EP2468127B1 - Jewellery item and method for manufacturing such an item - Google Patents
Jewellery item and method for manufacturing such an item Download PDFInfo
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- EP2468127B1 EP2468127B1 EP20110193937 EP11193937A EP2468127B1 EP 2468127 B1 EP2468127 B1 EP 2468127B1 EP 20110193937 EP20110193937 EP 20110193937 EP 11193937 A EP11193937 A EP 11193937A EP 2468127 B1 EP2468127 B1 EP 2468127B1
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- microfibers
- elastomer
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- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C27/00—Making jewellery or other personal adornments
- A44C27/001—Materials for manufacturing jewellery
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C5/00—Bracelets; Wrist-watch straps; Fastenings for bracelets or wrist-watch straps
- A44C5/0053—Flexible straps
Definitions
- the present invention relates to jewelery pieces.
- the invention also relates to a method of manufacturing such parts.
- a piece of jewelry refers to any object of adornment, but also components used in the watch industry or in jewelery. More particularly, the invention relates to bracelets, such as watch bracelets.
- the patent GB 2,349,239 discloses a watch case made of a composite material comprising a polymer matrix, such as epoxy or polyester, and fibers. No precise composition is however indicated. In addition, the specifications of a watch case does not correspond to the specifications of a bracelet for example.
- An object of the present invention is therefore to overcome these disadvantages, by providing jewelry parts to use materials compatible with FDA standards or the Reach standard while having properties to meet their specifications.
- a piece of jewelry at least partially made of a composite material comprising an elastomeric matrix in which are dispersed reinforcing fillers selected from the group comprising microfibers, polytetrafluoroethylene nanoparticles, and mixtures thereof, said composite material being obtained from a composition comprising between 60% and 95% by weight of at least one elastomer, between 0% and 5% by weight of microfibers and between 0% and 40% by weight of polytetrafluoroethylene nanoparticles, relative to the total weight of the composition, at least one of said reinforcing fillers being present.
- Such a composition makes it possible to obtain, particularly during the injection manufacturing process, structures such as watch straps with holes, because of interesting mechanical properties (rigidity) and good distribution of the fibers.
- the piece of jewelery is made from a composition comprising at least one elastomer and reinforcing fillers chosen from the group comprising microfibers, polytetrafluoroethylene nanoparticles, and mixtures thereof.
- the elastomer is selected from the group consisting of nitrile elastomers and fluoroelastomers.
- fluoroelastomers is used in the general sense independently of the fluorine content and refers to both fluorinated elastomers whose main chain is partially substituted, ie fluoroelastomers commonly known as FKM, as well as fluorinated elastomers whose main chain is entirely substituted, that is to say the perfluoroelastomers commonly called FFKM.
- FKM fluorinated elastomers
- FFKM perfluoroelastomers
- These elastomers may be used alone or in admixture with other suitable elastomers or types of FKM or FFKM.
- Fluoroelastomers are amorphous polymers having a glass transition temperature below room temperature (25 ° C). They are distinguished from plastic polymers, such as PTFE. PTFE is a rigid thermoplastic polymer and not an elastomer.
- the elastomer is a fluoroelastomer, and more preferably a fluoroelastomer of FKM type.
- the amount of elastomer is between 60% and 95% by weight, preferably between 70% and 90% by weight relative to the total weight of the composition.
- the reinforcing fillers are microfibres.
- the composition according to the invention comprises between 0.1% and 4%, preferably between 0.2% and 2%, more preferably between 0.4% and 1.5%, and still more preferably between 0, 5% and 1.25% by weight of microfibers relative to the total weight of the composition.
- the fibers used are microfibers defined by their average length of between 10 ⁇ m and 2 mm and by their mean diameter of between 50 ⁇ m and 0.5 mm.
- the fibers are selected from the group consisting of aramid based fibers, wood fibers, glass fibers, carbon fibers and mixtures thereof.
- aramid or Kevlar®-based fibers are used. These fibers may be incorporated into a masterbatch.
- the masterbatch is chosen to meet FDA or Reach standards.
- the average length / mean diameter ratio of the fibers is between 20 and 150 and preferably between 40 and 100. More preferably, short fibers are used, with a mean length / mean diameter ratio greater than 50.
- the reinforcing fillers are nanoparticles of polytetrafluoroethylene (PTFE).
- PTFE polytetrafluoroethylene
- the composition preferably comprises between 10% and 40%, preferably between 15% and 35%, more preferably between 20% and 30% by weight of polytetrafluoroethylene nanoparticles relative to the total weight of the composition.
- the nanoparticles of polytetrafluoroethylene may be incorporated into a masterbatch.
- the masterbatch is chosen to meet FDA or Reach standards.
- the PTFE nanoparticles may for example be generated in situ during the synthesis of the elastomer in order to have an interfacial connection of a chemical nature. More specifically, it is possible to use as an elastomer for the composition used in the invention, a fluoroelastomer comprising such nanoparticles of PTFE generated in situ such as Tecnoflon® elastomers produced according to the patented technology according to the patent EP 1031607 to Solvay Solexis .
- microfibers and nanoparticles of PTFE can be used as a mixture.
- fillers can be considered such as silica or carbon black.
- the composition may also comprise vulcanizing or crosslinking agents specific to the elastomer, and other conventional additives commonly used by those skilled in the field of elastomer-based formulations, and more particularly fluoroelastomer-based formulations.
- the crosslinking agents may be of the peroxide type, the concentration being optimized according to the practices known to those skilled in the art.
- the composition may further comprise a coloring agent, such as a dye or, preferably, a pigment.
- a coloring agent such as a dye or, preferably, a pigment. Mixtures of dyes and / or pigments can be used.
- PTFE nanoparticles will be used for lightly loaded colors, such as light or pastel colors, and microfibers for charged colors, such as dark or bright colors.
- the molding can be done by any known method, such as injection or compression.
- the vulcanization (or cooking) is conducted in a known manner at a temperature generally between 130 ° C and 200 ° C, for a sufficient time that can vary depending on the room, for example between 60 and 300 seconds depending in particular on the cooking temperature, adopted vulcanization system and the kinetics of vulcanization of the composition.
- a piece of jewelry according to the invention has improved mechanical strength. Furthermore, it has been observed, surprisingly, that the process according to the invention allows an improvement of the manufacturing process, namely a decrease in scrap. In addition, it has been observed a productivity gain with a decrease in the vulcanization time.
- the piece of jewelry may be for example a bracelet, including a watch band. More specifically, a bracelet according to the invention may have particular shapes and cuts and nevertheless meet a stringent specifications in terms of mechanical strength, and more specifically in terms of tensile strength.
- the present invention makes it possible to use fluoroelastomers, especially of the FKM type, which are compatible with FDA standards and the Reach standard.
- Samples according to the invention were made with a FKM elastomer and 0.5%, 1.25% and 2% of Kevlar® microfibers. For comparison, a sample was made without microfiber.
- the curves representing the stress as a function of the deformation are represented on the figure 1 .
- the evolution of the stress is here given for deformations less than 150%, range of deformation in which the parts generally work at the macroscopic level.
- Curve A corresponds to 0% microfibers
- curve B corresponds to 0.5% microfibers
- curve C corresponds to 1.25% microfibers
- curve D corresponds to 2% microfibers.
- Samples in accordance with the invention were made with a FKM elastomer (to be specified) and 0.5% by weight of Kevlar® microfibers. For comparison, a sample was made without microfiber.
- the samples are rectangular specimens 20 mm wide and 3 mm thick. Rectangular holes spaced of different lengths were made in these specimens so as to simulate barb holes in a bracelet.
- the holes have a dimension of 4x2.5 mm, with a radius of curvature of 0.2.
- the letters A and B respectively represent the samples without and with microfibers.
- the gain in tensile strength is 31%
- the gain in holding tensile strength is 12%
- the gain in tensile strength is 43%
- the gain in holding at the traction is 48%.
- Samples according to the invention were made with a Solvay Solexis FKM Tecnoflon® elastomer comprising 23% by weight of PTFE nanoparticles. For comparison, a sample was made without nanoparticles.
- the samples are rectangular specimens 20 mm wide and 3 mm thick. Circular holes, 2 mm in diameter, and spaced of different lengths were made in these specimens so as to simulate barb holes in a bracelet.
- the curve comprising diamonds corresponds to the samples without nanoparticles and the curve comprising squares corresponds to the samples with nanoparticles of PTFE according to the invention.
- microfibers and / or nanoparticles of PTFE associated with a fluoroelastomer-type elastomer makes it possible to obtain a piece of jewelery such as a watch bracelet that may have particular shapes and cutouts and still respond to a severe specifications in terms of mechanical strength, and more specifically in terms of tensile strength, and in terms of compatibility with FDA standards and the Reach standard.
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Description
La présente invention se rapporte à des pièces de bijouterie. L'invention concerne également un procédé de fabrication de telles pièces.The present invention relates to jewelery pieces. The invention also relates to a method of manufacturing such parts.
Dans la présente invention, pièce de bijouterie désigne tout objet de parure, mais également des composants utilisés dans l'horlogerie ou dans la joaillerie. Plus particulièrement, l'invention concerne des bracelets, tels que des bracelets de montre.In the present invention, a piece of jewelry refers to any object of adornment, but also components used in the watch industry or in jewelery. More particularly, the invention relates to bracelets, such as watch bracelets.
Il est déjà connu de réaliser certains composants utilisés dans la bijouterie, et plus spécifiquement dans l'horlogerie, à partir d'une composition comprenant un polymère et des fibres. Par exemple, le brevet
Le brevet
Par ailleurs, les polymères utilisés jusqu'à présent ne sont généralement pas compatibles avec les normes de la FDA ou la norme Reach. De ce fait, les pièces, telles que les bracelets, en contact avec la peau, ne sont pas non plus compatibles avec ces normes.In addition, the polymers used so far are generally not compatible with FDA or Reach standards. As a result, parts, such as bracelets, in contact with the skin, are not compatible with these standards either.
Un but de la présente invention est donc de pallier ces inconvénients, en proposant des pièces de bijouterie permettant d'utiliser des matériaux compatibles avec les normes de la FDA ou la norme Reach tout en présentant des propriétés permettant de répondre à leur cahier des charges.An object of the present invention is therefore to overcome these disadvantages, by providing jewelry parts to use materials compatible with FDA standards or the Reach standard while having properties to meet their specifications.
A cet effet, il est proposé une pièce de bijouterie, au moins partiellement réalisée en un matériau composite comprenant une matrice élastomère dans laquelle sont dispersées des charges de renfort choisies parmi le groupe comprenant des microfibres, des nanoparticules de polytétrafluoroéthylène, et leurs mélanges, ledit matériau composite étant obtenu à partir d'une composition comprenant entre 60% et 95% en poids d'au moins un élastomère, entre 0% et 5% en poids de microfibres et entre 0% et 40% en poids de nanoparticules de polytétrafluoroéthylène, par rapport au poids total de la composition, au moins l'une desdites charges de renfort étant présente.For this purpose, it is proposed a piece of jewelry, at least partially made of a composite material comprising an elastomeric matrix in which are dispersed reinforcing fillers selected from the group comprising microfibers, polytetrafluoroethylene nanoparticles, and mixtures thereof, said composite material being obtained from a composition comprising between 60% and 95% by weight of at least one elastomer, between 0% and 5% by weight of microfibers and between 0% and 40% by weight of polytetrafluoroethylene nanoparticles, relative to the total weight of the composition, at least one of said reinforcing fillers being present.
Une telle composition permet d'obtenir, notamment lors du processus de fabrication par injection, des structures telles que des bracelets de montre avec trous, du fait de propriétés mécaniques intéressantes (rigidité) et une bonne répartition des fibres.Such a composition makes it possible to obtain, particularly during the injection manufacturing process, structures such as watch straps with holes, because of interesting mechanical properties (rigidity) and good distribution of the fibers.
La présente invention concerne également un procédé de fabrication d'une pièce de bijouterie telle que définie ci-dessus et comprenant les étapes suivantes:
- a) préparation d'une composition comprenant au moins un élastomère et des charges de renfort choisies parmi le groupe comprenant des microfibres, des nanoparticules de polytétrafluoroéthylène, et leurs mélanges, la quantité d'élastomère étant comprise entre 60% et 95% en poids, la quantité de microfibres étant comprise entre 0% et 5% en poids et la quantité de nanoparticules de polytétrafluoroéthylène étant comprise entre 0% et 40% en poids, par rapport au poids total de la composition, au moins l'une desdites charges de renfort étant présente
- b) moulage de la composition obtenue à l'étape a), et
- c) post-étuvage.
- a) preparing a composition comprising at least one elastomer and reinforcing fillers chosen from the group comprising microfibers, polytetrafluoroethylene nanoparticles, and mixtures thereof, the amount of elastomer being between 60% and 95% by weight, the amount of microfibers being between 0% and 5% by weight and the amount of polytetrafluoroethylene nanoparticles being between 0% and 40% by weight, relative to the total weight of the composition, at least one of said reinforcing fillers; being present
- b) molding the composition obtained in step a), and
- c) post-steaming.
L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée à titre d'exemple et faite en référence aux dessins dans lesquels :
- la
figure 1 représente des essais de traction simple (norme ISO 37) sur des échantillons conformes à l'invention, les charges de renfort étant des fibres ; - la
figure 2 représente des essais de tenue à la traction sur des échantillons conformes à l'invention et comparatif comprenant des trous d'ardillons, les charges de renfort étant des fibres, et - la
figure 3 représente des essais de tenue à la traction sur des échantillons conformes à l'invention et comparatif comprenant des trous d'ardillons, les charges de renfort étant des nanoparticules de polytétrafluoroéthylène.
- the
figure 1 represents simple tensile tests (ISO 37 standard) on samples according to the invention, the reinforcing fillers being fibers; - the
figure 2 represents tensile strength tests on samples according to the invention and comparative comprising barb holes, the reinforcing fillers being fibers, and - the
figure 3 represents tensile strength tests on samples according to the invention and comparative comprising barb holes, the reinforcing fillers being nanoparticles of polytetrafluoroethylene.
Selon l'invention, la pièce de bijouterie est réalisée à partir d'une composition comprenant au moins un élastomère et des charges de renfort choisies parmi le groupe comprenant des microfibres, des nanoparticules de polytétrafluoroéthylène, et leurs mélanges.According to the invention, the piece of jewelery is made from a composition comprising at least one elastomer and reinforcing fillers chosen from the group comprising microfibers, polytetrafluoroethylene nanoparticles, and mixtures thereof.
De préférence, l'élastomère est choisi parmi le groupe comprenant les élastomères nitriles et les fluoroélastomères.Preferably, the elastomer is selected from the group consisting of nitrile elastomers and fluoroelastomers.
Dans la présente invention, le terme « fluoroélastomères » est utilisé au sens général indépendamment de la teneur en fluor et désigne à la fois les élastomères fluorés dont la chaine principale est partiellement substituée, c'est-à-dire les fluoroélastomères communément appelés FKM, ainsi que les élastomères fluorés dont la chaine principale est entièrement substituée, c'est-à-dire les perfluoroélastomères communément appelés FFKM. Ces élastomères peuvent être utilisés seuls ou en mélange avec d'autres élastomères appropriés ou types de FKM ou FFKM. Les fluoroélastomères sont des polymères amorphes présentant une température de transition vitreuse inférieure à la température ambiante (25°C). Ils sont à distinguer des polymères plastiques, tel que le PTFE. Le PTFE est un polymère thermoplastique rigide et non un élastomère.In the present invention, the term "fluoroelastomers" is used in the general sense independently of the fluorine content and refers to both fluorinated elastomers whose main chain is partially substituted, ie fluoroelastomers commonly known as FKM, as well as fluorinated elastomers whose main chain is entirely substituted, that is to say the perfluoroelastomers commonly called FFKM. These elastomers may be used alone or in admixture with other suitable elastomers or types of FKM or FFKM. Fluoroelastomers are amorphous polymers having a glass transition temperature below room temperature (25 ° C). They are distinguished from plastic polymers, such as PTFE. PTFE is a rigid thermoplastic polymer and not an elastomer.
De préférence, l'élastomère est un fluoroélastomère, et plus préférentiellement un fluoroélastomère de type FKM.Preferably, the elastomer is a fluoroelastomer, and more preferably a fluoroelastomer of FKM type.
La quantité d'élastomère est comprise entre 60% et 95% en poids, de préférence entre 70% et 90% en poids par rapport au poids total de la composition.The amount of elastomer is between 60% and 95% by weight, preferably between 70% and 90% by weight relative to the total weight of the composition.
Selon une première variante de réalisation, les charges de renfort sont des microfibres. De préférence, la composition selon l'invention comprend entre 0,1% et 4%, de préférence entre 0,2% et 2%, plus préférentiellement entre 0,4% et 1,5%, et plus préférentiellement encore entre 0,5% et 1,25% en poids de microfibres par rapport au poids total de la composition.According to a first variant embodiment, the reinforcing fillers are microfibres. Preferably, the composition according to the invention comprises between 0.1% and 4%, preferably between 0.2% and 2%, more preferably between 0.4% and 1.5%, and still more preferably between 0, 5% and 1.25% by weight of microfibers relative to the total weight of the composition.
Dans la présente invention, les fibres utilisées sont des microfibres définies par leur longueur moyenne comprise entre 10 µm et 2 mm et par leur diamètre moyen compris entre 50 µm et 0.5 mm.In the present invention, the fibers used are microfibers defined by their average length of between 10 μm and 2 mm and by their mean diameter of between 50 μm and 0.5 mm.
D'une manière avantageuse, les fibres sont choisies parmi le groupe comprenant les fibres à base aramide, les fibres de bois, les fibres de verre, les fibres de carbone et leurs mélanges. De préférence, on utilise des fibres à base aramide ou Kevlar®. Ces fibres peuvent se présenter incorporées dans un mélange maitre. De préférence, le mélange maitre est choisi pour répondre aux normes de la FDA ou à la norme Reach.Advantageously, the fibers are selected from the group consisting of aramid based fibers, wood fibers, glass fibers, carbon fibers and mixtures thereof. Preferably, aramid or Kevlar®-based fibers are used. These fibers may be incorporated into a masterbatch. Preferably, the masterbatch is chosen to meet FDA or Reach standards.
De préférence, le rapport longueur moyenne/diamètre moyen des fibres est compris entre 20 et 150 et de préférence comprise entre 40 et 100. Plus préférentiellement, on utilise des fibres courtes, avec un rapport longueur moyenne/diamètre moyen supérieur à 50.Preferably, the average length / mean diameter ratio of the fibers is between 20 and 150 and preferably between 40 and 100. More preferably, short fibers are used, with a mean length / mean diameter ratio greater than 50.
Selon une autre variante de réalisation, les charges de renfort sont des nanoparticules de polytétrafluoroéthylène (PTFE). La composition comprend de préférence entre 10% et 40%, de préférence entre 15% et 35%, plus préférentiellement entre 20% et 30% en poids de nanoparticules de polytétrafluoroéthylène par rapport au poids total de la composition.According to another variant embodiment, the reinforcing fillers are nanoparticles of polytetrafluoroethylene (PTFE). The composition preferably comprises between 10% and 40%, preferably between 15% and 35%, more preferably between 20% and 30% by weight of polytetrafluoroethylene nanoparticles relative to the total weight of the composition.
Les nanoparticules de polytétrafluoroéthylène peuvent se présenter incorporées dans un mélange maitre. De préférence, le mélange maitre est choisi pour répondre aux normes de la FDA ou à la norme Reach.The nanoparticles of polytetrafluoroethylene may be incorporated into a masterbatch. Preferably, the masterbatch is chosen to meet FDA or Reach standards.
Les nanoparticules de PTFE peuvent être par exemple générées in situ durant la synthèse de l'élastomère afin d'avoir une connexion interfaciale de nature chimique. Plus spécifiquement, il est possible d'utiliser comme élastomère pour la composition utilisée dans l'invention, un élastomère fluoré comprenant de telles nanoparticules de PTFE générées in situ tels que les élastomères Tecnoflon® produits selon la technologie brevetée d'après le brevet
Il est bien évident que les microfibres et les nanoparticules de PTFE peuvent être utilisées en mélange.It is obvious that microfibers and nanoparticles of PTFE can be used as a mixture.
D'autres charges peuvent être considérées telles que la silice ou le noir de carbone.Other fillers can be considered such as silica or carbon black.
La composition peut comprendre également des agents de vulcanisation ou de réticulation propres à l'élastomère, et autres additifs traditionnels communément utilisé par l'homme du métier dans le domaine des formulations à base d'élastomère, et plus particulièrement des formulations à base de fluoroélastomère. Les agents de réticulation peuvent être de type peroxyde, la concentration étant optimisée selon les pratiques connues de l'homme du métier.The composition may also comprise vulcanizing or crosslinking agents specific to the elastomer, and other conventional additives commonly used by those skilled in the field of elastomer-based formulations, and more particularly fluoroelastomer-based formulations. . The crosslinking agents may be of the peroxide type, the concentration being optimized according to the practices known to those skilled in the art.
Avantageusement, la composition peut comprendre en outre un agent colorant, tel qu'un colorant ou de préférence un pigment. Des mélanges de colorants et/ou de pigments peuvent être utilisés.Advantageously, the composition may further comprise a coloring agent, such as a dye or, preferably, a pigment. Mixtures of dyes and / or pigments can be used.
De préférence, on utilisera les nanoparticules de PTFE pour des couleurs peu chargées, telles que des couleurs claires ou pastel, et des microfibres pour des couleurs chargées, telles que des couleurs foncées ou vives.Preferably, PTFE nanoparticles will be used for lightly loaded colors, such as light or pastel colors, and microfibers for charged colors, such as dark or bright colors.
La pièce de bijouterie selon l'invention est obtenue par un procédé comprenant les étapes suivantes :
- a) préparation d'une composition telle que définie ci-dessus,
- b) moulage de la composition obtenue à l'étape a) pour obtenir la forme désirée, et
- c) post-étuvage.
- a) preparation of a composition as defined above,
- b) molding the composition obtained in step a) to obtain the desired shape, and
- c) post-steaming.
Le moulage peut se faire par tout procédé connu, tel qu'en injection ou en compression. La vulcanisation (ou cuisson) est conduite de manière connue à une température généralement comprise entre 130°C et 200°C, pendant un temps suffisant qui peut varier en fonction de la pièce, par exemple entre 60 et 300 secondes en fonction notamment de la température de cuisson, du système de vulcanisation adopté et de la cinétique de vulcanisation de la composition.The molding can be done by any known method, such as injection or compression. The vulcanization (or cooking) is conducted in a known manner at a temperature generally between 130 ° C and 200 ° C, for a sufficient time that can vary depending on the room, for example between 60 and 300 seconds depending in particular on the cooking temperature, adopted vulcanization system and the kinetics of vulcanization of the composition.
Une pièce de bijouterie selon l'invention présente une tenue mécanique améliorée. Par ailleurs, il a été observé, d'une manière surprenante, que le procédé selon l'invention permettait une amélioration du processus de fabrication, à savoir une baisse du rebut. De plus, il a été observé un gain de productivité avec une diminution de la durée de vulcanisation.A piece of jewelry according to the invention has improved mechanical strength. Furthermore, it has been observed, surprisingly, that the process according to the invention allows an improvement of the manufacturing process, namely a decrease in scrap. In addition, it has been observed a productivity gain with a decrease in the vulcanization time.
La pièce de bijouterie peut être par exemple un bracelet, notamment un bracelet de montre. Plus spécifiquement, un bracelet selon l'invention peut présenter des formes et des découpes particulières et répondre malgré tout à un cahier des charges sévère en termes de tenue mécanique, et plus spécifiquement en termes de résistance à la traction. La présente invention permet d'utiliser des fluoroélastomères, notamment de type FKM, compatibles avec les normes FDA et la norme Reach.The piece of jewelry may be for example a bracelet, including a watch band. More specifically, a bracelet according to the invention may have particular shapes and cuts and nevertheless meet a stringent specifications in terms of mechanical strength, and more specifically in terms of tensile strength. The present invention makes it possible to use fluoroelastomers, especially of the FKM type, which are compatible with FDA standards and the Reach standard.
Exemple 1 :Example 1
Des échantillons conformes à l'invention ont été réalisés, avec un élastomère FKM et 0,5%, 1,25% et 2% de microfibres de Kevlar®. A titre comparatif, un échantillon a été réalisé sans microfibre.Samples according to the invention were made with a FKM elastomer and 0.5%, 1.25% and 2% of Kevlar® microfibers. For comparison, a sample was made without microfiber.
Les courbes représentant la contrainte en fonction de la déformation sont représentées sur la
L'évolution de la contrainte est ici donnée pour des déformations inférieures à 150%, gamme de déformation dans laquelle travaillent généralement les pièces au niveau macroscopique.The evolution of the stress is here given for deformations less than 150%, range of deformation in which the parts generally work at the macroscopic level.
La courbe A correspond à 0% de microfibres, la courbe B correspond à 0,5% de microfibres, la courbe C correspond à 1,25% de microfibres et la courbe D correspond à 2% de microfibres.Curve A corresponds to 0% microfibers, curve B corresponds to 0.5% microfibers, curve C corresponds to 1.25% microfibers and curve D corresponds to 2% microfibers.
La rigidité croissante de par l'introduction des fibres en plus grande concentration permet au fabricant utilisant cette technologie d'optimiser la tenue mécanique d'une structure donnée. Toutefois, il apparait de manière surprenante un optimum au niveau de la concentration de fibres, donné par de meilleurs résultats relatifs aux critères observés, en particulier l'injectabilité, le taux de rebuts, et la tenue mécanique.The increasing rigidity of the introduction of fibers in greater concentration allows the manufacturer using this technology to optimize the mechanical strength of a given structure. However, it appears so surprisingly an optimum level of fiber concentration, given by better results relative to the criteria observed, in particular the injectability, the scrap rate, and the mechanical strength.
Exemple 2 :Example 2
Des échantillons conformes à l'invention ont été réalisés avec un élastomère FKM (à préciser) et 0,5% en poids de microfibres de Kevlar®. A titre comparatif, un échantillon a été réalisé sans microfibre.Samples in accordance with the invention were made with a FKM elastomer (to be specified) and 0.5% by weight of Kevlar® microfibers. For comparison, a sample was made without microfiber.
Les échantillons sont des éprouvettes rectangulaires de largeur 20 mm et d'épaisseur 3 mm. Des trous rectangulaires espacés de longueurs différentes ont été réalisés dans ces éprouvettes de manière à simuler des trous d'ardillons dans un bracelet. Les trous ont une dimension de 4x2.5 mm, avec un rayon de courbure de 0,2.The samples are
Les résultats apparaissent sur la
Les lettres A et B représentent respectivement les échantillons sans et avec microfibres.The letters A and B respectively represent the samples without and with microfibers.
Les résultats montrent que, grâce à la présence de microfibres, pour une distance entre les trous de 3,5 mm, le gain en tenue à la traction est de 31 %, pour une distance entre les trous de 3 mm, le gain en tenue à la traction est de 12%, pour une distance entre les trous de 2,5 mm, le gain en tenue à la traction est de 43% et pour une distance entre les trous de 1,5 mm, le gain en tenue à la traction est de 48%.The results show that, thanks to the presence of microfibres, for a distance between the holes of 3.5 mm, the gain in tensile strength is 31%, for a distance between the holes of 3 mm, the gain in holding tensile strength is 12%, for a distance between the holes of 2.5 mm, the gain in tensile strength is 43% and for a distance between the holes of 1.5 mm, the gain in holding at the traction is 48%.
Exemple 3 :Example 3
Des échantillons conformes à l'invention ont été réalisés avec un élastomère Tecnoflon® de Solvay Solexis FKM comprenant 23% en poids de nanoparticules de PTFE. A titre comparatif, un échantillon a été réalisé sans nanoparticules.Samples according to the invention were made with a Solvay Solexis FKM Tecnoflon® elastomer comprising 23% by weight of PTFE nanoparticles. For comparison, a sample was made without nanoparticles.
Les échantillons sont des éprouvettes rectangulaires de largeur 20 mm et d'épaisseur 3 mm. Des trous circulaires, de diamètre de 2 mm, et espacés de longueurs différentes ont été réalisés dans ces éprouvettes de manière à simuler des trous d'ardillons dans un bracelet.The samples are
Les résultats apparaissent sur la
La courbe comprenant des losanges correspond aux échantillons sans nanoparticules et la courbe comprenant des carrés correspond aux échantillons avec nanoparticules de PTFE selon l'invention.The curve comprising diamonds corresponds to the samples without nanoparticles and the curve comprising squares corresponds to the samples with nanoparticles of PTFE according to the invention.
Les résultats montrent que, grâce à la présence de nanoparticules de PTFE, on améliore la tenue à la traction quelle que soit la distance entre les trous.The results show that, thanks to the presence of PTFE nanoparticles, the tensile strength is improved irrespective of the distance between the holes.
Ainsi, l'utilisation de microfibres et/ou de nanoparticules de PTFE associées à un élastomère de type fluoroélastomère permet d'obtenir une pièce de bijouterie telle qu'un bracelet de montre pouvant présenter des formes et des découpes particulières et répondre malgré tout à un cahier des charges sévère en termes de tenue mécanique, et plus spécifiquement en termes de résistance à la traction, et en terme de compatibilité avec les normes FDA et la norme Reach.Thus, the use of microfibers and / or nanoparticles of PTFE associated with a fluoroelastomer-type elastomer makes it possible to obtain a piece of jewelery such as a watch bracelet that may have particular shapes and cutouts and still respond to a severe specifications in terms of mechanical strength, and more specifically in terms of tensile strength, and in terms of compatibility with FDA standards and the Reach standard.
Claims (16)
- A jewelry item, characterized in that it is at least partially made from a composite material comprising an elastomer matrix in which reinforcing fillers are dispersed chosen from among the group comprising microfibers, polytetrafluoroethylene nanoparticles, and mixtures thereof, said composite material being obtained from a composition comprising between 60 wt% and 95 wt% of at least one elastomer, between 0 wt% and 5 wt% of microfibers, and between 0 wt% and 40 wt% of polytetrafluoroethylene nanoparticles, relative to the total weight of the composition, at least one of said reinforcing fillers being present.
- The item according to claim 1, characterized in that the elastomer is a fluoroelastomer.
- The jewelry item according to any one of claims 1 and 2, characterized in that said composite material is obtained from a composition comprising between 0.1 wt% and 4 wt%, preferably between 0.2 wt% and 2 wt%, more preferably between 0.4 wt% and 1.5 wt%, and still more preferably between 0.5 wt% and 1.25 wt% of microfibers relative to the total weight of the composition.
- The item according to any one of the preceding claims, characterized in that the fibers are chosen from among the group comprising aramid fibers, wood fibers, glass fibers, carbon fibers and mixtures thereof.
- The item according to any one of the preceding claims, characterized in that the mean length / mean diameter ratio of the fibers is comprised between 20 and 150, and preferably comprised between 40 and 100.
- The jewelry item according to any one of the preceding claims, characterized in that said composite material is obtained from a composition comprising between 10 wt% and 40 wt%, preferably between 15 wt% and 35 wt%, more preferably between 20 wt% and 30 wt% of polytetrafluoroethylene nanoparticles relative to the total weight of the composition.
- The item according to any one of the preceding claims, characterized in that the material further comprises a coloring agent.
- The item according to any one of the preceding claims, characterized in that the material further comprises cross-linking agents.
- A method for manufacturing a jewelry item according to any one of claims 1 to 8, characterized in that it comprises the following steps:a) preparing a composition comprising at least one elastomer and reinforcing fillers chosen from among the group comprising microfibers, polytetrafluoroethylene nanoparticles and mixtures thereof, the quantity of elastomer being comprised between 60 wt% and 95 wt%, the quantity of microfibers being comprised between 0 wt% and 5 wt%, and the quantity of polytetrafluoroethylene nanoparticles being comprised between 0 wt% and 40 wt%, relative to the total weight of the composition, at least one of said reinforcing fillers being present,b) molding the composition obtained in step a), andc) post-baking.
- The method according to claim 9, characterized in that the elastomer is a fluoroelastomer.
- The method according to any one of claims 9 and 10, characterized in that said composition comprises between 0.1 wt% and 4 wt%, preferably between 0.2 wt% and 2 wt%, more preferably between 0.4 wt% and 1.5 wt%, and still more preferably between 0.5 wt% and 1.25 wt% of microfibers relative to the total weight of the composition.
- The method according to any one of claims 9 to 11, characterized in that the fibers are chosen from among the group comprising aramid fibers, wood fibers, glass fibers, carbon fibers and mixtures thereof.
- The method according to any one of claims 9 to 12, characterized in that the mean length / mean diameter ratio of the fibers is comprised between 20 and 150, and preferably comprised between 40 and 100.
- The method according to any one of claims 9 to 13, characterized in that said composition comprises between 10 wt% and 40 wt%, preferably between 15 wt% and 35 wt%, more preferably between 20 wt% and 30 wt% of polytetrafluoroethylene nanoparticles relative to the total weight of the composition.
- The method according to any one of claims 9 to 13, characterized in that the composition further comprises a coloring agent.
- The method according to any one of claims 9 to 15, characterized in that the composition further comprises cross-linking agents.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH02165/10A CH704268A2 (en) | 2010-12-23 | 2010-12-23 | Jewelery piece and method of making such a piece. |
Publications (2)
Publication Number | Publication Date |
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EP2468127A1 EP2468127A1 (en) | 2012-06-27 |
EP2468127B1 true EP2468127B1 (en) | 2014-03-26 |
Family
ID=45350698
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20110193937 Not-in-force EP2468127B1 (en) | 2010-12-23 | 2011-12-16 | Jewellery item and method for manufacturing such an item |
Country Status (2)
Country | Link |
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EP (1) | EP2468127B1 (en) |
CH (1) | CH704268A2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017036642A1 (en) * | 2015-09-03 | 2017-03-09 | Solvay Specialty Polymers Italy S.P.A. | Watch bands |
WO2018167091A1 (en) | 2017-03-14 | 2018-09-20 | Solvay Specialty Polymers Italy S.P.A. | Composition comprising a semi-crystalline vdf polymer and a fluorinated thermoplastic elastomer block copolymer |
EP3714725B1 (en) * | 2019-03-26 | 2023-05-24 | Omega SA | Piece of jewellery made from composite elastomer material |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI734691B (en) * | 2015-09-03 | 2021-08-01 | 義大利商首威專業聚合物義大利公司 | Cable jackets |
EP3178875A1 (en) | 2015-12-11 | 2017-06-14 | The Swatch Group Research and Development Ltd. | Comfortable elastomeric material |
CN109476875A (en) * | 2016-06-13 | 2019-03-15 | 索尔维特殊聚合物意大利有限公司 | Curable fluoroelastomer composition |
EP3741247A1 (en) * | 2019-05-23 | 2020-11-25 | The Swatch Group Research and Development Ltd | Piece of jewellery made from natural elastomer material |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5054299A (en) * | 1990-02-28 | 1991-10-08 | Maveety Susan C | Jewelry, without fasteners, formed by the wearer by bending from a planar configuration into circular and/or other configurations to be worn as a necklace, bracelet, belt, etc, and reformed many times to serve as the same or other jewelry |
FR2680727B1 (en) * | 1991-09-04 | 1993-12-24 | Philippe Rosnoblet | HIGH-END CARBON / GOLD COMPOSITE MATERIALS. |
IT1308627B1 (en) | 1999-02-23 | 2002-01-09 | Ausimont Spa | FLUOROELASTOMERIC COMPOSITIONS. |
GB9908498D0 (en) | 1999-04-15 | 1999-06-09 | Thayer Andrew R | Improvements in or relating to jewellery or the like |
US7575800B2 (en) | 2001-11-02 | 2009-08-18 | Kitagawa Industries Co., Ltd. | Sliding parts, precision parts and timepieces and electronic equipment using the same |
JP2006000147A (en) * | 2004-06-15 | 2006-01-05 | Fuairudo Kk | Health accessory using silicone elastomer and manufacturing method thereof |
US20090175135A1 (en) * | 2007-10-31 | 2009-07-09 | Movado Llc, A Limited Liability Company | Integrated watch band and methods therefor |
-
2010
- 2010-12-23 CH CH02165/10A patent/CH704268A2/en not_active Application Discontinuation
-
2011
- 2011-12-16 EP EP20110193937 patent/EP2468127B1/en not_active Not-in-force
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017036642A1 (en) * | 2015-09-03 | 2017-03-09 | Solvay Specialty Polymers Italy S.P.A. | Watch bands |
WO2018167091A1 (en) | 2017-03-14 | 2018-09-20 | Solvay Specialty Polymers Italy S.P.A. | Composition comprising a semi-crystalline vdf polymer and a fluorinated thermoplastic elastomer block copolymer |
EP3714725B1 (en) * | 2019-03-26 | 2023-05-24 | Omega SA | Piece of jewellery made from composite elastomer material |
Also Published As
Publication number | Publication date |
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EP2468127A1 (en) | 2012-06-27 |
CH704268A2 (en) | 2012-06-29 |
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