WO2020200674A1 - Procédé et dispositif de production de particules de plastique par faisceau laser - Google Patents

Procédé et dispositif de production de particules de plastique par faisceau laser Download PDF

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Publication number
WO2020200674A1
WO2020200674A1 PCT/EP2020/056447 EP2020056447W WO2020200674A1 WO 2020200674 A1 WO2020200674 A1 WO 2020200674A1 EP 2020056447 W EP2020056447 W EP 2020056447W WO 2020200674 A1 WO2020200674 A1 WO 2020200674A1
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WO
WIPO (PCT)
Prior art keywords
strand
laser beam
plastic
laser
nozzle
Prior art date
Application number
PCT/EP2020/056447
Other languages
German (de)
English (en)
Inventor
Matthias DÜNGEN
Martin Langlotz
Original Assignee
Lean Plastics Technologies GmbH
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 Lean Plastics Technologies GmbH filed Critical Lean Plastics Technologies GmbH
Publication of WO2020200674A1 publication Critical patent/WO2020200674A1/fr

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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
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
    • B01J19/12—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electromagnetic waves
    • B01J19/121—Coherent waves, e.g. laser beams
    • 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
    • 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
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B29B7/582—Component parts, details or accessories; Auxiliary operations for discharging, e.g. doors
    • 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
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/82—Heating or cooling
    • B29B7/826—Apparatus therefor
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/05—Filamentary, e.g. strands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • 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 method and a device for producing plastic particles.
  • plastic powder is relevant for different fields of application, especially for additive manufacturing, in which different
  • Manufacturing processes require powders that consist of thermoplastics and, for example, have particle diameters smaller than 200 ⁇ m.
  • the mean particle diameter currently most frequently used is in the range from 40 ⁇ m to 80 ⁇ m. In principle, smaller particles can also be used.
  • Precipitation processes such as in DE 29 06 647 B1, grinding processes, melt spray processes or spray drying.
  • the latter three processes are known, for example, from EP 2 115 043 B1.
  • the processes of underwater pelletizing and strand pelletizing are for example
  • US Pat. No. 9,205,590 B2 describes a process in which molten plastic is discharged from a nozzle, in principle similar to the meltblown process (see also Pinchuk, L. S .; Goldade, V. A .; Makarevich, A. V .;
  • Kestelman, VN Melt Blowing - Equipment, Technology, and Polymer Fibrous Materials, Springer, 2002).
  • the resulting melt strand is accelerated and thus accelerated by an air stream flowing out in the discharge direction next to the nozzle also rejuvenated and additionally stimulated to vibrations, which lead to a detachment of melt strands or drops from the melt strand.
  • a novel Extrusion Process for the Production of Polymer Micropellets Osswald et al., Polym. Closely. If DOI 10.1002 / pen is executed, this technology can partially lead to a successful pulverization and partially the detachment of drops fails, so that the drops are still connected by threads. Targeted manipulation of the drop size is also not known.
  • the invention is based on the object of specifying an improved method and an improved device for producing plastic particles.
  • a strand of melted plastic or a filament made of plastic is cut by means of at least one laser beam to form plastic particles.
  • the strand is conveyed continuously or discontinuously from a melt nozzle, exits essentially vertically downwards and is then cut by means of the at least one laser beam.
  • the filament is conveyed continuously or discontinuously and cut at a free end, in particular a freely hanging end, by means of the at least one laser beam.
  • the filament is conveyed discontinuously and tensioned at a free end and cut by means of at least two laser beams.
  • a fluid stream emerges from a fluid nozzle arranged around the melt nozzle in such a way that the strand is accelerated and tapered.
  • the fluid can be air, but it can also comprise other gases, for example nitrogen or other inert gases, in order to avoid oxidation or possible thermo-oxidative degradation of the melt. Fluids with a higher viscosity than air are helpful in obtaining flows with less tendency to turbulence. The job of the fluid flow is to accelerate the strand so that it tapers. In this way, the diameter of the strand can be achieved which is considerably smaller than the diameter of the melt nozzle.
  • the fluid flow is tempered in such a way that the strand does not or only slightly cools or that the strand is heated, for example by prior heating with a heating register or the like.
  • the fluid flow can be tempered in such a way that the strand does not or only slightly cools or that the strand is heated, for example by prior heating with a heating register or the like.
  • temperatures in the range of +/- 50 ° C around the temperature of the melt for example have temperatures in the range of +/- 50 ° C around the temperature of the melt.
  • the strand is guided in a tube below the fluid nozzle.
  • a fluid flow that is as uniform as possible is supported with as constant a speed as possible in the discharge direction of the melt and with as little turbulence as possible.
  • a tapering of the tube can be used to further accelerate the fluid flow and thus the
  • energy is introduced into the strand by means of the laser beam in such a way that the plastic at the relevant point on the strand suddenly evaporates or decomposes in gaseous form. In this way, thread formation can be avoided.
  • a parameter configuration can be selected in such a way that sufficient energy is introduced in order to achieve a clean, that is, thread-free, detachment of drops, in particular without any loss of material through evaporation.
  • a CO2 laser is used to generate the laser beam.
  • the wavelength used for example 10.6 pm, is usually sufficiently well absorbed by plastics.
  • the plastic is or is colored in such a way that its absorption spectrum is adapted to the wavelength of the laser used to generate the laser beam.
  • the coloring of the plastics can be used to adapt the absorption spectrum of the plastics to the wavelength of the laser beam.
  • plastics colored black absorb wavelengths in the range of most common laser sources, for example by adding carbon black.
  • Fiber lasers (typical wavelength in the range of 1064 nm) or other laser sources with shorter wavelengths than those of the C0 2 laser can thus also be used. This is beneficial to the smallest possible spot sizes
  • the laser beam is pulsed.
  • the laser beam is operated as a laser scanner so that the energy input can be controlled by guiding the laser beam or the pulsed laser radiation.
  • the energy input can be controlled by guiding the laser beam or the pulsed laser radiation.
  • the tube has at least one laterally arranged inlet that is transparent to the laser beam and through which the laser beam is guided.
  • a device according to the invention for producing plastic particles comprises a melt nozzle, from which a strand of melted plastic can be carried, and at least one laser, by means of which at least one laser beam can be guided onto the strand in order to cut the strand to form plastic particles.
  • cutting the strand can be understood to mean, on the one hand, that the energy input from the laser merely promotes the breakdown of the strand into droplets, and on the other hand that the energy input by the laser is so high that conventional laser cutting is present the energy input partially evaporates the plastic, so that a section is separated.
  • mixed forms of these two options should be included under the term of cutting the strand.
  • the melt nozzle is arranged such that the strand emerges essentially vertically downwards.
  • a fluid nozzle is provided around the melt nozzle for ejecting a fluid stream in order to accelerate and taper the strand.
  • a heating device for controlling the temperature of the
  • a tube in which the strand can be guided, is provided below the outlet of the fluid flow.
  • the tube has at least one laterally arranged inlet that is transparent to the laser beam and through which the laser beam can be guided.
  • the principle of the invention is based on the particularly continuous strand-shaped ejection of a plastic melt from a nozzle, whereupon this strand is locally heated in a pulsed manner with the aid of laser radiation in such a way that it breaks up into several parts, for example drops. These drops fall
  • the detachment of drops from the melt strand can be influenced in a more targeted manner and vibration excitation can be dispensed with.
  • Figure 1 is a schematic view of an apparatus for producing plastic particles
  • Figure 2 is a schematic view of a further embodiment of a
  • FIG. 1 shows a schematic view of a device 1 for producing plastic particles P.
  • the device 1 comprises a melt nozzle 2, from which a strand S of melted plastic is discharged. Melting the plastic and pumping the melt can be carried out, for example, by a single-screw or multi-screw extruder.
  • Surrounding the melt nozzle 2 is an annular gap-shaped fluid nozzle 3 for ejecting a fluid flow F.
  • the fluid can be air, but it can also include other gases, for example nitrogen or other inert gases, in order to avoid oxidation or possible thermo-oxidative degradation of the melt . Fluids with a higher viscosity than air are helpful in obtaining flows with less tendency to turbulence.
  • the task of the fluid flow F is to accelerate the string S so that it tapers. In this way, the diameter of the strand S can be achieved which are considerably smaller than the diameter of the melt nozzle 2. For this, and for the following step, it is useful that the strand S does not cool down or that the strand S is even heated.
  • the fluid flow F can therefore be temperature-controllable, for example by prior heating with a heating register or the like, and
  • Strand S disintegrates.
  • Fluid flow F be sheathed with a tube (not shown).
  • the tapered strand S is subsequently locally excited in a pulse-like manner with one or more laser beams L. This results in an energy input into the strand S, which the
  • Drop T is favored.
  • the energy input can be so strong that the plastic suddenly evaporates or decomposes in gaseous form at this point. On in this way thread formation can be avoided. It can be a
  • Parameter configuration can be selected such that sufficient energy is introduced to achieve a clean, that is, thread-free detachment of droplets T.
  • the roundness of the droplets T can also be influenced by controlling the temperature of the strand S and of the fluid flow F and by choosing the intensity, distribution and duration of the laser beam L. As long as the drop T is liquid, the surface tension will strive for an even rounding of the drop T.
  • the flight phase of the droplets T after the cut can thus be carried out as in a downer reactor (Sachs et al .: Characterization of a downer reactor for particle rounding, doi: 10.1016 / j.powtec.2017.01.006; Sachs et al .: Rounding of Irregular Polymer Parti cles in a Downer Reactor, doi: 10.1016 / j.proeng.2015.01.119) can be used to influence the particle shape.
  • the cooled drop T then forms a particle P.
  • the method does not necessarily require the use of the fluid flow F.
  • the laser beam L can be guided to the strand S from different sides and / or angles.
  • the laser beam L should be sufficiently absorbed by the processed plastic.
  • a CO2 laser can be used whose wavelength used, for example 10.6 pm, is usually sufficiently well absorbed by plastics.
  • the coloring of the plastics can serve to improve the
  • the absorption spectrum of the plastic to match the wavelength of the laser beam L.
  • plastics colored black absorb wavelengths in the range of most common laser sources, for example by adding carbon black.
  • melt temperature about the parameters diameter of the melt nozzle 2, melt temperature, temperature of the fluid flow F and speed of the fluid flow F is the achieved diameter of the strand S adjustable.
  • Laser pulses determine the length of the strand sections produced, which contract into drops T.
  • the method therefore makes it possible to influence the powder grain shape and size distribution more directly than in US Pat. No. 9,205,590 B2.
  • FIG. 2 shows a schematic view of a further embodiment of an apparatus 1 for producing plastic particles P.
  • the fluid nozzle 3 in the form of an annular gap from which the fluid flow F emerges can, for example, have a diameter D1 -D2 of 1.5 mm.
  • a pulsable CO 2 laser with a wavelength of 10.6 pm is used.
  • the tube 4 ends below the inlet 5, for example 2 cm below.
  • a suction with a lower fluid velocity and a larger pipe cross-section, for example at least a factor of ten larger than the pipe 4 can be provided so that cool ambient air, for example at a temperature of about 20 ° C, can be sucked in and the detached droplets T solidify can and can be fed to a collecting container.
  • the discharge direction is vertical, so that gravity supports the material flow.
  • MFR Rate (MFR) of 50 g / min (measured at 230 ° C, 2.16 kg) was used.
  • a single-screw extruder for example, is used to melt and convey the plastic.
  • the temperature of the melt is, for example, 240 ° C., as is the temperature of the air blown out in the fluid nozzle 3.
  • a fluid volume flow of, for example, 8.6 1 / min is used.
  • the laser beam L is, for example, pulsed at a frequency of 20 kHz, for example with a pulse duration of 5 ps and a power of 1100 mW.
  • the strand S is thus stretched to such an extent that a particle size of, for example, approx. 50 ⁇ m is reached when the particles P have cooled down.
  • the focus diameter of the laser beam L on the strand S is, for example, 100 gm.
  • the intensity distribution of the laser beam in the focus can approach a Gaussian distribution.
  • the strand S instead of the air-assisted take-off, provision can be made for the strand S to be deposited on a roll and taken off with the aid of an adjustable roll speed. Extreme stretching can thus be achieved.
  • the strand S cools down on the roll to form a thread (monofilament). However, it is not wound up on the roll, as is known from the manufacture of staple fibers (CH000000273678A), but continues to a section where it hangs freely while it is continuously conveyed. On this one
  • the filament is then used in the same way as in the
  • the cutting can also be decoupled from the filament production and can also be carried out discontinuously.
  • the following discontinuous design can also be used for a particularly reproducible cut:
  • the filament is unwound from a roll, the free end being tensioned, for example between two clamping jaws or with a gripper. Unwinding is stopped so that the filament is taut.
  • This filament is cut at several points by laser pulses arriving at the same time, so that numerous sections are created. There must be at least two laser pulses. However, there can also be any number of laser pulses. After the cutting process, a does not remain cut rest on the grippers / fixtures. With the method modified in this way, the filament can be controlled more easily than a strand of melt guided with an air stream.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)

Abstract

L'invention concerne un procédé et un dispositif de production de particules de plastique (P), un fil (S) de plastique fondu ou un filament constitué de plastique étant découpé par au moins un faisceau laser (L) pour former des particules de plastique (P).
PCT/EP2020/056447 2019-04-05 2020-03-11 Procédé et dispositif de production de particules de plastique par faisceau laser WO2020200674A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019109005.9 2019-04-05
DE102019109005.9A DE102019109005A1 (de) 2019-04-05 2019-04-05 Verfahren und Vorrichtung zur Herstellung von Kunststoffpartikeln

Publications (1)

Publication Number Publication Date
WO2020200674A1 true WO2020200674A1 (fr) 2020-10-08

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DE (1) DE102019109005A1 (fr)
WO (1) WO2020200674A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4048719A1 (fr) * 2019-10-23 2022-08-31 Acondicionamiento Tarrasense Procédé de production de polymères sous forme de poudre

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024012631A1 (fr) * 2022-07-15 2024-01-18 Hochschule für Technik und Wirtschaft Dresden Appareil et procédé de production de particules polymères et utilisation de particules polymères en tant que norme de particule polymère

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DE2161004A1 (de) * 1971-12-09 1973-06-14 Condux Werk Einrichtung zum granulieren von strangbzw. stangenfoermig anfallendem material
DE2906647B1 (de) 1979-02-21 1980-04-17 Huels Chemische Werke Ag Verfahren zur Herstellung von pulverfoermigen Beschichtungsmitteln auf der Basis von Polyamiden mit mindestens 10 aliphatisch gebundenen Kohlenstoffatomen pro Carbonamidgruppe
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EP1092470A1 (fr) * 1999-10-11 2001-04-18 Foseco International Limited Sintern von Pulver zur Herstellung von Granulate
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DE69828426T2 (de) 1997-10-10 2005-12-01 Microbeads As Verfahren zur herstellung von polymerteilchen
US20070172533A1 (en) * 2004-02-27 2007-07-26 Jmp Industries, Inc. Extruder system and cutting assembly
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EP2732945A1 (fr) * 2011-08-15 2014-05-21 University of Yamanashi Moyen pour la fabrication de microbilles comprenant des microparticules de polymère thermoplastique
US9205590B2 (en) 2012-03-06 2015-12-08 Wisconsin Alumni Research Foundation Polymer pelletization via melt fracture
EP2115043B1 (fr) 2007-04-05 2017-05-31 EOS GmbH Electro Optical Systems Poudre de paec, destinée à être utilisée en particulier dans un procédé de fabrication par couches d'un objet tridimensionnel et procédé de fabrication dudit objet
WO2017112723A1 (fr) 2015-12-22 2017-06-29 Structured Polymers, Inc. Systèmes et procédés pour produire une poudre consommable

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH273678A (de) 1949-05-19 1951-02-28 Inventa Ag Verfahren und Einrichtung zum Schmelzspinnen von Polyamidfäden.
DE2161004A1 (de) * 1971-12-09 1973-06-14 Condux Werk Einrichtung zum granulieren von strangbzw. stangenfoermig anfallendem material
DE2906647B1 (de) 1979-02-21 1980-04-17 Huels Chemische Werke Ag Verfahren zur Herstellung von pulverfoermigen Beschichtungsmitteln auf der Basis von Polyamiden mit mindestens 10 aliphatisch gebundenen Kohlenstoffatomen pro Carbonamidgruppe
JPH0655532A (ja) * 1992-08-10 1994-03-01 Makurosu:Kk 押出機におけるレーザカット法
DE4338212A1 (de) * 1993-11-10 1995-05-11 Nukem Gmbh Verfahren und Vorrichtung zur Herstellung von aus Kunststoff bestehenden Partikeln
DE69828426T2 (de) 1997-10-10 2005-12-01 Microbeads As Verfahren zur herstellung von polymerteilchen
WO1999058317A1 (fr) 1998-05-11 1999-11-18 Bayer Aktiengesellschaft Procede et materiau pour produire des corps-modeles
EP1092470A1 (fr) * 1999-10-11 2001-04-18 Foseco International Limited Sintern von Pulver zur Herstellung von Granulate
DE10122492A1 (de) 2001-05-10 2002-11-14 Bayer Ag Verfahren zur Herstellung von Polymerpulvern für das Rapid Prototyping
US20070172533A1 (en) * 2004-02-27 2007-07-26 Jmp Industries, Inc. Extruder system and cutting assembly
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