JP2000141995A - Manufacture of lacquer work and personal ornament coated with lacquer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the adhesion and impact resistance of lacquer, to expand the variety of design of lacquer coating and to improve weather resistance on the occasion when lacquer is applied to a metal base. SOLUTION: A substrate pretreatment process (step S1) wherein the roughness of the surface of a metal base is made 1-50 μm, a priming process (step S4) wherein lacquer containing a pigment is applied as prime coat lacquer, in a thickness of 10-50 μm, on the surface of the metal base, a metal powder mixing-in process (step S5) comprising a metal powder applying process wherein metal powder of the same material as the metal base is applied with lacquer and a settling process wherein drying is made at a constant temperature for settling the metal powder, a first baking-drying process (step S6) wherein baking and drying are made at a high temperature of 100 deg.C or above, a grinding process (step S8) wherein the surface of the prime coat lacquer is ground, an intercoat applying process (step S9) wherein intercoat is applied, a lacquering process (step S11) wherein lacquering is conducted, a lustering process (step S13) wherein the surface of a lacquer film is lustered and a second baking-drying process (step S15) wherein baking and drying are made again at a high temperature of 100 deg.C or above, are conducted sequentially.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a lacquered product having lacquer mounted on a surface of a metal substrate or the like, and to an ornament such as a broach or an earring formed by lacquering a substrate such as gold or silver.

[0002]

2. Description of the Related Art Conventionally, in lacquer coating, wood and bamboo are extremely often used as a base material. However, lacquer is rarely applied to a metal substrate. In recent years, it has been known that gold, silver, and bronze medals of the Olympic Games were lacquered.

Conventionally, lacquer processing of a metal base material is performed by adding a pigment to an undercoat lacquer to make black or red lacquer.
Apply undercoat. Thereafter, baking and drying are performed at a high temperature of 100 ° C. or higher. Further, it is common to apply a middle coat and a finish coat after polishing the surface. in this way,
According to the method of baking lacquer at a high temperature, according to page 62 of "Introduction to Lacquer Art" (published by Kogei Publishing Co., Ltd.) issued on December 20, 1984, it is a technique that has been used for a long time.

Further, in order to increase the adhesiveness of lacquer, the surface of a metal substrate is roughened with sandpaper or the like, or a primer treatment is performed. As the primer treatment, a chromate treatment for performing chromium plating, a parkerizing treatment as electrolytic etching, an alumite treatment for an aluminum metal base material, a resin coating treatment (see JP-A-5-34467), and the like are known.

[0005] Furthermore, a decorative plate made of stainless steel coated with lacquer (see Japanese Patent Application Laid-Open No. 8-91000), a color picture in which different colors of lacquer of different colors are applied to the surface of the stainless steel using stainless steel as a craft base material. A method of manufacturing a craft having a pattern (see Japanese Patent Application Laid-Open No. 6-320104), a technique of treating a metal frame with a processing agent in which a synthetic resin and lacquer are mixed for the purpose of decorating the metal frame surface of eyeglasses. (See JP-A-5-230421), a technique in which an epoxy primer and a metal clear are applied to the surface of a bronze, and a material obtained by dissolving a gold powder in the natural lacquer is applied thereon (see JP-A-5-177990). etc,
Various techniques using a metal substrate are known.

[0006] Also, there are a few products made of lacquer in conventional metal accessories. For example, a broach developed earlier by the present applicant, that is, a broach (1
(See Nihon Keizai Shimbun on August 3, 998)
Japanese Patent No. 94406 discloses a decorative accessory in which a decorative sheet coated with lacquer is engaged with a support such as a metal casting.

[0007] Furthermore, the lacquer film is weak in weather resistance, particularly in ultraviolet rays, and when exposed to direct sunlight for a long period of time, the gloss of the surface is reduced, and chalking tends to occur. This phenomenon is a very important issue for accessories such as brooches worn when going out when using lacquer. In the past, in order to prevent this phenomenon, a technique in which an organic solvent solution of lacquer and an organic solvent solution of titanium alkoxide were mixed and titanium oxide generated by hydrolysis of titanium alkoxide was contained in the lacquer (Japanese Patent Laid-Open No. Hei 5- No. 320576) has been developed.

[0008]

Conventionally, various methods of coating lacquer on a metal substrate include baking and drying treatment, primer treatment, and adhesion of lacquer by a technique disclosed in each publication. Although the strength is increased, it is still vulnerable to micro-vibration, causing a problem that the lacquer portion peels off during ultrasonic cleaning. In addition, when an impact such as dropping is applied, a phenomenon that the lacquer portion is peeled off tends to occur.

[0009] Although there are a few products in which a broach of a metal substrate is subjected to lacquer processing, the types thereof are extremely limited because the product is small and the lacquer processing itself on the metal substrate is difficult. The accessory described in Japanese Patent Application Laid-Open No. 8-294406 does not apply lacquer processing to the metal base material itself. The only accessory that has lacquer processing applied to the metal base material is the only product developed by the present applicant. It has become.

The product previously developed by the present applicant employs a technique conventionally used for the decoration of a Japanese sword in the form of a sword, and has a considerable adhesion strength. However, considering how to handle the broach, there are many points that need to be further improved, for example, when it is desired to perform a large and reliable cleaning in the process of manufacturing the broach, ultrasonic cleaning is adopted, but from the problem of lacquer peeling, Currently, they are manually cleaned. Also, broaches are often dropped accidentally when attached to clothes, or the broach that the pin has come off and falls off often occurs.
Peeling of the lacquer part is slight but still occurs.

In addition, ornaments such as broaches are important for their decorativeness and require a variety of designs.
Conventional broaching of a metal substrate or the like is still insufficient. Furthermore, accessories are often exposed to external light, and prevention of chalk of lacquer is particularly required.
The technology described in No. 76 is a base coat lacquer film, an intermediate coat lacquer film,
Since titanium oxide is generated in each lacquer film such as a finished lacquer film, the texture of each lacquer film tends to be impaired.

Undercoat lacquer is a part where adhesion to a metal substrate is regarded as important. If a large amount of titanium oxide is present, the lacquer hardens and the adhesion is impaired. In the technique disclosed in Kaihei 5-320576,
Since titanium oxide is obtained by hydrolysis, the content of titanium oxide changes depending on the degree of hydrolysis, and sometimes a predetermined amount or more of titanium oxide is generated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and improves the adhesion and impact resistance of lacquer when performing lacquer processing on a metal substrate such as a noble metal broach. It is an object of the present invention to provide a method for producing a lacquered product to be obtained, and a lacquer-applied accessory having improved adhesion strength and impact resistance. Another invention provides a method of manufacturing a lacquered product that can expand the variety of designs of lacquer processing applied to a metal substrate, a wooden substrate, and the like, and a lacquer-applied accessory improved in lacquer design. The purpose is to do. Still another object of the present invention is to provide a method for producing a lacquered product capable of improving weather resistance and a decorative article subjected to lacquer processing.

[0014]

In order to achieve the above-mentioned object, a method for producing a lacquered product according to the present invention comprises the steps of: a base pretreatment step for making the surface of a metal base material have a roughness of 1 to 50 μm; Lacquer with pigment on the surface of metal substrate as 10-50μm
An undercoating step of applying a metal powder of the same material as the metal base material, a metal powder sowing step, a precipitation step of drying at a constant temperature to precipitate the metal powder, and a high temperature of 100 degrees Celsius or more. The first baking and drying process of baking and drying, the grinding process of grinding the undercoat lacquer surface, the middle coating process of applying the middle coating lacquer, the lacquering process of lacquer lacquer processing, and the luster processing of the surface of the lacquer film. And a second baking / drying step of baking / drying again at a high temperature of 100 ° C. or more, and each step is performed in order.

Since the re-baking and drying (second baking and drying) is performed as described above, the adhesion of the lacquer film to the metal base material is improved, and the impact resistance is improved. Also, the surface of the metal substrate is
Since the metal powder of the same material as the metal base material is mixed into the undercoat lacquer, the adhesion between the metal base material and the undercoat lacquer film is further improved.

In another invention, in addition to the above-described method for producing a lacquered product, the metal powder has an average particle size of 5 to 150 μm, and a finishing coating step of applying a finishing lacquer after the lacquer work is provided. And titanium oxide powder is mixed in the finished lacquer.

Thus, the average particle size of the metal powder is 5 to 15
Since it is 0 μm, it matches with the surface roughness of the metal base material, the adhesion of the lacquer film is further improved, and the impact resistance is also improved.

Further, in another aspect of the present invention, there is provided a method of manufacturing a lacquered product in which a lacquer is applied to the surface of a metal substrate. The method has a metal powder sowing step of sowing metal powder having the same material as the material or a material having a specific gravity close to the average particle diameter of 5 to 150 μm, and a precipitation step of precipitating the sowed metal powder.

As described above, since the metal powder of the same material as the metal base material or a material having the same specific gravity is sowed and settled on the undercoat lacquer, the adhesion between the metal base material and the undercoat lacquer film is improved. Moreover, since the average particle size of the metal powder is as small as 5 to 150 μm, the influence on the visible light is small, and the texture is not largely changed or deteriorated.

According to another aspect of the present invention, there is provided a method for manufacturing a lacquered product in which lacquer is applied to a surface of a metal substrate, the method comprising: forming an uneven portion on the surface of the metal substrate; Undercoat lacquer with metal powder of 1 to 100 μm in volume ratio of 30 to
After mixing and kneading, the undercoating step of coating the concave portion of the metal substrate after kneading, followed by the intermediate coating step of applying the intermediate coating lacquer to the concave portion, and the lacquer lacquer processing of the concave portion after the intermediate coating step. Processing step.

In the present invention, the metal substrate is provided with an uneven portion,
Since the lacquer processing is performed on the concave portion, it is possible to partially coat the metal base material. Moreover, since the undercoat lacquer mixed with the metal powder is applied to the metal base material, the lacquer film hardly peels off even in the case of partial lacquer processing.

According to another aspect of the present invention, there is provided a method for manufacturing a lacquered product in which lacquer is applied to the surface of a metal substrate, the method comprising: forming an uneven portion on the surface of the metal substrate; Undercoating lacquer is mixed with rust soil and metal powder of 1 to 100 μm in a volume ratio of 30 to 50%, and after kneading, an undercoating step of coating a concave portion of the metal base material, and thereafter, applying an intermediate lacquer to the concave portion. It has an intermediate coating step and a lacquer processing step of lacquering the concave portions after the intermediate coating step.

In the present invention, the metal substrate is provided with an uneven portion,
Since the lacquer processing is performed on the concave portion, it is possible to partially coat the metal base material. Moreover, since the undercoating lacquer mixed with the metal powder and the rust soil is applied to the metal base material, the lacquer film hardly peels off even in the partial lacquer processing. Also, due to the incorporation of rust soil, peeling of the intermediate-coated lacquer film does not easily occur even if the intermediate-coated lacquer is thickened.

[0024] Further, in addition to the method for producing a lacquered product of each of the above-mentioned inventions, other inventions can be produced as an undercoat lacquer,
A refined black such as a black one is used. in this way,
Since the refined lacquer is used as the undercoat lacquer, it is easy to knead the metal powder or the rust soil into the undercoat lacquer, and the metal powder is mixed into the lacquer on average.

According to another aspect of the present invention, there is provided a method of manufacturing a lacquered product in which lacquer is applied to a surface of a base material.
Engraving process to make the depth to the part of the lacquer mixed with metal powder or its vicinity, and then, after imprinting the transparent on the engraved part, and depositing metal powder or metal foil, have.

In the present invention, since the engraving is performed with a laser, the grooves and holes formed by the laser have a wide inner side. In addition, the metal to be deposited contacts the metal powder in the undercoat lacquer. For this reason, the metal powder or metal foil to be deposited does not easily come off from the grooves or holes. In addition, laser engraving can handle extremely precise and complicated patterns, thus increasing the variety of designs. In addition, although a metal is preferable as a base material, it can also be applied to other base materials such as wood and bamboo.

According to another aspect of the present invention, there is provided a method of manufacturing a lacquered product in which a lacquer is applied to the surface of a metal substrate. And a plating step of performing plating by electroplating on the engraved portion thereafter.

In the present invention, since engraving is performed with a laser, grooves and holes formed by the laser have a wide shape on the back side, and the metal material to be plated is in contact with the metal substrate. For this reason, the metal material to be plated does not easily come off the grooves or holes. In addition, laser engraving can handle extremely precise and complicated patterns, thus increasing the variety of designs.

Further, in another invention, in a method for producing a lacquered product in which lacquer is applied to the surface of a base material, at least one of an intermediate-coated lacquer and a finished lacquer when a finished lacquer is used. Titanium oxide powder in a volume ratio of 0.1 to
Contains 3%. In this way, by slightly mixing the titanium oxide powder into the intermediate lacquer and finish lacquer,
It can improve the ultraviolet shielding effect and improve the weather resistance of the lacquer film. Moreover, the texture of the lacquer film is not significantly changed or impaired. Furthermore, since titanium oxide is not mixed into the undercoat lacquer film, adhesion is not impaired. In addition, since the titanium oxide is mixed as the powder, the mixing ratio does not exceed the expected value.

According to another aspect of the present invention, there is provided a method of manufacturing a lacquered product in which a metal substrate is coated with a metal powder, Thereafter, a first baking drying step of baking and drying at a high temperature of 100 ° C. or more, and a second baking and drying step of re-baking and drying at a high temperature of 90 ° C. or more after the polishing finish processing performed thereafter. Have.

Since the re-baking drying (second baking drying) is performed in this manner, the adhesion of the lacquer film to the metal substrate is improved, and the impact resistance is improved. In addition, since metal powder is mixed in the undercoat lacquer film, the metal powder is firmly bound to the metal substrate by twice baking and drying, and the adhesion is further improved.

Further, in another invention, in addition to the above-mentioned method for producing a lacquered product, the temperature in the second baking and drying step is lower than the temperature in the first baking and drying step. As described above, since the temperature of the second baking and drying after the polishing process is set lower than the temperature of the first baking and drying, the undercoat lacquer film firmly adhered to the metal substrate in the first baking and drying step. The effect on the environment is small. Further, even if the adhesion is insufficient during the first baking and drying, the adhesion is further improved by the second baking and drying.

In addition, the lacquered accessory of the present invention is:
In an accessory that has at least an undercoat and a middle coat lacquer applied to the surface of the metal substrate, the undercoat lacquer film applied to the surface of the metal substrate has the same material as the metal substrate or a specific gravity of 10%
Metal powder of the material which is different from the above is mixed.

As described above, since the metal powder of the same material as the metal base material or a material having the same specific gravity as the metal base material is mixed in the undercoat lacquer film, the lacquer film is peeled off by the contact between the metal base material and the metal powder. It will be difficult.

Further, in another invention, in addition to the lacquer-applied accessory, the surface of the metal substrate has a roughness of 1 to 50 μm, and the average particle size of the metal powder is 1 to 150 μm. For this reason, the adhesion between the metal powder and the metal substrate is further improved, and peeling of the lacquer film is more unlikely to occur.

Further, in another invention, in addition to the lacquered accessories of the above-mentioned inventions, 30% of the volume of the undercoat lacquer film is contained.
Approximately 50% is a component of metal powder or metal powder and rust soil, and the average particle size of the metal powder is 1 to 100 μm. For this reason,
Metal powder or metal powder and rust soil are sufficiently mixed into undercoat lacquer,
Even when partially lacquered, the lacquer film does not peel off, and can be adequately handled. Furthermore, when thickening the middle coat lacquer, the lacquer film does not peel off.

In addition, in another invention, in addition to the lacquer-applied accessories of the above-mentioned inventions, an uneven portion is provided on a metal base material, and a lacquer film such as an undercoat lacquer film containing metal powder is formed in the concave portion. And
The lacquer film is not formed on the convex part. For this reason,
A lacquer film is formed in the recess, so that a so-called partial lacquer coating can be formed with sufficient impact resistance.

In addition, the lacquer-applied accessory of another invention is an accessory that has at least a base coat and an intermediate coat lacquer applied to the surface of a base material. At least one of the coated lacquer film and the finished lacquer film contains 0.1 to 3% by volume of titanium oxide powder having an average particle size of 0.1 to 0.5 μm.

As described above, by slightly mixing the titanium oxide powder into the intermediate lacquer or the finished lacquer, the ultraviolet ray shielding effect is improved, the weather resistance of the lacquer film is improved, and the texture inherent in the lacquer film is originally improved. There is no significant change or loss. Moreover, since titanium oxide is not mixed into the undercoat lacquer film, the adhesion is not impaired. further,
Since the titanium oxide is mixed as the powder, the mixing ratio does not exceed the expected value.

[0040] In the decorative article which has been subjected to lacquer processing according to another invention, the diameter of the deep side is larger than the diameter of the shallow side in the depth direction of the lacquer film in the decorative article which has been subjected to lacquer processing on the surface of the base material. A groove or hole is provided, in which metal powder or metal foil is deposited or metal is deposited by metal plating.

Since the grooves and holes in the present invention are wide on the back side, it is difficult for conventional metal deposits or metal deposits formed by metal plating to come off from the grooves or holes. Therefore, even if various patterns are formed on the lacquer film, the patterns do not peel off. As a result, the design can be improved. The grooves and holes in the present invention can be easily formed by laser engraving.

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Note that what is shown in this embodiment is a broach or pendant in which a lacquer film is formed on a noble metal using gold or silver as a base material (base material), but other metal materials such as copper or aluminum are used as base materials. The present invention can also be applied to accessories, accessories other than broaches and pendants, and the like.

First, a method for producing a lacquered product will be described. The method of manufacturing a lacquered product mainly includes the following steps.

First, the surface 2 of the gold or silver substrate 1 is roughened,
The surface is rough. As shown in FIG. 2, the surface has a surface roughness such that a distance L between the convex and the convex is 1 to 50 μm. This roughening operation is performed by physically grinding the surface 2 of the base material 1 in the base pretreatment (step S1). For example, it is performed by honing, blank grinding, and electrolytic polishing. If the surface of the substrate 1 such as a broach is too rough, the gloss of the surface due to the lacquer applied in a later step becomes uneven. In order to avoid unevenness, the number of times of intermediate coating described later must be increased. On the other hand, if the surface of the substrate 1 is too fine, the adhesion to the lacquer will be poor.

Next, the conventional primer treatment (step S2) is performed as required. In this embodiment, a plating process using chromate is performed. next,
A protective coat process (Step S3) is performed. This is to coat the back side with resin rubber so that the lacquer does not turn to the back side of the broach or the like.

Thereafter, a lacquer containing a pigment is applied to the surface 2 of the substrate 1 to a thickness of about 10 to 50 μm as a first undercoat (step S4). As the undercoating lacquer, a refined urushi such as a raw urushi or a black urushi is used.

Next, before the undercoat lacquer dries, the metal powder 3 having an average particle diameter in the range of 5 to 150 μm is sown and precipitated (step S5). The metal powder 3 is made of the same material as the base material 1 or a material having a specific gravity close thereto, specifically, a material having a specific gravity within ± 10% of the base material 1. In this embodiment, gold powder is used when the base material 1 is made of gold, and silver powder is used when the base material 1 is made of silver. The reason why the metal powder 3 is made of the same material as the base material 1 or a material having a specific gravity close to the base material 1 is to prevent the lacquer portion from peeling off by vibration when the finished product is subjected to ultrasonic cleaning.

After sowing the metal powder 3, the metal powder 3 is dried at 40 to 70 ° C. and a humidity of 40% or less for 60 to 120 minutes. During this time, the lacquer does not harden and maintains a fluid state, while the metal powder 3 precipitates by its own weight. And the thing which contacts the base material 1 increases.

After the mixing of the metal powder 3, the first baking and drying is performed at 100 to 200 ° C., preferably 120 to 180 ° C. for 60 to 180 minutes (step S6). In this embodiment, the baking and drying is performed at 130 ° C. for 90 minutes. In addition, after mixing of the metal powder 3 and before the first baking and drying, the undercoating lacquer film 4 is subjected to rough sharpening, the back surface cleaning such as a broach, and the undercoating lacquer film 4 polishing (fine sharpening). Is also good. After baking and drying, if necessary, a protective sheet is applied to the back surface of the broach or the like again, and the back surface is inspected.

Next, lacquer containing a pigment for producing various colors is repeatedly applied a plurality of times (step S7). This undercoating repetition process is performed as needed, and the number of times is also determined as appropriate. In this embodiment, undercoating is performed three times in this step. Baking drying (Step S6)
After or when the undercoat is performed, the undercoat is repeated (step S7), and then the surface of the undercoat lacquer film 4 is ground (step S8). This surface grinding is performed with a brush or sandpaper or the like, and the surface roughness (distance L between the convex and convex surfaces) is set to about 1 to 30 μm.

Thereafter, the lacquer containing a pigment is applied a plurality of times as an intermediate lacquer (step S9) to form intermediate lacquer films 5 and 6. At the time of this intermediate coating, a titanium oxide powder having an average particle size of 0.1 to 0.5 μm was used in the lacquer to be used in a volume ratio of 0.1 to
Add ~ 3%. Titanium oxide powder is mixed for weather resistance, especially for measures against ultraviolet rays. If the amount is too large, the lacquer hardens and the lacquer films 5 and 6 become unstable. On the other hand, if the amount of titanium oxide is too small, the effect of weather resistance is almost lost. Here, the weather resistance means that the lacquer part is exposed to rain or sunlight and the color fades.

When gold is mixed or a black pigment (dye) is added, that is, when gold or black is added, even if titanium oxide powder is mixed, the weather resistance is hardly improved. However, in the case of a color weak to ultraviolet rays such as vermilion, green, and yellow, the weather resistance is greatly improved. According to an exposure test for weather resistance performed by arc discharge, in the case of green or yellow, adding about 1% of titanium oxide powder extends the time during which the color does not fade. In other words, when not added, the color fades in about 50 hours, but by adding the titanium oxide powder, the color does not fade up to about 120 hours.

In general, broaches and pendants are often worn under fluorescent lights, and the effect of improving the weather resistance is great. The mixing of the titanium oxide powder has a sufficient effect even when the substrate 1 is not a metal, that is, a material such as wood or bamboo. The titanium oxide powder may be mixed into the undercoat lacquer, but the effect is small in consideration of the amount of transmitted ultraviolet light. In this embodiment, the titanium oxide powder is mixed into the intermediate lacquer and a finish lacquer described later.

In the intermediate coating, a film of 10 to 30 μm is formed each time. Further, in this embodiment, the intermediate coating is 2
It has been performed a number of times, but may be another number. The number of times is determined by the number of times required for the surface of the lacquer film to become flat and the purpose of design such as a broach. At the time of the intermediate coating, gold powder or silver powder is sowed as necessary.

After the intermediate coating (step S9), the intermediate coating lacquer film 6
Is polished (step S10). Thereafter, lacquer work (step S11) is performed. Makie is a type of decorative technology that applies decorative patterns to lacquer ware, and is a representative technology that is central to lacquer ware technology in Japan. The lacquer work for lacquer work is performed once or more than once, but in this embodiment, it is performed twice.

By performing the lacquer work (step S11), the lacquering can be completed. However, in this embodiment, the finish coating is further performed (step S12). The finish coat is applied thinner than the intermediate coat, and the finish lacquer films 7 and 8 are formed. In the case of performing the finish coating, thereafter, the surface of the finish lacquer film 8 is subjected to gloss processing (step S13). In this gloss processing, various techniques such as abrasion polishing are adopted.

Next, a lacquer processing (step S14) is performed. This treatment is performed by wiping the glossy surface with absorbent cotton containing fresh net lacquer thinly in the same manner as conventionally performed on a wooden base material. The lacquered lacquer film 9 is formed by this lacquered lacquer processing, but this processing may be omitted.
In this embodiment, the application of lacquered lacquer is performed several times,
Polishing is performed after each application.

Thereafter, baking drying (second baking drying) is performed again (step S15). This baking drying is performed at 90 to 180 ° C, preferably at 100 to 150 ° C, for 3 hours.
Perform for 0-90 minutes. In this embodiment, at 120 ° C., 6
Going for 0 minutes. If the second baking and drying is not performed, the following problem occurs. That is, when the silver base material 1 is used, when each lacquer film is formed, when rhodium plating is performed on the back side of the silver base material 1, or when the base material 1 such as gold is used, plating plating described below is performed. At that time, the lacquer film cannot withstand, resulting in a defective product. As described above, the second baking drying is indispensable for the next plating process (step S16).

After baking and drying, if the substrate 1 is silver, the back side of the broach is plated with rhodium (step S1).
Perform 6). When the base material 1 is made of another metal material, plating is performed as necessary or in relation to the design. After the plating process, a gloss polishing process (step S17) is performed using a color buff or the like. Then, ultrasonic cleaning (Step S1)
8) Finish cleaning is performed. Ultrasonic cleaning is a preferred cleaning method when mass-producing broaches and pendants,
When mass production is not performed, cleaning may be performed with a single item, single item cotton swab or the like.

Thereafter, an appearance inspection for visually inspecting for the presence of scratches, dirt, unevenness, etc. is performed (step S19). Finally, a completion inspection is performed by irradiating ultraviolet rays and confirming with a microscope whether there is any change (step S20). If there is no problem in appearance inspection and completion inspection, accessories as finished products will be shipped.

The process from the final coating (step S12) to the ultrasonic cleaning (step S18) may or may not be adopted depending on the product specifications. Also,
When performing the lacquer processing (step S14) from the finish coating (step S12), the second baking and drying (step S14)
Preferably, 15) is performed. Further, in this embodiment, the plating process (step S16) and the ultrasonic cleaning (step S18) are performed, but may not be performed as described above. The thickness of the lacquer film thus formed is 50 to 150 μm in total. In the above description, the number of painting operations is not increased, but the actual lacquering operation is about 10 to 20 times.

FIG. 4 shows an application example of the present invention to a broach 10 to which the processing steps from the above-described step S1 (base pre-processing) to step S20 (completion inspection) have been performed, and furthermore, a fastener 11 has been brazed. The broach 10 uses a silver base material 1 and has a petal pattern 12 and a flower pattern 13 formed by lacquer painting on the surface. On the back side, a back side member 14 to which a fastener 11 is brazed is welded, and rhodium plating is further applied to the entire back side.

The broach 10 shown in FIG. 4 is entirely coated with lacquer. That is, lacquer is applied to the entire surface of the broach 10. On the other hand, in the case where the frame 21 exists or the sakai 22 exists between the lacquer portions, as in the case of the decorative member 20 of the pendant shown in FIGS. I have. FIG.
Indicates a state before the lacquer lacquer processing (step S14).

In the case of the partial coating, first, an unevenness forming step of forming a convex portion of the frame 21 or the sakai 22 and a concave portion disposed therebetween is provided. After that, the process from the previous step S1 is performed. However, instead of sowing the metal powder 3 on the undercoat lacquer, the metal powder 3 is previously 30 to 50% by volume ratio on the undercoat lacquer.
It is mixed and kneaded well, and then applied to the substrate 1 as an undercoat. The specific gravity relationship between the metal powder 3 and the substrate 1 at this time is the same as in the case described above. However, in order to facilitate mixing, the average particle size of the metal powder 3 is set slightly smaller than that in the case of sowing, and is set to 1 to 100 μm.

At the time of mixing and kneading the metal powder 3, rust soil may be mixed. In addition, when the intermediate coating lacquer films 5 and 6 are not thickened, the metal powder 3 is put into the undercoat lacquer, and after kneading, the metal powder 3 and the rust soil are added to the intermediate coating lacquer in a total of 30 to 50%.
The mixture mixed and kneaded is middle-coated. In addition, when adding rust soil, it is preferable to make the average particle diameter of the metal powder 3 as small as 1 to 10 μm. For the undercoat lacquer, a refined urushi such as a raw urushi or a black urushi is used.

Also in the case of the mixing of the metal powder 3 as described above, the adhesion between the base material 1 and the lacquer film is improved, and the impact resistance is also improved. In addition, when rust soil is added, the intermediate-coated lacquer films 5 and 6 can be thickened, and the entire lacquer film can be increased in volume.

Although the patterns 12 and 13 in FIG. 4 and the square pattern 23 in FIG. 5 are formed by the lacquer technique, these patterns 12, 13 and 23 may be performed by a depositing technique. Conventional gold deposition techniques have the following steps. First, the surface of the lacquer is carved with a sword, and the lacquer is wiped off leaving the lacquer in the groove. After that, dry the surface slowly with a fir paper moistened with a very small amount of seed oil. Next, the surface is wiped off by attaching a gold foil and holding it into the groove. If you put silver foil instead of gold leaf, it is called "silver silver." In this specification, silver and silver are referred to as gold.

Unlike the conventional deposit, the deposit of the present invention uses laser engraving. At the stage where the baking and drying in step S15 is completed, engraving is performed from the surface with a laser to form an engraved portion 31 as shown in FIG.
The engraved portion 31 has a hole or groove shape whose bottom side is wider than its front side. The depth is 20 to
The thickness is about 100 μm, and the metal powder 3 in the undercoat lacquer film 4 is slightly exposed. In addition,
In FIG. 7, the undercoat lacquer film 4 is composed of a lacquer film 4a generated by the first undercoat (step S4) and a lacquer film 4b generated by subsequent repeated undercoat.

A lacquer 32 is imprinted on the engraved portion 31. Thereafter, a metal powder, for example, a gold powder 33 is deposited by a method similar to the conventional method. Thereafter, lacquer lacquer 34 is applied, and finally, sharpening corresponding to gloss polishing (step S17) is performed. As described above, since the deposited metal portion is engaged with the undercoat lacquer film 4a into which the metal powder 3 is mixed, and the bottom of the engraved portion 31 is wide, the deposited metal is not easily peeled. The technique of forming the engraved part 31 by this laser and depositing gold is based on the base material 1
Can be applied to materials other than metal, such as wood and bamboo. When the substrate 1 is made of a material other than metal, it is not always necessary to mix the metal powder 3.

The deposit operation is not a paste of the gold dust 33,
As shown in FIG. 8, it may be performed by plating. In this case, first, as shown in FIG. 8A, after the second baking and drying (step S15), the engraved portion 41 is formed from the surface by laser. The engraved portion 41 is a hole or a groove whose bottom side is wider than its front side. Further, the depth is about 50 to 150 μm, which is a depth to a state where a part of the base material 1 is cut out.

In the example shown in FIG. 8, the second baking and drying is performed immediately after the polishing (step S10) is completed.
After the baking and drying, the base plating portion 42 is provided on the engraving portion 41 by electroplating. Next, the finish plating portion 43 is overlaid on the base plating portion 42 by a similar electroplating process. Finally, gloss processing corresponding to the gloss polishing processing in step S17 is performed. The deposit by this plating brings about the same aesthetic feeling as inlaying (the one in which gold or shellfish is embedded in a groove or a hole).

The depositing technique shown in FIGS. 7 and 8 is particularly preferred when the pattern is very fine. This is because laser engraving can be applied to very fine engravings. The ability to create finer patterns and computer control of the laser position allows for more variety of designs than before. In addition,
The second baking and drying is not essential in the gold deposition technique of FIG. 7, but the second baking and drying is essential in the plating gold deposition technique of FIG.

Each of the above embodiments is an example of a preferred embodiment of the present invention. However, the present invention is not limited to this embodiment, and various modifications can be made without departing from the gist of the present invention. For example, in order to improve the weather resistance, an accessory formed with a lacquer film may be subjected to ion plating in argon gas, in addition to the method of mixing titanium oxide powder. In addition, as the metal substrate 1, a single metal or alloy such as copper, aluminum, stainless steel, and brass can be used in addition to gold and silver. In the case of a copper substrate, the metal powder 3 is preferably copper powder, and in the case of an aluminum substrate, aluminum powder is preferable.

When the base material 1 and the metal powder 3 are not the same material, a material having a specific gravity close to that of the material 1, specifically, a difference of ± 10% from the material 1 is preferable, and a material having a slightly higher specific gravity is used. Is more preferred. The lacquer layer is preferably about 10 to 20 layers, but may be about several layers.

[0075]

According to the method for producing a processed lacquer product of the present invention, the adhesion and impact resistance of the lacquer can be improved by slightly increasing the number of steps. The properties and impact resistance are improved. Moreover, the manufacturing method and accessories of the lacquered product of the other invention can expand the variety of designs. Furthermore, the method for producing a lacquered product according to another invention can improve weather resistance, particularly ultraviolet light resistance,
The manufactured accessories will have excellent weather resistance.

[Brief description of the drawings]

FIG. 1 is a diagram showing manufacturing steps of a method for manufacturing a lacquered product according to an embodiment of the present invention.

FIG. 2 is a diagram showing a surface of a base material after a pretreatment for a base in a method for manufacturing a lacquered product according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a surface of a product manufactured by the method for manufacturing a lacquered product according to the embodiment of the present invention.

4A and 4B are diagrams illustrating an example of a metal accessory manufactured by the manufacturing steps of FIG. 1, wherein FIG. 4A is a diagram illustrating a front surface of a broach as the accessory, and FIG. 4B is a diagram illustrating a back surface of the broach of FIG. .

FIG. 5 is a diagram showing a surface state of an accessory manufactured by a manufacturing method in which a part of the manufacturing steps in FIG. 1 is changed.

FIG. 6 is a partial sectional view taken along line AA of FIG. 5;

7A and 7B are views for explaining a method of depositing metal by laser engraving according to an embodiment of the present invention, wherein FIG. 7A is a cross-sectional view showing a state where an engraved portion is formed by laser, and FIG. It is sectional drawing which shows the state which performed similar deposit.

FIGS. 8A and 8B are views for explaining another method of depositing by laser engraving according to the embodiment of the present invention, wherein FIG. 8A is a cross-sectional view showing a state where an engraved portion is formed by laser, and FIG. FIG. 3 is a cross-sectional view illustrating a state where gold is deposited by plating.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Surface 3 Metal powder 4 Undercoat lacquer film 5, 6 Intermediate lacquer film 7, 8 Finish lacquer film 9 Finished lacquer film

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) B44C 1/22 B44C 1/22 B (72) Inventor Fumio Ogigami 717-3 Sogahiraide, Shiojiri-shi, Nagano Prefecture No. F-term (reference) 3B114 AA02 AA23 BB10 BB12 JA00

Claims (17)

[Claims] An undercoating pretreatment step of making the surface of the metal base material have a roughness of 1 to 50 μm; and an undercoating step of applying lacquer containing pigment as an undercoat lacquer to the surface of the metal base material to a thickness of 10 to 50 μm. A metal powder sowing step of sowing a metal powder of the same material as the metal base material, a precipitation step of drying at a constant temperature to precipitate the metal powder, and a first step of baking and drying at a high temperature of 100 ° C. or more. Baking and drying process, a grinding process for grinding the undercoat lacquer surface, an intermediate coating process for applying the intermediate lacquer, a lacquer process for lacquer lacquer processing, and a gloss processing process for glossing the surface of the lacquer film, A second baking-drying step of baking-drying again at a high temperature of 100 ° C. or more, wherein each of the steps is performed in order. 2. The metal powder has an average particle size of 5 to 150 μm.
The method for producing a lacquered product according to claim 1, wherein a finishing coating step of applying a finishing lacquer is provided after the lacquer work, and a titanium oxide powder is mixed into the intermediate-coated lacquer and the finishing lacquer. 3. A method for producing a lacquered product in which lacquer is applied to the surface of a metal base material, wherein an undercoating step of applying an undercoat lacquer, and after the undercoating step, an average of the same material or a material having a specific gravity close to that of the metal base material. A method for producing a lacquered product, comprising: a step of sowing a metal powder having a particle size of 5 to 150 μm, and a step of precipitating the sowed metal powder. 4. A method for producing a lacquered product in which lacquer is applied to a surface of a metal substrate, wherein a step of forming irregularities on the surface of the metal substrate and a step of depositing metal powder of 1 to 100 μm in the undercoat lacquer. After mixing and kneading, the undercoating step of coating the concave portions of the metal base material, the intermediate coating step of applying the intermediate lacquer to the concave portions, and the lacquer lacquer in the concave portions after the intermediate coating step. And a lacquer processing step of processing. 5. A method of manufacturing a lacquered product in which lacquer is applied to a surface of a metal substrate, wherein a step of forming irregularities on the surface of the metal substrate includes the steps of: ~ 1
After mixing 30 to 50% by volume of a metal powder of 00 μm and kneading, an undercoating step of coating the concave portion of the metal base material, an intermediate coating step of applying an intermediate lacquer to the concave portion, and an intermediate coating step And a lacquer processing step of lacquering the recesses later. 6. The undercoating lacquer according to claim 4, wherein said undercoating lacquer is a refined lacquer such as raw lacquer or black lacquer.
Or the manufacturing method of the lacquer processing article of 5. 7. A method for producing a lacquered product in which lacquer is applied to the surface of a base material, wherein after lacquer coating, laser engraving using a laser is performed to a depth of up to or near a lacquer part mixed with metal powder. A method for producing a lacquered product, comprising: an engraving step to be performed as described below; and a metallizing step of metallizing a metal powder or a metal foil after printing a transparent mark on the engraved portion. 8. A method of manufacturing a lacquered product in which lacquer is applied to the surface of a metal substrate, wherein after lacquering, laser engraving using a laser is performed to the depth of the metal substrate, and thereafter engraving is performed. A plating step of performing plating by electroplating on the set portion. 9. A method for producing a lacquered product in which lacquer is applied to the surface of a base material, wherein titanium oxide powder is added to at least one of the middle-coated lacquer and the finished lacquer when the intermediate lacquer or the finished lacquer is used. A method for producing a lacquered product, wherein 0.1 to 3% is mixed. 10. A method for producing a lacquered product in which lacquer is applied to the surface of a metal substrate, a step of forming an undercoat lacquer film mixed with metal powder, and then baking and drying at a high temperature of 100 ° C. or more. A method of producing a lacquered product, comprising: a first baking drying step to be performed, and a second baking drying step of performing a rebake drying at a high temperature of 90 ° C. or more after a polished finishing process performed thereafter. . 11. The method for producing a lacquered product according to claim 10, wherein the temperature in the second baking and drying step is lower than the temperature in the first baking and drying step. 12. An accessory in which at least an undercoat and an intermediate coat are applied to the surface of a metal substrate, the undercoat lacquer film applied to the surface of the metal substrate has the same material as the metal substrate or a specific gravity of 10%. Lacquer-applied accessories, which are mixed with metal powder of the material that is different from the above. 13. The lacquered accessory according to claim 12, wherein the surface of the metal base material has a roughness of 1 to 50 μm, and the average particle size of the metal powder is 1 to 150 μm. 14. The amount of 30 to 50 in the volume of the undercoat lacquer film
The lacquer-applied accessory according to claim 12 or 13, wherein% is a component of metal powder or metal powder and rust soil, and an average particle size of the metal powder is 1 to 100 µm. 15. An uneven portion is provided on the metal substrate, a lacquer film such as an undercoat lacquer film containing the metal powder is formed in a concave portion, and a lacquer film is not formed on a convex portion. An accessory decorated with the lacquer processing according to claim 12, 13, or 14. 16. An accessory in which at least an undercoat and an intermediate lacquer are applied to the surface of the base material, to the intermediate lacquer film, or to at least one of the intermediate lacquer film or the finish lacquer film when performing the finish coat, Average particle size is 0.1-0.5μ
A lacquer-applied accessory, characterized in that 0.1 to 3% by volume of titanium oxide powder is mixed therein. 17. An accessory in which a lacquer process is applied to the surface of a base material, wherein a groove or a hole in which the diameter on the deep side is larger than the diameter on the shallow side is provided in the depth direction of the lacquer film. A lacquer-applied accessory, in which metal powder or metal foil is deposited or deposited by metal plating.