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WO2019162175A1 - Dispositif de production de fines particules polymères - Google Patents

Dispositif de production de fines particules polymères Download PDF

Info

Publication number
WO2019162175A1
WO2019162175A1 PCT/EP2019/053635 EP2019053635W WO2019162175A1 WO 2019162175 A1 WO2019162175 A1 WO 2019162175A1 EP 2019053635 W EP2019053635 W EP 2019053635W WO 2019162175 A1 WO2019162175 A1 WO 2019162175A1
Authority
WO
WIPO (PCT)
Prior art keywords
spray head
suction
spray
polymer particles
inlet
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.)
Ceased
Application number
PCT/EP2019/053635
Other languages
German (de)
English (en)
Inventor
Thorsten Wawra
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.)
Oerlikon Textile GmbH and Co KG
Original Assignee
Oerlikon Textile GmbH and Co KG
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 Oerlikon Textile GmbH and Co KG filed Critical Oerlikon Textile GmbH and Co KG
Publication of WO2019162175A1 publication Critical patent/WO2019162175A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/10—Making granules by moulding the material, i.e. treating it in the molten state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
    • B01J2/04—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/12—Making granules characterised by structure or composition
    • B29B2009/125—Micropellets, microgranules, microparticles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion

Definitions

  • the invention relates to a device for the production of fine polymer particles from a polymer melt according to the preamble of claim 1.
  • a generic device for producing fine polymer particles from a polymer melt is known, for example, from US Pat. No. 9,321,207 B2.
  • a polymer is melted via an extrusion device and extruded by means of a spray head to form fine polymer particles.
  • a heated process air is used, which is supplied to the spray head for generating a high-energy spray stream.
  • the spray stream is then taken up by a suction device in order to collect the polymer particles can.
  • a secondary air from the environment is used below the spray head, which allows the required cooling of the polymer particles.
  • suction device is held directly on an underside of the spray head with an extraction shaft opening open to the surroundings and that the suction shaft opening below the spray head forms an inlet zone with a direct connection to a suction duct and at least one suction duct Deflection zone for shielding and deflecting the spray stream forms.
  • the inventive device for the production of fine polymer particles has the particular advantage that the suction device can be arranged directly on the underside of the spray head, so that long transition distances are avoided.
  • the secondary air is guided below the spray head in a deflection zone, which brings about a flow guidance directly into the inlet zone and thus directly into the spray flow.
  • the cooling effects of the secondary air can be better utilized and, on the other hand, a widening of the spray flow can be prevented.
  • lengthy spray heads are preferably used which have a plurality of rows of spray nozzles.
  • the development of the invention is preferably carried out, in which the inlet zone is formed in the middle region of the suction duct opening and in which the inlet zone is enclosed by the opposite deflection zones.
  • the secondary air can be uniformly supplied to both longitudinal sides of the spray stream.
  • the inlet zone is preferably formed concentrically to the spray stream, so that the secondary air can be fed radially on all sides.
  • the suction duct below the inlet zone is designed as a diffuser. Thus occurs an advantageous deceleration of the spray stream.
  • the development of the invention has proved successful, in which the diffuser is formed in two stages with an inlet opening angle and an outlet opening angle, wherein the inlet opening angle is smaller than the outlet opening angle. This avoids an abrupt change in the flow of the spray stream immediately below the spray head.
  • the air guidance within the deflection zone is preferably achieved by the fact that the deflection zone is limited towards the bottom by a separating plate assigned at a distance to the outlet shaft opening, wherein the separating plate forms an ascending partition plate ramp in the direction of the inlet zone.
  • the parallel guidance of the spray stream and the secondary air stream is limited to a length defined by a distance between them Spray head and the separating plate is limited.
  • each of the separating plate ramps is formed on both longitudinal sides of the inlet zone, the separating plate ramps preferably lying opposite each other in terms of mirror symmetry.
  • the further development of the invention is particularly advantageous, in which the inlet zone and the opposite deflection zones are bounded laterally by sieve walls, which are held within the suction shaft opening as a sieve frame and gas-permeable.
  • the Siebwandungen preferably have a pore size, which prevent the escape of polymer particles.
  • the screen frame can be arranged directly below the spray head.
  • an entry zone can be defined via the screen frame, which captures the entire spray stream of the spray head.
  • the screen frame is preferably supported by the separating plate of the extraction shaft opening.
  • the inlet of the suction duct is advantageously enclosed by the screen frame.
  • the suction duct is designed to be height-adjustable, wherein between the walls of the suction duct opening and the underside of the spray head in each case an air gap is formed. On the one hand, this limits the amount of secondary air flowing in, and on the other hand, the spray head can be accessed unhindered in the event of maintenance.
  • Fig. 1 shows schematically a side view of a first embodiment of the inventive device for the production of fine polymer lymerpumblen
  • FIG. 2 is a schematic cross-sectional view of the embodiment of FIG. 1.
  • FIG. 3 is a schematic view of a sieve frame of the embodiment of FIGS. 1 and 2
  • Fig. 4 shows schematically a plan view of the inlet of the suction duct with an elongate spray head
  • FIGS. 1 and 2 schematically shows a plan view from the inlet of the suction duct with a round spray head.
  • FIGS. 1 and 2 an embodiment of the apparatus according to the invention for the production of fine polymer particles from a polymer melt is shown schematically in several views.
  • Fig. 1 shows a side view of the embodiment
  • Fig. 2 is a cross-sectional view of the longitudinal side shown in Fig. 1 is shown. In so far no Express reference is made to one of the figures, the following description applies to both figures.
  • the exemplary embodiment shows an extrusion device 1 which has an extruder 3, a pump 4 and a spray head 2.
  • the spray head 2 is connected via a melt inlet 5 with the pump 4, which is coupled via a pipe to the outlet of the extruder 3.
  • a process air supply 6 is arranged, which is connected to a process air source, not shown here.
  • the spray head 2 has on its underside 18 a plurality of spray nozzles 7, each of which has a central capillary and an air duct.
  • the spray nozzles 7 are arranged in several rows next to each other on the underside 18 of the spray head 2.
  • the suction device 8 is formed of a movable suction nozzle 21 and a stationary suction channel 22, which engage with each other.
  • the suction nozzle 21 can be pushed back and forth by the piston-cylinder units 23 in the vertical direction.
  • the suction nozzle 21 is arranged in an operating position below the spray head 2.
  • the suction nozzle 21 has a suction shaft opening 9 at an end facing the spray head 2 on.
  • the suction duct opening 9 is held at a short distance from the underside 18 of the spray head 2 and thus forms an air gap 20 through which a secondary air flow generated from the environment can enter the suction duct opening 9.
  • the suction duct opening 9 has in the middle region a suction duct 10, which is formed with an inlet 12 at a distance from the suction opening 9.
  • the area between the inlet 12 of the suction chute 10 and the underside 18 of the spray head 2 is referred to here as an inlet zone.
  • the inlet zone below the spray head 2 is identified by the reference numeral 11.
  • the inlet zone 11 is shielded on both longitudinal sides in each case by a deflection zone 13 with respect to the environment.
  • the deflection zones 13 in this case extend in the vertical direction between the underside 18 of the spray head 2 and a separating plate 14, which are arranged mirror-symmetrically on both longitudinal sides within the shaft walls 15 of the suction nozzle 21.
  • the separating plates 14 each form a separating plate ramp 14.1, which are formed rising in the direction of the spray head 2 and extend to the inlet 12 of the suction shaft 10.
  • the inlet zone 11 and the deflection zones 13 are bounded by a plurality of screen walls 16. 1 of a screen frame 16.
  • the sieve frame 16 is designed to be open with respect to the underside 18 of the spray head 2 and opposite the inlet 12 of the suction chute 10. In that regard, only the longitudinal sides and the transverse sides are limited by one of the Siebwandungen 16.1.
  • Fig. 3 for this purpose a view of the screen frame 16 is shown, as in the embodiment of FIGS. 1 and 2 executed.
  • the sieve frame 16 is supported on the underside of the spray head 2 and on the dividing plates 14 of the suction nozzle 21.
  • the sieve screen 16 encloses the elongate inlet 12 of the suction chute 10.
  • FIG. 4 shows a top view of the inlet 12 of the suction chute 10.
  • one or more seals 17 are arranged between the underside 18 of the spray head 2 and an upper side 16. 2 of the screen frame 16, depending on the design. In this case, both the longitudinal sides and the transverse sides of the screen frame 16 are sealed to the environment.
  • the sieve walls 16. 1 of the sieve frame 16 are designed to be permeable to gas, wherein the pore size selected in the sieve frame 16 is smaller than the polymer particles produced by the spray head 2.
  • the suction duct 10 has a diffuser 19 which is formed by a first diffuser stage 19. 1 and a second diffuser stage 19. 2.
  • the first diffuser stage has an inlet opening angle
  • the second diffuser stage has an outlet opening angle. In this case, the inlet opening angle of the first diffuser stage 19.1 is made smaller than the outlet opening angle of the second diffuser stage 19.2.
  • the second diffuser stage 19.2 opens into the suction channel 22nd Between the suction channel 22 and the suction nozzle 21, a rolling seal 24 is arranged on both longitudinal sides as well as on the transverse sides (not shown here), so that no air exchange can take place.
  • the function of the device according to the invention is explained in more detail below with reference to FIGS. 1 and 2.
  • a polymer or a polymer mixture is melted by the extruder 3.
  • the polymer melt is supplied by the pump 4 to the spray head 2 under an overpressure. Within the spray head 2, the polymer melt is ejected together with a heated process air through the spray nozzles 7 as a spray stream.
  • the spray stream thus contains the preferably heated process air and the polymer particles formed thereby.
  • the spray stream enters the inlet zone 11 immediately below the spray head 2. Due to a suction effect, a secondary air flow from the environment is sucked in by the spray stream. The secondary air flow passes through the air gap 20 in the interior of the suction duct opening 9 and enters through the Siebwandungen 16.1 in the deflection zones 13 a.
  • the vertically oriented spray stream entrains the secondary air flow with it, whereby the air flow aligned in the deflection zones 13 is braked by the separating plates 14 and the separating plate ramp 14.1.
  • the Trenn- blechrampen 14.1 cause a flow deflection toward the inlet zone 11.
  • the edge flow which is formed from the secondary air from the environment and a portion of the process air from the spray head back into the inlet zone 11.
  • the inlet zone 11 opens directly into the inlet 12 of the suction duct 10.
  • the spray stream entering the inlet 12 passes through the diffuser 19, so that a slowing down of the spray stream occurs after the first diffuser stage 19.1 and after the second diffuser stage 19.2.
  • the embodiment of FIGS. 1 to 4 is based on an elongated spray head.
  • Fig. 5 is a schematic plan view of the inlet opening 12 of the suction chute 10 is shown in a round spray head.
  • the intake 12 of the suction duct 10 is preceded by a hollow cylindrical sieve frame 16 in order to form the inlet zone 11.
  • the secondary air can be concentrically fed to the central spray stream.
  • the secondary air supplied through the screen frame 16 via the inlet zone 11 can be conditioned for the further treatment, in particular for the cooling of the polymer particles.
  • the secondary air could be tempered, accelerated or moistened in order to improve the formation of the polymer particles.
  • the device according to the invention for the production of fine polymer particles is therefore particularly suitable for safely receiving very fine polymer particles without them getting into the environment.
  • all polymer articles are safely taken up and removed.
  • a backflow is not possible through the diffuser formation of the suction channel.
  • the suction chute opening are already directly below the spray head in the area
  • the secondary air supply prevents polymer particles from getting into the environment.
  • the return of the air flow in the region of the deflection zones thus favors the absorption and removal of the polymer particles via the inlet 12 of the extraction shaft 10.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

L'invention concerne un dispositif de production de fines particules polymères à partir d'une masse fondue polymère au moyen d'un dispositif d'extrusion (1), qui présente une tête de pulvérisation (2) allongée ou ronde destinée à produire un courant de pulvérisation constitué d'un air de traitement et des particules polymères, et un dispositif d'aspiration (8) destiné à recevoir le courant de pulvérisation et à collecter les particules polymères, le dispositif d'aspiration (8) étant retenu par une ouverture (9) de puits d'aspiration débouchant sur l'extérieur directement sur une face inférieure de la tête de pulvérisation (2) et l'ouverture (9) de puits d'aspiration formant au-dessous de la tête de pulvérisation (2) une zone d'admission (11) directement reliée à un puits d'aspiration (10) et au moins une zone de déviation (13) destinée à protéger et à dévier le courant de pulvérisation.
PCT/EP2019/053635 2018-02-21 2019-02-14 Dispositif de production de fines particules polymères Ceased WO2019162175A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018001363 2018-02-21
DE102018001363.5 2018-02-21

Publications (1)

Publication Number Publication Date
WO2019162175A1 true WO2019162175A1 (fr) 2019-08-29

Family

ID=65598596

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/053635 Ceased WO2019162175A1 (fr) 2018-02-21 2019-02-14 Dispositif de production de fines particules polymères

Country Status (1)

Country Link
WO (1) WO2019162175A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5055240A (en) * 1986-04-30 1991-10-08 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Method and apparatus for producing microshells
US6171433B1 (en) * 1996-07-17 2001-01-09 Iowa State University Research Foundation, Inc. Method of making polymer powders and whiskers as well as particulate products of the method and atomizing apparatus
DE10302979A1 (de) * 2003-01-25 2004-08-05 Zapf Creation Ag Verfahren und Vorrichtung zur Herstellung eines PVC-freien im wesentlichen aus Kunststoff bestehenden Pulvers
DE10339545A1 (de) * 2003-08-26 2005-03-24 Zapf Creation Ag Verfahren und Vorrichtung zur Herstellung eines wenigstens einen Kunststoff enthaltenden Pulvers
EP1930071A1 (fr) * 2006-12-06 2008-06-11 ECKA Granulate GmbH & Ko. KG Procédé destiné à la fabrication de particules de matériau coulant et installation d'atomisation destinée à celui-ci
US20130234357A1 (en) * 2012-03-06 2013-09-12 Wisconsin Alumni Research Foundation Polymer pelletization via melt fracture
US9321207B2 (en) 2012-03-06 2016-04-26 Wisconsin Alumni Research Foundation Method and apparatus for micropelletization

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5055240A (en) * 1986-04-30 1991-10-08 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Method and apparatus for producing microshells
US6171433B1 (en) * 1996-07-17 2001-01-09 Iowa State University Research Foundation, Inc. Method of making polymer powders and whiskers as well as particulate products of the method and atomizing apparatus
DE10302979A1 (de) * 2003-01-25 2004-08-05 Zapf Creation Ag Verfahren und Vorrichtung zur Herstellung eines PVC-freien im wesentlichen aus Kunststoff bestehenden Pulvers
DE10339545A1 (de) * 2003-08-26 2005-03-24 Zapf Creation Ag Verfahren und Vorrichtung zur Herstellung eines wenigstens einen Kunststoff enthaltenden Pulvers
EP1930071A1 (fr) * 2006-12-06 2008-06-11 ECKA Granulate GmbH & Ko. KG Procédé destiné à la fabrication de particules de matériau coulant et installation d'atomisation destinée à celui-ci
US20130234357A1 (en) * 2012-03-06 2013-09-12 Wisconsin Alumni Research Foundation Polymer pelletization via melt fracture
US9321207B2 (en) 2012-03-06 2016-04-26 Wisconsin Alumni Research Foundation Method and apparatus for micropelletization

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