EP0526701B1 - Cooling mixer for powdery or granular plastic material and method for its operation - Google Patents
Cooling mixer for powdery or granular plastic material and method for its operation Download PDFInfo
- Publication number
- EP0526701B1 EP0526701B1 EP92108572A EP92108572A EP0526701B1 EP 0526701 B1 EP0526701 B1 EP 0526701B1 EP 92108572 A EP92108572 A EP 92108572A EP 92108572 A EP92108572 A EP 92108572A EP 0526701 B1 EP0526701 B1 EP 0526701B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mixing
- container
- cooling
- cooling mixer
- rotation
- 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.)
- Expired - Lifetime
Links
- 238000001816 cooling Methods 0.000 title claims description 29
- 239000000463 material Substances 0.000 title claims description 23
- 238000000034 method Methods 0.000 title claims description 4
- 239000004033 plastic Substances 0.000 title claims description 4
- 229920003023 plastic Polymers 0.000 title claims description 4
- 238000002156 mixing Methods 0.000 claims description 41
- 239000002826 coolant Substances 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/05—Stirrers
- B01F27/07—Stirrers characterised by their mounting on the shaft
- B01F27/072—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis
- B01F27/0724—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis directly mounted on the rotating axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F35/92—Heating or cooling systems for heating the outside of the receptacle, e.g. heated jackets or burners
Definitions
- the invention relates to a cooling mixer for powder and granular plastics and other free-flowing material according to the preamble of claim 1.
- Mixers of this type are used in particular for cooling plastics prepared in heating mixers in order to avoid a possible and undesirable change in the properties produced by the preparation at high temperatures.
- Known cooling mixers with mixing tools rotating around a vertical axis of rotation have double-walled containers through which a cooling medium, preferably water, flows when the mixer is operating, the minimum height of which corresponds approximately to their diameter.
- a cooling medium preferably water
- the mixing tool In order to use the total surface area of the cooling mixer even approximately for cooling the material to be mixed, the mixing tool is operated at a high peripheral speed, with the result that additional heat is supplied to the mixing chamber due to friction occurring within the material to be mixed and between the material to be mixed and the mixer and the inner region of the tank bottom as a result the centrifugal force acting on the mix only contributes insufficiently to the cooling of the mix.
- the invention is therefore based on the object of designing cooling mixers of the type mentioned at the outset in such a way that better use is made of the cooled surfaces by changing the position of the particles to be mixed more quickly without supplying the mixing chamber with a considerable amount of frictional heat.
- the advantages achieved by the invention consist in an intensive, not obstructed by built-in, circulation of the mixed material, which is forced to a primarily vertical circulation by the mixing blades and is thus cooled in addition to the cooling on the container bottom and on the container jacket and also on the container lid. Since there is no need for coolable fittings, the mixer can be cleaned and a worn mixing tool can be replaced easily.
- an embodiment of the invention is provided according to claim 4, since it has been shown that contrary to the peripheral speed of 5.5 to 6.5 m / sec, which is considered necessary for a good mixture circulation. a much lower one of about 1 to 3 m / sec. the cooling capacity transferred from the cooling surfaces to the mix is not reduced. Since the accelerations given to the particles of the material to be mixed during mixing are low, the cooling process is extremely gentle on the material. The particles do not stick to one another, nor do they adhere to parts of the mixer.
- the cylindrical housing 1 of the cooling mixer shown in vertical section in FIG. 1 is fastened on a base frame 2 and closed with a cover 3 which is double-walled and provided with coolant connections. It is double-walled, provided with coolant connections and accommodates the centrally arranged mixing tool 4, which rotates around a vertical axis of rotation.
- the mixing blades 6, 7 With the hub 5 of the mixing tool 4, the mixing blades 6, 7 are rigidly connected, the arrangement of which relative to one another is clear from FIG. 2.
- the mixing blades 6 have an approximately constant curvature as seen from the moving material over their entire length. They are tilted relative to the hub axis by an angle of approximately 45 ° in the direction of rotation of the mixing tool 4 (FIG.
- the sections 7a of the mixing blades 7, which are designed as flat sheets, are also tilted on the hub 5, analogously to the mixing blades 6 (FIG. 4).
- the vertically arranged scrapers 7b connected to the sections 7a extend in the immediate vicinity of the bottom, the wall and the lid of the container and form an angle of approximately 45 ° with the sections 7a in the plan view.
- the cooling mixer is filled with material to be mixed to 50 to 90% of the usable volume of the mixing chamber via the loading opening located in the middle of the cover 3.
- the housing 1 and the cover 3 are flowed through by cooling water.
- the mixing tool 4 is driven at a peripheral speed of approximately 1 m / sec. operated. At this low peripheral speed compared to known peripheral speeds, the mixing material is circulated from the inside to the outside, and vice versa, and in the vertical direction as a result of the corresponding mixing wing design.
- the material to be mixed is removed from the mixer at the emptying opening 8 located in the bottom of the container in the area of the scrapers 7b.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Accessories For Mixers (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Description
Die Erfindung betrifft einen Kühlmischer für pulver- und granulatförmige Kunststoffe und anderes rieselfähiges Gut nach dem Oberbegriff des Anspruchs 1.The invention relates to a cooling mixer for powder and granular plastics and other free-flowing material according to the preamble of
Derartige Mischer werden insbesondere zur Abkühlung von in Heizmischern aufbereiteten Kunststoffen verwendet, um eine bei hohen Temperaturen mögliche und unerwünschte Änderung der über die Aufbereitung erzeugten Eigenschaften zu vermeiden.Mixers of this type are used in particular for cooling plastics prepared in heating mixers in order to avoid a possible and undesirable change in the properties produced by the preparation at high temperatures.
Bekannte Kühlmischer mit um eine vertikale Drehachse umlaufenden Mischwerkzeugen weisen doppelwandig ausgebildete, bei Betrieb des Mischers von einem Kühlmedium, vorzugsweise Wasser, durchflossene Behälter auf, deren Minimalhöhe etwa ihrem Durchmesser entspricht.Known cooling mixers with mixing tools rotating around a vertical axis of rotation have double-walled containers through which a cooling medium, preferably water, flows when the mixer is operating, the minimum height of which corresponds approximately to their diameter.
Um die Gesamtmantelfläche des Kühlmischers auch nur annähernd für die Kühlung des Mischgutes zu nutzen, wird das Mischwerkzeug mit einer hohen Umfangsgeschwindigkeit betrieben, womit der Mischkammer durch innerhalb des Mischgutes und zwischen Mischgut und Mischer auftretender Reibung zusätzlich Wärme zugeführt wird und der innere Bereich des Behälterbodens infolge der auf das Mischgut wirkenden Zentrifugalkraft nur ungenügend zur Kühlung des Mischgutes beiträgt.In order to use the total surface area of the cooling mixer even approximately for cooling the material to be mixed, the mixing tool is operated at a high peripheral speed, with the result that additional heat is supplied to the mixing chamber due to friction occurring within the material to be mixed and between the material to be mixed and the mixer and the inner region of the tank bottom as a result the centrifugal force acting on the mix only contributes insufficiently to the cooling of the mix.
Auch ist bekannt, zur Vergrößerung der Kühlfläche kühlbare Einbauten im Behälterinneren vorzusehen.It is also known to provide coolable internals in the interior of the container in order to enlarge the cooling surface.
Derartige Einbauten behindern den durch die Mischwerkzeuge verursachten Zwangsumlauf des Mischgutes, was zu einem verlangsamten Positionswechsel der Partikel des Mischgutes und damit zu einer ungenügenden Ausnutzung der Kühlflächen, insbesondere des Behältermantels, führt. Durch die Reibung des Mischgutes an den Einbauten wird in der Mischkammer zusätzlich Wärme erzeugt.Such internals hinder the forced circulation of the mixed material caused by the mixing tools, which leads to a slower change in position of the particles of the mixed material and thus to insufficient use of the cooling surfaces, in particular the container jacket. The friction of the mix on the internals generates additional heat in the mixing chamber.
Der nach der DE-C 19 56 241 in seiner Form und seiner Anordnung im Behälter dem Zwangsumlauf des Mischgutes angepaßte doppelwandige Einbauring ermöglicht zwar einen gleichmäßigen Kontakt des Mischgutes zu dieser zusätzlichen Kühlfläche, trägt aber zur Verminderung der Reibung an derselben und zur effektiveren Ausnutzung der übrigen Kühlflächen nur unwesentlich bei.According to DE-C 19 56 241 in its shape and its arrangement in the container adapted to the forced circulation of the mix double-walled mounting ring allows a uniform contact of the mix to this additional cooling surface, but contributes to reducing the friction on the same and for more effective use of the rest Cooling surfaces only insignificantly.
Von daher liegt der Erfindung die Aufgabe zugrunde, Kühlmischer der eingangs genannten Art derart auszubilden, daß eine bessere Ausnutzung der gekühlten Flächen durch einen schnelleren Positionswechsel der zu mischenden Partikel erfolgt, ohne dabei der Mischkammer einen erheblichen Anteil an Reibungswärme zuzuführen.The invention is therefore based on the object of designing cooling mixers of the type mentioned at the outset in such a way that better use is made of the cooled surfaces by changing the position of the particles to be mixed more quickly without supplying the mixing chamber with a considerable amount of frictional heat.
Diese Aufgabe wird bei einem gattungsgemäßen Kühlmischer durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.This object is achieved in a generic cooling mixer by the characterizing features of
Die mit der Erfindung erzielten Vorteile bestehen in einer intensiven, nicht von Einbauten behinderten, Umwälzung des Mischgutes, das durch die Mischflügel zu einem vorrangig vertikalen Umlauf gezwungen und somit neben der Kühlung am Behälterboden und am Behältermantel auch am Behälterdeckel gekühlt wird. Da kühlbare Einbauten entfallen, ist eine Reinigung des Mischers und der Austausch eines verschlissenen Mischwerkzeuges leicht möglich.The advantages achieved by the invention consist in an intensive, not obstructed by built-in, circulation of the mixed material, which is forced to a primarily vertical circulation by the mixing blades and is thus cooled in addition to the cooling on the container bottom and on the container jacket and also on the container lid. Since there is no need for coolable fittings, the mixer can be cleaned and a worn mixing tool can be replaced easily.
Zur Verbesserung der Kühlleistung durch einen intensiveren Positionswechsel der Partikel des Mischgutes in radialer Richtung ist eine Ausgestaltung der Erfindung nach den Merkmalen der Ansprüche 2 und 3 vorgesehen.To improve the cooling performance through a more intensive change of position of the particles of the mixed material in the radial direction, an embodiment of the invention according to the features of
Zur Verringerung der der Mischkammer zugeführten Reibungswärme ist eine Ausgestaltung der Erfindung nach Anspruch 4 vorgesehen, da sich gezeigt hat, daß entgegen der für einen guten Mischgutumlauf als notwendig erachteten Umfangsgeschwindigkeit von 5,5 bis 6,5 m/sec. eine wesentlich geringere von etwa 1 bis 3 m/sec. die von den Kühlflächen auf das Mischgut übertragene Kühlleistung nicht vermindert.
Da die hierbei den Partikeln des Mischgutes beim Mischen erteilten Beschleunigungen gering sind, erfolgt der Kühlvorgang äußerst materialschonend. Es kommt weder zu einem Verkleben der Partikel untereinander, noch zu einem Anhaften dieser an Teilen des Mischers.In order to reduce the frictional heat supplied to the mixing chamber, an embodiment of the invention is provided according to claim 4, since it has been shown that contrary to the peripheral speed of 5.5 to 6.5 m / sec, which is considered necessary for a good mixture circulation. a much lower one of about 1 to 3 m / sec. the cooling capacity transferred from the cooling surfaces to the mix is not reduced.
Since the accelerations given to the particles of the material to be mixed during mixing are low, the cooling process is extremely gentle on the material. The particles do not stick to one another, nor do they adhere to parts of the mixer.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown in the drawing and will be described in more detail below.
Es zeigen
- Fig. 1
- einen Vertikalschnitt eines Kühlmischers,
- Fig. 2
- eine Draufsicht des Mischers bei geöffnetem Deckel,
- Fig. 3
- einen Schnitt der nach außen fördernden Mischflügel an der Linie A-A',
- Fig. 4
- einen Schnitt der nach innen fördernden Mischflügel an der Linie B-B'.
- Fig. 1
- a vertical section of a cooling mixer,
- Fig. 2
- a plan view of the mixer with the lid open,
- Fig. 3
- a section of the outward conveying mixing blades on the line A-A ',
- Fig. 4
- a section of the inward-promoting mixing blades on the line B-B '.
Das zylindrische Gehäuse 1 des in Fig. 1 im Vertikalschnitt dargestellten Kühlmischers ist auf einem Grundrahmen 2 befestigt und mit einem doppelwandig ausgebildeten, mit Kühlmittelanschlüssen versehenen Deckel 3 verschlossen.
Es ist doppelwandig ausgeführt, mit Kühlmittelanschlüssen versehen und nimmt das zentrisch angeordnete, um eine vertikale Drehachse umlaufende Mischwerkzeug 4 auf. Mit der Nabe 5 des Mischwerkzeuges 4 sind die Mischflügel 6,7 starr verbunden, deren Anordnung zueinander aus Fig. 2 deutlich wird. Die Mischflügel 6 weisen über ihre gesamte Länge eine etwa konstante, vom bewegten Gut aus gesehen konvexe Krümmung auf. Sie sind gegenüber der Nabenachse um einen Winkel von ca. 45° in Drehrichtung des Mischwerkzeuges 4 gekippt angebracht (Fig. 3), so daß die Mischflügel 6 das Mischgut zum Aufsteigen zwingen und es zu einer gleichmäßigen Deckelberührung führen. Auch die als ebene Bleche ausgebildeten Abschnitte 7a der Mischflügel 7 sind analog den Mischflügeln 6 gekippt an der Nabe 5 angeordnet (Fig. 4). Die mit den Abschnitten 7a verbundenen vertikal angeordneten Abstreifer 7b erstrecken sich bis in unmittelbare Nähe des Bodens, der Wand und des Deckels des Behälters und bilden in der Draufsicht mit den Abschnitten 7a einen Winkel von ca. 45°.The
It is double-walled, provided with coolant connections and accommodates the centrally arranged mixing tool 4, which rotates around a vertical axis of rotation. With the hub 5 of the mixing tool 4, the
Für einen gleichmäßigen Kontakt des Mischgutes mit den gekühlten Flächen ist es bei einem Mischervolumen von etwa 1150 l vorteilhaft, ein Verhältnis des Behälterdurchmessers zu dessen Höhe von ca. 7 : 1 einzuhalten.For a uniform contact of the mixed material with the cooled surfaces, it is advantageous with a mixer volume of approximately 1150 l to maintain a ratio of the container diameter to its height of approximately 7: 1.
Zur Kühlung des Mischgutes wird der Kühlmischer über die in der Mitte des Deckels 3 befindliche Beschickungsöffnung mit Mischgut zu 50 bis 90% des nutzbaren Volumens der Mischkammer gefüllt.
Das Gehäuse 1 und der Deckel 3 sind, von Kühlwasser durchflossen. Zur Umwälzung des Mischgutes wird das Mischwerkzeug 4 mit einer Umfangsgeschwindigkeit von ca. 1 m/sec. betrieben. Bei dieser gegenüber bekannten Umfangsgeschwindigkeiten niedrigen Umfangsgeschwindigkeit erfolgt die Umwälzung des Mischgutes infolge der entsprechenden Mischflügelgestaltung von innen nach außen und umgekehrt und in vertikaler Richtung. Nach Abschluß des Kühlprozesses wird das Mischgut an der im Behälterboden im Bereich der Abstreifer 7b befindlichen Entleerungsöffnung 8 dem Mischer entnommen.To cool the material to be mixed, the cooling mixer is filled with material to be mixed to 50 to 90% of the usable volume of the mixing chamber via the loading opening located in the middle of the cover 3.
The
Unterschreitet der Füllungsgrad 50 % des nutzbaren Volumens der Mischkammer, ist es für eine gute Durchmischung des Mischgutes zweckmäßig, eine größere Anzahl Mischflügelpaare vorzusehen.If the degree of filling falls below 50% of the usable volume of the mixing chamber, it is advisable for a good mixing of the material to be mixed to provide a larger number of pairs of mixing blades.
Claims (4)
- Cooling mixer for pulverulent or granular plastics and other free-flowing material, consisting of a cylindrical, double-walled container (1), which comprises at least one discharge opening (8), of a rotating mixing tool (4), which is arranged centrally in the container, is formed from a hub (5) and mixing blades (6, 7) rigidly attached to the hub and the vertical axis of rotation of which coincides with the container axis, of a cooling circuit which is connected to the container by coolant connections and the coolant of which flows through the double-walled areas of the container when the cooling mixer is operating, and of a lid (3), which closes the container during operation and comprises at least one feed opening, characterised in that, related to its diameter, the cylindrical container is of a small height, the mixing blades (6, 7) of the mixing tool (4) form an obtuse angle with the areas of the container bottom disposed before the mixing blades (6, 7) in the direction of rotation of the mixing tool (4) in order to vertically deflect the material to be cooled, and the lid (3) is of double-walled construction, is provided with coolant connections and has a coolant flowing through it when the cooling mixer is operating.
- Cooling mixer according to claim 1, characterised in that, related to a plan view of the mixer with the lid (3) open, one or more mixing blade(s) (7) change(s) at least in its/their outer areas from an approximately radial path to one which diverges considerably from the radial direction in the direction of rotation of the mixing tool (4) and, viewed in the same manner, one or more further mixing blade(s) (6) diverge(s) considerably from a radial path opposite to the direction of rotation of the mixing tool (4), with the path of adjacent mixing blades (6, 7) in each case diverging differently from the radial direction.
- Cooling mixer according to claim 2, characterised in that the mixing blades (7) diverging from a radial path in the direction of rotation of the mixing tool (4) are formed at their outer ends as scrapers (7b), which extend into the immediate vicinity of the container wall and of the outer area of the lid (3), for the material to be cooled.
- Method for operating a cooling mixer according to claims 1, 2 or 3, characterised in that the mixing tool (4) rotates at a low circumferential speed which produces a negligibly low centrifugal force in the material to be cooled.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4119033A DE4119033C2 (en) | 1991-06-10 | 1991-06-10 | Cooling mixer for powder or granular plastics |
| DE4119033 | 1991-06-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0526701A1 EP0526701A1 (en) | 1993-02-10 |
| EP0526701B1 true EP0526701B1 (en) | 1994-12-28 |
Family
ID=6433599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92108572A Expired - Lifetime EP0526701B1 (en) | 1991-06-10 | 1992-05-21 | Cooling mixer for powdery or granular plastic material and method for its operation |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0526701B1 (en) |
| JP (1) | JP2504664B2 (en) |
| DE (2) | DE4119033C2 (en) |
| ES (1) | ES2066516T3 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811331B (en) * | 2010-02-22 | 2011-11-30 | 湖南振辉管业有限公司 | Full-automatic plastic mixer |
| DE102012208717A1 (en) | 2012-05-24 | 2013-11-28 | Coperion Gmbh | Weighing/mixing-handling device for e.g. throughmixing of plastic granulates and additives into polymer mixture, has weighing device weighing bulk materials, and gas supply nozzles introducing mixed gas into interior for mixing materials |
| CN112720899B (en) * | 2020-12-31 | 2022-04-19 | 浙江绿净环保科技股份有限公司 | High-efficient compounding equipment of polytetrafluoroethylene powder |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB161741A (en) * | 1920-01-31 | 1921-04-21 | Thomas Lea | Improvements in combined apparatus for measuring, mixing and delivering aggregates for conrete and the like |
| US1533409A (en) * | 1923-10-22 | 1925-04-14 | Racine Confectioners Machinery | Material working and mixing machine |
| US2367149A (en) * | 1940-08-27 | 1945-01-09 | Gulf Oil Corp | Grease manufacturing apparatus |
| FR2052018A5 (en) * | 1969-07-04 | 1971-04-09 | Moritz Jean | |
| DE1956241C3 (en) * | 1969-11-08 | 1975-10-16 | Rheinstahl Ag, 4300 Essen | Cooling mixer for processing plastics |
| DE2047244C3 (en) * | 1970-09-25 | 1988-10-20 | Gebrüder Netzsch, Maschinenfabrik GmbH & Co, 8672 Selb | Agitator mill for continuous fine grinding and dispersing of flowable material |
| US3980282A (en) * | 1974-03-18 | 1976-09-14 | Pettibone Corporation | Material mixing apparatus |
| DE2911774C2 (en) * | 1979-03-26 | 1983-03-31 | Friedrich Horst 5840 Schwerte Papenmeier | Device for processing loose material, in particular PVC powder |
| DE3301207A1 (en) * | 1983-01-15 | 1984-07-19 | Friedrich Walter Dr. 5982 Neuenrade Herfeld | MIXING DEVICE |
-
1991
- 1991-06-10 DE DE4119033A patent/DE4119033C2/en not_active Expired - Fee Related
-
1992
- 1992-05-21 EP EP92108572A patent/EP0526701B1/en not_active Expired - Lifetime
- 1992-05-21 ES ES92108572T patent/ES2066516T3/en not_active Expired - Lifetime
- 1992-05-21 DE DE59201081T patent/DE59201081D1/en not_active Expired - Fee Related
- 1992-06-09 JP JP4149665A patent/JP2504664B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| ES2066516T3 (en) | 1995-03-01 |
| DE4119033A1 (en) | 1992-12-24 |
| DE4119033C2 (en) | 1994-04-21 |
| JPH06155454A (en) | 1994-06-03 |
| DE59201081D1 (en) | 1995-02-09 |
| EP0526701A1 (en) | 1993-02-10 |
| JP2504664B2 (en) | 1996-06-05 |
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