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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
  • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
  • B05B1/20—Arrangements of several outlets along elongated bodies, e.g. perforated pipes or troughs, e.g. spray booms; Outlet elements therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
  • B05B1/26—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets

Definitions

• the present invention relates to devices for jetting water jets, particularly useful for the hydraulic bonding of nonwoven fibers.
• This bonding consists in sending a curtain of pressurized water jets formed by a perforated wafer on a fiber web to entangle them and form them in a coherent web, without requiring the use of binder or resin.
• the minimum distance between jets from elsewhere difficult to obtain is slightly less than 0.5 mm.
• This manufacturing limit is due to mechanical reasons, since it must necessarily have a minimum of material between each perforation so that the wafer has a mechanical strength correct in time.
• the invention provides for this by a device for jetting water jets, easy to machine.
• the water spray device comprises a body defining a chamber and delimiting a longitudinal outlet on the outside, a single plate, in one piece and provided with perforations being interposed between the chamber and the outlet, being supported. by two longitudinal spans as described in WO 03/07038.
• the two longitudinal bearings are curved along a curved surface the same longitudinal generator, which turns its concavity towards the exit.
• the perforations are of revolution and their fictitious axis is normal to the curved surface. They are thus easy to machine.
• the cross-sectional curve of this curved surface is preferably a circle, but it may also be constituted by the strings of a portion of a regular polygon inscribed in a circle, the axes of the perforations passing through the middle of the strings. It is thus obtained that the jets of water converge at the center of the circle and the veil to be consolidated by the jets of water is preferably arranged so that the center of the circle is in the middle of the veil, the distance between the element carrying the veil
• T conveyor or drum, carrying the web and the point of the lower face of the wafer which is furthest away being generally between 10 mm and 50 mm, preferably between 20 mm and 40 mm.
• the curved surface may also have an elliptical or parabolic cross section.
• the perforations of the plate can to be staggered, the points of impact of the jets on the veil then succeeding on the same line in a very close manner.
• the perforations are aligned along lines perpendicular to longitudinal rows of perforations. Usually, there are 2 to 6 rows in this case. But there can also be a single row of perforations.
• the diameter of the perforations is generally between 50 microns and 250 microns and the distance between two adjacent perforations between 0.4 mm and 30 mm. Preferably the distance between each row of perforations is between 0.4 mm and 3 mm.
• the wafer generally has a thickness of between 0.5 mm and 5 mm, preferably between 0.6 mm and 1.4 mm.
• the longitudinal free edge of one of the spans is further from the chamber than the longitudinal free edge of the other span.
• the wafer is mounted in a position where it intersects the plane of sending the water defined by the passage putting the chamber in communication with the outlet, but where it is not symmetrical with respect to this plane.
• This arrival at an angle that can be between 70 and 90 degrees, on the sail reduces the bounces of the jets in them. orienting at best.
• This arrival is all the better that the width of the outlet is between 1 mm and 10 mm, preferably between 2 mm and 5 mm.
• the wafer is supported by a single wafer holder. , in one piece, the same curvature as the plate and open next to the exit.
• the wafer holder is placed in the jets of water jet device while it supports a wafer according to the invention, while, to put a wafer of the old type the wafer holder is removed and the wafer is supported by a conventional wafer holder accommodating a flat wafer.
• the longitudinal output device for sending water under pressure generally comprises a body and a jaw fixed to the body so as to retain the perforated plate sustained or not by a wafer holder.
• the longitudinal chamber preferably cylindrical, is machined in the body and is supplied with water compressed by one of the end faces.
• the longitudinal passage for sending water under pressure on the perforated plate extends over the entire longitudinal dimension of the body and opens into a distribution chamber defined by the jaw and in which the plate is supported, the jaw defining below. of the wafer the exit opening of the jets towards a veil conveying means, generally an endless perforated conveyor belt or a perforated drum.
• the median longitudinal plane of the outlet is inclined relative to the median longitudinal plane of the passage.
• the invention also relates to a consolidation installation of a nonwoven by water jets comprising a transport element (T) of the nonwoven in front of a jet projection device.
• the device is as in the invention and the smallest distance between the transport element and the point of the lower face of the wafer furthest from the transport element is between 10 mm and 50 mm.
• the invention finally relates to a perforated plate as defined above, the ratio of the length to the width is between 5 and 250, preferably between 20 and 200.
• the plate has in particular a length between 500 mm and 8000 mm, preferably between 500 mm and 6000 mm, and a width of between 5 mm and 50 mm, preferably between 10 mm and 25 mm.
• FIG. 1 is a sectional view of a wafer according to the invention
• FIG. 2 is a sectional view of a water jet device according to the invention comprising the plate of FIG. 1,
• FIG. 3 is a view similar to FIG. 2 while the wafer is supported by a wafer holder;
• FIG. 4 is an elevational view of a wafer according to the invention having three rows of perforation centered in a staggered manner,
• FIG. 5 is a side view corresponding to FIG. 4
• FIG. 6 is a view from above corresponding to FIGS. 4 and 5
• FIG. 7 is a perspective view corresponding to FIGS. 4 to 6;
• FIG. 8 is a schematic elevational view of a wafer according to the invention with three rows centered and aligned,
• FIG. 9 is a side view corresponding to FIG. 8;
• FIG. 10 is a plan view corresponding to FIGS. 8 and 9;
• FIG. 11 is a perspective view corresponding to FIGS. 8 to 10,
• FIG. 12 is a diagrammatic elevational view of a three-row angled plate centered in a staggered configuration
• FIG. 13 is a side view corresponding to FIG. 12,
• FIG. 14 is a view from above corresponding to FIG. 12 and 13,
• FIG. 15 is a perspective view corresponding to FIGS. 12 to 14,
• FIG. 16 is a sectional view of another embodiment of the device for projecting jets of water according to the invention.
• Figure 17 is a sectional view of another embodiment of the water spray device according to the invention.
• the one-piece plate shown in Figure 1 is substantially rectangular, but is precurved along a curved surface turning its concavity downward.
• the plate 1 made of stainless steel has two rows of perforations whose fictitious axes 2 are normal to the arc of the wafer 1 rotating its convexity upwards.
• the fictitious axes 2 illustrate the path of the jets of water converging at point A.
• the water jet projection device comprises a body 4 consisting of a body itself and a jaw 5 steel fixed below the body in a sealed manner.
• a cylindrical water supply chamber 6 at a pressure of 400 bar, the water supply source communicating with the chamber 6 by a front end of the body 4 which is above the plane of the blueprint.
• This single chamber 6 communicates by a single longitudinal passage 7 'extending throughout the longitudinal extent of the body, but closed on both end faces. This passage opens into a space defined by the two parts of the jaw at the bottom of which is the single plate 1 according to Figure 1. Between the two parts of the jaw 5 is defined below the plate an outlet 7 by which the jets 2 d water can come out of the water spray device.
• the jaw On either side of the outlet 7, the jaw defines two bearing surfaces 3 curved along a curved surface which turns its concavity towards the outlet 7.
• the two bearing surfaces 3 are defined by the same longitudinal generatrix. They face the room 6 and are on both sides of the passage 7 '.
• the device for projecting water jets shown in FIG. 3 differs from that shown in FIG. 2 in that the wafer 1 is flat, but is sufficiently flexible to bend under the effect of the pressure of the water. , so that it matches the curved shape of a single piece holder 8, in one piece, which, like the wafer 1, extends over the entire longitudinal dimension of the jets of water spray device .
• the upper face of this holder-plate 8 has a curved surface that the wafer 1 wife.
• each perforation of the middle row is disposed between two perforations of the left row.
• Each perforation of the right row is arranged between two perforations of the central row, but also between two perforations of the left row.
• the perforations are arranged in three rows, the perforations are aligned so they are not staggered and the middle row gives a stream arriving perpendicularly on the web 10.
• the three jets the same line of perforations, perpendicular to the rows, converge at the same point.
• the wafer is constituted by three ropes 11, 12, 13 of arcs of an imaginary circle 14 of center 15 located on the nonwoven.
• the perforations are perpendicular to the strings and their fictitious axis is perpendicular to the string 11, 12, 13.
• the perforations are arranged in staggered rows.
• the plate 16 is inclined relative to the median longitudinal plane X of the chamber 6 defined by the passage 7 'and the median longitudinal Y plane of the outlet 7 is inclined relative to the median longitudinal plane X of the passage 7'.
• the jets coming out of the wafer 16 arrive on the nonwoven web 10, supported by a rotating drum (T) in the direction of clockwise, as indicated by the arrow (F), downstream from where they would arrive if the wafer 16 was not inclined.
• the two parts of the jaw themselves each have an inclined bearing the wafer and define an opening under the wafer for the outlet 7 of the jets.
• the embodiment of the embodiment of FIG. 17 corresponds to that of FIG. 16, but this time the wafer 16 is supported by a wafer holder 17 itself having a curved or worn surface matching that of the wafer, while its surface 18 by which it rests on the jaw is a flat surface so that by replacing the wafer holder 17 by a usual wafer holder, it is also possible to operate the jet jetting device with a conventional flat wafer .

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Nonwoven Fabrics (AREA)
• Nozzles (AREA)
• Overhead Projectors And Projection Screens (AREA)
• Special Spraying Apparatus (AREA)
• Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=40792668

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (4)

Citations (7)

Family Cites Families (4)

• 2009
  • 2009-01-16 FR FR0900192A patent/FR2941158B1/fr not_active Expired - Fee Related
  • 2009-08-28 WO PCT/FR2009/001043 patent/WO2010081939A1/fr active Application Filing
  • 2009-08-28 EP EP13005660.9A patent/EP2712679B1/fr active Active
  • 2009-08-28 EP EP09737039.9A patent/EP2387470B1/fr active Active
  • 2009-08-28 CN CN200980154262.0A patent/CN102271820B/zh active Active
  • 2009-08-28 ES ES09737039.9T patent/ES2562347T3/es active Active

Patent Citations (7)

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