EP1755893A1 - Method and device for printing decorative elements on substrates - Google Patents

Method and device for printing decorative elements on substrates

Info

Publication number
EP1755893A1
EP1755893A1 EP05776426A EP05776426A EP1755893A1 EP 1755893 A1 EP1755893 A1 EP 1755893A1 EP 05776426 A EP05776426 A EP 05776426A EP 05776426 A EP05776426 A EP 05776426A EP 1755893 A1 EP1755893 A1 EP 1755893A1
Authority
EP
European Patent Office
Prior art keywords
paint
cylinder
printing
stencil
substrate
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
EP05776426A
Other languages
German (de)
French (fr)
Other versions
EP1755893B1 (en
Inventor
André Beyrle
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.)
Saint Gobain Glass France SAS
Compagnie de Saint Gobain SA
Original Assignee
Saint Gobain Glass France SAS
Compagnie de Saint Gobain 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 Saint Gobain Glass France SAS, Compagnie de Saint Gobain SA filed Critical Saint Gobain Glass France SAS
Priority to PL05776426T priority Critical patent/PL1755893T3/en
Publication of EP1755893A1 publication Critical patent/EP1755893A1/en
Application granted granted Critical
Publication of EP1755893B1 publication Critical patent/EP1755893B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • B41F15/0809—Machines for printing sheets with cylindrical or belt-like screens

Definitions

  • the invention relates to a method for printing decorations, in particular on substrates of variable dimensions, in particular made of glass.
  • the printing process is of the kind in which the application of paint is provided with a rotary hollow cylinder-shaped stencil which presses and rolls against the substrate to be printed, the axial length of the stencil being greater than the maximum width of the substrates to print, the stencil being fed with paint or ink over its entire length, recovery means being provided downstream of the printing area to collect the paint which has not been transferred to the substrate.
  • a squeegee may be placed inside the hollow cylinder to squeeze the paint into the lower area of the cylinder.
  • Such a process is known from EP-A-0 874 458.
  • the stencil comprises zones which are outside the contour of the substrate, in particular because of the variable dimensions of this substrate.
  • the paint in these areas is not transferred to the substrate and is a surplus that can result in blurred images on the substrates that will follow.
  • means for recovering the excess paint are provided in the form of a doctor blade located inside the stencil to transfer the excess paint on a disposal cylinder rolling outside against the stencil.
  • the assembly is relatively bulky and the friction of the doctor blade against the stencil accelerates the wear of the equipment.
  • EP-A-0 511 883 shows a screen printing process for printing a decorative layer on glazing according to which a flat screen screen having some degree of flexibility, is attached to a peripheral frame.
  • the screen printing screen with the printing ink is applied against the glazing by a squeegee located on the side of the screen opposite the glazing.
  • a squeegee attached to the squeegee and located on the side of the screen opposite the glazing to be printed, is provided to suck the excess ink.
  • the nozzle is attached to the doctor blade and is moved along the screen. The nozzle is thus caused to pass over areas of the substrate that have been printed, which can affect the quality of printing.
  • the choice of the location of the nozzle is limited since the latter is fixed to the doctor blade.
  • the object of the invention is, above all, to provide a method for printing decorations on substrates which makes it possible to eliminate the excess paint on the rotary stencil under improved conditions, with reduced friction and under a space requirement.
  • the process for printing decorations on substrates is characterized in that the recovery means comprise pneumatic extraction means arranged in the vicinity of the hollow cylinder and means for collecting the paint extracted.
  • the pneumatic extraction means work by suction and are located either inside or outside the cylinder, as well as the means for collecting the extracted paint.
  • blowing means which contribute to the separation of the paint residues and which are located on the opposite face of the cylinder, respectively outside and inside thereof.
  • the suction means and the means for collecting the paint are located outside the cylinder.
  • the position of the recovery means is independent of that of a squeegee placed inside the hollow cylinder for pressing the paint in the lower area of the cylinder.
  • the recovery means are disposed in an angular zone which corresponds to three quarters of a circumference immediately downstream of the printing zone having for its starting point the doctor blade.
  • the position of the recovery means in said zone depends on the viscosity of the paint used: a low viscosity allows a position remote from the doctor blade.
  • the viscosity is high, it is advantageous to arrange the recovery means as close as possible to the doctor blade, preferably in the first quarter of the printing zone.
  • the means for recovering the extracted paint are located at a level lower than that of the extraction zone of the paint so that the gravity favors the recovery of the paint.
  • the pneumatic extraction means are disposed in an area below the horizontal plane passing through the axis of the cylinder, downstream of the printing zone.
  • the invention also relates to a device for printing decorations, in particular on substrates of variable dimensions, in particular made of glass, comprising a rotary hollow cylinder-shaped stencil which presses and rolls against the substrate to be printed, the axial length of the stencil being greater than the maximum width of the substrate to be printed, the stencil being supplied with paint over its entire length, recovery means being provided downstream of the printing zone to collect the paint which has not been transferred onto the substrate , characterized in that the recovery means comprise pneumatic extraction means for extracting the paint remaining in areas of the stencil and means for collecting the extracted paint.
  • Fig.l is a schematic vertical sectional view of a printing device according to the invention
  • Fig.2 is a schematic plan view of the device of Fig.l. Referring to the drawing, there can be seen a device 1 for printing decorations on substrates 2, 2a of varying shapes and sizes.
  • the substrates generally have a flat surface but may also have a curved surface having a small angle of curvature, less than about ten degrees, preferably less than a few degrees. By angle of curvature of the curved surface, it is necessary to understand the maximum angle that can be formed between two tangent planes at two different points of the surface.
  • the substrates are preferably made of a material resistant to the treatment of transformation of the paint, which may be exposure under ultraviolet radiation (UV-crosslinkable paint) or firing, for example at a temperature of the order of 100 to 250 ° C. VS
  • the substrates are in particular glass, but may be metal, ceramic or plastic, for example polycarbonate or polyacrylate.
  • the device 1 comprises a rotary screen 3 in the form of a hollow cylinder 4, or drum, of geometric axis XX, provided with a rigid screen screen.
  • the substrates 2, 2a are placed on a conveyor 5 which runs under the hollow cylinder 4 in the direction of the arrow A, that is to say from left to right according to FIG.
  • the hollow cylinder 4 is mounted on a horizontal shaft 6 (Supported by means not shown) and is rotated in the direction of the arrow G (anticlockwise direction according to Fig.l) so as to roll without sliding against the substrate 2.
  • the axial length L (Fig.2 ) of the stencil 3 is greater than the width (dimension parallel to the axis of the cylinder 4) m maximum of the substrate 2 to be printed, so that the impression of the decor can go to the longitudinal edges of the substrate 2.
  • the stencil 3 is fed, inside the hollow cylinder 4, P paint over its entire length by means not shown.
  • a doctor blade 7 is placed and held inside the hollow cylinder 4 to press the paint in the lower region of the hollow cylinder, substantially following the lower generatrix.
  • the decor to be printed may consist of one or more plain patterns, for example in the form of flat (s) and / or repetition.
  • the silkscreen screen which makes it possible to obtain the decoration is rigid and seamless, and may be composed of a perforated metal plate with the desired decoration, of a fabric formed of yarns made of an organic material, for example polyamide or a polyester, a metallized fabric, for example obtained by galvanizing the above-mentioned organic fabric, or a fabric of metal son.
  • the length L of the hollow cylinder can be several meters, up to about 4 meters, preferably up to 3 meters.
  • the circumference of the hollow cylinder may be greater than 1 meter, advantageously of the order of 1.5 meters.
  • the print speed can be 7 to 8 meters per minute.
  • the recovery means R are provided downstream of the printing zone I in the direction of rotation G of the hollow cylinder 4, to extract the paint remaining in the areas of the stencil 3 which are outside the substrate 2. In indeed, this paint has not been transferred to the substrate.
  • the recovery means R extend all along the hollow cylinder 4.
  • the recovery means R comprise pneumatic extraction means 8 in particular formed by a suction nozzle whose inlet 9 is situated in the vicinity of the hollow cylinder 4, this nozzle 8 being inclined downwards from the inlet 9.
  • nozzle 8 is located below the horizontal plane H passing through the axis XX of the hollow cylinder, and is connected to a suction pipe T, itself connected to a vacuum source not shown.
  • the recovery means further comprise means 10 for collecting the extracted paint.
  • the means 10 are advantageously formed by a receptacle located in the extension of the nozzle 8, at a lower level.
  • gravity acts essentially in the same direction as suction, which promotes the recovery of paint.
  • a dispenser 11 of diluent liquid it is possible to install, at the inlet 9 of the nozzle, a dispenser 11 of diluent liquid to prevent too fast drying of the extracted paint.
  • the means R may comprise a pressurized air blowing nozzle located inside the hollow cylinder 4 while the receptacle 10 is located outside the hollow cylinder in the extension of the substantially radial air jet. , directed downwards, coming from the nozzle.
  • the recovery means R are preferably arranged in an angular zone which corresponds to the quarter of circumference situated immediately downstream of the printing zone I.
  • the substrate 2 passing under the hollow cylinder 4 is printed, for example over its entire surface E.
  • the paint located in the zones 4a, 4b of the hollow cylinder outside the outline of the substrate 2 is recovered by the suction nozzle 8, which avoids fuzzy impressions later due to excess paint.
  • the excess paint does not remain exposed for a long time so that drying problems are limited, the risk of fouling of the screen is reduced.
  • the device for recovering excess paint is compact.
  • the power of recovery can easily be varied by acting on the suction power.
  • the pneumatic recovery, particularly by suction can be done without direct contact by keeping the nozzle 8 at a small distance from the hollow cylinder 4 so as to minimize the wear of the screen printing screen. The lower the distance, the better the efficiency of the suction. Recovery is located away from the print area and does not act on this area.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Screen Printers (AREA)

Abstract

The invention relates to a method for printing decorative elements, especially on substrates with variable dimensions, especially glass, according to which paint is applied with a rotating screened stencil (3) in the form of a hollow cylinder (4) which presses and rolls against the substrate (2) to be printed. According to the invention, the axial length of the stencil is higher than the maximum width of the substrates to be printed, the entire length of the stencil is supplied with paint, and recovery means (R) are provided upstream of the printing region (I) in order to collect the paint which has not been transferred onto the substrate. The recovery means comprise pneumatic extraction means (8) arranged in the vicinity of the hollow cylinder (4), and means (10) for collecting the extracted paint.

Description

PROCEDE ET DISPOSITIF D'IMPRESSION DE DECORS SUR DES SUBSTRATS.METHOD AND DEVICE FOR PRINTING DECORS ON SUBSTRATES.
L'invention est relative à un procédé d'impression de décors en particulier sur des substrats de dimensions variables, notamment en verre. Le procédé d'impression est du genre selon lequel l'application de peinture est assurée avec un pochoir tramé rotatif en forme de cylindre creux qui appuie et roule contre le substrat à imprimer, la longueur axiale du pochoir étant supérieure à la largeur maximale des substrats à imprimer, le pochoir étant alimenté en peinture ou encre sur toute sa longueur, des moyens de récupération étant prévus en aval de la zone d'impression pour recueillir la peinture qui n'a pas été transférée sur le substrat . Une racle peut être placée à l'intérieur du cylindre creux pour presser la peinture dans la zone inférieure du cylindre. Un tel procédé est connu d'après EP-A-0 874 458.The invention relates to a method for printing decorations, in particular on substrates of variable dimensions, in particular made of glass. The printing process is of the kind in which the application of paint is provided with a rotary hollow cylinder-shaped stencil which presses and rolls against the substrate to be printed, the axial length of the stencil being greater than the maximum width of the substrates to print, the stencil being fed with paint or ink over its entire length, recovery means being provided downstream of the printing area to collect the paint which has not been transferred to the substrate. A squeegee may be placed inside the hollow cylinder to squeeze the paint into the lower area of the cylinder. Such a process is known from EP-A-0 874 458.
Pour permettre d'imprimer les décors jusqu'aux bords du substrat, le pochoir comporte des zones qui se trouvent à l'extérieur du contour du substrat, notamment en raison des dimensions variables de ce substrat. La peinture se trouvant dans ces zones n'est pas transférée au substrat et constitue un excédent qui peut entraîner des images floues sur les substrats qui vont suivre. Pour éviter cet inconvénient, des moyens de récupération de la peinture excédentaire sont prévus sous forme d'une racle située à l'intérieur du pochoir pour transférer la peinture en excédent sur un cylindre d'élimination roulant à l'extérieur contre le pochoir. L'ensemble est relativement encombrant et le frottement de la racle contre le pochoir accélère l'usure du matériel. EP-A-0 511 883 montre un procédé de sérigraphie pour imprimer une couche décorative sur des vitrages selon lequel un écran sérigraphique plan, présentant une certaine flexibilité, est fixé à un cadre périphérique. L'écran sérigraphique avec l'encre d'impression est appliqué contre le vitrage par une racle située du côté de l'écran opposé au vitrage. Un suceur fixé à la racle et situé du côté de l'écran opposé au vitrage à imprimer, est prévu pour aspirer l'encre excédentaire. Le suceur est solidaire de la racle et est déplacé le long de l'écran sérigraphique. Le suceur est ainsi amené à passer au-dessus de zones du substrat qui ont été imprimées, ce qui peut nuire à la qualité de l'impression. En outre, le choix de l'emplacement du suceur est limité puisque ce dernier est fixé à la racle. L'invention a pour but, surtout, d'offrir un procédé d'impression de décors sur des substrats qui permet d'éliminer l'excès de peinture sur le pochoir rotatif dans des conditions améliorées, avec un frottement réduit et sous un encombrement également réduit. Selon l'invention, le procédé d'impression de décors sur des substrats, du genre défini précédemment, est caractérisé en ce que les moyens de récupération comprennent des moyens pneumatiques d'extraction disposés au voisinage du cylindre creux et des moyens pour recueillir la peinture extraite. Selon l'invention, les moyens pneumatiques d'extraction travaillent par aspiration et sont situés soit à l'intérieur soit à l'extérieur du cylindre, de même que les moyens pour recueillir la peinture extraite. A ces moyens sont avantageusement associés des moyens de soufflage qui contribuent au décollement des résidus de peinture et qui sont situés sur la face opposée du cylindre, respectivement à l'extérieur et à l'intérieur de celui-ci. De préférence, les moyens d'aspiration et les moyens pour recueillir la peinture sont situés à l'extérieur du cylindre. La position des moyens de récupération est indépendante de celle d'une racle placée à l'intérieur du cylindre creux pour presser la peinture dans la zone inférieure du cylindre. Les moyens de récupération sont disposés dans une zone angulaire qui correspond aux trois quarts de circonférence situés immédiatement en aval de la zone d'impression ayant pour point de départ la racle. La position des moyens de récupération dans ladite zone dépend de la viscosité de la peinture utilisée : une faible viscosité autorise une position éloignée de la racle. En revanche, si la viscosité est élevée, il est avantageux de disposer les moyens de récupération le plus proche possible de la racle, de préférence dans le premier quart de la zone d' impression. Avantageusement les moyens pour récupérer la peinture extraite sont situés à un niveau inférieur à celui de la zone d'extraction de la peinture de sorte que la gravité favorise la récupération de la peinture. En particulier, les moyens pneumatiques d'extraction sont disposés dans une zone située au-dessous du plan horizontal passant par l'axe du cylindre, en aval de la zone d' impression. L'invention concerne également un dispositif d'impression de décors en particulier sur des substrats de dimensions variables, notamment en verre, comportant un pochoir tramé rotatif en forme de cylindre creux qui appuie et roule contre le substrat à imprimer, la longueur axiale du pochoir étant supérieure à la largeur maximale du substrat à imprimer, le pochoir étant alimenté en peinture sur toute sa longueur, des moyens de récupération étant prévus en aval de la zone d'impression pour recueillir la peinture qui n'a pas été transférée sur le substrat, caractérisé en ce que les moyens de récupération comprennent des moyens pneumatiques d'extraction pour extraire la peinture subsistant dans des zones du pochoir et des moyens pour recueillir la peinture extraite. De préférence les moyens pneumatiques d'extraction travaillent par aspiration et sont situés à l'extérieur du cylindre, en particulier au-dessous du plan horizontal passant par l'axe géométrique du cylindre. L'invention consiste, mises à part les dispositions exposées ci-dessus, en un certain nombre d'autres dispositions dont il sera plus explicitement question ci- après à propos d'un exemple de réalisation particulier décrit avec référence au dessin annexé, mais qui n'est nullement limitatif. Sur ce dessin : Fig.l est une vue schématique en coupe verticale d'un dispositif d'impression selon l'invention, et Fig.2 est une vue en plan schématique du dispositif de Fig.l. En se reportant au dessin, on peut voir un dispositif 1 pour l'impression de décors sur des substrats 2, 2a de formes et de tailles variables. Les substrats ont généralement une surface plane mais peuvent aussi présenter une surface incurvée ayant un angle de courbure faible, inférieur à une dizaine de degrés, de préférence inférieur à quelques degrés . Par angle de courbure de la surface incurvée, il faut comprendre l'angle maximum qui peut être formé entre deux plans tangents en deux points différents de la surface. Les substrats sont de préférence en une matière résistant au traitement de transformation de la peinture, qui peut être une exposition sous des radiations ultraviolettes (peinture UV-réticulable) ou une cuisson, par exemple à une température de l'ordre de 100 à 250°CTo allow the decorations to be printed to the edges of the substrate, the stencil comprises zones which are outside the contour of the substrate, in particular because of the variable dimensions of this substrate. The paint in these areas is not transferred to the substrate and is a surplus that can result in blurred images on the substrates that will follow. To avoid this drawback, means for recovering the excess paint are provided in the form of a doctor blade located inside the stencil to transfer the excess paint on a disposal cylinder rolling outside against the stencil. The assembly is relatively bulky and the friction of the doctor blade against the stencil accelerates the wear of the equipment. EP-A-0 511 883 shows a screen printing process for printing a decorative layer on glazing according to which a flat screen screen having some degree of flexibility, is attached to a peripheral frame. The screen printing screen with the printing ink is applied against the glazing by a squeegee located on the side of the screen opposite the glazing. A squeegee attached to the squeegee and located on the side of the screen opposite the glazing to be printed, is provided to suck the excess ink. The nozzle is attached to the doctor blade and is moved along the screen. The nozzle is thus caused to pass over areas of the substrate that have been printed, which can affect the quality of printing. In addition, the choice of the location of the nozzle is limited since the latter is fixed to the doctor blade. The object of the invention is, above all, to provide a method for printing decorations on substrates which makes it possible to eliminate the excess paint on the rotary stencil under improved conditions, with reduced friction and under a space requirement. reduced. According to the invention, the process for printing decorations on substrates, of the kind defined above, is characterized in that the recovery means comprise pneumatic extraction means arranged in the vicinity of the hollow cylinder and means for collecting the paint extracted. According to the invention, the pneumatic extraction means work by suction and are located either inside or outside the cylinder, as well as the means for collecting the extracted paint. To these means are advantageously associated blowing means which contribute to the separation of the paint residues and which are located on the opposite face of the cylinder, respectively outside and inside thereof. Preferably, the suction means and the means for collecting the paint are located outside the cylinder. The position of the recovery means is independent of that of a squeegee placed inside the hollow cylinder for pressing the paint in the lower area of the cylinder. The recovery means are disposed in an angular zone which corresponds to three quarters of a circumference immediately downstream of the printing zone having for its starting point the doctor blade. The position of the recovery means in said zone depends on the viscosity of the paint used: a low viscosity allows a position remote from the doctor blade. On the other hand, if the viscosity is high, it is advantageous to arrange the recovery means as close as possible to the doctor blade, preferably in the first quarter of the printing zone. Advantageously, the means for recovering the extracted paint are located at a level lower than that of the extraction zone of the paint so that the gravity favors the recovery of the paint. In particular, the pneumatic extraction means are disposed in an area below the horizontal plane passing through the axis of the cylinder, downstream of the printing zone. The invention also relates to a device for printing decorations, in particular on substrates of variable dimensions, in particular made of glass, comprising a rotary hollow cylinder-shaped stencil which presses and rolls against the substrate to be printed, the axial length of the stencil being greater than the maximum width of the substrate to be printed, the stencil being supplied with paint over its entire length, recovery means being provided downstream of the printing zone to collect the paint which has not been transferred onto the substrate , characterized in that the recovery means comprise pneumatic extraction means for extracting the paint remaining in areas of the stencil and means for collecting the extracted paint. Preferably the pneumatic extraction means work by suction and are located outside the cylinder, in particular below the horizontal plane passing through the geometric axis of the cylinder. The invention consists, apart from the arrangements set out above, in a certain number of other arrangements which will be more explicitly discussed hereinafter with reference to a particular embodiment described with reference to the appended drawing, but which is in no way limiting. In this drawing: Fig.l is a schematic vertical sectional view of a printing device according to the invention, and Fig.2 is a schematic plan view of the device of Fig.l. Referring to the drawing, there can be seen a device 1 for printing decorations on substrates 2, 2a of varying shapes and sizes. The substrates generally have a flat surface but may also have a curved surface having a small angle of curvature, less than about ten degrees, preferably less than a few degrees. By angle of curvature of the curved surface, it is necessary to understand the maximum angle that can be formed between two tangent planes at two different points of the surface. The substrates are preferably made of a material resistant to the treatment of transformation of the paint, which may be exposure under ultraviolet radiation (UV-crosslinkable paint) or firing, for example at a temperature of the order of 100 to 250 ° C. VS
(peinture organique), ou jusqu'à environ 600°C (émail). Les substrats sont notamment en verre, mais peuvent être en métal, en céramique ou en matière plastique, par exemple en polycarbonate ou en polyacrylate . Le dispositif 1 comprend un pochoir 3 tramé rotatif en forme de cylindre creux 4, ou tambour, d'axe géométrique X-X, muni d'un écran de sérigraphie rigide. Les substrats 2, 2a sont placés sur un convoyeur 5 qui défile sous le cylindre creux 4 suivant le sens de la flèche A, c'est-à-dire de gauche à droite selon Fig.l. Le cylindre creux 4 est monté sur un arbre horizontal 6 (supporté par des moyens non représentés) et est entraîné en rotation dans le sens de la flèche G (sens contraire d'horloge selon Fig.l) de manière à rouler sans glisser contre le substrat 2. La longueur axiale L (Fig.2) du pochoir 3 est supérieure à la largeur (dimension parallèle à l'axe du cylindre 4) maximale m du substrat 2 à imprimer, de sorte que l'impression du décor peut aller jusqu'aux bords longitudinaux du substrat 2. Le pochoir 3 est alimenté, à l'intérieur du cylindre creux 4, en peinture P sur toute sa longueur par des moyens non représentés . Une racle 7 est placée et maintenue à l'intérieur du cylindre creux 4 pour presser la peinture dans la zone inférieure du cylindre creux, pratiquement suivant la génératrice inférieure. Le décor à imprimer peut être constitué d'un ou plusieurs motifs unis, par exemple sous forme d' à-plat (s) et/ou à répétition. L'écran de sérigraphie qui permet d'obtenir le décor est rigide et sans couture, et peut être composé d'une plaque métallique perforée au décor voulu, d'un tissu formé de fils en une matière organique, par exemple du polyamide ou un polyester, d'un tissu métallisé, par exemple obtenu par galvanisation du tissu de fils organiques précité, ou d'un tissu de fils métalliques. La longueur L du cylindre creux peut être de plusieurs mètres, jusqu'à environ 4 mètres, de préférence jusqu'à 3 mètres. La circonférence du cylindre creux peut être supérieure à 1 mètre, avantageusement de l'ordre de 1,5 mètre. La vitesse d'impression peut être de 7 à 8 mètres par minute. Des moyens de récupération R sont prévus en aval de la zone d'impression I suivant le sens de rotation G du cylindre creux 4, pour extraire la peinture subsistant dans les zones du pochoir 3 qui se trouvent à l'extérieur du substrat 2. En effet, cette peinture n'a pas été transférée sur le substrat. Les moyens de récupération R s'étendent tout le long du cylindre creux 4. Les moyens de récupération R comprennent des moyens pneumatiques d'extraction 8 notamment formés par une buse d'aspiration dont l'entrée 9 est située au voisinage du cylindre creux 4, cette buse 8 étant inclinée vers le bas depuis l'entrée 9. La buse 8 est située au-dessous du plan horizontal H passant par l'axe X-X du cylindre creux, et est reliée à une tubulure T d'aspiration , elle-même raccordée à une source de dépression non représentée. Les moyens de récupération comprennent en outre des moyens 10 pour recueillir la peinture extraite. Ces moyens 10 sont avantageusement formés par un réceptacle situé dans le prolongement de la buse 8, à un niveau inférieur. Ainsi la gravité agit essentiellement dans le même sens que l'aspiration, ce qui favorise la récupération de la peinture . On peut installer, au niveau de l'entrée 9 de la buse, un distributeur 11 de liquide diluant pour éviter un séchage trop rapide de la peinture extraite. En variante, les moyens R peuvent comprendre une buse de soufflage d'air sous pression située à l'intérieur du cylindre creux 4 tandis que le réceptacle 10 serait situé à l'extérieur du cylindre creux dans le prolongement du jet d'air sensiblement radial, dirigé vers le bas, provenant de la buse. Les moyens de récupération R sont disposés de préférence dans une zone angulaire qui correspond au quart de circonférence situé immédiatement en aval de la zone d'impression I. Le fonctionnement résulte immédiatement des explications qui précèdent. Comme visible sur Fig.2, le substrat 2 en passant sous le cylindre creux 4 est imprimé, par exemple sur l'ensemble de sa surface E. La peinture située dans les zones 4a, 4b du cylindre creux à l'extérieur du contour du substrat 2 est récupérée par la buse d'aspiration 8, ce qui évite des impressions floues ultérieures dues à un excédent de peinture. La peinture en excès ne reste pas longtemps exposée à l'air de sorte que les problèmes de séchage sont limités, le risque d'encrassement de l'écran sérigraphique est réduit . Le dispositif de récupération de la peinture en excès est peu encombrant. On peut faire varier aisément la puissance de récupération en agissant sur la puissance d'aspiration. La récupération pneumatique, notamment par aspiration, peut se faire sans contact direct en maintenant la buse 8 à faible distance du cylindre creux 4 de manière à réduire au minimum l'usure du tamis de sérigraphie. Plus la distance est faible, meilleure est l'efficacité de 1' aspiration. La récupération est située à distance de la zone d'impression et n'agit pas sur cette zone. (organic paint), or up to about 600 ° C (enamel). The substrates are in particular glass, but may be metal, ceramic or plastic, for example polycarbonate or polyacrylate. The device 1 comprises a rotary screen 3 in the form of a hollow cylinder 4, or drum, of geometric axis XX, provided with a rigid screen screen. The substrates 2, 2a are placed on a conveyor 5 which runs under the hollow cylinder 4 in the direction of the arrow A, that is to say from left to right according to FIG. The hollow cylinder 4 is mounted on a horizontal shaft 6 (Supported by means not shown) and is rotated in the direction of the arrow G (anticlockwise direction according to Fig.l) so as to roll without sliding against the substrate 2. The axial length L (Fig.2 ) of the stencil 3 is greater than the width (dimension parallel to the axis of the cylinder 4) m maximum of the substrate 2 to be printed, so that the impression of the decor can go to the longitudinal edges of the substrate 2. The stencil 3 is fed, inside the hollow cylinder 4, P paint over its entire length by means not shown. A doctor blade 7 is placed and held inside the hollow cylinder 4 to press the paint in the lower region of the hollow cylinder, substantially following the lower generatrix. The decor to be printed may consist of one or more plain patterns, for example in the form of flat (s) and / or repetition. The silkscreen screen which makes it possible to obtain the decoration is rigid and seamless, and may be composed of a perforated metal plate with the desired decoration, of a fabric formed of yarns made of an organic material, for example polyamide or a polyester, a metallized fabric, for example obtained by galvanizing the above-mentioned organic fabric, or a fabric of metal son. The length L of the hollow cylinder can be several meters, up to about 4 meters, preferably up to 3 meters. The circumference of the hollow cylinder may be greater than 1 meter, advantageously of the order of 1.5 meters. The print speed can be 7 to 8 meters per minute. R recovery means are provided downstream of the printing zone I in the direction of rotation G of the hollow cylinder 4, to extract the paint remaining in the areas of the stencil 3 which are outside the substrate 2. In indeed, this paint has not been transferred to the substrate. The recovery means R extend all along the hollow cylinder 4. The recovery means R comprise pneumatic extraction means 8 in particular formed by a suction nozzle whose inlet 9 is situated in the vicinity of the hollow cylinder 4, this nozzle 8 being inclined downwards from the inlet 9. nozzle 8 is located below the horizontal plane H passing through the axis XX of the hollow cylinder, and is connected to a suction pipe T, itself connected to a vacuum source not shown. The recovery means further comprise means 10 for collecting the extracted paint. These means 10 are advantageously formed by a receptacle located in the extension of the nozzle 8, at a lower level. Thus gravity acts essentially in the same direction as suction, which promotes the recovery of paint. It is possible to install, at the inlet 9 of the nozzle, a dispenser 11 of diluent liquid to prevent too fast drying of the extracted paint. As a variant, the means R may comprise a pressurized air blowing nozzle located inside the hollow cylinder 4 while the receptacle 10 is located outside the hollow cylinder in the extension of the substantially radial air jet. , directed downwards, coming from the nozzle. The recovery means R are preferably arranged in an angular zone which corresponds to the quarter of circumference situated immediately downstream of the printing zone I. The operation results immediately from the foregoing explanations. As visible in FIG. 2, the substrate 2 passing under the hollow cylinder 4 is printed, for example over its entire surface E. The paint located in the zones 4a, 4b of the hollow cylinder outside the outline of the substrate 2 is recovered by the suction nozzle 8, which avoids fuzzy impressions later due to excess paint. The excess paint does not remain exposed for a long time so that drying problems are limited, the risk of fouling of the screen is reduced. The device for recovering excess paint is compact. The power of recovery can easily be varied by acting on the suction power. The pneumatic recovery, particularly by suction, can be done without direct contact by keeping the nozzle 8 at a small distance from the hollow cylinder 4 so as to minimize the wear of the screen printing screen. The lower the distance, the better the efficiency of the suction. Recovery is located away from the print area and does not act on this area.

Claims

REVENDICATIONS
1. Procédé d'impression de décors en particulier sur des substrats (2,2a) de dimensions variables, notamment en verre, selon lequel une application de peinture est assurée avec un pochoir tramé rotatif (3) en forme de cylindre creux (4) qui appuie et roule contre le substrat à imprimer, la longueur axiale (L) du pochoir étant supérieure à la largeur maximale (m) des substrats à imprimer, le pochoir étant alimenté en peinture sur toute sa longueur, des moyens de récupération étant prévus en aval de la zone d'impression pour recueillir la peinture qui n'a pas été transférée sur le substrat, les moyens de récupération comprenant des moyens pneumatiques d'extraction disposés au voisinage du cylindre creux et des moyens pour recueillir la peinture extraite, caractérisé en ce que les moyens pneumatiques d'extraction (8) sont situés à l'extérieur du cylindre (4) et travaillent par aspiration, et les moyens (10) pour recueillir la peinture extraite sont également situés à l'extérieur du cylindre (4) .A method for printing decorations, in particular on substrates (2, 2a) of variable dimensions, in particular glass, in which a paint application is provided with a rotary-shaped rotary screen (3) in the form of a hollow cylinder (4) which presses and rolls against the substrate to be printed, the axial length (L) of the stencil being greater than the maximum width (m) of the substrates to be printed, the stencil being supplied with paint over its entire length, recovery means being provided in downstream of the printing zone to collect the paint which has not been transferred onto the substrate, the recovery means comprising pneumatic extraction means arranged in the vicinity of the hollow cylinder and means for collecting the extracted paint, characterized in the pneumatic extracting means (8) are located outside the cylinder (4) and work by suction, and the means (10) for collecting the extracted paint are also s ituated outside the cylinder (4).
2. Procédé selon la revendication 1, selon lequel une racle (7) est placée à l'intérieur du cylindre creux (4) pour presser la peinture dans la zone inférieure du cylindre, caractérisé en ce que la position des moyens de récupération (8, 10) est indépendante de celle de la racle (7) .2. Method according to claim 1, wherein a squeegee (7) is placed inside the hollow cylinder (4) to press the paint in the lower zone of the cylinder, characterized in that the position of the recovery means (8) , 10) is independent of that of the doctor blade (7).
3. Procédé selon la revendication 1 ou 2 , caractérisé en ce que les moyens (10) pour récupérer la peinture extraite sont situés à un niveau inférieur à celui de la zone d'extraction de la peinture de sorte que la gravité favorise la récupération de la peinture. 3. Method according to claim 1 or 2, characterized in that the means (10) for recovering the extracted paint are located at a level lower than that of the paint extraction zone so that the gravity favors the recovery of the paint. the painting.
4. Procédé selon la revendications 3, caractérisé en ce que les moyens pneumatiques d'extraction (8) sont disposés dans une zone située au-dessous du plan horizontal (H) passant par l'axe du cylindre (4), en aval de la zone d'impression (D .4. Method according to claim 3, characterized in that the pneumatic extraction means (8) are arranged in an area below the horizontal plane (H) passing through the axis of the cylinder (4), downstream of the printing area (D.
5. Procédé selon l'une des revendications précédentes, caractérisé en ce que les substrats sont en l'une des matières suivantes : verre, métal, céramique, plastique.5. Method according to one of the preceding claims, characterized in that the substrates are in one of the following materials: glass, metal, ceramic, plastic.
6. Dispositif d'impression de décors en particulier sur des substrats (2,2a) de dimensions variables, notamment en verre, comportant un pochoir tramé rotatif (3) en forme de cylindre creux (4) qui appuie et roule contre le substrat (2) à imprimer, la longueur axiale (L) du pochoir étant supérieure à la largeur maximale (m) du substrat à imprimer, le pochoir étant alimenté en peinture sur toute sa longueur, des moyens de récupération (R) étant prévus en aval de la zone d'impression pour recueillir la peinture qui n'a pas été transférée sur le substrat, les moyens de récupération (R) comprenant des moyens pneumatiques d'extraction (8) pour extraire la peinture subsistant dans des zones du pochoir et des moyens (10) pour recueillir la peinture extraite, caractérisé en ce que les moyens pneumatiques d'extraction (8) travaillent par aspiration et sont situés à l'extérieur du cylindre (4), de même que les moyens (10) pour recueillir la peinture extraite.6. Apparatus for printing decorations, in particular on substrates (2,2a) of variable dimensions, in particular made of glass, comprising a rotary-shaped rotary screen (3) in the form of a hollow cylinder (4) which presses and rolls against the substrate ( 2) to be printed, the axial length (L) of the stencil being greater than the maximum width (m) of the substrate to be printed, the stencil being supplied with paint over its entire length, recovery means (R) being provided downstream of the printing zone for collecting the paint which has not been transferred to the substrate, the recovery means (R) comprising pneumatic extraction means (8) for extracting the paint remaining in areas of the stencil and means (10) for collecting the extracted paint, characterized in that the pneumatic extraction means (8) work by suction and are located outside the cylinder (4), as well as the means (10) for collecting the paint extracted.
7. Dispositif selon la revendication 6, comportant une racle (7) placée à l'intérieur du cylindre creux (4) pour presser la peinture dans la zone inférieure du cylindre, caractérisé en ce que la position des moyens de récupération (8, 10) est indépendante de celle de la racle (7) .7. Device according to claim 6, comprising a doctor blade (7) placed inside the hollow cylinder (4) for pressing the paint in the lower zone of the cylinder, characterized in that the position of the recovery means (8, 10) ) is independent of that of the doctor blade (7).
8. Dispositif selon la revendication 6 ou 7, caractérisé en ce que les moyens (10) pour récupérer la peinture extraite sont situés à un niveau inférieur à celui de la zone d'extraction de la peinture de sorte que la gravité favorise la récupération de la peinture.8. Device according to claim 6 or 7, characterized in that the means (10) for recovering the extracted paint are located at a lower level than the paint extraction zone so that gravity favors the recovery of the paint.
9. Dispositif selon la revendication 8, caractérisé en ce que les moyens pneumatiques d'extraction (8) sont disposés dans une zone située au-dessous du plan horizontal (H) passant par l'axe du cylindre (4), en aval de la zone d'impression (I) .9. Device according to claim 8, characterized in that the pneumatic extraction means (8) are arranged in an area below the horizontal plane (H) passing through the axis of the cylinder (4), downstream of the printing area (I).
10. Dispositif selon l'une des revendications 6 à 9, caractérisé en ce qu'il comporte un écran de sérigraphie rigide et sans couture composé d'une plaque métallique perforée au décor voulu, ou d'un tissu formé de fils en une matière organique, ou d'un tissu métallisé, ou d'un tissu de fils métalliques 10. Device according to one of claims 6 to 9, characterized in that it comprises a rigid and seamless screen printing screen composed of a perforated metal plate of the desired decoration, or a fabric formed of son in a material organic, or metallized fabric, or wire fabric
EP05776426A 2004-06-04 2005-06-02 Method and device for printing decorative elements on substrates Not-in-force EP1755893B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05776426T PL1755893T3 (en) 2004-06-04 2005-06-02 Method and device for printing decorative elements on substrates

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0406139A FR2871099B1 (en) 2004-06-04 2004-06-04 METHOD AND DEVICE FOR PRINTING DECORS ON SUBSTRATES
PCT/FR2005/050406 WO2005123389A1 (en) 2004-06-04 2005-06-02 Method and device for printing decorative elements on substrates

Publications (2)

Publication Number Publication Date
EP1755893A1 true EP1755893A1 (en) 2007-02-28
EP1755893B1 EP1755893B1 (en) 2007-11-14

Family

ID=34945970

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05776426A Not-in-force EP1755893B1 (en) 2004-06-04 2005-06-02 Method and device for printing decorative elements on substrates

Country Status (8)

Country Link
EP (1) EP1755893B1 (en)
AT (1) ATE378176T1 (en)
DE (1) DE602005003357T2 (en)
ES (1) ES2297752T3 (en)
FR (1) FR2871099B1 (en)
PL (1) PL1755893T3 (en)
PT (1) PT1755893E (en)
WO (1) WO2005123389A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014012700A1 (en) * 2012-07-16 2014-01-23 Saint-Gobain Glass France Screen printing device for applying an ink
US10414186B2 (en) 2015-12-18 2019-09-17 3M Innovative Properties Company Process for depositing dry powder particles onto a substrate and attaching the particles to the substrate
US10773275B2 (en) 2015-12-18 2020-09-15 3M Innovative Properties Company Process for depositing dry powder particles onto a substrate and adhesively bonding the particles to the substrate

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Publication number Priority date Publication date Assignee Title
US1668322A (en) * 1927-04-12 1928-05-01 Jr Harry C Kessler Machine for printing designs on floor covering
NL6912433A (en) * 1969-08-15 1971-02-17
DE4109707C1 (en) 1991-03-23 1992-10-22 Vegla Vereinigte Glaswerke Gmbh, 5100 Aachen, De
EP0738215A1 (en) * 1993-12-24 1996-10-23 Carlo Antonio Camorani Silk-screen process for decorating items and associated apparatus
DE19716452A1 (en) 1997-04-21 1998-10-22 Bosch Gmbh Robert Reduced data coding of time-varying signals with filter banks
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

Non-Patent Citations (1)

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Title
See references of WO2005123389A1 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014012700A1 (en) * 2012-07-16 2014-01-23 Saint-Gobain Glass France Screen printing device for applying an ink
US9757937B2 (en) 2012-07-16 2017-09-12 Saint-Gobain Glass France Screen printing device for applying an ink
US10414186B2 (en) 2015-12-18 2019-09-17 3M Innovative Properties Company Process for depositing dry powder particles onto a substrate and attaching the particles to the substrate
US10773275B2 (en) 2015-12-18 2020-09-15 3M Innovative Properties Company Process for depositing dry powder particles onto a substrate and adhesively bonding the particles to the substrate

Also Published As

Publication number Publication date
DE602005003357T2 (en) 2008-10-02
PT1755893E (en) 2008-02-25
ATE378176T1 (en) 2007-11-15
WO2005123389A1 (en) 2005-12-29
FR2871099B1 (en) 2007-10-26
PL1755893T3 (en) 2008-04-30
DE602005003357D1 (en) 2007-12-27
ES2297752T3 (en) 2008-05-01
FR2871099A1 (en) 2005-12-09
EP1755893B1 (en) 2007-11-14

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