JP2000255578A - Color-coated bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a large amount of colored resin coated bottles wherein color density is uneven by positively using a color unevenness of the colored coating, at a low cost by forming the resin coating into a two layer coating, and applying the under coating on the total surface by a dipping method, and spraying a resin coating liquid containing a coloring agent on the top of the under coating. SOLUTION: When a resin coating is applied on a glass bottle, after a coating is applied on the total surface of the glass bottle excepting the mouth section by a dipping method, a coating agent containing a coloring agent is coated on the body section of the glass bottle by a spraying method. Or, after coating the coating agent containing the coloring agent on the body section of the glass bottle by the spraying method, the total surface of the glass bottle excepting the mouth section may be coated by the dipping method. Then, the coating agent containing the coloring agent is sprayed in such a manner that a continuous unevenness may be applied from a darker color to a lighter color extending to the top and bottom respective section of the body, and a gradation is applied to the color. Therefore, a large amount of glass bottles having a new design can be provided at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass processing method for coloring a glass bottle by coating the glass bottle with a resin, and a colored coated glass bottle obtained by the method.

[0002]

2. Description of the Related Art For the purpose of coloring a glass bottle, it has been conventionally performed to apply a resin solution containing a colorant to the surface of the glass bottle by a dipping method or a spray method. Further, for the purpose of preventing scattering at the time of rupture, resin layers such as urethane and epoxy are applied in two layers on the surface of glass bottles, and thick resin-coated bottles have also been commercialized.

[0003] However, resin coating on a glass bottle is generally applied to the surface of the glass bottle with a uniform thickness. If the film thickness is uneven, film peeling due to a decrease in the glass adhesive strength of the coating film is caused. In the case of a colored coat, the appearance was poor, such as uneven color, and the product was defective.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a large amount of colored resin coated bottles having different shades of color at a low cost by positively utilizing the color unevenness of the colored coating.

[0005]

Means for Solving the Problems As a result of intensive studies on the above-mentioned problems, the present inventor has found that a resin coat is a two-layer coat, an undercoat is entirely coated by a conventional dipping method, and a spray method is applied thereon. By spraying a resin coating solution containing a colorant on the bottom of the bottle using
The inventors have found that the gradation of the color from the lower part of the bottle toward the upper part of the bottle, that is, the color continuously changes in density from dark to light, achieves the above-mentioned object, and has completed the present invention. In general, when spray painting using a spray gun, the spray pattern can be changed in various ways by adjusting the nozzle opening degree and air pressure of the spray gun, but usually the central part of the spray pattern has a large spray amount. Therefore, it becomes thicker and becomes thinner as the distance from the center of the spray pattern becomes smaller, so that it is applied thinly. In other words, color shading can be achieved. In the case of a normal coating, the shading of the color is uneven spraying, which is not preferable, and the coating is repeated so as to have a uniform thickness. Utilizing this phenomenon in reverse, the inventor focused on a new coloring method for glass bottles. When the resin coat is formed as a two-layer coat, if only a single-layer coat is formed by the spray method, the adhesive strength of the thin film at the upper part of the bottle becomes weak, and the adhesive strength of the film is maintained. Therefore, a two-layer coating was used.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

In the method for producing a colored bottle by resin coating of the present invention, the glass bottle used is washed beforehand with an outer surface to remove foreign substances and dirt adhering to the surface, and after drying the water, it is carried into a resin coating line. . The bottle for coating is moved while holding the mouth with a special holder and rotating it, and at the dipping tank filled with the resin solution for coating, the bottle diagonally with the bottom down and the shoulder up. Immerse in the coating resin solution. The liquid was immersed up to the neck of the bottle, and the liquid was applied to the entire surface of the bottle up to the bottle mouth parting line while rotating. As the coating resin liquid, a water-dispersed urethane resin was used. However, the liquid component is not particularly limited, and the color may be a colorless and transparent clear type or a colored clear type. Further, a white frost-like resin liquid in which a frost agent is mixed or a colored frost-like resin liquid in which a frost agent and a colorant are mixed may be used.

[0008] The applied bottle is pulled up from the liquid,
The liquid adhering extra was dropped while the bottom was turned obliquely while rotating the bottle, and then carried into a drying furnace maintained at 80 ° C. to 120 ° C. where the resin was applied and the surface of the bottle was dried. In this case, it is better for the next colored overcoat that the resin surface has a slight stickiness in the finger touch test for the next colored overcoat, and there is no stickiness and the overcoat liquid repels or adheres when completely dried. become bad. Conversely, if the resin dries poorly and the stickiness is strong, leveling of the overcoat occurs, making it difficult to obtain color gradation.

After drying, the resin liquid mixed with the coloring agent was sprayed toward the barrel of the bottle from obliquely below or obliquely upward using a spray gun. At this time,
The spray gun is placed at right angles to the body of the bottle,
By directing the center of the spray to the lower part of the bottle, a color gradation can be produced from the lower part of the bottle to the upper part of the bottle. At this time, the distance between the bottle and the spray gun is 5
It is set in the range of 0 to 500 mm. If the distance between the bottle and the spray gun is too short, the coloring range will be narrow,
The color becomes too dark, and it is difficult to give a color gradation. On the other hand, if the distance between the bottle and the spray gun is long, the coloring range is widened, and the color is blurred as a whole, and it is difficult to give a color gradation. Then, while spraying the resin liquid with the spray gun, the bottle was rotated at a rotation speed of 0.25 to 6.0 times / second. When the rotation number of the bottle is low, the bottle passes through the spraying area without making one rotation, so that a difference in coloring density occurs in the circumferential direction of the bottle, resulting in spraying unevenness. Further, the rotation speed of the bottle does not need to be 6.0 times / second or more. The surface temperature of the bottle when spraying the resin liquid with a spray gun is 50-100
The temperature range of ° C is appropriate. If the bottle temperature is too low, the coated resin liquid will flow over the bottle surface, causing color unevenness.On the other hand, if the bottle temperature is too high, it will solidify the moment it adheres to the bottle surface, so the surface of the coated bottle will be rough. Is not preferred. Further, if a large number of spray guns are mounted and resin liquids of different colors are respectively supplied to the individual spray guns, a gradation colored bottle having a multicolor pattern can be obtained. The overcoat resin liquid mixed with the colorant is the same as the undercoat resin liquid mixed with the colorant, but an epoxy resin or an acrylic resin having different components may be used.

In addition, spray coating of a resin solution containing a colorant was carried out after applying an undercoat to the entire surface of the bottle. However, after spraying the resin solution containing the colorant directly on the surface of the bottle, a dipping method was applied to the entire surface of the bottle. May be overcoated. In this case, the temperature of the bottle before spray coating needs to be adjusted to a higher temperature of 50 to 80 ° C. If the bottle temperature is low, drying of the resin liquid will be slow, and if the bottle is immersed in the resin liquid that has entered the dipping tank for the next overcoating, the colored resin adhering to the bottle surface will melt from the bottle surface. To contaminate the overcoat resin solution. On the other hand, if the bottle temperature is too high, the spray-coated resin liquid solidifies as soon as it adheres to the bottle surface, so there is no leveling effect on the surface, resulting in a rough coated bottle or foaming. Is not preferred.

The position where the color gradation is applied can be freely selected according to the design of the glass bottle or the user's preference. The dark to light color is applied from the lower part of the glass bottle to the upper part of the glass bottle. In addition to gradation, gradation coloring in the direction from the upper body to the lower body in the opposite direction is also possible by changing the arrangement of the spray gun.

[0012]

(Example 1) The outer surface of a 300 ml colorless bottle of sake was washed with water, and the surface was dried. After that, the mouth of the bottle was gripped by a special holder and carried into a resin coating line. While the mouth of the bottle is being gripped, the bottle is continuously transported through the resin coating line, and when it reaches the dipping tank, the bottle is filled with a resin solution obtained by mixing a water-dispersed urethane resin solution with a white frost-like frost agent. The bottle is immersed in the dipping tank at an oblique angle with the bottom of the bottle down, just as the bottle immerses to the neck of the bottle. The bottle moves while rotating during immersion in the dipping tank. At the time of immersion, the bottle was rotated 5 times to make the resin liquid wet all around the bottle. At the exit of the dipping tank, the bottle is slowly pulled up from the resin dipping tank, and tilted obliquely with the bottom of the bottle down,
Excess liquid adhering was dropped while rotating. After the liquid no longer dripped, the bottle was carried into a drying oven,
The resin solution was dried by heating for 10 minutes. The resin-coated bottle that came out of the drying oven had a bottle temperature of 80 ° C., and a slight stickiness was felt in the touch check. To this resin-coated bottle, add a navy colorant to a resin solution obtained by mixing the previously used water-dispersed urethane resin solution with a white frost-like frosting agent. Spray coating was performed with a spray gun toward the lower part of the bottle from an oblique lower direction. The bottle was rotating during the transfer of the bottle and also during the spray coating, and the bottle was rotated two times or more while hitting the spray liquid, and the spray liquid was applied all around the bottle. After the spray coating, the bottle was again carried into a drying furnace, and heated at 110 ° C. for 10 minutes to dry the resin surface. The surface of the bottle coming out of the drying oven was completely dry without any sticky feeling when checked by touch. The bottle is further transferred to a curing oven where 180
The resin was cured by heating at 15 ° C. for 15 minutes. Coming out of the curing oven, the cooled bottle is placed on a white frosted base,
It was a colored bottle with a dark blue gradation where the lower part of the body was dark and the color faded toward the upper part of the body.

(Example 2) The outer surface of a 500 ml colorless bottle of wine was washed with water, and the surface was dried. The mouth of the bottle was gripped by a special holder and carried into a resin coating line. The bottle is continuously conveyed through the resin coating line while the mouth of the bottle is held. During transportation, the bottle was heated by a far infrared heater so that the surface temperature became 50 to 80 ° C. When the bottle reaches the spray coating device attached in front of the dipping tank, the bottle is a resin solution obtained by adding a pink colorant to a resin solution obtained by mixing a white frost-like frosting agent with a water-dispersed urethane resin solution. Is spray coated. During spray coating, the bottle is moving while rotating. After the spray coating, the resin on the bottle surface was dried with a far-infrared heater, and the resin liquid obtained by mixing the water-dispersed urethane resin liquid with a white frost-like frosting agent was coated in the same manner as in Example 1. After coating, it is transported to a drying oven,
After heating for 1 minute, it was transferred to a curing oven,
The resin was cured by heating for minutes. After coming out of the curing oven, the cooled bottle was a white frost-like pink colored bottle with a dark pink color in the lower part of the body and a pink gradation that faded in color toward the upper part of the body.

[0014]

As is clear from the above description, it was difficult to color the glass bottle with a color gradation by the conventional method. However, the present invention solves the conventional problems, and in terms of glass coloring, a glass bottle having a new design with a color gradation can be provided in a mass-produced manner and at a low cost, and therefore, industrial The contribution to development is extremely large.

[0015]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a colored resin-coated bottle obtained in Example 1 of the present invention.

[0016]

[Explanation of symbols]

Glass bottle An undercoat layer coated on the entire surface of the glass bottle An overcoat layer coated with a resin containing a coloring agent on the bottom of the bottle

Claims (3)

[Claims] In a method for coating a glass bottle with a resin, a coating agent containing a coloring agent is applied to the body of the glass bottle by spraying after coating the entire surface of the glass except for the mouth of the glass bottle by a dipping method. And a glass bottle coated with a resin by this method. 2. A method for coating a glass bottle with a resin, wherein the body of the glass bottle is coated with a coating agent containing a coloring agent by a spraying method, and then the entire surface of the glass except for the mouth of the glass bottle is dipped by a dipping method. And a glass bottle coated with a resin by this method. 3. The method according to claim 1 or 2,
In a resin-coated glass bottle, spray a coating agent containing a colorant from the lower body to the upper body, or from the upper body to the lower body so that the color changes from dark to light continuously. , Colored coat bottles with gradation in color.