EP1499767A1 - Drum for a production unit for a non-woven material, method for production of a non-woven material and non-woven material obtained thus - Google Patents

Drum for a production unit for a non-woven material, method for production of a non-woven material and non-woven material obtained thus

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Publication number
EP1499767A1
EP1499767A1 EP03746325A EP03746325A EP1499767A1 EP 1499767 A1 EP1499767 A1 EP 1499767A1 EP 03746325 A EP03746325 A EP 03746325A EP 03746325 A EP03746325 A EP 03746325A EP 1499767 A1 EP1499767 A1 EP 1499767A1
Authority
EP
European Patent Office
Prior art keywords
drum
compartment
conveyor
lateral surface
tower
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.)
Granted
Application number
EP03746325A
Other languages
German (de)
French (fr)
Other versions
EP1499767B1 (en
Inventor
Frédéric NOELLE
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 Perfojet SAS
Original Assignee
Rieter Perfojet SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rieter Perfojet SAS filed Critical Rieter Perfojet SAS
Priority to EP07008823.2A priority Critical patent/EP1829997B1/en
Publication of EP1499767A1 publication Critical patent/EP1499767A1/en
Application granted granted Critical
Publication of EP1499767B1 publication Critical patent/EP1499767B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D04H18/04—Needling machines with water jets
    • 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
    • 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
    • D04H3/11—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 fluid jet

Definitions

  • the present invention relates to nonwoven webs and their production methods and installations.
  • US Patent 6,321,425 describes a method of manufacturing a nonwoven web which consists of sending a web, from a spunbond tower which normally comprises successively from top to bottom a generator of a curtain of filaments, in particular of plastic filaments, an attenuating device with a slit for stretching the curtain filaments, a diffuser and a conveyor for receiving the filaments, to a calender which consolidates the blank of formed web, then to a tangle drum by jets of water.
  • This process has the drawback of altering the uniformity of the formation of the sheet and of orienting the filaments preferentially in the machine direction by the stretching which is applied thereto.
  • the invention overcomes this drawback by making it possible to obtain a nonwoven web whose properties are substantially isotropic, that is to say substantially identical, whether in the machine direction or in the cross direction.
  • a drum comprising a fixed cylindrical body with a perforated lateral surface surrounded by a perforated sleeve driven in rotation relative to the axis of the cylindrical body, and means intended to create a depression inside the body.
  • a waterproof partition subdivides the interior of the body into two compartments delimited by the partition and by respectively a first and a second part of the lateral surface and both put under vacuum by the means intended to create.
  • the first drum compartment according to the invention makes it possible to bring on the drum a blank of sheet being on a conveyor associated, substantially tangent to the drum at a so-called point of contact (this is the point where the conveyor and the drum are closest to each other without touching each other), even if this blank of sheet is still poorly consolidated, as is the case when it comes to the tablecloth coming from a spunbond tower, without having to first calender the blank of the tablecloth or subject it to other operations involving drawing which permanently affect the isotropy of the properties of the nonwoven web finally obtained.
  • the first compartment begins opposite the point of contact of the conveyor tangent to the drum and ends opposite a point on the downstream side surface, in the direction of rotation of the sleeve, of the contact point.
  • the first compartment extends over a cylindrical sector of the defined body, in the cross-sectional view of the cylindrical body, substantially by two radii perpendicular to each other, the first compartment occupying substantially a quarter of the interior. from the body.
  • the cylindrical sector occupied by the first compartment is arranged in the second dial between three and six hours.
  • each compartment has its own means of creating a depression and, preferably, the depression is greater in the first compartment than in the second.
  • the ratio of the total area of the perforations, per unit of area, to the area of the lateral surface where they are located is greater for the first compartment than for the second. This ratio can be for the first compartment between 5% and 30%, while for the second compartment it is between 2% and 15%.
  • the perforations in the lateral surface opposite the second compartment are in particular slots which are located opposite pressurized water injectors on the part of the sleeve which passes precisely opposite the part of the lateral surface of the second compartment.
  • the pressure of the jets is generally between 30 and 400 bars and the diameter of each jet between 75 and 200 microns.
  • a rigid rotary perforated cylinder is mounted outside the fixed cylindrical body and its inside diameter is adjusted to the outside diameter of the cylindrical body so that the minimum clearance thus preserved allows rotation while minimizing air leaks. According to the technical solution adopted for the manufacture of this rotary cylinder, it is envisaged to use plastic battens mounted on springs to improve the sealing of the separation of the two compartments.
  • This rotary cylinder can be a simple perforated sheet, a bronze or stainless steel cylinder pierced with holes arranged in a helix, a honeycomb cylinder. It can be a tube of rolled perforated sheet coated with a coarse metallic fabric drainage sleeve which ensures good uniformity of water extraction. This rotary cylinder supports a thinner perforated sleeve which effectively supports the filaments and fibers of the nonwoven during hydraulic entanglement.
  • the distribution of the holes in the sleeve can be random.
  • the holes can also be ordered by being aligned or staggered.
  • the holes of the sleeve can also be distributed in small areas of ordered perforations distributed randomly on the surface of the sleeve.
  • the sleeve can be made of a metallic fabric or synthetic material or a mixture of metallic fabric and synthetic material. It is preferred that the diameter of the holes in the sleeve is between 50 and 500 microns. Provision may be made, in order to obtain patterns on the sheet, also to thread an openwork sheath on the sleeve, the openings of which have at least a dimension greater than 2 mm.
  • the invention also relates to an installation for producing a nonwoven web comprising a spunbond conveyor tower leading to a drum according to the invention.
  • the tower conveyor and the tangent drum conveyor are one and the same conveyor, but it is also possible to provide two separate conveyors.
  • the drum is mounted directly downstream of the tower.
  • directly downstream is meant, in the present specification, without interposition of a device causing the stretching of the sheet. There is therefore no calender, but there may be a compactor roller.
  • the invention also relates to a method of producing a nonwoven web, which consists in using an installation according to the invention, and in adjusting the speed of the tower conveyor or of the tangent conveyor to a value greater than the linear speed. of the drum (counted around the periphery of the 5 drum). A nonwoven web is thus obtained in which the ratio of the breaking strength in the machine direction to that in the cross direction can be less than 1 due to this difference in speed. When the speeds are substantially the same one can obtain a ratio of the breaking strength in the machine direction to that in the cross direction of the non-ply
  • FIG. 1 is a cutaway perspective view of an installation according to the invention
  • Figure 2 and Figure 3 are two perspective views with cutaway of a drum according to the invention and Figures 4 and 5 are two schematic views of two variants of the installation according to the invention.
  • the drum shown schematically in Figure 1 includes a
  • the 20 interior body 1 composed of a fixed cylinder with a diameter of 400 mm and a sheet forming the lateral surface.
  • the lateral surface is perforated with perforations with a diameter of 8 mm in a part which will delimit what will later be called the first compartment and the lateral surface is pierced with several slots, in particular facing the injectors in a
  • the ratio (void rate) of the sum of the surface areas of the perforations to the total surface area of the lateral surface is between 5% and 30% in the first compartment and between 2% and 15% in the second compartment.
  • a perforated rotary cylinder 4 is threaded on the body 1 and is
  • the cylinder 4 is perforated.
  • the ratio of the sum of the areas of the holes to the area of the total lateral surface of the cylinder 4 is between 30% and 90% and preferably between 40% and 80%.
  • the cylinder 4 has a thickness of between 1.5 and 30 mm and is generally made of stainless steel or bronze.
  • JD sleeve 5 is threaded on the rotary cylinder 4.
  • the ratio of the sum of the areas of the holes to the total lateral surface area of sleeve 5 is between 5% and 20% and preferably between 5% and 15%.
  • the sleeve 5 is obtained by nickel plating. It is microperforated with holes of diameter ranging from 50 to 500 microns and preferably between 200 and 400 microns. It has a thickness between 0.1 and 0.6 mm and preferably between 0.2 and 0.4 mm.
  • the interior of the drum 1 communicates with a pipe 7 for extracting air and water. Two injectors 8 and 9 respectively send along generators of the body 1 jets of water in the direction of the sleeve 5.
  • Figure 2 is a perspective view better illustrating an embodiment of the drum. It is constituted by the inner cylinder 1 of axis O which is split as well as the sheet forming the lateral surface along two slots 11 arranged between spacers 12 and being in the dial from 1 to 3 h. In the dial from 3 o'clock to 6 o'clock, a partition is made up of two sheets 13, 14 which together form a cylinder sector. The two sheets 13,14 extend in a cross-sectional view perpendicular to the axis O along substantially two radii. They are waterproof.
  • the first compartment 16 is connected to means making it possible to place it in depression. They are of the same type as the duct 7, but are distinct therefrom.
  • the void rate in Part 15 is 16%. It is larger than that corresponding to the slots 11.
  • the first compartment also includes a slot, not shown, placed at 6 o'clock opposite the point of tangency of the conveyor transporting the blank of nonwoven with the cylinder.
  • This slot is to facilitate the transfer of the layer of filaments over the portion of the cylinder facing the first compartment.
  • the embodiment shown in Figure 3 is identical to that of Figure 2, except that the rows of holes 18 of the part 15 are replaced by slots 19 which are not parallel to the axis O.
  • the installation shown in FIG. 4 comprises a spunbond tower 21 with a conveyor 22 leading, possibly with the interposition of a pressure roller 23, to a drum 24 according to the invention.
  • the conveyor 22 is tangent to the drum 24 at the lowest point thereof.
  • Two 25 injectors are provided of water opposite the part of the lateral surface of the second compartment.
  • One of the water injectors 25 is angularly arranged immediately adjacent to the first compartment 26, which means that one of the radial walls defining the second compartment 26 is in a position corresponding substantially to 4 o'clock while the first injector 25 is in a position a little before 4h.
  • the blank of nonwoven web which is deposited on the conveyor 22 is sucked on the drum 24 thanks to the suction provided by the first compartment 26, is hydraulically entangled by the injectors 25 and leaves the drum 24 to pass over an inclined conveyor 27 before entering an oven 28, then leaving it to be wound on a reel 29.
  • a spunbond tower 31 is again recognized which deposits a blank of nonwoven web 32, which is taken up by a first drum 33 according to the invention having an injector 34 and which is sent by a conveyor 35 to a second drum 36 according to the invention.
  • FIG. 6 a variant of FIG. 4 is recognized on which the filament ply is transferred to additional drums 41 and 42 to give it additional consolidation and patterns before entering the air drying oven.

Abstract

For the production of a nonwoven, spunbond filaments are fed (21) to a conveyor (22) to a perforated drum (24). The interior (26) of the drum is at an underpressure. Water injectors (25) spray water at the material around the drum surface, and is extracted by the inner suction.

Description

TAMBOUR POUR INSTALLATION DE PRODUCTION D'UNE NAPPE NON- TISSEE, PROCEDE DE PRODUCTION D'UNE NAPPE NON-TISSEE ET NAPPE NON-TISSEE OBTENUEDRUM FOR INSTALLATION FOR PRODUCING A NON-WOVEN TABLECLOTH, METHOD FOR PRODUCING A NON-WOVEN TABLECLOTH, AND NON-WOVEN TABLECLOTH OBTAINED
La présente invention se rapporte aux nappes non-tissées et à leur procédés et installations de production.The present invention relates to nonwoven webs and their production methods and installations.
Le brevet US 6,321 ,425 décrit un procédé de fabrication d'une nappe non-tissées qui consiste à envoyer une nappe, issue d'une tour spunbond qui comprend normalement successivement de haut en bas un générateur d'un rideau de filaments, notamment de filaments en matière plastique, un dispositif alténuateur à fente d'étirage des filaments du rideau un diffuseur et un convoyeur de réception des filaments, à une calandre qui consolide l'ébauche de nappe formée, puis à un tambour d'enchevêtrement par jets d'eau. Ce procédé a l'inconvénient d'altérer l'uniformité de la formation de la nappe et d'orienter les filaments préférentiellement dans le sens machine par l'étirage qui est appliqué à celle-ci.US Patent 6,321,425 describes a method of manufacturing a nonwoven web which consists of sending a web, from a spunbond tower which normally comprises successively from top to bottom a generator of a curtain of filaments, in particular of plastic filaments, an attenuating device with a slit for stretching the curtain filaments, a diffuser and a conveyor for receiving the filaments, to a calender which consolidates the blank of formed web, then to a tangle drum by jets of water. This process has the drawback of altering the uniformity of the formation of the sheet and of orienting the filaments preferentially in the machine direction by the stretching which is applied thereto.
L'invention remédie à cet inconvénient en permettant d'obtenir une nappe non tissée dont les propriétés sont sensiblement isotropes, c'est-à-dire sensiblement identiques que ce soit dans le sens machine ou dans le sens travers.The invention overcomes this drawback by making it possible to obtain a nonwoven web whose properties are substantially isotropic, that is to say substantially identical, whether in the machine direction or in the cross direction.
On y parvient par un tambour comportant un corps cylindrique fixe à surface latérale perforée entouré d'un manchon troué entraîné en rotation par rapport à l'axe du corps cylindrique, et des moyens destinés à créer une dépression à l'intérieur du corps. Suivant l'invention, une cloison imperméable à l'eau subdivise l'intérieur du corps en deux compartiments délimités par la cloison et par respectivement une première et une seconde partie de la surface latérale et mis tous deux en dépression par les moyens destinés à en créer.This is achieved by a drum comprising a fixed cylindrical body with a perforated lateral surface surrounded by a perforated sleeve driven in rotation relative to the axis of the cylindrical body, and means intended to create a depression inside the body. According to the invention, a waterproof partition subdivides the interior of the body into two compartments delimited by the partition and by respectively a first and a second part of the lateral surface and both put under vacuum by the means intended to create.
Le premier compartiment du tambour suivant l'invention permet de faire venir sur le tambour une ébauche de nappe se trouvant sur un convoyeur associé, sensiblement tangent au tambour en un point dit de contact (c'est le point où le convoyeur et le tambour sont le plus près l'un de l'autre sans pour autant se toucher), même si cette ébauche de nappe est encore peu consolidée, comme c'est le cas lorsqu'il s'agit de la nappe venant d'une tour spunbond, sans avoir besoin au préalable de calandrer l'ébauche de nappe ou de lui faire subir d'autres opérations impliquant un étirage qui portent définitivement atteinte à l'isotropie des propriétés de la nappe non-tissée finalement obtenue.The first drum compartment according to the invention makes it possible to bring on the drum a blank of sheet being on a conveyor associated, substantially tangent to the drum at a so-called point of contact (this is the point where the conveyor and the drum are closest to each other without touching each other), even if this blank of sheet is still poorly consolidated, as is the case when it comes to the tablecloth coming from a spunbond tower, without having to first calender the blank of the tablecloth or subject it to other operations involving drawing which permanently affect the isotropy of the properties of the nonwoven web finally obtained.
De préférence, le premier compartiment débute en regard du point de contact du convoyeur tangent au tambour et se termine en regard d'un point de la surface latérale en aval, dans le sens de rotation du manchon, du point de contact. Dès que l'ébauche de nappe a été ainsi appliquée au tambour par la dépression régnant dans le premier compartiment, elle est soumise à l'enchevêtrement par jets d'eau. Suivant un mode de réalisation, le premier compartiment s'étend sur un secteur cylindrique du corps défini, dans la vue en coupe transversale du corps cylindrique, sensiblement par deux rayons perpendiculaires entre eux, le premier compartiment occupant sensiblement ainsi le quart de l'intérieur du corps. De préférence, le secteur cylindrique occupé par le premier compartiment est disposé dans le deuxième cadran entre trois et six heures.Preferably, the first compartment begins opposite the point of contact of the conveyor tangent to the drum and ends opposite a point on the downstream side surface, in the direction of rotation of the sleeve, of the contact point. As soon as the blank of sheet has been thus applied to the drum by the vacuum prevailing in the first compartment, it is subjected to entanglement by water jets. According to one embodiment, the first compartment extends over a cylindrical sector of the defined body, in the cross-sectional view of the cylindrical body, substantially by two radii perpendicular to each other, the first compartment occupying substantially a quarter of the interior. from the body. Preferably, the cylindrical sector occupied by the first compartment is arranged in the second dial between three and six hours.
Les moyens destinés à créer une dépression peuvent être communs aux deux compartiments mais, suivant un mode de réalisation préféré, chaque compartiment a son propre moyen de création d'une dépression et, de préférence, la dépression est plus poussée dans le premier compartiment que dans le second. On peut créer notamment dans le premier compartiment une dépression comprise entre 30 et 400 mbars et dans le second compartiment une dépression comprise entre 30 et 300 mbars.The means intended to create a depression may be common to the two compartments, but, according to a preferred embodiment, each compartment has its own means of creating a depression and, preferably, the depression is greater in the first compartment than in the second. We can create in particular in the first compartment a depression between 30 and 400 mbar and in the second compartment a depression between 30 and 300 mbar.
Pour que le tambour puisse bien prendre l'ébauche de nappe, il vaut mieux que le rapport de la superficie totale des perforations, par unité de surface, à la superficie de la surface latérale où elles se trouvent, soit plus grand pour le premier compartiment que pour le second. Ce rapport peut être pour le premier compartiment compris entre 5% et 30%, tandis que pour le second compartiment il est compris entre 2% et 15%.In order for the drum to be able to take up the sheet blank well, it is better that the ratio of the total area of the perforations, per unit of area, to the area of the lateral surface where they are located, is greater for the first compartment than for the second. This ratio can be for the first compartment between 5% and 30%, while for the second compartment it is between 2% and 15%.
Les perforations de la surface latérale en regard du second compartiment sont notamment des fentes qui se trouvent en regard d'injecteurs d'eau sous pression sur la partie du manchon qui passe justement en regard de la partie de la surface latérale du second compartiment. La pression des jets est en général comprise entre 30 et 400 bars et le diamètre de chaque jet entre 75 et 200 microns. Un cylindre perforé rotatif rigide est monté à l'extérieur du corps cylindrique fixe et son diamètre intérieur est ajusté au diamètre extérieur du corps cylindrique pour que le jeu minimum ainsi conservé permette la rotation tout en minimisant les fuites d'air. Suivant la solution technique retenue pour la fabrication de ce cylindre rotatif, il est envisagé d'utiliser des liteaux plastiques montés sur ressorts pour améliorer l'étanchéité de la séparation des deux compartiments. Ce cylindre rotatif peut être une simple tôle perforée, un cylindre en bronze ou en acier inoxydable percé de trous disposés en hélice, un cylindre en nid d'abeille. Ce peut être un tube en tôle perforée roulé revêtu d'un manchon de drainage en tissu métallique grossier qui assure une bonne uniformité d'extraction de l'eau. Ce cylindre rotatif supporte un manchon perforé plus fin qui supporte effectivement les filaments et les fibres du non tissé lors de l'enchevêtrement hydraulique. La répartition des trous dans le manchon peut être aléatoire. Les trous peuvent être aussi ordonnés en étant alignés ou en quinconce. Les trous du manchon peuvent aussi être répartis dans des petites zones de perforations ordonnées réparties de manière aléatoire à la surface du manchon. Le manchon peut être constitué d'un tissu métallique ou en matière synthétique ou en mélange de tissu métallique et de matière synthétique. On préfère que le diamètre des trous du manchon soit compris entre 50 et 500 microns. On peut prévoir, pour obtenir des motifs sur la nappe, aussi d'enfiler une gaine ajourée sur le manchon dont les ajours ont au moins une dimension supérieure à 2 mm.The perforations in the lateral surface opposite the second compartment are in particular slots which are located opposite pressurized water injectors on the part of the sleeve which passes precisely opposite the part of the lateral surface of the second compartment. The pressure of the jets is generally between 30 and 400 bars and the diameter of each jet between 75 and 200 microns. A rigid rotary perforated cylinder is mounted outside the fixed cylindrical body and its inside diameter is adjusted to the outside diameter of the cylindrical body so that the minimum clearance thus preserved allows rotation while minimizing air leaks. According to the technical solution adopted for the manufacture of this rotary cylinder, it is envisaged to use plastic battens mounted on springs to improve the sealing of the separation of the two compartments. This rotary cylinder can be a simple perforated sheet, a bronze or stainless steel cylinder pierced with holes arranged in a helix, a honeycomb cylinder. It can be a tube of rolled perforated sheet coated with a coarse metallic fabric drainage sleeve which ensures good uniformity of water extraction. This rotary cylinder supports a thinner perforated sleeve which effectively supports the filaments and fibers of the nonwoven during hydraulic entanglement. The distribution of the holes in the sleeve can be random. The holes can also be ordered by being aligned or staggered. The holes of the sleeve can also be distributed in small areas of ordered perforations distributed randomly on the surface of the sleeve. The sleeve can be made of a metallic fabric or synthetic material or a mixture of metallic fabric and synthetic material. It is preferred that the diameter of the holes in the sleeve is between 50 and 500 microns. Provision may be made, in order to obtain patterns on the sheet, also to thread an openwork sheath on the sleeve, the openings of which have at least a dimension greater than 2 mm.
L'invention vise également une installation de production d'une nappe non-tissée comprenant une tour spunbond à convoyeur menant à un tambour suivant l'invention. De préférence, le convoyeur de la tour et le convoyeur tangent au tambour sont un seul et même convoyeur, mais il est possible aussi de prévoir deux convoyeurs distincts.The invention also relates to an installation for producing a nonwoven web comprising a spunbond conveyor tower leading to a drum according to the invention. Preferably, the tower conveyor and the tangent drum conveyor are one and the same conveyor, but it is also possible to provide two separate conveyors.
Suivant un mode de réalisation particulièrement préféré, le tambour est monté directement en aval de la tour. Par directement en aval, on entend, dans le présent mémoire, sans interposition d'un dispositif provoquant l'étirage de la nappe. Il n'y a donc pas de calandre, mais il peut y avoir un rouleau compacteur. L'invention vise aussi un procédé de production d'une nappe non- tissée, qui consiste à utiliser une installation suivant l'invention, et à régler la vitesse du convoyeur de la tour ou du convoyeur tangent à une valeur supérieure à la vitesse linéaire du tambour (décomptée sur le pourtour du 5 tambour). On obtient ainsi une nappe non-tissée dont le rapport de la résistance à la rupture dans le sens machine à celle dans le sens travers peut être inférieur à 1 en raison de cette différence de vitesse. Lorsque les vitesses sont sensiblement les mêmes on peut obtenir un rapport de la résistance à la rupture dans le sens machine à celle dans le sens travers de la nappe non-According to a particularly preferred embodiment, the drum is mounted directly downstream of the tower. By directly downstream is meant, in the present specification, without interposition of a device causing the stretching of the sheet. There is therefore no calender, but there may be a compactor roller. The invention also relates to a method of producing a nonwoven web, which consists in using an installation according to the invention, and in adjusting the speed of the tower conveyor or of the tangent conveyor to a value greater than the linear speed. of the drum (counted around the periphery of the 5 drum). A nonwoven web is thus obtained in which the ratio of the breaking strength in the machine direction to that in the cross direction can be less than 1 due to this difference in speed. When the speeds are substantially the same one can obtain a ratio of the breaking strength in the machine direction to that in the cross direction of the non-ply
10 tissée suivant l'invention inférieure à 1 ,2 et notamment d'environ 1 , en sorte que la nappe non-tissée suivant l'invention est particulièrement bien isotrope. Aux dessins annexés, donnés à titre d'exemple : la figure 1 est une vue en perspective avec arrachement d'une installation suivant l'invention10 woven according to the invention less than 1, 2 and in particular approximately 1, so that the nonwoven web according to the invention is particularly well isotropic. In the accompanying drawings, given by way of example: FIG. 1 is a cutaway perspective view of an installation according to the invention
15 la figure 2 et la figure 3 sont deux vues en perspective avec arrachement d'un tambour suivant l'invention et les figures 4 et 5 sont deux vues schématiques de deux variantes de l'installation suivant l'invention.Figure 2 and Figure 3 are two perspective views with cutaway of a drum according to the invention and Figures 4 and 5 are two schematic views of two variants of the installation according to the invention.
Le tambour représenté schématiquement à la figure 1 comprend unThe drum shown schematically in Figure 1 includes a
20 corps 1 intérieur composé d'un cylindre fixe d'un diamètre de 400 mm et d'une tôle formant la surface latérale. La surface latérale est perforée de perforations d'un diamètre de 8 mm dans une partie qui délimitera ce que l'on appellera ultérieurement le premier compartiment et la surface latérale est percée de plusieurs fentes notamment en regards des injecteurs dans une20 interior body 1 composed of a fixed cylinder with a diameter of 400 mm and a sheet forming the lateral surface. The lateral surface is perforated with perforations with a diameter of 8 mm in a part which will delimit what will later be called the first compartment and the lateral surface is pierced with several slots, in particular facing the injectors in a
25 partie qui délimitera ce qu'on appellera ultérieurement le second compartiment. Le rapport (taux de vide) de la somme des superficies des perforations à la superficie totale de la surface latérale est compris entre 5% et 30% dans le premier compartiment et entre 2% et 15% dans le second compartiment. Un cylindre rotatif perforé 4 est enfilé sur le corps 1 et est25 part which will delimit what will later be called the second compartment. The ratio (void rate) of the sum of the surface areas of the perforations to the total surface area of the lateral surface is between 5% and 30% in the first compartment and between 2% and 15% in the second compartment. A perforated rotary cylinder 4 is threaded on the body 1 and is
30 entraîné en rotation par un dispositif 2 d'entraînement à courroies. Le cylindre 4 est troué. Le rapport de la somme des superficies des trous à la superficie de la surface latérale totale du cylindre 4 est compris entre 30% et 90% et de préférence entre 40% et 80%. Le cylindre 4 a une épaisseur comprise entre 1 ,5 et 30 mm et est généralement en acier inoxydable ou en bronze. Un30 rotated by a belt drive device 2. The cylinder 4 is perforated. The ratio of the sum of the areas of the holes to the area of the total lateral surface of the cylinder 4 is between 30% and 90% and preferably between 40% and 80%. The cylinder 4 has a thickness of between 1.5 and 30 mm and is generally made of stainless steel or bronze. A
J D manchon 5 est enfilé sur le cylindre rotatif 4. Le rapport de la somme des superficies des trous à la superficie de surface latérale totale du manchon 5 est compris entre 5% et 20% et de préférence entre 5% et 15%. Le manchon 5 est obtenu par électrodéposition de nickel. Il est microperforé de trous de diamètre allant de 50 à 500 microns et de préférence compris entre 200 et 400 microns. Il a une épaisseur comprise entre 0,1 et 0,6 mm et de préférence comprise entre 0,2 et 0,4 mm. L'intérieur du tambour 1 communique avec un tuyau 7 d'extraction de l'air et de l'eau. Deux injecteurs 8 et 9 envoient respectivement suivant des génératrices du corps 1 des jets d'eau en direction du manchon 5.JD sleeve 5 is threaded on the rotary cylinder 4. The ratio of the sum of the areas of the holes to the total lateral surface area of sleeve 5 is between 5% and 20% and preferably between 5% and 15%. The sleeve 5 is obtained by nickel plating. It is microperforated with holes of diameter ranging from 50 to 500 microns and preferably between 200 and 400 microns. It has a thickness between 0.1 and 0.6 mm and preferably between 0.2 and 0.4 mm. The interior of the drum 1 communicates with a pipe 7 for extracting air and water. Two injectors 8 and 9 respectively send along generators of the body 1 jets of water in the direction of the sleeve 5.
La figure 2 est une vue en perspective illustrant mieux un mode de réalisation du tambour. Il est constitué par le cylindre 1 intérieur d'axe O qui est fendu ainsi que la tôle formant la surface latérale suivant deux fentes 11 disposées entre des entretoises 12 et se trouvant dans le cadran de 1 à 3 h. Dans le cadran de 3h à 6h est ménagée une cloison constituée de deux tôles 13,14 formant ensemble un secteur de cylindre. Les deux tôles 13,14 s'étendent suivant une vue en coupe transversale perpendiculaire à l'axe O suivant sensiblement deux rayons. Elles sont imperméables à l'eau. Elles délimitent entre elles avec la partie 15 de la surface latérale se trouvant entre 3h et 6h un premier compartiment 16 tandis que la cloison 13,14 délimite avec le reste du corps 1 un second compartiment 17 dans lequel débouchent les fentes 11. Des rangées de trous 18 ménagées sur la partie 15 de la surface latérale débouche dans le premier compartiment 16. Le premier compartiment 16 est relié à des moyens permettant de le mettre en dépression. Ils sont du même type que le conduit 7, mais en sont distincts. Le taux de vide de la partie 15 est de 16%. Il est plus grand que celui correspondant aux fentes 11. Dans une variante, le premier compartiment comprend aussi une fente non représenté, placée à 6h en regards du point de tangence du convoyeur transportant l'ébauche de non tissé avec le cylindre. Cette fente a pour but de faciliter le transfert de la nappe de filaments sur la portion du cylindre en vis à vis du premier compartiment. Le mode de réalisation représenté à la figure 3 est identique à celui de la figure 2, si ce n'est que les rangées de trous 18 de la partie 15 sont remplacées par des fentes 19 qui ne sont pas parallèles à l'axe O.Figure 2 is a perspective view better illustrating an embodiment of the drum. It is constituted by the inner cylinder 1 of axis O which is split as well as the sheet forming the lateral surface along two slots 11 arranged between spacers 12 and being in the dial from 1 to 3 h. In the dial from 3 o'clock to 6 o'clock, a partition is made up of two sheets 13, 14 which together form a cylinder sector. The two sheets 13,14 extend in a cross-sectional view perpendicular to the axis O along substantially two radii. They are waterproof. They delimit with each other with the part 15 of the lateral surface lying between 3 and 6 o'clock a first compartment 16 while the partition 13, 14 delimits with the rest of the body 1 a second compartment 17 into which open the slots 11. Rows of holes 18 formed on the part 15 of the lateral surface opens into the first compartment 16. The first compartment 16 is connected to means making it possible to place it in depression. They are of the same type as the duct 7, but are distinct therefrom. The void rate in Part 15 is 16%. It is larger than that corresponding to the slots 11. In a variant, the first compartment also includes a slot, not shown, placed at 6 o'clock opposite the point of tangency of the conveyor transporting the blank of nonwoven with the cylinder. The purpose of this slot is to facilitate the transfer of the layer of filaments over the portion of the cylinder facing the first compartment. The embodiment shown in Figure 3 is identical to that of Figure 2, except that the rows of holes 18 of the part 15 are replaced by slots 19 which are not parallel to the axis O.
L'installation représentée à la figure 4 comprend une tour 21 spunbond à convoyeur 22 menant, avec éventuellement interposition d'un rouleau 23 presseur, à un tambour 24 suivant l'invention. Le convoyeur 22 est tangent au tambour 24 au point le plus bas de celui-ci. Il est prévu deux injecteurs 25 d'eau en regard de la partie de la surface latérale du second compartiment. L'un des injecteurs 25 d'eau est disposé angulairement de manière immédiatement adjacente au premier compartiment 26, ce qui signifie que l'une des parois radiales définissant le second compartiment 26 se trouve en une position correspondant sensiblement à 4h tandis que le premier injecteur 25 se trouve en une position un peu avant 4h. L'ébauche de nappe non-tissée qui se dépose sur le convoyeur 22 est aspirée sur le tambour 24 grâce à l'aspiration fournie par le premier compartiment 26, est enchevêtrée par voie hydraulique par les injecteurs 25 et quitte le tambour 24 pour passer sur un convoyeur 27 incliné avant d'entrer dans un four 28, puis d'en sortir pour s'enrouler sur un enrouleur 29.The installation shown in FIG. 4 comprises a spunbond tower 21 with a conveyor 22 leading, possibly with the interposition of a pressure roller 23, to a drum 24 according to the invention. The conveyor 22 is tangent to the drum 24 at the lowest point thereof. Two 25 injectors are provided of water opposite the part of the lateral surface of the second compartment. One of the water injectors 25 is angularly arranged immediately adjacent to the first compartment 26, which means that one of the radial walls defining the second compartment 26 is in a position corresponding substantially to 4 o'clock while the first injector 25 is in a position a little before 4h. The blank of nonwoven web which is deposited on the conveyor 22 is sucked on the drum 24 thanks to the suction provided by the first compartment 26, is hydraulically entangled by the injectors 25 and leaves the drum 24 to pass over an inclined conveyor 27 before entering an oven 28, then leaving it to be wound on a reel 29.
A la figure 5, on reconnaît à nouveau une tour spunbond 31 qui dépose une ébauche de nappe 32 non-tissée, qui est prise par un premier tambour 33 suivant l'invention ayant un injecteur 34 et qui est envoyé par un convoyeur 35 à un second tambour 36 suivant l'invention.In FIG. 5, a spunbond tower 31 is again recognized which deposits a blank of nonwoven web 32, which is taken up by a first drum 33 according to the invention having an injector 34 and which is sent by a conveyor 35 to a second drum 36 according to the invention.
A la figure 6, on reconnaît une variante de la figure 4 sur laquelle la nappe de filament est transférée à des tambours supplémentaires 41 et 42 pour lui conférer une consolidation supplémentaire et des motifs avant d'entrer dans le four de séchage par air traversant. In FIG. 6, a variant of FIG. 4 is recognized on which the filament ply is transferred to additional drums 41 and 42 to give it additional consolidation and patterns before entering the air drying oven.

Claims

REVENDICATIONS
1 . Tambour comportant un corps (1 ) cylindrique fixe à surface latérale perforée entouré d'un cylindre (4) troué entraîné en rotation par rapport à l'axe (O) du corps (1) cylindrique, et des moyens (7) destinés à créer une dépression à l'intérieur du corps (1), caractérisé par une cloison (13,14) imperméable à l'eau subdivisant l'intérieur du corps (1 ) en deux compartiments (16,17) délimités par la cloison (13,14) et par respectivement une première (15) et une seconde partie de la surface latérale et mis, tous deux (16,17) en dépression par les moyens (7) destinés à en créer.1. Drum comprising a fixed cylindrical body (1) with a perforated lateral surface surrounded by a perforated cylinder (4) driven in rotation relative to the axis (O) of the cylindrical body (1), and means (7) intended to create a depression inside the body (1), characterized by a partition (13,14) waterproof dividing the interior of the body (1) into two compartments (16,17) delimited by the partition (13, 14) and respectively by a first (15) and a second part of the lateral surface and placed, both (16,17) in depression by the means (7) intended to create them.
2. Tambour selon la revendication 1 , caractérisé en ce qu'il est associé à un convoyeur (22) tangent au tambour (24) en un point de contact et le premier compartiment (16) débute en regard du point de contact et se termine en regard d'un point de la surface latérale en aval, dans le sens de rotation du manchon (4), du point de contact.2. Drum according to claim 1, characterized in that it is associated with a conveyor (22) tangent to the drum (24) at a point of contact and the first compartment (16) begins opposite the point of contact and ends opposite a point on the downstream side surface, in the direction of rotation of the sleeve (4), of the contact point.
3. Tambour selon la revendication 2, caractérisé en ce que le premier compartiment (16) s'étend sur un secteur du corps (1 ).3. Drum according to claim 2, characterized in that the first compartment (16) extends over a sector of the body (1).
4. Tambour selon l'une des revendications 1 à 3, caractérisé par des moyens destinés à créer une dépression propres à chaque compartiment (16,17).4. Drum according to one of claims 1 to 3, characterized by means intended to create a depression specific to each compartment (16,17).
5. Tambour selon l'une des revendication 1 à 4, caractérisé en ce que le rapport de la superficie totale des perforations, par unité de surface, à la superficie de la surface latérale où elles se trouvent est plus grand pour le premier compartiment (16) que pour le second (17). 5. Drum according to one of claims 1 to 4, characterized in that the ratio of the total area of the perforations, per unit area, to the area of the lateral surface where they are located is greater for the first compartment ( 16) than for the second (17).
6. Tambour selon l'une des revendications 1 à 5, caractérisé par un injecteur (8,9) d'eau sous pression sur la partie du cylindre (4) qui passe en regard de la partie de la surface latérale du compartiment (17).6. Drum according to one of claims 1 to 5, characterized by an injector (8,9) of pressurized water on the part of the cylinder (4) which passes opposite the part of the lateral surface of the compartment (17 ).
7. Tambour selon la revendication 6, caractérisé en ce que l'injecteur d'eau est disposé angulairement de manière immédiatement adjacente au premier compartiment (26).7. Drum according to claim 6, characterized in that the water injector is angularly arranged immediately adjacent to the first compartment (26).
8. Installation de production d'une nappe non-tissée, comprenant une tour (21) spunbond à convoyeur (22) menant à un tambour8. Installation for producing a nonwoven web, comprising a spunbond conveyor tower (21) leading to a drum
(24), caractérisé en ce que le tambour est tel que défini aux revendications précédentes.(24), characterized in that the drum is as defined in the preceding claims.
9. Installation suivant la revendication 8, caractérisé en ce que le convoyeur (22) de la tour (21) et le convoyeur tangent sont un seul et même convoyeur.9. Installation according to claim 8, characterized in that the conveyor (22) of the tower (21) and the tangent conveyor are one and the same conveyor.
10. Installation suivant la revendication 8 ou 9, caractérisé en ce que le tambour (24) est monté directement en aval de la tour, c'est-à-dire sans interposition d'un dispositif provoquant l'étirage de la nappe.10. Installation according to claim 8 or 9, characterized in that the drum (24) is mounted directly downstream of the tower, that is to say without interposition of a device causing the stretching of the sheet.
1 1 . Procédé de production d'une nappe non-tissée, caractérisé en ce que l'on utilise une installation suivant l'une des revendications 8 à 10 et la vitesse du convoyeur (22) de la tour et/ou du convoyeur tangent est supérieure à la vitesse linéaire du tambour (24).1 1. Method for producing a nonwoven web, characterized in that an installation according to one of Claims 8 to 10 is used and the speed of the conveyor (22) of the tower and / or of the tangent conveyor is greater than the linear speed of the drum (24).
12. Nappe non tissée, caractérisée en ce que le rapport de la résistance à la rupture dans le sens machine à celle dans le sens travers est inférieure à 1 ,2 et notamment d'environ 1 .12. Non-woven sheet, characterized in that the ratio of the breaking strength in the machine direction to that in the cross direction is less than 1, 2 and in particular approximately 1.
13. Nappe non tissée suivant le revendication 12, caractérisé en ce que ledit rapport est inférieur à 1. 13. Nonwoven sheet according to claim 12, characterized in that said ratio is less than 1.
EP03746325A 2002-04-12 2003-04-08 Drum for a production unit for a non-woven material, method for production of a non-woven material and non-woven material obtained thus Expired - Lifetime EP1499767B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07008823.2A EP1829997B1 (en) 2002-04-12 2003-04-08 Drum for an installation for the manufacture of a nonwoven, method of manufacture and nonwoven obtained

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0204604 2002-04-12
FR0204604A FR2838457B1 (en) 2002-04-12 2002-04-12 DRUM FOR INSTALLATION FOR PRODUCING A NON-WOVEN TABLECLOTH, METHOD FOR PRODUCING A NON-WOVEN TABLECLOTH, AND NON-WOVEN TABLECLOTH OBTAINED
PCT/FR2003/001101 WO2003087455A1 (en) 2002-04-12 2003-04-08 Drum for a production unit for a non-woven material, method for production of a non-woven material and non-woven material obtained thus

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EP07008823.2A Division EP1829997B1 (en) 2002-04-12 2003-04-08 Drum for an installation for the manufacture of a nonwoven, method of manufacture and nonwoven obtained
EP07008823.2 Division-Into 2007-05-02

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EP1499767A1 true EP1499767A1 (en) 2005-01-26
EP1499767B1 EP1499767B1 (en) 2010-12-01

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EP03746325A Expired - Lifetime EP1499767B1 (en) 2002-04-12 2003-04-08 Drum for a production unit for a non-woven material, method for production of a non-woven material and non-woven material obtained thus

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EP (2) EP1829997B1 (en)
JP (1) JP4313681B2 (en)
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FR2838457A1 (en) 2003-10-17
EP1829997B1 (en) 2018-03-28
DE60335182D1 (en) 2011-01-13
PL371286A1 (en) 2005-06-13
ATE490358T1 (en) 2010-12-15
CN1646752A (en) 2005-07-27
WO2003087455A1 (en) 2003-10-23
US7500293B2 (en) 2009-03-10
FR2838457B1 (en) 2004-08-27
US7350279B2 (en) 2008-04-01
TR201808600T4 (en) 2018-07-23
JP4313681B2 (en) 2009-08-12
CN100381625C (en) 2008-04-16
AU2003246794A1 (en) 2003-10-27
JP2005522596A (en) 2005-07-28
EP1499767B1 (en) 2010-12-01
US20080066274A1 (en) 2008-03-20
IL164472A0 (en) 2005-12-18
EP1829997A2 (en) 2007-09-05
PL207824B1 (en) 2011-02-28
EP1829997A3 (en) 2009-04-08
IL164472A (en) 2010-12-30
US20050115036A1 (en) 2005-06-02

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