thread 4, then below the four successive upper longitudinal threads 5 to 8 and finally over the upper longitudinal thread 9. Subsequently, the transverse thread repeats 21 this course. That is, in the in FIG. 1 not shown upper binding repeat immediately to the right of the upper binding repeat shown repeats the upper transverse thread 21 the described course, etc .; see especially the FIG. 3 ,
  • the upper transverse thread 22 has the same course, but its course or the starting point thereof is shifted relative to that of the upper transverse thread 21 by three upper longitudinal threads to the right.
  • the upper transverse thread 22 initially passes under the upper longitudinal thread 4, then over the upper longitudinal thread 5, then under the upper longitudinal thread 6, then over the upper longitudinal thread 7, then below the four consecutive upper longitudinal threads 8, 9, 1, 2 and finally, above the upper longitudinal thread 3.
  • the upper transverse thread 22 initially passes under the upper longitudinal thread 4, then over the upper longitudinal thread 5, then under the upper longitudinal thread 6, then over the upper longitudinal thread 7, then below the four consecutive upper longitudinal threads 8, 9, 1, 2 and finally, above the upper longitudinal thread 3.
  • the upper transverse thread 23 has the course described above (once below, once over it, once under it, once over it, 4 times under, once over it), but its course relative to the adjacent upper transverse thread 22 is shifted by three upper longitudinal threads to the right.
  • the course described above for the upper transverse thread 23 begins at the upper longitudinal thread 7, ie, the upper transverse thread 23 extends first under the upper longitudinal thread 7, then over the upper longitudinal thread 8, then below the upper longitudinal thread 9, then over the upper longitudinal thread 1, then below the four successive upper longitudinal threads 2 to 5 and finally over the upper longitudinal thread. 6
  • the course of the respective upper Qüerfadens relative to the course of the adjacent upper transverse thread in the transverse direction offset by three upper longitudinal threads, which in textile technology usually as. Slope is called. That is, according to the invention, the pitch of the upper transverse threads is three in the upper binding repeat and on the paper side, respectively.
  • FIG. 2 As already explained, the paper side of the screen according to the invention is made up of a multiplicity of upper binding reports according to FIG Fig. 1 educated.
  • FIG. 2 and particularly FIG. 3 in which one of the upper binding repeats is identified by a rectangle of solid lines.
  • the eight upper bond repeats immediately adjacent to this upper bond repeat are shown with dashed rectangles, with six of the eight adjacent upper binding repeats in Fig. 2 or 3 are shown only partially.
  • Other than the "X" in Fig. 1 gives the "o" in FIG. 3 assume that the upper cross thread overflows the upper longitudinal thread (or that the upper longitudinal thread runs under the upper cross thread).
  • the upper longitudinal threads are next to each other substantially parallel to each other and spaced from each other.
  • the upper transverse threads are also arranged side by side substantially parallel to each other, so do not form functional pairs.
  • the upper transverse threads can in principle likewise be arranged at a distance from one another, but in sections they touch each other.
  • the upper transverse threads are formed as connecting transverse threads in the fabric. Connecting transverse threads serve to connect the upper fabric layer to the lower fabric layer. According to the invention, this connection takes place during the course of an upper transverse thread below the four successive upper longitudinal threads. The upper transverse thread changes temporarily into the lower fabric layer in order to undermine there one or more lower longitudinal threads and thereby bind to the upper fabric.
  • the sieve according to the invention is a so-called.
  • Wound-bonded or cross-thread-bonded multilayer fabric in particular a pure weft-bound or cross-thread-bonded multilayer fabric, i. a fabric without further connecting threads.
  • FIG. 4 shows alternative embodiments or courses of the upper transverse threads 21 to 23 from FIG. 1 within the entire fabric - ie with respect to upper and lower fabric layers. Shown is the course of an upper one Transverse thread over a distance of nine upper longitudinal threads; the respective course is repeated in the fabric in the transverse direction constantly and directly, ie, the transverse thread 21 is formed for example of a plurality of immediately successive thread sections, each of the course 21a or alternatively each of the course 21b or alternatively the course 21c or alternatively respectively the course 21d correspond.
  • the courses of the threads 21a to 21d with respect to the upper fabric or with respect to the upper longitudinal threads are identical and correspond to the above-described course of the thread 21 (including the starting point).
  • the course of the threads 22a to 22d with respect to the upper fabric corresponds to the course of the thread 22, etc.
  • index "a” marked threads are formed as pure upper transverse threads, which extend exclusively in the upper fabric and do not contribute to a layer connection.
  • the threads marked with the index "b", "c” or “d”, however, are formed as connecting transverse threads, which contribute to a connection of the layers.
  • the threads with the index "b” and “c” bind within a so-called binding zone, which is formed by the cross-thread section running under the four successive upper longitudinal threads, exactly one lower longitudinal thread on the upper fabric layer or undercut this.
  • the threads with the index "b” bind in the transverse direction - viewed from left to right - with the respective first lower longitudinal thread 13, 15 and 11. That is, these threads change in the binding zone immediately down into the lower fabric layer to the connect the first possible lower longitudinal thread to the upper fabric.
  • the threads with the index "c" on the other hand, they bind in the transverse direction - viewed from left to right - with the respective second lower longitudinal thread 14, 10 or 12, ie, these threads overflow the first possible lower longitudinal thread and only bind the subsequent lower longitudinal thread to the upper fabric.
  • the threads with the index "d” bind within the binding zone exactly two lower longitudinal threads on the upper fabric layer or undercut them.
  • FIG. 4 shown upper transverse thread courses are arbitrarily combined with each other as long as from each group exactly one thread is selected, ie it can be any thread from the first group (21a-21d) with any thread of the second group (22a-22d) and any thread of third group (23a-23d) are combined.
  • one or more of the top binding repeats may look like FIG. 3 or three longitudinally adjacent upper transverse threads FIG.
  • At least some of the upper transverse threads are formed as connecting transverse threads in the fabric.
  • at least some of the upper binding repeats e.g. all upper binding repeats, one or more connecting upper transverse threads "b", "c” or "d".
  • the respective upper binding repeat can thus be put together arbitrarily, as long as from each group "21", “22”, “23” exactly one thread is selected, whereby the upper binding repeats can be put together differently (see eg the Figures 5 and 6 ), and wherein at least one of the upper binding repeats has at least one connecting upper transverse thread, so that in the tissue a plurality of connecting threads or in the Automatrapport the fabric at least one connecting thread is present.
  • a sieve according to the invention can thus be produced by juxtaposing a plurality of such total repeats or consisting of a plurality of such total repeats.
  • the in FIG. 5 The overall repeat shown has nine upper longitudinal threads 1-9 and six lower longitudinal threads 10-15, which are here each formed as warp threads and run exclusively in the upper or the lower fabric layer.
  • the upper warp threads 1-9 are thinner than the lower warp threads 10-15.
  • the warp or longitudinal thread ratio of paper side / upper fabric to running side / lower fabric in the total repeat and in the fabric is therefore 9 to 6 and 3 to 2, respectively.
  • FIG. 5 shown overall repeat twelve upper transverse threads 21-23 and six lower transverse threads 31-36.
  • the transverse threads are each formed here as weft threads.
  • the lower transverse threads 31-36 run exclusively in the lower fabric layer.
  • the upper transverse threads change between the two layers of fabric, so they are all as connecting transverse threads formed, however, extend predominantly in the upper fabric layer and form there together with the upper longitudinal threads of the upper fabric and its binding.
  • the upper weft threads are thinner than the lower weft threads 31-36.
  • the weft or transverse thread ratio of paper side / upper fabric to running side / lower fabric in the total repeat and in the fabric is accordingly 12 to 6 and 2 to 1, respectively.
  • each upper transverse thread 21-23 has the same relation to the upper longitudinal threads 1-9 FIG. 1 described course of once under, once over it, once under it, once over it, 4 times under it, once over it.
  • the transverse thread pitch in the overall repeat is three.
  • the respective transverse thread course is repeated in the tissue in the transverse direction constantly.
  • each upper transverse thread together with the upper longitudinal thread on the paper side forms a plain weave (once under, over, etc.) which is repeatedly interrupted along each upper transverse thread along a distance of four upper longitudinal threads to form a binding zone is.
  • the twelve upper transverse threads together with the nine upper longitudinal threads form four upper binding repeats ac, df, gi, jl.
  • the three upper transverse threads 21, 22, 23 of the upper weave repeat ac and the three upper transverse threads, 21, 22, 23 of FIG upper binding repeats gi are in each case formed as "b" threads, which undercut the first of two lower longitudinal threads in their binding zone and thereby bind to the upper fabric.
  • the three upper transverse threads 21, 22, 23 of the upper binding repeat df and the three upper transverse threads 21, 22, 23 of the upper binding repeat jk are each formed as "c" threads, which undercut in their binding zone the second of two lower longitudinal thread and thereby bind to the upper fabric.
  • the course of the transverse threads in the fabric section a-f is identical to the course of the transverse threads in the fabric section g-l.
  • the twelve upper transverse threads thus form, together with the new upper longitudinal threads, two upper Querfadenrapporte a-f, g-l.
  • the six lower transverse threads 31-36 together with the six lower longitudinal threads 10 to 15 form a relatively open and coarse lower fabric or a relatively open and rough running side.
  • the six lower transverse threads 31-36 and the six lower longitudinal threads 10 to 15 form in the total repeat exactly one lower weave repeat.
  • each lower transverse thread undergoes five consecutive lower longitudinal threads and then overflows a lower longitudinal thread; see, e.g. the lower longitudinal thread 36.
  • Each lower transverse thread overflows another lower longitudinal thread.
  • The: lower fabric is here in the transverse direction so 6-Mftig trained, i. the course of the respective lower transverse thread is repeated after six longitudinal threads.
  • the lower fabric is tethered to the upper fabric twelve times within a total repeat, once by each upper transverse thread.
  • Each lower longitudinal thread is tied twice, namely by two different upper transverse threads. Since the upper transverse threads are made thinner than the lower transverse threads, the lower binding (or the overlapping pattern formed by the lower transverse and longitudinal threads) is not significantly disturbed by the upper transverse threads temporarily submerged in the lower fabric. In addition, the lower transverse threads shield the upper transverse threads. It can be so at the same time form a stable layer connection and a fine, homogeneous paper side.
  • a sieve according to the invention may consist of a plurality of such total repeats.
  • the in FIG. 6 shown overall repeat has nine upper longitudinal threads 1-9 and six lower longitudinal threads 10-15, which are each formed as warp threads and extend exclusively in the upper and the lower fabric layer.
  • the upper longitudinal threads 1-9 are thinner than the lower longitudinal threads 10-15.
  • the warp or longitudinal thread ratio of upper fabric to lower fabric in the total repeat and in the fabric is thus again 9 to 6 or 3 to 2.
  • FIG. 6 shown Retrorapport six upper transverse threads 21-23 and three lower transverse threads 41-43.
  • the transverse threads are again formed as weft threads.
  • the lower transverse threads 41-43 run exclusively in the lower fabric layer.
  • the upper transverse threads each change between the two layers of fabric, so they are all formed as connecting transverse threads, but each extending predominantly in the upper fabric layer.
  • the upper transverse threads are thinner than the lower transverse threads 41-43.
  • the weft or transverse thread ratio from paper side to lower fabric in the overall repeat and in the fabric is 6 to 3 and 2 to 1, respectively.
  • Each upper transverse thread 21-23 has respect to the upper longitudinal threads 1-9 with respect to FIG. 1 described course of once under, once over it, once under it, once over it, 4 times under it, once over it.
  • the transverse thread pitch in the overall repeat or in the tissue is again three.
  • the six upper transverse threads together with the nine upper longitudinal threads in the overall repeat form two upper binding repeats a-c, d-f.
  • the three upper transverse threads 21, 22, 23 of the upper weave repeat a-c are each formed as "b" yarns, and the three upper transverse yarns 21, 22, 23 of the upper weave repeat d-f are each formed as "c" yarns.
  • the three lower transverse threads 41-43 together with the six lower longitudinal threads 10 to 15 form a relatively open and coarse lower fabric.
  • the three lower transverse threads 41-43 and the six lower longitudinal threads 10 to 15 form exactly one lower weave repeat in the overall repeat.
  • each lower transverse thread first undergoes two successive lower longitudinal threads., Then overflows a lower longitudinal thread, again undergoing two successive lower longitudinal threads, and then overflows a lower longitudinal thread; see, e.g. The lower longitudinal thread 42.
  • Each lower transverse thread overflows two other lower longitudinal threads, so that each lower longitudinal thread is overrun in the lower binding repeat of a lower transverse thread.
  • the lower fabric is transversely 3-formed here, i. the course of the respective lower transverse thread is repeated after three longitudinal threads.
  • the lower fabric is tied six times to the upper fabric within the overall repeat, once by each upper transverse thread.
  • Each lower longitudinal thread is connected once in the overall repeat. Also with the overall repeat after FIG. 6 At the same time a stable layer connection and a fine, homogeneous paper side can be achieved.
  • a fine upper fabric having a homogeneous design can be used for sheet formation and tied to a more stable and coarser lower fabric.
  • the upper fabric is designed in a binding that is comparable in terms of their sheet-forming properties with a plain weave and thus optimally suited for the production of graphic paper.
  • the lower fabric may be coarser in the longitudinal and transverse directions than the upper fabric and thus offer the following advantages: any solids which have penetrated through the upper fabric into the fabric / sieve are not / hardly retained in the lower fabric; the drainage performance of the sieve is exclusively determined by the Paper side or the upper fabric determines, ie, the lower fabric is formed open so that its influence is subordinate to the total flow.
  • the coarse lower fabric can therefore be used to optimize the screen in terms of mechanical stability, wear resistance and fabric thickness.
  • a very fine and homogeneous paper-side fabric layer is achieved (esp. In comparison to the running side), whereas the running side fabric layer can be performed with higher openness and relatively thick longitudinal and transverse threads, which can contribute to a high mechanical strength.
  • a particularly stable connection of upper fabric layer and lower fabric layer is made possible; generally by a weft or transverse thread-bound formation of the screen and in particular by a special design of the paper side / upper transverse threads with a binding zone.
  • the upper transverse threads each have a course that corresponds in sections to a plain weave, wherein binder zones are created in which the respective upper transverse thread runs under four successive upper longitudinal threads.
  • These bonding zones can be used to tie the lower fabric layer to the upper fabric layer.
  • a high binding frequency and thus a high stability of the sieve can be achieved.
  • the inventive sieve - compared to known sieves - an increase in the binding frequency by up to 33%, using the same number of threads and the same arithmetic fiber support index (FSI Beran).

Landscapes

  • Woven Fabrics (AREA)
  • Paper (AREA)

Claims (11)

  1. Tamis de machine à papier, en particulier tamis de mise en bande, réalisé en tant que toile à plusieurs couches, en particulier toile à deux couches,
    - avec une couche de toile supérieure et une couche de toile inférieure, la couche de toile supérieure présentant une pluralité de fils longitudinaux supérieurs (1-9) qui s'étendent exclusivement dans la couche de toile supérieure et une pluralité de fils transversaux supérieurs (21-23) qui sont entrelacés avec les fils longitudinaux supérieurs et s'étendent respectivement au moins essentiellement dans la couche de toile supérieure,
    - la couche de toile inférieure présentant une pluralité de fils longitudinaux inférieurs (10-15) qui s'étendent exclusivement dans la couche de toile inférieure et une pluralité de fils transversaux inférieurs (31-36) qui sont entrelacés avec les fils longitudinaux inférieurs et s'étendent exclusivement dans la couche de toile inférieure,
    caractérisé en ce que
    - la couche de toile supérieure a, sur son côté supérieur, un rapport de liage supérieur se répétant qui est constitué à partir de neuf fils longitudinaux supérieurs (1-9) et trois fils transversaux supérieurs (21-23),
    - les trois fils transversaux supérieurs (21-23) du rapport de liage supérieur présentent respectivement, dans le rapport de liage supérieur, la trajectoire suivante : par-dessous un fil longitudinal supérieur, par-dessus le fil longitudinal supérieur suivant, par-dessous le fil longitudinal supérieur suivant, par-dessus le fil longitudinal supérieur suivant, par-dessous les quatre fils longitudinaux supérieurs successifs suivants et par-dessus le fil longitudinal supérieur d'après,
    - dans le rapport de liage supérieur, la trajectoire du fil transversal supérieur respectif (21-23) est agencée en décalage de trois fils longitudinaux supérieurs (1-9) dans la direction transversale par rapport à la trajectoire du fil transversal supérieur adjacent, et
    - dans la toile, au moins certains des fils transversaux supérieurs (21-23) sont réalisés en tant que fils transversaux de liaison, qui aux fins de la liaison de la couche de toile supérieure avec la couche de toile inférieure, changent provisoirement dans la couche de toile inférieure au cours de leur trajectoire par-dessous les quatre fils longitudinaux supérieurs successifs et y passent par-dessous au moins un fil longitudinal inférieur.
  2. Tamis de machine à papier selon la revendication 1,
    - dans lequel les fils longitudinaux inférieurs (10-15) ont un diamètre supérieur aux fils longitudinaux supérieurs (1-9) et/ou
    - dans lequel les fils transversaux inférieurs (31-36) ont un diamètre supérieur aux fils transversaux supérieurs (21-23).
  3. Tamis de machine à papier selon la revendication 1 ou 2,
    - dans lequel le ratio entre les fils longitudinaux supérieurs (1-9) et les fils longitudinaux inférieurs (10-15) dans l'ensemble de la toile s'élève à 3 pour 2 ou 1 pour 1 et/ou
    - dans lequel la toile présente un rapport global se répétant dans lequel le ratio entre les fils longitudinaux supérieurs (1-9) et les fils longitudinaux inférieurs (10-15) s'élève à 9 pour 6 ou 9 pour 9 ou elle est constituée d'un tel rapport.
  4. Tamis de machine à papier selon l'une des revendications précédentes,
    - dans lequel le ratio entre les fils transversaux supérieurs (21-23) et les fils transversaux inférieurs (31-36) dans l'ensemble de la toile s'élève à 2 pour 1 et/ou
    - dans lequel la toile présente un rapport global se répétant dans lequel le ratio entre les fils transversaux supérieurs (21-23) et les fils transversaux inférieurs (31-36) s'élève à 6 pour 3 ou 12 pour 6 ou elle est constituée d'un tel rapport.
  5. Tamis de machine à papier selon l'une des revendications précédentes, dans lequel au moins l'un des trois fils transversaux supérieurs (21-23) de chaque rapport de liage supérieur est réalisé en tant que fil transversal de liaison, qui au cours de sa trajectoire par-dessous les quatre fils longitudinaux supérieurs successifs, changent provisoirement dans la couche de toile inférieure et y passent par-dessous au moins un fil longitudinal inférieur afin de relier la couche de toile supérieure avec la couche de toile inférieure.
  6. Tamis de machine à papier selon la revendication 5, dans lequel au moins deux, et en particulier chacun des trois fils transversaux supérieurs (21-23) de chaque rapport de liage supérieur, sont réalisés en tant que fils transversaux de liaison.
  7. Tamis de machine à papier selon l'une des revendications précédentes, dans lequel le fil transversal supérieur de liaison respectif (21-23) passe, au cours de sa trajectoire par-dessous les quatre fils longitudinaux supérieurs successifs, précisément par-dessous un fil longitudinal inférieur (1-9) ou précisément par-dessous deux fils longitudinaux supérieurs successifs (1-9) aux fins de la liaison de la couche de toile supérieure avec la couche de toile inférieure.
  8. Tamis de machine à papier selon l'une des revendications précédentes, dans lequel la liaison de la couche de toile supérieure avec la couche de toile inférieure est exclusivement réalisée par les fils transversaux de liaison supérieurs (21-23).
  9. Tamis de machine à papier selon l'une des revendications précédentes,
    - dans lequel la couche de toile supérieure est exclusivement constituée d'une multitude de rapports de liage supérieurs adjacents l'un à l'autre et/ou
    - dans lequel le rapport de liage supérieur respectif est exclusivement constitué des neuf fils longitudinaux supérieurs (1-9) et des trois fils transversaux supérieurs (21-23).
  10. Tamis de machine à papier selon l'une des revendications précédentes,
    - dans lequel les fils transversaux inférieurs (31-36) sont entrelacés avec les fils longitudinaux inférieurs (10-15) de telle sorte qu'ils forment, dans la couche de toile inférieure, un liage à trois brins ou à six brins dans lequel la trajectoire de chaque fil transversal inférieur se répète respectivement après trois ou six fils longitudinaux,
    - dans lequel dans le cas du liage à trois brins, le fil transversal inférieur respectif (31-36) passe en particulier d'abord par-dessus un fil longitudinal inférieur, puis par-dessous les deux fils longitudinaux inférieurs d'après, et dans le cas du liage à six brins, le fil transversal inférieur respectif (31-36) passe en particulier d'abord par-dessus un fil longitudinal inférieur, puis par-dessous les cinq fils longitudinaux inférieurs d'après.
  11. Tamis de machine à papier selon l'une des revendications précédentes, dans lequel les fils longitudinaux (1-9, 10-15) sont réalisés en tant que fils de chaîne et les fils transversaux (21-23, 31- 36) en tant que fils de trame.
EP12769344.8A 2011-10-04 2012-09-06 Toile pour machine a papier Active EP2764157B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL12769344T PL2764157T3 (pl) 2011-10-04 2012-09-06 Sito maszyny papierniczej

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011054163A DE102011054163B3 (de) 2011-10-04 2011-10-04 Papiermaschinensieb
PCT/EP2012/067456 WO2013050215A1 (fr) 2011-10-04 2012-09-06 Toile pour machine a papier

Publications (2)

Publication Number Publication Date
EP2764157A1 EP2764157A1 (fr) 2014-08-13
EP2764157B1 true EP2764157B1 (fr) 2016-03-02

Family

ID=46982532

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12769344.8A Active EP2764157B1 (fr) 2011-10-04 2012-09-06 Toile pour machine a papier

Country Status (12)

Country Link
US (1) US20140345819A1 (fr)
EP (1) EP2764157B1 (fr)
JP (1) JP5816757B2 (fr)
KR (1) KR101550664B1 (fr)
CN (1) CN103975106B (fr)
BR (1) BR112014008048B1 (fr)
DE (1) DE102011054163B3 (fr)
ES (1) ES2575240T3 (fr)
LT (1) LT2764157T (fr)
PL (1) PL2764157T3 (fr)
PT (1) PT2764157E (fr)
WO (1) WO2013050215A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20155918A (fi) * 2015-12-04 2017-06-05 Valmet Technologies Oy Paperikonekudos
US11339534B2 (en) * 2019-09-18 2022-05-24 Huyck Licensco Inc. Multi-layer warp bound papermaker's forming fabrics
DE102020127184A1 (de) 2020-10-15 2022-04-21 Haver & Boecker Ohg Gewebelage

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE420852B (sv) 1978-06-12 1981-11-02 Nordiskafilt Ab Formeringsvira
SE430425C (sv) * 1981-06-23 1986-09-19 Nordiskafilt Ab Formeringsvira for pappers-, cellulosa- eller liknande maskiner
SE441016B (sv) * 1982-04-26 1985-09-02 Nordiskafilt Ab Formeringsvira for pappers-, cellulosa- eller liknande maskiner
DE3224236A1 (de) * 1982-06-29 1984-03-08 Hermann Wangner Gmbh & Co Kg, 7410 Reutlingen Verbund-gewebe als bespannung fuer den blattbildungs bereich einer papiermaschine
DE3224187C2 (de) * 1982-06-29 1989-01-12 Hermann Wangner Gmbh & Co Kg, 7410 Reutlingen Verband-Gewebe als Bespannung für den Blattbildungsbereich einer Papiermaschine
AT382653B (de) * 1983-09-22 1987-03-25 Hutter & Schrantz Ag Entwaesserungssieb fuer papiermaschinen u.dgl.
JPS62162091A (ja) * 1986-01-09 1987-07-17 日本フイルコン株式会社 製紙用２重織物
FI81624C (fi) * 1988-12-08 1990-11-12 Tamfelt Oy Ab Pappersmaskinduk.
US5238536A (en) * 1991-06-26 1993-08-24 Huyck Licensco, Inc. Multilayer forming fabric
DE4229828C2 (de) * 1992-09-07 1996-07-04 Kufferath Andreas Gmbh Papiermaschinensieb in Form eines Verbundgewebes
GB9604602D0 (en) * 1996-03-04 1996-05-01 Jwi Ltd Composite papermaking fabric with paired weft binder yarns
US5881764A (en) * 1997-08-01 1999-03-16 Weavexx Corporation Multi-layer 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
JP2001336078A (ja) * 2000-05-31 2001-12-07 Nippon Felt Co Ltd 製紙用二層織物
DE10039736A1 (de) * 2000-08-16 2002-03-07 Kufferath Andreas Gmbh Verbundgewebe
US7059357B2 (en) 2003-03-19 2006-06-13 Weavexx Corporation Warp-stitched multilayer papermaker's fabrics
US7357155B2 (en) 2005-12-29 2008-04-15 Albany International Corp. Different contour paired binders in multi-layer fabrics
DE102006016660C5 (de) * 2006-04-08 2009-09-03 Andreas Kufferath Gmbh & Co Kg Oberseite, insbesondere Papierseite, sowie Papiermaschinensieb

Also Published As

Publication number Publication date
DE102011054163B3 (de) 2013-02-28
BR112014008048B1 (pt) 2021-03-30
WO2013050215A1 (fr) 2013-04-11
JP5816757B2 (ja) 2015-11-18
BR112014008048A2 (pt) 2017-04-11
US20140345819A1 (en) 2014-11-27
JP2014532124A (ja) 2014-12-04
CN103975106B (zh) 2016-09-14
CN103975106A (zh) 2014-08-06
PL2764157T3 (pl) 2016-08-31
LT2764157T (lt) 2016-09-12
ES2575240T3 (es) 2016-06-27
PT2764157E (pt) 2016-06-08
EP2764157A1 (fr) 2014-08-13
KR20140082759A (ko) 2014-07-02
KR101550664B1 (ko) 2015-09-07

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