Insulated double container and manufacturing method thereof

Abstract

To easily position an outer container and an inner container at accurate positions, simplify manufacturing facilities, and reduce the manufacturing cost.SOLUTION: An insulated double container 1 includes a heat-insulating layer 4 between a bottomed metal inner container 2 with a substantially cylindrical shape and a bottomed metal outer container 3 with a substantially cylindrical shape, where the outer container 3 includes, on a mouth part 33, a fold part 331 folded inward, and an outer-container tapered part 332 extending such that a diameter thereof gradually decreases from a lower end of the fold part 331 toward a bottom side. and where the inner container 2 includes, at a tip of a mouth part 23, an inner-container tapered part 231 extending such that a diameter thereof gradually increases toward the mouth side of the inner container 2. The tip 2312 of the inner-container tapered part 231 is brought into contact with an inside inclined surface 3321 of the outer-container tapered part 332 and circumferentially welded to the outer-container tapered part 332.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a heat-insulating double-walled container, such as a double-walled mug, soup cup, lunch jar, portable thermos, tabletop thermos, etc., and a method for manufacturing the same. [Background technology]

[0002] A conventional insulated double container is disclosed in Patent Document 1, in which the inner container is inserted into the outer container from the mouth side of the outer container to position the inner container and the outer container. This insulated double container is an insulated double container in which the folded portion, which is folded back inwardly at the mouth of the outer container, is fitted inside the enlarged diameter portion formed at the mouth of the inner container until the tip of the folded portion approximately abuts the base of the enlarged diameter portion formed at the mouth of the inner container, and the tip of the folded portion is welded and fixed to the inner surface of the inner container.The inner container and the outer container are positioned by a first step of inserting the inner container into the outer container component from the mouth side and pressing the inner container into the outer container component while forcing the folded portion formed on the outer container component outward with the enlarged diameter portion formed at the mouth of the inner container; a second step of inserting the inner container into the outer container component until the enlarged diameter portion overcomes the folded portion, causing the folded portion to spring back inward and the peripheral wall of the enlarged diameter portion to spring back outward; and a third step of fitting the folded portion into the inside of the enlarged diameter portion until the tip of the folded portion approximately abuts the base of the enlarged diameter portion by a return motion that retracts the inner container toward the mouth side of the outer container component. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6978296 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the manufacturing process for the insulated double container described in Patent Document 1, the method of inserting the inner container into the outer container component from the mouth side and positioning the inner container by a return motion that moves the inner container back toward the mouth side of the outer container component has the problem that the manufacturing equipment, such as the jigs that hold the inner container, become complicated, resulting in high manufacturing costs.

[0005] The present invention has been proposed in consideration of the above-mentioned problems, and aims to provide an insulated double container and a manufacturing method thereof that can easily position the outer container and inner container in accurate positions, while also simplifying the manufacturing equipment and reducing manufacturing costs. [Means for solving the problem]

[0006] The insulated double container of the present invention is characterized in that an insulating layer is provided between an inner container which is approximately cylindrical with a bottom and made of metal and an outer container which is approximately cylindrical with a bottom and made of metal, the mouth of the outer container is formed with a folded portion folded inward and an outer container tapered portion extending from the lower end of the folded portion toward the bottom side so as to gradually reduce in diameter, the tip of the mouth of the inner container is formed with an inner container tapered portion extending toward the mouth side of the inner container so as to gradually increase in diameter, and the tip of the inner container tapered portion is abutted against the inner inclined surface of the outer container tapered portion and circumferentially welded to the outer container tapered portion. According to this, the inner container is inserted into the outer container or the outer container component from the mouth side of the outer container, and the tip of the inner container tapered part is abutted against the inner inclined surface of the outer container tapered part, so that the outer container and the inner container can be easily positioned at accurate positions. In addition, since the return operation of moving the inner container back, which requires complicated manufacturing equipment, is not necessary, the manufacturing equipment for the insulated double container can be simplified, and the manufacturing cost can be reduced. In addition, since the tip of the inner container tapered part is abutted against and welded to the inner inclined surface of the outer container tapered part located inside the container from the folded part, the welded part can be prevented from hitting the mouth of the user when the user drinks a beverage directly from the container. In addition, the welding between the tip of the inner container tapered part that is abutted against the inner inclined surface of the outer container tapered part can be performed at a wide welding angle, and the welded part can be finished beautifully by adjusting the welding angle as necessary.

[0007] The thermally insulated double container of the present invention is characterized in that the inclination angle of the inner inclined surface of the outer container tapered portion from the container axial direction is set to 10° to 80°. This ensures the formation of an insulating layer of an appropriate thickness, while eliminating the risk of the entire inner container falling into the interior of the outer container or outer container component when inserting the inner container into the outer container or outer container component from the mouth side of the outer container or outer container component, and makes it possible to more reliably position the outer container and inner container.

[0008] The insulated double container of the present invention is characterized in that the inclination angle of the outer inclined surface of the inner container tapered portion from the container axial direction is set to be larger than the inclination angle of the inner inclined surface of the outer container tapered portion from the container axial direction by within a range of 5°, and the outer inclined surface of the inner container tapered portion and the inner inclined surface of the outer container tapered portion are arranged so as to approximately mirror each other. According to this, by setting the inclination angle of the outer inclined surface of the tapered portion of the inner container larger than the inclination angle of the inner inclined surface of the tapered portion of the outer container, the tip of the tapered portion of the inner container can be brought into close contact with the inner inclined surface of the tapered portion of the outer container without any gap, thereby achieving more reliable welding between the tip of the tapered portion of the inner container and the tapered portion of the outer container. Also, by arranging the outer inclined surface of the tapered portion of the inner container and the inner inclined surface of the tapered portion of the outer container so as to approximately follow each other, it becomes possible to arrange the tapered portion of the inner container and the tapered portion of the outer container so as to be approximately stacked, and this approximately stacked arrangement makes it possible to position the outer container and the inner container in accurate positions more easily and more reliably.

[0009] The manufacturing method of the insulated double container of the present invention is a method of manufacturing the insulated double container of the present invention, and is characterized by comprising a first step of inserting the inner container into the outer container or into an outer container component that constitutes the mouth of the outer container from the mouth side, and positioning the inner container by abutting and engaging the tip of the inner container tapered portion with the inner inclined surface of the outer container tapered portion, and a second step of circumferentially welding the tip of the inner container tapered portion to the outer container tapered portion. This makes it possible to manufacture a heat-insulating double container by very simply positioning the outer container or the outer container component and the inner container at accurate positions.

[0010] The insulated double container of the present invention is characterized in that an insulating layer is provided between an inner container which is approximately cylindrical with a bottom and made of metal and an outer container which is approximately cylindrical with a bottom and made of metal, the mouth of the inner container is formed with a folded portion folded back outward and an inner container tapered portion extending from the lower end of the folded portion toward the bottom side so as to gradually increase in diameter, the tip of the mouth of the outer container is formed with an outer container tapered portion extending toward the mouth side of the outer container so as to gradually decrease in diameter, and the tip of the inner container tapered portion is abutted against the outer inclined surface of the outer container tapered portion and circumferentially welded to the outer container tapered portion. According to this, the inner container is inserted into the outer container or the outer container component from the mouth side of the outer container, and the tip of the inner container tapered part is brought into contact with the outer inclined surface of the outer container tapered part, so that the outer container and the inner container can be easily positioned at accurate positions. In addition, since the return operation of moving the inner container back, which requires complex manufacturing equipment, is not necessary, the manufacturing equipment for the insulated double container can be simplified, and manufacturing costs can be reduced. In addition, since the tip of the inner container tapered part is welded in contact with the outer inclined surface of the outer container tapered part located on the outer side of the container than the folded part, it is possible to prevent the welded part from touching the mouth of the user when the user drinks a beverage directly from the container. In addition, the welding between the tip of the inner container tapered part that is brought into contact with the outer inclined surface of the outer container tapered part can be performed at a wide welding angle, and the welded part can be finished beautifully by adjusting the welding angle as necessary.

[0011] The insulated double container of the present invention is characterized in that the inclination angle of the inner inclined surface of the inner container tapered portion from the container axial direction is set to be smaller than the inclination angle of the outer inclined surface of the outer container tapered portion from the container axial direction by within a range of 5°, and the inner inclined surface of the inner container tapered portion and the outer inclined surface of the outer container tapered portion are arranged so as to approximately mirror each other. According to this, by setting the inclination angle of the inner inclined surface of the tapered portion of the inner container smaller than the inclination angle of the outer inclined surface of the tapered portion of the outer container, the tip of the tapered portion of the inner container can be brought into close contact with the outer inclined surface of the tapered portion of the outer container without any gap, thereby achieving more reliable welding between the tip of the tapered portion of the inner container and the tapered portion of the outer container. Also, by arranging the inner inclined surface of the tapered portion of the inner container and the outer inclined surface of the tapered portion of the outer container so as to approximately follow each other, it becomes possible to arrange the tapered portion of the inner container and the tapered portion of the outer container so as to be approximately stacked, and this approximately stacked arrangement makes it possible to position the outer container and the inner container in accurate positions more easily and more reliably.

[0012] The manufacturing method of the insulated double container of the present invention is a method of manufacturing the insulated double container of the present invention, and is characterized by comprising a first step of inserting the inner container into the outer container or into an outer container component that constitutes the mouth of the outer container from the mouth side, placing the inner container tapered portion outside the outer container tapered portion, and positioning the tip of the inner container tapered portion by abutting and engaging it with the outer inclined surface of the outer container tapered portion, and a second step of circumferentially welding the tip of the inner container tapered portion to the outer container tapered portion. This makes it possible to manufacture a heat-insulating double container by very simply positioning the outer container or the outer container component and the inner container at accurate positions. Effect of the Invention

[0013] According to the present invention, the outer container and the inner container of the heat-insulating double container can be easily positioned at accurate positions, and the manufacturing equipment can be simplified and the manufacturing costs can be reduced. [Brief description of the drawings]

[0014] [Figure 1] 1 is a plan view showing an insulated double container according to a first embodiment of the present invention. [Diagram 2] Cross section AA of Figure 1. [Diagram 3] FIG. 3 is an enlarged cross-sectional view of part B in FIG. 2 . [Figure 4]FIG. 4 is a process explanatory diagram illustrating a process of inserting an inner container into an outer container in a manufacturing process of the insulated double container of the first embodiment. [Diagram 5] 4 is an enlarged cross-sectional view of a portion of a thermally insulated double container according to a second embodiment of the present invention, which corresponds to FIG. 3. [Figure 6] FIG. 11 is a process explanatory diagram illustrating a process of inserting an inner container into an outer container in a manufacturing process of the insulated double container of the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] [Thermal insulating double container of the first embodiment and its manufacturing method] As shown in Figs. 1 to 4, the heat-insulating double container 1 of the first embodiment according to the present invention has an inner container 2 of a substantially cylindrical bottom and made of a metal such as stainless steel, and an outer container 3 of a substantially cylindrical bottom and made of a metal such as stainless steel, with a space provided between the inner container 2 and the outer container 3, which serves as a heat-insulating layer 4. The heat-insulating layer 4 in this embodiment is an air layer heat-insulating layer in which the space between the inner container 2 and the outer container 3 is kept at atmospheric pressure, but it may also be a vacuum heat-insulating layer in which the space between the inner container 2 and the outer container 3 is kept at a vacuum or reduced pressure, or a heat-insulating layer in which a vacuum heat-insulating material is provided in the space between the inner container 2 and the outer container 3. The heat-insulating double container 1 in the illustrated example is a mug with a rotating handle.

[0016] The inner container 2 is composed of a peripheral side wall 21, a bottom 22, and a mouth 23 formed integrally with the peripheral side wall 21 on the upper side of the peripheral side wall 21, and is open on the side of the mouth 23. An inner container tapered portion 231 is formed at the tip of the mouth 23 of the inner container 2 so as to gradually expand in diameter toward the mouth side of the inner container 2, and the inner container tapered portion 231 is provided circumferentially. A bent portion 232 bent in a substantially L-shape and constituting the mouth 23 is formed circumferentially between the upper end of the peripheral side wall 21 of the inner container 2 extending in the vertical direction and the base of the inner container tapered portion 231. The inner container tapered portion 231 and the bent portion 232 constituting the mouth 23 are preferably formed, for example, by performing a spinning process on the opening side of a bottomed cylindrical inner container constituent member.

[0017] The outer container 3 is composed of a peripheral side wall 31, a bottom 32, and a mouth portion 33 that is formed integrally with the peripheral side wall 31 on the upper side of the peripheral side wall 31, and is open on the side of the mouth portion 33. The mouth portion 33 of the outer container 3 is formed with a folded portion 331 folded back inward in a substantially arc shape, and an outer container tapered portion 332 that extends from the lower end of the folded portion 331 toward the bottom side so as to gradually reduce in diameter, and the folded portion 331 and the outer container tapered portion 332 are each formed in a circumferential shape. The folded portion 331 and the outer container tapered portion 332 that constitute the mouth portion 33 are preferably formed, for example, by performing a spinning process on the opening side of a bottomed cylindrical outer container component.

[0018] In the present embodiment, the inner inclined surface 3321 of the outer container tapered portion 332 is formed with an inclination angle α1 from the container axial direction set to 10° to 80°. From the viewpoint of securing the capacity of the liquid or the like contained in the heat-insulating double container 1, it is more preferable to set the inclination angle α1 of the inner inclined surface 3321 of the outer container tapered portion 332 from the container axial direction to 10° to 60°. In addition, the inclination angle β1 of the outer inclined surface 2311 of the inner container tapered portion 231 from the container axial direction is set to be larger than the inclination angle α1 of the inner inclined surface 3321 of the outer container tapered portion 332 from the container axial direction within a range of 5°, and more preferably, is set to be larger than the inclination angle α1 of the inner inclined surface 3321 of the outer container tapered portion 332 from the container axial direction within a range of 3°. The outer inclined surface 2311 of the inner container tapered portion 231 and the inner inclined surface 3321 of the outer container tapered portion 332 are arranged so as to approximately follow each other, and are arranged in an approximately stacked state.

[0019] The tip 2312 of the inner container tapered portion 231 abuts against the inner inclined surface 3321 of the outer container tapered portion 332, and is circumferentially welded to the outer container tapered portion 332 at a welded portion 5 provided at the abutting location by laser welding or the like. In this embodiment, the inclination angle β1 of the outer inclined surface 2311 extending substantially linearly in a cross-sectional view of the inner container tapered portion 231 is set to be larger than the inclination angle α1 of the inner inclined surface 3321 extending substantially linearly in a cross-sectional view of the outer container tapered portion 332. As a result, the tip 2312 of the inner container tapered portion 231 abuts against the inner inclined surface 3321 of the outer container tapered portion 332 in close contact with no gap, and this close contact ensures reliable welding by the welded portion 5 between the tip 2312 of the inner container tapered portion 231 and the outer container tapered portion 332.

[0020] When manufacturing the thermally insulated double container 1 of the first embodiment, as shown in Fig. 4, the inner container 2 is inserted from the mouth side into the outer container 3 or into an outer container component constituting the mouth 33 of the outer container 3, such as a component consisting of the mouth 33 and peripheral side wall 31 of the outer container 3 (see the thick arrow in Fig. 4(a)), and the inner container 2 is positioned by abutting and engaging the tip 2312 of the inner container tapered portion 231 with the inner inclined surface 3321 of the outer container tapered portion 332. Then, the tip 2312 of the positioned inner container tapered portion 231 is circumferentially welded to the outer container tapered portion 332, thereby manufacturing the thermally insulated double container 1.

[0021] According to the heat-insulating double container 1 of the first embodiment, the inner container 2 is inserted into the outer container 3 or an outer container component from the mouth side of the outer container 3, and the tip 2312 of the inner container tapered portion 231 abuts against the inner inclined surface 3321 of the outer container tapered portion 332, so that the outer container 3 and the inner container 2 can be easily positioned at accurate positions. In addition, since a return operation for retracting the inner container 2, which requires complex manufacturing equipment, is not required, the manufacturing equipment for the heat-insulating double container 1 can be simplified, and manufacturing costs can be reduced. In addition, the tip 2312 of the inner container tapered portion 231 is abutted against and welded to the inner inclined surface 3321 of the outer container tapered portion 332, which is located inside the container more than the folded portion 331, so that the welded portion 5 can be prevented from hitting the mouth of a user when the user drinks a beverage directly from the container. In addition, welding between the abutting tip 2312 of the inner container tapered portion 231 and the inner inclined surface 3321 of the outer container tapered portion 332 can be performed at a wide welding angle, and a beautiful finish to the welded part 5 can be achieved by adjusting the welding angle as necessary.

[0022] Furthermore, by setting the inclination angle α1 of the inner inclined surface 3321 of the outer container tapered portion 332 from the container axial direction to 10° to 80°, it is possible to ensure the formation of an insulating layer of an appropriate thickness while eliminating the risk that the entire inner container 2 will fall into the outer container 3 or the outer container component when inserting the inner container 2 into the outer container 3 or the outer container component from the mouth side of the outer container 3 or the outer container component, and it is possible to more reliably position the outer container 3 and the inner container 2.

[0023] Moreover, by setting the inclination angle β1 of the outer inclined surface 2311 of the inner container tapered portion 231 larger than the inclination angle α1 of the inner inclined surface 3321 of the outer container tapered portion 332, the tip 2312 of the inner container tapered portion 231 can be brought into close contact with the inner inclined surface 3321 of the outer container tapered portion 332 without any gap, thereby achieving a more reliable welding between the tip 2312 of the inner container tapered portion 231 and the outer container tapered portion 332. Moreover, by arranging the outer inclined surface 2311 of the inner container tapered portion 231 to approximately follow the inner inclined surface 3321 of the outer container tapered portion 332, it becomes possible to arrange the inner container tapered portion 231 and the outer container tapered portion 332 so as to be approximately stacked, and this approximately stacked arrangement makes it possible to position the outer container 3 and the inner container 2 in accurate positions more easily and more reliably.

[0024] [Second embodiment of the insulated double container and its manufacturing method] The second embodiment of the insulated double container 1a according to the present invention has a structure of the mouth 23a of the inner container 2a and the mouth 33a of the outer container 3a which differs from the structures of the mouth 23 of the inner container 2 and the mouth 33 of the outer container 3 of the insulated double container 1, the inner container 2 and the mouth 33 of the outer container 3 of the first embodiment, but otherwise has the same configuration as the insulated double container 1 of the first embodiment.

[0025] As shown in Fig. 5, the mouth 23a of the inner container 2a in the thermally insulated double container 1a of the second embodiment is provided on the upper side of the peripheral side wall 21 and is formed integrally with the peripheral side wall 21. The mouth 23a is formed with a folded portion 231a folded back outward in a generally arc shape and an inner-container tapered portion 232a extending from the lower end of the folded portion 231a toward the bottom side so as to gradually increase in diameter, and the folded portion 231a and the inner-container tapered portion 232a are each formed in a circumferential shape. The folded portion 231a and the inner-container tapered portion 232a constituting the mouth 23a are preferably formed, for example, by performing a spinning process on the opening side of a bottomed cylindrical inner-container component.

[0026] The mouth 33a of the outer container 3a is provided on the upper side of the peripheral side wall 31 and is formed integrally with the peripheral side wall 31. An outer container tapered portion 331a is formed at the tip of the mouth 33a of the outer container 3a so as to gradually reduce in diameter toward the mouth side of the outer container 3a, and the outer container tapered portion 331a is provided circumferentially. The outer container tapered portion 331a constituting the mouth 33a is preferably formed, for example, by performing a spinning process on the opening side of a bottomed cylindrical outer container component.

[0027] In this embodiment, the outer inclined surface 331a1 of the outer container tapered portion 331a is formed with an inclination angle α2 from the container axial direction set to 10° to 80°. In addition, the inclination angle β2 of the inner inclined surface 232a1 of the inner container tapered portion 232a from the container axial direction is set to be smaller than the inclination angle α2 of the outer inclined surface 331a1 of the outer container tapered portion 331a from the container axial direction by within a range of 5°, and more preferably set to be smaller than the inclination angle α2 of the outer inclined surface 331a1 of the outer container tapered portion 331a from the container axial direction by within a range of 3°. The inner inclined surface 232a1 of the inner container tapered portion 232a and the outer inclined surface 331a1 of the outer container tapered portion 331a are arranged so as to substantially follow each other and are arranged in a substantially stacked state.

[0028] The tip 232a2 of the inner container tapered portion 232a abuts against the outer inclined surface 331a1 of the outer container tapered portion 331a, and is circumferentially welded to the outer container tapered portion 331a at a welded portion 5a provided at the abutting location by laser welding or the like. In this embodiment, the inclination angle β2 of the inner inclined surface 232a1 extending substantially linearly in a cross-sectional view of the inner container tapered portion 232a is set to be larger than the inclination angle α2 of the outer inclined surface 331a1 extending substantially linearly in a cross-sectional view of the outer container tapered portion 331a, so that the tip 232a2 of the inner container tapered portion 232a abuts closely against the outer inclined surface 331a1 of the outer container tapered portion 331a without any gaps, and this tightness ensures reliable welding by the welded portion 5a between the tip 232a2 of the inner container tapered portion 232a and the outer container tapered portion 331a.

[0029] When manufacturing the heat-insulating double container 1a of the second embodiment, as shown in Fig. 6, the inner container 2a is inserted from the mouth side into the outer container 3a or into an outer container component constituting the mouth 33a of the outer container 3a, such as a component consisting of the mouth 33a of the outer container 3 and the peripheral side wall 31 (see the thick arrow in Fig. 6(a)), and the inner container tapered portion 232a of the inner container 2a is placed outside the outer container tapered portion 331a so as to cover the outer container tapered portion 331a, and the tip 232a2 of the inner container tapered portion 232a is abutted against the outer inclined surface 331a1 of the outer container tapered portion 331a to be locked and positioned. Then, the tip 232a2 of the positioned inner container tapered portion 232a is circumferentially welded to the outer container tapered portion 331a to manufacture the heat-insulating double container 1a.

[0030] According to the second embodiment of the heat-insulating double container 1a, the inner container 2a is inserted into the outer container 3a or the outer container component from the mouth side of the outer container 3a, and the tip 232a2 of the inner container tapered portion 232a abuts against the outer inclined surface 331a1 of the outer container tapered portion 331a, so that the outer container 3a and the inner container 2a can be easily positioned at accurate positions. In addition, since a return operation for retracting the inner container 2a, which requires complex manufacturing equipment, is not required, the manufacturing equipment for the heat-insulating double container 1a can be simplified, and manufacturing costs can be reduced. In addition, the tip 232a2 of the inner container tapered portion 232a abuts against the outer inclined surface 331a1 of the outer container tapered portion 331a, which is located on the outer side of the container than the folded portion 231a, and is welded, so that the welded portion 5a can be prevented from hitting the mouth of the user when the user drinks a beverage directly from the container. In addition, welding between the abutting tip 232a2 of the inner container tapered portion 232a and the outer inclined surface 331a1 of the outer container tapered portion 331a can be performed at a wide welding angle, and a beautiful finish to the welded portion 5a can be achieved by adjusting the welding angle as necessary.

[0031] Moreover, by setting the inclination angle β2 of the inner inclined surface 232a1 of the inner container tapered portion 232a smaller than the inclination angle α2 of the outer inclined surface 331a1 of the outer container tapered portion 331a, the tip 232a2 of the inner container tapered portion 232a can be brought into close contact with the outer inclined surface 331a1 of the outer container tapered portion 331a without any gap, thereby realizing a more reliable welding between the tip 232a2 of the inner container tapered portion 232a and the outer container tapered portion 331a. Moreover, by arranging the inner inclined surface 232a1 of the inner container tapered portion 232a to approximately follow the outer inclined surface 331a1 of the outer container tapered portion 331a, it becomes possible to arrange the inner container tapered portion 232a and the outer container tapered portion 331a so as to be approximately stacked, and this approximately stacked arrangement makes it possible to position the outer container 3a and the inner container 2a at accurate positions more easily and more reliably.

[0032] [Scope of the invention disclosed herein] The inventions disclosed in this specification include, in addition to the inventions, embodiments, and modifications thereof listed as inventions, those specified by changing partial contents of these to other contents disclosed in this specification, those specified by adding other contents disclosed in this specification to these contents, or those specified by deleting partial contents of these to the extent that partial effects are obtained, and forming a higher-level concept. The inventions disclosed in this specification also include the following modifications and additions.

[0033] The insulated double container of the present invention includes an insulated double container of any suitable configuration in which the tip of the inner container tapered portion of the inner container abuts against the inner inclined surface of the outer container tapered portion of the outer container and is circumferentially welded to the outer container tapered portion. For example, in the insulated double container 1 of the first embodiment, the inclination angle β1 of the outer inclined surface 2311 of the inner container tapered portion 231 from the container axial direction and the inclination angle α1 of the inner inclined surface 3321 of the outer container tapered portion 332 from the container axial direction can be set to the same angle, and the tip 2312 of the inner container tapered portion 231 can abut against the inner inclined surface 3321 of the outer container tapered portion 332.

[0034] Furthermore, the insulated double container of the present invention includes an insulated double container of any suitable configuration in which the tip of the inner container tapered portion of the inner container abuts against the outer inclined surface of the outer container tapered portion of the outer container and is circumferentially welded to the outer container tapered portion. For example, in the insulated double container 1a of the second embodiment, the inclination angle β2 of the inner inclined surface 232a1 of the inner container tapered portion 232a from the container axial direction and the inclination angle α2 of the outer inclined surface 331a1 of the outer container tapered portion 331a from the container axial direction can be set to the same angle, and the tip 232a2 of the inner container tapered portion 232a can abut against the outer inclined surface 331a1 of the outer container tapered portion 331a. [Industrial Applicability]

[0035] The present invention can be used for insulating double containers such as double-walled mugs, soup cups, lunch jars, portable thermoses, and tabletop thermoses. [Explanation of symbols]

[0036] 1, 1a...insulated double container 2, 2a...inner container 21...peripheral side wall 22...bottom 23, 23a...mouth 231...tapered portion of inner container 2311...outer inclined surface of tapered portion of inner container 2312...tip of tapered portion of inner container 232...bent portion 231a...folded portion 232a...tapered portion of inner container 232a1...inner inclined surface of tapered portion of inner container 232a2...tip of tapered portion of inner container 3, 3a...outer container 31...peripheral side wall 32...bottom 33, 33a...mouth 331...folded portion 332...tapered portion of outer container 3321...inner inclined surface of tapered portion of outer container 331a...tapered portion of outer container 331a1...outer inclined surface of tapered portion of outer container 4...insulating layer 5, 5a...welded portion α1: Angle of inclination of the inner inclined surface of the outer container tapered part from the container axial direction β1: Angle of inclination of the outer inclined surface of the inner container tapered part from the container axial direction α2: Angle of inclination of the outer inclined surface of the outer container tapered part from the container axial direction β2: Angle of inclination of the inner inclined surface of the inner container tapered part from the container axial direction

Claims

1. a heat insulating layer is provided between a substantially bottomed cylindrical inner container made of metal and a substantially bottomed cylindrical outer container made of metal; The opening of the inner container is formed with a folded portion folded outward and an inner-container tapered portion extending from the lower end of the folded portion toward the bottom so as to gradually increase in diameter, an outer container tapered portion is formed at the tip of the mouth of the outer container, the outer container tapered portion extending so as to gradually reduce in diameter as a whole toward the mouth side of the outer container; a tip of the tapered portion of the inner container abutting against an outer inclined surface of the tapered portion of the outer container and circumferentially welded to the tapered portion of the outer container; an inclination angle of an inner inclined surface extending substantially linearly in a cross-sectional view of the inner-container tapered portion from the container axial direction is set to be smaller than an inclination angle of an outer inclined surface extending substantially linearly in a cross-sectional view of the outer-container tapered portion from the container axial direction; An insulated double container, characterized in that the tip of the inner container tapered portion, which has a smaller inclination angle than the outer inclined surface of the outer container tapered portion, abuts and engages with the middle of the outer inclined surface of the outer container tapered portion.

2. the inclination angle of the inner inclined surface of the tapered portion of the inner container from the container axial direction is set to be smaller within a range of 5° than the inclination angle of the outer inclined surface of the tapered portion of the outer container from the container axial direction, 2. The insulated double container according to claim 1, wherein the inner inclined surface of the tapered portion of the inner container and the outer inclined surface of the tapered portion of the outer container are arranged so as to substantially follow each other.

3. An insulated double container as described in Claim 2, characterized in that the inclination angle of the outer inclined surface extending approximately linearly in a cross-sectional view of the outer container tapered portion from the overall container axial direction is set to 10° to 80°.

4. A method for manufacturing an insulated double container according to any one of claims 1 to 3, a first step of inserting the inner container into the outer container or into an outer container component constituting the mouth of the outer container from the mouth side, locating the tapered portion of the inner container outside the tapered portion of the outer container, and positioning the inner container by abutting and engaging the tip of the tapered portion of the inner container against the outer inclined surface of the tapered portion of the outer container; a second step of circumferentially welding the tip of the tapered portion of the inner container to the tapered portion of the outer container.

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