EP0511883A1 - Screen printing method and device for printing a decorative layer on glass sheets - Google Patents

Screen printing method and device for printing a decorative layer on glass sheets Download PDF

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Publication number
EP0511883A1
EP0511883A1 EP92400727A EP92400727A EP0511883A1 EP 0511883 A1 EP0511883 A1 EP 0511883A1 EP 92400727 A EP92400727 A EP 92400727A EP 92400727 A EP92400727 A EP 92400727A EP 0511883 A1 EP0511883 A1 EP 0511883A1
Authority
EP
European Patent Office
Prior art keywords
screen
printing
glazing
ink
nozzle
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
EP92400727A
Other languages
German (de)
French (fr)
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EP0511883B1 (en
Inventor
Manfred Börger
Dieter Hahn
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.)
Vegla Vereinigte Glaswerke GmbH
Saint Gobain Vitrage SA
Original Assignee
Vegla Vereinigte Glaswerke GmbH
Saint Gobain Vitrage SA
Saint Gobain Vitrage International SA
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Publication date
Application filed by Vegla Vereinigte Glaswerke GmbH, Saint Gobain Vitrage SA, Saint Gobain Vitrage International SA filed Critical Vegla Vereinigte Glaswerke GmbH
Publication of EP0511883A1 publication Critical patent/EP0511883A1/en
Application granted granted Critical
Publication of EP0511883B1 publication Critical patent/EP0511883B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/12—Stencil printing; Silk-screen printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/26—Printing on other surfaces than ordinary paper
    • B41M1/34—Printing on other surfaces than ordinary paper on glass or ceramic surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B41F15/0804—Machines for printing sheets
    • B41F15/0813—Machines for printing sheets with flat screens
    • B41F15/0818—Machines for printing sheets with flat screens with a stationary screen and a moving squeegee

Definitions

  • the present invention relates to a method for applying a decorative layer to glazing by screen printing, according to which the decorative layer is applied at least in a selected area exactly up to the peripheral edge of the glazing. It also relates to devices for carrying out the process.
  • Automobile glazing is frequently provided, along an edge or all of its periphery, with a decorative layer made, as a general rule, of baking ink.
  • the decorative layer has, inter alia, the function of protecting against UV rays the adhesive layer by which the glazings are fixed in the frame.
  • Screen printing has proven to be particularly satisfactory for the application of the decorative layer on the surface of the glazing.
  • the screen printing ink is usually fired at temperatures of 550 to 600 ° C or more, during the heat treatment necessary for bending and / or tempering the glazing.
  • the panes when fitted, are no longer fitted with a profiled frame enclosing their edge or overlapping it, but are, on the contrary, visible from the outside to their edge.
  • Irregularities in the outer limit of the decorative layer in particular slightly different spacings between the outer limit of the decorative layer and the edge of the glazing, can be very troublesome.
  • the protection of the adhesive layer against UV rays is no longer ensured in the areas which are not coated with the decorative layer. Therefore, it is of great interest to apply the ink layer forming the decorative layer, by printing, in selected areas or along from the entire periphery of the glazing, exactly to the peripheral edge of this glazing.
  • glazing indeed has, as a general rule, certain permissible dimensional tolerances when they are all printed using a single screen printing screen.
  • the operations of positioning the glazing units to be printed and the printing tools are also linked to tolerances which are added, where appropriate, to the dimensional tolerances of the glazing unit.
  • the part of the screen which lets the ink pass extends beyond the edge of the glazing, the ink adheres to these places in the meshes of the screen or to the underside of the latter, which gives smudged prints during the following printing operations.
  • the application of ink, in screen printing is usually carried out only up to a certain distance from the edge of the glazing, which also takes into account the most unfavorable case.
  • the invention aims to develop the screen printing process in such a way that the printing of glazing by means of decorative layers going exactly to the peripheral edge can be carried out independently of the inevitable surface tolerances of the glazing and of the screen as well as of the positioning tolerances of the glazing and of the screen, without the screen and the peripheral faces of the glazing may be smeared with screen printing ink.
  • the process must be suitable for mass production of printed glazing.
  • this object is achieved by the fact that a screen printing screen with a printing surface extending beyond the edge of the glazing is used and which is extracted upwards out of the meshes of the screen, by pneumatic differential pressure, the printing ink which, during the printing operation, is present in the screen, outside the surface of the glazing.
  • the screen is designed in such a way that the printing surface extends beyond the edge of the glazing, even in the most unfavorable case of dimensional tolerances and conditions of positioning. This ensures that the ink is applied to the surface of the glazing, in any case up to the edge thereof.
  • the ink expelled through the mesh of the screen, outside the surface of the glazing is rendered harmless by the fact that it is entrained in a flow of air which flows from bottom to top, from so that the screen is free of ink, after the printing operation, also outside the surface of the glazing.
  • the air flow also prevents the peripheral faces of the glazing from being wetted by screen printing ink.
  • the pneumatic differential pressure outside the peripheral face of the glazing is produced by the fact that a static overpressure is created below the screen or that one allows to an air flow to act from below on the screen. This can be done at the same time as the printing operation or immediately after this, provided that the screen is still on the glazing.
  • the pneumatic differential pressure is produced by means of a nozzle which, after the scraping of the ink on the upper face of the screen, is passed over this screen.
  • the screen printing device illustrated in FIGS. 1 and 2 makes it possible to carry out the process according to the invention thanks to the fact that the screen, outside the glazing 1 to be printed, is kept free of ink or is freed from it by an overpressure acting by bottom on screen 2.
  • the glazing 1 is placed on a flat table 4.
  • the actual bearing surface 5 of the table 4 has the shape of the glazing 1 to be printed, but is, overall, smaller that glazing 1, so that this glazing 1 protrudes, all along from its periphery, from the bearing surface 5, a short distance A.
  • To the bearing surface 5 of the table is connected laterally a channel 6 delimited, on the outside, by a wall 7 which can be formed, for example, by a plate 8 extending the table top.
  • the peripheral face 9 of the glazing is arranged above the channel 6, during the printing operation.
  • a distribution channel 12 is mounted on the table top 4 and comprises supply tubes 13 which are connected to a fan. The air admitted by the supply tubes 13 flows inside the channel 6, vertically upwards.
  • the screen printing screen 2 has a printing surface 15, the external contour 16 of which is, overall, greater than the external contour of the glazing 1 formed by the peripheral face 9.
  • the protrusion B of the edge 9 of the glazing by the contour 16 of the printing surface 15 it has proved advantageous for the protrusion B of the edge 9 of the glazing by the contour 16 of the printing surface 15 to amount to a few millimeters.
  • the printing operation begins with the fact that the doctor blade 18 is pressed on the screen printing screen 2 and is pulled in the direction of the arrow F on this stencil screen 2, pressurized air is admitted through the supply tubes 13.
  • the air flow escaping vertically from the channel 6 sweeps the screen screen from below and prevents that, in the area of the printing surface protruding from the peripheral face 9 of the glazing, the printing ink comes down from the meshes of the screen.
  • the ink applied by printing on the surface of the glass is sucked from the top of the upper face of the screen printing screen.
  • the aspirated ink is collected in a container and can be reused after a corresponding preparation.
  • the screen printing device again comprises a flat table 20 on which the glazing 1 is placed with a corresponding positioning.
  • the serigraphic screen 2 fixed to the frame 3 again has a printing surface 15 whose outer contour 16 is located at a distance B outside the peripheral face 9 of the glazing 1 positioned.
  • the screen printing ink is applied by moving the doctor blade 21 in the direction of the arrow F, across the screen, on the surface of the glass.
  • the ink is also discharged into the zone of the screen printing screen located between the peripheral face 9 of the glazing and the external contour 16 of the printing surface 15, through the meshes of the screen .
  • the crevice nozzle 23 is guided in the same sense that the doctor blade 21 on the screen, the suction slot 24 of the slot nozzle being maintained at a distance of a few millimeters above the screen printing screen.
  • the posterior lip 25 of the slot nozzle 23 is longer than the anterior lip 26 and slides over the surface of the screen printing screen 2.
  • the length 1 of the slot nozzle 23 is less than the length L of the doctor blade 21, to guarantee that the screen printing ink is only sucked in the area in which the doctor blade 21 has scraped the ink on the screen.
  • the crevice nozzle 23 is advantageously mounted on the same support as that carrying the doctor blade 21, so that the doctor blade and the crevice nozzle are guided at the same time at a constant distance above the screen.
  • the slot nozzle 23 proper is connected to a collecting duct 27 which is in communication, via one or more pipes 28 and flexible pipes which are connected to it, with a suitable suction fan.
  • FIG. 5 A device, which has given satisfaction for the addition of diluent oil or solvent to the flow of aspirated air, is illustrated in FIG. 5.
  • a distribution duct 29 On the rear wall of the crevice nozzle 23, a little above the lip 25 of the nozzle which slides on the screen 2, a distribution duct 29 is provided which extends over the entire width of the nozzle slot.
  • the distribution duct 29 is provided a pipe 30 for supplying the diluent liquid.
  • the distribution duct 29 and the lip 25 of the slot nozzle are provided with a series of perforations 31 through which the diluent oil leaves the distribution duct 29 and is entrained by the flow of aspirated air.
  • the perforations 31 can be, for example, arranged at horizontal intervals of 10 to 30 mm and have a diameter of about 1 mm.
  • the volume of diluent oil can be adjusted by a throttle valve provided in the supply pipe 30.
  • diluent oil or solvent it is possible to use the liquids which serve as diluents for adjusting the viscosity of the ink.

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Surface Treatment Of Glass (AREA)
  • Finishing Walls (AREA)
  • Screen Printers (AREA)

Abstract

When a decorative layer is being applied to a glass sheet by screen printing, the printing surface of the printing screen (2) used extends beyond the peripheral face (9) of the glass sheet (1). The ink which, during the printing operation, is present in the apertures of the printing screen on the outside of the surface of the glass sheet is sucked up by means of a suction device (23) which is passed over the printing screen (2) behind the doctor (21). <IMAGE>

Description

La présente invention concerne un procédé pour appliquer une couche décorative sur un vitrage par sérigraphie, selon lequel la couche décorative est appliquée au moins dans un domaine sélectionné exactement jusqu'au bord périphérique du vitrage. Elle a trait, en outre, à des dispositifs pour l'exécution du procédé.The present invention relates to a method for applying a decorative layer to glazing by screen printing, according to which the decorative layer is applied at least in a selected area exactly up to the peripheral edge of the glazing. It also relates to devices for carrying out the process.

Des vitrages d'automobiles sont fréquemment pourvus, le long d'un bord ou de la totalité de leur pourtour, d'une couche décorative faite, en règle générale, d'une encre à cuire. La couche décorative a, entre autres, pour fonction de protéger contre les rayons UV la couche d'adhésif par laquelle les vitrages sont fixés dans le cadre. La sérigraphie s'est avérée particulièrement satisfaisante pour l'application de la couche décorative sur la surface du vitrage. L'encre sérigraphique est habituellement cuite à des températures de 550 à 600°C ou plus, au cours du traitement thermique nécessaire pour le bombage et/ou la trempe des vitrages.Automobile glazing is frequently provided, along an edge or all of its periphery, with a decorative layer made, as a general rule, of baking ink. The decorative layer has, inter alia, the function of protecting against UV rays the adhesive layer by which the glazings are fixed in the frame. Screen printing has proven to be particularly satisfactory for the application of the decorative layer on the surface of the glazing. The screen printing ink is usually fired at temperatures of 550 to 600 ° C or more, during the heat treatment necessary for bending and / or tempering the glazing.

Souvent, les vitrages, lorsqu'ils sont montés, ne sont plus garnis d'un encadrement en profilés enserrant leur bord ou le chevauchant, mais sont, au contraire, visibles de l'extérieur jusqu'à leur bord. Cela signifie que l'impression décorative marginale est également visible jusqu'au bord périphérique du vitrage. Des irrégularités de la limite extérieure de la couche décorative, en particulier des espacements légèrement différents entre la limite extérieure de la couche décorative et le bord du vitrage, peuvent s'avérer très gênantes. De plus, la protection de la couche d'adhésif contre les rayons UV n'est plus assurée dans les domaines qui ne sont pas revêtus de la couche décorative. C'est pourquoi, il est d'un grand intérêt d'appliquer la couche d'encre formant la couche décorative, par impression, dans des domaines sélectionnés ou le long de la totalité de la périphérie du vitrage, exactement jusqu'au bord périphérique de ce vitrage.Often, the panes, when fitted, are no longer fitted with a profiled frame enclosing their edge or overlapping it, but are, on the contrary, visible from the outside to their edge. This means that the marginal decorative impression is also visible up to the peripheral edge of the glazing. Irregularities in the outer limit of the decorative layer, in particular slightly different spacings between the outer limit of the decorative layer and the edge of the glazing, can be very troublesome. In addition, the protection of the adhesive layer against UV rays is no longer ensured in the areas which are not coated with the decorative layer. Therefore, it is of great interest to apply the ink layer forming the decorative layer, by printing, in selected areas or along from the entire periphery of the glazing, exactly to the peripheral edge of this glazing.

Dans les procédés d'impression traditionnels, en particulier en sérigraphie, il est, pour diverses raisons, difficile de réaliser une application précise de l'encre allant exactement jusqu'au bord du vitrage. D'une part, les vitrages présentent en effet, en règle générale, certaines tolérances dimensionnelles admissibles alors qu'ils sont tous imprimés à l'aide d'un seul et même écran sérigraphique. D'autre part, les opérations de positionnement des vitrages à imprimer et des outils d'impression sont également liées à des tolérances qui s'ajoutent, le cas échéant, aux tolérances dimensionnelles du vitrage. Lorsque la partie de l'écran qui laisse passer l'encre s'étend au-delà du bord du vitrage, l'encre adhère à ces endroits dans les mailles de l'écran ou à la face inférieure de ce dernier, ce qui donne des impressions maculées lors des opérations d'impression suivantes. Pour éviter cette difficulté, l'application de l'encre, en sérigraphie, ne s'effectue habituellement que jusqu'à une certaine distance du bord du vitrage, qui tient également compte du cas le plus défavorable.In traditional printing processes, in particular in screen printing, it is, for various reasons, difficult to achieve a precise application of the ink going exactly to the edge of the glazing. On the one hand, glazing indeed has, as a general rule, certain permissible dimensional tolerances when they are all printed using a single screen printing screen. On the other hand, the operations of positioning the glazing units to be printed and the printing tools are also linked to tolerances which are added, where appropriate, to the dimensional tolerances of the glazing unit. When the part of the screen which lets the ink pass extends beyond the edge of the glazing, the ink adheres to these places in the meshes of the screen or to the underside of the latter, which gives smudged prints during the following printing operations. To avoid this difficulty, the application of ink, in screen printing, is usually carried out only up to a certain distance from the edge of the glazing, which also takes into account the most unfavorable case.

Il est connu d'obtenir, par sérigraphie, une couche décorative s'étendant jusqu'au bord du vitrage, en adjoignant au vitrage des pochoirs complémentaires de la forme du vitrage et en procédant à l'application de l'encre au-delà du bord du vitrage jusque sur les surfaces des pochoirs qui sont ensuite enlevées du vitrage (document US-A 4 268 545). Lors de l'enlèvement des pochoirs du bord du vitrage, l'encre n'est cependant pas encore sèche et la face périphérique du vitrage peut être souillée. De plus, l'encre sérigraphique présente sur les pochoirs n'est pas encore sèche lors de l'opération d'impression suivante et passe sur la face inférieure de l'écran sérigraphique.It is known to obtain, by screen printing, a decorative layer extending to the edge of the glazing, by adding to the glazing stencils complementary to the shape of the glazing and by applying the ink beyond the edge of the glazing up to the surfaces of the stencils which are then removed from the glazing (document US-A 4,268,545). When removing the stencils from the edge of the glazing, the ink is not yet dry and the peripheral face of the glazing can be soiled. In addition, the screen printing ink present on the stencils is not yet dry during the next printing operation and passes over the underside of the screen printing screen.

L'invention a pour but de développer le procédé sérigraphique d'une manière telle que l'impression de vitrages au moyen de couches décoratives allant exactement jusqu'au bord périphérique puisse s'effectuer indépendamment des tolérances de surface inévitables des vitrages et de l'écran ainsi que des tolérances de positionnement des vitrages et de l'écran, sans que l'écran et les faces périphériques des vitrages risquent d'être maculés par l'encre sérigraphique. Le procédé doit se prêter à la fabrication en série de vitrages imprimés.The invention aims to develop the screen printing process in such a way that the printing of glazing by means of decorative layers going exactly to the peripheral edge can be carried out independently of the inevitable surface tolerances of the glazing and of the screen as well as of the positioning tolerances of the glazing and of the screen, without the screen and the peripheral faces of the glazing may be smeared with screen printing ink. The process must be suitable for mass production of printed glazing.

Suivant l'invention, ce but est réalisé par le fait qu'on utilise un écran sérigraphique à surface d'impression s'étendant au-delà du bord du vitrage et qu'on extrait vers le haut hors des mailles de l'écran, par une pression différentielle pneumatique, l'encre d'impression qui, pendant l'opération d'impression, est présente dans l'écran, à l'extérieur de la surface du vitrage.According to the invention, this object is achieved by the fact that a screen printing screen with a printing surface extending beyond the edge of the glazing is used and which is extracted upwards out of the meshes of the screen, by pneumatic differential pressure, the printing ink which, during the printing operation, is present in the screen, outside the surface of the glazing.

Dans le procédé conforme à l'invention, l'écran est conçu d'une manière telle que la surface d'impression s'étende au-delà du bord du vitrage, même dans le cas le plus défavorable des tolérances dimensionnelles et des conditions de positionnement. Ceci assure que l'encre soit appliquée sur la surface du vitrage, en tout cas jusqu'au bord de celui-ci. L'encre refoulée à travers les mailles de l'écran, à l'extérieur de la surface du vitrage, est rendue inoffensive par le fait qu'elle est entraînée dans un flux d'air qui s'écoule de bas en haut, de sorte que l'écran est débarrassé de l'encre, après l'opération d'impression, également à l'extérieur de la surface du vitrage. Le flux d'air empêche également les faces périphériques des vitrages d'être mouillées par l'encre sérigraphique.In the process according to the invention, the screen is designed in such a way that the printing surface extends beyond the edge of the glazing, even in the most unfavorable case of dimensional tolerances and conditions of positioning. This ensures that the ink is applied to the surface of the glazing, in any case up to the edge thereof. The ink expelled through the mesh of the screen, outside the surface of the glazing, is rendered harmless by the fact that it is entrained in a flow of air which flows from bottom to top, from so that the screen is free of ink, after the printing operation, also outside the surface of the glazing. The air flow also prevents the peripheral faces of the glazing from being wetted by screen printing ink.

Selon une première forme de réalisation de l'invention, la pression différentielle pneumatique à l'extérieur de la face périphérique du vitrage est produite par le fait que l'on crée une surpression statique en dessous de l'écran ou que l'on permet à un flux d'air d'agir par le bas sur l'écran. Ceci peut s'effectuer en même temps que l'opération d'impression ou immédiatement après celle-ci, pour autant que l'écran se trouve encore sur le vitrage.According to a first embodiment of the invention, the pneumatic differential pressure outside the peripheral face of the glazing is produced by the fact that a static overpressure is created below the screen or that one allows to an air flow to act from below on the screen. This can be done at the same time as the printing operation or immediately after this, provided that the screen is still on the glazing.

Selon une forme de réalisation préférée, la pression différentielle pneumatique est produite au moyen d'un suceur qui, après le raclage de l'encre sur la face supérieure de l'écran, est passé sur cet écran.According to a preferred embodiment, the pneumatic differential pressure is produced by means of a nozzle which, after the scraping of the ink on the upper face of the screen, is passed over this screen.

D'autres avantages et d'autres réalisations et développements avantageux de l'invention ressortiront des revendications dépendantes et de la description suivante de deux exemples de réalisation, donnée avec référence aux dessins annexés, dans lesquels :

  • la Fig. 1 est une vue en coupe verticale, dans la zone marginale du vitrage, d'un dispositif sérigraphique pourvu d'un chenal de surpression, dans la table d'appui, dans le domaine de la périphérie du vitrage;
  • la Fig. 2 est une vue en plan du dispositif illustré sur la Fig. 1;
  • la Fig. 3 est une vue en coupe verticale, dans la zone périphérique du vitrage, d'un dispositif sérigraphique pourvu d'un suceur agissant par le haut sur l'écran;
  • la Fig. 4 est une vue en plan du dispositif illustré sur la Fig. 3, et
  • la Fig. 5 est une vue, à plus grande échelle, de la zone de l'embouchure d'un suceur équipé d'un dispositif destiné à débiter un liquide diluant.
Other advantages and other advantageous embodiments and developments of the invention will emerge from the dependent claims and from the following description of two exemplary embodiments, given with reference to the appended drawings, in which:
  • Fig. 1 is a view in vertical section, in the marginal zone of the glazing, of a screen printing device provided with an overpressure channel, in the support table, in the area of the periphery of the glazing;
  • Fig. 2 is a plan view of the device illustrated in FIG. 1;
  • Fig. 3 is a view in vertical section, in the peripheral zone of the glazing, of a screen printing device provided with a nozzle acting from above on the screen;
  • Fig. 4 is a plan view of the device illustrated in FIG. 3, and
  • Fig. 5 is a view, on a larger scale, of the area of the mouth of a nozzle provided with a device intended to deliver a diluent liquid.

Le dispositif sérigraphique illustré sur les Fig. 1 et 2 permet d'exécuter le procédé conforme à l'invention grâce au fait que l'écran, à l'extérieur du vitrage 1 à imprimer, est maintenu dépourvu d'encre ou est débarrassé de celle-ci par une surpression agissant par le bas sur l'écran 2.The screen printing device illustrated in FIGS. 1 and 2 makes it possible to carry out the process according to the invention thanks to the fact that the screen, outside the glazing 1 to be printed, is kept free of ink or is freed from it by an overpressure acting by bottom on screen 2.

Pendant l'opération d'impression, le vitrage 1 est posé sur une table plane 4. La surface d'appui proprement dite 5 de la table 4 a la forme du vitrage 1 à imprimer, mais est, dans l'ensemble, plus petite que le vitrage 1, de sorte que ce vitrage 1 dépasse, tout le long de sa périphérie, de la surface d'appui 5, d'une courte distance A. A la surface d'appui 5 de la table se raccorde latéralement un chenal 6 délimité, du côté extérieur, par une paroi 7 qui peut être formée, par exemple, par une plaque 8 prolongeant le plateau de la table. La face périphérique 9 du vitrage est disposée au-dessus du chenal 6, pendant l'opération d'impression.During the printing operation, the glazing 1 is placed on a flat table 4. The actual bearing surface 5 of the table 4 has the shape of the glazing 1 to be printed, but is, overall, smaller that glazing 1, so that this glazing 1 protrudes, all along from its periphery, from the bearing surface 5, a short distance A. To the bearing surface 5 of the table is connected laterally a channel 6 delimited, on the outside, by a wall 7 which can be formed, for example, by a plate 8 extending the table top. The peripheral face 9 of the glazing is arranged above the channel 6, during the printing operation.

En dessous du chenal 6, un chenal de distribution 12 est monté sur le plateau 4 de la table et comporte des tubes d'alimentation 13 qui sont raccordés à un ventilateur. L'air admis par les tubes d'alimentation 13 s'écoule à l'intérieur du chenal 6, verticalement vers le haut.Below the channel 6, a distribution channel 12 is mounted on the table top 4 and comprises supply tubes 13 which are connected to a fan. The air admitted by the supply tubes 13 flows inside the channel 6, vertically upwards.

L'écran sérigraphique 2 présente une surface d'impression 15 dont le contour extérieur 16 est, dans l'ensemble, plus grand que le contour extérieur du vitrage 1 formé par la face périphérique 9. Dans le cas des tolérances et des conditions usuelles du procédé, il s'est avéré avantageux que le dépassement B du bord 9 du vitrage par le contour 16 de la surface d'impression 15 s'élève à quelques millimètres.The screen printing screen 2 has a printing surface 15, the external contour 16 of which is, overall, greater than the external contour of the glazing 1 formed by the peripheral face 9. In the case of the tolerances and the usual conditions of method, it has proved advantageous for the protrusion B of the edge 9 of the glazing by the contour 16 of the printing surface 15 to amount to a few millimeters.

Dès qu'après l'abaissement de l'écran sérigraphique 2 fixé au cadre 3, l'opération d'impression débute par le fait que la racle 18 est pressée sur l'écran sérigraphique 2 et est tirée dans le sens de la flèche F sur cet écran pochoir 2, de l'air sous pression est admis par les tubes d'alimentation 13. Le flux d'air s'échappant verticalement du chenal 6 balaie l'écran sérigraphique par le bas et empêche que, dans la zone de la surface d'impression dépassant la face périphérique 9 du vitrage, l'encre d'impression sorte vers le bas des mailles de l'écran.As soon as after the lowering of the screen printing screen 2 fixed to the frame 3, the printing operation begins with the fact that the doctor blade 18 is pressed on the screen printing screen 2 and is pulled in the direction of the arrow F on this stencil screen 2, pressurized air is admitted through the supply tubes 13. The air flow escaping vertically from the channel 6 sweeps the screen screen from below and prevents that, in the area of the printing surface protruding from the peripheral face 9 of the glazing, the printing ink comes down from the meshes of the screen.

Dans des cas dans lesquels il n'est pas question d'imprimer un cadre décoratif fermé sur le vitrage, mais uniquement, par exemple, une bande décorative le long d'un bord du vitrage, les mesures décrites ne doivent bien entendu être prises que dans le domaine en question dans lequel cette bande décorative doit s'étendre exactement jusqu'au bord du vitrage.In cases where it is not a question of printing a closed decorative frame on the glazing, but only, for example, a decorative strip along an edge of the glazing, the measures described should of course only be taken in the area in question in which this decorative strip must extend exactly to the edge of the glazing.

Dans l'exemple de réalisation illustré sur les Fig. 3 à 5, l'encre appliquée par impression sur la surface du verre est aspirée par le haut de la face supérieure de l'écran sérigraphique. L'encre aspirée est recueillie dans un récipient et peut être réutilisée après une préparation correspondante.In the exemplary embodiment illustrated in FIGS. 3 to 5, the ink applied by printing on the surface of the glass is sucked from the top of the upper face of the screen printing screen. The aspirated ink is collected in a container and can be reused after a corresponding preparation.

Le dispositif sérigraphique comprend à nouveau une table plane 20 sur laquelle le vitrage 1 est posé avec un positionnement correspondant. L'écran sérigraphique 2 fixé au cadre 3 présente à nouveau une surface d'impression 15 dont le contour extérieur 16 est situé à une distance B à l'extérieur de la face périphérique 9 du vitrage 1 positionné. A l'aide de la racle 21, l'encre sérigraphique est appliquée par un déplacement de la racle 21 dans le sens de la flèche F, à travers l'écran, sur la surface du verre.The screen printing device again comprises a flat table 20 on which the glazing 1 is placed with a corresponding positioning. The serigraphic screen 2 fixed to the frame 3 again has a printing surface 15 whose outer contour 16 is located at a distance B outside the peripheral face 9 of the glazing 1 positioned. Using the doctor blade 21, the screen printing ink is applied by moving the doctor blade 21 in the direction of the arrow F, across the screen, on the surface of the glass.

Au moyen de la racle 21, l'encre est refoulée également dans la zone de l'écran sérigraphique située entre la face périphérique 9 du vitrage et le contour extérieur 16 de la surface d'impression 15, à travers les mailles de l'écran. L'encre qui se trouve dans cette zone, à l'intérieur des mailles de l'écran sérigraphique, et qui adhère en dessous de cet écran, est aspirée par un suceur à fente 23. Le suceur à fente 23 est guidé dans le même sens que la racle 21 sur l'écran, la fente d'aspiration 24 du suceur à fente étant maintenue à une distance de quelques millimètres au-dessus de l'écran sérigraphique. La lèvre postérieure 25 du suceur à fente 23 est plus longue que la lèvre antérieure 26 et glisse sur la surface de l'écran sérigraphique 2. La longueur 1 du suceur à fente 23 est inférieure à la longueur L de la racle 21, pour garantir que l'encre sérigraphique ne soit aspirée que dans la zone dans laquelle la racle 21 a raclé l'encre sur l'écran.By means of the doctor blade 21, the ink is also discharged into the zone of the screen printing screen located between the peripheral face 9 of the glazing and the external contour 16 of the printing surface 15, through the meshes of the screen . The ink which is in this zone, inside the meshes of the screen-printing screen, and which adheres below this screen, is sucked up by a crevice nozzle 23. The crevice nozzle 23 is guided in the same sense that the doctor blade 21 on the screen, the suction slot 24 of the slot nozzle being maintained at a distance of a few millimeters above the screen printing screen. The posterior lip 25 of the slot nozzle 23 is longer than the anterior lip 26 and slides over the surface of the screen printing screen 2. The length 1 of the slot nozzle 23 is less than the length L of the doctor blade 21, to guarantee that the screen printing ink is only sucked in the area in which the doctor blade 21 has scraped the ink on the screen.

Le suceur à fente 23 est avantageusement monté sur le même support que celui portant la racle 21, de sorte que la racle et le suceur à fente sont guidés en même temps à une distance constante au-dessus de l'écran. Le suceur à fente 23 proprement dit se raccorde à un conduit collecteur 27 qui est en communication, par l'intermédiaire d'une ou de plusieurs tubulures 28 et de tuyaux flexibles qui s'y raccordent, avec un ventilateur aspirant approprié.The crevice nozzle 23 is advantageously mounted on the same support as that carrying the doctor blade 21, so that the doctor blade and the crevice nozzle are guided at the same time at a constant distance above the screen. The slot nozzle 23 proper is connected to a collecting duct 27 which is in communication, via one or more pipes 28 and flexible pipes which are connected to it, with a suitable suction fan.

Sous l'influence du flux d'air aspiré, les solvants ou les huiles diluantes des encres s'évaporent très rapidement. Ceci peut avoir pour conséquence que la viscosité de l'encre augmente rapidement dans le flux d'air aspiré et que les résidus d'encre séchés se fixent sur les parois internes du suceur à fente. De ce fait, au cours du temps, la section transversale du suceur à fente se rétrécit et la puissance d'aspiration du suceur à fente diminue, de sorte qu'une élimination complète des résidus d'encre de l'écran sérigraphique en est rendue plus difficile.Under the influence of the air flow sucked in, the solvents or diluting oils in the inks evaporate very quickly. This can have the consequence that the viscosity of the ink increases rapidly in the suction air flow and that the dried ink residues become fixed on the internal walls of the crevice nozzle. As a result, over time, the cross section of the slit nozzle is reduced and the suction power of the slit nozzle decreases, so that complete removal of ink residues from the screen screen is made. more difficult.

Pour empêcher les résidus d'encre de sécher et de se fixer à l'intérieur du suceur à fente, au cours de l'opération d'aspiration, une huile diluante ou un solvant est ajouté en faible quantité directement dans le flux d'air aspiré. Ceci non seulement permet d'éviter que les résidus d'encre se déposent à l'intérieur du suceur, mais, en outre, liquéfie à nouveau les résidus d'encre déjà séchés à l'intérieur du suceur à fente et permet leur aspiration. Lors de l'addition d'une huile diluante ou d'un solvant au flux d'air aspiré, il faut cependant veiller à ce que la surface de l'écran sérigraphique n'entre pas en contact avec l'huile diluante ou le solvant. Sinon, l'encre subira des modifications indésirables.To prevent ink residue from drying out and becoming fixed inside the crevice nozzle, during the suction operation, a thinning oil or solvent is added in small quantities directly into the air flow sucked. This not only makes it possible to prevent ink residues from settling inside the nozzle, but, in addition, again liquefies the ink residues already dried inside the slot nozzle and allows them to be suctioned out. However, when adding a diluent oil or a solvent to the suction air flow, care must be taken that the surface of the screen printing screen does not come into contact with the diluent oil or the solvent. . Otherwise, the ink will undergo unwanted changes.

Un dispositif, qui a donné satisfaction pour l'addition d'huile diluante ou de solvant au flux d'air aspiré, est illustré sur la Fig. 5. Sur la paroi postérieure du suceur à fente 23, un peu au-dessus de la lèvre 25 du suceur qui glisse sur l'écran sérigraphique 2, est prévu un conduit de distribution 29 qui s'étend sur toute la largeur du suceur à fente. Le conduit de distribution 29 est pourvu d'un tuyau 30 pour l'alimentation du liquide diluant. Le conduit de distribution 29 et la lèvre 25 du suceur à fente sont pourvus d'une série de perforations 31 par lesquelles l'huile diluante sort du conduit de distribution 29 et est entraînée par le flux d'air aspiré. Les perforations 31 peuvent être, par exemple, disposées à des intervalles horizontaux de 10 à 30 mm et ont un diamètre d'environ 1 mm. Le volume d'huile diluante peut être réglé par une valve étrangleuse prévue dans le tuyau d'alimentation 30. A titre d'huile diluante ou de solvant, on peut utiliser les liquides qui servent de diluants pour le réglage de la viscosité de l'encre.A device, which has given satisfaction for the addition of diluent oil or solvent to the flow of aspirated air, is illustrated in FIG. 5. On the rear wall of the crevice nozzle 23, a little above the lip 25 of the nozzle which slides on the screen 2, a distribution duct 29 is provided which extends over the entire width of the nozzle slot. The distribution duct 29 is provided a pipe 30 for supplying the diluent liquid. The distribution duct 29 and the lip 25 of the slot nozzle are provided with a series of perforations 31 through which the diluent oil leaves the distribution duct 29 and is entrained by the flow of aspirated air. The perforations 31 can be, for example, arranged at horizontal intervals of 10 to 30 mm and have a diameter of about 1 mm. The volume of diluent oil can be adjusted by a throttle valve provided in the supply pipe 30. As diluent oil or solvent, it is possible to use the liquids which serve as diluents for adjusting the viscosity of the ink.

Claims (10)

1.- Procédé pour appliquer une couche décorative sur un vitrage par sérigraphie, suivant lequel la couche décorative est appliquée au moins dans un domaine sélectionné exactement jusqu'au bord périphérique du vitrage, caractérisé en ce qu'on utilise un écran sérigraphique (2) à surface d'impression (15) s'étendant jusqu'au-delà du bord (9) du vitrage et qu'on extrait vers le haut, hors des mailles de l'écran, par une pression différentielle pneumatique, l'encre d'impression qui, pendant l'opération d'impression, est présente dans l'écran, à l'extérieur de la surface du vitrage. 1.- Method for applying a decorative layer on a glazing by screen printing, according to which the decorative layer is applied at least in a selected area exactly up to the peripheral edge of the glazing, characterized in that a screen printing screen (2) is used with a printing surface (15) extending beyond the edge (9) of the glazing and which is extracted upwards, out of the meshes of the screen, by pneumatic differential pressure, the ink d printing which, during the printing operation, is present on the screen, outside the surface of the glazing. 2.- Procédé suivant la revendication 1, caractérisé en ce que, à côté de la face périphérique (9) du vitrage (1), en dessous de l'écran sérigraphique (2), un flux d'air est dirigé du bas sur la surface d'impression (15) de l'écran (2). 2.- Method according to claim 1, characterized in that, next to the peripheral face (9) of the glazing (1), below the screen printing screen (2), an air flow is directed from below to the printing surface (15) of the screen (2). 3.- Procédé suivant la revendication 1, caractérisé en ce que l'encre présente dans la surface d'impression (15), à l'extérieur de la surface du vitrage, est aspirée au niveau de la face supérieure de l'écran sérigraphique (2). 3.- Method according to claim 1, characterized in that the ink present in the printing surface (15), outside the glazing surface, is sucked at the upper face of the screen printing screen (2). 4.- Procédé suivant la revendication 3, caractérisé en ce que, lors de l'opération d'impression ou immédiatement après celle-ci, un suceur (23) est passé sur la surface d'impression (15) de l'écran sérigraphique (2). 4.- Method according to claim 3, characterized in that, during the printing operation or immediately after it, a nozzle (23) is passed over the printing surface (15) of the screen printing screen (2). 5.- Procédé suivant la revendication 4, caractérisé en ce que, lors de l'opération d'impression, un suceur à fente (23) est passé sur l'écran sérigraphique (2) derrière la racle d'impression (21) et parallèlement à celle-ci. 5.- Method according to claim 4, characterized in that, during the printing operation, a crevice nozzle (23) is passed over the screen printing screen (2) behind the printing doctor blade (21) and parallel to it. 6.- Procédé suivant l'une quelconque des revendications 3 à 5, caractérisé en ce qu'un diluant ou un solvant pour l'encre est introduit dans le flux d'air aspiré. 6.- Method according to any one of claims 3 to 5, characterized in that a diluent or a solvent for the ink is introduced into the flow of aspirated air. 7.- Dispositif pour l'éxécution du procédé suivant la revendication 2, caractérisé en ce que la table (4) recevant le vitrage (1), pendant l'opération d'impression, présente, dans la zone de la face périphérique (9) du vitrage (1), un creux en forme de chenal (6), qui par l'intermédiaire d'un chenal de distribution (12) et de conduites (13), peut être raccordé à une source de pression. 7.- Device for carrying out the method according to claim 2, characterized in that the table (4) receiving the glazing (1), during the printing operation, present, in the region of the peripheral face (9 ) of the glazing (1), a channel-shaped hollow (6), which via a distribution channel (12) and pipes (13), can be connected to a pressure source. 8.- Dispositif pour l'exécution du procédé suivant les revendications 4 et 5, caractérisé en ce qu'à la racle d'impression (21) du dispositif sérigraphique est accouplé, en vue de participer à ses déplacements, un suceur à fente (23) parallèle à cette racle. 8.- Device for carrying out the method according to claims 4 and 5, characterized in that the printing doctor blade (21) of the screen printing device is coupled, in order to participate in its movements, a crevice nozzle ( 23) parallel to this doctor blade. 9.- Dispositif suivant la revendication 8, caractérisé en ce que le suceur aspirant à fente (23) présente une extension longitudinale inférieure à celle de la racle (21).9.- Device according to claim 8, characterized in that the crevice suction nozzle (23) has a longitudinal extension less than that of the doctor blade (21). 10.- Dispositif pour l'exécution du procédé suivant la revendication 7, caractérisé par un suceur (23) pourvu d'un conduit de distribution (29) qui est en communication par des perforations (31) avec la fente d'aspiration (24) et qui est pourvu d'un tuyau d'alimentation (30) pour une huile diluante ou un solvant. 10.- Device for carrying out the method according to claim 7, characterized by a nozzle (23) provided with a distribution duct (29) which is in communication by perforations (31) with the suction slot (24 ) and which is provided with a supply pipe (30) for a diluent oil or a solvent.
EP92400727A 1991-03-23 1992-03-19 Screen printing method and device for printing a decorative layer on glass sheets Expired - Lifetime EP0511883B1 (en)

Applications Claiming Priority (2)

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DE4109707 1991-03-23
DE4109707A DE4109707C1 (en) 1991-03-23 1991-03-23

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EP (1) EP0511883B1 (en)
JP (1) JP3149981B2 (en)
KR (1) KR100195777B1 (en)
AT (1) ATE124335T1 (en)
BR (1) BR9200989A (en)
CA (1) CA2063302C (en)
DE (2) DE4109707C1 (en)
DK (1) DK0511883T3 (en)
ES (1) ES2076702T3 (en)

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EP0628410A1 (en) * 1993-05-28 1994-12-14 ASCO SCREEN PRODUCTS S.r.l. Apparatus and method for silk screen or screen printing around the edge of an object of a rigid material
EP0642923A1 (en) * 1993-09-14 1995-03-15 Calcar S.A. Silk-screen printing machine with automatic suction device for the removal of ink residue
EP0901904A1 (en) * 1997-09-05 1999-03-17 Ianua S.p.A Screen printing machine with improved device for aspirating excess ink
FR2871099A1 (en) 2004-06-04 2005-12-09 Saint Gobain METHOD AND DEVICE FOR PRINTING DECORS ON SUBSTRATES
WO2006070188A1 (en) 2004-12-29 2006-07-06 Pilkington Group Limited Glazing
CN103395309A (en) * 2013-07-04 2013-11-20 广东星星光电科技有限公司 Mobile phone cover glass main printing technology

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JP3295274B2 (en) * 1994-05-16 2002-06-24 キヤノン株式会社 Screen printing machine, screen printing method, method of manufacturing image forming apparatus using the method, and image forming apparatus obtained by using the manufacturing method
US5509964A (en) * 1994-08-25 1996-04-23 Ford Motor Company Apparatus and method for applying a coating to glass using a screen printing process
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US5876498A (en) * 1996-12-20 1999-03-02 Moms, Inc. Apparatus for preserving solder paste in the manufacturing of printed circuit board assemblies
DE19832414C2 (en) * 1998-07-18 2000-07-20 Rob Borgmann Screen printing method for printing flat objects, in particular glass panes, with a decor and device for carrying out the method
JP3292194B2 (en) * 2000-02-01 2002-06-17 松下電器産業株式会社 Printing plate and printing method using the same
WO2014012700A1 (en) 2012-07-16 2014-01-23 Saint-Gobain Glass France Screen printing device for applying an ink
US9567258B2 (en) * 2013-03-12 2017-02-14 Guardian Industries Corp. Picture frame with glass mat, and/or method of making the same
CN103522825B (en) * 2013-10-18 2016-02-03 广东星弛光电科技有限公司 A kind of 3Dlogo preparation technology of sight glass protecting screen
CN104553408A (en) * 2014-02-05 2015-04-29 北京智膜科技有限公司 Manufacture method of transparent induction film material
CN106313924A (en) * 2015-06-16 2017-01-11 蓝思科技（长沙）有限公司 Method for forming ink layer on surface of non-flat-plate glass
CN110843323B (en) * 2019-11-27 2023-11-21 海控三鑫(蚌埠)新能源材料有限公司 Online cleaning device for screen printing screen ink blocking
CN113060944A (en) * 2021-03-25 2021-07-02 肥西常福中空玻璃厂 Glass deinking equipment
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Cited By (9)

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Publication number Priority date Publication date Assignee Title
EP0628410A1 (en) * 1993-05-28 1994-12-14 ASCO SCREEN PRODUCTS S.r.l. Apparatus and method for silk screen or screen printing around the edge of an object of a rigid material
EP0642923A1 (en) * 1993-09-14 1995-03-15 Calcar S.A. Silk-screen printing machine with automatic suction device for the removal of ink residue
EP0901904A1 (en) * 1997-09-05 1999-03-17 Ianua S.p.A Screen printing machine with improved device for aspirating excess ink
US6186063B1 (en) 1997-09-05 2001-02-13 Ianua S.P.A. Screen printing machine with improved device for aspirating excess ink
FR2871099A1 (en) 2004-06-04 2005-12-09 Saint Gobain METHOD AND DEVICE FOR PRINTING DECORS ON SUBSTRATES
WO2005123389A1 (en) 2004-06-04 2005-12-29 Saint-Gobain Glass France Method and device for printing decorative elements on substrates
WO2006070188A1 (en) 2004-12-29 2006-07-06 Pilkington Group Limited Glazing
CN103395309A (en) * 2013-07-04 2013-11-20 广东星星光电科技有限公司 Mobile phone cover glass main printing technology
CN103395309B (en) * 2013-07-04 2016-02-03 广东星弛光电科技有限公司 A kind of main body typography of mobile phone glass

Also Published As

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KR920017841A (en) 1992-10-21
DK0511883T3 (en) 1995-10-09
KR100195777B1 (en) 1999-06-15
CA2063302C (en) 2002-08-13
JP3149981B2 (en) 2001-03-26
DE4109707C1 (en) 1992-10-22
US5273780A (en) 1993-12-28
CA2063302A1 (en) 1992-09-24
JPH0570180A (en) 1993-03-23
EP0511883B1 (en) 1995-06-28
ATE124335T1 (en) 1995-07-15
ES2076702T3 (en) 1995-11-01
DE69203147D1 (en) 1995-08-03
DE69203147T2 (en) 1996-02-15
BR9200989A (en) 1992-11-24

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