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EP0842763B1 - Dispostif pour la pulvérisation contrôlée d'un produit de lubrification sous forme de poudre sur les poinçons et les matrices pour presses à comprimés - Google Patents

Dispostif pour la pulvérisation contrôlée d'un produit de lubrification sous forme de poudre sur les poinçons et les matrices pour presses à comprimés Download PDF

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Publication number
EP0842763B1
EP0842763B1 EP97119143A EP97119143A EP0842763B1 EP 0842763 B1 EP0842763 B1 EP 0842763B1 EP 97119143 A EP97119143 A EP 97119143A EP 97119143 A EP97119143 A EP 97119143A EP 0842763 B1 EP0842763 B1 EP 0842763B1
Authority
EP
European Patent Office
Prior art keywords
lubricant
sensor
output signal
pressing tools
suction
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
EP97119143A
Other languages
German (de)
English (en)
Other versions
EP0842763A3 (fr
EP0842763A2 (fr
Inventor
Guido Schmitz
Hans-Dieter Schmitz
Peter Dr. Kurka
Joachim Dr. Maasz
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.)
Bayer AG
Original Assignee
Bayer Healthcare AG
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 Bayer Healthcare AG filed Critical Bayer Healthcare AG
Publication of EP0842763A2 publication Critical patent/EP0842763A2/fr
Publication of EP0842763A3 publication Critical patent/EP0842763A3/fr
Application granted granted Critical
Publication of EP0842763B1 publication Critical patent/EP0842763B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/084—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to condition of liquid or other fluent material already sprayed on the target, e.g. coating thickness, weight or pattern
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/10—Arrangements for collecting, re-using or eliminating excess spraying material the excess material being particulate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0005—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for briquetting presses
    • B30B15/0011—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for briquetting presses lubricating means

Definitions

  • the present invention relates to a device for spraying powdered lubricants on punches and dies of tablet presses.
  • the literature describes lubricant systems that contain the lubricant both in liquid form (as a dispersion in alcoholic solvents) and Spray in powder form on the punches and matrices of tablet presses.
  • EP 262 538 describes a system that takes a lubricant from a reservoir transported to a nozzle via a pump.
  • the pump is here with the tablet machine synchronized.
  • the lubricant consists of an alcoholic lubricant dispersion, which for GMP reasons is more problematic than using the powdered lubricant.
  • EP 0 336 197 describes the targeted delivery of metered amounts of finely divided Solids described with a Venturi nozzle. It is from one discontinuous control for lubricant transport. It is also no regulation for the addition of lubricant is provided. Furthermore stand at this device the lubricant supply, the delivery system and the nozzle right next to the tablet press and, for GMP reasons, cannot be in one be moved to another room.
  • GB 2 053 787 A discloses a lubricant system in which the powdered lubricant on the surface of the lower tablet stamp is placed and after a short distance on the stamp orbit the Lubricant is swirled by the injection of air in such a way that it too Surface of the upper tablet stamp and the walls of the stamp guide are covered. Excess lubricant is sucked off.
  • the stamps are with a sensor connected, the amount of depending on the weight of a pressed tablet introduced lubricant controls.
  • No. 4,047,866 describes a lubricant system in which the lubricant then sprayed with an air stream onto the surface of the tablet stamp becomes when the output signal of a sensor connected to the stamp a reached certain value.
  • the sensor is a force sensor that is used for the measures the force required to eject the tablets from the punch.
  • the invention is an improvement on a device for Spraying the pressing tools in a tablet press with one in an air stream dispersed powdered lubricants or release agents.
  • This device exists from at least one spray nozzle for loading the pressing tools with the powder-containing air flow, a suction system for suctioning off the excess Lubricant residues on the pressing tools and a dosing device with one Air jet injector for the reproducible loading of the air flow with the lubricant.
  • the task is based on the lubricant supply to improve the tablet press in such a way that even with critical, Adequate lubrication of the pressing tools is always required for tablets that tend to stick with the powdered lubricant and by applying Operational faults caused by tabletting on the stamp surfaces are safe be avoided.
  • the pressing tools Tablet press are operatively connected to a sensor that is one for the Characterization of the pressing tool surfaces with the lubricant characteristic Output signal generated that controls the amount of air extracted from the suction system. It the amount of air extracted is adjusted in such a way that a sufficient Occupancy of the press tool surfaces with the lubricant is ensured. It is also possible and in many cases an advantage if a readjustment of the extracted air volume with an adjustment of the load of the air flow is combined. This special feedback makes it independent of Operating state a needs-based, reproducibly adjustable, optimal Lubrication of the pressing tools guaranteed.
  • the sensor is e.g. a force sensor suitable for the one to eject the Tablets required force from the pressing tools characteristic output signal generated.
  • a sensor which consists of an optical reflection sensor to detect the reflected on the surface of the pressing tools Light exists.
  • the effect of this optical sensor is based on the fact that at a less coating of the stamp surfaces with the powdered lubricant Light is reflected, so that the sensor signal decreases.
  • the senor is connected to a control circuit which, when the sensor output signal changes, adjusts the suction power of the suction system and thus the occupancy of the press tool surfaces with the lubricant in such a way that the deviation of the sensor output signal from a preset one Setpoint S 0 or K 0 is minimized.
  • the suction power of the suction system is therefore used as a manipulated variable to readjust the lubricant occupancy and thus the intensity and effectiveness of the lubrication. With a lower suction, a larger proportion of lubricant adheres to the press ram surfaces. With a stronger suction, however, more powder is sucked off, so that the occupancy is lower.
  • the control is carried out in such a way that the force sensor causes the suction system to reduce the suction power when the output signal increases up to a limit value K 1 .
  • a reflection sensor is preferably used as a sensor for the assignment.
  • the regulation is carried out so that the reflection sensor causes the suction system to increase the suction power when its output signal decreases up to a limit value S 1 .
  • a further development of the invention is characterized in that the output signal of the force sensor when the limit value K 1 is exceeded or the output signal of the reflection sensor when the limit value S 1 is undershot causes the metering device to meter in more lubricant into the air stream flowing to the spray nozzle until the limit value K 1 again falls below or the limit value S 1 is exceeded again.
  • the product tablette material
  • the sensor signals a further increased tablet ejection force or (in the case of the optical sensor) a further reduced reflection despite the reduction in the lubricant suction.
  • the even greater intensification of the lubrication required in this case can obviously no longer be achieved here by further reducing the lubricant suction.
  • a return to the normal control state is then only possible with a stronger loading of the air flow with the powdered lubricant.
  • the stronger load is therefore introduced as an auxiliary manipulated variable when the adjustment of the suction power is no longer sufficient to trace the controlled variable, ie the sensor signal characteristic of the lubrication of the press tools, to the setpoint. As already mentioned, experience has shown that this occurs when product settles on the surfaces of the pressing tools.
  • Another important improvement of the invention is that the spray nozzle for the application of the lubricant to the pressing tools together with the suction device to remove the excess lubricant in the filling shoe the tablet press is installed. If necessary, it can also be used for removal of the ejected tablets wipers also attached to the filling shoe become.
  • This integrated space-saving design has the advantage that existing ones Tablet presses easily retrofitted with the new lubricant system can be.
  • the dosing device for feeding the powdered lubricant into the Conveying air flow generated with an injector suitably consists of a Stirrer arms and a vertically positioned storage container, which has a discharge opening on its bottom.
  • an injector suitably consists of a Stirrer arms and a vertically positioned storage container, which has a discharge opening on its bottom.
  • For further transport of the discharged Powder in the air jet injector advantageously serves one below the discharge opening of the storage container arranged vibratory conveyor trough (vibrating trough).
  • the powdered lubricant e.g. Magnesium stearate
  • a cylindrical storage container 1 In the storage container 1 an agitator 2 with a basket-like agitator 3 and agitator blades 4 is installed. The agitator 2 is driven by a speed-controlled motor 5. The revolving agitator 2 continuously loosens the lubricant in the container and trickles through the outlet opening 6 (see FIG. Fig. 3) on the bottom of the storage container 1 attached to a below the storage container Vibrating trough 7 (vibrating conveyor) leading to the filling opening 8 of an air jet injector 9 leads. The air jet injector 9 is connected to a compressed air source via a valve 10 connected.
  • the powdered lubricant is in the Air jet injector 9 sucked in and through a hose 12 that is several meters long can be built into the filling shoe 13 of a rotary tablet press Spray nozzle 14 promoted (see. Fig. 2).
  • the slit-shaped spray nozzle 14 divides the air jet charged with the lubricant in the direction of upper punch 15a and lower punch 15b of the tablet press. With the help of this nozzle construction it is possible to use upper and lower stamps Spray the die of the tablet press with the lubricant. Also in the A filling device 16 is installed to remove the excess, lubricant not adhering to the press tool surfaces. It consists of one arranged in the direction of the press ram behind the spray nozzle 14, also Integrated, conically expanded suction opening in the filling shoe, which with a Suction line 17 is connected (see FIG. 1). Furthermore, here is the one to redirect Ejection chute required tablet wipers 18 to save space the filling shoe 13 attached and not, as usual, directly on the Tablet press.
  • the suction line 17 is via a control valve 19 with a suction pump 20 connected.
  • the suction power at the Suction opening 16 can be varied. It has been found that the suction power is suitable
  • the manipulated variable represents the assignment of the press ram surfaces with the Control lubricant. The occupancy increases with decreasing suction power and conversely, with increasing suction power.
  • the coating of the press ram surfaces with the lubricant is done with the help a reflection sensor 21 measured, behind the tablet stamp in the running direction the suction device 16 to the side of the passing stamp on the tablet press is appropriate.
  • the reflection sensor 21 is a commercially available one Component in which the primary light and the measuring light are fed in or out through light guides becomes.
  • the measuring light is photoelectrically converted into an electrical measuring signal converted, which is inversely proportional to the occupancy of the lubricant is. The greater the occupancy, the lower the intensity of the stamp surface reflected light and the smaller the size of the measurement signal.
  • the Measuring signal is amplified (measuring amplifier 22) and a control unit 23 fed, whose function is described below:
  • the control unit 23 comprises an input for the measuring line 24 and four outputs for control lines.
  • the control line 25 is connected to the metering device 2, the control line 26 to the vibrating trough 7, the control line 27 to the air jet injector valve 10 and the control line 28 to the control valve 19 in the suction line 17.
  • the normal operating state of the control unit 23 is characterized in that when the measurement signal at the reflection sensor 21 decreases, which corresponds to an increase in the coating of the stamp surface with lubricant, the suction power at the suction opening 16 is increased in that the control valve 19 via the control line 28 further opened and vice versa when the reflection signal increases (corresponding to a decrease in the lubricant occupancy) to reduce the suction power more closed.
  • a low lubrication leads to a large measured value
  • a strong lubrication leads to a small measured value.
  • the valve 19 and thus the suction power is now adjusted by the control unit 23 so that the lubricant occupancy of the pressing tools is kept at a predetermined target value S 0 , or the deviation from this target value is minimized.
  • the speed of the metering motor 5 and thus also the amount of lubricant metered into the air jet injector 9 is increased until the product build-up on the stamps disappears via the control line 25.
  • the measured value then again exceeds the limit value S 1 , so that the control can be returned to the normal control range, in which the suction power is again used as a control variable for the lubricant occupancy.
  • the oscillation frequency of the vibrating trough 7 (via the control line 26) and the flow rate of the conveying air into the air jet injector 9 (via the valve 10 and the control line 27) can be adjusted by the control unit 23 when the lubricant is metered in at an increased rate.
  • a force sensor can also be used, which measures the force (ejection force) required to eject the finished tablets from the die of the tablet press.
  • force sensors are already installed in most commercially available tablet presses. This makes use of the functional connection that the ejection force decreases with increasing lubricant occupancy and increases with decreasing lubricant occupancy.
  • the measured ejection force is compared with a preselected setpoint K 0 and the suction power is adjusted so that the deviation from this setpoint is again as small as possible.
  • the option of increasing the powder load in the conveying air flow can be used if experience shows that after a limit value K 1 for the ejection force is exceeded, the change in suction power in the case of product build-up on the stamp surfaces is no longer sufficient, the originally set target value K 0 for regulate the ejection force.
  • a variant of the invention is that not the suction on the ram is used as a manipulated variable to determine the lubricant occupancy of the ram surfaces readjust, but from the outset the powder loading of the injector airflow.
  • the suction power is kept constant and only that Dosing rate for the dosing of the lubricant into the injector air flow and if necessary also adjusted the amount of injector air so that the difference between the actual value measured with the force sensor or reflection sensor Lubricant occupancy and the setpoint Ko or So brought to zero (minimized) becomes.
  • this type of control may have a higher lubricant consumption result.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Medical Preparation Storing Or Oral Administration Devices (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Forging (AREA)
  • Nozzles (AREA)
  • Medicinal Preparation (AREA)
  • Spray Control Apparatus (AREA)

Claims (11)

  1. Dispositif pour la pulvérisation sur des outils de compression dans une presse à comprimés d'un produit de lubrification ou d'un agent de séparation sous forme de poudre et dispersé dans un courant d'air,
    comprenant au moins une buse de pulvérisation (14) pour l'alimentation des outils de compression avec le courant d'air contenant de la poudre,
    un dispositif de dosage (1, 2, 3, 4, 5, 6) avec un injecteur de jet d'air pour le chargement reproductible du courant d'air avec le produit de lubrification,
    un capteur (21), avec lequel les outils de compression (15a, 15b) de la presse à comprimés sont en liaison active,
    et qui génère un signal de sortie caractéristique de l'occupation des surfaces d'outils de compression avec le produit de lubrification,
    caractérisé en ce que
    le dispositif présente un système d'aspiration (16, 19, 20) pour l'évacuation par aspiration des restes excédentaires de produit de lubrification sur les outils de compression, et
    le signal de sortie caractéristique commande la quantité d'air évacuée par aspiration sur le système d'aspiration (16, 19, 20).
  2. Dispositif selon la revendication 1, caractérisé en ce que le signal de sortie caractéristique contrôle également le chargement du courant d'air avec la poudre.
  3. Dispositif selon les revendications 1 ou 2, caractérisé en ce que le capteur est constitué d'un capteur dynamométrique qui génère un signal de sortie caractéristique pour la force nécessaire pour l'éjection des comprimés sur les outils de compression.
  4. Dispositif selon la revendication 1 ou 2, caractérisé en ce que le capteur se compose d'un capteur de réflexion optique (21) pour la détection de la lumière réfléchie sur la surface des outils de compression.
  5. Dispositif selon la revendication 3 ou 4, caractérisé en ce que le capteur (21) est relié à un circuit régulateur (16, 17, 19, 23) qui, lors d'une variation du signal de sortie du capteur, règle la puissance d'évacuation du système d'aspiration (16, 19, 20) et donc l'occupation des surfaces d'outils de compression avec le produit de lubrification de telle façon que l'écart entre le signal de sortie du capteur et une valeur de consigne prédéfinie soit réduit au minimum.
  6. Dispositif selon la revendication 5, caractérisé en ce que le capteur de force déclenche le système d'aspiration pour réduire la puissance d'évacuation lors d'une augmentation du signal de sortie jusqu'à une valeur K1.
  7. Dispositif selon la revendication 5, caractérisé en ce que le capteur de réflexion (21) déclenche le système d'aspiration (16, 19, 20) pour élever la puissance d'évacuation lors d'une diminution de son signal de sortie jusqu'à une valeur limite S1.
  8. Dispositif selon la revendication 6 ou 7, caractérisé en ce que le signal de sortie du capteur de force dans le cas d'un dépassement de la valeur limite K1 ou le signal de sortie du capteur de réflexion (21) dans le cas d'un sous-dépassement de la valeur limite S1, déclenche le système de dosage (1, 2, 3, 4, 5, 6) pour une entrée dosée augmentée du produit de lubrification dans le courant d'air, jusqu'à repasser au-dessous de la valeur limite K1 ou au-dessus de la valeur limite S1.
  9. Dispositif selon les revendications 1 à 8, caractérisé en ce qu'il est prévu en supplément un dispositif de réglage qui maintient constant le débit de dosage pour le chargement du courant d'air.
  10. Dispositif selon les revendications 1 à 9, caractérisé en ce que la buse de pulvérisation (14) pour l'alimentation des outils de compression (15a, 15b) avec le produit de lubrification est montée conjointement avec un racleur (18) pour les comprimés et un dispositif d'évacuation par aspiration (16) pour l'enlèvement de l'excédent de produit de lubrification dans le sabot de remplissage de la presse à comprimés.
  11. Dispositif selon les revendications 1 à 10, caractérisé en ce que le dispositif de dosage comprend un réservoir de stockage (1) pourvu de bras mélangeur (4) et d'un panier mélangeur (3), qui est installé verticalement, et présente un orifice d'évacuation (6) sur son fond et en ce qu'au-dessous de l'orifice d'évacuation (6) est disposée une goulotte vibrante (7) pour le transport du produit de lubrification pulvérulent sortant goutte à goutte du réservoir de stockage (1) dans l'injecteur de jet d'air (9).
EP97119143A 1996-11-14 1997-11-03 Dispostif pour la pulvérisation contrôlée d'un produit de lubrification sous forme de poudre sur les poinçons et les matrices pour presses à comprimés Expired - Lifetime EP0842763B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19647089 1996-11-14
DE19647089A DE19647089A1 (de) 1996-11-14 1996-11-14 Vorrichtung zum kontrollierten Aufsprühen von pulverförmigen Schmiermitteln auf Stempel und Matrizen von Tablettenpressen

Publications (3)

Publication Number Publication Date
EP0842763A2 EP0842763A2 (fr) 1998-05-20
EP0842763A3 EP0842763A3 (fr) 1998-07-22
EP0842763B1 true EP0842763B1 (fr) 2004-05-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97119143A Expired - Lifetime EP0842763B1 (fr) 1996-11-14 1997-11-03 Dispostif pour la pulvérisation contrôlée d'un produit de lubrification sous forme de poudre sur les poinçons et les matrices pour presses à comprimés

Country Status (8)

Country Link
US (1) US6079968A (fr)
EP (1) EP0842763B1 (fr)
AT (1) ATE267692T1 (fr)
CA (1) CA2220476C (fr)
DE (2) DE19647089A1 (fr)
DK (1) DK0842763T3 (fr)
ES (1) ES2221007T3 (fr)
PT (1) PT842763E (fr)

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JPH0810472Y2 (ja) * 1990-08-31 1996-03-29 塩野義製薬株式会社 回転式粉末圧縮成形機
DE4030539A1 (de) * 1990-09-27 1992-04-16 Dilthey Ulrich Prof Dr Ing Pulverdosiervorrichtung fuer einen brenner zum thermischen beschichten eines grundwerkstoffs mit einem pulverfoermigen zusatzwerkstoff
US5365577A (en) * 1990-09-27 1994-11-15 Radish Communications Systems, Inc. Telecommunication display system
DE4203273A1 (de) * 1991-02-05 1992-08-27 Voss Gunter M Vorrichtung zur beschichtung einer presskammer mit einem schmiermittel
DE4103413C1 (fr) * 1991-02-05 1992-11-12 Gunter M. 8918 Diessen De Voss
JP2681601B2 (ja) * 1993-11-01 1997-11-26 協和醗酵工業株式会社 外部滑沢式打錠機
DE4412117A1 (de) * 1994-04-08 1995-10-12 Fette Wilhelm Gmbh Verfahren und Vorrichtung zum Aufbringen von pulverförmigem Schmier- oder Trennmittel auf die Preßwerkzeuge in Tablettiermaschinen
DE19511272A1 (de) * 1995-03-27 1996-10-02 Acheson Ind Deutschland Zweign Zweistoff-Sprühdüse, insbesondere für ein Sprühelement eines Sprühwerkzeugs einer Formsprüheinrichtung, und Düsenwechselanordnung für Zweistoff-Sprühdüsen

Also Published As

Publication number Publication date
EP0842763A3 (fr) 1998-07-22
PT842763E (pt) 2004-09-30
EP0842763A2 (fr) 1998-05-20
ES2221007T3 (es) 2004-12-16
DE19647089A1 (de) 1998-05-28
DE59711664D1 (de) 2004-07-01
CA2220476C (fr) 2007-01-09
DK0842763T3 (da) 2004-08-16
US6079968A (en) 2000-06-27
CA2220476A1 (fr) 1998-05-14
ATE267692T1 (de) 2004-06-15

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