Double container, double container with cap, refill container, and method for manufacturing refill container

Abstract

A double container 3 has an outer container 2 and an inner container 1 that is accommodated so as to be replaceable as a refill with respect to said outer container 2. The outer container 2 has: a bottom wall; a side wall; and a cylindrical mouth part that is positioned above the side wall. The inner container 1 has: a bottom surface; a side surface; an upper-end flange 13 which protrudes radially outward from the whole circumference of the upper-end part of the side surface; and a plurality of arc-shaped hanging parts 15 which hang down from the outer edge of the upper-end flange 13, and which are intermittently provided in the circumferential direction. The inner container 1 is composed of a resin sheet material, and on the upper surface of the upper-end flange 13 of the inner container 1, an annular protrusion part 14 protruding upward is provided. In the mouth part of the outer container 2, the upper end is an upper-end thin part 25 in which the outer side is thinner than a lower part. The lower side of the upper-end thin part 25 is a mouth-part thick part 26, and the mouth-part thick part 26 is provided with a screw projection 27 which a cap 4 having a female screw 43 can be screwed on and engaged with. In a state where the inner container 1 is fitted to the outer container 2, the upper-end flange 13 and the plurality of arc-shaped hanging parts 15 hold the upper-end thin part of the outer container 2. In a state where the cap 4 is engaged with the double container 3, the annular protrusion part 14 is directly or indirectly brought into close contact with the cap 4.

Description

Double container, double container with cap, refill container, and method for manufacturing refill container

[0001] The present invention relates to a double container, a double container with a cap, a refill container, and a method for manufacturing a refill container.

[0002] In recent years, in the field of cosmetics, the use of double-layered containers with replaceable inner containers has become widespread in order to conserve resources from the perspective of the Sustainable Development Goals (SDGs). The resin inner containers used in such double-layered containers have often been manufactured by injection molding. Furthermore, in order to achieve more sustainable specifications, such as reducing the amount of resin used, a technology has been disclosed in which the inner container is molded by thermoforming from a sheet (for example, Patent Document 1).

[0003] In the technology of Patent Document 1, a set ring 9 made of an elastic material such as elastomer or rubber is arranged as a sealing member at the upper end of the mouth of the outer container 8. The set ring 9 contacts an engaging portion 7a that is folded outward from the upper end of the inner container 7 and cooperates with the cap to seal the inside of the inner container.

[0004] Patent No. 4248774

[0005] However, since the inner container 7 formed by sheet molding, more specifically thermoforming from a sheet, is thin, if an elastic body 9 is provided at the upper end of the side wall of the outer container 8 to engage with the sheet-molded inner container, as in Patent Document 1, the support from the elastic body 9 at the part in contact with the elastic body 9 is weak when the cap is closed, and there is a risk that the airtightness will not be sufficient.

[0006] In view of the above circumstances, the present invention has an object to provide a double-container refill container in which the inner container is formed from a sheet and the cap can be kept airtight with the outer container.

[0007] In order to solve the above problems, one aspect of the present invention provides a double container having an outer container and an inner container that is replaceably accommodated in the outer container as a refill, wherein the outer container has a bottom wall, a side wall, and a cylindrical mouth portion located on the side wall, the inner container has a bottom surface, a side surface, an upper end flange that protrudes radially outward from the entire periphery of the upper end of the side wall, and a plurality of arc-shaped hanging portions that hang down from the outer edge of the upper end flange and are provided intermittently in the circumferential direction, the inner container is made of a resin sheet material, the upper surface of the upper end flange of the inner container is provided with an annular protrusion that protrudes upward, the upper end of the mouth portion of the outer container is a thin-walled upper end portion that is thinner on the outside than the lower portion, and the lower side of the thin-walled upper end portion is a thick-walled mouth portion, and the thick-walled mouth portion of the outer container is provided with a screw protrusion that can be threadably engaged with a cap having a female thread, When the inner container is attached to the outer container, the upper flange and the plurality of arc-shaped hanging parts embrace the upper thin-walled part of the outer container, and when the cap is engaged with the double container, the annular convex part comes into direct or indirect contact with the cap.

[0008] According to one embodiment, in a double container, even if the inner container is formed by sheet molding, the inner container can be airtight with respect to the cap.

[0009] FIG. 1 is a cross-sectional view of a double container including an inner container of a conventional example. FIG. 2 is a perspective view of a double container according to an embodiment. FIG. 3 is a cross-sectional view of a double container with a cap according to an embodiment. FIG. 4 is a perspective view of an inner container according to an embodiment. FIG. 5 is a front view of an outer container according to an embodiment. FIG. 6 is a flow chart of a method for manufacturing an inner container according to an embodiment. FIG. 7 is a cross-sectional explanatory view of a method for manufacturing an inner container according to an embodiment. FIG. 8 is a cross-sectional explanatory view of a method for manufacturing an inner container according to an embodiment. FIG. 9 is a cross-sectional explanatory view of a method for manufacturing an inner container according to an embodiment. FIG. 10 is a top view and a perspective explanatory view of a method for manufacturing an inner container according to an embodiment. FIG. 11 is a top view and a perspective explanatory view of a method for manufacturing an inner container according to an embodiment.

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following describes embodiments of the present invention with reference to the accompanying drawings. In the following drawings, the same components are designated by the same reference numerals, and redundant explanations may be omitted.

[0011] The present invention relates to a double-walled container, particularly a double-walled container for storing a viscous or solid substance. The inner container of the double-walled container is a sheet-formed resin container, which may or may not be self-supporting. The outer container of the double-walled container is a self-supporting container, preferably made of glass, but may also be made of wood, resin, silicone, metal, paper, etc.

[0012] It is preferable that the contents placed in the inner container held by the outer container of the double container of the present invention are not single-use items such as cosmetics, perfumes, detergents, seasonings, etc., but viscous or solid substances that are to be used in portions.

[0013] In this specification, viscous substances refer to viscous cosmetics such as viscous creams, hair waxes, ointments, viscous medicines, viscous soaps, etc. Solid substances refer to solid or semi-solid cosmetics such as particularly hard hair sticks, hair waxes, and solid beauty serums (for example, those with a similar hardness to stick beauty serums), as well as solid soaps, cheese, butter, and other foods.

[0014] In the present invention, the viscous or solid substance is filled in the storage section in advance, and the inner container is set in the outer container in advance, or the viscous or solid substance is filled by replacing the inner container as a refill (refill container).

[0015] <Overall Configuration of the Embodiment> First, the overall configuration of the double container according to the embodiment of the present invention will be described using Fig. 2 to Fig. 5. Fig. 2 is a perspective view of the double container according to the embodiment of the present invention. Fig. 3 is a cross-sectional view of the double container with a cap according to the embodiment. Fig. 4 is a perspective view of the inner container according to the embodiment. Fig. 5 is a front view of the outer container according to the embodiment.

[0016] The double container 3 according to the present invention comprises an inner container 1 and an outer container 2. The double container 3 shown in Fig. 2 has a wide-mouthed, low-profile jar shape. The double container 3 can be engaged with a cap 4 (see Fig. 3).

[0017] In this embodiment, the inner container 1 comprises a cylindrical storage section 10 with a bottom, a bottom surface 11, and a side surface 12, an upper flange 13 that projects outward from the upper end of the side surface 12, and a plurality of arc-shaped hanging portions 15 that are provided at regular intervals from the outer edge of the upper flange 13. An annular protrusion 14 is provided on the upper surface of the upper flange 13. More specifically, as shown in Figure 3, the upper flange 13 has a uniform thickness, and the annular protrusion 14 that protrudes from the upper surface is formed by vacuum molding, which will be described later, resulting in a recessed lower surface.

[0018] In each of the plurality of arcuate hanging portions 15, outer edge portion 15E of the outer edge (outer surface) is raised outward more than other portions. Arcuate hanging portion 15 has a rectangular shape when viewed from the front, and inner surface 15I of arcuate hanging portion 15 is inclined so as to protrude radially inward as it approaches the bottom.

[0019] The inner container 1 is formed by sheet molding of a thin resin sheet. The resin constituting the inner container 1 may be, for example, a polyester resin such as polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene (ABS), polybutylene terephthalate (PBT), polyacetal (POM), or polyethylene terephthalate (PET), polycarbonate (PC), an acrylic resin (PMMA), or a biodegradable resin.

[0020] The outer container 2 is a container housing portion that replaceably houses the inner container 1. The outer container 2 has a case portion 20 having a bottom wall 21 and a side wall 22. In the outer container 2, a shoulder portion 23 extending outward is provided at the upper end of the case portion 20, and a cylindrical mouth portion 24 extending upward is provided from the inner edge of the shoulder portion 23. As shown in Figures 2 and 3 , the cylindrical mouth portion 24 has a smaller diameter than the side wall 22 of the case portion 20 and is located more inward than the side wall 22.

[0021] As shown in Fig. 3, the mouth 24 of the outer container 2 has a thin upper portion 25 at the upper end and a thick mouth portion 26 at the other portion. A screw projection 27 is provided on the thick mouth portion 26. As shown in Fig. 3, the screw projection 27 of the outer container 2 is threadably engaged with a screw projection 43 of the cap 4.

[0022] The upper thin-walled portion 25 of the mouth 24 has a different thickness at the top and bottom, and the outer surface of the upper thin-walled portion 25 is inclined so that the upper end is located on the outer diameter side and the boundary with the lower mouth thick-walled portion 26 is located on the inner diameter side, as shown in Figure 5. In other words, the outer surface of the upper thin-walled portion 25 is an inclined surface that widens outward as it approaches the upper end.

[0023] The outer container 2 of the present invention is preferably made of glass, but may also be made of resin, glass, wood, silicon, metal, paper, etc. In the case of resin, it may be made of, for example, polyester resins such as PP, PE, ABS, PBT, POM, PET, etc., or PC, PMMA, or biodegradable resins, as with the inner container 1 described above. In the case of wood, for example, coniferous wood such as cedar, cypress, and pine, and hardwood wood such as oak, walnut, black cherry, alder, and rubberwood, as well as bamboo, are included. In the case of paper, for example, it may be self-supporting cardboard.

[0024] 3, the cap 4 has a top surface 41 and a peripheral wall 42, and a screw protrusion (female thread) 43 is provided on the inside of the peripheral wall 42. In Fig. 3, the upper surface of the top surface 41 is hemispherically convex upward, and the outer surface of the peripheral wall 42 widens downward. However, the shape of the cap is not limited to this, and the top surface of the top surface may be flat, and the outer surface of the peripheral wall may also have a shape with a constant diameter.

[0025] The cap 4 of the present invention is a lid that covers the upper flange 13 of the inner container 1 and the cylindrical opening 24 of the outer container 2, and is made of polyester resins such as PP, PE, ABS, PBT, POM, PET, etc., or resins such as PC, PMMA, or biodegradable resins, glass, wood, silicon, metal, paper, etc.

[0026] 3, a packing 5, which is a sealing material for preventing leakage, may be provided on the inside (lower side) of the top surface 41 of the cap 4. The packing 5 may be provided by adhering it to the cap 4, or may be provided separately from the cap 4. The packing 5 is formed of, for example, elastic rubber or resin (for example, PP or PE).

[0027] When the cap 4 is engaged with the double container 3, the screw projections 27 on the opening 24 of the outer container 2 and the screw projections 43 on the cap 4 are threadably engaged. At this time, the gasket 5 is engaged in a state sandwiched between the underside of the top surface 41 of the cap 4 and the upper flange 13 of the inner container 1.

[0028] In this embodiment, an annular convex portion 14 is provided on the upper surface of the upper flange 13 of the inner container 1, and arcuate hanging portions 15 are provided intermittently from the outer edge of the upper flange 13, so that the arcuate hanging portions 15 and the upper flange 13 embrace the thin upper portion 25 of the outer container 2, thereby engaging the double container 3. When the cap 4 is engaged, the annular convex portion 14 comes into close contact with the packing 5, making the capped double container 6 airtight, i.e., sealed to prevent air from entering or leaving.

[0029] In the example of Figure 3, the cap 4 and double container 3 are engaged while the annular protrusion 14 of the upper flange 13 is tightly fitted with the elastic packing 5 to create an airtight state, so the contents will not leak even if the capped double container 6 is tilted or turned upside down.

[0030] If the packing 5 is not provided, the annular protrusion 14 of the upper flange 13 directly contacts the top surface of the cap 4, and the cap 4 and the double container 3 engage, creating an airtight state. In this case, too, the contents will not leak even if the capped double container 6 is tilted or turned upside down.

[0031] Here, the inner container 1 is a replaceable (detachable and replaceable) refill (also called a refill) together with the viscous or solid substance contained therein, while the outer container 2, cap 4, and packing 5 are reused after the refill replacement.

[0032] Therefore, the empty inner container 1 can be replaced with a new refill of the same shape, and the outer container 2 can be used repeatedly.

[0033] The inner container 1 that can be replaced as a replacement refill can have its top surface covered with a film stretched over the upper flange 13 or a cover that surrounds the upper flange 13. This allows the inner container 1 that is a refill to be distributed as a single unit.

[0034] 2 and 3, in the double container 3 in which the inner container 1 and outer container 2 are engaged, the upper flange 13 of the inner container 1 is located above the upper end of the thin upper portion 25 of the mouth 24 of the outer container 2. Therefore, the width of the upper flange 13 of the inner container is the same size as or wider than the thickness of the thin upper portion 25 of the mouth 24 of the outer container 2.

[0035] When engaging the inner container 1 configured as described above with the outer container 2, the user pushes the upper flange 13 of the inner container 1 from above into the outer container 2. At this time, the inclined inner surface 15I of the arc-shaped hanging portion 15 of the inner container 1 comes into contact with the outer surface of the thin-walled upper portion 25. As a result, the upper flange 13 and arc-shaped hanging portion 15 of the inner container 1 embrace and cover the thin-walled upper portion 25 of the outer container 2.

[0036] The inclined inner surface 15I of arc-shaped hanging portion 15 embraces the inclined outer surface of upper thin-walled portion 25 to form an undercut fit, thereby maintaining the state of double container 3. For example, even if the outside of arc-shaped hanging portion 15 is gripped while double container 3 is in the state of being, inner container 1 will not come off outer container 2 because of the undercut fit between arc-shaped hanging portion 15 and upper thin-walled portion 25, and unintentional disengagement of double container 3 can be prevented.

[0037] Alternatively, if annular protrusion 14 of inner container 1 is attached to packing 5 when cap 4 is rotated in the opening direction, tapered contact between inner surface 15I of arcuate hanging portion 15 and outer surface of thin-walled upper end portion 25 will cause inner container 1 to rotate relative to outer container 2, but will not cause inner container 1 to come off upward relative to outer container 2. Here, in order to achieve the above-mentioned retaining effect, the undercut fitting force between arcuate hanging portion 15 and thin-walled upper end portion 25 needs to be stronger than the adhesive force between packing 5 and annular protrusion 14.

[0038] It is preferable that the inclination angles of inner surface 15I of arcuate hanging portion 15 and the outer surface of upper thin-end portion 25 are approximately the same. "Similar angles" means the same angle ±5°. Both inner surface 15I of arcuate hanging portion 15 and the outer surface of upper thin-end portion 25 have an inclination angle of, for example, 3° to 40°, and more preferably 5° to 35°, relative to the vertical direction.

[0039] Conversely, when replacing the refill, the user places his or her fingers on the thin upper portion 25 of the outer container 2 and pushes up the outer edge of the upper flange 13 where the arcuate hanging portion 15 is not provided, thereby releasing the tapered contact between the arcuate hanging portion 15 and the thin upper portion 25 and separating the inner container 1 from the outer container 2. In this way, in the double container of the present invention, the inner container 1 can be easily released from the outer container 2 when replacing it as a refill.

[0040] 4 shows an example in which six arcuate hanging portions 15 are provided on the inner container 1, including one on the far side (not shown), but any number of arcuate hanging portions 15 may be provided as long as they are two or more. However, because the upper flange 13 and the arcuate hanging portions 15 embrace the upper thin-walled portion 25 with their inclined surfaces as described above, thereby engaging the inner container 1 with the outer container 2, it is preferable that the total area in the circumferential direction of the outer edge of the upper flange 13 where the multiple arcuate hanging portions 15 are provided is approximately 30% to 90%, and more preferably 50% to 80%.

[0041] <Manufacturing of Inner Container> Next, a method for manufacturing an inner container in the first embodiment will be described using Figures 6, 7A to 7D, and 8A to 8C. Figure 6 is a flowchart of the method for manufacturing an inner container according to the embodiment. Figures 7A to 7D are cross-sectional explanatory views of the method for manufacturing an inner container according to the embodiment. Figures 8A to 8C are top and perspective explanatory views of the method for manufacturing an inner container according to the embodiment.

[0042] 7A to 7D, Fig. 7A is an explanatory diagram of step S1, Fig. 7B is a schematic explanatory diagram of step S2, and Figs. 7C and 7D are detailed explanatory diagrams of step S3. Also, in Figs. 8A to 8C, Fig. 8A is a top view of the mold M of Fig. 7A, Fig. 8B is a diagram of the container after a portion of the sheet has been formed into a container shape after step S2, and Fig. 8C is a top view of step S3. While Figs. 7A and 7B show the mold M in schematic form, in detail, the mold M has different shapes in cross section A and cross section B, as shown in Figs. 7C, 7D, and 8A.

[0043] First, in step S1 of Fig. 6, a thin resin sheet S is heated (Fig. 7A). The thickness of the resin sheet S before heating is about 0.3 to 3.0 mm, and heating makes the sheet easier to stretch.

[0044] In step S2, the resin sheet S is brought close to the mold M and sucked from below the mold M, and vacuum and pressure molding is performed by air pressure or a pressing force from a plug from above the mold (FIG. 7B).

[0045] The mold used in this molding process will be described in detail with reference to Figures 7C, 7D, and 8A. Figure 7C is a cross-sectional view of Figure 8C taken from surface A and passing through arcuate hanging portion 15S, while Figure 7D is a cross-sectional view of Figure 8C taken from surface B and not passing through arcuate hanging portion 15S.

[0046] The mold M used in this manufacturing method has a recess R formed therein, and a protrusion P is provided around the recess R. In this embodiment, the recess R formed in the mold M is a recess with rounded corners at the bottom end, similar to the storage section of the inner container 1. Here, the amount of recession of the recess R in the mold M relative to the outside is larger than the amount of protrusion of the protrusion P relative to the outside, and is about 5 to 20 times larger.

[0047] 8A, the protrusions P provided around the recesses R have a circular inner edge and a circular outer edge that is partially recessed in the circumferential direction. The non-recessed outer edge of the protrusions P is referred to as a wide protrusion Pa, and the recessed outer edge is referred to as a narrow protrusion Pb.

[0048] Furthermore, in the convex portion P, the outer surface of the intermittently recessed narrow recess Pb forms an inclined outer surface Ps that slopes downward toward the inner diameter as it goes down, as shown in Fig. 7C. An arc-shaped drooping portion 15S is formed on the outside of the inclined outer surface Ps. On the other hand, the outer surface of the wide convex portion Pa of the convex portion P, whose outer edge is not recessed in the circumferential direction, forms a vertical outer surface Pv that rises vertically, as shown in Fig. 7D.

[0049] Furthermore, an annular rib Pp is provided on the upper surface of the protrusion P, protruding upward in an annular shape.

[0050] Furthermore, the mold M is formed with a plurality of thin holes H for vacuuming. Of the vacuum holes H, the vacuum hole H1 on the lower side of the mold M is in communication with the recessed portion R, and the vacuum holes H2 (H2a, H2b) on the outer side are not in communication with the recessed portion R. Note that although Figures 7A and 7B show a configuration in which the vacuum holes H1 and H2 (H2a, H2b) are in communication within the mold M, in the mold M, the vacuum holes H1 and H2 (H2a, H2b) may not be in communication with each other and may extend independently to the lower end of the mold M.

[0051] 7A and 7B, vacuum hole H2 is shown as a straight line, but as shown in more detail in Figures 7C and 7D, vacuum hole H2 curves outward at its upper end. Vacuum hole H2b, which passes through narrow protrusion Pb to form arc-shaped hanging portion 15S shown in Figure 7C in accordance with the thickness (width) of protrusion P, has a shorter portion extending laterally at its upper end than vacuum hole H2a, which passes through wide protrusion Pa shown in Figure 7D.

[0052] A thin resin sheet S is brought close to the mold M and sucked from below the mold M, whereby the resin sheet S is stretched along the recessed portion R of the mold M to form the accommodating portion 10. In addition, outside the recessed portion R of the mold M, the resin sheet S is sucked by vacuum holes H2a and H2b, whereby the resin sheet S is stretched along the protruding portion P of the mold M.

[0053] As a result, an upper flange portion 13S is formed above the upper surface of the protrusion P, an arcuate hanging portion 15S is formed along the inclined outer side surface Ps of the protrusion P, and a temporary outer peripheral ring OR is formed along the vertical outer side surface Pv of the protrusion P. At this time, the portion of the sheet S facing the annular rib Pp of the protrusion P is stretched by vacuum molding to form an annular protrusion 14 that protrudes from the upper surface of the upper flange portion 13S, resulting in a recess on the lower surface. Figure 8B is a top perspective view of a resin container with an outer rim formed on a mold from the sheet in this manner.

[0054] In step S3, the molded container is punched and cut into a circular shape in top view (separation step). More specifically, as shown in the dashed lines in Fig. 8C and Figs. 7C and 7D, a portion of the convex portion P that is inside the outer edge of the non-recessed wide convex portion Pa and slightly outside the outer edge of the recessed narrow convex portion Pb is cut into a circular shape in top view.

[0055] As a result, an upper end flange 13 provided with an annular protrusion 14 is formed by the upper side of the upper surface of the protrusion P. In addition, an arc-shaped hanging portion 15 is formed outside the inclined outer side surface Ps of the narrow protrusion Pb of the protrusion P.

[0056] By cutting into a circle in this manner, the formed upper flange 13 and the arcuate hanging portion 15 are separated together with the receiving portion 10 from the rest of the sheet, including the temporary outer peripheral ring OR.

[0057] In addition, the boundary portion with the outer ring OR and the portion where there is a difference in outer diameter between the concave narrow convex portion Pb and the non-concave wide convex portion Pa at the outer edge of the convex portion P of the mold become outer edge portion 15E, which is a bulge of the outer edge on the outer surface of the arc-shaped hanging portion 15, and is slightly thicker than the center of the outer surface of the arc-shaped hanging portion 15.

[0058] Furthermore, since the sheet deforms more in the storage section 10 formed along the recessed section R than in the upper flange 13 and arcuate hanging section 15 formed along the protruding section P, the bottom surface 11 and side surface 12 constituting the storage section 10 are thinner than the upper flange 13 and arcuate hanging section 15. For example, if the thickness of the thin sheet S before forming is 1, the thickness of the storage section 10 is 0.05 to 0.9, and the thickness of the upper flange is about 0.5 to 0.95. In other words, the thickness of the storage section 10 is about 1 / 10 to 19 / 20 of the thickness of the upper flange 13.

[0059] In step S4, the cut inner container 1 is released from the mold (demolded).

[0060] The inner container formed by the above process is made from a thin sheet, for example, 0.3 to 3.0 mm thick. After forming, the thickness of the upper flange 13 and the arcuate hanging portion 15 excluding the outer edge 15E is 0.15 to 2.85 mm, and the thickness of the side surface 12 and the bottom surface 11 is 0.015 to 2.7 mm.

[0061] However, with containers of a thickness that can be produced by conventional injection molding, variations in the thickness of the glass container can cause the fit to be too tight or too loose, resulting in easy separation. However, the inner container molded from a thin sheet as described above uses less resin than conventional injection-molded containers due to its thinness, and is soft and highly flexible. Therefore, even if the outer container is molded from glass, which is prone to manufacturing variations, the inner container can easily adapt to molding variations and fit, thereby preventing the above problems from occurring.

[0062] Furthermore, in this embodiment, an arc-shaped hanging portion 15 is provided adjacent to the upper flange 13 of the formed inner container housing, and the inner surface 15I of this arc-shaped hanging portion 15 is inclined so that it approaches inward as it goes downward for engagement. As a result, the arc-shaped hanging portion 15 embraces the outer surface of the inclined upper thin-walled portion 25 of the outer container 2 in an undercut manner, thereby ensuring secure engagement. As a result, even if the upper flange 13 comes into close contact with the packing 5 after, for example, a typhoon or other fluctuation in air pressure around the capped double container 6 or after the container is turned upside down, the cap 4 will not move upward, and the engaged state of the double container 3 can be maintained.

[0063] On the other hand, in this configuration, since the arc-shaped hanging portions 15 of the inner container 1 are provided intermittently when the double container is in a state where the storage portion 10 of the inner container 1 is sized to fit snugly with the outer container 2, when removal is intended, the inner container 1 can be easily removed from the outer container 2 by applying a direct force to the outer edge of the upper end flange 13 in the portion where the arc-shaped hanging portions 15 are not present.

[0064] Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes are possible within the scope of the gist of the embodiments of the present invention described in the claims.

[0065] This application claims priority based on Japanese Patent Application No. 2024-000274, filed on January 4, 2024, the entire contents of which are incorporated herein by reference.

[0066] DESCRIPTION OF SYMBOLS 1 Inner container 10 Storage section 11 Bottom surface 12 Side surface 13 Upper end flange 14 Annular convex portion 15 Arc-shaped hanging portion 15E Outer edge portion 15I Inner surface 2 Outer container 20 Case portion 21 Bottom wall 22 Side wall 23 Shoulder portion 24 Mouth portion (cylindrical mouth portion) 25 Upper end thin portion 26 Mouth portion thick portion 27 Screw projection 3 Double container 4 Cap 43 Screw projection (female thread) 5 Packing (sealing material) 6 Double container with cap M Mold Pa Wide convex portion Pb Narrow convex portion

Claims

1. A double container having an outer container and an inner container that is removably accommodated as a refill in the outer container, wherein the outer container has a bottom wall, a side wall, and a cylindrical mouth portion located on the side wall, the inner container has a bottom surface, a side surface, an upper end flange that projects radially outward from the entire circumference of the upper end portion of the side surface, and a plurality of arcuate hanging portions that hang down from the outer edge of the upper end flange and are intermittently provided in the circumferential direction, the inner container is made of a resin sheet material, an annular convex portion that projects upward is provided on the upper surface of the upper end flange of the inner container, at the mouth portion of the outer container, the upper end is an upper end thin-walled portion where the outer side is thinner than the lower side, and the lower side of the upper end thin-walled portion is a mouth portion thick-walled portion, a screw projection that can be screwed and engaged with a cap having a female screw is provided on the mouth portion thick-walled portion of the outer container, in a state where the inner container is mounted on the outer container, the upper end flange and the plurality of arcuate hanging portions hold the upper end thin-walled portion of the outer container, and in a state where the cap is engaged with the double container, the annular convex portion is in direct or indirect contact with the cap. A double container.

2. The inner surface of the arcuate hanging portion of the inner container is an inclined surface that is located on the inner diameter side as it goes downward, the outer surface of the upper end thin-walled portion of the outer container is an inclined surface that spreads outward as it goes upward, and in a state where the inner container is mounted on the outer container, the inner surface of the arcuate hanging portion and the outer surface of the upper end thin-walled portion are in contact. The double container according to claim 1.

3. The inclination angles of the inner surface of the arcuate hanging portion of the inner container and the outer surface of the upper end thin-walled portion of the outer container are about the same and are inclined at 3° to 40° with respect to the vertical direction. The double container according to claim 2.

4. In the circumferential direction of the outer edge of the upper end flange of the inner container, the total of the regions where the plurality of arcuate hanging portions are provided is 30% to 90%. The double container according to claim 1.

5. A double container with a cap, comprising the double container according to any one of claims 1 to 4 and a cap having a female screw that can be screwed and engaged with the mouth portion of the outer container.

6. When a sealing material is provided on the lower surface of the top surface of the cap, in a state where the cap is engaged with the double container, the annular convex portion is in contact with the cap via the sealing material. The double container with a cap according to claim 5.

7. A refill container that is removably accommodated in an outer container, having a bottom surface, a side surface, an upper end flange that protrudes radially outward from the entire circumference of the upper end of the side surface, and a plurality of arcuate hanging portions that hang down from the outer edge of the upper end flange and are intermittently provided in the circumferential direction. The refill container is made of a resin sheet material, and an annular convex portion protruding upward is provided on the upper surface of the upper end flange. Refill container.

8. The refill container according to claim 7, wherein the inner surface of the arcuate hanging portion is an inclined surface that is located on the inner diameter side as it goes downward.

9. A method for manufacturing a refill container that is removably accommodated in an outer container, comprising the steps of setting a resin sheet material in a mold having a recess, vacuum and pressure molding the mold to form the sheet material into a container shape, punching to separate the formed refill container, and a demolding step of removing the separated refill container from the mold. In the mold, a substantially annular convex portion protruding with a predetermined width and protruding more than the outer portion is formed at the peripheral edge of the recess, and a part of the convex portion is a narrow convex portion with an intermittently concave outer edge. An annular rib is provided on the upper surface of the convex portion. In the separating step, by circularly separating a portion that is slightly inside the non-recessed outer edge of the convex portion and outside the outer edge of the recessed narrow convex portion in a top view, an upper end flange is formed by the upper side of the convex portion. The portion of the upper end flange facing the annular rib of the convex portion has a convex portion formed on the upper surface while the lower surface is concave. An arcuate hanging portion is formed on the outer surface of the narrow convex portion of the convex portion. Method for manufacturing a refill container.

10. In the mold, the outer surface of the narrow convex portion of the convex portion is an inclined surface, and the outer edge of the non-recessed portion of the outer edge of the convex portion is a vertical surface. Along the inclined surface, the inner surface of the arcuate hanging portion is formed as an inclined surface that is located on the inner diameter side as it goes downward. The method for manufacturing a refill container according to claim 9.

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