Method for manufacturing stemware, and stemware

Abstract

This invention provides a method for manufacturing stemware that allows for optical effects, is easy to manufacture, and is durable despite being made of glass. [Solution] A glass reservoir 11 is formed at the bottom of the ball portion 1, a white glass C is inserted into the glass reservoir 11, and then the glass reservoir 11 is stretched along the longitudinal direction of the white glass C to form a stem portion 2. After that, a plate portion 3 is formed at the end of the stem portion 2 to manufacture the stemware A.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing stemware and stemware. Specifically, it relates to a method for manufacturing stemware that enables optical effects, can be easily manufactured, and is difficult to break despite being made of glass, and to the stemware.

Background Art

[0002] Stemware refers to a drinking glass provided with a handle at the bottom of the glass, and generally corresponds to a wine glass or a champagne glass. Stemware is composed of a bowl portion into which a beverage is poured, a stem portion that serves as a handle, and a plate portion that serves as a base.

[0003] Here, wine, champagne, etc. are daily beverages and are also enjoyed at festive occasions such as celebrations and parties, so they are often placed on a colorfully decorated table.

[0004] However, many stemwares are not only simple in shape but are formed of a single material of transparent glass, lacking in elegance. Therefore, they have an appearance that is not suitable for a party or the like.

[0005] Therefore, in order to solve this problem and optically create an atmosphere, as shown in Patent Document 1, a "light-emitting glass" in which a light-emitting member is assembled in the stem portion is disclosed. That is, this light-emitting glass is one in which a light-emitting member using a chemiluminescent agent as a light source is arranged in the stem portion.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, the light-emitting glass described in Patent Document 1 requires the stem to be hollow in order to insert the light-emitting element, making it difficult to manufacture from glass material. Furthermore, it was difficult to ensure sufficient strength in the hollow stem section, and even if it could be manufactured, it would be extremely fragile.

[0008] While manufacturing the luminescent glass described in Patent Document 1 (luminescent glass having a hollow stem) from a material other than glass (for example, plastic) would facilitate manufacturing and ensure strength, plastic materials would be inferior to glass in terms of gloss and brilliance.

[0009] This invention was conceived in view of the above points, and aims to provide a method for manufacturing stemware that allows for optical effects, can be manufactured simply, and is resistant to breakage despite being made of glass, as well as stemware itself. [Means for solving the problem]

[0010] To achieve the above objective, the present invention provides a method for manufacturing stemware, comprising: a ball portion forming step of forming a ball portion of a predetermined shape having a glass reservoir portion made of molten transparent glass at its bottom; an insertion step of inserting colored glass into the glass reservoir portion; a stem portion forming step of melting the colored glass inserted into the glass reservoir portion and then stretching the glass reservoir portion with the colored glass contained within to form a stem portion; and a plate portion forming step of attaching molten transparent glass to the end of the stem portion to form a plate portion of a predetermined shape.

[0011] Here, a ball-shaped portion is formed in a ball-shaped portion having a glass reservoir made of molten transparent glass at the bottom. This process forms a glass reservoir at the bottom of the ball-shaped portion, which serves as a base for inserting colored glass in the insertion process described later.

[0012] Furthermore, by inserting colored glass into the glass reservoir, the colored glass can be placed inside the transparent glass of the glass reservoir (the transparent glass of the glass reservoir can contain the colored glass). In this context, "encompassing" does not only refer to cases where "all" of the colored glass is placed inside the glass reservoir, but also includes cases where "part" of the colored glass is placed inside the glass reservoir (i.e., where "another part" of the colored glass is placed outside the glass reservoir).

[0013] Furthermore, after melting the colored glass inserted into the glass reservoir, a stem forming process is performed in which the glass reservoir, with the colored glass still inside, is stretched to form the stem. This process creates a stem at the bottom of the ball portion that has a central part made of colored glass and a peripheral part made of transparent glass arranged around the central part.

[0014] Here, the stem, which consists of a central part made of colored glass and a peripheral part made of transparent glass arranged around the central part, appears to glow when light is shone from above (specifically, the colored glass itself appears to emit light). Furthermore, the "stem section, which consists of a central part made of colored glass and a peripheral part made of transparent glass arranged around the central part," gives the stem section a special aesthetic appeal and creates a sense of elegance even when no light is shone on it.

[0015] On the other hand, if the stem is made of "colored glass only" (without clear glass) or if the stem is made of "clear glass only" (without colored glass), it will be difficult to see the stem glowing even when light is shone from above. Furthermore, if the stem is made of "colored glass only" (without clear glass) or "clear glass only" (without colored glass), even when not illuminated, the stem has a simple structure (colored glass only, clear glass only) and cannot create an elegant appearance.

[0016] Furthermore, by stretching the glass reservoir while it contains colored glass (in other words, by stretching the glass reservoir while it is solid), the stem can be formed relatively easily (at least, it is easier to form the stem compared to forming a hollow stem).

[0017] Furthermore, by extending the glass reservoir at the bottom of the ball section to form the stem section (in other words, by forming the stem section integrally with the ball section), it is possible to obtain a beautiful stemware with a morphological unity, as there is no joint (seam) between the ball section and the stem section.

[0018] Furthermore, if the "ball portion of a predetermined shape" and the "stem portion of a predetermined shape" are manufactured separately and then joined together, the joint (seam) will be noticeable, and the joint will become larger (thicker), thus compromising the overall integrity of the form.

[0019] Furthermore, by forming a plate portion in a plate portion formation process, in which molten transparent glass is attached to the end of the stem portion to form a plate portion of a predetermined shape, the plate portion can be formed integrally with the stem portion. As a result, there is no joint (seam) between the stem portion and the plate portion, and a beautiful stemware with a unified form can be obtained.

[0020] In addition, when the "stem portion of a predetermined shape" and the "plate portion of a predetermined shape" are manufactured separately and then joined together, the joint (seam) becomes prominent and the joint portion becomes large (thick), so the morphological integrity will be impaired.

[0021] Also, when the insertion process inserts white glass, which is a colored glass containing sodium fluorosilicate, at a ratio of 1.3 wt% to 3.5 wt% with respect to the weight (total weight) of the transparent glass, a "stem portion having a central portion made of white glass and a peripheral portion made of transparent glass and arranged around the central portion" can be formed, and when light is applied from above, the stem portion appears to shine even more.

[0022] In addition, when light is applied from above in a state where a beverage (for example, wine) is poured into the ball portion, light reflecting the color of the beverage will enter the stem portion. However, when the central portion is "white glass", the stem portion appears to emit light in the color of the beverage (specifically, the white glass itself appears to emit light in the color of the beverage).

[0023] Here, when the ratio of sodium fluorosilicate is less than 1.3 wt% with respect to the weight (total weight) of the transparent glass, the white glass becomes too close to colorless and transparent (the degree of whiteness is too low), and the transmittance of the white glass becomes too high. As a result, diffuse reflection of incident light in the white glass hardly occurs, and the stem portion is difficult to see shining.

[0024] On the other hand, when the ratio of sodium fluorosilicate exceeds 3.5 wt% with respect to the weight (total weight) of the transparent glass, the white glass becomes too close to white (the degree of whiteness is too high), and the transmittance of the white glass becomes too low. As a result, it becomes difficult for incident light to enter the white glass, and the stem portion is difficult to see shining.

[0025] In addition, when the insertion process involves inserting a white glass, which is a colored glass containing sodium fluorosilicate, at a ratio of 2.0 wt% to 3.5 wt% with respect to the weight (total weight) of the transparent glass, it becomes easier to form the white glass linearly within the stem portion.

[0026] Here, when the ratio of sodium fluorosilicate is less than 2.0 wt% with respect to the weight (total weight) of the transparent glass, when forming the stem portion by stretching the glass pool portion with the colored glass (white glass) enclosed, the white glass is likely to be distorted irregularly and gather into a distorted shape.

[0027] Note that the larger the ratio of sodium fluorosilicate, the less likely the white glass is to be distorted irregularly and gather, and it can be finished into a straight and beautiful axis. However, as described above, when the ratio of sodium fluorosilicate exceeds 3.5 wt% with respect to the weight (total weight) of the transparent glass, the stem portion becomes shiny and difficult to see.

[0028] In addition, when the insertion process involves inserting a colored glass in the form of a rod into the glass pool portion, and the stem portion forming process involves stretching the glass pool portion in the longitudinal direction of the colored glass in the form of a rod to form the stem portion, it becomes easier to stretch the glass pool portion linearly, and the formation of the stem portion becomes relatively easy.

[0029] For example, by arranging the colored glass at the central portion of the glass pool portion (the central portion in the plane perpendicular to the longitudinal direction of the colored glass) so that the "longitudinal direction of the colored glass" coincides with the "tensile direction of the glass pool portion", and focusing on making the colored glass form a straight line, the glass pool portion can be easily stretched linearly.

[0030] In addition, when the insertion process involves heating a colored glass in the form of a rod to such an extent that its form can be maintained, and then inserting the colored glass into the glass pool portion, the colored glass can be easily inserted into a desired position (for example, the central portion in the plane perpendicular to the longitudinal direction of the colored glass), and after insertion, the glass pool portion can be stretched. In other words, because the colored glass is in the form of a rod, it can be easily inserted into the desired position. Furthermore, the colored glass is preheated (but only to the extent that it can maintain its shape), and after being inserted into the glass reservoir (molten clear glass), heat transfer from the glass reservoir is added, causing the colored glass to melt sufficiently, and the glass reservoir can be stretched after insertion.

[0031] Furthermore, if the stem formation process involves heating the glass reservoir where the colored glass is inserted, and then stretching the glass reservoir to form the stem, even if the colored glass inserted into the glass reservoir is not fully melted, the transparent glass and colored glass can be heated together and maintained at an appropriate temperature during the process, making it easy to stretch both the transparent glass and the colored glass.

[0032] Furthermore, in order to achieve the above objectives, the stemware of the present invention comprises a ball portion made of transparent glass, a central part made of colored glass that supports the ball portion, a stem portion arranged around the central part and having a peripheral part made of transparent glass, and a plate portion made of transparent glass on which the stem portion is erected, wherein the colored glass is white glass containing sodium siliceous fluoride in a proportion of 1.3 wt% to 3.5 wt% relative to the weight of the transparent glass.

[0033] Here, the stem consists of a central part made of white glass containing sodium silica fluoride at a ratio of 1.3 wt% to 3.5 wt% relative to the weight (total weight) of the transparent glass, and a peripheral part made of transparent glass arranged around the central part. When light is shone from above, the stem appears to glow (specifically, the white glass itself appears to emit light).

[0034] Furthermore, when a beverage (for example, wine) is poured into the bowl and light is shone from above, the light reflecting the color of the beverage enters the stem. However, because the center is made of "white glass," the stem appears to emit light in the color of the beverage (specifically, the white glass itself appears to emit light in the color of the beverage).

[0035] Furthermore, the "stem section, which consists of a central part made of white glass and a peripheral part made of transparent glass arranged around the central part," gives the stem section a special aesthetic appeal and creates a sense of elegance, even when no light is shone on it.

[0036] In this case, if the proportion of sodium siliceous fluoride relative to the weight (total weight) of the transparent glass is less than 1.3 wt%, the white glass becomes too close to colorless and transparent (too little white), and the transmittance of the white glass becomes too high. As a result, diffuse reflection of incident light within the white glass becomes difficult, and the stem becomes less visible as a reflection.

[0037] On the other hand, if the proportion of sodium siliceous fluoride relative to the weight (total weight) of the transparent glass exceeds 3.5 wt%, the white glass becomes too close to white (too white), and the transmittance of the white glass becomes too low. As a result, incident light has difficulty penetrating the white glass, and the stem becomes difficult to see through. [Effects of the Invention]

[0038] The method for manufacturing stemware according to the present invention allows for optical presentation, is easy to manufacture, and produces stemware that is resistant to breakage despite being made of glass. Furthermore, the stemware according to the present invention allows for optical effects, can be easily manufactured, and is resistant to breakage despite being made of glass. [Brief explanation of the drawing]

[0039] [Figure 1] This is a schematic diagram illustrating an example of stemware to which the present invention is applied. [Figure 2] This is a process diagram of an example of a method for manufacturing stemware using the present invention. [Figure 3] This is a schematic diagram illustrating the ball-forming process. [Figure 4] This is a schematic diagram to explain the insertion process. [Figure 5] This is a schematic diagram illustrating the stem formation process. [Figure 6] This is a schematic diagram illustrating the plate formation process. [Modes for carrying out the invention]

[0040] The following describes embodiments for carrying out the invention (hereinafter referred to as "embodiments"). The description will be given in the following order. 1. First Embodiment 2. Second Embodiment 3. Variant

[0041] <1. First Embodiment> [Explanation of the structure] Figure 1 is a schematic diagram illustrating an example of stemware to which the present invention is applied. The Stemware A shown here consists of a bowl portion 1 into which the beverage is poured, a stem portion 2 that extends continuously from the bottom 10 of the bowl portion 1 to support the bowl portion 1 and serves as a handle when using Stemware A, and a disc-shaped plate portion 3 on which the stem portion 2 is erected and which supports the bowl portion 1 and the stem portion 2.

[0042] The ball section 1 is made of transparent glass G, has a height of approximately 110 mm, a diameter of approximately 80 mm at the lower overhang, and a mouth diameter of approximately 55 mm, and is formed in a shape that gradually narrows towards the top.

[0043] The stem portion 2 consists of a central part 20 made of white glass C and a peripheral part 21 made of transparent glass G, with the peripheral part 21 covering the outside of the central part 20. It is formed in a roughly cylindrical shape with a length of approximately 100 mm and a diameter of approximately 4.5 mm (of which the diameter of the central part 20 is 1.5 mm to 2.5 mm).

[0044] The plate section 3 is made of transparent glass G and is formed in the shape of a disc with a height of approximately 10 mm and a diameter of approximately 80 mm.

[0045] Here, the transparent glass G that constitutes the ball portion 1, the peripheral portion 21 of the stem portion 2, and the plate portion 3 contains the components shown in Table 1.

[0046] [Table 1]

[0047] Furthermore, the white glass C that constitutes the central part 20 of the stem 2 contains, in addition to the components of the transparent glass G described above, the white pigment "sodium siliceous fluoride". Specifically, the transparent glass G contains sodium siliceous fluoride at a rate of 3.0 wt% relative to its total weight.

[0048] [effect] In the Stemware A to which the above-described invention is applied, when a translucent beverage W (for example, red wine) is poured into the ball portion 1 and light L is shone from above, the color of the beverage W (red in the case of red wine) is reflected in the light L' that passes through the ball portion 1. Then, the light L' that has passed through the ball portion 1 (light reflecting the color of the beverage W) enters the central part 20 of the stem portion 2, and the central part 20 appears to emit the color of the beverage W, thus enabling optical effects.

[0049] Specifically, the "light L' reflecting the color of beverage W" incident on the central part 20 is diffusely reflected within the central part 20, causing the central part 20 to exhibit the color of beverage W. Furthermore, the peripheral part 21 acts as a lens, making the color of the central part 20 easier to see, and as described above, the central part 20 appears to emit the color of beverage W.

[0050] Note that in Figure 1, for convenience, only light L from vertically above is shown. However, if light L from an oblique direction (a direction having a predetermined angle with the vertical axis) passes through the ball portion 1 and light L' from an oblique direction is incident on the central part 20, the central part 20 will similarly appear to emit the color of the beverage W.

[0051] Furthermore, in Stemware A to which the present invention is applied, the stem portion 2 is solid, making it easier to ensure strength compared to a hollow stem portion (for example, the stem portion of the light-emitting glass described in Patent Document 1). Therefore, a slender diameter of approximately 4.5 mm can be achieved, and combined with the optical effects described above, a special aesthetic can be given to the stem portion.

[0052] [Example 1] In the first embodiment described above, the explanation is given using the case where the transparent glass G contains the components shown in Table 1 as an example, but the invention is not limited to these components.

[0053] [Differentiation 2] Furthermore, in the first embodiment described above, white glass C containing sodium siliceous fluoride at a ratio of "3.0 wt%" relative to the weight (total weight) of transparent glass G is used as an example, but it is not necessarily limited to "3.0 wt%".

[0054] Table 2 shows the relationship between the "ratio of sodium silica fluoride to the weight (total weight) of transparent glass G" and the "transmittance".

[0055] [Table 2]

[0056] Table 2 shows that when the proportion of sodium silica fluoride relative to the weight (total weight) of transparent glass G is "1.0 wt% or less" or "1.2 wt%", the transmittance of the central part 20 exceeds 90%. When the transmittance exceeds 90%, diffuse reflection of incident light within the central part 20 is difficult to occur, resulting in poor color development in the central part 20.

[0057] Furthermore, Table 2 shows that when the proportion of sodium silica fluoride relative to the weight (total weight) of transparent glass G is "4.0 wt% or more", the transmittance of the central part 20 is 0%. When the transmittance is 0%, incident light cannot enter the central part 20, and the color development of the central part 20 is poor.

[0058] Therefore, the proportion of sodium siliceous fluoride relative to the weight (total weight) of transparent glass G does not necessarily have to be "3.0 wt%", but in order to produce good color in the center 20, it is preferable that it be "1.3 wt% to 3.5 wt%".

[0059] <2. Second Embodiment> The following describes the manufacturing method of the stemware A described above. Specifically, an example of a method for manufacturing stemware to which the present invention is applied will be described.

[0060] [Explanation of manufacturing method] Figure 2 is a process diagram of an example of a method for manufacturing stemware to which the present invention is applied, and stemware A is manufactured in steps (1) to (7). (1) Melting process (2) Ball part formation process (3) Insertion process (4) Stem formation process (5) Plate formation process (6) Annealing process (7) Finishing and inspection process

[0061] The following provides a detailed explanation of each of the above steps (1) to (7).

[0062] (1) Melting process In one example of a method for manufacturing stemware using the present invention, first, sodium oxide and the like are added to silica to obtain the component ratio of transparent glass G shown in Table 1, and then heated to 1250°C in a glass melting furnace (not shown) to melt it (see reference numeral ST1 in Figure 2).

[0063] After the transparent glass G has melted, a suitable amount of the molten transparent glass G is removed from the glass melting furnace using a blowpipe (a hollow rod-shaped object) B. Specifically, the transparent glass G is wound around one end of the blowpipe B, and a suitable amount of seed glass is removed from the glass melting furnace.

[0064] (2) Ball part formation process The 1250°C high-temperature glass (seed glass) removed from the glass melting furnace is cooled to approximately 800°C in about 90 seconds, and air is blown into the other end of the blowpipe B (the end opposite to the end on which the transparent glass G is wound) to form a hollow spherical shape from the wound transparent glass G.

[0065] Next, as shown in Figure 3, a hollow, spherical transparent glass G is placed in a mold M, and air is blown into it from the other end of the blowpipe B (in Figure 3, the symbol Br indicates "blowing air") to inflate the sphere and form a ball portion 1, and also form a glass reservoir portion 11 at the bottom of the ball portion 1 (see symbol ST2 in Figure 2).

[0066] (3) Insertion process After forming the ball portion 1 and the glass reservoir portion 11, the glass reservoir portion 11 is heated to a temperature of approximately 800°C using a gas burner, and as shown in Figures 4(a) and 4(b), 20mm to 30mm of the tip of a rod-shaped white glass C is inserted near the center of the glass reservoir portion 11 along the longitudinal direction of the white glass C.

[0067] Next, a gas burner is used to heat the boundary between the "inserted portion of the white glass C" and the "exposed portion of the white glass C (the portion that is not inserted)" to melt the white glass C, forming a state in which a white glass C approximately 20 mm to 30 mm in length is inserted into the glass reservoir 11, as shown in Figure 4(c) (see symbol ST3 in Figure 2).

[0068] (4) Stem formation process Starting with the white glass C inserted into the glass reservoir 11 (with the white glass C covered by transparent glass G), the stem portion 2 is formed by gradually stretching the glass reservoir 11 using a tool such as pincers D, as shown in Figure 5 (see reference numeral ST4 in Figure 2).

[0069] When the glass reservoir 11 is stretched, the white glass C inserted inside it is also stretched, and a stem portion 2 consisting of a central part 20 made of white glass C and a peripheral part 21 made of transparent glass G can be formed along its approximately entire length.

[0070] Furthermore, by stretching the glass reservoir 11 while paying attention to ensuring that the white glass C is stretched in a straight line, a relatively straight stem portion 2 can be formed.

[0071] (5) Plate formation process After forming the stem portion 2, as shown in Figure 6(a), molten transparent glass G (seed glass) is attached to the end of the stem portion 2 (the end opposite to the ball portion 1), and as shown in Figures 6(b) and 6(c), a disc-shaped plate portion 3 is formed by shaping it using a water-soaked wooden trowel E1, E2, etc. (see reference numeral ST5 in Figure 2).

[0072] Furthermore, since the central part 20, made of white glass C, extends to the end of the stem part 2 (the end opposite to the ball part 1), the position for attaching the seed glass can be easily determined.

[0073] (6) Annealing process After forming the plate portion 3, the stemware A is placed in an annealing oven at approximately 230°C, and the temperature of the oven is lowered to approximately 80°C to 90°C over approximately 3 hours, after which the stemware A is removed (see symbol ST6 in Figure 2). This annealing process can remove internal stresses from Stemware A, thereby improving the performance of the glass.

[0074] (7) Finishing and inspection process The finishing process involves removing the excess transparent glass G portion, polishing the opening of the ball portion 1 to make it flat, and then heating the opening of the ball portion 1 to approximately 300°C to smooth the edges (see symbol ST7 in Figure 2).

[0075] The inspection process involves checking for any overall scratches or distortions (see symbol ST7 in Figure 2). Furthermore, because the stem portion 2 has a central part 20 made of white glass C, it is easy to inspect whether or not a straight stem portion 2 has been formed.

[0076] [effect] In the method for manufacturing stemware to which the present invention described above is applied, the glass reservoir portion 11 formed in the ball portion forming step ST2 is stretched in the stem portion forming step ST4 to form the stem portion 2, thereby eliminating the joint (seam) between the ball portion 1 and the stem portion 2, and allowing the ball portion 1 and the stem portion 2 to be formed integrally.

[0077] Furthermore, by integrally forming the ball portion 1 and the stem portion 2, light L' (see Figure 1) transmitted through the ball portion 1 easily enters the stem portion 2, making the central part 20 appear to emit the color of the beverage W.

[0078] [Difference 3] In the second embodiment described above, the ball portion forming step ST2 is explained using as an example a method of forming the ball portion 1 by placing a spherical transparent glass G into a mold M (a so-called "molding method by mold blowing"). However, it is sufficient if the ball portion 1 and the glass reservoir portion 11 can be formed, and it is not necessarily required to use a mold M. For example, a method may be used in which air is blown into a blowpipe B while it is rotated in the air, without using a formwork M, to form the ball portion 1 and the glass reservoir portion 11 (a so-called "free-blowing" molding method).

[0079] [Differentiation Example 4] Furthermore, in the second embodiment described above, the insertion process involves inserting only the "tip portion" of the rod-shaped white glass C into the glass reservoir 11, and then melting the white glass C while leaving the tip portion (20mm to 30mm) in the glass reservoir 11. However, it is sufficient to form a state in which 20mm to 30mm of white glass C is inserted, and other methods may also be used. For example, a piece of white glass C with a total length of about 20mm to 30mm may be inserted into the glass reservoir 11.

[0080] [Difference 5] Furthermore, as shown in the modified example 2 above, the proportion of sodium silica fluoride relative to the weight (total weight) of transparent glass G is not necessarily limited to "3.0 wt%".

[0081] Table 3 shows the relationship between the ratio of sodium silica fluoride to the weight (total weight) of transparent glass G and the degree of distortion in the center 20. Table 3 also shows the transmittance and the degree of color development in the center 20 (the same information as in Table 2).

[0082] [Table 3]

[0083] Table 3 shows that when the proportion of sodium siliceous fluoride relative to the weight (total weight) of transparent glass G is "1.0 wt% or less", "1.2 wt%", "1.3 wt%", and "1.5 wt%", distortion occurs in the central part 20 (white glass C) during the stem formation process ST4.

[0084] Therefore, the proportion of sodium siliceous fluoride relative to the weight (total weight) of transparent glass G does not necessarily have to be "3.0 wt%", but in order to suppress distortion of the central part 20 (white glass C) and form it neatly and straight, it is preferable that it be "2.0 wt% or more". Furthermore, as described in Modification 2, in order to achieve good color development in the central part 20, it is preferable that the concentration be "1.3 wt% to 3.5 wt%". Therefore, in order to form the central part 20 (white glass C) neatly and straight, and to achieve good color development, it is preferable that the concentration is "2.0 wt% to 3.5 wt%".

[0085] <3. Variant> In the first and second embodiments described above, the case where the central part 20 is white glass C is used as an example for explanation, but the central part 20 does not necessarily have to be white and may be of a different color. However, in order to make the color of the beverage W more easily visible when the "light L' reflecting the color of the beverage W" incident on the stem portion 2 is diffusely reflected within the central portion 20, creating the effect that the central portion 20 is colored, it is preferable that the material be white (i.e., it is preferable that the material be white glass C containing a white pigment in transparent glass G). [Explanation of Symbols]

[0086] A Stemware B. Blowing pole C White glass G Transparent glass 1. Ball Department 10 bottom 11. Glass accumulation area 2 Stem section 20 Center 21 Peripheral area 3 Plate section

Claims

1. A ball-forming step involves forming a ball-shaped portion having a glass reservoir at the bottom made of molten transparent glass, The insertion process involves inserting colored glass into the aforementioned glass reservoir, A stem forming step is performed in which, after melting the colored glass inserted into the glass reservoir, the glass reservoir is stretched while containing the colored glass to form the stem, The process includes a plate forming step of attaching molten transparent glass to the end of the stem portion to form a plate portion of a predetermined shape. A method for manufacturing stemware.

2. The insertion process involves inserting the white glass, which is the colored glass containing sodium silicerite fluoride, in a ratio of 1.3 wt% to 3.5 wt% relative to the weight of the transparent glass. A method for manufacturing stemware according to claim 1.

3. The insertion process involves inserting the white glass, which is the colored glass containing sodium silicerite, in a ratio of 2.0 wt% to 3.5 wt% relative to the weight of the transparent glass. The method for manufacturing stemware according to claim 2.

4. The insertion step involves inserting the rod-shaped colored glass into the glass reservoir. The stem formation step involves stretching the glass reservoir portion in the longitudinal direction of the rod-shaped colored glass to form the stem portion. A method for manufacturing stemware according to claim 1 or claim 2.

5. The insertion process involves heating the rod-shaped colored glass to a degree that allows it to maintain its shape, and then inserting the colored glass into the glass reservoir. A method for manufacturing stemware according to claim 1 or claim 2.

6. The stem formation step involves heating the glass reservoir in which the colored glass is inserted, and then stretching the glass reservoir to form the stem. A method for manufacturing stemware according to claim 1 or claim 2.

7. The ball part is made of transparent glass, The ball portion is supported by a central part made of colored glass, and a stem portion is arranged around the central part and has a peripheral part made of transparent glass. The stem portion is erected, and the plate portion is made of transparent glass. The aforementioned colored glass is a white glass containing sodium siliceous fluoride in a proportion of 1.3 wt% to 3.5 wt% relative to the weight of the clear glass. Stemware.

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