EP3344838A1

EP3344838A1 - Door for a refrigerated cabinet

Info

Publication number: EP3344838A1
Application number: EP16754288.5A
Authority: EP
Inventors: M. Nicolas BOUCHER; Olivier Bouesnard; Pierre Schneider
Original assignee: AGC Glass Europe SA
Current assignee: AGC Glass Europe SA
Priority date: 2015-09-03
Filing date: 2016-08-22
Publication date: 2018-07-11
Anticipated expiration: 2036-08-22
Also published as: EP3344838B1; WO2017036832A1; BR112018003976B1; EP3699383A1; ES2789356T3; DE202016009074U1; JP2018535379A; CN111743354A; DE112016001081T5; EP3699383B1; DE202016008432U1; US20180252022A1; PL3344838T3; CN108474235A; US11156030B2; JP6833824B2; BR112018003976A2

Abstract

Door for a refrigerated cabinet, formed by multiple glazings that join a spacer frame, peripheral joints, and a reinforcement that makes it possible to do away with frame elements. The door comprises transparent vertical joints that connect the glass sheets of the glazing to transparent spacers.

Description

Refrigerated cabinet furniture door

1. Field of the invention

The field of the invention is that of doors for refrigerated cabinet furniture comprising insulating glass elements. These doors can be used in applications such as refrigerator doors and freezer doors.

2. Solutions of the prior art

Refrigerated cabinet furniture, also known as refrigerated furniture, used in most commercial premises to offer for sale and / or for consumption products that must be kept at temperatures below 10 ° C, such as foodstuffs, is often equipped with glazed elements that turns it into a refrigerated sales cabinet. These furniture allow the visualization of the products by the consumer / customer and in particular a self-service use while keeping the products at a specific temperature. Refrigerated furniture thus represents the last link in the food cold chain before the product is in the possession of the consumer. The development of products and especially food is essential, but this should not be at the expense of the quality of their conservation. In other words, the refrigerated cabinet is used to present and / or expose the products in a useful volume at a specific storage temperature (generally less than 10 ° C).

Thus, the exposure of products and more particularly of foodstuffs has a primordial role in the sale of these products. Good exposure includes good visual access to the products contained in the refrigerated cabinet without having to open it. However, during exposure, the refrigerated cabinet must maintain a certain temperature and ensure the preservation of the products that are to be cooled or frozen. Thus, the furniture should at least protect the products against thermal aggressions of all kinds, such as closing and opening doors. From a technical point of view, the roles of exposure and preservation of the products at a certain temperature in refrigerated cabinets are totally contradictory since the consumer must be able to dispose of the products contained in the refrigerated cabinet while benefiting from furniture. of refrigerated enclosure with wide opening and strong lighting, and the trader must ensure a quality of preservation of the products with the imperative of closing or reducing the openings of the furniture to the maximum, the least possible lighting and more particularly the least of heat exchange with the atmosphere of the store.

Thus, several solutions have been envisaged to improve the thermal insulation performance of these glazed elements used for refrigerated cabinet furniture, such as the use of multiple glazing. However, the use of such multiple glazing in refrigerated cabinet furniture doors, because of their weight, generally requires the use of robust chassis. If these glazed elements and in particular their chassis ensure their mechanical role, they sin by a large space as well as visual clutter. To ensure their mechanical role, the materials used to make the frames are usually of a metal nature inducing a thermal bridge between the inside and the outside of the refrigerating cabinet. This thermal bridge can cause the appearance of condensation on the frame and the door on the outside of the refrigerating cabinet.

Thus, GB2162228 discloses a double glazing for showcase consisting of two glass sheets maintained in parallel position and spaced apart by spacers arranged between these sheets. The spacers contain a drying material and are formed in whole or in part of transparent resinous material to allow good visibility of the merchandise maintained in the showcase and to prevent the formation of condensation on the inner surfaces of the glass sheets. GB2162228 does not deal with the problem of reducing the visual and spatial clutter of the frame associated with the double glazing.

The patent application WO2014009244 A1 discloses a refrigerated furniture door comprising at least two glasses surrounded by frame members on the horizontal and / or vertical edges. The frame elements generate visual clutter and are also a thermal bridge between the inside and the outside of the cabinet.

3. OBJECTIVES OF THE INVENTION The object of the invention is notably to overcome these disadvantages of the prior art.

More specifically, an object of the invention, in at least one of its embodiments, is to provide a refrigerated cabinet furniture door that can be fixed securely and easily to the refrigerated cabinet. Another object of the invention, in at least one of its embodiments, is to provide a door for a refrigerated cabinet which makes it possible to maintain the required temperature inside the refrigerated cabinet while decreasing the temperature. energy consumption to ensure efficient preservation of the products contained in the refrigerated cabinet. The invention also aims to provide a refrigerator cabinet door meets the thermal insulation criteria of these types of furniture and offering an easy to implement and economically advantageous. Thus, the use of transparent materials of the polymer type and the elimination of metal frame elements associated with the glazed elements make it possible to propose a solution that is efficient from the point of view of thermal insulation. The invention also aims to provide such a door that optimizes the role of exposure of the products contained in the refrigerated cabinet speaker while maintaining energy efficiency. Indeed, the use of transparent elements makes it possible to propose a solution without visual interruption which would be due to an opaque vertical joint and / or an opaque vertical frame. Visualization of products for sale is improved.

The invention also aims to provide a refrigerated cabinet furniture door meeting the mechanical strength criteria of these types of furniture. Thus, the mechanical elements including the opening of the door are incorporated directly into the glazing and replace the frame elements surrounding the known glazing. Another advantage lies in the fact that, from the mechanical point of view, the refrigerated cabinet door according to the invention is capable of withstanding also significant mechanical forces such as several hundreds of thousands of opening / closing cycles. without requiring the use of frame elements present in combination with the glazing of a traditional door.

The invention also aims to be implemented on refrigerated furniture already in service to enable them to meet the current energy efficiency criteria of this type of furniture via an easy and economically advantageous implementation of the invention.

4. Presentation of the invention

The invention relates to a refrigerated cabinet furniture door comprising: a. at least one insulating multiple glazing consisting of at least a first and a second glass sheet associated with each other via a spacer frame which holds them at a distance from one another; a certain distance from each other, said frame extending along the horizontal and vertical edges of the glazing, b. between said at least two glass sheets, at least one internal space, comprising a blade of an insulating gas, closed by at least a first and a second peripheral seals on the horizontal edges and at least one peripheral seal on the vertical edges, said peripheral seals being arranged around said internal space, the intermediate frame comprising at least two vertical spacers and at least two horizontal spacers, at least one vertical spacer being made of transparent resin, at least one vertical peripheral seal being transparent, the horizontal spacers being compounds of at least one profile, according to which a) the spacers are interconnected to form said spacer frame,

b) at least one fastening system solidarisant the door with the speaker cabinet is at least partially inserted in at least one horizontal peripheral seal,

c) the door comprises a reinforcement, secured to the fastening system and inserted at least partially into at least one horizontal peripheral seal,

d) the intermediate frame the peripheral joints and reinforcement replace the frame of a traditional door and fulfill its functions. The general principle of the invention is based on the implementation and the combination of a spacer frame, peripheral seals and a reinforcement that make it possible to do without the frame element of traditional doors and to fulfill their functions which are : possible opening and maintenance of the glazing. According to the invention, the term door means to designate a system of opening / closing the furniture and by extension, the opening part of the furniture only. The system may equally include rotational, rectilinear, or a combination of both.

A traditional door is a door comprising a frame and a glazing. The frame includes all or part of the periphery of the glazing, it consists of frame elements providing the functions of opening, maintaining and supporting the glazing.

The refrigerated enclosure designates a closed space delimited in part by the door and in which there is a temperature below the temperature of the environment around the cabinet.

By multiple glazing, is meant a glazing comprising at least two sheets of glass. Preferably, the multiple glazing is double glazing or triple glazing. More preferably, it is a double glazing comprising two sheets of glass. The glass of the glass sheets is a glass of the category of soda-silico-calcium glasses well known in window applications. The thickness of the glass sheets is generally in the range of 0.5 to 15 mm. In the case of triple glazing, the central sheet generally has a thickness less than the other two. By insulating multiple glazing, is meant a multiple glazing limiting the heat exchange between the refrigerated chamber and the atmosphere around the furniture. According to the invention, the glass sheets are associated with each other via an intermediate frame. The spacer frame designates a rigid member disposed between the glass sheets, which holds them at a distance and extends along the horizontal and vertical edges of the glazing. The intermediate frame also has the function of contributing to the stiffening of the door. The intermediate frame according to the door according to the invention has the form of a quadrilateral, preferably a parallelogram. More preferably still, the quadrilateral is a rectangle or a square.

By the vertical and horizontal adjectives, it is meant locations close to opposite edges, that is to say non-contiguous edges of the frame and / or glazing and facing each other.

According to the invention, the door comprises between the glass sheets, an internal space. The internal space is bordered by the spacer frame and filled with a gas blade. The gas of the internal space is an inert gas capable of thermally isolating the glazing. A suitable inert gas is chosen for its lack of toxicity to living beings, of corrosive character vis-à-vis the glass, flammable and sensitivity to UV radiation. Such a gas is generally chosen from air, argon, xenon, krypton and their mixtures. Most often, air, argon or a mixture of air and argon will be used. According to a preferred embodiment of the invention, the internal space comprises a blade of an insulating gas comprising at least 85% argon.

In the door according to the invention, peripheral joints are seals arranged around the internal space, provide sealing and contribute to the mechanical strength of the door. At least a first and a second peripheral seal are located on the horizontal edges of the door. The first of these two joints is always a double joint connecting the horizontal spacer to each sheet of glass. Likewise, at least one peripheral seal is located on the vertical edges. This latter seal is also a double seal connecting the vertical spacer to each sheet of glass. At least one vertical spacer of the spacer frame is formed from a transparent resin. The term transparent means a property illustrating the percentage T _L (light transmission) of visible light transmitted through the glazing in the visible spectrum of at least 1%. Preferably, transparent refers to a property of T _L of at least 10%. Ideally, transparent means a T _L of at least 50%.

At least one peripheral seal on at least one vertical edge is also transparent.

The horizontal spacers are composed of at least one profile. By profile is meant an object of elongated shape and constant section. The profile is generally made of metal, polymer, ceramic or composite material (combination of at least two different materials). The profile is preferably a solid profile and is composed mainly of a polymer matrix. Desiccant material can be integrated into the polymer matrix. An example of such a desiccant polymer is a polymer comprising an integrated molecular sieve.

It is also possible to use hollow sections In this case, the desiccant material fills, at least partially, the hollow space. Examples of desiccants capable of filling the hollow space are silica gels and molecular sieves.

In the door according to the invention, the spacer frame is composed of at least two vertical spacers and at least two horizontal spacers.

At least one fastening system secures the door according to the invention with the refrigerated cabinet and is at least partially inserted into at least one horizontal peripheral seal. The fastening system is a device that allows the fastening of the door with the speaker cabinet. According to the invention, the fastening system is composed of at least one screw of different function from that of the spacer frame described below. According to a particular embodiment of the invention, the fastening system is composed of two screws, a plate equipped with a pivot and drilled with two holes in which the two screws are inserted. Preferably, the fastening system also comprises a self-closing system and a system limiting the opening of the door.

The door comprises a reinforcement, secured to the fastening system and inserted at least partially into at least one horizontal peripheral seal. Reinforcement means a mechanical element whose function is to take back at least part of the mechanical stresses induced by the weight of the door and the opening and closing forces thereof. Reinforcement of the door according to the invention is generally in the form of a profile, distinct from the profile used for horizontal spacers. The section of this profile may generally be U or L. The material of the profile may be a metal, a polymer or a composite material. Examples of fastening are screws, clips, welds, collages and snap fasteners.

In the door according to the invention, the spacer frame, the peripheral seals and the reinforcement replace the frame of the traditional doors and also fulfill its functions.

According to a first particular embodiment of the invention, the vertical spacers of the intermediate frame of the door are connected to the horizontal spacers by means of a stiffening element. Generally speaking, by rigidification element, it is necessary to understand the combination of at least one metallic, polymeric, ceramic or composite material part with a pressure device, an adhesive, an ankle, a screw, or any other means. ensuring the connection between said spacers. In certain variants of this first embodiment, the stiffening element comprises the combination of a metal part, polymeric, ceramic or composite material with a means ensuring the connection with the spacers. In other variants of this first mode embodiment, the stiffening element comprises the combination of a metal part, polymeric, ceramic or composite material with a plurality of means ensuring the connection with the spacers.

The adhesive may be selected from crosslinkable acrylic polymer adhesives, crosslinkable epoxy adhesives, double-sided acrylic polymer adhesive tapes, and polyisobutylene adhesives. The screw can be made of steel, galvanized steel, stainless steel or bronze. According to a particular embodiment of the invention, the stiffening element is formed of a profile of nature and / or shape different from the horizontal spacer. Another variant is still to combine the horizontal spacer with pieces of sections arranged discontinuously forming pads that make up the stiffening element.

According to a variant of this first embodiment, the stiffening element is composed of at least one piece which is secured to at least one reinforcement. By the word "solidarized" is meant an assembly that does not allow any degree of freedom between the two parts. Examples of fastening are screws, clips, welds, collages and snap fasteners. Preferably, the fastening will be done using screws or collages.

According to this variant of the first embodiment, the reinforcement can even extend along the horizontal spacer and serve itself as stiffening element. The reinforcement is then a section of square or rectangular section which is secured to the horizontal spacer by a bonding, a pressure system, a weld, a clip or any other element allowing this joining.

According to a second variant of the first embodiment of the invention, the stiffening element is in contact with at least the second horizontal peripheral seal. According to the concrete form adopted for the stiffening element, the placing in contact is carried out on only one part or on the the entire outer surface of this element. For example, in the case of a section of square or rectangular section, it may be immersed completely in the second horizontal peripheral seal.

According to a second particular embodiment of the invention, compatible with the first embodiment, the fastening system emerges from the horizontal peripheral seal and extends into at least one of the following parts:

• a stiffening element,

• a horizontal spacer.

Preferably, a second screw forming part of the fastening system passes through the second horizontal peripheral seal and the reinforcement, and extends into the stiffening element having a shape suitable for receiving the screw.

According to another embodiment of the invention compatible with the above, the second horizontal peripheral seal is a structural function sealant, such as silicone, polyurethane (PU), polysulfides, modified silicone (MS-Polymer). These sealants have a very good mechanical strength in addition to their sealing properties to water and air and adhesion to glass. This second peripheral seal is still called a seal. By structural function is meant the ability to transfer the mechanical stresses related in particular to the weight of the glass sheets, the thermal expansion stresses and the opening-closing movements.

According to an advantageous implementation of the invention, the transparent spacer is formed from a rigid transparent resin at ambient temperature comprising a polymer chosen from a polymethyl methacrylate (PMMA), a polycarbonate (PC), a polystyrene ( PS), a polyvinyl chloride (PVC), a polyamide (PA), a polyetherimide (PEI), polyethylene terephthalate (PET), a styrene-acrylonitrile copolymer (SAN), their copolymers or a mixture of these compounds. Preferably, the transparent spacer is formed from PMMA or polycarbonate because of their high transparency and ease of use. The term polymer here covers both polymers and copolymers.

By the term rigid resin at room temperature is meant a resin which has, at ambient temperature, a longitudinal modulus of elasticity (Young's modulus) greater than 1.0 GPa and preferably greater than 1.5 GPa. Most preferably, the rigid resin has a Young's modulus greater than 2.0 GPa.

According to the invention, the transparent vertical peripheral seal is formed from a room temperature flexible transparent adhesive resin selected from a polyisobutylene-based adhesive, a double-sided acrylic polymer, rubber or silicone strip more commonly known in the art. the name "pressure sensitive adhesive" (PSA) or "transfer tape". The combination of rigid vertical spacers and a flexible seal provides a door capable of withstanding repeated mechanical forces such as several hundred thousand opening / closing cycles.

Alternatively to this flexible transparent resin, it is also possible to use a crosslinkable adhesive of acrylic or epoxy type. In this case, the implementation is in liquid or pasty form and the adhesive is crosslinked in situ between the glass sheet and the vertical spacer.

Crosslinkable is understood to mean forming in situ a three-dimensional network of polymer chains under the action of ultraviolet radiation, moisture or a hardener. These materials, in addition to being transparent, exhibit good performance in terms of water vapor and gas tightness and also have good adhesion to glass while resisting ultraviolet light. Preferably, the transparent vertical peripheral seal is formed from a flexible transparent adhesive resin at room temperature as described above.

The first horizontal peripheral seal consists of a polyisobutylene sealant more commonly known as butyl or a double-sided acrylic polymer, rubber or silicone tape, or a combination of both. This type of seal is particularly effective in terms of sealing with water vapor and gases.

The use of insulating multiple glazing makes it possible to optimize the energy efficiency of the refrigerated cabinet. The thermal insulation is usually determined by the overall performance of a multiple glazed glazing element, defined by Ug, the heat transfer coefficient of the glazing unit (calculated according to EN673 and ISO 10292). By heat transfer coefficient Ug is meant the amount of heat passing through the glazing, in steady state, per unit area, for a difference of one degree Celsius between the ambiances, for example external and internal. Several factors can improve this coefficient Ug, for example, layers of low emissivity type deposited on the glass sheets and, preferably, on their inner faces, that is to say the faces in contact with the gas strip. Another factor is the nature of the insulating gas. For example, the glass sheets used may be coated with one or more metal layers, for example, TopN ^® or TopN + T ^® layers (AGC trademarks). TopN + T ^® layers are preferred. According to an advantageous implementation of the invention, compatible with all the preceding implementations, the insulating glazing unit has a heat transfer coefficient Ug of at least 0.3, preferably at least 0.6 and most preferred way of at least 1.0 W / m ² . The heat transfer coefficient Ug is generally at most 1.8 W / m ² . According to another particular embodiment of the invention, it being also compatible with the preceding implementations, a primer layer is disposed at least between:

- the transparent seal and the vertical spacer, - the transparent seal and the glass sheet

Preferably, a primer layer is disposed both between the transparent seal and the vertical spacer and between the transparent seal and the glass sheet.

By the term "primer layer" is meant a layer of an organic product which adheres well to the peripheral seal and which has selective adhesive properties vis-à-vis the glass or the transparent resin which is made the spacer . Examples of such primers are based on compounds of the family of silanes and compounds of the family of acrylic resins. Good adhesion is understood to mean an adhesion which requires a positive tearing force to separate the two assembled parts and whose rupture of the two parts between them is cohesive, as described in the EN 1279 part 4 standard.

A primer having given excellent results is the VHB API 15 ^® primer from 3M.

According to yet another advantageous embodiment of the invention, which is also compatible with the preceding modes, the reinforcement may be a closed or open profile section of U or L, rectangular or curved, which is inserted, at least in part in the second peripheral seal. Preferably, the profile is sectional U or L. The profile can be made of steel, stainless steel or polymer material. Preferably, the profile is made of stainless steel for its excellent rigidity and the absence of any corrosion. It is generally the same length as the horizontal spacer. It is at least partly inserted into the second peripheral seal and comes to rest on this horizontal spacer. According to a particular embodiment of the invention, which is always compatible with the other modes, the insulating glazing unit comprises at least a first and a second glass sheet associated via the intermediate frame, said sheets being of different sizes and therefore able to be offset on part or all of the periphery of the glazing. This is called asymmetric or remote glazing. This difference in size between the first and second glass sheets has the advantage of facilitating the insertion of a reinforcement and a fastening system. The interest here is also to allow translational opening / closing systems (sliding doors). Another advantage of this particular embodiment of the invention is to allow the placement of a heating network that could be deposited on the part of the offset glass to prevent the appearance of condensation at the edge of glazing.

Advantageously, the invention also relates to a door of which at least one glass sheet is partially covered with a decorative layer chosen from ceramic inks and organic inks. Preferably, the decorative layer is an opaque ceramic ink, more commonly called enamel, which masks the spacer frame and the peripheral seals. Generally, the enamel is applied by screen printing on one of the faces of at least one sheet of glass. Preferably, the enamel layer is applied to the glass sheet which is directed towards the outside of the refrigerating cabinet.

Even more advantageously, the fastening system is masked by the decorative layer deposited on the glass sheet.

Most advantageously, an enamel layer is deposited on the offset surface of the glazing unit and makes it possible to hide the system for fixing the view of an outside observer.

In the door according to the invention, it is possible, for security reasons, that the glass sheets are sheets of toughened glass or sheets of laminated glasses. The latter comprise a stack of at least one sheet of polyvinyl butyral plastic (PVB) disposed in sandwich between two sheets of glass. Such stacks of laminated glasses are present with total thicknesses of glass (not including the thickness of the PVB sheet (s)) ranging from 4 mm up to and including 24 mm.

According to an advantageous implementation of the invention, the stiffening element has a profile shape extending over the entire length of at least one horizontal spacer. Preferably, the stiffening element is a section of square or rectangular section. More preferably, it is glued to the horizontal spacer using a double-sided acrylic adhesive tape.

In the door according to the invention, the reinforcement can also be an integral part of the horizontal spacer.

In another embodiment of the invention, still compatible with the other modes, the horizontal spacer may be a profile composed of two chambers. The first chamber borders the internal space of the glazing unit and the second chamber is in contact with the second peripheral seal and acts as reinforcement. More preferably, the second chamber may be hollow and of comparable section to the first chamber. Most preferably, the first chamber may also be hollow and contain the desiccant material.

In order to further improve the sealing of the door, a second transparent vertical peripheral seal may advantageously be added so that it is contiguous with the following elements: a. the transparent vertical peripheral seal; b. the vertical transparent spacer; vs. the two sheets of glass. The nature of this second seal is preferably chosen from the same materials as those of the transparent vertical peripheral seal already described. upper. It is important, however, that the material of each of the two seals be of a different nature.

5. List of Figures Other features and advantages of the invention will appear more clearly on reading the following description of a preferred embodiment, given as a simple illustrative and nonlimiting example, and the accompanying drawings, among which :

FIG. 1 illustrates the refrigerated cabinet (2) comprising doors (1) according to the invention.

FIG. 2 schematically illustrates the door (1) of refrigerated cabinet furniture (2) comprising an insulating multiple glazing unit (3), the associated spacer frame (6) and the fastening system (13) of the door (1) according to the invention. FIG. 3 is a sectional view along AA in the vertical edge of a multiple glazing unit of the door of FIG. 2. This sectional view represents the following elements: the glass sheets (4, 5), the internal space (7), the double vertical transparent peripheral seal (10) and the vertical transparent spacer (11).

FIG. 4 is a sectional view along BB in a horizontal edge of a multiple glazing unit of the door of FIG. 2. This sectional view represents the following elements: the glass sheets (4, 5), the internal space (7), the first horizontal peripheral seal (8), the second horizontal peripheral seal (9), the horizontal spacer (12), the reinforcement (14) and the stiffening element (15) which is here a profile of rectangular section. Figure 5 illustrates the spacer frame (6) of the glazing of the door according to one embodiment of the invention. The figure shows the elements the following: the transparent vertical spacers (11), the horizontal spacers (12), the stiffening elements (15) and the screws (17) connecting the vertical transparent spacers (11) and the rigidifiers (15).

FIG. 6 illustrates the intermediate frame (6) according to another embodiment of the glazing of the door according to the invention. The figure shows the following elements: the transparent vertical spacers (11), the horizontal spacers (12), the stiffening elements (15) and the reinforcements (14). In this embodiment, the stiffening elements (15) are connected to the vertical spacers (11) by means of a polyisobutylene-based sealant. It is also possible to add screws (not shown in the figure) to perfect the connection.

Figure 7 illustrates the same spacer frame according to yet another embodiment of the invention. The figure shows the following elements: the transparent vertical spacers (1 1), the horizontal spacers (12), the stiffening elements (15) also taking the role of reinforcements (14) and the screws (17) making the connection between the transparent vertical spacers (11) and the stiffening and reinforcing elements (15, 14).

Figure 8 illustrates a front view of a sheet (4) or (5) of glass with a decorative enamel layer (16) according to a particular embodiment of the invention.

Figure 9 is a figure similar to Figure 3 where a second transparent vertical peripheral seal (18) overcomes the first seal (10). This figure is a sectional view along AA in the vertical edge of the door of FIG. 2. It is distinguished that this seal (18) is contiguous with the first double seal (10) and also with the transparent vertical spacer (11) and to the two sheets of glass (4, 5). 6. Description of embodiments of the invention

Example 1

It has been realized a door (1), according to the invention, which can be mounted on the refrigerating cabinet (2).

The door (1) is a double glazing (3) comprising a first (4) and a second (5) glass sheet sodo-silico-calcic type of dimensions 1700 mm x 600 mm and each having a thickness of 4 mm. The glass sheets (4) and (5) were then quenched. These glass sheets (4, 5) have been associated via an intermediate frame (6) which keeps them at a distance from one another. The spacer frame (6) has been formed by two horizontal spacers (12) Super Spacer ^® from the firm Edgetech and two transparent vertical spacers (11) PMMA as shown in Figure 5. The dimensioning of the horizontal spacers (12) is the following: length 580 mm x thickness 14 mm x height 7 mm. The dimensioning of the vertical spacers (11) is as follows: length 1700 mm x thickness 12 mm x height 10 mm. The desiccant is integrated into the matrix of the Super Spacer ^® spacer.

At each glass sheet (4, 5) / horizontal spacer (12) interface, a 1 mm thick polyisobutylene bead was placed over the entire length of the horizontal spacers (12) as shown in FIG. 4. This polyisobutylene cord acts as the first double horizontal peripheral seal (8). Likewise, at each glass sheet (4, 5) / transparent vertical spacer (11) interface, a 3M VHB ^® double-sided acrylic adhesive tape seal 4918 of 2 mm thickness and 10 mm height was deposited along the entire length of the vertical spacers (11) as shown in FIG. to increase the adhesion between the acrylic adhesive and the glass sheet, a 3M ^® AP 115 silane primer was deposited at each interface.

Two polymer profiles, used as stiffening elements (15), were bonded to the top of each horizontal spacer (12) (see Figure 5) using a 3M VHB ^® double-sided acrylic adhesive tape. mm thick. The dimensioning of each profile was as follows: length 580 mm, thickness 8 mm, height 8 mm. The distance between the end of the transparent vertical spacers (11) and the upper edge of the stiffening element (15) was 10 mm. As illustrated in FIG. 5, the screws (17) make the connection between the transparent vertical spacers (11) and the stiffening elements (15).

Between the two sheets of glass (4, 5), an internal space (7) comprising a plate of an insulating gas of argon type is closed by the spacer frame (6). The concentration of Argon is 85%. As illustrated in Figure 4, a second horizontal Dow Corning ^® 3362 silicone peripheral seal (9) (hereinafter referred to as a "silicone seal") was placed along the horizontal edges and is contiguous to the horizontal spacers. (12), the first horizontal peripheral seal (8) and the two glass sheets (4, 5). The stiffening element (15) has also been immersed in the silicone seal (9).

As also illustrated in Figure 4, a U-shaped section, having the role of reinforcement (14), is inserted into the silicone seal (9). The reinforcement (14) is made of stainless steel and extends along the horizontal spacer (12). A fastening system (13) has been partially inserted in the second horizontal peripheral seal (9) and in the reinforcement (14). The fastening system (13) was composed of the following elements: two screws 5 mm in diameter, and a pivot piece contiguous to the silicone seal (9) and equipped with two holes where the two screws were inserted . The screws also came insert into the silicone seal (9) and the U-profile (14). This fastening system (13) has secured the door (1) to the refrigerating cabinet (2).

EXAMPLE 2 Effect of a Primer Materials: - Rectangular plates made of soda-silico-calcic float glass, 4 mm thick and 65 mm x 25 mm in size.

- Tape 3M VHB ^® double-sided 4918 transparent type manufactured by the firm 3M

- 3M ^® AP 115 transparent primer of silane type marketed by the firm 3M

Test tubes with primer: Two test pieces are made, each from two rectangular plates of silico-soda-lime float glass, one of which has been previously coated (on one side) with a TopN + T low-emissive layer.

One of the two faces of the non-pre-coated wafer and the pre-coated face of the second wafer are cleaned with isopropanol. The primer is then applied to the cleaned surfaces under a controlled atmosphere at a temperature of 25 ° C and 50% relative humidity (RH). The primer dries for 2 to 3 minutes before applying a 25 x 10 mm tape strip transversely to one of the glass plates so as to cover its entire width in the center position of the wafer, avoiding the formation and trapping of any air bubble between the tape and the glass plate. The second glass plate is then glued in its central position on the other side of the tape already adhered to the first glass plate so that the glass plates form an angle of 90 ° between them. A glass / layer stack low-e / primer / double-sided tape / primer / glass has been produced. Reference specimens:

Two reference specimens were made in a similar manner by omitting the primer application step. A glass / layer stack low-e / double-sided tape / glass has been made. Evaluation

A reference test tube and a test tube with primer were placed for 336 hours in a chamber under a controlled atmosphere at a temperature of 70 ° C. and 100% RH.

A reference test tube and a test tube with primer were not subjected to this conditioning.

The 4 test pieces were then subjected to a mechanical test consisting in pulling the two glass plates of each test piece. The test was carried out under a controlled atmosphere at a temperature of 25 ° C. and 50% RH. The traction was exerted in a direction perpendicular to the surface of each of the two glass sheets and the pulling force necessary to cause tearing and complete separation of the two wafers was measured.

The results obtained are shown in Table 1:

Table 1

The rupture is of cohesive type inside the material of the tape, except in the case of the sample without primer having undergone a conditioning. The latter exhibits a phenomenon of delamination of the adhesive from the conditioning phase and gives rise to an adhesive rupture at the coated glass interface of the low-e / tape layer.

The test piece made according to the particular variant of the invention has an increased resistance to aging performance compared to a reference test piece.

Claims

Door (1) of refrigerated cabinet

(2) including: a. at least one insulating multiple glazing

(3) consisting of at least a first

(4) and a second sheet of glass

(5) associated with each other via an intermediate frame (6) which keeps them at a certain distance from each other, said frame

(6) extending along the horizontal and vertical edges of the glazing, b. between said at least two sheets of glass, at least one internal space

(7), comprising a blade of an insulating gas, closed by at least a first

(8) and a second peripheral joints (9) on the horizontal edges and at least one peripheral joint (10) on the vertical edges, said peripheral joints being arranged around said internal space (7), the intermediate frame (6) comprising at at least two vertical spacers (11) and at least two horizontal spacers (12), at least one vertical spacer (11) being made of transparent resin, at least one vertical peripheral joint (10) being transparent, the horizontal spacers (12) being composed of at least one profile, characterized in that a) the spacers (11, 12) are connected together to form said intermediate frame (6),

b) at least one fixing system (13) securing the door (1) to the enclosure unit (2) is at least partially inserted in at least one horizontal peripheral joint (9),

c) the door (1) includes a reinforcement (14), integral with the system fixing and inserted at least partially in at least one horizontal peripheral joint (9),

d) the intermediate frame (6), the peripheral joints (8, 9, 10) and the reinforcement (14) replace the frame of a traditional door and fulfill its functions.

Door (1) according to the preceding claim, characterized in that the vertical spacers (11) are connected to the horizontal spacers (12) by means of at least one stiffening element (15).

Door (1) according to the preceding claim, characterized in that the stiffening element (15) is secured to at least one reinforcement (14).

Door (1) according to the preceding claim, characterized in that the reinforcement (14) coincides with the stiffening element (15).

Door (1) according to any one of claims 2 to 4, characterized in that the stiffening element (15) is in contact with at least the second horizontal peripheral joint (9).

Door (1) according to any one of the preceding claims, characterized in that the fixing system (13) extends into at least one of the following parts: a. a stiffening element (15), b. a horizontal spacer (12).

Door (1) according to any one of the preceding claims, characterized in that the second peripheral seal (9) is a sealant with a structural function chosen from silicones, polyurethanes, polysulphides and modified silicones.

Door (1) according to any one of the preceding claims, characterized in that the transparent resin comprises a polymethyl methacrylate, a polycarbonate, a polystyrene, a polyvinyl chloride, a polyamide, a polyetherimide, a polyethylene terephthalate, a styrene-acrylonitrile copolymer, their copolymers or a mixture of these compounds.

9. Door according to any one of the preceding claims, characterized in that the transparent vertical peripheral seal (10) is chosen from: a. a double-sided tape: i. made of acrylic polymer ii. rubber, iii. silicone, b. a polyisobutylene-based adhesive, c. a crosslinkable acrylic or epoxy adhesive.

10. Door (1) according to any one of the preceding claims, characterized in that the first horizontal peripheral seal (8) consists of a sealant based on polyisobutylene or a double-sided strip of acrylic polymer, rubber or silicone, or a combination of the two.

11. Door (1) according to any one of the preceding claims, characterized in that the fixing system (13) consists of at least one screw.

12. Door (1) according to any one of the preceding claims, characterized in that the glazing (3) has a heat transfer coefficient Ug ranging from 0.3 to 1.8 W/m ² .

13. Door (1) according to any one of the preceding claims, characterized in that a layer of primer is placed between at least: a. the transparent seal (10) and the vertical spacer (11), b. the transparent seal (10) and the glass sheet (4.5).

14. Door (1) according to any one of claims 2 to 13, characterized in that the stiffening element (15) is linked to the vertical spacers (11) and/or horizontal (12) by at least one of the following elements: has. a screw (17) made of steel, zinc-plated steel, stainless steel or bronze. b. an adhesive selected from polyisobutylene-based sealants, crosslinkable acrylic polymer glues, crosslinkable epoxy glues, double-sided acrylic polymer adhesive strips.

15. Door (1) according to any one of the preceding claims, characterized in that the reinforcement (14) has a profile shape and is, at least in part, inserted in the second peripheral seal (9).

16. Door (1) according to any one of the preceding claims, characterized in that one of the glass sheets is offset relative to the other glass sheet.

17. Door (1) according to any one of the preceding claims, characterized in that at least one sheet of glass (4,5) is partially covered with a decorative layer (16) chosen from ceramic inks and organic inks.

18. Door (1) according to the preceding claim, characterized in that the fixing system (13) is masked by the decorative layer (16) deposited on the sheet of glass (4,5).

19. Door (1) according to any one of the preceding claims, characterized in that the glass sheets (4,5) are tempered and/or laminated.

20. Door (1) according to any one of claims 2 to 19, characterized in that the stiffening element (15) has a profile shape extending over the entire length of at least one horizontal spacer (12).

21. Door (1) according to any one of the preceding claims, characterized in that the reinforcement (14) is an integral part of the horizontal spacer (12).

22. Door (1) according to any one of the preceding claims, characterized in that a second transparent vertical peripheral seal (18) is contiguous to the following elements: a. the transparent vertical peripheral seal (10); b. the transparent vertical spacer (11); vs. the two sheets of glass (4, 5).