EP0572816B1 - Process and apparatus for making double-layered tablets on a two station rotary press - Google Patents

Process and apparatus for making double-layered tablets on a two station rotary press Download PDF

Info

Publication number
EP0572816B1
EP0572816B1 EP93107324A EP93107324A EP0572816B1 EP 0572816 B1 EP0572816 B1 EP 0572816B1 EP 93107324 A EP93107324 A EP 93107324A EP 93107324 A EP93107324 A EP 93107324A EP 0572816 B1 EP0572816 B1 EP 0572816B1
Authority
EP
European Patent Office
Prior art keywords
station
layer
discharge
die
pressing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93107324A
Other languages
German (de)
French (fr)
Other versions
EP0572816A1 (en
Inventor
Jürgen Ing. Grad. Hinzpeter
Ingo Schmidt
Helmut Brommrowitz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fette GmbH
Original Assignee
Wilhelm Fette GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Wilhelm Fette GmbH filed Critical Wilhelm Fette GmbH
Publication of EP0572816A1 publication Critical patent/EP0572816A1/en
Application granted granted Critical
Publication of EP0572816B1 publication Critical patent/EP0572816B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B30PRESSES
    • B30BPRESSES IN GENERAL
    • B30B11/00Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/005Control arrangements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B30PRESSES
    • B30BPRESSES IN GENERAL
    • B30B11/00Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B30B11/08Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with moulds carried by a turntable
    • B30B11/085Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with moulds carried by a turntable for multi-layer articles

Definitions

  • the invention relates to a method for pressing two-layer tablets in a double rotary press according to the preamble of claim 1.
  • Rotary presses for the production of tablets from a wide variety of substances and for a wide variety of applications are generally known.
  • a die plate which is usually driven about a vertical axis, has dies arranged on a circle, to which pairs of press rams that are synchronous with the plate are assigned.
  • the press rams are actuated by control cams and pressure rollers.
  • the lower punch of a pair forms the bottom of a mold cavity, its height in the die dictating the dosage. This is followed by pressing opposing rams in a pressing station towards one another and compressing the tablet material to a desired thickness (web height).
  • the press station usually has a pre-printing and a main printing station.
  • the lower punches controlled by the ejector curve, push the tablet out of the die at a certain point on the machine, while the opposite row of punches (upper punch) gradually moves away from the die plate.
  • a stripper can strip the ejected compacts from the die plate and feed them to a discharge channel.
  • a discharge switch can be assigned to the discharge channel, which optionally directs the incoming tablets towards a test station.
  • a device of this type has become known from GB-A-952006.
  • the first layers are compressed more in the intermediate sampling station before the sampling than during normal production. It is assumed that during the manufacture of the two-layer tablet the first layer can only be "pressed” and must not yet have the hardness of the final tablet. Otherwise, the two layers could not be joined by press molding.
  • the final thickness or web height of the two-layer tablet is reached in the second pressing station, in which the tablet is given the desired tightness or hardness. If the first layer is removed in its normal state, it is relatively soft, so that material is rubbed off or crumbled off, particularly in the case of automatic removal. Therefore, in the method according to the invention, the first layer is compressed noticeably more than during normal production, so that the first layer has a consistency comparable to the usual tablet and can be treated accordingly. It is therefore readily possible to automatically remove the compressed first layer in the same way as is known and customary for finished tablets in rotary presses of the type mentioned, so that they can be fed to an automatic test method.
  • the invention has for its object to provide a method for pressing two-layer tablets in a double rotary press, in which it is prevented that residues remain in the die holes after ejection and detachable or rubbed material accumulates on the die plate and in the rest of the machine when the second layer is also filled during sampling.
  • the second layers are also still filled in, ie the second filling device remains in operation even during the sampling. It is only necessary to ensure that the compacts representing the second layer are led into a bad channel, from where they can be returned to the starting material by suitable recycling measures.
  • the invention therefore provides that the second layers are also increasingly compressed during the sampling.
  • the method has the advantage that it enables a sample to be taken fully automatically within a short time, for example within 10 seconds, with extremely little uncompressed material being able to collect on the die plate, on the tablet scraper or in the tablet outlet.
  • the previous effort to operate the filling device in front of the second press station is no longer applicable.
  • an intermediate removal station is required, in which the compacts consisting of only one layer can be removed and fed to a testing device.
  • a device provides that the intermediate removal station has an adjustable ejector curve segment, a stripping device and a discharge switch and that the discharge switch directs incoming single-layer compacts either into a bad channel or to the test station.
  • the discharge switch is directed towards the bad channel as long as the curve segment in the press station and the curve segment for the ejector have not reached the new position for sampling.
  • the control curves of the first and, if necessary, the second press station are adjusted synchronously. This produces some two-layer compacts with increased compression. These will also be led into the bad channel through a discharge switch in the removal station.
  • An impermissible pressure load on the machine can be avoided by means of pressure limitation measures that are generally known in connection with tabletting machines or by adjusting the compression parameters (web heights).
  • the curve segment for the first ejector station is expediently operated by an electromechanical drive adjusted, for example a spindle drive or the like.
  • a rotary press 10 for the production of two-layer tablets is indicated in FIG. 1.
  • the supply of tablet material is not shown.
  • the finished two-layer tablets reach an automatic dedusting and deburring device 14 via a conveyor path 12.
  • the finished tablets pass from the device 14 a conveyor path 16 to a filling device 18.
  • the rotary press 10 is assigned an automatic test device 20, which in particular checks the weight of the tablets.
  • a branch 22, which leads to the testing device 20, is branched off from the conveying path 16. From time to time, tablets are branched off and subjected to an automatic check.
  • a further conveyor path 24 shown in dashed lines can be seen in FIG. 1. This is intended to indicate that the first layer of a two-layer tablet is also removed from the press 10 and fed to the testing device 20.
  • a conveyor path 26 is indicated by dashed lines. The second layer of a two-layer tablet is to be fed to the testing device 20 via it.
  • the operation of the devices shown is controlled by an operating computer 28 via a control cabinet 30.
  • FIG. 2 The basic structure of the rotary press 10 according to FIG. 1 is shown in FIG. 2.
  • Tablet material for the first layer is fed to a first filling station 32, in which the material is dispensed in a metered manner into die bores in a die plate.
  • the first layer is compressed in a pre-compression station 34 and in one second compression station 36 fully compresses the first layer.
  • the main printing station 36 is followed by an ejection station 38, which is however out of operation when producing a two-layer tablet.
  • the material for the second layer is metered in a second filling station 42, and a second pre-pressing station 44 compresses the two layers in a first process, while a second pre-pressing station 46 the final one Compression concerned.
  • a second ejection station 48 the finished two-layer compacts are removed from the rotating die plate and removed in a removal station 50, from where they are then fed to the dedusting and deburring device 14, as described with reference to FIG. 1.
  • the discharge stations 40 and 50 are assigned discharge switches which can be pivoted between two positions.
  • the discharge switch assigned to the intermediate removal station 40 directs the single-layer compacts either to a bad channel, not shown, or to the testing device 20.
  • the discharge switch 50 of the removal station 50 either directs the compacts to the device 14 or also into a bad channel.
  • a die plate 52 which is driven to rotate about a vertical axis, has a row of continuous die holes 54 arranged on a circle.
  • a pair of press rams 56, 54 is assigned to each die hole 54.
  • the upper ram 56 are axially movable in a disk 58 which is driven synchronously with the die plate 52.
  • the lower press rams 54 are axially movably mounted in a disk 60, which also rotates synchronously.
  • the axial position of the rams 53 and 56 is determined by control cams with which the rear ends of the rams 53, 56 cooperate.
  • the first filling station 32 contains a filling device 62 (not described in more detail), which is arranged above the disk 52 and fills tablet material, for example in powder form, into the passing die holes 54.
  • the filling depth is determined by the position of the lower press rams 53, which first run along a fixed cam segment 66 to form a movable cam segment 68, which can be actuated with the aid of an electromechanical adjusting device 70 (not described in more detail).
  • the cam segment 68 delimits the end position of the lower press rams 53, which gradually release the die holes 54 along the cam segment 66. By adjusting the curve segment 68 can therefore the filling depth and thus the dosage can be determined.
  • the actual pre-pressing device 34 is formed by pre-pressure rollers 70, 72 which specify the extent to which the filling in the die holes 54 is pressed together.
  • the height of the compact obtained in this way is also referred to as the web height.
  • the final web height is also determined in the main press station 36 by adjustable main pressure rollers 74, 76.
  • FIG. 3 shows the state of sampling for the first layer of a two-layer tablet.
  • a second layer is filled into the matrix holes on the first layer in a similar manner as described above and pressed together in the same way as was explained for the first layer.
  • a curve segment 78 is adjusted by means of an electromechanical adjusting device 80 so that the lower ram 53 are moved upwards, while the upper ram 56 with the help curve segment 80a can also move upwards.
  • the single-layer compacts 82 are ejected up to the surface of the die plate 52 and can be deflected to the side with the aid of a scraper 84 in the direction of the intermediate removal station 40.
  • a similar ejection station is provided in the removal station 50.
  • the operation of a rotary press for producing a two-layer tablet is known. It should therefore not be explained further.
  • the sampling for the first layer is explained below with reference to FIG. 4.
  • the start for the start of sampling is indicated in FIG. 4.
  • the pressing stations 34, 36 and 44, 46 are set with the help of the pressure rollers so that the desired web heights for the first layer and the double layer are achieved.
  • the switch in the intermediate removal station is in a position in which it forwards compacts to the testing device 20.
  • the switch of the intermediate removal station is also inoperative.
  • the switch in the removal station 50 is switched so that it deflects the two-layer compacts towards the dedusting and deburring device 14.
  • the web heights in the first and the second press stations 40, 50 are brought to a lower value in a temporal connection, which is done by correspondingly adjusting the pressure rollers in the press stations.
  • the switches of the intermediate and main removal station are switched towards the bad channel.
  • the adjusting device 80 begins to adjust the curve segment 78 in the ejection station 38 into a position as shown in FIG. 3.
  • the switch in the intermediate removal station is switched over so that the ejected single-layer compacts can reach the testing device 20 via the transport path 24.
  • the switch in the intermediate sampling station is switched back towards the bad channel.
  • the curve segment 78 is moved back again, so that the removal of single-layer compacts is ended.
  • the ejection station 36 has reached its original position again, the web heights are brought back to the original value by adjustment in the pressing stations.
  • the drain switch in the main removal station which, as mentioned, was previously switched continuously towards the bad channel, becomes again switched so that the two-layer compacts can again reach the device 14 via the normal transport route 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Medical Preparation Storing Or Oral Administration Devices (AREA)
  • Sorting Of Articles (AREA)

Description

Die Erfindung bezieht sich auf ein verfahren zum pressen von Zweischichttabletten in einer Doppelrundläuferpresse nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for pressing two-layer tablets in a double rotary press according to the preamble of claim 1.

Rundlaufpressen zur Herstellung von Tabletten aus den verschiedensten Stoffen und für die verschiedensten Anwendungszwecke sind allgemein bekannt. Eine zumeist um eine vertikale Achse angetriebene Matrizenscheibe weist auf einem Kreis angeordnete Matrizen auf, denen synchron mit der Scheibe umlaufende preßstempelpaare zugeordnet sind. Die Betätigung der Preßstempel erfolgt durch Steuerkurven und Druckrollen.Rotary presses for the production of tablets from a wide variety of substances and for a wide variety of applications are generally known. A die plate, which is usually driven about a vertical axis, has dies arranged on a circle, to which pairs of press rams that are synchronous with the plate are assigned. The press rams are actuated by control cams and pressure rollers.

Während der Befüllung der Matrizenbohrungen mittels einer geeigneten Füllvorrichtung bildet der Unterstempel eines Paares den Boden eines Formnestes, wobei seine Höhe in der Matrize die Dosierung vorgibt. Anschließend erfolgt durch Aufeinanderzubewegen gegenüberliegender Preßstempel in einer Preßstation das Verpressen des Tablettenmaterials auf eine gewünschte Dicke (Steghöhe). Die Preßstation weist in der Regel eine Vordruck- und eine Hauptdruckstation auf. Im Anschluß an das Verdichten schieben die Unterstempel, gesteuert durch die Auswerferkurve, an einer bestimmten Stelle der Maschine die Tablette aus der Matrize heraus, während sich die gegenüberliegende Stempelreihe (Oberstempel) allmählich von der Matrizenscheibe entfernt. Dadurch kann ein Abstreifer die ausgeworfenen Preßlinge von der Matrizenscheibe abstreifen und einem Ablaufkanal zuführen.During the filling of the die holes by means of a suitable filling device, the lower punch of a pair forms the bottom of a mold cavity, its height in the die dictating the dosage. This is followed by pressing opposing rams in a pressing station towards one another and compressing the tablet material to a desired thickness (web height). The press station usually has a pre-printing and a main printing station. Following compaction, the lower punches, controlled by the ejector curve, push the tablet out of the die at a certain point on the machine, while the opposite row of punches (upper punch) gradually moves away from the die plate. As a result, a stripper can strip the ejected compacts from the die plate and feed them to a discharge channel.

Es besteht die Notwendigkeit, u.a. das Gewicht der hergestellten Tabletten zu prüfen und ggf. eine Korrektur vorzunehmen. Daher kann dem Ablaufkanal eine Ablaufweiche zugeordnet werden, welche die ankommenden Tabletten wahlweise in Richtung einer Prüfstation lenkt. Eine Vorrichtüng dieser Art ist aüs der GB-A-952006 bekannt geworden.It is necessary, among other things, to check the weight of the tablets produced and, if necessary, to make a correction. Therefore, a discharge switch can be assigned to the discharge channel, which optionally directs the incoming tablets towards a test station. A device of this type has become known from GB-A-952006.

Aüs der genannten Drückschrift ist ferner bekannt, Tabletten, die aus zwei Schichten bestehen, ebenfalls mit einer Rundlaufpresse der genannten Art herzüstellen werden, in der die beschriebenen Stationen doppelt vorgesehen sind. Zunächst wird eine erste Schicht eingefüllt und leicht verdichtet. Sodann wird die zweite Schicht darüber eingefüllt; danach erfolgt die Verpressung zur Zweischichttablette mit anschließender Entnahme, wie oben beschrieben. Weicht bei einer Überprüfung das Gewicht der Zweischichttablette vom Sollgewicht ab, ist nicht erkennbar, ob die erste, die zweite oder beide Schichten fehlerhaft sind. Es ergibt sich mithin die Notwendigkeit, auch das Gewicht der ersten Schicht zu prüfen. Das hierfür angewendete Verfahren wurde bisher manuell durchgeführt. Die ersten Schichten wurden manuell entnommen, und die der zweiten Preßstation vorgeordnete Fülleinrichtung wurde außer Funktion gesetzt und durch hydraulische Betätigung von der Matrizenscheibe entfernt.Furthermore, it is known from the aforementioned printed publication that tablets consisting of two layers will also be produced with a rotary press of the type mentioned, in which the stations described are provided twice. First, a first layer is filled in and slightly compressed. The second layer is then filled in; afterwards, the two-layer tablet is compressed and then removed, as described above. If the weight of the two-layer tablet deviates from the target weight during a check, it cannot be seen whether the first, the second or both layers are faulty. There is therefore a need to also check the weight of the first layer. The procedure used for this was previously carried out manually. The first layers were removed manually, and the filling device upstream of the second pressing station was deactivated and removed from the die plate by hydraulic actuation.

Bei dem bekannten Verfahren werden vor der Probenentnahme in der Zwischenentnahmestation die ersten Schichten stärker komprimiert als während der normalen Fertigung. Man geht von der Erkenntnis aus, daß während der Fertigung der Zweischichttablette die erste Schicht lediglich "angepreßt" werden kann und noch nicht die Härte der endgültigen Tablette aufweisen darf. Andernfalls wäre das Verbinden der beiden Schichten durch Preßformung nicht zu bewerkstelligen. Die endgültige Dicke bzw. Steghöhe der Zweischichttablette wird in der zweiten Preßstation erreicht, in der der Tablette die gewünschte Dichtigkeit bzw. Härte verliehen wird. Wird die erste Schicht in ihrem normalen Zustand entnommen, ist sie relativ weich, so daß es insbesondere bei automatischer Entnahme zum Abreiben oder Abbröckeln von Material kommt. Daher wird beim erfindungsgemäßen Verfahren vor dem Probenziehen die erste Schicht merklich stärker komprimiert als während der normalen Fertigung, so daß die erste Schicht eine der üblichen Tablette vergleichbare Konsistenz hat und entsprechend behandelt werden kann. Es ist daher ohne weiteres möglich, die verpreßte erste Schicht automatisch zu entnehmen in der gleichen Weise, wie dies für fertige Tabletten bei Rundlaufpressen der genannten Art bekannt und üblich ist, damit sie einem automatischen Prüfverfahren zugeführt werden kann.In the known method, the first layers are compressed more in the intermediate sampling station before the sampling than during normal production. It is assumed that during the manufacture of the two-layer tablet the first layer can only be "pressed" and must not yet have the hardness of the final tablet. Otherwise, the two layers could not be joined by press molding. The final thickness or web height of the two-layer tablet is reached in the second pressing station, in which the tablet is given the desired tightness or hardness. If the first layer is removed in its normal state, it is relatively soft, so that material is rubbed off or crumbled off, particularly in the case of automatic removal. Therefore, in the method according to the invention, the first layer is compressed noticeably more than during normal production, so that the first layer has a consistency comparable to the usual tablet and can be treated accordingly. It is therefore readily possible to automatically remove the compressed first layer in the same way as is known and customary for finished tablets in rotary presses of the type mentioned, so that they can be fed to an automatic test method.

Aus der US-A-2,906,214 ist bekannt geworden, bei Entnahme der ersten Schicht einer Zweischichttablette zu Prüfzwecken die zweite Schicht ebenfalls zu pressen, sie jedoch durch eine Ablaufvorrichtung in Form einer Luftdüse in einen Schlechtkanal abzuführen.From US-A-2,906,214 it has become known that when the first layer of a two-layer tablet is removed for testing purposes, the second layer is also pressed, but is discharged into a bad channel through a drain device in the form of an air nozzle.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Pressen von Zweischichttabletten in einer Doppelrundläuferpresse anzugeben, bei dem verhindert wird, daß nach dem Auswerfen Reste in den Matrizenlöchern verbleiben und sich ablösendes oder abgeriebenes Material auf der Matrizenscheibe und im übrigen Bereich der Maschine ansammelt, wenn auch die zweite Schicht während des Probenziehens eingefüllt wird.The invention has for its object to provide a method for pressing two-layer tablets in a double rotary press, in which it is prevented that residues remain in the die holes after ejection and detachable or rubbed material accumulates on the die plate and in the rest of the machine when the second layer is also filled during sampling.

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

Beim erfindungsgemäßen Verfahren werden ebenfalls die zweiten Schichten nach wie vor eingefüllt, d.h. die zweite Fülleinrichtung bleibt auch während des Probenziehens in Betrieb. Es muß lediglich dafür gesorgt werden, daß die die zweite Schicht repräsentierenden Preßlinge in einen Schlechtkanal geleitet werden, von wo sie durch geeignete Recyclingmaßnahmen wieder dem Ausgangsmaterial zugeführt werden können.In the method according to the invention, the second layers are also still filled in, ie the second filling device remains in operation even during the sampling. It is only necessary to ensure that the compacts representing the second layer are led into a bad channel, from where they can be returned to the starting material by suitable recycling measures.

Da die erste Schicht entnommen ist, kommt es zu einer verminderten Komprimierung der zweiten Schicht in der zweiten Preßstation, so daß die Gefahr besteht, daß nach dem Auswerfen Reste in den Matrizenlöchern verbleiben oder sich ablösendes oder abgeriebenes Material auf der Matrizenscheibe oder im übrigen Bereich der Maschine ansammelt. Daher sieht die Erfindung vor, daß während der Probenentnahme die zweiten Schichten ebenfalls verstärkt komprimiert werden.Since the first layer is removed, there is a reduced compression of the second layer in the second pressing station, so that there is a risk that after ejection, residues remain in the die holes or detachable or abraded material on the die plate or in the rest of the area Machine accumulates. The invention therefore provides that the second layers are also increasingly compressed during the sampling.

Das erfindungsgemäße Verfahren hat den Vorteil, daß es innerhalb rascher Zeit, zum Beispiel innerhalb von 10 Sekunden, vollautomatisch einen Probenzug ermöglicht, wobei sich äußerst wenig unverpreßtes Material auf der Matrizenscheibe, am Tablettenabstreifer oder im Tablettenauslauf ansammeln kann. Der bisherige Aufwand zur Betätigung der Fülleinrichtung vor der zweiten Preßstation kommt in Fortfall.The method has the advantage that it enables a sample to be taken fully automatically within a short time, for example within 10 seconds, with extremely little uncompressed material being able to collect on the die plate, on the tablet scraper or in the tablet outlet. The previous effort to operate the filling device in front of the second press station is no longer applicable.

Zur Durchführung des erfindungsgemäßen Verfahrens ist eine Zwischenentnahmestation erforderlich, in welcher die nur aus einer Schicht bestehenden Preßlinge entnommen und einer Prüfvorrichtung zugeführt werden können.To carry out the method according to the invention, an intermediate removal station is required, in which the compacts consisting of only one layer can be removed and fed to a testing device.

In diesem Zusammenhang sieht eine erfindungsgemäße Vorrichtung vor, daß die Zwischenentnahmestation ein verstellbares Auswerfer-Kurvensegment, eine Abstreifvorrichtung und eine Ablaufweiche aufweist und die Ablaufweiche ankommende einschichtige Preßlinge wahlweise in einen Schlechtkanal oder zur Prüfstation lenkt. Die Ablaufweiche ist so lange in Richtung Schlechtkanal gerichtet, solange nicht das Kurvensegment in der Preßstation und das Kurvensegment für den Auswerfer die neue Position für die Probenentnahme erreicht haben.In this context, a device according to the invention provides that the intermediate removal station has an adjustable ejector curve segment, a stripping device and a discharge switch and that the discharge switch directs incoming single-layer compacts either into a bad channel or to the test station. The discharge switch is directed towards the bad channel as long as the curve segment in the press station and the curve segment for the ejector have not reached the new position for sampling.

Die Steuerkurven von erster und bei Bedarf zweiter Preßstation werden synchron verstellt. Dadurch werden einige Zweischichtpreßlinge mit erhöhter Kompression hergestellt. Diese werden durch eine Ablaufweiche in der Entnahmestation ebenfalls in den Schlechtkanal geleitet werden. Eine unzulässige Druckbelastung der Maschine kann durch Druckbegrenzungsmaßnahmen vermieden werden, die in Verbindung mit Tablettiermaschinen generell bekannt sind bzw. durch Anpassung der Komprimierungsparameter (Steghöhen).The control curves of the first and, if necessary, the second press station are adjusted synchronously. This produces some two-layer compacts with increased compression. These will also be led into the bad channel through a discharge switch in the removal station. An impermissible pressure load on the machine can be avoided by means of pressure limitation measures that are generally known in connection with tabletting machines or by adjusting the compression parameters (web heights).

Das Kurvensegment für die erste Auswerferstation wird zweckmäßigerweise von einem elektromechanischen Antrieb verstellt, beispielsweise einem Spindeltrieb oder dergleichen.The curve segment for the first ejector station is expediently operated by an electromechanical drive adjusted, for example a spindle drive or the like.

Die Erfindung wird nachfolgend anhand von Zeichungen näher erläutert.

Fig. 1
zeigt schematisch den Aufbau einer Vorrichtung zur Herstellung einer Zweischichttablette.
Fig. 2
zeigt in Draufsicht schematisch eine Rundlaufpresse zur Durchführung des Verfahrens nach der Erfindung.
Fig. 3
zeigt in Seitenansicht die Rundlaufpresse nach Fig. 2 im Bereich der Herstellung der ersten Schicht.
Fig. 4
zeigt ein Zeitdiagramm der Funktion der einzelnen Stationen der Rundlaufpresse während der Probenentnahme der ersten Schicht.
The invention is explained in more detail below with reference to drawings.
Fig. 1
shows schematically the structure of a device for producing a two-layer tablet.
Fig. 2
shows a top view schematically a rotary press for performing the method according to the invention.
Fig. 3
shows the side view of the rotary press according to FIG. 2 in the area of the production of the first layer.
Fig. 4
shows a time diagram of the function of the individual stations of the rotary press during the sampling of the first layer.

In Fig. 1 ist eine Rundlaufpresse 10 zur Herstellung von Zweischichttabletten angedeutet. Die Zufuhr von Tablettenmaterial ist nicht gezeigt. Die fertigen Zweischichttabletten gelangen über einen Förderweg 12 zu einer automatischen Entstaubungs- und Entgratungsvorrichtung 14. Von der Vorrichtung 14 gelangen die fertigen Tabletten über einen Förderweg 16 zu einer Abfüllvorrichtung 18.A rotary press 10 for the production of two-layer tablets is indicated in FIG. 1. The supply of tablet material is not shown. The finished two-layer tablets reach an automatic dedusting and deburring device 14 via a conveyor path 12. The finished tablets pass from the device 14 a conveyor path 16 to a filling device 18.

Der Rundlaufpresse 10 ist eine automatische Prüfvorrichtung 20 zugeordnet, die insbesondere das Gewicht der Tabletten prüft. Von dem Förderweg 16 ist eine Abzweigung 22 abgezweigt, die zur Prüfvorrichtung 20 führt. Von Zeit zu Zeit werden mithin Tabletten abgezweigt und einer automatischen Prüfung unterzogen. In Fig. 1 ist ein weiterer gestrichelt gezeichneter Förderweg 24 zu erkennen. Dadurch soll angedeutet werden, daß aus der Presse 10 auch die erste Schicht einer Zweischichttablette entnommen und der Prüfvorrichtung 20 zugeführt wird. Schließlich ist gestrichelt ein Förderweg 26 angedeutet. Über ihn soll die zweite Schicht einer Zweischichttablette der Prüfvorrichtung 20 zugeführt werden.The rotary press 10 is assigned an automatic test device 20, which in particular checks the weight of the tablets. A branch 22, which leads to the testing device 20, is branched off from the conveying path 16. From time to time, tablets are branched off and subjected to an automatic check. A further conveyor path 24 shown in dashed lines can be seen in FIG. 1. This is intended to indicate that the first layer of a two-layer tablet is also removed from the press 10 and fed to the testing device 20. Finally, a conveyor path 26 is indicated by dashed lines. The second layer of a two-layer tablet is to be fed to the testing device 20 via it.

Der Betrieb der gezeigten Vorrichtungen wird gesteuert durch einen Bedienrechner 28 über einen Schaltschrank 30.The operation of the devices shown is controlled by an operating computer 28 via a control cabinet 30.

Der prinzipielle Aufbau der Rundlaufpresse 10 nach Fig. 1 geht aus Fig. 2 hervor. Tablettenmaterial für die erste Schicht wird einer ersten Füllstation 32 zugeführt, in der das Material dosiert in Matrizenbohrungen einer Matrizenscheibe abgegeben wird.In einer Vorpreßstation 34 erfolgt eine erste Komprimierung der ersten Schicht und in einer zweiten Preßstation 36 die vollständige Komprimierung der ersten Schicht. An die Hauptdruckstation 36 schließt sich eine Auswerfstation 38 an, die jedoch bei der Herstellung einer Zweischichttablette außer Betrieb ist. Das gleiche gilt für eine Zwischenentnahmestation 40 in Herstellungsrichtung hinter der Auswerfstation 38. Das Material für die zweite Schicht wird in einer zweiten Füllstation 42 dosiert zugeführt, und eine zweite Vorpreßstation 44 verdichtet die beiden Schichten in einem ersten Verfahrensgang, während eine zweite Vorpreßstation 46 die endgültige Komprimierung besorgt. In einer zweiten Auswerfstation 48 werden die fertigen Zweischichtpreßlinge aus der umlaufenden Matrizenscheibe entfernt und in einer Entnahmestation 50 entnommen, von wo sie dann, wie anhand von Fig. 1 beschrieben, der Entstaubungs- und Entgratungsvorrichtung 14 zugeführt werden.The basic structure of the rotary press 10 according to FIG. 1 is shown in FIG. 2. Tablet material for the first layer is fed to a first filling station 32, in which the material is dispensed in a metered manner into die bores in a die plate. The first layer is compressed in a pre-compression station 34 and in one second compression station 36 fully compresses the first layer. The main printing station 36 is followed by an ejection station 38, which is however out of operation when producing a two-layer tablet. The same applies to an intermediate removal station 40 in the production direction behind the ejection station 38. The material for the second layer is metered in a second filling station 42, and a second pre-pressing station 44 compresses the two layers in a first process, while a second pre-pressing station 46 the final one Compression worried. In a second ejection station 48, the finished two-layer compacts are removed from the rotating die plate and removed in a removal station 50, from where they are then fed to the dedusting and deburring device 14, as described with reference to FIG. 1.

Den Entnahmestationen 40 und 50 sind Ablaufweichen zugeordnet, die zwischen zwei Positionen verschwenkbar sind. Die der Zwischenentnahmestation 40 zugeordnete Ablaufweiche lenkt die einschichtigen Preßlinge entweder zu einem nicht gezeigten Schlechtkanal oder zur Prüfvorrichtung 20. Die Ablaufweiche der Entnahmestation 50 lenkt die Preßlinge entweder zur Vorrichtung 14 oder ebenfalls in einen Schlechtkanal.The discharge stations 40 and 50 are assigned discharge switches which can be pivoted between two positions. The discharge switch assigned to the intermediate removal station 40 directs the single-layer compacts either to a bad channel, not shown, or to the testing device 20. The discharge switch 50 of the removal station 50 either directs the compacts to the device 14 or also into a bad channel.

Der Aufbau einer Rundlaufpresse geht aus Fig. 3 deutlicher hervor. Eine Matrizenscheibe 52, die um eine vertikale Achse drehend angetrieben ist, weist auf einem Kreis angeordnet eine Reihe von durchgehenden Matrizenlöchern 54 auf. Jedem Matrizenloch 54 ist ein Paar von Preßstempeln 56, 54 zugeordnet. Die oberen Preßstempel 56 sind axialbeweglich in einer Scheibe 58 gelagert, die synchron mit der Matrizenscheibe 52 angetrieben ist. Entsprechend sind die unteren Preßstempel 54 in einer Scheibe 60 axialbeweglich gelagert, die ebenfalls synchron umläuft. Die axiale Position der Preßstempel 53 und 56 wird bestimmt durch Steuerkurven, mit denen die hinteren Enden der Preßstempel 53, 56 zusammenwirken. Die erste Füllstation 32 enthält eine nicht näher beschriebene Füllvorrichtung 62, die oberhalb der Scheibe 52 angeordnet ist und Tablettenmaterial in zum Beispiel Pulverform in die vorbeilaufenden Matrizenlöcher 54 einfüllt. Die Einfülltiefe wird bestimmt durch die Position der unteren Preßstempel 53, die zunächst an einem feststehenden Kurvensegment 66 entlanglaufen zu einem beweglichen Kurvensegment 68, das mit Hilfe einer nicht näher beschriebenen elektromechanischen Verstellvorrichtung 70 betätigbar ist. Das Kurvensegment 68 begrenzt die Endlage der unteren Preßstempel 53, die entlang des Kurvensegments 66 allmählich die Matrizenlöcher 54 freigeben. Durch Verstellung des Kurvensegments 68 kann mithin die Einfülltiefe und damit die Dosierung bestimmt werden. Eine sich an die Füllvorrichtung 62 anschließende, auf der Scheibe 52 aufliegenden Platte 66a verhindert ein Herausquellen des Materials aus den Löchern 54 bis mit Hilfe eines oberen Kurvensegments 68a der Vorpreßstation 34 auch die oberen Preßstempel 56 mit den Matrizenlöchern 54 zusammenwirken. Die eigentliche Vorpreßeinrichtung 34 wird von Vordruckrollen 70, 72 gebildet, welche das Maß vorgeben, um das die Füllung in den Matrizenlöchern 54 zusammengepreßt wird. Man bezeichnet die Höhe des auf diese Weise erhaltenen Preßlings auch als Steghöhe. Die endgültige Steghöhe wird in der Hauptpreßstation 36 ebenfalls durch verstellbare Hauptdruckrollen 74, 76 bestimmt.The construction of a rotary press is shown more clearly in FIG. 3. A die plate 52, which is driven to rotate about a vertical axis, has a row of continuous die holes 54 arranged on a circle. A pair of press rams 56, 54 is assigned to each die hole 54. The upper ram 56 are axially movable in a disk 58 which is driven synchronously with the die plate 52. Accordingly, the lower press rams 54 are axially movably mounted in a disk 60, which also rotates synchronously. The axial position of the rams 53 and 56 is determined by control cams with which the rear ends of the rams 53, 56 cooperate. The first filling station 32 contains a filling device 62 (not described in more detail), which is arranged above the disk 52 and fills tablet material, for example in powder form, into the passing die holes 54. The filling depth is determined by the position of the lower press rams 53, which first run along a fixed cam segment 66 to form a movable cam segment 68, which can be actuated with the aid of an electromechanical adjusting device 70 (not described in more detail). The cam segment 68 delimits the end position of the lower press rams 53, which gradually release the die holes 54 along the cam segment 66. By adjusting the curve segment 68 can therefore the filling depth and thus the dosage can be determined. A plate 66a adjoining the filling device 62 and resting on the disk 52 prevents the material from escaping from the holes 54 until, with the aid of an upper curve segment 68a of the pre-pressing station 34, the upper press rams 56 also cooperate with the die holes 54. The actual pre-pressing device 34 is formed by pre-pressure rollers 70, 72 which specify the extent to which the filling in the die holes 54 is pressed together. The height of the compact obtained in this way is also referred to as the web height. The final web height is also determined in the main press station 36 by adjustable main pressure rollers 74, 76.

In Fig. 3 ist der probenentnahmezustand für die erste Schicht einer Zweischichttablette angedeutet. Während des normalen Betriebes zur Herstellung einer Zweischichttablette wird in ähnlicher Weise, wie oben beschrieben, eine zweite Schicht in die Matrizenlöcher auf die erste Schicht eingefüllt und in gleicher Weise zusammengepreßt wie dies für die erste Schicht erläutert wurde. In Fig. 3 ist indessen dargestellt, wie ein Kurvensegment 78 mit Hilfe einer elektromechanischen Verstellvorrichtung 80 so verstellt ist, daß die unteren Preßstempel 53 nach oben bewegt werden, während die oberen Preßstempel 56 mit Hilfe des Kurvensegments 80a sich ebenfalls nach oben entfernen können. Dadurch werden die Einschichtpreßlinge 82 bis zur Oberfläche der Matrizenscheibe 52 ausgeworfen und können mit Hilfe eines Abstreifers 84 zur Seite abgelenkt werden in Richtung Zwischenentnahmestation 40. Eine ähnliche Auswerfstation ist in der Entnahmestation 50 vorgesehen. Der Betrieb einer Rundlaufpresse zur Herstellung einer Zweischichttablette ist bekannt. Er soll daher nicht weiter erläutert werden. Nachfolgend wird das Probenziehen für die erste Schicht anhand von Fig. 4 erläutert.3 shows the state of sampling for the first layer of a two-layer tablet. During normal operation for the production of a two-layer tablet, a second layer is filled into the matrix holes on the first layer in a similar manner as described above and pressed together in the same way as was explained for the first layer. In Fig. 3 it is shown how a curve segment 78 is adjusted by means of an electromechanical adjusting device 80 so that the lower ram 53 are moved upwards, while the upper ram 56 with the help curve segment 80a can also move upwards. As a result, the single-layer compacts 82 are ejected up to the surface of the die plate 52 and can be deflected to the side with the aid of a scraper 84 in the direction of the intermediate removal station 40. A similar ejection station is provided in the removal station 50. The operation of a rotary press for producing a two-layer tablet is known. It should therefore not be explained further. The sampling for the first layer is explained below with reference to FIG. 4.

In Fig. 4 ist der Start für den Beginn des Probenziehens angedeutet. Vor dem Start sind die Preßstationen 34, 36 bzw. 44, 46 mit Hilfe der Druckrollen so eingestellt, daß die gewünschten Steghöhen für die erste Schicht und die Doppelschicht erreicht werden. Die Weiche in der Zwischenentnahmestation befindet sich in einer Position, in der sie Preßlinge zum Prüfgerät 20 weiterleitet. Da jedoch der Auswerfer in der Auswerfstation 38 inaktiv ist, d.h. die erste Schicht nicht auswirft, ist die Weiche der Zwischenentnahmestation ebenfalls funktionslos. Die Weiche in der Entnahmestation 50 ist so geschaltet, daß sie die Zweischichtpreßlinge in Richtung Entstaubungs- und Entgratungsvorrichtung 14 ablenkt.The start for the start of sampling is indicated in FIG. 4. Before starting, the pressing stations 34, 36 and 44, 46 are set with the help of the pressure rollers so that the desired web heights for the first layer and the double layer are achieved. The switch in the intermediate removal station is in a position in which it forwards compacts to the testing device 20. However, since the ejector in the ejection station 38 is inactive, ie does not eject the first layer, the switch of the intermediate removal station is also inoperative. The switch in the removal station 50 is switched so that it deflects the two-layer compacts towards the dedusting and deburring device 14.

Zu Beginn des Probenziehens werden die Steghöhen in den ersten und den zweiten Preßstationen 40, 50 in zeitlichem Zusammenhang auf einen geringeren Wert gebracht, was durch entsprechende Verstellung der Druckrollen in den Preßstationen erfolgt. Gleichzeitig werden die Weichen der Zwischen- und Hauptentnahmestation in Richtung Schlechtkanal geschaltet. Ist die Steghöhe in den Preßstationen erreicht, beginnt die Verstellvorrichtung 80 das Kurvensegment 78 in der Auswerfstation 38 in eine Position zu verstellen, wie sie in Fig. 3 dargestellt ist. Ist die Auswerfposition in der Auswerfstation 38 erreicht, wird die Weiche in der Zwischenentnahmestation umgeschaltet,so daß die ausgeworfenen Einschichtpreßlinge über den Transportweg 24 zur Prüfvorrichtung 20 gelangen können. Nach Beendigung des Probenziehens wird die Weiche in der Zwischenentnahmestation wieder in Richtung Schlechtkanal geschaltet. Gleichzeitig wird das Kurvensegment 78 wieder zurückgefahren, so daß die Entnahme von Einschichtpreßlingen beendet wird. Sobald die Auswerfstation 36 ihre ursprüngliche Position wieder erreicht hat, werden durch Verstellung in den Preßstationen die Steghöhen wieder auf den ursprünglichen Wert gebracht. Sobald dies geschehen ist, wird die Ablaufweiche in der Hauptentnahmestation, die vorher, wie erwähnt, ständig in Richtung Schlechtkanal geschaltet war, wieder umgeschaltet, damit die Zweischichtpreßlinge wieder über den normalen Transportweg 12 zur Vorrichtung 14 gelangen können.At the beginning of the sampling, the web heights in the first and the second press stations 40, 50 are brought to a lower value in a temporal connection, which is done by correspondingly adjusting the pressure rollers in the press stations. At the same time, the switches of the intermediate and main removal station are switched towards the bad channel. When the web height in the pressing stations has been reached, the adjusting device 80 begins to adjust the curve segment 78 in the ejection station 38 into a position as shown in FIG. 3. Once the ejection position in the ejection station 38 has been reached, the switch in the intermediate removal station is switched over so that the ejected single-layer compacts can reach the testing device 20 via the transport path 24. After sampling has been completed, the switch in the intermediate sampling station is switched back towards the bad channel. At the same time, the curve segment 78 is moved back again, so that the removal of single-layer compacts is ended. As soon as the ejection station 36 has reached its original position again, the web heights are brought back to the original value by adjustment in the pressing stations. As soon as this has been done, the drain switch in the main removal station, which, as mentioned, was previously switched continuously towards the bad channel, becomes again switched so that the two-layer compacts can again reach the device 14 via the normal transport route 12.

Sollen lediglich die zweiten Schichten separat geprüft werden, ist ebenfalls erforderlich, die ersten Schichten in der beschriebenen Weise auszuwerfen und dann in Richtung Schlechtkanal zu lenken. Die in der zweiten Auswerfstation 48 dann ausgeworfenen einschichtigen Preßlinge gelangen ebenfalls auf den Transportweg 12, müssen jedoch durch eine geeignete Weiche in Richtung Transportweg 26 zur Prüfvorrichtung 20 gelenkt werden.If only the second layers are to be checked separately, it is also necessary to eject the first layers in the manner described and then to steer them in the direction of the bad channel. The single-layer compacts which are then ejected in the second ejection station 48 likewise arrive on the transport path 12, but must be directed towards the test device 20 by a suitable switch in the direction of the transport path 26.

Claims (5)

  1. A method for making double-layer tablets in a two-station rotary press, wherein the powder material is compressed layer on layer in die-holes (54) of a rotating die-plate (52) by means of synchronously rotating pressure rams (59,56) and the two-layer pressed parts are thereafter ejected and discharged in a discharge station (50), and wherein after the compressing operation, for testing purposes, pressed parts of the first layer are discharged in an intermediary discharge station (40) or finished two-layer pressed parts are discharged in a discharge station (50) and directed to a test station (18), while prior to sampling the first layers are compressed in the intermediary discharge station (40) more than during the normal manufacturing operation, characterized in that during sampling the second layers are also compressed and the compressed second layers, at least after discharge of the single-layer pressed parts in the discharge station (50), are directed to a fault channel or also to the test station (18).
  2. An apparatus for making double-layer tablets in a two-station rotary press, comprising a die-plate (52) including die-holes (54) and driven so as to rotate about a vertical axis, and pressure rams (59,56) rotating with the die-plate (52), a first filling station (32), a second pressing station (34,36), a second filling station (42), a second pressing station (44,46), an ejecting station (48) and a discharge station (50) being disposed at the die-plate (52) as seen in the direction of rotation, the pressure rams (53,56) being operated, on the side opposite to the die-plate (52), by pressure rollers (70 to 76) mounted so as to be displaceable towards and away from the pressure rams (59,56) by means of adjustment devices, and an intermediary discharge station (40) including an adjustable ejector cam segment (78) and a stripping device (84), characterized in that the intermediary discharge station (40) includes a discharge switch for selectively directing the arriving pressed parts of the first layer (62) to a fault channel or a test station (20), the pressure rollers (70 to 76) of the first and second pressing stations (34,36 and, respectively, 44,46) are adjusted in timed relationship or synchronously, and the discharge switch is switched towards the fault channel prior to adjustment of the pressure rollers (70 to 76) of the first pressing station (34,36).
  3. An apparatus according to claim 2 or claim 3, characterized in that the ejector cam segment (78) of the ejecting station (48) is adjusted for ejecting purposes only after the pressure roller of the first pressing station (34,36) has been displaced to the new position for compressing the first layer.
  4. An apparatus according to claims 2 or 3, characterized in that the discharge switch is switched towards the test station (20) after the pressure rollers of the first pressing station (34,36) have reached their new positions to effect increased compression.
  5. An apparatus according to any of claims 2 to 4, characterized in that the ejector cam segment (78) of the ejecting station (48) is adjusted by means of an electromechanic apparatus (80).
EP93107324A 1992-06-02 1993-05-06 Process and apparatus for making double-layered tablets on a two station rotary press Expired - Lifetime EP0572816B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4218122A DE4218122C1 (en) 1992-06-02 1992-06-02 Process for pressing two-layer tablets in a double rotary press and device for carrying out the process
DE4218122 1992-06-02

Publications (2)

Publication Number Publication Date
EP0572816A1 EP0572816A1 (en) 1993-12-08
EP0572816B1 true EP0572816B1 (en) 1996-04-17

Family

ID=6460194

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93107324A Expired - Lifetime EP0572816B1 (en) 1992-06-02 1993-05-06 Process and apparatus for making double-layered tablets on a two station rotary press

Country Status (3)

Country Link
US (1) US5350548A (en)
EP (1) EP0572816B1 (en)
DE (2) DE4218122C1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2707213B1 (en) 2011-05-10 2020-02-26 Fette Compacting GmbH Rotary press and method for operating a rotary press

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1264747B1 (en) * 1993-12-10 1996-10-04 Ima Spa ROTARY COMPRESSING MACHINE
DE4412117A1 (en) * 1994-04-08 1995-10-12 Fette Wilhelm Gmbh Method and device for applying powdered lubricant or separating agent to the pressing tools in tabletting machines
US6177125B1 (en) * 1994-08-03 2001-01-23 Gunter M. Voss Method of producing coated tablets
IT1274883B (en) * 1994-08-05 1997-07-25 Ima Spa DOSING DEVICE IN COMPRESSING MACHINES FOR THE PRODUCTION OF TABLETS.
DE19855328A1 (en) * 1998-12-01 2000-06-08 Henkel Kgaa Tablet press
JP3780842B2 (en) * 2000-12-04 2006-05-31 株式会社村田製作所 Powder molding apparatus and powder molding method
KR100463775B1 (en) * 2000-12-04 2004-12-29 가부시키가이샤 무라타 세이사쿠쇼 Powder feeding apparatus and powder forming apparatus
KR20030096365A (en) * 2001-05-07 2003-12-24 가부시키가이샤 기쿠수이세이사쿠쇼 Rotary type compression molding machine
JPWO2003018302A1 (en) * 2001-08-30 2004-12-09 株式会社三和化学研究所 Apparatus for manufacturing molded articles and molded articles that can be produced by the apparatus
US6767200B2 (en) * 2001-09-28 2004-07-27 Mcneil-Ppc, Inc. Systems, methods and apparatuses for manufacturing dosage forms
US7122143B2 (en) 2001-09-28 2006-10-17 Mcneil-Ppc, Inc. Methods for manufacturing dosage forms
US7838026B2 (en) 2001-09-28 2010-11-23 Mcneil-Ppc, Inc. Burst-release polymer composition and dosage forms comprising the same
ITBO20020452A1 (en) * 2002-07-15 2004-01-15 Ima Spa COMPRESSING MACHINE
DE102005007790B4 (en) 2005-02-19 2007-06-28 Fette Gmbh Method and device for the test extrusion of multilayer tablets or coated tablets
DE102005021923C5 (en) * 2005-05-12 2014-03-13 Fette Compacting Gmbh Method for operating a rotary press and rotary press
WO2008016183A1 (en) * 2006-08-04 2008-02-07 Brother Kogyo Kabushiki Kaisha Image forming apparatus
DE102007061081B4 (en) 2007-12-14 2010-04-08 Fette Gmbh Method for testing multilayer tablets
DE102009002449B4 (en) * 2008-04-18 2022-12-22 Korsch Ag Rotary tablet press
DE102008046422B3 (en) * 2008-09-09 2009-11-12 Fette Gmbh Method for testing multilayer tablets in a multiple rotary press
DE102011101287B4 (en) * 2011-05-10 2013-11-14 Fette Compacting Gmbh Wiper device for a rotary press, rotary press and method for operating a rotary press
CN102794922B (en) * 2011-05-26 2014-11-26 许祥熙 Automatic cold press of diamond segment
CN103372994A (en) * 2012-04-25 2013-10-30 北京翰林航宇科技发展有限公司 Tablet machine with three sets of pressing wheel structures
US20220281199A1 (en) * 2019-08-07 2022-09-08 Scitech Centre Sampling of bi-layer tablets

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2944493A (en) * 1956-11-23 1960-07-12 Stokes F J Corp Multi-layer tablet manufacture
US2906214A (en) * 1957-01-28 1959-09-29 Stokes F J Corp Pill press apparatus
DE1291057B (en) * 1960-02-15 1969-03-20 Kilian & Co Gmbh Device for producing tablets having only one layer or an incomplete number of layers in rotary tablet presses
US3063390A (en) * 1960-07-27 1962-11-13 Stokes F J Corp Tablet machine with inspection means
GB952006A (en) * 1962-02-21 1964-03-11 John Holroyd & Company Ltd Multi-layer tablet making machines
DE2639090C3 (en) * 1976-08-31 1979-12-06 Wilhelm Fette Gmbh, 2057 Schwarzenbek Tablet machine
JPS5873993U (en) * 1981-11-12 1983-05-19 三菱電機株式会社 2 cylinder rotary compressor
DE3628757A1 (en) * 1986-08-23 1988-03-03 Fette Wilhelm Gmbh METHOD FOR QUALITY ASSURANCE IN THE PRODUCTION OF TABLETS
US5213738A (en) * 1990-05-15 1993-05-25 L. Perrigo Company Method for making a capsule-shaped tablet
US5158728A (en) * 1991-04-12 1992-10-27 Elizabeth-Hata International, Inc. Multi-layer medicinal tablet forming machine and method for using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2707213B1 (en) 2011-05-10 2020-02-26 Fette Compacting GmbH Rotary press and method for operating a rotary press

Also Published As

Publication number Publication date
US5350548A (en) 1994-09-27
EP0572816A1 (en) 1993-12-08
DE4218122C1 (en) 1994-01-20
DE59302232D1 (en) 1996-05-23

Similar Documents

Publication Publication Date Title
EP0572816B1 (en) Process and apparatus for making double-layered tablets on a two station rotary press
EP1693182B1 (en) Method and apparatus for the trial pressing of multi-layer tablets or coated tablets
DE3331257A1 (en) VACUUM BRICK PRESS
DE102005030312B4 (en) Rotary tabletting machine and method for producing a multilayer tablet
DE3312539C1 (en) Apparatus for the production of boxless sand casting moulds
EP1595456A2 (en) Moulding press and method for pressing meat
EP1166915A2 (en) Device and method for producing gaskets
EP0113874B1 (en) Machine for wrapping and strapping a compressable stack
EP2070692B1 (en) Method for inspecting multiple layer tablets
DE4330171C2 (en) Process for manufacturing brushes and brush manufacturing machine for carrying out the process
DE3333766A1 (en) Briquetting press
DE967423C (en) Rotary press and method for producing pellets with a rotary press
DE102011101286B4 (en) Rotary press and method for operating a rotary press
DE2420726C3 (en) Method and device for the production of pressed bodies with different compositions in layers for heavy-duty electrical contacts
DE102008046422B3 (en) Method for testing multilayer tablets in a multiple rotary press
DE2328368B2 (en) THERMO FORMING DEVICE FOR THE PRODUCTION OF MOLDINGS OF LARGE DEPTH FROM A RELATIVELY THICK PLASTIC STRIP
DE595550C (en) Continuously working slide press
DE4415177A1 (en) Press with first and second pressing stations
DE375263C (en) Molding press
DE2357309B2 (en) Press mold for the powder metallurgical production of contact nozzles for welding machines
DE19858169A1 (en) Preparation of dough portions by extrusion under low pressure
DE102005021923C5 (en) Method for operating a rotary press and rotary press
DE1961407C (en) Method for feeding tobacco under simultaneous compression to a processing device and device for carrying out the method for dividing portions of the same weight from a tobacco rod
DE19624442A1 (en) Screen printing method
DE102013103266A1 (en) Method and pressing tool for isostatic pressing of objects made of ceramic granules

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19930924

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE FR GB IT LI NL

17Q First examination report despatched

Effective date: 19950202

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR GB IT LI NL

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: ISLER & PEDRAZZINI AG PATENTANWAELTE

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19960423

REF Corresponds to:

Ref document number: 59302232

Country of ref document: DE

Date of ref document: 19960523

ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

REG Reference to a national code

Ref country code: CH

Ref legal event code: PCAR

Free format text: ISLER & PEDRAZZINI AG;POSTFACH 1772;8027 ZUERICH (CH)

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20090527

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20090528

Year of fee payment: 17

Ref country code: FR

Payment date: 20090429

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20090611

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20090506

Year of fee payment: 17

Ref country code: DE

Payment date: 20090710

Year of fee payment: 17

REG Reference to a national code

Ref country code: NL

Ref legal event code: V1

Effective date: 20101201

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20100506

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20110131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100531

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100506

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20101201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20101201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100506