EP3867073B1 - Verfahren und maschine zum digitalen drucken von glas - Google Patents

Verfahren und maschine zum digitalen drucken von glas Download PDF

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Publication number
EP3867073B1
EP3867073B1 EP19787091.8A EP19787091A EP3867073B1 EP 3867073 B1 EP3867073 B1 EP 3867073B1 EP 19787091 A EP19787091 A EP 19787091A EP 3867073 B1 EP3867073 B1 EP 3867073B1
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EP
European Patent Office
Prior art keywords
mobile plane
ink
glass sheet
heating
advancement
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.)
Active
Application number
EP19787091.8A
Other languages
English (en)
French (fr)
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EP3867073A1 (de
Inventor
Fabio LICOPODIO
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.)
System Ceramics SpA
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System Ceramics SpA
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
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Publication of EP3867073A1 publication Critical patent/EP3867073A1/de
Application granted granted Critical
Publication of EP3867073B1 publication Critical patent/EP3867073B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • 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
    • B41J11/00214—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation using UV radiation
    • 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
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0011—Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating
    • 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
    • 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.
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0081—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/009—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using thermal means, e.g. infrared radiation, heat

Definitions

  • the present invention relates to a method and a machine for the digital printing of flat glass sheets.
  • the invention can be usefully, but not exclusively, applied in the sector of manufacturing windows for motor vehicles.
  • the invention relates to the decoration of glass sheets with vitrifiable inks in the step prior to hardening.
  • Such inks stand out due to the formation of a vitreous layer, with similar technical features to the surface to be decorated.
  • the decorated glass can remain flat or be subjected to a forming step in a mould for obtaining a three-dimensional shape.
  • the forming step and the vitrification step of the ink applied are always simultaneous as both take place during the hardening of the glass.
  • the glass sheets are preferably decorated with completely covering bands, which sometimes affect the entire surface of the glass, and/or by affixing logos and/or various writing.
  • Such dark and matt bands as well as having aesthetic purposes, also have a technical function which depends on the field of application. For example, in the automotive sector, the bands must shield the solar radiation to protect the glue of the window onto the chassis of the motor vehicle from solar radiation.
  • glass sheets are decorative glass items or glass sheets for hobs or glass sheets in general where digital printing needs to be performed with a certain decoration or drawing.
  • Screen printing is characterised by low installation costs and good continuous production speed.
  • the starting of the screen printing line is time consuming, hence implying lost efficiency in small productions, and requires specialised personnel with long training times.
  • the use of screen printing sheets does not allow production flexibility as, to change the decoration, the screen printing sheets need to be replaced.
  • Ink jet printing offers the advantage of high production flexibility, as it enables the decoration applied to the sheets to be changed as preferred.
  • the current printing process is rather slow. The reason is connected with the non-absorbent nature of the medium to be printed and the chemical/physical characteristics of the inks used in digital printing. For example, the density and viscosity of the inks for digital printing are substantially lower with respect to screen printing inks.
  • To obtain prints with sufficient definition and sufficient opaqueness it is necessary to perform various printing steps, to deposit a sufficient thickness of ink on the sheets.
  • the decoration is often unstable and tends to be deformed after application, compromising the definition and overall quality of the final result.
  • WO2016042496 represents the closest prior art, disclosing an in-line decoration machine, which adopts application of several ink layers in sequence while the glass sheets advance on a transport plane, without arresting.
  • the other prior art documents disclose methods and machines of a plotter type, adopting heating sources which locally heats the ink or the glass sheets before application of the layer of ink.
  • the heating sources partly improve the density of the ink layer, so that the stability of the ink layer is also partly improved.
  • the object of the present invention is to offer a method and a machine for the digital printing of glass sheets which enables obviating the limits of the current technologies.
  • the method according to the present invention envisages, prior to the application of ink, a heating step of the glass sheets.
  • the heating step takes place while the sheet advances on a transport surface, which will be better described below.
  • the heating is performed through a static source. This allows a source of power and considerable dimensions to be provided.
  • the heating step is extremely useful and advantageous, as it allows the subsequent application of a layer of ink with a consistent thickness, a thickness that, with current technologies, can only be applied through the subsequent superposition of various layers of ink.
  • the heating of the sheet that precedes the application of the layer of ink allows a layer of ink to be applied with a significantly higher thickness with respect to what is allowed by current technologies.
  • the heating of the sheet determines quick consolidation at least of the lower area of the layer of ink, i.e. of the area in contact with the surface of the sheet.
  • Such lower area quickly takes on a greater density and a greater consistency, and allows the layer of ink to be kept stable which, unlike what happens in current technologies, does not expand and does not spread outside the outlines envisaged for the decoration.
  • the structure and graphics of the decoration applied remain faithful to the envisaged pattern, also for a high thickness of the layer of ink applied.
  • the heating of the glass sheets, prior to the application of the ink is performed by exposing the sheets to the radiation of one or more IR lamps.
  • Such lamps are positioned so as to irradiate the sheets.
  • the lamps may be positioned above the sheets in a static position.
  • other solutions for heating the sheets are possible, e.g. using hot air or heaters of another kind, generally known to a person skilled in the art.
  • the heating brings the sheets to a temperature comprised between 50 and 80 degrees centigrade.
  • the heating of the sheets is performed while the latter are transported in advancement on a mobile plane (2).
  • a mobile plane (2) transports the sheets to a printhead (4), e.g. an inkjet one.
  • the application of the layer of ink takes place while the sheets are transported in advancement on the mobile plane (2).
  • the heating of the sheets produces quick consolidation of the ink as soon as it has been applied, which can therefore be applied in a single step, also for consistent thicknesses.
  • the sheets are taken to the printhead (4) continuously, without needing to stop.
  • the layer of ink is subjected to a drying step.
  • drying step has the aim of further consolidating the layer of ink applied on the glass sheets.
  • the drying of the ink can be performed, for example, by exposing the glass sheets to the radiation of one or more UV lamps and/or one or more IR lamps.
  • a heating means of another kind, known in the sector, can be used.
  • the drying of the ink can be performed, in combination or alternatively to the lamps mentioned above, by exposing the glass sheet to an air current directed downwards.
  • an air current possibly heated, allows the drying of the ink to be made quicker.
  • the downwards direction of the air current prevents the layer of ink being transversally strained. The drying of the layer of ink is performed while the sheet is transported in advancement on the mobile plane (2).
  • the mobile plane (2) comprises a plurality of rollers (20) each of which has a cylindrical outer surface (21), provided to allow the support of a sheet to be transported.
  • the rollers (20) are activated in rotation by a motor (23), connected by a transmission element (24).
  • the transmission element (24) is placed in contact with the outer surface (21) of the rollers (20), or in contact with a portion of the rollers (20) which has the same diameter as the outer surface (21).
  • the transmission element (24) is placed in contact with the outer surface (21) of the rollers (20) so as to transfer the motion to the outer surface (21) itself.
  • the contact between the transmission element (24) and the outer surface (21) takes place on a portion of the outer surface (21) tangential to the transport plane (a).
  • the outer surfaces (21) of the various rollers (20) necessarily have a peripheral speed equal to the speed of the transmission element (24), and therefore have the same peripheral speed as one another.
  • Such equal peripheral speed condition between the outer surfaces (21) also occurs in the event in which the outer surfaces (21) do not have exactly the same diameter, or even have a different diameter.
  • the transmission element (24) comprises a belt.
  • the mobile plane (2) comprises a plurality of tensioning rollers (25), interposed between the rollers (20) and placed in contact with the transmission element (24), on the opposite side with respect to the rollers (20).
  • the tensioning rollers (25) are arranged so as to stretch the transmission element (24) in contact with the rollers (20) so as to press the transmission element (24) in contact with the outer surfaces (21). Thanks to the presence of the tensioning rollers (25) the winding angle of the transmission element (24) around the outer surfaces (21) increases.
  • the machine for the actuation of the method comprises, proceeding from an inlet zone, a heating device (3), provided to heat the glass sheets on the mobile plane (2).
  • the heating device (3) comprises one or more IR lamps, facing towards the mobile plane (2) so as to irradiate the mobile plane (2) itself.
  • the lamps are connected above the mobile plane (2).
  • an inkjet printhead (4) is located downstream of the heating device (3). Also the printhead (4) is located above the mobile plane (2).
  • An example of a particularly suitable printhead for the purpose is described in patent applications 202017000147594 of 20/12/2017 and 202018000001943 of 20/02/2018 , filed in the name of the same Applicant.
  • the printhead indicated above comprises two or more printheads, each of which comprises two or more rows of nozzles that are parallel to a first alignment direction.
  • the rows of nozzles are staggered with respect to a second direction perpendicular to the first alignment direction.
  • the first alignment direction is arranged perpendicular with respect to the transport direction (X) of the sheets to be decorated.
  • the alignment direction can be inclined diagonally with respect to a transport direction (X).
  • the projection of all the nozzles belonging to the various heads on a straight line perpendicular to the transport direction (X) defines a print front.
  • the printhead allows a print head to be obtained with greater definition, i.e. with a higher number of nozzles per unit of length, with respect to a printhead of the known type, with printheads oriented perpendicularly to the transport direction (X). Furthermore, it is possible to distribute the nozzles uniformly, also in the transition zones between one head and another, without needing to resort to a staggered arrangement of the heads.
  • the machine Downstream of the printhead (4), the machine comprises the drying device (5), provided to dry the layer of ink applied by the printhead (4) onto the glass sheets.
  • the drying device (5) comprises one or more UV or IR lamps, facing towards the mobile plane (2) so as to irradiate the mobile plane (2) itself.
  • the lamps are preferably arranged above the mobile plane (2).
  • the drying device (5) comprises a fan means (52), provided to send towards the mobile plane (2) an air current directed downwards.
  • the fan means (52) may be provided with a heater for heating the air current and speeding up the drying of the ink.
  • the heating device (3), the printhead (4) and the drying device (5) operate on the mobile plane (2), while the sheets advance on the mobile plane (2).
  • the production cycle is therefore continuous, i.e. the sheets can advance continuously along the mobile plane (2) without needing to stop.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Ink Jet (AREA)
  • Glass Compositions (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Claims (11)

  1. Verfahren zum digitalen Drucken einer Glasscheibe, umfassend die folgenden Schritte:
    Transportieren der Glasscheibe im Vorschub auf einer beweglichen Ebene (2);
    während des Vorschubs, Erwärmen der Glasscheibe auf eine vorbestimmte Temperatur, während die Glasscheibe im Vorschub auf der beweglichen Ebene (2) transportiert wird;
    nach dem Erwärmungsschritt und während des Vorschubs, Auftragen einer Tintenschicht auf die Glasscheibe gemäß einem vorbestimmten Muster, während die Glasscheibe im Vorschub auf der beweglichen Ebene (2) transportiert wird;
    während des Vorschubs, nach dem Schritt zum Auftragen einer Tintenschicht, Trocknen der Tintenschicht, während die Glasscheibe im Vorschub auf der beweglichen Ebene (2) transportiert wird.
  2. Verfahren nach Anspruch 1, wobei der Schritt zum Erwärmen der Glasscheibe durchgeführt wird, indem die Scheibe der Strahlung einer oder mehrerer IR-Lampen ausgesetzt wird.
  3. Verfahren nach einem der vorhergehenden Ansprüche, wobei der Schritt zum Erwärmen der Glasscheibe durchgeführt wird, um die Scheibe auf eine Temperatur zwischen 50 und 80 Grad Celsius, vorzugsweise 65 Grad Celsius, zu bringen.
  4. Verfahren nach einem der vorhergehenden Ansprüche, wobei die Tintenschicht durch einen Tintenstrahldruckkopf aufgetragen wird.
  5. Verfahren nach einem der vorhergehenden Ansprüche, wobei der Schritt zum Trocknen der Tinte durchgeführt wird, indem die Glasscheibe der Strahlung einer oder mehrerer UV-Lampen und/oder einer oder mehrerer IR-Lampen ausgesetzt wird.
  6. Verfahren nach einem der vorhergehenden Ansprüche, wobei der Schritt zum Trocknen der Tinte durchgeführt wird, indem die Glasscheibe einem nach unten gerichteten Luftstrom ausgesetzt wird.
  7. Maschine zum digitalen Drucken von Glasscheiben, umfassend:
    eine bewegliche Ebene (2) zum Transportieren der Glasscheiben im Vorschub entlang einer Transportrichtung (X);
    eine Erwärmungsvorrichtung (3), die zum Erwärmen der Glasscheiben auf der beweglichen Ebene (2) vorgesehen ist;
    einen Tintenstrahldruckkopf (4), der in Bezug auf die Transportrichtung (X) hinter der Erwärmungsvorrichtung (3) angeordnet und über der beweglichen Ebene (2) platziert ist;
    eine Trocknungsvorrichtung (5), die bereitgestellt ist, um eine durch den Druckkopf (4) auf die Glasscheiben aufgetragene und in Bezug auf die Transportrichtung (X) hinter dem Druckkopf (4) angeordnete Tintenschicht zu trocknen;
    wobei die Erwärmungsvorrichtung (3), der Druckkopf (4) und die Trocknungsvorrichtung (5) auf der beweglichen Ebene (2) arbeiten, während die Scheiben auf der beweglichen Ebene (2) vorgeschoben werden.
  8. Maschine nach Anspruch 7, wobei die Erwärmungsvorrichtung (3) eine oder mehrere IR-Lampen (31) umfasst, die der beweglichen Ebene (2) zugewandt sind, um die bewegliche Ebene (2) selbst zu bestrahlen.
  9. Maschine nach Anspruch 7, wobei die bewegliche Ebene (2) umfasst: eine Vielzahl von Rollen (20), von denen eine jede eine zylindrische Außenfläche (21) aufweist, die zum Tragen eines zu transportierenden Gegenstands vorgesehen ist; einen Motor (23); ein Übertragungselement (24), das den Motor (23) kinematisch mit den Rollen (20) verbindet; wobei das Übertragungselement (24) in Kontakt mit der Außenfläche (21) der Rollen (20) oder in Kontakt mit einem Abschnitt der Rollen (20), der den gleichen Durchmesser wie die Außenfläche (21) aufweist, angeordnet ist.
  10. Maschine nach Anspruch 7, wobei die Trocknungsvorrichtung (5) eine oder mehrere UV- oder IR-Lampen umfasst, die der beweglichen Ebene (2) zugewandt sind, um die bewegliche Ebene (2) selbst zu bestrahlen.
  11. Maschine nach Anspruch 7, wobei die Trocknungsvorrichtung (5) Gebläsemittel (52) umfasst, die dazu vorgesehen sind, einen nach unten gerichteten Luftstrom in Richtung der beweglichen Ebene (2) zu senden.
EP19787091.8A 2018-10-18 2019-10-01 Verfahren und maschine zum digitalen drucken von glas Active EP3867073B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102018000009570A IT201800009570A1 (it) 2018-10-18 2018-10-18 Metodo e macchina per la stampa digitale di vetro
PCT/IB2019/058341 WO2020079511A1 (en) 2018-10-18 2019-10-01 A method and machine for the digital printing of glass

Publications (2)

Publication Number Publication Date
EP3867073A1 EP3867073A1 (de) 2021-08-25
EP3867073B1 true EP3867073B1 (de) 2023-11-29

Family

ID=65031706

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19787091.8A Active EP3867073B1 (de) 2018-10-18 2019-10-01 Verfahren und maschine zum digitalen drucken von glas

Country Status (5)

Country Link
EP (1) EP3867073B1 (de)
IT (1) IT201800009570A1 (de)
PL (1) PL3867073T3 (de)
PT (1) PT3867073T (de)
WO (1) WO2020079511A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113771482A (zh) * 2021-08-26 2021-12-10 中国建材国际工程集团有限公司 一种光伏背板玻璃印刷装置及印刷方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7803221B2 (en) * 2003-08-25 2010-09-28 DIP Tech LTd.. Ink for ceramic surfaces
KR20100026677A (ko) * 2008-09-01 2010-03-10 세메스 주식회사 벨트 구동 장치 및 이를 포함하는 기판 처리 장치
JP5849854B2 (ja) * 2012-05-10 2016-02-03 コニカミノルタ株式会社 ガラス用インクジェットインクセット及びそれを用いたインクジェット記録方法
WO2016042496A1 (en) * 2014-09-19 2016-03-24 System S.P.A. Decorating apparatus
CN106393998A (zh) * 2016-05-26 2017-02-15 汤振华 一种玻璃喷绘设备

Also Published As

Publication number Publication date
PL3867073T3 (pl) 2024-05-13
PT3867073T (pt) 2024-01-22
IT201800009570A1 (it) 2020-04-18
WO2020079511A1 (en) 2020-04-23
EP3867073A1 (de) 2021-08-25

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