EP1663465B1 - Mixing shaft for thorough mixing and comminuting of food products - Google Patents

Mixing shaft for thorough mixing and comminuting of food products Download PDF

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Publication number
EP1663465B1
EP1663465B1 EP04762574A EP04762574A EP1663465B1 EP 1663465 B1 EP1663465 B1 EP 1663465B1 EP 04762574 A EP04762574 A EP 04762574A EP 04762574 A EP04762574 A EP 04762574A EP 1663465 B1 EP1663465 B1 EP 1663465B1
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EP
European Patent Office
Prior art keywords
mixing shaft
mixing
steel core
coating
elongated
Prior art date
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Active
Application number
EP04762574A
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German (de)
French (fr)
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EP1663465A2 (en
Inventor
Franz Koop
Gerhard Brockmann
Regina Hermann
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Stephan Machinery GmbH
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Stephan Machinery GmbH
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Priority to PL04762574T priority Critical patent/PL1663465T3/en
Publication of EP1663465A2 publication Critical patent/EP1663465A2/en
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Publication of EP1663465B1 publication Critical patent/EP1663465B1/en
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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
    • B01F27/05—Stirrers
    • B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
    • 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
    • B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
    • B01F27/053—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials
    • 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
    • B01F27/071—Fixing of the stirrer to the shaft
    • 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
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
    • B01F27/053—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials
    • B01F27/0531—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials with particular surface characteristics, e.g. coated or rough
    • 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
    • B01F27/21—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by their rotating shafts
    • B01F27/211—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by their rotating shafts characterised by the material of the shaft

Definitions

  • the present invention is concerned with a mixing shaft for mixing and dividing food products in an aggregate, in particular with a plastic coating on the stainless steel core of the mixing shaft.
  • mixing shafts are known in the art from DE 88 04 492.0 known.
  • the well-known mixing shaft has a smooth, round steel core, on the surface of which a casing is applied, which has flattened areas at various points, which serve for the non-rotatable attachment of mixing elements.
  • the mixing shafts are usually installed in a heating unit of a continuously producing digester, in which water-quality steam is injected through nozzles into the food products, such as processed cheese, soups, sauces.
  • the mixing shafts are rotated at turns of 300 to 3,000 revolutions per minute in the food product. To ensure optimum condensation of the water vapor on the product particles and thus optimum heating ensure the product must be cut by means of the mixing shaft in order to obtain the largest possible surface.
  • the mixing shafts known in the prior art consist of a stainless steel core, over which a plastic coating is applied by various methods and sealed with sealing rings.
  • the structured mixing shaft according to the invention for mixing and dividing food products into an aggregate is characterized in that a steel core with a structured surface is surrounded by a coating, the coating having mixing elements integrated in the coating.
  • the method for producing a coating on the surface of a steel core of a mixing shaft for mixing and dividing food products in an aggregate by means of a known processing method for applying PTFE to surfaces is characterized in that on the structured surface of the steel core at isostatic pressure ( p) and elevated temperatures (T) a coating with mixing elements is applied.
  • the coating is a so-called PTFE (polytetraethylene) or a ceramic material.
  • the steel core is made of stainless steel.
  • the elongated cylinder portion of the mixing shaft has at one end a flange with which the mixing shaft is supported on the other working tools of the unit.
  • the mixing unit has a product chamber, in the chamber wall advantageously at least one injection nozzle is arranged through which a water vapor is injected in drinking water quality.
  • the plastic coating is pressed isostatically at high pressures of 300 to 350 bar, then sintered at temperatures of 360 ° C to 380 ° C and then machined. After the plastic coating has been applied to the steel core of the mixing shaft, it is advantageous to polish the surface of the plastic coating.
  • mixing elements are part of the coating.
  • the cylindrical portion of the mixing shaft has elongated grooves and elevations whose corners and edges are rounded, wherein the widths of the grooves and elevations are approximately equal.
  • the Fig. 1 shows a perspective schematic representation of the unit 2, in which the mixing shaft 1 according to the invention is installed.
  • the mixing shaft will be described below.
  • the mixing shaft 1 has at its one end another working tool 8, on which the entire shaft is supported.
  • the steel core 3 has a fastening screw 16, with which the mixing shaft 1 is pressed against the working tool.
  • In the walls 10 of the product unit 2 at least one injection nozzle 11 is arranged, are injected with the arbitrary means in the interior of the product unit 2.
  • the mixing shaft 1 is driven with revolutions between 300 to 3,000 revolutions per minute.
  • the Fig. 2 shows a perspective view of a partial sectional view of the mixing shaft according to the invention 1.
  • the mixing shaft 1 consists essentially of an elongated cylindrical steel core 3, which is surrounded by a plastic coating 6.
  • the steel core 3 has a bore 17 in the center, in which a bolt 18 is guided with a thread, not shown here, with which the mixing shaft 1 is pressed with a screw 16 against the working tool.
  • Both the surface of the flange and the entire cylindrical portion 7 of the steel core 3, with the exception of the end faces 19, are surrounded by a single plastic coating 6.
  • the surface of the plastic coating 6 itself is structured and has, in the present exemplary embodiment, radially projecting mixing elements 4 whose distances (A) are different and are distributed over the entire surface circumference of the mixing shaft 1 quasi irregular.
  • the coating 6 is in the present embodiment, a so-called PTFE (polytetrafluoroethylene), which is isostatic pressed at a relatively high pressure and sintered at temperatures between 360 ° C and 380 ° C. Because of the different coefficients of expansion of plastic and steel, air gaps are generally formed at the boundary surfaces 20 between the coating and the steel core, in which product residues penetrate and can no longer be removed.
  • the surface of the steel core 3 is executed structured.
  • the structure of elongated grooves 12 and elongated protrusions 13 is formed over a part of the cylindrical portion of the steel core 3.
  • the depth of the grooves is about 2 mm and the widths of the grooves 12 and the elevations are between 6 mm and 10 mm.
  • the grooves 12 terminate shortly before the end face of the cylindrical portion 7 of the mixing shaft 1, whereby an additional slip resistance for the plastic coating 6 is given. Further, for some embodiments, it is advantageous to roughen the entire surface, with the exception of the end faces, of the cylindrical portion of the mixing shaft 1, whereby the plastic coating can penetrate into the pores of the roughening.

Abstract

A mixing shaft (1) is disclosed, used in an assembly (2) of a unit for thorough mixing and comminuting of food products. The mixing shaft (1) comprises a steel core (3), surrounded by a one-piece plastic coating (6) with mixing elements (4). In order to retain the plastic coating (6) on the steel core (3) of the mixing shaft (1), the surface of the steel core (3) has a structured embodiment. The plastic coating (6) is applied to the mixing shaft (1) by means of a particular isostatic pressurized application method.

Description

Die vorliegenden Erfindung befasst sich mit einer Mischwelle zur Durchmischung und Zerteilung von Lebensmittelprodukten in einem Aggregat, insbesondere mit einem Kunststoffüberzug auf dem Edelstahlkern der Mischwelle.The present invention is concerned with a mixing shaft for mixing and dividing food products in an aggregate, in particular with a plastic coating on the stainless steel core of the mixing shaft.

Derartige Mischwellen sind im Stand der Technik aus der DE 88 04 492.0 bekannt. Die bakannte Mischwelle weist einen glatten, runden Stahlkern auf, auf dessen Oberfläche eine Ummantelung aufgebracht ist, die an verschiedenen Stellen Abflachungen aufweist, die zur drehfesten Befestigung von Mischelementen dienen. Die Mischwellen sind meist in einem Erhitzungsaggregat eines kontinuierlich produzierenden Kochers eingebaut, in dem über Düsen Wasserdampf in Trinkwasserqualität in die Lebensmittelprodukte, wie beispielsweise Schmelzkäse, Suppen, Soßen injiziert wird. Dabei werden die Mischwellen mit Umdrehungen von 300 bis 3.000 Umdrehungen pro Minute in dem Lebensmittelprodukt gedreht. Um eine optimale Kondensation des Wasserdampfs an den Produktpartikeln und damit ein optimales Aufheizen zu gewährleisten, muss mittels der Mischwelle das Produkt zerteilt werden, um eine möglichst große Oberfläche zu erhalten.Such mixing shafts are known in the art from DE 88 04 492.0 known. The well-known mixing shaft has a smooth, round steel core, on the surface of which a casing is applied, which has flattened areas at various points, which serve for the non-rotatable attachment of mixing elements. The mixing shafts are usually installed in a heating unit of a continuously producing digester, in which water-quality steam is injected through nozzles into the food products, such as processed cheese, soups, sauces. The mixing shafts are rotated at turns of 300 to 3,000 revolutions per minute in the food product. To ensure optimum condensation of the water vapor on the product particles and thus optimum heating ensure the product must be cut by means of the mixing shaft in order to obtain the largest possible surface.

Die im Stand der Technik bekannten Mischwellen bestehen aus einem Edelstahlkern, über den ein Kunststoffüberzug mit verschiedenen Methoden aufgetragen und mit Dichtringen abgedichtet wird.The mixing shafts known in the prior art consist of a stainless steel core, over which a plastic coating is applied by various methods and sealed with sealing rings.

Als nachteilig an den bisherigen Ausführungsformen der Mischwellen hat es sich erwiesen, dass gewisse Laktose-, Eiweißmoleküle und Proteine auf der Oberfläche des Kunststoffüberzugs anhaften und verbrennen und damit die Standzeit der Mischwelle und Produktqualität stark reduzieren. Ferner weisen die bisher bekannten Mischwellen bzw. deren Kunststoffüberzüge eine ungenügende Stabilität bei erhöhten Temperaturen von ca. 150 °C auf. Weiterhin ist es aus hygienischen Gründen nachteilig, dass sich infolge der unterschiedlichen thermischen Ausdehnungskoeffizienten von Kunststoffen und Metallen während des Betriebes bei erhöhten Temperaturen Zwischenräume zwischen dem Kunststoffüberzug und dem Metall der Mischwelle bilden, in die die Lebensmittelprodukte eindringen und daher schwer zu reinigen und zu entfernen sind.A disadvantage of the previous embodiments of the mixing shafts, it has been found that certain lactose, protein molecules and proteins adhere to the surface of the plastic coating and burn and thus greatly reduce the service life of the mixing shaft and product quality. Furthermore, the previously known mixing shafts or their plastic coatings an insufficient stability at elevated temperatures of about 150 ° C. Furthermore, it is disadvantageous for hygienic reasons that form due to the different thermal expansion coefficients of plastics and metals during operation at elevated temperatures interstices between the plastic coating and the metal of the mixing shaft into which penetrate the food products and are therefore difficult to clean and remove ,

Daher ist es Aufgabe der vorliegenden Erfindung, eine Mischwelle für Lebensmittelprodukte bereitzustellen, die betriebssicher ist und eine lange Standzeit aufweist und in der Anwendung hygienisch ist.Therefore, it is an object of the present invention to provide a mixing shaft for food products, which is reliable and has a long service life and is hygienic in the application.

Diese Aufgabe wird mit den kennzeichnenden Merkmalen der Hauptansprüche gelöst.This object is achieved with the characterizing features of the main claims.

Weitere erfindungswesentliche Merkmale sind den Unteransprüchen zu entnehmen.Other features essential to the invention can be found in the dependent claims.

Die erfindungsgemäße strukturierte Mischwelle zur Durchmischung und Zerteilung von Lebensmittelprodukten in einem Aggregat ist dadurch gekennzeichnet, dass ein Stahlkern mit einer strukturierten Oberfläche von einem Überzug umgeben ist, wobei der Überzug Mischelemente aufweist, die in dem Überzug integriert sind.The structured mixing shaft according to the invention for mixing and dividing food products into an aggregate is characterized in that a steel core with a structured surface is surrounded by a coating, the coating having mixing elements integrated in the coating.

Das Verfahren zur Herstellung eines Überzugs auf der Oberfläche eines Stahlkerns einer Mischwelle zur Durchmischung und Zerteilung von Lebensmittelprodukten in einem Aggregat mit Hilfe eines an sich bekannten Verarbeitungsverfahrens zur Aufbringung von PTFE auf Oberflächen ist dadurch gekennzeichnet, dass auf die strukturierte Oberfläche des Stahlkerns bei isostatischem Druck (p) und erhöhten Temperaturen (T) ein Überzug mit Mischelementen aufgebracht wird.The method for producing a coating on the surface of a steel core of a mixing shaft for mixing and dividing food products in an aggregate by means of a known processing method for applying PTFE to surfaces is characterized in that on the structured surface of the steel core at isostatic pressure ( p) and elevated temperatures (T) a coating with mixing elements is applied.

Vorteilhaft ist es dabei, dass der Überzug ein sogenannter PTFE (Polytetraethylen) oder ein Keramikmaterial ist. Ferner ist es vorteilhaft, dass der Stahlkern aus Edelstahl ist.It is advantageous in this case that the coating is a so-called PTFE (polytetraethylene) or a ceramic material. Furthermore, it is advantageous that the steel core is made of stainless steel.

Vorteilhaft ist es ferner, dass der längliche Zylinderabschnitt der Mischwelle an einem Ende einen Flansch aufweist, mit dem sich die Mischwelle an den weiteren Arbeitswerkzeugen des Aggregats abstützt.It is also advantageous that the elongated cylinder portion of the mixing shaft has at one end a flange with which the mixing shaft is supported on the other working tools of the unit.

Vorteilhaft ist es auch, dass auf dem zylindrischen Abschnitt der Mischwelle Mischelemente, vorzugsweise rund, in bestimmten Abständen (A) angeordnet sind, wobei die Abstände (A) unregelmäßig sind.It is also advantageous that on the cylindrical portion of the mixing shaft mixing elements, preferably round, at certain intervals (A) are arranged, wherein the distances (A) are irregular.

Das Mischaggregat weist eine Produktkammer auf, in dessen Kammerwand vorteilhaft mindestens eine Injektionsdüse angeordnet ist, durch die ein Wasserdampf in Trinkwasserqualität injiziert wird.The mixing unit has a product chamber, in the chamber wall advantageously at least one injection nozzle is arranged through which a water vapor is injected in drinking water quality.

Vorteilhaft ist es ferner, dass der Kunststoffüberzug isostatisch bei hohen Drücken von 300 bis 350 bar aufgepresst, dann bei Temperaturen von 360°C bis 380°C gesintert und anschließend spanend bearbeitet wird. Nachdem der Kunststoffüberzug auf den Stahlkern der Mischwelle aufgebracht wurde, ist es vorteilhaft, die Oberfläche des Kunststoffüberzugs zu polieren.It is also advantageous that the plastic coating is pressed isostatically at high pressures of 300 to 350 bar, then sintered at temperatures of 360 ° C to 380 ° C and then machined. After the plastic coating has been applied to the steel core of the mixing shaft, it is advantageous to polish the surface of the plastic coating.

Vorteilhaft ist es weiterhin, dass die Mischelemente Bestandteil des Überzugs sind.It is also advantageous that the mixing elements are part of the coating.

Vorteilhaft ist es auch, dass der zylindrische Abschnitt der Mischwelle längliche Nuten und Erhebungen aufweist, deren Ecken und Kanten abgerundet sind, wobei die Breiten der Nuten und Erhebungen etwa gleich groß sind.It is also advantageous that the cylindrical portion of the mixing shaft has elongated grooves and elevations whose corners and edges are rounded, wherein the widths of the grooves and elevations are approximately equal.

Im nun Folgenden wird die Erfindung anhand von Zeichnungen im Detail näher erläutert. Es zeigt

Fig. 1:
eine perspektivische Darstellung des Mischaggregats (2) einer Anlage zur Durchmischung und Zerteilung von Lebensmittelprodukten;
Fig. 2:
eine perspektivische Darstellung der erfindungsgemäßen Mischwelle (1) mit ihrem Stahlkern (3) und dem Kunststoffüberzug (6);
Fig. 3:
einen Ausschnitt aus der Oberfläche des Stahlkerns (3).
In the following, the invention will be explained in more detail with reference to drawings. It shows
Fig. 1:
a perspective view of the mixing unit (2) of a plant for mixing and fragmentation of food products;
Fig. 2:
a perspective view of the mixing shaft (1) according to the invention with its steel core (3) and the plastic coating (6);
3:
a section of the surface of the steel core (3).

Die Fig. 1 zeigt eine perspektivische schematische Darstellung des Aggregats 2, in das die erfindungsgemäße Mischwelle 1 eingebaut ist. Die Mischwelle wird weiter unten näher beschrieben. Die Mischwelle 1 weist an ihrem einen Ende ein weiteres Arbeitswerkzeug 8 auf, an dem sich die gesamte Welle abstützt Am anderen Ende der Mischwelle 1 weist der Stahlkern 3 eine Befestigungsschraube 16 auf, mit der die Mischwelle 1 gegen das Arbeitswerkzeug gedrückt wird. In den Wänden 10 des Produktaggregats 2 ist mindestens eine Injektionsdüse 11 angeordnet, mit der beliebige Mittel in das Innere des Produktaggregats 2 injiziert werden. Die Mischwelle 1 wird mit Umdrehungen zwischen 300 bis 3.000 Umdrehungen pro Minute angetrieben.The Fig. 1 shows a perspective schematic representation of the unit 2, in which the mixing shaft 1 according to the invention is installed. The mixing shaft will be described below. The mixing shaft 1 has at its one end another working tool 8, on which the entire shaft is supported. At the other end of the mixing shaft 1, the steel core 3 has a fastening screw 16, with which the mixing shaft 1 is pressed against the working tool. In the walls 10 of the product unit 2 at least one injection nozzle 11 is arranged, are injected with the arbitrary means in the interior of the product unit 2. The mixing shaft 1 is driven with revolutions between 300 to 3,000 revolutions per minute.

Die Fig. 2 zeigt in perspektivischer Darstellung eine Teilschnittdarstellung der erfindungsgemäßen Mischwelle 1. Die Mischwelle 1 besteht im Wesentlichen aus einem länglichen zylindrischen Stahlkern 3, der von einem Kunststoffüberzug 6 umgeben ist. Der Stahlkern 3 weist mittig eine Bohrung 17 auf, in der ein Bolzen 18 mit einem Gewinde geführt wird, hier nicht gezeigt, mit dem die Mischwelle 1 mit einer Schraube 16 gegen das Arbeitswerkzeug gedrückt wird. Sowohl die Oberfläche des Flansches als auch der gesamte zylindrische Abschnitt 7 des Stahlkerns 3, mit Ausnahme der Stirnflächen 19, sind von einem einzigen Kunststoffüberzug 6 umgeben. Die Oberfläche des Kunststoffüberzug 6 selbst ist strukturiert und weist im vorliegenden Ausführungsbeispiel radial abstehende Mischelemente 4 auf, deren Abstände (A) unterschiedlich sind und über den gesamten Oberflächenumfang der Mischwelle 1 quasi unregelmäßig verteilt sind. Der Überzug 6 ist im vorliegenden Ausführungsbeispiel ein sogenannter PTFE (Polytetrafluorethylen), der bei relativ hohem Druck isostatisch aufgepresst und bei Temperaturen zwischen 360 °C und 380 °C gesintert wird. Wegen der unterschiedlichen Ausdehnungskoeffizienten von Kunststoff und Stahl bilden sich in der Regel an den Grenzflächen 20 der Materialien zwischen Überzug und Stahlkern Luftspalte, in die Produktreste eindringen und nicht mehr zu entfernen sind. Infolge des speziellen Verbindungsverfahrens des Kunststoffüberzugs auf den Stahlkern 3 der Mischwelle 1 bleibt aber eine Restspannung des Kunststoffüberzugs 6 auf der Oberfläche des Stahlkerns 3, so dass eine makroskopische Spaltbildung praktisch unmöglich ist. Um dem Kunststoffüberzug 6 auf der Oberfläche des länglichen Teils der Mischwelle 1 einen sicheren Halt zu bieten, ist die Oberfläche des Stahlkerns 3 strukturiert ausgeführt. Im vorliegenden Ausführungsbeispiel wird die Struktur aus länglichen Nuten 12 und länglichen Erhebungen 13 über einen Teil des zylindrischen Abschnitts des Stahlkerns 3 gebildet. Die Tiefe der Nuten beträgt etwa 2 mm und die Breiten der Nuten 12 und der Erhebungen liegen zwischen 6 mm und 10 mm. Die Nuten 12 enden kurz vor der Stirnseite des zylindrischen Abschnitts 7 der Mischwelle 1, wodurch eine zusätzliche Rutschstabilität für den Kunststoffüberzug 6 gegeben wird. Ferner ist es für manchen Ausführungsbeispiele vorteilhaft, die gesamte Oberfläche, mit Ausnahme der Stirnflächen, des zylindrischen Abschnitts der Mischwelle 1 aufzurauen, wodurch der Kunststoffüberzug in die Poren der Aufrauung dringen kann.The Fig. 2 shows a perspective view of a partial sectional view of the mixing shaft according to the invention 1. The mixing shaft 1 consists essentially of an elongated cylindrical steel core 3, which is surrounded by a plastic coating 6. The steel core 3 has a bore 17 in the center, in which a bolt 18 is guided with a thread, not shown here, with which the mixing shaft 1 is pressed with a screw 16 against the working tool. Both the surface of the flange and the entire cylindrical portion 7 of the steel core 3, with the exception of the end faces 19, are surrounded by a single plastic coating 6. The surface of the plastic coating 6 itself is structured and has, in the present exemplary embodiment, radially projecting mixing elements 4 whose distances (A) are different and are distributed over the entire surface circumference of the mixing shaft 1 quasi irregular. The coating 6 is in the present embodiment, a so-called PTFE (polytetrafluoroethylene), which is isostatic pressed at a relatively high pressure and sintered at temperatures between 360 ° C and 380 ° C. Because of the different coefficients of expansion of plastic and steel, air gaps are generally formed at the boundary surfaces 20 between the coating and the steel core, in which product residues penetrate and can no longer be removed. Due to the special bonding method of the plastic coating on the steel core 3 of the mixing shaft 1 but a residual stress of the plastic coating 6 remains on the surface of the steel core 3, so that a macroscopic gap formation is virtually impossible. In order to provide the plastic coating 6 on the surface of the elongated part of the mixing shaft 1 a secure fit, the surface of the steel core 3 is executed structured. In the present embodiment, the structure of elongated grooves 12 and elongated protrusions 13 is formed over a part of the cylindrical portion of the steel core 3. The depth of the grooves is about 2 mm and the widths of the grooves 12 and the elevations are between 6 mm and 10 mm. The grooves 12 terminate shortly before the end face of the cylindrical portion 7 of the mixing shaft 1, whereby an additional slip resistance for the plastic coating 6 is given. Further, for some embodiments, it is advantageous to roughen the entire surface, with the exception of the end faces, of the cylindrical portion of the mixing shaft 1, whereby the plastic coating can penetrate into the pores of the roughening.

Claims (14)

  1. Mixing shaft (1) for thorough mixing and cuting of food products in an assembly (2) with a steel core (3) exhibiting a coated plastic (6) wherein on an elongated cylindrical section (7) mixing elements (4) are disposed in a predetermined distance (A), characterized in that the mixing elements (4) are components of the coating (6) and the steel core (3) exhibits a structure surface (5) formed on the elongated cylindrical section (7) of the steel core (3) of mixing shaft by elongated grooves (12) and elongated projections (13).
  2. Mixing shaft (1) according to claim 1 characterized in that the coating (6) is a PTFE.
  3. Mixing shaft (1) according to claim 1 characterized in that the steel core (3) is made of stainless steel.
  4. Mixing shaft (1) according to claim 1 characterized in that a flange (8) is arranged at one end of the elongated section (7).
  5. Mixing shaft (1) according to claim 1 characterized in that the distances (A) are furnished irregular.
  6. Mixing shaft (1) according to one of the preceding claims characterized in that the elongated cylindrical section (7) is disposed in an elongated product chamber (9).
  7. Mixing shaft (1) according to claim 6 characterized in that at least one injection nozzle (11) is disposed at the product chamber wall (10).
  8. Mixing shaft (1) according to one of the preceding claims characterized in that the plastic coating (6) is pressed on isostatically at high pressure, then is sintered at high temperatures and in the following worked by metal cutting and machining away.
  9. Mixing shaft (1) according to one of the preceding claims characterized in that the surface of the plastic coating (6) is polished.
  10. Mixing shaft (1) according to one of the preceding claims characterized in that the plastic coating (6) is pressed on with an isostatic pressure of about 300 bar to 350 bar onto the steel core (3) of the mixing shaft (1).
  11. Mixing shaft (1) according to one of the preceding claims 8 to 10 characterized in that the plastic coating (6) is sintered at temperatures from about 360 degrees centigrade to 380 degrees centigrade after the isostatic pressure application.
  12. Mixing shaft (1) according to one of the preceding claims characterized in that the corners (14) and edges (15) of the elongated grooves (12) and elongated projections (13) are formed rounded.
  13. Mixing shaft (1) according to one of the preceding claims characterized in that the width of the grooves (12) and the projections (13) are approximately of equal size.
  14. Method for the production of a coating (6) on a surface of a steel core (3) of a mixing shaft (1) for thorough mixing and cuting of food products in an aggregate (2) with the aid of a processing method of PTFE under pressure characterized in that a coating (6) with mixing elements (4) is applied onto the structured surface of the steel core (3) at isostatic pressure (p) and at increased temperatures (T).
EP04762574A 2003-08-02 2004-08-02 Mixing shaft for thorough mixing and comminuting of food products Active EP1663465B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL04762574T PL1663465T3 (en) 2003-08-02 2004-08-02 Mixing shaft for thorough mixing and comminuting of food products

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10335552A DE10335552B4 (en) 2003-08-02 2003-08-02 Mixing shaft for mixing and dividing food products and method for producing a coating for such a mixing shaft
PCT/DE2004/001729 WO2005014152A2 (en) 2003-08-02 2004-08-02 Mixing shaft for thorough mixing and comminuting of food products

Publications (2)

Publication Number Publication Date
EP1663465A2 EP1663465A2 (en) 2006-06-07
EP1663465B1 true EP1663465B1 (en) 2008-02-27

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Application Number Title Priority Date Filing Date
EP04762574A Active EP1663465B1 (en) 2003-08-02 2004-08-02 Mixing shaft for thorough mixing and comminuting of food products

Country Status (6)

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US (1) US8833688B2 (en)
EP (1) EP1663465B1 (en)
AT (1) ATE387257T1 (en)
DE (2) DE10335552B4 (en)
PL (1) PL1663465T3 (en)
WO (1) WO2005014152A2 (en)

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KR101040927B1 (en) 2011-03-30 2011-06-16 (주)플록마스터 Mixing apparatus for sludge spallation
CN103363813B (en) * 2013-06-20 2014-11-12 宁波长振铜业有限公司 Smelting device with automatic smashing and stirring devices
CA2937568C (en) 2014-03-17 2022-01-11 Sani-Tech West, Inc. Magnetic mixing system and method
US11103245B2 (en) * 2018-12-31 2021-08-31 Cilag Gmbh International Knife for surgical stapler and associated method of manufacture with MIM and hip
DE102019125593A1 (en) * 2019-09-24 2021-03-25 Thomas Molé Modular mixing tool

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Also Published As

Publication number Publication date
US20070125894A1 (en) 2007-06-07
DE10335552A1 (en) 2005-03-17
DE10335552B4 (en) 2005-07-28
DE502004006334D1 (en) 2008-04-10
EP1663465A2 (en) 2006-06-07
WO2005014152A3 (en) 2005-04-21
ATE387257T1 (en) 2008-03-15
US8833688B2 (en) 2014-09-16
PL1663465T3 (en) 2008-10-31
WO2005014152A2 (en) 2005-02-17

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