WO1996009426A1 - Dispositif de distribution de liquide par jets sur une nappe fibreuse - Google Patents

Dispositif de distribution de liquide par jets sur une nappe fibreuse Download PDF

Info

Publication number
WO1996009426A1
WO1996009426A1 PCT/GB1995/002138 GB9502138W WO9609426A1 WO 1996009426 A1 WO1996009426 A1 WO 1996009426A1 GB 9502138 W GB9502138 W GB 9502138W WO 9609426 A1 WO9609426 A1 WO 9609426A1
Authority
WO
WIPO (PCT)
Prior art keywords
manifold
jet
strip
jet strip
perforated plate
Prior art date
Application number
PCT/GB1995/002138
Other languages
English (en)
Inventor
Robert Michael Deeming
Original Assignee
Courtaulds Engineering Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB9418833A external-priority patent/GB9418833D0/en
Priority claimed from GBGB9509249.0A external-priority patent/GB9509249D0/en
Application filed by Courtaulds Engineering Limited filed Critical Courtaulds Engineering Limited
Priority to GB9704269A priority Critical patent/GB2306521B/en
Publication of WO1996009426A1 publication Critical patent/WO1996009426A1/fr

Links

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
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/26—Perforating by non-mechanical means, e.g. by fluid jet

Definitions

  • This invention relates to a jetting apparatus for delivering high velocity liquid jets onto a fibrous web for entanglement of the fibres.
  • the invention also relates to an elongate jet strip for use in such a jetting apparatus.
  • Hydraulic entangling methods generally comprise passing a layer of fibrous material on a suitable support surface under high pressure liquid jets supplied from a row or rows of orifices in a jet manifold.
  • Known jetting apparatus as disclosed in US-A-3,403,862 includes a manifold body which receives high pressure liquid to which a jet strip is sealed by rows of bolts.
  • Such jetting arrangements have the disadvantage of requiring prolonged maintenance periods when the jets are to be changed or cleaned due to the large number of bolts to be undone and retightened, and the problems associated with obtaining equal sealing pressures along the jet strip.
  • EP-A-0,400,249 A further arrangement is disclosed in EP-A-0,400,249 in which a jet plate is clamped between a longitudinal jaw and a high pressure liquid manifold. The clamping is achieved by means of tie-bars which connect the jaws to hydraulic jacks mounted on the top of the manifold. The jet plate is released simply by removing the clamp load applied by the jacks. Such an arrangement is highly complicated. Disclosure of Invention
  • the present invention provides a construction for a jetting apparatus in which the jet strip is clamped in its operational position for easy maintenance.
  • an elongate jet strip for a jetting apparatus which comprises a substantially flat longitudinally extending central portion flanked along each longitudinally extending edge by a turned-over edge margin.
  • each jet strip is increased by flanking the central portion on each side with a turned- over edge margin. This allows the jet strips to be inserted or withdrawn without danger of creasing or kinking.
  • both edge margins are turned-over to the same side of the strip.
  • a jetting apparatus for delivering high velocity liquid jets onto a fibrous web for entanglement of the fibres and which includes a manifold having a chamber for receiving pressurised liquid and a plurality of outlets for delivering the pressurised liquid to a jet strip according to said one aspect of the present invention, characterised in that an elongate perforated plate is located in the fluid flow path between the manifold and the jet strip so that liquid exiting the manifold passes through the perforated plate.
  • the perforated plate has a central elongate chamber which opens towards the jet strip so that the elongate chamber is in communication with the manifold chamber through orifices in the perforated plate.
  • jet strip and perforated plate extend for at least the full length of the manifold and the jet strip, perforated plate and manifold are clamped together with the plate and jet strip being removable and insertable longitudinally of the manifold when the manifold is in a non-clamped condition relative to the plate and strip.
  • the apparatus further comprises a body having a cavity with the manifold located in the cavity, the manifold being displaceable within the cavity to clamp the perforated plate and jet strip against the base of the cavity.
  • the apparatus may include a pair of elongate jaws which serves to clamp the jet strip and perforated plate to the manifold.
  • a jetting apparatus for delivering high velocity liquid jets onto a fibrous web for entanglement of the fibres and which comprises a body having a cavity with a manifold located therein, the manifold having a chamber for receiving liquid and a plurality of outlets for delivering the pressurised liquid to a jet strip located in the base of the cavity, characterised in that the manifold is displaceable within the cavity to clamp the jet strip against the base of the cavity.
  • the body extends longitudinally and has open end portions at each longitudinal end thereof through which the jet strip can be withdrawn and inserted when the manifold is in a raised, non-clamping condition.
  • the manifold is raised by resilient means biasing the manifold away from the jet strip.
  • the clamping load on the jet strip is preferably produced by hydraulic actuator means which displace the manifold so as to clamp the strip against the base of the cavity.
  • Figure 1 is a longitudinal sectional view through a first embodiment of jetting apparatus according to the invention
  • Figure 2 is a section on the line II-II of Figure 1,
  • FIG 3 is part cut away isometric view of the apparatus of Figure 1 and Figure 2,
  • Figure 4 is an enlarged section through a jet strip
  • Figure 5 is a cross-section through a second embodiment of jetting apparatus according to the invention.
  • Figure 6 is a longitudinal section through the apparatus shown in Figure 5.
  • a jetting head 10 for an entanglement process in which high velocity water jets are directed onto fibrous material to cause entanglement of the fibres to form a sheet of porous material.
  • Such processes are used in the manufacture of non- woven materials used in medical applications, cleaning, filtration, tea bags etc..
  • the present invention relates to the jetting head and parts thereof, and a more thorough description of the manufacture of non-woven fabrics using entanglement techniques can be found in US-A-3,485,706.
  • the jetting head 10 has an elongate hollow substantially rectangular cross-section body 11 having an internal cavity 12 and a typical length of from 3.5 to 4 metres.
  • the upper portion 13 of the body 11 may be separable from the rest of the body 11, being held in place by any suitable means, for example welding, screws, pins or the like.
  • the side and bottom of the body 11 is shown as an integral component, the base portion 14 of the body 11 may also be formed separately and be removably secured to the side portions of the body again by any suitable means such as welding, screws, pins or the like.
  • the base portion 14 of the body is provided with an elongate central slot 15 through which jets of liquid exit the head 10.
  • the longitudinal ends of the body 11 are closed by end plates 16 and 17.
  • the cavity 12 within the body 11 houses an elongate cylindrical manifold 18 having an internal chamber 19 for receiving jetting liquid, preferably water, at high pressure (in the order of 200-250 bar) .
  • the jetting liquid may be fed into one end of the manifold 18 with the other end of the manifold being sealed by a plug (not shown) .
  • a plurality of longitudinally spaced apart outlet orifices 21 are located in the lower portion of the manifold away from the ends thereof.
  • An elongate channel-shaped actuator body 22 is located on the upper surface of the manifold 18. This body 22 may be secured to the manifold 18 by any suitable means or, alternatively, may only be located in a recess 23 formed in the upper outer surface of the manifold 18.
  • the channel- shaped body 22 houses or provides a plurality of longitudinally spaced hydraulic cylinders 24 (extending vertically in Figures 1 and 2) having reciprocable pistons
  • cylinders 24 sealingly engaging internal walls of the cylinders 24.
  • the pistons 25 are upwardly displaceable to abut the upper portion 13 of the body 11.
  • the cylinders 24 are supplied with pressurised hydraulic fluid through a slot
  • a perforated distribution plate 27 which has a central elongate chamber 28 which opens downwardly towards a jet strip 29 at the bottom of the plate 27.
  • the chamber 28 is in communication with the chamber 19 by means of longitudinally spaced apart orifices 31 which perforate the distribution plate 27 and which are in registry and in alignment with the orifices 21 in the manifold 18.
  • the orifices 31 have a diameter larger than the transverse width of the chamber 28 to minimise turbulence in use of the apparatus.
  • the upper portion of the distribution plate 27 has a pair of transversely projecting longitudinally extending shoulders 32 which are accommodated in longitudinally extending grooves 33 in downwardly extending spaced apart lugs 34 on the manifold 18.
  • the lugs 34 locate the distribution plate 27 to the manifold 18.
  • the lower portion of the distribution plate 27 projects into a longitudinally extending recess 35 in the base portion 14 of the body 11.
  • the lower edge margins of the sides of the lower portion of the plate 27 are chamfered for accommodating the jet strip 29, and to facilitate entry into the recess 35.
  • the jet strip 29 is located in the bottom of the recess 35 and has a plurality of jets therein which align with the chamber 28 on one side and the slot 15 on the other side.
  • the jets may vary in diameter, typically from 80 to 200 microns, and are spaced at intervals of from 0.5 to 1.5 mm centres. In a typical jet strip, about 4 m long, there may be up to 7000 jets per longitudinal row and from one to four, preferably two, rows of jets.
  • the jet strip 29 is shown in Figure 4 and is conveniently formed from stainless steel and has a length of about 4 m and a thickness of from 1 to 2 mm.
  • the plate In order to stiffen the jet strip longitudinally, the plate is turned up at its edges and thus has a substantially flat central portion 41 flanked on each edge by an inclined or turned over edge margin 42.
  • the two edge margins 42 are inclined or turned over to the same side of the strip and help locate the jet strip 29 relative to the distribution plate 27.
  • the jets 40 are located in a longitudinal central portion 50 which is recessed in both the upper and lower surfaces of the strip 29 so as to protect the edges of the jets as the strips are slid into or out of position.
  • the manifold 18 is biased away from the jet strip 29 by compression springs 43 located on the base of the cavity 12 between the base portion 14 and the lugs 34.
  • the manifold 18, distribution plate 27, and jet strip 29 project through apertures 44 formed in the two end plates 16 and 17.
  • the apertures 44 are of such dimensions as to permit vertical displacement of the manifold, plate and strip.
  • the maximum vertical displacement is preferably in the order of from 3 to 4 mm.
  • hydraulic pressure typically of between from 450 to 500 bar is applied within the hydraulic cylinders 24 which causes the pistons 25 to move upwardly, with the reaction load pushing the manifold 18 downwardly against the biasing of the springs 43 causing the distribution plate 27 to press or clamp the jet strip 29 against the bottom of the cavity 12.
  • Pressurised water or other jetting liquid is then fed to the manifold 18 which passes through the orifices 21,31 and chamber 28 to the jet strip 29 and exits the jets in the jet strip at a high velocity.
  • the distribution plate 27 carries peripheral seals 45 and 46 to seal against the manifold 18 and jet strip 29, respectively.
  • the springs 43 push the manifold 18 upwards away from the jet strip 29.
  • the jet strip 29 and/or the distribution plate 27 can be removed longitudinally from the ends of the jetting head 10. If both the jet strip and the perforated distribution plate are removed and inserted as an assembly the jets strip is less liable to damage.
  • the jet strip 29 may be utilised either way up, that is with the turned over edge margins 42 either cooperating with the chamfered surfaces on the distribution plate or engaging some other locating surface on the base portion 14.
  • FIG. 5 and 6 there is shown a second jetting head 110, also in accordance with the present invention, and those components which are substantially identical to components disclosed with reference to Figures 1 to 4 have been assigned the same reference numerals.
  • the jetting head 110 has a manifold 18 with an internal chamber 19 for receiving the jetting liquid.
  • the chamber 19 has a plurality of orifices 21 passing through its lower sidewall through which liquid under pressure can exit from the chamber 19.
  • Cross-plates 112 and 111 are fixed to the top and bottom of the manifod 18 by, for example, welding, and vertical side plates 113 and 114, and end plates 115 are also fixed together, for example by welding.
  • the manifold 18 and plates 111-115 form a stationary body.
  • the upper surface 116 of the top cross-plate 112 has a recess 23 therein to receive an elongate actuator member 22 housing a plurality of hydraulic cylinders 24 with pistons 25 vertically reciprocable within the cylinders.
  • the actuator member 22 is encased within the stationary body. Hydraulic fluid is fed to the cylinders 24 by a conduit 117.
  • the lower surface 118 of the bottom cross-plate 111 and the manifold 18 is machined flat to receive a retainer plate 119 which has a longitudinally extending 'T' shaped slot 121 therein which accommodates a distribution plate 27 and a jet strip 29.
  • the distribution plate 27 and jet strip 29 extend longitudinally beyond one end of the manifold 18 and can be removed or inserted longitudinally of the slot 121.
  • the jet strip 29 has edge margins that are turned up substantially normal to the flat centre portion 41, but they could be turned over, for example, so as to be inclined as in Figure 4.
  • the distribution plate 27 and jet strip 29 are clamped in position against the manifold 18 by a pair of elongate clamping jaws 122 arranged on the retainer plate 119 to extend one along each edge portion of the jet strip 29 and distribution plate 27 assembly.
  • the elongate jaws are each connected by a plurality of pairs of tie bars 123 passing through the plates 119, 111, 113 on either side of the manifold 18, to respective cross-bars 124 which each seat against a respective piston 25.
  • the jaws 122 are biassed away from the bottom cross-plate 111 by resilient means, preferably coil springs 125 arranged concentrically with each tie bar and housed in accommodating recesses and holes in the plates 111, 119.
  • hydraulic pressure causes the pistons 25 to move upwardly pushing the cross-bar 124 upwards and therefore through the tie bars 123 causing the clamping jaws 122 to clamp the distributor plate 27 and jet strip 29 to the manifold.

Abstract

Bande (29) de forme allongée destinée à un dispositif (10, 110) de distribution de liquide par jets à grande vitesse dans une nappe fibreuse, comprenant une portion (41) centrale plate s'étendant longitudinalement, flanquée le long de chaque côté longitudinal d'une bordure (42) latérale repliée vers le haut. On utilise cette bande (41) dans un dispositif de distribution par jets, conjointement avec une plaque (27) perforée de répartition de ceux-ci.
PCT/GB1995/002138 1994-09-11 1995-09-11 Dispositif de distribution de liquide par jets sur une nappe fibreuse WO1996009426A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9704269A GB2306521B (en) 1994-09-11 1995-09-11 Apparatus for jetting liquid onto a fibrous web

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9418833A GB9418833D0 (en) 1994-09-11 1994-09-11 Apparatus for jetting liquid onto a fibrous web
GB9418833.1 1994-09-19
GB9509249.0 1995-05-05
GBGB9509249.0A GB9509249D0 (en) 1995-05-05 1995-05-05 Apparatus for jetting liquid onto a fibrous web

Publications (1)

Publication Number Publication Date
WO1996009426A1 true WO1996009426A1 (fr) 1996-03-28

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ID=26305649

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/002138 WO1996009426A1 (fr) 1994-09-11 1995-09-11 Dispositif de distribution de liquide par jets sur une nappe fibreuse

Country Status (1)

Country Link
WO (1) WO1996009426A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2845934A1 (fr) * 2002-10-22 2004-04-23 Rieter Perfojet Dispositif de projection de jets a double obturation.
US7500294B2 (en) * 2004-10-07 2009-03-10 Fleissner Gmbh Water needling device
JP2011062691A (ja) * 2009-09-18 2011-03-31 Groz Beckert Kg 繊維加工機械用のノズル・バー

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3508308A (en) * 1962-07-06 1970-04-28 Du Pont Jet-treatment process for producing nonpatterned and line-entangled nonwoven fabrics
US3613999A (en) * 1970-04-29 1971-10-19 Du Pont Apparatus for jetting liquid onto fibrous material
GB2237824A (en) * 1989-11-09 1991-05-15 Honeycomb Systems Apparatus for jetting high velocity liquid streams onto fibrous materials
US5054349A (en) * 1989-03-21 1991-10-08 Andre Vuillaume Procedure and apparatus for perforating a product in sheets and perforated product obtained like this

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3508308A (en) * 1962-07-06 1970-04-28 Du Pont Jet-treatment process for producing nonpatterned and line-entangled nonwoven fabrics
US3613999A (en) * 1970-04-29 1971-10-19 Du Pont Apparatus for jetting liquid onto fibrous material
US5054349A (en) * 1989-03-21 1991-10-08 Andre Vuillaume Procedure and apparatus for perforating a product in sheets and perforated product obtained like this
GB2237824A (en) * 1989-11-09 1991-05-15 Honeycomb Systems Apparatus for jetting high velocity liquid streams onto fibrous materials

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2845934A1 (fr) * 2002-10-22 2004-04-23 Rieter Perfojet Dispositif de projection de jets a double obturation.
WO2004038079A1 (fr) * 2002-10-22 2004-05-06 Rieter Perfojet Dispositif de projection de jets a double obturation;
US7350724B2 (en) 2002-10-22 2008-04-01 Rieter Perfojet Double-seal jet spray device
CN100415973C (zh) * 2002-10-22 2008-09-03 立达公司 双重密封的射流喷射装置
US7500294B2 (en) * 2004-10-07 2009-03-10 Fleissner Gmbh Water needling device
JP2011062691A (ja) * 2009-09-18 2011-03-31 Groz Beckert Kg 繊維加工機械用のノズル・バー

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