EP1588757B1 - Static mixer for production of curable mixtures from liquid components, and its use - Google Patents

Static mixer for production of curable mixtures from liquid components, and its use Download PDF

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Publication number
EP1588757B1
EP1588757B1 EP05405261A EP05405261A EP1588757B1 EP 1588757 B1 EP1588757 B1 EP 1588757B1 EP 05405261 A EP05405261 A EP 05405261A EP 05405261 A EP05405261 A EP 05405261A EP 1588757 B1 EP1588757 B1 EP 1588757B1
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EP
European Patent Office
Prior art keywords
mixing
static mixer
angle
accordance
filling
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EP05405261A
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German (de)
French (fr)
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EP1588757A1 (en
Inventor
Rolf Heusser
Sandro Martino
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Sulzer Chemtech AG
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Sulzer Chemtech AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/432—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa
    • B01F25/4321—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa the subflows consisting of at least two flat layers which are recombined, e.g. using means having restriction or expansion zones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/47—Mixing liquids with liquids; Emulsifying involving high-viscosity liquids, e.g. asphalt

Definitions

  • the invention relates to a static mixer for a curing mix according to the preamble of claim 1 and a use of the mixer.
  • Static mixers are described for mixing at least two flowable components. These mixers, which are compact, provide good mixing results despite a simple, material-saving construction of their mixer structure, namely when mixing high-viscosity materials such as sealants, two-component foams or two-component adhesives.
  • the internals forming the mixer structure can be inexpensively manufactured by injection molding from thermoplastics, so that they are economically usable for a single use. Such a "disposable mixer” is mainly used for curing products, as these products are virtually impossible to clean the mixers.
  • the object of the invention is to provide an improved with respect to said disposable mixers mixer, for which results in a longer life. This object is achieved by the mixer defined in claim 1.
  • the static mixer is used for a curing mix of flowable components that react to a solidifying mass when mixed.
  • the mixer comprises an installation body produced by injection molding and a tube enclosing the installation body.
  • the mounting body has a chambering through a plurality of mixing chambers.
  • the mixing chambers are arranged behind and alongside one another along a tube axis. By oriented in the direction of the tube axis, radial longitudinal walls and transverse transverse to the tube axis transverse walls they are delimited from each other. Breakthroughs between adjacent chambers in the radial longitudinal walls provide inputs and outputs for the mix.
  • Two parallel outer longitudinal walls form in a frequently used embodiment outside of the mixing chambers.
  • the transverse wall and one of the outer longitudinal walls each enclose an angle filled with wall material, the filling of which, namely the first angular filling, spans a concave surface to the interior of the mixing chamber.
  • the "concave surface” means a surface that is not curved at any point against the interior of the mixing chamber.
  • the surface may also be planar:
  • the concave surface is concavely curved or, together with the angular edges in cross-section, forms a "concave line" which approximates the course of a concavely curved curve.
  • a small wedge-shaped angular fill gives an example of a concave surface in the sense of the second meaning.
  • a static mixer whose installation body is similar to that of the mixer according to the invention, but where the corresponding angular fillings are wedge-shaped and not concave in the sense of the meaning defined above.
  • the shape of these angular fillings is less favorable in terms of extending the service life.
  • the wedge-shaped angular fillings mean relatively large clusters of wall material. Such accumulations of material are Injection molding of the mounting body unfavorable because they have longer production cycles and thus higher production costs result.
  • the mixer structure shown in detail in FIG. 1 of the publication EP-A-0 749 776 known disposable mixer is an injection-molded body 1, which is inserted into a pipe, not shown.
  • This tube enclosing the installation body 1 has an interior with a square cross-section into which the installation body 1 fits in a form-fitting manner.
  • the installation body 1 and the sheathing tube could also be cylindrical: see Fig. 3.
  • From cartridges flowable components of a hardening mix are pressed through the tube and the mounting body 1 by means of pistons, wherein the reactive Mischgutkomponenten mixed to a solidifying mass become.
  • the installation body 1 has a chamber through a plurality of mixing chambers 2.
  • the mixing chambers 2 are arranged along a tube axis 10 behind and next to each other.
  • radial longitudinal walls 3a, 3b, 3c and 3d which are oriented in the direction of the tube axis 10, and transverse transverse to the tube axis 10 transverse walls 4a and 4b, the mixing chambers 2 are delimited from each other. Openings 5a, 5b, 5c and 5d between adjacent chambers 2 establish in the radial longitudinal walls 3a, 3b, 3c and 3d inputs and outputs for the mix.
  • First outer sides 6a of the mixing chambers 2 are formed by two parallel outer longitudinal walls 6. Between these longitudinal walls 6, the mixing chambers 2 each have a second outer side 6b, which is open and is bounded by the pipe, not shown.
  • the outer longitudinal walls 6 can also missing. In the frequently-used embodiment mentioned, the longitudinal walls 6 form the first outer sides 6a.
  • a mixing chamber 2 designed according to the invention is shown in FIG. Arrows also show the transport of the mixed material through the mixing chamber 2 there.
  • On the input side, directly at the transverse wall 4a (see FIG. 1) is the input 5a, through which a stream 12a of the mixed material enters.
  • a current 12b enters.
  • the stream 12a branches into partial streams 12ad and 12ac, which flow out through the exits 5d and 5c into adjacent mixing chambers. Accordingly, the flow 12b is branched into partial flows 12bd and 12bc which, together with the partial flows 12ad and 12ac, leave the mixing chamber 2 shown completely in FIG.
  • a field of pressure gradients is created in the mixing chamber 2.
  • the pressure gradients are most pronounced in the area of the apertures 5a, 5b, 5c and 5d, where the flow rates are greatest.
  • the flow can be thought of as a bundle of streamers.
  • the cross sections of the stream threads widen, and consequently there occur relatively low flow velocities. Accordingly, the pressure gradients are attenuated.
  • the attenuation of the pressure gradients is location-dependent. Especially in corner regions, which are located at a greater distance from the apertures 5a, 5b, 5c and 5d, the pressure gradients are very small.
  • the transverse wall 4b and the outer longitudinal wall 6 enclose an angle filled with wall material, which is indicated as a dash-dotted "tripod" in the transverse wall 4b.
  • the filling of this angle which is referred to as “first angular filling 7" biases a concave surface 7 a (according to the meaning indicated above) to the interior of the mixing chamber 2.
  • first angular filling 7 biases a concave surface 7 a (according to the meaning indicated above) to the interior of the mixing chamber 2.
  • the conditions for the occurrence of stagnation are mitigated with the first angular filling 7, which causes an extension of the service life.
  • a further measure in the form of a "second angle filling 8" additionally contributes to an extension of the service life.
  • the transverse wall 4a and the second outer side 6b enclose an angle filled with wall material, the filling of which, namely the second angular filling 8, also a concave surface 8a spans the interior of the mixing chamber 2.
  • the mode of action of this second angular filling 8 is the same as that of the first angular filling 7.
  • first and / or second angular fillings 7, 8 are formed at least partially different sizes, and each angular filling 7 or 8 is equal to or smaller than the downstream angular fillings 7 and 8 respectively.
  • the angular fillings 7, 8 should not form too large accumulations of material, as already explained above. Therefore, it is advantageous if the following applies to the first angular filling 7 (and the like for the second Angular filling 8):
  • the concave surfaces 7a or 8a are each at least approximately part of a circular cylinder.
  • the axis of this cylinder lies in a plane perpendicular to the tube axis 10 level.
  • the two Winkel Stahl 7 and 8 associated cylinder axes are aligned perpendicular to each other.
  • the concave surfaces 7a and 8a each proceed with a smooth course in flat surface parts 4a 'and 4b' of the transverse walls 4a and 4b. The same applies to transitions in planes on which the outer sides 6a and 6b of the mixing chamber 2 are located.
  • the second outer side 6b of the mixing chamber 2 is covered by the second angular filling in the region of a zone whose area is not greater than the penetration area of the entrance 5a, which adjoins the transverse wall 4a. This condition results from the geometry of the tool, which is used as a mold in the injection molding device.
  • a cylindrical mounting body of the inventive mixer which also has first and second angular fillings 7 and 8 respectively.
  • the outer longitudinal walls 6, which form the first outer sides 6a of the mixing chambers, have a circular segment-shaped cross-section.
  • the second outside 6b is curved. Accordingly, therefore, the one edge of the second angular filling 8 is curved.
  • the mixture of components which react during mixing to a solidifying mass is advantageously mixed continuously or quasi-continuously at a substantially constant or clocked varying pressure, ie pressure drop along the internals 1 of the mixer.
  • the mixing is interrupted and the mixer is replaced as soon as a dispensing of Mixture is noticeably smaller or an increase in the pressing pressure is required.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

A static mixer comprises mixing chambers having a lateral wall (4b) and first outer sides (6a) forming an angle filled with a wall material whose filling (7, 8) spans a concave surface (7a) to the inner space of the mixing chamber.

Description

Die Erfindung betrifft einen statischen Mischer für ein aushärtendes Mischgut gemäss Oberbegriff von Anspruch 1 sowie eine Verwendung des Mischers.The invention relates to a static mixer for a curing mix according to the preamble of claim 1 and a use of the mixer.

In der EP-A- 0 749 776 und der EP-A- 0 815 929 sind statische Mischer zum Mischen von mindestens zwei fliessfähigen Komponenten beschrieben. Diese Mischer, die kompakt sind, liefern trotz einem einfachen, materialsparenden Aufbau ihrer Mischerstruktur gute Mischresultate, und zwar beim Mischen von hochviskosen Stoffen wie beispielsweise Dichtmassen, Zweikomponenten-Schäumen oder Zweikomponenten-Klebstoffen. Die die Mischerstruktur bildenden Einbauten können preisgünstig durch Spritzgiessen aus Thermoplasten hergestellt werden, so dass sie für einen einmaligen Gebrauch wirtschaftlich verwendbar sind. Ein solcher "Einwegmischer" wird hauptsächlich für aushärtende Produkte verwendet, da bei diesen Produkten die Mischer praktisch nicht gereinigt werden können.In the EP-A-0 749 776 and the EP-A-0 815 929 Static mixers are described for mixing at least two flowable components. These mixers, which are compact, provide good mixing results despite a simple, material-saving construction of their mixer structure, namely when mixing high-viscosity materials such as sealants, two-component foams or two-component adhesives. The internals forming the mixer structure can be inexpensively manufactured by injection molding from thermoplastics, so that they are economically usable for a single use. Such a "disposable mixer" is mainly used for curing products, as these products are virtually impossible to clean the mixers.

Auch wenn das Mischen eines aushärtenden Mischguts mit Einwegmischern kontinuierlich oder quasikontinuierlich (beispielsweise getaktet) betrieben wird, ergeben sich doch endliche Standzeiten. Beispielsweise bei einem kontinuierlichen Durchführen des Mischens unter einem weitgehend konstant bleibenden Pressdruck, d.h. Druckabfall längs der Einbauten des Mischers, verringert sich nach der Standzeit die Abgabe von Mischgut merklich. Eine Erhöhung des Pressdrucks erlaubt nur eine relativ kurze Verlängerung der Mischgutabgabe.Even if the mixing of a hardening mixed material with disposable mixers is operated continuously or quasi-continuously (for example clocked), finite service lives result. For example, in a continuous mixing under a substantially constant pressing pressure, i. Pressure drop along the internals of the mixer, markedly reduces the delivery of mix after the service life. An increase in the pressing pressure allows only a relatively short extension of Mischgutabgabe.

Aufgabe der Erfindung ist es, einen bezüglich den genannten Einwegmischern verbesserten Mischer zu schaffen, für den sich eine längere Standzeit ergibt. Diese Aufgabe wird durch den im Anspruch 1 definierten Mischer gelöst.The object of the invention is to provide an improved with respect to said disposable mixers mixer, for which results in a longer life. This object is achieved by the mixer defined in claim 1.

Der statische Mischer wird für ein aushärtendes Mischgut aus fliessfähigen Komponenten verwendet, die beim Mischen zu einer sich verfestigenden Masse reagieren. Der Mischer umfasst einen durch Spritzguss hergestellten Einbaukörper und ein den Einbaukörper ummantelndes Rohr. Der Einbaukörper weist eine Kammerung durch eine Vielzahl von Mischkammern auf. Die Mischkammern sind längs einer Rohrachse hinter- sowie nebeneinander angeordnet. Durch in Richtung der Rohrachse orientierte, radiale Längswände und durch quer zur Rohrachse stehende Querwände sind sie gegen einander abgegrenzt. Durchbrüche zwischen benachbarten Kammern in den radialen Längswänden stellen für das Mischgut Ein- und Ausgänge her. Zwei parallele äussere Längswände bilden bei einer häufig verwendeten Ausführungsform Aussenseiten der Mischkammern. Mindestens für einen Teil der Mischkammern schliessen ausgangsseitig jeweils die Querwand und eine der äusseren Längswände einen mit Wandmaterial gefüllten Winkel ein, dessen Füllung, nämlich die erste Winkelfüllung, eine konkave Oberfläche zum Innenraum der Mischkammer aufspannt.The static mixer is used for a curing mix of flowable components that react to a solidifying mass when mixed. The mixer comprises an installation body produced by injection molding and a tube enclosing the installation body. The mounting body has a chambering through a plurality of mixing chambers. The mixing chambers are arranged behind and alongside one another along a tube axis. By oriented in the direction of the tube axis, radial longitudinal walls and transverse transverse to the tube axis transverse walls they are delimited from each other. Breakthroughs between adjacent chambers in the radial longitudinal walls provide inputs and outputs for the mix. Two parallel outer longitudinal walls form in a frequently used embodiment outside of the mixing chambers. At least for a part of the mixing chambers, on the output side, the transverse wall and one of the outer longitudinal walls each enclose an angle filled with wall material, the filling of which, namely the first angular filling, spans a concave surface to the interior of the mixing chamber.

Die "konkave Oberfläche" bedeutet dabei eine Oberfläche, die an keiner Stelle gegen den Innenraum der Mischkammer hinein gewölbt ist. Die Oberfläche kann auch bereichsweise eben sein: Die konkave Oberfläche ist konkav gekrümmt oder bildet zusammen mit den Winkelflanken im Querschnitt einen "konkaven Streckenzug", der angenähert den Verlauf einer konkav gekrümmten Kurve hat. Eine kleine keilförmige Winkelfüllung gibt ein Beispiel für eine konkave Oberfläche im Sinn der zweiten Bedeutung.The "concave surface" means a surface that is not curved at any point against the interior of the mixing chamber. The surface may also be planar: The concave surface is concavely curved or, together with the angular edges in cross-section, forms a "concave line" which approximates the course of a concavely curved curve. A small wedge-shaped angular fill gives an example of a concave surface in the sense of the second meaning.

Die abhängigen Ansprüche 2 bis 9 betreffen vorteilhafte Ausführungsformen des erfindungsgemässen Mischers. Eine Verwendung des erfindungsgemässen Mischers ist Gegenstand des Anspruchs 10.The dependent claims 2 to 9 relate to advantageous embodiments of the inventive mixer. A use of the mixer according to the invention is the subject matter of claim 10.

Aus der US-A- 2004/0008576 ist ein statischer Mischer bekannt, dessen Einbaukörper jenem des erfindungsgemässen Mischers gleicht, wobei aber die entsprechenden Winkelfüllungen keilförmig und nicht konkav im Sinn der oben definierten Bedeutung sind. Die Form dieser Winkelfüllungen ist hinsichtlich einer Verlängerung der Standzeit weniger günstig. Es besteht auch ein Nachteil darin, dass die keilförmigen Winkelfüllungen relativ grosse Anhäufungen an Wandmaterial bedeuten. Solche Materialanhäufungen sind beim Spritzgiessen des Einbaukörpers ungünstig, da sie längere Produktionszyklen und damit höhere Herstellkosten zur Folge haben.From the US-A-2004/0008576 For example, a static mixer is known whose installation body is similar to that of the mixer according to the invention, but where the corresponding angular fillings are wedge-shaped and not concave in the sense of the meaning defined above. The shape of these angular fillings is less favorable in terms of extending the service life. There is also a disadvantage in that the wedge-shaped angular fillings mean relatively large clusters of wall material. Such accumulations of material are Injection molding of the mounting body unfavorable because they have longer production cycles and thus higher production costs result.

Nachfolgend wird die Erfindung anhand der Zeichnungen erläutert. Es zeigen:

Fig. 1
ausschnittsweise eine Mischerstruktur (Einbaukörper) eines bekannten Einwegmischers,
Fig. 2
eine Mischkammer eines erfindungsgemässen Mischers und
Fig. 3
einen zylindrischen Einbaukörper des erfindungsgemässen Mischers.
The invention will be explained with reference to the drawings. Show it:
Fig. 1
fragmentary a mixer structure (mounting body) of a known disposable mixer,
Fig. 2
a mixing chamber of a mixer according to the invention and
Fig. 3
a cylindrical body of the inventive mixer.

Die in der Fig. 1 ausschnittsweise gezeigte Mischerstruktur des aus der Druckschrift EP-A- 0 749 776 bekannten Einwegmischers ist ein durch Spritzguss hergestellter Einbaukörper 1, der in ein nicht dargestelltes Rohr eingeschoben ist. Dieses den Einbaukörper 1 ummantelnde Rohr hat einen Innenraum mit quadratischem Querschnitt, in den hinein der Einbaukörper 1 formschlüssig passt. (Der Einbaukörper 1 und das ummantelnde Rohr könnten auch zylindrisch ausgebildet sein: vgl. Fig. 3.) Aus Kartuschen werden mittels Kolben fliessfähige Komponenten eines aushärtenden Mischguts durch das Rohr und den Einbaukörper 1 durchgepresst, wobei die reaktiven Mischgutkomponenten zu einer sich verfestigenden Masse vermischt werden. Der Einbaukörper 1 weist eine Kammerung durch eine Vielzahl von Mischkammern 2 auf. Die Mischkammern 2 sind längs einer Rohrachse 10 hinter- sowie nebeneinander angeordnet. Durch radiale Längswände 3a, 3b, 3c und 3d, die in Richtung der Rohrachse 10 orientiert sind, sowie durch quer zur Rohrachse 10 stehende Querwände 4a und 4b sind die Mischkammern 2 gegen einander abgegrenzt. Durchbrüche 5a, 5b, 5c und 5d zwischen benachbarten Kammern 2 stellen in den radialen Längswänden 3a, 3b, 3c und 3d Ein- und Ausgänge für das Mischgut her. Erste Aussenseiten 6a der Mischkammern 2 werden durch zwei parallele äussere Längswände 6 gebildet. Zwischen diesen Längswänden 6 haben die Mischkammern 2 jeweils eine zweite Aussenseite 6b, die offen ist und vom nicht dargestellten Rohr begrenzt wird. Die äusseren Längswände 6 können auch fehlen. Bei der genannten häufig verwendeten Ausführungsform bilden die Längswände 6 die ersten Aussenseiten 6a.The mixer structure shown in detail in FIG. 1 of the publication EP-A-0 749 776 known disposable mixer is an injection-molded body 1, which is inserted into a pipe, not shown. This tube enclosing the installation body 1 has an interior with a square cross-section into which the installation body 1 fits in a form-fitting manner. (The installation body 1 and the sheathing tube could also be cylindrical: see Fig. 3.) From cartridges flowable components of a hardening mix are pressed through the tube and the mounting body 1 by means of pistons, wherein the reactive Mischgutkomponenten mixed to a solidifying mass become. The installation body 1 has a chamber through a plurality of mixing chambers 2. The mixing chambers 2 are arranged along a tube axis 10 behind and next to each other. By radial longitudinal walls 3a, 3b, 3c and 3d, which are oriented in the direction of the tube axis 10, and transverse transverse to the tube axis 10 transverse walls 4a and 4b, the mixing chambers 2 are delimited from each other. Openings 5a, 5b, 5c and 5d between adjacent chambers 2 establish in the radial longitudinal walls 3a, 3b, 3c and 3d inputs and outputs for the mix. First outer sides 6a of the mixing chambers 2 are formed by two parallel outer longitudinal walls 6. Between these longitudinal walls 6, the mixing chambers 2 each have a second outer side 6b, which is open and is bounded by the pipe, not shown. The outer longitudinal walls 6 can also missing. In the frequently-used embodiment mentioned, the longitudinal walls 6 form the first outer sides 6a.

Eine erfindungsgemäss ausgeführte Mischkammer 2 ist in Fig. 2 gezeigt. Mit Pfeilen ist dort auch der Transport des Mischguts durch die Mischkammer 2 dargestellt. Eingangsseitig, unmittelbar bei der Querwand 4a (siehe Fig. 1) befindet sich der Eingang 5a, durch den ein Strom 12a des Mischguts eintritt. Durch den zweiten Eingang 5b tritt ein Strom 12b ein. Der Strom 12a verzweigt sich in Teilströme 12ad und 12ac, die durch die Ausgänge 5d bzw. 5c in benachbarte Mischkammern abströmen. Entsprechend wird der Strom 12b in Teilströme 12bd und 12bc verzweigt, die gemeinsam mit den Teilströmen 12ad und 12ac die in Fig. 2 vollständig dargestellte Mischkammer 2 verlassen.A mixing chamber 2 designed according to the invention is shown in FIG. Arrows also show the transport of the mixed material through the mixing chamber 2 there. On the input side, directly at the transverse wall 4a (see FIG. 1) is the input 5a, through which a stream 12a of the mixed material enters. Through the second input 5b, a current 12b enters. The stream 12a branches into partial streams 12ad and 12ac, which flow out through the exits 5d and 5c into adjacent mixing chambers. Accordingly, the flow 12b is branched into partial flows 12bd and 12bc which, together with the partial flows 12ad and 12ac, leave the mixing chamber 2 shown completely in FIG.

Beim Durchpressen des Mischguts durch die Einbauten 1 entsteht in der Mischkammer 2 ein Feld von Druckgradienten. Entsprechend den Druckgradienten bildet sich ein Geschwindigkeitsfeld der Mischgutströmung aus. Die Druckgradienten sind am ausgeprägtesten im Bereich der Durchbrüche 5a, 5b, 5c und 5d, wo auch die Strömungsgeschwindigkeiten am grössten sind. Die Strömung lässt sich als Bündel von Stromfäden vorstellen. Innerhalb der Mischkammer 2 weiten sich die Querschnitte der Stromfäden, und folglich treten dort relativ geringe Strömungsgeschwindigkeiten auf. Entsprechend sind auch die Druckgradienten abgeschwächt. Die Abschwächung der Druckgradienten ist ortsabhängig. Besonders in Eckbereichen, die in grösserer Entfernung von den Durchbrüchen 5a, 5b, 5c und 5d liegen, sind die Druckgradienten sehr klein. Sie verschwinden dort praktisch, so dass das Mischgut sehr langsam fliesst und praktisch stagniert. In Mischkammern, in denen die Vermischung schon weit fortgeschritten ist, kommt es zur Reaktion zwischen den Mischgutkomponenten. Dies führt in den Bereichen mit stagnierender Strömung zu einer Vergrösserung der Viskosität des Mischguts. Durch diese Änderung der Viskosität vergrössern sich die stagnierten Bereiche, so dass sich unaufhaltsam eine lokale Immobilisierung ergibt. Diese Immobilisierung beginnt in den genannten Eckbereichen und dehnt sich von dort in den Innenbereich der Mischkammer 2 aus. Dadurch erhöht sich der Strömungswiderstand der Einbauten 1. Gleichzeitig wird auch die Mischgüte beeinträchtigt.When the mixed material is pressed through the internals 1, a field of pressure gradients is created in the mixing chamber 2. According to the pressure gradients, a velocity field of the mixed material flow is formed. The pressure gradients are most pronounced in the area of the apertures 5a, 5b, 5c and 5d, where the flow rates are greatest. The flow can be thought of as a bundle of streamers. Within the mixing chamber 2, the cross sections of the stream threads widen, and consequently there occur relatively low flow velocities. Accordingly, the pressure gradients are attenuated. The attenuation of the pressure gradients is location-dependent. Especially in corner regions, which are located at a greater distance from the apertures 5a, 5b, 5c and 5d, the pressure gradients are very small. They practically disappear there, so that the mix flows very slowly and practically stagnates. In mixing chambers, where the mixing is already well advanced, the reaction between the components of the mix material occurs. This leads in the areas with stagnant flow to an increase in the viscosity of the mix. As a result of this change in viscosity, the stagnant regions increase, so that inexorable a local immobilization results. This immobilization begins in said corner areas and expands from there into the interior of the mixing chamber 2. This increases the flow resistance of the internals 1. At the same time, the mixing quality is impaired.

Mit dem Auftreten der Immobilisierung ist verbunden, dass das Mischen mit dem Einwegmischer nur während einer Standzeit, die von der Reaktionskinetik des aushärtenden Mischguts abhängt, durchführbar ist. Die Standzeit kann verlängert werden, wenn Massnahmen gegen die Stagnation im fliessenden Mischgut ergriffen werden. Solche Massnahmen sind erfindungsgemäss vorgesehene Modifikationen der in Fig. 1 dargestellten Mischkammer 2. Es handelt sich dabei um folgende Modifikationen:With the occurrence of immobilization is associated that the mixing with the disposable mixer is feasible only during a service life, which depends on the reaction kinetics of the curing mix. The service life can be extended if measures are taken against the stagnation in the flowing mix. Such measures are inventively provided modifications of the mixing chamber 2 shown in Fig. 1 These are the following modifications:

Ausgangsseitig schliessen die Querwand 4b und die äussere Längswand 6 einen mit Wandmaterial gefüllten Winkel ein, der als strichpunktiert gezeichnetes "Dreibein" bei der Querwand 4b angedeutet ist. Die Füllung dieses Winkels, die als "erste Winkelfüllung 7" bezeichnet wird, spannt eine konkave Oberfläche 7a (gemäss der oben angegebenen Bedeutung) zum Innenraum der Mischkammer 2 auf. Wie anschaulich aus der Fig. 2 klar wird, sind mit der ersten Winkelfüllung 7 die Bedingungen für das Auftreten einer Stagnation entschärft, was eine Verlängerung der Standzeit bewirkt.On the output side, the transverse wall 4b and the outer longitudinal wall 6 enclose an angle filled with wall material, which is indicated as a dash-dotted "tripod" in the transverse wall 4b. The filling of this angle, which is referred to as "first angular filling 7", biases a concave surface 7 a (according to the meaning indicated above) to the interior of the mixing chamber 2. As clearly shown in FIG. 2, the conditions for the occurrence of stagnation are mitigated with the first angular filling 7, which causes an extension of the service life.

Eine weitere Massnahme in Form einer "zweiten Winkelfüllung 8" trägt zusätzlich zu einer Verlängerung der Standzeit bei: In der Mischkammer 2 schliessen eingangseitig die Querwand 4a und die zweite Aussenseite 6b einen mit Wandmaterial gefüllten Winkel ein, dessen Füllung, nämlich die zweite Winkelfüllung 8, ebenfalls eine konkave Oberfläche 8a zum Innenraum der Mischkammer 2 aufspannt. Die Wirkungsweise dieser zweiten Winkelfüllung 8 ist gleich wie jene der ersten Winkelfüllung 7.A further measure in the form of a "second angle filling 8" additionally contributes to an extension of the service life. In the mixing chamber 2, the transverse wall 4a and the second outer side 6b enclose an angle filled with wall material, the filling of which, namely the second angular filling 8, also a concave surface 8a spans the interior of the mixing chamber 2. The mode of action of this second angular filling 8 is the same as that of the first angular filling 7.

Die Immobilisierung tritt umso stärker in Erscheinung, je weiter eine Mischkammern 2 stromabwärts liegt - solange keine oder überall die gleiche Massnahme gegen dieses Problem ergriffen ist. Daher ist es von Vorteil, wenn die ersten und/oder zweiten Winkelfüllungen 7, 8 zumindest teilweise verschieden gross ausgebildet sind, und dabei jede Winkelfüllung 7 oder 8 gleich gross oder kleiner als die stromabwärts folgenden Winkelfüllungen 7 bzw. 8 ist.The immobilization occurs all the more strongly, the further a mixing chambers 2 downstream - as long as no or everywhere the same measure against this problem is taken. Therefore, it is advantageous if the first and / or second angular fillings 7, 8 are formed at least partially different sizes, and each angular filling 7 or 8 is equal to or smaller than the downstream angular fillings 7 and 8 respectively.

Die Winkelfüllungen 7, 8 sollen keine zu grossen Materialanhäufungen bilden, wie bereits oben begründet worden ist. Daher ist es vorteilhaft, wenn folgendes für die erste Winkelfüllung 7 gilt (und Entsprechendes für die zweite Winkelfüllung 8): Die konkaven Oberflächen 7a (bzw. 8a) gehen jeweils an einer Grenzlinie 7b zu einem ebenen Flächenteil 4b' (bzw. 4a') der Querwand 4b (bzw. 4a) über; diese Grenzlinie 7b soll in einem mittleren Streifen der Querwand 4b liegen, wobei dieser Streifen das mittlere Drittel der Querwand 4b auf deren Innenseite belegt.The angular fillings 7, 8 should not form too large accumulations of material, as already explained above. Therefore, it is advantageous if the following applies to the first angular filling 7 (and the like for the second Angular filling 8): The concave surfaces 7a (or 8a) respectively at a boundary line 7b to a flat surface part 4b '(or 4a') of the transverse wall 4b (or 4a) on; this boundary line 7b should lie in a middle strip of the transverse wall 4b, this strip occupying the middle third of the transverse wall 4b on the inside thereof.

Die konkaven Oberflächen 7a oder 8a sind jeweils zumindest angenähert Teil eines Kreiszylinders. Die Achse dieses Zylinders liegt dabei in einer senkrecht zur Rohrachse 10 stehenden Ebene. Die den beiden Winkelfüllungen 7 und 8 zugeordneten Zylinderachsen sind senkrecht zueinander ausgerichtet.The concave surfaces 7a or 8a are each at least approximately part of a circular cylinder. The axis of this cylinder lies in a plane perpendicular to the tube axis 10 level. The two Winkelfüllungen 7 and 8 associated cylinder axes are aligned perpendicular to each other.

Mit Vorteil gehen die konkaven Oberflächen 7a und 8a jeweils mit glattem Verlauf in ebene Flächenteile 4a' bzw. 4b' der Querwände 4a bzw. 4b über. Das Gleiche gilt für Übergänge in Ebenen, auf denen die Aussenseiten 6a bzw. 6b der Mischkammer 2 liegen.Advantageously, the concave surfaces 7a and 8a each proceed with a smooth course in flat surface parts 4a 'and 4b' of the transverse walls 4a and 4b. The same applies to transitions in planes on which the outer sides 6a and 6b of the mixing chamber 2 are located.

Die zweite Aussenseite 6b der Mischkammer 2 ist durch die zweite Winkelfüllung im Bereich einer Zone abgedeckt, deren Fläche nicht grösser als die Durchbruchsfläche des Eingangs 5a ist, der an die Querwand 4a angrenzt. Diese Bedingung ergibt sich durch die Geometrie des Werkzeugs, das als Giessform in der Spritzgusseinrichtung eingesetzt wird.The second outer side 6b of the mixing chamber 2 is covered by the second angular filling in the region of a zone whose area is not greater than the penetration area of the entrance 5a, which adjoins the transverse wall 4a. This condition results from the geometry of the tool, which is used as a mold in the injection molding device.

In Fig. 3 ist ein zylindrischer Einbaukörper des erfindungsgemässen Mischers gezeigt, der auch erste und zweite Winkelfüllungen 7 bzw. 8 aufweist. Die äusseren Längswände 6, welche die ersten Aussenseiten 6a der Mischkammern bilden, haben einen kreissegmentförmigen Querschnitt. Die zweite Aussenseite 6b ist gekrümmt. Entsprechend ist daher auch die eine Flanke der zweiten Winkelfüllung 8 gekrümmt.In Fig. 3, a cylindrical mounting body of the inventive mixer is shown, which also has first and second angular fillings 7 and 8 respectively. The outer longitudinal walls 6, which form the first outer sides 6a of the mixing chambers, have a circular segment-shaped cross-section. The second outside 6b is curved. Accordingly, therefore, the one edge of the second angular filling 8 is curved.

Bei der Verwendung des erfindungsgemässen Mischers wird mit Vorteil das Mischgut aus Komponenten, die beim Mischen zu einer sich verfestigenden Masse reagieren, bei einem weitgehend konstant bleibenden oder getaktet variierenden Pressdruck, d.h. Druckabfall längs der Einbauten 1 des Mischers, kontinuierlich bzw. quasikontinuierlich gemischt. Das Mischen wird unterbrochen sowie der Mischer ausgewechselt, sobald eine Abgabe von Mischgut merklich kleiner wird oder eine Vergrösserung des Pressdrucks erforderlich wird.When using the mixer according to the invention, the mixture of components which react during mixing to a solidifying mass is advantageously mixed continuously or quasi-continuously at a substantially constant or clocked varying pressure, ie pressure drop along the internals 1 of the mixer. The mixing is interrupted and the mixer is replaced as soon as a dispensing of Mixture is noticeably smaller or an increase in the pressing pressure is required.

Claims (10)

  1. A static mixer for a curing mixed product of flowable components which react on mixing to form a solidifying mass, which mixer includes an installed element (1) made by injection moulding and a tube encasing the installed element, wherein the installed element has a plurality of mixing chambers (2), the mixing chambers - arranged behind one another and next to one another along a tube axis (10) - are delineated from one another by radial longitudinal walls (3a, 3b, 3c, 3d) oriented in the direction of the tube axis and by transverse walls (4a, 4b) standing transversely to the tube axis, wherein openings (5a, 5b, 5c, 5c) in the radial longitudinal walls between adjacent chambers establish inlets and outlets for the mixed product and wherein two outer sides, in particular two parallel outer longitudinal walls (6), extending in the direction of the tube axis form first outer sides (6a) of the mixing chambers,
    characterised in that - at least for some of the mixing chambers - one transverse wall (4b) and one of the first outer sides (6a) each form an angle which is partly filled with wall material and whose filling, termed the first angle filling (7) in the following, sets up a concave surface (7a) to the interior space of the mixing chamber which is concavely curved or forms a concave segment in cross-section with the flanks of the angle.
  2. A static mixer in accordance with claim 1, characterised in that the mixing chambers (2) each have a second outer side (6b) between the first outer sides (6a) which is bounded by the tube at open positions; in that, at least for some of the mixing chambers at the inlet side, one transverse wall (4a) and the second outer side respectively include an angle at the inlet side which is partly filled with wall material and whose filling, termed the second angle filling (8) in the following, sets up a concave surface (8a) to the interior space of the mixing chamber which is concavely curved or forms a concave segment in cross-section with the flanks of the angle.
  3. A static mixer in accordance with claim 1 or claim 2, characterised in that the concave surfaces (7a, 8a) each merge into a planar surface part (4b') of the transverse wall (4b) at an interface line (7b) and this interface line lies in a middle strip of the transverse wall, with this strip occupying the middle third of the transverse wall on its inner sides.
  4. A static mixer in accordance with any one of claims 1 to 3, characterised in that the concave surface (7a, 8a) is part of a circular cylinder whose axis lies in a plane standing perpendicular to the tube axis (10).
  5. A static mixer in accordance with claim 1 or claim 2, characterised in that the concave surfaces (7a, 8a) each merge with a smooth course into planar surface parts (4b') of the transverse walls (4b) and/or into planes on which the outer sides (6a, 6b) of the mixing chambers (2) lie.
  6. A static mixer in accordance with any one of claims 1 to 5, characterised in that the second outer side (6b) of the mixing chamber (2) is covered by the second angle filling (8) in the region of a zone whose area is equally as large as the opening area of the inlet (5a) which borders on the transverse wall (4a).
  7. A static mixer in accordance with any one of claims 1 to 6, characterised in that the first and/or second angle fillings (7, 8) are at least partly of different sizes.
  8. A static mixer in accordance with claim 7, characterised in that each angle filling is equally as large as or smaller than the corresponding angle fillings following downstream.
  9. A static mixer in accordance with any one of claims 1 to 8, characterised in that the cross-sections of the tube, and accordingly that of the installed element (1), are rectangular or circular.
  10. Use of the static mixer in accordance with any one of claims 1 to 9 for the mixing of a curing mixed product of flowable components which react to form a solidifying mass on mixing, with mixing taking place at a pressing pressure which remains largely constant or varies in cycles and with the mixing being interrupted and the mixer replaced as soon as an increase in the pressing pressure becomes necessary.
EP05405261A 2004-04-22 2005-03-23 Static mixer for production of curable mixtures from liquid components, and its use Active EP1588757B1 (en)

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DE202011050465U1 (en) 2011-06-16 2011-08-17 Vosschemie Gmbh Static mixer for mixing at least two flowable components
EP3059006A1 (en) 2015-02-12 2016-08-24 Nordson Corporation Double wedge mixing baffle and associated static mixer and methods of mixing
WO2019020764A1 (en) 2017-07-28 2019-01-31 Kettenbach Gmbh & Co. Kg Mixer
DE102017117198A1 (en) 2017-07-28 2019-01-31 3lmed GmbH mixer

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WO2012172078A1 (en) 2011-06-16 2012-12-20 Vosschemie Gmbh Static mixer for mixing at least two flowable components
EP3059006A1 (en) 2015-02-12 2016-08-24 Nordson Corporation Double wedge mixing baffle and associated static mixer and methods of mixing
WO2019020764A1 (en) 2017-07-28 2019-01-31 Kettenbach Gmbh & Co. Kg Mixer
DE102017117198A1 (en) 2017-07-28 2019-01-31 3lmed GmbH mixer

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ES2290872T3 (en) 2008-02-16
CN1695780A (en) 2005-11-16
US20050237856A1 (en) 2005-10-27
TW200600184A (en) 2006-01-01
CA2500637A1 (en) 2005-10-22
CN100478058C (en) 2009-04-15
TWI354577B (en) 2011-12-21
EP1588757A1 (en) 2005-10-26
CA2500637C (en) 2013-06-25
ATE368507T1 (en) 2007-08-15
US7322740B2 (en) 2008-01-29
JP4686246B2 (en) 2011-05-25
JP2005305436A (en) 2005-11-04

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