EP1633912B1 - Verfahren und faserverteiler für trockenvliesbildung - Google Patents

Verfahren und faserverteiler für trockenvliesbildung Download PDF

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Publication number
EP1633912B1
EP1633912B1 EP04734995.6A EP04734995A EP1633912B1 EP 1633912 B1 EP1633912 B1 EP 1633912B1 EP 04734995 A EP04734995 A EP 04734995A EP 1633912 B1 EP1633912 B1 EP 1633912B1
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EP
European Patent Office
Prior art keywords
wings
fibres
nits
sec
optimal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP04734995.6A
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English (en)
French (fr)
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EP1633912A1 (de
Inventor
Jens Ole Bröchner ANDERSEN
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.)
Oerlikon Textile GmbH and Co KG
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Oerlikon Textile GmbH and Co KG
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Priority to PL04734995T priority Critical patent/PL1633912T3/pl
Publication of EP1633912A1 publication Critical patent/EP1633912A1/de
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Publication of EP1633912B1 publication Critical patent/EP1633912B1/de
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • D04H1/732—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by fluid current, e.g. air-lay
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/425—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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged

Definitions

  • the invention relates to a method according to claim 1; and a fibre distributor according to claim 7 for air-laying fibres on an endless, air pervious forming wire in a plant for producing non-woven webs for e.g.,
  • the fluff which is usually employed for products of this nature, is fluff of relatively short cellulose fibres, of relatively long synthetic fibres, or of a blend of such fibres.
  • Other materials like e.g. SAP (Super Absorbent Powder) can be mixed into the fluff.
  • the fibre distributor comprises a forming head, which is placed above the forming wire and has a perforated bottom and at least one row of rotateable wings situated at a distance above said bottom.
  • the fibres supplied to the forming head are, during production, swept along by rows of wings in an air stream in order to be evenly distributed over the bottom.
  • the relatively long synthetic fibres are especially inclined to form nits with other similar or differing types of fibres while being swept along in the air stream by the rows of wings in the fibre distributor.
  • Nits are small tangled bundles of fibres, which can be quite hard and difficult to open even when they are recirculated back to e.g. a hammer mill.
  • the nits contribute neither to the volume, the quality, nor the strength of the non-woven webs. The generation of nits during production of the webs should therefore be kept to as low a level as possible.
  • the plants should be operated with as high a velocity of the air stream along the rows of wings as possible.
  • the velocity should, on the other hand, also be very low in order to keep the contents of fibres per unit of area of the finished non-woven web, which are reduced to nits, to as low a level as possible.
  • a fibre distributor of the kind named in the preamble which during operation generates fewer nits than hitherto known.
  • a fibre distributor of the kind named in the preamble which during operation generates fewer nits than hitherto known and at a higher rate of production than hitherto known.
  • a fibre distributor of the kind named in the preamble which is arranged to, during operation, regulate the process in such a manner that a minimum of nits are generated.
  • a fifth aspect of the invention is provided a method of the kind named in the preamble by which it is possible to obtain a higher production capacity of a fibre distributor than hitherto known.
  • a sixth aspect of the invention is provided a method of the kind named in the preamble by which it is possible to operate a fibre distributor such that lesser nits than hitherto known are generated.
  • a seventh aspect of the invention is provided a method of the kind named in the preamble by which lesser nits than hitherto known are generated at a higher rate of production than hitherto known.
  • an eighth aspect of the invention is provided a method of the kind named in the preamble by which the process can be regulated in such a manner that a minimum of nits are generated.
  • the fibre distributor is, according to the invention, arranged for regulating the speed of rotation of the wings into an interval of speeds around an optimal speed where the fibres inclination to form nits changes from being lesser to being larger when increasing the rotation speed of the wings.
  • Said optimal speed of rotation of the wings can in practise vary depending on the prevailing conditions of the fibre structure and fibre composition and also of the production parameters of the fibre distributor.
  • the fibre distributor could therefore be arranged to regulate the speed of rotation of the wings into an interval of speeds of rotation, which could include speeds, which by certain conditions are not completely optimal.
  • This interval can be around an average speed of rotation and the regulation can be carried out in agreement only with the composition of the fibres and the arrangement of the actual fibre distributor. That means that the speed of rotation of the wings doesn't need to be optimal all the time, since the optimal speed can vary as explained above.
  • the speed of rotation of the wings can, in another embodiment according to the invention, be optimal all the time by continually regulating the speed to the speed, which at a given moment is optimal. Thereby it advantageously is obtained that the loss of fibres due to the formation of nits, is as low as possible.
  • This embodiment comprises the steps of detecting the amount of nits per unit of area of the fibre layer on the forming wire or in the resulting non-woven web; sending signals representing the results of the detecting as input to a computer; using this input to calculate, by means of a program in the computer, a value which represents an optimal rotation speed where the number of nits at a given moment are small or smallest; and sending signals representing this value as output from the computer to order the wings to rotate with rotating speeds represented by said value.
  • the fibre distributor according to the invention has in this way been self-regulating and will therefore, during operation, automatically produce non-woven webs with a minimum of loss of fibres and at the same time also with an extremely high rate of production.
  • the fibre distributor 1 comprises a forming head 2 with an inlet 3 for the cellulose fibres 4 and another inlet 5 for the synthetic fibres 6. These inlets 3,5 admit the respective fibres 4,6 to enter the forming head in air streams in the direction of the arrows shown.
  • the forming head has a perforated bottom 7 with openings 8. Below the bottom is arranged an endless, air pervious forming wire 9 running, during production, over rolls 10 in the direction shown by the arrow. Only part of said forming wire is shown in fig. 1 and 2 .
  • the wings are, during operation of the fibre distributor, rotated with such a speed of rotation that the supplied fibres are swept along the rows of wings in a first air stream, which is generated by the rotating wings, thereby distributing the fibres all over the bottom as illustrated in fig. 2 with the arrows.
  • the fibres in the first air stream are, by means of the suction box and the evacuating pump, successively sucked down through the openings 8 in the perforated bottom 7 entrained in the generated second air stream, thereby depositing the fibres in a layer 16 on the upper part 17 of the forming wire.
  • the forming wire transports this layer into the direction of the arrow for being further treated in the subsequent parts of the associated plant (not shown) in such a way that the desired non-woven web is formed.
  • the synthetic fibres 6 are usually supplied as staple fibres, while the cellulose fibres 4 are supplied in the form of a fibre roll (not shown), which is defibrated to fluff by a hammer mill (not shown).
  • Fig. 3 illustrates schematically in a larger scale a fragment of a non-woven web 18, which contains synthetic fibres 6 and cellulose fibres 4. As it appears from the figure are the cellulose fibres formed with protuberances 19.
  • the non-woven web also contains cellulose nits 20 consisting alone of cellulose fibres and compound nits 21 consisting of both cellulose fibres 4 and synthetics fibres 6.
  • the cellulose fibres 20 act as a kind of nucleus for forming the compound nits 21.
  • the protuberances 19 play an important part in this connection in that they are capable of catching the synthetic fibres.
  • the nits show a tendency to grow during the air-laying process. Having attained a certain size, the nits then tend to split up into two or more nits, which then acts as new nucleuses for forming still more nits.
  • the figure shows with full line the number of nits pr. m 2 (n/m 2 ) in the finished web as function of the velocity v (m/sec) of the first air stream, which is the air stream generated by the wings for sweeping the fibres along the perforated bottom of the forming head. Only nits having a sectional size larger than 1 mm 2 are counted in this example.
  • the web produced in the example had a weight of 0,120 kg/m 2 and was composed of 80% cellulose fibres and 20% synthetic fibres.
  • the average length of the cellulose fibres was about 2 mm, while the average length of the synthetic fibres was about 6 mm.
  • the wings in a row were, as illustrated with the arrows in fig. 2 , rotated in the same direction while the wings in two adjacent rows were rotated in opposite directions, whereby the fibres were swept along the perforated bottom and evenly dispersed over the area of this.
  • the perforated bottom was of the type described in the applicant's patent application WO 99/54537 , "a sifting net for a fibre distributor".
  • the mesh size of the net was 4.
  • the above-mentioned specifications are common for non-woven webs used for e.g. incontinence articles and also for existing production plants.
  • the normal velocity of the first air stream used for producing said non-woven web was 3 m/sec. At this velocity the number of nits pr. m 2 was found to be 500 n/m with an output per wing per hour of 12 kg/w/h.
  • the wings rotated with such a rotation speed that the velocity of the first air stream is between 9 m/sec and 16 m/sec and especially between 11 m/sec and 14 m/sec.
  • Fig. 4 also shows that the contents of nits in the finished non-woven web increases from 67 n/m 2 at a velocity of 1,0 m/sec up to a maximum of 583 n/m 2 at a velocity of 4,4 m/sec. After that the nits contents decreases to a minimum of 60 n/m 2 at a velocity of 12,7 m/sec for thereafter to increase again.
  • the fibre distributor therefore is equipped with a regulator for regulating the velocity of the first air stream in an interval around an average optimal velocity.
  • Said interval has according to the invention a size between 0.5 and 1.5, preferentially between 0.75 and 1.25 and especially between 0.9 and 1.1 times the rotation speed of the wings generating said average optimal velocity.
  • the regulating of the velocity of the first air stream can advantageously be performed automatically by means of a controlling system according to the invention, which schematically is illustrated by means of the block diagram shown in fig. 5 .
  • the detector is, as seen in fig. 1 , placed downstream the forming head and above the fluff on the forming wire and it can be of any suitable type, for example a digital photo detector, a laser detector or an ultrasound detector.
  • the result of the detecting is constantly sent as input to the computer, which also receives input (not shown) for the simultaneous supplying of the different fibres to the forming head.
  • the computer is also adapted to regulate other actuators, e.g. the actuators 25, 26, 27, 28 and 29 in correspondence with the regulating of the velocity of the first air stream.
  • the fibre distributor in the above-described way self-regulating and will therefore, during operation, automatically produce non-woven webs with a minimum of fibre loss in form of nits and at the same time also with an extremely high rate of production.
  • the plant is also very easy to start up and operate.

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

Claims (12)

  1. Verfahren zum Luftlegen von Fasern (4, 6) auf einem endlosen, luftdurchlässigen Formdraht (9), mit den Schritten:
    - Zuführen von Fasern (4, 6) zu einem Formkopf (2) mit einem perforierten Boden (7) und mindestens einer Reihe (14) drehbarer Flügel (15), die sich in einem Abstand oberhalb des Bodens (7) befinden,
    - Auskehren der Fasern (4, 6) entlang der mindestens einen Reihe (14) der Flügel (15) mit einem ersten Luftstrom durch Drehen der Flügel (15), wobei währenddessen die Fasern (4, 6) die Neigung erhalten, Nissen (20, 21) zu bilden,
    - Regulieren der Drehgeschwindigkeit der Flügel (15) in einem Intervall um eine optimale Geschwindigkeit, bei der sich die Neigung der Faser (4, 6), Nissen zu bilden (20, 21), von geringer zu größer ändert, wenn die Drehgeschwindigkeit der Flügel (15) zunimmt, und
    - aufeinanderfolgendes Abscheiden der Fasern (4, 6) in einer Schicht (16) auf dem oberen Teil (17) des Formdrahts (9) durch Saugen der Fasern (4, 6) nach unten durch die Öffnungen (8) in dem perforierten Boden (7) in einen zweiten Luftstrom.
  2. Verfahren nach Anspruch 1, den Schritt des Regulierens der Drehgeschwindigkeiten der Flügel (15) in Übereinstimmung mit der Zusammensetzung der Fasern (4, 6) aufweisend.
  3. Verfahren nach Anspruch 1 oder 2, den Schritt des Wählens eines Intervalls der Drehgeschwindigkeiten der Flügel (15) um eine mittlere optimale Drehzahl aufweisend, bei dem die Anzahl der Nissen (20, 21) klein oder am kleinsten ist, mit einer Größe zwischen dem 0,5- und 1,5-fachen, bevorzugt zwischen dem 0,75- und dem 1,25-fachen und speziell zwischen dem 0,9- und dem 1,1-fachen der optimalen optimale Drehgeschwindigkeit der Flügel (15).
  4. Verfahren nach Anspruch 1, die Schritte aufweisend:
    - Erfassen des Prozentsatzes der Nissen (20, 21) in der Faserschicht (16) auf dem Formdraht (9) oder in der sich ergebenden Vliesbahn (18),
    - Senden von Signalen, die die Ergebnisse des Erfassens darstellen, als Eingabe an einen Computer (23),
    - Verwenden dieser Eingabe zum Berechnen eines Werts mittels eines Programms des Computers, wobei der Wert eine optimale Drehzahl darstellt, an der die Anzahl der Nissen (20, 21) zu einem bestimmten Zeitpunkt klein oder am kleinsten ist, und
    - Senden von Signalen, die diesen Wert als Ausgabe vom Computer (23) darstellen, um die Flügel (15) mit Drehgeschwindigkeiten zu drehen, die durch diesen Wert dargestellt sind.
  5. Verfahren nach einem der Ansprüche 1 - 4, mit Drehen der Flügel mit einer solchen Drehgeschwindigkeit, dass die Fasern entlang des Bodens mit einer Geschwindigkeit zwischen 5 m/s und 26 m/s ausgekehrt werden, vorzugsweise zwischen 8 m/s und 17 m/s und speziell zwischen 10 m/s und 15 m/s.
  6. Verfahren nach einem der Ansprüche 1 - 4, mit Drehen der Flügel mit einer solchen Drehgeschwindigkeit, dass die Fasern entlang des Bodens mit einer Geschwindigkeit zwischen 9 m/s und 16 m/s ausgekehrt werden, insbesondere zwischen 11 m/s und 14 m/s.
  7. Faserverteiler der zum Luftlegen von Fasern (4, 6) auf einem endlosen, luftdurchlässigen Formdraht (9) in einer Anlage zum Herstellen von Vliesbahnen (18) verwendeten Art, umfassend einen Formkopf (2) mit perforierten Boden (7) und wenigstens einer Reihe (14) drehbarer Flügel (15), die in einem Abstand über dem Boden (7) angeordnet sind, zum während des Herstellens durchgeführten Auskehrens zugeführter Fasern (4, 6) entlang der wenigstens einen Reihe (14) der Flügel (15) in einem Luftstrom, bevor sie nacheinander den Formkopf (2) verlassen durch die Öffnungen (8) des perforierten Bodens (7), um in einer Schicht (16) auf dem oberen Teil (17) des Formdrahts (9) abgelegt zu werden, wobei die Fasern (4, 6), während sie in dieser Weise ausgekehrt werden, dazu neigen, Nissen (20, 21) zu bilden und die Flügel (15) mit einer optimalen Drehgeschwindigkeit in einem Intervall gedreht werden, in dem sich die Neigung der Fasern (4, 6), Nissen zu bilden (20, 21) von weniger zu größer ändert, wenn die Drehgeschwindigkeit der Flügel (15) zunimmt.
  8. Faserverteiler nach Anspruch 7, einen Regler zur Regelung der optimalen Drehgeschwindigkeit in Übereinstimmung mit der Zusammensetzung der Fasern (4, 6) und der Anordnung des eigentlichen Faserverteilers aufweisend.
  9. Faserverteiler nach Anspruch 8, dadurch gekennzeichnet, dass der Regler zur Regelung der optimalen Drehgeschwindigkeit in einem Intervall um einen Mittelwert optimal angepasster Drehzahl eingerichtet ist, bei der die Anzahl der Nissen (20, 21) klein oder am kleinsten ist, wobei das Intervall eine Größe zwischen dem 0,5- und 1,5-fachen, bevorzugt zwischen dem 0,75- und 1,25-fachen und speziell zwischen dem 0,9- und 1,1.fachen der optimalen Drehgeschwindigkeit der Flügel hat.
  10. Faserverteiler nach Anspruch 7, aufweisend:
    - einen Detektor (22) zum Erfassen des Prozentsatzes der Nissen (20, 21) in der Faserschicht (16) auf dem Formdraht (9) oder in der sich ergebenden Vliesbahn (18) und Senden von Signalen, die die Ergebnisse dieser Erfassung darstellen, als Eingabe an einen Computer (23),
    - ein Programm des Computers (23) zum Berechnen eines Werts mittels der Eingabe, der eine optimale Drehgeschwindigkeit darstellt, bei der die Anzahl der Nissen (20, 21) klein oder am kleinsten ist und Erzeugen einer Ausgabe, die den Wert darstellt, und
    - einen oder mehrere Aktuatoren (24, 25, 26, 27, 28, 29) zum Drehen der Flügel (15) mit Drehzahlen, die durch diese Werte dargestellt werden, durch Erhalten der Ausgabe.
  11. Faserverteiler nach Anspruch 7 - 10, dadurch gekennzeichnet, dass der gegenseitige Abstand zwischen jeder von zwei benachbarten Reihen (14) der Flügel (15) der gegenseitige Abstand zwischen zwei Flügeln (15) in einer Reihe zuzüglich zwischen 50 mm und 135 mm, insbesondere zwischen 75 mm und 105 mm, ist.
  12. Faserverteiler nach Anspruch 7 - 11, dadurch gekennzeichnet, dass der Abstand zwischen den Flügeln und dem perforierten Boden zwischen 1 mm und 12 mm, bevorzugt zwischen 2 mm und 7 mm und insbesondere zwischen 3 mm und 5 mm ist.
EP04734995.6A 2003-05-28 2004-05-27 Verfahren und faserverteiler für trockenvliesbildung Expired - Lifetime EP1633912B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL04734995T PL1633912T3 (pl) 2003-05-28 2004-05-27 Sposób oraz urządzenie do układania włókien wykorzystujące technikę igłowania powietrzem

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200300805 2003-05-28
PCT/DK2004/000370 WO2004106604A1 (en) 2003-05-28 2004-05-27 A method and a fibre distributor for air-laying fibres

Publications (2)

Publication Number Publication Date
EP1633912A1 EP1633912A1 (de) 2006-03-15
EP1633912B1 true EP1633912B1 (de) 2014-07-16

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EP04734995.6A Expired - Lifetime EP1633912B1 (de) 2003-05-28 2004-05-27 Verfahren und faserverteiler für trockenvliesbildung

Country Status (10)

Country Link
US (1) US20060055072A1 (de)
EP (1) EP1633912B1 (de)
JP (1) JP2006529006A (de)
CN (1) CN1795296B (de)
BR (1) BRPI0410699A (de)
CA (1) CA2525289C (de)
DK (1) DK1633912T3 (de)
MX (1) MXPA05012869A (de)
PL (1) PL1633912T3 (de)
WO (1) WO2004106604A1 (de)

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MXPA03010630A (es) * 2001-05-24 2004-03-09 Lilly Co Eli Nuevos derivados de pirrol como agentes farmaceuticos.
US20100092746A1 (en) * 2008-10-14 2010-04-15 Jean-Marie Coant Nonwoven material containing benefiting particles and method of making
DE102010035944A1 (de) 2010-08-31 2012-03-01 Oerlikon Textile Gmbh & Co. Kg Verfahren und Vorrichtung zum Trockenformen einer Faserbahn
DE102010052010A1 (de) 2010-11-19 2012-05-24 Oerlikon Textile Gmbh & Co. Kg Vorrichtung zum Trockenformen einer Faserbahn
DE102012111815A1 (de) * 2011-12-22 2013-06-27 Oerlikon Textile Gmbh & Co. Kg Vorrichtung zum Trockenformen einer Faserbahn

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EP1167590A3 (de) * 2000-06-23 2002-09-11 Maschinenfabrik Rieter Ag Faserlängenmessung
EP1215312A1 (de) * 2000-12-18 2002-06-19 Maschinenfabrik Rieter Ag Online Messtechnik
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Publication number Publication date
EP1633912A1 (de) 2006-03-15
US20060055072A1 (en) 2006-03-16
WO2004106604A1 (en) 2004-12-09
BRPI0410699A (pt) 2006-06-20
MXPA05012869A (es) 2006-02-22
CA2525289A1 (en) 2004-12-09
DK1633912T3 (da) 2014-10-06
PL1633912T3 (pl) 2014-11-28
CN1795296B (zh) 2010-09-08
CN1795296A (zh) 2006-06-28
JP2006529006A (ja) 2006-12-28
CA2525289C (en) 2011-11-15

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