Double container and method for producing the same

Abstract

To provide a double container in which an inner bag can be easily removed from a container body, and a closed space can be easily formed between an outer shell and the inner bag.SOLUTION: According to the present invention, a double container comprises a container body and a mouth attachment member attached to a mouth of the container body. The container body comprises an inner bag and an outer shell arranged so as to cover the inner bag, and the inner bag comprises a protruding part protruding from an opening end of the outer shell. Provided that a direction in which the central axis of the mouth of the container body extends is defined as an axial direction, the mouth attachment member comprises a body member, and the body member is engaged with the protruding part in the axial direction. The body member comprises a discharge port in communication with the inside of the inner bag or an insertion hole into which the protruding part is inserted, and the body member and the outer shell are mutually adhered directly or via an another member in an adhesion face. The double container according to the present invention has excellent recyclability, thus is suitably utilizable for the production of a recycled material.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Patent Document 1 discloses a double container having a container body with an outer shell and an inner bag. This double container is configured so that the inner bag can be pulled out from the container body by grasping a mouth attachment member that engages with the inner bag. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2024-18821 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in the double container of Patent Document 1, the mouth attachment member is engaged only with the inner bag, which has the advantage that the inner bag can be pulled out simply by pulling the mouth attachment member. However, there is a problem in that a gap is likely to form between the inner bag and the outer shell at the mouth of the container body, making it difficult to use in applications where it is necessary to form an airtight space between the outer shell and the inner bag.

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide a double container in which the inner bag can be easily pulled out from the container body and an airtight space can be easily formed between the outer shell and the inner bag. [Means for solving the problem]

[0006] According to the present invention, the following inventions are provided. [1] A double container comprising a container body and a mouth attachment member attached to the mouth of the container body, wherein the container body comprises an inner bag and an outer shell arranged to cover the inner bag, the inner bag having a protrusion protruding from the open end of the outer shell, and when the direction in which the central axis of the mouth of the container body extends is taken as the axial direction, the mouth attachment member comprises a main body member, which is engaged with the protrusion in the axial direction, and which has a discharge port communicating with the interior of the inner bag or an insertion hole through which the protrusion is inserted, and the main body member and the outer shell are in close contact with each other at their contact surfaces, either directly or via another member. [2] A double container as described in [1], wherein the main body member has a main body member sealing tube, and the main body member sealing tube and the outer shell are in close contact with each other at the contact surface, either directly or via another member. [3] The double container according to [2], wherein the contact surface is inclined with respect to the axial direction. [4] A double container as described in [2] or [3], wherein the main body member has an engaging tube, the engaging tube has an engaging protrusion that engages with the protrusion in the axial direction, and the engaging tube and the main body member sealing tube are connected to each other at a position farther from the tip of the engaging tube than the engaging protrusion. [5] A double container according to any one of [2] to [4], wherein the main body member sealing tube is not engaged with the outer shell by projections and recesses. [6] A double container according to any one of [2] to [5], wherein the outer shell comprises an outer shell sealing tube, and the contact surface is disposed on the outer shell sealing tube. [7] A double container according to [6], wherein the contact surface is a surface where the outer peripheral surface of the main body member sealing tube and the inner peripheral surface of the outer shell sealing tube are in close contact with each other. [8] A double container according to any one of [2] to [7], wherein the main body member has an inner tube having an outer diameter smaller than that of the main body member sealing tube, and the inner surface of the inner tube is in close contact with the outer surface of the protrusion. [9] A double container according to [8], wherein the contact surface between the inner peripheral surface of the inner cylinder and the outer peripheral surface of the protrusion is inclined with respect to the axial direction.

[10] A double container as described in any one of [2] to [9], wherein the main body member has an insertion hole through which the protrusion is inserted, the mouth attachment member has a discharge member having a discharge port that communicates with the inside of the inner bag, and the discharge member is attached to the tip of the protrusion that protrudes from the main body member through the insertion hole.

[11] A double container according to [2], wherein the contact surface is a surface where the outer peripheral surface of the main body member sealing tube and the inner peripheral surface of the outer shell are in close contact with each other.

[12] The double container according to [2], wherein the sealing surface is provided at the tip of the main body member sealing tube.

[13] A double container according to

[11] or

[12] , wherein the main body member sealing tube has a soft part made of elastomer integrally molded therein so as to include the contact surface.

[14] A double container according to [1], wherein the other member is a soft member made of an elastomer, and the soft member is disposed between the open end of the outer shell and the main body member.

[15] The double container according to

[12] or

[14] , wherein the main body member and the outer shell are screwed together.

[16] The double container according to [2], wherein the sealing surface is provided in a region adjacent to the open end of the outer shell.

[17] A double container according to

[16] , wherein the main body member sealing tube engages with the outer shell at a position farther from the open end of the outer shell than the contact surface.

[18]

[16] A double container according to the invention, wherein the sealing surface is in tight contact with the area adjacent to the tip of the main body member sealing tube and the area adjacent to the open end of the outer shell.

[19] A double container according to any one of

[16] to

[18] , wherein at least one of the outer shell and the main body member sealing tube has a plurality of annular protrusions arranged along the axial direction at the contact surface.

[20] A method for producing a double container according to any one of [1] to

[19] , wherein the container body of the double container is produced by biaxially stretched blow molding. [Effects of the Invention]

[0007] In the present invention, the main body member of the spout-attaching member engages with the inner bag in the axial direction, making it easy to pull out the inner bag from the container body. Also, the main body member and the outer shell are in close contact with each other at their contact surfaces, making it easy to form a sealed space between the outer shell and the inner bag. [Brief explanation 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-dotted line in the figure indicates the boundary line where the curvature of the faces that make up the surface shape changes. The same applies to the other figures. [Figure 2] FIG. 2 is an exploded perspective view of the double container 1 of FIG. [Figure 3] 2 is a cross-sectional view of the vicinity of the mouth 5 of the double container 1 of FIG. [Figure 4] FIG. 4 is an exploded view of FIG. 3. [Figure 5] FIG. 5 is an exploded view of the container body 2 of FIG. [Figure 6] FIG. 2 is a perspective view showing a state in which the inner preform 14 and the outer preform 13 are separated. [Figure 7] FIG. 1 is a perspective view of a preform 15 formed by covering an outer preform 13 on an inner preform 14. [Figure 8] FIG. 4 is a cross-sectional view corresponding to FIG. 3 of a double container 1 according to a second embodiment of the present invention. [Figure 9] FIG. 9 is an exploded view of FIG. 8. [Figure 10] FIG. 4 is a cross-sectional view corresponding to FIG. 3 of a double container 1 according to a third embodiment of the present invention. [Figure 11] This shows a state in which the discharge member 43 has been separated from the state shown in FIG. [Figure 12] 11. The figure shows a state in which the main body member 41 and the seal member 44 have been separated from the state shown in FIG. [Figure 13] FIG. 10 is a cross-sectional view corresponding to FIG. 3 of a double container 1 according to a fourth embodiment of the present invention. [Figure 14] This shows a state in which the discharge member 43 has been separated from the state shown in FIG. [Figure 15] This shows a state in which the main body member 41 and the seal member 44 have been separated from the state shown in FIG. [Figure 16] FIG. 10 is a cross-sectional view corresponding to FIG. 3 of a double container 1 according to a fifth embodiment of the present invention. [Figure 17] FIG. 17 is an exploded view of FIG. [Figure 18] FIG. 10 is a cross-sectional view corresponding to FIG. 3 of a double container 1 according to a sixth embodiment of the present invention. [Figure 19] FIG. 19 is an exploded view of FIG. [Figure 20] 10 is a cross-sectional view corresponding to FIG. 3 of a double container 1 according to a first modified example of the sixth embodiment of the present invention. FIG. [Figure 21] FIG. 21 is an exploded view of FIG. 20. [Figure 22] 10 is a cross-sectional view corresponding to FIG. 3 of a double container 1 according to a second modified example of the sixth embodiment of the present invention. FIG. [Figure 23] FIG. 23 is an exploded view of FIG. 22. [Figure 24] FIG. 10 is a cross-sectional view corresponding to FIG. 3 of a double container 1 according to a seventh embodiment of the present invention. [Figure 25] FIG. 25 is an exploded view of FIG. 24. [Figure 26] 10 is a cross-sectional view corresponding to FIG. 3 of a double container 1 according to an eighth embodiment of the present invention. [Figure 27] FIG. 27 is an exploded view of FIG. 26. [Figure 28] FIG. 10 is a cross-sectional view corresponding to FIG. 3 of a double container 1 according to a ninth embodiment of the present invention. [Figure 29] FIG. 29 is an exploded view of FIG. 28. [Figure 30] 30A and 30B are enlarged views of areas A and B in FIG. 29, respectively. DETAILED DESCRIPTION OF THE INVENTION

[0009] The following describes 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 not specified in the claims are optional and can be omitted. Any number of "0"s (for example, one or two) may be added to the end of numerical values ​​disclosed in the following description. For example, one or two "0"s may be added after "1.4" to make it "1.40" or "1.400."

[0010] 1. First embodiment The double container 1 of the first embodiment of the present invention will be described using Figures 1 to 7. In the following description, terms related to directions, such as "upper" and "lower," refer to directions when the bottom 7 is in contact with the ground. In addition, in the following description, the "axial direction" refers to the direction in which the central axis C (shown in Figure 2) of the mouth 5 extends, and is, for example, the direction in which the inner bag 4 is pulled out from the container body 2. The "circumferential direction" refers to the rotation direction around the central axis C of the mouth 5, and is, for example, the direction in which the inner bag 4 is rotated at the mouth 5 relative to the outer shell 3. Unless otherwise specified, "clockwise" and "counterclockwise" refer to directions as viewed from the top of the double container 1.

[0011] 1-1. Structure of double container 1 As shown in Fig. 1, the double container 1 of the first embodiment of the present invention comprises a container body 2 and a spout attachment member 8. Each component will be described in detail below.

[0012] <Basic configuration of container body 2> 2, the container body 2 has a mouth 5, a body 6, and a bottom 7. The mouth 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.

[0013] The body 6 is disposed adjacent to the mouth 5 on a 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 the equivalent circular 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] As shown in Figures 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 configuration of outer shell 3 and inner bag 4> As shown in Figures 3 to 5, the inner bag 4 has a protruding portion 4c that protrudes from the open end 3a of the outer shell 3. As shown in Figure 4, the protruding portion 4c of the inner bag 4 has, in order from the open end 3a side, an expanded diameter portion 4c1, a reduced diameter portion 4c2, and an engaging portion 4c3. The reduced diameter portion 4c2 has a smaller inner diameter than the expanded diameter portion 4c1 and the engaging portion 4c3. The outer shell 3 has, in order from the open end 3a side, first and second flange portions 3f1 and 3f2. An outer shell seal tube 3g is attached to the first flange portion 3f1.

[0016] As shown in Fig. 5, the inner bag 4 includes a first tube 4a and a second tube 4b. The first tube 4a is disposed within the outer shell 3. The second tube 4b has a larger outer diameter than the first tube 4a and is disposed closer to the open end 5c of the inner bag 4 than the first tube 4a. The entire second tube 4b may be disposed outside the outer shell 3, or part or all of the second tube 4b may be disposed within the outer shell 3, with the remainder disposed outside the outer shell 3.

[0017] A lower surface 4b4 of the second tube 4b abuts against the outer shell 3. The lower surface 4b4 abuts against an inner bag support surface 3a3 provided on the outer shell 3. Support of the lower surface 4b4 by the inner bag support surface 3a3 prevents the inner bag 4 from falling into the outer shell 3. The inner bag support surface 3a3 may be flush with the base surface 3a1 of the opening end 3a, or may be provided at a higher or lower position than the base surface 3a1. In this embodiment, the inner bag support surface 3a3 is provided at a lower position than the base surface 3a1. Therefore, a portion of the second tube 4b is disposed inside the outer shell 3, and the remainder is disposed outside the outer shell 3.

[0018] As shown in Patent Document 1, a cam mechanism is preferably provided between the inner bag 4 and the outer shell 3. The cam mechanism functions to displace the inner bag 4 in a direction that allows it to be removed from the container body 2 by rotating the inner bag 4 clockwise or counterclockwise relative to the outer shell 3. This cam mechanism can be configured, for example, by a ridge 4g provided on the outer peripheral surface of the inner bag 4 and a cam rail 3l provided on the inner peripheral surface of the outer shell 3 (see FIG. 16). When the inner bag 4 is rotated relative to the outer shell 3 at the opening 5, the inner bag 4 is twisted and its diameter is reduced, making it even easier to pull out.

[0019] <Mouth attachment part 8> The mouth attachment member 8 is a member that is attached to the mouth 5 of the container body 2. In this embodiment, the mouth attachment member 8 is a cap 8a, but it may also be another member such as a pump. In this embodiment, the mouth attachment member 8 is configured to be attached to the mouth 5 in a stoppered manner, but it may also be configured to be attached to the mouth 5 in a screwed manner.

[0020] As shown in FIGS. 3 and 4, the opening-attached member 8 includes a main body member 41. The main body member 41 includes a nozzle 41a, an inner tube 41b, an engaging tube 41c, a main body member sealing tube 41d, and an outer tube 41e. The outer diameters of these cylindrical portions increase in this order. Therefore, the inner tube 41b has a smaller outer diameter than the main body member sealing tube 41d. These cylindrical portions are connected to each other by a top surface 41g. The nozzle 41a is provided with a discharge port 41f that communicates with the interior of the inner bag 4, allowing the contents of the inner bag 4 to be discharged through the nozzle 41a and the discharge port 41f. The nozzle 41a is provided with a discharge valve 42. The discharge valve 42 is configured to allow the contents to be discharged while preventing outside air from entering the inner bag 4. The discharge port 41f can be closed with an overcap 46 (shown in FIG. 16), and when in use, the overcap 46 can be removed to open the discharge port 41f and allow the contents to be discharged.

[0021] The inner tube 41b is inserted into the inner bag 4, and the outer peripheral surface of the inner tube 41b comes into close contact with the inner peripheral surface of the reduced diameter portion 4c2. This prevents the contents from leaking through a gap between the main body member 41 and the inner bag 4, and prevents outside air from entering the inner bag 4 through this gap. Note that instead of forming a seal by tightly contacting the inner tube 41b with the inner bag 4, the seal may be formed by another method. For example, the seal may be formed by placing a packing between the opening end 5c and the main body member 41.

[0022] The engagement tube 41c has an engagement protrusion 41c1 on its inner circumferential surface. The engagement protrusion 41c1 is, for example, annular. The engagement protrusion 41c1 axially engages with the protrusion 4c (more specifically, with the engagement portion 4c3), thereby axially engaging the main body member 41 with the protrusion 4c. Preferably, the engagement tube 41c also circumferentially engages with the protrusion 4c. In this case, the protrusion 4c can be rotated in conjunction with the rotation of the main body member 41. In one example, the engagement tube 41c circumferentially engages with the protrusion 4c by uneven or frictional engagement between the inner circumferential surface of the engagement tube 41c and the outer circumferential surface of the engagement portion 4c3 at a position closer to the discharge port 41f than the engagement protrusion 41c1. In another example, the engagement tube 41c may be circumferentially engaged with the protrusion 4c by uneven or frictional engagement between the engagement protrusion 41c1 and the protrusion 4c at a portion 4c4 below the engagement portion 4c3.

[0023] As shown in FIGS. 3 and 4, the main body member seal tube 41d and the outer shell 3g are in close contact with each other at the contact surface 51. More specifically, the outer peripheral surface 41d1 of the main body member seal tube 41d and the inner peripheral surface 3g1 of the outer shell seal tube 3g are in close contact with each other at the contact surface 51. In this case, the contact surface 51 is disposed on the outer shell seal tube 3g. The contact surface 51 is preferably inclined with respect to the axial direction (i.e., non-parallel to the axial direction). This inclination angle is, for example, 0.5 to 10 degrees (2 degrees in this embodiment), and preferably 1 to 6 degrees. Specific examples of this inclination angle include 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6, 7, 8, 9, and 10 degrees, and may be within a range between any two of the values ​​exemplified here.

[0024] The inner circumferential surface 3g1 is inclined so that its diameter increases toward the tip 3g2 of the outer shell seal tube 3g. This facilitates the outer circumferential surface 41d1 to be tightly attached to the inner circumferential surface 3g1. Furthermore, when the outer circumferential surface 41d1 is tightly attached to the inner circumferential surface 3g1, a tight contact surface 51 is formed. When the outer circumferential surface 41d1 is not pressed against the inner circumferential surface 3g1, the outer circumferential surface 41d1 and the inner circumferential surface 3g1 may be parallel or non-parallel. Even when they are non-parallel, pressing the outer circumferential surface 41d1 against the inner circumferential surface 3g1 changes the inclination angle of at least one of the outer circumferential surface 41d1 and the inner circumferential surface 3g1, thereby allowing the two surfaces to be tightly attached to each other. Typically, the outer shell 3 is thicker than the main body member 41 and / or is made of a material with higher rigidity than the main body member 41, so the outer shell 3 has higher rigidity than the main body member 41. Therefore, pressing the outer circumferential surface 41d1 against the inner circumferential surface 3g1 mainly changes the inclination angle of the outer circumferential surface 41d1.

[0025] The engagement tube 41c and the main body member sealing tube 41d are connected to each other at a position closer to the discharge port 41f in the axial direction than the engagement protrusion 41c1. More specifically, the engagement tube 41c and the main body member sealing tube 41d are connected to each other at the top surface 41g. In other words, the engagement tube 41c and the main body member sealing tube 41d are connected to each other at a position farther from the tip 41c2 of the engagement tube 41c than the engagement protrusion 41c1. This configuration allows the engagement tube 41c and the main body member sealing tube 41d to deform independently of each other, which has the advantage that, for example, deformation of the engagement tube 41c during engagement does not affect the tight contact at the main body member sealing tube 41d.

[0026] The main body member sealing tube 41d does not engage with the outer shell 3 in a convex-concave manner. Because the main body member sealing tube 41d and the outer shell 3 are in close contact with each other, they are frictionally engaged, but they are not engaged in a convex-concave manner in which the convex portions of one fit into the concave portions of the other. This allows the main body member sealing tube 41d to be quickly removed from the outer shell, preventing an increase in the force required to pull out the inner bag 4. Furthermore, because the contact surface 51 is inclined to prevent undercuts, the contact at the contact surface 51 can be broken by slightly moving the main body member 41 away from the outer shell 3. This prevents an increase in the force required to pull out the inner bag 4 due to friction at the contact surface 51.

[0027] The outer cylinder 41e is disposed so as to cover the outer shell seal cylinder 3g. The tip 41e1 of the outer cylinder 41e is disposed adjacent to the second flange portion 3f2. The outer peripheral surface of the outer cylinder 41e is flush with the outer peripheral surface of the second flange portion 3f2. This configuration improves the aesthetic appearance of the double container 1.

[0028] <Use of double container 1> In this embodiment, the discharge valve 42 is provided in the opening-mounted member 8, so that the inner bag 4 contracts as the contents of the inner bag 4 are discharged. Furthermore, by providing an air inlet hole that can introduce outside air into the intermediate space between the outer shell 3 and the inner bag 4, a peelable container can be created in which the inner bag 4 separates from the outer shell 3 and contracts as the contents are discharged. The air inlet hole may be provided in either the outer shell 3 or the opening-mounted member 8. Furthermore, an air inlet valve may be provided in the air inlet hole to allow outside air to be introduced into the intermediate space while suppressing the discharge of outside air from the intermediate space. In this case, compressing the outer shell 3 increases the pressure in the intermediate space, allowing the contents to be discharged from the inner bag 4. When the compressive force on the outer shell 3 is removed and the outer shell 3 returns to its original shape, the introduction of outside air into the intermediate space allows the outer shell 3 to quickly restore its original shape. This configuration makes it possible to realize a squeeze-type peelable container. The double-walled container 1 of this embodiment is characterized by its ability to easily form an airtight space between the outer shell 3 and the inner bag 4, so it is preferable to use it as a squeeze-type peelable container.

[0029] <Pull out inner bag 4> Because the main body member 41 is engaged with the protruding portion 4c in the axial direction, the inner bag 4 can be pulled out of the container body 2 by pulling the main body member 41. Furthermore, if the main body member 41 is also engaged with the protruding portion 4c in the circumferential direction, the inner bag 4 can be twisted and reduced in diameter by rotating the main body member 41. This reduces the force required to pull out the inner bag 4.

[0030] Furthermore, if a cam mechanism is provided between the inner bag 4 and the outer shell 3, the inner bag 4 is configured to move in the direction of coming out of the container body 2 as the inner bag 4 rotates. With this configuration, by rotating the mouth attachment member 8, the inner bag 4 can be moved in the direction of coming out of the container body 2 while twisting, and then the inner bag 4 can be pulled out of the container body 2 by pulling the main body member 41.

[0031] 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. 7. In addition, the double container 1 can be manufactured by attaching a mouth attachment member 8 to the container body 2.

[0032] <Configuration of inner preform 14, outer preform 13, and preform 15> As shown in FIG. 6, the preform 15 includes an inner preform 14 that will become the inner bag 4 and an outer preform 13 that will become the outer shell 3.

[0033] As shown in Fig. 6, 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.

[0034] As shown in FIG. 7, the preform 15 can be formed by covering the inner preform 14 with the outer preform 13. The mouth portions 13a, 14a become the mouth portion 15a of the preform 15, the body portions 13b, 14b become the body portion 15b of the preform 15, and the bottom portions 13c, 14c become the bottom portion 15c of the preform 15. During biaxial stretch blow molding, the portion below the flange 13d (the body portion 15b and the bottom portion 15c) is mainly stretched. 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.

[0035] <Materials and manufacturing methods for 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 (for example, PET) or polyolefin (for example, polypropylene, polyethylene).

[0036] 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. Direct blow molding has the advantage that it is easier to make thinner and multi-layered preforms than injection molding.

[0037] 2. Second embodiment A second embodiment of the present invention will be described with reference to Figures 8 and 9. This embodiment is similar to the first embodiment, and the details described in the first embodiment can also be applied to this embodiment as long as they do not contradict the spirit of the first embodiment. This embodiment differs mainly from the first embodiment in the shapes of the mouth-mounted member 8 and the outer shell 3. The following description will focus on these differences.

[0038] In this embodiment, the inner peripheral surface 41d2 of the main body member seal tube 41d and the outer peripheral surface 3g3 of the outer shell seal tube 3g are in close contact with each other at a contact surface 51. The contact surface 51 is preferably inclined with respect to the axial direction. This inclination angle is, for example, 0.5 to 10 degrees (5 degrees in this embodiment), and preferably 3 to 8 degrees. Specific examples of this inclination angle are 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, and 10.0 degrees, and may be in a range between any two of the values ​​exemplified here.

[0039] The outer peripheral surface 3g3 is inclined so that its diameter decreases toward the tip 3g2 of the outer shell seal tube 3g. This makes it easier to bring the inner peripheral surface 41d2 into close contact with the outer peripheral surface 3g3. When the inner peripheral surface 41d2 is brought into close contact with the outer peripheral surface 3g3, a close contact surface 51 is formed. When the inner peripheral surface 41d2 is not pressed against the outer peripheral surface 3g3, the inner peripheral surface 41d2 and the outer peripheral surface 3g3 may be parallel or non-parallel.

[0040] In this embodiment, the main body member 41 does not have an outer tube 41e. The tip 41d3 of the main body member sealing tube 41d is located close to the first flange portion 3f1. The outer peripheral surface of the main body member sealing tube 41d is flush with the outer peripheral surfaces of the first and second flange portions 3f1, 3f2. This configuration improves the aesthetic appearance of the double container 1.

[0041] 3. Third embodiment A third embodiment of the present invention will be described using Figures 10 to 12. This embodiment is similar to the above-described embodiment, and the contents described in the above-described embodiment can also be applied to this embodiment as long as they do not contradict the spirit of the embodiment. This embodiment is mainly different from the first embodiment in the shapes of the mouth-attached member 8, inner bag 4, and outer shell 3. The following description will focus on these differences.

[0042] 10, the spout-mounted member 8 includes a main body member 41 and a discharge member 43. The discharge member 43 has a discharge opening 43a that communicates with the interior of the inner bag 4.

[0043] As shown in FIGS. 11 and 12, the main body member 41 has an insertion hole 41h through which the protruding portion 4c is inserted. The protruding portion 4c is inserted through the insertion hole 41h. The discharge member 43 is attached to a tip portion 4c5 of the protruding portion 4c that protrudes from the main body member 41 through the insertion hole 41h. More specifically, an engagement portion 4c6 is provided at the tip portion 4c5, and the discharge member 43 is attached to the tip portion 4c5 by engaging with the engagement portion 4c6. In this embodiment, the engagement portion 4c6 is a male thread portion 4c12 provided on the outer surface of the tip portion 4c5, and this male thread portion is threadedly engaged with a female thread portion 43b provided on the inner circumferential surface of the discharge member 43. The discharge member 43 may be attached to the tip portion 4c5 in a plug-type manner.

[0044] The main body member 41 includes an inner tube 41b and a main body member seal tube 41d. The inner tube 41b has a smaller outer diameter than the main body member seal tube 41d. The main body member seal tube 41d is provided with an engaging protrusion 41d4 that axially engages with the protrusion 4c. The engaging protrusion 41d4 axially engages with the protrusion 4c (more specifically, with the engaging portion 4c3), thereby axially engaging the main body member 41 with the protrusion 4c. It is also preferable that the main body member seal tube 41d circumferentially engages with the protrusion 4c. In this case, the protrusion 4c can be rotated in conjunction with the rotation of the main body member 41. The inner tube 41b and the main body member seal tube 41d are connected to each other at a top surface 41g. An insertion hole 41h is provided in the top surface 41g.

[0045] The inner peripheral surface 41d2 of the main body member sealing tube 41d and the outer peripheral surface 3g4 at a position adjacent to the open end 3a of the outer shell 3 are in close contact with each other at a contact surface 51. The contact surface 51 is preferably inclined with respect to the axial direction. This inclination angle is, for example, 0.5 to 15 degrees (7.5 degrees in this embodiment), and preferably 3 to 10 degrees. Specific examples of this inclination angle are 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 11, 12, 13, 14, and 15 degrees, and may be in a range between any two of the values ​​exemplified here.

[0046] Additionally, the inner peripheral surface 41b1 of the inner cylinder 41b is in close contact with the outer peripheral surface 4c7 of the protruding portion 4c. A contact surface 52 between the inner peripheral surface 41b1 of the inner cylinder 41b and the outer peripheral surface 4c7 of the protruding portion 4c is preferably inclined with respect to the axial direction. This inclination angle is, for example, 0.5 to 15 degrees (6.7 degrees in this embodiment), and preferably 3 to 10 degrees. Specific examples of this inclination angle include 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 11, 12, 13, 14, and 15 degrees, and may be within a range between any two of the values ​​exemplified here.

[0047] Also with the configuration of this embodiment, the main body member 41 is in close contact with both the outer shell 3 and the inner bag 4, so that an airtight space can be formed between the outer shell 3 and the inner bag 4.

[0048] 12, a tip 4c8 of the protrusion 4c is provided with a reduced-diameter portion 4c9 formed by bending a portion adjacent to the tip 4c8 radially inward. If the inner diameter of the reduced-diameter portion 4c9 is Di and the outer diameter is Do, Di / Do is, for example, 0.60 to 0.95 (0.80 in this embodiment), and preferably 0.70 to 0.90. Specific examples of this value are 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, and 0.95, and may be within a range between any two of the values ​​exemplified here.

[0049] If the thickness of the reduced diameter portion 4c9 at the inner circumferential surface 4c13 is T, the value of {(Do - Di) / T} is, for example, 2.5 or more (5.0 in this embodiment), and preferably 3.5 or more. This value is, for example, 2.5 to 15, and preferably 3.5 to 10, and specifically, for example, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 11, 12, 13, 14, or 15, and may be in a range between any two of the values ​​exemplified here. The thickness T is, for example, 0.40 to 1.20 mm, and preferably 0.50 to 1.00 mm. Specific examples of this thickness include 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 1.05, 1.10, 1.15, and 1.20 mm, and may be in a range between any two of the values ​​exemplified here.

[0050] A sealing member 44 is welded to an upper surface 4c10 of the reduced diameter portion 4c9. In one example, the sealing member 44 is configured by laminating a sealant layer and a gas barrier layer, and the sealant layer is welded to the upper surface 4c10. In one example, the gas barrier layer is an aluminum layer. By welding the sealing member 44 configured in this way to the upper surface 4c10 and closing the opening 4c11 at the tip 4c8, deterioration of the contents in the inner bag 4 is suppressed. At the start of use, the discharge member 43 can be temporarily removed, the sealing member 44 can be peeled off, and then the discharge member 43 can be reattached to the tip portion 4c5.

[0051] The upper surface 4c10 of the reduced diameter portion 4c9 is preferably inclined so as to rise toward the radial center of the protruding portion 4c (i.e., toward the outside of the protruding portion 4c in the axial direction). The inclination angle of the upper surface 4c10 with respect to the horizontal plane (i.e., a plane perpendicular to the axial direction) is, for example, 1 to 25 degrees (12 degrees in this embodiment), and preferably 5 to 20 degrees. When this inclination angle is within the above range, welding defects of the seal member 44 are unlikely to occur. Specifically, this inclination angle may be, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25 degrees, or may be within a range between any two of the values ​​exemplified here.

[0052] Discharge member 43 includes a discharge member body 45 and an overcap 46. Discharge member body 45 includes a nozzle 45a and an engaging tube 45b. Nozzle 45a and engaging tube 45b are connected to each other at top surface 45c. Nozzle 45a is provided with a discharge port 45d that communicates with the interior of inner bag 4, allowing the contents inside inner bag 4 to be discharged through nozzle 45a and discharge port 45d. Nozzle 45a is provided with a discharge valve 42. Discharge port 45d can be closed using overcap 46, and when in use, overcap 46 can be removed to open discharge port 45d and discharge the contents.

[0053] 4. Fourth embodiment A fourth embodiment of the present invention will be described with reference to Figures 13 to 15. This embodiment is similar to the above-described embodiment, and the contents described in the above-described embodiment can also be applied to this embodiment as long as they do not contradict the spirit of the embodiment. This embodiment differs mainly from the third embodiment in the shapes of the main body member 41 and the outer shell 3. The following description will focus on these differences.

[0054] In this embodiment, the main body member 41 includes an inner tube 41b, an engaging tube 41c, and a main body member sealing tube 41d. The outer diameters of these cylindrical portions increase in this order. These cylindrical portions are connected to each other at a top surface 41g. The engaging tube 41c and the main body member sealing tube 41d are connected to each other at a position farther from the tip 41c2 of the engaging tube 41c than the engaging protrusion 41c1.

[0055] In this embodiment, the inner peripheral surface 41d2 of the main body member seal tube 41d and the outer peripheral surface 3g3 of the outer shell seal tube 3g are in close contact with each other at a contact surface 51. The contact surface 51 is preferably inclined with respect to the axial direction. This inclination angle is, for example, 0.5 to 15 degrees (5.8 degrees in this embodiment), and preferably 3 to 10 degrees. Specific examples of this inclination angle are 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 11, 12, 13, 14, and 15 degrees, and may be in a range between any two of the values ​​exemplified here.

[0056] Also with the configuration of this embodiment, the main body member 41 is in close contact with both the outer shell 3 and the inner bag 4, so that an airtight space can be formed between the outer shell 3 and the inner bag 4.

[0057] 5. Fifth embodiment A fifth embodiment of the present invention will be described using Figures 16 and 17. This embodiment is similar to the above-described embodiment, and the details described in the above-described embodiment can also be applied to this embodiment as long as they do not contradict the spirit of the embodiment. This embodiment is mainly different from the first embodiment in the shapes of the mouth-attached member 8, inner bag 4, and outer shell 3. The following description will focus on these differences.

[0058] In this embodiment, the main body member seal cylinder 41d is provided with an engaging protrusion 41d4 that engages with the protrusion 4c in the axial direction. The engaging protrusion 41d4 engages with the protrusion 4c (more specifically, with the engaging portion 4c3) in the axial direction, thereby engaging the main body member 41 with the protrusion 4c in the axial direction.

[0059] A gap 2a is provided between the outer shell 3 and the inner bag 4 at the open end 3a of the outer shell 3. The tip 41i of the main body member sealing tube 41d is inserted into the gap 2a, and the outer peripheral surface 41i1 of the tip 41i is in close contact with the inner peripheral surface 3h of the outer shell 3. In this manner, in this embodiment, the contact surface 51 between the main body member 41 and the outer shell 3 is the surface where the outer peripheral surface 41i1 of the main body member sealing tube 41d and the inner peripheral surface 3h of the outer shell 3 are in close contact. Also, as in the first embodiment, the outer peripheral surface of the inner tube 41b of the main body member 41 is in close contact with the inner peripheral surface of the reduced diameter portion 4c2 of the inner bag 4. With this configuration, the main body member 41 is in close contact with both the outer shell 3 and the inner bag 4, thereby forming an airtight space between the outer shell 3 and the inner bag 4. In order to stably bring the outer peripheral surface 41i1 of the tip portion 41i and the outer shell 3 into close contact, it is preferable that the inner peripheral surface 41i2 of the tip portion 41i be in close contact with the outer peripheral surface 4c14 of the inner bag 4.

[0060] It is preferable that the tip portion 41i including the contact surface 51 is a soft portion made of elastomer to improve adhesion with the outer shell 3. It is also preferable that the portions other than the tip portion 41i are made of a resin (for example, a polyolefin such as polyethylene or polypropylene) that is more rigid than the tip portion 41i. It is preferable that the tip portion 41i and the other portions are integrally molded by two-color molding or the like.

[0061] In this embodiment, the engaging protrusion 41d4 of the main body member sealing tube 41d is engaged with the engaging portion 4c3, but as in the first embodiment, an engaging tube 41c having an engaging protrusion 41c1 may be provided, and the engaging protrusion 41c1 may be engaged with the engaging portion 4c3.

[0062] A flange portion 3f is provided at the open end 3a of the outer shell 3. A tip 41e1 of the outer cylinder 41e is disposed adjacent to the flange portion 3f. The outer peripheral surface of the outer cylinder 41e is flush with the outer peripheral surface of the flange portion 3f. This configuration improves the aesthetic appearance of the double container 1. The discharge valve 42 is fixed to the underside of the top surface 41g. This makes it easier to insert the inner cylinder 46a of the overcap 46 into the nozzle 41a.

[0063] 6. Sixth embodiment A sixth embodiment of the present invention will be described using Figures 18 and 19. This embodiment is similar to the above-described embodiments, and the details described in the above-described embodiments can also be applied to this embodiment as long as they are not contrary to the spirit of the embodiments. This embodiment differs mainly from the fifth embodiment in the shapes of the mouth-attached member 8, inner bag 4, and outer shell 3. The following description will focus on these differences.

[0064] In this embodiment, the main body member seal cylinder 41d is provided with an engaging protrusion 41d4, and the inner circumferential surface 41d2 at a position closer to the tip 41d3 than the engaging protrusion 41d4 is in close contact with the outer circumferential surface 3g4 at a position adjacent to the open end 3a of the outer shell 3. Therefore, the contact surface 51 is provided in a portion adjacent to the open end 3a of the outer shell 3.

[0065] The main body member sealing tube 41d engages with the outer shell 3 at a position farther from the open end 3a of the outer shell 3 than the contact surface 51. In this embodiment, the outer shell 3 and the main body member sealing tube 41d are engaged by threading the male thread portion 3i on the outer shell 3 with the female thread portion 41j on the main body member sealing tube 41d. However, the outer shell 3 and the main body member sealing tube 41d may be snap-engaged (engaged by snap fit or by capping). When the outer shell 3 and the main body member sealing tube 41d are snap-engaged, it is preferable to provide the main body member 41 with a structure that allows the engagement between the outer shell 3 and the main body member sealing tube 41d to be released by tearing a portion of the main body member 41. Furthermore, the outer peripheral surface of the inner tube 41b of the main body member 41 is in close contact with the inner peripheral surface of the inner bag 4. With this structure, the main body member 41 is in close contact with both the outer shell 3 and the inner bag 4, thereby forming an airtight space between the outer shell 3 and the inner bag 4. As shown in the third and fourth embodiments, the main body member 41 may be configured to be in close contact with the outer peripheral surface of the inner bag 4. The same applies to the other embodiments.

[0066] The tip 4c8 of the protrusion 4c is provided with an expanded diameter portion 4c15 formed by bending a portion adjacent to the tip 4c8 radially outward. The engagement portion 4c3 is formed by the expanded diameter portion 4c15. The engagement protrusion 41d4 is disposed between the engagement portion 4c3 and the open end 3a.

[0067] The tip 41d3 of the main body member sealing cylinder 41d is disposed close to the flange portion 3f. The outer peripheral surface of the main body member sealing cylinder 41d is flush with the outer peripheral surface of the flange portion 3f. This configuration improves the aesthetic appearance of the double container 1.

[0068] In Modification 1 shown in Figures 20 and 21, the outer shell 3 has a plurality of annular protrusions 47 arranged along the axial direction at the contact surface 51. Each of the plurality of annular protrusions 47 comes into close contact with the main body member seal tube 41d, thereby improving the contact. In Figures 20 and 21, the plurality of annular protrusions 47 may be provided on the main body member seal tube 41d, or may be provided on both the outer shell 3 and the main body member seal tube 41d.

[0069] In Modification 2 shown in FIGS. 22 and 23, the contact surface 51 is inclined with respect to the axial direction. The outer peripheral surface 3g4 is inclined so that the diameter decreases toward the open end 3a. This tends to improve the contact at the contact surface 51. The inclination angle is, for example, 0.5 to 10 degrees (4 degrees in this embodiment), and preferably 1 to 8 degrees. Specific examples of the inclination angle are 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6, 7, 8, 9, and 10 degrees, and may be in a range between any two of the values ​​exemplified here.

[0070] 7. Seventh embodiment A seventh embodiment of the present invention will be described using Figures 24 and 25. This embodiment is similar to the above-described embodiments, and the details described in the above-described embodiments can also be applied to this embodiment as long as they are not contrary to the spirit of the embodiments. This embodiment differs mainly from the sixth embodiment in the shapes of the mouth-attached member 8, inner bag 4, and outer shell 3. The following description will focus on these differences.

[0071] In this embodiment, the inner circumferential surface 41d2 at a position adjacent to the tip 41d3 of the main body member sealing cylinder 41d is in close contact with the outer circumferential surface 3g4 at a position adjacent to the open end 3a of the outer shell 3. Therefore, at the contact surface 51, the portion adjacent to the tip 41d3 of the main body member sealing cylinder 41d is in close contact with the portion adjacent to the open end 3a of the outer shell 3. The configurations of Modifications 1 and 2 of the sixth embodiment can also be applied to this embodiment.

[0072] The inner bag 4 is provided with a contact protrusion 4v that protrudes radially outward, and the inner bag 4 is stably supported by the outer shell 3 by the contact protrusion 4v coming into contact with the open end 3a.

[0073] Main body member sealing tube 41d is provided with female thread portion 41j and engaging protrusion 41d4, in that order from the tip 41d3 side. Protrusion 4c of inner bag 4 is provided with male thread portion 4c12 and engaging portion 4c3, in that order from the base side of protrusion 4c. When female thread portion 41j and male thread portion 4c12 are screwed together, engaging protrusion 41d4 snaps into engaging portion 4c3, and main body member 41 is stably supported by protrusion 4c.

[0074] 8. Eighth embodiment An eighth embodiment of the present invention will be described using Figures 26 and 27. This embodiment is similar to the above-described embodiments, and the details described in the above-described embodiments can also be applied to this embodiment as long as they are not contrary to the spirit of the embodiments. This embodiment differs mainly from the sixth embodiment in the shapes of the mouth-attached member 8, inner bag 4, and outer shell 3. The following description will focus on these differences.

[0075] In this embodiment, the tip 41d3 of the main body member sealing tube 41d is in close contact with the upper surface 3f3 of the flange portion 3f of the outer shell 3. Therefore, the contact surface 51 is provided at the tip 41d3 of the main body member sealing tube 41d. To improve the contact at the contact surface 51, the tip portion 41k including the contact surface 51 is preferably a soft portion made of elastomer. Furthermore, the portions other than the tip portion 41k are preferably made of a resin (for example, a polyolefin such as polyethylene or polypropylene) that is more rigid than the tip portion 41k. The tip portion 41k and the other portions are preferably integrally molded by two-color molding or the like.

[0076] It is preferable that the main body member 41 engages with the outer shell 3. This makes it easy to press the tip 41d3 axially against the upper surface 3f3, thereby increasing adhesion. It is also more preferable that the main body member 41 and the outer shell 3 are screwed together. In this case, it is easy to increase the force that presses the tip 41d3 axially against the upper surface 3f3. In this embodiment, the male thread portion 3i provided on the outer shell 3 and the female thread portion 41j provided on the main body member seal tube 41d are screwed together. Furthermore, this screwing allows the engaging protrusion 41d4 to snap-engage with the engaging portion 4c3.

[0077] 9. Ninth embodiment A ninth embodiment of the present invention will be described using Figures 28 to 30. This embodiment is similar to the above-described embodiments, and the contents described in the above-described embodiments can also be applied to this embodiment as long as they do not contradict the spirit of the embodiments. This embodiment differs mainly from the sixth embodiment in the shapes of the mouth-attached member 8, inner bag 4, and outer shell 3. The following description will focus on these differences.

[0078] In the above embodiment, the main body member 41 and the outer shell 3 are in direct contact with each other at the contact surface 51. However, in the present embodiment, the main body member 41 and the outer shell 3 are in contact with each other at the contact surface 51 via another member. Specifically, in the present embodiment, the other member is a soft member 53 disposed between the open end 3a of the outer shell 3 and the main body member 41 (more specifically, the top surface 41g), and the main body member 41 and the outer shell 3 are in contact with each other via the soft member 53. The upper and lower surfaces of the soft member 53 each serve as the contact surface 51. The soft member 53 is made of an elastomer. Note that, even in the above embodiment, the main body member 41 and the outer shell 3 may be configured to be in contact with each other via another member.

[0079] The main body member seal tube 41d is provided with a support protrusion 41d5, and the soft member 53 is supported by the support protrusion 41d5 and attached to the main body member 41. This configuration improves the handleability of the soft member 53. The support protrusion 41d5 is preferably provided in an annular shape.

[0080] A protrusion 3a4 is provided at the open end 3a of the outer shell 3, and the protrusion 3a4 is pressed against the soft member 53 to improve the sealing between the soft member 53 and the open end 3a. The protrusion 3a4 is preferably tapered toward the tip and is preferably annular. [Explanation of symbols]

[0081] 1:Double container 2: Container body 2a: Gap 3: Outer shell 3a: Open end 3a1: Base surface 3a3: inner bag support surface 3a4: Protrusion 3f: Flange part 3f1: First flange 3f2: Second flange part 3f3:Top surface 3g: Outer shell seal tube 3g1 :Inner peripheral surface 3g2: Tip 3g3: Outer peripheral surface 3g4: Outer peripheral surface 3h: Inner peripheral surface 3i: Male screw part 3l: Cam rail 4: Inner bag 4a: First cylinder 4b: Second cylinder 4b4: Bottom surface 4c: Protrusion 4c1: Diameter-expanded part 4c10: Top surface 4c11: Opening 4c12: Male screw part 4c13: Inner peripheral surface 4c14: Outer peripheral surface 4c15: Diameter-expanded part 4c2: Diameter-reduced part 4c3: Engaging part 4c4: Part 4c5: Tip part 4c6: Engaging part 4c7: Outer peripheral surface 4c8: Tip 4c9: Diameter-reduced part 4d: Inner bag body 4g: Rib 4v: Contact convex part 5: Mouth part 5c: Open end 6: Barrel part 6b: Shoulder 6c: Barrel body 7: Bottom 8: Mouth part mounting member 8a: Cap 13: Outer preform 13a: Mouth part 13b: Barrel part 13c: Bottom 13d: Flange 14: Inner preform 14a: Mouth part 14b: Barrel part 14c: Bottom 15: Preform 15a: Mouth part 15b: Barrel part 15c: bottom 41: Main body member 41a: Nozzle 41b: Inner cylinder 41b1: Inner peripheral surface 41c: Engagement tube 41c1: Engagement convex part 41c2: Tip 41d: Main body member seal tube 41d1: Outer surface 41d2: Inner peripheral surface 41d3: Tip 41d4: Engagement protrusion 41d5: Support protrusion 41e: Outer cylinder 41e1 : Tip 41f:Discharge port 41g:Top part 41h: Insertion hole 41i:Tip 41i1: Outer surface 41i2: Inner surface 41j: Female thread 41k:Tip 42: Discharge valve 43: Discharge member 43a:Discharge port 43b: Female thread 44: Sealing material 45: Discharge member body 45a: Nozzle 45b: Engagement tube 45c: Top part 45d:Discharge port 46: Overcap 46a: Inner cylinder 47: Annular convex part 51: Contact surface 52: Contact surface 53: Soft material C: Central axis T:Thickness

Claims

1. A double container comprising a container body and a mouth attachment member attached to the mouth of the container body, The container body includes an inner bag and an outer shell disposed to cover the inner bag, the inner bag has a protrusion protruding from the open end of the outer shell, If the direction in which the central axis of the mouth of the container body extends is defined as the axial direction, The mouth-mounted member includes a body member; the body member is engaged with the protrusion in the axial direction; the main body member has a discharge port communicating with the inside of the inner bag or an insertion hole through which the protrusion is inserted, A double container in which the main body member and the outer shell are in close contact with each other at their contact surfaces, either directly or via another member.

2. The double container according to claim 1, the body member includes a body member seal tube; A double container, wherein the main body member sealing tube and the outer shell are in close contact with each other at the contact surface, either directly or via another member.

3. The double container according to claim 2, The double container, wherein the contact surface is inclined with respect to the axial direction.

4. The double container according to claim 2, The main body member includes an engagement tube, the engaging cylinder includes an engaging protrusion that engages with the protrusion in the axial direction, The double container, wherein the engaging tube and the main body member sealing tube are connected to each other at a position farther from the tip of the engaging tube than the engaging protrusion.

5. The double container according to claim 2, The body member sealing tube is not in a convex-concave engagement with the outer shell.

6. The double container according to claim 2, the shell includes a shell seal tube; The sealing surface is disposed on the outer shell sealing tube.

7. The double container according to claim 6, The contact surface is a surface where the outer peripheral surface of the main body member seal tube and the inner peripheral surface of the outer shell seal tube are in close contact with each other.

8. The double container according to claim 2, The body member includes an inner cylinder having an outer diameter smaller than that of the body member seal cylinder, The inner peripheral surface of the inner cylinder is in close contact with the outer peripheral surface of the protrusion.

9. The double container according to claim 8, A double container, wherein the contact surface between the inner peripheral surface of the inner cylinder and the outer peripheral surface of the protrusion is inclined with respect to the axial direction.

10. The double container according to claim 2, the main body member has an insertion hole through which the protrusion is inserted, the spout attachment member includes a discharge member having a discharge port communicating with the interior of the inner bag, The discharge member is attached to the tip of the protruding portion that protrudes from the main body member through the insertion hole.

11. The double container according to claim 2, The contact surface is a surface where the outer peripheral surface of the main body member sealing tube and the inner peripheral surface of the outer shell are in close contact with each other.

12. The double container according to claim 2, The sealing surface is provided at the tip of the main body member sealing tube, forming a double container.

13. The double container according to claim 11, The main body member sealing cylinder has a soft part made of elastomer integrally molded therewith so as to include the contact surface.

14. The double container according to claim 1, the other member is a soft member made of elastomer, The soft member is disposed between the open end of the outer shell and the body member.

15. The double container according to claim 12, The body member and the outer shell are threadedly engaged.

16. The double container according to claim 2, The sealing surface is provided at a position adjacent to the open end of the outer shell.

17. 17. The double container according to claim 16, The body member sealing tube engages with the outer shell at a position farther from the open end of the outer shell than the contact surface.

18. 17. The double container according to claim 16, A double container, wherein the contact surface is in close contact with a portion adjacent to the tip of the main body member sealing tube and a portion adjacent to the open end of the outer shell.

19. 17. The double container according to claim 16, A double container, wherein at least one of the outer shell and the main body member sealing tube has a plurality of annular protrusions arranged along the axial direction at the contact surface.

20. A method for manufacturing a double container according to any one of claims 1 to 19, The method, wherein the container body of the double container is manufactured by biaxially stretched blow molding.

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