Dual container, refill container and method of manufacturing a refill container

Abstract

A double container (3) having an outer container (2) and an inner container (1), the inner container being replaceable relative to the outer container (2). The outer container (2) has a bottom wall (21), a side wall (22) and a cylindrical opening (24) located above the side wall (22). The inner container (1) has a bottom surface (11), a side surface (12) and an upper flange (15) that protrudes radially outward from the upper end of the side surface (12). The inner container (1) is made of a sheet of synthetic resin. In the state of the double container (3) with the inner container (1) in the outer container (2), the upper flange (15) of the inner container (1) is located above the upper end of the opening (24) of the outer container (2). At least the upper outer periphery of the side surface (12) of the inner container (1) is polygonal.

Description

Technical Field

[0001] This invention relates to a dual container, a replacement container contained in a dual container, and a method for manufacturing the replacement container. Background Technology

[0002] In recent years, from the perspective of the SDGs (Sustainable Development Goals) and in order to conserve resources, the use of double containers with replaceable inner containers has become increasingly popular in the cosmetics industry. The resin inner containers used in these double containers have traditionally been manufactured using injection molding. To further reduce resin consumption, inner containers manufactured using sheet molding have also been proposed (Patent Document 1).

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2023-97318 Summary of the Invention The problem that the invention aims to solve However, in patent document 1, such as Figure 1 The sheet-molded inner container shown, with no protrusions or recesses in the storage section, when joined with the outer container to form a double container, will cause the outer side of the inner container to fit tightly against the inner side of the outer container's cylindrical part if the double container state continues. This makes it difficult to remove the inner container when it is being replaced as a replacement.

[0004] Therefore, in view of the above circumstances, the present invention aims to provide a dual container that includes an inner container that can be easily removed from an outer container while minimizing the amount of resin used.

[0005] Methods for solving problems To address the aforementioned issues, in one embodiment of the present invention, A dual container is provided, which has: The outer container and the inner container, with the inner container being replaceable and storeable relative to the outer container. The outer container has a bottom wall, side walls, and a cylindrical opening located above the side walls. The inner container has a bottom surface, a side surface, and an upper flange that projects radially outward from the upper end of the side surface. The inner container is made of a sheet of synthetic resin. In the double-container configuration where the outer container contains the inner container, the upper flange of the inner container is positioned above the upper end of the opening of the outer container. The outer periphery of at least the upper part of the side portion of the inner container is polygonal.

[0006] The effects of the invention According to one aspect of the invention, in a double container, the inner container can be easily removed from the outer container while minimizing the amount of resin used. Attached Figure Description

[0007] 【 Figure 1 An exploded perspective view of a double container with a lid, as shown in the example.

[0008] 【 Figure 2 [A perspective view of the dual container according to the first embodiment of the present invention.]

[0009] 【 Figure 3A [A cross-sectional view of a double-lid container with a lid according to the first embodiment of the present invention.]

[0010] 【 Figure 3B [A cross-sectional view of a double-lid container with a lid according to the first embodiment of the present invention.]

[0011] 【 Figure 4 [Exploded perspective view of the double-lid container of the present invention.]

[0012] 【 Figure 5 A flowchart of the internal container manufacturing method of the present invention.

[0013] 【 Figure 6A [Image showing an illustration of the method for manufacturing the inner container of the present invention]

[0014] 【 Figure 6B [Image showing an illustration of the method for manufacturing the inner container of the present invention]

[0015] 【 Figure 6C [Image showing an illustration of the method for manufacturing the inner container of the present invention]

[0016] 【 Figure 7 [A bottom perspective view of the contents of a modified example of the first embodiment of the present invention.]

[0017] 【 Figure 8 [A perspective view of the contents of the second embodiment of the present invention.]

[0018] 【 Figure 9 [A perspective view of the contents of the third embodiment of the present invention.]

[0019] 【 Figure 10 [A perspective view of the contents of the fourth embodiment of the present invention.]

[0020] 【 Figure 11 [Image showing a perspective view of a modified example of the outer container of the present invention] Detailed Implementation

[0021] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following drawings, the same reference numerals are used to denote the same constituent parts, and repeated descriptions may be omitted.

[0022] This invention relates to double containers, particularly double containers for containing viscous or solid substances. The inner container of the double container is a resin container formed from sheet material, which may or may not be self-standing. The outer container of the double container is a self-standing container, preferably made of glass, but may also be made of wood, resin, silicon, metal, paper, etc.

[0023] The contents contained in the inner container held by the outer container of the double container of the present invention are preferably substances such as cosmetics, perfumes, detergents, and seasonings that are not used up at once, but are viscous or solid substances that can be used multiple times.

[0024] In this instruction manual, viscous substances refer to viscous cosmetics such as face creams, hair waxes, and ointments, viscous medicines, and viscous soaps. Solid substances refer to solid or semi-solid cosmetics such as hair sticks and hair waxes with particularly high hardness (e.g., substances with hardness similar to stick-shaped beauty serums), solid soaps, cheese, butter, and other food products.

[0025] In this invention, the viscous or solid substance can be pre-filled in the storage section and the inner container can be pre-set in the outer container, or it can be filled as a replacement (replacement container) along with the inner container.

[0026] <Overall Structure of the First Embodiment> First, using Figures 2-4 The overall structure of the dual container according to the first embodiment of the present invention will be described. Figure 2 This is a perspective view of the double container 3 according to the first embodiment. Figure 3A and Figure 3B This is a cross-sectional view of the double container 3 according to the first embodiment of the present invention. Figure 4 This is an exploded perspective view of the lidded double container 6 of the first embodiment.

[0027] The dual container 3 of the present invention comprises an inner container 1 and an outer container 2. Figure 2 The double container 3 shown is a wide-mouthed and low-profile can-shaped container. The double container 3 can be joined with the lid 4.

[0028] In this embodiment, the inner container 1 includes a bottomed cylindrical storage portion 10 having a bottom surface 11 and a side surface 12, and an upper flange 15 protruding outward from the upper end of the storage portion 10. (Refer to...) Figure 4The inner container 1 has a lower, tapered side 13 with a decreasing diameter, and an upper, polygonal side 14. The upper polygonal side 14 is formed by a regular dodecagon, but a regular quadrilateral to a regular 24-sided polygon is preferred. By providing a tapered side 13 with a decreasing diameter at the lower part of the inner container 1, it is easier to insert the inner container 2 when removing the used inner container from the outer container and placing the unused inner container (replacement) into the outer container 2.

[0029] The inner container 1 is formed by sheet molding a thin-walled resin sheet. The resin constituting the inner container 1 is composed of polyester resins such as polypropylene (PP), polyethylene (PE), acrylonitrile-butadiene-styrene (ABS), polybutylene terephthalate (PBT), polyoxymethylene (POM), polyethylene terephthalate (PET), polycarbonate (PC), acrylic resin (PMMA), and biodegradable resins.

[0030] Here, in Figure 3A and Figure 3B In the double container 3, Figure 3A yes Figure 2 Sectional view of plane AA' Figure 3B yes Figure 2 The BB' section view. That is, Figure 3A It is a cross-sectional view passing through the polygonal side 14 of the inner container 1. Figure 3B It is a cross-sectional view through the polygonal corner of the side 14 of the polygonal tube.

[0031] In the polygonal cylindrical side surface 14 on the upper part of the side surface 12 in this embodiment, in the cross-section of the polygon, the line connecting opposite sides is shorter than the diagonal connecting opposite corners.

[0032] Therefore, in the state of double container 3, as Figure 3A As shown, a gap is created at the edge (excluding the corners) of the polygonal cylindrical side 14 of the inner container 1 relative to the inner surface of the opening 24 of the outer container 2. For example, the gap is about 0.2 to 4 mm.

[0033] On the other hand, in the double container 3, Figure 3B The corner of the polygonal cylindrical side 14 of the inner container 1 is in contact with the inner surface of the opening 24 of the outer container 2, i.e., the gap is zero. As described above, since the inner container 1 is formed of a thin-walled sheet of resin, the portion of the polygonal cylindrical side 14 with a smaller diameter at the lower end than at the upper end on the inner surface of the opening 24 of the outer container 2 will also be deformed by the corner being squeezed, thereby maintaining the contact state between the polygonal cylindrical side 14 and the opening 24.

[0034] in addition, Figure 3B Although an example is shown where the corner of the polygonal cylindrical side 14 contacts the inner surface of the opening 24 of the outer container 2 in the state of the double container 3, considering the possibility of manufacturing deviations in the outer container 2, a gap of about 0 to 2 mm may exist relative to the inner surface of the opening 24 of the outer container 2. Even when a gap exists between the corner of the polygonal cylindrical side 14 and the inner surface of the opening 24, this gap distance is smaller than the gap between the edge of the polygonal cylindrical side 14 and the inner surface of the opening 24.

[0035] The outer container 2 is a container storage part that replaceably stores the inner container 1. The outer container 2 has a shell portion 20 including a bottom wall 21 and side walls 22. In the outer container 2, the upper end of the shell portion 20 is provided with a shoulder portion 23 extending outwards, and a cylindrical opening portion 24 extending upwards from the inner edge of the shoulder portion 23. Figure 3A , Figure 3B As shown, the diameter of the cylindrical opening 24 is smaller than that of the side wall 22 of the housing portion 20, and it is located further inside than the side wall 22.

[0036] Reference Figure 2 , Figure 4 The outer container 2 has a threaded protrusion 25 and an annular protrusion 26 on its outer peripheral surface of the opening 24. The threaded protrusion 25 of the outer container 2 is screwed into the threaded protrusion 43 of the lid 4. The annular protrusion 26 is located below the threaded protrusion 25, and the lid 4 is engaged by covering the annular protrusion 26. In addition, the annular protrusion 26 can also serve as a finger hook for the outer container 2 when the inner container 1 is pulled out of the outer container 2.

[0037] The outer container 2 of the present invention is preferably made of glass, but it can also be made of resin, glass, wood, silicon, metal, paper, etc. In the case of resin, it can be made of resins such as PP, PE, ABS, PBT, POM, PET, polyester resins, or biodegradable resins, similar to the inner container 1 described above. In the case of wood, it includes coniferous woods such as cedar, cypress, and pine, as well as broadleaf woods such as oak, walnut, black cherry, alder, and rubberwood, and also includes bamboo. In the case of paper, it can be, for example, self-supporting thick paper.

[0038] Reference Figure 4 The cover 4 has a top surface 41 and a peripheral wall 42, and the inner side of the peripheral wall 42 is provided with threaded protrusions 43. Figure 4 In the case of the lid, the upper surface of the top surface 41 is hemispherical and convex upwards, while the outer surface of the peripheral wall 42 widens towards the bottom. Furthermore, the shape of the lid is not limited to this; the upper surface of the top surface can be flat, and the outer surface of the peripheral wall can have a shape with a fixed diameter.

[0039] The lid 4 of the present invention is a cover that covers the upper flange 15 of the inner container 1 and the cylindrical opening 24 of the outer container 2, and is made of resins such as PP, PE, ABS, PBT, POM, PET or polyester resin, biodegradable resin, glass, wood, silicon, metal, paper, etc.

[0040] Furthermore, a gasket 5, serving as a sealing material to prevent leakage, may also be provided on the inner (lower) side of the top surface 41 of the cover 4. The gasket 5 may be bonded to the cover 4 or may be separate from the cover 4. The gasket 5 may be formed, for example, from elastic rubber or resin (e.g., PP, PE).

[0041] When the lid 4 is engaged with the double container 3, the threaded protrusion 25 of the opening 24 of the outer container 2 engages with the threaded protrusion 43 of the lid 4. At this time, the engagement is achieved with the gasket 5 sandwiched between the lower surface of the top surface 41 of the lid 4 and the upper flange 15 of the inner container 1.

[0042] If the elastic pad 5 is clamped to engage the lid 4 with the double container 3, the contents will not leak even if the double container 3 is tilted or inverted.

[0043] Here, as Figure 4 As shown in the exploded view, the inner container 1 is a replaceable (also called a refill) container that can be replaced (removable and replaceable) along with the viscous or solid substance that is the content. On the other hand, the outer container 2 and the lid 4 are reused after the replaceable container is replaced.

[0044] Therefore, the empty inner container 1 can be replaced with a new replacement container of the same shape, thus reusing the outer container 2.

[0045] The replaceable inner container 1, which can be used as a replacement, can have its upper surface covered by a film affixed to the upper flange 15 or a cover surrounding the upper flange 15. Thus, the replaceable inner container 1 can be circulated independently.

[0046] In addition, refer to Figure 3A , Figure 3B In the double container 3 where the inner container 1 and the outer container 2 are joined, the upper flange 15 of the inner container 1 is located above the upper end of the opening 24 of the outer container 2. Therefore, the width of the upper flange 15 of the inner container is the same as or wider than the thickness of the opening 24 of the outer container.

[0047] Therefore, in this embodiment, since the upper part of the side portion (cylindrical body portion) 12 of the inner container 1 is a polygonal cylindrical side portion 14, in the upper flange 15 with a rounded outer edge, the distance di between the corner of the polygon and the outer edge is relatively close, and the width is relatively narrow. In contrast, the distance dx between the center of the edge of the polygon and the outer edge is relatively far, and the width is relatively wide. Although it is set according to the thickness of the opening 24 of the outer container 2, the width di of the upper flange 15 is, for example, 0.5mm to 4mm, and dx is larger than di, which is 0.7mm to 5mm. With this shape, in the state of the double container 3, relative to the thickness of the opening 24 of the outer container 2, the corner portion contacts the inner edge or has a margin of about 0 to 2mm, and the edge portion has a margin of about 0.2mm to 4mm.

[0048] When connecting the inner container 1 to the outer container 2 as described above, the user presses the upper flange 15 of the inner container 1 from above and pushes it into the outer container 2. Conversely, when changing the replacement container, the user can pull the inner container 1 upward relative to the outer container 2 by hooking the outer edge of the upper flange 15 of the inner container 1 or a part of the inner side of the side portion 12 of the inner container 1 with their fingers.

[0049] <Container Manufacturing> Next, using Figure 5 , Figures 6A to 6C The manufacturing method of the inner container in the first embodiment will be described. Figure 5 This is a flowchart of the internal container manufacturing method. Figures 6A to 6C This is an explanatory diagram illustrating the manufacturing method of the inner container. In Figures 6A to 6C middle, Figure 6A This is an explanatory diagram of step S1. Figure 6B This is an explanatory diagram of step S2. Figure 6C This is an enlarged illustration of the cut portion in step S3. Additionally, in Figure 6A , Figure 6B The mold is shown schematically in the image.

[0050] First, in step S1, the thin-walled resin sheet S ( Figure 6A Before heating, the resin sheet is about 0.3 to 3.0 mm thick. After heating, the sheet becomes easier to stretch.

[0051] In step S2, the resin sheet S is brought close to the mold M, and pressure molding is performed by creating a vacuum from the bottom of the mold and applying air pressure from the top of the mold. Figure 6B ).

[0052] Here, the recess R formed in the mold M, like the receiving portion of the inner container 1, is a depression with a polygonal prism shape at the top and a downward-facing frustum shape at the bottom. Furthermore, while an example is shown in the mold M of a generally annular protrusion P with a polygonal inner edge and a circular outer edge around the recess R, the protrusion P may not be provided. Here, the amount of concavity of the recess R relative to its outer side in the mold M is greater than the amount of protrusion of the protrusion P relative to its outer side, approximately 5 to 20 times.

[0053] Furthermore, multiple fine holes H are formed on the mold M for vacuuming. Among the vacuuming holes H, the vacuuming hole H1 on the lower side of the mold M communicates with the recess R, while the vacuuming hole H2 on the outer side does not communicate with the recess R. Additionally, Figure 6A , Figure 6B Although the structure showing vacuum holes H1 and H2 connected within mold M is illustrated, in mold M, vacuum holes H1 and H2 can also extend independently to the lower end of mold M without being connected. Furthermore, in Figure 6A , Figure 6B In the diagram, vacuum port H2 appears as a straight line, but details are as follows: Figure 6C As shown, the vacuum hole H2 bends outward at the upper end.

[0054] By bringing the thin-walled resin sheet S close to the mold M and drawing it from the bottom of the mold M, the resin sheet S is stretched along the recess R of the mold M to form the receiving portion 10. At this time, a vacuum hole H2 is formed on the outside of the recess R of the mold M to form the upper flange 15. Since the receiving portion 10 along the recess R undergoes greater deformation than the upper flange 15 along the protrusion P, the wall thickness of the bottom surface 11 and the side surface 12 constituting the receiving portion 10 is thinner than that of the upper flange 15. For example, if the thickness of the thin-walled sheet S before forming is set to 1, the wall thickness of the receiving portion 10 is about 0.05 to 0.9, and the wall thickness of the upper flange is about 0.5 to 0.95. In other words, the wall thickness of the receiving portion 10 is about 1 / 10 to 19 / 20 of the wall thickness of the upper flange 15.

[0055] In step S3, the outer edge of the upper flange 15 of the formed container is punched and cut off (cutting process). Specifically, as follows... Figure 6C As shown, the upper flange is formed by cutting along the outer edge of the upper flange 15.

[0056] In step S4, the formed inner container 1 is removed from the mold (demolding).

[0057] The inner container formed through the above process is, for example, formed from a thin-walled sheet of 0.3 to 3.0 mm. Furthermore, after forming, the thickness of the upper flange 15 becomes 0.15 to 2.85 mm, and the thickness of the side portion 12 and the bottom surface 11 becomes 0.015 to 2.7 mm.

[0058] Here, for containers of the thickness that could previously be produced by injection molding, when fitted with a glass container, deviations in the glass container could lead to either an overly tight fit or an overly loose fit, making them prone to detachment. However, as mentioned above, the inner container, formed from a thin-walled sheet, is more flexible and adaptable than conventional injection-molded containers due to its thinness. Therefore, even if the outer container is made of glass, which is prone to manufacturing deviations, it can easily follow the molding deviations for fitting, thereby suppressing the aforementioned problems.

[0059] Furthermore, in this embodiment, since the upper part of the inner container storage section is polygonal, even if it is the exact size of the outer container, the cylindrical part of the inner container will not fit tightly against the inner side of the outer container storage section. Moreover, since the cross-section is polygonal, the side part is easy to bend, so it can be easily removed from the outer container.

[0060] (Modified example) Figure 7 This is a bottom perspective view of the inner container 1A of a modified embodiment of the present invention. In this modified embodiment, an outer peripheral ring 16, which is a short annular ring, is provided on the outer side of the upper flange 15 of the inner container 1A.

[0061] In manufacturing the inner container 1A of this structure, during the cutting process in step S3, the portion slightly (0.3~1mm) outside the outer edge of the protrusion P of the mold M is cut... Figure 6C The outer side of the middle 16 is cut into a circle when viewed from above, and the folded outer circumferential ring 16 is also cut off from the other parts of the sheet together with the upper flange 15 and the storage part 10.

[0062] In this structure, in the upper flange 15 with a circular outer edge, the distance di between the polygonal corner of the inner edge and the outer edge is relatively close, resulting in a narrower flange width; conversely, the distance dx between the center of the polygonal side of the inner edge and the outer edge is relatively far, resulting in a wider flange width. Furthermore, in the double-container state where the inner container 1A and the outer container 2 are joined, since the outer circumferential ring 16 is located outside the opening 24, the aforementioned distances di and dx are the same as or longer than the thickness of the opening 24.

[0063] <Second Implementation Method> Figure 8 This is a perspective view of the contents 1α of the second embodiment of the present invention.

[0064] In this embodiment, the side portion 12α of the inner container 1α has a lower, tapered side portion 13α with a diameter decreasing downwards, and an upper, wavy side portion 14α. A wavy side portion refers to a polygon with rounded corners and inwardly concave centers on each side, resembling a flower pattern. The polygon used as the basis for the wavy shape is preferably a regular 4 to 24-sided polygon.

[0065] Furthermore, in this embodiment, in the double container where the inner container 1α and the outer container 2 are joined, since the upper flange 15α of the inner container 1α is located above the upper end of the opening 24 of the outer container 2, the width of the upper flange 15α of the inner container 1α is the same size or wider than the thickness of the opening 24 of the outer container 2. Specifically, in this embodiment, since the upper part of the inner container's cylindrical body is corrugated, therefore... Figure 8 As shown, in the annular upper flange 15α, the distance diα between the rounded corners of the polygon and the outer edge is small, and the width is narrow. The distance dxα between the recessed portion of the polygonal side and the outer edge is large, and the width is wide. For example, although it is set according to the thickness of the opening 24 of the outer container 2, the width of diα is, for example, 0.5 to 3 mm, and dxα is larger than diα, which is 0.7 mm to 5 mm. With this shape, in the double container state, relative to the opening 24 of the outer container 2, the rounded corner portion contacts the inner edge or has a margin of about 0 to 2 mm, and the recessed portion has a margin of about 0.2 mm to 4 mm.

[0066] Furthermore, in this embodiment, the inner container 1α is also as described above. Figure 5 , Figures 6A to 6C As shown, it is formed from a thin-walled sheet of resin. Since the inner container 1α is formed by sheet molding, its thinness and flexibility allow it to be fitted with a glass container without easily falling off due to excessive tightness or looseness caused by glass manufacturing deviations. It can easily follow molding deviations for fitting.

[0067] Furthermore, in this embodiment, since the upper part of the side of the inner container 1α is a wavy side 14α, even if the outer container is the exact size, the cylindrical part of the inner container will not fit tightly against the inner side of the outer container storage part. Moreover, since the cross-section is a wavy polygonal shape, the side part is easy to bend, so it can be easily removed from the outer container when changing the replacement.

[0068] <Third Implementation Method> Figure 9 This is a perspective view of the contents 1β of the third embodiment of the present invention.

[0069] In this embodiment, the side portion 12β of the inner container 1β has a lower diameter tapering side portion 13β and an upper cylindrical side portion 14β.

[0070] A plurality of longitudinal ribs 17 extending in the vertical direction are provided on the outer peripheral surface of the cylindrical side 14β. When the longitudinal ribs 17 are engaged with the outer container 2, they are located inside the opening 24.

[0071] Furthermore, in this embodiment, in the double container where the inner container and outer container are joined, since the upper flange 15β of the inner container is located above the upper end of the opening 24 of the outer container 2, the width of the upper flange 15β of the inner container 1β is the same size or wider than the thickness of the opening 24 of the outer container 2. Specifically, in this embodiment, since the upper part of the inner container's cylindrical body is a typical cylindrical shape, therefore... Figure 9 As shown, both the outer and inner edges of the upper flange 15β are circular annular shapes. Therefore, although the width of the upper flange 15β is set according to the thickness of the opening 24 of the outer container 2, it is generally about 0.5 to 4 mm. In addition, since longitudinal ribs 17 are provided on the upper part of the side portion 12β, in the double container state, the outer side of the cylindrical side portion 14β does not contact the inner side of the opening 24 of the outer container 2, but the longitudinal ribs 17 contact the inner side of the opening 24.

[0072] Furthermore, in this embodiment, the inner container 1β is also as described above. Figure 5 , Figures 6A to 6C As shown, it is molded from a thin-walled sheet of resin, so even if the outer container is molded from glass which is prone to manufacturing deviations, it can be easily fitted to follow the manufacturing deviations of the glass.

[0073] Furthermore, in this embodiment, since multiple longitudinal ribs are provided on the upper part of the inner container 1β opposite to the opening of the outer container, even if the size is just right, the cylindrical part of the inner container will not fit tightly against the inner side of the outer container storage part. Moreover, the longitudinal ribs become protrusions that protrude outward when the storage part is taken as the cross section, and the side part is easy to bend. Therefore, when changing the replacement part, it can be easily taken out of the outer container.

[0074] <Fourth Implementation Method> Figure 10 This is a perspective view of the contents 1γ of the fourth embodiment of the present invention.

[0075] In this embodiment, the side portion 12γ of the inner container 1γ has a lower diameter tapering side portion 13γ that decreases downwards, and an upper cylindrical side portion 14γ.

[0076] An annular rib 18 extending in the circumferential direction is provided on the outer peripheral surface of the cylindrical side 14γ. When the annular rib 18 is engaged with the outer container 2, it is located inside the opening.

[0077] Furthermore, in this embodiment, in the double container where the inner container and the outer container are joined, since the upper flange of the inner container is located above the upper end of the opening of the outer container, the thickness of the upper flange of the inner container relative to the opening 24 of the outer container is the same or wider. Specifically, in this embodiment, similar to the third embodiment, the upper flange is annular in shape, and therefore the width of the upper flange 15γ is set according to the thickness of the opening 24 of the outer container 2, for example, about 0.5 to 4 mm. In addition, since annular ribs are provided on the upper part of the side surface, in the double container state, the outer side surface of the cylindrical side surface 14γ does not contact the inner side surface of the opening 24 of the outer container 2, but the annular ribs 18 contact the inner side surface of the opening 24.

[0078] Furthermore, in this embodiment, the inner container 1γ is also as described above. Figure 5 , Figures 6A to 6C As shown, it is molded from a thin-walled sheet of resin, so even if the outer container is molded from glass which is prone to manufacturing deviations, it can be easily fitted to follow the manufacturing deviations of the glass.

[0079] In addition, Figure 10 The image shows an example where the annular rib 18 is provided throughout the circumferential direction, but the annular ribs can also be provided intermittently in the circumferential direction. Alternatively, multiple ribs extending circumferentially in the vertical direction can also be provided.

[0080] (Example of a variation of the outer container) In the above Figure 2 In the middle, the thickness of the outer container opening is uniform, but a thinner wall section can also be provided on the outer periphery of the opening.

[0081] Reference Figure 11 In this structure, the opening 24δ of the outer container 2δ has thick-walled opening portions 27A and 27B and thin-walled opening portions 28A and 28B. The opening 24δ is an inner continuous circumferential surface, with the thickness of the outer surface varying in a stepped manner from the circumferential surface, and multiple thick-walled opening portions 27A and 27B and thin-walled opening portions 28A and 28B are alternately arranged. Specifically, the thin-walled opening portions 28A and 28B are elongated rectangular regions with partial outer recesses in the opening 24δ, extending from the upper end of the opening 24δ but not reaching the lower end. Therefore, in the opening 24δ, the lower side of the annular protrusions 26 of the thin-walled opening portions 28A and 28B has the same thickness as the thick-walled opening portions 27A and 27B.

[0082] When the inner container 1 described above is applied to the outer container of this structure, the upper flange 15 of the inner container 1 is also located above the upper end of the opening 24 of the outer container 2. The width of the upper flange 15 is the same as or wider than the thickness of the thick-walled portions 27A and 27B of the opening 24 of the outer container 2δ.

[0083] In this structure, when changing the replacement device, the inner container 1 is detached from the outer container 2δ by placing fingers on the thin-walled portions 28A and 28B of the opening of the outer container 2δ and pushing upward on the inner container 1 and the upper flange 15, or by pulling upward on the upper flange 15.

[0084] In addition, Figure 11 In the example shown, two thin-walled opening portions 28 are provided at the opening 24δ of the outer container 2δ, but there may be one or more thin-walled opening portions.

[0085] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to this specific embodiment. Various modifications and alterations can be made within the scope of the spirit of the embodiments of the present invention as described in the claims.

[0086] This application claims priority based on Japanese Patent Application No. 2023-219987, filed on December 26, 2023, the entire contents of which are incorporated herein by reference.

[0087] Explanation of reference numerals in the attached figures 1, 1A, 1α, 1β, 1γ Inner Vessels 10, 10α, 10β, 10γ storage sections 11 Bottom 12, 12α, 12β, 12γ Lateral face 13, 13α, 13β, 13γ Side surfaces with reduced diameter 14. Side view of the polygonal tube 14α Wavy side 14β, 14γ cylindrical side 15 Upper flange 17. Longitudinal ribs 18 circumferential ribs 2, 2δ outer container 20. Shell section 21 bottom wall 22 Sidewalls 23 Shoulders 24 Mouth (cylindrical mouth) 25 Threaded protrusion 26 Annular protrusions 27A, 27B Thick-walled portion of the mouth (thick-walled portion) 28A, 28B Mouth thin-walled portion (thin-walled portion) 3. Double container 4. Lid 5. Gasket (sealing material) 6 Double-sided container with lid M mold

Claims

1. A double container having: The outer container and the inner container, which can be stored as replacements relative to the outer container, The outer container has a bottom wall, side walls, and a cylindrical opening located above the side walls. The inner container has a bottom surface, a side surface, and an upper flange that projects radially outward from the upper end of the side surface. The inner container is made of a sheet of synthetic resin. In the double-container configuration where the outer container contains the inner container, the upper flange of the inner container is positioned above the upper end of the opening of the outer container. The outer periphery of at least the upper part of the side portion of the inner container is polygonal.

2. A double container having: The outer container and the inner container, which can be stored as replacements relative to the outer container, The outer container has a bottom wall, side walls, and a cylindrical opening located above the side walls. The inner container has a bottom surface, a side surface, and an upper flange that projects radially outward from the upper end of the side surface. The inner container is made of a sheet of synthetic resin. In the double-container configuration where the outer container contains the inner container, the upper flange of the inner container is positioned above the upper end of the opening of the outer container. The outer periphery of the side portion of the inner container is wavy.

3. A double container having: The outer container and the inner container, which can be stored as replacements relative to the outer container, The outer container has a bottom wall, side walls, and a cylindrical opening located on the side walls, with a diameter smaller than that of the side walls. The inner container has a bottom surface, a side surface, and an upper flange that projects radially outward from the upper end of the side surface. The inner container is made of a sheet of synthetic resin. The outer periphery of the side portion of the inner container is provided with multiple longitudinal ribs. In the state of a double container where the outer container contains the inner container, the upper flange of the inner container is located above the upper end of the opening of the outer container, and the plurality of longitudinal ribs of the inner container are located inside the opening of the outer container.

4. A double container having: The outer container and the inner container, which can be stored as replacements relative to the outer container, The outer container has a bottom wall, side walls, and a cylindrical opening located on the side walls, with a diameter smaller than that of the side walls. The inner container has a bottom surface, a side surface, and an upper flange that projects radially outward from the upper end of the side surface. The inner container is made of a sheet of synthetic resin. The outer periphery of the side surface is provided with annular ribs. In the state of a double container where the outer container contains the inner container, the upper flange of the inner container is located above the upper end of the opening of the outer container, and the annular rib of the inner container is located inside the opening of the outer container.

5. The double container according to any one of claims 1 to 4, wherein the outer container is formed of glass.

6. A replacement container, which can be interchangeably stored relative to an outer container having a cylindrical opening. The replacement container has a bottom surface, side surfaces, and an upper flange that projects radially outward from the upper end of the side surfaces. The replacement container is made of sheets of synthetic resin. The outer periphery of at least the upper part of the side surface is polygonal.

7. A replacement container, which is replaceably housed relative to an outer container comprising a peripheral wall having a cylindrical inner circumferential surface. The replacement container has a bottom surface, side surfaces, and an upper flange that projects radially outward from the upper end of the side surfaces. The replacement container is made of sheets of synthetic resin. The outer periphery of at least the upper part of the side surface is wavy.

8. A replacement container, which is replaceably housed relative to an outer container comprising a peripheral wall having a cylindrical inner circumferential surface. The replacement container has a bottom surface, side surfaces, and an upper flange that projects radially outward from the upper end of the side surfaces. The replacement container is made of sheets of synthetic resin. The outer peripheral surface of the side portion is provided with a plurality of longitudinal ribs at least on the upper part.

9. A replacement container, which is replaceably housed relative to an outer container comprising a peripheral wall having a cylindrical inner circumferential surface. The replacement container has a bottom surface, side surfaces, and an upper flange that projects radially outward from the upper end of the side surfaces. The replacement container is made of sheets of synthetic resin. At least the upper part of the outer peripheral surface of the side portion is provided with annular ribs.

10. The replacement container according to any one of claims 6 to 9, wherein the side portion has a tapered side portion that tapers downwards near the bottom surface.

11. A method for manufacturing a replacement container, the replacement container being replaceably housed relative to an outer container, the method comprising: The process of heating thin-walled sheets made of synthetic resin. For a mold with a recess communicating with a vacuum hole, the sheet is brought close together and vacuum and pressure formed to shape the sheet into a container shape. The outer side of the container is cut off through punching. In the mold, the inner wall surface forming the recess has a polygonal or wavy shape when viewed from above. The molded container has a recessed, polygonal, or wavy side that is concave relative to the outside. During the cutting process, a specified interval is made from the upper end of the side of the storage part outward to form an upper flange, while simultaneously cutting it into a circle as viewed from above.

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