EP2119816B1 - Spinndüse mit zweilappigen Spinnöffnungen - Google Patents

Spinndüse mit zweilappigen Spinnöffnungen Download PDF

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Publication number
EP2119816B1
EP2119816B1 EP08008901A EP08008901A EP2119816B1 EP 2119816 B1 EP2119816 B1 EP 2119816B1 EP 08008901 A EP08008901 A EP 08008901A EP 08008901 A EP08008901 A EP 08008901A EP 2119816 B1 EP2119816 B1 EP 2119816B1
Authority
EP
European Patent Office
Prior art keywords
spinneret
bilobal
spinning
filaments
orifices
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.)
Active
Application number
EP08008901A
Other languages
English (en)
French (fr)
Other versions
EP2119816A1 (de
Inventor
Galliano Boscolo
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.)
Albis SpA
Original Assignee
Albis 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 Albis SpA filed Critical Albis SpA
Priority to PL08008901T priority Critical patent/PL2119816T3/pl
Priority to EP08008901A priority patent/EP2119816B1/de
Priority to AT08008901T priority patent/ATE494405T1/de
Priority to DE602008004316T priority patent/DE602008004316D1/de
Publication of EP2119816A1 publication Critical patent/EP2119816A1/de
Application granted granted Critical
Publication of EP2119816B1 publication Critical patent/EP2119816B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D4/00—Spinnerette packs; Cleaning thereof
    • D01D4/02—Spinnerettes
    • D01D4/025—Melt-blowing or solution-blowing dies
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/098—Melt spinning methods with simultaneous stretching
    • D01D5/0985—Melt spinning methods with simultaneous stretching by means of a flowing gas (e.g. melt-blowing)

Definitions

  • the present invention relates to the field of spunbond technology or meltblown technology.
  • the invention relates to an improved spinneret for manufacturing spunbonded or meltblown nonwovens, said spinneret comprising bilobal spinning orifices.
  • Spunbonded nonwoven webs are produced by depositing extruded spun filaments onto a collecting moving belt, preferably a foraminous belt, in a random manner, and by bonding the filaments.
  • an extrusion die comprising a plate perforated with a lot of small orifices, and usually referred as spinneret plate, is used.
  • a spinneret plate comprises more than one hundred spinning orifices per meter.
  • the continuous spun filaments are formed by forcing one or several molten thermoplastic polymers to pass through said small orifices of the spinneret plate.
  • only one spinneret plate can be used or several spinneret plates that are placed side by side can be used.
  • each filament is given by the geometry of the spinning orifice of the spinneret plate through which the filament is being formed.
  • Different shapes of filaments can be produced to date, like for example round filaments, bilobal filaments, trilobal filaments. More particularly, for producing a bilobal filament, also commonly referred as "papillon" filament, a bilobal orifice consisting essentially of two circular apertures connected with one another by a connecting aperture is used. All the spinning orifices of a spinneret plate can have the same geometry, or a spinneret plate can have spinning orifices of different shapes, like for example round orifices combined with bilobal orifices.
  • the spun filaments are rapidly cooled by cold air streams that are blown below the spinneret plate (quenching step), and the filaments are then stretched and attenuated by additional blown air streams in order to orient the molecular chains and increase the filament strength.
  • the melt blown process is somewhat similar to the spunbond process from an equipment and operator's point of view.
  • the two main differences between a melt blown process and a spunbond process that use air attenuation are: (i) the temperature and volume of air used to attenuate the filaments and (ii) the location where the filament draw or attenuation force is applied.
  • a meltblown process a high volume air flow at a temperature which is typically equal or slightly greater than the melt temperature of the polymer, is used to attenuate the filaments.
  • the spunbond process generally uses a smaller volume of cold air close to ambient temperature to first quench and solidify the filaments and then to attenuate said filaments.
  • the draw or attenuation force is applied at the exit of the extrusion die (spinneret) while the polymer is still in the molten state, whereas in the spunbond process, this force is applied at some distance from the spinneret plate, after the polymer has been cooled and solidified (quenching step).
  • the spinneret of a spunbonded unit comprises an apertured spinneret plate through which the molten polymer is extruded
  • the spinneret generally comprises a so-called die nosepiece with spinning orifices.
  • die nosepiece There are typically two types of die nosepiece.
  • One type is the capillary type wherein slots are milled into a flat surface and then matched with identical slots milled into a mating surface. The two halves are then matched and carefully aligned to form a row of spinning orifices.
  • the second type is the drilled-hole type wherein spinning orifices are drilled in a single block of metal.
  • One main objective of the invention is to improve the spinning of bilobal filaments in a spunbond process or in a meltblown process.
  • the particular orientation of the bilobal spinning orifices as defined in claim 1 improves the circulation of the air around the filaments, and thus improves the cooling and attenuation of the filaments.
  • FIG. 1 shows a spunbonding unit 1 comprising:
  • thermoplastic polymer In operation, a thermoplastic polymer, optionally blended with additives, is processed in the extruder 10 in order to obtain a molten polymer. Said molten polymer is pumped by the spinning pump 11 within the duct 12 and through the filter 13, and is fed by the spinning pump 11 to the spinning pack 140 (extrusion die).
  • the spinning pack 140 comprises a spinneret plate 140a of longitudinal axis X and having a lot of bilobal spinning orifices 141.
  • the spinneret plate 140a comprise for example between 2000 orifices per meter (in the direction of longitudinal axis X), and 6000 orifices per meter. This plate 140 is orientated in such a way that the longitudinal axis X of the plate is perpendicular to the plan of figure 1 .
  • the spinneret plate 140a comprises a top surface 140b and a bottom surface 140c.
  • a first cavity 141 a For each bilobal spinning orifice 141, a first cavity 141 a, a second cavity 141 c of smaller dimension in cross section, and a transition cavity 141 b connecting the first 141 a and second cavity 141c are drilled in the plate 140a.
  • the first cavity 141a has a cylindrical cross section and has a polymer inlet 141d in the top surface 140b of the spinneret plate 140a.
  • the second cavity 141c has a bilobal cross section and a polymer outlet 141 (bilobal orifice) in the bottom surface 140c of the spinneret plate 140a.
  • the polymer flow is symbolized by arrow P.
  • the filtered molten polymer is pushed and forced by the spinning pump 11 through the cylindrical cavity 141a, through the transition portion 141 b and through the second bilobal cavity 141c of each spining orifice 141 and forms continuous spun filaments F at the outlet of the spinneret plate 140a.
  • the spun continuous filaments F have a bilobal shape corresponding to the shape of the bilobal spinning orifices 141.
  • air suction means 15 comprising two suction boxes are provided for sucking the monomers and oligomers (by products) from the spinning pack.
  • air quenching means 16 comprising air cooling boxes 16a, 16b, are provided for blowing cold air streams F 1, F 2 on both sides of the curtain of filaments F.
  • Said cold air streams F 1, F 2 are directed towards the curtain of filaments F in a transversal direction ( figure 1 - arrow T) that is substantially parallel to the spinneret plate 140a and perpendicular to the longitudinal axis X of the spinneret plate 140a.
  • the filaments F are rapidly cooled by said cold air streams F 1 , F 2 .
  • This cooling step is more commonly referred as quenching step.
  • the air drawing unit 17 is positioned below the air quenching means 16, and is knowingly used for stretching and attenuating the filaments F trough an attenuating slot 17a, by means of compressed air streams F3 blown towards the filaments F. This attenuation step increases the orientation of the polymer chains and is performed in order to obtain filaments having notably the required strength and count.
  • the attenuated filaments F are deposited in a random manner onto the moving belt 18 in order to form a spunbonded web.
  • the width of this spunbonded web corresponds to the longitudinal axis (X) of the spinneret plate 140a.
  • each bilobal orifice 141 is constituted by two round apertures 141a, 141b that are connected to each other by a straight junction aperture 141c as shown in figure 4 .
  • Each bilobal orifice 141 is characterized by a longitudinal central axis A passing through the centre O a , O b of the two aforesaid round portions 141 a, 141 b.
  • each bilobal orifice 141 is titled in relation to the transversal direction T (main direction of the air streams F1, F2).
  • the angle between direction T and the longitudinal axis A of a bilobal orifice 141 is referred ⁇ .
  • the angle between the longitudinal axis X of the spinneret plate 140a and the longitudinal axis A of a bilobal orifice 141 is referred ⁇ .
  • ⁇ 90 ⁇ ° ⁇ ⁇
  • angle ⁇ is between 3° and 15°, and preferably between 5° and 10°, which correspond to an angle ⁇ between 87° and 75°, and preferably between 85° and 80°.
  • ⁇ is generally equal to 3° and preferably at least equal to 5°
  • a better circulation of the air flows between the filaments F is achieved and the cooling of the bilobal filaments is more efficient and more uniform on the whole surface of the filament.
  • the attenuation of the filaments F is also improved.
  • angle ⁇ is preferably not more than 15°, and even more preferably not more than10°, because for higher values, the surfaces of the bilobal filament in front of the air stream F1 or F2 is in that case too large, and the curtain formed by the filaments F tends to be detrimentally deformed by the air streams (F1, F2).
  • angle ⁇ is 7.5°, i.e. angle ⁇ is preferably equal to 82.5°.
  • all the bilobal orifices 141 have the same orientation (i.e. angle ⁇ is the same for all the bilobal orifices 141 or otherwise stated the central longitudinal axis A of the bilobal orifices 141 are parallel).
  • the values of the angle ⁇ (or ⁇ ) of the bilobal orifices 141 can be different ; preferably, but not necessarily, all angles ⁇ ( or ⁇ ) are however within the range of the invention.
  • spinneret plate 140a all the orifices of the spinneret plate 140a are not necessary bilobal, but in another variant the spinneret plate 140a can have bilobal orifices combined with non bilobal orifices (e.g. round orifices, trilobal orifices).
  • the bilobal orifices 141 of the spinneret plate 140a are aligned in order to form a plurality of row R i that are substantially parallel to the longitudinal axis X of the spinneret plate 140a.
  • the bilobal orifices 141 of two adjacent rows R i of orifices 141 are longitudinally offset to achieve a better circulation of air between the rows R i and thus a better cooling and attenuation of the filaments F.
  • the invention is not limited to a spinneret plate 140a for a spunbonding unit, but in reference to figures 6 to 8 the invention can also be used for making a spinneret of a meltblown unit.
  • a spinneret for a meltblown unit comprises a die nosepiece 140'a wherein spinning bilobal orifices 141 are drilled.
  • the melt blown unit further comprises at least one extruder, a spinning pump, and air blowing means for attenuating the filaments that are extruded from the spinneret ;
  • All the bilobal orifices 141 are aligned along axis X of the die nosepiece 140'a ( figure 8 ) and are fed with the polymer through an internal distribution cavity 140'b having a polymer inlet 140'c ( figure 7 ).
  • This die nosepiece 140'a is assembled with a block 140'd for forming two lateral air channels 140'e.
  • the high velocity and hot air for the attenuation of the filaments is blown in a known way inside these air channels 140'e ( figure 7 / arrow F4).
  • each bilobal spinning orifice 141 is tilted in relation to the longitudinal axis X of the spinneret (angle ⁇ ).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Nonwoven Fabrics (AREA)

Claims (8)

  1. Spinndüse (140a, 140'a) zum Erzeugen eines Erspinnvlieses oder eines Meltblow-Vlieses, wobei die Spinndüse eine Längsachse (X) aufweist, die der Breite des Vlieses entspricht, und wobei die Spinndüse zweilappige Spinnöffnungen (141) umfasst, die jeweils eine Längsmittelachse (A) besitzen,
    dadurch gegenzeichnet, dass
    der Winkel (α) zwischen der Längsachse (X) der Spinndüse und der Längsmittelachse (A) einer zweilappigen Spinnöffnung (141) zwischen 75° und 87° liegt.
  2. Spinndüse nach Anspruch 1, dadurch gegenzeichnet, dass der Winkel (α) zwischen der Längsachse (X) und der Längsmittelachse (A) einer der zweilappigen Spinnöffnungen (141) zwischen 80° und 85° liegt.
  3. Spinndüse nach Anspruch 2, dadurch gegenzeichnet, dass der Winkel (α) ungefähr 82,5° beträgt.
  4. Spinndüse nach einem der vorhergehenden Ansprüche 1 bis 3, dadurch gegenzeichnet, dass die Läugsmittelachsen (A) sämtlicher zweilappiger Spinnöffnungen (141) parallel sind.
  5. Spinndüse nach einem der vorhergehenden Ansprüche 1 bis 4, dadurch gegenzeichnet, dass die zweilappigen Spinnöffnungen (141) in Reihen (Ri) angeordnet sind, die parallel zur Längsachse (X) der Spinndüse sind, wobei die zweilappigen Spinnöffnungen (141) zweier benachbarter Reihen (Ri) in Längsrichtung versetzt sind.
  6. Spinndüse nach einem der vorhergehenden Ansprüche 1 bis 5 ausgebildet als gelochte Spinndüsenplatte (140a).
  7. Spinnvlieseinheit umfassend wenigstens einen Extruder (10), eine Spinnpumpe (11), eine Spinndüse (140a) und Ventilationsmittel (16, 17) zum Kühlen und Bedämpfen der aus der Spinndüse extrudierten Elementarfäden, wobei die Spinndüse (140a) nach einem der Ansprüche 1 bis 6 ausgebildet ist.
  8. Meltblow-Einheit umfassend wenigstens einen Extruder, eine Spinnpumpe, eine Spinndüse (140'a) und Ventilationsmittel zum Bedämpfen der aus der Spinndüse extrudierten Elementarfäden, wobei die Spinndüse (140'a) nach einem der Ansprüche 1 bis 6 ausgebildet ist.
EP08008901A 2008-05-14 2008-05-14 Spinndüse mit zweilappigen Spinnöffnungen Active EP2119816B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PL08008901T PL2119816T3 (pl) 2008-05-14 2008-05-14 Dysza przędzalnicza zawierająca dwupłatkowe kanaliki przędzalnicze
EP08008901A EP2119816B1 (de) 2008-05-14 2008-05-14 Spinndüse mit zweilappigen Spinnöffnungen
AT08008901T ATE494405T1 (de) 2008-05-14 2008-05-14 Spinndüse mit zweilappigen spinnöffnungen
DE602008004316T DE602008004316D1 (de) 2008-05-14 2008-05-14 Spinndüse mit zweilappigen Spinnöffnungen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08008901A EP2119816B1 (de) 2008-05-14 2008-05-14 Spinndüse mit zweilappigen Spinnöffnungen

Publications (2)

Publication Number Publication Date
EP2119816A1 EP2119816A1 (de) 2009-11-18
EP2119816B1 true EP2119816B1 (de) 2011-01-05

Family

ID=39967410

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08008901A Active EP2119816B1 (de) 2008-05-14 2008-05-14 Spinndüse mit zweilappigen Spinnöffnungen

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Country Link
EP (1) EP2119816B1 (de)
AT (1) ATE494405T1 (de)
DE (1) DE602008004316D1 (de)
PL (1) PL2119816T3 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SI2603626T1 (sl) * 2010-08-12 2015-04-30 Boma Engineering Srl Postopek in naprava za navijanje vlaken, še posebej za izdelavo netkanega vlaknastega materiala
CN103981582A (zh) * 2014-06-04 2014-08-13 徐伯琴 T字型涤纶纤维喷丝板

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3554854A (en) * 1962-02-03 1971-01-12 Freudenberg Carl Kg Non-woven fabric
US4753834A (en) * 1985-10-07 1988-06-28 Kimberly-Clark Corporation Nonwoven web with improved softness
WO2003014429A1 (en) * 2001-08-11 2003-02-20 Tencel Limited Spinneret
DE102006029972A1 (de) * 2006-06-29 2008-01-03 Irema-Filter Gmbh Vorrichtung zur Erzeugung eines Faservlieses im Melt-Blown-Verfahren
CN201053042Y (zh) * 2007-06-12 2008-04-30 上海德福伦化纤有限公司 一种十字型丝孔的喷丝板

Also Published As

Publication number Publication date
DE602008004316D1 (de) 2011-02-17
ATE494405T1 (de) 2011-01-15
PL2119816T3 (pl) 2011-06-30
EP2119816A1 (de) 2009-11-18

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