EP1897979A2 - Verfahren und System zur Produktion eines mehrschichtigen Vlieses, insbesondere mittels eines Vlieslegers - Google Patents

Verfahren und System zur Produktion eines mehrschichtigen Vlieses, insbesondere mittels eines Vlieslegers Download PDF

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Publication number
EP1897979A2
EP1897979A2 EP07370015A EP07370015A EP1897979A2 EP 1897979 A2 EP1897979 A2 EP 1897979A2 EP 07370015 A EP07370015 A EP 07370015A EP 07370015 A EP07370015 A EP 07370015A EP 1897979 A2 EP1897979 A2 EP 1897979A2
Authority
EP
European Patent Office
Prior art keywords
speed
web
fibrous web
buffer
output
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.)
Withdrawn
Application number
EP07370015A
Other languages
English (en)
French (fr)
Other versions
EP1897979A3 (de
Inventor
Jean-Christophe Laune
François LOUIS
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.)
Asselin Thibeau SAS
Original Assignee
Asselin Thibeau SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Asselin Thibeau SAS filed Critical Asselin Thibeau SAS
Publication of EP1897979A2 publication Critical patent/EP1897979A2/de
Publication of EP1897979A3 publication Critical patent/EP1897979A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
    • B65H23/1882—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web and controlling longitudinal register of web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/06—Advancing webs by friction band
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G25/00—Lap-forming devices not integral with machines specified above
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/74—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being orientated, e.g. in parallel (anisotropic fleeces)

Definitions

  • the present invention relates to the production of a multilayer fibrous web, and in particular of a thick multilayer fibrous web obtained by folding a web of nonwoven fibers by means of a crosslapper whose output member can have a discontinuous feed mode.
  • a machine commonly called a crosslapper, is used to manufacture a thick multilayer fibrous web by folding a nonwoven web of fibers onto a moving conveyor belt. and oriented transversely to the longitudinal direction of the web.
  • the nonwoven web is, for example, delivered upstream of the crosslapper by a device for producing nonwoven web, such as in particular a nonwoven card.
  • a multilayer fibrous web is obtained which consists of successive transverse folds overlapping at an oblique angle.
  • crosslapper structures have in common to include means for unwinding the fibrous web on the transverse exit belt, which feeding means are driven reciprocating back and forth to obtain the folding of the fibrous web.
  • said unwinding means comprise a lower unwinding carriage driven reciprocally above the transverse exit conveyor. The stroke of this carriage determines the width of the web.
  • the multilayer fibrous web Downstream of the crosslapper, the multilayer fibrous web is then processed by one or more in-line machines, and is especially consolidated, for example by mechanical needling. It may also, in some applications, pass into a drawing device composed of a plurality of successive rollers whose circumferential speeds are increasing, so as to obtain a mechanical stretching of the fibrous web in the direction of its length (direction machine).
  • the entry speed of this downstream machine is constant, and can not follow the movement discontinuous output of the spreader-lapper.
  • this speed is substantially equal to the average speed of the exit belt of the crosslapper during all its operating phases.
  • the multilayer and unconsolidated structure (the layers are not linked together) of the web at the output of the crosslapper makes the handling of this web constraining.
  • care must be taken to avoid the phenomena of reversal of the upper layers during transport of the web before consolidation.
  • the stretching rates must be limited and constant over time, so as not to risk delamination of the layers of the sheet.
  • the present invention aims to propose a new technical solution for improving the production of a thick multilayer fibrous web, which is delivered, in unconsolidated form and with a variable speed, by an upstream device, such as, for example, but not exclusively, a spreader-spreader with no advance constant and more particularly in discontinuous advance.
  • an upstream device such as, for example, but not exclusively, a spreader-spreader with no advance constant and more particularly in discontinuous advance.
  • This buffer and compactor device of the invention makes it possible to compress a multilayer fibrous web, such as, for example, a thick sheet delivered by a crosslapper, and to automatically compensate for variations in the entry speed Ve (t) of this fibrous web. multilayer, especially without stretching or condensing, so as to output a multilayer fibrous web at a predefined output speed Vs (t) and different from the input speed Ve (t).
  • Another object of the invention is a system and a method for continuous production of a multilayer fibrous web employing said buffer and compactor device.
  • FIG. 1 shows a particular example of a continuous production system for a multilayer fibrous web, which is in accordance with the invention.
  • this production system comprises a crosslapper 1, a specific buffer compactor device 2 of the invention and disposed immediately downstream of the crosslapper 1, and a processing machine 3, which is arranged immediately downstream of the buffer compactor device 2.
  • the downstream processing machine 3 is constituted by a roller stretcher.
  • the invention is not limited to the use of a downstream machine 3 of this type, but can more generally be implemented with any type of processing machine and / or transport and / or handling of the delivered web. at the output by the buffer compactor device 2.
  • the roller stretcher 3 can be replaced by one or more in-line machines having other functionalities, and for example by a machine of the invention.
  • consolidation known per se
  • crosslapper 1 allowing, from a nonwoven web of fibers W (FIG. 2), to manufacture a multi-layer fibrous web N, by folding the web W on a forming surface 140 which is movable in a transverse direction ( Figure 2 / arrow K) to the longitudinal direction of the web W.
  • FIG. 3 a known example of spreader-lapper structure 1.
  • the structure and operation of the crosslapper 1 of FIG. 3 are known. those skilled in the art and therefore will not be detailed in the present description. For the sake of simplification and brevity, only the technical elements of the crosslapper 1 necessary for the understanding of the present invention will be described hereinafter.
  • the crosslapper 1 comprises two belt conveyors 10 and 11, and an output band conveyor 14.
  • the conveyor belt 10 comprises an endless conveyor belt 100 which is wound in a closed path on guide rollers 101a to 101l, at least one of which is motorized for driving the conveyor belt 100
  • the conveyor belt 100 may, regardless of the invention, be permeable or impermeable to air.
  • the two rear guide rollers 101a, 101b are usually embarked on an upper movable entry trolley 12, and are mounted free to rotate about their central axis relative to the trolley 12.
  • the rollers 101j, 101k and 101l are usually embarked on a lower output carriage 13 movable, and are mounted free in rotation along their central axis relative to the carriage 13.
  • the upper carriage 12 and the lower carriage 13 are movable in translation, and are equipped with drive means (not shown) for translating them in translation alternately in the two opposite directions D and G.
  • the belt conveyor 11 comprises a conveyor belt 110 which is wound in a closed path on guide rollers 111a to 111j, at least one of which is motorized for driving the conveyor belt 110.
  • the guide rollers 111a at 111d are usually embarked on the carriage 12 mobile, and are mounted free in rotation about their central axis relative to the carriage 12.
  • the guide roller 111e is embedded on the carriage 13, and is rotatably mounted according to its central axis with respect to this carriage 13.
  • the nonwoven web W (produced upstream of the crosslapper for example by means of a card not shown and transported for example upstream of the crosslapper 1 by means of an upstream conveyor T) is deposited at the entrance E of the crosslapper 1 to the surface of the input conveyor belt 100.
  • This nonwoven web W is conveyed by the conveyor belt 100 to a nip zone between the two webs. transport 100 and 110 (between the guide rollers 111e and 101j). Due to the synchronized back-and-forth movements of the carriages 12 and 13, the nonwoven web W is reciprocated back and forth in the opposite directions G and D, thereby allowing the nonwoven web W to be folded alternately. itself to the surface of the conveyor belt 140 of the output conveyor 14.
  • This conveyor belt 140 is oriented and is movable in a direction K transverse to the directions (D and G) of movement of the carriages 12 and 13, being frictionally driven by a motorized guide roller 141.
  • a thick multilayer nonwoven web N formed of a a plurality of transverse and alternating P plies overlapping V in the direction of displacement K of the surface 140 forming the web. This sheet is transported at the exit by the conveyor belt 140 to the inlet of the buffer compacting device 2.
  • FIG. 5 shows known examples of linear velocity profile V (t) for moving the lower carriage 13 for feeding the crosslapper 1 and the linear velocity profile V '(t) for the surface. 140 formation of the water table N.
  • an operating cycle of the lower unwinding carriage 13 can be broken down into six successive phases (I to VI).
  • phases I and IV the unwinding carriage 13 is moved at maximum constant speed V MAX respectively in the two opposite directions D and G.
  • the unwinding carriage 13 is slowed down until it reaches immobilized in one of its two end positions.
  • phases III and VI the unwinding carriage 13 is accelerated, in the reverse direction of its displacement of the previous phase (reversal of the direction of movement of the carriage 13) until reaching the maximum speed V MAX again .
  • the speed V '(t) of displacement of the surface 140 forming the web N is also variable in time, and more particularly is proportional to the absolute value
  • the speed of displacement of V (t) of the unwinding carriage 13
  • the speed of displacement of V (t) of the unwinding carriage 13
  • the surface 140 for forming the web N is also temporarily stopped.
  • the proportionality factor k between the velocities V '(t) and V (t) [V't] k.
  • ] depends on the desired weight for the web N at the output of the crosslapper 1. The higher the proportionality factor k, the lower the weight of the web.
  • the unconsolidated sheet N is taken up by the buffer compacting device 2, with an input speed Ve (t) which is variable in time, and which is substantially equal to the speed V (t) of the surface 140 forming the N web.
  • the buffer compacting device 2 comprises two lower and upper endless conveyor belts 21.
  • the conveyor belt 20 or 21 may be permeable or impervious to air. Nevertheless, at least one of the two end conveyor belts 20 or 21 is preferably breathable, in order to facilitate the expulsion of the air trapped in the sheet during its compression.
  • the endless conveyor belt 20 is wound along a closed path on guide rollers 200, 201, 214, 202, 203 and 204.
  • the endless conveyor belt 21 is wound along a closed path on guide rollers 210, 211, 212, 213, 214, 201.
  • the two guide rollers 201 and 214 are common to the two conveyor belts 20 and 21. These two guide rollers 201 and 214 follow one another in the closed path of the two endless belts 20 and 21, and the two two endless conveyor belts 20 and 21 are wound on these two guide rollers 201 and 214 in such a way that that on the one hand at the periphery of the guide roller 201, the conveyor belt 20 is in contact with the surface of said roller 201, and the other conveyor belt 21 is, in the absence of a sheet, in contact with the conveyor belt 20; on the other hand and conversely, at the periphery of the guide roller 214, the conveyor belt 21 is in contact with the surface of said roller, and the other conveyor belt 20 is, in the absence of a sheet, in contact with the conveyor belt 21. Between the two guide rollers 201 and 214, the two conveyor belts 20 and 21 are, in the absence of a sheet, in contact with each other.
  • the axes of the guide rollers 210 and 200, which are positioned immediately upstream of the guide roller 201, are offset in height with respect to the axis of this guide roller 201, so that upstream of the guide roller 201, the two conveyor belts 20 and 21 form a V-shaped funnel, and delimit between them an area 22 of decreasing passage section which allows a gripping and a progressive compression of the incoming web N.
  • the axes of the guide rollers 202 and 213, which are positioned immediately downstream of the guide roller 214, are offset in height with respect to the axis of this guide roller 214, so that downstream of the guide roller 214, the two conveyor belts 20 and 21 delimit between them an outlet zone 23 of increasing passage section, which allows to gradually release the compressed outgoing sheet N '.
  • the guide rollers 200, 203, 204, 210, 211, 212, 213 and 214 are idler rolls.
  • the two guide rollers 201 and 202 are drive rollers.
  • the motor guide roller 201 is rotated at a variable speed, which follows the same speed law as the output speed V '(t) of the crosslapper 1.
  • the circumferential speed Ve (t) of this roll motorized guide 201 is substantially identical to the above-mentioned linear speed V '(t) of the crosslapper 1.
  • the guide roller 201 can be mechanically coupled to the motorized guide roller 141 of the conveyor belt 14 of the crosslapper 1, or be driven directly by its own motor with electronic servocontrol in position or speed of this motor relative to the motor driving the motorized guide roller 141 of the conveyor 14 of the output of the crosslapper 1.
  • the motor guide roller 202 is rotated at a circumferential speed Vs (t), which follows the same speed law as the downstream machine 3, and which is different from the aforementioned speed Ve (t).
  • Vs (t) a circumferential speed
  • Ve (t) a speed law
  • the guide roller is mechanically coupled in rotation to the downstream machine 3, or is driven directly by its own motor with electronic servocontrol in position or speed of this motor with the downstream machine 3.
  • This speed Vs (t) can be variable in time.
  • the guide rollers 210, 211, 212, 200, 201, 202 and 203 are fixed in position.
  • the guide rollers 204, 213 and 214 are embedded on a carriage 24, which is movable and guided in translation in the two opposite directions A (direction of travel of the web downstream of the guide roller 214) and B (direction opposite to the direction of movement of the web downstream of the guide roller 214). More particularly, the guide roller 214 common to the two conveyor belts 20, 21 and embedded on the carriage 24 is positioned between the two other guide rollers 204, 213 mounted on the carriage 24.
  • the buffer compactor device 2 is fed at the input with the unconsolidated multilayer N-sheet from the crosslapper 1, said sheet N advancing discontinuously according to the speed law V '(t).
  • This sheet N is pinched, at the entrance of the device 2, between the two conveyor belts 20 and 21, is gradually compressed to the guide roller 201, is more strongly compressed during its journey between the two guide rollers 201 , 214, then is gradually released downstream of the guide roller 214.
  • This compression of the web during its passage through the device 2 advantageously makes it possible to obtain pre-consolidation of the structure of the web.
  • the compressed tablecloth N 'of smaller thickness, which is obtained at the output of the device 2, is more robust and easier to handle, which facilitates subsequent operations of transport, treatment or handling of the web (stretching, needling, winding , etc ).
  • the compressed web N ' is also less sensitive to airflow disturbances that may alter its structure; in particular, the risks of accidental reversal of the upper layers of the sheet are advantageously reduced.
  • the compression obtained advantageously reduces the risk of delamination of the different layers of the web. Stretching the web in the direction of its length by passing through the stretcher 3 can thus be achieved gradually, reducing the risk of slippage of the layers relative to each other.
  • This improvement in delamination resistance is particularly advantageous at the longitudinal edges of the web W, since it helps to attenuate the effects of "V" lapping.
  • the carriage 24 of the device 2 with the onboard guide rollers 204, 213 and 214, advantageously makes it possible to absorb the differences in speed between the input speed Ve (t) and the output speed Vs (t).
  • the compactor device 2 makes it possible to supply the downstream machine 3 with an optimum web speed, which is not affected by the changes of velocities experienced by the web N at the exit of the crosslapper 1.
  • the compressed web N 'does not undergo any stretching or condensation altering its structure, which is important at this stage of the treatment of the sheet, because the constituent layers of the sheet have not yet been strongly bonded together by mechanical needling or equivalent.
  • the compaction device 2 of the invention is particularly advantageous to implement at the output of a crosslapper 1 whose surface 140 for forming the web is in advance non-constant, and more particularly in discontinuous advance.
  • the crosslapper 1 does not necessarily have the particular structure of the crosslapper of FIG. 2, but may comprise any type of known crosslapper structure, the essential point being that the crosslapper generally comprises a reeling means to reciprocating motion and a movable forming surface, the unwinding means for depositing a nonwoven web on the moving forming surface, folding the web over itself, and the forming surface being moved with a variable linear velocity during the formation of the multilayer web.
  • the buffer compacting device 2 of the invention can also, and more generally, be used interposed between any upstream device delivering, with a variable speed. in time, a thick unconsolidated multilayer web, and a downstream device having an input speed not following the same law as the output speed of the upstream device.
  • the upstream device is not necessarily a device for forming a multilayer web such as a spreader-lapper, but can be any device more generally for conveying an unconsolidated thick multilayer web with a speed V '(t) variable, without this upstream device having a web formation feature.
EP07370015A 2006-09-11 2007-09-11 Verfahren und System zur Produktion eines mehrschichtigen Vlieses, insbesondere mittels eines Vlieslegers Withdrawn EP1897979A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0607922A FR2905684A1 (fr) 2006-09-11 2006-09-11 Procede et systeme de production d'une nappe multicouche, notamment au moyen d'un etaleur-nappeur.

Publications (2)

Publication Number Publication Date
EP1897979A2 true EP1897979A2 (de) 2008-03-12
EP1897979A3 EP1897979A3 (de) 2009-06-24

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EP07370015A Withdrawn EP1897979A3 (de) 2006-09-11 2007-09-11 Verfahren und System zur Produktion eines mehrschichtigen Vlieses, insbesondere mittels eines Vlieslegers

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EP (1) EP1897979A3 (de)
FR (1) FR2905684A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2930563A1 (fr) * 2008-04-28 2009-10-30 Asselin Thibeau Soc Par Action Dispositif tampon et systeme de production d'une bande de non-tisse
EP2537967A1 (de) * 2011-06-20 2012-12-26 Oskar Dilo Maschinenfabrik KG Verfahren zum Betrieb eines Vlieslegers
EP3360990A1 (de) * 2017-02-08 2018-08-15 Trützschler GmbH & Co. KG Speichertisch für einen vliesleger und verfahren zum betrieb eines speichertisches
WO2024023049A1 (fr) * 2022-07-25 2024-02-01 Andritz Asselin-Thibeau Dispositif tampon pour adapter la vitesse de sortie d'une nappe d'un etaleur nappeur a la vitesse d'entree d'un dispositif de traitement de la nappe en aval de l'etaleur nappeur

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5762254A (en) * 1996-11-06 1998-06-09 Arpeco Engineering Ltd. Mechanism for changing a web feed from intermittent to constant motion
EP1386990A1 (de) * 2001-08-14 2004-02-04 Oskar Dilo Maschinenfabrik KG Streckwerk für eine Florbahn
US20050193525A1 (en) * 2004-03-08 2005-09-08 Oskar Dilo Maschinenfabrik Kg Fleece laying device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2667045B1 (fr) * 1990-09-20 1995-03-10 Montier Robert Dispositif mobile et telescopique pour couvrir le cheminement des passagers entre un local et un aeronef.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5762254A (en) * 1996-11-06 1998-06-09 Arpeco Engineering Ltd. Mechanism for changing a web feed from intermittent to constant motion
EP1386990A1 (de) * 2001-08-14 2004-02-04 Oskar Dilo Maschinenfabrik KG Streckwerk für eine Florbahn
US20050193525A1 (en) * 2004-03-08 2005-09-08 Oskar Dilo Maschinenfabrik Kg Fleece laying device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2930563A1 (fr) * 2008-04-28 2009-10-30 Asselin Thibeau Soc Par Action Dispositif tampon et systeme de production d'une bande de non-tisse
EP2128314A3 (de) * 2008-04-28 2010-01-20 Asselin-Thibeau Puffervorrichtung und -system sowie Produktionssystem einer Vliesstoffbahn
EP2537967A1 (de) * 2011-06-20 2012-12-26 Oskar Dilo Maschinenfabrik KG Verfahren zum Betrieb eines Vlieslegers
CN102839450A (zh) * 2011-06-20 2012-12-26 奥斯卡迪罗机械制造公司 用于操作纤维网铺设机的方法
US8464400B2 (en) 2011-06-20 2013-06-18 Oskar Dilo Maschinenfabrik Kg Method for operating a fleece layer
EP3360990A1 (de) * 2017-02-08 2018-08-15 Trützschler GmbH & Co. KG Speichertisch für einen vliesleger und verfahren zum betrieb eines speichertisches
WO2024023049A1 (fr) * 2022-07-25 2024-02-01 Andritz Asselin-Thibeau Dispositif tampon pour adapter la vitesse de sortie d'une nappe d'un etaleur nappeur a la vitesse d'entree d'un dispositif de traitement de la nappe en aval de l'etaleur nappeur

Also Published As

Publication number Publication date
FR2905684A1 (fr) 2008-03-14
EP1897979A3 (de) 2009-06-24

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