EP0974458B1 - Screen printing method for decorative printing flat objects, especially glass panes, and apparatus for carrying out the method - Google Patents

Screen printing method for decorative printing flat objects, especially glass panes, and apparatus for carrying out the method Download PDF

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Publication number
EP0974458B1
EP0974458B1 EP99113909A EP99113909A EP0974458B1 EP 0974458 B1 EP0974458 B1 EP 0974458B1 EP 99113909 A EP99113909 A EP 99113909A EP 99113909 A EP99113909 A EP 99113909A EP 0974458 B1 EP0974458 B1 EP 0974458B1
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Prior art keywords
printing
color
screen printing
screen
stencil
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EP99113909A
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German (de)
French (fr)
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EP0974458A1 (en
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Rob Borgmann
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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
    • B41M1/26—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
    • B41F15/0809—Machines for printing sheets with cylindrical or belt-like screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/003—Cleaning arrangements or devices for screen printers or parts thereof
    • B41F35/004—Cleaning arrangements or devices for screen printers or parts thereof for cylindrical screens
    • 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

Definitions

  • the invention relates to a screen printing method for printing on flat objects, especially glass panes, with a Decor and a device for performing the method, wherein a decor is to be understood as an ornament that is over part of the surface of the object or over the entire surface whose area extends.
  • Screen printing machines for printing a wide variety of objects and materials are generally known.
  • the object to be printed is placed on a table, then the flat screen stencil attached to a frame and provided with a printing surface is lowered, the squeegee is pressed onto the screen stencil and pulled over it, so that the existing printing ink under the movement of the Squeegee is pressed through the open meshes of the printing surface of the screen and applied to the surface of the object.
  • This procedure can only be used for the recurring printing of objects with the same dimensions.
  • a second Glass pane printed with a larger decor width and / or length see above also remains at the points on the printing surface where the printing surface on the outline of the decor of the first printed glass pane protrudes and therefore not in the area of channel-like Deepening with connected pressure source (suction air flow) excess ink in the mesh of the screen template back.
  • the present invention relates to a method with the flat objects, especially glass panes, different Outer contours (in terms of dimensions and / or surface geometries) printed with one and the same screen template can be guaranteed, whereby always a clean print image shall be.
  • a simply constructed device proposed to carry out the procedure.
  • the advantages of the invention are that flat objects, especially glass panes with different outer contours (in terms of dimensions and / or surface geometries) continuously or discontinuously with one and the same screen template can be printed to apply the same decor, and always ensure a clean print image can, because there is excess ink before the next printing process regardless of where on the printing surface this available after completion of a previous printing process is, can be eliminated. Accordingly, the printing surface of the screen template completely free of printing ink for a subsequent printing process Available.
  • the device-technical embodiment ensures the invention according to claim 5 an extremely simple structure the device using functional elements that are identical in any case (second squeegee) and an effective color discharge from the Printing area of the screen stencil on the ink removal roller.
  • the device shown in FIG. 1 consists of a rotating, hollow cylindrical and provided with a pressure surface 1 Screen template 2, which is in operative connection with an ink removal roller 3 stands.
  • the printing area 1 is at least the largest Width 4 of the objects designed as glass panes 5 adapted to be transferred decor 6.
  • In the interior 7 of the screen template 2 are two doctor blades 8, 9 and a feed device, not shown for the printing ink (ceramic stoving ink) 10 located, the first doctor blade 8 on the one to be printed Glass pane 5 facing side and the second doctor 9 on the Ink removal roller 3 is arranged side and the ink removal roller 3 has a paint scraper 11.
  • an endless conveyor 12 in the form of a revolving conveyor belt arranged on which the glass panes 5 up to 5 '' '' and maintaining a defined distance 13 placed and the stencil 2 for printing with a same decor 6 can be fed continuously or discontinuously are.
  • the conveyor speed corresponds to the conveyor belt the rotational speed of the screen template 2 and the ink removal roller 3rd
  • the first squeegee 8 causes the transfer of the printing ink 10 located in the meshes of the printing surface 1 of the screen stencil 2 the glass pane 5 to form a decoration 6.
  • part of the printing surface 1 has also been provided with printing ink 10 ', which is already in the direction of the ink removal roller before the glass pane 5 comes into contact with the screen stencil 2 3 moved and thus its printing ink 10 'could not be printed on the glass sheet 5.
  • the printing surface 1 of the screen template 2 according to FIG. 2 thus stands for the subsequent printing process of the second glass pane, which has a greater width 4 than the first glass pane and, for example, the glass pane (for example rectangular glass pane 5 ') with the largest decorative width of all the glass panes 5 to 5 '''' again free of printing inks and thus available for securing a clean print image of decor 6.
  • the glass pane for example rectangular glass pane 5 '
  • the screen printing process works in such a way that a rotating, hollow cylindrical screen template 2 is used, the Print area 1 at least the largest width 4 of the on the objects 5 to 5 '' '' to be transferred decorations 6 and hereinafter the one not transferred to item 5 to 5 '' '' Printing ink 10 'mechanically out of the printing area after the printing process 1 of the screen template 2 is removed.
  • the glass sheets 5 to 5 ''''' on an endless conveyor 12 fed to the screen stencil 2 for printing, placing the glass panes 5 to 5 ''''' on the Endless conveyor device 12 continuously or discontinuously can be done.

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)

Abstract

A rotating hollow screen template (2) is used with a print surface whose width is at least as wide as the greatest width of the objects to be printed. Following the printing process the ink remaining on the rollers is mechanically removed. An arrangement for carrying out the printing process is also claimed.

Description

Die Erfindung betrifft ein Siebdruckverfahren zum Bedrucken von ebenflächigen Gegenständen, insbesondere Glasscheiben, mit einem Dekor und eine Vorrichtung zur Durchführung des Verfahrens, wobei unter einem Dekor eine Verzierung verstanden werden soll, die sich über einen Teil der Fläche des Gegenstandes oder ganzflächig über dessen Fläche erstreckt.The invention relates to a screen printing method for printing on flat objects, especially glass panes, with a Decor and a device for performing the method, wherein a decor is to be understood as an ornament that is over part of the surface of the object or over the entire surface whose area extends.

Siebdruckmaschinen zum Bedrucken von unterschiedlichsten Gegenständen und Materialien sind allgemein bekannt.
Beim Verfahren nach dem Flachbettsiebdruck wird der zu bedruckende Gegenstand auf einen Tisch aufgelegt, nachfolgend die an einem Rahmen befestigte und mit einer Druckfläche versehene flache Siebschablone abgesenkt, die Rakel auf die Siebschablone aufgedrückt und über dieses gezogen, so daß die vorhandene Druckfarbe unter der Bewegung der Rakel durch die offenen Maschen der Druckfläche des Siebes gedrückt und auf die Oberfläche des Gegenstands aufgetragen wird. Dieses Verfahren ist nur zum wiederkehrenden Bedrukken von Gegenständen anwendbar, die gleiche maßliche Verhältnisse aufweisen. Sollen mit der gleichen Siebschablone jedoch Gegenstände unterschiedlicher Abmessungen, einschließlich üblicher Maßtoleranzen der Gegenstände und Positionierungsabweichungen der Siebschablone und der zu bedruckenden Gegenstände, bis in deren Randbereiche bedruckt werden, so bleibt dann, wenn der für Druckfarbe durchlässige Teil (= Druckfläche) der Siebschablone über die äußeren Abmessungen des Gegenstandes hinausragt, an diesen Stellen Druckfarbe in den Maschen der Siebschablone vorrätig. Dies führt unumgänglich zu unsauberen Druckbildern beim nachfolgenden Druckvorgang durch einen dann vorliegenden Farbüberschuß. Dieses Problem wird für das Bedrucken einer Autoglasscheibe entlang ihrer Scheibenkante mit einer Dekorschicht gemäß der DE 41 09 707 C1 verfahrensmäßig gelöst, indem eine Siebschablone mit einer über die Glasscheibenkante hinausreichenden Druckfläche verwendet und die beim Druckvorgang außerhalb der Glasoberfläche in der Siebschablone befindliche Druckfarbe beim oder unmittelbar nach dem Druckvorgang durch pneumatischen Differenzdruck aus den Maschen der Siebschablone entfernt wird, so daß die Siebschablone für jeden der nachfolgenden Druckvorgänge wieder frei von Druckfarbe bereitgestellt werden kann. Demgemäß ist bei einer derartigen Flachbettsiebdruckmaschine die Tischplatte im Bereich der Umfangsfläche des Gegenstandes (Glasscheibe) mit einer kanalartigen Vertiefung ausgestattet, die über einen Verteilerkanal und Rohrleitungen an eine Überdruckquelle anschließbar ist, so daß die überschüssige Farbe abgesaugt werden kann.Screen printing machines for printing a wide variety of objects and materials are generally known.
In the process according to flatbed screen printing, the object to be printed is placed on a table, then the flat screen stencil attached to a frame and provided with a printing surface is lowered, the squeegee is pressed onto the screen stencil and pulled over it, so that the existing printing ink under the movement of the Squeegee is pressed through the open meshes of the printing surface of the screen and applied to the surface of the object. This procedure can only be used for the recurring printing of objects with the same dimensions. If, however, objects of different dimensions, including the usual dimensional tolerances of the objects and positioning deviations of the sieve template and the objects to be printed, are to be printed with the same screen stencil up to the edge areas thereof, then if the part permeable to printing ink (= printing surface) of the screen stencil remains over the protrudes from the outer dimensions of the object, at these points printing ink is available in the mesh of the screen template. This inevitably leads to unclean print images in the subsequent printing process due to an excess of color. This problem is solved procedurally for printing a car glass pane along its pane edge with a decorative layer according to DE 41 09 707 C1 by using a screen stencil with a printing surface extending beyond the glass pane edge and the printing ink located in the screen stencil during the printing process immediately or immediately is removed from the mesh of the screen stencil after the printing process by means of pneumatic differential pressure, so that the screen stencil can be made free of printing ink again for each of the subsequent printing processes. Accordingly, in such a flatbed screen printing machine, the table top in the area of the peripheral surface of the object (glass pane) is equipped with a channel-like depression which can be connected to a positive pressure source via a distribution channel and pipelines, so that the excess ink can be suctioned off.

Im Rahmen moderner Architektur findet seit geraumer Zeit der Werkstoff Glas verstärkt Verwendung. Dabei werden insbesondere Fassadenverkleidungen großflächig mit Sicherheitsglasscheiben verblendet. Diese Glasscheiben weisen zur Erhöhung der optischen Wirkung regelmäßig Dekore aus im Flachbettsiebdruckverfahren aufgebrachten keramischen Einbrennfarben auf, wobei sich diese Dekore über einen Teil der Glasscheibenfläche (z.B. Punktraster, Streifenraster, Karoraster, Längsstreifen, Querstreifen o.ä.) oder ganzflächig über diese Fläche erstrecken (siehe auch Motivkatalog "Interpane/ ipadecor" - der Fa. Interpane Sicherheitsglas, 31135 Hildesheim / 01/96-OdH). Stellt das zu verglasende Bauwerk jedoch aufgrund seiner geometrischen Fassadengestaltung auch besondere Anforderungen an die Flächengeometrie der erforderlichen Glasscheiben, so daß die Fassadenverkleidung nicht aus Glasscheiben eines einheitlichen Maßes (z.B. mit quadratischer oder rechteckiger Außenkontur) zusammengesetzt werden kann, sondern die Glasscheiben unterschiedliche Außenkonturen (Abmessungen, insbesondere Länge und/oder Breite, und/oder Flächengeometrien, wie rechteckig, quadratisch, dreieckig, trapezförmig u.a.) aufweisen und bis an den Rand mit dem Dekor bedruckt werden müssen, so ist selbst unter Berücksichtigung der aus der DE 41 09 707 C1 bekannten Lösung für jede dieser Glasscheiben eine separate Gestaltung der Tischkanäle und der Siebschablone und die damit im Zusammenhang stehenden Umrüstzeit erforderlich, da Toleranzen und Positionierungsabweichungen der Glasscheiben nur im Rahmen der Breite der kanalartigen Vertiefung ausgeglichen werden können und somit nur einen geringen Spielraum gewährleisten. Würden die unterschiedliche Außenkonturen aufweisenden Glasscheiben nur mit einer Siebschablone bedruckt werden, so muß deren für die Druckfarbe durchlässige Teil (= Druckfläche) der Siebschablone zwingend der Glasscheibe mit der größten Dekorbreite und -länge angepaßt sein. Wird nach dem Bedrucken einer ersten und weniger breiten und/oder langen Glasscheibe, eine zweite Glasscheibe mit größerer Dekorbreite und/oder -länge bedruckt, so bleibt auch an den Stellen der Druckfläche, an welchen die Druckfläche über die Umrisse des Dekors der ersten bedruckten Glasscheibe hinausragt und somit nicht im Bereich der kanalartigen Vertiefung mit angeschlossener Überdruckquelle (Saugluftstrom) liegt, überschüssige Druckfarbe in den Maschen der Siebschablone zurück. Die damit fehlende Anpassung der kanalartigen Vertiefung in der Tischplatte und der Druckfläche der Siebschablone an die Abmessungen und Flächengeometrien der zu bedruckenden Gegenstände führt für den nachfolgenden Druckvorgang der zweiten, eine größere Dekorbreite und/oder -länge aufweisenden Glasscheibe unumgänglich dazu, daß den Bereichen der Siebschablone mit bereits aus dem vorangehenden Druckvorgang existierenden Farbüberschuß, weitere Druckfarbe durch die Rakel zugeführt wird. In der Folge kommt es zu unscharfen Druckbilder der Dekore bis hin zu Geisterbildern und damit Ausschuß.The material has been used in modern architecture for some time Glass reinforces use. In particular, facade cladding veneered over large areas with safety glass panes. These glass panes have to increase the optical effect regular decors from flat-bed screen printing ceramic stoving colors, whereby these decors over one Part of the glass pane surface (e.g. dot grid, strip grid, check grid, Vertical stripes, horizontal stripes or similar) or over the entire surface extend this area (see also motif catalog "Interpane / ipadecor" - from Interpane Sicherheitsglas, 31135 Hildesheim / 01/96-OdH). However, represents the building to be glazed due to its Geometric facade design also has special requirements to the surface geometry of the required glass panes, so that the facade cladding is not made of glass panes of a uniform Dimensions (e.g. with a square or rectangular outer contour) can be different, but the glass panes Outer contours (dimensions, in particular length and / or width, and / or surface geometries, such as rectangular, square, triangular, trapezoidal, etc.) and to the edge with the Decor must be printed, so even taking into account the solution known from DE 41 09 707 C1 for each of these glass panes a separate design of the table channels and the screen template and the related changeover time required because tolerances and positioning deviations of the Glass panes only within the width of the channel-like recess can be compensated and thus only a small scope guarantee. Would have the different outer contours Glass panes can only be printed with a stencil, the part that is permeable to the printing ink (= printing surface) the screen template, the glass pane with the largest decorative width and length must be adjusted. Will be after printing a first and less wide and / or long sheet of glass, a second Glass pane printed with a larger decor width and / or length, see above also remains at the points on the printing surface where the printing surface on the outline of the decor of the first printed glass pane protrudes and therefore not in the area of channel-like Deepening with connected pressure source (suction air flow) excess ink in the mesh of the screen template back. The lack of adaptation of the channel-like recess in the table top and the printing surface of the screen template to the Dimensions and surface geometries of the objects to be printed leads to a larger one for the subsequent printing process Decal width and / or length of glass pane unavoidable to ensure that the areas of the screen template with from the previous Existing color excess, further Ink is fed through the squeegee. As a result, it happens too fuzzy print images of the decors up to ghost images and with it committee.

Die Nachteile dieser bekannten Lösung bestehen darin, daß diese durch die Entstehung von unsauberen Druckbildern nicht zum Bedrukken mit Dekoren von ebenflächigen Gegenständen, insbesondere Glasscheiben, unterschiedlicher Außenkonturen (Abmessungen und/oder Flächengeometrien) mit ein- und demselben Drucksieb geeignet ist, wodurch für jeden der Gegenstände eine Anpassung der Tischplatte und der Siebschablone erfolgen muß. Weiterhin ist ein großer technischer Aufwand für die Reinigung der Siebschablone durch die benötigte Absaugeinrichtung erforderlich.The disadvantages of this known solution are that it not to be printed due to the creation of unclean printed images with decorations of flat objects, especially glass panes, different outer contours (dimensions and / or Surface geometries) with one and the same printing screen, whereby an adjustment of the table top for each of the objects and the screen template must be made. Furthermore, a great technical one Effort for cleaning the screen template by the required Suction device required.

Weitere Sieddruckverfahren bzw. Siebdruckvorrichtungen mit einer hohlzylindrischen Siebschablone sind ans den Dokumenten GB-A-1526213 und WO-A-95/18020 bekannt.Other boiling printing processes or screen printing devices with a hollow cylindrical Screen templates are known from documents GB-A-1526213 and WO-A-95/18020.

Gegenstand der vorliegenden Erfindung ist ein Verfahren mit dem ebenflächige Gegenstände, insbesondere Glasscheiben, unterschiedlicher Außenkonturen (hinsichtlich der Abmessungen und/oder Flächengeometrien) mit ein- und derselben Siebschablone bedruckt werden können, wobei auch immer ein sauberes Druckbild gewährleistet werden soll. Gleichzeitig wird eine einfach aufgebaute Vorrichtung zur Durchführung des Verfahren vorgeschlagen.The present invention relates to a method with the flat objects, especially glass panes, different Outer contours (in terms of dimensions and / or surface geometries) printed with one and the same screen template can be guaranteed, whereby always a clean print image shall be. At the same time, a simply constructed device proposed to carry out the procedure.

Erfindungsgemäß wird dies durch die Merkmale des Patentanspruchs 1 erreicht.According to the invention, this is achieved by the features of patent claim 1 reached.

Die Vorteile der Erfindung bestehen darin, daß ebenflächige Gegenstände, insbesondere Glasscheiben, unterschiedlicher Außenkonturen (hinsichtlich der Abmessungen und/oder Flächengeometrien) kontinuierlich oder diskontinuierlich mit ein- und derselben Siebschablone zum Aufbringen eines gleichen Dekors bedruckt werden können, und dabei auch immer ein sauberes Druckbild gewährleistet werden kann, da überschüssige Druckfarbe vor Beginn des nächsten Druckvorganges unabhängig davon, an welcher Stelle der Druckfläche diese nach Abschluß eines vorhergehenden Druckvorganges vorhanden ist, beseitigbar ist. Demgemäß steht die Druckfläche der Siebschablone für einen folgenden Druckvorgang völlig druckfarbenfrei zur Verfügung. The advantages of the invention are that flat objects, especially glass panes with different outer contours (in terms of dimensions and / or surface geometries) continuously or discontinuously with one and the same screen template can be printed to apply the same decor, and always ensure a clean print image can, because there is excess ink before the next printing process regardless of where on the printing surface this available after completion of a previous printing process is, can be eliminated. Accordingly, the printing surface of the screen template completely free of printing ink for a subsequent printing process Available.

Vorteilhafte verfahrensmäßige Weiterbildungen der Erfindung sind in den Patentansprüchen 2 bis 4 charakterisiert.Advantageous procedural developments of the invention are characterized in claims 2 to 4.

Außerdem gewährleistet die vorrichtungstechnische Ausführungsform der Erfindung nach Patentanspruch 5 einen äußerst einfachen Aufbau der Vorrichtung unter Nutzung ohnehin baugleicher Funktionselemente (zweite Rakel) sowie einen wirkungsvollen Farbaustrag aus der Druckfläche der Siebschablone auf die Farbabtragwalze.In addition, the device-technical embodiment ensures the invention according to claim 5 an extremely simple structure the device using functional elements that are identical in any case (second squeegee) and an effective color discharge from the Printing area of the screen stencil on the ink removal roller.

Die Erfindung soll nachfolgend an einem Ausführungsbeispiel und zugehörigen Zeichnungen näher erläutert werden.The invention is based on an embodiment and associated drawings are explained in more detail.

Es zeigen:

Fig. 1
eine vereinfachte Seitenansicht der erfindungsgemäßen Vorrichtung, wobei eine erste Glasscheibe 5 bedruckt wird
Fig. 2
eine vereinfachte perspektivische Ansicht der erfindungsgemäßen Vorrichtung mit Endlosfördereinrichtung, wobei eine zweite der Glasscheiben 5' bedruckt wird
Show it:
Fig. 1
a simplified side view of the device according to the invention, wherein a first glass sheet 5 is printed
Fig. 2
a simplified perspective view of the device according to the invention with endless conveyor, wherein a second of the glass sheets 5 'is printed

Die in der Fig. 1 dargestellte Vorrichtung besteht aus einer rotierenden, hohlzylindrischen und mit einer Druckfläche 1 versehenen Siebschablone 2, die mit einer Farbabtragwalze 3 in Wirkverbindung steht. Dabei ist die Druckfläche 1 mindestens der größten Breite 4 des auf die als Glasscheiben ausgebildeten Gegenstände 5 zu übertragenden Dekors 6 angepaßt. Im Innenraum 7 der Siebschablone 2 sind zwei Rakel 8, 9 und eine nicht dargestellte Zuführvorrichtung für die Druckfarbe (keramische Einbrennfarbe) 10 befindlich, wobei die erste Rakel 8 auf der der zu bedruckenden Glasscheibe 5 zugewandten Seite und die zweite Rakel 9 auf der der Farbabtragwalze 3 zugewandten Seite angeordnet ist und die Farbabtragwalze 3 einen Farbschaber 11 aufweist. Unterhalb der Siebschablone 2 ist eine Endlosfördereinrichtung 12 in Gestalt eines umlaufenden Förderbandes angeordnet, auf der die Glasscheiben 5 bis 5'''' positioniert sowie unter Wahrung eines definierten Abstandes 13 aufgelegt und der Siebschablone 2 zum Bedrucken mit einem gleichen Dekor 6 kontinuierlich oder diskontinuierlich zuführbar sind. Dabei entspricht die Fördergeschwindigkeit des Förderbandes der Umlaufgeschwindigkeit der Siebschablone 2 und der Farbabtragwalze 3.The device shown in FIG. 1 consists of a rotating, hollow cylindrical and provided with a pressure surface 1 Screen template 2, which is in operative connection with an ink removal roller 3 stands. The printing area 1 is at least the largest Width 4 of the objects designed as glass panes 5 adapted to be transferred decor 6. In the interior 7 of the screen template 2 are two doctor blades 8, 9 and a feed device, not shown for the printing ink (ceramic stoving ink) 10 located, the first doctor blade 8 on the one to be printed Glass pane 5 facing side and the second doctor 9 on the Ink removal roller 3 is arranged side and the ink removal roller 3 has a paint scraper 11. Below the screen template 2 is an endless conveyor 12 in the form of a revolving conveyor belt arranged on which the glass panes 5 up to 5 '' '' and maintaining a defined distance 13 placed and the stencil 2 for printing with a same decor 6 can be fed continuously or discontinuously are. The conveyor speed corresponds to the conveyor belt the rotational speed of the screen template 2 and the ink removal roller 3rd

Wird nunmehr eine erste, z.B. quadratische Glasscheibe 5 mit einer gegenüber der Druckfläche 1 der Siebschablone 2 geringeren Breite 4' unter die Siebschablone 2 bewegt, so bewirkt die erste Rakel 8 die Übertragung der in den Maschen der Druckfläche 1 der Siebschablone 2 befindlichen Druckfarbe 10 auf die Glasscheibe 5 zur Bildung eines Dekors 6. Durch die jedoch bereits vorher eingeleitete Rotation der Siebschablone 2 ist ein Teil der Druckfläche 1 ebenfalls mit Druckfarbe 10' versehen worden, der sich vor der Kontaktierung der Glasscheibe 5 mit der Siebschablone 2 bereits in Richtung der Farbabtragwalze 3 bewegt und damit dessen Druckfarbe 10' nicht auf die Glasscheibe 5 gedruckt werden konnte. Gelangt dieser farbangereicherte Bereich der Druckfläche 1 nachfolgend in Kontakt mit der ebenfalls rotierenden Farbabtragwalze 3, so wird durch die zweite Rakel 9 die überschüssige Druckfarbe 10' auf die Oberfläche der Farbabtragwalze 3 übertragen und somit aus der Druckfläche 1 der Siebschablone 2 entfernt. Dabei säubert der der Farbabtragwalze 3 zugeordnete Farbschaber 11 kontinuierlich deren Oberfläche von der übernommenen Druckfarbe 10' und führt diese in das nicht dargestellte Reservoir der Zuführvorrichtung für die Druckfarbe 10 zur Weiterverwertung zurück.
Beim Bedrucken dieser ersten Glasscheibe 5 werden außerdem sowohl die seitlichen Bereiche 14 der Druckfläche 1, die über die Breite der Glasscheibe 5 hinausragen als auch der Bereich, der durch den Abstand 13 zur zweiten zu bedruckenden Glasscheibe 5' definiert ist (siehe auch Fig. 2), mit Druckfarbe 10 versehen. Auch wenn diese Bereiche in Kontakt mit der Farbabtragwalze 3 gelangen, wird deren überschüssige Druckfarbe 10' in der oben beschriebenen Art und Weise aus der Druckfläche 1 entfernt und rückgeführt. Damit steht die Druckfläche 1 der Siebschablone 2 gemäß Fig. 2 für den sich anschließenden Druckvorgang der zweiten, eine gegenüber der ersten Glasscheibe eine größere Breite 4 aufweisenden und beispielhaft gleichzeitig die Glasscheibe (z.B. rechteckige Glasscheibe 5') mit der größten Dekorbreite aller Scheiben darstellenden Glasscheiben 5 bis 5'''' wieder druckfarbenfrei und somit für die Sicherung eines sauberen Druckbildes des Dekors 6 zur Verfügung.If a first, for example square, glass sheet 5 with a width 4 ′ smaller than the printing surface 1 of the screen stencil 2 is now moved under the screen stencil 2, the first squeegee 8 causes the transfer of the printing ink 10 located in the meshes of the printing surface 1 of the screen stencil 2 the glass pane 5 to form a decoration 6. However, due to the previously initiated rotation of the screen stencil 2, part of the printing surface 1 has also been provided with printing ink 10 ', which is already in the direction of the ink removal roller before the glass pane 5 comes into contact with the screen stencil 2 3 moved and thus its printing ink 10 'could not be printed on the glass sheet 5. If this color-enriched area of the printing surface 1 subsequently comes into contact with the likewise rotating ink-removing roller 3, the excess printing ink 10 ′ is transferred to the surface of the ink-removing roller 3 by the second doctor blade 9 and thus removed from the printing surface 1 of the screen stencil 2. The ink scraper 11 assigned to the ink removal roller 3 continuously cleans its surface from the ink 10 'and takes it back into the reservoir (not shown) of the feed device for the ink 10 for further use.
When printing on this first glass pane 5, both the lateral regions 14 of the printing surface 1, which protrude beyond the width of the glass pane 5, and the region which is defined by the distance 13 from the second glass pane 5 'to be printed (see also FIG. 2 ), provided with printing ink 10. Even if these areas come into contact with the ink removal roller 3, its excess printing ink 10 'is removed from the printing surface 1 and returned in the manner described above. The printing surface 1 of the screen template 2 according to FIG. 2 thus stands for the subsequent printing process of the second glass pane, which has a greater width 4 than the first glass pane and, for example, the glass pane (for example rectangular glass pane 5 ') with the largest decorative width of all the glass panes 5 to 5 '''' again free of printing inks and thus available for securing a clean print image of decor 6.

Demgemäß arbeitet das Siebdruckverfahren derartig, daß eine rotierende, hohlzylindrische Siebschablone 2 verwendet wird, deren Druckfläche 1 mindestens der größten Breite 4 des auf die Gegenstände 5 bis 5'''' zu übertragenden Dekors 6 angepaßt ist und nachfolgend die nicht auf den Gegenstand 5 bis 5'''' übertragene Druckfarbe 10' nach dem Druckvorgang mechanisch aus der Druckfläche 1 der Siebschablone 2 entfernt wird. Dabei erfolgt die mechanische Entfernung der Druckfarbe 10' aus der Druckfläche 1 der Siebschablone 2 mittels einer Rakel 9 durch Übertragung auf eine Farbabtragwalze 3, von welcher die übernommene Druckfarbe 10' mittels eines Farbschabers 11 entfernt und in das Reservoir der Zuführvorrichtung für die Druckfarbe 10 zurückgeleitet wird. Außerdem werden die Glasscheiben 5 bis 5'''' auf einer Endlosfördereinrichtung 12 liegend der Siebschablone 2 zum Bedrucken zugeführt, wobei das Auflegen der Glasscheiben 5 bis 5'''' auf die Endlosfördereinrichtung 12 kontinuierlich oder diskontinuierlich erfolgen kann. Accordingly, the screen printing process works in such a way that a rotating, hollow cylindrical screen template 2 is used, the Print area 1 at least the largest width 4 of the on the objects 5 to 5 '' '' to be transferred decorations 6 and hereinafter the one not transferred to item 5 to 5 '' '' Printing ink 10 'mechanically out of the printing area after the printing process 1 of the screen template 2 is removed. The mechanical Removal of the printing ink 10 'from the printing surface 1 of the Screen template 2 by means of a doctor blade 9 by transfer to a Ink removal roller 3, from which the ink 10 'taken over by a paint scraper 11 removed and into the reservoir of the feeder for ink 10 is returned. In addition, the glass sheets 5 to 5 '' '' on an endless conveyor 12 fed to the screen stencil 2 for printing, placing the glass panes 5 to 5 '' '' on the Endless conveyor device 12 continuously or discontinuously can be done.

BezugszeichenlisteReference list

11
Druckfläche in 2Print area in 2nd
22nd
SiebschabloneScreen template
33rd
FarbabtragwalzeInk removal roller
44th
größte Breitegreatest width
4'4 '
Breitewidth
55
Gegenstand/GlasscheibeObject / glass pane
5'5 '
Gegenstand/GlasscheibeObject / glass pane
5''5 ''
Gegenstand/GlasscheibeObject / glass pane
5'''5 '' '
Gegenstand/GlasscheibeObject / glass pane
5''''5 '' ''
Gegenstand/GlasscheibeObject / glass pane
66
Dekordecor
77
Innenraum von 2Interior of 2
88th
RakelSqueegee
99
RakelSqueegee
1010th
DruckfarbePrinting ink
10'10 '
DruckfarbePrinting ink
1111
FarbschaberPaint scraper
1212th
EndlosfördereinrichtungEndless conveyor
1313
Abstanddistance
1414
BereichArea

Claims (5)

  1. Screen printing method for printing a decor on plane objects, in particular glass panes, wherein a surface contact is produced between the printing surface of a screen printing stencil and the object to be printed,
    characterized by the fact
    that a rotating screen printing stencil (2) in the form of a hollow cylinder is used, wherein the printing surface (1) of said screen printing stencil is adapted to at least the greatest width (4) of the decor (6) to be printed onto the objects (5 - 5''''), and wherein the printing color (10') that is not transferred onto the object (5 - 5'''') is mechanically removed from the printing surface (1) of the screen printing stencil (2) after the printing process.
  2. Screen printing method for printing a decor on plane objects, in particular glass panes, according to Claim 1,
    characterized by the fact
    that the mechanical removal of the printing color (10') from the printing surface (1) of the screen printing stencil (2) is realized by transferring the printing color onto a color removal roller (3) by means of a squeegee (9).
  3. Screen printing method for printing a decor on plane objects, in particular glass panes, according to Claim 2,
    characterized by the fact
    that the transferred printing color (10') is removed from the color removal roller (3) by means of a color scraper (11) and returned to the reservoir of the device for supplying the printing color (10).
  4. Screen printing method for printing a decor on plane objects, in particular glass panes, according to Claim 1,
    characterized by the fact
    that the objects (5 - 5'''') are fed to the screen printing stencil (2) while lying on an endless conveyor (12).
  5. Device for carrying out the method according to Claim 1,
    characterized by the fact
    that a rotating screen printing stencil (2) in the form of a hollow cylinder is designed such that it is functionally connected to a color removal roller (3), wherein the screen printing stencil is equipped with two squeegees (8, 9) and a device for supplying the printing color (10) in its interior (7), wherein the first squeegee (8) is arranged on the side that faces the objects (5 - 5'''') to be printed and the second squeegee (9) is arranged on the side that faces the color removal roller (3), and wherein the color removal roller (3) contains a color scraper (11).
EP99113909A 1998-07-18 1999-07-16 Screen printing method for decorative printing flat objects, especially glass panes, and apparatus for carrying out the method Expired - Lifetime EP0974458B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19832414 1998-07-18
DE19832414A DE19832414C2 (en) 1998-07-18 1998-07-18 Screen printing method for printing flat objects, in particular glass panes, with a decor and device for carrying out the method

Publications (2)

Publication Number Publication Date
EP0974458A1 EP0974458A1 (en) 2000-01-26
EP0974458B1 true EP0974458B1 (en) 2001-12-05

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EP99113909A Expired - Lifetime EP0974458B1 (en) 1998-07-18 1999-07-16 Screen printing method for decorative printing flat objects, especially glass panes, and apparatus for carrying out the method

Country Status (4)

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EP (1) EP0974458B1 (en)
AT (1) ATE210018T1 (en)
DE (2) DE19832414C2 (en)
ES (1) ES2169582T3 (en)

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Also Published As

Publication number Publication date
DE19832414C2 (en) 2000-07-20
ATE210018T1 (en) 2001-12-15
DE59900484D1 (en) 2002-01-17
DE19832414A1 (en) 2000-01-27
ES2169582T3 (en) 2002-07-01
EP0974458A1 (en) 2000-01-26

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