EP3908687A1 - Unit and method for producing non-wovens - Google Patents

Unit and method for producing non-wovens

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Publication number
EP3908687A1
EP3908687A1 EP19828809.4A EP19828809A EP3908687A1 EP 3908687 A1 EP3908687 A1 EP 3908687A1 EP 19828809 A EP19828809 A EP 19828809A EP 3908687 A1 EP3908687 A1 EP 3908687A1
Authority
EP
European Patent Office
Prior art keywords
speed
ratio
conveyor belt
drum
circumferential speed
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
EP19828809.4A
Other languages
German (de)
French (fr)
Other versions
EP3908687B1 (en
Inventor
Frédéric NOELLE
Laurent Schmit
Christophe MUFFAT-JEANDET
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
Andritz 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
Priority claimed from FR1900150A external-priority patent/FR3091541B1/en
Application filed by Andritz Perfojet SAS filed Critical Andritz Perfojet SAS
Publication of EP3908687A1 publication Critical patent/EP3908687A1/en
Application granted granted Critical
Publication of EP3908687B1 publication Critical patent/EP3908687B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • D04H1/736—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged characterised by the apparatus for arranging fibres
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/02—Carding machines
    • D01G15/04—Carding machines with worker and stripper or like rollers operating in association with a main cylinder
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/02—Carding machines
    • D01G15/12—Details
    • D01G15/36—Driving or speed control arrangements
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/02—Carding machines
    • D01G15/12—Details
    • D01G15/46—Doffing or like arrangements for removing fibres from carding elements; Web-dividing apparatus; Condensers
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres

Definitions

  • the present invention relates to an installation and a process for the production of nonwovens by the dry process.
  • Installations for the production of dry nonwovens generally include a section for forming a veil or a sheet, which comprises one or two cards, followed by a consolidation section by water jets, generally on several rotary cylinders and successive conveyors, then a water extraction section by high vacuum, most often, then, a drying section and finally a winding.
  • an installation has been found which makes it possible to produce nonwovens by the dry route with an area weight even of between 40 and 80 g / m 2 by direct carding at high rates and with resistance ratios.
  • machine direction / cross direction of less than 2.5 / 1, even less than 2/1, even less than 1.5 / 1 and very close to 1.0 well suited to qualitative markets, such as professional wipes or cosmetic masks, where nonwovens are desired to be as light as possible, provided that the rotational speeds of the elements of which the installation is made are suitably adjusted.
  • Productivity is increased by 40 to 50% compared to an installation with spreader-lapper and stretcher of the same width in the production of light nonwovens.
  • the invention requires only a carding machine and not other additional machines such as lapper and stretcher, requires much less investment, implements much less moving mechanical elements (rollers, belts, for example) and consumes less energy per kilo of product.
  • the installation for producing dry nonwovens comprises a card drum driven in rotation in a first direction of rotation and at a first circumferential speed of rotation by first drive means, giving a veil fiber. It is characterized in that it comprises, immediately downstream of the drum in the direction of passage of the fibers of the installation, a transfer cylinder driven in rotation in a second direction of rotation, contrary to the first direction of rotation, and at a second circumferential speed of rotation by second rotational drive means, the second speed being greater than the first speed, the transfer cylinder having at the periphery a lining comprising a plurality of teeth inclined relative to the radius of the cylinder and oriented in the second direction of rotation, and immediately downstream of the transfer cylinder, a system comprising, from upstream to downstream in succession immediately, at least one doffer, at least one condenser, at least one detacher, a first endless conveyor belt , a suction drum and a second endless conveyor belt, the suction drum being adjacent to the upper strand of the first and second conveyor
  • the ratio of the second speed to the first speed is greater than or equal to 1.6, and better still greater than or equal to 1.7.
  • the invention also relates to a process for producing nonwovens, in which the installation according to the invention is operated according to the speed ratios according to the invention.
  • a nonwoven product based on artificial and / or synthetic fibers such as viscose, lyocell, polyester or polypropylene, of mass per square meter of between 40 and 80 g / m 2 and whose fibers have a strength between 1.3 and 2.2 dtex and have a length between 30 and 50 mm, the ratio of the tensile strength machine direction / cross direction goes from 1.0 to 1.5 and the elongation in machine direction is between 35 and 70% and preferably between 40 and 60% and the elongation in the cross direction is between 70 and 130% and preferably between 90 and 125%.
  • artificial and / or synthetic fibers such as viscose, lyocell, polyester or polypropylene
  • the resistance measurements in the long direction (MD) and in the cross direction (CD), and of mass per m 2 are carried out according to the ERT standards of EDANA (European Disposables And Nonwovens Association), namely:
  • a sample is conditioned for 24 hours and the test is carried out at 23 ° C and a relative humidity of 50%.
  • At least 3 samples are cut with an area of at least 50,000 mm 2 with a cutting device called a cutter.
  • Each sample is weighed on a laboratory balance with an accuracy of 0.1% of the mass of the weighed samples.
  • a sample is conditioned for 24 hours and the test is carried out at 23 ° C and a relative humidity of 50%.
  • a dynamometer is used for the test, comprising a set of fixed jaws and a set of movable jaws moving at a constant speed. The jaws of the dynamometer have a useful width of 50 mm.
  • the dynamometer is equipped with a recorder, which plots the curve of the tensile force as a function of the elongation. 5 samples are cut of 50 mm, more or less 0.5 mm in width and 250 mm in length, this in the long direction and in the cross direction of the nonwoven.
  • the samples are tested one by one, at a constant tensile speed of 100 mm per minute and with an initial distance between jaws of 200 mm.
  • the dynamometer records the curve of the tensile force in Newtons as a function of the elongation.
  • the invention also relates to a process for producing the above nonwoven product, in which the installation according to the invention is operated by giving its various elements the rotational speeds making it possible to obtain the desired ratios.
  • the diameter of the transfer cylinder is preferably less than that of the card drum.
  • the ratio is, for example, between 0.40 and 0.50.
  • the card drum has a diameter between 900 and 1500.
  • the angle of inclination of the teeth with the radius can be between 70 ° and 80 °.
  • the radial height of the teeth is advantageously between 0.7 and 1.5 mm.
  • the teeth are distributed uniformly over the entire periphery of the transfer cylinder, the interval between two teeth neighbors being between 1.3 and 2.3 mm.
  • the width of the teeth at their base is between 0.70 and 1.2 mm.
  • the distance between the carding drum and the transfer cylinder is less than 1 mm, being preferably between 0.4 and 0.6 mm.
  • the lateral flanks of the teeth can be straight or curved.
  • the teeth are preferably pointed.
  • the transfer cylinder and its lining may be made of metal.
  • the card drum is made in the same way as the transfer cylinder by having teeth inclined at an angle identical to the inclination of the teeth of the transfer cylinder in the opposite direction.
  • the teeth are inclined in the direction of rotation.
  • the anisotropy of the nonwoven is further reduced by a suction cylinder adjacent to the upper strand of the second conveyor belt.
  • the installation generally includes, at the end, a consolidation device on the suction cylinder and or downstream from it.
  • the consolidation device may be by water jets or by hot air jets or by calender or by needling or be carried out in a hot air consolidation oven or the like.
  • FIG. 1 is a diagram of an installation according to the invention.
  • FIG. 1 is a view on a larger scale of the teeth of the lining of the transfer cylinder.
  • the installation of FIG. 1 comprises at least one card drum 1 driven by its own motor, a transfer cylinder 2 driven in rotation by its own motor, which totally discharges the drum 1 of the fibers on its surface.
  • one or two combers 3 and 4 driven by their own motor take the fibers from the surface of the transfer cylinder 2.
  • the condensers 5 and 6 and the detachers 7 and 8 driven by their own motor, then a transfer to a conveyor belt 9.
  • the installation then comprises a drum 10 aspirating condensation and transfer disposed between the conveyor 9 and a conveyor belt 11 entering an installation by consolidation by water jets.
  • the consolidation installation by water jets conforms to that described in European patent 1554421. It comprises a first cylinder 12 for consolidation by water jets tangent to the mat 11 and comprising a pre-wetting injector 13, disposed substantially at the transfer point between the mat 11 and the cylinder 12 and injectors 14 and 15 for consolidation.
  • This first consolidation cylinder 12 is optionally followed by other consolidation cylinders by water jets, to give better resistance to the nonwovens thus produced.
  • the distance between the drum 11 and the mat 9 and between the mat 11 and the cylinder 12 is between 2 and 15 mm.
  • the transfer cylinder 2 is equipped on its periphery with a metal gasket G.
  • This lining G is composed of a plurality of teeth 16.
  • the double arrow L represents the direction parallel to the longitudinal axis of the transfer cylinder 2, that is to say the direction orthogonal to the plane of Figure 1.
  • Figure 3 is a sectional view of the lining of the transfer cylinder 2 along a plane transverse to its longitudinal axis.
  • the teeth 16 of the lining G are aligned in the form of adjacent rows parallel to the longitudinal axis of the transfer cylinder 2. In Figure 2, only two adjacent rows of teeth 16 have been shown.
  • Each tooth 16 of the lining G is inclined relative to the radius of the transfer cylinder 2 at an angle A and is oriented in the direction of rotation of the cylinder 2 (circumferential speed).
  • the circumferential distance e between two points of neighboring teeth is equal to 1.80 mm.
  • the axial length H of a tooth is equal to 1.20 mm.
  • a tablecloth of about 60 g / m 2 composed of 50% polyester fibers of 1.7 dtex and 38 mm in length and 50% of viscose of 1.7 dtex and 40 mm in length is produced at a speed about 78 m / min at cylinder 12.
  • the card is a conventional card, without drum 2, and adjusted according to the optimum production settings in the production of nonwovens.
  • the speeds of each element are described in the table below.
  • the binding cylinder 12 is covered with a microperforated sleeve as described in French patent 2734285.
  • the sheet is first wetted by an injector 13 projecting jets of water 140 microns in diameter with a pressure of 10 bar, the jets being spaced from each other by 0.9 mm in two rows.
  • the sheet thus wetted and slightly consolidated is then subjected to the action of two successive hydraulic injectors 14 and 15 projecting water jets of 120 microns in diameter at increasing pressures of 70 bar and 90 bar, the jets being spaced apart others 1.4 mm in two rows.
  • the binding cylinder 12 is followed by another binding cylinder, not shown, and covered with the same microperforated sleeve as the cylinder 12 and equipped with an injector projecting, on the face opposite to the injectors 14 and 15, jets of water of 120 microns in diameter at a pressure of 100 bar.
  • the nonwoven thus obtained is then transferred to a suction mat connected to a vacuum generator, then dried at a temperature of 140 ° C in a through air oven.
  • a nonwoven weighing approximately 60 g / m 2 is obtained.
  • the nonwoven has a uniform appearance.
  • Example 1 The conditions of Example 1 are repeated with an installation according to the invention, which now comprises a cylinder 2, but by operating the installation at the speeds indicated in the table below.
  • a nonwoven weighing approximately 60 g / m 2 is obtained.
  • the nonwoven has a uniform appearance, but the MD / CD ratio is poor.
  • Example 2 The conditions of Example 2 are repeated. For this test, the speeds of the various elements are modified according to the table below. A nonwoven weighing approximately 60 g / m 2 is obtained. The nonwoven has a uniform appearance and a satisfactory MD / CD ratio.
  • Example 2 The conditions of Example 2 are repeated. For this test, the speeds of the various elements are modified according to the table below.
  • a nonwoven weighing approximately 60 g / m 2 is obtained.
  • the nonwoven has a uniform appearance and an even better MD / CD ratio than in Example 3.
  • Example 2 The conditions of Example 2 are repeated. For this test, the speeds of the various elements are modified according to the table below.
  • a nonwoven weighing approximately 60 g / m 2 is obtained.
  • the nonwoven has a uniform appearance and an even better MD / CD ratio than in Example 4.
  • Example 2 The conditions of Example 2 are repeated. For this test, the speeds of the various elements are modified according to the table below.
  • a nonwoven weighing approximately 60 g / m 2 is obtained.
  • the nonwoven has a uniform appearance of an MD / CD ratio of 1.2, quite remarkable and unexpected.
  • Example 1 is repeated with a conventional card without transfer cylinder, applying the speed ratios of Example 5 from the combers to cylinder 12.
  • the nonwoven produced has many folds in the transverse direction and is unusable or unsaleable.
  • MD means machine direction
  • CD means cross direction
  • the unit m / min is the unit of circumferential speed of the various components of the installation.

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

Abstract

Unit for producing non-wovens, comprising a card drum (1) rotated in a first direction of rotation, a transfer cylinder (2) rotated in a second direction of rotation opposite to the first direction of rotation, at least one doffer (3, 4), at least one condenser (5, 6), at least one stain receiver (7, 8), a first endless conveyor belt (9), a suction drum (10) and a second endless conveyor belt (10).

Description

INSTALLATION ET PROCÉDÉ DE PRODUCTION DE NON-TISSÉS INSTALLATION AND METHOD FOR PRODUCING NONWOVEN
La présente invention se rapporte à une installation et à un procédé de production de non-tissés par voie sèche. The present invention relates to an installation and a process for the production of nonwovens by the dry process.
Les installations de production de non-tissés par voie sèche comprennent généralement une section de formation d'un voile ou d'une nappe, qui comprend une ou deux cardes, suivie d'une section de consolidation par jets d'eau, généralement sur plusieurs cylindres rotatifs et convoyeurs successifs, puis une section d'extraction d'eau par vide poussé, le plus souvent, ensuite, une section de séchage et enfin un enroulement. Installations for the production of dry nonwovens generally include a section for forming a veil or a sheet, which comprises one or two cards, followed by a consolidation section by water jets, generally on several rotary cylinders and successive conveyors, then a water extraction section by high vacuum, most often, then, a drying section and finally a winding.
Ces installations par voie sèche ont l'avantage de produire des non-tissés légers, généralement de 20 à 80 g/m2 à des vitesses élevées de 150 à 350 m/minute. Les non-tissés produits sont de bonne qualité et sont produits de manière économique, mais ont une résistance à la traction en sens machine bien supérieure à la résistance à la traction en sens travers. Ceci provient du mode de formation des voiles par cardage direct. Les rapports de résistance sens machine/sens travers sont généralement supérieurs à 3/1 voire 4/1, c'est-à-dire que la résistance à la traction en sens machine est quatre fois supérieure à la résistance à la traction du même non-tissé en sens travers. Lorsque l'on veut produire des non-tissés ayant des propriétés de résistance très proches dans le sens machine et dans le sens travers, il est d'usage d' intercaler, entre la carde et le poste de consolidation, un étaleur-nappeur . 1/ étaleur-nappeur croise en couches superposées et en travers le voile de carde pour donner de la résistance à la traction en sens travers. Mais cette technique a principalement l'inconvénient d'être lente et d'être adaptée à des nappes lourdes, à tout le moins plus lourdes que le cardage direct. These dry installations have the advantage of producing light nonwovens, generally from 20 to 80 g / m 2 at high speeds of 150 to 350 m / minute. The nonwovens produced are of good quality and are produced economically, but have a tensile strength in the machine direction far superior to the tensile strength in the cross direction. This comes from the mode of formation of sails by direct carding. The machine direction / cross direction resistance ratios are generally greater than 3/1 or even 4/1, that is to say that the tensile strength in the machine direction is four times greater than the tensile strength of the same no. -woven in the cross direction. When it is desired to produce nonwovens having very similar strength properties in the machine direction and in the cross direction, it is customary to interpose, between the carding machine and the consolidation, a spreader-lapper. 1 / spreader-lapper crosses in superimposed layers and across the card web to give tensile strength in the cross direction. But this technique mainly has the disadvantage of being slow and of being suitable for heavy layers, at least heavier than direct carding.
Pour produire des nappes légères de 40 à 60 g/m2, par exemple avec une carde suivie d'un étaleur-nappeur, il est nécessaire de se limiter à un petit nombre de plis de 1 à 3 plis et d'étirer la nappe à la sortie de l' étaleur- nappeur avec des rouleaux étireurs. Ces deux facteurs, petit nombre de plis et utilisation d'un étireur, sont néfastes à l'homogénéité de la nappe et du non-tissé produit. De plus, et dans les meilleures conditions possibles de vitesse, la production de non-tissés légers avec étaleur-nappeur est limitée à environ 180 à 200 kg/h et par mètre de largeur de production et avec des fibres fines de titre compris entre 1,3 et 2,2 dtex. To produce light webs of 40 to 60 g / m 2 , for example with a card followed by a spreader-lapper, it is necessary to limit oneself to a small number of plies of 1 to 3 plies and to stretch the tablecloth at the exit of the spreader-lapper with stretching rollers. These two factors, the small number of folds and the use of a stretcher, are detrimental to the homogeneity of the web and of the nonwoven produced. In addition, and under the best possible conditions of speed, the production of light nonwovens with spreader-lapper is limited to approximately 180 to 200 kg / h and per meter of production width and with fine fibers of titer between 1 , 3 and 2.2 dtex.
On a trouvé, suivant l'invention, une installation qui permet de produire des non-tissés par voie sèche d'un poids surfacique même compris entre 40 et 80 g/m2 par cardage direct à des cadences élevées et avec des rapports de résistance en sens machine/sens travers de moins de 2,5/1, voire de moins de 2/1, voire de moins de 1,5/1 et très proches de 1,0 bien adaptés à des marchés qualitatifs, comme les lingettes professionnelles ou les masques cosmétiques, où l'on souhaite des non-tissés aussi légers que possible, pourvu que l'on règle comme il convient suivant l'invention les vitesses de rotation des éléments dont l'installation est constituée. La productivité est augmentée de 40 à 50% par rapport à une installation avec étaleur-nappeur et étireur de même largeur en production de non-tissés légers. De plus, l'invention ne nécessite qu'une carde et pas d'autres machines supplémentaires comme nappeur et étireur, nécessite bien moins d'investissement, met en œuvre bien moins d'éléments mécaniques en mouvement (rouleaux, tapis, par exemple) et consomme moins d'énergie par kilo de produit. According to the invention, an installation has been found which makes it possible to produce nonwovens by the dry route with an area weight even of between 40 and 80 g / m 2 by direct carding at high rates and with resistance ratios. in machine direction / cross direction of less than 2.5 / 1, even less than 2/1, even less than 1.5 / 1 and very close to 1.0 well suited to qualitative markets, such as professional wipes or cosmetic masks, where nonwovens are desired to be as light as possible, provided that the rotational speeds of the elements of which the installation is made are suitably adjusted. Productivity is increased by 40 to 50% compared to an installation with spreader-lapper and stretcher of the same width in the production of light nonwovens. In addition, the invention requires only a carding machine and not other additional machines such as lapper and stretcher, requires much less investment, implements much less moving mechanical elements (rollers, belts, for example) and consumes less energy per kilo of product.
L'installation de production de non-tissés par voie sèche suivant l'invention comprend un tambour de carde entraîné en rotation dans un premier sens de rotation et à une première vitesse circonférentielle de rotation par des premiers moyens d'entraînement, en donnant un voile de fibres. Elle est caractérisée en ce qu'elle comprend, immédiatement en aval du tambour dans le sens de passage des fibres de l'installation, un cylindre de transfert entraîné en rotation dans un second sens de rotation, contraire au premier sens de rotation, et à une deuxième vitesse circonférentielle de rotation par des deuxièmes moyens d'entraînement en rotation, la deuxième vitesse étant supérieure à la première vitesse, le cylindre de transfert ayant à la périphérie une garniture comprenant un pluralité de dents inclinées par rapport au rayon du cylindre et orientées dans le second sens de rotation, et immédiatement en aval du cylindre de transfert, un système comprenant, d'amont en aval en succession immédiatement, au moins un peigneur, au moins un condenseur, au moins un détacheur, un premier tapis convoyeur sans fin, un tambour aspirant et un deuxième tapis convoyeur sans fin, le tambour aspirant étant adjacent au brin supérieur des premier et deuxième tapis convoyeurs et assurant le passage des fibres de l'un à 1 ' autre . Par immédiatement en aval, on entend, dans le présent mémoire, soit que ce qui est immédiatement en aval est adjacent à ce qui est immédiatement en amont, soit au moins qu'il n'y a pas d'autres rouleaux ou tambours entre eux . The installation for producing dry nonwovens according to the invention comprises a card drum driven in rotation in a first direction of rotation and at a first circumferential speed of rotation by first drive means, giving a veil fiber. It is characterized in that it comprises, immediately downstream of the drum in the direction of passage of the fibers of the installation, a transfer cylinder driven in rotation in a second direction of rotation, contrary to the first direction of rotation, and at a second circumferential speed of rotation by second rotational drive means, the second speed being greater than the first speed, the transfer cylinder having at the periphery a lining comprising a plurality of teeth inclined relative to the radius of the cylinder and oriented in the second direction of rotation, and immediately downstream of the transfer cylinder, a system comprising, from upstream to downstream in succession immediately, at least one doffer, at least one condenser, at least one detacher, a first endless conveyor belt , a suction drum and a second endless conveyor belt, the suction drum being adjacent to the upper strand of the first and second conveyor belts and ensuring the pa ssage of fibers from one to another. By immediately downstream is meant in this specification either that which is immediately downstream is adjacent to what is immediately upstream, or at least that there are no other rollers or drums between them .
D'une manière inattendue, cette installation permet de se dispenser d'un étaleur-nappeur . Ce qui est particulièrement surprenant est que l'amélioration de l'isotropie du non-tissé se fait sentir non seulement immédiatement après le cylindre de transfert denté, mais au-delà de plus en plus tout le long de la ligne. Unexpectedly, this installation makes it possible to dispense with a spreader-lapper. What is particularly surprising is that the improvement in the isotropy of the nonwoven is felt not only immediately after the toothed transfer cylinder, but beyond more and more along the line.
Avec une installation dépourvue du cylindre de transfert et si on fait varier les rapports de vitesse suivant l'invention, notamment comme précisé au tableau suivant, on produit des plis et défauts d'aspect dans le non-tissé sans pour autant améliorer suffisamment le rapport de résistance sens machine/sens travers. With an installation devoid of the transfer cylinder and if the speed ratios according to the invention are varied, in particular as specified in the following table, folds and appearance defects are produced in the nonwoven fabric without, however, sufficiently improving the ratio resistance in machine direction / cross direction.
De préférence, le rapport de la deuxième vitesse à la première vitesse est supérieur ou égal à 1,6, et mieux encore supérieur ou égal à 1,7. Preferably, the ratio of the second speed to the first speed is greater than or equal to 1.6, and better still greater than or equal to 1.7.
Lorsque, de préférence, les rapports de vitesse de rotation des différents éléments de l'installation sont les suivants : When, preferably, the rotational speed ratios of the various elements of the installation are as follows:
Tableau 1 Table 1
L'invention vise également un procédé de production de non-tissés, dans lequel on fait fonctionner l'installation suivant l'invention suivant les rapports de vitesse suivant l'invention. The invention also relates to a process for producing nonwovens, in which the installation according to the invention is operated according to the speed ratios according to the invention.
On peut obtenir un produit non-tissé à base de fibres artificielles et/ou synthétiques, comme le viscose, le lyocell, le polyester ou le polypropylène, de masse au mètre carré comprise entre 40 et 80 g/m2 et dont les fibres ont un titre compris entre 1,3 et 2,2 dtex et ont une longueur comprise entre 30 et 50 mm, le rapport de la résistance à la traction sens machine/sens travers va de 1,0 à 1,5 et l'allongement en sens machine est compris entre 35 et 70% et, de préférence, entre 40 et 60% et l'allongement en sens travers est compris entre 70 et 130% et, de préférence, compris entre 90 et 125%. A nonwoven product based on artificial and / or synthetic fibers, such as viscose, lyocell, polyester or polypropylene, of mass per square meter of between 40 and 80 g / m 2 and whose fibers have a strength between 1.3 and 2.2 dtex and have a length between 30 and 50 mm, the ratio of the tensile strength machine direction / cross direction goes from 1.0 to 1.5 and the elongation in machine direction is between 35 and 70% and preferably between 40 and 60% and the elongation in the cross direction is between 70 and 130% and preferably between 90 and 125%.
Les mesures de résistance dans le sens long (MD) et dans le sens travers (CD) , et de masse au m2 sont conduites selon les normes ERT de l'EDANA (European Disposables And Nonwovens Association) à savoir : The resistance measurements in the long direction (MD) and in the cross direction (CD), and of mass per m 2 are carried out according to the ERT standards of EDANA (European Disposables And Nonwovens Association), namely:
a) Masse au mètre carré : a) Mass per square meter:
On conditionne un échantillon pendant 24 heures et on effectue l'essai à 23°C et à une humidité relative de 50%. A sample is conditioned for 24 hours and the test is carried out at 23 ° C and a relative humidity of 50%.
On coupe au moins 3 échantillons d'une surface d'au moins 50000 mm2 avec un appareil de découpe appelé massicot . At least 3 samples are cut with an area of at least 50,000 mm 2 with a cutting device called a cutter.
Chaque échantillon est pesé sur une balance de laboratoire ayant une précision de 0,1% de la masse des échantillons pesés. Each sample is weighed on a laboratory balance with an accuracy of 0.1% of the mass of the weighed samples.
b) Résistance et allongement dans le sens long et dans le sens travers : On conditionne un échantillon pendant 24 heures et on effectue l'essai à 23°C et à une humidité relative de 50%. On utilise pour le test un dynamomètre comprenant un jeu de mâchoires fixes et un jeu de mâchoires mobiles se déplaçant à une vitesse constante. Les mâchoires du dynamomètre ont une largeur utile de 50 mm. Le dynamomètre est équipé d'un enregistreur, qui permet de tracer la courbe de la force de traction en fonction de l'allongement. On coupe 5 échantillons de 50 mm, plus ou moins 0,5 mm de largeur et de 250 mm de longueur, ceci dans le sens long et dans le sens travers du non-tissé. Les échantillons sont testés un par un, à une vitesse constante de traction de 100 mm par minute et avec une distance initiale entre mâchoires de 200 mm. Le dynamomètre enregistre la courbe de la force de traction en newtons en fonction de l'allongement. b) Strength and elongation in the long direction and in the cross direction: A sample is conditioned for 24 hours and the test is carried out at 23 ° C and a relative humidity of 50%. A dynamometer is used for the test, comprising a set of fixed jaws and a set of movable jaws moving at a constant speed. The jaws of the dynamometer have a useful width of 50 mm. The dynamometer is equipped with a recorder, which plots the curve of the tensile force as a function of the elongation. 5 samples are cut of 50 mm, more or less 0.5 mm in width and 250 mm in length, this in the long direction and in the cross direction of the nonwoven. The samples are tested one by one, at a constant tensile speed of 100 mm per minute and with an initial distance between jaws of 200 mm. The dynamometer records the curve of the tensile force in Newtons as a function of the elongation.
L'invention a également pour objet un procédé de production du produit non-tissé ci-dessus, dans lequel on fait fonctionner l'installation suivant l'invention en donnant à ses divers éléments les vitesses de rotation permettant d'obtenir les rapports souhaités. The invention also relates to a process for producing the above nonwoven product, in which the installation according to the invention is operated by giving its various elements the rotational speeds making it possible to obtain the desired ratios.
Le diamètre du cylindre de transfert est, de préférence, inférieur à celui du tambour de carde. Le rapport est, par exemple, compris entre 0,40 et 0,50. Généralement, le tambour de carde a un diamètre compris entre 900 et 1500. The diameter of the transfer cylinder is preferably less than that of the card drum. The ratio is, for example, between 0.40 and 0.50. Generally, the card drum has a diameter between 900 and 1500.
L'angle d'inclinaison des dents avec le rayon peut être compris entre 70° et 80°. La hauteur radiale des dents est avantageusement comprise entre 0,7 et 1,5 mm. Les dents sont réparties uniformément sur toute la périphérie du cylindre de transfert, l'intervalle entre deux dents voisines étant compris entre 1,3 et 2,3 mm. La largeur des dents à leur base est comprise entre 0,70 et 1,2 mm. La distance entre le tambour de carde et le cylindre de transfert est inférieure à 1 mm, en étant, de préférence, comprise entre 0,4 et 0,6 mm. The angle of inclination of the teeth with the radius can be between 70 ° and 80 °. The radial height of the teeth is advantageously between 0.7 and 1.5 mm. The teeth are distributed uniformly over the entire periphery of the transfer cylinder, the interval between two teeth neighbors being between 1.3 and 2.3 mm. The width of the teeth at their base is between 0.70 and 1.2 mm. The distance between the carding drum and the transfer cylinder is less than 1 mm, being preferably between 0.4 and 0.6 mm.
Les flancs latéraux des dents peuvent être rectilignes ou incurvés . The lateral flanks of the teeth can be straight or curved.
Les dents sont, de préférence, pointues. The teeth are preferably pointed.
Le cylindre de transfert et sa garniture peuvent être en métal . The transfer cylinder and its lining may be made of metal.
Le tambour de carde est constitué de la même façon que le cylindre de transfert en ayant des dents inclinées d'un angle identique à l'inclinaison des dents du cylindre de transfert dans le sens contraire. The card drum is made in the same way as the transfer cylinder by having teeth inclined at an angle identical to the inclination of the teeth of the transfer cylinder in the opposite direction.
Les dents sont inclinées dans le sens de rotation. The teeth are inclined in the direction of rotation.
De préférence, on diminue encore l ' anisotropie du non- tissé par un cylindre aspirant adjacent au brin supérieur du deuxième tapis convoyeur. Preferably, the anisotropy of the nonwoven is further reduced by a suction cylinder adjacent to the upper strand of the second conveyor belt.
L'installation comprend, généralement à la fin, un dispositif de consolidation sur le cylindre aspirant et ou en aval de celui-ci. Le dispositif de consolidation peut être par jets d'eau ou par jets d'air chaud ou par calandre ou par aiguilletage ou s'effectuer dans un four de consolidation à air chaud ou autres. The installation generally includes, at the end, a consolidation device on the suction cylinder and or downstream from it. The consolidation device may be by water jets or by hot air jets or by calender or by needling or be carried out in a hot air consolidation oven or the like.
Au dessin annexé, donné uniquement à titre d'exemple :In the attached drawing, given solely by way of example:
- la figure 1 est un schéma d'une installation suivant l'invention, tandis que - Figure 1 is a diagram of an installation according to the invention, while
- les figures 2 et 3 sont des vues à plus grande échelle des dents de la garniture du cylindre de transfert. L'installation de la figure 1 comprend au moins un tambour 1 de carde entraîné par son propre moteur, un cylindre 2 de transfert entraîné en rotation par son propre moteur, qui décharge totalement le tambour 1 des fibres à sa surface. A la suite de ce cylindre 2 de transfert, un ou deux peigneurs 3 et 4 entraînés par leur propre moteur prélèvent les fibres à la surface du cylindre 2 de transfert. Il y a ensuite les condenseurs 5 et 6 et les détacheurs 7 et 8, entraînés par leur propre moteur, puis un transfert sur un tapis 9 convoyeur. L'installation comporte ensuite un tambour 10 aspirant de condensation et de transfert disposé entre le convoyeur 9 et un tapis 11 convoyeur d'entrée dans une installation de consolidation par jets d'eau. Avantageusement, l'installation de consolidation par jets d'eau est conforme à celle décrite dans le brevet européen 1554421. Elle comporte un premier cylindre 12 de consolidation par jets d'eau tangent au tapis 11 et comprenant un injecteur 13 de prémouillage, disposé sensiblement au point de transfert entre le tapis 11 et le cylindre 12 et des injecteurs 14 et 15 de consolidation. Ce premier cylindre 12 de consolidation est éventuellement suivi d'autres cylindres de consolidation par jets d'eau, pour conférer une meilleure résistance aux non-tissés ainsi produits. - Figures 2 and 3 are views on a larger scale of the teeth of the lining of the transfer cylinder. The installation of FIG. 1 comprises at least one card drum 1 driven by its own motor, a transfer cylinder 2 driven in rotation by its own motor, which totally discharges the drum 1 of the fibers on its surface. Following this transfer cylinder 2, one or two combers 3 and 4 driven by their own motor take the fibers from the surface of the transfer cylinder 2. Then there are the condensers 5 and 6 and the detachers 7 and 8, driven by their own motor, then a transfer to a conveyor belt 9. The installation then comprises a drum 10 aspirating condensation and transfer disposed between the conveyor 9 and a conveyor belt 11 entering an installation by consolidation by water jets. Advantageously, the consolidation installation by water jets conforms to that described in European patent 1554421. It comprises a first cylinder 12 for consolidation by water jets tangent to the mat 11 and comprising a pre-wetting injector 13, disposed substantially at the transfer point between the mat 11 and the cylinder 12 and injectors 14 and 15 for consolidation. This first consolidation cylinder 12 is optionally followed by other consolidation cylinders by water jets, to give better resistance to the nonwovens thus produced.
Les divers éléments tournants de l'installation sont entraînés par leur propre moteur qui sont schématisés à la figure 1 par les flèches qui indiquent les sens de rotation pour les deux d'entre eux les plus en aval dans le sens de partage du voile de carde. The various rotating elements of the installation are driven by their own motor which are shown diagrammatically in Figure 1 by the arrows which indicate the directions of rotation for the two of them furthest downstream in the direction of division of the card web .
La distance entre le tambour 11 et le tapis 9 et entre le tapis 11 et le cylindre 12 est comprise entre 2 et 15 mm. Aux figures 2 et 3, le cylindre 2 de transfert est équipé sur sa périphérie d'une garniture G métallique. Cette garniture G est composée d'une pluralité de dents 16. A la figure 2, la double flèche L représente la direction parallèle à l'axe longitudinal du cylindre 2 de transfert, c'est-à-dire la direction orthogonale au plan de la figure 1. La figure 3 est une vue en coupe de la garniture du cylindre 2 de transfert selon un plan transversal à son axe longitudinal. Les dents 16 de la garniture G sont alignées sous la forme de rangées adjacentes parallèles à l'axe longitudinal du cylindre 2 de transfert. A la figure 2, seules deux rangées adjacentes de dents 16 ont été représentées. Chaque dent 16 de la garniture G est inclinée par rapport au rayon du cylindre 2 de transfert selon un angle A et est orientée dans le sens de rotation du cylindre 2 (vitesse circonférentielle) . La distance e circonférentielle entre deux points de dents voisines est égale à 1,80 mm. La longueur H axiale d'une dent est égale à 1,20 mm. The distance between the drum 11 and the mat 9 and between the mat 11 and the cylinder 12 is between 2 and 15 mm. In FIGS. 2 and 3, the transfer cylinder 2 is equipped on its periphery with a metal gasket G. This lining G is composed of a plurality of teeth 16. In FIG. 2, the double arrow L represents the direction parallel to the longitudinal axis of the transfer cylinder 2, that is to say the direction orthogonal to the plane of Figure 1. Figure 3 is a sectional view of the lining of the transfer cylinder 2 along a plane transverse to its longitudinal axis. The teeth 16 of the lining G are aligned in the form of adjacent rows parallel to the longitudinal axis of the transfer cylinder 2. In Figure 2, only two adjacent rows of teeth 16 have been shown. Each tooth 16 of the lining G is inclined relative to the radius of the transfer cylinder 2 at an angle A and is oriented in the direction of rotation of the cylinder 2 (circumferential speed). The circumferential distance e between two points of neighboring teeth is equal to 1.80 mm. The axial length H of a tooth is equal to 1.20 mm.
Les exemples suivants illustrent l'invention. The following examples illustrate the invention.
Exemple 1 (comparatif) Example 1 (comparative)
Une nappe d'environ 60 g/m2 composée de 50% de fibres de polyester de 1,7 dtex et 38 mm de longueur et de 50% de viscose de 1,7 dtex et de 40 mm de longueur est produite à une vitesse d'environ 78 m/min au niveau du cylindre 12. A tablecloth of about 60 g / m 2 composed of 50% polyester fibers of 1.7 dtex and 38 mm in length and 50% of viscose of 1.7 dtex and 40 mm in length is produced at a speed about 78 m / min at cylinder 12.
Pour cet essai, la carde est une carde classique, sans tambour 2, et réglée selon les réglages de production optimums en production de non-tissés. Les vitesses de chaque élément sont décrites dans le tableau ci-après. For this test, the card is a conventional card, without drum 2, and adjusted according to the optimum production settings in the production of nonwovens. The speeds of each element are described in the table below.
Le cylindre de liage 12 est recouvert d'un manchon microperforé tel que décrit dans le brevet français 2734285. La nappe est d'abord mouillée par un injecteur 13 projetant des jets d'eau de 140 microns de diamètre avec une pression de 10 bar, les jets étant espacés les uns des autres de 0,9 mm sur deux rangées. La nappe ainsi mouillée et légèrement consolidée est alors soumise à l'action de deux injecteurs hydrauliques successifs 14 et 15 projetant des jets d'eau de 120 microns de diamètre à des pressions croissantes de 70 bar et 90 bar, les jets étant espacés les uns des autres de 1,4 mm sur deux rangées . The binding cylinder 12 is covered with a microperforated sleeve as described in French patent 2734285. The sheet is first wetted by an injector 13 projecting jets of water 140 microns in diameter with a pressure of 10 bar, the jets being spaced from each other by 0.9 mm in two rows. The sheet thus wetted and slightly consolidated is then subjected to the action of two successive hydraulic injectors 14 and 15 projecting water jets of 120 microns in diameter at increasing pressures of 70 bar and 90 bar, the jets being spaced apart others 1.4 mm in two rows.
Le cylindre de liage 12 est suivi d'un autre cylindre de liage, non représenté, et recouvert du même manchon microperforé que le cylindre 12 et équipé d'un injecteur projetant, sur la face opposée aux injecteurs 14 et 15, des jets d'eau de 120 microns de diamètre à une pression de 100 bar. The binding cylinder 12 is followed by another binding cylinder, not shown, and covered with the same microperforated sleeve as the cylinder 12 and equipped with an injector projecting, on the face opposite to the injectors 14 and 15, jets of water of 120 microns in diameter at a pressure of 100 bar.
Le non-tissé ainsi obtenu est ensuite transféré sur un tapis aspirant connecté à un générateur de vide, puis séché à une température de 140°C dans un four à air traversant . The nonwoven thus obtained is then transferred to a suction mat connected to a vacuum generator, then dried at a temperature of 140 ° C in a through air oven.
On obtient un non-tissé pesant environ 60 g/m2. Le non- tissé a un aspect uniforme. A nonwoven weighing approximately 60 g / m 2 is obtained. The nonwoven has a uniform appearance.
Exemple 2 (comparatif) Example 2 (comparative)
On répète les conditions de l'exemple 1 avec une installation selon l'invention, qui comprend maintenant un cylindre 2, mais en faisant fonctionner l'installation aux vitesses indiquées dans le tableau ci-après. The conditions of Example 1 are repeated with an installation according to the invention, which now comprises a cylinder 2, but by operating the installation at the speeds indicated in the table below.
On obtient un non-tissé pesant environ 60 g/m2. Le non- tissé a un aspect uniforme, mais le rapport MD/CD est médiocre . A nonwoven weighing approximately 60 g / m 2 is obtained. The nonwoven has a uniform appearance, but the MD / CD ratio is poor.
Exemple 3 Example 3
On répète les conditions de l'exemple 2. Pour cet essai, les vitesses des différents éléments sont modifiées selon le tableau ci-après. On obtient un non-tissé pesant environ 60 g/m2. Le non- tissé a un aspect uniforme et un rapport MD/CD satisfaisant . The conditions of Example 2 are repeated. For this test, the speeds of the various elements are modified according to the table below. A nonwoven weighing approximately 60 g / m 2 is obtained. The nonwoven has a uniform appearance and a satisfactory MD / CD ratio.
Exemple 4 Example 4
On répète les conditions de l'exemple 2. Pour cet essai, les vitesses des différents éléments sont modifiées selon le tableau ci-après. The conditions of Example 2 are repeated. For this test, the speeds of the various elements are modified according to the table below.
On obtient un non-tissé pesant environ 60 g/m2. Le non- tissé a un aspect uniforme et un rapport MD/CD encore meilleur que dans l'exemple 3. A nonwoven weighing approximately 60 g / m 2 is obtained. The nonwoven has a uniform appearance and an even better MD / CD ratio than in Example 3.
Exemple 5 Example 5
On répète les conditions de l'exemple 2. Pour cet essai, les vitesses des différents éléments sont modifiées selon le tableau ci-après. The conditions of Example 2 are repeated. For this test, the speeds of the various elements are modified according to the table below.
On obtient un non-tissé pesant environ 60 g/m2. Le non- tissé a un aspect uniforme et un rapport MD/CD encore meilleur que dans l'exemple 4. A nonwoven weighing approximately 60 g / m 2 is obtained. The nonwoven has a uniform appearance and an even better MD / CD ratio than in Example 4.
Exemple 6 Example 6
On répète les conditions de l'exemple 2. Pour cet essai, les vitesses des différents éléments sont modifiées selon le tableau ci-après. The conditions of Example 2 are repeated. For this test, the speeds of the various elements are modified according to the table below.
On obtient un non-tissé pesant environ 60 g/m2. Le non- tissé a un aspect uniforme d'un rapport MD/CD de 1,2, tout à fait remarquable et inattendu. A nonwoven weighing approximately 60 g / m 2 is obtained. The nonwoven has a uniform appearance of an MD / CD ratio of 1.2, quite remarkable and unexpected.
Exemple 7 (comparatif) Example 7 (comparative)
On répète l'exemple 1 avec une carde classique dépourvue de cylindre de transfert, en appliquant les rapports de vitesse de l'exemple 5 des peigneurs jusqu'au cylindre 12. Le non-tissé produit a de nombreux plis en sens transversal et est inutilisable ou invendable. Tableau 2 Example 1 is repeated with a conventional card without transfer cylinder, applying the speed ratios of Example 5 from the combers to cylinder 12. The nonwoven produced has many folds in the transverse direction and is unusable or unsaleable. Table 2
MD signifie sens machine, CD signifie sens travers. MD means machine direction, CD means cross direction.
L'unité m/min est l'unité de vitesse circonférentielle des divers éléments constitutifs de l'installation. The unit m / min is the unit of circumferential speed of the various components of the installation.
5 5

Claims

REVENDICATIONS
1. Installation de production de non-tissés par voie sèche comprenant : 1. Installation for the production of dry nonwovens comprising:
un tambour (1) de carde entraîné en rotation dans un premier sens de rotation et à une première vitesse circonférentielle de rotation par des premiers moyens d'entraînement en donnant un voile de fibres, a card drum (1) driven in rotation in a first direction of rotation and at a first circumferential speed of rotation by first drive means giving a web of fibers,
caractérisée en ce qu'elle comprend, immédiatement en aval du tambour (1), dans le sens de passage des fibres de l'installation, un cylindre (2) de transfert entraîné en rotation dans un second sens de rotation contraire au premier sens de rotation et à une deuxième vitesse circonférentielle de rotation par des deuxièmes moyens d'entraînement en rotation, la deuxième vitesse étant supérieure à la première vitesse, le cylindre (2) de transfert ayant à la périphérie une garniture (G) comprenant une pluralité de dents (16) inclinées par rapport au rayon du cylindre (2) et orientées dans le second sens de rotation, et immédiatement en aval du cylindre (2) de transfert, un système comprenant, d'amont en aval en succession immédiatement, au moins un peigneur (3, 4), au moins un condenseur (5, 6), au moins un détacheur characterized in that it comprises, immediately downstream of the drum (1), in the direction of passage of the fibers of the installation, a transfer cylinder (2) driven in rotation in a second direction of rotation opposite to the first direction of rotation and at a second circumferential speed of rotation by second rotational drive means, the second speed being greater than the first speed, the transfer cylinder (2) having at the periphery a gasket (G) comprising a plurality of teeth (16) inclined relative to the radius of the cylinder (2) and oriented in the second direction of rotation, and immediately downstream of the transfer cylinder (2), a system comprising, from upstream to downstream in succession immediately, at least one comber (3, 4), at least one condenser (5, 6), at least one detacher
(7, 8), un premier tapis (9) convoyeur sans fin, un tambour (10) aspirant et un deuxième tapis (11) convoyeur sans fin, le tambour (10) aspirant étant adjacent au brin supérieur des premier et deuxième tapis (9, 11) convoyeurs et assurant le passage des fibres de l'un à l'autre. (7, 8), a first endless conveyor belt (9), a suction drum (10) and a second endless conveyor belt (11), the suction drum (10) being adjacent to the upper strand of the first and second conveyor belts (9, 11) and ensuring the passage of the fibers from one to the other.
2. Installation suivant la revendication 1, caractérisée en ce que le rapport de la deuxième vitesse à la première vitesse est supérieur ou égal à 1,2 et, de préférence, supérieur ou égal à 1,3. 2. Installation according to claim 1, characterized in that the ratio of the second speed to the first speed is greater than or equal to 1.2 and, preferably, greater than or equal to 1.3.
3. Installation suivant la revendication 1 ou 2, caractérisée en ce que le diamètre du cylindre (2) de transfert est inférieur à celui du tambour (1) de carde . 3. Installation according to claim 1 or 2, characterized in that the diameter of the transfer cylinder (2) is less than that of the carding drum (1).
4. Installation suivant la revendication 1 ou 2, caractérisée en ce que l'angle d'inclinaison des dents avec le rayon est compris entre 70° et 80° et la hauteur radiale des dents est comprise entre 0,7 et 1,5 mm. 4. Installation according to claim 1 or 2, characterized in that the angle of inclination of the teeth with the radius is between 70 ° and 80 ° and the radial height of the teeth is between 0.7 and 1.5 mm .
5. Installation suivant l'une des revendications précédentes, caractérisée par un cylindre (12) aspirant adjacent au brin supérieur du deuxième tapis (11) convoyeur. 6. Installation suivant l'une des revendications précédentes, caractérisée en ce que le rapport de la vitesse circonférentielle du peigneur (3, 4) à celle du cylindre (2) est compris entre 0,10 et 0,20, en ce que le rapport de la vitesse circonférentielle du condenseur (5, 6) à celle du peigneur (3, 4) est compris entre 0,35 et 0,55, en ce que le rapport de la vitesse circonférentielle du détacheur (7, 8) à celle du condenseur (5, 6) est compris entre 1,50 et5. Installation according to one of the preceding claims, characterized by a suction cylinder (12) adjacent to the upper strand of the second conveyor belt (11). 6. Installation according to one of the preceding claims, characterized in that the ratio of the circumferential speed of the doffer (3, 4) to that of the cylinder (2) is between 0.10 and 0.20, in that the ratio of the circumferential speed of the condenser (5, 6) to that of the doffer (3, 4) is between 0.35 and 0.55, in that the ratio of the circumferential speed of the detacher (7, 8) to that condenser (5, 6) is between 1.50 and
1,75, en ce que le rapport de la vitesse du tapis (9) convoyeur à celle du condenseur (5, 1.75, in that the speed ratio of the belt (9) conveyor to that of the condenser (5,
6) est compris entre 0,95 et 1,10, en ce que le rapport de la vitesse circonférentielle du tambour (10) à la vitesse du premier tapis (9) convoyeur est compris entre 0,70 et 0,90 et en ce que le rapport de la vitesse du deuxième tapis (11) convoyeur à la vitesse circonférentielle du tambour (10) est compris entre 0,70 et 0,90. 6) is between 0.95 and 1.10, in that the ratio of the circumferential speed of the drum (10) to the speed of the first conveyor belt (9) is between 0.70 and 0.90 and that the ratio of the speed of the second conveyor belt (11) to the circumferential speed of the drum (10) is between 0.70 and 0.90.
7. Installation suivant la revendication 5, caractérisée en ce que le rapport de la vitesse circonférentielle du cylindre (12) à celle du deuxième tapis (11) convoyeur est compris entre 0,75 et 1,05. 7. Installation according to claim 5, characterized in that the ratio of the circumferential speed of the cylinder (12) to that of the second conveyor belt (11) is between 0.75 and 1.05.
8. Produit non-tissé à base de fibres artificielles et/ou synthétique, ayant une masse au m 2 comprise entre 45 et 80g/m2 et dont les fibres ont un titre compris entre 1,3 et 2,2 dtex et une longueur comprise entre 30 et 50 mm, un rapport de la résistance dans le sens machine à la résistance dans le sens travers allant de 1,0 à 1,5, un allongement dans le sens machine compris entre 35 et 70% et, de préférence, entre 40 et 60% et un allongement dans le sens travers compris entre 70 et 130% et, de préférence, compris entre 90 et 125%. 8. Nonwoven product based on artificial and / or synthetic fibers, having a mass per m 2 of between 45 and 80 g / m 2 and whose fibers have a titer of between 1.3 and 2.2 dtex and a length between 30 and 50 mm, a ratio of the resistance in the machine direction to the resistance in the cross direction ranging from 1.0 to 1.5, an elongation in the machine direction between 35 and 70% and, preferably, between 40 and 60% and an elongation in the cross direction between 70 and 130% and, preferably, between 90 and 125%.
9. Produit non-tissé suivant la revendication précédente, caractérisé en ce que les fibres sont en viscose, en lyocell, en polyester ou en polypropylène . 9. Nonwoven product according to the preceding claim, characterized in that the fibers are viscose, lyocell, polyester or polypropylene.
10. Procédé de production de non-tissés par voie sèche dans une installation suivant la revendication 1, caractérisé en ce que l'on fait fonctionner l'installation avec les rapports de vitesse suivants : 10. A method of producing nonwovens by the dry route in an installation according to claim 1, characterized in that one operates installation with the following speed ratios:
- le rapport de la vitesse circonférentielle du peigneur (3, 4) à celle du cylindre (2) est compris entre 0,10 et 0,20 ; - The ratio of the circumferential speed of the doffer (3, 4) to that of the cylinder (2) is between 0.10 and 0.20;
- le rapport de la vitesse circonférentielle du condenseur (5, 6) à celle du peigneur (3, 4) est compris entre 0,35 et 0,55 ; - The ratio of the circumferential speed of the condenser (5, 6) to that of the doffer (3, 4) is between 0.35 and 0.55;
- le rapport de la vitesse circonférentielle du détacheur (7, 8) à celle du condenseur (5, 6) est compris entre 1,50 et 1,75 ; - The ratio of the circumferential speed of the detacher (7, 8) to that of the condenser (5, 6) is between 1.50 and 1.75;
- le rapport de la vitesse du tapis (9) convoyeur à celle du condenseur (5, 6) est compris entre 0,95 et 1,10 ; - The ratio of the speed of the conveyor belt (9) to that of the condenser (5, 6) is between 0.95 and 1.10;
- le rapport de la vitesse circonférentielle du tambour (10) à la vitesse du premier tapis (9) convoyeur est compris entre 0,70 et 0,90 ; et - The ratio of the circumferential speed of the drum (10) to the speed of the first conveyor belt (9) is between 0.70 and 0.90; and
- le rapport de la vitesse du deuxième tapis (11) convoyeur à la vitesse circonférentielle du tambour (10) est compris entre 0,70 et 0,90. - The ratio of the speed of the second conveyor belt (11) to the circumferential speed of the drum (10) is between 0.70 and 0.90.
11. Procédé suivant la revendication 10, caractérisé en ce que le rapport de la vitesse circonférentielle du cylindre (12) à celle du deuxième tapis (11) convoyeur est compris entre 0,75 et 1,05. 11. Method according to claim 10, characterized in that the ratio of the circumferential speed of the cylinder (12) to that of the second conveyor belt (11) is between 0.75 and 1.05.
EP19828809.4A 2019-01-08 2019-12-31 Unit and method for producing non-wovens Active EP3908687B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1900150A FR3091541B1 (en) 2019-01-08 2019-01-08 Nonwoven production facility
PCT/EP2019/087194 WO2020144084A1 (en) 2019-01-08 2019-12-31 Unit and method for producing non-wovens

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Publication Number Publication Date
EP3908687A1 true EP3908687A1 (en) 2021-11-17
EP3908687B1 EP3908687B1 (en) 2023-05-31

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CN (1) CN113508198A (en)
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DE202022106415U1 (en) * 2022-11-15 2024-02-16 Autefa Solutions Germany Gmbh Fiber treatment plant

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EP3908687B1 (en) 2023-05-31
ES2953571T3 (en) 2023-11-14
US11987916B2 (en) 2024-05-21
US20220056624A1 (en) 2022-02-24
CN113508198A (en) 2021-10-15
WO2020144084A1 (en) 2020-07-16

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