JP2021171459A - container - Google Patents

Abstract

To provide a container that has a thin, antifouling glass layer provided on the container, so that the deterioration of contents is prevented, the weight of the container is reduced, and the antifouling performance is increased.SOLUTION: In one embodiment, a container has a glass layer with a thickness of 10 μm or less that is provided on a surface of a bottomed, cylindrical container with an open top. In other embodiments, the glass layer has hydrophilicity; the glass layer is provided at least on the inner surface of the container and the upper portion of the outer surface; or the glass layer has a surface roughness Ra of 0.6-2.SELECTED DRAWING: Figure 4

Description

The present invention relates to a portable container for containing a beverage such as tea or coffee.

Recently, single or vacuum double containers with a vacuum between the inner and outer cylinders are widely available as beverage containers, for example, beverage containers for carrying beverages such as tea, coffee and soup.

The beverage container is made of resin or metal, has a tumbler shape without a lid, has a tubular shape with almost the same diameter over the entire height direction, and has a lid and a spout that can be detachably provided by a screw at the upper opening. A water bottle-shaped soup that is relatively low in height and has a wide opening at the top with its sides widening upwards, and contains relatively low-fluidity ingredients or beverages such as soup containing ingredients. There are various types such as a cup-shaped one and a pot-shaped one with a large opening diameter with respect to the height.

And, the conventional beverage container is subjected to various surface treatments in order to improve the cleanliness and appearance. One of them is known as electropolishing treatment. This electrolytic polishing treatment is a treatment in which a DC current is applied with the container side positive in the electrolytic polishing liquid corresponding to the metal container to melt the surface of the container to smooth and gloss it, and to make the surface of the container smooth and glossy. By applying this treatment, the cleanliness of the container is improved and the appearance is improved.

Fluorine coating is known as another surface treatment for improving cleanliness and appearance. This fluorine coating treatment is a treatment using, for example, polytetrafluoroethylene (PTFE), that is, a surface treatment agent having high water and oil repellency, and by applying a fluorine coating to the surface of the container, the cleanliness of the container and the cleanliness of the container can be improved. It looks better.

Enamel treatment is known as another surface treatment for improving cleanliness and appearance. In this hollow treatment, for example, a glaze composed of frit (powdered glass), clay (such as slabs) and water is applied to the surface of the container and fired at about 800 degrees, and the surface of the container is relatively 50 to 100 μm. A process to form a thick "mixed layer consisting of glass and clay (mixed layer in which frit is dissolved on a porous clay layer)", and by applying this process to the surface of the container, the cleanliness of the container And enhances the appearance (see Patent Document 1).

By the way, in the above-mentioned conventional electrolytic polishing treatment, since the surface remains a metal surface even after the treatment, for example, when it is used for a long time, a stain component easily adheres to the surface, resulting in poor hygiene and appearance. Furthermore, when a beverage is placed in a container, metal ions and the like are eluted, which may deteriorate the taste and flavor of the beverage inside.

Further, in the electrolytic polishing treatment, the surface roughness Ra (arithmetic mean roughness) can be reduced by lengthening the electrolytic polishing treatment time. However, for example, coffee, tea, soup, etc. have a lot of deposits that are stain components, so if you put a beverage such as coffee, tea, soup, etc. in a container with a small surface roughness Ra, it will inevitably be a container. Dirt components will accumulate on the inner surface of the coffee. Then, once the dirt has adhered, it is difficult to remove it, it is difficult to clean it, and the hygiene and appearance are deteriorated.

Further, in the electrolytic polishing treatment, if the electrolytic polishing treatment time is lengthened in order to reduce the surface roughness Ra, the production cost rises accordingly, and the amount of the electrolytic polishing treatment liquid used increases, resulting in a waste liquid treatment cost. After all, the production cost soars.

Further, considering that the treatment agent used in the conventional fluorine coating treatment is a substance having a high environmental load and that the place where the fluorine coating treatment is applied is a place where the beverage comes into contact, it is preferable to avoid it as much as possible. ..

Further, in the above-mentioned conventional enamel treatment, a mixed layer made of relatively thick glass and clay having a thickness of about 50 to 100 μm is formed on the surface of the container. Therefore, the mixed layer is difficult to follow the deformation of the container, has a risk of cracking due to an impact due to dropping of the container, and has a drawback that the entire container becomes heavy due to the thick film thickness.

Japanese Patent No. 6459609

The present invention provides a thin and highly antifouling glass layer on the surface of the container to suppress deterioration of the contents, reduce the weight of the container, and provide a highly antifouling container. The purpose.

In order to achieve the above object, the present invention adopts the following configuration.

In the present invention, it is a bottomed cylindrical container having an opening at the upper side, and the container has a structure having a glass layer having a film thickness of 10 μm or less on the surface. In the present invention, as described later, a polymer compound such as polysilazane is calcined to be vitrified by a condensation polymerization reaction and an oxidation reaction, and an ultrathin glass layer (that is, glass such as enamel treatment) is formed on the surface of the container. It is not a mixed layer composed of polysilazane and clay.) It is possible to form a glass layer on the surface of the container, which is much thinner than the conventional enamel-treated mixed film. .. The lower limit of the film thickness is other than zero.

In the present invention, the surface of the container is coated with an ultra-thin glass layer in this way, and the glass layer suppresses deterioration of the contents due to elution of metal ions, etc., and the glass layer follows the deformation of the container. It becomes easier and less likely to crack. As a result, slimness and weight reduction are achieved while ensuring cleanliness, and safety and high quality, for example, scratch resistance, heat resistance, corrosion resistance, or gas barrier property are enhanced. The "surface" may be the entire surface or a part of the surface of the container (for example, the entire inner surface of the container or the surface in contact with the contents of the inner surface of the container), and the "glass layer" may be hydrophilic or hydrophilic. It may be hydrophobic, colorless or colored, transparent or opaque, or a combination thereof.

Further, in the present invention, the glass layer preferably has a hydrophilic structure. By making the glass layer on the surface of the container hydrophilic, the stain components caused by the beverage can easily flow with water, the adhesion of the stain components to the container surface is reduced, and the antifouling property is further enhanced.

Further, in the present invention, it is preferable that the glass layer is provided at least on the inner surface and the upper part of the outer surface of the container. In this way, at least the glass layer forms an ultrathin glass layer on the inner surface of the container and the upper part of the outer surface of the container (for example, the spout portion where the user's mouth hits, or the spout portion and a portion slightly below it). This reduces discomfort due to the metallic odor and metallic tactile sensation when the user touches the mouthpiece, especially in the upper part of the outer surface of the container.

Further, in the present invention, the glass layer preferably has a surface roughness of Ra = 0.6 or more and 2 or less (that is, 0.6 to 2). In particular, the present invention sets the lower limit of the surface roughness Ra to 0.6, and with this configuration, the surface roughness Ra already produced by the applicant is 0.55 (FIG. 9). Compared with the electrolytic polishing product), the electrolytic polishing treatment time can be shortened, and the amount of the electrolytic polishing treatment liquid used can be reduced. As a result, production costs are reduced.

By the way, when the surface roughness Ra of the glass layer is 0.6 or more and 2 or less, it means that a large number of fine irregularities are present on the surface of the glass layer, and the dirt component is the apex of the fine convex portion. Will adhere to. Therefore, the dirt component can be easily removed by washing with a small amount of water or light brushing. Regarding the upper limit, when the surface roughness Ra becomes more than a predetermined value, the stain component will adhere not only to the top of the convex portion but also to the valley portion, and it is considered that the antifouling property is lowered. Considering that there is a container having a surface roughness Ra of about 2, 2 is preferable.

Further, in the present invention, the container is a vacuum double container made of stainless steel in which an exhaust port for forming a vacuum is sealed with a brazing material, and the firing temperature for forming the glass layer is the same as that of the brazing material. A configuration lower than the melting temperature is preferable. With such a configuration, the glass layer can be formed while maintaining the degree of vacuum of the container.

In the present invention, it is preferable to further provide a heat insulating layer between the container and the glass layer having a heat conduction lower than that of the base material of the container. With this configuration, for example, when a high-temperature content is put in a container, the temperature of the content drops more slowly (that is, the heat retention effect is improved), and it becomes easy to hold the container directly with bare hands. ..

Further, in the present invention, it is preferable that the heat insulating layer has a colored structure. Since the glass layer is extremely thin, even if the glass layer is colored in a color preferred by the user, it can be seen through to the human eye, that is, the color of the base material under the glass layer rather than the color of the glass layer ( In this case, the silver color of the stainless steel of the stainless steel bottle 1 becomes visible and the user cannot recognize the original color (that is, the color of the glass layer). However, the configuration allows the user to change the original color of the container. You will definitely be able to recognize it.

INDUSTRIAL APPLICABILITY According to the present invention, deterioration of the contents due to elution of metal ions or the like can be suppressed, and the glass layer can be made to follow the deformation of the container to be hard to break. In addition, slimming and weight reduction can be achieved while ensuring cleanliness and appearance. Further, by imparting hydrophilicity to the glass layer or setting the glass layer to Ra having a roughness within a predetermined range, it is possible to prevent adhesion of dirt components, improve waterproofness, and reduce production costs. be able to. Further, in a vacuum double container in which an exhaust port for forming a vacuum is sealed with a brazing material, a glass layer can be provided while maintaining the degree of vacuum of the container. Further, by providing a colored heat insulating layer between the container and the glass layer, the heat retaining effect of the contents in the container can be further improved, and the color of the heat insulating layer is more reliably recognized as the color of the container. be able to.

Overall view of the vacuum double stainless steel bottle of the present invention FIG. 1 is a cross-sectional view taken along the line AA. Enlarged view of part A in FIG. Enlarged view of part B in FIG. Another enlarged view of part A in FIG. Schematic flow chart of the glass layer forming process Schematic flow chart of ceramic layer + glass layer forming process Related diagrams such as various droplets and contact angles Dirt comparison diagram between various surface roughness Ra and various beverages

The container of the present invention may be a single container or a vacuum double container with a vacuum between them. Also, the type may be bottle-shaped, water bottle-shaped, soup cup-shaped, pot-shaped, or any other shape, and the material may be metal (that is, stainless steel, aluminum, iron, copper, etc.) and It may be made of resin or the like.

In the following, a metal vacuum double stainless steel bottle will be used. 1 and 2 show the overall shape and cross-sectional shape of the vacuum double stainless steel bottle, and FIGS. 3 to 5 show enlarged views of parts A and B of FIG. 2 in which the glass layer is clearly shown. The film thickness of the glass layers in FIGS. 3 to 5 is shown enlarged from the others for easy understanding. Further, the lid member is omitted.

The stainless steel bottle 1 shown in FIGS. 1 and 2 (corresponding to the container of the present invention or the vacuum double container) has a stainless steel bottomed cylindrical outer cylinder 2 and a stainless steel bottomed cylinder that is one size smaller than the outer cylinder 2. It has a shaped inner cylinder 10.

The outer cylinder 2 has an outer cylinder main body portion 3 and an outer cylinder bottom portion 4. The outer cylinder main body 3 is a tubular member having an upper opening 3a that opens upward at the upper end thereof and a lower opening 3b that opens downward at the lower end thereof.

Further, the outer cylinder bottom portion 4 is a container-shaped member having a shallow bottom having an upper opening 4a that opens upward at the upper end thereof, and the inner diameter thereof is substantially the same as the inner diameter of the outer cylinder main body portion 3. Further, a vacuum exhaust port 5 (corresponding to the exhaust port of the present invention) for evacuating the internal space 15 is provided in the central portion of the outer cylinder bottom portion 4, and further, the inner bottom surface of the outer cylinder bottom portion 4 is inside. The getter 7 is provided in a form located in the space 15, and adsorbs a gas such as press oil generated in the internal space 15.

Then, the lower opening 3b of the outer cylinder main body 3 and the upper opening 4a of the outer cylinder bottom 4 are integrated by welding to form the outer cylinder 2. There are various welding temperatures for stainless steel, but as an example, one with a temperature of a thousand and several hundred degrees is known, and welding is performed at a high temperature within this range. Further, the outer cylinder main body portion 3 and the outer cylinder bottom portion 4 may be integrally formed by using, for example, a press, if possible.

The inner cylinder 10 is a member one size smaller than the outer cylinder 2, and has an inner cylinder main body portion 11 and an inner cylinder bottom portion 12. The inner cylinder main body 11 is a tubular member having an upper opening 11a that opens upward at its upper end and a lower opening 11b that opens downward at its lower end.

Further, the inner cylinder bottom portion 12 is a container-shaped member having a shallow bottom having an upper opening 12a that opens upward at the upper end thereof, and the inner diameter thereof is substantially the same as the inner diameter of the inner cylinder main body portion 11.

Then, the lower opening 11b of the inner cylinder main body 11 and the upper opening 12a of the inner cylinder bottom 12 are integrated by welding in the same manner as the outer cylinder 2 to form the inner cylinder 10. As with the outer cylinder 2, the inner cylinder main body 11 and the inner cylinder bottom 12 may be integrally formed by using a press or the like.

Further, the inner cylinder main body 11 has a female screw 11c slightly below the upper opening 11a and a ring-shaped throttle portion 11d protruding inward slightly below the female screw 11c. Then, a male screw of a lid member (not shown) is screwed into the female screw 11c, and a packing of the lid member (not shown) is in contact with the throttle portion 11d. Prevent leaks.

The inner cylinder 10 is housed and arranged in the outer cylinder 2. When the inner cylinder 10 is housed and arranged in the outer cylinder 2, an internal space 15 is formed between the outer cylinder 2 and the inner cylinder 10, and the upper opening 3a of the outer cylinder main body 3 and the inner cylinder main body portion 3a. Since the contact portion is in contact with the upper opening 11a of 11, the contact portion is integrated by welding to form a stainless steel bottle 1.

For the outer cylinder 2 and the inner cylinder 10 of the stainless steel bottle 1, for example, a 300 series stainless steel material such as SUS304 can be used. In addition to the 300 series stainless steel plate such as SUS304, other stainless steel plates, titanium, aluminum, alloys thereof, and the like can be used.

Then, the plate thickness is selected as thin as possible for weight reduction. As the plate thickness of the stainless steel bottle 1, for example, an outer cylinder 2 having a thickness of 0.3 mm to 0.4 mm and an inner cylinder having a thickness of 0.08 mm to 0.3 mm can be used. The plate thickness of the outer cylinder 2 and the inner cylinder 10 may be the same (for example, 0.3 mm to 0.4 mm).

An example of manufacturing the stainless steel bottle 1 of the present embodiment will be described. The plate material for the outer cylinder 2 and the plate material for the inner cylinder 10 are cut to a predetermined length, bent into a cylindrical shape with a press or the like, and the ends are welded and joined. Next, the tubular member is inflated to a predetermined diameter, and the tubular member is stretched to a predetermined length to produce the outer cylinder main body 3 and the inner cylinder main body 11. Further, the outer cylinder bottom portion 4 and the inner cylinder bottom portion 12 are manufactured by cutting a plate material into a disk shape with a press and deforming it into a container shape, for example.

After that, the lower opening 3b of the outer cylinder main body 3 and the upper opening 4a of the outer cylinder bottom 4 are joined by welding to form the outer cylinder 2, and the lower opening 11b of the inner cylinder main body 11 and the inner cylinder bottom 12 are formed. The upper opening 12a is joined by welding to prepare the inner cylinder 10.

After that, the inner cylinder 10 is housed in the outer cylinder 2, and the upper opening 3a of the outer cylinder 2 and the upper opening 11a of the inner cylinder 10 are joined by welding to prepare a stainless steel bottle 1.

After that, the air in the internal space 15 is sucked out from the vacuum exhaust port 5 by the vacuum device to bring the internal space 15 to a predetermined degree of vacuum. Then, a brazing material 6 (for example, glass) (corresponding to the brazing material of the present invention) is placed in the vacuum exhaust port 5, and the brazing material 6 is melted and sealed at a predetermined temperature (for example, about 400 ° C. to 600 ° C.). do.

The degree of vacuum of the internal space 15 is a degree of vacuum capable of effectively keeping the beverage in the inner cylinder 10 warm, for example, ^{preferably on the order of 10 2} Pa or less, and more preferably 10 ^-1 Pa or less. That is, the vacuum double-walled stainless steel bottle 1 has a much higher heat insulating effect than the conventional heat insulating materials such as glass fiber and styrofoam.

Further, the outer surface of the outer cylinder 2 of the stainless steel bottle 1 may be used as a stainless steel surface, may be colored, or may be provided with a design of a popular character.

The inner surface of the inner cylinder 10 of the stainless steel bottle 1 (corresponding to the inner surface of the container of the present invention) and the upper part of the outer surface of the outer cylinder 2 (the range shown by R in FIG. A glass layer 20 is provided on a portion) (corresponding to the upper part of the outer surface of the container of the present invention). The region R in FIG. 2 is, for example, a region covered by the lid member when the upper opening of the stainless steel bottle 1 is closed by a lid member (not shown).

The region of the inner surface of the inner cylinder 10 provided with the glass layer 20 will be described as the entire inner surface in the present embodiment, but a part, for example, a region below the squeezed portion 11d in which the beverage is substantially contained (that is, the region). , At least the area where the beverage is placed and in contact with the beverage). Further, the outer cylinder 2 provided with the glass layer 20 may be a partial outer surface or an all outer surface.

One of the reasons why the glass layer 20 is provided on the upper part of the outer surface of the stainless steel bottle 1 is that the upper part of the outer surface is a portion that the user touches and is required to be clean. Another reason is that the part other than the upper part of the outer surface is also a part to be colored or to add a design of a popular character, and when a part other than the upper part of the outer surface is to be colored or a popular character is attached, the glass layer 20 Is unnecessary. Further, another reason is that if the glass layer 20 is not provided in a portion other than the upper portion of the outer surface, the production cost is reduced by that amount.

For the glass layer 20, for example, polysilazane, which is a polymer compound, is _{dissolved in a solvent composed of dibutyl ether (C 8} H ₁₈ O) to form a paint, and the paint is applied to the surface of a stainless steel bottle 1 which is a container to have a predetermined thickness. Bake it. When the paint is fired, a condensation polymerization reaction and an oxidation reaction are carried out to form a dense and thin glass layer 20 (for example, 1 μm) on the surface of the stainless steel bottle 1. Its thinness is a nanoglass layer that can be called ultra-thin.

As the polysilazane, inorganic polysilazane (perhydropolysilazane: PHPS) and organic polysilazane (organopolysilazane: OPSZ) are known, and both can be used.

Inorganic polysilazane is an inorganic silicon polymer compound mainly composed of silicon molecules. The precursor, which is a raw material, has a hydrogen group as a terminal group, and when fired, the terminal group is replaced with a hydroxyl group (OH group).

A hydroxyl group (OH group) is a form in which hydrogen is bonded to one hand of two oxygens, but this state is an unstable state. So, in the presence of water, the other hand of oxygen attempts to bind and stabilize the hydrogen in the water. That is, the glass layer 20 to be formed has hydrophilicity by itself, and an example of the reaction formula is expressed as, for example, (SiH ₂ NH) + 2H ₂ O = (SiO ₂ ) + NH ₃ + 2H _2. ..

Then, in the embodiment, the glass layer 20 is formed by using this inorganic polysilazane, and the formed glass layer 20 has a contact angle with water of 78 degrees, but a smaller contact angle may be used.

The organic polysilazane, an organosilicon polymer compound of silicon molecules mainly, the precursor is a material having a methyl group (CH ₃₎ as a terminal group, after baking also end groups are methyl groups (CH ₃₎ Remains.

The methyl group (CH ₃ ) is a stable compound as it is, has a weak bond with water, and has water repellency or hydrophobicity that repels water. That is, the glass layer 20 formed of the organic polysilazane has water repellency by itself.

The glass layer 20 formed of the organic polysilazane as described above has water repellency or hydrophobicity and can be used as such, but imparts hydrophilicity to the glass layer 20 formed of the organic polysilazane. It may be treated to have hydrophilicity.

The hydrophilicity-imparting treatment is performed using a hydrophilicity-imparting agent. As the hydrophilicity-imparting agent, for example, various substances such as potassium dichromate dissolved in concentrated sulfuric acid, hydrogen fluoride water, and alkaline hydroxide aqueous solution can be used.

In the hydrophilicity-imparting treatment, for example, a hydrophilicity-imparting agent is applied to the surface of a container (for example, a stainless steel bottle 1) on which a glass layer 20 is formed, and the hydrophilicity-imparting agent is held at normal temperature and pressure or in a heating atmosphere for several seconds to several tens of minutes. Do by. For example, when a 0.2% hydrogen fluoride aqueous solution is used, this solution is applied to the glass layer 20 and held for about 30 seconds to 1 minute.

When inorganic polysilazane is used as a raw material for the glass layer 20, a hydrophilic glass layer can be obtained, so that the hydrophilicity-imparting treatment is not necessary, but the hydrophilicity-imparting treatment is performed to further enhance the hydrophilic function, that is, , The contact angle with water may be smaller.

Further, as the material of the glass layer 20, in addition to the above polysilazane, for example, dialkoxy polysiloxane _{[((RO) 2 SiO)} n], polysiloxanes such as dialkyl polysiloxane _{[(R 2 SiO 2) n} ], or A combination of polysilazane and polysiloxane can be used.

By the way, "Super Water Repellent and Super Hydrophilicity: Its Mechanism and Application Kaoru Tsujii Publisher: Yoneda Publishing Publisher: Sangyo Tosho Co., Ltd. 2nd Edition: May 31, 2011", "Section 1 Wenzel's Theory (p. 36)" ) ”,“ Wenzel's theory applies when the solid surface has a fine concavo-convex structure and the liquid placed on it comes into complete contact with the solid surface. The condition is naturally satisfied when the contact angle is smaller than 90 degrees and gets wet "(hereinafter referred to as" Wenzel's theory "), and the contact angle of water on a plane is 90 degrees or more. The property in the case of is called water repellency, and the property in the case of 90 degrees or less is called hydrophilic (see "Relationship diagram between various droplets and contact angle" in FIG. 8).

The fact that the surface has hydrophilicity means that the dirt components adhering to the surface are in a state where it can easily flow due to water. Even if the dirt component adheres to the surface of the stainless steel bottle 1, the dirt component can be easily removed by a simple operation of sprinkling water. Moreover, even a stubborn dirt component can be easily removed by light brushing while sprinkling water.

Next, an example of a method for forming the glass layer 20 using inorganic polysilazane (PHPS) will be described based on the schematic flow chart of the glass layer forming step of FIG. As a container, a stainless steel bottle 1 having a capacity of, for example, 300 cc to 350 cc is used. Further, the portions forming the glass layer 20 are the inner surface of the stainless steel bottle 1 and the upper portion of the outer surface (that is, at least the drinking spout portion where the user's mouth touches), but the outer surface may be the entire outer surface.

First, in order to remove the solvent adhering to the base material forming the container, the base material is alkaline-cleaned (see S1), and then the paint is applied (see S2). The paint is obtained by dissolving inorganic polysilazane (PHPS) in a _{solvent composed of dibutyl ether (C 8} H ₁₈ O), and the ratio of inorganic polysilazane to dibutyl ether is, for example, (5 to 25) :( 75 to 95). ) Can be used.

A predetermined amount of paint (for example, 1 g) is dropped into the inner cylinder 10 of the stainless steel bottle 1 so as to have a predetermined film thickness (for example, 1 μm) after firing, and the upper part of the outer surface of the outer cylinder 2 of the stainless steel bottle 1 is applied. , Paint with a brush, or turn the stainless steel bottle 1 upside down and immerse it in the paint.

After that, the stainless steel bottle 1 is placed on a dedicated rotating machine and rotated for 20 seconds to 30 seconds, for example, about 10 to 15 times per minute to spread the adhered paint to a uniform predetermined thickness. Since the amount of paint with respect to the film thickness changes according to the area of the upper part of the inner surface and the outer surface of the inner cylinder 10 of the stainless steel bottle 1, for example, the amount of paint, the rotation speed of the rotating machine, and the rotation time are changed and confirmed in advance. I will keep it.

In this case, the viscosity of the paint is as low as that of water. Therefore, the coating film does not require a dedicated coating gun used for fluorine coating, and can be performed by, for example, simpler depping, and the production cost can be reduced accordingly. Then, the paint is dried after painting (see S3).

Then, the stainless steel bottle 1 is fired (see S4). When the stainless steel bottle 1 is fired, a condensation polymerization reaction and an oxidation reaction are carried out on the paint to form a glass layer 20 on the surface of the stainless steel bottle 1. The glass layer to be produced is colorless or colorless and transparent.

The firing is performed, for example, at a furnace temperature of 300 ° C. for about 15 to 20 minutes. When firing is performed, the inner surface temperature of the stainless steel bottle 1 rises to about 250 ° C., and the paint on the inner surface of the inner cylinder 10 and the paint on the upper part of the outer surface of the outer cylinder 2 are ultra-thin (for example, 1 μm) glass layers. It becomes 20. The firing temperature is lower than the melting temperature (about 400 ° C. to 600 ° C.) of the brazing material 6 that seals the internal space 15 of the stainless steel bottle 1.

The above paint will be vitrified even at room temperature over time. That is, if it is left at room temperature for about 3 weeks, it will be vitrified. Therefore, when the material of the container is a resin or the like that is sensitive to high temperatures, such a manufacturing method at room temperature is used. However, in the production method at room temperature, since the curing conditions are not constant, firing at a temperature below the temperature at which the resin melts, for example, firing at about 50 ° C. is preferable.

Further, in the above manufacturing method, the film thickness of the glass layer 20 is set to 1 μm, but it may be 10 μm or less, and more preferably 5 μm or less. By making the film thickness of the glass layer as thin as possible in this way, the glass layer can easily follow changes in the container, and the glass layer 20 is less likely to break. In addition, the thinner the paint, the smaller the amount of paint used, and the lower the production cost. The film thickness of 1 μm or more can be produced, for example, by repeating the above production method a plurality of times.

The present inventor can reduce the dirt on the container by forming the dense and ultrathin glass layer 20 on the surface of the container, and further reduce the dirt on the container by imparting hydrophilicity to the glass layer 20. By setting the surface roughness Ra of the glass layer 20 within a predetermined range, stains can be removed without making the surface roughness Ra of the container (which is also the surface roughness Ra of the glass layer) smaller than necessary. We have found that it is to be reduced. This point will be described later.

By the way, the surface roughness Ra (arithmetic mean roughness) of the base material (that is, the outer cylinder 2 and the inner cylinder 10) of the stainless steel bottle 1 is various, for example, about 1 to 2. Further, the roughness Ra of the surface of the base material can be made smaller Ra by, for example, the above-mentioned electropolishing treatment before forming the glass layer 20. The applicant has already produced a product having Ra = 0.55 (electropolishing treatment time is about 100 seconds) by electropolishing.

After forming the glass layer 20, it is impossible to reduce the roughness Ra of the glass layer 20 by electrolytic polishing treatment. Therefore, the roughness Ra of the surface of the base material is made to a predetermined roughness in advance by the electrolytic polishing treatment, and then the glass layer 20 is formed. The present inventor compared the surface roughness Ra of the base material with the surface roughness Ra after the formation of the glass layer 20 (that is, the surface roughness Ra of the glass layer). The layer was slightly smaller.

Then, it was confirmed by experiments that the dirt was reduced by forming the glass layer 20. The experiment was carried out with the following conditions set for the following beverages. The result is shown in FIG.

Beverages include coffee, tea, sports drink Pocari Sweat (registered trademark, the description of the registered trademark is omitted below), powdered soup onion soup, and powdered soup corn. There are 5 types of soup.

The condition for coffee is "Make coffee by dissolving instant coffee powder in hot water. After that, put about half of the coffee in the inner cylinder 10 of the stainless steel bottle 1, leave it horizontally for several hours, and then wash it with water. However, the coffee is replaced again. However, the leaving time is unified so that there is no difference between the samples. This is repeated 20 times in the horizontal position at the same position, and the surfaces of the inner cylinder 10 of the 10th and 20th times are repeated. Observe. "

The conditions for tea are "dissolve the tea pack in hot water and stir to make tea. After that, put about half of the tea in the inner cylinder 10 of the stainless steel bottle 1, leave it horizontally for several hours, and then wash it with water. However, the tea is replaced again. However, the leaving time is unified so that there is no difference between the samples. This is repeated 20 times in the horizontal position at the same position, and the surface of the inner cylinder 10 of the 10th and 20th times is repeated. Observe. "

The conditions for Pocari Sweat are as follows: "Prepare a test solution for Pocari Sweat. After that, put about half of the test solution in the inner cylinder 10 of the stainless steel bottle 1, leave it in a horizontal position for one day, discard the test solution, and test again. The liquids are replaced. This is repeated for 30 days in a horizontal position at the same position, and the surface of the inner cylinder 10 on the 25th day (25th time) and the 30th day (30th time) is observed. "

The condition for corn soup is "to prepare a test solution for corn soup. After that, put about half of the test solution in the inner cylinder 10 of the stainless steel bottle 1, leave it in a horizontal state for one day, and then discard the test solution. The test solution is replaced again. This is repeated for 25 days in a horizontal position at the same position, and the surface of the inner cylinder 10 on the 20th day (20th time) and the 25th day (25th time) is observed. " ..

The condition for onion soup is "Prepare a test solution for onion soup. After that, put about half of the test solution in the inner cylinder 10 of the stainless steel bottle 1, leave it in a horizontal state for a day, and then discard the test solution. The test solution is replaced again. This is repeated for 25 days in a horizontal position at the same position, and the surface of the inner cylinder 10 on the 20th day (20th time) and the 25th day (25th time) is observed. " ..

The stainless glass bottle 1, which is a container, has no surface treatment on its surface (hereinafter referred to as an untreated product, which corresponds to the untreated product in FIG. 9) and a surface subjected to electrolytic polishing treatment for 100 seconds. (Hereinafter referred to as an electrolytic polishing 100S product, which corresponds to the electrolytic polishing 100S in FIG. 9) and a product in which a glass layer 20 is formed on a product on which no surface treatment is applied (hereinafter, (untreated + glass layer)). A product, which corresponds to the untreated + glass layer of FIG. 9, and a glass layer 20 formed after the surface is subjected to electrolytic polishing treatment for 50 seconds to smooth the surface (hereinafter, (electropolishing 50S + glass layer). ) Product, which corresponds to the electrolytic polishing 50S + glass layer in FIG. 9) and the product in which the glass layer 20 is formed after the surface is subjected to electrolytic polishing treatment for 70 seconds to make the surface smoother (hereinafter, (electropolishing 70S +). It is called a glass layer) product, and corresponds to the electrolytic polishing 70S + glass layer in FIG. 9).

The untreated product has a surface roughness Ra (arithmetic mean roughness) of 1.2 to 1.5, but a coarser product, for example, 2 or more may be used. In that case, the (untreated + glass layer) product will also be replaced according to the untreated product used.

As the electrolytically polished product 100S, a product having a surface roughness Ra of 0.55 was used. This product has a very small roughness that the applicant has already obtained by electropolishing, that is, a product having a very smooth surface. When the surface roughness Ra is reduced by this amount, the electrolytic polishing treatment time becomes longer and the amount of the electrolytic polishing treatment liquid used increases, resulting in an increase in the waste liquid treatment cost.

As the (untreated + glass layer) product, a product having a surface roughness Ra of 1.11 was used. It should be noted that this product has a slightly smaller surface roughness Ra than the untreated product.

As the (electropolishing 50S + glass layer) product, a product having a surface roughness Ra of 0.79 was used. Further, as the (electropolishing 70S + glass layer) product, a product having a surface roughness Ra of 0.65 was used. The surface roughness Ra of the (electropolishing 70S + glass layer) product is smaller than the surface roughness Ra of the (electropolishing 50S + glass layer) product for 20 seconds more in the (electropolishing 70S + glass layer) product. This is because the surface became smoother as a result of the above.

The outline of the result is shown in FIG. First, an untreated product without the glass layer 20 and an electrolytic polishing 100S product without the glass layer 20 will be examined. According to the experimental results of coffee, tea, corn soup and onion soup, the untreated product was confirmed to be dirty in the 10th result of coffee, the 10th result of tea and the 20th result of onion soup. On the other hand, in the electrolytic polishing 100S product, stains could not be confirmed, and in both the 25th result of corn soup and the 25th result of onion soup, stains could be confirmed in the untreated product. On the other hand, in the electrolytically polished product, some stains could be confirmed.

According to the stain experiment with coffee, tea, corn soup and onion soup, the electrolytically polished 100S product is less likely to be soiled than the untreated product. That is, when there is no glass layer, the surface of the container is less likely to be soiled as the surface roughness Ra is smaller.

Next, the untreated product without the glass layer 20 and the product with the glass layer 20 (untreated + glass layer) are examined (in addition, Ra of both products is slightly different), coffee, tea, pocharisette, corn soup. And according to the experimental results of onion soup, the 10th and 20th results of coffee, the 10th and 20th results of tea, the 30th result of pocarisette, the 25th result of corn soup and the 20th result of onion soup. As a result, the untreated product was confirmed to be dirty, while the (untreated + glass layer) product was not confirmed to be dirty, and the 25th result of the onion soup was the untreated product. However, some stains could be confirmed on the (untreated + glass layer) product.

According to the stain experiment with coffee, tea, Pocari Sweat, corn soup and onion soup, the (untreated + glass layer) product is less likely to be soiled than the untreated product. That is, the surface of the stainless steel bottle 1 is less likely to be soiled when it has the glass layer 20 than when it does not have the glass layer 20.

Next, paying attention to the surface roughness Ra, a product having a similar surface roughness Ra, that is, an electrolytic polishing 100S product having no glass layer 20 and a product having a glass layer 20 (electropolishing 70S + glass layer) will be examined. As described above, the electrolytic polishing 100S product has a surface roughness Ra of 0.55, which the applicant has already obtained by the electrolytic polishing process, and is very smooth and hard to be soiled.

According to the experimental results of coffee, tea, pocarisette and corn soup, the 20th result of coffee, the 20th result of tea, and the 30th result of pocarisette showed that the electrolytically polished product was dirty. On the other hand, the (electropolishing 70S + glass layer) product could not be confirmed to be dirty, and the 25th result of the corn soup showed that the electrolytically polished product was slightly soiled, whereas the (electropolishing 70S +) product was not confirmed to be dirty. No stains could be confirmed on the glass layer) product.

According to the stain experiment with coffee, tea, pocarisette and corn soup, the product (electropolishing 70S + glass layer) is less likely to be soiled than the electrolytic polishing 100S product.

From this result, the following can be seen. That is, even if the surface roughness Ra of the stainless steel bottle 1 is slightly large, the antifouling property is improved by forming the glass layer as compared with the one having a small surface roughness Ra. Therefore, it is not necessary to form the surface roughness Ra by lengthening the electrolytic polishing treatment time unlike the electrolytic polishing 100S product. By setting the lower limit of the surface roughness Ra to 0.6, the electrolytic polishing treatment time can be shortened to 100 seconds or less, and the electrolytic polishing treatment liquid to be used can be used in a small amount, so that the production cost can be reduced accordingly.

Next, a product having a glass layer 20 (electropolishing 70S + glass layer), a product having a glass layer 20 (electropolishing 50S + glass layer), and a product having a glass layer 20 (untreated + glass layer) will be examined. The Ra of the (electropolishing 70S + glass layer) product is 0.65, the Ra of the (electropolishing 50S + glass layer) product is 0.79, and the Ra of the (untreated + glass layer) product is 1.11. As there is, all of them are above the lower limit of 0.6, and the result is better than the electrolytic polishing 100S product (Ra = 0.55). That is, the surface of the stainless steel bottle 1 is less likely to be soiled if the surface roughness Ra is 0.6 or more, which is the lower limit value. It is considered that this is because the dirt component adheres to the top of the very small convex portion on the surface of the glass layer 20 in the form of dots. And such a dirt component can be easily removed with water.

By the way, as can be seen from the comparison result between the untreated product without the glass layer 20 and the electrolytic polishing 100S product without the glass layer 20, the surface roughness Ra becomes more likely to become dirty as it becomes rougher. Therefore, the upper limit of the surface roughness Ra is set to 2, which is larger than that of the untreated product and exists as an existing container. That is, by forming the glass layer 20 on the surface of the container and setting the surface roughness Ra of the glass layer 20 within a predetermined range, that is, 0.6 to 2, the production cost is reduced and the antifouling property is improved. It has a synergistic effect of doing.

Next, regarding hydrophilicity, as described above, "the more hydrophilic the surface of the container is, the less likely it is to become dirty", and the glass layer 20 used in the above experiment is hydrophilic by itself. Have. That is, the present invention also has a glass layer 20 that exhibits hydrophilicity. Therefore, in the case of the glass layer 20 which is hydrophilic by itself, the antifouling property is further improved, which is a synergistic effect.

If the glass layer 20 itself does not have hydrophilicity, the glass layer 20 may be separately subjected to a hydrophilicity-imparting treatment. As a result, similar to the above, a synergistic effect of further improving the antifouling property is obtained. Further, the glass layer may be colorless or colored (it can be produced by a known production method), may be transparent or opaque, or may be a combination thereof.

By the way, the glass layer of the present invention has a thermal conductivity of 30 W / m · K or less (almost the same as the ceramic layer described later) and has a heat-retaining function for the time being, but because it is extremely thin, it exhibits a sufficient heat-retaining effect. Can't. Therefore, for example, when a high-temperature content is placed in a single container or a double vacuum container, the temperature of the content drops early or the outer surface of the container becomes hot with the glass layer alone, and the container becomes hot. It becomes difficult to hold the glass in your hand or touch the mouthpiece on the upper part of the outer surface. The means for solving such a problem are described below.

As shown in FIG. 5, the above means provides a heat insulating layer having a lower heat conduction than the base material of the container, for example, a ceramic layer, between the surface of the container and the glass layer. Although the ceramic layer 21 is provided between the inner surface of the inner cylinder 10 and the glass layer 20, the ceramic layer 21 provided on the outer cylinder 2 is between the outer surface of the outer cylinder 2 and the glass layer 20. The ceramic layer 21 may be provided on all or a part of the inner cylinder 10 and the outer cylinder 2. Further, the heat insulating layer may be any heat insulating layer having a heat conduction lower than that of the container, and may be, for example, a diamond-like carbon vapor-deposited layer.

The following is an example of a manufacturing method in which the ceramic layer 21 which is a heat insulating layer is formed on the surface of the base material of the container and then the glass layer 20 is formed on the surface of the ceramic layer 21. This will be described based on a schematic flow chart. First, the surface of the stainless steel bottle 1 which is a container is blasted to form a large number of fine irregularities on the surface of the stainless steel bottle 1 (see S1).

Next, a ceramic paint is applied to the blasted surface (see S2). For the coating, painting with a spray gun or the coating means described in paragraph 0065 above can be used.

After application, the paint is dried (see S3), and after drying, the stainless steel bottle 1 is fired (see S4). The firing is carried out, for example, by setting the temperature in the furnace to 300 ° C. and carrying out the firing for about 15 to 20 minutes. Then, after firing, it is naturally cooled at room temperature (see S5).

As a result, the surface of the stainless steel bottle 1 is coated with a heat insulating layer (corresponding to the heat insulating layer of the present invention) made of a ceramic layer 21 having a film thickness of 20 to 30 μm. The ceramic layer 21 is a coating film containing silicon oxide as a main component and has a lower thermal conductivity than that of the stainless steel bottle 1. The glass layer of the present invention does not include a ceramic layer.

After that, the glass layer 20 is formed on the surface of the ceramic layer 21. The details are the same as S2 to S4 in FIG. 6, and based on FIG. 7, a glass paint is applied to the surface of the ceramic layer 21 (see S6) (corresponding to S2 in FIG. 6), and then dried (S7). (See) (corresponding to S3 in FIG. 6) and then firing (see S8) (corresponding to S4 in FIG. 6).

That is, the firing of S8 is carried out, for example, at a furnace temperature of 300 ° C. for about 15 to 20 minutes, and as a result of firing, an ultrathin (for example, 1 μm) glass layer 20 is formed on the surface of the ceramic layer 21. Will be done.

The ceramic layer 21 is white, and the "insulation layer is colored" of the present invention corresponds to white in this case. By coloring the surface of the ceramic layer in a required color (for example, black), various colors and color patterns can be obtained.

The ceramic layer 21 has a film thickness of at least 10 μm or more and a thermal conductivity of at least 30 W / m · K or less. By making the ceramic layer 21 thicker than the glass layer 20 in this way, the heat retention performance is improved. In other words, the thickness on the surface of the container should be a two-layer structure consisting of a glass layer 20 of 10 μm or less and a ceramic layer 21 of 10 μm or more, and the distance between the base material of the container and the glass layer should be increased. Therefore, the heat retaining effect of the container can be further improved. Incidentally, the thermal conductivity of the stainless steel bottle 1 is 30.6 W / m · K (80 ° C.).

Summarizing the characteristic configurations of the present invention, the characteristic configuration of the present invention is to provide an ultrathin glass layer 20 on the surface of the container, and another characteristic configuration of the present invention is to provide the surface of the container with an ultra-thin glass layer 20. A hydrophilic and ultra-thin glass layer 20 is provided, and another characteristic configuration of the present invention is to provide an ultra-thin glass layer 20 having a surface roughness Ra within a predetermined range on the surface of the container. Another characteristic structure of the present invention is to provide the surface of the container with a glass layer 20 which is hydrophilic, has a surface roughness Ra within a predetermined range, and is ultra-thin. Yet another characteristic structure is that the surface of the base material has a two-layer structure consisting of a heat insulating layer having low heat conductivity and a glass layer. And, depending on each characteristic composition, a peculiar action effect and a synergistic action effect are exhibited.

In the present invention, since the base material of the stainless steel bottle 1 which is a container is covered with the glass layer 20, deterioration of the contents due to elution of metal ions or the like is suppressed, and the glass layer 20 easily follows the deformation of the base material. , Hard to break. As a result, it is possible to obtain a container that is slim and lightweight while ensuring cleanliness and good appearance, and is safe and of high quality, for example, scratch resistance, heat resistance, corrosion resistance, or gas barrier property. become able to.

According to the present invention, by further imparting hydrophilicity to the glass layer 20, it is possible to further reduce the adhesion of dirt to the surface of the container and further enhance the antifouling property.

According to the present invention, by further setting the region of the glass layer 20 on the upper part of the outer surface of the container, it is possible to reduce the metallic odor and the uncomfortable feeling of touch when the user touches the mouthpiece.

In the present invention, by further setting the surface roughness Ra of the glass layer 20 to 0.6 to 2, the production cost can be reduced and the antifouling property can be further improved.

In the present invention, by further providing a heat insulating layer having low heat conduction between the glass layer and the base material of the container, it is possible to prevent the temperature of the contents from dropping and to facilitate holding the container directly with bare hands. become able to. Further, by making the heat insulating layer a color desired by the user, the color of the container can be surely recognized by the user.

The invention of the present application is not limited to the configuration of the above-described embodiment, and it goes without saying that the design can be appropriately changed without departing from the gist of the invention.

1 ... Stainless steel bottle 2 ... Outer cylinder 5 ... Vacuum exhaust port 6 ... Wax material 10 ... Inner cylinder 15 ... Internal space 20 ... Glass layer 21 ... Insulation layer

Claims (7)

A bottomed cylindrical container with an opening at the top
The container is characterized by having a glass layer having a film thickness of 10 μm or less on its surface. The container according to claim 1, wherein the glass layer has hydrophilicity. The container according to claim 1 or 2, wherein the glass layer is provided at least on the inner surface and the upper portion of the outer surface of the container. The container according to any one of claims 1 to 3, wherein the glass layer has a surface roughness of Ra = 0.6 or more and 2 or less. The container is a vacuum double container made of stainless steel in which an exhaust port for forming a vacuum is sealed with a brazing material, and the firing temperature for forming the glass layer is lower than the melting temperature of the brazing material. The container according to any one of claims 1 to 4. The container according to claim 1, wherein a heat insulating layer having a heat conduction lower than that of the base material of the container is provided between the container and the glass layer. The container according to claim 6, wherein the heat insulating layer is colored.

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