Container and method of manufacturing the same, double-layered container

Abstract

Provided is a container capable of introducing a rotation restriction structure while improving the degree of freedom in selecting a mouth portion mounting member. According to the present invention, a container is provided, which includes a container main body and a mouth portion mounting member mounted to a mouth portion of the container main body, the mouth portion mounting member being configured to be mounted to the mouth portion in a pressure lid manner, the container main body including an axial engagement portion that engages with the mouth portion mounting member in an axial direction and a circumferential engagement portion that engages with the mouth portion mounting member in a circumferential direction, the axial direction being a direction in which a central axis of the mouth portion extends, the circumferential direction being a direction of rotation about the central axis, the circumferential engagement portion being disposed at a position farther from an opening end of the mouth portion than the axial engagement portion, the mouth portion mounting member including an engagement portion, the engagement portion of the mouth portion mounting member engaging with the axial engagement portion in the axial direction and engaging with the circumferential engagement portion in the circumferential direction. Furthermore, the container of the present invention has excellent recyclability, and thus can be suitably used in the production of recycled materials.

Description

Technical Field

[0001] This invention relates to containers and methods for manufacturing the same, as well as double-walled containers. Background Technology

[0002] (Part 1) Patent document 1 discloses a structure in which a discharge tool engages with a portion protruding from the outer layer of a double-layered container.

[0003] (Part 2) Patent document 2 discloses a double-layer container configured such that by rotating a mouth mounting member that engages with the inner bag in the circumferential direction relative to the outer shell, the inner bag is rotated relative to the outer shell, thereby twisting the inner bag to reduce its diameter, and then the inner bag can be pulled out from the container body by pulling the mouth mounting member.

[0004] (Aspects 3 and 4) Double-layer containers having a container body consisting of an outer shell and an inner bag are known in the past. For example, Patent Document 3 discloses a double-layer container formed by biaxial stretch blow molding with the outer shell preform and the inner bag preform overlapping.

[0005] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2023-67209 Patent Document 2: Japanese Patent Application Publication No. 2024-018821 Patent Document 3: Japanese Patent Application Publication No. 2019-10741 Summary of the Invention The problem the invention aims to solve (Part 1) In Patent Document 1, the rotation of the discharge tool in the circumferential direction is restricted by engaging the anti-rotation ribs provided on the discharge tool with the longitudinal ribs provided on the inner body in the circumferential direction.

[0006] This rotational restriction structure is predicated on the use of a specific type of discharge tool, and cannot be used with commercially available discharge tools.

[0007] The present invention was made in view of the above circumstances, and aims to provide a container that can introduce a rotation restriction structure while increasing the freedom of choice of mouth mounting components.

[0008] (Part 2) In the double-layered container of Patent Document 2, the mouth mounting component is installed on the inner bag in a snap-on manner, and even if the mouth mounting component is rotated relative to the inner bag, it will not detach from the inner bag. On the other hand, some commercially available mouth mounting components are screw-on type. If such a mouth mounting component is installed on the inner bag, when torque is applied to the mouth mounting component to rotate the inner bag relative to the outer shell, it is possible that the mouth mounting component and the inner bag will rotate relative to each other, rather than the inner bag and the outer shell rotating relative to each other. Therefore, it is currently impossible to use a screw-on type mouth mounting component. Furthermore, even with a snap-on type mouth mounting component, if the mouth mounting component and the inner bag are not engaged circumferentially, even if the mouth mounting component is rotated relative to the outer shell, the inner bag will not be able to rotate relative to the outer shell. Due to the above, the current situation restricts the freedom of choice in the mouth mounting component.

[0009] The present invention was made in view of the above circumstances, and aims to provide a double-layered container that can twist the inner bag to reduce its diameter while increasing the freedom of choice of mouth mounting components.

[0010] (Part 3) In addition, when the outer shell and inner bag of such a double-layered container are made of different materials, or when the inner bag is filled with contents after use, it is desirable to separate the outer shell from the inner bag when recycling the double-layered container.

[0011] The outer shell and inner bag can be separated by the user pulling the inner bag out of the outer shell, which is intended to reduce the force required to pull out the inner bag. Furthermore, excellent contents discharge properties are also desired for the double-walled container.

[0012] The present invention was made in view of the above circumstances, and aims to provide a double-layered container that can reduce the force required to pull out the inner bag and has excellent contents discharge properties.

[0013] (Aspect 4) In addition, when the outer shell and inner bag of such a double-layered container are made of different materials, or when the inner bag is filled with contents after use, it is desirable to separate the outer shell from the inner bag when recycling the double-layered container.

[0014] The outer shell and inner bag can be separated by pulling the inner bag out of the container body. To simplify the operation of pulling the inner bag out of the container body as much as possible, a method is considered that after the cap and the inner bag are axially engaged, the inner bag is pulled out by pulling the cap.

[0015] However, to prevent leakage of the inner bag contents, the lid is installed to seal the opening of the inner bag. If you try to pull out the inner bag with the lid on, the inner bag will not shrink because the air inside cannot be expelled, which can sometimes make it difficult to pull out the inner bag.

[0016] The present invention was made in view of the above circumstances and aims to provide a double-layered container in which the inner bag can be easily pulled out from the container body.

[0017] means for solving problems (Part 1) According to the present invention, the following invention is provided.

[0018] [1] A container having a container body and a mouth mounting member mounted on the mouth of the container body, the mouth mounting member being configured to be mounted on the mouth in a pressure-fitting manner, the container body having an axially engaging portion that engages with the mouth mounting member in an axial direction and a circumferentially engaging portion that engages with the mouth mounting member in a circumferential direction, the axial direction being the direction of extension of the central axis of the mouth, the circumferential direction being the direction of rotation centered on the central axis, the circumferentially engaging portion being disposed at a position farther from the opening end of the mouth than the axially engaging portion, the mouth mounting member having an engaging portion that engages with the axially engaging portion in an axial direction and with the circumferentially engaging portion in a circumferential direction.

[0019] [2] The container as described in [1], wherein the circumferential engaging portion has a plurality of engaging protrusions arranged at intervals along the circumferential direction.

[0020] [3] The container as described in [1] or [2], wherein the axial engagement portion has an annular protrusion.

[0021] [4] The container as described in any one of [1] to [3], wherein the container body has an inner bag and an outer shell configured to cover the inner bag, the inner bag having a protrusion protruding from the opening end of the outer shell, and the axial engaging portion and the circumferential engaging portion being disposed on the protrusion.

[0022] [5] The container as described in any one of [1] to [4], wherein the mouth mounting component has an outer cylinder and the engaging portion is disposed on the inner circumferential surface of the outer cylinder.

[0023] (Part 2) According to the present invention, the following invention is provided.

[0024] [1] A double-layer container having a container body, a locking component and a mouth mounting component, the container body having an inner bag and an outer shell configured to cover the inner bag, the inner bag having a protrusion protruding from an open end of the outer shell, the mouth mounting component being mounted on the protrusion and engaging in a circumferential locking portion, the locking component engaging with the protrusion in the circumferential direction.

[0025] [2] The double-layer container as described in [1], wherein the container body is configured such that, when viewed from above the double-layer container, the inner bag is displaced in a direction that is dislodged from the container body when the inner bag is rotated relative to the outer shell in one direction.

[0026] [3] The double-layered container as described in [2], wherein the mouth mounting member and the protrusion are threadedly engaged in such a way that the rotation of the mouth mounting member relative to the protrusion in one direction is a loosening direction of the threaded engagement.

[0027] [4] The double-layer container as described in any one of [1] to [3], wherein, at the circumferential engagement portion, the engagement member and the protrusion engage in a concave-convex engagement in the circumferential direction.

[0028] [5] A double-layered container as described in any one of [1] to [4], wherein the protrusion is provided with an external thread, the inner bag is provided with a flange, the lower surface of the flange abuts against the outer shell, and the circumferential engagement portion is disposed between the external thread and the flange.

[0029] [6] The double-layered container as described in any one of [1] to [5], wherein the protrusion is disposed within the opening provided in the engaging member.

[0030] [7] The double-layer container as described in [6], wherein the engaging member has a cylindrical portion and a top portion disposed on the top surface of the cylindrical portion, the opening is disposed on the top portion, and the peripheral surface of the opening engages with the outer peripheral surface of the protrusion in the circumferential direction.

[0031] [8] The double-layer container as described in [7], wherein the protrusion is provided with an external thread, the inner bag is provided with a flange, the lower surface of the flange abuts against the outer shell, the circumferential engaging portion is disposed between the external thread and the flange, the upper surface of the flange abuts against the top surface, and the cylindrical portion of the engaging component is arranged to surround the outer shell.

[0032] (Part 3) According to the present invention, the following invention is provided.

[0033] [1] A double-layered container has a container body, the container body having an inner bag and an outer shell arranged to cover the inner bag, the inner bag being removable from the container body, the container body having a mouth, a body, and a bottom, the mouth being a cylindrical portion having an open end, the body being disposed on a side farther from the open end than the mouth and adjacent to the mouth, and the bottom being configured to close the lower end of the body. If the direction of the central axis extending from the mouth of the container body is taken as the axial direction, and the total height of the container body is taken as H, then the body... The part with the largest perimeter at the cross-section perpendicular to the axial direction is defined as the maximum perimeter part. The height of the maximum perimeter part from the bottom surface of the container body is defined as Hmax. The body part has a shoulder part, which is configured such that the perimeter at the cross-section perpendicular to the axial direction increases as it moves away from the opening. The ratio of Hmax / H is 0.20 to 0.40. If the outer diameter along the major axis direction at the maximum perimeter part is defined as DLmax, and the outer diameter along the minor axis direction perpendicular to the major axis direction is defined as DSmax, then the ratio of DSmax / DLmax is 0.70 to 0.95.

[0034] [2] As described in [1], in the double-layer container, if the part with the smallest circumference in the cross section perpendicular to the axial direction of the body is taken as the minimum circumference part, the height of the minimum circumference part from the bottom surface of the container body is taken as Hmin, and the outer diameter of the minimum circumference part in the long axis direction is taken as DLmin, then (DLmax-DLmin) / (Hmin-Hmax) is 0.26~0.46.

[0035] [3] The double-layer container as described in [2], wherein Hmin / H is 0.80~0.90.

[0036] [4] The double-layered container as described in any one of [1] to [3], wherein the body has an inwardly protruding inwardly curved portion and an outwardly protruding outwardly curved portion, the outwardly curved portion being disposed on a side closer to the bottom surface than the inwardly curved portion, the portion with the largest circumference being disposed on the outwardly curved portion, and if the height of the junction of the inwardly curved portion and the outwardly curved portion from the bottom surface is taken as Hb, and the outer diameter in the long axis direction at the junction is taken as DLb, then (DLmax-DLb) / (Hb-Hmax) is 0.28 to 0.48.

[0037] [5] The double-layer container as described in [4], wherein Hb / H is 0.45 to 0.75.

[0038] (Aspect 4) According to the present invention, the following invention is provided.

[0039] [1] A double-layer container has a container body and an opening mounting member installed at the opening of the container body. The container body has an inner bag and an outer shell arranged to cover the inner bag. If the direction of the central axis extending from the opening of the container body is taken as the axial direction, the opening mounting member has a main body part and an opening and closing part. The main body part engages with the inner bag in the axial direction and has a discharge port communicating with the interior of the inner bag. The opening and closing part is configured to open and close the discharge port. The opening and closing part has an easy-open forming part with a structure that facilitates the formation of an opening communicating with the interior of the inner bag.

[0040] [2] The double-layer container as described in [1], wherein the opening and closing component has an outer cylinder forming the outer peripheral surface of the opening and closing component, and the main body component has an exposed portion that is not covered by the lower end of the outer cylinder and is exposed to the outside.

[0041] [3] The double-layer container as described in [1] or [2], wherein the easy-opening forming part has a weakened part provided on the opening and closing member and a protrusion provided adjacent to the weakened part, and a cavity is provided on the lower side of the protrusion. The easy-opening forming part is configured such that when the protrusion is flipped down, the weakened part is torn apart, so that the cavity communicates with the outside, thereby forming the opening.

[0042] [4] The double-layer container as described in [1] or [2], wherein the easy-opening forming part has a weakened part provided on the opening and closing member and a protrusion provided adjacent to the weakened part, and a cavity is provided on the lower side of the protrusion. The easy-opening forming part is configured to tear the weakened part when the protrusion is pushed into the cavity, thereby forming the opening.

[0043] [5] The double-layer container as described in [1] or [2], wherein the easy-opening forming part has a pressing part provided on the opening and closing member, the pressing part has a cavity on its lower side, the pressing part is composed of a weakening part or is provided adjacent to the weakening part, the easy-opening forming part is configured such that the front end of the opening tool is pressed on the pressing part, thereby pushing the opening tool into the cavity, thereby tearing the weakening part to form the opening.

[0044] [6] The double-layer container as described in [1] or [2], wherein the easy-opening forming part has a cover provided on the opening and closing member, the cover being connected to the peripheral wall of the cavity provided on the lower side of the cover at a connecting part, the easy-opening forming part being configured such that by grasping and pulling up the gripping part provided on the cover, the connecting part is torn to expose the cavity, thereby forming the opening.

[0045] [7] A double-layer container has a container body and an opening mounting member installed at the opening of the container body. The container body has an inner bag and an outer shell arranged to cover the inner bag. If the direction of the central axis extending from the opening of the container body is taken as the axial direction, the opening mounting member has a main body and an opening and closing member. The main body engages with the inner bag in the axial direction and has a discharge port communicating with the inside of the inner bag. The opening and closing member is configured to open and close the discharge port. The opening and closing member has an outer cylinder forming the outer peripheral surface of the opening and closing member. The main body has an exposed portion that is not covered by the lower end of the outer cylinder and is exposed to the outside.

[0046] The effects of the invention (Part 1) In the container of the present invention, the circumferential engaging portion is positioned further from the opening end of the mouth than the axial engaging portion, and the engaging portion provided on the mouth mounting member is configured to engage with both the circumferential and axial engaging portions. In this structure, the engaging portion of the mouth mounting member engages with the circumferential engaging portion to form a rotation limiting structure. Since the engaging portion of the mouth mounting member is a component substantially present in all capped mouth mounting members, according to the present invention, a rotation limiting structure can be introduced while increasing the degree of freedom in selecting the mouth mounting member.

[0047] (Part 2) In the double-layer container of the present invention, since the engaging member engages with the protrusion of the inner bag in the circumferential direction, the inner bag can be rotated relative to the outer shell by gripping the engaging member and rotating it, thereby twisting the inner bag to reduce its diameter. Therefore, in the double-layer container of the present invention, no torque needs to be applied to the opening mounting member when twisting the inner bag, so the opening mounting member does not need to engage with the inner bag in the circumferential direction, increasing the freedom of choice in selecting the opening mounting member.

[0048] (Part 3) Because the largest circumference portion of the double-layered container of the present invention is located at a lower position in the container body, the body of the container body can gradually expand in diameter from the opening towards the largest circumference portion. If the body of the container body expands abruptly, the friction between the inner bag and the outer shell increases when the inner bag is pulled out, easily leading to a greater force required to pull out the inner bag. By gradually expanding the diameter of the container body towards the largest circumference portion, the force required to pull out the inner bag can be reduced. Furthermore, the container body of the double-layered container of the present invention has a flat shape at the largest circumference portion, making it easier to crush the container body to expel the contents. Therefore, according to the present invention, a double-layered container that reduces the force required to pull out the inner bag and has excellent contents discharge properties can be obtained.

[0049] (Aspect 4) In the double-layer container of the present invention, the opening and closing member provided on the mouth mounting member has an easy-opening forming part, which has a structure that facilitates the formation of an opening communicating with the interior of the inner bag. Therefore, it is easy to form an opening on the opening and closing member. After the opening is formed, when the inner bag is pulled out, the air inside the inner bag is discharged through the opening, so the inner bag is easy to pull out from the container body. Attached Figure Description

[0050] Figure 1 This is a perspective view of the container 11 according to the first embodiment of the present invention (first aspect). The dashed lines in the figure indicate boundary lines where the curvature of the surfaces constituting the surface shape changes. The same applies to the other figures.

[0051] Figure 2 for Figure 1 Exploded perspective view of container 11.

[0052] Figure 3A In the closed state of the opening and closing component 42, Figure 1 A longitudinal section view of container 11. Figure 3B for Figure 3A A magnified view of region B in the middle.

[0053] Figure 4 So that when the opening / closing component 42 is slightly open, Figure 3A The exploded diagram.

[0054] Figure 5 for Figure 4 A cross-sectional view of the main body 2 of the middle container.

[0055] Figure 6A for Figure 2 An exploded stereoscopic view of the area near the mouth 5. Figure 6B This is the front view of inner bag 4.

[0056] Figure 7A To observe from another perspective Figure 2 A perspective view of the main component 41 of the middle opening mounting component 8. Figure 7B To be Figure 7A A three-dimensional cross-sectional view of the main component 41 cut in half.

[0057] Figure 8 A perspective view showing the separated state of the inner preform 14 and the outer preform 13.

[0058] Figure 9A This is a perspective view of the preform 15 formed by covering the inner preform 14 with the outer preform 13. Figure 9B This is the front view of the preform 15.

[0059] Figure 10A This is a view of the side of the inner preform 14 viewed along the parting line PL. Figure 10B for Figure 10A End face view of the middle BB line. Figures 10C-10F for Figure 10B Enlarged view of the central region C~F.

[0060] Figure 11 A perspective view of a double-layered container 1 according to an embodiment of the present invention (second aspect).

[0061] Figure 12 for Figure 11 An exploded perspective view of the double-layered container 1.

[0062] Figure 13 for Figure 12 An exploded perspective view of the area near the opening 5 of the main body 2 of the container.

[0063] Figure 14 for Figure 11 A cross-sectional view of the double-layered container 1. Only a portion of the pump 9 is shown in the cross-sectional view; the remainder is the main view.

[0064] Figure 15 for Figure 14 An exploded view of the cross-section. Only a portion of pump 9 is shown.

[0065] Figure 16A A perspective view of the engaging component 45 viewed from a slightly lower angle. Figure 16B This is a bottom view of the engaging component 45. Figure 16C for Figure 14 End face view of the CC line.

[0066] Figure 17 In order to be from Figure 11 An enlarged view of the area near the opening 5 of the double-walled container 1 with the pump 9 removed and the top part 45e of the locking component 45 removed.

[0067] Figure 18 A perspective view showing the separated state of the inner preform 14 and the outer preform 13.

[0068] Figure 19 This is a perspective view of a preform 15 formed by covering an inner preform 14 with an outer preform 13.

[0069] Figure 20 A perspective view of a double-layered container 1 according to an embodiment of the present invention (third aspect).

[0070] Figure 21 for Figure 20 An exploded perspective view of the double-layered container 1.

[0071] Figure 22 for Figure 20 The front view of the main body of container 2.

[0072] Figure 23A and Figure 23B They are respectively Figure 20 Right side view and bottom view of the main body 2 of the container.

[0073] Figures 24A-24C They are respectively Figure 22 Section AA, section BB, and section CC.

[0074] Figure 25 This is a perspective view of the double-layered container 1 according to the first embodiment of the present invention (fourth aspect). The dashed lines in the figure represent boundary lines where the curvature of the surfaces constituting the surface shape changes. The same applies to the other figures.

[0075] Figure 26 for Figure 25 An exploded perspective view of the double-layered container 1.

[0076] Figure 27A In the closed state of the opening and closing component 42, Figure 25 A longitudinal section view of the double-layered container 1. Figure 27B for Figure 27A A magnified view of region B in the middle.

[0077] Figure 28 for Figure 27A The exploded diagram.

[0078] Figure 29A To observe from another perspective Figure 26 A perspective view of the opening and closing component 42 of the middle-mouth mounting component 8. Figure 29B for Figure 29A A magnified view of region B in the middle.

[0079] Figure 30A for Figure 29A A cross-sectional perspective view of the opening and closing component 42. Figure 30B for Figure 30A A magnified view of region B in the middle.

[0080] Figure 31A This is a cross-sectional view of the opening / closing member 42 in the state where the protrusion 8f is flipped down to form the opening 51. Figure 31B for Figure 31A A magnified view of region B in the middle.

[0081] Figure 32A This is a perspective view of the opening / closing component 42 according to the second embodiment of the present invention. Figure 32B for Figure 32A A magnified view of region B in the middle.

[0082] Figure 33A for Figure 32A A cross-sectional view of the opening and closing component 42. Figure 33B From Figure 33AThe state of the protrusion 8f is pushed into the cavity 53 to form the opening 51. This is a cross-sectional view.

[0083] Figure 34A This is a perspective view of the opening / closing component 42 according to the third embodiment of the present invention. Figure 34B for Figure 34A A magnified view of region B in the middle.

[0084] Figure 35A for Figure 34A A cross-sectional view of the opening and closing component 42. Figure 35B From Figure 35A The state of the opening tool 54 pushes the front end 54a into the cavity 53 to form the cross-sectional view of the opening 51.

[0085] Figure 36A for Figure 34A A cross-sectional view of a modified example of the opening and closing component 42. Figure 36B From Figure 36A The state of the opening tool 54 pushes the front end 54a into the cavity 53 to form the cross-sectional view of the opening 51.

[0086] Figure 37A This is a perspective view of the opening / closing component 42 according to the fourth embodiment of the present invention. Figure 37B for Figure 37A The front view of the opening and closing component 42.

[0087] Figure 38A To be Figure 37A A cross-sectional view of the cover portion 8j of the opening / closing component 42 with the portion removed. Figure 38B for Figure 38A Enlarged view of the middle cover 8j and the base 8m.

[0088] Figure 39A for Figure 37B Sectional view of AA in the middle. Figure 39B for Figure 39A Enlarged view of the 8m central base.

[0089] Figure 40A for Figure 37B A three-dimensional view of the BB cross section. Figure 40B for Figure 40A A magnified view of region B in the middle.

[0090] Figure 41A for Figure 39A Sectional view of AA in the middle. Figure 41B From Figure 41A A cross-sectional view of the state after the cover 8j is pulled up to form an opening 51.

[0091] Figure 42A This is a perspective view of the mouth mounting component 8 according to the fifth embodiment of the present invention. Figure 42B for Figure 42AA cross-sectional view of the mouth mounting component 8.

[0092] Figure 43A This is a perspective view of the opening / closing component 42 according to the sixth embodiment of the present invention. Figure 43B To observe from another perspective Figure 43A A perspective view of the opening and closing component 42.

[0093] Figure 44A For having Figure 43A A perspective view of the opening / closing component 42 and the mounting component 8 at its opening. Figure 44B for Figure 44A Cross-sectional view of mouth mounting component 8.

[0094] Figure 45A This is a perspective view of the opening / closing component 42 according to the seventh embodiment of the present invention. Figure 45B To observe from another perspective Figure 45A A perspective view of the opening and closing component 42.

[0095] Figure 46A For having Figure 45A A perspective view of the opening / closing component 42 and the mounting component 8 at its opening. Figure 46B for Figure 46A Cross-sectional view of mouth mounting component 8. Detailed Implementation

[0096] The embodiments of the present invention will now be described. The various features shown in the following embodiments can be combined with each other. An invention can be established independently for each feature. In the following embodiments, elements not defined in the claims are arbitrary elements and can therefore be omitted. Any number of zeros (e.g., one or two) can be added to the end of the numerical values ​​disclosed in the following description. For example, adding one or two zeros after "1.4" can result in "1.40" or "1.400".

[0097] (Part 1) 1. First Implementation Method Reference Figures 1-10F The container 11 according to the first embodiment of the present invention will be described below. In the following description, terms related to direction such as "up" and "down" refer to the direction in which the bottom 7 is grounded. Furthermore, in the following description, "axial direction" refers to the central axis C of the opening 5. Figure 2 The direction of extension (as shown) is, for example, the direction in which the inner bag 4 is pulled out of the container body 2. "Circumferential" refers to the direction of rotation about the central axis C of the opening 5, for example, the direction in which the inner bag 4 is rotated relative to the outer shell 3 at the opening 5. "Clockwise" and "counterclockwise," unless otherwise specified, are the directions viewed from above the container 11.

[0098] 1-1. Composition of container 11 like Figure 1 As shown, the container 11 of the first embodiment of the present invention includes a container body 2 and a mouth mounting component 8. In this embodiment, the container 11 is a double-layered container 1, and the container body 2 includes an inner bag 4 and an outer shell 3. However, the rotation limiting structure of this embodiment can also be applied to the case where the container 11 is a single-layered container. The structures are described in detail below.

[0099] <Basic Structure of Container Body 2> like Figures 2-3B As shown, the container body 2 has an opening 5, a body 6, and a bottom 7. The opening 5 is a cylindrical (preferably cylindrical) portion with an open end 5c. The open end 5c is both the open end of the container body 2 and the open end of the inner bag 4.

[0100] The body 6 is positioned on the side farther from the opening end 5c than the opening 5 and adjacent to the opening 5. The outer diameter of the body 6 (in this specification, if the cross-section is not circular, "outer diameter" refers to the equivalent circle diameter) is larger than that of the opening 5. The body 6 is cylindrical, and the bottom 7 is located at the lower end of the body 6, closing the lower end of the body 6. The body 6 has a shoulder 6b that increases in size with increasing distance from the opening 5. In addition, the body 6 has a body body 6c on the side closer to the bottom 7 than the shoulder 6b. The shape of the body body 6c is, for example, approximately constant in outer diameter toward the bottom 7, or tapered toward the bottom 7.

[0101] like Figures 3A to 6B As shown, the container body 2 includes an inner bag 4 and an outer shell 3 arranged to cover the inner bag 4. The inner bag body 4d, excluding the protrusion 4c, is housed within the outer shell 3. In the following description, the portions of the inner bag 4 corresponding to the opening 5, body 6, and bottom 7 of the container body 2 are referred to as the opening 5, body 6, and bottom 7 of the inner bag 4, respectively. The same applies to the outer shell 3.

[0102] <The engaging structure between the container body 2 and the mouth mounting component 8> The mouth mounting component 8 is a component installed at the mouth 5 of the container body 2. In this embodiment, the mouth mounting component 8 is a cap 8a, but it could also be other components such as a pump. The mouth mounting component 8 is configured to be installed at the mouth 5 in a pressure-cap manner. Figure 6A , Figure 6B As shown, the container body 2 has an axial engaging portion 4ma that engages axially with the mouth mounting member 8, and a circumferential engaging portion 4mb that engages circumferentially with the mouth mounting member 8. The circumferential engaging portion 4mb is located at a position farther from the opening end 5c of the mouth 5 than the axial engaging portion 4ma. Preferably, the container body 2 and the mouth mounting member 8 do not engage with each other at locations other than the axial engaging portion 4ma and the circumferential engaging portion 4mb.

[0103] The mouth-mounting component 8 includes an engaging portion 8b. The engaging portion 8b is preferably located on the inner circumferential surface of the outer cylinder 41a of the mouth-mounting component 8. The engaging portion 8b is preferably an annular protrusion 8b3. The engaging portion 8b engages axially with respect to the axial engaging portion 4ma and circumferentially with respect to the circumferential engaging portion 4mb. The circumferential engagement between the circumferential engaging portion 4mb and the engaging portion 8b can be a concave-convex engagement or a friction engagement. Since the engaging portion 8b is substantially located in all capped mouth-mounting components 8, according to the structure of the present invention, a rotational restriction structure between the mouth-mounting component 8 and the container body 2 can be achieved using capped mouth-mounting components 8 of substantially any structure, thereby making the selection of the mouth-mounting component 8 very free. Capped mouth-mounting components with dimensions and shapes conforming to the F-mouth specification are widely available and have excellent availability.

[0104] like Figure 6A , Figure 6B As shown, the axial engaging portion 4ma preferably has an annular protrusion 4c5, and the circumferential engaging portion 4mb preferably has a plurality of engaging protrusions 4c2 arranged at intervals along the circumference. The upper surface of the annular protrusion 4c5 is provided with a conical surface 4c8. Thus, when mounting the port mounting component 8, the engaging portion 8b can easily pass over the annular protrusion 4c5.

[0105] When the engaging part 8b passes over the axial engaging part 4ma and engages with the axial engaging part 4ma, it becomes Figure 3B In this state, the front end 8b4 of the engaging portion 8b is pressed against the circumferential engaging portion 4mb, and the engaging portion 8b and the circumferential engaging portion 4mb engage with each other through friction. Furthermore, for example, when the circumferential engaging portion 4mb is composed of multiple engaging protrusions 4c2, and each engaging protrusion 4c2 is conical, and the engaging portion 8b is more easily deformable than the engaging protrusions 4c2, when the engaging portion 8b is pressed against the engaging protrusions 4c2, the engaging protrusions 4c2 will embed into the engaging portion 8b, thereby causing the engaging portion 8b and the engaging protrusions 4c2 to engage in a circumferential concave-convex engagement. In one example, when the engaging portion 8b is made of polyethylene resin and the engaging protrusions 4c2 are made of polypropylene resin, since polypropylene resin is generally more rigid than polyethylene resin, the engaging protrusions 4c2 are more easily embedded into the engaging portion 8b.

[0106] <Detailed Structure of Outer Shell 3 and Inner Bag 4> like Figure 4 As shown, the inner bag 4 has a protrusion 4c that protrudes from the opening end 3a of the outer shell 3. Figures 5-6BAs shown, the inner bag 4 includes a first tube 4a and a second tube 4b. The first tube 4a is disposed inside the outer casing 3. The second tube 4b has a larger outer diameter than the first tube 4a and is disposed closer to the opening end 5c of the inner bag 4 than the first tube 4a. The second tube 4b may be entirely disposed outside the outer casing 3, or it may be partially or entirely disposed inside the outer casing 3 with the remaining portion disposed outside the outer casing 3. The protrusion 4c preferably protrudes axially.

[0107] like Figure 5 As shown, the second cylinder 4b includes a peripheral wall 4b1 and a lower wall 4b2 disposed below the peripheral wall 4b1 and configured to narrow towards the first cylinder 4a. The inner bag 4 is arranged such that the lower wall 4b2 abuts against the outer shell 3. By abutting the lower wall 4b2 against the outer shell 3, the entry of the inner bag 4 into the outer shell 3 can be prevented. The peripheral wall 4b1 preferably extends parallel to the axial direction. In addition, the angle α between the peripheral wall 4b1 and the lower wall 4b2 is preferably 90 degrees or more (90 degrees in this embodiment). In this case, the bending of the inner bag 4 at the corner 4b3 between the lower wall 4b2 and the peripheral wall 4b1 becomes relatively gentle, and it is not easy to break when subjected to impact, thus improving impact resistance. The length L1 between the lower surface 4b4 of the lower wall 4b2 and the lower surface 4m3 of the axial engagement portion 4ma is preferably 2 mm or more. In this case, local bending of the inner bag 4 is further suppressed. The length L1 is, for example, 2 to 10 mm, preferably 3 to 6 mm (4.5 mm in this embodiment). Specifically, the length L1 is, for example, 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, or 10.0 mm, or a range between any two values ​​mentioned here. The peripheral wall 4b1 preferably has a portion parallel to the axial direction. The length of this axially parallel portion from the lower surface 4b4 is preferably within the aforementioned range. Furthermore, the peripheral wall 4b1 is preferably parallel to the axial direction between the lower surface 4b4 and the lower surface 4m3, and more preferably parallel to the axial direction throughout the entire interval between the lower surface 4b4 and the lower surface 4m3.

[0108] The opening end 3a of the outer casing 3 is provided with a base surface 3a1, an annular protrusion 3a2, and an inner bag support surface 3a3. The base surface 3a1 is preferably annular. The annular protrusion 3a2 is disposed inside the base surface 3a1 and protrudes axially from the base surface 3a1. Preferably, as shown... Figures 3A-4As shown, the base surface 3a1 faces the opening end 41a1 of the outer cylinder 41a of the mouth mounting member 8, and the annular protrusion 3a2 protrudes inward towards the inner side of the outer cylinder 41a of the mouth mounting member 8. With this structure, even if the contents of the inner bag 4 enter the gap 44 between the base surface 3a1 and the opening end 41a1, the contents will be blocked by the annular protrusion 3a2, preventing them from intruding between the inner bag 4 and the outer shell 3. Furthermore, the apex 3a4 of the annular protrusion 3a2 is preferably located at a higher position than the opening end 41a1. In this case, the intrusion of contents can be further suppressed.

[0109] The inner bag support surface 3a3 is the surface that the lower wall 4b2 abuts against. The inner bag support surface 3a3 is preferably annular. By having the lower wall 4b2 abut against the inner bag support surface 3a3, the inner bag 4 is supported by the outer shell 3, thereby preventing the inner bag 4 from entering the outer shell 3. The inner bag support surface 3a3 is disposed inside the base surface 3a1 and the annular protrusion 3a2. The inner bag support surface 3a3 is preferably positioned below the base surface 3a1. In this case, a portion of the peripheral wall 4b1 near the lower wall 4b2 is covered by the outer shell 3, and consequently, the lower wall 4b2 and the corner portion 4b3 are also covered by the outer shell 3. Thus, the corner portion 4b3, which has relatively low impact resistance, is protected by the outer shell 3, further improving the impact resistance of the inner bag 4.

[0110] like Figure 4 and Figure 6A , Figure 6B As shown, the inner bag 4 has an axial engaging portion 4ma and a circumferential engaging portion 4mb on the protrusion 4c that protrudes from the opening end 3a of the outer shell 3. Figure 5 and Figure 6A , Figure 6B As shown, the axial engaging portion 4ma and the circumferential engaging portion 4mb are configured to protrude radially outward from the circumferential wall 4b1. Figure 5 As shown, a recess 4c13 is provided on the inner circumferential surface of the axial engaging portion 4ma. Preferably, the opening mounting component 8 is not engaged with the housing 3.

[0111] like Figure 5 As shown, in the axial direction, the length L2 between the opening end 5c of the inner bag 4 and the lower surface 4m3 of the axial engaging portion 4ma is preferably 4.0~5.0 mm. The F-type opening specification specifies a length L2 of 4.5 mm. By setting the length L2 within the above range, an opening mounting component 8 conforming to the F-type opening specification can be used. Various commercially available opening mounting components 8 conforming to the F-type opening specification are readily available. Specifically, the length L2 can be, for example, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, or 5.0 mm, or a range between any two values ​​mentioned here.

[0112] The inner bag 4 has an inclined portion 4e and a sealing tube portion 4f on the side closer to the opening end 5c than the lower surface 4m3. For example... Figures 3A-4 As shown, the inner surface of the sealing cylinder portion 4f is tightly fitted to the outer peripheral surface 41b1 of the inner cylinder 41b provided on the opening mounting member 8. This suppresses leakage of the contents inside the inner bag 4. The inclined portion 4e is configured to reduce the diameter of the axially engaging portion 4ma toward the sealing cylinder portion 4f. Figure 5 As shown, the length L3 between the lower end of the axial sealing cylinder portion 4f and the lower surface 4m3 of the axial engaging portion 4ma is preferably 1.2 to 4.0 mm. By making the length L3 within this range, it is easy to make the length L2 within the above range. Specifically, the length L3 is, for example, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, or 4.0 mm, or it can be a range between any two values ​​mentioned here.

[0113] The opening end 5c of the inner bag 4 is provided with an enlarged diameter portion 4o, thereby allowing the inner tube 41b to be easily inserted into the inner bag 4.

[0114] Regarding the axial direction, the length L4 between the open end 5c and the lower end of the sealing cylinder 4f, and the length L5 of the sealing cylinder 4f, are preferably 0.5 to 3.3 mm, respectively. By making lengths L4 and L5 within this range, it is easy to make lengths L2 and L3 within the same range. Specifically, lengths L4 and L5 are, for example, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, and 3.3 mm, or any range between any two values ​​mentioned here.

[0115] The protruding length L6 of the axial engaging portion 4ma, measured from the peripheral wall 4b1, is preferably 0.60 to 1.85 mm. In this case, it is advantageous to easily make L2 to L4 fall within the above-mentioned range. Specifically, the protruding length L6 can be, for example, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 1.05, 1.10, 1.15, 1.20, 1.25, 1.30, 1.35, 1.40, 1.45, 1.50, 1.55, 1.60, 1.65, 1.70, 1.75, 1.80, or 1.85 mm, or it can be a range between any two values ​​mentioned here.

[0116] From the viewpoint of satisfying the F-type specification, it is preferable to satisfy at least one of the following dimensions.

[0117] • The outer diameter of the axial engaging portion 4ma is 30.5~33.8mm (preferably 31.8~33.3mm, more preferably 32.3~33.3mm. In this embodiment, it is 32.8mm). • The outer diameter of the opening end 5c of the inner bag 4 is 29.0~31.0 mm (preferably 29.5~30.5 mm. In this embodiment, it is 30.0 mm). • The diameter of the outer circumferential surface of the sealing cylinder 4f is 28.1~30.1 mm (preferably 28.6~29.6 mm. In this embodiment, it is 29.1 mm). like Figure 6A , Figure 6B As shown, a raised strip 4g is provided on the outer peripheral surface of the inner bag 4 (more specifically, the inner bag body 4d). The lower surface of the raised strip 4g is inclined towards the opening end 5c as it moves counterclockwise.

[0118] The outer circumferential surface of the inner bag 4 is provided with a plurality of raised strips 4g, the starting points and ending points of which are staggered in the circumferential direction. In this embodiment, two raised strips 4g are arranged 180 degrees apart in the circumferential direction. Furthermore, the extension angle of each raised strip 4g is preferably 180 degrees or less, more preferably 90 degrees or less. This angle is, for example, 15 to 180 degrees, preferably 30 to 90 degrees (approximately 45 degrees in this embodiment). Specifically, this angle is, for example, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 155, 160, 165, 170, 175, or 180 degrees, or may be a range between any two values ​​mentioned herein.

[0119] A cam guide rail 3l is provided on the inner circumferential surface of the outer casing 3. A portion of the cam guide rail 3l has a concave strip 3m that can engage with the protruding strip 4g. The concave strip 3m is preferably located at the end of the cam guide rail 3l. The upper surface of the cam guide rail 3l is inclined towards the opening end 3a as it advances counterclockwise. The protruding strip 4g and the concave strip 3m are configured such that they can engage by rotating the inner bag 4 clockwise relative to the outer casing 3, and can disengage by rotating the inner bag 4 counterclockwise relative to the outer casing 3. The concave strip 3m is formed by a non-through hole. In this case, compared with the case where the concave strip 3m is formed by a through hole, the outer casing 3 is less prone to breakage.

[0120] The inner circumferential surface of the outer casing 3 is provided with a plurality of cam guide rails 3l, the starting points and ending points of the plurality of cam guide rails 3l being staggered from each other in the circumferential direction. In this embodiment, two cam guide rails 3l are arranged staggered by 180 degrees in the circumferential direction. In addition, the extension angle of each cam guide rail 3l is preferably 360 degrees or less, more preferably 270 degrees or less. This angle is, for example, 90 to 360 degrees, preferably 120 to 240 degrees (180 degrees in this embodiment). Specifically, this angle is, for example, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350, 360 degrees, or any range between any two values ​​mentioned herein.

[0121] The concave strip 3m is preferably disposed on each cam guide rail 3l. The angle of extension of the concave strip 3m is described in the same way as the angle of the convex strip 4g described above.

[0122] The container body 2 preferably has a rotation limiting structure that restricts the relative rotation of the inner bag 4 and the outer shell 3. Examples of such rotation limiting structures include structures that increase the friction between the inner bag 4 and the outer shell 3, or structures that cause the inner bag 4 and the outer shell 3 to engage in a circumferential manner.

[0123] Before the inner bag 4 is pulled out of the container body 2, the lower surface of the convex rib 4g abuts against the upper surface of the cam guide rail 3l within the concave rib 3m. The convex rib 4g and the cam guide rail 3l constitute a cam mechanism 31. When the inner bag 4 is rotated counterclockwise relative to the outer shell 3, the inner bag 4 is displaced in the direction of being dislodged from the container body 2 due to the action of the cam mechanism 31. At this time, the inner bag 4 is twisted and its diameter is reduced. The cam mechanism 31 has an inclined structure in the same direction as the right-hand thread.

[0124] like Figures 5-6B As shown, on the outer peripheral surface of the outer casing 3, first and second flange portions 3f1 and 3f2 are sequentially provided from the opening end 3a side of the outer casing 3. The cam mechanism 31 is preferably configured such that its lower end is located closer to the opening end 3a than the lower surface 3f3 (preferably the central surface 3f4, more preferably the upper surface 3f5) of the second flange portion 3f2. The container body 2 is constructed by... Figures 8-10FThe preform 15 shown is formed by biaxial stretch blow molding. The second flange portion 13f2 and cam mechanism 15g of the preform 15 become the second flange portion 3f2 and cam mechanism 31 of the container body 2 after molding. The cam mechanism 15g is composed of the protrusion 14g of the inner preform 14 and the cam guide 13l of the outer preform 13. In the preform 15, since the side closer to the bottom 15c than the lower surface 13f3 of the second flange portion 13f2 is heated and mainly stretched, by positioning the cam mechanism 15g closer to the opening end 13d of the outer preform 13 than the lower surface 13f3 of the second flange portion 13f2, it is possible to suppress the deformation of the shape of the cam mechanism 15g provided on the preform 15 during molding. For the concave strip 3m and the convex strip 4g, and the parts corresponding to the concave strip 3m and the convex strip 4g in the preform 15, it is also preferable to arrange them closer to the opening ends 3a and 13d than the lower surfaces 3f3 and 13f3 of the second flange parts 3f2 and 13f2.

[0125] like Figure 5 As shown, the first flange 3f1 is constructed by expanding the diameter of the opening end 3a. The inner circumferential surface of the first flange 3f1 preferably has a recess 3g. The lower surface of the recess 3g forms the inner bag support surface 3a3. In the F-type cover specification, the axial length from the opening end 5c of the container body 2 to the lower surface of the support ring supporting the opening 5 when the opening mounting component 8 is installed is specified as 10.2 mm. Therefore, if an attempt is made to conform to the F-type cover specification using a flange on the outer shell 3, the flange needs to be positioned at or adjacent to the opening end 3a, as in the first flange 3f1. This would cause the cam mechanism 15g mounted on the preform 15 to be easily heated during molding, making it prone to deformation. On the other hand, in this embodiment, the presence of the first and second flanges 3f1 and 3f2 suppresses deformation of the cam mechanism 15g mounted on the preform 15 during molding. The first flange 3f1 is provided as a support ring, and the first flange 3f1 preferably does not engage with the port mounting component 8.

[0126] Regarding the axial direction, the length L7 between the lower surfaces of the first and second flange portions 3f1 and 3f2 is, for example, 3 to 9 mm, preferably 4.5 to 7.5 mm (6 mm in this embodiment). Specifically, the length L7 is, for example, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, or 9.0 mm, or it can be a range between any two values ​​mentioned here.

[0127] <Detailed Structure of Mouth Mounting Component 8> like Figure 4As shown, the mouth mounting component 8 preferably has a discharge port 8d for discharging the contents of the inner bag 4. Additionally, the mouth mounting component 8 preferably includes a nozzle 8c.

[0128] The mouth-mounting component 8 preferably includes a main body component 41 and an opening / closing component 42. When the mouth-mounting component 8 is a cover 8a, the main body component 41 is the cover body, and the opening / closing component 42 is the outer cover. The main body component 41 is configured to engage with the protrusion 4c and has a discharge port 8d. The opening / closing component 42 is configured to open and close the discharge port 8d. Figure 3A , Figure 3B The closed state of outlet 8d is shown. Figure 4 The diagram shows the open state of the outlet 8d. In this embodiment, the main body component 41 and the opening / closing component 42 are connected by a hinge 43, but they may not be connected. The opening / closing component 42 is preferably engaged with the main body component 41 by a thread or a snap-fit.

[0129] The main component 41 includes an outer cylinder 41a, an inner cylinder 41b, a nozzle 8c, 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 8c is disposed above the upper wall 41d. A flow hole 41i is provided on the upper wall 41d, through which the flow path of the inner cylinder 41b and the nozzle 8c communicates. The front end of the nozzle 8c becomes the outlet 8d. The inner cylinder 41b is inserted into the protrusion 4c and fits tightly against the inner surface 4f1 of the sealing cylinder portion 4f. Therefore, the inner cylinder 41b and the sealing cylinder portion 4f are engaged in circumferential friction. An engaging portion 8b is provided on the inner circumferential surface of the outer cylinder 41a.

[0130] The opening and closing component 42 includes an outer cylinder 42a, an inner cylinder 42b, and an upper wall 42d. The inner cylinder 42b is disposed inside the outer cylinder 42a. The outer cylinder 42a and the inner cylinder 42b are connected via the upper wall 42d. The upper wall 42d does not have a discharge port for discharging the contents of the inner bag 4.

[0131] With the outlet 8d closed by the opening / closing member 42, the inner cylinder 42b is inserted into the nozzle 8c of the main body member 41 and closely adheres to the inner surface of the nozzle 8c. Meanwhile, the bottom surface of the outer cylinder 42a abuts against the upper wall 41d of the main body member 41. In this state, by grasping the outer cylinder 42a and applying an upward force to the opening / closing member 42, the opening / closing member 42 can be separated from the main body member 41, thus opening the outlet 8d.

[0132] <Installation of Mouth Mounting Component 8> like Figures 3A-4As shown, the mouth mounting component 8 can be installed in the mouth 5 while supporting the first flange portion 3f1. The mouth mounting component 8 is preferably a pressure cap type. With the first flange portion 3f1 supported, the mouth mounting component 8 is placed over the protrusion 4c, and a downward force is applied to the mouth mounting component 8 in this state, so that the engaging portion 8b passes over the axial engaging portion 4ma, and the engaging portion 8b engages with the axial engaging portion 4ma and the circumferential engaging portion 4mb, thereby installing the mouth mounting component 8 in the mouth 5.

[0133] <Removing Inner Bag 4> The opening mounting member 8 engages with the opening 5 of the inner bag 4 in both the circumferential and axial directions, such that the inner bag 4 rotates relative to the outer casing 3 at the opening 5 as the opening mounting member 8 rotates. Furthermore, through the action of the cam mechanism 31 provided between the inner bag 4 and the outer casing 3, the inner bag 4 moves in a direction that allows it to disengage from the container body 2 as it rotates. Additionally, since the inner bag 4 is less likely to rotate relative to the outer casing 3 at the body 6 and bottom 7 compared to the opening 5, the inner bag 4 is twisted when the opening 5 rotates relative to the outer casing 3.

[0134] According to this structure, by rotating the opening mounting component 8, the inner bag 4 can be twisted and moved in the direction of being dislodged from the container body 2. Then, by pulling the opening mounting component 8, the inner bag 4 can be pulled out from the container body 2.

[0135] 1-2. Method for manufacturing container 11 Container body 2 can be accessed via Figure 9A , Figure 9B The preform 15 shown is manufactured by biaxial stretch blow molding. Additionally, the container 11 can be manufactured by mounting the mouth mounting component 8 onto the container body 2.

[0136] <Composition of inner preform 14, outer preform 13, and preform 15> like Figure 8 As shown, the preform 15 includes an inner preform 14 that becomes an inner bag 4 and an outer preform 13 that becomes an outer shell 3.

[0137] like Figure 8 As shown, the inner preform 14 is a bottomed cylindrical shape, having an opening 14a, a body 14b, and a bottom 14c. The bottom 14c is positioned to close the lower end of the body 14b. The outer preform 13 is also a bottomed cylindrical shape, having an opening 13a, a body 13b, and a bottom 13c. The bottom 13c is positioned to close the lower end of the body 13b.

[0138] like Figure 9A , Figure 9BAs shown, a preform 15 can be formed by covering the inner preform 14 with the outer preform 13. In the preform 15, the opening 14a is opposite to the opening 13a, and the body 14b is opposite to the body 13b.

[0139] The openings 13a and 14a become the opening 15a of the preform 15, the body 13b and 14b become the body 15b of the preform 15, and the bottom 13c and 14c become the bottom 15c of the preform 15. The body 15b and the bottom 15c are primarily stretched during biaxial stretch blow molding. The opening 15a does not deform significantly during molding and becomes the opening 5 of the container body 2. The above description of the components included in the opening 5 can also be applied to the components included in the opening 15a without departing from its purpose.

[0140] <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 thermoplastic resins such as polyester (e.g., PET) or polyolefin (e.g., polypropylene, polyethylene).

[0141] 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 preform. When the inner preform 14 is formed by direct blow molding, a structure in which a recess 4c13 is formed on the inner circumferential surface of the axially engaging portion 4ma can be obtained. The inner preform 14 is preferably a multi-layered structure.

[0142] In one example, the inner preform 14 can be formed by using... Figure 10B The parting line PL shown is formed by direct blow molding using a split mold that opens to the left and right. The inner preform 14 is provided with an engaging protrusion 14c2 that serves as an engaging protrusion 4c2. For example... Figure 10B As shown, the inner preform 14 has eight engaging protrusions 14c2. These are located... Figure 10B The four engaging protrusions 14c2 (14c21, 14c22, 14c23, 14c24) at positions C~F in the middle region have Figures 10C-10F The shape shown. Figure 10B The remaining four engaging protrusions 14c2 have a shape that is symmetrical to engaging protrusions 14c21, 14c22, 14c23, and 14c24. Engaging protrusions 14c21, 14c22, 14c23, and 14c24 are respectively shaped to prevent undercutting when the split mold is opened to the left or right. Therefore, when the inner preform 14 is removed from the split mold, shape deformation of engaging protrusions 14c21, 14c22, 14c23, and 14c24 can be suppressed.

[0143] 2. Other implementation methods • Unlike the above embodiment, the relative rotation directions of the components can also be opposite. In the above embodiment, the inner bag 4 is displaced from the container body 2 by rotation in the loosening direction of the right-hand thread, but it can also be configured to displace the inner bag 4 from the container body 2 by rotation in the loosening direction of the left-hand thread.

[0144] (Part 2) 1. The structure of the double-layer container 1 Reference Figures 11-19 The second aspect of the present invention will now be described, specifically a double-layered container 1 according to an embodiment. The matters described in the first aspect are applicable to this aspect without departing from its spirit, and the matters described in this aspect are applicable to the first aspect without departing from its spirit. Hereinafter, the description will focus on the differences from the first aspect.

[0145] <Overall Composition> like Figures 11-12 As shown, the double-layer container 1 of this embodiment includes a container body 2, a mouth mounting member 8 (in this embodiment, a pump 9), a locking member 45, and a sealing member 46. The container body 2 is configured such that, when the inner bag 4 is rotated relative to the outer shell 3 in one direction when viewed from above the double-layer container 1, the inner bag 4 displaces in the direction of disengagement from the container body 2. The mouth mounting member 8 and the protrusion 4c are configured to be threadedly engaged such that rotation of the mouth mounting member 8 relative to the protrusion 4c in the aforementioned direction is a loosening direction for threaded engagement. In this embodiment, the aforementioned direction is a counter-clockwise direction when viewed from above the double-layer container 1. Hereinafter, "clockwise" and "counter-clockwise" refer to the directions when viewed from above the double-layer container 1 unless otherwise specified. The various components will be described in detail below.

[0146] <Basic Structure of Container Body 2> like Figure 12 As shown, the container body 2 includes a mouth 5, a body 6, and a bottom 7. The mouth 5 is provided with a flange 5b. The flange 5b is used to support the mouth 5 when the mouth mounting component 8 is installed. The body 6 is located on the side farther from the opening end 5c than the mouth 5 and is adjacent to the mouth 5. In one example, the body 6 is located further down than the flange 5b.

[0147] In this embodiment, the double-layered container 1 can be configured such that the inner bag 4 contracts as the contents are discharged. In this case, the opening mounting member 8 is provided with a check valve that allows the contents to be discharged while preventing external air from entering the inner bag 4. Additionally, in this case, the container body 2 is provided with an external air inlet for introducing external air into the space between the outer shell 3 and the inner bag 4.

[0148] <Detailed Composition of Outer Shell 3 and Inner Bag 4> like Figure 13 As shown, the inner bag 4 has a protrusion 4c that protrudes from the opening end 3a of the outer shell 3. The protrusion 4c has a protruding cylinder 4c1, an external threaded portion 4c9, and a concave-convex portion 4i. The concave-convex portion 4i is positioned further from the opening end 5c than the external threaded portion 4c9. The concave-convex portion 4i is constructed by alternating concave portions 4i1 and convex portions 4i2 in the circumferential direction. In this embodiment, 12 concave portions 4i1 and 12 convex portions 4i2 are alternately arranged in the circumferential direction.

[0149] The inner bag 4 is provided with a flange 4c10. The flange 4c10 is configured to protrude radially. The flange 4c10 is preferably provided around the entire circumference. A raised face 4i is provided between the flange 4c10 and the external threaded portion 4c9. The flange 4c10 and the raised face 4i are arranged adjacent to each other.

[0150] like Figures 14-15 As shown, the lower surface 4c11 of the flange 4c10 abuts against the housing 3. The lower surface 4c11 abuts against the inner bag support surface 3a3 provided on the housing 3. The lower surface 4c11 of the flange 4c10 is supported by the inner bag support surface 3a3, thereby preventing the inner bag 4 from falling into the housing 3. The inner bag support surface 3a3 can be flush with the base surface 3a1 of the open end 3a, or it can be located above or below the base surface 3a1. In this embodiment, the inner bag support surface 3a3 is located below the base surface 3a1. Therefore, a portion of the flange 4c10 is disposed inside the housing 3, and the remainder is disposed outside the housing 3. Alternatively, the flange 4c10 can be entirely disposed inside the housing 3, or it can be entirely disposed outside the housing 3. When the inner bag 4 is directly blow-molded, the strength of the flange 4c10 is prone to decrease, and the flange 4c10 is easily damaged when it falls. However, by disposing at least a portion of the flange 4c10 inside the housing 3, damage to the flange 4c10 can be prevented. In one example, flange 4C10 is hollow.

[0151] <Detailed Composition of Engaging Component 45> like Figures 12-17As shown, the engaging member 45 is a member that engages with the protrusion 4c in the circumferential direction. The engaging member 45 can be annular or non-annular. When the engaging member 45 is annular, it can be circular or non-circular when viewed from above (i.e., viewed axially from above the double-layer container 1). Furthermore, the engaging member 45 only needs to engage with the protrusion 4c in the circumferential direction to a degree that allows it to rotate integrally with the protrusion 4c; it does not need to cover the entire circumference of the protrusion 4c, but only needs to cover at least a portion of the circumference of the protrusion 4c. The angle at which the engaging component 45 covers the protrusion 4c is, for example, 180 to 360 degrees, specifically, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350, or 360 degrees, or any range between any two values ​​mentioned here.

[0152] In this embodiment, the engaging member 45 is an annular member having an opening 45a. The protrusion 4c is disposed within the opening 45a. That is, the engaging member 45 is disposed around the protrusion 4c. Figures 16A-17 As shown, the peripheral surface 45b of the opening 45a is provided with a concave-convex portion 45c. The concave-convex portion 45c is formed by alternating concave portions 45c1 and convex portions 45c2 in the circumferential direction. In this embodiment, 12 concave portions 45c1 and 12 convex portions 45c2 are alternately arranged in the circumferential direction.

[0153] like Figure 14 , Figure 16C and Figure 17 As shown, with the engaging member 45 installed on the protrusion 4c, the protrusions 45c2 provided on the engaging member 45 are positioned between adjacent protrusions 4i2 provided on the protrusion 4c. Therefore, the protrusions 4i and 45c constitute a circumferential engaging portion 47 that engages the engaging member 45 with the protrusion 4c in the circumferential direction. In the circumferential engaging portion 47, the circumferential surface 45b of the opening 45a engages circumferentially with the outer circumferential surface 4c12 of the protrusion 4c. In this embodiment, the engaging member 45 and the protrusion 4c engage in a circumferential concave-convex engagement. The circumferential engaging portion 47 is positioned further from the opening end 5c than the external thread portion 4c9. Furthermore, the circumferential engaging portion 47 is positioned between the external thread portion 4c9 and the flange 4c10.

[0154] In the circumferential engagement portion 47, the engagement member 45 and the protrusion 4c engage circumferentially as follows: when the engagement member 45 is rotated counterclockwise relative to the outer casing 3, the inner bag 4 rotates relative to the outer casing 3 before the engagement member 45 rotates relative to the protrusion 4c. The engagement at the circumferential engagement portion 47 can be a concave-convex engagement or a friction engagement. Let the torque required to rotate the inner bag 4 counterclockwise relative to the outer casing 3 be T1, and the torque required to rotate the engagement member 45 counterclockwise relative to the protrusion 4c be T2, then T2 / T1 is greater than 1, preferably 1.2 or more, more preferably 2 or more. This value is, for example, 1.2, 1.5, 2, 5, 10, 100, or a range between any two values ​​mentioned herein or greater.

[0155] like Figure 12 and Figure 15 As shown, the engaging member 45 includes a cylindrical portion 45d and a top portion 45e provided on the top surface of the cylindrical portion 45d. An opening 45a is provided on the top portion 45e. Figures 14-15 As shown, the upper surface 4c14 of flange 4c10 abuts against the top surface 45e. The cylindrical portion 45d is configured to surround the housing 3. This structure allows the engaging member 45 to rotate more easily and stably. The open end 45h of the cylindrical portion 45d faces the flange 5b. The outer peripheral surface 45d1 of the cylindrical portion 45d is flush with the outer peripheral surface 5b1 of the flange 5b.

[0156] <Mouth mounting component 8 and sealing component 46> like Figure 12 As shown, the mouth mounting component 8 is a component installed at the mouth 5 of the container body 2. For example... Figures 14-15 As shown, the mouth mounting member 8 has an internal thread portion 8b1 that can be threadedly engaged with the external thread portion 4c9. By threading the external thread portion 4c9 with the internal thread portion 8b1, the mouth mounting member 8 is mounted on the protrusion 4c provided at the mouth 5 of the inner bag 4. The sealing member 46 is a component used to improve the tightness between the container body 2 and the mouth mounting member 8, thereby preventing leakage of the contents of the container body 2. The sealing member 46 is preferably made of an elastic component such as rubber. The sealing member 46 has an opening portion 46a for the flow of contents. The sealing member 46 is disposed on the opening end 5c. In this embodiment, the mouth mounting member 8 is a pump 9, but it can also be other components such as a cap. The sealing member 46 can be omitted when it is not needed.

[0157] Preferably, when the opening mounting member 8 is rotated counterclockwise relative to the outer casing 3, the opening mounting member 8 and the protrusion 4c rotate circumferentially relative to each other before the inner bag 4 rotates relative to the outer casing 3. In this case, since the opening mounting member 8 may rotate relative to the protrusion 4c before the inner bag 4 rotates relative to the outer casing 3, the significance of applying the present invention is particularly significant. Let the torque required to rotate the inner bag 4 counterclockwise relative to the outer casing 3 be T1, and the torque required to rotate the opening mounting member 8 counterclockwise relative to the protrusion 4c be T3, then T3 / T1 is less than 1, preferably 0.9 or less, more preferably 0.8 or less. This value is, for example, 0.1 to 0.99, specifically, for example, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, 0.99, or it can be a range between any two values ​​mentioned herein.

[0158] Pump 9 is configured to draw in and discharge the contents of container body 2 (more specifically, inner bag 4). For example... Figure 12 and Figures 14-15 As shown, in one example, the pump 9 includes a cylinder 9a, a nozzle 9b, a piston 9c, a pump mechanism 9d, and a conduit 9e. The pump 9 can actuate the pump mechanism within the pump mechanism 9d by sliding the piston 9c, thereby discharging the contents sucked up through the conduit 9e from the nozzle 9b, which communicates with the piston 9c. The conduit 9e can be omitted if it is not needed. The nozzle 9b is provided on the pressing head 9f, and the piston 9c slides as the pressing head 9f is pressed and released.

[0159] like Figure 14 As shown, the cylindrical portion 9a includes a threaded cylindrical portion 9a1, a top portion 9a2, and a sliding cylindrical portion 9a3. The top portion 9a2 is provided on the top surface of the threaded cylindrical portion 9a1. The sliding cylindrical portion 9a3 is provided on the top portion 9a2. The threaded cylindrical portion 9a1 and the sliding cylindrical portion 9a3 are interconnected and preferably arranged in a concentric circle. An internal thread portion 8b1 is provided on the inner circumferential surface of the threaded cylindrical portion 9a1. The lower end 9a4 of the cylindrical portion 9a is opposite to the top portion 45e. That is, the top portion 45e is disposed between the flange 4c10 and the cylindrical portion 9a. In this embodiment, a gap is left between the upper surface 45g of the top portion 45e and the lower end 9a4, but it can also be configured without this gap, and the top portion 45e can also be clamped and fixed by the flange 4c10 and the cylindrical portion 9a. Alternatively, the top part 45e can be fixed by providing a protrusion on the inner bag 4 that abuts against the upper surface 45g of the top part 45e, and positioning the top part 45e between the flange 4c10 and the protrusion. In this case, the engaging member 45 can be installed over the protrusion of the inner bag 4.

[0160] A flange 9g is provided on the outer peripheral surface of the pump mechanism 9d. The flange 9g is positioned between the top portion 9a2 and the open end 5c. Furthermore, a sealing member 46 is preferably positioned between the flange 9g and the open end 5c. With this structure, the cylindrical portion 9a is rotated clockwise relative to the protrusion 4c to tighten it, thereby clamping the flange 9g (and the sealing member 46) between the top portion 9a2 and the open end 5c to form a sealing structure and prevent leakage of contents.

[0161] The pressing head 9f has a cylindrical part 9f1. When a downward force is applied to the pressing head 9f, the pressing head 9f moves downward while the sliding cylindrical part 9a3 enters the cylindrical part 9f1. At this time, the pressing head 9f presses down the piston part 9c, causing the pump mechanism in the pump mechanism part 9d to operate.

[0162] 2. Manufacturing of the double-layer container 1 and removal of the inner bag 4 The double-layered container 1 of this embodiment can be manufactured by installing a locking component 45 and a mouth mounting component 8 after filling the container body 2 with contents.

[0163] The engaging member 45 engages circumferentially with the protrusion 4c of the inner bag 4, such that the inner bag 4 rotates relative to the outer shell 3 as the engaging member 45 rotates. Furthermore, by rotating the inner bag 4 relative to the outer shell 3, it can be twisted to reduce its diameter. Additionally, through the action of the cam mechanism 31 provided between the inner bag 4 and the outer shell 3, the inner bag 4 moves in a direction that allows it to disengage from the container body 2 as it rotates. Therefore, by rotating the engaging member 45, the inner bag 4 can be twisted to reduce its diameter while moving in a direction that allows it to disengage from the container body 2.

[0164] Furthermore, the opening mounting member 8 engages axially with the protrusion 4c via a threaded connection. Additionally, when the circumferential engaging portion 47 is positioned further from the opening end 5c than the external threaded portion 4c9, if the engaging member 45 is pulled axially to attempt to remove the inner bag 4, the engaging member 45 will abut against the opening mounting member 8. Therefore, the engaging member 45 engages axially with the protrusion 4c via the opening mounting member 8. With this structure, the inner bag 4 can be pulled out of the container body 2 by grasping the opening mounting member 8 and / or the engaging member 45 and pulling axially.

[0165] As described above, in the double-layer container 1 of this embodiment, since it is not necessary to apply torque to the mouth mounting member 8 when pulling out the inner bag 4, a screw-on type mouth mounting member 8 can be used.

[0166] After the inner bag 4 is removed, the opening mounting member 8 and the inner bag 4 can be separated by rotating the opening mounting member 8 relative to the inner bag 4 in the loosening direction of the threaded connection. Furthermore, after separating the opening mounting member 8, the locking member 45 and the inner bag 4 can be separated by moving the locking member 45 axially relative to the inner bag 4. In this way, the double-layer container 1 of this embodiment is configured such that the multiple components constituting the double-layer container 1 can be easily separated, thus exhibiting excellent recyclability. After separation, the inner bag 4 and the outer shell 3 can be recycled separately. As for the other components, they can be recycled or reused. For example, by purchasing a container body 2 filled with contents and installing the locking member 45, the sealing member 46, and the opening mounting member 8 on it, the double-layer container 1 filled with contents can be recycled. By allowing the container body 2 filled with contents to circulate without the locking member 45 installed, it is possible to prevent the locking member 45 from rotating on its own during circulation.

[0167] 3. Manufacturing method of the container body 2 of the double-walled container 1 Container body 2 can be accessed via Figure 19 The preform 15 shown is manufactured by biaxial stretch blow molding. This is achieved by covering the outer preform 13 with... Figure 18 A preform 15 can be formed on the inner preform 14 shown.

[0168] 4. Other implementation methods • Unlike the above embodiment, the relative rotation directions of the components can also be opposite. In the above embodiment, the inner bag 4 is displaced from the container body 2 by rotating in the loosening direction of the right-hand thread, and the threaded engagement between the opening mounting member 8 and the protrusion 4c is released. However, it can also be configured so that the inner bag 4 is displaced from the container body 2 by rotating in the loosening direction of the left-hand thread, and the threaded engagement between the opening mounting member 8 and the protrusion 4c is released. In this case, the "one direction" mentioned in the above embodiment becomes a clockwise direction, and "counterclockwise" in the above embodiment description is replaced with "clockwise".

[0169] • The cam mechanism 31 can be omitted. When the cam mechanism 31 is omitted, even if the inner bag 4 is rotated relative to the outer shell 3, the inner bag 4 will not be displaced in the direction of being removed from the container body 2. However, by rotating the inner bag 4 relative to the outer shell 3, the inner bag 4 can be twisted to reduce its diameter, thereby making it easier to pull the inner bag 4 out of the container body 2.

[0170] The mouth mounting component 8 can also be mounted to the protrusion 4c in a manner different from the above embodiment. For example, it can be mounted to the protrusion 4c in a snap-fit ​​manner. The mouth mounting component 8 and the protrusion 4c may or may not be engaged circumferentially. On the other hand, when the mouth mounting component 8 is rotated counterclockwise relative to the outer casing 3, the significance of the present invention is particularly evident if the mouth mounting component 8 and the protrusion 4c rotate circumferentially relative to each other before the inner bag 4 rotates relative to the outer casing 3, which is the same as in the above embodiment. In addition, the preferred range of T3 / T1 is also the same as in the above embodiment.

[0171] (Part 3) Reference Figures 20-24C The double-layered container 1 according to a third aspect of the present invention will be described. The matters described in the first aspect are applicable to this aspect without departing from its spirit, and the matters described in this aspect are applicable to the first aspect without departing from its spirit. Hereinafter, the description will focus on the differences from the first aspect.

[0172] 1-1. Composition of the double-layer container 1 like Figure 20 As shown, a double-layered container 1 according to one embodiment of the present invention includes a container body 2 and a mouth mounting component 8. The container body 2 contains contents. The contents are, for example, a high-viscosity substance with a viscosity of 100 mPa·s or more at 20°C. Examples of high-viscosity substances include ketchup, mayonnaise, and honey. The viscosity of the high-viscosity substance at 20°C is preferably 500 mPa·s or more, more preferably 1000 mPa·s or more, and even more preferably 5000 mPa·s or more. The upper limit of the viscosity of the high-viscosity substance at 20°C is not particularly specified, but is, for example, 10000, 50000, or 100000 mPa·s.

[0173] <Basic Structure of Container Body 2> like Figures 21-24C As shown, 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 is configured to be removable from the container body 2.

[0174] The container body 2 has an opening 5, a body 6, and a bottom 7. The opening 5 is a cylindrical (preferably cylindrical) portion with an open end 5c. The open end 5c is both the open end of the container body 2 and the open end of the inner bag 4.

[0175] The body 6 is positioned on the side farther from the opening end 5c than the opening 5 and is adjacent to the opening 5. The body 6 is cylindrical, with a bottom 7 located at the lower end of the body 6, closing the lower end of the body 6. The body 6 has a shoulder 6b whose circumference increases with distance from the opening 5 in a section perpendicular to the axial direction. "Circumference" refers to... Figures 24A-24CThe outer circumference length at a section perpendicular to the axial direction is shown. Shortening and lengthening of the circumference are also referred to as "reduction" and "expansion," respectively. Furthermore, the body 6 has a main body 6c on the side closer to the bottom 7 than the shoulder 6b. The shape of the main body 6c is, for example, either approximately constant in outer diameter towards the bottom 7, or reduced in diameter towards the bottom 7. In the following description, in... Figure 22 The portion of the second flange portion 3f2 shown below the lower surface 3f3, excluding the bottom 7, is referred to as the body portion 6.

[0176] like Figures 22-24C As shown, when the total height of the container body 2 is set as H, and the part of the body 6 with the largest circumference at the cross-section perpendicular to the axial direction is set as the maximum circumference part 2a, and the height of the maximum circumference part 2a from the bottom surface 7a of the container body 2 is set as Hmax, then Hmax / H is 0.20~0.40 (0.30 in this embodiment). Thus, in this embodiment, since the maximum circumference part 2a is located at a lower position of the container body 2, the body 6 of the container body 2 can gradually expand in diameter from the opening 5 of the container body 2 toward the maximum circumference part 2a. If the body 6 of the container body 2 expands in diameter rapidly, the friction between the inner bag 4 and the outer shell 3 increases when the inner bag 4 is pulled out, which easily leads to a greater force required to pull out the inner bag 4. However, in this embodiment, by making the body 6 of the container body 2 gradually expand in diameter toward the maximum circumference part 2a, the force required to pull out the inner bag 4 can be reduced.

[0177] Hmax / H is preferably 0.25~0.35, specifically, for example, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, or any range between any two values ​​mentioned herein. H is, for example, 150~180mm (164mm in this embodiment), preferably 160~170mm, specifically, for example, 150, 155, 160, 165, 170, 175, 180mm, or any range between any two values ​​mentioned herein. Hmax is, for example, 40~60mm (49mm in this embodiment), preferably 45~55mm, specifically, for example, 40, 45, 50, 55, 60mm, or any range between any two values ​​mentioned here.

[0178] like Figure 24C As shown, the major axis direction with the largest outer diameter at the part with the largest circumference 2a ( Figure 22 The outer diameter (i.e., the distance between outer surfaces) in the left-right direction is set to DLmax, and the distance between the minor axis and the major axis is set to DLmax. Figure 23AWhen the outer diameter (in the left-right direction) is set to DSmax, DSmax / DLmax is 0.70~0.95 (0.83 in this embodiment). Thus, in this embodiment, since the container body 2 is flat at its maximum circumference 2a, it is easy to crush the container body 2 to discharge the contents. DSmax / DLmax is preferably 0.75~0.90, specifically, for example, 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.80, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, or any range between any two values ​​mentioned here. DLmax is, for example, 50~75mm (62mm in this embodiment), preferably 55~70mm, specifically, for example, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75mm, or any range between any two values ​​mentioned herein. DSmax is, for example, 40~60mm (51mm in this embodiment), preferably 45~55mm, specifically, for example, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60mm, or any range between any two values ​​mentioned herein.

[0179] In the maximum circumference portion 2a, let the wall thickness of the part 2a1 furthest from the central axis C be TL, and the wall thickness of the part 2a2 closest to the central axis C be TS. TL / TS is, for example, 0.70~0.95 (0.83 in this embodiment). When discharging contents from the double-walled container 1, the container body 2 is usually deformed by crushing it along the short side. When TL / TS is within the above-mentioned value range, since the wall thickness of the part 2a2 pressed when crushing the container body 2 is relatively large, and the wall thickness of the part 2a1 that is bent when crushing the container body 2 is relatively small, it is easy to crush the container body 2 and easy to discharge the contents. The preferred value range of TL / TS is the same as that of DSmax / DLmax mentioned above. Since the wall thickness of the container body 2 is inversely proportional to the degree of stretching (blow-up ratio) during blow molding, if a preform 15 with a circular cross-section and constant circumferential wall thickness is used (e.g., Figure 30A , Figure 30B As shown, the container body 2 is formed by using a method where the distance from the central axis C increases. Therefore, the wall thickness of the container body 2 decreases as the distance from the central axis C increases. Thus, TL / TS is preferably proportional to DSmax / DLmax.

[0180] The part of the body 6 with the smallest perimeter at a cross section perpendicular to the axial direction is designated as the minimum perimeter part 2b. In this embodiment, the body 6 slightly narrows its diameter from the lower surface 3f3 of the second flange part 3f2 toward the minimum perimeter part 2b, and then gradually widens its diameter toward the maximum perimeter part 2a, reaching the maximum perimeter at the maximum perimeter part 2a, and then gradually narrows its diameter toward the bottom surface 7a.

[0181] When the height of the minimum circumference portion 2b from the bottom surface 7a of the container body 2 is set to Hmin, and the outer diameter along the major axis at the minimum circumference portion 2b is set to DLmin, the ratio of (DLmax-DLmin) / (Hmin-Hmax) (hereinafter referred to as the "first expansion index") is preferably 0.26 to 0.46 (0.36 in this embodiment). The first expansion index is calculated by dividing the difference in outer diameter between the maximum circumference portion 2a and the minimum circumference portion 2b by the distance in the height direction, and is an indicator of the degree of expansion of the body 6. The smaller the first expansion index, the more smoothly the container body 2 expands from the minimum circumference portion 2b to the maximum circumference portion 2a, and the easier it is to pull out the inner bag 4. Since the maximum circumference portion 2a is located at a lower position in the container body 2, the value of (Hmin-Hmax) becomes relatively large, so the first expansion index becomes a relatively small value. The first diameter expansion index is preferably 0.30 to 0.42, specifically, for example, 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, or it can be any range between any two values ​​mentioned here.

[0182] Hmin / H is preferably 0.80 to 0.90 (0.85 in this embodiment). Since the minimum circumference portion 2b is located at a higher position in the container body 2, it is easy to increase the internal volume of the container body 2 and to make the value of the first expansion index smaller. Specifically, Hmin / H is, for example, 0.80, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, or it can be a range between any two values ​​mentioned here. DLmin / DLmax is, for example, 0.38~0.58 (0.48 in this embodiment), preferably 0.43~0.53, specifically, for example 0.38, 0.39, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.50, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, or it can be any range between any two values ​​mentioned here.

[0183] When the outer diameter along the minor axis at the minimum perimeter portion 2b is DSmin, the ratio of DSmin / DLmin is, for example, 0.90 to 1.00 (1.00 in this embodiment). Thus, at the minimum perimeter portion 2b, the container body 2 is almost circular. The container body 2 is formed into a shape that gradually flattens from the minimum perimeter portion 2b to the maximum perimeter portion 2a. DSmin / DLmin is preferably 0.95 to 1.00, specifically, for example, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, or 1.00, or any range between any two values ​​mentioned here.

[0184] The body 6 preferably has an inwardly protruding inwardly curved portion 6d and an outwardly protruding outwardly curved portion 6e. The outwardly curved portion 6e is disposed on the side closer to the bottom surface 7a than the inwardly curved portion 6d. The maximum circumference portion 2a is disposed on the outwardly curved portion 6e. If the height of the junction 6f between the inwardly curved portion 6d and the outwardly curved portion 6e from the bottom surface 7a is set as Hb, and the outer diameter in the long axis direction at the junction 6f is set as DLb, then (DLmax-DLb) / (Hb-Hmax) (hereinafter referred to as the "second diameter expansion index") is preferably 0.28 to 0.48 (0.38 in this embodiment). The second diameter expansion index is calculated by dividing the difference in outer diameter between the maximum circumference portion 2a and the junction 6f by the distance in the height direction, and is an index representing the degree of diameter expansion between the maximum circumference portion 2a and the junction 6f. The smaller the second expansion index, the more smoothly the container body 2 expands from the junction 6f to the maximum circumference 2a, making the inner bag 4 easier to pull out. At the outwardly convex bend 6e, if the friction between the inner bag 4 and the outer shell 3 increases when pulling out the inner bag 4, it can easily lead to a greater force required to pull out the inner bag 4. However, in this embodiment, by making the body 6 of the container body 2 expand smoothly from the junction 6f to the maximum circumference 2a, the force required to pull out the inner bag 4 can be reduced. The second diameter expansion index is preferably 0.33 to 0.43, specifically, for example, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, or any range between any two values ​​mentioned here.

[0185] Hb / H is preferably 0.45 to 0.75 (0.60 in this embodiment). The junction 6f is preferably located near the center of the smallest circumference portion 2b and the largest circumference portion 2a. In this case, it is particularly easy to reduce the force required to pull out the inner bag 4. The preferred Hb / H ratio is 0.50 to 0.70, specifically, for example, 0.45, 0.46, 0.47, 0.48, 0.49, 0.50, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.60, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, or any range between any two values ​​mentioned here. DLb / DLmax is, for example, 0.60~0.80 (0.70 in this embodiment), preferably 0.65~0.75, specifically, for example, 0.60, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.80, or it can be any range between any two values ​​mentioned here.

[0186] When the outer diameter in the minor axis direction at the junction 6f is DSb, DSb / DLb is, for example, 0.76 to 0.96 (0.86 in this embodiment). Thus, at the junction 6f, the container body 2 is slightly flattened. The container body 2 is formed into a shape that gradually flattens from the junction 6f towards the maximum circumference 2a. DSb / DLb is preferably 0.81 to 0.91, specifically, for example, 0.76, 0.77, 0.78, 0.79, 0.80, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, or any range between any two values ​​mentioned here.

[0187] <Discharge of contents> In one example, the double-walled container 1 is a squeeze-type container. In this case, the double-walled container 1 is tilted so that the opening mounting member 8 is oriented downwards, and the body 6 is squeezed in this state, thereby expelling the contents of the inner bag 4 through the opening mounting member 8. After the contents are expelled, the squeezing of the body 6 is released, and the outer shell 3 returns to its original shape by restoring force. At this time, if external air can easily enter the inner bag 4, the outer shell 3 returns to its original shape together with the inner bag 4. However, if external air can easily enter the intermediate space between the inner bag 4 and the outer shell 3, the external air enters the intermediate space, and the outer shell 3 detaches from the inner bag 4 and returns to its original shape. If a check valve is provided on the opening mounting member 8, external air will not enter the inner bag 4, and therefore external air enters the intermediate space. In addition, even if a check valve is not provided on the opening mounting member 8, if the contents are a high-viscosity substance, the outlet 8d will be at least partially blocked by the contents, which may prevent external air from entering the inner bag 4. The smaller the inner diameter of the outlet 8d, the more pronounced this tendency becomes. Furthermore, when the outer casing 3 has an external air inlet hole, external air enters the intermediate space through the external air inlet hole. However, even if the outer casing 3 does not have an external air inlet hole, external air may sometimes enter the intermediate space through the gap between the outer casing 3 and the inner bag 4 at the opening 5. Once external air enters the intermediate space, the amount of air contained in the inner bag 4 will decrease accordingly. The less air contained in the inner bag 4, the easier it is for the inner bag 4 to shrink in diameter when it is pulled out. Therefore, by adopting a structure that allows external air to easily enter the intermediate space, the pull-out performance of the inner bag 4 can be improved.

[0188] (Aspect 4) 1. First Implementation Method Reference Figures 25-31B The double-layered container 1 according to the first embodiment of the fourth aspect of the present invention will be described. The matters described in the first aspect are applicable to this aspect without departing from its spirit, and the matters described in this aspect are applicable to the first aspect without departing from its spirit. Hereinafter, the description will focus on the differences from the first aspect. In the following description, "axial direction" refers to the central axis C of the opening 5 (…). Figure 26 (As shown) the direction of extension, for example, the direction in which the inner bag 4 is pulled out from the container body 2.

[0189] 1-1. Composition of the double-layer container 1 like Figures 25-27B As shown, the double-layered container 1 of the first embodiment of the present invention includes a container body 2 and a mouth mounting member 8. The container body 2 includes an inner bag 4 and an outer shell 3 configured to cover the inner bag 4.

[0190] <The engaging structure between the container body 2 and the mouth mounting component 8> In this embodiment, the mouth mounting member 8 is configured to be mounted on the mouth 5 in a pressure-fit manner, but it can also be configured to be mounted on the mouth 5 in a screw-on manner. In this embodiment, the circumferential engaging portion 4mb is positioned further away from the opening end 5c of the mouth 5 than the axial engaging portion 4ma, but it can also be positioned closer to the opening end 5c of the mouth 5 than the axial engaging portion 4ma.

[0191] <Detailed Composition of Mouth Mounting Component 8> Reference Figures 27A to 31B The mouth mounting component 8 will be described in detail below. The mouth mounting component 8 engages axially with the inner bag 4. Therefore, the inner bag 4 can be pulled out by pulling the mouth mounting component 8. Figure 28 As shown, the mouth mounting component 8 preferably has a discharge port 8d for discharging the contents of the inner bag 4. Additionally, the mouth mounting component 8 preferably includes a nozzle 8c.

[0192] The opening mounting component 8 includes a main body component 41 and an opening / closing component 42. When the opening mounting component 8 is a cover 8a, the main body component 41 is the cover body, and the opening / closing component 42 is the outer cover. The main body component 41 engages axially with the inner bag 4 and has a discharge port 8d communicating with the interior of the inner bag 4. The opening / closing component 42 is configured to open and close the discharge port 8d. Figure 27A , Figure 27B The diagram shows the closed state of the outlet 8d. By removing the opening / closing component 42 from the main body component 41, it can be changed to the open state with the outlet 8d open. In this embodiment, the main body component 41 and the opening / closing component 42 are not connected, but they can also be connected to each other by a hinge. The opening / closing component 42 is preferably able to engage with the main body component 41 by a locking structure such as a thread or a snap-fit.

[0193] like Figure 28As shown, the main body component 41 includes an outer cylinder 41a, an inner cylinder 41b, a nozzle 8c, 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 8c is disposed above the upper wall 41d. A flow hole 41i is provided on the upper wall 41d, through which the flow path of the inner cylinder 41b and the nozzle 8c communicates. Preferably, the flow hole 41i is sealed by a sealing component (not shown) before use, and the contents can flow through the flow hole 41i by removing the sealing component during use. The front end of the nozzle 8c becomes the discharge port 8d. The inner cylinder 41b is inserted into the protrusion 4c and closely abuts the inner surface 4f1 of the sealing cylinder portion 4f. Therefore, the inner cylinder 41b and the sealing cylinder portion 4f are engaged circumferentially. An engaging portion 8b is provided on the inner circumferential surface of the outer cylinder 41a. Preferably, an anti-slip shape is provided on the outer circumferential surface 41j of the outer cylinder 41a. In this case, it is easier to rotate the main body component 41 by gripping the outer peripheral surface 41j, so when pulling out the inner bag 4 while rotating it, it can prevent the opening and closing component 42 from being accidentally rotated without rotating the main body component 41. Methods for setting the anti-slip shape include forming a knurled shape on the outer peripheral surface 41j, roughening the outer peripheral surface 41j, or making the outer peripheral surface 41j polygonal (e.g., 6 to 12 sides) when viewed from above.

[0194] The opening / closing component 42 includes an outer cylinder 42a, an inner cylinder 42b, and an upper wall 42d. The outer cylinder 42a forms the outer peripheral surface of the opening / closing component 42. The inner cylinder 42b is disposed inside the outer cylinder 42a. The outer cylinder 42a and the inner cylinder 42b are connected via the upper wall 42d. The upper wall 42d does not have a discharge port for discharging the contents of the inner bag 4.

[0195] With the outlet 8d closed by the opening / closing member 42, the inner cylinder 42b is inserted into the nozzle 8c of the main body member 41 and closely adheres to the inner surface of the nozzle 8c. Meanwhile, the bottom surface of the outer cylinder 42a abuts against the upper wall 41d of the main body member 41. In this state, by grasping the outer cylinder 42a and applying an upward force to the opening / closing member 42, the opening / closing member 42 can be separated from the main body member 41, thus opening the outlet 8d.

[0196] like Figures 28-31B As shown, the opening / closing component 42 is provided with an easy-opening forming portion 50, which has a structure that facilitates the formation of an opening 51 communicating with the interior of the inner bag 4. Examples of structures constituting the easy-opening forming portion 50 include structures with a tear-reducing portion 8e and structures that remove a cover portion to close the opening 51. Forming the opening 51 at the easy-opening forming portion 50 is preferably done without the use of tools, or with the use of dining utensils (chopsticks or a straw). Furthermore, the formation of the opening 51 is preferably done without the use of any power other than human intervention. The weakening portion 8e is a part that has been weakened for easy tearing and can be constructed by thinning the wall or using a material with lower rigidity.

[0197] In this embodiment, such as Figures 29A to 31B As shown, the easy-opening forming part 50 includes a weakened part 8e provided on the opening / closing member 42 and a protrusion 8f provided adjacent to the weakened part 8e. The lower side of the protrusion 8f is a cavity 53. The easy-opening forming part 50 is configured such that when the protrusion 8f is bent down, the weakened part 8e is torn apart, allowing the cavity 53 to communicate with the outside, thereby forming an opening 51. With this structure, the opening 51 can be formed by bending down the protrusion 8f with a finger or the like.

[0198] More specifically, a recess 42e is provided on the upper wall 42d of the opening / closing member 42, and a weakening part 8e and a protrusion 8f are disposed within the recess 42e. The depth of the recess 42e is set so that the protrusion 8f does not protrude from the recess 42e. Therefore, the protrusion 8f will not become an obstacle when using the double-layer container 1. In addition, to prevent the protrusion 8f from being accidentally knocked over when using the double-layer container 1, such as Figure 28 As shown, a protective film 52 can also be provided to cover the recess 42e. The protrusion 8f can be flipped down after the protective film 52 is removed. Furthermore, as... Figures 29A-30B As shown, a recess 42f can also be provided surrounding the recess 42e. The recess 42f is shallower than the recess 42e, and the protective film 52 can be disposed within the recess 42f. This makes it less likely for fingers to touch the edge of the protective film 52, thus preventing accidental tearing of the protective film 52. Preferably, the depth of the recess 42f is equal to the thickness of the protective film 52. In this case, the upper surface of the protective film 52 is flush with the upper surface surrounding the recess 42f.

[0199] like Figures 29A-30B As shown, the bottom surface of the protrusion 8f is a rectangle with rounded corners, and the weakening portion 8e is provided around three sides of the protrusion 8f. Furthermore, the remaining side without the weakening portion 8e serves as a hinge portion 8g; by bending down the protrusion 8f, the weakening portion 8e is torn, thereby forming an opening 51. The weakening portion 8e only needs to have a tearable thickness, for example, 0.5 mm or less, preferably 0.3 mm or less. This thickness is, for example, 0.01 to 0.5 mm, specifically, for example, 0.01, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5 mm, or any range between any two values ​​mentioned here. The weakening portion 8e is preferably formed by providing a groove 8h around the protrusion 8f.

[0200] <Removing Inner Bag 4> The opening mounting component 8 engages with the opening 5 of the inner bag 4 in both the circumferential and axial directions, such that the inner bag 4 rotates relative to the outer casing 3 as the opening mounting component 8 rotates. Furthermore, through the action of the cam mechanism 31 provided between the inner bag 4 and the outer casing 3, the inner bag 4 moves in the direction of disengaging from the container body 2 as it rotates.

[0201] According to this structure, by rotating the opening mounting component 8, the inner bag 4 can be moved in the direction of disengaging from the container body 2 while twisting. Then, by pulling the opening mounting component 8, the inner bag 4 can be pulled out from the container body 2.

[0202] Before removing the inner bag 4, by forming an opening 51 communicating with the interior of the inner bag 4 on the opening mounting member 8 at the easy-open forming portion 50, it is possible to prevent the inner bag 4 from being difficult to remove due to air inside the inner bag 4. Furthermore, when removing the inner bag 4, it is not necessary to rotate the inner bag 4 relative to the outer casing 3; the inner bag 4 can be pulled axially without rotating it relative to the outer casing 3, thereby removing the inner bag 4 from the container body 2. In this case, the opening mounting member 8 only needs to engage with the inner bag 4 axially, and does not need to engage circumferentially.

[0203] 2. Second Implementation Method Reference Figures 32A-33B The second embodiment of the present invention will now be described. This embodiment is similar to the first embodiment, and the content described in the first embodiment can also be applied to this embodiment without departing from its spirit. The main difference between this embodiment and the first embodiment lies in the structure of the opening / closing member 42. Hereinafter, the description will focus on these differences.

[0204] In this embodiment, such as Figures 32A-33B As shown, the easy-opening forming part 50 includes a weakened part 8e provided on the opening / closing member 42 and a protrusion 8f provided adjacent to the weakened part 8e. The lower side of the protrusion 8f is a cavity 53. The easy-opening forming part 50 is configured such that when the protrusion 8f is pushed into the cavity 53, the weakened part 8e is torn, thereby forming an opening 51. According to this structure, the opening 51 can be formed by pressing the protrusion 8f with a finger or the like.

[0205] In this embodiment, the weakened portion 8e and the protrusion 8f are also disposed within the recess 42e provided on the upper wall 42d. The protrusion 8f in this embodiment can be lower than that in the first embodiment, and therefore the recess 42e can also be shallower than that in the first embodiment.

[0206] like Figure 32A , Figure 32B As shown, the bottom surface of the protrusion 8f is circular. A hinge portion 8g is provided on a portion of the outer periphery of the protrusion 8f, and a weakening portion 8e is provided on the portion other than the hinge portion 8g. When the protrusion 8f is pressed, the protrusion 8f rotates around the hinge portion 8g, causing the weakening portion 8e to be torn, thereby forming an opening 51. Preferably, as shown... Figure 33A As shown, the wall thickness of the hinge portion 8g is greater than that of the weakened portion 8e, and the outer and inner surfaces of the hinge portion 8g are curved.

[0207] 3. Third Implementation Method Reference Figures 34A-35B The third embodiment of the present invention will now be described. This embodiment is similar to the first and second embodiments, and the content described in the first and second embodiments can also be applied to this embodiment without departing from its spirit. The main difference between this embodiment and the first and second embodiments lies in the structure of the opening / closing member 42. Hereinafter, the description will focus on these differences.

[0208] In this embodiment, such as Figures 34A-35B As shown, the easy-opening forming part 50 includes a pressing part 8i provided on the opening / closing member 42. A cavity 53 is located below the pressing part 8i. The pressing part 8i is disposed adjacent to the weakening part 8e. The easy-opening forming part 50 is configured such that the tip 54a of an opening tool 54 is pressed onto the pressing part 8i, and the opening tool 54 is pushed into the cavity 53, thereby tearing the weakening part 8e to form an opening 51. As the opening tool 54, a tool capable of forming the opening 51 by manually pressing the pressing part 8i can be used; for example, a dining utensil (chopsticks or a straw) is preferably used.

[0209] The pressing part 8i is disposed within the recess 42e provided in the upper wall 42d. Unlike the protrusion 8f, the pressing part 8i does not need to protrude upwards, so the recess 42e can be shallower compared to the first and second embodiments.

[0210] like Figure 34A , Figure 34B As shown, the pressing part 8i is circular, and a hinge part 8g is provided on a portion of the outer periphery of the pressing part 8i. A weakening part 8e is provided on the portion other than the hinge part 8g. The weakening part 8e is preferably formed by providing a groove 8h around the pressing part 8i. When the pressing part 8i is pressed with the front end 54a of the opening tool 54, the pressing part 8i rotates around the hinge part 8g while tearing the weakening part 8e, thereby forming an opening 51.

[0211] Furthermore, in a variation of the third embodiment, such as Figure 36A Figure 36B As shown, the pressing part 8i is composed of a weakened part 8e. In this case, when the pressing part 8i is pressed with the tip 54a of the opening tool 54, the weakened part 8e is torn, thereby forming an opening 51.

[0212] 4. Fourth Implementation Method Reference Figures 37A to 41B The fourth embodiment of the present invention will now be described. This embodiment is similar to the first embodiment, and the content described in the first embodiment can also be applied to this embodiment without departing from its spirit. The main difference between this embodiment and the first embodiment lies in the structure of the opening / closing member 42. Hereinafter, the description will focus on these differences.

[0213] In this embodiment, such as Figures 37A to 41B As shown, the easy-opening forming part 50 includes a cover part 8j provided on the opening and closing member 42. (As shown...) Figure 40A , Figure 40B As shown, the cover portion 8j is connected to the peripheral wall of the cavity 53 located on the lower side of the cover portion 8j at the connecting portion 8k. Figure 41A , Figure 41B As shown, the easy-opening forming part 50 is configured such that by grasping and pulling up the gripping part 8l provided on the cover part 8j, the connecting part 8k is torn to expose the cavity 53, thereby forming an opening 51.

[0214] like Figures 38A-39B As shown, the connecting portion 8k includes an annular portion 8k1 disposed at the edge of the cavity 53 and a linear portion 8k2 connected to the annular portion 8k1. The linear portion 8k2 is preferably straight. Furthermore, the annular portion 8k1 is preferably disposed between a pair of linear portions 8k2. In this case, a tear starting from the end of the linear portion 8k2 can be transmitted to the annular portion 8k1, thereby tearing the annular portion 8k1. The connecting portion 8k includes a tear-stopping portion 8k3 with a line width wider than both the annular portion 8k1 and the linear portion 8k2. A tear starting from one end 8k4 of the linear portion 8k2 advances through the annular portion 8k1 and stops at the tear-stopping portion 8k3. Thus, separation of the cover portion 8j from the upper wall 42d can be prevented.

[0215] like Figure 38A , Figure 38B and Figure 40A , Figure 40B As shown, a base 8m is preferably provided on the upper wall 42d, and a connecting portion 8k is provided between the base 8m and the cover portion 8j. The base 8m has an inclined surface 8m1, which causes the width of the base 8m to narrow towards the connecting portion 8k. The inclined surface 8m1 intersects the lower surface 8j3 of the cover portion 8j at an acute angle. Therefore, when a peeling force is applied to the cover portion 8j, the connecting portion 8k is easily torn at the intersection of the inclined surface 8m1 and the lower surface 8j3.

[0216] like Figure 39A , Figure 39B and Figure 41A , 41B As shown, the end of the linear portion 8k2 of the cover 8j, on the side of end 8k4, is not connected to the base 8m; this end becomes the gripping portion 8l. The distance between the cover 8j and the upper wall 42d widens at the gripping portion 8l towards the end 8j1 of the cover 8j, making the gripping portion 8l easier to grip.

[0217] 5. Fifth Implementation Method Reference Figure 42A , Figure 42BThe fifth embodiment of the present invention will now be described. This embodiment is similar to the first embodiment, and the content described in the first embodiment can also be applied to this embodiment without departing from its spirit. The main difference between this embodiment and the first embodiment lies in the structure of the mouth mounting member 8. Hereinafter, the description will focus on these differences.

[0218] In the first embodiment, the outer cylinder 41a of the main body component 41 and the outer cylinder 42a of the opening / closing component 42 have the same diameter, and there is no step between them. While this configuration is aesthetically pleasing, when rotating the opening mounting component 8 to remove the inner bag 4, it is possible that only the opening / closing component 42 might be rotated instead of the main body component 41 and the opening / closing component 42 being rotated together. To suppress this problem, in this embodiment, the diameter of the outer cylinder 41a of the main body component 41 is larger than the diameter of the outer cylinder 42a of the opening / closing component 42. In this case, the main body component 41 has an exposed portion 41a2 that is not covered by the lower end 42a1 of the outer cylinder 42a. With this structure, when the opening mounting component 8 is pinched with a finger to rotate it, the pressure applied by the finger to the outer cylinder 41a of the main body component 41 increases, so the main body component 41 is naturally easier to rotate when attempting to rotate the opening mounting component 8, thereby suppressing the aforementioned problem. Furthermore, as described in the first embodiment, it is preferable to provide an anti-slip shape on the outer peripheral surface 41j of the outer cylinder 41a of the main body component 41. In this case, the main body component 41 will be easier to rotate.

[0219] 6. Sixth Implementation Method Reference Figures 43A-44B The sixth embodiment of the present invention will now be described. This embodiment is similar to the fifth embodiment, and the content described in the fifth embodiment can also be applied to this embodiment without departing from its spirit. The main difference between this embodiment and the fifth embodiment lies in the structure of the mouth mounting member 8. Hereinafter, the description will focus on these differences.

[0220] In the fifth embodiment, the exposed portion 41a2 is formed by expanding the diameter of the outer cylinder 41a of the main body component 41. However, in this embodiment, the shape of the main body component 41 remains unchanged, and the exposed portion 41a2 is formed by narrowing the outer circumference of the lower end 42a1 of the outer cylinder 42a of the opening / closing component 42. In the exposed portion 41a2, the main body component 41 is not covered by the lower end 42a1. A step is formed between the main body component 41 and the opening / closing component 42 in the exposed portion 41a2. In this embodiment, a plurality of narrowed portions 42a2 (eight in this embodiment) are provided at intervals on the lower end 42a1, but the narrowed portions 42a2 may also be provided around the entire circumference of the lower end 42a1. In this embodiment, the narrowed portions 42a2 are formed by reducing the wall thickness of the outer cylinder 42a, but it is also possible to make the degree to which the outer cylinder 42a protrudes inward the same as the depth of the narrowed portions 42a2 without changing the wall thickness. In this embodiment, the problem of only rotating the opening / closing member 42 can be suppressed through the same effect as in the fifth embodiment. Furthermore, the reduced diameter portion 42a2 can extend to the upper end of the outer cylinder 42a. In the inventive viewpoint of providing the exposed portion 41a2, it is not necessary to provide the easy-opening forming portion 50 on the opening / closing member 42.

[0221] 7. Implementation Method 7 Reference Figures 45A-46B The seventh embodiment of the present invention will now be described. This embodiment is similar to the sixth embodiment, and the content described in the sixth embodiment can also be applied to this embodiment without departing from its spirit. The main difference between this embodiment and the sixth embodiment lies in the structure of the mouth mounting member 8. Hereinafter, the description will focus on these differences.

[0222] In the sixth embodiment, the exposed portion 41a2 is formed by reducing the outer circumference of the lower end 42a1 of the outer cylinder 42a of the opening / closing member 42. In this embodiment, the exposed portion 41a2 is formed by providing a notch 42a3 on the lower end 42a1. In the exposed portion 41a2, the main body member 41 is not covered by the lower end 42a1. In this embodiment, multiple (eight in this embodiment) notches 42a3 are provided at intervals on the lower end 42a1, but the reduced diameter portion 42a2 can also be provided around the entire circumference of the lower end 42a1. In this embodiment, the problem of only rotating the opening / closing member 42 can be suppressed through the same effect as in the fifth embodiment.

[0223] Explanation of reference numerals in the attached figures 1: Double-layered container; 2: Container body; 2a: Maximum circumference; 2a1: Part; 2a2: Part; 2b: Minimum circumference; 3: Outer shell; 3a: Open end; 3a1: Base surface; 3a2: Annular protrusion; 3a3: Inner bag support surface; 3a4: Vertex; 3f1: First flange; 3f2: Second flange; 3f3: Lower surface; 3f4: Central surface; 3f5: Upper surface; 3g: Recess; 3l: Cam guide rail; 3m: Recessed strip; 4: Inner bag; 4a: First cylinder; 4b: Second cylinder; 4b1: Peripheral wall; 4b2: Lower wall; 4b3: Corner; 4b4: Lower surface; 4c: Protrusion; 4c1: Protruding cylinder; 4c10: Flange; 4c11: Lower surface; 4c12: Outer peripheral surface; 4c13: 4c14: Upper surface; 4c2: Engaging protrusion; 4c5: Annular protrusion; 4c8: Conical surface; 4c9: External thread; 4d: Inner bag body; 4e: Inclined part; 4f: Sealing cylinder part; 4f1: Inner surface; 4g: Raised strip; 4i: Concave-convex part; 4i1: Concave part; 4i2: Protrusion; 4m3: Lower surface; 4ma: Axial engagement part; 4mb: Circumferential engagement part; 4o: Expanded diameter part; 5: Mouth; 5b: Flange; 5b1: Outer circumferential surface; 5c: Opening end; 6: Body; 6b: Shoulder; 6c: Body main body; 6d: Inner convex bend; 6e: Outer convex bend; 6f: Junction; 7: Bottom; 7a: Bottom surface; 8: Mouth mounting component; 8a: Cover; 8b: Engaging part; 8b1: ​​Internal thread. 8b3: Annular protrusion, 8b4: Front end, 8c: Nozzle, 8d: Discharge port, 8e: Weakening part, 8f: Protrusion, 8g: Hinge part, 8h: Groove, 8i: Pressing part, 8j: Cover part, 8j1: One end, 8j3: Lower surface, 8k: Connecting part, 8k1: Annular part, 8k2: Linear part, 8k3: Tear stop part, 8k4: One end, 8l: Grip part, 8m: Base, 8m1: Inclined surface, 9: Pump, 9a: Cylinder part, 9a1: Threaded cylinder part, 9a2: Top part, 9a3: Sliding cylinder part, 9a4: Lower end, 9b: Nozzle, 9c: Piston part, 9d: Pump mechanism part, 9e: Conduit, 9f: Pressing head, 9f1: Cylinder part, 9g: Flange, 11: Container, 13: Outer preform, 1 3a: Mouth, 13b: Body, 13c: Bottom, 13d: Opening end, 13f2: Second flange, 13f3: Lower surface, 13l: Cam guide rail, 14: Inner preform, 14a: Mouth, 14b: Body, 14c: Bottom, 14c2: Engaging protrusion, 14c21: Engaging protrusion, 14c22: Engaging protrusion, 14c23: Engaging protrusion, 14c24: Engaging protrusion, 14g: Protrusion, 15: Preform, 15a: Mouth, 15b: Body, 15c: Bottom, 15g: Cam mechanism, 31: Cam mechanism, 41: Main body component, 41a: Outer cylinder, 41a1: Opening end, 41a2: Exposed part, 41b: Inner cylinder, 41b1: Outer peripheral surface, 41d: Upper wall.41i: Flow hole, 41j: Outer peripheral surface, 42: Opening / closing component, 42a: Outer cylinder, 42a1: Lower end, 42a2: Reduced diameter section, 42a3: Notch section, 42b: Inner cylinder, 42d: Upper wall, 42e: Recess, 42f: Recess, 43: Hinge, 44: Gap, 45: Engaging component, 45a: Opening, 45b: Peripheral surface, 45c: Concave / convex section, 45c1: Recess 45c2: Protrusion, 45d: Cylindrical part, 45d1: Outer peripheral surface, 45e: Top surface, 45g: Upper surface, 45h: Opening end, 46: Sealing component, 46a: Opening, 47: Circumferential engaging part, 50: Easy-opening forming part, 51: Opening, 52: Protective film, 53: Cavity, 54: Opening tool, 54a: Front end, C: Central axis, PL: Parting line, α: Angle.

Claims

1. A container comprising a container body and an opening mounting component installed at the opening of the container body, wherein, The mouth mounting component is configured to be installed in the mouth in a pressure-fit manner. The container body has an axial engaging portion that engages with the mouth mounting component in the axial direction, and a circumferential engaging portion that engages with the mouth mounting component in the circumferential direction. The axial direction is the direction extending from the central axis of the opening, and the circumferential direction is the direction of rotation centered on the central axis. The circumferential engaging portion is positioned further away from the opening end of the mouth than the axial engaging portion. The mouth mounting component has a locking part. The engaging portion of the mouth mounting component engages axially relative to the axial engaging portion and engages circumferentially relative to the circumferential engaging portion.

2. The container according to claim 1, wherein, The circumferential engaging portion has a plurality of engaging protrusions arranged at intervals along the circumferential direction.

3. The container according to claim 1, wherein, The axial engaging portion has an annular protrusion.

4. The container according to claim 1, wherein, The container body includes an inner bag and an outer shell configured to cover the inner bag. The inner bag has a protrusion that extends from the open end of the outer shell. The axial engaging portion and the circumferential engaging portion are disposed on the protrusion.

5. The container according to any one of claims 1 to 4, wherein, The mouth mounting component has an outer cylinder. The engaging part is located on the inner circumferential surface of the outer cylinder.

6. A method for manufacturing a container according to any one of claims 1 to 4, wherein, The container body is manufactured by biaxial stretch blow molding of a preform.

7. A double-layered container, comprising a container body, a locking component, and a mouth mounting component, wherein, The container body includes an inner bag and an outer shell configured to cover the inner bag. The inner bag has a protrusion that extends from the open end of the outer shell. The mouth mounting component is mounted on the protrusion. At the circumferential engagement portion, the engagement component engages with the protrusion in the circumferential direction.

8. The double-layered container according to claim 7, wherein, The container body is configured such that, when viewed from above the double-layered container, the inner bag displaces in a direction that causes it to detach from the container body when the inner bag is rotated relative to the outer shell in one direction.

9. The double-layered container according to claim 8, wherein, The mouth mounting component and the protrusion are threaded together in such a way that the rotation of the mouth mounting component relative to the protrusion in one direction is a loosening direction of the threaded engagement.

10. The double-walled container according to any one of claims 7 to 9, wherein, At the circumferential engagement portion, the engagement component and the protrusion engage in a concave-convex engagement in the circumferential direction.

11. The double-walled container according to any one of claims 7 to 9, wherein, The protrusion is provided with an external thread. The inner bag is equipped with a flange. The lower surface of the flange abuts against the housing. The circumferential engagement portion is disposed between the external thread portion and the flange.

12. The double-walled container according to any one of claims 7 to 9, wherein, The protrusion is disposed within the opening of the engaging member.

13. The double-walled container according to claim 12, wherein, The engaging component includes a cylindrical portion and a top portion disposed on the top surface of the cylindrical portion. The opening is located on the top surface. The circumferential surface of the opening engages with the outer circumferential surface of the protrusion in the circumferential direction.

14. The double-walled container according to claim 13, wherein, The protrusion is provided with an external thread. The inner bag is equipped with a flange. The lower surface of the flange abuts against the housing. The circumferential engaging portion is disposed between the external thread portion and the flange. The upper surface of the flange abuts against the top surface. The cylindrical portion of the engaging component is configured to surround the outer casing.

15. A double-layered container, comprising a container body, wherein, The container body includes an inner bag and an outer shell configured to cover the inner bag. The inner bag is configured to be removable from the container body. The container body has a mouth, a body, and a bottom. The mouth is a cylindrical portion with an open end. The body is located on a side farther from the open end than the mouth and is adjacent to the mouth. The bottom is configured to close the lower end of the body. If we take the direction of the central axis extending from the opening of the container body as the axial direction, the total height of the container body as H, the part of the body with the largest perimeter at a cross-section perpendicular to the axial direction as the maximum perimeter part, and the height of the maximum perimeter part from the bottom surface of the container body as Hmax, then the body has a shoulder part, which is configured such that the perimeter at a cross-section perpendicular to the axial direction increases as it moves away from the opening. Hmax / H is 0.20~0.

40. If the outer diameter along the major axis, where the outer diameter is largest at the maximum circumference, is taken as DLmax, and the outer diameter along the minor axis, which is perpendicular to the major axis, is taken as DSmax, then DSmax / DLmax is 0.70~0.

95.

16. The double-walled container according to claim 15, wherein, If the part with the smallest perimeter in the cross section perpendicular to the axial direction of the body is taken as the minimum perimeter part, the height of the minimum perimeter part from the bottom surface of the container body is taken as Hmin, and the outer diameter of the minimum perimeter part in the major axis direction is taken as DLmin, then (DLmax-DLmin) / (Hmin-Hmax) is 0.26~0.

46.

17. The double-walled container according to claim 16, wherein, Hmin / H is 0.80~0.

90.

18. The double-walled container according to any one of claims 15 to 17, wherein, The body portion has an inwardly protruding inward curved portion and an outwardly protruding outward curved portion, the outwardly protruding curved portion being disposed on a side closer to the bottom surface than the inwardly protruding curved portion. The portion with the largest circumference is located on the outwardly convex curved portion. If the height of the junction between the inner convex curved portion and the outer convex curved portion from the bottom surface is taken as Hb, and the outer diameter in the long axis direction at the junction is taken as DLb, then (DLmax-DLb) / (Hb-Hmax) is 0.28~0.

48.

19. The double-walled container according to claim 18, wherein, Hb / H is 0.45~0.

75.

20. A double-walled container comprising a container body and an opening mounting component installed at the opening of the container body, wherein, The container body includes an inner bag and an outer shell configured to cover the inner bag. If the direction of the central axis extending from the opening of the container body is taken as the axial direction, then The mouth mounting component comprises a main body component and an opening / closing component. The main body component engages with the inner bag in the axial direction and has a discharge port communicating with the interior of the inner bag. The opening and closing component is configured to open and close the discharge port. The opening and closing component is provided with an easy-opening forming part, which has a structure that facilitates the formation of an opening communicating with the interior of the inner bag.

21. The double-walled container according to claim 20, wherein, The opening and closing component includes an outer cylinder forming the outer peripheral surface of the opening and closing component. The main body component has an exposed portion that is not covered by the lower end of the outer cylinder and is exposed to the outside.

22. The double-walled container according to claim 20 or 21, wherein, The easy-opening forming portion includes a weakening portion provided on the opening and closing member and a protrusion provided adjacent to the weakening portion. The protrusion has a cavity on its lower side. The easy-opening forming part is configured such that when the protrusion is bent down, the weakened part is torn apart, so that the cavity communicates with the outside, thereby forming the opening.

23. The double-walled container according to claim 20 or 21, wherein, The easy-opening forming portion includes a weakening portion provided on the opening and closing member and a protrusion provided adjacent to the weakening portion. The protrusion has a cavity on its lower side. The easy-opening forming portion is configured to tear the weakened portion when the protrusion is pushed into the cavity, thereby forming the opening.

24. The double-walled container according to claim 20 or 21, wherein, The easy-opening forming part includes a pressing part provided on the opening and closing component. The lower side of the pressing part is provided with a cavity. The pressing part is composed of a weakened part or is arranged adjacent to a weakened part. The easy-opening forming part is configured such that the front end of the opening tool is pressed onto the pressing part, thereby pushing the opening tool into the cavity, thereby tearing the weakened part to form the opening.

25. The double-walled container according to claim 20 or 21, wherein, The easy-opening forming part includes a cover portion provided on the opening and closing component. The cover is connected to the peripheral wall of the cavity located on the lower side of the cover at the connection portion. The easy-opening forming part is configured such that by grasping and pulling up the gripping part provided on the cover, the connecting part is torn to expose the cavity, thereby forming the opening.

26. A double-walled container comprising a container body and an opening mounting component installed at the opening of the container body, wherein, The container body includes an inner bag and an outer shell configured to cover the inner bag. If the direction of the central axis extending from the opening of the container body is taken as the axial direction, then The mouth mounting component comprises a main body component and an opening / closing component. The main body component engages with the inner bag in the axial direction and has a discharge port communicating with the interior of the inner bag. The opening and closing component is configured to open and close the discharge port. The opening and closing component includes an outer cylinder forming the outer peripheral surface of the opening and closing component. The main body component has an exposed portion that is not covered by the lower end of the outer cylinder and is exposed to the outside.

Images