EP0990510B1 - Method for monitoring the production in the manufacturing of tablets in a rotary machine - Google Patents
Method for monitoring the production in the manufacturing of tablets in a rotary machine Download PDFInfo
- Publication number
- EP0990510B1 EP0990510B1 EP99118500A EP99118500A EP0990510B1 EP 0990510 B1 EP0990510 B1 EP 0990510B1 EP 99118500 A EP99118500 A EP 99118500A EP 99118500 A EP99118500 A EP 99118500A EP 0990510 B1 EP0990510 B1 EP 0990510B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- production
- tablets
- readings
- mean value
- pressing force
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/005—Control arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/02—Presses 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
- B30B11/08—Presses 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/0094—Press load monitoring means
Definitions
- the invention relates to a method for production monitoring in the manufacture of tablets in a rotary tablet machine.
- the invention is therefore based on the object, a method for production monitoring in the production of compacts in rotary tableting machines to indicate the variations in the weight of the tablet in extremely small limits.
- Outliers for the pressing force measurements can be caused by, for example Double pressing, signal disturbances in the measuring chain, damage of Press surfaces, unwanted coatings on the stamp, etc.
- the ordinal number of the stamp pair whose readings led to elimination, stored. It can be that outliers are caused by permanent defects, for example Break of a stamp, too big or too small stamp length etc .. With the invention it is recognized in which pair of stamps the error occurs, so that it can then be eliminated.
- the statistical method that can be used in the invention and also referred to as the Shapiro-Wilks test or the Nalimov test known in itself. Thereafter, a table is set up which the measured values per series of measurements, for example the complete number of pairs of stamps per rotary press, assigning a value that will be reached at least must be 95% of all readings in the middle range.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Medical Preparation Storing Or Oral Administration Devices (AREA)
Description
Die Erfindung bezieht sich auf ein Verfahren zur Produktionsüberwachung bei der Herstellung von Tabletten in einer Rundläufertablettiermaschine.The invention relates to a method for production monitoring in the manufacture of tablets in a rotary tablet machine.
Aus EP 0 431 269 ist bekannt, bei der Herstellung von Tabletten die aufgewandten Preßkräfte fortlaufend zu messen und mit Sollwerten zu vergleichen. Liegt ein gemessener maximaler Preßkraftwert außerhalb von Sollwertgrenzen, wird die entsprechende Tablette aussortiert. Jedes Stempelpaar der Rundläuferpresse erhält eine Ordnungszahl, so daß bei einer Abweichung vom Sollwert feststeht, welches Stempelpaar bzw. welche Matrizenbohrung betroffen ist. Mit Hilfe eines derartigen Verfahrens läßt sich die Güte der hergestellten Tabletten laufend überwachen.From EP 0 431 269 it is known that in the production of tablets the applied Pressing forces continuously to measure and compare with setpoints. If a measured maximum pressing force value is outside of Setpoint limits, the corresponding tablet is sorted out. Each stamp pair the rotary press receives an atomic number, so that at a Deviation from the setpoint is known which pair of dies or which Die hole is affected. With the help of such a method leaves Monitor the quality of the tablets produced continuously.
Aus der genannten Druckschrift ist auch bekannt, durch den Einsatz eines Winkelimpulsgebers die jeweilige Stellung der Matrizenscheibe zu ermitteln und mit den maximalen Preßkraftwerten zu koordinieren. Dadurch läßt sich eine Überwachung fortführen auch bei dem Auswechseln einer Matrizenscheibe, ohne daß es einer Umstellung der elektronischen Einrichtung bedarf.From the cited document is also known through the use of a Angle encoder to determine the respective position of the die plate and to coordinate with the maximum pressing force values. This can be done continue monitoring even when replacing a die plate, without there being a conversion of the electronic device requirement.
Aus EP 0 350 563 und US-A-4 817 006 ist auch bekanntgeworden, aus den Meßergebnissen für die maximalen Preßkräfte einen Mittelwert zu bilden und mit Toleranzgrenzen zu vergleichen. Der Verlauf der Preßkraftwerte gibt Aufschluß über den Füllgrad der Matritzenbohrungen. Überschreitet der Mittelwert die Toleranzgrenzen, wird eine Nachregelung der Befüllung der Matrizenbohrungen vorgenommen. Auf diese Weise kann relativ rasch eine Regelung erfolgen. Für die Ermittlung von Mittelwerten reichen einige Umläufe des Pressenrotors aus, wodurch ein verwendbarer Mittelwert innerhalb von einigen Sekunden zur Verfügung steht. Die Regelung der Befüllung kann daher ebenfalls in kürzester Zeit erfolgen. Fehler, die aufgrund ungenauen Füllgrads entstehen, können daher relativ rasch beseitigt werden.From EP 0 350 563 and US-A-4 817 006 it has also become known from the measurement results for the maximum pressing forces to form an average and with tolerance limits to compare. The course of the pressing force values provides information the degree of filling of Matratzenbohrungen. If the mean value exceeds the tolerance limits, is a readjustment of the filling of the die holes performed. In this way, a regulation can be done relatively quickly. For determining averages, some rotations of the press rotor are sufficient which makes a usable mean within some Seconds is available. The regulation of the filling can therefore also done in a short time. Errors due to inaccurate fill level can therefore be eliminated relatively quickly.
Aus der EP 0 350 563 ist auch bekanntgeworden, Toleranzgrenzen für die Preßkräfte jedes einzelnen Stempelpaars vorzugeben. Werden die Toleranzgrenzen überschritten, ist dies ein Zeichen für die unzureichende Funktion dieses Stempelpaars, beispielsweise aufgrund eines Bruchs, des Anhaftens von Material, des Wegplatzens der Preßfläche am Stempelkopf und dergleichen.From EP 0 350 563 has also become known, tolerance limits for the Specify pressing forces of each stamp pair. Be the tolerance limits exceeded, this is a sign of inadequate function this stamp pair, for example, due to a break, sticking of material, the wegplatzens the pressing surface on the stamp head and the like.
Es ist für die Qualiltätseinhaltung schließlich auch bekannt, von Zeit zu Zeit, beispielsweise in einem Abstand von ¼ Stunde, Proben zu ziehen. Eine Reihe von Tabletten, zum Beispiel 20, wird der Produktion entnommen. Aus dem Gewicht der Tabletten wird ein Mittelwert gebildet, der mit einem Sollmittelwert verglichen wird. Weicht der gemessene Mittelwert von vorgegebenen Toleranzgrenzen ab, wird die Zufuhr von zu pressendem Material nachgeregelt.Finally, it is also known for quality awareness, from time to time, for example, at a distance of ¼ hour to draw samples. A Row of tablets, for example 20, is removed from production. Out The weight of the tablets is an average formed with a Target mean value is compared. Does the measured average deviate from given ones? Tolerance limits, the supply of material to be pressed readjusted.
Bei der Ermittlung von Mittelwerten für die Preßkraft kann es zu Verfälschungen kommen, welche den Mittelwert um ein Maß verschieben, das den tatsächlichen Verhältnissen nicht entspricht. So kann aufgrund eines Fehlers in der Datenübertragung ein fehlerhafter Meßwert auf den Rechner übertragen werden. Dieser Fehler kann vorübergehend oder permanent auftreten. Ferner kann durch eine Beschädigung an einem Stempelpaar oder Anhaften von Material oder durch unregelmäßige Materialzufuhr ein Preßkraftwert zustande kommen, der signifikant von den übrigen Preßkraftwerten einer Meßreihe abweicht. Die beschriebenen Fehler oder Störungen führen zu einem Mittelwert und damit zu einer Nachregelung für die Materialbefüllung, welche durch die übrigen Preßkraftwerte nicht gerechtfertigt ist. Mithin verursacht eine derartige Füllgradregelung unerwünschte Schwankungen im Tablettengewicht.When determining mean values for the pressing force, it can lead to distortions come that shift the mean by a measure that does not correspond to the actual conditions. So may be due to a Error in the data transmission a faulty measured value on the computer be transmitted. This error can occur temporarily or permanently. Furthermore, by damage to a pair of stamps or Adhesion of material or by irregular material feed a pressing force value come about, which significantly from the other Presskraftwerten deviates from a series of measurements. The described errors or faults lead to an average and thus to a readjustment for the material filling, which is not justified by the other pressing force values. Consequently, such a filling degree control causes undesirable fluctuations in tablet weight.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zur Produktionsüberwachung bei der Herstellung von Preßlingen in Rundläufertablettiermaschinen anzugeben, bei dem Schwankungen des Tablettengewichts in äußerst geringen Grenzen gehalten werden können.The invention is therefore based on the object, a method for production monitoring in the production of compacts in rotary tableting machines to indicate the variations in the weight of the tablet in extremely small limits.
Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.This object is solved by the features of patent claim 1.
Bei dem erfindungsgemäßen Verfahren findet vor der Mittelwertbildung die Untersuchung jeder Meßreihe auf Meßwerte und deren Eliminierung statt, die signifikant von den übrigen abweichen. Mit anderen Worten, es wird ein Ausreißertest vorgenommen, mit dem signifikant abweichende Werte einer Meßreihe eliminiert werden und somit nicht in die Mittelwertsberechnungen und in die Berechnung der Standardabweichung eingehen.In the method according to the invention takes place before the averaging the Examination of each series of measurements for measured values and their elimination instead, which differ significantly from the rest. In other words, it will be one Outlier test made, with the significantly different values of a Measurement series are eliminated and thus not in the averaging calculations and into the calculation of the standard deviation.
Ausreißer für die Preßkraftmessungen können zum Beispiel entstehen durch Doppelpressungen, Signalstörungen in der Meßkette, Beschädigung von Preßflächen, unerwünschte Beschichtungen am Stempel usw. Outliers for the pressing force measurements can be caused by, for example Double pressing, signal disturbances in the measuring chain, damage of Press surfaces, unwanted coatings on the stamp, etc.
Mit Hilfe des erfindungsgemäßen Verfahrens läßt sich mithin die Regelung einer Tablettiermaschine auf möglichst genaue Werte für das Gewicht der Preßlinge erreichen. Schwankungen im Tablettengewicht sind daher minimal.With the help of the method according to the invention can therefore be the scheme a tabletting machine on the most accurate values for the weight of the Reach compacts. Fluctuations in tablet weight are therefore minimal.
Nach einer Ausgestaltung der Erfindung wird die Ordnungszahl des Stempelpaars, dessen Meßwerte zur Eliminierung führten, gespeichert. Es kann sein, daß Ausreißerwerte durch ständige Defekte verursacht sind, beispielsweise Bruch eines Stempels, eine zu große oder zu kleine Stempellänge usw.. Mit der Erfindung wird erkannt, bei welchem Stempelpaar der Fehler auftritt, so daß er anschließend beseitigt werden kann.According to one embodiment of the invention, the ordinal number of the stamp pair, whose readings led to elimination, stored. It can be that outliers are caused by permanent defects, for example Break of a stamp, too big or too small stamp length etc .. With the invention it is recognized in which pair of stamps the error occurs, so that it can then be eliminated.
Das statistische Verfahren, das bei der Erfindung angewendet werden kann und auch als Shapiro-Wilks-Test oder als Nalimov-Test bezeichnet wird, ist an sich bekannt. Danach wird eine Tabelle aufgestellt, welche den Meßwerten je Meßreihe, beispielsweise der kompletten Anzahl von Stempelpaaren pro Rundläuferpresse, einem Wert zuordnet, der mindestens erreicht werden muß, damit 95 % aller Meßwerte im Mittelbereich liegen. The statistical method that can be used in the invention and also referred to as the Shapiro-Wilks test or the Nalimov test known in itself. Thereafter, a table is set up which the measured values per series of measurements, for example the complete number of pairs of stamps per rotary press, assigning a value that will be reached at least must be 95% of all readings in the middle range.
Zur Überwachung der Regelung einer Rundläufertablettiermaschine wird üblicherweise ein Rechner eingesetzt. Mit den dafür verwendeten Rechnertypen ist es ohne weiteres möglich, innerhalb von 1 bis 2 Sekunden jeweils Mittelwerte zu errechnen, um erforderlichenfalls eine Nachregelung der Befüllung vornehmen zu können. Die Eliminierung von Ausreißem erfordert einen zusätzlichen, nicht unerheblichen Rechenaufwand, der jedoch gleichwohl ohne weiteres in minimaler Rechenzeit erledigt werden kann.To monitor the control of a rotary tableting machine usually a calculator used. With the used computer types it is easily possible within 1 to 2 seconds respectively To calculate, if necessary, a readjustment of the To make filling. The elimination of outliers requires an additional, not insignificant computational effort, however nevertheless can be done easily in minimal computing time.
Claims (2)
- A method for the production monitoring with the manufacture of tablets in a rotary tabletting machine, with a row of upper and lower punches arranged in pairs, which cooperate with matrix bores, in which for each punch pair the maximum of the pressing force is measured, via a preselected number of readings also called measuring series an actual mean value is computed and compared to a nominal mean value and the supply of material to the individual matrix bores the filling degree is changed when the deviation exceeds a predetermined amount, characterized in that before forming the mean value those pressing force readings of each measuring series, which significantly deviate with respect to other readings, are eliminated whereby a freak value test is carried out.
- The method of claim 1, characterized in that the order number of the pair of punches whose reading is eliminated is stored and the production is interrupted when the order number has reached a predetermined frequency.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19844390A DE19844390B4 (en) | 1998-09-28 | 1998-09-28 | Process for producing tablets in a rotary tablet machine |
DE19844390 | 1998-09-28 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0990510A2 EP0990510A2 (en) | 2000-04-05 |
EP0990510A3 EP0990510A3 (en) | 2000-04-12 |
EP0990510B1 true EP0990510B1 (en) | 2005-02-16 |
Family
ID=7882485
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99118500A Expired - Lifetime EP0990510B1 (en) | 1998-09-28 | 1999-09-18 | Method for monitoring the production in the manufacturing of tablets in a rotary machine |
Country Status (3)
Country | Link |
---|---|
US (1) | US6319435B1 (en) |
EP (1) | EP0990510B1 (en) |
DE (2) | DE19844390B4 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050200038A1 (en) * | 2004-03-12 | 2005-09-15 | Courtoy Nv | Method for controlling a rotary tablet press and such a press |
DE102005007790B4 (en) * | 2005-02-19 | 2007-06-28 | Fette Gmbh | Method and device for the test extrusion of multilayer tablets or coated tablets |
CN101460297B (en) * | 2006-05-15 | 2012-10-10 | 库尔图瓦股份有限公司 | Method for controlling a tablet press and such a press |
WO2008016183A1 (en) * | 2006-08-04 | 2008-02-07 | Brother Kogyo Kabushiki Kaisha | Image forming apparatus |
CN108572602B (en) * | 2018-07-23 | 2024-03-15 | 上海海得控制***股份有限公司 | Control device of tablet press |
DE102022131493A1 (en) | 2022-11-29 | 2024-05-29 | Fette Compacting Gmbh | Method for evaluating the condition of press dies of a rotary press and rotary press |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6025277B2 (en) | 1979-06-18 | 1985-06-17 | 三井東圧化学株式会社 | heat sensitive recording sheet |
US4570229A (en) * | 1983-09-19 | 1986-02-11 | Pennwalt Corporation | Tablet press controller and method |
US4817006A (en) * | 1986-03-28 | 1989-03-28 | Thomas Engineering, Inc. | Pharmaceutical tablet press control mechanism |
DE3628757A1 (en) * | 1986-08-23 | 1988-03-03 | Fette Wilhelm Gmbh | METHOD FOR QUALITY ASSURANCE IN THE PRODUCTION OF TABLETS |
DE3823417A1 (en) * | 1988-07-11 | 1990-01-18 | Fette Wilhelm Gmbh | METHOD AND DEVICE FOR MONITORING THE PRESSING FORCE OF THE STAMP OF A TABLET PRESS |
DE3939956A1 (en) * | 1989-12-02 | 1991-06-06 | Fette Wilhelm Gmbh | METHOD AND DEVICE FOR MONITORING THE PRESSING FORCE OF A TABLETING MACHINE |
US5838571A (en) * | 1996-01-29 | 1998-11-17 | Alza Corporation | Tablet press monitoring and controlling method and apparatus |
-
1998
- 1998-09-28 DE DE19844390A patent/DE19844390B4/en not_active Expired - Lifetime
-
1999
- 1999-09-18 EP EP99118500A patent/EP0990510B1/en not_active Expired - Lifetime
- 1999-09-18 DE DE59911636T patent/DE59911636D1/en not_active Expired - Lifetime
- 1999-09-27 US US09/406,585 patent/US6319435B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE59911636D1 (en) | 2005-03-24 |
EP0990510A2 (en) | 2000-04-05 |
DE19844390B4 (en) | 2005-09-22 |
EP0990510A3 (en) | 2000-04-12 |
US6319435B1 (en) | 2001-11-20 |
DE19844390A1 (en) | 2000-04-06 |
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