Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F1/00—Wet end of machines for making continuous webs of paper
  • D21F1/0027—Screen-cloths
  • D21F1/0036—Multi-layer screen-cloths

Definitions

• the present invention relates to a multilayered
• Papermaking fabric e.g. a sheet forming sieve one
• Paper machine in particular a batt fabric as used in the process of PandaherStellung 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.
• Pulp suspension can be a mixture of wood or cellulose fibers suspended in water
• 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 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 drainage can take place simultaneously through both screens, whereby the Fiitrationsrea and so that too
• Direction is, i. the arranged transversely to the direction of the paper and the screen direction.
• Paper machine screens can usually be exchanged neither paper and running soap, nor machine and transverse direction, otherwise the functioning of the screen is not or not sufficiently guaranteed.
• the paper side e.g. by providing a
• the plain weave is for the formation of a paper sheet and thus for the paper side, as little is it usually suitable for the running side, becoming a paper machine screen with a canvas paper side
• a particular challenge is the connection of the two layers (i.e., the paper side forming
• Plain weave has unfavorable conditions for such a layer connection.
• Bindefäden provides, which in the longitudinal or transverse direction
• Bindefäden do not contribute to the structure of the respective fabric layer binding / needed.
• the two fabric layers consist of longitudinal threads and transverse threads, which run exclusively in the respective fabric layer and thereby the respective
• Bindefäden the originally homogeneous structure of the bond are disturbed, so that especially in the provided on the paper side plain weave stains would arise that cause marks in the paper.
• the thin binding threads are mainly used for
• the threads used for the layer connection serve on the one hand to connect the layers, for which they change between the layers back and forth, and on the other hand form the upper fabric or the
• Z two active transverse thread pairs may be e.g. an upper transverse thread which exclusively supports the plain weave (i.e., which runs only in the upper fabric) but has no binding function.
• Object of the present invention is a
• Sheet forming screen made of a multi-layered fabric
• the invention a
• Papermaking fabric according to claim 1 ready. Further, Papermaking fabric according to claim 1
• the sieve according to the invention is of a
• 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 sieve according to the invention has on the paper side a high fineness to ensure a convenient
• 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 increased openness for a good drainage behavior and a reduced tendency to
• the running side has a high in particular
• the inner wear and ultimately a ply separation can be in the multilayer
• Sheet forming screen the fabric layers are connected by upper transverse threads together, avoided or greatly reduced.
• a fine fabric having a very homogeneous design can be used for sheet formation and tied to a stable and coarser lower fabric.
• Upper fabric is made in a binding that is comparable to a plain weave and thus optimal for S
• Lower tissue is especially coarser in the longitudinal and transverse directions and thus offers the following advantages: any solids that 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 on the
• Total flow is subordinate.
• the coarse lower tissue is used in particular for the overall sieve
• tige tissue 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 wetting and weft threads, which contribute to a higher mechanical strength. It is a stable
• the papermaker's fabric according to the invention has an upper fabric layer 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 yarns and either completely or predominantly in the upper fabric layer
• the interwoven upper transverse threads and upper longitudinal threads together form an upper binding, i. an overlapping pattern of the upper fabric layer.
• Binding repeat (see below), a repetitive pattern on the paper side, which shows the course of the upper transverse threads with respect to the upper longitudinal threads.
• the papermaking fabric according to the invention further has a lower fabric layer, which consists of a plurality of lower
• the lower longitudinal threads may have a larger diameter than the upper longitudinal threads, and the lower transverse threads may have a larger diameter than the upper
• 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.
• the ratio of 3 to 2 which is the formation of a fine upper side and a coarse lower side, is preferred favored.
• the lower transverse threads are made particularly thick, while still a sufficiently open bottom can be achieved.
• the tissue may e.g. a repetitive one
• 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. a repetitive one
• the tissue may e.g. a repetitive one
• 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
• 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 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, with a so-called.
• the respective binding zone extends over a distance of four upper
• At least some of the upper transverse threads are in the fabric as connecting transverse threads
• the upper transverse threads have a so-called.
• Binding zone which is formed by the thread portion which extends below the four upper longitudinal threads.
• Connecting the upper fabric layer to the lower fabric layer may cause some or all of the upper transverse threads during their operation
• Cross threads should therefore be formed as connecting transverse thread at least one of the upper transverse threads.
• Such a connecting upper transverse thread binds along its
• each lower longitudinal thread at least once to the upper
• Fabric layer be connected, so for example 5) or exactly twice (see the second embodiment according to FIG. 6), whereby each connection can be made by a separate upper transverse thread, in that in the respective overall repeat of the
• Tissue is connected by means of the upper transverse threads of each lower longitudinal thread at least once to the upper fabric layer, a stable layer connection and thus a long lifetime of the screen can be achieved.
• Bindungsrapporte whose upper transverse threads are all formed as non-connecting upper transverse threads. This reduces
• 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 respective connecting upper transverse thread can for
• Fabric layer can be done exclusively with the above connecting upper transverse threads. That is, there will be no separate binding threads for the integrity of the fabric
• the upper fabric layer can therefore exclusively from a
• the respective upper binding repeat can consist exclusively of the nine upper longitudinal threads and the three upper transverse threads.
• the lower transverse threads can be so with the lower
• Longitudinal threads are interwoven that they form a dreiMftige 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.
• Running side can be achieved.
• the respective lower transverse thread can be used in the three-shed binding e.g. run first over a lower longitudinal thread and then under the two subsequent lower longitudinal threads, and the respective lower
• Cross thread may be at the sixfold binding e.g. first over a lower longitudinal thread and then under the five
• the lower fabric layer can be designed, for example, as three-stitched or neo-strong.
• the longitudinal threads are preferred as warp threads and the
• longitudinal yarns threads of the screen / fabric are referred to, which extend in the longitudinal direction or longitudinal extent of the screen and are arranged in operation in the running direction of the paper machine.
• the longitudinal threads are formed by the warp threads of the loom, whereas round weaves are
• 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).
• Paper fiber layer is formed.
• the upper fabric is on the "logical top” of the screen.
• 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
• Registration can be either exclusively in the
• Upper tissues run 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.
• Sub-woven transverse threads are interwoven.
• 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,
• Paper side of the screen are a variety of such upper ones
• the upper weave repeat therefore represents in particular the recurring overlapping pattern of the upper fabric formed by the upper longitudinal threads and upper transverse threads in the plan view of the upper fabric. If one of the upper transverse threads temporarily changes into the lower fabric, then the exact course of the upper fabric has changed
• 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 significance 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 egg of the entire fabric, taking into account the course of all the threads (upper and lower longitudinal threads, upper and lower transverse threads).
• the entire fabric or sieve can be made. That is, the screen or fabric may be made of a plurality of directly juxtaposed ones
• 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 is a plan view of a complete upper binding repeat of a sieve according to the invention in a schematic representation
• Fig. 2 is a photograph showing an enlarged view of a section of the paper side of a sieve according to the invention, which consists of a plurality of mutually angre Zenden upper Bindungsrapporten, i. a plan view of the top of a sieve according to the invention or its
• FIG. 3 shows the photograph from FIG. 2, with a single upper bond repeat (solid lines) and the eight surrounding upper binding replicas (dashed lines) highlighted, FIG.
• Fig. 4 shows various alternative courses for the three upper transverse threads of the upper weave repeat of Fig. 1 within the entire fabric, i. with regard to the upper and lower fabric layer / longitudinal threads,
• Fig. 5 shows the total repeat of a sieve according to a first embodiment of the invention in a schematic representation
• Fig. 6 shows the total repeat of a sieve according to a second embodiment of the invention in a schematic representation.
• Fig. 1 shows a complete upper binding repeat of a sieve according to the invention in a schematic representation
• the paper side of a screen according to the invention may e.g. consist of a plurality of such upper binding repeats, which are arranged directly adjacent to each other. That is, to that in Fig. 1
• Paper side of the screen then eight immediately adjacent identically formed upper binding repeats arranged (at the four corners and above, below, right and left).
• the upper weave repeat consists of 9 longitudinal threads (1, 2, 3, 9) and 3 transverse threads (21, 22, 23).
• the upper weave repeat consists of 9 longitudinal threads (1, 2, 3, 9) and 3 transverse threads (21, 22, 23).
• each square represents an intersection of a longitudinal thread (e.g.
• Warp thread and a transverse thread (for example weft thread). If the square is provided with a cross, the longitudinal thread runs over the transverse thread or the transverse thread runs under the longitudinal thread,
• Binding repeat the courses of the three upper transverse threads 21-23 with respect to the nine upper longitudinal threads 1-9 basically the same.
• 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 i Fig. 1 initially under the upper longitudinal thread 1, then over the upper longitudinal thread 2, then below 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 21 repeats this course. That in which the upper weave repeat not shown in FIG. 1 immediately to the right of the upper weave repeat shown, the upper transverse thread 21 repeats
• the upper transverse thread 22 has the same course, however, 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 course described above begins (once under, once over, once under, once over, sometimes over, once over) for the upper transverse thread 22 at the upper longitudinal thread 4, ie, the upper transverse thread 22 initially runs 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
• the upper transverse thread 23 has the above-described course ⁇ once under, once over it, once under it, once over it, 4 times under, once over it), but its course is shifted relative to the adjacent upper transverse thread 22 by three upper longitudinal threads to the right.
• the Ve described above starts for the upper transverse thread 23 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 above the upper Longitudinal thread 1, then below the four
• the course of the respective upper transverse thread relative to the course of the adjacent upper transverse thread is transversely offset by three upper longitudinal threads, which is usually referred to as a gradient in texturing technology. That is,
• the pitch of the upper transverse threads in the upper binding repeat or on the paper side is three.
• FIG. 1 This is illustrated by FIG. 2 and in particular 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 Bindungsrapporte in Fig. 2 and 3 are shown only partially.
• the "o" in FIG. 3 indicates that the upper transverse thread overflows the upper longitudinal thread (or that the upper one is overflowing)
• the upper longitudinal threads are arranged next to one another substantially parallel to one another and at a distance from one another.
• 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 also be arranged at a distance from each other, however
• At least some of the upper transverse threads are formed as connecting transverse threads in the fabric.
• this connection takes place during the course of an upper transverse thread below the four successive upper longitudinal threads.
• the upper transverse thread transitions temporarily into the lower fabric layer in order to undermine there or more e lower longitudinal threads and thereby bind to the upper fabric.
• the sieve according to the invention is a so-called.
• Weft-bound or cross-thread-bonded multilayer fabric esp. a purely Schussduses or Querfadentraveles
• 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 - i. in terms of upper and lower
• transverse thread 21 is e.g. formed from a plurality of immediately successive thread sections, which in each case the course 21a or alternatively in each case the course 21b or alternatively in each case the.
• 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 ⁇ incl. 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 run exclusively in the upper fabric and do not contribute to a layer connection.
• the threads marked with the index "b,” c “or” d “ are formed as connecting transverse threads, which contribute to a connection of the layers.
• 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.
• the upper transverse thread courses shown in FIG. 4 can be arbitrary
• each group can be combined with each other as long as from each group exactly one thread is selected, i. it can be any thread from the first group (21a-21d) with any thread of the second group (22 a - 22 d) and any thread of
• third group (23a-23d) are combined.
• 3 or three longitudinally adjacent upper transverse threads from FIG. 3 may be formed from the threads 21c, 22c, 23c, or from the threads 21b, 22b, 23b, or from the threads 21a, 22a, 23a (so it is also possible that one or more upper binding repeats, but not all, exclusively of non-connecting upper
• Transverse threads are formed), or from the threads 21a, 22b, 23c,
• Transverse threads formed.
• 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, wherein the upper binding repeats can be composed differently ⁇ see eg Figures 5 and 6), and wherein at least one of the upper binding repeats
• 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 overall repeat shown in FIG. 5 has nine upper longitudinal threads 1-9 and six lower longitudinal threads 10-15, which are here each designed 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 ones
• Warp threads 10-15 The warp or longitudinal ratio of
• the total repeat and in the fabric is 9 to 6 and 3 to 2, respectively.
• the overall repeat shown in FIG. 5 has twelve upper transverse threads 21 to 23 and six lower transverse threads 31 to 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, run
• the upper weft threads are thinner than the lower weft threads 31-36, the shot or
• each upper transverse thread 21-23 with respect to the upper longitudinal threads 1-9 has the reference to FIG. 1
• 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. In the tissue, each forms upper
• Paper side therefore a plain weave (once under, once over it, etc.), the along each top transverse thread repeatedly in sections along a distance of four upper longitudinal threads to form a binding zone
• Transverse threads 21, 22, 23 of the upper weave repeat ac and the three upper transverse threads' 21, 22, 23 of the upper weave repeat gi are each as "b" - formed filaments, soft the first of two lower longitudinal yarn in their bonding zone
• Binding replicas jk are each designed 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 af is identical to the course of the transverse threads in the fabric section gi.
• Cross threads 31-36 together with the six lower longitudinal threads 10 to 15 a relatively open and coarse üntergewebe 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 the total repeat exactly one lower
• An inventive sieve can from a
• the Gesaratrapport shown in Figure 6 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 ones
• the total repeat shown in FIG. 6 has 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
• the upper transverse threads each change between the two fabric layers, ie they are all formed as connecting transverse threads, but in each case extend predominantly in the upper fabric layer.
• the upper transverse threads are thinner
• the weft or transverse thread ratio of paper side to outer fabric in the total repeat and in the fabric is 6 to 3 and 2 to 1, respectively.
• Binding repeats a-c, d-f 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 part.
• 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 initially underwent 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 upper fabric is executed in a binding, the
• the lower fabric may be coarser in the longitudinal and transverse directions than that
• Upper tissue may have by the upper tissue in the tissue / sieve penetrated solids are not / hardly held in the lower tissue; the
• Drainage of the sieve is exclusively by the Paper side or the upper fabric determines, ie, the lower fabric is open so formed that its influence on the
• the coarse lower tissue can therefore be used to the sieve
• the upper transverse thread each have a course that corresponds in sections to a plain weave, wherein
• Binding zones are created in which the respective upper
• sieve according to the invention compared to known sieves - achieve an increase in the binding frequency by up to 33%, using the same number of threads and the same computational fiber support index (Beran FSI).

Landscapes

• Woven Fabrics (AREA)
• Paper (AREA)

Priority Applications (9)

Applications Claiming Priority (2)

Publications (1)

Family

ID=46982532

Family Applications (1)

Country Status (12)

Families Citing this family (3)

Citations (13)

Family Cites Families (5)

• 2011
  • 2011-10-04 DE DE102011054163A patent/DE102011054163B3/de not_active Expired - Fee Related
• 2012
  • 2012-09-06 EP EP12769344.8A patent/EP2764157B1/de active Active
  • 2012-09-06 PT PT127693448T patent/PT2764157E/pt unknown
  • 2012-09-06 ES ES12769344.8T patent/ES2575240T3/es active Active
  • 2012-09-06 KR KR1020147011357A patent/KR101550664B1/ko active IP Right Grant
  • 2012-09-06 BR BR112014008048-8A patent/BR112014008048B1/pt active IP Right Grant
  • 2012-09-06 CN CN201280059456.4A patent/CN103975106B/zh active Active
  • 2012-09-06 JP JP2014533815A patent/JP5816757B2/ja active Active
  • 2012-09-06 LT LTEP12769344.8T patent/LT2764157T/lt unknown
  • 2012-09-06 PL PL12769344T patent/PL2764157T3/pl unknown
  • 2012-09-06 US US14/349,361 patent/US20140345819A1/en not_active Abandoned
  • 2012-09-06 WO PCT/EP2012/067456 patent/WO2013050215A1/de active Application Filing

Patent Citations (13)

Also Published As

Similar Documents

Legal Events