EP2128314B9 - Buffer device or system and system for producing a non-woven strip - Google Patents
Buffer device or system and system for producing a non-woven strip Download PDFInfo
- Publication number
- EP2128314B9 EP2128314B9 EP09370008A EP09370008A EP2128314B9 EP 2128314 B9 EP2128314 B9 EP 2128314B9 EP 09370008 A EP09370008 A EP 09370008A EP 09370008 A EP09370008 A EP 09370008A EP 2128314 B9 EP2128314 B9 EP 2128314B9
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- European Patent Office
- Prior art keywords
- transport
- web
- linear speed
- upstream
- downstream
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Classifications
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- 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
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
- D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
- D01G15/02—Carding machines
- D01G15/12—Details
- D01G15/46—Doffing or like arrangements for removing fibres from carding elements; Web-dividing apparatus; Condensers
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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
- D04H1/74—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 non-woven monolayer or multilayer webs, and more particularly the production of fibrous webs obtained by folding a nonwoven fibrous web by means of a crosslapper, the production of non-fibrous webs. -tissés, or the production of multilayer non-woven strips obtained by superposition of at least two nonwoven fibrous webs.
- the invention relates more precisely to a buffer system or buffer device for compensating, where appropriate, the speed variations of a non-woven strip at the output of an upstream machine, so as to feed a downstream processing machine with a predefined speed. .
- the invention finds more particularly, but not exclusively, an application in the production and processing of a thick multilayer fibrous web obtained by folding a nonwoven fibrous web by means of a crosslapper whose output member can have a discontinuous feed mode.
- a machine commonly referred to as 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 the fact that they comprise means of unwinding the fibrous web on the transverse exit belt, which means unwinding 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 unwinding means eg unwinding carriage
- the exit belt is driven at a constant speed, repeated deformations of fibrous material occur during the deceleration / stop / acceleration phase of the unwinding means. These deformations may result in damaging oversizes and variable fiber orientations at the two longitudinal edges of the web. To avoid these harmful deformations, it is customary today, as taught in particular in the aforementioned French patent application.
- 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 (machine direction).
- 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 exit belt of the crosslapper is slowed down, then is accelerated temporarily with respect to the speed of entry downstream machine.
- 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 buffer device comprises a lower conveyor belt, an upper conveyor belt associated with suction means, and an accumulator transfer roller.
- This accumulator transfer roller is positioned between the two conveyor belts, and is movable in translation between the two strips.
- the lower conveyor belt is driven at a non-constant speed corresponding to the output speed of the roller stretcher.
- the upper conveyor belt is driven at a constant speed corresponding to the entry speed of the crosslapper.
- the suction means for suction plating the nonwoven web on the lower strand of the upper conveyor belt In operation, the nonwoven web is transported by the lower conveyor belt to the accumulator transfer roller, is transferred by said roll to the lower strand of the upper conveyor belt.
- the suction used allows the recovery of the nonwoven web by this lower strand of the upper conveyor belt.
- the nonwoven web is then conveyed by the upper conveyor belt to the entry of the crosslapper.
- the accumulator transfer roller is equipped with motorized means for moving it between the two upper and lower conveyor belts so as to automatically shorten or lengthen the path length of the nonwoven web as a function of the speed differential between the two webs. two transport bands.
- This first embodiment of the buffer device described in the publication US 2003/0033691 is difficult to implement because it requires the use of suction means, able to maintain the nonwoven web on the lower strand of the conveyor belt. Also, in this buffer device, the nonwoven web undergoes two successive turns, a first turn around the accumulator transfer cylinder and a second turnaround on the upper conveyor belt, which can be detrimental to the structure and quality the nonwoven web, in particular being an unconsolidated nonwoven web. Finally, this buffer device is not suitable for thick multilayer fibrous webs such as those produced at the output of a crosslapper.
- the buffer device comprises a first conveyor belt driven at a non-constant speed corresponding to the output speed of the roller stretcher, a second conveyor belt driven at a constant speed corresponding to the entry speed of the crosslapper and an accumulator strip disposed between the first and second strips.
- Said third accumulator strip is translatable vertically between the first and second conveyor belts so as to adjust the length of the nonwoven web path as a function of the speed differential between the two conveyor belts.
- the nonwoven web is conveyed by the first conveyor belt to the accumulator web and is transferred by said accumulator web to the second conveyor belt. More specifically, the nonwoven web is transported on a first vertical portion between the first conveyor belt and the accumulator strip and, after reversal, is transported on a second vertical portion, between said accumulator strip and the second conveyor belt. The nonwoven web is then conveyed by the second conveyor belt to the entrance of the crosslapper.
- This second embodiment of the buffer device described in the publication US 2003/0033691 also reverses to the nonwoven web, which can be detrimental to the structure and quality of the nonwoven web.
- the vertical translation movements of the accumulator tape can also damage the nonwoven web that is transported between said accumulator tape and the transport belts.
- the buffer device is also not suitable for thick multilayer fibrous webs such as those produced at the output of a crosslapper.
- the present invention aims to propose a new device or buffer system which is disposed downstream of a machine delivering a single-layer or multilayer non-woven strip with a speed that can be variable, and which makes it possible to compensate, if necessary, said speed variations. without altering the nonwoven web structure.
- Another object of the invention is a system for continuously producing a nonwoven web having the technical features of claim 25 or claim 29.
- FIG. 1 a first embodiment of a continuous production system of a fibrous web N.
- This system comprises a crosslapper 1, a specific buffer 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 device 2.
- the downstream processing machine 3 is constituted by a roller stretcher.
- the roller stretcher 3 can be replaced by one or more in-line machines having other functionalities, and for example by a consolidation machine (known per se ) the structure of the multilayer fibrous web N; the consolidation machine may for example allow consolidation of hydraulic type (implementation of water jets), or mechanical type (needling or cold calendering), or thermomechanical type (hot calendering thermoling). he is also it is possible to provide, for example, downstream of the buffer device 2, a consolidation machine followed by a drawing device.
- the buffer device 2 described hereinafter in detail is compact and easily integrable into existing lines between two upstream 1 and downstream machines 3. It also advantageously makes it possible to transfer an unconsolidated N fibrous web that can be thick without subjecting significant modification to the structure of the sheet, and in particular without compression of the sheet. This buffer device 2 can also be used to transfer fibrous webs N of width.
- the crosslapper 1 is known per se and its structure will not be detailed. For a complete understanding of the structure and operation of the crosslapper 1, one skilled in the art can refer for example to the text of the international patent application WO 92/21799 .
- the crosslapper 1 allows, from a nonwoven web of fibers W ( figure 3 ) which is transported to the entry E of the crosslapper by an endless conveyor belt 10, to produce at the exit S a multi-layered fibrous sheet N, by folding the web W on a surface 11a of formation and transport of the tablecloth.
- This surface 11a of formation and transport of the web N is formed by the upper end of an endless conveyor belt 11 and is driven in a transverse direction ( Figure 3 / arrow K) to the longitudinal direction of the web W at a linear velocity V1 (t). More particularly, this endless transport belt 11 is wound on guide rollers, including a downstream guide roller 12, which may for example be a motor roller driven in rotation by a motor or geared motor M1 at a rotational speed. ⁇ 1 (t).
- the spreader-lapper 1 usually comprises a lower carriage (not shown) for feeding the web W on the forming surface 11a.
- This carriage is movable in translation, and is equipped with motorized drive means for moving it in translation alternately in two opposite directions D and G.
- this carriage is driven with a translational movement back and forth in opposite directions D and G, so as to deposit the nonwoven web W on the forming surface 11a by folding it alternately on itself.
- a thick, unconsolidated non-woven multilayer nonwoven web N formed of a plurality of transverse and alternating plies V overlapping in the direction of displacement K of the surface 11a of formation of the web.
- This sheet N is conveyed at the output of the crosslapper 1 by the conveyor belt 11 at a linear speed V1 (t) to a delivery zone Zd of the transport surface 11a, at which the tablecloth The non-woven fabric N leaves the transport surface 11a and is transferred to the inlet of the buffer device 2.
- This delivery zone Zd is located at the periphery of the downstream guide roller 12.
- the speed V1 (t) of the conveyor belt 11 is not constant, but varies cyclically in synchronism with the speed of movement of the aforementioned unwinding carriage of the crosslapper.
- V1 (t) the speed of the conveyor belt 11
- two examples curves C1 and C2 of linear velocity profiles V1 (t).
- Phase I corresponds for example to a go of the unwinding carriage (for example in the direction G) and phase II corresponds to a return of the unwinding carriage (for example in the direction D).
- the linear speed V1 (t) varies sinusoidally in time, between a maximum speed Vmax and a minimum speed Vmin which, in the particular case of the curve C1, is zero.
- Vmin 0
- Curve C2 illustrates another linear velocity profile V1 (t) cyclic sinusoidal type, which is centered on the same average speed value as the speed profile C1, but for which the maximum value Vmax is lower and the minimum value Vmin is not zero.
- the web N is taken up by the buffer device 2, which makes it possible to automatically adapt the length of travel of the web so as to automatically compensate for the speed variations V1 (t) of the web.
- fibrous N at the output of the crosslapper 1 and to transfer the web N to the input of the downstream processing machine 3 at a predetermined speed V2 (t) between the maximum values Vmax and minimum Vmin of the linear velocity V1 (t).
- this linear speed V2 (t) is constant and substantially equal to the average speed of the linear speed V1 (t) of the conveyor belt 11 of the crosslapper N.
- the downstream conveyor belt 11, the upstream belt conveyor 20 and the adjusting means 21 form a buffer system according to the invention.
- the belt conveyor 20 comprises an endless conveyor belt 200 which is wrapped around two guide rollers: a motor guide roller 201 and a mad upstream guide roller 202.
- the motor roller 201 is located at the output of the buffer device 2, and is equipped with a motor or gear motor M2 for driving in rotation at a speed of rotation ⁇ 2 (t) predefined corresponding to the aforementioned linear speed V2 (t)
- the idler roller 202 is located at the recovery zone Zr at the inlet of the buffer device 2.
- the motor or geared motor M2 of the roller 201 is slaved in speed so that the aforementioned linear speed V2 (t) is substantially equal to the average speed of the linear speed V1 (t) of the conveyor belt 11 of the crosslapper N.
- the belt conveyor 20 is articulated in rotation about the axis of the motor roller 201, so as to allow adjustment of the inclination of the belt conveyor 20, and thus to allow adjustment of the height position. the upstream guide roller 202, and thereby the height position of the recovery zone Zr of the conveyor belt 200.
- the means 21 for adjusting the height position of the recovery zone Zr of the belt conveyor 20 comprise, according to the first embodiment of the invention shown in FIGS. figures 1 and 2 at least one lifting assembly 210 210a-belt pulleys 210b, whose belt 210b is mechanically connected to the frame of the belt conveyor 20.
- This assembly 210 allows to pivot up or down the conveyor belt 20 around the axis of the motor roller 201 at a predefined linear velocity V3 (t), which is a function of the differential between the first velocity V1 (t) of the fibrous N at the output of the crosslapper 1 and the second velocity transport speed V2 (t) of the fibrous web in the buffer device 2.
- the adjusting means 21 comprise two lifting assemblies 210 positioned respectively on either side of the conveyor belt 200.
- the lifting assembly or sets 210 are motorized by means of a motor or geared motor M3 ( figure 2 ) which rotates one of the pulleys 210a of each set 210 at a speed of rotation ⁇ 3 (t) predefined, so as to lift or lower in rotation the belt conveyor 20 at the aforementioned linear speed V3 (t).
- the sheet N is conveyed to the inlet of the buffer device 2 with a linear velocity V1 (t) which varies cyclically over time, with for example one of the sinusoidal profiles of the figure 4 .
- the belt conveyor 20 is driven by a cyclic vertical oscillating movement (speed V3 (t)) synchronized with the linear speed V1 (t), between a low position and a high position ( represented in dotted lines on the figure 1 ).
- This vertical oscillating movement makes it possible to automatically adjust the height position of the recovery zone Zr of the conveyor belt 200 and thereby the distance between the delivery zone Zd of the upstream conveyor belt 11 and the recovery zone. Zr of the downstream conveyor belt 200.
- the travel length of the fibrous web N between the spreader-lapper 1 and the downstream processing machine 3 is thus automatically adjusted, so as to compensate for the speed variations of the web 11 of the spreader-spreader with respect to the linear speed V2 (t) of the conveyor belt 200 of the buffer device 2.
- the sheet N is transferred at the speed V2 (t) to the input of the downstream machine 3.
- the linear speed V2 (t) of the conveyor belt 200 of the buffer device 2 is substantially equal to the linear input speed of the downstream processing machine 3.
- the transport band 200 when the linear velocity V1 (t) of the tablecloth fibrous output of the crosslapper 1 is equal to the linear velocity V2 (t) of the transport band 200 of the buffer device 2, the transport band 200 is in the high position ( Figure 1 / height Hmax of the recovery zone Zr), which corresponds to a minimum path length of said fibrous web N.
- V1 (t) is greater than V2 (t)
- the transport band 200 of the buffer device 2 is lowered at speed V3 (t) to a low position ( Figure 1 / height Hmin of the recovery zone Zr), which corresponds to a length of the maximum path of said fibrous web N.
- This low position again corresponds to a linear velocity V1 (t) of the fibrous web at the exit of the spreader.
- the recovery zone Zr of the conveyor belt 200 is situated substantially at the same height and in the extension of the surface of the upper strand 11a of the conveyor belt 11 of the upstream machine 1 (crosslapper).
- the buffer device 2 may comprise one or more jacks 203 (visible only on the figure 1 ) that support the belt conveyor 20 and take some of the load of the conveyor belt 20 during its descent movement. It is preferably pneumatic or hydraulic cylinders. These jacks 203 make it possible to obtain a better balance of the masses of the belt conveyor 20 and thus advantageously to allow the implementation of a less powerful M3 engine.
- the belt pulley-type lifting assemblies 210 for adjusting the height of the recovery zone Zr of the belt conveyor 20 have been replaced by equivalent adjusting means, comprising two bidirectional linear cylinders 211, by means of example of the electric cylinders, the movable rod T is fixed to the frame of the belt conveyor 20
- equivalent adjusting means comprising two bidirectional linear cylinders 211, by means of example of the electric cylinders, the movable rod T is fixed to the frame of the belt conveyor 20
- These cylinders 211 can adjust the inclination of the belt conveyor 20 according to the differential between the speeds V1 (t) and V2 (t).
- the downstream belt conveyor 11 may be replaced by any other means of transport having a transport surface capable of transporting a nonwoven web at a speed V1 (t).
- the downstream band conveyor 11 can be replaced by a transport cylinder.
- the belt conveyor 20 can be replaced by any other equivalent means of transport allowing a take up of a sheet N at an automatically adjustable height and for transporting the sheet at a linear speed V2 (t) predefined.
- the belt conveyor 20 or equivalent is not necessarily variable inclination, but may for example be designed to be moved in translation vertically as a whole, i.e. including the motor roll 201.
- the conveyor belt 200 can be wound on a larger number of guide rollers.
- the conveyor belt 200 may be replaced by at least one transport cylinder whose height position is adjustable.
- the buffer device 2 may comprise several successive conveyor belts or equivalent, only the upstream conveyor belt at the inlet of the buffer device 2 being for example of variable inclination, so as to adjust the height of its recovery zone Zr of the tablecloth .
- FIG 7 an alternative embodiment of a buffer system of the invention, which is different from the buffer system of the figure 1 by implementing adjustment means 22 for adjusting the height position of the downstream guide roller 12 on which the endless conveyor belt 11 is wound, as a function of the speed differential V1 (t) and V2 (t ), so as to automatically adjust the distance between the delivery zone Zd of the upstream transport band 11 and the recovery zone Zr of the downstream conveyor belt 20, and therefore the travel length of the nonwoven web N.
- These adjustment means 22 comprise a lifting assembly 220 of 220a-belt pulleys type 220b, whose belt 220b is mechanically connected to the axis support of the downstream guide roller 12.
- This assembly 220 makes it possible to translate the guide roller 12 in translation upwards or downwards at a predefined linear speed V3 (t), which is a function of the differential between the first speed V1 (t) of the fibrous N at the output of the crosslapper 1 and said second speed V2 (t) of transport of the fibrous web in the buffer device 2.
- the adjustment means 22 comprise a motor or geared motor M3 which makes it possible to drive in rotation one of the pulleys 220a of each set 210 at a predetermined speed of rotation ⁇ 3 (t), so as to raise or lower in rotation the belt conveyor 20 at the aforementioned linear speed V3 (t).
- the sheet N is conveyed to the inlet of the buffer device 2 with a linear velocity V1 (t) which varies cyclically over time, with for example one of the sinusoidal profiles of the figure 4 .
- V1 (t) linear velocity
- the roller 12 of the belt conveyor 11 is driven by a cyclic vertical oscillating movement (speed V3 (t)) synchronized with the linear speed V1 (t), between a low position and a high position (shown in dotted lines).
- This vertical oscillating movement makes it possible to automatically adjust the height position of the delivery zone of the conveyor belt 11 and hence the travel length of the fibrous sheet N between the crosslapper 1 and the downstream processing machine.
- the sheet N is transferred at the speed V2 (t) to the input of the downstream machine 3.
- the linear speed V2 ( t) of the conveyor belt 200 of the buffer device 2 is substantially equal to the linear input speed of the downstream processing machine 3.
- the downstream conveyor belt 20 may optionally be of variable inclination and be equipped with adjustment means 21, as for the variant of the figures 1 or 5 .
- the downstream transport band 20 may also have no means for adjusting its inclination.
- the downstream belt conveyor 11 may be replaced by any other means of transport having a transport surface which is capable of transporting a non-woven web at a speed V1 (t), and of which at least a part at the delivery zone Zd is automatically adjustable in position according to the speed differential V1 (t) and V2 (t).
- the downstream belt conveyor 11 can be replaced by a transport cylinder whose height position is automatically adjustable as a function of the differential speed V1 (t) and V2 (t).
- the belt conveyor 20 may also be replaced by any other equivalent means of transport for receiving and taking up a web N on a transport surface, and transporting the web at a linear speed V2 (t) predefined.
- the belt conveyor 20 can be replaced by a transport cylinder.
- the upper end of the endless conveyor belt 200 downstream which allows the recovery and transport of the nonwoven web N at the speed V2 (t) is inclined upwards.
- the downstream guide roller 12 of the upstream endless conveyor belt 11 which allows the transport of the nonwoven web N at the speed V1 (t) is positioned near the upper end of the endless conveyor belt 200 and is movable in a plane substantially parallel to said strand upper, between an extreme high position (shown in dashed line) in which the travel length of the nonwoven web N is minimal and a low position in which the travel length of the nonwoven web N is maximum.
- This guide roller is equipped with means for adjusting its position, as a function of the differential speed V1 (t) and V2 (t), so as to automatically adjust the travel length of the nonwoven web N.
- These adjustment means are for example of the same type as the adjustment means 22 above.
- FIG 9 another variant embodiment of a buffer system of the invention.
- the upper end of the conveyor belt 200 downstream which allows the recovery and transport of the nonwoven web N at the speed V2 (t) is substantially horizontal.
- the downstream guide roller 12 'of the upstream endless conveyor belt 11' which allows the transport of the nonwoven web N at the speed V1 (t), is positioned near the upper end of the endless conveyor belt. downstream 200, and is movable in a plane substantially parallel to said upper strand, between a far right position in which the travel length of the nonwoven web N is minimal and a leftmost position in which the travel length of the web of nonwoven N is maximum.
- This guide roller is equipped with means for adjusting its position, according to the differential speed V1 (t) and V2 (t), so as to automatically adjust the travel length of the nonwoven web N. These means for example of the same type as the adjustment means 22 above.
- the buffer system of the figure 9 may comprise an additional band conveyor 11 "which is arranged such that the nonwoven web N is sandwiched between the two conveyor belts 11 'and 11".
- the downstream guide roller 12 "of this endless conveyor belt 11” is for example mechanically coupled to the downstream guide roll 12 'of the endless conveyor belt 11', so as to follow the movement of this roll of guide 12 'above the upper run of the downstream conveyor belt 200;
- the invention is not limited to the use of a device or buffer system at the output of a crosslapper, but may advantageously be used at the output of any upstream device or machine 1 generally delivering a band nonwoven at a non-constant speed.
- the nonwoven web is not necessarily an unconsolidated thick multilayer fibrous web, such as the web N obtained at the output of a crosslapper 1, but may also be a nonwoven fibrous web or a superposition of webs. fibrous nonwoven.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Nonwoven Fabrics (AREA)
- Preliminary Treatment Of Fibers (AREA)
- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
- Advancing Webs (AREA)
Abstract
Description
La présente invention concerne la production de bandes de non-tissé monocouches ou multicouches, et plus particulièrement la production de nappes fibreuses obtenues par repliage d'un voile fibreux non-tissé au moyen d'un étaleur-nappeur, la production de voiles fibreux non-tissés, ou la production de bandes de non tissé multicouches obtenues par superposition d'au moins deux voiles fibreux non-tissés. L'invention concerne plus précisément un système tampon ou dispositif tampon permettant de compenser le cas échéant les variations de vitesse d'une bande de non tissé en sortie d'une machine amont, de manière à alimenter une machine de traitement aval avec une vitesse prédéfinie. L'invention trouve plus particulièrement, mais non exclusivement, une application dans la production et le traitement d'une nappe fibreuse multicouche épaisse obtenue par repliage d'un voile fibreux non tissé au moyen d'un étaleur-nappeur dont l'organe de sortie peut disposer d'un mode d'avance discontinue.The present invention relates to the production of non-woven monolayer or multilayer webs, and more particularly the production of fibrous webs obtained by folding a nonwoven fibrous web by means of a crosslapper, the production of non-fibrous webs. -tissés, or the production of multilayer non-woven strips obtained by superposition of at least two nonwoven fibrous webs. The invention relates more precisely to a buffer system or buffer device for compensating, where appropriate, the speed variations of a non-woven strip at the output of an upstream machine, so as to feed a downstream processing machine with a predefined speed. . The invention finds more particularly, but not exclusively, an application in the production and processing of a thick multilayer fibrous web obtained by folding a nonwoven fibrous web by means of a crosslapper whose output member can have a discontinuous feed mode.
Dans le domaine de l'industrie textile du non-tissé, on utilise une machine, communément appelée étaleur-nappeur, pour fabriquer une nappe fibreuse multicouche épaisse, par repliage d'un voile de fibres non-tissé sur un tapis de sortie en mouvement et orienté transversalement à la direction longitudinale du voile. Le voile non-tissé est, par exemple, délivré en amont de l'étaleur-nappeur par un dispositif de production de voile non-tissé, tel que notamment une carde non-tissé. On obtient une nappe fibreuse multicouche qui est constituée par des plis transversaux successifs se chevauchant selon un angle oblique.In the field of the nonwoven textile industry, a machine, commonly referred to as 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.
Il existe à ce jour différentes structures connues d'étaleur-nappeur. Ces structures ont pour point commun de comporter des moyens de dévidage du voile fibreux sur le tapis de sortie transversal, lesquels moyens de dévidage sont animés d'un mouvement alternatif de va et vient permettant d'obtenir le repliement du voile fibreux. Dans un exemple connu d'étaleur-nappeur, décrit par exemple dans les demandes de brevet
Lorsque le moyen de dévidage (par exemple chariot de dévidage) arrive en bout de course pour ensuite faire demi-tour, on est obligé en pratique, du fait de son inertie, de le ralentir temporairement pour l'immobiliser dans sa position extrême, puis d'inverser son sens de déplacement en lui faisant subir une accélération temporaire. Si on entraîne le tapis de sortie à une vitesse constante, il se produit des déformations répétées de matière fibreuse pendant la phase de décélération/arrêt/accélération du moyen de dévidage. Ces déformations peuvent se traduire par des surépaisseurs préjudiciables et par des orientations de fibres variables au niveau des deux bords longitudinaux de la nappe. Pour éviter ces déformations préjudiciables, il est usuel à ce jour, tel que cela est enseigné notamment dans la demande de brevet français précitée
En aval de l'étaleur-nappeur, la nappe fibreuse multicouche est ensuite traitée par une ou plusieurs machines en ligne, et est notamment consolidée, par exemple par aiguilletage mécanique. Elle peut également, dans certaines applications, passer dans un dispositif d'étirage composé d'une pluralité de rouleaux successifs dont les vitesses circonférentielles sont croissantes, en sorte d'obtenir un étirage mécanique de la nappe fibreuse dans le sens de sa longueur (direction machine).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 (machine direction).
Généralement, lorsque la nappe fibreuse non consolidée est reprise en sortie de l'étaleur-nappeur par une machine aval (par exemple une aiguilleteuse ou un étireur), la vitesse d'entrée de cette machine aval est constante, et ne peut suivre le mouvement discontinu du tapis de sortie de l'étaleur-nappeur. En pratique cette vitesse est sensiblement égale à la vitesse moyenne du tapis de sortie de l'étaleur-nappeur, pendant toutes ses phases de fonctionnement. Il en résulte que pendant chaque phase d'inversion du sens de déplacement des moyens de dévidage de l'étaleur-nappeur, le tapis de sortie de l'étaleur-nappeur est ralenti, puis est accéléré temporairement par rapport à la vitesse d'entrée de la machine aval. Ces variations de vitesse répétées se traduisent par des successions d'étirage et de condensation temporaires de la nappe fibreuse à l'entrée de la machine aval, qui peuvent être préjudiciables à la régularité en poids de la nappe et à sa qualité. En particulier, les étirages successifs subis par la nappe peuvent aboutir de manière préjudiciable à une modification non contrôlée de l'orientation relative des couches de la nappe. Les étirages successifs peuvent également induire des variations non contrôlées de la largeur finale de la nappe.Generally, when the unconsolidated fibrous web is taken out of the crosslapper by a downstream machine (for example a needling machine or a tenter), the entry speed of this downstream machine is constant, and can not follow the movement discontinuous output of the spreader-lapper. In practice, this speed is substantially equal to the average speed of the exit belt of the crosslapper during all its operating phases. As a result, during each phase of reversal of the direction of movement of the unwinding means of the crosslapper, the exit belt of the crosslapper is slowed down, then is accelerated temporarily with respect to the speed of entry downstream machine. These repeated speed variations result in temporary stretching and condensation successions of the fibrous web at the inlet of the downstream machine, which can be detrimental to the weight regularity of the web and its quality. In particular, the successive stretches experienced by the web can result detrimentally to an uncontrolled change in the relative orientation of the layers of the web. Successive draws can also induce uncontrolled variations in the final width of the web.
Egalement, la structure multicouche et non consolidée (les couches ne sont pas liées entre elles) de la nappe en sortie d'étaleur-nappeur rend la manipulation de cette nappe contraignante. En particulier, il faut veiller à éviter les phénomènes de retournement de couches supérieures lors du transport de la nappe avant consolidation. Egalement, les taux d'étirages doivent être limités et constants dans le temps, afin de ne pas risquer un délaminage des couches de la nappe.Also, 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. In particular, care must be taken to avoid the phenomena of reversal of the upper layers during transport of the web before consolidation. Also, the stretching rates must be limited and constant over time, so as not to risk delamination of the layers of the sheet.
On connaît également par la demande de brevet américain
Dans la première variante de réalisation de la
Cette première variante de réalisation du dispositif tampon décrit dans la publication
Dans une deuxième variante de réalisation de la
En fonctionnement, la bande de non-tissé est transportée par la première bande de transport jusqu'à la bande accumulatrice et est transférée par ladite bande accumulatrice jusqu'à la deuxième bande de transport. Plus précisément, la bande de non-tissé est transportée sur une première portion verticale entre la première bande de transport et la bande accumulatrice puis, après retournement, est transportée sur une deuxième portion verticale, entre ladite bande accumulatrice et la deuxième bande de transport. La bande de non-tissé est ensuite acheminée par la deuxième bande de transport jusqu'à l'entrée de l'étaleur-nappeur.In operation, the nonwoven web is conveyed by the first conveyor belt to the accumulator web and is transferred by said accumulator web to the second conveyor belt. More specifically, the nonwoven web is transported on a first vertical portion between the first conveyor belt and the accumulator strip and, after reversal, is transported on a second vertical portion, between said accumulator strip and the second conveyor belt. The nonwoven web is then conveyed by the second conveyor belt to the entrance of the crosslapper.
Cette deuxième variante de réalisation du dispositif tampon décrite dans la publication
La présente invention vise à proposer un nouveau dispositif ou système tampon qui est disposé en aval d'une machine délivrant une bande de non tissé monocouche ou multicouche avec une vitesse pouvant être variable, et qui permet de compenser le cas échéant lesdites variations de vitesse, sans altérer la structure de bande de non tissé.The present invention aims to propose a new device or buffer system which is disposed downstream of a machine delivering a single-layer or multilayer non-woven strip with a speed that can be variable, and which makes it possible to compensate, if necessary, said speed variations. without altering the nonwoven web structure.
Cet objectif est atteint par l'invention qui a pour objets un système tampon présentant les caractéristiques techniques de la revendication 1 ou de la revendication 7, et un dispositif tampon présentant les caractéristiques techniques de la revendication 14.This object is achieved by the invention which has for object a buffer system having the technical features of
Plus particulièrement, et de manière optionnelle selon l'invention, le système tampon de l'invention peut comporter les caractéristiques techniques additionnelles suivantes, prises isolément ou en combinaison unes avec les autres :
- la bande de transport sans fin amont est enroulée sur des rouleaux de guidage, dont au moins un rouleau de guidage aval au niveau duquel est située la zone de délivrance (Zd) de la bande de transport sans fin amont, et dans lequel les moyens de réglage sont aptes à modifier automatiquement, en fonction du différentiel entre lesdites première V1 (t) et deuxième V2(t) vitesses, au moins la position dudit rouleau de guidage aval ;
- les moyens de réglage sont aptes à modifier automatiquement, en fonction du différentiel entre lesdites première V1 (t) et deuxième V2(t) vitesses, au moins la position en hauteur du rouleau de guidage aval ;
- au moins la position du rouleau de guidage aval est réglable entre une position haute prédéfinie dans laquelle la longueur de parcours de la bande de non-tissé (N) est maximale et une position basse prédéfinie dans laquelle la longueur de parcours de la bande de non-tissé (N) est minimale ;
- au moins la position du rouleau de guidage aval est réglable entre une position basse prédéfinie dans laquelle la longueur de parcours de la bande de non-tissé (N) est maximale et une position haute prédéfinie dans laquelle la longueur de parcours de la bande de non-tissé (N) est minimale.
- la bande de transport sans fin aval est enroulée sur des rouleaux de guidage, dont au moins un rouleau de guidage amont au niveau duquel est située la zone de reprise (Zr) de la bande de transport sans fin amont, et dans lequel les moyens de réglage sont aptes à modifier automatiquement, en fonction du différentiel entre lesdites première V1(t) et deuxième V2(t) vitesses, au moins la position dudit rouleau de guidage amont ;
- les moyens de réglage sont aptes à modifier automatiquement, en fonction du différentiel entre lesdites première V1 (t) et deuxième V2(t) vitesses, au moins la position en hauteur du rouleau de guidage amont ;
- les moyens de réglage sont aptes à déplacer automatiquement la position d'au moins une portion de la bande de transport amont au niveau de sa zone de délivrance (Zd) et/ou la position d'au moins une portion de la bande de transport sans fin aval au niveau de sa zone de reprise (Zr), à une troisième vitesse V3(t), qui est fonction du différentiel entre lesdites première V1(t) et deuxième V2(t) vitesses.
- the upstream endless conveyor belt is wound on guide rollers, including at least one downstream guide roll at which the delivery zone (Zd) of the upstream endless conveyor belt is located, and wherein the setting are able to change automatically, in function of the differential between said first V1 (t) and second V2 (t) speeds, at least the position of said downstream guide roller;
- the adjustment means are adapted to automatically change, as a function of the differential between said first V1 (t) and second V2 (t) speeds, at least the height position of the downstream guide roller;
- at least the position of the downstream guide roller is adjustable between a predefined high position in which the travel length of the nonwoven web (N) is maximum and a predefined low position in which the travel length of the web of no -woven (N) is minimal;
- at least the position of the downstream guide roller is adjustable between a predefined low position in which the travel length of the nonwoven web (N) is maximum and a predefined high position in which the travel length of the web of no -woven (N) is minimal.
- the downstream endless conveyor belt is wound on guide rollers, at least one of which is an upstream guide roll at which the recovery zone (Zr) of the upstream endless conveyor belt is located, and wherein the adjustment are adapted to automatically change, according to the differential between said first V1 (t) and second V2 (t) speeds, at least the position of said upstream guide roller;
- the adjustment means are adapted to automatically change, as a function of the differential between said first V1 (t) and second V2 (t) speeds, at least the height position of the upstream guide roller;
- the adjustment means are able to automatically move the position of at least a portion of the upstream conveyor belt at its delivery zone (Zd) and / or the position of at least a portion of the downstream endless conveyor belt at its recovery zone (Zr), at a third speed V3 (t), which is a function of the differential between said first V1 (t) and second V2 (t) speeds.
Plus particulièrement, et de manière optionnelle, le système tampon de l'invention peut comporter les caractéristiques techniques additionnelles suivantes, prises isolément ou en combinaison unes avec les autres :
- les moyens de réglage sont aptes à modifier automatiquement, en fonction du différentiel entre lesdites première V1 (t) et deuxième V2(t) vitesses, la position en hauteur d'au moins une portion de la surface de transport amont au niveau de sa zone de délivrance (Zd) et/ou la position en hauteur d'au moins une portion de la surface de transport aval au niveau de sa zone de reprise (Zr), de manière à régler automatiquement la longueur de parcours de la bande de non-tissé ; plus particulièrement, les moyens de réglage sont aptes à modifier automatiquement, en fonction du différentiel entre lesdites première V1 (t) et deuxième V2(t) vitesses, l'inclinaison de la surface de transport amont et/ou l'inclinaison de la surface de transport aval, de manière à régler automatiquement la longueur de parcours de la bande de non-tissé.
- le système tampon comprend une bande de transport sans fin aval dont une portion forme ladite surface de transport aval ;
- le système tampon comprend une bande de transport sans fin amont, dont une portion forme ladite surface de transport amont ;
- les moyens de réglage sont aptes à déplacer automatiquement au moins une portion de la surface de transport - aval ou au moins une portion de la surface de transport amont à une troisième vitesse V3(t), qui est fonction du différentiel entre lesdites première V1 (t) et deuxième V2(t) vitesses ;
- les première V1(t), deuxième V2(t) et troisième V3(t) vitesses sont liées par la relation : V3(t) = K.[V1(t) -V2(t) ], où K est une constante prédéfinie
- au moins la position du rouleau de guidage amont est réglable entre une position basse prédéfinie dans laquelle la longueur de parcours de la bande de non-tissé (N) est maximale et une position haute prédéfinie dans laquelle la longueur de parcours de la bande de non-tissé (N) est minimale.
- the adjustment means are able to automatically change, according to the differential between said first V1 (t) and second V2 (t) speeds, the height position of at least a portion of the upstream transport surface at its zone (Zd) and / or the position in height of at least a portion of the downstream transport surface at its recovery zone (Zr), so as to automatically adjust the travel length of the non-contact strip. woven; more particularly, the adjustment means are capable of automatically modifying, as a function of the differential between said first V1 (t) and second V2 (t) speeds, the inclination of the upstream transport surface and / or the inclination of the surface downstream transport, so as to automatically adjust the travel length of the nonwoven web.
- the buffer system comprises a downstream endless conveyor belt, a portion of which forms said downstream transport surface;
- the buffer system comprises an upstream endless transport belt, a portion of which forms said upstream transport surface;
- the adjustment means are able to automatically move at least a portion of the surface of transport - downstream or at least a portion of the upstream transport surface at a third speed V3 (t), which is a function of the differential between said first V1 (t) and second V2 (t) speeds;
- the first V1 (t), second V2 (t) and third V3 (t) velocities are linked by the relation: V3 (t) = K. [V1 (t) -V2 (t)], where K is a predefined constant
- at least the position of the upstream guide roller is adjustable between a predefined low position in which the travel length of the nonwoven web (N) is maximum and a predefined high position in which the travel length of the web of no -woven (N) is minimal.
L'invention a pour autre objet un système de production en continu d'une bande de non-tissé présentant les caractéristiques techniques de la revendication 25 ou de la revendication 29.Another object of the invention is a system for continuously producing a nonwoven web having the technical features of
D'autres caractéristiques et avantages de l'invention apparaîtront plus clairement à la lecture de la description détaillée ci-après de plusieurs variantes de réalisation de l'invention, laquelle description est donnée à titre d'exemple non limitatif et non exhaustif de l'invention, et en référence aux dessins annexés sur lesquels :
- la
figure 1 est une vue schématique de côté d'un système de production d'une nappe fibreuse multicouche mettant en oeuvre un dispositif tampon conforme à une première variante de réalisation de l'invention, - la
figure 2 est une vue arrière du dispositif tampon du système de production de lafigure 1 , - la
figure 3 représente, en perspective, un étaleur-nappeur de l'art antérieur, pouvant être utilisé en amont du dispositif tampon dans le système de production de lafigure 1 , - la
figure 4 représente deux exemples de profil de vitesse linéaire V1(t), et un exemple de profil de vitesse linéaire V2(t), - la
figure 5 est une vue schématique de côté d'un système de production d'une nappe fibreuse multicouche mettant en oeuvre un dispositif tampon conforme à une deuxième variante de réalisation de l'invention, - la
figure 6 est une vue arrière du dispositif tampon du système de production de lafigure 5 , - la
figure 7 est une vue schématique de côté d'un système tampon conforme à une troisième variante de réalisation de l'invention, - la
figure 8 est une vue schématique de côté d'un système tampon conforme à une quatrième variante de réalisation de l'invention, - la
figure 9 est une vue schématique de côté d'un système tampon conforme à une cinquième variante de réalisation de l'invention.
- the
figure 1 is a schematic side view of a system for producing a multilayer fibrous sheet employing a buffer device according to a first embodiment of the invention, - the
figure 2 is a rear view of the buffer of the production system of thefigure 1 , - the
figure 3 represents, in perspective, a crosslapper of the prior art, which can be used upstream of the buffer device in the production system of thefigure 1 , - the
figure 4 represents two examples of linear velocity profile V1 (t), and an example of linear velocity profile V2 (t), - the
figure 5 is a schematic side view of a system for producing a multilayer fibrous sheet employing a buffer device according to a second variant embodiment of the invention, - the
figure 6 is a rear view of the buffer of the production system of thefigure 5 , - the
figure 7 is a schematic side view of a buffer system according to a third embodiment of the invention, - the
figure 8 is a schematic side view of a buffer system according to a fourth embodiment of the invention, - the
figure 9 is a schematic side view of a buffer system according to a fifth embodiment of the invention.
On a représenté sur les
Dans les exemples particuliers illustrés sur les figures, la machine de traitement aval 3 est constituée par un étireur à rouleaux. Dans d'autres variantes de réalisation de l'invention (non représentées), l'étireur à rouleaux 3 peut être remplacé par une ou plusieurs machines en ligne ayant d'autres fonctionnalités, et par exemple par une machine de consolidation (connue en soi) de la structure de la nappe fibreuse multicouche N; la machine de consolidation peut par exemple permettre une consolidation de type hydraulique (mise en oeuvre de jets d'eau), ou de type mécanique (aiguilletage ou calandrage à froid), ou de type thermomécanique (thermoliage par calandrage à chaud). Il est également possible de prévoir, par exemple, en aval du dispositif tampon 2, une machine de consolidation suivie d'un dispositif d'étirage.In the particular examples illustrated in the figures, the
Le dispositif tampon 2 décrit ci-après en détail est compact et facilement intégrable dans des lignes existantes entre deux machines amont 1 et aval 3. Il permet en outre avantageusement de transférer une nappe fibreuse N non consolidée qui peut être épaisse, sans faire subir de modification notable à la structure de la nappe, et notamment sans compression de la nappe. Ce dispositif tampon 2 peut également être utilisé pour transférer des nappes fibreuses N de grande de largeur.The
L'étaleur-nappeur 1 est connu en soi et sa structure ne sera donc pas détaillée. Pour une compréhension complète de la structure et du fonctionnement de l'étaleur-nappeur 1, l'homme du métier peut se référer par exemple au texte de la demande de brevet internationale
Pour la formation de la nappe N, l'étaleur-nappeur 1 comporte de manière usuelle un chariot inférieur (non représenté) de dévidage du voile W sur la surface de formation 11a. Ce chariot est mobile en translation, et est équipé de moyens d'entraînement motorisés permettant de le déplacer en translation alternativement dans deux directions opposées D et G.For the formation of the web N, the spreader-
En fonctionnement, ce chariot est animé d'un mouvement de translation aller-retour selon les directions opposées D et G, de manière à déposer le voile non-tissé W sur la surface de formation 11 a en le repliant alternativement sur lui-même. En sortie S de l'étaleur-nappeur 1, on obtient ainsi une nappe de non-tissé multicouche N épaisse et non consolidée, formée d'une pluralité de plis P transversaux et alternés se chevauchant en V dans la direction de déplacement K de la surface 11 a de formation de la nappe.In operation, this carriage is driven with a translational movement back and forth in opposite directions D and G, so as to deposit the nonwoven web W on the forming
Cette nappe N est transportée en sortie de l'étaleur-nappeur 1 par la bande de transport 11 à une vitesse linéaire V1 (t) jusqu'à une zone de délivrance Zd de la surface de transport 11 a, au niveau de laquelle la nappe de non-tissé N quitte la surface de transport 11 a et est transférée à l'entrée du dispositif tampon 2. Cette zone de délivrance Zd est située à la périphérie du rouleau de guidage aval 12.This sheet N is conveyed at the output of the
De manière usuelle, la vitesse V1(t) de la bande de transport 11 n'est pas constante, mais varie de manière cyclique en synchronisme avec la vitesse de déplacement du chariot de dévidage précité de l'étaleur-nappeur. On a représenté sur la
Par exemple, en référence à la courbe C1, la vitesse linéaire V1(t) varie de manière sinusoïdale dans le temps, entre une vitesse maximale Vmax et une vitesse minimale Vmin qui, dans le cas particulier de la courbe C1, est nulle. Ainsi le déplacement de la surface de formation 11a est discontinu. Lorsque le chariot de dévidage est à l'arrêt dans sa position de fin de course, avant inversion de son sens de déplacement, la bande de transport de sortie 11 de l'étaleur-nappeur est également arrêtée temporairement (Vmin =0).For example, with reference to the curve C1, the linear speed V1 (t) varies sinusoidally in time, between a maximum speed Vmax and a minimum speed Vmin which, in the particular case of the curve C1, is zero. Thus the displacement of the forming
La courbe C2 illustre un autre profil de vitesse linéaire V1 (t) cyclique de type sinusoïdal, qui est centré sur la même valeur moyenne de vitesse que le profil de vitesse C1, mais pour lequel la valeur maximale Vmax est plus faible et la valeur minimale Vmin n'est pas nulle.Curve C2 illustrates another linear velocity profile V1 (t) cyclic sinusoidal type, which is centered on the same average speed value as the speed profile C1, but for which the maximum value Vmax is lower and the minimum value Vmin is not zero.
En sortie de l'étaleur-nappeur 1, la nappe N est reprise par le dispositif tampon 2, qui permet d'adapter automatiquement la longueur de parcours de la nappe de manière à compenser automatiquement les variations de vitesse V1 (t) de la nappe fibreuse N en sortie de l'étaleur-nappeur 1, et à transférer la nappe N à l'entrée de la machine de traitement aval 3 à une vitesse prédéfinie V2(t) comprise entre les valeurs maximale Vmax et minimale Vmin de la vitesse linéaire V1(t). De préférence, en référence à la
Le dispositif tampon 2 comprend à cet effet:
- un transporteur à bande 20, qui permet de réceptionner (zone de reprise Zr) la nappe N en sortie de la bande de
transport 11, et qui permet de transporter la nappe N jusqu'à lamachine aval 3 à ladite vitesse linéaire V2(t) prédéfinie, - des moyens de réglage 21 permettant de régler automatiquement la position en hauteur de la zone de reprise Zr du transporteur à bande 20 en fonction du différentiel entre lesdites première V1(t) et deuxième V2(t) vitesses linéaires, de manière à régler automatiquement la longueur de parcours de la bande de non-tissé.
- a
belt conveyor 20, which makes it possible to receive (zone of recovery Zr) the sheet N at the exit of theconveyor belt 11, and which makes it possible to transport the sheet N to thedownstream machine 3 at said linear speed V2 (t ) predefined, - adjustment means 21 for automatically adjusting the height position of the recovery zone Zr of the
belt conveyor 20 as a function of the differential between said first V1 (t) and second V2 (t) linear speeds, so as to automatically adjust the travel length of the nonwoven web.
La bande de transport aval 11, le transporteur à bande amont 20 et les moyens de réglage 21 forment un système tampon conforme à l'invention.The
Plus particulièrement, dans l'exemple illustré sur les
De préférence, le moteur ou moto-réducteur M2 du rouleau 201 est asservi en vitesse de telle sorte que la vitesse linéaire précitée V2(t) est sensiblement égale à la vitesse moyenne de la vitesse linéaire V1 (t) de la bande de transport 11 de l'étaleur-nappeur N.Preferably, the motor or geared motor M2 of the
Le transporteur à bande 20 est articulé en rotation autour de l'axe du rouleau moteur 201, de manière à permettre un réglage de l'inclinaison du transporteur à bande 20, et de ce fait de manière à permettre un réglage de la position en hauteur du rouleau de guidage amont 202, et par là-même de la position en hauteur de la zone de reprise Zr de la bande de transport 200.The
Plus particulièrement, les moyens de réglage 21 de la position en hauteur de la zone de reprise Zr du transporteur à bande 20 comprennent, selon la première variante de réalisation de l'invention représentée aux
Plus particulièrement, les moyens de réglage 21 comportent deux ensembles de levage 210 positionnés respectivement de part et d'autre de la bande de transport 200. Le ou les ensembles de levage 210 sont motorisés au moyen d'un moteur ou moto-réducteur M3 (
Plus particulièrement, le moteur ou moto-réducteur M3 est piloté de telle sorte que la vitesse linéaire V3(t) est liée aux vitesses linéaires V1(t), V2(t) par la relation V3(t) = K.[V1 (t) - V2(t)], où K est une constante prédéfinie qui dépend notamment de la distance entre les ensembles de levage 210 et le rouleau 201 (axe de pivotement du transporteur à bande), de la longueur du transporteur à bande 20, du coefficient de réduction du moto-réducteur M3, et du diamètre des poulies 210a.More particularly, the motor or geared motor M3 is driven so that the linear speed V3 (t) is related to the linear velocities V1 (t), V2 (t) by the relation V3 (t) = K. [V1 (t) t) - V2 (t)], where K is a predefined constant which depends in particular on the distance between the lifting
En fonctionnement, la nappe N est transportée à l'entrée du dispositif tampon 2 avec une vitesse linéaire V1 (t) qui varie cycliquement dans le temps, avec par exemple l'un des profils sinusoïdaux de la
Plus particulièrement, lorsque la vitesse linéaire V1 (t) de la nappe fibreuse en sortie de l'étaleur-nappeur 1 est égale à la vitesse linéaire V2(t) de la bande de transport 200 du dispositif tampon 2, la bande de transport 200 est en position haute (
De préférence, mais non nécessairement, en position haute, la zone de reprise Zr de la bande de transport 200 est située sensiblement à la même hauteur et dans le prolongement de la surface du brin supérieur 11a de la bande de transport 11 de la machine amont 1 (étaleur-nappeur).Preferably, but not necessarily, in the high position, the recovery zone Zr of the
Optionnellement, le dispositif tampon 2 peut comprendre un ou plusieurs vérins 203 (visibles uniquement sur la
Dans une deuxième variante de réalisation du dispositif tampon 2 représenté aux
Dans le cadre de l'invention, le transporteur à bande aval 11 peut être remplacé par tout autre moyen de transport présentant une surface de transport apte à transporter une bande de non-tissé à une vitesse V1 (t). En particulier, le transporteur à bande aval 11 peut être remplacé par un cylindre de transport. Le transporteur à bande 20 peut être remplacé par tout autre moyen de transport équivalent permettant une reprise d'une nappe N à une hauteur réglable automatiquement et permettant de transporter la nappe à une vitesse linéaire V2(t) prédéfinie. En particulier, pour le réglage en hauteur de la zone de reprise Zr de la nappe, le transporteur à bande 20 ou équivalent n'est pas nécessairement à inclinaison variable, mais peut par exemple être conçu pour être déplacé en translation verticalement dans son ensemble, c'est-à-dire y compris le rouleau moteur 201. La bande de transport 200 peut être enroulée sur un nombre plus important de rouleaux de guidage. La bande de transport 200 peut être remplacée par au moins un cylindre de transport dont la position en hauteur est réglable. Le dispositif tampon 2 peut comporter plusieurs bandes de transport successives ou équivalent, seule la bande de transport amont à l'entrée du dispositif tampon 2 étant par exemple à inclinaison variable, en sorte de régler la hauteur de sa zone de reprise Zr de la nappe.In the context of the invention, the
On a représenté sur la
Plus particulièrement, les moyens de réglage 22 comportent un moteur ou moto-réducteur M3 qui permet d'entraîner en rotation l'une des poulies 220a de chaque ensemble 210 à une vitesse de rotation Ω3(t) prédéfinie, de manière à lever ou abaisser en rotation le transporteur à bande 20 à la vitesse linéaire précitée V3(t).More particularly, the adjustment means 22 comprise a motor or geared motor M3 which makes it possible to drive in rotation one of the
Plus particulièrement, le moteur ou moto-réducteur M3 est piloté de telle sorte que la vitesse linéaire V3(t) est liée aux vitesses linéaires V1(t), V2(t) par la relation V3(t) = K.[V1 (t) - V2(t)], où K est une constante prédéfinie.More particularly, the motor or geared motor M3 is driven so that the linear speed V3 (t) is related to the linear velocities V1 (t), V2 (t) by the relation V3 (t) = K. [V1 (t) t) - V2 (t)], where K is a predefined constant.
En fonctionnement, la nappe N est transportée à l'entrée du dispositif tampon 2 avec une vitesse linéaire V1(t) qui varie cycliquement dans le temps, avec par exemple l'un des profils sinusoïdaux de la
Dans la variante de la
On a représenté sur la
On a représenté sur la
Plus particulièrement, le système tampon de la
L'invention n'est pas limitée à l'utilisation d'un dispositif ou système tampon en sortie d'un étaleur-nappeur, mais peut être avantageusement utilisée en sortie de tout dispositif ou machine amont 1 délivrant d'une manière générale une bande de non-tissé à une vitesse non constante. La bande de non-tissé n'est pas nécessairement une nappe fibreuse multicouche épaisse non consolidée, telle que la nappe N obtenue en sortie d'un étaleur-nappeur 1, mais peut être également un voile fibreux non-tissé ou une superposition de voiles fibreux non-tissé.The invention is not limited to the use of a device or buffer system at the output of a crosslapper, but may advantageously be used at the output of any upstream device or
Claims (36)
- Buffer system for nonwoven web, said system comprising at least one upstream transport surface (11) and at least one downstream transport surface (20), which are arranged in relation to one another in such a manner that the upstream transport surface is suitable for transporting a nonwoven web (N) at a first linear speed V1 (t) as far as a delivery zone (Zd), at the level of which the nonwoven web (N) leaves the upstream transport surface and is transferred to a take-up zone (Zr) of the downstream transport surface, said downstream transport surface being suitable for transporting the nonwoven web at a predefined second linear speed V2(t), which can differ from the first linear speed V1(t), characterised in that said buffer system also comprises regulating means (21) suitable for automatically modifying, as a function of the difference between said first V1(t) and second V2(t) speeds, the distance between the delivery zone (Zd) of the upstream transport surface and the take-up zone (Zr) of the downstream transport surface, so as automatically to regulate the path length of the nonwoven web.
- Buffer system according to claim 1, in which the regulating means (21) are suitable for automatically moving at least one portion of the downstream transport surface or at least one portion of the upstream transport surface at a third speed V3(t), which is a function of the difference between said first V1(t) and second V2(t) speeds.
- Buffer system according to claim 1 or 2, including at least one continuous upstream transport web (11; 11') forming said upstream transport surface and at least one continuous downstream transport web (20) forming said downstream transport surface, which are arranged in relation to one another in such a manner that the continuous upstream transport web is suitable for transporting a nonwoven web (N) at a first linear speed V1 (t) as far as the delivery zone (Zd), at the level of which the nonwoven web (N) leaves the continuous upstream transport web and is transferred to a take-up zone (Zr) of the continuous downstream transport web, said continuous downstream transport web being suitable for transporting the nonwoven web at a predefined second linear speed V2(t), which can differ from the first linear speed V1(t), the regulating means (21; 22) being suitable for automatically modifying, as a function of the difference between said first V1(t) and second V2(t) speeds, the position of at least one portion of the upstream transport web at the level of its delivery zone (Zd) and/or the position of at least one portion of the continuous downstream transport web at the level of its take-up zone (Zr), so as automatically to regulate the path length of the nonwoven web.
- Buffer system according to claim 3, in which the continuous upstream transport web is wound on guide rollers, which include at least one downstream guide roller (12; 12'), at the level of which the delivery zone (Zd) of the continuous upstream transport web is situated, and in which the regulating means are suitable for automatically modifying, as a function of the difference between said first V1(t) and second V2(t) speeds, at least the position of said downstream guide roller.
- Buffer system according to claim 4, in which the regulating means are suitable for automatically modifying, as a function of the difference between said first V1(t) and second V2(t) speeds, at least the height position of the downstream guide roller (12).
- Buffer system according to any of claims 3 to 5, in which the continuous downstream transport web is wound on guide rollers, which include at least one upstream guide roller (202), at the level of which the take-up zone (Zr) of the continuous upstream transport web is situated, and in which the regulating means are suitable for automatically modifying, as a function of the difference between said first V1(t) and second V2(t) speeds, at least the position of said upstream guide roller.
- Buffer system according to claim 6, in which the regulating means are suitable for automatically modifying, as a function of the difference between said first V1 (t) and second V2(t) speeds, at least the height position of the upstream guide roller (202).
- Buffer system according to any of claims 3 to 7, in which the regulating means (21; 22) are suitable for automatically moving the position of at least one portion of the continuous upstream transport web (11,11') at the level of its delivery zone (Zd) and/or the position of at least one portion of the continuous downstream transport web (20) at the level of its take-up zone (Zr), at a third speed V3(t), which is a function of the difference between said first V1(t) and second V2(t) speeds.
- Buffer system according to any of claims 1 to 8, comprising driving means of the upstream transport surface at a first linear speed V1(t) that varies in a cyclic manner.
- Buffer system according to any of claims 1 to 9, in which the downstream transport surface is suitable for driving the nonwoven web at a second linear speed V2(t), which is comprised between the minimum value Vmin and the maximum value Vmax of the first linear speed V1(t).
- Buffer system according to claim 10, in which the second linear speed V2(t) is essentially equal to the average value of the first linear speed V1(t),
- Buffer system according to any of claims 1 to 11, in which the downstream transport surface is suitable for driving the nonwoven web (N) at a second linear speed V2(t), which is constant.
- Buffer system according to any of claims 1 to 12, in which the downstream transport surface is suitable for driving the nonwoven web at a second linear speed V2(t), which is essentially equal to the average value of the first linear speed V1(t).
- Buffer system according to claim 2 or 8, in which the first V1(t), second V2(t) and third V3(t) speeds are linked by the formula: V3(t) = K.[V1 (t) - V2(t)], where K is a predefined constant.
- Buffer device (2), destined to be supplied with a nonwoven web (N), which moves forward at a predefined first linear speed V1(t) that can be non-constant, characterised in that it comprises transport means (20) including a take-up zone (Zr) of the nonwoven web and enables the nonwoven web to be transported at a predefined second linear speed V2(t), which can differ from the first linear speed V1(t), and regulating means (21) suitable for automatically regulating the height position of the take-up zone (Zr) of the transport means (20) as a function of the difference between said first V1(t) and second V2(t) speeds, so as automatically to regulate the path length of the nonwoven web.
- Device according to claim 15, in which the transport means (20) include a transport surface (200) at a variable inclination and in which the regulating means are suitable for automatically regulating the inclination of the transport surface.
- Device according to claim 15 or 16, in which the transport means (20) include a continuous transport web (200) and driving means (201, M2) of said transport web at said predefined second linear speed V2(t).
- Device according to any of claims 15 to 17, in which the transport means (20) are suitable for driving the nonwoven web at a second linear speed V2(t), which is comprised between the minimum value Vmin and the maximum value Vmax of the first linear speed V1(t).
- Device according to any of claims 15 to 18, in which the transport means (20) are suitable for driving the nonwoven web (N) at a second linear speed V2(t), which is constant.
- Device according to any of claims 15 to 19, in which the transport means (20) are suitable for driving the nonwoven web at a second linear speed V2(t), which is essentially equal to the average value of the first linear speed V1(t).
- Device according to any of claims 15 to 20, in which the regulating means (21) are suitable for raising or lowering the take-up zone (Zr) of the transport means (20) at a third speed V3(t), which is a function of the difference between said first V1(t) and second V2(t) speeds.
- Device according to any of claims 15 to 21, in which the regulating means (21) regulating the height position of the take-up zone (Zr) of the transport means include a motorised pulley (210a)-belt (210b) system enabling the transport means (20) to be raised or lowered.
- Device according to any of claims 15 to 22, in which the regulating means (21) regulating the height position of the take-up zone (Zr) of the transport means (20) include at least one jack (211) enabling the transport means (20) to be raised or lowered.
- Device according to any of claims 15 to 23, including one or several jacks (203) supporting the transport means (20).
- Buffer device according to claim 21, in which the first V1(t), second V2(t) and third V3(t) speeds are linked by the formula: V3(t) = K.[V1(t) - V2(t)], where K is a predefined constant.
- Continuous nonwoven web production system, said system comprising an upstream machine (1) designed to deliver at the exit a nonwoven web (N) at a first linear speed V1(t), and a buffer device (2), which is positioned at the exit of this upstream machine and which features the characteristics of the device referred to in one of claims 15 to 25.
- System according to claim 26, in which the upstream machine (1) includes at the exit a continuous transport web (11).
- System according to claim 26 or claim 27, in which the profile of the first linear speed V1 (t) varies in a cyclic manner.
- System according to any of claims 26 to 28, in which the upstream machine (1) includes at the exit a transport surface (11a) and in which, at the maximum height position of the transport means (20) of the buffer device (2), the take-up zone (Zr) of the transport means (20) is situated at essentially the same height and in line with said transport surface (11a) of the upstream machine.
- Production system according to any of claims 25 to 29, in which the upstream machine (1) is a crosslapper.
- Production system according to any of claims 25 to 30, also comprising a treatment machine (3) positioned downstream of the buffer device (2) and in which the linear speed V2(t) is essentially equal to the linear entry speed of the downstream treatment machine.
- System according to claim 31, characterised in that the downstream treatment machine (3) is a drawing roller.
- Continuous nonwoven web production system, said system comprising an upstream machine designed to deliver at the exit a nonwoven web (N) and a buffer system, which is positioned at the exit of this upstream machine and which features the characteristics of the buffer system referred to in any one of claims 1 to 14.
- Production system according to claim 33, in which the upstream machine (1) is a crosslapper.
- Production system according to any of claims 33 or 34, also comprising a treatment machine (3) positioned downstream of the buffer system and in which the linear speed V2(t) is essentially equal to the linear entry speed of the downstream treatment machine.
- System according to claim 35, characterised in that the downstream treatment machine (3) is an equipment comprising drafting rolls.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0802376A FR2930563B1 (en) | 2008-04-28 | 2008-04-28 | BUFFER DEVICE AND SYSTEM FOR PRODUCING NON-WOVEN WEB |
Publications (4)
Publication Number | Publication Date |
---|---|
EP2128314A2 EP2128314A2 (en) | 2009-12-02 |
EP2128314A3 EP2128314A3 (en) | 2010-01-20 |
EP2128314B1 EP2128314B1 (en) | 2011-03-09 |
EP2128314B9 true EP2128314B9 (en) | 2011-09-07 |
Family
ID=40019271
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09370008A Revoked EP2128314B9 (en) | 2008-04-28 | 2009-04-28 | Buffer device or system and system for producing a non-woven strip |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2128314B9 (en) |
AT (1) | ATE501288T1 (en) |
DE (1) | DE602009000824D1 (en) |
FR (1) | FR2930563B1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017102468A1 (en) * | 2017-02-08 | 2018-08-09 | TRüTZSCHLER GMBH & CO. KG | Storage table for a nonwoven layer and method for operating a storage table |
CN114683672A (en) * | 2022-04-24 | 2022-07-01 | 北京量子金舟无纺技术有限公司 | Elastic non-woven fabric production system |
FR3138154A1 (en) | 2022-07-25 | 2024-01-26 | Andritz Asselin-Thibeau | Buffer device for adapting the exit speed of a web from a lapper spreader to the entry speed of a web treatment device downstream of the lapper spreader |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2234395B1 (en) | 1973-06-19 | 1976-09-17 | Asselin Robert | |
US5289617A (en) | 1991-06-03 | 1994-03-01 | Asselin (Societe Anonyme) | Spreading and lap-forming machine |
DE9212215U1 (en) * | 1992-09-10 | 1994-01-13 | Autefa Maschinenfabrik GmbH, 86316 Friedberg | Device for producing a nonwoven from fiber material |
FR2791364B1 (en) | 1999-03-23 | 2001-06-08 | Asselin | SPREADER |
EP1381721B1 (en) * | 2001-04-23 | 2006-06-07 | AUTEFA automation GmbH | Method for profiling a nonwoven fabric and profile forming device |
DE10139833A1 (en) * | 2001-08-14 | 2003-02-27 | Dilo Kg Maschf Oskar | Method and device for producing a nonwoven fabric |
FR2905684A1 (en) * | 2006-09-11 | 2008-03-14 | Asselin Thibeau Soc Par Action | METHOD AND SYSTEM FOR PRODUCING A MULTILAYER TABLE, IN PARTICULAR BY MEANS OF A CALIPER. |
-
2008
- 2008-04-28 FR FR0802376A patent/FR2930563B1/en active Active
-
2009
- 2009-04-28 EP EP09370008A patent/EP2128314B9/en not_active Revoked
- 2009-04-28 DE DE602009000824T patent/DE602009000824D1/en active Active
- 2009-04-28 AT AT09370008T patent/ATE501288T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EP2128314B1 (en) | 2011-03-09 |
FR2930563A1 (en) | 2009-10-30 |
ATE501288T1 (en) | 2011-03-15 |
FR2930563B1 (en) | 2010-04-30 |
DE602009000824D1 (en) | 2011-04-21 |
EP2128314A2 (en) | 2009-12-02 |
EP2128314A3 (en) | 2010-01-20 |
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