EP3250739B1 - Fabric tape for producing web material, in particular for producing spunbonded fabric - Google Patents

Fabric tape for producing web material, in particular for producing spunbonded fabric Download PDF

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Publication number
EP3250739B1
EP3250739B1 EP16701649.2A EP16701649A EP3250739B1 EP 3250739 B1 EP3250739 B1 EP 3250739B1 EP 16701649 A EP16701649 A EP 16701649A EP 3250739 B1 EP3250739 B1 EP 3250739B1
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EP
European Patent Office
Prior art keywords
polymer material
threads
woven
phase
longitudinal
Prior art date
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Active
Application number
EP16701649.2A
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German (de)
French (fr)
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EP3250739A1 (en
Inventor
Uwe Köckritz
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Voith Patent GmbH
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Voith Patent GmbH
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Publication date
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Publication of EP3250739A1 publication Critical patent/EP3250739A1/en
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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00—Woven fabrics designed to make specified articles
    • D03D1/0094—Belts
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/40—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
    • D03D15/47—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads multicomponent, e.g. blended yarns or threads
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
    • D03D15/533—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads antistatic; electrically conductive
    • 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
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/16—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard
    • D21J1/08—Impregnated or coated fibreboard
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2101/00—Inorganic fibres
    • D10B2101/10—Inorganic fibres based on non-oxides other than metals
    • D10B2101/12—Carbon; Pitch
    • D10B2101/122—Nanocarbons

Definitions

  • the present invention relates to a tape for the production of sheet material, such as. B. Spunbond.
  • a tape according to the preamble of claim 1 is from the US 5 746 887 A known.
  • Such fabric belts often have very high differences in height between the parts of the web material contact side provided by cranking the longitudinal threads and by cranking the transverse threads, especially for use as forming and transport belts of spunbonded nonwoven webs.
  • Experience with such fabric tapes shows that the spunbonded nonwoven webs formed on them and then transported, which generally have very low basis weights per layer of less than 20 grams / m 2 , with the machine speeds of up to 1100 meters per minute often used in such processes For example, cannot be transported reliably due to air turbulence. If the vacuum level is raised to stabilize the transport of the spin nonwoven webs, these spunbond nonwoven webs are often drawn into the weave structure, as a result of which it is often difficult to remove them from the fabric belts again in a subsequent transfer process.
  • the fabric tape on which, when used as intended, in a machine for producing spunbonded webs, such spunbonded webs are formed and transported, comprises a plurality of longitudinal threads running essentially in a longitudinal direction of the tape and a plurality of them Cross threads running essentially in a tape transverse direction and binding with the longitudinal threads, the longitudinal threads and the transverse threads being essentially composed of a polymer material and a part of the longitudinal threads and / or the transverse threads comprising electrically conductive material, longitudinal threads having convex longitudinal thread offsets on the web material contact side Form respective apex and the transverse threads comprise first transverse threads and the first transverse threads form convex first transverse thread offsets with respective apex on the web material contact side.
  • the height difference between the apexes of at least some, in particular the convex, longitudinal thread offsets and the apexes of at least some, in particular the first, convex transverse thread offsets on the web material contact side is less than 220 ⁇ m, preferably less than 180 ⁇ m, particularly preferably less than 150 ⁇ m .
  • the polymer material of the first transverse threads is built up with a two-phase polymer material, a first polymer material phase of the two-phase polymer material having a higher melting temperature than a second polymer material phase of the two-phase polymer material, and wherein the longitudinal threads with a polymer material, in particular with a Single-phase polymer material are constructed and the polymer material of the longitudinal threads has a melting temperature which is above the melting temperature of the second polymer material phase.
  • the spunbonded nonwoven threads Due to the fact that the height difference between the vertices of convex longitudinal thread offsets and first transverse thread offsets running on the web material contact side is less than 220 ⁇ m, preferably less than 180 ⁇ m, particularly preferably less than 150 ⁇ m, the spunbonded nonwoven threads have a very uniform level of support when they are deposited on the web material contact side and therefore do not dive as deep into the fabric structure as is the case with the fabric tapes known from the prior art. This means that the spunbonded nonwoven web formed from the spunbonded nonwoven threads has a high contact area with less immersion of the spunbonded nonwoven threads in the fabric structure. As a result, better adherence of the spunbonded nonwoven web to the fabric band is achieved without the spunbonded nonwoven web being drawn into the interior of the fabric band.
  • this fabric structure ensures that dirt, for example in the form of polymer drops, which can fall onto the fabric tape from the spinning thread extrusion nozzles, does not fall so deep into the fabric structure.
  • the fabric tapes of the invention do not become so dirty and are easier to clean.
  • the difference in height between the apexes of the convex longitudinal thread offsets and those of the first transverse thread offsets is determined in a cutting plane running perpendicular to the web material contact side.
  • the X-ray micro-computed tomography method also called micro-CT method, can be used as the measurement method.
  • the solution according to the invention can be realized, for example, by providing that the polymer material of the longitudinal threads and the polymer material of the first transverse threads is selected in such a way and the fabric tape is so heat-set that the first cross-threads were deformed more than their state before the heat-setting than the longitudinal threads were deformed in relation to their condition before the heat setting.
  • the longitudinal threads were subjected to tensile stress, while the longitudinal and transverse threads were subjected to a temperature of at least 150 ° C., preferably in the range from 180 to 200 ° C.
  • a fabric band for producing web material in particular for use in a machine for producing spunbonded nonwoven webs, comprising a plurality of longitudinal threads running essentially in a longitudinal direction of the band and a plurality of transverse threads running essentially in a transverse direction of the band and binding with the longitudinal threads, wherein at least some of the transverse threads are constructed with electrically conductive material, at least some of the transverse threads are constructed with two-phase polymer material, a first polymer material phase of the two-phase polymer material having a higher melting temperature than a second polymer material phase of the two- Phase polymer material, and wherein the longitudinal threads are built up with polymer material and the polymer material of the longitudinal threads has a melting temperature above the melting temperature of the second polymer material phase.
  • the fabric tape be heat-set and that the melting temperature of the first Polymer material phase of the two-phase polymer material of the transverse threads and the melting temperature of the polymer material of the longitudinal threads are above a maximum heat-setting temperature and the melting temperature of the second polymer material phase of the two-phase polymer material of the transverse threads is less than or equal to the maximum heat-setting temperature.
  • the melting temperature of the second polymer material phase is advantageously at least 30 ° C. below the melting temperature of the first polymer material phase and / or below the melting temperature of the polymer material of the longitudinal threads. This is a sufficiently large distance to be able to set the heat setting temperature with sufficient accuracy so that it lies between these different melting temperatures.
  • the first polymeric material phase can comprise polyethylene terephthalate (PET) material.
  • the second polymer material phase can comprise polyethylene (PE) material.
  • the polymer material of the first transverse threads can be constructed with a single-phase polymer material which comprises, for example, polypropylene (PP), polyethylene (PE) or thermoplastic polyurethane (TPU).
  • PP polypropylene
  • PE polyethylene
  • TPU thermoplastic polyurethane
  • the two-phase polymer material can comprise the second polymer material phase in a range of 1-10% by weight, preferably 2-6% by weight, and the first polymer material phase in a range of 90-99% by weight, preferably 98-94 % By weight.
  • the polymer material of the longitudinal threads is a one-phase polymer material, this can preferably comprise polyethylene terephthalate (PET).
  • PET polyethylene terephthalate
  • the electrically conductive longitudinal and / or transverse threads can be constructed with polymer material, the polymer material of the electrically conductive longitudinal and / or transverse threads in particular being electrically conductive Contains particles, preferably carbo-nanotubes.
  • the electrically conductive cross threads can be designed as second cross threads, which are constructed with a different polymer material than the first cross threads.
  • the second transverse threads are constructed, for example, from a single-phase polymer material. It is also conceivable that the second cross threads have a smaller cross-sectional area than the first cross threads. In addition, the second transverse threads can also have a smaller cross-sectional area than the longitudinal threads.
  • the single-phase polymer material of the electrically conductive cross threads can comprise, for example, polyamide (PA).
  • the fabric tape when used as intended in the machine for producing spunbonded nonwoven webs, the fabric tape is exposed to an operating temperature that is above room temperature.
  • the polymer material of the first transverse threads is selected such that it softens at the operating temperature in such a way that the adherence of the spunbonded nonwoven web to the first transverse threads is increased compared to its adhesion to the first transverse threads at room temperature.
  • the operating temperature can range from 35 ° C to 90 ° C, especially 45 ° C to 70 ° C.
  • the polymer material of the first transverse threads is the two-phase polymer material
  • the proportion of the first to second polymer material phase of the two-phase polymer material is selected such that at the operating temperature, the first transverse threads built up from the two-phase polymer material are softened such that the adhesion of the Spun-bonded nonwoven web on these is increased compared to the adhesion at room temperature.
  • the length of the transverse threads extends transversely to the transport or machine direction of the fabric belt, a not inconsiderable proportion with which the spunbonded nonwoven web is carried along by the fabric belt is brought about by the transverse threads, in particular the first transverse threads.
  • the polymer material of the first transverse threads softens more at the operating temperature than the polymer material of the longitudinal threads, so that at the operating temperature the adhesion of the spunbonded nonwoven web to the first transverse threads is increased compared to the adhesion of the spunbonded nonwoven web to the longitudinal threads.
  • the longitudinal threads are advantageously warp threads and the transverse threads are advantageously weft threads.
  • the void volume described below can be determined by the micro-CT method described above.
  • the void volume accessible from the web material contact side is less than 0.45 mm 3 / mm 2 , preferably 0.40 mm 3 / mm 2 or less. Experiments by the applicant show that this measure further improves the support of the spunbonded nonwoven threads and thus the transport behavior of the spunbonded nonwoven web on the fabric belt.
  • the void volume accessible from the web material contact side should be understood to mean the void volume which is accessible from the web material contact side in a vertical projection.
  • the enclosed void volume ie the void volume
  • the enclosed void volume is less than 0.65 mm 3 / mm 2 , preferably less than 0.60 mm 3 / mm 2 .
  • the present invention further relates to a method for producing a spunbonded nonwoven web using the fabric tape according to the invention, comprising the application of spunbonded nonwoven threads to a web material contact side of the woven fabric tape moving in a tape movement direction in at least one, preferably a plurality, of spunbonded nonwoven thread application areas which follow one another in the tape movement direction a spunbond layer is deposited on the fabric belt by means of each spunbonded thread application area.
  • the process for producing a spunbonded nonwoven web differs from a process for producing a fibrous web such as paper, cardboard or tissue, for example in that a suspension of fibers and water is applied to the fabric belt in the latter, while the spunbonded web production process is carried out dry, i.e. the threads are placed on the fabric tape without a liquid as a carrier medium, such as water.
  • each spunbond filament application area comprises a plurality of spunbond filament extrusion nozzles which follow one another in the transverse direction of the band for delivering spunbond filament threads to the web material contact side of the fabric band.
  • the fabric tape which is basically constructed with an electrically conductive property, in the manufacturing process of spunbonded nonwoven webs, it is further proposed that the fabric tape moving in the tape movement or transport direction is electrically contacted on at least one side edge region.
  • Each spunbonded nonwoven layer preferably has a basis weight of less than 15 grams per m 2 , preferably less than 10 grams per m 2 , in particular a basis weight in the range from 1 to 15 grams per m 2 , preferably 1 to 10 grams per m 2 , particularly preferably 3 up to 8 grams per m 2 .
  • a spunbonded web generally has one to ten, often one to seven, spunbonded layers.
  • the fabric tape is kept at an operating temperature above room temperature, preferably at an operating temperature in the range of 35 ° C. or up to 90 ° C., particularly preferably in the range of 45 ° C. to 70 ° C., at least in the spunbond nonwoven application area.
  • the fabric tape moves in the tape movement direction preferably at a speed of 300 meters per minute or more, preferably from 350 to 1100 meters per minute, particularly preferably 600 to 1100 meters per minute.
  • the spunbonded nonwoven threads can essentially be made of polypropylene (PP) or of polyethylene (PE), or with a polypropylene core and a sheath of polyethylene (PE) enveloping it.
  • PP polypropylene
  • PE polyethylene
  • the fabric tape 10 is constructed with a plurality of longitudinal threads 12 extending in a tape longitudinal direction L, for example provided by warp threads, as well as transverse threads 14, 14 'extending essentially transversely to the tape longitudinal direction L, for example provided by weft threads.
  • the transverse threads comprise first transverse threads 14 and second transverse threads 14 '.
  • the longitudinal threads 12 and the transverse threads 14 bind to one another, so that, as for example on the basis of the Fig. 1 recognizable weave repeat R for a longitudinal thread 12 recognizable, convex longitudinal thread cranks 16 on a web material contact side 18 and longitudinal thread cranks 20 on a machine contact side 22 of the fabric tape 10 result. It can be seen, for example, in Fig.
  • the height difference h between the apexes of at least some of the convex longitudinal thread offsets S1 and the apexes of at least some of the first convex transverse thread offsets S2 on the web material contact side 18 is smaller than 220 ⁇ m.
  • the first transverse threads 14 of the fabric tape 10 are constructed with a two-phase polymer material.
  • a first of these polymer material phases can comprise PET material.
  • a second of these polymer material phases can comprise PE material.
  • the materials of the polymer material phases essentially do not mix during the production process of the first transverse threads 14, for example a melt-spinning process, so that areas with the material of the first polymer material phase and areas with the material of the second polymer material phase are present in the volume of the first transverse threads 14 will be.
  • the two polymer material phases are selected so that the polymer materials of the same have different melting temperatures.
  • the melting temperature of the second polymer material phase is below the melting temperature of the first polymer material phase, for example by at least 30 ° C.
  • the longitudinal threads 12 are advantageously also constructed with polymer material, preferably with a single phase or a single-phase polymer material, which has a melting temperature which is above the melting temperature of the second polymer material phase of the first transverse threads 14.
  • the longitudinal threads 12 with the building material the first polymer material phase for example PET material.
  • a heat-setting procedure can be carried out at a heat-setting temperature which is below the melting temperature of the building material of the first polymer material phase, but is above or at the melting temperature of the polymer material of the second polymer material phase.
  • This heat-fixing procedure which is generally carried out under tension in the longitudinal direction L of the tape, that is to say in the direction of the longitudinal threads 12, which can be carried out for the specified materials, for example at a heat-setting temperature of 180 ° C.
  • the fabric tape 10 also has an overall smoother or more even surface, which reduces the occurrence of marking effects in the web material produced, for example spunbonded fabric.
  • electrically conductive second transverse threads 14 ' are provided in the fabric band 10.
  • one or at least one such electrically conductive second transverse thread 14 ′ can be provided for each weave repeat R of the longitudinal threads 12.
  • These electrically conductive second transverse threads 14 ′ can be in contact with an electrical contact that is at ground potential in a side edge region of the fabric band 10, so that the entire fabric band 10 is also at ground potential and thus electrostatic charges cannot arise.
  • the electrically conductive second transverse threads 14 ' can also be constructed from polymer material, for example from a single-phase polymer material.
  • the single-phase polymer material of the electrically conductive transverse threads (14 ') can be, for example, polyamide (PA), in which electrically conductive particles, such as. B. carbo-nanotubes are embedded.
  • PA polyamide
  • the electrically conductive second transverse threads 14 ′ can be introduced into the fabric structure of the fabric tape 10 in the same way as the non-electrically conductive second cross threads 14, so that a fabric structure of the fabric tape 10 that is independent of this conductive characteristic can be achieved, for example with those already described above and in the Fig. 1 also recognizable floats 16, 20 on the web material contact side 18 or on the machine contact side 20.
  • a fabric structure of the fabric tape 10 that is independent of this conductive characteristic can be achieved, for example with those already described above and in the Fig. 1 also recognizable floats 16, 20 on the web material contact side 18 or on the machine contact side 20.
  • a portion of 40 to 50%, preferably 54 to 47%, of a total thread volume provided by the longitudinal threads 12 and the transverse threads 14, 14 ′ can be present in a fabric tape thickness range of 3/4 of the total fabric tape thickness starting from the web material contact side 18.
  • 30 to 45%, preferably 35 to 40%, of the total thread volume provided by the longitudinal threads 12 and the transverse threads 14, 14 ' can be provided in a fabric tape thickness range of 1/4 of the total fabric tape thickness starting from the web material contact side 18.
  • the fabric tape 10 constructed according to the invention is particularly suitable for the production of spunbonded nonwoven as a web material.
  • the spunbonded nonwoven threads are applied to the web material contact side 18 in the production process in spunbonded thread application areas.
  • Each such spunbonded thread application area can have a plurality of spunbonded thread extrusion nozzles which follow one another in the transverse direction of the band and via which the spunbonded nonwoven threads produced in the extrusion process are then applied to the web material contact side 18 of the fabric band 10.
  • spunbonded thread application areas can be arranged in succession in the longitudinal direction L of the belt, so that accordingly also several layers of Spunbonded threads can be deposited on the fabric belt 10 and can subsequently be subjected to a calendering process, for example, in order to consolidate the structure of the spunbonded nonwoven. Due to the provision of the electrically conductive second transverse threads 14 ′ in the fabric structure of the fabric belt 10, the formation of electrostatic charges, which could impair the depositing of the spunbonded nonwoven threads on the web material contact side 18 and the removal of the spunbonded nonwoven fabric from the fabric belt 10, is avoided.
  • the Figure 3 shows the longitudinal section of the fabric structure of the fabric tape 10 of the Figure 1 with identification of the different cavity volumes.
  • the void volume accessible from the web material contact side 18 is shown by the areas shaded from bottom left to top right. To maintain the void volume, the areas obtained in each longitudinal section plane are integrated.
  • the void volume accessible from the web material contact side 18 can, according to an advantageous embodiment of the invention, be less than 0.45 mm 3 / mm 2 , preferably 0.40 mm 3 / mm 2 or less.
  • the void volume accessible from the web material contact side 18 means the void volume that is accessible in a vertical projection from the web material contact side.
  • the enclosed void volume can also be seen, ie the void volume that is not accessible in a vertical projection either from the web material contact side or from the machine contact side.
  • the enclosed void volume is in the Figure 3 represented by the dotted areas. According to a preferred embodiment of the invention, it is provided that the enclosed cavity volume is less than 0.65 mm 3 / mm 2 , preferably less than 0.60 mm 3 / mm 2 .

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Woven Fabrics (AREA)

Description

Die vorliegende Erfindung betrifft ein Band zur Herstellung von Bahnenmaterial, wie z. B. Spinnvlies. Ein Band gemäß dem Oberbegriff von Anspruch 1 ist aus der US 5 746 887 A bekannt.The present invention relates to a tape for the production of sheet material, such as. B. Spunbond. A tape according to the preamble of claim 1 is from the US 5 746 887 A known.

Aus der EP 1 448 820 B1 ist eine Maschine zur Herstellung von Spinnvliesbahnen bekannt, welche als Formier- und Transportband ein Gewebeband mit einem sog. 4B-Webmuster, dort "4B Weave" genannt, zeigt.From the EP 1 448 820 B1 A machine for producing spunbonded nonwoven webs is known which shows a fabric belt with a so-called 4B weave pattern, there called "4B Weave", as the forming and transport belt.

Solche Gewebebänder haben oftmals, insbesondere für die Verwendung als Formier- und Transportbänder von Spinnvliesbahnen, sehr hohe Höhenunterschiede zwischen den durch Kröpfungen der Längsfäden und durch Kröpfungen der Querfäden bereitgestellten Teilen der Bahnmaterialkontaktseite. Die Erfahrung mit solchen Gewebebändern zeigt, dass die auf diesen geformten und anschließend transportierten Spinnvliesbahnen, die in der Regel pro Lage sehr geringe Flächengewichte von unter 20 Gramm/m2 haben, bei den in solchen Prozessen oftmals verwendeten Maschinengeschwindigkeiten von bis zu 1100 Meter pro Minute bspw. aufgrund von Luftverwirbelungen nicht zuverlässig transportiert werden können. Wenn zur Stabilisierung des Transports der Spinvliesbahnen das Vakuumlevel angehoben wird, werden diese Spinnvliesbahnen in die Webstruktur oftmals hineingezogen, wodurch diese bei einem nachfolgenden Übergabeprozess oftmals nur schwer wieder von den Gewebebändern abgenommen werden können.Such fabric belts often have very high differences in height between the parts of the web material contact side provided by cranking the longitudinal threads and by cranking the transverse threads, especially for use as forming and transport belts of spunbonded nonwoven webs. Experience with such fabric tapes shows that the spunbonded nonwoven webs formed on them and then transported, which generally have very low basis weights per layer of less than 20 grams / m 2 , with the machine speeds of up to 1100 meters per minute often used in such processes For example, cannot be transported reliably due to air turbulence. If the vacuum level is raised to stabilize the transport of the spin nonwoven webs, these spunbond nonwoven webs are often drawn into the weave structure, as a result of which it is often difficult to remove them from the fabric belts again in a subsequent transfer process.

Es ist daher die Aufgabe der vorliegenden Erfindung, ein Gewebeband zur Verwendung als Formungs- und Transportband für eine Maschine zur Herstellung von Spinnvliesbahnen vorzusehen, welches einen verbesserten initialen Fasersupport bietet, sodass eine Spinnvliesbahn auf diesen zuverlässiger transportiert und gleichzeitig wieder leichter von diesen abgenommen werden kann.It is therefore the object of the present invention to provide a fabric belt for use as a forming and transport belt for a machine To provide production of spunbonded nonwoven webs, which offers an improved initial fiber support, so that a spunbonded nonwoven web can be transported more reliably on them and at the same time can be removed more easily from them.

Erfindungsgemäß wird diese Aufgabe gelöst durch ein Gewebeband nach Anspruch 1. Das Gewebeband, auf dem bei bestimmungsgemäßer Verwendung in einer Maschine zur Herstellung von Spinnvliesbahnen solche Spinnvliesbahnen geformt und transportiert werden, umfasst eine Mehrzahl von im Wesentlichen in einer Bandlängsrichtung verlaufenden Längsfäden und eine Mehrzahl von im Wesentlichen in einer Bandquerrichtung verlaufenden und mit den Längsfäden abbindenden Querfäden, wobei die Längs- und die Querfäden im Wesentlichen aus einem Polymermaterial aufgebaut sind und ein Teil der Längs- und/oder der Querfäden elektrisch leitendes Material umfasst, wobei Längsfäden an der Bahnmaterialkontaktseite konvexe Längsfadenkröpfungen mit jeweiligem Scheitelpunkt ausbilden sowie die Querfäden erste Querfäden umfassen und die ersten Querfäden an der Bahnmaterialkontaktseite konvexe erste Querfadenkröpfungen mit jeweiligem Scheitelpunkt ausbilden.According to the invention, this object is achieved by a fabric tape according to claim 1. The fabric tape on which, when used as intended, in a machine for producing spunbonded webs, such spunbonded webs are formed and transported, comprises a plurality of longitudinal threads running essentially in a longitudinal direction of the tape and a plurality of them Cross threads running essentially in a tape transverse direction and binding with the longitudinal threads, the longitudinal threads and the transverse threads being essentially composed of a polymer material and a part of the longitudinal threads and / or the transverse threads comprising electrically conductive material, longitudinal threads having convex longitudinal thread offsets on the web material contact side Form respective apex and the transverse threads comprise first transverse threads and the first transverse threads form convex first transverse thread offsets with respective apex on the web material contact side.

Bei dem erfindungsgemäßen Gewebeband ist weiter vorgesehen, dass der Höhenunterschied zwischen den Scheitelpunkten zumindest einiger, insbesondere den konvexen Längsfadenkröpfungen und den Scheitelpunkten zumindest einiger, insbesondere den ersten konvexen Querfadenkröpfungen an der Bahnmaterialkontaktseite kleiner als 220µm, bevorzugt kleiner als 180µm, besonders bevorzugt kleiner als 150µm ist.In the fabric tape according to the invention it is further provided that the height difference between the apexes of at least some, in particular the convex, longitudinal thread offsets and the apexes of at least some, in particular the first, convex transverse thread offsets on the web material contact side is less than 220 µm, preferably less than 180 µm, particularly preferably less than 150 µm .

Ferner ist bei dem erfindungsgemäßen Gewebeband vorgesehen, dass das Polymermaterial der ersten Querfäden mit einem Zwei-Phasen-Polymermaterial aufgebaut ist, wobei eine erste Polymermaterialphase des Zwei-Phasen-Polymermaterials eine höhere Schmelztemperatur aufweist, als eine zweite Polymermaterialphase des Zwei-Phasen-Polymermaterials, und wobei die Längsfäden mit einem Polymermaterial, insbesondere mit einem Ein-Phasen-Polymermaterial, aufgebaut sind und das Polymermaterial der Längsfäden eine über der Schmelztemperatur der zweiten Polymermaterialphase liegende Schmelztemperatur aufweist.Furthermore, it is provided in the fabric tape according to the invention that the polymer material of the first transverse threads is built up with a two-phase polymer material, a first polymer material phase of the two-phase polymer material having a higher melting temperature than a second polymer material phase of the two-phase polymer material, and wherein the longitudinal threads with a polymer material, in particular with a Single-phase polymer material are constructed and the polymer material of the longitudinal threads has a melting temperature which is above the melting temperature of the second polymer material phase.

Dadurch, dass der Höhenunterschied zwischen den Scheitelpunkten von an der Bahnmaterialkontaktseite verlaufenden konvexen Längsfadenkröpfungen und ersten Querfadenkröpfungen kleiner als 220µm, bevorzugt kleiner als 180µm, besonders bevorzugt kleiner als 150µm ist, haben die Spinnvliesfäden bei deren Ablage auf die Bahnmaterialkontaktseite des Gewebebands eine höhenmäßig sehr gleichmäßige Unterstützung und tauchen daher nicht so tief in die Gewebestruktur ein, wie dies bei den aus dem Stand der Technik bekannten Gewebebändern der Fall ist. Dies bedeutet, dass die aus den Spinnvliesfäden gebildete Spinnvliesbahn eine hohe Kontaktfläche bei geringerem Eintauchen der Spinnvliesfäden in die Gewebestruktur erfährt. Im Ergebnis wird hierdurch eine bessere Anhaftung der Spinnvliesbahn am Gewebeband erreicht, ohne dass die Spinnvliesbahn ins Innere des Gewebebands hineingezogen wird.Due to the fact that the height difference between the vertices of convex longitudinal thread offsets and first transverse thread offsets running on the web material contact side is less than 220 µm, preferably less than 180 µm, particularly preferably less than 150 µm, the spunbonded nonwoven threads have a very uniform level of support when they are deposited on the web material contact side and therefore do not dive as deep into the fabric structure as is the case with the fabric tapes known from the prior art. This means that the spunbonded nonwoven web formed from the spunbonded nonwoven threads has a high contact area with less immersion of the spunbonded nonwoven threads in the fabric structure. As a result, better adherence of the spunbonded nonwoven web to the fabric band is achieved without the spunbonded nonwoven web being drawn into the interior of the fabric band.

Hierdurch wird ein deutlich verbessertes Transportverhalten gepaart mit einem deutlich verbesserten Abgabe- und Ablöseverhalten der Spinnvliesbahnen von dem Gewebeband erreicht.This results in a significantly improved transport behavior paired with a significantly improved delivery and detachment behavior of the spunbonded nonwoven webs from the fabric belt.

Ferner wird durch diese Gewebestruktur erreicht, dass Verschmutzungen, bspw. in Form von Polymertropfen, die von den Spinnfaden-Extrusionsdüsen auf das Gewebeband fallen können, nicht so tief in die Gewebestruktur hineinfallen. Hierdurch verschmutzen die erfindungsgemäßen Gewebebänder nicht so stark und lassen sich leichter reinigen.Furthermore, this fabric structure ensures that dirt, for example in the form of polymer drops, which can fall onto the fabric tape from the spinning thread extrusion nozzles, does not fall so deep into the fabric structure. As a result, the fabric tapes of the invention do not become so dirty and are easier to clean.

Der Höhenunterschied zwischen den Scheitelpunkten der konvexen Längsfadenkröpfungen und denen der ersten Querfadenkröpfungen wird in einer senkrecht zur Bahnmaterialkontaktseite verlaufenden Schnittebene bestimmt. Als Messmethodik kann bspw. das Röntgen-Mikrocomputertomographie-Verfahren, auch Micro-CT-Verfahren genannt, verwendet werden. Zur Messung wird eine Probe des zu messenden Gewebebands mit einem Durchmesser von 10 Millimeter in einer Druckkammer flach im Sandwich zwischen zwei Plexiglasplatten unter einen Druck von 0,1 MPa gesetzt. Die Messung wurde mit einer Auflösung von 8 Micrometern durchgeführt.The difference in height between the apexes of the convex longitudinal thread offsets and those of the first transverse thread offsets is determined in a cutting plane running perpendicular to the web material contact side. The X-ray micro-computed tomography method, also called micro-CT method, can be used as the measurement method. For the measurement, a sample of the tissue tape to be measured with a diameter of 10 millimeters in one Pressure chamber placed flat in the sandwich between two plexiglass plates under a pressure of 0.1 MPa. The measurement was carried out with a resolution of 8 micrometers.

Unter dem Begriff "Scheitelpunkt der konvexen Fadenkröpfung" ist der höchste Punkt der betrachteten Fadenkröpfung an der Bahnmaterialkontaktseite zu verstehen.The term "apex of the convex thread offset" is to be understood as the highest point of the thread offset considered on the web material contact side.

Zum Verständnis der Wirkung der Eingliederung der elektrisch leitenden Längs- und/oder Querfäden in das Gewebeband: Hierdurch wird die Möglichkeit geschaffen, dieses auch in Herstellungsprozessen einzusetzen, die, anders als im Papierherstellungsprozess, trocken ablaufen und somit der potentiellen Gefahr der Entstehung elektrostatischer Aufladungen unterliegen. Im Papierherstellungsprozess wird eine derartige elektrostatische Aufladung dadurch vermieden, dass der Prozess unter Einsatz einer großen Menge von aus dem zur Papierfertigung eingesetzten Rohmaterial zu entfernendem Wasser abläuft und somit die Gefahr einer elektrostatischen Aufladung grundsätzlich nicht gegeben ist. Insbesondere im Spinnvliesbahnenherstellungsprozess werden flüssige Trägermedien nicht eingesetzt, so dass durch das ständige Abrollen des Gewebebandes auf den dieses antreibenden und führenden Walzen einerseits und auch durch den Kontakt bzw. die Relativbewegung zwischen dem zu fertigenden Spinnvlies und dem Gewebeband elektrostatische Aufladungen entstehen können. Durch das Bereitstellen von elektrisch leitenden Querfäden besteht die Möglichkeit, das Gewebeband beispielsweise in einem seitlichen Bandbereich durch einen Schleifkontakt oder dergleichen elektrisch zu kontaktieren und auf Erdpotential zu setzen.To understand the effect of the incorporation of the electrically conductive longitudinal and / or transverse threads into the fabric tape: This creates the possibility to use this in manufacturing processes that, unlike in the paper manufacturing process, run dry and are therefore subject to the potential risk of electrostatic charges . Such an electrostatic charge is avoided in the paper manufacturing process in that the process is carried out using a large amount of water to be removed from the raw material used for the paper production, and therefore there is basically no risk of electrostatic charge. In particular, in the spunbonded web production process, liquid carrier media are not used, so that the continuous unwinding of the fabric band on the rollers driving and guiding it, on the one hand, and also the contact or the relative movement between the spunbonded fabric to be produced and the fabric band, can generate electrostatic charges. The provision of electrically conductive transverse threads makes it possible to make electrical contact with the fabric tape, for example in a lateral tape area, by means of a sliding contact or the like and to set it to earth potential.

Zu bemerken ist, dass bei der bestimmungsgemäßen Verwendung des erfindungsgemäßen Gewebebands dessen Bandlängsrichtung mit der Transportrichtung bzw. Bandbewegungsrichtung bzw. Maschinenrichtung zusammenfallen. Die Begriffe Transportrichtung oder Bandbewegungsrichtung oder Maschinenrichtung sind hierbei als synonym zu betrachten.It should be noted that when the fabric tape according to the invention is used as intended, its tape longitudinal direction coincides with the transport direction or tape movement direction or machine direction. The terms transport direction or belt movement direction or machine direction are to be regarded as synonymous.

Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous refinements and developments of the invention are specified in the subclaims.

Konkret kann die erfindungsgemäße Lösung bspw. dadurch realisiert werden, indem vorgesehen ist, dass das Polymermaterial der Längsfäden und das Polymermaterial der ersten Querfäden derart ausgewählt ist und das Gewebeband so heißfixiert ist, dass die ersten Querfäden gegenüber ihrem Zustand vor dem Heißfixieren stärker verformt wurden als die Längsfäden gegenüber deren Zustand vor dem Heißfixieren verformt wurden. Bei der Heißfixierung wurden hierbei die Längsfäden einer Zugspannung ausgesetzt, während auf die Längs- und Querfäden eine Temperatureinwirkung von wenigstens 150°C, bevorzugt im Bereich von 180 bis 200°C erfolgt.Specifically, the solution according to the invention can be realized, for example, by providing that the polymer material of the longitudinal threads and the polymer material of the first transverse threads is selected in such a way and the fabric tape is so heat-set that the first cross-threads were deformed more than their state before the heat-setting than the longitudinal threads were deformed in relation to their condition before the heat setting. In the heat setting, the longitudinal threads were subjected to tensile stress, while the longitudinal and transverse threads were subjected to a temperature of at least 150 ° C., preferably in the range from 180 to 200 ° C.

Weiterhin wird ein Gewebeband zur Herstellung von Bahnmaterial, insbesondere zur Verwendung in einer Maschine zur Herstellung von Spinnvliesbahnen, offenbart, umfassend eine Mehrzahl von im Wesentlichen in einer Bandlängsrichtung verlaufenden Längsfäden und eine Mehrzahl von im Wesentlichen in einer Bandquerrichtung verlaufenden und mit den Längsfäden abbindenden Querfäden, wobei wenigstens ein Teil der Querfäden mit elektrisch leitendem Material aufgebaut ist, wobei wenigstens ein Teil der Querfäden mit Zwei-Phasen-Polymermaterial aufgebaut ist, wobei eine erste Polymermaterialphase des Zwei-Phasen-Polymermaterials eine höhere Schmelztemperatur aufweist, als eine zweite Polymermaterialphase des Zwei-Phasen-Polymermaterials, und wobei die Längsfäden mit Polymermaterial aufgebaut sind und das Polymermaterial der Längsfäden eine über der Schmelztemperatur der zweiten Polymermaterialphase liegende Schmelztemperatur aufweist.Furthermore, a fabric band for producing web material, in particular for use in a machine for producing spunbonded nonwoven webs, is disclosed, comprising a plurality of longitudinal threads running essentially in a longitudinal direction of the band and a plurality of transverse threads running essentially in a transverse direction of the band and binding with the longitudinal threads, wherein at least some of the transverse threads are constructed with electrically conductive material, at least some of the transverse threads are constructed with two-phase polymer material, a first polymer material phase of the two-phase polymer material having a higher melting temperature than a second polymer material phase of the two- Phase polymer material, and wherein the longitudinal threads are built up with polymer material and the polymer material of the longitudinal threads has a melting temperature above the melting temperature of the second polymer material phase.

Um auch bei dem insbesondere für den Spinnvliesbahn Herstellungsprozess geeigneten Gewebeband eine stabile Gewebestruktur, insbesondere stabil in einer Bandlängsrichtung, erzeugen zu können, wird vorgeschlagen, dass das Gewebeband heißfixiert ist, und dass die Schmelztemperatur der ersten Polymermaterialphase des Zwei-Phasen-Polymermaterials der Querfäden und die Schmelztemperatur des Polymermaterials der Längsfäden über einer maximalen Heißfixiertemperatur liegen und die Schmelztemperatur der zweiten Polymermaterialphase des Zwei-Phasen-Polymermaterials der Querfäden kleiner oder gleich der maximalen Heißfixiertemperatur ist.In order to be able to produce a stable fabric structure, in particular stable in a longitudinal direction of the tape, also in the fabric tape that is particularly suitable for the spunbonded web production process, it is proposed that the fabric tape be heat-set and that the melting temperature of the first Polymer material phase of the two-phase polymer material of the transverse threads and the melting temperature of the polymer material of the longitudinal threads are above a maximum heat-setting temperature and the melting temperature of the second polymer material phase of the two-phase polymer material of the transverse threads is less than or equal to the maximum heat-setting temperature.

Vorteilhafterweise ist die Schmelztemperatur der zweiten Polymermaterialphase wenigstens 30 °C unter der Schmelztemperatur der ersten Polymermaterialphase oder/und unter der Schmelztemperatur des Polymermaterials der Längsfäden. Dies ist ein ausreichend großer Abstand, um mit hinreichender Genauigkeit die Heißfixiertemperatur so einstellen zu können, dass sie zwischen diesen verschiedenen Schmelztemperaturen liegt.The melting temperature of the second polymer material phase is advantageously at least 30 ° C. below the melting temperature of the first polymer material phase and / or below the melting temperature of the polymer material of the longitudinal threads. This is a sufficiently large distance to be able to set the heat setting temperature with sufficient accuracy so that it lies between these different melting temperatures.

Die erste Polymermaterialphase kann Polyethylentherephthalat (PET) - Material umfassen. Ferner kann die zweite Polymermaterialphase Polyethylen (PE)-Material umfassen.The first polymeric material phase can comprise polyethylene terephthalate (PET) material. Furthermore, the second polymer material phase can comprise polyethylene (PE) material.

Alternativ zum Zwei-Phasen-Polymermaterial kann das Polymermaterial der ersten Querfäden mit einem Ein-Phasen-Polymermaterial aufgebaut sein, welches bspw. Polypropylen (PP), Polyethylen (PE) oder thermoplastischem Polyurethan (TPU) umfasst.As an alternative to the two-phase polymer material, the polymer material of the first transverse threads can be constructed with a single-phase polymer material which comprises, for example, polypropylene (PP), polyethylene (PE) or thermoplastic polyurethane (TPU).

Das Zwei-Phasen-Polymermaterial kann die zweite Polymermaterialphase in einem Bereich von 1-10 Gew.-%, vorzugsweise 2-6 Gew-% umfassen sowie die erste Polymermaterialphase in einem Bereich von 90-99 Gew.-%, vorzugsweise 98-94 Gew-%.The two-phase polymer material can comprise the second polymer material phase in a range of 1-10% by weight, preferably 2-6% by weight, and the first polymer material phase in a range of 90-99% by weight, preferably 98-94 % By weight.

Ist das Polymermaterial der Längsfäden ein Ein-Phasen-Polymermaterial, so kann dieses vorzugsweise Polyethylenterephthalat (PET) umfassen.If the polymer material of the longitudinal threads is a one-phase polymer material, this can preferably comprise polyethylene terephthalate (PET).

Ferner können die elektrisch leitenden Längs- und/oder Querfäden mit Polymermaterial aufgebaut sein, wobei das Polymermaterial der elektrisch leitenden Längs- und/oder Querfäden insbesondere elektrisch leitende Partikel, vorzugsweise Carbo-Nanotubes, enthält.Furthermore, the electrically conductive longitudinal and / or transverse threads can be constructed with polymer material, the polymer material of the electrically conductive longitudinal and / or transverse threads in particular being electrically conductive Contains particles, preferably carbo-nanotubes.

Die elektrisch leitenden Querfäden können als zweite Querfäden ausgebildet sein, die mit einem anderen Polymermaterial als die ersten Querfäden aufgebaut sind. Denkbar ist in diesem Zusammenhang, dass die zweiten Querfäden bspw. aus einem Ein-Phasen-Polymermaterial aufgebaut sind. Weiter ist es denkbar, dass die zweiten Querfäden eine kleinere Querschnittsfläche haben als die ersten Querfäden. Zusätzlich können die zweiten Querfäden auch noch eine kleinere Querschnittsfläche haben als die Längsfäden. Das Ein-Phasen-Polymermaterial der elektrisch leitenden Querfäden kann bspw. Polyamid (PA) umfassen.The electrically conductive cross threads can be designed as second cross threads, which are constructed with a different polymer material than the first cross threads. In this context, it is conceivable that the second transverse threads are constructed, for example, from a single-phase polymer material. It is also conceivable that the second cross threads have a smaller cross-sectional area than the first cross threads. In addition, the second transverse threads can also have a smaller cross-sectional area than the longitudinal threads. The single-phase polymer material of the electrically conductive cross threads can comprise, for example, polyamide (PA).

In der Regel ist das Gewebeband bei seiner bestimmungsgemäßen Verwendung in der Maschine zur Herstellung von Spinnvliesbahnen einer über der Raumtemperatur liegenden Betriebstemperatur ausgesetzt. Nach einer besonders bevorzugten Ausgestaltung der Erfindung ist vorgesehen, dass das Polymermaterial der ersten Querfäden derart ausgewählt ist, dass dieses bei der Betriebstemperatur derart erweicht, dass die Anhaftung der Spinnvliesbahn an den ersten Querfäden gegenüber deren Anhaftung an den ersten Querfäden bei Raumtemperatur erhöht ist. Durch diese Maßnahme kann die Anhaftung der Spinnvliesbahn an dem Gewebeband weiter erhöht werden, wodurch der Transport der Spinnvliesbahn auf dem Gewebeband deutlich zuverlässiger wird.As a rule, when used as intended in the machine for producing spunbonded nonwoven webs, the fabric tape is exposed to an operating temperature that is above room temperature. According to a particularly preferred embodiment of the invention, it is provided that the polymer material of the first transverse threads is selected such that it softens at the operating temperature in such a way that the adherence of the spunbonded nonwoven web to the first transverse threads is increased compared to its adhesion to the first transverse threads at room temperature. With this measure, the adherence of the spunbonded nonwoven web to the fabric belt can be increased further, as a result of which the transport of the spunbonded nonwoven web on the fabric belt is significantly more reliable.

Die Betriebstemperatur kann im Bereich von 35°C bis 90°C, insbesondere 45°C bis 70°C liegen.The operating temperature can range from 35 ° C to 90 ° C, especially 45 ° C to 70 ° C.

Handelt es sich bei dem Polymermaterial der ersten Querfäden um das Zwei-Phasen-Polymermaterial, so ist nach einer konkreten bevorzugten Ausgestaltung vorgenannten Weiterbildung der Erfindung insbesondere vorgesehen, dass der Anteil von erster zu zweiter Polymermaterialphase des Zwei-Phasen-Polymermaterials derart ausgewählt ist, dass bei der Betriebstemperatur die aus dem Zwei-Phasen-Polymermaterial aufgebauten ersten Querfäden derart erweicht sind, dass die Anhaftung der Spinnvliesbahn an diesen gegenüber der Anhaftung bei Raumtemperatur erhöht ist.If the polymer material of the first transverse threads is the two-phase polymer material, then according to a specific preferred embodiment of the aforementioned development of the invention, it is provided in particular that the proportion of the first to second polymer material phase of the two-phase polymer material is selected such that at the operating temperature, the first transverse threads built up from the two-phase polymer material are softened such that the adhesion of the Spun-bonded nonwoven web on these is increased compared to the adhesion at room temperature.

Da sich die Querfäden in ihrer Länge quer zur Transport- bzw. Maschinenrichtung des Gewebebands erstrecken, wird ein nicht zu vernachlässigender Anteil mit der die Spinnvliesbahn durch das Gewebeband mitgenommen wird durch die Querfäden, insbesondere die ersten Querfäden bewirkt. Zur Verstärkung dieses Effekts ist es insbesondere sinnvoll, wenn bei der Betriebstemperatur das Polymermaterial der ersten Querfäden stärker erweicht als das Polymermaterial der Längsfäden, so dass bei der Betriebstemperatur die Anhaftung der Spinnvliesbahn an den ersten Querfäden gegenüber der Anhaftung der Spinnvliesbahn an den Längsfäden erhöht ist.Since the length of the transverse threads extends transversely to the transport or machine direction of the fabric belt, a not inconsiderable proportion with which the spunbonded nonwoven web is carried along by the fabric belt is brought about by the transverse threads, in particular the first transverse threads. To reinforce this effect, it is particularly useful if the polymer material of the first transverse threads softens more at the operating temperature than the polymer material of the longitudinal threads, so that at the operating temperature the adhesion of the spunbonded nonwoven web to the first transverse threads is increased compared to the adhesion of the spunbonded nonwoven web to the longitudinal threads.

Bei dem erfindungsgemäßen Gewebeband sind vorteilhafterweise die Längsfäden Kettfäden und die Querfäden sind vorteilhafterweise Schussfäden.In the fabric tape according to the invention, the longitudinal threads are advantageously warp threads and the transverse threads are advantageously weft threads.

Das im Folgenden beschriebene Hohlraumvolumen kann durch das oben beschriebene Mikro-CT Verfahren bestimmt werden.The void volume described below can be determined by the micro-CT method described above.

Nach einer weiteren bevorzugten Ausgestaltung der Erfindung ist vorgesehen, dass das von der Bahnmaterialkontaktseite her zugängliche Hohlraumvolumen weniger als 0,45 mm3/mm2, bevorzugt 0,40 mm3/mm2 oder weniger ist. Versuche der Anmelderin zeigen, dass durch diese Maßnahme die Unterstützung der Spinnvliesfäden und somit das Transportverhalten der Spinnvliesbahn auf dem Gewebeband weiter verbessert wird. Unter dem von der Bahnmaterialkontaktseite her zugänglichen Hohlraumvolumen soll das Hohlraumvolumen verstanden werden, welches in senkrechter Projektion von der Bahnmaterialkontaktseite her zugänglich ist.According to a further preferred embodiment of the invention, it is provided that the void volume accessible from the web material contact side is less than 0.45 mm 3 / mm 2 , preferably 0.40 mm 3 / mm 2 or less. Experiments by the applicant show that this measure further improves the support of the spunbonded nonwoven threads and thus the transport behavior of the spunbonded nonwoven web on the fabric belt. The void volume accessible from the web material contact side should be understood to mean the void volume which is accessible from the web material contact side in a vertical projection.

Da sich erfahrungsgemäß im eingeschlossenen Hohlraumvolumen d.h. dem Hohlraumvolumen das in senkrechter Projektion weder von der Bahnmaterialkontaktseite noch von der Maschinenkontaktseite her zugänglich ist, vermehrt Verunreinigungen ansammeln und sich diese nicht oder nur sehr schlecht wieder herausreinigen lassen, ist nach einer weiteren bevorzugten Ausgestaltung der Erfindung vorgesehen, dass das eingeschlossene Hohlraumvolumen, weniger als 0,65 mm3/mm2, bevorzugt weniger als 0,60 mm3/mm2 ist.Since experience has shown that the enclosed void volume, ie the void volume, does not project in a vertical projection either from the web material contact side or from the machine contact side is accessible, increased accumulation of impurities and it is difficult or impossible to clean them out again, according to a further preferred embodiment of the invention it is provided that the enclosed void volume is less than 0.65 mm 3 / mm 2 , preferably less than 0.60 mm 3 / mm 2 .

Um insbesondere zu verhindern oder zu reduzieren, dass die auf der Bahnmaterialkontaktseite geführte Spinnvliesbahn durch ein an der Maschinenkontaktseite anliegendes Vakuum ins Innere der Gewebestruktur des Gewebebands gezogen wird, ist nach einer weiteren bevorzugten Ausgestaltung der Erfindung vorgesehen, dass kein Hohlraumvolumen vorhanden ist, welches die Bahnmaterialkontaktseite mit der Maschinenkontaktseite direkt verbindet. Unter direkter Verbindung soll verstanden werden, dass es keine Kanäle gibt, welche die Bahnmaterialkontaktseite mit der Maschinenkontaktseite in senkrechter Projektion miteinander verbinden.In order to prevent or reduce, in particular, that the spunbonded nonwoven web guided on the web material contact side is drawn into the interior of the fabric structure of the fabric belt by a vacuum applied to the machine contact side, according to a further preferred embodiment of the invention it is provided that there is no void volume which the web material contact side connects directly to the machine contact side. A direct connection is to be understood to mean that there are no channels which connect the web material contact side to the machine contact side in a vertical projection.

Die vorliegende Erfindung betrifft ferner ein Verfahren zur Herstellung einer Spinnvliesbahn unter Verwendung des erfindungsgemäßen Gewebebands, umfassend das Aufbringen von Spinnvliesfäden auf eine Bahnmaterialkontaktseite des in einer Bandbewegungsrichtung sich bewegenden Gewebebandes in wenigstens einem, vorzugsweise einer Mehrzahl von in der Bandbewegungsrichtung aufeinander folgenden Spinnvliesfaden-Aufbringungsbereichen, wobei mittels jedem Spinnvliesfaden-Aufbringungsbereich eine Spinnvlieslage auf dem Gewebeband abgelegt wird.The present invention further relates to a method for producing a spunbonded nonwoven web using the fabric tape according to the invention, comprising the application of spunbonded nonwoven threads to a web material contact side of the woven fabric tape moving in a tape movement direction in at least one, preferably a plurality, of spunbonded nonwoven thread application areas which follow one another in the tape movement direction a spunbond layer is deposited on the fabric belt by means of each spunbonded thread application area.

Das Verfahren zur Herstellen einer Spinnvliesbahn unterscheidet sich von einem Verfahren zur Herstellung einer Faserstoffbahn wie Papier, Karton oder Tissue bspw. dadurch, dass beim zuletzt Genannten eine Suspension aus Fasern und Wasser auf das Gewebeband aufgebracht wird, während das Spinnvliesbahnherstellungsverfahren trocken erfolgt, d.h. die Fäden werden ohne eine Flüssigkeit als Trägermedium, wie bspw. Wasser, auf das Gewebeband abgelegt.The process for producing a spunbonded nonwoven web differs from a process for producing a fibrous web such as paper, cardboard or tissue, for example in that a suspension of fibers and water is applied to the fabric belt in the latter, while the spunbonded web production process is carried out dry, i.e. the threads are placed on the fabric tape without a liquid as a carrier medium, such as water.

Denkbar ist, dass jeder Spinnvliesfaden-Aufbringungsbereich eine Vielzahl von in der Bandquerrichtung aufeinander folgenden Spinnvliesfaden-Extrusionsdüsen zur Abgabe von Spinnvliesfäden auf die Bahnmaterialkontaktseite des Gewebebandes umfasst.It is conceivable that each spunbond filament application area comprises a plurality of spunbond filament extrusion nozzles which follow one another in the transverse direction of the band for delivering spunbond filament threads to the web material contact side of the fabric band.

Um bei dem grundsätzlich mit elektrisch leitender Eigenschaft aufgebauten Gewebeband im Herstellungsprozess von Spinnvliesbahnen das Entstehen von elektrostatischen Aufladungen zu verhindern, wird weiter vorgeschlagen, dass das sich in der Bandbewegungs- oder Transportrichtung bewegende Gewebeband an wenigstens einem Seitenrandbereich elektrisch kontaktiert wird.In order to prevent the formation of electrostatic charges in the fabric tape, which is basically constructed with an electrically conductive property, in the manufacturing process of spunbonded nonwoven webs, it is further proposed that the fabric tape moving in the tape movement or transport direction is electrically contacted on at least one side edge region.

Vorzugsweise hat jede Spinnvlieslage ein Flächengewicht von weniger als 15 Gramm pro m2, bevorzugt weniger als 10 Gramm pro m2, insbesondere ein Flächengewicht im Bereich von 1 bis 15 Gramm pro m2, bevorzugt 1 bis 10 Gramm pro m2, besonders bevorzugt 3 bis 8 Gramm pro m2.Each spunbonded nonwoven layer preferably has a basis weight of less than 15 grams per m 2 , preferably less than 10 grams per m 2 , in particular a basis weight in the range from 1 to 15 grams per m 2 , preferably 1 to 10 grams per m 2 , particularly preferably 3 up to 8 grams per m 2 .

Eine Spinnvliesbahn hat in der Regel ein bis zehn, oftmals ein bis sieben Spinnvlieslagen.A spunbonded web generally has one to ten, often one to seven, spunbonded layers.

Des Weiteren ist vorgesehen, dass das Gewebeband zumindest im Spinnvliesfaden-Aufbringungsbereich auf einer Betriebstemperatur oberhalb der Raumtemperatur gehalten wird, bevorzugt auf einer Betriebstemperatur im Bereich von 35°C oder bis 90°C, besonders bevorzugt im Bereich 45°C bis 70°C.Furthermore, it is provided that the fabric tape is kept at an operating temperature above room temperature, preferably at an operating temperature in the range of 35 ° C. or up to 90 ° C., particularly preferably in the range of 45 ° C. to 70 ° C., at least in the spunbond nonwoven application area.

Im Verfahren bewegt sich das Gewebeband in der Bandbewegungsrichtung vorzugsweise mit einer Geschwindigkeit von 300 Meter pro Minute oder mehr, bevorzugt von 350 bis 1100 Meter pro Minute, besonders bevorzugt 600 bis 1100 Meter pro Minute. Durch die Vorsehung des erfindungsgemäßen Gewebebands kann die Spinnvliesbahn bis zu den hohen Geschwindigkeiten des angegebenen Bereichs zuverlässig transportiert werden.In the method, the fabric tape moves in the tape movement direction preferably at a speed of 300 meters per minute or more, preferably from 350 to 1100 meters per minute, particularly preferably 600 to 1100 meters per minute. By providing the fabric tape according to the invention, the spunbonded nonwoven web can be reliably transported up to the high speeds of the specified range.

Die Spinnvliesfäden können im Wesentlichen aus Polypropylen (PP) oder aus Polyethylen (PE), oder mit einem Polypropylen-Kern und einem diesen umhüllenden Mantel aus Polyethylen (PE) aufgebaut sein.The spunbonded nonwoven threads can essentially be made of polypropylene (PP) or of polyethylene (PE), or with a polypropylene core and a sheath of polyethylene (PE) enveloping it.

Die vorliegende Erfindung wird nachfolgend mit Bezug auf die folgenden Figuren weiter beschrieben. Es zeigen

Figur 1
einen Teil-Längsschnitt der Gewebestruktur eines Gewebebandes zur Herstellung von Spinnvliesbahnen,
Figur 2
den Längsschnitt der Gewebestruktur des Gewebebands der Figur 1 mit Bezeichnung der Scheitelpunkte und
Figur 3
den Längsschnitt der Gewebestruktur des Gewebebands der Figur 1 mit Kennzeichnung der verschiedenen Hohlraumvolumina.
The present invention is further described below with reference to the following figures. Show it
Figure 1
a partial longitudinal section of the fabric structure of a fabric tape for the production of spunbonded webs,
Figure 2
the longitudinal section of the fabric structure of the fabric tape Figure 1 with description of the vertices and
Figure 3
the longitudinal section of the fabric structure of the fabric tape Figure 1 with identification of the different cavity volumes.

Das Gewebeband 10 ist mit einer Mehrzahl von in einer Bandlängsrichtung L sich erstreckenden Längsfäden 12, beispielsweise bereitgestellt durch Kettfäden, sowie im Wesentlichen quer zur Bandlängsrichtung L sich erstreckenden Querfäden 14, 14' beispielsweise bereitgestellt durch Schussfäden, aufgebaut. Die Querfäden umfassen erste Querfäden 14 und zweite Querfäden 14'. Die Längsfäden 12 und die Querfäden 14 binden aneinander ab, so dass, wie beispielsweise anhand des in der Fig. 1 erkennbaren Bindungsrapportes R für einen Längsfaden 12 erkennbar, sich konvexe Längsfadenkröpfungen 16 an einer Bahnmaterialkontaktseite 18 sowie Längsfadenkröpfungen 20 an einer Maschinenkontaktseite 22 des Gewebebandes 10 ergeben. Erkennbar ist beispielsweise in Fig. 1, dass die bahnmaterialkontaktseitigen Längsfadenkröpfungen 16 sich über drei Querfäden 14, 14' hinweg erstrecken und hierbei einen Scheitelpunkt S1 ausbilden, während die maschinenkontaktseitigen Längsfadenkröpfungen 20 sich beispielsweise über fünf erste Querfäden 14 hinweg erstrecken. Dadurch entsteht an der Bahnmaterialkontaktseite 18 eine vergleichsweise geschlossene Struktur, im Wesentlichen bereitgestellt durch die dort zum Vorschein kommenden Querfäden 14. An der Maschinenkontaktseite 22 entsteht durch die dort vorhandenen vergleichsweise langen Längsfadenkröpfungen 20 eine insbesondere im Kontakt mit den ein derartiges Gewebeband 10 antreibenden bzw. umlenkenden Walzen sehr verschleißresistente Oberfläche. In der Darstellung der Figuren 1 bis 3 sind die Kröpfungen der Querfäden, d.h. die Querfadenkröpfungen, nicht zu erkennen. Da die Längsschnittebene vorliegend so gewählt ist, dass diese zumindest einige der ersten Querfäden 14 an der Stelle schneidet, an der diese einen Scheitelpunkt S2 der konvexen ersten Querfadenkröpfungen an der Bahnmaterialkontaktseite 18 ausbilden.The fabric tape 10 is constructed with a plurality of longitudinal threads 12 extending in a tape longitudinal direction L, for example provided by warp threads, as well as transverse threads 14, 14 'extending essentially transversely to the tape longitudinal direction L, for example provided by weft threads. The transverse threads comprise first transverse threads 14 and second transverse threads 14 '. The longitudinal threads 12 and the transverse threads 14 bind to one another, so that, as for example on the basis of the Fig. 1 recognizable weave repeat R for a longitudinal thread 12 recognizable, convex longitudinal thread cranks 16 on a web material contact side 18 and longitudinal thread cranks 20 on a machine contact side 22 of the fabric tape 10 result. It can be seen, for example, in Fig. 1 that the longitudinal thread crankings 16 on the web material contact side extend over three transverse threads 14, 14 'and in this case form an apex S1, while the machine contact-side longitudinal thread crankings 20 extend, for example, over five first transverse threads 14. This creates a comparatively closed structure on the web material contact side 18, essentially provided by that for Apparent transverse threads 14. On the machine contact side 22, the comparatively long longitudinal thread cranks 20 present there create a surface that is very wear-resistant, particularly in contact with the rollers driving or deflecting such a fabric belt 10. In the representation of the Figures 1 to 3 the cranks of the cross threads, ie the cross thread cranks, cannot be seen. Since the longitudinal section plane is selected in the present case such that it cuts at least some of the first transverse threads 14 at the point at which they form an apex S2 of the convex first transverse thread crankings on the web material contact side 18.

Mit Blick auf die Figur 2 erkennt man den Scheitelpunkt S1 des Längsfadens 12 sowie die Scheitelpunkte S2 der ersten Querfäden 14 an der Bahnmaterialkontaktseite 18. Erfindungsgemäß ist der Höhenunterschied h zwischen den Scheitelpunkten zumindest einiger der konvexen Längsfadenkröpfungen S1 und den Scheitelpunkten zumindest einiger der ersten konvexen Querfadenkröpfungen S2 an der Bahnmaterialkontaktseite 18 kleiner als 220µm.With view on Figure 2 one can see the apex S1 of the longitudinal thread 12 and the apexes S2 of the first transverse threads 14 on the web material contact side 18. According to the invention, the height difference h between the apexes of at least some of the convex longitudinal thread offsets S1 and the apexes of at least some of the first convex transverse thread offsets S2 on the web material contact side 18 is smaller than 220µm.

Vorliegend sind die ersten Querfäden 14 des Gewebebandes 10 mit einem Zwei-Phasen-Polymermaterial aufgebaut. Eine erste dieser Polymermaterialphasen kann PET-Material umfassen. Eine zweite dieser Polymermaterialphasen kann PE-Material umfassen. Die Materialien der Polymermaterialphasen durchmischen sich bei dem Herstellungsvorgang der ersten Querfäden 14, beispielsweise einem Schmelz-Spinn-Prozess, im Wesentlichen nicht, so dass im Volumen der ersten Querfäden 14 Bereiche mit dem Material der ersten Polymermaterialphase und Bereiche mit dem Material der zweiten Polymermaterialphase vorhanden sein werden.In the present case, the first transverse threads 14 of the fabric tape 10 are constructed with a two-phase polymer material. A first of these polymer material phases can comprise PET material. A second of these polymer material phases can comprise PE material. The materials of the polymer material phases essentially do not mix during the production process of the first transverse threads 14, for example a melt-spinning process, so that areas with the material of the first polymer material phase and areas with the material of the second polymer material phase are present in the volume of the first transverse threads 14 will be.

Die beiden Polymermaterialphasen sind so ausgewählt, dass die Polymermaterialien derselben unterschiedliche Schmelztemperaturen aufweisen. Die Schmelztemperatur der zweiten Polymermaterialphase liegt unter der Schmelztemperatur der ersten Polymermaterialphase, beispielsweise um wenigstens 30 °C.The two polymer material phases are selected so that the polymer materials of the same have different melting temperatures. The melting temperature of the second polymer material phase is below the melting temperature of the first polymer material phase, for example by at least 30 ° C.

Die Längsfäden 12 sind vorteilhafterweise ebenfalls mit Polymermaterial, vorzugsweise mit einer einzigen Phase bzw. einem Ein-Phasen-Polymermaterial, aufgebaut, das eine Schmelztemperatur aufweist, die über der Schmelztemperatur der zweiten Polymermaterialphase der ersten Querfäden 14. Beispielsweise können die Längsfäden 12 mit dem Aufbaumaterial der ersten Polymermaterialphase, also beispielsweise PET-Material, aufgebaut sein.The longitudinal threads 12 are advantageously also constructed with polymer material, preferably with a single phase or a single-phase polymer material, which has a melting temperature which is above the melting temperature of the second polymer material phase of the first transverse threads 14. For example, the longitudinal threads 12 with the building material the first polymer material phase, for example PET material.

Im Herstellungsprozess eines derartigen Gewebebandes kann nach Durchführung des Webvorgangs eine Heißfixierungsprozedur bei einer Heißfixiertemperatur durchgeführt werden, die unter der Schmelztemperatur des Aufbaumaterials der ersten Polymermaterialphase liegt, jedoch über oder bei der Schmelztemperatur des Polymermaterials der zweiten Polymermaterialphase liegt. Diese im Allgemeinen unter Spannung in Bandlängsrichtung L, also in Richtung der Längsfäden 12 durchgeführte Heißfixierungsprozedur, die bei den angegebenen Materialien beispielsweise bei einer Heißfixiertemperatur von 180 °C bis 190 °C durchgeführt werden kann, führt zu einer zumindest teilweisen Erweichung des Polymermaterials der zweiten Polymermaterialphase, während das Polymermaterial der ersten Polymermaterialphase und das Polymermaterial der Längsfäden 12 im Wesentlichen nicht erweicht bzw. aufgeschmolzen wird. Dadurch bleibt einerseits die Konsistenz insbesondere der ersten Querfäden 14 noch erhalten. Andererseits führt die Erweichung der zweiten Polymermaterialphase in Verbindung mit der auch aufgebrachten Spannung in der Bandlängsrichtung L dazu, dass die ersten Querfäden 14 sich näher an die Längsfäden 12 anschmiegen. Die Folge davon ist eine noch weiter geschlossene Gewebestruktur, bei welcher das Auftreten von Hohlräumen im Inneren derselben weitestgehend vermieden wird und überdies die Dicke des Gewebebandes 10 verringert ist. Aufgrund der besseren Aneinanderschmiegung der ersten Querfäden 14 und der Längsfäden 12 hat das Gewebeband 10 auch eine insgesamt glattere bzw. ebenere Oberfläche, was das Auftreten von Markierungseffekten im hergestellten Bahnenmaterial, also beispielsweise Spinnvlies, vermindert.In the manufacturing process of such a fabric band, after the weaving process has been carried out, a heat-setting procedure can be carried out at a heat-setting temperature which is below the melting temperature of the building material of the first polymer material phase, but is above or at the melting temperature of the polymer material of the second polymer material phase. This heat-fixing procedure, which is generally carried out under tension in the longitudinal direction L of the tape, that is to say in the direction of the longitudinal threads 12, which can be carried out for the specified materials, for example at a heat-setting temperature of 180 ° C. to 190 ° C., leads to an at least partial softening of the polymer material in the second polymer material phase , while the polymer material of the first polymer material phase and the polymer material of the longitudinal threads 12 are essentially not softened or melted. As a result, the consistency of the first transverse threads 14 in particular is still retained. On the other hand, the softening of the second polymer material phase in conjunction with the tension also applied in the longitudinal direction L of the tape leads to the first transverse threads 14 nestling closer to the longitudinal threads 12. The result of this is an even more closed fabric structure, in which the occurrence of voids in the interior thereof is largely avoided and, moreover, the thickness of the fabric tape 10 is reduced. Due to the better nestling of the first transverse threads 14 and the longitudinal threads 12, the fabric tape 10 also has an overall smoother or more even surface, which reduces the occurrence of marking effects in the web material produced, for example spunbonded fabric.

Insbesondere im Spinnvliesherstellungsprozess besteht aufgrund des Umstandes, dass dieser im Gegensatz zur Papierherstellung trocken abläuft, durch die Bewegung des Gewebebandes 10 auf den dieses führenden bzw. umlenkenden Walzen einerseits und durch die Relativbewegung zwischen dem hergestellten Spinnvlies und dem Gewebeband 10 andererseits, die Gefahr des Entstehens elektrostatischer Aufladungen. Um dies zu vermeiden, sind im Gewebeband 10 elektrisch leitende zweite Querfäden 14' vorgesehen. Beispielsweise kann pro Bindungsrapport R der Längsfäden 12 jeweils ein oder zumindest ein derartiger elektrisch leitender zweiten Querfaden 14' vorgesehen sein. Diese elektrisch leitenden zweiten Querfäden 14' können in einem Seitenrandbereich des Gewebebandes 10 in Kontakt mit einem auf Erdpotential liegenden elektrischen Kontakt sein, so dass das gesamte Gewebeband 10 auch auf Erdpotential ist und somit elektrostatische Aufladungen nicht entstehen können.In particular in the spunbonded nonwoven manufacturing process, due to the fact that it runs dry, in contrast to paper manufacture, the movement of the fabric belt 10 on the rollers guiding or deflecting it, on the one hand, and the relative movement between the spunbonded fabric produced and the fabric belt 10, on the other hand, creates the risk of developing electrostatic charges. In order to avoid this, electrically conductive second transverse threads 14 'are provided in the fabric band 10. For example, one or at least one such electrically conductive second transverse thread 14 ′ can be provided for each weave repeat R of the longitudinal threads 12. These electrically conductive second transverse threads 14 ′ can be in contact with an electrical contact that is at ground potential in a side edge region of the fabric band 10, so that the entire fabric band 10 is also at ground potential and thus electrostatic charges cannot arise.

Die elektrisch leitenden zweiten Querfäden 14' können ebenfalls aus Polymermaterial, beispielsweise aus einem Ein-Phasen-Polymermaterial, aufgebaut sein. Bei dem Ein-Phasen-Polymermaterial der elektrisch leitenden Querfäden (14') kann es sich bspw. um Polyamid (PA) handeln, in welches elektrisch leitende Partikel, wie z. B. Carbo-Nanotubes, eingebettet sind.The electrically conductive second transverse threads 14 'can also be constructed from polymer material, for example from a single-phase polymer material. The single-phase polymer material of the electrically conductive transverse threads (14 ') can be, for example, polyamide (PA), in which electrically conductive particles, such as. B. carbo-nanotubes are embedded.

Die elektrisch leitenden zweiten Querfäden 14' können in die Gewebestruktur des Gewebebandes 10 so eingebracht werden, wie auch die nicht elektrisch leitenden zweiten Querfäden 14, so dass eine von dieser leitenden Charakteristik unabhängige Gewebestruktur des Gewebebands 10 erreicht werden kann, beispielsweise mit den vorangehend bereits beschriebenen und in der Fig. 1 auch erkennbaren Flottierungen 16, 20 an der Bahnmaterialkontaktseite 18 bzw. der Maschinenkontaktseite 20. Durch das Bereitstellen dieser Gewebestruktur bzw. der Flottierungen, die an der Bahnmaterialkontaktseite 18 kürzer sind, als an der Maschinenkontaktseite 20, wird erreicht, dass ein größerer Anteil eines durch die Längsfäden 12 und die Querfäden 14, 14' bereitgestellten Gesamtfadenvolumens in einem der Bahnmaterialkontaktseite 18 näher liegenden Volumenbereich angeordnet ist. Beispielsweise kann in einem Gewebebanddickenbereich von 3/4 der Gewebebandgesamtdicke ausgehend von der Bahnmaterialkontaktseite 18 ein Anteil von 40 bis 50 %, vorzugsweise 54 bis 47 %, eines durch die Längsfäden 12 und die Querfäden 14, 14' bereitgestellten Gesamtfadenvolumens vorhanden sein. In einem Gewebebanddickenbereich von 1/4 der Gewebebandgesamtdicke ausgehend von der Bahnmaterialkontaktseite 18 können 30 bis 45 %, vorzugsweise 35 bis 40 %, des durch die Längsfäden 12 und die Querfäden 14, 14' bereitgestellten Gesamtfadenvolumens vorgesehen sein. Des Weiteren wird durch das Aneinanderschmiegen der Querfäden 14, 14' und der Längsfäden 12 bei Durchführung des Heißfixierungsprozesses erreicht, dass Hohlvolumenbereiche 24, die zur Bahnmaterialkontaktseite 18 und auch zur Maschinenkontaktseite 22 jeweils durch einen Faden, also einen Längsfaden 12 bzw. einen Querfaden 14, 14' überdeckt sind, nahezu nicht oder nur in einem Bereich von 0 bis 4 % des Gewebebandgesamtvolumens vorhanden sind. Dies hat zur Folge, dass Bereiche, in welche Verunreinigungspartikel eintreten können, praktisch nicht vorhanden sind.The electrically conductive second transverse threads 14 ′ can be introduced into the fabric structure of the fabric tape 10 in the same way as the non-electrically conductive second cross threads 14, so that a fabric structure of the fabric tape 10 that is independent of this conductive characteristic can be achieved, for example with those already described above and in the Fig. 1 also recognizable floats 16, 20 on the web material contact side 18 or on the machine contact side 20. By providing this fabric structure or the floats on the Web material contact side 18 are shorter than on machine contact side 20, so that a larger proportion of a total thread volume provided by longitudinal threads 12 and transverse threads 14, 14 'is arranged in a volume area closer to web material contact side 18. For example, a portion of 40 to 50%, preferably 54 to 47%, of a total thread volume provided by the longitudinal threads 12 and the transverse threads 14, 14 ′ can be present in a fabric tape thickness range of 3/4 of the total fabric tape thickness starting from the web material contact side 18. 30 to 45%, preferably 35 to 40%, of the total thread volume provided by the longitudinal threads 12 and the transverse threads 14, 14 'can be provided in a fabric tape thickness range of 1/4 of the total fabric tape thickness starting from the web material contact side 18. Furthermore, when the transverse threads 14, 14 'and the longitudinal threads 12 nestle against one another when the heat-setting process is carried out, hollow volume areas 24, which lead to the web material contact side 18 and also to the machine contact side 22, each have a thread, that is to say a longitudinal thread 12 or a transverse thread 14, 14 'are covered, are virtually non-existent or only present in a range of 0 to 4% of the total volume of the fabric tape. As a result, areas into which contamination particles can enter are practically non-existent.

Das erfindungsgemäß aufgebaute Gewebeband 10 eignet sich besonders zur Herstellung von Spinnvlies als Bahnenmaterial. Die Spinnvliesfäden werden im Herstellungsprozess in Spinnfliesfaden-Aufbringungsbereichen auf die Bahnmaterialkontaktseite 18 aufgebracht. Jeder derartige Spinnvliesfaden-Aufbringungsbereich kann eine Mehrzahl von in der Bandquerrichtung aufeinander folgenden Spinnvliesfaden-Extrusionsdüsen aufweisen, über welche die im Extrusionsprozess hergestellten Spinnvliesfäden dann auf die Bahnmaterialkontaktseite 18 des Gewebebandes 10 aufgebracht werden. Mehrere derartige Spinnvliesfaden-Aufbringungsbereiche können in der Bandlängsrichtung L aufeinander folgend angeordnet sein, so dass entsprechend auch mehrere Lagen von Spinnvliesfäden auf dem Gewebeband 10 abgelegt werden können und beispielsweise nachfolgend einem Kalandrierprozess unterzogen werden können, um die Struktur des Spinnvlieses zu verfestigen. Aufgrund des Vorsehens der elektrisch leitenden zweiten Querfäden 14' in der Gewebestruktur des Gewebebandes 10 wird das Entstehen von elektrostatischen Aufladungen, welche das Ablegen der Spinnvliesfäden auf der Bahnmaterialkontaktseite 18 ebenso wie das Abnehmen des Spinnvlieses vom Gewebeband 10 beeinträchtigen könnten, vermieden.The fabric tape 10 constructed according to the invention is particularly suitable for the production of spunbonded nonwoven as a web material. The spunbonded nonwoven threads are applied to the web material contact side 18 in the production process in spunbonded thread application areas. Each such spunbonded thread application area can have a plurality of spunbonded thread extrusion nozzles which follow one another in the transverse direction of the band and via which the spunbonded nonwoven threads produced in the extrusion process are then applied to the web material contact side 18 of the fabric band 10. Several such spunbonded thread application areas can be arranged in succession in the longitudinal direction L of the belt, so that accordingly also several layers of Spunbonded threads can be deposited on the fabric belt 10 and can subsequently be subjected to a calendering process, for example, in order to consolidate the structure of the spunbonded nonwoven. Due to the provision of the electrically conductive second transverse threads 14 ′ in the fabric structure of the fabric belt 10, the formation of electrostatic charges, which could impair the depositing of the spunbonded nonwoven threads on the web material contact side 18 and the removal of the spunbonded nonwoven fabric from the fabric belt 10, is avoided.

Die Figur 3 zeigt noch den Längsschnitt der Gewebestruktur des Gewebebands 10 der Figur 1 mit Kennzeichnung der verschiedenen Hohlraumvolumina.The Figure 3 shows the longitudinal section of the fabric structure of the fabric tape 10 of the Figure 1 with identification of the different cavity volumes.

In der Figur 3 ist das von der Bahnmaterialkontaktseite 18 her zugängliche Hohlraumvolumen durch die von links unten nach rechts oben schraffierten Bereiche gezeigt. Zum Erhalt des Hohlraumvolumens werden die in jeder Längsschnittebene erhaltenen Bereiche integriert. Das von der Bahnmaterialkontaktseite 18 her zugängliche Hohlraumvolumen kann gemäß einer vorteilhaften Ausgestaltung der Erfindung weniger als 0,45 mm3/mm2, bevorzugt 0,40 mm3/mm2 oder weniger sein. Wie aus der Darstellung der Figur 3 zu erkennen ist, Unter dem von der Bahnmaterialkontaktseite 18 her zugänglichen Hohlraumvolumen ist das Hohlraumvolumen zu verstehen, welches in einer senkrechten Projektion von der Bahnmaterialkontaktseite her zugänglich ist.In the Figure 3 the void volume accessible from the web material contact side 18 is shown by the areas shaded from bottom left to top right. To maintain the void volume, the areas obtained in each longitudinal section plane are integrated. The void volume accessible from the web material contact side 18 can, according to an advantageous embodiment of the invention, be less than 0.45 mm 3 / mm 2 , preferably 0.40 mm 3 / mm 2 or less. As from the representation of the Figure 3 It can be seen that the void volume accessible from the web material contact side 18 means the void volume that is accessible in a vertical projection from the web material contact side.

In der Figur 3 ist ferner das eingeschlossene Hohlraumvolumen zu erkennen, d.h. das Hohlraumvolumen das in senkrechter Projektion weder von der Bahnmaterialkontaktseite noch von der Maschinenkontaktseite her zugänglich ist. Das eingeschlossene Hohlraumvolumen ist in der Figur 3 durch die gepunkteten Bereiche dargestellt. Nach einer bevorzugten Ausgestaltung der Erfindung ist vorgesehen, dass das eingeschlossene Hohlraumvolumen, weniger als 0,65 mm3/mm2, bevorzugt weniger als 0,60 mm3/mm2 ist.In the Figure 3 the enclosed void volume can also be seen, ie the void volume that is not accessible in a vertical projection either from the web material contact side or from the machine contact side. The enclosed void volume is in the Figure 3 represented by the dotted areas. According to a preferred embodiment of the invention, it is provided that the enclosed cavity volume is less than 0.65 mm 3 / mm 2 , preferably less than 0.60 mm 3 / mm 2 .

Claims (18)

  1. Woven-fabric belt (10) whereon, when put to its intended use in a machine for production of spunbonded webs, such spunbonded webs are formed and transported, comprising a plurality of longitudinal threads (12), running substantially in a longitudinal belt direction (L), and a plurality of transverse threads (14, 14'), running substantially in a transverse belt direction and interlacing with the longitudinal threads (12), wherein the longitudinal and transverse threads are constructed substantially of a polymer material and a portion of the longitudinal and/or transverse threads (14') comprises electrically conducting material, wherein longitudinal threads (12) form, on the web material contact side (18), convex longitudinal thread knuckles having a crown (S1) and also the transverse threads include first transverse threads (14) which form, on the web material contact side (18), convex first transverse thread knuckles having a crown (S2), wherein the height difference (h) between the crowns (S1) of at least some of the convex longitudinal thread knuckles and the crowns (S2) of at least some of the first convex transverse thread knuckles on the web material contact side (18) is less than 220 µm, preferably less than 180 µm, more preferably less than 150 µm, characterized in that the material of the first transverse threads (14) is constructed using a two-phase polymer material, wherein a first polymer material phase of the two-phase polymer material has a higher melting temperature than a second polymer material phase of the two-phase polymer material, and wherein the longitudinal threads (12) are constructed using polymer material and the polymer material of the longitudinal threads (12) has a melting temperature above the melting temperature of the second polymer material phase.
  2. Woven-fabric belt (10) according to Claim 1, characterized in that the conditions for selecting the polymer material of the longitudinal threads (1) and that of the first transverse threads (14) and for heat-setting the woven-fabric belt (10) were such that the first transverse threads (14) were more deformed from their state before the heat-setting than the longitudinal threads (12) were deformed from their state before the heat-setting.
  3. Woven-fabric belt (10) according to Claim 1 or 2, characterized in that the woven-fabric belt (10) has been heat set, and in that the melting temperature of the first polymer material phase of the two-phase polymer material of the first transverse threads (14) and the melting temperature of the polymer material of the longitudinal threads (12) are above a maximum heat-setting temperature and the melting temperature of the second polymer material phase of the two-phase polymer material of the first transverse threads is not higher than the maximum heat-setting temperature.
  4. Woven-fabric belt (10) according to any one of Claims 1 to 3, characterized in that the melting temperature of the second polymer material phase is not less than 30°C below the melting temperature of the first polymer material phase or/and below the melting temperature of the polymer material of the longitudinal threads (12).
  5. Woven-fabric belt (10) according to any one of Claims 1 to 4, characterized in that the electrically conducting transverse threads (14') are second transverse threads (14') constructed using single-phase polymer material.
  6. Woven-fabric belt (10) according to any one of Claims 1 to 5, characterized in that the woven-fabric belt (10) when put to its intended use in the machine for production of spunbonded web is exposed to an operating temperature above room temperature, wherein the material of the first transverse threads (14) have softened at the operating temperature such that the adherence of the spunbonded web thereto is increased over the adherence at room temperature.
  7. Woven-fabric belt (10) according to Claim 6, characterized in that the proportion of first to second polymer material phase of the two-phase polymer material is selected such that the transverse threads (14) constructed of the two-phase polymer material have softened at the operating temperature such that the adherence of the spunbonded web thereto is increased over the adherence at room temperature.
  8. Woven-fabric belt (10) according to Claim 6 or 7, characterized in that, at the operating temperature, the material of the first transverse threads (14) softens more than the material of the longitudinal threads (12), so the adherence of the spunbonded web to the first transverse threads (14) is increased over the adherence of the spunbonded web to the longitudinal threads (12).
  9. Woven-fabric belt (10) according to any one of Claims 1 to 8, characterized in that the void volume accessible from the web material contact side (18) is less than 0.45 mm3/mm2, preferably 0.40 mm3/mm2 or less.
  10. Woven-fabric belt (10) according to any one of Claims 1 to 8, characterized in that the enclosed void volume, i.e., the void volume which is accessible neither from the web material contact side (18) nor from the machine contact side (22), is less than 0.65 mm3/mm2, preferably less than 0.60 mm3/mm2.
  11. Woven-fabric belt (10) according to any one of Claims 1 to 10, characterized in that there is no void volume connecting the web material contact side (18) to the machine contact side (22).
  12. Method of producing spunbonded web using a woven-fabric belt (10) according to any one of the preceding claims, which method comprises the step of applying spinbonding filaments to a web material contact side (18) of the woven-fabric belt (10), moving in a belt movement direction, in at least one spinbonding filament application region, preferably a plurality of successive, in the belt movement direction, spinbonding filament application regions, wherein every spinbonding filament application region serves to lay a spunbonded ply down on the woven-fabric belt (10).
  13. Method according to Claim 12, characterized in that every spinbonding filament application region comprises a multiplicity of successive, in the belt transverse direction, spinbonding filament extrusion dies for delivery of spinbonding filaments onto the web material contact side (18) of the woven-fabric belt (10).
  14. Method according to Claim 12 or 13, characterized in that the woven-fabric belt (10) moving in the belt movement direction is electrically contacted at one side edge region at least.
  15. Method according to any one of Claims 12 to 14, characterized in that each spunbonded ply has a basis weight of less than 15 grams per m2, preferably less than 10 grams per m2, especially a basis weight in the range from 1 to 15 grams per m2, preferably from 1 to 10 grams per m2, more preferably from 3 to 8 grams per m2.
  16. Method according to any one of Claims 12 to 15, characterized in that the woven-fabric belt (10) is maintained, at least in the spinbonding filament application region, at an operating temperature above room temperature, preferably at an operating temperature in the region of 35°C or up to 110°C, more preferably in the range from 45°C to 80°C.
  17. Method according to any one of Claims 12 to 16, characterized in that the woven-fabric belt (10) moves in the belt movement direction at a speed of 300 meters per minute or more, preferably at 350 to 1100 meters per minute, more preferably 600 to 1100 meters per minute.
  18. Woven-fabric belt (10) for production of web material, in a particular for use in a machine for production of spunbonded webs, comprising a plurality of longitudinal threads (12), running substantially in a longitudinal belt direction (L), and a plurality of transverse threads (14, 14'), running substantially in a transverse belt direction and interlacing with the longitudinal threads (12), wherein at least a portion of the transverse threads (14, 14') is constructed using electrically conducting material, wherein at least a portion of the transverse threads (14,14') is constructed using two-phase polymer material, wherein a first polymer material phase of the two-phase polymer material has a higher melting temperature than a second polymer material phase of the two-phase polymer material, and wherein the longitudinal threads (12) are constructed using polymer material and the polymer material of the longitudinal threads (12) has a melting temperature above the melting temperature of the second polymer material phase.
EP16701649.2A 2015-01-28 2016-01-27 Fabric tape for producing web material, in particular for producing spunbonded fabric Active EP3250739B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015201428.2A DE102015201428A1 (en) 2015-01-28 2015-01-28 Fabric tape for the production of web material, in particular for the production of spunbonded web
PCT/EP2016/051644 WO2016120300A1 (en) 2015-01-28 2016-01-27 Fabric tape for producing web material, in particular for producing spunbonded fabric

Publications (2)

Publication Number Publication Date
EP3250739A1 EP3250739A1 (en) 2017-12-06
EP3250739B1 true EP3250739B1 (en) 2020-06-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP16701649.2A Active EP3250739B1 (en) 2015-01-28 2016-01-27 Fabric tape for producing web material, in particular for producing spunbonded fabric

Country Status (4)

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US (1) US10907281B2 (en)
EP (1) EP3250739B1 (en)
DE (1) DE102015201428A1 (en)
WO (1) WO2016120300A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102015201428A1 (en) * 2015-01-28 2016-07-28 Voith Patent Gmbh Fabric tape for the production of web material, in particular for the production of spunbonded web
DE102018122221A1 (en) * 2018-09-12 2020-03-12 Voith Patent Gmbh Paper machine clothing

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US4636426A (en) * 1985-01-04 1987-01-13 Huyck Corporation Papermaker's fabric with yarns having multiple parallel monofilament strands
CA2142805C (en) 1994-04-12 1999-06-01 Greg Arthur Wendt Method of making soft tissue products
US6465074B1 (en) * 1999-08-25 2002-10-15 Albany International Corp. Base substrates for coated belts
US6790796B2 (en) * 2001-10-05 2004-09-14 Albany International Corp. Nonwovens forming or conveying fabrics with enhanced surface roughness and texture
RU2303665C2 (en) 2001-10-29 2007-07-27 Олбэни Интернэшнл Корп. Method for high-speed spinneret production of non-woven webs
US20030208886A1 (en) 2002-05-09 2003-11-13 Jean-Louis Monnerie Fabric comprising shaped conductive monofilament used in the production of non-woven fabrics
JP2004027407A (en) 2002-06-25 2004-01-29 Daiwabo Co Ltd Papermaking screen
KR101121186B1 (en) 2002-12-16 2012-03-23 알바니 인터내셔널 코포레이션 Hydroentangling using a fabric having flat filaments
DE202004009300U1 (en) 2004-05-19 2004-08-19 Wangner Gmbh & Co. Kg Dewatering belt for papermaking assembly has a gross-woven polymer gauze whose high points are flattened at high temperature and pressure
KR101114959B1 (en) 2004-05-19 2012-03-06 후이크 반그너 저머니 게엠베하 Forming Sieve for the Wet End Section of a Paper Machine
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Also Published As

Publication number Publication date
EP3250739A1 (en) 2017-12-06
US10907281B2 (en) 2021-02-02
DE102015201428A1 (en) 2016-07-28
US20180010267A1 (en) 2018-01-11
WO2016120300A1 (en) 2016-08-04

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