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
  • D04H18/00—Needling machines
  • D04H18/04—Needling machines with water jets
• • 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
  • D04H1/40—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
  • D04H1/42—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 characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
  • D04H1/425—Cellulose series
• • 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
  • D04H1/46—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 by needling or like operations to cause entanglement of fibres
  • D04H1/498—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 by needling or like operations to cause entanglement of fibres entanglement of layered webs
• • 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
  • D04H13/00—Other non-woven 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
  • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
  • D04H3/10—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically
  • D04H3/11—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically by fluid jet
• • 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
  • D04H5/00—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length
  • D04H5/02—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length strengthened or consolidated by mechanical methods, e.g. needling
• • 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
  • D04H5/00—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length
  • D04H5/02—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length strengthened or consolidated by mechanical methods, e.g. needling
  • D04H5/03—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length strengthened or consolidated by mechanical methods, e.g. needling by fluid jet

Definitions

• the present invention relates to a novel method of forming webs, sheets, webs or ribbons by spraying fibers for the production of nonwovens.
• nonwovens there is already at least one method of forming sheets, webs or webs by spraying fibers.
• airlay dry-forming technique to defibrate, by means of a rotating drum provided with fine teeth, a continuously fed sheet of fibers, and to project these fibers against another rotating drum or carpet to form a web or a veil of fibers.
• This projection technique is for example marketed by the American company Rando under the brand Rando Webber.
• Other machines more advanced and also using the principle of fiber projection by a drum lined with fine teeth, such as the Turbo Card of the German company Spinnbau or Air Web of the French company Thibeau are also proposed.
• the new method of projection formation overcomes the disadvantages of known methods.
• the same machine is suitable for all types of fibers, nature3.1es, artificial or synthetic fibers and artificial or synthetic continuous filaments. It allows, in a single jet, to project at the same time fibers of very different length, having an average length ratio of long fibers compared to short fibers of 10 or even 15 and more.
• It is a universal jet spray method of forming web in terms of the type of fibers that can be used. It is also universal in terms of mass per square meter of sail or sheet formed, from less than 10 g / m2 to more than 500 g / m2, and this at high productivity, 300 kg / h and per meter of jet and more.
• the new training method first consists of dividing the process of forming a sheet, veil or sheet into two stages.
• an assembly of fibers and / or filaments is held together so that it can be defibrated by a jet of liquid on a first movable member through which fluid can pass.
• the first step is to form a regular and unconsolidated layer, without melting points, fibers, or even more layers of fibers superimposed by one or more known forming techniques.
• This can be for example one or more machines dry, wet or molten route, such as for example cards, cards followed by lappers, cards followed by lappers and stretchers, crates of paper-type head, crates head to foam, spunbond towers and any other known training device.
• the layer or layers of fibers deposited on the first movable element must be able to be defibrinated under the action of the jet. Tablecloths or leaves that have undergone strong consolidation should be avoided. Good results are obtained with webs or webs of fibers having a breaking length of less than 50 m. This is the free length for which the breaking of the sheet is obtained when it is subjected only to the action of its own weight.
• the EDANA ERT 20.2-89 standard gives an accurate method for calculating the breaking length from the value measured with a dynamometer of the tensile strength of the sheet. However the use of a dynamometer is not always possible given the poor cohesion of some layers.
• the second step consists in defibrating with a jet of fluid, preferably a jet of water, the regular layer disposed on the first movable element, and at the same time as the defibering, in projecting with the same jet of fluid the fibers against a second movable element disposed opposite the first movable element at the injection zone of the fluid jet at a distance greater than the thickness of the web.
• the fibers are deposited on the surface of the second movable element in a regular layer.
• the invention also relates to a plant for producing a web based on fibers and / or filaments, comprising a first endless mobile element defining an interior space and through which fluid can pass, a jet projection device. of fluid on the first movable element in the direction of a second movable element characterized in that the distance of the first movable element, the point of projection of the jets thereon and counted perpendicular to the first element at this point,. the second movable element is greater than the thickness of the web, and the projection device is in the interior space.
• the first movable member is preferably a woven conveyor, permeable to air, water and gases. And the jet of fluid is injected through the first movable member.
• the first movable element is preferably a conveyor made of a synthetic or metallic fabric. It preferably has a permeability of between 100 and 1400 CFM, and preferably between 200 and 800 CFM. When it is a fabric, it consists of synthetic or metallic threads, 0.1 mm in diameter and preferably between 0.10 and 0.6 mm in diameter.
• the fabric consists of 2 to 60 threads per cm in warp and weft direction, and preferably 10 to 40 threads per cm in warp and weft direction.
• the fabric may be a single layer fabric or multilayer. In multilayer fabrics, generally two or three layer fabrics are found.
• the first movable element may also be a thin metal or synthetic sheet mi ⁇ roperforée, supported or not by a rigid and permeable structure such as a rotary drum.
• a device for retaining a sheet of fibers for example by vacuum suction through a suction slot, is disposed in the interior space of the first movable element and immediately upstream of the fluid projection zone.
• the device for retaining the fiber web by vacuum suction disposed in the interior space of the first movable member and immediately upstream of the. projection zone of the fluid, preferably water jets, is extended downstream of the fluid projection zone by a complementary suction, including the fluid projection zone, the fluid jet constituting the only delimitation between the two suction areas.
• the suction zone downstream of the fluid projection zone no longer retains the fiber web, but only has the role of evacuating the water from the rebounds of the water jet on the first mobile element. In the absence of the downstream suction zone, the water from the rebounds disrupts the water jet and the homogeneity of the formed web suffers.
• the fiber retainer is disposed on the same side of the first movable member as the fluid jet projecting device.
• a fiber retaining device is disposed on the same side of the first movable element as the device for projecting the jet of fluid, preferably water jets, and at the same time Meanwhile, an aspirating device is disposed within the second movable member to suck up most of the water delivered to the web by the water spraying device. In the presence of suction inside the second movable element only bounces of the water jet can escape the suction.
• the fiber web retaining device may be made in a different manner, by mechanical means, in the form of a thin and flexible blade which plates the fibers against the first one. mobile element immediately upstream of the device for projecting the jet of fluid.
• a preferred way is to use the two devices for retaining the ply, by vacuum and by mechanical means to better press the ply of fibers against the first movable element and immediately upstream of the jet of the fluid jet device. , in order to better defibrate it.
• the blade which may be metal, stainless steel, nickel or plastic, is fixed directly to the frame in the vicinity of the point of projection of the water jet.
• a mechanical compression device of the fiber web is disposed upstream of the jet point of the jet of fluid.
• the device for mechanically compressing the web comprises means for wetting the web, for example an injector delivering jets of water.
• the device for compressing and wetting the sheet is chosen from known devices and used for the production of non-woven fabrics consolidated by jets of water, such as those proposed by the company Rieter Perfojet - France.
• the fluid jet can be homogeneous over the entire useful width, as for example in the case of a thin blade of water, but it can also be generated by one or more rows of close jets, such as cylindrical water jets from an injector such as those used in the technique of consolidating said jets of water and delivering 100 to 5000 jets per meter, diameter of 50 to 1000 microns and preferably between 80 and 400 microns.
• the water pressure is between 5 bars and 400 bars, and preferably between 10 bars and 250 bars.
• the jet of fluid may also consist of divergent water jets, such as jets from jet nozzles. In this case, the jets intersect to ensure the continuity of the jet over the width of the machine.
• the fluid jets or jets are preferably jets of liquid such as jets of water, it can also be jets of solvent, steam jets, jets of air or gas jets. It can also be a combination of different fluids.
• the shape and density of jets may also vary in the transverse direction of the machine number "jets, diameter and density of the jets, for example to form nonwovens exhibiting aspect bands and different structure in the machine senses.
• the second movable element may be of the same type as the first or different.
• This may for example be a rotating drum is covered with a metal or plastic fabric or covered with the micro-perforated sleeve and flat surface. It may be a drum presenting openings with or without a sub-canvas. It may also be a drum or carpet having geometric patterns in relief and / or hollow to produce patterned nonwovens or whose surface has areas of different shapes, relief and / or density.
• the second movable element may be a microperforated drum whose surface is bristling with reliefs making it possible to making nonwovens having apertures or perforations in the direction of the thickness.
• the first movable member is an endless belt consisting of a polyester yarn fabric
• the second movable member is a rotating drum covered with a micro-perforated nickel sleeve such as those employed by the Rieter Perfojet Company. for the production of nonwovens by entanglement of one water jets.
• a suction device is disposed behind the second movable element, at the level of the fiber receiving zone, for collecting and discharging the fluid from the jet of fluid that has projected the fibers onto the second element. mobile. The suction is carried out inside the drum and the evacuation of the fluid is done from behind. The fluid can be filtered and recycled.
• the speed of the second movable member may be greater than the speed of the first movable member.
• the mass per square meter of the nonwoven obtained will be less than that of the web or sheets superimposed on the first movable member.
• the speed of the second movable element may be less than the speed of the first movable element, in this case the mass per square meter of the nonwoven obtained will be greater than the mass per square meter of the fibers present on the first movable element.
• the speeds of the first and second movable elements may be identical.
• the optionally adjustable speed of the first and second movable element is between 1 and 2000 m / min.
• the ratio of the speed of the second movable element to the first movable element is between 0.01 and 100 and preferably between 0.1 and 10.
• the direction of movement of the fibers on the second movable element may be the same as on the first movable element or in the opposite direction.
• a displacement in the opposite direction allows a reorientation of the fibers particularly interesting when one wants to obtain a good reorientation of the fibers in the transverse direction, starting with preferentially oriented fibers in the machine direction.
• the movement of the fibers on the second movable member may be in a direction not parallel to the first movable member.
• the direction of movement of the second movable element may for example make an angle of 5 ° to 90 ° with the direction of movement of the first movable element.
• the second movable element of the first device becomes the first movable element of the second device and a new jet of fluid is injected through the second mobile element to project the fibers onto a third mobile element.
• the directions of movement may vary from the first to the second movable element, from the second to the third and so on.
• the directions of movement can also vary from one element to the next.
• the distance between the first movable element and the second movable element depends on the thickness of the fiber web present on the first movable element and the fluid used for the jet. It also depends on the power of the jet.
• the distance of the first moving element the second mobile element at the point of injection of the fluid is generally between 2 and 500 mm, and preferably between 5 and 200 mm and more preferably between 20 and 100 mm.
• the distance between the two movable elements is adjustable for example by a means of displacement of one relative to the other.
• this layer or layers of continuous filaments can be previously consolidated by spot melting or by other methods, it can also be simply compacted with little cohesion, or can be deposited without cohesion at all. filaments being totally free. It can also be a non-woven spunbond or a composite with meltblown that has been treated with water jets to soften or perforate before the projection of other components on its surface and in its thickness.
• the substrate can either be used as it is or undergo a complementary mechanical consolidation by jets of fluid, either by another mechanical process such as compression, needling, or by melting one of the components by spot or roller calendering, or by melting one of the components in a through-air oven, or else by the addition of chemical binders.
• This list of consolidation techniques is not limiting and all the consolidation techniques can be used either directly on the second mobile element or downstream thereof. It is also planned to perform finishing, coating, perforation, rolling with other non-woven after the formation of the non-woven and or consolidation.
• the first injectors are preferably installed facing the second mobile element supporting the fibers, that is to say on him.
• the jets have diameters between 80 and 200 microns and there are 500 to 5000 jets per meter of machine width.
• the water pressure is between 20 and 400 bars, and preferably between 30 bars and 250 bars. If necessary, it is also planned to carry out additional consolidation steps of the same type or different.
• the non-woven fabric may, for example, be dried in a through-air oven and then be hot-rolled to give it resistance or aesthetic reasons. The drying is carried out at temperatures preferably between 80 ° C. and 250 ° C.
• the invention finally relates to a nonwoven having long fibers or filaments and short fibers, the average ratio of the length of the long fibers. the short fibers being greater than 10, characterized in that there are both long fibers and short fibers at any location of the nonwoven.
• Figures 1 to 5 are diagrams of facilities according to the invention.
• a first movable element 1 is arranged facing a second movable element 2.
• a fluid ejection device 3 in a jet is disposed behind the first movable element 1.
• a suction device 4 is disposed behind the second movable element and facing the ejection zone of the fluid through the first movable element.
• the non-consolidated sheet of fibers or filaments 5 originating from a not shown forming machine advances on the first movable element 1 and the fibers 6 constituting the sheet 5 are projected onto the surface of the second movable element 2 in the zone d ejection of the fluid. A new ply of fibers 8 is thus formed.
• the double arrow F symbolizes the means for moving the two elements 1 and 2 relative to each other so as to modify the distance between the upper strand of the element 1 and the lower strand of the element 2, which are opposite.
• a ply of fibers 9 advances on a first movable element 10. It is first compressed by a compression device 11 with a conveyor. Then it is wetted by an injector 12 delivering streams of water 13.
• a device 14 consisting of a suction box terminated by a slot 15 holds the fibers of the sheet 9 immediately before the fluid ejection device 16.
• the fibers are projected by the jet of water 18 on the surface of a drum 19 covered with a microperforated sleeve such as those used in the consolidation of nonwovens by jets of water.
• a suction 20 disposed inside the drum 19 discharges a portion of the jet water.
• Two injectors 21 delivering jets of water consolidate the nonwoven 22 by the known technique of consolidation by jets of water.
• a suction roll 23 expresses a portion of the water contained in the nonwoven and then it is dried in a not shown through air oven.
• Description of Figure 3 The installation of Figure 1 is completed by the fact that it is provided on the upper run of the conveyor 2, which is permeable to a jet of water, a device 24 for jetting water jets which defibers the web 8 and projects the fibers 25, with the aid of a suction device 26 on a conveyor 27.
• the fibers form a new web 28.
• the web 8 advances from the right to the left while at the same location and downstream from it on the conveyor 27, the web 28 advances from the left. to the right.
• a ply of fibers 29 advances on a first movable element 30.
• a device 31 for retaining the ply on the first movable element holds the fibers of the ply 29 immediately upstream of the water jet projection device 32.
• the fibers are projected by the water jet 33 on the surface of a drum 34, covered with a micro-perforated sleeve such as those used in the consolidation of nonwovens by jets of water, in the form of a web 35.
• a suction 36 disposed inside the drum 34 discharges most of the water from the jet 33. Bounces 37 of the water jet which remain after the suction 36, are discharged by the additional suction 38 downstream of the fluid projection zone and which extends the suction 31.
• a ply of fibers 40 advances on a first movable element 41.
• a device 42 for retaining the ply on the first movable element holds the fibers of the ply 40 immediately upstream of the projection device. fluid 43.
• a thin and flexible blade 44 is used to press the fibers against the first movable element 41 immediately upstream of the Device 43.
• the fibers are projected by the jet of water 45 on the surface of a drum 46 in the form of a sheet of fibers 47.
• the suction 48 inside the drum 46 evacuates most of the water jet 45, except rebounds 49 of the water jet, are discharged by the additional suction 50 downstream of the water projection zone and extends the suction 42.
• the first movable member is made of 800 CFM polyester permeability polyester fabric having 22 yarns per cm in a 0.25 mm diameter warp direction and having 17.5 yarns per cm in a weft direction of diameter 0, 27 mm.
• a fiber holding device is disposed under the first movable member and consists of a suction slot of width 10 mm and having an adjustable depression of -10 mbar to -80 mbar.
• an injector delivers a single row of water jets.
• the jets have a diameter of 120 microns.
• the jets simultaneously defibrate and continuously project the fibers of the first movable element to the surface of a second movable element disposed facing the first movable element at the jet injection point which is also the point of projection of the fibers.
• the second movable element is a rotating drum covered with a microperforated sleeve with holes 300 microns in diameter and before 100 holes per cm 2 of surface.
• a vacuum of -80 mbar is applied inside the microperforated sleeve and 25 mm wide opposite the projection zone of the fibers of the first movable element.
• two water jet consolidation injectors Opposite the second mobile element are arranged after the receiving area of the projected fibers, two water jet consolidation injectors of the same type as those used for the consolidation of nonwovens by the so-called Spunlace technique. They deliver 1666 jets per meter. The jets have a diameter of 120 microns.
• Suction slots in which a vacuum of -80 mbar is applied are arranged facing each injector inside the rotary drum.
• Example 1 Two webs of a blend of 50% viscose fiber and 50% polyester fiber of 30 g / m 2 each were produced in-line at 166 m / min with two conventional card-type cards for nonwovens. three combers.
• the viscose fibers have a length of 40 mm and a pull of 1.7 dtex.
• the polyester fibers have a length of 38 mm and a title of 1.7 dtex.
• the two walls of 30 g / m2 are superimposed in a 60 g / m2 web and the web of 60 g / m2 is continuously deposited at the speed of 166 m / min on the first mobile element.
• the depression in the holding device is -30 mbar.
• the pressure in the projection injector is 30 bar.
• the second movable element has a speed of 250 m / min.
• the consolidation injectors on the second mobile element have pressures of respectively 60 bar and 100 bar.
• the nonwoven thus formed and consolidated is dried in a through air oven at a temperature of 130 ° C. It is uniform and resistant. It has a mass per square meter of 40 g / m2. It was produced at 250 m / min. It is a speed 50% higher than the maximum speed that these two same cards can reach with this mixture of fibers and a total basis weight of 40 g / m 2 or 20 g / m 2 per card.
• Example 1 is repeated. Two carded veils of 15 g / m 2 each are produced. With an airlaid type machine, a layer of wood fibers of 3 mm average length and 35 g / m2 is deposited between the two carded webs of 15 g / m2. The three superposed layers of fibers are deposited at a speed of 100 m / min on the first movable element. The depression of the holding device is -40 mbar. The formation jet has a pressure of 30 bar. The speed of the second moving element is 100 m / min. The pressure of the injectors facing the second movable element and respectively 40 bar and 70 bar. The nonwoven thus formed and consolidated is dried in a through air oven at a temperature of 150 ° C.
• Example 3 Example 2 is repeated with a speed of the second moving element of 160 m / min. The nonwoven is uniform and resistant. The wood fibers are mixed with the fibers of the carded veils. The nonwoven obtained has a mass per square meter of 39 g / m2.
• Example 4 Example 2 is repeated with a speed of the second movable element of 40 m / min. The nonwoven is uniform and resistant. The wood fibers are mixed with the fibers of the carded veils. The nonwoven obtained has a mass per square meter of 161 g / m2.
• Example 5 Example 5
• Example 2 is repeated replacing the upper carded web, that is to say the one above the wood fibers, with a web of 15 g / m 2 of 1.8 dtex continuous polypropylene filaments. a spunbond tower.
• the nonwoven obtained is uniform and resistant.
• the wood fibers were mixed with the fibers of the carded web as well as with the continuous filaments.
• the nonwoven obtained has a mass per square meter of 63 g / m2.
• Example 5 is repeated with a speed of the second movable element of 130 m / min.
• the non-woven is uniform and resistant.
• the nonwoven obtained is uniform and resistant.
• the wood fibers were mixed with the fibers of the carded fleece as well as with the continuous filaments.
• the nonwoven obtained has a mass per square meter of 48 g / m2.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Mechanical Engineering (AREA)
• Nonwoven Fabrics (AREA)
• Preliminary Treatment Of Fibers (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

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• 2007
  • 2007-01-19 FR FR0700363A patent/FR2911616B1/fr not_active Expired - Fee Related
• 2008
  • 2008-01-18 CN CNA2008800026362A patent/CN101589186A/zh active Pending
  • 2008-01-18 AT AT08761782T patent/ATE503050T1/de not_active IP Right Cessation
  • 2008-01-18 DE DE602008005713T patent/DE602008005713D1/de active Active
  • 2008-01-18 EP EP08761782A patent/EP2113041B1/de active Active
  • 2008-01-18 WO PCT/FR2008/000064 patent/WO2008107549A2/fr active Application Filing

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