WO2015024720A1 - Habillage et procédé pour sa fabrication - Google Patents

Habillage et procédé pour sa fabrication Download PDF

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Publication number
WO2015024720A1
WO2015024720A1 PCT/EP2014/065668 EP2014065668W WO2015024720A1 WO 2015024720 A1 WO2015024720 A1 WO 2015024720A1 EP 2014065668 W EP2014065668 W EP 2014065668W WO 2015024720 A1 WO2015024720 A1 WO 2015024720A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
machine direction
cmd
layers
end edges
Prior art date
Application number
PCT/EP2014/065668
Other languages
German (de)
English (en)
Inventor
Johan MALMQUIST
Kjell Karlsson
Conny Andersson
Original Assignee
Voith Patent Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voith Patent Gmbh filed Critical Voith Patent Gmbh
Publication of WO2015024720A1 publication Critical patent/WO2015024720A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/083—Multi-layer felts
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/10—Seams thereof

Definitions

  • the invention relates to a fabric for use in a machine for producing a fibrous web such as a paper, board or tissue web according to the preamble of claim 1 and of a method for producing such a fabric according to the preamble of claim 17.
  • Fabrics are found in a variety of shapes in a paper machine. Depending on the position, the clothing is assigned different tasks, which, in addition to the support and guidance of the paper web, serve in particular for drainage. The amount of water present in the paper web as it passes through the machine to a decreasing extent must be adequately dissipated without damaging the paper web or marking it by mechanical or hydraulic processes during drainage.
  • the gentle drainage is of central importance, since here already the course for the smoothing of the paper web are made.
  • the paper web is not yet dry enough to pass freely through the machine, but is usually fed and pressed depending on the constellation on at least one or between two felts. Accordingly, the demands on corresponding press felts in terms of surface quality, water absorption and recovery ability, rewetting tendency and permeability to air and water are very high.
  • Press felts today commonly have a load-bearing basic structure, optionally one or more additional layers for reinforcing or improving the abovementioned properties, and one or more layers of staple fibers.
  • the latter represent a bottleneck in production since the staple fiber layers
  • they can be numerous and, on the other hand, go through a multi-stage and sometimes labor-intensive manufacturing process before they are linked to the basic structure.
  • This connection takes place via needling, in which a needle matrix acts on the staple fiber layer resting on the basic structure and pulls the individual fibers into and through the basic structure, thereby permitting a firm connection between the basic structure and staple fiber layers.
  • the reinforcement layer can not be used alone, since it does not provide enough stability, but only in conjunction with a basic structure.
  • the yarns are not crimped or corrugated, so that a dissolution of the structure during use of the fabric is to be feared.
  • EP1209283B1 a covering is known, which seen in the transverse direction has a plurality of longitudinally extending parallel to each other and juxtaposed partial webs whose side edges are connected by connecting means. Adjacent side edges have a meandering course with alternating projections and recesses. The partial webs are interlocked via the projections and recesses.
  • a disadvantage of this prior art is the complex production, which requires many steps. Furthermore, the durability of the connections is questionable if only a small projection is available on a long edge. Several projections are in turn associated with increased manufacturing costs of the individual panels. In general, it is difficult to produce a seam that works without marks and with sufficient stability.
  • the structure of the above-mentioned clothing has seams or connections in several directions, Machine direction and cross machine direction - on, which increases the marking tendency even more. The crossing points of the seams represent particular weaknesses, both in terms of stability and in terms of marking tendency.
  • contiguous leading edges of the fabrics of one of the two plies are arranged in the machine direction between the end edges of the sheets of the other of the two plies and the end edges of fabrics arranged side by side in the cross-machine direction are offset from one another in the machine direction. It can thus be ensured that in each point of the covering a layer has an undisturbed structure which supports a joint between other layers, and this in each of the dimensions present in the clothing (machine direction, cross machine direction, thickness direction).
  • the fabric is thus stable and is still very easy to produce, since it is manufactured modular, so that can be largely dispensed equipment in full clothing width. This affects especially in the field of needle machines, which work with increasing clothing width both considerably more maintenance-intensive and time-consuming.
  • the inventive method for producing the above-mentioned covering provides that the following method steps are implemented: i) providing basic structure sections, ii) connecting one or more basic structural sections to end edges such that a closed loop is created in the length of the fabric to be manufactured iii) covering the loop with at least one layer of staple fiber on at least one surface, iv) needling the at least one staple fiber layer with the loop, v) juxtaposing a plurality of loops in a first layer in a cross machine direction to a desired width of the fabric, vi) arranging further Looping in a second ply disposed on the first ply, and vii) joining the two plies.
  • the end edges of the cross-machine direction juxtaposed fabrics can be steppedly offset from each other at equal or different distances. This can ensure that at least one layer of the basic structure has an undisturbed structure at each point of the covering and can reliably absorb the load during operation of the covering.
  • the end edges of the adjacent cross-machine direction in the cross-machine direction can be alternately offset by an equal or different distance from each other seen in the cross-machine direction.
  • the front edges of the side by side arranged in the cross-machine direction sheet in the cross-machine direction can be staggered stepwise and again emigrated staggered against each other.
  • end edges of one or more in the circumferential direction of the fabric adjoining sheets of the respective layer may be connected together to form a closed loop.
  • the sheets of the first layer may comprise machine direction oriented longitudinal edges and the second layer sheets may have machine direction oriented longitudinal edges, adjacent longitudinal edges of two adjacent sheets of one of the two layers between the longitudinal edges of a sheet of the other of the two layers are arranged.
  • an overlap between the fabrics of one layer relative to the other layer in the cross machine direction can be between 10% and 90%, preferably between 30% and 70%, particularly preferably 50%.
  • According to advantageous embodiments may marginally be present in an area in which only one of the layers is formed or alternatively, that a not occupied by the second layer occupied area auxiliary structure is provided, which complements the respective shorter position to full width in the cross machine direction.
  • end edges and / or the longitudinal edges of adjoining sheets may be joined together by ultrasonic welding, laser welding, high frequency welding, thermal welding, in particular using a monofilament, bonding, in particular using hot melt adhesives, filling with a resin or needling.
  • each of the sheets may comprise at least one layer of load-bearing base structure and at least one layer of staple fibers.
  • several juxtaposed fabrics may be provided with a common staple fiber layer.
  • the at least one layer of staple fibers may be disposed on one or both sides of the base structure.
  • a plurality of staple fiber layers may be provided which have the same or different basis weights and / or different fiber strengths.
  • the at least one layer of staple fibers may be needled to the basic structure.
  • the basic structure may advantageously be selected from: woven, scrim, knitted, spiral, ribbon.
  • the one or more functional layers can be selected from: films, films, woven fabrics, scrims, knitted fabrics, knitted fabrics, nonwovens.
  • the method may comprise applying at least one further staple fiber layer to and needling with the covering consisting of at least two layers.
  • FIG. 2 shows a schematic illustration of a second embodiment of a clothing according to the invention in a plan view
  • FIG. 3 shows a schematic representation of a third embodiment of a clothing according to the invention in a plan view.
  • the fabric 1 shows a schematic representation of a string 1 designed as an endless belt.
  • the direction in which the endless belt is self-contained corresponds to the later running direction or machine direction and is referred to below as MD; the direction across is referred to as Machine Quenching or CMD.
  • the fabric 1 has a paper-side surface 3, on which the pulp suspension or the resulting fibrous web at according to the intended use of the covering 1 rests.
  • the paper-side surface 3 of the fabric 1 is the outwardly directed surface of the fabric.
  • the inwardly directed surface facing the volume enclosed by the covering 1 is referred to as the running side 4 in this document. It is applied to the rollers not shown in the figures, which cause the circulation of the fabric 1.
  • the covering 1 comprises at least two layers arranged on top of each other, a first layer L1 and a second layer L2.
  • the two layers L1, L2 can be connected to one another by suitable measures, as will be described in more detail below.
  • the layers L1, L2 are composed of individual sheets 2, which have a length and a width, wherein the length is greater or substantially greater than the width.
  • the thickness of the sheet 2 is substantially less than its length and width.
  • the width of the fabric 2 can be between 0.3 and 3m.
  • the fabrics 2 have longitudinal edges K1 (associated with the layer L1), K2 (associated with the layer L2) and end edges S1 (associated with the layer L1) S2 (belonging to the layer L2) oriented in the machine direction MD.
  • the end edges S1, S2 of each sheet 2 of each layer L1, L2 each point to each other, wherein hereby formed joints of the first layer L1 according to the invention with respect to the machine direction MD offset to joints formed in the same way in the same position L1 and / or in the second layer L2 are arranged to reduce the mechanical stress of the individual joints in the operational use of the fabric 1.
  • the joints are each shown as a double line to illustrate the contiguity of the end edges S1, S2 of each sheet 2 each layer L1, L2.
  • this representation is not intended to suggest that at the end edges S1, S2 a gap is formed between the ends. Rather, the end edges S1, S2 abut each other directly and are interconnected in more detail below.
  • Each of the layers L1, L2 may be formed by one or more fabrics 2, which extend over a partial width or over the entire width of the fabric 1 and over a partial length or over the entire length of the fabric 1.
  • the fabrics 2 may be integrally formed in the machine direction MD, so that the end edges S1, S2 of the same sheet 2 abut and this forms a closed loop, or of two or more in the circumferential direction of the fabric 1 adjoining sheets. 2 , which together form a closed loop.
  • the fabrics 2 occupy the entire width or a partial width, wherein the fabrics 2 adjacent to each other at longitudinal edges K1, K2. Both the joints of the individual sheets 2 formed from the longitudinal edges K1, K2 and also from the end edges S1, S2 are offset relative to one another according to the invention. This can be embodied in different forms, as explained in more detail with reference to the following exemplary embodiments.
  • the joints should be arranged offset from one another in the machine direction MD.
  • the offset may be continuously stepped by an equal or different offset as shown in FIG. 1 or alternately by an equal or different offset as illustrated in FIG. 2.
  • a stepwise in-machine direction MD and then emigrated staggered arrangement as shown in Fig. 3 is possible.
  • the lateral offset in the machine direction MD of the fabrics 2 is preferably between 5 and 95% of the lengths of the fabrics 2.
  • a possible and preferred design of the offsets may provide that the length of the fabric 1 in terms of degrees is 360 ° and the offsets are selected are that the offset (360 number of sheets in CD) is such that the offsets are evenly distributed in the circumferential direction.
  • the offset of the longitudinal edges K1, K2 of the fabrics 2 oriented in the machine direction MD in the cross machine direction CMD can be between 10% and 90%, preferably between 30% and 70%, particularly preferably 50%. It is in any case to ensure that there is enough overlap between the fabrics 2 of the first layer L1 and the fabrics 2 of the second layer L2, which is most likely in the case of 50% overlap. If the width of the fabric 2 corresponds to the width of the fabric 1 to be produced therefrom, then no offset between the fabrics 2 of the layers L1 and L2 is required. In marginal areas, the fabric 1 can only consist of one of the layers L1, L2, since the overlap in the cross-machine direction can allow an offset of up to 90%. Since there is no paper web, this is not the operation of the fabric 1 hinder. Alternatively, consideration may be given to the use of an auxiliary strip, made in the appropriate width corresponding to the missing part of the overlap, to abut the edges of the fabric in the two plies L1, L2.
  • Fabric used as press felts 1 usually have a structure which has a basic structure, for example in the form of a fabric or other suitable load-bearing structure and at least one staple fiber layer formed thereon.
  • Such press felts have long been known in their basic structure, which is why a detailed description can be dispensed with at this point.
  • the at least one Staple fiber layer is bonded to the base structure by a so-called needling process, with a plurality of needles passing through the staple fiber layer and the base structure, thereby pulling the fibers of the at least one staple fiber layer into the base structure and anchoring therein.
  • the fabrics 2 are assembled in their predetermined dimension of the basic structure according to the invention.
  • the basic structural parts are processed into strips by laying at least one or more of the basic structural parts against each other until the desired length of the covering 1 is reached, and then made endless by joining at the end edges S1, S2. If the length of the basic structure part corresponds to the length of the covering 1, then only one joint has to be connected. If the closed loop composed of several sections, correspondingly more joints are present, which are connected to each other. Subsequently, the closed loops are provided with at least one staple fiber layer, which is needled with the basic structure.
  • the closed loops are arranged side by side to the planned width of the fabric 1 and one above the other in at least two layers L1, L2.
  • the staple fiber layer of the paper side 3 to the outside, while the staple fiber layer of the running side 4 points inwards.
  • further layers which are not shown in the figures, can be arranged. It is possible to combine one or more staple fiber layers, even of different fiber thicknesses, and to need to need to be needled individually or together.
  • the at least one staple fiber layer extends over the width of a plurality of sheets and is needled therewith, not only each with a sheet.
  • the fabrics 2 of the two layers L1, L2 are, as described above, arranged overlapping each other, so that the edges K1 of the fabrics 2 of a layer L1 come to lie between each edge K2 of the fabric 2 of the second layer L2.
  • the fabric 1 is another step of Needling subjected.
  • the existing staple fiber layers can be needled again by penetrating both layers L1, L2, but it is also possible to apply even more additional staple fiber layers.
  • the advantage of this approach is the fact that small-sized needle machines can be used that work in strips, and it is not necessary to provide needle machines for the full width of the fabric 1, the expensive and expensive both in the purchase and in space and are in operation.
  • connection of two fabrics 2 can be made both along the end edges S1, S2, as well as along the longitudinal edges K1, K2 by ultrasonic welding, high-frequency welding, laser treatment, thermal welding or bonding, in particular using hot melt adhesives. Furthermore, it is possible to weld the joints using a monofilament or to fill with a resin.
  • connection at the abutment points does not take place cohesively as in the abovementioned methods, but only takes place by needling after the structure of the covering 1 from the fabrics 2.
  • the adhesion between the layers L1, L2 is so strong by the penetration of the fibers of the staple fiber layers that the fabric 1 is not pulled apart even under tensile load.
  • the clothing 1 may have further layers.
  • a polymeric functional layer cover the layers L1, L2.
  • Such functional layers can serve, for example, to cover the joints or to influence the functionality of the fabric 1 with regard to water absorption and water release capacity, rewetting behavior, abrasion resistance and recovery behavior.
  • a smooth paper-side surface of the fabric 1 can be ensured if the fabrics 2 are possibly not joined together at the joints, as described above. Since the functional layers do not have to absorb tensile stresses, the material can This situation can be selected with a view to optimizing the above-mentioned properties.
  • the running side 4 can be provided to reduce the abrasion occurring during the passage of the various machine elements abrasion-reducing additives, whereby a higher mileage of the fabric 1 can be achieved.
  • the covering 1 undergoes no shrinkage during operation, which is to be understood as a shortening of the circumferential length and width of the fabric 1 by thermal action, the fabric 1 can be finally heat-set.

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  • Nonwoven Fabrics (AREA)

Abstract

L'invention concerne un habillage (1), en particulier un feutre pour la section des presses destiné à être utilisé dans une section des presses d'une machine permettant de produire une bande fibreuse telle qu'une bande de papier, de carton ou de tissu. Cet habillage est constitué de plusieurs structures planes textiles (2), lesquelles structures planes (2) sont superposées en au moins deux couches (L1, L2). Chaque couche (L1, L2) est formée respectivement par au moins une, de préférence plusieurs structures planes (2), disposées les unes à côté des autres dans un sens travers (CMD) et/ou les unes derrière les autres et contigües dans un sens machine (MD), ces structures définissant conjointement une longueur et une largeur de l'habillage (1) dans le sens machine (MD) et dans un sens travers (CMD). Les structures planes (2) de la première couche (L1) présentent deux bords frontaux (S1) orientés dans le sens travers (CMD) et les structures planes (2) de la deuxième couche (L2) présentent deux bords frontaux (S2) orientés dans le sens travers (CMD), les bords frontaux (S1, S2) contigus des structures planes (2) d'une des deux couches (L1, L2), vus dans le sens machine (MD), étant disposés entre les bords frontaux (S2, S1) des structures planes (2) de l'autre couche (L2, L1) et les bords frontaux (S1, S2) des structures planes (2) juxtaposées dans le sens travers (CMD), vus dans le sens machine (MD), étant décalés les uns des autres.
PCT/EP2014/065668 2013-08-23 2014-07-22 Habillage et procédé pour sa fabrication WO2015024720A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013216739.3 2013-08-23
DE102013216739 2013-08-23

Publications (1)

Publication Number Publication Date
WO2015024720A1 true WO2015024720A1 (fr) 2015-02-26

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PCT/EP2014/065668 WO2015024720A1 (fr) 2013-08-23 2014-07-22 Habillage et procédé pour sa fabrication

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5864931A (en) * 1991-05-23 1999-02-02 Thomas Josef Heimbach Gmbh & Co. Felt, in particular a papermaking-machine felt, and method for its manufacture
US5879777A (en) * 1997-06-19 1999-03-09 Asten, Inc. Modular papermaking fabric
EP1378602A1 (fr) * 2002-07-04 2004-01-07 Ichikawa Co.,Ltd. Feutre de presse pour machine à papier

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5864931A (en) * 1991-05-23 1999-02-02 Thomas Josef Heimbach Gmbh & Co. Felt, in particular a papermaking-machine felt, and method for its manufacture
US5879777A (en) * 1997-06-19 1999-03-09 Asten, Inc. Modular papermaking fabric
EP1378602A1 (fr) * 2002-07-04 2004-01-07 Ichikawa Co.,Ltd. Feutre de presse pour machine à papier

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