EP0071085A1 - Procédé pour la production reproductible de particules, ayant une géométrie différente, à partir de dispersions, de solutions ou de fondus de polymères - Google Patents

Procédé pour la production reproductible de particules, ayant une géométrie différente, à partir de dispersions, de solutions ou de fondus de polymères Download PDF

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Publication number
EP0071085A1
EP0071085A1 EP82106301A EP82106301A EP0071085A1 EP 0071085 A1 EP0071085 A1 EP 0071085A1 EP 82106301 A EP82106301 A EP 82106301A EP 82106301 A EP82106301 A EP 82106301A EP 0071085 A1 EP0071085 A1 EP 0071085A1
Authority
EP
European Patent Office
Prior art keywords
particles
hollow body
rotating
fixing agent
film
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
EP82106301A
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German (de)
English (en)
Other versions
EP0071085B1 (fr
Inventor
Richard Dr. Bung
Karl Gans
Gerold Schreyer
Gerhard Welzel
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Priority to AT82106301T priority Critical patent/ATE9915T1/de
Publication of EP0071085A1 publication Critical patent/EP0071085A1/fr
Application granted granted Critical
Publication of EP0071085B1 publication Critical patent/EP0071085B1/fr
Expired legal-status Critical Current

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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
    • D01D5/18—Formation of filaments, threads, or the like by means of rotating spinnerets
    • 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
    • D01D5/40—Formation of filaments, threads, or the like by applying a shearing force to a dispersion or solution of filament formable polymers, e.g. by stirring

Definitions

  • the present invention relates to a process for the reproducible production of shaped particles of different geometries from polymer dispersions, solutions or melts.
  • molded particles such as binding fibers or fibrils, have been produced from polymer dispersions or solutions for strengthening nonwovens by precipitation of the dispersion or solution in a precipitation bath which is subjected to a strong shear field.
  • a precipitation bath which is subjected to a strong shear field.
  • DOS 16 60 628 describes the precipitation after the dispersion has emerged from capillaries into a turbulent, passing precipitation bath.
  • CH patent 487 672 a felling unit is described which generates strong shear with rotors and shear blades.
  • the polymer dispersion is injected under pressure in a thin stream into a moderately stirred precipitation bath, the polymer having to have a certain glass transition temperature.
  • fibrils are obtained by precipitation in a shear field of the precipitation bath generated by nozzles.
  • DOS 25 16 561 describes precipitation in a shear field with an average energy density of at least 5 Ws / cm.
  • binding fibers are produced by precipitation with simultaneous division in a shear field of a precipitation bath.
  • the shaped particles should be coagulated or fixed in their form in a precipitant or fixative and should be present as a suspension with different solids content in the respective precipitant or fixative.
  • the geometry of the shaped particles should be able to be varied from fiber and lamellar to spherical and lamellar structures. In order to be able to optimize further processing or application parameters, the particles should have a narrow shape spectrum.
  • the threads, droplets or lamellae which are still liquid are introduced into a precipitating or fixing agent film rotating in the same direction or in the opposite direction.
  • the particles are additionally and specifically deformed and coagulated in the precipitating or fixing agent or their shape is fixed. In this way, longer threads can be crushed, droplets flattened into slices and the still liquid lamellae can be branched. Due to the axial film speed, the shaped particles are transported away from the point of entry without agglomerating and discharged suspended in the precipitating or fixing agent.
  • the particular advantage of this method is that already preformed, still liquid particles, which have a narrow shape spectrum when using, for example, a rotating disk or a rotating ultrasonic atomizer, can be additionally and specifically deformed, with the primary witnessed, narrow shape spectrum is preserved and on the other hand, the deformation is virtually frozen by the precipitating or fixing agent.
  • the precipitating or fixing agent is funnel-shaped by a rotating annular gap on the inner surface of a likewise rotating hollow body which is open on at least one side and whose longitudinal geometry is cylindrical or can be curved, applied. Due to the internal longitudinal geometry but also by annular depressions or elevations of the inner wall of the rotating hollow body, the resulting centrifugal forces can form storage volumes which have a residence time which can be set via the amount of precipitant or fixative added and the associated coagulation or prior to the discharge of the suspension Allow fixing time of the shaped particles.
  • a further embodiment of the invention provides for the addition of fillers to the precipitating or fixing agent prior to film formation, as a result of which the filler and molding particles are simultaneously and homogeneously suspended due to the uniform and annular entry of the shaped particles produced into the precipitating or fixing agent suspension.
  • annular openings are made in front of the discharge opening of the hollow body, which, due to their geometry and the rotation of the hollow body, supported or reduced by an overpressure or underpressure impressed on the exterior in relation to the interior of the rotating hollow body, an adjustable throwing off of the excess precipitation or Allow fixative.
  • FIG. 1 shows a sectional drawing of the front view of a precipitation or fixing apparatus.
  • the precipitator essentially consists of a rotating hollow cylinder 1 with a distributor disk 5, an annular fixative feed channel 8 and a rotating disk 2 with product feed 10.
  • the product 9 is applied centrally to the disk 2 through the feed pipe 10 and by rotation to the edge thereof Droplets, threads or lamellas are divided.
  • the still liquid particles 4 are introduced by the centrifugal force radially outward into the fixing agent film 3, which also rotates with the hollow cylinder 1, and are transported downward away from the point of entry.
  • the hollow cylinder 1 has a likewise ring-shaped zone with bores 13 which, depending on the particle geometry, are covered on the inside with a screen film 14. Due to the centrifugal forces acting on the fixative suspension, the fixative is thrown off into an annular chamber 15. The remaining moist product is discharged through wipers 17 arranged in a star shape in the interior without being flung off into the openings 18 of a housing 11 underneath.
  • the annular chamber 15 can be subjected to an overpressure or underpressure via bores 16 with respect to the interior of the hollow cylinder 1, as a result of which the amount of fixative to be thrown out can be adjusted independently of the speed of the hollow cylinder 1. Through holes in the bottom of the In the annular chamber 15, the centrifuged fixative can be discharged and returned to an inlet 19, for example in a circle.
  • the fixative supplied via the pipe 19 is introduced into the annular channel 8 of the distributor disk 5. Due to the rotation of the distributor disk 5 and the ring channel 8, the fixing agent is thrown outwards and conveyed through the annular gap 6 between the distributor disk 5 and the hollow cylinder inner wall 1.
  • the connecting ribs 7 distributed over the circumference of the ring channel 8 support the rotational acceleration of the stationary fixative. This creates an evenly distributed and co-rotating fixative template, which can be used to produce a co-rotating and uniformly thick fixative film with the annular gap 6.
  • the respective product is fed here centrally through the axis 22 of the distributor disc 5 onto the disc 2.
  • the feed tube 10 is rotatably mounted in the distributor axis 22 and is connected to the disc 2 by sheet-shaped webs 12 and their axis. This allows the feed pipe with the disk 2 to rotate independently of the distributor speed and allows the product to be applied and distributed to the disk 2 free of rotational acceleration.
  • the hollow cylinder 1 and the disk 2 are driven separately by motors 20 and 21 here.
  • the speeds of the fixing agent film 3 and the splitter disk 2 can thus be set independently of one another, as a result of which reproducible secondary deformations of the immersed and still liquid particles can be achieved.
  • the advantages that can be achieved with the invention are, in particular, that instead of being largely turbulent and Statistical division, deformation and fixation of, for example, polymer dispersions, preformed, still liquid particles of a product that can be produced in a narrow form spectrum can be converted into shaped particles with different geometry and a narrow form spectrum by means of a specifically adjustable, variable secondary deformation with simultaneous fixation.
  • This allows the geometry of the shaped particles to be optimized in accordance with the respective intended use. For example, the penetration depths of binding particles from polymer dispersions in nonwovens and thus their mechanical properties can be optimized or varied.
  • a further advantage is the possibility of adding filler particles to the product or the fixative before the production of the molded particles, as a result of which the molded particles can be mixed homogeneously with the filler particles at the same time as they are fixed, without an additional process step.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacturing Of Micro-Capsules (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Moulding By Coating Moulds (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Immobilizing And Processing Of Enzymes And Microorganisms (AREA)
  • Cosmetics (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
EP82106301A 1981-07-22 1982-07-14 Procédé pour la production reproductible de particules, ayant une géométrie différente, à partir de dispersions, de solutions ou de fondus de polymères Expired EP0071085B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82106301T ATE9915T1 (de) 1981-07-22 1982-07-14 Verfahren zur reproduzierbaren herstellung von formteilchen unterschiedlicher geometrie aus polymerdispersionen, schmelzen oder loesungen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3128872 1981-07-22
DE19813128872 DE3128872A1 (de) 1981-07-22 1981-07-22 Verfahren zur reproduzierbaren herstellung von formteilchen unterschiedlicher geometrie aus polymerdispersionen, schmelzen oder loesungen

Publications (2)

Publication Number Publication Date
EP0071085A1 true EP0071085A1 (fr) 1983-02-09
EP0071085B1 EP0071085B1 (fr) 1984-10-17

Family

ID=6137425

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82106301A Expired EP0071085B1 (fr) 1981-07-22 1982-07-14 Procédé pour la production reproductible de particules, ayant une géométrie différente, à partir de dispersions, de solutions ou de fondus de polymères

Country Status (5)

Country Link
US (1) US4485055A (fr)
EP (1) EP0071085B1 (fr)
JP (1) JPS5829825A (fr)
AT (1) ATE9915T1 (fr)
DE (2) DE3128872A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4241514A1 (de) * 1992-12-10 1994-06-16 Freudenberg Carl Fa Spinnrotor
WO1996027700A1 (fr) * 1995-03-03 1996-09-12 Akzo Nobel N.V. Procede de filature par centrifugation de solutions se pretant a cette technique

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3787700T3 (de) * 1986-10-29 1998-12-24 Kanegafuchi Kagaku Kogyo K.K., Osaka Gleichförmige Polymerteilchen.
JPS63236608A (ja) * 1987-03-26 1988-10-03 Kinzoku Kogyo Jigyodan 凝固造粒装置
US5342557A (en) * 1990-11-27 1994-08-30 United States Surgical Corporation Process for preparing polymer particles
US5143662A (en) * 1991-02-12 1992-09-01 United States Surgical Corporation Process for preparing particles of bioabsorbable polymer
GB2377661B (en) * 2001-07-20 2005-04-20 Univ Newcastle Methods of manufacturing particles
DE102010010553A1 (de) * 2010-03-05 2011-09-08 Carl Freudenberg Kg Verfahren zur Herstellung von Fasern aus Polymerdispersionen
CN103498203B (zh) * 2013-09-26 2016-12-07 徐东 湿法纺丝离心式生产设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3661864A (en) * 1969-03-19 1972-05-09 Monsanto Co Method of producing controlled-form precipitates
FR2160988A1 (fr) * 1971-11-26 1973-07-06 Gulf Research Development Co
FR2199015A2 (en) * 1971-10-29 1974-04-05 Gulf Research Development Co Polymeric fibre paper - or non-woven fibre web, from polyolefins (co)poly-mers
FR2258467A2 (fr) * 1974-01-21 1975-08-18 Ici Ltd
DE2600624B1 (de) * 1976-01-09 1977-01-20 Basf Ag Vorrichtung zur herstellung von fibrillen aus polymerisaten

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2439772A (en) * 1946-04-09 1948-04-13 Steel Shot Producers Inc Method and apparatus for forming solidified particles from molten material
US4127158A (en) * 1973-10-15 1978-11-28 Toyo Kohan Co., Ltd. Process for preparing hollow metallic bodies
US4323524A (en) * 1977-03-11 1982-04-06 Imperial Chemical Industries Limited Production of fibres
NZ187979A (en) * 1977-07-29 1982-05-31 Ici Ltd Centrifugal spinning of fibres from liquid
US4303433A (en) * 1978-08-28 1981-12-01 Torobin Leonard B Centrifuge apparatus and method for producing hollow microspheres

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3661864A (en) * 1969-03-19 1972-05-09 Monsanto Co Method of producing controlled-form precipitates
FR2199015A2 (en) * 1971-10-29 1974-04-05 Gulf Research Development Co Polymeric fibre paper - or non-woven fibre web, from polyolefins (co)poly-mers
FR2160988A1 (fr) * 1971-11-26 1973-07-06 Gulf Research Development Co
FR2258467A2 (fr) * 1974-01-21 1975-08-18 Ici Ltd
DE2600624B1 (de) * 1976-01-09 1977-01-20 Basf Ag Vorrichtung zur herstellung von fibrillen aus polymerisaten

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4241514A1 (de) * 1992-12-10 1994-06-16 Freudenberg Carl Fa Spinnrotor
WO1996027700A1 (fr) * 1995-03-03 1996-09-12 Akzo Nobel N.V. Procede de filature par centrifugation de solutions se pretant a cette technique
EP0939148A1 (fr) * 1995-03-03 1999-09-01 Akzo Nobel N.V. Procédé de filature par centrifugation de solutions se prêtant à cette technique
US6159597A (en) * 1995-03-03 2000-12-12 Akzo Nobel Nv Centrifugal spinning process for spinnable solutions

Also Published As

Publication number Publication date
ATE9915T1 (de) 1984-11-15
US4485055A (en) 1984-11-27
EP0071085B1 (fr) 1984-10-17
DE3260998D1 (en) 1984-11-22
JPS5829825A (ja) 1983-02-22
DE3128872A1 (de) 1983-02-10

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