Container and method for manufacturing container

Abstract

Provided is a container that is resistant to external force and heat despite the use of a pottery.　A cup (1A) serving as a container is provided with: an outer container part (2) having translucency; an inner container part (3) disposed inside the outer container part (2) at a gap therefrom and joined to the outer container part (2); and a pottery (5) movably disposed in an inner space (4) formed by the gap between the outer container part (2) and the inner container part (3).

Description

Container and method for manufacturing the container

[0001] The present invention relates to a container and a method for manufacturing the container.

[0002] Various ceramic containers have been proposed in the past. One example of such a container is one that is made of ceramic and a glass covering that is tightly attached to the entire outer surface of the ceramic (see Patent Document 1).

[0003] This conventional container allows the ceramic inside to be seen through the glass covering, which has the advantage that it is possible to express unique designs that cannot be expressed with other materials, and this can be seen.

[0004] JP 2011-63465 A

[0005] However, in the above-mentioned conventional example, because the ceramic and the glass covering are in close contact and fixed, there is a problem that the ceramic may be thermally damaged (breakage, discoloration, etc.) due to the difference in the thermal expansion coefficients of the two materials. Also, because the ceramic and the glass covering are in close contact and fixed, external force and heat from the glass covering act directly on the ceramic inside, making the ceramic susceptible to damage from external force and heat.

[0006] As mentioned above, ceramics can be used to create unique designs that cannot be achieved with other materials, and so there is a strong demand for the development of containers that combine ceramics with other materials and are resistant to external forces and heat. If such containers are developed, it is expected that the market will be revitalized and expanded not only in the ceramics industry but also in the materials industries that use ceramics together (for example, the glass industry).

[0007] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a container that is resistant to external forces and heat despite being made of ceramics, and a method for manufacturing such a container.

[0008] The present invention has been made in consideration of the above problems, and is a container characterized by comprising: a translucent outer container portion; an inner container portion arranged inside the outer container portion and joined to the outer container portion; and ceramics movably arranged in the internal space formed between the outer container portion and the inner container portion.

[0009] Another invention is a method for manufacturing a container, comprising: a parts fabrication process for fabricating an outer container part, an inner container part, and ceramics, respectively; a parts assembly process for assembling the outer container part and the inner container part in a temporarily joined state, with the ceramics placed in the gap between the outer container part and the inner container part; and a welding process for heating and welding the joint between the outer container part and the inner container part to form a joint.

[0010] According to the present invention, the ceramic is movable within the internal space enclosed by the outer and inner container parts and is not fixed to either the outer or inner container part, so it is not subject to thermal damage resulting from differences in the thermal expansion coefficients of the outer and inner container parts. Furthermore, compared to when the ceramic is in close contact with the outer or inner container part, the ceramic is not subjected to direct heat or external forces from the outer or inner container part, so damage from heat or external forces is suppressed. As a result, a container that is resistant to external forces and heat can be provided, despite using ceramic. Furthermore, ceramics can be used to express a wide variety of unique and elaborate designs that cannot be expressed with other materials, and a container can be provided in which the ceramic design can be seen through the outer container part.

[0011] The drawings show specific embodiments of the present invention according to the present disclosure, and include not only essential configurations of the invention but also optional and preferred embodiments. A first embodiment is shown, where (a) is a front view of a cup, and (b) is an enlarged view of portion Ib in (a). A first embodiment is shown, where (a) is a cross-sectional view of the cup. A first embodiment is shown, where (b) is an exploded perspective view of the cups before joining (welding). A second embodiment is shown, where (a) is a front view of the cup, and (b) is an enlarged view of portion IVb in (a). A second embodiment is shown, where (a) is a front view of the cup, and (b) is an enlarged view of portion VIIb in (a). A third embodiment is shown, where (a) is a front view of the cup, and (b) is an enlarged view of portion VIIb in (a). A third embodiment is shown, where (a) is a front view of the cup, and (b) is an enlarged view of portion VIIb in (a). A third embodiment is shown, where (b) is an exploded perspective view of the cups before joining (welding ...b) is an exploded perspective view of the cups before joining (welding). A third embodiment is shown, where (b) is an exploded perspective view of the cups. A third embodiment is shown, where (b) is an exploded perspective view of the cups before joining (welding). A third embodiment is shown, where (b) is an exploded perspective view of the cups. 1A shows a method for manufacturing a cup according to a second embodiment, where (a) is a plan view of the main parts of a processing device showing the cup welding step, and (b) is a view seen from the direction of arrow XIIb in (a). 1B shows a method for manufacturing a cup according to a second embodiment, where (a) is a front view of the main parts of a processing device showing the cup welding step, and (b) is a view seen from the direction of arrow XIIIb in (a). 1C shows a method for manufacturing a modified example of the cup according to the second embodiment, and is a schematic diagram illustrating the effects of heating by a burner flame, heat insulation of the flame by a carbon panel, and cooling by air blowing from an air blowing means.

[0012] Each embodiment will be described in detail below with reference to the accompanying drawings. In these embodiments, a description of already known technologies will be omitted. Furthermore, the following merely illustrates devices and methods for embodying the technical concept of the invention, and the technical concept of the present invention is not limited to the following. Various modifications can be made to the technical concept of the present invention within the scope of the claims. It should be noted that the drawings are schematic and may differ from the actual product.

[0013] A container is a container that can hold any content, such as food, solid matter, granular matter, fluid, etc. In this embodiment, a description will be given taking a cup for holding a drink, which is a fluid, as an example.

[0014] 1 to 3 show a first embodiment of the present invention. As shown in Fig. 1 to 3, a cup 1A serving as a container includes an outer container portion 2, an inner container portion 3 disposed inside the outer container portion 2 with a gap therebetween and joined to the outer container portion 2, and ceramic ware 5 movably disposed in an internal space 4 formed by the gap between the outer container portion 2 and the inner container portion 3.

[0015] The outer container portion 2 has a side portion 2a having a substantially truncated cone shape and a bottom portion 2b that closes the bottom surface of the side portion 2a, and the top surface of the side portion 2a is open.

[0016] The outer container 2 is made of translucent glass, meaning that the interior can be seen from the outside of the outer container 2. The inner container 3 has a side surface 3a that is slightly smaller in diameter than the outer container 2 and is substantially truncated cone-shaped, and a bottom surface 3b that closes the bottom of the side surface 3a, with the top surface of the side surface 3a being open.

[0017] The inner container part 3 is also made of a translucent glass, similar to the outer container part 2. In other words, the inside of the inner container part 3 can be seen from the inside.

[0018] The upper ends of the outer container part 2 and the inner container part 3 are set at the same height when they are stacked together, and are connected around their entire periphery by a joint 6. The joint 6 forms the drinking spout. As described below, the joint 6 is formed by fusing the upper ends of the outer container part 2 and the inner container part 3 by flame baking. Therefore, the surface of the joint 6 is formed into an arc shape by surface tension during the solidification process of the molten glass material (see Figure 1(b)).

[0019] As described above, both the outer container part 2 and the inner container part 3 are made of glass, more specifically, borosilicate glass.

[0020] The internal space 4 between the outer container portion 2 and the inner container portion 3 has a shape that is continuous between both side portions 2a, 3a and both bottom portions 2b, 3b.

[0021] The ceramic 5 has a truncated cone-shaped side portion 5a and a bottom portion 5b that closes the bottom of the side portion 5a. The ceramic 5 is arranged across the region of the internal space 4 of the side portions 2a, 3a of the outer container portion 2 and the inner container portion 3, and the region of the internal space 4 of the bottom portions 2b, 3b of the inner container portion 3 of the outer container portion 2.

[0022] The ceramic 5 is not fixed to either the outer container part 2 or the inner container part 3, but is arranged so as to be movable in the internal space 4. In this first embodiment, the ceramic 5 is arranged so as to be movable slightly in the vertical direction and slightly more in the horizontal (lateral) direction than in the vertical direction.

[0023] A design is displayed on the outer surface of the ceramic 5, but is not shown in the figure. The ceramic 5 is made of a material containing 60% or more of silica and feldspar (Na, K, Ca, Ba) (Si, Al) 408.

[0024] As described above, in the first embodiment, the cup 1A comprises a translucent outer container part 2, an inner container part 3 arranged inside the outer container part 2 with a gap therebetween and joined to the outer container part 2, and ceramics 5 arranged movably in the internal space 4 formed by the gap between the outer container part 2 and the inner container part 3.

[0025] Therefore, the ceramic 5 is movable into the internal space 4 surrounded by the outer container part 2 and the inner container part 3, and is not fixed to either the outer container part 2 or the inner container part 3, so it is not subject to thermal damage caused by the difference in thermal expansion coefficient between the outer container part 2 and the inner container part 3. In other words, if the ceramic 5 were fixed to the outer container part 2 or the inner container part 3, the difference in thermal expansion coefficient at the fixed part would cause thermal stress to act on the ceramic 5, which could result in damage (breakage, stress, etc.), but the ceramic 5 is not subject to such damage.

[0026] Furthermore, compared to when the ceramic 5 is in close contact with the outer container part 2 or the inner container part 3, the ceramic 5 is not subjected to heat or external force directly from the outer container part 2 or the inner container part 3, and therefore damage caused by heat or external force is suppressed. As described above, despite the use of ceramic 5, a cup 1A that is resistant to external force and heat can be provided.

[0027] Furthermore, the cup 1A has an internal space 4 between the outer container portion 2 and the inner container portion 3, which provides good heat insulation and excellent heat retention.

[0028] In this first embodiment, the inner container part 3 is translucent. Therefore, the ceramic ware 5 can be seen through the inner container part 3, and the design on the back side of the ceramic ware 5 can be seen.

[0029] In this first embodiment, the upper ends of the outer container part 2 and the inner container part 3 are formed at the same height, and the upper ends of both the outer container part 2 and the inner container part 3 are joined by a joint part 6. Therefore, the storage space for the ceramic ware 5 is large, and there is a high degree of freedom in the size of the ceramic ware 5. In other words, it is possible to set it so that ceramic ware 5 having dimensions slightly lower than the height of the outer container part 2 and the inner container part 3 can be stored.

[0030] In this first embodiment, the ceramic piece 5 is arranged to be movable both vertically and horizontally within the internal space 4. Therefore, when the user shakes the cup 1A vertically or horizontally, the user can hear the sound. Every time the user drinks from the drink in the cup 1A, the ceramic piece 5 moves up and down, and the user can hear the sound.

[0031] In this first embodiment, the outer container portion 2 and the inner container portion 3 are made of glass. Therefore, the entire outer surface of the cup 1A is made of glass, which is superior in terms of hygiene compared to other materials. Glass is inferior to plastics compared to other materials, but is generally superior in terms of productivity, etc.

[0032] In this first embodiment, the outer container portion 2 and the inner container portion 3 are specifically made of borosilicate glass. Borosilicate glass has a thermal expansion coefficient of 30× (10 to the power of 7), which is about one-third that of regular glass, reducing thermal stress caused by temperature differences and making the cup 1A resistant to thermal damage. Borosilicate glass has a heat-resistant temperature of 450°C, which is higher than that of regular glass, making the cup 1A resistant to thermal damage in this respect as well.

[0033] In this first embodiment, the ceramic 5 is made of a material containing 60% or more of silica and feldspar (Na, K, Ca, Ba) (Si, Al) 408. Therefore, the ceramic 5 has high heat resistance and will not crack when heated to high temperatures.

[0034] Second Embodiment Figures 4 to 6 show a second embodiment of the present invention. As shown in Figures 4 to 6, a cup 1B, which is a container of this second embodiment, differs from that of the first embodiment only in the following configuration.

[0035] That is, the upper end of the outer container part 2 is set lower than the upper end of the inner container part 3 when the outer container part 2 and the inner container part 3 are overlapped. More specifically, the side surface part 3a of the inner container part 3 is composed of a truncated cone 3c whose lower end continues from the bottom surface part 3b, an expanding truncated cone 3d that continues from the upper end of the truncated cone 3c and has a large inclination angle, and a cylindrical part 3e that connects to the upper end of the expanding truncated cone 3d. When the outer container part 2 and the inner container part 3 are overlapped, the outer container part 2 is set at the same height as the upper end of the expanding truncated cone 3d of the inner container part 3. The upper end of the outer container part 2 is joined to the inner container part 3 by a joint part 6. Specifically, the joint part 6 is formed by welding the upper end of the outer container part 2 to the corresponding upper end of the expanding truncated cone 3d of the inner container part 3. Therefore, the joint part 6 is formed in an arc shape by surface tension during the solidification process of the molten glass material (see FIG. 4(b)). In this second embodiment, the upper end of the inner container portion 3, that is, the upper end of the cylindrical portion 3e, forms the drinking spout.

[0036] The ceramic 5 has only a truncated cone-shaped side surface 5a and does not have a bottom surface as in the first embodiment. Therefore, the ceramic 5 is disposed in the region of the internal space 4 of the side surface portions 2a, 3a of both the outer container portion 2 and the inner container portion 3.

[0037] In this second embodiment, the ceramics 5 are arranged so as to be able to move largely in the vertical direction and slightly in the horizontal (sideways) direction.

[0038] The other configurations are the same as those of the first embodiment, and therefore, to avoid duplication, the description will be omitted. In Figures 4 to 6, the same components as those of the first embodiment are denoted by the same reference numerals for clarity.

[0039] As described above, the second embodiment also has substantially the same effects as the first embodiment. That is, because the ceramic 5 is not fixed to either the outer container part 2 or the inner container part 3, it is not damaged due to the difference in the thermal expansion coefficient between the outer container part 2 and the inner container part 3. Furthermore, since the ceramic 5 is not subjected to direct heat or external force from the outer container part 2 or the inner container part 3, compared to when the ceramic 5 is in close contact with the outer container part 2 or the inner container part 3, damage due to heat or external force is suppressed. As described above, despite the use of the ceramic 5, it is possible to provide a cup 1B that is resistant to external force and heat.

[0040] In this second embodiment, the upper end of the outer container part 2 is set lower than the upper end of the inner container part 3, and the upper end of the outer container part 2 is joined to the inner container part 3 by a joining part 6. Therefore, the part above the outer container part 2 is a single-layer structure of the inner container part 3 (specifically, a structure consisting of only the cylindrical part 3e), which makes it possible to reduce weight and material costs compared to the case where the two-layer structure of the outer container part 2 and the inner container part 3 is formed up to the upper end (as in the first embodiment).

[0041] (Third Embodiment) Figures 7 to 9 show a third embodiment of the present invention. As shown in Figures 7 to 9, the cup 1C, which is a container according to this third embodiment, differs from the second embodiment only in the following configuration. Specifically, the side surface 3a of the inner container portion 3 is composed of a truncated cone 3c whose lower end continues from the bottom surface 3b, a stepped cylindrical portion 3f continuing from the upper end of the truncated cone 3c, and a cylindrical portion 3e connected to the upper end of the stepped cylindrical portion 3f. The lower end surface 3g of the stepped cylindrical portion 3f protrudes outward beyond the upper end of the truncated cone 3c. The gap d (shown in Figure 7(b)) between the outer surface of the stepped cylindrical portion 3f and the inner surface of the side surface 2a of the outer container portion 2 is set small enough to prevent the ceramic ware 5 from entering. This allows the ceramic ware 5 to move only slightly vertically compared to the second embodiment. The remaining configuration is identical to the second embodiment, and a description thereof will be omitted to avoid repetition. In the drawings of FIGS. 7 to 9, the same components as those in the second embodiment are denoted by the same reference numerals for clarity.

[0042] As explained above, the third embodiment also has substantially the same effects as the first embodiment. That is, since the ceramic 5 is not fixed to either the outer container part 2 or the inner container part 3, it is not damaged due to the difference in the thermal expansion coefficient between the outer container part 2 and the inner container part 3. Furthermore, since the ceramic 5 is not subjected to direct heat or external force from the outer container part 2 or the inner container part 3, compared to when the ceramic 5 is in close contact with the outer container part 2 or the inner container part 3, damage due to heat or external force is suppressed. As described above, even though the ceramic 5 is used, it is possible to provide a cup 1C that is resistant to external force and heat.

[0043] In this third embodiment, as in the second embodiment, the upper end of the outer container part 2 is set lower than the upper end of the inner container part 3, and the upper end of the outer container part 2 is joined to the inner container part 3 by a joining part 6. Therefore, the part above the outer container part 2 is a single-layer structure of the inner container part 3 (specifically, a structure consisting of only the cylindrical part 3e), which makes it possible to reduce weight and material costs compared to the case where the two-layer structure of the outer container part 2 and the inner container part 3 is formed up to the upper end (as in the first embodiment).

[0044] (Method of Manufacturing a Cup) Next, a manufacturing method will be described using the cup 1B of the second embodiment as an example. The cup 1B is manufactured using a processing device 10 shown in FIG. 10. The processing device 10 has a first holding unit 11 and a second holding unit 12 arranged opposite each other, and the first holding unit 11 and the second holding unit 12 are each movable toward and away from each other. The first holding unit 11 has gripping portions 11a protruding at three locations circumferentially around the center of rotation, and these three gripping portions 11a grip the outer container unit 2. The second holding unit 12 has a truncated cone-shaped insertion jig 12a, which is inserted into the internal space of the inner container unit 3 to hold the inner container unit 3. The three gripping portions 11a of the first holding unit 11 and the insertion jig 12a of the second holding unit 12 are rotatable at the same speed around the same rotation axis.

[0045] The processing device 10 is provided with a burner 15 as a heating means and a carbon panel 17 as a heat insulating member. The burner 15 emits a flame toward the cup 1B attached to the processing device 10. It is preferable that the burner 15 emits a flame over a narrow range so that it can be emitted with pinpoint accuracy to the joining (welding) point.

[0046] The carbon panel 17 is disposed near the burner 15. The carbon panel 17 has an arc-shaped recess 17a. The recess 17a is formed to a size that fits almost without a gap onto the outer periphery of the outer vessel part 2 near the joining (welding) point (see FIG. 13(b)). The carbon panel 17 has a leading inclined part 17b that is inclined toward the upper end of the inner vessel part 3 (see FIG. 13(a)).

[0047] Next, the manufacturing process of the cup 1B will be described. The manufacturing process of the cup 1B mainly consists of a parts manufacturing process, a parts assembly process, and a welding process. In the parts manufacturing process, the outer container portion 2, the inner container portion 3, and the ceramic 5 are each manufactured individually. The outer container portion 2 and the inner container portion 3 are manufactured, for example, by glass blowing. The outer container portion 2 is manufactured to have an air hole 2c (shown in Figure 6) in the bottom portion 2b. The ceramic 5 is manufactured, for example, by mixing clay with powder of a predetermined material such as feldspar, and then molding and firing the mixture.

[0048] 11 , in the part assembling process, the outer container part 2 is rotatably attached to the three gripping parts 11a of the first holding part 11, and the inner container part 3 is rotatably attached to the insertion jig 12a of the second holding part 12. Then, the ceramic pieces 5 are temporarily placed inside the outer container part 2 or outside the inner container part 3 in a stacked state, and the gap between the first holding part 11 and the second holding part 12 is narrowed so that the ceramic pieces 5 are sandwiched between the outer container part 2 and the inner container part 3, and the outer container part 2 and the inner container part 3 are assembled in a temporarily joined state (see FIGS. 10 and 11 ).

[0049] 12 and 13 , in the welding process, the outer container part 2 and the inner container part 3 are rotated integrally by rotating the three gripping parts 11a of the first holding part 11 and the insertion jig 12a of the second holding part 12, while the joint between the outer container part 2 and the inner container part 3 is heated with a burner 15 to weld them together. In this second embodiment, the joint (welding) part between the outer container part 2 and the inner container part 3 is the upper end of the outer container part 2 and the corresponding part of the inner container part 3, and this part is heated all around. As a result, the glass material at the upper end of the outer container part 2 and the corresponding part of the inner container part 3 melts and mixes. Then, as the temperature drops after heating, it solidifies and forms a joint 6.

[0050] During the solidification process due to the drop in temperature of the glass material, the surface tension of the glass material causes the surface of the joint 6 to form an arc-like shape that protrudes outward (see FIG. 4(b)). The joint 6 and the surrounding surfaces that are continuous with it form a smooth curve without any irregularities.

[0051] After forming the joint 6 in this way, the air hole (2c) of the outer container part 2 is filled by melting and solidifying the glass material, and the manufacturing process is completed.

[0052] Next, the heating of the joining portion by the burner 15 will be described in more detail. A carbon panel 17 is placed on the outer periphery of the outer container portion 2, between the flame of the burner 15 and the position of the ceramic 5. The carbon panel 17 prevents the flame of the burner 15 from scattering toward the ceramic 5, or what is known as flame entrapment. The carbon panel 17 has a tip inclined portion 17b, which changes the direction of the flame emitted from the burner 15 after it hits the joining portion so that it moves away from the ceramic 5. This also reduces damage to the ceramic 5 due to heating.

[0053] The heat shielding of the flame by the carbon panel 17 prevents the ceramic ware 5 from rising in temperature suddenly, and prevents the ceramic ware 5 from being damaged by heat (breakage, discoloration, deformation, etc.).

[0054] As a pre-heating step before heating with the burner 15, a pre-heating step is performed in which the ceramic ware 5 is gradually heated for 3 minutes to a temperature of about 590° C. By performing the pre-heating step, a sudden temperature change during the welding step can be prevented, and therefore heat damage during the welding step can be prevented.

[0055] The welding process and subsequent temperature management are as follows: The upper edge of the rotating outer container part 2 and the corresponding joint of the inner container part 3 are heated to 1000°C to 1200°C for 3 to 6 minutes, then rapidly cooled to 590°C, and then slowly cooled to room temperature over 90 to 120 minutes. This temperature management prevents a sudden temperature change after the welding process, thereby preventing thermal damage during the welding process.

[0056] As described above, the manufacturing method of cup 1B includes a parts manufacturing process for respectively manufacturing outer container part 2, inner container part 3, and ceramic 5, a parts assembling process for assembling outer container part 2 and inner container part 3 in a temporarily joined state, with ceramic 5 placed in the gap between outer container part 2 and inner container part 3, and a welding process for heating and welding the joint between outer container part 2 and inner container part 3 to form joint 6.

[0057] More specifically, the manufacturing method of cup 1B includes a parts fabrication process for fabricating outer container portion 2, inner container portion 3, and ceramic piece 5, respectively; a parts assembly process for rotatably attaching outer container portion 2 to first holding portion 11, rotatably attaching inner container portion 3 to second holding portion 12 arranged opposite first holding portion 11, temporarily placing ceramic piece 5 on top of each other inside outer container portion 2 or outside inner container portion 3, narrowing the gap between first holding portion 11 and second holding portion 12, and assembling outer container portion 2 and inner container portion 3 in a temporarily joined state with ceramic piece 5 positioned between outer container portion 2 and inner container portion 3; and a welding process for heating and welding the joint between outer container portion 2 and inner container portion 3 while rotating outer container portion 11 and inner container portion 12 together by rotating first holding portion 11 and second holding portion 12, thereby forming joint portion 6.

[0058] The cup 1B manufactured in this manner has the following advantages: The ceramic 5 is not subject to thermal damage resulting from the difference in thermal expansion coefficient between the outer container part 2 and the inner container part 3. Furthermore, since the ceramic 5 is not subjected to heat or external force directly from the outer container part 2 or the inner container part 3, damage due to heat or external force is suppressed. As a result, despite using ceramic 5, a cup 1B that is resistant to external force and heat can be manufactured. Furthermore, because the cup 1B has an internal space 4 between the outer container part 2 and the inner container part 3, it has good insulation properties and therefore excellent heat retention.

[0059] In the component manufacturing process, the outer container portion 2 and the inner container portion 3 are manufactured, for example, by glass free-blowing. This glass free-blowing method can accurately manufacture the outer diameter dimensions of the outer container portion 2 and the inner container portion 3, but it is difficult to accurately manufacture the wall thickness. In other words, it is not possible to accurately manufacture the inner diameter dimension of the outer container portion 2. However, in the cup 1B of the second embodiment (the same applies to the cup 1A of the first embodiment), a movable ceramic piece 5 is placed in the internal space 4, so it is possible to design the internal space 4 to have a large dimensional tolerance in advance. This design facilitates manufacturing. Rather, it is possible to provide products in which the sound generated by the ceramic piece 5 moving varies from product to product.

[0060] The manufacturing method for each of the cups 1A and 1C of the first and third embodiments is substantially the same as the manufacturing method for the second embodiment described above, so we will avoid redundant explanation and only explain the differences. That is, in the cup 1A of the first embodiment, the joining (welding) points are the upper end portions of both the outer container portion 2 and the inner container portion 3, and these upper end portions are heated along the entire circumference. The glass material at the upper end portions of the outer container portion 2 and the inner container portion 3 then melts and mixes. Then, as the temperature drops after heating, it solidifies and forms the joint 6.

[0061] When the glass material solidifies, the surface tension of the glass material causes the surface shape of the joint 6 to be formed into an outwardly protruding arc (see FIG. 1(b)). The joint 6 and the surrounding surfaces are connected by a smooth curve without any irregularities. In the cup 1A of the first embodiment, the joint 6 forms the drinking spout, so the drinking spout is shaped to fit comfortably against the lips. Therefore, no additional processing is required to form the drinking spout. The cup 1C of the third embodiment is manufactured in the same way as the cup 1B of the second embodiment.

[0062] 10 to 13, the processing device 10 may be provided with air blowing means 16. The air blowing means 16 is disposed closer to the first holding part 11 than the joint (welding) between the outer container part 2 and the inner container part 3. In other words, the air blowing means 16 blows air toward the outer peripheral surface of the outer container part 2 in which the ceramic ware 5 is housed. The air blowing means 16 is disposed in two or more locations.

[0063] When the burner 17 heats the joining point (area G in FIG. 14 ), the blower 16 blows air (cooling air) around the outer periphery of the outer container part 2 on the ceramic 5 side. This airflow suppresses the temperature rise of the ceramic 5 inside the outer container part 2. The airflow from the blower 16 is also blocked by the carbon panel 17, so it is not blown to the joining point that is hit by the flame of the burner 15. As a result, the temperature of the joining point that is hit by the flame of the burner 15 does not drop due to the airflow, and the burner 15 reliably heats the joining point to the predetermined temperature.

[0064] In other words, the heat insulation of the flame by the carbon panel 17 and the air blowing by the air blowing means 16 prevent the ceramic ware 5 from rising in temperature suddenly, and the ceramic ware 5 can be more reliably prevented from suffering thermal damage (breakage, discoloration, deformation, etc.).

[0065] (Variations of the First to Third Embodiments) In the first to third embodiments, one piece of ceramic 5 is placed in the internal space 4, but multiple pieces may be placed. The ceramic 5 can be made of porcelain or earthenware, and both are applicable to the present invention. In the first to third embodiments, the internal space 4 is a single space, but multiple spaces may be used. In the first to third embodiments, both the outer container part 2 and the inner container part 3 are translucent, but the inner container part 3 may be configured to be opaque to light. In the first to third embodiments, the joint 6 between the outer container part 2 and the inner container part 3 is formed by welding, but it may be formed by adhesive or mechanical joining. However, welding is preferable due to the risk of aging, corrosion, peeling, breakage, etc. In the first to third embodiments, the outer container part 2 and the inner container part 3 are made of glass, but they may be made of materials other than glass. In the first to third embodiments, the outer container portion 2 and the inner container portion 3 are made of borosilicate glass, but they may be made of glass other than borosilicate glass. For example, they may be made of quartz glass. Quartz glass has the same thermal expansion coefficient and heat resistance temperature as borosilicate glass, making it a container that is similarly resistant to heat damage. In the first to third embodiments, the ceramic 5 may be made of a material containing sintered alumina. The inclusion of sintered alumina increases the melting point of the ceramic 5, resulting in cups 1A to 1C with excellent heat resistance. The ceramic 5 also includes ordinary pottery, which is more brittle than porcelain or clay containing alumina. In the first to third embodiments, the containers are cups 1A to 1C, but the present invention can be applied to containers other than cups.

[0066] Although each embodiment has been described in detail above, it is not limited to a specific embodiment, and various modifications and changes are possible within the scope of the claims. It is also possible to combine all or a plurality of components of the above-described embodiments.

[0067] The present invention can include at least the following embodiments. The embodiments can be adopted separately or in combination with each other. (1) The inner container part is a translucent container. (2) The upper ends of the outer container part and the inner container part are formed at the same height, and the upper ends of the outer container part and the inner container part are joined by a joint. (3) The upper end of the outer container part is formed lower than the upper end of the inner container part, and the upper end of the outer container part is joined to the outer container part by a joint. (4) The outer container part and the inner container part are made of glass. (5) The outer container part and the inner container part are made of borosilicate glass or quartz glass. (6) The ceramic is a porcelain or earthenware container. (7) The ceramic is a container made of a material containing 60% or more of silica and feldspar (Na, K, Ca, Ba) (Si, Al) 408. (8) A method for manufacturing a container in which the part assembling step is performed by mounting the parts on a processing device, and the welding step is performed by heating with a burner as heating means. (9) A method for manufacturing a container in which a heat-shielding member is used to prevent the burner flame from scattering onto the ceramic-side outer container part. (10) A method for manufacturing a container in which air is blown onto the ceramic-side outer container part by an air blowing means. (11) A method for manufacturing a container in which, as a pre-heating step using the burner, a pre-heating step is performed in which the ceramic is gradually heated for 3 minutes to provide a preheat of approximately 590°C. (12) A method for manufacturing a container in which, in the welding step, the joint between the inner container part and the outer container part is heated to 1000°C to 1200°C for 3 to 6 minutes, then rapidly cooled to 590°C, and then cooled to room temperature over 90 to 120 minutes.

[0068] 1A, 1B, 1C Cup (container) 2 Outer container part 3 Inner container part 4 Internal space 5 Ceramics 6 Joint part 10 Processing device 15 Burner (heating means) 17 Carbon panel (heat insulating member)

Claims

1. A container comprising: a light-transmitting outer container part; an inner container part disposed inside the outer container part and joined to the outer container part; and ceramics movably disposed in an internal space formed between the outer container part and the inner container part.

2. The container according to claim 1, wherein the inner container portion is translucent.

3. The container according to claim 1, wherein the upper ends of the outer container portion and the inner container portion are formed at the same height, and the upper ends of the outer container portion and the inner container portion are joined by a joint.

4. The container according to claim 1, wherein the upper end of the outer container part is formed lower than the upper end of the inner container part, and the upper end of the outer container part is joined to the outer container part by a joint.

5. The container according to claim 2, wherein the outer container portion and the inner container portion are made of glass.

6. The container according to claim 2, characterized in that the outer container part and the inner container part are made of borosilicate glass or quartz glass.

7. The container according to claim 1, characterized in that the ceramic is porcelain or earthenware.

8. The container according to claim 1, characterized in that the ceramic is made of a material containing silica, feldspar (Na, K, Ca, Ba) (Si, Al) 408 content of 60% or more.

9. A method for manufacturing a container comprising a parts production process for producing an outer container part, an inner container part, and ceramics, respectively, a parts assembly process for assembling the outer container part and the inner container part in a temporarily joined state, with the ceramics placed in the gap between the outer container part and the inner container part, and a welding process for heating and welding the joint between the outer container part and the inner container part to form a joint.

10. The method for manufacturing a container as described in claim 9, wherein the part assembly process uses a processing device capable of mounting the outer container part, the inner container part and the ceramics, and the welding process uses a burner as a heating means.

11. The method for manufacturing a container according to claim 10, characterized in that a heat insulating member is used to prevent the flame of the burner from scattering onto the outer container part on the ceramic side.

12. The method for manufacturing a container according to claim 10, characterized in that air is blown to the outer container part on the ceramic side by a blowing means.

13. The method for manufacturing a container according to claim 10, characterized in that, as a pre-heating step using the burner, the ceramic is gradually heated for 3 minutes to give a preheat of about 590°C.

14. A method for manufacturing a container as described in claim 9, characterized in that in the welding process, the joint between the inner container part and the outer container part is heated to 1000°C to 1200°C for 3 to 6 minutes, then rapidly cooled to 590°C, and then cooled to room temperature over a period of 90 to 120 minutes.