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EP0570446B1 - Procédé de revêtement d'un substrat avec un liquide - Google Patents

Procédé de revêtement d'un substrat avec un liquide Download PDF

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Publication number
EP0570446B1
EP0570446B1 EP92904219A EP92904219A EP0570446B1 EP 0570446 B1 EP0570446 B1 EP 0570446B1 EP 92904219 A EP92904219 A EP 92904219A EP 92904219 A EP92904219 A EP 92904219A EP 0570446 B1 EP0570446 B1 EP 0570446B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
process according
internal nozzle
gas inlet
fluid
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
EP92904219A
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German (de)
English (en)
Other versions
EP0570446A1 (fr
Inventor
Gunter Meinhardt Voss
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Individual
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Individual
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 Individual filed Critical Individual
Publication of EP0570446A1 publication Critical patent/EP0570446A1/fr
Application granted granted Critical
Publication of EP0570446B1 publication Critical patent/EP0570446B1/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
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/10—Spray pistols; Apparatus for discharge producing a swirling discharge
    • 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
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
    • 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 invention relates to a method for applying a liquid to a substrate, using a device with a two-substance nozzle, according to the preamble of patent claim 1.
  • Methods of this type can also be used for microdosing and in particular for introducing an active ingredient into a carrier, such as a tablet.
  • Another important application of such methods is the coating of a press chamber with a lubricant: for example in the manufacture of tablets for human and / or veterinary medicine, catalysts and various foodstuffs, it is necessary to use the upper punch or the male and the lower punch or coat the die with a lubricant to facilitate both the pressing process and the ejection of the tablet after the pressing process is complete.
  • a press chamber coating device is shown in Fig. 1 of this article.
  • a nozzle system is used which has a two-substance nozzle from which lubricant mixed with air emerges intermittently.
  • lubricant medium and air are alternately metered into the nozzle prechamber.
  • the lubricant is applied essentially to the bottom surfaces of the male and female dies or the lower die; According to the invention, however, it has been recognized that lubricant is required, in particular, on the peripheral edge of the tablet, ie the die, that is to say at the locations to which only comparatively little lubricant is used in the known device is applied. With this device, more lubricant than required is thus applied to the floor surfaces if the amount of lubricant on the press chamber peripheral wall (ie die) is optimally metered.
  • EP-A-0 244 204 discloses a method and a device for applying a liquid to a substrate; this method was used in the formulation of the preamble of claim 1.
  • the device has a two-substance nozzle which has an inner nozzle with an outlet opening and an annular space coaxially surrounding this inner nozzle.
  • the annular space has an outlet opening surrounding the outlet opening of the inner nozzle.
  • At least one gas inlet nozzle opens into the lateral surface of the annular space, the longitudinal axis of which does not intersect the longitudinal axis of the inner nozzle.
  • a device is also provided which supplies the liquid to the inner nozzle and a gas to the annular space.
  • EP-A-0 244 204 does not specify any operating parameters which would allow the liquid to be discharged on a hollow cone, as would be optimal according to the above statements, for example for coating press chambers with a lubricant.
  • the invention has for its object to develop a method for applying a liquid to a substrate according to the preamble of claim 1 such that it is possible, inter alia. to obtain annular application images on the substrate, so that, for example, when using the method according to the invention for coating a press chamber, the lubricant is primarily applied to the press chamber peripheral wall.
  • the gas entering the annular space which can be in particular air, but also an inert gas, such as nitrogen or a noble gas, is placed in a "turbulent ring flow" in the process according to the invention, which due to the metering of the liquid at the Exit opening of the inner nozzle formed convex meniscus "entrains".
  • the liquid is transported to the substrate essentially in a rotating path, which lies approximately on a conical surface.
  • the conical path results in a significantly thicker coating of the peripheral surface than the bottom surface, and in particular an excellent lubricant application to the between the lower stamp and the die formed gap.
  • a nozzle system is provided for each of the upper and lower tools, which is arranged such that the outlet openings lie opposite the respective bottom surface of the tool.
  • the “cone angle” depends on the distance (in the direction of the longitudinal axis) of the inner nozzle from the surrounding outlet opening and the dimensions of the individual elements:
  • the ring or point diameter is reduced. Conversely, the ring diameter increases when the distance is reduced:
  • a cone angle of approximately 90 ° is obtained with the usual viscosities of lubricants used in the pharmaceutical sector if the inner nozzle protrudes 0.1 mm beyond the ring opening with the specified dimensions.
  • the “inner diameter of the ring" can be made so small by appropriate design of the nozzle that in practice there is a point with a particularly preferred almost rectangular distribution of the coating material over the "area of the point".
  • suspensions which can be used in the process according to the invention have the advantage that practically all of the alcohol (e.g. ethanol) "evaporates” between the outlet opening and the tool surface or substrate, so that the lubricant is applied “dry”.
  • the permanent gas flow prevents the lubricant from “falling back” into the nozzle and other causes of contamination.
  • the method according to the invention enables the smallest amounts of liquid to be metered, so that it can be used in particular for microdosing.
  • the gas inlet nozzle has a cross-sectional constriction to increase the gas velocity, which in particular can at least reach the value 2.
  • a turbulent gas flow to provide at least two gas inlet nozzles in the annular space.
  • the gas inlet nozzles can be spaced in the direction of the longitudinal axis of the inner nozzle or they can be in the same plane, which is preferably as close as possible to the annular outlet opening.
  • the liquid is conveyed from a storage container via a pump and a valve system and corresponding connecting lines back into the storage container, and the amount of liquid required for the discharge in the almost unpressurized part of the circuit is removed via a bypass line, the cross section of which preferably smaller by at least a factor of 3 than the cross section of the Delivery line is a particularly pulsation-free, yet intermittently operable variable delivery of the small amounts of liquid required in the inventive method is achieved.
  • the method according to the invention is described below as an example for the coating of a press chamber.
  • the nozzle system designed according to the invention can be used in the same way for microdosing or for a printer and in particular a so-called large-character printer.
  • the device for coating a press chamber 1 with a lubricant such as is used in particular for the production of tablets, has an inner nozzle 2 with a longitudinal axis 2 ', to which the lubricant is fed intermittently.
  • a body 3 forms, together with the inner nozzle, an annular space 4 surrounding it.
  • two gas inlet nozzles 51 and 52 with longitudinal axes 51 'and 52' are provided, which are diametrically opposed to one another with respect to the axis of the inner nozzle and - at the embodiment shown - have a distance in the direction of the axis of the inner nozzle 2.
  • the axis of the gas inlet nozzles do not intersect the axis of the inner nozzle 2.
  • the axes of the gas inlet nozzle lie approximately in the tangent to the outer boundary wall of the annular space.
  • a gas for example air
  • the gas inlet nozzles 51 and 52 have a cross-sectional constriction, which typically reduces the cross-sectional area by at least a factor of 2. This makes it possible to supply small gas flows with low overpressures, typically in the range from 100 to 500 mbar. Nevertheless, there is good swirling of the gas in the annular space 4.
  • An outlet opening 33 for the gas surrounding the inner nozzle 2 is provided in the end face 32 of the body 3.
  • the front boundary surface of the inner nozzle 2 projects approximately 0.1 mm above the ring opening 33.
  • the boundary surface of the inner nozzle is preferably ground conically at a 30 ° to 45 ° angle.
  • the lubricant container can be a diffusion-proof bag with inlet and outlet and visual inspection.
  • the liquid is preferably metered intermittently into the rotating gas stream with a high-speed microvalve.
  • the dosing and dispensing process takes about 0.5 to 1 msec.
  • An almost unpressurized liquid is applied to the valve, so that it can be controlled at frequencies of 100 to approximately 300 Hz or more. Nevertheless, the gas consumption is only about 2 l / min.
  • the inventive lubricant is conveyed on a rotating path that runs obliquely to the nozzle axis.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Non-Metallic Protective Coatings For Printed Circuits (AREA)
  • Coating Apparatus (AREA)

Claims (19)

  1. Procédé pour l'application d'un liquide sur un substrat en utilisant un dispositif comportant
    - une tuyère à deux éléments qui
    - possède une tuyère interne (2) avec une ouverture de sortie, et
    - une chambre circulaire (4) entourant coaxialement cette tuyère interne (2), chambre circulaire (4) qui possède une ouverture de sortie (33) entourant l'ouverture de sortie de la tuyère interne (2), et dans la face d'enveloppe (31) de laquelle débouche au moins une tuyère d'entrée de gaz (51, 52), dont l'axe longitudinal (51', 52') ne coupe pas l'axe longitudinal (2') de la tuyère interne (2), et
    - un dispositif qui amène le liquide à la tuyère interne (2) et un gaz à la chambre circulaire (4),
       caractérisé en ce que le liquide est une solution, une dispersion ou une suspension d'un produit de revêtement dans un liquide porteur évaporable, en ce que le dispositif amène à la tuyère interne (2) le liquide de façon intermittente et à la chambre circulaire (4) le gaz de façon continue et en ce que la distance entre l'extrémité avant de la tuyère interne (2) et de l'ouverture de sortie (33) entourant la tuyère interne (2), de la chambre circulaire (4) ainsi que le diamètre interne et le diamètre externe et l'angle de cône de la tuyère interne (2) sont sélectionnés en fonction de la viscosité et de la tension superficielle du liquide utilisé, en ce que pour la tuyère interne (2) ne se manifeste qu'un très léger effet de Venturi de sorte que le liquide est éjecté en formant un cône creux, de sorte que
    - la distance entre l'extrémité avant de la tuyère interne (2) et celle de l'ouverture de sortie (33) entourant la tuyère interne (2), de la chambre circulaire (4) est en particulier de 0,1 mm,
    - le diamètre intérieur de la tuyère interne (2) est en particulier de 0,4 à 0,6 mm,
    - le diamètre extérieur de la tuyère interne (2) est en particulier de 0,7 mm, et
    - l'angle de cône de la tuyère interne (2) est en particulier de 30 à 45°.
  2. Procédé selon la revendication 1, caractérisé en ce que la tuyère d'entrée de gaz (51, 52) présente un rétrécissement de section transversale pour augmenter la vitesse.
  3. Procédé selon la revendication 2, caractérisé en ce qu'entre l'entrée et la sortie, la section transversale de la tuyère d'entrée de gaz (51, 52) est diminuée d'au moins un facteur de 2.
  4. Procédé selon la revendication 3, caractérisé en ce que le gaz est amené avec une surpression de 100 à 500 mbars par rapport à la pression ambiante.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que l'axe de la tuyère d'entrée de gaz (51, 52) est situé sur la tangente de la paroi de limitation extérieure (31) de la chambre circulaire (4).
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que la chambre circulaire (4) présente deux tuyères d'entrée de gaz (51, 52) dont les axes longitudinaux sont disposés de façon diamétralement opposée pour une projection sur un plan vertical par rapport à l'axe longitudinal de la tuyère interne (2).
  7. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la chambre circulaire (4) comporte trois ou plus de trois tuyères d'entrée de gaz dont les axes longitudinaux ont la même distance d'angle pour une projection sur un plan vertical par rapport à l'axe longitudinal de la tuyère interne (2).
  8. Procédé selon la revendication 6 ou 7, caractérisé en ce que les axes longitudinaux des tuyères d'entrée de gaz (51, 52) présentent dans la direction de l'axe longitudinal de la tuyère interne (2) une certaine distance entre eux.
  9. Procédé selon la revendication 6 ou 7, caractérisé en ce que les axes longitudinaux des tuyères d'entrée de gaz (51, 52) reposent dans le même plan qui se situe perpendiculairement à l'axe longitudinal de la tuyère interne (2).
  10. Procédé selon l'une des revendications 1 à 9, caractérisé en ce que la phase de limitation avant de la tuyère interne (2) est déplaçable par rapport à l'ouverture circulaire (33) dans la direction de l'axe longitudinal de la tuyère interne (2).
  11. Procédé selon l'une des revendications 1 à 10, caractérisé en ce que l'on utilise de l'air en tant que gaz.
  12. Procédé selon la revendication 11, caractérisé en ce que pour une opération de revêtement, on achemine 0,1-20 µg de liquide par réglage du temps d'ouverture d'une soupape dans l'amenée du lubrifiant en fonction de la pression avoisinante.
  13. Procédé selon l'une des revendications 1 à 12, caractérisé en ce que le liquide est ramené à partir d'un réservoir de stockage par l'intermédiaire d'une pompe et d'un système de soupape ainsi que de conduites de liaison correspondantes dans le réservoir de stockage et en ce que la quantité de lubrifiant nécessaire pour le revêtement est prélevée dans la partie exempte de pression du circuit par une conduite de dérivation dont la section transversale est au moins inférieure à la section transversale de la conduite d'acheminement d'un facteur de 3.
  14. Procédé selon la revendication 13, caractérisé en ce qu'après interruption du service de refoulement de la pompe, celle-ci fonctionne pendant un court moment en service aspiration et les soupapes du système d'amenée du lubrifiant sont ouvertes.
  15. Procédé selon l'une des revendications 1 à 14, caractérisé en ce que l'on met en oeuvre une imprimante à jet d'encre.
  16. Procédé selon l'une des revendications 1 à 15, caractérisé en ce qu'il est mis en oeuvre pour le microdosage et en particulier pour l'introduction du principe actif d'un médicament dans un comprimé.
  17. Procédé selon l'une des revendications 1 à 16, caractérisé en ce qu'il est mis en oeuvre pour le microdosage et en particulier pour l'introduction du principe actif d'un médicament dans un comprimé.
  18. Procédé selon la revendication 17, caractérisé en ce que le liquide est constitué par une suspension de stéarate de magnésium dans l'alcool jusqu'à 50 %.
  19. Procédé selon la revendication 17 ou 18, caractérisé en ce qu'il est respectivement prévu un système de tuyère pour l'outil supérieur et inférieur de la chambre de compression, système qui est agencé de telle sorte que les ouvertures de sortie de la surface de fond respective de l'outil sont disposées en regard l'une de l'autre.
EP92904219A 1991-02-05 1992-02-05 Procédé de revêtement d'un substrat avec un liquide Expired - Lifetime EP0570446B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4103413 1991-02-05
DE4103413A DE4103413C1 (fr) 1991-02-05 1991-02-05
PCT/DE1992/000075 WO1992013643A1 (fr) 1991-02-05 1992-02-05 Dispositif d'enduction d'une chambre de compression avec un lubrifiant

Publications (2)

Publication Number Publication Date
EP0570446A1 EP0570446A1 (fr) 1993-11-24
EP0570446B1 true EP0570446B1 (fr) 1997-05-07

Family

ID=6424405

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92904219A Expired - Lifetime EP0570446B1 (fr) 1991-02-05 1992-02-05 Procédé de revêtement d'un substrat avec un liquide

Country Status (5)

Country Link
US (1) US5609908A (fr)
EP (1) EP0570446B1 (fr)
AT (1) ATE152641T1 (fr)
DE (2) DE4103413C1 (fr)
WO (1) WO1992013643A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005037773B3 (de) * 2005-08-10 2007-01-18 Voss, Gunter M. Verfahren zum Befilmen einer Oberflächenform mit einer Lösung

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DE4400112A1 (de) * 1994-01-04 1995-07-06 Gunter M Voss Verfahren zur Herstellung von Tabletten
DE4400111C2 (de) * 1994-01-04 2003-06-18 Gunter M Voss Verfahren zur Herstellung von Tabletten
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US6620358B2 (en) * 1996-07-03 2003-09-16 Gunter Voss Process for manufacturing tablets
DE19647089A1 (de) * 1996-11-14 1998-05-28 Bayer Ag Vorrichtung zum kontrollierten Aufsprühen von pulverförmigen Schmiermitteln auf Stempel und Matrizen von Tablettenpressen
US6461812B2 (en) * 1998-09-09 2002-10-08 Agilent Technologies, Inc. Method and multiple reservoir apparatus for fabrication of biomolecular arrays
US6702894B2 (en) 2001-10-24 2004-03-09 Hewlett-Packard Development Company, L.P. Fluid ejection cartridge and system for dispensing a bioactive substance
US6962715B2 (en) * 2001-10-24 2005-11-08 Hewlett-Packard Development Company, L.P. Method and dosage form for dispensing a bioactive substance
US6623785B2 (en) * 2001-06-07 2003-09-23 Hewlett-Packard Development Company, L.P. Pharmaceutical dispensing apparatus and method
US6786591B2 (en) 2002-10-24 2004-09-07 Hewlett-Packard Development Company, L.P. Fluid ejector apparatus and methods
US20040081689A1 (en) * 2002-10-24 2004-04-29 Dunfield John Stephen Pharmaceutical dosage form and method of making
JP2004298891A (ja) * 2003-03-28 2004-10-28 Mitsubishi Materials Corp 粉末成形金型装置及び粉末成形体の成形方法
US8609198B2 (en) * 2004-07-21 2013-12-17 Hewlett-Packard Development Company, L.P. Pharmaceutical dose form with a patterned coating and method of making the same
CA2647591C (fr) 2006-03-29 2016-07-26 Wm. Wrigley Jr. Company Produits comestibles imprimes sans contact et appareil et procede de production de ceux-ci
US8733274B2 (en) * 2006-10-20 2014-05-27 Hewlett-Packard Development Company, L.P. Tube mounted inkjet printhead die
US7867548B2 (en) * 2006-10-27 2011-01-11 Hewlett-Packard Development Company, L.P. Thermal ejection of solution having solute onto device medium
TWI583405B (zh) 2008-02-28 2017-05-21 艾伯維有限公司 錠劑及其製備
DE102016123279B4 (de) * 2016-12-01 2019-02-21 Fette Compacting Gmbh Verfahren und System zum Zuführen eines Schmier- oder Trennmittels zu Presswerkzeugen einer Tablettenpresse

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CH571365A5 (fr) * 1974-07-22 1976-01-15 Fischer Ag Georg
DE2717438A1 (de) * 1977-04-20 1978-10-26 Gunter M Voss Verfahren zum beschichten der presskammer von tablettiermaschinen
DE2808342A1 (de) * 1978-02-27 1979-09-06 Gerd W Dr Ing Seifert Verfahren zum erzeugen eines kegelfoermigen spruehstrahles sowie drallduesen- kapsel zur ausuebung des verfahrens
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DE3312634A1 (de) * 1983-04-08 1984-10-11 Dr. Karl Thomae Gmbh, 7950 Biberach Verbessertes verfahren und vorrichtungen zum bepunkten von formwerkzeugen mit troepfchen fluessiger oder suspendierter schmiermittel bei der herstellung von formlingen in pharma-, lebensmittel- oder katalysatorenbereich
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005037773B3 (de) * 2005-08-10 2007-01-18 Voss, Gunter M. Verfahren zum Befilmen einer Oberflächenform mit einer Lösung

Also Published As

Publication number Publication date
ATE152641T1 (de) 1997-05-15
EP0570446A1 (fr) 1993-11-24
DE4103413C1 (fr) 1992-11-12
US5609908A (en) 1997-03-11
WO1992013643A1 (fr) 1992-08-20
DE59208462D1 (de) 1997-06-12

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