WO2002084021A1 - Method and device for producing nonwovens - Google Patents

Method and device for producing nonwovens Download PDF

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Publication number
WO2002084021A1
WO2002084021A1 PCT/EP2001/014823 EP0114823W WO02084021A1 WO 2002084021 A1 WO2002084021 A1 WO 2002084021A1 EP 0114823 W EP0114823 W EP 0114823W WO 02084021 A1 WO02084021 A1 WO 02084021A1
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WO
WIPO (PCT)
Prior art keywords
nonwoven material
binder
additives
material layer
gas stream
Prior art date
Application number
PCT/EP2001/014823
Other languages
German (de)
French (fr)
Inventor
Peter B. Voss
Günter KRAUS
Original Assignee
Faist Automotive Gmbh & Co. Kg
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Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7681078&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2002084021(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Faist Automotive Gmbh & Co. Kg filed Critical Faist Automotive Gmbh & Co. Kg
Priority to DE50101455T priority Critical patent/DE50101455D1/en
Priority to AT01984852T priority patent/ATE259012T1/en
Priority to EP01984852A priority patent/EP1315862B1/en
Publication of WO2002084021A1 publication Critical patent/WO2002084021A1/en

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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
    • 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
    • D04H1/58—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 applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/64—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 applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
    • D04H1/655—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 applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions characterised by the apparatus for applying bonding agents
    • 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
    • D04H1/58—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 applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/587—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 applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives characterised by the bonding agents used
    • 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
    • D04H1/58—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 applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/60—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 applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in dry state, e.g. thermo-activatable agents in solid or molten state, and heat being applied subsequently
    • 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
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper

Definitions

  • the invention relates to a method and an apparatus for producing nonwovens of the type mentioned in the preambles of claims 1 and 6.
  • thermoplastic synthetic resin in powder form after prior metering together with cotton fibers serving as nonwoven material is poured onto a conveyor belt serving as a transport member and fed to a compression station in which the binder is melted by heating and the entire layer is made into a nonwoven belt or a nonwoven mat is pressed.
  • a conveyor belt serving as a transport member
  • a compression station in which the binder is melted by heating and the entire layer is made into a nonwoven belt or a nonwoven mat is pressed.
  • the invention has for its object to provide uniformly formed nonwovens in the simplest possible way, ie to adhere to very low tolerances, for example of the basis weight or other properties of the nonwoven produced. Furthermore, it is desirable to easily achieve such properties by adjusting the proportion of the binding agents. tel and / or other additives to control the nonwoven material.
  • the binder and / or the other additives is inflated and / or blown into a layer of the nonwoven material in a gas stream under a relatively high pressure or at a relatively high flow rate such that a flow component of the binder gas stream flows into the same Direction as the conveying direction of the nonwoven material layer is aligned.
  • the binder is blown with other additives through at least one nozzle onto or into the nonwoven material layer.
  • the angle of attack of the binder gas stream should be up to 60 °, in particular between 0 and 20 °, to the direction of conveyance of the nonwoven material layer.
  • the nonwoven material layer has a layer thickness of approximately 0.1 to 30 cm in the area where the binder gas stream strikes.
  • the pressure at the point of contact can relax in a mixing chamber which widens in cross section, as a result of which even better mixing of the particularly granular and granular binders with the differently structured, namely fibrous nonwoven material can take place.
  • the mixture should flow out of this mixing chamber, in particular via a mel trained feed member fall on the transport member or be advanced there by the feed member.
  • the mixture there forms a band with a width of in particular between 1 and 3 m.
  • nozzles can also be distributed over the width of the nonwoven material layer, since the above-mentioned.
  • Mixing chamber helps to even out the swirled materials. In many applications, however, it is advisable to use a single nozzle with a clear width of between approximately 0.9 and 3.5 m over the entire width of the supplied nonwoven material layer.
  • the invention enables the smallest tolerances of the pressed and possibly deformed fleece to be observed. Up to 35% of the binder and additives can be added to meet certain physical properties, particularly for acoustic applications and dimensional stability, even when the installed fleece has large temperature differences.
  • basis weights of the nonwoven between about 400 and 2500 g / m 2 and density between 50 and 300 kg / m 3 can be achieved with nonwovens, for example, sound absorbing well and densities between 300 and 1500 kg / m 3 for molded parts of motor vehicles, for example, serving as interior linings.
  • torn fibers of cotton and thermoplastic materials as well as bico fibers are used as the nonwoven material.
  • Phenolic resin is particularly preferred as the binder.
  • the proportion of the binder or other additives can be controlled very easily by pre-metering these materials With the help of, for example, dosing screws or dosing belt scales as well as the respective pressure with which the flow rate of the binder gas flow to the nonwoven material layer can be adjusted.
  • FIG. 1 shows a schematic cross section through a device according to the invention
  • FIG. 2 shows a schematic partial section of FIG. 1 in the area of the mixing chamber 13;
  • FIG. 3 shows an enlarged section from the area where the binder gas stream 6 is fed to / into the nonwoven material layer 5 and
  • Figure 4 is a schematic view of the pre-metering of the binder and drive gas.
  • torn cotton fibers or other nonwoven material are fed to the surface of a feed roller serving as a feed member 3, also referred to as a “carding machine”, whose surface has rib-shaped elevations, via a filling funnel serving as the feed member 11 and tapering below as a slot nozzle pressed-on nonwoven material 1 in the form of a nonwoven material layer 5 is conveyed further to the left in the conveying direction F.
  • the conveying roller also serves as a so-called “tear roller” which tears fibers out of the slot nozzle.
  • nozzle 8 with a clear width between 10 and 25 mm as the lower end of the feed member 12 for bin 2.
  • v 20 to 10 m / s binder 2 with the main flow component A from the feed member 12 at a flow speed of, for example, 50 m / sec ejects.
  • D 1 cm.
  • the angle of attack ⁇ between the flow component A and the conveying direction F of the nonwoven material layer 5 in the impact area is preferably approximately 0 to 5 °.
  • the binder grains are almost torn between the fibers of the nonwoven material 1, so that the conveying speed of the fibers increases considerably. Since the clear width of the mixing unit 13 in the mixing chamber 10 increases considerably, the flow rate there decreases considerably, so that the swirled constituents of the fiber material-binder-additives mixture are drawn by the feed element 14 designed as a sieve drum under negative pressure on its surface and can be pushed into a channel formed by baffles 15. The feed element 14 then conveys the mixture layer onto a conveyor belt designed as a transport element 4 with a width of, for example, 2.5 m and a thickness of, for example, 5 cm. The transport member 4 transports the belt 7 of the mixture layer to a pressing station, not shown. There the binder is heated until it melts.
  • the band 7 can be further shaped and / or cut into fleece mats.
  • thermoplastic phenolic resin serving as binder 2 trickles downward from a collecting container 16 in order to reach a metering screw 18 via a screw conveyor 17, in which a pre-metering takes place.
  • the binder 2 leaves the dosing screw 18 via a funnel onto a dosing belt scale 19, in which the fine dosing takes place, in order to be fed from there to a cyclone 20 in free fall, into which air is fed at a high speed of up to 70 m / s.
  • the binder gas stream 6 is generated and then fed to the feed element 12 of the device according to the invention via connecting channels.
  • a wide slot nozzle 8 several, in the example according to FIG. 4, seven individual nozzles can also be distributed over the width of the nonwoven material layer 5.

Abstract

The aim of the invention is to provide a method and device with which the distribution of binders (2) and/or other additives in a nonwoven material layer (5) for the production of nonwovens can be homogenized. To this end, a binder (additive) gas flow (6) is blown onto and/or into a supplied nonwoven material layer (5) at high flow speed. Once the components of this mixture have interlaced to a certain extent, the mixture is deposited as a strip (7) on a transport device (4) and is then fed to a compaction station.

Description

Verfahren und Vorrichtung zur Herstellung von Vliesen Method and device for producing nonwovens
Die Erfindung bezieht sich auf ein Verfahren und eine Vorrichtung zur Herstellung von Vliesen der in den Oberbegriffen der Ansprüche 1 und 6 genannten Gattung.The invention relates to a method and an apparatus for producing nonwovens of the type mentioned in the preambles of claims 1 and 6.
Derartige Verfahren und Vorrichtungen sind bereits bekannt. Dabei wird als Bindemittel thermoplastisches Kunstharz in Pulverform nach vorheriger Dosierung zusammen mit als Vliesmaterial dienenden Baumwollfasern auf einem als Transportorgan dienenden Transportband aufgeschüttet und einer Verpress- station zugeführt, in welcher das Bindemittel durch Erwärmen zum Schmelzen gebracht und die Gesamtschicht zu einem Vliesband bzw. einer Vliesmatte verpresst wird. Es hat sich jedoch gezeigt, daß hierbei beträchtliche Unterschiede des Flächengewichts des hergestellten Vlieses auftraten, was bei Einhaltung enger Toleranz zu grossen Ausschuß bedeutet.Such methods and devices are already known. Thereby, as a binder, thermoplastic synthetic resin in powder form after prior metering together with cotton fibers serving as nonwoven material is poured onto a conveyor belt serving as a transport member and fed to a compression station in which the binder is melted by heating and the entire layer is made into a nonwoven belt or a nonwoven mat is pressed. However, it has been shown that there were considerable differences in the basis weight of the nonwoven produced, which means too much waste if the tolerance is tight.
Der Erfindung liegt die Aufgabe zugrunde, auf möglichst einfache Weise für gleichmäßig ausgebildete Vliese zu sorgen, d.h. sehr geringe Toleranzen beispielsweise des Flächengewichts oder anderer Eigenschaften des hergestellten Vlieses, einzuhalten. Ferner ist es wünschenswert, solche Eigenschaften auf einfache Weise durch Einstellen des Anteils der Bindemit- tel und/oder anderer Zusatzstoffe zum Vliesmaterial steuern zu können .The invention has for its object to provide uniformly formed nonwovens in the simplest possible way, ie to adhere to very low tolerances, for example of the basis weight or other properties of the nonwoven produced. Furthermore, it is desirable to easily achieve such properties by adjusting the proportion of the binding agents. tel and / or other additives to control the nonwoven material.
Die Erfindung ist in den Ansprüchen 1 und 6 gekennzeichnet und in weiteren Unteransprüchen sind bevorzugte Ausbildungen beansprucht. Darüber hinaus werden anhand der Zeichnung im folgenden besonders vorteilhafte Ausbildungen der Erfindung näher beschrieben.The invention is characterized in claims 1 and 6 and preferred embodiments are claimed in further subclaims. In addition, particularly advantageous embodiments of the invention are described in more detail below with reference to the drawing.
Bei der Erfindung wird das Bindemittel und/oder die anderen Zusatzstoffe in einem Gasstrom unter relativ hohem Druck bzw. mit relativ großer Strömungsgeschwindigkeit derart auf- und/oder in eine Schicht aus dem Vliesmaterial geblasen, daß eine Strömungskomponente des Bindesmittel-Gas-Stroms in gleiche Richtung wie die Förderrichtung der Vliesmaterialschicht ausgerichtet ist. Zu diesem Zweck wird das Bindemittel ggf. mit anderen Zusatzstoffen durch mindestens eine Düse auf die Vliesmaterialschicht oder in diese hinein geblasen. Dabei sollte der Anstellwinkel des Bindemittel-Gas-Stroms bis zu 60° insbesondere zwischen 0 und 20°, zur Förderrichtung der Vliesmaterialschicht betragen.In the invention, the binder and / or the other additives is inflated and / or blown into a layer of the nonwoven material in a gas stream under a relatively high pressure or at a relatively high flow rate such that a flow component of the binder gas stream flows into the same Direction as the conveying direction of the nonwoven material layer is aligned. For this purpose, the binder is blown with other additives through at least one nozzle onto or into the nonwoven material layer. The angle of attack of the binder gas stream should be up to 60 °, in particular between 0 and 20 °, to the direction of conveyance of the nonwoven material layer.
Dabei empfiehlt es sich, wenn die Vliesmaterialschicht im Bereich des Auftreffens des Bindemittel-Gas-Stroms eine Schichtdicke von etwa 0,1 bis 30 cm aufweist. Darüber hinaus empfiehlt es sich, wenn sich der Druck an der Stelle des Zusammentreffens in einer sich im Querschnitt aufweitenden Mischkammer entspannen kann, wodurch eine noch bessere Vermischung der insbesondere körnigen und als Granulat ausgebildeten Bindemittel mit dem anders strukturierten, nämlich faserförmigen Vliesmaterial erfolgen kann. Aus dieser Mischkammer sollte das Gemisch insbesondere über ein als Siebtrom- mel ausgebildetes Vorschuborgan auf das Transportorgan fallen bzw. von dem Vorschuborgan dorthin vorgeschoben werden. Das Gemisch bildet dort ein Band einer Breite zwischen insbesondere 1 und 3 m.It is recommended if the nonwoven material layer has a layer thickness of approximately 0.1 to 30 cm in the area where the binder gas stream strikes. In addition, it is advisable if the pressure at the point of contact can relax in a mixing chamber which widens in cross section, as a result of which even better mixing of the particularly granular and granular binders with the differently structured, namely fibrous nonwoven material can take place. The mixture should flow out of this mixing chamber, in particular via a mel trained feed member fall on the transport member or be advanced there by the feed member. The mixture there forms a band with a width of in particular between 1 and 3 m.
Statt einer Düse können auch mehrere Düsen über die Breite der Vliesmaterialschicht verteilt sein, da die o.g. Mischkammer zu einer Vergleichmäßigung der verwirbelten Materialien beiträgt. In vielen Anwendungsfällen empfiehlt sich aber, eine einzige Düse mit einer lichten Breite von zwischen etwa 0 , 9 und 3,5 m über die Gesamtbreite der zugeführten Vliesmaterialschicht.Instead of one nozzle, several nozzles can also be distributed over the width of the nonwoven material layer, since the above-mentioned. Mixing chamber helps to even out the swirled materials. In many applications, however, it is advisable to use a single nozzle with a clear width of between approximately 0.9 and 3.5 m over the entire width of the supplied nonwoven material layer.
Die Erfindung ermöglicht die Einhaltung geringster Toleranzen des verpressten und ggf. verformten Vlieses. So können Bindemittel und Zusatzstoffe bis zu 35% beigemischt sein, um - bestimmten physikalischen Eigenschaften insbesondere für schalltechnische Anwendungen und Formbeständigkeit auch bei starken Temperaturunterschieden des eingebauten Vlieses zu genügen. Dabei sind Flächengewichte des Vlieses zwischen etwa 400 und 2500 g/m2 und Raumgewicht zwischen 50 und 300 kg/m3 bei beispielsweise Schall gut absorbierenden Vliesen und Raumgewichte zwischen 300 und 1500 kg/m3 für beispielsweise als Innenauskleidungen dienende Formteile von Kraftfahrzeugen erreichbar.The invention enables the smallest tolerances of the pressed and possibly deformed fleece to be observed. Up to 35% of the binder and additives can be added to meet certain physical properties, particularly for acoustic applications and dimensional stability, even when the installed fleece has large temperature differences. Here, basis weights of the nonwoven between about 400 and 2500 g / m 2 and density between 50 and 300 kg / m 3 can be achieved with nonwovens, for example, sound absorbing well and densities between 300 and 1500 kg / m 3 for molded parts of motor vehicles, for example, serving as interior linings.
Als Vliesmaterial werden insbesondere vorgerissene Fasern von Baumwolle und thermoplastischen Kunststoffen sowie Biko- Fasern. Bevorzugt als Bindemittel dient insbesondere Phenol- harz .In particular, torn fibers of cotton and thermoplastic materials as well as bico fibers are used as the nonwoven material. Phenolic resin is particularly preferred as the binder.
Der Anteil des Bindemittels bzw. anderer Zusatzstoffe ist sehr leicht steuerbar durch Vordosierung dieser Materialien mit Hilfe von beispielsweise Dosierschnecken oder Dosierbandwaagen sowie auch durch den jeweiligen Druck, mit dem die Zuströmgeschwindigkeit des Bindemittel-Gas-Stromes zur Vliesmaterialschicht eingestellt werden kann.The proportion of the binder or other additives can be controlled very easily by pre-metering these materials With the help of, for example, dosing screws or dosing belt scales as well as the respective pressure with which the flow rate of the binder gas flow to the nonwoven material layer can be adjusted.
In der Zeichnungen zeigen:In the drawings:
Figur 1 einen schematischen Querschnitt durch eine erfindungsgemäße Vorrichtung;1 shows a schematic cross section through a device according to the invention;
Figur 2 einen schematischen Teilausschnitt von Figur 1 im Bereich der Mischkammer 13;FIG. 2 shows a schematic partial section of FIG. 1 in the area of the mixing chamber 13;
Figur 3 einen vergrößerten Ausschnitt aus dem Bereich der Zuführung des Bindemittel-Gas-Stromes 6 an/in die Vliesmaterialschicht 5 undFIG. 3 shows an enlarged section from the area where the binder gas stream 6 is fed to / into the nonwoven material layer 5 and
Figur 4 eine schematische Ansicht der Vordosierung des Bindemittels und Antriebsgases.Figure 4 is a schematic view of the pre-metering of the binder and drive gas.
Gemäß Figur 1, 2 und 3 werden gerissene Baumwollfasern oder anderes Vliesmaterial über einen als Zufuhrorgan 11 dienenden, unten als Schlitzdüse zulaufenden Fülltrichter der Oberfläche einer als Förderorgan 3 dienenden Förderwalze -auch „Karde" genannt- zugeführt, deren Oberfläche rippenförmige Erhebungen aufweist, wodurch das aufgedrückte Vliesmaterial 1 in Form einer Vliesmaterialschicht 5 in Förderrichtung F nach links weiterbefördert wird. Die Förderwalze dient auch als sog. „Reißwalze", die Fasern aus der Schlitzdüse herausreißt.According to FIGS. 1, 2 and 3, torn cotton fibers or other nonwoven material are fed to the surface of a feed roller serving as a feed member 3, also referred to as a “carding machine”, whose surface has rib-shaped elevations, via a filling funnel serving as the feed member 11 and tapering below as a slot nozzle pressed-on nonwoven material 1 in the form of a nonwoven material layer 5 is conveyed further to the left in the conveying direction F. The conveying roller also serves as a so-called “tear roller” which tears fibers out of the slot nozzle.
Dort befindet sich eine Düse 8 mit der lichten Breite zwischen 10 und 25 mm als unterer Abschluß des Zuführorgans 12 für Bin- demittel 2. Zur Düse 8 führt der Zuführkanal 9, durch den ein Gas, insbesondere Luft, mit einer Geschwindigkeit von v = 20 bis 10 m/s Bindemittel 2 mit der Hauptstrδmungskomponente A aus dem Zuführorgan 12 mit einer Strömungsgeschwindigkeit von beispielsweise 50 m/sec ausstößt. An dieser Stelle des Auf- treffens des Bindemittel-Gas-Stromes 6 an und teilweise in die Vliesmaterialschicht 5 weist diese eine Dicke von D = 1 cm auf. Der Anstellwinkel α zwischen der Strömungskomponente A und der Förderrichtung F der Vliesmaterialschicht 5 im Auf- treffbereich beträgt bevorzugt etwa 0 bis 5°. Dabei werden die Bindemittelkörner geradezu zwischen die Fasern des Vliesmaterials 1 hineingerissen, so daß sich die Fördergeschwindigkeit der Fasern erheblich erhöht. Da sich die lichte Breite des Mischaggregats 13 in die Mischkammer 10 hinein erheblich vergrößert, läßt dort die Strömungsgeschwindigkeit erheblich nach, so daß die verwirbelten Bestandteile des Fasermaterial- Bindemittel-Zusatzstoffe-Gemisches durch das als Siebtrommel ausgebildete Vorschuborgan 14 unter Unterdruck an dessen Oberfläche gezogen und von diesem in einen durch Leitbleche 15 gebildeten Kanal hineingeschoben werden. Das Vorschuborgan 14 befördert die Gemischschicht dann auf ein als Transportorgan 4 ausgebildetes Transportband einer Breite von beispielsweise 2,5 m und einer Dicke von beispielsweise 5 cm. Das Transportorgan 4 transportiert das Band 7 der Gemischschicht zu einer nicht dargestellten Verpressstation. Dort wird das Bindemittel bis zum Erschmelzen erwärmt. Da das Bindemittelpulver bzw. Bindemittelgranulat bereits gut mit den Fasern des Vliesmaterials vermischt ist, genügen kurze Vliesstrecken, um beim Ver- pressen und Verfestigen für eine gute und gleichmäßige Bindung der Vliesmaterialteilchen und ggf. weiterer Zusatzstoffe untereinander zu sorgen. In oder nach der Verpressstation kann das Band 7 weiterver- formt und/oder zu Vliesmatten geschnitten werden.There is a nozzle 8 with a clear width between 10 and 25 mm as the lower end of the feed member 12 for bin 2. The feed channel 9 leads to the nozzle 8, through which a gas, in particular air, at a speed of v = 20 to 10 m / s binder 2 with the main flow component A from the feed member 12 at a flow speed of, for example, 50 m / sec ejects. At this point when the binder gas stream 6 strikes and partially into the nonwoven material layer 5, this has a thickness of D = 1 cm. The angle of attack α between the flow component A and the conveying direction F of the nonwoven material layer 5 in the impact area is preferably approximately 0 to 5 °. The binder grains are almost torn between the fibers of the nonwoven material 1, so that the conveying speed of the fibers increases considerably. Since the clear width of the mixing unit 13 in the mixing chamber 10 increases considerably, the flow rate there decreases considerably, so that the swirled constituents of the fiber material-binder-additives mixture are drawn by the feed element 14 designed as a sieve drum under negative pressure on its surface and can be pushed into a channel formed by baffles 15. The feed element 14 then conveys the mixture layer onto a conveyor belt designed as a transport element 4 with a width of, for example, 2.5 m and a thickness of, for example, 5 cm. The transport member 4 transports the belt 7 of the mixture layer to a pressing station, not shown. There the binder is heated until it melts. Since the binder powder or binder granulate is already well mixed with the fibers of the nonwoven material, short nonwoven stretches are sufficient to ensure good and uniform bonding of the nonwoven material particles and possibly other additives to one another during compression and consolidation. In or after the pressing station, the band 7 can be further shaped and / or cut into fleece mats.
Gemäß Figur 4 rieselt als Bindemittel 2 dienendes thermoplastisches Phenolharz aus einem Sammelbehälter 16 nach unten, um über eine Förderschnecke 17 zu einer Dosierschnecke 18 zu gelangen, bei der eine Vordosierung stattfindet. Das Bindemittel 2 verläßt die Dosierschnecke 18 über einen Trichter auf eine Dosierbandwaage 19, in der die Feindosierung erfolgt, um von dort im freien Fall einem Zyklon 20 zugeführt zu werden, in den Luft mit hoher Geschwindigkeit von bis zu 70 m/s zugeleitet wird. Hier wird der Bindemittel-Gas-Strom 6 erzeugt und dann über Verbindungskanäle dem Zuführorgan 12 der erfindungs- gemäßen Vorrichtung zugeführt zu werden. Anstelle einer breiten Schlitzdüse 8 können auch mehrere, bei dem Beispiel nach Figur 4, sieben Einzeldüsen über die Breite der Vliesmaterialschicht 5 verteilt werden. According to FIG. 4, thermoplastic phenolic resin serving as binder 2 trickles downward from a collecting container 16 in order to reach a metering screw 18 via a screw conveyor 17, in which a pre-metering takes place. The binder 2 leaves the dosing screw 18 via a funnel onto a dosing belt scale 19, in which the fine dosing takes place, in order to be fed from there to a cyclone 20 in free fall, into which air is fed at a high speed of up to 70 m / s. Here, the binder gas stream 6 is generated and then fed to the feed element 12 of the device according to the invention via connecting channels. Instead of a wide slot nozzle 8, several, in the example according to FIG. 4, seven individual nozzles can also be distributed over the width of the nonwoven material layer 5.

Claims

ANSPRUCHSFASSUNG CLAIM RESOLUTION
1. Verfahren zur Herstellung von Vliesen, bei dem insbesondere faserförmiges Vliesmaterial (1) mit insbesondere körnigem Bindemittel (2) und/oder anderen Zusatzstoffen auf einem insbesondere bandförmigen Transportorgan (4) ausgebreitet wird und einer Verpressstation zuführbar ist, in der das Gemisch aus Vliesmaterial und Bindemittel/Zusatzstoffen im erwärmten Zustand zu einer Vliesbahn oder zu einer Vliesmatte verpresst wird, d a d u r c h g e k e n n z e i c h n e t, daß das Bindemittel (2) und/oder die anderen Zusatzstoffe in einem Gasstrom unter hohem Druck bzw. mit hoher Strömungsgeschwindigkeit derart auf und/oder in eine Schicht (5) aus Vliesmaterial (1) geblasen wird, daß eine Strömungskomponente (A) des Bindemittel-Gas-Stromes (6) in gleicher Richtung wie die Förderrichtung (F) der Vliesmaterialschicht (5) auf insbesondere einem Förderorgan (3) ausgerichtet ist.1. A method for producing nonwovens, in which in particular fibrous nonwoven material (1) with in particular granular binder (2) and/or other additives is spread out on a particularly belt-shaped transport member (4) and can be fed to a pressing station in which the mixture of nonwoven material and binders/additives are pressed in the heated state into a non-woven web or a non-woven mat, so that the binder (2) and/or the other additives are in a gas stream under high pressure or with a high flow velocity in such a way on and/or into a layer (5) is blown from nonwoven material (1) so that a flow component (A) of the binder gas stream (6) is aligned in the same direction as the conveying direction (F) of the nonwoven material layer (5), in particular on a conveyor element (3).
2. Verfahren nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, daß der Anstellwinkel α zwischen der Förderrichtung (F) der Vliesmaterialschicht (5) und dem Bindemittel-Gas-Strom (6) an der Stelle von dessen Zusammentreffen mit der Vliesmaterialschicht (5) bis zu 60° gewählt wird.2. The method according to claim 1, characterized in that the angle of attack α between the conveying direction (F) of the nonwoven material layer (5) and the binder gas stream (6) at the point where it meets the Fleece material layer (5) is selected up to 60°.
3. Verfahren nach Anspruch 2 , d a d u r c h g e k e n n z e i c h n e t, daß der Anstellwinkel α zwischen 0 und 20° gewählt wird.3. The method according to claim 2, so that the angle of attack α is selected between 0 and 20 °.
4. Verfahren nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t, daß der Anteil des Bindemittels (2) in Bezug zum Vliesmaterial (1) durch Steuerung der Bindemittelzugäbe zum Gasstrom dosiert wird.4. The method according to one of the preceding claims, so that the proportion of the binder (2) in relation to the nonwoven material (1) is metered by controlling the addition of binder to the gas stream.
5. Verfahren nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e , daß der Bindemittel-Gas-Strom (6) unter hohem Druck in einen Bereich der ausgebreiteten Vliesmaterialschicht (5) eingeblasen wird, der eine geringe Schichtdicke (D) zwischen etwa 0,1 und 30 cm aufweist, und anschließend der Druck wesentlich vermindert wird, ehe das Gemisch aus Bindemittel (2) und Vliesmaterial (1) auf einem Transportorgan (4) ausgebreitet wird.5. The method according to one of the preceding claims, characterized in that the binder gas stream (6) is blown under high pressure into an area of the spread nonwoven material layer (5) which has a small layer thickness (D) between approximately 0.1 and 30 cm, and then the pressure is significantly reduced before the mixture of binder (2) and nonwoven material (1) is spread out on a transport member (4).
5. Vorrichtung zur Herstellung von Vliesen mit einem Zufuhrorgan (11) für Vliesmaterial (1) , mit einem Zufuhrorgan (12) für Bindemittel (2) und/oder andere Zusatzstoffe, mit einem Mischaggregat (13) zum Vermischen des Vliesmaterials (1) mit dem Bindemittel (2) und mit einem Transportorgan (4) , von dem das Gemisch des Vliesmaterials (1) und des Bindemittels (2) und ggf. anderen Zusatzstoffen insbesondere bandförmig einer Verpressstation zuführbar ist, in der das Gemisch zu einer Vliesbahn oder Vliesmatte ggf. unter Erwärmung verpressbar ist, d a du r c h g e k e n n z e i c h n e t, daß das Zuführorgan (12) für das Bindemittel (2) bzw. andere Zusatzstoffe als ein mindestens zu einer Düse (8) führender Zuführkanal (9) ausgebildet ist, durch den ein unter hohem Druck stehender und/oder hoher Geschwindigkeit zugeführter Gasstrom das Bindemittel (2) mitreißt, und daß die Düse (8) den Bindemittel -Gas-Strom 5. Device for producing nonwovens with a feed member (11) for nonwoven material (1), with a feed member (12) for binders (2) and / or other additives, with a mixing unit (13) for mixing the nonwoven material (1). the binder (2) and with a transport member (4), from which the mixture of the non-woven material (1) and the binder (2) and possibly other additives can be fed, in particular in band form, to a pressing station, in which the mixture is optionally formed into a non-woven web or non-woven mat . can be pressed under heating, since you have indicated that the feed element (12) for the binding agent (2) or other additives is designed as a feed channel (9) leading to at least one nozzle (8), through which a feed channel (9) is supplied under high pressure and/or at high speed Gas stream entrains the binder (2), and that the nozzle (8) carries the binder gas stream
(6) mit einer Strömungskomponente (A) unter einem Anstellwinkel α von bis zu 60° zur Bewegungsrichtung (F) einer Vliesmaterial- schicht (5) auf und/oder in das Vliesmaterial (1) einbläst bzw. mit diesem vermischt.(6) with a flow component (A) at an angle of attack α of up to 60 ° to the direction of movement (F) of a nonwoven material layer (5) blows onto and/or into the nonwoven material (1) or mixed with it.
7. Vorrichtung nach Anspruch 6, d a d u r c h g e k e n n z e i c h n e t, daß ein Förderorgan (3) die Vliesmaterialschicht (5) in Richtung zur Düse (8) fördert.7. Device according to claim 6, characterized in that a conveyor element (3) conveys the nonwoven material layer (5) in the direction of the nozzle (8).
8. Vorrichtung nach Anspruch 7, d a d u r c h g e k e n n z e i c h n e t, daß das Förderorgan (3) als Förderwalze und gegebenenfalls als Reißwalze ausgebildet ist.8. Device according to claim 7, characterized in that the conveying element (3) is designed as a conveyor roller and optionally as a tearing roller.
9. Vorrichtung nach einem Ansprüche 6 bis 8, d a d u r c h g e k e n n z e ic n e t, daß die Düse (8) im Eingangsbereich einer Mischkammer (10) angeordnet ist, deren Querschnitt sich vom Düsenbereich ausgehend insbesondere kontinuierlich bis zu einem Vorschuborgan (14) vergrößert, daß das Gemisch aus dem Vliesmaterial (1) und dem Bindemittel (2) und ggf. anderen Zusatzstoffen als Band (7) auf dem Transportorgan (4) ausbreitet . 9. Device according to one of claims 6 to 8, characterized in that the nozzle (8) is arranged in the entrance area of a mixing chamber (10), the cross section of which increases, starting from the nozzle area, in particular continuously up to a feed element (14), so that the mixture made of the nonwoven material (1) and the binder (2) and possibly other additives as a belt (7) on the transport member (4).
10.Vorrichtung nach einem der Ansprüche 6 bis 9, d a d u r c h g e k e n n z e i c h n e t, daß die Düse (8) eine lichte Breite zwischen 5 und 30 mm aufweist .10.Device according to one of claims 6 to 9, characterized in that the nozzle (8) has a clear width between 5 and 30 mm.
11.Vorrichtung nach einem der Ansprüche 6 bis 10, d a d u r c h g e k e n n z e i c h n e t, daß das Band (7) eine Breite zwischen 1 und 3 m auf einem als Transportorgan (4) dienenden Transportband aufweist.11. Device according to one of claims 6 to 10, characterized in that the belt (7) has a width of between 1 and 3 m on a conveyor belt serving as a transport element (4).
12.Vorrichtung nach einem der Ansprüche 6 bis 11, d a d u r c h g e k e nn z e i c h n e t, daß das Bindemittel (2) über eine Dosierschnecke (18) und/ oder eine Dosierbandwaage (19) dosiert in ein Zyklonaggregat (20) mit dem unter Druck stehenden Gas mischbar ist und von dort unter Druck zum Zufuhrkanal (9) gelangt.12. Device according to one of claims 6 to 11, so that the binding agent (2) can be mixed with the pressurized gas via a metering screw (18) and / or a metering belt scale (19) in a cyclone unit (20). and from there it reaches the supply channel (9) under pressure.
13.Vorrichtung nach einem der Ansprüche 6 bis 12, d a d u r c h g e k e n n z e i c h n e t, daß mehrere Düsen (3) über die Breite der Vliesmaterial- schicht (5) verteilt sind. 13. Device according to one of claims 6 to 12, characterized in that a plurality of nozzles (3) are distributed over the width of the nonwoven material layer (5).
PCT/EP2001/014823 2001-04-10 2001-12-14 Method and device for producing nonwovens WO2002084021A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE50101455T DE50101455D1 (en) 2001-04-10 2001-12-14 METHOD AND DEVICE FOR PRODUCING FLEECES
AT01984852T ATE259012T1 (en) 2001-04-10 2001-12-14 METHOD AND DEVICE FOR PRODUCING NON-WOVENS
EP01984852A EP1315862B1 (en) 2001-04-10 2001-12-14 Method and device for producing nonwovens

Applications Claiming Priority (2)

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DE10117864A DE10117864A1 (en) 2001-04-10 2001-04-10 The assembly for the production of a nonwoven, has a feed for a bonding agent to be delivered with a high speed gas stream into the fiber layer, to be formed into a web laid on a conveyor belt
DE10117864.6 2001-04-10

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WO2002084021A1 true WO2002084021A1 (en) 2002-10-24

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AT (1) ATE259012T1 (en)
DE (3) DE10117864A1 (en)
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US6802353B2 (en) 2001-10-10 2004-10-12 The Procter & Gamble Company Apparatus for recycling waste from an absorbent article processing line

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US4018646A (en) * 1973-05-09 1977-04-19 Johnson & Johnson Nonwoven fabric
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DE50101455D1 (en) 2004-03-11
EP1315862A1 (en) 2003-06-04
DE20108379U1 (en) 2002-08-14
DE10117864A1 (en) 2002-10-17
ATE259012T1 (en) 2004-02-15
ES2210190T3 (en) 2004-07-01

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