EP1210474A1 - Method and device for producing a composite nonwoven for receiving and storing liquids - Google Patents

Method and device for producing a composite nonwoven for receiving and storing liquids

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Publication number
EP1210474A1
EP1210474A1 EP00949462A EP00949462A EP1210474A1 EP 1210474 A1 EP1210474 A1 EP 1210474A1 EP 00949462 A EP00949462 A EP 00949462A EP 00949462 A EP00949462 A EP 00949462A EP 1210474 A1 EP1210474 A1 EP 1210474A1
Authority
EP
European Patent Office
Prior art keywords
layer
nonwoven
fibers
fleece
wood pulp
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00949462A
Other languages
German (de)
French (fr)
Other versions
EP1210474B1 (en
Inventor
Gianni G. Boscolo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Truetzschler Nonwovens GmbH
Albis SpA
Original Assignee
Fleissner GmbH
Albis SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fleissner GmbH, Albis SpA filed Critical Fleissner GmbH
Publication of EP1210474A1 publication Critical patent/EP1210474A1/en
Application granted granted Critical
Publication of EP1210474B1 publication Critical patent/EP1210474B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • 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
    • 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
    • D04H1/492—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 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
    • D04H1/04—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres having existing or potential cohesive properties, e.g. natural fibres, prestretched or fibrillated artificial fibres
    • D04H1/26—Wood pulp
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—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
    • D04H1/42—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 characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4374—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 characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece using different kinds of webs, e.g. by layering webs
    • 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
    • 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
    • D04H1/54—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 by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/56—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 by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres
    • 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
    • D04H1/72—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
    • D04H1/736—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 characterised by the apparatus for arranging fibres
    • 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
    • D04H13/00—Other non-woven fabrics
    • 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

Definitions

  • the invention relates to a method for producing a composite fleece for the absorption and storage of liquids or the like.
  • Consisting of a carrier fleece which is used for consolidation z. B. is hydrodynamically needled, and an applied to the solidified nonwoven cellulose layer such as wood pulp fibers, which is brought into firm contact with the nonwoven.
  • a method of this kind can be found in EP-B-0 540 041.
  • the carrier fleece is essentially not needled with water for consolidation, but rather to increase the liquid permeability of the carrier fleece.
  • the superabsorbent pulp is then applied to the needled nonwoven in one layer, both are brought into good bonding contact, and the composite nonwoven is then dried.
  • the invention has for its object to develop a method and a device necessary to carry out this method, with which such a loss of wood pulp can be avoided during the operation of the effective connection to the carrier fleece.
  • a thin intermediate layer made of a microfiber e.g. B. after the meltblown process, is applied and the layer of cellulose fibers is only applied to this intermediate layer and everything is connected to one another.
  • This connection then expediently again takes place with the hydrodynamic needling.
  • the intermediate layer newly present in such a product also advantageously serves as a barrier for the liquid to be absorbed by the product. Nevertheless, this barrier layer is not an airtight separating layer, which would prevent the breathability of the product.
  • EP 0 418 493 discloses the production of a composite nonwoven fabric solely from unconsolidated textile staple fibers or unconsolidated endless polymer fibers together with a layer of meltblown microfibers, and the hydrodynamic needling of these two layers to connect and consolidate the composite nonwoven. There, however, this combination is used to produce a soft, dry fleece with a higher strength. In addition, the fleece should be treated with water needling in such a way that it has an area of higher and lower strength.
  • the microfiber layer is intended to produce a separating layer for the wood pulp layer to be applied thereon, so that the wood pulp fibers are not sponged into the fibers of the carrier layer during consolidation by means of water needling and are therefore lost for the product to be produced, with consequent costs.
  • a fleece made of polyester and / or polypropylene fibers can be used as the carrier fleece.
  • This fleece is to be needled with water first, that is, to be consolidated. Then a thin layer of microfine fiber, which is less than 1 - 5 ⁇ m thick, is sprayed onto the nonwoven so stable and evenly distributed on the nonwoven.
  • the cooling finest Fibers in a layer with a weight of between 1 - 4 gr / m 2 , preferably 2 gr / m 2 combine to form a kind of film and nevertheless do not represent such an absolutely dense layer.
  • connection of this superabsorbent pulp layer with the carrier fleece covered by the intermediate layer of microfiber is then produced by means of water needling, the fine cellulose fibers now being no longer or only slightly able to be sponged by the carrier unit, that is to say the use effect of the product is retained.
  • a device for carrying out the method of the type according to the invention is shown in principle by way of example in the drawing.
  • the carrier fleece is to be produced from the polyester fibers and / or the polypropylene fibers.
  • the carrier fleece serves as a fleece laying device.
  • B. a card 1-4 or a spunbond system, which is not shown here.
  • the carding machine consists of a box feeder 1 with a shaker chute 2 arranged underneath, which transfers the fibers of the carding machines, which are uniformly spread out over the width, with the known scratching and tearing rollers 3.
  • the following endless belt 4 transfers the laid nonwoven to the endless belt 5, which initially runs through a water needling device 6, which is only shown in principle, for consolidation. A needling on drums is also conceivable here, as described in DE-A-197 06 610.
  • a further layer of a nonwoven as a cover layer on the composite nonwoven after the device 8 before the last needling process 11 give up in order to better integrate the pulp fibers in the end product and thus influence the linting.
  • a further card 1 ', 3' then serves for this purpose, by means of which another fleece is placed on top of the product.
  • a spunbonding line is also possible. Only then will the final one

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Nonwoven Fabrics (AREA)
  • Laminated Bodies (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Multicomponent Fibers (AREA)

Abstract

Known methods involve applying a layer of particularly highly absorbent fibers such as woodpulp on a carrier nonwoven and then compacting said composite nonwoven with the aid of water entanglement. One disadvantage of said compacting method is the high woodpulp fiber loss and the associated purification of the circulating water for the entanglement device. According to the invention, a fine layer of microfibers is initially applied before applying the woodpulp fibers. Said microfibers are evenly distributed on the carrier nonwoven using, for instance, a meltblown process and the woodpulp fibers are only then applied in the separating layer. The water during entanglement can no longer merge the woodpulp fibers into the carrier nonwoven due to the fact that the microfibers act as a barrier.

Description

Verfahren und Vorrichtung zur Herstellung eines Kompositvlieses zur Aufnahme und Speicherung von FlüssigkeitenMethod and device for producing a composite fleece for the absorption and storage of liquids
Die Erfindung bezieht sich auf ein Verfahren zur Herstellung eines Kompositvlieses zur Aufnahme und Speicherung von Flüssigkeiten od. dgl. bestehend aus einem Trägervlies, das zur Verfestigung z. B. hydrodynamisch vernadelt wird, und einer auf das verfestigte Trägervlies aufgegebenen Zellstoffschicht wie aus Woodpulp-Fasern, die mit dem Trägervlies in festen Kontakt gebracht wird. Ein Verfahren dieser Art geht aus der EP-B-0 540 041 hervor. Dort wird das Trägervlies im wesentlichen nicht zur Verfestigung wasservernadelt, sondern um die Flüssigkeitsdurchlässigkeit des Trägervlieses zu erhöhen. Auf das so vernadelte Trägervlies wird dann der superabsorbierende Pulp in einer Schicht aufgegeben, beides in einen guten Bindungskontakt gebracht und dann das Kompositvlies getrocknet.The invention relates to a method for producing a composite fleece for the absorption and storage of liquids or the like. Consisting of a carrier fleece which is used for consolidation z. B. is hydrodynamically needled, and an applied to the solidified nonwoven cellulose layer such as wood pulp fibers, which is brought into firm contact with the nonwoven. A method of this kind can be found in EP-B-0 540 041. There, the carrier fleece is essentially not needled with water for consolidation, but rather to increase the liquid permeability of the carrier fleece. The superabsorbent pulp is then applied to the needled nonwoven in one layer, both are brought into good bonding contact, and the composite nonwoven is then dried.
Es hat sich ergeben, dass eine reine Pressverfestigung nur einen ungenügenden festen Kontakt des Pulps mit dem Trägervlies bringt. Eine zufriedenstellende Verbindung der Woodpulp-Fasern mit dem Trägervlies ist z. B. aus der US-A-3 560 326 oder der WO 92/08834 bekannt, und zwar durch eine hydrodynamische Vemadelung der Woodpulp-Fasern mit dem verfestigten Trägervlies. Diese Art der Verbindung hat jedoch einen hohen Verlust an Zellstofffasern zur Folge. Versuche haben ergeben, dass bis zu 12 % der Woodpulp-Fasern aus der Nutzschicht oder dem Verband ausgewaschen werden und damit für den Nutzeffekt des Produktes verloren gehen. Außerdem gelangen damit auch sehr viele Zellstofffasern in die bei der Wasservemadelung notwendige Filtration des zirkulierenden Wassers. Durch den zusätzlichen erhöhten Aufwand zur Reinigung des wiederverwendeten Wassers verteuert sich das Produkt weiterhin. Eine Wasservemadelung mit nur einem niedrigen Wasserdruck bringt nicht die erforderliche Festigkeit; oder ein stärkeres Trägervlies verursacht zu hohe Kosten.It has been found that a pure press hardening brings only insufficient firm contact of the pulp with the carrier fleece. A satisfactory connection of the wood pulp fibers with the carrier fleece is such. B. from US-A-3 560 326 or WO 92/08834, by hydrodynamic needling of the wood pulp fibers with the solidified carrier fleece. However, this type of connection results in a high loss of cellulose fibers. Tests have shown that up to 12% of the wood pulp fibers are washed out of the wear layer or the dressing and are therefore lost for the usefulness of the product. In addition, a great number of cellulose fibers get into the filtration of the circulating water necessary for water needling. The additional cost of cleaning the reused water makes the product more expensive. A water needling with only a low one Water pressure does not bring the required strength; or a stronger carrier fleece causes too high costs.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine zur Durchführung dieses Verfahrens notwendige Vorrichtung zu entwickeln, mit dem ein derartiger Woodpulp-Verlust beim Arbeitsgang der wirksamen Verbindung mit dem Trägervlies vermieden werden kann.The invention has for its object to develop a method and a device necessary to carry out this method, with which such a loss of wood pulp can be avoided during the operation of the effective connection to the carrier fleece.
Zur Lösung des definierten Problems ist nach der Erfindung vorgesehen, dass auf das verfestigte Trägervlies eine dünne Zwischenschicht aus einer Mikrofaser, z. B. nach dem Meltblown-Verfahren, aufgebracht wird und die Schicht aus den Zellstofffasern erst auf diese Zwischenschicht aufgegeben und alles miteinander verbunden wird. Zweckmäßigerweise erfolgt dann diese Verbindung wieder mit der hydrodynamischen Vemadelung. Die neu in einem solchen Produkt vorhandene Zwischenschicht dient weiterhin mit Vorteil als Barriere für die von dem Produkt aufzunehmende Flüssigkeit. Dennoch ist diese Sperrschicht keine luftdichte Trennschicht, welche die Atmungsaktivität des Produktes verhindern würde.To solve the defined problem it is provided according to the invention that a thin intermediate layer made of a microfiber, e.g. B. after the meltblown process, is applied and the layer of cellulose fibers is only applied to this intermediate layer and everything is connected to one another. This connection then expediently again takes place with the hydrodynamic needling. The intermediate layer newly present in such a product also advantageously serves as a barrier for the liquid to be absorbed by the product. Nevertheless, this barrier layer is not an airtight separating layer, which would prevent the breathability of the product.
Die Herstellung eines Kompositvlieses allein aus unverfestigten textilen Stapelfasern oder unverfestigten endlosen Polymerfasern zusammen mit einer Schicht aus schmelzgeblasenen Microfasern und das hydrodynamische Vernadeln dieser beiden Schichten zur Verbindung und Verfestigung des Kompositvlieses ist durch die EP 0 418 493 bekannt. Dort dient diese Kombination aber zur Herstellung eines weichen, trockenen Vlieses mit einer höheren Festigkeit. Außerdem soll das Vlies mit der Wasservemadelung so behandelt werden, dass es einen Bereich höherer und einen solchen niedriger Festigkeit hat. Bei der Idee nach der Erfindung dagegen soll die Mikrofaserschicht eine Trennschicht für die darauf aufzugebene Woodpulpschicht herstellen, damit beim Verfestigen mittels der Wasservemadelung die Woodpulpfasern nicht in die Fasern der Trägerschicht verschwämmt werden und damit für das herzustellende Produkt mit Kostenfolge verloren gehen.EP 0 418 493 discloses the production of a composite nonwoven fabric solely from unconsolidated textile staple fibers or unconsolidated endless polymer fibers together with a layer of meltblown microfibers, and the hydrodynamic needling of these two layers to connect and consolidate the composite nonwoven. There, however, this combination is used to produce a soft, dry fleece with a higher strength. In addition, the fleece should be treated with water needling in such a way that it has an area of higher and lower strength. In the idea according to the invention, on the other hand, the microfiber layer is intended to produce a separating layer for the wood pulp layer to be applied thereon, so that the wood pulp fibers are not sponged into the fibers of the carrier layer during consolidation by means of water needling and are therefore lost for the product to be produced, with consequent costs.
Als Trägervlies kommt ein Vlies aus Polyester- und/oder Polypropylenfasern in Frage. Dieses Vlies ist zunächst wasserzuvernadeln, also zu verfestigen. Anschließend wird auf das so stabile Trägervlies eine dünne Schicht einer mikrofeinen Faser, die unter 1 - 5 μm dick ist, auf das Vlies gleichmäßig verteilt gesprüht. Die abkühlenden feinsten Fasern in einer Schicht mit einem Gewicht von zwischen 1 - 4 gr/m2, vorzugsweise 2 gr/m2 verbinden sich zu einer Art Folie und stellen dennoch keine solche absolut dichte Schicht dar. Auf diese Sperrschicht werden dann die Zellstofffasern z. B. mit dem bekannten airlay-Verfahren aufgegeben. Die Verbindung dieser superabsorbierenden Pulpschicht mit dem von der Zwischenschicht aus der Mikrofaser bedeckten Trägervlies wird dann mittels der Wasservemadelung erzeugt, wobei jetzt die feinen ZelJ- stofffasern nicht mehr oder nur geringfügig durch die Trägereinheit verschwämmt werden können, also dem Gebrauchseffekt des Produktes erhalten bleiben.A fleece made of polyester and / or polypropylene fibers can be used as the carrier fleece. This fleece is to be needled with water first, that is, to be consolidated. Then a thin layer of microfine fiber, which is less than 1 - 5 μm thick, is sprayed onto the nonwoven so stable and evenly distributed on the nonwoven. The cooling finest Fibers in a layer with a weight of between 1 - 4 gr / m 2 , preferably 2 gr / m 2 combine to form a kind of film and nevertheless do not represent such an absolutely dense layer. B. abandoned with the known airlay method. The connection of this superabsorbent pulp layer with the carrier fleece covered by the intermediate layer of microfiber is then produced by means of water needling, the fine cellulose fibers now being no longer or only slightly able to be sponged by the carrier unit, that is to say the use effect of the product is retained.
Eine Vorrichtung zur Durchführung des Verfahrens der erfindungsgemäßen Art ist prinzipmäßig in der Zeichnung beispielhaft dargestellt.A device for carrying out the method of the type according to the invention is shown in principle by way of example in the drawing.
Zunächst ist das Trägervlies aus den Polyesterfasern und/oder den Polypropylenfasern herzustellen. Dazu dient als Vlieslegeeinrichtung z. B. eine Krempel 1 - 4 oder eine Spinnvliesanlage, die hier nicht dargestellt ist. Die Krempel besteht aus einem Kastenspeiser 1 mit einer darunter angeordneten Schüttelrutsche 2, die die gleichmäßig über die Breite ausgebreiteten Fasern der Krempel mit den bekannten Kratz- und Reißwalzen 3 übergibt. Das folgende Endlosband 4 übergibt das gelegte Trägervlies an das Endlosband 5, das zunächst durch eine nur prinzipiell dargestellte Wasservernadelungseinrichtung 6 zur Verfestigung läuft. Hier ist auch eine Vemadelung auf Trommeln denkbar, wie es in der DE-A-197 06 610 beschrieben ist. In fortlaufendem Arbeitsgang wird nun mittels der Einrichtung 7, die nach dem vorbekannten Meltblown-Verfahren arbeitet, eine dünne Schicht von feinsten Fasern gleichmäßig verteilt auf das Trägervlies aufgebracht. Diese Microfasern bilden eine Art Folie, die aber aus einzelnen Fasern besteht, die sehr dicht zueinander verlegt sind. Auf diese Barriereschicht werden nunmehr die Zellstoff- Fasern nach dem air-lay-Verfahren mittels der Vorrichtung 8 gelegt, die im einzelnen in der EP-A-0 032 772 beschrieben ist. Damit ist das Kompositvlies hergestellt und braucht nur noch verfestigt und getrocknet zu werden. Dazu läuft es über die gestrichelt dargestellte Bahn 9 auf das Endlosband 10 zur Vernadelungseinrichtung 1 1 , die ähnlich der Einrichtung 6 aufgebaut sein kann. Im Siebtrommeltrockner 12 kann im kontinuierlichen Durchlaufverfahren der Trockenvorgang durchgeführt werden.First of all, the carrier fleece is to be produced from the polyester fibers and / or the polypropylene fibers. For this purpose serves as a fleece laying device. B. a card 1-4 or a spunbond system, which is not shown here. The carding machine consists of a box feeder 1 with a shaker chute 2 arranged underneath, which transfers the fibers of the carding machines, which are uniformly spread out over the width, with the known scratching and tearing rollers 3. The following endless belt 4 transfers the laid nonwoven to the endless belt 5, which initially runs through a water needling device 6, which is only shown in principle, for consolidation. A needling on drums is also conceivable here, as described in DE-A-197 06 610. In a continuous process, a thin layer of the finest fibers is applied uniformly to the carrier fleece by means of the device 7, which works according to the previously known meltblown process. These microfibers form a kind of film, which consists of individual fibers that are laid very close to each other. The cellulose fibers are now placed on this barrier layer by the air-lay method by means of the device 8, which is described in detail in EP-A-0 032 772. The composite fleece is now produced and only needs to be consolidated and dried. For this purpose, it runs over the web 9 shown in dashed lines onto the endless belt 10 to the needling device 11, which can be constructed similarly to the device 6. In the drum dryer 12, the drying process can be carried out in a continuous process.
Es ist aber möglich, vor dem letzten Vernadelungsvorgang 11 noch eine weitere Schicht eines Vlieses als Deckschicht auf das Kompositvlies nach der Einrichtung 8 aufzugeben, um die Zellstofffasern im Endprodukt besser einzubinden und damit das Linting zu beeinflussen. Dazu dient dann eine weitere Krempel 1 ', 3', mittels der ein weiteres Vlies auf das Produkt oben aufgelegt wird. Hier ist wiederum auch eine Spinnvliesanlage möglich. Erst dann wird der abschließendeHowever, it is possible to have a further layer of a nonwoven as a cover layer on the composite nonwoven after the device 8 before the last needling process 11 give up in order to better integrate the pulp fibers in the end product and thus influence the linting. A further card 1 ', 3' then serves for this purpose, by means of which another fleece is placed on top of the product. Here, in turn, a spunbonding line is also possible. Only then will the final one
Wasservemadelungsvorgang 1 1 mit Trocknung 12 durchgeführt. Water needling process 1 1 carried out with drying 12.

Claims

P a t e n t a n s p r ü c h e : Patent claims:
1. Verfahren zur Herstellung eines Kompositvlieses zur Aufnahme und Speicherung von Flüssigkeiten od. dgl. bestehend aus einem Trägervlies, das zur Verfestigung z. B. hydrodynamisch vernadelt wird, und einer auf das verfestigte Trägervlies aufgegebenen Zellstoffschicht wie aus Woodpulp-Fasern, die mit dem Trägervlies in festen Kontakt gebracht wird, dadurch gekennzeichnet, dass auf das verfestigte Trägervlies eine dünne Zwischenschicht aus einer Mikrofaser, z. B. nach dem Meltblown-Verfahren, aufgebracht wird und die Schicht aus den Zellstofffasern erst auf diese Zwischenschicht aufgegeben und alles miteinander verbunden wird.1. A process for the production of a composite fleece for the absorption and storage of liquids or the like. Consisting of a carrier fleece which is used for consolidation, e.g. B. is hydrodynamically needled, and an abandoned on the solidified nonwoven cellulose layer such as wood pulp fibers, which is brought into firm contact with the nonwoven, characterized in that on the solidified nonwoven a thin intermediate layer of a microfiber, for. B. after the meltblown process, is applied and the layer of cellulose fibers is only applied to this intermediate layer and everything is connected to one another.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Verbindung der Zellstofffaserschicht mit der Zwischenschicht aus der Mikrofaser und zusätzlich mit dem Trägervlies mittels hydrodynamischer Vemadelung erzeugt wird.2. The method according to claim 1, characterized in that the connection of the cellulose fiber layer with the intermediate layer of microfiber and additionally with the carrier fleece is produced by means of hydrodynamic needling.
3. Verfahren nach einem der Ansprüche 1 - 2, dadurch gekennzeichnet, dass auf die Woodpulp-Schicht eine vierte Schicht als Deckschicht aufgebracht und alles zusammen zur Verbindung mittels einer hydrodynamischen Vemadelung beaufschlagt wird.3. The method according to any one of claims 1-2, characterized in that a fourth layer is applied as a cover layer to the wood pulp layer and everything is applied together for connection by means of hydrodynamic needling.
4. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 - 3, dadurch gekennzeichnet, dass die Kontinueanlage besteht aus einer Vlieslegeeinrichtung wie Krempel (1 - 4) oder Spinnvliesanlage, vorzugsweise einer Wasservernadelungseinrichtung (6), einer Meltbiown-Einrichtung (7) zur Aufgabe einer feinen Zwischenschicht aus Microfasern, einer Einrichtung (8) zur Aufgabe einer Schicht aus Zellstofffasern (Woodpulp) und wieder einer Wasservernadelungseinrichtung (1 1 ).4. Device for performing the method according to one of claims 1-3, characterized in that the continuous system consists of a fleece laying device such as carding (1-4) or spunbonding plant, preferably a water needling device (6), a melt biown device (7) Feeding a fine intermediate layer of microfibers, a device (8) for feeding a layer of cellulose fibers (wood pulp) and again a water needling device (1 1).
5. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass sie ergänzt ist durch eine Aufgabeeinrichtung, wie Krempel (1 ', 3') oder Spinnvliesanlage, für eine weitere Deckschicht auf die Woodpulp-Schicht des Kompositvlieses, der sich dann die genannte Wasservernadelungseinrichtung (1 1 ) anschließt. 5. The device according to claim 5, characterized in that it is supplemented by a feeding device, such as card (1 ', 3') or spunbonded system, for a further cover layer on the wood pulp layer of the composite nonwoven, which is then the water needling device (1st 1) connects.
EP00949462A 1999-08-19 2000-08-05 Method and device for producing a composite nonwoven for receiving and storing liquids Expired - Lifetime EP1210474B1 (en)

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DE19938809A DE19938809A1 (en) 1999-08-19 1999-08-19 Manufacture of absorbent non-woven for absorbing and holding liquids, consist of wood pulp fibers carried on support layer by initial deposition of micro-fibers on support layer
DE19938809 1999-08-19
PCT/EP2000/007621 WO2001014624A1 (en) 1999-08-19 2000-08-05 Method and device for producing a composite nonwoven for receiving and storing liquids

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