EP2998424B1 - Installation for consolidating a fibre batt, notably by needlepunching - Google Patents

Installation for consolidating a fibre batt, notably by needlepunching Download PDF

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Publication number
EP2998424B1
EP2998424B1 EP15183453.8A EP15183453A EP2998424B1 EP 2998424 B1 EP2998424 B1 EP 2998424B1 EP 15183453 A EP15183453 A EP 15183453A EP 2998424 B1 EP2998424 B1 EP 2998424B1
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EP
European Patent Office
Prior art keywords
stretching
batt
roller
notably
nonwoven
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP15183453.8A
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German (de)
French (fr)
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EP2998424A1 (en
Inventor
Jean-Christophe Laune
Hugues Leroy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andritz Asselin Thibeau SAS
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Andritz Asselin Thibeau SAS
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Publication of EP2998424A1 publication Critical patent/EP2998424A1/en
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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H18/00—Needling machines
    • D04H18/02—Needling machines with needles
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • 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
    • D04H13/00—Other non-woven fabrics
    • D04H13/001—Making non-woven fabrics from staple fibres, filaments or yarns, bonded to at least one web-like material, e.g. woven, knitted non-woven fabric, paper, leather, during consolidation
    • D04H13/003—Making non-woven fabrics from staple fibres, filaments or yarns, bonded to at least one web-like material, e.g. woven, knitted non-woven fabric, paper, leather, during consolidation strengthened or consolidated by mechanical methods
    • D04H13/005—Making non-woven fabrics from staple fibres, filaments or yarns, bonded to at least one web-like material, e.g. woven, knitted non-woven fabric, paper, leather, during consolidation strengthened or consolidated by mechanical methods by needling
    • 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
    • D04H18/00—Needling machines
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/10—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically
    • D04H3/105—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically by needling
    • 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
    • D04H5/00—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length
    • D04H5/02—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length strengthened or consolidated by mechanical methods, e.g. needling
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C3/00—Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics
    • D06C3/06—Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics by rotary disc, roller, or like apparatus

Definitions

  • the present invention relates to a consolidation system, in particular by needling, of a sheet of fibers, in particular a nonwoven web.
  • the present invention also relates to a fiber web, in particular a nonwoven web, obtained by an installation of this kind.
  • EP1876275 it is known to pass between disc rolls a web of fibers, comprising elastic fibers and non-elastic fibers, to give elasticity to the web of fibers. At the exit of the rollers, the web is contracted in width relative to its width before its entry between the rollers.
  • the present invention aims at overcoming the drawbacks of the prior art by aiming at a mechanical needling consolidation installation, in which the sheet of fibers, in particular the nonwoven web, is simpler to convey into the downstream installation of consolidation, in particular is easier to wind in coils.
  • an installation for consolidating a sheet of fibers, for example a nonwoven web, comprising a mechanical consolidation station, in particular by needling, is as defined in claim 1.
  • the stretching device in the CD direction is arranged so that the sheet of fibers, in particular the nonwoven web, is stretched more at the edges than at the center of the sheet, the profile of the drawing force as a function of the transverse abscissa being U-shaped.
  • the CD stretching device is constituted by a so-called activation annular roll which comprises annuli in the direction CD which engage in corresponding grooves formed in a grooved element arranged opposite the annular roll relative to to the ply of fibers, thereby to achieve a transverse stretching, that is to say in the direction CD, of the ply, in particular the nonwoven, which passes between the annealed roll and the grooved element.
  • the grooved element is another annular roll whose corrugations are offset from those of said corrugated roll, to allow the intersection of the corrugations of the two rollers.
  • the grooved element is an anvil, in particular profiled, in which are formed grooves intended to partially receive the corrugations to perform a transverse stretching, that is to say in the direction CD, of the web, particularly nonwoven, which passes between the corrugated roll and the grooved anvil.
  • the corrugations or disks of the activation roller (s) are not at a regular distance from each other, and in particular that the inter-disk or inter-roll distances of the rollers are smaller towards the edges than towards the center, thus increasing the stretching level of the edges with respect to the center.
  • the corrugations or discs of the roll or rolls (x ) of activation do not have a constant diameter from one disk to another in the direction CD, and in particular it is made that the diameters of the discs or annellings of the roller (s) are smaller towards the center that towards the edges, for example grow from the center to the edges, to thus increase the drawing at the edges relative to the center.
  • the present invention also relates to a consolidated nonwoven obtained by the installation according to the invention, in particular in the rolled-up state.
  • FIG. 1 it is represented, according to a schematic diagram, a needling consolidation installation of a nonwoven according to the invention.
  • the plant comprises as input a spreader-lapper (itself classically fed by a card), which conveys a fleece of nonwoven in one or more needling (s) 1.
  • a spreader-lapper itself classically fed by a card
  • the nonwoven is introduced into a 2 draw device in transverse direction or CD, in order to stretch in the direction CD the nonwoven coming out of the needling machine.
  • the nonwoven is sent into a winder 3, in which the nonwoven is wound, in particular in the form of a spool.
  • the position of the transverse stretcher in the line may vary from one installation to another. Similarly, the transverse stretcher may be located at several points in the line, in particular after each consolidation device.
  • the drawing device 2 is shown in more detail at figure 2 . It consists of two rolled rollers, respectively lower 4 and upper 5, the corrugations 6, 7 are shifted from one roller to another to allow them to mesh with each other.
  • the two rollers are made from a respective axis 8, 9 and a plurality of disks 10, 11, the outer edges of which form the corrugations.
  • the corrugations extend along the axis of each of the rollers, and this over the entire axial circular periphery.
  • FIG 3 it is represented, in a diagrammatic view, the two rollers 4 and 5.
  • the discs 6 of the upper and lower rollers which form the corrugations of the rollers which mesh with the discs forming the corrugations of the other roll are arranged so as to be at a distance substantially equal to each other by extending in the direction CD. This results in substantially uniform stretching along the CD axis.
  • the discs 6 are less distant from each other in the direction CD, when moving towards the edge portions, that is to say left or right of the nonwoven relative to In the center.
  • the distance between adjacent or successive disks at the right and left edges is less large than the distance between adjacent or successive disks that are substantially at the center of the nonwoven that passes between the two rollers.
  • the value of the drawing force in the CD direction at the edges is greater than in the center.
  • the distance between two successive annealing disks decreases as one moves from the center of the nonwoven and thus substantially from the middle of the cylinder to each of the edges, respectively left and right , so that the curve giving the value of the transverse stretching force as a function of the position in the direction CD is in the shape of a U. Knowing that the curve giving the weight or local specific gravity as a function of the position on the CD axis of the nonwoven coming out of the needling has a U-shape, thus achieving a uniform weighting. This improves the stability of the nonwoven during its subsequent delivery and in particular helps the winding by combating a rope effect that is found in the devices of the prior art.
  • the consolidated nonwoven obtained at the outlet of the installation, after having been stretched, has a transverse profile of substantially uniform grammage, in particular the difference between the local grammage at one edge or the edges is substantially identical to that of the center, in particular they differ by less than 10%, in particular by less than 5%.
  • one of the two disc rollers can be replaced by an anvil 12, in particular a fixed anvil, in which grooves have been cut to partially receive the corrugations of the other roll.
  • the disks of the or each roller have a diameter that varies from the edge. towards the center to vary the transverse stretching force from the edge to the center.

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

Description

La présente invention se rapporte à une installation de consolidation, notamment par aiguilletage, d'une nappe de fibres, notamment d'un voile de non-tissé.The present invention relates to a consolidation system, in particular by needling, of a sheet of fibers, in particular a nonwoven web.

La présente invention se rapporte également à une nappe de fibres, notamment un voile de non-tissé, obtenue par une installation de ce genre.The present invention also relates to a fiber web, in particular a nonwoven web, obtained by an installation of this kind.

De EP1876275 , il est connu de faire passer entre des rouleaux à disques une nappe de fibres, comportant des fibres élastiques et des fibres non élastiques, pour donner de l'élasticité à la nappe de fibres. A la sortie des rouleaux, la nappe est contractée en largeur par rapport à sa largeur avant son entrée entre les rouleaux.Of EP1876275 it is known to pass between disc rolls a web of fibers, comprising elastic fibers and non-elastic fibers, to give elasticity to the web of fibers. At the exit of the rollers, the web is contracted in width relative to its width before its entry between the rollers.

Dans de nombreuses installations textiles, par exemple celle décrite dans FR23811123 , et notamment dans des installations de consolidation de non-tissés mécanique et/ou hydraulique, par exemple par aiguilletage ou par jets d'eau, la nappe de fibres consolidée est difficile à acheminer pour un traitement ultérieur, notamment pour son enroulement en bobine.In many textile installations, for example that described in FR23811123 , and in particular in mechanical and / or hydraulic non-woven consolidation plants, for example by needling or by water jets, the consolidated fiber web is difficult to convey for further processing, in particular for its coil winding.

La présente invention vise à surmonter les inconvénients de l'art antérieur en visant une installation de consolidation mécanique par aiguilletage, dans laquelle la nappe de fibres, notamment le voile de non-tissé, est plus simple à acheminer dans l'installation en aval de la consolidation, notamment est plus simple à enrouler en bobines.The present invention aims at overcoming the drawbacks of the prior art by aiming at a mechanical needling consolidation installation, in which the sheet of fibers, in particular the nonwoven web, is simpler to convey into the downstream installation of consolidation, in particular is easier to wind in coils.

Suivant l'invention, une installation de consolidation d'une nappe de fibres, par exemple d'un voile de non-tissé, comportant un poste de consolidation mécanique, notamment par aiguilletage, est telle que définie à la revendication 1.According to the invention, an installation for consolidating a sheet of fibers, for example a nonwoven web, comprising a mechanical consolidation station, in particular by needling, is as defined in claim 1.

En prévoyant ainsi d'étirer la nappe dans le sens transversal CD après l'avoir consolidée, on s'est rendu compte que le traitement ultérieur de la nappe, notamment son acheminement et/ou son enroulement, était facilité. Les inventeurs ont compris que l'acheminement et/ou l'enroulement étaient rendus difficiles par le fait que, par exemple lors de la consolidation par aiguilletage, la nappe ou le non-tissé subit une rétraction qui induit une répartition non uniforme de la densité massique dans la direction transversale, notamment en forme de U en étant plus lourd sur les bords qu'au centre, répartition qui a des effets néfastes sur la stabilité de l'acheminement de la nappe et notamment de son enroulement. En combattant la rétraction, on rend le non-tissé consolidé plus uniforme en terme de répartition massique et d'orientation des fibres dans la direction transversale et par conséquent on améliore la stabilité de l'acheminement et/ou de l'enroulement. En outre, cette stabilité a des effets positifs sur l'aspect et les caractéristiques finales du non-tissé, moins sujet à des défauts.By thus providing for stretching the web in the transverse direction CD after having consolidated it, it was realized that the subsequent treatment of the web, in particular its routing and / or winding, was facilitated. The inventors have understood that routing and / or winding were made difficult by the fact that, for example during needling consolidation, the sheet or the nonwoven undergoes a shrinkage which induces a non-uniform distribution of the density. mass in the transverse direction, in particular U-shaped being heavier at the edges than in the center, which distribution has adverse effects on the stability of the transport of the web and in particular its winding. By combatting shrinkage, the consolidated nonwoven is made more uniform in terms of mass distribution and orientation of the fibers in the transverse direction and therefore the stability of the conveyance and / or the wrapping is improved. In addition, this stability has positive effects on the appearance and final characteristics of the nonwoven, less prone to defects.

Suivant un mode de réalisation préféré de l'invention, le dispositif d'étirage en direction CD est agencé de sorte que la nappe de fibres, notamment le voile de non-tissé, est étirée plus aux bords qu'au centre de la nappe, le profil de la force d'étirage en fonction de l'abscisse transversal étant en forme de U.According to a preferred embodiment of the invention, the stretching device in the CD direction is arranged so that the sheet of fibers, in particular the nonwoven web, is stretched more at the edges than at the center of the sheet, the profile of the drawing force as a function of the transverse abscissa being U-shaped.

Suivant un mode de réalisation préféré de l'invention, le dispositif d'étirement CD est constitué d'un rouleau annelé dit d'activation qui comporte des annelures s'étendant dans la direction CD qui engrènent dans des rainures correspondantes formées dans un élément rainuré disposé en vis-à-vis du rouleau annelé par rapport à la nappe de fibres, pour ainsi réaliser un étirage transversal, c'est-à-dire dans la direction CD, de la nappe, notamment du non-tissé, qui passe entre le rouleau annelé et l'élément rainuré.According to a preferred embodiment of the invention, the CD stretching device is constituted by a so-called activation annular roll which comprises annuli in the direction CD which engage in corresponding grooves formed in a grooved element arranged opposite the annular roll relative to to the ply of fibers, thereby to achieve a transverse stretching, that is to say in the direction CD, of the ply, in particular the nonwoven, which passes between the annealed roll and the grooved element.

Suivant un mode de réalisation préféré, l'élément rainuré est un autre rouleau annelé dont les annelures sont décalées par rapport à celles dudit rouleau annelé, pour permettre l'intersection des annelures des deux rouleaux.According to a preferred embodiment, the grooved element is another annular roll whose corrugations are offset from those of said corrugated roll, to allow the intersection of the corrugations of the two rollers.

Suivant un autre mode de réalisation, l'élément rainuré est une enclume, notamment profilée, dans laquelle sont formées des rainures destinées à recevoir partiellement les annelures pour réaliser un étirage transversal, c'est-à-dire dans la direction CD, de la nappe, notamment du non-tissé, qui passe entre le rouleau annelé et l'enclume à rainures.According to another embodiment, the grooved element is an anvil, in particular profiled, in which are formed grooves intended to partially receive the corrugations to perform a transverse stretching, that is to say in the direction CD, of the web, particularly nonwoven, which passes between the corrugated roll and the grooved anvil.

Suivant un mode de réalisation préféré de l'invention, pour réaliser une non uniformité de la force d'étirement dans la direction transversale ou CD du non-tissé sortant de l'aiguilletage, on fait en sorte que les annelures ou disques du ou des rouleau (x) d'activation ne soient pas à une distance régulière les unes des autres, et notamment on fait en sorte que les distances inter disques ou inter annelures des rouleaux soient plus petites vers les bords que vers le centre, pour ainsi augmenter l'étirage au niveau des bords par rapport au centre.According to a preferred embodiment of the invention, to achieve a nonuniformity of the stretching force in the transverse direction or CD of the nonwoven coming out of the needling, it is arranged that the corrugations or disks of the activation roller (s) are not at a regular distance from each other, and in particular that the inter-disk or inter-roll distances of the rollers are smaller towards the edges than towards the center, thus increasing the stretching level of the edges with respect to the center.

Suivant un autre mode de réalisation favorable, pour réaliser une non uniformité de la force d'étirement dans la direction transversale ou CD du non-tissé sortant de l'aiguilletage, on fait en sorte que les annelures ou disques du ou des rouleau(x) d'activation n'aient pas un diamètre constant d'un disque à l'autre dans la direction CD, et notamment on fait en sorte que les diamètres des disques ou annelures du ou des rouleau (x) soient plus petits vers le centre que vers les bords, par exemple croissent du centre vers les bords, pour ainsi augmenter l'étirage au niveau des bords par rapport centre.According to another favorable embodiment, to achieve a nonuniformity of the stretching force in the transverse direction or CD of the nonwoven coming out of the needling, it is arranged that the corrugations or discs of the roll or rolls (x ) of activation do not have a constant diameter from one disk to another in the direction CD, and in particular it is made that the diameters of the discs or annellings of the roller (s) are smaller towards the center that towards the edges, for example grow from the center to the edges, to thus increase the drawing at the edges relative to the center.

La présente invention se rapporte également à un non-tissé consolidé obtenu par l'installation suivant l'invention, notamment à l'état enroulé en bobine.The present invention also relates to a consolidated nonwoven obtained by the installation according to the invention, in particular in the rolled-up state.

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

la figure 1
est une vue d'ensemble schématique d'une installation de consolidation par aiguilletage d'un non-tissé suivant un mode de réalisation de l'invention ;
la figure 2
est une vue en perspective d'un dispositif d'étirage transversal pouvant être utilisé dans l'installation de la figure 1 ;
la figure 3
est une vue schématique en coupe longitudinale des deux rouleaux d'activation supérieur et inférieur du dispositif d'étirage de la figure 2 ;
la figure 4
est une vue identique à la figure 3 suivant un autre mode de réalisation de l'invention ;
la figure 5
est une vue en coupe d'un mode de réalisation en variante comportant un rouleau unique d'activation en vis-à-vis d'une enclume comportant une série correspondante de nervures ; et
la figure 6
représente une variante du mode de réalisation de la figure 5 permettant un étirage transversal progressif en fonction de la forme des nervures.
By way of example only, an embodiment of the invention will now be described with reference to the drawings, in which:
Figure 1
is a schematic overview of a needling consolidation installation of a nonwoven according to one embodiment of the invention;
Figure 2
is a perspective view of a transverse drawing device that can be used in the installation of the figure 1 ;
Figure 3
is a schematic view in longitudinal section of the two upper and lower activation rollers of the drawing device of the figure 2 ;
Figure 4
is a view identical to the figure 3 following a another embodiment of the invention;
Figure 5
is a sectional view of an alternative embodiment having a single activation roller facing an anvil having a corresponding series of ribs; and
Figure 6
represents a variant of the embodiment of the figure 5 allowing progressive transverse stretching depending on the shape of the ribs.

A la figure 1, il est représenté, suivant un schéma de principe, une installation de consolidation par aiguilletage d'un non-tissé suivant l'invention. L'installation comporte en entrée un étaleur-nappeur (lui-même classiquement alimenté par une carde), qui achemine un voile de non-tissé dans une ou plusieurs aiguilleteuse(s) 1. A la sortie de l'aiguilleteuse, dans laquelle le non-tissé a été consolidé en étant perforé par des aiguilles issues d'une planche à aiguilles à laquelle on a donné un mouvement de va-et-vient perpendiculairement à la direction d'acheminement du voile, le non-tissé est introduit dans un dispositif 2 d'étirage en direction transversale ou CD, afin d'étirer dans la direction CD le non-tissé sortant de l'aiguilleteuse. A la sortie du dispositif d'étirage, le non-tissé est envoyé dans un enrouleur 3, dans lequel le non-tissé est enroulé, notamment sous forme de bobine.To the figure 1 , it is represented, according to a schematic diagram, a needling consolidation installation of a nonwoven according to the invention. The plant comprises as input a spreader-lapper (itself classically fed by a card), which conveys a fleece of nonwoven in one or more needling (s) 1. At the exit of the needling machine, in which the non-woven was consolidated by being perforated by needles from a needle board which was reciprocated perpendicularly to the direction of conveyance of the veil, the nonwoven is introduced into a 2 draw device in transverse direction or CD, in order to stretch in the direction CD the nonwoven coming out of the needling machine. At the exit of the drawing device, the nonwoven is sent into a winder 3, in which the nonwoven is wound, in particular in the form of a spool.

La position de l'étireur transversal dans la ligne peut varier d'une installation à l'autre. De même, l'étireur transversal peut être situé à plusieurs endroits dans la ligne, notamment après chaque dispositif de consolidation.The position of the transverse stretcher in the line may vary from one installation to another. Similarly, the transverse stretcher may be located at several points in the line, in particular after each consolidation device.

Le dispositif 2 d'étirage est représenté plus en détail à la figure 2. Il est constitué de deux rouleaux annelés, respectivement inférieur 4 et supérieur 5, dont les annelures 6, 7 sont décalées d'un rouleau à l'autre pour leur permettre de s'engrener mutuellement. Les deux rouleaux sont réalisés à partir d'un axe 8, 9 respectif et d'une pluralité de disques 10, 11, dont les bords extérieurs forment les annelures. Ainsi, les annelures s'étendent le long de l'axe de chacun des rouleaux, et ce sur toute la périphérie circulaire axiale.The drawing device 2 is shown in more detail at figure 2 . It consists of two rolled rollers, respectively lower 4 and upper 5, the corrugations 6, 7 are shifted from one roller to another to allow them to mesh with each other. The two rollers are made from a respective axis 8, 9 and a plurality of disks 10, 11, the outer edges of which form the corrugations. Thus, the corrugations extend along the axis of each of the rollers, and this over the entire axial circular periphery.

Lorsque le non-tissé passe dans l'interstice entre les deux rouleaux, il subit ainsi un étirage dans la direction CD, c'est-à-dire dans une direction parallèle à l'axe des rouleaux.When the nonwoven passes into the gap between the two rollers, it undergoes stretching in the direction CD, that is to say in a direction parallel to the axis of the rollers.

A la figure 3, il est représenté, suivant une vue schématique, les deux rouleaux 4 et 5. Les disques 6 des rouleaux supérieur et inférieur qui forment les annelures des rouleaux qui engrènent dans les disques formant les annelures de l'autre rouleau sont disposés de manière à être à distance sensiblement égale les uns des autres en s'étendant dans la direction CD. Il en résulte un étirage sensiblement uniforme le long de l'axe CD.To the figure 3 , it is represented, in a diagrammatic view, the two rollers 4 and 5. The discs 6 of the upper and lower rollers which form the corrugations of the rollers which mesh with the discs forming the corrugations of the other roll are arranged so as to be at a distance substantially equal to each other by extending in the direction CD. This results in substantially uniform stretching along the CD axis.

Suivant un perfectionnement de l'invention représenté à la figure 4, on peut également faire en sorte que les disques 6 soient moins éloignés les uns des autres dans la direction CD, lorsqu'on se déplace vers les parties de bord, c'est-à-dire gauche ou droite du non-tissé par rapport au centre. Ainsi, la distance entre des disques adjacents ou successifs au niveau des bords droit et gauche est moins grande que la distance entre des disques adjacents ou successifs qui se trouvent sensiblement au niveau du centre du non-tissé qui passe entre les deux rouleaux. Ainsi, la valeur de la force d'étirage dans la direction CD au niveau des bords est plus grande qu'au centre.According to an improvement of the invention shown in figure 4 it can also be ensured that the discs 6 are less distant from each other in the direction CD, when moving towards the edge portions, that is to say left or right of the nonwoven relative to In the center. Thus, the distance between adjacent or successive disks at the right and left edges is less large than the distance between adjacent or successive disks that are substantially at the center of the nonwoven that passes between the two rollers. Thus, the value of the drawing force in the CD direction at the edges is greater than in the center.

Suivant un mode de réalisation particulièrement préféré, la distance entre deux disques formant annelures successifs diminue au fur et à mesure que l'on se déplace du centre du non-tissé et donc sensiblement du milieu du cylindre vers chacun des bords, respectivement gauche et droit, de sorte que la courbe donnant la valeur de la force d'étirage transversal en fonction de la position dans la direction CD est en forme de U. Sachant que la courbe donnant le grammage ou densité massique locale en fonction de la position sur l'axe CD du non-tissé sortant de l'aiguilletage a une forme en U, on réalise ainsi une uniformisation du grammage. On améliore ainsi la stabilité du non-tissé lors de son acheminement ultérieur et notamment on aide à l'enroulement en combattant un effet de corde que l'on constate dans les dispositifs de l'art antérieur.According to a particularly preferred embodiment, the distance between two successive annealing disks decreases as one moves from the center of the nonwoven and thus substantially from the middle of the cylinder to each of the edges, respectively left and right , so that the curve giving the value of the transverse stretching force as a function of the position in the direction CD is in the shape of a U. Knowing that the curve giving the weight or local specific gravity as a function of the position on the CD axis of the nonwoven coming out of the needling has a U-shape, thus achieving a uniform weighting. This improves the stability of the nonwoven during its subsequent delivery and in particular helps the winding by combating a rope effect that is found in the devices of the prior art.

Il est à noter également qu'en prévoyant un tel dispositif d'étirage, qui a en général pour objectif d'étirer le non-tissé en sortie d'une valeur d'étirage de 5 à 20%, notamment d'une dizaine de pour-cent, on peut s'affranchir d'avoir un dimensionnement du dispositif d'aiguilletage trop important, ce qui limite les coûts de l'installation, qui sont fortement dépendants de la superficie d'aiguilles du dispositif d'aiguilletage.It should also be noted that by providing such a drawing device, which is generally intended to stretch the nonwoven output of a draw value of 5 to 20%, including a dozen of percent, it can be overcome to have a sizing of the needling device too large, which limits the costs of installation, which are highly dependent on the needle area of the needling device.

Le non-tissé consolidé obtenu en sortie de l'installation, après avoir été étiré, a un profil transversal de grammage sensiblement uniforme, notamment la différence entre le grammage local à un bord ou aux bords est sensiblement identique à celui du centre, notamment ils diffèrent de moins de 10%, notamment de moins de 5%.The consolidated nonwoven obtained at the outlet of the installation, after having been stretched, has a transverse profile of substantially uniform grammage, in particular the difference between the local grammage at one edge or the edges is substantially identical to that of the center, in particular they differ by less than 10%, in particular by less than 5%.

Suivant d'autres modes de réalisation représentés aux figures 5 et 6, on peut remplacer l'un des deux rouleaux à disques par une enclume 12, notamment fixe, dans laquelle ont été creusées des rainures pour recevoir partiellement les annelures de l'autre rouleau.According to other embodiments shown in Figures 5 and 6 one of the two disc rollers can be replaced by an anvil 12, in particular a fixed anvil, in which grooves have been cut to partially receive the corrugations of the other roll.

Suivant encore un autre mode de réalisation non représenté, qui peut être mis en oeuvre en combinaison avec les autres modes de réalisation ou en tant que tel, on peut faire en sorte que les disques du ou de chaque rouleau aient un diamètre qui varie du bord vers le centre pour ainsi faire varier la force d'étirement transversale du bord vers le centre.According to yet another embodiment not shown, which can be implemented in combination with the other embodiments or as such, it can be arranged that the disks of the or each roller have a diameter that varies from the edge. towards the center to vary the transverse stretching force from the edge to the center.

Suivant encore un autre mode de réalisation non représenté, on peut former les annelures et les rainures correspondantes par un système de peignes ou de lamelles à distance les unes des autres.According to yet another embodiment not shown, one can form the corrugations and the corresponding grooves by a system of combs or lamellae at a distance from each other.

Claims (6)

  1. Installation for consolidating a batt of fibres, for example a nonwoven web, comprising a mechanical-consolidation workstation using needlepunching from which the fibre batt emerges in a machine direction, referred to as MD direction, characterized in that there is provided downstream of the consolidation workstation a device (2) for stretching the batt of fibres in the CD direction perpendicular to the MD direction and parallel to the plane of the batt, notably before it is wound onto a reel, the device (2) for stretching in the CD direction being arranged in such a way that the fibre batt, notably the nonwoven web, is stretched more at the edges than at the centre of the batt, the profile of the stretching force as a function of the transverse abscissa axis being U-shaped.
  2. Installation according to Claim 1, characterized in that the CD-stretch device (2) consists of a ringed roller (4; 5) called an activation roller which comprises rings extending in the CD direction and meshing in corresponding grooves formed in a grooved element (5; 4; 7) arranged opposite the ringed roller with respect to the fibre batt, in order thus to effect cross stretching, namely stretching in the direction CD, of the batt, notably of the nonwoven, passing between the ringed roller and the grooved element.
  3. Installation according to Claim 2, characterized in that the grooved element is another ringed roller (5; 4), the rings of which are offset from those of said ringed roller so as to allow the rings of the two rollers to intermesh.
  4. Installation according to Claim 2 or 3, characterized in that the grooved element is an anvil (12), notably a shaped anvil, in which are formed grooves intended partially to accept the rings in order to effect cross stretching, namely stretching in the CD direction, of the batt, notably of the nonwoven, passing between the ringed roller and the grooved anvil.
  5. Installation according to one of Claims 2 to 4, characterized in that, in order to create nonuniformity in the force of stretching in the cross direction or CD direction of the nonwoven leaving the needlepunching stage, measures are taken to ensure that the rings or discs of the activation roller or rollers are not evenly spaced apart, and notably measures are taken to ensure that the inter-disc or inter-ring distances of the rollers are smaller towards the edges than towards the centre, in order thus to increase the degree of stretch at the edges in relation to the centre.
  6. Installation according to one of Claims 2 to 5, characterized in that, in order to create nonuniformity in the force of stretching in the cross direction or CD direction of the nonwoven leaving the needlepunching stage, measures are taken to ensure that the rings or discs of the activation roller or rollers do not have a diameter that is constant from one disc to the next in the CD direction, and notably measures are taken to ensure that the diameters of the discs or rings of the roller or rollers are larger towards the edges than towards the centre, for example increase from the centre towards the edges, in order thus to increase the degree of stretch at the edges in relation to the centre.
EP15183453.8A 2014-09-22 2015-09-02 Installation for consolidating a fibre batt, notably by needlepunching Active EP2998424B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1402118A FR3026112B1 (en) 2014-09-22 2014-09-22 CONSOLIDATION INSTALLATION, IN PARTICULAR BY REFRIGERATION, OF A FIBER TABLE

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EP2998424A1 EP2998424A1 (en) 2016-03-23
EP2998424B1 true EP2998424B1 (en) 2018-07-18

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EP (1) EP2998424B1 (en)
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Publication number Priority date Publication date Assignee Title
FR3059344B1 (en) * 2016-11-25 2019-11-22 Andritz Asselin Thibeau DEVICE FOR STRETCHING A SAIL PROVIDED BETWEEN A CARD DEVICE AND A CALIPER
CN108716064B (en) * 2018-06-26 2020-05-08 桐乡市易知简能信息技术有限公司 High efficiency needle loom

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EP1936016A2 (en) * 2006-12-22 2008-06-25 Asselin-Thibeau Method for adjusting the local characteristics of a non-woven fabric and corresponding installation

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CN105442190A (en) 2016-03-30
US20160083882A1 (en) 2016-03-24
US10100447B2 (en) 2018-10-16
FR3026112B1 (en) 2017-06-23
CN105442190B (en) 2019-12-20
EP2998424A1 (en) 2016-03-23
FR3026112A1 (en) 2016-03-25

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