EP0698481B1 - Fuzzysteuerungsverfahren zur Qualitätssicherung bei der Tablettenherstellung - Google Patents
Fuzzysteuerungsverfahren zur Qualitätssicherung bei der Tablettenherstellung Download PDFInfo
- Publication number
- EP0698481B1 EP0698481B1 EP94250211A EP94250211A EP0698481B1 EP 0698481 B1 EP0698481 B1 EP 0698481B1 EP 94250211 A EP94250211 A EP 94250211A EP 94250211 A EP94250211 A EP 94250211A EP 0698481 B1 EP0698481 B1 EP 0698481B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressing force
- height
- weight
- change
- hardness
- 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
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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
Definitions
- the invention relates to a method for Quality assurance in tablet manufacturing through Presses according to the preamble of claim 1.
- An important quality parameter for tablet production is compliance with the given Tablet weight, which with sufficient mixing quality compliance with the limits for the content of active substances guaranteed.
- the basis for any automatic The control of a tableting machine is the Relationship between measured maximum pressing force a tablet and the mass of the into the matrix filled good (tablet weight). There is a direct relationship between tablet weight and that for the production of the controlled Tablet necessary pressing force. This connection is used for automatic monitoring and Control units on rotary presses used.
- Dependent on of the material to be compressed is each tablet weight at a given by the pressing tools Tablet form and a set tablet height assigned a certain pressing force. Fluctuates Now with a constant tablet height, the filling quantity and hence the tablet weight, resulting in direct dependency a change in the pressing force.
- the parameters become discontinuous Weight, height and hardness of the tablet measured, whereby Deviations from the target values for specifying a lead to new pressing force setpoints. At altitude or Hardness deviations become the new pressing force setpoint regulated by a web height adjustment.
- EP-0.261.358 B1 describes a method for quality assurance in the manufacture of tablets described. After that, during the manufacture of the Tablets are drawn from a variety of samples Tablets exist, their common weight is is compared with the target weight value, and where the tableting machine corresponds to the The deviation between the actual value and the target value is readjusted the tablet weight to the TARGET value bring to. Before readjusting the tablet machine are the weights of each Tablets of the sample measured and compared. At Determination of one or more in the weight of the TARGET value significantly different tablets of the sample the statistics are corrected by means of a correction calculation and the corrected value is used for readjustment.
- the invention is therefore based on the object a quality assurance procedure at To develop tablet manufacture by pressing which all the necessary regulatory mechanisms for Keeping the tablet weight and the tablet height constant and hardness so that a quick Correction of deviations is guaranteed and after which the limit values are also automatically optimized can be.
- the tablets are caused to fluctuate by different filling ratios on the matrices of the Do not press only after determining the mean from a larger sample and only at this point in time there is a regulation, but that Tendencies of a changing in the same direction Value recorded in good time or earlier than before can be.
- the invention is based on one in the Drawing shown embodiment of the Quality assurance process in tablet manufacturing thanks to a modern high-performance rotary press explained in more detail.
- the only figure shows a controller model for simultaneous Regulation of tablet parameters weight, height and hardness.
- the control system is divided into control circuits R1 to R5, which are connected to one another in such a way that they run parallel and nested one inside the other.
- the first control circuit R1 maintains the actual pressing force PK IST constant at the value of the target pressing force PK target by changing the dosage ⁇ D.
- the actual pressing force PK IST is the rigid or sliding average of several individual pressing forces at the stamp stations of the press.
- the first input to the first control circuit R1 is the value of Preßkraftabweichung ⁇ PK between the target pressing force PK SOLL and the actual pressing force PK IST.
- the control circuit R1 is acted upon by a second input variable, which is formed by the sensitivity of the pressing force dosing dPK / dD.
- the sensitivity dPK / dD determines the accuracy of the pressing force control as a function of the change in dosage ⁇ D and is adjusted to the control during operation of the press, ie the sensitivity dPK / dD is adaptive
- the weight G, the height T and the hardness H of the tablets are measured continuously and a moving average is calculated.
- a new value for the SET pressing force PK SOLL is calculated in the second control circuit R2, which in turn generates a dosage change ⁇ D in the first control circuit R1, whereby the weight deviation ⁇ G is compensated for.
- the variation of the target pressing force PK SOLL is determined by the value ⁇ PK SOLL.
- a sensitivity weight dG / dPK is applied as the second input variable, which determines the accuracy of the weight control as a function of the change in the pressing force ⁇ PK SHOULD .
- This sensitivity dG / dPK is also adaptive and is adapted to the regulation during the tablet production process.
- the values for the height deviation ⁇ T and for the sensitivity height dT / dh are applied as input variables to the third control circuit R3, the values for the hardness deviation ⁇ H and the sensitivity hardness dH / dh are applied to the input of the fourth control circuit R4.
- the sensitivities dT / dh and dH / dh are again adaptive.
- a deviation between the SET pressure force web height PK SOLLST and the ACTUAL pressure force PK IST is corrected by a change in web height by the value ⁇ ST.
- the second input variable on the fifth control circuit R5 is the sensitivity-compression force web height dPK / ie with adaptive properties.
- control loops R1 and R5 work alternatively.
- All control loops R1 to R5 each work continuously. By a preferably sliding Averaging of the individual control variables current values are always available.
- the Control loops R1 to R5 can also each in several sub-circles are divided, e.g. depending on Control deviation different characteristics exhibit.
- the limit values for the pressing force PK, at whose Reached the press stopped and / or tablets sorted out are determined adaptively by from the correlation between the data measured during operation between the pressing force PK and the weight G, the height T and the hardness H is determined. This Determination can also take place on a stamp basis. At predetermined limits for the weight G, the height T and the hardness H can be deduced from this context determine the associated press force limits.
- control system is based on of great complexity, preferably by methods of FUZZY set theory.
- the technical sizes of the controller model are fuzzyfied by linguistic Variables are implemented, e.g. Weight deviation, Sensitivity weight, height deviation etc. These linguistic variables become terms assigned, such as "low, medium, high” where these terms each represent fuzzy sets.
- the Terms receive membership functions with their Help it is possible for any linguistic value Variables the degree of belonging to the to determine individual terms. For example, one Weight deviation of 5mg the condition "medium Deviation "to grade 0.2, the condition” high deviation " to grade 0.7.
- the variables are linked using FUZZY operators, such as. "Minimum operator, maximum Operator, gamma operator "or the like.
- the blurred information is processed by means of production rules, which by methods of FUZZY inference are processed, e.g. MAX-MIN / MAX-PROD inference or FAM / inference and others.
- Output variables, which are now called “FUZZY values” are defuzzified, i.e. into the "sharp” "Dosage change” and "Web height change” manipulated variables converted.
- FUZZY values are defuzzified, i.e. into the "sharp” "Dosage change” and "Web height change” manipulated variables converted.
- a defuzzification method is preferably the area center of gravity applied, but also other methods such as maximum average method, Maximum focus method and others are possible.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Medical Preparation Storing Or Oral Administration Devices (AREA)
- Medicinal Preparation (AREA)
- Glanulating (AREA)
Description
Claims (11)
- Verfahren zur Qualitätssicherung bei der Tablettenherstellung durch Pressen über die Einflußnahme auf die Preßkraft, auf das Gewicht, auf die Härte und die Höhe der Tabletten mittels Regler,
dadurch gekennzeichnet, daß das Regelungssystem in mehrere sich beeinflussende, im wesentlichen parallel ablaufende Regelungskreise (R1 bis R5) zur gleichzeitigen Regelung der Preßkraft (PK) und der Tablettenparameter Gewicht (G), Höhe (T) und Härte (H) aufgeteilt wird. - Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß in einem ersten Regelungskreis (R1) die IST-Preßkraft (PKIST) durch Dosierungsänderung (ΔD) auf den Wert der Soll-Preßkraft (PKSOLL) konstant gehalten wird und daß in einem dazu parallel ablaufenden zweiten Regelungskreis (R2) das Tablettengewicht (G) gemessen und entsprechend der Gewichtsabweichung (ΔG) ein neuer Wert für die Soll-Preßkraft (PKSOLL) berechnet wird, und daß im ersten Regelungskreis (R1) eine Dosierungsänderung (ΔD) erzeugt und die Gewichtsabweichung (ΔG) ausgeglichen wird, daß in einem dritten Regelungskreis (R3) die Höhenabweichung (ΔT) und in einem vierten Regelungskreis (R4) die Härteabweichung (ΔH) gemessen werden, und daß bei vorhandenen Abweichungen (ΔT, ΔH) jeweils neue Werte für die Soll-Preßkraft-Steghöhe (PKSOLLST) berechnet werden, und daß in einem fünften Regelungskreis (R5) eine Abweichung zwischen dem Wert der Soll-Preßkraft-Steghöhe (PKSOLLST) und dem Wert der IST-Preßkraft (PKIST) durch eine Steghöhenverstellung (ΔST) ausgeregelt wird.
- Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die IST-Preßkraft (PKIST) aus dem starren oder gleitenden Mittelwert mehrerer Einzelpreßkräfte gebildet wird.
- Verfahren nach den Ansprüchen 2 und 3, dadurch gekennzeichnet, daß parallel zur Preßkraftmessung kontinuierlich das Gewicht (G), die Höhe (T) und die Härte (H) der Tabletten gemessen und zu je einem gleitenden Mittelwert berechnet werden.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die Meßwerte der Höhe (T), der Härte (H) und des Gewichts (G) der Tabletten den einzelnen Stempelstationen zugeordnet werden.
- Verfahren nach den Ansprüchen 2 bis 5, dadurch gekennzeichnet, daß der erste Regelungskreis (R1) und der fünfte Regelungskreis (R5) alternativ arbeiten.
- Verfahren nach den Ansprüchen 1 bis 6, dadurch gekennzeichnet, daß an die Eingänge der Regelungskreise (R1 bis R5) neben den jeweiligen Regelabweichungen (ΔPK, ΔG, ΔT, ΔH, PKSOLLST) jeweils auch die Empfindlichkeiten (dG/dPK,dT/dh, dH/dh, dPK/dh, dPK/dD) der Regelung angelegt werden.
- Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß die Empfindlichkeiten (dG/dPK,dT/dh, dH/dh, dPK/dh, dPK/dD) während des Betriebes den Regelungen angepaßt werden.
- Verfahren nach den Ansprüchen 1 bis 8, dadurch gekennzeichnet, daß die Regelungskreise (R1 bis R5) jeweils in mehrere Teilregelungsblöcke unterteilt werden.
- Verfahren nach den Ansprüchen 1 bis 9, dadurch gekennzeichnet, daß die Grenzwerte für die Preßkraft (PK) adaptiv an die im laufenden Betrieb gemessenen Werte und die vorgegebenen Grenzwerte für das Gewicht (G), die Höhe (T) und die Härte (H) der Tabletten bestimmt werden.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß für die Beschreibung, den Entwurf, die Realisierung und die Optimierung der Regelungskreise (R1 bis R5) Methoden der FUZZY-Logik angewendet werden.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4315680A DE4315680C2 (de) | 1993-05-05 | 1993-05-05 | Regelung von Tablettenparametern bei der Herstellung auf Rundlauf-Pressen |
EP94250211A EP0698481B2 (de) | 1993-05-05 | 1994-08-24 | Fuzzysteuerungsverfahren zur Qualitätssicherung bei der Tablettenherstellung |
ES94250211T ES2130350T5 (es) | 1993-05-05 | 1994-08-24 | Procedimiento para asegurar la calidad en la fabricacion de tabletas. |
DE59407774T DE59407774D1 (de) | 1993-05-05 | 1994-08-24 | Fuzzysteuerungsverfahren zur Qualitätssicherung bei der Tablettenherstellung |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4315680A DE4315680C2 (de) | 1993-05-05 | 1993-05-05 | Regelung von Tablettenparametern bei der Herstellung auf Rundlauf-Pressen |
EP94250211A EP0698481B2 (de) | 1993-05-05 | 1994-08-24 | Fuzzysteuerungsverfahren zur Qualitätssicherung bei der Tablettenherstellung |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0698481A1 EP0698481A1 (de) | 1996-02-28 |
EP0698481B1 true EP0698481B1 (de) | 1999-02-03 |
EP0698481B2 EP0698481B2 (de) | 2003-03-19 |
Family
ID=25925811
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94250211A Expired - Lifetime EP0698481B2 (de) | 1993-05-05 | 1994-08-24 | Fuzzysteuerungsverfahren zur Qualitätssicherung bei der Tablettenherstellung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0698481B2 (de) |
DE (2) | DE4315680C2 (de) |
ES (1) | ES2130350T5 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7136717B2 (en) | 2003-02-10 | 2006-11-14 | Korsch Ag | Method and device for the control of a rotary tablet forming machine |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19828004B4 (de) * | 1998-06-24 | 2005-10-13 | Korsch Ag | Verfahren zur Erzielung einer konstanten Preßkraft bei Tablettiermaschinen |
DE19955196A1 (de) * | 1999-11-16 | 2001-05-23 | Korsch Pressen Ag | Verfahren zum Konstanthalten der Bruchhärte von Tabletten |
DE19958999A1 (de) * | 1999-12-08 | 2001-04-26 | Henkel Kgaa | Verfahren und Vorrichtung zur Regelung von Tablettenpressen |
DE102006017196B4 (de) | 2006-04-12 | 2008-09-11 | Fette Gmbh | Verfahren zur Regelung der Wirkstoffmenge von Tabletten während der Produktion in einer Rundläufertablettenpresse |
CN101460297B (zh) | 2006-05-15 | 2012-10-10 | 库尔图瓦股份有限公司 | 用于控制压片机的方法及这种压片机 |
DE102009004620A1 (de) * | 2009-01-15 | 2010-07-22 | Gkn Sinter Metals Holding Gmbh | Verfahren zum Betrieb einer Pressvorrichtung zur Herstellung von Presslingen konstanter Höhe aus pulverförmigen Stoffen, Steuergerät für eine derartige Pressvorrichtung und Pressvorrichtung |
EP2427166B1 (de) | 2009-05-07 | 2013-10-16 | Gea Pharma Systems Limited | Tablettenproduktionsmodul und verfahren zur kontinuierlichen herstellung von tabletten |
DE102017004803A1 (de) * | 2017-05-18 | 2018-11-22 | Cosateq Gmbh | Verfahren zum Betrieb einer Pulverpresse mit Lagenregelung und Pulverpresse zur Ausführung des Verfahrens |
DE102018113220A1 (de) * | 2018-06-04 | 2019-12-05 | Thilo Kraemer | Verfahren zum automatischen Ermitteln von Grenzwerten von mindestens einem Parameter von kleinvolumigen Schüttgütern eines bestimmten Typs |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5085661A (de) * | 1973-11-30 | 1975-07-10 | ||
JPS61111799A (ja) * | 1984-11-02 | 1986-05-29 | Hata Tekkosho:Kk | ロ−タリ−式粉末圧縮成形機 |
DE3628757A1 (de) * | 1986-08-23 | 1988-03-03 | Fette Wilhelm Gmbh | Verfahren zur qualitaetssicherung bei der herstellung von tabletten |
FR2607441B1 (fr) * | 1986-12-02 | 1992-01-24 | Commissariat Energie Atomique | Installation de fabrication de comprimes de masse lineique constante |
-
1993
- 1993-05-05 DE DE4315680A patent/DE4315680C2/de not_active Expired - Fee Related
-
1994
- 1994-08-24 ES ES94250211T patent/ES2130350T5/es not_active Expired - Lifetime
- 1994-08-24 EP EP94250211A patent/EP0698481B2/de not_active Expired - Lifetime
- 1994-08-24 DE DE59407774T patent/DE59407774D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
Firmenprospekt"Fette die Präzision" PT3090 IC, Nov. 19990 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7136717B2 (en) | 2003-02-10 | 2006-11-14 | Korsch Ag | Method and device for the control of a rotary tablet forming machine |
Also Published As
Publication number | Publication date |
---|---|
DE4315680A1 (de) | 1994-11-10 |
EP0698481B2 (de) | 2003-03-19 |
DE4315680C2 (de) | 1996-02-29 |
EP0698481A1 (de) | 1996-02-28 |
ES2130350T5 (es) | 2003-11-16 |
ES2130350T3 (es) | 1999-07-01 |
DE59407774D1 (de) | 1999-03-18 |
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