DE10349016A1 - Thermally processing polyester pellets, e.g. polyethylene terephthalate pellets, comprises feeding polyester melt to underwater pelletizer, feeding pellets to water/solids separating device, and feeding dried pellets to agitation device - Google Patents

Thermally processing polyester pellets, e.g. polyethylene terephthalate pellets, comprises feeding polyester melt to underwater pelletizer, feeding pellets to water/solids separating device, and feeding dried pellets to agitation device Download PDF

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Publication number
DE10349016A1
DE10349016A1 DE10349016A DE10349016A DE10349016A1 DE 10349016 A1 DE10349016 A1 DE 10349016A1 DE 10349016 A DE10349016 A DE 10349016A DE 10349016 A DE10349016 A DE 10349016A DE 10349016 A1 DE10349016 A1 DE 10349016A1
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Germany
Prior art keywords
pellets
feeding
polyester
water
heat treatment
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DE10349016A
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German (de)
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DE10349016B4 (en
Inventor
Theodor Bruckmann
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BKG Bruckmann and Kreyenborg Granuliertechnik GmbH
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BKG Bruckmann and Kreyenborg Granuliertechnik GmbH
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34584736&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DE10349016(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by BKG Bruckmann and Kreyenborg Granuliertechnik GmbH filed Critical BKG Bruckmann and Kreyenborg Granuliertechnik GmbH
Priority to DE10349016A priority Critical patent/DE10349016B4/en
Priority to EP04762623A priority patent/EP1608696B1/en
Priority to BRPI0409489-1A priority patent/BRPI0409489A/en
Priority to CA002515692A priority patent/CA2515692A1/en
Priority to DE502004000842T priority patent/DE502004000842D1/en
Priority to AT04762623T priority patent/ATE330985T1/en
Priority to RU2005130773/04A priority patent/RU2292362C2/en
Priority to ES04762623T priority patent/ES2267075T3/en
Priority to JP2006508127A priority patent/JP4724654B2/en
Priority to PL04762623T priority patent/PL1608696T3/en
Priority to PCT/DE2004/001778 priority patent/WO2005044901A1/en
Priority to CNB2004800053681A priority patent/CN100396719C/en
Priority to KR1020057016496A priority patent/KR100725291B1/en
Priority to MXPA05013108A priority patent/MXPA05013108A/en
Priority to US10/962,614 priority patent/US8324339B2/en
Publication of DE10349016A1 publication Critical patent/DE10349016A1/en
Publication of DE10349016B4 publication Critical patent/DE10349016B4/en
Application granted granted Critical
Priority to US11/888,229 priority patent/US20080071061A1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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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
    • B29B9/16—Auxiliary treatment of granules
    • 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
    • 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

Abstract

Thermally processing polyester pellets to achieve partial crystallization, comprises feeding polyester melt to underwater pelletizer and pelletizing polyester melt in pelletizer to obtain pellets; feeding pellets to a water/solids separating device to dry the pellets; feeding dried pellets at pellet temperature of greater than 100[deg]C to an agitation device; and removing pellets from the agitation device at a pellet temperature of over 80[deg]C. An independent claim is also included for an apparatus for thermal processing of polyester pellets to achieve partial crystallization of pellets, comprising melt pump (14); screen changer (12); underwater pelletizer (2); water/solids separating device (3); and conveyor device (4) for transporting pellets, and arranged downstream of the underwater pelletizer and the water/solids separating device. The conveyor device is constructed and arranged to agitate pellets and crystallize pellets during transport through specific heat of the pellets.

Description

Die Erfindung betrifft ein Verfahren nach dem Oberbegriff des Anspruches 1.The The invention relates to a method according to the preamble of the claim 1.

Derartige Verfahren sind aus der Praxis bekannt. Beispielsweise bei der Herstellung von Pellets aus PET ist eine sogenannte Kristallisationsphase oder Nachkristallisation im Anschluß an die Pelletbildung erforderlich. Bei einer Stranggranulation liegt die Temperatur der Pellets üblicherweise unterhalb von 70°, um auf diese Weise sicherzustellen, daß der Strang, wenn er in die einzelnen Pellets zerteilt wird, eine ausreichende Festigkeit aufweist, die eine derartige Zerteilung sowie eine anschließende Formstabilität der einzelnen Pellets überhaupt erst ermöglicht.such Methods are known in practice. For example, in the production of pellets of PET is a so-called crystallization phase or Postcrystallization following pellet formation is required. In a strand pelletizing is the Temperature of the pellets usually below 70 °, so as to ensure that the strand, when in the individual pellets, has sufficient strength, the such a division and subsequent dimensional stability of the individual Pellets at all only possible.

Da die Nachkristallisation bei einem gegenüber dieser Eigentemperatur der Pellets erhöhten Temperaturniveau stattfindet, sind aufwendige und insbesondere energieintensive Einrichtungen erforderlich, um die Pellets auf die gewünschte hohe Kristallisationstemperatur zu bringen. Dabei ist nicht nur der Energieaufwand zur Einhaltung des erforderlichen Temperaturniveaus nachteilig, sondern insbesondere ist ein apparativer Aufwand dafür erforderlich, um bei diesem hohen Temperaturniveau ein Verkleben der einzelnen Pellets miteinander zu vermeiden.There the recrystallization at one compared to this temperature the pellets increased temperature level takes place, are complex and especially energy-intensive facilities required to bring the pellets to the desired high crystallization temperature bring to. It is not only the energy consumption for compliance the required temperature level disadvantageous, but in particular is an expenditure on equipment required to stick at this high temperature level to avoid the individual pellets together.

Der Erfindung liegt die Aufgabe zugrunde, ein gattungsgemäßes Verfahren dahingehend weiter zu entwickeln, daß die Wärmebehandlung von Pellets mit möglichst einfachen Mitteln erzielt werden kann.Of the Invention is based on the object, a generic method to further develop that the heat treatment of pellets with preferably simple means can be achieved.

Diese Aufgabe wird durch ein Verfahren mit den Mitteln des Anspruches 1 gelöst.These Task is by a method with the means of the claim 1 solved.

Die Erfindung schlägt mit anderen Worten vor, den Pellets bei ihrer Bildung ein ausreichendes Energieniveau, also einen ausreichenden Wärmeinhalt mitzugeben, der anschließend ein selbsttätiges „Nachreifen" ermöglicht, also eine Wärmebehandlung der Pellets, die im wesentlichen durch ihre ihnen innewohnende Wärmeenergie ermöglicht wird. Beispielsweise können die Pellets an ihrer Oberfläche abgekühlt sein, um eine Formstabilität der Pellets zu ermöglichen. Wenn die Pellets anschließend nicht intensiv abgekühlt werden, so reicht die in den Pellets vorhandene Wärmeenergie aus, um einerseits die Oberflächentemperatur der Pellets langsam ansteigen zu lassen und andererseits die gewünschte Wärmebehandlung durchzuführen.The Invention proposes in other words, the pellets have a sufficient energy level as they form So a sufficient heat content follow, then an automatic "ripening" allows So a heat treatment the pellets, which are essentially due to their inherent thermal energy allows becomes. For example, you can the pellets have cooled down on their surface, for a dimensional stability to allow the pellets. If the pellets subsequently not cooled intensively become, then the heat energy present in the pellets enough on the one hand the surface temperature the pellets slowly rise and on the other hand, the desired heat treatment perform.

Bezogen auf das eingangs genannte Beispiel kann beispielsweise ein heißer Kunststoff mit einer Temperatur von beispielsweise 130–180° zu Pellets geformt werden, z. B. ein PET-Kunststoff mittels der an sich bekannten Unterwassergranulation. Während ihrer Verweildauer im Wasser kühlt sich die Oberflächentemperatur der Pellets beispielsweise auf einen Wert von etwa 110° ab, während die Kerntemperatur in den Pellets deutlich höher liegt. Werden nun die Pellets vom Wasser getrennt, beispielsweise in an sich bekannter Weise wie durch einen Zentrifugaltrockner, so wird die weitere, vergleichsweise intensive Auskühlung der Pellets unterbrochen, da die Pellets an umgebende Luft ihre Wärmeenergie weniger schnell geben als an umgebendes Wasser.Based to the example mentioned above, for example, a hot plastic be formed into pellets at a temperature of for example 130-180 °, z. B. a PET plastic by means of the known underwater granulation. During her Dwell time in the water cools itself the surface temperature The pellets, for example, to a value of about 110 °, while the Core temperature in the pellets is significantly higher. Now become the pellets separated from the water, for example in a conventional manner such as by a centrifugal dryer, the other, comparatively intense cooling The pellets interrupted as the pellets to their surrounding air Thermal energy give less quickly than to surrounding water.

Bei einer Verweildauer von mehreren Sekunden, vorzugsweise sogar mehreren Minuten, erfolgt nun eine langsame Erwärmung der Pellet-Oberfläche auf beispielsweise 140–150°, wodurch der gwünschte Effekt der Nachkristallisation eintritt, de auf einfache Weise durch die Farbänderung der Pellets angezeigt wird, die von einem zunächst glasigen Zustand in eine opak-weiße Färbung übergehen.at a residence time of several seconds, preferably even several Minutes, there is now a slow heating of the pellet surface for example 140-150 °, whereby he wished Effect of recrystallization occurs, de in a simple way by the color change The pellets appear from an initially glassy state into one opaque white Dyeing over.

Durch die Unterwasser-Granulation haben die erzielten Pellets automatisch eine etwa kugelförmige Gestalt: Im Vergleich zu stranggranulierten Pellets mit einer etwa zylindrischen Gestalt bieten die unterwassergranulierten Pellets untereinander eine erheblich kleinere Kontaktfläche, so daß die Gefahr einer Verklebung benachbarter Pellets gering ist. Dennoch kann unterstützend, um eine derartige Verklebung zu einem massiven Block zu verhindern, vorgesehen sein, die Pellets während ihrer Wärmebehandlung zu rütteln oder mit Vibrationen zu beaufschlagen. In einer vorteilhaften, preisgünstigen Ausgestaltung kann vorgesehen sein, die Pellets während ihrer Wärmebehandlung über einen Vibrationsförderer bzw. Schwingförderer zu befördern, so daß einerseits die Pellets zu einer nachgeschalteten Verarbeitungsanlage gefördert werden und andererseits durch die einwirkenden Vibrationen, die Verklebung der Pellets wirksam verhindert wird. Um eine ausreichende Verweildauer der Pellets für die Wärmebehandlung sicherzustellen, kann dabei vorteilhaft vorgesehen sein, statt eines Rinnenschwingförderers einen Wendelförderer zu verwenden. Durch Entnahme der Pellets, nachdem diese eine bestimmte Höhendifferenz zurückgelegt haben, kann in Abhängigkeit von dieser Höhendifferenz die Verweildauer der Pellets auf dem Wendelförderer beeinflußt werden, so daß eine ausreichende Verweildauer gewählt werden kann, um zuverlässig sicherzustellen, daß die Pellets anschließend ein Temperaturniveau aufweisen, welches eine Verklebung untereinander sicher ausschließt.By the underwater granulation have the obtained pellets automatically an approximately spherical Shape: Compared to extruded granules with an approximately The underwater pellets provide cylindrical shape each other a much smaller contact surface, so that the risk of bonding adjacent pellets is low. Nevertheless, supportive, um to prevent such bonding to a massive block be provided, the pellets during their heat treatment to shake or to apply vibrations. In an advantageous, inexpensive Embodiment may be provided, the pellets during their Heat treatment over one vibrating conveyor or vibratory conveyor to transport, so that on the one hand the pellets are conveyed to a downstream processing plant and on the other hand by the acting vibrations, the bonding of the Pellets is effectively prevented. For a sufficient length of stay the pellets for the heat treatment can be advantageously provided, instead of one Trough vibratory conveyor a spiral conveyor to use. By removing the pellets, after these a certain height difference traveled can, depending on this height difference the residence time of the pellets on the spiral conveyor are influenced, so that one adequate residence time chosen can be reliable To ensure that the Then pellets have a temperature level which is an adhesion to each other sure excludes.

Anstelle durch Vibrationen, kann ein Verkleben der Pellets auch dadurch erreicht werden, daß diese in einem Fluid verwirbelt werden. Ein derartiges Fluid kann beispielsweise Luft, ein Inertgas, oder auch eine Flüssigkeit wie Wasser sein.Instead of vibrations, a Verkle Ben of the pellets can also be achieved in that they are swirled in a fluid. Such a fluid may be, for example, air, an inert gas, or even a liquid such as water.

Weiterhin kann vorgesehen sein, die Pellets durch das Fluid an einem vorschnellen Auskühlen zu hindern, so daß das Fluid vorzugsweise wärmer ist als die Umgebungs-Raumtemperatur der Pellets. Gegebenenfalls kann die Temperatur des Fluids sogar höher sein als die Oberflächentemperatur der Pellets, um auf diese Weise sogar eine Wärmezufuhr vom Fluid in die Pellets zu ermöglichen, wobei der wirtschaftliche Vorteil nach wie vor darin liegt, daß die Pellets den größten Energieanteil für ihre Wärmebehandlung durch ihre Eigentemperatur selbst beitragen.Farther can be provided, the pellets through the fluid at a rash cooling down to prevent, so that the Fluid preferably warmer is the ambient room temperature of the pellets. Possibly For example, the temperature of the fluid may even be higher than the surface temperature the pellets, in order in this way even a supply of heat from the fluid in the To allow pellets the economic advantage is still that the pellets the largest share of energy for your heat treatment contribute by their own temperature.

Claims (10)

Verfahren zur Herstellung von Kunststoffgranulat, wobei Kunststoffpellets gebildet und zur Erzielung bestimmter Materialeigenschaften einer Wärmeeinwirkung über einen vorgegebenen Zeitraum ausgesetzt werden, dadurch gekennzeichnet, daß die Pellets mit einem für die Wärmebehandlung ausreichenden Wärmeinhalt gebildet werden, und anschließend für eine für die Wärmbehandlung ausreichende Dauer nicht oder nur so geringfügig abgekühlt werden, daß die Wärmebehandlung im wesentlichen mittels der in den Pellets vorhandenen Eigenwärme erfolgt.A process for the production of plastic granules, wherein plastic pellets are formed and exposed to achieve certain material properties of heat over a predetermined period of time, characterized in that the pellets are formed with a heat content sufficient for the heat treatment, and then for a sufficient time for the heat treatment or not be cooled only slightly so that the heat treatment is carried out essentially by means of the existing in the pellets own heat. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Pellets während der Wärmebehandlung gerüttelt oder vibriert werden.Method according to claim 1, characterized in that that the Pellets during the heat treatment shaken or vibrated. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Pellets während der Wärmebehandlung von einem Fluid durchströmt werden.Method according to claim 1 or 2, characterized that the Pellets during the heat treatment flows through by a fluid become. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß die Pellets durch das Fluid verwirbelt werden.Method according to claim 3, characterized that the Pellets are fluidized by the fluid. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß das Fluid wärmer als die Raumtemperatur ist.Method according to claim 3, characterized that this Fluid warmer as the room temperature is. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Pellets etwa kugel- oder linsenförmig ausgeformt werden.Method according to one of the preceding claims, characterized characterized in that Pellets about spherical or lenticular be formed. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Pellets durch Unterwasser-Granulation gebildet werden.Method according to one of the preceding claims, characterized characterized in that Pellets by underwater granulation be formed. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß PET als Kunststoff verwendet wird.Method according to one of the preceding claims, characterized marked that PET used as plastic. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Pellets eine anfängliche Oberflächentemperatur von wenigstens 110°C aufweisen, wenn die Wärmebehandlung erfolgt.Method according to one of the preceding claims, characterized characterized in that Pellets an initial surface temperature of at least 110 ° C when the heat treatment is performed. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Wärmebehandlung für eine Zeitdauer von wenigstens 10 Sekunden erfolgt.Method according to one of the preceding claims, characterized characterized in that heat treatment for one Duration of at least 10 seconds.
DE10349016A 2003-10-17 2003-10-17 Process for the heat treatment of pellets made of PET Revoked DE10349016B4 (en)

Priority Applications (16)

Application Number Priority Date Filing Date Title
DE10349016A DE10349016B4 (en) 2003-10-17 2003-10-17 Process for the heat treatment of pellets made of PET
JP2006508127A JP4724654B2 (en) 2003-10-17 2004-08-07 Method and apparatus for heat treatment of polyester pellets
PCT/DE2004/001778 WO2005044901A1 (en) 2003-10-17 2004-08-07 Method for the thermal treatment of polyester pellets
CA002515692A CA2515692A1 (en) 2003-10-17 2004-08-07 Method for the thermal treatment of polyester pellets
DE502004000842T DE502004000842D1 (en) 2003-10-17 2004-08-07 METHOD FOR THE THERMAL TREATMENT OF POLYESTER PELLETS
AT04762623T ATE330985T1 (en) 2003-10-17 2004-08-07 METHOD FOR THE THERMAL TREATMENT OF POLYESTER PELLETS
RU2005130773/04A RU2292362C2 (en) 2003-10-17 2004-08-07 Method of the thermal treatment of the polyethylene terephthalate granules and the device for the method realization
ES04762623T ES2267075T3 (en) 2003-10-17 2004-08-07 THERMAL TREATMENT PROCEDURE OF POLYESTER GRANULATES.
EP04762623A EP1608696B1 (en) 2003-10-17 2004-08-07 Method for the thermal treatment of polyester pellets
PL04762623T PL1608696T3 (en) 2003-10-17 2004-08-07 Method for the thermal treatment of polyester pellets
BRPI0409489-1A BRPI0409489A (en) 2003-10-17 2004-08-07 procedure for thermal processing of polyester spheres and device for performing such procedure
CNB2004800053681A CN100396719C (en) 2003-10-17 2004-08-07 Method for the thermal treatment of polyester pellets
KR1020057016496A KR100725291B1 (en) 2003-10-17 2004-08-07 Method for the thermal treatment of polyester pellets
MXPA05013108A MXPA05013108A (en) 2003-10-17 2004-08-07 Method for the thermal treatment of polyester pellets.
US10/962,614 US8324339B2 (en) 2003-10-17 2004-10-13 Method and apparatus for thermally processing polyester pellets
US11/888,229 US20080071061A1 (en) 2003-10-17 2007-07-31 Method and apparatus for thermally processing polyester pellets and a corresponding pellet preparation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE10349016A DE10349016B4 (en) 2003-10-17 2003-10-17 Process for the heat treatment of pellets made of PET

Publications (2)

Publication Number Publication Date
DE10349016A1 true DE10349016A1 (en) 2005-06-16
DE10349016B4 DE10349016B4 (en) 2005-10-20

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DE10349016A Revoked DE10349016B4 (en) 2003-10-17 2003-10-17 Process for the heat treatment of pellets made of PET

Country Status (2)

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CN (1) CN100396719C (en)
DE (1) DE10349016B4 (en)

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US8562882B2 (en) 2006-12-11 2013-10-22 Bühler AG Method for producing homogeneously crystallized polycondensate pellets
EP2712881A1 (en) 2012-09-26 2014-04-02 Bühler Thermal Processes AG Method and apparatus for directly crystallisation of polymers under inert gas
EP3363841A1 (en) 2017-02-17 2018-08-22 Polymetrix AG Method and device for direct crystallisation of polycondensates
EP3650186A1 (en) 2018-11-08 2020-05-13 Polymetrix AG Method and device for direct crystallisation of polycondensates
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