EP0842763A2 - 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
EP0842763A2
EP0842763A2 EP97119143A EP97119143A EP0842763A2 EP 0842763 A2 EP0842763 A2 EP 0842763A2 EP 97119143 A EP97119143 A EP 97119143A EP 97119143 A EP97119143 A EP 97119143A EP 0842763 A2 EP0842763 A2 EP 0842763A2
Authority
EP
European Patent Office
Prior art keywords
lubricant
sensor
output signal
suction
pressing tools
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
EP97119143A
Other languages
German (de)
English (en)
Other versions
EP0842763B1 (fr
EP0842763A3 (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 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 AG filed Critical Bayer 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 powdery Lubricants on punches and dies in tablet presses.
  • lubricant systems describe both the lubricant in liquid form (as a dispersion in alcoholic solvents) and in powder form Spray on stamps and dies 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 the use of powder Lubricant.
  • EP 0 336 197 describes the targeted delivery of metered amounts of finely divided solids described with a Venturi nozzle. This is done by a discontinuous Control for the lubricant transport made use of. It is also not a regulation intended for the addition of lubricant. Furthermore, in this device Lubricant supply, the delivery system and the nozzle right next to the tablet press and cannot be moved to another room for GMP reasons.
  • 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 to Adequate lubrication of the pressing tools is always required for tablets that tend to stick with the powdered lubricant and by attaching Operational disruptions caused by tabletting on the stamp surfaces are reliably avoided will.
  • the pressing tools Tablet press with a sensor in a swirling connection one for occupancy the pressing tool surfaces with the lubricant characteristic output signal Generates the amount of air extracted from the suction system and / or the load of the air flow with the powder controls. So either the amount of air extracted or the loading of the air flow with the powder is adjusted in such a way that a sufficient Allocation of the press tool surfaces with the lubricant ensured is. But it is also possible and in many cases an advantage if both types the adjustment can be combined. Through this special feedback becomes a reproducible, needs-based regardless of the operating state adjustable, optimal lubrication of the pressing tools guaranteed.
  • a force sensor for example, a force sensor is suitable, one for ejecting the Tablets from the pressing tools required force 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 dies.
  • the effect of this optical sensor is based on the fact that at a stronger coating of the stamp surfaces with the powdered lubricant less 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 measuring 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 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.
  • 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, the can also be transported of the ejected tablets wipers also attached to the filling shoe will.
  • 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 consists of two with a Mixing arms and a vertically positioned storage container provided with a mixing basket, which has a discharge opening on its bottom.
  • a mixing basket 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 is installed with a basket-like agitator 3 and agitator blades 4. The agitator 2 is driven by a speed-controlled motor 5. The revolving agitator 2 constantly 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 which is several meters long can be built into a 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 tablet press die with the lubricant. Also in the Filling shoe is built in a suction device 16 sur removal of 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, the only one Suction line 17 is connected (see FIG. 1).
  • Next bin is the one to redirect into one Ejection chute required tablet wipers 18 to save space the filler 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 occupancy of the press ram surface 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 smaller the intensity of the stamp surface reflected light and the smaller the size of the measurement signal.
  • the measurement signal is amplified (measurement 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 continues via the control line 28 opened and vice versa is closed more with an increase in the reflection signal (corresponding to a decrease in the lubricant occupancy) to reduce the suction power.
  • 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 so far via the control line 25 until the product on the stamps disappears.
  • 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 volume flow 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. In this case, use is made of the functional connection that the ejection force decreases with increasing lubricant occupancy and increases with decreasing lubricant occupancy. Analogous to the pre-freezing control based on the reflection sensor, 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 the suction on the press rams is not used as a manipulated variable to readjust the lubricant occupancy of the press ram surfaces, but rather the powder loading of the injector air flow from the outset.
  • the suction power is kept constant and only the metering rate for the metering of the lubricant into the injector air flow and possibly also the amount of injector air is adjusted in such a way that the difference between the actual value of the lubricant occupancy measured with the force sensor or reflection sensor and the setpoint K 0 or S 0 is brought to zero (minimized).
  • this type of control may result in a greater consumption of lubricant.

Landscapes

  • 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)
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 true EP0842763A2 (fr) 1998-05-20
EP0842763A3 EP0842763A3 (fr) 1998-07-22
EP0842763B1 EP0842763B1 (fr) 2004-05-26

Family

ID=7811670

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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3505341A1 (fr) * 2017-12-25 2019-07-03 Kikusui Seisakusho Ltd. Organe de commande et procédé de commande

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FR2790387B1 (fr) * 1999-03-01 2001-05-18 Prographarm Laboratoires Comprime orodispersible presentant une faible friabilite et son procede de preparation
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WO2006060906A1 (fr) * 2004-12-06 2006-06-15 Corporation Imfine Inc. Dispositif et procede pour lubrifier la surface de paroi d'une empreinte
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CN105383085A (zh) * 2015-12-13 2016-03-09 秦皇岛博赫科技开发有限公司 模拟多元药物粉体压缩过程的压片机
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CN109591354A (zh) * 2018-12-26 2019-04-09 贵州大学 一种用于药品工业中的压片机械
CN109701783A (zh) * 2018-12-28 2019-05-03 唐山晶源电子有限公司 镜面磁芯外包封喷涂装置
CN114887792A (zh) * 2022-05-05 2022-08-12 青岛华仕达机器股份有限公司 一种制备钢用管喷涂缠绕式布线装置

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3505341A1 (fr) * 2017-12-25 2019-07-03 Kikusui Seisakusho Ltd. Organe de commande et procédé de commande
US10583590B2 (en) 2017-12-25 2020-03-10 Kikusui Seisakusho Ltd. Controller and control method

Also Published As

Publication number Publication date
ES2221007T3 (es) 2004-12-16
DE59711664D1 (de) 2004-07-01
EP0842763B1 (fr) 2004-05-26
US6079968A (en) 2000-06-27
ATE267692T1 (de) 2004-06-15
PT842763E (pt) 2004-09-30
DE19647089A1 (de) 1998-05-28
EP0842763A3 (fr) 1998-07-22
CA2220476A1 (fr) 1998-05-14
DK0842763T3 (da) 2004-08-16
CA2220476C (fr) 2007-01-09

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