EP1244834A1 - Method and installation for producing a multidirectional textile web - Google Patents

Method and installation for producing a multidirectional textile web

Info

Publication number
EP1244834A1
EP1244834A1 EP00974650A EP00974650A EP1244834A1 EP 1244834 A1 EP1244834 A1 EP 1244834A1 EP 00974650 A EP00974650 A EP 00974650A EP 00974650 A EP00974650 A EP 00974650A EP 1244834 A1 EP1244834 A1 EP 1244834A1
Authority
EP
European Patent Office
Prior art keywords
unidirectional
support strip
fibers
sheet
ply
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Withdrawn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
EP00974650A
Other languages
German (de)
French (fr)
Inventor
Gérard HALLART
Alain Regad
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.)
Rhovyl SA
Original Assignee
Rhovyl SA
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 Rhovyl SA filed Critical Rhovyl SA
Publication of EP1244834A1 publication Critical patent/EP1244834A1/en
Withdrawn legal-status Critical Current

Links

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
    • D04H3/002—Inorganic yarns or filaments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H37/00—Article or web delivery apparatus incorporating devices for performing specified auxiliary operations
    • B65H37/002—Web delivery apparatus, the web serving as support for articles, material or another web
    • 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
    • D04H3/009—Condensation or reaction polymers
    • 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
    • D04H3/04—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 in rectilinear paths, e.g. crossing at right angles
    • 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
    • D04H3/12—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 filaments or yarns secured together by chemical or thermo-activatable bonding agents, e.g. adhesives, applied or incorporated in liquid or solid form
    • 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
    • D04H3/14—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
    • D04H3/147—Composite yarns or filaments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/41—Winding, unwinding
    • B65H2301/415—Unwinding

Definitions

  • the present invention relates to a method and an installation for producing a multidirectional fibrous web.
  • multidirectional fibrous plies formed by the superposition of several unidirectional fibrous plies arranged in different directions and interconnected.
  • Each unidirectional sheet is formed of fibers which are oriented in a direction and generally along the longitudinal axis of said sheet.
  • This type of ply is obtained for example by cracking, carding, converting or drawing with or without a bar of at least one cable, for example of carbon.
  • a commonly used technique consists in giving the fibers sufficient cohesion in order to avoid their dispersion.
  • One of the means for giving this cohesion to the fibers of the unidirectional sheet consists in binding them together by threads arranged in a weft or by sewing.
  • the main drawback of these techniques lies in the fact that the bonding wires create extra thicknesses forming corrugations which can lead to the crushing and breaking of the fibers of the unidirectional sheets during the superposition and pressing of these sheets against each other. .
  • the breaking of the fibers can result in a degradation of the multidirectional layers and consequently harm the mechanical properties of the parts in composite material obtained from these multidirectional layers.
  • binding wires made of hot-melt material which at least partially melt during the production of the composite material, which makes it possible to reduce the excess thicknesses.
  • the material making up the bonding yarns be compatible with the nature of the matrix of the composite material, which limits the use of this technique.
  • Another technique also: employed consists in giving cohesion to the fibers of the unidirectional sheet by a slight intermingling of these fibers by the application on this sheet of a jet of water or by needling.
  • the application of a jet of water or needles can cause local disorganization of the fibers of the unidirectional sheet by creating holes which can adversely affect the mechanical properties of the parts made of composite material.
  • Another solution consists in giving cohesion to the fibers of the unidirectional sheet by the addition of a chemical bonding agent which may be eliminated, for example by spraying a liquid composition onto the sheet or passing through a bath.
  • a chemical bonding agent which may be eliminated, for example by spraying a liquid composition onto the sheet or passing through a bath.
  • such a technique increases the cost price of the unidirectional sheet.
  • the object of the invention is to avoid these drawbacks by proposing a method and an installation for producing a multidirectional fibrous web from unidirectional fibrous webs which can be handled before they are superimposed and which have good surface regularity.
  • the subject of the invention is therefore a process for producing a multidirectional fibrous web, in which several unidirectional fibrous webs are superimposed in different directions and said unidirectional webs are connected together, characterized in that:
  • the fibers of this ply are maintained on the support strip, the unidirectional ply is separated from the support strip,
  • the fibers of said unidirectional ply are maintained on the support strip by suction through said strip,
  • the fibers of the unidirectional sheet are made from a material chosen from carbon, glass, ceramics, aramids, silicon carbide or mineral fibers, or hot-melt fibers or fusible fibers or any mixture of these fibers,
  • the support strip is made of a textile material made from a material chosen from polyethylene, polyamide, polyester, polypropylene or viscose.
  • the subject of the invention is also an installation for producing a multidirectional fibrous web produced by superimposing unidirectional fibrous webs in different directions and linked together, characterized in that it comprises:
  • a subject of the invention is also a unidirectional fibrous web, characterized in that it is formed of staple fibers which are independent of each other obtained from at least one cable to make at least one multidirectional web.
  • FIG. 1 is a schematic view in side elevation of a first embodiment of an installation for producing a unidirectional fibrous web
  • FIG. 2 and 3 are two schematic views in side elevation of a second embodiment of an installation for producing a unidirectional fibrous web
  • Fig. 4 is a schematic perspective view of a support strip for the unidirectional fibrous web.
  • Figs. 1 to 3 there is shown diagrammatically two embodiments of an installation for producing a unidirectional fibrous sheet intended to form a multidirectional sheet by superposition and bonding of several unidirectional sheets of which at least one is composed of staple fibers and independent of each other.
  • the unidirectional fibrous web designated by the reference 1, is obtained in the examples of realization sation shown in the figures, by cracking at least one cable.
  • the unidirectional fibrous web can be obtained by other methods such as, for example, carding, converting or drawing with or without a bar.
  • the fibers of the unidirectional sheet are made from a material chosen from carbon, glass, ceramics, aramids, silicon carbide or mineral fibers or thermo-usable fibers or fusible fibers or any mixture of these fibers.
  • the installation according to the invention makes it possible to produce unidirectional fibrous sheets composed of staple fibers and independent of each other, without device for binding these fibers and therefore without the creation of defects which can adversely affect the mechanical properties of parts made of composite material made from these unidirectional fibrous layers.
  • the installation comprises a cracking unit for example designated as a whole by the reference 10, at the outlet of which is formed the unidirectional fibrous sheet 1 composed of staple fibers and independent of each other.
  • the installation also comprises a coil 11 carrying a continuous and porous strip designated by the reference 12 and which is progressively unwound below the unidirectional ply 1 so as to form a continuous support strip for the fibers of said unidirectional ply 1 for transporting and handling this sheet.
  • the installation also includes rollers 14 for guiding the assembly formed by the support strip 12 and the unidirectional ply 1, means 15 for driving this assembly in translation by exerting traction on the support strip 12 and means 20 for holding the fibers of the uniform ply 1 on the support strip 12 during transport.
  • the rollers 14 are mounted free in translation and guide the assembly formed by the support strip 12 and the unidirectional ply 1 to the station for separating this unidirectional ply 1 from said support strip 12 where the unidirectional plies 1 are superimposed in different directions so as to form a multidirectional sheet, not shown, which is used for the production of composite parts.
  • the fibers of the unidirectional ply 1 are held on the support strip 12 by the means 20 which are formed by a suction system 21 disposed on the path of said unidirectional ply 1 and below of the support strip 12.
  • the support strip 12 is made of a porous material such as for example a textile material.
  • the means 20 for holding the fibers of the unidirectional ply 1 on the support strip 12 can be constituted by any other system such as for example a blowing system disposed above the ply 1 or also by free rotating rollers also arranged above the ply 1 and which press the fibers of this ply on the support strip 12.
  • the installation also comprises means 25 for winding the support strip 12 so as to form a coil 11 which allows the transport and reuse of this support strip 12.
  • the means 25 for winding the support strip 12 are constituted by a cylinder 26 for winding said strip 12 mounted free in rotation and vertically movable.
  • each end of the axis 27 of the cylinder 26 is mounted in a slide 28 in such a way that the cylinder 26 rises progressively during the winding of the support strip 12 on said cylinder 26.
  • the means 15 for driving the support strip 12 act on the external face of said support strip 12 during its winding on the cylinder 26 so as to exert traction only on this support strip 12 without modifying the homogeneity of the fibers of the unidirectional ply 1 during its transfer between the cracking unit 10 and the station for producing the multidirectional ply.
  • the drive means of the assembly formed by the unidirectional ply 1 and the support strip 12 comprise an endless strip 16 forming a loop and comprising at each of its ends a roller 17.
  • One of the rollers is motorized so as to drive this endless belt 16 in translation at a speed substantially equal to the speed of advance of the unidirectional sheet at the outlet of the cracking unit 10.
  • This endless strip 16 is in contact with the external face of the support strip 12 which makes it possible to exert on this support strip 12 sufficient traction to move the assembly formed by the unidirectional ply 1 and said strip support 12.
  • the drive means are formed by at least one horizontal roller, preferably by a train of rollers of which at least one is driven in rotation at a speed substantially equal to the speed of advance of the unidirectional ply after training. These rollers are in contact with the external face of the support strip 12.
  • the drive roller can be provided at each of its ends with pins cooperating with the edges of the support strip 12.
  • the installation is divided into two parts, a first part shown in FIG. 2 and a second part shown in FIG. 3.
  • the first part shown in FIG. 2 comprises a cracking unit 10 for obtaining, from at least one cable, a unidirectional sheet 1 composed of discontinuous and independent fibers from each other and means for unwinding a reel 11 of a continuous strip and porous to form a support for the fibers of the unidirectional sheet 1.
  • This first part also comprises means 20 for holding the fibers of the unidirectional sheet 1 on the support strip 12 during its transport and which are constituted by a suction system 21 arranged below the support strip 12.
  • the first part of the installation comprises means 30 for winding the assembly formed by the unidirectional sheet 1 and the support strip 12 so as to produce a coil 31 which can be stored and transferred in the second part of the installation for producing a multidirectional fibrous web from said unidirectional web 1.
  • the support strip 12 makes it possible to protect the fibers of this ply and to maintain the consistency of said unidirectional ply 1.
  • the means 30 for winding the assembly formed by the unidirectional ply 1 and the support strip 12 are constituted by a cylinder 32 for winding said assembly mounted free in rotation and displaceable vertically and by drive means 35 acting on the external face of the support strip 12 during its winding so as to exert traction only on said support strip 12.
  • each end of the axis 33 of the winding cylinder 32 is mounted in a slide 34 which allows said cylinder 32 to move upward as the turns are wound around this cylinder 32 .
  • the drive means 35 are formed by an endless band 36 forming a loop provided at each of its ends with a guide roller 37. 5
  • One of the rollers 37 is motorized so as to drive the band in translation endless 36 at a speed substantially equal to the speed of the unidirectional sheet after its formation.
  • This endless strip 36 is in contact with the C external face of the support strip 12 so as to exert on this support strip 12 a traction enabling the reel 31 to be formed.
  • the drive means are formed by at least one horizontal roller and preferably by a train of rollers of which at least one is driven in rotation at a speed substantially equal to the speed of advance of the web. unidirectional 1 after its formation.
  • rollers are in contact with the external face of the support strip 12 which makes it possible to print at 0 this support strip 12 a traction to allow the winding of the assembly comprising the unidirectional ply 1 and the support strip 12 .
  • the motorized roller can be provided at each of its ends with pins cooperating with the edges of the support strip 12.
  • the coil 31 thus produced is transferred to the second part of the installation, shown in FIG. 3.
  • This second part of the installation comprises 0 means 40 for unwinding the coil 31 and means 50 for winding the support strip 12 to allow its reuse in the first part of the installation.
  • the means 40 for unwinding the reel 31 are formed by a support constituted by two slides 41 each intended to receive one end of the axis 33 of the winding cylinder 32.
  • the coil 31 is mounted to rotate freely in the slides 41 and is displaceable vertically by means of a support member 45 which cooperates with the external face of the support strip 12.
  • the support member 45 is formed by an endless band 46 which forms a loop provided at each of its ends with a guide roller 47 free to rotate.
  • the endless belt 46 is free in translation and has the role of supporting the reel 31 during its unwinding.
  • the installation comprises a suction system 21 which makes it possible to hold the fibers of the unidirectional sheet 1 on the support strip 12 up to the station for producing the multidirectional sheet from of said unidirectional sheet 1.
  • the support member 45 of the coil 31 can be formed by at least one horizontal and free-rotating roller which is in contact with the external face of the support strip 12.
  • the means 50 for winding the support strip tl2 are formed by a winding cylinder 51 comprising an axis 52, each end of which is mounted for free rotation in a slide 53.
  • the cylinder 51 is displaced vertically as the support strip 12 is wound up.
  • the winding means 50 also comprise drive means 55 acting on the external face of the support strip 12 during its winding.
  • the drive means 55 consist of an endless belt 56 which forms a loop comprising at each of its ends a guide roller 57.
  • rollers 57 is rotated which allows to exercise, via the band without at the end of 55, a pull only on the support strip 12 and to move, by means of the support strip 12, the fibers of the unidirectional ply of the coil 31 to the station for producing the multidirectional ply.
  • the drive means 55 can be formed by at least one horizontal roller and preferably by a train of rollers of which at least one is driven in rotation. These rollers are in contact with the external face of the support strip 12 and one of the rollers can be provided at each of its ends with pins cooperating with the edges of the support strip 12.
  • the installation can also include, at the outlet of the unit for forming the unidirectional sheet 1, means for spraying a surfactant or water making it possible to increase the cohesion of the unidirectional sheet 1.
  • the support strip 12 is advantageously made of a porous material to allow the suction of the fibers of the unidirectional ply 1 through said support strip and this porous material is preferably a textile made from a material chosen from polyethylene , polyamide, polyester, polypropylene or viscose. As shown in FIG. 4, the support strip 12 has, on each of its edges, a continuous bead 12a and has a width slightly greater than the width of the unidirectional ply 1.
  • This support strip 12 must reconcile several characteristics which are finesse, lightness, resistance, porosity to facilitate suction and must also have a slight surface roughness.
  • the fineness and lightness as well as the resistance are linked and depend on the title of the thread and the material used.
  • the titles are between 20/1 and 200/2, in 1 or 2 ends, in continuous or spun yarn. fibers. Textiles are obtained between 20 and 200 g / m 2 for a thickness of the order of 1/10 mm.
  • the minimum resistance is, for example, of the order of 30cN / tex and the support strip 12 has, for example, square pores whose dimensions are between 2/10 mm and 7/10 mm.
  • This support strip prevents tangling between the turns during winding and unwinding and also allows the unidirectional sheet to be moved, avoiding any traction on the fibers of this sheet so as to save them a force which can disorganize the homogeneity of the fibers of the unidirectional tablecloth.
  • the unidirectional tablecloth thus obtained which is composed of staple fibers and independent of each other is used to form a multidirectional tablecloth by superimposing several unidirectional tablecloths and connecting them together, for example by sewing, by knitting, by needling or by gluing .
  • the porous strip can be used for transporting and / or storing at least one multidirectional sheet made up of several unidirectional sheets superimposed and not connected to each other.
  • the unidirectional sheet can be made from several cables of the same kind or of different natures.
  • the multidirectional sheet can be obtained by superimposing unidirectional sheets of the same kind or of different natures in different directions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

The invention concerns a method for producing a multidirectional textile web and the installation therefor, wherein several unidirectional textile webs (1) are superimposed along different directions and in assembling together said unidirectional textile webs. The method consists in forming, from at least one tow, at least one of said unidirectional textile webs consisting of discontinuous fibres independent of one another, in applying said unidirectional web on a continuous and porous support conveyor belt (12), in driving in translation the assembly formed by the support belt (12) and the unidirectional web (1) exerting traction on said support belt, in maintaining the fibres of said web on the support belt (12), in separating the unidirectional web (1) from the support belt (12) and in superimposing said unidirectional web (1) with at least another unidirectional web.

Description

Procédé et installation d'élaboration d'une nappe fibreuse multidirectionnelle. Method and installation for developing a multidirectional fibrous web.
La présente invention concerne un procédé et une installation d'élaboration d'une nappe fibreuse multidirectionnelle .The present invention relates to a method and an installation for producing a multidirectional fibrous web.
Pour l'élaboration de pièces composites, il est connu d'utiliser des nappes fibreuses multidirectionnelles formées par la superposition de plusieurs nappes fibreuses unidirectionnelles disposées selon des directions différentes et reliées entre elles .For the production of composite parts, it is known to use multidirectional fibrous plies formed by the superposition of several unidirectional fibrous plies arranged in different directions and interconnected.
Chaque nappe unidirectionnelle est formée de fi- bres qui sont orientées selon une direction et généralement selon l'axe longitudinal de ladite nappe.Each unidirectional sheet is formed of fibers which are oriented in a direction and generally along the longitudinal axis of said sheet.
Ce type de nappe est obtenu par exemple par cra- quage , cardage, convertissage ou étirage avec ou sans ba- rette d'au moins un câble par exemple de carbone. Mais, la manipulation de ce genre de nappe fibreuse unidirectionnelle pose des problèmes et une technique couramment utilisée consiste à donner aux fibres suffisamment de cohésion afin d'éviter leur dispersion.This type of ply is obtained for example by cracking, carding, converting or drawing with or without a bar of at least one cable, for example of carbon. However, the handling of this kind of unidirectional fibrous sheet poses problems and a commonly used technique consists in giving the fibers sufficient cohesion in order to avoid their dispersion.
Un des moyens pour donner cette cohésion aux fibres de la nappe unidirectionnelle consiste à les lier entre elles par des fils disposés en trame ou par couture.One of the means for giving this cohesion to the fibers of the unidirectional sheet consists in binding them together by threads arranged in a weft or by sewing.
Le principal inconvénient de ces techniques réside dans le fait que les fils de liaison créent des surépaisseurs formant des ondulations qui peuvent entraîner l'écrasement et la rupture des fibres des nappes unidirectionnelles lors de la superposition et du pressage de ces nappes les unes contre les autres.The main drawback of these techniques lies in the fact that the bonding wires create extra thicknesses forming corrugations which can lead to the crushing and breaking of the fibers of the unidirectional sheets during the superposition and pressing of these sheets against each other. .
La rupture des fibres peut se traduire par une dégradation des nappes multidirectionnelles et par consé- quent nuire aux propriétés mécaniques des pièces en matériau composite obtenues à partir de ces nappes multidirectionnelles .The breaking of the fibers can result in a degradation of the multidirectional layers and consequently harm the mechanical properties of the parts in composite material obtained from these multidirectional layers.
Pour éviter cet inconvénient, il est aussi connu d'utiliser des fils de liage en matériau thermofusible qui fondent au moins partiellement au cours de l'élaboration du matériau composite ce qui permet de diminuer les surépaisseurs . Mais, il est nécessaire dans ce cas que le matériau composant des fils de liage so t compatible avec la nature de la matrice du matériau composite, ce qui limite l'emploi de cette technique. Une autre technique également: employée consiste à donner une cohésion aux fibres de la nappe unidirectionnelle par un léger entremêlement de ces fibres par l'application sur cette nappe d'un jet d'eau ou par aiguilletage . Mais, l'application d'un jet d'eau ou des aiguilles peut en- traîner une désorganisation locale des fibres de la nappe unidirectionnelle en créant des trous qui peuvent nuire aux propriétés mécaniques des pièces en matériau composite.To avoid this drawback, it is also known to use binding wires made of hot-melt material which at least partially melt during the production of the composite material, which makes it possible to reduce the excess thicknesses. However, it is necessary in this case that the material making up the bonding yarns be compatible with the nature of the matrix of the composite material, which limits the use of this technique. Another technique also: employed consists in giving cohesion to the fibers of the unidirectional sheet by a slight intermingling of these fibers by the application on this sheet of a jet of water or by needling. However, the application of a jet of water or needles can cause local disorganization of the fibers of the unidirectional sheet by creating holes which can adversely affect the mechanical properties of the parts made of composite material.
Une autre solution consiste à donner une cohésion aux fibres de la nappe unidirectionnelle par 1 ' apport d'un agent chimique de liaison éventuellement eliminable par exemple par projection d'une composition liquide sur la nappe ou passage dans un bain. Mais, une telle technique augmente le prix de revient de la nappe unidirectionnelle.Another solution consists in giving cohesion to the fibers of the unidirectional sheet by the addition of a chemical bonding agent which may be eliminated, for example by spraying a liquid composition onto the sheet or passing through a bath. However, such a technique increases the cost price of the unidirectional sheet.
L'invention a pour but d'éviter ces inconvé- nients en proposant un procédé et une installation d'élaboration d'une nappe fibreuse multidirectionnelle à partir de nappes fibreuses unidirectionnelles qui sont manipulables préalablement à leur superposition et qui présentent une bonne régularité de surface . L'invention a donc pour objet un procédé d'élaboration d'une nappe fibreuse multidirectionnelle, dans lequel on superpose plusieurs nappes fibreuses unidirectionnelles selon des directions différentes et on relie lesdites nappes unidirectionnelles entre elles, caractérisé en ce que :The object of the invention is to avoid these drawbacks by proposing a method and an installation for producing a multidirectional fibrous web from unidirectional fibrous webs which can be handled before they are superimposed and which have good surface regularity. . The subject of the invention is therefore a process for producing a multidirectional fibrous web, in which several unidirectional fibrous webs are superimposed in different directions and said unidirectional webs are connected together, characterized in that:
- on forme, à partir d'au moins un câble, au moins une desdites nappes unidirectionnelles composée de fibres discontinues et indépendantes les unes des autres,- at least one of said unidirectional plies composed of staple fibers independent of each other is formed from at least one cable,
- on applique ladite nappe unidirectionnelle sur une bande de support continue et poreuse, on entraîne en translation 1 ' ensemble formé par la bande de support et la nappe unidirectionnelle en exerçant une traction sur cette bande de support et à une vitesse sensiblement égale à la vitesse d'avance de cette nappe unidirectionnelle,- Said unidirectional ply is applied to a continuous and porous support strip, the assembly formed by the support strip and the unidirectional ply is brought into translation exerting traction on this support strip and at a speed substantially equal to the speed of advance of this unidirectional sheet,
- on maintient les fibres de cette nappe sur la bande de support , on sépare la nappe unidirectionnelle de la bande de support ,the fibers of this ply are maintained on the support strip, the unidirectional ply is separated from the support strip,
- et on superpose ladite nappe unidirectionnelle avec au moins une autre nappe unidirectionnelle. Selon d'autres caractéristiques de l'invention:- And superimposing said unidirectional sheet with at least one other unidirectional sheet. According to other characteristics of the invention:
- on maintient les fibres de ladite nappe unidirectionnelle sur la bande de support par aspiration à travers ladite bande,the fibers of said unidirectional ply are maintained on the support strip by suction through said strip,
- les fibres de la nappe unidirectionnelle sont en une matière choisie parmi le carbone, le verre, des céramiques, des aramides, le carbure de silicium ou des fibres minérales, ou des fibres thermofusibles ou des fibres thermocollantes ou tout mélange de ces fibres,the fibers of the unidirectional sheet are made from a material chosen from carbon, glass, ceramics, aramids, silicon carbide or mineral fibers, or hot-melt fibers or fusible fibers or any mixture of these fibers,
- la bande de support est en un matériau textile réalisé à partir d'une matière choisie parmi le polyéthy- lène, le polyamide, le polyester, le polypropylène ou la viscose .- The support strip is made of a textile material made from a material chosen from polyethylene, polyamide, polyester, polypropylene or viscose.
L'invention a également pour objet une installation d'élaboration d'une nappe fibreuse multidirectionnelle réalisée par superposition de nappes fibreuses unidirectionnelles selon des directions différentes et reliées entre elles, caractérisée en ce qu'elle comprend :The subject of the invention is also an installation for producing a multidirectional fibrous web produced by superimposing unidirectional fibrous webs in different directions and linked together, characterized in that it comprises:
- des moyens de formation, à partir d'au moins un câble, d'au moins une desdites nappes unidirectionnelle composée de fibres discontinues et indépendantes les unes des autres,means for forming, from at least one cable, at least one of said unidirectional plies composed of staple fibers which are independent of each other,
- des moyens de déroulement d'une bande continue et poreuse, de support des fibres de ladite nappe unidirectionnelle , - des moyens d'entraînement en translation de l'ensemble formé par la bande de support et la nappe unidirectionnelle en exerçant une traction sur cette bande de support et à une vitesse sensiblement égale à la vitesse d'avance de cette nappe après sa formation,- means for unwinding a continuous and porous strip, for supporting the fibers of said unidirectional ply, - means for driving in translation the assembly formed by the support strip and the unidirectional ply by exerting traction on this Band support and at a speed substantially equal to the speed of advance of this sheet after its formation,
- des moyens de maintien des fibres de la nappe unidirectionnelle sur la bande de support au cours de son transport,means for holding the fibers of the unidirectional ply on the support strip during its transport,
- des moyens de séparation de la nappe unidirectionnelle de la bande de support,means for separating the unidirectional ply from the support strip,
- et des moyens de superposition de ladite nappe unidirectionnelle avec au moins une autre nappe unidirec- tionnelie .- And means for superimposing said unidirectional ply with at least one other unidirectional ply.
L'invention a aussi pour objet une nappe fibreuse unidirectionnelle, caractérisée en ce qu'elle est formée de fibres discontinues et indépendantes les unes des autres obtenues à partir d'au moins un câble pour confec- tionner au moins une nappe multidirectionnelle.A subject of the invention is also a unidirectional fibrous web, characterized in that it is formed of staple fibers which are independent of each other obtained from at least one cable to make at least one multidirectional web.
L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée à titre d'exemple et faite en se référant aux dessins annexés, sur lesquels :The invention will be better understood on reading the description which follows, given by way of example and made with reference to the appended drawings, in which:
- la Fig. 1 est une vue schématique en éleva- tion latérale d'un premier mode de réalisation d'une installation d'élaboration d'une nappe fibreuse unidirectionnelle,- Fig. 1 is a schematic view in side elevation of a first embodiment of an installation for producing a unidirectional fibrous web,
- les Figs . 2 et 3 sont deux vues schématiques en élévation latérale d'un second mode de réalisation d'une installation d'élaboration d'une nappe fibreuse unidirec- tionnelie,- Figs. 2 and 3 are two schematic views in side elevation of a second embodiment of an installation for producing a unidirectional fibrous web,
- la Fig. 4 est une vue schématique en perspective d'une bande de support de la nappe fibreuse unidirectionnelle .- Fig. 4 is a schematic perspective view of a support strip for the unidirectional fibrous web.
Sur les Figs. 1 à 3, on a représenté schémati- quement deux modes de réalisation d'une installation d'élaboration d'une nappe fibreuse unidirectionnelle destinée à former une nappe multidirectionnelle par superposition et liage de plusieurs nappes unidirectionnelles dont au moins une est composée de fibres discontinues et indépendantes les unes des autres.In Figs. 1 to 3, there is shown diagrammatically two embodiments of an installation for producing a unidirectional fibrous sheet intended to form a multidirectional sheet by superposition and bonding of several unidirectional sheets of which at least one is composed of staple fibers and independent of each other.
La nappe fibreuse unidirectionnelle, désignée par la référence 1, est obtenue dans les exemples de réali- sation représentés sur les figures, par craquage d'au moins un câble .The unidirectional fibrous web, designated by the reference 1, is obtained in the examples of realization sation shown in the figures, by cracking at least one cable.
La nappe fibreuse unidirectionnelle peut être obtenue par d'autres procédés comme par exemple le cardage, le convertissage ou l'étirage avec ou sans barette .The unidirectional fibrous web can be obtained by other methods such as, for example, carding, converting or drawing with or without a bar.
A titre d'exemple, les fibres de la nappe unidirectionnelle sont en une matière choisie parmi le carbone, le verre, les céramiques, des aramides, le carbure de silicium ou des fibres minérales ou des fibres thermo usibles ou des fibres thermocollantes ou tout mélange de ces fibres.By way of example, the fibers of the unidirectional sheet are made from a material chosen from carbon, glass, ceramics, aramids, silicon carbide or mineral fibers or thermo-usable fibers or fusible fibers or any mixture of these fibers.
L'installation selon l'invention permet de réaliser des nappes fibreuses unidirectionnelles composées de fibres discontinues et indépendantes les unes des autres, sans dispositif de liage de ces fibres et par conséquent sans la création de défauts pouvant nuire aux propriétés mécaniques des pièces en matériau composite élaborées à partir de ces nappes fibreuses unidirectionnelles .The installation according to the invention makes it possible to produce unidirectional fibrous sheets composed of staple fibers and independent of each other, without device for binding these fibers and therefore without the creation of defects which can adversely affect the mechanical properties of parts made of composite material made from these unidirectional fibrous layers.
Selon un premier mode de réalisation représenté à la Fig. 1, l'installation comporte une unité par exemple de craquage désignée dans son ensemble par la référence 10, à la sortie de laquelle est formée la nappe fibreuse unidirectionnelle 1 composée de fibres discontinues et indépendantes les unes des autres .According to a first embodiment shown in FIG. 1, the installation comprises a cracking unit for example designated as a whole by the reference 10, at the outlet of which is formed the unidirectional fibrous sheet 1 composed of staple fibers and independent of each other.
L'installation comporte également une bobine 11 porteuse d'une bande continue et poreuse désignée par la référence 12 et qui est progressivement déroulée au-dessous de la nappe unidirectionnelle 1 de façon à former une bande continue de support pour les fibres de ladite nappe unidirectionnelle 1 pour le transport et la manipulation de cette nappe .The installation also comprises a coil 11 carrying a continuous and porous strip designated by the reference 12 and which is progressively unwound below the unidirectional ply 1 so as to form a continuous support strip for the fibers of said unidirectional ply 1 for transporting and handling this sheet.
Ainsi que représenté à la Fig. 1, l'installation comporte également des galets 14 de guidage de 1 ' nsemble formé par la bande de support 12 et la nappe unidirectionnelle 1, des moyens 15 d'entraînement en translation de cet ensemble en exerçant une traction sur la bande de support 12 et des moyens 20 de maintien des fibres de la nappe unidi- rectionnelle 1 sur la bande de support 12 au cours de son transport .As shown in FIG. 1, the installation also includes rollers 14 for guiding the assembly formed by the support strip 12 and the unidirectional ply 1, means 15 for driving this assembly in translation by exerting traction on the support strip 12 and means 20 for holding the fibers of the uniform ply 1 on the support strip 12 during transport.
Les galets 14 sont montés libres en translation et assurent le guidage de 1 ' ensemble formé par la bande de support 12 et la nappe unidirectionnelle 1 jusqu'au poste de séparation de cette nappe unidirectionnelle 1 de ladite bande de support 12 où les nappes unidirectionnelles 1 sont superposées selon des directions différentes de façon à former une nappe multidirectionnelle, non représentée, qui est utilisée pour l'élaboration de pièces composites.The rollers 14 are mounted free in translation and guide the assembly formed by the support strip 12 and the unidirectional ply 1 to the station for separating this unidirectional ply 1 from said support strip 12 where the unidirectional plies 1 are superimposed in different directions so as to form a multidirectional sheet, not shown, which is used for the production of composite parts.
Au cours de son transport, les fibres de la nappe unidirectionnelle 1 sont maintenues sur la bande de support 12 par les moyens 20 qui sont formés par un système d'aspiration 21 disposé sur le trajet de ladite nappe unidi- rectionnelle 1 et au-dessous de la bande de support 12.During its transport, the fibers of the unidirectional ply 1 are held on the support strip 12 by the means 20 which are formed by a suction system 21 disposed on the path of said unidirectional ply 1 and below of the support strip 12.
A cet effet, la bande de support 12 est réalisée en un matériau poreux comme par exemple un matériau textile. Les moyens 20 de maintien des fibres de la nappe unidirectionnelle 1 sur la bande de support 12 peuvent être constitués par tout autre système comme par exemple un système de soufflage disposé au-dessus de la nappe 1 ou encore par des rouleaux libres en rotation disposés également au dessus de la nappe 1 et qui plaquent les fibres de cette nappe sur la bande de support 12. Comme représenté à la Fig. 1, l'installation comporte également des moyens 25 de bobinage de la bande de support 12 de façon à former une bobine il ce qui permet le transport et la réutilisation de cette bande de support 12.To this end, the support strip 12 is made of a porous material such as for example a textile material. The means 20 for holding the fibers of the unidirectional ply 1 on the support strip 12 can be constituted by any other system such as for example a blowing system disposed above the ply 1 or also by free rotating rollers also arranged above the ply 1 and which press the fibers of this ply on the support strip 12. As shown in FIG. 1, the installation also comprises means 25 for winding the support strip 12 so as to form a coil 11 which allows the transport and reuse of this support strip 12.
Les moyens 25 de bobinage de la bande de support 12 sont constitués par un cylindre 26 d'enroulement de ladite bande 12 montée libre en rotation et déplaçable verticalement .The means 25 for winding the support strip 12 are constituted by a cylinder 26 for winding said strip 12 mounted free in rotation and vertically movable.
A cet effet, chaque extrémité de l'axe 27 du cylindre 26 est montée dans une glissière 28 de telle manière que le cylindre 26 monte progressivement au cours de l'enroulement de la bande de support 12 sur ledit cylindre 26. Pour cela, les moyens 15 d'entraînement de la bande de support 12 agissent sur la face externe de ladite bande de support 12 au cours de son enroulement sur le cylindre 26 de façon à exercer une traction uniquement sur cette bande de support 12 sans modifier l'homogénéité des fibres de la nappe unidirectionnelle 1 au cours de son transfert entre l'unité de craquage 10 et le poste d'élaboration de la nappe multidirectionnelle.To this end, each end of the axis 27 of the cylinder 26 is mounted in a slide 28 in such a way that the cylinder 26 rises progressively during the winding of the support strip 12 on said cylinder 26. For this, the means 15 for driving the support strip 12 act on the external face of said support strip 12 during its winding on the cylinder 26 so as to exert traction only on this support strip 12 without modifying the homogeneity of the fibers of the unidirectional ply 1 during its transfer between the cracking unit 10 and the station for producing the multidirectional ply.
Selon un mode de réalisation représenté à la Fig. 1, les moyens d'entraînement de l'ensemble formé par la nappe unidirectionnelle 1 et la bande de support 12 comprennent une bande sans fin 16 formant une boucle et comportant à chacune de ses extrémités un galet 17. L'un des galets est motorisé de façon à entraîner en translation cette bande sans fin 16 à une vitesse sensiblement égale à la vitesse d'avance de la nappe unidirectionnelle à la sortie de l'unité de craquage 10.According to an embodiment shown in FIG. 1, the drive means of the assembly formed by the unidirectional ply 1 and the support strip 12 comprise an endless strip 16 forming a loop and comprising at each of its ends a roller 17. One of the rollers is motorized so as to drive this endless belt 16 in translation at a speed substantially equal to the speed of advance of the unidirectional sheet at the outlet of the cracking unit 10.
Cette bande sans fin 16 est en contact avec la face externe de la bande de support 12 ce qui permet d'exer- cer sur cette bande de support 12 une traction suffisante pour déplacer 1 ' ensemble formé par la nappe unidirectionnelle 1 et la dite bande de support 12.This endless strip 16 is in contact with the external face of the support strip 12 which makes it possible to exert on this support strip 12 sufficient traction to move the assembly formed by the unidirectional ply 1 and said strip support 12.
Selon une variante, les moyens d'entraînement sont formés par au moins un rouleau horizontal, de préfé- rence par un train de rouleaux dont au moins un est entraîné en rotation à une vitesse sensiblement égale à la vitesse d'avance de la nappe unidirectionnelle après sa formation. Ces rouleaux sont en contact avec la face externe de la bande de support 12. Le rouleau d'entraînement peut être muni à chacune de ses extrémités de picots coopérant avec les lisières de la bande de support 12.According to a variant, the drive means are formed by at least one horizontal roller, preferably by a train of rollers of which at least one is driven in rotation at a speed substantially equal to the speed of advance of the unidirectional ply after training. These rollers are in contact with the external face of the support strip 12. The drive roller can be provided at each of its ends with pins cooperating with the edges of the support strip 12.
Selon un autre mode de réalisation, l'installation est divisée en deux parties, une première partie repré- sentée à la Fig. 2 et une seconde partie représentée à la Fig. 3. Comme pour le précédent mode de réalisation, la première partie représentée à la Fig. 2 comprend une unité de craquage 10 pour obtenir, à partir d'au moins un câble, une nappe unidirectionnelle 1 composée de fibres disconti- nues et indépendantes les unes des autres et des moyens de déroulement d'une bobine 11 d'une bande continue et poreuse pour former un support des fibres de la nappe unidirectionnelle 1.According to another embodiment, the installation is divided into two parts, a first part shown in FIG. 2 and a second part shown in FIG. 3. As for the previous embodiment, the first part shown in FIG. 2 comprises a cracking unit 10 for obtaining, from at least one cable, a unidirectional sheet 1 composed of discontinuous and independent fibers from each other and means for unwinding a reel 11 of a continuous strip and porous to form a support for the fibers of the unidirectional sheet 1.
Cette première partie comporte aussi des moyens 20 de maintien des fibres de la nappe unidirectionnelle 1 sur la bande de support 12 au cours de son transport et qui sont constitués par un système d'aspiration 21 disposé au- dessous de la bande de support 12.This first part also comprises means 20 for holding the fibers of the unidirectional sheet 1 on the support strip 12 during its transport and which are constituted by a suction system 21 arranged below the support strip 12.
Enfin, la première partie de l'installation com- porte des moyens 30 de bobinage de l'ensemble formé par la nappe unidirectionnelle 1 et la bande de support 12 de façon à réaliser une bobine 31 qui peut être stockée et transférée dans la seconde partie de l'installation pour réaliser une nappe fibreuse multidirectionnelle à partir de ladite nappe unidirectionnelle 1.Finally, the first part of the installation comprises means 30 for winding the assembly formed by the unidirectional sheet 1 and the support strip 12 so as to produce a coil 31 which can be stored and transferred in the second part of the installation for producing a multidirectional fibrous web from said unidirectional web 1.
La bande de support 12 permet de protéger les fibres de cette nappe et de conserver la cohérence de ladite nappe unidirectionnelle 1.The support strip 12 makes it possible to protect the fibers of this ply and to maintain the consistency of said unidirectional ply 1.
Ainsi que représenté à la Fig. 2, les moyens 30 de bobinage de l'ensemble formé par la nappe unidirectionnelle 1 et la bande de support 12 sont constitués par un cylindre 32 d'enroulement dudit ensemble monté libre en rotation et déplaçabie verticalement et par des moyens 35 d'entraînement agissant sur la face externe de la bande de sup- port 12 au cours de son enroulement de façon a exercer une traction uniquement sur ladite bande de support 12.As shown in FIG. 2, the means 30 for winding the assembly formed by the unidirectional ply 1 and the support strip 12 are constituted by a cylinder 32 for winding said assembly mounted free in rotation and displaceable vertically and by drive means 35 acting on the external face of the support strip 12 during its winding so as to exert traction only on said support strip 12.
Pour cela, chaque extrémité de l'axe 33 du cylindre d'enroulement 32 est monté dans une glissière 34 ce qui permet audit cylindre 32 de se déplacer vers le haut au fur et à mesure que les spires s'enroulent autour de ce cylindre 32. Dans l'exemple de réalisation représenté à la Fig. 2, les moyens d'entraînement 35 sont formés par une bande sans fin 36 formant une boucle munie à chacune de ses extrémités d'un galet de guidage 37. 5 L'un des galets 37 est motorisé de façon à entraîner en translation la bande sans fin 36 à une vitesse sensiblement égale à la vitesse de la nappe unidirectionnelle après sa formation.For this, each end of the axis 33 of the winding cylinder 32 is mounted in a slide 34 which allows said cylinder 32 to move upward as the turns are wound around this cylinder 32 . In the exemplary embodiment shown in FIG. 2, the drive means 35 are formed by an endless band 36 forming a loop provided at each of its ends with a guide roller 37. 5 One of the rollers 37 is motorized so as to drive the band in translation endless 36 at a speed substantially equal to the speed of the unidirectional sheet after its formation.
Cette bande sans fin 36 est en contact avec la C face externe de la bande de support 12 de manière à exercer sur cette bande de support 12 une traction permettant de former la bobine 31.This endless strip 36 is in contact with the C external face of the support strip 12 so as to exert on this support strip 12 a traction enabling the reel 31 to be formed.
Selon une variante, les moyens d'entraînement sont formés par au moins un rouleau horizontal et de préfé- 5 rence par un train de rouleaux dont au moins un est entraîné en rotation à une vitesse sensiblement égale à la vitesse d'avance de la nappe unidirectionnelle 1 après sa formation.According to a variant, the drive means are formed by at least one horizontal roller and preferably by a train of rollers of which at least one is driven in rotation at a speed substantially equal to the speed of advance of the web. unidirectional 1 after its formation.
Les rouleaux sont en contact avec la face externe de la bande de support 12 ce qui permet d'imprimer à 0 cette bande de support 12 une traction pour permettre l'enroulement de l'ensemble comprenant la nappe unidirectionnelle 1 et la bande de support 12.The rollers are in contact with the external face of the support strip 12 which makes it possible to print at 0 this support strip 12 a traction to allow the winding of the assembly comprising the unidirectional ply 1 and the support strip 12 .
Le rouleau motorisé peut être muni à chacune de ses extrémités de picots coopérant avec les lisières de la 5 bande de support 12.The motorized roller can be provided at each of its ends with pins cooperating with the edges of the support strip 12.
La bobine 31 ainsi réalisée est transférée dans la seconde partie de l'installation, représentée à la Fig. 3.The coil 31 thus produced is transferred to the second part of the installation, shown in FIG. 3.
Cette seconde partie de l'installation comporte 0 des moyens 40 de dévidage de la bobine 31 et des moyens 50 de bobinage de la bande de support 12 pour permettre sa réutilisation dans la première partie de l'installation.This second part of the installation comprises 0 means 40 for unwinding the coil 31 and means 50 for winding the support strip 12 to allow its reuse in the first part of the installation.
Les moyens 40 de dévidage de la bobine 31 sont formés par un support constitué de deux glissières 41 desti- 5 nées à recevoir chacune une extrémité de l'axe 33 du cylindre d'enroulement 32. Ainsi, la bobine 31 est montée libre en rotation dans les glissières 41 et est déplaçabie verticalement au moyen d'un organe d'appui 45 qui coopère avec la face externe de la bande de support 12. Selon le mode de réalisation représenté à laThe means 40 for unwinding the reel 31 are formed by a support constituted by two slides 41 each intended to receive one end of the axis 33 of the winding cylinder 32. Thus, the coil 31 is mounted to rotate freely in the slides 41 and is displaceable vertically by means of a support member 45 which cooperates with the external face of the support strip 12. According to the embodiment shown in the
Fig. 3, l'organe d'appui 45 est formé par une bande sans fin 46 qui forme une boucle munie à chacune de ses extrémités d'un galet de guidage 47 libre en rotation.Fig. 3, the support member 45 is formed by an endless band 46 which forms a loop provided at each of its ends with a guide roller 47 free to rotate.
De ce fait, la bande sans fin 46 est libre en translation et a pour rôle de supporter la bobine 31 au cours de son dévidage .Therefore, the endless belt 46 is free in translation and has the role of supporting the reel 31 during its unwinding.
A la sortie de la bande sans fin 46, l'installation comporte un système 21 d'aspiration qui permet de maintenir les fibres de la nappe unidirectionnelle 1 sur la bande de support 12 jusqu'au poste d'élaboration de la nappe multidirectionnelle à partir de ladite nappe unidirectionnelle 1.At the outlet of the endless strip 46, the installation comprises a suction system 21 which makes it possible to hold the fibers of the unidirectional sheet 1 on the support strip 12 up to the station for producing the multidirectional sheet from of said unidirectional sheet 1.
Selon une variante, l'organe d'appui 45 de la bobine 31 peut être formé par au moins un rouleau horizontal et libre en rotation qui est en contact avec la face externe de la bande de support 12.According to a variant, the support member 45 of the coil 31 can be formed by at least one horizontal and free-rotating roller which is in contact with the external face of the support strip 12.
Les moyens 50 de bobinage de la bande de support tl2 sont formés par un cylindre d'enroulement 51 comportant un axe 52 dont chaque extrémité est montée libre en rotation dans une glissière 53.The means 50 for winding the support strip tl2 are formed by a winding cylinder 51 comprising an axis 52, each end of which is mounted for free rotation in a slide 53.
Ainsi, le cylindre 51 est déplaçabie verticalement au fur et à mesure de l'enroulement de la bande de support 12.Thus, the cylinder 51 is displaced vertically as the support strip 12 is wound up.
Les moyens 50 de bobinage comportent également des moyens d'entraînement 55 agissant sur la face externe de la bande de support 12 au cours de son enroulement .The winding means 50 also comprise drive means 55 acting on the external face of the support strip 12 during its winding.
Selon un premier mode de réalisation, les moyens 55 d'entraînement sont constitués par une bande sans fin 56 qui forme une boucle comportant à chacune de ses extrémités un galet de guidage 57.According to a first embodiment, the drive means 55 consist of an endless belt 56 which forms a loop comprising at each of its ends a guide roller 57.
L'un des galets 57 est entraîné en rotation ce qui permet d'exercer, par l'intermédiaire de la bande sans fin 55, une traction uniquement sur la bande de support 12 et de déplacer par 1 ' intermédiaire de la bande de support 12, les fibres de la nappe unidirectionnelle de la bobine 31 jusqu'au poste d'élaboration de la nappe multidirection- nelle .One of the rollers 57 is rotated which allows to exercise, via the band without at the end of 55, a pull only on the support strip 12 and to move, by means of the support strip 12, the fibers of the unidirectional ply of the coil 31 to the station for producing the multidirectional ply.
Selon une variante, les moyens 55 d'entraînement peuvent être formés par au moins un rouleau horizontal et de préférence par un train de rouleaux dont au moins un est entraîné en rotation. Ces rouleaux sont en contact avec la face externe de la bande de support 12 et l'un des rouleaux peut être muni à chacune de ses extrémités de picots coopérant avec les lisières de la bande de support 12.According to a variant, the drive means 55 can be formed by at least one horizontal roller and preferably by a train of rollers of which at least one is driven in rotation. These rollers are in contact with the external face of the support strip 12 and one of the rollers can be provided at each of its ends with pins cooperating with the edges of the support strip 12.
L'installation peut également comporter, à la sortie de l'unité de formation de la nappe unidirectionnelle 1, des moyens de pulvérisation d'un agent tensioactif ou de l'eau permettant d'augmenter la cohésion de la nappe unidirectionnelle 1.The installation can also include, at the outlet of the unit for forming the unidirectional sheet 1, means for spraying a surfactant or water making it possible to increase the cohesion of the unidirectional sheet 1.
La bande de support 12 est avantageusement réalisée en un matériau poreux pour permettre l'aspiration des fibres de la nappe unidirectionnelle 1 à travers ladite bande de support et ce matériau poreux est de préférence un textile réalisé à partir d'une matière choisie parmi le polyéthylène, le polyamide, le polyester, le polypropylène ou la viscose. Ainsi que représenté à la Fig. 4, la bande de support 12 comporte, sur chacune de ses lisières, un bourrelet continu 12a et présente une largeur légèrement supérieure à la largeur de la nappe unidirectionnelle 1.The support strip 12 is advantageously made of a porous material to allow the suction of the fibers of the unidirectional ply 1 through said support strip and this porous material is preferably a textile made from a material chosen from polyethylene , polyamide, polyester, polypropylene or viscose. As shown in FIG. 4, the support strip 12 has, on each of its edges, a continuous bead 12a and has a width slightly greater than the width of the unidirectional ply 1.
Cette bande de support 12 doit concilier plu- sieurs caractéristiques qui sont la finesse, la légèreté, la résistance, la porosité pour faciliter l'aspiration et doit également présenter une légère rugosité de surface.This support strip 12 must reconcile several characteristics which are finesse, lightness, resistance, porosity to facilitate suction and must also have a slight surface roughness.
La finesse et la légèreté ainsi que la résistance sont liées et dépendent du titre du fil et de la ma- tière utilisée.The fineness and lightness as well as the resistance are linked and depend on the title of the thread and the material used.
A titre d'exemple, les titres se situent entre 20/1 et 200/2, en 1 ou 2 bouts, en fil continu ou filé de fibres. On obtient des textiles entre 20 et 200g/m2 pour une épaisseur de l'ordre de 1/I0mm.For example, the titles are between 20/1 and 200/2, in 1 or 2 ends, in continuous or spun yarn. fibers. Textiles are obtained between 20 and 200 g / m 2 for a thickness of the order of 1/10 mm.
La résistance minimale est par exemple de l'ordre de 30cN/tex et la bande de support 12 présente par exem- pie des pores carrés dont les dimensions sont comprises entre 2/lOmm et 7/l0mm.The minimum resistance is, for example, of the order of 30cN / tex and the support strip 12 has, for example, square pores whose dimensions are between 2/10 mm and 7/10 mm.
Cette bande de support empêche les emmêlements entre les spires lors du bobinage et du débobinage et permet également de déplacer la nappe unidirectionnelle en évitant toute traction sur les fibres de cette nappe de façon à leur épargner un effort pouvant désorganiser l'homogénéité des fibres de la nappe unidirectionnelle.This support strip prevents tangling between the turns during winding and unwinding and also allows the unidirectional sheet to be moved, avoiding any traction on the fibers of this sheet so as to save them a force which can disorganize the homogeneity of the fibers of the unidirectional tablecloth.
La nappe unidirectionnelle ainsi obtenue qui est composée de fibres discontinues et indépendantes les unes des autres est utilisée pour former une nappe multidirectionnelle en superposant plusieurs nappes unidirectionnelles et en les reliant entre elles, par exemple par couture, par tricotage, par aiguilletage ou encore par collage.The unidirectional tablecloth thus obtained which is composed of staple fibers and independent of each other is used to form a multidirectional tablecloth by superimposing several unidirectional tablecloths and connecting them together, for example by sewing, by knitting, by needling or by gluing .
Selon une variante, la bande poreuse peut être utilisée pour le transport et/ou le stockage d'au moins une nappe multidirectionnelle composée de plusieurs nappes unidirectionnelles superposées et non reliées entre elles.According to a variant, the porous strip can be used for transporting and / or storing at least one multidirectional sheet made up of several unidirectional sheets superimposed and not connected to each other.
La nappe unidirectionnelle peut être réalisée à partir de plusieurs câbles de même nature ou de natures dif- férentes .The unidirectional sheet can be made from several cables of the same kind or of different natures.
De même, la nappe multidirectionnelle peut être obtenue en superposant selon des directions différentes des nappes unidirectionnelles de même nature ou de natures différentes . Likewise, the multidirectional sheet can be obtained by superimposing unidirectional sheets of the same kind or of different natures in different directions.

Claims

REVENDICATIONS
1. Procédé d'élaboration d'une nappe fibreuse multidirectionnelle, dans lequel on superpose plusieurs nappes fibreuses unidirectionnelles (1) selon les directions différentes et on relie lesdites nappes unidirectionnelles ^1) entre elles, caractérisé en que .1. Method for making a multidirectional fibrous web, in which several unidirectional fibrous webs (1) are superposed in different directions and said unidirectional webs ^ 1) are connected together, characterized in that.
- on forme, a partir d'au moins un câble, au moins une desdites nappes unidirectionnelles composée de fibres discontinues et indépendantes les unes des autres, - on applique ladite nappe unidirectionnelle (1) sur une bande de support (12) continue et poreuse, on entraîne en translation 1 ' ensemble formé par la bande de support (12) et la nappe unidirectionnelle- At least one of said unidirectional plies composed of discontinuous and independent fibers is formed from at least one cable, - said unidirectional ply (1) is applied to a continuous and porous support strip (12) , one drives in translation the assembly formed by the support strip (12) and the unidirectional ply
' l ι en exerçant une traction sur cette banαe de support (12) et a une vitesse sensiblement égale à la vitesse d'avance de cette nappe unidirectionnelle (1) ,'l ι by exerting traction on this support banαe (12) and at a speed substantially equal to the speed of advance of this unidirectional sheet (1),
- on maintient les fibres de cette nappe (1) sur la bande de support (12) ,the fibers of this ply (1) are maintained on the support strip (12),
- on sépare la nappe unidirectionnelle (1) de la bande de support (12) ,- the unidirectional sheet (1) is separated from the support strip (12),
- et on superpose ladite nappe unidirectionnelle (1) avec au moins une autre nappe unidirectionnelle.- And superimposing said unidirectional sheet (1) with at least one other unidirectional sheet.
2. Procédé selon la revendication 1, caractérisé en ce que l'on maintient les fibres de ladite nappe unidi- rectionnelle (1) sur la bande de support \12) par aspiration à travers ladite bande.2. Method according to claim 1, characterized in that the fibers of said unidirectional ply (1) are maintained on the support strip \ 12) by suction through said strip.
3. Procédé selon la revendication 1 ou 2 , caractérisé en ce qu'après la formation de la nappe unidirectionnelle (1), on pulvérise sur les fibres de ladite nappe uni- directionnelle un produit tensioact f ou de l'eau.3. Method according to claim 1 or 2, characterized in that after the formation of the unidirectional sheet (1), is sprayed on the fibers of said unidirectional sheet a surfactant f or water.
4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'avant la séparation entre la nappe unidirectionnelle X i et la bande de support4. Method according to any one of the preceding claims, characterized in that before the separation between the unidirectional sheet X i and the support strip
(12) , on bobine l'ensemble formé par la nappe unidirection- nelle (1) et la bande de support (12) à une vitesse sensiblement égale à la vitesse d'avance de cette nappe unidirectionnelle Cl) après sa formation, on stocke cet ensemble, puis on déroule ledit ensemble et, après la séparation entre ladite nappe unidirectionnelle (1) et la bande de support(12), the assembly formed by the unidirectional sheet (1) and the support strip (12) is wound at a speed substantially equal to the speed of advance of this unidirectional sheet C1) after its formation, it is stored this set, then unrolling said assembly and, after separation between said unidirectional sheet (1) and the support strip
(12) , on bobine cette bande de support (12) à une vitesse sensiblement égale à la vitesse de déroulement dudit ensem- ble.(12), this support strip (12) is wound at a speed substantially equal to the speed of unwinding of said assembly.
5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les fibres de ladite nappe unidirectionnelle (l)sont en une matière choisie parmi le carbone, le verre, des céramiques, des aramides, le carbure de silicium ou des fibres minérales ou des fibres thermofusibles ou des fibres thermocollantes ou tout mélange de ces fibres.5. Method according to any one of the preceding claims, characterized in that the fibers of said unidirectional sheet (l) are made of a material chosen from carbon, glass, ceramics, aramids, silicon carbide or fibers mineral or hot-melt fibers or fusible fibers or any mixture of these fibers.
6. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la bande de support (12) est en un matériau textile.6. Method according to any one of claims 1 to 4, characterized in that the support strip (12) is made of a textile material.
7. Procédé selon la revendication 6, caractérisé en ce que le textile de la bande de support (12) est réalisé à partir d'une matière choisie parmi le polyéthylène , le polyamide, le polyester, le polypropylène, la viscose. 7. Method according to claim 6, characterized in that the textile of the support strip (12) is made from a material chosen from polyethylene, polyamide, polyester, polypropylene, viscose.
8. Procédé selon la revendication 6 ou 7 , caractérisé en ce que le textile présente des pores par exemple carrés, de dimensions comprises entre 2/l0mm et 7/l0mm.8. Method according to claim 6 or 7, characterized in that the textile has pores, for example square, of dimensions between 2 / 10mm and 7 / 10mm.
9. Procédé selon l'une quelconque des revendications 6 à 8, caractérisé en ce que la bande de support (12) comporte sur chacune de ses lisières un bourrelet continu (12a) .9. Method according to any one of claims 6 to 8, characterized in that the support strip (12) comprises on each of its selvedges a continuous bead (12a).
10. Procédé selon l'une quelconque des revendications 6 à 9, caractérisé en ce que la bande de support (12) présente une largeur légèrement supérieure à la largeur de la bande unidirectionnelle.10. Method according to any one of claims 6 to 9, characterized in that the support strip (12) has a width slightly greater than the width of the unidirectional strip.
11. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la nappe unidirectionnelle (1) est obtenue par craquage, cardage, convertissage ou étirage avec ou sans barrette. 11. Method according to any one of claims 1 to 5, characterized in that the unidirectional sheet (1) is obtained by cracking, carding, converting or stretching with or without bar.
12. Installation d'élaboration d'une nappe fibreuse multidirectionnelle réalisée par superposition de nappes fibreuses unidirectionnelles (1) selon des directions différentes et reliées entre elles, caractérisée en ce qu'elle comprend :12. Installation for developing a multidirectional fibrous web produced by superimposing unidirectional fibrous webs (1) in directions different and interconnected, characterized in that it comprises:
- des moyens (10) de formation, à partir d'au moins un câble, d'au moins une desdites nappes unidirection- nelles composés de fibres discontinues et indépendantes les unes des autres, des moyens (11) de déroulement d'une bande continue et poreuse, de support des fibres de ladite nappe unidirectionnelle (1), - des moyens (15 ; 35 ; 55) d'entraînement en translation de l'ensemble formé par la bande de support (12) et la nappe unidirectionnelle (1) en exerçant une traction sur cette bande de support (12) et à une vitesse sensiblement égale à la vitesse d'avance de cette nappe après sa formation,- Means (10) for forming, from at least one cable, at least one of said unidirectional plies composed of staple fibers and independent of each other, means (11) for unwinding a strip continuous and porous, for supporting the fibers of said unidirectional ply (1), - means (15; 35; 55) for driving in translation the assembly formed by the support strip (12) and the unidirectional ply (1 ) by exerting traction on this support strip (12) and at a speed substantially equal to the speed of advance of this sheet after its formation,
- des moyens (20) de maintien des fibres de la nappe unidirectionnelle (1) sur la bande de support (12) au cours de son transport,means (20) for holding the fibers of the unidirectional ply (1) on the support strip (12) during its transport,
- des moyens de séparation de la nappe unidirec- tionnelie (1) de la bande de support (12),means for separating the unidirectional ply (1) from the support strip (12),
- et des moyens de superposition de ladite nappe unidirectionnelle (1) avec au moins une autre nappe unidirectionnelle .- And means for superimposing said unidirectional ply (1) with at least one other unidirectional ply.
13. Installation selon la revendication 12, ca- ractérisée en ce qu'elle comprend des moyens (30) de bobinage de l'ensemble formé par la nappe unidirectionnelle (1) et la bande de support (12) .13. Installation according to claim 12, characterized in that it comprises means (30) for winding the assembly formed by the unidirectional ply (1) and the support strip (12).
14. Installation selon la revendication 12, caractérisée en ce qu'elle comprend des moyens (40) de dévi- dage d'une bobine (31) de l'ensemble formé par la nappe unidirectionnelle (1) et la bande de support (12) .14. Installation according to claim 12, characterized in that it comprises means (40) for unwinding a coil (31) of the assembly formed by the unidirectional ply (1) and the support strip (12 ).
15. Installation selon la revendication 12, caractérisée en ce qu'elle comprend des moyens (25 ; 50) de bobinage de la bande de support (12) . 15. Installation according to claim 12, characterized in that it comprises means (25; 50) for winding the support strip (12).
16. Installation selon les revendications 12 et16. Installation according to claims 12 and
13, caractérisée en ce que les moyens (30) de bobinage de l'ensemble sont formés par un cylindre (32 ; 33) d'enroulé- ment dudit ensemble monté libre en rotation et déplaçabie verticalement et par lesdits moyens (35) d'entraînement agissant sur la face externe de la bande de support (12) au cours de son enroulement .13, characterized in that the means (30) for winding the assembly are formed by a cylinder (32; 33) wound ment of said assembly mounted free in rotation and displaceable vertically and by said drive means (35) acting on the external face of the support strip (12) during its winding.
17. Installation selon les revendications 12 et 14, caractérisée en ce que les moyens (40) de dévidage de la bobine (31) sont formés par un support (41) sur lequel ladite bobine (31) est montée libre en rotation et déplaçabie verticalement et par un organe (45) d'appui sur la face externe de la bande de support (12) .17. Installation according to claims 12 and 14, characterized in that the means (40) for unwinding the reel (31) are formed by a support (41) on which said reel (31) is mounted free in rotation and displaceable vertically and by a member (45) bearing on the external face of the support strip (12).
18. Installation selon la revendication 17, caractérisée en ce que l'organe (45) d'appui est formé par une bande (46) sans fin et libre en translation.18. Installation according to claim 17, characterized in that the support member (45) is formed by an endless band (46) and free in translation.
19. Installation selon la revendication 17, ca- ractérisée en ce que l'organe d'appui est formé par au moins un rouleau horizontal et libre en rotation.19. Installation according to claim 17, characterized in that the support member is formed by at least one horizontal roller and free in rotation.
20. Installation selon la revendication 12, caractérisée en ce que les moyens (25 ; 50) de bobinage de la bande de support (12) sont formés par un cylindre (26, 27 ; 51, 52) d'enroulement de ladite bande monté libre en rotation et déplaçabie verticalement et par lesdits moyens (15 ; 55) d'entraînement agissant sur la face externe de la bande de support (12) au cours de son enroulement.20. Installation according to claim 12, characterized in that the means (25; 50) for winding the support strip (12) are formed by a cylinder (26, 27; 51, 52) for winding said mounted strip free in rotation and displaceable vertically and by said drive means (15; 55) acting on the external face of the support strip (12) during its winding.
21. Installation selon la revendication 16 eu 20, caractérisée en ce que les moyens (15 ; 55) d'entraînement sont formés par une bande sans fin (16 ; 56 entraînée en translation à une vitesse sensiblement égale à la vitesse d'avance de la nappe unidirectionnelle (1) après sa formation et en contact avec la face externe de la bande de sup- port (12) .21. Installation according to claim 16 or 20, characterized in that the drive means (15; 55) are formed by an endless belt (16; 56 driven in translation at a speed substantially equal to the speed of advance of the unidirectional ply (1) after its formation and in contact with the external face of the support strip (12).
22. Installation selon la revendication 16 ou 20, caractérisée en ce que les moyens (15 ; 55; d'entraînement sont formés par au moins un rouleau horizontal et entraîné en rotation à une vitesse sensiblement (1) égale à la vitesse d'avance de la nappe unidirectionnelle après sa formation et en contact avec la face externe de la bande de support (12) . 22. Installation according to claim 16 or 20, characterized in that the drive means (15; 55; are formed by at least one horizontal roller and driven in rotation at a speed substantially (1) equal to the speed of advance of the unidirectional sheet after its formation and in contact with the external face of the support strip (12).
23. Installation selon la revendication 22, caractérisée en ce que ledit rouleau est muni à chacune de ses extrémités de picots coopérant avec les lisières de la bande de support . 23. Installation according to claim 22, characterized in that said roller is provided at each of its ends with pins cooperating with the edges of the support strip.
24. Installation selon la revendication 12, caractérisée en ce que les moyens (20) de maintien des fibres de la nappe unidirectionnelle (1) sur la bande de support (12, sont formés par un système (211 d'aspiration disposé au-dessous de ladite bande de support (12) . 24. Installation according to claim 12, characterized in that the means (20) for holding the fibers of the unidirectional sheet (1) on the support strip (12, are formed by a system (211 of suction disposed below of said support strip (12).
25. Installation selon l'une quelconque des revendications 12 à 24, caractérisée en ce qu'elle comprend des moyens de pulvérisation d'un produit tensioactif ou de l'eau sur les fibres de ladite nappe unidirectionnelle (1) .25. Installation according to any one of claims 12 to 24, characterized in that it comprises means for spraying a surfactant or water on the fibers of said unidirectional sheet (1).
26. Nappe fibreuse unidirectionnelle, caractéri- sée en ce qu'elle est formée de fibres discontinues et indépendantes les unes des autres obtenues à partir d'au moins un câble pour confectionner au moins une nappe multidirectionnelle .26. Unidirectional fibrous web, characterized in that it is formed of discontinuous fibers independent of each other obtained from at least one cable to make at least one multidirectional web.
27. Nappe selon la revendication 26, caractéri- sée en ce qu'elle est en fibre de carbone, de verre, de céramique, d'aramide, de carbure de silicium ou en fibres minérales ou des fibres thermofusibles ou des fibres thermocollantes ou tout mélange de ces fibres.27. A tablecloth according to claim 26, characterized in that it is made of carbon fiber, glass, ceramic, aramid, silicon carbide or mineral fibers or hot-melt fibers or fusible fibers or any mixture of these fibers.
28. Nappe fibreuse multidirectionnelle compre- nant plusieurs nappes unidirectionnelles il) superposées selon des directions différentes et reliées entre elles, caractérisée en ce qu'elle comprend au moins une nappe unidirectionnelle (1) selon la revendication 26 ou 27. 28. Multidirectional fibrous sheet comprising several unidirectional sheets il) superimposed in different directions and connected to each other, characterized in that it comprises at least one unidirectional sheet (1) according to claim 26 or 27.
EP00974650A 1999-11-12 2000-11-03 Method and installation for producing a multidirectional textile web Withdrawn EP1244834A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9914238A FR2801064B1 (en) 1999-11-12 1999-11-12 METHOD AND INSTALLATION FOR THE PREPARATION OF A MULTIDIRECTIONAL FIBROUS TABLECLOTH
FR9914238 1999-11-12
PCT/FR2000/003071 WO2001034892A1 (en) 1999-11-12 2000-11-03 Method and installation for producing a multidirectional textile web

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CH695692A5 (en) * 2001-08-21 2006-07-31 Rieter Ag Maschf Winding device for producing a lap roll.
JP5014070B2 (en) * 2007-11-06 2012-08-29 イビデン株式会社 Mat material and exhaust gas treatment device
CN103015039B (en) * 2012-12-04 2015-02-18 江苏六鑫洁净新材料有限公司 Two-component melt-blown automatic mixing system
CN104805597B (en) * 2015-04-13 2017-04-12 太仓安佑无纺科技有限公司 Vertical type net laying device capable of adjusting upright cotton density
EP3421654B1 (en) * 2017-06-27 2021-04-07 Reifenhäuser GmbH & Co. KG Maschinenfabrik Device with at least one particle and/or fibre generating device and at least one endless belt

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