Classifications

• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
  • C03C17/06—Surface treatment of glass, not in the form of fibres or filaments, by coating with metals
  • C03C17/10—Surface treatment of glass, not in the form of fibres or filaments, by coating with metals by deposition from the liquid phase
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
  • B41C1/00—Forme preparation
  • B41C1/14—Forme preparation for stencil-printing or silk-screen printing
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
  • C03C17/001—General methods for coating; Devices therefor
  • C03C17/002—General methods for coating; Devices therefor for flat glass, e.g. float glass
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
  • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
  • H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
  • H01L21/67005—Apparatus not specifically provided for elsewhere
  • H01L21/67011—Apparatus for manufacture or treatment
  • H01L21/6715—Apparatus for applying a liquid, a resin, an ink or the like
• • 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
• • 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
  • H05B3/86—Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields the heating conductors being embedded in the transparent or reflecting material
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K3/00—Apparatus or processes for manufacturing printed circuits
  • H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
  • H05K3/12—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns
  • H05K3/1216—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns by screen printing or stencil printing
  • H05K3/1225—Screens or stencils; Holders therefor
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
  • B41N1/00—Printing plates or foils; Materials therefor
  • B41N1/24—Stencils; Stencil materials; Carriers therefor
  • B41N1/247—Meshes, gauzes, woven or similar screen materials; Preparation thereof, e.g. by plasma treatment
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2217/00—Coatings on glass
  • C03C2217/20—Materials for coating a single layer on glass
  • C03C2217/25—Metals
  • C03C2217/251—Al, Cu, Mg or noble metals
  • C03C2217/254—Noble metals
  • C03C2217/256—Ag
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2218/00—Methods for coating glass
  • C03C2218/10—Deposition methods
  • C03C2218/11—Deposition methods from solutions or suspensions
  • C03C2218/119—Deposition methods from solutions or suspensions by printing
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2218/00—Methods for coating glass
  • C03C2218/30—Aspects of methods for coating glass not covered above
  • C03C2218/34—Masking
• • 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
  • H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
  • H05B2203/007—Heaters using a particular layout for the resistive material or resistive elements using multiple electrically connected resistive elements or resistive zones
• • 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
  • H05B2203/014—Heaters using resistive wires or cables not provided for in H05B3/54
• • 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
  • H05B2203/037—Heaters with zones of different power density
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K1/00—Printed circuits
  • H05K1/02—Details
  • H05K1/03—Use of materials for the substrate
  • H05K1/0306—Inorganic insulating substrates, e.g. ceramic, glass
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
  • H05K2203/30—Details of processes not otherwise provided for in H05K2203/01 - H05K2203/17
  • H05K2203/304—Protecting a component during manufacturing

Definitions

• the present invention relates to the field of silk screen printing of electroconductive patterns, in particular based on silver, on glazings.
• Electroconductive patterns such as heating wires, antennas or other sensors present in the automotive glazings are made from a conductive paste, such as for example a silver paste screen printed on a sheet of glass, and are connected to a power supply system via connectors welded to the conductive paste.
• the connectors are welded in certain well defined areas of the glazing and the alloys currently used to make these welds are lead-free alloys, based on silver, tin and copper.
• Glazed windows equipped with such electrically conductive devices must, in order to be put on the market and accepted by car manufacturers, pass increasingly stringent resistance tests.
• the alloys used for the welds must in particular meet the criteria imposed by the TST test (or "temperature cycling test").
• the objective of this test is to determine if the glazing once equipped with electrical functions can withstand successive and rapid rise and fall in temperature, without being weakened. These tests were developed to accelerate the effects that would be caused by the differences in thermal behavior of the various components of the system.
• the new test imposes temperature variations between -40 ° C and + 105 ° C, therefore over a larger range of variation than the previous tests which were limited to 90 ° C.
• the number of cycles was also modified since has gone from 10 cycles to a minimum of 60 cycles.
• the new conditions of the TCT also require that these temperature variations be performed at a voltage of 14 V during the warm-up phases, which leads to additional heating and corresponds to local temperatures that can be approximately up to 120 ° C. .
• the connection or welding zones are generally made at the level of the collector strips (also called "bus bars" in the English terminology) located on either side of the heating network, in the lateral parts of the vehicle. glazing, but can also be done in more central parts.
• EP0281351 discloses a screen printing method for obtaining a thicker ink layer, using, in addition to the screen screen main screen, a second screen piece stuck to the coated surface of the screen.
• the additional screen piece has larger mesh sizes than the main screen.
• the simple superimposition of any piece of screen does not make it possible to obtain electroconductive patterns of satisfactory quality for the desired applications.
• the present invention proposes to produce a glazing coated with electroconductive patterns of variable thickness depending on the part of the glazing on which the patterns are deposited and in particular a pattern considered as thick in one part. central glazing.
• An object of the invention is a screen for printing electroconductive patterns on glass sheets, comprising a main screen having a central portion and at least one side portion, the mesh of the main screen being wider in said at least one side portion in said central portion, said screen further comprising on at least one zone, said double sieve zone, located in said central portion, at least one secondary sieve fixed on one face of said main sieve, the mesh of the each secondary sieve being wider than the mesh of the main sieve in said central part, and the mesh of the or each secondary sieve forming with the mesh of the main mat an angle between 1 and 89 °.
• Such a screen makes it possible to obtain, in a single screen printing pass, glazings having in their central part electroconductive tracks of small thickness and, at the level of the double screen area, thus also in the central part of the glazing, electroconductive patterns, for example. example of welding zones for antenna buttons, particularly thick. In the rest of the text, these patterns will be referred to as "thick electroconductive patterns" or "thick patterns”.
• double sieve zone refers to the parts of the screen comprising both the main screen and the secondary screen, and by extension the corresponding parts of the glass which will be screen printed using this screen. screen.
• simple sieve zone all other parts of the screen, in which only the main screen is used, and by extension the corresponding parts of the glazing.
• the arrangement of the mesh of the secondary screen relative to that of the main screen, according to the angle a allows a better control of the thickness differences of the electroconductive patterns between the double screen areas and the single screen areas. It is indeed important that this difference does not exceed 100 m to avoid any interruption of the electroconductive track at the precise place where it changes thickness. It is also important to check the opening level of the two sieves and thus the transfer of the electroconductive paste. In these respects, the best results are obtained when the angle a is between 15 and 35 °, more particularly between 17 and 27 °.
• the screen is rectangular or substantially rectangular, and the central portion corresponds to the rectangular portion, extending over the entire length of the short side of the screen, the mediator of the short sides corresponds to the mediator of the long sides of the screen, and which occupies 20 to 40% of the surface of the screen.
• the screen preferably comprises two lateral parts, corresponding to the two rectangular parts arranged symmetrically with respect to the mediator of the long sides of the rectangle, on either side of the latter, occupying from 20 to 40% of the surface of the screen.
• the main screen is preferably such that the number of wires per cm in the central part is greater than the number of wires per cm in the at least one lateral part, and the diameter of the wires in the central part is smaller than the diameter of the wires in the at least one lateral part.
• 42 threads per cm for a diameter of 80 ⁇ m, 48 threads per cm for a diameter of 80 ⁇ m, 49 threads per cm for a diameter of 70 ⁇ m.
• This type of main screen allows in particular to deposit a greater thickness of electroconductive paste at the side portions, which correspond to the positioning of the collector strips (or bus bars), compared to the printing areas corresponding to the finer son of the heating network.
• An example of this type of sieve is the Vario® product from SEFAR or Variant® by SAATI, which makes it possible, during the same printing, to obtain different thicknesses in different areas of the glazing.
• the number of yarns per cm of the at least one secondary sieve is less than the number of yarns per cm of the main sieve in the central portion and the sieve yarn diameter is greater than the diameter of the main sieve yarns in the portion Central. It is advantageous to choose sieves having 55 threads per cm for a diameter of 64 ⁇ or 61 threads per cm for a diameter of 64 ⁇ .
• the sieves, main and secondary, can be in any material known for the production of screen printing screens, for example polyester or polyamide.
• the screen includes one or more double screen areas, depending on the number of thick patterns to be deposited.
• the double-screen zones each preferably occupy an area of less than 10% of the surface of the screen, typically between 0.1 and 8%, especially between 0.5 and 5%.
• the double sieve zone (thus the secondary sieve) must be larger than the thick electroconductive layer to be deposited.
• the shape of the double sieve zone (thus the secondary sieve) can be for example circular or ellipsoidal.
• a part of the meshes is closed by a resin obtained by exposure of a photo-crosslinkable emulsion, the secondary sieve being fixed on one face of the main screen with the aid of said resin, as explained in more detail later in the text.
• the invention also relates to a method for obtaining a screen printing screen according to the invention.
• This process comprises the following steps: a) coating a photocurable emulsion on at least a portion of the surface of the main screen, and then
• step a) implements the coating of a photocrosslinkable emulsion over the entire surface of the main screen.
• Step a) is then performed on a "virgin" main sieve, whose meshes have not been previously closed, this embodiment implementing only one insolation step for producing the screen final.
• step a) does not involve the coating of a photo-crosslinkable emulsion at the or each zone where a secondary sieve will be applied in step b).
• step a) is therefore performed on a main sieve having previously been coated with a photocurable emulsion over its entire surface and then insolated. It is therefore a process in recovery, in which one comes to fix the or each secondary sieve on a screen already formed. Unlike the preferred embodiment which has just been described, this embodiment thus implements a total of two insolation steps.
• the method Prior to step a), the method preferably comprises a pre-identification step on the main screen of an area corresponding to an area at center of which it is desired to obtain a thick electroconductive pattern, said area being in a central portion of the glazing. This is the area to become a double sieve area.
• any type of emulsion conventionally used for screen printing screens may be chosen.
• the emulsion is preferably coated on both sides of the main screen.
• the photocurable emulsion makes it possible to selectively seal the meshes of the screen in the areas subjected to exposure, step e) serving in particular to eliminate the emulsion in the zones not subjected to insolation, therefore in the parts where the mesh must remain unobstructed and through which the printing paste must pass during the screen printing and coat the glass sheet to form the electroconductive patterns.
• the secondary sieve is applied to the specific location where it is subsequently desired to obtain a greater thickness of electroconductive patterns.
• the secondary sieve is applied to the still wet emulsion, which allows the emulsion to act as a binder between the two sieves.
• a portion of the emulsion thickness passes through the secondary screen, such as ink that would pass through a blotter, so that the secondary screen naturally seals against the main screen, the adhesion between two screens being excellent.
• a slight pressure can be applied to the surface of the secondary sieve, for example with a spatula, to avoid any inclusion of air bubbles that could be detrimental to good print quality.
• the application of the or each secondary sieve during step b) can be performed on any of the faces of the main sieve. Preferably, it is done on the face of the main screen which will be located on the side of the glass sheet during screen printing, in order to avoid premature damage or shearing of the secondary sieve by the printing squeegee which is used for printing electroconductive silver pastes.
• the or each secondary sieve is preferably previously cut with a punch in a sieve of larger size, said sieve source.
• An extremely sharp cut is indeed necessary, to obtain a contour without defects on the periphery of the sieve secondary. Fiber cut on the borders of the secondary sieve that could be present if the cutting of the secondary sieve was not sufficiently sharp, would cause defects such as cuts of conductive son incompatible with the resolution required for automotive applications.
• the source sieve has a first axis of symmetry, parallel to the meshes of said source sieve, the secondary sieve has a second axis of symmetry, and the cut is made so that the first and second axis of symmetry form the angle at. It is thus easier to respect the obtaining of the angle a when fixing the secondary sieve on the main screen.
• the drying in step c) is preferably carried out at a temperature between 30 and 40 ° C.
• the method according to the invention preferably comprises, between steps c) and d) the following steps:
• Step d) is the insolation step, during which the photocurule emulsion, generally under the effect of ultraviolet radiation.
• the exposure power is typically that which is usually used in the manufacture of conventional screens.
• This step d) is typically carried out by placing against the screen a slide comprising a transparent support, typically polyester, coated with patterns of an ink opaque to ultraviolet radiation, corresponding to the electrically conductive patterns. print on the glazing, and then irradiate said slide with ultraviolet radiation.
• the emulsion is thus crosslinked and only seals the mesh of the screen in the parts of the screen located under the parts of the slide not covered with ink. In the other parts, the emulsion is not crosslinked and is removed in step e), leaving the mesh open, so that the paste can pass through during the screen printing. We thus find identically on the glazing patterns on the slide.
• the method advantageously comprises a step of centering the slide on the screen, so as to ensure the correct alignment of the double sieve area.
• the subject of the invention is also a process for obtaining a glazing coated on one of its faces with electroconductive patterns located in at least one lateral part and in a central part of the glazing, said electroconductive patterns comprising electroconductive tracks of thickness. e1 located in the or each lateral portion and electroconductive tracks of thickness e2 located in the central portion, the thickness e1 being greater than the thickness e2, said patterns further comprising, in the central part at least one electroconductive pattern, said thick, said method comprising printing by screen printing said electroconductive patterns in a single pass, according to the following steps:
• a screening screen according to the invention or a screen printing screen which may have been obtained by the method described above is positioned in relation to a glass sheet, said screen being arranged so that the central and lateral parts of the screen the screen are respectively in correspondence with the parts of the glass sheet intended to become the central and lateral parts of the glazing, and the or each double sieve zone is in correspondence with a zone of the glass sheet intended to be coated with a thick electroconductive pattern, and then
• this method makes it possible, in a single screen printing step, to obtain in the central part of the glazing at the same time electroconductive tracks of small thickness, for example a network of heating wires or antennas. , and at least one thick electroconductive pattern, for example a welding zone for antenna button, which can be located in the middle of said network.
• electroconductive tracks of small thickness for example a network of heating wires or antennas.
• at least one thick electroconductive pattern for example a welding zone for antenna button, which can be located in the middle of said network.
• the screen is preferably arranged so that the or each secondary screen is turned towards the glass sheet, for the reasons indicated above, in order to avoid premature damage or shearing of the secondary screen by the doctor blade. 'impression.
• the electroconductive silver paste comprises in the wet state at most 75%, in particular at most 70% by weight of silver, for example from 66 to 75%, in particular from 68 to 70% by weight of money.
• These low silver content pastes compared to the usual pastes, are particularly suitable for lead-free solder alloys. These low silver content require, on the other hand, to ensure good weldability and good resistance to the TCT test, to apply higher thicknesses, which becomes possible thanks to the method according to the present invention.
• the glazing can be dried or not after the application of the paste.
• the glazing then undergoes a heat treatment to cook the dough.
• This heat treatment is typically a glass bending treatment.
• the thickness in the wet state is typically of the order of 30 ⁇ for a paste containing 75% by weight of silver, and of the order of 50 ⁇ for a paste containing 70% by weight of silver.
• the thickness in the wet state of the or each thick electroconductive pattern is advantageously 30 to 60 ⁇ , to obtain after baking e3 thicknesses of 8 to 15 ⁇ irr, in particular 8 to 12 ⁇ .
• the glass sheet is typically made of soda-lime glass, but may be of other types of glass, for example borosilicate or aluminosilicate. It can be clear, or preferably tinted, for example in green, gray or blue. After screen printing, the glass sheet may undergo various treatments conventionally used in the field of the manufacture of automotive glazing, such as bending and / or tempering treatments, intended for to impart the desired shape and mechanical strength, and simultaneously producing the baking of the dough.
• the invention finally relates to a glazing coated on one of its faces with electroconductive patterns, in particular based on silver, obtained by screen printing and located in at least one lateral part and in a central part of the glazing, said electroconductive patterns comprising electroconductive tracks of thickness e1 located in the or each lateral part and electroconductive tracks of thickness e2 located in the central part, the thickness e1 being greater than the thickness e2, said electroconductive units further comprising, in the central part at least one electroconductive pattern, said thick, whose thickness e3 is at least 8 ⁇ , in particular between 8 and 1 5 ⁇ , and is greater than the thickness e2.
• the thicknesses of the patterns are all measured and expressed after the firing step.
• the thickness e1 is between 8 and 15 ⁇ , for example around 10 ⁇ m, and / or
• the thickness e 2 is between 2 and 5 ⁇ m, for example of the order of 3 ⁇ m, and / or
• the thickness e3 is at most 12 ⁇ and / or
• e3 is substantially equal to e1.
• the glazing according to the invention is preferably a rear window of a motor vehicle, the electroconductive tracks being in particular antennas, collector strips and / or heating wires, and the or each thick electroconductive pattern being a soldering zone for connection of antenna.
• FIGS. 1 and 2 The invention will be better understood in the light of the following exemplary embodiments, illustrated by FIGS. 1 and 2.
• Figure 1 shows a screen screen according to the invention.
• Figure 2 shows a glazing according to the invention.
• the screen 1 comprises a main screen 2 with a variable mesh size, making it possible to obtain different thicknesses of electroconductive patterns on the same glass sheet from a single fabric.
• This main screen is rectangular in shape and comprises a central portion A whose mediator of the short sides corresponds to the median Y of the long sides of the main screen 2.
• the fabric of the main screen 2 in the central part A comprises 90 threads per cm, each of the threads having a diameter of 48 cm. ⁇ .
• the main screen 2 also comprises two lateral parts C, rectangular parts arranged symmetrically with respect to the mediator Y, on either side of the latter.
• the fabric at parts C comprises, for example, 48 threads per cm, each of threads having a diameter of 80 .mu.m.
• Parts B shown in FIG. 1 correspond to transition zones between part A and parts C.
• the screen 1 also comprises, in the central portion A, and attached to the main screen 2 through the photocrosslinkable emulsion, a secondary screen 3, here of ellipsoidal shape.
• the double sieve zone located here is intended to print a thicker weld zone.
• the fabric of the secondary sieve 3 comprises for example 55 threads per cm, each of the threads having a diameter of 64 ⁇ .
• the meshes of the secondary sieve form with the mesh of the main sieve an angle for example of 22 °. To do this, the secondary sieve was pre-cut in a rectangular source sieve using an ellipsoidal punch, the long axis of the ellipse forming an angle of 22 ° with the long side of the sieve source.
• FIG. 2 shows a glazing unit 4 according to the present invention.
• the screen screen 1 and its various constituent parts appear in dashed lines, in order to clearly see the correspondence between on the one hand the elements of the glazing and on the other hand the elements of the screen screen that allowed to obtain the glazing.
• the glazing 4 comprises, as the screen 1, a central portion A and two side portions C respectively corresponding to the central and lateral portions of the screen 1.
• these portions A and C have been printed electroconductive patterns 5, 6, 7 and 8, more specifically a network of horizontal and vertical heating wires 5 connected in the side portions C to collector strips 6, an antenna 8 and an antenna button weld zone 7.
• These son and collector strips were printed according to the method of the invention, by serigraphy of a silver paste on the glass sheet, the thickness after firing being in the example of 3 ⁇ for the son 5 and the antenna 8 in the central part A and 10 m for the collector strips 6 in the lateral part C.
• the welding zone 7 is an electroconductive pattern thicker than the son 5 or the antenna 8, its thickness being between 8 and 15 ⁇ , typically of the order of 10 ⁇ .
• the same screen printing step was performed using a screen that did not include a double screen area.
• the screen printing was carried out using a screen comprising a double screen area, the angle a between the two screens being however 0 °. In both cases, it is observed that the weld zone 7 does not reach the desired thickness after firing, the thickness obtained being only of the order of 3 ⁇ .

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• 2017
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• 2018
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  • 2018-06-15 DE DE102018004838.2A patent/DE102018004838A1/de not_active Withdrawn
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