Vehicle glazing unit and method for manufacturing this glazing unit

Abstract

The invention relates to a vehicle glazing unit and to a method for manufacturing a glazing unit (1), this glazing unit comprising a glazed element (2) and a seal (3) attached to at least one inner face (22) of the glazed element (2), the inner face (32) of the seal (3) having at least one machined surface portion, referred to as the bonding portion, free of contamination by a releasing agent, this bonding portion being juxtaposed with a reference surface (322), contaminated by the releasing agent, the bonding surface (323) being in surface continuity with the reference surface (322) or recessed with respect to the reference surface (322).

Description

VEHICLE GLAZING AND METHOD FOR MANUFACTURING SAID GLAZING

[0001] The invention relates to vehicle glazing, and in particular roof glazing, comprising a glazed element and a seal, as well as a method for manufacturing such glazing.

[0002] The glazed element has an exterior face intended to be oriented towards an exterior space, and an interior face intended to be oriented towards an interior space.

[0003] The seal has at least one inner face intended to be oriented towards said interior space. This seal is fixed on the inner face of the glazed element, generally at the edges thereof.

[0004] At least a portion of the inner face of the joint forms a bonding surface intended to be assembled, by bonding, to a structural element of the vehicle. Technical background

[0005] The prior art discloses, in particular patent applications No. WO2006035180A1 and No. WO2006092472A1, vehicle glazing, comprising a glazed element and a seal fixed to at least one edge of the glazed element.

[0006] As is known, the gasket is manufactured using an encapsulation process, consisting of molding a polymer material into a mold placed on the glazed element, generally along one edge of the glazed element. Conventionally, the mold is coated, before molding, with a release agent forming a barrier preventing adhesion between the mold and the molded polymer material, which ensures quick and easy demolding of the gasket without damaging the mold.

[0007] The seal attached to the glazed element can have several functions. Among these functions, it can ensure the attachment of the glazing to the vehicle structure, by bonding a portion of the inner face of the seal to surfaces of the vehicle structure which are intended for this bonding. The surfaces of the seal which are intended to be bonded to the vehicle structure must, however, undergo special preparation before being bonded.

[0008] Indeed, the presence of the release agent on the surface of the joint constitutes an obstacle preventing the proper adhesion of the means for bonding the glazing to the vehicle. It is therefore appropriate that this release agent be removed, before bonding, from the surfaces of the joint which are intended to be bonded to the structure of the vehicle.

[0009] It has been established, by microscopic observation, that the release agent can penetrate inside the polymer material constituting the joint, up to a depth of the order of 100 μm below its surface. To ensure that the joints can be bonded on a surface completely free of release agent residues, the surface of this joint which is to be bonded is generally machined, in order to remove all the portion of this joint likely to be contaminated by the release agent. The machining must be carried out to a sufficient depth, well above the maximum penetration depth of the release agent, to guarantee perfect adhesion of the bond.

[0010] This machining operation must be strictly controlled to ensure that it has removed a sufficient quantity of the polymer forming the seal. The machining itself must therefore be preceded and followed by precise measuring steps to verify the depth of the machining actually carried out. These measuring steps considerably extend the manufacturing time of the glazing, and require the implementation of expensive measuring equipment.

[0011] The present invention intends to propose a solution which facilitates the implementation of the machining step of the surface of the seal which is intended to be bonded to the vehicle, while ensuring that this machining step removes a sufficient quantity of material from the surface of the seal, to present a surface completely free from contamination by the release agent. Solution to the technical problem

[0012] The present invention is based on the placement, near the surface to be machined of the joint, which must be machined to form the bonding surface, of reference surfaces defining a reference plane. This reference plane is placed at a position chosen to ensure that machining of the surface to be machined up to the reference plane corresponds to machining to an expected depth. Thus, the measurement of the machining depth is greatly facilitated: if the surface to be machined protrudes from the reference surfaces, this means that the machining has not been sufficient. If, on the contrary, the surface to be machined is in the same plane as the reference surfaces, or if the reference surfaces protrude from the surface to be machined, this means that the machining of the surface to be machined is sufficiently deep.

[0013] The present invention thus relates to vehicle glazing, and in particular roof glazing according to claim 1. This glazing comprises:- a glazed element having an outer face intended to be oriented towards an outer space, and an inner face intended to be oriented towards an inner space, and- a seal made of plastic material, fixed to at least said inner face of said glazed element, said seal having at least one inner face intended to be oriented towards said inner space, at least a part of said inner face being contaminated by a release agent, said inner face of said seal having at least one portion of machined surface, called the bonding portion, free from contamination by said release agent.

[0014] According to the invention, said bonding surface is juxtaposed with at least one surface portion, called the reference surface, substantially parallel to said bonding surface, said reference surface being contaminated by said release agent, said bonding surface being in surface continuity with said reference surface or set back from said reference surface.

[0015] By the fact that said bonding surface is juxtaposed with at least one portion of the reference surface, it should be understood that the reference surface is located, laterally, at a distance from the bonding surface intended to come into contact with the glue which is itself intended to bond the glazing to the bodywork opening. This distance may be between 0.5 and 5.0 mm, advantageously between 1.0 and 3.0 mm. This distance makes it possible to prevent the machining from machining the portion of the reference surface.

[0016] The glazing according to the invention therefore has a bonding surface that has been machined to eliminate any contamination by the release agent. This glazing is particularly advantageous in that the presence of the reference surface, next to the bonding surface, makes it very easy to check that the machining of the bonding surface has been carried out to a sufficient depth. Indeed, the reference surface is, before machining, set back from the reference surface by a distance greater than the depth of the machining that must be carried out to obtain the bonding surface. The bonding surface must therefore have been machined to a depth such that it is in surface continuity with the reference surface, or set back from the reference surface. This condition is very easy to check, by a simple visual inspection. Verification that the glazing according to the invention is compliant is therefore facilitated.

[0017] According to an advantageous embodiment, said reference surface is machined, and said reference surface and said bonding surface are in surface continuity (they are aligned when seen in section).

[0018] According to this embodiment, the glazing may have a uniform surface consisting of the bonding surface and the reference surface. This uniformly machined surface is a sign that the machining of the bonding surface has been machined to a sufficient depth, and therefore that this surface is not contaminated by the release agent. It should be noted that the reference surface has only been machined to a small thickness, insufficient to guarantee that this surface is free from contamination by the release agent. This reference surface must therefore, despite its machining, be considered contaminated by the release agent and unsuitable for bonding.

[0019] According to another advantageous embodiment, said reference surface is not machined, and said bonding surface is in surface continuity with (aligned with) said reference surface or set back from said reference surface.

[0020] According to this embodiment, the reference surface remains as obtained during molding, and can provide a reference, after machining the bonding surface, in order to measure the depth of the machining that has been carried out. This unmachined reference surface is contaminated by the mold release agent and unsuitable for bonding.

[0021] Preferably, in this case, said bonding surface is set back from said reference surface by a distance of less than 100 μm. For the purposes of the present invention, the concept of “setback” is understood to mean the depth of the joint, in the direction of the glazed element; it is not a lateral setback.

[0022] In fact, the withdrawal of the bonding surface from the reference surface being the sign that the machining has been carried out to a sufficient depth, it is useless for the machining of the bonding surface to be carried out to a greater depth.

[0023] The present invention further relates to a method for manufacturing vehicle glazing, and in particular glazing according to the invention, the glazing comprising:- a glazed element having an outer face intended to be oriented towards an outer space, and an inner face intended to be oriented towards an inner space,- a seal made of plastic material, fixed to at least said inner face of said glazed element, said seal having at least one inner face intended to be oriented towards said inner space, at least a portion of said inner face being contaminated by a mold release agent,said method comprising a step of machining a surface portion of said inner face of said seal, called the surface to be machined, to form a machined surface, called the bonding surface, free from contamination by said mold release agent.

[0024] According to the invention, said machining is carried out to a depth such that said bonding surface is in surface continuity with a surface portion of said inner face of said joint, called the reference surface, juxtaposed with said bonding surface, or that said bonding surface is set back relative to said reference surface, said reference surface being, before said machining step, set back relative to said surface to be machined, (or the outer surface of the joint is in excess thickness relative to said reference surface); this withdrawal (or this excess thickness) is preferably a distance greater than the maximum depth of contamination of said inner face of said joint by said release agent.

[0025] This process is particularly advantageous in that it makes it very easy to determine whether the machining of the bonding surface has been carried out to a sufficient depth. This can be checked visually or by a very simple measurement, which makes the manufacturing of the glazing easier.

[0026] According to an advantageous embodiment, said machining is carried out only on said surface to be machined, to a depth such that said bonding surface is in surface continuity with said reference surface, or that said bonding surface is set back relative to said reference surface.

[0027] Verification that the machining of the bonding surface has been carried out to a sufficient depth can thus be easily done by measuring the offset between the reference surface and the bonding surface, which are adjacent.

[0028] According to another advantageous embodiment, said machining is carried out on said surface to be machined and on said reference surface, to a depth such that said bonding surface is in surface continuity with the machined reference surface.

[0029] Verification that the machining of the bonding surface has been carried out to a sufficient depth can thus be easily carried out by observing the surface condition of the reference surface. A surface condition of this reference surface indicating that it has been machined is a sign that the machining of the neighboring bonding surface has been carried out to a sufficient depth.

[0030] Preferably, said machining step is followed by a measuring step making it possible to verify that said bonding surface is in surface continuity with said reference surface, or that said bonding surface is set back from said reference surface.

[0031] This measurement step can be done very easily, either by visual verification or by simple measurements. Verification that the machining of the bonding surface has been carried out to a sufficient depth can in fact be done by verifying qualitative characteristics of positive or negative offsets between the surfaces, without having to measure the amplitude of these offsets.

[0032] Advantageously, said machining step is followed by a step of bonding said bonding surface.

[0033] The machining according to the invention makes it possible to easily guarantee that the bonding surface has been machined to a sufficient depth to no longer have any residue of release agent, and therefore that it can be bonded under satisfactory conditions.

[0034] The concept of surface continuity is called "flush" in English; it does not require that surfaces which are in continuity with each other be in contact with each other but, seen in section, their respective edges are aligned.

[0035] is a partial and schematic perspective view of a vehicle window, showing a portion of the seal before the machining stage of this seal.

[0036] is a partial section, along AA, of the edge of the glazing before machining the seal.

[0037] is a partial cut of the edge of the glazing, after machining of the seal produced according to a first embodiment of the invention.

[0038] is a partial section of the edge of the glazing, after machining of the seal produced according to a second embodiment of the invention.

[0039] is a partial section of the edge of the glazing, after machining of the seal produced according to a third embodiment of the invention.

[0040] is a partial section of another vehicle window, showing a seal before machining of that seal.

[0041] is a partial section of the glazing, after machining the joint carried out to an insufficient depth.

[0042] is a partial section of the glazing of the, after machining of the joint produced according to an embodiment of the invention.

[0043] is a partial section of the glazing of the, after machining of the seal produced according to another embodiment of the invention.

[0044] is a partial section of the glazing of the, after machining of the seal produced according to another embodiment of the invention.

[0045] Detailed description of alternative implementations of the invention and embodiments of the invention Glazing components 1

[0046] La shows an example of a portion of a glazing unit 1 comprising a glazed element 2 whose edge is surrounded, at least partially, by a seal 3. La is a partial section of the edge of this glazing unit 1, before any machining of the seal 3. Figures 3 to 5 are partial sections corresponding to the section of the, after machining operations carried out, respectively, according to three variants of the invention.

[0047] The glazing 1 is a vehicle glazing and is intended to close an opening provided in a vehicle body, and in particular an opening in a vehicle roof, by creating a separation between an exterior space E which is outside the vehicle and an interior space I, which is inside the vehicle. The vehicle may in particular be a motor vehicle. The glazed element 2 thus has an exterior face 20 intended to be turned towards the exterior space E, an interior face 22 which is intended to be turned towards the interior space I, as well as a peripheral edge 21, located between these two faces.

[0048] The glazed element 2 may be monolithic, i.e. made up of a single sheet of material, or be composite, i.e. made up of several sheets of material between which at least one layer of adhesive material is inserted in the case of laminated glazing, or between which there is at least one interlayer in the case of multiple glazing (double glazing, triple glazing, etc.). The sheet(s) of material may be mineral, in particular glass, or organic, in particular plastic.

[0049] The seal 3 has an outer face 30 intended to be oriented towards the outer space E and an inner face 32 intended to be oriented towards the inner space I. The seal 3 is fixed to an edge of the glazed element 2. This seal 3 is advantageously made of plastic material and more particularly, in the embodiment shown, of polyurethane. Manufacturing the seal

[0050] The seal 3 is advantageously manufactured by implementing a manufacturing method called “encapsulation”, well known to those skilled in the art. This method comprises a step of molding the seal 3 in a molding device comprising a mold cooperating, during the molding step, with the glazed element 2 to form a molding cavity having in section the shape of the profile of the seal 3.

[0051] The mold used is advantageously composed of several parts which, in the closed state of the mold, are assembled together and with the glazed element 2 to form the closed space constituting the molding cavity. The plastic material constituting the seal is injected into the molding cavity via at least one orifice provided in the mold. Release agent

[0052] To facilitate the removal of the mold parts after the demolding step, and to avoid any damage to the seal or the mold parts, the internal faces of the mold are generally covered with a release agent. These release agents are lubricating products, well known to those skilled in the art, which may in particular include wax, silicone, oil, etc. Their non-stick properties prevent the seal from adhering to the internal faces of the mold.

[0053] At the end of the molding operation, after removal of the mold, residues of mold release agent remain on the surfaces of the joint that have been in contact with the mold. It has further been observed that these residues of mold release agent do not remain only on the surface of the joint, but on the contrary penetrate into the material of this joint, which they contaminate to a depth p of up to 100 μm, in the cases that have been observed by the inventors.

[0054] The sections of figures 2 to 5 represent with different hatching the zones 301 of the seal 3 in which its material is not contaminated by residues of mold release agent and the zones 302 of this seal 3 in which the material of the seal 3 is contaminated by residues of mold release agent.

[0055] Since the release agent has anti-adhesive properties, it is likely to prevent proper bonding to a surface that it contaminates. To obtain, on a surface portion of the seal 3, a bonding surface capable of allowing the seal 3 to bond securely to a structure of a vehicle, such as, for example, a metal structure of a bodywork, it is necessary to carry out adequate preparation of the surface portion of the seal 3 to remove all residues of release agent. Machining the seal

[0056] Since the release agent deeply contaminates the material of the seal 3, simply cleaning its surface is not sufficient to remove it. To obtain a bonding surface free of release agent residues, it is therefore necessary to machine a portion of the surface of the seal 3, making it possible to remove the material of the seal 3 over a thickness greater than the thickness likely to be contaminated by release agent residues.

[0057] In the embodiment shown, in which contamination of the seal 3 by the release agent can be observed to a depth p of up to 100 μm, a surface portion of the seal 3 is generally machined to a depth p' of at least 300 μm, to ensure the absence of any release agent on the surface obtained, which can thus constitute a bonding surface.

[0058] In the embodiments shown in Figures 1 to 5, the seal 3 has, on its inner face 32, a strip projecting relative to the rest of the inner face 32, which constitutes the surface to be machined 321. This surface to be machined 321 is intended, after its machining allowing the removal of materials likely to be contaminated by the release agent, to form the bonding surface allowing the bonding of the glazing 1 to the structure of the vehicle. In the embodiment shown, this surface to be machined 321 extends over the entire length of the seal 3, on its inner face 32, in a plane substantially parallel to the inner face 22 of the glazed element 2. Reference surface.

[0059] To facilitate the correct machining of the surface to be machined 321, and to easily guarantee that this machining is carried out to the chosen depth, it is provided according to the invention that surface portions of the joint, hereinafter called reference surfaces 322, adjoin the surface to be machined 321.

[0060] In the embodiments shown in Figures 1 to 5, a plurality of reference surfaces 322 are provided, at regular intervals, along an edge of the surface to be machined 321. Three of these reference surfaces 322 are visible in the.

[0061] It is also possible, in other embodiments, for reference surfaces to be placed along multiple edges of the surface to be machined. It is also possible for reference surfaces to extend along the entirety of one of the edges of the surface to be machined, or even completely surround the surface to be machined.

[0062] Advantageously, the reference surfaces 322 define a plane, called the reference plane, substantially parallel to the plane of the surface to be machined 321, placed back from the surface of this plane of the surface to be machined. The reference plane can thus be the plane passing through a reference surface. When several reference surfaces together define the reference plane, this reference plane can be the plane tangent to the different reference surfaces. In other embodiments, the reference surfaces can define a non-planar surface. When, for example, the glass element carrying the seal has a curved shape, the surface to be machined and the reference surfaces can have shapes reproducing the curve of the glass element.

[0063] In the present application, a first surface of a seal attached to a glass element is considered to be "recessed" relative to a second surface if it is closer to the glass element carrying the seal than the second surface. Conversely, the second surface is then considered to be "protruding" relative to the first surface.

[0064] Preferably, the reference surfaces 322 define a plane offset, relative to the surface to be machined 321, by a distance such that the machining of the surface to be machined 321, until the alignment of this surface to be machined 321 on the reference surfaces 322, is sufficient to remove from this surface to be machined 321 all of the material which may be contaminated by the mold release agent.

[0065] Thus, machining the surface to be machined 321 sufficient for this surface to be machined 321 to be aligned with the reference surfaces 322 (that this surface to be machined 321 is in surface continuity with the reference surfaces 322, preferably with each reference surface 322), or that the surface to be machined 321 is set back from the reference surface 322, guarantees that the machining is sufficient to remove from the surface to be machined 321 all of the material likely to be contaminated by the mold release agent. The presence of the reference surface 322 next to the surface to be machined 321 therefore makes it possible to have a very easy criterion to verify to ensure that the machining of the surface to be machined 321 has been carried out with sufficient depth, in the direction of the glass element.

[0066] Verification that the surface to be machined 321 is aligned with the reference surfaces 322, or that it is set back from the reference surfaces 322, can be done much more easily and efficiently than the successive depth measurements that were previously necessary to verify the machining. Thus, verification that the surface to be machined 321 is aligned with the reference surfaces 322, or that it is set back from the reference surfaces 322 can be done easily by visual inspection by an operator. It can also be done easily by inspection by artificial vision, or by analysis of images collected by a camera. Analysis of images collected by a camera is facilitated by the fact that machining modifies the surface condition (the visual appearance) of the surface to be machined.

[0067] Finally, it is also possible to verify this criterion by a double distance reading, simultaneously measuring the distance between a sensor and the surface to be machined 321 and between this sensor and a reference surface 322. Such a measurement is easier to carry out than a double distance measurement between the sensor and the surface to be machined 321, before and after machining. Examples of figures.

[0068] In the embodiment shown in Figures 1 to 5, a plurality of reference surfaces 322, adjoining the surface to be machined 321, are provided on the inner face 32 of the seal. These reference surfaces 322 are placed in a plane substantially parallel to the plane of the surface to be machined 321, before its machining, slightly set back from this surface to be machined 321. The reference surfaces 322 are however projecting relative to the rest of the inner face 32 of the seal 3.

[0069] The joint 3 is represented after machining carried out according to a first embodiment of the invention. According to this embodiment, the surface to be machined 321 (shown in dotted lines) has been machined to form a machined surface 323, substantially parallel to the surface to be machined 321 and flush with the reference surface 322. By "flush", it is understood that these two surfaces are in the same plane. The position of the reference surface 322 has been chosen such that this flushness guarantees that the surface to be machined 321 has been machined sufficiently to remove all the material that may have been contaminated by the release agent. This machined surface 323 can therefore constitute a bonding surface.

[0070] The joint 3 is represented after machining carried out according to a second embodiment of the invention. According to this embodiment, the surface to be machined 321 (shown in dotted lines) has been machined to form a machined surface 323, substantially parallel to the surface to be machined 321 and set back from the reference surface 322. The position of the reference surface 322 has been chosen such that this setback of the machined surface 323 ensures that the surface to be machined 321 has been machined sufficiently to remove all the material that may have been contaminated by the release agent. This machined surface 323 can therefore constitute a bonding surface.

[0071] The joint 3 is represented after machining carried out according to a third embodiment of the invention. According to this embodiment, machining has been carried out simultaneously on the surface to be machined 321 (appearing in dotted lines) and the reference surface 322 (appearing in dotted lines), until a machined surface 323 is formed, resulting from the machining of the surface to be machined 321 and substantially parallel to the surface to be machined 321, and a machined reference surface 324, resulting from the machining of the reference surface 322 and substantially parallel to the surface 322. The machining carried out allows the machined surface 323 and the machined reference surface 324 to be effectively machined and flush with each other. The position of the reference surface 322 has been chosen such that this outcrop ensures that the surface to be machined 321 has been machined sufficiently to remove all material that may have been contaminated by the release agent.This machined surface 323 can therefore constitute a bonding surface. The machined reference surface 324, which results from the machining of the reference surface 322, has been machined to a smaller thickness than the machined surface 323. This machined reference surface 324 is therefore likely to be contaminated by mold release agent residues. Other shape of the seal

[0072] Figures 6 to 10 show another example of a portion of glazing comprising a glazed element 2 whose inner face 22 carries a seal 4. This represents this seal 4 before any machining. Figures 7 to 9 represent this seal 4 after machining operations carried out, respectively, according to different parameters.

[0073] The glazed element 2 may be similar to that represented by figures 1 to 5. It thus has an outer face 20 intended to be oriented towards the outer space E and an inner face 22 intended to be oriented towards the inner space I.

[0074] The inner face 22 of the glazed element 2 carries a seal 4 which has an inner face 42 intended to be oriented towards the interior space I. This seal 4 is not fixed to the edge of the glazed element 2; the seal 4 is not in contact with an edge of the glazed element 2. The seal 4 can be located near this edge, or at any position on the inner face 42 of the glazed element 2. This seal 4 is advantageously produced by encapsulation, in plastic material and, preferably, in polyurethane.

[0075] Due to the manufacturing method of the seal 4, its inner face 42 is contaminated by mold release agent residues. Thus, the sections of Figures 6 to 10 represent with different hatching the zones 401 of this seal 4 in which the material is not contaminated by mold release agent residues and the zones 402 of this seal 4 in which the material is contaminated by mold release agent residues.

[0076] In the embodiments shown in Figures 6 to 10, the seal 4 has, on its inner face 42, a strip constituting the surface to be machined 421. To ensure correct machining of the surface to be machined 421, a reference surface 422 is provided adjoining the surface 421, and set back from the surface to be machined 421, in a plane substantially parallel to the plane of the surface to be machined 421. This reference surface 422 is, in these embodiments, set back relative to the other parts of the inner face 42 of the seal 4.

[0077] The joint 4 is represented after machining of the surface to be machined 421 (shown in dotted lines) carried out to an insufficient depth p''. This machining forms a machined surface 423 remaining protruding relative to the reference surface 422. A visual inspection makes it easy to identify that this machined surface 423 is not aligned with the reference surface 422, nor set back relative to this reference surface 422, and therefore that it is insufficiently machined. There is therefore a risk that this machined surface 423 is contaminated by the release agent. This machined surface 423 cannot therefore constitute a bonding surface.

[0078] The joint 4 is represented after machining carried out according to another embodiment of the invention, to form a machined surface 423 flush with the reference surface 422, or aligned with this reference surface 422. The position of the reference surface 422 has been chosen such that this flushness guarantees that the surface to be machined 421 (appearing in dotted lines) has been machined sufficiently to remove all the material which may have been contaminated by the release agent. This machined surface 423 can therefore constitute a bonding surface.

[0079] The joint 4 is shown after machining carried out according to another embodiment of the invention, to form a surface 423 set back from the reference surface 422. The position of the reference surface 422 has been chosen such that this set back of the machined surface 423 ensures that the surface to be machined 421 (shown in dotted lines) has been machined sufficiently to remove all the material that may have been contaminated by the release agent. This machined surface 423 can therefore constitute a bonding surface.

[0080] The joint 4 is represented after machining carried out according to another embodiment of the invention. According to this embodiment, machining has been carried out simultaneously on the surface to be machined 421 and the reference surface 422, until a machined surface 423 is formed, resulting from the machining of the surface to be machined 421 and substantially parallel to the surface to be machined 421, and a machined reference surface 424, resulting from the machining of the reference surface 422 and substantially parallel to the reference surface 422. The machining carried out allows the machined surface 423 and the machined reference surface 424 to be effectively machined and flush with each other. The position of the reference surface 422 has been chosen such that this flushness ensures that the surface to be machined 421 has been machined sufficiently to remove all material that may have been contaminated by the release agent. This machined surface 423 can therefore constitute a bonding surface.The machined reference surface 424, which results from the machining of the reference surface 422, has been machined to a smaller thickness than the machined surface 423. This machined reference surface 424 is therefore likely to be contaminated by mold release agent residues.

[0081] In each of the embodiments of Figures 8 to 10, the inner face 42 of the seal 4 has a portion of machined surface 423, forming a bonding surface, free from contamination by the release agent. This machined surface 423 is juxtaposed with at least one reference surface 422, or with a machined reference surface 424, which remains contaminated by the release agent. The bonding surface 423 is aligned with the reference surface 422 or 424, or set back from the reference surface 422. Other variants

[0082] The skilled person will be able to imagine several variations to the solutions described above. It is thus possible for reference surfaces to be placed in the middle of the surface to be machined. They can, for example, be formed by blind holes opening out in the middle of the machined surface. In this case, the machining must be carried out on the surface to be machined until the holes no longer appear on the surface. In such a case, the portions of reference surfaces, formed by the bottoms of the holes and located in the middle of the machined surface, will not be free from contamination by the release agent, and will therefore be unsuitable for bonding.

Claims

Vehicle glazing (1), and in particular roof glazing, comprising:- a glazed element (2) having an outer face (20) intended to be oriented towards an outer space (E), and an inner face (22) intended to be oriented towards an inner space (I),- a seal (3, 4) made of plastic material, fixed to at least said inner face (22) of said glazed element (2), said seal (3, 4) having at least one inner face (32, 42) intended to be oriented towards said inner space (I), at least a portion of said inner face (32, 42) being contaminated by a release agent,said inner face (32, 42) of said seal (3, 4) having at least one machined surface portion (323, 423), called a bonding portion, free from contamination by said release agent,characterized in that said bonding surface (323, 423) is juxtaposed with at least a surface portion, called the reference surface (322, 324, 422, 424), substantially parallel to said bonding surface (323,423), said reference surface (322, 324, 422, 424) being contaminated by said release agent, said bonding surface (323, 423) being continuous with said reference surface (322, 324, 422, 424) or set back from said reference surface (322, 422)., Vehicle glazing according to the preceding claim, characterized in that said reference surface is machined (324, 424), and in that said reference surface (324, 424) and said bonding surface (323, 423) are in surface continuity. Vehicle glazing according to claim 1, characterized in that said reference surface (322, 422) is not machined, and said bonding surface (323, 423) is in surface continuity with said reference surface (322, 422) or set back from said reference surface (322, 422). Vehicle glazing according to the preceding claim, characterized in that said bonding surface (323, 423) is set back in depth relative to said reference surface (322, 422) by a distance of less than 100 μm. A method of manufacturing a vehicle glazing (1), in particular a glazing (1) according to any one of claims 1 to 4, said glazing (1) comprising:- a glazed element (2) having an outer face (20) intended to be oriented towards an outer space (E), and an inner face (22) intended to be oriented towards an inner space (I),- a seal (3, 4) made of plastic material, fixed to at least said inner face (22) of said glazed element (2), said seal (3, 4) having at least one inner face (32, 42) intended to be oriented towards said inner space (I), at least a portion of said inner face (32, 42) being contaminated by a mold release agent,said method comprising a step of machining a surface portion of said inner face (32, 42) of said seal (3, 4), called the surface to be machined (321, 421), to form a machined surface (323, 423), called the bonding surface, free from contamination by said release agent,characterized in that said machining is carried out to a depth such that said bonding surface (323, 423) is in surface continuity with a surface portion of said inner face (32, 42) of said joint (3, 4), called reference surface (322, 324, 422, 424), juxtaposed with said bonding surface (323, 423), or that said bonding surface (323, 423) is set back relative to said reference surface (322, 422), said reference surface (322, 324, 422, 424) being, before said machining step, set back relative to said surface to be machined (321, 421)., Manufacturing method according to the preceding claim, characterized in that said machining is carried out only on said surface to be machined (321, 421), to a depth such that said bonding surface (323, 423) is in surface continuity with said reference surface (322, 422), or that said bonding surface (323, 423) is set back relative to said reference surface (322, 422). Manufacturing method according to claim 5, characterized in that said machining is carried out on said surface to be machined (321, 421) and on said reference surface (322, 422), to a depth such that said bonding surface (323, 423) is in surface continuity with the machined reference surface (324, 424). Manufacturing method according to any one of claims 5 to 7, characterized in that said machining step is followed by a measuring step making it possible to verify that said bonding surface is in surface continuity with said reference surface (322, 422), or that said bonding surface (323, 423) is set back in depth relative to said reference surface (322, 422). Manufacturing method according to any one of claims 5 to 8, characterized in that said machining step is followed by a step of bonding said bonding surface.

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