WO2024068051A1

WO2024068051A1 - Panel, glazing and closure means for a device for heat treatment using microwaves

Info

Publication number: WO2024068051A1
Application number: PCT/EP2023/059171
Authority: WO
Inventors: Benoit Kolheb; Sébastien GASNIER
Original assignee: Schott Vtf
Priority date: 2022-09-26
Filing date: 2023-04-06
Publication date: 2024-04-04

Abstract

The present invention relates to a glazing panel (1) for a heat treatment device, to glazing for closure means and to means for closing the enclosure of a heat treatment device, wherein the panel (1) comprises a rigid support (2) which is substantially transparent to radiation in the visible range and comprises at least a first surface (3), and preferably also a second surface (4), a first lateral edge (5), a second lateral edge (6) and/or a front face (7) and/or a rear face (8), all of which may be covered, partially or completely, continuously or discontinuously, with one or more layers (9) of one or more coatings, the panel (1) further comprising shielding means (10) which reflect and/or absorb microwaves and which are arranged on or attached to the one or more layers (9) of the one or more coatings.

Description

PANEL, GLAZING, AND SHUTTING MEANS, OF A THERMAL TREATMENT DEVICE USING MICROWAVES

Object of the invention

[0001] The present invention relates to the field of heat treatment devices, in particular household appliances, such as for example ovens, which can use or implement microwaves. The invention relates to a glazing panel absorbing and/or reflecting microwaves, to glazing comprising such a panel, and to means for closing an enclosure comprising such glazing, and also relates to a method of producing such a panel, such glazing and such shutter means.

State of the art

[0002] Heat treatment devices generally include a heat treatment enclosure, an opening allowing access to the enclosure, and means for closing this opening, which generally comprise, or are, a door. This door is usually provided with a frame, receiving one or more glazing, transparent or partially transparent, in order to be able to observe the interior of the enclosure of the heat treatment device. Such glazing may comprise a single glazing panel, but is more generally an assembly of one or more glazing means, in particular glazing panels.

[0003] For heat treatment devices using microwaves, such as for example "microwave ovens", the sealing means, such as the enclosure, are capable of confining, and confining, during use of devices, electromagnetic radiation such as microwaves.

The shutter means generally comprise microwave-selective shielding means, comprising, or being, a network of conductors, forming a microwave-opaque mesh.

[0005] For heat treatment devices whose shutter means comprise one or more glazings, the shielding is generally optically transparent to the rays of the visible spectrum and takes the form of a metal grid or of a perforated metal plate, possibly perforated and deployed in order to open the perforations, which are generally fixed to the metal frame of the shutter means, for example of a door.

[0006] For example, document DE3714122 describes a method of producing a door comprising two frames, implementing the fixing, by welding or riveting, of one face of a metal grid on an external door frame, then placing the grille in electrical contact with this frame using enamel or paint, and fixing the other face of the grille to an internal door frame which includes glazing, facing the enclosure from the oven.

[0007] Document JP2005273977 describes a method of producing a door comprising making offset cutouts in a solid metal plate, then deploying the metal plate, in order to form a perforated plate comprising diamond-shaped or hexagonal openings, then insert this perforated plate between two glass panels, the solid, non-perforated edges of the plate being fixed on, and therefore placed in electrical connection with, the door frame.

[0008] Document JPH0652985 describes the welding, using a LASER beam, of the peripheral edge of a perforated metal plate to the metal frame of the door, using clamping means comprising through holes, for example which passes the LASER beam.

[0009] These solutions have the disadvantage of being time-consuming and requiring the implementation of multiple different manipulations during the manufacture of the oven door and therefore during the manufacture of the oven.

[0010] It has also been proposed to fix the shielding means directly on the glazing panel.

[0011] For example, document EP19726003 describes a method for producing a glazing panel, glazing and an oven door, comprising a step of stretching a metal fabric, having a specific mesh, according to one or more dimensions, and fixing the metal fabric, in its stretched and tensioned form, on one or both faces of a glass panel, using an adhesive, or a glue distributed to using a gun.

[0012] However, this solution has the disadvantage of being perfectible, because the adhesive or glue used does not allow optimal adhesion to glass, and have low resistance to high temperatures, which leads to glue dripping on the glazing.

Aims of the invention

[0013] The present invention aims to provide a glazing panel, glazing, and means for closing a heat treatment device, comprising shielding means reflecting and/or absorbing microwaves, and a method of realization of these, which do not present the disadvantages of the state of the art.

The present invention aims to provide an alternative to existing state-of-the-art solutions.

The present invention aims to provide a glazing panel, glazing and shutter means, of a heat treatment device, comprising shielding means reflecting and/or absorbing microwaves, which are more effective and more durable over time.

[0016] The present invention aims to provide a method for producing a glazing panel, glazing and means for closing a heat treatment device, which are easy to implement, economical, effective and fast.

Summary of the invention

The present invention relates to a glazing panel of a heat treatment device comprising a rigid support, substantially transparent to radiation in the visible range, comprising at least a first surface, preferably also a second surface, a first side edge, a second side edge and/or a front face and/or a rear face, covered(s) or covered(s), partially or totally, continuously or discontinuously, with one or more layers of one or several coverings, the panel comprising shielding means, reflecting and/or absorbing microwaves, which are arranged on, or fixed to, said layer(s) of the covering(s).

[0018] According to preferred embodiments of the invention, the glazing panel according to the invention comprises at least one, or any suitable combination, of the following characteristics: - the coating(s) are, or include, vitreous enamel, vitreous enamels, dried ink, a plurality of dried inks, and combinations thereof,

- the enamel or enamels are based on a composition comprising one or more glass frit, one or more pigments, and metallic particles,

- the metal particles are silver particles,

- the shielding means are, or include, a perforated metal plate, a metal grid, a metal mesh, a metal fabric, made of weft and warp threads, a stretched metal fabric, and combinations thereof.

[0019] The present invention also relates to a method of producing a glazing panel of a heat treatment device comprising the steps of taking or producing a rigid support, substantially transparent to radiation in the visible range, and comprising at least at least a first surface, preferably a second surface, a first side edge, a second side edge and/or a front face and/or a rear face, to take, or produce, one or more compositions of one or more coatings, to deposit the composition(s) on all or part of the at least first surface and/or the second surface and/or the first side edge and/or the second side edge and/or the front face and/or the face rear, continuously or discontinuously, to form one or more layers of coatings, to harden said coating(s), to take or produce shielding means, reflecting and/or absorbing microwaves, to place on, or fix , hardened coating(s), shielding means.

[0020] According to preferred embodiments of the invention, the method of producing the panel according to the invention comprises at least one, or any suitable combination, of the following characteristics:

- the coating(s) are, or include, vitreous enamel, vitreous enamels, dried ink, a plurality of dried inks, and combinations thereof, and in which, the step of hardening the composition(s) coatings includes, or consists of, carrying out a vitrification of the enamel or enamels, and/or drying the ink(s),

- the step of fixing the shielding means to the hardened coating(s) is carried out using a LASER beam generated by a LASER source. [0021] The present invention also relates to the use of the glazing panel according to the invention, for producing glazing of means for closing the enclosure of a heat treatment device.

[0022] The present invention relates to a glazing of means for closing an enclosure of a heat treatment device, comprising the glazing panel according to the invention, or the glazing panel produced by implementing the steps of the method of producing the glazing panel according to the invention, and additional glazing means, and also relates to its use for producing means for closing an enclosure of a heat treatment device.

[0023] The present invention also relates to a method of producing glazing of shutter means of a heat treatment device comprising the implementation of the method of producing the glazing panel according to the invention, and the carrying out one or more steps of combining the glazing panel obtained according to the method of producing the glazing panel according to the invention with one or more other glazing panels according to the invention and/or with additional glazing means.

[0024] The present invention also relates to means for closing an enclosure of a heat treatment device comprising a frame, provided with glazing according to the invention, and to a method for producing means for closing an enclosure of a heat treatment device comprising the implementation of the method of producing the glazing of shutter means according to the invention, and the step of taking or producing a frame comprising, or cooperating with, means forming hinge, and fix the frame to the glazing of the invention.

[0025] The present invention further relates to a heat treatment device comprising a heat treatment enclosure and the closing means according to the invention, which, in a particular embodiment of the invention is a micro-oven waves.

Brief description of the figures

[0026] Figure 1 is a schematic representation of a side view of a particular embodiment of the glazing panel support according to the invention. Figure 2 is a schematic representation of a side view of the glazing panel according to the invention.

[0028] Figure 3 is a schematic representation of a top view of a particular embodiment of shielding means.

Detailed description of the invention

[0029] In the remainder of the description and the claims, the term "length" is used to describe the largest of the measurements of one side of any geometric shape, for example the major radius of an ellipsoid or of an ellipse, the base or height of a triangle, the length of a trapezoid or a rectangle. The term "width" is used to describe the smallest of measurements, for example the small radius of an ellipsoid or ellipse, the base or height of a triangle, the width of a trapezoid or a rectangle, and the terms “length” and “width” can be used interchangeably, for example to designate the measurement of the radius of a disk, the side of a square. The terms “front” and “rear” refer to the position of the panel according to the invention 1, as shown in Figures 1 and 2.

The glazing panel 1 according to the invention comprises a support 2, rigid, substantially inflexible, which has mechanical resistance to bending and/or torsional stresses, sufficient not to deform under its own weight, or under the action of a bending and/or twisting force.

The support 2 has an adequate shape and dimensions adapted, or compatible, with the final use of the panel 1, or of the elements which comprise such a panel 1.

Preferably, the support 2 is substantially planar, and comprises at least a first surface 3, advantageously continuous and substantially planar, preferably optionally also a second surface 4, advantageously continuous and substantially planar, opposite said first surface 3 by relative to the X-Z plane, of the arbitrary XYZ reference frame of the figures.

Preferably, the support 2 has a cross section, in the plane formed by the first surface 3, or the second surface 4, therefore in the plane XZ, of circular, elliptical, polygonal, trapezoidal shape or of a quadrilateral, advantageously a diamond, square or rectangular section. Preferably, the support 2 has a longitudinal section, in the plane XY, and/or a transverse section, in the plane YZ, perpendicular to the plane formed by the first surface 3 or the second surface 4, which is circular, elliptical or polygonal , trapezoidal or else a quadrilateral, advantageously a square or rectangular section, a trapezoid or a rectangular trapezoid.

[0034] In a particular embodiment, shown in Figure 1, the support 2 takes the shape of a parallelepiped, rectangle or square. Thus, in addition to the first surface 3 and the second surface 4, the support 2 comprises a first side edge 5 and a second side edge 6, opposite the first side edge 5 with respect to the plane Y-Z, and comprises a front face 7 and a face rear 8, opposite the front face 7 relative to the X-Y plane.

The support 2 is made of any suitable material or sets of materials. It is inert, preferably at least thermally inert, advantageously also physically and chemically inert to the material(s) covering or in contact with all or part of these surfaces 3, 4, side edges 5, 6 and/or faces 7 , 8.

The support 2 is preferably transparent, or partially transparent, to the rays of the visible domain, in its thickness and/or its width and/or its length. It can be sandblasted and/or screen printed and/or colored on part of one or both surfaces 3 and 4 and/or side edges 5, 6 and/or front faces 7 and/or rear 8. preferably, the support 2 comprises or is made of plastic, glass, a crystalline or semi-crystalline material, a ceramic or a glass ceramic.

[0038] In a preferred embodiment of the invention, the support 2 is glass, preferably transparent or mass-tinted soda-lime glass, possibly with various layers, such as antibacterial, anti-reflective, for example example of the type known under the brand Matelux®, chrome-plated, with low emissivity, for example of the type known under the name Planibel Clear or Planibel low-E IsoComfort, marketed by the company AGC, or a borosilicate for example known under the brand Borofloat® 33. Preferably, the glass has a high content of SiC>2, a content advantageously between 69% and 81% by weight and with a light transmission of up to 90%. The glass may have possibly previously undergone a heat treatment such as hardening, annealing, quenching, bending.

The first surface 3 and/or the second surface 4 and/or the first side edge 5 and/or the second side edge 6 and/or the front face 7 and/or the rear face 8 of the support 2, is or are covered or covered, partially or totally, continuously or discontinuously, with one or more layers 9 of one or more hardened coatings, which is or are preferably an enamel or several hardened enamels, or vitrified, and/or one or more dried inks.

[0040] In the embodiments in which the support 2 comprises several layers 9 of one or more coatings, enamel, enamels, ink, plurality of inks, and combinations thereof, these layers 9 are, whatever are their nature and/or their composition, arranged on the support 2 adjacently, so as to touch each other or not, superimposed, overlapping with or on top of each other, and any combinations thereof, in order to to form, preferably, one or more decorative patterns, which may include, or be, one or more signs, geometric shapes, images and combinations thereof. Thus, the support 2 can include all the combinations, all the types of associations, superpositions, overlaps, possible and adequate, between an enamel, enamels, an ink, inks, and any combinations of these. this.

[0041] The total thickness of the coating layer(s) 9 is preferably between 1 and 100 jt/m, advantageously between 3 and 100 m for the embodiments comprising an enamel or enamels and/ or, one or more inks.

[0042] Preferably, the composition(s) of the coating(s), enamel, enamels, ink and inks are chosen according to the final use of the panel 1 according to the invention, and possibly also depending on the shielding means 10 covering, or in contact with, the layer or layers 9 of the coating(s).

Preferably, the composition of the enamel or enamels comprises a vitrifiable medium, a vitrifiable material, which is any suitable material or mixture of materials, to form an enamel; preferably, it is a frit or mixture of glass frits, such as for example a borosilicate and/or soda glass frit. calcium for the embodiments in which the support 2 is made of glass, and one or more pigments. Advantageously, the vitrifiable medium is a compound, or set of compounds, making it possible in particular to reduce the melting temperature and to increase the expansion coefficient. It may include Boron, Sodium, Potassium, Lithium Vanadium oxides, or any mixture of these compounds.

The enamel or enamel composition(s) may also comprise one or more mattifying agents, which are, or include, mineral powders.

[0045] Preferably, the ink(s) are air-drying, thermal-drying or Ultra-Violet drying. They are based on a composition comprising a solvent, or binder, aqueous or non-aqueous, one or more pigments, dissolved or suspended in the solvent, and optionally one or more additives, making it possible to optimize the printing characteristics. ink and/or printed ink, such as stabilizers, dispersants, anti-foams or preservatives.

[0046] Preferably, the compositions of the coating(s), enamel, enamels, ink or inks, further comprise one or more metallic elements or compounds, which have the advantage of promoting the fixing of the shielding means 10 according to the invention on the support 2, and in particular directly on the coating(s) of the support 2, and more particularly on the enameled support 2. The enamel or enamels may comprise the metallic element(s), the ink or inks may comprise the metallic element(s), and in embodiments implementing both an enamel or more enamels and an ink or more inks, the metallic element(s) can be found, both in the ink(s) and the enamel(s).

[0047] Preferably, the metallic element is or comprises silver, even more advantageously silver particles, having dimensions between 1 and 5 pm, which has the advantage of further improving the fixing the shielding means 10, in particular when their fixing on the coating(s), and more particularly on the enamel or enamels, of the support 2, uses a LASER beam. [0048] In a particular embodiment, the silver particles are found in an enamel or enamels having the form of a paste comprising one or more glass frits, for example borosilicate and/or soda-lime glasses, and a binder. This has the advantage of being easier to implement with the enamel or enamel composition(s).

[0049] In the embodiments using one or more inks, the silver is in the form of particles suspended in the solvent.

[0050] The glazing panel 1 according to the invention further comprises shielding means, substantially opaque to microwaves, which are arranged on, preferably in contact with, advantageously fixed or welded to, the layer(s) 9 of the or coatings, enamel, glazes, ink, plurality of inks, and combinations thereof.

[0051] The glazing panel 1 according to the invention thus has the advantage of being a functional panel 1, namely absorbing and/or reflecting microwaves, while also being decorative.

[0052] In the embodiments in which the shielding means 10 are directly fixed to or welded to the part(s) covered with the covering(s) of the support 2, these are, preferably, without the use of an adhesive or an adhesive layer, nor a product or solder paste or solder paste. However, an adhesive layer, for example of the Silicone type, or an adhesive, for example a two-sided adhesive, can be used to fix the shielding means 10 directly to the part or parts of the support 2 without coverings. In these embodiments of the invention the adhesive layer or the adhesive covers, preferably with continuous material, the periphery, the periphery of the support 2.

[0053] In the embodiments in which the shielding means 10 are in contact with the support 2 without being fixed there, they are held in place during the production of the glazing according to the invention, for example by fixing or installation of additional glazing means, for example another glazing panel, can be, but not necessarily, a glazing panel 1 according to the invention, and/or one or more films, coatings, plates, sheets and any combinations of these. The shielding means 10 may comprise a single type of means, of a single nature or having a single structure, or any suitable combination of means of different natures and structures.

The shielding means 10 are provided, continuously or discontinuously, on all or part of the coating(s), enamel, enamels, ink, plurality of inks, and combinations thereof, of all or part of the first surface 3, second surface 4, first side edge 5, second side edge 6, front face 7, rear face 8, or any combination thereof.

[0056] In a preferred embodiment, the first surface 3 and the second surface 4 comprise the same shielding means 10, which preferably also extend over the first side edge 5 and/or the second side edge 6 and / or the front face 7 and/or the rear face 8.

[0057] In a preferred embodiment, the first surface 3 and the second surface 4 are each covered with distinct shielding means, preferably shielding means of different nature and/or structure.

[0058] Preferably, the shielding means 10 comprise, or are, a perforated metal plate, possibly deployed in order to open the perforations so that they form diamond-shaped or hexagonal openings, and/or a metal grid and/or or a metal mesh and/or a metal fabric, made of weft and warp threads, interwoven according to a specific or any weave, a fabric which can possibly be in a stretched form once fixed on the enameled support 2.

[0059] In a preferred embodiment, the shielding means comprise a metal fabric 11, made of or comprising metal fibers of the metal fabric having a warp diameter "d", and a weft diameter "d'", "d" and "d'" which may be identical or different between weft and warp, spaced in warp by a distance "w" and in weft by a distance "w'", "w" and "w'" which may be identical or different between weft and warp (Figure 3).

The metal fibers can be interwoven in any suitable weave, for example in a plain, twill or satin weave.

[0061] Preferably, the metal fabric 11 is extensible, deformable, which has an adequate stretching capacity allowing it to move from a “rest” state to a “stretched” state. Preferably, it has a Young's modulus of between 190 and 230 GPa. Preferably, it is made of, or comprises, stretchable wires or fibers, advantageously metallic, made of or comprising one or more metals, or one or more alloys of suitable metals, advantageously chosen from silver, chromium, platinum, copper, stainless steel, their alloys or a mixture thereof.

[0062] The shape of the openings, or meshes, of the metal fabric 11, the dimensions "w" and "w'", and the thickness "d" of the fibers are chosen according to the type of microwave to be absorbed or to reflect on. For a metal fabric 11 intended to be stretched on the enameled support 2, its characteristics before stretching, its stretching rate and the stretching direction(s), are chosen so that the shape and dimensions of the meshes of the fabric stretched metal, are suitable for microwaves to absorb or reflect.

[0063] Panel 1 according to the invention is preferably used as glazing for closing means of a heat treatment enclosure, for example as glazing for a door of a microwave or combined oven.

The glazing according to the invention comprises at least one panel 1 according to the invention. It may further comprise, arranged above the layer(s) 9 of the coating(s), enamel, enamels, ink, plurality of inks, and combinations thereof, and preferably also above the(s). parts of the support 2 not covered with the coating(s), additional glazing means, preferably another glazing panel, one or more functional and/or decorative coatings, films, plates and/or sheets, and combinations thereof .

[0065] These additional glazing means have adequate dimensions and thicknesses, and preferably particular properties, which are advantageously a function of the final use of the glazing according to the invention or of the shutter means which comprise it or of the device heat treatment.

Preferably, the other glazing panel of the additional glazing means is or comprises dimensions and/or characteristics identical or similar to those of the support 2 of the glazing panel 1 according to the invention.

[0067] These additional glazing means are fixed to the glazing panel 1 according to the invention by any suitable means, for example an adhesive layer or an adhesive, which advantageously does not cover the shielding means 10, but the or the portions of the support 2 which are not covered with the coating(s), enamel, enamels, ink, plurality of inks, and combinations thereof.

[0068] Thus, the glazing of the shutter means of a heat treatment device according to the invention comprises the panel 1 according to the invention, whose first surface 3, and/or its second surface 4 and/or its first lateral edge 5 and/or its second lateral edge 6 and/or its front face 7 and/or its rear face 8 of the support 2, is or are covered(s) or covered(s), partially or totally, with one or several layers 9 of one or more hardened coatings, vitreous enamel, vitreous enamels, dried ink, plurality of dried inks, and combination thereof, on which or which are in contact, or directly attached or welded, means of shielding 10, as described above, and one or more other glazing panels, coatings, films, plates, sheets and combinations thereof, arranged superimposed or adjacent to each other, and covering all or part of the shielding means 10 and/or all or part of the support 2 not covered by the shielding means 10.

[0069] The glazing according to the invention is preferably used as part of the means of closing a heat treatment enclosure, for example as glazing of a door of a microwave oven or an oven. mixed, called “combined”.

[0070] The shutter means according to the invention comprise a frame and glazing according to the invention, namely glazing comprising at least one panel 1 according to the invention, including the first surface 3, and/or its second surface 4 and/or its first side edge 5 and/or its second side edge 6 and/or its front face 7 and/or its rear face 8 of the support 2, is or are covered(s) or covered(s), partially or completely, of one or more layers 9 of the hardened coating(s), enamel, enamels, ink, plurality of inks, and combinations thereof, vitrified and/or dried, on which or which are in contact, or directly fixed or welded, shielding means 10, as described above, and one or more coatings, films, plates, sheets and combinations thereof, arranged superimposed or adjacent to each other, and covering all or part of the shielding means 10 and/or all or part of the support 2 not covered by the shielding means 10. [0071] For a glazing panel 1 not comprising means for electrical contact with the shielding means 10, the one-piece frame can act as electrical contact means.

[0072] The frame can have all the shapes and dimensions adapted to the enclosure that it must close, to the glazing and to the panel 1 according to the invention. It is made of, or includes, all suitable materials, compatible with its final use.

[0073] Preferably, the frame is provided at the periphery of the glazing according to the invention, and advantageously, it covers at least part of the shielding means 10, in order to form the electrical contact means.

[0074] Preferably, the frame comprises, or is capable of cooperating with, means forming a hinge.

[0075] The closing means according to the invention are used to reversibly seal a heat treatment enclosure of a heat treatment device, for example as the door of a microwave oven or a combined oven. The heat treatment device according to the invention comprises a cooking chamber and the closing means according to the invention. Preferably, it is a so-called microwave oven or a combination oven.

The method of producing a glazing panel 1 according to the invention comprises a step of taking or making the support 2, as described previously. It may further comprise one or more pretreatment steps of all or part of these surfaces 3, 4, side edges 5, 6 and/or faces 7, 8, preferably to eliminate possible surface contaminants and/or structure the surface. surface at least in two dimensions, preferably in three dimensions, or the creation of surface roughness, using chemical and/or mechanical means. Preferably, the chemical means may include, be or use any acids or mixtures of acids to which the glass support 2 is sensitive, such as for example hydrofluoric acid. The mechanical means may include, be or implement tools and/or abrasive materials, or a LASER source.

The method of producing the glazing panel 1 according to the invention comprises the step of taking, or producing, one or more compositions of one or more coatings, enamel and/or enamels and/or one or more inks, as described previously, and to apply it or them to all or part of the first surface 3 and/or the second surface 4 and/or the first side edge 5 and/or the second side edge 6 and/or the front face 7 and/or or the rear face 8, to form one or more layers 9 of one or more coatings, enamel, enamels and/or ink(s), on the support 2, in order to obtain a decorated support 2. This application step is preferably carried out directly on the support 2, without the use of an adhesion layer, and can be done by any suitable method, for example by screen printing, by pad printing, by offset, by digital printing or by inkjet. It can be done continuously or discontinuously, according to one or more determined patterns, or to form one or more layers 9, of one or more enamel coatings, enamels, ink, plurality of inks, and combinations thereof, continuous or discontinuous, arranged adjacently, or to form a succession of layers 9, which can be superimposed and/or overlapped with each other.

[0079] The coating(s) are then hardened, the enamel and enamels vitrified, the ink or inks dried.

[0080] In the embodiments in which the coating(s) are or comprise an enamel or enamels, the vitrification step comprises, or is, a quenching step, which comprises at least one heating then rapid cooling step. , or a succession of heating and cooling stages. It allows the vitrification of the composition or compositions of enamel or enamels on the support 2, which makes it possible to definitively freeze the layer or layers 9 of enamel or enamels on the support 2, and has the advantage of reinforce their mechanical characteristics and their resistance during the subsequent stages of the method according to the invention.

[0081] Preferably, the heating step or steps are carried out at different temperatures, advantageously gradually, at increasing temperatures, before sudden cooling.

[0082] It may also be advantageous to add Sulfur, preferably in the form of Sulfur dioxide, at the end of quenching, which makes it possible to improve its physical and mechanical characteristics, in particular its hardness, in order to facilitate its setting. in charge for the subsequent stages of the method according to the invention, in particular the maneuvering means and the conveying means. [0083] In the embodiments in which the support 2 is made of glass, the panel 1 is then made in one piece with a peripheral part, a part of its thickness or of these edges, which is enameled, and a part , a heart, made of glass.

[0084] By way of example, for a glass support 2, the tempering step is carried out by heating to a temperature of between 600°C and 750°C, for a period of between one minute and ten minutes, of preferably between two and five minutes, then by rapid cooling, between five seconds and five minutes, at a temperature increasing in this period of time from 450°C to 60°C.

[0085] In the embodiments in which the coating(s) are or comprise one or more inks, their drying comprises, or implements, all the appropriate steps, which depend on the nature and type of ink used, drying in the open air, thermal or Ultra-Violet.

[0086] In the embodiments in which the coating(s) are, or comprise, both an enamel, or enamels, and one or more inks, the vitrification of the enamel, or enamels, is carried out before the deposition of the ink or inks, which are then dried.

[0087] Preferably, the decorated, enameled and/or printed panel 1 is washed with water.

[0088] The method of producing the glazing panel 1 according to the invention further comprises a step of taking, or producing, shielding means 10, opaque or substantially opaque to microwaves, which prevent or reduce the passage of radiation microwaves, and a step of placing them on, preferably putting them in contact with, or fixing or welding them, on all or part of the support 2, preferably on the layer(s) 9 of the coating(s), enamel , enamels, ink, plurality of inks, and combinations thereof. It is possible to use an adhesive layer, for example of the Silicone type, or an adhesive, for example a two-sided adhesive; nevertheless, for fixing the shielding means 10 on all or part of the decorated, enameled and/or printed support 2, the use of a LASER beam is preferred, advantageously for spot welding.

[0089] Preferably, before fixing the shielding means 10, the surface(s) 3, 4, side edges 5, 6 and/or faces 7, 8, intended to receive the shielding means 10, coated or not with one or more coatings, enamel, enamels, ink, plurality of inks, and combinations thereof, are cleaned using one or more chemical agents, for example an ethanol solution, and/or mechanical means and/or a LASER source.

[0090] In the embodiments in which the shielding means 10 comprise a stretchable metal fabric 11, the latter is previously stretched, preferably by 0.01 to 5% relative to its rest state, advantageously in all directions , according to its width or frame (Z-Z' plane of Figure 1), its length or warp (X-X' plane of Figure 1), but preferably not in its thickness (Y-Y' plane of Figure 1), according to one or more levels of stretching according to the zones of the metal fabric 11, advantageously so that these meshes are stretched between 50 and 100%, compared to those of the metal fabric 11 at rest.

[0091] Preferably, the tension exerted on the metal fabric 11 to stretch it, and keep it taut on the support 2, is 5 to 25 Newtons.

[0092] The metal fabric 11 is held in a stretched, taut, therefore contracted form, before and during its attachment to the support 2, for example the first surface 3 and/or the second surface 4, and possibly the first lateral edge 5 and /or the second side edge 6 and/or the front face 7 and/or the rear face 8. Alternatively, the metal fabric covering the edge(s) 6, 7 and/or the front face 7 and/or the rear face 8, may not be in stretched form, but in a resting state.

[0093] The step of fixing the shielding means 10 by welding using a LASER beam has the advantage of allowing effective, precise and visually decreed welding of the shielding means on the support 2, without causing excessive or too extensive heating of the support 2, thus limiting the risks of deformation. The layer(s) 9 of the coating(s), enamel, enamels, ink, plurality of inks, and combinations thereof, the composition of which comprises metallic particles, elements or compounds, making it possible to facilitate the welding operation by creating a metal/metal interaction. In particular, compositions comprising silver particles, in particular as described above, allow more efficient welding.

[0094] Preferably, the LASER beam is applied continuously, or repeatedly, for less than a minute, preferably a few seconds, on the shielding means 10, so that the latter are fixed, preferably welded, on the support 2 decorated, preferably up to a few millimeters, for example between 5 and 25mm from the end of the first surface 3 and/or the second surface 4, from the side edge(s) 5, 6 and/or 6 and /or the front face 7 and/or the rear face 8.

[0095] The LASER source can be fixed, or mounted movable in rotation and/or translation, relative to the support 2, and/or the support 2 can be fixed, or mounted movable in rotation and/or translation, preferably mounted on a support holder.

[0096] Preferably, the method of producing the glazing panel 1 may include the production, on all or part of the decorated support 2, of electrical contact means, for electrical contact with the shielding means 10.

[0097] The method of producing the glazing of the shutter means of a heat treatment device according to the invention comprises the step of taking the panel 1 according to the invention, or implementing the method of producing the panel 1 glazing of a heat treatment device according to the invention, a step of taking, or producing, additional glazing means, which are or include, another glazing panel, one or more coatings, films, plates, sheets and combinations of these, which are preferably transparent, of the same nature and/or characteristics and/or dimensions as the support 2, and a step of covering, with these additional glazing means, all or part of the shielding means 10 and/or all or part of the support 2 not covered by the shielding means 10.

[0098] The application of these additional glazing means can be done by any suitable method.

[0099] For a glazing panel 1 not comprising means of electrical contact with the shielding means 10, the method of producing the glazing can further comprise a step of producing and fixing such means, before or after, the covering the support 2 by the additional glazing means. Advantageously, the additional glazing means are the electrical contact means.

[0100] The method of producing means for closing an enclosure of a heat treatment device according to the invention comprises the implementation of the method of producing the glazing according to the invention, of taking or producing a frame monobloc, or made of an assembly of frame elements, and fixing the glazing according to the invention to the frame.

[0101] Preferably, the method of producing shutter means further comprises a step of taking, or producing, means forming a hinge and fixing them on the frame, before or after the installation of the glazing according to the invention in the framework.

[0102] The method of producing a heat treatment device comprises the step of taking, or making, a cooking enclosure, preferably hermetic, or substantially hermetic, to microwaves, the step of taking, or making the shutter means according to the invention, preferably produced using the method described above, and a step of connecting the shutter means to the enclosure.

Claims

1. Glazing panel (1) of a heat treatment device comprising a rigid support (2), substantially transparent to radiation in the visible range, comprising at least a first surface (3), preferably also a second surface ( 4), a first side edge (5), a second side edge (6) and/or a front face (7) and/or a rear face (8), covered(s) or covered(s), partially or totally , continuously or discontinuously, of one or more layers (9) of one or more coverings characterized in that said panel (1) comprises shielding means (10), reflecting and/or absorbing microwaves, which are arranged on, or attached to, said layer(s) (9) of said coating(s).

2. The glazing panel (1) according to claim 1, wherein the coating(s) are, or comprise, vitreous enamel, vitreous enamels, dried ink, a plurality of dried inks, and combinations thereof -this.

3. The glazing panel (1) according to claim 2, in which the enamel or enamels are based on a composition comprising one or more glass frit, one or more pigments, and metal particles.

4. The glazing panel (1) according to claim 3, in which the metal particles are silver particles.

5. The glazing panel (1) according to any one of the preceding claims, in which the shielding means (10) are, or comprise, a perforated metal plate, a metal grid, a metal mesh, a metal fabric, made of weft and warp yarns, a drawn metallic fabric, and combinations thereof.

6. Method for producing a glazing panel (1) of a heat treatment device comprising the steps of:

- take or produce a rigid support (2), substantially transparent to radiation in the visible range, and comprising at least a first surface (3), preferably a second surface (4), a first lateral edge (5), a second side edge (6) and/or a front face (7) and/or a rear face (8), - take, or produce, one or more compositions of one or more coatings,

- deposit said composition(s) on all or part of said at least first surface (3) and/or the second surface (4) and/or the first side edge (5) and/or the second side edge (6) and /or the front face (7) and/or the rear face (8), continuously or discontinuously, to form one or more layers (9) of coatings,

- harden said coating(s),

- take or produce shielding means (10), reflecting and/or absorbing microwaves,

- place on, or fix, said hardened coating or coatings, said shielding means (10).

7. The method of producing a glazing panel (1) according to claim 6, in which the coating(s) are, or comprise, vitreous enamel, vitreous enamels, dried ink, a plurality of dried inks, and combinations thereof, and in which the step of hardening said coating composition(s) comprises, or consists of, carrying out vitrification of said layer(s) (9) of enamel or enamels , and/or drying said ink(s).

8. The method of producing a glazing panel (1) according to any one of claims 6 or 7, in which the step of fixing the shielding means (10) to said hardened coating or coatings is carried out using using a LASER beam generated by a LASER source.

9. Use of the glazing panel (1) according to claims 1 to 5, for the production of glazing for closing means of the enclosure of a heat treatment device.

10. Glazing of means for closing an enclosure of a heat treatment device comprising the glazing panel (1) according to any one of claims 1 to 5, or produced by implementing the steps of the method of production of the glazing panel (1) according to claims 6 to 8, and additional glazing means.

11. Method of producing glazing of shutter means of a heat treatment device comprising the implementation of the method of producing a glazing panel (1) according to any one of claims 6 to 8 , and carrying out one or more steps of associating said glazing panel (1) thus obtained, with one or more other glazing panels according to any one of claims 1 to 5 and/or with additional glazing means.

12. Use of the glazing according to claim 10 to produce means for closing an enclosure of a heat treatment device.

13. Means for closing an enclosure of a heat treatment device comprising a frame provided with glazing according to claim 10.

14. Method for producing the means for closing an enclosure of a heat treatment device comprising the implementation of the method for producing the glazing of the closing means according to claim 11, and the step of taking or produce a frame comprising, or cooperating with, means forming a hinge, and fixing said frame to said glazing.

15. Heat treatment device comprising a heat treatment enclosure and the shutter means according to claim 14.

16. The heat treatment device according to claim 15 being a microwave oven.