EP4067549B1 - Installation et procédé de consolidation des couches comprenant des fibres en une bande de non-tissé - Google Patents

Installation et procédé de consolidation des couches comprenant des fibres en une bande de non-tissé Download PDF

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Publication number
EP4067549B1
EP4067549B1 EP22163582.4A EP22163582A EP4067549B1 EP 4067549 B1 EP4067549 B1 EP 4067549B1 EP 22163582 A EP22163582 A EP 22163582A EP 4067549 B1 EP4067549 B1 EP 4067549B1
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EP
European Patent Office
Prior art keywords
layer
belt
production
circulating belt
layers
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Application number
EP22163582.4A
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German (de)
English (en)
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EP4067549A1 (fr
Inventor
Jean-Michel Ugnon-Coussioz
Dennis Latendorf
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Andritz Kuesters GmbH
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Andritz Kuesters GmbH
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Publication of EP4067549A1 publication Critical patent/EP4067549A1/fr
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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
    • D04H5/00—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length
    • D04H5/02—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length strengthened or consolidated by mechanical methods, e.g. needling
    • D04H5/03—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length strengthened or consolidated by mechanical methods, e.g. needling by fluid jet
    • 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
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/498—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres entanglement of layered webs
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C11/00—Teasing, napping or otherwise roughening or raising pile of textile fabrics
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/02—Carding machines
    • D01G15/12—Details
    • D01G15/46—Doffing or like arrangements for removing fibres from carding elements; Web-dividing apparatus; Condensers
    • D01G15/64—Drafting or twisting apparatus associated with doffing arrangements or with web-dividing apparatus
    • 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
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/48—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation
    • D04H1/49—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation entanglement by fluid jet in combination with another consolidation means
    • 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
    • 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
    • D04H1/74—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 orientated, e.g. in parallel (anisotropic fleeces)
    • 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
    • D04H5/00—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length
    • 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
    • D04H5/00—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length
    • D04H5/08—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of fibres or yarns

Definitions

  • the invention relates to a system for bonding a layer comprising short fibers with a layer comprising long fibers to form a fleece web, with a first circulating belt on which the layer comprising long fibers can be deposited and displaced in a production direction, and with a second circulating belt by means of which the Short fiber comprehensive layer can be transferred to a transfer point to the long fiber comprehensive layer.
  • the invention also relates to a method for producing a nonwoven web which has a layer comprising short fibers and a layer comprising long fibers.
  • Such a device and such a method are from EP 3 283 679 B1 known. Due to the effect of a deflection roller, the two layers are pre-compacted at the transfer point before they reach an area between the first and the second band in the direction of production, in which the two bands are at a distance that is greater than the sum of the thickness of the two layers. There is therefore no compaction in this area.
  • U.S. 2002/157766 A1 and WO 2004/06341 A1 disclose systems for bonding a layer comprising short fibers with a layer comprising long fibers to form a nonwoven web, using a pre-strengthening unit.
  • the invention is therefore based on the object of creating a system and a method by means of which the reproducibility of the production result is improved.
  • the system and the method should be suitable for the production of a nonwoven web, in which a layer comprising light short fibers, e.g. with a weight per unit area between 10 and 50 grams per square meter, e.g can have a basis weight of between 15 and 50 grams per square meter is applied and consolidated with it.
  • This production regularly causes difficulties, since carded layers comprising long fibers often have elastic properties and show recovery effects after compaction, which can result in deformations, defects and even cracks in the wood fiber layer.
  • the nonwoven web produced can, for example, have a basis weight of between 20 and 150, preferably between 40 and 70 grams per square meter.
  • the plant according to the invention comprises a pre-consolidation unit arranged directly behind the transfer point in the direction of production. “Immediately behind” is to be understood to mean that between the transfer point and the pre-consolidation unit there are no further devices that bring about compaction and/or consolidation of the two layers.
  • preconsolidation unit is intended to make it clear that the components belonging to it are functionally inseparable.
  • the pre-consolidation unit has two compacting devices that are spaced apart from one another in the direction of production. With these, a distance between the second band and the first band, which preferably runs parallel thereto, can be reduced to a value in an area that is smaller than the sum of the thicknesses of the two layers, whereby the two layers due to an in the area compressive force acting on them over a large area.
  • the two belts can also contact each other in this area, in other words the distance can assume the value zero if no layer passes the pre-consolidation unit.
  • the belts When passing through one or more layers, the belts can again assume a distance in this area due to the flexibility of at least one of the belts without a displacement of the pre-consolidation unit being absolutely necessary for this purpose.
  • the two compacting devices can either both act on one and the same of the first and second band. Or one of the two compactors acts on one band and the other of the two compactors acts on the other band.
  • the pre-consolidation unit also comprises a consolidation device arranged between the compaction devices, in particular a water-jet compaction device, by means of which the two layers can be consolidated by swirling the fibers together.
  • the compacting device is preferably designed in such a way that the turbulence of the fibers is not achieved over the entire area in which the compaction also takes place, but only in a partial area, in particular linearly by means of a nozzle bar extending transversely to the production direction.
  • the compacting device and the solidification device are also integrated into the system according to the invention in such a way that they are always in the operating state together when the layer comprising short fibers is transferred by the second circulating belt.
  • a first preferred embodiment of a plant according to the invention comprises a pre-consolidation unit, in which the compacting devices each comprise a pressure roller.
  • the production costs of a system according to the invention can be reduced without restricting its functionality if—as in a second embodiment—the compacting devices of the preconsolidation unit each include a pressure bar.
  • the compacting devices of the pre-consolidation unit can be arranged in such a way that in the operating state they bear against the first belt and preferably move it parallel to the second belt in the area in which the pre-consolidation unit acts.
  • the pre-consolidation unit is designed in such a way that the compacting devices bear against the second band and preferably move it parallel to the first band.
  • the compacting devices are therefore arranged inside the second circulating belt.
  • the guidance of the second belt is preferably selected in such a way that the distance between the line extending transversely to the direction of production, along which the second belt first touches the outer circumference of the pressure roller, to the upper side of the first band corresponds at least to the thickness of the fiber layers. Typically this distance is 15 mm, 20 mm or more. Due to this configuration, an undesirable compacting of the layers before the transfer point is avoided.
  • lower rollers around which the second belt rotates are arranged. Due to this measure, an improvement in the guidance of the second band is achieved, which can improve the pre-consolidation process that can be achieved with the system according to the invention.
  • An embodiment is particularly preferred in which the lower rollers are arranged in such a way that the second belt has an inlet angle ⁇ of between 1° and 10° and an outlet angle ⁇ ′ of greater than 1° relative to the first belt between the lower rollers and the compacting devices adjacent to them . It has been shown that a particularly good result can be achieved with the pre-consolidation unit with an inlet angle in this size range, but the size of the outlet angle is only of minor importance for the result.
  • the first compacting device viewed in the production direction, acts from above against the lower run of the second circulating belt
  • the second compacting device viewed in the production direction, acts from below against the upper run of the first circulating belt in such a way that the first circulating belt Passing the second compacting device undergoes a change of direction.
  • the change in direction is preferably at least 1°.
  • the first compacting device comprises a first lower pressure roller.
  • the second compacting device comprises a suction chamber to which a negative pressure can be applied. The tendency for the pre-consolidated layers to stick to the second circulating belt can then again be substantially reduced.
  • the suction chamber then preferably comprises at least one contact surface for the first circulating belt, and furthermore preferably a suction opening.
  • the second compacting device comprises a pressure roller, which can be designed in an identical manner to the first lower pressure roller.
  • a suction chamber is preferably provided in the production direction—preferably directly behind the pressure roller.
  • the pressure roller is designed as a suction roller, by means of which an air flow can be generated through the first circulating belt.
  • the hydroentanglement device is preferably designed as a nozzle bar which emits water jets with diameters which are typically between 80 and 180 micrometers.
  • the water beam is connected to a pressure source, by means of which water can be supplied under a pressure that can be up to 100 bar, but is usually significantly lower, for example, is a maximum of 30 bar or lower, depending on the properties of the short and requirements influenced by long fibers for pre-consolidation.
  • the nozzle beam is preferably arranged within the second band, particularly preferably together with the two compacting devices, and is—particularly preferably—at the same distance from them as seen in the direction of production.
  • the layer comprising short fibers is applied to the layer comprising long fibers and the two layers are then compacted by means of mechanical pressure acting over a length region of the two layers.
  • the two layers are strengthened together by means of water jets, which act in part of this length range. It has been shown that due to this measure, a particularly effective pre-consolidation of the two layers is achieved without this resulting in an undesired detachment of short fibers in particular.
  • the water jets are particularly preferably directed onto the layer comprising short fibers. It has been shown that the pre-consolidation is particularly effective due to this measure and at the same time the water can easily be collected under the effect of a vacuum by means of a suction box and returned to the process.
  • the first embodiment of the system according to the invention (system 100), designated as a whole with 100, comprises a carding unit 1, with which a layer of long fibers can be produced. It comprises a circulating deposit belt 2 with an upper strand 3 on which the long fibers can be deposited in the form of a layer 5 comprising the long fibers 4 .
  • the system 100 also includes a suction roller 6, with which the layer 5 can be transferred to an upper strand 7 of a first belt 8 circulating around rollers 9 in a clockwise direction.
  • the upper run 7 moves towards the in 1 drawn arrow, which thus symbolizes the production direction P.
  • the first circulating belt 8 is designed to be permeable to liquids and gases, for example as a screen belt.
  • the system 100 further comprises a device 11 for providing a layer 13 comprising short fibers 12.
  • the device 11 comprises a second circulating belt 14, which circulates counterclockwise around rollers 15.
  • the second circulating belt 14 is in turn designed to be permeable to liquids and gases, for example as a screen belt. Due to the arrangement of the rollers 15, it forms a region 16 that rises as seen in the direction of rotation, in which the short fibers 12 are deposited from a headbox 17—for example as an aqueous emulsion—to form the layer 13.
  • a headbox 17 for example as an aqueous emulsion
  • the layer 13 comprising short fibers 12 arrives at a lower strand 20 of the second circulating belt 14 via regions 18 , 19 , which fall obliquely in relation to the direction of rotation.
  • the lower strand 20 is formed between two lower rollers 21 .
  • the lower rollers 21, 21 form compacting devices 10, 10 'and are part of a pre-consolidation unit 22. You are in operation of the system 100 relative to the upper run 7 of the first circulating belt 8 in a position in which the distance between the lower strand 20 of the second circulating belt 14 and the upper strand 7 of the first circulating belt 8 is smaller than the sum of the thicknesses of the layers 5 and 13.
  • At least the first roller 21 in the direction of production has a diameter D. It is greater than or equal to one twentieth of the length of the printing roller across the direction of production.
  • the guidance of the second band is chosen so that it extends transversely to the direction of production Line along which the second band touches the outer circumference of the roll 21 first, has a distance A which corresponds at least to the sum of the thicknesses of the layers 13 and 5.
  • the layer 13 is transferred to the layer 5 due to the arrangement of the rollers 15 and the lower rollers 21 at a transfer point Ü, which is seen in the production direction P in front of the lower roller 21 shown on the left in the drawing. Since the distance between the upper run 7 and the lower run 20 is smaller than the sum of the thicknesses of the two layers 5 and 13, the two layers experience a first areal compaction on the way to formation when they pass the area between the two lower rollers 21 a flow path 23. The size of the area depends on the distance between the two lower rollers 21 in the production direction P.
  • the first and second belts 8, 14 must rotate at identical speeds, so that there is no friction during compaction, which could adversely affect the compaction process.
  • the consolidation unit 22 includes a in the production direction P between the two lower rollers 21 and within the nozzle bar 24 arranged on the second circulating belt 14, which forms a consolidation device 34, and a collecting device 25, which is arranged at a corresponding point in the direction of production and is arranged inside the first circulating belt 8, and which can be a suction box subjected to negative pressure.
  • the nozzle bar 24 On its side facing the lower strand 20, the nozzle bar 24 comprises a plurality of nozzles, from which jets of water occur under pressure during operation of the system 1 and the two layers 5 and 13 through the lower strand 20 of the second circulating belt 14 by swirling fibers solidify.
  • the collecting device 25 is used to collect at least part of the water discharged from the nozzle bar 24, which can then be fed back into the production process—possibly after treatment.
  • a plurality of nozzle beams 26 and collecting devices 27 are provided outside of the second circulating belt, in order to additionally solidify the layers 5 and 13 from above.
  • a further solidification device 28 is provided downstream in the production direction P. It comprises two consolidation drums 29, which are rotated by the layers 5 and 13 during operation in such a way that each of the two layers is in contact with one of the two consolidation drums over an angular range of approximately 120°. Two additional nozzle beams 30 are provided for each consolidation drum 29 and act in an area in which the layers 5 , 13 are in contact with the suction cylinders 29 .
  • the solidification drums each have a gas- and liquid-permeable outer surface, so that at least part of the water discharged from the nozzle bar 30 during operation can be sucked off by the solidification drums and also—possibly after treatment—can be returned to the production process.
  • the consolidation device 28 is used for the further consolidation of the two layers 5 and 13 to form the fleece web 23 which, after passing through the consolidation device, can be fed to further processing steps not described here.
  • system 200 a second embodiment of the system according to the invention. Only the differences to system 100 are described below. In order to avoid repetition, reference is otherwise made to the comments on Annex 100, which also apply to Annex 200.
  • the system 200 comprises lower rollers 31, which are at a greater distance from one another in the production direction P and also from the upper strand 7 of the first circulating belt 8 than the lower rollers 21.
  • the lower rollers 31 are not part of the pre-consolidation unit 22. In plant 200, this is formed by two pressure beams 32 arranged parallel to one another and perpendicular to the production direction P, which are arranged in line with the lower rollers 21 in plant 100 and their function in the pre-consolidation unit 22 substitute.
  • the pressure bars 32 can be provided with plastic caps or with ceramic coatings in the areas in which they come into contact with the circulating belt 14 in order to reduce the friction with the circulating belt 14 .
  • the two pressure beams 32 are replaced by pressure rollers 33.
  • This design is recommended in particular if the pre-consolidation unit 22 is intended to apply higher pressure forces for compaction, since this can lead to an undesirable increase in the friction between the pressure bars 32 and the second circulating belt 14 in the system 200 .
  • a carding unit 1 with which a layer of long fibers can be produced. It comprises a circulating deposit belt 2 with an upper strand 3 on which the long fibers can be deposited in the form of a layer 5 comprising the long fibers 4 .
  • the system 400 also includes a suction roller 6, with which the layer 5 can be transferred to an upper strand 7 of a first belt 8 circulating around rollers 9 in a clockwise direction.
  • the upper run 7 moves towards the in 1 drawn arrow, which thus symbolizes the production direction P.
  • the first circulating belt 8 is designed to be permeable to liquids and gases, for example as a screen belt.
  • the system 400 further comprises a device 11 for providing a layer 13 comprising short fibers 12.
  • the device 11 comprises a second circulating belt 14, which circulates counterclockwise around rollers 15.
  • the second circulating belt 14 is in turn designed to be permeable to liquids and gases, for example as a screen belt. Due to the arrangement of the rollers 15, it forms a region 16 that rises as seen in the direction of rotation, in which the short fibers 12 are deposited from a headbox 17—for example as an aqueous emulsion—to form the layer 13.
  • a headbox 17 for example as an aqueous emulsion
  • the layer 13 comprising short fibers 12 arrives at a lower strand 20 of the second circulating belt 14 via areas 18, 19, which fall obliquely in relation to the direction of rotation.
  • the lower strand 20 is between a first lower pressure roller 35 in the production direction and a second one in the production direction lower pressure roller 36 formed.
  • the first lower pressure roller 35 forms a first compacting device 10 and is part of a pre-consolidation unit 22.
  • the first lower pressure roller 35 is in a position relative to the upper run 7 of the first circulating belt 8 in which the Distance between the lower run 20 of the second circulating belt 14 and the upper run 7 of the first circulating belt 8 is smaller than the sum of the thicknesses of the layers 5 and 13.
  • a second compacting device 10' which is also part of the pre-consolidation unit 22, forms a suction chamber 37. It extends parallel to the first lower pressure roller 35 approximately over at least the width of the first circulating belt 8.
  • the suction chamber 37 has upper, flat contact surfaces 38, on which the upper run 7 of the first circulating belt 8 rests with its underside. Between the contact surfaces 38, the suction chamber 37 has a or more suction openings 39 on.
  • the suction chamber 37 is arranged such that the first circulating belt 8 is pushed upwards by the suction chamber so that the upper run 7 runs parallel to the lower run 20 of the second circulating belt 14 between the first lower pressure roller 35 and the suction chamber 37 .
  • the pre-consolidation unit 22 thus extends in the system 400 between the first lower pressure roller 35 and the suction chamber 37.
  • the first circulating belt 8 drops by an angle ⁇ in relation to the lower run 20 of the second circulating belt 14 .
  • the distance between the belts 8 and 14 increases behind the suction chamber before the second circulating belt 14 is deflected upwards around the second lower roller 36 .
  • This first embodiment of the pre-consolidation unit 22 is in 6 shown separately.
  • the layer 13 is transferred to the layer 5 due to the arrangement of the rollers 15 and the first lower pressure roller 35 at a transfer point Ü, which is located in front of the lower pressure roller 35 as seen in the production direction P. Since the distance between the upper strand 7 and the lower strand 20 between the compacting devices 10 is smaller than the sum of the thicknesses of the two layers 5 and 13, the two layers experience a when passing the area between the first lower pressure roller 35 and the suction chamber 37 first flat compaction on the way to forming a flow path 23. The size of the area depends on the distance between the first lower pressure roller 35 and the suction chamber 37 in the production direction P.
  • the first and second belts 8, 14 must rotate at identical speeds, so that there is no friction during compaction, which could adversely affect the compaction process.
  • the risk of sticking is further reduced in that the second compacting device 10' is designed as a suction chamber 37, to which a negative pressure is applied during operation of the system 400, whereby an air flow is generated through the first circulating belt 8, which is a Detachment of the layer 13 supported by the second circulating band 14.
  • the pre-consolidation unit 22 includes a pressure roller in the production direction P between the first lower pressure roller 35 and the second lower pressure roller 36 and inside the second circulating belt 14 arranged nozzle bar 24, which forms a consolidation device 34, and a collecting device 25 arranged in the direction of production at a corresponding point, arranged inside the first circulating belt 8, which is a suction box subjected to negative pressure can.
  • the nozzle bar 24 On its side facing the lower strand 20, the nozzle bar 24 comprises a plurality of nozzles, from which jets of water occur under pressure during operation of the system 1 and the two layers 5 and 13 through the lower strand 20 of the second circulating belt 14 by swirling fibers solidify.
  • the collecting device 25 is used to collect at least part of the water discharged from the nozzle bar 24, which can then be fed back into the production process—possibly after treatment.
  • a plurality of nozzle beams 26 and collecting devices 27 are provided outside of the second circulating belt, in order to additionally solidify the layers 5 and 13 from above.
  • a further solidification device 28 is provided downstream in the production direction P. It comprises two consolidation drums 29, which are rotated by the layers 5 and 13 during operation in such a way that each of the two layers is in contact with one of the two consolidation drums over an angular range of approximately 120°. Two additional nozzle beams 30 are provided for each consolidation drum 29 and act in an area in which the layers 5 , 13 are in contact with the suction cylinders 29 .
  • the solidification drums each have a gas- and liquid-permeable outer surface, so that at least part of the water discharged from the nozzle bar 30 during operation can be sucked off by the solidification drums and also—possibly after treatment—can be returned to the production process.
  • the consolidation device 28 is used for the further consolidation of the two layers 5 and 13 to form the fleece web 23 which, after passing through the consolidation device, can be fed to further processing steps not described here.
  • a second embodiment of a pre-consolidation unit 22 of the fourth embodiment of the plant 400 is in 7 shown. In order to avoid repetition, only the differences from the first embodiment of the pre-consolidation unit will be described.
  • the same reference symbols designate the same components.
  • a pressure roller 40 is provided instead of the suction chamber 37, which is aligned parallel to the first lower roller, extends over the entire width of the first circulating belt 8 and presses against its upper run 7 from below, analogous to the suction chamber 37 in the first embodiment of the pre-consolidation unit 22.
  • the roller 20 can be designed as a suction roller, which can be subjected to a negative pressure in order to generate an air flow through the first belt 8 directed toward the surface of the suction roller.
  • a third embodiment of a pre-consolidation unit 22 of the fourth embodiment of the plant 400 is in 8 shown. In order to avoid repetition, only the differences from the second embodiment of the pre-consolidation unit will be described.
  • the same reference symbols designate the same components.
  • a pressure roller 40 is again provided, which is aligned parallel to the first lower pressure roller 35, extends over the entire width of the first circulating belt 8 and presses against its upper strand 7 from below.
  • a suction chamber 41 is provided immediately behind this pressure roller 40 in the production direction, which does not bear against the upper run 7 of the first circulating belt 8 from below, but generates an air flow directed from top to bottom through the belt 8 by applying negative pressure and thus the detachment of the Layer 13 supported by the upper encircling band 14.
  • the suction chamber 41 has a suction opening 42 which is adjacent to the pressure roller 40 as viewed in the direction of production.
  • detachment of the layer 13 from the second circulating belt 14 in the direction of production behind the pressure roller 40 is not caused solely by the change in direction that the first circulating belt 8 experiences when passing the pressure roller 40, but is supported by the suction chamber 41 . Since the first circulating belt 8 is not supported by the suction chamber 41 but by the pressure roller 40 rotating with it, and the first circulating belt only rests against the suction chamber in such a way that the air flow caused by the suction chamber takes place through the first circulating belt 8 reduces the friction acting on the first circulating belt compared to the first embodiment of the preconsolidation unit.
  • FIG 9 the first embodiment of a pre-consolidation unit 22 of the fourth embodiment of the system 400 is shown with a modified guidance of the upper strand 7 of the first circulating belt.
  • the same reference symbols designate the same components.
  • the belt 8 does not change direction when passing the first lower pressure roller 35.
  • the belt 8 is guided at the 9
  • the guide shown is such that the upper run 7 of the first circulating belt 8 is pressed against the second circulating belt 14 in the area of the first lower pressure roller 35 and thus undergoes a change in direction by a small angle ⁇ as a result of the action of the pressure roller 35.
  • the three above-described embodiments of the system according to the invention show a carding unit 1 for providing the layer 5 comprising long fibers 4. It goes without saying that not only a carding unit can be used to provide such a layer, but also other devices with which a layer 5 comprising long fibers 4 is inline is producible.
  • the layer can also be generated separately, ie offline, and provided, for example, wound up into a roll. In such a case, for example, an unwinding station is provided instead of the carding unit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Laminated Bodies (AREA)

Claims (15)

  1. Installation (100, 200, 300, 400) de consolidation d'une couche (13) comprenant des fibres courtes (12) avec une couche (5) comprenant des fibres longues (4) en une bande de non-tissé (23),
    avec une première bande périphérique (8), sur laquelle la couche (5) comprenant les fibres longues (4) peut être placée et peut être déplacée dans une direction de production (P) et
    avec une seconde bande périphérique (14), au moyen de laquelle la couche (13) comprenant les fibres courtes (12) peut être transmise au niveau d'un point de transition (Ü) sur la couche (5) comprenant les fibres longues (4),
    caractérisée en ce
    que l'installation (100, 200, 300, 400) comprend une unité de pré-consolidation (22) agencée dans la direction de production (P) directement derrière le point de transition (Ü), qui présente deux dispositifs de compactage (10, 10') espacés l'un de l'autre dans la direction de production (P), qui agissent dans une zone sur la première bande périphérique (8) ou la seconde bande périphérique (14),
    et avec un dispositif de consolidation (34) agencé dans la direction de production (P) entre les deux dispositifs de compactage (10, 10'), au moyen duquel les deux couches (5, 13) peuvent être consolidées l'une avec l'autre par tourbillonnement des fibres longues et courtes (5, 12),
    dans laquelle les dispositifs de compactage (10, 10') et le dispositif de consolidation (34) sont intégrés dans l'installation (100, 200, 300, 400) de manière à se trouver toujours ensemble dans l'état de fonctionnement lorsque la couche (13) comprenant les fibres courtes (12) est transmise à l'aide de la seconde bande périphérique (14).
  2. Installation selon la revendication 1, caractérisée en ce que les dispositifs de compactage (10, 10') comprennent respectivement un cylindre de pression (33).
  3. Installation selon la revendication 1, caractérisée en ce que les dispositifs de compactage (10, 10') comprennent respectivement une barre de pression (32).
  4. Installation selon l'une quelconque des revendications 1 à 3, caractérisée en ce que les dispositifs de compactage (10, 10') sont agencés de manière à reposer dans l'état de fonctionnement sur la première ou de préférence sur la seconde bande (8), (14).
  5. Installation selon l'une quelconque des revendications 1 à 4, caractérisée en ce qu'un rouleau inférieur (31) entouré par la seconde bande (14) est agencé devant l'unité de pré-consolidation (22) vu dans la direction de production (P) et/ou un rouleau inférieur (31) entouré par la seconde bande (14) est agencé derrière l'unité de pré-consolidation (22) vu dans la direction de production (P).
  6. Installation selon la revendication 5, caractérisée en ce que les rouleaux inférieurs (31) sont agencés de manière à ce que la seconde bande (14) présente par rapport à la première bande (8) entre les rouleaux inférieurs (31) et le dispositif de compactage (10) respectivement adjacent, un angle d'entrée (α) entre 1° et 10° et un angle de sortie (α') supérieur à 1°.
  7. Installation selon la revendication 1, caractérisée en ce que le premier dispositif de compactage (10) vu dans la direction de production (P) agit depuis le dessus contre le tronçon inférieur (20) de la seconde bande périphérique (14) et le second dispositif de compactage (10') vu dans la direction de production (P) agit depuis le dessous contre le tronçon supérieur (7) de la première bande périphérique (8), de sorte que la première bande périphérique (8), en passant devant le second dispositif de compactage (10'), subisse une modification de direction selon un angle (β).
  8. Installation selon la revendication 7, caractérisée en ce que le premier dispositif de compactage (10) comprend un premier cylindre de pression (35).
  9. Installation selon la revendication 7 ou 8, caractérisée en ce que le second dispositif de compactage (10') comprend une chambre d'aspiration (37).
  10. Installation selon la revendication 9, caractérisée en ce que la chambre d'aspiration (37) comprend au moins une surface de contact (38) pour la première bande périphérique (8) et de préférence une ouverture d'aspiration (39).
  11. Installation selon la revendication 7 ou 8, caractérisée en ce que le second dispositif de compactage (10') comprend un rouleau de pression (40).
  12. Installation selon la revendication 11, caractérisée en ce qu'une chambre d'aspiration (41) est prévue de préférence directement derrière le rouleau de pression (40) dans la direction de production (P).
  13. Installation selon l'une quelconque des revendications 1 à 12, caractérisée en ce que le dispositif de consolidation (34) comprend une rampe de buses (24).
  14. Installation selon la revendication 13, caractérisée en ce que la rampe de buses est agencée à l'intérieur de la seconde bande (14).
  15. Procédé de fabrication d'une bande de non-tissé (23), qui présente une couche (13) comprenant des fibres courtes (12) et une couche (5) comprenant des fibres longues (4), dans lequel la couche (13) comprenant les fibres courtes (12) est appliquée sur la couche (5) comprenant les fibres longues (4) et ensuite les deux couches sont compactées au moyen d'une pression mécanique agissant sur une zone longitudinale des deux couches et sont consolidées l'une avec l'autre au moyen de jets d'eau agissant dans une partie de cette zone longitudinale, dans lequel de préférence les jets d'eau sont dirigés sur la couche (13) comprenant les fibres courtes (12).
EP22163582.4A 2021-03-29 2022-03-22 Installation et procédé de consolidation des couches comprenant des fibres en une bande de non-tissé Active EP4067549B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021107901.2A DE102021107901A1 (de) 2021-03-29 2021-03-29 Anlage und Verfahren zum Verfestigen von Fasern umfassenden Lagen zu einer Vliesbahn

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EP4067549A1 EP4067549A1 (fr) 2022-10-05
EP4067549B1 true EP4067549B1 (fr) 2023-01-25

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US (1) US11879193B2 (fr)
EP (1) EP4067549B1 (fr)
CN (1) CN115142198A (fr)
DE (1) DE102021107901A1 (fr)
FI (1) FI4067549T3 (fr)
IL (1) IL291740B2 (fr)

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EP1929080B1 (fr) 2005-09-26 2009-04-29 Kimberly-Clark Worldwide, Inc. Procede de fabrication pour combiner une couche de fibres de pate a papier avec un autre substrat
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EP1126064A2 (fr) 2000-02-15 2001-08-22 Gerold Fleissner Dispostif de liage hydrodynamique d'une nappe fibreuse par projection d'un fluide
WO2004063451A1 (fr) 2003-01-14 2004-07-29 Ahlstrom Brignoud Procede de fabrication d'un non tisse composite et installation destinee a effectuer ledit procede
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EP3118361A1 (fr) 2015-07-14 2017-01-18 Trützschler GmbH & Co. KG Installation et procede de fabrication d'un voile multicouche a partir d'au moins un voile de carde non encolle

Also Published As

Publication number Publication date
IL291740B1 (en) 2023-08-01
DE102021107901A1 (de) 2022-09-29
IL291740B2 (en) 2023-12-01
EP4067549A1 (fr) 2022-10-05
US11879193B2 (en) 2024-01-23
CN115142198A (zh) 2022-10-04
IL291740A (en) 2022-10-01
FI4067549T3 (fi) 2023-04-28
US20220307177A1 (en) 2022-09-29

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