EP0990510A2 - 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
- EP0990510A2 EP0990510A2 EP99118500A EP99118500A EP0990510A2 EP 0990510 A2 EP0990510 A2 EP 0990510A2 EP 99118500 A EP99118500 A EP 99118500A EP 99118500 A EP99118500 A EP 99118500A EP 0990510 A2 EP0990510 A2 EP 0990510A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- production
- eliminated
- mean value
- values
- series
- 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
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 monitoring production in the production of tablets in a rotary tablet machine.
- EP 0 350 563 has also disclosed tolerance limits for the To specify the pressing forces of each individual pair of punches. Will the tolerance limits exceeded, this is a sign of the insufficient function this pair of stamps, for example due to a break, the sticking of material, the bursting of the pressing surface on the stamp head and the like.
- the invention is therefore based on the object of a method for monitoring production in the production of compacts in rotary tableting machines to indicate at which fluctuations in tablet weight in extremely low limits can be kept.
- Outliers for the press force measurements can arise, for example, from Double pressures, signal interference in the electrode, damage to Pressing surfaces, unwanted coatings on the stamp etc.
- the regulation can therefore be carried out a tablet machine to the most exact possible values for the weight of the Reach compacts. Fluctuations in tablet weight are therefore minimal.
- the ordinal number of the stamp pair whose measured values led to elimination. It can be that outlier values are caused by constant defects, for example Breakage of a stamp, stamp length too large or too small etc. With the invention it is recognized which pair of stamps the error occurs so that it can then be eliminated.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Medical Preparation Storing Or Oral Administration Devices (AREA)
Abstract
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 monitoring production in the production 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 those used in the manufacture of tablets Measure pressing forces continuously and compare them with target values. Is a measured maximum pressing force value outside of The corresponding tablet is sorted out. Each pair of stamps the rotary press receives an atomic number, so that at one Deviation from the target value is certain, which pair of punches or which Die drilling is affected. With the help of such a method monitor the quality of the tablets produced on an ongoing basis.
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.It is also known from the cited document through the use of a To determine the respective position of the die plate and coordinate with the maximum press force values. This allows continue monitoring even when a die plate is replaced, without having to change the electronic device requirement.
Aus EP 0 350 563 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.It has also become known from EP 0 350 563, from the measurement results for the maximum press forces form an average and with tolerance limits to compare. The course of the press force values provides information about the degree of filling of the die holes. If the mean exceeds the tolerance limits, will readjust the filling of the die holes performed. In this way, regulation can take place relatively quickly. A few revolutions of the press rotor are sufficient to determine average values from, making a usable average within a few Seconds is available. The regulation of the filling can therefore also take place in the shortest possible time. Errors due to inaccurate fill level arise, 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.EP 0 350 563 has also disclosed tolerance limits for the To specify the pressing forces of each individual pair of punches. Will the tolerance limits exceeded, this is a sign of the insufficient function this pair of stamps, for example due to a break, the sticking of material, the bursting of 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.It's also known for quality compliance from time to time, for example, at intervals of ¼ hour to take samples. A Series of tablets, for example 20, are taken from production. Out The weight of the tablets is averaged with a Target mean value is compared. Does the measured mean deviate from the specified one Tolerance limits, the supply of material to be pressed adjusted.
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 Materialzuführ 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, there can be falsifications come, which shift the mean by an amount that does not correspond to the actual circumstances. So because of a Error in the data transmission a faulty measured value on the computer be transmitted. This error can occur temporarily or permanently. Furthermore, damage to a pair of punches or Adherence of material or through irregular material supply a compression force value come about, which is significantly different from the other press force values deviates from a series of measurements. The errors or faults described lead to an average and thus to a readjustment for the material filling, which is not justified by the other press force values. Such a fill level control therefore 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 of a method for monitoring production in the production of compacts in rotary tableting machines to indicate at which fluctuations in tablet weight in extremely low limits can be kept.
Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.This object is achieved 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, the Examination of each series of measurements for measured values and their elimination instead, that differ significantly from the rest. In other words, it will be a Outlier test carried out, with the significantly different values of a Series of measurements are eliminated and therefore not in the mean value calculations and go 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 press force measurements can arise, for example, from Double pressures, signal interference in the electrode, damage to Pressing 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 aid of the method according to the invention, the regulation can therefore be carried out a tablet machine to the most exact possible 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 measured values led to elimination. It can be that outlier values are caused by constant defects, for example Breakage of a stamp, stamp length too large or too small etc. With the invention it is recognized 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 is also called the Shapiro-Wilks test or the Nalimov test known per se. Then a table is set up, which the measured values per measurement series, for example the complete number of pairs of punches per rotary press, assigns a value that is at least achieved must, so that 95% of all measured values are 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 regulation of a rotary tablet machine usually a computer is used. With the computer types used for this it is easily possible within 1 to 2 seconds each Calculate mean values to readjust the To be able to fill. Eliminating outliers requires an additional, not inconsiderable computational effort, but nevertheless can be done easily in minimal computing time.
Claims (2)
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 true EP0990510A2 (en) | 2000-04-05 |
EP0990510A3 EP0990510A3 (en) | 2000-04-12 |
EP0990510B1 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) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108572602A (en) * | 2018-07-23 | 2018-09-25 | 上海海得控制***股份有限公司 | A kind of control device of tablet press machine |
Families Citing this family (5)
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 |
EP2021168B1 (en) * | 2006-05-15 | 2016-11-02 | GEA Process Engineering nv | 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 |
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 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
EP0350563A2 (en) * | 1988-07-11 | 1990-01-17 | Wilhelm Fette GmbH | Method and apparatus for monitoring the press loads of the punches in a tablet press |
US4999151A (en) * | 1986-08-23 | 1991-03-12 | Firma Wilhelm Fette Gmbh | Method of quality assurance in the manufacture of tablets |
EP0431269A1 (en) * | 1989-12-02 | 1991-06-12 | Wilhelm Fette GmbH | Method and device for monitoring the pressing forces of a pelleting machine |
WO1997027044A1 (en) * | 1996-01-29 | 1997-07-31 | Alza Corporation | Tablet press monitoring and controlling method and apparatus |
Family Cites Families (1)
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 |
-
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
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
US4999151A (en) * | 1986-08-23 | 1991-03-12 | Firma Wilhelm Fette Gmbh | Method of quality assurance in the manufacture of tablets |
EP0350563A2 (en) * | 1988-07-11 | 1990-01-17 | Wilhelm Fette GmbH | Method and apparatus for monitoring the press loads of the punches in a tablet press |
EP0431269A1 (en) * | 1989-12-02 | 1991-06-12 | Wilhelm Fette GmbH | Method and device for monitoring the pressing forces of a pelleting machine |
WO1997027044A1 (en) * | 1996-01-29 | 1997-07-31 | Alza Corporation | Tablet press monitoring and controlling method and apparatus |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108572602A (en) * | 2018-07-23 | 2018-09-25 | 上海海得控制***股份有限公司 | A kind of control device of tablet press machine |
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 |
Also Published As
Publication number | Publication date |
---|---|
EP0990510B1 (en) | 2005-02-16 |
EP0990510A3 (en) | 2000-04-12 |
DE59911636D1 (en) | 2005-03-24 |
DE19844390A1 (en) | 2000-04-06 |
US6319435B1 (en) | 2001-11-20 |
DE19844390B4 (en) | 2005-09-22 |
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