EP0325722A2 - Verfahren zur Herstellung eines Filamentvlieses und Vorrichtung zum Ausführen des Verfahrens - Google Patents

Verfahren zur Herstellung eines Filamentvlieses und Vorrichtung zum Ausführen des Verfahrens Download PDF

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Publication number
EP0325722A2
EP0325722A2 EP88119470A EP88119470A EP0325722A2 EP 0325722 A2 EP0325722 A2 EP 0325722A2 EP 88119470 A EP88119470 A EP 88119470A EP 88119470 A EP88119470 A EP 88119470A EP 0325722 A2 EP0325722 A2 EP 0325722A2
Authority
EP
European Patent Office
Prior art keywords
filaments
bundles
conveyor belt
hereinbefore
spinning
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP88119470A
Other languages
English (en)
French (fr)
Other versions
EP0325722B1 (de
EP0325722A3 (en
Inventor
John Stoia
Roberto Meroni
Fabio Lancerotto
Umberto Gerin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NON WOVENS TECHNOLOGY SpA
Original Assignee
NON WOVENS ENGINEERING Srl
NON WOVENS ENGINEERING Srl
NON WOVENS TECHNOLOGY SpA
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
Application filed by NON WOVENS ENGINEERING Srl, NON WOVENS ENGINEERING Srl, NON WOVENS TECHNOLOGY SpA filed Critical NON WOVENS ENGINEERING Srl
Priority to AT88119470T priority Critical patent/ATE93904T1/de
Publication of EP0325722A2 publication Critical patent/EP0325722A2/de
Publication of EP0325722A3 publication Critical patent/EP0325722A3/en
Application granted granted Critical
Publication of EP0325722B1 publication Critical patent/EP0325722B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/16—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 thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion

Definitions

  • This invention concerns a method to form non-woven fabrics.
  • the invention concerns a method suitable to treat polymer granules so as to produce a plurality of manmade filaments, which are deposited in a uniform and ordered manner on a movable conveyor belt so as to form the non-woven fabric.
  • the invention concerns also a plant which employs the above method.
  • the method according to the invention provides for polymer granules to be taken automatically from storage containers and delivered to a silo.
  • the silo feeds an extruder unit in which the polymer granules are compressed and brought to a molten condition.
  • the present applicant has found advantageous a pressure in the range of 70 to 100 atmospheres and a temperature in the range of 280°C to 310°C.
  • the material While in the molten condition, the material is sent to and distributed among a plurality of spinning units, each of which comprises a spinneret.
  • Suitable pump means arrange to extrude the material through the holes of each spinneret, thereby obtaining a set of filaments descending freely in a vertical line.
  • the filaments coming from each spinneret are introduced into an ejector unit positioned below the relative spinneret and fed with air circulating downwards from above.
  • the number of ejector units is the same as the number of spinning units.
  • the filaments in the ejector units are drafted by aerodynamic action and are drawn downwards until they leave the ejector units.
  • the applicant has found by trials that drafting in the range of 200% to 300% is advantageous.
  • the filaments which have left their respective ejector units and have been drawn farther downwards by the flow of air flowing from the ejector units cooperate with a distributor means capable of oscillating in a direction crosswise to the axis of the filaments.
  • This distributor means provides for the orderly depositing of the filaments cooperating with it on a horizontal conveyor belt below the distributor means.
  • the conveyor belt which is driven at a suitable speed coordinated with the spinning speed, is positioned at an angle to the line of depositing of the plurality of the filaments on the conveyor belt.
  • the combined action of the oscillatory motion of the distributor means and of the motion of forward movement of the conveyor belt obtains depositing of the filaments in successive layers on the conveyor belt as each layer tends to be superimposed on the neighbouring layer in the direction of movement of the conveyor belt.
  • Contiguous layers are deposited at the same time across the conveyor belt in a number the same as the number of spinning units comprised in the plant or working in the plant.
  • Aspiration means to fix the material on the surface of the conveyor belt while the material is still in the deposition phase are included at the lower surface of the conveyor belt.
  • the material thus deposited has a fibrous structure with isotropic characteristics. Thereafter the material with the fibrous structure has to be thermoset and then calendered and wound on appropriate supports.
  • the invention is also embodied with a plant according to the characterization of Claim 9.
  • the attached figure which is given as a non-restrictive example, shows a diagram of a plant to produce non-woven fabrics which employs the method according to the invention.
  • a polymer brought to a molten state in an extruder connected to a feeder silo enters at 11 a spinning assembly 12 of a plant 10 that spins and forms non-woven fabrics.
  • the spinning assembly 12 consists of spinning units of a rectangular type positioned parallel to each other; the number of the spinning units is coordinated with the width of the non-woven fabric to be produced.
  • Each spinning unit comprises a distribution head, a false spinneret and a spinneret, the latter being provided with a row of holes arranged lengthwise in it.
  • the molten polymer is fed to the spinneret by a metering pump and is forced through the holes thus arranged lengthwise, thus forming a plurality of parallel filaments descending freely towards the lower part of the plant 10.
  • Each spinning unit is advantageously a modular unit which can be installed in or removed from the spinning assembly 12.
  • the filaments are cooled below the spinning assembly 12 in a cooling assembly 13 in which the temperature and volume of cold air are controlled continuously.
  • the cooling assembly consists of a set of parallel diffusers connected to a cold-air generation system and to an assembly of ducts 14 to convey the air, the diffusers being positioned between the rows of holes in the spinnerets of the spinning units.
  • a drafting assembly 15 consisting of ejectors 16, which are positioned parallel in a number the same as that of the spinnerets of the spinning assembly 12.
  • the ejectors 16 have an intake of a length, in the lengthwise direction, coordinated with the length of the corresponding spinnerets.
  • Each ejector 16 of the drafting assembly 15 consists advantageously of two parallel metallic walls extending vertically so as to form a conduit holding the filaments of the respective spinneret.
  • the present applicant has found advantageous a distance between 800 cms. and 1200 cms. from the spinneret to the intake of the ejector 16.
  • the parallel metallic walls of the ejector 16 near its intake comprise a horizontal slit; each slit is connected to a duct 17 communicating with a manifold conveying air under pressure, the manifold being connected in turn to suitable means for the production of compressed air.
  • the horizontal slit in the walls constitutes in itself the throttled passage of a Venturi tube, and therefore the air under pressure entering through the slits into the interior of the metallic walls and flowing downwards produces the required drafting action on the filaments and at the same time causes the filaments to be conveyed towards the outlet of the ejectors 16.
  • the filaments leaving each ejector 16 cooperate with a distributor means 18 capable of alternating motion on a horizontal plane.
  • the extent and frequency of the oscillation of the distributor means 18 can be adjusted as required.
  • the distributor means 18 consists substantially of a frame divided into segments, each segment in its inactive position being positioned in correspondence with the utlet of each ejector 16.
  • Each segment consists of two parallel guide surfaces suitable to contain and guide laterallly the filaments leaving each ejector 16.
  • the oscillatory movement of the distributor means 18 together with the action of the air leaving each ejector 16 and drawing with it the plurality of filaments produces an orderly, homogeneous distribution of the bundles of filaments on a conveyor belt 18 located below the distributor means 18.
  • the conveyor belt 19 consists of an endless belt 20, which is formed of a mesh having a pre-determined ratio of empty spaces to solid portions.
  • the conveyor belt 20 is driven advantageously by a speed change unit and cooperates with a suction box 21 having a width the same as that of the belt 20.
  • the non-woven fabric thus formed and anchored to the mesh of the belt 20 is taken by the latter to a subsequent thermosetting station.
  • the depositing of the layers of filaments on the conveyor belt 20 takes place, not orthogonally to the direction of advance of the belt 20, but according to a line suitably angled in relation to that direction of advance since the spinning assembly 12, cooling assembly 13, drafting assembly 15 and distributor means 18 are positioned in that manner in relation to the conveyor belt 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Artificial Filaments (AREA)
  • Woven Fabrics (AREA)
  • Paper (AREA)
EP88119470A 1987-12-01 1988-11-23 Verfahren zur Herstellung eines Filamentvlieses und Vorrichtung zum Ausführen des Verfahrens Expired - Lifetime EP0325722B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88119470T ATE93904T1 (de) 1987-12-01 1988-11-23 Verfahren zur herstellung eines filamentvlieses und vorrichtung zum ausfuehren des verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8350187 1987-12-01
IT83501/87A IT1220135B (it) 1987-12-01 1987-12-01 Procedimento di formazione di non tessuti e impianto adottante il procedimento

Publications (3)

Publication Number Publication Date
EP0325722A2 true EP0325722A2 (de) 1989-08-02
EP0325722A3 EP0325722A3 (en) 1990-01-10
EP0325722B1 EP0325722B1 (de) 1993-09-01

Family

ID=11322645

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88119470A Expired - Lifetime EP0325722B1 (de) 1987-12-01 1988-11-23 Verfahren zur Herstellung eines Filamentvlieses und Vorrichtung zum Ausführen des Verfahrens

Country Status (5)

Country Link
EP (1) EP0325722B1 (de)
AT (1) ATE93904T1 (de)
DE (1) DE3883741T2 (de)
ES (1) ES2042699T3 (de)
IT (1) IT1220135B (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD85849A (de) *
GB1089414A (en) * 1963-11-29 1967-11-01 Freudenberg Carl Improvements relating to the production of non-woven fabrics
CH456519A (de) * 1966-06-13 1968-07-31 Freudenberg Carl Fa Textiles Bodenbelagmaterial und Verfahren zu dessen Herstellung
DE1560805A1 (de) * 1966-06-10 1972-05-25 Lutravil Spinnvlies Textiler Bodenbelag und Verfahren zu dessen Herstellung
US4496508A (en) * 1981-12-24 1985-01-29 Firma Carl Freudenberg Method for manufacturing polypropylene spun-bonded fabrics with low draping coefficient

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD85849A (de) *
GB1089414A (en) * 1963-11-29 1967-11-01 Freudenberg Carl Improvements relating to the production of non-woven fabrics
DE1560805A1 (de) * 1966-06-10 1972-05-25 Lutravil Spinnvlies Textiler Bodenbelag und Verfahren zu dessen Herstellung
CH456519A (de) * 1966-06-13 1968-07-31 Freudenberg Carl Fa Textiles Bodenbelagmaterial und Verfahren zu dessen Herstellung
US4496508A (en) * 1981-12-24 1985-01-29 Firma Carl Freudenberg Method for manufacturing polypropylene spun-bonded fabrics with low draping coefficient

Also Published As

Publication number Publication date
DE3883741T2 (de) 1993-12-16
EP0325722B1 (de) 1993-09-01
DE3883741D1 (de) 1993-10-07
ES2042699T3 (es) 1993-12-16
EP0325722A3 (en) 1990-01-10
IT1220135B (it) 1990-06-06
ATE93904T1 (de) 1993-09-15
IT8783501A0 (it) 1987-12-01

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