Glazing having improved acoustic insulation and moisture absorption performance

Abstract

The invention relates to glazing comprising at least two glass walls (7, 17, 27) forming a cavity therebetween. The cavity comprises at least one device comprising at least one plate (3, 11, 23), the plate (3, 11, 23) comprising a plurality of perforations (6, 16, 26) which are arranged periodically and delimit a chamber (2, 12) arranged in the cavity, the device further comprising desiccant means configured to absorb moisture present in the at least one chamber.

Description

Description Title of the invention: Glazing with improved sound insulation and moisture absorption performance Previous technique

[0001] The present invention belongs to the general field of glazing manufacturing. More particularly, it relates to a device configured to improve the acoustic insulation performance of glazing and to limit the presence of moisture between the panes of said glazing. It also relates to glazing incorporating at least one such device. The invention finds a particularly advantageous, though by no means limiting, application in the case of building glazing.

[0002] Double glazing consisting of two panes of glass separated by a cavity filled with gas, typically air, is classically used in windows and building facades for its thermal and acoustic insulation performance.

[0003] However, the sound transmission loss caused by such double glazing decreases for frequencies surrounding the so-called "mass / spring / mass" frequency, which corresponds to the resonance frequency of the double glazing and is located in the low frequencies. This phenomenon, called the mass / spring / mass effect, is due to significant pressure variations in the air cavity at the mass / spring / mass frequency.

[0004] Also, in order to improve the acoustic insulation performance of glazing, various solutions have been developed. For example, US document 2010 / 0300800 describes acoustic glazing, in particular aircraft cockpit glazing, comprising a first pane of glass separated from a second intermediate pane of glass by a layer of acoustic PVB (polyvinyl butyral), the second pane of glass being separated from a third pane of glass by a layer of standard PVB or polyurethane.

[0005] However, this solution does not improve low-frequency sound insulation. To improve low-frequency sound insulation, an existing passive solution is to increase the thickness of the glass panels or the thickness of the glazing cavity. However, this leads to bulky, very heavy structures with an unfavorable onboard carbon footprint.

[0006] Beyond improving the acoustic performance of glazing while respecting space and weight constraints, the solutions considered also face challenges related to managing moisture between the panes of glass within a window unit. More specifically, the challenge lies in being able to absorb residual water vapor in the cavity between the panes during the manufacturing process and throughout the window's lifespan.

[0007] There is therefore a real need to provide a system that improves the acoustic insulation properties of glazing, particularly in the low frequencies, as well as its moisture absorption performance, while also allowing the glazing to be relatively light and compact. Description of the invention

[0008] The present invention aims to remedy all or part of the disadvantages of the prior art, in particular those set out above, by proposing a solution which makes it possible to obtain glazing which is much more effective than that of the solutions of the prior art in terms of acoustic insulation but also of moisture absorption between glazed walls of said glazing.

[0009] Thus, according to a first aspect, the invention relates to a glazing comprising at least two glazed walls forming a cavity between them. The cavity comprises at least one device comprising at least one plate, said plate comprising a plurality of perforations arranged periodically and delimiting a chamber located within the cavity, the device further comprising desiccating means configured to absorb moisture present in said at least one chamber.

[0010] In particular embodiments, the glazing may also include one or more of the following characteristics, taken individually or in all technically possible combinations.

[0011] In particular embodiments, the drying means comprise drying means arranged inside said at least one chamber, referred to as "internal drying means".

[0012] In particular embodiments, a porous absorbent material is present inside said at least one chamber, preferably chosen from the group consisting of mineral wools, textile fibers, polymer foams and combinations thereof, said internally arranged desiccating means comprising granules integrated into said porous absorbent material and / or a bar arranged in a cavity of said porous absorbent material.

[0013] In particular embodiments, the internal desiccant means comprise granules gathered in at least one casing.

[0014] In particular embodiments, at least one envelope is held in a fixed position by contact with an internal wall of said at least one chamber and a porous absorbing material present inside said at least one chamber, preferably chosen from the group consisting of mineral wools, textile fibers, polymer foams and combinations thereof.

[0015] In particular embodiments, said at least one envelope comprises: - two envelopes respectively arranged at opposite ends of said at least one chamber, or - three envelopes, of which two envelopes are respectively arranged at opposite ends of said at least one chamber and one envelope is arranged substantially centrally between said two envelopes arranged at the ends.

[0016] In particular embodiments, the internal drying means comprise at least one plate made of a solid material, called an "absorbent" plate.

[0017] In particular embodiments, said internal drying means comprise a stack of a first layer and a second layer, called an "absorbent stack", said two layers being preferably parallel to the perforated plate, the first layer being said absorbent plate and the second layer being a porous absorbent material present inside said at least one chamber, preferably chosen from the group consisting of mineral wools, textile fibers, polymer foams and combinations thereof.

[0018] In particular embodiments, the internal drying means comprise a plurality of absorbent stacks.

[0019] In particular embodiments, all or part of the internal desiccating means are maintained in a fixed position in said at least one chamber.

[0020] In particular embodiments, the drying means comprise drying means fixedly arranged outside said at least one chamber, called "external drying means", in contact with the perforated plate of said at least one chamber and arranged so as to leave said perforations free.

[0021] In some embodiments, the device plate includes at least three perforations, preferably at least four perforations.

[0022] In some embodiments, the perforations have a maximum diameter or dimension of 0.2 mm to 8 mm, preferably 0.5 mm to 8 mm.

[0023] In some embodiments, the centers of the perforations are spaced at a distance of 5 mm to 200 mm, preferably 10 mm to 110 mm.

[0024] In some embodiments, the thickness of the plate is from 0.1 mm to 15 mm, preferably from 0.2 mm to 1 mm.

[0025] In some embodiments, the plate and chamber are configured to resonate at a low frequency.

[0026] In some embodiments, the plate is made of metallic material, preferably aluminum and / or stainless steel, and / or polymer material, preferably polyethylene, polycarbonate, polypropylene, polystyrene, polybutadiene, polyisobutylene, polyester, polyurethane, polymethyl methacrylate, polyacrylate, polyamide, polyethylene terephthalate, polybutylene terephthalate, acrylonitrile, butadiene styrene, acrylonitrile styrene acrylate, styrene-acrylonitrile copolymer, or a combination thereof, the polymer material being optionally reinforced with glass fibers.

[0027] In some embodiments, the glazing comprises at least two plates, preferably at least three plates, each comprising a plurality of perforations arranged periodically and delimiting a chamber disposed in the cavity, preferably the periodicities of the perforations of at least two of the plates, more preferably of at least three plates, are different from each other.

[0028] In some embodiments, at least one plate of the device comprising a plurality of periodically arranged perforations and the chamber it delimits are configured to resonate at the mass / spring / mass frequency of the glazing.

[0029] In some embodiments, the device further comprises: - at least one second plate comprising a plurality of perforations arranged periodically and delimiting a second chamber disposed within the cavity, said second plate and chamber being configured to resonate at a frequency one-third of an octave lower than the mass / spring / mass frequency of the glazing; and - at least one third plate comprising a plurality of perforations arranged periodically and delimiting a third chamber disposed in the cavity, said third plate and chamber being configured to resonate at a frequency one-third of an octave higher than the mass / spring / mass frequency of the glazing.

[0030] In some embodiments, the device is a spacing device fixed to each of the two glazed walls and comprises at least one straight tubular profile including at least one upper wall, one lower wall and two side walls defining the chamber, in which the upper wall constitutes the plate comprising a plurality of perforations arranged periodically.

[0031] In some embodiments, the chamber of the profile has a thickness, between the upper wall and the lower wall of the profile, of 2 mm to 200 mm, preferably of 5 mm to 50 mm.

[0032] In some embodiments, the device is a spacing device fixed to each of the two glazed walls and comprises at least one straight bar, in which the bar constitutes the plate comprising a plurality of perforations arranged periodically, said bar defining the chamber with the two glazed walls, said chamber extending between the two glazed walls, from the bar to an edge of the glazing.

[0033] In some embodiments, the chamber has a thickness, between the bar and the edge of the glazing, of 2 mm to 200 mm, preferably of 5 mm to 50 mm.

[0034] In some embodiments, the device comprises a rectilinear box including at least one upper wall, one lower wall, two longitudinal side walls and two transverse side walls defining the chamber, in in which the upper wall or one of the longitudinal side walls constitutes the plate comprising a plurality of perforations arranged periodically, the width of said box being less than the thickness of the cavity between the two glazed walls in the same direction and, preferably, the length of said box being less than the length of the cavity in the same direction.

[0035] In some embodiments, the chamber of the box has a thickness, between the wall of the box comprising the perforations arranged periodically and the wall opposite it, of 2 mm to 200 mm, preferably of 5 mm to 50 mm.

[0036] In some embodiments, a porous absorbent material is present inside the chamber, preferably chosen from the group consisting of mineral wools, textile fibers, polymer foams and combinations thereof.

[0037] In some embodiments, the device is positioned in a peripheral area of ​​the glazing cavity.

[0038] In some embodiments, glazing is building glazing, such as facade glazing, building window or door glazing, or interior glazing.

[0039] In some embodiments, the chamber delimited by at least one perforated plate is in fluidic communication with the glazing cavity formed between the glazed walls via the perforations of the perforated plate.

[0040] In other words, the perforations in the perforated plate open into the cavity of the glazing formed between the glass panes.

[0041] In some embodiments, the ratio between the area of ​​all the perforations of at least one periodically arranged perforated plate and the total area of ​​the plate is from 0.001% to 8%.

[0042] Such a ratio makes it possible to obtain a resonance of the perforated plate and the chamber it delimits.

[0043] The invention also relates to a glazing spacing device comprising at least one straight tubular profile including at least one upper wall, one lower wall and two side walls defining a chamber, in which the upper wall includes a plurality of perforations arranged periodically, desiccant means configured to absorb moisture being present in said chamber.

[0044] The invention also relates to a glazing spacer comprising at least one straight strip comprising a plurality of perforations arranged periodically and defining a chamber, desiccant means configured to absorb moisture being present in said chamber.

[0045] The invention also relates to a glazing device comprising at least one straight box including at least one upper wall, one lower wall, two longitudinal side walls and two transverse side walls defining a chamber, in which the upper wall or one of the longitudinal side walls includes a plurality of perforations arranged periodically, desiccating means configured to absorb moisture being present in said chamber.

[0046] The present invention addresses the need expressed above. More specifically, it provides a glazing device that enables glazing with improved acoustic insulation, particularly in the low and medium frequencies, but also in the high frequencies, while remaining relatively lightweight and compact.

[0047] This is achieved through the presence, within the device, of a plate on which a plurality of perforations are periodically arranged, this plate forming a chamber. The combination of this chamber with the periodic perforations on the plate creates resonators that absorb at least some of the sound energy within the glazing cavity formed by the two glass panes, thus reducing sound transmission through the glazing. In particular, the resonators absorb sound energy significantly at frequencies close to their resonant frequency(ies).Furthermore, the absorption of energy also for the harmonic frequencies of the resonators as well as physical phenomena related to the modification of the properties of the gas cavity of the glazing, due to the presence of the resonators, also improves the acoustic insulation at frequencies higher than the resonance frequencies of the resonators.

[0048] Furthermore, the present invention also addresses the need for moisture absorption between the glazed panels of said glazing. This is accomplished by to the desiccant means used to absorb moisture in a defined chamber by means of the perforated plate.

[0049] It should be noted that the various components forming the device according to the invention can be opaque, transparent, or semi-transparent. This improves the visual appearance of the glazing according to the invention. Brief description of the drawings

[0050] Other features and advantages of the present invention will become apparent from the description below, with reference to the accompanying drawings, which illustrate an example of an embodiment without being limiting in any way. In the figures: [Fig. 1] Figure 1 represents on its left part an example of glazing according to the invention and, on its right part, an enlarged schematic and perspective view of the profile of an example of a device according to the invention present in this example of glazing; [Fig. 2] Figure 2 represents on its left part another example of glazing according to the invention and, on its right part, an enlarged schematic and perspective view of the box of an example of a device according to the invention present in this example of glazing; [Fig. 3] Figure 3 represents on its left part another example of glazing according to the invention and, on its right part, an enlarged schematic and perspective view of the bar of an example of a device according to the invention present in this example of glazing; [Fig. 4] Figure 4 schematically represents yet another particular embodiment of a glazed assembly according to the invention; [Fig. 5] Figure 5 represents in flowchart form the main steps of a manufacturing process for a glazed assembly according to the invention; [Fig. 6] Figure 6 schematically represents, following a longitudinal cross-sectional view, a particular embodiment of the device in Figure 1; [Fig. 7] Figure 7 schematically represents, following a longitudinal cross-sectional view, another particular embodiment of the device in Figure 1; [Fig. 8] Figure 8 schematically represents, following a longitudinal cross-sectional view, another particular embodiment of the device in Figure 1; [Fig. 9] Figure 9 schematically represents, following a longitudinal cross-sectional view, another particular embodiment of the device of Figure 1; [Fig. 10] Figure 10 schematically represents, following a longitudinal cross-sectional view, another particular embodiment of the device of Figure 1; [Fig. 11] Figure 11 schematically represents, following a longitudinal cross-sectional view, another particular embodiment of the device of Figure 1; [Fig. 12] Figure 12 schematically represents, following a longitudinal cross-sectional view, another particular embodiment of the device of Figure 1. Description of implementation methods

[0051] The invention is now described in more detail and in a non-limiting manner in the following description.

[0052] The invention relates primarily to a glazing device.

[0053] The remainder of the description aims firstly to set out, according to embodiments, aspects of the configuration of said device enabling the glazing which is equipped with it to provide excellent performance in terms of acoustic insulation.

[0054] The configuration aspects of the device enabling the glazing equipped with it to greatly limit the presence of moisture between the glass panes of the glazing are described later.

[0055] Glazing can be any type of glazing comprising at least two glazed panes defining a cavity between them. For the purposes of the present invention, the cavity of a glazing unit is defined as the volume enclosed between two glazed panes of said glazing unit.

[0056] The device according to the invention can be a glazing spacer. By "spacer," we mean any device for fixing the length of the gap between the glass panes of the glazing unit in which it is intended to be placed.

[0057] Alternatively, the device according to the invention may not be used as a spacing device.

[0058] The device according to the invention comprises at least one plate comprising a plurality of perforations arranged periodically (also referred to as "perforated plate" hereafter).

[0059] Preferably, the device plate comprises, or is made of, a metallic material, such as aluminum and / or stainless steel, and / or a polymer material, such as polyethylene, polycarbonate, polypropylene, polystyrene, polybutadiene, polyisobutylene, polyester, polyurethane, polymethyl methacrylate, polyacrylate, polyamide, polyethylene terephthalate, polybutylene terephthalate, acrylonitrile, butadiene styrene, acrylonitrile styrene acrylate, a styrene-acrylonitrile copolymer, or a combination thereof, optionally reinforced with glass fibers.

[0060] The plate comprises two main faces opposite each other and bearing the perforations, referred to in this text as "external face" (corresponding to the face intended to be closest to the edge of the glass walls of the glazing) and "internal face" (corresponding to the face intended to face the center of the cavity formed between the glass walls of the glazing).

[0061] We can define for the perforated plate a length, corresponding to the largest dimension of the plate in the plane of its principal faces (also called "principal plane of the plate", a width, corresponding to the dimension of the plate along a direction perpendicular to the direction of the length of the plate, in the principal plane of the plate, and a thickness, corresponding to the dimension of the plate along a direction perpendicular to the principal plane of the plate (and therefore corresponding to the dimension of the plate between its two principal faces).

[0062] The perforated plate is preferably rectangular parallelepiped (that is to say, it has a constant length, width and thickness).

[0063] When the device according to the invention is a spacer, the width of the perforated plate preferably determines the length of the gap between the panes of glass (i.e., the thickness of the cavity between the panes) of the glazing in which the spacer is intended to be used. The width of the plate can be from 6 to 30 mm, preferably from 10 to 20 mm, for example 16 mm or 20 mm, particularly in embodiments where the device is a spacer.

[0064] The thickness of the perforated plate is advantageously from 0.1 to 15 mm, more preferably from 0.2 to 1 mm. In particular, the perforated plate can have a thickness of 0.1 to 0.2 mm, or from 0.2 to 0.4 mm, or from 0.4 to 0.6 mm, or from 0.6 to 0.8 mm, or from 0.8 to 1 mm, or from 1 to 1 to 1.2 mm, or from 1.2 to 1.5 mm, or from 1.5 to 2 mm, or from 2 to 3 mm, or from 3 to 4 mm, or from 4 to 5 mm, or from 5 to 10 mm, or from 10 to 15 mm.

[0065] The plate comprises a plurality of perforations arranged periodically. By "plurality of perforations" is meant at least two perforations. More specifically, the plate may comprise two, or three, or at least three, or four, or at least four, or five, or at least five, or six, or at least six, or seven, or at least seven, or eight, or at least eight, or nine, or at least nine, or ten, or at least ten, perforations arranged periodically. The more periodically arranged perforations the plate comprises, the more the sound insulation of the glazing in which the device is located is improved. Most preferably, the plate comprises at least three perforations, and more preferably at least four, arranged periodically.

[0066] By "periodically arranged perforations," it is understood that said perforations are identical and are present at regular intervals within the plate (i.e., the distance between the centers of two adjacent perforations is constant). The perforations are made across the entire thickness of the plate (they extend from the inner face of the plate to its outer face) and establish fluid communication between the spaces located on either side of the plate (i.e., they allow the circulation of a fluid, and more particularly a gas, from one space to another). Advantageously, the periodic perforations are all aligned, more preferably along a longitudinal axis of the plate (i.e., along its length). Even more advantageously, the perforations are arranged along a longitudinal axis of the plate located at the midpoint of the plate's width.

[0067] The perforations can have any suitable shape. In some embodiments, they have a cross-section (i.e., in the principal plane of the plate) that is circular or substantially circular.

[0068] Advantageously, the perforations in the plate are micro-perforations. By "micro-perforations" we mean holes whose diameter or dimension The maximum diameter (in the principal plane of the plate) is less than or equal to 8 mm. Preferably, the perforations have a diameter, or a maximum dimension (in the principal plane of the plate) of 0.2 to 8 mm, more preferably 0.5 to 8 mm. In embodiments, the maximum diameter or dimension of the perforations may be 0.2 to 0.5 mm, or 0.5 to 1 mm, or 1 to 2 mm, or 2 to 3 mm, or 3 to 4 mm, or 4 to 5 mm, or 5 to 6 mm, or 6 to 7 mm, or 7 to 8 mm.

[0069] Preferably, the periodic perforations are distributed along the entire length of the plate. Alternatively, the perforations may be arranged periodically over only a portion of the plate's length, for example, over a portion of the plate with a length less than or equal to 90%, or less than or equal to 80%, or less than or equal to 70%, or less than or equal to 60%, or less than or equal to 50%, or less than or equal to 40%, or less than or equal to 30%, or less than or equal to 20%, or less than or equal to 10% of the plate's length.

[0070] For each perforation, a geometric center of said perforation can be defined (hereafter simply called the "center"). The distance between the centers of two adjacent perforations is preferably 5 to 200 mm, more preferably 10 to 110 mm. The distance between the centers of two adjacent periodic perforations may be 5 to 10 mm, or 10 to 20 mm, or 20 to 30 mm, or 30 to 40 mm, or 40 to 50 mm, or 50 to 60 mm, or 60 to 70 mm, or 70 to 80 mm, or 80 to 90 mm, or 90 to 100 mm, or 100 to 110 mm, or 110 to 120 mm, or 120 to 140 mm, or 140 to 160 mm, or 160 to 180 mm, or 180 to 200 mm.

[0071] Advantageously, the open area ratio (i.e., the ratio of the area of ​​all the periodically arranged perforations to the total area of ​​the plate (including the area of ​​the perforations)) is from 0.01 to 8%, preferably from 0.05 to 0.8%. The open area ratio can be from 0.01 to 0.05%, or from 0.05 to 0.1%, or from 0.1 to 0.2%, or from 0.2 to 0.3%, or from 0.3 to 0.4%, or from 0.4 to 0.5%, or from 0.5 to 0.6%, or from 0.6 to 0.7%, or from 0.7 to 0.8%, or from 0.8 to 0.9%, or from 0.9 to 1%, or from 1 to 2%, or from 2 to 3%, or from 3 to 4%, or from 4 to 5%, or from 5 to 6%, or from 6 to 7%, or from 7 to 8%.

[0072] The perforated plate defines a chamber, either within the device itself or within the glazing in which it is placed. The chamber is located inside the glazing cavity.

[0073] The chamber thickness is preferably from 2 to 200 mm, more preferably from 5 to 50 mm. The chamber thickness corresponds to the dimension of the chamber in a direction perpendicular to the main plane of the plate. In some embodiments, the chamber has a thickness of 2 to 5 mm, or 5 to 10 mm, or 10 to 20 mm, or 20 to 30 mm, or 30 to 40 mm, or 40 to 50 mm, or 50 to 60 mm, or 60 to 70 mm, or 70 to 80 mm, or 80 to 90 mm, or 90 to 100 mm, or 100 to 120 mm, or 120 to 140 mm, or 140 to 160 mm, or 160 to 180 mm, or 180 to 200 mm.

[0074] The dimensions and configuration of the plate, its perforations, and the chamber can be chosen according to the desired resonant frequency of the plate and chamber assembly. The relationship between the resonant frequency of the perforated plate and the plate thickness, chamber thickness, perforation spacing, and perforation size and distribution can be estimated using the following formula:

[0075] [Math. 1] [ L 0076] J f 1 = 54000.

[0077] In this equation 1, o is the open area ratio (dependent on the size of the perforations and their distribution), L is the thickness of the plate in m, D is the thickness of the chamber in m and d is the distance between the centers of two adjacent perforations in m.

[0078] Advantageously, the plate and chamber system is configured to resonate at low frequencies. "Low frequencies" refers to sound waves with frequencies below 300 Hz. For example, the plate and chamber system can be configured to resonate at frequencies less than or equal to 250 Hz, or less than or equal to 225 Hz, or less than or equal to 200 Hz, or less than or equal to 175 Hz, or less than or equal to 150 Hz. In other embodiments, the plate and chamber system can be configured to resonate at frequencies less than or equal to 400 Hz, or less than or equal to 350 Hz.

[0079] The plate preferably comprises a single series of perforations arranged periodically. Alternatively, it may comprise several series of perforations arranged periodically within the plate, such as at least two or three series, each series being different from the others (for example, the size of the perforations and / or the distance between the centers of two adjacent perforations may be different in each series). When the plate comprises several series of periodic perforations, each series is located in a different portion of the plate (depending on its length). The presence of several different series of periodic perforations allows the plate-chamber system to resonate at multiple frequencies, with each portion of the plate-chamber system containing a different series of periodic perforations having a different resonant frequency.

[0080] The chamber may contain a porous absorbent material inside. Preferably, a "porous absorbent material" is defined as a material characterized by a porosity greater than or equal to 0.7 and / or an air resistance of 5,000 to 150,000 Nsnr. 4 The porosity of the material can be measured using a porosimeter according to the fluid saturation method, by mercury intrusion. Air resistance can be measured according to standard NF EN ISO 9053-1. The presence of such a porous absorbent material in the chamber can increase the acoustic performance of the device and thus further improve the sound insulation of the glazing in which it is placed.

[0081] The porous absorbent material may have a porosity greater than or equal to 0.75, or greater than or equal to 0.8, or greater than or equal to 0.85, or greater than or equal to 0.9, or greater than or equal to 0.95, for example, a porosity of 0.7 to 0.75, or 0.75 to 0.8, or 0.8 to 0.85, or 0.85 to 0.90, or 0.90 to 0.95, or 0.95 to 0.99. Particularly preferred, the porous absorbent material has a porosity of 0.7 to 0.99, and more preferably greater than or equal to 0.9. The air resistance of the porous absorbent material may be from 5,000 to 10,000 Nsnr 4 , or from 10,000 to 20,000 Nsnr 4 , or from 20,000 to 40,000 Nsnr 4 , or from 40,000 to 60,000 Nsnr 4 , or from 60,000 to 80,000 Nsnr 4 , or from 80,000 to 100,000 Nsnr 4 , or from 100,000 to 120,000 Nsnr 4 , or from 120,000 to 140,000 Nsnr 4 , or from 140,000 to 150,000 Nsnr 4Preferably, the porous absorbent material has an air resistance of 20,000 to 100,000 Nsnr 4 .

[0082] The porous absorbent material is advantageously a textile fiber, mineral wool, polymer foam, or a combination thereof. The textile fiber may be a textile made of cotton fibers, flax fibers, hemp fibers, coconut fibers, polyester fibers, cellulose fibers, or a combination thereof. The mineral wool may be selected from the group consisting of glass wool, rock wool, and combinations thereof. The polymer foam may be selected from the group consisting of melamine foams, polyurethane foams, polyethylene foams, and combinations thereof.

[0083] The porous absorbent material can fill the entire chamber. Alternatively, the porous absorbent material can be present in only a part of the chamber; for example, the volume of the porous absorbent material can be 2 to 20%, or 20 to 40%, or 40 to 60%, or 60 to 80%, or 80 to 98% of the total volume of the chamber.

[0084] Alternatively, or in addition, the chamber may contain a gas. The gas may in particular be air and / or argon, and / or carbon dioxide, and / or krypton and / or xenon.

[0085] The perforations can be covered with fabric, either partially or, preferably, entirely. For example, the fabric can be glued to the plate by any suitable means, such as to the inner surface of the plate. Alternatively, or additionally, the fabric can be placed on a porous absorbent material as described above, for example, glued to said porous absorbent material, the porous absorbent material being placed inside the chamber so that the fabric is against all or part, preferably all, of the perforations. The fabric thus forms a screen against the perforations exhibiting a certain resistivity. Without wishing to be bound by any theory, the inventors believe that when the sound wave passes through the fabric to enter the chamber, it encounters a resistivity due to the presence of the fabric, which improves the absorption of sound energy and therefore the acoustic insulation of the glazing containing the device at low, medium, and high frequencies.When the fabric is fixed to a porous absorbent material positioned in the room, the sound insulation of the glazing is further improved. The fabric advantageously has a thickness ranging from 0.1 to 3 mm, preferably from 0.2 to 1 mm. The fabric can be made of any woven natural or synthetic fibers, such as, for example, cotton and / or linen fibers. The fabric preferably has a porosity of 0.07 to 0.99. more preferably from 0.5 to 0.99, and / or an air resistance value of 90,000 to 3,500,000 Nsnr 4 , more preferably from 300,000 to 3,000,000 Nsnr 4 Air resistance and porosity can be measured as described above. The fabric may have a porosity of 0.07 to 0.2, or 0.2 to 0.4, or 0.4 to 0.6, or 0.6 to 0.8, or 0.8 to 0.99. The fabric's air resistance can range from 90,000 to 300,000 Nsnr 4, or from 300,000 to 500,000 Nsnr 4 , or from 500,000 to 1,000,000 Nsnr 4 , or from 1,000,000 to 1,500,000 Nsnr 4 , or from 1,500,000 to 2,000,000 Nsnr 4 , or from 2,000,000 to 2,500,000 Nsnr 4 , or from 2,500,000 to 3,000,000 Nsnr 4 , or from 3,000,000 to 3,500,000 Nsnr 4 .

[0086] Advantageously, the interior of the chamber consists of gas and / or one or more porous absorbent materials as described above, possibly covered with a fabric as described above.

[0087] With reference to Figure 1, according to a first embodiment, the device according to the invention comprises at least one straight tubular profile 1. By "tubular profile" is meant a hollow profile, that is to say, one comprising a cavity or chamber 2. By "straight profile" is meant that the profile is straight along its length (a longitudinal axis of the profile can therefore be defined). According to this embodiment, the device is advantageously a spacing device.

[0088] The tubular profile 1 comprises at least one upper wall 3, one lower wall 4, and two side walls 5 defining the chamber 2 of the profile. In this text, the terms "upper" and "lower" are used with reference to the orientation of the profile 1 shown on the right-hand side of Figure 1. However, the profile 1 can of course have any possible orientation, such as, for example, an orientation in which the longitudinal axis of the profile is vertical or an orientation in which the upper wall is below the lower wall (as shown on the left-hand side of Figure 1).

[0089] The upper wall 3 comprises a plurality of perforations 6 arranged periodically. Thus, the profile 1 according to the invention is also referred to as the "perforated (tubular) (straight) profile" in this text. The perforations 6 are made through the entire thickness of the upper wall and establish fluid communication between the chamber 2 of the profile and the environment outside the profile (i.e., they allow the circulation of a fluid, and more particularly a gas, from the chamber 2 of the profile to the external environment and vice versa).

[0090] In this first variant, the upper wall 3 of the profile corresponds to the plate comprising a plurality of periodically arranged perforations of the device described above, and the chamber 2 of the profile corresponds to the chamber delimited by the plate described above. Thus, everything described in this text with respect to the perforated plate and with respect to the chamber delimited by the perforated plate applies to the upper wall 3 of the profile 1 and to the chamber 2 of the profile, respectively.

[0091] In this variant, the thickness of the chamber inside the profile 1 is the distance between the upper wall 3 and the lower wall 4 of the profile 1.

[0092] The upper wall 3 and the lower wall 4 of the profile can be connected by two side walls 5 (each of the two side walls 5 connecting a longitudinal edge of the upper wall 3 to a longitudinal edge of the lower wall 4). In other embodiments, the upper wall 3 and the lower wall 4 can be connected to each other by any number of walls.

[0093] Advantageously, the main plane of the upper wall 3 and the main plane of the lower wall 4 are parallel to each other and, even more advantageously, they are perpendicular to the main planes of the two side walls 5.

[0094] Preferably, the straight profile 1 comprises, or is made of, a material such as mentioned above in relation to the perforated plate.

[0095] Preferably, the lower wall 4 and / or each of the two side walls 5 has a rectangular parallelepiped shape.

[0096] Advantageously, the length of the upper wall 3 of the profile 1 is equal to the length of the cavity between the glazed walls 7 of the glazing 10 in which the device is intended to be placed, in the same direction.

[0097] With reference to Figure 2, according to a second embodiment, the device according to the invention comprises at least one straight bar 11. The term "bar" refers to a rectangular parallelepiped-shaped solid. The bar comprises a plurality of perforations 16 arranged periodically. Thus, the bar 11 according to the invention is also referred to as a "perforated (straight) bar" in this text. According to this second embodiment, the device is advantageously a spacing device.

[0098] In this second variant, the bar 11 corresponds to the plate comprising a plurality of periodically arranged perforations in the device. Thus, everything described in this text in relation to the perforated plate applies to the perforated bar.

[0099] When placed in a glazing 20 (between two glazed walls 17 of the glazing), the perforated strip according to the invention defines a chamber 12 between the glazed walls. This chamber 12 extends from the perforated strip 11 to one of the edges of the glazed walls 17. This edge is advantageously the edge of the glazed walls 17, preferably parallel to the perforated straight strip 11, closest to the perforated straight strip 11.

[0100] In this second variant, the chamber 12 formed between the glazed walls, extending from the perforated strip to the edge of the glazed walls, corresponds to the chamber delimited by the plate described above. Therefore, everything described in this text relating to the chamber delimited by the perforated plate applies to the chamber 12 formed between the glazed walls, extending from the perforated strip to the edge of the glazed walls.

[0101] In this variant, the thickness of chamber 12 corresponds to the dimension of the chamber between the perforated strip 11 and the edge of the glazed walls 17.

[0102] Advantageously, the length of the bar 11 is equal to the length of the cavity between the glazed walls 17 of the glazing 20 in which it is intended to be placed, in the same direction.

[0103] With reference to Figure 3, according to a third variant, the device according to the invention comprises at least one rectilinear box 21. By "box" is meant a hollow closed structure, that is to say comprising a cavity or chamber.

[0104] The enclosure comprises at least one upper wall 23, one lower wall 24, two longitudinal side walls 25 (preferably opposite each other), and two transverse side walls 28 (preferably opposite each other) defining the chamber of the enclosure. A "longitudinal side wall" is understood to be a side wall parallel to the longitudinal axis of the straight enclosure, and a "transverse side wall" is understood to be a side wall perpendicular to the longitudinal axis of the straight enclosure. In this text, the terms "upper" and "lower" are used with reference to the orientation of the enclosure 21 shown on the right-hand side of Figure 3. of course, the box can have any other possible orientation, as shown for example on the left part of figure 3. The upper wall 23 of the box corresponds to the wall intended to face the center of the cavity formed between the glazed walls 27 of the glazing 30, the lower wall 24 corresponds to the wall of the box 11 intended to be closest to the edge of the glazed walls 27 of the glazing 30, the longitudinal side walls 25 are intended to be parallel to the glazed walls 27 and the transverse side walls 28 are intended to be perpendicular to the glazed walls 27.

[0105] The upper wall 23 and the lower wall 24 of the enclosure can be connected by two longitudinal side walls 25 (each of the two longitudinal side walls 25 connecting a longitudinal edge of the upper wall 23 to a longitudinal edge of the lower wall 24). In other, less preferred embodiments, the upper wall 23 and the lower wall 24 can be connected to each other by any number of longitudinal walls 25. The upper wall 23 and the lower wall 24 of the enclosure are preferably connected to each other by two transverse side walls 28 (each of the two transverse side walls 28 connecting a transverse edge of the upper wall 23 to a transverse edge of the lower wall 24).

[0106] Advantageously, the principal plane of the upper wall 23 and the principal plane of the lower wall 24 are parallel to each other. Preferably, the principal planes of the longitudinal side walls 25 are parallel to each other. Preferably, the principal planes of the transverse side walls 28 are parallel to each other. Even more advantageously, the principal planes of the upper wall 23 and the lower wall 34 are perpendicular to the principal planes of the two longitudinal side walls 25 and to the principal planes of the two transverse side walls 28. Particularly preferred, the enclosure 21 according to the invention has the shape of a parallelepiped, even more preferably a rectangular parallelepiped.

[0107] Each of the walls of the box 21 can independently have a rectangular parallelepiped shape, preferably each of the walls of the box 21 has a rectangular parallelepiped shape.

[0108] In this third variant, we can define for the box 21 a length corresponding to the dimension of the box 21 along the longitudinal axis of the box The box is straight and has a width corresponding to the dimension of the box 21 in a direction perpendicular to the longitudinal axis of the straight box, in the principal plane of the upper wall 23 of the box. Preferably, the width of the box 21 is less than the thickness of the cavity between the glazed walls U (in the same direction) of the glazing unit 30 in which it is intended to be placed. Thus, in this variant, the device is preferably not a spacer. Preferably, at least one of the longitudinal side walls 25 (one or both) is not in contact with a glazed wall U when the box is placed in a glazing unit 30.

[0109] The width of the box 21 can be from 1 to 99% of the thickness of the cavity between the glazed walls of the glazing, for example from 1 to 10%, or from 10 to 20%, or from 20 to 30%, or from 30 to 40%, or from 40 to 50%, or from 50 to 60%, or from 60 to 70%, or from 70 to 80%, or from 80 to 90%, or from 90 to 99% of the thickness of the cavity between the glazed walls 27. The width of the box 21 can be from 5 mm to less than the thickness of the cavity between the glazed walls 27, for example the width of the box 21 can be from 5 mm to 29 mm, or from 5 mm to 19 mm, or from 5 mm to 15 mm.

[0110] The length of the box 21 may be less than or equal to the length of the cavity between the glazed walls 27 of the glazing unit 30 in which it is intended to be placed, in the same direction. Preferably, it is less than the length of the cavity in the same direction. The length of the box 21 can be from 1 to 100% of the length of the cavity, for example from 1 to 10%, or from 10 to 20%, or from 20 to 30%, or from 30 to 40%, or from 40 to 50%, or from 50 to 60%, or from 60 to 70%, or from 70 to 80%, or from 80 to 90%, or from 90 to 95%, or from 95 to 100% of the length of the cavity between the glazed walls 27. In some embodiments, the length of the box 21 can be from 5 cm to the length of the cavity between the glazed walls 27 (in the same direction as the length of the box 21). [YES] The upper wall 23 or one of the longitudinal side walls 25 (designed not to be in contact with a glazed surface 27 of the glazing 30 when the enclosure is placed in glazing) comprises a plurality of perforations 26 arranged periodically. Thus, the enclosure 21 according to the invention is also referred to as a "perforated (straight) enclosure" in this text. The perforations 26 are made through the entire thickness of the wall and establish a fluid connection between the chamber of the enclosure 21 and the environment outside the enclosure 21.

[0112] In this third variant, the wall of the enclosure 21 comprising the periodic perforations 26 corresponds to the plate comprising a plurality of periodically arranged perforations of the device described above, and the chamber of the enclosure 21 corresponds to the chamber delimited by the plate described above. Thus, everything described in this text with respect to the perforated plate and with respect to the chamber delimited by the perforated plate applies to the perforated wall of the enclosure 21 and to the chamber of the enclosure, respectively.

[0113] In this variant, the thickness of the chamber inside the box 21 is the distance between the wall of the box including the periodic perforations (the upper wall 23 or one of the longitudinal side walls 25) and the wall opposite this wall.

[0114] Preferably, the box 21 comprises, or is made of, a material such as mentioned above in relation to the perforated plate.

[0115] The device according to the invention can be in several of the variants described above at once. Thus, the device according to the invention can comprise one or more perforated profiles 1 and one or more perforated bars 11; one or more perforated profiles 1 and one or more perforated boxes 21; one or more perforated bars 11 and one or more perforated boxes 21; or one or more perforated profiles 1, one or more perforated bars 11 and one or more perforated boxes 21.

[0116] The device according to the invention may comprise a single perforated plate. In particular, the device according to the invention may comprise a single straight tubular profile 1 having perforations 6 in its upper wall 3, or a single perforated straight strip 11, or a single perforated straight box 21. However, preferably, the device comprises several perforated plates. More particularly, it advantageously comprises several straight tubular profiles 1, each comprising an upper wall 3 having perforations 6 arranged periodically, and / or several straight strips 11 having perforations 16 arranged periodically, and / or several straight boxes 21 having perforations 26 arranged periodically in one of their walls.When the device includes several perforated plates, for example several perforated straight tubular profiles 1 and / or perforated straight bars 11 and / or perforated boxes 21, said perforated plates, perforated straight tubular profiles,. Perforated straight bars and perforated straight boxes can each independently be as described above.

[0117] Preferably, when the device comprises several perforated plates, at least some of them are different from each other, and they may all be different from each other, and / or at least some of the chambers delimited by said perforated plates are different from each other, and they may all be different from each other. In particular, when the device comprises several perforated straight tubular profiles 1, preferably at least some of them are different from each other, and they may all be different from each other. More specifically, they may have perforations 6 with a different periodicity, that is, perforations 6 of different dimensions and / or perforations 6 arranged differently in the upper wall 3 (for example, the distance between the centers of two adjacent perforations 6 may be different).Alternatively, or additionally, they may have an upper wall 3 of a different thickness and / or a chamber 2 of a different thickness. When the device comprises several perforated strips 11, preferably at least some of them are different from each other, and they may all be different from each other. In particular, they may have perforations 16 with a different periodicity, that is, perforations 16 of different dimensions and / or perforations 16 arranged differently (for example, the distance between the centers of two adjacent perforations 16 may be different), and / or have a different thickness.Alternatively, or additionally, at least some of the chambers 12 defined between said perforated strips and the edges of the glazed walls may be different from each other, and they may all be different from each other; in particular, the chambers 12 may have different thicknesses. When the device comprises several perforated rectilinear boxes 21, preferably at least some of them are different from each other, and they may all be different from each other. More specifically, they may have perforations 26 with a different periodicity, that is, perforations 26 of different dimensions and / or perforations 26 arranged differently in the wall (for example, the distance between the centers of two adjacent perforations 26 may be different).Alternatively, or additionally, they may have a wall with perforations of different thickness and / or a chamber 12 of different thickness. Thus, preferably, the. perforated plates (in particular perforated straight tubular profiles 1 and / or perforated straight bars 11 and / or perforated straight boxes 21) and the chambers they delimit are such that at least some, or all, of the perforated plates resonate with the chambers they delimit at different frequencies.

[0118] The device may comprise two or at least two perforated plates (for example, two or at least two perforated straight tubular profiles 1 and / or perforated straight bars 11 and / or perforated straight boxes 21) (as described above), or three or at least three perforated plates (for example, three or at least three perforated straight tubular profiles 1 and / or perforated straight bars 11 and / or perforated straight boxes 21), or four or at least four perforated plates (for example, four or at least four perforated straight tubular profiles 1 and / or perforated straight bars 11 and / or perforated straight boxes 21), or five or at least five perforated plates (for example, five or at least five perforated straight tubular profiles 1 and / or perforated straight bars 11 and / or perforated straight boxes 21 perforated).Preferably, at least two of the perforated plates (for example, at least two of the perforated profiles 1 and / or perforated bars 11 and / or perforated straight boxes 21) have perforations with a different periodicity (i.e., the periodicity of the perforations of one plate (for example, of a profile or bar or box) is different from the periodicity of the perforations of another plate (for example, of another profile or bar or box)), more preferably, at least three of the perforated plates (for example, at least three of the perforated profiles 1 and / or perforated bars 11 and / or perforated boxes 21) have perforations with a different periodicity.

[0119] In a particularly preferred manner, the device according to the invention comprises three perforated plates, and more particularly three perforated straight tubular profiles 1 and / or perforated straight bars 11 and / or perforated straight boxes 21, or at least three perforated plates, more particularly at least three perforated straight tubular profiles 1 and / or perforated straight bars 11 and / or perforated straight boxes 21, and more preferably four (or at least four) perforated plates, and more particularly four (or at least four) perforated straight tubular profiles 1 and / or perforated straight bars 11 and / or perforated straight boxes 21. More preferably, three or at least three of these plates (in particular three or at least three of these profiles 1 and / or bars 11 and / or boxes 21), with the chambers they delimit, are configured to resonate at different frequencies.

[0120] Even more preferably, the system includes at least: - a first perforated plate delimiting a first chamber (in particular a first perforated profile 1 or a first strip 11 or a first box 21), the system constituted by the first perforated plate and the first chamber being configured to resonate at a first frequency, - a second perforated plate delimiting a second chamber (in particular a second perforated profile 1 or a second strip 11 or a second box 21), the system consisting of the second perforated plate and the second chamber being configured to resonate at a second frequency corresponding to one-third of an octave below the first frequency, and - a third perforated plate delimiting a third chamber (in particular a third perforated profile 1 or a third bar 11 or a third box 21), the system consisting of the third perforated plate and the third chamber being configured to resonate at a third frequency corresponding to one-third of an octave above the first frequency

[0121] The device may further include one or more plates (for example one or more profiles, preferably tubular and preferably straight, and / or bars, preferably straight, and / or boxes, preferably straight) without perforations and / or one or more plates (for example one or more profiles, preferably tubular and preferably straight, and / or bars, preferably straight and / or boxes, preferably straight) comprising non-periodic perforations.

[0122] Preferably, the device comprises as many plates (more particularly profiles and / or bars and / or boxes) as the glazed walls of the glazing in which it is intended to be placed have sides, for example it comprises four plates (and more particularly four profiles and / or bars and / or boxes).

[0123] The plates of the device may be disjointed (all or some of them) or may be joined to each other (all or some of them), preferably at their ends. Preferably, when the device according to the invention is a spacing device, all the plates of the spacing device are joined. so as to form a frame. When the plates are joined, they can form a single piece (the plates originating, for example, from a single plate folded in one or more places, for example to form the corners of the frame) or can be joined together by any suitable means, for example, by means of staples, glue, clips, and / or interlocking. In particular, when the device includes profiles, these can be separated (all or some of them) or can be joined to each other (all or some of them), preferably at their ends. Preferably, all the profiles of the device are joined so as to form a frame.When profiles are joined, they can form a single piece (straight profiles, for example, originating from a single profile bent in one or more places, such as to form the corners of the frame) or can be joined together by any suitable means, for example, by the means indicated above. Similarly, when the device comprises straight bars, these can be separated (all or some of them) or joined together (all or some of them), preferably at their ends. Preferably, all the bars of the device are joined to form a frame. When the bars are joined, they can form a single piece or can be joined together by any suitable means, for example, by the means indicated above.In embodiments where the device comprises profiles and bars, the upper walls of the profiles and bars may be joined or disjointed. When the device comprises straight boxes, they are advantageously disjointed.

[0124] When the device comprises several plates, the chambers they delimit (for example the chambers 2 in the profiles 1 of the device and / or the chambers 12 formed between the glazed walls of the glazing extending from the straight bars to the edges of the glazing) can be closed to each other (i.e. they are not directly in fluid communication with each other), for example by the presence of a partition between the chambers, or can be communicating with each other, or some can be closed to each other and others communicating with each other. However, when the plates of the device belong to perforated rectilinear boxes 21, the chambers that they delimit, that is to say the chambers inside said boxes, are closed to each other (that is to say, they are not directly in fluidic communication with each other).

[0125] The invention also relates to glazing comprising a device as described above.

[0126] The glazing according to the invention comprises at least two glazed panels. Advantageously, the glazed panels are parallel or essentially parallel to each other.

[0127] In embodiments, the glazing according to the invention may comprise exactly two glazed walls (it is then called "double glazing"), or exactly three glazed walls (it is then called "triple glazing"), or at least three glazed walls, for example four glazed walls (it is then called "quadruple glazing").

[0128] For the purposes of this invention, a "glazed wall" means any structure comprising (or consisting of) at least one sheet of glass or a glazed assembly. A "glazed assembly" means a multi-layered glazed element, at least one layer of which is a sheet of glass. Thus, glazed walls may, for example, independently comprise a single sheet of glass or a glazed assembly, for example, made of laminated glass (as described in more detail below).

[0129] The glass sheet can be made of organic or mineral glass. It can be made of tempered glass.

[0130] The glazed partitions (or one of the glazed partitions) may comprise (or consist of) a glazed assembly including at least one pane of glass, which may be as described above. The glazed assembly is preferably laminated glass. "Laminated glass" means at least two panes of glass with at least one interlayer film, generally made of viscoelastic plastic, inserted between them. The viscoelastic plastic interlayer film may comprise one or more layers of a viscoelastic polymer such as polyvinyl butyral (PVB) or an ethylene-vinyl acetate (EVA) copolymer, or an ethylene copolymer (corresponding to the definition of an ionomer), more preferably PVB. The interlayer film may be standard PVB or acoustic PVB (such as single-layer or triple-layer acoustic PVB).Acoustic PVB typically consists of three layers: two outer layers of standard PVB and an inner layer of PVB with added plasticizer to make it less rigid than the outer layers. Using glazed walls with laminated glass improves the acoustic insulation of the glazing, and this insulation is further enhanced when the interlayer is made of acoustic PVB. Industrial Zone

[0131] Each glazed panel has two principal faces opposite each other, corresponding to the faces of the glazed panel with the largest surface areas. Advantageously, the glazed panels independently have a thickness (between their two principal faces) greater than or equal to 1.6 mm, for example, a thickness of 1.6 to 24 mm, preferably 2 to 12 mm, and more preferably 4 to 10 mm, for example, 4 or 6 mm. The glazed panels of the glazing according to the invention may all have the same thickness or different thicknesses. The greater the thickness and / or density of the glazed panels, the greater the sound insulation. Furthermore, the thicker the glazed panels, the lower the mass / spring / mass frequency of the glazing.

[0132] Preferably, all the glazed surfaces of the glazing have the same height and width. The glazing according to the invention can have any possible shape, and preferably has a quadrilateral shape, in particular a rectangular or essentially rectangular shape. Alternatively, the glazing can have a circular or essentially circular shape, or an elliptical or essentially elliptical shape, or a trapezoidal or essentially trapezoidal shape.

[0133] The glass walls define a cavity between them. Each of the glass walls defining the cavity includes an inner face corresponding to the main face of the glass wall facing the cavity in question and an outer face corresponding to the second main face of the glass wall, that is to say corresponding to the main face of the glass wall opposite the face facing the cavity.

[0134] Advantageously, the device according to the invention is positioned in the glazing cavity, more particularly in a peripheral zone of the glazing cavity. By "peripheral zone of the cavity", we mean a zone of the cavity adjacent to the edges of the glazed walls and preferably of width (i.e. in a direction orthogonal to the edge of the glazed walls, in the plane of the glazed walls) less than or equal to 20 cm, preferably even less than or equal to 10 cm, preferably even less than or equal to 5 cm.

[0135] Preferably, when the device is a spacing device (in particular, when it comprises one or more perforated profiles and / or perforated strips), the perforated plate(s) of the spacing device are each parallel to an edge of the glazed walls (for example, the perforated straight profile(s) and / or the strips (perforated straight lines are each parallel to an edge of the glass walls). When the device includes one or more perforated boxes, the perforated box(es) are preferably each parallel to an edge of the glass walls.

[0136] Preferably, the device is placed in the glazing cavity such that the chamber delimited by the perforated plate is in fluid communication with the glazing cavity formed between the glazing panes via the perforations in the plate. Thus, preferably, when the device includes at least one perforated profile 1, it is placed in the glazing cavity so that the upper wall 3 of the profile(s) 1 faces the interior of the glazing cavity, with the lower wall 4 of the profile(s) 1 facing outwards and towards the edges of the glazing. Thus, chamber 2 of the perforated profile(s) 1 is in fluid communication with the glazing cavity via the perforations 6 present in the upper wall 3 of said profile(s) 1 (i.e. a fluid, and preferably a gas, can circulate from the glazing cavity to the inside of chamber 2 of profile(s) 1, and vice versa).When the device includes at least one perforated box 21, it is placed in the glazing cavity so that the wall with the periodic perforations 26 either faces the center of the glazing cavity or faces a glazed wall without being in contact with it.

[0137] When the device is a spacing device, the two glass panels are fixed to the spacing device.

[0138] More preferably, when the spacing device includes at least one perforated profile 1, they are fixed to the side walls 5 of the profile(s) 1 of the spacing device, even more preferably their inner face is fixed each to a side wall 5 of the profile(s) 1 of the spacing device.

[0139] When the spacing device includes at least one perforated bar 11, the two glazed walls are preferably fixed to opposite lateral faces of the bar 11.

[0140] Advantageously, the glass panels are attached to the spacing device by bonding, for example by an adhesive, such as a polyisobutylene (PIB) based adhesive, by silicone sealant or by double-sided adhesive tape.

[0141] A sealing gasket may also be present, preferably located on the external face of the spacer device (i.e., the face of the spacer device). the closest to the edge of the glazed walls), which is preferably the outer face of the lower wall 4 of the profile(s) 1 of the spacer (when the spacer includes at least one perforated profile 1). More preferably, the sealant extends from this outer face to the edge of the glazed walls. This sealant can be made with a sealant (called a "sealing sealant") based on polyurethane, polysulfide, and / or silicone. However, when the spacing device includes a perforated bar 11, preferably no sealing gasket is present on said bar.

[0142] The spacing device allows the length of the gap between the glass panes to be fixed. The length of this gap (i.e., the thickness of the cavity between the glass panes) can be from 6 to 30 mm, preferably from 10 to 20 mm, for example 16 mm.

[0143] When the device according to the invention is not a spacer, for example when it comprises one or more perforated boxes 21, said device, and in particular the perforated boxes 21, can be placed on a spacer. More preferably, the lower wall 24 of the box can rest on the spacer. When the length of the box is less than the length of the cavity between the glazed walls, the box 21 can be located anywhere within the peripheral area of ​​the glazing cavity.

[0144] Preferably, the glazing cavity (between the panes of glass) contains a gas. The gas can be air and / or carbon dioxide, and / or argon, and / or krypton, and / or xenon. The use of argon, krypton, or xenon, in addition to or instead of air, improves the thermal insulation of the glazing.

[0145] The glazing according to the invention can be totally opaque, totally transparent, or partly opaque and partly transparent. Preferably, the glazing is at least partly transparent.

[0146] One (or more) of the glazed panels may be tinted throughout their thickness over all or part of their surface. One (or more) of the glazed panels may be covered in whole or in part with an opaque coating, for example, paint and / or enamel. The opaque coating may be present on the inner face of the glazed panel, or on its outer face, or on both faces; preferably, it covers the inner face of the glazed panel. In some embodiments, only one of the glazed panels of the glazing unit is covered with an opaque coating. This glazed panel is advantageously the glazed panel intended to be the outermost glazed panel of the glazing when used in a building facade or exterior window.

[0147] In some embodiments, the glazing surfaces, or at least one of them, may have undergone a treatment to improve the thermal insulation of the glazing. In particular, the glazing surface(s) may include one or more insulating layers, such as a metal and / or metal oxide-based insulating layer, on one or more of their principal faces, preferably on the inner face. When the glazing surface is also coated with an opaque coating (such as enamel and / or paint), an insulating layer compatible with the opaque coating is preferably used. Alternatively, the insulating layer and the opaque coating may be arranged on different faces of the glazing surface (for example, the insulating layer may be on the inner face and the opaque coating on the outer face).Alternatively, when at least one of the glazed walls is a glazed assembly, the insulating layer can be inserted within the glazed assembly, for example between a layer of PVB and a sheet of glass.

[0148] Advantageously, at least one of the perforated plates of the device and the chamber it delimits are such that the assembly consisting of said perforated plate and said chamber resonates at the so-called "mass / spring / mass" frequency of the glazing (for example, at least one of the profiles 1 of the device comprising on its upper wall 3 of the perforations 6 arranged periodically is such that it resonates at the mass / spring / mass frequency of the glazing and / or at least one of the bars 11 comprising perforations 16 arranged periodically and the chamber 12 it delimits are such that they resonate at the mass / spring / mass frequency of the glazing and / or at least one of the boxes 21 comprising perforations 26 arranged periodically is such that it resonates at the mass / spring / mass frequency of the glazing).The presence in the glazing according to the invention of plates (and more particularly of profiles and / or bars and / or boxes) and chambers configured to resonate at the mass / spring / mass frequency of the glazing or at a frequency close to it makes it possible to increase the loss of sound transmission at frequencies close to the mass / spring / mass frequency of the glazing but also at frequencies higher than the mass / spring / mass frequency.

[0149] The mass / spring / mass frequency f mS The thickness of the glazing can be determined by the following formula:

[0150] [Math. 2]

[0152] In equation 2, p0 is the air density in kg / m³ 3 Co is the speed of sound in the air cavity in m / s, d is the thickness of the air cavity between the two glass walls in m and m si and m S2 are respectively the masses per unit area of ​​the first and second glazed walls in kg / m² 2 .

[0153] Preferably, at least one of the perforated plates of the device and the chamber it delimits (more specifically, at least one of the profiles 1 of the device comprising on its upper wall 3 periodically arranged perforations 6 and / or at least one of the bars 11 of the device comprising periodically arranged perforations 16 and the chamber 12 it delimits and / or at least one of the boxes 21 of the device comprising periodically arranged perforations 26) are configured to resonate at a frequency corresponding to one-third of an octave below the mass / spring / mass frequency of the glazing, or at a frequency close to it. This increases the loss of sound transmission at frequencies close to this frequency.

[0154] Preferably, at least one of the perforated plates of the device and the chamber it delimits (more specifically, at least one of the profiles 1 of the device having on its upper wall 3 periodically arranged perforations 6 and / or at least one of the bars 11 of the device having periodically arranged perforations 16 and the chamber 12 it delimits and / or at least one of the boxes 21 of the device having periodically arranged perforations 26) are configured to resonate at a frequency corresponding to one-third of an octave above the mass / spring / mass frequency of the glazing, or at a frequency close to it. This increases the loss of sound transmission at frequencies close to this frequency.

[0155] The presence, in the glazing, of a device comprising at least two perforated plates delimiting a chamber (in particular at least two perforated profiles 1 and / or perforated straight bars 11 and / or perforated straight boxes 21) of which at at least one plate forming with the chamber it delimits a system configured to resonate at the mass / spring / mass frequency of the glazing and at least one other plate forming with the chamber it delimits a system configured to resonate at one-third of an octave higher or lower than the mass / spring / mass frequency of the glazing, and preferably at least three perforated plates delimiting a chamber (in particular at least three perforated profiles 1 and / or perforated straight bars 11 and / or perforated straight boxes 21) of which at least one plate forming with the chamber it delimits a system configured to resonate at the mass / spring / mass frequency of the glazing,at least one other plate, forming with the chamber it delimits a system configured to resonate at one-third of an octave higher than the mass / spring / mass frequency of the glazing, and at least one other plate, forming with the chamber it delimits a system configured to resonate at one-third of an octave lower than the mass / spring / mass frequency of the glazing, allows for smoothing the loss of sound transmission around the mass / spring / mass frequency of the glazing and improving the acoustic insulation of the glazing over a wider frequency band around the mass / spring / mass frequency of the glazing.

[0156] In advantageous embodiments, the glazing according to the invention can exhibit higher sound insulation (determined for example by a measurement of the sound reduction index, in particular according to ISO 10140) than identical glazing but not comprising perforations arranged periodically in the plates of the device, over a frequency range from 200 to 2000 Hz, preferably from 100 Hz to 5000 Hz, preferably still from 50 Hz to 20,000 Hz.

[0157] The glazing according to the invention can be used in any application using glazing. In particular, the glazing according to the invention can be building glazing. The glazing can be intended to interface between the exterior and interior of the building, and can, for example, be facade glazing, window glazing, or door glazing. Alternatively, the glazing can be intended to be placed inside the building.

[0158] The invention also relates to a method for manufacturing glazing as described above, comprising: - the supply of at least two glazed walls; - the provision of a device as described above; - the arrangement of the two glass panels so as to form a cavity between them; and - the introduction of the device into the cavity.

[0159] In a particularly preferred manner, the device is placed in the cavity of the glazing so that the chamber delimited by the perforated plate of the device is in fluidic communication with the cavity of the glazing via the perforations of the plate of the device.

[0160] Preferably, when the device is a spacer, the manufacturing process includes a step of fixing the two glass panes to the spacer. More preferably, when the spacer includes at least one perforated profile 1, the two glass panes are fixed to the spacer such that the upper wall 3 of the profile(s) 1 of the spacer comprising the periodically arranged perforations 6 faces the cavity formed between the glass panes of the glazing.

[0161] Examples

[0162] The following examples illustrate the invention without limiting it.

[0163] Example 1 - Measurement of sound absorption

[0164] The sound absorption of various metallic devices was measured using an impedance tube (Kundt tube) with a diameter of 100 mm.

[0165] Three devices, each comprising five aluminum profiles with a chamber 5.65 mm thick (between their top and bottom walls) and a top wall 0.35 mm thick, were fabricated. In each device, the five profiles were fixed side by side by their lateral faces, with all five profiles arranged in the same orientation (the top walls of the profiles are all in the same principal plane).

[0166] In two of the three devices, perforations were periodically drilled into the upper wall of each profile (along a longitudinal axis of the profile passing through the midpoint of its width); the third device was left without perforations. Apart from the perforations, the three devices are identical.

[0167] The characteristics of the perforations in the three devices are as follows: - device no. 1: perforations of 0.8 mm in diameter, the distance between the centers of two adjacent perforations being 15 mm; - Device no. 2: perforations of 1 mm diameter, the distance between the centers of two adjacent perforations being 30 mm; - Device No. 3: No perforation.

[0168] The sound absorption of each of the three devices tested as a function of frequency was measured according to ISO 10534-2. The results are shown in Figure 4.

[0169] It can be observed that devices #1 and #2 have a higher sound absorption coefficient above a certain frequency. Better absorption of sound energy translates, in glazing, into better sound insulation.

[0170] An absorption peak is observed for device no. 1 at approximately 1200 Hz and an absorption peak for device no. 2 at approximately 1000 Hz. In order to obtain the absorption peaks of the profiles at lower frequencies, the thickness of the chamber can be increased.

[0171] Example 2 - Measuring the sound insulation of glazing

[0172] A first glazing unit according to the invention (glazing unit no. 1) was manufactured. This glazing unit comprises two rectangular panes of monolithic, untempered, unlaminated glass, each having the following dimensions: 1480 mm in length, 1230 mm in width, and 4 mm in thickness. The two panes are fixed to a spacer positioned in a peripheral area of ​​the panes, so as to form a 16 mm thick cavity between them. The cavity of the glazing unit contains air. The spacer unit consists of four profiles forming a frame. Each profile consists of a tube with a rectangular cross-section comprising an upper wall, a lower wall opposite the upper wall, and two side walls connecting the upper and lower walls, to which the panes are fixed. Each profile has a chamber 15 mm thick (between its upper and lower walls) and 16 mm wide.Two of the profiles are 1440 mm long, and the other two are 1165 mm long. The profiles are made of a composite material containing fiberglass and have 1.2 mm thick walls. The top wall of each profile has perforations aligned and periodically spaced along a longitudinal axis of the profile, passing through the midpoint of its width. The perforations have a diameter of 4 mm, and the distance between the centers of two adjacent perforations is 80 mm.

[0173] A second glazing according to the invention (glazing no. 2) was manufactured. This glazing is identical to glazing no. 1 except that the distance between the centers of two adjacent perforations is 110 mm and that the chambers of the profiles include a strip of glass wool, sold by Isover under the trade name Domisol LV, of the same length as the profile in which it is located (i.e. 1440 mm or 1165 mm depending on the profile), of width 15 mm and of thickness 15 mm.

[0174] A comparative double glazing unit (glazing unit no. 3) of type 4(16)4 was also manufactured. This double glazing unit differs from glazing unit no. 1 only in that the profiles do not include any perforations.

[0175] The sound reduction index spectrum (R) of the three glazings was measured as a function of frequency, according to the measurement protocol defined by the ISO 10140 standard.

[0176] The results are shown in Figure 5 and in the table below.

[0177] [Table 1]

[0178] Acoustic indices are determined according to ISO 717-1.

[0179] It has been observed that the presence of periodic perforations in the profiles of the spacing device improves the acoustic performance of the glazing, particularly for frequencies around the mass / spring / mass frequency of the glazing, but also for frequencies above the mass / spring / mass frequency of the glazing, notably for frequencies between 200 and 2000 Hz. This results in an increase in the acoustic R-values. w , RA and RA,H-, for glazing no. 1 and no. 2 compared to comparative glazing no. 3. In addition, the presence of mineral wool in the profiles of the spacing device allows for further improvement of the acoustic insulation of the glazing.

[0180] As mentioned previously, a device according to the invention is also remarkable in that it significantly limits the presence of moisture between the panes of glass in the glazing. Such properties are therefore added to those described above in relation to acoustic insulation, resulting in glazing that performs much better than prior art glazing.

[0181] In its general principle, with regard to aspects related to limiting the presence of moisture between the glass panes of the glazing, the invention consists of equipping the glazing device with desiccant means configured to absorb moisture in the chamber delimited by the plate of said device.

[0182] The term "desiccating agents" classically refers to methods that have the property of drying out the atmosphere in which they are placed, or, in other words, of absorbing all or part of the moisture contained in that atmosphere. The use of such desiccating agents stems from a desire to absorb this moisture before it condenses into water.

[0183] We will now describe different embodiments of the glazing device in which such desiccating means are present. More specifically, these different embodiments aim to describe different configurations / dispositions / arrangements of said desiccating means.

[0184] For the sake of simplicity, the description of these modes is carried out assuming that the glazing device conforms to that described above with reference to Figure 1. Of course, such considerations are not limiting to the invention, and all the modes described below are adaptable without difficulty, according to all technically operative combinations, to the other configurations (bar, box, etc.) described previously.

[0185] Figure 6 schematically represents, from a longitudinal cross-sectional view, a particular embodiment of device 1 of figure 1.

[0186] As illustrated in Figure 6, the device 1, in this embodiment, comprises a porous absorbent material 50 held in a fixed position inside the chamber 2. This porous absorbent material 50 conforms to the characteristics already mentioned. In particular, it is preferably selected from the group consisting of mineral wools, textile fibers, polymer foams, and combinations thereof.

[0187] In particular, the porous absorbent material 50 occupies the entire volume of chamber 2. It is therefore understood that the maintenance in a fixed position of said porous absorbent material 50 results from this configuration within chamber 2.

[0188] Furthermore, in the embodiment of Figure 6, the drying means of device 1 include so-called "internal" drying means which are arranged inside chamber 2. More particularly, said internal drying means include granules 60 integrated, preferably in a non-agglomerated manner (i.e. individually), in the porous absorbent material 50.

[0189] The aforementioned granules 60 are, for example, made of molecular sieve, silica gel, calcium chloride (CaCl), sodium sulfate (NazSO₄), activated carbon, or zeolites with the chemical formulation M2 / nO.Al2O3.xSiO2.yH2O; M being able to be replaced by Ca, Mg, K, Na. In general, any material known to those skilled in the art for making desiccants can be used as granules.

[0190] It is understood that in the embodiment shown in Figure 6, because the porous absorbent material 50 is held fixed in chamber 2, the internal desiccant in the form of granules 60 is also held in a fixed position within it. This advantageously prevents any release of the granules 60 through the perforations 6 in the upper wall 3.

[0191] Furthermore, it is important to note that considering a porous absorbent material 50 occupying the entire volume of chamber 2 is only one implementation variant of the invention. Thus, nothing precludes considering other configurations, such as a configuration in which the porous absorbent material 50 occupies only a portion of the volume of chamber 2 and is held fixed within it by any method known to those skilled in the art, for example, by using suitable adhesives.

[0192] Figure 7 schematically represents, following a longitudinal cross-sectional view, yet another particular embodiment of device 1 of figure 1.

[0193] As illustrated by Figure 7, device 1 comprises a porous absorbing material 50 meeting the same characteristics (in terms of materials from which it can be made) as those described with reference to Figure 6, and occupying the entire volume of chamber 2.

[0194] Unlike the embodiment in Figure 6, in which granules 60 were used, the internal desiccating means here comprise a bar 65 arranged in a cavity 55 of said absorbent material 50.

[0195] There are no limitations on the shape of bar 65. For example, bar 65 can be parallelepiped or cylindrical. In other examples, bar 65 can have a cross-sectional profile in the shape of a rhombus, a star, etc.

[0196] The said bar 65 is made of a solid material, such as for example a material such as those mentioned above with reference to the granules of figure 6, and occupies the entire space delimited by the cavity 55. The placement of my bar 65 in the cavity 55 can be carried out by insertion, or by injection of desiccant material.

[0197] Of course, similarly to what was described with reference to Figure 6, it is entirely possible that the porous absorbent material 50 could occupy only a portion of the volume of chamber 2 and be held fixed within it by any method known to those skilled in the art, for example, by using suitable adhesives. It is also entirely possible that the bar 65 could occupy only a portion of the space enclosed by cavity 55.

[0198] Furthermore, the invention also covers embodiments in which the porous material 50 comprises not only granules 60 but also a cavity 55 within which a bar 65 is housed.

[0199] Figure 8 schematically represents, following a longitudinal cross-sectional view, yet another particular embodiment of device 1 of figure 1.

[0200] As illustrated by Figure 8, device 1 comprises a porous absorbing material 50 meeting the same characteristics (in terms of materials from which it can be made) as those described with reference to Figure 6.

[0201] Furthermore, in this embodiment, the device 1 includes internal desiccating means maintained in a fixed position in the chamber 2 and which comprise two envelopes 70, 80 respectively arranged at opposite ends of the chamber 2, each of said envelopes 70, 80 comprising granules meeting the same characteristics as those described with reference to figure 8.

[0202] Each envelope 70, 80 can be made from a flexible or rigid material, such as paper, plastic, polymer or plant fibers or woven materials. Of course, since each casing 70, 80 and the granules it contains belong to the desiccating means of device 1, said casing 70, 80 is provided with perforations allowing the granules to absorb moisture. These perforations are typically smaller in diameter than the granules so that they cannot escape from the casing 70, 80 that contains them.

[0203] Furthermore, in the embodiment described here with reference to figure 8, the fixed position of said envelopes 70, 80 is maintained by (direct) contact of each of them with the inner wall of chamber 2 and the porous absorbing material 50. To do this, said porous absorbing material 50 occupies all the remaining volume of chamber 2, that is to say the total volume of chamber 2 less the respective volumes of the two envelopes 70, 80.

[0204] The embodiment of Figure 8 can be implemented in numerous variations. For example, the following variations are possible, possibly combined where technically feasible: - the porous absorbent material 50 comprises granules, as already described with reference to Figure 6, and / or a bar 65, as already described with reference to Figure 7, - The porous absorbent material 50 is not in contact with at least one of the two envelopes 70, 80, possibly with both envelopes 70, 80, so as to occupy a volume less than the volume left free by the two envelopes 70, 80 within chamber 2. Therefore, each envelope 70, 80 that is not in contact with the porous absorbent material 50 is held fixed inside chamber 2 by any method known to those skilled in the art, for example, by using suitable adhesives. The fixed positioning of the porous absorbent material 50 is achieved using similar methods. - no porous absorbent material is present in the volume left free by the two envelopes 70, 80 within chamber 2.

[0205] Furthermore, the method shown in Figure 8 has been described so far considering the presence of two envelopes 70 and 80. It should be noted, however, that the number of envelopes is not a limitation of the invention. Thus, nothing precludes considering a single envelope or even more than two envelopes, for example, three envelopes 70, 80, and 90, with two envelopes 70 and 80 respectively arranged at opposite ends of chamber 2, and one envelope 90. arranged in a substantially central manner between the said two envelopes 70, 80, as shown in no way as a limitation in figure 9.

[0206] Finally, regardless of the number of envelopes envisaged, their positioning within chamber 2 does not constitute a limitation of the invention.

[0207] Figure 10 schematically represents, following a longitudinal cross-sectional view, yet another particular embodiment of device 1 of figure 1.

[0208] As illustrated by Figure 10, device 1 comprises a porous absorbing material 50 meeting the same characteristics (in terms of materials from which it can be made) as those described with reference to Figure 6.

[0209] Furthermore, in this embodiment, the device 1 includes internal desiccating means maintained in a fixed position in the chamber 2 and which include a plate 100, called the "absorbent" plate, made of a solid material, such as for example a material such as those mentioned above with reference to the granules in Figure 6. By "plate", we refer here to a rigid element and a (substantially) flat surface.

[0210] More specifically, in the embodiment of Figure 10, the plate 100 extends horizontally over the entire internal surface of the lower wall 4 of the device 1, without occupying the entire volume of the chamber 2. The remaining volume of the chamber 2 is entirely occupied by the porous absorbing material 50. In this way, a stack of a first layer and a second layer, called the "absorbent stack" EMP, is obtained, said two layers being parallel to the perforated plate 3 of the device 1.

[0211] The fact that said EMP absorbing stack occupies the entire internal volume of chamber 2 ensures that it remains in a fixed position.

[0212] The embodiment shown in Figure 10 can be implemented in numerous variations. For example, the following variations are possible, possibly combined where technically feasible: - only absorbent plate 100 is present in chamber 2, no porous absorbent material 50 is used, - the absorbent plate 100 extends horizontally over only a part of the internal surface of the lower wall 4 of the device 1, - the absorbent material porous 50 occupies a smaller volume than the volume left free by the absorbent plate 100, - the porous absorbent material 50 comprises granules, as already described with reference to figure 6, and / or a bar 65, as already described with reference to figure 7.

[0213] Furthermore, the method in Figure 10 has been described so far considering the presence of a single absorbent stack EMP. However, it should be noted that the number of such absorbent stacks does not constitute a limitation of the invention. Thus, nothing precludes considering more than one absorbent stack, for example, two absorbent stacks EMP_1 and EMP_2 superimposed to fill the internal volume of chamber 2, as illustrated, without limitation, in Figure 11. In this example in Figure 11, stack EMP_1 (respectively stack EMP_2) comprises a plate 101 (respectively a plate 102) and a layer of porous absorbent material 51 (respectively a layer of porous absorbent material 52).

[0214] The internal desiccating means have been described so far assuming they are held in a fixed position within chamber 2 of device 1. However, these considerations are not limiting to the invention, as the invention also covers other embodiments in which only a part, or even none, of said internal desiccating means is fixed. These other embodiments are preferably implemented when device 1 is positioned in the lower part of the glazing, so that the internal desiccating means not held in a fixed position cannot escape through the perforations 6 due to gravity.

[0215] Furthermore, it has also been considered until now that device 1 comprised only internal desiccating means. However, nothing precludes considering other embodiments in which the desiccating means of device 1 comprise, solely or in combination with internal desiccating means, desiccating means fixedly arranged outside said chamber 2, referred to as "external desiccating means", in contact with the perforated plate 3 and arranged so as to leave said perforations 6 free.

[0216] As an example, a configuration of this type is schematically illustrated in Figure 12. More specifically, in this example, the drying means comprise only external drying means formed by six bars 111, 112, 113, 114, 115, 116 made of a solid material meeting for example the same characteristics as those described in reference to plate 100 of figure 10.

[0217] The said bars 111, 112, 113, 114, 115, 116 are positioned in contact with the perforated plate 3, each bar being separated from a neighboring bar by a perforation 6. Moreover, each bar is held in a fixed position by any method known to a person skilled in the art, for example by using appropriate adhesive means.

[0218] Of course, considering six bars as external desiccating means is only one possible implementation of the invention. There is nothing to preclude considering a different number of bars, as there are no limitations attached to this aspect.

[0219] Furthermore, considering external drying means in the form of bars does not constitute a limitation of the invention. As such, the external drying means may take any form described above with reference to embodiments in which device 1 includes internal drying means.

Claims

Claims

1. Glazing (10, 20, 30) comprising at least two glazed walls (7, 17, 27) forming a cavity between them, in which the cavity comprises at least one device comprising at least one plate (3, 11, 23), said plate (3, 11, 23) comprising a plurality of perforations (6, 16, 26) arranged periodically and delimiting a chamber (2, 12) arranged in the cavity, the device further comprising desiccant means configured to absorb moisture present in said at least one chamber.

2. Glazing (10, 20, 30) according to claim 1, in which the desiccant means comprise desiccant means arranged inside said at least one chamber, called “internal desiccant means”.

3. Glazing (10, 20, 30) according to claim 2, wherein a porous absorbent material (50) is present inside said at least one chamber (2, 12), preferably selected from the group consisting of mineral wools, textile fibers, polymer foams and combinations thereof, said fixedly arranged internal desiccant means comprising granules (60) integrated in said porous absorbent material and / or a bar (65) arranged in a cavity of said porous absorbent material.

4. Glazing (10, 20, 30) according to any one of claims 2 to 3, in which the internal desiccant means comprise granules gathered in at least one envelope (70, 80, 90).

5. Glazing (10, 20, 30) according to claim 4, wherein at least one envelope (70, 80) is held in a fixed position by contact with an internal wall of said at least one chamber and a porous absorbent material (50) present inside said at least one chamber (2, 12), preferably selected from the group consisting of mineral wools, textile fibers, polymer foams and combinations thereof.

6. Glazing (10, 20, 30) according to any one of claims 4 to 5, in which said at least one envelope comprises: - two envelopes (70, 80) respectively arranged at opposite ends of said at least one chamber, or - three envelopes, including two envelopes (70, 80) respectively arranged at opposite ends of said at least one chamber as well as one envelope (90) arranged substantially centrally between said two envelopes arranged at the ends.

7. Glazing (10, 20, 30) according to any one of claims 2 to 6, in which the internal desiccant means comprise at least one plate (100) made of a solid material, called an “absorbent” plate.

8. Glazing (10, 20, 30) according to claim 7, in which said internal desiccant means comprise a stack (EMP) of a first layer and a second layer, called an "absorbent stack", said two layers being preferably parallel to the perforated plate, the first layer being a said absorbent plate (100) and the second layer being a porous absorbent material (50) present inside said at least one chamber (2, 12), preferably chosen from the group consisting of mineral wools, textile fibers, polymer foams and combinations thereof.

9. Glazing (10, 20, 30) according to claim 8, in which the internal desiccant means comprise a plurality of absorbent stacks (EMP_1, EMP_2).

10. Glazing (10, 20, 30) according to any one of claims 2 to 9, in which all or part of the internal desiccant means are held in a fixed position in said at least one chamber.

11. Glazing (10, 20, 30) according to any one of claims 1 to 10, in which the desiccant means comprise desiccant means (111, 112, 113, 114, 115, 116) arranged fixedly outside said at least one chamber, called "external desiccant means", in contact with the perforated plate of said at least one chamber and arranged so as to leave said perforations free.

12. Glazing (10, 20, 30) according to any one of claims 1 to 11, wherein said at least one perforated plate (3, 11, 23) comprises at least three perforations (6, 16, 26), preferably at least four perforations (6, 16, 26).

13. Glazing (10, 20, 30) according to one of claims 1 to 12, comprising at least two plates (3, 11, 23), preferably at least three plates (3, 11, 23), each comprising a plurality of perforations (6, 16, 26) arranged periodically and delimiting a chamber (2, 12) arranged in the cavity, preferably the periodicities of the perforations (6, 16, 26) of at least two of the plates (3, 11, 23), more preferably of at least three plates (3, 11, 23), are different from each other.

14. Glazing (10, 20, 30) according to one of claims 1 to 13, in which at least one perforated plate (3, 11, 23) and the chamber (2, 12) which it delimits are configured to resonate at a low frequency.

15. Glazing (10, 20, 30) according to one of claims 1 to 14, in which at least one perforated plate (3, 11, 23) and the chamber (2, 12) which it delimits are configured to resonate at the mass / spring / mass frequency of the glazing.

16. Glazing (10, 20, 30) according to claim 15, wherein the device further comprises: - at least one second plate (3, 11, 23) comprising a plurality of perforations (6, 16, 26) arranged periodically and delimiting a second chamber (2, 12) arranged in the cavity, said second plate (3, 11, 23) and chamber (2, 12) being configured to resonate at the third octave frequency lower than the mass / spring / mass frequency of the glazing; and - at least one third plate (3, 11, 23) comprising a plurality of perforations (6, 16, 26) arranged periodically and delimiting a third chamber (2, 12) arranged in the cavity, said third plate (3, 11, 23) and chamber (2, 12) being configured to resonate at the third octave frequency higher than the mass / spring / mass frequency of the glazing.

17. Glazing (10) according to one of claims 1 to 16, in which the device is a spacing device fixed to each of the two glazed walls (7) and comprises: - at least one rectilinear tubular profile (1) comprising an upper wall forming said at least one perforated wall, or - at least one rectilinear bar (11), in which the bar (11) forms said at least one perforated plate.

18. Glazing (10, 20, 30) according to one of claims 1 to 17, in which the device is positioned in a peripheral zone of the cavity of the glazing (10, 20, 30).

19. Glazing (10, 20, 30) according to one of claims 1 to 18, being building glazing, such as facade, window or building door glazing or interior glazing.

20. Glazing (10, 20, 30) according to any one of claims 1 to 19, in which the chamber (2, 12) delimited by the at least one perforated plate (3, 11, 23) is in fluid communication with the cavity of the glazing (10, 20, 30) formed between the glazed walls (7, 17, 27) via the perforations (6, 16, 26) of the perforated plate (3, 11, 23).

21. Glazing (10, 20, 30) according to any one of claims 1 to 20, in which the ratio between the surface area of ​​all the perforations (6, 16, 26) of the at least one perforated plate (3, 11, 23) arranged periodically and the total surface area of ​​the plate is from 0.001% to 8%.

22. Device comprising at least one plate (3, 11, 23), said plate (3, 11, 23) comprising a plurality of perforations (6, 16, 26) arranged periodically, said device being suitable for the manufacture of glazing according to any one of claims 1 to 21.

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