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

Definitions

• the present invention relates to devices for spraying water jets, useful in particular for the hydraulic bonding of fibers in nonwovens but also of sheet material such as textile complexes, films, paper, fabrics and knitwear.
• This binding consists of sending a curtain of pressurized water jets onto a sheet of fibers, to entangle them and form them into a coherent sheet, without requiring the use of a binder.
• the injectors used today and which in practice can be produced in accordance with the teachings of FIG. 3 of the international patent application PCT / FR00 / 01398 and corresponding passages of the description of this document.
• the injectors consist of a body making it possible to resist the stresses exerted by the pressure of the water, at the upper part of which is produced an interior chamber generally of cylindrical shape supplied with water under pressure by a piping and a pump.
• a cartridge constituted for example by a perforated sheet metal tube covered in its internal part by a metallic fabric in stainless steel and ensuring the function of filtering medium.
• a perforated plate of micro-perforations is applied to the lower part of the body, the diameter of which can be between 50 and 500 microns and preferably between 100 and 200 microns, making it possible to form jets or needles of water.
• the distribution of water from the chamber of the body to the perforated plate can be achieved by means of cylindrical and then conical bores supplemented by a lower distribution chamber as described in FIG. 1 of the international PCT application / Froo / 0139.
• the distribution of water from the chamber of the body to the perforated plate can also be carried out by means of a narrow channel extending over the entire length of the body as described in FIG. 3 of the application.
• PCT / FR00 / 0139 This second technical solution is clearly superior to the first in terms of homogeneity of the water flow, and particularly at high pressures. corresponding to high water velocities.
• This second solution nevertheless has the disadvantage of requiring a large amount of material in the body above the chamber to obtain the mechanical strength of the body when the latter is subjected to the pressure of water.
• the effort on the main block being all the more important as the channel between the chamber and the perforated plate is long.
• the invention relates to a device for projecting water jets, which makes it possible to obtain a regular distribution of the water, without however requiring a large amount of material in the body.
• the device for regularly projecting water jets comprises a body resistant to pressure and delimiting an interior chamber having an inlet mouth and means for placing the chamber in communication, with passage through a plate having at least one row of perforations, with an outlet opening, these means comprising, formed in the body, holes with a circular outlet cross-section, emerging from the chamber in a channel adjacent to the plate and the largest dimension of which is perpendicular to the axis Holes.
• the dimension of the channel is less than the diameter of the straight section of the outlet of the holes, this width representing in particular from 10 to 90 % of the diameter.
• the holes are, from their ends remote from the interior chamber, therefore close to the channel, split over a part of their length, in particular over 10 to 50% of their length, along generatrices being substantially in a plane defined by the axis of the hole and the largest dimension of the channel.
• This arrangement further regulates the speed of the jets along at least one row of perforations.
• the speed of the water is roughly the same from one perforation to another, we remove the vortices that are created otherwise in the channel in the intervals between two holes.
• the joint plane of the two sub-parts is parallel to the surface of cooperation of the jaw with the main part of the body, so that the two sub-parts and the jaw can be fixed by fixing screws common to the jaw and to the two sub-parts.
• the channel is formed in an insert, interposed between the outlet of the holes, which are now called the first holes, and the perforated plate and having, facing the walls of the body defining the first holes, walls which define second holes respectively opposite the first holes, the ends of the second holes remote from the interior chamber opening into the channel which is delimited by walls of the insert and which is common to all the second holes .
• the insert is mounted by sliding it in an oblong housing, formed in the body and the largest dimension of which is parallel to the axis of the interior chamber. This insert is provided, on its faces facing the jaw and the main part, with annular seals.
• the circular cross-section holes are preferably cylindrical, but they can also be conical, or even elliptical.
• the diameter of the holes is usually between 3 and 25 mm and the pitch of the holes, namely the distance between the axes of two holes, is usually between 4 and 30 mm.
• the depth of the holes is usually between 5 and 100 mm.
• the diameter of the second holes corresponds to that of the first holes and the pitch of the second holes corresponds to the pitch of the first holes.
• the depth of the second holes is usually between 1 and 50 mm.
• the channel generally has a width of between 1 and 24 mm and its height is generally between
• FIG. 1 is a sectional view of the preferred embodiment of the water jet projection device according to the invention
• Figure 2 is a longitudinal sectional view along line II-
• the jet projection device which is shown, comprises a body parallelepiped having two large faces 2, 3 opposite, two small faces 4, 5 opposite and two opposite faces 6 opposite.
• the body 1 is made of steel.
• an oblong cylindrical chamber 7 with an axis 8, which goes from one front face 6 to the other.
• connections constituting an inlet communicating with a source of pressurized water which is not shown.
• a cylindrical filter 9 of the same shape as the chamber 7 but of smaller diameter.
• the face of the body 5 consists of a jaw 10, which is screwed to the rest of the body 1 by screws 11.
• first holes 12 On a generator of chamber 7, extend first holes 12, cylindrical 6 mm in diameter, separated from each other by solid parts 13 which make it possible to define these first holes 12. These first holes have a depth of 10 mm. The axis of the holes is directed perpendicular to the faces 4 and 5.
• An oblong piece 14 (fig. 3), made of metal or plastic, is mounted in a housing, defined between the jaw 10 and the main part 6 of the body, with interposition of O-rings 15 and 16 O-ring seals, between the faces of the part 14 which are opposite the faces of the jaw 10 and the main part 6.
• second holes 18 are formed as there are first holes 12.
• the holes 18 have the same diameter and the same depth as the holes 12 and are respectively opposite these. All of the holes 18 open into a common channel 19 defined by internal walls of the part 14. The largest dimension of this channel 19 is parallel to the axis 8.
• the channel 19 has a width of 3 mm.
• the channel 19 rises through slots 20 in the holes 18 to a depth or length of 5 mm, while the holes 18 have a depth of 20 mm.
• the channel 19 opens out above a perforated plate 21 whose perforations have a diameter of 120 microns.
• the perforated plate is slidably mounted in the jaw 10 by means of an annular O-ring seal 22.
• the jaw 10 defines in the face 5 an outlet 23.
• the jets leaving the device according to the invention clear, without white area, regardless of the position of the jet along the device.
• a very homogeneous nonwoven web is obtained, in a hydraulic binding installation, which comprises a device for projecting water jets whose jets are directed towards the lateral surface of a cylinder over which passes a tablecloth to bind.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Nonwoven Fabrics (AREA)
• Nozzles (AREA)
• Treatment Of Fiber Materials (AREA)
• Artificial Filaments (AREA)
• Pretreatment Of Seeds And Plants (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=27676073

Family Applications (1)

Country Status (7)

Families Citing this family (10)

Family Cites Families (3)

• 2002
  • 2002-02-26 FR FR0202404A patent/FR2836401B1/fr not_active Expired - Fee Related
• 2003
  • 2003-02-18 AU AU2003224202A patent/AU2003224202A1/en not_active Abandoned
  • 2003-02-18 WO PCT/FR2003/000520 patent/WO2003072261A1/fr active IP Right Grant
  • 2003-02-18 DK DK03720622T patent/DK1480755T3/da active
  • 2003-02-18 AT AT03720622T patent/ATE333944T1/de not_active IP Right Cessation
  • 2003-02-18 EP EP03720622A patent/EP1480755B1/de not_active Expired - Lifetime
  • 2003-02-18 DE DE60307058T patent/DE60307058T2/de not_active Expired - Lifetime

Non-Patent Citations (1)

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