EP3626470B1 - Verfahren zum digitalen drucken von bildern auf glas und system unter verwendung dieses druckverfahrens - Google Patents

Verfahren zum digitalen drucken von bildern auf glas und system unter verwendung dieses druckverfahrens Download PDF

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Publication number
EP3626470B1
EP3626470B1 EP19198398.0A EP19198398A EP3626470B1 EP 3626470 B1 EP3626470 B1 EP 3626470B1 EP 19198398 A EP19198398 A EP 19198398A EP 3626470 B1 EP3626470 B1 EP 3626470B1
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European Patent Office
Prior art keywords
printing
strips
glass pane
images
strip
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EP19198398.0A
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English (en)
French (fr)
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EP3626470A1 (de
Inventor
Gianni Maitan
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GE MA TA SpA
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GE MA TA SpA
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0041—Digital printing on surfaces other than ordinary paper
    • B41M5/0047—Digital printing on surfaces other than ordinary paper by ink-jet printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0015—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
    • B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0015—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
    • B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
    • B41J11/0021—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation
    • B41J11/00216—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation using infrared [IR] radiation or microwaves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/28—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for printing downwardly on flat surfaces, e.g. of books, drawings, boxes, envelopes, e.g. flat-bed ink-jet printers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0041—Digital printing on surfaces other than ordinary paper
    • B41M5/007—Digital printing on surfaces other than ordinary paper on glass, ceramic, tiles, concrete, stones, etc.

Definitions

  • the invention concerns a method for the digital printing of images on glass.
  • the invention concerns also a system which carries out said digital printing using said method.
  • the process of digital printing on glass is a technology that uses dedicated software which reads the information related to images stored in digital supports and manages an ink jet printer which prints said images on a glass substrate.
  • a system implementing said printing process substantially comprises a work surface on which the glass pane to be printed is positioned and a printing head provided with a plurality of spray heads designed to spray inks of different colours.
  • Spraying inks of different colours combined with one another makes it possible to obtain the composite colours of the images stored in the digital support.
  • the work surface is usually constituted by a suctioned surface on which the glass pane is fixed through negative pressure, while the printing head is associated with Cartesian linear guides along which it is moved by drive means.
  • the printing head is then moved according to a Cartesian movement and carries out the printing operation on the underlying glass pane, covering it with strips that are laid adjacent to one another.
  • Each strip thus constitutes a part of the final image, in the colour defined by the colour combination created by the ink jet heads which are selected by the dedicated software during the printing process.
  • each layer being laid with a thin thickness, dries rapidly without spreading beyond the perimeter of the image and substantially serves the function of a primer, which favours the gripping and stabilization of the successive ink layer superimposed to it.
  • the software reads the information stored in the digital supports and manages the printing head in such a way that the image or images to be printed is/are composed by covering the surface of the glass pane with a plurality of printing strips, where each strip covers part of the previously laid strip and in turn is partially covered by the successive strip.
  • Figure 1 This situation is schematically represented by way of example in Figure 1 , in which it is supposed that the image be printed on the underlying glass pane V using printing strips arranged crosswise with respect to the glass pane along the transverse axis X and partially superimposed on each other in bands moving along the longitudinal axis Y orthogonal to the transverse axis X.
  • each strip will be defined with a quantity of ink equal to 1/3 of the total quantity.
  • the first strip a is printed, the second strip b is partially superimposed on it and the third strip c is partially superimposed on the latter, spacing the strips from one another according to the longitudinal direction Y by a pitch p equal to 1/3 of the width of each strip.
  • the superimposed strip s which derives from the superimposition of the common sections of strips a, b, c, will have the desired thickness, equal to the sum of the thicknesses of the three strips a, b, c.
  • a superimposed strip s', s", s′′′ is obtained, whose thickness is equal to the sum of the thicknesses of three strips and equal to the thickness of the superimposed strip s previously obtained.
  • the printing operation continues in a repetitive manner according to the criterion described above, until covering the surface of the glass pane V completely, and at the end of the process a print will be obtained which results from the superimposition of three printing surfaces, each one of which has a thickness equal to 1/3 of the total thickness of the final print.
  • This printing method poses the drawback that the printing time of each strip is rather short and therefore it occurs that a strip is printed when the ink of the underlying strip has not dried completely yet.
  • the document US 2017/107388 A1 describes an ink composition comprising a component that is suited to polymerize under the action of UV rays for printing images on various materials, among which glass, and also describes a printing system in which a printing head is moved with respect to a support according to a Cartesian system.
  • the document US 2013/222498 A1 describes a digital printer for glass panes comprising means for moving a printing head according to a Cartesian system.
  • the present invention intends to solve the problem illustrated above by providing a method for the digital printing of words and/or images on glass which, compared to the prior art, significantly reduces the presence of blurs along the edge that delimits said words or images.
  • said method improves the overall quality of glass printing compared to the known methods, since it makes it possible to obtain sharper and more defined images.
  • the method that is the subject of the invention makes it possible to digitally print words and/or images on a glass pane which is schematically represented in Figure 3 , where it is indicated as a whole by V, by means of an ink jet printing head.
  • the printing method uses dedicated software which is configured to interpret digital information recorded in apposite memory supports and defining the words and/or images to be printed, and to control the printing head in order to print said words and/or images on the glass pane V.
  • the digital printing of the words and/or images is obtained by superimposing a plurality of printing surfaces 1; 2 on each other and requires the following operations:
  • Figure 3 shows two printing surfaces of the glass pane V which are respectively indicated by the reference numerals 1 and 2 and are shown slightly staggered with respect to each other in order to make the drawing easier to understand, and each one of which is obtained by means of printing strips, respectively 1a and 2a, wherein the printing strips of the same printing surface are in contact with each other along a common edge, respectively 1b and 2b.
  • each common edge 1 b and 2b is facing and in contact with the printing strip belonging to the adjacent printing surface.
  • the method of the invention comprises a plurality of preparatory operations which are carried out before printing the printing surfaces digitally.
  • An initial reference point is then defined, for example the origin O of the Cartesian reference system and thus the point of intersection of the axes X and Y, however any other point different from the origin O can be selected as initial reference point.
  • the printing head is positioned at the level of the initial reference point O shown in Figure 4 and is moved forward along one of the axes, for example along the first axis X, to print a printing strip 1a with width 1c, as shown in Figure 4 .
  • the printing head is repositioned at the level of the initial reference point O and moved along the second axis Y by a pitch equal to the width 1c of the previous printing strip 1a.
  • the printing head is then moved forward once again, along the direction of the first axis X, to obtain another printing strip 1a, as can be observed in Figure 5 , wherein said printing strip, given that the pitch and the width 1c of the previously printed printing strip 1a are the same, will be adjacent to and in contact with the latter along the common edge 1b.
  • each common contact edge 1b between the printing strips 1a of the printing surface 1 will be covered by a respective printing strip 2a of the overlying printing surface 2 and in the same way each common contact edge 2b between the printing strips 2a of the overlying printing surface 2 will be in contact with a corresponding printing strip 1a of the underlying printing surface 1.
  • the user can decide the number of printing surfaces which he intends to use to print the image on the glass pane V and conveniently distribute the total thickness of the ink used for the final image among the various printing surfaces.
  • the time necessary to obtain the printing surface 1 is sufficiently long to ensure that, in combination with the limited thickness of the ink used to print said printing surface 1, each printing strip 2a of the overlying printing surface 2 is laid over underlying printing strips 1a that are already dry.
  • each printing surface serves as a primer for the printing surface that is placed over it and this makes it possible to eliminate almost completely the presence of blurs along the edge that delimits the words and/or images to be printed.
  • the method of the invention thus achieves the object of the invention to significantly improve the quality of the final print.
  • all the printing strips that define the same printing surface have the same print thickness and all the printing surfaces are defined by printing strips that have the same print thickness.
  • one or more of said printing surfaces are defined by printing strips having different print thicknesses compared to the printing strips that define the adjacent printing surface.
  • the number of printing surfaces and the thickness of the ink with which each of them is printed are selected by the operator in order to optimize the quality of the final print.
  • the digital printing method described above is implemented in a system for the digital printing of images and/or drawings and/or words on glass panes which is illustrated as a whole in the axonometric view of Figure 8 and in the detailed views of Figures 9 and 10 , where it is indicated as a whole by 50.
  • the system comprises a work surface 51 configured to support a glass pane V suited to be digitally printed with said images and/or words and/or said drawings which are printed thereon by means of a printing head 52 provided with ink jet spray heads 52a.
  • the glass pane V is placed in the desired printing position through optical means 53, preferably but not necessarily laser emitters, which are associated with the printing head 52, as can be observed in Figure 9 .
  • Cartesian structure 54 comprising one pair of parallel longitudinal ways 55 spaced from each other and a transversal carriage 56 supported at its ends by the longitudinal ways 55 and in turn supporting the printing head 52.
  • the system is provided with drive means designed to move the transversal carriage 56 along the longitudinal ways 55 that define the longitudinal axis Y and the printing head 52 along the transversal carriage 56 that defines the transverse axis X.
  • the transversal carriage 56 is associated with drying means 59 which are arranged along the transversal carriage 56 and are preferably but not necessarily constituted by infrared lamps.
  • the drying means 59 occupy the whole width of the work surface 51 along the transverse axis X and during the movement of the transversal carriage 56 along the longitudinal ways 55 dry the ink that has been laid on the glass pane V.
  • the transverse drive means move the printing head 52 according to the transverse axis X to print each printing strip 1a, 2a on the glass pane V
  • the longitudinal moving means move the transversal carriage 56 according to the longitudinal axis Y to arrange the printing strips one after the other according to the direction defined by said longitudinal axis Y until the glass pane V has been completely covered according to the described method.
  • the combination of the movements produced by the transverse and longitudinal drive means 57 makes it possible to manoeuvre the optical means 53 to position the glass pane V correctly in the desired operating position and to define the coordinates of the initial reference point O.
  • a numerical control device manages the printing process through dedicated software which reads the information related to the words and/or images to be printed which are stored in digital supports and prints said words and/or images on the glass pane V, controlling the drive means that move the printing head 52 and manage the ejection of ink by the spray heads 52a according to the method of the invention described above.
  • the digital printing method and the system operating according to said method achieve the set objects, that is, the objects to improve the quality of the printed word and/or image.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Ink Jet (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Printing Methods (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Claims (9)

  1. Verfahren zum digitalen Drucken von Wörtern und/oder Bildern auf eine Glasscheibe (V) mittels einer speziellen Software, die auf speziellen Datenträgern aufgezeichnete digitale Informationen, welche die zu druckenden besagten Wörter und/oder besagten Bilder definieren, interpretiert und einen Tintenstrahldruckkopf steuert, um die besagten Wörter und/oder Bilder auf die besagte Glasscheibe (V) zu drucken, wobei das besagte digitale Drucken der besagten Wörter und/oder Bilder durch Überlagerung einer Vielzahl von Druckflächen (1; 2) durch die folgenden Vorgänge erhalten wird:
    - Herstellen jeder der besagten Druckflächen (1; 2) durch Bedrucken einer Vielzahl von koplanaren Druckstreifen (1a; 2a), die nebeneinander angeordnet sind, wobei jeder der besagten Druckstreifen (1a; 2a) mit dem benachbarten Druckstreifen entlang einer gemeinsamen Längskante (1b; 2b) Kontakt hat;
    - Überlagerung der besagten Druckflächen (1; 2) in der Weise, dass jede gemeinsame Längskante (1b; 2b), die zu jeglicher der besagten Druckflächen (1; 2) gehört, einem Druckstreifen (1a; 2a), der zu der darüber und/oder darunter liegenden Druckfläche (1; 2) gehört, zugewandt und in Kontakt mit diesem angeordnet ist,
    wobei das besagte Verfahren eine Vielzahl von Vorbereitungsvorgängen umfasst, die vor dem digitalen Bedrucken der besagten Druckflächen (1; 2) durchgeführt werden und die folgenden Vorgänge umfassen:
    - Auflegen der besagten Glasscheibe (V) auf eine Arbeitsfläche;
    - Definition eines kartesischen Bezugssystems für die besagte Glasscheibe (V), das aus einer ersten Achse (X) und einer zweiten Achse (Y) besteht;
    - Definition eines anfänglichen Bezugspunktes (O);
    - Positionierung des besagten Druckkopfes auf der Höhe des besagten anfänglichen Bezugspunktes (O),
    wobei jede der besagten Druckflächen (1; 2) durch die folgenden Vorgänge erhalten wird:
    - Vorschub des besagten Druckkopfs entlang der besagten ersten Achse X/ zweiten Achse Y, um einen Druckstreifen (1a; 2a) auf die besagte Glasscheibe (V) zu drucken;
    - Neupositionierung des besagten Druckkopfes auf der Höhe des besagten anfänglichen Bezugspunktes (O);
    - Bewegen des besagten Druckkopfes entlang der besagten zweiten Achse Y/ersten Achse X um einen Abstand, der der Breite (1c) des besagten Druckstreifens (1a; 2a) entspricht;
    - Vorschub des Druckkopfes, Neupositionierung desselben und mehrmalige Bewegung desselben bis zur Fertigstellung des Drucks der besagten Druckfläche (1; 2) auf die besagte Glasscheibe (V),
    dadurch gekennzeichnet, dass, um eine andere Druckfläche (2) zu erhalten, die der vorhergehenden überlagert ist und ebenfalls aus einer Vielzahl von Druckstreifen (2a) besteht, jedes Mal dafür gesorgt werden muss, dass der besagte Druckkopf, der entlang der besagten zweiten Achse Y und in Bezug auf den besagten anfänglichen Bezugspunkt (O) bewegt wurde, in einem Abstand (4) neu positioniert wird, der kürzer ist als die besagte Breite (1c) des Druckstreifens (1a), der zu der besagten vorhergehenden Druckfläche (1) gehört; auf diese Weise wird jede gemeinsame Kontaktkante (1b) zwischen den Druckstreifen (1a) der vorhergehenden Druckfläche (1) von einem entsprechenden Druckstreifen (2a) der darüber liegenden Druckfläche (2) abgedeckt, und auf die gleiche Weise wird jede gemeinsame Kontaktkante (2b) zwischen den Druckstreifen (2a) der darüber liegenden Druckfläche (2) mit einem entsprechenden Druckstreifen (1a) der darunter liegenden Druckfläche (1) in Kontakt sein.
  2. Verfahren nach Patentanspruch 1, dadurch gekennzeichnet, dass alle Druckstreifen (1a; 2a), welche dieselbe Druckfläche (1; 2) definieren, dieselbe Druckstärke aufweisen.
  3. Verfahren nach jeglichem der vorhergehenden Patentansprüche, dadurch gekennzeichnet, dass alle Druckflächen (1; 2) durch Druckstreifen (1a; 2a) definiert werden, die dieselbe Druckstärke aufweisen.
  4. Verfahren nach jeglichem der vorhergehenden Patentansprüche, dadurch gekennzeichnet, dass eine oder mehrere der besagten Druckflächen (1; 2) durch Druckstreifen (1a; 2a) definiert werden, die im Vergleich zu den Druckstreifen (1a; 2a), welche die benachbarte Druckfläche (1; 2) definieren, unterschiedliche Druckstärke aufweisen.
  5. Verfahren nach jeglichem der vorangehenden Patentansprüche, dadurch gekennzeichnet, dass es die folgenden Vorgänge umfasst:
    - Definition der Anzahl der besagten Druckflächen (1; 2) zum Drucken des Bildes auf die besagte Glasscheibe (V);
    - effiziente Verteilung der ganzen Stärke der Tinte, die das endgültige Bild erzeugt, auf die besagten Druckflächen (1; 2);
    wobei die besagten Vorgänge so gestaltet sind, dass die zu einer Druckfläche (1) gehörenden Druckstreifen (1a) trocknen, bevor ein zu der darüber liegenden Druckfläche (2) gehörender Druckstreifen (2a) auf die besagten Druckstreifen (1a) gelegt wird.
  6. System (50) für den digitalen Druck von Wörtern und/oder Bildern auf Glas, umfassend:
    - eine Arbeitsfläche (51), die so konfiguriert ist, dass sie eine Glasscheibe (V) aufnimmt, die mit Wörtern und/oder Bildern digital bedruckt werden kann;
    - optische Mittel (53), die so konfiguriert sind, dass sie die besagte Glasscheibe (V) auf der besagten Arbeitsfläche (51) positionieren, bevor der besagte Druckvorgang der besagten Wörter und/oder Bilder ausgeführt wird;
    - einen Druckkopf (52), der mit Tintenstrahlsprühköpfen (53a) versehen ist;
    - eine kartesische Struktur (54), die auf der besagten Arbeitsfläche (51) angeordnet und mit dieser koplanar ist und so konfiguriert ist, dass sie den besagten Druckkopf (52) aufnimmt;
    - Antriebsmittel, die so konfiguriert sind, dass sie den besagten Druckkopf (52) auf der kartesischen Struktur (54) und oberhalb der besagten Glasscheibe (V) bewegen;
    - Trocknungsmittel (59), die zu der besagten kartesischen Struktur (54) gehören und so konfiguriert sind, dass sie die besagte Tinte trocknen, nachdem sie auf die besagte Glasscheibe (V) aufgetragen wurde;
    - eine numerische Steuerung, die so konfiguriert ist, dass sie den Druckvorgang mit Hilfe einer speziellen Software steuert, die dazu bestimmt ist, die Informationen zu lesen, die sich auf die zu druckenden und auf digitalen Trägern aufgezeichneten besagten Wörter und/oder besagten Bilder beziehen, und die besagten Antriebsmittel und die besagten Sprühköpfe (53a) zu steuern,
    dadurch gekennzeichnet, dass die numerische Steuerung so konfiguriert ist, dass sie ein digitales Druckverfahren nach jeglichem der vorhergehenden Ansprüche implementiert.
  7. System (50) nach Patentanspruch 6, dadurch gekennzeichnet, dass die besagte kartesische Struktur (54) ein Paar von beabstandeten und parallelen Längswegen (55) und einen Querschlitten (56) umfasst, der an seinen Enden von den besagten Längswegen (55) aufgenommen wird und den besagten Druckkopf (52) aufnimmt, wobei die besagten Antriebsmittel der besagten kartesischen Struktur (54) zugeordnet sind.
  8. System (50) nach jeglichem der Patentansprüche 6 oder 7, dadurch gekennzeichnet, dass die besagten Antriebsmittel folgende Elemente umfassen:
    - Längsantriebsmittel, die so konfiguriert sind, dass sie den besagten Querschlitten (56) entlang der besagten Längswege (55) bewegen;
    - Querantriebsmittel, die so konfiguriert sind, dass sie den besagten Druckkopf (52) entlang des besagten Querschlittens (56) bewegen.
  9. System (50) nach jeglichem der Patentansprüche 6 bis 8, dadurch gekennzeichnet, dass die besagten optischen Mittel (53) Laseremitter sind.
EP19198398.0A 2018-09-20 2019-09-19 Verfahren zum digitalen drucken von bildern auf glas und system unter verwendung dieses druckverfahrens Active EP3626470B1 (de)

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IT201800008748 2018-09-20

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EP3626470B1 true EP3626470B1 (de) 2022-12-21

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Publication number Priority date Publication date Assignee Title
IT202200000593A1 (it) * 2022-01-17 2023-07-17 System Ceramics S P A Metodo per la stampa digitale di una lastra

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US20070103529A1 (en) * 2003-06-16 2007-05-10 Kornit Digital Ltd. Process and system for printing images on absorptive surfaces
DE602004027146D1 (de) 2003-08-25 2010-06-24 Dip Tech Ltd Tinte für keramische oberflächen
US9790388B2 (en) 2015-10-19 2017-10-17 Electronics For Imaging, Inc. Radiation-curable inkjet ink for application to glass, ceramic, or metal

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