Classifications

• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
  • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
  • C03C17/36—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal
  • C03C17/3602—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer
  • C03C17/3681—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer the multilayer coating being used in glazing, e.g. windows or windscreens
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
  • C03C17/28—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material
  • C03C17/32—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material with synthetic or natural resins
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
  • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
  • C03C17/36—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal
  • C03C17/3602—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer
  • C03C17/3644—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer the metal being silver
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2217/00—Coatings on glass
  • C03C2217/20—Materials for coating a single layer on glass
  • C03C2217/21—Oxides
  • C03C2217/213—SiO2
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2217/00—Coatings on glass
  • C03C2217/20—Materials for coating a single layer on glass
  • C03C2217/25—Metals
  • C03C2217/251—Al, Cu, Mg or noble metals
  • C03C2217/254—Noble metals
  • C03C2217/256—Ag
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2217/00—Coatings on glass
  • C03C2217/70—Properties of coatings
  • C03C2217/73—Anti-reflective coatings with specific characteristics
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2217/00—Coatings on glass
  • C03C2217/70—Properties of coatings
  • C03C2217/77—Coatings having a rough surface
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2218/00—Methods for coating glass
  • C03C2218/30—Aspects of methods for coating glass not covered above
  • C03C2218/32—After-treatment
  • C03C2218/328—Partly or completely removing a coating
  • C03C2218/33—Partly or completely removing a coating by etching

Definitions

• the invention relates to the field of highly transparent and diffusing glazing, in particular for the manufacture of horticultural greenhouses.
• glazings which have both a high light transmission and a strong scattering of incident light (measured by the level of blur, most often called haze according to the English term) are particularly suitable for entering the creation of greenhouses.
• the blur is the ratio between the diffuse transmission and the total transmission of the glazing.
• the strong transmission sought for these glazings is that which is called hemispherical light transmission (TLH, sometimes denoted T H EM), that is to say transmission in the visible range (380-780 nm) averaged over several angles of incidence. For each angle of incidence, the entire light intensity passing through the glazing is measured whatever the angle of emergence.
• T H EM hemispherical light transmission
• Hemispherical transmission is an essential characteristic of this type of glazing for the desired application and it is necessary that the glazing relates to substantially the same TLH after depositing the diffusing texture compared to a non-textured flat glass of the same nature and same mass. surface.
• textured glazings whose texture is obtained by rolling have been well known but used in other technical fields such as photovoltaics.
• the current textured glasses used in photovoltaics are configured to have a very high light transmission compared to the same non-textured glass without generally taking into account scattering effects of the light transmitted by said texturing, which can this time have a negative impact on horticultural production.
• the textured glasses according to the invention are, on the contrary, configured to diffuse the light inside the greenhouse, which implies a positive impact for horticultural production as indicated above. Indeed, the diffusion effect avoids hot spots on the plants and allows better penetration of light in all areas of the greenhouse and ultimately obtaining more homogeneous lighting.
• the applicant company has already developed a textured glass intended more particularly for use in horticultural greenhouses, as described in patent application WO2016 / 170261.
• the texturing of the glazing has thus been adapted to such use, and in particular makes it possible to obtain high blur, while keeping a TLH substantially equal to that of an identical glass but devoid of texture.
• Such glazing does not however describe means making it possible to effectively conserve heat in the greenhouse, in particular during periods of outside cold.
• thermal insulation of greenhouses is also essential for optimizing their performance, whatever the season.
• thermal insulation is generally measured by the heat transfer coefficient U (or K) of the glazing as defined in standard NF EN 673 (201 1) or in the reference publication "Glazing with reinforced thermal insulation, Techniques for the engineer, BE 9 080 ”.
• the object of the present invention is to provide glazing which meets such specifications and such a need.
• the present invention relates to a glazing unit comprising a glass substrate on which is deposited in succession, from a first surface of said substrate:
• a first coating comprising a layer having properties of reflection of the infrared, very particularly whose wavelength is between 3 and 50 micrometers, or a set of layers of which at least one layer has properties of reflection of l infrared, a second coating above said first coating, comprising an organic or mineral layer, said second coating having a relief texture, said texture being such that the average slope P m of said textured face is less than or equal to 15 ° and the percentage of the surface having a slope greater than 5 ° is greater than 5%, preferably greater than or equal to 10%.
• the second coating is advantageously textured on the surface (or the face) opposite its surface in contact with said first coating.
• infrared radiation is meant in the sense of the present invention radiation of wavelength between 1 and 50 micrometers. According to preferred but not limiting embodiments of the present invention:
• the mean slope P m of the textured face is less than 12 ° and more preferably is less than 10 °, or even less than 8 °, or even very preferably is less than 6 °,
• the average slope P m of the textured face is greater than 1 ° and more preferably is greater than 2 °, or even greater than 3 °,
• the percentage of the surface with a slope less than or equal to 5 ° is as large as possible (ideal value of 100%) but can however, and without departing from the scope of the invention, also be less than 100%, even less than 90% or even less than 80%, 70% or 60%.
• the blur as measured at an angle of 2.5 °, is greater than 10%, even greater than 15%, greater than 20%, or even greater than 30%, or even greater than 40%. According to an advantageous embodiment, the blurring is greater than 50%, or even greater than 60% or even greater than 80%. According to the invention, the blur is as large as possible (ideal value of 100%) but can be less than 100%, even less than 90%, or even less than 85% without departing from the scope of the invention.
• the ratio between the hemispherical light transmission (TLH) of the glazing comprising the second coating and the TLH of the glazing before the deposition of the second coating is greater than 0.8, more preferably is greater than 0.9, and very preferably is greater than 0.95. Ideally this ratio is substantially equal to 1.
• the glass substrate is a non-textured glass on the face comprising said first and second coatings.
• the glass substrate is a float glass whose initial surface has not undergone any texturing treatment or aimed at accentuating the roughness, before the deposition of the first coating.
• the layer (s) exhibiting infrared reflection properties in the first coating is silver-based.
• the first coating consists of a stack comprising at least one silver-based layer and dielectric layers.
• the first coating has a thickness of between 5 nanometers and 1 micrometer, in particular between 20 and 500 nm.
• the second textured coating is an organic layer.
• the organic layer may in particular consist of a polymer chosen from a chlorinated polyvinyl diene, a styrene-butadiene copolymer, a polyacrylonitrile, a polymethacrylonitrile or also a polycycloolefin or a polypropylene.
• the second textured coating is a layer of a mineral material, said mineral material preferably being chosen from oxides or nitrides.
• the textured coating may in particular be a layer based on silicon oxide.
• the refractive index of the material constituting the texture is in the range from 1.40 to 1.80 to 587 nm, preferably ranging from 1.40 to 1.65 to 587 nm.
• the average thickness of the second coating is between 1 and 50 micrometers, preferably between 1 and 10 micrometers.
• the roughness of the textured surface of the second coating is such that its average R sm is between 10 and 100 micrometers.
• the roughness of the textured surface of the second coating is such that its average R a is between 0.5 and 5 micrometers.
• the texture includes contiguous patterns of size in the range from 10 to 100 micrometers.
• Said glazing further comprises an anti-reflection coating on one or both of its faces.
• the second main face of the glazing also has a texture, identical or different from that printed on the second coating.
• the texture of the second main face can advantageously take up all of the characteristics described above, in particular an average slope Pm of the textured face less than or equal to 15 ° and a percentage of the textured surface having a slope greater than 5 ° greater than 5%.
• the invention also relates to a horticultural greenhouse equipped with at least one glazing as previously described.
• the invention relates to a first method of manufacturing such glazing which comprises the following steps:
• a first coating comprising a layer having infrared reflection properties or a set of layers at least one layer of which has infrared reflection properties, preferably by sputtering, said layer preferably being silver-based,
• a second coating consisting of a mineral layer having a thickness in particular between 1 and 30 micrometers, texturing of said second coating, in particular by an embossing, rolling or acid attack process, preferably by a rolling process,
• An alternative method of manufacturing a glazing unit according to the invention comprises the following steps:
• a first coating comprising a layer having infrared reflection properties or a set of layers at least one layer of which has infrared reflection properties, preferably by sputtering, said layer preferably being silver-based,
• a glass matrix which is not very absorbent such as Diamant® glass or Albarino® glass sold by the applicant company, is used as substrate.
• a glass is used whose TLH is greater than 78%, preferably greater than 79%, or even greater than 80%.
• the level of blurring of the glazing according to the invention is preferably greater than 50%, preferably greater than 60%, more preferably still greater than 70% , or even more than 80%.
• the measurement can in particular be carried out according to the principles described in standard ISO 13468 (illuminant D65).
• the TLH is measured according to the methods detailed in the article “Transvision: A light transmission measurement System for greenhouse covering materials” published in the acts of “Proc 7th IS on light in Horticultural Systems, Eds: S. Hemming and E. Heuvelink, Acta Hort.956, ISHS 2012 ”.
• the textured surface of the glazing according to the invention allows the diffusion of light, the surface having an average slope P m of a few degrees, that is to say typically less than or equal to 15 ° in the sense described above.
• the measurement of a blur level at an angle of 2.5 ° means that the blur level is measured by the ratio between:
• FIG. 1 A diagram allowing a better understanding of the measurement of the blur according to the invention has been transferred to FIG. 1 attached for purely illustrative purposes.
• the slope at a point A of the textured surface of the glazing corresponds to the angle alpha (a) formed between the tangent plane at this point and the general plane of the support sheet (here the face of the glass substrate).
• the measurement of the slope at point A is carried out from the measurement of the variation in height in the vicinity of this point and with respect to the general plane of the sheet.
• the devices or profilometers
• the measurements were carried out in the context of the present invention using a MIME profilometer, using chromatic confocal technology.
• the measurement of the average slope P m of the surface and the percentage of the surface having a slope greater than 5 ° is determined from the measurement of slopes at points distributed over a square mesh of period 1 micrometer. We then calculate the average of the slope of all these points. On the basis of the same measurement of the texture profile of the second coating, it is also possible to calculate the percentage of the surface having a slope greater than 5 °.
• the textured surface according to the invention allows in particular the diffusion of light and the appearance of blur, the surface having in this regard an average slope Pm of a few degrees, that is to say equal to or less than 15 °.
• patterns are preferably produced whose size is of the order of 10 to 100 micrometers. Through size means the diameter of the smallest circle containing the pattern. Preferably the patterns are joined.
• the Rs m (average period or not average) of a profile (that is to say along a straight line) of a surface is defined by the relation: in which S, is the distance between two zero crossings (center line) and amounts, n + 1 being the number of zero crossings going up in the profile considered.
• S is the distance between two zero crossings (center line) and amounts, n + 1 being the number of zero crossings going up in the profile considered.
• R Sm is representative of the distance between peaks, that is to say of the pitch of the texture parallel to the general plane of the sheet.
• the values of Rs m are given after using Gaussian filters with cutoffs (or basic length, cut-off in English) at 0.8 micrometers and 250 micrometers (elimination of the periods less than 0.8 micrometers and greater than 250 micrometers) .
• the measurements of R sm are carried out over a distance of at least 1250 micrometers.
• the R sm around said point corresponds to the arithmetic mean of the R sm for 10 profiles starting in star starting from the point considered.
• the R sm around a point we remove the values greater than or equal to 1250 micrometers. This avoids taking into account profiles in certain guidelines of particular textures such as that of parallel prisms or straight lines between aligned pyramids (value of R sm infinite or non-calculable).
• We define the mean R sm of a textured surface by calculating the arithmetic mean of the R sm around a point, the points being chosen on a square grid with a pitch of 5 cm.
• the average R sm of the textured surface is included in the range from 10 micrometers to 100 micrometers and preferably in the range ranging from 20 to 80 micrometers and even in the range ranging from 30 micrometers to 70 micrometers or even in the range from 40 micrometers to 60 micrometers. More preferably, the R sm around any point on the textured surface is in the range from 10 micrometers to 100 micrometers and preferably in the range from 20 to 80 micrometers and even in the range from 30 micrometers to 70 micrometers or even in the range from 40 micrometers to 60 micrometers.
• the texture patterns can be parallel linear patterns like parallel prisms or be patterns that can fit in a circle like cones or pyramids.
• the patterns of the texture for example have an average depth (or average height) of between approximately 0.5 and 3 micrometers, on the basis of the same measurement conditions as described above and according to standard IS04287 (1997).
• the first coating according to the invention comprising at least one layer having infrared reflection properties, in particular thermal reflection (that is to say between 3 and 50 micrometers) or a set of layers of which at least one layer has reflective properties of infrared, especially thermal. It is preferably made up of a stack of layers comprising at least one silver-based layer and preferably at least two or even three layers of silver, separated by layers of dielectric materials.
• the normal emissivity of said first coating (that is to say of the surface of a glazing unit coated with such a coating), in the sense described in standard EN 12898 (2001), is preferably less than 0.15, more preferably less than 0.1 and very preferably less than 0.05.
• Said first stack also comprises layers of dielectric materials whose indices, location in the succession of layers and thicknesses are optimized to give the glazing an optimal TLH, that is to say maximum, according to techniques well known in the art. the domain. Its thickness varies from a few nanometers) to a few hundred nanometers, for example between 10 and 300 nanometers.
• the heat transfer coefficient U of the single glazing according to the invention is generally less than 4 W / m 2 .K, and preferably less than 3.5 W / m 2 .K.
• the second coating can be, according to the invention, of organic or mineral nature.
• this coating is organic in nature.
• This coating can advantageously be a polymer.
• the material chosen is, for example, a polymer chosen from PVDC (chlorinated polyvinyldiene) as described in application WO2016 / 097599, a styrene-butadiene copolymer as described in application WO2017 / 103465, polyacrylonitrile ( PAN) or polymethacrylonitrile (PMAN) as described in application WO2013 / 089185 or else polycycloolefin or polypropylene, or in general, any polymer sufficiently mechanically and chemically resistant to preserve the first underlying stack and in particular the reflective layers infrared of such stacks, in particular the layer or layers based on silver.
• PVDC chlorinated polyvinyldiene
• PAN polyacrylonitrile
• PMAN polymethacrylonitrile
• the polymer is advantageously chosen to be transparent in the visible range (380-780 nm) and preferably also transparent in the near infrared (780-2500 nm).
• Said coating is according to the invention advantageously little or not absorbent in the thermal infrared field (that is to say of wavelength between 3 and 50 microns).
• the coating is mineral in nature.
• Such a coating may for example be based on silicon oxide, in particular obtained by a sol-gel process then heating or any other dielectric mineral compound transparent in the visible range (380-780 nm) and preferably also transparent in the near infrared (780-2500 nm).
• Said coating is according to the invention advantageously little or not absorbent in the thermal infrared field (that is to say of wavelength between 3 and 50 microns).
• the thickness of the second coating is preferably less than 10 micrometers, and more preferably less than 5 micrometers. In particular in the case where the second coating is of mineral nature, its thickness may even be less than 3 micrometers or even less than 2 micrometers.
• Such a texture of the second organic or mineral protective coating can be obtained by any known means, in particular by embossing, by lamination, by etching (in particular by means of a pre-printed roller), by thermoforming, by embossing, or even by etching. acid.
• the texture is obtained by etching the surface of said second coating by means of a roller, the patterns of which are printed in negative, with possibly a step of heating its surface until reaching a softening temperature at least on the surface. of said second coating or alternatively to densify said coating (in particular in the case of a sol-gel layer).
• the glazing may also include one or more anti-reflective layers to increase light transmission (TLH).
• the anti-reflective coating can be deposited on one or both sides of the glazing, and in particular on the non-textured side. This anti-reflective effect can be obtained by depositing a layer or several layers forming a stack, by chemical attack or any other suitable technique.
• the anti-reflection effect is chosen to be effective at wavelengths 400-700 nm.
• An anti-reflection coating (anti-reflection layer or stack of anti-reflection effect layers) generally has a thickness in the range from 10 to 500 nm.
• Such antireflection layers are in particular advantageously chosen from layers of porous silicon oxide, in particular of the type of those described in the publication WO2008 / 059170.
• the invention is useful for acting as glazing allowing light to pass through greenhouses for horticulture, as well as for other applications requiring a high TLH and significant blurring such as a horticultural greenhouse but also a veranda, a reception hall. , a public space.
• FIG. 1 describes an example of a glazing according to the invention:
• the glazing comprises a transparent substrate 1, the TLH light transmission of which is greater than 80%, in particular greater than 82% or even greater than 83%. It is in particular an extra-clear float glass marketed by the applicant company under the reference Diamant®.
• an anti-reflective coating 2 of any known type is deposited, in particular based on porous silicon oxide.
• a first coating 3 called “low-e” and comprising at least one layer reflecting infrared, in particular thermal infrared, in particular a layer based on silver.
• the stack has a normal emissivity of less than 0.1, or even less than 0.05.
• This first coating is chosen, on the one hand, to impart thermal insulation properties to the glazing, without substantially reducing the TLH, according to the principles described above.
• a second protective coating 4 based on mineral or organic as described above, is present above the first coating, with reference to the surface of the substrate.
• This protective layer has on the opposite surface (face) a texturing 5 specifically adapted to bring the level of blurring to a value at least equal to 10% and preferably greater than 50%, in the sense described above, while retaining a value TLH equal to at least 80% and preferably equal to at least 85%, or even 90% of the initial value of the glazing (provided with the first coating) before the deposition of this second protective coating.
• Glazing is thus obtained which has both good thermal insulation properties and a high level of haze, while retaining a high TLH light transmission and ultimately a glazing which is perfectly suited for use in a horticultural greenhouse.
• a glazing is printed by rolling as described above and comprising:
• a first coating consisting of an Eclaz II ® stack based on silver marketed by the company Saint-Gobain Glass France,
• the heat transfer coefficient U of the glazing according to the invention is 3.4 W / m 2 .K, while it was 5.8 W / m 2 .K for the bare substrate.
• the blur level is around 60%, which ensures optimal light distribution in the greenhouse.
• an extra-clear float substrate for example a diamond® substrate from the applicant company
• a first coating having infrared reflection properties known in the field under the name "low-e”
• This stack of layers comprises at least one layer based on silver, preferably in silver, and the stack is configured in such a way that the TLH of the substrate-first coating assembly is maximized. More preferably, the stack is configured to minimize the value of the heat transfer coefficient U, in particular by the selection of a stack whose normal emissivity value is minimal, in the sense described above.
• the selected low-e stack is of the “quenching” type, and furthermore does not exhibit any significant variation in its colorimetry during the toughening of the glazing.
• a temporary protective coating is applied to the coating with infrared reflection properties.
• This layer is for example deposited by the liquid route and is for example from a composition based on methacrylates (easypro layer) as described in application WO2015 / 019022.
• a second step which can in particular be carried out by resuming the glazing obtained according to the preceding step, for example on another site, the glass is cut to the desired size, the anti-reflective layer (or precursor of said layer, in particular) is deposited a silica gel according to a process called “wet deposition”) on the opposite face in accordance with the embodiment already described in connection with FIG. 1.
• the glazing is quenched under the usual conditions (for example heating at 620 ° C. for 5 minutes then rapid cooling).
• the anti-reflective layer becomes porous and the low-e stack achieves the desired properties.
• a permanent protective coating of the low-e stack is deposited immediately after the tempering step by means of a roller having the texture required to give the glazing a relief generating haze without substantially reducing the TLH, with possibly a intermediate or final baking to harden the material.
• the material chosen is, for example, a polymer chosen from PVDC (chlorinated polyvinyldiene) as described in application WO2016 / 097599, a styrene-butadiene copolymer as described in application WO2017 / 103465, polyacrylonitrile (PAN) or polymethacrylonitrile (PMAN ) as described in application WO2013 / 089185 or else polycycloolefin or polypropylene.
• PVDC chlorinated polyvinyldiene
• PAN polyacrylonitrile
• PMAN polymethacrylonitrile
• a permanent protective coating is directly applied to the coating with infrared reflection properties.
• This layer is, for example, a sol-gel silica layer deposited by the liquid route which is then polymerized and subjected to a hardening treatment by heat treatment, then (or at the same time) textured according to conventional techniques of printing by etching.
• This protective layer is transparent to IR thermal, hardenable and has the texture required to give the glazing a relief generating haze without substantially reducing the TLH.
• a third step which can in particular be carried out by resuming the glazing obtained according to the preceding step, for example on another site, the glass is cut to the desired size, the anti-reflective layer is deposited (for example made of porous silica such as described in publication W02008 / 059170 on the opposite face in accordance with the embodiment already described in connection with FIG. 1 and the glazing is quenched under the usual conditions The anti-reflective layer becomes porous and the low-e stack reaches the properties wanted.
• a glazing unit is obtained according to the invention and capable of being advantageously used in horticultural greenhouses.

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• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Laminated Bodies (AREA)
• Surface Treatment Of Glass (AREA)
• Greenhouses (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2018
  • 2018-08-31 FR FR1857831A patent/FR3085372B1/fr not_active Expired - Fee Related
• 2019
  • 2019-08-02 US US17/269,458 patent/US20210253472A1/en not_active Abandoned
  • 2019-08-02 WO PCT/FR2019/051897 patent/WO2020043973A1/fr unknown
  • 2019-08-02 EP EP19765778.6A patent/EP3844119A1/de not_active Withdrawn
  • 2019-08-02 CA CA3107964A patent/CA3107964A1/fr not_active Abandoned

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