EP3868177B1 - Microwave reflective panel, elements comprising such a panel, and method for obtaining same - Google Patents

Microwave reflective panel, elements comprising such a panel, and method for obtaining same Download PDF

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Publication number
EP3868177B1
EP3868177B1 EP19726003.7A EP19726003A EP3868177B1 EP 3868177 B1 EP3868177 B1 EP 3868177B1 EP 19726003 A EP19726003 A EP 19726003A EP 3868177 B1 EP3868177 B1 EP 3868177B1
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EP
European Patent Office
Prior art keywords
metal fabric
panel
fabric
glazing
support
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Active
Application number
EP19726003.7A
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German (de)
French (fr)
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EP3868177A1 (en
Inventor
Benoit Kolheb
Sébastien GASNIER
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.)
Schott VTF SAS
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Schott VTF SAS
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Publication of EP3868177A1 publication Critical patent/EP3868177A1/en
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Publication of EP3868177B1 publication Critical patent/EP3868177B1/en
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Classifications

    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/76—Prevention of microwave leakage, e.g. door sealings
    • H05B6/766—Microwave radiation screens for windows

Definitions

  • the present invention relates to a panel absorbing and/or reflecting microwaves, to glazing and closing means for an oven using microwaves, comprising such a panel, and to a method for obtaining such a panel, and such glazing and such shutter means.
  • Microwaves are electromagnetic radiation, used in industry in many technical fields. They are also used daily by professionals or individuals, in the field of household appliances, and more particularly heat treatment devices, such as ovens.
  • microwaves there are ovens commonly called “microwaves”, because they only use microwave radiation for heating and rapid cooking of food, and so-called “mixed” or “combined” ovens, because they use microwaves and one or more several other sources of heat production, such as for example an electrical resistance or an infrared source, as opposed to so-called “traditional” ovens using only one type of heat source, such as for example gas or electricity .
  • Ovens using microwaves, generally comprise a cooking enclosure, which confines the radiation, and means for closing an opening through which the products to be thermally treated are placed in the oven, which usually comprise, or are, a door, capable of limiting or preventing the escape of microwaves from the enclosure.
  • the door includes glazing that has little or no transparency to microwaves through the use of shielding.
  • the means of shielding the glazing comprise or consist of a network of conductors forming a mesh, which has the advantage of maintaining a certain optical transparency, in the visible range, and a certain opacity to microwaves.
  • the mesh size of such a network is generally between 1 and 2 mm, which represents 10% of the wavelength of microwaves used in an oven, which have a wavelength of 12 cm for a frequency generally fixed at 2.5 GHz in the most ovens. This allows approximately 90% of the microwaves generated within the oven to be reflected.
  • the shielding means may be a metal grid, attached to the metal part of the microwave oven door frame, using enamel or paint, as described in the document DE3714122 , or a metal mesh, placed between an exterior window and an internal window, the space being joined using silicone, or an expanded metal plate, obtained by shearing and concomitant stretching of a metal plate, to form a wire mesh having a hexagonal or diamond-shaped pattern, as described in the document JP 2005273977 , or a metallic fabric, woven with conductive threads, as described in the document US2018054860 .
  • the shielding means can also be a network of conductors, obtained by screen printing on a glass support, and which is covered with a transparent or colored protective enamel layer coated with electrically conductive and transparent layers from the point of view optical, as described in the document FR2484397 .
  • the document GB2322276 describes the combined use of a metal mesh, reflecting microwave energy, with a plastic film absorbing microwave energy.
  • the present invention aims to provide a panel absorbing and/or reflecting microwaves, a glazing comprising such a panel, and a method of manufacturing such a panel and glazing, which do not present the disadvantages of the state of the technical.
  • the present invention aims to provide an alternative to existing solutions of the state of the art.
  • the present invention aims to provide a panel absorbing and/or reflecting microwaves and glazing comprising such a panel, the final aesthetic rendering of which is improved.
  • the present invention also aims to provide a method of manufacturing a panel and a glazing, in particular for ovens, which is quick and easy to implement.
  • the present invention relates to a panel for glazing comprising a rigid support, substantially transparent to radiation in the visible range, and comprising at least one surface, comprising a periphery, and one or more edges, in which the panel comprises a stretched metal fabric on, and fixed on, all or part of the at least one surface, the metal fabric being in constrained form.
  • the present invention also relates to glazing comprising at least one panel according to the invention.
  • the present invention further relates to means for closing a heat treatment enclosure comprising the glazing according to the invention, and a frame, fixed on and/or surrounding the glazing, the frame being in electrical contact with the metal fabric and comprising, or cooperating with, means forming a hinge allowing the closing of the heat treatment enclosure.
  • the present invention further relates to a heat treatment device using microwaves comprising a heat treatment enclosure and the shutter means according to the invention.
  • the present invention also relates to a method of producing a panel according to the invention, comprising the steps of taking a rigid support substantially transparent to radiation in the visible range, and comprising at least one surface, a periphery, and one or several edges, to take a metal fabric in a "rest” state, to stretch it to move it from the "rest” state to a “stretched” state, and to keep it taut, to fix, using fixing means, the metal fabric, held taut and in constrained form, on all or part of the at least one surface, so as to keep it stretched on the surface.
  • the present invention also relates to a method of producing glazing according to the invention, comprising the steps of taking a panel, produced by implementing the method of producing the panel according to the invention, of taking or producing one or more coverings, to take or make one or more plates of the same nature and/or characteristics and/or dimension as that(s) of the support, to cover all or part of the metal fabric or all or part of the surface(s) of the support not covered by the metal fabric, or both at the same time, with the covering(s), with the plate(s), or, at the same time, with one or more coverings and one or more plates, the covering(s) being arranged adjacent or superimposed with respect to each other, the plate(s) being arranged adjacent or superimposed with respect to each other, or the covering(s) being arranged adjacent to or superimposed on the plate(s), the covering(s) being arranged on the plate(s), or vice versa, the plate(s) being arranged on the covering(s).
  • the present invention furthermore relates to a method of producing shutter means, of a heat treatment enclosure, according to the invention, comprising the steps of taking a glazing, produced by implementing the method of producing glazing according to the invention, take a frame, fix it on the glazing, at the level of, or on the, means of fixing the metal fabric on the support and/or on one or more edges of the support so that the frame is in electrical contact with the metal fabric.
  • the present invention also relates to a method of producing a heat treatment device using microwaves comprising the steps of taking a cooking chamber, of taking the shutter means, produced by implementing the method of producing the shutter means according to the invention, and to connect the shutter means to the enclosure.
  • the term "length” is used to describe the largest of the measurements on one side of any geometric shape, for example the major radius of an ellipsoid or a ellipse, the base or height of a triangle, the length of a trapezoid or 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.
  • front refers to the normal position of the panel according to the invention, and of its constituent elements, as represented in the figure 1 .
  • the panel 1 according to the invention comprises a support 2, which is rigid and substantially inflexible. It has sufficient mechanical resistance to bending and/or twisting stresses so as not to deform under the action of a bending and/or twisting force.
  • the support 2 has a shape, thickness and dimensions adequate and adapted, or compatible, with the final use of the panel 1, or of the elements which comprise such a panel 1.
  • the support 2 comprises at least one upper surface 3, continuous and substantially flat, preferably also a lower surface 4, continuous and substantially flat, opposite the upper surface 3 ( figure 1 ).
  • the support 2 has a cross section, therefore in the plane formed by the surface 2 or the surface 3, in the X-Z plane, of circular, elliptical, polygonal, trapezoidal or even a quadrilateral shape, advantageously a diamond section , square or rectangular.
  • the support 2 has a longitudinal section, therefore in the X-Y plane, and/or a transverse section, therefore in the Y-Z plane, perpendicular to the plane formed by the surface 2 or the surface 3, circular, elliptical or polygonal, trapezoidal or a quadrilateral, advantageously a square or rectangular section, a trapezoid or a right-angled trapezoid.
  • the support 2 comprises at least a first lateral edge 8, and in the embodiments in which it has a parallelepiped transverse and/or longitudinal section, for example square(s) or rectangular(s), it comprises a second lateral edge 9 , opposite the first side edge 8, a front edge 10 and a rear edge 11, opposite the front edge 10.
  • the support 2 is made of an inert material, preferably at least thermally inert, advantageously also physically and chemically inert to the material(s) with which one or both of these surfaces 2 and 3 is/are covered ( s) or in contact.
  • the support 2 is preferably transparent, or partially transparent, optically in the visible range, 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.
  • the support 2 is made of, or comprises plastic, glass, a crystalline or semi-crystalline material, a ceramic or a glass-ceramic.
  • the support 2 is glass, preferably transparent or mass-tinted soda-lime glass, possibly with various layers, such as anti-bacterial, anti-reflective, for example of the type known as the Matelux ® brand, chrome-plated, low-emissivity, for example of the type known under the name of Planibel Clear or Planibel low-E IsoComfort, marketed by the company AGC, or a borosilicate for example known under the brand Borofloat ® 33.
  • the glass has a high SiO 2 content, a content advantageously between 69% and 81% by weight and with a light transmission of up to 90%.
  • the glass may possibly have previously undergone heat treatment such as hardening, annealing, quenching, bending.
  • the panel 1 comprises anti-microwave shielding means comprising a metal fabric 5, fixed on all or part of one of the surfaces 3 or 4, preferably on the two surfaces 3 and 4 of the support 2, the metal fabric 5 being in constrained form.
  • the metal fabric 5 is stretched over the surface(s) 3, 4. It is in a stretched form between the edges 8, 9, 10, 11 of the support 2.
  • the metal fabric 5 is in an elongated form on the support 2. It undergoes, on the support 2, the action of one or several traction forces, continuously, even as it covers the surface(s) 3, 4.
  • the metal fabric 5 can protrude from one or more edges 8 of the support 2, and also cover it or them, nevertheless preferably in unstretched form, therefore in the rest state.
  • the panel 1 according to the invention has barrier properties, or microwave reflection properties, preserved or improved, while providing improved optical transparency in the visible range.
  • the metal fabric 5 according to the invention is deformable, in particular it is elastically extensible. It has an adequate stretching capacity allowing it to move from its “rest” state, while it is not installed on the support 2, to its “stretched” state once it covers the surface(s). 3, 4. It also has elastic properties allowing it to regain, at least partially, its shape and size, after having lost them by extension. Consequently, due to its elasticity, the metal fabric 5 is stretched on the support 2, and undergoes, within the panel 1, tension forces created by the tendency of the metal fabric 5 to return to its resting state.
  • it has a Young's modulus of between 190 and 230 GPa.
  • it is obtained by weaving metallic or metal-covered threads or fibers, fibers made of or comprising one or more metals, or one or more suitable metal alloys, advantageously chosen from silver, chromium, platinum, copper, stainless steel, their alloys or a mixture thereof.
  • the metal fibers have a warp diameter "d", and a weft diameter "d", “d” and “d” which may be identical or different between weft and warp, spaced in chain by a distance " w” and in weft with a distance "w'", “w” and “w'” which may be identical or different between weft and warp.
  • the metal fibers can be interwoven in any suitable weave, for example in a plain, twill or satin weave.
  • the metal fabric 5 is stretched by 0.01 to 5% relative to its rest state.
  • the tension exerted on the metal fabric 5, for such stretching is also a function of the nature of the threads making up the metallic fabric 5, of their stretching capacity and their elasticity, and therefore of the stretching capacity and the general elasticity of the metallic fabric 5.
  • a metal fabric 5 of substantially square or rectangular shape depending on its width or frame (plane ZZ' of the figure 1 ), its length or chain (plan XX' of the figure 1 ), but preferably not in its thickness (plane YY' of the figure 1 ).
  • the metal fabric 5 is stretched, and held taut on the surface(s) 3, 4 of the support 2, in all directions of its width and its length, whatever or its shape.
  • the metal fabric 5 is stretched differently on its surface 3, 4, therefore in the plane it forms, the X-Z plane, for example according to a first level of stretching for one or more portions of its periphery , with a central portion not stretched or stretched according to a second stretching level, lower than the first stretching level. However, and preferably, it is stretched homogeneously over its entire surface from its central portion to its periphery.
  • the shape of the days, or meshes, of the metal fabric 5 stretched in the panel 1, and their sizes or dimensions "w" and "w'", in stretched form, is chosen depending on the type of microwave to be absorbed or to reflect on.
  • the metal fabric 5 has the same mesh shape in its stretched state as in its rest state.
  • the mesh is deformed between these two states, a deformation obtained by a difference in stretching over its width and/or its length.
  • the meshes are stretched between 50 and 100%, that is to say the meshes have dimensions "w" and/or "w'" which are one and a half or two times those of the metal fabric 5 at rest.
  • the stretched mesh can be a rectangular or diamond mesh, but it is preferably square, because such a mesh makes it possible to obtain the most aesthetic and uniform transparency of the panel 1, and therefore of the device that includes it.
  • the metallic fabric 5 at rest comprises square meshes with dimensions “w” and “w'” of between 60 to 100 ⁇ m.
  • the metal fibers are made of stainless steel with an identical diameter "d” and “d'”, of between 200 and 300 ⁇ m.
  • the percentage of daylight varies from 35 to 50% and having a fineness of between 30 and 120 mesh/inch, namely between 30 and 120 mesh per 25.4 mm.
  • the metallic fabric 5 comprises square meshes ( figure 2 ), whose dimensions “w” and “w'” are between 120 to 220 ⁇ m.
  • the metal fibers have an identical diameter "d" and "d'", of between 50 and 100 ⁇ m.
  • the tension exerted on the metal fabric 5 to stretch it, and keep it taut on the support 2 is 5 to 25 Newtons.
  • the metal fabric 5 according to the invention has a fineness of approximately 43 mesh/inch (43 meshes per 25.4mm), with 46% days, and comprising square meshes of a dimension "d » in warp and “d'” in weft of approximately 160 ⁇ m, formed by stainless steel wires having a diameter “w” in warp and “w'” in weft of approximately 70 ⁇ m.
  • the metal fabric 5, in a stretched form, is fixed, continuously or discontinuously, on the surface(s) 3, 4, using fixing means 6, an adhesive, or a glue, compatible with the nature of the metal fabrics 5, the support 2, the final device integrating the panel 1 according to the invention and its final use.
  • an adhesive or a glue, compatible with the nature of the metal fabrics 5, the support 2, the final device integrating the panel 1 according to the invention and its final use.
  • it is an adhesive having good resistance when subjected to high temperatures, around 250°C. It can be a single-component silicone glue, an acetic-based silicone glue or a neutral-based silicone glue.
  • the metal fabric 5 is fixed, preferably, on all or part of the periphery 7 of one of the surfaces 3 or 4 ( figure 1 ), preferably a few millimeters, for example 5 to 25 mm, from the edges 8 of the support 2, possibly also on one or more edges 8. This has the advantage of making invisible the points or areas of bonding of the metal fabric 5 in the final device integrating the panel 1 according to the invention.
  • the panel 1 according to the invention is used, preferably, in the field of household appliances, advantageously as glazing of an appliance domestic or professional household appliances, even more advantageously as glazing of a door of a microwave or combination oven.
  • the glazing according to the invention comprises the panel 1 according to the invention. It may further comprise one or more coatings, or films, superimposed or arranged adjacent to each other, covering all or part of the metal fabric 5 and/or of the surface(s) 2, 3, or portions of the surfaces 2, 3 of the support 2, not covered with the metal fabric 5, preferably with the exception of the metal fabric 5 protruding from the edge(s) 8 of the support 2.
  • the coatings or films have adequate dimensions and thicknesses and preferably particular properties, which advantageously depend on the final use of the glazing or the device or means comprising the glazing. It may be a protective coating, preferably thermal protection, and/or anti-condensation.
  • the panel 1 may further comprise a transparent plate, or sheet, of the same nature, same characteristics and dimensions as those forming the support 2, placed on the metal fabric 5, on the coating(s) covering the metal fabric 5 and/or on the surface(s) 3, 4 of the support 2.
  • the other surface can be covered by one or more coverings arranged adjacent or superimposed on each other or by one or more plates arranged adjacent or superimposed on each other, or by both one or more coverings and one or more plates, the plate(s) being arranged adjacently or superimposed on the (x) coating(s) or coating(s) covering the plate(s).
  • a first or a first series of coatings, or one or a first series of plates can cover the entire metal fabric 5, the coating(s) capable of penetrating the mesh of the metal fabric 5, a second or second series of coatings, or one or second series of plates, which can then cover the first or first series of coatings or the first or first series of plates.
  • the glazing can be a multi-layer product, comprising either a alternation of coverings and plates, i.e. one or more coverings on one or more plates, or conversely, one or more plates on one or more coverings.
  • the coating(s) or plate(s) can cover either the metal fabric 5 or the surface 3 and/or 4 not comprising fabric metallic 5, or both at the same time. If a first or a first series of coatings, or a first or a first series of plates, only cover part of the metal fabric 5, a second or a second series of coatings, or one or second series of plates can cover the remainder of the metal fabric 5, and possibly also the first or first series of coverings or first or first series of plates. It is also possible to provide that a third or third series of coverings, or one or third series of plates, cover all or part of the first series and/or second series of coverings and/or plates.
  • the panel 1 according to the invention is preferably used as means of closing a heat treatment enclosure, for example as the door of a microwave or mixed oven.
  • the shutter means according to the invention comprise the glazing according to the invention and a frame, in one piece or made from an assembly of frame elements, fixed on, or surrounding the glazing, and comprising, or cooperating with, means forming a hinge allowing the closing of the heat treatment enclosure.
  • the frame has 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.
  • the frame is positioned at the level, preferably, covers the fixing means 6 of the metal fabric 5 on the support 2, therefore the periphery 7 of one of the surfaces 3 or 4 of the support 2, which has the advantage to make the fixing means 6 invisible.
  • the frame can also cover one or more edges of the glazing and therefore one or more edges 8 of the panel 1, possibly including the portion(s) of the metal fabric 5 protruding from the support 2.
  • the frame is made of, or includes, all suitable materials, compatible with its end use, in particular with its use as an oven door.
  • the frame is in electrical contact with the metal fabric 5, at least with its portion covering the surface(s) 3, 4 and/or that extending beyond or covering one or more edges 8 of the support 2.
  • This electrical contact has the advantage of dissipating microwave radiation.
  • the heat treatment device comprises a cooking chamber and the closing means according to the invention.
  • a cooking chamber Preferably, it is a so-called microwave oven or a combi oven.
  • the present invention also relates to a method of producing a panel 1 according to the invention.
  • the method includes the step of taking, or making, the support 2 and the metal fabric 5 as described previously.
  • the metal fabric 5 is placed in its resting state on a table provided with stretching means, for example a table provided with jaws over its entire periphery, and the fabric is fixed in these stretching means.
  • a table provided with stretching means for example a table provided with jaws over its entire periphery
  • the metal fabric 5 is elongated in at least one direction, preferably in all directions, namely along its length and/or its width, and maintained in a stretched state, preferably by 0.01 to 5% relative to its state of rest.
  • the stretching of the metal fabric 5 is obtained by applying a force of between 5 and 25 Newtons.
  • the method may further comprise the fixing on the metal fabric 5 of one or more separator elements, making it possible to delimit at least one, preferably several zones of stretched metal fabric 5, and its cutting along the separator(s). This has the advantage of having portions of stretched metal fabric 5 and therefore of facilitating their handling for the implementation of the other stages of the process.
  • the size and dimensions of the separator(s) depend on those of the support 2 and therefore those of the panel 1.
  • the method comprises the step of taking, or making, a support 2 as described above, of depositing fixing means 6, on all or part of the periphery 7 of one of the surfaces 3 or 4, preferably a few millimeters away of the edges 8 of the support 2, possibly also on one or more of the edges 8 9, 10, 11.
  • the application of the fixing means 6 implements a pneumatic gun, which has the advantage of gaining precision and obtaining better homogeneity of the fixing means 6 on the surface(s) 3, 4.
  • the stretched metal fabric 5, or a portion of the latter, provided with its separator element(s), is brought into contact with the support 2 provided with the fixing means 6.
  • the metal fabric 5 stretched, or one of these portions which is placed on the support 2.
  • pressure is exerted on the metal fabric 5, so that the fixing means 6 penetrate into, and preferably pass through, these meshes.
  • the method further comprises a step of removing the separator element(s) from the stretched metal fabric 5.
  • the method may further comprise a step of cutting the metal fabric 5 projecting beyond the edges 8, 9, 10, 11 of the support 2, preferably leaving a margin with respect to said edges 8, 9, 10, 11, which depends on the final use of the panel according to the invention. For example, for microwave oven glazing, this margin will be approximately 5 to 25 mm.
  • the method of producing the glazing according to the invention comprises the step of taking, or producing, the panel 1 according to the invention, preferably manufactured according to the method described previously, a step of taking, or producing, one or more coatings, or films, and/or one or more plates, or sheets, transparent, of the same nature, same characteristics and dimensions as those forming the support 2, a step of covering all or part of the metallic fabric 5 and/or all or part of one or more surfaces 3, 4 of the support 2 not covered by the metal fabric (5), using the covering(s) or one or more plates.
  • the metal fabric 5 covers only one of the surfaces 3 or 4 of the support 2, it is possible to cover the other surface 3 or 4 with one or more coverings arranged adjacent or superimposed on each other, or by one or more plates arranged adjacent or superimposed on each other, or by both one or more coverings and one or more plates, the plate(s) being arranged adjacently ) or superimposed on the coating(s), or the coating(s) covering the plate(s).
  • the metal fabric 5 completely covers one or both surfaces 3, 4 at the same time, it is possible to cover it partially or completely, preferably with the exception of the metal fabric 5 extending beyond the edges 8, 9, 10, 11 of the support 2, by a first or a first series of coverings, or one or a first series of plates, then to cover it or them with a second or a second series of coverings, or one or more other plates, in order to obtain a multi-layer product, comprising either a succession of layers of coverings or a succession of plates, or an alternation of coverings and plates, or one or more coverings on one or more plates, or conversely, one or more plates on one or more coverings .
  • the metal fabric 5 partially covers one or both surfaces 3, 4 at the same time, it is possible to cover it and/or to cover the surfaces 3, 4 not covered by the metal fabric 5, with one or more coverings or by one or more plates. If a first or a first series of coatings, or a first or a first series of plates, only cover part of the metal fabric 5, it is possible to cover the rest of the metal fabric 5, and possibly also the first or first series of coatings or first or first series of plates, using a second or second series of coatings, or one or second series of plates. It is also possible to cover all or part of the first series and/or second series of coverings and/or plates using a third or third series of coverings, or one or third series of plates.
  • the application of the coating(s), films, plates or sheets can be done by any suitable method.
  • the method of producing means for closing a heat treatment enclosure, in particular a door of a microwave or mixed oven comprises the step of taking or producing glazing according to the invention, preferably manufactured according to the method described above, to take or make a one-piece frame, or made of an assembly of frame elements, and to fix the frame on the glazing, preferably at the level of, or on, the fixing means 6 metal fabric 5 on the support 2 and/or one or more edges of the glazing.
  • the method further comprises a step of taking, or producing, means forming a hinge and fixing them on the frame, before or after installing the frame on the glazing.
  • 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 means of shutter according to the invention, preferably carried out using the method described above, and a step of connecting the shutter means to the enclosure.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Surface Treatment Of Glass (AREA)
  • Laminated Bodies (AREA)

Description

Objet de l'inventionObject of the invention

La présente invention a trait à un panneau absorbant et/ou réfléchissant les microondes, à un vitrage et des moyens d'obturation pour un four utilisant des microondes, comprenant un tel panneau, et à une méthode d'obtention d'un tel panneau, et d'un tel vitrage et de tels moyens d'obturation.The present invention relates to a panel absorbing and/or reflecting microwaves, to glazing and closing means for an oven using microwaves, comprising such a panel, and to a method for obtaining such a panel, and such glazing and such shutter means.

Etat de la techniqueState of the art

Les micro-ondes sont des rayonnements électromagnétiques, utilisées dans l'industrie dans de nombreux domaines techniques. Ils sont également mis en oeuvre quotidiennement par des professionnels ou des particuliers, dans le domaine des appareils électroménagers, et plus particulièrement des appareils de traitement thermique, comme des fours.Microwaves are electromagnetic radiation, used in industry in many technical fields. They are also used daily by professionals or individuals, in the field of household appliances, and more particularly heat treatment devices, such as ovens.

Ils existe des fours communément appelés « microondes », car utilisant uniquement le rayonnement micro-onde pour le chauffage et la cuisson rapide d'aliments, et des fours dits « mixtes » ou « combinés », car utilisant les micro-ondes et une ou plusieurs autres sources de production de chaleur, comme par exemple une résistance électrique ou une source infrarouge, en opposition aux fours dits « traditionnels » n'employant qu'un seul type de source de chaleur, comme par exemple du gaz ou de l'électricité.There are ovens commonly called "microwaves", because they only use microwave radiation for heating and rapid cooking of food, and so-called "mixed" or "combined" ovens, because they use microwaves and one or more several other sources of heat production, such as for example an electrical resistance or an infrared source, as opposed to so-called “traditional” ovens using only one type of heat source, such as for example gas or electricity .

Les fours, mettant en oeuvre des micro-ondes, comprennent généralement une enceinte de cuisson, qui confine les rayonnements, et des moyens d'obturation d'une ouverture par laquelle les produits à traiter thermiquement sont enfournés, qui comprennent, ou sont, habituellement une porte, apte à limiter voir empêcher la fuite des micro-ondes hors de l'enceinte. Généralement, la porte comprend un vitrage peu ou pas transparent aux micro-ondes par l'emploi d'un blindage.Ovens, using microwaves, generally comprise a cooking enclosure, which confines the radiation, and means for closing an opening through which the products to be thermally treated are placed in the oven, which usually comprise, or are, a door, capable of limiting or preventing the escape of microwaves from the enclosure. Generally, the door includes glazing that has little or no transparency to microwaves through the use of shielding.

Classiquement, les moyens de blindage des vitrages comprennent ou sont constitués d'un réseau de conducteurs formant un maillage, qui présente l'avantage de conserver une certaine transparence optique, dans le domaine du visible, et une certaine opacité aux micro-ondes. La taille des mailles d'un tel réseau est généralement comprise entre 1 et 2 mm, ce qui représente 10% de la longueur d'onde des micro-ondes utilisés dans un four, qui possèdent une longueur d'onde de 12 cm pour une fréquence généralement fixée à 2,5 GHz dans la plupart des fours. Cela permet de réfléchir environ 90% des micro-ondes générées dans l'enceinte du four.Conventionally, the means of shielding the glazing comprise or consist of a network of conductors forming a mesh, which has the advantage of maintaining a certain optical transparency, in the visible range, and a certain opacity to microwaves. The mesh size of such a network is generally between 1 and 2 mm, which represents 10% of the wavelength of microwaves used in an oven, which have a wavelength of 12 cm for a frequency generally fixed at 2.5 GHz in the most ovens. This allows approximately 90% of the microwaves generated within the oven to be reflected.

Les moyens de blindage peuvent être une grille métallique, fixée à la partie métallique du cadre de la porte de four micro-ondes, à l'aide d'émail ou de peinture, comme décrit dans le document DE3714122 , ou bien un treillis métallique, disposé entre une vitre extérieure et une vitre interne, l'espace étant jointé à l'aide de silicone, ou encore une plaque de métal déployé, obtenu par cisaillement et étirement concomitant d'une plaque de métal, pour former un treillis métallique ayant un motif hexagonal ou en forme de losange, comme décrit dans le document JP 2005273977 , ou alors un tissu métallique, tissé de fils conducteurs, comme décrit dans le document US2018054860 .The shielding means may be a metal grid, attached to the metal part of the microwave oven door frame, using enamel or paint, as described in the document DE3714122 , or a metal mesh, placed between an exterior window and an internal window, the space being joined using silicone, or an expanded metal plate, obtained by shearing and concomitant stretching of a metal plate, to form a wire mesh having a hexagonal or diamond-shaped pattern, as described in the document JP 2005273977 , or a metallic fabric, woven with conductive threads, as described in the document US2018054860 .

Les moyens de blindage peuvent également être un réseau de conducteurs, obtenu par sérigraphie sur un support en verre, et qui est recouvert d'une couche d'émail de protection transparente ou colorée revêtus de couches conductrices d'électricité et transparentes du point de vue optique, comme décrit dans le document FR2484397 .The shielding means can also be a network of conductors, obtained by screen printing on a glass support, and which is covered with a transparent or colored protective enamel layer coated with electrically conductive and transparent layers from the point of view optical, as described in the document FR2484397 .

Même si le vitrage des fours micro-ondes est sensiblement transparent aux rayons dans le domaine du visible, cette transparence est fortement réduite par la présence du blindage anti micro-ondes, à savoir la grille métallique, et il est très difficile, pour l'usager, de pouvoir voir aisément l'intérieur de l'enceinte du four. Par ailleurs, non seulement un tel vitrage présente un aspect parfaitement inesthétique, il confère également au four, qui comprend un tel vitrage, une connotation « four micro-ondes », qui peut s'avérer être négative pour certains utilisateurs, surtout s'agissant de fours mixtes.Even if the glazing of microwave ovens is substantially transparent to rays in the visible range, this transparency is greatly reduced by the presence of the anti-microwave shielding, namely the metal grid, and it is very difficult for the user, to be able to easily see the inside of the oven enclosure. Furthermore, not only does such glazing present a completely unsightly appearance, it also gives the oven, which includes such glazing, a "microwave oven" connotation, which may prove to be negative for certain users, especially when it comes to of combi ovens.

Toutefois, pour offrir une excellente visibilité aux utilisateurs et atténuer le rayonnement des micro-ondes pour de tels fours combinés, le document GB2322276 décrit l'emploi combiné d'un treillis métallique, réfléchissant l'énergie de micro-ondes, avec un film plastique absorbant l'énergie des micro-ondes.However, to provide excellent visibility to users and attenuate microwave radiation for such combination ovens, the document GB2322276 describes the combined use of a metal mesh, reflecting microwave energy, with a plastic film absorbing microwave energy.

Buts de l'inventionAims of the invention

La présente invention vise à fournir un panneau absorbant et/ou réfléchissant les micro-ondes, un vitrage comprenant un tel panneau, et une méthode de fabrication d'un tel panneau et vitrage, qui ne présentent pas les inconvénients de l'état de la technique.The present invention aims to provide a panel absorbing and/or reflecting microwaves, a glazing comprising such a panel, and a method of manufacturing such a panel and glazing, which do not present the disadvantages of the state of the technical.

La présente invention vise à fournir une alternative aux solutions de l'état de la technique existantes.The present invention aims to provide an alternative to existing solutions of the state of the art.

La présente invention vise à fournir un panneau absorbant et/ou réfléchissant les micro-ondes et un vitrage comprenant un tel panneau, dont le rendu esthétique final est amélioré.The present invention aims to provide a panel absorbing and/or reflecting microwaves and glazing comprising such a panel, the final aesthetic rendering of which is improved.

La présente invention vise également à fournir une méthode de fabrication d'un panneau et d'un vitrage, en particulier pour fours, qui soit rapide et aisée à mettre en oeuvre.The present invention also aims to provide a method of manufacturing a panel and a glazing, in particular for ovens, which is quick and easy to implement.

Résumé de l'inventionSummary of the invention

La présente invention porte sur un panneau pour vitrage comprenant un support rigide, sensiblement transparent au rayonnement dans le domaine du visible, et comprenant au moins une surface, comprenant une périphérie, et un ou plusieurs bords, dans lequel le panneau comprend un tissu métallique tendu sur, et fixé sur, tout ou partie de la au moins une surface, le tissus métallique étant sous forme contraint.The present invention relates to a panel for glazing comprising a rigid support, substantially transparent to radiation in the visible range, and comprising at least one surface, comprising a periphery, and one or more edges, in which the panel comprises a stretched metal fabric on, and fixed on, all or part of the at least one surface, the metal fabric being in constrained form.

Selon des modes préférés de l'invention, le panneau selon l'invention comprend au moins une, ou une combinaison quelconque appropriée, des caractéristiques suivantes :

  • le tissu métallique, tendu comprend un pourcentage d'étirement, dans la direction de trame et/ou de chaine, compris entre 0,01 à 5% par rapport à son état de « repos »,
  • le tissu métallique est tendu sous une tension comprise entre 5 et 25 Newtons,
  • le tissu métallique est fixé, à l'aide de moyens de fixation, sur tout ou partie de la périphérie d'au moins une surface du support,
  • le tissu métallique tendu comprend des mailles carrées dont la distance de chaine « w » et/ou la distance de trame de « w' » est comprise entre 120 et 220 µm.
According to preferred embodiments of the invention, the panel according to the invention comprises at least one, or any suitable combination, of the following characteristics:
  • the stretched metal fabric includes a percentage of stretching, in the weft and/or warp direction, of between 0.01 to 5% compared to its “rest” state,
  • the metal fabric is stretched under a tension of between 5 and 25 Newtons,
  • the metal fabric is fixed, using fixing means, on all or part of the periphery of at least one surface of the support,
  • the stretched metal fabric comprises square meshes whose warp distance "w" and/or weft distance "w'" is between 120 and 220 µm.

La présente invention porte aussi sur un vitrage comprenant au moins un panneau selon l'invention.The present invention also relates to glazing comprising at least one panel according to the invention.

La présente invention porte, de plus, sur des moyens d'obturation d'une enceinte de traitement thermique comprenant le vitrage selon l'invention, et un cadre, fixé sur et/ou entourant le vitrage, le cadre étant en contact électrique avec le tissu métallique et comprenant, ou coopérant avec, des moyens formant charnière permettant l'obturation de l'enceinte de traitement thermique.The present invention further relates to means for closing a heat treatment enclosure comprising the glazing according to the invention, and a frame, fixed on and/or surrounding the glazing, the frame being in electrical contact with the metal fabric and comprising, or cooperating with, means forming a hinge allowing the closing of the heat treatment enclosure.

La présente invention porte, en outre, sur un dispositif de traitement thermique utilisant des micro-ondes comprenant une enceinte de traitement thermique et les moyens d'obturation selon l'invention.The present invention further relates to a heat treatment device using microwaves comprising a heat treatment enclosure and the shutter means according to the invention.

La présente invention porte aussi sur une méthode de réalisation d'un panneau selon l'invention, comprenant les étapes de prendre un support rigide sensiblement transparent au rayonnement dans le domaine du visible, et comprenant au moins une surface, une périphérie, et un ou plusieurs bords, de prendre un tissu métallique dans un état de « repos », le tendre pour le faire passer de l'état de « repos » à un état « étiré », et le maintenir tendu, de fixer, à l'aide de moyens de fixation, le tissu métallique, maintenu tendu et sous forme contraint, sur tout ou partie de la au moins une surface, de façon à le maintenir tendu sur la surface.The present invention also relates to a method of producing a panel according to the invention, comprising the steps of taking a rigid support substantially transparent to radiation in the visible range, and comprising at least one surface, a periphery, and one or several edges, to take a metal fabric in a "rest" state, to stretch it to move it from the "rest" state to a "stretched" state, and to keep it taut, to fix, using fixing means, the metal fabric, held taut and in constrained form, on all or part of the at least one surface, so as to keep it stretched on the surface.

Selon des modes préférés de l'invention, la méthode de réalisation du panneau selon l'invention comprend au moins une, ou une combinaison quelconque appropriée, des caractéristiques suivantes :

  • l'étape de tendre le tissu métallique se fait dans la direction de trame et/ou de chaine, l'étirement du tissu métallique étant compris entre 0,01 à 5% par rapport à un état de « repos »,
  • la méthode comprend en outre une étape de fixer, sur le tissu métallique, un ou plusieurs éléments séparateurs délimitant une pluralité de zones de tissu métallique étiré, et une étape de découpage du tissu métallique étiré, le long des séparateurs.
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 step of stretching the metal fabric is done in the weft and/or warp direction, the stretching of the metal fabric being between 0.01 to 5% compared to a “rest” state,
  • the method further comprises a step of fixing, on the metal fabric, one or more separator elements delimiting a plurality of zones of stretched metal fabric, and a step of cutting the stretched metal fabric, along the separators.

La présente invention porte également sur une méthode de réalisation d'un vitrage selon l'invention, comprenant les étapes de prendre un panneau, réalisé en mettant en oeuvre la méthode de réalisation du panneau selon l'invention, de prendre ou réaliser un ou plusieurs revêtements, de prendre ou réaliser une ou plusieurs plaques de même nature et/ou caractéristiques et/ou dimension que celle(s) du support, de recouvrir tout ou partie du tissu métallique ou tout ou partie de la ou des surfaces du support non recouverte(s) par le tissu métallique, ou les deux à la fois, avec le ou les revêtements, avec la ou les plaques, ou, à la fois, avec un ou plusieurs revêtements et une ou plusieurs plaques, le ou les revêtements étant disposés adjacents ou superposés les uns par rapport aux autres, la ou les plaques étant disposées adjacentes ou superposées les unes par rapport aux autres, ou le ou les revêtements étant disposés adjacents ou superposées à la ou les plaques, le ou les revêtements étant disposés sur la ou les plaques, ou inversement, la ou les plaques étant disposées sur le ou les revêtements.The present invention also relates to a method of producing glazing according to the invention, comprising the steps of taking a panel, produced by implementing the method of producing the panel according to the invention, of taking or producing one or more coverings, to take or make one or more plates of the same nature and/or characteristics and/or dimension as that(s) of the support, to cover all or part of the metal fabric or all or part of the surface(s) of the support not covered by the metal fabric, or both at the same time, with the covering(s), with the plate(s), or, at the same time, with one or more coverings and one or more plates, the covering(s) being arranged adjacent or superimposed with respect to each other, the plate(s) being arranged adjacent or superimposed with respect to each other, or the covering(s) being arranged adjacent to or superimposed on the plate(s), the covering(s) being arranged on the plate(s), or vice versa, the plate(s) being arranged on the covering(s).

La présente invention porte, de plus, sur une méthode de réalisation de moyens d'obturation, d'une enceinte de traitement thermique, selon l'invention, comprenant les étapes de prendre un vitrage, réalisé en mettant en oeuvre la méthode de réalisation d'un vitrage selon l'invention, prendre un cadre, le fixer sur le vitrage, au niveau des, ou sur les, moyens de fixation du tissus métallique sur le support et/ou sur un ou plusieurs bords du support afin que le cadre soit en contact électrique avec le tissu métallique.The present invention furthermore relates to a method of producing shutter means, of a heat treatment enclosure, according to the invention, comprising the steps of taking a glazing, produced by implementing the method of producing glazing according to the invention, take a frame, fix it on the glazing, at the level of, or on the, means of fixing the metal fabric on the support and/or on one or more edges of the support so that the frame is in electrical contact with the metal fabric.

La présente invention porte aussi sur une méthode de réalisation d'un dispositif de traitement thermique utilisant des micro-ondes comprenant les étapes de prendre une enceinte de cuisson, de prendre les moyens d'obturation, réalisés en mettant en oeuvre la méthode de réalisation des moyens d'obturation selon l'invention, et de connecter les moyens d'obturation à l'enceinte.The present invention also relates to a method of producing a heat treatment device using microwaves comprising the steps of taking a cooking chamber, of taking the shutter means, produced by implementing the method of producing the shutter means according to the invention, and to connect the shutter means to the enclosure.

Brève description des figuresBrief description of the figures

  • La figure 1 est une représentation schématique d'une vue de coté d'un panneau selon l'invention.There figure 1 is a schematic representation of a side view of a panel according to the invention.
  • La figure 2 est une représentation schématique d'une vue de dessus d'un mode de réalisation particulier du tissu métallique, sous forme étiré, selon l'invention.There figure 2 is a schematic representation of a top view of a particular embodiment of the metal fabric, in stretched form, according to the invention.
Description détaillée de l'inventionDetailed description of the invention

Dans la suite de la description et des revendications, le terme « longueur » est utilisé pour décrire la plus grande des mesures d'un coté d'une forme géométrique quelconque, par exemple le grand rayon d'un ellipsoïde ou d'une ellipse, la base ou la hauteur d'un triangle, la longueur d'un trapézoïde ou d'un rectangle. Le terme « largeur » est utilisé pour décrire la plus petite des mesures, par exemple le petit rayon d'un ellipsoïde ou d'une ellipse, la base ou la hauteur d'un triangle, la largeur d'un trapézoïde ou d'un rectangle, et les termes « longueur » et « largeur » peuvent être utilisés indifféremment, par exemple pour désigner la mesure du rayon d'un disque, le coté d'un carré.In the remainder of the description and the claims, the term "length" is used to describe the largest of the measurements on one side of any geometric shape, for example the major radius of an ellipsoid or a ellipse, the base or height of a triangle, the length of a trapezoid or 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.

Les termes « avant », « arrière », « supérieur » et « inférieur » font référence à la position normale du panneau selon l'invention, et de ses éléments constitutifs, telle que représentée à la figure 1.The terms “front”, “rear”, “upper” and “lower” refer to the normal position of the panel according to the invention, and of its constituent elements, as represented in the figure 1 .

Le panneau 1 selon l'invention comprend un support 2, qui est rigide, sensiblement inflexible. Il présente une résistance mécanique, à des sollicitations de flexion et/ou de torsion, suffisante pour ne pas se déformer sous l'action d'une force de flexion et/ou de torsion.The panel 1 according to the invention comprises a support 2, which is rigid and substantially inflexible. It has sufficient mechanical resistance to bending and/or twisting stresses so as not to deform under the action of a bending and/or twisting force.

Le support 2 a une forme, une épaisseur et des dimensions adéquates et adaptées, ou compatibles, avec l'utilisation finale du panneau 1, ou des éléments qui comprennent un tel panneau 1.The support 2 has a shape, thickness and dimensions adequate and adapted, or compatible, with the final use of the panel 1, or of the elements which comprise such a panel 1.

Le support 2 comprend au moins une surface 3 supérieure, continue et sensiblement plane, de préférence également une surface 4 inférieure, continue et sensiblement plane, opposée à la surface 3 supérieure (figure 1).The support 2 comprises at least one upper surface 3, continuous and substantially flat, preferably also a lower surface 4, continuous and substantially flat, opposite the upper surface 3 ( figure 1 ).

De préférence, le support 2 a une section transversale, donc dans le plan formé par la surface 2 ou la surface 3, dans le plan X-Z, de forme circulaire, elliptique, polygonale, trapézoïdale ou bien d'un quadrilatère, avantageusement une section losange, carrée ou rectangulaire. De préférence, le support 2 a une section longitudinale, donc dans le plan X-Y, et/ou une section transversale, donc dans le plan Y-Z, perpendiculaires au plan formé par la surface 2 ou la surface 3, circulaire, elliptique ou polygonale, trapézoïdale ou bien d'un quadrilatère, avantageusement une section carrée ou rectangulaire, d'un trapèze ou d'un trapèze rectangle.Preferably, the support 2 has a cross section, therefore in the plane formed by the surface 2 or the surface 3, in the X-Z plane, of circular, elliptical, polygonal, trapezoidal or even a quadrilateral shape, advantageously a diamond section , square or rectangular. Preferably, the support 2 has a longitudinal section, therefore in the X-Y plane, and/or a transverse section, therefore in the Y-Z plane, perpendicular to the plane formed by the surface 2 or the surface 3, circular, elliptical or polygonal, trapezoidal or a quadrilateral, advantageously a square or rectangular section, a trapezoid or a right-angled trapezoid.

Le support 2 comprend au moins un premier bord latéral 8, et dans les modes de réalisation dans lesquels il a une section transversale et/ou longitudinal parallélépipédique, par exemple carrée(s) ou rectangulaire(s), il comprend un second bord latéral 9, opposé au premier bord latéral 8, un bord avant 10 et un bord arrière 11, opposé au bord avant 10.The support 2 comprises at least a first lateral edge 8, and in the embodiments in which it has a parallelepiped transverse and/or longitudinal section, for example square(s) or rectangular(s), it comprises a second lateral edge 9 , opposite the first side edge 8, a front edge 10 and a rear edge 11, opposite the front edge 10.

Le support 2 est fait d'un matériau inerte, de préférence au moins inerte thermiquement, avantageusement également inerte physiquement et chimiquement au(x) matériau(x) dont l'une ou les deux de ces surfaces 2 et 3 est/sont recouverte(s) ou en contact.The support 2 is made of an inert material, preferably at least thermally inert, advantageously also physically and chemically inert to the material(s) with which one or both of these surfaces 2 and 3 is/are covered ( s) or in contact.

Le support 2 est de préférence transparent, ou bien partiellement transparent, optiquement dans le domaine du visible, dans son épaisseur et/ou sa largeur et/ou sa longueur. Il peut être sablé et/ou sérigraphié et/ou coloré sur une partie de l'une ou des deux surfaces 3 et 4.The support 2 is preferably transparent, or partially transparent, optically in the visible range, 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.

De préférence, le support 2 est fait de, ou comprend du plastique, du verre, une matière cristalline ou semi-cristalline, une céramique ou une vitrocéramique.Preferably, the support 2 is made of, or comprises plastic, glass, a crystalline or semi-crystalline material, a ceramic or a glass-ceramic.

Dans un mode de réalisation préféré de l'invention, le support 2 est du verre, de préférence, un verre sodocalcique transparent ou teinté dans la masse, éventuellement à couches diverses, telles que anti-bactériennes, antiréfléchissantes, par exemple du type connu sous la marque Matelux®, chromées, à faible émissivité, par exemple du type connu sous le nom de Planibel Clear ou de Planibel low-E IsoComfort, commercialisé par la société AGC, ou un borosilicate par exemple connu sous la marque Borofloat® 33. De préférence, le verre est à forte teneur en SiO2, une teneur avantageusement comprise entre 69 % et 81 % en poids et avec une transmission lumineuse pouvant aller jusqu'à 90 %. Le verre peut avoir éventuellement préalablement subi un traitement thermique du type durcissement, recuit, trempe, bombage.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 anti-bacterial, anti-reflective, for example of the type known as the Matelux ® brand, chrome-plated, low-emissivity, for example of the type known under the name of 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 SiO 2 content, a content advantageously between 69% and 81% by weight and with a light transmission of up to 90%. The glass may possibly have previously undergone heat treatment such as hardening, annealing, quenching, bending.

Le panneau 1 selon l'invention comprend des moyens de blindage anti microondes comprenant un tissu métallique 5, fixé sur tout ou partie d'une des surfaces 3 ou 4, de préférence sur les deux surfaces 3 et 4 du support 2, le tissu métallique 5 étant sous forme contraint. Le tissu métallique 5 est tendu sur la ou les surfaces 3, 4. Il est sous une forme étirée entre les bords 8, 9, 10, 11 du support 2.The panel 1 according to the invention comprises anti-microwave shielding means comprising a metal fabric 5, fixed on all or part of one of the surfaces 3 or 4, preferably on the two surfaces 3 and 4 of the support 2, the metal fabric 5 being in constrained form. The metal fabric 5 is stretched over the surface(s) 3, 4. It is in a stretched form between the edges 8, 9, 10, 11 of the support 2.

Contrairement aux solutions de l'état de la technique dans lesquelles les treillis métalliques ou les tissus métalliques, utilisés comme blindage anti microondes, sont disposés sur un support dans un état de « repos », à savoir non contraint ou non tendu, dans la présente invention, le tissu métallique 5 se trouve sous une forme allongée sur le support 2. Il subit, sur le support 2, l'action d'une ou plusieurs forces de tractions, en continu, alors même qu'il recouvre la ou les surfaces 3, 4.Unlike the solutions of the state of the art in which the metal meshes or metal fabrics, used as anti-microwave shielding, are arranged on a support in a "rest" state, namely not constrained or not stretched, in the present invention, the metal fabric 5 is in an elongated form on the support 2. It undergoes, on the support 2, the action of one or several traction forces, continuously, even as it covers the surface(s) 3, 4.

Eventuellement, le tissu métallique 5 peut dépasser d'un ou des bords 8 du support 2, et également le ou les recouvrir, néanmoins de préférence sous forme non tendu, donc à l'état de repos.Optionally, the metal fabric 5 can protrude from one or more edges 8 of the support 2, and also cover it or them, nevertheless preferably in unstretched form, therefore in the rest state.

Ainsi, le panneau 1 selon l'invention possède des propriétés barrières, ou de réflexion des micro-ondes, préservées ou améliorées, tout en procurant une transparence optique dans le domaine du visible, améliorée.Thus, the panel 1 according to the invention has barrier properties, or microwave reflection properties, preserved or improved, while providing improved optical transparency in the visible range.

Le tissu métallique 5 selon l'invention est déformable, en particulier il est extensible élastiquement. Il présente une capacité d'étirement adéquate lui permettant de passer de son état de « repos », alors qu'il n'est pas installé sur le support 2, à son état « étiré » une fois qu'il recouvre la ou les surfaces 3, 4. Il possède également des propriétés d'élasticité lui permettant de reprendre, au moins partiellement, sa forme et sa dimension, après les avoir perdus par extension. Par conséquent, de par son élasticité, le tissu métallique 5 se trouve tendu sur le support 2, et subit, au sein du panneau 1, des forces de tension créées par la tendance du tissu métallique 5 de revenir à son état de repos.The metal fabric 5 according to the invention is deformable, in particular it is elastically extensible. It has an adequate stretching capacity allowing it to move from its “rest” state, while it is not installed on the support 2, to its “stretched” state once it covers the surface(s). 3, 4. It also has elastic properties allowing it to regain, at least partially, its shape and size, after having lost them by extension. Consequently, due to its elasticity, the metal fabric 5 is stretched on the support 2, and undergoes, within the panel 1, tension forces created by the tendency of the metal fabric 5 to return to its resting state.

De préférence, il possède un module de Young compris entre 190 et 230 GPa.Preferably, it has a Young's modulus of between 190 and 230 GPa.

De préférence, il est obtenu par tissage de fils ou de fibres métalliques ou recouverts de métal, des fibres faits ou comprenant, un ou plusieurs métaux, ou un ou plusieurs alliages de métaux adéquats, avantageusement choisis parmi l'argent, le chrome, le platine, le cuivre, l'acier inoxydable, leur alliages ou un mélange de ceux-ci.Preferably, it is obtained by weaving metallic or metal-covered threads or fibers, fibers made of or comprising one or more metals, or one or more suitable metal alloys, advantageously chosen from silver, chromium, platinum, copper, stainless steel, their alloys or a mixture thereof.

Les fibres métalliques ont un diamètre en chaine « d », et d'un diamètre en trame « d' », « d » et « d' » pouvant être identiques ou différents entre trame et chaine, espacés en chaine d'une distance « w » et en trame d'une distance « w' », « w » et « w' » pouvant être identiques ou différents entre trame et chaine.The metal fibers have a warp diameter "d", and a weft diameter "d", "d" and "d" which may be identical or different between weft and warp, spaced in chain by a distance " w" and in weft with a distance "w'", "w" and "w'" which may be identical or different between weft and warp.

Les fibres métalliques peuvent s'entrecroisés selon toutes les armures adéquates, par exemple selon une armure toile, sergé ou satin.The metal fibers can be interwoven in any suitable weave, for example in a plain, twill or satin weave.

De préférence, dans le panneau 1, le tissu métallique 5 est étiré de 0,01 à 5% par rapport à son état de repos. La tension exercée sur le tissu métallique 5, pour de tels étirements, est également fonction de la nature des fils composants le tissu métallique 5, de leur capacité d'étirement et de leur élasticité, et donc de la capacité d'étirement et l'élasticité générale du tissu métallique 5.Preferably, in panel 1, the metal fabric 5 is stretched by 0.01 to 5% relative to its rest state. The tension exerted on the metal fabric 5, for such stretching, is also a function of the nature of the threads making up the metallic fabric 5, of their stretching capacity and their elasticity, and therefore of the stretching capacity and the general elasticity of the metallic fabric 5.

De préférence, il est tendu dans au moins une direction, avantageusement dans toutes les directions, à savoir, pour un tissu métallique 5 de forme sensiblement carrée ou rectangulaire, selon sa largeur ou trame (plan Z-Z' de la figure 1), sa longueur ou chaine (plan X-X' de la figure 1), mais de préférence pas dans son épaisseur (plan Y-Y' de la figure 1). Comme il peut adopter des formes identiques ou compatibles avec celles du panneau 1, le tissu métallique 5 est étiré, et maintenu tendu sur la ou les surfaces 3, 4 du support 2, dans toutes les directions de sa largeur et de sa longueur, quelque soit sa forme.Preferably, it is stretched in at least one direction, advantageously in all directions, namely, for a metal fabric 5 of substantially square or rectangular shape, depending on its width or frame (plane ZZ' of the figure 1 ), its length or chain (plan XX' of the figure 1 ), but preferably not in its thickness (plane YY' of the figure 1 ). As it can adopt shapes identical or compatible with those of the panel 1, the metal fabric 5 is stretched, and held taut on the surface(s) 3, 4 of the support 2, in all directions of its width and its length, whatever or its shape.

Il est possible de prévoir que le tissu métallique 5 soit tendu différemment sur sa surface 3, 4, donc dans le plan qu'il forme, le plan X-Z, par exemple selon un premier niveau d'étirement pour une ou plusieurs portions de sa périphérie, avec une portion centrale non étirée ou étirée selon un second niveau d'étirement, inférieur au premier niveau d'étirement. Toutefois, et de préférence, il est étiré de façon homogène sur toute sa surface de sa portion centrale à sa périphérie.It is possible to provide for the metal fabric 5 to be stretched differently on its surface 3, 4, therefore in the plane it forms, the X-Z plane, for example according to a first level of stretching for one or more portions of its periphery , with a central portion not stretched or stretched according to a second stretching level, lower than the first stretching level. However, and preferably, it is stretched homogeneously over its entire surface from its central portion to its periphery.

La forme des jours, ou mailles, du tissu métallique 5 étiré dans le panneau 1, et leurs tailles ou dimensions « w » et « w' », sous forme tendue, est choisie en fonction du type de micro-ondes à absorber ou à réfléchir. De préférence, le tissu métallique 5 a la même forme de maille dans son état étiré que dans son état de repos. Toutefois, il est possible d'envisager que la maille soit déformée entre ces deux états, une déformation obtenue par une différence d'étirement sur sa largeur et/ou sa longueur.The shape of the days, or meshes, of the metal fabric 5 stretched in the panel 1, and their sizes or dimensions "w" and "w'", in stretched form, is chosen depending on the type of microwave to be absorbed or to reflect on. Preferably, the metal fabric 5 has the same mesh shape in its stretched state as in its rest state. However, it is possible to envisage that the mesh is deformed between these two states, a deformation obtained by a difference in stretching over its width and/or its length.

De préférence, les mailles sont étirées entre 50 et 100%, c'est-à-dire que les mailles ont des dimensions « w » et/ou « w' » qui sont une fois et demi ou deux fois celles du tissu métallique 5 au repos.Preferably, the meshes are stretched between 50 and 100%, that is to say the meshes have dimensions "w" and/or "w'" which are one and a half or two times those of the metal fabric 5 at rest.

La maille étirée peut être une maille rectangulaire ou losangée, mais elle est de préférence carrée, car une telle maille permet d'obtenir une transparence du panneau 1, et donc du dispositif que le comprend, la plus esthétique et la plus uniforme.The stretched mesh can be a rectangular or diamond mesh, but it is preferably square, because such a mesh makes it possible to obtain the most aesthetic and uniform transparency of the panel 1, and therefore of the device that includes it.

De préférence, le tissu métallique 5 au repos comprend des mailles carrées de dimension dimensions « w » et « w' » comprises entre 60 à 100 µm. De préférence, les fibres métalliques sont en acier inoxydable d'un diamètre « d » et « d' » identique, compris entre 200 et 300 µm. De préférence, le pourcentage de jour varie de 35 à 50% et ayant une finesse comprise entre 30 et 120 mesh/pouce, à savoir entre 30 et 120 mailles par 25,4 mm. Etiré, le tissu métallique 5 comprend des mailles carrées (figure 2), dont les dimensions « w » et « w' » sont comprises entre 120 à 220 µm. De préférence, les fibres métalliques ont un diamètre « d » et « d' » identique, compris entre 50 et 100 µm.Preferably, the metallic fabric 5 at rest comprises square meshes with dimensions “w” and “w'” of between 60 to 100 µm. Preferably, the metal fibers are made of stainless steel with an identical diameter "d" and "d'", of between 200 and 300 µm. Preferably, the percentage of daylight varies from 35 to 50% and having a fineness of between 30 and 120 mesh/inch, namely between 30 and 120 mesh per 25.4 mm. Stretched, the metallic fabric 5 comprises square meshes ( figure 2 ), whose dimensions “w” and “w'” are between 120 to 220 µm. Preferably, the metal fibers have an identical diameter "d" and "d'", of between 50 and 100 µm.

De préférence, la tension exercée sur le tissu métallique 5 pour l'étirer, et le maintenir tendu sur le support 2, est de 5 à 25 Newtons.Preferably, the tension exerted on the metal fabric 5 to stretch it, and keep it taut on the support 2, is 5 to 25 Newtons.

A titre d'exemple, le tissu métallique 5 selon l'invention a une finesse d'environ 43 mesh/pouce (43 mailles par 25,4mm), avec 46% de jours, et comprenant des mailles carrées d'une dimension « d » en chaine et « d' » en trame d'environ 160 µm, formées par des fils d'acier inoxydable ayant un diamètre « w » en chaine et « w' » en trame d'environ 70 µm.By way of example, the metal fabric 5 according to the invention has a fineness of approximately 43 mesh/inch (43 meshes per 25.4mm), with 46% days, and comprising square meshes of a dimension "d » in warp and “d'” in weft of approximately 160 µm, formed by stainless steel wires having a diameter “w” in warp and “w'” in weft of approximately 70 µm.

Le tissu métallique 5, sous une forme tendue, est fixé, de façon continue ou discontinue, sur la ou les surfaces 3, 4, à l'aide de moyens de fixation 6, un adhésif, ou une colle, compatible avec la nature du tissus métallique 5, du support 2, du dispositif final intégrant le panneau 1 selon l'invention et de son utilisation finale. De préférence, il s'agit d'une colle ayant une bonne tenue lorsqu'il est soumis à de hautes températures, d'environ 250°C. Il peut s'agir d'une colle silicone mono composante, une colle silicone base acétique ou base neutre.The metal fabric 5, in a stretched form, is fixed, continuously or discontinuously, on the surface(s) 3, 4, using fixing means 6, an adhesive, or a glue, compatible with the nature of the metal fabrics 5, the support 2, the final device integrating the panel 1 according to the invention and its final use. Preferably, it is an adhesive having good resistance when subjected to high temperatures, around 250°C. It can be a single-component silicone glue, an acetic-based silicone glue or a neutral-based silicone glue.

Le tissu métallique 5 est fixé, de préférence, sur tout ou partie de la périphérie 7 d'une des surfaces 3 ou 4 (figure 1), de préférence à quelques millimètres, par exemple 5 à 25 mm, du bords 8 du support 2, éventuellement également sur un ou plusieurs bords 8. Cela présente l'avantage de rendre invisible les points ou zones de collage du tissu métallique 5 dans le dispositif final intégrant le panneau 1 selon l'invention.The metal fabric 5 is fixed, preferably, on all or part of the periphery 7 of one of the surfaces 3 or 4 ( figure 1 ), preferably a few millimeters, for example 5 to 25 mm, from the edges 8 of the support 2, possibly also on one or more edges 8. This has the advantage of making invisible the points or areas of bonding of the metal fabric 5 in the final device integrating the panel 1 according to the invention.

Le panneau 1 selon l'invention est utilisé, de préférence, dans le domaine des appareils électroménagers, avantageusement comme vitrage d'un appareil électroménager domestiques ou professionnels, encore plus avantageusement comme vitrage d'une porte d'un four micro-ondes ou mixte.The panel 1 according to the invention is used, preferably, in the field of household appliances, advantageously as glazing of an appliance domestic or professional household appliances, even more advantageously as glazing of a door of a microwave or combination oven.

Le vitrage selon l'invention comprend le panneau 1 selon l'invention, Il peut comprendre en outre un ou plusieurs revêtements, ou films, superposés ou disposés adjacents les uns par rapport aux autres, recouvrant tout ou partie du tissu métallique 5 et/ou de la ou des surfaces 2, 3, ou portions des surfaces 2, 3 du support 2, non recouverte(s) du tissu métallique 5, de préférence à l'exception du tissu métallique 5 dépassant du ou des bords 8 du support 2.The glazing according to the invention comprises the panel 1 according to the invention. It may further comprise one or more coatings, or films, superimposed or arranged adjacent to each other, covering all or part of the metal fabric 5 and/or of the surface(s) 2, 3, or portions of the surfaces 2, 3 of the support 2, not covered with the metal fabric 5, preferably with the exception of the metal fabric 5 protruding from the edge(s) 8 of the support 2.

Les revêtements ou films ont des dimensions et des épaisseurs adéquates et de préférence des propriétés particulières, qui sont avantageusement fonction de l'utilisation finale du vitrage ou du dispositif ou des moyens comprenant le vitrage. Il peut s'agir d'un revêtement de protection, de préférence de protection thermique, et/ou d'anti-condensation.The coatings or films have adequate dimensions and thicknesses and preferably particular properties, which advantageously depend on the final use of the glazing or the device or means comprising the glazing. It may be a protective coating, preferably thermal protection, and/or anti-condensation.

Le panneau 1 peut comprendre en outre une plaque, ou feuille, transparente, de même nature, mêmes caractéristiques et dimensions que celles formant le support 2, disposé sur le tissu métallique 5, sur le ou les revêtements recouvrant le tissu métallique 5 et/ou sur la ou les surfaces 3, 4 du support 2.The panel 1 may further comprise a transparent plate, or sheet, of the same nature, same characteristics and dimensions as those forming the support 2, placed on the metal fabric 5, on the coating(s) covering the metal fabric 5 and/or on the surface(s) 3, 4 of the support 2.

Ainsi, si le tissu métallique 5 recouvre une seule des surfaces 3 ou 4 du support 2, l'autre surface peut être recouverte par un ou plusieurs revêtements disposés adjacents ou superposés les uns par rapport aux autres ou bien par une ou plusieurs plaques disposées adjacentes ou superposées les unes par rapport aux autres, ou bien par, à la fois, un ou plusieurs revêtements et une ou plusieurs plaques, la ou les plaques étant disposée(s) de façon adjacente(s) ou superposée(s) par rapport au(x) revêtement(s) ou le ou les revêtements recouvrant la ou les plaques.Thus, if the metal fabric 5 covers only one of the surfaces 3 or 4 of the support 2, the other surface can be covered by one or more coverings arranged adjacent or superimposed on each other or by one or more plates arranged adjacent or superimposed on each other, or by both one or more coverings and one or more plates, the plate(s) being arranged adjacently or superimposed on the (x) coating(s) or coating(s) covering the plate(s).

Si le tissu métallique 5 recouvre totalement une ou les deux surfaces 3, 4 à la fois, un premier ou une première série de revêtements, ou une ou une première série de plaques, peuvent recouvrir la totalité du tissu métallique 5, le ou les revêtements pouvant pénétrer les mailles du tissu métallique 5, un second ou une seconde série de revêtements, ou une ou seconde série de plaques, pouvant alors recouvrir le premier ou première série de revêtements ou la première ou première série de plaques. Ainsi, le vitrage peut être un produit multicouche, comprenant soit une alternance de revêtements et de plaques, soit un ou plusieurs revêtements sur une ou plusieurs plaques, ou inversement, une ou plusieurs plaques sur un ou plusieurs revêtements.If the metal fabric 5 completely covers one or both surfaces 3, 4 at the same time, a first or a first series of coatings, or one or a first series of plates, can cover the entire metal fabric 5, the coating(s) capable of penetrating the mesh of the metal fabric 5, a second or second series of coatings, or one or second series of plates, which can then cover the first or first series of coatings or the first or first series of plates. Thus, the glazing can be a multi-layer product, comprising either a alternation of coverings and plates, i.e. one or more coverings on one or more plates, or conversely, one or more plates on one or more coverings.

Si le tissu métallique 5 recouvre partiellement l'une ou les deux surfaces 3, 4 à la fois, le ou les revêtements ou la ou les plaques peuvent recouvrir soit le tissu métallique 5 soit la surface 3 et/ou 4 ne comprenant pas de tissu métallique 5, ou les deux à la fois. Si un premier ou une première série de revêtements, ou une première ou une première série de plaques, ne recouvrent qu'une partie du tissu métallique 5, un second ou une seconde série de revêtements, ou une ou seconde série de plaques peuvent recouvrir le reste du tissu métallique 5, et éventuellement également le premier ou première série de revêtements ou première ou première série de plaques. Il est également possible de prévoir qu'un troisième ou une troisième série de revêtements, ou une ou troisième série de plaques, recouvrent tout ou partie de la première série et/ou seconde série de revêtements et/ou de plaques.If the metal fabric 5 partially covers one or both surfaces 3, 4 at the same time, the coating(s) or plate(s) can cover either the metal fabric 5 or the surface 3 and/or 4 not comprising fabric metallic 5, or both at the same time. If a first or a first series of coatings, or a first or a first series of plates, only cover part of the metal fabric 5, a second or a second series of coatings, or one or second series of plates can cover the remainder of the metal fabric 5, and possibly also the first or first series of coverings or first or first series of plates. It is also possible to provide that a third or third series of coverings, or one or third series of plates, cover all or part of the first series and/or second series of coverings and/or plates.

Le panneau 1 selon l'invention est utilisé, de préférence, comme moyens d'obturation d'une enceinte de traitement thermique, par exemple comme porte d'un four micro-ondes ou mixte.The panel 1 according to the invention is preferably used as means of closing a heat treatment enclosure, for example as the door of a microwave or mixed oven.

Les moyens d'obturation selon l'invention comprennent le vitrage selon l'invention et un cadre, monobloc ou être fait d'un assemblage d'éléments de cadre, fixé sur, ou entourant le vitrage, et comprenant, ou coopérant avec, des moyens formant charnière permettant l'obturation de l'enceinte de traitement thermique. Le cadre a toutes les formes et dimensions adaptées à l'enceinte qu'il doit obturer, au vitrage et au panneau 1 selon l'invention.The shutter means according to the invention comprise the glazing according to the invention and a frame, in one piece or made from an assembly of frame elements, fixed on, or surrounding the glazing, and comprising, or cooperating with, means forming a hinge allowing the closing of the heat treatment enclosure. The frame has 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.

De préférence, le cadre est positionné au niveau, de préférence, recouvre les moyens de fixation 6 du tissus métallique 5 sur le support 2, donc la périphérie 7 d'une des surfaces 3 ou 4 du support 2, ce qui présente l'avantage de rendre les moyens de fixation 6 invisibles. Le cadre peut également recouvrir un ou plusieurs bords du vitrage et donc un ou plusieurs bords 8 du panneau 1, comprenant éventuellement la ou les portions du tissus métallique 5 dépassant du support 2.Preferably, the frame is positioned at the level, preferably, covers the fixing means 6 of the metal fabric 5 on the support 2, therefore the periphery 7 of one of the surfaces 3 or 4 of the support 2, which has the advantage to make the fixing means 6 invisible. The frame can also cover one or more edges of the glazing and therefore one or more edges 8 of the panel 1, possibly including the portion(s) of the metal fabric 5 protruding from the support 2.

Le cadre est fait, ou comprend, tous matériaux adéquats, compatibles avec son utilisation finale, en particulier avec son utilisation comme porte de fours.The frame is made of, or includes, all suitable materials, compatible with its end use, in particular with its use as an oven door.

De préférence, le cadre est en contact électrique avec le tissu métallique 5, au moins avec sa portion recouvrant la ou les surface 3, 4 et/ou celle dépassant ou recouvrant un ou plusieurs bords 8 du support 2. Ce contact électrique présente l'avantage de dissiper le rayonnement micro-ondes.Preferably, the frame is in electrical contact with the metal fabric 5, at least with its portion covering the surface(s) 3, 4 and/or that extending beyond or covering one or more edges 8 of the support 2. This electrical contact has the advantage of dissipating microwave radiation.

Le dispositif de traitement thermique selon l'invention comprend une enceinte de cuisson et les moyens d'obturation selon l'invention. De préférence, il s'agit d'un four dit micro-ondes ou d'un four mixte.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 combi oven.

La présente invention a également pour objet une méthode de réalisation d'un panneau 1 selon l'invention.The present invention also relates to a method of producing a panel 1 according to the invention.

La méthode comprend l'étape de prendre, ou réaliser, le support 2 et le tissu métallique 5 tel que décrit précédemment.The method includes the step of taking, or making, the support 2 and the metal fabric 5 as described previously.

De préférence, le tissu métallique 5 est posé dans son état de repos sur une table munie de moyens d'étirement, par exemple une table munie de mors sur toute sa périphérie, et le tissu est fixé dans ces moyens d'étirement.Preferably, the metal fabric 5 is placed in its resting state on a table provided with stretching means, for example a table provided with jaws over its entire periphery, and the fabric is fixed in these stretching means.

Le tissu métallique 5 est allongé dans au moins une direction, de préférence dans toutes les directions, à savoir sur sa longueur et/ou sa largeur, et maintenu dans un état étiré, de préférence de 0,01 à 5% par rapport à son état de repos.The metal fabric 5 is elongated in at least one direction, preferably in all directions, namely along its length and/or its width, and maintained in a stretched state, preferably by 0.01 to 5% relative to its state of rest.

De préférence, l'étirement du tissu métallique 5 est obtenu en appliquant une force comprise entre 5 et 25 Newtons.Preferably, the stretching of the metal fabric 5 is obtained by applying a force of between 5 and 25 Newtons.

La méthode peut comprendre en outre la fixation sur le tissu métallique 5 d'un ou plusieurs éléments séparateurs, permettant de délimiter au moins une, de préférence plusieurs zones de tissu métallique 5 tendu, et son découpage le long du ou des séparateurs. Cela présente l'avantage de disposer de portions de tissu métallique 5 tendu et donc de faciliter leur manipulation pour la mise en œuvre des autres étapes du procédé.The method may further comprise the fixing on the metal fabric 5 of one or more separator elements, making it possible to delimit at least one, preferably several zones of stretched metal fabric 5, and its cutting along the separator(s). This has the advantage of having portions of stretched metal fabric 5 and therefore of facilitating their handling for the implementation of the other stages of the process.

La taille et les dimensions du ou des séparateurs sont fonctions de celles du support 2 et donc celles du panneau 1.The size and dimensions of the separator(s) depend on those of the support 2 and therefore those of the panel 1.

La méthode comprend l'étape de prendre, ou réaliser, un support 2 tel que décrit précédemment, de déposer des moyens de fixation 6, sur tout ou partie de la périphérie 7 d'une des surfaces 3 ou 4, de préférence à quelques millimètres du bords 8 du support 2, éventuellement également sur un ou plusieurs des bords 8 9, 10, 11. De préférence, l'application des moyens de fixation 6 met en oeuvre un pistolet pneumatique, ce qui présente l'avantage de gagner en précision et d'obtenir une meilleur homogénéité des moyens de fixation 6 sur la ou les surfaces 3, 4.The method comprises the step of taking, or making, a support 2 as described above, of depositing fixing means 6, on all or part of the periphery 7 of one of the surfaces 3 or 4, preferably a few millimeters away of the edges 8 of the support 2, possibly also on one or more of the edges 8 9, 10, 11. Preferably, the application of the fixing means 6 implements a pneumatic gun, which has the advantage of gaining precision and obtaining better homogeneity of the fixing means 6 on the surface(s) 3, 4.

Le tissu métallique 5 tendu, ou une portion de ce dernier, munie de son ou de ces éléments séparateurs, est mis(e) en contact avec le support 2 muni des moyens de fixation 6. De préférence, c'est le tissu métallique 5 tendu, ou une de ces portions, qui est posé(e) sur le support 2. Avantageusement, une pression est exercée sur le tissu métallique 5, afin que les moyens de fixation 6 pénètrent dans, et de préférence traversent, ces mailles.The stretched metal fabric 5, or a portion of the latter, provided with its separator element(s), is brought into contact with the support 2 provided with the fixing means 6. Preferably, it is the metal fabric 5 stretched, or one of these portions, which is placed on the support 2. Advantageously, pressure is exerted on the metal fabric 5, so that the fixing means 6 penetrate into, and preferably pass through, these meshes.

La méthode comprend en outre une étape de suppression du ou des éléments séparateurs du tissu métallique 5 tendu.The method further comprises a step of removing the separator element(s) from the stretched metal fabric 5.

La méthode peut comprendre en outre une étape de découpe du tissu métallique 5 dépassant au-delà des bords 8, 9, 10, 11 du support 2, de préférence en laissant une marge par rapport auxdits bords 8, 9, 10, 11, qui est fonction de l'utilisation finale du panneau selon l'invention. Par exemple, pour un vitrage de fours micro-ondes, cette marge sera d'environ de 5 à 25 mm.The method may further comprise a step of cutting the metal fabric 5 projecting beyond the edges 8, 9, 10, 11 of the support 2, preferably leaving a margin with respect to said edges 8, 9, 10, 11, which depends on the final use of the panel according to the invention. For example, for microwave oven glazing, this margin will be approximately 5 to 25 mm.

La méthode de réalisation du vitrage selon l'invention comprend l'étape de prendre, ou réaliser, le panneau 1 selon l'invention, de préférence fabriqué selon la méthode décrite précédemment, une étape de prendre, ou réaliser, un ou plusieurs revêtements, ou films, et/ou une ou plusieurs plaques, ou feuilles, transparentes, de même nature, mêmes caractéristiques et dimensions que celles formant le support 2, une étape de recouvrir tout ou partie du tissu métallique 5 et/ou tout ou partie d'une ou des surfaces 3, 4 du support 2 non recouverte(s) par le tissu métallique (5), à l'aide du ou des revêtements ou d'une ou plusieurs plaques.The method of producing the glazing according to the invention comprises the step of taking, or producing, the panel 1 according to the invention, preferably manufactured according to the method described previously, a step of taking, or producing, one or more coatings, or films, and/or one or more plates, or sheets, transparent, of the same nature, same characteristics and dimensions as those forming the support 2, a step of covering all or part of the metallic fabric 5 and/or all or part of one or more surfaces 3, 4 of the support 2 not covered by the metal fabric (5), using the covering(s) or one or more plates.

Ainsi, si le tissu métallique 5 recouvre qu'une seule des surfaces 3 ou 4 du support 2, il est possible de recouvrir l'autre surface 3 ou 4 d'un ou plusieurs revêtements disposés adjacents ou superposés les uns par rapport aux autres, ou bien par une ou plusieurs plaques disposés adjacentes ou superposées les unes par rapport aux autres, ou bien par, à la fois, un ou plusieurs revêtements et une ou plusieurs plaques, la ou les plaques étant disposée(s) de façon adjacente(s) ou superposée(s) par rapport au(x) revêtement(s), ou le ou les revêtements recouvrant la ou les plaques.Thus, if the metal fabric 5 covers only one of the surfaces 3 or 4 of the support 2, it is possible to cover the other surface 3 or 4 with one or more coverings arranged adjacent or superimposed on each other, or by one or more plates arranged adjacent or superimposed on each other, or by both one or more coverings and one or more plates, the plate(s) being arranged adjacently ) or superimposed on the coating(s), or the coating(s) covering the plate(s).

Si le tissu métallique 5 recouvre totalement une ou les deux surfaces 3, 4 à la fois, il est possible de le recouvrir partiellement ou totalement, de préférence à l'exception du tissu métallique 5 dépassant les bords 8, 9, 10, 11 du support 2, par un premier ou une première série de revêtements, ou une ou une première série de plaques, puis de le ou les recouvrir d'un second ou une seconde série de revêtements, ou une ou plusieurs autres plaques, afin d'obtenir un produit multicouche, comprenant soit une succession de couches de revêtements ou une succession de plaques, soit une alternance de revêtements et de plaques, soit un ou plusieurs revêtements sur une ou plusieurs plaques, ou inversement, une ou plusieurs plaques sur un ou plusieurs revêtements.If the metal fabric 5 completely covers one or both surfaces 3, 4 at the same time, it is possible to cover it partially or completely, preferably with the exception of the metal fabric 5 extending beyond the edges 8, 9, 10, 11 of the support 2, by a first or a first series of coverings, or one or a first series of plates, then to cover it or them with a second or a second series of coverings, or one or more other plates, in order to obtain a multi-layer product, comprising either a succession of layers of coverings or a succession of plates, or an alternation of coverings and plates, or one or more coverings on one or more plates, or conversely, one or more plates on one or more coverings .

Si le tissu métallique 5 recouvre partiellement l'une ou les deux surfaces 3, 4 à la fois, il est possible de le recouvrir et/ou de recouvrir la surfaces 3, 4 non recouverte par le tissu métallique 5, par un ou plusieurs revêtements ou par une ou plusieurs plaques. Si un premier ou une première série de revêtements, ou une première ou une première série de plaques, ne recouvrent qu'une partie du tissu métallique 5, il est possible de recouvrir le reste du tissu métallique 5, et éventuellement également le premier ou première série de revêtements ou première ou première série de plaques, à l'aide d'un second ou une seconde série de revêtements, ou une ou seconde série de plaques. Il est également possible de recouvrir tout ou partie de la première série et/ou seconde série de revêtements et/ou de plaques à l'aide d'un troisième ou une troisième série de revêtements, ou une ou troisième série de plaques.If the metal fabric 5 partially covers one or both surfaces 3, 4 at the same time, it is possible to cover it and/or to cover the surfaces 3, 4 not covered by the metal fabric 5, with one or more coverings or by one or more plates. If a first or a first series of coatings, or a first or a first series of plates, only cover part of the metal fabric 5, it is possible to cover the rest of the metal fabric 5, and possibly also the first or first series of coatings or first or first series of plates, using a second or second series of coatings, or one or second series of plates. It is also possible to cover all or part of the first series and/or second series of coverings and/or plates using a third or third series of coverings, or one or third series of plates.

L'application du ou des revêtements, films, plaques ou feuilles peut se faire par toute méthode adéquate.The application of the coating(s), films, plates or sheets can be done by any suitable method.

La méthode de réalisation de moyens d'obturation d'une enceinte de traitement thermique, en particulier d'une porte d'un four micro-ondes ou mixte, comprend l'étape de prendre ou réaliser un vitrage selon l'invention, de préférence fabriqué selon la méthode décrite précédemment, de prendre ou réaliser un cadre monobloc, ou fait d'un assemblage d'éléments de cadre, et de fixer le cadre sur le vitrage, de préférence au niveau des, ou sur les, moyens de fixation 6 du tissus métallique 5 sur le support 2 et/ou un ou plusieurs bords du vitrage. De préférence, la méthode comprend en outre une étape de prendre, ou réaliser, des moyens formant charnière et de les fixer sur le cadre, avant ou après la pose du cadre sur le vitrage.The method of producing means for closing a heat treatment enclosure, in particular a door of a microwave or mixed oven, comprises the step of taking or producing glazing according to the invention, preferably manufactured according to the method described above, to take or make a one-piece frame, or made of an assembly of frame elements, and to fix the frame on the glazing, preferably at the level of, or on, the fixing means 6 metal fabric 5 on the support 2 and/or one or more edges of the glazing. Preferably, the method further comprises a step of taking, or producing, means forming a hinge and fixing them on the frame, before or after installing the frame on the glazing.

La méthode de réalisation d'un dispositif de traitement thermique comprend l'étape de prendre, ou réaliser une enceinte de cuisson, de préférence hermétique, ou sensiblement hermétique, aux micro-ondes, l'étape de prendre, ou réaliser les moyens d'obturation selon l'invention, de préférence réalisés à l'aide de la méthode décrite précédemment, et une étape de connexion des moyens d'obturation à l'enceinte.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 means of shutter according to the invention, preferably carried out using the method described above, and a step of connecting the shutter means to the enclosure.

Claims (14)

  1. Panel (1) for glazing comprising a rigid support (2), substantially transparent to radiation in the visible range, and comprising at least one surface (3, 4), comprising a periphery (7), and one or a plurality of edges (8, 9, 10, 11), characterized in that said panel (1) comprises a metal fabric (5) stretched over, and attached onto, all or part of, said at least one of said surfaces (3, 4), of said metal fabric (5) being in stressed form.
  2. The panel (1) according to claim 1, wherein the stretched metal fabric (5) comprises a percentage of stretch, along the weft and/or warp direction, comprised between 0.01 and 5% compared to a "rest" state of said metal fabric (5).
  3. The panel (1) according to any of the preceding claims, wherein the metal fabric (5) is tensioned under a tension comprised between 5 and 25 Newtons.
  4. The panel (1) according to any of the preceding claims, wherein the metal fabric (5) is attached with attachment means (6), onto all or part of the periphery (7) of the at least one surface (3, 4) of the support (2).
  5. The panel (1) according to any of the preceding claims, wherein the taut metal fabric (5) comprises square meshes the warp distance "w" and/or weft distance "w‴ being comprised between 120 and 220 km.
  6. Glazing comprising at least one panel (1) according to any of the preceding claims.
  7. Means for closing a heat treatment chamber comprising the glazing according to claim 6, a frame, attached onto and/or surrounding said glazing, said frame being in electrical contact with the metal fabric (5), and comprising, or cooperating with, means forming a hinge closing said heat treatment chamber.
  8. Heat treatment device using microwaves, comprising a heat treatment chamber and the means of closing according to claim 7.
  9. Method for producing a panel (1) according to any of claims 1 to 5, comprising the following steps:
    - taking a rigid support (2), substantially transparent to radiation in the visible range, comprising at least one surface (3, 4), a periphery (7), and one or a plurality of edges (8, 9, 10, 11),
    - taking a metal fabric (5) in a "rest" state, tensioning of same so as to change the fabric from the "rest" state to a "stretched" state, and keep the fabric taut,
    - attaching, with the means of attachment (6), said metal fabric (5), held taut, onto all or part of said at least one surface (3, 4), so as to keep the fabric taut and in a stressed form over said at least one surface (3, 4).
  10. The method according to claim 9, wherein the step of tensioning the metallic fabric (5) is carried out by pulling in the weft and/or warp direction, the stretching of said metallic fabric (5) being comprised between 0.01 and 5% compared to the "rest" state thereof.
  11. The method according to any of claims 9 or 10, further comprising a step of attaching to the metal fabric (5), one or a plurality of separator elements delimiting a plurality of zones of stretched metal fabric (5), and one step of cutting the stretched metal fabric (5) along the separators.
  12. Method for producing a glazing according to claim 6, comprising the steps of:
    - taking a panel (1) produced by carrying out the method according to any of claims 9 to 11,
    - taking or producing one or a plurality of coatings,
    - taking or producing one or a plurality of plates of the same nature and/or features and/or size as the features/size of the support (2),
    - covering all or part of the metallic fabric (5) or all or part of the surface(s) (3, 4) of said support (2) not covered by said metallic fabric (5), or both at the same time, with said coating(s), with said plate(s), or, at the same time, with one or a plurality of coatings and one or a plurality of plates, said coating or said coatings being arranged adjacent to or superimposed on one another, said one or more plates being disposed adjacent to or superimposed on one another, or said coating or coatings being arranged adjacent to or superposed on said plate or plates, said coating or coatings being arranged on said plate or plates, or vice versa, said plate or plates being arranged on said coating or coatings.
  13. Method of producing means of closing a heat treatment chamber according to claim 7, comprising the steps of
    - taking a glazing, carried out by implementing the method according to claim 12,
    - taking a frame,
    - attaching said frame onto said glazing, at or onto, the means of attachment (6) of the metal fabric (5) onto the support (2) and/or onto one or a plurality of edges (8) of the support (2) so that said frame is in electrical contact with the metal fabric (5).
  14. Method of producing a heat treatment system using microwaves, comprising the steps of
    - take a baking enclosure,
    - taking the means of closing, carried out by implementing the method according to claim 13,
    - connecting said closing means to said enclosure.
EP19726003.7A 2018-10-15 2019-05-28 Microwave reflective panel, elements comprising such a panel, and method for obtaining same Active EP3868177B1 (en)

Applications Claiming Priority (2)

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EP18306352.8A EP3641499A1 (en) 2018-10-15 2018-10-15 Microwave reflective panel, elements comprising such a panel, and method for obtaining same
PCT/EP2019/063713 WO2020078593A1 (en) 2018-10-15 2019-05-28 Microwave reflecting panel, elements comprising such a panel and method for obtaining same

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EP3868177A1 EP3868177A1 (en) 2021-08-25
EP3868177B1 true EP3868177B1 (en) 2024-01-03

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US (1) US20220039220A1 (en)
EP (2) EP3641499A1 (en)
KR (1) KR102583658B1 (en)
CN (1) CN112840743B (en)
BR (1) BR112021004879B1 (en)
MX (1) MX2021002800A (en)
WO (1) WO2020078593A1 (en)

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CN107218638B (en) * 2017-06-08 2019-09-20 广东美的厨房电器制造有限公司 A kind of shield plate of microwave and microwave cooking device
US11765796B2 (en) 2020-03-31 2023-09-19 Midea Group Co., Ltd. Microwave cooking appliance with leak detection
US11770882B2 (en) 2020-03-31 2023-09-26 Midea Group Co., Ltd. Microwave cooking appliance with user interface display
US11849526B2 (en) 2020-03-31 2023-12-19 Midea Group Co., Ltd. Microwave cooking appliance with increased visibility into the cavity
WO2024068051A1 (en) * 2022-09-26 2024-04-04 Schott Vtf Panel, glazing and closure means for a device for heat treatment using microwaves

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CA1038045A (en) * 1974-12-09 1978-09-05 Junzo Tanaka Transparent shielded door screen for microwave oven
DE2847486A1 (en) * 1978-11-02 1980-05-14 Bayer Ag USE OF METALIZED TEXTILES AS A RADIATION PROTECTION AGAINST MICROWAVES
FR2484397A1 (en) 1980-06-16 1981-12-18 Trois Fontaines Verreries Safety glass for microwave appts. - with impermeable conducting barrier formed by metallic mesh
DE3714122A1 (en) 1987-04-28 1988-11-10 Miele & Cie Method of producing a door for a microwave oven
US5981927A (en) * 1996-12-13 1999-11-09 Osepchuk; John High visibility microwave oven door with screen and microwave absorbing material
JP2001237061A (en) * 2000-02-22 2001-08-31 Goh Shoji Co Inc Microwave oven
JP2005273977A (en) * 2004-03-24 2005-10-06 Hitachi Home & Life Solutions Inc Heating cooker
CN101316500A (en) * 2007-06-01 2008-12-03 哈尔滨工业大学 Production method of wire netting transparent electromagnetic shielding layer material
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KR20140014430A (en) * 2012-07-24 2014-02-06 동부대우전자 주식회사 Door for microwave oven
KR102527643B1 (en) * 2016-08-22 2023-05-03 삼성전자주식회사 Cooking appliance, door for cooking appliance and method for manufacturing door of cooking appliance

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CN112840743A (en) 2021-05-25
KR102583658B1 (en) 2023-09-27
BR112021004879A2 (en) 2021-06-01
BR112021004879B1 (en) 2024-04-30
MX2021002800A (en) 2021-05-12
US20220039220A1 (en) 2022-02-03
KR20210062077A (en) 2021-05-28
CN112840743B (en) 2023-10-31
EP3868177A1 (en) 2021-08-25
WO2020078593A1 (en) 2020-04-23
EP3641499A1 (en) 2020-04-22

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