Classifications

• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
  • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H11/00—Non-woven pile fabrics
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
  • D04H3/005—Synthetic yarns or filaments
  • D04H3/009—Condensation or reaction polymers
  • D04H3/011—Polyesters
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
  • Y10T428/24595—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness and varying density
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
  • Y10T428/2495—Thickness [relative or absolute]
  • Y10T428/24967—Absolute thicknesses specified
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
  • Y10T428/24992—Density or compression of components
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
  • Y10T442/608—Including strand or fiber material which is of specific structural definition
  • Y10T442/614—Strand or fiber material specified as having microdimensions [i.e., microfiber]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
  • Y10T442/637—Including strand or fiber material which is a monofilament composed of two or more polymeric materials in physically distinct relationship [e.g., sheath-core, side-by-side, islands-in-sea, fibrils-in-matrix, etc.] or composed of physical blend of chemically different polymeric materials or a physical blend of a polymeric material and a filler material
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
  • Y10T442/637—Including strand or fiber material which is a monofilament composed of two or more polymeric materials in physically distinct relationship [e.g., sheath-core, side-by-side, islands-in-sea, fibrils-in-matrix, etc.] or composed of physical blend of chemically different polymeric materials or a physical blend of a polymeric material and a filler material
  • Y10T442/641—Sheath-core multicomponent strand or fiber material
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
  • Y10T442/643—Including parallel strand or fiber material within the nonwoven fabric
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
  • Y10T442/659—Including an additional nonwoven fabric
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
  • Y10T442/659—Including an additional nonwoven fabric
  • Y10T442/66—Additional nonwoven fabric is a spun-bonded fabric
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
  • Y10T442/681—Spun-bonded nonwoven fabric

Definitions

• the present invention relates to nonwoven production machines, their adjustment methods and the nonwovens obtained using these machines.
• a machine for producing a nonwoven which comprises means for ejecting continuous filaments along a horizontal curtain in the grip of two rolls of horizontal axis which are rotated. The filaments are deposited in a sheet on the two rollers which define a passage which converges from the inlet to the outlet.
• a nonwoven comprising continuous filaments in which in a core part, the filaments are oriented for the most part of a filament, perpendicular to the surfaces of the nonwoven and the two lateral parts of which are oriented mainly for the most part of a filament parallel to the surfaces of the nonwoven (called Z-structure).
• a number of filaments extending both in the core and in the lateral parts, namely the upper part and the lower part.
• the machines in which the filaments are projected horizontally have entirely given way in the art to machines in which the filaments are ejected vertically and in particular to spunbond machines which give symmetrical nonwovens since the effect of gravity does not come to meets symmetry.
• These spunbond machines generally consist, successively from top to bottom, of an extruder for a molten organic polymer supplying a die making it possible to produce a curtain of continuous filaments, of a cooling zone making it possible to solidify at least one superficial part of the extruded filaments, of a suction device in which the curtain of filament is subjected to the action of high speed air streams causing the drawing of filaments and a means of deflection and slowing down of the air flow allowing the filaments to be distributed randomly on a conveyor.
• these spunbond machines do not make it possible to obtain products of the type that those obtained by the machine of the patent of the Federal Republic of Germany mentioned above.
• the invention relates to a nonwoven production machine making it possible in particular to obtain nonwovens of the type indicated above but by a machine in which the continuous filaments are ejected vertically, in particular in a spunbond machine, while preserving thus the possibility of easily obtaining symmetrical nonwovens and especially with the possibility of regulating in an unequaled way hitherto the functioning of the machine.
• the invention therefore relates to a machine for producing a nonwoven comprising means for ejecting continuous filaments on two surfaces, at least one of which is movable, for depositing the filaments ejected into a sheet, defining between they a passage which is convergent for the sheet by bringing it down from an inlet to an outlet and in which they entrain the sheet, characterized in that there are provided, at the outlet, means for deflecting the sheet in a direction other than vertical on a conveyor for taking up the web, the latter being only after the exit and up to the conveyor in contact with one conveyor. This preserves the Z structure of the sheet.
• the deflection means are such that at any point between the outlet and the subsequent fixing of the structure of the sheet, the deflected sheet is only in contact with a conveyor.
• the change of direction takes place at the exit, after the most converging point.
• the direction from entry to exit is descending and, preferably, vertical. While in the patent of the Federal Republic of Germany mentioned above, we were mainly concerned with the reception of the web at the outlet of the two rollers by ensuring that this web is presented horizontally thus being very easy to take back and support with a conveyor and thus adopting consequently a horizontal ejection of the curtain of filaments, the invention takes the opposite view of this technique.
• the difficulty of recovering a sheet which is not horizontal can be overcome much more easily than solving the problems due to gravity posed by a curtain of horizontal filaments.
• it is provided at the outlet of the means for deflecting the sheet in a direction other than vertical, in particular for deviating the sheet in the horizontal direction.
• the invention also relates to a method for adjusting a machine for producing a nonwoven in which a web of continuous filaments is deposited on a movable surface, there is a controlled quantity associated with the web and adjusts a regulating quantity of the machine as a function of the adjusted variable measured, characterized in that one makes so that the position of the start of the sheet can vary and the position of the start of the sheet is taken as the adjusted quantity.
• the sheet is made to have an initial descending section, in particular a vertical section, and the level at the beginning of the table is noted. There is thus a regulated quantity, which is associated directly with the sheet, the detection of which is not destructive and which above all is associated with the beginning of the sheet.
• reaction speed in the event of a malfunction of the production machine is thus very rapid, on the one hand because the adjusted quantity is associated with the sheet and is taken as soon as possible on this sheet and on the other hand because the detection of a position or a level can be carried out practically on the spot using very rapid optical devices.
• the invention also relates to a nonwoven comprising continuous filaments in which, in a portion of the core, the filaments are oriented, for the most part of a filament, perpendicular to the surfaces of the nonwoven and in the two lateral parts are oriented for the most part of a filament, parallel to the surfaces of the nonwoven, a certain number of filaments extending both in the core and in the lateral parts, in which part of the core, filaments are oriented for the most part, for the major part of a filament, perpendicular to the surfaces of the nonwoven and in two lateral parts are oriented for the most part a filament, parallel to the surfaces of the nonwoven, at least a certain number of the filaments extending both in the core and in the lateral parts, characterized in that a lateral part has an orientation of the filaments, a thickness and / or density different from that of the other lateral part.
• the two movable deposition surfaces can be provided by a first roller and by a second roller rotating in opposite directions and whose grip defines the passage.
• means are provided for adjusting the grip between the two rollers and / or the speed of rotation of the two rollers.
• By adjusting the grip between the two rollers it is possible to maintain a certain amount of filament upstream of the outlet or point of convergence of the passage and it is also thus possible to adjust the size of the loops of the filaments during their removal.
• By adjusting the speed of rotation of the rollers it is also possible to adjust the quantity of filaments present in the converging passage upstream of the outlet.
• Means may also be provided for synchronizing the variation in the speed of rotation of the rollers with the speed of a conveyor for taking up the sheet after the deflection means.
• the rollers may have a different diameter.
• two conveyors are provided which pass respectively over the rollers by converging in the right-of-way, these conveyors defining the converging passage and preferably being provided with means for adjusting the angle of convergence. This adjustment also makes it possible to adjust the quantity of filaments present in the passage upstream of the outlet. In both cases, suction is provided in the rollers.
• Each roller may consist of a central fixed part around which rotates a rigid air-permeable cylinder, itself covered with a sleeve or with a canvas.
• each roller has its own suction means.
• the dimension of the outlet of the passage, or maximum distance between the two rollers or the two conveyors which pass there, is preferably between 0.5 and 50 mm.
• the convergence angle is preferably between 20 and 120 °.
• the dimension of the passage entrance is preferably between 10 and 400 mm.
• the radius of the rollers is preferably between 50 and 500 mm.
• the means for deflecting the filaments are constituted by the fact that the first roller has a larger suction area than the second roller.
• a first compartment is provided in particular delimited inside the first roller by radial walls respectively at a position between 12 a.m. and 10 a.m. and a position between 8 a.m. and 5 a.m., preferably between 7 a.m. and 6 a.m. and by a second compartment inside the second roller delimited by radial walls respectively at a position between 12 h and 2 h and a position between 2 h and 4 h and by means A to create depressions in these two compartments .
• the first compartment is subdivided into two upper and lower sub-compartments each having their own suction means.
• the sheet formed in the passage is pressed on the first roller until it takes a direction most often horizontal and is supported by a conveyor as it is usual in the spunbond machines.
• a device for feeding an additional material into the filaments can be. a binder material and / or fibers, filaments and / or compound filaments comprising binder material. Binders can be injected into the filaments before and / or after the converging passage. Bicomponent filaments can also be produced directly by the spunbond tower, part of which is made up of a binder.
• the filaments can also be bicomposed only on the sides of the die so that they are mainly found then in the nonwoven on the lateral parts. You can also introduce the fibers into the spunbond tower in the form of meltblown or short fibers. It is also possible to deposit fibers on the surface of the sheet by means of an aeraulic deposition machine (airlaid). After leaving the passage and after the sheet has been deflected, it can be consolidated by a heating device when it contains binder, by a compression device, by consolidation by water jet or by consolidation by switching mechanical. It is also possible to provide a device for calibrating the sheet downstream of the passage. In the nonwovens obtained, preferably the density of the core is smaller than that of a lateral part, preferably at least 10%.
• the nonwoven preferably has a mass per m 2 of 50 to 2000 g / m 2 and preferably 200 to 1200 g / m 2 . It preferably has a thickness of 1 to 100 mm, the core having a thickness preferably representing more than 50% and preferably between 50% and 90% of the thickness of the nonwoven.
• the content of binder is smaller in the core than in the lateral parts.
• the filaments have a titer greater than 3 dtex.
• the invention finally relates to the use of a nonwoven comprising continuous filaments, in which in a core part, filaments are oriented in the majority, for the major part of a filament, perpendicular to the surfaces of the non -woven and in two lateral parts are oriented for the most part of a filament, parallel to the surfaces of the nonwoven, at least a certain number of filaments extending both in the core and in the parts lateral, as structural material, having in particular acoustic properties. Due to the roughly perpendicular alignment to the surface of the filaments in the core, the nonwoven withstands pressure well in the transverse direction. With binder and a fiber supply of less than 10 dtex, we even have an elastic behavior (foam).
• the filaments aligned horizontally and consolidated in the two lateral parts give good resistance to bending and prevent any penetration of sharp objects into the nonwoven.
• the nonwoven can be used with advantage for vehicles in the automotive, railway and aeronautical industries due to its good acoustic properties due to its thickness (> 10 mm) and its sufficient rigidity to be self-supporting. It can be used in particular as a roof and door panel for an automobile which absorbs sound well and which has a stable shape, by being coated on one or two of its faces with a decorative air permeable coating.
• the nonwoven can also be used as an envelope for household appliances, printers or reprographic devices. It can be used as insulating material for construction and building and also as cushioning layers of the floor and even of roads.
• the invention also relates to a material comprising the nonwoven fabric according to the invention coated with a nonwoven fabric obtained by meltblowing, preferably on only one of the surfaces.
• This new product has the following properties: - resilient - very good delamination - suitability for molding and thermoforming - AFR (Air Flow Resistance, Rt see WO 2004/088025) between (150-6000) Ns / m 3 - very good acoustic properties
• the meltblown process is a process by which a molten polymer is extruded in a hot gas vapor at high velocity, which converts it into fibers.
• the molten plastic is blown by hot gas at high velocity through the lips of the extruder die.
• the filaments coming out of the extruder are thinned during their formation until they crack.
• the fibers break into small pieces rather than being continuous, like those formed in spunbond nonwovens.
• FIG. 1 is a schematic sectional view of a machine according to the invention
• FIG. 2 is a view similar to FIG. 1 of a variant
• FIG. 3 is a schematic sectional view of a nonwoven according to the invention
• FIG. 4 is a partial schematic sectional view corresponding to FIG. 1 and illustrating the elements making it possible to adjust the operation
• FIG. 5 is an electronic diagram of the regulation circuit
• FIG. 6 is a partial perspective view illustrating another mode of regulation making it possible to obtain the nonwoven of FIG. 3.
• each roller consists of a fixed cylinder 8 surrounded by a breathable sleeve 9 with a radius of 250 mm.
• a breathable sleeve 9 with a radius of 250 mm.
• the cylinder 8 of the second roller is defined by walls 10, 11 radial a compartment 12. The walls extend over the entire length of the cylinder 8.
• the wall 10 is, as considered in cross section of the roller and as is seen in the figure, at the 1 o'clock position, while the wall 11 is at the 3 o'clock position.
• a suction schematized by the letter A creates a depression in the compartment 12.
• the first roller 6 on the right is also provided in the same way as in the second roller 7 on the left a chamber 13 delimited by a wall 14 at 11 o'clock and by a wall 15 to 6 hours.
• the rollers are rotated at the same speed in the direction of the arrows U and f 2 respectively .
• the sheet N formed by the compression exerted by the rollers 6 and 7 on the pile of filaments is deflected to the right to take a horizontal position and, being taken up by the upper strand of a conveyor 19 , passes on a heating device 20 on both sides, between two calibration rollers R then on a device 21 for meltblown deposition and on a device 22 for consolidation by water jet or hot calendering (70-90 ° C) . Also passes below the sheet N a functional layer C from a coil B.
• the machine of FIG. 2 differs from that of FIG. 1 in that the rollers 6, 7 serve as return rollers for conveyors 23 , 24 converging in the passage and provided with suction boxes 25.
• FIG. 4 illustrates in an embodiment according to FIG. 1 the adjustment of the level of the pile of filaments at the entrance to the passage converging between the rollers.
• a photoelectric cell 26 with multiple light beams detects the level of the pile of filaments in the passage.
• a radial wall 38 subdivides the first compartment into two sub-compartments 39 and 40 communicating respectively, via conduits 41, 42 with valves 43, 44 with the suction of vacuum pumps 45, 46.
• Figure 5 shows schematically the regulation circuit.
• the detector 26 sends level signals L (t) by a line 27 to a controller 28 which controls the speed T of rotation of the rollers as a function of the level signal and which consequently sends speed signals by lines 29-1 , 29-2 and 29-3 to amplifiers A1, A2, A3, which cause lines 30-1, 30-2 and 30-3 of the motors M1, M2, M3 for driving the rollers 6, 7 and the driving roller of the conveyor 19.
• the controller 28 also synchronizes the speed variation of the motors M1 and M2 to the variation of the speed of the motor M3 or vice versa.
• Figure 6 is a perspective view which shows the presence of a laser beam 31 for detecting the level of the pile of filaments, in the passage between the rollers.
• the signals obtained by this detector are used to control the rotational speeds of the rollers 6, 7 and / or the drive roller of the conveyor 19, the distance between the rollers 6, 7 and / or the inclination of the conveyors 23, 24
• this detector 31 it is possible to give the sheet characteristics, notably of thickness, different and to obtain a nonwoven shown in FIG. 3. It has a core 36, and lateral parts 32 , 37, the thickness of which is substantially the same all along the nonwoven.
• the filaments are directed essentially parallel to the surfaces of the nonwoven, while in the lateral parts 32, 37, they are essentially perpendicular to these large surfaces.
• the direction of the filaments is more perpendicular to the surfaces of the nonwoven in at least one of the lateral parts than in the core.
• the lateral part 32 is thicker than the lateral part 37 and / or less dense, and / or a different orientation of the filaments. This difference is obtained between the two lateral parts 32, 37 by tilting the conveyor 23 differently from the conveyor 24 and / or by giving the rollers 6,7 different diameters and / or different speeds.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Nonwoven Fabrics (AREA)
• Preliminary Treatment Of Fibers (AREA)
• Treatment Of Fiber Materials (AREA)
• Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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• 2003
  • 2003-11-27 FR FR0313918A patent/FR2862986B1/fr not_active Expired - Fee Related
• 2004
  • 2004-11-26 JP JP2006540544A patent/JP2007512448A/ja active Pending
  • 2004-11-26 EA EA200601048A patent/EA008838B1/ru not_active IP Right Cessation
  • 2004-11-26 WO PCT/FR2004/003040 patent/WO2005054558A2/fr active Application Filing
  • 2004-11-26 CN CN2004800352772A patent/CN1973074B/zh not_active Expired - Fee Related
  • 2004-11-26 BR BRPI0417009-1A patent/BRPI0417009A/pt not_active IP Right Cessation
  • 2004-11-26 US US10/580,793 patent/US7530147B2/en not_active Expired - Fee Related
  • 2004-11-26 EP EP04805568A patent/EP1716277A2/fr not_active Withdrawn
  • 2004-11-26 CA CA 2547526 patent/CA2547526A1/fr not_active Abandoned
• 2006
  • 2006-05-26 ZA ZA200604311A patent/ZA200604311B/xx unknown
• 2009
  • 2009-04-08 US US12/420,228 patent/US7935644B2/en not_active Expired - Fee Related

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