EP3785489B1 - Procédé d'impression d'un revêtement en argent structuré à intensité maximale admissible améliorée - Google Patents

Procédé d'impression d'un revêtement en argent structuré à intensité maximale admissible améliorée Download PDF

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Publication number
EP3785489B1
EP3785489B1 EP19714224.3A EP19714224A EP3785489B1 EP 3785489 B1 EP3785489 B1 EP 3785489B1 EP 19714224 A EP19714224 A EP 19714224A EP 3785489 B1 EP3785489 B1 EP 3785489B1
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EP
European Patent Office
Prior art keywords
printing
busbar
grid
coating
matrix
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
EP19714224.3A
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German (de)
English (en)
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EP3785489A1 (fr
Inventor
Klaus WEISSBORN
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
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Publication of EP3785489A1 publication Critical patent/EP3785489A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/006—Patterns of chemical products used for a specific purpose, e.g. pesticides, perfumes, adhesive patterns; use of microencapsulated material; Printing on smoking articles
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/84—Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/12—Stencil printing; Silk-screen printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/26—Printing on other surfaces than ordinary paper
    • B41M1/34—Printing on other surfaces than ordinary paper on glass or ceramic surfaces
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/011—Heaters using laterally extending conductive material as connecting means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/013—Heaters using resistive films or coatings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/016—Heaters using particular connecting means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/017—Manufacturing methods or apparatus for heaters

Definitions

  • the invention relates to a method for producing a silver coating on a glass pane by screen printing.
  • glass panes are provided with busbars and heating conductors.
  • the busbars have solder contact surfaces for the power connection. If necessary, soldering contact surfaces for connecting antennas or alarm loops can be applied to glass panes.
  • Bus bars, heating elements and solder pads are applied to the glass pane in the form of electrically conductive layers, usually layers of silver.
  • a common method of applying the silver coating to the glass pane is screen printing with a silver paste ink.
  • the thickness or height of the print can be determined by the type of fabric or the thread thickness of the fabric and the layer thickness of the coating of the screen. With larger structures such as a busbar, this only applies to the edge of the busbar with regard to the coating of the screen; the effect is not effective in the middle area of the busbar.
  • busbars that are thicker than is possible with simple screen printing.
  • a greater thickness reduces the electrical resistance, which increases the current-carrying capacity of the busbars and reduces the temperature development when current is passed through.
  • the height or thickness of the busbar can also be advantageous in order to reduce the width of the busbar while maintaining the same current-carrying capacity (current-carrying capacity).
  • An increased thickness of the printed structure can also be advantageous for solder contact pads, since this increases the strength and robustness against aging of the solder joint with connection elements soldered thereto, particularly when lead-free connection elements are used.
  • Print thickness can also be adjusted by increasing the silver content in the silver paste. However, the maximum possible silver content in the printing paste is limited.
  • Vario silks are used for the printing screens, which use different thread diameters for a vertically limited area. This can also be used to generate different print thicknesses for vertically delimited areas. Here, however, one is limited both in terms of the different print thicknesses and the positioning of the areas with increased thickness.
  • EP 0465311 A1 relates to a heatable glass pane with electrical heating conductors, which has white busbars applied by screen printing, which run along two parallel edges and partially covered with a colored layer. To do this, the busbar can be coated with a series of black stripes leaving white areas exposed. The blackening process takes place by applying a new layer of black enamel.
  • US5264263A describes a heatable glass pane with electrical heating conductors, which has light-colored busbars applied by screen printing.
  • the light-colored busbars are partially covered with a dark enamel coating. eg in the form of a series of black stripes. By modifying the pattern of the enamel coating, it is possible to control the heating of the glass pane.
  • EP17480341 A1 describes a glass plate with printed conductive elements, the glass plate being provided with a dark ceramic print along the periphery on which busbars are applied by means of screen printing.
  • the busbars have recesses in which the ceramic print is exposed. A large number of small dots made from the material of the busbar can be printed in the recesses together with the busbar.
  • the object of the invention is to provide a method for forming busbars and/or solder pads on a glass pane by means of a silver coating, which allows an increased print thickness of the busbars and/or solder pads compared to the print thicknesses achievable with prior art screen printing methods.
  • a more uniform distribution of the printed printing paste over the width of the busbar or the soldering surfaces for the soldering contact is to be achieved, with a more uniform distribution of the printing paste being made possible in particular.
  • the method should be easy to carry out and in particular should not require any additional work steps.
  • it should be possible to apply an increased thickness only in certain selected areas of the busbar, for example in the area of the soldering surfaces.
  • the object according to the invention could be achieved by using a dot grid or line grid in the print areas of the print template for the busbar and/or the soldering areas.
  • the method according to the invention enables a higher print thickness by modifying the artwork in order to overcome the technical problems described above.
  • the print area in which the print template is at least partially designed with the dot pattern or line screen and the screen in this area is possibly coated more heavily, the print area is printed with a higher ink volume per area than in a print area without a partially coated dot pattern or line screen.
  • a wet print thickness can be achieved, for example, which is 5 to 100 ⁇ m thicker than the wet film thickness obtained with the same method but without using the dot screen or line screen. Accordingly, a higher layer thickness is also obtained after baking. Further, to the naked eye, the wet film is evenly distributed over the entire width of the bus bar or the solder pad. Several small elevations in the printed image can only be seen when enlarged with a magnifying glass or microscope.
  • the greater thickness causes a reduction in resistance, which increases the current carrying capacity of the busbars and reduces the temperature development when current is passed through, especially at critical points such as the soldering contact surfaces, e.g. the soldering contact surfaces of the busbar.
  • the greater thickness can also be used to reduce the width of the busbar while maintaining the current carrying capacity. In the case of the soldering contact surfaces, the greater thickness leads to increased strength of the soldered connection with connection elements soldered thereto, in particular when lead-free connection elements are used.
  • the invention relates to a method for producing a silver coating on a glass pane, the silver coating comprising at least one busbar and/or at least one soldering contact surface, the method comprising the steps of printing the silver coating onto the glass pane by screen printing with a print template having print and non-print areas and baking the printed silver coating, wherein the print area of the artwork for the bus bar and/or the print area of the Print template for the solder contact surface is at least partially provided with a grid of dots or lines.
  • the expressions “left/right” and “top/bottom” refer to the installation position of the glass pane in a vehicle.
  • the direction from “top” to “bottom” is then the longitudinal direction and the direction from “left” to “right” is the transverse direction.
  • the pane edge adjacent to the roof edge of the body in the installation position in a motor vehicle is referred to as “top”.
  • “Bottom”, on the other hand, describes the edge of the window pointing towards the edge of the motor in the case of a windshield and towards the opening of the tailgate in the case of a rear window.
  • “Left” and “right” in a windshield designate the edges of the window adjacent to the A-pillar of the body, while the “left” and “right” edges of a rear window border on the C-pillar and D-pillar of the vehicle body, respectively.
  • solder contact surface and “solder surface” are used synonymously in the following.
  • a solder contact can be soldered onto the glass at the solder contact surface, the solder contact representing a connection element.
  • the silver coating on the glass pane includes at least one bus bar and/or at least one solder pad.
  • the silver coating preferably comprises at least one busbar and optionally at least one soldering contact area for an alarm loop and/or at least one soldering contact area for an antenna.
  • the silver coating particularly preferably comprises at least one busbar and several heating conductors and optionally at least one soldering contact surface for an alarm loop and/or at least one soldering contact surface for an antenna.
  • Busbars are understood to mean electrically conductive strips that are positioned on the glass pane.
  • the busbar is also referred to as the current busbar.
  • Two busbars running in the longitudinal direction are usually applied in the area of the right and/or left side edge of the glass pane, which can also extend into the areas of the lower and upper side edge.
  • Two busbars running in the transverse direction in the area of the lower and/or upper side edge of the glass pane are also possible.
  • the silver coating therefore preferably comprises two busbars.
  • not one busbar is applied in the area of the side edge of the glass pane, but rather two or more busbars that are separate from one another. In this case, there are more than two busbars.
  • the silver coating comprises at least one busbar, usually at least two busbars
  • the silver coating usually also forms a plurality of heating conductors which are positioned between the busbars, usually transversely thereto.
  • Soldering contact areas for the busbar are generally also formed on the busbars with the coating. Connection elements can be fastened or soldered to these soldering contact surfaces, via which the supply lines for the power connection can be mounted. The current is highest in the area of the soldering contact surfaces of the busbar, but if the design is good, the thermal power is generated via the heating surface to be thawed (heating conductor) and the busbar and the soldering contact remain as cold as possible.
  • the coating can form at least one soldering contact area that is not intended for the busbar.
  • the solder pad can be, for example, a solder pad for an alarm loop or a solder pad for an antenna. Solder contacts or connection elements can be fastened or soldered to these solder contact surfaces, over which elements of the antenna or the alarm loop can be mounted.
  • An alarm loop typically includes an electrically conductive print or wire. When activated, the alarm loop receives a continuous quiescent current, which is interrupted if the pane breaks and triggers an alarm.
  • Such alarm loops are for example in the WO 2013/156184 A1 described.
  • the busbar can have a constant width over its length. Usually, however, the busbar has an irregular geometry, with the width being different at different points. In a preferred embodiment, the busbar has a maximum width in the range from 9 to 30 mm, preferably 9 to 16 mm.
  • the solder pads may have a rectangular, oval, or circular geometry.
  • the solder pads may have a largest dimension in the range of 4 to 24 mm. The largest dimension in a circle is the diameter and in a rectangle it is the diagonal.
  • the method according to the invention comprises the step of printing the silver coating onto the glass pane by screen printing with a master having printed and non-printed areas.
  • the screen printing is carried out in particular with a silver paste or conductive silver paste as the printing ink.
  • the artwork is a screen stretched in a frame and has non-print areas where the screen has a coating, also known as a stencil, and print areas where the screen is bare with no coating. Due to the stencil, the screen is ink-impermeable in all non-printing areas and ink-permeable in the printing areas.
  • the frame is usually a metal frame, for example steel frames or aluminum frames are common, with aluminum frames being preferred.
  • the screen is usually a fabric made of plastic threads or metal threads.
  • the threads are made, for example, of polyamide, polyester, carbon fiber or stainless steel, with fabrics made of polyester threads being particularly preferred.
  • the thread diameter of the fabric, in particular the polyester fabric can suitably be in the range of 30 to 150 microns, preferably 77 to 120 microns, and the mesh size of the fabric can be, for example, in the range of 43 to 180 threads per cm, preferably 77 to 150 threads per cm cm, lying.
  • the stencil On the non-printing areas of the artwork is the stencil, which is a barrier layer or coating that is on or in the screen and renders the artwork opaque to ink in the areas that are not intended to print.
  • the direct method (direct template) and the indirect method (indirect template) are customary for producing the template, with the direct method being preferred.
  • the direct stencil With the direct stencil, the fabric is coated with a light-sensitive layer, exposed and developed. The template is made directly on the fabric.
  • the indirect method the stencil is first created on a carrier and then transferred to the screen. The other steps to make the stencil are analogous.
  • the stencil is formed by a photomechanical process.
  • the screen or a support is coated with a light-sensitive composition, also referred to as an emulsion, or a light-sensitive film is applied to the screen or the support.
  • the desired pattern of opaque areas and transparent areas is then imaged onto the light-sensitive layer obtained, for example by means of a slide projection or a master copy or in the CTS method (" computer to screen "), and the layer is exposed to UV light.
  • the layer is hardened by the UV light and forms the stencil or the non-printing area.
  • the layer is not cured and can then be washed out, forming the printed areas of uncoated fabric.
  • the template formed is then transferred to the screen.
  • the print template created in this respect corresponds to the print template usually used. According to the invention, however, it is essential to the invention that the print area of the print template for the busbar and/or the print area of the print template for the soldering contact surface is at least partially provided with a dot grid or a line grid.
  • the dot grid or dot pattern represents an arrangement of several rows of dots arranged side by side.
  • the line grid or line pattern represents an arrangement of several parallel lines (parallel family of lines).
  • the embodiment with a dot grid is preferred, since the construction of a dot grid is simpler in execution and, as a result, the lower susceptibility to errors in the printing process has been found.
  • the dots of the grid of dots or the lines of the grid of lines are formed like the stencil from a barrier layer located on or in the screen by a photomechanical process. It goes without saying that the points of the point grid or the lines of the line grid are expediently formed together with the template, as described above. For this purpose, for imaging the desired pattern on the light-sensitive coating, e.g by means of slide projection, CTS processes or copy templates, to additionally record the corresponding pattern for the point grid or the line grid.
  • the points can have any geometry.
  • dots may be rectangular, square, elliptical, or circular, with circular dots being preferred.
  • the areas of the print pattern referred to as "dots" are the areas initially free of coating in the printing process, in which no silver print is applied, while the area surrounding these dots is provided with silver print according to the invention.
  • This printed area of the solder contact area is electrically conductively connected to the remaining area of the associated busbar. Usually this is done by a continuous silver print between these areas by printing with a common stencil. If the structured print area is designed in the form of lines instead of a dot pattern, this results in uncoated lines that are arranged alternately with the printed lines.
  • the lines applied by means of silver printing run essentially parallel to one another and parallel to the non-coating lines located in between.
  • the structured print area is preferably dimensioned in such a way that the structure (dots or lines) is too small for an exact print result.
  • the printing ink therefore runs into the initially uncoated areas. With the usual printing methods known in the prior art, such a bleeding of the printing ink would be undesirable and a criterion for rejecting the resulting product. Accordingly, it was surprising and unexpected for the person skilled in the art that a significant improvement in the printing result and in the printing height can be achieved by intentionally bringing about this.
  • the dimensions of the dots of the dot grid are below the resolving power, preferably just below the resolving power, of the artwork, i.e. the limit of printable dot fineness, which depends in particular on the thread diameter and thread spacing of the screen fabric.
  • the ink runs underneath the dots and the grid of dots is not visible in the printed coating.
  • the area below the dot pattern will appear solid to the human eye. First with a microscope or in cross-section, smaller mountain and valley areas can be identified (cf. 2 ).
  • the points of the point grid preferably have a diameter in the range from 0.10 mm to 0.3 mm, more preferably 0.16 to 0.2 mm. This applies to circular points. Unless the dots are non-circular, these ranges apply to the largest dimension of the dots.
  • the points of the point grid can have the same or different sizes, but are preferably of the same size.
  • the distance between the points of the point grid from one another is preferably in the range from 1D to 3D, preferably 1.75D to 2.25D, particularly preferably 1.9D to 2.1D, where D is the spot diameter or largest dimension of the spot.
  • D is the spot diameter or largest dimension of the spot.
  • this means a distance of 0.3 to 0.5 mm, preferably 0.35 to 0.45 mm and particularly preferably 0.38 to 0.42 mm.
  • the line grid is formed by lines or straight lines running parallel to one another.
  • the dimensions of the lines of the line grid are below the resolving power, preferably just below the resolving power, of the artwork, ie the limit of printable line fineness, which depends in particular on the thread diameter and thread spacing of the screen fabric.
  • the ink runs underneath the lines and the grid of lines is not visible in the printed coating.
  • the area below the line pattern will appear to be solid printed to the human eye. Smaller mountain and valley areas can only be identified with a microscope or in cross section.
  • the lines of the line screen preferably have a line width in the range from 0.1 mm to 0.4 mm.
  • the lines of the line screen can have the same or different widths, but are preferably of the same width.
  • the distance from adjacent lines of the line grid is, for example, in the range from 0.1 mm to 0.4 mm.
  • the distance refers to the distance between the central axis in the longitudinal direction of one line and the central axis of the adjacent line.
  • the distance between the lines of the line screen is preferably in the range from 0.7 B to 2.5 B, preferably 0.8 B to 2.2 B, more preferably 0.8 B to 1.2 B, where B is the line width of the line is.
  • the layer thickness of the stencil and the layer thickness of the points in the grid of points and the layer thickness of the lines in the grid of lines are understood here to mean the total thickness of the coating in the area of the stencil or in the area of the points in the grid of points or in the area of the lines in the grid of lines.
  • the layer thickness of the points of the point grid and the lines of the line grid can be, for example, in the range from 10 to 100 ⁇ m, preferably in the range from 10 to 80 ⁇ m and particularly preferably in the range from 10 to 30 ⁇ m.
  • the layer thickness of the stencil and the layer thickness of the points of the point grid or the lines of the line grid can be the same or different.
  • the layer thickness of the points of the point grid or the lines of the line grid is greater than the layer thickness of the stencil.
  • An increased layer thickness of the points of the point grid or the lines of the line grid can also increase the layer thickness of the busbar at the points of the point grid or line grid. This can be achieved by partially recoating the areas where the dot screen or line screen was applied. That is, after the coating of the non-printing areas and the areas of the dots of the dot screen or the areas of the lines of the line screen, the coating process is repeated, but only in the area of the dot screen or line screen.
  • partial after-coating is carried out in the area of the dot grid or line grid in order to achieve an increased layer thickness of the dots or lines compared to the layer thickness of the to get the template.
  • the layer thickness of the dots or lines can be, for example, in the range of 1.5 times to 2.5 times the layer thickness of the stencil.
  • the print area surface of the print template for the busbar can be partially or completely provided with the dot grid or line grid, with the print area surface preferably being partially provided with the dot grid or line grid.
  • 1 to 100%, preferably 5 to 100%, particularly preferably 15 to 75% of the print area of the print template for the busbar can be provided with the dot screen or line screen.
  • busbar has wider and narrower sections, it is usually sufficient if the busbar is printed thicker in the wider sections, especially in the sections with maximum width, so that only the print areas of the print template intended for this purpose are provided with the dot grid or line grid can become.
  • the print area of the print template for the busbar is partially provided with the dot grid or the line grid and the print area provided with the dot grid or line grid is arranged at the locations of the solder contact surface(s) of the busbar. As explained above, the highest current occurs at these points, so that a thicker busbar at these points can contribute effectively to better current distribution.
  • the print area surface of the print template for the soldering contact surface can be partially or completely provided with the point grid or line grid, with the print area surface preferably being partially provided with the point grid or line grid.
  • 1 to 100%, preferably 5 to 100%, preferably 15 to 75% of the printing area area of the artwork for the busbar may be provided with the dot screen or the line screen.
  • solder pad By using the dot grid or the line grid for the print areas of the artwork for the solder pad, a more robust solder pad can be obtained.
  • This has the advantage that the functions of the soldering contact area, such as the stability of adhesion to a connection element, can also be achieved with a smaller layer thickness.
  • a higher thickness of the silver is achieved compared to the otherwise same screen printing, but without a dot grid or line grid, which improves the strength of the solder joint with terminals soldered thereto, especially with lead-free terminals.
  • Providing the print area surface of the print template for the soldering contact surface with the dot grid or line grid is particularly suitable for soldering contact surfaces for an antenna, soldering contact surfaces for an alarm loop and for soldering contact surfaces of busbars located in the area of the lower or upper side edge of the glass pane.
  • Providing the print area surface of the print template for the solder contact surface with the dot grid or line grid is particularly suitable for Solder contact pads that are not positioned in the area of the right or left side edge of the glass pane.
  • the print template that has been created is used with at least one dot grid or one line grid in a partial area of the print area, as described above. Otherwise the screen printing takes place as known in the state of the art.
  • the artwork is positioned on the glass pane.
  • the ink is applied to the top of the artwork and spread evenly.
  • the ink is then squeegeed through the mesh openings of the screen in the print areas onto the glass pane with a squeegee.
  • the glass pane is only in contact with the screen in the immediate printing zone due to the squeegee. With a greater distance, the so-called jump, the glass pane detaches more easily from the screen after the printing phase.
  • a silver paste or conductive silver paste is used as the printing ink.
  • Common commercial products can be used.
  • Silver pastes or conductive silver pastes usually contain large amounts of silver or silver alloy, e.g. 30 to 88% by weight, as powder or flakes, organic binders, organic solvents and optionally other additives.
  • a thicker and more uniform layer thickness of the busbar is achieved in those places where the corresponding print area of the artwork has a grid of dots or a grid of lines, compared to screen printing, which does not use a grid of dots or a grid of lines, but which is otherwise the same.
  • the height of the printed busbar before burning-in is, for example, 25 to 100 ⁇ m, preferably 30 to 80 ⁇ m, at the points that are printed with the print area of the artwork provided with a dot grid or line grid.
  • the height refers to the thickness before baking, i.e. the wet film thickness.
  • the screen printing can be followed by a drying process, which can optionally also take place at an elevated temperature.
  • the method according to the invention further comprises the step of baking the printed silver coating.
  • Baking temperature and duration depend on the type of silver paste used.
  • the burn-in process can, for example, at a Temperature in the range of 400 to 700 ° C done.
  • the duration of the heat treatment can be, for example, 5 s to 200 s.
  • the glass pane can be made of inorganic glass, in particular silicate glass. Examples are soda lime glass, borosilicate glass, aluminosilicate glass or quartz glass.
  • the glass pane is preferably single-pane safety glass or laminated glass.
  • the glass pane can have a coating in one or more edge areas, preferably all edge areas, preferably a coating with a ceramic paint, such as a black ceramic paint.
  • a ceramic paint such as a black ceramic paint.
  • Those skilled in the art are familiar with such opaque coatings in the edge region of vehicle glazing under the term black print.
  • Coating the side edges with ceramic paint is used, for example, to hide adhesives used to mount a glass pane on a vehicle.
  • the busbars of the silver coating are preferably printed on this coating, especially on the ceramic paint coating.
  • the glass pane provided with the silver coating is preferably a heatable glass pane, particularly preferably a heatable vehicle pane, in particular a rear window.
  • a sheet of glass with a silver coating comprising at least one bus bar and/or at least one solder pad obtainable according to the method of the invention described above.
  • the product features disclosed in the description of the process apply in their entirety to the glass pane and should not be repeated here. Conversely, the features disclosed in the description of the product also apply to the method according to the invention.
  • the glass pane comprises at least one busbar and/or the soldering contact surface with a printed silver coating, which is at least partially provided with a dot grid or a line grid, the layer thickness of the printed silver coating in the area of the points of the point grid or the lines of the line grid being less than the layer thickness in the print area of the dot grid or line grid surrounding the dots or lines.
  • the dimensions of the dots in the grid of dots and the lines in the grid of lines are below the resolution of human beings eye, but can easily be detected on the product by means of a microscopic examination.
  • the structuring of the silver print of the glass pane comes about through the use of the method according to the invention.
  • a particular advantage of the glass pane, as described for the method according to the invention is the greater current-carrying capacity in the area of the dot grid.
  • the layer thickness of the printed silver coating in the area of the dots of the point grid or the lines of the line grid is in the range of 10 to 30 ⁇ m and the layer thickness of the printed silver coating in the area of the point grid or line grid surrounding the points or lines is in the range of 30 to 80 ⁇ m.
  • the layer thickness in the area of the dots or lines is chosen to be smaller than the layer thickness in the print area surrounding the dots or lines. This ratio has proven to be particularly advantageous with regard to optimizing the current-carrying capacity while at the same time using as little material as possible.
  • the mentioned layer thicknesses refer to the wet layer thickness.

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  • General Chemical & Material Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Printing Methods (AREA)
  • Manufacturing Of Printed Wiring (AREA)

Claims (13)

  1. Procédé de production d'une couche d'argent sur une vitre (16), dans lequel la couche d'argent comprend au moins une barre omnibus (1) et/ou au moins une surface de contact de soudure, dans lequel le procédé comprend les étapes d'impression de la couche d'argent sur la vitre par sérigraphie avec un motif d'impression ayant des zones d'impression et de non-impression et de cuisson de la couche d'argent imprimée, caractérisé par le fait que la zone d'impression (12) du motif d'impression pour la une barre omnibus et/ou la zone d'impression du motif d'impression pour la surface de contact de soudure est pourvue au moins partiellement d'une matrice de points (14) ou d'une matrice de lignes (20), dans laquelle les dimensions des points de la matrice de points sont inférieures à la résolution du motif d'impression ou les dimensions des lignes de la matrice de lignes sont inférieures à la résolution du motif d'impression.
  2. Procédé selon la revendication 1, dans lequel la couche d'argent comprend au moins une barre omnibus (1) et une pluralité de conducteurs chauffants (17) et, éventuellement, au moins une surface de contact de soudure pour une boucle d'alarme et/ou une antenne.
  3. Procédé selon la revendication 1 ou 2, dans laquelle la barre omnibus (1) a une largeur maximale comprise entre 9 et 30 mm.
  4. Procédé selon l'une quelconque des revendications 1 à 3, dans lequel la hauteur de la barre omnibus imprimée (1) et/ou de la surface de contact de soudure imprimée avant cuisson aux endroits imprimés avec la zone d'impression du motif d'impression fourni avec la matrice de points ou la matrice de lignes est comprise entre 25 et 100 µm, de préférence entre 30 et 80 µm.
  5. Procédé selon l'une des revendications 1 à 4, dans laquelle les points (6) de la matrice de points (14) ont un diamètre compris entre 0,14 mm et 0,22 mm, de préférence entre 0,16 et 0,2 mm, et/ou dans laquelle les lignes (21) de la matrice de lignes (20) ont une largeur comprise entre 0,1 mm et 0,4 mm.
  6. Procédé selon l'une quelconque des revendications 1 à 5, dans lequel la distance entre les points adjacents (6) de la matrice de points (14) est comprise entre 1,5 D et 2,5 D, de préférence entre 1,75 D et 2,25 D, de préférence encore entre 1,9 D et 2,1 D, où D est le diamètre du point.
  7. Procédé selon l'une quelconque des revendications 1 à 6, dans lequel l'épaisseur de la couche des points (6) de la matrice de points (14) ou des lignes (21) de la matrice de lignes (20) est comprise entre 10 et 80 µm, de préférence entre 10 et 30 µm.
  8. Procédé selon l'une quelconque des revendications 1 à 7, dans lequel 1 à 100 %, de préférence 5 à 100 %, plus préférentiellement 15 à 75 %, de la zone d'impression du motif d'impression pour la barre omnibus est fournie par la matrice de points (14) ou la matrice de lignes (20) et/ou 1 à 100 %, de préférence 5 à 100 %, plus préférentiellement 15 à 75 %, de la zone d'impression du motif d'impression pour la surface de contact de soudure est fournie par la matrice de points (14) ou la matrice de lignes (20).
  9. Procédé selon l'une des revendications 1 à 8, dans lequel la zone d'impression du motif d'impression pour la barre omnibus est partiellement pourvue de la matrice de points (14) ou de la matrice de lignes (20) et la zone d'impression pourvue de la matrice de points (14) ou de la matrice de lignes (20) est disposée à proximité des surfaces de contact de soudure de la barre omnibus (1).
  10. Procédé selon l'une quelconque des revendications 1 à 9, dans lequel la vitre (16) est un verre de sécurité simple ou un verre feuilleté.
  11. Procédé selon l'une quelconque des revendications 1 à 10, dans lequel la vitre (16) est recouverte d'un revêtement dans une ou plusieurs zones de bord, de préférence d'une peinture céramique (18), et la barre omnibus est imprimée sur le revêtement.
  12. Procédé selon l'une quelconque des revendications 1 à 11, dans lequel la vitre (16) pourvue du revêtement argenté est une vitre chauffante, de préférence une vitre chauffante pour véhicule.
  13. Procédé selon l'une quelconque des revendications 1 à 12, dans lequel, pendant la production du motif d'impression, après avoir enduit l'écran dans les zone non imprimantes et dans la région de la matrice de points ou de la matrice de lignes, on procède à un enduction partielle ultérieure dans la région de la matrice de points ou de la matrice de lignes afin d'obtenir une épaisseur de couche accrue des points ou des lignes.
EP19714224.3A 2018-04-25 2019-04-04 Procédé d'impression d'un revêtement en argent structuré à intensité maximale admissible améliorée Active EP3785489B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18169255 2018-04-25
PCT/EP2019/058490 WO2019206592A1 (fr) 2018-04-25 2019-04-04 Procédé d'impression d'un revêtement structuré en argent présentant une intensité maximale admissible de courant améliorée

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EP3785489A1 EP3785489A1 (fr) 2021-03-03
EP3785489B1 true EP3785489B1 (fr) 2023-08-02

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US (1) US20210053376A1 (fr)
EP (1) EP3785489B1 (fr)
CN (1) CN110637503B (fr)
MA (1) MA52345A (fr)
WO (1) WO2019206592A1 (fr)

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CN112515660B (zh) * 2020-11-30 2022-04-19 居天科技(深圳)有限公司 激光雷达人体建模方法
EP4043255A1 (fr) * 2021-02-11 2022-08-17 Inalfa Roof Systems Group B.V. Panneau de toit transparent comportant une unité centrale isolée
EP4308378A1 (fr) 2021-03-17 2024-01-24 Saint-Gobain Glass France Vitre feuilletée pour un toit de véhicule ayant un capteur de sécurité pour une surveillance d'un intérieur
FR3124763B1 (fr) 2021-06-30 2023-06-30 Saint Gobain Ecran de sérigraphie pour l’obtention de vitrages munis de motifs électroconducteurs
FR3145161A1 (fr) * 2023-01-20 2024-07-26 Saint-Gobain Glass France Procédé d’obtention de vitrages munis de motifs électroconducteurs
WO2024179875A1 (fr) 2023-02-28 2024-09-06 Saint-Gobain Glass France Unité de vitrage comprenant un composant électronique

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Publication number Priority date Publication date Assignee Title
US4388522A (en) * 1980-12-08 1983-06-14 Ford Motor Company Electrically heated backlite structure
DE3231382C2 (de) * 1982-08-24 1986-11-20 Flachglas AG, 8510 Fürth Verfahren zum Bedrucken einer Glasscheibe mit Heizleitern und demgegenüber schichtdickeren Sammelschienen sowie für die Durchführung des Verfahrens geeignete Siebdruckschablone
US5264263A (en) * 1990-07-02 1993-11-23 Saint-Gobain Vitrage International Shaped glazing provided with a current network
FR2663885B1 (fr) 1990-07-02 1993-05-28 Saint Gobain Vitrage Int Vitrage en forme muni d'un reseau chauffant.
DE4111625A1 (de) 1991-04-10 1991-09-12 Torgau Flachglas Loetbereich von sammelschienen heizbarer autoscheiben mit maskendruck
US5390595A (en) * 1993-05-05 1995-02-21 Cutcher; Thomas V. Printing screen with plugs and method for printing a variable thickness pattern
US20060035051A1 (en) * 2000-06-23 2006-02-16 Jean-Benoit Lhoest Glazing
EP1748034A4 (fr) * 2004-04-28 2008-05-28 Asahi Glass Co Ltd Vitrage avec impression conductrice et procédé de fabrication
DE102007050286A1 (de) * 2007-10-18 2009-04-23 Saint-Gobain Sekurit Deutschland Gmbh & Co. Kg Transparente Scheibe mit einer elektrisch heizbaren Beschichtung
EP2839446B1 (fr) 2012-04-18 2016-11-30 Saint-Gobain Glass France Vitrage isolant doté d'une boucle d'alerte
FR3054771B1 (fr) * 2016-07-27 2020-11-06 Saint Gobain Vitrage muni d'un dispositif conducteur electrique avec zones de soudure ameliorees

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Publication number Publication date
MA52345A (fr) 2021-03-03
EP3785489A1 (fr) 2021-03-03
WO2019206592A1 (fr) 2019-10-31
US20210053376A1 (en) 2021-02-25
CN110637503B (zh) 2022-10-18
CN110637503A (zh) 2019-12-31

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