EP2452231B1 - Method for manufacturing a decorated part with raised pattern - Google Patents

Method for manufacturing a decorated part with raised pattern Download PDF

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Publication number
EP2452231B1
EP2452231B1 EP10726115.8A EP10726115A EP2452231B1 EP 2452231 B1 EP2452231 B1 EP 2452231B1 EP 10726115 A EP10726115 A EP 10726115A EP 2452231 B1 EP2452231 B1 EP 2452231B1
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EP
European Patent Office
Prior art keywords
bosses
decorative layer
locally
hollows
adherence
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP10726115.8A
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German (de)
French (fr)
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EP2452231A1 (en
Inventor
Juliette Muller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ETA SA Manufacture Horlogere Suisse
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ETA SA Manufacture Horlogere Suisse
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Application filed by ETA SA Manufacture Horlogere Suisse filed Critical ETA SA Manufacture Horlogere Suisse
Priority to EP10726115.8A priority Critical patent/EP2452231B1/en
Publication of EP2452231A1 publication Critical patent/EP2452231A1/en
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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B19/00—Indicating the time by visual means
    • G04B19/06—Dials
    • G04B19/10—Ornamental shape of the graduations or the surface of the dial; Attachment of the graduations to the dial
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/32—Processes for applying liquids or other fluent materials using means for protecting parts of a surface not to be coated, e.g. using stencils, resists
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/22—Removing surface-material, e.g. by engraving, by etching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/24—Pressing or stamping ornamental designs on surfaces
    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D3/00—Watchmakers' or watch-repairers' machines or tools for working materials
    • G04D3/0002—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe
    • G04D3/0043—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe for components of the time-indicating mechanisms
    • G04D3/0048—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe for components of the time-indicating mechanisms for dials

Definitions

  • the invention relates to a method of manufacturing a decorated relief piece and, more particularly, such a plastic piece whose decorations have a metallic appearance.
  • a timepiece dial usually has sconces to decorate it. These appliques may for example represent a time lapse to facilitate the determination of the time relative to the location of the needles of the timepiece. These sconces can also be used to simply bring an aesthetic effect to the dial.
  • these sconces are mounted on the dial by successive steps of gluing and possibly masking and / or buffering which, in addition to the price of the sconces, causes additional manufacturing costs due to the required positioning accuracy which is as much larger than the wall lamp is thick.
  • Such methods are described in the documents US 2,642,390 , JP 6000 4879 , and CH 344374 .
  • the object of the present invention is to overcome all or part of the disadvantages mentioned above by more generally proposing a method of manufacturing a decorated part which has fewer steps and consumes less material to make the decorations.
  • the Figures 1 and 2 represent a typical dial 11 for a timepiece.
  • the method 1 according to the invention is not limited to the manufacture of a dial but to any type of plastic part decorated in relief.
  • a timepiece dial is a good example of application of the method 1 according to the invention.
  • a dial 11 is typically a multi-level body 12.
  • the body 12 includes in particular a circular recess 19 capable of forming a secondary display of the timepiece.
  • the upper face of the body 12 comprises one hour lap in the form of indexes 13 regularly spaced.
  • the secondary display comprises a second series of indexes 15 which borders on said circular shape.
  • the upper face comprises a decoration 17 intended to mask the shoulder between said upper face and the recess 19.
  • the manufacturing method 1 makes it possible to provide a new type of manufacturing which is particularly suitable for plastic parts 21 whose reliefs are very pronounced, that is to say greater than 40 ⁇ m.
  • the manufacturing method 1 comprises a first step 3 for manufacturing the main body 22 of the future plastic part 21 (a dial 21 in the example below).
  • step 3 is performed by injecting said plastic into a mold (not shown). Indeed, this type of manufacture allows the precise roughing of the raised portions of the dial 21.
  • the plastic material for producing the body 22 may be, for example, thermoplastic resins such as styrene such as acrylonitrile-butadiene-styrene (ABS), acrylic resins such as polymethylmethacrylate (PMMA) and mixtures such as PMMA / ABS, polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyamides, polycarbonates (PC), ABS / PC mixtures, an ethylene-vinyl acetate copolymer ( EVA), polyimides or fluorinated resins such as polytetrafluoroethylene (PTFE).
  • thermoplastic resins such as styrene such as acrylonitrile-butadiene-styrene (ABS), acrylic resins such as polymethylmethacrylate (PMMA) and mixtures such as PMMA / ABS
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • PC polycarbonates
  • step 5 of the method 1 the surface of the body 22 is structured to locally modify its surface state.
  • step 5 comprises two embodiments according to the adhesion characteristics of the plastic material used. Indeed according to the invention, the decorative layer will be applied directly to the body 22 of plastic.
  • step 5 is intended to locally increase the adhesion of the surface of the body 22 to the parts to be decorated, that is to say the elevations 24, 26 and 28.
  • the materials with very low adhesion are, for example, but not exclusively, polyolefins (PE ⁇ 70%, PP ⁇ 60%, etc.), saturated polyesters ( PET, PBT, etc.), polyamides (PA, etc.), fluorinated polymers (PTFE> 50%, etc.) or polyoxymethylenes (POM ⁇ 80%, etc.).
  • the structuring allowing the increase in adhesion comprises bosses 33 formed by making hollow 34 in the thickness of the piece to be decorated 11 which is not limited to a dial.
  • the height h 1 of the recesses 34 is small, that is to say between 2 and 10 ⁇ m and preferably about 5 ⁇ m
  • the width c 1 of the recesses 34 is between 5 and 20 ⁇ m and preferably about 10 ⁇ m
  • the width b 1 of the bosses 33 is between 5 and 20 ⁇ m and preferably about 10 ⁇ m. .mu.m.
  • the widths c 1 , b 1 respectively of the recesses 34 and the bosses 33 are substantially equal. This local structuring thus advantageously allows an increase in the selective adhesion of the surface to be coated during step 7.
  • step 5 is intended to reduce locally the adhesion of the surface of the body 22 at the level of the parts that are not to be decorated, that is to say all parts except the elevations 24, 26 and 28.
  • the materials with good adhesion are, for example, but not exclusively, polycarbonates (PC, etc.), styrenics (ABS, PS, etc.), polyacrylics ( PMMA, MABS, etc.), aromatic polysulfones (PSU, etc.), aromatic polyamides (PPA-semi-crystalline 25%, amorphous PPA, etc.) or polyaryletherketones (PEEK-semi-crystalline, etc.).
  • the structuring allowing the decrease in adhesion comprises bosses 35 formed by making recesses 36 in the thickness of the part to be decorated 11 which is not limited to a dial.
  • the height h 2 of the recesses 36 is large, that is to say between 50 and 200 ⁇ m and preferably about 100 ⁇ m
  • the width c 2 of the recesses 36 is between 5 and 20 ⁇ m. ⁇ m and preferably about 10 microns
  • the width b 2 of the bosses 35 is small, that is to say between 0.1 and 3 microns and preferably about 1 micron.
  • This local structuring allows advantageously a decrease in the selective adhesion of the surface to be coated during step 7.
  • Step 5 to selectively structure the surface condition of the body 22 may be destructively or non-destructively contemplated. Indeed, according to a non-destructive alternative, it can be envisaged that the surface condition is "manufactured" at the same time as the body 22 itself, adapting "in negative” the internal surface of the mold used during the step 3. It is then clear that steps 3 and 5 would then be performed at the same time.
  • step 5 for selectively structuring the surface state of the body 22 may also be performed in another alternative in a destructive manner, i.e., by removal of material.
  • the structuring of step 5 is performed by laser-type radiation which offers a very high precision for a modification of the surface state.
  • the body 22 may be demolded and then subjected to said radiation or, alternatively, the mold may comprise transparent parts to said radiation which allows to structure said body "in situ" that is to say without prior demolding.
  • step 7 for depositing on the entire body 22, a decorative layer 31 as illustrated in FIG. figure 6 .
  • step 7 is carried out by physical vapor deposition (PVD), however, other types of deposition may be envisaged, such as electroplating, chemical vapor deposition (CVD), atomic layer deposition (ALD) or even UV printing or lacquering.
  • PVD physical vapor deposition
  • CVD chemical vapor deposition
  • ALD atomic layer deposition
  • UV printing or lacquering even UV printing or lacquering.
  • the last step 9 consists only of ridding the parts of the deposited layer 31 which have not adhered to the body 22 of the part 21.
  • the decorative layer 31 remains, that is to say, adhere, only at the level of the indexes 23, 25 and decor 27 under the effect of step 9.
  • the latter 9 can, for example, be performed by polishing, pressurized air jet or wet scrubbing.
  • the decorative layer 31 comprises at least one metal material which allows the dial 21 to provide an appearance that can be shiny at its raised portions 23, 25 and 27.
  • metal material which allows the dial 21 to provide an appearance that can be shiny at its raised portions 23, 25 and 27.
  • other types of materials can be envisioned as, for example, metal oxides and / or metal nitrides.
  • the decorative layer 31 is electrically conductive, according to a variant, following step 9, it can be envisaged to electroplate the decorations 23, 25, 27 to thicken each portion comprising said decoration.
  • the method 1 uses less material to form the decorative layer 31 than for the usual processes shown in FIGS. Figures 1 and 2 .
  • the problem of positioning parts 23, 25 and 27 is limited to the quality of implementation of step 3.
  • the present invention is not limited to the illustrated example but is susceptible of various variations and modifications that will occur to those skilled in the art.
  • the body 22 may be made from a material other than a plastic material such as, for example, a composite material or a ceramic.
  • Step 3 can also be carried out by a method other than the injection into a mold presented above, such as, for example, calendering, thermoforming, compression molding, stamping and / or stamping. on press.
  • the flat surfaces of the dial 21, such as in particular the secondary display 29, can also be selectively covered with the decorative layer 31 to give an additional aesthetic effect. It suffices to provide a suitable structuring in step 5 so that said coated portions of the flat surfaces of the dial 21 remain after step 9.
  • the shapes of the recesses 34, 36 and / or bosses 33, 35 are not limited to the examples of the Figures 10 and 12 but may be, for example, round, elliptical, rectangular or more generally polygonal.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Laminated Bodies (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Description

Domaine de l'inventionField of the invention

L'invention se rapporte à un procédé de fabrication d'une pièce en relief décorée et, plus particulièrement, une telle pièce en plastique dont les décors ont un aspect métallique.The invention relates to a method of manufacturing a decorated relief piece and, more particularly, such a plastic piece whose decorations have a metallic appearance.

Arrière plan de l'inventionBackground of the invention

Un cadran de pièce d'horlogerie comporte habituellement des appliques permettant de le décorer. Ces appliques peuvent par exemple représenter un tour d'heure destiné à faciliter la détermination de l'heure par rapport à l'emplacement des aiguilles de la pièce d'horlogerie. Ces appliques peuvent également être utilisées pour plus simplement apporter un effet esthétique au cadran.A timepiece dial usually has sconces to decorate it. These appliques may for example represent a time lapse to facilitate the determination of the time relative to the location of the needles of the timepiece. These sconces can also be used to simply bring an aesthetic effect to the dial.

Habituellement, ces appliques sont montées sur le cadran par des étapes successives de collage puis éventuellement de masquage et/ou de tamponnage ce qui, en plus du prix des appliques, occasionne des surcoûts de fabrication dus à la précision de positionnement exigée qui est d'autant plus grande que l'applique est épaisse. De tels procédés sont décrits dans les documents US 2 642 390 , JP 6 000 4879 , et CH 344374 .Usually, these sconces are mounted on the dial by successive steps of gluing and possibly masking and / or buffering which, in addition to the price of the sconces, causes additional manufacturing costs due to the required positioning accuracy which is as much larger than the wall lamp is thick. Such methods are described in the documents US 2,642,390 , JP 6000 4879 , and CH 344374 .

Résumé de l'inventionSummary of the invention

Le but de la présente invention est de pallier tout ou partie les inconvénients cités précédemment en proposant plus généralement un procédé de fabrication d'une pièce décorée qui comporte moins d'étapes et consomme moins de matière pour réaliser les décors.The object of the present invention is to overcome all or part of the disadvantages mentioned above by more generally proposing a method of manufacturing a decorated part which has fewer steps and consumes less material to make the decorations.

A cet effet, l'invention se rapporte à un procédé de fabrication d'une pièce en relief, lesquels reliefs sont au moins partiellement revêtue d'une couche de décoration comportant l'étape suivante :

  1. a) former le corps de la pièce ;
    caractérisé en ce que le procédé comporte en outre les étapes suivantes :
  2. b) modifier sélectivement l'état de surface du corps de la pièce afin de localement changer son adhérence par rapport à ladite couche de décoration ;
  3. c) déposer directement sur tout le corps ladite couche de décoration ;
  4. d) débarrasser les parties de la couche déposée qui n'ont pas adhérées au corps de la pièce.
For this purpose, the invention relates to a method of manufacturing a raised piece, which reliefs are at least partially coated with a decorative layer comprising the following step:
  1. a) forming the body of the room;
    characterized in that the method further comprises the following steps:
  2. b) selectively modifying the surface condition of the body of the workpiece so as to locally change its adhesion with respect to said decorative layer;
  3. c) directly depositing on the whole body said decorative layer;
  4. d) rid the parts of the deposited layer that have not adhered to the body of the part.

Avantageusement selon l'invention, on comprend donc qu'il n'est plus nécessaire de déposer sélectivement les décors. La structuration préalable permet de sélectionner précisément les zones d'adhésion et/ou de non adhésion afin de simplifier l'étape de dépôt du ou des décor(s).Advantageously according to the invention, it is therefore understood that it is no longer necessary to selectively deposit the decorations. Prior structuring makes it possible to precisely select the zones of adhesion and / or non-adhesion in order to simplify the step of depositing the decor (s).

Conformément à d'autres caractéristiques avantageuses de l'invention :

  • l'étape b) est destinée à diminuer localement l'adhérence de la surface du corps afin que, lors de l'étape c), la couche déposée n'adhère pas sur les parties modifiées ;
  • la diminution d'adhérence est obtenue par la formation de bossages alternés avec des creux, la hauteur et la largeur des creux étant comprises respectivement entre 50 et 200 µm et 5 et 20 µm, et la largeur des bossages entre 0,1 et 3 µm ;
  • l'étape b) est destinée à augmenter localement l'adhérence de la surface du corps afin que, lors de l'étape c), la couche déposée adhère sur les parties modifiées ;
  • l'augmentation d'adhérence est obtenue par la formation de bossages alternés avec des creux, la hauteur et la largeur des creux étant comprises respectivement entre 2 et 10 µm et 5 et 20 µm, et la largeur des bossages entre 5 et 20 µm ;
  • les largeurs des creux et des bossages sont sensiblement égales ;
  • l'étape a) est réalisée par une injection de matière dans un moule ;
  • les étapes a) et b) sont réalisées en même temps en modifiant localement l'état de surface interne dudit moule ;
  • l'étape b) est réalisée par rayonnement du type laser ;
  • l'étape c) est réalisée par un dépôt physique en phase vapeur ;
  • la couche de décoration comporte au moins un matériau métallique ;
  • après l'étape d), une galvanoplastie est réalisée afin d'épaissir chaque partie comportant ladite couche de décoration ;
  • le corps de la pièce est réalisé à l'aide d'une matière plastique ;
  • la pièce en relief est un cadran de pièce d'horlogerie.
According to other advantageous features of the invention:
  • step b) is intended to locally reduce the adhesion of the surface of the body so that, in step c), the deposited layer does not adhere to the modified parts;
  • the reduction of adhesion is obtained by the formation of alternating bosses with recesses, the height and the width of the recesses being respectively between 50 and 200 μm and 5 and 20 μm, and the width of the bosses between 0.1 and 3 μm ;
  • step b) is intended to locally increase the adhesion of the body surface so that, in step c), the deposited layer adheres to the modified parts;
  • the adhesion increase is obtained by the formation of alternating bosses with depressions, the height and the width of the depressions being respectively between 2 and 10 microns and 5 and 20 microns, and the width of the bosses between 5 and 20 microns;
  • the widths of the recesses and bosses are substantially equal;
  • step a) is performed by injecting material into a mold;
  • steps a) and b) are performed at the same time by locally modifying the internal surface condition of said mold;
  • step b) is performed by laser type radiation;
  • step c) is carried out by a physical vapor deposition;
  • the decorative layer comprises at least one metallic material;
  • after step d), an electroplating is performed in order to thicken each portion comprising said decorative layer;
  • the body of the piece is made using a plastic material;
  • the relief piece is a timepiece dial.

Description sommaire des dessinsBrief description of the drawings

D'autres particularités et avantages ressortiront clairement de la description qui en est faite ci-après, à titre indicatif et nullement limitatif, en référence aux dessins annexés, dans lesquels :

  • la figure 1 est un cadran typique de pièce d'horlogerie vu de dessus ;
  • la figure 2 est une section schématique selon la coupe A-A de la figure 1 ;
  • les figures 3 à 7 sont des représentations d'étapes successives de deux modes de réalisation du procédé de fabrication selon l'invention ;
  • la figure 8 est un schéma fonctionnel du procédé de fabrication selon l'invention
  • la figure 9 est une représentation schématique vue de dessus d'un cadran selon l'invention ;
  • la figure 10 est une représentation agrandie d'une partie de la figure 9 selon un premier mode de réalisation ;
  • la figure 11 est une vue en coupe A-A de la figure 10 ;
  • la figure 12 est une représentation agrandie d'une partie de la figure 9 selon un deuxième mode de réalisation ;
  • la figure 13 est une vue en coupe B-B de la figure 12.
Other particularities and advantages will emerge clearly from the description which is given hereinafter, by way of indication and in no way limiting, with reference to the appended drawings, in which:
  • the figure 1 is a typical timepiece dial seen from above;
  • the figure 2 is a schematic section according to the AA section of the figure 1 ;
  • the Figures 3 to 7 are representations of successive steps of two embodiments of the manufacturing method according to the invention;
  • the figure 8 is a block diagram of the manufacturing process according to the invention
  • the figure 9 is a schematic representation seen from above of a dial according to the invention;
  • the figure 10 is an enlarged representation of some of the figure 9 according to a first embodiment;
  • the figure 11 is a sectional AA view of the figure 10 ;
  • the figure 12 is an enlarged representation of some of the figure 9 according to a second embodiment;
  • the figure 13 is a sectional view BB of the figure 12 .

Description détaillée des modes de réalisation préférésDetailed Description of the Preferred Embodiments

Les figures 1 et 2 représentent un cadran 11 typique pour une pièce d'horlogerie. Comme expliqué ci-dessus, le procédé 1 selon l'invention ne se limite pas à la fabrication d'un cadran mais à tout type de pièce plastique décorée en relief. Cependant, un cadran de pièce d'horlogerie est un bon exemple d'application du procédé 1 selon l'invention.The Figures 1 and 2 represent a typical dial 11 for a timepiece. As explained above, the method 1 according to the invention is not limited to the manufacture of a dial but to any type of plastic part decorated in relief. However, a timepiece dial is a good example of application of the method 1 according to the invention.

Comme visibles aux figures 1 et 2, un cadran 11 est typiquement un corps 12 à plusieurs niveaux. Dans l'exemple illustré à la figure 2, on peut voir que le corps 12 comporte notamment un évidemment circulaire 19 apte à former un affichage secondaire de la pièce d'horlogerie. On remarque également que la face supérieure du corps 12 comporte un tour d'heure sous forme d'index 13 régulièrement espacés. De la même manière, l'affichage secondaire comporte une deuxième série d'index 15 qui borde ladite forme circulaire. Enfin, la face supérieure comporte un décor 17 destiné à masquer l'épaulement entre ladite face supérieure et l'évidement 19.As visible to Figures 1 and 2 a dial 11 is typically a multi-level body 12. In the example shown in figure 2 it can be seen that the body 12 includes in particular a circular recess 19 capable of forming a secondary display of the timepiece. It is also noted that the upper face of the body 12 comprises one hour lap in the form of indexes 13 regularly spaced. In the same way, the secondary display comprises a second series of indexes 15 which borders on said circular shape. Finally, the upper face comprises a decoration 17 intended to mask the shoulder between said upper face and the recess 19.

Comme expliqué ci-dessus, pour réaliser un tel cadran 11, il est nécessaire de rapporter ces index 13, 15 et décor 17 par des étapes successives de collage puis éventuellement de masquage et/ou de tamponnage quand les reliefs sont très prononcés. Avantageusement selon l'invention, le procédé de fabrication 1 permet de fournir un nouveau type de fabrication qui est particulièrement adapté à des pièces plastiques 21 dont les reliefs sont très prononcés, c'est-à-dire supérieurs à 40 µm.As explained above, to make such a dial 11, it is necessary to report these indexes 13, 15 and 17 decoration by successive steps of bonding and possibly masking and / or buffering when the reliefs are very pronounced. Advantageously according to the invention, the manufacturing method 1 makes it possible to provide a new type of manufacturing which is particularly suitable for plastic parts 21 whose reliefs are very pronounced, that is to say greater than 40 μm.

Comme illustré à la figure 8, le procédé de fabrication 1 comporte une première étape 3 destinée à fabriquer le corps principal 22 de la future pièce plastique 21 (un cadran 21 dans l'exemple ci-dessous). De manière préférée, l'étape 3 est réalisée par injection de ladite matière plastique dans un moule (non représenté). En effet, ce type de fabrication autorise l'ébauche précise des parties en relief du cadran 21.As illustrated in figure 8 , the manufacturing method 1 comprises a first step 3 for manufacturing the main body 22 of the future plastic part 21 (a dial 21 in the example below). Preferably, step 3 is performed by injecting said plastic into a mold (not shown). Indeed, this type of manufacture allows the precise roughing of the raised portions of the dial 21.

Dans l'exemple illustré à la figure 3, on peut notamment distinguer les emplacements surélevés 24, 26 et 28 destinés à former respectivement les futurs index 23, 25 et décor 27. On distingue également la partie creusée 29 destinée à former l'affichage secondaire. On comprend donc qu'en une seule étape 3, les positionnements des différentes parties du cadran 21 sont réalisés très précisément. Selon l'invention, la matière plastique pour réaliser le corps 22 peut être, par exemple, des résines thermoplastiques telles que les styréniques comme l'acrylonitrile-butadiène-styrène (ABS), des résines acryliques comme le polyméthacrylate de méthyl (PMMA) et des mélanges comme le PMMA/ABS, des polyesters comme le polyéthylène téréphtalate (PET), le polybutylène téréphtalate (PBT), des polyamides, des polycarbonates (PC), des mélanges ABS/PC, un copolymère d'éthylène-acétate de vinyl (EVA), des polyimides ou des résines fluorées comme le polytétrafluoroéthylène (PTFE).In the example shown in figure 3 , it is possible to distinguish in particular the raised locations 24, 26 and 28 intended to form respectively the future indexes 23, 25 and decor 27. There is also the hollow part 29 intended to form the secondary display. So we understand that in a single step 3, the positioning of the different parts of the dial 21 are made very precisely. According to the invention, the plastic material for producing the body 22 may be, for example, thermoplastic resins such as styrene such as acrylonitrile-butadiene-styrene (ABS), acrylic resins such as polymethylmethacrylate (PMMA) and mixtures such as PMMA / ABS, polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyamides, polycarbonates (PC), ABS / PC mixtures, an ethylene-vinyl acetate copolymer ( EVA), polyimides or fluorinated resins such as polytetrafluoroethylene (PTFE).

Dans une deuxième étape 5 du procédé 1, la surface du corps 22 est structurée afin de modifier localement son état de surface. Selon l'invention, l'étape 5 comporte deux modes de réalisation selon les caractéristiques d'adhérence de la matière plastique utilisée. En effet selon l'invention, la couche de décoration sera appliquée directement sur le corps 22 en matière plastique.In a second step 5 of the method 1, the surface of the body 22 is structured to locally modify its surface state. According to the invention, step 5 comprises two embodiments according to the adhesion characteristics of the plastic material used. Indeed according to the invention, the decorative layer will be applied directly to the body 22 of plastic.

Ainsi, dans un premier mode de réalisation dans lequel le matériau plastique possède une très faible adhérence par rapport à la couche de décoration à déposer, l'étape 5, comme illustrée à la figure 4, est destinée à augmenter localement l'adhérence de la surface du corps 22 au niveau des parties à décorer, c'est-à-dire les surélévations 24, 26 et 28.Thus, in a first embodiment in which the plastic material has a very low adhesion with respect to the decorative layer to be deposited, step 5, as illustrated in FIG. figure 4 , is intended to locally increase the adhesion of the surface of the body 22 to the parts to be decorated, that is to say the elevations 24, 26 and 28.

Dans le premier mode de réalisation, les matériaux à très faible adhérence, dits « non mouillables », sont, par exemple, mais non exclusivement, des polyoléfines (PE∼70%, PP∼60%, etc.), des polyesters saturés (PET, PBT, etc.), des polyamides (PA, etc.), des polymères fluorés (PTFE>50%, etc.) ou des polyoxyméthylènes (POM∼80%, etc.).In the first embodiment, the materials with very low adhesion, called "non-wettable", are, for example, but not exclusively, polyolefins (PE~70%, PP~60%, etc.), saturated polyesters ( PET, PBT, etc.), polyamides (PA, etc.), fluorinated polymers (PTFE> 50%, etc.) or polyoxymethylenes (POM~80%, etc.).

Dans ce premier mode de réalisation visible aux figures 9 à 11, la structuration permettant l'augmentation d'adhérence comporte des bossages 33 formés par réalisation de creux 34 dans l'épaisseur de la pièce à décorer 11 qui n'est pas limité à un cadran. A titre d'exemple, la hauteur h1 des creux 34 est faible, c'est-à-dire comprise entre 2 et 10 µm et préférablement d'environ 5 µm, la largeur c1 des creux 34 est comprise entre 5 et 20 µm et préférablement d'environ 10 µm, et la largeur b1 des bossages 33 est comprise entre 5 et 20 µm et préférablement d'environ 10 µm.In this first embodiment visible to Figures 9 to 11 , the structuring allowing the increase in adhesion comprises bosses 33 formed by making hollow 34 in the thickness of the piece to be decorated 11 which is not limited to a dial. By way of example, the height h 1 of the recesses 34 is small, that is to say between 2 and 10 μm and preferably about 5 μm, the width c 1 of the recesses 34 is between 5 and 20 μm and preferably about 10 μm, and the width b 1 of the bosses 33 is between 5 and 20 μm and preferably about 10 μm. .mu.m.

Préférentiellement, les largeurs c1, b1 respectivement des creux 34 et des bossages 33 sont sensiblement égales. Cette structuration locale permet ainsi avantageusement une augmentation de l'adhérence sélective de la surface qui sera revêtue lors de l'étape 7.Preferably, the widths c 1 , b 1 respectively of the recesses 34 and the bosses 33 are substantially equal. This local structuring thus advantageously allows an increase in the selective adhesion of the surface to be coated during step 7.

A l'inverse, dans un deuxième mode de réalisation dans lequel le matériau plastique possède une bonne adhérence par rapport à la couche de décoration à déposer, l'étape 5, comme illustrée à la figure 5, est destinée à diminuer localement l'adhérence de la surface du corps 22 au niveau des parties qui ne sont pas à décorer, c'est-à-dire toutes les parties sauf les surélévations 24, 26 et 28.Conversely, in a second embodiment in which the plastic material has good adhesion with respect to the decorative layer to be deposited, step 5, as illustrated in FIG. figure 5 , is intended to reduce locally the adhesion of the surface of the body 22 at the level of the parts that are not to be decorated, that is to say all parts except the elevations 24, 26 and 28.

Dans le deuxième mode de réalisation, les matériaux à bonne adhérence, dits « mouillables », sont, par exemple, mais non exclusivement, des polycarbonates (PC, etc.), des styréniques (ABS, PS, etc.), des polyacryliques (PMMA, MABS, etc.), des polysulfones aromatiques (PSU, etc.), des polyamides aromatiques (PPA-semi cristallin 25%, PPA amorphe, etc.) ou des polyaryléthercétones (PEEK-semi cristallin, etc.).In the second embodiment, the materials with good adhesion, called "wettable", are, for example, but not exclusively, polycarbonates (PC, etc.), styrenics (ABS, PS, etc.), polyacrylics ( PMMA, MABS, etc.), aromatic polysulfones (PSU, etc.), aromatic polyamides (PPA-semi-crystalline 25%, amorphous PPA, etc.) or polyaryletherketones (PEEK-semi-crystalline, etc.).

Dans ce deuxième mode de réalisation visible aux figures 9, 12 et 13, la structuration permettant la diminution d'adhérence comporte des bossages 35 formés par réalisation de creux 36 dans l'épaisseur de la pièce à décorer 11 qui n'est pas limité à un cadran. A titre d'exemple, la hauteur h2 des creux 36 est grande, c'est-à-dire comprise entre 50 et 200 µm et préférablement d'environ 100 µm, la largeur c2 des creux 36 est comprise entre 5 et 20 µm et préférablement d'environ 10 µm, et la largeur b2 des bossages 35 est faible, c'est-à-dire comprise entre 0,1 et 3 µm et préférablement d'environ 1 µm. Cette structuration locale permet ainsi avantageusement une diminution de l'adhérence sélective de la surface qui sera revêtue lors de l'étape 7.In this second embodiment visible to Figures 9, 12 and 13 , the structuring allowing the decrease in adhesion comprises bosses 35 formed by making recesses 36 in the thickness of the part to be decorated 11 which is not limited to a dial. By way of example, the height h 2 of the recesses 36 is large, that is to say between 50 and 200 μm and preferably about 100 μm, the width c 2 of the recesses 36 is between 5 and 20 μm. μm and preferably about 10 microns, and the width b 2 of the bosses 35 is small, that is to say between 0.1 and 3 microns and preferably about 1 micron. This local structuring allows advantageously a decrease in the selective adhesion of the surface to be coated during step 7.

L'étape 5 pour structurer sélectivement l'état de surface du corps 22 peut être envisagée de manière destructive ou non. En effet, selon une alternative non destructive, il peut être envisagé que l'état de surface soit « fabriqué » en même temps que le corps 22 lui-même, en adaptant « en négatif » la surface interne du moule utilisé lors de l'étape 3. On comprend alors que les étapes 3 et 5 seraient alors réalisées en même temps.Step 5 to selectively structure the surface condition of the body 22 may be destructively or non-destructively contemplated. Indeed, according to a non-destructive alternative, it can be envisaged that the surface condition is "manufactured" at the same time as the body 22 itself, adapting "in negative" the internal surface of the mold used during the step 3. It is then clear that steps 3 and 5 would then be performed at the same time.

Cependant, l'étape 5 pour structurer sélectivement l'état de surface du corps 22 peut également être réalisée dans une autre alternative de manière destructive, c'est-à-dire par enlèvement de matière. De manière préférée, dans cette autre alternative, la structuration de l'étape 5 est réalisée par rayonnement du type laser qui offre une très grande précision pour une modification de l'état de surface. Ainsi, le corps 22 peut être démoulé puis soumis audit rayonnement ou, en variante, le moule peut comporter des parties transparentes aux dits rayonnements ce qui permet de structurer ledit corps « in situ » c'est-à-dire sans démoulage préalable.However, step 5 for selectively structuring the surface state of the body 22 may also be performed in another alternative in a destructive manner, i.e., by removal of material. Preferably, in this alternative, the structuring of step 5 is performed by laser-type radiation which offers a very high precision for a modification of the surface state. Thus, the body 22 may be demolded and then subjected to said radiation or, alternatively, the mold may comprise transparent parts to said radiation which allows to structure said body "in situ" that is to say without prior demolding.

A la suite d'un de ces deux modes de réalisation de l'étape 5, le procédé 1 continue avec une étape 7 destinée à déposer sur tout le corps 22, une couche de décoration 31 comme illustré à la figure 6. Préférentiellement, l'étape 7 est réalisée par dépôt physique en phase vapeur (PVD), cependant, d'autres types de dépôt sont envisageables comme la galvanoplastie, le dépôt chimique en phase vapeur (CVD), le dépôt par couche atomique (ALD) ou même une impression UV ou un laquage.Following one of these two embodiments of step 5, the method 1 continues with a step 7 for depositing on the entire body 22, a decorative layer 31 as illustrated in FIG. figure 6 . Preferably, step 7 is carried out by physical vapor deposition (PVD), however, other types of deposition may be envisaged, such as electroplating, chemical vapor deposition (CVD), atomic layer deposition (ALD) or even UV printing or lacquering.

Avantageusement selon l'invention, la dernière étape 9 consiste uniquement à débarrasser les parties de la couche déposée 31 qui n'ont pas adhérées au corps 22 de la pièce 21. En effet, grâce à la structuration selon l'un des modes de réalisation de l'étape 5, la couche de décoration 31 ne subsiste, c'est-à-dire n'adhère, qu'au niveau les index 23, 25 et décor 27 sous l'effet de l'étape 9. Cette dernière 9 peut, par exemple, être réalisée par polissage, par jet d'air sous pression ou par lavage en milieu humide.Advantageously according to the invention, the last step 9 consists only of ridding the parts of the deposited layer 31 which have not adhered to the body 22 of the part 21. Indeed, thanks to the structuring according to one of the embodiments of step 5, the decorative layer 31 remains, that is to say, adhere, only at the level of the indexes 23, 25 and decor 27 under the effect of step 9. The latter 9 can, for example, be performed by polishing, pressurized air jet or wet scrubbing.

De manière préférée, la couche de décoration 31 comporte au moins un matériau métallique ce qui permet au cadran 21 d'offrir un aspect qui peut être brillant au niveau de ses parties surélevées 23, 25 et 27. Cependant, d'autres types de matières sont envisageables comme, par exemple, des oxydes métalliques et/ou des nitrures métalliques.Preferably, the decorative layer 31 comprises at least one metal material which allows the dial 21 to provide an appearance that can be shiny at its raised portions 23, 25 and 27. However, other types of materials can be envisioned as, for example, metal oxides and / or metal nitrides.

Enfin, si la couche de décor 31 est électriquement conductrice, selon une variante, à la suite de l'étape 9, il peut être envisagé de réaliser une galvanoplastie des décors 23, 25, 27 afin d'épaissir chaque partie comportant ladite couche de décoration.Finally, if the decorative layer 31 is electrically conductive, according to a variant, following step 9, it can be envisaged to electroplate the decorations 23, 25, 27 to thicken each portion comprising said decoration.

A la lecture de l'invention ci-dessus, on comprend donc que le procédé 1 utilise moins de matière pour former la couche de décoration 31 que pour les procédés habituels représentés aux figures 1 et 2. De plus, le problème de positionnement des parties 23, 25 et 27 est circonscrit à la qualité de réalisation de l'étape 3.On reading the invention above, it is therefore understood that the method 1 uses less material to form the decorative layer 31 than for the usual processes shown in FIGS. Figures 1 and 2 . In addition, the problem of positioning parts 23, 25 and 27 is limited to the quality of implementation of step 3.

Bien entendu, la présente invention ne se limite pas à l'exemple illustré mais est susceptible de diverses variantes et modifications qui apparaîtront à l'homme de l'art. En particulier, le corps 22 peut être réalisé à partir d'une autre matière qu'une matière plastique comme, par exemple, un matériau composite ou une céramique. L'étape 3 peut également être réalisée par une autre que méthode que l'injection dans un moule présenté ci-dessus, comme, par exemple, le calandrage, le thermoformage, le moulage par compression, l'estampage et/ou l'emboutissage sur presse.Of course, the present invention is not limited to the illustrated example but is susceptible of various variations and modifications that will occur to those skilled in the art. In particular, the body 22 may be made from a material other than a plastic material such as, for example, a composite material or a ceramic. Step 3 can also be carried out by a method other than the injection into a mold presented above, such as, for example, calendering, thermoforming, compression molding, stamping and / or stamping. on press.

A la lecture de l'invention ci-dessus, on comprend également que les surfaces planes du cadran 21, comme notamment l'affichage secondaire 29, peuvent être également sélectivement recouverte de la couche de décoration 31 pour donner un effet esthétique supplémentaire. Il suffit de prévoir une structuration idoine lors de l'étape 5 afin que lesdites parties revêtues des surfaces planes du cadran 21 subsistent après de l'étape 9.On reading the invention above, it is also understood that the flat surfaces of the dial 21, such as in particular the secondary display 29, can also be selectively covered with the decorative layer 31 to give an additional aesthetic effect. It suffices to provide a suitable structuring in step 5 so that said coated portions of the flat surfaces of the dial 21 remain after step 9.

Enfin, les formes des creux 34, 36 et/ou des bossages 33, 35 ne sont pas limitées aux exemples des figures 10 et 12 mais peuvent être, par exemple, rondes, elliptiques, rectangulaires ou plus généralement polygonales.Finally, the shapes of the recesses 34, 36 and / or bosses 33, 35 are not limited to the examples of the Figures 10 and 12 but may be, for example, round, elliptical, rectangular or more generally polygonal.

Claims (14)

  1. Method for fabricating (1) a part (21) comprising reliefs, wherein said reliefs (23, 25, 27) are at least partially coated with a decorative layer (31) including the following step:
    a) forming (3) the body (22) of the part (21);
    c) directly depositing (7) said decorative layer over the entire body (22);
    d) removing (9) the portions of the deposited layer (31) which have not adhered to the body (22) of the part.
    characterized in that the method further includes between steps a) & c) the following step:
    b) selectively altering (5) the surface state of the body (22) of the part (21) in order to change the adherence properties thereof locally relative to said decorative layer;
  2. Method (1) according to claim 1, characterized in that step b) is for locally decreasing the adherence of the surface of the body (22) so that, in step c), the deposited layer (31) does not adhere to the altered portions.
  3. Method (1) according to claim 2, characterized in that the decreased adherence is obtained by forming bosses (35) alternating with hollows (36), the height (h2) and width (c2) of the hollows (36) being comprised respectively between 50 and 200 µm and 5 and 20 µm, and the width (b2) of the bosses (35) between 0.1 et 3 µm.
  4. Method (1) according to claim 1, characterized in that step b) is for locally increasing the adherence of the surface of the body (22) so that, in step c), the deposited layer (31) adheres to the altered portions.
  5. Method (1) according to claim 4, characterized in that the increased adherence is obtained by forming bosses (33) alternating with hollows (34), the height (h1) and the width (c1) of the hollows (34) being comprised respectively between 2 and 10 µm and 5 and 20 µm, and the width (b1) of the bosses (33) between 5 and 20 µm.
  6. Method (1) according to claim 5, characterized in that the widths (c1) of the hollows (34) and (b1) the bosses (33) are substantially equal.
  7. Method (1) according to any of the preceding claims, characterized in that step a) is achieved by injecting material into a mould.
  8. Method (1) according to claim 7, characterized in that steps a) and b) are performed at the same time by locally altering the internal surface state of said mould.
  9. Method (1) according to any of claims 1 to 7, characterized in that step b) is performed by locally altering the surface state by laser radiation.
  10. Method (1) according to any of the preceding claims, characterized in that step c) is performed by vapour phase deposition.
  11. Method (1) according to any of the preceding claims, characterized in that the decorative layer (31) includes at least one metallic material.
  12. Method (1) according to claim 11, characterized in that, after step d), galvanoplasty is performed in order to thicken each portion (23, 25, 27) including said decorative layer.
  13. Method (1) according to any of the preceding claims, characterized in that the body (22) of the part (21) is made using a plastic material.
  14. Method (1) according to any of the preceding claims, characterized in that the part (21) with relief is a timepiece dial.
EP10726115.8A 2009-07-06 2010-06-25 Method for manufacturing a decorated part with raised pattern Active EP2452231B1 (en)

Priority Applications (1)

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EP10726115.8A EP2452231B1 (en) 2009-07-06 2010-06-25 Method for manufacturing a decorated part with raised pattern

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EP09164688A EP2273324A1 (en) 2009-07-06 2009-07-06 Method for manufacturing a decorated part with raised pattern
PCT/EP2010/059085 WO2011003756A1 (en) 2009-07-06 2010-06-25 Method for manufacturing a decorated part with a raised pattern
EP10726115.8A EP2452231B1 (en) 2009-07-06 2010-06-25 Method for manufacturing a decorated part with raised pattern

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EP (2) EP2273324A1 (en)
JP (1) JP5584293B2 (en)
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JP6407146B2 (en) * 2012-07-06 2018-10-17 ロレックス・ソシエテ・アノニムＲｏｌｅｘ Ｓａ Method for treating surface of timepiece component and timepiece component obtained by the method
US9886004B2 (en) * 2013-04-24 2018-02-06 Eta Sa Manufacturing Horlogere Suisse Method and device for assembling a movement to a watch case
JP6927268B2 (en) * 2015-06-24 2021-08-25 カシオ計算機株式会社 Decorative parts, dials, and watches
WO2019120933A1 (en) 2017-12-20 2019-06-27 Eta Sa Manufacture Horlogère Suisse Process for manufacturing a dial comprising at least one three-dimensional element
JP2018124282A (en) * 2018-02-20 2018-08-09 カシオ計算機株式会社 Decoration member manufacturing method, decoration member, and timepiece
EP3547042A1 (en) * 2018-03-29 2019-10-02 ETA SA Manufacture Horlogère Suisse Method and system for producing at least one timepiece element intended for being attached to a timepiece component of a timepiece
EP3623877A1 (en) * 2018-09-17 2020-03-18 Rolex Sa Method for manufacturing a clock component
CN112445119A (en) * 2019-08-27 2021-03-05 广州市恒上钟表配件有限公司 Watch dial embossing processing technology

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WO2011003756A1 (en) 2011-01-13
CN102483607A (en) 2012-05-30
CN102483607B (en) 2015-01-21
US20120100305A1 (en) 2012-04-26
JP5584293B2 (en) 2014-09-03
JP2012532328A (en) 2012-12-13
EP2273324A1 (en) 2011-01-12
US9050626B2 (en) 2015-06-09
HK1171524A1 (en) 2013-03-28
EP2452231A1 (en) 2012-05-16

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