EP3177459B1 - Method for producing spunbonded fabric - Google Patents

Method for producing spunbonded fabric Download PDF

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Publication number
EP3177459B1
EP3177459B1 EP15745444.8A EP15745444A EP3177459B1 EP 3177459 B1 EP3177459 B1 EP 3177459B1 EP 15745444 A EP15745444 A EP 15745444A EP 3177459 B1 EP3177459 B1 EP 3177459B1
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EP
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Prior art keywords
threads
spunbonded
deposits
belt
longitudinal
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EP15745444.8A
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German (de)
French (fr)
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EP3177459A1 (en
Inventor
Uwe Köckritz
Jürgen ABRAHAM
Antony Morton
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Voith Patent GmbH
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Voith Patent 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
    • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D3/00—Woven fabrics characterised by their shape
    • D03D3/04—Endless fabrics

Definitions

  • the present invention relates to a process for the production of spunbond web with a fabric tape.
  • the fabric tape comprises a plurality of longitudinal yarns extending substantially in a belt longitudinal direction and a plurality of transverse yarns extending substantially in a belt transverse direction, the longitudinal yarns setting at tie points with the transverse yarns and vertex regions of the longitudinal yarns formed on a sheet material contact side, wherein a plurality of the sheet material contact side is provided by deposits at least on the longitudinal threads.
  • a fabric tape that can be used, for example, in a dry section of a paper machine.
  • the fabric tape is formed with longitudinal yarns extending in a tape longitudinal direction, which generally corresponds to a machine direction, and extending transverse yarns in a tape transverse direction, which generally corresponds to a cross machine direction.
  • the longitudinal threads bind to transverse threads, ie, intersect these, wherein in the region of these tie points crest areas of the longitudinal threads are formed, in particular also vertex areas are formed on a web material contact side.
  • Deposits are provided in the region of these web material-contact-side apex regions of the longitudinal threads and also the corresponding web-material contact-side apices of the transverse threads, which are each elongated in the direction of the threads on which they are provided. These deposits made of silicone material serve to improve the sheet guiding characteristic, but at the same time the air permeability of the belt should not be impaired.
  • this object is achieved by a method for producing spunbonded nonwoven webs comprising a webbing comprising applying spunbonded filaments to the web contact side of the webbing belt moving in a webmoving direction in at least one, preferably a plurality of spunbonded web landing regions following each other in the webmoving direction.
  • the fabric tape comprises a plurality of longitudinal threads running essentially in a band longitudinal direction and a plurality of transverse threads extending substantially in a transverse direction of the band, wherein the longitudinal threads set at setting points with the transverse threads and apex areas of the longitudinal threads are formed on a web contact side, wherein on the web material contact side Variety of deposits is provided at least on the longitudinal threads.
  • the deposits provided on the fabric tape in the sense of the present invention are formed by material applied specifically to the threads of the fabric tape and not by materials adhering to the thread surface, for example in the web material production operation, in particular contaminants.
  • a further reinforcement of the entrainment interaction by increasing the surface provided for the application of web material can be achieved by providing at least two adjacent longitudinal threads touching deposits.
  • the areas in which deposits are present in the fabric tape constructed according to the invention are therefore not limited to individual threads, but also include cross-thread surface areas.
  • the deposits with an areal density in the range of 5 to 500, preferably about 50 to 200, deposits / cm 2 are provided.
  • the deposits may be provided in the fabric tape that the deposits with an areal density in the range of 5 to 500, preferably about 50 to 200, deposits / cm 2 .
  • at least 80% of the deposits have an extension length in the band longitudinal direction in the range of 250 to 2500, preferably about 1000 to 1500, microns.
  • At least 80% of the deposits may have a maximum protrusion height over the filaments supporting them in the range of 50 to 500, preferably about 100 to 250, microns.
  • At least a part of, preferably all, longitudinal threads and / or transverse threads are constructed with polyester (PET) material.
  • a part of the transverse threads may be constructed to prevent electrostatic charging with electrically conductive material.
  • so-called two-component yarns are advantageous, which comprise a constructed for example with PA material core and a sheath of PA material, which contains so-called carbon nanotubes.
  • the deposits can be designed to obtain an efficient entrainment interaction with silicone material or PU material.
  • the fabric tapes used for the production of spunbonded fabric generally have a total length in the tape longitudinal direction which is greater than its width, that is to say the extension length in the tape transverse direction.
  • the longitudinal threads are warp threads and the transverse threads are weft threads.
  • spiral connecting elements or a woven fabric seam or the like are conceivable.
  • the increased entrainment interaction provided with the fabric tape is particularly advantageous Wear, as applied in one or more spunbond strand application areas, generally very thin spunbonded filaments or filaments are very light and in the manufacturing process in principle there is a risk that too low entrainment interaction, the generally existing air turbulence peeling the on the web contact side of a effect spunbonded threads applied to such fabric bands.
  • each spunbonded filament application region comprises a multiplicity of spunbonded nonwoven filament extrusion nozzles in the strip transverse direction for dispensing spunbonded filaments onto the web contact side of the fabric tape.
  • spunbonded filaments are formed which are formed on at least one thread surface with PP material, and that the fabric tape is moved at a speed of at least 600 m / min in the tape moving direction and in an upstream one , spunbonded nonwoven filament application region spunbonded filaments having a basis weight of at most, preferably less than, 4 g / m 2 are applied to the web material contact side of the fabric tape.
  • the driving interaction achievable with the fabric tape provided according to the invention makes it possible to work with a comparatively high production speed of 600 m / min or more, but at the same time a comparatively small amount of spunbonded filaments, in particular in the upstream, first spunbonded filament application region.
  • This area is particularly critical since the weight per unit area of the spunbonded fabric increases only in subsequent spunbonded filament application areas, ie further downstream in the production process, and thus correspondingly decreases the risk of detachment of the spunbonded fabric produced in this way.
  • the spunbonded filaments applied to the fabric tape or its web contact side in the first spunbonded filament application region are entrained in the tape movement direction by the deposits to be provided according to the invention, without any substantial risk of detachment.
  • spunbonded filaments are applied, which are formed at least on a thread surface with PE material, and that the fabric tape is moved at a speed of at least 300 m / min in the tape movement direction and in an upstream, first Spunbonded filament application area Spunbonded filaments having a weight per unit area of at most, preferably less than, 8 g / m 2 are applied to the web material contact side of the fabric band.
  • spunbonded fabric which is constructed on its surface with PE material, can be applied by the inventive application of deposits on a fabric tape with comparatively high speed and comparatively low basis weight of the spunbonded yarn application area to be applied spunbonded filaments or the thus produced Able to be worked by spunbonded threads.
  • FIG. 3 shows a section of a fabric tape, generally designated 10, which can be used in an endless configuration in the manufacture of spunbonded fabric.
  • the fabric tape 10 comprises a multiplicity of longitudinal threads 12 running side by side in a tape longitudinal direction L and a multiplicity of transverse threads 14 running side by side in a tape transverse direction Q. Since the fabric tape 10 is generally provided by a seam region, spiral fasteners or the like as an endless belt, it is advantageous to when the longitudinal threads 12 are provided by warp threads and the transverse threads 14 by weft threads.
  • the fabric belt 10 moves in the direction of the longitudinal yarns 12, ie in the longitudinal direction L, which then also corresponds to the tape movement direction, generally a machine direction, while the transverse direction Q corresponds to a cross-machine direction.
  • a portion of a web contact side of webbing 10, generally designated 16, is shown.
  • the spunbonded filaments dispensed from spunbonded filament extrusion nozzles in individual spunbonded filament application regions are applied in the spunbond production process.
  • the tape movement direction ie the longitudinal direction L consecutively z.
  • B. bar-like formed spunbonded yarn application areas, each having a plurality of in the Tape transverse direction Q consecutive spunbonded yarn extrusion nozzles include.
  • spunbonded filaments also referred to as spunbond filaments
  • spunbond filaments a layer of spunbonded filaments, also referred to as spunbond filaments, is applied, so that at the end of this application process a spunbonded web is produced with a plurality of layers of spunbonded filaments laid one on top of the other.
  • the spunbonded fabric produced in this way can be lifted off the fabric band 10 and, for example, consolidated by pressing in a calendering process.
  • the deposits 22 will have an elongated contour substantially in this direction of manufacture, that is, the longitudinal direction L.
  • the deposits 22 are not only present in the fabric band 10 in apex regions 20, but are provided in particular on the longitudinal yarns 12 between vertex regions 22 in such a way that at least a portion of the deposits 22 provided between crest regions 20 does not extend into vertex regions. like this in Fig. 2
  • the deposition 22 1 is the case.
  • the deposit 22 2 does not extend into a vertex area 20. It can be seen that this deposit 22 2 is in contact with two longitudinal threads 12.
  • Identifiable deposit 22 3 also extends into an apex region 20 and is asymmetrical with respect to its vertex center Z in the band longitudinal direction. It should be noted that the vertex Z is the length center of each vertex portion 20 in the longitudinal direction L.
  • the or a part of the deposits 22 have the in Fig. 2 on the basis of the deposit 22 3 recognizable structure in which a strong asymmetry with respect to the apex Z is present. At least 70%, preferably at least 80%, of the volume of this deposit 22 3 lies on one side in the web longitudinal direction with respect to the apex center Z. This shaping with the nonselective protrusion or end regions 24 of such deposits 22 3 formed by the strong asymmetry can be achieved by the preceding deposition process be achieved with the production direction in the longitudinal direction L.
  • the deposits 22 are provided in the fabric band 10 preferably distributed over the entire web material contact side 16 with an areal density in the range of 5 to 500, preferably about 50 to 200, deposits / cm 2 .
  • the deposits with a in the tape longitudinal direction L elongated contour are provided, wherein advantageously at least 80% of these deposits 22 in the tape longitudinal direction have an extension length in the range of 250 to 2500, preferably about 1000 to 1500, microns.
  • the deposits 22 have a maximum projection height H over the filaments supporting them, here for example longitudinal filaments 12, in the range from 50 to 500, preferably about 100 to 250 microns.
  • the total surface, which can interact with the spunbonded nonwoven filaments to be entrained, is increased.
  • the surface roughness of the fabric tape 10 is increased at the web contact side 16, so that, for example, starting from a roughness Ra of 250 to 300 microns after coating or deposition of the deposits roughness Ra may be about 290 to 350 microns ,
  • the possibility is created to work in the spunbond production process with comparatively high speed of the fabric tape 10 in the tape movement direction, generally the tape longitudinal direction L, but also comparatively thin layers of spunbonded filaments applied in the various spunbonded yarn application areas, so as to be able to produce a spunbonded fabric with a comparatively filigree structure.
  • the fabric tape provided according to the invention can be worked at a speed of at least 600 m / min, wherein spunbonded filaments having a total basis weight of less than 4 g / m 2 can be applied to the web material contact side 16 of the fabric tape 10.
  • a spunbonded nonwoven web is to be produced whose spunbonded fibers are constructed with PE material at least on its thread surface, which has a lower static friction coefficient with respect to the threads of the fabric strip 10 which are generally constructed of polymer material
  • the fabric strip 10 described above can nevertheless be manufactured with a comparatively high production rate of At least 300 m / min are worked, at the same time in particular in the upstream, first spunbond strand application area spunbonded filaments with a basis weight of less than 8 g / m 2 can be applied without the risk of lifting or detachment of this first layer of spunbonded filaments, due to the turbulence arising in the manufacturing process, exists.
  • spunbonded filaments which are constructed on their thread surface with PP material, generally in their entire volume range of PP material
  • spunbonded filaments which are constructed on their thread surface with PE material, either completely, ie in the entire volume range, made of PE -Material consist, or may be formed as a so-called sheath-core threads or filaments, for example, a core of PP material and a sheath surrounding this PE material may include.
  • Such threads or filaments are also referred to as two-component threads.
  • the longitudinal threads or at least a portion of the longitudinal threads may, for. B. are provided as PET monofilaments, ie threads which are constructed over their entire cross section with the same material.
  • Part of the transverse threads can be constructed to avoid electrostatic charges with electrically conductive material.
  • a sheath-core structure may be provided in which a core of PA material is surrounded by a sheath of so-called carbon nanotubes containing PA material.
  • transverse threads as well as transverse threads of different types can be combined with each other in the fabric band.
  • transverse threads which are electrically conductive, in order to avoid the formation of electrostatic charges in the generally dry-running spunbonding production process.

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Spinnvlies mit einem Gewebeband. Das Gewebeband umfasst eine Mehrzahl von im Wesentlichen in einer Bandlängsrichtung verlaufenden Längsfäden und eine Mehrzahl von im Wesentlichen in einer Bandquerrichtung verlaufenden Querfäden, wobei die Längsfäden an Abbindepunkten mit den Querfäden abbinden und an einer Bahnenmaterialkontaktseite Scheitelbereiche der Längsfäden gebildet sind, wobei an der Bahnenmaterialkontaktseite eine Vielzahl von Ablagerungen wenigstens an den Längsfäden vorgesehen ist.The present invention relates to a process for the production of spunbond web with a fabric tape. The fabric tape comprises a plurality of longitudinal yarns extending substantially in a belt longitudinal direction and a plurality of transverse yarns extending substantially in a belt transverse direction, the longitudinal yarns setting at tie points with the transverse yarns and vertex regions of the longitudinal yarns formed on a sheet material contact side, wherein a plurality of the sheet material contact side is provided by deposits at least on the longitudinal threads.

Aus der US 7,172,982 B2 ist ein Gewebeband bekannt, das beispielsweise in einer Trockensektion einer Papiermaschine eingesetzt werden kann. Das Gewebeband ist mit in einer Bandlängsrichtung, welche im Allgemeinen einer Maschinenrichtung entspricht, sich erstreckenden Längsfäden und in einer Bandquerrichtung, welche im Allgemeinen einer Quermaschinenrichtung entspricht, sich erstreckenden Querfäden ausgebildet. In der Gewebestruktur binden die Längsfänden an Querfäden ab, d. h. kreuzen diese, wobei im Bereich dieser Abbindepunkte Scheitelbereiche der Längsfäden gebildet sind, insbesondere auch Scheitelbereiche an einer Bahnenmaterialkontaktseite gebildet sind. Im Bereich dieser bahnenmaterialkontaktseitigen Scheitelbereiche der Längsfäden und auch den entsprechenden bahnenmaterialkontaktseitigen Scheitelbereichen der Querfäden sind Ablagerungen vorgesehen, welche jeweils in Richtung der Fäden, auf welchen sie vorgesehen sind, langgestreckt sind. Diese aus Silikonmaterial aufgebauten Ablagerungen dienen dazu, die Bahnenmaterialführungscharakteristik zu verbessern, wobei gleichzeitig jedoch die Luftdurchlässigkeit des Bands nicht beeinträchtigt werden soll.From the US 7,172,982 B2 For example, a fabric tape is known that can be used, for example, in a dry section of a paper machine. The fabric tape is formed with longitudinal yarns extending in a tape longitudinal direction, which generally corresponds to a machine direction, and extending transverse yarns in a tape transverse direction, which generally corresponds to a cross machine direction. In the fabric structure, the longitudinal threads bind to transverse threads, ie, intersect these, wherein in the region of these tie points crest areas of the longitudinal threads are formed, in particular also vertex areas are formed on a web material contact side. Deposits are provided in the region of these web material-contact-side apex regions of the longitudinal threads and also the corresponding web-material contact-side apices of the transverse threads, which are each elongated in the direction of the threads on which they are provided. These deposits made of silicone material serve to improve the sheet guiding characteristic, but at the same time the air permeability of the belt should not be impaired.

Der Vollständigkeit halbe sei ferner auch noch auf die Druckschriften GB 1 058 616 A , EP 1 749 653 A2 , WO 2005/013873 A1 und US 4 981 745 A hingewiesen.The completeness half is also on the pamphlets GB 1 058 616 A . EP 1 749 653 A2 . WO 2005/013873 A1 and US 4,981,745 A pointed.

Es ist die Aufgabe der vorliegenden Erfindung, ein Verfahren zur Herstellung von Spinnvlies mit einem Gewebeband vorzusehen, welches eine verbesserte Führungs- bzw. Mitnahmecharakteristik für das mit einem derartigen Gewebeband herzustellende Bahnenmaterial aufweist.It is the object of the present invention to provide a method for producing spunbonded fabric with a fabric tape, which has an improved guiding or entrainment characteristic for the web material to be produced with such a fabric tape.

Erfindungsgemäß wird diese Aufgabe gelöst durch ein Verfahren zur Herstellung von Spinnvlies mit einem Gewebeband, umfassend das Aufbringen von Spinnvliesfäden auf die Bahnenmaterialkontaktseite des in einer Bandbewegungsrichtung sich bewegenden Gewebebandes in wenigstens einem, vorzugsweise einer Mehrzahl von in der Bandbewegungsrichtung aufeinander folgenden Spinnvliesfaden-Aufbringungsbereichen. Das Gewebeband umfasst dabei eine Mehrzahl von im Wesentlichen in einer Bandlängsrichtung verlaufenden Längsfäden und eine Mehrzahl von im Wesentlichen in einer Bandquerrichtung verlaufenden Querfäden, wobei die Längsfäden an Abbindepunkten mit den Querfäden abbinden und an einer Bahnenmaterialkontaktseite Scheitelbereiche der Längsfäden gebildet sind, wobei an der Bahnenmaterialkontaktseite eine Vielzahl von Ablagerungen wenigstens an den Längsfäden vorgesehen ist.According to the invention, this object is achieved by a method for producing spunbonded nonwoven webs comprising a webbing comprising applying spunbonded filaments to the web contact side of the webbing belt moving in a webmoving direction in at least one, preferably a plurality of spunbonded web landing regions following each other in the webmoving direction. The fabric tape comprises a plurality of longitudinal threads running essentially in a band longitudinal direction and a plurality of transverse threads extending substantially in a transverse direction of the band, wherein the longitudinal threads set at setting points with the transverse threads and apex areas of the longitudinal threads are formed on a web contact side, wherein on the web material contact side Variety of deposits is provided at least on the longitudinal threads.

Dabei ist weiter vorgesehen, dass nicht in Scheitelbereiche sich erstreckende Ablagerungen vorgesehen sind, oder/und dass in Scheitelbereiche sich erstreckende Ablagerungen bezüglich eines jeweiligen Scheitelbereichs in der Bandlängsrichtung unsymmetrisch sind.It is further provided that not in peak areas extending deposits are provided, and / or that in peak areas extending deposits are asymmetrical with respect to a respective apex area in the tape longitudinal direction.

Bei dem Gewebeband werden neue Kontakt- bzw. Tragepunkte für das Spinnvlies erzeugt. Durch die Ablagerungen entsteht eine verstärkte Mitnahmewechselwirkung mit dem herzustellenden Bahnenmaterial. Dazu sind insbesondere auch in Bereichen außerhalb der Scheitelbereiche bzw. die Scheitelbereiche nicht berührende Ablagerungen vorgesehen bzw. sind die in Scheitelbereichen sich hinein erstreckenden Ablagerungen bezüglich der Scheitelbereiche unsymmetrisch gestaltet. Durch die so ausgebildeten Ablagerungen kann eine vergrößerte Oberfläche des Gewebebands zur Mitnahmewechselwirkung mit dem zu fertigenden Bahnenmaterial erreicht werden.In the fabric band new contact or carrying points for the spunbond are produced. The deposits create an increased driving interaction with the web material to be produced. For this purpose, especially in areas outside the vertex areas or the deposits are not contiguous to the apex areas, or the deposits extending in vertex areas are asymmetrical with respect to the vertex areas. As a result of the deposits formed in this way, an enlarged surface of the fabric band for entrainment interaction with the web material to be produced can be achieved.

Es ist hier darauf hinzuweisen, dass die an dem Gewebeband vorgesehenen Ablagerungen im Sinne der vorliegenden Erfindungen durch gezielt auf die Fäden des Gewebebandes aufgebrachtes Material gebildet sind und nicht durch beispielsweise im Bahnenmaterialherstellungsbetrieb an der Fadenoberfläche anhaftende Materialien, insbesondere Verunreinigungen.It should be pointed out here that the deposits provided on the fabric tape in the sense of the present invention are formed by material applied specifically to the threads of the fabric tape and not by materials adhering to the thread surface, for example in the web material production operation, in particular contaminants.

Eine weitere Verstärkung der Mitnahmewechselwirkung durch Vergrößerung der zur Auflage von Bahnenmaterial vorgesehenen Oberfläche kann dadurch erreicht werden, dass wenigstens zwei nebeneinander liegende Längsfäden berührende Ablagerungen vorgesehen sind. Die Bereiche, in welchen bei dem erfindungsgemäß aufgebauten Gewebeband Ablagerungen vorhanden sind, sind also nicht nur auf einzelne Fäden beschränkt, sondern umfassen auch fädenübergreifende Oberflächenbereiche.A further reinforcement of the entrainment interaction by increasing the surface provided for the application of web material can be achieved by providing at least two adjacent longitudinal threads touching deposits. The areas in which deposits are present in the fabric tape constructed according to the invention are therefore not limited to individual threads, but also include cross-thread surface areas.

Es hat sich gezeigt, dass eine besonders vorteilhafte Mitnahmewechselwirkung für das zu fertigende Bahnenmaterial erreicht werden kann, wenn bei wenigstens einem Teil der bezüglich eines Scheitelbereichs unsymmetrischen Ablagerungen wenigstens 70 Vol.-%, vorzugsweise wenigstens 80 Vol.-% des Ablagerungsvolumens in der Bandlängsrichtung an einer Seite bezüglich eines Scheitelzentrums angeordnet sind.It has been found that a particularly advantageous entrainment interaction for the web material to be produced can be achieved if at least part of the asymmetrical deposits relative to a peak area has at least 70% by volume, preferably at least 80% by volume, of the deposition volume in the band longitudinal direction a side are arranged with respect to a vertex center.

Um einerseits eine sehr effiziente Mitnahmewechselwirkung durch Oberflächenvergrößerung zu erlangen, andererseits keine zu starke Beeinträchtigung der Oberflächenqualität des zu fertigenden Bahnenmaterials durch derartige Ablagerungen zu erhalten, kann bei dem Gewebeband vorgesehen sein, dass die Ablagerungen mit einer Flächendichte im Bereich von 5 bis 500, vorzugsweise etwa 50 bis 200, Ablagerungen/cm2, vorgesehen sind. Weiter ist es in diesem Zusammenhang vorteilhaft, wenn wenigstens 80 % der Ablagerungen eine Erstreckungslänge in der Bandlängsrichtung im Bereich von 250 bis 2500, vorzugsweise etwa 1000 bis 1500, µm aufweisen. Wenigstens 80 % der Ablagerungen können eine maximale Vorsprungshöhe über die diese tragenden Fäden im Bereich von 50 bis 500, vorzugsweise etwa 100 bis 250, µm aufweisen.On the one hand to achieve a very efficient driving interaction through surface enlargement, on the other hand, not too strong impairment of the surface quality of the web to be produced To obtain by such deposits, may be provided in the fabric tape that the deposits with an areal density in the range of 5 to 500, preferably about 50 to 200, deposits / cm 2 , are provided. Further, it is advantageous in this context if at least 80% of the deposits have an extension length in the band longitudinal direction in the range of 250 to 2500, preferably about 1000 to 1500, microns. At least 80% of the deposits may have a maximum protrusion height over the filaments supporting them in the range of 50 to 500, preferably about 100 to 250, microns.

Zum Aufbau der Gewebestruktur des Gewebebands kann vorgesehen sein, dass wenigstens ein Teil der, vorzugsweise alle, Längsfäden oder/und Querfäden mit Polyester (PET)-Material aufgebaut ist. Ein Teil der Querfäden kann zum Verhindern einer elektrostatischen Aufladung mit elektrisch leitendem Material aufgebaut sein. Hier sind vor allem so genannte Zweikomponentengarne vorteilhaft, welche einen beispielsweise mit PA-Material aufgebauten Kern und eine Umhüllung von PA-Material, welches so genannte Carbo-Nano-Tubes enthält, umfassen.In order to build up the fabric structure of the fabric tape, it may be provided that at least a part of, preferably all, longitudinal threads and / or transverse threads are constructed with polyester (PET) material. A part of the transverse threads may be constructed to prevent electrostatic charging with electrically conductive material. Here, especially so-called two-component yarns are advantageous, which comprise a constructed for example with PA material core and a sheath of PA material, which contains so-called carbon nanotubes.

Die Ablagerungen können zum Erhalt einer effizienten Mitnahmewechselwirkung mit Silikon-Material oder PU-Material aufgebaut sein.The deposits can be designed to obtain an efficient entrainment interaction with silicone material or PU material.

Die zur Fertigung von Spinnvlies eingesetzten Gewebebänder haben im Allgemeinen eine Gesamtlänge in Bandlängsrichtung die größer als ihre Breite, also die Erstreckungslänge in Bandquerrichtung, ist. Bei diesen sind insbesondere die Längsfäden Kettfäden und die Querfäden Schussfäden. Zur Bereitstellung einer Endloskonfiguration sind Spiralverbindungselemente oder eine Gewebenaht oder dergleichen denkbar.The fabric tapes used for the production of spunbonded fabric generally have a total length in the tape longitudinal direction which is greater than its width, that is to say the extension length in the tape transverse direction. In these, in particular the longitudinal threads are warp threads and the transverse threads are weft threads. To provide an endless configuration, spiral connecting elements or a woven fabric seam or the like are conceivable.

Im Spinnvliesherstellungsprozess kommt die bei dem Gewebeband vorgesehene verstärkte Mitnahmewechselwirkung besonders vorteilhaft zum Tragen, da die in einem oder mehreren Spinnvliesfaden-Aufbringungsbereichen aufgebrachten, im Allgemeinen sehr dünnen Spinnvliesfäden bzw. -filamente sehr leicht sind und im Fertigungsprozess grundsätzlich die Gefahr besteht, dass bei zu geringer Mitnahmewechselwirkung die allgemein auch vorhandenen Luftverwirbelungen ein Ablösen der auf die Bahnenmaterialkontaktseite eines derartigen Gewebebands aufgebrachten Spinnvliesfäden bewirken.In the spunbonding process, the increased entrainment interaction provided with the fabric tape is particularly advantageous Wear, as applied in one or more spunbond strand application areas, generally very thin spunbonded filaments or filaments are very light and in the manufacturing process in principle there is a risk that too low entrainment interaction, the generally existing air turbulence peeling the on the web contact side of a effect spunbonded threads applied to such fabric bands.

In dem erfindungsgemäßen Herstellungsverfahren kann weiter vorgesehen sein, dass wenigstens ein, vorzugsweise jeder Spinnvliesfaden-Aufbringungsbereich eine Vielzahl von in der Bandquerrichtung aufeinander folgenden Spinnvliesfaden-Extrusionsdüsen zur Abgabe von Spinnvliesfäden auf die Bahnenmaterialkontaktseite des Gewebebandes umfasst. Somit können in Bandquerrichtung in einer Mehrzahl von Bereichen, nämlich immer dort, wo eine Spinnvliesfaden-Extrusionsdüse vorgesehen ist und somit ein Spinnvliesfaden im Extrusionsprozess abgegeben wird, verteilt auf die Bahnenmaterialkontaktseite aufgebracht werden, um somit auch über die gesamte Breite des Gewebebands eine im Wesentlichen gleichmäßige Spinnvliesstruktur herstellen zu können.In the production method according to the invention, it can further be provided that at least one, preferably each spunbonded filament application region comprises a multiplicity of spunbonded nonwoven filament extrusion nozzles in the strip transverse direction for dispensing spunbonded filaments onto the web contact side of the fabric tape. Thus, in the strip transverse direction in a plurality of areas, namely wherever a spunbonded thread extrusion die is provided and thus a spunbonded thread is dispensed in the extrusion process, can be applied distributed on the web material contact side, thus also over the entire width of the webbing a substantially uniform Spunbond structure to produce.

Gemäß einem besonders vorteilhaften Aspekt der vorliegenden Erfindung wird vorgeschlagen, dass Spinnvliesfäden aufgebracht werden, die wenigstens an einer Fadenoberfläche mit PP-Material ausgebildet sind, und dass das Gewebeband mit einer Geschwindigkeit von wenigstens 600 m/min in der Bandbewegungsrichtung bewegt wird und in einem stromaufwärtigen, ersten Spinnvliesfaden-Aufbringungsbereich Spinnvliesfäden mit einem Flächengewicht von höchstens, vorzugsweise weniger als, 4 g/m2 auf die Bahnenmaterialkontaktseite des Gewebebandes aufgebracht werden. Durch die mit dem erfindungsgemäß vorgesehenen Gewebeband erreichbare Mitnahmewechselwirkung besteht die Möglichkeit, mit einer vergleichsweisen hohen Fertigungsgeschwindigkeit von 600 m/min oder mehr zu arbeiten, gleichzeitig jedoch eine vergleichsweise geringe Menge von Spinnvliesfäden insbesondere im stromaufwärtigen, ersten Spinnvliesfaden-Aufbringungsbereich vorzusehen. Dieser Bereich ist besonders kritisch, da das Flächengewicht des herzustellenden Spinnvlieses erst in nachfolgenden, also weiter stromabwärtig im Fertigungsprozess liegenden Spinnvliesfaden-Aufbringungsbereichen zunimmt und somit die Gefahr des Ablösens des so hergestellten Spinnvlieses entsprechend abnimmt. Die im ersten Spinnvliesfaden-Aufbringungsbereich auf das Gewebeband bzw. dessen Bahnenmaterialkontaktseite aufgebrachten Spinnvliesfäden werden durch die erfindungsgemäß vorzusehenden Ablagerungen in der Bandbewegungsrichtung mitgenommen, ohne dass eine substantielle Gefahr des Ablösens besteht.According to a particularly advantageous aspect of the present invention, it is proposed that spunbonded filaments are formed which are formed on at least one thread surface with PP material, and that the fabric tape is moved at a speed of at least 600 m / min in the tape moving direction and in an upstream one , spunbonded nonwoven filament application region spunbonded filaments having a basis weight of at most, preferably less than, 4 g / m 2 are applied to the web material contact side of the fabric tape. The driving interaction achievable with the fabric tape provided according to the invention makes it possible to work with a comparatively high production speed of 600 m / min or more, but at the same time a comparatively small amount of spunbonded filaments, in particular in the upstream, first spunbonded filament application region. This area is particularly critical since the weight per unit area of the spunbonded fabric increases only in subsequent spunbonded filament application areas, ie further downstream in the production process, and thus correspondingly decreases the risk of detachment of the spunbonded fabric produced in this way. The spunbonded filaments applied to the fabric tape or its web contact side in the first spunbonded filament application region are entrained in the tape movement direction by the deposits to be provided according to the invention, without any substantial risk of detachment.

Weiter kann bei dem erfindungsgemäßen Verfahren vorgesehen sein, dass Spinnvliesfäden aufgebracht werden, die wenigstens an einer Fadenoberfläche mit PE-Material ausgebildet sind, und dass das Gewebeband mit einer Geschwindigkeit von wenigstens 300 m/min in der Bandbewegungsrichtung bewegt wird und in einem stromaufwärtigen, ersten Spinnvliesfaden-Aufbringungsbereich Spinnvliesfäden mit einem Flächengewicht von höchstens, vorzugsweise weniger als, 8 g/m2 auf die Bahnenmaterialkontaktseite des Gewebebandes aufgebracht werden. Auch bei der Herstellung von derartigem Spinnvlies, das an seiner Oberfläche mit PE-Material aufgebaut ist, kann durch das erfindungsgemäße Aufbringen von Ablagerungen auf ein Gewebeband mit vergleichsweise hoher Geschwindigkeit und vergleichsweise geringem Flächengewicht der im ersten Spinnvliesfaden-Aufbringungsbereich aufzubringenden Spinnvliesfäden bzw. der so hergestellten Lage von Spinnvliesfäden gearbeitet werden.Furthermore, it can be provided in the inventive method that spunbonded filaments are applied, which are formed at least on a thread surface with PE material, and that the fabric tape is moved at a speed of at least 300 m / min in the tape movement direction and in an upstream, first Spunbonded filament application area Spunbonded filaments having a weight per unit area of at most, preferably less than, 8 g / m 2 are applied to the web material contact side of the fabric band. Also in the production of such spunbonded fabric, which is constructed on its surface with PE material, can be applied by the inventive application of deposits on a fabric tape with comparatively high speed and comparatively low basis weight of the spunbonded yarn application area to be applied spunbonded filaments or the thus produced Able to be worked by spunbonded threads.

Die vorliegende Erfindung wird nachfolgend mit Bezug auf die beiliegenden Figuren detailliert beschrieben. Es zeigt:

Fig. 1
eine Draufsicht auf einen Teilbereich eines Gewebebands mit Längsfäden und Querfäden und darauf vorgesehenen Ablagerungen;
Fig. 2
eine vereinfachte Längsschnittdarstellung eines Gewebebandes;
Fig. 3
eine weitere vereinfachte Längsschnittdarstellung eines Gewebebandes.
The present invention will be described below in detail with reference to the accompanying drawings. It shows:
Fig. 1
a plan view of a portion of a fabric belt with longitudinal threads and transverse threads and deposits provided thereon;
Fig. 2
a simplified longitudinal section of a fabric tape;
Fig. 3
another simplified longitudinal sectional view of a fabric tape.

In Fig. 1 ist ein Ausschnitt eines allgemein mit 10 bezeichneten Gewebebandes gezeigt, welches in einer Endloskonfiguration bei der Herstellung von Spinnvlies eingesetzt werden kann. Das Gewebeband 10 umfasst eine Vielzahl von nebeneinander in einer Bandlängsrichtung L verlaufenden Längsfäden 12 sowie eine Vielzahl von in einer Bandquerrichtung Q nebeneinander verlaufenden Querfäden 14. Da das Gewebeband 10 im Allgemeinen durch einen Nahtbereich, Spiralverbindungselemente oder dergleichen als Endlosband bereitgestellt wird, ist es vorteilhaft, wenn die Längsfäden 12 durch Kettfäden und die Querfäden 14 durch Schussfäden bereitgestellt sind. Im Spinnvliesherstellungsprozess bewegt sich das Gewebeband 10 in Richtung der Längsfäden 12, also in der Längsrichtung L, welche dann auch der Bandbewegungsrichtung, im Allgemeinen also einer Maschinenrichtung, entspricht, während die Querrichtung Q einer Maschinenquerrichtung entspricht.In Fig. 1 FIG. 3 shows a section of a fabric tape, generally designated 10, which can be used in an endless configuration in the manufacture of spunbonded fabric. The fabric tape 10 comprises a multiplicity of longitudinal threads 12 running side by side in a tape longitudinal direction L and a multiplicity of transverse threads 14 running side by side in a tape transverse direction Q. Since the fabric tape 10 is generally provided by a seam region, spiral fasteners or the like as an endless belt, it is advantageous to when the longitudinal threads 12 are provided by warp threads and the transverse threads 14 by weft threads. In the spunbonding process, the fabric belt 10 moves in the direction of the longitudinal yarns 12, ie in the longitudinal direction L, which then also corresponds to the tape movement direction, generally a machine direction, while the transverse direction Q corresponds to a cross-machine direction.

In Fig. 1 ist ein Ausschnitt einer allgemein mit 16 bezeichneten Bahnenmaterialkontaktseite des Gewebebands 10 gezeigt. Auf diese Bahnenmaterialkontaktseite 16 werden im Spinnvliesfertigungsprozess die in einzelnen Spinnvliesfaden-Aufbringungsbereichen aus Spinnvliesfaden-Extrusionsdüsen abgegebenen Spinnvliesfäden aufgetragen. Dabei sind vorteilhafterweise in der Bandbewegungsrichtung, also der Längsrichtung L aufeinanderfolgend mehrere z. B. balkenartig ausgebildete Spinnvliesfaden-Aufbringungsbereiche vorgesehen, welche jeweils eine Mehrzahl von in der Bandquerrichtung Q aufeinander folgenden Spinnvliesfaden-Extrusionsdüsen umfassen. In jedem der Spinnvliesfaden-Aufbringungsbereiche wird eine Lage von Spinnvliesfäden, auch als Spinnvliesfilamente bezeichnet, aufgetragen, so dass am Ende dieses Aufbringungsprozesses ein Spinnvlies mit einer Mehrzahl von übereinander aufgebrachten Lagen von Spinnvliesfäden erzeugt ist. Das so hergestellte Spinnvlies kann von dem Gewebeband 10 abgehoben werden und beispielsweise in einem Kalandriervorgang durch Pressen verfestigt werden.In Fig. 1 For example, a portion of a web contact side of webbing 10, generally designated 16, is shown. In this spunbond contact side 16, the spunbonded filaments dispensed from spunbonded filament extrusion nozzles in individual spunbonded filament application regions are applied in the spunbond production process. Here are advantageously in the tape movement direction, ie the longitudinal direction L consecutively z. B. bar-like formed spunbonded yarn application areas, each having a plurality of in the Tape transverse direction Q consecutive spunbonded yarn extrusion nozzles include. In each of the spunbonded yarn application regions, a layer of spunbonded filaments, also referred to as spunbond filaments, is applied, so that at the end of this application process a spunbonded web is produced with a plurality of layers of spunbonded filaments laid one on top of the other. The spunbonded fabric produced in this way can be lifted off the fabric band 10 and, for example, consolidated by pressing in a calendering process.

Wie in Fig. 2 veranschaulicht, sind in dem Gewebeband 10 dort, wo die Längsfäden 12 und die Querfäden 14 sich kreuzen, so genannte Abbindepunkte 18 gebildet. Dabei binden beispielsweise die beiden in Fig. 2 erkennbaren Längsfäden 12 über den auch dargestellten Querfäden 14, also an der in Fig. 2 oben liegenden Bahnenmaterialkontaktseite 16 bezüglich der Querfäden 14 ab. In diesen Abbindepunkten sind die Längsfäden 12 gekrümmt bzw. gekröpft, so dass Scheitelbereiche 20 entstehen. Im Sinne der vorliegenden Erfindung erstreckt sich ein derartiger Scheitelbereich der Längsfäden 12 in der Längsrichtung L über eine Strecke, welche der Abmessung der in diesen Scheitelbereichen 20 unter den Längsfäden 12 liegenden Querfäden 14 in der Längsrichtung L entspricht. Im dargestellten Beispiel von Querfäden 14 mit im Wesentlichen kreisrundem Querschnitt entspricht diese Erstreckungslänge der Scheitelbereiche 20 im Wesentlichen dem Durchmesser D der Querfäden 14.As in Fig. 2 In the fabric tape 10, where the longitudinal yarns 12 and the transverse yarns 14 intersect, so-called bonding points 18 are formed. For example, the two bind in Fig. 2 recognizable longitudinal threads 12 on the cross threads 14, also shown on the in Fig. 2 above sheet material contact side 16 with respect to the transverse threads 14 from. In these bonding points, the longitudinal threads 12 are curved or cranked, so that peak areas 20 arise. For the purposes of the present invention, such an apex region of the longitudinal threads 12 extends in the longitudinal direction L over a distance which corresponds to the dimension of the transverse threads 14 located in the longitudinal regions 12 in these apex regions 20 in the longitudinal direction L. In the illustrated example of transverse threads 14 with a substantially circular cross-section, this extension length of the apex regions 20 essentially corresponds to the diameter D of the transverse threads 14.

An der Bahnenmaterialkontaktseite 16 des Gewebebandes 10 sind vorzugsweise aus Silikon-Material aufgebaute Ablagerungen 22 vorgesehen. Diese vorteilhafterweise in einem Polymer-Extrusions-Ablagerungsprozess, also im Wesentlichen nach Art eines Siebdruckvorgangs mit einer Siebwalze oder eines Nozzle-Printing-Vorgangs aufgebrachten Ablagerungen 22 haften auf der Oberfläche insbesondere der Längsfäden 12, teilweise auch der Querfäden 14 an und führen allgemein zu einer verstärkten Mitnahmewirkung für die auf die Bahnmaterialkontaktseite 16 aufgebrachten Spinnvliesfäden.At the web contact side 16 of the fabric tape 10 are preferably constructed of silicone material deposits 22 are provided. These deposits 22, which are advantageously applied in a polymer extrusion deposition process, that is essentially in the manner of a screen printing operation with a screen roller or a nozzle printing process, adhere to the surface, in particular of the longitudinal threads 12, partially also of the transverse threads 14, and generally lead to one increased entrainment effect for the spunbonded filaments applied to the web material contact side 16.

Da in dem Aufbringungsvorgang der Ablagerungen 22 im Allgemeinen das Gewebeband 10 sich in der Längsrichtung L bewegt, werden die Ablagerungen 22 eine im Wesentlichen in dieser Fertigungsrichtung, also der Längsrichtung L, langgestreckte Kontur aufweisen. Die Ablagerungen 22 sind bei dem Gewebeband 10 nicht nur in Scheitelbereichen 20 vorhanden, sondern sind insbesondere auf den Längsfäden 12 auch zwischen Scheitelbereichen 22 vorgesehen, und zwar derart, dass zumindest ein Teil der zwischen Scheitelbereichen 20 vorgesehenen Ablagerungen 22 sich nicht in Scheitelbereiche hinein erstreckt, wie dies in Fig. 2 beispielsweise bei der Ablagerung 221 der Fall ist. Auch die Ablagerung 222 erstreckt sich nicht in einen Scheitelbereich 20 hinein. Erkennbar ist, dass diese Ablagerung 222 in Kontakt mit zwei Längsfäden 12 ist. Die in Fig. 2 erkennbare Ablagerung 223 erstreckt sich auch in einen Scheitelbereich 20 hinein und ist bezüglich dessen Scheitelzentrum Z in der Bandlängsrichtung unsymmetrisch. Es sei darauf hingewiesen, dass das Scheitelzentrum Z die Längenmitte eines jeweiligen Scheitelbereichs 20 in der Längsrichtung L ist. Die bzw. ein Teil der Ablagerungen 22 weisen die in Fig. 2 anhand der Ablagerung 223 erkennbare Struktur auf, bei welcher eine starke Unsymmetrie bezüglich des Scheitelzentrums Z vorhanden ist. Wenigstens 70 %, vorzugsweise wenigstens 80 % des Volumens dieser Ablagerung 223 liegen an einer Seite in Bahnlängsrichtung bezüglich des Scheitelzentrums Z. Diese Formgebung mit durch die starke Unsymmetrie gebildeten, nasenartigen Vorsprungs- bzw. Endbereichen 24 derartiger Ablagerungen 223 kann durch den vorangehenden Ablagerungsprozess mit Fertigungsrichtung in Längsrichtung L erreicht werden.Since, in the deposition process of the deposits 22, the fabric tape 10 generally moves in the longitudinal direction L, the deposits 22 will have an elongated contour substantially in this direction of manufacture, that is, the longitudinal direction L. The deposits 22 are not only present in the fabric band 10 in apex regions 20, but are provided in particular on the longitudinal yarns 12 between vertex regions 22 in such a way that at least a portion of the deposits 22 provided between crest regions 20 does not extend into vertex regions. like this in Fig. 2 For example, in the deposition 22 1 is the case. The deposit 22 2 does not extend into a vertex area 20. It can be seen that this deposit 22 2 is in contact with two longitudinal threads 12. In the Fig. 2 Identifiable deposit 22 3 also extends into an apex region 20 and is asymmetrical with respect to its vertex center Z in the band longitudinal direction. It should be noted that the vertex Z is the length center of each vertex portion 20 in the longitudinal direction L. The or a part of the deposits 22 have the in Fig. 2 on the basis of the deposit 22 3 recognizable structure in which a strong asymmetry with respect to the apex Z is present. At least 70%, preferably at least 80%, of the volume of this deposit 22 3 lies on one side in the web longitudinal direction with respect to the apex center Z. This shaping with the nonselective protrusion or end regions 24 of such deposits 22 3 formed by the strong asymmetry can be achieved by the preceding deposition process be achieved with the production direction in the longitudinal direction L.

Die Ablagerungen 22 sind bei dem Gewebeband 10 vorzugsweise verteilt über die gesamte Bahnenmaterialkontaktseite 16 mit einer Flächendichte im Bereich von 5 bis 500, vorzugsweise etwa 50 bis 200, Ablagerungen/cm2 vorgesehen. Wie vorangehend bereits angesprochen, können durch den Ablagerungsprozess die Ablagerungen mit einer in der Bandlängsrichtung L langgestreckten Kontur bereitgestellt werden, wobei vorteilhafterweise wenigstens 80 % dieser Ablagerungen 22 in der Bandlängsrichtung eine Erstreckungslänge im Bereich von 250 bis 2500, vorzugsweise etwa 1000 bis 1500, µm aufweisen. Um die angestrebte Mitnahmewirkung für die auf dem Gewebeband 10 abzulagernden Spinnvliesfäden erreichen zu können, ist es weiter vorteilhaft, wenn wenigstens 80 % der Ablagerungen 22 eine maximale Vorsprungshöhe H über die diese tragenden Fäden, hier beispielsweise Längsfäden 12, im Bereich von 50 bis 500, vorzugsweise etwa 100 bis 250, µm aufweisen.The deposits 22 are provided in the fabric band 10 preferably distributed over the entire web material contact side 16 with an areal density in the range of 5 to 500, preferably about 50 to 200, deposits / cm 2 . As already mentioned above, by the deposition process, the deposits with a in the tape longitudinal direction L elongated contour are provided, wherein advantageously at least 80% of these deposits 22 in the tape longitudinal direction have an extension length in the range of 250 to 2500, preferably about 1000 to 1500, microns. In order to be able to achieve the desired entrainment effect for the spunbonded filaments to be deposited on the fabric band 10, it is further advantageous if at least 80% of the deposits 22 have a maximum projection height H over the filaments supporting them, here for example longitudinal filaments 12, in the range from 50 to 500, preferably about 100 to 250 microns.

Durch das Bereitstellen der Ablagerungen 22 an der Bahnmaterialkontaktseite 16 des Gewebebandes 10 wird einerseits die Gesamtoberfläche, welche in Wechselwirkung mit den mitzunehmenden Spinnvliesfäden treten kann, vergrößert. Andererseits bzw. bedingt durch diese Flächenzunahme wird die Oberflächenrauigkeit des Gewebebandes 10 an der Bahnenmaterialkontaktseite 16 erhöht, so dass beispielsweise ausgehend von einem Rauigkeitswert Ra von 250 bis 300 µm nach Beschichtung bzw. Aufbringung der Ablagerungen die Rauigkeit Ra bei etwa 290 bis 350 µm liegen kann.By providing the deposits 22 on the web material contact side 16 of the fabric tape 10, on the one hand, the total surface, which can interact with the spunbonded nonwoven filaments to be entrained, is increased. On the other hand, or due to this increase in area, the surface roughness of the fabric tape 10 is increased at the web contact side 16, so that, for example, starting from a roughness Ra of 250 to 300 microns after coating or deposition of the deposits roughness Ra may be about 290 to 350 microns ,

Durch das Bereitstellen einer verstärkten Mitnahmewechselwirkung für die auf das Gewebeband 10 aufgebrachten Spinnvliesfäden ist die Möglichkeit geschaffen, im Spinnvliesfertigungsprozess mit vergleichsweise hoher Geschwindigkeit des Gewebebands 10 in der Bandbewegungsrichtung, im Allgemeinen also der Bandlängsrichtung L, zu arbeiten, dabei aber auch vergleichsweise dünne Lagen von Spinnvliesfäden in den verschiedenen Spinnvliesfaden-Aufbringungsbereichen aufzubringen, um somit auch ein Spinnvlies mit vergleichsweise filigraner Struktur herstellen zu können. Wird beispielsweise ein Spinnvlies hergestellt, dessen Spinnvliesfäden an ihrer Fadenoberfläche mit PP-Material aufgebaut sind, so kann mit dem erfindungsgemäß mit Ablagerungen versehenen Gewebeband mit einer Geschwindigkeit von wenigstens 600 m/min gearbeitet werden, wobei in einem stromaufwärtigen, ersten Spinnvliesfaden-Aufbringungsbereich Spinnvliesfäden mit einem gesamten Flächengewicht von weniger als 4 g/m2 auf die Bahnmaterialkontaktseite 16 des Gewebebandes 10 aufgebracht werden können. In bezüglich der Bandbewegungsrichtung weiter stromabwärtigen Spinnvliesfaden-Aufbringungsbereichen können dann weitere Lagen von Spinnvliesfäden, beispielsweise mit vergleichbarem geringem Flächengewicht aufgebracht werden, so dass insgesamt ein Spinnvlies mit geringer Dicke und sehr feiner Struktur hergestellt werden kann. Selbstverständlich können unter Einsatz des Gewebebandes 10 auch Spinnvliese mit größerem Flächengewicht, insbesondere auch größerem Flächengewicht der in einzelnen Spinnvliesfaden-Aufbringungsbereichen aufzubringenden Spinnvlieslagen erzeugt werden.By providing an enhanced driving interaction for the spunbonded filaments applied to the fabric tape 10, the possibility is created to work in the spunbond production process with comparatively high speed of the fabric tape 10 in the tape movement direction, generally the tape longitudinal direction L, but also comparatively thin layers of spunbonded filaments applied in the various spunbonded yarn application areas, so as to be able to produce a spunbonded fabric with a comparatively filigree structure. If, for example, a spunbonded fabric is produced whose spunbonded filaments are constructed on their thread surface with PP material, then the fabric tape provided according to the invention can be worked at a speed of at least 600 m / min, wherein spunbonded filaments having a total basis weight of less than 4 g / m 2 can be applied to the web material contact side 16 of the fabric tape 10. In relation to the tape movement direction further downstream spunbonded yarn application areas then further layers of spunbonded filaments, for example, be applied with a comparable low basis weight, so that a total of a spunbonded fabric with a small thickness and very fine structure can be produced. Of course, using the fabric tape 10, it is also possible to produce spunbonded nonwovens having a larger basis weight, in particular also a larger basis weight, of the spunbonded nonwoven layers to be applied in individual spunbonded yarn application areas.

Soll ein Spinnvlies hergestellt werden, dessen Spinnvliesfäden zumindest an ihrer Fadenoberfläche mit PE-Material aufgebaut sind, welches bezüglich der im Allgemeinen auch aus Polymermaterial aufgebauten Fäden des Gewebebandes 10 einen geringeren Haftreibungskoeffizienten aufweist, kann mit dem vorangehend beschriebenen Gewebeband 10 gleichwohl mit vergleichsweise hoher Fertigungsgeschwindigkeit von wenigstens 300 m/min gearbeitet werden, wobei gleichzeitig auch insbesondere im stromaufwärtigen, ersten Spinnvliesfaden-Aufbringungsbereich Spinnvliesfäden mit einem Flächengewicht von weniger als 8 g/m2 aufgebracht werden können, ohne dass die Gefahr des Abhebens bzw. Loslösens dieser ersten Lage von Spinnvliesfäden, bedingt durch die im Fertigungsprozess entstehenden Turbulenzen, besteht. Während Spinnvliesfäden, die an ihrer Fadenoberfläche mit PP-Material aufgebaut sind, im Allgemeinen in ihrem gesamten Volumenbereich aus PP-Material bestehen, können Spinnvliesfäden, die an ihrer Fadenoberfläche mit PE-Material aufgebaut sind, entweder vollständig, also im gesamten Volumenbereich, aus PE-Material bestehen, oder können als so genannte Mantel-Kern-Fäden bzw. Filamente ausgebildet sein, die beispielsweise einen Kern aus PP-Material und einen diesen umhüllenden Mantel aus PE-Material umfassen können. Derartige Fäden bzw. Filamente werden auch als Zweikomponentenfäden bezeichnet.If a spunbonded nonwoven web is to be produced whose spunbonded fibers are constructed with PE material at least on its thread surface, which has a lower static friction coefficient with respect to the threads of the fabric strip 10 which are generally constructed of polymer material, the fabric strip 10 described above can nevertheless be manufactured with a comparatively high production rate of At least 300 m / min are worked, at the same time in particular in the upstream, first spunbond strand application area spunbonded filaments with a basis weight of less than 8 g / m 2 can be applied without the risk of lifting or detachment of this first layer of spunbonded filaments, due to the turbulence arising in the manufacturing process, exists. While spunbonded filaments, which are constructed on their thread surface with PP material, generally in their entire volume range of PP material, spunbonded filaments, which are constructed on their thread surface with PE material, either completely, ie in the entire volume range, made of PE -Material consist, or may be formed as a so-called sheath-core threads or filaments, for example, a core of PP material and a sheath surrounding this PE material may include. Such threads or filaments are also referred to as two-component threads.

Mit dem vorangehend beschriebenen Gewebeband besteht die Möglichkeit, im Spinnvliesherstellungsprozess durch die verstärkte Mitnahmewechselwirkung insbesondere der im am weitesten stromaufwärts gelegenen, ersten Spinnvliesfaden-Aufbringungsbereichs gebildeten Spinnflieslage mit vergleichsweise hoher Fertigungsgeschwindigkeit zu arbeiten, auch wenn nur Spinnvlieslagen mit geringem Flächengewicht aufgebracht werden. Dazu sind vorteilhafterweise die diese verstärkte Mitnahmewechselwirkung generierenden Ablagerungen aus Silikon-Material oder PU-Material aufgebaut. Die Längsfäden bzw. wenigstens ein Teil der Längsfäden können z. B. als PET-Monofilamente bereitgestellt werden, also Fäden, welche über ihren gesamten Querschnitt mit dem gleichen Material aufgebaut sind. Entsprechendes gilt auch für die Querfäden. Ein Teil der Querfäden kann zum Vermeiden elektrostatischer Aufladungen mit elektrisch leitendem Material aufgebaut werden. Hier kann beispielsweise eine Mantel-Kern-Struktur vorgesehen sein, bei welcher ein Kern aus PA-Material von einem Mantel aus so genannten Carbon-Nano-Tubes enthaltendem PA-Material umgeben ist.With the fabric tape described above, it is possible to work in the spunbonding process by the increased entrainment interaction of the most upstream, first spunbond thread application region with a relatively high production rate, even if only low basis weight spunbond layers are applied. For this purpose, the deposits generated from silicone material or PU material which generate this enhanced entrainment interaction are advantageously constructed. The longitudinal threads or at least a portion of the longitudinal threads may, for. B. are provided as PET monofilaments, ie threads which are constructed over their entire cross section with the same material. The same applies to the transverse threads. Part of the transverse threads can be constructed to avoid electrostatic charges with electrically conductive material. Here, for example, a sheath-core structure may be provided in which a core of PA material is surrounded by a sheath of so-called carbon nanotubes containing PA material.

Bei dem Gewebeband können selbstverständlich Längsfäden sowie auch Querfäden verschiedener Art miteinander kombiniert werden. Insbesondere ist es auch möglich, Querfäden zu integrieren, welche elektrisch leitend sind, um in dem im Allgemeinen trocken ablaufenden Spinnvliesfertigungsprozess die Entstehung elektrostatischer Aufladungen zu vermeiden.Of course, longitudinal threads as well as transverse threads of different types can be combined with each other in the fabric band. In particular, it is also possible to integrate transverse threads, which are electrically conductive, in order to avoid the formation of electrostatic charges in the generally dry-running spunbonding production process.

Claims (11)

  1. Method for producing spunbonded fabric using a woven-fabric belt (10), comprising the application of spunbonded threads onto the web-material contacting side (16) of the woven-fabric belt (10), moving in a belt-movement direction, in at least one, preferably in a plurality of, spunbonded-thread application regions which are sequential in the belt-movement direction,
    characterized
    in that the woven-fabric belt (10) comprises a plurality of longitudinal threads (12), running substantially in a longitudinal belt direction (L), and a plurality of transverse threads (14), running substantially in a transverse belt direction (Q), wherein the longitudinal threads (12) bind with the transverse threads (14) at binder points (18), and crown regions (20) of the longitudinal threads (12) are formed on a web-material contacting side (16), wherein on the web-material contacting side (16) a multiplicity of deposits (22) are provided at least on the longitudinal threads (12),
    wherein deposits (221) which do not extend into the crown regions (20) are provided,
    and/or
    wherein deposits (223) which do extend into crown regions (20) in the longitudinal belt direction (L) are asymmetrical in relation to a respective crown region (20).
  2. Method according to Claim 1, characterized in that deposits (222) that contact at least two longitudinal threads (12) that lie next to one another are provided.
  3. Method according to Claim 1 or 2, characterized in that in the case of at least part of the deposits (223) that are asymmetrical in relation to a crown region (20), at least 70% by volume, preferably at least 80% by volume of the deposit volume in the longitudinal belt direction (L) is disposed on one side in relation to a crown center (Z).
  4. Method according to one of Claims 1 to 3, characterized in that the deposits (22) are provided with an area density in the range from 5 to 500, preferably approximately 50 to 200 deposits/cm2.
  5. Method according to one of Claims 1 to 4, characterized in that at least 80% of the deposits (22) have a length of extent in the longitudinal belt direction (L) in the range from 250 to 2500, preferably approximately 1000 to 1500, µm.
  6. Method according to one of Claims 1 to 5, characterized in that at least 80% of the deposits (22) have a maximum protrusion height (H) beyond the supporting threads (12) thereof in the range from 50 to 500, preferably approximately 100 to 250, µm.
  7. Method according to one of Claims 1 to 6, characterized in that at least part, preferably all, of the longitudinal threads (12) and/or transverse threads (14) are constructed using PET material,
    and/or
    that at least part of the deposits (22) are constructed using silicone material or PU material.
  8. Method according to one of Claims 1 to 7, characterized in that the longitudinal threads (12) are warp threads, and the transverse threads (14) are weft threads.
  9. Method according to one of Claims 1 to 8, characterized in that at least one, preferably each spunbonded-thread application region comprises a multiplicity of spunbonded-thread extrusion nozzles, sequential in the transverse belt direction (Q), for dispensing spunbonded threads onto the web-material contacting side (16) of the woven-fabric belt (10).
  10. Method according to one of Claims 1 to 9, characterized in that spunbonded threads that are configured with PP material on at least one thread surface are applied, and that the woven-fabric belt (10) is moved at a speed of at least 600 m/min in the belt-movement direction, and in an upstream first spunbonded-thread application region spunbonded threads having an area weight of at most, preferably less than, 4 g/m2 are applied onto the web-material contacting side (16) of the woven-fabric belt (10).
  11. Method according to one of Claims 1 to 9, characterized in that spunbonded threads that are configured with PE material on at least one thread surface are applied, and that the woven-fabric belt (10) is moved at a speed of at least 300 m/min in the belt-movement direction, and in an upstream first spunbonded-thread application region spunbonded threads having an area weight of at most, preferably less than, 8 g/m2 are applied onto the web-material contacting side (16) of the woven-fabric belt (10).
EP15745444.8A 2014-08-07 2015-07-29 Method for producing spunbonded fabric Revoked EP3177459B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014215656 2014-08-07
PCT/EP2015/067349 WO2016020230A1 (en) 2014-08-07 2015-07-29 Fabric belt for producing web material, in particular for producing spunbonded fabric

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EP3177459A1 EP3177459A1 (en) 2017-06-14
EP3177459B1 true EP3177459B1 (en) 2019-08-21

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EP (1) EP3177459B1 (en)
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CA3195273A1 (en) * 2020-10-23 2022-04-28 Nippon Filcon Co., Ltd. Textile for non-woven fabric and conveying belt

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US10435828B2 (en) 2019-10-08
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EP3177459A1 (en) 2017-06-14
WO2016020230A1 (en) 2016-02-11

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