CH694015A5 - Solvent-free coating material, eg for metals, is produced by mixing the components in a melt mixing kneader and then transferring the mixture to a powder - Google Patents
Solvent-free coating material, eg for metals, is produced by mixing the components in a melt mixing kneader and then transferring the mixture to a powder Download PDFInfo
- Publication number
- CH694015A5 CH694015A5 CH00963/99A CH96399A CH694015A5 CH 694015 A5 CH694015 A5 CH 694015A5 CH 00963/99 A CH00963/99 A CH 00963/99A CH 96399 A CH96399 A CH 96399A CH 694015 A5 CH694015 A5 CH 694015A5
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- Prior art keywords
- components
- melt mixer
- kneader
- mixer kneader
- resin
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Classifications
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- 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
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/58—Component parts, details or accessories; Auxiliary operations
- B29B7/60—Component parts, details or accessories; Auxiliary operations for feeding, e.g. end guides for the incoming material
- B29B7/603—Component parts, details or accessories; Auxiliary operations for feeding, e.g. end guides for the incoming material in measured doses, e.g. proportioning of several materials
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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
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/48—Mixing liquids with liquids; Emulsifying characterised by the nature of the liquids
- B01F23/482—Mixing liquids with liquids; Emulsifying characterised by the nature of the liquids using molten solids
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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
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
- B01F27/72—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices
- B01F27/724—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with helices or sections of helices with a single helix closely surrounded by a casing
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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
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/714—Feed mechanisms for feeding predetermined amounts
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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
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/715—Feeding the components in several steps, e.g. successive steps
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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
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/71705—Feed mechanisms characterised by the means for feeding the components to the mixer using belts
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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
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/7173—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper
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- 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
- B29B7/00—Mixing; Kneading
- B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
- B29B7/7476—Systems, i.e. flow charts or diagrams; Plants
- B29B7/748—Plants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/285—Feeding the extrusion material to the extruder
- B29C48/29—Feeding the extrusion material to the extruder in liquid form
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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
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/285—Feeding the extrusion material to the extruder
- B29C48/288—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/285—Feeding the extrusion material to the extruder
- B29C48/288—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules
- B29C48/2886—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules of fibrous, filamentary or filling materials, e.g. thin fibrous reinforcements or fillers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/285—Feeding the extrusion material to the extruder
- B29C48/297—Feeding the extrusion material to the extruder at several locations, e.g. using several hoppers or using a separate additive feeding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/16—Fillers
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
A process for producing a solvent-free coating material for powder coatings comprises mixing the components in a melt mixing kneader (7) and then transferring the mixture to a powder. The components are fed to the kneader without pre-mixing, while individual components are pre- mixed. The components are gravimetrically dosed. At least one thermally hardenable resin and a hardener are placed in the kneading unit. The hardener is supplied downstream of the resin. Filler material is also supplied to the mixer, along with individual components in viscous or liquid form. The arrangement used comprises storage vessels (1a-5a), dosing units (1b-5b), filling openings (8,9,10), and a shaft (13).
Description
Die Erfindung betrifft ein Verfahren zur Herstellung eines lösungsmittelfreien Beschichtungsmaterials für Pulverbeschichtungen nach dem Oberbegriff des Anspruchs 1.
Unter Pulverbeschichtung versteht man die Beschichtung von Metall-, Kunststoff oder Holzoberflächen und dgl. durch Auftragen von thermoplastischen oder wärmehärtbaren Kunststoffpulvern und Einbrennen bzw. Aushärten der Letzteren.
Beschichtungsmaterialien aus Kunststoffen zum Beschichten von Substraten, insbesondere Metallsubstraten, wurden bisher so hergestellt, dass man die einzelnen Bestandteile chargenweise verwog, vormischte und das Vorgemisch anschliessend zum Fertigmischen in einen Schmelzmischkneter einbrachte. Nach dem Austritt aus dem Schmelzmischkneter wurde das Material gekühlt und anschliessend pulverisiert.
Die in Frage stehenden Beschichtungsmaterialien weisen im Allgemeinen folgende Komponenten auf: - ein oder mehrere Harze als Bindemittel, insbesondere Epoxidharze, Acrylharze, Polyester und Poly-urethane, in einer Menge von 25 bis 99 Gew.-%. - Füllstoffe auf mineralischer Basis in einer Menge von 0 bis 65 Gew.-%, wobei sich bei Abwesenheit von Füllstoffen ein Klarlack ergibt. - Farbpigmente und/oder Farbstoffe in einer Menge von 0 bis 50 Gew.-%. - Additive, wie Verlaufmittel, Entgasungsmittel und Antioxydantien in einer Menge von 0 bis 5 Gew.-%. - Bei wärmehärtbaren Harzen ein Härter als Vernetzungsmittel in einer Menge von bis zu 30 Gew.-%.
Das eingangs erwähnte Vorgehen weist eine Reihe von Nachteilen auf:
- Die Art der Vormischung bedingt einen grossen Aufwand für die Reinigung der Vormischungsapparatur. - Die Vormischung lässt sich nicht voll automatisieren und bindet dadurch Arbeitskräfte. - Das Arbeiten mittels Vormischungen setzt beim Vorliegen eines Härters bezüglich der Reaktivität des Vorgemisches wesentliche Grenzen, die den Schmelzmischprozess einengen. - Die Vormischungen neigen zur Entmischung durch Segregation oder Separation. - Die Füllstoffe führen zu einer Abrasion der Vormischungseinrichtung und des Schmelzmischkneters.
Aufgabe der Erfindung ist die Beseitigung zumindest einzelner dieser Nachteile. Diese Aufgabe wird durch das im Kennzeichen des Anspruchs 1 Angeführte gelöst.
Bevorzugte Verfahrensformen sind in den abhängigen Ansprüchen 2 bis 9 umschrieben.
Nachfolgend werden bevorzugte Verfahrensvarianten anhand von Zeichnungen näher erläutert. Dabei zeigt: Fig. 1 eine schematische Darstellung eines Schmelz-mischkneters zur Durchführung des erfindungsgemässen Verfahrens zusammen mit mehreren Vorrats- und Dosiereinrichtungen; Fig. 2 eine schematische Darstellung einer ersten alternativen Ausführungsform eines Schmelzmischkneters; Fig. 3 eine schematische Darstellung einer zweiten alternativen Ausführungsform eines Schmelzmischkneters; Fig. 4 eine schematische Darstellung einer dritten alternativen Ausführungsform eines Schmelzmischkneters und Fig. 5 eine schematische Darstellung einer vierten alternativen Ausführungsform eines Schmelzmischkneters.
Aus der Fig. 1 ist ein Schmelzmischkneter zusammen mit mehreren Komponenten-Vorratsbehältern in schematischer Darstellung ersichtlich. Da die grundsätzliche Gestaltung und Wirkungsweise von Schmelzmischknetern bekannt ist, braucht an dieser Stelle nicht näher darauf eingegangen zu werden. Als bevorzugte Ausführungsformen von Schmelzmischknetern können ein Schneckenextruder oder der Buss KOKNETER< <TM> > angeführt werden.
Mit den Bezugszeichen 1 bis 5 sind fünf Vorrats- und Dosiereinrichtungen bezeichnet, welche je einen Vorratsbehälter 1a bis 5a sowie je eine Dosiervorrichtung 1b bis 5b aufweisen, welche Letztere vorzugsweise nach dem gravimetrischen Prinzip arbeiten. In jedem Vorratsbehälter 1a bis 5a ist eine dem Schmelzmischkneter 7 zuzuführende Komponente A bis E aufgenommen. Im Behälter 1a ist ein Harz oder ein Harzgemisch A, im Behälter 2a Farbpigmente B, im Behälter 3a Additive C, im Behälter 4a Füllstoffe D und im Behälter 5a ein Vernetzungsmittel E aufgenommen. Der Schmelzmischkneter ist mit insgesamt drei Einfüllöffnungen 8, 9, 10 versehen, welche entlang der im Schmelzmischknetergehäuse 12 aufgenommenen Schneckenwelle 13 angeordnet sind.
Der Auslass des Schmelzmischkneters ist mit dem Bezugszeichen 15 bezeichnet. Über die erste Einfüllöffnung 8 werden die Komponenten A, B und C eingebracht, währenddem über die stromabwärts gesehen zweite Einfüllöffnung 9 die Komponente D und über die stromabwärts gesehen dritte Einfüllöffnung 10 die Komponente E eingebracht wird.
Mit der vorliegenden Anordnung können die Komponenten A bis E kontinuierlich aus dem jeweiligen Vorratsbehälter 1a bis 5a entnommen und direkt in den Schmelzmischkneter 7 eingebracht werden.
Beispielsweise hat das Einbringen der Füllstoffe in die zweite Einfüllöffnung den Vorteil, dass die im Allgemeinen sehr abrasiv wirkenden Füllstoffe dem Harz erst zugeführt werden, nachdem dieses bereits erwärmt bzw. geschmolzen und dessen Viskosität daher erniedrigt wurde. Durch die niedrige Viskosität des Harzes werden die zugegebenen Füllstoffe sofort in das Harz eingebunden, wodurch der mechanische Verschleiss des Schmelzmischkneters massgeblich reduziert werden kann. Schliesslich kann durch das späte Zuführen des Vernetzungsmittels E dessen Verweilzeit im Schmelzmischkneter herabgesetzt werden, wodurch die Gefahr gebannt wird, dass eine ungewollte Vernetzung des Harzes bereits im Kneter stattfindet.
Anhand der Fig. 2 bis 4 werden alternative Ausführungsformen von Schmelzmischknetern erläutert, mit welchen unterschiedliche Verfahrensvarianten durchgeführt werden können. Währenddem der Schmelzmischkneter gemäss Fig. 2 nur mit einer Einfüllöffnung versehen ist, über welche sämtliche Komponenten direkt und kontinuierlich zugeführt werden, ist der Schmelzmischkneter gemäss Fig. 3 mit zwei Einfüllöffnungen versehen. In diesem Fall wird über die stromabwärts gesehen zweite Einfüllöffnung vorzugsweise das Vernetzungsmittel zudosiert, wodurch, wie bereits vorgängig erläutert, die Gefahr gebannt wird, dass eine ungewollte Vernetzung des Harzes bereits im Schmelzmischkneter stattfindet.
Fig. 4 zeigt einen mit fünf Einfüllöffnungen versehenen Schmelzmischkneter, bei dem jede einzelne Komponente an einem separaten Ort in den Schmelzmischkneter eingebracht werden kann. Vorzugsweise werde die Komponenten in folgender Reihenfolge eingebracht: Harz, Füllstoffe, Farbpigmente, Additive, Vernetzungsmittel.
Schliesslich zeigt Fig. 5 eine weitere Variante eines Schmelzmischkneters, bei welchem eine Komponente in flüssiger Form zugeführt wird. Dazu weist der Schmelzmischkneter nebst beispielsweise zwei Einfüllöffnungen 8a, 8b für Feststoffe eine Einspritzöffnung 20 für die flüssige Komponente auf. Die flüssige Komponente ist in einem Vorratsbehälter 17 aufgenommen, der über eine Leitung 19a mit einer Förderpumpe verbunden ist. Von der Förderpumpe 18 führt eine Leitung 19b zur Einspritzöffnung 20 für die flüssige Komponente.
Es bleibt anzufügen, dass eine Komponente nicht aus einem einzigen Material - Stoff, Flüssigkeit - bestehen muss, sondern dass unter dem Begriff Komponente durchaus ein Gemisch aus mehreren Stoffen bzw. Flüssigkeiten verstanden werden kann, welche an einer separaten Stelle vorvermischt wurden und in dieser vorvermischten Form in den jeweiligen Vorratsbehälter eingebracht werden. Eine weitere Variante kann darin bestehen, dass eine erste Teilmenge des Harzes an einer ersten Stelle und eine zweite Teilmenge des Harzes an einer zweiten Stelle in den Schmelzmischkneter eingebracht wird.
The invention relates to a method for producing a solvent-free coating material for powder coatings according to the preamble of claim 1.
Powder coating means the coating of metal, plastic or wooden surfaces and the like. By applying thermoplastic or thermosetting plastic powders and baking or curing the latter.
Coating materials made of plastics for coating substrates, in particular metal substrates, have hitherto been produced in such a way that the individual constituents are weighed in batches, premixed, and the premix is then introduced into a melt mixer kneader for the finished mixing. After emerging from the melt mixer kneader, the material was cooled and then pulverized.
The coating materials in question generally have the following components: one or more resins as binders, in particular epoxy resins, acrylic resins, polyesters and polyurethane, in an amount of 25 to 99% by weight. - Mineral-based fillers in an amount of 0 to 65% by weight, a clear coat being obtained in the absence of fillers. - Color pigments and / or dyes in an amount of 0 to 50 wt .-%. - Additives such as leveling agents, degassing agents and antioxidants in an amount of 0 to 5 wt .-%. - In the case of thermosetting resins, a hardener as a crosslinking agent in an amount of up to 30% by weight.
The procedure mentioned at the outset has a number of disadvantages:
- The type of premix requires a great deal of effort for cleaning the premixing apparatus. - The premix cannot be fully automated and therefore ties up workers. - Working with premixes, when a hardener is present, places substantial limits on the reactivity of the premix, which narrow the melt mixing process. - The premixes tend to separate by segregation or separation. - The fillers lead to abrasion of the premixing device and the melt mixer kneader.
The object of the invention is to eliminate at least some of these disadvantages. This object is achieved by what is stated in the characterizing part of claim 1.
Preferred forms of process are described in the dependent claims 2 to 9.
Preferred process variants are explained in more detail below with the aid of drawings. 1 shows a schematic illustration of a melt mixer kneader for carrying out the method according to the invention together with a plurality of storage and metering devices; 2 shows a schematic illustration of a first alternative embodiment of a melt mixer kneader; 3 shows a schematic illustration of a second alternative embodiment of a melt mixer kneader; 4 shows a schematic illustration of a third alternative embodiment of a melt mixer kneader and FIG. 5 shows a schematic illustration of a fourth alternative embodiment of a melt mixer kneader.
1 shows a melt mixer kneader together with several component storage containers in a schematic representation. Since the basic design and mode of operation of melt mixer kneaders is known, there is no need to go into this here. A screw extruder or the Buss KOKNETER <<TM>> can be mentioned as preferred embodiments of melt mixer kneaders.
The reference numerals 1 to 5 designate five storage and metering devices, each having a storage container 1a to 5a and a metering device 1b to 5b, the latter preferably working according to the gravimetric principle. A component A to E to be fed to the melt mixer kneader 7 is accommodated in each storage container 1a to 5a. A resin or a resin mixture A is contained in the container 1a, color pigments B in the container 2a, additives C in the container 3a, fillers D in the container 4a and a crosslinking agent E in the container 5a. The melt mixer kneader is provided with a total of three filling openings 8, 9, 10, which are arranged along the screw shaft 13 accommodated in the melt mixer kneader housing 12.
The outlet of the melt mixer kneader is designated by reference number 15. Components A, B and C are introduced via the first filling opening 8, while component D is introduced via the second filling opening 9 seen downstream and component E is seen via the third filling opening 10 seen downstream.
With the present arrangement, components A to E can be continuously removed from the respective storage containers 1a to 5a and introduced directly into the melt mixer kneader 7.
For example, introducing the fillers into the second fill opening has the advantage that the fillers, which generally have a very abrasive action, are only supplied to the resin after it has already been heated or melted and its viscosity has therefore been reduced. Due to the low viscosity of the resin, the added fillers are immediately incorporated into the resin, which means that the mechanical wear of the melt mixer kneader can be significantly reduced. Finally, the late addition of the crosslinking agent E can reduce its dwell time in the melt mixer kneader, thereby eliminating the risk that unwanted crosslinking of the resin already takes place in the kneader.
2 to 4, alternative embodiments of melt mixer kneaders are explained, with which different process variants can be carried out. While the melt mixer kneader according to FIG. 2 is only provided with one filling opening, through which all components are fed directly and continuously, the melt mixing kneader according to FIG. 3 is provided with two filling openings. In this case, the crosslinking agent is preferably metered in via the downstream second filling opening, which, as already explained above, eliminates the risk that undesired crosslinking of the resin already takes place in the melt mixer kneader.
4 shows a melt mixer kneader provided with five filling openings, in which each individual component can be introduced into the melt mixer kneader at a separate location. The components are preferably introduced in the following sequence: resin, fillers, color pigments, additives, crosslinking agents.
Finally, FIG. 5 shows a further variant of a melt mixer kneader in which a component is supplied in liquid form. For this purpose, the melt mixer kneader has, for example, two filling openings 8a, 8b for solids and an injection opening 20 for the liquid component. The liquid component is received in a storage container 17 which is connected to a feed pump via a line 19a. A line 19b leads from the feed pump 18 to the injection opening 20 for the liquid component.
It remains to be added that a component does not have to consist of a single material - substance, liquid - but that the term component can definitely be understood to mean a mixture of several substances or liquids which were premixed at a separate point and premixed therein Form are introduced into the respective storage container. A further variant can consist in that a first partial amount of the resin is introduced into the melt mixer kneader at a first point and a second partial amount of the resin at a second point.
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CH00963/99A CH694015A5 (en) | 1999-05-25 | 1999-05-25 | Solvent-free coating material, eg for metals, is produced by mixing the components in a melt mixing kneader and then transferring the mixture to a powder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH00963/99A CH694015A5 (en) | 1999-05-25 | 1999-05-25 | Solvent-free coating material, eg for metals, is produced by mixing the components in a melt mixing kneader and then transferring the mixture to a powder |
Publications (1)
Publication Number | Publication Date |
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CH694015A5 true CH694015A5 (en) | 2004-06-15 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CH00963/99A CH694015A5 (en) | 1999-05-25 | 1999-05-25 | Solvent-free coating material, eg for metals, is produced by mixing the components in a melt mixing kneader and then transferring the mixture to a powder |
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CH (1) | CH694015A5 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006058447A1 (en) * | 2004-12-01 | 2006-06-08 | Huerlimann Hans P | Device and method for mixing substances, mixing reactor and method for continuously ejecting a treated substance using said mixing reactor |
CN103432922A (en) * | 2013-09-02 | 2013-12-11 | 武汉合缘绿色生物工程有限公司 | Continuous burdening mixing machine |
WO2014198946A1 (en) * | 2013-06-14 | 2014-12-18 | Marchante Carolina | Extruder for treatment unit for plastics materials, and treatment unit comprising such an extruder |
CN112917871A (en) * | 2019-12-06 | 2021-06-08 | 科倍隆有限公司 | Method and device for producing powder coating melts |
EP4005663A1 (en) * | 2020-11-26 | 2022-06-01 | Fette Compacting GmbH | Powder blender for a system for continuous processing of powder products |
-
1999
- 1999-05-25 CH CH00963/99A patent/CH694015A5/en not_active IP Right Cessation
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006058447A1 (en) * | 2004-12-01 | 2006-06-08 | Huerlimann Hans P | Device and method for mixing substances, mixing reactor and method for continuously ejecting a treated substance using said mixing reactor |
US8118474B2 (en) | 2004-12-01 | 2012-02-21 | Hurlimann Hans P | Device and method for mixing substances, mixing reactor and method for continuously ejecting a treated substance using said mixing reactor |
WO2014198946A1 (en) * | 2013-06-14 | 2014-12-18 | Marchante Carolina | Extruder for treatment unit for plastics materials, and treatment unit comprising such an extruder |
FR3006935A1 (en) * | 2013-06-14 | 2014-12-19 | Carolina Marchante | EXTRUDER FOR A TREATMENT UNIT FOR PLASTIC MATERIALS, AND TREATMENT UNIT COMPRISING SUCH EXTRUDER |
CN103432922A (en) * | 2013-09-02 | 2013-12-11 | 武汉合缘绿色生物工程有限公司 | Continuous burdening mixing machine |
CN112917871A (en) * | 2019-12-06 | 2021-06-08 | 科倍隆有限公司 | Method and device for producing powder coating melts |
EP3831571A1 (en) * | 2019-12-06 | 2021-06-09 | Coperion GmbH | Method and device for producing a powder coating melt |
EP4005663A1 (en) * | 2020-11-26 | 2022-06-01 | Fette Compacting GmbH | Powder blender for a system for continuous processing of powder products |
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