Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B44—DECORATIVE ARTS
  • B44F—SPECIAL DESIGNS OR PICTURES
  • B44F1/00—Designs or pictures characterised by special or unusual light effects
  • B44F1/06—Designs or pictures characterised by special or unusual light effects produced by transmitted light, e.g. transparencies, imitations of glass paintings
• • 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
  • B41M7/02—Dusting, e.g. with an anti-offset powder for obtaining raised printing such as by thermogravure ; Varnishing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B44—DECORATIVE ARTS
  • B44D—PAINTING OR ARTISTIC DRAWING, NOT OTHERWISE PROVIDED FOR; PRESERVING PAINTINGS; SURFACE TREATMENT TO OBTAIN SPECIAL ARTISTIC SURFACE EFFECTS OR FINISHES
  • B44D2/00—Special techniques in artistic painting or drawing, e.g. oil painting, water painting, pastel painting, relief painting

Definitions

• the present invention relates to a method for obtaining a pattern on a substrate made of glass material, and also a substrate obtained by this process.
• the enamels used for this application are generally obtained at starting from what is called an enamel composition
• an enamel composition comprising a powder essentially consisting of at least one glass frit (which plays the role of vitreous matrix) and pigments as dyes in particular, pigments being based on metal oxides, and a medium allowing the application of the composition of enamel on the substrate and its temporary adhesion therewith.
• the medium chosen according to the destination of the enamel must ensure a good setting suspension of the frit particles and pigments used and must be consumed during of cooking the enamel. This medium can include solvents, thinners, oils, resins ...
• the very technique of screen printing leaves visible in the decorative motif a screen revealing the screen fabric.
• the substrate coated with the screened pattern looks somewhat like a fabric.
• the object of the invention is therefore to remedy the aforementioned drawbacks, and in particular to propose a new process for obtaining a pattern on a substrate in glass material, adaptable to both small and large series and which allows to have a particularly aesthetic motif, of very high definition and sustainable over time without doing so at the expense of cost Manufacturing.
• the invention relates to a process for obtaining a pattern on a substrate made of glass material.
• adhesive an adhesive containing a solvent capable of evaporating to ambient air, one-component adhesive, aqueous adhesive, hot-melt adhesive or photosensitive resin, resin thermosensitive.
• the hardening according to step b) will consist respectively of a drying, heating or sun exposure using a radiation source adequate.
• mineral particles means any reflective mineral element with a refractive index very distant from that of bare substrate.
• the mineral particles which change the appearance and / or structure of the bare substrate, at least one part serves as a binder whose melting temperature is lower than that at which the substrate is subjected to.
• the adhesive used is a photo resin and / or thermosensitive.
• step d) With regard to the "fixing of mineral particles” stage relating to step d) according to the invention obtained by a heat treatment cycle, this is the aforementioned part which serves as a binder which melts during this same treatment cycle thermal.
• a variant of the invention may consist in that all the mineral particles melt during the heat treatment cycle of step d).
• An advantageous consequence of the method according to the invention is that it is of a simple and inexpensive implementation, the operating conditions do not requiring no special precaution, if not a good mastery of exposure step b) so as to obtain crosslinking of the polymer, in the variant where the glue is a photosensitive resin.
• the method according to the invention allows "personalization” as desired decorative pattern without requiring long preparation and careful use of specific tool (s), significant advantage over the industrial plan.
• sensitivity range When used in conjunction with the polymer as defined above, its sensitivity range extends to a wavelength of approximately 0.5 micron i.e. beyond the ultraviolet range (the limit of which greater than 0.38 ⁇ m). This eliminates the choice of a source of very specific radiation to carry out step b).
• the crosslinkable polymer which has proved to be the most suitable is made from acrylate and dipropylene glycol diacrylate.
• the photosensitive resin according to the invention contains a sensitizing agent, preferably less than 10% by weight
• the speed of movement of the radiation source can be chosen to be between 4 and 60 m / min.
• the sensitizing agent chosen is a benzothiazole derivative or naphthothiazole or possibly for the purpose of increasing sensitivity spectral, an anilinovinyl-heterocycloammonium salt. More preferably, said sensitizing agent is 1-N (methylbenzothiazolylidene) dithioacetate methyl.
• step c) of the method according to the invention it is preferable to perform the exposure using a source of radiation, in particular ultraviolet, illuminating the entire surface of the substrate.
• a source of radiation in particular ultraviolet
• the choice of particle size average of the mineral particles is such that their diameter is at most equal to the dimension of the elementary points to be exposed, preferably less than a tenth.
• a very fine grinding of the mineral particles is carried out, grinding all the more finely as one seeks to have a significant contrast between the different parts of the decorative pattern and / or a resolution of the significant pattern.
• a particle diameter less than d 90 less than or equal to 10 ⁇ m, preferably less than 5 ⁇ m is particularly preferred.
• the diameter of the particles d 10 is preferably chosen between 0.2 ⁇ m and 1 ⁇ m and, more preferably, the diameter d 50 is between 1 ⁇ m and 4 ⁇ m. It is recalled that these terms “d 90 ", “d 50 “ and “d 10 " mean that respectively 90%, 50% and 10% of the mineral particles in question have a diameter less than the value indicated. The value d 90 gives a clear idea of the particle size. Combined with the values of d 10 and / or d 50 , it completely specifies the distribution of particle sizes in a given range of diameter values.
• the substrate is preferably subjected to a thermal treatment cycle of mineral particles, at temperatures greater than or equal to the melting temperatures of these particles in particular between 300 and 950 ° C, more preferably around 620 ° C.
• the glue must be removed at temperatures below those necessary to achieve the fusion of mineral particles.
• the above-mentioned heat treatment cycle is part of a heat treatment cycle of quenching, annealing or bending.
• the composition based on mineral particles can comprise a metallic powder and / or a ceramic powder and / or a powder based on metal oxides and / or functional particles of the pigment type phosphorescent or luminescent.
• the glass frit contains forming oxides for form the essential constituents of vitreous matter, modifying oxides able to modify this glassy matrix and capable of influencing the melting point and intermediate oxides which, depending on their environment and their proportions play the role of forming oxide and / or modifying oxides.
• pigments in proportions such as the weight ratio between the glass frit and the pigments is between 50/50 and 90/10 preferably between 70/30 and 60/40 for 100 parts of sintered mixture and pigments.
• a particle size of the pigments is chosen substantially equal to that of the particles of the glass frit. So preferred, the diameter of the pigments is less than 10 ⁇ m, in particular understood between 1 and 5 ⁇ m.
• steps a) b) c) are carried out according to the invention, n times successively on the same area by applying the same glue, the n enamel compositions being remarkable in that each of them mainly comprises pigments of black or white or imparting a single color.
• the four compositions mainly comprise set of black or white pigments and giving the three colors fundamental, each of them mainly comprising pigments of black or white conferring only one of the three fundamental colors.
• the titanium oxide TiO 2 is preferably chosen as the white pigment.
• pigments giving the basic blue color (cyan) Co 3 O 4 pigments are advantageously chosen.
• pigments giving the basic red (magenta) and yellow color it is preferable to choose cadmium oxide pigments CdO mixed with cadmium sulfo-selenide pigments, the relative proportions of which are modulated to obtain one ( red) or the other (yellow) of the basic colors.
• the decorative pattern obtained according to the invention can be a visible image monochrome or polychrome, in particular four-color, and when this is the case, the resolution of the image is in accordance with the above.
• Such finesse allows viewing the image at multiple distances, which results in the fact that two observers at a different distance from the substrate will distinguish details different image.
• the invention is applicable to the manufacture of any decorative glazing with high resolution such as a glazed light sign, a glazed oven door with a cooker blindfold, a display case, internal partition, a stained glass window.
• We can also associate by laminating the glazing according to the invention with another glazing of so as to give it particular properties.
• This other glazing can by example be a transparent substrate coated with thin layers giving it a very specific functionality such as an anti-reflective, anti-fog, anti-fouling function.
• the composition based on mineral particles includes silver paste.
• the invention is also applicable to the manufacture of "front faces" emissive screens of the flat screen type such as plasma screens.
• a plasma screen consists of two glass substrates superimposed on each other, constituting the front and rear faces of the screen.
• the high resolution provided by the method of the aforementioned invention is, as for it, perfectly adapted.
• a solution containing a compound is prepared in inactinic light photosensitive.
• the photosensitive compound consists of 50% acrylates and 50% dipropylene glycol diacrylate.
• a UV photoinitiating agent is added to this photosensitive compound. in proportions by weight of less than 5%.
• the resin thus formed has a viscosity corresponding to a time flow rate of the order of 24 s, time determined by means of a cut in accordance with ISO 2431-1984. We then realize a enamel composition.
• the particle size of the glass frit particles was measured: the diameters d 10 , d 50 , d 90 have a value of 0.2 ⁇ m, 1.25 ⁇ m and 10 ⁇ m respectively.
• these finely ground particles are mixed with titanium oxide pigments TiO 2 whose diameters d 10 , d 50 , d 90 respectively have a value of 0.4 ⁇ m, 2 ⁇ m, 7 ⁇ m in a proportion such that the weight ratio between pigments and glass frit is 30/70 per 100 parts of the sintered mixture and pigments.
• composition of the enamel is in weight proportions as follows: 42% of PbO, 4.9% of ZnO, 1.9% of SiO 2 , 1.4% of ZrO 2 , 0.9% of Al 2 O 3 , 0.14% SrO and 48% TiO 2 .
• the glass frit assembly plus pigments thus formed is mixed with a medium which is alcohol.
• An insolation is then produced using a UV lamp with a specific power of approximately 80 W / cm 2 .
• the enamel particles which have not adhered are removed by washing with lukewarm water at a temperature of the order of 50 ° C.
• the substrate thus coated is subjected to a heat treatment cycle. This decomposes in a burning of the resin at 430 ° C for 1 hour then by baking the enamel and tempering the glass substrate around 620 ° C.
• the substrate thus obtained comprises an enameled zone which reproduces a very high definition visible monochrome image, the resolution of which is equal to 150 D.p.i. This excellent resolution is directly linked to the ability to concentration of the laser beam, and in particular of the order of 10 ⁇ m.
• the thickness of the enameled area depends on the application requested. She varies from 5 to 100 ⁇ m after drying.

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• Surface Treatment Of Glass (AREA)
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Cited By (20)

Citations (10)

• 1999
  • 1999-01-15 FR FR9900368A patent/FR2788457B1/fr not_active Expired - Fee Related
• 2000
  • 2000-01-13 EP EP00400080A patent/EP1020303A1/de not_active Withdrawn

Patent Citations (10)

Non-Patent Citations (1)

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