EP0204266A1 - Presse à tablettes - Google Patents

Presse à tablettes Download PDF

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Publication number
EP0204266A1
EP0204266A1 EP86107315A EP86107315A EP0204266A1 EP 0204266 A1 EP0204266 A1 EP 0204266A1 EP 86107315 A EP86107315 A EP 86107315A EP 86107315 A EP86107315 A EP 86107315A EP 0204266 A1 EP0204266 A1 EP 0204266A1
Authority
EP
European Patent Office
Prior art keywords
pressure rollers
main pressure
pressing force
main
die plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86107315A
Other languages
German (de)
English (en)
Other versions
EP0204266B1 (fr
Inventor
Jürgen Hinzpeter
Ingo Schmidt
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 EP0204266A1 publication Critical patent/EP0204266A1/fr
Application granted granted Critical
Publication of EP0204266B1 publication Critical patent/EP0204266B1/fr
Expired legal-status Critical Current

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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
    • B30B11/02—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
    • 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 rotary tableting machine for compacting powdery or granular pressed material, which has a rotatable die plate and matrices distributed over the circumference, as well as upper and lower punches arranged above and below the die plate, with which the pressed material is turned into tablets by means of adjustable pre-printing is press, in which a main pressure roller is provided with a servomotor controlled by a computer, with which the distance between the main pressure rollers can be changed from one another.
  • Rotary tableting machines of this type are used for the production of compacts from the most varied of materials, that is to say not only for the production of tablets from medicaments which are intended for human consumption are determined, but also of compacts, for example made of plastic or a metal powder or a ceramic mass.
  • the individual tablets are produced by compressing the powdery molding compound in a die of a rotating die between an upper punch and a lower punch.
  • the force for compressing the molding compound at the main printing station is generated in that the upper punch and the lower punch are passed between main pressure rollers, the distance between which can be changed by an actuator in order to be able to specify the size of the main pressing force. (DT-OS 31 31 402).
  • the molding compound is pre-compressed at a pre-printing station using a pre-pressing force before the main printing station.
  • This pre-pressing force is usually considerably less than the main pressing force.
  • the pre-pressing force is 10 kN (Kilo Newton) and the main pressing force is 40 kN.
  • the main pressing forces required to manufacture tablets are so high that they are close to the permissible load limit of the punches lying for pressing. Due to malfunctions such as double fillings, the limit of the permissible load of a main press ram can be exceeded, causing the ram to compress or break. In order to counter this, it is known to provide overpressure safeguards that are preloaded hydraulically or with springs.
  • the object of the present invention is to provide a tabletting machine and a method for controlling its pressure rollers, which reduces the risk of stamp breaks occurring at the main pressing station.
  • a computer controls the servomotor for the distance between the main pressure rollers based on the measured pressing force of the pre-pressure rollers.
  • the pre-pressing force of each punch is thus measured and evaluated at the pre-printing station. Even if this pre-pressing force is considerably lower than the main pressing force at the main pressure station, its size allows a conclusion to be drawn about the size of the main pressing force to be expected. As a result, it can already be recognized from the size of the pre-pressing force whether the pressing force at the main printing station will exceed the permissible punch load.
  • a limit is set for the pre-pressing force when exceeded by the Maximum of the pre-pressing force, the press is stopped suddenly, so that the pre-pressed tablet in question with its associated punches does not reach the main pressure rollers.
  • These are automatically moved apart by a certain size at the same time or after the die plate is shut down, so that the stamps with the excessive pre-pressing force can be passed through in a computer-controlled manner without excessive main pressing force and without the risk of damage between the main pressure rollers which have moved apart.
  • the tabletting machine is then stopped again in order to avoid an ejection of too many bad tablets, which would occur when the main pressure rollers were reset to the originally intended distance. Once this provision has been made, the tablets will continue to be manufactured automatically.
  • the main pressure rollers are preferably mounted in supports whose spacing can be adjusted by the servomotor.
  • the servomotor is coupled in a gear-like manner to a length-adjustable rod which is connected to the carriers of the main pressure rollers, the main pressure rollers being able to be mounted in a parallelogram-type pressure frame.
  • the control of the servomotor for the main pressure rollers and the drive motor for the die plate is preferably carried out using a microprocessor which is connected to strain gauges with which the pre-pressing forces of the pre-pressure rollers can be measured in a known manner.
  • the rotary tablet machine shown in the drawing has a die plate 1 rotating around the arrow 7, which is provided with dies 2, which are arranged evenly distributed over the circumference.
  • the matrices 2 are filled at a filling station 3 with material to be pressed, which is pre-pressed at a pre-printing station 4 using the pre-pressure rollers 11 and 12 (FIG. 2). These pre-pressure rollers 11 and 12 act on the upper punch 9 and lower punch 10 associated with each die for pre-pressing a tablet 8.
  • the final pressing of the material to be pressed 13 takes place at the main printing station 5 using the main pressure rollers 14 and 15.
  • the main pressure rollers 14 and 15 are mounted in a printing frame which, in the exemplary embodiment shown in FIG. 2, consists of two carriers 16 and 17, which are connected by a rod 18.
  • a servomotor M 1 which is provided with a gear.
  • the servomotor M 1 acts on a spindle 22 which is in engagement with a worm wheel 21.
  • This worm wheel 21 sits on a threaded spindle 20 which is seated with its end sections in threaded sleeves 23 and 24.
  • the spindle 22 rotates the worm wheel 21 and thus the spindle 20.
  • the two end sections of the rod 18 are adjusted to one another or away from one another in accordance with the double arrow 19, so that the distance between the main pressure rollers 14 and 15 is also adjusted.
  • the mutual distance between the main pressure rollers 14 and 15 is increased by actuating the servomotor M 1 when a predetermined pre-pressing force limit is exceeded in accordance with the following illustration.
  • the form rollers 11 and 12 are held in a known - and not shown in the drawing - type of a carrier, which is provided with strain gauges with which the deflection of the carrier, which is dependent on the pre-pressing force of the form rollers 11 and 12 and the Stamp 9 and 10, measure and convert to voltage signals which are proportional to the pre-pressure.
  • the strain gauges are based on the principle a full bridge or a Wheatstone bridge, as shown in FIG. 3.
  • the change in voltage that occurs in the stretch marks or bridge 25 during pressing is amplified via an amplifier 26 to a microprocessor 27.
  • the signals are evaluated taking into account the predetermined pressing force limits and when a pre-pressing force limit is exceeded, a signal is sent to the servomotor M 1 for adjusting the main pressure rollers 14 and 15 and to the main drive motor M 2 of the die plate 1 for stopping its circulation.
  • the pre-pressing force V is regularly smaller than the main pressing force H.
  • the main pressing force H must be prevented from exceeding a predetermined pressing force quantity B, since then there is a risk of a stamp break. Therefore the size of the pre-compression force V is taken into account. If the pre-pressing force V is below a predetermined pre-pressing force quantity A, it can be assumed that the subsequent main pressing force H 1 is also below the tolerance limit B. However, if the pre-pressing force V 2 exceeds the predetermined limit A, it must be expected that the subsequent main pressing force H 2 will also exceed the tolerance limit B. In order to prevent this, according to the invention, when the adjustable size A is exceeded by the pre-pressing force V 3, the machine is stopped and the main pressure rollers are moved apart, so that subsequently a main pressing force H 3 to be measured is far below the tolerance limit B.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Medical Preparation Storing Or Oral Administration Devices (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Press Drives And Press Lines (AREA)
EP86107315A 1985-06-05 1986-05-30 Presse à tablettes Expired EP0204266B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853520203 DE3520203A1 (de) 1985-06-05 1985-06-05 Rundlaeufer-tablettiermaschine und verfahren zur steuerung ihrer druckrollen
DE3520203 1985-06-05

Publications (2)

Publication Number Publication Date
EP0204266A1 true EP0204266A1 (fr) 1986-12-10
EP0204266B1 EP0204266B1 (fr) 1988-10-12

Family

ID=6272539

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86107315A Expired EP0204266B1 (fr) 1985-06-05 1986-05-30 Presse à tablettes

Country Status (3)

Country Link
US (1) US4680158A (fr)
EP (1) EP0204266B1 (fr)
DE (2) DE3520203A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995028268A1 (fr) * 1994-04-19 1995-10-26 H-C Industries, Inc. Procede de detection des surcharges de la came d'un appareil de moulage de plastiques
US5838571A (en) * 1996-01-29 1998-11-17 Alza Corporation Tablet press monitoring and controlling method and apparatus
DE19955196A1 (de) * 1999-11-16 2001-05-23 Korsch Pressen Ag Verfahren zum Konstanthalten der Bruchhärte von Tabletten
DE19828004B4 (de) * 1998-06-24 2005-10-13 Korsch Ag Verfahren zur Erzielung einer konstanten Preßkraft bei Tablettiermaschinen
CN110920128A (zh) * 2019-12-16 2020-03-27 湖北工业大学 一种粉末高速压片机

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3823417A1 (de) * 1988-07-11 1990-01-18 Fette Wilhelm Gmbh Verfahren und einrichtung zum ueberwachen der presskraefte der stempel einer tablettenpresse
US5211964A (en) * 1991-05-20 1993-05-18 Westinghouse Electric Corp. Press machine with means to adjust punching force
JPH0780076B2 (ja) * 1992-04-28 1995-08-30 株式会社菊水製作所 回転式錠剤機の取着ロードセル点検方法
FI92145C (fi) * 1993-01-28 1994-10-10 Tensor Oy Menetelmä ja laitteisto tabletin puristamisen simuloimiseksi
US5401156A (en) * 1993-12-08 1995-03-28 Carruthers Equipment Co. Machine for inserting a sized portion of a food product into a container
DE19502596C2 (de) * 1995-01-28 1997-08-28 Fette Wilhelm Gmbh Meßgerät und Rechner zur Überprüfung der auf einer Rundläuferpresse hergestellten Tabletten der laufenden Produktion
US6106262A (en) 1997-12-25 2000-08-22 Metropolitan Computing Corporation Press simulation apparatus
DE10135283C2 (de) * 2001-07-19 2003-09-18 Fette Wilhelm Gmbh Verfahren zum Verpressen von Pulvermaterial
US20050200038A1 (en) 2004-03-12 2005-09-15 Courtoy Nv Method for controlling a rotary tablet press and such a press
DE102005007790B4 (de) 2005-02-19 2007-06-28 Fette Gmbh Verfahren und Vorrichtung zur Versuchspressung von Mehrschichttabletten oder Manteltabletten
WO2008016183A1 (fr) * 2006-08-04 2008-02-07 Brother Kogyo Kabushiki Kaisha Appareil de formation d'image
DE102011101286B4 (de) 2011-05-10 2013-10-17 Fette Compacting Gmbh Rundläuferpresse und Verfahren zum Betreiben einer Rundläuferpresse

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2029094A1 (de) * 1969-06-12 1970-12-23 Shionogi & Co. Ltd., Osaka (Japan) Mit Stempeln und Matrizen arbeitende, drehbare Preßformvorrichtung
DE2251832B2 (de) * 1971-11-16 1976-11-25 The Upjohn Co., Kalamazoo, Mich. (V.StA.) Steuerung einer drehtisch-tablettenpresse mit presskraftregelung
DD146113A1 (de) * 1979-09-13 1981-01-21 Ralf Kurz Verfahren zur erzeugung und steuerung eines anlagenleitwertes
CH633958A5 (de) * 1977-09-22 1983-01-14 Fette Wilhelm Gmbh Verfahren und vorrichtung zum erstellen von belegen ueber die herstellung von tabletten.
DE3131402A1 (de) * 1981-08-07 1983-02-24 Kilian & Co GmbH, 5000 Köln Verfahren und tablettenpresse zum aufeinanderfolgenden herstellen einer vielzahl von tabletten mit gleichem gewicht

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE305018C (fr) *
US1757370A (en) * 1926-07-28 1930-05-06 Kilian Fritz Apparatus for pressing pulverulent substances into boxes
DE2520662C3 (de) * 1975-05-09 1983-11-03 Wilhelm Fette Gmbh, 2053 Schwarzenbek Einrichtung zum Überwachen der Preßkräfte der Stempel einer Tablettenpresse
US4030868A (en) * 1976-03-15 1977-06-21 Hoffmann-La Roche Inc. Force measurement and analysis particularly relating to rotary tablet presses
JPS5614098A (en) * 1979-07-13 1981-02-10 Takeda Chem Ind Ltd Externally lubricating tablet making machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2029094A1 (de) * 1969-06-12 1970-12-23 Shionogi & Co. Ltd., Osaka (Japan) Mit Stempeln und Matrizen arbeitende, drehbare Preßformvorrichtung
DE2251832B2 (de) * 1971-11-16 1976-11-25 The Upjohn Co., Kalamazoo, Mich. (V.StA.) Steuerung einer drehtisch-tablettenpresse mit presskraftregelung
CH633958A5 (de) * 1977-09-22 1983-01-14 Fette Wilhelm Gmbh Verfahren und vorrichtung zum erstellen von belegen ueber die herstellung von tabletten.
DD146113A1 (de) * 1979-09-13 1981-01-21 Ralf Kurz Verfahren zur erzeugung und steuerung eines anlagenleitwertes
DE3131402A1 (de) * 1981-08-07 1983-02-24 Kilian & Co GmbH, 5000 Köln Verfahren und tablettenpresse zum aufeinanderfolgenden herstellen einer vielzahl von tabletten mit gleichem gewicht

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995028268A1 (fr) * 1994-04-19 1995-10-26 H-C Industries, Inc. Procede de detection des surcharges de la came d'un appareil de moulage de plastiques
US5838571A (en) * 1996-01-29 1998-11-17 Alza Corporation Tablet press monitoring and controlling method and apparatus
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
CN110920128A (zh) * 2019-12-16 2020-03-27 湖北工业大学 一种粉末高速压片机
CN110920128B (zh) * 2019-12-16 2021-08-24 湖北工业大学 一种粉末高速压片机

Also Published As

Publication number Publication date
US4680158A (en) 1987-07-14
DE3520203A1 (de) 1986-12-11
EP0204266B1 (fr) 1988-10-12
DE3660887D1 (en) 1988-11-17

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