Process for manufacturing a false nail

Abstract

The present invention relates to a process for manufacturing a false nail, comprising the following steps: a) producing by additive manufacture, from 3D digital data originating from the acquisition of a relief, especially that of the finger intended to receive the false nail, a mold using a first material, b) depositing onto the mold a layer formed from at least one adhesive composition, c) depositing onto the mold at least one layer of a coating of a second material, different from the first, so as to form the false nail.

Claims

1. A process for manufacturing a fake nail, comprising: a) producing by additive manufacture, from 3D digital data originating from the acquisition of a relief of a finger intended to receive the false nail, a mold using a first material, b) depositing onto said mold a layer formed from at least one adhesive composition, the deposition of the adhesive composition being performed by a method selected from the group consisting of 2D printing, 3D printing, spraying, dipping and transfer, and c) after implementing b), depositing onto said mold at least one layer of a coating of a second material, different from the first, so as to at least partly cover the layer of adhesive composition and to form the false nail, the deposition of the coating being performed with a method selected from the group consisting of thermoforming, 2D printing, 3D printing, injection, dipping and transfer.

2. The process as claimed in claim 1, further comprising extracting the false nail from the mold by at least one of physical and chemical degradation of at least part of the mold.

3. The process as claimed in claim 2, wherein the at least one of the physical and chemical degradation is at least partly performed by heating at least part of the first material.

4. The process as claimed in claim 2, wherein the at least one of the physical and chemical degradation at least partly is a mechanical degradation consisting in hollowing out.

5. The process as claimed in claim 2, wherein the at least one of the physical and chemical degradation is at least partly a chemical degradation, consisting of selective dissolution of the first material using a solvent that is inert toward the adhesive composition and the second material.

6. The process as claimed in claim 5, wherein said solvent is chosen from alkanes, ketones, ethers, and esters.

7. The process as claimed in claim 1, wherein the depositing the coating onto the mold is performed so as to cover at least one zone of the mold not covered with the layer of adhesive composition.

8. The process as claimed in claim 1, wherein b) and c) of the process are performed such that the layer of adhesive composition has a different pattern from that formed by the coating.

9. The process as claimed in claim 8, wherein the layer of adhesive composition forms a pattern extending over all or part of the periphery of the pattern formed by the coating.

10. The process as claimed in claim 1, wherein the second material is, before deposition onto the mold, in solid form, or in liquid form dissolved partially or totally crosslinked.

11. The process as claimed in claim 1, further comprising a step of cutting-out of the false nail.

12. The process as claimed in claim 11, wherein the cutting-out of the false nail is performed manually or automatically.

13. The process as claimed in claim 1, in which the acquisition of the relief comprises scanning of the end of a user's finger, followed by isolation of a nail part of said scan resulting in the creation of 3D digital data, and the creation of a 3D object forming the mold from the 3D digital data.

14. The process as claimed in claim 1, wherein the first material is a hot-melt material.

15. The process as claimed in claim 14, wherein said hot-melt material has a melting point between 45? C. and 200? C.

16. The process as claimed in claim 15, wherein the hot-melt material is chosen from waxes, thermoplastic polymers and/or semicrystalline polymers.

17. The process as claimed in claim 1, wherein the adhesive composition comprises at least one adhesive compound and a solvent.

18. The process as claimed in claim 17, wherein the adhesive compound is chosen from pressure-sensitive adhesives, dissolved adhesives, and glues.

19. The process as claimed in claim 1, wherein the second material different from the first material is chosen from thermoplastic polymers and thermosetting polymers.

20. The process as claimed in claim 19, further comprising exposing the coating layer to the radiation of a lamp.

21. The process as claimed in claim 1, wherein the additive manufacture is 3D printing or stereolithography.

Description

FIGURES

(1) The invention may be better understood on reading the following description of nonlimiting implementation examples thereof, and on examining the attached drawing, in which:

(2) FIG. 1 illustrates various steps of the process according to the invention,

(3) FIG. 2 represents the steps of another process example according to the invention,

(4) FIG. 3 schematically illustrates the use of the process of FIG. 2 for the manufacture of a false nail,

(5) FIG. 4 schematically illustrates in top view a false nail obtained with the aid of a process example according to the invention,

(6) FIG. 5 schematically represents a possible step in the process according to the invention, and

(7) FIG. 6 schematically illustrates in cross section another example of a false nail obtained with the aid of a process according to the invention,

(8) FIG. 7 illustrates various steps of a second process example according to the invention,

(9) FIG. 8 represents the steps of another second process example according to the invention,

(10) FIG. 9 illustrates various steps of a third process example according to the invention,

(11) FIG. 10 represents the steps of another third process example according to the invention,

(12) FIG. 11 represents the steps of another third process example according to the invention,

(13) FIG. 12 is a photograph of a false nail made according to the third process of the invention, shown not positioned on the nail,

(14) FIGS. 13 to 15 are schematic views in cross section of examples of variants of preforms forming a reservoir that may be used for performing the third process according to the invention,

(15) FIG. 16 illustrates various steps of the fourth process according to the invention,

(16) FIG. 17 represents the steps of another fourth process example according to the invention,

(17) FIG. 18 is a schematic top view of the two shells of the mold when not assembled,

(18) FIG. 19 is a schematic top view of a false nail made using the fourth process according to the invention, before finishing,

(19) FIG. 20 is a view similar to FIG. 4, after finishing,

(20) FIG. 21 is a schematic view in cross section of the false nail of FIG. 20, and

(21) FIG. 22 is a schematic view in cross section of another example of a false nail obtained with the aid of the fourth process according to the invention.

(22) FIG. 1 shows various steps of an example of performing a process for manufacturing a false nail according to the invention.

(23) In a step 1, a mold is made. To do this, 3D digital data originating from the acquisition of a relief, especially that of the finger intended to receive the false nail, are taken as the basis, and the mold is manufactured from a first material.

(24) In a step 2, a layer formed from at least one adhesive composition is deposited on the mold.

(25) Finally, in a step 3, at least one layer of a coating of a second material, different from the first, is deposited on the mold so as to form the false nail.

(26) In FIG. 2, besides steps 1, 2 and 3, the process comprises a preliminary step 0 which consists in scanning in three dimensions (3D) the end of the finger, extracting the nail part therefrom and creating a file on this basis for designing the mold corresponding to the relief of the scanned nail. It is on this basis that step 1 allows the production of the mold, by 3D printing of the object thus designed.

(27) The process of FIG. 2 also comprises step 4, which consists, once the false nail has been manufactured with the adhesive composition and the coating, in extracting the false nail from the mold. To do this, the mold may be chemically or physically degraded. This degradation may consist, for example, in hollowing out the mold, for example using a high-pressure water jet cleaner.

(28) Various steps of the process of FIG. 2 are illustrated in FIG. 3. The relief of the end of the finger D bearing the nail O is scanned in step 0 using a scanner 10. A mold 20 is then manufactured in step 1, by 3D printing in this example, from a wax forming the first material. The mold 20, viewed from above and then in profile, comprises a domed zone 21 corresponding to the relief and the contour of the false nail to be manufactured, based on the relief and the contour of the nail O. In the example illustrated, the false nail is intended to be longer than the nail and to extend beyond it, once in place on the nail O. The design of the mold integrates this extension.

(29) In step 2, a layer 22 formed from an adhesive composition is deposited, in this example using a brush as illustrated. Next, step 3 comprises the deposition, also using a brush in this example, of a layer of a coating 23 made of a second material. Step 4 illustrates the physical degradation of the mold, in this example by placing it in an oven at a suitable temperature to melt the wax without impairing the false nail 25 obtained. The false nail 25 is removed, and is ready to be attached to the nail O.

(30) FIG. 4 shows a top view of the false nail 25. In this example, the layer 22 of adhesive composition shown, delimited by dashed lines in this figure, covers only the periphery of the nail O onto which the false nail will be fixed. This makes it possible to have good sealing and good fixing, but also makes it possible to reduce the zone of nail O covered with the adhesive. It should be noted that there is no adhesive on the part 24 of the false nail extending from the nail.

(31) FIG. 5 illustrates the implementation of a step in which, after deposition of the coating layer 23, it is exposed to UV radiation, so as to allow photo-crosslinking and curing of the coating.

(32) In FIG. 3, the false nail obtained has a substantially constant thickness over its entire surface.

(33) The example illustrated in FIG. 6 shows, in cross section, a false nail 25 having a variable thickness, the false nail 25 having patterns 26 in overthickness as visible. The patterns 26 are formed in the coating layer 23. In particular in this case, the manufacture of the coating may be performed by 3D printing on the mold, especially on the layer 22 of adhesive composition.

(34) Needless to say, the invention is not limited to the examples that have just been described. In particular, the degradation of the mold, when this takes place, may be performed chemically.

(35) The layer 22 formed from an adhesive composition may require the prior application to the nail and/or to the layer 22 of another composition to allow adhesion to the nail O.

(36) The pattern of the layer 22 may vary without departing from the scope of the invention.

(37) All or part of the process may be performed by a machine forming a 3D scanner and 3D printing, making it possible to acquire the relief of the end of the finger, to design the mold, to produce it by 3D printing, to deposit the layer 22 of adhesive composition, and to deposit the coating layer 23 onto the layer 22, for example by 3D printing.

(38) A mold 20 may be made for more than one false nail 25, for example for the five false nails that will cover all the nails of a hand. In this case, the mold 20 comprises several domed zones 21 for each of the nails. All the domed zones will then be covered, in steps 2 and 3.

(39) A cutting-out step may be performed after manufacture of the false nail on the mold or outside the mold. The cutting-out may be performed manually or with the aid of a machine, especially automatically, so as to make the contour of the false nail sharp or in a particular desired form.

(40) FIG. 7 shows a first implementation example of the invention according to the second manufacturing process. In this example, the process comprises a step 100 of producing a preform by cutting-out from a coating material comprising at least one partially crosslinked compound. To do this, the developed surface of the nail is first acquired, and it is optionally extended so as to obtain the contour of the preform. This acquisition step may take place via acquisition means and data processing means or may be obtained manually with the aid, for example, of a molding paste that is deposited onto the nail part of a user.

(41) Once the contour of the preform has been determined, it can be printed on a sheet of the coating material and the preform can then be cut out, manually or using a tool, for example a laser or a punch, by following this contour. As a variant, the contour is printed on a support such as a sheet of paper which then serves as a template for cutting out the preform by being superposed with a sheet of the partially crosslinked coating material.

(42) In a step 102, the preform thus produced is then positioned on the nail so as to make it match the shape of the nail.

(43) The crosslinking is then finalized, in a step 103, by exposing the preform to UV radiation. A false nail in accordance with the invention is then obtained.

(44) In the example illustrated in FIG. 8, a step 104 starts the process, consisting in 3D scanning of the end of a user's finger. The nail part is isolated from the scan, and 2D or 3D digital data of the nail are generated and then, by calculation using these 2D or 3D digital data, the developed surface of the nail is determined. The contour of the preform is deduced therefrom, corresponding, for example, to the measured developed surface extended by calculation by 5 mm at the nail end.

(45) In a step 105, the preform is produced by 2D printing according to the contour determined in the preceding step, from a coating material comprising at least one partially crosslinked compound, on a support consisting, for example, of a flexible plastic sheet. It is possible, for example, to print a first layer of coating material comprising a compound crosslinked at 50% of the nominal UV power, and then a second layer on the first layer, comprising a compound crosslinked at 20% of the nominal UV power.

(46) A layer of a UV gel is deposited on the nail, in a step 106. This gel will form an adhesion layer between the nail and the part. Since the part is not 100% crosslinked, bonds will be created between the layer of UV gel and the part during the crosslinking. This will aid the adhesion. Next, the preform is positioned on the nail after having detached it from its support, in a step 107, so that the preform matches the relief of the nail.

(47) Finally, the last step 108 consists in finalizing the crosslinking by exposing the preform to UV radiation.

(48) A false nail solidly attached to the nail is obtained.

(49) FIG. 9 shows steps for performing a first example of the third process according to the invention.

(50) In this example, a preform forming a reservoir, made from a porous material, is first produced in a step 200.

(51) To do this, the developed surface of the nail is acquired, and it is optionally extended so as to obtain the contour desired for the preform.

(52) This acquisition step may take place via acquisition means and data processing means or may be performed manually with the aid, for example, of a molding paste that is deposited onto the nail part of a user, and which is then scanned to generate a 2D data file for the nail, which is used to generate the contour of the preform to be made.

(53) Once the contour of the preform has been determined, the preform can be cut out, manually or using a tool, for example a laser or a punch. The material that is cut out may be the porous material itself or a support which serves as a cutting-out template for producing the preform.

(54) In a step 202, according to this example, a solidifiable composition comprising a crosslinkable reactive compound is deposited on the preform. The deposition may take place using a brush, a sponge or any other manual or non-manual means, for example by printing using a printer.

(55) A first exposure of the preform to UV radiation is then performed, in a step 203, so as to obtain partial crosslinking of the crosslinkable compound of the solidifiable composition.

(56) The process is continued by depositing on the nail the same solidifiable composition in a step 204, and the preform is then positioned on the nail in a step 205. The following step may consist in pressing the preform so as to maintain it on the nail and to conform it to the surface of the nail. Solidification of the solidifiable composition is then performed, in a step 206, via finalization of the crosslinking of the partially crosslinked compound, by performing a second exposure to UV radiation of the preform and nail assembly.

(57) In a second example illustrated in FIG. 10 of performing the third process, step 200 is performed. Next, the preform is not impregnated, but a solidifiable composition comprising a crosslinkable compound is deposited on the nail, in a step 207, for example using a brush.

(58) Step 205 of positioning the preform on the nail, and optionally pressing it, is then performed, so as to make it match the surface of the nail.

(59) In a subsequent step 209, partial crosslinking is performed by exposing the crosslinkable compound to UV radiation, and the solidifiable composition is then deposited on the preform, in a step 210, for example using a brush, and solidification of the solidifiable composition via finalization of the crosslinking is performed, in a step 206, by a second exposure to UV radiation.

(60) In a third example of implementing the invention, the third process, as illustrated in FIG. 11, comprises the following steps.

(61) After step 200 of producing the preform from a porous material, a first solidifiable composition comprising a first non-crosslinkable reactive compound is deposited thereon, in a step 220. A second solidifiable composition comprising a second non-crosslinkable reactive compound is deposited, in a step 221, this time on the nail. The first reactive compound is advantageously capable of reacting with the second non-crosslinkable reactive compound to achieve solidification of the composition chemically.

(62) Step 205 of positioning the preform on the nail and pressing it is then performed, so as to make it match the surface of the nail. In a step 222, the second solidifiable composition is deposited on the preform, and solidification of the solidifiable compositions is performed in a step 223. This last step may involve curing by chemical reaction between the first and second reactive compounds.

(63) It is still possible subsequently to deposit on the false nail securely attached to the nail, manually or by using a machine, for example an additive manufacturing machine, at least one layer of a coating material, such as a varnish or the like, with patterns, one or more colors, a relief or a smooth surface or any other appearance.

(64) FIGS. 13 to 15 show three examples of variants of preforms forming a reservoir.

(65) In FIG. 13, the preform 230 is made so as to form a macroscopic cavity 233 framed with two walls 231 and 232, the cavity 233 being able to receive and house the solidifiable composition. The cavity 233 opens to the exterior via an orifice 234, formed through the wall 231.

(66) In the example of FIG. 14, the preform 230 is made so as to comprise the cavity 233, but this cavity opens to the exterior via a larger number of orifices 234 passing through the wall 231. The wall 231 is intended to come into contact with the nail to make it possible, during the solidification of the composition, also to achieve adhesion between the nail and the preform 230.

(67) In the example of FIG. 15, the preform 230 forming a reservoir is made of a porous material comprising, in this example, fibers 240, capable of retaining the solidifiable composition therein. It should be noted that it would not constitute a departure from the scope of the invention if the preform forming a reservoir were to be made of an alveolar porous material.

(68) FIG. 16 shows various steps of an example of performing the fourth process for manufacturing a false nail according to the invention.

(69) In a step 301, a mold as two shells is made. To do this, 3D digital data originating from the acquisition of a relief, especially that of the finger intended to receive the false nail, are taken as the basis, and the two shells of the mold are manufactured, especially by 3D printing. One of the shells has a convex face toward the interior of the mold to reproduce the curvature of the nail.

(70) In a step 302, at least one layer formed from at least one adhesive composition is deposited on this convex face of one of the shells. Next, in a step 303, after closing the mold, a coating material is injected into the mold cavity, between the shells.

(71) Finally, in a step 304, the false nail thus formed is extracted from the mold.

(72) In FIG. 17, besides steps 301, 302, 303 and 304, the process comprises a preliminary step 300 which consists in scanning in three dimensions (3D) the end of the finger, extracting the nail part therefrom and creating a file on this basis for designing the shells of the mold forming a cavity adapted to the relief of the scanned nail. It is on this basis that step 301 allows the production of the two shells of the mold, by 3D printing.

(73) After deposition in step 302, especially by brush, of at least one layer formed from at least one adhesive composition, the two shells of the mold are assembled together in step 302b is to form the mold cavity. This cavity receives the coating material injected in step 303.

(74) Extraction of the false nail from the mold may take place, especially after cooling, either by opening the mold by disassembling the shells, or by physical and/or chemical degradation of at least one of the shells.

(75) The shells 310 and 311 of the mold are represented schematically in FIG. 18. The shell 310 has a hollow, concave relief 312, having the shape of the exterior face of the false nail that will be obtained. The shell 311 has a protruding, convex relief 313, forming the convex face 314 intended to receive the adhesive composition. The shells 310 and 311 also comprise, to allow their assembly, assembly reliefs 315 and 316, the assembly reliefs 315 being formed, for example, protruding in a complementary manner to the assembly reliefs 316, which, themselves, are formed as hollows. Finally, one of the shells comprises an injection orifice 317, through which the coating material is injected.

(76) FIG. 19 shows the false nail 320 obtained with the aid of the process whose steps are illustrated in FIG. 2, after extraction from the mold. The false nail 320 comprises parts 321 associated with the injection, which are not yet removed. It is moreover possible for its contour to not as yet be definitive. This is why the process according to the invention may comprise a step of deflashing or trimming of these parts 321, which is a finishing step to give the false nail 320 its definitive form, illustrated in FIG. 20.

(77) FIG. 21 is a view in cross section of the false nail 320 of FIG. 20, illustrating the layer 325 of adhesive composition and the layer 326 of coating material. After optional finishing, the false nail 320, already equipped with adhesive, is ready to be positioned on the nail, by placing the nail in contact with the layer 325 of adhesive composition. The layer 326 of coating material is the appearance layer of the false nail 320.

(78) In the example of FIG. 21, the false nail 320 has a substantially constant thickness over its entire surface.

(79) In the example illustrated in FIG. 22, the false nail 320 has patterns 327 in overthickness. These patterns 327 are formed in the coating layer 326, the shell 310 then being advantageously intended to create such patterns 327.

EXAMPLES

Example 1

(80) The end of a person's finger is taken by a 3D scanner. By file data processing, the nail part of the end of the finger is isolated and a 3D file of the surface of the nail is produced. From this 3D file comprising the 3D digital data of the acquisition of the relief of the nail, a mold 3D digital object is created.

(81) The 3D digital data of this mold 3D digital object are then used to produce, via a 3D printer, for example the printer sold under the brand name ProJet? 3500 HDMax by the company 3D Systems, a mold made of a first material formed in this example from wax, especially the wax sold under the brand name VisiJet? S300 by the company 3D Systems.

(82) The adhesive composition is then made with the following mass proportions, relative to the total mass of the composition: Kraton G1701 5%, Regalite R1100CG 15% Kaydol 5% Isoamyl acetate in quantity sufficient for 100%.

(83) A layer of this composition is deposited by brush, on the mold, in a mass amount of about 2.5 mg.

(84) Next, after drying by evaporation, a layer of a second material consisting of a photo-crosslinkable resin, known under the brand name VisiJet? M3 Crystal sold by the company 3D Systems, is deposited by brush so as to cover the whole with a layer 400 ?m thick. The assembly is then illuminated with a UV lamp for 3 minutes. The UV lamp may be the one known under the trade name CND Shellac 36 W.

(85) At the end of the treatment, the wax forming the mold is removed by heating in an oven at 65? C. for 4 hours and the false nail thus manufactured is extracted. The false nail is ready to be attached to the nail.

Example 2

(86) A support is made by 3D printing reproducing five nail molds made of a first material.

(87) This support is then scanned in 2D and the projected surfaces of the nail parts are extracted, omitting all the surfaces between the nail parts.

(88) This file is introduced into a printing machine, for example a printer from the company Scodix. Before introducing the mold into the machine, it is spread, using a brush, with a layer of about 100 ?m of an adhesive composition having the following formula: Kraton G1701 5%, Regalite R1100CG 15% Kaydol 5% Isoamyl acetate qs 100%

(89) The mold thus covered is then placed in the Scodix printer. The Scodix printer is set up, by means of its positioning system. Thus, on the basis of the 2D file, it delivers the photo-polymerizable ink sold under the name PolySENSE? 100 by the company Scodix onto the nail parts of the support.

(90) The machine is controlled so that it prints, with the photo-polymerizable ink forming the second material, the nail surfaces over a thickness of about 250 ?m.

(91) After printing, the whole is subjected to UV irradiation, solidifying the photo-polymerizable ink. Five false nails are obtained. The false nails may be separated from their support.

Example 3

(92) A 3D object is made by additive manufacture, using the Visijet S400 equipment sold by the company 3D Systems. The object is a mold and represents a nail.

(93) A layer of 1 mm of water-based adhesive, known under the brand name Uhu?, is then deposited onto the surface of the mold.

(94) A coating 500 ?m thick is then produced on this coated surface by applying a UV gel known under the brand name CND Shellac Xpress 5 top coat. The whole is placed under a UV lamp for 3 times 1 minute with an interval of one minute between each irradiation. The lamp is known under the brand name CND Shellac 36 W.

(95) The false nail thus obtained is detached from the mold.

Example 4: Implementation of the Second Manufacturing Process According to the Invention

(96) A Scodix brand Series S, S52 Press machine capable of irradiating at 260 and 368 nm is used.

(97) A person's finger is scanned, using acquisition means such as a 3D scanner. The nail part is isolated and its developed surface is determined by creating a 2D file. The 2D file is manipulated so as to extend it by 5 mm in the continuation of the nail.

(98) The Scodix brand printer is then used to deposit a layer of about 100 ?m of coating material onto a plastic sheet, the deposited layer having the contour given by the 2D file.

(99) The coating material may have the following composition:

(100) TABLE-US-00001 Coating material Weight % Adhesive: Methacryloyloxyethyl maleate (HEMA Maleate 7.5 sold by the company Esstech Inc.) Crosslinkable compound: Isophorone Urethane 10.5 Dimethacrylate (X-851-1066 sold by the company Esstech Inc.) PEG-400 Urethane dimethacrylate (X-726-0000 sold by the 30 company Esstech Inc.) Tetrahydrofurfuryl methacrylate (X-958-7446 sold by the 7 company Esstech Inc.) Resin: Methyl methacrylate (MMA)/butyl methacrylate 6.33 (BMA) copolymer (Paraloid B 66 100% sold by the company Dow Chemical) Solvent: Nitrocellulose containing 30% isopropyl alcohol 6.67 (viscosity = E22-?s) (Idyl E35 TX IPA 30% sold by the company Bergerac-SNPE) ethyl acetate 22 butyl acetate 6 Photoinitiator ethyl (2,4,6-trimethylbenzoyl) 4 phenylphosphinate (Lucirin TPO-L sold by the company BASF)

(101) As a variant, the reference photo-crosslinkable ink Polysense 100 from the company Scodix is used as coating material.

(102) This first layer of coating material is crosslinked at 50% of the nominal UV power. Next, a second layer (100 ?m) of the same composition is printed on the same sheet and on the same contour, care being taken to crosslink it at only 20% of the nominal UV power.

(103) The preform thus formed is then detached, placed on a nail treated beforehand with a UV gel sold under the name Shellac? by the company CND, which acts as adhesive, and is then illuminated with a UV lamp so as to finalize the crosslinking.

(104) A false nail which perfectly matches the shape of the nail, which is comfortable to wear and which is longer-lasting than a varnish is obtained.

Example 5: Implementation of the Second Manufacturing Process According to the Invention

(105) The same test as in Example 4 is performed, except that the preform is not detached from its support before application. The support is used as applicator, by bringing the upper face of the preform facing the nail. The preform is then crosslinked by irradiating it through the support. It is not removed until after step 2).

Example 6: Implementation of the Second Manufacturing Process According to the Invention

(106) The same test as in Example 5 is performed, except that the second layer is crosslinked at 10% of the nominal UV power. This makes it possible to gel the layer slightly. Thus, when the part is applied, it does not expel the second layer.

Example 7: Implementation of the Second Manufacturing Process According to the Invention

(107) The same test as in Example 6 is performed, with the exception that the second layer is not crosslinked. This makes it possible to save time, if it is desired to go faster.

Example 8: Implementation of the Third Manufacturing Process According to the Invention

(108) A silicone paste composition for imprints is applied to the nail, which is made by mixing the two components of the resin Silfo sold by the company Monaderm. The composition is carefully adjusted to the contours of the nail. It is left to set to a solid on the nail for 5 minutes. The paste part molded in the shape of the nail is then detached. It is then pressed between two glass slides. A photograph in top view of the pressed part is then taken. A 2D digital file of the developed surface of the nail is thus created, constituting 2D digital data for the nail, and processing of these data is then performed to obtain the desired contour of the preform, including an extension of the nail by a length of 5 mm.

(109) The contour of the preform is printed on a sheet of paper and the printed contour is cut out. The template obtained is used for cutting out a preform of the same size from a porous material formed from a sheet of cellulose.

(110) On the preform is placed a solidifiable composition comprising a crosslinkable reactive compound having the following formula:

(111) TABLE-US-00002 Solidifiable composition Weight % Adhesive: Methacryloyloxyethyl maleate (HEMA Maleate 7.5 sold by the company Esstech Inc.) Crosslinkable reactive compound: Isophorone Urethane 10.5 Dimethacrylate (X-851-1066 sold by the company Esstech Inc.) PEG-400 Urethane dimethacrylate (X-726-0000 sold by the 30 company Esstech Inc.) Tetrahydrofurfuryl methacrylate (X-958-7446 sold by the 7 company Esstech Inc.) Resin: Methyl methacrylate (MMA)/butyl methacrylate 6.33 (BMA) copolymer (Paraloid B 66 100% sold by the company Dow Chemical) Solvent: Nitrocellulose containing 30% isopropyl alcohol 6.67 (viscosity = E22-?s) (Idyl E35 TX IPA 30% sold by the company Bergerac-SNPE) ethyl acetate 22 butyl acetate 6 Photoinitiator ethyl (2,4,6-trimethylbenzoyl) 4 phenylphosphinate (Lucirin TPO-L sold by the company BASF)

(112) The preform is impregnated with this solidifiable composition. A first exposure to UV radiation is performed for 15 seconds.

(113) The same solidifiable composition is deposited on the nail, for example using a brush.

(114) The preform impregnated with the solidifiable composition is then placed with the partially crosslinked reactive compound on the nail. The preform is pressed on the nail. A second exposure to UV radiation is performed for 3 minutes. The false nail 211 illustrated in FIG. 12, but positioned on the nail, is obtained.

Example 9: Implementation of the Third Manufacturing Process According to the Invention

(115) The preform is produced as in Example 8, without, however, impregnating it with the solidifiable composition. The solidifiable composition is deposited on the nail. The non-impregnated preform is then placed on the nail. A first exposure of the whole to UV radiation is performed for 1 minute. This makes it possible to achieve a first rigidity and to partially crosslink the crosslinkable reactive compound of the solidifiable composition.

(116) Thereafter, the whole is covered with a layer of the same solidifiable composition. A second exposure of the whole to UV radiation is performed for 3 minutes. The false nail is obtained.

Example 10: Implementation of the Third Manufacturing Process According to the Invention

(117) As in Example 8, the preform is made of a porous material made from a sheet of cellulose.

(118) The preform is impregnated with a first solidifiable composition formed by the hardener of the Araldite? adhesive.

(119) A formula of a second composition formed by the resin of the Araldite? adhesive is then deposited on the nail.

(120) The impregnated preform is then placed on the nail. It is pressed on.

(121) Finally, a layer of Araldite? adhesive is applied with hardener to the outer surface of the preform. It is left to cure and the false nail is obtained.

Example 11: Implementation of the Fourth Manufacturing Process According to the Invention

(122) The end of a person's finger is taken by a 3D scanner. By file data processing, the nail part of the end of the finger is isolated and a 3D file of the surface of the nail is produced. From this 3D file comprising the 3D digital data of the acquisition of the relief of the nail, a convex shell 3D digital object having the shape of the nail, extended or otherwise, is created. A concave shell 3D object is also created, having the shape that it is desired to give to the upper face of the false nail.

(123) The 3D digital data of these convex shell and concave shell 3D digital objects are then used to produce, via a 3D printer, for example the printer sold under the brand name ProJet? 3500 HDMax by the company 3D Systems, a mold comprising the two shells made of a material formed in this example from a photo-crosslinkable resin sold under the brand name VisiJet? M3 Crystal by the company 3D Systems.

(124) The adhesive composition is then made with the following mass proportions, relative to the total mass of the composition: Kraton G1701 5%, Regalite R1100CG 15% Kaydol 5% Isoamyl acetate in quantity sufficient for 100%.

(125) A layer of this composition is deposited by brush, onto the convex shell, in a mass amount of about 2.5 mg.

(126) After drying, the two shells are assembled together to form the mold and a coating material formed by a thermo-injectable thermoplastic polymer is injected.

(127) After cooling, the false nail comprising the adhesive on its inner face is stripped from the mold. The false nail is then applied to the nail and pressed to fix it on.