EP1367165B1 - Suction roller for processing a sheet of textile fibres or an equivalent product - Google Patents

Suction roller for processing a sheet of textile fibres or an equivalent product Download PDF

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Publication number
EP1367165B1
EP1367165B1 EP03291165A EP03291165A EP1367165B1 EP 1367165 B1 EP1367165 B1 EP 1367165B1 EP 03291165 A EP03291165 A EP 03291165A EP 03291165 A EP03291165 A EP 03291165A EP 1367165 B1 EP1367165 B1 EP 1367165B1
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EP
European Patent Office
Prior art keywords
suction
roller
roller according
zone
web
Prior art date
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Expired - Lifetime
Application number
EP03291165A
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German (de)
French (fr)
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EP1367165A1 (en
Inventor
François LOUIS
Bernard Chatelet
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Asselin Thibeau SAS
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Asselin Thibeau SAS
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G25/00—Lap-forming devices not integral with machines specified above
    • 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
    • D04H1/74—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 orientated, e.g. in parallel (anisotropic fleeces)

Definitions

  • the present invention relates to a suction roll for treating a web of textile fibers or equivalent product where appropriate denser and / or thick as a web, a ribbon etc.
  • the document FR 1,500,746 discloses a suction cylinder used to drive a web of textile fibers and detach it, for example a carded web out of doffer, or to redistribute a web in a spreader-lapper.
  • the suction cylinder described is hollow with a perforated cylindrical wall or made permeable to air. It has a suction sector delimited by partitions and which is put in depression. According to one example described, the suction is done via a perforated tube coaxial or not with suction at both ends, the perforations of the tube being distributed and / or of dimensions such that uniform suction is ensured on any the length of the tube.
  • two symmetrically mounted suction rollers serve to take up and fold a web in a movable exit carriage moved back and forth over a veil receiving apron. folded arranged perpendicularly.
  • These two suction rollers are connected alternately to the means producing the suction, the web guided between the two rollers being alternately sucked by one or other of the rollers in the direction of movement of the movable carriage.
  • the document EP 0 733 729 discloses a suction roll used to transfer a fibrous web between a conveyor belt and two calendering rolls at the outlet of the card, thereby reducing the stretching of the web and avoiding floating problems.
  • the suction cylinder is interposed on the course of the sail between the conveyor belt and the two cylinders of calendering. At the suction cylinder, the web is sucked to the surface of said cylinder and is maintained by suction to a pre-calendering zone between the suction cylinder and the lower calender roll.
  • the suction cylinder is made for example from a perforated metal sheet. It comprises a suction sector delimited by partitions whose angular positioning is adjustable.
  • the document FR 2,612,949 discloses a device for consolidating a textile web or equivalent in which the web is passed through the slot formed by at least two juxtaposed rollers, applying a pressure.
  • the two rollers are hollow, their peripheral surface being perforated or screened.
  • the escape of the air produced during the compression of the web can be done radially by penetrating inside the two perforated rollers.
  • the perforated rollers can be subjected to the action of a suction.
  • the authors advocate that the diameter of the perforations be equal to or less than the depth of the perforations, so that the fibers are not driven through the perforations with the air escaping from the veil.
  • they may have an enlarged configuration towards the inside of the roll and the edges of the perforations directed towards the associated roller, preferably with a rounded edge.
  • the document EP 0 071 033 discloses a sail spreader for forming a multi-ply nonwoven fabric, using, to limit the floating of the web, air-permeable transfer means: a perforated endless belt, a movable perforated roll-over roller, and and-forth transferring the veil to a second perforated endless belt placed below the first mat, two perforated folding rollers movable back and forth taking up the veil after turning on the second endless belt.
  • the desired effect is to press the veil on the transfer means using a suction controlled throughout its path in the mobile carriage and so that the veil remains homogeneous until it is deposited.
  • the present invention aims in particular to overcome these disadvantages, by proposing a solution to obtain an improved suction efficiency and thus a good hold of the veil without it being deformed, without attachment of the fibers, whatever their size, the suction roll having a high vacuum level while maintaining a very good mechanical strength.
  • a suction roll for the treatment of a veil of textile fibers or equivalent product where appropriate denser or thicker such as a sheet, a ribbon etc., said roll being hollow connected to a suction source and having a cylindrical wall provided with suction orifices, characterized in that said suction orifices open into at least one vacuum chamber formed in the cylindrical wall between support zones for the web.
  • the air present in the textile web is effectively sucked radially towards the inside of the roll but the web remains guided on the support zones without being in contact with the orifices. suction.
  • the vacuum chambers due to their function, are larger in size than the suction ports, which has the consequence that the suction surface of the roller to the right of the vacuum chambers between the support zones is increased compared to the state of the art, while retaining a good mechanical strength for the roll. This advantage is important for most applications where the suction roll is a wear part. With a roll according to the invention, more than 90% of the surface of the textile product can be exposed to suction against less than 40% with a conventional perforated roll.
  • the cylindrical wall is provided with perforations which are staggered and comprise a lower stage forming the suction orifice opening into a larger-sized upper stage. (For example due to a conical or flared shape) forming said vacuum chamber.
  • the suction orifices are arranged in the bottom of grooves, a vacuum chamber being created between the bottom of each groove and its two adjacent ridges, the ridges of grooves forming the bearing zones for the veil.
  • the grooves have a substantially triangular cross-sectional profile, this conformation permitting suction over substantially the entire surface of the web.
  • the suction ports can be offset in staggered between two adjacent grooves, this in particular to avoid the marking of lines on the web and to give the roll a better mechanical strength.
  • the ridges of the grooves are rounded to avoid any risk of attachment of the web on the roll.
  • the ridges of the flutes extend perpendicular to the direction of the fibers of the web.
  • the grooves may thus be for example circumferential, that is to say, perpendicular to the axis of revolution of the roll, axial, that is to say parallel to the axis of revolution of the roll, helical or describing two propellers inverses substantially meeting in the central portion of the roll. This last configuration has the additional effect of counteracting if necessary a lateral stretching of the veil.
  • the pitch of the splines or the spacing of the perforations, as well as the depth of the splines or perforations depend on the characteristics of the fibers (length and denier) and the shape (holes or slots) and the spacing of the suction orifices depend on the applications targeted and the density of the veil.
  • the suction is effective only in the active zone of the roll, that is to say in the passage area of the web on the roller where the sail needs to be maintained and guided to avoid its floating. It is defined by deflection means disposed within the roller.
  • the deflection means may comprise two radial deflectors optionally with a variable angular spacing or an optionally arcuate bent deflector telescopically variable length. It is also possible to use a tube inserted inside the suction roll and comprising an air permeable zone and an impervious deflector zone, the suction means being placed in communication with the inside of said tube.
  • the roller according to the invention can be manufactured for example from a sheet which is perforated using appropriate means, then welded to form the roll, or by spinning, machining or foundry.
  • the material is chosen according to the application, for example a light alloy of aluminum which is then subjected to an electrochemical surface treatment to harden it, or a material based on carbon fibers or steel.
  • the change of direction of a web may be the position of the suction roller (generatrix of the curvature perpendicular or oblique with respect to the direction of arrival of the web on the first belt) and the direction of advance of the receiving belt, defining the direction taken then by the sail taken up by the receiving belt.
  • One of the common applications may be the 90 ° change of direction of a web substantially in the same plane with flipping of the sail or the complete reversal of a sail in a mobile spreader-entry input carriage.
  • the present invention is particularly interesting for this latter application, because in a mobile spreader-entry sled, the web is subjected not only to its own inertia due to its transport speed relative to the carriage, but also to a force centrifugal during its reversal, which make the veil really needs to be controlled during its turnaround.
  • the reversal of the web in the input carriage is therefore one of the critical moments where the web may peel and deform, limiting the speed of the spreader (see in particular the EP 0 517 563 ).
  • the veil is correctly controlled when it is turned over in the mobile entry carriage of the crosslapper, which makes it possible to increase the speed of movement back and forth of the trolley without deforming the veil and thus increasing the speed of tablecloth production. Thanks to a better sail quality, also because it no longer needs to be stretched or stretched at the entry of the spreader-lapper, it is possible to reduce the number of folds of the sheet and also to increase the productivity .
  • This is particularly interesting for a condensed web.
  • the invention makes it possible to coat the web with the condensation rate adapted to respect the MD / CD (machine direction resistance / transverse direction) desired while maintaining the quality of the final web and increasing the productivity of the installation. Furthermore, thanks to the invention, it was found that the control of sails based on short and volatile fibers such as viscose, was possible, allowing in some cases to triple the production of the crosslapper.
  • the suction according to the invention may also have an additional effect of consolidation on the web by causing the packing or even the interlacing of fibers.
  • the web may be less thick than in the state of the art, which facilitates entry into a next machine, for example in a needling machine.
  • the consolidation of the haze also has the very advantageous effect of reducing the frequency of cleaning machines since the fibers are better held in the web or the web and do not scatter in the machine.
  • the figure 1 shows schematically and in part an example of spreader-launcher of the state of the art in which there is a transfer of web between two solid mats.
  • the veil 1 arrives continuously on a carpet full of endless arrival 2, then, in a movable entrance trolley back and forth 3 where it performs a half-turn to be taken again by a carpet full receiver without end 4 continuously fed into said carriage 3 with a direction opposite to the arrival direction of the solid carpet 2.
  • the web 1 is clamped between the two solid mats 2 and 4.
  • the function of the input carriage 3 is to make the continuous arrival of the web on the first web 2 compatible with the unwinding of the web at the output of the exit trolley 5, by varying the length of the niping zone P. , unwinding varying according to the position of the output carriage 5 and the opposite direction or no advance of the carriage 5 relative to the advancing direction of the web on the carpet 2.
  • the solid carpet 2 is guided by two guide rollers 7 and 8 carried by the mobile carriage 2 defining an inclined section 9 so that the web 1 carried by this carpet then performs around the second roller 8 a turn that is less than 180 °.
  • the path of the second solid carpet 4 is for its part defined by four guide rollers 10, 11, 12 and 13 carried by the input carriage 2 and arranged so that, on the one hand, a pinch line 14 is formed between the guide roller 8 of the first belt 2 around which the web 1 makes its turn and one of the guide rollers (11 on the figure 1 ) of the second belt 4 and, secondly, that the second belt 4 is brought near the roller 8 to resume the web 1 at its output.
  • FIG. 2 there is shown a transfer device between two solid mats applied to a movable plow-lapper inlet carriage that can replace the carriage 3 described above (the same references are used hereinafter for the elements common to the two figures) .
  • the first solid carpet 2 reverses around three guide rollers driven in the same direction: an upper roll 20, an intermediate roll 21 and a lower roll 22.
  • the intermediate roll 21 is placed so as to define a cross section in turn. point for the belt 2 with an inclined portion 23 before the roller 21 and an inclined portion 24 after the roller 21.
  • the second solid carpet 4 is guided for its part in the movable carriage 3 by three guide rollers: the belt is guided in "S" around an upper roll 41, then around an intermediate roll 42 driven in the opposite direction, then a lower roll 43 bringing the belt 4 at the appropriate level relative to the solid carpet 2 to achieve the pinching zone P defined between the two mobile entry and exit carriages. All guide rollers are attached to the carriage frame and automatically rotated with the movement of the corresponding belt.
  • the transfer device comprises a suction roll 31 which is fixed to the frame of the carriage 3 and positioned in front of the inclined portion 24 at a Minimum distance of the belt 2.
  • the diameter of the roller 31 and its position are also preferably chosen so that the transfer of the web 1 around the periphery of the suction roller is substantially tangential and minimizing the empty distance d between the intermediate roller 21 and the transfer roller 31 and also that the transfer of the web of the roller 31 is then made closer in the plane of the second solid carpet 4.
  • the rotation of the suction roller 31 is provided through a coupling 44 with the guide roller 42 of the second solid carpet 4, the latter being due to the configuration "S" driven in the appropriate direction of rotation so that the web 1 and the solid carpet 4 arrive in the same direction after the reversal of the sail and especially advantageously at the same speed.
  • the solid carpet 4 can block the phenomena of compression or depression due to the displacement of the carriage; this can be recommended in extreme cases of speed.
  • the cylindrical wall of the roller 31 is permeable to air and laterally connected to a controlled suction source to maintain the veil during its overturning.
  • the means used to feed the suction roller 31 with a mobile suction may comprise an on-board fan, or a flexible or telescopic pipe system connected to a fixed fan, or a connection nozzle connected to a suction manifold.
  • the connection to the suction means is effected by each end of the roll.
  • Deflection means schematically represented by the arcuate deflector 46 make it possible to define an effective suction zone in the curvature effected by the web.
  • the figure 3 shows an alternative embodiment according to which, the web 1 is transferred not directly to the suction roll 31 but on a small endless perforated belt 50 mounted around the suction roller 31 and two guide rollers 51 and 52 arranged opposite the portion of carpet full inclined 23 near respectively the guide rollers 21 and 22.
  • This construction limits the vacuum zones between the suction roller 31 and the carpet 2 in which the web is not controlled.
  • the figure 4 shows yet another alternative embodiment in which an "S" configuration is used for the solid carpet 2 with the provision of an additional guide roller 53 in a plane behind the two guide rollers 21 and 22, which allows these two guide rollers 21 and 22 to be brought closer to the suction roller 31 and thus to reduce the empty spaces between the belt 2 and the roller 31.
  • a substantially straight inlet of the conveyor belt 4 guided in the movable carriage 3 by at least one guide roller 54 is alternatively represented.
  • a straight inlet of the conveyor belt 2 is obtained with the removal of the inclined portion 23.
  • the figure 5 shows another variant of embodiment of the staple-lapper entry trolley 3 implementing a second suction roll 60 according to the invention placed above the web 1, before it is turned over, between the belt 2 and the roller 31 , to further control the web in the corresponding vacuum zone between them.
  • the belt 2 is guided around a first guide roller 61 and a second guide roller 62, between which is defined an inclined belt portion 63 so that the belt 2 then turns on the roll 62 of turning less than 180 °.
  • This inclined portion also allows a transfer over a greater angular extent of suction of the upper suction roll 60.
  • the transfer of the suction roll 60 on the roll-up roller 31 is performed by the relative positioning of the active suction zones.
  • the belt 4 is guided opposite the suction rollers 60 and 31 around two upper guide rollers 64 and lower 65 so as to describe an "S" path.
  • this configuration makes it possible to couple the guide roller 64 and the suction roller 60 and the guide roller 65 and the suction roller 31 to drive them together.
  • This configuration with the inclined plane 63, allows to place the two mats 2 and 4 substantially at the same level, and the top of the roller 63. This avoids ventilation due to movement back and forth of the carriage.
  • a suction roller 100 is hollow having a cylindrical wall provided on its outer surface with grooves 102 here axial extending over the length of the roller and two opposite ends 100A, 100B.
  • Each groove 102 may be defined by a ridge 103 framed by two bottoms 104, each bottom 104 being made permeable to the air by means of suction orifices 105 of appropriate shape and density, depending on the intended applications, the suction force depending on the density of the web or equivalent product in contact with the suction roller.
  • a perforated axial tube 106 is formed inside the roller 100 protruding on either side of its ends 100A, 100B, the ends of the tube 106 being connected in a manner known per se to an external source suction.
  • the roller 100 is adapted to be rotated with respect to the tube 106 along an axis A of rotation by means of appropriate ball bearings R
  • the effective suction zone (107 on the figure 6 ), at the inlet 109 of which a fiber web 108 is supported by the roll 100 and at the outlet 110 of which the web is released, is delimited here by two radial deflectors 111A and 111B which are connected to the axial tube 106.
  • deflectors may advantageously be provided with means for adjusting their spacing (illustrated by arrows F) so as to be able to adjust the angular extent of the suction zone 107.
  • the tube 106 is perforated on the side only. of the suction zone 107.
  • the blanks 110A, 110B facing each other of neighboring grooves 102 deviate from the common bottom 104 towards the outside of the roll, so that when one puts in depression inside the roll, a depression chamber C is formed between the bottom 104 of the grooves and the two ridges adjacent having a suction surface between two ridges 103 widened relative to the outlet section of the orifice 105 and offset relative thereto.
  • the suction power is adjusted, in particular as a function of the running speed of the web 108, so that it is held and guided on the ridges 103 of the grooves 103 through the vacuum chamber C.
  • the air present in the sail 108 is sucked radially where appropriate inside the roller through the orifices 105 (shown schematically by the arrows F2). Due to the presence of the vacuum chamber C, the fibers of the web are not in contact with the orifices 105 and are unlikely to come to block them.
  • a triangular shape in section of the grooves as on the figures 7 and 8 advantageously makes it possible to further increase the suction surface of the vacuum chambers C and thus to suck up the veil over substantially its entire surface while maintaining a good mechanical strength for the roll.
  • the ridges 103 of the grooves are advantageously rounded as shown also on the figures 7 and 8 .
  • the bottom 104 of the grooves is widened relative to the ridges 103 of the grooves to increase the size of the orifices 105 and thus the suction force.
  • suction zone on the circumference of the roll in the suction zone, there is a zone where the suction is stronger, for example corresponding to the place where the centrifugal force is the most important.
  • This stronger suction zone can be obtained with perforations in this zone of size and / or of greater density, preferably progressively, with respect to the remainder of the permeable zone.
  • orifices 105 which are provided aligned from one groove base 104 to another on the figure 8 but which could also be staggered from one flute bottom to another.
  • the shape of the orifices 105 may also vary, either homogeneously along the length of the roll, or inhomogeneous to create a desired suction effect, such as homogenization or concentration.
  • the cross-section of the flutes can be trapezoidal, with the short side of the trapezium corresponding to the flute ridge, so as to enlarge the support surfaces of the veil when necessary.
  • the following values may be given for information only: a roll diameter of the order of one or several hundred mm and a depth and no groove of the order of a few mm.
  • FIG. 10 and 11 a second embodiment of the perforated cylindrical wall according to the invention has been schematized.
  • circular and two-stage perforations 200 are formed in the cylindrical wall, comprising a lower stage consisting of a suction orifice 205 opening into an upper stage of dimensions greater than the orifice 205 forming the chamber.
  • Support zones 203 for a web are thus formed on the surface of the wall between the perforations 200, said support zones being larger or smaller depending on the spacing of the perforations.
  • the shape of the vacuum chamber C may be conical or substantially parallelepipedic as shown in FIG. figure 11 , with a suction port in its bottom.
  • FIG. 12 On the Figures 12 and 13 two embodiments of the deflection means are shown. On the figure 12 it is a two-part 115 bent deflector 115A, 115B whose end portions are telescopically stackable to adjust the angular extent of deflection.
  • This design has the advantage of allowing adjustment of the angle of coverage of the web by the suction roll and thus cover several mounting configurations with the same roller design.
  • the same adjustable suction roller may be used to transfer a web between a card and a lapper at any angle between the incoming carpet and the carpet coming out.
  • FIG. 13 it is a tube 116 inserted inside the suction roll 100 and having an air permeable arcuate zone 116A and an arcuate deflection zone 116B having a greater radius of curvature than that of the permeable wall zone 116A for plugging the suction orifices 105 of the roll, the two zones 116A and 116B being connected by radial walls 117 and 118.
  • the deflector 116A then performs a diffuser function so as to homogenize the depression in the pre-chamber over the entire length of the suction roll.
  • the figure 14 illustrates another possible application of sail transfer using a suction roll according to the invention.
  • the transfer device serves to deposit a second web 80 on a first web 81 at the entrance of a crosslapper in order to form a double-web web at the outlet.
  • the first web is brought to a first full carpet 82.
  • the second web is brought to a second full carpet 83 moved in the same direction as the carpet 82 but in a plane above.
  • the belt 83 is guided on an inclined portion 86 defined between two upper guide rolls 87 and 88 and a lower guide roller 89 located in a plane closer to the belt 82 and around which the carpet 83 reverses to start in the opposite direction.
  • the controlled transfer of the veil on the belt 82 is performed by means of a suction roller 90 according to the invention, placed above the veil 80 so that the veil is maintained by suction before being deposited on the veil 81.
  • the figure 15 illustrates another possible application according to the invention.
  • the suction roller is used to effect a reversal of the sail to apply a change of direction at 90 ° to the web substantially in the same plane.
  • a web 91 arrives on a first solid carpet 92 which performs a half-turn using an oblique guide roller 93.
  • a suction roller 94 according to the invention is placed near the roller 93 to take the web 91. The latter is then supported by the suction roller 94, follows a curvature corresponding to a turnaround to be substantially in the same plane, the position of the suction roller 94 defining the direction in which the sail 91 leaves on the second carpet full of transport 95.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

The suction roller (100) is hollow and has surface holes connected to an internal suction source. The holes are located in the base of converging suction chambers in the form of channels created between surface ridges. The ridges can run lengthwise along the roller, circumferentially or in a spiral line, and their crests (102) support the fibre mat. The ridges can be triangular in section with rounded crests, or trapezoid, with the crests formed by their smaller edges, and the suction holes can be in rows staggered between adjacent channels. The dimensions of the inner suction zone (107) can be defined by inner radial deflectors (111A, 111B) on either side of a perforated section of the roller's tubular axle (106).

Description

La présente invention concerne un rouleau aspirant pour le traitement d'un voile de fibres textiles ou produit équivalent le cas échéant plus dense et/ou épais comme une nappe, un ruban etc.The present invention relates to a suction roll for treating a web of textile fibers or equivalent product where appropriate denser and / or thick as a web, a ribbon etc.

Dans le domaine textile des non tissés, les applications suivantes sont notamment connues.In the textile field of nonwovens, the following applications are in particular known.

Le document FR 1 500 746 décrit un cylindre aspirant utilisé pour entraîner un voile de fibres textiles puis le détacher, par exemple un voile cardé en sortie de peigneur, ou pour redistribuer un voile dans un étaleur-nappeur. Le cylindre aspirant décrit est creux avec une paroi cylindrique perforée ou rendue perméable à l'air. Il comporte un secteur d'aspiration délimité par des cloisons et qui est mis en dépression. Selon un exemple décrit, l'aspiration se fait par l'intermédiaire d'un tube perforé coaxial ou non avec aspiration à ses deux extrémités, les perforations du tube étant distribuées et/ou de dimensions telles qu'une aspiration uniforme est assurée sur toute la longueur du tube.The document FR 1,500,746 discloses a suction cylinder used to drive a web of textile fibers and detach it, for example a carded web out of doffer, or to redistribute a web in a spreader-lapper. The suction cylinder described is hollow with a perforated cylindrical wall or made permeable to air. It has a suction sector delimited by partitions and which is put in depression. According to one example described, the suction is done via a perforated tube coaxial or not with suction at both ends, the perforations of the tube being distributed and / or of dimensions such that uniform suction is ensured on any the length of the tube.

Dans l'application à un étaleur-nappeur décrite dans ce document, deux rouleaux aspirants montés symétriquement servent à reprendre et à plier un voile dans un chariot mobile de sortie déplacé en va-et-vient au dessus d'un tablier de réception du voile plié disposé perpendiculairement. Ces deux rouleaux aspirants sont reliés alternativement aux moyens produisant l'aspiration, le voile guidé entre les deux rouleaux étant alternativement aspiré par l'un ou l'autre des rouleaux selon le sens de déplacement du chariot mobile.In the application to a spreader-spreader described in this document, two symmetrically mounted suction rollers serve to take up and fold a web in a movable exit carriage moved back and forth over a veil receiving apron. folded arranged perpendicularly. These two suction rollers are connected alternately to the means producing the suction, the web guided between the two rollers being alternately sucked by one or other of the rollers in the direction of movement of the movable carriage.

Le document EP 0 733 729 divulgue un rouleau aspirant utilisé pour transférer en sortie de carde un voile fibreux entre un tapis de transport et deux cylindres de calandrage, cela permettant de diminuer l'étirage du voile et d'éviter les problèmes de flottement. Le cylindre aspirant est interposé sur le parcours du voile entre le tapis de transport et les deux cylindres de calandrage. Au niveau du cylindre aspirant, le voile se trouve plaqué par aspiration à la surface dudit cylindre et s'y trouve maintenu par aspiration jusqu'à une zone de pré-calandrage située entre le cylindre aspirant et le cylindre de calandrage inférieur. Le cylindre aspirant est réalisé par exemple à partir d'une tôle métallique perforée. Il comporte un secteur d'aspiration délimité par des cloisons dont le positionnement angulaire est réglable.The document EP 0 733 729 discloses a suction roll used to transfer a fibrous web between a conveyor belt and two calendering rolls at the outlet of the card, thereby reducing the stretching of the web and avoiding floating problems. The suction cylinder is interposed on the course of the sail between the conveyor belt and the two cylinders of calendering. At the suction cylinder, the web is sucked to the surface of said cylinder and is maintained by suction to a pre-calendering zone between the suction cylinder and the lower calender roll. The suction cylinder is made for example from a perforated metal sheet. It comprises a suction sector delimited by partitions whose angular positioning is adjustable.

Le document FR 2 612 949 divulgue un dispositif pour consolider un voile textile ou équivalent dans lequel on fait passer le voile dans la fente formée par au moins deux rouleaux juxtaposés, en appliquant une pression. Les deux rouleaux sont creux, leur surface périphérique étant perforée ou grillagée. L'échappement de l'air produit au cours de la compression du voile peut se faire radialement en pénétrant à l'intérieur des deux rouleaux perforés. En outre, les rouleaux perforés peuvent être soumis à l'action d'une aspiration. Les auteurs préconisent que le diamètre des perforations soit égal ou inférieur à la profondeur des perforations, de sorte que les fibres ne soient pas entraînées à travers les perforations avec l'air qui s'échappe du voile. Par ailleurs, pour éviter que les fibres ne restent accrochées aux perforations, celles-ci peuvent avoir une configuration qui s'élargit vers l'intérieur du rouleau et les bords des perforations dirigés vers le rouleau associé de préférence à arête arrondie.The document FR 2,612,949 discloses a device for consolidating a textile web or equivalent in which the web is passed through the slot formed by at least two juxtaposed rollers, applying a pressure. The two rollers are hollow, their peripheral surface being perforated or screened. The escape of the air produced during the compression of the web can be done radially by penetrating inside the two perforated rollers. In addition, the perforated rollers can be subjected to the action of a suction. The authors advocate that the diameter of the perforations be equal to or less than the depth of the perforations, so that the fibers are not driven through the perforations with the air escaping from the veil. On the other hand, to prevent the fibers from being caught on the perforations, they may have an enlarged configuration towards the inside of the roll and the edges of the perforations directed towards the associated roller, preferably with a rounded edge.

Le document EP 0 071 033 décrit un étaleur de voile pour former un non-tissé constitué de plusieurs plis, utilisant, pour limiter le flottement du voile, des moyens de transfert perméables à l'air : un tapis sans fin perforé, un rouleau de retournement perforé mobile en va-et-vient transférant le voile sur un second tapis sans fin perforé placé en dessous du premier tapis, deux rouleaux de pliage perforés mobiles en va-et-vient reprenant le voile après retournement sur le second tapis sans fin. L'effet recherché est de plaquer le voile sur les moyens de transferts à l'aide d'une aspiration contrôlée tout au long de son cheminement dans le chariot mobile et de sorte que le voile reste homogène jusqu'au moment où il est déposé.The document EP 0 071 033 discloses a sail spreader for forming a multi-ply nonwoven fabric, using, to limit the floating of the web, air-permeable transfer means: a perforated endless belt, a movable perforated roll-over roller, and and-forth transferring the veil to a second perforated endless belt placed below the first mat, two perforated folding rollers movable back and forth taking up the veil after turning on the second endless belt. The desired effect is to press the veil on the transfer means using a suction controlled throughout its path in the mobile carriage and so that the veil remains homogeneous until it is deposited.

Comme autres applications connues mettant en oeuvre un rouleau aspirant, on peut aussi citer le contrôle d'un voile lors de son transfert entre tapis de sortie de carde et tapis plein d'entrée d'étaleur-nappeur ou le transfert entre les tapis inférieur et supérieur d'une carde double peigneur pour former un double voile.As other known applications using a suction roll, we can also mention the control of a web during its transfer between the card exit belt and the full carpet of the spreader-lapper inlet or the transfer between the lower belt and superior of a double doffer card to form a double sail.

Dans ces différentes applications, l'accrochage des fibres aux perforations et le bouchage de ces dernières, constituent les principaux problèmes rencontrés, diminuant l'efficacité de l'aspiration et les vitesses de transport et nécessitant un nettoyage des machines. Pour résoudre ces problèmes, il a été proposé, notamment dans les applications aux cardes (comme dans le document EP0733729 cité plus haut), d'utiliser des rouleaux fabriqués à partir de tôles minces ayant subies des micro-perforations par un traitement chimique. Toutefois, de tels rouleaux sont fragiles et leur tenue mécanique limite le taux de perforations, en général à 40%.In these different applications, the attachment of the fibers to the perforations and the clogging of the latter, are the main problems encountered, decreasing the efficiency of the suction and the transport speeds and requiring cleaning of the machines. To solve these problems, it has been proposed, especially in card applications (as in the document EP0733729 cited above), to use rolls made from thin sheets having undergone micro-perforations by a chemical treatment. However, such rolls are fragile and their mechanical strength limits the rate of perforations, generally to 40%.

La présente invention a pour but notamment de pallier ces inconvénients, en proposant une solution pour obtenir une efficacité de l'aspiration améliorée et donc une bonne tenue du voile sans qu'il ne se déforme, sans accrochage des fibres, quelque soit leur taille, le rouleau aspirant présentant un taux de vide élevé tout en conservant une très bonne tenue mécanique.The present invention aims in particular to overcome these disadvantages, by proposing a solution to obtain an improved suction efficiency and thus a good hold of the veil without it being deformed, without attachment of the fibers, whatever their size, the suction roll having a high vacuum level while maintaining a very good mechanical strength.

Elle propose un rouleau aspirant pour le traitement d'un voile de fibres textiles ou produit équivalent le cas échéant plus dense ou épais comme une nappe, un ruban etc., ledit rouleau étant creux relié à une source d'aspiration et présentant une paroi cylindrique munie d'orifices d'aspiration, caractérisé en ce que lesdits orifices d'aspiration débouchent dans au moins une chambre de dépression formée dans la paroi cylindrique entre des zones d'appui pour le voile.It proposes a suction roll for the treatment of a veil of textile fibers or equivalent product where appropriate denser or thicker such as a sheet, a ribbon etc., said roll being hollow connected to a suction source and having a cylindrical wall provided with suction orifices, characterized in that said suction orifices open into at least one vacuum chamber formed in the cylindrical wall between support zones for the web.

Grâce à cette chambre de dépression, l'air présent dans le voile textile est effectivement aspiré radialement vers l'intérieur du rouleau mais le voile reste guidé sur les zones d'appui sans être au contact des orifices d'aspiration. On élimine ainsi les risques d'entraînement et d'accrochage des fibres dans les orifices d'aspiration. De plus, les chambres de dépression, de part leur fonction, sont de dimensions plus grandes que les orifices d'aspiration, ce qui a pour conséquence que la surface d'aspiration du rouleau au droit des chambres de dépression entre les zones d'appui est augmentée par rapport à l'état de la technique, tout en conservant pour le rouleau une bonne tenue mécanique. Cet avantage est important pour la plupart des applications où le rouleau aspirant constitue une pièce d'usure. Avec un rouleau selon l'invention, plus de 90% de la surface du produit textile peut être exposée à l'aspiration contre moins de 40% avec un rouleau perforé classique.Thanks to this vacuum chamber, the air present in the textile web is effectively sucked radially towards the inside of the roll but the web remains guided on the support zones without being in contact with the orifices. suction. This eliminates the risk of entrainment and attachment of fibers in the suction ports. In addition, the vacuum chambers, due to their function, are larger in size than the suction ports, which has the consequence that the suction surface of the roller to the right of the vacuum chambers between the support zones is increased compared to the state of the art, while retaining a good mechanical strength for the roll. This advantage is important for most applications where the suction roll is a wear part. With a roll according to the invention, more than 90% of the surface of the textile product can be exposed to suction against less than 40% with a conventional perforated roll.

Selon un exemple de réalisation possible pouvant convenir typiquement pour des voiles faits de fibres orientées dans plusieurs directions, la paroi cylindrique est munie de perforations qui sont étagées comportant un étage inférieur formant l'orifice d'aspiration débouchant dans un étage supérieur de dimensions plus grandes (par exemple grâce à une forme conique ou évasée) formant ladite chambre de dépression.According to a possible example of embodiment that may be typically suitable for sails made of fibers oriented in several directions, the cylindrical wall is provided with perforations which are staggered and comprise a lower stage forming the suction orifice opening into a larger-sized upper stage. (For example due to a conical or flared shape) forming said vacuum chamber.

Selon un autre exemple de réalisation possible, les orifices d'aspiration sont disposés dans le fond de cannelures, une chambre de dépression étant créée entre le fond de chaque cannelure et ses deux crêtes voisines, les crêtes de cannelures formant les zones d'appui pour le voile.According to another example of possible embodiment, the suction orifices are arranged in the bottom of grooves, a vacuum chamber being created between the bottom of each groove and its two adjacent ridges, the ridges of grooves forming the bearing zones for the veil.

De préférence, les cannelures présentent un profil en coupe sensiblement triangulaire, cette conformation permettant une aspiration sur pratiquement toute la surface du voile. Les orifices d'aspiration peuvent être décalés en quinconce entre deux cannelures voisines, cela permettant notamment d'éviter le marquage de lignes sur le voile et de conférer au rouleau une meilleure résistance mécanique.Preferably, the grooves have a substantially triangular cross-sectional profile, this conformation permitting suction over substantially the entire surface of the web. The suction ports can be offset in staggered between two adjacent grooves, this in particular to avoid the marking of lines on the web and to give the roll a better mechanical strength.

De préférence encore, les crêtes des cannelures sont arrondies pour éviter tout risque d'accrochage du voile sur le rouleau. En outre, on peut prévoir un fond de cannelure élargi par rapport aux crêtes de cannelure pour pouvoir agrandir les orifices d'aspiration.More preferably, the ridges of the grooves are rounded to avoid any risk of attachment of the web on the roll. In addition, it is possible to provide a widened groove base with respect to the flute ridges in order to enlarge the suction openings.

De préférence encore, pour améliorer l'entraînement du voile sans accrochage des fibres, on fait en sorte que les crêtes des cannelures s'étendent perpendiculairement à la direction des fibres du voile. Les cannelures pourront être ainsi par exemple circonférentielles, c'est-à-dire perpendiculaires à l'axe de révolution du rouleau, axiales, c'est-à-dire parallèles à l'axe de révolution du rouleau, hélicoïdales ou décrivant deux hélices inverses se rejoignant sensiblement dans la partie centrale du rouleau. Cette dernière configuration a pour effet supplémentaire de contrecarrer le cas échéant un étirage latéral du voile.More preferably, to improve the entrainment of the web without the fibers adhering, it is arranged that the ridges of the flutes extend perpendicular to the direction of the fibers of the web. The grooves may thus be for example circumferential, that is to say, perpendicular to the axis of revolution of the roll, axial, that is to say parallel to the axis of revolution of the roll, helical or describing two propellers inverses substantially meeting in the central portion of the roll. This last configuration has the additional effect of counteracting if necessary a lateral stretching of the veil.

Le pas des cannelures ou l'écartement des perforations, ainsi que la profondeur des cannelures ou des perforations dépendent des caractéristiques des fibres (longueur et denier) et la forme (trous ou fentes) et l'espacement des orifices d'aspiration dépendent des applications visées et de la densité du voile.The pitch of the splines or the spacing of the perforations, as well as the depth of the splines or perforations depend on the characteristics of the fibers (length and denier) and the shape (holes or slots) and the spacing of the suction orifices depend on the applications targeted and the density of the veil.

Selon une autre caractéristique de l'invention, l'aspiration est effective seulement dans la zone active du rouleau, c'est-à-dire dans la zone de passage du voile sur le rouleau où le voile a besoin d'être maintenu et guidé pour éviter son flottement. Elle est définie par des moyens de déflection disposés à l'intérieur du rouleau. Les moyens de déflection peuvent comprendre deux déflecteurs radiaux avec éventuellement un écartement angulaire variable ou un déflecteur arqué éventuellement de longueur d'arc variable télescopiquement. On peut également utiliser un tube inséré à l'intérieur du rouleau aspirant et comprenant une zone perméable à l'air et une zone imperméable formant déflecteur, les moyens d'aspiration étant mis en communication avec l'intérieur dudit tube.According to another characteristic of the invention, the suction is effective only in the active zone of the roll, that is to say in the passage area of the web on the roller where the sail needs to be maintained and guided to avoid its floating. It is defined by deflection means disposed within the roller. The deflection means may comprise two radial deflectors optionally with a variable angular spacing or an optionally arcuate bent deflector telescopically variable length. It is also possible to use a tube inserted inside the suction roll and comprising an air permeable zone and an impervious deflector zone, the suction means being placed in communication with the inside of said tube.

L'aspiration étant effectuée par les extrémités du rouleau, plusieurs solutions peuvent être mises en oeuvre pour homogénéiser l'aspiration sur toute la longueur du rouleau, par exemple des perforations de taille et de densité augmentant des extrémités vers la partie centrale du rouleau aspirant lui-même, ou de la zone perméable d'un tube déflecteur, ou par l'emploi d'une pièce de forme dont la section évolue sur la longueur du rouleau.Aspiration being performed by the ends of the roll, several solutions can be implemented to homogenize the suction along the entire length of the roll, for example perforations of size and density increasing ends towards the central part of the suction roll him same, or the permeable zone of a deflector tube, or by the use of a shaped part whose section evolves along the length of the roll.

On peut aussi avantageusement prévoir, des moyens pour créer une aspiration progressivement plus important dans une zone d'étendue angulaire choisie, par exemple à l'endroit où la force centrifuge est la plus grande. Ceci peut être réalisé également en modifiant les caractéristiques et la densités des perforations dans cette zone d'aspiration concentrée.It is also advantageous to provide means for creating progressively greater suction in a zone of selected angular extent, for example at the location where the centrifugal force is greatest. This can be achieved also by modifying the characteristics and densities of the perforations in this concentrated suction zone.

Le rouleau selon l'invention peut être fabriqué par exemple à partir d'une tôle que l'on perfore à l'aide de moyens appropriés, puis que l'on soude pour former le rouleau, ou par filage, usinage ou fonderie. Le matériau est choisi en fonction de l'application, par exemple un alliage léger d'aluminium auquel on fait subir ensuite un traitement de surface électrochimique pour le durcir, ou un matériau à base de fibres de carbone ou encore en acier.The roller according to the invention can be manufactured for example from a sheet which is perforated using appropriate means, then welded to form the roll, or by spinning, machining or foundry. The material is chosen according to the application, for example a light alloy of aluminum which is then subjected to an electrochemical surface treatment to harden it, or a material based on carbon fibers or steel.

Le rouleau aspirant selon l'invention peut être utilisé dans les applications connues de l'état de la technique décrites plus haut :

  • pour le transfert :
    • entre peigneur et tapis de sortie de carde,
    • avec retournement entre tapis perforés supérieur et inférieur notamment dans un étaleur/nappeur,
    • entre tapis de carde et rouleau de calandrage,
    • entre tapis de sortie de carde et tapis plein d'entrée d'étaleur-nappeur,
    • entre les tapis inférieur et supérieur d'une carde double peigneur,
  • comme rouleau aspirant :
    • de pliage dans un chariot mobile de sortie d'étaleur/nappeur,
    • de consolidation.
The suction roll according to the invention can be used in the known applications of the state of the art described above:
  • for the transfer:
    • between doffer and card exit mat,
    • with reversal between upper and lower perforated mats, in particular in a spreader / lapper,
    • between card mat and roll of calendering,
    • between card exit mats and full mats of lapper-spreader entry,
    • between the lower and upper carpets of a double doffer card,
  • as a suction roll:
    • folding in a movable exit carriage of spreader / lapper,
    • consolidation.

Comme application nouvelle, on peut mentionner le transfert avec retournement d'un voile de fibres textiles, nappe ou produits équivalents, d'un support d'arrivée mobile plein sur un support récepteur, notamment plein.As a new application, one can mention the transfer with turning of a web of textile fibers, web or equivalent products, a full mobile arrival support on a receiving medium, in particular full.

Plus précisément, on peut citer le changement de direction d'un voile, la position du rouleau aspirant (génératrice de la courbure perpendiculaire ou oblique par rapport à la direction d'arrivée du voile sur le premier tapis) et le sens d'avancée du tapis récepteur, définissant la direction prise ensuite par le voile repris par le tapis récepteur. Une des applications courantes peut être le changement de direction à 90° d'un voile sensiblement dans un même plan avec retournement du voile ou le retournement complet d'un voile dans un chariot mobile d'entrée d'étaleur-nappeur. La présente invention est particulièrement intéressante pour cette dernière application, car dans un chariot mobile d'entrée d'étaleur-nappeur, le voile est soumis non seulement à sa propre inertie due à sa vitesse de transport relative au chariot, mais également à une force centrifuge lors de son retournement, qui font que le voile a réellement besoin d'être contrôlé lors de son retournement. Dans ce type de machine, le retournement du voile dans le chariot d'entrée constitue donc l'un des moments critiques où le voile risque de se décoller et de se déformer, limitant la vitesse de l'étaleur (voir notamment le brevet EP 0 517 563 ). Grâce à un rouleau aspirant selon l'invention, le voile est correctement contrôlé lors de son retournement dans le chariot mobile d'entrée de l'étaleur-nappeur, ce qui permet d'augmenter la vitesse de déplacement en va-et-vient du chariot sans déformer le voile et donc d'augmenter la vitesse de production de nappe. Grâce à une meilleure qualité de voile, également parce qu'il n'a plus besoin d'être tendu voire étiré à l'entrée de l'étaleur-nappeur, on peut réduire le nombre de plis de la nappe et augmenter également la productivité. Ceci est particulièrement intéressant pour un voile condensé. En effet l'invention permet de napper le voile au taux de condensation adapté au respect du MD/CD (résistance sens machine/sens transversal) désiré tout en conservant la qualité de la nappe finale et en augmentant la productivité de l'installation. Par ailleurs, grâce à l'invention, on a pu constaté que le contrôle de voiles à base de fibres courtes et volatiles comme la viscose, était possible, permettant dans certains cas de tripler la production de l'étaleur-nappeur.More specifically, mention may be made of the change of direction of a web, the position of the suction roller (generatrix of the curvature perpendicular or oblique with respect to the direction of arrival of the web on the first belt) and the direction of advance of the receiving belt, defining the direction taken then by the sail taken up by the receiving belt. One of the common applications may be the 90 ° change of direction of a web substantially in the same plane with flipping of the sail or the complete reversal of a sail in a mobile spreader-entry input carriage. The present invention is particularly interesting for this latter application, because in a mobile spreader-entry sled, the web is subjected not only to its own inertia due to its transport speed relative to the carriage, but also to a force centrifugal during its reversal, which make the veil really needs to be controlled during its turnaround. In this type of machine, the reversal of the web in the input carriage is therefore one of the critical moments where the web may peel and deform, limiting the speed of the spreader (see in particular the EP 0 517 563 ). Thanks to a suction roller according to the invention, the veil is correctly controlled when it is turned over in the mobile entry carriage of the crosslapper, which makes it possible to increase the speed of movement back and forth of the trolley without deforming the veil and thus increasing the speed of tablecloth production. Thanks to a better sail quality, also because it no longer needs to be stretched or stretched at the entry of the spreader-lapper, it is possible to reduce the number of folds of the sheet and also to increase the productivity . This is particularly interesting for a condensed web. Indeed, the invention makes it possible to coat the web with the condensation rate adapted to respect the MD / CD (machine direction resistance / transverse direction) desired while maintaining the quality of the final web and increasing the productivity of the installation. Furthermore, thanks to the invention, it was found that the control of sails based on short and volatile fibers such as viscose, was possible, allowing in some cases to triple the production of the crosslapper.

Dans les cas extrêmes, on peut prévoir d'enfiler sur le rouleau aspirant selon l'invention, un tube en textile par exemple tricoté ou une tôle mince perforée, le rouleau apportant la structure mécanique portante.In extreme cases, it is possible to slip on the suction roll according to the invention, a textile tube for example knitted or perforated thin sheet, the roll bringing the supporting mechanical structure.

L'aspiration selon l'invention peut par ailleurs avoir un effet supplémentaire de consolidation sur le voile en provoquant le tassement voire l'entrelacement de fibres. Ainsi en sortie de l'étaleur-nappeur la nappe peut être moins épaisse que dans l'état de la technique, ce qui facilite l'entrée dans une machine suivante, par exemple dans une aiguilleteuse. La consolidation du voile a aussi pour effet très avantageux de diminuer la fréquence de nettoyage des machines puisque les fibres sont mieux tenues dans le voile ou la nappe et ne s'éparpillent pas dans la machine.The suction according to the invention may also have an additional effect of consolidation on the web by causing the packing or even the interlacing of fibers. Thus at the output of the crosslapper the web may be less thick than in the state of the art, which facilitates entry into a next machine, for example in a needling machine. The consolidation of the haze also has the very advantageous effect of reducing the frequency of cleaning machines since the fibers are better held in the web or the web and do not scatter in the machine.

La présente invention sera mieux comprise et d'autres avantages apparaîtront à la lumière de la description qui va suivre d'exemples de réalisation, description faite en référence aux dessins schématiques annexés sur lesquels :

  • la figure 1 est une vue partielle en coupe en élévation illustrant un étaleur-nappeur de l'état de la technique auquel on peut appliquer la présente invention ;
  • la figure 2 est une vue en coupe montrant un premier exemple de chariot mobile d'entrée d'étaleur-nappeur utilisant un rouleau aspirant selon de l'invention ;
  • les figures 3, 4 et 5 sont similaires à la figure 2 montrant chacunes une variante de réalisation du chariot;
  • la figure 6 est une vue en coupe d'un exemple de réalisation d'un rouleau aspirant cannelé selon l'invention ;
  • la figure 7 est une vue de détail agrandi de la figure 6 ;
  • la figure 8 est une vue partielle schématique en perspective du rouleau des figures 6 et 7 ;
  • la figure 9 est une vue en coupe longitudinale du rouleau des figures 6-8 avec un arrachement local montrant les moyens d'homogénéisation de l'aspiration ;
  • la figure 10 est une vue partielle du dessus d'une paroi cylindrique à perforations étagées selon un autre exemple de réalisation de l'invention ;
  • la figure 11 est une vue en coupe selon ligne XI-XI de la figure 10 illustrant une variante de forme pour les chambres de dépression ;
  • les figures 12 et 13 sont des vues en coupe schématique d'un rouleau aspirant selon l'invention illustrant chacune une variante de réalisation des moyens de déflection ;
  • la figure 14 est une vue en perspective illustrant un autre exemple d'application de l'invention dans lequel deux voiles sont superposés en entrée d'étaleur-nappeur ; et
  • la figure 15 est une vue de dessus illustrant un autre exemple d'application encore de l'invention dans lequel on fait effectuer un changement de direction à 90° à un voile avec retournement.
The present invention will be better understood and other advantages will appear in the light of the following description of embodiments, description made with reference to the attached schematic drawings in which:
  • the figure 1 is a partial sectional elevational view illustrating a crosslapper of the state of the art to which the present invention can be applied;
  • the figure 2 is a sectional view showing a first example of a spreader-lapper entry moving carriage using a suction roll according to the invention;
  • the figures 3 , 4 and 5 are similar to the figure 2 each showing an alternative embodiment of the carriage;
  • the figure 6 is a sectional view of an exemplary embodiment of a grooved suction roll according to the invention;
  • the figure 7 is an enlarged detail view of the figure 6 ;
  • the figure 8 is a partial schematic perspective view of the roll of Figures 6 and 7 ;
  • the figure 9 is a longitudinal sectional view of the roll of Figures 6-8 with local tearing showing the means of homogenization of the suction;
  • the figure 10 is a partial view of the top of a cylindrical wall with stepped perforations according to another embodiment of the invention;
  • the figure 11 is a sectional view along line XI-XI of the figure 10 illustrating a variant form for the depression chambers;
  • the Figures 12 and 13 are schematic sectional views of a suction roll according to the invention each illustrating an alternative embodiment of the deflection means;
  • the figure 14 is a perspective view illustrating another example of application of the invention in which two webs are superimposed at the input of crosslapper; and
  • the figure 15 is a view from above illustrating another example of application of the invention in which a change of direction at 90 ° is made to a flip-flop.

La figure 1 montre schématiquement et en partie un exemple d'étaleur-nappeur de l'état de la technique dans lequel intervient un transfert de voile entre deux tapis pleins. Le voile 1 arrive en continu sur un tapis plein d'arrivée sans fin 2, puis, dans un chariot d'entrée mobile en va-et-vient 3 où il effectue un demi-tour pour être repris ensuite par un tapis plein récepteur sans fin 4 amené en continu dans ledit chariot 3 avec une direction opposée à la direction d'arrivée du tapis plein 2. En sortie du chariot 3, le voile 1 est pincé entre les deux tapis pleins 2 et 4. Le voile 1, ainsi maintenu par pincement dans une zone P, est ensuite repris par un second chariot mobile dit de sortie 5, ayant pour fonction d'étaler le voile en va-et-vient sur un tablier 6 se déplaçant en continu perpendiculairement au déplacement du chariot de sortie 5 de manière à former une nappe constituée de plis décalés. Le chariot d'entrée 3 a pour fonction de rendre compatible, en faisant varier la longueur de la zone de pincement P, l'arrivée en continu du voile sur le premier tapis 2 avec le dévidage du voile à la sortie du chariot de sortie 5, le dévidage variant selon la position du chariot de sortie 5 et le sens contraire ou pas d'avancée du chariot 5 par rapport au sens d'avancée du voile sur le tapis 2. Sur la figure 1 est représenté un chariot mobile d'entrée 3 selon l'état de la technique, dans lequel le tapis plein 2 est guidé par deux rouleaux de guidage 7 et 8 portés par le chariot mobile 2 définissant un tronçon incliné 9 de manière que le voile 1 transporté par ce tapis effectue ensuite autour du deuxième rouleau 8 un virage qui soit inférieur à 180°. Dans le chariot d'entrée 2, le trajet du deuxième tapis plein 4 est pour sa part défini par quatre rouleaux de guidage 10, 11, 12 et 13 portés par le chariot d'entrée 2 et disposés de manière d'une part qu'une ligne de pincement 14 soit ménagée entre le rouleau de guidage 8 du premier tapis 2 autour duquel le voile 1 effectue son virage et l'un des rouleaux de guidage (11 sur la figure 1) du second tapis 4 et, d'autre part, que le second tapis 4 soit amené à proximité du rouleau 8 pour reprendre le voile 1 à sa sortie.The figure 1 shows schematically and in part an example of spreader-launcher of the state of the art in which there is a transfer of web between two solid mats. The veil 1 arrives continuously on a carpet full of endless arrival 2, then, in a movable entrance trolley back and forth 3 where it performs a half-turn to be taken again by a carpet full receiver without end 4 continuously fed into said carriage 3 with a direction opposite to the arrival direction of the solid carpet 2. At the output of the carriage 3, the web 1 is clamped between the two solid mats 2 and 4. The web 1, thus maintained by pinching in a zone P, is then taken up by a second mobile carriage called output 5, whose function is to spread the web back and forth on an apron 6 moving continuously perpendicular to the displacement of the output carriage 5 so as to form a web consisting of offset folds. The function of the input carriage 3 is to make the continuous arrival of the web on the first web 2 compatible with the unwinding of the web at the output of the exit trolley 5, by varying the length of the niping zone P. , unwinding varying according to the position of the output carriage 5 and the opposite direction or no advance of the carriage 5 relative to the advancing direction of the web on the carpet 2. On the figure 1 is represented a mobile entry carriage 3 according to the state of the art, in which the solid carpet 2 is guided by two guide rollers 7 and 8 carried by the mobile carriage 2 defining an inclined section 9 so that the web 1 carried by this carpet then performs around the second roller 8 a turn that is less than 180 °. In the input carriage 2, the path of the second solid carpet 4 is for its part defined by four guide rollers 10, 11, 12 and 13 carried by the input carriage 2 and arranged so that, on the one hand, a pinch line 14 is formed between the guide roller 8 of the first belt 2 around which the web 1 makes its turn and one of the guide rollers (11 on the figure 1 ) of the second belt 4 and, secondly, that the second belt 4 is brought near the roller 8 to resume the web 1 at its output.

Sur la figure 2, est représenté un dispositif de transfert entre deux tapis pleins appliqué à un chariot mobile d'entrée d'étaleur-nappeur pouvant remplacer le chariot 3 décrit ci-dessus (les mêmes références sont utilisées ci-après pour les éléments communs aux deux figures). Le premier tapis plein 2 effectue son retournement autour de trois rouleaux de guidage entraînés dans le même sens : un rouleau supérieur 20, un rouleau intermédiaire 21 et un rouleau inférieur 22. Le rouleau intermédiaire 21 est placé de manière à définir en coupe un virage en pointe pour le tapis 2 avec une portion inclinée 23 avant le rouleau 21 et une portion inclinée 24 après le rouleau 21. Le second tapis plein 4 est guidé pour sa part dans le chariot mobile 3 par trois rouleaux de guidage : le tapis est guidé en "S" autour d'un rouleau supérieur 41, puis autour d'un rouleau intermédiaire 42 entraîné en sens inverse, puis d'un rouleau inférieur 43 amenant le tapis 4 au niveau approprié par rapport au tapis plein 2 pour réaliser la zone de pincement P définie entre les deux chariots mobiles d'entrée et de sortie. Tous les rouleaux de guidage sont fixés au châssis du chariot et entraînés automatiquement en rotation avec le déplacement du tapis correspondant. Le dispositif de transfert comprend un rouleau aspirant 31 qui est fixé au châssis du chariot 3 et positionné devant la portion inclinée 24 à une distance minimale du tapis 2. Le diamètre du rouleau 31 et sa position sont aussi choisis de préférence afin que le transfert du voile 1 sur le pourtour du rouleau aspirant se fasse sensiblement tangentiellement et en minimisant la distance de vide d entre le rouleau intermédiaire 21 et le rouleau de transfert 31 et également pour que le transfert du voile du rouleau 31 se fasse ensuite au plus près dans le plan du second tapis plein 4. Dans l'exemple représenté, la rotation du rouleau aspirant 31 est assurée grâce à un couplage 44 avec le rouleau de guidage 42 du second tapis plein 4, ce dernier se trouvant grâce à la configuration en "S" entraîné dans le sens adéquate de rotation pour que le voile 1 et le tapis plein 4 arrivent dans le même sens après le retournement du voile et surtout avantageusement à la même vitesse. On peut noter aussi ici que grâce à cette configuration en "S" en vis-à-vis du retournement du voile, le tapis plein 4 peut faire barrage aux phénomènes de compression ou de dépression dus au déplacement du chariot ; cela peut être recommandé dans les cas extrêmes de vitesses.On the figure 2 , there is shown a transfer device between two solid mats applied to a movable plow-lapper inlet carriage that can replace the carriage 3 described above (the same references are used hereinafter for the elements common to the two figures) . The first solid carpet 2 reverses around three guide rollers driven in the same direction: an upper roll 20, an intermediate roll 21 and a lower roll 22. The intermediate roll 21 is placed so as to define a cross section in turn. point for the belt 2 with an inclined portion 23 before the roller 21 and an inclined portion 24 after the roller 21. The second solid carpet 4 is guided for its part in the movable carriage 3 by three guide rollers: the belt is guided in "S" around an upper roll 41, then around an intermediate roll 42 driven in the opposite direction, then a lower roll 43 bringing the belt 4 at the appropriate level relative to the solid carpet 2 to achieve the pinching zone P defined between the two mobile entry and exit carriages. All guide rollers are attached to the carriage frame and automatically rotated with the movement of the corresponding belt. The transfer device comprises a suction roll 31 which is fixed to the frame of the carriage 3 and positioned in front of the inclined portion 24 at a Minimum distance of the belt 2. The diameter of the roller 31 and its position are also preferably chosen so that the transfer of the web 1 around the periphery of the suction roller is substantially tangential and minimizing the empty distance d between the intermediate roller 21 and the transfer roller 31 and also that the transfer of the web of the roller 31 is then made closer in the plane of the second solid carpet 4. In the example shown, the rotation of the suction roller 31 is provided through a coupling 44 with the guide roller 42 of the second solid carpet 4, the latter being due to the configuration "S" driven in the appropriate direction of rotation so that the web 1 and the solid carpet 4 arrive in the same direction after the reversal of the sail and especially advantageously at the same speed. It may also be noted here that thanks to this "S" configuration vis-à-vis the flipping of the web, the solid carpet 4 can block the phenomena of compression or depression due to the displacement of the carriage; this can be recommended in extreme cases of speed.

Selon l'invention, la paroi cylindrique du rouleau 31 est perméable à l'air et reliée latéralement à une source d'aspiration contrôlée pour maintenir le voile lors de son retournement. Les moyens mis en oeuvre pour alimenter le rouleau aspirant 31 avec une aspiration mobile peuvent comprendre un ventilateur embarqué, ou un système de tuyaux flexible ou télescopiques reliés à un ventilateur fixe, ou encore une buse de raccordement reliée à un collecteur d'aspiration. De préférence, le raccordement aux moyens d'aspiration est effectué par chaque extrémité de rouleau. Des moyens de déflection schématisés par le déflecteur arqué 46 permettent de définir une zone d'aspiration effective dans la courbure effectuée par le voile. Les caractéristiques du rouleau aspirant selon l'invention sont décrites en détails plus loin en référence aux figures 6 à 9.According to the invention, the cylindrical wall of the roller 31 is permeable to air and laterally connected to a controlled suction source to maintain the veil during its overturning. The means used to feed the suction roller 31 with a mobile suction may comprise an on-board fan, or a flexible or telescopic pipe system connected to a fixed fan, or a connection nozzle connected to a suction manifold. Preferably, the connection to the suction means is effected by each end of the roll. Deflection means schematically represented by the arcuate deflector 46 make it possible to define an effective suction zone in the curvature effected by the web. The characteristics of the suction roll according to the invention are described in detail below with reference to Figures 6 to 9 .

La figure 3 montre une variante de réalisation selon laquelle, le voile 1 est transféré non pas directement sur le rouleau aspirant 31 mais sur un petit tapis perforé 50 sans fin monté autour du rouleau aspirant 31 et de deux rouleaux de guidage 51 et 52 disposés en regard de la portion de tapis plein inclinée 23 à proximité respectivement des rouleaux de guidage 21 et 22. Cette construction permet de limiter les zones de vide entre le rouleau aspirant 31 et le tapis 2 dans lesquelles le voile n'est pas contrôlé.The figure 3 shows an alternative embodiment according to which, the web 1 is transferred not directly to the suction roll 31 but on a small endless perforated belt 50 mounted around the suction roller 31 and two guide rollers 51 and 52 arranged opposite the portion of carpet full inclined 23 near respectively the guide rollers 21 and 22. This construction limits the vacuum zones between the suction roller 31 and the carpet 2 in which the web is not controlled.

La figure 4 montre une autre variante de réalisation encore dans laquelle on utilise une configuration en "S" pour le tapis plein 2 avec la disposition d'un rouleau de guidage supplémentaire 53 dans un plan en arrière des deux rouleaux de guidage 21 et 22, qui permet à ces deux rouleaux de guidage 21 et 22 d'être approchés au plus près du rouleau aspirant 31 et donc de réduire les espaces vides entre le tapis 2 et le rouleau 31. Sur cette figure 4, on a également représenté en variante une arrivée sensiblement droite du tapis 4 guidé dans le chariot mobile 3 par au moins un rouleau de guidage 54. On a également représenté en variante une arrivée droite du tapis 2 avec la suppression de la portion inclinée 23.The figure 4 shows yet another alternative embodiment in which an "S" configuration is used for the solid carpet 2 with the provision of an additional guide roller 53 in a plane behind the two guide rollers 21 and 22, which allows these two guide rollers 21 and 22 to be brought closer to the suction roller 31 and thus to reduce the empty spaces between the belt 2 and the roller 31. figure 4 alternatively, a substantially straight inlet of the conveyor belt 4 guided in the movable carriage 3 by at least one guide roller 54 is alternatively represented. Alternatively, a straight inlet of the conveyor belt 2 is obtained with the removal of the inclined portion 23.

La figure 5 montre une autre variante encore de réalisation de chariot d'entrée 3 d'étaleur-nappeur mettant en oeuvre un deuxième rouleau aspirant 60 selon l'invention placé au-dessus du voile 1, avant son retournement, entre le tapis 2 et le rouleau 31, pour contrôler en outre le voile dans la zone de vide correspondante située entre eux. Dans le chariot représenté, le tapis 2 est guidé autour d'un premier rouleau de guidage 61 et d'un second rouleau de guidage 62, entre lesquels est définie une portion de tapis inclinée 63 de sorte que le tapis 2 effectue un virage ensuite sur le rouleau 62 de retournement inférieur à 180°. Cette portion inclinée permet également un transfert sur une étendue angulaire plus grande d'aspiration du rouleau aspirant supérieur 60. Le transfert du rouleau aspirant 60 sur la rouleau de retournement 31 est effectué grâce au positionnement relatif des zones actives d'aspiration. Le tapis 4 est guidé en regard des rouleaux aspirants 60 et 31 autour de deux rouleaux de guidage supérieur 64 et inférieur 65 de manière à décrire un trajet en "S". De manière avantageuse, cette configuration permet de coupler le rouleau de guidage 64 et le rouleau aspirant 60 et le rouleau de guidage 65 et le rouleau aspirant 31 pour les entraîner conjointement. Cette configuration, avec le plan incliné 63, permet de placer les deux tapis 2 et 4 sensiblement au même niveau, ainsi que le haut du rouleau 63. Cela permet d'éviter la ventilation due au déplacement en va-et-vient du chariot.The figure 5 shows another variant of embodiment of the staple-lapper entry trolley 3 implementing a second suction roll 60 according to the invention placed above the web 1, before it is turned over, between the belt 2 and the roller 31 , to further control the web in the corresponding vacuum zone between them. In the carriage shown, the belt 2 is guided around a first guide roller 61 and a second guide roller 62, between which is defined an inclined belt portion 63 so that the belt 2 then turns on the roll 62 of turning less than 180 °. This inclined portion also allows a transfer over a greater angular extent of suction of the upper suction roll 60. The transfer of the suction roll 60 on the roll-up roller 31 is performed by the relative positioning of the active suction zones. The belt 4 is guided opposite the suction rollers 60 and 31 around two upper guide rollers 64 and lower 65 so as to describe an "S" path. Advantageously, this configuration makes it possible to couple the guide roller 64 and the suction roller 60 and the guide roller 65 and the suction roller 31 to drive them together. This configuration, with the inclined plane 63, allows to place the two mats 2 and 4 substantially at the same level, and the top of the roller 63. This avoids ventilation due to movement back and forth of the carriage.

Les figures 6 à 13 décrivent le rouleau aspirant selon l'invention.The Figures 6 to 13 describe the suction roll according to the invention.

Selon l'exemple de réalisation représenté sur les figures 6 à 9, un rouleau aspirant 100 selon l'invention est creux comportant une paroi cylindrique munie sur sa surface externe de cannelures 102 ici axiales s'étendant sur la longueur du rouleau et deux extrémités opposées 100A, 100B. Chaque cannelure 102 peut être définie par une crête 103 encadrée par deux fonds 104, chaque fond 104 étant rendu perméable à l'air grâce à des orifices d'aspiration 105 de forme et de densité adaptées selon les applications visées, la force d'aspiration étant fonction de la densité du voile ou produit équivalent au contact du rouleau aspirant. Pour réaliser l'aspiration, un tube axial perforé 106 est ménagé à l'intérieur du rouleau 100 dépassant de part et d'autre de ses extrémités 100A, 100B, les extrémités du tube 106 étant reliées de manière connue en soi à une source externe d'aspiration. Le rouleau 100 est adapté à être entraîné en rotation par rapport au tube 106 selon un axe A de rotation grâce à des roulements à bille appropriés R La zone d'aspiration effective (107 sur la figure 6), à l'entrée 109 de laquelle un voile de fibres 108 est pris en charge par le rouleau 100 et à la sortie 110 de laquelle le voile est relâché, est délimitée ici par deux déflecteurs radiaux 111A et 111B qui sont reliés au tube axial 106. Ces déflecteurs peuvent être avantageusement munis de moyens de réglage de leur écartement (illustrés par des flèches F) de manière à pouvoir régler l'étendue angulaire de la zone d'aspiration 107. Par ailleurs, le tube 106 est perforé du côté seulement de la zone d'aspiration 107.According to the exemplary embodiment shown on Figures 6 to 9 , a suction roller 100 according to the invention is hollow having a cylindrical wall provided on its outer surface with grooves 102 here axial extending over the length of the roller and two opposite ends 100A, 100B. Each groove 102 may be defined by a ridge 103 framed by two bottoms 104, each bottom 104 being made permeable to the air by means of suction orifices 105 of appropriate shape and density, depending on the intended applications, the suction force depending on the density of the web or equivalent product in contact with the suction roller. To carry out the suction, a perforated axial tube 106 is formed inside the roller 100 protruding on either side of its ends 100A, 100B, the ends of the tube 106 being connected in a manner known per se to an external source suction. The roller 100 is adapted to be rotated with respect to the tube 106 along an axis A of rotation by means of appropriate ball bearings R The effective suction zone (107 on the figure 6 ), at the inlet 109 of which a fiber web 108 is supported by the roll 100 and at the outlet 110 of which the web is released, is delimited here by two radial deflectors 111A and 111B which are connected to the axial tube 106. These deflectors may advantageously be provided with means for adjusting their spacing (illustrated by arrows F) so as to be able to adjust the angular extent of the suction zone 107. Moreover, the tube 106 is perforated on the side only. of the suction zone 107.

Comme on le voit mieux sur la figure 7, selon l'invention, les flans 110A, 110B en regard l'une de l'autre de cannelures voisines 102, s'écartent depuis le fond commun 104 vers l'extérieur du rouleau, de sorte que lorsque l'on met en dépression l'intérieur du rouleau, une chambre de dépression C se forme entre le fond 104 des cannelures et les deux crêtes voisines offrant une surface d'aspiration entre deux crêtes 103 élargie par rapport à la section de sortie de l'orifice 105 et déportée par rapport à celle-ci. La puissance d'aspiration est réglée, notamment en fonction de la vitesse de défilement du voile 108, de sorte que celui-ci soit maintenu et guidé sur les crêtes de cannelures 103 grâce à la chambre de dépression C. L'air présent dans le voile 108 est aspiré radialement le cas échéant à l'intérieur du rouleau par les orifices 105 (schématisé par les flèches F2). Grâce à la présence de la chambre de dépression C, les fibres du voile ne sont ainsi pas au contact des orifices 105 et risquent peu de venir les boucher. Une forme triangulaire en coupe des cannelures comme sur les figures 7 et 8 permet avantageusement d'augmenter encore la surface d'aspiration des chambres de dépression C et donc d'aspirer le voile sur pratiquement toute sa surface tout en conservant une bonne tenue mécanique pour le rouleau. Pour augmenter encore le glissement du voile guidé sur le rouleau aspirant selon l'invention, les crêtes 103 des cannelures sont avantageusement arrondies comme représenté aussi sur les figures 7 et 8. Par ailleurs, le fond 104 des cannelures est élargi par rapport aux crêtes 103 des cannelures pour pouvoir augmenter la taille des orifices 105 et ainsi la force d'aspiration.As we see better on the figure 7 , according to the invention, the blanks 110A, 110B facing each other of neighboring grooves 102, deviate from the common bottom 104 towards the outside of the roll, so that when one puts in depression inside the roll, a depression chamber C is formed between the bottom 104 of the grooves and the two ridges adjacent having a suction surface between two ridges 103 widened relative to the outlet section of the orifice 105 and offset relative thereto. The suction power is adjusted, in particular as a function of the running speed of the web 108, so that it is held and guided on the ridges 103 of the grooves 103 through the vacuum chamber C. The air present in the sail 108 is sucked radially where appropriate inside the roller through the orifices 105 (shown schematically by the arrows F2). Due to the presence of the vacuum chamber C, the fibers of the web are not in contact with the orifices 105 and are unlikely to come to block them. A triangular shape in section of the grooves as on the figures 7 and 8 advantageously makes it possible to further increase the suction surface of the vacuum chambers C and thus to suck up the veil over substantially its entire surface while maintaining a good mechanical strength for the roll. To further increase the sliding of the guided web on the suction roll according to the invention, the ridges 103 of the grooves are advantageously rounded as shown also on the figures 7 and 8 . Furthermore, the bottom 104 of the grooves is widened relative to the ridges 103 of the grooves to increase the size of the orifices 105 and thus the suction force.

Sur la figure 9, on a illustré par la portion en arraché, des moyens pour homogénéiser l'aspiration réalisée latéralement, constitués par des perforations du tube 106 progressivement agrandies (allongées) depuis les côtés du rouleau jusqu'au centre de celui-ci.On the figure 9 the means for homogenizing the suction made laterally, constituted by perforations of the tube 106 progressively enlarged (elongated) from the sides of the roll to the center thereof, have been illustrated by the torn portion.

Par ailleurs, pour certaines applications, comme le retournement d'un voile, on peut prévoir que sur la circonférence du rouleau dans la zone d'aspiration, il y ait une zone où l'aspiration est plus forte par exemple correspondant à l'endroit où la force centrifuge est la plus importante. Cette zone d'aspiration plus forte peut être obtenue avec des perforations dans cette zone de taille et/ou de densité plus grande, de préférence progressivement, par rapport au reste de la zone perméable.Furthermore, for certain applications, such as the reversal of a web, it can be provided that on the circumference of the roll in the suction zone, there is a zone where the suction is stronger, for example corresponding to the place where the centrifugal force is the most important. This stronger suction zone can be obtained with perforations in this zone of size and / or of greater density, preferably progressively, with respect to the remainder of the permeable zone.

Il va de soi que d'autres variantes de réalisation sont possibles, notamment en ce qui concerne la disposition des orifices 105 qui sont prévus alignés d'un fond cannelure 104 à un autre sur la figure 8, mais qui pourraient être aussi disposés en quinconce d'un fond de cannelure à un autre. La forme des orifices 105 peut également varier, soit de manière homogène sur la longueur du rouleau, soit inhomogène pour créer un effet d'aspiration recherché, tel qu'une homogénéisation ou une concentration. Par ailleurs, la section en coupe des cannelures peut être trapézoïdale, avec le petit côté du trapèze correspondant à la crête de cannelure, de manière à agrandir les surfaces d'appui du voile en cas de besoin.It goes without saying that other alternative embodiments are possible, particularly with regard to the arrangement of the orifices 105 which are provided aligned from one groove base 104 to another on the figure 8 but which could also be staggered from one flute bottom to another. The shape of the orifices 105 may also vary, either homogeneously along the length of the roll, or inhomogeneous to create a desired suction effect, such as homogenization or concentration. Furthermore, the cross-section of the flutes can be trapezoidal, with the short side of the trapezium corresponding to the flute ridge, so as to enlarge the support surfaces of the veil when necessary.

Pour une application du rouleau aspirant au retournement d'un voile dans un étaleur-nappeur, les valeurs suivantes peuvent être données à titre purement indicatif : un diamètre de rouleau de l'ordre d'une ou plusieurs centaines de mm et une profondeur et un pas de cannelure de l'ordre de quelques mm.For an application of the suction roll to the reversal of a web in a crosslapper, the following values may be given for information only: a roll diameter of the order of one or several hundred mm and a depth and no groove of the order of a few mm.

Sur les figures 10 et 11, on a schématisé un second mode de réalisation de la paroi cylindrique perforée selon l'invention. A la place de cannelures, des perforations 200 circulaires et à deux étages sont ménagées dans la paroi cylindrique, comportant un étage inférieur constitué par un orifice d'aspiration 205 débouchant dans un étage supérieur de dimensions plus grandes que l'orifice 205 formant la chambre de dépression C. Des zones d'appui 203 pour un voile sont ainsi ménagées sur la surface de la paroi entre les perforations 200, lesdites zones d'appui étant plus ou moins grandes selon l'écartement des perforations. La forme de la chambre de dépression C peut être conique ou sensiblement parallélépipédique comme représenté sur la figure 11, avec un orifice d'aspiration dans son fond.On the Figures 10 and 11 a second embodiment of the perforated cylindrical wall according to the invention has been schematized. Instead of splines, circular and two-stage perforations 200 are formed in the cylindrical wall, comprising a lower stage consisting of a suction orifice 205 opening into an upper stage of dimensions greater than the orifice 205 forming the chamber. C. Support zones 203 for a web are thus formed on the surface of the wall between the perforations 200, said support zones being larger or smaller depending on the spacing of the perforations. The shape of the vacuum chamber C may be conical or substantially parallelepipedic as shown in FIG. figure 11 , with a suction port in its bottom.

Sur les figures 12 et 13, on a représenté deux variantes de réalisation des moyens de déflection. Sur la figure 12, il s'agit d'un déflecteur arqué 115 en deux parties 115A, 115B dont les portions terminales sont superposables télescopiquement pour pouvoir régler l'étendue angulaire de déflection. Cette conception a pour avantage de permettre un réglage de l'angle de prise en charge du voile par le rouleau aspirant et ainsi de couvrir plusieurs configurations de montage avec la même conception de rouleau. Par exemple, un même rouleau aspirant ainsi réglable peut être employé pour transférer un voile entre une carde et un nappeur quelque soit l'angle formé entre le tapis entrant et le tapis sortant. Sur la figure 13, il s'agit d'un tube 116 inséré à l'intérieur du rouleau aspirant 100 et comportant une zone de paroi arquée 116A perméable à l'air et une zone arquée de déflection 116B présentant un rayon de courbure plus grand que celui de la zone de paroi perméable 116A pour boucher les orifices d'aspiration 105 du rouleau, les deux zones 116A et 116B étant reliées par des parois radiales 117 et 118. On créé ainsi une pré-chambre de dépression 119 homogène entre le déflecteur 116A et le rouleau 100. Le déflecteur 116A assure alors une fonction de diffuseur de façon à homogénéiser la dépression dans cette pré-chambre sur toute la longueur du rouleau aspirant.On the Figures 12 and 13 two embodiments of the deflection means are shown. On the figure 12 it is a two-part 115 bent deflector 115A, 115B whose end portions are telescopically stackable to adjust the angular extent of deflection. This design has the advantage of allowing adjustment of the angle of coverage of the web by the suction roll and thus cover several mounting configurations with the same roller design. For example, the same adjustable suction roller may be used to transfer a web between a card and a lapper at any angle between the incoming carpet and the carpet coming out. On the figure 13 it is a tube 116 inserted inside the suction roll 100 and having an air permeable arcuate zone 116A and an arcuate deflection zone 116B having a greater radius of curvature than that of the permeable wall zone 116A for plugging the suction orifices 105 of the roll, the two zones 116A and 116B being connected by radial walls 117 and 118. This creates a homogeneous vacuum pre-chamber 119 between the baffle 116A and the roller 100. The deflector 116A then performs a diffuser function so as to homogenize the depression in the pre-chamber over the entire length of the suction roll.

La figure 14 illustre une autre application possible de transfert de voile utilisant un rouleau aspirant selon l'invention. Dans cette application, le dispositif de transfert sert à déposer un second voile 80 sur un premier voile 81 à l'entrée d'un étaleur-nappeur afin de former en sortie une nappe à double voile. Le premier voile est amené sur un premier tapis plein 82. Le second voile est amené sur un second tapis plein 83 déplacé selon la même direction que le tapis 82 mais dans un plan situé au dessus. Pour être amené à la bonne hauteur au-dessus du tapis 82, le tapis 83 est guidé sur une portion inclinée 86 définie entre deux rouleaux de guidage supérieurs 87 et 88 et un rouleau de guidage inférieur 89 situé dans un plan plus proche du tapis 82 et autour duquel le tapis 83 effectue un retournement pour repartir en sens inverse. Le transfert contrôlé du voile sur le tapis 82 s'effectue grâce à un rouleau aspirant 90 selon l'invention, placé au dessus du voile 80 de manière que ce dernier soit maintenu par aspiration avant d'être déposé sur le voile 81.The figure 14 illustrates another possible application of sail transfer using a suction roll according to the invention. In this application, the transfer device serves to deposit a second web 80 on a first web 81 at the entrance of a crosslapper in order to form a double-web web at the outlet. The first web is brought to a first full carpet 82. The second web is brought to a second full carpet 83 moved in the same direction as the carpet 82 but in a plane above. To be brought to the correct height above the belt 82, the belt 83 is guided on an inclined portion 86 defined between two upper guide rolls 87 and 88 and a lower guide roller 89 located in a plane closer to the belt 82 and around which the carpet 83 reverses to start in the opposite direction. The controlled transfer of the veil on the belt 82 is performed by means of a suction roller 90 according to the invention, placed above the veil 80 so that the veil is maintained by suction before being deposited on the veil 81.

La figure 15 illustre une autre application possible selon l'invention. Dans cette application, le rouleau aspirant sert à effectuer un retournement de voile pour appliquer un changement de direction à 90° au voile sensiblement dans un même plan. Un voile 91 arrive sur un premier tapis plein 92 qui effectue un demi-tour à l'aide d'un rouleau de guidage oblique 93. Un rouleau aspirant 94 selon l'invention est placé à proximité du rouleau 93 pour reprendre le voile 91. Ce dernier est alors pris en charge par le rouleau aspirant 94, suit une courbure correspondant à un retournement pour se retrouver sensiblement dans le même plan, la position du rouleau aspirant 94 définissant la direction dans lequel le voile 91 repart sur le second tapis plein de transport 95.The figure 15 illustrates another possible application according to the invention. In this application, the suction roller is used to effect a reversal of the sail to apply a change of direction at 90 ° to the web substantially in the same plane. A web 91 arrives on a first solid carpet 92 which performs a half-turn using an oblique guide roller 93. A suction roller 94 according to the invention is placed near the roller 93 to take the web 91. The latter is then supported by the suction roller 94, follows a curvature corresponding to a turnaround to be substantially in the same plane, the position of the suction roller 94 defining the direction in which the sail 91 leaves on the second carpet full of transport 95.

Claims (25)

  1. A suction roller (100; 31; 60; 90; 94) for processing a textile fiber web (108; 1; 80; 91) or an equivalent product, possibly denser or thicker as a fleece, a band etc., said roller being hollow and connected to a suction source and offering a cylindrical wall fitted with suction orifices, characterized in that said suction orifices (105, 205) open into at least one depression chamber (C) formed in the cylindrical wall between web support zones (103, 203).
  2. Roller according to claim 1, characterized in that the depression chamber (C) has a conical shape.
  3. Roller according to claim 1, characterized in that the suction orifices (105) are arranged in the bottom (104) of splines (102), the depression chamber (C) being created between the bottom (104) of each spline (102) and its two neighbouring crests (103), the spline crests forming the web support zones.
  4. Roller according to claim 3, characterized in that the splines (102) have a substantially triangular sectional profile.
  5. Roller according to claim 3 or 4, characterized in that the crest (103) of the splines (102) is rounded.
  6. Roller according to claim 5, characterized in that the splines (102) have a trapezoidal sectional profile, the small side of the trapezoid corresponding to the spline crest (103).
  7. Roller according to any of the previous claims, characterized in that the bottom (104) of the splines is widened in comparison to the crests (103).
  8. Roller according to any of claims 3 to 7, characterized in that the suction orifices (105) are offset in staggered rows between two neighbouring splines.
  9. Roller according to any of claims 3 to 8, characterized in that the splines (102) are circumferential, perpendicular to the revolution axis of the roller.
  10. Roller according to any of claims 3 to 8, characterized in that the splines (102) are axial, parallel to the revolution axis of the roller.
  11. Roller according to any of claims 3 to 8, characterized in that the splines (102) are helical.
  12. Roller according to any of claims 3 to 8, characterized in that the splines (102) follow two opposite helix.
  13. Roller according to claim 12, characterized in that the helixes join each other substantially in the central part of the roller.
  14. Roller according to any of the previous claims, characterized by a suction zone (107) defined by deflection means (111A; 111B; 116B; 115; 46) arranged inside the roller.
  15. Roller according to the previous claim, characterized by control means of the angular extent of the suction zone.
  16. Roller according to claim 14 or 15, characterized by suction concentration means so as to create a gradually higher suction in a zone of angular extent of the suction zone.
  17. Roller according to claim 16, characterized in that the zone of angular extent substantially corresponds to the place where the centrifugal force is the greatest.
  18. Roller according to one of claims 14 to 17, characterized in that the deflection means includes two radial deflectors (111A; 111B).
  19. Roller according to claim 18, characterized in that the control means of the angular extent of the suction zone includes control means of the angular spacing between the two radial deflectors.
  20. Roller according to one of claims 14 to 17, characterized in that the deflection means includes an arcuate deflector (115; 116B).
  21. Roller according to claim 20, characterized in that the arcuate deflector (115) has a telescopically variable arc-length.
  22. Roller according to one of claims 14 to 17, characterized in that the deflection means includes a pipe (116) arranged inside the roller (100) and including a zone (116A) permeable to the air and a zone (116B) forming a deflector, the suction means being set in communication with the inside of said pipe.
  23. Roller according to claim 22, characterized in that the suction occurs substantially along the axis of the roller through the roller ends, the zone (116A) permeable to the air of the pipe is constituted of perforations whose size and/or density varies gradually so as to create an homogenous suction on the whole length of the permeable zone.
  24. Roller according to claim 22 or 23, characterized in that the zone (116A) permeable to the air has a smaller radius of curvature than the radius of curvature of the zone (116B) forming a deflector, in order to create a pre-chamber of homogenization between the cylindrical wall of the roller and the permeable zone (116A).
  25. Roller according to one of claims 22 to 24, characterized in that the means to create a gradually higher suction in a portion of angular extent of the suction zone includes perforations having in said portion a -preferably gradually- increased size and/or density, as compared to the rest of the permeable zone.
EP03291165A 2002-05-28 2003-05-20 Suction roller for processing a sheet of textile fibres or an equivalent product Expired - Lifetime EP1367165B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0206468A FR2840325B1 (en) 2002-05-28 2002-05-28 SUCTION ROLLER FOR THE TREATMENT OF A TEXTILE FIBER SHEET OR EQUIVALENT PRODUCT
FR0206468 2002-05-28

Publications (2)

Publication Number Publication Date
EP1367165A1 EP1367165A1 (en) 2003-12-03
EP1367165B1 true EP1367165B1 (en) 2009-08-26

Family

ID=29415126

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Application Number Title Priority Date Filing Date
EP03291165A Expired - Lifetime EP1367165B1 (en) 2002-05-28 2003-05-20 Suction roller for processing a sheet of textile fibres or an equivalent product

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EP (1) EP1367165B1 (en)
AT (1) ATE440988T1 (en)
DE (1) DE60328942D1 (en)
FR (1) FR2840325B1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100815990B1 (en) 2006-12-18 2008-03-24 이규환 Rotary vacuum suction roller for broad cloth processing
EP3168337B1 (en) * 2015-11-10 2018-03-28 Oskar Dilo Maschinenfabrik KG Device for guided transport of a fibre web
JP2022002893A (en) * 2020-06-23 2022-01-11 ザ・ボーイング・カンパニーThe Boeing Company Automated removal apparatus, system, and method for selectively removing trimmed portion of laminated ply in ply-by-ply fabrication process
CN114435665B (en) * 2021-12-31 2024-03-12 山东宏业纺织股份有限公司 Integrative processingequipment of comb and parallel cotton fibers prior to spinning packing
CN115990570B (en) * 2023-03-16 2023-08-04 宁德时代新能源科技股份有限公司 Air-float roller and pole piece coating device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3616007A (en) * 1969-02-28 1971-10-26 Kimberly Clark Co Method for controlling and transferring crosslaid sheets
DE3710407A1 (en) * 1987-03-28 1988-10-13 Hollingsworth Gmbh DEVICE FOR STRENGTHENING A TEXTILE FLEECE AND THE LIKE
FR2732042B1 (en) * 1995-03-22 1997-06-13 Thibeau & Cie Sa A SUCTION CYLINDER ALLOWS THE TRANSFER OF A FIBROUS VEIL BETWEEN A CONVEYOR BELT AND TWO CALENDER CYLINDERS

Also Published As

Publication number Publication date
FR2840325A1 (en) 2003-12-05
FR2840325B1 (en) 2004-07-30
DE60328942D1 (en) 2009-10-08
EP1367165A1 (en) 2003-12-03
ATE440988T1 (en) 2009-09-15

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