EP4222310A1 - Dispositif de formation par flux d'air - Google Patents

Dispositif de formation par flux d'air

Info

Publication number
EP4222310A1
EP4222310A1 EP21782701.3A EP21782701A EP4222310A1 EP 4222310 A1 EP4222310 A1 EP 4222310A1 EP 21782701 A EP21782701 A EP 21782701A EP 4222310 A1 EP4222310 A1 EP 4222310A1
Authority
EP
European Patent Office
Prior art keywords
air
laying device
forming fabric
channel
fiber
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.)
Pending
Application number
EP21782701.3A
Other languages
German (de)
English (en)
Inventor
Tobias HENLE
Alexander GLONING
Christian Kneißle
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 EP4222310A1 publication Critical patent/EP4222310A1/fr
Pending legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • D04H1/732—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by fluid current, e.g. air-lay
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/04—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres having existing or potential cohesive properties, e.g. natural fibres, prestretched or fibrillated artificial fibres
    • D04H1/26—Wood pulp
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/04—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres having existing or potential cohesive properties, e.g. natural fibres, prestretched or fibrillated artificial fibres
    • D04H1/28—Regenerated cellulose series

Definitions

  • the invention relates to an air-laying device for producing a fiber mat at least partially from wood pulp fibers and/or cellulose fibers.
  • Devices of this type are known. First, individual fibers or fiber agglomerates are produced and distributed evenly onto a screen by an air stream to form a fiber mat. Air laying units for laboratory use are operated in batch mode. Individual fiber mats, so-called fiber mat sheets, are produced one after the other for further investigation in the laboratory with regard to properties, for example mechanical properties. Such devices work very slowly and have to be filled by hand. The provision of individual fibers due to the breaking up of fiber agglomerates is particularly complex.
  • Air-laying devices are also known which produce webs of fiber mats in continuous operation.
  • the provision of individual fibers is complex due to the breaking up of fiber agglomerates.
  • the known devices also have the disadvantage that aggregates, such as powder, can only be mixed evenly with the fibers in the air flow with difficulty. On the other hand, it is difficult to process fibers with a wide range of fiber lengths.
  • the object of the invention is therefore to specify an air-laying device which improves the known devices with regard to the disadvantages described.
  • An air-laying device for producing a fiber mat from at least partially wood pulp fibers and/or cellulose fibers is proposed, with a ring distributor having a fiber feed, an annular channel with an outlet element forming a section of the annular channel, wherein this section is arranged within a calming channel extending downwards in the direction of a forming fabric and the outlet element has openings through which the fibers supplied by the fiber feed can exit from the annular channel into the calming channel and move up to the forming fabric in order to form the fiber mat on the forming fabric to build.
  • the ring channel of the ring distributor is expediently designed in such a way that the fibers and optionally the fiber agglomerates and additives move in a ring flow generated by an air stream.
  • Some of the fibers and, if present, some of the additives leave the annular channel via the outlet element and go directly into the calming channel and then onto the forming fabric to form a fiber mat or a fiber mat web.
  • the fiber agglomerates are broken up into individual fibers. Before the fibers leave the ring channel, they are preferably transported several times through the ring flow in a circle. The multiple circulations improve the dissolution of fiber agglomerates on the one hand and on the other hand a homogeneous mixture of the solids in the air flow is achieved.
  • Wood pulp fibers and/or cellulose fibers and/or additives are expediently supplied in the air stream by the fiber feed.
  • an air nozzle In the area of the fiber feed, an air nozzle can be used as a propulsion jet nozzle in order to generate a negative pressure in the fiber feed.
  • ⁇ nozzles flow into the ring channel to generate an air flow and to break up fiber agglomerates. This maintains and drives the ring flow and the air jets from the air nozzles generate pressure pulses on the fiber agglomerates so that they are broken up.
  • cleaning nozzles are arranged outside the ring channel for cleaning the openings of the outlet element. These are preferably also designed as air nozzles.
  • the air nozzles and/or cleaning nozzles can be supplied with a pulsating or oscillating air flow.
  • the air nozzles and/or the cleaning nozzles can be fixed or movable. This allows the drive effect of the annular flow to be set on the one hand and the cleaning effect on the other.
  • the movably mounted nozzles can be designed for an oscillating movement.
  • the calming channel can seal off with the forming fabric or be at a distance from the forming fabric.
  • the calming channel can be subjected to an overpressure.
  • a suction device can be assigned to the forming fabric. This supports fiber placement and a more compact fiber mat can be produced.
  • the openings of the outlet element can have a maximum width of 10 mm.
  • the openings can be slit-shaped or round.
  • the ring channel can contain mixed particles for mixing the fibers and for breaking up fiber agglomerates.
  • the air-laying device can be designed as suitable for laboratory use and the forming fabric can be arranged statically. In this case, the feed can be designed to be closable. Thus, the production of a fiber mat can be carried out in batch mode.
  • the air-laying device can also be designed to be suitable for the continuous production of fiber mat webs and the forming fabric can be movable in one running direction. It is preferably designed as a circulating belt guided over a number of rollers.
  • FIG. 1 shows an embodiment of a device according to the invention with a ring distributor in a simplified, schematic representation
  • FIG. 2 shows a side view of the embodiment according to FIG. 1 in a simplified, schematic representation
  • FIG. 1 shows an embodiment of a device according to the invention with a ring distributor 2 in a simplified, schematic representation.
  • the air-laying device 1 is used to produce a fiber mat from at least partially wood pulp fibers and/or cellulose fibers. It has a ring distributor 2 with a ring channel and a fiber feed 10 .
  • the annular channel has a section which is formed by an outlet element 3 with openings through which the fibers fed through the fiber feeder 10 can exit from the annular channel into the stilling channel 4 and move up to the forming fabric 5 in order to form the fiber mat on the forming fabric 5.
  • the outlet element 3 has slit-shaped openings, the dimensions of which are less than 10 mm in width and greater than 10 mm in length.
  • the section with the outlet element 3 is arranged in a calming channel 4 extending downward in the direction of a forming fabric 5 .
  • the ring channel of the ring distributor 2 is suitably designed so that the fibers and, if necessary move the fiber agglomerates and aggregates in an annular flow generated by an air current. Some of the fibers and, if present, some of the additives leave the annular channel via the outlet element 3 and go directly into the calming channel 4 and then onto the forming fabric 5 to form a fiber mat in batch operation or a fiber mat web in continuous operation. In the annular flow, the fiber agglomerates are broken up into individual fibers. Before the fibers leave the ring channel, they are preferably transported several times in a circle by the ring flow.
  • an air nozzle 6 is used as a propulsion jet nozzle in order to generate a negative pressure in the fiber feed 10 in order to facilitate the feeding of wood pulp fibers and/or cellulose fibers and/or additives into the annular flow of the annular channel.
  • Several air nozzles 6 flow along the ring channel of the ring distributor 2 to generate an air flow and to break up fiber agglomerates these are resolved into individual fibers. In this example, this effect is further supported by mixed particles 8 for mixing the fibers and for breaking up fiber agglomerates.
  • the calming channel 4 is arranged at a small distance from the forming fabric 5 .
  • a suction device 11 is assigned to the forming fabric. As a result, fiber placement is supported and a more compact fiber mat or a more compact fiber mat web can be achieved.
  • FIG. 2 shows a side view of the embodiment according to FIG. 1 in a simplified, schematic representation.
  • the cleaning nozzles 7 acted upon by compressed air or air from a blower for cleaning the outlet element 3 are shown here. To improve the cleaning effect, these can be arranged in a circular oscillating manner about an imaginary axis perpendicular to the plane of the drawing. It is also conceivable that they are set up to oscillate in an elliptical manner. In addition, it is possible for the oscillating movement to be combined with a translatory movement.
  • the air-laying device 1 can be designed as suitable for laboratory use and the forming fabric can be arranged statically.
  • the air-laying device 1 shown is designed to be suitable for the continuous production of fiber mat webs. In this case, the forming fabric 5 can be moved in a running direction 9 . It is preferably designed as a circulating belt guided over a number of rollers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Nonwoven Fabrics (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Abstract

L'invention concerne un dispositif de formation par flux d'air (1) qui permet de produire un mat de fibres au moins partiellement à partir de fibres de pâte de bois et/ou de fibres de cellulose, et qui comprend un distributeur annulaire (2) ayant une alimentation en fibres (10), un canal annulaire ayant un élément de sortie (3) formant une partie du canal annulaire, cette partie étant agencée à l'intérieur d'un canal de stabilisation (4) s'étendant vers le bas dans la direction d'une toile de formation (5), et l'élément de sortie (3) présentant des ouvertures à travers lesquelles les fibres introduites par l'alimentation en fibres (10) sortent du canal annulaire dans le canal de stabilisation (4) et peuvent se déplacer vers la toile de formation afin de former le mat de fibres sur la toile de formation (5).
EP21782701.3A 2020-09-29 2021-09-22 Dispositif de formation par flux d'air Pending EP4222310A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020125404.0A DE102020125404A1 (de) 2020-09-29 2020-09-29 Luftlegeeinrichtung
PCT/EP2021/076003 WO2022069305A1 (fr) 2020-09-29 2021-09-22 Dispositif de formation par flux d'air

Publications (1)

Publication Number Publication Date
EP4222310A1 true EP4222310A1 (fr) 2023-08-09

Family

ID=77998979

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21782701.3A Pending EP4222310A1 (fr) 2020-09-29 2021-09-22 Dispositif de formation par flux d'air

Country Status (5)

Country Link
US (1) US20230235493A1 (fr)
EP (1) EP4222310A1 (fr)
CN (1) CN116324087A (fr)
DE (1) DE102020125404A1 (fr)
WO (1) WO2022069305A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2931076A (en) 1948-11-23 1960-04-05 Fibrofelt Corp Apparatus and method for producing fibrous structures
DE4430961A1 (de) 1994-08-31 1996-03-07 Christoph Dr Ing Freist Verfahren zur Herstellung eines Dämmelements sowie ein Dämmelement
ATE279561T1 (de) * 1998-04-21 2004-10-15 M & J Fibretech As Siebnetz zur verteilung von fasern
EP1683432A1 (fr) * 2003-04-03 2006-07-26 Hauni Maschinenbau Aktiengesellschaft Procédé et dispositif pour la production d'une tige de filtre
DE102004021453A1 (de) 2004-04-29 2005-11-17 Concert Gmbh Formkopf und Verfahren zum Herstellen eines Faservlieses
DE102019114037A1 (de) 2019-05-26 2020-11-26 Dieffenbacher GmbH Maschinen- und Anlagenbau Vorrichtung und Verfahren zur Herstellung eines Vlieses

Also Published As

Publication number Publication date
US20230235493A1 (en) 2023-07-27
WO2022069305A1 (fr) 2022-04-07
DE102020125404A1 (de) 2022-03-31
CN116324087A (zh) 2023-06-23

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