EP3495544B1 - Device for hydro-needling nonwoven fabrics, tissues or knitted fabrics - Google Patents

Device for hydro-needling nonwoven fabrics, tissues or knitted fabrics Download PDF

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Publication number
EP3495544B1
EP3495544B1 EP18200089.3A EP18200089A EP3495544B1 EP 3495544 B1 EP3495544 B1 EP 3495544B1 EP 18200089 A EP18200089 A EP 18200089A EP 3495544 B1 EP3495544 B1 EP 3495544B1
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EP
European Patent Office
Prior art keywords
suction
fibre web
endless belt
fiber web
diverting
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EP18200089.3A
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German (de)
French (fr)
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EP3495544A1 (en
Inventor
Florian Seils
Thomas Weigert
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Truetzschler GmbH and Co KG
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Truetzschler GmbH and Co KG
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Publication of EP3495544A1 publication Critical patent/EP3495544A1/en
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    • 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
    • D04H18/00—Needling machines
    • D04H18/04—Needling machines with water jets

Definitions

  • the invention relates to a device for the hydrodynamic consolidation of nonwovens, woven or knitted fabrics, comprising a consolidation system with at least one water bar and a drum or an endless belt, between which a fibrous web is transported and consolidated.
  • the fiber web is compacted before the consolidation by moistening and compacting it between two belts or between a belt and a drum. This slightly pre-consolidates the fleece, making it less sensitive to further consolidation.
  • the fibers are then entwined by swirling them together using high-pressure water jets.
  • the fibers are entangled by nozzle bars from which water jets hit the fiber web under high pressure.
  • the belt or drum lying under the fiber web has a large number of openings, into which the fibers can partly enter and are swallowed up, and through which the water of the water jets is sucked off or discharged. Usually 2-3 water bars are arranged one behind the other.
  • the fiber web is very sensitive to the water jets or the suction.
  • the fibers can shift, which can have a negative impact on the appearance of the fiber web as well as on the strength and elongation.
  • the hydroentangling of chemical fibers such as polyester or Polypropylene is only possible to a limited extent without compacting. Care must be taken to ensure the correct pressure, the distance of the water bar from the fiber web and the associated suction power. As soon as fluctuations in the composition of the fiber web are recognizable, all parameters have to be adjusted again and again. Reliable production is not possible for a long time.
  • the known systems of the prior art have, for example, spunlace drums or hydroentangling drums. Alternatively, a corresponding endless belt is used, which is referred to as spunlace belt or hydroentangling belt.
  • the DE 10 2013 101 431 A1 the existing method is improved in that a compacting device is arranged in the running direction of the fiber web in front of the water bar, which compacting the fiber web on the drum or the endless belt.
  • the compacting device is designed as a compacting plate that presses the fiber web onto the drum or the endless belt.
  • This compacting device has proven itself in nonwovens and fiber webs in which the basis weight is from 60 g / m 2 and the transport speed is up to 90 m / min. At higher speeds in connection with lighter or lower basis weights, which are less than 60 g / m 2 , the compacting plate can build up the entrained air in such a way that the fleece or the fibrous web jumps open and the surface of the material thus becomes irregular.
  • the device for hydrodynamic consolidation of nonwovens, woven or knitted fabrics comprises a consolidation system with at least one water bar and a drum or an endless belt, between which a fibrous web is transported and consolidated.
  • a compacting device is integrated on or in the consolidation system, ie the water bar and the drum or the endless belt, which is designed as a compacting plate.
  • At least one diverter is arranged in front of the compacting plate above and / or below the fiber web, with which the air entrained by the fiber web is discharged.
  • the discharge device can be designed such that it is actively sucked in with a negative pressure or that the entrained air is discharged in a streamlined manner in such a way that no air jam occurs in front of or under the compacting plate.
  • At least one discharge device is provided which discharges the entrained air above or below the fiber web.
  • a combination of different discharge devices below and / or above the fiber web is also possible.
  • the discharge devices can also be positioned several times in succession only below or only above the fiber web.
  • the discharge device can be designed as a roller with at least one opening through which the air is discharged laterally.
  • the roller can simultaneously compact the fiber web on the endless belt or on a drum.
  • the discharge device can also below of the Kompaktierbleches arranged and designed to derive the air flow.
  • a vacuum can preferably be applied to the discharge device, or it can be designed in terms of flow technology so that a vacuum is formed at the inlet opening of the discharge device.
  • the at least one discharge device can be designed as a suction roller, which has a plurality of openings on its circumference for discharging the air carried along.
  • the suction roller is only to be used to discharge the entrained air, it is preferably arranged at a distance from the fiber web.
  • the distance can be between 2 and 50 mm depending on the working width.
  • the suction roll can interact with a pressure roll or deflection roll for the endless belt and be designed to compact the fiber web.
  • the suction roll with compacting function can interact with the endless belt and be designed to compact the fiber web.
  • the suction roll can be swiveled under the horizontal plane of the endless belt or moved in order to build up the necessary pressure.
  • Both embodiments provide a driven suction roller during the compacting, which is operated at the same peripheral speed as the working or transport speed of the fiber web. If there is a speed difference, it is also possible to compress or warp the fiber web.
  • the at least one deflection device is designed as at least one suction hood into which the air flow entrained by the fiber web enters tangentially. Due to the tangential inflow of the air flow, a swirl can be generated within the suction hood, whereby the air flow is discharged laterally without applying a vacuum. This results in a very inexpensive retrofittable solution. A low vacuum on the exhaust hood ensures that the air flow is directed away.
  • the at least one discharge device is designed as a suction box, which is arranged below the fiber web and which exerts a negative pressure on the fiber web.
  • a negative pressure By applying a negative pressure, the fiber web is straightened and fed to the compaction without warping. Since the device is used in particular in the case of thin or light fiber webs, the negative pressure also causes the entrained air flow to be discharged through the fiber web into the suction box, as a result of which no air jam occurs in front of the compacting plate.
  • the suction box can be arranged separately before the water jets are extracted.
  • a space-saving embodiment is the integration of the at least one discharge device as a suction opening in the suction pipe for the water jets.
  • the suction opening is arranged in front of the compacting plate in the transport direction of the fiber web.
  • the at least one suction box advantageously has at least one outer side which adapts to the contour of the drum and / or the course of the fiber web. This means that a suction box can be installed very close to the compacting sheet in the system in difficult spaces.
  • the arrangement of the diverter device in front of or under the compacting plate is the arrangement of the diverter device in front of or under the compacting plate.
  • the distance should be selected so that no new disruptive air flow is created between the discharge device and the compacting plate. It is not critical whether the discharge device is arranged in the area of the same endless belt 7 or an upstream component, not shown, for example a card take-off.
  • a maximum distance of 2 m between the discharge device and the outlet edge of the compacting plate in the transport direction of the fiber web 2 has proven to be particularly effective.
  • FIG. 1 A solidification system 1 according to the prior art is shown, which essentially comprises an endless belt 7 or alternatively a drum with at least one water bar 4.
  • the endless belt 7 can be designed as a sieve belt to drain the water quickly.
  • a suction pipe 3b is shown as a rectangular box, which likewise has at least one suction slot 3c.
  • the compacting plate 14 can be arranged directly on the water bar 4 and be attached.
  • the attachment 15 in the area of the rear edge of the compacting plate 14 can be carried out on a side wall of the water bar 4, or of course also on the lower surface in the area of the nozzles 5. This has the advantage that the outlet edge 14a is very well aligned with the water jet 6 can be.
  • the lateral attachment 15 to the water bar 4 can also have a height adjustment, among other things, so that the pressure on the fiber web 2 can be adjusted via the spring action of the straight or curved compacting plate 14.
  • the fibrous web 2 is transported from left to right.
  • the compacting is carried out by the compacting plate 14 close to the water jet 6, which prevents the fiber web 2 from being sucked in larger areas in front of the row of water jets 6 or from the vacuum into the suction pipe 3b and the fiber web from becoming entangled deformed in the process.
  • the compacting plate 14 can increase the strength in the longitudinal direction of the fibrous web 2 due to the compacting action shortly before solidification by the water jets 6, since the trailing edge 14a only slides over the surface of the fibrous web 2. In contrast, there is no change in the orientation of the fibers over the entire cross section of the fiber web 2. Only the portion or strip of the fiber web 2 between the compacting plate 14 and the water jets 6 is stretched and the fibers are intertwined. At high speeds, the air entrained by the fiber web 2 builds up on the compacting plate 14. As a result, part of the air flow is laterally deflected by the endless belt 7. Another part of the air flow penetrates through the fiber web 2, builds up and creates warps in the fiber web 2, which can lift off the endless belt 7 shortly before the compacting plate 14.
  • the invention provides for the air flow to be discharged above and / or below the fiber web 2 or derive.
  • a discharge device for removing or discharging the entrained air can be arranged in front of or below the compacting plate 14.
  • the discharge device can be designed as a roller with at least one opening through which the air is discharged laterally.
  • the roller can simultaneously compact the fiber web 2 on the endless belt 7 or on a drum.
  • the diverter can also be arranged and designed below the compacting plate to diverge the air flow.
  • a vacuum can preferably be applied to the discharge device, or it can be designed in terms of flow technology so that a vacuum is formed at the inlet opening of the discharge device.
  • the discharge device in the area of a storage belt in front of the endless belt 7 or the drum 3, if the space conditions here are such that the air flow can be carried away cheaply to the side or above the system. Care must be taken to ensure that a new air flow does not form behind the discharge device.
  • an arrangement of the discharge device at a maximum distance of 2 m in front of the compacting plate can be useful, regardless of whether in the area of the same endless belt 7 or an upstream component, not shown.
  • a discharge device in the form of a suction device is arranged above the endless belt 7 directly in front of the compacting plate 14 and is designed as a roller 8 20.
  • the roller 8 has a multiplicity of openings which are distributed over the circumference of the cylinder jacket, into which the air flow penetrates and is discharged laterally. If the roller 8 is to be vacuumed, it is designed as a suction roller 22 and is subjected to a slight negative pressure of up to 0.3 bar (0.7 bar absolute) and diverts the air flow carried along by the fiber web 2.
  • the roller 8 or Suction roller 20 can be arranged above the fibrous web 2 with a small gap of 0.5 to 5 mm and can exert no pressure on the fibrous web 2. In this embodiment, the roller 8 or suction roller 20 is not driven and is therefore stationary. It can be arranged to be pivotable in order to facilitate the start-up of the system and to facilitate maintenance work on the water bar 4.
  • roller 8 or suction roller 20 can compact the fiber web 2 with the endless belt 7.
  • a pressure roller 21 can be arranged below the endless belt 7, which compacted the fiber web 2 together with the roller 8 or suction roller 20.
  • the roller 8 or suction roller 20 rests on the fibrous web 2 with the endless belt 7, counter pressure being generated by the pressure roller 21.
  • Both rollers 8 or 20 and 21 rotate at the same peripheral speed, which preferably corresponds to the transport speed of the fiber web, so as not to produce any distortion.
  • a deflection roller of the endless belt 7 can also be used, provided that it is arranged close to the area of the compacting plate 14.
  • Figure 2 shows the distance X between the discharge device (roller 8 or suction roller 20) and the outlet edge 14a of the compacting plate 14, which is a maximum of 2 m.
  • the roller 8 or suction roller 20 is designed as a rotating compacting roller which, together with the endless belt 7, compresses the fiber web 2.
  • the peripheral speed of the roller 8 or suction roller 20 is preferably identical to the transport speed of the fibrous web 2.
  • the roller 8 or suction roller 20 is designed such that it can be pivoted below the horizontal plane of the endless belt 7 and thus a pressure on it the fiber web 2 and the endless belt 7 exercises.
  • Figure 4 shows a diverter of the air flow above the fiber web 2, in which a suction hood 22 is arranged above the endless belt 7 and discharges the air flow entrained with the fiber web 2.
  • the suction hood 22 is essentially designed in cross section as a cylindrical tube that extends over the working width of the endless belt 7. Along the longitudinal axis of the suction hood 22, the jacket of the tube is slit open and bent to an opening, so that here a larger diameter results than the original inner diameter.
  • the opening of the suction hood 22 also extends over the entire working width of the endless belt and absorbs the air flow entrained by the fiber web 2.
  • the suction hood 22 can advantageously be set at a distance from the endless belt and rotated around the suspension point in order to position the opening for the air flow.
  • several suction hoods 22 can be arranged one behind the other in front of the water bar 4, it being possible for the arrangement to be at offset distances from the fiber web 2.
  • the at least one suction hood 22 can also be actively vacuumed.
  • Figure 5 shows a discharge device in the form of a suction box 23, which is arranged below the endless belt 7 below the compacting plate 14 and can be provided separately from the suction pipe 3b for the water jets 6 with a negative pressure ( ⁇ p). Since the air flow entrained by the fiber web 2 accumulates in front of the compacting plate 14 and at least partially flows through the fiber web 2 and the endless belt 7, the suction box 23 generates an alignment of the air flow with its negative pressure, with which the fiber web 2 without warping on the endless belt 7 remains.
  • the suction box 23 is separated from the suction pipe 3b, whereby the water and the air can be discharged separately.
  • this embodiment shows a suction opening 23a arranged obliquely to the endless belt 7, into which the air flow flowing through the fiber web runs vertically.
  • This variant is particularly suitable for retrofitting under an existing consolidation system 1.
  • Figure 6 shows a suction opening 3d for the air flow flowing through the fiber web 2, which is integrated in the suction pipe 3b.
  • the suction opening 3d is arranged in front of the compacting plate 14 in the working direction and can have a suction independent of the suction slot 3c.
  • FIG. 7 shows an embodiment with a vacuumed drum 3.
  • the drum 3 can be designed as a so-called sieve drum, comprising a perforated plate drum, which is covered with a support fabric and a fine sieve or alternatively with a microporous shell.
  • the drum can be designed as a structure drum, the surface of which has a perforation in order to give the fiber web 2 a structure or a pattern.
  • the drum 3 has a multiplicity of bores 3a, through which the water of the water bar 4 is discharged.
  • a suction pipe 3b with a multiplicity of suction slots 3c Arranged inside the drum 3 is a suction pipe 3b with a multiplicity of suction slots 3c, via which the water is sucked off under reduced pressure.
  • the water bar 4 is arranged above the drum 3 and sprays a series of water jets 6 onto the fiber web 2 under high pressure by means of a plurality of nozzles 5.
  • the water bar 4 is operated at a pressure of 10 to 100 bar, preferably at a pressure of 20 to 40 bar.
  • the nozzle bar 4 can be operated with one or more rows of water jets 6.
  • the nozzles 5 are arranged along the longitudinal axis of the water bar 4. Because of Only a number of water jets 6 are shown for clarity.
  • the fibrous web 2 runs in the direction of the arrow from left to right over the drum 3 and is continuously hit by the water jets 6.
  • the water bar 4 is arranged adjustable at a distance from the drum 3 or the endless web.
  • the compacting plate 14 can be fastened to a rotatable suspension 11 with which the compacting plate 14 can be retrofitted into an existing system.
  • a discharge device in the form of a suction box 23, the contour of which adjusts to the course of the fiber web 2 with the suction opening 23a.
  • the outer wall assigned to the drum 3 can also be designed with a contour. In this case, the air flow resulting from the transport speed of the fiber web 2 is sucked off through the suction box 23, so that the fiber web 2 is not thrown up in front of the compacting plate 14. Except for the embodiment of Figure 6 all described and illustrated variants of a discharge of the air flow arranged above or below are also possible with the drum 3.

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Description

Die Erfindung betrifft eine Vorrichtung zur hydrodynamischen Verfestigung von Vliesen, Geweben oder Gewirken, umfassend eine Verfestigungsanlage mit mindestens einem Wasserbalken und einer Trommel oder einem Endlosband, zwischen denen eine Faserbahn transportiert und verfestigt wird.The invention relates to a device for the hydrodynamic consolidation of nonwovens, woven or knitted fabrics, comprising a consolidation system with at least one water bar and a drum or an endless belt, between which a fibrous web is transported and consolidated.

In den Anlagen zum hydrodynamischen Verfestigen von Faserbahnen erfolgt vor der Verfestigung eine Kompaktierung der Faserbahn, indem diese zwischen zwei Bändern oder zwischen einem Band und einer Trommel befeuchtet und verdichtet wird. Dadurch wird das Vlies leicht vorverfestigt, so dass es für die weitere Verfestigung unempfindlicher wird. Anschließend erfolgt die Verschlingung der Fasern, indem diese durch Hochdruckwasserstrahlen miteinander verwirbelt werden. Die Verschlingung der Fasern erfolgt durch Düsenbalken, aus denen Wasserstrahlen unter Hochdruck auf die Faserbahn auftreffen. Das unter der Faserbahn liegende Band oder die Trommel weisen eine Vielzahl von Öffnungen auf, in die einerseits die Fasern teilweise eintreten können und miteinander verschlungen werden, und über die andererseits das Wasser der Wasserstrahlen abgesaugt bzw. abgeführt wird. Üblicherweise werden 2-3 Wasserbalken hintereinander angeordnet. Ohne Kompaktierung ist die Faserbahn sehr empfindlich gegenüber den Wasserstrahlen bzw. der Absaugung. Die Fasern können sich verschieben, was sich negativ auf die Optik der Faserbahn sowie auf die Festigkeit und Dehnung auswirken kann. Die Wasserstrahlverfestigung von Chemiefasern wie Polyester oder Polypropylen ist ohne Kompaktierung nur begrenzt möglich. Dabei muss sehr sorgfältig auf den richtigen Druck, den Abstand des Wasserbalkens von der Faserbahn und auf die zugehörige Absaugleistung geachtet werden. Sobald Schwankungen in der Zusammensetzung der Faserbahn erkennbar sind, müssen sämtliche Parameter immer wieder angepasst werden. Eine betriebssichere Produktion ist auf längere Zeit damit nicht möglich. Die bekannten Anlagen zum Stand der Technik weisen beispielsweise Spunlacetrommeln oder Wasserstrahlverfestigungstrommeln auf. Alternativ wird ein entsprechendes Endlosband eingesetzt, das als Spunlaceband oder Wasserstrahlverfestigungsband bezeichnet wird.In the systems for the hydrodynamic consolidation of fiber webs, the fiber web is compacted before the consolidation by moistening and compacting it between two belts or between a belt and a drum. This slightly pre-consolidates the fleece, making it less sensitive to further consolidation. The fibers are then entwined by swirling them together using high-pressure water jets. The fibers are entangled by nozzle bars from which water jets hit the fiber web under high pressure. The belt or drum lying under the fiber web has a large number of openings, into which the fibers can partly enter and are swallowed up, and through which the water of the water jets is sucked off or discharged. Usually 2-3 water bars are arranged one behind the other. Without compacting, the fiber web is very sensitive to the water jets or the suction. The fibers can shift, which can have a negative impact on the appearance of the fiber web as well as on the strength and elongation. The hydroentangling of chemical fibers such as polyester or Polypropylene is only possible to a limited extent without compacting. Care must be taken to ensure the correct pressure, the distance of the water bar from the fiber web and the associated suction power. As soon as fluctuations in the composition of the fiber web are recognizable, all parameters have to be adjusted again and again. Reliable production is not possible for a long time. The known systems of the prior art have, for example, spunlace drums or hydroentangling drums. Alternatively, a corresponding endless belt is used, which is referred to as spunlace belt or hydroentangling belt.

Um diesen Zustand zu verbessern, wurde mit der DE 10 2013 101 431 A1 das bestehende Verfahren dahingehend verbessert, dass in Laufrichtung der Faserbahn vor dem Wasserbalken eine Kompaktiereinrichtung angeordnet ist, die die Faserbahn auf der Trommel oder dem Endlosband verdichtet. Die Kompaktiereinrichtung ist als Kompaktierblech ausgebildet, das die Faserbahn auf die Trommel oder das Endlosband drückt.To improve this condition, the DE 10 2013 101 431 A1 the existing method is improved in that a compacting device is arranged in the running direction of the fiber web in front of the water bar, which compacting the fiber web on the drum or the endless belt. The compacting device is designed as a compacting plate that presses the fiber web onto the drum or the endless belt.

Diese Kompaktiereinrichtung hat sich bei Vliesen und Faserbahnen bewährt, bei denen das Flächengewicht ab 60 g/m2 und die Transportgeschwindigkeit bis 90 m/min beträgt. Bei höheren Geschwindigkeiten in Verbindung mit leichteren bzw. geringeren Flächengewichten, die unter 60 g/m2 betragen, kann das Kompaktierblech die mitgeschleppte Luft derart aufstauen, dass das Vlies oder die Faserbahn aufspringt und damit die Oberfläche des Materials unregelmäßig wird.This compacting device has proven itself in nonwovens and fiber webs in which the basis weight is from 60 g / m 2 and the transport speed is up to 90 m / min. At higher speeds in connection with lighter or lower basis weights, which are less than 60 g / m 2 , the compacting plate can build up the entrained air in such a way that the fleece or the fibrous web jumps open and the surface of the material thus becomes irregular.

Es ist Aufgabe der Erfindung die bestehende Vorrichtung zu verbessern.It is an object of the invention to improve the existing device.

Die Erfindung löst die gestellte Aufgabe durch die Lehre nach Anspruch 1. Weitere vorteilhafte Ausgestaltungsmerkmale der Erfindung sind durch die Unteransprüche gekennzeichnet.The invention solves the stated problem by the teaching according to claim 1. Further advantageous design features of the invention are characterized by the subclaims.

Gemäß der technischen Lehre nach Anspruch 1 umfasst die Vorrichtung zur hydrodynamischen Verfestigung von Vliesen, Geweben oder Gewirken, eine Verfestigungsanlage mit mindestens einem Wasserbalken und einer Trommel oder einem Endlosband, zwischen denen eine Faserbahn transportiert und verfestigt wird. Dabei wird eine Kompaktiereinrichtung an oder in die Verfestigungsanlage, also dem Wasserbalken und der Trommel bzw. dem Endlosband, integriert, die als Kompaktierblech ausgebildet ist.According to the technical teaching according to claim 1, the device for hydrodynamic consolidation of nonwovens, woven or knitted fabrics comprises a consolidation system with at least one water bar and a drum or an endless belt, between which a fibrous web is transported and consolidated. In this case, a compacting device is integrated on or in the consolidation system, ie the water bar and the drum or the endless belt, which is designed as a compacting plate.

Erfindungsgemäß ist vorgesehen, dass in Laufrichtung der Faserbahn vor dem Kompaktierblech oberhalb und/oder unterhalb der Faserbahn mindestens eine Ableitvorrichtung angeordnet ist, mit der die durch die Faserbahn mitgeführte Luft abgeleitet wird.According to the invention it is provided that in the running direction of the fiber web at least one diverter is arranged in front of the compacting plate above and / or below the fiber web, with which the air entrained by the fiber web is discharged.

Die Ableitvorrichtung kann so ausgebildet sein, dass diese aktiv mit einem Unterdruck besaugt wird, oder die mitgeschleppte Luft strömungsgünstig so ableitet, dass vor bzw. unter dem Kompaktierblech kein Luftstau auftritt.The discharge device can be designed such that it is actively sucked in with a negative pressure or that the entrained air is discharged in a streamlined manner in such a way that no air jam occurs in front of or under the compacting plate.

Mit den Merkmalen der Erfindung ist es möglich, die durch das Vlies oder die Faserbahn mitgeschleppte Luft derart zu lenken bzw. abzuführen, dass ein Aufspringen des Vlieses oder der Faserbahn vermieden wird. Erfindungsgemäß ist mindestens eine Ableitvorrichtung vorgesehen, die oberhalb oder unterhalb der Faserbahn die mitgeschleppte Luft ableitet. Dabei ist auch eine Kombination von unterschiedlichen Ableitvorrichtungen unterhalb und/oder oberhalb der Faserbahn möglich. Die Ableitvorrichtungen können auch nur unterhalb oder nur oberhalb der Faserbahn mehrfach hintereinander positioniert werden.With the features of the invention it is possible to direct or remove the air entrained by the fleece or the fibrous web in such a way that the fleece or the fibrous web is prevented from jumping open. According to the invention, at least one discharge device is provided which discharges the entrained air above or below the fiber web. A combination of different discharge devices below and / or above the fiber web is also possible. The discharge devices can also be positioned several times in succession only below or only above the fiber web.

Die Ableitvorrichtung kann als Walze mit mindestens einer Öffnung ausgebildet sein, über die die Luft seitlich abgeführt wird. Dabei kann die Walze gleichzeitig die Faserbahn auf dem Endlosband, oder auf einer Trommel kompaktieren. Die Ableitvorrichtung kann aber auch unterhalb des Kompaktierbleches angeordnet und ausgebildet sein, die Luftströmung abzuleiten. Vorzugsweise kann die Ableitvorrichtung mit einem Unterdruck beaufschlagt werden oder strömungstechnisch so ausgebildet sein, dass sich ein Unterdruck an der Einströmöffnung der Ableitvorrichtung bildet. Je nach Anlagenkonfiguration kann es sinnvoll sein, die Ableitvorrichtung im Bereich eines Ablagebandes vor dem Endlosband 7 oder der Trommel 3 anzuordnen, wenn gerade hier die Platzverhältnisse so ausgebildet sind, dass die Luftströmung seitlich oder oberhalb der Anlage günstig abzuführen sind. Dabei muss darauf geachtet werden, dass sich nicht hinter der Ableitvorrichtung eine neue Luftströmung bildet.The discharge device can be designed as a roller with at least one opening through which the air is discharged laterally. The roller can simultaneously compact the fiber web on the endless belt or on a drum. The discharge device can also below of the Kompaktierbleches arranged and designed to derive the air flow. A vacuum can preferably be applied to the discharge device, or it can be designed in terms of flow technology so that a vacuum is formed at the inlet opening of the discharge device. Depending on the system configuration, it may be advisable to arrange the discharge device in the area of a storage belt in front of the endless belt 7 or the drum 3, if the space conditions here are designed such that the air flow can be carried away cheaply to the side or above the system. Care must be taken to ensure that a new air flow does not form behind the discharge device.

In vorteilhafter Ausgestaltung kann die mindestens eine Ableitvorrichtung als Saugwalze ausgebildet sein, die auf ihrem Umfang eine Vielzahl von Öffnungen zur Ableitung der mitgeschleppten Luft aufweist.In an advantageous embodiment, the at least one discharge device can be designed as a suction roller, which has a plurality of openings on its circumference for discharging the air carried along.

Wenn die Saugwalze ausschließlich zur Ableitung der mitgeschleppten Luft dienen soll, ist diese vorzugsweise beabstandet zur Faserbahn angeordnet. Der Abstand kann je nach Arbeitsbreite zwischen 2 und 50 mm betragen.If the suction roller is only to be used to discharge the entrained air, it is preferably arranged at a distance from the fiber web. The distance can be between 2 and 50 mm depending on the working width.

Soll die Saugwalze auch eine Kompaktierfunktion übernehmen, dann kann die Saugwalze mit einer Druckwalze oder Umlenkwalze für das Endlosband zusammenwirken und ausgebildet sein, die Faserbahn zu kompaktieren.If the suction roll is also to perform a compacting function, the suction roll can interact with a pressure roll or deflection roll for the endless belt and be designed to compact the fiber web.

In einer alternativen Ausführungsform der Saugwalze mit Kompaktierfunktion kann diese mit dem Endlosband zusammenwirken und ausgebildet sein, die Faserbahn zu kompaktieren. Hierzu kann die Saugwalze unter die horizontale Ebene des Endlosbandes verschwenkt oder verfahren werden, um den notwendigen Druck aufzubauen.In an alternative embodiment of the suction roll with compacting function, it can interact with the endless belt and be designed to compact the fiber web. For this purpose, the suction roll can be swiveled under the horizontal plane of the endless belt or moved in order to build up the necessary pressure.

Beide Ausführungsformen sehen bei der Kompaktierung eine angetriebene Saugwalze vor, die mit gleicher Umfangsgeschwindigkeit betrieben wird, wie die Arbeits- oder Transportgeschwindigkeit der Faserbahn. Bei einer Geschwindigkeitsdifferenz ist auch ein Stauchen oder Verziehen der Faserbahn möglich.Both embodiments provide a driven suction roller during the compacting, which is operated at the same peripheral speed as the working or transport speed of the fiber web. If there is a speed difference, it is also possible to compress or warp the fiber web.

In einer alternativen oder ergänzenden Ausführungsform ist die mindestens eine Ableitvorrichtung als mindestens eine Absaughaube ausgebildet, in die die durch die Faserbahn mitgerissene Luftströmung tangential einläuft. Durch das tangentiale Einlaufen der Luftströmung kann innerhalb der Absaughaube ein Drall erzeugt werden, wodurch die Luftströmung ohne Anlegen eines Unterdruckes seitlich abgeführt wird. Damit ergibt sich eine sehr preiswerte nachrüstbare Lösung. Ein geringer Unterdruck an der Absaughaube sorgt für eine gerichtete Abführung der Luftströmung.In an alternative or additional embodiment, the at least one deflection device is designed as at least one suction hood into which the air flow entrained by the fiber web enters tangentially. Due to the tangential inflow of the air flow, a swirl can be generated within the suction hood, whereby the air flow is discharged laterally without applying a vacuum. This results in a very inexpensive retrofittable solution. A low vacuum on the exhaust hood ensures that the air flow is directed away.

In einer alternativen oder ergänzenden Ausführungsform ist die mindestens eine Ableitvorrichtung als Absaugkasten ausgebildet, der unterhalb der Faserbahn angeordnet ist, und der einen Unterdruck auf die Faserbahn ausübt. Durch das gezielte Anlegen eines Unterdruckes wird die Faserbahn gerichtet und ohne Verwerfungen der Kompaktierung zugeführt. Da die Vorrichtung insbesondere bei dünnen bzw. leichten Faserbahnen verwendet wird, bewirkt der Unterdruck auch ein Abführen der mitgeschleppten Luftströmung durch die Faserbahn in den Absaugkasten, wodurch vor dem Kompaktierblech kein Luftstau entsteht. Hierzu kann der Absaugkasten separat vor der Absaugung der Wasserstrahlen angeordnet sein.In an alternative or additional embodiment, the at least one discharge device is designed as a suction box, which is arranged below the fiber web and which exerts a negative pressure on the fiber web. By applying a negative pressure, the fiber web is straightened and fed to the compaction without warping. Since the device is used in particular in the case of thin or light fiber webs, the negative pressure also causes the entrained air flow to be discharged through the fiber web into the suction box, as a result of which no air jam occurs in front of the compacting plate. For this purpose, the suction box can be arranged separately before the water jets are extracted.

Eine platzsparende Ausführungsform ist die Integration der mindesten einen Ableitvorrichtung als Absaugöffnung in das Saugrohr für die Wasserstrahlen. Auch hier ist die Absaugöffnung in Transportrichtung der Faserbahn vor dem Kompaktierblech angeordnet.A space-saving embodiment is the integration of the at least one discharge device as a suction opening in the suction pipe for the water jets. Here, too, the suction opening is arranged in front of the compacting plate in the transport direction of the fiber web.

Vorteilhafterweise weist der mindestens eine Absaugkasten zumindest eine Außenseite auf, die sich der Kontur der Trommel und/oder dem Verlauf der Faserbahn anpasst. Damit kann ein Absaugkasten bei schwierigen Platzverhältnissen sehr dicht vor dem Kompaktierblech in die Anlage eingebaut werden.The at least one suction box advantageously has at least one outer side which adapts to the contour of the drum and / or the course of the fiber web. This means that a suction box can be installed very close to the compacting sheet in the system in difficult spaces.

Allen Ausführungsformen gemeinsam, die mit einem Unterdruck besaugt werden, ist die vorteilhafte Besaugung mit einem Unterdruck von bis zu 0,3 bar. Die Absaugung kann damit an das Luftsystem der Anlage angeschlossen und integriert werden.Common to all of the embodiments that are vacuumed with a vacuum is the advantageous vacuuming with a vacuum of up to 0.3 bar. The extraction system can thus be connected to the system's air system and integrated.

Allen Ausführungsformen gemeinsam ist auch die Anordnung der Ableitvorrichtung vor oder unter dem Kompaktierblech. Dabei ist der Abstand so zu wählen, dass keine neue störende Luftströmung zwischen der Ableitvorrichtung und dem Kompaktierblech entsteht. Es ist dabei nicht entscheidend, ob die Ableitvorrichtung im Bereich des gleichen Endlosbandes 7 oder einer vorgeschalteten nicht dargestellten Komponente, beispielsweise einem Krempelabzug, angeordnet ist.Common to all of the embodiments is the arrangement of the diverter device in front of or under the compacting plate. The distance should be selected so that no new disruptive air flow is created between the discharge device and the compacting plate. It is not critical whether the discharge device is arranged in the area of the same endless belt 7 or an upstream component, not shown, for example a card take-off.

Als besonders wirksam hat sich ein maximaler Abstand zwischen der Ableitvorrichtung und der Auslaufkante des Kompaktierbleches in Transportrichtung der Faserbahn 2 von 2 m herausgestellt.A maximum distance of 2 m between the discharge device and the outlet edge of the compacting plate in the transport direction of the fiber web 2 has proven to be particularly effective.

Die Erfindung wird nachfolgend anhand eines möglichen schematisch dargestellten Ausführungsbeispieles näher erläutert. Es zeigt:

Figur 1:
eine schematische Seitenansicht auf eine Verfestigungsanlage mit einem Transportband nach dem Stand der Technik;
Figur 2:
eine erste erfindungsgemäße Ausführungsform der Vorrichtung mit einer Ableitvorrichtung oberhalb der Faserbahn;
Figur 3
eine zweite erfindungsgemäße Ausführungsform der Vorrichtung mit einer Ableitvorrichtung oberhalb der Faserbahn;
Figur 4:
eine dritte erfindungsgemäße Ausführungsform der Vorrichtung mit einer Ableitung oberhalb der Faserbahn;
Figur 5:
eine zweite Ausführungsform der Vorrichtung mit einer Ableitvorrichtung unterhalb des Vlieses bzw. der Faserbahn;
Figur 6:
eine weitere Ausführungsform der Vorrichtung nach Figur 5;
Figur 7:
eine weitere Ausführungsform der Vorrichtung mit einer Trommel.
The invention is explained in more detail below on the basis of a possible schematically illustrated exemplary embodiment. It shows:
Figure 1:
a schematic side view of a consolidation system with a conveyor belt according to the prior art;
Figure 2:
a first embodiment of the device according to the invention with a diverter above the fiber web;
Figure 3
a second embodiment of the device according to the invention with a diverter above the fiber web;
Figure 4:
a third embodiment of the device according to the invention with a derivation above the fiber web;
Figure 5:
a second embodiment of the device with a diverter below the fleece or the fiber web;
Figure 6:
another embodiment of the device according to Figure 5 ;
Figure 7:
a further embodiment of the device with a drum.

In Figur 1 ist eine Verfestigungsanlage 1 nach dem Stand der Technik dargestellt, die im Wesentlichen ein Endlosband 7 oder alternativ eine Trommel mit mindestens einem Wasserbalken 4 umfasst. Das Endlosband 7 kann als Siebband ausgeführt sein, um das Wasser schnell abzuführen. Unterhalb des Endlosbandes 7 ist im Bereich der Düse 5 ein Saugrohr 3b als rechteckiger Kasten dargestellt, der ebenfalls mindestens einen Absaugschlitz 3c aufweist. Das Kompaktierblech 14 kann nach dieser Ausführungsform direkt am Wasserbalken 4 angeordnet und befestigt sein. Die Befestigung 15 im Bereich der hinteren Kante des Kompaktierbleches 14 kann an einer seitlichen Wand des Wasserbalkens 4 erfolgen, oder natürlich auch an der unteren Fläche im Bereich der Düsen 5. Dies hat den Vorteil, dass die Auslaufkante 14a sehr gut mit dem Wasserstrahl 6 ausgerichtet werden kann. Die seitliche Befestigung 15 am Wasserbalken 4 kann unter anderem auch eine Höhenverstellbarkeit aufweisen, so dass über die Federwirkung des geraden oder gebogenen Kompaktierbleches 14 der Druck auf die Faserbahn 2 einstellbar ist. In diesem Ausführungsbeispiel wird die Faserbahn 2 von links nach rechts transportiert. Im Bereich des Düsenbalkens 4 erfolgt die Kompaktierung durch das Kompaktierblech 14 dicht vor dem Wasserstrahl 6, wodurch verhindert wird, dass die Faserbahn 2 in größeren Bereichen vor der Reihe der Wasserstrahlen 6 bzw. durch den Unterdruck in das Saugrohr 3b gesaugt wird und sich die Faserbahn dabei verformt. Das Kompaktierblech 14 kann durch die Kompaktierwirkung kurz vor der Verfestigung durch die Wasserstrahlen 6 die Festigkeit in Längsrichtung der Faserbahn 2 erhöhen, da die Auslaufkante 14a nur über die Oberfläche der Faserbahn 2 gleitet. Über den gesamten Querschnitt der Faserbahn 2 findet hingegen keine Änderung in der Ausrichtung der Fasern statt. Nur der Teilbereich oder Streifen der Faserbahn 2 zwischen dem Kompaktierblech 14 und den Wasserstrahlen 6 wird gedehnt und die Fasern miteinander verschlungen. Bei hohen Geschwindigkeiten staut sich die durch die Faserbahn 2 mitgeschleppte Luft am Kompaktierblech 14 auf. Dadurch wird ein Teil der Luftströmung seitlich vom Endlosband 7 abgelenkt. Ein anderer Teil der Luftströmung dringt durch die Faserbahn 2 hindurch, staut sich auf und erzeugt Verwerfungen in der Faserbahn 2, die kurz vor dem Kompaktierblech 14 vom Endlosband 7 abheben kann.In Figure 1 A solidification system 1 according to the prior art is shown, which essentially comprises an endless belt 7 or alternatively a drum with at least one water bar 4. The endless belt 7 can be designed as a sieve belt to drain the water quickly. Below the endless belt 7, in the area of the nozzle 5, a suction pipe 3b is shown as a rectangular box, which likewise has at least one suction slot 3c. According to this embodiment, the compacting plate 14 can be arranged directly on the water bar 4 and be attached. The attachment 15 in the area of the rear edge of the compacting plate 14 can be carried out on a side wall of the water bar 4, or of course also on the lower surface in the area of the nozzles 5. This has the advantage that the outlet edge 14a is very well aligned with the water jet 6 can be. The lateral attachment 15 to the water bar 4 can also have a height adjustment, among other things, so that the pressure on the fiber web 2 can be adjusted via the spring action of the straight or curved compacting plate 14. In this embodiment, the fibrous web 2 is transported from left to right. In the area of the nozzle bar 4, the compacting is carried out by the compacting plate 14 close to the water jet 6, which prevents the fiber web 2 from being sucked in larger areas in front of the row of water jets 6 or from the vacuum into the suction pipe 3b and the fiber web from becoming entangled deformed in the process. The compacting plate 14 can increase the strength in the longitudinal direction of the fibrous web 2 due to the compacting action shortly before solidification by the water jets 6, since the trailing edge 14a only slides over the surface of the fibrous web 2. In contrast, there is no change in the orientation of the fibers over the entire cross section of the fiber web 2. Only the portion or strip of the fiber web 2 between the compacting plate 14 and the water jets 6 is stretched and the fibers are intertwined. At high speeds, the air entrained by the fiber web 2 builds up on the compacting plate 14. As a result, part of the air flow is laterally deflected by the endless belt 7. Another part of the air flow penetrates through the fiber web 2, builds up and creates warps in the fiber web 2, which can lift off the endless belt 7 shortly before the compacting plate 14.

Die Erfindung sieht in den nachfolgenden Ausführungsbeispielen vor, die Luftströmung oberhalb und/oder unterhalb der Faserbahn 2 abzuführen bzw. abzuleiten. Hierzu kann vor oder unterhalb des Kompaktierbleches 14 eine Ableitvorrichtung zur Abführung oder Ableitung der mitgeschleppten Luft angeordnet sein. Die Ableitvorrichtung kann als Walze mit mindestens einer Öffnung ausgebildet sein, über die die Luft seitlich abgeführt wird. Dabei kann die Walze gleichzeitig die Faserbahn 2 auf dem Endlosband 7 oder auf einer Trommel kompaktieren. Die Ableitvorrichtung kann aber auch unterhalb des Kompaktierbleches angeordnet und ausgebildet sein, die Luftströmung abzuleiten. Vorzugsweise kann die Ableitvorrichtung mit einem Unterdruck beaufschlagt werden oder strömungstechnisch so ausgebildet sein, dass sich ein Unterdruck an der Einströmöffnung der Ableitvorrichtung bildet. Je nach Anlagenkonfiguration kann es sinnvoll sein, die Ableitvorrichtung im Bereich eines Ablagebandes vor dem Endlosband 7 oder der Trommel 3 anzuordnen, wenn gerade hier die Platzverhältnisse so ausgebildet sind, dass die Luftströmung seitlich oder oberhalb der Anlage günstig abzuführen sind. Dabei muss darauf geachtet werden, dass sich nicht hinter der Ableitvorrichtung eine neue Luftströmung bildet. Insofern kann eine Anordnung der Ableitvorrichtung in einem Abstand von maximal 2 m vor dem Kompaktierblech sinnvoll sein, egal ob im Bereich des gleichen Endlosbandes 7 oder einer vorgeschalteten nicht dargestellten Komponente.In the following exemplary embodiments, the invention provides for the air flow to be discharged above and / or below the fiber web 2 or derive. For this purpose, a discharge device for removing or discharging the entrained air can be arranged in front of or below the compacting plate 14. The discharge device can be designed as a roller with at least one opening through which the air is discharged laterally. The roller can simultaneously compact the fiber web 2 on the endless belt 7 or on a drum. However, the diverter can also be arranged and designed below the compacting plate to diverge the air flow. A vacuum can preferably be applied to the discharge device, or it can be designed in terms of flow technology so that a vacuum is formed at the inlet opening of the discharge device. Depending on the system configuration, it may make sense to arrange the discharge device in the area of a storage belt in front of the endless belt 7 or the drum 3, if the space conditions here are such that the air flow can be carried away cheaply to the side or above the system. Care must be taken to ensure that a new air flow does not form behind the discharge device. In this respect, an arrangement of the discharge device at a maximum distance of 2 m in front of the compacting plate can be useful, regardless of whether in the area of the same endless belt 7 or an upstream component, not shown.

In dem ersten Ausführungsbeispiel der Figur 2 ist oberhalb des Endlosbandes 7 unmittelbar vor dem Kompaktierblech 14 eine Ableitvorrichtung in Form einer Absaugung angeordnet, die als Walze 8 20 ausgebildet ist. Die Walze 8 weist eine Vielzahl von Öffnungen auf, die auf dem Umfang des Zylindermantels verteilt sind, in die die Luftströmung eindringt und seitlich abgeführt wird. Soll die Walze 8 besaugt werden, ist diese als Saugwalze 22 ausgebildet und wird mit einem leichten Unterdruck von bis zu 0,3 bar (0,7 bar absolut) beaufschlagt und leitet die durch die Faserbahn 2 mitgeschleppte Luftströmung ab. Die Walze 8 bzw. Saugwalze 20 ist kann oberhalb der Faserbahn 2 mit einem kleinen Spalt von 0,5 bis 5 mm angeordnet sein und keinen Druck auf die Faserbahn 2 ausüben. In diesem Ausführungsbeispiel ist die Walze 8 bzw. Saugwalze 20 nicht angetrieben und ist daher feststehend. Sie kann verschwenkbar angeordnet sein, um das Anlaufen der Anlage zu erleichtern und um Wartungsarbeiten am Wasserbalken 4 zu erleichtern.In the first embodiment of the Figure 2 a discharge device in the form of a suction device is arranged above the endless belt 7 directly in front of the compacting plate 14 and is designed as a roller 8 20. The roller 8 has a multiplicity of openings which are distributed over the circumference of the cylinder jacket, into which the air flow penetrates and is discharged laterally. If the roller 8 is to be vacuumed, it is designed as a suction roller 22 and is subjected to a slight negative pressure of up to 0.3 bar (0.7 bar absolute) and diverts the air flow carried along by the fiber web 2. The roller 8 or Suction roller 20 can be arranged above the fibrous web 2 with a small gap of 0.5 to 5 mm and can exert no pressure on the fibrous web 2. In this embodiment, the roller 8 or suction roller 20 is not driven and is therefore stationary. It can be arranged to be pivotable in order to facilitate the start-up of the system and to facilitate maintenance work on the water bar 4.

Soll die Walze 8 oder Saugwalze 20 eine Kompaktierfunktion ausüben, kann in einer weiteren Ausführungsform die Walze 8 bzw. Saugwalze 20 mit dem Endlosband 7 die Faserbahn 2 kompaktieren. Alternativ kann unterhalb des Endlosbandes 7 eine Druckwalze 21 angeordnet sein, die zusammen mit der Walze 8 bzw. Saugwalze 20 die Faserbahn 2 kompaktiert. In diesem Ausführungsbeispiel liegt die Walze 8 bzw. Saugwalze 20 auf der Faserbahn 2 mit dem Endlosband 7 auf, wobei durch die Druckwalze 21 ein Gegendruck erzeugt wird. Beide Walzen 8 oder 20 und 21 drehen sich mit der gleichen Umfangsgeschwindigkeit, die vorzugsweise der Transportgeschwindigkeit der Faserbahn entspricht, um keinen Verzug zu erzeugen. Statt der Druckwalze 21 kann auch eine Umlenkwalze des Endlosbandes 7 verwendet werden, sofern diese nahe im Bereich des Kompaktierbleches 14 angeordnet ist. Figur 2 zeigt den Abstand X zwischen der Ableitvorrichtung (Walze 8 oder Saugwalze 20) und der Auslaufkante 14a des Kompaktierbleches 14, der maximal 2 m beträgt.If the roller 8 or suction roller 20 is to perform a compacting function, in a further embodiment the roller 8 or suction roller 20 can compact the fiber web 2 with the endless belt 7. Alternatively, a pressure roller 21 can be arranged below the endless belt 7, which compacted the fiber web 2 together with the roller 8 or suction roller 20. In this exemplary embodiment, the roller 8 or suction roller 20 rests on the fibrous web 2 with the endless belt 7, counter pressure being generated by the pressure roller 21. Both rollers 8 or 20 and 21 rotate at the same peripheral speed, which preferably corresponds to the transport speed of the fiber web, so as not to produce any distortion. Instead of the pressure roller 21, a deflection roller of the endless belt 7 can also be used, provided that it is arranged close to the area of the compacting plate 14. Figure 2 shows the distance X between the discharge device (roller 8 or suction roller 20) and the outlet edge 14a of the compacting plate 14, which is a maximum of 2 m.

In Figur 3 ist die Walze 8 bzw. Saugwalze 20 als mitdrehende Kompaktierwalze ausgebildet, die zusammen mit dem Endlosband 7 die Faserbahn 2 kompaktiert. Auch hier ist vorzugsweise die Umfangsgeschwindigkeit der Walze 8 bzw. Saugwalze 20 identisch mit der Transportgeschwindigkeit der Faserbahn 2. Die Walze 8 bzw. Saugwalze 20 ist dabei so ausgebildet, dass diese unter die horizontale Ebene des Endlosbandes 7 verschwenkt werden kann und damit einen Druck auf die Faserbahn 2 und das Endlosband 7 ausübt.In Figure 3 the roller 8 or suction roller 20 is designed as a rotating compacting roller which, together with the endless belt 7, compresses the fiber web 2. Here, too, the peripheral speed of the roller 8 or suction roller 20 is preferably identical to the transport speed of the fibrous web 2. The roller 8 or suction roller 20 is designed such that it can be pivoted below the horizontal plane of the endless belt 7 and thus a pressure on it the fiber web 2 and the endless belt 7 exercises.

Figur 4 zeigt eine Ableitvorrichtung der Luftströmung oberhalb der Faserbahn 2, bei der eine Absaughaube 22 oberhalb des Endlosbandes 7 angeordnet ist und die mit der Faserbahn 2 mitgerissene Luftströmung abführt. Die Absaughaube 22 ist im Wesentlichen im Querschnitt als zylindrisches Rohr ausgebildet, das sich über die Arbeitsbreite des Endlosbandes 7 erstreckt. Entlang der Längsachse der Absaughaube 22 ist der Mantel des Rohres zu einer Öffnung aufgeschlitzt und aufgebogen, so dass sich hier ein größerer Durchmesser ergibt, als der ursprüngliche Innendurchmesser. Die Öffnung der Absaughaube 22 erstreckt sich ebenfalls über die gesamte Arbeitsbreite des Endlosbandes und nimmt die durch die Faserbahn 2 mitgerissene Luftströmung auf. Es ergibt sich ein tangentialer Einlauf, der zu einer drallförmigen Strömung innerhalb der Absaughaube 22 führt, wodurch die Luftströmung ohne Anlegen eines Unterdruckes seitlich abgeführt werden kann. Vorteilhafterweise kann die Absaughaube 22 im Abstand zum Endlosband eingestellt werden, und um den Aufhängepunkt verdreht werden, um die Öffnung zur Luftströmung zu positionieren. Natürlich können mehrere Absaughauben 22 hintereinander vor dem Wasserbalken 4 angeordnet sein, wobei die Anordnung mit versetzten Abständen zur Faserbahn 2 erfolgen kann. Selbstverständlich kann die mindestens eine Absaughaube 22 auch aktiv besaugt werden. Figure 4 shows a diverter of the air flow above the fiber web 2, in which a suction hood 22 is arranged above the endless belt 7 and discharges the air flow entrained with the fiber web 2. The suction hood 22 is essentially designed in cross section as a cylindrical tube that extends over the working width of the endless belt 7. Along the longitudinal axis of the suction hood 22, the jacket of the tube is slit open and bent to an opening, so that here a larger diameter results than the original inner diameter. The opening of the suction hood 22 also extends over the entire working width of the endless belt and absorbs the air flow entrained by the fiber web 2. The result is a tangential inlet, which leads to a swirling flow within the suction hood 22, as a result of which the air flow can be discharged laterally without applying a vacuum. The suction hood 22 can advantageously be set at a distance from the endless belt and rotated around the suspension point in order to position the opening for the air flow. Of course, several suction hoods 22 can be arranged one behind the other in front of the water bar 4, it being possible for the arrangement to be at offset distances from the fiber web 2. Of course, the at least one suction hood 22 can also be actively vacuumed.

Figur 5 zeigt eine Ableitvorrichtung in Form eines Absaugkastens 23, der unterhalb des Endlosbandes 7 unterhalb des Kompaktierbleches 14 angeordnet ist und separat von dem Saugrohr 3b für die Wasserstrahlen 6 mit einem Unterdruck (Δp) versehen sein kann. Da sich die durch die Faserbahn 2 mitgerissene Luftströmung vor dem Kompaktierblech 14 staut und zumindest teilweise durch die Faserbahn 2 und das Endlosband 7 strömt, erzeugt der Saugkasten 23 mit seinem Unterdruck eine Ausrichtung der Luftströmung, mit der die Faserbahn 2 ohne Verwerfung auf dem Endlosband 7 bleibt. In diesem Ausführungsbeispiel ist der Saugkasten 23 von dem Saugrohr 3b getrennt, wodurch das Wasser und die Luft separat abgeführt werden können. Weiterhin zeigt diese Ausführungsform eine schräg zum Endlosband 7 angeordnete Absaugöffnung 23a, in die die Faserbahn durchströmende Luftströmung senkrecht einläuft. Figure 5 shows a discharge device in the form of a suction box 23, which is arranged below the endless belt 7 below the compacting plate 14 and can be provided separately from the suction pipe 3b for the water jets 6 with a negative pressure (Δp). Since the air flow entrained by the fiber web 2 accumulates in front of the compacting plate 14 and at least partially flows through the fiber web 2 and the endless belt 7, the suction box 23 generates an alignment of the air flow with its negative pressure, with which the fiber web 2 without warping on the endless belt 7 remains. In this embodiment, the suction box 23 is separated from the suction pipe 3b, whereby the water and the air can be discharged separately. Furthermore, this embodiment shows a suction opening 23a arranged obliquely to the endless belt 7, into which the air flow flowing through the fiber web runs vertically.

Diese Variante eignet sich insbesondere zum Nachrüsten unter eine bestehende Verfestigungsanlage 1.This variant is particularly suitable for retrofitting under an existing consolidation system 1.

Figur 6 zeigt eine Absaugöffnung 3d für die die Faserbahn 2 durchströmende Luftströmung, die in das Saugrohr 3b integriert ist. Die Absaugöffnung 3d ist dabei in Arbeitsrichtung vor dem Kompaktierblech 14 angeordnet und kann eine von dem Absaugschlitz 3c unabhängige Absaugung aufweisen. Figure 6 shows a suction opening 3d for the air flow flowing through the fiber web 2, which is integrated in the suction pipe 3b. The suction opening 3d is arranged in front of the compacting plate 14 in the working direction and can have a suction independent of the suction slot 3c.

Figur 7 zeigt eine Ausführungsform mit einer besaugten Trommel 3. Die Trommel 3 kann als sogenannte Siebtrommel ausgebildet sein, umfassend eine Lochblechtrommel, die mit einem Stützgewebe und einem feinen Sieb oder alternativ mit einer mikroporösen Schale bezogen ist. Alternativ kann die Trommel als Strukturtrommel ausgebildet sein, deren Oberfläche eine Perforierung aufweist, um der Faserbahn 2 eine Struktur oder ein Muster zu geben. Figure 7 shows an embodiment with a vacuumed drum 3. The drum 3 can be designed as a so-called sieve drum, comprising a perforated plate drum, which is covered with a support fabric and a fine sieve or alternatively with a microporous shell. Alternatively, the drum can be designed as a structure drum, the surface of which has a perforation in order to give the fiber web 2 a structure or a pattern.

Die Trommel 3 weist eine Vielzahl von Bohrungen 3a auf, über die das Wasser des Wasserbalkens 4 abgeführt wird. Innerhalb der Trommel 3 ist ein Saugrohr 3b mit einer Vielzahl von Absaugschlitzen 3c angeordnet, über die das Wasser mit Unterdruck abgesaugt wird. Oberhalb der Trommel 3 ist der Wasserbalken 4 angeordnet, der unter Hochdruck mittels einer Vielzahl von Düsen 5 eine Reihe von Wasserstrahlen 6 auf die Faserbahn 2 spritzt. Der Wasserbalken 4 wird mit einem Druck von 10 bis 100 bar, vorzugsweise mit einem Druck von 20 bis 40 bar betrieben. Der Düsenbalken 4 kann mit einer oder mehreren Reihen von Wasserstrahlen 6 betrieben werden. Die Düsen 5 sind entlang der Längsachse des Wasserbalkens 4 angeordnet. Aus Gründen der Übersichtlichkeit ist nur eine Reihe von Wasserstrahlen 6 dargestellt. Die Faserbahn 2 läuft in diesem Ausführungsbeispiel in Pfeilrichtung von links nach rechts über die Trommel 3 und wird kontinuierlich von den Wasserstrahlen 6 getroffen. Der Wasserbalken 4 ist dabei im Abstand zur Trommel 3 bzw. zur Endlosbahn einstellbar angeordnet. Das Kompaktierblech 14 kann an einer drehbaren Aufhängung 11 befestigt sein, mit der das Kompaktierblech 14 in eine bestehende Anlage nachgerüstet werden kann.The drum 3 has a multiplicity of bores 3a, through which the water of the water bar 4 is discharged. Arranged inside the drum 3 is a suction pipe 3b with a multiplicity of suction slots 3c, via which the water is sucked off under reduced pressure. The water bar 4 is arranged above the drum 3 and sprays a series of water jets 6 onto the fiber web 2 under high pressure by means of a plurality of nozzles 5. The water bar 4 is operated at a pressure of 10 to 100 bar, preferably at a pressure of 20 to 40 bar. The nozzle bar 4 can be operated with one or more rows of water jets 6. The nozzles 5 are arranged along the longitudinal axis of the water bar 4. Because of Only a number of water jets 6 are shown for clarity. In this exemplary embodiment, the fibrous web 2 runs in the direction of the arrow from left to right over the drum 3 and is continuously hit by the water jets 6. The water bar 4 is arranged adjustable at a distance from the drum 3 or the endless web. The compacting plate 14 can be fastened to a rotatable suspension 11 with which the compacting plate 14 can be retrofitted into an existing system.

In Arbeitsrichtung vor der Trommel 3 ist eine Ableitvorrichtung in Form eines Absaugkastens 23 angeordnet, dessen Kontur sich mit der Absaugöffnung 23a dem Verlauf der Faserbahn 2 anpasst. Um den Abstand zur Trommel 3 zu reduzieren, kann die der Trommel 3 zugeordnete Außenwand ebenfalls konturiert ausgebildet sein. Die durch die Transportgeschwindigkeit der Faserbahn 2 entstehende Luftströmung wird in diesem Fall durch den Absaugkasten 23 abgesaugt, so dass vor dem Kompaktierblech 14 die Faserbahn 2 nicht aufgeworfen wird. Bis auf das Ausführungsbeispiel der Figur 6 sind alle beschriebenen und dargestellten Varianten einer ober- oder unterhalb angeordneten Abführung der Luftströmung auch bei der Trommel 3 möglich.Arranged in the working direction in front of the drum 3 is a discharge device in the form of a suction box 23, the contour of which adjusts to the course of the fiber web 2 with the suction opening 23a. In order to reduce the distance to the drum 3, the outer wall assigned to the drum 3 can also be designed with a contour. In this case, the air flow resulting from the transport speed of the fiber web 2 is sucked off through the suction box 23, so that the fiber web 2 is not thrown up in front of the compacting plate 14. Except for the embodiment of Figure 6 all described and illustrated variants of a discharge of the air flow arranged above or below are also possible with the drum 3.

Bezugszeichenreference numeral

11
Verfestigungsanlagebonding system
22
Faserbahnfiber web
33
Trommeldrum
3a3a
Bohrungdrilling
3b3b
Saugrohrsuction tube
3c3c
Absaugschlitzsuction slot
3d3d
Absaugöffnungsuction
44
Wasserbalkenwater beam
55
Düsejet
66
Wasserstrahlwaterjet
77
Endlosbandendless belt
88th
Walzeroller
1111
Aufhängungsuspension
1414
KompaktierblechKompaktierblech
14a14a
Auslaufkantedischarge edge
1515
Befestigungattachment
2020
Saugwalzesuction roll
2121
Druckwalzeplaten
2222
Absaughaubeexhaust hood
2323
Absaugkastensuction
23a23a
Absaugöffnungsuction
XX
Abstanddistance

Claims (13)

  1. A device for hydro-dynamically entangling nonwovens, woven fabrics or knitted fabrics, comprising an entangling installation (1) including at least one water bar (4) and a drum (3) or an endless belt (7), between which a fibre web (2) is transported and entangled, wherein, in travelling direction of the fibre web (2) upstream the water bar (4), is disposed a compacting plate (14), which condenses the fibre web (2) on the drum (3) or the endless belt (7), characterized in that, in travelling direction of the fibre web (2) upstream the compacting plate (14), at least one diverting device is disposed above and/or below the fibre web (2), by means of which device the air entrained by the fibre web (2) is diverted.
  2. The device according to claim 1, characterized in that the at least one diverting device is configured as a roll (8), which includes at least one opening for diverting the entrained air.
  3. The device according to claim 2, characterized in that the at least one diverting device includes a perforation or is configured as a perforated sheet metal roll.
  4. The device according to any of the preceding claims, characterized in that the at least one diverting device is disposed above the fibre web (2) and cooperates with the endless belt (7) or with a pressure roll (21) or deflector roll for the endless belt (7) and is formed for compacting the fibre web (2).
  5. The device according to any of the claims 1 to 4, characterized in that the at least one diverting device is formed as a suction roll (20).
  6. The device according to claim 5, characterized in that the roll (8), respectively the suction roll (20) is disposed spaced apart from the fibre web (2).
  7. The device according to claim 1 or 2, characterized in that the at least one diverting device is formed as a suction hood (22), into which the airflow tangentially enters, which is entrained by the fibre web (2).
  8. The device according to claim 1, characterized in that the at least one diverting device is formed as a suction box (23), which is disposed below the fibre web (2) and which exerts an underpressure onto the fibre web (2).
  9. The device according to claim 1, characterized in that the at least one diverting device is formed as a suction opening (3d), which is incorporated into the suction pipe (3b) for the water jets (6).
  10. The device according to claim 8, characterized in that the at least one suction box (23) includes at least one exterior side, which adapts to the contour of the drum (3) and/or to the course of the fibre web (2).
  11. The device according to any of the preceding claims, characterized in that the at least one suction (3d, 20, 22, 23) is suctionable at an underpressure of up to 0.3 bar.
  12. The device according to any of the preceding claims, characterized in that, in operating direction, the at least one diverting device is disposed directly upstream the compacting plate (14).
  13. The device according to claim 11, characterized in that the distance (X) between the at least one diverting device and the exit edge (14a) of the compacting plate (14) amounts to a maximum of 2 m in transporting direction of the fibre web (2).
EP18200089.3A 2017-12-08 2018-10-12 Device for hydro-needling nonwoven fabrics, tissues or knitted fabrics Active EP3495544B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017129220.9A DE102017129220A1 (en) 2017-12-08 2017-12-08 Device for the hydrodynamic consolidation of nonwovens, woven or knitted fabrics

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EP3495544A1 EP3495544A1 (en) 2019-06-12
EP3495544B1 true EP3495544B1 (en) 2020-02-05

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DE (1) DE102017129220A1 (en)

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Publication number Priority date Publication date Assignee Title
CN112301579B (en) * 2020-10-21 2023-12-22 江苏昱昊新材料有限公司 Non-woven fabric processing of steerable water yield is with device of wetting
CN112609337B (en) * 2020-12-31 2024-07-02 龙南小麦自动化科技有限公司 High-pressure water jet equipment for melt-blown cloth

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FR2845698B1 (en) * 2002-10-11 2005-03-18 Rieter Perfojet PROCESS AND INSTALLATION FOR PRODUCING A NON-WOVEN HAVING GOOD PROPERTIES OF TENSILE STRENGTH
DE102005033070A1 (en) * 2005-07-15 2007-01-25 Fleissner Gmbh Apparatus for strengthening a fibrous web comprises a water-delivering compression roller, a fiber-entangling spray bar and a water-jet needling drum
DE102006030804B4 (en) * 2005-09-03 2007-10-31 Fleissner Gmbh Device with a suction chamber for a water beam for the jet exposure of tissues
US20100159775A1 (en) * 2008-12-19 2010-06-24 Chambers Jr Leon Eugene Nonwoven Composite And Method For Making The Same
CN101858015A (en) * 2009-04-08 2010-10-13 欧瑞康纺织有限及两合公司 The method and apparatus that is used for the fiber web duse process
DE102013101431B4 (en) 2013-02-13 2016-06-23 TRüTZSCHLER GMBH & CO. KG Apparatus and method for the hydrodynamic consolidation of nonwovens, fabrics and knitted fabrics
DE102013110915A1 (en) * 2013-10-01 2015-04-02 Trützschler GmbH & Co Kommanditgesellschaft Vorverdichter for smoothing or compacting a sliver in a winding machine, winding machine and method for operating a winding machine
DE102015111340A1 (en) * 2015-07-14 2017-01-19 TRüTZSCHLER GMBH & CO. KG Plant and method for producing a multi-layer nonwoven fabric from at least one unconsolidated batt
CN105970657B (en) * 2016-06-30 2018-01-05 山东大学 A kind of preparation method of spun lacing regenerated leather for automotive trim epidermis
CN107022842A (en) * 2017-05-08 2017-08-08 大连华纶无纺设备工程有限公司 Double-mold-head is combined interlacing two-component spunbonded water-jet bonding non-woven fabrics production equipment and production technology

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EP3495544A1 (en) 2019-06-12
CN109898233A (en) 2019-06-18
CN109898233B (en) 2022-04-01

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