EP1586696B1 - Formiersieb - Google Patents

Formiersieb Download PDF

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Publication number
EP1586696B1
EP1586696B1 EP05102771A EP05102771A EP1586696B1 EP 1586696 B1 EP1586696 B1 EP 1586696B1 EP 05102771 A EP05102771 A EP 05102771A EP 05102771 A EP05102771 A EP 05102771A EP 1586696 B1 EP1586696 B1 EP 1586696B1
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EP
European Patent Office
Prior art keywords
machine direction
threads
binding
thread
forming fabric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP05102771A
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German (de)
English (en)
French (fr)
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EP1586696A1 (de
Inventor
Stewart Lister Hay
Johann Boeck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
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Voith Patent GmbH
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Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1586696A1 publication Critical patent/EP1586696A1/de
Application granted granted Critical
Publication of EP1586696B1 publication Critical patent/EP1586696B1/de
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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 invention relates to a forming fabric according to the preamble of patent claim 1.
  • Forming screens are used in the forming section of a paper machine.
  • a fiber suspension is applied from the headbox of the paper machine to a forming fabric or to two forming fabrics (Gap formers). It is the task of forming fabrics to dewater the fiber suspension and to form a fibrous web, with as little pulp fibers and fillers as possible being washed out of the fiber suspension during the dewatering process.
  • the quality of the fibrous web formed is strongly influenced by the structure of the fibrous web-facing surface (paper side) of the forming fabric.
  • the life of the forming fabric is greatly affected by the structure of the paper machine facing surface (machine side) of the forming fabric.
  • multi-ply papermachine screens have been developed with a paper-side and a machine-side fabric, wherein the two independent fabrics are connected to each other by so-called stitching or binding threads.
  • stitching threads are an integral part of the paper-side weave structure (integral stitching threads), as a result of which marking tendencies due to the binding of the stitching threads are reduced.
  • each first and each second binding region is formed by running the first and second stitching yarns under at least two and at most three mutually adjacent lower machine direction yarns.
  • the paper-side weave structure and the machine-side weave structure are connected by the stitching thread (s) in which the stitching thread (s) coming from the paper-side weave structure are repeatedly formed under a lower, for example, machine direction yarn to create a weave area and subsequently woven again with threads from the paper-based weave structure.
  • the region of the machine-side weave structure, which is bound by the stitching thread is to be defined as the binding region, which span one or more lower MD threads.
  • the stitching thread on one side of the paper-side weave structure is fed to the MD thread, then passes under this MD thread and is then subsequently led away from the MD thread to the paper-side weave structure again.
  • the binding area is thus spanned by a lower MD thread.
  • two lower MD threads define the binding area; a first lower MD thread to which the stitching thread is fed from the paper side weave structure and under which the stitching thread runs, and a second lower MD thread under which the stitching thread runs and from which the stitching thread is fed back to the paper side weave structure, between them both lower MD threads of the stitching thread neither runs to the paper-side weave structure nor comes from this.
  • the force of the stitching thread acting in the direction of the paper-side weaving structure can not be transmitted due to the deflection of the "suspended" lower machine direction thread.
  • the invention is based on the consideration that the connection of the paper-side woven structure to the machine-side weave structure can be improved in a forming fabric with integral stitching threads by the force exerted by a stitching thread on the machine-side weave structure and acting in the direction of the machine-side weave structure from a lower (Machine-side) machine direction yarn (MD yarn) is divided on at least two maximum but three lower MD yarns. That According to the invention, it is a binding region with two to three lower MD threads.
  • these hinged lower MD yarns Due to the distribution of force from one to two or three lower MD yarns, these hinged lower MD yarns have a significantly smaller deflection than a single hinged lower MD yarn, thereby increasing the paper-side weave structure to the entire machine-side weave structure can be transmitted, so that the connection of the paper-side weaving structure is improved to the machine-side weaving structure. As a result, the forming fabric becomes thinner and more compact.
  • a binding portion is formed by passing the stitching thread under all the MD threads of the binding portion, whereby, contrary to the case where the stitching thread in the binding portion runs over one or more lower MD threads, the screen of the present invention is thinned can.
  • the first stitching thread or the second stitching thread runs under at least two and at most three mutually adjacent lower machine direction threads.
  • a preferred embodiment of the invention therefore provides that a maximum of three lower machine direction threads are arranged between a first and a second binding region.
  • the first stitching thread of a pair having a number of upper machine direction threads weaves first segments. Further, the pair's second stitching thread weaves second segments with a number of other top MD yarns, with the first and second segments arranged alternately one behind the other in the cross-machine direction.
  • the segment of the paper-side weave structure woven by a stitching thread should be defined as the segment, which span one or more upper MD threads.
  • the stitching thread is fed from the machine-side weave structure on one side to the upper MD thread, then passes over this upper MD thread and is then subsequently led away from the upper MD thread to the machine-side weave structure.
  • the segment is clamped by an upper MD thread.
  • two upper MD yarns delimit the segment; a first upper MD thread to which the stitching thread is fed from the machine side weave structure and over which the stitching thread runs and a second upper MD thread over which the stitching thread passes and from which the stitching thread is returned to the machine side weave structure, between these two Upper MD threads of the stitching thread neither to the machine-side weave structure still comes from this.
  • the weave structure formed by the upper MD threads and the upper cross-machine direction threads is continued by the first and the second segments.
  • the size of the segments has a direct influence on the marking tendency and the planarity of the paper-based web structure. If the segments are too small form "hard” binding sites with too much marking tendency. If the segments are too large, the paper-side weave structure may bulge around the segments, with the result that the planarity of the paper-side weave structure becomes unsatisfactory. Investigations have shown that a particularly smooth paper-side surface is created when each first and every second segment is formed with at least two and at most five mutually adjacent upper machine direction threads.
  • each first segment and the first binding region or between each second segment and the second binding region respectively a first and second transition region, in which the first and second stitching thread runs between mutually adjacent pairs of upper and lower machine direction threads, respectively.
  • a preferred embodiment therefore provides that each first and each second transition region is formed in each case with a maximum of three mutually adjacent pairs of upper and lower MD threads. This steep connection binds the paper-side and machine-side weave closer together. The more intimate connection between the two weave structures also reduces the so-called "edge-curl effect" (bulging of the edge areas of the screen).
  • the planarity of the paper-side weave structure can be further improved by running the first stitching thread of one pair per unit of repeat of the cross-machine direction weave structure above and below as many upper machine direction threads as the second stitching thread.
  • both stitching threads of each pair traverse the same path in the cross-machine direction during weaving with the upper and lower machine direction threads.
  • a preferred embodiment of the invention therefore provides that, per repeat unit of the cross-machine direction web structure, the first and second stitching yarns of each pair travel the same path under, over and between the upper and lower machine direction yarns.
  • the paper-side weave structure of the forming fabric according to the invention is formed as a plain weave pattern.
  • a preferred embodiment of the invention provides that the first and the second segments each having three adjacent upper machine direction yarns, the first and the second transition regions each having a maximum of two mutually adjacent pairs of upper and lower machine direction yarns and the first and the second bonding regions each with two mutually adjacent lower machine direction threads are formed.
  • a preferred embodiment of the invention provides that between two mutually adjacent pairs of first and second stitching threads, two lower cross machine direction yarns and one upper cross machine direction yarn are arranged. This ratio corresponds to a CD thread ratio of 1: 1.
  • two lower transverse machine direction threads and two upper cross machine direction threads are arranged between two mutually adjacent pairs of first and second stitching threads.
  • This ratio corresponds to a CD thread ratio of 3: 2.
  • a further embodiment of the invention provides that a lower transverse machine direction yarn and an upper transverse machine direction yarn are arranged between two mutually adjacent pairs of first and second tacking yarns. This ratio corresponds to a CD thread ratio of 2: 1.
  • each of the lower CMD yarns passes over one and then under at least seven machine direction yarns adjacent each other.
  • Another advantage of the so-called long floating is that the proportion of lower CD threads within the screen is reduced, which on the one hand makes a smaller thickness of the screen possible and on the other hand can result in lower drainage resistance.
  • a further preferred embodiment of the invention provides that at least two pairs of first and second stitching threads are arranged directly adjacent to each other. Generally, by increasing the pairs of twine, the number of tethers is increased, thereby achieving a better bonding of the upper weave structure to the lower weave structure and a higher stiffness of the forming fabric.
  • each pair of first and second stitching threads are arranged between at least two upper CMD yarns.
  • first and second stitching yarns of a pair of stitching yarns may be disposed relative to the bottom CMD yarns.
  • a preferred embodiment of the invention provides that at least one pair of stitching threads is provided in which a lower cross machine direction yarn is arranged between the first stitching thread and the second stitching thread of the pair.
  • a further preferred embodiment of the invention provides that at least one pair of stitching threads is provided in which the first and second stitching threads are arranged between at least two bottom CMD threads.
  • a lower tying site formed by passing a lower cross machine direction yarn below a first lower machine direction yarn and over a second lower machine direction yarn adjacent thereto, the second lower machine direction yarn immediately adjacent a lower machine direction yarn of a first machine direction yarn second binding region is arranged.
  • the second lower machine direction thread is a lower machine direction thread of the first or second binding area.
  • the repeat unit is a forming fabric in which the repeat unit has 8 upper and 8 lower machine direction yarns.
  • FIG. 1 shows a repeat unit of the weaving pattern of a forming fabric according to the invention.
  • the forming fabric comprises a plurality of upper MD yarns 1,3,5,7,9,11,13,15, a plurality of lower MD yarns 2,4,6,8,10,12,14,16, a Plurality of upper CD threads T1, T2, T3, T4, a plurality of lower CD threads B1, B2, B3, ..., B8, and pairs of first and second stitching threads I1 and I2, I3 and I4, I5 and I6 , I7 and I8.
  • the repeat unit 8 has upper and 8 lower machine direction threads.
  • the repeat unit is constituted by the lower and upper MD threads 1 to 16, the upper CD threads T1, T2, T3, T4, the lower CD threads B1 to B8, and the pairs of first and second stitching threads I1 and I2, I3 and I4, I5 and I6, I7 and I8.
  • the repeat unit is thus formed by 16 MD or warp threads.
  • the paper-side weave structure is formed by interweaving the upper MD yarns 1,3,5,7,9,11,13,15 with the upper CD yarns T1, T2, T3, T4 and in which the upper MD Yarns 1, 3, 5, 7, 9, 11, 13, 15 are respectively interwoven with the first and second stitching yarns I1 and I2, I3 and I4, I5 and I6, I7 and I8 of a pair so as to produce that of upper MD threads 1,3,5,7,9,11,13,15 and the upper CD threads T1, T2, T3, T4 formed web structure is continued.
  • the upper CD thread T1 passes over the upper MD threads 1,5,9,13, etc. and below the upper MD threads 3,7,11,15.
  • the stitching thread I1 runs in the repeat unit over the upper MD threads 3, 7 and under the upper MD thread 5.
  • the stitching thread 12 runs in the repeat unit over the upper MD threads 11,15 and under the upper MD thread 13th
  • the weaving of the stitching thread 11 with the upper MD threads 3,5,7 forms a first segment A. Furthermore, the weaving of the stitching thread 12 with the upper MD threads 11,13,15 forms a second segment B.
  • the first and second segments are alternately successively in the CD direction, i. in this order, the weave structure formed by the upper MD yarns 1,3,3,7,11,13,15 and the upper CD yarn T1 is continued.
  • the paper-side weave structure is a plain weave pattern.
  • the machine-side weave structure is formed by the lower MD threads 2,4,6,8,10,12,14,16 are interwoven with the lower CD threads B1, B2, B3, .... B8.
  • the lower CD thread B1 runs over the lower MD thread 2 and then under the seven mutually adjacent MD threads 4, 6, 8, 10, 12, 14 and 16.
  • the course of the CD thread B1 over the MD Thread 2 defines a lower attachment point I.
  • the lower attachment points will be discussed later.
  • machine-side weave structure forms an 8 shaft "Atlas weave pattern”.
  • the paper-side and the machine-side weave structures are connected to each other, in which the lower MD threads 2,4,6,8,10,12,14,16 with the first and second stitching threads 11 and I2, I3 and I4, I5 and I6, I7 and I8 of each pair are interwoven.
  • the stitching thread 11 runs under the lower MD threads 12 and 14 in each repeat unit.
  • the stitching thread 21 runs under the lower MD threads 4 and 6 in each repeat unit.
  • the weaving of the stitching thread 11 with the lower MD threads 12 and 14 forms a first binding region OO. Furthermore, the weaving of the stitching thread 12 with the lower MD threads 4 and 6 forms a second binding region XX.
  • each first binding region OO and each second binding region XX is formed by passing the first stitching thread I1 and the second stitching thread 12 respectively under two lower machine direction threads adjacent to each other.
  • the first and second binding regions are alternately successively in the CD direction, i. arranged in the order XX, OO.
  • the two lower MD threads 8 and 10 are arranged.
  • first segment A formed at 3,5,7) and the first binding portion OO (formed at 12,14) is disposed a first transition region in which the first stitching yarn I1 extends between the pair of upper and lower machine direction yarns 9 and 10 ,
  • the forming fabric of the invention FIG. 1 has a CD thread ratio of 1: 1.
  • two lower cross machine direction yarns and one upper cross machine direction yarn are always interposed between two mutually adjacent pairs of first and second stitching yarns.
  • the lower CD threads B2 and B3 and the upper CD thread T2 are arranged. Since each pair of stitching threads continues the weave pattern of an upper CD thread, this results in a CD thread ratio of 1: 1.
  • the pair of stitching threads I1 and I2 between the two upper cross-machine direction yarns T 1 and T2 is arranged. Further, the pair of stitching yarns I1 and I2 are arranged between the two lower cross-machine direction yarns B1 and B2.
  • the lower attachment point I is determined by the course of the lower CD thread B1 over the MD thread 2. Furthermore, the lower attachment points K are determined by the course of the lower CD thread B2 over the MD thread 8.
  • a bottom tie is generally defined by passing a bottom cross machine direction yarn under a first bottom machine direction yarn and over a second machine direction lower yarn adjacent thereto. That
  • the first lower MD threads are formed by the MD threads 4, 16 (for B1) and 6, 10 (for B2), the second lower MD threads being formed by the lower MD thread 2 (FIG. for B1) and 8 (for B2).
  • the lower MD thread 2 is arranged immediately adjacent to the lower MD thread 4 of the second binding region XX.
  • FIG. 2 shows for second repeat units, the arrangement of the binding sites and the binding areas of the weave pattern of the machine side of the embodiment of FIG. 1 ,
  • Each field represents the area in which the lower MD threads 2, 4, 6, 8, 10,... 32 (1 to 16 first repeat unit and 17 to 32 second repeat unit) are connected to the lower CD threads B1 , B2, B3, ... B8 and the first stitching threads I1, I3, I5, .. and the second stitching threads I2, I4, I6, ... are interwoven.
  • locations designated XX represent second bond areas and the locations labeled OO are first bond areas, some of which correspond to the FIG. 1 Marked are.
  • the places marked with ⁇ indicate lower connection points.
  • FIG. 2a Fig. 12 shows the arrangement of the binding sites as well as the bonding regions of the weave pattern of the machine side in the case where the first and second stitching yarns of the pairs of stitching yarns are interposed between two lower cross-machine direction yarns.
  • the stitching threads I1 and I2 are arranged between the lower CD threads B1 and B2. Furthermore, the stitching threads 13 and 14 are arranged between the lower CD threads B3 and B4.
  • FIG. 2b shows the arrangement of the binding sites as well as the binding areas of the weave pattern of the machine side for the case in which between the first and the second stitching threads of the pairs of stitching threads respectively a lower CD thread is arranged.
  • the two lower CD threads B1 and B2 are arranged between the stitching thread I1.
  • the two lower CD threads B2 and B3 are arranged between the stitching thread 12 .
  • FIG. 3 two repeat units of the weave pattern of a second embodiment of the invention in CD direction with a DC thread ratio of 3: 2.

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  • Paper (AREA)
  • Woven Fabrics (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Medicinal Preparation (AREA)
EP05102771A 2004-04-16 2005-04-08 Formiersieb Active EP1586696B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004019182A DE102004019182A1 (de) 2004-04-16 2004-04-16 Formiersieb
DE102004019182 2004-04-16

Publications (2)

Publication Number Publication Date
EP1586696A1 EP1586696A1 (de) 2005-10-19
EP1586696B1 true EP1586696B1 (de) 2008-11-26

Family

ID=34939194

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05102771A Active EP1586696B1 (de) 2004-04-16 2005-04-08 Formiersieb

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EP (1) EP1586696B1 (es)
AT (1) ATE415515T1 (es)
DE (2) DE102004019182A1 (es)
ES (1) ES2318420T3 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2314762A1 (en) 2009-10-23 2011-04-27 Heimbach GmbH & Co.KG Woven paper maker fabric

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101908146B1 (ko) 2011-04-11 2018-12-10 닛폰 휘루콘 가부시키가이샤 부직포용 다층직물

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5437315A (en) * 1994-03-09 1995-08-01 Huyck Licensco, Inc. Multilayer forming fabric
US5967195A (en) * 1997-08-01 1999-10-19 Weavexx Corporation Multi-layer forming fabric with stitching yarn pairs integrated into papermaking surface
GB0317248D0 (en) * 2003-07-24 2003-08-27 Voith Fabrics Gmbh & Co Kg Fabric

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2314762A1 (en) 2009-10-23 2011-04-27 Heimbach GmbH & Co.KG Woven paper maker fabric

Also Published As

Publication number Publication date
DE102004019182A1 (de) 2005-11-10
EP1586696A1 (de) 2005-10-19
ES2318420T3 (es) 2009-05-01
DE502005006039D1 (de) 2009-01-08
ATE415515T1 (de) 2008-12-15

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