EP2470716B1 - Blattbildungssieb - Google Patents

Blattbildungssieb Download PDF

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Publication number
EP2470716B1
EP2470716B1 EP11725359.1A EP11725359A EP2470716B1 EP 2470716 B1 EP2470716 B1 EP 2470716B1 EP 11725359 A EP11725359 A EP 11725359A EP 2470716 B1 EP2470716 B1 EP 2470716B1
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EP
European Patent Office
Prior art keywords
threads
longitudinal
fabric layer
thread
fabric
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EP11725359.1A
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German (de)
English (en)
French (fr)
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EP2470716A1 (de
Inventor
Wolfgang Heger
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Andritz Technology and Asset Management GmbH
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Andritz Technology and Asset Management GmbH
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Application filed by Andritz Technology and Asset Management GmbH filed Critical Andritz Technology and Asset Management GmbH
Priority to PL11725359T priority Critical patent/PL2470716T3/pl
Publication of EP2470716A1 publication Critical patent/EP2470716A1/de
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D25/00—Woven fabrics not otherwise provided for
    • 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
    • D21F1/0045—Triple layer fabrics
    • 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

Definitions

  • the invention relates to a multi-ply web forming screen as used in the papermaking process in the sheet forming zone of a wet end of a paper machine for dewatering a pulp suspension.
  • pulp suspension is meant 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 screens, so that the dewatering can take place simultaneously through both screens, whereby the filtration process and thus also the production speed of the paper machine are considerably accelerated. Today paper machines are available for paper grades with low basis weights that can produce at speeds of more than 2000 m / min.
  • multi-layer paper machine screens have been proven for such applications, which have two differently shaped sides, which are adapted to the particular application.
  • Such screens have a paper side formed by the top of an upper fabric.
  • the paper page is commonly referred to as Sieboberseite and is responsible for the formation of the paper sheet.
  • these sieves have a running side, from the bottom of a Lower tissue is formed.
  • the running side which can also be referred to as the underside of the screen, comes into contact with the elements of the paper machine.
  • the respective screen side has a machine direction and a transverse direction, wherein the machine direction (in English MD for "machine direction”) the direction of the paper web and thus the direction of the paper machine screen is understood, and wherein 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
  • transverse direction in English CMD for "cross machine direction "
  • the threads are connected in a particularly intimate and uniform manner to a fabric.
  • the plain weave is for the formation of a paper sheet and thus for the paper side, so little is it usually suitable for the running side. If a paper machine screen is provided with a canvas paper side, it may therefore be advisable to provide a second fabric layer below the plain weave which forms the running side of the screen, which gives the screen sufficient stability and wear potential.
  • a particular challenge in this context is the connection of the two layers (i.e., the top side forming the paper side with the bottom side forming the running side), i.a. This is because the plain weave, which is favorable for the paper side, has extremely unfavorable requirements for such a layered connection.
  • transverse threads which interact 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 thread sections of the functional pair that are not needed for the formation of the paper-side virtually uninterrupted cross-thread run inside the tissue and can be used to attach the lower tissue to the upper tissue.
  • 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 An advantage of this solution is that the binding threads and the transverse threads forming the upper fabric can have the same diameter, whereby the uniformity of the paper side can be increased. Furthermore, the use of materials is kept within limits. On the other hand, however, the bond strength is reduced.
  • EP 0 069 101 which discloses a sheet forming according to the preamble of claim 1, and EP 093 096 also show a ply connection via functional longitudinal thread pairs.
  • EP 1 767 692 A2 discloses a multi-ply fabric in which a paper-side plain weave is tied to a run-side 4-shaft weave.
  • the upper fabric are alternately provided only in the upper fabric extending upper longitudinal thread and a functional pair of longitudinal threads.
  • the respective upper longitudinal thread runs above two pairs of lower longitudinal threads which run exclusively in the lower fabric.
  • the respective functional pair of longitudinal threads on the one hand forms an upper composite longitudinal thread in the upper fabric and, on the other hand, binds the lower fabric to the left and right of a lower longitudinal thread, which is arranged below the upper composite longitudinal thread and runs exclusively in the lower fabric.
  • the lower fabric is made entirely of lower transverse threads and formed lower longitudinal threads and is connected by the meantime in the lower fabric thread section of the functional longitudinal thread pairs only to the upper fabric (the tying thread section acts as a separate, non-woven binding thread).
  • the fabric has a longitudinal thread repeat of eighteen longitudinal threads, three of which are formed as upper longitudinal threads and nine as lower longitudinal threads, with the remaining six longitudinal threads forming three functional pairs.
  • a longitudinal thread ratio of 2: 3 (6: 9) or 1: 2 (6:12) looking at the paired juxtaposed lower longitudinal threads as each exactly one lower longitudinal thread so there is a ratio of 1: 1 (6: 6) or 2: 3 (6: 9)).
  • WO 2004/085740 A2 shows a fabric with a longitudinal thread repeat of 20 threads distributed over four upper longitudinal threads, four functional pairs and eight lower longitudinal threads.
  • WO 2004/085741 A1 The fabric shown has a longitudinal thread repeat of 16 threads distributed among four upper longitudinal threads, four functional pairs, and four lower longitudinal threads to give a 2: 1 (8: 4) or 1: 1 (8: 8) longitudinal thread ratio.
  • the lower fabric is connected by thread sections of the functional pairs only to the upper fabric, ie, the lower fabric is completely and finally formed by lower longitudinal threads and lower transverse threads.
  • EP 1 826 316 A2 a fabric is described whose longitudinal thread repeat consists of four upper longitudinal threads, twelve lower longitudinal threads and four functional pairs (ie a longitudinal thread repeat of 24 threads).
  • the upper chains and the functional pairs form a paper-side canvas that is tied to a complete / complete bottom using functional pairs. At least three different warp systems are required for producing the fabric.
  • the upper longitudinal threads and the functional pairs are arranged alternately, resulting in a superimposition of the paper-side bond pattern with the two different Oberkettsystemen.
  • EP 1 527 229 B1 and EP 1 220 964 B1 each reveal a three-warp warp knitting thread whose warp threads each run in the upper fabric and the lower fabric.
  • the object of the present invention is to provide a sheet forming screen of a multi-layered fabric, which is easy to manufacture and meets the requirements described above, i. e.g. has a high fiber support, high mechanical stability, low tendency to march and a stable layer connection.
  • the invention provides a sheet forming screen according to claim 1. Further embodiments of the sieve according to the invention are described in the dependent claims.
  • the forming wire is formed of a multi-ply fabric having a longitudinal thread repeat of sixteen longitudinal threads, of which four longitudinal threads are formed as upper longitudinal threads and eight longitudinal threads as lower longitudinal threads. The remaining four longitudinal threads form two functional longitudinal thread pairs of two longitudinal threads arranged side by side.
  • each of the four longitudinal threads which form the two functional longitudinal thread pairs extends both in the upper fabric layer and in the lower fabric layer, whereby the upper fabric layer is securely connected to the lower fabric layer.
  • the upper longitudinal threads form together with running in the upper fabric layer transverse threads partially the binding of the upper fabric layer (this is eg the paper-side binding), the eight lower longitudinal threads together with extending in the lower fabric layer transverse threads partially the bond the lower fabric layer (this is eg the running side binding), and the two functional longitudinal thread pairs formed by the remaining four longitudinal threads complete both the binding of the upper fabric layer and the binding of the lower fabric layer.
  • the longitudinal threads of the two functional pairs form two upper composite longitudinal threads and two lower composite longitudinal threads, which fit into the respective weave pattern.
  • At least one of the four longitudinal threads, which form the two functional longitudinal thread pairs extends both in the upper fabric layer and in the lower fabric layer, whereby the upper fabric layer is connected to the lower fabric layer.
  • Those longitudinal threads of the two longitudinal thread pairs which do not run in both fabric layers, run alternately in the upper layer and between the two layers, ie alternately in the upper layer and in the fabric interior.
  • all four longitudinal threads which form the two functional longitudinal thread pairs both in the upper fabric layer and in the lower fabric layer, so that a reliable connection of the fabric layers is ensured.
  • the upper longitudinal threads, together with transverse threads running in the upper fabric layer partially form the binding of the upper fabric layer (this is, for example, the paper-side binding), and the eight lower longitudinal threads already complete, together with transverse threads extending in the lower fabric layer the binding of the lower fabric layer (this is eg the running side binding).
  • the two longitudinal threads of each longitudinal thread pair complete the binding of the upper fabric layer alternately.
  • the longitudinal threads of the two functional pairs thus form two upper Verbündl Kunststoffsfäden, which complete the binding of the upper fabric layer.
  • the at least one longitudinal thread which extends both in the lower and in the upper fabric layer, binds the lower fabric layer, which is completely formed by the lower longitudinal threads, to the upper fabric layer as a separate binder thread. If both longitudinal threads of a functional pair run both in the upper and in the lower fabric layer, the two longitudinal threads of a longitudinal thread pair alternately complete the first binding and, in turn, bind the lower fabric layer completely formed by the lower longitudinal threads to the upper fabric layer. That is, in the latter case, those thread portions of a functional pair that are not being used to form the upper composite longitudinal thread bind at least one sub-fabric transverse thread as a separate binder thread, thereby forming the lower fabric layer to connect with the upper fabric layer. This has the advantage of an increased number of binding points and thus a stronger layer connection. In addition, the two threads of a functional pair in the latter case, the same thread length, resulting in a uniform interweaving.
  • connection of the upper layer with the lower layer thus takes place (at least in part) via functional longitudinal thread pairs, which brings about the advantages described above with respect to a layer connection by means of separate connecting threads or by means of functional transverse thread pairs.
  • functional longitudinal thread pairs e.g. separate connecting threads are provided.
  • the sheet forming according to the invention can be produced with a weaving machine, which with a shaft package of sixteen shafts and is equipped with two warp beams (if the longitudinal threads are formed by warp threads).
  • the sixteen longitudinal threads can be divided into two warp beam units of eight threads each, wherein the first unit comprises the eight lower longitudinal threads of the respective rapport, and wherein the second unit comprises the remaining eight longitudinal threads of the respective repeat.
  • a weaving machine equipped with sixteen shafts and two warp beams is required for the production of a variety of other fabrics / sieves, so that the sieve according to the invention can easily be produced with an existing weaving machine.
  • the inventive sieve can be made in the production breaks of another 16-shaft sieve without prior conversion of the machine.
  • a ratio of 6:10 or 3: 5 is obtained, as for the first embodiment.
  • Such transverse meshes allow a high fiber support, as the paper fibers through the work of Paper machine and the Strömüngsixie in the headbox thereof are mainly aligned in the machine direction.
  • the screen surface has comparable fiber permeability and comparable design higher fiber support capacity.
  • a more cross-oriented paper side of the screen thus provides better fiber support.
  • the comparatively large number of lower longitudinal yarns compensates for a paper-side strength reduction and machine-direction stretch increase associated with the formation of the transverse stitches, ie the reduction in strength and increase in the wire strain in the critical machine direction caused by a reduction in paper-side longitudinal yarns can be increased Number of running side longitudinal threads are compensated.
  • exactly two upper longitudinal threads and / or exactly four lower longitudinal threads are always arranged in the fabric between two functional longitudinal thread pairs, whereby a particularly uniform paper side or running side can be represented.
  • the upper longitudinal threads and the longitudinal threads of the functional pairs have substantially the same diameter. If the longitudinal threads are formed by warp threads, the upper longitudinal threads and the longitudinal threads of the functional pairs can therefore be wound onto a common warp beam.
  • the diameter of the lower longitudinal threads may, for example, be equal to the diameter of the upper longitudinal threads and the longitudinal threads of the functional pairs (in particular in the first embodiment of the invention). Alternatively, the diameter of the lower Longitudinal threads are greater than the diameter of the upper longitudinal threads and the longitudinal threads of the functional pairs (in particular in the second embodiment of the invention).
  • all transverse threads running in the upper fabric are designed as upper transverse threads, which are arranged exclusively in the upper fabric, and / or all transverse threads running in the lower fabric are designed as lower transverse threads, which are arranged exclusively in the lower fabric.
  • the transverse threads running in the lower fabric layer may e.g. have a larger diameter than the transverse threads running in the upper fabric layer.
  • the ratio of transverse threads running in the upper fabric to transverse threads running in the lower fabric may be e.g. greater than 1, e.g. at least or exactly 2: 1 or e.g. at least or exactly 3: 2.
  • the greater number of transverse threads running in the upper fabric favors the formation of the paper-side transverse stitches described above.
  • the invention is not limited to a certain number of transverse threads running in the lower and upper fabrics.
  • 4-shaft binding or 5-shaft binding means that the binding can be produced with 4 or 5 shafts, in other words, the repeat of such a binding has 4 or 5 warp threads or longitudinal threads).
  • the invention is not limited to a particular binding of the upper tissue or a specific binding of the lower tissue.
  • upper fabric and lower fabric may also have the same binding, eg a plain weave.
  • longitudinal yarns threads of the screen / fabric are referred to, which are arranged in the running direction of the paper machine.
  • the longitudinal threads are formed by the warp threads of the loom.
  • Round fabrics realize the longitudinal threads with the shots.
  • transverse threads threads of the screen / fabric are referred to, which are arranged transversely to the direction of the paper machine.
  • the transverse threads are formed by the shots.
  • Round fabrics realize the transverse threads with the chains of the loom.
  • the fabric layer is understood to mean a single-layer fabric consisting of transverse threads and longitudinal thread (or chains and wefts).
  • 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 those threads which are exclusively in the upper fabric and are interwoven there with the upper longitudinal threads (as well as the longitudinal threads of the functional pairs). Upper transverse threads never leave the upper fabric, i. they do not change into the lower 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, ie they do not change into the upper tissue.
  • Lower transverse threads are those threads which are located exclusively in the lower fabric and there are interwoven with the lower longitudinal threads (in the first embodiment of the invention also with the longitudinal threads of the functional pairs). Lower transverse threads never leave the lower tissue, i. they do not change into the upper tissue.
  • a functional pair of longitudinal threads consists of two directly adjacent longitudinal threads whose position in the mesh / fabric is not limited to a fabric layer, ie the longitudinal threads of a functional pair do not run exclusively in a fabric layer.
  • both longitudinal threads of a functional longitudinal thread pair extend both in the lower fabric and in the upper fabric, ie the longitudinal threads of a longitudinal thread pair change between the upper and lower fabric layers (in the first embodiment of the invention and in an alternative of the second embodiment of the invention).
  • one or both longitudinal threads of a functional pair can also change between one of the two layers and the tissue interior (according to a second alternative of the second embodiment).
  • the two threads of a functional pair together fulfill both the task of an upper longitudinal thread (eg a top chain) and a lower longitudinal thread (eg a lower chain) and additionally connect the different layers of fabric through their course.
  • An upper longitudinal thread thus formed and a lower longitudinal thread formed in this way may also be referred to as "upper or lower composite longitudinal threads".
  • the two threads of a functional pair together fulfill the function of an upper fabric-owned longitudinal thread ("upper composite longitudinal thread") and possibly that of a lower non-woven binding thread.
  • a longitudinal thread repeat is the smallest repeating unit of longitudinal threads in the fabric. If the longitudinal threads are formed by warp threads, then the number of threads of the longitudinal thread repeat corresponds to the number of shafts needed to manufacture the fabric.
  • FIGS. 1 to 7 show a fabric according to a first embodiment of the invention.
  • the fabric is a multi-ply fabric and can be used, for example, as a sieve, for example as a forming fabric as needed in the papermaking process.
  • the upper fabric layer is identified by the reference numeral (A), whereas the lower fabric layer is indicated by the reference symbol (B).
  • the upper layer may form the paper side of a screen, and the lower layer may form the running side of the screen, for example.
  • the longitudinal threads can be formed, for example, by warp threads, and the transverse threads can be formed, for example, by weft threads.
  • the fabric shown can thus be produced with a number of sixteen shafts (corresponding to the longitudinal thread repeat of 16 threads) (cf. FIG. 8 ).
  • the sixteen longitudinal threads are divided as follows on the lower fabric layer and the upper fabric layer.
  • the four longitudinal threads 11, 12, 13 and 14 extend exclusively in the upper fabric layer (see, eg Fig. 5 ) and are therefore referred to below as upper longitudinal threads.
  • the eight longitudinal threads 31, 32, 33, 34, 35, 36, 37 and 38 run exclusively in the lower fabric layer (see, eg Fig. 6 ) and are therefore referred to below as lower longitudinal threads.
  • the remaining four longitudinal threads 21, 22, 23 and 24 of the fabric tap are designed as two so-called functional pairs.
  • the two immediately adjacent longitudinal threads 21 and 22 form a first functional pair, and the two immediately adjacent longitudinal threads 23 and 24 form a second functional pair.
  • the four longitudinal threads 21, 22, 23 and 24, which form the two functional pairs, run both in the lower fabric layer and in the upper fabric layer, respectively. these four longitudinal threads 21, 22, 23 and 24 alternate between the upper and lower fabric layers.
  • each longitudinal thread of a functional pair extends over a distance of nine upper transverse threads on the paper side before it leaves.
  • the longitudinal thread 22 alternately passes over and under the nine transverse threads 104-112, and the longitudinal thread 21 runs alternately above and below the transverse threads 114-120 (of the repeat shown) and 101, 102 (of the adjacent repeat).
  • the two functional pairs 21, 22 and 23, 24 thus form two "upper composite longitudinal threads".
  • the upper fabric layer thus has four repeat longitudinal threads and two upper composite longitudinal threads per repeat (see Fig. 5 ).
  • exactly two upper longitudinal threads 12, 13 are arranged between the two functional pairs 21, 22 and 23, 24 or between the two composite longitudinal threads.
  • FIG. 5 takes place the change between the longitudinal threads of a pair of longitudinal yarn below an upper transverse thread (and above the lower transverse threads, as in FIG.
  • Change points are in the Figures 5 and 6 denoted by A1, A2, B1 and B2. According to the embodiment shown, the change points of one functional pair are offset relative to the change points of the other functional pair by three upper transverse threads.
  • FIG. 5a shows the weave pattern of the upper fabric, it being well seen how the two longitudinal threads 21, 22 together form an upper composite longitudinal thread that fits into the binding pattern of the paper side, ie the upper composite longitudinal thread 21, 22 replaces an upper longitudinal thread, otherwise for training the paper-side plain weave would be needed.
  • each longitudinal thread of a functional pair extends over a distance of five lower transverse threads on the running side before it leaves.
  • the two functional pairs 21, 22 and 23, 24 thus simultaneously form two "upper composite longitudinal threads" and two "lower composite longitudinal threads".
  • the lower fabric layer thus has per repeat eight lower longitudinal threads and two lower composite longitudinal threads (see Fig. 6 ).
  • exactly four lower longitudinal threads 33, 34, 35, 36 are arranged between the two functional pairs 21, 22 and 23, 24 or between the two composite longitudinal threads.
  • transverse threads 101 to 120 of the upper fabric layer or the paper side and ten transverse threads 201 to 210 of the lower fabric layer or the running side are assigned.
  • the twenty transverse threads 101 to 120 of the upper layer have a smaller diameter than the ten transverse threads 201 to 210 of the lower layer.
  • the twenty transverse threads 101 to 120 run exclusively in the upper fabric layer, and the ten transverse threads 201 to 210 run exclusively in the lower fabric layer. That is, none of the transverse threads 101 to 120 changes to the running side, and none of the transverse threads 201 to 210 changes to the paper side.
  • the transverse threads 101 to 120 are therefore referred to as upper transverse threads and the transverse threads 201 to 210 as lower transverse threads. It should be noted, however, that the invention is not restricted either to the number of upper and lower transverse threads shown or to the ratio of upper transverse threads to lower transverse threads shown (in this case 2: 1). Also, the diameter of the upper transverse threads, for example, be equal to or greater than the diameter of the lower transverse threads.
  • the four upper longitudinal threads 11-14 and the two upper composite longitudinal threads formed by the two functional pairs 21, 22 and 23, 24 form a plain weave together with the twenty upper transverse threads 101-120 on the paper side and in the upper fabric layer, respectively ,
  • sequence / sequence 1 times over, 1 * times under).
  • the upper composite longitudinal thread 21, 22 extends below the upper transverse thread 101 and above the upper transverse thread 102.
  • the upper longitudinal thread 12 and the upper composite longitudinal thread 23, 24 have the same course as the upper longitudinal thread 11, and the course of the upper longitudinal threads 13 and 14 with respect to the upper transverse threads 101-120 corresponds to that of the upper composite longitudinal thread 21, 22.
  • each of the upper longitudinal threads and upper composite longitudinal threads binds every other upper transverse thread into the fabric. It is noted, however, that the invention is not limited to paper-side plain weave, although it has been found to be suitable.
  • the thread 21 dips into the interior of the fabric and changes to the lower layer.
  • the thread 22 changes at the point marked A1 on the paper side and "replaces" the thread 21 there.
  • the thread 22 then dives back into the interior of the fabric and changes to the lower layer. For this, the thread 21 changes back to the paper side at the point marked A2 and "replaces" the thread 22 there.
  • FIG. 6 As can be seen, the eight lower longitudinal threads 31-38 and the two lower composite longitudinal threads formed by the two functional pairs 21, 22 and 23, 24 together with the ten lower transverse threads 201-210 on the running side and in the lower fabric form a 5-shaft Binding off.
  • the embodiment shown / training the running side is only one of several possible embodiments, ie, it can also be other side links provided, although the binding shown has been found suitable.
  • Geweberapports binds each of the lower longitudinal threads 31-38 and lower composite longitudinal threads 21, 22 and 23, 24 exactly two lower transverse threads and floats over the remaining eight lower transverse threads (see. Fig. 6a ).
  • the Sequence / sequence is "over four lower transverse threads, below a lower transverse thread".
  • the lower longitudinal thread 31 binds the lower transverse threads 201 and 206 and floats over the lower transverse threads 202-205 and 207-210.
  • the slope of in FIG. 6 shown 5-strong binding is two or two lower transverse threads. That is, the next longitudinal thread 32 (ie, the lower longitudinal thread 31 adjacent lower longitudinal thread) binds the lower transverse threads 203 and 208, and the subsequent lower composite longitudinal thread 21, 22 binds the lower transverse threads 205 and 210, etc.
  • both the binding of the upper fabric layer and the binding of the lower fabric layer by the two functional pairs 21, 22 and 23, 24 are completed. That is to say, the longitudinal threads 21, 22, 23, 24 (eg warp threads) are interwoven both with the upper transverse threads (eg upper shots) and with the lower transverse threads (eg lower shots) with completion of the respective fabric or the respective weave.
  • the two functional pairs 21, 22 and 23, 24 contribute to the formation of the respective binding, in the illustrated embodiment to the paper-side plain weave and the running side 5-shaft weave. Further, the paper side and the running side are connected to each other by the two functional pairs 21, 22 and 23, 24.
  • the longitudinal threads of the two functional pairs 21, 22 and 23, 24 serve as textile threads in the lower fabric and in the upper fabric and at the same time act as binding threads.
  • the filaments of the functional pairs according to this embodiment are used both in the lower fabric and on the running side and in the upper fabric and on the paper side, respectively, as an essential component of the respective fabric.
  • Their integration into the respective tissue not only serves to connect the lower tissue to the upper tissue but also to form functional binding points within the respective tissue.
  • the thread 21 changes upward to engage the upper transverse threads 114, 116, 118 and 120, thereby completing the paper-side plain weave.
  • the two longitudinal threads 21 and 22 alternately complete the paper-side weave (in this embodiment, a plain weave) and the run-side weave (a 5-shank weave in this embodiment).
  • FIG. 7 shows the two in FIG. 5 and FIG. 6 separated layers in an "assembly" drawing. Both layers can be seen in the view from above.
  • the top layer represents the paper side of a forming screen.
  • the tissue is substantially always an upper longitudinal thread between two lower longitudinal threads.
  • the upper longitudinal thread 11 lies in the plan view substantially between the two lower longitudinal threads 31, 32
  • the upper longitudinal thread 12 is substantially between the lower longitudinal threads 33, 34
  • the upper longitudinal thread 13 is substantially between the lower longitudinal threads 35, 36
  • the upper longitudinal thread 14 lies substantially between the lower longitudinal threads 37, 38. This results in a ratio of upper to lower longitudinal threads of 4: 8 or 1: 2.
  • an upper transverse thread is arranged in plan view over each lower transverse thread. Furthermore, an upper transverse thread is always arranged between two lower transverse threads. This results in a ratio of upper to lower transverse threads of 20:10 or 2: 1. However, as explained above, this ratio can be varied. An increased number of upper transverse threads, however, favors the formation of the transverse meshes.
  • the diameter of the upper longitudinal threads 11-14 is equal to the diameter of the threads 21-24 of the functional pairs.
  • the uniformity of the paper side is only slightly affected by the four change points A1, A2, B1 and B2 of the two functional pairs.
  • the paper-side weave hardly ever becomes " disturbed, compared to paper-side bindings of the prior art, where exclusively upper composite longitudinal threads or alternately upper longitudinal threads and upper composite longitudinal threads are provided.
  • the upper longitudinal threads 11-14 and the threads 21-24 of the functional pairs can be easily applied to the same warp beam (warp beam X2 in FIG FIG. 8 ).
  • the diameter of the lower longitudinal threads 31-38 can according to the in FIGS. 1 to 7 As shown embodiment, for example, be equal to the diameter of the upper longitudinal threads 11-14 and the threads 21-24 of the functional pairs, whereby a smooth running side can be obtained, which is interrupted only by the four change points A1, A2, B1 and B2.
  • FIG. 2 To illustrate and greatly simplify again the functional division of the longitudinal threads on the paper side (A) and the running side (B) is shown.
  • the impression can arise that the described fabric can already be produced from eight shafts or with a longitudinal thread repeat of 3: 5.
  • FIG. 5 can be seen, the course of the upper longitudinal thread 11 but not equal to that of the upper longitudinal thread thirteenth
  • FIGS. 1 . 3 and 4 show three-dimensional views of the fabric described or Blatt Strukturssiebes.
  • FIG. 8 shows a schematic representation of a loom for the production of the tissue after the FIGS. 1 to 7 , Shown are two warp beams X1 and X2.
  • the first warp beam X1 carries the lower longitudinal yarns
  • the second warp beam X2 carries the upper longitudinal yarns and the longitudinal yarns of the functional pairs.
  • a small portion of the two warp beams shown ie seen in the longitudinal direction of the warp beam X1 follows the thread 38 another thread 31, then another thread 32, etc.
  • the thread 31 of the warp beam X1 is in the shaft S1 hung or passed through it.
  • X4 is shown schematically and designated by the reference numeral X4), which has a longitudinal thread repeat of sixteen longitudinal threads is therefore - if the longitudinal threads are formed of warp threads - a shaft package X3 needed, which consists of sixteen shafts S1, S2, S3, ..., S16 consists.
  • the 16 longitudinal threads are divided into two units of 8 threads each, with each unit having its own warp beam X1 and X2, respectively, and the threads being individually ranked according to their function in the shafts X3 of the loom. This results in a logical assignment of the warp threads according to their function, which was explained above.
  • FIGS. 9 to 11 show a multi-ply fabric according to a second embodiment of the invention, which can be used, for example, as a sieve, for example as a forming screen as it is needed in the process of papermaking.
  • a multi-ply fabric according to a second embodiment of the invention, which can be used, for example, as a sieve, for example as a forming screen as it is needed in the process of papermaking.
  • FIG. 9 In this case, the upper fabric layer in the plan view (ie the paper side of the screen) is shown, whereas FIG. 10 the lower fabric layer in plan view shows.
  • FIG. 11 shows an end view of the multi-layer fabric.
  • the longitudinal threads can be formed, for example, by warp threads, and the transverse threads can be formed, for example, by weft threads.
  • the fabric according to the second embodiment can thus be made as the fabric according to the first embodiment with a number of sixteen shafts, ie, for example, with the in FIG. 8 shown arrangement.
  • the sixteen longitudinal threads are divided as follows on the lower fabric layer and the upper fabric layer.
  • the four longitudinal threads 11, 12, 13 and 14 are formed as upper longitudinal threads and extend exclusively in the upper fabric layer (see Fig. 9 ), whereas the eight longitudinal threads 31, 32, 33, 34, 35, 36, 37 and 38 are formed as lower longitudinal threads extending exclusively in the lower fabric layer (see Fig. 10 ).
  • Each of the four longitudinal threads 21, 22, 23 and 24 extends both in the lower fabric layer and in the upper fabric layer, ie each of these four longitudinal threads 21, 22, 23 and 24 changes within a rapport between the upper and lower fabric layers.
  • each longitudinal thread of a functional pair extends over a distance of five upper transverse threads on the paper side, thereby incorporating three transverse threads.
  • the two functional pairs 21, 22 and 23, 24 thus form two "upper composite longitudinal threads", so that the upper fabric layer per longitudinal thread repeat of the fabric has four upper longitudinal threads and two upper composite longitudinal threads.
  • exactly two upper longitudinal threads 12, 13 are arranged between the two functional pairs 21, 22 and 23, 24 or between the two composite longitudinal threads.
  • the longitudinal thread change of the first longitudinal thread pair 21, 22 takes place below the upper transverse threads 101 and 107, that of the second longitudinal thread pair 23, 24 below the upper transverse threads 104 and 110.
  • the resulting change points are in FIG. 9 denoted by the reference symbols A1, A2, B1 and B2.
  • the Changing points of one functional pair are offset from the change points of the other functional pair by three upper transverse threads.
  • the one longitudinal thread portion of a functional longitudinal thread pair which is currently not in the upper fabric layer binds the lower fabric layer to the upper fabric layer by at least one (in the example shown exactly below) undercut (in the plan view of the lower fabric layer) and thereby binds.
  • the longitudinal thread of the functional longitudinal thread pair tying the lower fabric acts as a separate, "fabric-foreign" bonding thread, ie the thread tying the lower fabric does not contribute to the formation of the running side binding or to the formation of the lower fabric. That is, according to this embodiment, the two functional pairs 21, 22 and 23, 24 do not form "lower composite longitudinal threads".
  • each transverse thread per running side rapport ( FIG. 10 shows four repeats of the running-side binding, see below) incorporated exactly twice, wherein the connected by the functional pair 21, 22 lower transverse threads 203, 207 are already involved by the lower longitudinal threads 32, 33 twice.
  • the lower fabric layer thus has per longitudinal thread repeat of Tissue exactly eight lower longitudinal threads.
  • exactly four lower longitudinal threads 33, 34, 35, 36 are arranged between the two functional pairs 21, 22 and 23, 24.
  • transverse threads 101 to 112 are assigned to the upper fabric layer and eight transverse threads 201 to 208 to the lower fabric layer.
  • the twelve transverse threads 101 to 112 of the upper layer have a smaller diameter than the eight transverse threads 201 to 208 of the lower layer.
  • the twelve transverse threads 101 to 112 are formed as upper transverse threads and extend exclusively in the upper fabric layer, and the eight transverse threads 201 to 208 are formed as lower transverse threads, which extend exclusively in the lower fabric layer. That is, none of the transverse threads 101 to 112 change to the running side and the lower fabric layer, respectively, and none of the transverse threads 201 to 208 change to the paper side and the upper fabric layer, respectively.
  • the invention is not limited to the number of upper and lower transverse threads shown nor to the ratio of upper transverse threads to lower transverse threads shown (here 12: 8 or 3: 2). Also, the diameter of the upper transverse threads may be e.g. equal to or greater than the diameter of the lower transverse threads.
  • the four upper longitudinal threads 11-14 and the two upper composite longitudinal threads formed by the two functional pairs 21, 22 and 23, 24 together with the twelve upper transverse threads 101-112 form a paper-side plain weave.
  • the course of the upper composite longitudinal thread 21, 22 is opposite the course of the upper longitudinal thread 11 offset by exactly one upper transverse thread.
  • the upper longitudinal thread 12 and the upper composite longitudinal thread 23, 24 have the same course as the upper longitudinal thread 11, and the course of the upper longitudinal threads 13 and 14 corresponds to the course of the upper composite longitudinal thread 21, 22.
  • this bond has been found to be suitable for the topsheet or the paper side, the invention is not limited to a paper-side plain weave.
  • FIG. 10 As can be seen, form the eight lower longitudinal threads 31-38 together with the eight lower transverse threads 201-208 a running side 4-shaft binding.
  • the embodiment / design of the lower fabric shown is only one of several possible embodiments, ie, other side bonds may be provided, although the binding shown has been found to be suitable.
  • Each of the eight lower longitudinal threads 31-38 runs alternately above and below a lower transverse thread and thereby binds exactly four lower transverse threads.
  • the lower longitudinal thread 31 binds the lower transverse threads 202, 204, 206 and 208
  • the lower longitudinal thread 32 binds the lower transverse threads 201, 203, 205 and 207, ie the course of the longitudinal thread 32 disposed adjacent to the longitudinal thread 31 offset by a transverse thread.
  • the course of the longitudinal thread 33 arranged adjacent to the longitudinal thread 32 corresponds to the course of the longitudinal thread 32
  • the course of the longitudinal thread 34 arranged adjacent to the longitudinal thread 33 corresponds to the course of the longitudinal thread 31.
  • the thread formed by the lower longitudinal threads 31, 32, 33 and 34 4-shaft binding is by the lower longitudinal threads 35, 36, 37 and 38th repeated.
  • the running side 4-shaft binding is repeated after four lower transverse threads.
  • Each running cross weave repeat binds each lower cross thread twice.
  • the upper longitudinal thread 11 is in the plan view substantially between the two lower longitudinal threads 31, 32 (see. FIG. 11 )
  • the upper longitudinal thread 12 lies substantially between the lower longitudinal threads 33, 34
  • the upper longitudinal thread 13 is substantially between the lower longitudinal threads 35, 36
  • the upper longitudinal thread 14 is substantially between the lower longitudinal threads 37, 38.
  • the result is a longitudinal thread ratio of 6: 8 or 3: 4 (if none of the four Longitudinal threads 21, 22, 23, 24, which according to this embodiment have no fabric function in the lower fabric layer but merely function as separate fabric threads associated with the lower fabric layer). If the four longitudinal threads 21, 22, 23, 24 are evenly distributed on the upper fabric and the lower fabric, a ratio of 6:10 or 3: 5 is obtained as for the first embodiment.
  • the described longitudinal thread ratio of 6: 8 (or 6:10) and the associated reduced number of longitudinal threads on the paper side favors the formation of transverse stitches (see FIG. 9 ), which allow a suitable fiber support.
  • the comparatively large number of lower longitudinal yarns compensates for the reduction in strength and the increase in machine direction strains associated with the formation of the transverse meshes.
  • the diameter of the upper longitudinal threads 11-14 may be equal to the diameter of the threads 21-24 of the functional pair.
  • a uniform paper page can be obtained, which is slightly disturbed only by the four change points A1, A2, B1 and B2.
  • the upper longitudinal threads 11-14 and the threads 21-24 of the functional pairs can be easily arranged on a common warp beam (eg warp beam X2 in FIG FIG. 8 ).
  • the diameter of the lower longitudinal threads 31-38 may be the same as the diameter of the upper longitudinal threads 11-14 and the threads 21-24 of the functional pairs, as in the fabric according to the first embodiment.
  • it is also possible to use for the lower longitudinal threads of threads with a larger diameter since the lower longitudinal threads on a separate Warp beam can be applied (eg warp beam X1 in FIG. 8 ) and the run-side binding is formed exclusively by the lower longitudinal threads.
  • the lower longitudinal threads have a larger diameter than the longitudinal threads of the functional pairs, the lower longitudinal threads protrude further from the running side than the longitudinal threads of the functional pairs running in sections in the lower fabric, so that the longitudinal threads of the functional pairs acting as separate binding threads project through the lower longitudinal threads Abrasion and wear are protected.
  • the fabric according to the second embodiment can be like the fabric according to the first embodiment with the in FIG. 8 produce loom or warp thread arrangement shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Woven Fabrics (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Manufacturing Of Multi-Layer Textile Fabrics (AREA)
EP11725359.1A 2010-05-21 2011-05-17 Blattbildungssieb Active EP2470716B1 (de)

Priority Applications (1)

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DE102010017055A DE102010017055A1 (de) 2010-05-21 2010-05-21 Blattbildungssieb
PCT/EP2011/057978 WO2011144616A1 (de) 2010-05-21 2011-05-17 Blattbildungssieb

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CN102741474A (zh) 2012-10-17
DE102010017055A1 (de) 2011-11-24
RU2527375C2 (ru) 2014-08-27
ES2485385T3 (es) 2014-08-13
US8631832B2 (en) 2014-01-21
RU2012126053A (ru) 2014-06-27
JP5607757B2 (ja) 2014-10-15
KR20120139734A (ko) 2012-12-27
BR112012028079A2 (pt) 2016-08-02
US20130105030A1 (en) 2013-05-02
EP2470716A1 (de) 2012-07-04
CN102741474B (zh) 2015-01-14
BR112012028079B1 (pt) 2020-02-11
WO2011144616A1 (de) 2011-11-24
KR101425421B1 (ko) 2014-07-31
JP2013517388A (ja) 2013-05-16
PL2470716T3 (pl) 2014-10-31

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