EP3592887B1 - Cross-lapper - Google Patents

Cross-lapper Download PDF

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Publication number
EP3592887B1
EP3592887B1 EP18707066.9A EP18707066A EP3592887B1 EP 3592887 B1 EP3592887 B1 EP 3592887B1 EP 18707066 A EP18707066 A EP 18707066A EP 3592887 B1 EP3592887 B1 EP 3592887B1
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EP
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Prior art keywords
cross
lapper
roller
rotation
web
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EP18707066.9A
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German (de)
French (fr)
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EP3592887A1 (en
Inventor
Hugues Leroy
Thierry PERDRIX
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Andritz Asselin Thibeau SAS
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Andritz Asselin Thibeau SAS
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Publication of EP3592887A1 publication Critical patent/EP3592887A1/en
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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

Definitions

  • the present invention relates to a crosslapper.
  • a crosslapper is supplied with a web of fibers, in particular of nonwoven, for example from a web production device, for example a card, to form at the output of the crosslapper a web of fibers , in particular of nonwoven, comprising superimposed layers consisting of sections of the web which have been superimposed on each other in a zig-zag fashion on an outlet apron of the crosslapper.
  • Crosslappers are known for example from EP1870499 , EP1686205 And EP2365113 .
  • a consolidation step in particular by needling, can be carried out.
  • the web from the web production device is deposited on an entry belt (or front belt) of the crosslapper.
  • the crosslapper also comprises a rear belt which defines with the front belt a transport path to a lapping slot into which a section of accumulated web is inserted by means of an entry carriage called an accumulator carriage .
  • the section accumulated by the accumulator carriage is supplied to the lapping slot and is deposited on the outlet apron of the crosslapper by a lapping carriage.
  • the veil made up of mainly longitudinal fibres, loosely bonded together and forming a very airy structure, has a low mechanical strength. He however, it is important that, during its passage through the crosslapper, the web retains as faithfully as possible its initial dimensioning and in particular its initial width and a uniform distribution of its weight (or basis weight) over its width. However, at one stage in the path of the veil, the latter is turned over, the front carpet performing a half-turn to start again in the opposite direction and the rear carpet taking over after the reversal to carry out the function of supporting the veil.
  • the invention thus relates, according to a first aspect of the invention, to a crosslapper as defined in claim 1, improvements and preferred embodiments being defined in the subclaims.
  • the veil is protected, thanks to this overpressure, from the effects adverse effects of the combined action of the centrifugal force exerted on the veil during its reversal and the relative air flow induced by the backward movement of the accumulator carriage during the reversal of the veil, which promotes the uniformity of the final ply in out of the crosslapper.
  • a crosslapper intended to supply at the output a web of fibers from a veil of fibers supplied at the input , the crosslapper carrying out the superposition of sections of the veil to form the sheet at the output and comprising a front belt, a rear belt and turning means intended to turn the fiber veil to make it pass from a state in which it is supported by the front carpet in a state in which it is supported by the rear carpet, is characterized in that it is arranged, substantially above the turn-up region where the turn-up of the web takes place, an element driven in rotation, for example a roller or cylinder driven in rotation, the arrangement being such that the outer surface of the rotating element, in particular of the rotating roller, is in direct communication for fluids, in particular air, with the zone turning, in particular without the interposition of a carpet.
  • the rotating element is not a drive element for the front belt and/or the rear belt.
  • the crosslapper carrying out the superposition of sections of the veil to form the sheet at the outlet and comprising a front belt, a rear belt and turning means intended to turn the fiber veil to passing it from a state in which it is supported by the front carpet to a state in which it is supported by the rear carpet is characterized in that it is arranged, substantially above the turnaround region where the The veil is turned over, an element driven in rotation, for example a roller or cylinder driven in rotation, the rotary element, in particular the rotary roller, being driven by a motor.
  • a crosslapper for outputting a web of fibers from a web of fibers supplied at the input, the crosslapper carrying out the superposition of sections of the web to form the web at the output and comprising a front conveyor, a rear conveyor and turning means intended to turn the web of fibers over to make it pass from from a state in which it is supported by the front carpet to a state in which it is supported by the rear carpet, is characterized in that it is arranged, substantially above the turn-up region where the turn-up of the web is performs an element driven in rotation, for example a roller or cylinder driven in rotation, and the crosslapper comprises a first carriage, or accumulator carriage, and a second carriage, or lapper carriage, the turning zone being located in the accumulator carriage, and the rotary element, in particular the rotary roller, is integral with the accumulator carriage, in particular is arranged inside the latter.
  • a crosslapper for outputting a web of fibers from a web of fibers supplied at the input, the crosslapper carrying out the superposition of sections of the web to form the web at the output and comprising a front conveyor, a rear conveyor and turning means intended to turn the web of fibers over to make it pass from from a state in which it is supported by the front carpet to a state in which it is supported by the rear carpet, is characterized in that it is arranged, substantially above the turn-up region where the turn-up of the web is performs, an element driven in rotation, for example a roller or cylinder driven in rotation, and the rotating element, in particular the rotating roller, has shapes and dimensions such that it creates an air flow having a high Reynolds coefficient , in particular greater than 8,000 and in particular between 10,000 and 100,000.
  • a crosslapper for outputting a web of fibers from a web of fibers supplied at the input, the crosslapper carrying out the superposition of sections of the veil to form the sheet at the output and comprising a front belt, a rear belt and turning means intended to return the veil of fibers to make it pass from a state in which it is supported by the front carpet to a state in which it is supported by the rear carpet, is characterized in that it is arranged, substantially above above the turning region where the turning of the veil takes place, a roller or cylinder driven in rotation, and the roller is of the fluted type.
  • the grooves extend parallel to the axis of rotation of the roller.
  • a crosslapper for outputting a web of fibers from a web of fibers supplied at the input, the crosslapper carrying out the superposition of sections of the web to form the web at the output and comprising a front conveyor, a rear conveyor and turning means intended to turn the web of fibers over to make it pass from from a state in which it is supported by the front carpet to a state in which it is supported by the rear carpet, is characterized in that it is arranged, substantially above the turn-up region where the turn-up of the web is performs, an element driven in rotation, for example a roller or cylinder driven in rotation, the rotary element, in particular the rotary roller, being driven by a motor and the control of the motor driving the rotary element, in particular the roller, is made in such a way as to give the rotating element, in particular the roller, a speed of rotation proportional to the speed at which the web enters the accumulator carriage.
  • an element driven in rotation for example a roller or cylinder driven in rotation
  • the rotary element in particular the
  • a crosslapper intended to output a web of fibers from a web of fibers supplied at the input, the crosslapper carrying out the superimposition of sections of the web to form the web at the output and comprising a front belt, a rear belt and turning means intended to turn the fibers to change it from a state in which it is supported by the front mat to a state in which it is supported by the rear mat, is characterized in that it is arranged substantially above the turning region where the reversal of the veil takes place, an element driven in rotation, for example a roller or cylinder driven in rotation, the rotary element, in particular the rotary roller, being driven by a motor and the control of the drive motor of the
  • the rotary element, in particular of the roller is made in such a way as to give the rotary element, in particular of the roller, a speed of rotation proportional to the speed of entry of the web into the
  • the turn-up zone or region can be defined, in cross-section with respect to the transverse axis of the mats, by the space delimited by the part of the front mat in contact with the veil while the latter is under the carpet, by the part of the rear carpet which is not in contact with the veil and by a pinch constituting an entry opening on the top of the region, the pinch being at the level where the front carpet ceases to support the sail.
  • the rotating element is directly above the pinch.
  • the turning means comprise a diverting roller.
  • the present invention also relates to an installation comprising a web-forming device, for example a card, a lapping spreader according to the invention, fed by the web-forming device, and a device for consolidating the web formed by the web.
  • lapper spreader arranged after the lapper spreader, for example a needle loom.
  • FIG. 1 schematically represents an exemplary embodiment of a crosslapper according to the invention.
  • a fleece transfer occurs between two mats.
  • the veil 1 arrives continuously on a first endless carpet 2, called the front carpet, then enters an entry carriage moving back and forth where it undergoes a reversal by performing a U-turn to be taken up by a second carpet 4 endless, say back mat.
  • the veil 1 is conveyed between the two belts 2 and 4.
  • the veil thus maintained is then taken up by a second mobile exit carriage, or lapper, whose function is to spread the veil in back and forth on a continuously moving exit apron transversely, in particular perpendicularly, to the movement of the lapper carriage 5, so as to form a lap consisting of staggered folds.
  • the front belt 2 is guided by guide rollers 7 and 3 carried by the mobile entry carriage defining an inclined section 9 so that the veil 1 transported by this belt performs a U-turn around the second roller 3, however slightly less than 180°.
  • the path of the rear belt 4 is defined by four rollers 10, 11, 12 and 13 carried by the entry carriage and arranged so that a nip line 14 is provided between the guide roller 3 of the front carpet 2 around which the veil performs its U-turn and the roller 12 guiding the rear carpet 4, and so that the rear carpet 4 passes close to the roller 3 to support the support of the veil at the exit of roll 3.
  • a roller 20 driven in rotation with respect to an axis parallel to the axis of roller 3, is arranged above roller 3 in the inlet carriage, being integral with the inlet carriage.
  • the roller 20 is located substantially above the zone in which the web 1 performs its reversal, that is to say between the roller 3 and the roller 12.
  • the roller 20 has longitudinal grooves parallel to the axis of rotation of the roller 20.
  • Roller 20 is driven in rotation by a motor (not shown in the figure).
  • the motor is controlled so as to rotate the roller at a speed of rotation proportional to the speed of entry of the veil into the carriage 3, or preferably, proportional to the entry speed of the web into the lapper in order to prevent too sudden speed variations of the roller from allowing the maintenance of the aeraulic phenomenon (Magnus Effect).
  • the roller creates an air flow which has a high Reynolds coefficient, in particular greater than 8,000, for example between 10,000 and 100,000.
  • the turning means consist mainly of the roller 3 for turning, which is a simple solid roller.
  • the roller 3 for turning which is a simple solid roller.
  • the present invention makes it possible, if desired, to dispense with it, a perforated roll, optionally in combination with a perforated mat, the combination of the arrangement of the present invention with such an arrangement of roller and/or perforated carpet to obtain an even stronger hold of the veil (however in this case with an increase in the complexity and cost of the device).
  • the relative arrangement of the two front and rear mats could also be made differently from that described in figure 1 without departing from the scope of protection of the invention.
  • a relative arrangement of the two carpets could be provided as described in EP2365113 or in EP1163383 .
  • the zone or region of reversal is the region delimited by the front and rear mats where the veil 1 is not supported, that is to say carried from below, by at least one of the two mats.
  • this region is the area between the two mats 2 and 4 below of the pinch line 14, the region is defined, in cross-section, corresponding to that of the figure 1 , by a space delimited by the part of the front carpet 2 in contact with the veil while the latter is under the carpet, by the part of the rear carpet 4 which is not in contact with the veil and by the pinch 14 , the latter constituting an entrance opening on the top of the region, the pinch 14 being at the level where the front belt ceases to support the veil.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Nonwoven Fabrics (AREA)

Description

La présente invention se rapporte à un étaleur-nappeur.The present invention relates to a crosslapper.

Classiquement un étaleur-nappeur est alimenté d'un voile de fibres, notamment de non tissé, par exemple issu d'un dispositif de production de voile, par exemple une carde, pour former en sortie de l'étaleur-nappeur une nappe de fibres, notamment de non tissé, comportant des couches superposées constituées de tronçons du voile qui ont été superposés les uns sur les autres en zig-zag sur un tablier de sortie de l'étaleur-nappeur. Des étaleur-nappeurs sont connus par exemple de EP1870499 , EP1686205 et EP2365113 .Conventionally, a crosslapper is supplied with a web of fibers, in particular of nonwoven, for example from a web production device, for example a card, to form at the output of the crosslapper a web of fibers , in particular of nonwoven, comprising superimposed layers consisting of sections of the web which have been superimposed on each other in a zig-zag fashion on an outlet apron of the crosslapper. Crosslappers are known for example from EP1870499 , EP1686205 And EP2365113 .

En général, à la suite de l'étaleur-nappeur, une étape de consolidation, notamment par aiguilletage, peut être réalisée.In general, following the crosslapper, a consolidation step, in particular by needling, can be carried out.

Le voile issu du dispositif de production de voile est déposé sur un tapis d'entrée (ou tapis avant) de l'étaleur-nappeur. L'étaleur-nappeur comporte également un tapis arrière qui définit avec le tapis avant un trajet de transport jusqu'à une fente de nappage dans laquelle est inséré un tronçon du voile accumulé par l'intermédiaire d'un chariot d'entrée dit chariot accumulateur. Le tronçon accumulé par le chariot accumulateur est fourni à la fente de nappage et est déposé sur le tablier de sortie de l'étaleur-nappeur par un chariot nappeur.The web from the web production device is deposited on an entry belt (or front belt) of the crosslapper. The crosslapper also comprises a rear belt which defines with the front belt a transport path to a lapping slot into which a section of accumulated web is inserted by means of an entry carriage called an accumulator carriage . The section accumulated by the accumulator carriage is supplied to the lapping slot and is deposited on the outlet apron of the crosslapper by a lapping carriage.

Le voile, constitué de fibres principalement longitudinales, peu liées entre elles et formant une structure très aérée, a une tenue mécanique faible. Il est important cependant que, pendant son passage dans l'étaleur-nappeur, le voile conserve aussi fidèlement que possible son dimensionnement initial et notamment sa largeur initiale et une répartition uniforme de son poids (ou masse surfacique) sur sa largeur. Or, à une étape du trajet du voile, ce dernier est retourné, le tapis avant effectuant un demi-tour pour repartir en sens inverse et le tapis arrière prenant le relais après le retournement pour réaliser la fonction de support du voile.The veil, made up of mainly longitudinal fibres, loosely bonded together and forming a very airy structure, has a low mechanical strength. He However, it is important that, during its passage through the crosslapper, the web retains as faithfully as possible its initial dimensioning and in particular its initial width and a uniform distribution of its weight (or basis weight) over its width. However, at one stage in the path of the veil, the latter is turned over, the front carpet performing a half-turn to start again in the opposite direction and the rear carpet taking over after the reversal to carry out the function of supporting the veil.

L'inconvénient cependant est que lors du retournement du voile, ce dernier a tendance à se décoller du tapis, notamment lors du mouvement retour du chariot accumulateur, ce qui est préjudiciable à l'homogénéité de la nappe formée en sortie de l'étaleur-nappeur. Pour résoudre ce problème, on a déjà pensé à réduire la vitesse de l'étaleur-nappeur en fonction du type de voile, notamment de sa densité ou du type des fibres. On a également pensé à prévoir un agencement compliqué et coûteux comportant des moyens d'aspiration combinés à un tapis et/ou cylindre perforé.The disadvantage, however, is that when the veil is turned over, the latter tends to come off the belt, in particular during the return movement of the accumulator carriage, which is detrimental to the homogeneity of the sheet formed at the outlet of the spreader. lapper. To solve this problem, consideration has already been given to reducing the speed of the crosslapper depending on the type of web, in particular its density or the type of fibres. Consideration has also been given to providing a complicated and expensive arrangement comprising suction means combined with a carpet and/or perforated cylinder.

On aimerait avoir à disposition un étaleur-nappeur permettant une production de grande qualité à plus grande vitesse de la nappe et ce sans être obligé d'utiliser des moyens d'aspiration en combinaison avec un cylindre perforé qui augmentent de manière trop importante le coût de fabrication et la complexité du fonctionnement de l'étaleur-nappeur.We would like to have available a crosslapper allowing a high quality production at a higher speed of the web and this without having to use suction means in combination with a perforated cylinder which increase too much the cost of manufacture and the complexity of the operation of the crosslapper.

L'invention vise ainsi, suivant un premier aspect de l'invention, un étaleur-nappeur comme défini à la revendication 1, des perfectionnements et modes de réalisation préférés étant définis aux sous revendications.The invention thus relates, according to a first aspect of the invention, to a crosslapper as defined in claim 1, improvements and preferred embodiments being defined in the subclaims.

En prévoyant ainsi un élément rotatif, notamment un rouleau rotatif, au-dessus ou sensiblement au-dessus de la zone ou région de retournement pour créer une sorte de surpression locale par effet Magnus, on protège, grâce à cette surpression, le voile des effets néfastes de l'action combinée de la force centrifuge exercée sur le voile pendant son retournement et du flux d'air relatif induit par le mouvement de recul du chariot accumulateur lors du retournement du voile, ce qui favorise l'uniformité de la nappe finale en sortie de l'étaleur-nappeur.By thus providing a rotating element, in particular a rotating roller, above or substantially above the reversal zone or region to create a sort of local overpressure by Magnus effect, the veil is protected, thanks to this overpressure, from the effects adverse effects of the combined action of the centrifugal force exerted on the veil during its reversal and the relative air flow induced by the backward movement of the accumulator carriage during the reversal of the veil, which promotes the uniformity of the final ply in out of the crosslapper.

Suivant un autre aspect de l'invention, pouvant être mis en oeuvre indépendamment du premier aspect ou en combinaison avec celui-ci, un étaleur-nappeur destiné à fournir en sortie une nappe de fibres à partir d'un voile de fibres fourni en entrée, l'étaleur-nappeur réalisant la superposition de tronçons du voile pour former la nappe en sortie et comportant un tapis avant, un tapis arrière et des moyens de retournement destinés à retourner le voile de fibres pour le faire passer d'un état dans lequel il est supporté par le tapis avant à un état dans lequel il est supporté par le tapis arrière, est caractérisé en ce qu'il est disposé, sensiblement au-dessus de la région de retournement où le retournement du voile s'effectue, un élément entraîné en rotation, par exemple un rouleau ou cylindre entraîné en rotation, l'agencement étant tel que la surface extérieure de l'élément rotatif, notamment du rouleau rotatif, est en communication directe pour les fluides, notamment l'air, avec la zone de retournement, notamment sans interposition d'un tapis. En particulier l'élément rotatif n'est pas un élément d'entraînement du tapis avant et/ou du tapis arrière.According to another aspect of the invention, which can be implemented independently of the first aspect or in combination with the latter, a crosslapper intended to supply at the output a web of fibers from a veil of fibers supplied at the input , the crosslapper carrying out the superposition of sections of the veil to form the sheet at the output and comprising a front belt, a rear belt and turning means intended to turn the fiber veil to make it pass from a state in which it is supported by the front carpet in a state in which it is supported by the rear carpet, is characterized in that it is arranged, substantially above the turn-up region where the turn-up of the web takes place, an element driven in rotation, for example a roller or cylinder driven in rotation, the arrangement being such that the outer surface of the rotating element, in particular of the rotating roller, is in direct communication for fluids, in particular air, with the zone turning, in particular without the interposition of a carpet. In particular, the rotating element is not a drive element for the front belt and/or the rear belt.

Toujours suivant le premier aspect de l'invention, l'étaleur-nappeur réalisant la superposition de tronçons du voile pour former la nappe en sortie et comportant un tapis avant, un tapis arrière et des moyens de retournement destinés à retourner le voile de fibres pour le faire passer d'un état dans lequel il est supporté par le tapis avant à un état dans lequel il est supporté par le tapis arrière, est caractérisé en ce qu'il est disposé, sensiblement au-dessus de la région de retournement où le retournement du voile s'effectue, un élément entraîné en rotation, par exemple un rouleau ou cylindre entraîné en rotation, l'élément rotatif, notamment le rouleau rotatif, étant entraîné par un moteur.Still according to the first aspect of the invention, the crosslapper carrying out the superposition of sections of the veil to form the sheet at the outlet and comprising a front belt, a rear belt and turning means intended to turn the fiber veil to passing it from a state in which it is supported by the front carpet to a state in which it is supported by the rear carpet, is characterized in that it is arranged, substantially above the turnaround region where the The veil is turned over, an element driven in rotation, for example a roller or cylinder driven in rotation, the rotary element, in particular the rotary roller, being driven by a motor.

Suivant encore un autre aspect de l'invention, pouvant être mis en oeuvre indépendamment des autres aspects ou en combinaison avec un ou plusieurs de ceux-ci, un étaleur-nappeur destiné à fournir en sortie une nappe de fibres à partir d'un voile de fibres fourni en entrée, l'étaleur-nappeur réalisant la superposition de tronçons du voile pour former la nappe en sortie et comportant un tapis avant, un tapis arrière et des moyens de retournement destinés à retourner le voile de fibres pour le faire passer d'un état dans lequel il est supporté par le tapis avant à un état dans lequel il est supporté par le tapis arrière, est caractérisé en ce qu'il est disposé, sensiblement au-dessus de la région de retournement où le retournement du voile s'effectue, un élément entraîné en rotation, par exemple un rouleau ou cylindre entraîné en rotation, et l'étaleur-nappeur comporte un premier chariot, ou chariot accumulateur, et un deuxième chariot, ou chariot nappeur, la zone de retournement étant située dans le chariot accumulateur, et l'élément rotatif, notamment le rouleau rotatif, est solidaire du chariot accumulateur, notamment est disposé à l'intérieur de celui-ci.According to yet another aspect of the invention, operable independently of the other aspects or in combination with one or more thereof, a crosslapper for outputting a web of fibers from a web of fibers supplied at the input, the crosslapper carrying out the superposition of sections of the web to form the web at the output and comprising a front conveyor, a rear conveyor and turning means intended to turn the web of fibers over to make it pass from from a state in which it is supported by the front carpet to a state in which it is supported by the rear carpet, is characterized in that it is arranged, substantially above the turn-up region where the turn-up of the web is performs an element driven in rotation, for example a roller or cylinder driven in rotation, and the crosslapper comprises a first carriage, or accumulator carriage, and a second carriage, or lapper carriage, the turning zone being located in the accumulator carriage, and the rotary element, in particular the rotary roller, is integral with the accumulator carriage, in particular is arranged inside the latter.

Suivant encore un autre aspect de l'invention, pouvant être mis en oeuvre indépendamment des autres aspects ou en combinaison avec un ou plusieurs de ceux-ci, un étaleur-nappeur destiné à fournir en sortie une nappe de fibres à partir d'un voile de fibres fourni en entrée, l'étaleur-nappeur réalisant la superposition de tronçons du voile pour former la nappe en sortie et comportant un tapis avant, un tapis arrière et des moyens de retournement destinés à retourner le voile de fibres pour le faire passer d'un état dans lequel il est supporté par le tapis avant à un état dans lequel il est supporté par le tapis arrière, est caractérisé en ce qu'il est disposé, sensiblement au-dessus de la région de retournement où le retournement du voile s'effectue, un élément entraîné en rotation, par exemple un rouleau ou cylindre entraîné en rotation et l'élément rotatif, notamment le rouleau rotatif, a des formes et dimensions telles qu'il crée un flux d'air ayant un coefficient de Reynolds élevé, notamment supérieur à 8.000 et notamment compris entre 10.000 et 100.000.According to yet another aspect of the invention, operable independently of the other aspects or in combination with one or more thereof, a crosslapper for outputting a web of fibers from a web of fibers supplied at the input, the crosslapper carrying out the superposition of sections of the web to form the web at the output and comprising a front conveyor, a rear conveyor and turning means intended to turn the web of fibers over to make it pass from from a state in which it is supported by the front carpet to a state in which it is supported by the rear carpet, is characterized in that it is arranged, substantially above the turn-up region where the turn-up of the web is performs, an element driven in rotation, for example a roller or cylinder driven in rotation, and the rotating element, in particular the rotating roller, has shapes and dimensions such that it creates an air flow having a high Reynolds coefficient , in particular greater than 8,000 and in particular between 10,000 and 100,000.

Suivant encore un autre aspect de l'invention, pouvant être mis en oeuvre indépendamment des autres aspects ou en combinaison avec un ou plusieurs de ceux-ci, un étaleur-nappeur destiné à fournir en sortie une nappe de fibres à partir d'un voile de fibres fourni en entrée, l'étaleur-nappeur réalisant la superposition de tronçons du voile pour former la nappe en sortie et comportant un tapis avant, un tapis arrière et des moyens de retournement destinés à retourner le voile de fibres pour le faire passer d'un état dans lequel il est supporté par le tapis avant à un état dans lequel il est supporté par le tapis arrière, est caractérisé en ce qu'il est disposé, sensiblement au-dessus de la région de retournement où le retournement du voile s'effectue, un rouleau ou cylindre entraîné en rotation, et le rouleau est de type cannelé.According to yet another aspect of the invention, operable independently of the other aspects or in combination with one or more thereof, a crosslapper for outputting a web of fibers from a web of fibers supplied at the input, the crosslapper carrying out the superposition of sections of the veil to form the sheet at the output and comprising a front belt, a rear belt and turning means intended to return the veil of fibers to make it pass from a state in which it is supported by the front carpet to a state in which it is supported by the rear carpet, is characterized in that it is arranged, substantially above above the turning region where the turning of the veil takes place, a roller or cylinder driven in rotation, and the roller is of the fluted type.

De préférence, les cannelures s'étendent parallèlement à l'axe de rotation du rouleau.Preferably, the grooves extend parallel to the axis of rotation of the roller.

Suivant encore un autre aspect de l'invention, pouvant être mis en oeuvre indépendamment des autres aspects ou en combinaison avec un ou plusieurs de ceux-ci, un étaleur-nappeur destiné à fournir en sortie une nappe de fibres à partir d'un voile de fibres fourni en entrée, l'étaleur-nappeur réalisant la superposition de tronçons du voile pour former la nappe en sortie et comportant un tapis avant, un tapis arrière et des moyens de retournement destinés à retourner le voile de fibres pour le faire passer d'un état dans lequel il est supporté par le tapis avant à un état dans lequel il est supporté par le tapis arrière, est caractérisé en ce qu'il est disposé, sensiblement au-dessus de la région de retournement où le retournement du voile s'effectue, un élément entraîné en rotation, par exemple un rouleau ou cylindre entraîné en rotation, l'élément rotatif, notamment le rouleau rotatif, étant entraîné par un moteur et la commande du moteur d'entraînement de l'élément rotatif, notamment du rouleau, est réalisée de manière à donner à l'élément rotatif, notamment au rouleau, une vitesse de rotation proportionnelle à la vitesse d'entrée du voile dans le chariot accumulateur.According to yet another aspect of the invention, operable independently of the other aspects or in combination with one or more thereof, a crosslapper for outputting a web of fibers from a web of fibers supplied at the input, the crosslapper carrying out the superposition of sections of the web to form the web at the output and comprising a front conveyor, a rear conveyor and turning means intended to turn the web of fibers over to make it pass from from a state in which it is supported by the front carpet to a state in which it is supported by the rear carpet, is characterized in that it is arranged, substantially above the turn-up region where the turn-up of the web is performs, an element driven in rotation, for example a roller or cylinder driven in rotation, the rotary element, in particular the rotary roller, being driven by a motor and the control of the motor driving the rotary element, in particular the roller, is made in such a way as to give the rotating element, in particular the roller, a speed of rotation proportional to the speed at which the web enters the accumulator carriage.

Suivant un autre mode préférentiel, suivant encore un autre aspect de l'invention, pouvant être mis en oeuvre indépendamment des autres aspects ou en combinaison avec un ou plusieurs de ceux-ci, un étaleur-nappeur destiné à fournir en sortie une nappe de fibres à partir d'un voile de fibres fourni en entrée, l'étaleur-nappeur réalisant la superposition de tronçons du voile pour former la nappe en sortie et comportant un tapis avant, un tapis arrière et des moyens de retournement destinés à retourner le voile de fibres pour le faire passer d'un état dans lequel il est supporté par le tapis avant à un état dans lequel il est supporté par le tapis arrière, est caractérisé en ce qu'il est disposé, sensiblement au-dessus de la région de retournement où le retournement du voile s'effectue, un élément entraîné en rotation, par exemple un rouleau ou cylindre entraîné en rotation, l'élément rotatif, notamment le rouleau rotatif, étant entraîné par un moteur et la commande du moteur d'entraînement de l'élément rotatif, notamment du rouleau, est réalisée de manière à donner à l'élément rotatif, notamment au rouleau, une vitesse de rotation proportionnelle à la vitesse d'entrée du voile dans l'étaleur-nappeur.According to another preferred mode, according to yet another aspect of the invention, which can be implemented independently of the other aspects or in combination with one or more of the latter, a crosslapper intended to output a web of fibers from a web of fibers supplied at the input, the crosslapper carrying out the superimposition of sections of the web to form the web at the output and comprising a front belt, a rear belt and turning means intended to turn the fibers to change it from a state in which it is supported by the front mat to a state in which it is supported by the rear mat, is characterized in that it is arranged substantially above the turning region where the reversal of the veil takes place, an element driven in rotation, for example a roller or cylinder driven in rotation, the rotary element, in particular the rotary roller, being driven by a motor and the control of the drive motor of the The rotary element, in particular of the roller, is made in such a way as to give the rotary element, in particular of the roller, a speed of rotation proportional to the speed of entry of the web into the crosslapper.

En particulier, la zone ou région de retournement peut être définie, en coupe transversale par rapport à l'axe transversal des tapis, par l'espace délimité par la partie du tapis avant en contact avec le voile alors que celui-ci se trouve sous le tapis, par la partie du tapis arrière qui n'est pas en contact avec le voile et par un pincement constituant une ouverture d'entrée sur le dessus de la région, le pincement se trouvant au niveau où le tapis avant cesse de supporter le voile.In particular, the turn-up zone or region can be defined, in cross-section with respect to the transverse axis of the mats, by the space delimited by the part of the front mat in contact with the veil while the latter is under the carpet, by the part of the rear carpet which is not in contact with the veil and by a pinch constituting an entry opening on the top of the region, the pinch being at the level where the front carpet ceases to support the sail.

De préférence l'élément rotatif est à l'aplomb du pincement.Preferably the rotating element is directly above the pinch.

Suivant un mode de réalisation préféré, les moyens de retournement comportent un rouleau de détour.According to a preferred embodiment, the turning means comprise a diverting roller.

La présente invention se rapporte également à une installation comportant un dispositif de formation de voile, par exemple une carde, un étaleur nappeur suivant l'invention, alimenté par le dispositif de formation de voile, et un dispositif de consolidation de la nappe formée par l'étaleur nappeur, disposé à la suite de l'étaleur nappeur, par exemple une aiguilleteuse.The present invention also relates to an installation comprising a web-forming device, for example a card, a lapping spreader according to the invention, fed by the web-forming device, and a device for consolidating the web formed by the web. lapper spreader, arranged after the lapper spreader, for example a needle loom.

A titre d'exemple, on décrit maintenant un mode de réalisation préféré de l'invention en se reportant aux dessins, dans lesquels :

la figure 1
est une vue partielle en coupe en élévation illustrant un étaleur-nappeur suivant l'invention ; et
la figure 2
est une vue en perspective d'un mode de réalisation du rouleau rotatif de l'étaleur-nappeur de la figure 1.
By way of example, a preferred embodiment of the invention will now be described with reference to the drawings, in which:
figure 1
is a partial sectional view in elevation illustrating a crosslapper according to the invention; And
figure 2
is a perspective view of one embodiment of the rotary crosslapper roller of the figure 1 .

La figure 1 représente schématiquement un exemple de mode de réalisation d'un étaleur-nappeur suivant l'invention. Un transfert de voile intervient entre deux tapis. Le voile 1 arrive en continu sur un premier tapis 2 sans fin, dit tapis avant, puis pénètre dans un chariot d'entrée mobile en va et vient où il subit un retournement en effectuant un demi-tour pour être repris par un second tapis 4 sans fin, dis tapis arrière. A la sortie du chariot d'entrée, le voile 1 est convoyé entre les deux tapis 2 et 4. Le voile ainsi maintenu est ensuite repris par un deuxième chariot mobile de sortie, ou nappeur, qui a pour fonction d'étaler le voile en va et vient sur un tablier de sortie se déplaçant en continu transversalement, notamment perpendiculairement, au déplacement du chariot 5 nappeur, de manière à former une nappe constituée de plis décalés.There figure 1 schematically represents an exemplary embodiment of a crosslapper according to the invention. A fleece transfer occurs between two mats. The veil 1 arrives continuously on a first endless carpet 2, called the front carpet, then enters an entry carriage moving back and forth where it undergoes a reversal by performing a U-turn to be taken up by a second carpet 4 endless, say back mat. At the exit of the entry carriage, the veil 1 is conveyed between the two belts 2 and 4. The veil thus maintained is then taken up by a second mobile exit carriage, or lapper, whose function is to spread the veil in back and forth on a continuously moving exit apron transversely, in particular perpendicularly, to the movement of the lapper carriage 5, so as to form a lap consisting of staggered folds.

Le tapis 2 avant est guidé par des rouleaux de guidage 7 et 3 portés par le chariot mobile d'entrée définissant un tronçon incliné 9 de manière que le voile 1 transporté par ce tapis effectue autour du deuxième rouleau 3 un virage en demi-tour, cependant légèrement inférieur à 180°.The front belt 2 is guided by guide rollers 7 and 3 carried by the mobile entry carriage defining an inclined section 9 so that the veil 1 transported by this belt performs a U-turn around the second roller 3, however slightly less than 180°.

Dans le chariot d'entrée, le trajet du tapis 4 arrière est définis par quatre rouleaux 10, 11, 12 et 13 portés par le chariot d'entrée et disposés de manière qu'une ligne de pincement 14 soit ménagée entre le rouleau de guidage 3 du tapis 2 avant autour duquel le voile effectue son demi-tour et le rouleau 12 de guidage du tapis 4 arrière, et de manière que le tapis 4 arrière passe à proximité du rouleau 3 pour prendre en charge le support du voile à la sortie du rouleau 3.In the entry carriage, the path of the rear belt 4 is defined by four rollers 10, 11, 12 and 13 carried by the entry carriage and arranged so that a nip line 14 is provided between the guide roller 3 of the front carpet 2 around which the veil performs its U-turn and the roller 12 guiding the rear carpet 4, and so that the rear carpet 4 passes close to the roller 3 to support the support of the veil at the exit of roll 3.

Un rouleau 20 entraîné en rotation par rapport à un axe parallèle à l'axe du rouleau 3, est disposé au-dessus du rouleau 3 dans le chariot d'entrée, en étant solidaire du chariot d'entrée. Le rouleau 20 se trouve sensiblement au-dessus de la zone dans laquelle le voile 1 effectue son retournement, c'est à dire entre le rouleau 3 et le rouleau 12.A roller 20 driven in rotation with respect to an axis parallel to the axis of roller 3, is arranged above roller 3 in the inlet carriage, being integral with the inlet carriage. The roller 20 is located substantially above the zone in which the web 1 performs its reversal, that is to say between the roller 3 and the roller 12.

De préférence, comme représenté à la figure 2, le rouleau 20 comporte des cannelures longitudinales parallèles à l'axe de rotation du rouleau 20.Preferably, as shown in figure 2 , the roller 20 has longitudinal grooves parallel to the axis of rotation of the roller 20.

Le rouleau 20 est entraîné en rotation par un moteur (non représenté à la figure). Le moteur est commandé de manière à faire tourner le rouleau à une vitesse de rotation proportionnelle à la vitesse d'entrée du voile dans le chariot 3, ou préférablement, proportionnelle à la vitesse d'entrée du voile dans le nappeur afin d'éviter que des variations de vitesses trop brusques du rouleau ne permettent pas le maintien du phénomène aéraulique (Effet Magnus).Roller 20 is driven in rotation by a motor (not shown in the figure). The motor is controlled so as to rotate the roller at a speed of rotation proportional to the speed of entry of the veil into the carriage 3, or preferably, proportional to the entry speed of the web into the lapper in order to prevent too sudden speed variations of the roller from allowing the maintenance of the aeraulic phenomenon (Magnus Effect).

Le rouleau créé un flux d'air qui a un coefficient de Reynolds important, notamment supérieur à 8.000, par exemple compris entre 10.000 et 100.000.The roller creates an air flow which has a high Reynolds coefficient, in particular greater than 8,000, for example between 10,000 and 100,000.

A la figure 1, il est représenté un mode de réalisation dans lequel les moyens de retournement sont constitués principalement du rouleau 3 de retournement, qui est un simple rouleau plein. On pourrait cependant, sans sortir de l'étendue de protection de l'invention, prévoir un rouleau comme décrit au brevet EP2365113 , c'est à dire un rouleau comportant des cannelures ou des annelures. On pourrait également prévoir, bien que la présente invention permette, si on le souhaite, de s'en affranchir, un rouleau perforé, éventuellement en combinaison avec un tapis perforé, la combinaison de l'agencement de la présente invention avec un tel agencement de rouleau et/ou tapis perforé pour obtenir un maintien encore plus fort du voile (cependant dans ce cas avec une augmentation de la complexité et du coût du dispositif). De même, l'agencement relatif des deux tapis avant et arrière pourrait également être réalisé différemment de celui décrit à la figure 1 sans sortir du domaine de protection de l'invention. En particulier on pourrait prévoir un agencement relatif des deux tapis comme décrit dans EP2365113 ou dans EP1163383 .To the figure 1 , there is shown an embodiment in which the turning means consist mainly of the roller 3 for turning, which is a simple solid roller. One could however, without departing from the scope of protection of the invention, provide a roller as described in the patent EP2365113 , that is to say a roller comprising grooves or corrugations. Provision could also be made, although the present invention makes it possible, if desired, to dispense with it, a perforated roll, optionally in combination with a perforated mat, the combination of the arrangement of the present invention with such an arrangement of roller and/or perforated carpet to obtain an even stronger hold of the veil (however in this case with an increase in the complexity and cost of the device). Similarly, the relative arrangement of the two front and rear mats could also be made differently from that described in figure 1 without departing from the scope of protection of the invention. In particular, a relative arrangement of the two carpets could be provided as described in EP2365113 or in EP1163383 .

En particulier, on peut notamment définir la zone ou région de retournement comme étant la région délimitée par les tapis avant et arrière où le voile 1 n'est pas supporté, c'est à dire porté par le dessous, par au moins l'un des deux tapis. A la figure 1, cette région est la zone se trouvant entre les deux tapis 2 et 4 en dessous de la ligne de pincement 14, la région est définie, en coupe transversale, correspondant à celle de la figure 1, par un espace délimité par la partie du tapis 2 avant en contact avec le voile alors que celui-ci se trouve sous le tapis, par la partie du tapis 4 arrière qui n'est pas en contact avec le voile et par le pincement 14, ce dernier constituant une ouverture d'entrée sur le dessus de la région, le pincement 14 se trouvant au niveau où le tapis avant cesse de supporter le voile.In particular, it is possible in particular to define the zone or region of reversal as being the region delimited by the front and rear mats where the veil 1 is not supported, that is to say carried from below, by at least one of the two mats. To the figure 1 , this region is the area between the two mats 2 and 4 below of the pinch line 14, the region is defined, in cross-section, corresponding to that of the figure 1 , by a space delimited by the part of the front carpet 2 in contact with the veil while the latter is under the carpet, by the part of the rear carpet 4 which is not in contact with the veil and by the pinch 14 , the latter constituting an entrance opening on the top of the region, the pinch 14 being at the level where the front belt ceases to support the veil.

Claims (9)

  1. Cross-lapper intended to deliver at its output a web of fibres from a fleece (1) of fibres delivered at its input, the cross-lapper overlaying sections of the fleece to form the web at its output and comprising a front belt (2), a rear belt (4) and means of (3) reversal to reverse the fleece of fibres to change it from a state in which it is supported by the front belt to a state in which it is supported by the rear belt, characterised in that placed on top of the reversal region where the fleece is reversed, is a rotating part, for example a roller (20) or cylinder, being driven in rotation and placed such that a local overpressure is created by the Magnus effect in the region of reversal, the rotating part, in particular the roller driven in rotation, being driven by a motor.
  2. Cross-lapper according to claim 1, characterised in that the arrangement is such that the external surface of the rotating part, in particular the roller driven in rotation, is in direct communication with the region of reversal for fluids, in particular air, in particular without the interposition of a belt.
  3. Cross-lapper according to one of claims 1 or 2, characterised in that the cross-lapper comprises a first input carriage, or accumulator carriage, and a second output carriage, or lapping carriage, the region of reversal being located into the accumulator carriage, and the rotating part, in particular the roller (20) driven in rotation, is attached to the accumulator carriage, in particular is disposed inside it.
  4. Cross-lapper according to one of claims 1 to 3, characterised in that the roller driven in rotation has forms and dimensions such that it creates an air flow with a Reynolds number greater than 8,000 and in particular between 10,000 and 100,000.
  5. Cross-lapper according to one of claims 1 to 4, characterised in that the rotating part is a roller of the splined type.
  6. Cross-lapper according to claim 5, characterised in that the splines are parallel to the axis of rotation of the roller.
  7. Cross-lapper according to one of claims 1 to 6, characterised in that the drive motor of the rotating part is controlled to give the rotating part a speed of rotation proportional to the input speed of the fleece into the accumulator carriage.
  8. Cross-lapper according to one of claims 1 to 6, characterised in that the drive motor of the rotating part is controlled to give the rotating part a speed of rotation proportional to the input speed of the fleece into the cross-lapper.
  9. Installation comprising a fleece forming device, for example a card, a cross-lapper according to one of the preceding claims, supplied by the fleece forming device, and a device for consolidation of the web formed by the cross-lapper, located after the cross-lapper, for example a needle machine.
EP18707066.9A 2017-03-09 2018-03-05 Cross-lapper Active EP3592887B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1770230A FR3063741A1 (en) 2017-03-09 2017-03-09 FLATNESS
PCT/EP2018/055259 WO2018162369A1 (en) 2017-03-09 2018-03-05 Crosslapper

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EP3592887A1 EP3592887A1 (en) 2020-01-15
EP3592887B1 true EP3592887B1 (en) 2023-05-10

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EP (1) EP3592887B1 (en)
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FR (1) FR3063741A1 (en)
WO (1) WO2018162369A1 (en)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4475271A (en) * 1982-04-29 1984-10-09 Chicopee Process and apparatus for producing uniform fibrous web at high rate of speed
FR2791364B1 (en) 1999-03-23 2001-06-08 Asselin SPREADER
ITVI20050096A1 (en) * 2005-04-04 2006-10-05 Studio Tex Nology Srl HEAVY DUTY FOR CARDA SAILS AND METHOD OF BLADE OF SUITED VEHICLES MADE WITH THESE FALDATORE
ATE398691T1 (en) * 2006-02-01 2008-07-15 Dilo Kg Maschf Oskar DEVICE FOR LAYING A FLEECE
DE102006028448A1 (en) * 2006-06-21 2007-12-27 ERKO Trützschler GmbH stacker
FR2957092B1 (en) * 2010-03-08 2012-03-23 Asselin Thibeau MOVING CARRIER OF INPUT OF FLOORING BEAM COMPRISING A ROLL OF DETOUR WITH CANNELURES OR ANNELURES
EP2479321A1 (en) * 2011-01-19 2012-07-25 Oskar Dilo Maschinenfabrik KG Fibrous web laying device
DE102013113493A1 (en) * 2013-12-04 2015-06-11 TRüTZSCHLER GMBH & CO. KG stacker
CN103911770B (en) * 2014-04-22 2016-02-24 湖南大学 A kind of multiaxis is to cross lapping machine
CN204401259U (en) * 2014-12-31 2015-06-17 安国市中建无纺布有限公司 The lapping machine used in non-weaving cloth production process
FR3040398B1 (en) * 2015-09-02 2018-07-13 Andritz Asselin Thibeau DEVICE FORMING A PRUNER AND METHOD FOR CONTROLLING A CALIBRATOR OF THIS TYPE

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EP3592887A1 (en) 2020-01-15
WO2018162369A1 (en) 2018-09-13
FR3063741A1 (en) 2018-09-14
CN110382754A (en) 2019-10-25
CN110382754B (en) 2022-10-21

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