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EP3604670A1 - Dispositif de drainage d'une bande de non-tissé obtenu par voie humide - Google Patents

Dispositif de drainage d'une bande de non-tissé obtenu par voie humide Download PDF

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Publication number
EP3604670A1
EP3604670A1 EP19175503.2A EP19175503A EP3604670A1 EP 3604670 A1 EP3604670 A1 EP 3604670A1 EP 19175503 A EP19175503 A EP 19175503A EP 3604670 A1 EP3604670 A1 EP 3604670A1
Authority
EP
European Patent Office
Prior art keywords
drainage
format
drainage gap
fibers
gap
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.)
Granted
Application number
EP19175503.2A
Other languages
German (de)
English (en)
Other versions
EP3604670B1 (fr
Inventor
Ralf Schröder
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
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 EP3604670A1 publication Critical patent/EP3604670A1/fr
Application granted granted Critical
Publication of EP3604670B1 publication Critical patent/EP3604670B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D21F1/48—Suction apparatus
    • D21F1/483—Drainage foils and bars
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0272—Wet presses in combination with suction or blowing devices
    • 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

Definitions

  • the invention relates to a device for producing a wet-laid nonwoven. Furthermore, the invention relates to the use of such and a machine comprising such a device.
  • the nonwoven web is usually carried out by a wet laying process on a inclined screen former with a very low consistency of the fiber suspension, in particular with a solids content of 0.01 to 0.1% by weight based on 100% by weight of the nonwoven obtained.
  • edge edgers In addition, other resources, such as compressed air or spray water, are required for edge edgers, which had to be kept available and supplied to it. In the case of the known edge seamers or format plates, there was also hydraulic swirling of the fiber suspension around the edge seamers. This resulted in an unwanted basis weight deviation at the edges of the finished nonwoven.
  • the present invention relates to the generic objects mentioned at the outset.
  • the present invention has for its object to provide a device for dewatering a wet-laid nonwoven web from a fiber suspension, by means of which the aforementioned problems can be eliminated in the simplest and most reliable way possible.
  • a device is to be specified on which the width of the nonwoven web (s) to be produced can be set more easily and which provide clean edges of the nonwoven web (s).
  • the invention relates to the use of such and a machine comprising such a device.
  • the width of the nonwoven web to be produced can be varied - even during the intended operation of the machine in which the nonwoven web is manufactured.
  • two or more (particularly narrow) nonwoven webs can be produced side by side on the dewatering device.
  • several nonwoven webs can be produced on the same device, that is to say from the same pulp suspension emerging from the headbox.
  • the sliding format slides thus act as a divider for the fiber suspension emerging from the headbox.
  • any format width that is equal to or less than the format width of the former can be set.
  • a fiber suspension in the sense of the invention means a mixture of a liquid - such as water - and fibers.
  • a nonwoven web in the sense of the invention is a scrim made of a fiber suspension or knitted fabric of fibers of limited length, e.g. To understand continuous fibers (filaments) or from cut yarns.
  • the nonwoven web initially has such a low strength that it itself is not load-bearing.
  • it is a wet-laid, ie a hydraulically (also: hydrodynamically) formed nonwoven.
  • the nonwoven web can finally be solidified to form the nonwoven.
  • Such a nonwoven is considered to be finally consolidated if it essentially has such a high strength as a result of the consolidation that it is suitable for the intended use, e.g. for its further processing into corresponding products such as hygiene articles.
  • the nonwoven web can be consolidated in the forming section after it has been produced.
  • This can be done by a binder that is applied to the dewatered nonwoven web or by hydraulic consolidation, e.g. using water jets.
  • a (final) consolidation can also be a combination of (also multi-stage) water jet consolidation - that is to say a hydraulic consolidation process - and an additional impregnation by means of a binder - that is to say a chemical consolidation process.
  • the nonwoven web can be dried.
  • a subsequent mechanical consolidation for example by means of a needle machine, can optionally further increase the strength of the nonwoven web.
  • Binding agents are agents that bond the fibers to one another so that, for example, there is a firm bond between the fibers.
  • the term binders includes chemical binders which are applied, for example, in liquid form to the nonwoven web or mixed into the fiber suspension. They bond the fibers to each other by adhesion.
  • water jet consolidation or water jet needling is a hydraulic consolidation process for producing a firm bond between the fibers of a nonwoven. This entangles the fibers and thus the densification and consolidation of the fleece by swirling by z. B. act focused high pressure water jets on the nonwoven web.
  • the nonwoven web is hydraulically consolidated on the forming fabric - and preferably there finally - then the total length of the device for producing a nonwoven web can be considerably reduced in the running direction of the nonwoven web to be produced.
  • the consolidated nonwoven web In order to dry the consolidated nonwoven web quickly and effectively, it can be mechanically, e.g. by means of a press, by means of a vacuum extraction or thermally by means of a dryer (e.g. with through-flow drying technology, then called through-flow dryer).
  • a dryer e.g. with through-flow drying technology, then called through-flow dryer.
  • Nonwoven fabrics within the meaning of the invention do not include fiber structures produced by crossing or intertwining yarns, as is the case with weaving, knitting, knitting, lace manufacture, braiding and the manufacture of tufted products. Films and papers are also not among the nonwovens.
  • Nonwovens according to the invention can preferably be produced from glass, metal, mineral, ceramic or carbon fibers.
  • Such fibers can be glass fibers but also plastic fibers such as aramid fibers, but also mineral fibers such as basalt fibers.
  • metallic fibers for example steel, stainless steel or titanium fibers can be considered.
  • the materials mentioned often have an elastic modulus of at least 10 GPa. They are then comparatively hard, brittle and rigid and can not do well devour and tangle with each other. It is therefore particularly advantageous if, in addition to the fibers, binding fibers that are less rigid are used.
  • a former such as an inclined screen former in the sense of the invention, is assigned a forming screen which at least in sections - e.g. along a first section - at an angle to the horizontal.
  • At least one headbox is then arranged in this section of the route in such a way that it applies the fibrous stock suspension to the top of the forming fabric.
  • the top means that the fiber suspension is applied to the top of the forming fabric. This is the side that, on the one hand, faces away from the rollers on which it rotates and, on the other hand, faces the headbox outlet.
  • On the underside that is to say in the area of the underside of the forming fabric, at least one dewatering element can be arranged for dewatering the fiber suspension just applied.
  • the mentioned drainage element can be the device according to the invention.
  • the headbox can in turn be assigned to the inclined screen former.
  • the inclined screen former is arranged in such a way that the first route section rises in the direction of the deposited nonwoven web at an angle to a horizontal plane.
  • Forming sieve and / or support sieve are usually as endless, e.g. Closed loops running on rollers. They can be set up in such a way that the nonwoven web can be needled on the same water jet. This means that the corresponding forming screen and / or support screen is permeable to water so that the water jets can pass through it.
  • the decomposition temperature is the temperature at which the material of the fibers decomposes chemically or thermally.
  • the decomposition temperature is characteristic, for example, of materials that do not melt, such as thermosets.
  • the melting temperature is the temperature at which the material, for example the fiber, passes from the solid state into the melt.
  • the present invention also relates to the use thereof for producing a nonwoven fabric which has industrially produced long fibers and preferably inorganic fibers or fibers made from synthetically produced polymers and preferably whose fibers have a decomposition or melting temperature of at least 300 ° C. Glass fibers are an example of such fibers.
  • Long fibers are fibers with a length of 6 to 38 mm. The invention is fundamentally suitable for all fiber lengths, ie not just long fibers.
  • the present invention relates to a machine for producing a wet-laid nonwoven web, comprising a former, such as an inclined screen former, a forming fabric assigned to the former for producing the nonwoven web by laying down the fibers of the fibrous suspension on the forming fabric with the device for dewatering according to the invention, which is preferably below the forming fabric is arranged.
  • a former such as an inclined screen former
  • the present invention also relates to the product produced directly by means of the method according to the invention, that is to say the nonwoven fabric itself.
  • Fig. 1 is a part of a machine according to the invention for producing a wet-laid nonwoven web in a side view schematically and therefore not shown to scale.
  • the device comprises a former, in the present case in the form of an inclined screen former 1.
  • This is assigned an endless forming wire 2, which rotates here on rollers. The latter rotates relative to the fixed inclined wire former 1.
  • a headbox 1.1 is arranged above the forming wire 2, a headbox 1.1 is arranged.
  • the latter is assigned to the inclined screen former 1.
  • a fibrous stock suspension can be fed to the headbox 1.1 and can be applied to the forming fabric 2, more precisely on the top side thereof, via an outlet of the headbox 1.1.
  • the fibrous suspension usually has a fibrous suspension, such as a water-fiber mixture.
  • the forming fabric 2 is designed so that it lets the water through.
  • the device 1.2 according to the invention also referred to as a drainage box, for removing the liquid (here the water) of the fiber suspension is arranged.
  • the device for drainage 1.2 is assigned to the inclined screen former 1 of the machine.
  • the fibrous suspension passes through the outlet of the headbox 1.1 to the forming screen 2, which moves relatively past the headbox 1.1 or the dewatering device 1.2 via the rollers.
  • the water flows through the forming screen 2 into the dewatering device 1.2.
  • the fibers from the fiber suspension get caught on the forming wire 2 and are transported further with it. In this way, a corresponding nonwoven web F is continuously deposited or formed on the forming wire 2.
  • the forming fabric 2 is - seen in its running direction or in the running direction of the nonwoven web V - in a first section, inclined upwards against the horizontal.
  • the inclined screen former 1 is in this first section arranged, ie the nonwoven web V is formed on this section.
  • the first section is delimited by the upper rollers, which follow one another in the running direction of the support screen 3. For this purpose, at least two such upper rollers are provided. In the illustration shown, the forming screen 2 rotating in the present clockwise direction thus rises from the bottom left to the top right in the said first route section.
  • the nonwoven web V is guided past its formation on the forming fabric 2 for its hydraulic consolidation under the consolidation device 4.
  • the latter is assigned a multiplicity of water jet nozzles 4.1, which here above the forming fabric 2 and an outlet 4.2 for water, which lies below the forming fabric 2.
  • the forming wire 2 runs horizontally or at least in sections essentially parallel to the horizontal plane in the area in which the water steel nozzles 4.1 and the outlet 4.2 are arranged.
  • the nonwoven web V is finally consolidated on the forming fabric 2.
  • a binder section of the machine directly adjoins the forming section in the present case.
  • This comprises an application device 7, which is arranged above a support screen 3 running horizontally or at least in sections essentially parallel to the horizontal plane.
  • the finally hydraulically consolidated nonwoven web V can be impregnated with a chemical binder by means of the application device 7.
  • a thermal drying device for example, can directly adjoin the binder section in order to dry the nonwoven web V provided with a binder (not shown).
  • a pre-consolidation device 6 can be connected upstream of the hydraulic consolidation device 4 in the running direction of the nonwoven web to be produced.
  • it can be analogous to the hydraulic consolidation device 4 be set up, but be operated at a lower pressure than the solidification device 4, which is, for example, only 5 to 25 bar.
  • the respective consolidation device 4, however, can be operated at a pressure of 15 to 400 bar.
  • the consolidation by means of the consolidation device 4 does not necessarily have to, as in Fig. 1 shown, take place on the forming fabric 2. It can also take place on a further part of the machine which adjoins the former in the running direction of the nonwoven web V, for example on the support screen 3.
  • the Fig. 2 and 3 each show an embodiment of the invention in a partially cut, unscaled top view of the device for drainage 1.2, namely in the direction in which the liquid of the fiber suspension from the headbox 1.1 ( Fig. 1 ) flows.
  • the longitudinal or symmetry axis L shown corresponds at the same time to the running direction of the machine, that is to say the direction in which the nonwoven web is made Fig.1 is transported inside the machine.
  • the device for drainage 1.2 that is to say the drainage box, comprises a plurality of drainage strips 1.3 arranged at a distance from one another. The latter are longer than they are wide. Their longitudinal extent runs in the representation of the Fig. 2 and 3 thus at right angles to the longitudinal or symmetry axis L.
  • Two directly adjacent drainage strips 1.3 together form a drainage gap 1.5 with one another. This serves to remove the liquid from the fiber suspension, which passes through the forming wire 2 ( Fig. 1 ) passes through the device 1.2.
  • the drainage gaps 1.5 can be connected to a discharge line, not shown, in order to discharge the liquid.
  • each drainage gap 1.5 shown should cover the drainage gap 1.5 locally. They can be arranged so that they extend into the drainage gap 1.5.
  • the purpose of the format slide 1.4 is to prevent local drainage through the device 1.2.
  • the Format slides 1.4 "shaded" areas of the respective drainage gap 1.5 are placed on top of the forming screen 2 ( Fig. 1 ) no fibers are deposited, ie no nonwoven web V is generated locally.
  • the longitudinal extension of the format slide 1.4 is only a fraction of the longitudinal extension of the respective drainage gap 1.5.
  • the format slide 1.4 can be designed so that it can be detachably connected to the device 1.2, e.g. can be connected to the drainage strips 1.3. This means that e.g. are captively detectable by positive and / or non-positive connection on the device 1.2, e.g. to which at least one of the two adjacent drainage strips 1.3 can be clamped. However, this connection can also be released.
  • a variable adjustment of the format slide 1.4 within the one drainage gap 1.5 relative to one another can thus be achieved.
  • the spacing of the format slide 1.4 within the one drainage gap 1.5 can be adjusted as desired. This can e.g. by axial displacement - also independently of one another - this can be achieved along the drainage gap 1.5 assigned to them, namely at right angles to the longitudinal or symmetry axis L. As a result, the width of the nonwoven web V to be produced can be adjusted.
  • the respective format slides 1.4 of mutually adjacent drainage gaps 1.5 can be set in the same position to one another.
  • the distances between corresponding format slides 1.4 of mutually adjacent drainage gaps 1.5 can be set equidistantly, so that rows of format slides 1.4 which run parallel to the longitudinal or symmetry axis L result via the device for drainage 1.2.
  • an even number of format slides 1.4 is selected, which are assigned to the same drainage gap 1.5, for example four, then one half of the number, ie two - seen in the longitudinal direction an axial end of the two adjacent drainage strips 1.3 forming the drainage gap 1.5 - and the remaining half of the format slide 1.4 assigned to the opposite axial end of the device for drainage 1.2.
  • the axial ends are related to a longitudinal axis, which in Fig. 2 and 3 corresponds to the longitudinal extent of the drainage strips 1.3, ie a right-angled to the longitudinal and symmetry axis L.
  • the opposing axial ends of the drainage strips 1.3 correspond to the drainage device 1.2 of the drive and the driver side of the machine according to the invention.
  • a possibility of individual adjustment of the spacing of the format slide 1.4 to each other is shown.
  • all slides of a corresponding drainage gap 1.5 have a slide mechanism, by means of which they are preferably mounted continuously, axially displaceably along the drainage gap 1.5.
  • a push rod 1.7 is assigned to the outer format slide, which is in each case closer to the axial end of the drainage strip.
  • the inner format slide which is further away from the axial end of the drainage strip is guided axially displaceably relative to the device in the longitudinal direction of the drainage gap by means of a sleeve 1.6 surrounding the push rod 1.7.
  • the inner format slide can be moved by axially moving the sleeve and the outer format slide can be moved by axially moving the push rod.
  • the respective push rod 1.7 and sleeve 1.6 which are assigned to each individual axially displaceable drainage element, can be driven by hand or via a drive 1.8, such as a linear drive, to adjust them axially.
  • a drive 1.8 such as a linear drive
  • the individual format slides 1.4 can be adjusted as desired, even continuously, and particularly preferably even during operation of the machine for producing the wet-laid nonwoven web.
  • edge edgers and the additional resources required for this such as compressed air or spray water, can be dispensed with.
  • several nonwoven webs can be placed side by side and simultaneously on the same Forming screen can be produced.
  • the finished nonwoven also has a particularly uniform basis weight cross profile.

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  • Paper (AREA)
  • Nonwoven Fabrics (AREA)
EP19175503.2A 2018-08-03 2019-05-21 Dispositif de drainage d'une bande de non-tissé obtenu par voie humide Active EP3604670B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018118884.6A DE102018118884A1 (de) 2018-08-03 2018-08-03 Vorrichtung zur Entwässerung einer nassgelegten Vliesstoffbahn

Publications (2)

Publication Number Publication Date
EP3604670A1 true EP3604670A1 (fr) 2020-02-05
EP3604670B1 EP3604670B1 (fr) 2021-01-06

Family

ID=66625798

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19175503.2A Active EP3604670B1 (fr) 2018-08-03 2019-05-21 Dispositif de drainage d'une bande de non-tissé obtenu par voie humide

Country Status (3)

Country Link
US (1) US11118309B2 (fr)
EP (1) EP3604670B1 (fr)
DE (1) DE102018118884A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113930993B (zh) * 2021-11-09 2023-07-11 浙江华章科技有限公司 一种用于流浆箱的可调节的脱水装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10163575A1 (de) * 2001-12-21 2003-07-03 Voith Paper Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn aus einer Faserstoffsuspension
EP1975314A2 (fr) * 2007-03-31 2008-10-01 Voith Patent GmbH Machine destinée à la fabrication d'une bande de tissu, en particulier d'une machine à fabriquer du papier tissu
DE102016120649A1 (de) * 2016-10-28 2018-05-03 Voith Patent Gmbh Entwässerungsvorrichtung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE757981A (fr) * 1969-11-14 1971-04-01 Neyrpric Bmb Dispositif de controle d'egouttage d'une suspension de particules pour la realisation d'un voile
US5076894A (en) * 1990-05-04 1991-12-31 Simmons Holt W Suction box apparatus with composite cover elements mounted in slots on cross braces
DE29615823U1 (de) * 1996-09-13 1996-10-31 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Saugkasten
DE50209515D1 (de) * 2001-05-15 2007-04-05 Voith Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn aus einer Faserstoffsuspension, Verfahren zur Überwachung eines Entwässerungselements einer Papiermaschine und Papiermaschine mit einem System zur Überwachung eines Entwässerungselements
US6712941B2 (en) * 2002-04-02 2004-03-30 Weavexx Corporation Forming board for papermaking machine with adjustable blades

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10163575A1 (de) * 2001-12-21 2003-07-03 Voith Paper Patent Gmbh Maschine zur Herstellung einer Faserstoffbahn aus einer Faserstoffsuspension
EP1975314A2 (fr) * 2007-03-31 2008-10-01 Voith Patent GmbH Machine destinée à la fabrication d'une bande de tissu, en particulier d'une machine à fabriquer du papier tissu
DE102016120649A1 (de) * 2016-10-28 2018-05-03 Voith Patent Gmbh Entwässerungsvorrichtung

Also Published As

Publication number Publication date
US20200040527A1 (en) 2020-02-06
DE102018118884A1 (de) 2020-02-06
EP3604670B1 (fr) 2021-01-06
US11118309B2 (en) 2021-09-14

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