Double container

Abstract

To provide a double container that enhances the freedom of selection for the discharge member to be attached to the double container.SOLUTION: The double container includes: a container body; an adapter; and a discharge member, where the container body comprises an inner bag and an outer shell arranged to cover the inner bag, the discharge member having a discharge port for discharging the contents within the inner bag, and the adapter being configured to be engageable with both the container body and the discharge member.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a dual container. [Background technology]

[0002] Conventionally, a double container having a container body with an outer shell and an inner bag is known. For example, Patent Document 1 discloses a method of manufacturing a container body having an inner bag and an outer shell covering it by biaxially stretching and blow molding a preform formed by covering an inner preform with an outer preform. In the configuration of Patent Document 1, a discharge member attached to the mouth of the container body includes a main body part and a band part, and by removing the band part engaged with the outer shell, it is possible to rotate the main body part engaged with the inner bag together with the inner bag and pull out the inner bag. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2023-26868 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in a double container in which it is assumed that the inner bag will be pulled out from the container body as in Patent Document 1, the shape of the engagement part provided at the mouth of the double container may be special, or the outer diameter of the mouth may be larger than that of a general container such as a PET bottle. In such cases, a standardized cap cannot be used, and a cap must be developed independently. However, there is a problem that developing a cap independently tends to increase both the development cost and the manufacturing cost. The same problem occurs when a discharge member other than a cap (a member having a discharge port), such as a pump, is attached to the double container.

[0005] The present invention has been made in consideration of the above circumstances, and provides a double container that allows greater freedom in selecting a discharge member to be attached to the double container. [Means for solving the problem]

[0006] According to the present invention, the following inventions are provided. [1] A double container comprising a container body, an adapter, and a discharge member, wherein the container body comprises an inner bag and an outer shell arranged to cover the inner bag, the discharge member has a discharge port for discharging the contents in the inner bag, and the adapter is configured to be engageable with both the container body and the discharge member. [2] A double container as described in [1], wherein the discharge member is a cap having a cap body and an overcap, the cap body is configured to be engageable with the adapter and has the discharge outlet, and the overcap is configured to be able to open and close the discharge outlet. [3] The double container according to [1] or [2], wherein the inner bag has a protrusion protruding from the open end of the outer shell, and the adapter is attached to the protrusion. [4] The double container according to [3], wherein the adapter engages with the protrusion in the axial and circumferential directions. [5] A double container as described in [3], wherein the container body is configured such that, when viewed from above the double container, when the inner bag is rotated in one direction relative to the outer shell, the inner bag is displaced in a direction that causes it to slip out of the container body, and the adapter and the protrusion are screwed together such that rotation of the adapter in one direction relative to the protrusion is the tightening direction of the screwing. [6] The double container according to any one of [1] to [5], wherein a grip portion having a non-slip shape is provided on the outer circumferential surface of the adapter. Effect of the Invention

[0007] In the double container of the present invention, the discharge member is attached to the container body via an adapter that can be engaged with both the container body and the discharge member, which increases the freedom of selection of the discharge member to be attached to the double container. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view of a double container 1 according to a first embodiment of the present invention. The dashed and dotted lines in the figure indicate the boundary line where the curvature of the faces constituting the surface shape changes. The same is true for the other figures. [Diagram 2] FIG. 2 is an exploded perspective view of the double container 1 of FIG. [Diagram 3] FIG. 2 is a vertical cross-sectional view of the double container 1 of FIG. [Figure 4] This is an exploded view of Fig. 3. However, the overcap 42 has been displaced so that the discharge port 12a is in an open state. [Diagram 5] FIG. 3 is an exploded perspective view of the vicinity of the mouth portion 5 in FIG. 2. [Figure 6] Fig. 6A is a perspective view of the adapter 11 in Fig. 2, seen from a different angle. Fig. 6B is a cross-sectional perspective view of the adapter 11 in Fig. 6A cut in half with the inner cylinder 11b partially removed. [Figure 7] FIG. 2 is a perspective view showing a state in which the inner preform 14 and the outer preform 13 are separated. [Figure 8] 1 is a perspective view of a preform 15 formed by covering an inner preform 14 with an outer preform 13. FIG. [Figure 9] FIG. 2 is a perspective view of a double container 1 according to a second embodiment of the present invention. [Figure 10] FIG. 10 is a perspective view of the container body 2 in FIG. [Figure 11] Fig. 11A is a perspective view of the adapter 11 in Fig. 10 from a different angle. Fig. 11B is a cross-sectional view of the adapter 11 in Fig. 11A cut in half. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The following describes the embodiments of the present invention. The various features shown in the following embodiments can be combined with each other. Each feature can be an invention independently. In the following embodiments, elements that are not specified in the claims are optional elements and can be omitted. In the following description, terms related to directions such as "upper" and "lower" refer to the directions when the bottom 7 is in contact with the ground.

[0010] 1. First embodiment The double container according to the first embodiment of the present invention will be described with reference to Figs. 1 to 8.

[0011] 1-1. Structure of double container 1 <Overall composition> As shown in Figs. 1 and 2, the double container 1 of the first embodiment of the present invention comprises a container body 2, an adapter 11, and a discharge member 12. As shown in Figs. 3 and 4, the container body 2 comprises an inner bag 4 and an outer shell 3 arranged to cover the inner bag 4. The discharge member 12 has a discharge port 12a for discharging the contents in the inner bag 4. The adapter 11 is configured to be able to engage with both the container body 2 and the discharge member 12. Each component will be described in detail below.

[0012] <Basic configuration of container body 2> As shown in FIG. 2, the container body 2 has a mouth portion 5, a body portion 6, and a bottom portion 7. The mouth portion 5 is a tubular (preferably cylindrical) portion having an open end 5c. The open end 5c is the open end of the container body 2 and also the open end of the inner bag 4. The mouth portion 5 has an engagement portion 4m with which the adaptor 11 can be engaged. The mouth portion 5 is provided with a flange 5b. The flange 5b can be used to support the mouth portion 5 when the adaptor 11 is attached to the mouth portion 5.

[0013] The body 6 is disposed adjacent to the mouth 5 on the side farther from the open end 5c than the mouth 5. The body 6 has a larger outer diameter (in this specification, "outer diameter" means a circular equivalent diameter when the cross section is not circular) than the mouth 5. The body 6 is cylindrical, and the bottom 7 is provided at the lower end of the body 6 and closes the lower end of the body 6. The body 6 has a shoulder 6b whose outer diameter increases with increasing distance from the mouth 5. The body 6 also has a body main body 6c on the bottom 7 side of the shoulder 6b. The body main body 6c has a shape in which the outer diameter is approximately constant toward the bottom 7, or a shape in which the diameter decreases toward the bottom 7, for example.

[0014] 3 to 5, the container body 2 includes an inner bag 4 and an outer shell 3 arranged to cover the inner bag 4. The inner bag 4 has an inner bag body 4d other than the protruding portion 4c housed within the outer shell 3. In the following description, the portions of the inner bag 4 that correspond to the mouth 5, body 6, and bottom 7 of the container body 2 will be referred to as the mouth 5, body 6, and bottom 7 of the inner bag 4, respectively. The same applies to the outer shell 3.

[0015] <Detailed structure of outer shell 3 and inner bag 4> 2 to 5, the inner bag 4 has a protruding portion 4c protruding from the open end 3a of the outer shell 3. As shown in Fig. 5, the protruding portion 4c has a protruding tube 4c1, an engaging protruding portion 4c2, an annular protruding portion 4c5, and a contacting protruding portion 4v.

[0016] The annular protrusion 4c5 engages with the adaptor 11 in the axial direction. The engagement protrusion 4c2 engages with the adaptor 11 in the circumferential direction. The engagement protrusion 4c2 and the annular protrusion 4c5 form an engagement portion 4m. As shown in FIG. 3, a recess 4c13 is provided on the inner peripheral surface of the engagement portion 4m. The engagement portion 4m is disposed at a position closer to the open end 5c of the inner bag 4 than the abutment protrusion 4v. In this specification, the "axial direction" refers to the direction in which the central axis C of the mouth portion 5 extends, in other words, the direction in which the inner bag 4 is pulled out from the container body 2. The "circumferential direction" refers to the direction in which the mouth portion 5 rotates around the central axis C of the mouth portion 5, in other words, the direction in which the inner bag 4 is rotated relative to the outer shell 3 at the mouth portion 5.

[0017] The engaging protrusions 4c2 are preferably provided at a plurality of locations (eight locations in this embodiment) spaced apart in the circumferential direction. The engaging protrusions 4c2 are disposed on the annular protrusion 4c5 and provided so as to protrude radially outward from the annular protrusion 4c5. The annular protrusion 4c5 and the engaging protrusions 4c2 have tapered surfaces 4c8 on their upper surfaces. This makes it easier for the annular protrusion 11e1 (shown in FIG. 6) provided on the adapter 11 to climb over the annular protrusion 4c5 and the engaging protrusions 4c2 when the adapter 11 is attached.

[0018] The contact protrusion 4v is disposed at a position where it contacts the open end 3a and is a portion that protrudes radially outward from the protruding tube 4c1. The contact protrusion 4v contacts the open end 3a, thereby preventing the inner bag 4 from falling off into the outer shell 3. The contact protrusion 4v is composed of one or more protrusions.

[0019] The container body 2 is preferably a molded body produced by biaxially stretching and blow molding a preform 15 (shown in Figs. 7 and 8) formed by covering an outer preform 13 with an inner preform 14 formed by direct blow molding. When the inner preform 14 is formed by direct blow molding, the shape precision of the protruding portion 4c may be lower than when the inner preform 14 is formed by injection molding, and in that case, the shape of the protruding portion 4c may not match the standard discharge member 12. On the other hand, in this embodiment, the discharge member 12 is attached to the mouth portion 5 of the container body 2 via the adapter 11, and by forming the adapter 11 by injection molding, it is possible to suppress the occurrence of a problem that the shape of the adapter 11 does not match the standard discharge member 12.

[0020] 5, a ridge 4g is provided on the outer circumferential surface of the inner bag 4 (more specifically, the inner bag body 4d). The lower surface of the ridge 4g is inclined so as to approach the open end 5c as it progresses counterclockwise when viewed from above the double container 1.

[0021] As shown in FIG. 5, the inner peripheral surface of the outer shell 3 is provided with a cam rail 3l and a groove 3m. The groove 3m is provided so that the lower surface of the groove 3m is continuous with the upper surface of the cam rail 3l. The upper surface of the cam rail 3l is inclined so as to approach the opening end 3a as it proceeds counterclockwise when viewed from the top of the double container 1. The protrusion 4g and the groove 3m are configured to be engageable by relative rotation of the inner bag 4 and the outer shell 3 in one direction, and to be disengaged by relative rotation of the inner bag 4 and the outer shell 3 in the other direction. In this embodiment, when viewed from the top of the double container 1, the protrusion 4g can be inserted into the groove 3m to be engaged by rotating the inner bag 4 clockwise with respect to the outer shell 3, and the protrusion 4g can be disengaged from the groove 3m by rotating the inner bag 4 counterclockwise with respect to the outer shell 3.

[0022] Before the inner bag 4 is pulled out of the container body 2, the lower surface of the ridge 4g abuts against the upper surface of the cam rail 3l. The ridge 4g and the cam rail 3l form a cam mechanism 31. When the inner bag 4 is rotated counterclockwise, the cam mechanism 31 causes the inner bag 4 to be displaced in a direction that causes it to come out of the container body 2. At this time, the inner bag 4 is twisted and reduced in diameter. The cam mechanism 31 has an inclined structure in the same direction as a positive screw.

[0023] <Adapter 11 configuration> The adapter 11 is provided to enable the discharge member 12 to be attached to the container body 2. As shown in Figures 4 and 6, the adapter 11 is provided with an engagement portion 11e that engages with the engagement portion 4m of the container body 2, and an engagement portion 11g that engages with the engagement portion 12e of the discharge member 12. This makes it possible to attach the discharge member 12 to the container body 2 via the adapter 11, increasing the freedom of selection of the discharge member 12. The adapter 11 is preferably attached to the protruding portion 4c of the inner bag 4.

[0024] As shown in FIG. 6, the adapter 11 is a cylindrical member and includes an outer cylinder 11a, an inner cylinder 11b, an upper cylinder 11c, an upper wall 11d, and an intermediate cylinder 11j. The inner cylinder 11b is disposed inside the outer cylinder 11a. The intermediate cylinder 11j is disposed between the outer cylinder 11a and the inner cylinder 11b. The outer cylinder 11a, the inner cylinder 11b, and the intermediate cylinder 11j are connected via the upper wall 11d. The upper cylinder 11c is disposed above the upper wall 11d. A flow hole 11i is provided in the upper wall 11d, and the flow passages of the inner cylinder 11b and the upper cylinder 11c are connected through the flow hole 11i. It is preferable that the outer diameter of the upper cylinder 11c is smaller than the outer diameter of the outer cylinder 11a. In the double container 1, which is intended to have the inner bag 4 pulled out, the outer diameter of the mouth 5 is likely to be larger than that of general containers such as PET bottles, but by making the outer diameter of the upper tube 11c smaller than the outer diameter of the outer tube 11a, it becomes easier to use a standard discharge member 12 used for general containers.

[0025] As shown in FIG. 3, the inner tube 11b is inserted into the inner bag 4 and is in close contact with the inner surface of the inner bag 4. The open end 5c of the inner bag 4 is inserted into the space between the inner tube 11b and the intermediate tube 11j. In order to improve the close contact between the inner bag 4 and the inner tube 11b, it is preferable that the inner diameter of the inner bag 4 at the portion 4w where the inner tube 11b abuts is slightly smaller than the outer diameter of the inner tube 11b. In this case, when the inner tube 11b is inserted into the inner bag 4, the inner bag 4 is pressed radially outward by the inner tube 11b and expanded in diameter. The intermediate tube 11j is disposed at a position adjacent to the open end 5c so that it can abut against the outer peripheral surface of the inner bag 4. By providing the intermediate tube 11j, the radial outward displacement of the inner bag 4 at the position adjacent to the open end 5c is restricted. This makes it difficult for the inner bag 4 to spread radially outward, which makes it easier to improve the close contact between the inner bag 4 and the inner tube 11b. It is preferable that the length of protrusion of the intermediate tube 11j from the upper wall 11d be shorter than the length of protrusion of the inner tube 11b from the upper wall 11d, in which case the open end 5c can be easily inserted into the space between the inner tube 11b and the intermediate tube 11j.

[0026] The inner peripheral surface of the outer tube 11a is provided with an engagement portion 11e that engages with the engagement portion 4m. As shown in FIG. 6, the engagement portion 11e includes an annular protrusion 11e1 and an engagement protrusion 11e2 disposed adjacent to the upper side of the annular protrusion 11e1. The annular protrusion 11e1 engages with the annular protrusion 4c5 (shown in FIG. 5) of the inner bag 4, so that the adapter 11 engages with the inner bag 4 in the axial direction, and the adapter 11 can be gripped and the inner bag 4 can be pulled out from the container body 2. The engagement protrusions 11e2 are preferably provided at a plurality of locations (eight locations in this embodiment) spaced apart in the circumferential direction. The engagement protrusions 11e2 engage with the engagement protrusions 4c2 (shown in FIG. 5) of the inner bag 4, so that the adapter 11 engages with the inner bag 4 in the circumferential direction, and the adapter 11 can be gripped and the inner bag 4 can be rotated relative to the outer shell 3. The outer peripheral surface of the outer tube 11a is provided with a gripping portion 11f having a non-slip shape. In this embodiment, the anti-slip shape is an uneven shape (e.g., knurled shape) in which convex parts and concave parts are alternately arranged in the circumferential direction. In another embodiment, the anti-slip shape may be, for example, a shape in which the outer circumferential surface of the grip part 11f is roughened.

[0027] As shown in Figs. 3 to 4 and 6, an engagement portion 11g that can engage with the engagement portion 12e of the discharge member 12 is provided on the outer circumferential surface of the upper tube 11c. A flange 11h is provided below the engagement portion 11g. The flange 11h can be used to support the upper tube 11c when the discharge member 12 is attached to the upper tube 11c. The shape of the engagement portion 11g can be such that it can appropriately engage with the discharge member 12 that is intended to be attached. In this embodiment, the discharge member 12 is of a stopper type, and an annular protrusion is provided as the engagement portion 11g. If the discharge member 12 is of a screw type, a male screw portion can be provided as the engagement portion 11g.

[0028] <Dimensions of inner bag 4 and adapter 11> In this embodiment, the inner bag 4 and the adapter 11 have different dimensions of the portions where other members are engaged, as follows: In addition, the adapter 11 has a dimension of the portion where the discharge member 12 is engaged that complies with the F-port standard.

[0029] Dimension A from the opening end 5c of the inner bag 4 to the bottom end of the engagement part 4m: 8.9 mm Inner diameter B at part 4w: 27.5mm Outer diameter C at engagement portion 4m (more specifically, engagement protrusion 4c2): 33 mm Outer diameter D of the protruding tube 4c1 (in other words, the portion below the engaging portion 4m, the portion between the engaging portion 4m and the contact protrusion): 29.8 mm Dimension E from the open end 11l of the adapter 11 to the bottom end of the engagement portion 11g: 4.5 mm Inner diameter F of the adapter 11 at a portion 11k (shown in FIG. 3) where the inner cylinder 42b abuts: 27.6 mm Outer diameter G at engagement part 11g: 32mm Outer diameter H of the upper cylinder 11c (in other words, the portion below the engaging portion 11g, the portion between the engaging portion 11g and the flange 11h): 30 mm

[0030] <Configuration of Discharge Member 12> As shown in FIG. 4, the discharge member 12 is a member having a discharge port 12a for discharging the contents in the inner bag 4, and preferably includes a nozzle 12b. In this embodiment, the discharge member 12 is a cap 12c, but may also be a pump. The discharge member 12 is attached to the adapter 11. The discharge member 12 includes an engagement portion 12e that engages with an engagement portion 11g of the adapter 11. The discharge member 12 is preferably a standard product having an engagement structure defined by a standard such as the F-port standard. Various types of discharge members 12, which are standard products, are commercially available and have excellent availability.

[0031] The cap 12c preferably includes a cap body 41 and an overcap 42. The cap body 41 is configured to be able to engage with the adapter 11, and includes the outlet 12a. The overcap 42 is configured to be able to open and close the outlet 12a. FIG. 3 shows a closed state in which the outlet 12a is closed, and FIG. 4 shows an open state in which the outlet 12a is open. In this embodiment, the cap body 41 and the overcap 42 are connected by a hinge 43, but they do not have to be connected. The overcap 42 is preferably able to engage with the cap body 41 by a screw or a snap fit.

[0032] The cap body 41 includes an outer cylinder 41a, an inner cylinder 41b, a nozzle 12b, and an upper wall 41d. The inner cylinder 41b is disposed inside the outer cylinder 41a. The outer cylinder 41a and the inner cylinder 41b are connected via the upper wall 41d. The nozzle 12b is disposed above the upper wall 41d. A flow hole 41i is provided in the upper wall 41d, and the flow passage of the inner cylinder 41b and the nozzle 12b are connected through the flow hole 41i. The tip of the nozzle 12b becomes the discharge port 12a.

[0033] The inner cylinder 41b is inserted into the adapter 11 and is in close contact with the inner surface of the adapter 11. An engagement portion 12e that engages with the engagement portion 11g of the adapter 11 is provided on the inner peripheral surface of the outer cylinder 41a. In this embodiment, the engagement portion 12e is configured as an annular convex portion. The engagement of the engagement portion 12e with the engagement portion 11g engages the discharge member 12 with the adapter 11. If the discharge member 12 is screw-type, the engagement portion 12e is configured as a female screw portion.

[0034] The overcap 42 includes an outer tube 42a, an inner tube 42b, a hook portion 42c, and an upper wall 42d. The inner tube 42b is disposed inside the outer tube 42a. The outer tube 42a and the inner tube 42b are connected via the upper wall 42d. The hook portion 42c is provided so as to protrude from the outer peripheral surface of the outer tube 42a. The upper wall 42d is not provided with a discharge port for discharging the contents in the inner bag 4.

[0035] When the discharge port 12a is closed by the overcap 42, the inner tube 42b is inserted into the nozzle 12b of the cap body 41 and is in close contact with the inner surface of the nozzle 12b. The bottom surface of the outer tube 42a abuts against the upper wall 41d of the cap body 41. From this state, by hooking a finger or the like on the hook portion 42c and applying an upward force to the overcap 42, the overcap 42 can be separated from the cap body 41 to open the discharge port 12a.

[0036] <Removing inner bag 4> The adapter 11 is engaged with the mouth portion 5 of the inner bag 4 in the circumferential and axial directions, and is configured so that the inner bag 4 rotates relative to the outer shell 3 as the adapter 11 rotates. The inner bag 4 is configured to move in a direction to come out of the container body 2 as the inner bag 4 rotates due to the action of a cam mechanism 31 provided between the inner bag 4 and the outer shell 3.

[0037] According to this configuration, by rotating the adapter 11, the inner bag 4 can be displaced in a direction that causes it to twist and come out of the container body 2, and then, by pulling the adapter 11, the inner bag 4 can be pulled out of the container body 2.

[0038] 1-2. Manufacturing method of double container 1 The container body 2 can be manufactured by biaxially stretching and blow molding a preform 15 shown in Fig. 8. In addition, the double container 1 can be manufactured by attaching an adapter 11 and a discharge member 12 to the container body 2.

[0039] <Configuration of inner preform 14, outer preform 13, and preform 15> As shown in FIG. 7, the preform 15 includes an inner preform 14 which becomes the inner bag 4 and an outer preform 13 which becomes the outer shell 3 .

[0040] As shown in Fig. 7, the inner preform 14 is cylindrical with a bottom, and includes a mouth portion 14a, a body portion 14b, and a bottom portion 14c. The bottom portion 14c is provided so as to close the lower end of the body portion 14b. The outer preform 13 is cylindrical with a bottom, and includes a mouth portion 13a, a body portion 13b, and a bottom portion 13c. The bottom portion 13c is provided so as to close the lower end of the body portion 13b.

[0041] 8, the preform 15 can be formed by covering the inner preform 14 with the outer preform 13. In the preform 15, the mouth portion 14a faces the mouth portion 13a, and the body portion 14b faces the body portion 13b.

[0042] The mouth portions 13a and 14a become the mouth portion 15a of the preform 15, the body portions 13b and 14b become the body portion 15b of the preform 15, and the bottom portions 13c and 14c become the bottom portion 15c of the preform 15. The body portion 15b and the bottom portion 15c are mainly stretched in the biaxial stretch blow molding. The mouth portion 15a is hardly deformed during molding and becomes the mouth portion 5 of the container body 2. The above-mentioned contents regarding the configuration included in the mouth portion 5 can also be applied to the configuration included in the mouth portion 15a as long as it is not contrary to the spirit thereof.

[0043] <Materials and manufacturing methods of inner preform 14, outer preform 13, and preform 15> The inner preform 14 and the outer preform 13 can be formed by direct blow molding or injection molding using a thermoplastic resin such as polyester (eg, PET) or polyolefin (eg, polypropylene, polyethylene).

[0044] The outer preform 13 is preferably formed by injection molding. The inner preform 14 is preferably formed by direct blow molding using a molten cylindrical parison. By forming the inner preform 14 by direct blow molding, a recess 4c13 is formed on the inner peripheral surface of the engagement portion 4m. The inner preform 14 is preferably of a multi-layer structure.

[0045] 2. Second embodiment A second embodiment of the present invention will be described with reference to Figures 9 to 11. This embodiment is similar to the first embodiment, and the contents described in the first embodiment can also be applied to this embodiment as long as they are not contrary to the spirit of the first embodiment. This embodiment differs from the first embodiment mainly in the engagement structure between the adapter 11 and the container body 2. The following description will focus on the differences.

[0046] In this embodiment, the container body 2 is configured so that, when viewed from above the double container 1, when the inner bag 4 is rotated in one direction relative to the outer shell 3, the inner bag 4 is displaced in a direction in which it escapes from the container body 2, and the adapter 11 and the protrusion 4c are screwed together so that the relative rotation of the adapter 11 in one direction relative to the protrusion 4c is the tightening direction of the screwing.

[0047] In this embodiment, the one direction is the counterclockwise direction, and the adapter 11 and the protruding portion 4c are configured to be screwable with a reverse thread. That is, the engagement portion 4m of the protruding portion 4c is a reverse-threaded male screw portion 4m1, and the engagement portion 11e of the adapter 11 is a reverse-threaded female screw portion 11e3. With this configuration, the adapter 11 can be attached to the container body 2 by rotating the adapter 11 counterclockwise relative to the container body 2 when viewed from the top of the double container 1. When attaching the adapter 11 to the protruding portion 4c, a rotation restriction structure is provided to restrict the relative rotation between the inner bag 4 and the outer shell 3 in order to prevent the inner bag 4 from slipping out of the container body 2, and it is preferable that the tightening torque when attaching the adapter 11 to the protruding portion 4c is set to less than a threshold torque required to rotate the inner bag 4 relative to the outer shell 3. Examples of the rotation restriction structure include a structure that increases the frictional force between the inner bag 4 and the outer shell 3 (for example, a structure in which the width of the convex rib 4g is made larger than the width of the concave rib 3m to cause strong interference) and a structure in which the inner bag 4 and the outer shell 3 are engaged with each other in a concave-convex manner in the circumferential direction. The adapter 11 may be attached to the protruding portion 4c by a plugging method. In this case, when a downward force is applied to the adapter 11 with the adapter 11 placed over the protruding portion 4c, the helical protrusion constituting the female screw portion 11e3 overcomes the helical protrusion constituting the male screw portion 4m1, and the female screw portion 11e3 and the male screw portion 4m1 can be engaged with each other. In this case, it is preferable that at least one of the female screw portion 11e3 and the male screw portion 4m1 is an intermittent screw portion formed intermittently in the circumferential direction. According to such a configuration, in addition to reducing the force required to engage the female thread portion 11e3 and the male thread portion 4m1, when the female thread portion 11e3 rides up onto the male thread portion 4m1, the female thread portion 11e3 and the male thread portion 4m1 can be easily brought into an engaged state by rotating the adapter 11 relative to the protruding portion 4c. When the adapter 11 is attached to the protruding portion 4c in a plugging manner, no circumferential force is applied to the inner bag 4, and therefore the above-mentioned rotation restriction structure is not essential.

[0048] Furthermore, when the inner bag 4 is pulled out from the container body 2, the inner bag 4 is rotated counterclockwise relative to the outer shell 3 when viewed from above the double container 1, but this rotation direction is the reverse screw tightening direction, so the adapter 11 does not come off from the inner bag 4 during this rotation. After the inner bag 4 is pulled out from the container body 2, the adapter 11 can be separated from the inner bag 4 by rotating the adapter 11 relative to the inner bag 4 in the reverse screw loosening direction.

[0049] This allows the adapter 11 and the discharge member 12 to be treated separately from the inner bag 4, improving recyclability.

[0050] The direction in which each member is rotated relative to the above embodiment may be reversed. In the above embodiment, the inner bag 4 is displaced in a direction to come out of the container body 2 by rotating the positive screw in the loosening direction, and the adapter 11 is screwed to the protruding portion 4c by rotating the negative screw in the tightening direction, but the inner bag 4 may be displaced in a direction to come out of the container body 2 by rotating the positive screw in the loosening direction, and the adapter 11 may be screwed to the protruding portion 4c by rotating the positive screw in the tightening direction. In this case, the "one direction" referred to in the above embodiment is the clockwise direction. [Explanation of symbols]

[0051] 1:Double container 2: Container body 3: Outer shell 3a: Open end 3l: Cam rail 3m: Concave 4: Inner bag 4c:Protrusion 4c1:Protruding tube 4c2: Engagement convex part 4c5: Circular convex part 4c8: Tapered surface 4c13: Recess 4d: Inner bag body 4g: Convex stripe 4m: Engagement part 4m1: Male thread 4v: Contact convex part 4w: part 5: Mouth 5b: Flange 5c: Open end 6: Torso 6b:Shoulder 6c: Main body 7: Bottom 11: Adapter 11a: Outer cylinder 11b: Inner cylinder 11c: Upper cylinder 11d: Upper wall 11e: Engagement part 11e1: Annular protrusion 11e2: Engagement convex part 11e3: Female thread 11f: Grip part 11g: Engagement part 11h: Flange 11i :Flow hole 11j: Intermediate cylinder 11k: part 11l: Open end 12: Discharge member 12a:Discharge port 12b: Nozzle 12c: Cap 12e: Engagement part 13: Outer preform 13a: Mouth 13b: Torso 13c: Bottom 14: Inner preform 14a: Mouth 14b: Torso 14c: Bottom 15: Preform 15a: Mouth 15b: Torso 15c: bottom 31: Cam mechanism 41: Cap body 41a: Outer cylinder 41b: Inner cylinder 41d: Upper wall 41i :Flow hole 42: Overcap 42a: Outer cylinder 42b: Inner cylinder 42c: Hook 42d: Upper wall 43: Hinge C: Central axis

Claims

1. A double container comprising a container body, an adapter, and a discharge member, The container body includes an inner bag and an outer shell arranged to cover the inner bag. the discharge member has a discharge port for discharging the contents in the inner bag, The adapter is configured to be engageable with both the container body and the discharge member.

2. The double container according to claim 1, The discharge member is a cap including a cap body and an overcap, the cap body is configured to be engageable with the adapter and includes the discharge port; The overcap is configured to be able to open and close the discharge port, the double container.

3. The double container according to claim 1, The inner bag has a protrusion protruding from an open end of the outer shell, The adapter is attached to the protrusion, the dual vessel.

4. The double container according to claim 3, The adapter engages the protrusion axially and circumferentially.

5. The double container according to claim 3, The container body is configured such that, when viewed from above the double container, the inner bag is displaced in a direction to come out of the container body when the inner bag is rotated in one direction relative to the outer shell, The adapter and the protrusion are screwed together such that rotation of the adapter relative to the protrusion in the one direction is a tightening direction of the screwing.

6. The double container according to any one of claims 1 to 5, The double container has a grip portion having a non-slip shape on the outer circumferential surface of the adapter.

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