EP0379912A2 - Procédé pour revêtir les outils de formage dans des machines de fabrication de tablettes - Google Patents

Procédé pour revêtir les outils de formage dans des machines de fabrication de tablettes Download PDF

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Publication number
EP0379912A2
EP0379912A2 EP90100669A EP90100669A EP0379912A2 EP 0379912 A2 EP0379912 A2 EP 0379912A2 EP 90100669 A EP90100669 A EP 90100669A EP 90100669 A EP90100669 A EP 90100669A EP 0379912 A2 EP0379912 A2 EP 0379912A2
Authority
EP
European Patent Office
Prior art keywords
nozzle
gas
lubricant
air
pulse
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.)
Withdrawn
Application number
EP90100669A
Other languages
German (de)
English (en)
Other versions
EP0379912A3 (fr
Inventor
Gunther M. Voss
Volker Ingo Dr.-Dipl.-Chem. Gläsel
Peter Dr.-Dipl.-Chem. Gruber
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.)
Boehringer Ingelheim Pharma GmbH and Co KG
Original Assignee
Dr Karl Thomae 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 Dr Karl Thomae GmbH filed Critical Dr Karl Thomae GmbH
Publication of EP0379912A2 publication Critical patent/EP0379912A2/fr
Publication of EP0379912A3 publication Critical patent/EP0379912A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/06—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with a blast of gas or vapour

Definitions

  • the invention relates to a method for the intermittent coating of molds, primarily in tableting machines, by means of discrete droplets of liquid or suspended lubricants, as well as lubricant melts, the main part of which is to apply a lubricant ring to the die walls for the production of moldings in the pharmaceutical and food industries. and catalyst area.
  • a small amount of lubricant dosed by means of a metering pump in dissolved, suspended or molten form is transferred together with its vehicle with a small amount of gas sufficient for this to the tabletting tools and driven apart with a subsequent larger amount of gas.
  • Air is preferably used as the gas.
  • This causes depletion in the middle of the lubricant stain and a significant accumulation of lubricant in the peripheral area.
  • the transfer of this principle to the filming of the tools means that in an ideal manner, where little lubrication or anti-adhesion is necessary, the described depletion and in the edge area, e.g. B. at the transition to the die wall, the necessary lubricant enrichment to overcome the friction when ejecting the tablet.
  • the meniscus of the liquid lubricant, or a drop of lubricant adhering to it at the open end of a liquid tube in the nozzle, generated in the time interval between two stamps passing by a continuously operating metering pump, or a lubricant drop adhering there, is released by the first air released by the activated air valve transported to the surface of the pressing tools and driven apart on these surfaces by a subsequently developing air pulse.
  • the coating process is therefore superimposed on a second process: the liquid continuously conveyed during the duration of the air pulse, which in the form of very small droplets at the end of the liquid tube in a nozzle, e.g.
  • the spray patterns with the inhomogeneous lubricant distribution with preference for the edge area and the fact that the main amount of the metered liquid is pumped between 2 stamps during the break (approx. 75% estimated), prove the preferred distribution of the Amount of lubricant according to the principle according to the invention "transfer to the tools / drive apart, in particular to the die wall".
  • the liquid tube of which has an inner diameter of 0.3 mm, and a quantity of lubricant liquid of 9 ml per 50,000 cycles there is generally no real drop formation at the end of the liquid tube; Rather, the gas or air there tears a convex meniscus that is being formed, which is then conveyed to the surface of the pressing tools to be acted upon and spread out there to the edge zones of this surface.
  • a metering pump z. B a centrifugal pump or peristaltic pump, in particular a gear pump.
  • the different lubricant requirements between the upper punch and the lower punch with the die wall can be controlled or regulated via the cross-section of the line (e.g. via the cross-section of the hose lines). It is recommended, however, in the feed lines for the liquid and the gas manually or process-linked controls, for. B. in the form of throttle valves (see below).
  • the amount of air applied is 1 to 35 ml per shot depending on the diameter of the lubricant droplets to be conveyed, approx.
  • 1 to 5 ml serve to detach the droplets from the nozzle opening and to transport them to the target points, 3 to 30 ml to disperse the Liquid, suspension or melt on the surface of the press tool in question.
  • the lubricant is fired at the right time over the center of the zone to be acted upon, the air blast for distributing the lubricant in this zone is somewhat delayed, e.g. B. after 1.5 ms.
  • the centrifugal pump continuously produces the lubricant metered in further, if the nozzle end is not close (in the range of a few millimeters) to the location to be acted on, there is a risk that subsequent droplets will be sprayed beyond the edge of the object.
  • a more time-controlled control of the air quantities can be achieved, however, in that an air valve is installed in the air supply line, by the actuation of which an air pulse is generated, such as that used to detach a liquid tube, e.g. B. in a two-fluid nozzle, built-up concave meniscus and for transporting the released droplet on the surface to be acted upon by a pressing tool is just needed.
  • the amount of air required to spread a droplet on the target surface is released by suddenly opening the air valve again or, alternatively, by opening a second air valve, the air supply line of which opens into the nozzle bypassing the first air valve.
  • a liquid valve in the lubricant supply line to the nozzle.
  • the liquid valve interrupts the continuous supply of the dissolved or suspended lubricant for a short time during which the zone of the pressing tool (e.g. a die) that has already been acted on before the nozzle opening is led away and a new target object is brought in. If one maintains the air volume control described above, then with the additional liquid control a very precise application of the desired zones and a good spreading of the lubricant droplets to the peripheral zones, that is e.g. B. up to the side walls of the matrices.
  • the separate air supply is preferably carried out via a three-substance nozzle, in the center of which the liquid tube is accommodated, which ends in the region of the nozzle opening, preferably just outside of it (eg 0.3 mm).
  • This Liquid tube surrounds a first air nozzle chamber, in which the quantity of air required for detaching the concave meniscus and for transporting the detached droplet or droplets to the target area is preferably released, preferably as a short air pulse.
  • This air nozzle chamber is surrounded by a second chamber, through which the air required for expansion is released.
  • the release of the liquid and air quantities takes place in a manner coupled to the cadence of the tableting machine in such a way that first, when the target object approaches, the liquid valve opens briefly, then the air quantity required for releasing droplets is brought in via the first air valve and then via the second air valve, the liquid droplets arriving at the target object are spread out there.
  • a first nozzle in the form of a two-substance nozzle consisting of the liquid tube and a nozzle chamber enveloping it with a nozzle opening for providing the gas for detaching and transporting the liquid droplets generated, with a downstream separate gas or air nozzle its own air valve is added to spread the droplets apart on the target object.
  • the three-component nozzle described above is thus divided into two separate nozzles; this creates a spatial separation between a metering device and a device for spreading apart a lubricant liquid, suspension or melt.
  • the air used for expansion generally with a higher gas pressure, e.g. 4 bar
  • the spatial distance of such a two-part nozzle arrangement can be changed by devices known per se in accordance with the number of revolutions of the tablet plate, in order to optimally offset the two functions, namely Transfer of the lubricant to the pressing tools and spreading apart the lubricant drops.
  • Electromagnetically or pneumatically operated air and liquid valves are generally used for the devices described above for carrying out the method according to the invention; however, these valves can also be replaced by piezo valves, in particular piezo air valves, which operate almost without inertia.
  • their drive piezo valve as an elongator or flexible oscillator
  • their drive can first set the cross-section of the opening to, for example, one tenth of the possible maximum opening, as a result of which the metered liquid is directed onto the tool without atomization.
  • the lubricant liquid or suspension is driven apart on the pressurized zone of the pressing tool when the piezo valve is opened to the maximum.
  • the used quick-closing valves for the air and liquid supply which are preferably operated electromagnetically be or work on a piezo basis, can be integrated in a so-called nozzle block, which also contains the nozzles with their supply lines, in the smallest space.
  • the valves divide the amount of lubricant metered in by a micropump and are controlled depending on the press speed by means of pulse generators known per se.
  • the actual metering of the lubricant liquid, suspension or melt does not take place via valves, but by means of a micropump.
  • a robust peristaltic pump has proven itself best as a micropump.
  • the micropump must be designed so that it is able to apply very small amounts of the lubricant, e.g. B. 10 g of the lubricant per hour to promote metered.
  • the nozzle assembly is, preferably, immediately in front of the filling shoe (behind the tablet scraper) and has e.g. B. each a lubricant nozzle directed downwards and upwards, optionally with an air nozzle arranged downstream, with which the amount of lubricant applied and metered from the lubricant nozzle is "blown" on the lower punch in a ring shape on the die wall.
  • the "lubricant application” looks, for example, as follows: a stamp shaft is tapped via a sensor and starts, after a selectable delay, the first pulse for the control of the liquid valve, the length of which, for. B. may be 1.35 ms (millisecond).
  • the lubricant liquid is preferably in a container under pressure (0.1 to 3.5 bar).
  • the amount of lubricant dispensed per molding is approximately 30 to 150 micrograms, depending on the size of the molding.
  • the second time-codable pulse which also has a selectable delay starts, is used for the air valve to selectively apply the amount of lubricant to the active tool surfaces with the help of a defined air blast.
  • the air valve is opened further or the 3rd valve, which supplies the 2nd air nozzle, starts after an adjustable delay in order to "blow” the applied amount of lubricant into a ring on the die wall, or to start the amount of lubricant on the upper punch spread the stamp edge.
  • control program of the valves which can also be combined with a dosing pump that runs synchronously with the machine cycle number (the press), comes from a pulse generator.
  • lubricant is stearic acid or fumaric acid in alcoholic solution, but also magnesium stearate in suspended form in a suitable medium.
  • the nozzles are preferably built in the dimensions 0.2 to 0.9 mm for the medium nozzle and 1.0 to 2.5 mm for the air nozzles. However, this is dependent on the tool surface, ie the diameter of the nozzle bores also depends on the size of the molding. In oblong tablets, e.g. B., the lubricant ring formation are also promoted with a special "program control". After the dose lubricant, the air nozzle takes on the task of blowing the material onto the die wall. Arrays arranged in the longitudinal direction (of the machine run) receive a longer "air time" from the air nozzle. In other arrangements, air nozzles that do not aim vertically can favor this process.
  • the presses should be designed during the coating process so that so-called. Pull-down curves (for the lower punch) of the die edge is exposed 3 to 5 mm so that the die walls can also be reached.
  • the air required for the deformation can also be generated by means of a mini air compressor running synchronously with the machine cycle number.
  • the mini compressor is then installed in the coating shoe in order to be able to generate the required amount of air directly in front of the nozzles and / or the valves. If desired, the mini air compressor can vary the air volume depending on the speed.
  • FIGS. 1 to 5 show a schematic structure of systems for coating mechanically stressed surfaces on pressing tools in tableting machines with lubricant solutions, suspensions or melts.
  • a pump (2) preferably a centrifugal pump, supplies the opening (4) in a nozzle (5) with a convex meniscus (1) via a lubricant line (3) with a defined inner diameter depending on the cadence of the tabletting machine ).
  • stage a clarifies the initial state, in the period between the passing of the 1st and the following one Stamp the air valve (6) in the air supply line (7) is still closed. During this time, the pump builds up a convex meniscus (1) at the opening (4).
  • the air valve begins to open, the convex lubricant meniscus is transferred here to the stamp surface (8) in the form of one or more droplets.
  • the air valve just supplies the maximum necessary air flow, which ensures the coating of the tool by driving the liquid, suspension or melt apart up to the edge zones of the tool, represented by position (9).
  • FIG. 2 An alternative procedure shown in FIG. 2 provides for the air valve (6) to give only an air pulse of the size required for detaching and transporting a droplet of lubricant onto the surface to be acted upon and for spreading the droplet on the surface Required amount of air through a second air valve (6a), which opens after the air valve (6) and before the nozzle (5) with its supply line in the line (7).
  • a second air valve (6a) which opens after the air valve (6) and before the nozzle (5) with its supply line in the line (7).
  • the amount of air needed to detach and transport the drop is much less than the amount of air needed to spread it (e.g., 18,000 lohms versus 400 lohms).
  • the actuation of both valves is clocked, depending on the cadence of the tablet machine.
  • a liquid valve (14) is fitted in the liquid line (3) between the metering pump (1) and the opening (4), which is clocked with the cadence the tabletting machine and with the opening operations of the air valve (6) or the air valves (6) and (6a) is opened and closed.
  • the process is as follows: the metering pump doses liquid into the line (3) with the liquid valve closed (if necessary, as long as the liquid valve (14) remains closed, the liquid is transferred again via a pressure relief valve (15) a line (16) conveyed into the reservoir).
  • the air valve (6) opens first and, somewhat later, the liquid valve (14). In the optimal air flow, the released liquid forming the meniscus (1) is conveyed to the tools and spread there.
  • a second air nozzle 10 which surrounds the air nozzle (5) in addition to the air nozzle (5) (see Fig. 4), which the provides air required to spread the lubricant. It is a so-called three-component nozzle.
  • the liquid valve releases a defined amount of lubricant, which is fired in the form of one or more drops through the opening (4) onto the surfaces to be acted upon.
  • the second air valve (6a) is opened, which temporarily releases a much larger amount of air, which is sufficient to spread the drops arriving on the surface of the press zones or to distribute them over them.
  • nozzle (5) is used only for detaching and transporting the drops and the nozzle (5) is followed by an air nozzle (10) with its own air valve (11), i.e. a spatial separation between one Device for metering and a device for spreading apart the lubricant liquid, suspension or melt is carried out.
  • air nozzle 10 with its own air valve (11)
  • a spatial separation between one Device for metering and a device for spreading apart the lubricant liquid, suspension or melt is carried out.
  • the metering pump (2) e.g. B.
  • an air nozzle (10) e.g. in the form of an air tube
  • said air nozzle being connected via a line (13) communicates with an air valve (11).
  • the air nozzle (10) emits a hard, short air pulse at the moment in which the relevant zone of the pressing tool, which is affected by drops, is located directly below it, which spreads the liquid drops on the zones to be coated and spreads the lubricant apart drives until this the peripheral zones, z. B. has reached the die edge.
  • This variant for loading zones of pressing tools is particularly suitable for very fast-running tablet presses that produce up to 500,000 tablets or cores per hour. With regard to the positioning of a corresponding device, larger distances between the nozzle end and receiver can also be accepted.
  • the air valves (6) and (11) are coupled to the cadence of the machine via proximity switches in connection with electronic balancing devices, as are the metering pump (2) with regard to the quantity of lubricant metered in the unit of time and, if necessary, the liquid valve (14).
  • the distance (12) depends, among other things, on the number of revolutions per unit time of the tablet plate; it is possible to use a suitable transport device to vary this distance (12) depending on the number of revolutions in a unit of time.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Medical Preparation Storing Or Oral Administration Devices (AREA)
  • Forging (AREA)
  • Medicinal Preparation (AREA)
EP19900100669 1989-01-26 1990-01-13 Procédé pour revêtir les outils de formage dans des machines de fabrication de tablettes Withdrawn EP0379912A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3902293 1989-01-26
DE19893902293 DE3902293A1 (de) 1989-01-26 1989-01-26 Neues verfahren zur presskammerbeschichtung mittels schmiermittelringbildung an der matrizenwand von tablettenpressen

Publications (2)

Publication Number Publication Date
EP0379912A2 true EP0379912A2 (fr) 1990-08-01
EP0379912A3 EP0379912A3 (fr) 1991-07-31

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ID=6372854

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Application Number Title Priority Date Filing Date
EP19900100669 Withdrawn EP0379912A3 (fr) 1989-01-26 1990-01-13 Procédé pour revêtir les outils de formage dans des machines de fabrication de tablettes

Country Status (5)

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EP (1) EP0379912A3 (fr)
JP (1) JPH02274397A (fr)
CA (1) CA2008554A1 (fr)
DD (1) DD291708A5 (fr)
DE (1) DE3902293A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5609908A (en) * 1991-02-05 1997-03-11 Voss; Gunter Apparatus for coating a pressing chamber with a lubricant
DE19647089A1 (de) * 1996-11-14 1998-05-28 Bayer Ag Vorrichtung zum kontrollierten Aufsprühen von pulverförmigen Schmiermitteln auf Stempel und Matrizen von Tablettenpressen
CN107971179A (zh) * 2017-06-21 2018-05-01 河北华胜塑胶机械制造有限公司 一种透气胶带制作机
WO2018219588A1 (fr) * 2017-05-30 2018-12-06 Dürr Systems Ag Dispositif d'application et procédé d'application

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4561644B2 (ja) * 2006-01-30 2010-10-13 Ｔｄｋ株式会社 粉末成形方法及び粉末成形装置
DE102016123279B4 (de) 2016-12-01 2019-02-21 Fette Compacting Gmbh Verfahren und System zum Zuführen eines Schmier- oder Trennmittels zu Presswerkzeugen einer Tablettenpresse

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0011269A1 (fr) * 1978-11-15 1980-05-28 Dr. Karl Thomae GmbH Procédé et dispositif pour pointiller des dispositifs de moulage avec des gouttes discrètes de lubrifiant liquide ou en suspension lors de la fabrication d'objets moulés dans le domaine pharmaceutique, alimentaire ou catalytique
US4205708A (en) * 1977-04-14 1980-06-03 Sulzer Brothers Limited Lubricating system and method for a textile machine
EP0122519A2 (fr) * 1983-04-08 1984-10-24 Dr. Karl Thomae GmbH Procédé et dispositifs pour pointiller des dispositifs de moulage avec des gouttes de lubrifiant liquide ou en suspension lors de la fabrication d'objets moulés dans le domaine pharmaceutique, alimentaire ou catalytique
EP0262538A1 (fr) * 1986-10-03 1988-04-06 Dr. Karl Thomae GmbH Procédé pour la libération dosée de quantités de lubrifiant dans l'enduction des outils de presse avec des liquides et des suspensions de lubrifiant et dispositif pour la mise en oeuvre du procédé
US4778642A (en) * 1986-06-17 1988-10-18 Robotic Vision Systems, Inc. Sealant bead profile control

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4205708A (en) * 1977-04-14 1980-06-03 Sulzer Brothers Limited Lubricating system and method for a textile machine
EP0011269A1 (fr) * 1978-11-15 1980-05-28 Dr. Karl Thomae GmbH Procédé et dispositif pour pointiller des dispositifs de moulage avec des gouttes discrètes de lubrifiant liquide ou en suspension lors de la fabrication d'objets moulés dans le domaine pharmaceutique, alimentaire ou catalytique
EP0122519A2 (fr) * 1983-04-08 1984-10-24 Dr. Karl Thomae GmbH Procédé et dispositifs pour pointiller des dispositifs de moulage avec des gouttes de lubrifiant liquide ou en suspension lors de la fabrication d'objets moulés dans le domaine pharmaceutique, alimentaire ou catalytique
US4778642A (en) * 1986-06-17 1988-10-18 Robotic Vision Systems, Inc. Sealant bead profile control
EP0262538A1 (fr) * 1986-10-03 1988-04-06 Dr. Karl Thomae GmbH Procédé pour la libération dosée de quantités de lubrifiant dans l'enduction des outils de presse avec des liquides et des suspensions de lubrifiant et dispositif pour la mise en oeuvre du procédé

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5609908A (en) * 1991-02-05 1997-03-11 Voss; Gunter Apparatus for coating a pressing chamber with a lubricant
DE19647089A1 (de) * 1996-11-14 1998-05-28 Bayer Ag Vorrichtung zum kontrollierten Aufsprühen von pulverförmigen Schmiermitteln auf Stempel und Matrizen von Tablettenpressen
US6079968A (en) * 1996-11-14 2000-06-27 Bayer Aktiengesellschaft Device for the controlled spraying of pulverulent lubricants onto punches and dies of tableting presses
WO2018219588A1 (fr) * 2017-05-30 2018-12-06 Dürr Systems Ag Dispositif d'application et procédé d'application
CN107971179A (zh) * 2017-06-21 2018-05-01 河北华胜塑胶机械制造有限公司 一种透气胶带制作机

Also Published As

Publication number Publication date
DE3902293A1 (de) 1990-08-02
DD291708A5 (de) 1991-07-11
JPH02274397A (ja) 1990-11-08
CA2008554A1 (fr) 1990-07-26
EP0379912A3 (fr) 1991-07-31

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