EP0685009B1 - Composite nonwoven fabric and process for producing the same - Google Patents

Composite nonwoven fabric and process for producing the same Download PDF

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Publication number
EP0685009B1
EP0685009B1 EP94906867A EP94906867A EP0685009B1 EP 0685009 B1 EP0685009 B1 EP 0685009B1 EP 94906867 A EP94906867 A EP 94906867A EP 94906867 A EP94906867 A EP 94906867A EP 0685009 B1 EP0685009 B1 EP 0685009B1
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EP
European Patent Office
Prior art keywords
fibres
woven
adhesive
nap
fibers
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Revoked
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EP94906867A
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German (de)
French (fr)
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EP0685009A1 (en
Inventor
Tarek Fahmy
Axel Nickel
Myrtha Wehrle
Ulrich Preiss
Joachim Bauer
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Corovin GmbH
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Corovin GmbH
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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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
    • D04H3/153—Mixed yarns or filaments
    • 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
    • D04H1/559—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 the fibres being within 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
    • 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
    • D04H5/06—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length strengthened or consolidated by welding-together thermoplastic fibres, filaments, or yarns

Definitions

  • the invention relates to a composite fleece according to the preamble of claim 1.
  • crimped fibers are used which, due to their geometry, keep neighboring fibers at a distance.
  • a compression process is then necessary, in which the crimped fibers are also inevitably compressed, thereby reducing the original volume again.
  • the invention has for its object to provide a composite fleece, one component of which consists of a voluminous pile of crimped fibers or filaments, which is characterized by a high mechanical strength, which is achieved without reducing the pile volume.
  • the volume created during the formation of the pile is retained in the composite nonwoven according to the invention, since the fibers or filaments of the pile are not consolidated. Nevertheless, there is a high mechanical strength due to the carrier fleece, to which only the ends of the fibers or filaments of the pile facing the carrier fleece are glued. With this product, the two subtasks - large volume and great strength - are taken over by two different components, which avoids compromises to the detriment of the volume property or the strength property.
  • prefabricated fibers or filaments can be used for the pile, in which a particularly pronounced crimp was achieved in previous treatment stages and thus created the prerequisite for a particularly large pile volume in comparison to the volume of material used.
  • this optimal treatment to achieve the crimp would not be given if the crimp - as in the prior art - is only carried out as part of the formation of the fleece. The volume gain is inevitably lower here.
  • the composite fleece according to the invention is particularly suitable as a liquid buffer, a liquid valve and as a drainage for diapers.
  • a covering fleece on the absorbent body in an arrangement in which the pile is directed towards the absorbent body and the carrier fleece is directed towards the body the composite fleece is characterized by a high passage and absorption speed for liquid.
  • urine and body fluid are first temporarily stored in the pile and then slowly passed on to the absorbent body and there z. B. bound by superabsorbent. Since the absorbent body has only a low penetration rate, it is not able to absorb it immediately in the event of large quantities of liquid being dispensed in batches, as a result of which the non-absorbed fluid would run off the surface of the absorbent body.
  • the passage and take-up speed of the fleece according to the invention for liquid is significantly higher.
  • the voluminous pile ensures that the short-term absorption capacity for liquid can be designed so that it is just sufficient for the amount of liquid that arises when the bladder is emptied is sufficient. Even if the amount of liquid hitting first only wets a small area, it is then quickly distributed in the longitudinal direction of the fleece in the manner of a drainage through the pile. This effect in turn has a favorable effect on the subsequent transfer of the liquid into the absorbent body, because a large area is now available for the transfer.
  • volumes of approx. 70 ml, which correspond to a bladder emptying, are absorbed by conventional diapers in about 50 seconds.
  • the penetration time is reduced to 25 seconds.
  • the composite fleece according to the invention thereby exhibits a valve-adhering property of allowing liquid to pass through only in one direction and to block it in the other direction.
  • Embodiment variants of the invention further provide that the fibers of the pile and the fibers of the carrier fleece each have the same or a different surface character compared to liquids.
  • a different surface character there is either the possibility that the fibers of the pile have water-wettable (hydrophilic) and the fibers of the carrier fleece have water-repellent (hydrophobic) properties, or vice versa that the fibers of the pile have water-repellent (hydrophobic) and the fibers of the carrier fleece have water-wettable properties Have (hydrophilic) properties.
  • the fibers of the carrier fleece are assigned water-wettable properties and the fibers or filaments of the pile are water-repellent properties.
  • the pile additionally comprises a fiber portion which can be reactivated as an adhesive when heated.
  • these adhesive fibers In addition to the connection of the fiber or filament ends with the carrier fleece, these adhesive fibers also create a connection in regions of the pile that lie further inside. This is useful if the pile is outside in the application and is subject to abrasive effects. The softness and suppleness of the pile and its volume are only slightly impaired by this, since the adhesive fibers also retain their fiber structure and properties during and after their activation as an adhesive.
  • Polyester, polypropylene or polyacrylic can be used as the material for the crimped fibers.
  • the choice of material can vary depending on the desired softness and the water-repellent or water-wettable Straighten properties that these materials inherently have.
  • the pile can additionally comprise a fiber portion made from natural fibers.
  • natural fibers come z. B. as natural fibers cotton, viscose, cellulose. These fibers have natural water-wettable (hydrophilic) properties and swelling properties.
  • this property helps to dry the surface fleece of the diaper or sanitary napkin more quickly.
  • reactivable fibers are preferably used when heating as one-component fibers, which consist of polyetylene acrylate copolymers.
  • This material is characterized by the fact that it has a high level of adhesiveness compared to different other materials and that the tackiness starts at temperatures which are substantially lower than the melting point of the materials to be bonded.
  • bicomponent fibers can also be used as adhesive fibers, either exclusively or as a proportion of the one-component fibers.
  • the pile has a basis weight between 10 and 100 g / m 2 , preferably between 30 and 60 g / m 2 .
  • This range of values is particularly favorable for the area of application as a covering fleece for diapers, since this ensures the required buffer capacity for liquid storage and the drainage effect in the longitudinal direction.
  • the invention further relates to a method of manufacture a composite fleece according to the preamble of claim 10.
  • This object is achieved in a method with the features of the preamble of claim 10 by the features specified in the characterizing part.
  • the pile and the carrier fleece are expediently joined together under the action of slight pressure.
  • the pressure can alternatively be applied by engraved or non-engraved squeeze rollers or by the impact of a warm air stream. In the latter version, the warm air flow can simultaneously supply the energy for reactivating the adhesive fibers.
  • a first variant provides that first a pile of ruffled on a sieve belt Fibers or filaments is deposited, that a carrier fleece produced in a simultaneous or separate process with fibers that can be reactivated when heated as an adhesive is then fed, and that the carrier fleece is placed on the pile of crimped fibers or filaments and with this under the influence of pressure and temperature is glued.
  • a carrier fleece with fibers that can be reactivated when heated as an adhesive is first produced on a screen belt or laying belt of a melt spinning or meltblowing system, and then a pile of crimped fibers or filaments is applied to the carrier fleece, which with the Surface of the carrier fleece is glued under the influence of pressure and temperature.
  • the pile is created just before gluing.
  • the pile is not capable of independent existence and cannot - as would be possible with a fleece - be wound up on rolls and stored temporarily.
  • the fibers or filaments forming a loose layer would fall apart again. It is only possible to transport the unstable pile layer in the loose state with the help of the sieve or laying tape, until finally the adhesive connection with the carrier fleece ensures stability.
  • adhesive fibers can also be added to the pile during pile formation. These adhesive fibers then ensure that there are occasionally also adhesive connections in more inner areas of the pile. The pile also withstands abrasive influences. Since the adhesive fibers are only partially added the characteristic properties of the pile are retained.
  • Fig. 1 shows a section through a composite fleece according to the invention.
  • This consists of a voluminous pile 10 made of crimped fibers or filaments and a carrier fleece 12 which carries or contains fibers 14 which can be reactivated as an adhesive when heated.
  • the fibers 14 are located here on the side facing the pile 10, so that an adhesive connection is formed only when heated.
  • the pile has a basis weight between 10 and 100 g / m 2 , preferably between 30 and 60 g / m 2 .
  • the adhesive fibers 14 are characterized in that they can be reactivated as an adhesive when heated without losing their fiber structure.
  • the crimped fibers or Filaments of the pile 10 are glued to the surface of the carrier fleece 12 by means of the fibers 14 reactivated as an adhesive.
  • the fibers of the pile 10 and the fibers of the carrier fleece 12 can each have the same or a different surface character compared to liquids. With different surface characteristics, there is the possibility that the fibers of the pile 10 have water-wettable (hydrophilic) and the fibers of the carrier fleece 12 have water-repellent (hydrophobic) properties. The reverse case is also possible that the fibers of the pile 10 have water-repellent (hydrophobic) properties and the fibers of the carrier fleece 12 have water-wettable (hydrophilic) properties.
  • the pile 10 can also additionally comprise a fiber portion which can be reactivated as an adhesive when heated.
  • Polyester, polypropylene or polyacrylic can be used as the material for the fibers or filaments of the pile.
  • the carrier fleece 12 is preferably made of polyethylene or polypropylene. Polyethylene acrylate copolymers, polyethylene vinyl acetate, atactic polypropylene, crafted polypropylene, alpha-polyolephine or a combination or sub-combination of these substances are suitable as the material for the fibers 14 which can be reactivated as an adhesive and which are formed by one-component fibers.
  • Figures 2 and 3 show devices for producing a composite nonwoven according to the invention.
  • prefabricated crimped fibers or filaments 18 from a card 16 are deposited on a wire belt 20 to form a pile 10.
  • the sieve belt 20 transports the pile 10 further.
  • a carrier fleece 12 produced in a simultaneous or separate process is fed.
  • the carrier fleece 12 was previously covered on its surface, which later points in the direction of the pile 10, with fibers 14 which can be reactivated as an adhesive when heated.
  • These adhesive fibers 14 can, for. B. be applied by means of a melt blowing system.
  • the carrier fleece 12 is fed from above. However, it is also possible to divide the screen belt 20 into two sections adjoining one another to form a gap and to feed the carrier fleece 12 through the gap from below.
  • squeeze rollers 22 follow, which are warmed up to the temperature for activating the adhesive fibers 14 and exert a slight pressure on the layers of the pile 10 and the carrier fleece 12 lying on top of one another, so that the adhesive connection is achieved evenly.
  • This pressure can be significantly lower than in the case of nonwoven formation processes, because the pile 10 is not intended to be consolidated, but rather only to be adhered to the carrier nonwoven 12.
  • nozzles 24 can alternatively or additionally also be provided, which blow warm air against the surface of the pile 10 and / or the carrier fleece 12, so that the pressure due to the impact of the energy at the same time to reactivate the Airflow supplying adhesive fibers is applied.
  • a carrier fleece 12 is first produced on a wire belt or laying belt 26 of a melt spinning or meltblowing system and fibers 14 which are formed by means of a meltblowing system can be reactivated when heated as an adhesive, applied to the carrier fleece 12.
  • Prefabricated crimped fibers or filaments 18 of a card 16 are then placed on the carrier fleece 12 already provided with the adhesive fibers 14 to form a pile 10.
  • squeeze rollers 22 which are warmed up to the temperature for activating the adhesive fibers 14 and, as already mentioned in connection with the device according to FIG. 1, exert a slight pressure on the layers of the pile 10 and the carrier fleece 12 lying one on top of the other.
  • nozzles 24 can be provided which blow warm air against the surface of the pile 10 and / or the carrier fleece 12.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Manufacturing Of Multi-Layer Textile Fabrics (AREA)
  • Woven Fabrics (AREA)

Abstract

One of the components of the disclosed nonwoven fabric consists of a voluminous pile of curled fibers or filaments and another component consists of a supporting nonwoven fabric bearing or containing fibers which may be reactivated by heating into an adhesive without losing their fibrous structure. The curled pile fibers or filaments are bonded to the surface of the supporting nonwoven fabric the reactivated adhesive fibers of which constitute an adhesive.

Description

Die Erfindung betrifft ein Verbundvlies nach dem Oberbegriff des Anspruchs 1.The invention relates to a composite fleece according to the preamble of claim 1.

Zur Schaffung eines voluminösen Flor werden gekräuselte Fasern eingesetzt, die aufgrund ihrer Geometrie benachbarte Fasern auf Abstand halten. Um diese Fasern in einem Verbund zu bringen, ist es aus der US-PS 4 118 531 bekannt, sie in einen Strom aus dünnen Fasern oder Filamenten einzublasen und gemeinsam abzulegen. Zur Vliesbildung ist dann allerdings noch ein Verdichtungsprozeß erforderlich, bei dem auch die gekräuselten Fasern zwangsläufig mit verdichtet werden und dadurch das ursprüngliche Volumen wieder reduziert wird.To create a voluminous pile, crimped fibers are used which, due to their geometry, keep neighboring fibers at a distance. In order to bring these fibers together, it is known from US Pat. No. 4,118,531 to blow them into a stream of thin fibers or filaments and to lay them down together. For the formation of the fleece, however, a compression process is then necessary, in which the crimped fibers are also inevitably compressed, thereby reducing the original volume again.

Weiterhin ist aus der US-PS 5 108 820 bekannt, zur Erzeugung gekräuselter Fasern Bikomponentenfasern zu verwenden, deren Komponenten bei Erwärmung unterschiedlich schrumpfen und so während des Herstellungsprozesses kräuseln. Diese Fasern werden zusammen mit weiteren Fasern nach der "spun-bonded" Methode zu einem Vlies verarbeitet. Da auch hierbei die gekräuselten Fasern in dem zur Verfestigung nötigen Kalandrierungsprozeß zwangsläufig mit verdichtet werden müssen, tritt ebenfalls eine Reduktion des maximal möglichen Volumens ein.Furthermore, it is known from US Pat. No. 5,108,820 to use bicomponent fibers for producing crimped fibers, the components of which shrink differently when heated and thus crimp during the production process. These fibers are processed together with other fibers according to the "spun-bonded" method to form a fleece. Since here too the crimped fibers inevitably have to be compressed in the calendering process required for solidification, the maximum possible volume is also reduced.

Schließlich ist aus der DE-OS 0 391 260 bekannt, Einkomponentenfasern zu verwenden, die unter Temperatureinwirkung sowohl gekräuselt als auch miteinander verschmolzen werden. Hierbei tritt jedoch nur eine verminderte Kräuselung ein und zudem geht die Faserstruktur durch die Druck- und Temperaturbeaufschlagung zur Erzeugung der Kräuselung verloren, wodurch im Vergleich zum eingesetzten Materialvolumen nur ein geringes Florvolumen erzielt wird.Finally, it is known from DE-OS 0 391 260 to use single-component fibers which are both crimped and fused together under the influence of temperature. Here, however, there is only a reduced crimp and, moreover, the fiber structure is lost due to the pressure and temperature exposure to produce the crimp, as a result of which only a small pile volume is achieved in comparison with the volume of material used.

Der Erfindung liegt die Aufgabe zugrunde, ein Verbundvlies, dessen eine Komponente aus einem voluminösen Flor aus gekräuselten Fasern oder Filamenten besteht, zu schaffen, das sich durch eine große mechanische Festigkeit auszeichnet, die ohne Reduktion des Florvolumens erzielt wird.The invention has for its object to provide a composite fleece, one component of which consists of a voluminous pile of crimped fibers or filaments, which is characterized by a high mechanical strength, which is achieved without reducing the pile volume.

Diese Aufgabe wird bei einem Verbundvlies mit den Merkmalen des Oberbegriffs des Anspruchs 1 durch die im Kennzeichen angegebenen Merkmale gelöst.This object is achieved in a composite fleece with the features of the preamble of claim 1 by the features specified in the characterizing part.

Im Gegensatz zu den Varianten des Standes der Technik bleibt beim erfindungsgemäßen Verbundvlies das bei der Florbildung geschaffene Volumen erhalten, da die Fasern oder Filamente des Flor nicht verfestigt werden. Trotzdem ergibt sich eine hohe mechanische Festigkeit durch das Trägervlies, an das lediglich die dem Trägervlies zugewandten Enden der Fasern oder Filamente des Flor angeklebt sind. Bei diesem Produkt werden also die beiden Teilaufgaben - großes Volumen und große Festigkeit - von zwei unterschiedlichen Komponenten übernommen, wodurch Kompromisse zum Nachteil der Volumeneigenschaft oder der Festigkeitseigenschaft vermieden werden.In contrast to the variants of the prior art, the volume created during the formation of the pile is retained in the composite nonwoven according to the invention, since the fibers or filaments of the pile are not consolidated. Nevertheless, there is a high mechanical strength due to the carrier fleece, to which only the ends of the fibers or filaments of the pile facing the carrier fleece are glued. With this product, the two subtasks - large volume and great strength - are taken over by two different components, which avoids compromises to the detriment of the volume property or the strength property.

Weiterhin lassen sich für den Flor vorgefertigte Fasern oder Filamente einsetzen, bei denen in vorausgehenden Behandlungsstufen eine besonders ausgeprägte Kräuselung erzielt wurde und damit die Voraussetzung für ein besonders großes Florvolumen im Vergleich zum eingesetzten Materialvolumen geschaffen wurde. Diese optimale Behandlung zur Erzielung der Kräuselung wäre aber nicht gegeben, wenn die Kräuselung - wie beim Stand der Technik - erst im Rahmen der Vliesbildung durchgeführt wird. Der Volumengewinn ist hier zwangsläufig geringer.In addition, prefabricated fibers or filaments can be used for the pile, in which a particularly pronounced crimp was achieved in previous treatment stages and thus created the prerequisite for a particularly large pile volume in comparison to the volume of material used. However, this optimal treatment to achieve the crimp would not be given if the crimp - as in the prior art - is only carried out as part of the formation of the fleece. The volume gain is inevitably lower here.

Das erfindungsgemäße Verbundvlies eignet sich besonders als Flüssigkeitspuffer, als Flüssigkeitsventil und als Drainage bei Windeln. Als Abdeckvlies auf dem Saugkörper in einer Anordnung, bei der der Flor zum Saugkörper und das Trägervlies zum Körper gerichtet ist, zeichnet sich das Verbundvlies durch eine hohe Durchtritts- und Aufnahmegeschwindigkeit für Flüssigkeit aus. Dabei wird Urin und Körperflüssigkeit nach Durchtritt des Trägervlieses zuerst im Flor zwischengespeichert und anschließend langsam an den Saugkörper weitergegeben und dort z. B. durch Superabsorber gebunden. Da der Saugkörper nur eine geringe Eindringgeschwindigkeit besitzt, ist er bei schubweise abgegebenen großen Flüssigkeitsmengen nicht in der Lage, diese sofort aufzunehmen, wodurch die nicht absorbierte Flüssigkeit auf der Oberfläche des Saugkörpers ablaufen würde.The composite fleece according to the invention is particularly suitable as a liquid buffer, a liquid valve and as a drainage for diapers. As a covering fleece on the absorbent body in an arrangement in which the pile is directed towards the absorbent body and the carrier fleece is directed towards the body, the composite fleece is characterized by a high passage and absorption speed for liquid. After passing through the carrier fleece, urine and body fluid are first temporarily stored in the pile and then slowly passed on to the absorbent body and there z. B. bound by superabsorbent. Since the absorbent body has only a low penetration rate, it is not able to absorb it immediately in the event of large quantities of liquid being dispensed in batches, as a result of which the non-absorbed fluid would run off the surface of the absorbent body.

Demgegenüber ist die Durchtritts und Aufnahmegeschwindigkeit des erfindungsgemäßen Vlieses für Flüssigkeit wesentlich höher. Durch das voluminöse Flor wird dabei erreicht, daß die kurzzeitige Aufnahmekapazität für Flüssigkeit so ausgelegt werden kann, daß sie für die bei einer Blasenentleerung anfallende Flüssigkeitsmenge gerade ausreicht. Auch wenn die auftreffende Flüssigkeitsmenge zuerst nur eine kleine Fläche benetzt, wird sie anschließend nach Art einer Drainage durch den Flor schnell in Längsrichtung des Vlieses verteilt. Dieser Effekt wiederum wirkt sich günstig auf den anschließenden Übergang der Flüssigkeit in den Saugkörper aus, denn für den Übertritt steht nun eine große Fläche zur Verfügung.In contrast, the passage and take-up speed of the fleece according to the invention for liquid is significantly higher. The voluminous pile ensures that the short-term absorption capacity for liquid can be designed so that it is just sufficient for the amount of liquid that arises when the bladder is emptied is sufficient. Even if the amount of liquid hitting first only wets a small area, it is then quickly distributed in the longitudinal direction of the fleece in the manner of a drainage through the pile. This effect in turn has a favorable effect on the subsequent transfer of the liquid into the absorbent body, because a large area is now available for the transfer.

Volumina von ca. 70 ml, die einer Blasenentleerung entsprechen, werden durch herkömmliche Windeln in etwa 50 sec aufgenommen. Durch Auflage des erfindungsgemäßen Verbundvlieses auf den Saugkörper einer herkömmlichen Windel erniedrigt sich die Eindringzeit auf 25 sec.Volumes of approx. 70 ml, which correspond to a bladder emptying, are absorbed by conventional diapers in about 50 seconds. By placing the composite fleece according to the invention on the absorbent body of a conventional diaper, the penetration time is reduced to 25 seconds.

Wird der Saugkörper gequetscht, so daß noch nicht gebundene Flüssigkeit wieder herausquillt, so wird diese erneut vom Flor als Puffer aufgenommen. Eine Rücknässung zum Körper wird so vermieden oder stark erschwert. Es wurden Rücknässungswerte gemessen, die um 70% niedrieger waren als bei herkömmlichen Windeln. Das erfindungsgemäße Verbundvlies zeigt dadurch eine Ventilen anhaftende Eigenschaft, Flüssigkeit nur in einer Richtung durchzulassen und in der anderen Richtung zu sperren.If the absorbent body is squeezed so that liquid that has not yet bound oozes out again, it is again taken up by the pile as a buffer. Wetting back to the body is avoided or made very difficult. Wetting values were measured, which were 70% lower than with conventional diapers. The composite fleece according to the invention thereby exhibits a valve-adhering property of allowing liquid to pass through only in one direction and to block it in the other direction.

Ausgestaltungvarianten der Erfindung sehen weiterhin vor, daß die Fasern des Flor und die Fasern des Trägervlieses jeweils den gleichen oder einen unterschiedlichen Oberflächencharakter gegenüber Flüssigkeiten aufweisen. Bei einem unterschiedlichen Oberflächencharakter besteht entweder die Möglichkeit, daß die Fasern des Flor wasserbenetzbare (hydrophile) und die Fasern des Trägervlieses wasserabstoßende (hydrophobe) Eigenschaften aufweisen, oder umgekehrt, daß die Fasern des Flor wasserabstoßende (hydrophobe) und die Fasern des Trägervlieses wasserbenetzbare (hydrophile) Eigenschaften aufweisen.Embodiment variants of the invention further provide that the fibers of the pile and the fibers of the carrier fleece each have the same or a different surface character compared to liquids. With a different surface character, there is either the possibility that the fibers of the pile have water-wettable (hydrophilic) and the fibers of the carrier fleece have water-repellent (hydrophobic) properties, or vice versa that the fibers of the pile have water-repellent (hydrophobic) and the fibers of the carrier fleece have water-wettable properties Have (hydrophilic) properties.

Diese Eigenschaften lassen sich dem Flor und dem Trägervlies gezielt zuordnen. Bei Fasern oder Filamenten, die von sich aus wasserabstoßende oder wasserbenetzbare Eigenschaften aufweisen, kann der umgekehrte Effekt durch eine Oberflächenbehandlung der Fasern vor der Bildung des Verbundvlieses eingestellt werden.These properties can be specifically assigned to the pile and the carrier fleece. In the case of fibers or filaments which have inherently water-repellent or water-wettable properties, the reverse effect can be set by surface treatment of the fibers before the composite nonwoven is formed.

Bei dem bereits erwähnten Abdeckvlies für Windeln wird man, wenn das Trägervlies zum Körper und der Flor zum Saugkörper angeordnet wird, den Fasern des Trägervlieses wasserbenetzbare und den Fasern oder Filamenten des Flor wasserabstoßende Eigenschaften zuordnen.In the cover fleece for diapers already mentioned, if the carrier fleece is arranged to the body and the pile to the absorbent body, the fibers of the carrier fleece are assigned water-wettable properties and the fibers or filaments of the pile are water-repellent properties.

Eine Weiterbildung sieht vor, daß der Flor zusätzlich einen Faseranteil umfaßt, der bei Erwärmung als Kleber reaktivierbar ist.A further development provides that the pile additionally comprises a fiber portion which can be reactivated as an adhesive when heated.

Diese Klebefasern schaffen neben der Verbindung der Faser- oder Filamentenden mit dem Trägervlies auch eine Verbindung in weiter innenliegenden Bereichen des Flor. Dies ist dann zweckmäßig, wenn der Flor im Anwendungsfall außen liegt und abrasiven Einwirkungen unterworfen ist. Die Weichheit und Geschmeidigkeit des Flor sowie sein Volumen werden hierdurch nur geringfügig beeinträchtigt, da auch die Klebefasern bei und nach ihrer Aktivierung als Kleber ihre Faserstruktur und Fasereigenschaften beibehalten.In addition to the connection of the fiber or filament ends with the carrier fleece, these adhesive fibers also create a connection in regions of the pile that lie further inside. This is useful if the pile is outside in the application and is subject to abrasive effects. The softness and suppleness of the pile and its volume are only slightly impaired by this, since the adhesive fibers also retain their fiber structure and properties during and after their activation as an adhesive.

Als Material für die gekräuselten Fasern kommen Polyester, Polypropylen oder Polyacryl in Betracht. Die Materialauswahl kann sich dabei nach der angestrebten Weichheit und nach den wasserabstoßenden oder wasserbenetzbaren Eigenschaften richten, die diese Materialien von sich aus haben.Polyester, polypropylene or polyacrylic can be used as the material for the crimped fibers. The choice of material can vary depending on the desired softness and the water-repellent or water-wettable Straighten properties that these materials inherently have.

Der Flor kann zusätzlich einen Faseranteil aus Naturfasern umfassen. Dabei kommen z. B. als Naturfasern Baumwolle, Viskose, Zellstoff in Betracht. Diese Fasern besitzen natürliche wasserbenetzbare (hydrophile) Eigenschaften und Quellvermögen. Bei Verwendung des Verbundvlieses in Windeln oder Damenbinden als Abdeckung eines Saugkörpers hilft diese Eigenschaft, das Oberflächenvlies der Windel oder Damenbinde schneller trockenzulegen.The pile can additionally comprise a fiber portion made from natural fibers. Here come z. B. as natural fibers cotton, viscose, cellulose. These fibers have natural water-wettable (hydrophilic) properties and swelling properties. When using the composite fleece in diapers or sanitary napkins as a covering of an absorbent body, this property helps to dry the surface fleece of the diaper or sanitary napkin more quickly.

Für das Trägervlies werden bevorzugt bei Erwärmung als Kleber reaktivierbare Fasern Einkomponentenfasern eingesetzt, die aus Polyetylenacrylatcopolymeren bestehen. Diese Material zeichnet sich dadurch aus, daß eine hohe Klebefähigkeit gegenüber unterschiedlichen anderen Materialien besteht und daß die Klebrigkeit bereits bei wesentlich niedrigeren Temperaturen als dem Schmelzpunkt der zu verklebenden Materialien einsetzt.For the carrier nonwoven, reactivable fibers are preferably used when heating as one-component fibers, which consist of polyetylene acrylate copolymers. This material is characterized by the fact that it has a high level of adhesiveness compared to different other materials and that the tackiness starts at temperatures which are substantially lower than the melting point of the materials to be bonded.

Alternativ können als Klebefasern auch Bikomponentenfasern eingesetzt werden, und zwar ausschließlich oder als Anteil zu den Einkomponentenfasern.Alternatively, bicomponent fibers can also be used as adhesive fibers, either exclusively or as a proportion of the one-component fibers.

Bei dem erfindungsgemäßen Verbundvlies besitzt der Flor ein Flächengewicht zwischen 10 und 100 g/m2, vorzugsweise zwischen 30 und 60 g/m2. Dieser Wertebereich ist besonders günstig für den Anwendungsbereich als Abdeckvlies für Windeln, da hierdurch die erforderliche Pufferkapazität zur Flüssigkeitsspeicherung und die Drainagewirkung in Längsrichtung sichergestellt wird.In the composite nonwoven according to the invention, the pile has a basis weight between 10 and 100 g / m 2 , preferably between 30 and 60 g / m 2 . This range of values is particularly favorable for the area of application as a covering fleece for diapers, since this ensures the required buffer capacity for liquid storage and the drainage effect in the longitudinal direction.

Die Erfindung betrifft ferner ein Verfahren zur Herstellung eines Verbundvlieses nach dem Oberbegriff des Anspruchs 10.The invention further relates to a method of manufacture a composite fleece according to the preamble of claim 10.

Diesbezüglich liegt ihr die Aufgabe zugrunde, ein Verfahren zur Herstellung eines Verbundvlieses anzugeben das eine große mechanische Festigkeit ohne Reduktion des Florvolumens erzielt.In this regard, it is the object of the invention to provide a method for producing a composite nonwoven which achieves great mechanical strength without reducing the pile volume.

Diese Aufgabe wird bei einem Verfahren mit den Merkmalen des Oberbegriffs des Anspruchs 10 durch die im Kennzeichen angegebenen Merkmale gelöst.This object is achieved in a method with the features of the preamble of claim 10 by the features specified in the characterizing part.

Bei diesem Verfahren ist es nicht erforderlich, die Fasern oder Filamente des Flor zuvor einem Vliesbildungsprozeß auszusetzen, denn dadurch würde zwangsläufig das Volumen reduziert. Indem die lockere unverfestigte Florschicht an das Trägervlies angeklebt wird, behält sie ihr ursprüngliches Volumen bei. Die mechanische Festigkeit wird hingegen vom Trägervlies übernommen. Durch den Einsatz von Klebefasern wird eine Versiegelung der Klebefläche vermieden. Dadurch wird eine Poriosität, Weichheit und Geschmeidigkeit des Produktes gewahrt.With this method, it is not necessary to subject the fibers or filaments of the pile to a fleece-forming process beforehand, since this would inevitably reduce the volume. By gluing the loose, unconsolidated pile layer to the carrier fleece, it retains its original volume. The mechanical strength, however, is taken over by the carrier fleece. The use of adhesive fibers prevents the adhesive surface from being sealed. This ensures that the product is porous, soft and smooth.

Zweckmäßig werden der Flor und das Trägervlies zusätzlich unter leichter Druckeinwirkung zusammengefügt. Dabei kann der Druck alternativ durch gravierte oder ungravierte Quetschwalzen oder durch die Prallwirkung eines warmen Luftstroms aufgebracht werden. Bei letzterer Ausführung kann der warme Luftstrom gleichzeitig die Energie zur Reaktivierung der Klebefasern liefern.The pile and the carrier fleece are expediently joined together under the action of slight pressure. The pressure can alternatively be applied by engraved or non-engraved squeeze rollers or by the impact of a warm air stream. In the latter version, the warm air flow can simultaneously supply the energy for reactivating the adhesive fibers.

Für die industrielle Herstellung eignen sich zwei alternative Vorgehensweisen. Eine erste Variante sieht vor, daß auf einem Siebband zuerst ein Flor aus gekräuselten Fasern oder Filamenten abgelegt wird, daß anschließend ein in einem simultanen oder gesonderten Prozeß hergestelltes Trägervlies mit Fasern, die bei Erwärmung als Kleber reaktivierbar sind, zugeführt wird und daß das Trägervlies auf den Flor gekräuselter Fasern oder Filamente aufgelegt und mit diesem unter Druck- und Temperatureinwirkung verklebt wird.Two alternative approaches are suitable for industrial production. A first variant provides that first a pile of ruffled on a sieve belt Fibers or filaments is deposited, that a carrier fleece produced in a simultaneous or separate process with fibers that can be reactivated when heated as an adhesive is then fed, and that the carrier fleece is placed on the pile of crimped fibers or filaments and with this under the influence of pressure and temperature is glued.

Bei einer zweiten Variante wird auf einem Siebband- oder Legeband einer Schmelzspinn- oder einer Schmelzblasanlage zuerst ein Trägervlies mit Fasern, die bei Erwärmung als Kleber reaktivierbar sind, hergestellt und anschließend wird auf das Trägervlies ein Flor aus gekräuselten Fasern oder Filamenten aufgebracht, der mit der Oberfläche des Trägervlieses unter Druck- und Temperatureinwirkung verklebt wird.In a second variant, a carrier fleece with fibers that can be reactivated when heated as an adhesive is first produced on a screen belt or laying belt of a melt spinning or meltblowing system, and then a pile of crimped fibers or filaments is applied to the carrier fleece, which with the Surface of the carrier fleece is glued under the influence of pressure and temperature.

Bei beiden Varianten wird also der Flor erst kurz vor der Verklebung erzeugt. Der Flor ist nämlich keiner eigenständigen Existenz fähig und kann nicht - wie es bei einem Vlies möglich wäre - auf Rollen aufgewickelt und zwischengelagert werden. Die eine lockere Schicht bildenden Fasern oder Filamente würden nämlich wieder auseinanderfallen. Lediglich mit Hilfe des Sieb- oder Legebandes gelingt es, die labile Florschicht auch im lockeren Zustand zu transportieren, bis schließlich die Klebeverbindung mit dem Trägervlies für Stabilität sorgt.In both versions, the pile is created just before gluing. The pile is not capable of independent existence and cannot - as would be possible with a fleece - be wound up on rolls and stored temporarily. The fibers or filaments forming a loose layer would fall apart again. It is only possible to transport the unstable pile layer in the loose state with the help of the sieve or laying tape, until finally the adhesive connection with the carrier fleece ensures stability.

Bei einer Weiterbildung können dem Flor bei der Florbildung zusätzlich Klebefasern zugeführt werden. Diese Klebefasern sorgen dann dafür, daß vereinzelt auch Klebeverbindungen in weiter innenliegenden Bereichen des Flor entstehen. Der Flor hält dadurch auch abrasiven Einwirkungen stand. Da die Klebefasern aber nur anteilig zugesetzt werden, bleiben die charakteristischen Eigenschaften des Flor erhalten.In a further development, adhesive fibers can also be added to the pile during pile formation. These adhesive fibers then ensure that there are occasionally also adhesive connections in more inner areas of the pile. The pile also withstands abrasive influences. Since the adhesive fibers are only partially added the characteristic properties of the pile are retained.

Weiterbildungen und vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Ansprüchen, der weiteren Beschreibung und der Zeichnung, anhand der die Erfindung näher erläutert wird.Further developments and advantageous refinements of the invention result from the claims, the further description and the drawing, on the basis of which the invention is explained in more detail.

In der Zeichnung zeigen:

Fig. 1
zeigt einen Schnitt durch ein Verbundvlies,
Fig. 2
eine Vorrichtung einer ersten Ausgestaltung zur Herstellung eines Verbundvlieses und
Fig. 3
eine weitere Alternative einer Vorrichtung zur Herstellung eines Verbundvlieses.
The drawing shows:
Fig. 1
shows a section through a composite fleece,
Fig. 2
a device of a first embodiment for producing a composite fleece and
Fig. 3
another alternative of a device for producing a composite nonwoven.

Fig. 1 zeigt einen Schnitt durch ein Verbundvlies nach der Erfindung. Dieses besteht aus einem voluminösen Flor 10 aus gekräuselten Fasern oder Filamenten und einem Trägervlies 12, das Fasern 14 trägt oder enthält, die bei Erwärmung als Kleber reaktivierbar sind. Die Fasern 14 befinden sich hier auf der dem Flor 10 zugewandten Seite, damit bei Erwärmung nur dort eine Klebeverbindung entsteht. Der Flor besitzt ein Flächengewicht zwischen 10 und 100 g/m2, vorzugsweise zwischen 30 und 60 g/m2.Fig. 1 shows a section through a composite fleece according to the invention. This consists of a voluminous pile 10 made of crimped fibers or filaments and a carrier fleece 12 which carries or contains fibers 14 which can be reactivated as an adhesive when heated. The fibers 14 are located here on the side facing the pile 10, so that an adhesive connection is formed only when heated. The pile has a basis weight between 10 and 100 g / m 2 , preferably between 30 and 60 g / m 2 .

Die Klebefasern 14 zeichnen sich dadurch aus, daß sie bei Erwärmung als Kleber reaktivierbar sind ohne dabei ihre Faserstruktur zu verlieren. Die gekräuselten Fasern oder Filamente des Flor 10 sind mittels der als Kleber reaktivierten Fasern 14 an der Oberfläche des Trägervlieses 12 verklebt.The adhesive fibers 14 are characterized in that they can be reactivated as an adhesive when heated without losing their fiber structure. The crimped fibers or Filaments of the pile 10 are glued to the surface of the carrier fleece 12 by means of the fibers 14 reactivated as an adhesive.

Die Fasern des Flor 10 und die Fasern des Trägervlieses 12 können jeweils den gleichen oder einen unterschiedlichen Oberflächencharakter gegenüber Flüssigkeiten aufweisen. Bei unterschiedlichem Oberflächencharakter besteht die Möglichkeit, daß die Fasern des Flor 10 wasserbenetzbare (hydrophile) und die Fasern des Trägervlieses 12 wasserabstoßende (hydrophobe) Eigenschaften aufweisen. Auch der umgekehrte Fall ist möglich, daß die Fasern des Flor 10 wasserabstoßende (hydrophobe) und die Fasern des Trägervlieses 12 wasserbenetzbare (hydrophile) Eigenschaften aufweisen.The fibers of the pile 10 and the fibers of the carrier fleece 12 can each have the same or a different surface character compared to liquids. With different surface characteristics, there is the possibility that the fibers of the pile 10 have water-wettable (hydrophilic) and the fibers of the carrier fleece 12 have water-repellent (hydrophobic) properties. The reverse case is also possible that the fibers of the pile 10 have water-repellent (hydrophobic) properties and the fibers of the carrier fleece 12 have water-wettable (hydrophilic) properties.

Der Flor 10 kann auch zusätzlich einen Faseranteil umfassen, der bei Erwärmung als Kleber reaktivierbar ist. Als Material für die Fasern oder Filamente des Flor kommen Polyester, Polypropylen oder Polyacryl in Betracht. Das Trägervlies 12 besteht vorzugsweise aus Polyethylen oder Polypropylen . Als Material für die als Kleber reaktivierbaren Fasern 14, die durch Einkomponentenfasern gebildet sind, eignen sich Polyethylenacrylatcopolymere, Polyethylenvinylacetat, ataktisches Polypropylen, gecraftetes Polypropylen, alpha-Polyolephine oder eine Kombination oder Unterkombination aus diesen Stoffen.The pile 10 can also additionally comprise a fiber portion which can be reactivated as an adhesive when heated. Polyester, polypropylene or polyacrylic can be used as the material for the fibers or filaments of the pile. The carrier fleece 12 is preferably made of polyethylene or polypropylene. Polyethylene acrylate copolymers, polyethylene vinyl acetate, atactic polypropylene, crafted polypropylene, alpha-polyolephine or a combination or sub-combination of these substances are suitable as the material for the fibers 14 which can be reactivated as an adhesive and which are formed by one-component fibers.

Die Figuren 2 und 3 zeigen Vorrichtungen zur Herstellung eines Verbundvliese nach der Erfindung. Bei einer in Fig. 1 dargestellten Ausführung werden vorgefertigte gekräuselte Fasern oder Filamente 18 aus einer Karde 16 auf einem Siebband 20 unter Bildung eines Flor 10 abgelegt. Das Siebband 20 transportiert den Flor 10 weiter. Anschließend wird ein in einem simultanen oder gesonderten Prozeß hergestelltes Trägervlies 12 zugeführt. Das Trägervlies 12 wurde zuvor an seiner Oberfläche, die später in Richtung des Flor 10 weist, mit Fasern 14 belegt, die bei Erwärmung als Kleber reaktivierbar sind. Diese Klebefasern 14 können z. B. mittels einer Schmelzblasanlage aufgebracht werden. In Fig. 1 wird das Trägervlies 12 von oben zugeführt. Es ist jedoch auch möglich, das Siebband 20 in zwei unter Bildung eines Spaltes aneinander angrenzende Abschnitte aufzuteilen und das Trägervlies 12 durch den Spalt von unten zuzuführen.Figures 2 and 3 show devices for producing a composite nonwoven according to the invention. In an embodiment shown in FIG. 1, prefabricated crimped fibers or filaments 18 from a card 16 are deposited on a wire belt 20 to form a pile 10. The sieve belt 20 transports the pile 10 further. Subsequently a carrier fleece 12 produced in a simultaneous or separate process is fed. The carrier fleece 12 was previously covered on its surface, which later points in the direction of the pile 10, with fibers 14 which can be reactivated as an adhesive when heated. These adhesive fibers 14 can, for. B. be applied by means of a melt blowing system. In Fig. 1, the carrier fleece 12 is fed from above. However, it is also possible to divide the screen belt 20 into two sections adjoining one another to form a gap and to feed the carrier fleece 12 through the gap from below.

In Fertigungsrichtung schließen sich Quetschwalzen 22 an, die auf die Temperatur zur Aktivierung der Klebefasern 14 aufgewärmt sind und auf die aufeinanderliegenden Schichten des Flor 10 und des Trägervlieses 12 einen leichten Druck ausüben, damit die Klebeverbindung gleichmäßig zustandekommt. Dieser Druck kann wesentlich geringer als bei Vliesbildungsverfahren sein, denn der Flor 10 soll ja nicht verfestigt, sondern nur an das Trägervlies 12 angeklebt werden.In the production direction, squeeze rollers 22 follow, which are warmed up to the temperature for activating the adhesive fibers 14 and exert a slight pressure on the layers of the pile 10 and the carrier fleece 12 lying on top of one another, so that the adhesive connection is achieved evenly. This pressure can be significantly lower than in the case of nonwoven formation processes, because the pile 10 is not intended to be consolidated, but rather only to be adhered to the carrier nonwoven 12.

Da nur ein geringer Druck ausgeübt werden soll, können alternativ oder zusätzlich auch Düsen 24 vorgesehen sein, die warme Luft gegen die Oberfläche des Flor 10 und/oder des Trägervlieses 12 blasen, so daß der Druck durch die Prallwirkung des gleichzeitig die Energie zur Reaktivierung der Klebefasern liefernden Luftstromes aufgebracht wird.Since only a low pressure is to be exerted, nozzles 24 can alternatively or additionally also be provided, which blow warm air against the surface of the pile 10 and / or the carrier fleece 12, so that the pressure due to the impact of the energy at the same time to reactivate the Airflow supplying adhesive fibers is applied.

Bei einer in Fig. 3 dargestellten Ausführung wird auf einem Siebband- oder Legeband 26 einer Schmelzspinn- oder einer Schmelzblasanlage zuerst ein Trägervlies 12 hergestellt und mittels einer Schmelzblasanlage Fasern 14, die bei Erwärmung als Kleber reaktivierbar sind, auf das Trägervlies 12 aufgebracht. Anschließend werden vorgefertigte gekräuselte Fasern oder Filamente 18 einer Karde 16 auf das bereits mit den Klebefasern 14 versehene Trägervlies 12 unter Bildung eines Flor 10 abgelegt.In an embodiment shown in FIG. 3, a carrier fleece 12 is first produced on a wire belt or laying belt 26 of a melt spinning or meltblowing system and fibers 14 which are formed by means of a meltblowing system can be reactivated when heated as an adhesive, applied to the carrier fleece 12. Prefabricated crimped fibers or filaments 18 of a card 16 are then placed on the carrier fleece 12 already provided with the adhesive fibers 14 to form a pile 10.

Daran schließen sich Quetschwalzen 22 an, die auf die Temperatur zur Aktivierung der Klebefasern 14 aufgewärmt sind und wie bereits im Zusammenhang mit der Vorrichtung gemäß Fig. 1 erwähnt, auf die aufeinanderliegenden Schichten des Flor 10 und des Trägervlieses 12 einen leichten Druck ausüben.This is followed by squeeze rollers 22, which are warmed up to the temperature for activating the adhesive fibers 14 and, as already mentioned in connection with the device according to FIG. 1, exert a slight pressure on the layers of the pile 10 and the carrier fleece 12 lying one on top of the other.

Auch bei dieser Vorrichtung können Düsen 24 vorgesehen sein, die warme Luft gegen die Oberfläche des Flor 10 und/oder des Trägervlieses 12 blasen.In this device too, nozzles 24 can be provided which blow warm air against the surface of the pile 10 and / or the carrier fleece 12.

Claims (19)

  1. Composite non-woven fabric, of which one component consists of a bulky nap (10) of crinkled fibres or filaments, characterized in that a further component consists of a support non-woven (12), which carries or contains fibres (14) which, when heated, can be reactivated as adhesive without losing their fibre structure and that the crinkled fibres or filaments of the nap (10) are bonded to the surface of the support non-woven (12) by its fibres (14), reactivated as adhesive.
  2. Composite non-woven fabric according to claim 1, characterized in that the fibres of the nap (10) and the fibres of the support non-woven (12) each have the same or a different surface character with respect to liquids.
  3. Composite non-woven fabric according to claim 2, characterized in that the fibres of the nap (10) have water-wettable (hydrophilic) properties and the fibres of the support non-woven (12) water-repellent (hydrophobic) properties.
  4. Composite non-woven fabric according to claim 2, characterized in that the fibres of the nap (10) have water-repellent (hydrophobic) properties and the fibres of the support non-woven (12) have water-wettable (hydrophilic) properties.
  5. Composite non-woven fabric according to one or more of claims 1 to 4, characterized in that the nap (10) additionally contains a fibre component which, when heated, can be reactivated as adhesive.
  6. Composite non-woven fabric according to one or more of claims 1 to 5, characterized in that the crinkled fibres are of polyester, polypropylene or polyacrylic.
  7. Composite non-woven fabric according to one or more of claims 1 to 6, characterized in that the nap (10) additionally constains a fibre component of natural fibres.
  8. Composite non-woven fabric according to claim 8, characterized in that the natural fibres consist of cotton and/or viscose and/or cellulose.
  9. Composite non-woven fabric according to one or more of claims 1 to 8, characterized in that the fibres (14) that can be reactivated as adhesive when heated are single-component fibres, which consist of polyethylene acrylate copolymers and/or polyethylene vinyl acetate and/or atactic polypropylene and/or grafted polypropylene and/or alpha-polyolephins.
  10. Composite non-woven fabric according to one or more of claims 1 to 6, characterized in that a fibre component that can be reactivated by heating comprises two-component fibres.
  11. Composite non-woven fabric according to one or more of claims 1 to 10, characterized in that the nap (10) has a weight per unit area of from 10 to 100 g/m2, preferably from 30 to 60 g/m2.
  12. Process for the production of a composite non-woven fabric, of which one component consists of a bulky nap of crinkled fibres or filaments, characterized in that a layer of crinkled fibres or filaments is brought into contact with a support non-woven, which carries or contains fibres which, when heated, can be reactivated as adhesive without losing their fibrous structure, at the reactivation temperature of the adhesive fibres.
  13. Process according to claim 12, characterized in that the nap and the support non-woven are joined together additionally by slight pressure action.
  14. Process according to claim 13, characterized in that the pressure is applied by squeezer rolls.
  15. Process according to claim 14, characterized in that the squeezer rolls are engraved or non-engraved.
  16. Process according to claim 13, characterized in that the pressure is applied by the impact effect of a hot air stream, which simultaneously provides the energy for reactivating the adhesive fibres.
  17. Process according to one or more of claims 10 to 16,
    characterized in that, onto a sieve belt, first a nap of crinkled fibres or filaments is laid, that then a support non-woven produced in a simultaneous or separate process and containing fibres which, when heated, can be reactivated as adhesive, is supplied, and that the support non-woven is laid on the nap of crinkled fibres or filaments and is glued to it with the action of pressure and temperature.
  18. Process according to one or more of claims 10 to 16,
    characterized in that, on a sieve belt or laying belt of a melt spinning or melt blowing installation, first a support non-woven comprising fibres which, when heated, can be reactivated as adhesive, is produced, and that then a nap of crinkled fibres or filaments is applied onto the support non-woven, which is glued to the surface of the support non-woven with the action of pressure and temperature.
  19. Process according to one or more of claims 10 to 18,
    characterized in that adhesive fibres are in addition fed to the nap.
EP94906867A 1993-02-20 1994-02-11 Composite nonwoven fabric and process for producing the same Revoked EP0685009B1 (en)

Applications Claiming Priority (3)

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DE4305271A DE4305271C2 (en) 1993-02-20 1993-02-20 Composite fleece and method for producing a composite fleece
DE4305271 1993-02-20
PCT/DE1994/000148 WO1994019524A1 (en) 1993-02-20 1994-02-11 Composite nonwoven fabric and process for producing the same

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EP0685009B1 true EP0685009B1 (en) 1997-04-02

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ES2216184T3 (en) * 1996-12-06 2004-10-16 Weyerhaeuser Company UNITED STRATIFIED COMPOSITE MATERIAL.
DE10127514A1 (en) † 2001-06-06 2003-01-30 Hartmann Paul Ag Composite nonwoven material and process for its production
MX336034B (en) * 2009-08-14 2016-01-07 Procter & Gamble Fibrous structures and method for making same.

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EP0685009A1 (en) 1995-12-06
AU6037294A (en) 1994-09-14
WO1994019524A1 (en) 1994-09-01
DE59402308D1 (en) 1997-05-07
DE4305271C2 (en) 2000-06-08
DE4305271A1 (en) 1994-08-25
ES2102833T3 (en) 1997-08-01

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