JPH08242998A - Manufacture of porous thin film to promote bubbling property of carbonated beverage or to prevent bumping at time of liquid boiling, and container with porous thin film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide sustainable foaming of carbon dioxide which is supersatu rated carbonated drinks by fitting glass powder inside of a container by heat- treatment and forming a small air bubble between the glass powders. SOLUTION: Keeping 700 degrees working heat, the preparation ratio of glass powder diameters is adjusted to be: more than 10 μm, 49% in term of the weight ratio; 5 to 10 μm, 30%; 1.2 to 5 μm, 4%; less than 1.2 μm, 10 wt.% glass powder 6 is mixed with 8 wt.% glue, and printed as 0.3 square centimeters in area and 50 μm thick inside bottom of a soda glass cup which holds 200 ml, and dried for up to 24 hours, under raising temperature at 4 deg.C/min., and heated to 610 deg.C for ten min. to half melt the glass powder, and cooled it down in formal temperature. When beer is poured into this container, the foaming sustains more than one hour, and when boiling a water in this glass, it causes a result to avoid sudden boil due to the mild steam bubbles foaming up through the glass powder film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when a carbonated beverage is poured into a container such as a cup, continuously generates bubbles of carbon dioxide gas from the beverage in the container and continuously foams from the bottom of the container to the surface of the drinking water. In order to prevent the sudden boiling of the liquid by easily generating bubbles when the liquid contained in the container is boiled, a porous thin film manufacturing method and a porous thin film for forming a porous thin film on the inner surface of the container are provided. Regarding the container.

[0002]

2. Description of the Related Art Conventionally, as a method for promoting foaming of carbonated beverages, a foaming promoting material such as porcelain, earthenware, glass, metals or the like having a sharp concave groove or a rough surface or having porosity is embedded in the bottom surface of a container. Or, a method of attaching an object having a rough surface with an adhesive is known, and as a method for preventing bumping when boiling the liquid in the container, a method for preventing bumping by putting a porous boiling stone in the container, etc. It has been known.

More specifically, in US Pat. No. 4,322,008, a rough surface for imparting foaming property is sandblasted (San.
d blasting), acid etching, polishing (Gr
indenting) or the like, or a method of mechanically (mechenically) adhering a member having a rough surface having a coin-sized size, which is manufactured by such a method, to the container. Korean Patent Publication No. 91-6623 proposes a technique for embedding an inorganic foaming accelerator such as porcelain, earthenware, glass, and metals having sharp grooves or porosity in a container.

[0004]

However, the above-described method of forming a rough surface or a sharp groove or embedding a foaming promoting material promotes foamability when forming a rough surface or a groove. It is difficult to adjust the number and size of the small air bubbles that form the core, and also the surface of the container is severely damaged, which lowers the mechanical strength of the container itself. Of the curved surface portion is difficult to perform, and a process for forming a rough surface or a concave groove is separately required. Further, there are drawbacks such that the residue of the carbonated beverage is clogged on the rough surface or the concave groove, so that the foamability is lowered and the coloring cannot be performed.

The conventional method of adding boiling stones to prevent bumping has problems such as hygiene and error in analysis due to mixing of boiling stones, and the addition and recovery of boiling stones must be performed. There is complexity that must be taken.

Therefore, an object of the present invention is to not only foam a carbonated beverage when it is poured into a container such as a cup but also to maintain the foaming due to carbon dioxide gas in the container to give a refreshing feeling and a beautiful feeling. To obtain containers such as cups that can improve the sustainability of foam, which is a major quality factor of carbonated drinks such as beer, sunpain, cola, and carbonated soda water, and also for testing, analysis, heating, concentration, and cooking. When boiling a liquid (solution or beverage), etc., small air bubbles are left on the bottom surface of the flask or the container such as cooking utensils to prevent bumping, and the liquid can be gently boiled. To get a container that can be given.

[0007]

According to the present invention for solving the above problems, glass powder is adhered to the inner surface of a container by heat treatment to form small bubbles between the glass powders.
Continuously foaming carbon dioxide that is oversaturated in carbonated drinks,
Further, the invention is characterized in that the energy for heating by using small bubbles as nuclei during boiling of the liquid can be easily released to prevent bumping of the liquid.

That is, according to the present invention, glass powder is applied to at least a part of the inner surface of a container such as glass, porcelain, or earthenware by using printing or transfer paper so as to reach a temperature close to the softening point of glass powder. Heat to adhere the glass powder to the container in a semi-molten state, or mix an organic substance such as powdered activated carbon or a thermally decomposable substance such as carbonate with glass powder, and put this in a semi-molten state in the container. Either by adhering, or by mixing powder of a water-soluble substance such as sodium chloride or sodium carbonate with glass powder and adhering this to a container in a semi-molten state and then washing with water, small bubble nuclei are left inside the container, This small bubble nucleus promotes the foaming property of the carbonated beverage or prevents the solution from bumping.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The bubbling principle of carbonated beverages and the boiling principle of a liquid are similar, and small bubbles form the core of effervescence and boiling. In the boiling or carbon dioxide gas bubbling phenomenon, small bubbles in the wall of the container or in the liquid become nuclei, and the supersaturated carbon dioxide gas or the boiling liquid enters into these small bubbles to vaporize and the buoyancy due to the increased volume is increased. It is known that foaming or boiling begins when the adhesion is exceeded. Therefore, if the small bubbles are continuously present in a container such as glass, the bubbles can be continuously foamed or boiled by using the bubbles as nuclei.

That is, when a carbonated beverage in which carbon dioxide gas is supersaturated is placed in a container such as a cup, or when a heated liquid having a vaporization point or higher is placed in the container, in a carbonated beverage or a boiling liquid, Carbon dioxide or liquid vapor flows into the small bubbles through the interface of the small bubbles. At this time, the small bubbles increase in volume. The small bubbles with increased bulk remain attached to the bottom of the original bulk of the bubbles (that is, the bulk of the nucleus) of the container, and the amount of carbon dioxide gas increased from the supersaturated carbonated drink by the amount of carbon dioxide gas or boiling. Bubbles of about the volume that have been vaporized from the liquid and flowed in will float on the upper surface due to buoyancy.

The amount of small air bubbles that remain on the container depends on the material of the container, the type of carbonated drink, the type of boiling liquid,
There are differences due to temperature, specific gravity, viscosity, etc. The small bubbles remaining attached to the container act as a catalyst for chemical reaction as the above-described process is repeated to maintain the effervescent and boiling properties of the carbonated beverage. The principle that small air bubbles have a foaming property can be explained by using a capillary tube 4 with one end closed as shown in FIG. FIG. 2 shows a state in which carbon dioxide gas bubbles 5 or bubbles 5 due to boiling are generated with small bubbles 3 as nuclei as time passes.

Under the same conditions, the smaller the diameter of the capillary tube (that is, the smaller the volume of small bubbles), the smaller the size of bubbles that foam or boil, and the shorter the time required for one cycle. Small bubbles in the porous thin film for promoting foaming of carbonated beverages and preventing bumping of liquids are more effective as the size (diameter) of generated bubbles is smaller for aesthetic bubble formation and gentle boiling of carbon dioxide. It is effective.

The smaller the diameter of the generated bubbles, the more bubbles are generated per unit time, and the time for forming smaller bubbles and floating to the liquid surface becomes longer, and the number of bubbles generated per unit time also increases. Therefore, a large number of fine bubbles may form a bubble film on the top of the carbonated drink or the boiling liquid. In order to generate small bubbles on the bottom surface of a container, etc., a container having glass bubbles is adhered to the inner surface such as the bottom surface of the container, heated to a temperature near the softening point of the glass powder, and semi-fused. become.

This will be described in more detail as follows. The particle size of the glass powder used is about 0.1 to 50 μm. The composition of glass powder depends on the melting point of the container, the purpose of use, and the required properties such as alkali resistance, acid resistance, heat resistance, and physical strength.Addition of pigment to glass powder according to the desired color. You can also As a method of attaching the glass powder to the container, for example, a mixture of glass powder with an adhesive is directly printed or applied on the surface of the container, or the glass powder is a pigment, a crude oil, a coagulant, a deflocculant, It is possible to attach it to the inner surface of the container by using a transfer paper in which a mixture of at least one kind of oil etc. is printed or applied on a waterproof paper (sheet) such as polyethylene in the shape of desired characters or patterns. preferable.

When the glass powder is printed or attached in the form of letters or patterns, the finish of the carbonated beverage at the time of foaming, the effect of preventing boiling of the boiling liquid, the purpose of the container, the pattern of the container, the type of heat source, It is appropriately determined according to the position of the heat source, etc., and accordingly, the shape and size of characters, patterns, etc., and further, the attachment position inside the container may differ. The thin film thickness of the glass powder applied to the container by coating or printing is based on the foamability of the carbonated beverage, the type of heat source, the composition of the glass powder (particle size and composition),
Although it depends on the required strength of the thin film, the printing frequency, the use of the container, etc., 1-100 μm is usually sufficient.

With respect to the area of the glass powder thin film, for example, a carbonated beverage container having a capacity of 50 to 200 ml has a capacity of 50 to 2
00 ml Erlenmeyer flask, capacity 500-5,000 m
In the cooking utensil and the like of 1, even if the internal surface area is 1% or less, sufficient foaming promotion or bumping prevention effect can be obtained. As a method of increasing the adhesive strength and physical strength between the glass powder thin film and the container, besides adjusting the heating temperature, heating time, the size of the glass powder particles, and the glass powder formation, the glass powder thin film is formed as an upper and lower two-layer structure. It is also possible to form the glass powder thin film by differentiating the glass powder formation of the lower layer and the lower layer, for example, the upper layer is made of glass powder having a softening point at high temperature and the lower layer is made of glass powder having a softening point at low temperature.

Porosity can be imparted to the glass powder thin film as follows, for example. For example, as shown in FIG. 3, the surface of the glass powder 6 attached to the container is softened by heating so that the glass powders are fused to each other, thereby forming a space 3 between the glass powders 6. As shown in 4, one or more kinds of additive substances 7 selected from organic substances such as carbon, sugar and starch, and thermally decomposable substances such as carbonates, nitrates and sulfates are added to the glass powder, and this is added to the container 1 Carbon dioxide (CO ₂ ), water vapor (H ₂ O) generated by thermal decomposition of the above-mentioned additional substance when the glass powder thin film is heated by being attached to
Micropores 3 may be generated by a gas such as nitrogen dioxide (NO ₂ ), sulfur dioxide (SO ₂ ), etc. (glass powder is fused), and further sodium chloride (as shown in FIG. 5) NaCl), sodium carbonate (Na ₂ CO ₃ ) and other water-soluble substances, and at least one powder 8 is mixed with glass powder 6 and oil, and the mixture is applied to a container to apply glass powder. After attaching to the container as a semi-molten state,
Wash with water to create a porous space.

The present invention can be carried out in-line in a general process of manufacturing glass containers: raw material → melting → molding → heat treatment → slow cooling → inspection process. The effect of promoting foamability of the present invention is that, when a carbonated beverage is poured into a container such as a can, large carbon dioxide gas bubbles are generated in a short time in a conventional container, while a carbonated beverage is intentionally added. A small carbon dioxide gas bubble is generated by leaving a small bubble on the bottom surface of the container. Therefore, the foaming property is promoted, and carbonated drinks under the same conditions can be drunk cooler and tastier. On the other hand, carbonated beverages such as beer as shown in FIG. 5 have the effect of forming a bubble film on the surface and maximally preventing oxidation. Moreover, when pouring a carbonated drink into a large container of 1 liter or more, it is possible to obtain a sales promotion and advertising effect at the same time.

With respect to the effect of preventing bumping of the present invention, it is possible to prevent the liquid from being heated to a temperature higher than the boiling point by the boiling of small air bubbles serving as a core of boiling, and cooking in a kitchen, a microwave oven, It has the effect of preventing bumping during test analysis, distillation under reduced pressure, heat concentration, and heating of glass / ceramic containers such as boilers.

[0020]

【Example】

[Example 1] With a working temperature of 700 ° C, the composition ratio of each particle size was 10μ or more by weight ratio; 49%, 5 to 10μ; 30
%, 1.2-5 μ; 4%, 1.2 μ or less; 10% of glass powder was mixed with an adhesive at a weight ratio of 10: 8, and the mixture was mixed with a 200 ml capacity soda glass cup to have an area of 0 After printing with a thickness of 3cm ² and a thickness of 50μ and drying for 24 hours,
The glass powder was semi-molten by heating at 610 ° C. for 10 minutes while increasing the temperature at 4 ° C./minute, and then cooled to room temperature. When beer was poured into this container 1 as shown in FIG. 1, foaming continued for 1 hour or more. Also, when water was added and boiled, there was an effect of preventing bumping by the steam bubbles 5 gently generated from the glass powder thin film.

[Example 2] Transfer paper for a kitchen container at a working temperature of 720 ° C (transfer paper to which glass powder is adhered) is 2 mm.
Cut into a 6 mm x 6 mm rectangular parallelepiped and use this transfer paper to make a volume of 1
Glass powder was adhered to the inner bottom surface of a 50 ml soda glass cup, the temperature was raised at 4 ° C./min, the mixture was heated at 620 ° C. for 10 minutes to be semi-molten, and then cooled to room temperature. When this container was subjected to the same foamability and bumping prevention test as in Example 1, the same effect as in Example 1 was obtained. When glass powder is attached to a container as in Example 2, not only a rectangular shape but also a picture, various characters or figures can be displayed according to the application and pattern of the container, and a pattern is displayed. can do. The working temperature, heating temperature, and heating time of the glass powder can be varied depending on the material, pattern, softening point, and purpose of use of the container.

[Example 3] Glass powder having a working temperature of 650 ° C and powdered carbon were mixed in a ratio of 99: 1, adhered to a container in the same manner as in Example 1, and heated at 600 ° C for 20 minutes. , Cooled to room temperature. When the same foamability and bumping prevention test as in Example 1 were performed on this container, the same effect as in Example 1 was obtained. Example 4 Glass powder and salt (NaC) at a working temperature of 700 ° C.
1) was mixed and adhered to a container in the same manner as in Example 1, heated at 610 ° C. for 30 minutes, cooled, then washed with water and dried. When the same foamability and bumping prevention test as those of the example were conducted on this container, the same effect as that of the example 1 was obtained.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a container having a porous thin film formed by the method of the present invention.

FIG. 2 is a sectional view showing the foaming principle of a porous thin film formed by the method of the present invention.

FIG. 3 is an explanatory view showing a state in which a minute space is generated between glass particles in the porous thin film formed by the method of the present invention.

FIG. 4 is an explanatory view showing a state in which pores are generated by thermal decomposition of an additive substance in the porous thin film formed by the method of the present invention.

FIG. 5 is an explanatory view showing a state in which glass powder to which a water-soluble substance is added is adhered to the container surface in the method of the present invention.

[Explanation of symbols]

1 ... Container, 2 ... Pore, 3 ... Space, 4 ... Capillary tube, 5 ... Bubble, 6 ... Glass powder, 7 ... Additive substance, 8 ... Water-soluble substance

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location B05D 7/22 B05D 7/22 Q B65D 25/14 B65D 25/14 Z C03B 19/01 C03B 19 / 01

Claims (5)

[Claims] 1. In order to promote foaming when a carbonated beverage is poured into a container or to prevent bumping when the liquid in the container boils,
A method for forming a porous thin film on the inner surface of a container,
Forming a porous thin film in which a minute space 3 is formed between particles of the glass powder 6 by adhering the glass powder 6 to at least a part of the inner surface of the container and heating the glass powder to a softening point temperature to fuse the glass powder 6 with each other. A method for producing a porous thin film for promoting foaming of carbonated beverages or preventing bumping during boiling of liquid. 2. When fusing a thin film of glass powder 6 to the inner surface of the container 1, the upper layer of the glass powder thin film is made of glass powder having a high temperature softening point, and the lower layer of the glass powder thin film is made of a low temperature softening point. The method for producing a porous thin film according to claim 1, wherein each of the glass powders has a glass powder, and these are fused to the inner surface of the container. 3. The glass powder 6 on the inner surface of the container 1, carbon,
Organic substances such as sugar, starch, etc., and substances to which the additive substance 7 consisting of one or more kinds of thermally decomposable substances such as carbonates, nitrates, sulfates, etc. are added are attached, and the heat of the additive substance 7 is applied during heat fusion. Carbon dioxide, water vapor, nitrogen dioxide produced by decomposition,
The method for producing a porous thin film according to claim 1, wherein fine pores 2 are formed by a gas such as sulfur dioxide. 4. The glass powder 6 on the inner surface of the container 1 is selected from water-soluble substances such as sodium chloride and sodium carbonate.
Apply a mixture of at least one kind of powder 8 and oil,
The method for producing a porous thin film according to claim 1, wherein the porous thin film is formed by fusing and then washing with water to form porosity. 5. A container having a porous thin film formed on at least a part of its inner surface by the method for producing a porous thin film according to claim 1, 2, 3, or 4.