EP1332251A1 - Installation for producing a spunbonded fabric web with filament diffuser and separation by electrostatic process - Google Patents

Installation for producing a spunbonded fabric web with filament diffuser and separation by electrostatic process

Info

Publication number
EP1332251A1
EP1332251A1 EP01976416A EP01976416A EP1332251A1 EP 1332251 A1 EP1332251 A1 EP 1332251A1 EP 01976416 A EP01976416 A EP 01976416A EP 01976416 A EP01976416 A EP 01976416A EP 1332251 A1 EP1332251 A1 EP 1332251A1
Authority
EP
European Patent Office
Prior art keywords
diffuser
filaments
curtain
separation
passage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01976416A
Other languages
German (de)
French (fr)
Inventor
Laurent Schmit
Rosario Maggio
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
Publication of EP1332251A1 publication Critical patent/EP1332251A1/en
Withdrawn legal-status Critical Current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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/005—Synthetic yarns or filaments
    • 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
    • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
    • 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
    • D04H3/14—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 thermoplastic yarns or filaments produced by welding
    • 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
    • D04H3/16—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 thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion

Definitions

  • the present invention relates to installations for producing a nonwoven web commonly known by the generic name of "spunbond” and which is formed by continuous synthetic filaments.
  • the generator of a curtain of filaments most often comprises an extruder intended to extrude a molten organic polymer in a die pierced with multiple holes so as to form a curtain of filaments and below the die a device for cooling the curtain filaments.
  • the curtain filament stretching device generally has opposite side walls and opposite end walls defining an oblong inlet slot for receiving the filaments as well as an oblong outlet slot from which the filaments exit.
  • a slit-shaped passage extends between the inlet and the outlet and the filaments pass there by being stretched by the introduction of an air current in the slit-shaped passage which is sufficient to stretch the filaments .
  • Below this device with a stretch for the filaments of the curtain is the diffuser which is intended to widen the curtain which enters it. As the diffuser diverges or is flared downwards, the curtain which passes there widens as it falls. The sheet which thus forms on the receiving conveyor located below the diffuser is thus more homogeneous.
  • the invention aims to further improve the homogeneity of the sheet, which also results in an improvement in appearance and mechanical strength, while guaranteeing the safety of operators.
  • a device for electrostatic separation of the filaments from each other this separation device being mounted higher than the bottom of the passage defined in the diffuser and lower than the top of the slit device.
  • This electrostatic separation device is notably mounted at the top of the diffuser, for example in the tallest three quarters and, preferably, in the tallest quarter. It can also be mounted at the bottom of the stretching slit device.
  • the supply voltage of the electrostatic separation device can be kept at a relatively low value, for example between 10 and 40 V, for which the filaments are not not pushed against the opposite wall, which avoids the formation of electric arcs which would produce serious defects in the sheet.
  • the installation's electricity consumption remains low.
  • the diffuser is at a distance from the stretching slit device, in particular at a distance of 3 to 20 mm with a preference of 5 to 13 mm.
  • This distance makes it possible to have a lateral air inlet on each side of the diffuser by venturi effect, the air ejected from the stretching slot at high speed (about 50 to 60 meters per second) generating a strong suction at the entrance to the diffuser.
  • the amount of air sucked in by venturi effect is a function of the speed of the air ejected through the stretching slot as well as the distance separating the stretching slot from the diffuser.
  • the width of the top of the diffuser passage is advantageous for the width of the top of the diffuser passage to be very slightly greater, for example, from 2 to 5 mm than that of the stretching slot which makes it face, so as to avoid that part of the filaments come out of the stretching slot touch the walls of the diffuser, which would cause the appearance of numerous defects. Good results have been obtained for a width of the stretching slot of between 5 and 15 mm and correspondingly a width of the top of the passage of the diffuser of between 7 and 20 mm.
  • At least one lateral opening and up to five lateral openings on one of the walls or on the two walls of the diffuser are provided at least one lateral opening and up to five lateral openings on one of the walls or on the two walls of the diffuser.
  • These openings which extend over the entire length of the fuser and which open to the outside make it possible to balance the static pressure which is established in the diffuser, which avoids the detachments of the air veins on the walls.
  • These openings can have widths of 3 to 10 mm.
  • the diffuser consists of two divergent plates, the angle between the two plates being between 3 ° and 30 ° and preferably between 3 and 10 ° and being able to be adjusted so as to optimize the slowing down of the air in the diffuser and the speed of the air ejected from the diffuser before the filaments are deposited on the conveyor.
  • This allows the speed to be adjusted according to the characteristics of the product produced, the grammage, the titer of the filaments and the like. Good results have been obtained with a diffuser of a length between 100 and 600 mm while the distance between the bottom of the diffuser and the conveyor is between 50 and 500 mm.
  • the electrostatic separation device comprises needles which, preferably, are set back from the passage defined in the diffuser, for example by about one mm relative to the surface of the wall, so as to prevent filaments from coming agglomerate with the needles during the start-up phase of the installation.
  • FIG. 1 is a perspective view of an installation according to the invention
  • FIG. 2 is a sectional view of the diffuser and
  • FIG 3 is a sectional view on a larger scale of the upper part of the diffuser of Figure 2.
  • the installation comprises an extruder 1 fed with synthetic polymer and a die 2 for forming a curtain of filaments 3.
  • the die is consisting of a plate comprising a multitude of holes having a diameter which depends on the extruded filaments. These holes are distributed over a plurality of parallel rows. There are for example 18 rows on a die width of 140 mm.
  • the outlet that is to say just below the die 2, is arranged a cooling assembly 4 making it possible to lower the temperature of the filaments and composed of a plurality of successive zones 4a, 4b, 4c which allows the filament curtain 3 to be subjected to fluxes the speed and temperature of which can be adjusted.
  • the length of this cooling zone can be of the order of 1200 mm.
  • a conventional slot 5 stretching device 5 Downstream and therefore below this cooling assembly 4 is arranged a conventional slot 5 stretching device 5. It is composed of two walls defining between them a passage in the form of a slot F, inside of which air is injected under pressure, for example under 0.5 bar. This slit stretching device allows the curtain of filaments to be drawn in and entrained by air streams at high speeds, which stretches the filaments.
  • a device for electrostatic separation of the filaments as shown in FIG. 3.
  • This device essentially comprises two plates 8 and 9 facing each other , in one of which is provided a housing for receiving a bar 10 of an electrically conductive material, bar from which come, in the direction of the wall 8, needles 11 which nevertheless do not protrude from the inner face 12 of the wall 9.
  • the wall 8 and at the top of the diffuser and the bar 10 are connected to a current generator 13, so that an electric field is established between the needles 11 and the wall 8.
  • a diffuser 6 In below the device 5 with stretching slot is mounted a diffuser 6.
  • This diffuser 6 shown in particular in Figure 2 has two walls 14, 15 forming an angle of 5 ° between them and each provided with three openings 16 extending over any the l ength.
  • the diffuser 6 is located 10 mm from the bottom of the stretching device 5 and the width d of the stretching slot is just less than the width D of the top of the passage defined by the diffuser 6.
  • the electrostatic device 17 In the wall 15 of the diffuser 6 is mounted the electrostatic device 17 of the same type as the device 10, 11, 13 shown in FIG. 3.
  • the electrostatic separator is located at the bottom of the stretch slot device.

Abstract

The invention concerns an installation for producing a spunbonded fabric web comprising a diffuser (6) defining for the drawn filaments a passage with diverging cross-section and a conveyor (7) receiving the filaments coming out of the diffuser. The uniformity of the web is enhanced by means of a device separating the filaments from one another by electrostatic process mounted at a higher level higher than the bottom of the passage.

Description

Installation de production d'une nappe non tissée à diffuseur et à séparation des filaments par voie électrostatique .Installation for producing a nonwoven web with a diffuser and separation of the filaments by electrostatic means.
La présente invention se rapporte aux installations de production d'une nappe non tissée désignée couramment sous le nom générique de "spunbond" et qui est formée par des filaments synthétiques continus.The present invention relates to installations for producing a nonwoven web commonly known by the generic name of "spunbond" and which is formed by continuous synthetic filaments.
On connaît déjà une installation de production d'une nappe non tissée qui comprend successivement de haut en bas un générateur d'un rideau de filaments, un dispositif à fente d'étirage des filaments du rideau, un diffuseur définissant pour les filaments étirés un passage de section, suivant l'épaisseur du rideau, jamais décroissante et, au moins une fois, croissante et un convoyeur de réception des filaments sortant du diffuseur.There is already known an installation for producing a nonwoven web which successively comprises from top to bottom a generator of a curtain of filaments, a device with a stretch for drawing the curtain filaments, a diffuser defining for the drawn filaments a passage of section, according to the thickness of the curtain, never decreasing and, at least once, increasing and a conveyor for receiving the filaments leaving the diffuser.
Dans une installation de ce genre, dans laquelle l'étirage est réalisé par une fente continue sur toute la largeur de production, la charge électrostatique des filaments avant l'unité d'étirage, comme on le propose au TJS-Α-3.325.906 pour une machine à dispositif d'étirage dit par "guns", provoquerait le collage des filaments sur les parois de l'unité d'étirage. De plus, un dispositif électrostatique placé en entrée d'étirage représenterait un réel danger pour les opérateurs amenés à intervenir pendant la production dans cette zone située entre la sortie de la filière et la zone d'étirage. Pour pallier ces risques pour la sécurité des personnes, il faudrait condamner l'accès des opérateurs à cette zone pendant la production, ce qui constituerait un inconvénient supplémentaire.In an installation of this kind, in which the stretching is carried out by a continuous slit over the entire production width, the electrostatic charge of the filaments before the stretching unit, as is proposed in TJS-Α-3.325.906 for a machine with a drawing device called "guns", would cause the sticking of the filaments on the walls of the drawing unit. In addition, an electrostatic device placed at the stretching inlet would represent a real danger for operators brought to intervene during production in this area located between the outlet of the die and the stretching area. To mitigate these risks for personal safety, operators should be prevented from accessing this area during production, which would constitute an additional disadvantage.
Le générateur d'un rideau de filaments comporte le plus souvent une extrudeuse destinée à extruder un polymère organique fondu dans une filière percée de multiple trous de manière à former un rideau de filaments et en-dessous de la filière un dispositif de refroidissement du rideau de filaments. Le dispositif à fente d'étirage des filaments du rideau comporte généralement des parois latérales opposées et des parois d'extrémité opposées définissant une fente d'entrée oblongue de réception des filaments ainsi qu'une fente oblongue de sortie de laquelle les filaments sortent. Un passage en forme de fente s'étend entre l'entrée et la sortie et les filaments y passent en étant étirés grâce à l'introduction d'un courant d'air dans le passage en forme de fente qui est suffisant pour étirer les filaments. En dessous de ce dispositif à fente d'étirage des filaments du rideau se trouve le diffuseur qui est destiné à élargir le rideau qui y entre. Comme le diffuseur diverge ou est évasé vers le bas, le rideau qui y passe s'élargit au fur et à mesure qu'il tombe. La nappe qui se forme ainsi sur le convoyeur de réception se trouvant en dessous du diffuseur est ainsi plus homogène.The generator of a curtain of filaments most often comprises an extruder intended to extrude a molten organic polymer in a die pierced with multiple holes so as to form a curtain of filaments and below the die a device for cooling the curtain filaments. The curtain filament stretching device generally has opposite side walls and opposite end walls defining an oblong inlet slot for receiving the filaments as well as an oblong outlet slot from which the filaments exit. A slit-shaped passage extends between the inlet and the outlet and the filaments pass there by being stretched by the introduction of an air current in the slit-shaped passage which is sufficient to stretch the filaments . Below this device with a stretch for the filaments of the curtain is the diffuser which is intended to widen the curtain which enters it. As the diffuser diverges or is flared downwards, the curtain which passes there widens as it falls. The sheet which thus forms on the receiving conveyor located below the diffuser is thus more homogeneous.
L'invention vise à améliorer encore l'homogénéité de la nappe, ce qui se traduit également par une amélioration de l'aspect et de la résistance mécanique , tout en garantissant la sécurité des opérateurs.The invention aims to further improve the homogeneity of the sheet, which also results in an improvement in appearance and mechanical strength, while guaranteeing the safety of operators.
Suivant l'invention, il est prévu un dispositif de séparation par voie électrostatique des filaments les uns des autres, ce dispositif de séparation étant monté plus haut que le bas du passage défini dans le diffuseur et plus bas que le haut du dispositif à fente. Ce dispositif de séparation par voie électrostatique est notamment monté en haut du diffuseur, par exemple dans les trois quarts les plus hauts et, de préférence, dans le quart le plus haut. Il peut être aussi monté au bas du dispositif à fente d'étirage.According to the invention, there is provided a device for electrostatic separation of the filaments from each other, this separation device being mounted higher than the bottom of the passage defined in the diffuser and lower than the top of the slit device. This electrostatic separation device is notably mounted at the top of the diffuser, for example in the tallest three quarters and, preferably, in the tallest quarter. It can also be mounted at the bottom of the stretching slit device.
En soumettant les filaments du rideau à l'action du dispositif électrostatique qui a pour effet de créer une répulsion mutuelle des filaments du rideau quelle que soit leur position dans le rideau, juste avant ou au début du diffuseur évasé, on combine l'effet d'élargissement du rideau par la forme évasée du diffuseur qui se manifeste essentiellement sur les faces du rideau et 1 ' effet électrostatique qui se manifeste aussi au coeur du rideau, sans pour autant que l'action électrostatique sur les filaments sur les faces du rideau n'ait tendance à mettre les filaments trop en contact avec les parois du diffuseur, puisque celui-ci justement s'évase. En outre, en agissant par le dispositif de séparation par voie électrostatique sur les filaments alors qu'ils sont encore bien réunis, soit à la sortie du dispositif à fente d'étirage soit au début du diffuseur, on peut maintenir la tension d'alimentation du dispositif de séparation par voie électrostatique à une valeur relativement basse par exemple comprise entre 10 et 40 V, pour laquelle les filaments ne sont pas repoussés contre la paroi opposée, ce qui évite la formation d'arcs électriques qui produiraient de graves défauts dans la nappe. La consommation d'électricité de l'installation reste petite . De préférence, le diffuseur est à distance du dispositif à fente d'étirage, notamment à une distance de 3 à 20 mm avec une préférence de 5 à 13 mm. Cette distance permet d'avoir une entrée d'air latérale de chaque côté du diffuseur par effet venturi , l'air éjecté de la fente d'étirage à grande vitesse (environ 50 à 60 mètres à la seconde) engendrant une forte aspiration à l'entrée du diffuseur. La quantité d'air aspirée par effet venturi est fonction de la vitesse de l'air éjecté par la fente d'étirage ainsi que de la distance séparant la fente d'étirage du diffuseur.By subjecting the curtain filaments to the action of the electrostatic device which has the effect of creating a mutual repulsion of the curtain filaments regardless of their position in the curtain, just before or at the start of the flared diffuser, the effect d widening of the curtain by the flared shape of the diffuser which manifests itself essentially on the faces of the curtain and the electrostatic effect which also manifests itself at the heart of the curtain, without however the electrostatic action on the filaments on the faces of the curtain n 'tends to put the filaments too much in contact with the walls of the diffuser, since it precisely flares. In addition, by acting by the electrostatic separation device on the filaments while they are still well joined, i.e. the output of the stretching slit device is at the start of the diffuser, the supply voltage of the electrostatic separation device can be kept at a relatively low value, for example between 10 and 40 V, for which the filaments are not not pushed against the opposite wall, which avoids the formation of electric arcs which would produce serious defects in the sheet. The installation's electricity consumption remains low. Preferably, the diffuser is at a distance from the stretching slit device, in particular at a distance of 3 to 20 mm with a preference of 5 to 13 mm. This distance makes it possible to have a lateral air inlet on each side of the diffuser by venturi effect, the air ejected from the stretching slot at high speed (about 50 to 60 meters per second) generating a strong suction at the entrance to the diffuser. The amount of air sucked in by venturi effect is a function of the speed of the air ejected through the stretching slot as well as the distance separating the stretching slot from the diffuser.
Lorsque le dispositif de séparation par voie électrostatique est situé dans le haut du diffuseur, il est avantageux que la largeur du haut du passage du diffuseur soit très légèrement supérieure par exemple de 2 à 5 mm à celle de la fente d'étirage qui lui fait face, de façon à éviter qu'une partie des filaments sortent de la fente d'étirage touchent les parois du diffuseur, ce qui entraînerait l'apparition de nombreux défauts. On a obtenu de bons résultats pour une largeur de la fente d'étirage comprise entre 5 et 15 mm et de manière correspondante une largeur du haut du passage du diffuseur comprise entre 7 et 20 mm.When the electrostatic separation device is located at the top of the diffuser, it is advantageous for the width of the top of the diffuser passage to be very slightly greater, for example, from 2 to 5 mm than that of the stretching slot which makes it face, so as to avoid that part of the filaments come out of the stretching slot touch the walls of the diffuser, which would cause the appearance of numerous defects. Good results have been obtained for a width of the stretching slot of between 5 and 15 mm and correspondingly a width of the top of the passage of the diffuser of between 7 and 20 mm.
De préférence, il est prévu au moins une ouverture latérale et jusqu'à cinq ouvertures latérales sur l'une des parois ou sur les deux parois du diffuseur. Ces ouvertures qui s ' étendent sur toute la longueur du di fuseur et qui débouchent à l'extérieur permettent d'équilibrer la pression statique qui s'établit dans le diffuseur, ce qui évite les décollements des veines d'air sur les parois. Ces ouvertures peuvent avoir des largeurs de 3 à 10 mm.Preferably, there is provided at least one lateral opening and up to five lateral openings on one of the walls or on the two walls of the diffuser. These openings which extend over the entire length of the fuser and which open to the outside make it possible to balance the static pressure which is established in the diffuser, which avoids the detachments of the air veins on the walls. These openings can have widths of 3 to 10 mm.
Suivant un mode de réalisation, le diffuseur est constitué de deux plaques divergentes, l'angle entre les deux plaques étant compris entre 3° et 30° et de préférence entre 3 et 10° et pouvant être réglé de manière à optimiser le ralentissement de l'air dans le diffuseur et la vitesse de l'air éjecté du diffuseur avant la dépose des filaments sur le convoyeur. Cela permet d'ajuster la vitesse en fonction des caractéristiques du produit fabriqué, du grammage, du titre des filaments et autres. On a obtenu de bons résultats avec un diffuseur d'une longueur comprise entre 100 et 600 mm alors que la distance entre le bas du diffuseur et le convoyeur est comprise entre 50 et 500 mm. Le dispositif de séparation électrostatique comporte des aiguilles qui, de préférence, sont en retrait du passage défini dans le diffuseur, par exemple d'un mm environ par rapport à la surface de la paroi, de façon à empêcher que des filaments ne viennent s'agglomérer aux aiguilles pendant la phase de démarrage de l'installation.According to one embodiment, the diffuser consists of two divergent plates, the angle between the two plates being between 3 ° and 30 ° and preferably between 3 and 10 ° and being able to be adjusted so as to optimize the slowing down of the air in the diffuser and the speed of the air ejected from the diffuser before the filaments are deposited on the conveyor. This allows the speed to be adjusted according to the characteristics of the product produced, the grammage, the titer of the filaments and the like. Good results have been obtained with a diffuser of a length between 100 and 600 mm while the distance between the bottom of the diffuser and the conveyor is between 50 and 500 mm. The electrostatic separation device comprises needles which, preferably, are set back from the passage defined in the diffuser, for example by about one mm relative to the surface of the wall, so as to prevent filaments from coming agglomerate with the needles during the start-up phase of the installation.
Aux dessins annexés, donnés uniquement à titre d' exemple :In the accompanying drawings, given solely by way of example:
La figure 1 est une vue en perspective d'une installation suivant l'invention, La figure 2 est une vue en coupe du diffuseur et,FIG. 1 is a perspective view of an installation according to the invention, FIG. 2 is a sectional view of the diffuser and,
La figure 3 est une vue en coupe à plus grande échelle de la partie supérieure du diffuseur de la figure 2. L'installation comprend une extrudeuse 1 alimentée en polymère synthétique et une filière 2 permettant de former un rideau de filaments 3. La filière est constituée d'une plaque comprenant une multitude de trous ayant un diamètre qui dépend des filaments extrudés . Ces trous sont répartis sur une pluralité de rangées parallèles. Il y a par exemple 18 rangées sur une largeur de filière de 140 mm. Δ la sortie, c'est-à-dire juste en dessous de la filière 2, est disposé un ensemble de refroidissement 4 permettant d'abaisser la température des filaments et composés d'une pluralité de zones successives 4a, 4b, 4c ce qui permet de soumettre le rideau de filaments 3 à des flux d'air dont la vitesse et la température peuvent être réglées . La longueur de cette zone de refroidissement peut être de l'ordre de 1200 mm.Figure 3 is a sectional view on a larger scale of the upper part of the diffuser of Figure 2. The installation comprises an extruder 1 fed with synthetic polymer and a die 2 for forming a curtain of filaments 3. The die is consisting of a plate comprising a multitude of holes having a diameter which depends on the extruded filaments. These holes are distributed over a plurality of parallel rows. There are for example 18 rows on a die width of 140 mm. Δ the outlet, that is to say just below the die 2, is arranged a cooling assembly 4 making it possible to lower the temperature of the filaments and composed of a plurality of successive zones 4a, 4b, 4c which allows the filament curtain 3 to be subjected to fluxes the speed and temperature of which can be adjusted. The length of this cooling zone can be of the order of 1200 mm.
En aval et donc en dessous de cet ensemble 4 de refroidissements est disposé un dispositif 5 d'étirage à fente F classique. Il est composé de deux parois définissant entre elles un passage en forme de fente F, à l'intérieur de laquelle est injecté de l'air sous pression par exemple sous 0,5 bar. Ce dispositif d'étirage à fente permet d'aspirer le rideau de filaments et de l'entraîner par des veines d'air à grandes vitesses, ce qui étire les filaments.Downstream and therefore below this cooling assembly 4 is arranged a conventional slot 5 stretching device 5. It is composed of two walls defining between them a passage in the form of a slot F, inside of which air is injected under pressure, for example under 0.5 bar. This slit stretching device allows the curtain of filaments to be drawn in and entrained by air streams at high speeds, which stretches the filaments.
Dans un mode préféré de réalisation, il est prévu après le dispositif 5 à fente d'étirage un dispositif de séparation par voie électrostatique des filaments tel qu'il est représenté à la figure 3. Ce dispositif comprend essentiellement deux plaques 8 et 9 en regard, dans l'une desquelles est ménagée un logement de réception d'une barre 10 en un matériau conducteur de l'électricité, barre de laquelle sont issues, en direction de la paroi 8, des aiguilles 11 qui néanmoins ne font pas saillie de la face 12 intérieure de la paroi 9. La paroi 8 et au sommet du diffuseur et la barre 10 sont reliées à un générateur 13 de courant, en sorte qu'il s'établit un champ électrique entre les aiguilles 11 et la paroi 8. En dessous du dispositif 5 à fente d'étirage est monté un diffuseur 6. Ce diffuseur 6 représenté notamment à la figure 2 comporte deux parois 14, 15 faisant entre elles un angle de 5° et munie chacune de trois ouvertures 16 s ' étendant sur toute la longueur. Le diffuseur 6 est situé à 10 mm du bas du dispositif 5 d'étirage et la largeur d de la fente d'étirage est juste inférieure à la largeur D du haut du passage défini par le diffuseur 6. Dans la paroi 15 du diffuseur 6 est monté le dispositif 17 électrostatique du même type que le dispositif 10, 11, 13 représenté à la figure 3.In a preferred embodiment, there is provided after the stretching device 5 a device for electrostatic separation of the filaments as shown in FIG. 3. This device essentially comprises two plates 8 and 9 facing each other , in one of which is provided a housing for receiving a bar 10 of an electrically conductive material, bar from which come, in the direction of the wall 8, needles 11 which nevertheless do not protrude from the inner face 12 of the wall 9. The wall 8 and at the top of the diffuser and the bar 10 are connected to a current generator 13, so that an electric field is established between the needles 11 and the wall 8. In below the device 5 with stretching slot is mounted a diffuser 6. This diffuser 6 shown in particular in Figure 2 has two walls 14, 15 forming an angle of 5 ° between them and each provided with three openings 16 extending over any the l ength. The diffuser 6 is located 10 mm from the bottom of the stretching device 5 and the width d of the stretching slot is just less than the width D of the top of the passage defined by the diffuser 6. In the wall 15 of the diffuser 6 is mounted the electrostatic device 17 of the same type as the device 10, 11, 13 shown in FIG. 3.
En dessous du diffuseur 6 se trouve un convoyeur 7 classique . Dans une variante, le séparateur par voie électrostatique est situé au bas du dispositif à fente d ' étirage . Below the diffuser 6 is a conventional conveyor 7. Alternatively, the electrostatic separator is located at the bottom of the stretch slot device.

Claims

R E V E N D I C A T I O N S
1. Installation de production d'une nappe non tissée comprenant, de haut en bas, un générateur (l, 2, 4) d'un rideau de filaments (3) , un dispositif (5) à Eente d'étirage des filaments du rideau, un diffuseur (6) définissant pour les filaments étirés un passage de section, suivant la largeur du rideau, jamais décroissante et, au moins une fois, croissante et destiné à élargir le rideau entrant dans le passage et un convoyeur (7) de réception des filaments sortant du diffuseur (6) , caractérisée par un dispositif (17) de séparation par voie électrostatique des filaments les uns des autres monté plus haut que le bas du passage et plus bas que le haut du dispositif à fente .1. Installation for producing a nonwoven web comprising, from top to bottom, a generator (1, 2, 4) of a curtain of filaments (3), a device (5) with a stretch of filaments of the curtain, a diffuser (6) defining for the drawn filaments a section passage, along the width of the curtain, never decreasing and, at least once, increasing and intended to widen the curtain entering the passage and a conveyor (7) reception of the filaments leaving the diffuser (6), characterized by a device (17) for electrostatic separation of the filaments from one another mounted higher than the bottom of the passage and lower than the top of the slit device.
2. Installation suivant la revendication 1, caractérisée en ce que le dispositif (17) de séparation est monté au bas du dispositif (5) à fente d'étirage.2. Installation according to claim 1, characterized in that the device (17) for separation is mounted at the bottom of the device (5) with stretching slot.
3. Installation suivant la revendication 1, caractérisée en ce que le dispositif (17) de séparation est monté en haut du diffuseur (6) . 3. Installation according to claim 1, characterized in that the device (17) for separation is mounted at the top of the diffuser (6).
4. Installation suivant la revendication 3, caractérisée en ce que le dispositif (17) de séparation est monté dans les trois quarts les plus hauts du diffuseur (6) et de préférence dans le quart le plus haut.4. Installation according to claim 3, characterized in that the device (17) for separation is mounted in the highest three quarters of the diffuser (6) and preferably in the highest quarter.
5. Installation suivant l'une des revendications précédentes, caractérisée en ce que le diffuseur (6) est monté à distance du dispositif (5) à fente d'étirage de préférence à une distance de 3 à 20 mm.5. Installation according to one of the preceding claims, characterized in that the diffuser (6) is mounted at a distance from the device (5) with stretching slot preferably at a distance of 3 to 20 mm.
6. Dispositif suivant l'une des revendications précédentes, caractérisé en ce que le diffuseur (6) comporte des ouvertures (16) latérales s ' étendant sur toute la longueur .6. Device according to one of the preceding claims, characterized in that the diffuser (6) has lateral openings (16) extending over the entire length.
7. Dispositif suivant la revendication 2, caractérisé en ce que la largeur (d) de la fente d'étirage est plus petite que la largeur (D) du passage au haut du diffuseur.7. Device according to claim 2, characterized in that the width (d) of the stretching slot is smaller than the width (D) of the passage at the top of the diffuser.
8. Installation suivant l'une des revendications 3 à 7, caractérisée en ce que le dispositif de séparation comporte des aiguilles (il) qui sont en retrait du passage défini dans le diffuseur (6) . 8. Installation according to one of claims 3 to 7, characterized in that the separation device comprises needles (II) which are set back from the passage defined in the diffuser (6).
EP01976416A 2000-10-20 2001-10-12 Installation for producing a spunbonded fabric web with filament diffuser and separation by electrostatic process Withdrawn EP1332251A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0013446A FR2815647B1 (en) 2000-10-20 2000-10-20 INSTALLATION FOR PRODUCING A NONWOVEN FABRIC WITH A DIFFUSER AND FOR SEPARATING FILAMENTS ELECTROSTATICALLY
FR0013446 2000-10-20
PCT/FR2001/003163 WO2002034990A1 (en) 2000-10-20 2001-10-12 Installation for producing a spunbonded fabric web with filament diffuser and separation by electrostatic process

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EP (1) EP1332251A1 (en)
AU (1) AU2001295696A1 (en)
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AU2001295696A1 (en) 2002-05-06
FR2815647A1 (en) 2002-04-26
FR2815647B1 (en) 2003-02-14
US6979186B2 (en) 2005-12-27
WO2002034990A1 (en) 2002-05-02

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