EP1109672A1 - Capillary doctor blade with surface injection for liquid product screen printing and work method for said doctor blade - Google Patents

Capillary doctor blade with surface injection for liquid product screen printing and work method for said doctor blade

Info

Publication number
EP1109672A1
EP1109672A1 EP99940274A EP99940274A EP1109672A1 EP 1109672 A1 EP1109672 A1 EP 1109672A1 EP 99940274 A EP99940274 A EP 99940274A EP 99940274 A EP99940274 A EP 99940274A EP 1109672 A1 EP1109672 A1 EP 1109672A1
Authority
EP
European Patent Office
Prior art keywords
capillary
doctor blade
mask
product
surface injection
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
EP99940274A
Other languages
German (de)
French (fr)
Other versions
EP1109672B1 (en
Inventor
Francis Bourrieres
Clément KAISER
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.)
Novatec SA
Original Assignee
Novatec SA
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 Novatec SA filed Critical Novatec SA
Publication of EP1109672A1 publication Critical patent/EP1109672A1/en
Application granted granted Critical
Publication of EP1109672B1 publication Critical patent/EP1109672B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/44—Squeegees or doctors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2215/00—Screen printing machines
    • B41P2215/10—Screen printing machines characterised by their constructional features
    • B41P2215/13—Devices for increasing ink penetration
    • B41P2215/132—Devices for increasing ink penetration by increasing pressure above the screen

Definitions

  • the object of the present invention is a capillary doctor blade with surface injection for screen printing in optimal conditions of liquid products to viscous liquids through the openings of a screen printing screen.
  • This member is in particular adaptable to the device which is the subject of patent application FR 96.12671 or any other existing device with incorporated reservoir in which a pressure can be adjusted. DESCRIPTION OF THE PRIOR ART
  • the deposition of liquid products on a surface is done by spraying, by dipping, or by brush when there are no complex areas to be protected. Otherwise, ie if there are complex areas to be protected, the screen printing process is used.
  • the screen printing process consists of a screen or screen mask generally made from a canvas of synthetic material or stainless metal. This screen printing screen is made in such a way that it has closed areas and open areas corresponding to the drawings whose reproduction is desired.
  • the screen printing screen is applied to the surface to be screen printed and an inclined doctor blade simultaneously pressed and moved in a direction parallel to the screen forces the liquid product to pass through the open areas of the mask.
  • the doctor blades are generally formed either by a more or less hard rubber profile, or by stainless steel blades.
  • the transfer force imparted to the product depends on the angle formed between the plane of the mask and the active face of the doctor blade. The smaller the scraping angle, the greater the transfer force.
  • the masks can be made from a woven mesh of stainless steel, polyester or silk or it can be a stencil. These masks can be either planar or cylindrical in the case of continuous screen printing. Screen printing, as described above is a very old process but which has a certain number of drawbacks such as for example the change in rheology of the product to be transferred during work, either by evaporation of solvents contained in the product, or by interaction with the surrounding environment. This change in rheology results in an obligation to readjust the working parameters or to replace the altered product with good quality product.
  • Patent application FR 96.12671 proposes another device with improved sealing, but here again, significant product leaks have been observed as soon as it is sought to transfer liquid products and in this case also, the product contained between the elements. seal leaks from the device when separated from the mask.
  • the invention described and claimed by said French patent application is moreover limited to the application of pasty products such as soldering creams.
  • German patent n ° DE 43 30 681 in the name of ROLAND MAN DRUCKMASH proposes to ensure the coating of a product on a printing roller, an applicator device comprising a capillary element impregnated with the product to be coated in direct and constant contact with the roller to be coated.
  • This capillary element has the function of ensuring a homogeneous coating of the roller with which it is in contact.
  • This device although of interest in the exploitation of a capillary element intermediate, can not be used in the context of screen printing since the latter incorporates the use of a screen printing mask whose function is to ensure a good transfer of the product on the substrate to be screen printed.
  • the main drawback of conventional methods and devices lies in the difficulty of preventing the flow of the product when the latter is particularly fluid, when the applicator device is no longer in contact with the mask.
  • the present invention overcomes the various problems associated with transfer devices of the prior art. According to the device, object of the present invention, there is between the closed reservoir which contains the product to be transferred and the screen printing mask an organ called capillary scraper with surface injection for the production of deposits by screen printing of a liquid to viscous liquid product.
  • the liquid product being placed in a pressurizable reservoir open on the side of the mask by a distribution surface of dimension adapted to the width of the substrate on which the deposit is to be made;
  • the said reservoir integral with the surface injection capillary doctor blade is mounted on a screen printing machine and, in conjunction with the pressurization of the liquid, the reservoir plus surface injection capillary doctor blade assembly is subjected to a relative movement of translation relative to the mask and is pressed on it.
  • the capillary scraper with surface injection is interposed between said reservoir and said mask with surface injection, integrates a capillary element and has a more or less flow resistance so as to prevent the flow of liquid from the reservoir, when it is not under pressure and to allow it, when it is under pressure.
  • the said capillary scraper with surface injection is closed on the front part and on the rear part by sealing lips inclined in opposition which come into constant contact with said mask.
  • said doctor accepts elastic deformations through its sealing lips and contains an available volume of product which increases when the pressure is released on said capillary doctor blade with surface injection and which decreases when the 'we press the said injection doctor blade.
  • the invention consists of a means of using the capillary effect to avoid the natural flow of the product, associated with a very wide distribution slot provided by the doctor blade, object of the invention, the contact surface of which with the very important screen printing screen, represents the injection site in order to reduce the pressure to be exerted on the product while increasing the flow rate.
  • this surface-injected capillary doctor blade has a sufficiently high resistance to flow (capillarity) so that the product to be transferred does not flow from the device when the latter is separated from the screen printing mask and the product n is not under pressure.
  • the resistance to flow (capillarity) of the capillary element may be adjusted according to the viscosity of the product to be transferred.
  • the surface injection capillary doctor blade has a permeability in accordance with the requirements of the application, that is to say that the flow rate of the product under pressure through the surface injection capillary doctor blade is adaptable as a function of the range of desired screen printing speed, the nature of the substrate and the viscosity of the product to be transferred. It being understood that the flow rate through the surface injection capillary doctor blade is also adjustable by adjusting the pressure applied to the product in the reservoir.
  • the surface injection capillary doctor blade has an available volume occupied by the product which decreases if the contact force exerted to push the device in contact with the mask increases and which increases if the contact force is reduced. In this way, the residual liquid which is located at the level of the distribution surface will be re-aspirated by vacuum at the end of scraping or at the time of separation of the device and the screen.
  • the capillary doctor blade with surface injection has on the front and on the rear, two sealing lips inclined in opposition which have the function of scraping the excess product and thus of confining it inside. of the device. Additional sealing blocks arranged on either side of the device make it possible to avoid product leakage on the ends of the surface injection capillary doctor blade.
  • the surface injection capillary squeegee is flexible enough to conform to the variations in height linked to irregularities in the substrate or the mask and thus allow the sealing lips which delimit the distribution surface. to fulfill their role of scraping the surplus.
  • an intermediate capillary element between the product to be screen printed under pressure and the screen printing mask is not a simple adaptation of a known device in a new field of application but indeed the fruit of studies and of research aiming to meet a need different from that of a homogeneous coating of a printing roller but well to avoid the loss of product to be screen printed or at least the loss of its initial rheological characteristics by integration a capillary element retaining it when the pressure on the product is interrupted.
  • said sealing lips coming into contact with said mask and the opening of which determines the injection surface of the product accept elastic deformations and are in connection with said capillary element so as to change its volume depending on whether or not pressing said capillary doctor blade.
  • the surface injection capillary doctor blade constitutes an independent module which can be mounted on a transfer device comprising a pressurizable reservoir.
  • all of the constituent parts of the surface injection capillary doctor blade chemically resist the products used as well as the cleaning solvents which can be used for cleaning the transfer device.
  • FIG. 1 shows in section the traditional screen printing using a doctor blade according to the prior art
  • Figure 2 shows in section a screen printing device of pasty product according to patent application 96.12671 by the same inventor
  • - Figure 3 shows in section, the capillary scraper surface injection according to the present invention.
  • FIG. 4 represents a perspective view of the capillary scraper with surface injection.
  • Figure 5 shows in section a variant of the present invention.
  • Figure 6 shows the variant in a perspective view.
  • Figure 1 is shown the implementation of a screen printing using a doctor blade 3 of a product 4 through a mask 2 on the substrate 1.
  • the doctor blade which is inclined at an angle "a" relative to the surface of the substrate, moves in the direction E, it imparts a force perpendicular to the edge of the doctor blade on the product of which only the vertical component T, called transfer thrust, makes it possible to transfer the product through the mask.
  • FIG 2 there is shown a technique for direct transfer of pasty product through a mask invented by the same depositor.
  • the product 4 contained in the reservoir constituted by the flexible membrane 5 and the assembly 9 is transferred to the substrate 1 through the mask 2.
  • the force FI pushes the device against the mask and therefore generates a sealed contact between the sealing members or lips 6a and 6b and the mask.
  • the lips are fixed to the assembly 9 by means of the parts 7.
  • the transfer thrust generated by the force F2 on the piston 8 expels the product 4 by the distribution surface 10 delimited on either side, by the lips 6a and 6b.
  • This type of device is particularly suitable for the transfer of pasty products such as soldering creams or epoxy adhesives having a viscosity greater than or equal to 1000 poises. Indeed, for such high viscosities the product does not flow naturally from the device even when the latter is separated from the mask provided that the force F2 on the piston is zero. On the other hand, this type of device cannot be used for the transfer of liquid products. Not only is the seal not sufficiently effective at the ends and in the areas where the mask is not supported by the substrate, but also the product flows freely from the device either during the fitting of the latter. , either during separation with the mask or at rest if the lips do not perfectly fit the surface of the mask.
  • Figure 3 shows an embodiment of the present invention. It consists of interposing an autonomous element called a capillary scraper with surface injection between the reservoir constituted by the flexible membrane 5 and the assembly 9 containing the product to be transferred and the mask.
  • the surface injection capillary doctor blade is fixed to the assembly 9 using the screws 17.
  • the surface injection capillary doctor blade integrates a capillary element consisting of an elastically deformable profile 13, for example RTV 71557 silicone from Rhône Poulenc and d 'a mesh 12 fixed to the profile 13 and which has orifices 14 for feeding the product, uniformly distributed in the distribution zone 10, which open on the mask side in a counterbore 11.
  • the mesh 12 has the function of bringing all the orifices 14 and to homogenize the pressure of the liquid to be transferred over the entire surface 10 of the mask facing the counterbore.
  • the weft of the mesh 12 can be adjusted as a function of the viscosity of the product to be transferred. We will choose a mesh with lower opening rates that the product will have a low viscosity. In all cases, all of the openings 14 and of the mesh 12 have sufficient flow resistance (capillarity) so that the product cannot flow freely from the device when the latter is separated from the mask and the force F2 is released.
  • the set of orifices 14 and the opening rate of the mesh 12 must allow a flow of product subjected to the pressure in the reservoir in accordance with the target screen printing speed and the nature of the substrate to be printed.
  • the elastic profile is crushed so that the sealing members 6a and 6b arranged around the distribution surface 10 can conform to the variations in height and closely fit the mask so as to to avoid leaks.
  • This overwriting also performs another function.
  • the volume available inside the capillary scraper with surface injection and occupied by the product 4, determined by the orifices 14 and the countersinking decreases and conversely increases when the prestressing is released as can be the case during a downtime or between two screen prints. Consequently, in the latter case, the product which is situated at the level of the dispensing surface is re-aspirated into the reservoir and thus cannot escape from the device.
  • the materials of the various constituent parts of the surface injection capillary squeegee can be adapted according to the application and their chemical resistance to the product to be transferred.
  • the choice of mesh 12 will preferably be carried out on a mesh of the same type. nature.
  • the profile 13 is glued to a rigid support plate 18 which closes the reservoir and which supports the profile 13 so that it does not flex in the middle.
  • the plate 18 also has product passage holes 15 opposite the holes 14 in the profile 13. The diameter of these product passage holes 15 is advantageously calculated and adapted to the viscosity of the product as well as in adequacy with the size. cells constituting the capillary element.
  • FIG. 4 is a perspective view of the surface injection capillary doctor mentioned in FIG. 3.
  • the counterbore 11 which contains the mesh 12 does not extend over the entire length of the surface injection capillary doctor so that the product cannot not escape from both ends.
  • the surface injection capillary doctor blade is presented as an independent module which can be mounted on the reservoir of a direct transfer device.
  • the capillary element consists of an elastically deformable profile 16 made of open cell foam such as, for example, polyurethane foam which has both permeability sufficient for the product flow rate to be adequate for the need of the application when pressing with force F2 on the piston 8, but also sufficient flow resistance (capillarity) so that the product cannot flow freely from the device when it is separated from the mask and the force F2 is released.
  • open cell foam such as, for example, polyurethane foam which has both permeability sufficient for the product flow rate to be adequate for the need of the application when pressing with force F2 on the piston 8, but also sufficient flow resistance (capillarity) so that the product cannot flow freely from the device when it is separated from the mask and the force F2 is released.
  • the capillary scraper with surface injection has a volume occupied by the product which varies according to the preload FI applied to the device so that when the pressure is released the product which is at the around the distribution surface 10 is re-aspirated inside the device.
  • the foam profile occupies the entire volume between the lips 6a and 6b and the support plate 18.
  • FIG. 6 a perspective view of the capillary scraper with surface injection as described in FIG. 5.
  • the open cell foam does not extend over the entire length of the distribution surface in order to avoid lateral leaks from product.
  • a profile 19 of closed cell foam such as for example silicone foam or EPDM.
  • the lips 6a and 6b as well as the support plate 18 are bonded to the sections 19 so the capillary scraper with surface injection constitutes an independent and interchangeable module.
  • Interchangeability is particularly advantageous when it is desired to change the viscosity of the product or the range of screen printing speed, in this case it suffices to change the capillary scraper with surface injection by choosing a foam with an open cell dimension adapted to the need. of the new application.
  • Advantage can also be taken of interchangeability during cleaning since it can be done in masked time if two capillary injection scrapers are available identical surface.
  • Another way of ensuring the sealing at each end of the surface injection capillary doctor blade can be carried out by sealing the open cells for example with silicone, which can be poured into the foam in order to fill the cells, thus a single foam. is necessary to make an injection doctor blade.
  • silicone which can be poured into the foam in order to fill the cells, thus a single foam. is necessary to make an injection doctor blade.
  • the surface-injected capillary squeegee is in contact with the mask over the entire surface of the dispensing slot so that the product cannot accumulate in a pocket which would risk being emptied on the mask during a period of time. '' or when the device is removed from the mask.
  • the device according to the invention is therefore particularly suitable for rotary or flat screen printing of liquid products to viscous liquids on all kinds of substrates.
  • Operating in a sealed manner any interaction between the product and the external environment is avoided, which has the consequence of increasing the life of the products to be transferred and of limiting losses.
  • being able to act independently on the transfer thrust it therefore follows that the product flow rate through the capillary scraper with surface injection becomes adjustable, that is to say that it now becomes possible to increase considerably the speed of screen printing.
  • the device according to the invention can be adapted to existing devices.
  • it can be adapted to the PROFLOW device which is the trade name of the product which is the subject of patent application FR 96.12671 which has the consequence of considerably increasing the field of application. possible of this product.
  • This invention will in particular apply to industrial sectors already using screen printing for the deposition of liquid products: printing, manufacturing of posters, decoration (tiles, enamels, textiles %), glass industry, automobile ...
  • the liquid product is placed in a pressurizable reservoir open on the side of the mask by a distribution surface of dimension adapted to the width of the substrate on which the deposit is achieve; the said reservoir integral with the surface injection doctor blade is mounted on a screen printing machine and jointly with the pressurization of the liquid, the assembly consisting of the pressurizable reservoir and the capillary surface injection doctor blade are subjected to a relative movement of translation relative to the mask and is pressed on the latter.

Abstract

A capillary squeegee and a method utilizing a capillary squeegee for screen printing liquid product onto a substrate through apertures in a printing screen on translation thereover, the squeegee including a capillary element for delivering liquid product from a pressurizable reservoir to a printing screen, wherein the capillary element is configured to provide a flow resistance which is such as to prevent flow therefrom when not pressurized and allow flow therefrom when pressurized; and first and second sealing lips which, during screen printing, both together contact the printing screen, wherein the sealing lips are disposed, in oppositely-inclined relation, to opposed edges of the capillary element in the direction of translation and define a delivery aperture therebetween, the delivery aperture having size suited to the substrate.

Description

RACLE CAPILLAIRE A INJECTION SURFACIQUE POUR LA SÉRIGRAPHIE DE PRODUITS LIQUIDES ET PROCÉDÉ DE TRAVAIL DE HAIR SCRAPER WITH SURFACE INJECTION FOR SCREENING LIQUID PRODUCTS AND PROCESS FOR WORKING THEREOF
LA DITE RACLE DOMAINE D'APPLICATION DE L'INVENTION L'objet de la présente invention est une racle capillaire à injection surfacique pour la sérigraphie dans des conditions optimales de produits liquides à liquides visqueux à travers les ouvertures d'un écran de sérigraphie. Cet organe est notamment adaptable sur le dispositif qui fait l'objet de la demande de brevet FR 96.12671 ou tout autre dispositif existant à réservoir incorporé dans lequel une pression peut être ajustée. DESCRIPTION DE L'ART ANTÉRIEURTHE SAID SCRAPER FIELD OF APPLICATION OF THE INVENTION The object of the present invention is a capillary doctor blade with surface injection for screen printing in optimal conditions of liquid products to viscous liquids through the openings of a screen printing screen. This member is in particular adaptable to the device which is the subject of patent application FR 96.12671 or any other existing device with incorporated reservoir in which a pressure can be adjusted. DESCRIPTION OF THE PRIOR ART
Classiquement, le dépôt de produits liquides sur une surface se fait par pulvérisation, par trempage, ou à la brosse lorsqu'il n'y a pas de zones complexes à protéger. Dans le cas contraire, c'est à dire s'il y a des zones complexes à protéger, il est fait appel au procédé sérigraphique . En premier lieu, le procédé sérigraphique consiste en un écran ou masque de sérigraphie fait généralement à partir d'une toile en matériau synthétique ou en métal inoxydable. Cet écran de sérigraphie est réalisé de telle manière qu'il présente des zones obturées et des zones ouvertes correspondantes aux dessins dont on désire la reproduction. En deuxième lieu, l'écran de sérigraphie est appliqué sur la surface à sérigraphier et une racle inclinée simultanément appuyée et déplacée dans une direction parallèle à l'écran oblige le produit liquide à traverser les zones ouvertes du masque. Les racles sont généralement constituées soit par un profilé en caoutchouc plus ou moins dur, soit par des lames en acier inoxydable. Dans tous les cas, la force de transfert imprimée au produit dépend de l'angle formé entre le plan du masque et la face active de la racle. La force de transfert sera d'autant plus grande que cet angle de raclage sera faible. Quant aux masques, ils peuvent être faits à partir d'une maille tissée en acier inoxydable, en polyester ou en soie ou encore il peut s'agir d'un pochoir. Ces masques peuvent être soit plans, soit cylindriques dans le cas de la sérigraphie en continue. La sérigraphie, telle que décrite précédemment est un procédé très ancien mais qui présente un certain nombre d'inconvénients comme par exemple la modification de rhéologie du produit à transférer en cours de travail, soit par évaporation de solvants contenus dans le produit, soit par interaction avec le milieu ambiant. Cette modification de rhéologie se traduit par une obligation de réajuster les paramètres de travail ou de remplacer le produit altéré par du produit de bonne qualité.Conventionally, the deposition of liquid products on a surface is done by spraying, by dipping, or by brush when there are no complex areas to be protected. Otherwise, ie if there are complex areas to be protected, the screen printing process is used. First, the screen printing process consists of a screen or screen mask generally made from a canvas of synthetic material or stainless metal. This screen printing screen is made in such a way that it has closed areas and open areas corresponding to the drawings whose reproduction is desired. Secondly, the screen printing screen is applied to the surface to be screen printed and an inclined doctor blade simultaneously pressed and moved in a direction parallel to the screen forces the liquid product to pass through the open areas of the mask. The doctor blades are generally formed either by a more or less hard rubber profile, or by stainless steel blades. In all cases, the transfer force imparted to the product depends on the angle formed between the plane of the mask and the active face of the doctor blade. The smaller the scraping angle, the greater the transfer force. As for the masks, they can be made from a woven mesh of stainless steel, polyester or silk or it can be a stencil. These masks can be either planar or cylindrical in the case of continuous screen printing. Screen printing, as described above is a very old process but which has a certain number of drawbacks such as for example the change in rheology of the product to be transferred during work, either by evaporation of solvents contained in the product, or by interaction with the surrounding environment. This change in rheology results in an obligation to readjust the working parameters or to replace the altered product with good quality product.
Un autre inconvénient découle du fait que la force de transfert exercée sur le produit est difficilement maîtrisable. En effet, le contrôle de l'angle de racle n'est pas suffisant car la force de transfert est interdépendante de la vitesse de raclage, de la quantité de produit qui se situe devant la racle ainsi que de la rhéologie du produit qui est elle-même variable en cours de travail comme cela a été expliqué plus haut. De plus, comme la force de transfert maximum applicable est faible, il en découle que la vitesse maximum de raclage ainsi que le débit du produit sont limités également. Pour s'affranchir en partie de ce manque de maîtrise de la force de transfert, on peut avoir recours à une opération de nappage qui consiste à étaler le produit de façon uniforme sur la surface du masque et de le mettre ainsi à disposition pour l'opération de raclage proprement dite. Si cette opération supplémentaire améliore la qualité de la sérigraphie, elle présente la contre partie de mettre en contact avec le milieu ambiant une grande surface de produit, ce qui génère des modifications rapides de rhéologie par évaporation des solvants contenus dans le produit.Another drawback stems from the fact that the transfer force exerted on the product is difficult to control. Indeed, the control of the doctor blade angle is not sufficient because the transfer force is interdependent on the doctor speed, the quantity of product which is located in front of the doctor blade as well as the rheology of the product which is - even variable during work as explained above. In addition, as the maximum applicable transfer force is low, it follows that the maximum scraping speed as well as the product flow rate are also limited. To overcome in part this lack of control of the transfer force, one can use a coating operation which consists of spreading the product uniformly over the surface of the mask and thus making it available for actual scraping operation. If this additional operation improves the quality of the screen printing, it has the counterpart of bringing a large surface of product into contact with the environment, which generates rapid rheology changes by evaporation of the solvents contained in the product.
Afin de corriger les problèmes de modification de rhéologie et de mauvaise maîtrise de la poussée de transfert, un certain nombre de dispositifs ont été proposés. Ces dispositifs consistent tous à confiner le produit dans une chambre et à l'expulser sous pression par une fente de distribution très étroite en contact avec le masque .In order to correct the modification problems of rheology and poor control of the transfer thrust, a certain number of devices have been proposed. These devices all consist of confining the product in a chamber and expelling it under pressure through a very narrow dispensing slot in contact with the mask.
Les brevets WO 96/2008 et US 4,622,239 décrivent des dispositifs de ce type adaptés au transfert de produits pâteux tels que des crèmes à braser. Ces dispositifs ne s'appliquent pas au transfert de produits liquides de viscosité faible à forte, car l'étanchéité assurée par les membres qui délimitent la fente de distribution n'est pas efficace du fait qu'il s'agit d'une fente très large et que, par conséquent, chaque fois que le dispositif est séparé du masque, par exemple pour un changement de série, le produit contenu dans le dispositif va s'en écouler, d'où des pertes de produits importantes.The patents WO 96/2008 and US 4,622,239 describe devices of this type suitable for the transfer of pasty products such as solder creams. These devices do not apply to the transfer of liquid products of low to high viscosity, since the sealing provided by the members which delimit the distribution slot is not effective because it is a very narrow slot. wide and, therefore, each time the device is separated from the mask, for example for a change of series, the product contained in the device will flow out, resulting in significant product losses.
La demande de brevet FR 96.12671 propose un autre dispositif avec une étanchéité améliorée mais, là encore, des fuites importantes de produit ont été observées dès que l'on cherche à transférer des produits liquides et dans ce cas également, le produit contenu entre les éléments d' étanchéité s'écoule du dispositif lorsqu'on le sépare du masque. L'invention décrite et revendiquée par ladite demande de brevet français est d'ailleurs limitée à l'application des produits pâteux tels que des crèmes à braser .Patent application FR 96.12671 proposes another device with improved sealing, but here again, significant product leaks have been observed as soon as it is sought to transfer liquid products and in this case also, the product contained between the elements. seal leaks from the device when separated from the mask. The invention described and claimed by said French patent application is moreover limited to the application of pasty products such as soldering creams.
Les brevets suivants :The following patents:
- US 3 , 921 , 521 - US 4 , 023 , 486- US 3, 921, 521 - US 4, 023, 486
- GB 1 , 433 , 957- GB 1, 433, 957
- DE 2 , 250 , 092 f ont également état de dispos i t i f s f ermés pour le trans fert qui , cette foi s , sont dédiés aux produits liquides , mais là encore tous ces dispositif s présentent une chambre de distribution délimitée en partie basse par les membres d' étanchéité formant une fente étroite et fermée par le masque de sérigraphie, ce qui implique un écoulement du produit contenu dans cette chambre lorsque ces dispositifs sont séparés du masque. Dans tous les brevets précédemment cités, on constate en particulier des fuites de produit dans les zones du masque qui ne sont pas soutenues par le substrat comme par exemple sur les côtés lorsque ce dernier est moins large que la longueur de la fente de distribution de produit ou encore en début ou en fin de raclage lorsque l'on change le substrat sérigraphié par un substrat neuf. Toutes ces fuites, quelle que soit leur cause, sont particulièrement néfastes, car non seulement elles génèrent des pertes de produit importantes mais, de plus, elles peuvent perturber la qualité des dépôts. En effet, lorsque ce produit exposé à l'air ambiant se retrouve de façon aléatoire à la surface du masque et est donc transféré involontairement sur le substrat lors d'une sérigraphie ultérieure, cela peut conduire à des dépôts qui manquent de précision ou de mauvaise qualité. De plus, l'excès de produit sur le masque provoque des temps d'arrêt prolongés pour le nettoyage et pose des problèmes d'hygiène et de sécurité pour le personnel qui est en contact avec lesdits produits, particulièrement avec les encres à base de solvants très volatils et dangereux tel que le toluène.- DE 2, 250, 092 f also have closed devices for the transfer which, this time, are dedicated to liquid products, but again all these devices have a distribution chamber delimited at the bottom by the sealing members forming a narrow slot closed by the screen printing mask, which implies a flow of the product contained in this chamber when these devices are separated from the mask. In all the aforementioned patents, there is in particular leakage of product in the areas of the mask which are not supported by the substrate, for example on the sides when the latter is less wide than the length of the product distribution slot. or even at the beginning or at the end of scraping when the screen-printed substrate is changed by a new substrate. All these leaks, whatever their cause, are particularly harmful, because not only do they generate significant losses of product but, moreover, they can disturb the quality of the deposits. In fact, when this product exposed to the ambient air is found randomly on the surface of the mask and is therefore involuntarily transferred onto the substrate during a subsequent screen printing, this can lead to deposits which lack precision or poor quality. quality. In addition, the excess product on the mask causes prolonged downtime for cleaning and poses health and safety problems for personnel who are in contact with said products, particularly with solvent-based inks. very volatile and dangerous such as toluene.
Dans un domaine sensiblement différent de celui de l'invention, à savoir celui de l'héliogravure et/ou de la flexographie, le brevet allemand n° DE 43 30 681 au nom de ROLAND MAN DRUCKMASH , propose pour assurer l'enduction d'un produit sur un rouleau d'impression, un dispositif applicateur comportant un élément capillaire imprégné du produit à enduire en contact direct et constant avec le rouleau à enduire. Cet élément capillaire a pour fonction d'assurer un enduction homogène du rouleau avec lequel il est en contact. Ce dispositif, bien que présentant un intérêt dans l'exploitation d'un élément capillaire intermédiaire, ne peut pas être exploité dans le cadre d'une sérigraphie puisque cette dernière intègre l'utilisation d'un masque de sérigraphie dont la fonction est d'assurer un bon transfert du produit sur le substrat à sérigraphier. En outre, l'inconvénient principal des procédés et dispositifs classiques réside dans la difficulté à empêcher l'écoulement du produit lorsque ce dernier est particulièrement fluide, lorsque le dispositif applicateur n'est plus en contact avec le masque.In a field appreciably different from that of the invention, namely that of gravure printing and / or flexography, the German patent n ° DE 43 30 681 in the name of ROLAND MAN DRUCKMASH, proposes to ensure the coating of a product on a printing roller, an applicator device comprising a capillary element impregnated with the product to be coated in direct and constant contact with the roller to be coated. This capillary element has the function of ensuring a homogeneous coating of the roller with which it is in contact. This device, although of interest in the exploitation of a capillary element intermediate, can not be used in the context of screen printing since the latter incorporates the use of a screen printing mask whose function is to ensure a good transfer of the product on the substrate to be screen printed. In addition, the main drawback of conventional methods and devices lies in the difficulty of preventing the flow of the product when the latter is particularly fluid, when the applicator device is no longer in contact with the mask.
DESCRIPTION DE L'INVENTIONDESCRIPTION OF THE INVENTION
La présente invention permet de remédier aux différents problèmes liés aux dispositifs de transfert de l'art antérieur. Suivant le dispositif, objet de la présente invention, on dispose entre le réservoir fermé qui contient le produit à transférer et le masque de sérigraphie un organe appelé racle capillaire à injection surfacique pour la réalisation de dépôts par sérigraphie d'un produit liquide à liquide visqueux sur un substrat à travers les ouvertures d'un masque reposant sur le dit substrat ; le produit liquide étant disposé dans un réservoir pressurisable ouvert du côté du masque par une surface de distribution de dimension adaptée à la largeur du substrat sur lequel le dépôt est à réaliser ; le dit réservoir solidaire de la racle capillaire à injection surfacique est monté sur une machine de sérigraphie et conjointement à la mise sous pression du liquide, l'ensemble réservoir plus racle capillaire à injection surfacique est soumis à un mouvement relatif de translation par rapport au masque et est appuyé sur ce dernier .The present invention overcomes the various problems associated with transfer devices of the prior art. According to the device, object of the present invention, there is between the closed reservoir which contains the product to be transferred and the screen printing mask an organ called capillary scraper with surface injection for the production of deposits by screen printing of a liquid to viscous liquid product. on a substrate through the openings of a mask resting on said substrate; the liquid product being placed in a pressurizable reservoir open on the side of the mask by a distribution surface of dimension adapted to the width of the substrate on which the deposit is to be made; the said reservoir integral with the surface injection capillary doctor blade is mounted on a screen printing machine and, in conjunction with the pressurization of the liquid, the reservoir plus surface injection capillary doctor blade assembly is subjected to a relative movement of translation relative to the mask and is pressed on it.
Selon la caractéristique principale de l'invention, la racle capillaire à injection surfacique s'interpose entre le dit réservoir et le dit masque à injection surfacique, intègre un élément capillaire et présente une résistance à l'écoulement plus ou moins importante de façon à empêcher l'écoulement du liquide du réservoir, lorsqu'il n'est pas sous pression et à le permettre, lorsqu'il est sous pression. En outre, toujours selon cette caractéristique principale de l'invention, la dite racle capillaire à injection surfacique est fermée sur la partie avant et sur la partie arrière par des lèvres d' étanchéité inclinées en opposition qui viennent en contact constant avec le dit masque. De plus, ladite racle accepte les déformations élastiques par l'intermédiaire de ses lèvres d' étanchéité et contient un volume disponible de produit qui, augmente lorsque l'on relâche l'appui sur la dite racle capillaire à injection surfacique et qui diminue lorsque l'on appuie sur la dite racle à injection. Dans les organes de transfert classiques, afin de limiter au maximum l'écoulement naturel du liquide à déposer il faut resserrer au maximum la fente de distribution formée par les lèvres, de ce fait pour assurer un débit convenable il faut augmenter considérablement la pression sur le produit, ce qui est localement néfaste en particulier pour la durée de vie de l'écran et vis à vis de l'efficacité de l'étanchéité.According to the main characteristic of the invention, the capillary scraper with surface injection is interposed between said reservoir and said mask with surface injection, integrates a capillary element and has a more or less flow resistance so as to prevent the flow of liquid from the reservoir, when it is not under pressure and to allow it, when it is under pressure. In addition, still according to this main characteristic of the invention, the said capillary scraper with surface injection is closed on the front part and on the rear part by sealing lips inclined in opposition which come into constant contact with said mask. In addition, said doctor accepts elastic deformations through its sealing lips and contains an available volume of product which increases when the pressure is released on said capillary doctor blade with surface injection and which decreases when the 'we press the said injection doctor blade. In conventional transfer members, in order to limit as much as possible the natural flow of the liquid to be deposited, the distribution slot formed by the lips must be tightened as much as possible, therefore to ensure a suitable flow rate, the pressure on the product, which is locally harmful in particular for the life of the screen and with regard to the effectiveness of the seal.
L'invention consiste en un moyen d'utiliser l'effet capillaire pour éviter l'écoulement naturel du produit, associé à une fente de distribution très large proposée par la racle, objet de l'invention, dont la surface de contact avec l'écran de sérigraphie très importante, représente le lieu d'injection afin de réduire la pression à exercer sur le produit tout en augmentant le débit. Selon l'invention, cette racle capillaire à injection surfacique présente une résistance à 1 ' écoulement (capillarité) suffisamment importante pour que le produit à transférer ne s'écoule pas du dispositif lorsque ce dernier est séparé du masque de sérigraphie et que le produit n'est pas sous pression. La résistance à l'écoulement (capillarité) de l'élément capillaire pourra être ajustée en fonction de la viscosité du produit à transférer .The invention consists of a means of using the capillary effect to avoid the natural flow of the product, associated with a very wide distribution slot provided by the doctor blade, object of the invention, the contact surface of which with the very important screen printing screen, represents the injection site in order to reduce the pressure to be exerted on the product while increasing the flow rate. According to the invention, this surface-injected capillary doctor blade has a sufficiently high resistance to flow (capillarity) so that the product to be transferred does not flow from the device when the latter is separated from the screen printing mask and the product n is not under pressure. The resistance to flow (capillarity) of the capillary element may be adjusted according to the viscosity of the product to be transferred.
Selon l'invention, la racle capillaire à injection surfacique présente une perméabilité conforme aux besoins de l'application, c'est à dire que le débit du produit sous pression à travers la racle capillaire à injection surfacique est adaptable en fonction de la gamme de vitesse de sérigraphie souhaitée, de la nature du substrat et de la viscosité du produit à transférer. Étant entendu que le débit à travers la racle capillaire à injection surfacique est également ajustable par le réglage de la pression appliquée au produit dans le réservoir .According to the invention, the surface injection capillary doctor blade has a permeability in accordance with the requirements of the application, that is to say that the flow rate of the product under pressure through the surface injection capillary doctor blade is adaptable as a function of the range of desired screen printing speed, the nature of the substrate and the viscosity of the product to be transferred. It being understood that the flow rate through the surface injection capillary doctor blade is also adjustable by adjusting the pressure applied to the product in the reservoir.
Selon l'invention, la racle capillaire à injection surfacique présente un volume disponible occupé par le produit qui décroît si la force d'appui exercée pour pousser le dispositif en contact avec le masque augmente et qui croît si la force d'appui est diminuée. De cette façon, le liquide résiduel qui, se situe au niveau de la surface de distribution sera ré-aspiré par dépression en fin de raclage ou au moment de la séparation du dispositif et de l'écran.According to the invention, the surface injection capillary doctor blade has an available volume occupied by the product which decreases if the contact force exerted to push the device in contact with the mask increases and which increases if the contact force is reduced. In this way, the residual liquid which is located at the level of the distribution surface will be re-aspirated by vacuum at the end of scraping or at the time of separation of the device and the screen.
Selon l'invention, la racle capillaire à injection surfacique présente sur l'avant et sur l'arrière, deux lèvres d' étanchéité inclinées en opposition qui ont pour fonction de racler l'excédent de produit et ainsi de le confiner à l'intérieur du dispositif. Des blocs d' étanchéité supplémentaires disposés de part et d'autre du dispositif, permettent d'éviter les fuites de produit sur les extrémités de la racle capillaire à injection surfacique .According to the invention, the capillary doctor blade with surface injection has on the front and on the rear, two sealing lips inclined in opposition which have the function of scraping the excess product and thus of confining it inside. of the device. Additional sealing blocks arranged on either side of the device make it possible to avoid product leakage on the ends of the surface injection capillary doctor blade.
Selon l'invention, la racle capillaire à injection surfacique est suffisamment souple pour se conformer aux variations de hauteur liées aux irrégularités du substrat ou du masque et ainsi de permettre aux lèvres d' étanchéité qui délimitent la surface de distribution d'assurer leur rôle de raclage de l'excédent.According to the invention, the surface injection capillary squeegee is flexible enough to conform to the variations in height linked to irregularities in the substrate or the mask and thus allow the sealing lips which delimit the distribution surface. to fulfill their role of scraping the surplus.
Il est important de souligner l'adéquation entre les lèvres d'étanchéité et l'élément capillaire qui constituent les éléments principaux de la racle de l'invention. Cette combinaison entre l'élasticité des dites lèvres d'étanchéité et le volume occupé par l'élément capillaire ne peut apparaître dans le document allemand n° DE 43 30 681 au nom de ROLAND MAN DRUCKMASH, puisque les lèvres décrites dans ledit document ne sont as prévues élastiques et ne font pas évoluer par leur élasticité le volume de l'élément capillaire.It is important to emphasize the adequacy between the sealing lips and the capillary element which constitute the main elements of the doctor blade of the invention. This combination between the elasticity of said sealing lips and the volume occupied by the capillary element cannot appear in German document n ° DE 43 30 681 in the name of ROLAND MAN DRUCKMASH, since the lips described in said document are not have provided elastic and do not change by their elasticity the volume of the capillary element.
Aussi, l'exploitation d'un élément capillaire intermédiaire entre le produit à sérigraphier sous pression et le masque de sérigraphie n'est pas une simple adaptation d'un dispositif connu dans un nouveau domaine d'application mais bien le fruit d'études et de recherches ayant pour but de répondre à un besoin différent de celui d'une enduction homogène d'un rouleau d'impression mais bien d'éviter la perte de produit à sérigraphier ou au moins la perte de ses caractéristiques rhéologiques initiales par l'intégration d'un élément capillaire le retenant lorsque la pression sur le produit est interrompu .Also, the use of an intermediate capillary element between the product to be screen printed under pressure and the screen printing mask is not a simple adaptation of a known device in a new field of application but indeed the fruit of studies and of research aiming to meet a need different from that of a homogeneous coating of a printing roller but well to avoid the loss of product to be screen printed or at least the loss of its initial rheological characteristics by integration a capillary element retaining it when the pressure on the product is interrupted.
Selon une autre caractéristique particulièrement avantageuse de l'invention, les dites lèvres d'étanchéité venant en contact avec ledit masque et dont l'ouverture détermine la surface d'injection du produit, acceptent des déformations élastiques et sont en liaison avec le dit élément capillaire de façon à faire évoluer son volume selon qu'on appuie ou non sur la dite racle capillaire.According to another particularly advantageous characteristic of the invention, said sealing lips coming into contact with said mask and the opening of which determines the injection surface of the product, accept elastic deformations and are in connection with said capillary element so as to change its volume depending on whether or not pressing said capillary doctor blade.
Un autre objet de l'invention est constitué par le procédé de travail de la racle capillaire à injection surfacique qui propose d'utiliser la caractéristique ci- dessus mentionnée et consisteAnother object of the invention is constituted by the working method of the surface injection capillary doctor blade which proposes to use the characteristic mentioned above and consists
- à mettre en appui la dite racle sur le dit masque de façon à ce que les lèvres d'étanchéité assurent, de par leur liaison avec l'élément capillaire et de par leur élasticité, la réduction du volume de l'élément capillaire, à mettre sous pression le produit de façon à ce que ce dernier puisse passer à travers ledit élément capillaire, et à soumettre ladite racle à un mouvement relatif de translation par rapport au masque afin d'assurer la sérigraphie d'un substrat se trouvant sous le masque, puis - à cesser le mouvement, à supprimer la pression sur le produit de façon à ce que ce dernier ne passe plus par le dit élément capillaire, et à interrompre l'appui de ladite racle sur le dit masque de façon à ce que les lèvres d'étanchéité assurent, de par leur liaison avec l'élément capillaire et de par leur élasticité, l'augmentation du volume de l'élément capillaire afin que la dépression créée assure l'aspiration du produit présent immédiatement au voisinage de la surface d'injection, lors de l'interruption de la sérigraphie. Cette capacité à créer une dépression par relâchement de l'appui sur la racle, constitue une amélioration notable dans la conservation des caractéristiques rhéologiques du produit à sérigraphier ainsi que pour éviter la création de dépôt et le gaspillage de produit.- to press said scraper on said mask so that the sealing lips ensure, by their connection with the capillary element and by their elasticity, the reduction in the volume of the capillary element, to pressurize the product so that the latter can pass through said capillary element, and to subject said doctor blade to a relative translational movement relative to the mask in order to ensure the screen printing of a substrate located under the mask, then - to cease the movement, to remove the pressure on the product so that the latter no longer passes through said capillary element, and to interrupt the support of said doctor blade on said mask so that the sealing lips ensure, by their connection with the capillary element and by their elasticity, the increase in volume of the capillary element so that the vacuum created ensures the suction of the product present immediately in the vicinity of the injection surface, when the screen printing is interrupted. This capacity to create a depression by loosening the support on the doctor blade constitutes a notable improvement in the conservation of the rheological characteristics of the product to be screen printed as well as to avoid the creation of deposit and the waste of product.
Selon une autre caractéristique de l'invention, la racle capillaire à injection surfacique constitue un module indépendant pouvant être monté sur un dispositif de transfert comprenant un réservoir pressurisable .According to another characteristic of the invention, the surface injection capillary doctor blade constitutes an independent module which can be mounted on a transfer device comprising a pressurizable reservoir.
Selon une autre caractéristique de l'invention, l'ensemble des pièces constitutives de la racle capillaire à injection surfacique résiste chimiquement aux produits utilisés ainsi qu'aux solvants de nettoyage susceptibles d'être mis en oeuvre pour le nettoyage du dispositif de transfert .According to another characteristic of the invention, all of the constituent parts of the surface injection capillary doctor blade chemically resist the products used as well as the cleaning solvents which can be used for cleaning the transfer device.
La description ci-après donne deux formes de réalisation de l'invention, données à titre d'exemples non limitatifs et illustrées par les dessins qui permettront une meilleure compréhension et mettront en évidence d'autres avantages et d'autres caractéristiques de 1 ' invention .The description below gives two embodiments of the invention, given by way of nonlimiting examples and illustrated by the drawings which will a better understanding and will highlight other advantages and other characteristics of the invention.
BRÈVE DESCRIPTION DES DESSINS - la figure 1 représente en coupe la sérigraphie traditionnelle à l'aide d'une racle selon l'art antérieur, la figure 2 représente en coupe un dispositif de sérigraphie de produit pâteux selon la demande de brevet 96.12671 du même inventeur. - la figure 3 représente en coupe, la racle capillaire à injection surfacique selon la présente invention. la figure 4 représente une vue en perspective de la racle capillaire à injection surfacique. la figure 5 représente en coupe une variante de la présente invention. la figure 6 représente la variante selon une vue en perspective . DESCRIPTION DES MODES DE RÉALISATION PRÉFÉRÉSBRIEF DESCRIPTION OF THE DRAWINGS - Figure 1 shows in section the traditional screen printing using a doctor blade according to the prior art, Figure 2 shows in section a screen printing device of pasty product according to patent application 96.12671 by the same inventor . - Figure 3 shows in section, the capillary scraper surface injection according to the present invention. FIG. 4 represents a perspective view of the capillary scraper with surface injection. Figure 5 shows in section a variant of the present invention. Figure 6 shows the variant in a perspective view. DESCRIPTION OF THE PREFERRED EMBODIMENTS
En figure 1 est représentée la mise en oeuvre d'une sérigraphie à l'aide d'une racle 3 d'un produit 4 à travers un masque 2 sur le substrat 1. Lorsque la racle qui est inclinée d'un angle "a" par rapport à la surface du substrat, se déplace dans la direction E, elle imprime une force perpendiculaire à 1 ' arête de la racle sur le produit dont uniquement la composante verticale T, appelée poussée de transfert, permet de transférer le produit à travers le masque.In Figure 1 is shown the implementation of a screen printing using a doctor blade 3 of a product 4 through a mask 2 on the substrate 1. When the doctor blade which is inclined at an angle "a" relative to the surface of the substrate, moves in the direction E, it imparts a force perpendicular to the edge of the doctor blade on the product of which only the vertical component T, called transfer thrust, makes it possible to transfer the product through the mask.
Une diminution de l'angle d'inclinaison "a" permet de faire augmenter cette poussée de transfert mais la valeur maximale reste faible, ce qui limite par la même occasion le débit du produit à travers le masque et donc la vitesse maximum de sérigraphie possible. De plus, il apparaît clairement en figure 1 que le produit qui est sur le masque est exposé à l'air libre et est donc sujet à interaction avec le milieu ambiant ce qui génère un vieillissement prématuré du produit et donc des pertes importantes de ce même produit.A reduction in the angle of inclination "a" makes it possible to increase this transfer thrust but the maximum value remains low, which at the same time limits the flow of the product through the mask and therefore the maximum speed of screen printing possible. . In addition, it clearly appears in FIG. 1 that the product which is on the mask is exposed to the open air and is therefore subject to interaction with the ambient environment which generates premature aging of the product and therefore losses important of this same product.
En figure 2, est représentée une technique de transfert direct de produit pâteux à travers un masque inventé par le même déposant. Ici le produit 4 contenu dans le réservoir constitué par la membrane souple 5 et l'ensemble 9, est transféré sur le substrat 1 à travers le masque 2. La force FI pousse le dispositif contre le masque et de ce fait génère un contact étanche entre les organes ou lèvres d'étanchéité 6a et 6b et le masque. Les lèvres sont fixées sur l'ensemble 9 par le biais des pièces 7. Lorsque le dispositif est soumis à un mouvement relatif par rapport au masque dans la direction E, la poussée de transfert générée par la force F2 sur le piston 8 expulse le produit 4 par la surface de distribution 10 délimitée de part et d'autre, par les lèvres 6a et 6b. Ce type de dispositif est particulièrement adapté au transfert de produits pâteux tels que les crèmes à braser ou les colles epoxy ayant une viscosité supérieure ou égale à 1000 poises. En effet, pour des viscosités aussi importantes le produit ne s'écoule pas naturellement du dispositif même lorsque ce dernier est séparé du masque à condition que la force F2 sur le piston soit nulle. Par contre, ce type de dispositif n'est pas utilisable pour le transfert des produits liquides. Non seulement l'étanchéité n'est pas suffisamment efficace sur les extrémités et dans les zones où le masque n'est pas soutenu par le substrat, mais aussi le produit s'écoule librement du dispositif soit lors de la mise en place de ce dernier, soit lors de la séparation avec le masque ou au repos si les lèvres n'épousent pas parfaitement la surface du masque.In Figure 2, there is shown a technique for direct transfer of pasty product through a mask invented by the same depositor. Here the product 4 contained in the reservoir constituted by the flexible membrane 5 and the assembly 9, is transferred to the substrate 1 through the mask 2. The force FI pushes the device against the mask and therefore generates a sealed contact between the sealing members or lips 6a and 6b and the mask. The lips are fixed to the assembly 9 by means of the parts 7. When the device is subjected to a relative movement relative to the mask in the direction E, the transfer thrust generated by the force F2 on the piston 8 expels the product 4 by the distribution surface 10 delimited on either side, by the lips 6a and 6b. This type of device is particularly suitable for the transfer of pasty products such as soldering creams or epoxy adhesives having a viscosity greater than or equal to 1000 poises. Indeed, for such high viscosities the product does not flow naturally from the device even when the latter is separated from the mask provided that the force F2 on the piston is zero. On the other hand, this type of device cannot be used for the transfer of liquid products. Not only is the seal not sufficiently effective at the ends and in the areas where the mask is not supported by the substrate, but also the product flows freely from the device either during the fitting of the latter. , either during separation with the mask or at rest if the lips do not perfectly fit the surface of the mask.
La figure 3 montre une forme de réalisation de la présente invention. Elle consiste à interposer un élément autonome appelé racle capillaire à injection surfacique entre le réservoir constitué par la membrane souple 5 et l'ensemble 9 contenant le produit à transférer et le masque. La racle capillaire à injection surfacique est fixée sur l'ensemble 9 à l'aide des vis 17. La racle capillaire à injection surfacique intègre un élément capillaire constitué d'un profilé 13 élastiquement deformable par exemple du silicone RTV 71557 de Rhône Poulenc et d'une maille 12 fixée sur le profilé 13 et qui présente des orifices 14 d'alimentation de produit, uniformément repartis dans la zone de distribution 10, qui débouchent côté masque dans un lamage 11. La maille 12 a pour fonction de mettre en communication tous les orifices 14 et d'homogénéiser la pression du liquide à transférer sur toute la surface 10 du masque en regard avec le lamage. La trame de la maille 12 peut être ajustée en fonction de la viscosité du produit à transférer. On choisira une maille avec des taux d'ouvertures d'autant plus faible que le produit aura une viscosité faible. Dans tous les cas, l'ensemble des ouvertures 14 et de la maille 12 présente une résistance à l'écoulement (capillarité) suffisante afin que le produit ne puisse pas s'écouler librement du dispositif lorsque ce dernier est séparé du masque et que la force F2 est relâchée.Figure 3 shows an embodiment of the present invention. It consists of interposing an autonomous element called a capillary scraper with surface injection between the reservoir constituted by the flexible membrane 5 and the assembly 9 containing the product to be transferred and the mask. The surface injection capillary doctor blade is fixed to the assembly 9 using the screws 17. The surface injection capillary doctor blade integrates a capillary element consisting of an elastically deformable profile 13, for example RTV 71557 silicone from Rhône Poulenc and d 'a mesh 12 fixed to the profile 13 and which has orifices 14 for feeding the product, uniformly distributed in the distribution zone 10, which open on the mask side in a counterbore 11. The mesh 12 has the function of bringing all the orifices 14 and to homogenize the pressure of the liquid to be transferred over the entire surface 10 of the mask facing the counterbore. The weft of the mesh 12 can be adjusted as a function of the viscosity of the product to be transferred. We will choose a mesh with lower opening rates that the product will have a low viscosity. In all cases, all of the openings 14 and of the mesh 12 have sufficient flow resistance (capillarity) so that the product cannot flow freely from the device when the latter is separated from the mask and the force F2 is released.
L'ensemble des orifices 14 et le taux d'ouverture de la maille 12 doit permettre un débit de produit soumis à la pression dans le réservoir conforme à la vitesse de sérigraphie visée et à la nature du substrat à imprimer.The set of orifices 14 and the opening rate of the mesh 12 must allow a flow of product subjected to the pressure in the reservoir in accordance with the target screen printing speed and the nature of the substrate to be printed.
Sous l'action de la précontrainte FI, le profilé élastique s'écrase de telle sorte que les organes d'étanchéité 6a et 6b disposés autour de la surface de distribution 10 puissent se conformer aux variations de hauteurs et épouser le masque de façon intime afin d'éviter les fuites. Cet écrasement remplit également une autre fonction. En effet sous l'action de la précontrainte FI, le volume disponible à l'intérieur de la racle capillaire à injection surfacique et occupé par le produit 4, déterminé par les orifices 14 et le lamage 11, diminue et inversement augmente lorsque la précontrainte est relâchée comme ceci peut être le cas pendant un temps d'arrêt ou entre deux sérigraphies . Par conséquent dans ce dernier cas de figure, le produit qui se situe au niveau de la surface de distribution est ré-aspiré dans le réservoir et ainsi ne peut s'échapper du dispositif. Les matériaux des différentes pièces constitutives de la racle capillaire à injection surfacique peuvent être adaptés en fonction de l'application et de leur résistance chimique au produit à transférer. Ainsi, afin d'éviter une usure prématurée de l'écran ou de la maille 12 pour des écrans de sérigraphie à mailles en soie, en polyester ou en acier inoxydable, le choix de la maille 12 se portera de préférence sur une maille de même nature. Le profilé 13 est collé sur une plaque support 18 rigide qui ferme le réservoir et qui supporte le profilé 13 afin qu'il ne fléchisse pas en son milieu. La plaque 18 présente également des orifices de passage de produit 15 en regard des trous 14 dans le profilé 13. Le diamètre de ces orifices de passage de produit 15 est avantageusement calculé et adapté à la viscosité du produit ainsi qu'en adéquation avec la taille des cellules constituant l'élément capillaire.Under the action of the prestressing FI, the elastic profile is crushed so that the sealing members 6a and 6b arranged around the distribution surface 10 can conform to the variations in height and closely fit the mask so as to to avoid leaks. This overwriting also performs another function. In fact, under the action of the prestressing FI, the volume available inside the capillary scraper with surface injection and occupied by the product 4, determined by the orifices 14 and the countersinking, decreases and conversely increases when the prestressing is released as can be the case during a downtime or between two screen prints. Consequently, in the latter case, the product which is situated at the level of the dispensing surface is re-aspirated into the reservoir and thus cannot escape from the device. The materials of the various constituent parts of the surface injection capillary squeegee can be adapted according to the application and their chemical resistance to the product to be transferred. Thus, in order to avoid premature wear of the screen or of mesh 12 for silk-screen, silk or polyester or stainless steel screen screens, the choice of mesh 12 will preferably be carried out on a mesh of the same type. nature. The profile 13 is glued to a rigid support plate 18 which closes the reservoir and which supports the profile 13 so that it does not flex in the middle. The plate 18 also has product passage holes 15 opposite the holes 14 in the profile 13. The diameter of these product passage holes 15 is advantageously calculated and adapted to the viscosity of the product as well as in adequacy with the size. cells constituting the capillary element.
La figure 4 est une vue en perspective de la racle capillaire à injection surfacique évoquée en figure 3. Le lamage 11 qui contient la maille 12 ne s'étend pas sur toute la longueur de la racle capillaire à injection surfacique afin que le produit ne puisse pas s'échapper par les deux extrémités. Il est à noter que la racle capillaire à injection surfacique se présente comme un module indépendant qui peut se monter sur le réservoir d'un dispositif de transfert direct.FIG. 4 is a perspective view of the surface injection capillary doctor mentioned in FIG. 3. The counterbore 11 which contains the mesh 12 does not extend over the entire length of the surface injection capillary doctor so that the product cannot not escape from both ends. It should be noted that the surface injection capillary doctor blade is presented as an independent module which can be mounted on the reservoir of a direct transfer device.
En figure 5 est représentée en coupe une variante de réalisation possible du dispositif selon la présente invention. Dans le cas présent l'élément capillaire est constitué d'un profilé élastiquement deformable 16 en mousse à cellules ouvertes comme par exemple de la mousse polyuréthane qui présente à la fois une perméabilité suffisante pour que le débit du produit soit en adéquation avec le besoin de l'application lorsque l'on appuie avec la force F2 sur le piston 8 mais également une résistance à l'écoulement (capillarité) suffisante afin que le produit ne puisse s'écouler librement du dispositif lorsque celui-ci est séparé du masque et que la force F2 est relâchée. Comme dans le précédent mode de réalisation de l'invention, la racle capillaire à injection surfacique présente un volume occupé par le produit qui varie selon la précontrainte FI appliquée sur le dispositif de telle sorte que lorsque la pression est relâchée le produit qui se trouve aux alentours de la surface de distribution 10 est ré-aspiré à l'intérieur du dispositif. Le profilé en mousse occupe tout le volume compris entre les lèvres 6a et 6b et la plaque support 18.In Figure 5 is shown in section a possible alternative embodiment of the device according to the present invention. In the present case, the capillary element consists of an elastically deformable profile 16 made of open cell foam such as, for example, polyurethane foam which has both permeability sufficient for the product flow rate to be adequate for the need of the application when pressing with force F2 on the piston 8, but also sufficient flow resistance (capillarity) so that the product cannot flow freely from the device when it is separated from the mask and the force F2 is released. As in the previous embodiment of the invention, the capillary scraper with surface injection has a volume occupied by the product which varies according to the preload FI applied to the device so that when the pressure is released the product which is at the around the distribution surface 10 is re-aspirated inside the device. The foam profile occupies the entire volume between the lips 6a and 6b and the support plate 18.
En figure 6 est représentée une vue en perspective de la racle capillaire à injection surfacique telle que décrite en figure 5. La mousse à cellules ouvertes ne s'étend pas sur toute la longueur de la surface de distribution afin d'éviter les fuites latérales de produit. A chaque extrémité est disposé un profilé 19 en mousse a cellules fermées comme par exemple de la mousse silicone ou EPDM. Pour éviter tout risque de fuite de produit, les lèvres 6a et 6b ainsi que la plaque support 18 sont collées sur les profilés 19 ainsi la racle capillaire à injection surfacique constitue un module indépendant et interchangeable. L'interchangeabilité est particulièrement intéressante lorsque l'on souhaite changer de viscosité de produit ou de gamme de vitesse de sérigraphie, il suffit dans ce cas de changer la racle capillaire à injection surfacique en choisissant une mousse avec une dimension de cellules ouvertes adaptée au besoin de la nouvelle application. On peut également tirer avantageusement parti de l'interchangeabilité lors d'un nettoyage puisque celui-ci peut se faire en temps masqué si l'on dispose de deux racles capillaires à injection surfacique identiques.In FIG. 6 is shown a perspective view of the capillary scraper with surface injection as described in FIG. 5. The open cell foam does not extend over the entire length of the distribution surface in order to avoid lateral leaks from product. At each end is arranged a profile 19 of closed cell foam such as for example silicone foam or EPDM. To avoid any risk of product leakage, the lips 6a and 6b as well as the support plate 18 are bonded to the sections 19 so the capillary scraper with surface injection constitutes an independent and interchangeable module. Interchangeability is particularly advantageous when it is desired to change the viscosity of the product or the range of screen printing speed, in this case it suffices to change the capillary scraper with surface injection by choosing a foam with an open cell dimension adapted to the need. of the new application. Advantage can also be taken of interchangeability during cleaning since it can be done in masked time if two capillary injection scrapers are available identical surface.
Une autre façon d'assurer l'étanchéité à chaque extrémité de la racle capillaire à injection surfacique peut être réalisée en obturant les cellules ouvertes par exemple avec du silicone, qui peut être coulé dans la mousse afin de remplir les cellules, ainsi une seule mousse est nécessaire à la réalisation d'une racle à injection. Dans certains cas lorsque le masque et le profilé élastiquement deformable sont de nature différente et afin d'éviter une usure prématurée de la mousse ou du masque, il est possible d'interposer une maille entre le profilé et le masque de telle sorte que la friction du dispositif sur le masque se fasse entre deux matériaux de même nature . La racle capillaire à injection surfacique est en contact avec le masque sur toute la surface de la fente de distribution de telle manière que le produit ne puisse pas s'accumuler dans une poche qui risquerait de se vider sur le masque lors d'un temps d'arrêt ou lors d'une séparation du dispositif du masque.Another way of ensuring the sealing at each end of the surface injection capillary doctor blade can be carried out by sealing the open cells for example with silicone, which can be poured into the foam in order to fill the cells, thus a single foam. is necessary to make an injection doctor blade. In certain cases when the mask and the elastically deformable profile are of different nature and in order to avoid premature wear of the foam or the mask, it is possible to interpose a mesh between the profile and the mask so that the friction of the device on the mask is made between two materials of the same kind. The surface-injected capillary squeegee is in contact with the mask over the entire surface of the dispensing slot so that the product cannot accumulate in a pocket which would risk being emptied on the mask during a period of time. '' or when the device is removed from the mask.
Le dispositif selon l'invention est en conséquence, particulièrement adapté à la sérigraphie rotative ou plane de produits liquides à liquides visqueux sur toutes sortes de substrats . Fonctionnant de façon étanche, on évite toute interaction entre le produit et l'environnement extérieur, ce qui a pour conséquence d'augmenter la durée de vie des produits à transférer et à en limiter les pertes. Comme le produit est toujours en enceinte fermée, y compris lors des phases de séparation du dispositif du masque, les opérateurs n'y sont plus exposés ce qui améliore considérablement les conditions d'hygiène et de sécurité. De plus, pouvant agir de façon indépendante sur la poussée de transfert, il en découle donc que le débit de produit à travers la racle capillaire à injection surfacique devient ajustable c'est à dire qu'il devient désormais possible d'augmenter considérablement la vitesse de sérigraphie.The device according to the invention is therefore particularly suitable for rotary or flat screen printing of liquid products to viscous liquids on all kinds of substrates. Operating in a sealed manner, any interaction between the product and the external environment is avoided, which has the consequence of increasing the life of the products to be transferred and of limiting losses. As the product is always in a closed enclosure, including during the phases of separation of the device from the mask, operators are no longer exposed to it, which considerably improves health and safety conditions. In addition, being able to act independently on the transfer thrust, it therefore follows that the product flow rate through the capillary scraper with surface injection becomes adjustable, that is to say that it now becomes possible to increase considerably the speed of screen printing.
Le dispositif selon l'invention peut s'adapter sur des dispositifs existants. A titre d'exemple non limitatif, il peut s'adapter sur le dispositif PROFLOW qui est le nom commercial du produit qui fait l'objet de la demande de brevet FR 96.12671 ce qui a pour conséquence d'augmenter considérablement le champ d'application possible de ce produit. Cette invention va notamment s'appliquer à des secteurs industriels utilisant déjà la sérigraphie pour le dépôt de produits liquides : imprimerie, fabrication d'affiches, décoration (carrelages, émaux, textiles...), industrie du verre, automobile...The device according to the invention can be adapted to existing devices. By way of nonlimiting example, it can be adapted to the PROFLOW device which is the trade name of the product which is the subject of patent application FR 96.12671 which has the consequence of considerably increasing the field of application. possible of this product. This invention will in particular apply to industrial sectors already using screen printing for the deposition of liquid products: printing, manufacturing of posters, decoration (tiles, enamels, textiles ...), glass industry, automobile ...
Quel que soit l'équipement sur lequel la racle capillaire à injection surfacique est adaptée, le produit liquide est disposé dans un réservoir pressurisable ouvert du coté du masque par une surface de distribution de dimension adaptée à la largeur du substrat sur lequel le dépôt est à réaliser; le dit réservoir solidaire de la racle à injection surfacique est monté sur une machine de sérigraphie et conjointement à la mise sous pression du liquide, l'ensemble constitué du réservoir pressurisable et de la racle capillaire à injection surfacique sont soumis à un mouvement relatif de translation par rapport au masque et est appuyé sur ce dernier. Whatever the equipment on which the surface injection capillary doctor blade is adapted, the liquid product is placed in a pressurizable reservoir open on the side of the mask by a distribution surface of dimension adapted to the width of the substrate on which the deposit is achieve; the said reservoir integral with the surface injection doctor blade is mounted on a screen printing machine and jointly with the pressurization of the liquid, the assembly consisting of the pressurizable reservoir and the capillary surface injection doctor blade are subjected to a relative movement of translation relative to the mask and is pressed on the latter.

Claims

REVENDICATIONS
1) Racle capillaire à injection surfacique pour la réalisation de dépôts par sérigraphie d'un produit liquide à liquide visqueux sur un substrat à travers les ouvertures d'un masque reposant sur le dit substrat ; le produit liquide étant disposé dans un réservoir pressurisable ouvert du côté du masque par une surface de distribution de dimension adaptée à la largeur du substrat sur lequel le dépôt est à réaliser ; le dit réservoir solidaire de la racle capillaire à injection surfacique est monté sur une machine de sérigraphie et conjointement à la mise sous pression du liquide, l'ensemble réservoir plus racle capillaire à injection surfacique est soumis à un mouvement relatif de translation par rapport au masque et est appuyé sur ce dernier ; CARACTÉRISÉE PAR LE FAIT QUE la dite racle capillaire à injection surfacique s'interpose entre le dit réservoir et le dit masque à injection surfacique, intègre un élément capillaire (13 et 12 ou 16) et présente une résistance à l'écoulement plus ou moins importante de façon à empêcher l'écoulement du liquide du réservoir, lorsqu'il n'est pas sous pression et à le permettre, lorsqu'il est sous pression, la dite racle capillaire à injection surfacique étant fermée sur la partie avant et sur la partie arrière par des lèvres d'étanchéité (6a et 6b) inclinées en opposition qui viennent en contact avec le dit masque, la dite racle acceptant les déformations élastiques par l'intermédiaire de ses lèvres d'étanchéité (6a et 6b), contient un volume disponible de produit (4) qui, augmente lorsque l'on relâche l'appui sur la dite racle capillaire à injection surfacique et qui diminue lorsque l'on appuie sur la dite racle à injection.1) capillary squeegee with surface injection for producing deposits by screen printing of a liquid to viscous liquid product on a substrate through the openings of a mask resting on said substrate; the liquid product being placed in a pressurizable reservoir open on the side of the mask by a distribution surface of dimension adapted to the width of the substrate on which the deposit is to be made; the said reservoir integral with the surface injection capillary doctor blade is mounted on a screen printing machine and, in conjunction with the pressurization of the liquid, the reservoir plus surface injection capillary doctor blade assembly is subjected to a relative movement of translation relative to the mask and is pressed on it; CHARACTERIZED BY THE FACT THAT the said surface injection capillary doctor blade is interposed between the said reservoir and the said surface injection mask, incorporates a capillary element (13 and 12 or 16) and has a greater or lesser resistance to flow so as to prevent the flow of liquid from the reservoir, when it is not under pressure and to allow it, when it is under pressure, the said capillary scraper with surface injection being closed on the front part and on the part rear by sealing lips (6a and 6b) inclined in opposition which come into contact with said mask, said doctor blade accepting elastic deformations via its sealing lips (6a and 6b), contains a volume product available (4) which increases when the pressure on the said surface injection capillary doctor blade is released and which decreases when the said injection doctor blade is pressed.
2) Racle capillaire à injection surfacique selon la revendication 1, CARACTÉRISÉE PAR LE FAIT QUE le dit élément capillaire de la racle à injection surfacique est constitué d'un profilé élastiquement deformable (13) et d'une maille (12) .2) capillary squeegee with surface injection according to claim 1, characterized by the fact that said capillary element of the surface injection doctor blade consists of an elastically deformable profile (13) and a mesh (12).
3) Racle capillaire à injection surfacique selon la revendication 1, CARACTÉRISÉE PAR LE FAIT QUE le dit élément capillaire de la racle à injection surfacique est constitué par une mousse à cellules ouvertes élastiquement deformable.3) Capacitive squeegee with surface injection according to claim 1, CHARACTERIZED BY THE FACT THAT said capillary element of the surface injection doctor blade consists of an elastically deformable open cell foam.
4) Racle capillaire à injection surfacique selon la revendication 1, CARACTÉRISÉE PAR LE FAIT QUE l'ensemble des pièces constitutives de la dite racle est chimiquement inattaquable par le produit à sérigraphier (4) .4) Capacitive squeegee with surface injection according to claim 1, CHARACTERIZED BY THE FACT THAT all of the constituent parts of said doctor blade are chemically unassailable by the product to be screen printed (4).
5) Racle capillaire à injection surfacique selon la revendication 1, CARACTÉRISÉE PAR LE FAIT QUE le dit élément capillaire de la racle à injection surfacique est en contact avec le masque sur toute la surface d'injection (10) .5) Capacitive squeegee with surface injection according to claim 1, CHARACTERIZED BY THE FACT THAT said capillary element of the surface injection doctor blade is in contact with the mask over the entire injection surface (10).
6) Racle capillaire à injection surfacique selon la revendication 3, CARACTÉRISÉE PAR LE FAIT QUE la mousse à cellules ouvertes et élastiquement deformable est localement obturée aux deux extrémités avec du silicone.6) Capacitive squeegee with surface injection according to claim 3, CHARACTERIZED BY THE FACT THAT the open cell foam and elastically deformable is locally closed at both ends with silicone.
7) Racle capillaire à injection surfacique selon la revendication 3, CARACTÉRISÉE PAR LE FAIT QUE les organes d'étanchéité des deux extrémités de la racle capillaire à injection surfacique sont constitués par une mousse élastiquement deformable à cellules fermées.7) Surface injection capillary squeegee according to claim 3, CHARACTERIZED BY THE FACT THAT the sealing members of the two ends of the surface injection capillary doctor blade consist of an elastically deformable foam with closed cells.
8) Racle capillaire à injection surfacique selon l'ensemble des revendications 1 à 7, CARACTÉRISÉE PAR LE FAIT Qu'elle constitue un module indépendant pouvant être monté sur un dispositif de transfert comprenant un réservoir pressurisable.8) Capacitive squeegee with surface injection according to all of claims 1 to 7, CHARACTERIZED BY THE FACT It constitutes an independent module which can be mounted on a transfer device comprising a pressurizable reservoir.
9) Racle capillaire à injection surfacique selon les revendications 1, 2 et 3 prises ensemble, CARACTÉRISÉE PAR LE FAIT QUE les dites lèvres d'étanchéité (6a et 6b) venant en contact avec ledit masque et dont l'ouverture détermine la surface d'injection du produit (4) , acceptent des déformations élastiques et sont en liaison avec le dit élément capillaire (13 et 12 ou 6) de façon à faire évoluer son volume selon qu'on appuie ou non sur la dite racle capillaire.9) capillary squeegee with surface injection according to claims 1, 2 and 3 taken together, CHARACTERIZED BY THE FACT THAT said sealing lips (6a and 6b) coming into contact with said mask and the opening of which determines the surface of injection of the product (4), accept elastic deformations and are linked with said capillary element (13 and 12 or 6) so as to change its volume depending on whether or not pressing said capillary scraper.
10. Procédé de travail d'une racle capillaire à injection surfacique selon l'ensemble des revendications 1 à 9, CARACTÉRISÉ EN CE Qu'il consiste10. A method of working a surface injection capillary doctor blade according to all of claims 1 to 9, CHARACTERIZED IN THAT it consists
- à mettre en appui la dite racle sur le dit masque de façon à ce que les lèvres d'étanchéité (6a et 6b) assurent, de par leur liaison avec l'élément capillaire (13 et 12 ou 16) et de par leur élasticité, la réduction du volume de l'élément capillaire (13 et 12 ou 16), à mettre sous pression le produit (4) de façon à ce que ce dernier puisse passer à travers ledit élément capillaire- to press said doctor blade against said mask so that the sealing lips (6a and 6b) ensure, by their connection with the capillary element (13 and 12 or 16) and by their elasticity , reducing the volume of the capillary element (13 and 12 or 16), to pressurize the product (4) so that the latter can pass through said capillary element
(13 et 12 ou 16) , et à soumettre ladite racle à un mouvement relatif de translation par rapport au masque afin d'assurer la sérigraphie d'un substrat se trouvant sous le masque , puis(13 and 12 or 16), and subjecting said doctor blade to a relative translational movement with respect to the mask in order to ensure the screen printing of a substrate located under the mask, then
- à cesser le mouvement, à supprimer la pression sur le produit (4) de façon à ce que ce dernier ne passe plus par le dit élément capillaire (13 et 12 ou 16) , et à interrompre l'appui de ladite racle sur le dit masque de façon à ce que les lèvres d'étanchéité (6a et 6b) assurent, de par leur liaison avec l'élément capillaire (13 et 12 ou 16) et de par leur élasticité, l'augmentation du volume de l'élément capillaire (13 et 12 ou 16) afin que la dépression créée assure l'aspiration du produit (4) présent immédiatement au voisinage de la surface d'injection, lors de l'interruption de la sérigraphie. - to stop the movement, to remove the pressure on the product (4) so that the latter no longer passes through said capillary element (13 and 12 or 16), and to interrupt the pressing of said doctor blade on the said mask so that the sealing lips (6a and 6b) ensure, by their connection with the capillary element (13 and 12 or 16) and by their elasticity, the increase in the volume of the element capillary (13 and 12 or 16) so that the vacuum created ensures the suction of the product (4) present immediately in the vicinity of the injection surface, when the screen printing is interrupted.
EP99940274A 1998-09-03 1999-09-02 Capillary doctor blade with surface injection for liquid product screen printing and work method for said doctor blade Expired - Lifetime EP1109672B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9811005 1998-09-03
FR9811005A FR2782945B1 (en) 1998-09-03 1998-09-03 HAIR SCRAPER WITH SURFACE INJECTION FOR SCREENING OF LIQUID PRODUCTS
PCT/FR1999/002088 WO2000013904A1 (en) 1998-09-03 1999-09-02 Capillary doctor blade with surface injection for liquid product screen printing and work method for said doctor blade

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EP1109672A1 true EP1109672A1 (en) 2001-06-27
EP1109672B1 EP1109672B1 (en) 2010-12-15

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EP (1) EP1109672B1 (en)
JP (1) JP2002524310A (en)
AT (1) ATE491573T1 (en)
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Also Published As

Publication number Publication date
FR2782945A1 (en) 2000-03-10
JP2002524310A (en) 2002-08-06
US6588335B1 (en) 2003-07-08
FR2782945B1 (en) 2000-11-24
CA2342816A1 (en) 2000-03-16
DE69943046D1 (en) 2011-01-27
ATE491573T1 (en) 2011-01-15
AU5427899A (en) 2000-03-27
EP1109672B1 (en) 2010-12-15
WO2000013904A1 (en) 2000-03-16

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