FR3051392A1 - ADHESIVE MARKING DEVICE - Google Patents

Abstract

The invention relates to an aircraft adhesive marking device (1) comprising: - an adhesive layer (5) and - a marking layer (2) placed on the adhesive layer (5) and comprising a marking (3). ) and a support film (8), the marking device (1) having a wet vapor transmission rate (MVTR) greater than or equal to 50g / (m2.j).

Description

TECHNICAL FIELD OF THE INVENTION The invention relates to an adhesive marking device for an aircraft. The invention also relates to a method of manufacturing an adhesive marking device for an aircraft. 2. Technological background

Many markings must be affixed both outside and inside aircraft for identification, control, security or decorative purposes. In the context of the invention, the term "marking", one or more signs such as letter, number, symbol, drawing, image ... These markings can be of any shape and any size.

In aeronautics, the use of adhesive marking devices is a preferred solution.

These adhesive marking devices must withstand extreme conditions. Indeed, they are subjected to both high and low temperatures, thermal shock, humidity and significant pressure variations. They are also highly exposed to ultraviolet light.

These adhesive marking devices must have a small thickness and be applied to their substrate so as to make no protrusion. Indeed, the marking must be as thin as possible to better withstand erosion.

In addition, these adhesive marking devices must be affixed quickly and reliably. OBJECTIVES OF THE INVENTION The invention aims to overcome at least some of the disadvantages of known aircraft marking devices.

In particular, the invention aims to provide, in at least one embodiment, an aircraft marking device that can be placed on a substrate that has just been painted. The invention aims to provide, in at least one embodiment of the invention, a marking device resistant to the extreme conditions to which the aircraft are subjected. The invention also aims to provide, in at least one embodiment, an aircraft marking device that can be installed easily and quickly. The invention also aims to provide, in at least one embodiment, a marking device for aircraft that is not very sensitive to erosion. the invention aims to provide, in at least one embodiment of the invention, a marking device that can be easily removed by an operator while having a resistance to the extreme conditions to which the aircraft are subjected. The invention also aims to provide, in at least one embodiment, an aircraft marking device that can be removed from the substrate on which it is affixed without material, product or specific techniques. The invention also aims to provide, in at least one embodiment, an aircraft marking device that can be quickly removed from the substrate on which it is affixed. 4. Presentation of the invention

To do this, the invention relates to an adhesive marking device for aircraft comprising: an adhesive layer and a marking layer placed on the adhesive layer and comprising a marking and a support film, the marking device having a rate wet vapor transmission (MVTR) greater than or equal to 50g / (m ^ .j).

Moisture Vapor Transmission Rate MVTR is also measured according to ASTM F1249.

In the following description, the terms top, bottom, top, bottom and the like are used to define a sequence relationship between the different layers or films constituting the marking device according to the invention and or their respective faces, with reference to an axis normal to the surface of the substrate on which the marking device is to be affixed and oriented from the substrate towards the outside of the marking device.

In the aeronautical field, adhesive marking devices are generally affixed to a substrate which has just been painted. However, if the adhesive marking device is affixed too quickly on such a substrate, gases from the paint are emitted under the marking device. These gases trapped under the marking device form bubbles and the marking device is gondola. In addition to the unsightly nature of these bubbles, they create irregularities on the surface of the marking device making it more susceptible to erosion. The marking device according to the invention is particularly suitable for being affixed to a substrate that has just been painted. With a MVTR greater than or equal to 50 g / (m · d), the marking device is sufficiently permeable to allow the gases from the desolvation of the paint to escape during the polymerization and to prevent bubbling. By avoiding bubbling, it is particularly avoided that the marking is damaged by the swelling of the marking device.

Preferably, the marking device having a wet vapor transmission rate (MVTR) greater than or equal to 60g / (mw), more preferably at 70g / (mw), still more preferably at 80g / ( m ^ .j).

According to a preferred embodiment, the marking device has a MVTR between 50 and 1500 g / (m ^ .j). In this range of MVTR, the marking device is sufficiently permeable to allow escape of the gases from the paint while maintaining an increased resistance to the extreme conditions to which the aircraft are subjected. In order to have a marking device with optimum resistance especially when it is intended to be affixed to the outside of an aircraft, it is preferable that the latter has a MVTR which is less than 700 g / (m ^. ), more preferably less than 500

Preferably, the adhesive marking device is intended to be affixed outside an aircraft, for example on the fuselage. The marking device according to the invention is particularly adapted to the extreme conditions to which the fuselage of an aircraft is subjected. In addition, the marking device does not curl, it is insensitive to erosion.

According to a preferred embodiment, the marking device is capable of being pickled by a pickling agent. It may be necessary to remove a marking device for example to change it or when the aircraft is to be repainted. The marking devices must therefore both withstand the extreme conditions to which they are subjected and be easy to remove as soon as the operator wishes. These devices are usually removed mechanically by the operators which prove to be long and tedious. The marking devices according to the invention are capable of being stripped. Thus, they can easily be removed by a stripping agent. The removal of the marking device is particularly necessary during the stripping of the aircraft on which it is affixed. The stripping of an aircraft is done every 5 or 10 years for aesthetic reasons, but also to meet the normal wear and tear of the paint. According to this embodiment, the removal of the marking device can be done simultaneously with the stripping of the paint of the aircraft, for example with conventional or intermediate layer strippers, without this requiring an additional step.

Typically, the etchant is a chemical etchant. The stripping agent can be any type of stripper qualified in the aeronautical field. In a preferred embodiment, the etchant comprises benzyl alcohol, methylene chloride, phenol, benzaldehyde and / or mixtures thereof. Preferably, the etchant comprises benzyl alcohol and / or methylene chloride.

The marking device according to the invention comprises a marking layer. The marking layer comprises a marking and a support film.

The support film may allow to opacify the adhesive marking device. Π also makes it possible to improve the mechanical and / or thermal resistance of the marking device. It also facilitates the apposition of the marking device on the substrate. Typically, the support film comprises an upper side and a lower side.

According to a preferred embodiment, the marking is placed on the upper side of the support film.

According to a preferred embodiment, the support film has a MVTR greater than or equal to 50 g / (m · 24h) and preferably between 50 and 1500g / (m · 24h). When the marking device comprises a support film, the latter generally proves to be the most occlusive element. By taking a support film whose MVTR is greater than or equal to 50 g / (m ^ .24h), the permeability of the entire marking device will be sufficient to limit bubbling.

The support film may be porous, woven, perforated or a permeable material. Thus, because of its structure, the gases resulting from the polymerization of the paint can easily pass through it. Preferably, the support film is made of a permeable or porous material. This type of structure provides a high MVTR while maintaining good mechanical strength.

The support film may be of a material selected from the group consisting of polyester, polyurethane, polyether, polyethylene, silicone polymer, polytetrafluoroethylene, polypropylene, polyvinyl chloride, polyolefin, polyalkene, polysulfone, polyvinylacetate, polyvinyl alcohol) and polyamide.

Preferably, the support film is selected from the group consisting of urethane, polyester, polyvinyl chloride and silicone. More preferably, the support film is urethane.

According to a preferred mode of réahsation, the support film has a thickness between 20pm and 70pm, preferably between 20pm and 50pm. The thin thickness of the support film allows a better permeability.

According to a preferred embodiment, the support film is capable of being pickled by a pickling agent. The presence of a support film makes the removal of the marking device on the substrate even more difficult. The inventors have found that, surprisingly, it is sufficient that only the support film is capable of being pickled so that the entire marking device is capable of being pickled. According to a preferred embodiment, the support film comprises a resin selected from the group consisting of polyepoxide, polyurethane, alkyd and mixtures thereof. The support films based on these resins are capable of being etched by stripping agents which are skilled in the aeronautical field, for example conventional or intermediate-layer strippers. The etchant may for example be selected from the group consisting of benzyl alcohol, methylene chloride, phenol, benzaldehyde, methylene chloride, alkylphenol ethoxylate, hydrogen peroxide and mixtures thereof. .

Preferably, the support film comprises a resin selected from the group consisting of polyepoxide, polyurethane and alkide. These resins are the most commonly used binders for aircraft paints. A marking device whose support film comprises these resins is suitable for being pickled by the same pickling agents as those of the paints comprising these same resins as binder. Thus, when an operator stripping the paint of the aircraft, the marking device will be etched with the paint because its support film contains the same resins and is therefore sensitive to the same stripping agents.

The marking can be achieved by UV-curing inks, solvent inks, aqueous inks, UV curing paints, solvent paints, aqueous paints. Preferably, the marking is carried out in an ink or paint of a nature identical to that intended for painting the substrate on which the marking device is to be applied.

According to a preferred embodiment, the marking is a digitally printed marking, preferably in a drop on demand (DOD) mode. Thus, the marking is less occlusive and the gases resulting from the polymerization of the paint can pass through the latter.

The marking device preferably comprises a layer of varnish covering the marking layer. The varnish layer protects the marking layer and in particular the marking. It also allows smoothing of the marking layer and good adhesion of aerosol varnishes.

According to a preferred embodiment, the varnish layer is composed of screen-printed, painted or printed varnish. The varnish can be painted by spraying. Preferably, the varnish is printed, preferably by digital printing, preferably by DOD printing. The varnish is more preferably deposited by DOD printing because this technique allows a better permeability.

The varnish may be UV curing varnish or solvent varnish.

Preferably, the varnish layer is capable of being pickled by a pickling agent. The fact that the varnish layer is also removable can accelerate the stripping of the marking device when it comprises a layer of varnish.

The marking device also comprises an adhesive layer. The marking layer is placed on the adhesive layer.

Preferably, the underside of the support film is laid on the adhesive layer. More preferably, the marking is placed on the support film, the support film being itself placed on the adhesive layer.

The adhesive layer may be a layer of pressure-sensitive or reactivatable adhesive. Preferably, the adhesive layer is pressure sensitive.

According to a preferred embodiment, the adhesive layer has a thickness between 25pm and 50pm.

The adhesive layer can be protected by a protective sheet.

The marking device may further comprise a handling sheet. The handling sheet is placed on the upper side of the marking device so as to facilitate the application of the latter. The handling sheet is weakly adhesive. The invention also relates to a method of manufacturing a marking device according to the invention, characterized in that it comprises the steps of: -providing a support film, -appliquer a marking on at least one side of the support film of to form a marking layer and -apposer a layer of adhesive against the marking layer.

According to a preferred embodiment, the method further comprises a step of: depositing a varnish on the marking layer so as to form a layer of varnish.

According to a preferred embodiment, the marking is affixed to one side of the support film, preferably on the upper side of the support film.

Preferably, the method comprises the step of providing a carrier film having a MVTR of between 50 and 1500 g / (m ^ .24h).

According to a preferred embodiment of the method, the marking is applied by printing, preferably by digital printing, more preferably by DOD. Thus, the marking is less occlusive and the MVTR of the marking device may be higher.

The coating is deposited by screen printing and / or printing. Preferably, the coating is deposited by printing, preferably by digital printing, more preferably by DOD.

According to a preferred embodiment, the adhesive layer is applied to the underside of the support film. The invention also relates to a method of manufacturing an adhesive marking device for aircraft, characterized in that it comprises the steps of: -providing a support film having a MVTR between 50 and 1500g / (m ^ .24h) applying a marking on at least one side of the support film so as to form a marking layer and affixing an adhesive layer against the marking layer.

According to one embodiment, the method comprises a step of: depositing a varnish on the marking layer.

Preferably, the marking is applied to one side of the support film, preferably the upper side. The upper side of the support film is opposite the lower side of the support film.

According to a preferred embodiment, the varnish is also deposited on the portions of the upper side of the support film on which no marking is printed.

Preferably, the marking is applied by printing, preferably by digital printing, more preferably by DOD printing.

According to a preferred embodiment, the adhesive layer is applied to the underside of the support film.

Preferably, the coating is deposited by screen printing and / or printing, preferably by digital printing, more preferably by DOD printing. The invention also relates to an aircraft comprising a marking device according to the invention. The invention also relates to the use of a marking device according to the invention for the marking of an aircraft. 5. List of Figures Other objects, features and advantages of the invention will appear on reading the following description given solely by way of non-limiting example and which refers to the appended figures in which: FIG. 1 is a diagrammatic view in FIG. section of a marking device according to one embodiment of the invention. 6. Detailed description of an embodiment of the invention

In the figure, the scales and the proportions are not strictly respected and this, for purposes of illustration and clarity, in particular the thicknesses are exaggeratedly enlarged.

The marking device 1 shown in FIG. 1 comprises a handling sheet 7, a lacquer layer 4, a marking layer 2, an adhesive layer 5 and a protective sheet 6.

The marking layer comprises a marking 3 placed on a support film 8. The marking 3 consists of ink having a thickness of between 5 and 50 μm. The support film 8 is placed on the adhesive layer 5. The adhesive layer 5 has a thickness between 25pm and 50pm. The adhesive layer 5 is covered with a protective sheet 6. The protective sheet 6 is provided to be easily removable before the marking device 1 is used. The protective sheet 6 is for example made of silicone paper.

A layer of varnish 4 covers the marking 3. The varnish layer 4 also covers the surface of the support film 8 not covered by the marking 3.

A handling sheet 7 is placed on the varnish layer 4. The handling sheet 7 is for example paper or semi-transparent polyethylene. It is glued to the layer of varnish 4 with an adhesive whose adhesive power is greater than the adhesive power of the adhesive layer 5 on its protective sheet 6 but much less than the adhesive power of this same layer of adhesive 5 on the substrate. 7. Examples Determination of the transmission coefficient of water vapor

Material and methods

The transmission coefficient of the steam of the marking device is determined according to ASTM F 1249 at the temperature of 38 ° C and 100% RH.

Measurements are made on MOCON PERMETRAN W 3-33.

Five marking devices were tested. The first marking device comprises a translucent support film) of a permeable material. The second marking device comprises a translucent microporous support film. The third marking device comprises a conventional support film. The fourth marking device comprises a white support film of permeable material. The fifth device comprises a fdm white microporous support.

For each test device tested, a sample is placed in a test cell between two chambers at a temperature of 38 ° C +/- 1 ° C. The adhesive side of the marking device is placed on the wet chamber side (100% RH) and the other face in contact with the dry chamber swept with dry nitrogen gas at a flow rate of 100 ml / min. The water vapor transmitted through the marking device is analyzed by an Infra-Red detector (analysis of 3 marking devices by reference).

The measurements are made after 30 minutes of in situ stabilization of the marking device. The calibration of the signal is done using a NIST Water Vapor Transmission Reference certified film. The correct operation of the measuring system is monitored during each series of measurements by the response of a standard film placed in a special chamber provided for this purpose. Results

The results are expressed in g / (m * day).

They depend on the thickness. They are therefore also expressed in g * mm / (m ^ * j)

Table: MVTR in g / (m ^ * day)

Table 2: MVTR in g * mm / (m ^ * j)

Bubbling test

Material and methods

Various basecoat or top coat coatings were applied to a surface used in aeronautics (Aluminum 2024 CLAD, Aviox CF Primer 37124). After a given drying time, marking devices were affixed to this surface.

A clear coat has been applied on the whole. After a given drying time at ambient temperature (Tamb) or at 60 ° C., the state of the marking device was checked visually, in particular to check for the presence of bubbles or cracks. Results

The results are shown in Table 5 below.

No bubbling was observed for MVTR marking devices greater than 50 g / (m ^ d) following paint application which is just dry enough for dry-to-stencil application.

In the table below, the term "dry to dust" applies to a paint that has just been applied and appears dry to the touch.

Table 3-Bubbling Test

Claims (10)

An aircraft adhesive marking device (1) comprising: an adhesive layer (5) and a marking layer (2) placed on the adhesive layer (5) and having a marking (3) and a support film (8) characterized in that the marking device (1) has a wet vapor transmission rate (MVTR) greater than or equal to 50g / (m ^ .j). 2. marking device (1) according to claim 1, characterized in that the marking device (1) has a MVTR between 50 and I500g / (m2.j). 3. marking device (1) according to claim 1 or 2, characterized in that the marking device (1) is ipte to be pickled by a stripping agent and in that the support film comprises a resin selected from the group consisting of polyepoxide, polyurethane, alkyd and mixtures thereof. 4. Marking device (1) according to any one of claims 3 there, characterized in that the sipport film is porous, woven, perforated or a permeable material. 5. marking device (1) according to any one of claims 1 to 4, characterized in that it comprises a layer of varnish (4) covering the marking layer (2). 6. marking device (1) according to claim 5, characterized in that the varnish layer (4) is composed of vmiis screen printed, painted or printed. 7. A marking device (1) sdon any one of claims l to 6, characterized in that the sewing adhesive (5) is a layer of adhesive (5) pressure sensitive or reactivatable. 8. marking device (1) according to any one of claims 1 to 7, characterized in that the support film is a material selected from the group consisting of polyester, polyurethane, polyether, polyethylene, silicone polymer, polytetrafluoroethylene, polypropylene polyvinyl chloride, polyolefin, polyalkylene, polysulfone, polyvinyl acetate, polyvinyl alcohol and polyamide. 9. A method of manufacturing a marking device (I) as defined in any one of claims 1 to 8, characterized in that it comprises the steps of: -providing a support film (8), -appliquer marking on at least one side of the support film (8) to form a marking layer (2), - affixing a layer of adhesive (5) against the marking layer (2). 10. A method of manufacturing an adhesive marking device (1) for aircraft characterized in that it comprises the steps of: -providing a support film (8) having a MVTR between 50 and 1500g / (m ^ .j ), applying a marking (3) on at least one side of the support film so as to form a marking layer (2) - affix a sewing adhesive (5) against the marking layer (2).