JP5195165B2 - Manufacturing method of timepiece dial, timepiece dial and timepiece - Google Patents

Description

  The present invention relates to a timepiece dial manufacturing method, a timepiece dial, and a timepiece.

In general, a timepiece dial uses characters and numerals (so-called time characters, etc.), scales, symbols, and various marks having functions such as indicating time.
As a method for forming such an index, a printing method is widely used.
However, the index formed by the conventional printing method has a problem that it is inferior to a high-class feeling. In particular, when a composition in which metal powder or the like is dispersed is used, the dispersion state of the metal powder is changed, and in the formed index portion, the metal powder is not uniformly dispersed (present in mottle), and There is a problem that so-called bleeding or sagging is likely to occur, and the aesthetic appearance of the obtained timepiece dial is particularly inferior.

  On the other hand, a method of attaching and fixing a planting material called “typesetting” is employed particularly in high-class timepieces (see, for example, Patent Document 1). However, in such a method, the planting material must be fixed (typesetting) to the substrate manually one by one, leading to an increase in processes and costs. Moreover, in the timepiece dial manufactured by attaching and fixing the planting material, when a relatively large external force (impact force) or the like is applied, the planting material may be detached from the dial body (substrate). there were. In addition, the planting material used in such a method generally has a foot for planting the dial body, but the foot is thinner than other parts. For this reason, when a comparatively large external force or the like is applied, there is a problem that the foot part breaks. The above problems tend to occur more easily as the height of the planting material is higher.

Japanese Patent Laid-Open No. 2003-247096

  An object of the present invention is to provide a timepiece dial having a glossy and excellent appearance and excellent durability, and to provide a manufacturing method capable of producing the timepiece dial. An object of the present invention is to provide a timepiece having the timepiece dial.

Such an object is achieved by the present invention described below.
The method for producing a timepiece dial of the present invention includes a composition application step of applying a composition containing a powder and a curable resin on a substrate by screen printing,
A resin curing step of curing the curable resin and forming a cured portion,
As the powder, a powder having an average particle diameter of 100 to 155 μm and provided with a metal film made of a metal material on both sides of a plastic base ,
As the composition, one having a viscosity of 8000 to 20000 cps at 25 ° C. is used.
In the screen printing, as a screen plate, at least the surface is provided with a wire composed of polytetrafluoroethylene, the mesh roughness is 20 to 120, and the diameter of the wire is 50 to 120 μm It is characterized by using .
Thereby, it is possible to provide a timepiece dial manufacturing method capable of manufacturing a timepiece dial having an excellent glossy appearance and excellent durability.

In the timepiece dial manufacturing method of the present invention, the composition preferably contains one or more selected from the group consisting of cyclohexane, isophorone and ethylene glycol monobutyl ether.
As a result, the powder can be more stably dispersed in the composition, and the fluidity of the powder in the composition is particularly excellent. As a result, the aesthetic appearance of the manufactured timepiece dial can be made particularly excellent.

In the timepiece dial manufacturing method of the present invention, the average thickness of the powder is preferably 10 to 30 μm.
Thereby, the aesthetic appearance of the timepiece dial can be made particularly excellent while the productivity of the timepiece dial is particularly excellent.
In the method for manufacturing a timepiece dial of the present invention, it is preferable that the base portion is made of a polyester resin.
Thereby, the aesthetic appearance of the timepiece dial can be made particularly excellent while the productivity of the timepiece dial is particularly excellent.
In the timepiece dial manufacturing method of the present invention, it is preferable that an average thickness of the metal film is 0.01 to 3.0 μm.
Thereby, the aesthetic appearance of the timepiece dial can be made particularly excellent while the productivity of the timepiece dial is particularly excellent.

In the method for manufacturing a timepiece dial of the present invention, the curable resin is preferably a photocurable resin.
Thereby, the productivity of the timepiece dial can be made particularly excellent. In addition, it is possible to more reliably prevent deterioration of the constituent material of the timepiece dial during manufacture, and the reliability of the manufactured timepiece dial can be made particularly excellent.

In the timepiece dial manufacturing method of the present invention, the curable resin preferably includes one or more selected from the group consisting of urethane resin, epoxy resin, and acrylic resin.
Thereby, the fluidity | liquidity in the composition of a powder can be improved, it will become what a powder tends to elastically deform and it will pass easily through the mesh of a screen plate. As a result, the aesthetic appearance of the manufactured timepiece dial can be made particularly excellent.

The timepiece dial of the present invention is manufactured using the method of the present invention.
As a result, it is possible to provide a timepiece dial having a glossy and excellent appearance and excellent durability.
The timepiece of the present invention includes the timepiece dial of the present invention.
As a result, it is possible to provide a timepiece having a timepiece dial having a glossy and excellent appearance and excellent durability. In addition, since the timepiece dial has a great influence on the appearance of the entire timepiece, the timepiece having the timepiece dial as described above has an excellent aesthetic appearance as a whole.

  According to the present invention, it is possible to provide a timepiece dial having a glossy appearance and excellent durability, and a timepiece dial capable of producing the timepiece dial with high productivity. A manufacturing method can be provided, and a timepiece including the timepiece dial can be provided.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. Note that the drawings referred to in this specification show part of the configuration in an emphasized manner, and do not accurately reflect actual dimensions and the like.
<Manufacturing method of timepiece dial>
First, the manufacturing method of this invention is demonstrated.
FIG. 1 is a sectional view showing a preferred embodiment of the timepiece dial manufacturing method of the present invention, and FIG. 2 is a plan view showing the preferred embodiment of the timepiece dial of the present invention.
The manufacturing method of this embodiment provides a substrate preparation step (1a) for preparing a substrate (dial plate body) 2 and a composition containing powder 31 and a curable resin in a predetermined pattern on the surface of the substrate 2. A composition applying step (1b) and a resin curing step (1c) for curing the curable resin to form a cured portion 32 and forming the index 3.

[Board preparation process]
First, a substrate (a dial body) 2 is prepared (1a).
The substrate 2 is a main part of the timepiece dial 1 and has a function of holding an index 3 described later.
The substrate 2 may be made of any material.

As a constituent material of the substrate 2, for example, various metal materials, various non-metal materials, and the like can be used.
When the board | substrate 2 is comprised by the metal material, the timepiece dial 1 which has the especially outstanding intensity | strength characteristic can be provided. Moreover, when the board | substrate 2 is comprised with a metal material, the board | substrate (dial board main body) 2 itself will have the outstanding glossiness, and shall make the aesthetic appearance as the timepiece dial plate 1 whole especially excellent. it can.
When the board | substrate 2 is comprised with a nonmetallic material, the dial 1 for timepieces which are generally comparatively lightweight and easy to carry can be provided, for example. Moreover, when the board | substrate 2 is comprised with a nonmetallic material, it can shape | mold to a desired shape comparatively easily, for example.

Examples of the metal material constituting the substrate 2 include Fe, Cu, Zn, Ni, Mg, Cr, Mn, Mo, Nb, Al, V, Zr, Sn, Au, Pd, Pt, Ag, and the like. Examples include alloys containing at least one kind (for example, bronze, brass, and white).
Moreover, as a nonmetallic material which comprises the board | substrate 2, ceramics, a plastics (especially heat resistant plastic), a stone material, wood, etc. are mentioned, for example.

As ceramics, for example, Al ₂ O ₃ , SiO ₂ , TiO ₂ , Ti ₂ O ₃ , ZrO ₂ , Y ₂ O ₃ , oxide-based ceramics such as barium titanate and strontium titanate, AlN, Si ₃ N ₄ , SiN, TiN, BN, ZrN, HfN, VN, TaN, NbN, CrN, Cr ₂ N, and other nitride ceramics, graphite, SiC, ZrC, Al ₄ C ₃ , CaC ₂ , WC, TiC, HfC, VC , Carbide ceramics such as TaC and NbC, boride ceramics such as ZrB ₂ and MoB, or composite ceramics in which two or more of these are arbitrarily combined.
When the substrate 2 is made of the above ceramics, the timepiece dial 1 having particularly excellent strength and hardness can be obtained.

  Moreover, as a plastic material which comprises the board | substrate 2, various thermoplastic resins and various thermosetting resins are mentioned, for example, polyethylene, a polypropylene, an ethylene-propylene copolymer, an ethylene-vinyl acetate copolymer (EVA) etc. Polyolefin, cyclic polyolefin, modified polyolefin, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyamide (eg, nylon 6, nylon 46, nylon 66, nylon 610, nylon 612, nylon 11, nylon 12, nylon 6-12, nylon 6-66), polyimide, polyamideimide, polycarbonate (PC), poly- (4-methylpentene-1), ionomer, acrylic resin, polymethyl methacrylate, acrylonitrile-butadiene-styrene copolymer (ABS tree) ), Acrylonitrile-styrene copolymer (AS resin), butadiene-styrene copolymer, polyoxymethylene, polyvinyl alcohol (PVA), ethylene-vinyl alcohol copolymer (EVOH), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyester such as polycyclohexane terephthalate (PCT), polyether, polyether ketone (PEK), polyether ether ketone (PEEK), polyether imide, polyacetal (POM), polyphenylene oxide, modified polyphenylene oxide, polysulfone, Polyethersulfone, polyphenylene sulfide, polyarylate, aromatic polyester (liquid crystal polymer), polytetrafluoroethylene, polyvinylidene fluoride , Other fluororesins, styrene, polyolefin, polyvinyl chloride, polyurethane, polyester, polyamide, polybutadiene, transpolyisoprene, fluororubber, chlorinated polyethylene, and other thermoplastic elastomers, Epoxy resin, phenol resin, urea resin, melamine resin, unsaturated polyester, silicone resin, urethane resin, poly-para-xylylene, poly-monochloro-para-xylylene , Poly-dichloro-para-xylylene, poly-monofluoro-para-xylylene, poly-monoethyl-para-xylylene, etc. Paraxylylene resin, etc., or copolymers, blends, polymer polymers mainly containing these Lee, and the like, singly or in combination of two or more of these (e.g., a blend resin, polymer alloy, as a laminate or the like) can be used.

The substrate 2 may have a substantially uniform composition at each site, or may have a different composition depending on the site. For example, the substrate 2 may have a base portion and a coat layer provided on the base portion.
The shape and size of the substrate 2 are not particularly limited, and are usually determined based on the shape and size of the timepiece dial 1. In the illustrated configuration, the substrate (dial plate main body) 2 has a flat plate shape, but may have a curved plate shape, for example.

Although the average thickness of the board | substrate 2 is not specifically limited, It is preferable that it is 200-700 micrometers, and it is more preferable that it is 300-600 micrometers.
The substrate 2 may be formed by any method such as compression molding or injection molding. The surface of the substrate 2 may be subjected to surface processing such as mirror surface processing, streak processing, and satin processing. Thereby, it becomes possible to give variations to the texture of the timepiece dial 1 to be obtained, and the aesthetic appearance of the timepiece dial 1 can be further improved.

In addition, the substrate 2 may have been subjected to lyophilic treatment or lyophobic treatment on a part of its surface. More specifically, a lyophilic treatment is applied to a site on which the composition on the substrate 2 is to be applied (site where the index 3 is to be formed), or a site on which the composition is to be applied on the substrate 2 (the index 3 is formed). A part other than the part to be treated may be subjected to liquid repellent treatment. Thereby, in the composition provision process mentioned in full detail later, a composition can be selectively provided to the desired site | part on the board | substrate 2 easily and reliably. As a result, the desired shape and pattern index 3 can be more reliably formed on the timepiece dial 1. Further, by applying a liquid repellency treatment to the portion of the substrate 2 to which the composition is not applied, it is possible to prevent dirt and the like from adhering to the obtained timepiece dial 1. The reliability can be made particularly excellent.
In addition, various cleaning processes may be performed on the surface of the substrate 2 prior to a process described later. Thereby, for example, the adhesion between the substrate 2 and the composition (index 3) can be made particularly excellent.

[Composition applying step]
Next, a fluid composition is applied to the surface of the substrate 2 in a predetermined pattern by screen printing (1b). That is, on the surface of the substrate 2, a region to which the composition is applied and a region to which the composition is not applied are mixed. The pattern to which the composition is applied is determined according to the shape / pattern of the index 3 to be formed.

By using the screen printing method, the composition can be repeatedly applied to the plurality of substrates 2 in a predetermined pattern while preventing variation between individuals. Therefore, it can be suitably applied to mass production of the timepiece dial 1 having excellent quality stability.
Screen printing is to press the upper surface of the screen plate 8 (the surface on which the composition is disposed) with the squeegee 9 in a state where the composition is disposed on the screen plate 8 having the mesh 81 constituted by the wires 811. To do.

In this step, the composition applied onto the substrate 2 includes the powder 31 and a curable resin.
The powder 31 is obtained by providing a metal film 312 on both surfaces of a plastic base 311. The present invention is characterized in that a composition having such a powder 31 is printed by a screen printing method.

Generally, when a composition having a metal powder is printed by screen printing, the metal powder is likely to be clogged in the screen plate mesh. For this reason, the dispersion | variation in the content rate of the metal powder in the composition provided on a board | substrate has become large. In addition, as a result of clogging of the mesh, there is a problem that an index to be formed cannot be formed accurately.
Therefore, in order to solve the above problem, in the present invention, the powder 31 having the above-described configuration is used as the powder of the composition.

  Since the base 311 of the powder 31 is made of plastic, the powder 31 can be suitably elastically deformed when the composition passes through the mesh 81 of the screen plate 8, and clogging is caused by the mesh 81 of the screen plate 8. It is certainly prevented from occurring. Further, the powder 31 can quickly recover its shape after passing through the mesh, and can be arranged along the surface shape of the composition patterned on the substrate.

  Further, the curable resin and the metal film 312 in the composition have low affinity. For this reason, the powder 31 covered with the metal film 312 is easy to flow in a composition containing a curable resin and is easily elastically deformed. In addition, since the powder 31 has the metal films 312 on both surfaces of the base portion 311, the powder 31 once elastically deformed is prevented from being warped when returning to its original shape. Further, since the powder 31 has the metal films 312 on both surfaces of the base 311, the thermal expansion coefficient of the constituent material of the base 311 and the thermal expansion coefficient of the constituent material of the metal film 312 are obtained in the manufacturing process of the timepiece dial 1. Due to the difference, warping of the powder 31 can be reliably prevented. As a result, the aesthetic appearance of the manufactured timepiece dial 1 can be reliably improved. Further, even when the temperature of the timepiece dial 1 manufactured by the method of the present invention is changed, the powder 31 is reliably prevented from being deformed. As a result, in the timepiece dial 1, due to a temperature change, the adhesion between the powder 31 and the cured portion 32 formed of the curable resin may decrease, or the adhesion between the substrate 2 and the index 3 may decrease. This is surely prevented, and the durability and reliability of the timepiece dial 1 can be made particularly excellent.

  From the above, these effects act synergistically, and when the composition passes through the mesh 81 of the screen plate 8, the powder 31 can be suitably elastically deformed, and the mesh 81 of the screen plate 8 can be easily deformed. And it can pass reliably. Further, the powder 31 that has passed through the mesh 81 can easily return to its original flat shape. As a result, it is possible to suppress variation in the content of the powder 31 at each part of the composition applied to the substrate 2 (composition patterned to correspond to the index 3 to be formed). Therefore, it is possible to improve the aesthetic appearance of the timepiece dial 1 obtained while improving the productivity of the timepiece dial 1.

  On the other hand, when the powder provided with the metal film only on one surface of the plastic base is used, the above-described effects cannot be obtained. That is, in the case of such a powder, since the affinity between the curable resin and the powder is increased, the fluidity of the powder is not sufficient and the elastic deformation is difficult. In addition, the powder that is once elastically deformed when passing through the mesh is easily maintained in a warped state. Further, in the manufacturing process of the timepiece dial 1, the powder 31 is likely to warp due to the difference between the thermal expansion coefficient of the constituent material of the base 311 and the thermal expansion coefficient of the constituent material of the metal film 312. As a result, the timepiece dial obtained does not have an excellent aesthetic appearance.

  Examples of the plastic material constituting the base 311 include various thermoplastic resins and various thermosetting resins, such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer (EVA), and the like. Polyolefin, cyclic polyolefin, modified polyolefin, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyamide (eg, nylon 6, nylon 46, nylon 66, nylon 610, nylon 612, nylon 11, nylon 12, nylon 6-12, nylon 6-66), polyimide, polyamideimide, polycarbonate (PC), poly- (4-methylpentene-1), ionomer, acrylic resin, polymethyl methacrylate, acrylonitrile-butadiene-styrene copolymer (A S resin), acrylonitrile-styrene copolymer (AS resin), butadiene-styrene copolymer, polyoxymethylene, polyvinyl alcohol (PVA), ethylene-vinyl alcohol copolymer (EVOH), polyethylene terephthalate (PET), poly Polyester such as butylene terephthalate (PBT) and polycyclohexane terephthalate (PCT), polyether, polyether ketone (PEK), polyether ether ketone (PEEK), polyether imide, polyacetal (POM), polyphenylene oxide, modified polyphenylene oxide, Polysulfone, polyethersulfone, polyphenylene sulfide, polyarylate, aromatic polyester (liquid crystal polymer), polytetrafluoroethylene, polyfluoride Nitriden, other fluororesins, styrene, polyolefin, polyvinyl chloride, polyurethane, polyester, polyamide, polybutadiene, trans polyisoprene, fluoro rubber, chlorinated polyethylene, and other thermoplastic elastomers, Epoxy resin, phenol resin, urea resin, melamine resin, unsaturated polyester, silicone resin, urethane resin, poly-para-xylylene, poly-monochloro-para-xylylene , Poly-dichloro-para-xylylene, poly-monofluoro-para-xylylene, poly-monoethyl-para-xylylene, etc. Paraxylylene resin, etc., or copolymers, blends, poly -Alloys can be used, and one or more of these can be used in combination (for example, as a blend resin, polymer alloy, laminate, etc.), but the base 311 is composed of a polyester resin. Is preferred. Thereby, when the composition passes through the mesh 81 of the screen plate 8, the powder 31 can be suitably elastically deformed, and the clogging of the mesh 81 of the screen plate 8 is more reliably prevented. And the powder 31 can be easily and reliably passed through the mesh 81 of the screen plate 8 and is applied onto the substrate 2 (a composition patterned so as to correspond to the index 3 to be formed). The variation in the content of the powder 31 at each part can be suppressed. Therefore, the productivity of the timepiece dial 1 can be made particularly excellent, and the aesthetic appearance of the obtained timepiece dial 1 can be made particularly excellent.

  The average thickness of the base 311 is preferably 7 to 29.9 μm, and more preferably 10 to 27.8 μm. When the average thickness of the base 311 is a value within the above range, when the composition passes through the mesh 81, the powder 31 can be suitably elastically deformed. The powder 31 can be arranged so as to follow the surface shape of the indicator 3 to be formed. Thereby, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent while the productivity of the timepiece dial 1 is made particularly excellent.

  Examples of the metal material constituting the metal film 312 include Fe, Cu, Zn, Ni, Mg, Cr, Mn, Mo, Nb, Al, V, Zr, Sn, Au, Pd, Pt, Ag, and the like. Among them, an alloy containing at least one kind (for example, bronze, brass, white or the like) can be mentioned, among which Cu, Al, Au, Pt, and Ag are preferable. Thereby, the aesthetic appearance of the timepiece dial 1 to be manufactured can be made particularly excellent.

  The average thickness of the metal film 312 is preferably 0.01 to 3.0 μm, and more preferably 0.02 to 2.0 μm. When the average thickness of the metal film 312 is within the above range, the metal material constituting the metal film 312 in the powder 31 while effectively preventing the thickness of the base 311 from becoming relatively thin. The texture of can be fully demonstrated. Thereby, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent while the productivity of the timepiece dial 1 is made particularly excellent.

  Further, it is preferable that the two metal films 312 on both surfaces of the base 311 have substantially the same average thickness. Specifically, the average thickness of the other metal film 312 with respect to the average thickness of the one metal film 312 in the powder 31 is preferably 3:10 to 10: 3, and is 5:10 to 10: 5. More preferably, it is more preferably 8:10 to 10: 8. Thus, the elastically deformed powder 31 is more reliably prevented from being warped when returning to its original shape. Further, since the powder 31 has the metal films 312 on both surfaces of the base 311, the thermal expansion coefficient of the constituent material of the base 311 and the thermal expansion coefficient of the constituent material of the metal film 312 are obtained in the manufacturing process of the timepiece dial 1. Due to the difference, it is possible to more reliably prevent the powder 31 from warping.

  The powder 31 as described above is preferably produced as follows. That is, the powder 31 is formed on a plastic layer (sheet having a thickness corresponding to the thickness of the base 311) by a vapor phase film formation method such as vacuum deposition, sputtering, or ion plating. A metal layer corresponding to the thickness of the film 312 is formed, and then cut into a predetermined size (a size corresponding to the average particle diameter of the powder 31). Thereby, it is possible to easily and surely obtain the powder 31 that has excellent adhesion between the base portion 311 and the metal film 312, has an aesthetic appearance, and can be suitably elastically deformed.

  Moreover, it is preferable that the average particle diameter of the powder 31 is 100-155 micrometers, it is more preferable that it is 108-147 micrometers, and it is further more preferable that it is 113-141 micrometers. As a result, the powder 31 can be suitably elastically deformed when passing through the mesh 81 of the screen plate 8 described later in detail, and after passing through the mesh 81, its shape is quickly restored. Therefore, in the composition applied (patterned) on the substrate 2, the powder 31 has the surface shape of the composition patterned on the substrate 2 in the direction of the main surface (surface direction) of the metal film 312. It will be arranged along. As a result, in the timepiece dial 1 to be manufactured, the powder 31 can reflect light effectively like diamond or cut glass, and the aesthetic appearance of the timepiece dial 1 is excellent. be able to. On the other hand, if the average particle size of the powder 31 is too small, depending on the material of the metal film 312, the gloss that is brilliant in appearance may be reduced. If the average particle size of the powder 31 is too large, it becomes difficult for the powder 31 to pass through the screen plate mesh, and clogging of the powder 31 into the mesh is likely to occur.

It is conceivable that the average particle diameter of the powder is larger than the above upper limit value, and that the roughness of the mesh is also roughened. In such a case, the elastic deformation of the powder becomes difficult, and the powder mesh becomes difficult. Clogging may easily occur, or the powder may be plastically deformed when passing through the mesh.
In the present invention, the particle size of the powder refers to the value of the diameter of a perfect circle having the same perimeter as the perimeter when the powder is viewed in plan. More specifically, when the shape of the powder in plan view is a square having a side of a [μm], the particle size of the glossy powder is 4a / π [μm].

The shape of the powder 31 in plan view is not particularly limited, but is preferably substantially square.
The average thickness of the powder 31 is preferably 10 to 30 μm, and more preferably 12 to 28 μm. When the average thickness of the powder 31 is a value within the above range, the powder 31 can be more preferably elastically deformed when passing through the mesh 81 of the screen plate 8, and after passing through the mesh 81, Its shape is restored more quickly. As a result, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent while the productivity of the timepiece dial 1 is particularly excellent.

  Further, the ratio of the average particle diameter of the powder 31 to the average thickness of the powder 31 is preferably 1 to 20, more preferably 1 to 15, and further preferably 3 to 11. Thereby, the powder 31 can be elastically deformed more suitably, and the powder 31 is a surface of the composition in which the direction of the main surface (surface direction) of the metal film 312 is more reliably patterned on the substrate 2. Arrangement along the shape.

The curable resin is in an uncured or semi-cured state.
As the curable resin, a resin material that is cured by energy rays (for example, heat (heat rays), light (including light other than visible light such as ultraviolet rays), electron beams) can be used. Photocurable resin, electron beam curable resin, and the like. More specifically, for example, phenol resin, epoxy resin, melamine resin, urea resin, unsaturated polyester resin, alkyd resin, urethane resin (polyurethane) ), Various curable resins such as acrylic resins can be used.

When a photocurable resin is used as the curable resin, the productivity of the timepiece dial 1 can be made particularly excellent. Further, deterioration of the constituent material of the timepiece dial 1 at the time of manufacture can be prevented more reliably, and the reliability of the manufactured timepiece dial 1 can be made particularly excellent.
Moreover, when 1 type, or 2 or more types selected from the group which consists of urethane resin, an epoxy resin, and an acrylic resin are used as curable resin, the fluidity | liquidity in the composition of the powder 31 can be improved, and powder 31 However, it becomes easy to elastically deform as described above and easily passes through the mesh 81.

The composition may contain components other than the powder 31 and the curable resin described above. Examples of such components include various solvents (functioning as a dispersion medium for dispersing the powder 31), a dispersant, a thermoplastic resin, and the like.
Although it does not specifically limit as a solvent, For example, using various solvents, such as a cyclohexane, n-hexane, n-pentane, ethanol, isopropanol, n-butanol, isophorone, ethylene glycol monobutyl ether, using 1 type or in combination of 2 or more types. Can do. Among these, when one or more selected from the group consisting of cyclohexane, isophorone and ethylene glycol monobutyl ether is used as the solvent, the powder 31 can be more stably dispersed in the composition. The fluidity of the powder 31 in the composition is particularly excellent.

  Moreover, the viscosity at 25 ° C. of the composition containing the powder 31 and the curable resin is preferably 8000 to 20000 cps, more preferably 12000 to 19000 cps, and further preferably 15000 to 18000 cps. When the viscosity of the composition is a value within the above range, the composition containing the relatively large powder 31 (relatively large powder 31 with respect to the mesh roughness of the screen plate 8) as described above is used as the screen mesh. When passing through 81, the powder 31 can be suitably elastically deformed, and the mesh 81 can be prevented from being clogged or the dispersion state of the powder 31 in the composition from being deteriorated. On the other hand, when the viscosity of the composition is too small, it is difficult to elastically deform the powder 31 and clogging of the powder into the mesh is likely to occur. Moreover, when the viscosity of the composition is too large, the efficiency (workability) of screen printing is reduced, and the elastic deformation of the powder and the restoration of the shape after passing through the mesh are less likely to occur.

In this step, the screen plate 8 is provided with a mesh 81 composed of wires 811, and a portion of the mesh 81 is closed with a plate film 82. Thereby, in the area | region which is not obstruct | occluded by the plate film 82 among the meshes 81, it is comprised so that a composition may be selectively supplied on the board | substrate 2 from the clearance gap between the wires 811.
The screen plate 8 used in this step preferably includes a wire 811 at least near the surface made of polytetrafluoroethylene. Thereby, the composition can be suitably passed through the mesh of the screen plate, and the target pattern index can be reliably formed. In particular, in the present invention, since the composition to be subjected to screen printing contains the powder 31, it tends to have a high viscosity. However, when such a screen plate 8 is passed through the mesh, Since the flow resistance of the composition can be reduced, printing can be performed stably. Further, the composition can be sufficiently wrapped around the back surface of the wire, and a target pattern can be formed.
As described above, it is preferable that the screen plate 8 used in this step includes the wire 811 having at least the vicinity of the surface made of polytetrafluoroethylene, but the entire wire 811 is made of polytetrafluoroethylene. More preferably, it is constituted by Thereby, the effects as described above are more remarkably exhibited.

  The screen plate 8 has a mesh roughness of preferably 20 to 120, more preferably 30 to 100, and even more preferably 50 to 70. If the mesh roughness is too small (the number is too large), depending on the average particle size of the powder, it becomes difficult for the powder 31 to pass through the mesh 81 of the screen plate 8, and clogging of the powder mesh 81 occurs. It may be easy to do. On the other hand, if the mesh roughness is too large (the number is too small), the elastic deformation as described above is hardly caused, and in the manufactured timepiece dial, the powder arrangement tends to be irregular, and as a result The aesthetic appearance of the timepiece dial may not be excellent.

Moreover, it is preferable that the diameter of the wire 811 which comprises the screen plate 8 is 50-120 micrometers, it is more preferable that it is 50-90 micrometers, and it is further more preferable that it is 60-70 micrometers. If the diameter of the wire constituting the screen plate (mesh) is too small, the strength of the screen plate may be lowered depending on the material of the wire, and it may be difficult to perform stable printing. On the other hand, if the diameter of the wire is too large, depending on the viscosity of the composition, the composition cannot be sufficiently wrapped around the back of the wire, and it may be difficult to accurately form the target pattern. is there.
As a constituent material of the squeegee 9, for example, urethane rubber, silicone rubber, various synthetic rubbers, various metals and the like can be used, and among them, urethane rubber is preferable.

[Resin curing process]
Next, the curable resin is cured to form a cured portion 32 (1c). Thereby, the indicator 3 is formed, and the timepiece dial 1 is obtained. The timepiece dial 1 obtained in this way is provided with the indicator 3 that exhibits a glossy and excellent appearance, and the aesthetic appearance (luxury feeling) of the timepiece dial 1 as a whole is also excellent. In addition, since the index 3 is manufactured using a composition in which the powder 31 is dispersed, the powder 31 is securely fixed to the hardened portion 32, and the powder 31 falls off when the timepiece dial 1 is used. Is effectively prevented. Therefore, the timepiece dial 1 is excellent in durability and reliability.

In the present invention, the index refers to things that contribute to the user's recognition of the time, the direction of the clock, the functions of the clock, the brand of the clock, the model number, and the like. Specific examples of the index include letters and numbers (so-called time letters), scales, symbols, various marks, and the like.
Curing of the curable resin is performed by a method according to the type of the curable resin. For example, when the curable resin is a thermosetting resin, it is performed by heating, and when the curable resin is a photocurable resin, it is performed by irradiation with light (energy rays).

  The average thickness of the index 3 formed in this step is not particularly limited, but is preferably 8 to 300 μm, and more preferably 10 to 200 μm. When the average thickness of the index 3 is a value within the above range, the solidity of the index 3 can be made particularly excellent while sufficiently improving the adhesion between the substrate 2 and the index 3. The aesthetic appearance of the timepiece dial 1 can be made particularly excellent. That is, when the average thickness of the index 3 is a value within the above range, both the aesthetic appearance and the durability of the timepiece dial 1 can be made particularly excellent. Further, when the average thickness of the index 3 is a value within the above range, the visibility of the index 3 can be made particularly excellent.

<Watch dial>
The timepiece dial 1 of the present invention is manufactured by the method as described above.
By being manufactured by the method as described above, the timepiece dial 1 has an excellent aesthetic appearance and is also excellent in durability.

<Clock>
Next, the timepiece of the present invention provided with the timepiece dial 1 of the present invention as described above will be described.
The timepiece of the present invention has the timepiece dial of the present invention as described above. In addition, as components other than the timepiece dial (the timepiece dial of the invention) constituting the timepiece of the invention, known parts can be used. Hereinafter, an example of the configuration of the timepiece of the invention will be described. Will be described.

FIG. 3 is a cross-sectional view showing a preferred embodiment of the timepiece (watch) of the present invention.
As shown in FIG. 3, a wristwatch (portable watch) 100 according to the present embodiment includes a case (case) 102, a back cover 103, a bezel (edge) 104, and a glass plate (cover glass) 105. . Further, in the case 102, the timepiece dial 1 and the movement 101 as described above are accommodated, and hands (pointers) not shown are accommodated.

The glass plate 105 is usually made of transparent glass or sapphire having high transparency. Thereby, the aesthetic appearance of the timepiece dial 1 can be sufficiently exhibited.
Although omitted in FIG. 3, the movement 101 includes, for example, a crystal oscillator as a time reference source, a semiconductor integrated circuit that generates a driving pulse for driving a clock based on the oscillation frequency of the crystal oscillator, In response to this drive pulse, the wheel train mechanism includes a step motor for driving the pointer every second, a wheel train mechanism for transmitting the movement of the step motor to the pointer, and the like.

A winding stem pipe 106 is fitted and fixed to the barrel 102, and a shaft 1071 of a crown 107 is rotatably inserted into the winding stem pipe 106.
The body 102 and the bezel 104 are fixed by a plastic packing 108, and the bezel 104 and the glass plate 105 are fixed by a plastic packing 109.
Further, a back cover 103 is fitted (or screwed) to the body 102, and a ring-shaped rubber packing (back cover packing) 114 is inserted in a compressed state at these joint portions (seal portions) 115. Has been. With this configuration, the seal portion 115 is liquid-tightly sealed, and a waterproof function is obtained.

A groove 1072 is formed on the outer periphery of the shaft 1071 of the crown 107, and a ring-shaped rubber packing (crown packing) 113 is fitted in the groove 1072. The rubber packing 113 is in close contact with the inner peripheral surface of the winding stem pipe 106 and is compressed between the inner peripheral surface and the inner surface of the groove 1072. With this configuration, the space between the crown 107 and the winding stem pipe 106 is liquid-tightly sealed, and a waterproof function is obtained. When the crown 107 is rotated, the rubber packing 113 rotates together with the shaft portion 1071 and slides in the circumferential direction while being in close contact with the inner peripheral surface of the winding stem pipe 106.
In the above description, a wristwatch (portable clock) is described as an example of a clock, but the present invention is similarly applied to other types of clocks such as a portable clock, a table clock, and a wall clock other than the wristwatch. be able to.

As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to these.
For example, the manufacturing method of the present invention may include steps other than those described above. For example, you may have the process of forming a coating layer in the surface side in which the parameter | index of the board | substrate was provided, or the opposite surface side. As a result, for example, the color tone and the like can be adjusted to further improve the aesthetic appearance of the timepiece dial, or as a whole timepiece dial, the corrosion resistance, weather resistance, water resistance, oil resistance, scratch resistance, Various characteristics such as wear and discoloration resistance can be improved. Such a coat layer may be removed, for example, when a timepiece dial is used.

In the configuration shown in the figure, the powder contained in the composition is composed of a base and a metal film. For example, at least one intermediate layer is provided between the base and the metal film. It may be.
In the above-described embodiment, the index is formed by applying the composition in a predetermined pattern to a part of the substrate. However, the composition may be applied to the entire surface of the substrate. Good. Further, the member formed by the method of the present invention may not function as an index.
In the above-described embodiment, the case where a substrate corresponding to the timepiece dial is used as the substrate for forming the index has been mainly described. However, a sheet-like member is used as the substrate for forming the index. After forming the sheet-like member, the sheet-like member may be processed into a timepiece dial by stamping or the like.

Next, specific examples of the present invention will be described.
1. Manufacture of timepiece dial (Example 1)
A timepiece dial was manufactured by the following method.
First, the board | plate which has the shape of the dial for timepieces was produced by press-molding the board | plate material comprised with the brass, and the necessary part was cut and grind | polished after that. The obtained substrate was substantially disc-shaped and had a diameter: 27 mm × thickness: 500 μm.

Next, this substrate was cleaned. As the cleaning of the substrate, first, alkaline immersion degreasing was performed for 30 seconds, then neutralization was performed for 10 seconds, washing with water for 10 seconds, and cleaning with pure water for 10 seconds.
A composition containing powder, an uncured thermosetting resin (urethane resin), and cyclohexane, isophorone and ethylene glycol monobutyl ether as a solvent is screen-printed on the surface of the substrate thus cleaned. It gave with the shape and pattern as shown in 2 (composition provision process). As a powder constituting the composition, a metal layer composed of Al was formed on both surfaces of a sheet material composed of a polyester resin (average thickness: 20 μm) by vacuum deposition, and then the sheet material was formed into a 100 μm square. What was cut into a square shape was used. The average thickness of the metal layers (metal films) provided on both surfaces of the sheet material made of polyester resin was 0.5 μm. Moreover, all the Al content rates in the metal layer (metal film) provided on both surfaces of the sheet | seat material comprised with the polyester resin were 99.9 wt% or more. The solvent used was a mixture of cyclohexane, isophorone and ethylene glycol monobutyl ether in equal amounts (same weight). The viscosity of the composition used in this step at 25 ° C. was 17000 cps. The screen plate includes a mesh made of a wire made of polytetrafluoroethylene and a plate film formed in a predetermined pattern by a photoengraving method using a photoresist material, and has a mesh roughness of 70. No. and wire diameter of 60 μm were used. Moreover, as a squeegee, what was comprised with the urethane type rubber was used.

Next, the substrate was heated on a hot plate at 80 ° C. for 30 minutes to cure the curable resin, form a cured portion, and form an index (resin curing step). As a result, a timepiece dial as shown in FIGS. 1 and 2 was obtained.
In the obtained timepiece dial, the average thickness of the index was 100 μm.
In addition, the thickness of the board | substrate and the parameter | index was measured in accordance with the microscope cross-section test method prescribed | regulated by JISH5821.

(Examples 2 to 11)
A timepiece dial was manufactured in the same manner as in Example 1 except that the composition of the powder and solvent, the substrate and the screen plate contained in the composition were changed as shown in Table 1.
(Example 12)
Except for using ethanol instead of cyclohexane as a solvent in the composition, using an epoxy resin (thermosetting resin) as the curable resin, and using a polyester resin sheet having an average thickness of 25 μm as the base of the powder, A timepiece dial was manufactured in the same manner as in Example 8.
(Example 13)
As the curable resin, an epoxy resin (ultraviolet curable resin) is used, except that the curable resin is cured by irradiating ultraviolet rays from the surface side to which the composition of the substrate in the resin curing step is applied. A timepiece dial was manufactured in the same manner as in Example 1.

(Comparative Example 1)
As a powder contained in the composition, after forming a metal layer composed of Al by vacuum deposition on only one side of a sheet material (average thickness: 20 μm) composed of a polyester resin, the sheet material is made 100 μm. A timepiece dial was manufactured in the same manner as in Example 1 except that the one cut into a square shape was used.
(Comparative Example 2)
A watch dial was manufactured in the same manner as in Example 1 except that a film-like metal powder (average thickness: 20 μm, 100 μm square) substantially composed only of Al was used as the powder.

(Comparative Example 3)
Except not including powder as a composition to be subjected to screen printing, the same one as used in Example 1 was used. After screen printing and before curing of the curable resin, the powder was cured on the substrate. A timepiece dial was manufactured in the same manner as in Example 1 except that it was sprinkled on a resin (patterned curable resin).

(Comparative Example 4)
A timepiece dial was manufactured by the following method.
First, the board | plate which has the shape of the dial for timepieces was produced by press-molding the board | plate material comprised with the brass, and the necessary part was cut and grind | polished after that. The obtained substrate was substantially disc-shaped and had a diameter: 27 mm × thickness: 500 μm.
Next, a through hole for attaching an index was formed in a portion of the substrate where an index should be provided. The diameter of the through hole was 500 μm.
Next, this substrate was cleaned. As the cleaning of the substrate, first, alkaline immersion degreasing was performed for 30 seconds, then neutralization was performed for 10 seconds, washing with water for 10 seconds, and cleaning with pure water for 10 seconds.

On the other hand, two types of index members (a first index member and a second index) each having a display portion to be placed on a base material and a foot portion for mounting by press-molding an aluminum plate material. Member). Regarding the first indicator member, the display portion had a width of 1.0 mm, a length of 2.0 mm, and a height of 140 μm. Further, regarding the first index member, the foot length was 500 μm and the foot diameter (thickness) was 200 μm. Moreover, the width | variety of the display part about the 2nd indicator member was 1.5 mm, length was 3.5 mm, and height was 140 micrometers. Further, regarding the second indicator member, the foot length was 500 μm and the foot diameter (thickness) was 200 μm.
Next, by inserting the foot part of the index member (planting material) into the through hole of the base material, and by applying an epoxy adhesive from the side opposite to the surface where the index member is inserted, The indicator member was fixed to the substrate. As a result, a timepiece dial was obtained.

  Table 1 summarizes the configuration of the timepiece dial of each example and each comparative example. In the table, brass is BS, stainless steel (SUS304) is SUS, polycarbonate containing carbon black is PC, acrylonitrile-butadiene-styrene copolymer (ABS resin) containing carbon black is ABS, and carbon black is contained. Polyethylene terephthalate is PET, acrylic resin containing carbon black is PMMA, polyester resin is PEs, polytetrafluoroethylene is PTFE, epoxy resin is EPO, urethane resin is PUR, acrylic resin is AC, cyclohexane is CHXA, isophorone Is IP, ethylene glycol monobutyl ether is EGMB, and ethanol is EtOH. In the table, the viscosity column shows the value of the viscosity at 25 ° C. In addition, the content rate of the material shown in Table 1 in each site | part of the timepiece dial was all 99 wt% or more.

2. 2. Appearance evaluation of timepiece dial 2-1. Glossiness Evaluation Each watch dial plate manufactured in each of the above Examples and Comparative Examples was visually and microscopically observed, and the appearance was evaluated according to the following five criteria.
A: An extremely excellent glossiness is exhibited.
B: Exhibits excellent gloss.
C: Good glossiness is exhibited.
D: Glossiness is slightly inferior.
E: The glossiness is inferior.

2-2. Stereoscopic evaluation Each watch dial plate manufactured in each of the above examples and comparative examples was visually observed, and these stereoscopic effects were evaluated according to the following five-stage criteria.
A: Extremely excellent.
B: Excellent.
C: Good.
D: Somewhat bad.
E: Defect.

2-3. Comprehensive Appearance Evaluation Each watch dial plate manufactured in each of the above Examples and Comparative Examples was visually and observed with a microscope, and the appearance was evaluated according to the following five criteria.
A: Extremely excellent.
B: Excellent.
C: Good.
D: Somewhat bad.
E: Defect.

3. Durability Evaluation Each timepiece dial manufactured in each of the above examples and comparative examples was subjected to the following three types of tests to evaluate the durability of the timepiece dial.
3-1. Evaluation by drop test About each timepiece dial produced in each of the above Examples and Comparative Examples, after being dropped 100 times repeatedly from a height of 3.5 m onto a stainless steel 12 cm thick block, The appearance of the timepiece dial was visually observed, and the appearance was evaluated according to the following four-stage criteria.
A: No lifting or peeling of the index is observed.
B: Almost no floating or peeling of the index is observed.
C: Slight lifting or peeling of the index is observed.
D: Detachment of powder, or floating or peeling of the index is clearly recognized.

3-2. Evaluation by Bending Test For each timepiece dial manufactured in each of the above examples and comparative examples, a steel bar with a diameter of 3.2 mm is used as a fulcrum and bent at 35 ° with respect to the center of the timepiece dial. After that, the appearance of the timepiece dial was visually observed and evaluated according to the following four criteria. Bending was performed in both compression / tension directions.
A: No lifting or peeling of the index is observed.
B: Almost no floating or peeling of the index is observed.
C: Slight lifting or peeling of the index is observed.
D: Detachment of powder, or floating or peeling of the index is clearly recognized.

3-3. Evaluation by Thermal Cycle Test Each timepiece dial produced in each of the above Examples and Comparative Examples was subjected to the following thermal cycle test.
First, the timepiece dial is placed in a 20 ° C environment for 1 hour, then in a 50 ° C environment for 1 hour, then in a 20 ° C environment for 1 hour, and then in a -20 ° C environment for 1 hour. Left to stand. Thereafter, the environmental temperature was returned again to 20 ° C., which was set to one cycle (4 hours), and this cycle was repeated a total of 6 times (total 24 hours).
Thereafter, the appearance of the timepiece dial was visually observed, and the appearance was evaluated according to the following four-stage criteria.

A: No lifting or peeling of the index is observed.
B: Almost no floating or peeling of the index is observed.
C: Slight lifting or peeling of the index is observed.
D: Detachment of powder, or floating or peeling of the index is clearly recognized.
These results are shown in Table 2.

As is clear from Table 2, the timepiece dial of the present invention exhibited a glossy and excellent aesthetic appearance and was also excellent in durability. In addition, in the present invention, a timepiece dial having an excellent three-dimensional effect of the index was obtained. In particular, according to the present invention, a timepiece dial having an excellent aesthetic appearance in which no bleeding or the like is observed is obtained. In the present invention, the timepiece dial is also excellent in productivity.
On the other hand, in the comparative example, a satisfactory result was not obtained.
Further, a timepiece as shown in FIG. 3 was assembled using the timepiece dials obtained in the respective Examples and Comparative Examples. Each timepiece thus obtained was tested and evaluated in the same manner as described above, and the same results as described above were obtained.

It is sectional drawing which shows suitable embodiment of the manufacturing method of the timepiece dial of this invention. It is a top view which shows suitable embodiment of the timepiece dial of this invention. It is a fragmentary sectional view which shows suitable embodiment of the timepiece (watch) of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Timepiece dial 2 ... Board | substrate (Dial board main body) 3 ... Indicator | index 31 ... Powder 311 ... Base part 312 ... Metal film 32 ... Hardened part 8 ... Screen plate 81 ... Mesh 811 ... Wire 82 ... Plate film 9 ... Squeegee 101 ... Movement 102 ... Body (case) 103 ... Back cover 104 ... Bezel (edge) 105 ... Glass plate (cover glass) 106 ... Winding pipe 107 ... Crown 1071 ... Shaft part 1072 ... Groove 108 ... Plastic packing 109 ... Plastic packing 113 ... Rubber packing (Crown packing) 114 ... Rubber packing (back cover packing) 115 ... Joint part (seal part) 100 ... Watch (portable watch)

Claims (9)

A composition application step for applying a composition containing a powder and a curable resin on a substrate by screen printing;
A resin curing step of curing the curable resin and forming a cured portion,
As the powder, a powder having an average particle diameter of 100 to 155 μm and provided with a metal film made of a metal material on both sides of a plastic base ,
As the composition, one having a viscosity of 8000 to 20000 cps at 25 ° C. is used.
In the screen printing, as a screen plate, at least the surface is provided with a wire composed of polytetrafluoroethylene, the mesh roughness is 20 to 120, and the diameter of the wire is 50 to 120 μm A method for manufacturing a timepiece dial, characterized in that 2. The timepiece dial manufacturing method according to claim 1 , wherein the composition contains one or more selected from the group consisting of cyclohexane, isophorone and ethylene glycol monobutyl ether. The average thickness of the powder, the manufacturing method of the timepiece dial according to claim 1 or 2 which is 10 to 30 [mu] m. The method for manufacturing a timepiece dial according to any one of claims 1 to 3 , wherein the base is made of a polyester resin. The average thickness of the metal film, the manufacturing method of the timepiece dial according to any one of claims 1 to 4 is 0.01 to 3.0 m. The curable resin, the manufacturing method of the timepiece dial according to any one of claims 1 to 5 which is a light-curing resin. The curable resin, urethane resin, one or a claims 1 to contain two or more kinds to the production method of the timepiece dial according to any one of the 6 selected from the group consisting of epoxy resins and acrylic resins. Timepiece dial characterized in that it is manufactured using a method according to any one of claims 1 to 7. A timepiece comprising the timepiece dial according to claim 8 .

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