Lacquer-like coating and decoration of glass bottles

Abstract

To provide a glass bottle simple in pre-treatment and subjected to lacquer-like coating and decoration by using a simple coating and drying device.SOLUTION: A surface of a glass bottle is wiped with a cloth containing a thinner. A holder of the glass bottle is a magnet detachable type and has an air hole communicating with a T-shape. A mouth of the glass bottle is inserted and fitted onto a silicone rubber plug. A magnet portion is joined to and mounted on a magnetic body at a central part of a taper guide portion by means of a magnetic force. A two-liquid type polyurethane coating material is spray-coated while the glass bottle is suspended and rotated. The coated glass bottle is suspended from a magnetic body rotary hanger of a drying carriage in a magnet detachable manner. The glass bottle is placed in an electric heating dryer at 60°C and dried for 1 hour. A body portion of the glass bottle is makie-decorated with a coating of the two-liquid polyurethane coating material by screen printing, and the glass bottle is naturally dried to obtain a lacquer-like coated and decorated glass bottle.SELECTED DRAWING: Figure 1

Description

Technical Field

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[0001] The present invention relates to a glass bottle painted and decorated in a lacquer tone and a method for manufacturing the same.

Background Art

[0002] Kishu lacquerware has been produced in Kuroe, Nanki City, Wakayama Prefecture since the Muromachi period. The origin is that weavers from Omi migrated to Kuroe and began making astringent bowls (bowls with a base of a mixture of persimmon tannin and charcoal powder) using the abundant wood in Kishu. It is also called Kuroe-nuri from the name of the place. In addition to this, it can be said that another origin of Kishu lacquerware is that the monks at Kongoriji Temple made utensils such as trays, bowls, and basins for temple use by themselves. It is called one of the three major lacquerwares in Japan together with Aizu-nuri (Fukushima Prefecture), Yamanaka-nuri and Wajima-nuri (Ishikawa Prefecture). In Kishu lacquerware, the base is not lacquer but mainly persimmon tannin or glue, and lacquer is applied on the top to finish it, and these were used as utensils for common people's practical use. And it has developed by introducing techniques such as decoration by maki-e and engraving with gold inlay. Although it is an old lacquerware, there are many synthetic lacquerware products in recent years. Synthetic lacquerware is lacquerware that uses plastic instead of wood as a raw material. Also, the use of synthetic paints such as urethane and cashew coating for lacquer is increasing (Non-Patent Document 1).

[0003] In the painting of glass products, usually sandblasting treatment or treatment with a silane coupling agent is performed. The surface of the glassware is sandblasted to form a fine uneven surface and processed into opaque frosted glass, or the surface of the glassware is roughened by hydrofluoric acid treatment and processed into opaque frosted glass. Next, on the processed glassware, a desired pattern is formed by handwriting using a brush, a pen, etc. with a paint obtained by mixing 1 to 5 parts of a silane coupling agent with 100 parts of safflower lacquer or an acrylic resin paint, or a desired pattern is transferred and formed by screen printing by placing a silk screen mold. There has been invented a glass product with lacquer decoration. (Patent Document 1) Sandblasting treatment or hydrofluoric acid treatment is performed as a pretreatment on glass products, and a silane coupling agent is mixed into the paint to enhance the adhesion of the paint to the glass products.

[0004] A bottle painting holder has been invented in which a rotating disc is attached to a hanging hook as an axis, a downward-facing trumpet-shaped fitting made of hard plastic is concentrically attached to the lower surface thereof, a stepped portion is formed on the inner circumferential surface and several notches are provided, and a bottle neck fitting projection is provided on the top surface (Patent Document 2). The bottle neck is placed in a downward-facing trumpet-shaped holder made of hard plastic, and the bottle neck is inserted into the bottle neck fitting projection on the top surface. The bottle is then held in place and painted. However, this process takes time, and because the bottle neck is sealed, there is a risk of the bottle coming loose if the inside of the bottle expands during painting.

[0005] Furthermore, Figure 1 of Patent Document 3 shows an electrostatic powder coating apparatus using a spray gun having an electric motor (1), a bottle rotating device (2), an L-shaped shaft (3), a bottle cap (4), a bottle holder (5), a rod (6), a spring (7), a bottle (8), a center press (23), and a spring (24) (Patent Document 3). In this case, the bottle neck is held by a bottle cap and spring, the tip of the bottle holder is inserted into the bottle mouth and held in place, and the bottle bottom is supported by a spring-loaded center retainer. The bottle is then rotated using a bottle rotating device while electrostatic powder coating is applied with a spray gun. However, this method also takes time to install, and since the bottle mouth is sealed, there is a risk of the bottle coming loose if the inside of the bottle expands during painting.

[0006] A drying apparatus for drying a thermosetting coating applied or printed on the surface of a glass container has been invented (Patent Document 4). This apparatus comprises a horizontally elongated polygonal or cylindrical drying oven body, a substantially polygonal or cylindrical reflective dome arranged along the longitudinal direction, far-infrared lamps arranged along the longitudinal direction within the reflective dome, and a conveyor that supports the glass container to be dried within the irradiation range of the far-infrared lamps and moves it along the longitudinal direction of the drying oven body. This device supports and processes glass containers one by one, but it requires a large installation area and is a drying device for mass production.

[0007] A method for applying a high-strength metallic finish to a glass container has been invented (Patent Document 5). This method involves printing a thermosetting resin ink onto the surface of a glass container to form a thermosetting resin layer with a desired design, heating the thermosetting resin ink to partially cure the thermosetting resin layer, transferring a foil with a pre-layered protective film that hardens with ultraviolet light onto the surface of the partially cured thermosetting resin layer, curing the protective film by irradiating it with ultraviolet light, fully curing the thermosetting resin layer in a drying oven, and then cooling it. The process of applying foil to a semi-cured thermosetting resin layer is complicated, and UV curing requires a lamp device. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 10-194782 [Patent Document 2] Publicly Published Utility Gazette No. 49-9848 [Patent Document 3] Publicly Published Utility Gazette No. 25155 (Showa 52) [Patent Document 4] Japanese Patent Publication No. 2006-176730 [Patent Document 5] Japanese Patent Application Publication No. 11-020299 [Non-patent literature]

[0009] [Non-Patent Document 1] Kishu Lacquerware Cooperative Association Homepage [Overview of the project] [Problems that the invention aims to solve]

[0010] In the painting of glass products, sandblasting or treatment with silane coupling agents is typically performed. Patent Document 1 describes a glass product invented by either sandblasting the surface of a glass vessel to form a fine uneven surface and process it into opaque frosted glass, or by roughening the surface of a glass vessel with hydrogen fluoride to process it into opaque frosted glass, and then applying lacquer decoration to the processed glass vessel by mixing 1 to 5 parts of a silane coupling agent with 100 parts of vermilion lacquer or acrylic resin paint, and then applying the desired pattern by hand using a brush or the like, or by transferring the desired pattern by screen printing using a silk screen stencil. Glass products are pre-treated with sandblasting or hydrogen fluoride, and a silane coupling agent is mixed into the paint to improve the paint's adhesion to the glass. Such pre-treatment is a complicated process, and a simpler pre-treatment method is desirable. Patent Document 2 describes a bottle painting holder that has a rotating disc attached to a hanging hook as an axis, a downward-facing trumpet-shaped fitting made of hard plastic attached concentrically to its lower surface, a stepped portion formed on its inner circumferential surface and several notches provided, and a bottle neck fitting projection provided on the top surface. The bottle neck is placed in a downward-facing trumpet-shaped fitting made of hard plastic, and the bottle neck is inserted into the bottle neck fitting projection on the top surface. The bottle is then held in place and painted. However, this process takes time to attach and detach, and since the bottle neck is sealed, there is a risk of the bottle coming loose if the inside of the bottle expands during painting. Furthermore, Figure 1 of Patent Document 3 shows an electrostatic powder coating apparatus using a spray gun, comprising an electric motor (1), a bottle rotating device (2), an L-shaped shaft (3), a bottle cap (4), a bottle holder (5), a rod (6), a spring (7), a bottle (8), a center presser (23), and a spring (24). In this case, the neck of the bottle is held by the bottle cap and spring, the tip of the bottle holder is inserted into the bottle mouth and held in place, and the bottom of the bottle is supported by a spring-loaded center presser, and electrostatic powder coating is performed with the spray gun while the bottle is rotated by the bottle rotating device. In this case as well, it takes time to attach, and since the bottle mouth is sealed, there is a risk that the bottle may come off if the inside of the bottle expands during coating. Patent Document 4 describes a drying apparatus for drying a thermosetting coating applied or printed on the surface of a glass container. The apparatus comprises a horizontally elongated polygonal or cylindrical drying oven body, a substantially polygonal or cylindrical reflective dome arranged along the longitudinal direction, far-infrared lamps arranged along the longitudinal direction within the reflective dome, and a conveyor that supports the glass container to be dried within the irradiation range of the far-infrared lamps and moves it along the longitudinal direction of the drying oven body. Each glass container is supported and processed individually, but this requires a large installation area and is a drying system for mass production. Patent Document 5 describes a method for applying high-strength metallic decoration to a glass container, which involves printing a thermosetting resin ink onto the surface of a glass container to form a thermosetting resin layer with a desired design, heating the thermosetting resin ink to partially cure the thermosetting resin layer, transferring a foil with a pre-layered protective film that hardens with ultraviolet light onto the surface of the partially cured thermosetting resin layer, curing the protective film by irradiating it with ultraviolet light, fully curing the thermosetting resin layer in a drying oven, and then cooling it. The process of applying foil to a semi-cured thermosetting resin layer is complicated, and UV curing requires a lamp device.

[0011] This invention was made to solve a problem that has existed in the past. Specifically, there is a need for a method and apparatus that does not require a complex pre-treatment process for glass bottles, allows for good adhesion of the paint, allows for easy spray painting while the glass bottle is suspended and rotated in a holder, can be easily dried in a drying device, and then decorated to resemble lacquerware using lacquer art techniques such as maki-e. [Means for solving the problem]

[0012] In the painting and decorating of glass bottles, which consists of a pretreatment process, a painting process, a drying process, and a decoration process, the pretreatment involves wiping the surface of the glass bottle with a cloth soaked in thinner or alcohol. The glass bottle holder consists of a pivot shaft, a tapered guide, a magnet, a joint rod, a cap holder, and a silicone rubber plug. There is an air hole that runs from the center of the cap holder through the center of the upper joint rod and into the side of the joint rod in a T shape. The mouth of the glass bottle is inserted into the silicone rubber plug and fitted together, and the magnet part is made of a non-magnetic tapered gas. This is a glass bottle painting and decoration apparatus that uses a magnetically detachable glass bottle holder, which attaches to a magnetic material in the center of the side section by magnetic force, suspends a glass bottle, and sprays a two-component polyurethane paint made of a polyol compound and an isocyanate compound while the bottle rotates. The joint rod section is angled so that the magnet section can be easily detached from the tapered guide section, and with the lower part of the magnet section still attached, the painted glass bottle is suspended by the magnetic force of the magnet section attached to the rotary hanger of the magnetic material of the drying trolley. For pre-treatment, simply wipe the surface of the glass bottle with a cloth dampened with thinner or alcohol to degrease it. The swivel shaft and tapered guide are located on the frame side, while the magnet, joint rod, cap holder, and silicone rubber plug are part of the handling fixture. The non-magnetic tapered guide below the swivel shaft is trumpet-shaped downwards with a magnetic center. While pulling straight down detaches the magnet, it can be easily detached by tilting the joint rod with the magnet to the side. Similarly, when attaching the tapered guide, its trumpet shape downwards allows it to be easily attached to the magnetic center using magnetic force. There is an air vent that runs from the center of the cap holder, through the center of the upper joint rod, and into the side of the joint rod in a T-shape. This prevents the silicone rubber plug from coming off when air expands inside the glass bottle during spray painting and drying. The silicone rubber plug fits into the mouth of the glass bottle due to its elasticity and friction. Detachment is performed between the tapered guide and the magnet. The silicone rubber plug is subjected to heat during the drying of the painted glass bottle, so it is a consumable item and should be removed from the cap holder and replaced.

[0013] In the painting and decoration of glass bottles consisting of a pretreatment process, a painting process, a drying process, and a decorating process, the substantially cubic trolley used in the drying process consists of four vertically long frames, several horizontal frames, two partition plates that divide the upper and lower parts into three chambers, rotary hangers attached to the upper part of each of the three chambers, balance weights on the lower floor, and vibration damping casters installed at the lower part of the four vertically long frames. The painted glass bottle is hung on the magnetic rotary hanger of the drying trolley by the magnetic force of the magnet part with the magnet part attached to the lower part, and the painted glass bottle is dried in an electric dryer at 60°C for 1 hour using a magnet-detachable drying trolley, which is a drying device for the lacquer-like painting and decoration of glass bottles. Tilt and remove the joint rod with a magnet part from the magnet at the center of the non-magnetic tapered guide under the swivel shaft of the painting booth, and use the joint rod to hang the painted glass bottle on the magnetic rotary hanger of the drying trolley by the magnetic force of the magnet part, and then put this trolley into the dryer. The rotary hanger can rotate and is in the shape of a leaf of a stag beetle, and the painted glass bottle is hung on the protruding part through the magnet part and dried. Polycarbonate plates or the like may be attached to the upper part and the four side surfaces of the trolley. An electric dryer made by National was used. The dryer applies only temperature instead of a hot air type so that dust does not adhere to the painted surface.

[0014] In the painting and decoration of glass bottles consisting of a pretreatment process, a painting process, a drying process, and a decorating process, the body part of the glass bottle is masked with a conical plug or not masked, and the glass bottle is hung on a holder and rotated, and a two-component polyurethane paint of a polyol compound and an isocyanate compound is spray-painted. The painted glass bottle is hung on the magnetic rotary hanger of the drying trolley, dried in an electric dryer at 60°C for 1 hour, then if it was masked, the masking conical plug is removed, and if it was not masked, as it is, screen printing is used to apply a decorative painting with a two-component polyurethane paint and air-dried, which is a glass bottle with lacquer-like painting and decoration.

[0015] The screen printing machine used was a device manufactured by Shin Ei Kogyo Co., Ltd. Paint was placed on the screen, the squeegee was lowered onto the screen, and the screen was automatically moved to the right at a constant speed. The glass bottle was placed horizontally, with its body in contact with the screen. As the screen moved to the right, the glass bottle rotated clockwise and screen printing was performed on the body of the glass bottle. Painting with a spray gun was performed using a two-component polyurethane paint consisting of a polyol compound and an isocyanate compound. The glass bottle was painted with a spray gun, and after drying, a cross-cut test (grid tape) (JIS K5600 Paint General Test Methods 4-6) was conducted for the paint adhesion test. In six classifications, it was Class 0 (none of the grid lines peeled off) and Class 1 (minor peeling of the paint film at the intersections of the cuts, clearly not exceeding 5%) (analysis by the Wakayama Prefectural Industrial Technology Center).

[0016] For painting with a spray gun, an Epicoater UE Wide (two-component polyurethane paint) manufactured by Saito Co., Ltd. was used. It was a two-component polyurethane paint of an alkyd polyol compound (Liquid A) and an isocyanate compound (Liquid B, curing agent). The mixing ratio (weight ratio) of Liquid A to Liquid B was 2:1, and the thinner dilution rate was 50-60% (ratio to Liquid A). The alkyd polyol in Liquid A was 50-55%, and the solvent such as xylene was about 40%. It was applied to a glass plate with a 76μ applicator, dried at room temperature (18-20°C), and measured after 24 hours. The hardness Sword Rocker value was 40, and the scratch hardness (pencil method, JIS K5600-5-4) was 3H. For the weather resistance test, it was painted on an ABS (acrylonitrile-butadiene-styrene copolymer) resin and exposed outdoors for one year with no abnormalities. For the boiling water resistance test, it was painted on a melamine resin bowl, dried at room temperature for one week, and then boiled for 30 minutes with no abnormalities (test by Saito Co., Ltd.). The Food Hygiene Law (Containers and Packaging) test (Ministry of Health and Welfare Notification No. 20) passed. For the elution test, heavy metals were 1 μg / ml or less, the potassium permanganate consumption was 1.5 μg / ml or less, the coloring agent did not elute in water and did not elute in 4% acetic acid. For the material test, cadmium was 2 μg / g or less, and lead was 20 μg / g or less (analysis by the Inspection Center of the Chiba Pharmaceutical Association, Inc.).

[0017] Masking was performed using masking cone plugs (manufactured by Iwata Manufacturing Co., Ltd., part number GKH1772). The cone plugs are made of silicone rubber and, due to their hollow structure, flexibly fit and adhere to the surface of the glass bottle. After masking, the area was painted with a spray gun, and after drying, the masked area was screen printed with maki-e (Japanese lacquerware decoration). In this case, the areas without maki-e are visible depending on the lighting.

[0018] Makie is a decorative technique for lacquerware in which a base design is drawn with a slow-drying paint, and then pigments such as metal powders and colored powders are sprinkled on the paint before it is completely dry to finish the design. The following techniques are named Kasane, which refers to the art of applying maki-e (lacquerware decoration) to glass bottles: Two-layer (painting and maki-e): This technique involves painting the entire glass bottle black or vermilion with a spray gun, and then applying maki-e directly to the glass bottle without using any film or other intermediaries. Die-cut maki-e: This technique involves cutting marking film (adhesive film) into any desired shape, and then applying maki-e. Adhesive maki-e only: This technique involves applying maki-e to pre-formed marking film (adhesive film, available in black and gold). The technique of painting glass bottles is named IROGIRI (color mist). While lacquerware painting involves applying black or vermilion paint to the entire surface, IROGIRI is characterized by its use of gold and other colors in a gradient, resembling mist. The following techniques are used: Painted and pasted (bottle coloring and maki-e labels): After painting with black paint using a spray gun, gold paint, a mixture of silver powder and yellow paint, is sprayed on top for decoration. This IROGIRI is then either die-cut maki-e or pasted (maki-e only). Painted bottles (bottle coloring): The entire surface is sprayed with black or vermilion paint, and gold and other colors are applied in a gradient, resembling mist. Direct maki-e (maki-e on bottles): Maki-e is applied directly to the bottle without using a film or other intermediary. IROGIRI is painted with a spray gun, and after drying, maki-e is applied to the glass bottle using screen printing.

[0019] When printing the maki-e design using screen printing, a two-component polyurethane paint manufactured by Cashew Co., Ltd. was used. The hardener for Art Shin Maki-e manufactured by Cashew Co., Ltd. consists of 64.81% resin (isocyanate compound) and 26.30% solvent such as xylene. The design was allowed to air dry after printing. [Effects of the Invention]

[0020] This method eliminates the need for complex pre-treatment processes such as sandblasting or silane coupling agent treatment of the glass bottle surface. Simply wiping and degreasing with thinner allows for paint adhesion. The glass bottle is easily suspended from a magnetic detachable holder and spray-painted while rotating. The bottle is then placed in a 60°C electric drying device with the magnetic detachable holder still attached to a magnetic rotary hanger on a trolley for one hour of drying. After drying, screen printing is used to apply lacquerware-like decorations, such as maki-e, resulting in a high-quality glass bottle. Painting and drying can be performed with the magnetic detachable holder attached to the glass bottle, making the process simple and time-saving. [Brief explanation of the drawing]

[0021] [Figure 1] A schematic front view of a magnetic detachable holder for glass bottles used in spray painting, and a schematic front view showing the method of detaching the magnetic part. [Figure 2] Schematic perspective view of a magnetic detachable drying trolley for painted glass bottles. [Figure 3] Schematic diagram of a screen printing machine [Figure 4] Front view of a painted and decorated glass bottle [Modes for carrying out the invention]

[0022] Examples of the present invention are shown below. The present invention is not limited to these examples. [Examples]

[0023] In the painting and decorating of a glass bottle (7), which consists of a pretreatment process, a painting process, a drying process, and a decoration process, the pretreatment involves wiping the surface of the glass bottle (7) with a cloth soaked in thinner or alcohol. The holder for the glass bottle (7) consists of a pivot shaft (1), a tapered guide (2), a magnet (3), a joint rod (4), a cap holder (5), and a silicone rubber plug (6). There is an air hole that runs from the center of the cap holder (5) through the center of the upper joint rod (4) and into the side of the joint rod (4) in a T shape. The mouth of the glass bottle (7) is inserted into the silicone rubber plug (6) and fitted together, and the magnet part (3) is demagnetized. This is a glass bottle (7) painting and decoration apparatus that uses a magnetically detachable glass bottle holder, which attaches to a magnetic material in the center of the tapered guide section (2) of a body by magnetic force, and spray-paints a two-component polyurethane paint of a polyol compound and an isocyanate compound while the glass bottle (7) is suspended and rotated, and the joint rod (4) is tilted so that the magnet section (3) can be easily detached from the tapered guide section (2), and with the lower part of the magnet section (3) still attached, the painted glass bottle (7) is suspended by the magnetic force of the magnet section (3) attached to the rotary hanger (9) of a drying trolley.

[0024] For pre-treatment, simply wipe the surface of the glass bottle with a cloth dampened with thinner or alcohol to degrease it. The pivot shaft (1) and tapered guide (2) are located on the frame side, while the magnet (3), joint rod (4), cap holder (5), and silicone rubber plug (6) are handling fixtures. The non-magnetic tapered guide (2) below the pivot shaft (1) is trumpet-shaped downwards and has a magnetic material in the center. While pulling the magnet part (3) straight down requires considerable force to detach, it can be easily detached by tilting the joint rod (4) with the magnet (3) attached to it sideways. Furthermore, the tapered guide (2) is trumpet-shaped downwards, making it easy to attach.

[0025] There is an air vent that runs from the center of the cap holder (5) through the center of the upper joint rod (4) and into the side of the joint rod (4) in a T-shape, so that the air inside the glass bottle does not expand during spray painting and drying and come off the silicone rubber plug (6). The silicone rubber plug (6) fits into the mouth of the glass bottle due to its elasticity and friction. It is attached and detached between the tapered guide (2) and the magnet (3). The silicone rubber plug (6) is also subjected to heat during the drying of the painted glass bottle (7), so it is a consumable item and should be removed from the cap holder (5) and replaced. [Examples]

[0026] In the painting and decorating of glass bottles (7), which consists of a pretreatment process, a painting process, a drying process, and a decoration process, the roughly cubic trolley used in the drying process consists of four vertically long frames (11), several horizontal frames (11), two partition plates (10) that divide the upper and lower parts into three chambers, rotary hangers (9) attached to the top of each of the three chambers, a balance weight (12) on the lower floor, and vibration-damping casters (13) installed on the lower part of the four vertically long frames (11). The painted glass bottles (7) are attached to the magnetic rotary hangers (9) of the drying trolley by the magnetic force of the magnet part (3) with the lower part of the magnet part (3) still attached, and the painted glass bottles (7) are suspended and dried in an electric dryer at 60°C for one hour. This is a drying apparatus for painting and decorating glass bottles (7) with a lacquer-like finish using a magnetic detachable drying trolley.

[0027] The joint rod (4) having a magnet part (3) is tilted and detached from the magnetic material in the center of the non-magnetic tapered guide (2) below the rotating axis (1) of the paint booth. The painted glass bottles (7) are then suspended from the magnetic rotary hanger (9) of the drying trolley by the magnetic force of the magnet part (3), and the trolley is placed into the dryer. The rotary hanger (9) is rotatable and shaped like a Fatsia japonica leaf, and the painted glass bottles (7) are suspended from the protruding part via the magnet part (3) for drying. Polycarbonate sheets or the like may be attached to the top and four sides of the trolley. A National brand electric dryer was used. The dryer uses only heat, not hot air, to prevent dust from adhering to the painted surface. [Examples]

[0028] In the painting and decoration of a glass bottle (7), which consists of a pretreatment process, a painting process, a drying process, and a decoration process, the body of the glass bottle (7) is masked with a conical plug or not, and the glass bottle (7) is suspended from a holder and rotated while being spray-painted with a two-component polyurethane paint made of a polyol compound and an isocyanate compound. The painted glass bottle (7) is then suspended from a magnetic rotary hanger (9) on a drying trolley and dried in an electric dryer at 60°C for 1 hour. After that, if masking was done, the masking is removed, or if not masking was done, the glass bottle (16) is decorated with a lacquer-like finish using a two-component polyurethane paint with screen printing and then air-dried. A screen printing machine manufactured by Shin-ei Kogyo Co., Ltd. was used. Paint was placed on the screen (15), the squeegee (14) was lowered onto the screen (15), and the screen (15) was automatically moved to the right at a constant speed. The glass bottle (7) was placed on its side, with the body and the screen (15) in contact. As the screen (15) moved to the right, the glass bottle (7) rotated to the right, and screen printing was applied to the body of the glass bottle (7). The spray gun coating was performed using a two-component polyurethane paint consisting of a polyol compound and an isocyanate compound. After coating a glass bottle (7) with a spray gun and drying, the adhesion test of the paint was performed using a cross-cut test (grid tape) (JIS K5600 General Test Methods for Paints 4-6). In the six classifications, the results were Class 0 (no peeling at any of the grid lines) and Class 1 (small peeling of the paint film at the intersections of the cuts, clearly not exceeding 5%) (analysis by Wakayama Prefectural Industrial Technology Center). For spray painting, we used Epicoater UE Wide (two-component polyurethane paint) manufactured by Saito Co., Ltd. This is a two-component polyurethane paint consisting of an alkyd polyol compound (component A) and an isocyanate compound (component B, hardener). The mixing ratio (by weight) of components A to B is 2:1, and the thinner dilution ratio is 50-60% (percentage of component A). The coating was applied to a glass plate using a 76μ applicator, dried at room temperature (18-20°C), and measured after 24 hours. The hardness was measured as follows: hardness (Soldorrocker value) 40, scratch hardness (pencil method, JIS K5600-5-4) 3H. Weather resistance test: Applied to ABS (acrylic butadiene styrene copolymer) resin and exposed to the outdoors for one year; no abnormalities observed. Boiling water resistance test: Applied to a melamine resin bowl and boiled for 30 minutes after drying at room temperature for one week; no abnormalities observed (test conducted by Saito Co., Ltd.). Food Sanitation Law (Containers and Packaging) Test (Ministry of Health Notification No. 20): Leaching test, heavy metals 1 μg / ml or less, potassium permanganate consumption 1.5 μg / ml or less, coloring agent water: no leaching, 4% acetic acid: no leaching, material test: cadmium 2 μg / g or less, lead 20 μg / g or less (analysis by Chiba Prefectural Pharmacists Association Testing Center). Masking was performed using masking cone plugs (manufactured by Iwata Manufacturing Co., Ltd., part number GKH1772). The cone plugs are made of silicone rubber and, due to their hollow structure, flexibly fit and adhere to the surface of the glass bottle. After masking, the area was painted with a spray gun, and after drying, the masked area was screen printed with maki-e (Japanese lacquerware decoration). In this case, the areas without maki-e are visible depending on the lighting. Generally, glass bottles are transparent or translucent for inspection purposes. Among translucent glass bottles, there are black bottles (which are actually dark green in color). When a dye mixed with transparent resin is applied to these bottles, they appear black at first glance, but become translucent when light is shone on them. [Examples]

[0029] The following techniques are named Kasane, which refers to the art of applying maki-e (lacquerware decoration) to glass bottles: Two-layer (painting and maki-e): This technique involves painting the entire glass bottle black or vermilion with a spray gun, and then applying maki-e directly to the glass bottle without using any film or other intermediaries. Die-cut maki-e: This technique involves cutting marking film (adhesive film) into any desired shape, and then applying maki-e. Adhesive maki-e only: This technique involves applying maki-e to pre-formed marking film (adhesive film, available in black and gold). These are painted with a spray gun, dried, and then decorated with maki-e (Japanese lacquerware) designs using screen printing. [Examples]

[0030] The technique of painting glass bottles is named IROGIRI (color mist). While lacquerware painting involves applying black or vermilion paint to the entire surface, IROGIRI is characterized by its use of gold and other colors in a gradient, resembling mist. The following techniques are used: Painted and pasted (bottle coloring and maki-e labels): After painting with black paint using a spray gun, gold paint, a mixture of silver powder and yellow paint, is sprayed on top for decoration. This IROGIRI is then either die-cut maki-e or pasted (maki-e only). Painted bottles (bottle coloring): The entire surface is sprayed with black or vermilion paint, and gold and other colors are applied in a gradient, resembling mist. Direct maki-e (maki-e on bottles): Maki-e is applied directly to the bottle without using a film or other intermediary. IROGIRI is painted with a spray gun, and after drying, maki-e is applied to the glass bottle using screen printing. These are painted with a spray gun, dried, and then decorated with maki-e (Japanese lacquerware) designs using screen printing. [Industrial applicability]

[0031] Without requiring complex pretreatment processes such as sandblasting or silane coupling agent treatment of the glass bottle surface, a highly adhesive coating can be achieved simply by wiping and degreasing with thinner. The glass bottle can be easily suspended from a magnetic detachable holder and spray-painted with a two-component polyurethane paint while rotating. The glass bottle can then be placed on a magnetic rotary hanger on a trolley while still suspended from the magnetic detachable holder and dried in a 60°C electric drying device for one hour. After drying, a high-quality glass bottle can be decorated with a lacquerware-like finish using screen printing techniques such as maki-e. Painting and drying can be done while the glass bottle is suspended from the magnetic detachable holder, making the operation simple and time-saving. [Explanation of Symbols]

[0032] 1. Rotation axis 2 Taper Guides 3 Magnets 4 Joint Rods 5 Cap Holder 6. Silicone rubber plug 7 glass bottles 8 air vent holes 9 Rotary Hanger 10 dividers 11 frames 12 balance weights 13 vibration-damping casters 14 squeegee 15 screens 16 Painted and decorated glass bottles

Claims

1. A method for painting a glass bottle in the style of lacquer, comprising a pretreatment step and a painting step, The aforementioned pretreatment step involves wiping the surface of the glass bottle with a cloth soaked in thinner or alcohol. The painting process includes a first component consisting of a pivot shaft fixed to the upper part of the painting apparatus, and a tapered guide fixed to the pivot shaft and having a magnetic material bonding portion in the center. A glass bottle holder comprising a joint rod, a magnet fixed to one end of the joint rod, a cap holder fixed to the other end of the joint rod, and a second component consisting of a silicone rubber plug attached to the cap holder, The first component is fixed to the upper part of the painting apparatus, and the second component is attached to the mouth of the glass bottle by the silicone rubber plug, and the upper part of the magnet is magnetically coupled to the magnetic joint of the first component, thereby enabling coupling with the first component, and the joint rod is angled so that it can be easily detached from the first component. The glass bottle is rotatably and detachably mounted to the painting apparatus, and the joint rod is provided with a glass bottle holder that has a through hole that opens to the inside of the glass bottle at one end through the cap holder, and branches into a T-shape in the middle, with the other end opening to the outside of the glass bottle. The method includes suspending a glass bottle within the coating apparatus and rotating it while spray-coating it with a two-component polyurethane paint consisting of a polyol compound and an isocyanate compound. A method for applying a lacquer-like finish to glass bottles.

2. A glass bottle holder used in the painting process described in Claim 1.

3. A drying step is provided after the pretreatment step and the painting step, The drying process uses a drying trolley that is roughly cubic in shape and comprises several vertically elongated frames, several horizontal frames, two partition plates that divide the upper and lower sections into three chambers, rotary hangers made of magnetic material provided at the top of each of the three chambers, balance weights provided on the lower floor, and vibration-damping casters provided at the bottom of the multiple frames. With the second part, which has been removed from the first part, attached to the mouth of the painted glass bottle, The method for painting a glass bottle in a lacquer-like finish according to claim 1, wherein the magnet portion of the second component is attached to the rotary hanger of the drying trolley, the painted glass bottle is suspended from it, and the bottle is placed in an electric dryer at approximately 60°C and dried for approximately 1 hour.

4. In the painting process, the glass bottle is spray-painted with a two-component polyurethane paint of a polyol compound and an isocyanate compound while the glass bottle is suspended from the holder and rotated, with or without masking the body of the glass bottle with a cone plug. A method for painting a glass bottle in the style of lacquerware according to claim 3, further comprising a decoration step after the drying step, wherein if the masking treatment has been performed, the conical plug is removed, or if the masking treatment has not been performed, the conical plug is decorated with maki-e using a two-component polyurethane paint by screen printing and allowed to air dry.

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