EP3743275A1

EP3743275A1 - Method for treating and assembling glazing comprising a low emissivity layer

Info

Publication number: EP3743275A1
Application number: EP19700846.9A
Authority: EP
Inventors: Pascal SOULIÉ
Original assignee: Noemille Participations
Current assignee: Noemille Participations
Priority date: 2018-01-24
Filing date: 2019-01-23
Publication date: 2020-12-02
Also published as: FR3077028A1; WO2019145361A1; FR3077028B1

Abstract

A method for treating and assembling laminated glazing (V1a) and/or multiple laminated glazing (VM) from float type glass sheets, comprising the steps of handling at least one first glass sheet and one second glass sheet, cutting and shaping the first and the second glass sheet in order to obtain glass panels (P1, P2), depositing a low emissivity layer (C) by vacuum spraying onto one of the faces of one of the glass panels (P1, P2), and assembling the glass panels (P1, P2) as laminated glazing (Via), said layer (C) being positioned between the two glass panels (P1, P2) by means of at least one interlayer polymeric film (3, 4) or on the outside of the laminated glazing (V1) on face II, said layer (C) being intended to be positioned facing either an outer polymeric film or a counter-face or a counter laminated glazing (V2, Via) by means of seals (5) and sealed barriers.

Description

GLASS TREATMENT AND ASSEMBLY METHOD COMPRISING A LOW EMISSIVITY LAYER

The present invention relates to the field of mineral or organic glass for architecture or for motor vehicles or maritime. The invention relates more particularly to methods of treatment and assembly of thermal insulation glazing and sun protection.

To reduce warming in summer and heat loss in winter, buildings including tertiary and motor vehicles or maritime are equipped with glazing coated with a low emissivity layer.

A low emissivity layer preferentially reflects infrared but is transparent to visible light.

The low-emissivity layers, also called low emissivity, low emissivity or "low-e", are metal layers or metal oxides, deposited on clear glasses type "float", extra-clear glasses type "low-iron" Or glasses tinted in the mass, by methods of the pyrolytic type or obtained by spraying. A pyrolytic type deposit is considered a hard or a hard layer whereas a vacuum spray deposit is considered a soft or soft layer. A soft layer has a greater performance in terms of thermal insulation than a hard layer, but is more delicate.

Thus, a soft layer is generally used on the internal face of a multiple glazing unit. More specifically, these soft layers are obtained by cathodic sputtering (PVD), possibly assisted by magnetic field, commonly performed by a device called "magnetron".

These soft layers are fragile in handling and sensitive to oxidation and cleaning processes inherent in the production of laminated glass and the assembly of double or triple insulating glass. The low emissivity layers may be based on silver, aluminum, copper, gold, palladium, platinum or their mixture or alloy, more commonly silver. This soft layer is commonly deposited under a layer of so-called protective dielectric material, sacrificial or blocking, or between two dielectric layers, which have the role of fixing oxygen in particular during a heat treatment to limit or even prevent the oxidation of the soft layer. It is also commonly used a superposition of several assemblies of dielectric layer and low emissivity layer. The dielectric layers also have the function of limiting the reflection of the visible wavelengths, and of maintaining a neutrality of color in reflection. Examples of soft layers are described in EP 0 233 003, EP 0611 213 and EP 1 375 445.

These dielectric coatings are well known in the field of layered glass panels, deposited by sputtering, which are generally oxides, metal oxynitrides or nitrides, such as oxides of aluminum, chromium, tin, gallium, magnesium, niobium, silicon, titanium, yttrium, zinc and zirconium. More commonly, doped zinc oxide, for example with oxides of aluminum, gallium or tin, is combined with silver-based low-emissivity layers.

Commonly, the production of a clear glass float type is to float the molten glass on a bath of liquid tin. The molten glass, at a temperature of around 1000 ° C, is poured continuously from an oven to spread over a shallow bath made of molten tin. The glass floats on the tin, spreads out and forms a perfectly flat surface.

An extra-clear "low-iron" type glass is a "float" type glass that includes a low iron oxide content, while a bulk tinted glass is a "float" type glass comprising high levels. of metal oxides.

These sheets of glass are then directly treated by the glassmakers, by a layer deposition which is carried out on the hot glass in line (pyrolytic layers) or by electromagnetic process (vacuum layers). A low emissivity layer is generally deposited on the tin face of a glass sheet.

These layered glass panels are then delivered to the transformers who assemble them laminated and / or double or triple glazing.

It should be noted that it is not the same stakeholders that produce the layered glass sheets and assemble them into laminated glass and multiple glazing, since the installations required for a low-emissivity layer deposit represent a bulk and a substantial investment. , for which the transformers are not equipped.

In addition, work habits are well established in the glass industry and production and assembly represent two different trades.

A laminated glazing unit is an assembly of two or more sheets of mineral or organic glass assembled together by one or more plastic interlayer films, preferably thermoplastic, while a double or triple glazing is an assembly of two or three sheets of glass or laminated glazings assembled together, united on their periphery by one or metal interlayer (s) or thermoplastic interlayer (s) commonly known as "hot interlayer glazing" and separated by a air space or gas.

However, prior to these assemblies, a layered glass sheet must undergo a number of preparation steps consisting of cutting processes, shaping and heat treatment, interspersed with steps of cleaning and quality control of the soft layer. Each of these steps represents a significant risk of damaging the soft layer, resulting in a significant number of panels removed by the control steps.

The shaping of the edges of a glass panel consists essentially of the removal and polishing of the cutting edges and the grinding and polishing of the edges of the cutting edge, while the Cleaning operations consist of the reuse of demineralised water and so-called soft brushes. These last steps also present a risk of deterioration of the soft layer.

In order to obtain toughened glasses having a high mechanical strength, the glass sheets undergo a reinforcing heat treatment, at temperatures generally between 450 and 650 ° C, followed by quenching, the manipulation of a glass panel. layered glass during these treatments is also a critical operation for maintaining the quality of the low emissivity layer.

One of the final steps in the preparation of a layered glass sheet is a thermal test, commonly known as "Heat Soak Test" (HST), also called High Security Treatment. This thermal test makes it possible to remove the windows presenting risks of spontaneous breaking under the influence of the presence of inclusions of nickel sulphide.

During the float glass production process, nickel sulfide particles may sporadically penetrate the mass of a glass sheet. When producing a glass sheet in an oven, the nickel sulfide particles shrink in size and can not recover to their original size during rapid cooling of the quench.

A glass panel mounted on a facade of a building is thermally stressed by the sun's rays. During the rise in temperature of a glazing comprising an inclusion of nickel sulphide, the latter tends to increase in volume and return to its original volume, which causes an increase in internal tensions of the glass. If such a particle is in the zone of expansion voltages of the glazing, there is a probability that the level of the admissible voltages is exceeded and a spontaneous bursting of the glazing takes place.

This HST thermal test meets national standards and consists of heating the glass sheet to a temperature between 280 and 300 ° C for a time determined according to standards, between 2 and 4 hours. This rise in temperature causes an unveiling of the sheet, revealing the inclusion of nickel sulphide by the bursting of the glazing. In order to meet the standard, this thermal test must be performed, once the glass sheet is cut and shaped.

It is understood that a sheet of coated glass is more expensive than a clear glass without a layer, the realization of this compulsory thermal test for the glass panels intended to be placed at a height greater than 4 meters, is all the more more damaging on a coated glass than on a clear glass, which has in particular already undergone preparation stages, already bringing an added value.

The production of laminated glazing, one of whose glass panels has a low-emissivity layer, is manipulated to form the stack of the laminated glazing and the assembly is again manipulated for its passage in a press, producing the assembly by rolling. These manipulations present risks of deterioration of the soft layer.

At this stage, the soft layer is in the air and the risk of oxidation and scratching is not negligible. This is all the more damaging to the fact that at this stage of advancement, a laminated glazing already has a significant added value.

Although a soft layer is generally placed inside a multiple glazing, it is also possible to position it on the outer face of a glazing, but of course requires a protective layer under an outer film. Such glazing structures are for example described in the documents WO 2013/089185, EP 2685294, FR 2414114 and FR 3 030496.

In the frame of double or triple insulation glazing, the assembly of a sheet of layered glass or of a layered laminated glazing unit, at a counter-face, by means of a sealed sealing barrier, realizing a spacer between two sheets or two laminated glazings, requires, in order to obtain a good adhesion by the use of glue and / or sealant, to grind the periphery of the layered glass panel. This stage of preparation of the layered glass panel, therefore requires an additional step of cleaning the face with the soft layer, again increasing the risk of deterioration of the latter. These double or triple insulation glazings are finished products, ready for delivery, the risk of finding scratches after the fact remains important.

A defect of the low-emissivity layer, causes a phenomenon of iridescence of the glazing, which is revealed by an impression of color change according to the angle of view or illumination.

In order to improve the performance of multiple insulation glazings, the interlayer film of a laminated glass may have thermochromic, electrochromic or photovoltaic properties. These glazings are commonly called functional or dynamic glazing. A thermochromic interlayer film is composed of materials whose optical properties change as a function of temperature, in a reversible manner, for example a polymer film doped with complexes of transition metals such as vanadium oxide. The metals in these complexes change coordination, altering the transmission and color of the polymer film under the effect of temperature.

An electrochromic interlayer film has the particularity of changing optical properties under the effect of the application of an electric field. These changes in optical properties can be persistent but reversible or non-persistent, corresponding to stained glass windows called "darkening" and "shutters" respectively, as indicated in the document "layered glasses, Serge Etienne, Laboratory of Physics of Materials, UMR CNRS 7756, Nancy Pole Verrier / Cerfav, February 09 ".

A film of a glazing having non-remanent optical properties consists of a polymer matrix containing droplets of liquid crystals, while a film having persistent optical properties comprises, for example, tungsten oxide.

These interlayer films are placed in contact with conductive faces by a deposition of ITO (based on tin oxide and indium), glass panels of a laminated glazing. Glazing having a change in non-remanent optical properties is translucent when no electrical voltage is present. applied, while they are transparent when an AC voltage is applied.

Glazing with a reversible but reversible optical property change has a change in optical absorption, from a light state to a dark state and vice versa, by the application of a direct current having an opposite direction.

These functional laminated glazings are more expensive to produce, than conventional laminated glazing, deterioration of the low-emissivity layer is all the more serious, since the entirety of functional laminated glass, in case of scratches, is discarded. rejected.

Note also that under the effect of climatic constraints, a glazing must be able to deform freely. The effect of climatic loads leads to changes in the glazing geometry. They deform like a boat sail inflates. Thus, in the context of the so-called VE A technique (external glass attached), the glazing of a facade of a building integrally or partially made of glass panels, are interconnected by fasteners generally articulated, such as by ball joints, so that the windows are free to deform under the effect of climatic loads. These fixings traverse both sides of the glazing. As a result, the layered glass panels must be drilled, which represents an additional risk of damaging the low-emissivity soft layer.

The present invention provides a method of treating and assembling glazing comprising a low-emissivity soft layer, to overcome the aforementioned drawbacks.

Thus, the process for the treatment and assembly of laminated glazing and / or laminated multiple glazing, according to the invention, from glass sheets of float type, comprises the steps of taking care of at least a first sheet of glass and a second glass sheet, cutting and shaping the first and second glass sheet to obtain glass panels, depositing a low emissivity layer by vacuum spraying on one of the faces of one of the glass panels, and for assembling the glass panels in laminated glazing, while the layer being positioned between the two glass panels by means of at least one polymeric interlayer film or outside the laminated glass on the face II, said layer being intended to be positioned opposite either an outer polymeric film, or against a counterface or a laminated against glazing through seals and sealing barriers.

According to one characteristic, after the cutting and shaping steps, and prior to the deposition of the low-emissivity layer, the glass panels undergo a mechanical heat treatment step followed by quenching.

According to a complementary characteristic, the method comprises steps of drilling the glass panels prior to the deposition step of the low emissivity layer.

According to one embodiment, the method comprises a single step of washing the low-emissivity layer prior to assembling one of the glass panels, an outer polymeric film, a counterface or a against laminated glazing.

According to a further characteristic, the method comprises a step of making savings at the outer periphery of the face intended to receive the deposition of the low-emissivity layer.

According to a preferred embodiment, the laminated glazing assembly step of the glass panels by means of at least one polymeric interlayer film is performed prior to the deposition step of the low emissivity layer. According to one embodiment, at least one of the polymeric interlayer films is a functional film of the thermochromic, electrochromic or photovoltaic type, preferably thermochromic.

According to one characteristic, the low-emissivity layer is directly deposited on the surface of a glass panel, namely that the layer does not comprise dielectric materials. Other features and advantages of the invention will become apparent from the description which follows with reference to the accompanying drawings which are given by way of non-limiting examples.

Figures 1 to 3 are sectional views illustrating the processing steps and assembly of sheets, panels or glazings, according to the invention.

FIG. 1 is a view illustrating the cutting and shaping of clear glass sheet of ffoat type

Figure 2 is a view illustrating the assembly of clear glass panels in laminated glazing.

Figure 3 is a view illustrating the deposition of a low emissivity layer on a laminated glazing.

Figure 4 is a view of a laminated multiple glazing.

Figure 5 is a view of an internal layer laminated glazing unit. Figure 6 is a view of a single laminated glazing with an outer layer.

Thus, the processes according to the invention concern the treatment and assembly of laminated glazing, double or triple laminated glazing, preferentially double or triple functional laminated glazing, in which at least one glass panel (PI, P2) undergoes a step of depositing a layer (C) low emissivity deposited by vacuum spraying.

More specifically, the processes according to the invention relate to at least one step of depositing a low-emissivity layer (C) on at least one pre-cut, formed, preferably heat-treated glass panel (PI, P2). mechanical reinforcement and an HST thermal test, in view of an assembly in a laminated glazing unit and / or in a double or triple laminated glazing unit, preferably in a functional double or triple laminated glazing unit.

Note that only the processes relating to single laminated glazing and laminated double glazing, preferably functional, will be described in the remainder of the description, since the realization of a triple glazing with From a double glazing is a well-known process of the field concerned, consisting of the repetition of the steps of bonding seals, positioning a second against glazing and making sealing barriers. In the rest of the description, the mention of type glass sheet

"Float" corresponds both to the mention of clear glass, extra-clear glass type "low-iron" or glass tinted in the mass.

Note that the details of the process steps relating to the steps of sealing and sealing barriers are well known in the field and are not the subject of the invention, these steps will be briefly mentioned following the description.

It is understood that a double or triple glazing is a multiple glazing, while a functional multiple glazing, as specified above, is a thermochromic multiple glazing, electrochromic or photovoltaic, preferably thermochromic.

It is also understood that a low-emissivity layer (C) is considered as a soft layer, as previously specified.

Note that a glass sheet type "float" or a glass panel is considered as clear, when its surfaces are devoid of layer including low emissivity layer.

In the rest of the description, reference is made to "a glass sheet" for a raw substrate of the float type, while reference is made to "a glass panel" or "panel" for a cut glass sheet , shaped and having advantageously underwent a reinforcing heat treatment.

Note that a glass panel (PI, P2) is mineral or organic, preferably mineral.

Note that reference is made to the terms "external" and "internal" for the positioning of a face or a layer outside or inside a set or space between two sheets respectively . In the usual manner, the numbering of the faces of the glass panels in the following description refers to the nomenclature conventionally used for glazing, namely that the face intended to be arranged outside bears the reference I, while the face intended to be arranged inside a building or the passenger compartment of a vehicle has the highest reference, for example II for laminated glass with two glass sheets, IV for double glazing and VI for triple glazing.

References VI, Via and Vlb correspond to a layerless laminated glazing unit, an external layer laminated glazing unit and an internal layer laminated glazing unit respectively.

Recall that a laminated glazing (VI, Via, Vlb) according to the invention is achieved by the assembly of glass panels (PI, P2) which are obtained by the prior preparation of clear glass sheets (F1, F2) of type "float".

These preparation steps include the handling of glass sheets (F1, F2) which are cut to the desired glazing size, shaped by the removal and polishing of the cutting edges and the grinding and polishing of the edges of the wafer. cutting, advantageously followed by a heat treatment mechanical reinforcement at a temperature between 450 and 650 ° C, followed by quenching. These preparation steps are interposed by cleaning steps commonly used in the field concerned, by the use of demineralised water and so-called flexible brushes.

The preparatory steps of the method according to the invention make it possible in particular not to subject a panel (PI, P2) layer to a heat treatment mechanical reinforcement.

According to a complementary feature, the clear glass panels (PI, P2) undergo preparatory piercing steps in view of the formation of orifices for receiving fasteners.

According to the preceding characteristic, the realization of the steps of drilling clear glass panels (PI, P2), prior to the deposition step of the low emissivity layer, makes it possible not to damage the latter. Once clear glass panels (PI, P2) finalized, they advantageously undergo a thermal test HST.

It should also be added that the glass panels comprising inclusions of nickel sulphide are removed by the HST thermal test, prior to the deposition step of the low-emissivity layer (C), as explained hereinafter.

Let us add that once the clear glass panels (PI, P2) are ready to be assembled in laminated glazing (VI, Via, Vlb), or preassembled in laminated glazing (VI) without a layer, at least one of the faces of a clear glass panel undergoes a deposition step of a low-emissivity layer by vacuum sputtering, advantageously assisted by magnetic field.

Recall that it is understood that a clear panel does not include a layer, while a layered panel comprises a soft layer, as explained above.

It should be noted that a layered laminated glazing unit (Via, Vlb) comprises a first glass panel (PI) intended to be directed towards the outside of a building or a passenger compartment of a motor vehicle or maritime vehicle, assembled at a second glass panel (P2) via at least one polymeric interlayer film, at least one of the faces of the glass panels (PI, P2) comprises a deposition of a soft layer.

According to one embodiment, the method comprises a step of depositing a low-emissivity layer (C) on the face II of the panel (PI) intended to be directed outwards. According to the preceding embodiment, the step of assembling an internal layer laminated glazing unit (Vlb) comprises the press positioning of the face II of the panel (PI) in contact with at least one polymeric interlayer film ( 3, 4), which is itself positioned in contact with the face III of the second panel (P2) clear to be directed inwards. According to another embodiment, the method comprises a step of depositing a low-emissivity layer (C) on the face IV of the second panel (P2). According to the previous embodiment, the step of assembling an external layer laminated glazing (Via) comprises the press positioning of the first clear glass panel (PI) in contact with a polymeric interlayer film (3, 4) which is itself in contact with the face III of the second panel (F2) whose face IV is intended to be directed towards the interior of a building or a passenger compartment of a motor vehicle or maritime.

According to one characteristic, prior to the deposition step of the low-emissivity layer on the face IV of the second panel (P2), there is produced a step of making savings on the periphery of the face IV of the second panel (P2 ), for example by placing a savings tape.

The laminated glazing (Via) with an outer layer presented in the preceding embodiment is a semi-finished product, intended to be assembled with a counter-face or a laminated counter-glazing (V2, Via, Vlb) in view of the assembly of a multiple glazing unit (VM). According to another alternative, the method comprises a step of assembling an outer polymeric film (6) assembled to the face IV covered with a soft layer of the laminated glazing (Via) with an outer layer described in the preceding embodiment, in alternative to the installation of a counter-face or laminated counter-glazing (V2, Via, Vlb). According to the previous alternative, the laminated glazing (Via) is intended to be a single layer laminated glazing.

According to a preferred embodiment, a first clear panel (PI) is assembled to a second clear panel (P2) in laminated glazing (VI) without a layer, via at least one interlayer film (3, 4), while a low emissivity layer (C) is deposited on the face II of the previously obtained laminated glazing unit (VI).

The method for obtaining a laminated glazing unit (VI) without a layer, from clear panel (PI, P2), further limits the handling and exposure to air of the layer (C) soft. According to an additional characteristic, prior to the deposition of the layer (C) on the face II of the laminated glazing (VI), it is made Savings (7) on the periphery of the latter, for example by laying a savings tape.

This last characteristic makes it possible to produce a clear zone devoid of a soft layer (C) intended for the sealing application of a multiple glazing unit (VM).

This step of making a saving (7) makes it possible to produce a clear peripheral zone of quality at the edge of the second layered panel (P2) or of the external layer laminated glazing (Via), for the assembly of a glazing unit multiple (VM) quality, in opposition to a glazing on which the sealing area is achieved by grinding, more specifically carried out using a torch and a grinding operation.

It is understood that the savings tape is removed before bonding the seals (5).

According to a complementary characteristic, according to the preceding embodiments, in which a layer (C) is deposited on the face IV of the second panel (P2) before the assembly of a first laminated glazing (Via) with an outer layer , or on the face II of a first laminated glazing unit (VI) without a layer, a single washing step of the layer (C) is carried out prior to assembling a counterface or a second laminated glazing unit (V2, Via, Vlb).

Thus, the method according to the invention allows the production of laminated glazing (Via, Vlb) layer, constituting a quality semi-finished product, reducing the rate of rebus inherent in the recurrent handling of layered panels or layered laminated glazing .

In contrast to the prior art layer glass sheets, the method of the present invention not only allows a time of exposure to oxidation of the reduced low-emissivity soft layer controlled, to limit the handling and the steps washing of the layered glass panels reducing the risk of damaging the soft layer, but also not to be limited to soft layers called "hardenable", namely composed of a stack of dielectric materials and low emissivity materials. According to one embodiment, the soft layer does not comprise dielectric materials, namely consists of low emissivity materials.

According to a preferred embodiment, at least one of the polymeric interlayer films of a laminated laminated glazing unit is a functional film (4), namely of the thermochromic, electrochromic or photovoltaic type, preferably thermochromic type.

It should be noted that a thermochromic functional glazing is an independent dynamic glazing, which does not require conductive layer deposition and power supply.

According to the previous embodiment, the method according to the invention makes it possible to obtain a low-emissivity layer (C) of high quality, on a laminated glazing unit (Via, Vlb) which is a product with a high added value. , semi-finished or a finished product in the case of a deposit of an outer polymeric film (6) on the layer (C) soft.

These functional laminated glass panes (Via, Vlb) with a high added value layer, allow to obtain a high quality functional multiple glazing (VM), significantly reducing the risk of damaging the soft layer (C).

The method according to the invention also makes it possible to obtain a finished product in which the risk of subsequently finding scratches on the low-emissivity layer (C) is extremely reduced.

Let us add that according to one embodiment, the process comprises, after the deposition of a low-emissivity layer (C) on the first glass panel (PI), the positioning of at least one polymeric interlayer film (3), followed by positioning a functional film (4), possibly posteriorly and prior to the deposition of conductive layers, and placing the second glass panel (P2), the assembly being placed in a press for assembly, in view of the production of a single functional laminated glazing unit (Vlb) comprising an internal soft layer (C).

It is understood that according to known embodiments, the deposition of conductive layers is carried out either on either side of the functional film (4) electrochromic type, for example on one side of the functional film (4) and on the inner face of the second glass panel (P2).

According to a preferred embodiment, the method comprises the production of a functional laminated double glazing, comprising the steps of pressing the first panel (PI), a polymeric interlayer film (3) and / or a functional film (4), preferably thermochromic, and the second panel (P2), the assembly being placed in a press for assembly.

According to the preceding embodiment, the method comprises a step of depositing a low-emissivity layer (C) on the face II of the laminated glazing unit (VI) without a previously assembled layer, preferably after the realization of a savings ( 7).

According to the previous embodiment, the method further comprises the conventional steps of sealing bonding (5) and the production of sealing barriers.

It should be noted that a counter-face, according to embodiments, is a single glazing unit, a laminated glazing unit (Via) with an outer layer, a laminated glazing unit (Vlb) with an internal layer or a conventional laminated glazing unit (V2), without departing from the scope of the invention.

Claims

A method of processing and assembling laminated glazing (Via, Vlb) and / or laminated multiple glazing (VM) from float glass sheets, comprising the following steps: a) Supporting from minus a first glass sheet (F1) and a second glass sheet (F2), b) Cutting and shaping the first and second glass sheets (F1, F2) to obtain glass panels (PI, P2), c) Depositing a low emissivity layer (C) by vacuum spraying on one of the faces of one of the glass panels (PI, P2), d) Assembling the glass panels (PI, P2) in laminated glazing (Via, Vlb), said layer (C) being positioned between the two glass panels (PI, P2) via at least one polymeric interlayer film (3, 4) or outside the laminated glazing (VI) on the face II.

2. Method according to claim 1, characterized in that subsequent to the cutting and shaping steps, and prior to the deposition of the low emissivity layer (C), the glass panels (PI, P2) undergo a heat treatment step mechanical reinforcement followed by tempering.

3. Method according to claim 1 or 2, characterized in that it comprises steps of drilling the glass panels (PI, PI) prior to the step of depositing the layer (C) low emissivity.

4. Method according to any one of the preceding claims, characterized in that it comprises a single step of washing the layer (C) low emissivity prior to the assembly of one of the glass panels (PI, P2 ), an outer polymeric film (6), a counterface or a laminated counter-glazing (V2, Via, Vlb).

5. Method according to any one of the preceding claims, characterized in that it comprises a step of realizing savings (7) in outer periphery of the face intended to receive the deposit of the layer (C) low emissivity.

6. Method according to any one of the preceding claims, characterized in that the laminated glazing assembly step (Via) of the glass panels (PI, P2) via at least one polymeric interlayer film ( 3, 4), is performed prior to the deposition step of the layer (C) low emissivity.

7. Method according to any one of the preceding claims, characterized in that at least one of the polymeric interlayer films is a functional film (4) of thermochromic, electrochromic or photovoltaic type, preferably thermochromic.

8. Method according to any one of the preceding claims, characterized in that the layer (C) low emissivity is directly deposited on the surface of a glass panel (PI, P2).