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EP0676280A1 - Method and device for applying powdered lubricant or release agent onto the pressing tools in tabletting machines - Google Patents

Method and device for applying powdered lubricant or release agent onto the pressing tools in tabletting machines Download PDF

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Publication number
EP0676280A1
EP0676280A1 EP95104525A EP95104525A EP0676280A1 EP 0676280 A1 EP0676280 A1 EP 0676280A1 EP 95104525 A EP95104525 A EP 95104525A EP 95104525 A EP95104525 A EP 95104525A EP 0676280 A1 EP0676280 A1 EP 0676280A1
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EP
European Patent Office
Prior art keywords
nozzle
blowing
opening
die
separating agent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95104525A
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German (de)
French (fr)
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EP0676280B1 (en
EP0676280B2 (en
Inventor
Jürgen Dipl.-Ing. Hinzpeter (FH)
Ulrich Ing. Zeuschner
Hans-Joachim Dipl.-Ing. Pierags (Fh)
Peter Dipl.-Ing. Lüneburg (FH)
Elke Ing. Wittenberg
Ulrich Ing. Arndt
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Fette GmbH
Original Assignee
Wilhelm Fette GmbH
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Application filed by Wilhelm Fette GmbH filed Critical Wilhelm Fette GmbH
Publication of EP0676280A1 publication Critical patent/EP0676280A1/en
Publication of EP0676280B1 publication Critical patent/EP0676280B1/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/76—Prevention of microwave leakage, e.g. door sealings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0005—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for briquetting presses
    • B30B15/0011—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for briquetting presses lubricating means

Definitions

  • the invention relates to a method for applying metered amounts of powdered lubricant or separating agent to the claimed surfaces of pressing tools in tableting machines.
  • Rotary tableting machines such as are described, for example, in EP 0 572 816, have a die plate which is driven to rotate about a vertical axis and which contains die holes arranged on a circle.
  • Upper and lower stamps are assigned to the die holes circulate synchronously with the die plate and press powdered material filled into the die holes into the die hole.
  • the stamps are actuated by suitable control cams in order to either open the die holes or to carry out the pressing process.
  • the lower ram When filling in a filling station, the lower ram is in a lower position in the die hole, while the upper ram is at a distance from the die plate.
  • a lubricant or separating agent is required to prevent the tablet from sticking to the pressing tool and excessive friction when the tablets are ejected from the die holes. It is known to use magnesium stearate as the powdery release agent. From DE 38 11 261 it has also become known to use finely divided liquids in gases.
  • Another possibility is to apply the lubricant to the die bore and lower punch, for example by pulsed blowing, as described in DE 38 11 260.
  • a Venturi nozzle is placed directly in front of the punch and the die opening in a tabletting machine.
  • a controlled supply of compressed air ensures that so-called powder packets are ejected onto the stressed surfaces.
  • the known device is relatively complex, in particular with regard to the control and involves the risk that too much sliding material is released, which then undesirably settles on the surfaces adjacent to the die hole and the punch shafts.
  • the known method can only be carried out at relatively low speeds.
  • the invention has for its object to provide a method for applying metered amounts of powdered lubricant and release agent to the claimed surfaces of pressing tools in tableting machines, which requires a minimal amount of lubricant and release agent and works effectively even at very high speeds.
  • the separating agent is continuously blown onto the stressed areas during operation of the tabletting machine, and excess separating agent is continuously sucked off in the areas adjacent to the stressed areas.
  • the separating agent is continuously applied to the punches and into the die bore, so that there is no upper limit with regard to the speed.
  • the amount of lubricant applied to the stressed surfaces is metered and can be kept very small.
  • excess release agent that does not get onto the stressed surfaces and spreads more or less "cloud-like" above the die plate is sucked off, so that they actually affect the stressed Areas or the amount of release agent deposited on the tablet is extremely small, preferably less than 0.02%, based on the substance to be compressed.
  • the lubricant and release agent is used in precisely dosed amounts e.g. swirled in a Venturi nozzle, from which it is then directed to a suitable blowing nozzle in the tabletting machine.
  • a suitable blowing nozzle in the tabletting machine.
  • a kind of swirl chamber effect is achieved in the die hole, enhanced by suction through a suitable suction nozzle.
  • a homogeneous, very low coating of the die wall and the stamp press surfaces is obtained.
  • the reduction of lubricants and release agents in the tablets has the further advantage that the desired tablet hardness can be achieved with a considerably reduced compression pressure. This results in less tool wear and a shorter disintegration time of the tablets. Finally, the reduction of the lubricant and release agent also reduces the corresponding material expenditure for this.
  • So-called double rotary machines are known in which the manufacture of a tablet takes place in half an orbit of the die plates. Accordingly, two filling stations are assigned to the die plate.
  • the possibility of applying lubricant provided in the direction of travel in front of the respectively not used filling device is activated and the possibility of application arranged in front of the used filling station is deactivated. This prevents lubricant from being sprayed onto the material in the die holes.
  • a blowing nozzle is arranged above the die disk at a short distance from it, with a lower nozzle opening aligned with the orbit of the die holes and a nozzle opening aligned with the orbit of the upper punches.
  • the nozzle openings are preferably formed as radially arranged slots which can have approximately the length of the diameter of a die hole.
  • the lower suction opening has a smaller one Distance to the die plate as the lower blow nozzle opening. Excess material can thereby be effectively sucked off from the surface of the die plate in order to prevent material build-up on the die plate.
  • the distance between the upper suction opening and the upper stamp must be set larger so that no material adhering to the upper stamp is sucked off and coating of the stamp shaft is avoided.
  • the blowing nozzle is preferably arranged upstream of the suction nozzle.
  • the single figure shows a section through a die plate in the area of an upper and a lower punch with a device according to the invention.
  • a die plate 10 of a tabletting machine (not shown in the following) can be seen, which has die holes arranged on a circle, one of which can be seen at 12.
  • An upper punch 14 and a lower punch 15 are assigned to the die hole 12. They interact in a known manner with the die plate 10, as described, for example, in EP 0 572 816 and move in the direction of the arrows shown.
  • EP 0 572 816 the die plate 10 of a tabletting machine
  • a stationary blowing nozzle 16 with a lower nozzle opening 18 and an upper nozzle opening 19.
  • the nozzle openings 18, 19 are slot-like and extend radially with respect to the die plate 10, so that they can extend approximately over the diameter of the die hole 12 .
  • the tube-like or box-like nozzle 16 is connected to a Venturi nozzle, not shown, in which gaseous medium, for example air and a pulverulent release agent and lubricant, for example magnesium stearate, are mixed homogeneously.
  • the air-release agent mixture is introduced under pressure into the blowing nozzle 16 and emerges from the upper and lower nozzle openings 19, 18 according to the arrows shown, namely against the pressing surface of the upper punch 14 and against the walls of the die hole 12 and the pressing surface of the Lower punch 15.
  • a suction nozzle 20 is arranged in a stationary manner, one wall of which is formed by the associated wall of the blowing nozzle 16. It is box-shaped in cross section and connected to a vacuum source, not shown. It has an upper suction opening 22 and a lower suction opening 24.
  • the distance A is between the lower The opening 24 and the upper side of the die plate 10 are relatively small, in any case smaller than the distance between the lower nozzle opening 18 and the die plate 10. It is, for example, only 0.5 mm.
  • the distance B between the pressing surface of the upper punch 14 and the nozzle opening 19 or the upper suction opening 22 is somewhat larger and is, for example, 1.5 mm, the same value as the distance between the lower nozzle opening 18 and the die plate 10.
  • the excess mixture of air and powdered release agent is sucked in through the blowing nozzle 20, as shown by the corresponding arrows. Therefore, no substance can be deposited on the die plate 10, not even on the shaft of the upper punch 14.
  • the distances mentioned and the nozzle openings as well as the air quantity and the air pressure or the quantity of the lubricant are matched to one another in such a way that only a minimal quantity the stressed surfaces of the pressing tools is applied and all excess material is removed via the suction nozzle 20. From there, it is taken to a suitable disposal together with the material dust from the tabletting machine.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Medical Preparation Storing Or Oral Administration Devices (AREA)
  • Forging (AREA)
  • Coating Apparatus (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Medicinal Preparation (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Abstract

The powdered lubricant or separator is blown continuously through a blow nozzle (16) onto the stressed surfaces as the tablet pressing machine is being operated. Excess powder is continuously sucked up from the areas adjoining the stressed surfaces. The blow nozzle is mounted at a slight distance above the matrix disc (10) with its lower nozzle opening (18) directed towards the revolving path of the matrix holes (12) and its upper nozzle opening (19) directed towards the revolving path of the upper ram (14). A suction nozzle (20) with upper and lower suction openings (22,24) adjoins the blow nozzle. <IMAGE>

Description

Die Erfindung bezieht sich auf ein Verfahren zum Aufbringen von dosierten Mengen von pulverförmigem Schmier- oder Trennmittel auf die beanspruchten Flächen von Preßwerkzeugen in Tablettiermaschinen nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for applying metered amounts of powdered lubricant or separating agent to the claimed surfaces of pressing tools in tableting machines.

Rundläufer-Tablettiermaschinen, wie sie z.B. in der EP 0 572 816 beschrieben sind, weisen eine um eine vertikale Achse drehend angetriebene Matrizenscheibe auf, die auf einem Kreis angeordnete Matrizenlöcher enthält. Den Matrizenlöchern sind Ober- und Unterstempel zugeordnet, die synchron mit der Matrizenscheibe umlaufen und in die Matrizenlöcher eingefülltes pulverförmiges Material in dem Matrizenloch verpressen. Die Stempel werden von geeigneten Steuerkurven betätigt, um die Matrizenlöcher wahlweise freizugeben bzw. den Preßvorgang auszuführen. Beim Befüllen in einer Füllstation befindet sich der untere Preßstempel in einer unteren Position im Matrizenloch, während der Oberstempel sich in einem Abstand zur Matritzenscheibe befindet.Rotary tableting machines, such as are described, for example, in EP 0 572 816, have a die plate which is driven to rotate about a vertical axis and which contains die holes arranged on a circle. Upper and lower stamps are assigned to the die holes circulate synchronously with the die plate and press powdered material filled into the die holes into the die hole. The stamps are actuated by suitable control cams in order to either open the die holes or to carry out the pressing process. When filling in a filling station, the lower ram is in a lower position in the die hole, while the upper ram is at a distance from the die plate.

Beim Verpressen vieler Substanzen ist ein Gleit- oder Trennmittel erforderlich, das ein Verkleben der Tablette am Preßwerkzeug verhindern soll sowie eine zu starke Reibung beim Ausstoßen der Tabletten aus den Matrizenlöchern. Es ist bekannt, als pulverförmiges Trennmittel Magnesiumstearat zu verwenden. Aus der DE 38 11 261 ist auch bekannt geworden, in Gasen fein verteilte Flüssigkeiten zu verwenden.When many substances are pressed, a lubricant or separating agent is required to prevent the tablet from sticking to the pressing tool and excessive friction when the tablets are ejected from the die holes. It is known to use magnesium stearate as the powdery release agent. From DE 38 11 261 it has also become known to use finely divided liquids in gases.

Es ist bekannt, das Gleitmittel in dem zu verpressenden Material fein zu verteilen, z.B. durch Einmischen oder Besprühen des zu verpressenden Materials mit Magnesiumstearat. Der Anteil an Gleitmittel beträgt dabei 0,5 bis 1 % des zu verpressenden Materials. Die relativ hohe Konzentration des Gleitmittels ist erforderlich, um an der Tablettenoberfläche eine ausreichende Menge zu erhalten, die ein Verkleben von Tablette und Werkzeug unterbindet. In vielen Fällen ist jedoch eine derartig hohe Konzentration von Gleitmittel unerwünscht.It is known to finely distribute the lubricant in the material to be pressed, for example by mixing or spraying the material to be pressed with magnesium stearate. The proportion of lubricant is 0.5 to 1% of the material to be pressed. The relatively high concentration of the lubricant is required in order to To obtain a sufficient amount of tablet surface that prevents the tablet and tool from sticking together. In many cases, however, such a high concentration of lubricant is undesirable.

Eine andere Möglichkeit besteht darin, das Gleitmittel auf Matrizenbohrung und Unterstempel aufzubringen, beispielsweise durch taktweises Beblasen, wie dies in der DE 38 11 260 beschrieben ist. Eine Venturidüse wird direkt vor dem Stempel und der Matrizenöffnung in einer Tablettiermaschine angeordnet. Eine gesteuerte Druckluftzufuhr sorgt für das Ausstoßen von sogenannten Pulverpaketen auf die beanspruchten Flächen. Die bekannte Vorrichtung ist relativ aufwendig, insbesondere im Hinblick auf die Steuerung und beinhaltet die Gefahr, daß zu viel Gleitmaterial abgegeben wird, das sich dann in unerwünschter Weise auf den der Matrizenbohrung benachbarten Flächen und den Stempelschäften absetzt. Außerdem läßt sich das bekannte Verfahren nur bei relativ geringen Geschwindigkeiten durchführen.Another possibility is to apply the lubricant to the die bore and lower punch, for example by pulsed blowing, as described in DE 38 11 260. A Venturi nozzle is placed directly in front of the punch and the die opening in a tabletting machine. A controlled supply of compressed air ensures that so-called powder packets are ejected onto the stressed surfaces. The known device is relatively complex, in particular with regard to the control and involves the risk that too much sliding material is released, which then undesirably settles on the surfaces adjacent to the die hole and the punch shafts. In addition, the known method can only be carried out at relatively low speeds.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Aufbringen von dosierten Mengen von pulverförmigem Schmier- und Trennmittel auf die beanspruchten Flächen von Preßwerkzeugen in Tablettiermaschinen anzugeben, das mit einem minimalen Anteil an Gleit- und Trennmittel auskommt und auch bei sehr hohen Geschwindigkeiten wirksam arbeitet.The invention has for its object to provide a method for applying metered amounts of powdered lubricant and release agent to the claimed surfaces of pressing tools in tableting machines, which requires a minimal amount of lubricant and release agent and works effectively even at very high speeds.

Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.This object is achieved by the features of patent claim 1.

Bei erfindungsgemäßen Verfahren wird das Trennmittel während des Betriebs der Tablettiermaschine kontinuierlich auf die beanspruchten Flächen geblasen, und überschüssiges Trennmittel in den beanspruchten Flächen benachbarten Bereichen kontinuierlich abgesaugt.In the method according to the invention, the separating agent is continuously blown onto the stressed areas during operation of the tabletting machine, and excess separating agent is continuously sucked off in the areas adjacent to the stressed areas.

Beim erfindungsgemäßen Verfahren wird das Trennmittel auf die Stempel und in die Matrizenbohrung kontinuierlich auf- bzw. eingetragen, so daß im Hinblick auf die Geschwindigkeit keine obere Begrenzung besteht. Die auf die beanspruchten Flächen aufgebrachte Gleitmittelmenge ist dosiert und kann sehr klein gehalten werden. Erfindungswesentlich ist jedoch ferner, daß gleichzeitig mit dem Aufblasen ein Absaugen von Gleitmittel stattfindet, und zwar unmittelbar benachbart den beanspruchten Flächen. Dadurch wird überschüssiges Trennmittel, das nicht auf die beanspruchten Flächen gelangt und sich mehr oder weniger "wolkenartig" oberhalb der Matrizenscheibe verbreitet, abgesaugt, so daß die tatsächlich sich auf den beanspruchten Flächen bzw. auf der Tablette absetzende Trennmittelmenge äußerst gering ist, vorzugsweise kleiner als 0,02 %, bezogen auf die zu verpressende Substanz.In the method according to the invention, the separating agent is continuously applied to the punches and into the die bore, so that there is no upper limit with regard to the speed. The amount of lubricant applied to the stressed surfaces is metered and can be kept very small. However, it is also essential to the invention that lubricant is sucked off simultaneously with the inflation, directly adjacent to the surfaces claimed. As a result, excess release agent that does not get onto the stressed surfaces and spreads more or less "cloud-like" above the die plate is sucked off, so that they actually affect the stressed Areas or the amount of release agent deposited on the tablet is extremely small, preferably less than 0.02%, based on the substance to be compressed.

Das Gleit- und Trennmittel wird in genau dosierten Mengen z.B. in einer Venturidüse verwirbelt, von der es anschließend zu einer geeigneten Blasdüse in der Tablettiermaschine geleitet wird. Durch entsprechende Abstimmung von Größe und Form der Düsenöffnung, des Blasdruckes sowie des Abstands der Blasdüse zum Oberstempel und zur Matrizenscheibe wird eine gleichmäßige Verteilung des Gleitmittels am Oberstempel und in der Matrizenbohrung erreicht. In der Matrizenbohrung wird eine Art Wirbelkammereffekt erreicht, verstärkt durch das Absaugen über eine geeignete Saugdüse. Man erhält eine homogene sehr geringe Beschichtung der Matrizenwandung und der Stempelpreßflächen.The lubricant and release agent is used in precisely dosed amounts e.g. swirled in a Venturi nozzle, from which it is then directed to a suitable blowing nozzle in the tabletting machine. By appropriately matching the size and shape of the nozzle opening, the blowing pressure and the distance of the blowing nozzle to the upper punch and the die plate, an even distribution of the lubricant on the upper punch and in the die hole is achieved. A kind of swirl chamber effect is achieved in the die hole, enhanced by suction through a suitable suction nozzle. A homogeneous, very low coating of the die wall and the stamp press surfaces is obtained.

Die Reduzierung von Gleit- und Trennmittel in den Tabletten hat den weiteren Vorteil, daß die gewünschte Tablettenhärte mit einem erheblich verringerten Preßdruck erreicht werden kann. Dadurch wird ein geringerer Werkzeugverschleiß und eine kürzere Zerfallzeit der Tabletten erhalten. Schließlich verringert die Reduzierung des Gleit- und Trennmittels auch den entsprechenden Materialaufwand hierfür.The reduction of lubricants and release agents in the tablets has the further advantage that the desired tablet hardness can be achieved with a considerably reduced compression pressure. This results in less tool wear and a shorter disintegration time of the tablets. Finally, the reduction of the lubricant and release agent also reduces the corresponding material expenditure for this.

Es sind sogenannte Doppelrundläufermaschinen bekannt, bei denen die Herstellung einer Tablette auf einer halben Umlaufbahn der Matrizenscheiben vor sich geht. Es sind demgemäß zwei Füllstationen der Matrizenscheibe zugeordnet. Bei derartigen Rundläufermaschinen ist nach einer Ausgestaltung des erfindungsgemäßen Verfahrens vorgesehen, daß die in Laufrichtung vor der jeweils nicht benutzten Füllvorrichtung vorgesehene Auftragemöglichkeit von Gleitmittel aktiviert und die vor der benutzten Füllstation angeordnete Auftragmöglichkeit inaktiviert wird. Dadurch wird vermieden, daß auf das in den Matrizenlöchern befindliche Material Gleitmittel aufgesprüht wird.So-called double rotary machines are known in which the manufacture of a tablet takes place in half an orbit of the die plates. Accordingly, two filling stations are assigned to the die plate. In such rotary machines, according to an embodiment of the method according to the invention it is provided that the possibility of applying lubricant provided in the direction of travel in front of the respectively not used filling device is activated and the possibility of application arranged in front of the used filling station is deactivated. This prevents lubricant from being sprayed onto the material in the die holes.

Es sind verschiedene konstruktive Lösungen denkbar, das erfindungsgemäße Verfahren durchzuführen. Eine besteht nach einer Ausgestaltung der Erfindung darin, daß oberhalb der Matrizenscheibe in geringem Abstand zu dieser eine Blasdüse angeordnet ist mit einer zur Umlaufbahn der Matrizenlöcher ausgerichteten unteren Düsenöffnung und einer zur Umlaufbahn der Oberstempel ausgerichteten Düsenöffnung. Die Düsenöffnungen sind nach einer weiteren Ausgestaltung der Erfindung vorzugsweise als radial angeordnete Schlitze gebildet, die etwa die Länge des Durchmessers eines Matrizenloches aufweisen können. Die untere Saugöffnung hat nach einer Ausgestaltung der Erfindung einen geringeren Abstand zur Matrizenscheibe als die untere Blasdüsenöffnung. Dadurch kann überschüssiges Material wirksam von der Oberfläche der Matrizenscheibe abgesaugt werden, um einen Materialaufbau auf der Matrizenscheibe zu verhindern. Der Abstand der oberen Ansaugöffnung zum Oberstempel muß größer eingestellt sein, damit kein an den Oberstempeln haftendes Material abgesaugt und ein Beschichten des Stempelschaftes vermieden wird. Vorzugsweise wird die Blasdüse in Laufrichtung vor der Saugdüse angeordnet.Various constructive solutions are conceivable for carrying out the method according to the invention. According to one embodiment of the invention, a blowing nozzle is arranged above the die disk at a short distance from it, with a lower nozzle opening aligned with the orbit of the die holes and a nozzle opening aligned with the orbit of the upper punches. According to a further embodiment of the invention, the nozzle openings are preferably formed as radially arranged slots which can have approximately the length of the diameter of a die hole. According to one embodiment of the invention, the lower suction opening has a smaller one Distance to the die plate as the lower blow nozzle opening. Excess material can thereby be effectively sucked off from the surface of the die plate in order to prevent material build-up on the die plate. The distance between the upper suction opening and the upper stamp must be set larger so that no material adhering to the upper stamp is sucked off and coating of the stamp shaft is avoided. The blowing nozzle is preferably arranged upstream of the suction nozzle.

Die Erfindung wird nachfolgend anhand einer Zeichnung näher erläutert.The invention is explained in more detail below with reference to a drawing.

Die einzige Figur zeigt einen Schnitt durch eine Matrizenscheibe im Bereich eines Ober- und eines Unterstempels mit einer Vorrichtung nach der Erfindung.The single figure shows a section through a die plate in the area of an upper and a lower punch with a device according to the invention.

In der Figur ist eine Matrizenscheibe 10 einer im weiteren nicht dargestellten Tablettiermaschine zu erkennen, die auf einem Kreis angeordnet Matrizenlöcher aufweist, von denen eines bei 12 zu erkennen ist. Dem Matrizenloch 12 ist ein Oberstempel 14 und ein Unterstempel 15 zugeordnet. Sie wirken in bekannter Weise mit der Matrizenscheibe 10 zusammen, wie etwa in der EP 0 572 816 beschrieben und bewegen sich in Richtung der eingezeichneten Pfeile. Auf die Funktion und den Aufbau einer Tablettiermaschine wird im weiteren nicht näher eingegangen.In the figure, a die plate 10 of a tabletting machine (not shown in the following) can be seen, which has die holes arranged on a circle, one of which can be seen at 12. An upper punch 14 and a lower punch 15 are assigned to the die hole 12. They interact in a known manner with the die plate 10, as described, for example, in EP 0 572 816 and move in the direction of the arrows shown. On the The function and structure of a tablet machine will not be discussed in more detail below.

Oberhalb der Matrizenscheibe 10 ist stationär eine Blasdüse 16 angeordnet mit einer unteren Düsenöffnung 18 und einer oberen Düsenöffnung 19. Die Düsenöffnungen 18, 19 sind schlitzartig und erstrecken sich radial bezüglich der Matrizenscheibe 10, so daß sie sich etwa über den Durchmesser des Matrizenloches 12 erstrecken können. Die rohrartige oder kastenartige Düse 16 ist an eine nicht gezeigte Venturidüse angeschlossen, in der gasförmiges Medium, z.B. Luft und ein pulverförmiges Trenn- und Gleitmittel, z.B. Magnesiumstearat, homogen gemischt werden. Das Luft-Trennmittelgemisch wird unter Druck in die Blasdüse 16 eingebracht und tritt entsprechend den gezeigten Pfeilen aus der oberen und der unteren Düsenöffnung 19, 18 aus, und zwar gegen die Preßfläche des Oberstempels 14 gerichtet und gegen die Wände des Matrizenloches 12 und die Preßfläche des Unterstempels 15. Unmittelbar benachbart zur Blasdüse 16 ist stationär eine Absaugdüse 20 angeordnet, deren eine Wand von der zugeordneten Wand der Blasdüse 16 gebildet ist. Sie ist im Querschnitt kastenförmig und an eine nicht gezeigte Unterdruckquelle angeschlossen. Sie besitzt eine obere Ansaugöffnung 22 und eine untere Ansaugöffnung 24. Wie erkennbar, ist der Abstand A zwischen der unteren Öffnung 24 und der Oberseite der Matrizenscheibe 10 relativ klein, auf jeden Fall kleiner als der Abstand der unteren Düsenöffnung 18 von der Matrizenscheibe 10. Er beträgt z.B. nur 0,5 mm. Der Abstand B zwischen der Preßfläche des Oberstempels 14 und der Düsenöffnung 19 bzw. der oberen Ansaugöffnung 22 ist etwas größer und beträgt z.B. 1,5 mm, den gleichen Wert, den der Abstand der unteren Düsenöffnung 18 von der Matrizenscheibe 10 hat. Das überschüssige Gemisch aus Luft und pulverförmigem Trennmittel wird durch die Blasdüse 20 eingesaugt, wie durch die entsprechenden Pfeile dargestellt. Es kann sich daher keine Substanz auf der Matrizenscheibe 10 ablagern, auch nicht auf dem Schaft des Oberstempels 14. Die erwähnten Abstände und die Düsenöffnungen sowie die Luftmenge und der Luftdruck bzw. die Menge des Gleitmittels sind so aufeinander abgestimmt, daß nur eine minimale Menge auf die beanspruchten Flächen der Preßwerkzeuge aufgebracht wird und alles überschüssige Material über die Saugdüse 20 entfernt wird. Von dort gelangt es zusammen mit dem Materialstaub aus der Tablettiermaschine zu einer geeigneten Entsorgung.Above the die plate 10 there is a stationary blowing nozzle 16 with a lower nozzle opening 18 and an upper nozzle opening 19. The nozzle openings 18, 19 are slot-like and extend radially with respect to the die plate 10, so that they can extend approximately over the diameter of the die hole 12 . The tube-like or box-like nozzle 16 is connected to a Venturi nozzle, not shown, in which gaseous medium, for example air and a pulverulent release agent and lubricant, for example magnesium stearate, are mixed homogeneously. The air-release agent mixture is introduced under pressure into the blowing nozzle 16 and emerges from the upper and lower nozzle openings 19, 18 according to the arrows shown, namely against the pressing surface of the upper punch 14 and against the walls of the die hole 12 and the pressing surface of the Lower punch 15. Immediately adjacent to the blowing nozzle 16, a suction nozzle 20 is arranged in a stationary manner, one wall of which is formed by the associated wall of the blowing nozzle 16. It is box-shaped in cross section and connected to a vacuum source, not shown. It has an upper suction opening 22 and a lower suction opening 24. As can be seen, the distance A is between the lower The opening 24 and the upper side of the die plate 10 are relatively small, in any case smaller than the distance between the lower nozzle opening 18 and the die plate 10. It is, for example, only 0.5 mm. The distance B between the pressing surface of the upper punch 14 and the nozzle opening 19 or the upper suction opening 22 is somewhat larger and is, for example, 1.5 mm, the same value as the distance between the lower nozzle opening 18 and the die plate 10. The excess mixture of air and powdered release agent is sucked in through the blowing nozzle 20, as shown by the corresponding arrows. Therefore, no substance can be deposited on the die plate 10, not even on the shaft of the upper punch 14. The distances mentioned and the nozzle openings as well as the air quantity and the air pressure or the quantity of the lubricant are matched to one another in such a way that only a minimal quantity the stressed surfaces of the pressing tools is applied and all excess material is removed via the suction nozzle 20. From there, it is taken to a suitable disposal together with the material dust from the tabletting machine.

Claims (7)

Verfahren zum Aufbringen von dosierten Mengen von pulverförmigem Schmier- oder Trennmittel auf die beanspruchten Flächen von Preßwerkzeugen in Tablettiermaschinen, bei dem das von einem gasförmigen Transportmedium gleichförmig verteilte Trennmittel auf die Flächen geblasen wird, dadurch gekennzeichnet, daß das Trennmittel während des Betriebs der Tablettiermaschine kontinuierlich auf die beanspruchten Flächen geblasen und überschüssiges Trennmittel von den beanspruchten Flächen benachbarten Bereichen kontinuierlich abgesaugt wird.Method for applying metered amounts of powdered lubricant or separating agent to the claimed surfaces of pressing tools in tableting machines, in which the separating agent uniformly distributed by a gaseous transport medium is blown onto the surfaces, characterized in that the separating agent is continuously on during operation of the tabletting machine the stressed areas are blown and excess release agent is continuously sucked away from the areas adjacent to the stressed areas. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß bei einer Doppelrundläufermaschine mit zwei am Umfang beabstandeten Füllvorrichtungen in Laufrichtung von der jeweils nicht benutzten Füllvorrichtung das Trennmittel zugeführt und vor der jeweils benutzten Füllvorrichtung nicht zugeführt wird.A method according to claim 1, characterized in that in a double rotary machine with two circumferentially spaced filling devices, the separating agent is supplied in the running direction from the respectively unused filling device and is not supplied before the respectively used filling device. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß oberhalb der Matrizenscheibe (10) in geringem Abstand zu dieser eine Blasdüse (16) angeordnet ist mit einer zur Umlaufbahn der Matrizenlöcher (12) ausgerichteten unteren Düsenöffnung (18) und einer zur Umlaufbahn der Oberstempel (14) ausgerichteten oberen Düsenöffnung (19).Device for carrying out the method according to claim 1 or 2, characterized in that a blowing nozzle (16) is arranged above the die plate (10) at a short distance therefrom, with a blowing orifice the die holes (12) aligned lower nozzle opening (18) and an upper nozzle opening (19) aligned with the orbit of the upper punches (14). Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Düsenöffnungen (19, 18) von radial angeordneten Schlitzen gebildet sind.Device according to claim 3, characterized in that the nozzle openings (19, 18) are formed by radially arranged slots. Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß der Blasdüse (16) benachbart eine Saugdüse (20) angeordnet ist mit oberer und unterer Saugöffnung (22, 24).Apparatus according to claim 3 or 4, characterized in that a suction nozzle (20) is arranged adjacent to the blowing nozzle (16) with upper and lower suction openings (22, 24). Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die untere Saugöffnung (24) einen geringeren Abstand zur Matrizenscheibe (10) hat als die untere Blasöffnung (18).Apparatus according to claim 5, characterized in that the lower suction opening (24) has a smaller distance from the die plate (10) than the lower blowing opening (18). Vorrichtung nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, daß die Blasdüse (16) in Laufrichtung vor der Saugdüse (20) angeordnet ist.Device according to one of claims 3 to 6, characterized in that the blowing nozzle (16) is arranged upstream of the suction nozzle (20).
EP95104525A 1994-04-08 1995-03-28 Device for applying powdered lubricant or release agent onto the pressing tools in tabletting machines Expired - Lifetime EP0676280B2 (en)

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DE4412117A DE4412117A1 (en) 1994-04-08 1994-04-08 Method and device for applying powdered lubricant or separating agent to the pressing tools in tabletting machines
DE4412117 1994-04-08

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EP0676280A1 true EP0676280A1 (en) 1995-10-11
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FR2790387A1 (en) * 1999-03-01 2000-09-08 Prographarm Laboratoires ORODISPERSIBLE TABLET WITH LOW FRIABILITY AND ITS PREPARATION PROCESS
AU755056B2 (en) * 1997-12-03 2002-12-05 Kyowa Hakko Kirin Co., Ltd. Process for the production of tablets and tablets
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EP0842763A3 (en) * 1996-11-14 1998-07-22 Bayer Ag Apparatus for the controlled spraying of a lubricating product in powder form on punches and dies in tablet presses
US6079968A (en) * 1996-11-14 2000-06-27 Bayer Aktiengesellschaft Device for the controlled spraying of pulverulent lubricants onto punches and dies of tableting presses
AU755056B2 (en) * 1997-12-03 2002-12-05 Kyowa Hakko Kirin Co., Ltd. Process for the production of tablets and tablets
AU755056C (en) * 1997-12-03 2003-10-30 Kyowa Hakko Kirin Co., Ltd. Process for the production of tablets and tablets
FR2790387A1 (en) * 1999-03-01 2000-09-08 Prographarm Laboratoires ORODISPERSIBLE TABLET WITH LOW FRIABILITY AND ITS PREPARATION PROCESS
WO2000051568A1 (en) * 1999-03-01 2000-09-08 Ethypharm Orally dispersible tablet with low friability and method for preparing same
US8377472B1 (en) 1999-03-01 2013-02-19 Ethypharm Orally dispersible tablet with low friability and method for preparing same
US10967597B2 (en) 2016-12-01 2021-04-06 Fette Compacting Gmbh Method and system for feeding a lubricating or releasing agent to pressing tools of a tablet press

Also Published As

Publication number Publication date
AU2184395A (en) 1995-12-21
KR950035519A (en) 1995-12-30
DE4412117A1 (en) 1995-10-12
DE59504299D1 (en) 1999-01-07
EP0676280B1 (en) 1998-11-25
AU689572B2 (en) 1998-04-02
US5643630A (en) 1997-07-01
EP0676280B2 (en) 2003-11-12

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