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EP4077789B1 - Procédé de fabrication de non-tissé - Google Patents

Procédé de fabrication de non-tissé Download PDF

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Publication number
EP4077789B1
EP4077789B1 EP20821214.2A EP20821214A EP4077789B1 EP 4077789 B1 EP4077789 B1 EP 4077789B1 EP 20821214 A EP20821214 A EP 20821214A EP 4077789 B1 EP4077789 B1 EP 4077789B1
Authority
EP
European Patent Office
Prior art keywords
spunbonded nonwoven
washing
conveying device
spunbonded
filaments
Prior art date
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Active
Application number
EP20821214.2A
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German (de)
English (en)
Other versions
EP4077789A1 (fr
Inventor
Ibrahim SAGERER-FORIC
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lenzing AG
Original Assignee
Lenzing AG
Chemiefaser Lenzing AG
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Publication date
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Publication of EP4077789A1 publication Critical patent/EP4077789A1/fr
Application granted granted Critical
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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/013—Regenerated cellulose series
    • 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
    • D04H3/02—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
    • D04H3/03—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 at random
    • 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
    • D04H3/10—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 yarns or filaments made mechanically
    • D04H3/11—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 yarns or filaments made mechanically by fluid jet
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • 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

Definitions

  • the present invention relates to a method for producing spunbonded nonwoven fabric, in which a spinning mass is extruded through the nozzle holes of at least one spinneret to form filaments, the filaments are stretched in the extrusion direction and deposited on a first conveyor device to form the spunbonded nonwoven fabric, and in which the spunbonded nonwoven fabric is subjected to at least one washing.
  • the state of the art includes the production of spunbonded nonwovens using the spunbond process and the meltblown process.
  • spunbond process e.g. GB 2 114 052 A or EP 3 088 585 A1
  • the filaments are extruded through a nozzle and drawn off and stretched by a stretching unit underneath.
  • meltblown process e.g. US 5,080,569 A , US 4,380,570 A or US 5,695,377 A
  • the extruded filaments are entrained and stretched by hot, fast process air as they exit the nozzle.
  • the filaments are laid down in a random position on a storage surface, such as a perforated conveyor belt, to form a nonwoven fabric, transported to post-processing steps and finally wound up as nonwoven rolls.
  • washing is generally not necessary, as the spinning process is so-called "dry", whereby any solvents used evaporate from the spunbonded nonwoven after the calender or dryer.
  • the spunbond is wound into rolls immediately after extrusion and depositing.
  • the throughput is usually limited by the length of the washing, as the spunbonds have to be washed out of the Solvents must reach certain residence times in the wash.
  • the US 2019/0264356 A1 refers to a process and an apparatus for producing cellulosic spunbonded webs which are directly formed from a lyocell spinning solution and in particular to the washing of directly formed cellulosic webs.
  • the water jet entanglement of the spunbonded nonwoven immediately after the filaments have been deposited results in the freshly extruded filaments being pressed and partially sucked into the drum under vacuum. This also makes it easier for the spunbonded nonwoven to be released from the drum. This makes it more difficult, which leads to further tears and defects in the spunbond.
  • the structural changes introduced into the spunbond during the hydroentanglement process are completely or partially removed by the subsequent coagulation baths and the associated swelling of the spunbond. This makes it much more difficult to specifically adjust the mechanical and structural properties of the spunbond produced.
  • the spunbond laid in loops can only be transported through the coagulation bath at low conveying speeds, as the buoyancy of the spunbond in the coagulation bath creates a great deal of resistance against the spunbond. An increase in throughput is therefore not possible without drastic losses in quality.
  • the invention therefore has the object of improving a process for producing spunbonded nonwoven fabric of the type mentioned at the outset in such a way that the throughput of the process can be increased in a cost-effective and simple manner without impairing the quality of the spunbonded nonwoven fabric.
  • the object is achieved in that the spunbonded fabric of the laundry is at least partially subjected to a perforated second conveyor device with a lower conveying speed than the first conveyor device, wherein the spunbonded fabric in the laundry is sprayed with washing liquid and the washing liquid is at least partially discharged through the perforated second conveyor device.
  • the spunbonded fabric is subjected to washing at least partially on a second conveyor system with a lower conveying speed than the first conveyor system, i.e. if the conveying speed of the spunbonded fabric during at least part of the washing is reduced compared to the conveying speed of the spunbonded fabric before washing, the residence time of the spunbonded fabric in the washing can be increased in a simple manner without providing for a costly longer washing.
  • a spunbonded fabric with a predefined basis weight can be obtained, whereby the quality of the spunbonded fabric obtained, in particular its residual solvent content after washing, is improved.
  • the conveying speed which, as shown above, results from the spinning mass throughput and the desired basis weight, can be completely decoupled from the conveying speed of the laundry. This allows the length of the laundry, the length of the system or the building and thus also the costs of setting up and operating a system to carry out the method to be significantly reduced.
  • the reliability and efficiency of the laundry process can be further improved.
  • the supported transport of the spunbond by the second conveyor system during washing can ensure reliable and efficient washing even at high conveying speeds, as there is no buoyancy or water resistance acting on the spunbond compared to washing in a bath.
  • Such buoyancy or water resistance in a laundry bath can lead to tangling or clumping in the spunbond at high conveying speeds, for example from 100 m/min to 500 m/min, and thus to the spunbond becoming unusable. This is particularly the case if the spunbond has a lower conveying speed during washing than before washing, as the lower conveying speed causes the spunbond to be too long in the laundry and the overly long spunbond can be reliably held on the second conveyor system by spraying it with washing liquid.
  • the spunbond By directly draining the washing liquid via the perforated second conveyor, the spunbond can be prevented from sagging and from swelling too much.
  • a spunbond completely soaked in washing liquid can absorb 10 to 15 times its own weight in liquid.
  • spunbonds that have never been dried have very low strength, such complete soaking of the spunbond leads to further structural weakening and thus to increased tears, which prevents reliable further transport.
  • the washing according to the invention can therefore increase the throughput of the process without negatively affecting the quality of the spunbond produced.
  • the spunbonded nonwoven fabric can have a liquid content of less than 5 kg/kg after washing, based on its dry weight.
  • the liquid content can be less than 4 kg/kg, or in yet another preferred embodiment, less than 3 kg/kg.
  • the low liquid content allows the internal structure and stability of the spunbonded nonwoven fabric to be retained, which means that transport remains possible even at high conveying speeds.
  • a spunbonded nonwoven fabric within the meaning of the present disclosure is understood to mean a nonwoven fabric which is formed directly by laying down extruded filaments, wherein the filaments are essentially continuous filaments and are laid down in a random position to form the spunbonded nonwoven fabric.
  • a conveying device in the sense of the present invention can be understood as all devices that are suitable for conveying or transporting the spunbonded fabric at a certain conveying speed.
  • a conveying device can be, for example, a conveyor belt, a conveyor drum, conveyor rollers or the like.
  • the conveying devices are designed as conveyor belts.
  • the conveying speed of the second conveyor is reduced by a factor of between 1 and 1000 compared to the first conveyor.
  • the throughput can be doubled with the same basis weight and the same length of the laundry, or the effectiveness of the laundry can be significantly improved.
  • doubling the residence time in the laundry increases efficiency in a superlinear manner and, for example, leads to a reduction in solvent residues in the finished spunbonded fabric by a factor of 4 to 8.
  • the conveying speed before the laundry is reduced by a factor of between 1 and 100, or particularly preferably by a factor of between 1 and 25.
  • the reproducibility of the process can also be further improved if the spunbond is laid down in loops on the second conveyor. This makes it particularly easy to react to the reduction in the conveyor speed during the wash.
  • the loops can essentially have parallel, superimposed sections on the spunbond, which enable the spunbond to be washed efficiently and can be pulled apart again after washing without damage. After washing, the loops can be pulled apart again using a faster conveyor.
  • the spunbonded fabric can preferably be deposited on the second conveyor immediately after the spunbonded fabric has been deposited and formed on the first conveyor.
  • "immediately after depositing” means that no further treatment steps of the spunbonded fabric on the first conveyor are provided between the depositing and formation of the spunbonded fabric on the first conveyor and the depositing on the second conveyor.
  • the spunbonded fabric can preferably be placed on the second conveyor before washing, particularly preferably immediately before washing. A reduction in the conveying speed of the spunbond therefore takes place before washing or immediately before washing.
  • "immediately before washing” means that no further treatment steps of the spunbond on the second conveyor are planned before washing.
  • the spunbond can therefore preferably run through the entire wash on the second conveyor.
  • the spunbonded fabric can undergo further treatment steps on a third conveyor device with a higher conveying speed than the second conveyor device.
  • the spunbonded fabric can be laid down on the third conveyor device, whereby - as previously described - the excess length of the spunbonded fabric or any loops formed in it can be unraveled again and the spunbonded fabric can be further treated again at a higher conveying speed.
  • the third conveyor device preferably has essentially the same conveying speed as the first conveyor device.
  • the conveying speed of the third conveyor is increased by a factor of between 1 and 1000 compared to the second conveyor, a particularly versatile process can be provided which allows direct further processing of the spunbond after washing at a higher conveying speed. In this way, the spunbond after washing can preferably be accelerated again to the same conveying speed as before washing and can undergo further treatment steps.
  • the conveying speed of the third conveyor is preferably increased by a factor of between 1 and 100 compared to the second conveyor, particularly preferably by a factor of between 1 and 25.
  • Hydroentanglement can preferably be carried out at the original conveying speed of the spunbonded nonwoven, since this does not require longer dwell times compared to washing.
  • hydroentanglement after washing allows for particularly reliable control of the structural and internal properties of the spunbond.
  • hydroentanglement can be used to permanently imprint patterns or perforations that remain in the finished spunbond.
  • the spunbonded nonwoven can be dried to obtain a finished spunbonded nonwoven.
  • the finished spunbonded nonwoven can then optionally be wound up into rolls in a winding device.
  • the efficiency of the laundry can be further improved if the laundry is a multi-stage countercurrent wash.
  • the washing liquid used for the laundry in particular water, circulates in several washing stages, with fresh washing liquid being added at the end of the laundry and discharged via the perforated second conveyor device and successively passed on to the upstream washing stages in the same way, and with the used washing liquid being discharged at the beginning of the laundry.
  • the throughput of the process can be further increased if, in addition, the spinning mass is extruded into filaments through at least a first spinneret and a second spinneret, wherein the filaments of the first spinneret are deposited on the first conveyor to form a first spunbonded fabric and the filaments of the second spinneret are deposited on the first conveyor to form a second spunbonded fabric, wherein the filaments of the second spinneret are deposited on the first conveyor to form the second spunbonded fabric above the first spunbonded fabric to obtain a multi-layer spunbonded fabric.
  • the throughput of the process can be increased in a simple manner, since at least two spinnerets are provided for the simultaneous formation of at least two spunbonded webs, but the multi-layer spunbonded web formed in this way can be further processed with the existing means instead of a single spunbonded web.
  • the second spinneret is preferably arranged downstream of the first spinneret in the conveying direction of the first conveyor device.
  • the multi-layer spunbonded fabric formed in this way consists of the first and second spunbonded fabric, with the second spunbonded fabric being arranged above the first.
  • the first and second spunbonded fabric can be connected to one another in such a way (for example by adhesion) that the multi-layer spunbonded fabric forms a unit that can undergo further process steps, but can be separated again into these essentially without structural damage to the first and second spunbonded fabrics.
  • the multi-layer spunbonded nonwoven is separated into at least the first and second spunbonded nonwoven in a subsequent step, at least two independent spunbonded nonwovens can be obtained again in the course of the process.
  • a cost-effective process for producing spunbonded nonwovens with increased throughput can thus be created.
  • the spinning mass can also be extruded into filaments through a third and further spinnerets and the filaments can be stretched in the extrusion direction, whereby the filaments of the third spinneret are deposited on the first conveyor device above the second spunbonded nonwoven to form a third spunbond in order to obtain the multi-layer spunbond, or the filaments of the further spinnerets are deposited on the first conveyor device above the preceding spunbond in order to obtain the multi-layer spunbond.
  • Such a multilayer spunbonded fabric can comprise a large number of spunbonded fabrics, which can be separated from one another again in a later process step.
  • the multi-layer spunbonded nonwoven is subjected to at least one treatment step before it is separated into at least the first and second spunbonded nonwoven.
  • the first and second spunbonded nonwoven can be treated together in the form of the multi-layer spunbonded nonwoven, thus significantly increasing the throughput of the process compared to separate treatment of the spunbonded nonwovens.
  • the at least one treatment step of the multi-layer spunbonded nonwoven is the washing according to the invention on the second conveyor device with a reduced conveying speed compared to the first conveyor device.
  • the method according to the invention with joint washing of the first and second spunbonded nonwoven in the multi-layer spunbonded nonwoven can significantly reduce the length of the washing or increase the throughput.
  • the method according to the invention can be characterized by high flexibility if the spunbond is a multi-layer spunbond, with at least two spinnerets arranged one behind the other being provided, so that the filaments extruded from the respective spinnerets each form a spunbond layer, which are laid on top of each other in such a way that the multi-layer spunbond is produced.
  • the multi-layer spunbond can then nevertheless can be reliably washed using the method according to the invention at a reduced conveying speed.
  • the reliability of the process can be further increased if the filaments are stretched using a stretching air stream after they have been extruded from the spinneret. This allows the extrusion and stretching conditions of the filaments to be controlled in a targeted manner and thus the internal properties of the spunbonded fabric to be adjusted.
  • the stretching air stream is directed from the respective spinneret onto the extruded filaments.
  • the stretching air stream can have a pressure of 0.05 bar to 5 bar, preferably 0.1 bar to 3 bar, particularly preferably 0.2 bar to 1 bar.
  • the stretching air stream can further have a temperature of 20 °C to 200 °C, preferably from 60 °C to 160 °C, particularly preferably from 80 °C to 140 °C.
  • the process according to the invention can be particularly suitable for the production of cellulosic spunbonded nonwovens, wherein the spinning mass is a lyocell spinning mass, i.e. a solution of cellulose in a direct solvent for cellulose.
  • Such a direct solvent for cellulose is a solvent in which the cellulose is dissolved in non-derivatized form.
  • This can preferably be a mixture of a tertiary amine oxide, such as NMMO (N-methylmorpholine-N-oxide), and water.
  • NMMO N-methylmorpholine-N-oxide
  • ionic liquids or mixtures with water are also suitable as direct solvents.
  • the content of cellulose in the spinning mass can be 3 wt.% to 17 wt.%, in preferred embodiments 5 wt.% to 15 wt.%, and in particularly preferred embodiments 6 wt.% to 14 wt.%.
  • the process according to the invention results in numerous improvements and advantages with regard to the economic efficiency of the production plant, the operation of the plant and product quality. Since several loops offset in parallel can be washed at the same time, the conveying speed of the spunbonded fabric can be significantly reduced during washing. The lower conveying speed reduces both the costs and the complexity of the production plant.
  • the spunbonded nonwoven fabric deposited in parallel loops at a reduced conveying speed can be washed with greater efficiency. than a spunbond with a higher and not reduced conveying speed. Even after a multi-stage countercurrent wash, the loops can be dissolved again without being damaged and the spunbond can be accelerated back to the original conveying speed.
  • the throughput of cellulose per spinneret can preferably be between 5 kg/h per meter of spinneret length and 500 kg/h per meter of spinneret length.
  • the basis weight of the spunbonded nonwoven is between 5 g/m 2 (gsm) and 500 g/m 2 , preferably 10 g/m 2 to 250 g/m 2 , particularly preferably 15 g/m 2 to 100 g/m 2 .
  • the conveying speed of the spunbonded fabric during deposition or the conveying speed of the first conveying device can preferably be between 1 m/min and 2000 m/min, preferably 10 m/min to 1000 m/min, particularly preferably 15 m/min to 500 m/min.
  • the internal structure of the spunbonded nonwoven fabric can also be reliably controlled if the filaments extruded and stretched from the spinneret are partially coagulated.
  • a coagulation air stream containing a coagulation liquid can be assigned to the spinneret for at least partial coagulation of the filaments, whereby the internal structure of the spunbonded fabric can be controlled in a targeted manner.
  • a coagulation air stream can preferably be a fluid containing water and/or coagulant, e.g. gas, mist, steam, etc.
  • the coagulation liquid is a mixture of water and a direct solvent for cellulose.
  • the coagulation liquid can be a mixture of demineralized water and 0 wt.% to 40 wt.% NMMO, preferably 10 wt.% to 30 wt.% NMMO, particularly preferably 15 wt.% to 25 wt.% NMMO.
  • the amount of coagulation liquid can preferably be 50 l/h to 10,000 l/h, more preferably 100 l/h to 5,000 l/h, particularly preferably 500 l/h to 2,500 l/h per meter of coagulation nozzle.
  • the spinnerets of the method according to the invention or the device according to the invention can preferably be known from the prior art ( US 3,825,380 A , US 4,380,570 A , WO 2019/068764 A1 ) single-row slot nozzles, multi-row needle nozzles or preferably column nozzles with lengths of 0.1 m to 6 m are used.
  • Fig.1 shows a schematic representation of the method and a device according to a first embodiment.
  • Fig.1 shows a schematic representation of the method 100 according to a first embodiment for producing cellulosic spunbond 1 and a corresponding device 200 by means of which the method 100 is carried out.
  • a spinning mass 2 is produced from a cellulosic raw material and fed to a spinneret 3 of the device 200.
  • the cellulosic raw material for producing the spinning mass 2 which is not shown in more detail in the figures, can be a conventional pulp made from wood or other plant-based raw materials. However, it is also conceivable that the cellulosic raw material consists of production waste from spunbond production or recycled textiles.
  • the spinning mass 2 is a solution of cellulose in NMMO and water, the cellulose content in the spinning mass 2 being between 3% by weight and 17% by weight.
  • the spinning mass 2 is then extruded in the spinneret 3 through a plurality of nozzle holes 4 to form the filaments 5.
  • the filaments 5 are stretched as they exit the spinneret 3 by means of a stretching air stream.
  • the stretching air 6 can exit from openings in the spinneret 3 between the nozzle holes 4 and be directed as a stretching air stream directly onto the extruded filaments 5, which is not shown in more detail in the figures.
  • the extruded filaments 5 are exposed to a coagulation air stream 7 after or during stretching, which is generated by a coagulation device 8.
  • the coagulation air stream 7 usually contains a coagulation liquid, for example in the form of steam, mist, etc.
  • the filaments 5 are at least partially coagulated, which in particular reduces adhesions between the individual extruded filaments 5.
  • the stretched and at least partially precipitated filaments 5 are then laid down in a random position on a first conveyor belt 9 as the first conveyor device 9 to form the spunbonded nonwoven 1.
  • the spunbonded nonwoven 1 is then transported further to further processing steps 10, 11, 12 with the conveyor belt 9.
  • the spunbonded nonwoven 1 is then subjected to at least one washing 10.
  • the spunbonded fabric 1 is deposited immediately in front of the laundry 10 on a second conveyor belt 13 as a second conveyor device 13, which has a reduced conveying speed compared to the first conveyor device 9.
  • the conveying speed of the spunbonded fabric 1 within the laundry 10 is therefore reduced compared to the conveying speed of the spunbonded fabric 1 before the laundry 10, i.e. while the filaments 5 are being deposited on the first conveyor belt 9.
  • the conveying speed is preferably reduced by a factor of between 1 and 1000. In a further embodiment, the factor is between 1 and 100, and in yet another embodiment, between 1 and 25.
  • the spunbonded fabric 1 is deposited in loops 14 on the second conveyor belt 13.
  • the spunbonded nonwoven fabric 1 laid in loops 14 is then subjected to washing 10, in which it is essentially freed from solvent residues from the spinning mass 2.
  • the spunbonded fabric 1 is placed on a third conveyor belt 15, which has a higher conveying speed than the second conveyor belt 13.
  • the third conveyor belt 15 preferably has the same conveying speed as the first conveyor belt 9, whereby the loops 14 are completely pulled out again.
  • the third conveyor belt 15 can also have a different conveying speed than the first conveyor belt 9, which is increased compared to the second conveyor belt 13 by a factor of between 1 and 1000, preferably between 1 and 100, particularly preferably between 1 and 25.
  • the spunbonded fabric 1 is subjected to a hydroentanglement 11, which can further adapt the internal structure of the spunbonded fabric 1.
  • additional perforation patterns, embossed patterns or the like can be introduced into the spunbonded nonwoven fabric 1, although this is not shown in more detail in the figures.
  • spunbonded nonwoven fabric 1 is subjected to drying 12 to obtain a finished spunbonded nonwoven fabric 1, wherein the process 100 is completed by optional winding 16 and/or packaging.
  • the device 100 or the method 200 can have at least a first spinneret 3 and a second spinneret 30, wherein the spinning mass 2 is simultaneously extruded through the first spinneret 3 and the second spinneret 30 to form the filaments 5, 50.
  • the filaments 5, 50 are each stretched in the extrusion direction and at least partially coagulated, wherein the filaments 5 of the first spinneret 3 are deposited on the conveyor belt 9 to form a first spunbonded nonwoven 1 and the filaments 50 of the second spinneret 30 are deposited on the conveyor belt 9 to form a second spunbonded nonwoven.
  • the filaments 50 of the second spinneret 30 are deposited on the conveyor belt 9 over the first spunbonded web 1 to form the second spunbonded web in order to obtain a multi-layer spunbonded web, which is not shown in detail in the figures.
  • the first spunbond 1 and the second spunbond pass through the laundry 10 together in the form of the multi-layer spunbond, with the multi-layer spunbond being laid in loops 14 on the second conveyor belt 13 at a lower conveying speed than the first conveyor belt 9.
  • the multi-layer spunbond can then be separated again into at least the first spunbond 1 and second spunbond in a step following the laundry 10, with the first spunbond 1 and second spunbond separately passing through further steps after separation, such as hydroentanglement 11 and/or drying 12.
  • first spunbonded nonwoven 1 and the second spunbonded nonwoven can also undergo the hydroentanglement 11 together and be permanently bonded together to form the multi-layer spunbonded nonwoven.
  • first spunbonded nonwoven 1 and the second spunbonded nonwoven can each have different internal properties, for example a different basis weight, and thus form a multi-layer spunbonded nonwoven with properties that vary in the cross-section.
  • the first conveyor device 9 is a conveyor drum and the second conveyor device 13 is a conveyor belt.
  • both the first conveyor device 9 and the second conveyor device 13 are a conveyor drum.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Cleaning Implements For Floors, Carpets, Furniture, Walls, And The Like (AREA)

Claims (15)

  1. Procédé de fabrication de non-tissé (1), selon lequel une masse à filer (2) est extrudée à travers les trous de buse (4) d'au moins une buse de filage (3, 30) pour créer des filaments (5, 50), lesquels filaments (5, 50) sont étirés dans la direction d'extrusion et, pour former le non-tissé (1), déposés sur un premier dispositif de transport (9), et selon lequel le non-tissé (1) est soumis à au moins un lavage (10), caractérisé en ce que le non-tissé (1) est soumis au lavage (10) au moins partiellement sur un deuxième dispositif de transport perforé (13) doté d'une vitesse de transport inférieure à celle du premier dispositif de transport (9), le non-tissé (1) étant aspergé avec du liquide de lavage lors du lavage (10) et ce liquide de lavage étant évacué au moins partiellement à travers le deuxième dispositif de transport perforé (13).
  2. Procédé selon la revendication 1, caractérisé en ce que la vitesse de transport du deuxième dispositif de transport (13) par rapport au premier dispositif de transport (9) est réduite d'un facteur de 1 à 1000, en particulier d'un facteur de 1 à 100 et de façon particulièrement préférée d'un facteur de 1 à 25.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le non-tissé (1) est déposé en boucles (14) sur le deuxième dispositif de transport (13).
  4. Procédé selon une des revendications 1 à 3, caractérisé en ce qu'après le lavage (10), le non-tissé (1) est soumis à d'autres étapes de traitement (11, 12) sur un troisième dispositif de transport (15) doté d'une vitesse de transport supérieure à celle du deuxième dispositif de transport (13).
  5. Procédé selon la revendication 4, caractérisé en ce que la vitesse de transport du troisième dispositif de transport (15) par rapport au deuxième dispositif de transport (13) est accrue d'un facteur de 1 à 1000, en particulier d'un facteur de 1 à 100 et de façon particulièrement préférée d'un facteur de 1 à 25.
  6. Procédé selon la revendication 4 ou 5, caractérisé en ce que le troisième dispositif de transport (15) présente sensiblement la même vitesse de transport que le premier dispositif de transport (9).
  7. Procédé selon une des revendications 1 à 6, caractérisé en ce qu'après le lavage (10), le non-tissé (1) est soumis à une consolidation par jets d'eau (11) et/ou à un séchage (12).
  8. Procédé selon une des revendications 1 à 7, caractérisé en ce que le lavage (10) est un lavage à contre-courant en plusieurs étapes.
  9. Procédé selon une des revendications 1 à 8, caractérisé en ce que le non-tissé (1) est déposé sur le deuxième dispositif de transport (13) immédiatement après la déposition et la formation sur le premier dispositif de transport (9).
  10. Procédé selon une des revendications 1 à 9, caractérisé en ce que le non-tissé (1) est déposé sur le deuxième dispositif de transport (13) immédiatement avant le lavage (10).
  11. Procédé selon une des revendications 1 à 10, caractérisé en ce que la masse à filer (2) est extrudée à travers au moins une première buse de filage (3) et une deuxième buse de filage (30) pour créer des filaments (5, 50), les filaments (5) de la première buse de filage (3) étant déposés sur le premier dispositif de transport (9) pour former un premier non-tissé (1) et les filaments (50) de la deuxième buse de filage (30) étant déposés sur le premier dispositif de transport (9) pour former un deuxième non-tissé, et les filaments (50) de la deuxième buse de filage (30) étant déposés sur le premier dispositif de transport (9) par-dessus le premier non-tissé (1) pour former le deuxième non-tissé afin d'obtenir un non-tissé multicouche.
  12. Procédé selon la revendication 11, caractérisé en ce que, dans une étape suivante, en particulier après le lavage (10), le non-tissé multicouche est séparé en au moins le premier non-tissé (1) et le deuxième non-tissé.
  13. Procédé selon une des revendications 1 à 12, caractérisé en ce que le non-tissé (1) est un non-tissé cellulosique (1) et la masse à filer (2) une solution de cellulose dans un solvant direct, en particulier un amine-oxyde tertiaire.
  14. Procédé selon une des revendications 1 à 13, caractérisé en ce que les filaments (5, 50) sont au moins partiellement coagulés après l'extrusion de la buse de filage (3, 30), en particulier un flux d'air de coagulation (7) comportant un liquide de coagulation étant associé à la buse de filage (3, 30) pour provoquer la coagulation au moins partielle des filaments (5, 50).
  15. Procédé selon une des revendications 1 à 14, caractérisé en ce que le liquide de coagulation est un mélange d'eau et du solvant direct pour la cellulose, en particulier d'un amine-oxyde tertiaire.
EP20821214.2A 2019-12-17 2020-12-11 Procédé de fabrication de non-tissé Active EP4077789B1 (fr)

Applications Claiming Priority (2)

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EP19217037 2019-12-17
PCT/EP2020/085773 WO2021122379A1 (fr) 2019-12-17 2020-12-11 Procédé de production de non-tissé filé-lié

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EP (1) EP4077789B1 (fr)
JP (1) JP7691426B2 (fr)
KR (1) KR20220111706A (fr)
CN (1) CN114787440B (fr)
BR (1) BR112022011701A2 (fr)
ES (1) ES2987702T3 (fr)
FI (1) FI4077789T3 (fr)
PT (1) PT4077789T (fr)
TW (1) TW202140884A (fr)
WO (1) WO2021122379A1 (fr)

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US5080569A (en) 1990-08-29 1992-01-14 Chicopee Primary air system for a melt blown die apparatus
US6306334B1 (en) 1996-08-23 2001-10-23 The Weyerhaeuser Company Process for melt blowing continuous lyocell fibers
US5695377A (en) 1996-10-29 1997-12-09 Kimberly-Clark Worldwide, Inc. Nonwoven fabrics having improved fiber twisting and crimping
GB9625634D0 (en) 1996-12-10 1997-01-29 Courtaulds Fibres Holdings Ltd Method of manufacture of nonwoven fabric
DE10023391A1 (de) 2000-05-12 2001-03-15 Lurgi Zimmer Ag Verfahren und Vorrichtung zur zugspannungsfreien Förderung von Endlosformkörpern
US20050056956A1 (en) 2003-09-16 2005-03-17 Biax Fiberfilm Corporation Process for forming micro-fiber cellulosic nonwoven webs from a cellulose solution by melt blown technology and the products made thereby
DE102004007618A1 (de) * 2004-02-17 2005-09-22 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zur Herstellung von Vliesstoffen, Vliesstoff und dessen Verwendung
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DE102017129300A1 (de) * 2017-12-08 2019-06-13 Trützschler GmbH & Co Kommanditgesellschaft Anlage und Verfahren zur Erzeugung eines Spinnvlieses

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ES2987702T3 (es) 2024-11-15
FI4077789T3 (fi) 2024-09-05
BR112022011701A2 (pt) 2022-09-06
PT4077789T (pt) 2024-08-14
WO2021122379A1 (fr) 2021-06-24
JP2023506903A (ja) 2023-02-20
TW202140884A (zh) 2021-11-01
EP4077789A1 (fr) 2022-10-26
CN114787440A (zh) 2022-07-22
JP7691426B2 (ja) 2025-06-11
US20230020186A1 (en) 2023-01-19
KR20220111706A (ko) 2022-08-09
CN114787440B (zh) 2023-09-12

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