JP6880361B2 - Drinking container - Google Patents

Description

The present invention relates to a drinking container used by pouring a liquid.

When pouring an effervescent liquid such as beer, low-malt beer, or carbonated drink into a cup, the carbonic acid component dissolved in the liquid appears as bubbles. For example, in beer, the carbon dioxide gas generated when pouring appears as bubbles. It is known that this foam affects the taste of beer, and that the foam covers the liquid surface to prevent contact with air and suppress deterioration of the taste.

As the material of such a cup, glass, pottery, metal or the like is used. Conventionally, the inner surface of a cup is often flat, and the inner surface of a glass cup is naturally flat. In many metal cups, the inner surface is polished like a mirror surface, but in recent years, there are some that leave the unevenness as it is, or polish it to a certain extent and leave the unevenness.

The inner surface of a metal cup is generally finished by, for example, buffing (rotary polishing) of about # 400 or precision machining finishing (rotary cutting). The finishing (polishing) direction is the circumferential direction depending on the processing method. Therefore, in the case of machining, fine irregularities are formed in a ring shape in the horizontal direction. Further, since the purpose of these processing methods is to form a smooth surface, it is difficult to reproduce the unevenness. Alternatively, when the unevenness is left without polishing to the mirror surface, the originally existing unevenness has no regularity, so that the remaining unevenness has no reproducibility and is non-uniform.

For example, in Patent Document 1, a large number of counterbore holes are formed from the outside in a beer mug made of an aluminum alloy, and fine holes penetrating the bottom surface of the counterbore holes are formed, and the counterbore holes are formed by a sealing member. Seal. As a result, a large number of recesses formed by fine holes are formed on the inner surface of the beer mug, and bubbles are generated from the recesses. With such a structure, the position of the recess can be controlled, but it is very difficult to process and it is a laborious process. Further, even if the recess is provided, the state of foam generation changes depending on the state of the inner surface of the beer mug.

Although it is not a drinking container, for example, Patent Document 2 describes a shaker made of stainless steel, and describes that the inner surface is polished in the vertical direction to give a mirror finish.

Japanese Unexamined Patent Publication No. 2011-200310 Japanese Unexamined Patent Publication No. 2015-084999

The present invention has been made in view of the above circumstances, and is a drinking container capable of achieving fine foaming and extending the time until the generated foam disappears when a liquid having effervescence is poured. It is intended to be provided.

The invention according to claim 1 of the present application is a drinking container characterized in that irregularities having an average wavelength to wave height ratio of 0.005 or more are formed on at least the inner side surface in a wavelength range of 1 μm or less. ..

The invention according to claim 2 of the present application is a drinking container characterized in that the unevenness formed on the inner side surface in the invention according to claim 1 of the present application is formed in the vertical direction.

The invention according to claim 3 of the present application is characterized in that the unevenness formed on the inner side surface in the invention according to claim 1 or 2 of the present application is formed on a part of the inner side surface. It is a drinking container.

The invention according to claim 4 of the present application is a drinking container according to claim 3 of the present application, wherein a different material is used for a region other than the region where the unevenness is formed.

According to the present invention, when a liquid having foaming property is poured, fine foaming can be realized, and the time until the generated bubbles disappear can be extended.

It is sectional drawing which shows one Embodiment of the drinking container of this invention. It is a graph which shows an example of the relationship of the wave height to the wavelength ratio with respect to the wavelength in each rank of F polishing and the conventional product. It is explanatory drawing (photograph) of the experimental example of the time-dependent change of foam in a drinking container of this invention and a conventional product. It is explanatory drawing of the comparative example of the size of the foam in the drinking container of this invention and the conventional product. It is explanatory drawing (photograph) of the comparative example of the size of the foam in the drinking container of this invention and the conventional product. It is explanatory drawing (photograph) of an example of the time-dependent change of the size of the foam in the drinking container of this invention. It is explanatory drawing (photograph) of an example of the time-dependent change of the size of a bubble in a conventional product. It is explanatory drawing of an example of the time-dependent change of the size of a bubble in a drinking container of this invention and a conventional product. It is explanatory drawing of an example of a test result of a sensory test. It is sectional drawing which shows the 1st modification of one Embodiment of the drinking container of this invention. It is sectional drawing which shows the 2nd modification of one Embodiment of the drinking container of this invention.

FIG. 1 is a cross-sectional view showing an embodiment of the drinking container of the present invention. In the figure, 1 is a main body, 2 is an inner side surface, 3 is an inner bottom surface, and 4 is an outer surface. In the example shown in FIG. 1, the main body 1 shows a drinking container having a double structure composed of a plate material serving as an outer surface 4 and a plate material serving as an inner side surface 2 and an inner bottom surface 3. Not limited to this, a single-layer structure in which one surface of the plate material is the outer surface 4 and the other surface is the inner side surface 2 and the inner bottom surface 3 may be used. Needless to say, various modifications such as a structure with a handle are possible.

At least the inner surface 2 of the main body 1 is formed with irregularities having an average wavelength to wave height ratio of 0.005 or more in a wavelength range of 1 μm or less. By performing such processing, as shown in the experimental example described later, it is possible to generate small bubbles and bubbles of uniform size, and it is possible to prolong the duration of the bubbles. .. This unevenness will be described later using the measurement results.

Further, in the drinking container of the present invention, at least the inner surface 2 is processed, but in the drinking container, the area of the inner surface 2 is larger than the area of the inner bottom surface 3, and the generated bubbles are generated on the inner surface 2. There are many uniform small bubbles. The unevenness to be formed may be an unevenness extending in the vertical direction (the direction connecting the opening and the inner bottom surface 3). The bubbles generated on the inner side surface 2 tend to rise to the liquid surface along the unevenness in a small state. Of course, there may be an unprocessed portion on the inner surface 2.

The inner bottom surface 3 may have the same unevenness as the inner surface surface 2, or may be a flat surface. For example, in the case of a metal drinking container, unevenness may be formed by mirror finishing or hairline processing. As described above, since the area of the inner bottom surface 3 is smaller than the area of the inner surface surface 2, it is considered that the influence of the inner surface surface 2 is dominant. Of course, it is desirable that the inner bottom surface 3 also has irregularities formed so that bubbles having a size not so different from the size of the bubbles generated from the inner side surface 2 are generated.

The processing of the outer surface 4 is optional. For example, in the case of a metal drinking container, the metal surface may be used as it is, may be mirror-processed by buffing, may be machined such as hairline processing, or may be patterned. Good. Further, processing such as covering with another member may be performed. If it is a drinking container made of another material, it may be processed according to the material, and it can be used in combination with other members.

When the main body 1 is made of metal, for example, there is a method described as "F polishing" in Japanese Patent No. 4064438 as an example of a processing method for forming the above-mentioned unevenness on at least the inner surface 2. This method is described in the same document as a technique for preventing powder from adhering to a metal surface, but processing of a drinking container has not been considered. In this F-polishing, the metal surface is polished using a polishing material in which hard polishing particles such as diamond, whose sharpness is not lost even if the polishing work is advanced, are attached to paper or cloth. It is ranked according to the nominal roughness of the abrasive particles, and "F-3" (# 40), "F-2" (# 60), "F-1" (#) in the order of coarser surface finish. It will be referred to as 120). In addition to this, F0, F1, ... .. .. There are F7 and the like, but as will be described later, F-3, F-2, and F-1 are suitable as the rank of F polishing process for the drinking container.

Conventionally, the polishing process is performed to reduce or eliminate the unevenness, but the above-mentioned F polishing is a processing method for forming a predetermined unevenness while being a polishing process. Conventionally, the process of forming unevenness in this way has not been performed by polishing. Further, in the conventional polishing process that leaves unevenness, it is not possible to know what kind of state the remaining unevenness is, and there is no reproducibility. In the present invention, unevenness is formed on at least the inner side surface 2, and as one method for forming the unevenness, the above-mentioned polishing process called F polishing can be performed. Further, when the above-mentioned F polishing process is performed, the unevenness that has existed until then is eliminated, and the unevenness is formed by polishing, so that the unevenness in a stable state is formed. During this F polishing process, polishing is performed in the vertical direction (the direction connecting the opening and the inner bottom surface 3) to form unevenness extending in the vertical direction.

Although there are various processing methods other than F polishing, F polishing can be easily performed as compared with laser processing and precision machining, and can provide an inexpensive device. In addition, the unevenness can be reproducible as compared with hairline processing and blasting, and a stable product with less product variation can be manufactured. Of course, any processing method that can realize the present invention is not excluded.

A wavenumber analysis using a Fourier transform was attempted on the unevenness formed by the above-mentioned F polishing. By this analysis, the characteristics of the unevenness on the surface can be quantified, and specifically, the unevenness at what interval and the height difference can be expressed numerically. Regarding the uneven shape of the steel sheet surface by F polishing of several ranks of F polishing, the following equation (1)
X (k) = Σ _{n = 0} ^N-1 x (n) · exp (-2πknj / N)… (1)
The discrete Fourier transform was performed according to the above, and the relationship between the wavelength (concavo-convex pitch) component L and the wave height (amplitude: concavo-convex height) component H of the concavo-convex was analyzed. For comparison reference, Fourier analysis was also performed on the conventional product whose inner surface was polished to some extent, and the comparison with F polishing was performed. In equation (1), x (n) is the height measured by the probe sensor at a predetermined sampling interval when the surface of the steel plate is scanned in the predetermined length (distance) direction by the probe sensor. The value in the direction (representing the unevenness of the surface), that is, the nth digital sampling value in the total number of samplings N. Further, k is a value corresponding to the wave number (spatial frequency) f [times / μm] per unit length (k = 0, 1, 2, ..., N-1), and the total measurement distance is D [μm]. Then, it is represented by k = fD.

That is, X (k) is a vector representing the signal strength after Fourier transform with respect to the wave number corresponding value k per unit length, and the absolute value (length) of this vector is proportional to the unevenness (amplitude) of the wave. Therefore, the wave height (amplitude) H of the concave-convex shape is represented by 2 | X (k) | / N with respect to the converted signal strength X (k) with respect to the value k, and the ratio of the wave height (amplitude) H to the wavelength L ( “Wave height (amplitude) to wavelength ratio”, “wave height ratio” or “amplitude ratio”) H / L is H / L = 2 | X (k) | / NL ... (2)
It is represented by.

FIG. 2 is a graph showing an example of the relationship between each rank of F polishing and the wave height to wavelength ratio with respect to the wavelength in the conventional product. When the above-mentioned wave height to wavelength ratio is shown for each wavelength, the result shown in FIG. 2 is obtained as an example. FIG. 2 shows the average of the results measured at several locations for the cases where the ranks of F polishing are F-3, F-2, and F-1, and for the conventional product which has been polished to a certain extent.

With reference to the analysis results shown in FIG. 2, clear differences appear in each graph in the range where the wavelength L is 1 μm or less. Looking at the wavelength L in the range of 1 μm or less, when F polishing is performed, the value of the wave height to wavelength ratio is larger than that of the conventional product. More specifically, the value of the wave height to wavelength ratio in the range where the wavelength L is 1 μm or less is 0.005 or less in the conventional product, whereas the rank is F-3, when F polishing is performed. In both cases of F-2 and F-1, it was 0.005 or more. Although not shown, for example, when mirror finishing is performed, the value of the wave height to wavelength ratio in the range where the wavelength L is 1 μm or less is 0.0001 or less, which is a smaller value. In each case, the wave height to wavelength ratio in the range where the wavelength L was 1 μm or less was 0.03 or less.

A comparative experiment was conducted on the size and duration of bubbles generated between the drinking container and the conventional product when the ranks of F polishing described above were F-3, F-2, and F-1. When an effervescent liquid is poured into a drinking container, bubbles are generated from the liquid. With this foam, you can get a refreshing feeling and a refreshing feeling when you drink the liquid. Especially in the case of beer, the generated foam affects the taste of beer, and if the foam is small, the taste becomes creamy. In addition, the generated bubbles cover the liquid surface to block the liquid surface from contact with air and suppress the deterioration of taste. Therefore, it is desired as a drinking container that the generated foam is small and the generated foam can be continued for a long time.

FIG. 3 is an explanatory diagram of an experimental example of changes in foam with time in the drinking container of the present invention and the conventional product. In FIG. 3, each container is observed from above. The container (A) is a conventional product, and is a product in which irregularities remain in the circumferential direction (horizontal direction). (B) to (D) are the drinking containers of the present invention, in the vertical direction with respect to the inner side surface 2, (B) is F-polished with a rank of F-1, and (C) is a rank of F-. The F polishing process of No. 2 is performed, and the F polishing process of rank F-3 is performed in (D). Hereinafter, an example of the drinking container of the present invention subjected to the F polishing process of rank F-1 is an example of the F-1 container, and an example of the drinking container of the present invention subjected to the F polishing process of rank F-2 is F-2. An example of a container and a drinking container of the present invention which has been subjected to F polishing processing of rank F-3 will be referred to as an F-3 container.

The temperature of each container was set to almost the same temperature, and beer at almost the same temperature was poured here as well, and the state of bubbles changing with the passage of time was observed. Then, when 60 seconds had passed, the liquid level of beer was first observed in the conventional container shown as (A).

After observing the liquid level of beer with the conventional product shown in (A), further observation was continued. When 120 seconds had passed, the F-1 container and F- shown as (B) and (D) were finally observed. The liquid level of beer was observed for 3 containers. For the F-2 container shown as (C), the liquid level of beer was observed after 240 seconds had passed.

As described above, it can be seen that in the drinking container of the present invention, foaming continues for a clearly longer period of time as compared with the conventional product. In particular, for the F-2 container shown as (C), the state in which the liquid level of beer was covered with foam continued for nearly 4 minutes. From this experiment, the beer liquid level is blocked from contact with air for a long time as compared with the conventional product, and deterioration of taste can be suppressed.

Further, as can be seen with reference to FIG. 2, when comparing the wave height to wavelength ratio at a wavelength of 1 μm or less, the F-2 container (rank F-2) is the largest, followed by the F-1 container (rank F-1). ), F-3 container (rank F-3), and the value of the conventional product is smaller than these. Comparing the value of the wave height to wavelength ratio when the wavelength is 1 μm or less with the experimental result shown in FIG. 3, it can be seen that the larger the value of the wave height to wavelength ratio when the wavelength is 1 μm or less, the longer the duration of the bubble. As described above, in all of the F-3 container, the F-2 container, and the F-1 container, the value of the wave height to wavelength ratio at a wavelength of 1 μm or less is 0.005 or more, and if it is this value or more. It is possible to secure a longer foam duration than conventional products.

4 and 5 are explanatory views of a comparative example of the size of bubbles in the drinking container of the present invention and the conventional product. In the figure, reference numeral 11 denotes a transparent resin plate. In order to observe the bubbles actually generated, as shown in FIG. 4A, the drinking container is cut in half in the vertical direction, and the transparent resin plate 11 is adhered to the cut surface so that the inside can be observed. I made it.

5 (A) shows the case where the conventional product used in the experiment of FIG. 3 was cut in half and used, and FIG. 5 (B) shows the drinking container of the present invention used in the experiment of FIG. , The case where the F-2 container, which had the best results, was cut in half and used. In each case, the state immediately after pouring beer is shown. Comparing the two, the conventional product shown in FIG. 5 (A) contains large bubbles in the foam portion, whereas the F-2 container shown in FIG. 5 (B) generates uniform bubbles. You can see what you are doing. Of course, the influence of the transparent resin plate 11 cannot be denied, but since both of them have the influence, it is considered that the difference in the generated bubbles is due to the unevenness formed on the inner side surface 2, and the drinking container of the present invention is used. For example, it can be said that many bubbles that are almost uniform are generated.

For the bubbles existing at the boundary with the liquid surface in this state, the diameter of the bubbles was measured using a microscope. The measurement results and the average of the four bubbles at different positions are shown in FIG. 4 (B). From this result, the diameter of the foam generated in the conventional product is about 500 μm to 600 μm, whereas the diameter of the foam generated in the F-2 container is about 400 μm to 450 μm, and in the case of the F-2 container, it is about 400 μm to 450 μm. It can be seen that smaller bubbles are generated compared to the conventional product. From this, it can be said that in the drinking container of the present invention, the generated foam is smaller than that of the conventional product. If the liquid to be poured is beer, the smaller the foam, the creamier the taste. Further, since the variation in the diameter of the foam generated in the F-2 container is smaller than that of the conventional product, it can be said that the drinking container of the present invention generates more uniform foam than the conventional product.

Generally, the pressure P in the bubble is larger than the atmospheric pressure P0, and the following formula (Young-Laplace equation) is used by using the surface tension γ of the liquid and the radius R of the bubble.
P = P0 + 4γ / R
It is represented by. The smaller the diameter of the bubble (the smaller the radius R of the bubble), the larger the pressure P inside the bubble. Therefore, when the sizes of adjacent bubbles are different, the small bubbles merge with the large bubbles due to the difference in the internal pressure, are absorbed and become large, and the bubbles become fragile. That is, the life of the foam is shortened. On the other hand, when the bubbles become uniform, it becomes difficult for adjacent bubbles to coalesce, and the life of the bubbles becomes longer. Therefore, by generating bubbles as uniform as possible, the life of the generated bubbles can be extended.

As can be seen from the above experiment, in the drinking container of the present invention, the sizes of the generated bubbles are uniform, and the duration thereof is longer than that of the conventional product. This is in agreement with the theoretical finding that the coalescence of bubbles is less likely to occur and the life of bubbles is extended as described above. In the conventional product, since the unevenness formed on the inner side surface 2 is not uniform, it is considered that the size of the generated bubbles is not uniform. It is presumed that the adjacency of such irregular bubbles promotes the coalescence of bubbles as described above, causing the bubbles to disappear at an early stage due to rupture, and therefore the bubbles disappear faster.

6, FIG. 7, and FIG. 8 are explanatory views of an example of the time-dependent change in the size of bubbles in the drinking container of the present invention and the conventional product. Using a container cut in half as shown in FIG. 4 (A), the change over time of the foam from the state shown in FIG. 5 was examined. As described above, the more uniform the size of the bubbles, the longer it takes for the bubbles to disappear. Therefore, from this experiment as well, it is assumed that the drinking container of the present invention has a longer duration of bubbles. In this case as well, a comparison was made between the conventional product and the F-2 container as the drinking container of the present invention. FIG. 6 shows the state of bubbles changing with time in the F-2 container, and FIG. 7 shows the state of bubbles changing with time in the conventional product. Further, FIG. 8 summarizes the measurement results of the diameter of the bubbles that change with time.

In this experiment, in the case of the conventional product, as shown in FIG. 7, bubbles equivalent to the bubbles generated when beer was poured remained on the liquid surface until 60 seconds passed, but after that, the transparent resin was used. Only bubbles adhering to the board remained. On the other hand, in the case of the F-2 container, as shown in FIG. 6, bubbles were almost uniform on the liquid surface even after 120 seconds had passed, and bubbles were present on the liquid surface even after 180 seconds had passed. You can see that. As described above, even in the observation of the cross section, in the drinking container of the present invention, substantially uniform bubbles are present for a long time as compared with the conventional product, and the liquid level can be prevented from coming into contact with air for a long time.

FIG. 9 is an explanatory diagram of an example of the test result of the sensory test. Using the F-1 container, F-2 container, and F-3 container, which are the drinking containers of the present invention described in FIG. 3, and the conventional product, 23 adult men and women aged 23 to 65 years feel sharp and squishy. We asked them to answer which container was applicable to each item of feeling and creamy feeling, and tabulated. The sharpness expresses the feeling of being cold, smooth, and disappearing and not remaining in the mouth. In addition, the squishy feeling indicates that the stimulus of carbonic acid is firmly felt. In addition, the creamy feel is mild and easy to drink.

With reference to the test results, it can be seen that the drinking container of the present invention was selected by more subjects than the conventional product in terms of sharpness and creaminess. As mentioned above, the creamy feel is mild and easy to drink, and the bubbles generated are related to the fineness. As can be seen from each of the above experiments, it is considered that the drinking container of the present invention has finer bubbles than the conventional product, which gives a creamy feeling. In addition, the goodness of sharpness expresses the feeling of coldness, smoothness, and non-remaining in the mouth as described above, but the drinking container of the present invention uniformly generates finer bubbles than the conventional product, so that the sharpness is felt. It is thought that it is directing.

On the contrary, there were many subjects who felt a squishy feeling with the conventional product. As mentioned above, the squishy feeling indicates that the stimulus of carbonic acid is firmly felt, but this is because the bubbles generated by the conventional product are larger and non-uniform, so the bubbles burst immediately in the mouth. It is considered that this causes the stimulation of carbonic acid.

As described above, from the results of the sensory test shown in FIG. 9, the drinking container of the present invention obtained a significant result in terms of taste as compared with the conventional product. This is considered to be due to the difference in the inner surface processing of the drinking container, and it was confirmed that the inner surface processing of the drinking container of the present invention also affects the taste.

Further, the highest evaluation was obtained for the F-2 container having the largest value of the wave height to wavelength ratio when the wavelength was 1 μm or less, and the lowest evaluation was obtained for the conventional product having the smallest value. From this, it was found that the larger the value of the wave height to wavelength ratio at a wavelength of 1 μm or less, the better the evaluation can be obtained in the sensory test.

As a conventional product, a drinking container whose inner surface is mirror-finished is also used, but in this case as well, the size and duration of the bubbles are about the same as those of the above-mentioned conventional product, and bubbles of different sizes are generated. The duration was also shorter than that of the drinking container of the present invention. Further, in the conventional glass drinking container, the duration is shorter than that of the above-mentioned metal conventional product, and bubbles having different sizes are generated. Of course, compared with the drinking container of the present invention. Is also inferior. In the sensory test as well, when these products were compared with the drinking container of the present invention, the drinking container of the present invention felt sharper and creamier.

In the above experiment, as the drinking container of the present invention, a container in which the inner side surface 2 was F-polished was used. However, the present invention is not limited to this, and it goes without saying that processing having the above-mentioned characteristics may be performed by using other processing methods such as laser processing and precision machining. Further, as the material of the drinking container, metal is used in the above-mentioned example, but the material is not limited to this, and various materials such as glass, resin, and pottery that can be processed to have the above-mentioned characteristics on the inner surface 2 are used. It may be a material. Of course, it goes without saying that the metal may be various metals such as titanium, copper, and tin, in addition to the generally used stainless steel. Further, even if the drinking container is molded using a mold or the like, or the drinking container whose inner surface is post-processed using a mold, the inner surface 2 after molding may have the above-mentioned characteristics. Needless to say, it is included in the present invention.

Further, the above-mentioned processing for forming unevenness on the inner surface 2 may be performed on a part of the inner surface 2. For example, the above-mentioned processing may be performed on the inner bottom surface 3 of the inner side surface 2 to a predetermined height to form the above-mentioned unevenness on a part of the inner side surface 2. When the unevenness is formed on a part of the inner surface 2 in this way, the material may be unified as the whole drinking container as in the above example, but the part other than the region where the unevenness is formed is changed to another material. You may. Hereinafter, an example in this case will be shown as a modified example.

FIG. 10 is a cross-sectional view showing a first modification of the embodiment of the drinking container of the present invention. In the figure, 21 is a metal part and 22 is a glass part. In this first modification, an example in which different materials are used for the upper part and the lower part of the drinking container is shown.

The lower part of the drinking container is a metal part 21, and at least the inner side surface 2 thereof is subjected to various processing methods such as F polishing, so that the average wavelength to wave height ratio is 0.005 or more in the range of 1 μm or less. It is formed. Of course, the inner bottom surface 3 may be processed. Note that FIG. 10 (A) shows an example in which the inner bottom surface 3 is configured as a flat surface, and FIG. 10 (B) shows an example in which the inner bottom surface 3 is hemispherical. In the configuration shown in FIG. 10B, the above-mentioned unevenness may be formed from the inner side surface 2 to the inner bottom surface 3. Of course, it is not necessary to form the above-mentioned unevenness on the entire inner bottom surface 3, and in any example, it is not necessary to form the above-mentioned unevenness on the entire inner surface surface 2. Further, the above-mentioned unevenness may be formed not only on the entire inner side surface 2 of the metal portion 21 but also on a part thereof. The metal used as the metal portion 21 may be various metals such as titanium, copper, and tin, in addition to the generally used stainless steel.

Further, the upper part of the drinking container is a glass part 22, which is joined to the lower metal part 21. The joining method is arbitrary, but it may be bonded with an adhesive, for example, so that liquid does not leak from the jointed portion.

In a drinking container having such a configuration, fine homogeneous bubbles are generated on the inner surface 2 of the metal portion 21 and rise in the liquid. If the glass portion 22 is made transparent, the user can observe bubbles rising in the liquid and a layer of fine bubbles covering the liquid surface. Further, in beer and the like, the golden color of the liquid portion and the contrast between the golden color and the white of the foam can be observed. As a result, the drink can be enjoyed visually, and the desire to eat and drink can be further stimulated. Of course, the glass portion 22 does not have to be transparent, and may be colored glass, translucent, opaque glass, or may be decorated. Even in these cases, the design can be improved. Of course, the material different from the metal part 21 is not limited to glass, but may be plastic or other material.

FIG. 11 is a cross-sectional view showing a second modification of the embodiment of the drinking container of the present invention. In this second modification, an example in which a different material is used for the lower portion of the inner surface 2 of the drinking container is shown. In the example shown in FIG. 11, the metal portion 21 is arranged on the bottom of the glass drinking container, and the lower portion of the inner bottom surface 3 and the inner side surface 2 of the drinking container is the metal portion 21.

The metal portion 21 is formed with irregularities having an average wavelength-to-wavelength ratio of 0.005 or more in a wavelength range of 1 μm or less by various processing methods such as F polishing on at least the inner surface surface 2. .. Of course, the inner bottom surface 3 may be processed, or the inner surface surface 2 may have an unprocessed portion. The periphery of the metal portion 21 is joined to the glass portion 22. The joining method is arbitrary, but it may be performed by, for example, bonding. The metal used as the metal portion 21 may be various metals such as titanium, copper, and tin, in addition to the generally used stainless steel.

Even in a drinking container having such a configuration, fine homogeneous bubbles are generated on the inner surface 2 of the metal portion 21 and rise in the liquid. If the upper part of the glass portion 22 is made transparent, the user can observe bubbles rising in the liquid and a layer of fine bubbles covering the liquid surface. Further, in beer and the like, the golden color of the liquid portion and the contrast between the golden color and the white of the foam can be observed. As a result, the drink can be enjoyed visually, and the desire to eat and drink can be further stimulated.

Of course, the glass portion 22 does not have to be transparent, and may be colored glass, translucent, opaque glass, decorated glass, or the like. In particular, in this example, if the entire glass portion 22 is transparent, the joint portion between the metal portion 21 and the glass portion 22 can be visually recognized from the outside, and the design is deteriorated. In order to eliminate such a problem, it is preferable to make the glass portion 22 opaque or translucent in the portion where the joint between the glass portion 22 and the metal portion 21 is visually recognized. As an example, it is advisable to perform blasting or the like from the outside of the glass portion 22. By blasting, the transparent glass becomes cloudy, and the joint portion between the metal portion 21 and the glass portion 22 becomes difficult to see from the outside, which can prevent deterioration of the design and improve the design by blasting. .. Of course, the same effect can be obtained even if the lower part is opaque and the upper part is transparent glass with gradation or the lower part is decorated. Of course, the glass portion 22 may use a plastic or other material as a material different from the metal portion 21.

Also in each of the above-mentioned modifications, F polishing is used as a method for forming irregularities having an average wavelength-to-wave height ratio of 0.005 or more on the inner surface 2 in a wavelength range of 1 μm or less, and irregularities are formed on the metal portion 21. did. However, the present invention is not limited to this, and it goes without saying that processing having the above-mentioned characteristics may be performed by using another processing method such as laser processing or precision machining.

Further, in each of the above-described modifications, glass and metal are used as the materials of the drinking container, but a portion having no unevenness, for example, a material used in place of the glass portion 22 is arbitrary, and a portion forming the unevenness. For example, the material used in place of the metal portion 21 may be various materials such as glass, resin, and earthenware as long as they can form irregularities having the above-mentioned characteristics. Further, even in a drinking container in which irregularities are formed by using, for example, a mold, or at least the inner surface is post-processed by using a mold, the inner surface 2 after molding has the above-mentioned characteristics. Needless to say, if so, it is included in the present invention.

1 ... Main body, 2 ... Inner side surface, 3 ... Inner bottom surface, 4 ... Outer surface, 11 ... Transparent resin plate, 21 ... Metal part, 22 ... Glass part.

Claims (4)

A drinking container characterized in that irregularities having an average wavelength-to-wave height ratio of 0.005 or more are formed on at least the inner side surface in a wavelength range of 1 μm or less. The drinking container according to claim 1, wherein the unevenness formed on the inner side surface is formed in the vertical direction. The drinking container according to claim 1 or 2, wherein the unevenness formed on the inner side surface is formed on a part of the inner side surface. The drinking container according to claim 3, wherein a different material is used for a region other than the region where the unevenness is formed.

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