JP2018029959A - Beverage container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a beverage container, when effervescent liquid is poured therein, providing fine foams and capable of elongating a time until the generated foams are gone.SOLUTION: A body 1 of a beverage container includes asperities with an average ratio of a wavelength to a wave height of 0.005 or more within a wavelength range of 1 μm or less at least on an inside face 2 thereof. This processing can provide, when the effervescent liquid, for example, beer is poured therein, substantially uniform fine foams. Further, the generation of the substantially uniform foams prevents the foams from being gathered and getting large, so as to elongate a time until the generated foams are gone.SELECTED DRAWING: Figure 1

Description

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

  When pouring effervescent liquids such as beer, sparkling liquor, and carbonated beverages into the cup, the carbonate component dissolved in the liquid appears as bubbles. For example, in beer, carbon dioxide generated when it is poured appears as bubbles. It is known that this foam affects the taste of beer, and the foam covers the liquid surface to prevent contact with air and suppress deterioration of the taste.

  As a material for such a cup, glass, earthenware, metal or the like is used. Conventionally, the inner surface of a cup is often flat, and naturally the inner surface of a glass cup is flat. Even in metal cups, the inner surface is often polished like a mirror surface, but in recent years, irregularities are left as they are or polished to some extent to leave irregularities.

  The finishing of the inner surface of a metal cup is generally performed by buffing (rotary polishing) or precision machining finishing (rotary cutting) of about # 400, for example. The finishing (polishing) direction is the circumferential direction from the processing method. Therefore, in the case of machining, fine irregularities are formed in a horizontal ring shape. In addition, since these processing methods are processing methods for forming a smooth surface, it is difficult to reproduce the unevenness. Alternatively, when the unevenness is left without polishing up to the mirror surface, the unevenness that is originally present has no regularity, and therefore the remaining unevenness is not reproducible and is uneven.

  For example, in Patent Document 1, a number of counterbore holes are formed on the beer mug made of an aluminum alloy from the outside, and fine holes that penetrate the bottom surface of the counterbore hole are formed. 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 is a laborious process. Moreover, even if a recess is provided, the state of foam generation changes depending on the state of the inner surface processing of the beer mug.

  Although it is not a drinking container, for example, Patent Document 2 describes a stainless steel shaker, and describes that a mirror finish is obtained by polishing the inner surface in the vertical direction.

JP 2011-200310 A Japanese Patent Laying-Open No. 2015-084999

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

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

  Invention of Claim 2 of this application is a drinking container characterized by the unevenness | corrugation formed in the inner side surface being formed in the up-down direction in the invention of Claim 1 of this application.

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

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

  According to the present invention, when foaming liquid is poured, fine foaming can be realized, and the time until the generated foam disappears 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 versus wavelength ratio with respect to the wavelength in each rank of F polishing and the conventional product. It is explanatory drawing (photograph) of the experiment example of the time-dependent change of the foam in the drinking container of this invention, and a conventional product. It is explanatory drawing of the comparative example of the magnitude | size of the foam in the drinking container of this invention, and a conventional product. It is explanatory drawing (photograph) of the comparative example of the magnitude | size of the foam in the drinking container of this invention, and a conventional product. It is explanatory drawing (photograph) of an example of the time-dependent change of the magnitude | 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 magnitude | size of the foam in a conventional product. It is explanatory drawing of an example of the time-dependent change of the magnitude | size of the foam in the drinking container of this invention, and a conventional product. It is explanatory drawing of an example of the 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 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 double-structured drinking container composed of a plate material that becomes the outer surface 4 and a plate material that becomes the inner side surface 2 and the inner bottom surface 3. However, the present invention is not limited to this, and a single layer structure in which one surface of the plate material is the outer surface 4 and the other surface is the inner surface 2 and the inner bottom surface 3 may be used. It goes without saying that various modifications such as a structure with a handle are possible.

  At least the inner surface 2 of the main body 1 is provided 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 examples to be described later, it is possible to generate small bubbles, generate bubbles of a uniform size, and increase the duration of the bubbles. . This unevenness will be described later using measurement results.

  Further, in the drinking container of the present invention, at least the inner side surface 2 is processed, but in the drinking container, the area of the inner side surface 2 is larger than the area of the inner bottom surface 3, and the generated foam is generated on the inner side surface 2. A large number of uniform small bubbles. In addition, the unevenness | corrugation to form is good to be an unevenness | corrugation extended in an up-down direction (direction which connects an opening part and the inner bottom face 3). Bubbles generated on the inner surface 2 are likely to rise to the liquid surface along the unevenness in a small state. Of course, there may be a portion where the inner surface 2 is not processed.

  The inner bottom surface 3 may have the same unevenness as the inner surface 2 or may be a flat surface. For example, if it is a metal drinking container, you may make it a mirror surface finish, or may form an unevenness | corrugation by hairline processing. Since the area of the inner bottom surface 3 is smaller than the area of the inner side surface 2 as described above, it is considered that the influence of the inner side surface 2 is dominant. Of course, it is desirable to form irregularities on the inner bottom surface 3 so that bubbles of a size that is not so different from the size of bubbles generated from the inner surface 2 are generated.

  The processing of the outer surface 4 is arbitrary. For example, in the case of a metal drinking container, the metal surface may be used as it is, may be mirror-finished by buffing or the like, may be subjected to machining such as hairline processing, or may be given a pattern. Good. Moreover, you may give the process of covering with another member. If it is a drinking container of another material, what is necessary is just to process according to the material, and combined use with another member is also possible.

  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-described irregularities on at least the inner surface 2. This method is described in the same document as a technique for preventing the powder from adhering to the metal surface, but the processing of the drinking container has not been considered. In this F polishing, the metal surface is polished by using an abrasive in which hard abrasive particles such as diamond, which do not lose sharpness even when the polishing operation is advanced, are attached to paper or cloth. Ranks are classified according to the nominal roughness of the abrasive particles, and “F-3” (# 40), “F-2” (# 60), “F-1” (# 120). In addition, F polishing ranks F0, F1,. . . Although there are F7 and the like, as will be described later, F-3, F-2, and F-1 are suitable as the rank of F polishing processing for drinking containers.

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

  There are various processing methods other than F polishing, but F polishing can be performed more easily than laser processing and precision machining, and an inexpensive apparatus can be provided. In addition, as compared with hairline processing or blasting, the unevenness can be given reproducibility, and a stable product with reduced product variation can be manufactured. Of course, any processing method capable of realizing the present invention is not excluded.

The wave number analysis using Fourier transform was tried about the unevenness | corrugation formed by the above-mentioned F grinding | polishing. By this analysis, the features of the surface irregularities can be quantified, and specifically, the distance between the irregularities at what intervals can be expressed numerically. Regarding the uneven shape of the steel sheet surface by F polishing of several ranks of F polishing, the following formula (1)
X (k) = Σ _{n = 0} ^N−1 x (n) · exp (−2πknj / N) (1)
Was subjected to discrete Fourier transform to analyze the relationship between the wavelength (irregularity pitch) component L and the wave height (amplitude: unevenness height) component H. For comparison, Fourier analysis was also performed on a conventional product whose inner surface was polished to some extent, and compared with F polishing. In equation (1), x (n) is the height measured by the probe sensor at a predetermined sampling interval when the steel plate surface is scanned in the predetermined length (distance) direction by the probe sensor. The value of the direction (represents surface irregularities), that is, the nth digital sampling value in the total sampling number N. K is a value corresponding to the wave number per unit length (spatial frequency) f [times / μm] (k = 0, 1, 2,..., N−1), and the total measurement distance is D [μm]. Then, k = fD.

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

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

  Referring to the analysis result shown in FIG. 2, a clear difference appears in each graph in the range where the wavelength L is 1 μm or less. When the wavelength L is in the range of 1 μm or less, when the 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 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 any case, the wave height to wavelength ratio in the range where the wavelength L was 1 μm or less was 0.03 or less.

  The comparative experiment about the magnitude | size and duration of the foam which generate | occur | produced about the drinking container in the case where the rank of F grinding | polishing mentioned above is F-3, F-2, and F-1 and a conventional product was conducted. When a foaming liquid is poured into a drinking container, bubbles are generated from the liquid. The bubbles can provide a refreshing feeling or a refreshing feeling when drinking a liquid. In particular, 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 foam covers the liquid surface, thereby blocking the liquid surface from contact with air and suppressing 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 the change over time of foam 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 unevenness remains in the circumferential direction (horizontal direction). (B)-(D) are the drinking containers of the present invention, and in the longitudinal direction with respect to the inner surface 2, (B) is F polishing with a rank of F-1, and (C) is F- F polishing processing of 2 is performed, and (D) is F polishing processing of rank F-3. Hereinafter, an example of a drinking container of the present invention that has been subjected to F polishing processing of rank F-1 is an F-1 container, and an example of a drinking container of the present invention that has been subjected to F polishing processing of rank F-2 is F-2. An example of a drinking container of the present invention that has been subjected to F polishing with a container and rank F-3 will be referred to as an F-3 container.

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

  When the liquid level of beer is observed with the conventional product shown in (A) and further observation is continued, at the time when 120 seconds have passed, the F-1 container and F- shown as (B) and (D) at last. The liquid level of beer is observed for three containers. About F-2 container shown as (C), the liquid level of beer is observed when 240 seconds have passed.

  Thus, in the drinking container of the present invention, it can be seen that the foam is clearly continued for a long time as compared with the conventional product. In particular, for the F-2 container shown as (C), the state where 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 compared to the conventional product, and the deterioration of the taste can be suppressed.

  Further, as can be seen with reference to FIG. 2, when comparing the wave height to wavelength ratio when the wavelength is 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) continues, and the conventional product has a smaller value than these. Comparing the value of the wave height to wavelength ratio when the wavelength is 1 μm or less and 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 bubble duration. As described above, in any of the F-3 container, the F-2 container, and the F-1 container, the value of the wave height to wavelength ratio when the wavelength is 1 μm or less is 0.005 or more. Longer bubble duration than conventional products can be ensured.

  FIG. 4 and FIG. 5 are explanatory diagrams of comparative examples of foam sizes in the drinking container of the present invention and the conventional product. In the figure, 11 is a transparent resin plate. In order to observe the actually generated foam, 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.

  FIG. 5A shows a case where the conventional product used in the experiment of FIG. 3 is cut in half, and FIG. 5B shows the drinking container of the present invention used in the experiment of FIG. The case where the F-2 container, which was the most successful, was cut in half and used. In both cases, the state immediately after pouring beer is shown. Comparing the two, the conventional product shown in FIG. 5A contains large bubbles in the bubble portion, whereas the F-2 container shown in FIG. 5B generates uniform bubbles. You can see what is going on. Of course, although the influence of the transparent resin plate 11 cannot be denied, since both of the influences exist, it is considered that the difference in the generated foam is due to the unevenness formed on the inner side surface 2 and according to the drinking container of the present invention. In other words, it can be said that many substantially uniform bubbles are generated.

  In this state, with respect to the bubbles present at the boundary with the liquid surface, the diameter of the bubbles was measured using a microscope. FIG. 4B shows the measurement results and the average of four bubbles with different positions. 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. It can be seen that small bubbles are generated compared to the conventional product. From this, it can be said that the foam which generate | occur | produces in the drinking container of this invention is small compared with a conventional product. When the liquid to be poured is beer, the smaller the foam, the better the creamy taste. Moreover, since the dispersion | variation in the diameter of the foam which generate | occur | produces in F-2 container is small compared with a conventional product, it can be said that the drinking container of this invention generate | occur | produces a more uniform foam than a conventional product.

In general, the pressure P in the bubbles is larger than the atmospheric pressure P0, and the following equation (Young-Laplace equation) is obtained using the surface tension γ of the liquid and the radius R of the bubbles.
P = P0 + 4γ / R
It is represented by The smaller the bubble diameter (the smaller the bubble radius R), the greater the pressure P inside the bubble. Therefore, if the sizes of the adjacent bubbles are different, the small bubbles are merged with the large bubbles due to the difference in internal pressure, are absorbed and become large, and the bubbles are easily broken. That is, the lifetime of the foam is shortened. On the other hand, when the bubbles are uniform, adjacent bubbles are difficult to coalesce, and the lifetime of the bubbles is prolonged. Therefore, by generating as uniform bubbles as possible, the life of the generated bubbles can be extended.

  As can be seen from the above-described experiment, in the drinking container of the present invention, the sizes of the generated bubbles are uniform, and the duration is longer than that of the conventional product. This is consistent with the theoretical finding that, as described above, the coalescence of bubbles is difficult to occur and the lifetime of the bubbles is prolonged. In the conventional product, since the unevenness formed on the inner surface 2 is uneven, it is considered that the size of the generated bubbles is uneven. By adjoining such irregular bubbles, it is presumed that the coalescence of the bubbles is promoted as described above, and the disappearance of the bubbles due to rupture occurs at an early stage, and therefore the disappearance of the bubbles is accelerated.

  FIG. 6, FIG. 7, and FIG. 8 are explanatory views of an example of the change over time of the foam size 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 with time of the foam from the state shown in FIG. 5 was examined. As described above, since the time until the bubbles disappear is longer as the sizes of the bubbles are aligned, it can be assumed from this experiment that the drinking container of the present invention has a longer duration of bubbles. In this case as well, the conventional product was compared with 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. Moreover, the measurement result of the diameter of the bubble which changes with time is collectively shown in FIG.

  In this experiment, as shown in FIG. 7, in the case of the conventional product, foam equivalent to the foam generated when pouring beer remains on the liquid surface until 60 seconds, but thereafter the transparent resin Only bubbles remaining on the plate remained. On the other hand, in the case of the F-2 container, as shown in FIG. 6, almost uniform bubbles are present on the liquid surface even after 120 seconds have elapsed, and bubbles are present on the liquid surface even after 180 seconds have elapsed. I understand that Thus, also in cross-sectional observation, in the drinking container of the present invention, almost uniform bubbles are present for a long time compared to the conventional product, and the liquid surface can be prevented from touching the 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 conventional products, 23 adult men and women aged 23 to 65 years old feel crisp, For each item of feeling and creamy feeling, we asked them to answer which container applies, and tabulated. The feeling of crispness is a feeling of coldness, good throatiness, and a feeling that disappears and does not remain in the mouth. Moreover, the feeling of schwarzwa indicates that the stimulation of carbonic acid is firmly felt. In addition, the creamy feeling is mild and easy to drink.

  Referring to the test results, it can be seen that the drinking container of the present invention is selected by many subjects in comparison with the conventional product in terms of sharpness and creamy feeling. As mentioned above, the creamy feeling represents a mild and easy-to-drink feeling, and the generated foam is related to the fineness. As can be seen from the experiments described above, it is considered that the drinking container of the present invention produces finer foam than the conventional product, which gives a creamy feeling. Also, the goodness of the crisp represents coldness, throatiness, and a feeling that does not remain in the mouth as described above, but in the drinking container of the present invention, fine bubbles are uniformly generated compared to the conventional product, so the crispness is felt. It is thought that it is directing.

  On the other hand, there were more subjects who felt a swoosh feeling with the conventional product. As described above, the feeling of swooshing shows that the carbonic acid feels firm, but this is because the foam produced by the conventional product is larger and uneven, so that the foam immediately blows in the mouth, This is thought to be the stimulation of carbonic acid.

  Thus, from the result of the sensory test shown in FIG. 9, the drinking container of the present invention has a significant result regarding the taste as compared with the conventional product. This is considered to be caused by the difference in the inner surface processing of the drinking container, and it was confirmed that the inner surface processing in the drinking container of the present invention also affects the taste.

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

  In addition, as a conventional product, a drinking container whose inner surface is mirror-finished is also used. In this case, the size and duration of the foam are the same as those of the conventional product described above, and bubbles with different sizes are generated. The duration was also short compared to the drinking container of the present invention. In addition, in the glass drinking containers that have been used conventionally, the duration is shorter than the metal conventional products described above, and bubbles with different sizes are generated, of course, compared with the drinking containers of the present invention. Is also inferior. Also in the sensory test, when these products were compared with the drinking container of the present invention, the drinking container of the present invention was more crisp and creamy.

  In the above experiment, the drinking container of the present invention was obtained by performing F polishing on the inner side surface 2. However, the present invention is not limited to this, and it goes without saying that the processing having the above-described characteristics may be performed using other processing methods such as laser processing and precision machining. In addition, as for the material of the drinking container, metal is used in the above-described example. However, the material is not limited to this, and various materials can be used as long as the inner surface 2 can be processed with the above-described characteristics, such as glass, resin, and ceramics. It may be a material. Of course, it goes without saying that the metal may be various metals such as titanium, copper, tin, etc., in addition to commonly used stainless steel. Furthermore, the inner surface 2 after molding has the above-described characteristics even in a drinking container molded using a mold or the like, or a drinking container in which at least the inner surface is post-processed using a mold. Needless to say, it is included in the present invention.

  Furthermore, you may perform the process which forms an unevenness | corrugation in the inner surface 2 mentioned above partially. For example, the above-described processing may be performed from the inner bottom surface 3 of the inner surface 2 to a predetermined height, and the above-described unevenness may be formed on a part of the inner surface 2. Thus, when unevenness is formed on a part of the inner surface 2, the material may be unified for the entire drinking container as in the above example, but the material other than the region where the unevenness is formed is changed to another material. May be. Hereinafter, an example of this case is shown as a modification.

  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 is shown in which different materials are used in the upper and lower parts of the drinking container.

  By using various processing methods such as F polishing for at least the inner surface 2 of the lower part of the drinking container as the metal part 21, irregularities having an average wavelength-to-wave height ratio of 0.005 or more are obtained in a wavelength range of 1 μm or less. Is formed. Of course, the inner bottom surface 3 may be processed. 10A shows an example in which the inner bottom surface 3 is configured as a plane, and FIG. 10B shows a configuration example in which the inner bottom surface 3 is hemispherical. In the configuration shown in FIG. 10B, the above-described unevenness may be formed from the inner side surface 2 to the inner bottom surface 3. Of course, the above-described unevenness may not be formed on the entire inner bottom surface 3, and the above-described unevenness may not be formed on the entire inner side surface 2 in any example. Further, the above-described unevenness may be formed on a part of the inner surface 2 of the metal part 21 or in part. In addition, the metal used as the metal part 21 may be various metals such as titanium, copper, and tin in addition to generally used stainless steel.

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

  In the 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 part 22 is made transparent, it is possible to observe bubbles rising in the liquid by the user and fine bubble layers covering the liquid surface. In beer or the like, the golden color of the liquid portion and the contrast between the golden color and white foam can be observed. As a result, it is possible to drink beverages while enjoying them visually, and to stimulate the desire for eating and drinking. Of course, the glass portion 22 does not need to be transparent, and may be colored glass, translucent or opaque glass, or may be decorated. Even in these cases, the designability can be improved. Of course, the material different from the metal portion 21 is not limited to glass, and may be plastic or other materials.

  FIG. 11: is sectional drawing which shows the 2nd modification of one Embodiment of the drinking container of this invention. In this 2nd modification, the example which used a different material for the lower part of the inner surface 2 of a drinking container is shown. In the example shown in FIG. 11, the metal part 21 is arranged on the bottom of the glass drinking container, and the lower part of the inner bottom surface 3 and the inner side surface 2 of the drinking container is the metal part 21.

  The metal part 21 has at least an inner surface 2 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 various processing methods such as F polishing. . Of course, the inner bottom surface 3 may be processed, or the inner side surface 2 may be unprocessed. The metal part 21 is joined to the glass part 22 at the periphery. The joining method is arbitrary, but for example, bonding may be performed. In addition, about the metal used as this metal part 21, various metals, such as titanium, copper, tin other than stainless steel generally used, may be used.

  Even in the 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 part 22 is made transparent, it is possible to observe a bubble rising by the user in the liquid and a fine bubble layer covering the liquid surface. In beer or the like, the golden color of the liquid portion and the contrast between the golden color and white foam can be observed. As a result, it is possible to drink beverages while enjoying them visually, and to stimulate the desire for eating and drinking.

  Of course, the glass part 22 does not need 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 properties are deteriorated. In order to eliminate such inconvenience, the glass part 22 may be made opaque or semi-transparent for the part where the bonding between the glass part 22 and the metal part 21 is visually recognized. As an example, blasting or the like may be performed from the outside of the glass portion 22. Transparent glass becomes clouded by the blasting process, and the joint part between the metal part 21 and the glass part 22 becomes difficult to see from the outside, and it is possible to prevent the deterioration of the designability and to improve the designability by the blasting process. . Of course, the same effect can be obtained by using a glass having a transparent lower portion and a transparent upper portion and having a gradation or a decoration on the lower portion. Of course, the glass portion 22 may be made of plastic or other material as a material different from that of the metal portion 21.

  Also in each of the above-described modifications, F-grinding 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 part 21 did. However, the present invention is not limited to this, and it goes without saying that processing having the above-described characteristics may be performed using other processing methods such as laser processing and precision machining.

  Further, in each of the above-described modifications, glass and metal are used as the material of the drinking container, but the portion that does not provide the unevenness, for example, the material used in place of the glass portion 22 is arbitrary, the portion that forms the unevenness, For example, the material used in place of the metal portion 21 may be various materials as long as the material can form irregularities having the above-described characteristics, such as glass, resin, and ceramics. Furthermore, the inner surface 2 after molding has the above-described characteristics even in a drinking container in which irregularities are formed using, for example, a mold, or at least the inner surface is post-processed using a mold. Needless to say, it is included in the present invention.

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

Claims (4)

  A drinking container characterized in that at least an inner side surface has irregularities having an average wavelength-to-wave height ratio of 0.005 or more 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 a vertical direction.   3. The drinking container according to claim 1, 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 in a region other than the region where the irregularities are formed.

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