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WO2000006655A1 - Procede et dispositif d'extrusion - Google Patents

Procede et dispositif d'extrusion Download PDF

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Publication number
WO2000006655A1
WO2000006655A1 PCT/EP1999/005016 EP9905016W WO0006655A1 WO 2000006655 A1 WO2000006655 A1 WO 2000006655A1 EP 9905016 W EP9905016 W EP 9905016W WO 0006655 A1 WO0006655 A1 WO 0006655A1
Authority
WO
WIPO (PCT)
Prior art keywords
extruder
compressed gas
substances
extrusion process
substance
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/EP1999/005016
Other languages
German (de)
English (en)
Inventor
Thomas Berger
Oliver Dietrich
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.)
Messer Griesheim GmbH
Original Assignee
Messer Griesheim 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 Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Priority to EP99941427A priority Critical patent/EP1100850A1/fr
Publication of WO2000006655A1 publication Critical patent/WO2000006655A1/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
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3469—Cell or pore nucleation
    • B29C44/348—Cell or pore nucleation by regulating the temperature and/or the pressure, e.g. suppression of foaming until the pressure is rapidly decreased
    • 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
    • B29C48/04—Particle-shaped
    • 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
    • B29C48/285—Feeding the extrusion material to the extruder
    • B29C48/29—Feeding the extrusion material to the extruder in liquid form
    • 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/83—Heating or cooling the cylinders
    • B29C48/832—Heating
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
    • B29C67/246—Moulding high reactive monomers or prepolymers, e.g. by reaction injection moulding [RIM], liquid injection moulding [LIM]
    • 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
    • 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
    • B29C48/285—Feeding the extrusion material to the extruder
    • B29C48/288—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules
    • 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
    • B29C48/285—Feeding the extrusion material to the extruder
    • B29C48/295—Feeding the extrusion material to the extruder in gaseous form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients

Definitions

  • the invention relates to a method and an apparatus for extruding.
  • thermoplastics and raw materials for thermosets in
  • Extrusion is a common processing and manufacturing process.
  • the substances or mixtures of substances to be processed are plasticized by an elevated temperature or by mechanical stress. Homogenization can also be achieved with mixtures of substances.
  • the mechanical and thermal stress on the substances can lead to undesired reactions. These cause product damage right through to plant downtime.
  • the extrusion processes are often very energy-intensive, since high drive power is required due to high viscosity and large amounts of heat are required due to high melting temperatures.
  • the binder and hardener components may react undesirably during extrusion. Often these product damages are not immediately recognizable and only cause considerable problems and additional costs when they are used later.
  • the extruded material usually requires further treatment steps.
  • the resulting melts are then often cooled and broken into chips. These are then ground and separated into the desired grain sizes by sieving or screening.
  • From WO 95/21688 it is known that the melting temperature of certain substances can be reduced by using highly compressed gases.
  • the substances to be treated are placed in a pressure vessel and pressurized with a gas under high pressure.
  • the resulting supercritical melt is then expanded, for example via a valve.
  • the melt is atomized and cooled.
  • a similar process is described in WO 94/09913 for the production of powder coatings. It is disadvantageous that this process is a batch process and that relatively high pressures (if carbon dioxide is used well above 200 bar) are necessary.
  • a large amount of gas must be able to dissolve in the product so that very low viscosities are achieved.
  • the amount of gas must be so large that the product is sufficiently atomized and cooled during the subsequent expansion.
  • the object of the invention is to provide a product-friendly extrusion process and at the same time to achieve a cooling and comminuting effect.
  • the object is achieved according to the invention by a method in which compressed gas is fed into the extruder during the extrusion process.
  • the reduced temperature level in the extruder leads to product protection. It is therefore also possible to extrude highly sensitive substances or mixtures of substances for which a conventional extrusion process is not suitable.
  • the lower viscosity of the substances also reduces the drive power required for the extruder and thus leads to energy savings.
  • the gas released causes atomization / comminution of the melt, or the expansion of the gas causes cooling / crystallization of the melt.
  • the product can only be foamed here.
  • a further gas supply for example with the help of a snow tube or a two-fluid nozzle, can be used to add to the missing amount of cold or to improve atomization.
  • the process according to the invention is a continuous processing process.
  • the expensive pressure vessels used in the mentioned patent applications WO 95/21688 and WO 94/09913 are not necessary here.
  • continuous processing can be better controlled, which offers advantages for product quality.
  • the compressed gas has a pressure of 50 to 500 bar, preferably 80 to 300 bar. Sufficiently large amounts of gas are released by this pressure. These are necessary for the viscosity changes.
  • the compressed gas has a temperature of 290 to 500 K, preferably 310 to 400 K. This temperature range means that substances can advantageously be processed at lower temperatures than in conventional extrusion processes, which is particularly gentle on the product.
  • the compressed gas is carbon dioxide, propane, isobutane, n-butane, ethane, nitrous oxide (N 2 O) and / or ammionac; preferably the compressed gas is liquid or supercritical carbon dioxide. These gases are particularly suitable because they can be easily dissolved into the fabric to be processed. Carbon dioxide is preferred because it is inexpensive, readily available and has an inert character.
  • the extruded substance or the mixture of substances contains raw materials which can be further processed to thermosets.
  • the extruded substance or mixture of substances consists of at least two components, preferably the components hardener and reactive thermoplastics (resins).
  • the particles of the extruded substance or the mixture of substances are separated from the gaseous constituents by a cyclone and / or filter downstream of the extrusion process.
  • the compressed gas is fed into the extruder and / or into the line downstream of the extruder and optionally before a cyclone and / or filter downstream of the extruder.
  • the object is further achieved by an apparatus for extruding substances or mixtures of substances, which has an extruder to which a device is assigned in order to feed compressed gas from a source for the compressed gas into the extruder during the extrusion process.
  • the device according to the invention has the advantage that the gas can be introduced in a targeted and product-specific manner.
  • the compressed gas is advantageously metered into the extruder at various points.
  • the device for supplying the compressed gas during the extrusion process into the extruder is assigned at least one heat exchanger and one compressor, preferably a compressor or a pump.
  • the temperature and pressure of the gas are advantageously set by the heat exchanger and compressor in accordance with the necessary process conditions.
  • a compressor or a pump have the advantage that they are easy to regulate and allow a high pressure level.
  • a diaphragm pump is preferably used.
  • the source of liquid carbon dioxide is a tank or one or more bottles or a bundle of bottles.
  • the extruder is followed by at least one cyclone and / or a filter. This advantageously separates the product from the gas.
  • the method and the device according to the invention are preferably used for the production of powdery or particulate substances, particularly preferably for the production of paints and lacquers, in particular powder lacquers.
  • the figure shows schematically a device according to the invention and various ways of supplying the gas.
  • the gas stream is fed to the extruder (12) through a line (10) and via a valve (11), the feed material, for example from a storage container (13), being introduced into the extruder (12) (arrow A) .
  • the gas supply to the extruder (12) can take place in different areas in the extruder (12) itself or outside the extruder into the material that has already been extruded.
  • the gas stream can thus be fed to the extruder in various areas via one or more lines (14, 15, 16) (see arrows B, C and D). It is also conceivable, alternatively or additionally, to feed the gas stream via a line (17) into a line (18) coming from the extruder to the material which has already been extruded (arrow E).
  • the flow of extruded material coming from the extruder (12) can be adjusted via a control and shut-off device (19).
  • the material coming from line (18) is fed to a cyclone (20).
  • the solids are fed out of the cyclone (20) via a line (21) into a container (22).
  • the gaseous constituents are passed from the cyclone (20) via a line (23) into a filter (24).
  • Solid substances are separated in the filter (24) and fed to a container (26) via a line (25).
  • the gaseous components from the filter (24) are discharged via a line (27). With an appropriate design of the cyclone (20) and / or the filter (24), these gaseous components can be passed directly into the open.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

Selon un procédé d'extrusion, du gaz comprimé est acheminé dans l'extrudeuse (12) pendant le processus d'extrusion. Un dispositif pour extruder des substances ou des mélanges de substances comporte une extrudeuse (12) à laquelle est associé un système pour acheminer, dans l'extrudeuse (12) pendant le processus d'extrusion, du gaz comprimé depuis une source (1) prévue à cet effet.
PCT/EP1999/005016 1998-07-25 1999-07-15 Procede et dispositif d'extrusion Ceased WO2000006655A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99941427A EP1100850A1 (fr) 1998-07-25 1999-07-15 Procede et dispositif d'extrusion

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833543A DE19833543A1 (de) 1998-07-25 1998-07-25 Verfahren und Vorrichtung zum Extrudieren
DE19833543.1 1998-07-25

Publications (1)

Publication Number Publication Date
WO2000006655A1 true WO2000006655A1 (fr) 2000-02-10

Family

ID=7875313

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/005016 Ceased WO2000006655A1 (fr) 1998-07-25 1999-07-15 Procede et dispositif d'extrusion

Country Status (3)

Country Link
EP (1) EP1100850A1 (fr)
DE (1) DE19833543A1 (fr)
WO (1) WO2000006655A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE50001875D1 (de) * 2000-07-07 2003-05-28 Wolfram Lihotzky-Vaupel Verfahren zur Herstellung von Granulat und Extruder
CN112873779B (zh) * 2021-03-15 2025-02-25 宿迁绿金人橡塑机械有限公司 一种连续制备低门尼反弹的小颗粒再生胶装置及方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994009913A1 (fr) 1992-11-02 1994-05-11 Ferro Corporation Procede de preparation de revetements
WO1995021688A1 (fr) 1994-02-15 1995-08-17 Eckhard Weidner Procede pour la fabrication de particules ou de poudres
JPH08113652A (ja) * 1994-08-24 1996-05-07 Nippon Paint Co Ltd 高分子微粒子の製造方法
US5766522A (en) * 1996-07-19 1998-06-16 Morton International, Inc. Continuous processing of powder coating compositions
EP0887389A1 (fr) * 1997-06-25 1998-12-30 Morton International, Inc. Traitement en continu de compositions de revêtement pulvérulente

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3316335A (en) * 1963-12-24 1967-04-25 Continental Can Co Method and apparatus for continuously extruding and foaming plastics
DE3910770C2 (de) * 1989-04-04 1995-02-16 Alkor Gmbh Verfahren zur Herstellung extrudierter oder blasgeformter ein- oder mehrschichtiger Kunststoffolien,- profile,- gegenstände oder- hohlkörper
DE3930847A1 (de) * 1989-09-15 1991-04-04 Berstorff Gmbh Masch Hermann Verfahren zum herstellen eines schaumstoffes aus thermoplastischem kunststoff und extruderanlage zur durchfuehrung des verfahrens

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994009913A1 (fr) 1992-11-02 1994-05-11 Ferro Corporation Procede de preparation de revetements
WO1995021688A1 (fr) 1994-02-15 1995-08-17 Eckhard Weidner Procede pour la fabrication de particules ou de poudres
JPH08113652A (ja) * 1994-08-24 1996-05-07 Nippon Paint Co Ltd 高分子微粒子の製造方法
US5766522A (en) * 1996-07-19 1998-06-16 Morton International, Inc. Continuous processing of powder coating compositions
EP0887389A1 (fr) * 1997-06-25 1998-12-30 Morton International, Inc. Traitement en continu de compositions de revêtement pulvérulente

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 09 30 September 1996 (1996-09-30) *

Also Published As

Publication number Publication date
EP1100850A1 (fr) 2001-05-23
DE19833543A1 (de) 2000-01-27

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