FR2832666A1 - METHOD FOR MANUFACTURING A READY-TO-GLUE ELEMENT AND MOUNTING METHOD - Google Patents

Abstract

According to the invention, an element is produced, such as a roof or door module (1) or a profile (16), in particular for protecting a motor vehicle, ready to be glued to a frame (5) or other surface ( 29) by means of a bonding bead (4, 24) produced according to a bonding pattern, in particular closed, by manufacturing at least one part (7, 16) of the element (1, 16) by molding in the presence of a bonding bead (4, 24) of shape reproducing the bonding pattern and of determined section. For mounting the element, the protection (9, 25) is removed or the bonding bead (4, 24) and the element (1, 16) is applied to the frame (5) or other surface (29).

Description

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PROCESS FOR MANUFACTURING AN ELEMENT READY TO BE GLUE AND
MOUNTING PROCEDURE.

 The present invention relates to a method of manufacturing an element, such as in particular a roof or door module of a motor vehicle, or a body protection strip (in particular of a door) or a monogram, ready to be stuck on a support, in particular a bodywork element, such as a frame or other surface.

 The current trend, in particular in the field of motor vehicles, is towards the design of elements, in particular for doors or vehicle roofs, which integrate additional functions, in particular a variety of equipment such as a covering, into a structural part. or accessories. This is to facilitate the mounting of the vehicle by reducing the number of assembly operations on an assembly line, the equipment and / or accessories having been pre-assembled in a workshop or a separate unit.

 WO 98/39170 thus discloses a roof module for a motor vehicle which consists of a sheet metal and an interior covering, capable of integrating pre-assembled elements such as sun visors, sunroof panels and its mechanism, handle, ventilation grille, interior lighting, safety elements, airbag, etc. The module can be fixed to the vehicle body exclusively by gluing or in addition to screwing, the module being provided with housings intended to receive beads of glue.

 It is known from US-A-4,471,519 to glue a roof to a car body by depositing a bead of glue on the body frame, then pressing the roof in contact with the glue, and making the bead harden of glue for a sufficient time for the assembly to reach the desired rigidity. However, this is still an operation which is carried out on the assembly line and

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 which intervenes in the cumulative assembly time of the vehicle.

 In order to allow the shortest possible assembly time for these elements, it appears desirable to pre-equip them with fixing means which can be used on the line in a limited time.

 The object of the present invention is to propose a new method of preparing elements already provided with a fixing means, able to be stored for a certain period, so that they can be mounted directly on a frame or any other receiving surface with a number limited operations.

 According to the invention, the term “element” is understood to mean a part which can incorporate one or more additional functions in addition to its own function (s), including the fixing function by means of a complete integrated fixing means, the sealing function, the energy absorption function, the electromagnetic screen, insulation or thermal conductivity function.

 This object, as well as others which will appear subsequently, has been achieved with a method of manufacturing an element, such as a roof or door module or a profile, in particular for protection or identification (monogram). of a motor vehicle, ready to be glued to a support such as a frame or other surface by means of a bonding bead produced according to a bonding pattern, in particular closed, characterized in that at least part of the element by molding in the presence of a bonding bead of shape reproducing the bonding pattern and of determined section.

 Compared to a process where the molded element is first produced and the bonding bead is then applied to the latter, the method according to the invention which incorporates the application of the bonding bead to the manufacture of the element itself, not only makes it possible to dispense with steps of cleaning or degreasing the surface of the molded element with a view to the adhesion of the adhesive on the latter, but also to obtain a perfect interface between the element and the bonding bead, whatever the geometry of the element, in particular if it has, at least locally, an accentuated relief. The dimensional characteristics of the bonding bead can also be obtained in a reproducible manner, when it is made up in a mold.

 According to a first embodiment, a prefabricated adhesive bead is first placed in a mold and the element is then molded in contact with the adhesive bead. The previously formed adhesive bead can be

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 treated, before placing in the mold or once placed in the mold, on the surface intended to be in contact with the molded material so as to increase the adhesion capacity between the molded material and the bead material d 'adhesive. The adhesive bead can also be chosen with a geometric configuration such that a mechanical anchoring is created between the molded material of the element and the bonding bead.

 In another embodiment, the adhesive bead itself is formed in a first mold element, and the element (or at least a portion of the latter) is molded in a second mold element cooperating with the first so that the molded material of the element comes into contact with the freshly prepared adhesive bead.

 According to a first variant, the bonding bead is first formed in the first mold element, the mold being closed if necessary by means of a complementary mold element, then the first mold element is placed opposite the second. mold element, if necessary after removing said complementary mold element, the mold thus obtained is closed and the molded material is injected into this mold. The adhesive bead can be obtained in the first mold element, optionally containing a protective film, by injection molding or by extrusion of a viscous material in the cavity, or by any other method of depositing material in the cavity. the mold element. The moldable material of the molded element can be deposited in the closed mold by injection of liquid.

 According to a second variant, the adhesive bead is preferably formed simultaneously in the first mold element and the molding material of the element is deposited in the second mold element, then the two mold elements are placed opposite so as to close the mold, and the molding is allowed to end thus.

 The adhesive bead and the element can be obtained in their respective mold elements, by injection molding or by extrusion of a viscous material in the cavity, or by any other method of depositing material in the cavity of the element. of mold. In particular for the production of the adhesive bead, it may be preferable to bring the molding material into a cavity of a mold element by extrusion (or other suitable method of distribution) of a viscous or pasty material, using means distributors

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 mobile, the mold being fixed, or else fixed dispensing means, the mold then being mobile, since a counter-mold or complementary mold element is then not absolutely necessary in the first molding step of the process.

 In some cases, the extruded material may have sufficient rheological properties to retain its shape, if necessary after a very short wait, during the movement of the mold element while the mold is closing.

 When the first and second mold elements are compared, at least one of the two is moved from the first molding position to the closed position.

 Commonly, each of the first and second mold elements is initially in a horizontal position with its molding cavity directed upwards: the mold can then be closed preferably by inverting one of the mold elements, the other remaining fixed or movable in vertical translation so that the final mold is also in a horizontal position. However, a tilting of the two elements at an identical or different angle so that they meet in a vertical or inclined position is not excluded.

 As a variant, one of the mold elements may be in a horizontal position with its molding cavity facing downwards, advantageously placed just above the other mold element so that the closure is effected by simple vertical translation of the one or the other or both.

 In another variant, one of the mold elements may be in a vertical or inclined position and the closure is effected by tilting this element and possibly the other.

 Preferably, the materials used, in particular the molded material of the element, are chosen to have good mutual adhesion.

 Among the materials which can be used to make the element are all the materials commonly used in injection molding techniques.

By way of example, mention may be made of plasticized polyvinyl chloride, polyolefins, in particular polypropylene, thermoplastic elastomers, as well as polyurethanes, of one-component or two-component type used in the technique of reactive injection molding or RIM. (for Reaction Injection Molding). The polyurethanes can optionally be modified by a

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 elastomer such as polyolefins or rubber, in particular butyl, EPDM (ethylene-propylene-diene), nitrile, styrene-butadiene ...

 In general, thermoplastic elastomers (TPE) consist of mixtures of polymers or of block copolymers exhibiting a thermoplastic phase and an elastomer phase optionally chemically bonded together in the case of copolymer. An example is the SANTOPRENE brand product from AES which consists of a mixture of polypropylene (PP) and crosslinked EPDM in the form of nodules embedded in the continuous phase of PP, with a variable weight ratio of PP compared to EPDM. Also known are products based on block copolymer chains with elastomeric blocks, in particular isoprene or butadiene, hydrogenated or not, linked to thermoplastic blocks, in particular of polystyrene, for example the products of the KRATON brand from Shell.

 Also known are thermoplastic urethanes (TPU) available in the form of a non-reactive polymer, obtained from several sources of polyol, at least one of which forms a sequence with thermoplastic properties and at least one other which forms a sequence with elastic properties. Examples are the products PEARLTHANE or PEARLCOAT from Merquinsa, or ELASTOLLAN from Elastogran. It is also possible to form a polyurethane-based element with a wide variety of commercially available reactive compositions, of the mono-or bi-component type. By way of example, mention may in particular be made of single-component compositions based on a polyurethane prepolymer with a polyester, polyether, polycaprolactone, polyolefin or polysiloxane backbone. An isocyanate-terminated prepolymer cures in moisture with a certain propensity for foaming; a siloxane-terminated prepolymer cures in moisture without foaming. An example of a commercial product is BETASEAL from Gurit Essex. These polyurethane compositions can be modified with an elastomer, in particular nitrile rubber, SBR, or butyl, or thermoplastic elastomer or a polymer having a certain non-crosslinkable flexibility such as polyolefins or plasticized PVC. Examples of such compositions which can be used for manufacturing foamed or cellular materials, in particular by adding a foaming gas, are described in EP-A-0 326 704 or EP-A-0 930 323.

 In a particular embodiment, the element is made from a

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 expandable or foamed moldable material, either by a chemical foaming process of a plastic material by means of a chemical agent (either an additive or a reactive function of the plastic material itself) releasing a gas which expands the material plastic, or by a physical foaming process of a plastic material by means of a gas mixed with the plastic material to expand the latter. This embodiment is advantageous in the variants where the material to be molded is deposited in a mold element before the mold is closed: in fact, it ensures complete filling of the mold, without causing excess material at the joint plane of the mold.

 The material of the element can also contain organic or mineral fillers, such as talc, silica, calcium carbonate, alumina, powdered metals, etc.

 The adhesive bead is chosen to remain inert during the storage period.

 In particular embodiments, the adhesive bead consists of a heat-activated, photoactivatable, chemo-activatable, reactive to moisture and / or permanently tacky adhesive. The same adhesive can have several of these cumulative properties.

 Advantageously, the adhesive bead is protected by a peelable film.

 Thermal activation generally requires exposure of the adhesive to temperatures above room temperature in any season in temperate climates. Alternatively, one can also use adhesives (especially epoxy based) which must be stored under very low temperature in order to remain inert. It is generally not necessary to provide special protection to neutralize the adhesive during the storage period.

 Likewise, an adhesive which can be activated by a specific chemical reagent is generally not sensitive to the ambient atmosphere. An adhesive which can be activated by visible light can advantageously be protected from light by an opaque film. A moisture-reactive adhesive must be protected by a moisture barrier film to be stored for a long time. A permanent adhesive should be protected from contact during storage.

 In all cases, a protective film, even if it is not compulsory, is desirable to avoid soiling the surface of the adhesive with

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 dust which could interfere with the final adhesive bond.

 As a film, use may be made of a plastic film, in particular of polyethylene, polyester, polyvinyl chloride or vinylidene, coated or not with a layer of silicone, in particular fluorosilicone, in order to protect in particular an adhesive layer based on silicone. The film can also be reinforced with a layer of metal, especially aluminum.

 Examples of adhesives with thermal activation include resins of the epoxy, polyurethane, polyether or polyester type, in particular polyacrylic, oxyalkylene, vinyl as well as thermoplastics of the polyolefin type, in particular polyethylene or polypropylene, polyamide. The adhesive layer can advantageously consist of a hot melt adhesive among which are known butyl rubbers, in particular styrene-butadiene, ethylene vinyl acetate copolymers (EVA), polyamides, polyaminoamides, or derived copolymers, and compositions with polyurethane base. The adhesive may contain curing additives or heat activated crosslinking catalysts.

 Reactive or moisture-curing adhesives can be chosen from polyurethane prepolymers with isocyanate endings, blocked or not, or silane, silicones.

 Chemoactivatable adhesives can in particular be reactive curing agents by oxidation, or alternatively compositions containing an adhesive and an encapsulated or heat-activatable curing catalyst.

 As regards the use of the adhesive to form said bead of adhesive, an adhesive of the hot-melt type is advantageously used which can be used in the molten state. However, it is also possible to use a liquid adhesive or in a liquid vehicle, in particular in organic solution or in aqueous suspension / dispersion which forms an adhesive layer by evaporation of the vehicle solvent or diluent.

 The adhesive is advantageously chosen to be compatible with the material of the element. When the adhesive bead is already relatively hardened or at least has a skin on its surface, it is possible to treat the face of the adhesive bead which will be exposed to the molded material with an adhesion or primary promoter, or even d '' interpose another adhesive between the bead of adhesive and the material of the element.

 The bonding of the adhesive bead with the material of the element can

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 advantageously be reinforced by the fact that the surface of the adhesive bead exposed to the molded material of the element is textured. The relief of the texturing has the effect of increasing the contact surface between these two materials and therefore of reinforcing the adhesion.

 The method according to the invention advantageously makes it possible to conform the bonding bead to reproduce the desired pattern, advantageously when this pattern is a closed curve which in particular follows at least part of the periphery of the element. The method also makes it possible to also conform the section of the adhesive bead so that it adapts perfectly in the space reserved for it in the final assembly.

 As a variant, the bonding bead can allow other functions to be carried out simultaneously with its original function (bonding between two elements); thus, it can provide a sealing function, or an energy absorption function, an electromagnetic screen function, thermal insulation or, on the contrary, thermal conductivity ...

 In particular, in the case where the adhesive bead is protected by a peelable film, the moldable adhesive material is advantageously chosen from those whose mechanical properties in the non-crosslinked state are sufficient to allow peeling of the film without tearing of the material. cord.

 Such materials include in particular moisture crosslinkable systems capable of being protected by an anti-humidity barrier film, in particular systems of the one-component polyurethane type, preferably thermoplastic, optionally modified with an elastomer. An advantageous system is a polyurethane skeleton prepolymer of polyester, polyether or polyolefin type, obtained for example from a polyol and a polyisocyanate, at least one of which comprises a polymer or oligomer skeleton as mentioned above.

 Preferably, a peelable protective film is previously applied to the surface of the mold cavity as an agent which facilitates demolding. This peelable film can advantageously constitute the protection of the adhesive layer. In particular, the film may have moisture barrier properties to protect a layer of moisture reactive adhesive.

 The method according to the invention allows the mass production of elements ready to be mounted by gluing, this manufacture can be

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 automated. The final assembly of these elements is very rapid and responds to the need to reduce the assembly time of assemblies such as motor vehicles.

 The invention also relates to a method for mounting an element, such as a roof or door module of a motor vehicle or a protective strip or a monogram, ready to be glued to a frame or other surface by means an adhesive bead deposited in a bonding pattern made as described above, characterized in that the protection is removed or the bonding bead is activated and the element is applied to the frame or other surface.

 Other details and advantageous characteristics will emerge below on reading the description of illustrative but nonlimiting examples of the invention, made with reference to the accompanying drawings in which: - Figure 1 shows a perspective view of the 'assembly of a roof module on a car body; - Figure 2 shows a sectional view of the edge area of the roof module equipped with a bonding bead; - Figure 3 illustrates the manufacture of the module and the adhesive bead in a mold; - Figure 4 illustrates a manufacturing variant of an element according to the invention.

 First of all, it should be pointed out that for the sake of clarity the relative proportions between the different elements represented are not respected.

 FIG. 1 shows a perspective view of the upper part of a motor vehicle equipped with a roof module 1 attached to a bay 2 of the bodywork 3.

 The roof module 1 is shown in the unassembled position to make visible its face which is directed towards the interior of the vehicle. To simplify the reading of the figure, no accessory or equipment is shown on the roof module, but it goes without saying that all the usual equipment such as sun visor, etc. can be integrated into this module.

 The roof module 1 is mounted on the bodywork 3 by means of a bonding bead 4 which is brought into contact with a flange 5 of the bodywork bay. In this case the bonding pattern is in the form of a closed frame running along the periphery of the roof module. The adhesive bead 4 ensures the

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 fixing of the module 1 on the bodywork 3 and can also exercise a function such as sealing between the interior space and the exterior space delimited by these two parts.

 In Figure 2, the module is shown as it is before mounting on the vehicle.

 In the embodiment shown, the module 1 has a so-called sandwich structure with an outer sheet 6, an intermediate mass 7 and an inner covering 8. The adhesive bead 4 is disposed on the periphery of the module 1 on or next to the dressing 8.

 The adhesive bead 4 is linked on a first face to the module 1 and is protected on another face by a film 9, the protected face being adhesive after removal of the film.

 To this end, the bead 4 can be made of a moisture-crosslinkable adhesive, the film 9 having a moisture barrier function, for example made of low density polyethylene. The adhesive material which can be used can be chosen from systems based on polyurethane, advantageously thermoplastic, optionally modified with a polymer, in particular an elastomer, to give the adhesive the desired mechanical properties. Among these materials, very particularly preferred are polyurethane prepolymers with a polymer or oligomer backbone, in particular polyether and polyester. A thermoplastic and moisture-crosslinkable polyurethane composition suitable for this use can be obtained by the hot reaction of 2 parts of a polyesterdiol sold under the brand DYNACOLLE 7231 by Degussa-Huls with 1 part of isocyanate prepolymer based on polyether marketed under the brand LUPRANATO MP130 by the company BASF.

 The manufacture of the module is illustrated in FIG. 3: in a cavity 10 of a mold 11, the film 9 is arranged, the face of which in contact with the mold (which will be the external face of the film after extraction of the module from the mold ) advantageously made of polyethylene can serve as an agent for releasing the molded material. On the internal face of the film 9 the material of the bead 4 is deposited, for example by means of an extrusion nozzle 12. In another cavity 13 of the mold 11, the covering 8 is simultaneously placed or has been placed beforehand. .

 The adhesive material can be brought in the form of a fluid or viscous material, in particular a hot melt adhesive in the molten state or a liquid adhesive or

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 in organic solution or aqueous dispersion, the solvent or diluent of which is evaporated. A preferred adhesive material is a permanent tack adhesive or a moisture-curing polyurethane. The adhesive material which can be used can be chosen from systems based on polyurethane, advantageously thermoplastic, optionally modified with a polymer, in particular an elastomer, to give the adhesive the desired mechanical properties. Among these materials, very particularly preferred are polyurethane prepolymers with a polymer or oligomer backbone, in particular polyether and / or polyester. A thermoplastic and moisture-crosslinkable polyurethane composition suitable for this use can be obtained by the hot reaction of 2 parts of a polyesterdiol sold under the brand DYNACOLLO 7231 by Degussa-Huls with 1 part of isocyanate prepolymer based on polyether marketed under the brand LUPRANATO MP130 by the company BASF.

 The purpose of the film 9 is generally to avoid, during the period of storage at the module manufacturer or at the automobile manufacturer, that dust comes to contaminate the bonding bead and to avoid any contact with a surface other than the surface. final assembly which would cause damage to the glue 4. It also has the function of protecting the glue against external conditions, in particular humidity, light, oxygen, liable to cause untimely activation of the adhesive 4. With the adhesives crosslinkable to moisture, the film 9 has a moisture barrier function, for example made of low density polyethylene.

 By making the bonding bead in this way in a mold, it is possible to form a bead in the form of a frame without discontinuity, therefore causing no leakage. The nozzle 12 may have a section calibrated to give a preliminary shape to the material of the bead 4, which ends up being shaped in the cavity 10 of the mold 11. In particular, it may be desirable to texturize the upper surface of the bead of glue 4 for good adhesion with the mass 7.

 Preferably, the intermediate mass 7 is immediately molded, so as to take advantage of the tackiness that the bead of adhesive 4 has on its free surface. If the bead has already more or less hardened, or if the material of the intermediate mass 7 does not have a very good compatibility with the adhesive 4, the adhesion of the upper surface of the adhesive bead 4 can be promoted.

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 with the material of the intermediate mass 7, by depositing a layer of an adhesion promoter or of another adhesive.

 Then deposited on the cord 4 and on the covering 8 in the cavity 14 the integral mass of intermediate material 7 such as polyurethane.

 The sheet metal 6 is then docked and the whole is pressed with an upper mold 15. In this way the module and its adhesive bead are formed almost simultaneously.

 Alternatively, the intermediate mass 7 can be formed by injecting material into the cavity formed by the two half-molds 11 and 15 where the film 9, the layer of adhesive 4 and the covering 8 of have been previously arranged. on the one hand and sheet metal 6 on the other.

 After a more or less long exposure time depending on the materials used, the roof module 1 can be removed from the surface of the mold with the adhesive bead 4 linked to its surface. The film 9 is also extracted from the mold cavity and remains attached to the glue 4 which it immediately protects from dust and / or moisture.

 The module 1 thus equipped with the adhesive bead 4 can be stored while awaiting its use for mounting on a vehicle, after a possible hardening treatment at the heart of the molded materials.

 The assembly is carried out simply by removing the protective film 9, after which the cord 4 is placed in contact with the flange 5. With a heat-activated adhesive, the adhesive layer can first be heated, in particular by infrared source or else place the module 1 against the flange 5 then heat carrying the adhesive bead to the temperature necessary to activate the adhesive, for example by heating the flange 5 from the inside.

 Figure 4 illustrates an alternative embodiment where the adhesive bead and the element are formed in parallel in two mold parts then joined together to complete the molding. It is a schematic diagram illustrating the different stages of the process. For more detailed considerations on the shape of the molds, reference may be made to the preceding figures. As an indication, the simple forms presented in this diagram can be illustrative of the manufacture of a strip 16 for protecting the automobile body or an identification monogram for a motor vehicle or any other object.

 On (in A), has a first mold element 17 having a mold cavity 18 according to the shape of the rod 16 in the material receiving position,

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 here horizontally with the molding cavity 18 facing upwards.

 Then (in B), a release agent is sprayed onto the mold cavity 18, or a protective film 19 which is held in the mold by thermoforming or by suction. A painting operation can be carried out in the mold (at C) to deposit a layer of paint on the agent layer or on the film 19 which will be transferred to the material of the strip 16.

 Then (in D), the material 20 is deposited on the strip 16, for example polyurethane, for example by means of an extrusion nozzle 21 delivering a mixture of polyisocyanate and polyol.

 In parallel, simultaneously or in a staggered manner, a second mold element 22 is provided (at A ') having a molding cavity 23 according to the shape of the bead of glue 24 fitted to the strip 16, in the material receiving position, here at the horizontal with the molding cavity 23 facing upwards. This open mold 22 is designed to be able to be used as an upper half-mold capable of cooperating with the lower half-mold 17 containing the polyurethane.

 Next (at B '), a protective film 25 which is held in the mold by thermoforming or by suction.

 Then (at D '), an adhesive composition 26 is deposited on the film 25, for example a hot melt adhesive in pasty or liquid form, for example by means of an extrusion nozzle 27.

 As soon as the removal operations are carried out, the mold element 22 is turned over and assembled with the mold element 17 in a closed mold 28 in which the polyurethane 20 hardens at least partially (not necessarily until complete crosslinking).

 To ensure complete filling of the mold 28, necessary for the proper anchoring of the adhesive 24 with the hardened strip 16, an excess volume of molded material 20 can be used: the excess will become a burr at the joint plane between the two elements mold 17 and 22, which are removed by deburring. With polyurethane, an alternative is to slightly expand the molded material, for example by adding water to the polyol component of the mixture, which results in a structural foam which perfectly fits the mold cavity without burr formation.

 After demolding, we obtain (at F) a strip 16 already provided with a

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 adhesive bead 24 protected by the film 25, which can act as a barrier against humidity in the case of an adhesive, especially a crosslinkable moisture adhesive, or against dust in the case of a pressure-sensitive adhesive ( or self-adhesive).

 If this has not already been done before, the method may include a step (in G) of painting, if necessary after having freed the surface of the rod from the release agent which adheres to its surface.

 The finished baguette can be stored or delivered to the end user.

 For the assembly, we will proceed (in H) to the removal of the protective film 25, possibly we will activate (in 1) the adhesive and we will apply (in J) the strip 16 on the support 29 for which it is intended, for example an automobile body element.

 The invention has been described in the particular case of the manufacture of a roof module or of a strip ready for bonding, in particular on a frame, but applies to the production of any other element intended to be assembled by gluing with a bodywork element or the like. It is thus envisaged the production of all types of decorative pieces, protective or other, possibly endowed with additional functionalities, ready for bonding on a complementary piece with an assembly surface not necessarily in the form of a frame.

 Although the detailed description particularly emphasizes the embodiments where the adhesive bead is formed by molding, the embodiments where a ready-to-use adhesive bead is placed in a mold element can be deduced by simple modifications of the descriptive elements indicated.

Claims (19)

1. Method for manufacturing an element, such as a roof or door module (1) or a profile (16), in particular for protecting a motor vehicle, ready to be glued to a frame (5) or other surface ( 29) by means of a bonding bead (4.24) produced according to a particularly closed bonding pattern, characterized in that at least one part (7.16) of the element (1.16) is manufactured by molding in the presence of a bonding bead (4.24) of shape reproducing the bonding pattern and of determined section.  2. Method according to claim 1, characterized in that a prefabricated adhesive bead is first placed in a mold and the part of the element is then molded in contact with the adhesive bead.  3. Method according to claim 2, characterized in that the previously formed adhesive bead is treated, before placing in the mold or once placed in the mold, on the surface intended to be in contact with the molded material. so as to increase the adhesion capacity between the molded material and the material of the adhesive bead.  4. Method according to one of claims 2 or 3, characterized in that the adhesive bead is chosen with a geometric configuration such that a mechanical anchoring is created between the molded material of the element and the bonding bead 5. Method according to claim 1, characterized in that the adhesive bead is formed (4.24) itself in a first mold element (11,22), and the element (16) is molded or at least a part (7) of the element in a second mold element (14,15; 17) cooperating with the first (11,22) so that the molded material of the element comes into contact with the adhesive bead freshly prepared.  6. Method according to claim 5, characterized in that the bonding bead (4) is first formed in the first mold element (11), the mold being closed if necessary by means of a complementary mold, then the first mold element (11) is placed opposite the second mold element (15), if necessary after removing said mold element <Desc / Clms Page number 16>  complementary, the mold (11.15) thus obtained is closed and the material (7) is injected into this mold.  7. Method according to claim 6, characterized in that the bonding bead (4.24) can be obtained in the first mold element (11), optionally containing a protective film (9), by injection molding or by extrusion (12) of a viscous material (4) into the cavity, or by any other method of depositing material in the cavity of the mold element.  8. Method according to any one of the preceding claims, characterized in that the bonding bead provides additional functions such as in particular a sealing function, or an energy absorption function, an electromagnetic screen function, thermal insulation or, conversely, thermal conductivity.  9. Method according to claim 6 or 7, characterized in that the moldable material of the molded element part can be deposited in the closed mold by injection of liquid.  10. Method according to claim 6, characterized in that one forms, preferably simultaneously, the adhesive bead (24) in the first mold element (22) and the molding material (20) is deposited the element (16) in the second mold element (17), then the two mold elements (22,17) are placed opposite so as to close the mold.  11. Method according to claim 9, characterized in that the adhesive bead (24) is molded from a viscous or pasty material (26) brought in particular by extrusion (27) in the first mold element (22).  12. Method according to any one of claims 5 to 11, characterized in that when the first (22) and second (17) mold elements are compared, at least one (22) of the two is moved from the first molding position (at D ') to the closed position (at E).  13. Method according to any one of the preceding claims, characterized in that the element (1,16) consists at least in part (7) of polyvinyl chloride, plasticized or not, of polyolefin, in particular polypropylene, of a thermoplastic or polyurethane elastomer.  14. Method according to any one of the preceding claims, characterized in that the element (1,16) is made at least in part (7) from an expandable or foamed moldable material, by a foaming process <Desc / Clms Page number 17>  chemical or physical.  15. Method according to any one of the preceding claims, characterized in that the adhesive bead (4,24) consists of an adhesive

 thermoactivable, photoactivable, chemoactivable.  16. Method according to any one of the preceding claims, characterized in that the bonding bead (4,24) consists of an adhesive with a sticky power (tack) permanent or reactive to humidity protected by a peelable film ( 9.25).  17. Method according to any one of the preceding claims, characterized in that the adhesive bead (4,24) consists of a hot melt adhesive or from a liquid adhesive or in a liquid vehicle.  18. Method according to any one of the preceding claims, characterized in that one of the surfaces of the adhesive bead is textured.  19. Method for mounting an element, such as a roof or door module (1) or a profile (16), in particular for protecting a motor vehicle, ready to be glued to a frame (5) or other surface ( 29) by means of a bonding bead (4.24) deposited according to a bonding pattern made according to any one of claims 1 to 18, characterized in that the protection is removed (9.25) or the 'the adhesive bead (4.24) is activated and the element (1.16) is applied to the frame (5) or other surface (29).