EP1392905A1 - Method for consolidating a material web made from wood pulp - Google Patents

Method for consolidating a material web made from wood pulp

Info

Publication number
EP1392905A1
EP1392905A1 EP02740646A EP02740646A EP1392905A1 EP 1392905 A1 EP1392905 A1 EP 1392905A1 EP 02740646 A EP02740646 A EP 02740646A EP 02740646 A EP02740646 A EP 02740646A EP 1392905 A1 EP1392905 A1 EP 1392905A1
Authority
EP
European Patent Office
Prior art keywords
wood pulp
web
fibers
needling
water
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
EP02740646A
Other languages
German (de)
French (fr)
Other versions
EP1392905B1 (en
Inventor
Gerold Fleissner
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
Original Assignee
Fleissner GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fleissner GmbH filed Critical Fleissner GmbH
Publication of EP1392905A1 publication Critical patent/EP1392905A1/en
Application granted granted Critical
Publication of EP1392905B1 publication Critical patent/EP1392905B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—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
    • D04H1/70—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

Definitions

  • EP-A-0 359 615 discloses a method for forming a web of cellulose fibers only, such as wood pulp, which is formed on the wet path and then only dried. There is no consolidation in the sense of intertwining of the fibers there.
  • EP-A-0 308 320 It is known from EP-A-0 308 320 to produce a higher-strength web by adding a further layer of up to 90% wood pulp mixed with staple fibers to a web of continuous filaments that are wet. Both together are then hydrodynamically needled for solidification.
  • US-A-6 110 848 considers a composite to be advantageous if the up to 90% thick wood pulp layer has a backing made of a cardboard staple fiber between 30 and 100 mm.
  • a third fleece made of such staple fibers can complete the compost on the top with the wood pulp layer in the middle. All of this should be solidified hydrodynamically.
  • Such composites are advantageous in some applications, but the artificial fibers deemed necessary do not absorb any moisture, which is why a further product is sought that also has sufficient strength.
  • the invention is therefore based on the object of finding a method for producing a nonwoven that has the highest possible liquid absorption capacity and additionally sufficient strength that ensures that the nonwoven can be used in the respective applications.
  • the nonwoven made of wood pulp after a dry formation process e.g. B. an air laying process dry on an endless belt and should be compressed as usual by suction on the endless belt.
  • the pure wood pulp web i.e. a material web made of 100% wood pulp fibers, is only subjected to hydrodynamic needling for consolidation and then dried.
  • the Wood Pulp fibers were first moistened between two endless belts with a water pressure of 10 bar.
  • the actual solidifying needling was then carried out on one or both sides with only a water pressure of 20 bar.
  • the water pressure should not be chosen too high, a pressure of 15 - 40 bar is advantageous.
  • the sieve chosen for suppression when needling should only have a low permeability of about 10% open area in order to control pulp loss.
  • the wood pulp fibers have a length of 1 - 5 mm.
  • the length depends on the tree, the type of plant.
  • a preferred nonwoven should have fibers have different lengths, preferably also longer than 5 mm long fibers. It was surprisingly found that even these short fiber lengths can be confused with the hydroentanglement in order to produce a nonwoven that is consolidated in all dimensions.
  • the wet and solidified Wood Pulp fleece can be sprayed with a binder before drying, before it is then dried immediately.
  • wood pulp web can also be mixed with other fibers before or after water needling or can be connected to another web made of other fibers such as staple or continuous fibers or also natural fibers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Nonwoven Fabrics (AREA)
  • Paper (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Joining Of Building Structures In Genera (AREA)

Abstract

Production of a non-woven tissue from wood pulp on a wet strip is known. The above has a cardboardy, paper-like feel to it. In order to achieve a web with sufficient resilience, the desired wood pulp fibres used to advantage in the hygiene industry for absorbing liquids are thus always mixed with chemical fibres as support fibres. According to the invention, a consolidated tissue with a soft feel and high fluid absorption is obtained by means of needling a non-woven pure wood pulp tissue with water.

Description

Verfahren zum Verfestigen einer aus Wood Pulp gebildeten WarenbahnProcess for consolidating a web of wood pulp
Durch die EP-A-0 359 615 ist ein Verfahren zum Bilden einer Warenbahn nur aus Zellulosefasern, wie Wood Pulp, bekannt, das auf dem nassen Wege gebildet und dann nur getrocknet wird. Eine Verfestigung in Sinne einer Verschlingung der Fasern untereinander erfolgt dort nicht.EP-A-0 359 615 discloses a method for forming a web of cellulose fibers only, such as wood pulp, which is formed on the wet path and then only dried. There is no consolidation in the sense of intertwining of the fibers there.
Es ist durch die EP-A-0 308 320 bekannt, eine höher verfestigte Warenbahn herzustellen, indem auf eine Warenbahn aus nass gelegten Endlosfilamenten eine weitere Schicht aus bis zu 90 % Wood Pulp vermischt mit Stapelfasern gegeben wird. Beides zusammen wird dann zu Verfestigung hydrodynamisch vernadelt.It is known from EP-A-0 308 320 to produce a higher-strength web by adding a further layer of up to 90% wood pulp mixed with staple fibers to a web of continuous filaments that are wet. Both together are then hydrodynamically needled for solidification.
Ein ähnliches Verfahren offenbart die EP-A-0 373 974, nach der ebenfalls nass gelegte Bahnen aus bis zu 80 % Wood Pulp mit Bahnen jetzt aus Stapelfasern zusammen hydrodynamisch vernadelt werden. Derartige Komposits haben zwar eine höhere Festigkeit, aber die Kapazität zur Aufnahme von Flüssigkeiten ist unbefriedigend.A similar process is disclosed in EP-A-0 373 974, according to which also wet-laid webs of up to 80% wood pulp with webs of staple fibers are now needled together hydrodynamically. Such composites have a higher strength, but the capacity to hold liquids is unsatisfactory.
Auf trockenem Wege diese Komposits zu bilden ist ebenfalls bekannt. Im Zusammenhang mit Endlosfasern ist dazu auf die EP-A-0 492 554 zu verweisen, wo ein Zellstoffgehalt bis zu 90 % mit den Endlosfasern wasservernadelt wird.It is also known to form these composites in a dry way. In connection with continuous fibers, reference should be made to EP-A-0 492 554, where a pulp content of up to 90% is needled with the continuous fibers.
Im Gegensatz dazu sieht die US-A-6 110 848 ein Komposit als vorteilhaft an, wenn die bis zu 90 % mächtige Wood Pulpschicht eine Unterlage aus einem Vlies aus kardierten Stapelfasern zwischen 30 und 100 mm hat. Ein drittes Vlies aus derartigen Stapelfasern kann auf der Oberseite mit der Wood Pulpschicht in der Mitte das Kompost vervollständigen. Alles zusammen soll hydrodynamisch verfestigt werden. Derartige Komposits sind in manchen Anwendungsfällen vorteilhaft, dennoch nehmen die für notwendig gehaltenen künstlichen Fasern keinerlei Feuchtigkeit auf, weswegen nach einem weiteren Produkt gesucht wird, das ebenfalls eine ausreichende Festigkeit aufweist.In contrast, US-A-6 110 848 considers a composite to be advantageous if the up to 90% thick wood pulp layer has a backing made of a cardboard staple fiber between 30 and 100 mm. A third fleece made of such staple fibers can complete the compost on the top with the wood pulp layer in the middle. All of this should be solidified hydrodynamically. Such composites are advantageous in some applications, but the artificial fibers deemed necessary do not absorb any moisture, which is why a further product is sought that also has sufficient strength.
Der Erfindung liegt folglich die Aufgabe zugrunde, ein Verfahren zur Herstellung eines Vlieses zu finden, dass eine höchst mögliche Flüssigkeitsaufnahmefähigkeit aufweist und zusätzlich eine genügende Festigkeit, die gewährleistet, das Vlies in den jeweiligen Anwendungsfällen einsetzen zu können.The invention is therefore based on the object of finding a method for producing a nonwoven that has the highest possible liquid absorption capacity and additionally sufficient strength that ensures that the nonwoven can be used in the respective applications.
Es steht jedenfalls fest, dass das Vlies aus Wood Pulp nach einem trockenen Bildungsverfahren, z. B. einem Luftlegeverfahren trocken auf ein Endlosband abgelegt und wie üblich mittels Saugzug auf dem Endlosband verdichtet werden sollte. Dann ist die reine Wood Pulpbahn, also eine aus 100 % Wood Pulpfasern gebildete Warenbahn zur Verfestigung lediglich mit einer hydrodynamischen Vernadelung zu beaufschlagen und anschließend zu trocknen.In any case, it is certain that the nonwoven made of wood pulp after a dry formation process, e.g. B. an air laying process dry on an endless belt and should be compressed as usual by suction on the endless belt. Then the pure wood pulp web, i.e. a material web made of 100% wood pulp fibers, is only subjected to hydrodynamic needling for consolidation and then dried.
Als Versuchsbedingungen wurde zuerst eine Befeuchtung der Wood Pulpfasern zwischen zwei Endlosbändern mit einem Wasserdruck von 10 bar gewählt. Die eigentliche verfestigende Vernadelung wurde dann ein- oder beidseitig mit nur einem Wasserdruck von 20 bar vorgenommen. Der Wasserdruck sollte nicht zu hoch gewählt werden, vorteilhaft ist ein Druck von 15 - 40 bar. Das zur Unterstürzung gewählte Sieb bei der Vernadelung sollte nur eine geringe Durchlässigkeit von etwa 10 % offene Fläche aufweisen, um einen Pulpverlust zu beherrschen.As the test conditions, the Wood Pulp fibers were first moistened between two endless belts with a water pressure of 10 bar. The actual solidifying needling was then carried out on one or both sides with only a water pressure of 20 bar. The water pressure should not be chosen too high, a pressure of 15 - 40 bar is advantageous. The sieve chosen for suppression when needling should only have a low permeability of about 10% open area in order to control pulp loss.
Überraschend wurde festgestellt, dass der befürchtete Wood Pulp Verlust beim Wasservernadeln mit diesen Bedingung ohne große Bedeutung ist. Dieser ist nämlich Gegenstand der WO 01/14624, wo neben der Trägerschicht aus Chemiefasern vor der Aufgabe der Wood Pulpfasern auf die Chemiefaserträgerschicht zunächst eine Schicht aus Meltblownfasern gegeben wird, um den Wood Pulpverlust beim sich anschließenden hydrodynamischen Verfestigen zu mindern.It was surprisingly found that the feared loss of wood pulp when needling water with this condition is of little importance. This is namely the subject of WO 01/14624, where, in addition to the carrier layer made of synthetic fibers, a layer of meltblown fibers is first applied to the chemical fiber carrier layer before the wood pulp fibers are placed in order to reduce the wood pulp loss during the subsequent hydrodynamic consolidation.
Die Wood Pulpfasem haben eine Länge von 1 - 5 mm. Die Länge hängt von dem Baum, von der Pflanzenart ab. Ein hier bevorzugtes Vlies sollte jedenfalls Fasern unterschiedlicher Länge aufweisen, vorzugsweise auch längere als 5 mm lange Fasern. Überraschend wurde festgestellt, dass sich auch diese nur kurzen Faserlängen mit der Wasserstrahlverfestigung verwirren lassen, um ein in allen Dimensionen verfestigtes Vlies entstehen zu lassen.The wood pulp fibers have a length of 1 - 5 mm. The length depends on the tree, the type of plant. In any case, a preferred nonwoven should have fibers have different lengths, preferably also longer than 5 mm long fibers. It was surprisingly found that even these short fiber lengths can be confused with the hydroentanglement in order to produce a nonwoven that is consolidated in all dimensions.
Das nasse und verfestigte Wood Pulpvlies kann vor dem Trocknen noch mit einem Bindemittel besprüht werden, bevor es dann gleich anschließend getrocknet wird.The wet and solidified Wood Pulp fleece can be sprayed with a binder before drying, before it is then dried immediately.
Selbstverständlich kann die Woodpulp-Bahn auch noch vor oder nach dem Wasservernadeln mit andern Fasern vermischt werden oder mit einer anderen Bahn aus andern Fasern wie Stapel- oder Endlosfasern oder auch natürlichen Fasern verbunden werden. Of course, the wood pulp web can also be mixed with other fibers before or after water needling or can be connected to another web made of other fibers such as staple or continuous fibers or also natural fibers.

Claims

P a t e n t a n s p r ü c e : Patent claims:
1. Verfahren zum Verfestigen einer aus Wood Pulp gebildeten Warenbahn, die nach einem trockenen Bildungsverfahren, z. B. einem Luftlegeverfahren trocken auf ein Endlosband abgelegt wird, dadurch gekennzeichnet, dass eine reine Wood Pulpbahn, dass eine aus 100 % Wood Pulpfasern gebildete Warenbahn zur Verfestigung mit einer hydrodynamischen Vernadelung beaufschlagt und dann lediglich getrocknet wird.1. A method for solidifying a web of wood pulp formed after a dry formation process, for. B. an airlaid process is placed dry on an endless belt, characterized in that a pure wood pulp web that a web formed from 100% wood pulp fibers is applied for consolidation with hydrodynamic needling and then only dried.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Wood Pulpschicht zuerst befeuchtet und dann mit einem Wasserdruck von zwischen 15 - 50 bar vernadelt wird.2. The method according to claim 1, characterized in that the wood pulp layer is first moistened and then needled with a water pressure of between 15 - 50 bar.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass vor dem Trocknen, also nach dem Wasservernadeln auf die verfestigte Pulpbahn ein Bindemittel nass in nass gesprüht wird.3. The method according to claim 1 or 2, characterized in that a binder is sprayed wet on wet before drying, ie after needling water on the solidified pulp web.
4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die zu verfestigende Woodpulp-Bahn mit einem geringen Anteil Stapeloder Endlosfasern, ggf. vorzugsweise Bikomponentenfasem oder auch natürliche Fasern vermischt wird.4. The method according to any one of the preceding claims, characterized in that the wood pulp web to be consolidated is mixed with a small proportion of staple or continuous fibers, optionally preferably bicomponent fibers or natural fibers.
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass der Anteil in einer gesonderten Schicht auf oder unter die Woodpulp-Bahn gelegt wird.5. The method according to claim 4, characterized in that the portion is placed in a separate layer on or under the wood pulp web.
6. Verfahren nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die Woodpulp-Bahn ggf. zusätzlich zusammen mit dem Anteil wasservemadelt wird. 6. The method according to claim 4 or 5, characterized in that the wood pulp web is optionally also water-blasted together with the portion.
EP02740646A 2001-05-30 2002-05-24 Method for consolidating a material web made from wood pulp Expired - Lifetime EP1392905B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10126515A DE10126515A1 (en) 2001-05-30 2001-05-30 Process for consolidating a web of wood pulp
DE10126515 2001-05-30
PCT/EP2002/005697 WO2002097181A1 (en) 2001-05-30 2002-05-24 Method for consolidating a material web made from wood pulp

Publications (2)

Publication Number Publication Date
EP1392905A1 true EP1392905A1 (en) 2004-03-03
EP1392905B1 EP1392905B1 (en) 2009-07-29

Family

ID=7686763

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02740646A Expired - Lifetime EP1392905B1 (en) 2001-05-30 2002-05-24 Method for consolidating a material web made from wood pulp

Country Status (11)

Country Link
US (1) US7293336B2 (en)
EP (1) EP1392905B1 (en)
JP (1) JP2004530060A (en)
KR (1) KR20040025683A (en)
CN (1) CN1520477A (en)
AT (1) ATE437985T1 (en)
BR (1) BR0210935A (en)
CA (1) CA2448937C (en)
DE (2) DE10126515A1 (en)
IL (1) IL158988A0 (en)
WO (1) WO2002097181A1 (en)

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FI20055074A (en) * 2005-02-18 2006-08-19 Suominen Nonwovens Ltd Wet needled nonwoven fabric containing cellulose fibers and process for its preparation
FR2884530B1 (en) * 2005-04-18 2007-06-01 Ahlstrom Res And Services Sa FIBROUS SUPPORT INTENDED TO BE IMPREGNATED WITH LIQUID.
US8250719B2 (en) * 2009-03-03 2012-08-28 The Clorox Company Multiple layer absorbent substrate and method of formation
DE102009032343A1 (en) * 2009-07-09 2011-01-20 Fleissner Gmbh Und Co. Device for solidifying material web made of fiber and/or filaments, comprises filter band, girder duct for fluidic application of material web, and device for compressing fibers and filaments of material web
JP5721523B2 (en) * 2011-04-28 2015-05-20 ユニチカ株式会社 Method for producing antibacterial cellulosic nonwoven fabric
US9394637B2 (en) 2012-12-13 2016-07-19 Jacob Holm & Sons Ag Method for production of a hydroentangled airlaid web and products obtained therefrom

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Also Published As

Publication number Publication date
CN1520477A (en) 2004-08-11
KR20040025683A (en) 2004-03-24
DE10126515A1 (en) 2002-12-05
CA2448937C (en) 2009-07-14
JP2004530060A (en) 2004-09-30
CA2448937A1 (en) 2002-12-05
BR0210935A (en) 2004-06-08
EP1392905B1 (en) 2009-07-29
US7293336B2 (en) 2007-11-13
WO2002097181A1 (en) 2002-12-05
ATE437985T1 (en) 2009-08-15
US20040221437A1 (en) 2004-11-11
IL158988A0 (en) 2004-05-12
DE50213723D1 (en) 2009-09-10

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