WO2000023497A1 - Procede de granulation et de cristallisation de polyesters ou copolyesters thermoplastiques - Google Patents

Procede de granulation et de cristallisation de polyesters ou copolyesters thermoplastiques Download PDF

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Publication number
WO2000023497A1
WO2000023497A1 PCT/EP1999/006617 EP9906617W WO0023497A1 WO 2000023497 A1 WO2000023497 A1 WO 2000023497A1 EP 9906617 W EP9906617 W EP 9906617W WO 0023497 A1 WO0023497 A1 WO 0023497A1
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WO
WIPO (PCT)
Prior art keywords
liquid
pellets
crystallization
polyester
strands
Prior art date
Application number
PCT/EP1999/006617
Other languages
German (de)
English (en)
Inventor
André MATTHAEI
Original Assignee
Rieter Automatik 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 Rieter Automatik Gmbh filed Critical Rieter Automatik Gmbh
Publication of WO2000023497A1 publication Critical patent/WO2000023497A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/12—Powdering or granulating
    • 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
    • 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
    • B29B9/16—Auxiliary treatment of granules
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/88—Post-polymerisation treatment
    • 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
    • B29B9/16—Auxiliary treatment of granules
    • B29B2009/165—Crystallizing granules
    • 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
    • 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
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0041—Crystalline
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/16—Dicarboxylic acids and dihydroxy compounds
    • C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
    • C08G63/181—Acids containing aromatic rings
    • C08G63/183—Terephthalic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds

Definitions

  • the invention relates to a method for granulating and crystallizing thermoplastic polyesters or copolyesters according to the preamble of claim 1 and devices for carrying out the method according to the features of claims 12, 13 and 14.
  • a process for the granulation and further treatment of a polyethylene terephthalate to form pellets is known from US Pat. No. 4,436,782, a liquid oligomer having a viscosity number (or intrinsic viscosity) of between 0.08 and 0.15 being formed at temperatures between 260 and 280 ° C.
  • Nozzles are pressed in such a way that drops are formed which fall through a cooling space with an inert gas atmosphere into a water bath in order to solidify the drops into amorphous pellets.
  • a drum or a conveyor belt can catch the drops in order to cool and solidify them into amorphous pellets.
  • amorphous pellets are formed as precursors in the liquid provided, namely water, for solidifying a weakly polycondensed polyester, such as polyethylene terephthalate, which have to be converted into crystalline precursors by a further energetically and economically complex step.
  • a weakly polycondensed polyester such as polyethylene terephthalate
  • US Pat. No. 5,540,868 how crystalline pellets can be produced from amorphous polyester using different granulation processes.
  • the amorphous polyester precursor must be heated to temperatures above 70 ° C in order to trigger the crystallization process.
  • amorphous polyester at temperatures above 70 ° C has the disadvantage that it has a sticky surface.
  • the preliminary product In order to prevent the amorphous polyester from sticking or clumping together at crystallization temperatures above 70 ° C., the preliminary product must be in the form of granules and can be kept in motion in a fluidized bed reactor by means of appropriate hot gas streams until at least the surface is crystallized to such an extent that the sticking together Intermediate products are excluded.
  • the crystallization process of the precursors is usually combined with the further reinforced polycondensation, which is usually carried out between 200 and 230 ° C. in a fluidized bed reactor.
  • the reactor is operated in such a way that, in order to overcome the stickiness, crystallization is carried out at an optimal crystallization temperature of approximately 150 ° C. for several hours and then the pellets or granules are condensed to higher chain lengths at temperatures between 200 and 230 ° C. for further hours become.
  • the object of the invention is to provide a method for granulating and crystallizing thermoplastic polyesters and copolyesters according to the preamble of claim 1 and to provide devices according to the preamble of claims 12, 13 and 14 which overcome the disadvantages in the prior art, shorten the process of conventional granulation processes and build on previously known process steps and devices to produce at least surface-crystallized granules of partially polycondensed polyesters or copolyesters.
  • the intermediate product is introduced into a liquid which accelerates the crystallization process of the polyester and the crystallization state accelerated by keeping the liquid above 100 ° C or by the liquid generating nuclei on the surface of the intermediate.
  • This solution has the advantage that the disadvantages of gas heating or gas cooling are overcome by inserting a suitable liquid, with pure water having proven unsuitable in the prior art, since the heat capacity of liquids and the heat transfer resistance between partially polycondensed preliminary products and a liquid are much more effective than a gas environment from the prior art.
  • a baffle plate solution entails, in which the baffle plate temperature and the dwell time of the preliminary products on the baffle plate are essential in order to trigger and accelerate the crystallization process, are mixed with a liquid that is either kept above 100 ° C. or that itself produces crystallization nuclei on the surface of the intermediate product.
  • Such crystallization nuclei can already be achieved by dissolving the surface using suitable solvents for the partially polycondensed preliminary product.
  • the liquid does not have to be heated to the optimal crystallization temperature of approximately 150 ° C. or in the optimal temperature interval, as is apparent from the temperature equations in US Pat. No. 5,540,868, because such, through the liquid
  • the liquid is one of the volatile starting components and / or one of the volatile deposition components of a polycondensation.
  • the starting components are an ethylene glycol and a terephthalic acid or a dimethyl terephthalate
  • the volatile separation component of the polycondensation of polyethylene terephthalate essentially water and in some cases also ethylene glycol are separated off.
  • the liquid is preferably kept at a temperature in the range between 110 to 180 ° C.
  • Amorphous pellets which originate from a previous process step, can enter such a hot, temperature-controlled liquid bath and can be converted from the amorphous state to the crystalline state within this liquid bath and within this temperature interval, which is advantageous for crystallization.
  • Triethylene glycol is preferably used for higher temperature ranges, in which not only crystallization can advantageously be carried out alone, but also further polycondensation of the pellets can be triggered.
  • This triethylene glycol is contained in the liquid up to 100% if temperatures between 100 ° C and 230 ° C are preferably to be maintained.
  • liquids can be used that generate crystallization nuclei on the surface of the product. Therefore, an ethylene glycol, a triethylene glycol or mi up to a share of 100%. Such mixtures can be diluted with water or emulsified in water without significantly reducing the nucleation on the surface of the product.
  • crystallization particularly in the case of partially polycondensed polyethylene terephthalate, begins at a liquid temperature of 70 ° C and accelerates with increasing temperature
  • pure water can also be used in the temperature range between 70 and 100 ° C, so that there are no amorphous pellets as in water at room temperature form, but surface crystallized pellets can be produced.
  • spontaneous crystallization of the partially polycondensed polyethylene terephthalate cannot be expected for water baths at these temperatures.
  • the method can preferably be used not only for a polyethylene terephthalate (PET) but also for a polyester of the polytrimethyl terephthalate (PTT) type.
  • PET polyethylene terephthalate
  • PTT polytrimethyl terephthalate
  • the liquid components and the temperature ranges have to be adjusted accordingly for optimal crystallization.
  • the method according to the invention is preferably used in strand pelletizing.
  • the strands are pelletized before and / or after treatment with the liquid by firstly leaving the product in the form of polyester strands from a nozzle, immersing them in a first liquid bath, granulating into pellets and then immersing the pellets in a second liquid bath, whereby the polyester crystallizes in the liquid baths. If the strands are only cooled with the first liquid bath, they can be fed to a pelletizing device as non-sticky strands, so that subsequently non-stick pellets are immersed in a second liquid bath from a liquid according to the invention.
  • both the first and the second liquid bath can be kept at temperatures below 100 ° C. for crystallization, but only with a liquid that generates crystallization nuclei on the surface of the product.
  • strands are supplied to the pelletizing device which, due to the nucleation of the surface, are already surface-crystallized, which is why they do not stick together and therefore do not have to be cooled to temperatures below 70 ° C., especially since surface-crystallized polyester strands even at higher ones Do not stick temperatures above 70 ° C.
  • their crystallization process can be continued in a second liquid bath with a liquid according to the invention.
  • the liquid according to the invention can thus achieve a considerable reduction in the energy requirement of the overall process and the pellets are more suitable for further processing, which essentially consists in increasing the degree of polycondensation of the pellets, since crystallized surfaces have a reduced adhesive effect.
  • the method is preferably also used in a dropletization process, the product being transferred in drop form by suitable devices, the drops being fed to the liquid and the polyester of the drops crystallizing in the liquid according to the invention.
  • a dropletization process By converting the partially polycondensed polyester melt into a drop shape and the crystallization process immediately following in the liquid according to the invention, both the throughput of conventional processes can be increased and at the same time the process time compared to conventional processes be significantly shortened.
  • this method can be used to deliver crystallized granules of the most varied degrees of polycondensation, the degree of polycondensation being determined by the viscosity number (or intrinsic viscosity).
  • the method according to the invention can preferably be used for hot-cut pelletizing, a product emerging from a casting head being pelleted immediately upon exit, the pellets being fed to the liquid and crystallizing in this liquid.
  • Precrystallized or fully crystallized pellets are thus advantageously available for further processing and the energy balance is significantly improved compared to conventional processes, so that increased economy is achieved.
  • a device which has a casting head for transferring the melt into strands. Furthermore, the device has a cooling device for introducing the strands into a cooling liquid and a granulating unit for separating the strands into pellets, with a collecting device in which the liquid is applied to the pellets. Furthermore, a device for separating the liquid from the pellets and devices for processing and recycling the liquid ensure that the liquid is used optimally. For this purpose, there is a device for maintaining a temperature of the liquid above 100 ° C. and / or supply devices for introducing the liquid, which generates crystallization nuclei on the surfaces of the pellets, the liquid-contacting parts of the device having materials which are chemically and thermally resistant to own the liquid.
  • This device has the advantage that a high throughput of several tons per hour of the polyester to crystallized pellets can be achieved using the method according to the invention.
  • such devices have only been able to supply amorphous pellets that tend to stick together at temperatures above 70 ° C.
  • the partially polycondensed pellets have to be increased in a further time-consuming process that takes 8 to 12 hours high molecular weight polycondensates are further treated at temperatures between 200 and 230 ° C, about a third of this time being used by a holding interval at an optimal crystallization temperature of approximately 150 ° C to ensure non-sticking in further processing steps of the polycondensate.
  • a further preferred device for carrying out the method has a casting head, which is immediately followed by a hot-cutting device for pelleting the material emerging from the casting head to form pellets.
  • a collecting device acts on the pellets with the liquid according to the invention, and a device for separating the liquid from the pellets and a device for preparing and returning the liquid ensure that the liquid can be used economically.
  • the device has a device for maintaining a temperature of the liquid above 100 ° C. and / or feed devices for introducing liquids which produce crystallization nuclei on the surfaces of the pellets.
  • the parts of the device in contact with the liquid have materials which have chemical and thermal resistance to the liquid.
  • the pre-crystallization by the liquid according to the invention also has an effect on the overall throughput of such a system here, since hours of post-crystallization in the subsequent processing steps can be dispensed with.
  • Another preferred device for carrying out the method has a pouring head which forms drop-shaped pellets by suitable measures such as vibration, spraying or spinning.
  • the liquid according to the invention is applied to the pellets in a collecting device and a device for separating the liquid from the pellets and a further device for processing and recycling the liquid ensure optimal use of the liquid according to the invention.
  • this device also has a device for maintaining a temperature of the liquid above 100 ° C. and / or feed devices for introducing liquids which produce crystallization nuclei on the surfaces of the pellets, and parts of the device which come into contact with liquid are formed from materials which are chemical and have thermal resistance to the liquid.
  • This device also shows advantageously that with the introduction of the liquid according to the invention, the device becomes significantly more effective, especially since the heat of fusion contained in the drops is directly converted into heat of crystallization in the liquid, so that langandauera.de recrystallization within the scope of the subsequent device components can be avoided.
  • a polyethylene terephthalate (PET) with a viscosity number (or intrinsic viscosity) of 0.6 is discharged at a temperature of 285 ° C. through a caster and formed into a large number of individual strands. These strands are fed to a cooling bath of water at 20 ° C. In this water bath, the strands are cooled to a cutable state during a dwell time of approximately 0.4 s.
  • PET polyethylene terephthalate
  • the strands are pelletized in a strand granulator.
  • the pellets arrive as a product in a second liquid bath, which is filled with triethyl glycol (TEG) and is kept at a temperature of 150 ° C.
  • TOG triethyl glycol
  • the residence time in this second bath is 10 minutes for the pellets.
  • the crystallized pellets are then fed to the liquid separator and the degree of crystallization of the pellets is measured at 80%.
  • dynamic differential calorimetry or dynamic scanning calorimetry DSC
  • a polyethylene terephthalate with a low viscosity number of 0.15 is discharged from a casting nozzle at a melt temperature of 250 ° C.
  • the nozzle diameter is 0.5 mm each.
  • the emerging melt strands are dripped by vibration. This creates drops with a diameter of approximately 1.2 mm. After a distance of approx. 10 cm, these fall into a liquid bath filled with ethylene glycol (EG) at 20 ° C, in which they indicate crystallization after a dwell time of fractions of a second by changing the color from transparent to white. DSC measurements show degrees of crystallization of 100%.
  • EG ethylene glycol
  • a melt of a thermoplastic polyester after a partial polycondensation with a viscosity number of 0.3 is discharged as pellets in a hot-cutting device and the liquid according to the invention is applied in a collecting device.
  • the liquid is kept at a temperature of approx. 140 to 160 ° C and consists essentially of triethyl glycol (TEG).
  • TEG triethyl glycol
  • PET polyethylene terephthalate
  • a melt made of polyethylene terephthalate is converted into strands by means of a casting head.
  • the strands pass through a pre-cooling device for 0.4 s, which is filled with a liquid containing ethylene glycol.
  • the ethylene glycol liquid is kept at approx. 50 ° C., so that the strands cool and crystallization nuclei form on their surfaces at the same time.
  • the strands pretreated in this way are fed to a granulating unit for separating the strands into pellets.
  • the resulting pellets are then fed to a collecting device which is filled with triethylene glycol, which is kept at a temperature between 130 and 160 ° C.
  • the pellets remain in the collecting device for a further 5 minutes and are then fed to the device for separating the liquid from the pellets, in which the liquid is recovered for further processing and recycling.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (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 procédé de granulation et de cristallisation de polyesters et copolyesters thermoplastiques ainsi qu'un dispositif permettant la mise en oeuvre de ce procédé. Les polyesters ou copolyesters sont introduits dans un liquide après polycondensation partielle pour obtenir un précurseur. Une fois le précurseur introduit dans le liquide, ce liquide accélère l'opération de cristallisation du polyester, entraînant plus rapidement l'état de cristallisation. Le liquide est conservé à une température supérieure à 100 °C ou le liquide produit des germes de cristallisation à la surface du précurseur.
PCT/EP1999/006617 1998-10-20 1999-09-08 Procede de granulation et de cristallisation de polyesters ou copolyesters thermoplastiques WO2000023497A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19848245A DE19848245A1 (de) 1998-10-20 1998-10-20 Verfahren zur Granulierung und Kristallisation von thermoplastischen Polyestern oder Copolyestern
DE19848245.0 1998-10-20

Publications (1)

Publication Number Publication Date
WO2000023497A1 true WO2000023497A1 (fr) 2000-04-27

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DE (1) DE19848245A1 (fr)
WO (1) WO2000023497A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10149474A1 (de) * 2001-10-08 2003-04-17 Buehler Ag Steuerung der Kristallisation von Polyestern durch deren Wassergehalt
US7250486B1 (en) 2004-12-15 2007-07-31 Uop Llc Method and apparatus for crystallizing polymer particles
US7585104B2 (en) 2005-09-12 2009-09-08 Uop Llc Rotary processor
US7674877B2 (en) 2003-09-18 2010-03-09 Eastman Chemical Company Thermal crystallization of polyester pellets in liquid
WO2010094807A1 (fr) 2009-02-23 2010-08-26 Bühler AG Procédé de fabrication de particules de polyester sur une ligne à fort débit
US7875184B2 (en) 2005-09-22 2011-01-25 Eastman Chemical Company Crystallized pellet/liquid separator
US8039581B2 (en) 2003-10-10 2011-10-18 Grupo Petrotemex, S.A. De C.V. Thermal crystallization of a molten polyester polymer in a fluid
US8080196B2 (en) 2008-02-12 2011-12-20 Gala Industries, Inc. Method and apparatus to achieve crystallization of polymers utilizing multiple processing systems
US8324339B2 (en) 2003-10-17 2012-12-04 Eastman Chemical Company Method and apparatus for thermally processing polyester pellets
US8366428B2 (en) 2003-11-21 2013-02-05 Gala Industries, Inc. Method and apparatus for making crystalline pet pellets
US9259857B2 (en) 2008-02-12 2016-02-16 Gala Industries, Inc. Method and apparatus to condition polymers utilizing multiple processing systems

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AU2003266199A1 (en) 2002-10-04 2004-05-04 Kreyenborg Verwaltungen Und Beteiligungen Gmbh And Co. Kg Method for granulating plastics
DE10349016B4 (de) * 2003-10-17 2005-10-20 Bkg Bruckmann & Kreyenborg Granuliertechnik Gmbh Verfahren zur Wärmebehandlung von Pellets aus PET
DE202004002870U1 (de) 2004-02-25 2004-05-19 Bauerfeind Ag Einlegesohle
DE102004014590A1 (de) * 2004-03-23 2005-10-20 Buehler Ag Teilkristallines Polyethylenterephthalat
EP1753589A1 (fr) * 2004-05-26 2007-02-21 Treofan Germany GmbH & Co.KG Procede de cristallisation de granules en matieres plastiques amorphes
US20060047102A1 (en) * 2004-09-02 2006-03-02 Stephen Weinhold Spheroidal polyester polymer particles
US8079158B2 (en) 2004-09-02 2011-12-20 Grupo Petrotemex, S.A. De C.V. Process for separating and drying thermoplastic particles under high pressure
DE102005008115A1 (de) * 2005-02-21 2006-08-31 Mann + Hummel Protec Gmbh Verfahren zum Kristallisieren eines amorphen Kunststoffgranulates
DE102006027176B4 (de) * 2005-08-26 2015-08-06 Lurgi Zimmer Gmbh Verfahren und Vorrichtung zur Verringerung des Acetaldehydgehaltes von Polyestergranulat sowie Polyestergranulat
CH711770B1 (de) 2006-03-13 2017-05-15 Uhde Inventa-Fischer Ag Verfahren zur Herstellung eines nicht klebenden Granulats aus einem Polyestermaterial und zur Weiterverarbeitung eines so hergestellten Granulats.
EP2043831B1 (fr) * 2006-07-21 2013-02-27 Bühler AG Procédé de cristallisation d'un polymère cristallisant lentement et granulés polymères
DE102007012450A1 (de) 2007-03-15 2008-09-18 Rieter Automatik Gmbh Verfahren zur Granulierung und Kristallisation von thermoplastischen Polymeren
DE102008061748A1 (de) 2008-12-12 2010-06-24 Treofan Germany Gmbh & Co. Kg Mehrschichtige mikroporöse Folie für Batterien mit Abschaltfunktion
DE102008061746A1 (de) 2008-12-12 2010-06-24 Treofan Germany Gmbh & Co. Kg Einschichtige mikroporöse Folie für Batterien mit Abschaltfunktion
DE102010007163A1 (de) 2010-02-08 2011-08-11 Automatik Plastics Machinery GmbH, 63762 Verfahren zur Herstellung von Granulatkörnern von Polyethylenterephthalat

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10149474A1 (de) * 2001-10-08 2003-04-17 Buehler Ag Steuerung der Kristallisation von Polyestern durch deren Wassergehalt
US7674877B2 (en) 2003-09-18 2010-03-09 Eastman Chemical Company Thermal crystallization of polyester pellets in liquid
US8039581B2 (en) 2003-10-10 2011-10-18 Grupo Petrotemex, S.A. De C.V. Thermal crystallization of a molten polyester polymer in a fluid
US8309683B2 (en) 2003-10-10 2012-11-13 Grupo Petrotemex, S.A. De C.V. Thermal crystallization of a molten polyester polymer in a fluid
US8324339B2 (en) 2003-10-17 2012-12-04 Eastman Chemical Company Method and apparatus for thermally processing polyester pellets
US9492948B2 (en) 2003-11-21 2016-11-15 Gala Industries, Inc. Method and apparatus for making crystalline pet pellets
US8366428B2 (en) 2003-11-21 2013-02-05 Gala Industries, Inc. Method and apparatus for making crystalline pet pellets
US7622061B2 (en) * 2004-12-15 2009-11-24 Uop Llc Apparatus for crystallizing polymer particles
US7514527B2 (en) 2004-12-15 2009-04-07 Uop Llc Method and apparatus for crystallizing polymer particles
US7250486B1 (en) 2004-12-15 2007-07-31 Uop Llc Method and apparatus for crystallizing polymer particles
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