Double container

Abstract

To provide a double container which makes it easy to pull out an inner bag from a container body.SOLUTION: The double container includes a container body and a mouth attaching member mounted on a mouth of the container body. The container body includes an inner bag and an outer shell arranged to cover the inner bag. A direction in which the center axis of the mouth of the container body extends is defined as the axial direction. The mouth attaching member includes a body member and an opening / closing member. The body member is engaged with the inner bag in the axial direction and has a discharge opening communicating with the inside of the inner bag. The opening / closing member is configured to open and close the discharge opening. The opening / closing member is provided with an easy-opening forming part having a structure that facilitates formation of an opening communicating with the inside of the inner bag.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a double container.

Background Art

[0002] Conventionally, a double container including a container body having an outer shell and an inner bag has been known. For example, Patent Document 1 discloses a double container formed by performing biaxial stretch blow molding in a state where an outer shell preform and an inner bag preform are stacked.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when the outer shell and the inner bag of such a double container are formed of different materials, or when the contents adhere to the inner bag after use, etc., when recycling the double container, it is desirable to separate the outer shell and the inner bag.

[0005] It is assumed that the outer shell and the inner bag are separated by pulling out the inner bag from the container body. In order to simplify the operation of pulling out the inner bag from the container body as much as possible, a method of pulling out the inner bag by pulling the cap after axially engaging the cap with the inner bag is conceivable.

[0006] However, in order to prevent leakage of the contents of the inner bag, the cap is attached so as to seal the opening of the inner bag. When trying to pull out the inner bag with the cap attached, since the air in the inner bag cannot escape, the inner bag may not shrink and it may be difficult to pull out the inner bag.

[0007] The present invention has been made in view of such circumstances, and provides a double container in which an inner bag can be easily pulled out from a container body.

Means for Solving the Problems

[0008] According to the present invention, the following inventions are provided. [1] A double container including a container body and a mouth portion mounting member mounted on the mouth portion of the container body, wherein the container body includes an inner bag and an outer shell disposed so as to cover the inner bag. When the direction in which the central axis of the mouth portion of the container body extends is defined as the axial direction, the mouth portion mounting member includes a main body member and an opening / closing member. The main body member is engaged with the inner bag in the axial direction and has a discharge port communicating with the inside of the inner bag. The opening / closing member is configured to be able to open and close the discharge port, and the opening / closing member is provided with an easy-opening formation portion having a structure that facilitates the formation of an opening communicating with the inside of the inner bag. [2] The double container according to [1], wherein the opening / closing member includes an outer cylinder constituting the outer peripheral surface of the opening / closing member, and the main body member is provided with an exposed portion that is exposed to the outside without being covered by the lower end of the outer cylinder. [3] The double container according to [1] or [2], wherein the easy-opening formation portion includes a weakened portion provided on the opening / closing member and a protrusion provided adjacent to the weakened portion, a cavity is provided below the protrusion, and the easy-opening formation portion is configured to be able to form the opening by tearing the weakened portion when the protrusion is knocked down to communicate the cavity with the outside. [4] The double container according to [1] or [2], wherein the easy-opening formation portion includes a weakened portion provided on the opening / closing member and a protrusion provided adjacent to the weakened portion, a cavity is provided below the protrusion, and the easy-opening formation portion is configured to be able to form the opening by tearing the weakened portion when the protrusion is pushed into the cavity. The double container according to [5][1] or [2], wherein the easy-opening formation part includes a pressing part provided on the opening / closing member, a cavity is provided below the pressing part, the pressing part is composed of a weakened part or is provided adjacent to the weakened part, and the easy-opening formation part is configured to be able to form the opening by pressing the tip of an opener against the pressing part and pushing the opener into the cavity to tear the weakened part. The double container according to [6][1] or [2], wherein the easy-opening formation part includes a lid part provided on the opening / closing member, the lid part is connected to the peripheral wall of a cavity provided below the lid part at a connecting part, and the easy-opening formation part is configured to be able to form the opening by gripping and pulling up a gripping part provided on the lid part to tear the connecting part and expose the cavity. A double container including a container body and a mouth part mounting member mounted on the mouth part of the container body, wherein the container body includes an inner bag and an outer shell disposed so as to cover the inner bag. When the direction in which the central axis of the mouth part of the container body extends is defined as the axial direction, the mouth part mounting member includes a main body member and an opening / closing member. The main body member is engaged with the inner bag in the axial direction and has a discharge port communicating with the inside of the inner bag. The opening / closing member is configured to be able to open and close the discharge port, the opening / closing member includes an outer cylinder constituting the outer peripheral surface of the opening / closing member, and an exposed part that is not covered by the lower end of the outer cylinder and is exposed to the outside is provided on the main body member.

Advantages of the Invention

[0009] In the double container of the present invention, the opening / closing member provided on the mouth part mounting member is provided with an easy-opening formation part having a structure that facilitates the formation of an opening communicating with the inside of the inner bag. Therefore, it is easy to form an opening in the opening / closing member. After the opening is formed, when the inner bag is pulled out, the air in the inner bag can escape through the opening, so it is easy to pull out the inner bag from the container body.

Brief Description of the Drawings

[0010]

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Embodiments for Carrying out the Invention

[0011] Hereinafter, embodiments of the present invention will be described. Various characteristic matters shown in the following embodiments can be combined with each other. An invention can be established independently for each characteristic. Among the following embodiments, elements not defined in the claims are optional elements and can be omitted. At the end of the numerical values disclosed in the following description, any number (for example, one or two) of "0" may be added. For example, one or two "0" may be added after "1.4" to be "1.40" or "1.400".

[0012] 1. First Embodiment The double container 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 11. Terms related to directions such as "up" and "down" in the following description mean directions in a state where the bottom portion 7 is grounded. Also, the "axial direction" in the following description is the direction in which the central axis C (shown in FIG. 2) of the mouth portion 5 extends, for example, the direction in which the inner bag 4 is pulled out from the container body 2. The "circumferential direction" is the rotational direction around the central axis C of the mouth portion 5, for example, the direction in which the inner bag 4 is rotated with respect to the outer shell 3 at the mouth portion 5. "Clockwise" and "counterclockwise" are directions as viewed from the upper side of the double container 1 unless otherwise specified.

[0013] 1-1. Configuration of the Double Container 1 As shown in FIG. 1, the double container 1 according to the first embodiment of the present invention includes a container body 2 and a mouthpiece mounting member 8. Hereinafter, each configuration will be described in detail.

[0014] <Basic Configuration of the Container Body 2> As shown in FIGS. 2 to 3, the container body 2 includes a mouth portion 5, a body portion 6, and a bottom portion 7. The mouth portion 5 is a cylindrical (preferably circular cylindrical) portion having an open end 5c. The open end 5c is the open end of the container body 2 and also the open end of the inner bag 4.

[0015] The body portion 6 is disposed adjacent to the mouth portion 5 on the side farther from the open end 5c than the mouth portion 5. The body portion 6 has a larger outer diameter (in this specification, the "outer diameter" means the equivalent diameter of a circle when the cross section is not circular) than the mouth portion 5. The body portion 6 is cylindrical, and the bottom portion 7 is provided at the lower end of the body portion 6 and closes the lower end of the body portion 6. The body portion 6 includes a shoulder portion 6b whose outer diameter increases as it moves away from the mouth portion 5. Further, the body portion 6 includes a body main portion 6c on the bottom portion 7 side of the shoulder portion 6b. The body main portion 6c has a shape in which the outer diameter is substantially constant toward the bottom portion 7, or a shape in which the diameter decreases toward the bottom portion 7.

[0016] As shown in FIGS. 3 to 6, the container body 2 includes an inner bag 4 and an outer shell 3 disposed so as to cover the inner bag 4. The inner bag 4 has an inner bag main body 4d other than the protruding portion 4c housed inside the outer shell 3. In the following description, the portions of the inner bag 4 corresponding to the mouth portion 5, the body portion 6, and the bottom portion 7 of the container body 2 are referred to as the mouth portion 5, the body portion 6, and the bottom portion 7 of the inner bag 4, respectively. The same applies to the outer shell 3.

[0017] <Engaging Structure between the Container Body 2 and the Mouth Mounting Member 8> The mouth-attaching member 8 is a member that is attached to the mouth portion 5 of the container body 2. In this embodiment, the mouth-attaching member 8 is a cap 8a, but it may be another member such as a pump. In this embodiment, the mouth-attaching member 8 is configured to be attached to the mouth portion 5 in a plugging manner, but it may be configured to be attached to the mouth portion 5 in a screwing manner. As shown in FIG. 6, the container body 2 includes an axially engaging portion 4ma that axially engages with the mouth-attaching member 8 and a circumferentially engaging portion 4mb that circumferentially engages with the mouth-attaching member 8. In this embodiment, the circumferentially engaging portion 4mb is disposed at a position farther from the opening end 5c of the mouth portion 5 than the axially engaging portion 4ma, but it may be disposed at a position closer to the opening end 5c of the mouth portion 5 than the axially engaging portion 4ma. It is preferable that the container body 2 and the mouth-attaching member 8 do not engage with each other at portions other than the axially engaging portion 4ma and the circumferentially engaging portion 4mb.

[0018] The mouth-attaching member 8 includes an engaging portion 8b. The engaging portion 8b is preferably provided on the inner peripheral surface of the outer cylinder 41a of the mouth-attaching member 8. The engaging portion 8b is preferably an annular convex portion 8b3. The engaging portion 8b axially engages with the axially engaging portion 4ma and circumferentially engages with the circumferentially engaging portion 4mb. The circumferential engagement between the circumferentially engaging portion 4mb and the engaging portion 8b may be a concavo-convex engagement or a frictional engagement. Since the engaging portion 8b is a portion provided in substantially all plugging-type mouth-attaching members 8, according to the configuration of the present invention, it is possible to realize a rotation restricting structure between the mouth-attaching member 8 and the container body 2 using a plugging-type mouth-attaching member 8 having substantially any configuration, and the degree of freedom in selecting the mouth-attaching member 8 is very high. Plugging-type mouth-attaching members having dimensions and shapes conforming to the F-mouth standard are widely distributed and are excellent in availability.

[0019] As shown in FIG. 6, the axially engaging portion 4ma preferably includes an annular convex portion 4c5, and the circumferentially engaging portion 4mb preferably includes a plurality of engaging convex portions 4c2 that are spaced apart along the circumferential direction. The annular convex portion 4c5 is provided with a tapered surface 4c8 on the upper surface. This makes it easier for the engaging portion 8b to overcome the annular convex portion 4c5 when attaching the mouth-attaching member 8.

[0020] When the engaging portion 8b gets over the axial engaging portion 4ma and engages with the axial engaging portion 4ma, the state shown in Fig. 3B is reached. In this state, the tip 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 are in frictional engagement. Also, for example, when the circumferential engaging portion 4mb is composed of a plurality of engaging convex portions 4c2, each engaging convex portion 4c2 has a tapered shape, and the engaging portion 8b is more deformable than the engaging convex portion 4c2, when the engaging portion 8b is pressed against the engaging convex portion 4c2, the engaging convex portion 4c2 sinks into the engaging portion 8b, and the engaging portion 8b and the engaging convex portion 4c2 are in concavo-convex engagement in the circumferential direction. In one example, when the engaging portion 8b is made of a polyethylene-based resin and the engaging convex portion 4c2 is made of a polypropylene-based resin, the polypropylene-based resin usually has higher rigidity than the polyethylene-based resin, so the engaging convex portion 4c2 is likely to sink into the engaging portion 8b.

[0021] <Detailed structure of the outer shell 3 and the inner bag 4> As shown in Fig. 4, the inner bag 4 is provided with a protruding portion 4c protruding from the open end 3a of the outer shell 3. As shown in Figs. 5 to 6, the inner bag 4 includes a first cylinder 4a and a second cylinder 4b. The first cylinder 4a is disposed inside the outer shell 3. The second cylinder 4b has a larger outer diameter than the first cylinder 4a and is disposed at a position closer to the open end 5c of the inner bag 4 than the first cylinder 4a. The second cylinder 4b may be entirely disposed outside the outer shell 3, or a part or all of the second cylinder 4b may be disposed inside the outer shell 3 and the remainder may be disposed outside the outer shell 3.

[0022] As shown in FIG. 5, the second cylinder 4b includes a peripheral wall 4b1 and a bottom wall 4b2 provided below the peripheral wall 4b1 and configured to reduce the diameter of the peripheral wall 4b1 toward the first cylinder 4a. The inner bag 4 is arranged such that the bottom wall 4b2 abuts against the outer shell 3. When the bottom wall 4b2 abuts against the outer shell 3, the entry of the inner bag 4 into the outer shell 3 is suppressed. The peripheral wall 4b1 preferably extends parallel to the axial direction. Further, the angle α of the peripheral wall 4b1 with respect to the bottom 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 bottom wall 4b2 and the peripheral wall 4b1 becomes relatively gentle, and it is less likely to crack when an impact is applied, so the impact resistance is improved. The length L1 between the lower surface 4b4 of the bottom 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, 10.0 mm, and it may be in the range between any two of the numerical values exemplified here. The peripheral wall 4b1 preferably has a portion parallel to the axial direction. The portion parallel to the axial direction preferably has a length from the lower surface 4b4 within the above numerical range. Further, the peripheral wall 4b1 is preferably parallel to the axial direction throughout the entire portion between the lower surface 4b4 and the lower surface 4m3.

[0023] At the open end 3a of the outer shell 3, a base surface 3a1, an annular convex portion 3a2, and an inner bag support surface 3a3 are provided. The base surface 3a1 is preferably annular. The annular convex portion 3a2 is disposed inside the base surface 3a1 and protrudes axially from the base surface 3a1. Preferably, as shown in FIGS. 3 to 4, the base surface 3a1 faces the open end 41a1 of the outer cylinder 41a of the mouth mounting member 8, and the annular convex portion 3a2 protrudes toward the inside of the outer cylinder 41a of the mouth mounting member 8. According to such a configuration, even if the contents inside the inner bag 4 enter the gap 44 between the base surface 3a1 and the open end 41a1, the annular convex portion 3a2 suppresses the contents from entering between the inner bag 4 and the outer shell 3. Further, it is preferable that the apex 3a4 of the annular convex portion 3a2 is at a position higher than the open end 41a1. In this case, the intrusion of the contents is further suppressed.

[0024] The inner bag support surface 3a3 is a surface with which the lower wall 4b2 abuts. The inner bag support surface 3a3 is preferably annular. When the lower wall 4b2 abuts on the inner bag support surface 3a3, the inner bag 4 is supported by the outer shell 3, and the inner bag 4 is suppressed from entering the outer shell 3. The inner bag support surface 3a3 is disposed inside the base surface 3a1 and the annular convex portion 3a2. The inner bag support surface 3a3 is preferably provided at a position lower than the base surface 3a1. In this case, a part of the peripheral wall 4b1 closer to the lower wall 4b2 is covered by the outer shell 3, and inevitably, the lower wall 4b2 and the corner portion 4b3 are also covered by the outer shell 3. Thereby, the corner portion 4b3 having relatively low impact resistance is protected by the outer shell 3, and the impact resistance of the inner bag 4 is further improved.

[0025] As shown in FIGS. 4 and 6, the inner bag 4 includes an axially engaging portion 4ma and a circumferentially engaging portion 4mb at a protruding portion 4c protruding from the open end 3a of the outer shell 3. As shown in FIGS. 5 and 6, the axially engaging portion 4ma and the circumferentially engaging portion 4mb are provided so as to protrude radially outward from the peripheral wall 4b1. As shown in FIG. 5, a concave portion 4c13 is provided on the inner peripheral surface of the axially engaging portion 4ma. The mouth mounting member 8 is preferably not engaged with the outer shell 3.

[0026] As shown in FIG. 5, the length L2 in the axial direction between the open end 5c of the inner bag 4 and the lower surface 4m3 of the axial engagement portion 4ma is preferably 4.0 to 5.0 mm. In the F-mouth standard, the length L2 is defined as 4.5 mm. By setting the length L2 within the above range, the mouth attachment member 8 compliant with the F-mouth standard can be used. There are various commercially available mouth attachment members 8 compliant with the F-mouth standard, and they are excellent in availability. Specifically, the length L2 is, for example, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0 mm, and it may also be in the range between any two of the values exemplified here.

[0027] The inner bag 4 is provided with an inclined portion 4e and a seal cylinder portion 4f in this order on the side of the open end 5c rather than the lower surface 4m3. As shown in FIGS. 3 to 4, the inner surface of the seal cylinder portion 4f is in close contact with the outer peripheral surface 41b1 of the inner cylinder 41b provided on the mouth attachment member 8. Thereby, leakage of the contents inside the inner bag 4 is suppressed. The inclined portion 4e is configured to reduce the diameter of the axial engagement portion 4ma toward the seal cylinder portion 4f. As shown in FIG. 5, the length L3 in the axial direction between the lower end of the seal cylinder portion 4f and the lower surface 4m3 of the axial engagement portion 4ma is preferably 1.2 to 4.0 mm. By setting the length L3 within this range, it becomes easier to set 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, 4.0 mm, and it may also be in the range between any two of the values exemplified here.

[0028] An enlarged diameter portion 4o is provided at the open end 5c of the inner bag 4, whereby it is easier to insert the inner cylinder 41b into the inner bag 4.

[0029] In the axial direction, the length L4 between the open end 5c and the lower end of the seal cylinder portion 4f, and the length L5 of the seal cylinder portion 4f are preferably 0.5 to 3.3 mm respectively. By setting the lengths L4 and L5 within this range, it becomes easier to set the lengths L2 and L3 within the above range. Specifically, for example, the lengths L4 and L5 are each, 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, 3.3 mm, and may be within the range between any two of the values exemplified herein.

[0030] For the axial engagement portion 4ma, the protruding length L6 from the peripheral wall 4b1 is preferably 0.60 to 1.85 mm. In this case, there is an advantage that it becomes easier to set L2 to L4 within the above range. Specifically, for example, the protruding length L6 is, 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, 1.85 mm, and may be within the range between any two of the values exemplified herein.

[0031] From the perspective of meeting the F-port standard, it is preferable to meet at least one of the following dimensions. · The outer diameter of the axial engagement portion 4ma is 30.5 to 33.8 mm (preferably 31.8 to 33.3 mm, more preferably 32.3 to 33.3 mm. In this embodiment, it is 32.8 mm) · The outer diameter at the open end 5c of the inner bag 4 is 29.0 to 31.0 mm (preferably 29.5 to 30.5 mm. In this embodiment, it is 30.0 mm) · The diameter of the outer peripheral surface of the seal cylinder portion 4f is 28.1 to 30.1 mm (preferably 28.6 to 29.6 mm. In this embodiment, it is 29.1 mm)

[0032] As shown in FIG. 6, on the outer peripheral surface of the inner bag 4 (more specifically, the inner bag main body 4d), a ridge 4g is provided. The lower surface of the ridge 4g is inclined so as to approach the opening end 5c as it proceeds in the counterclockwise direction.

[0033] On the outer peripheral surface of the inner bag 4, a plurality of ridges 4g are provided, and the starting points and ending points of the plurality of ridges 4g are shifted from each other in the circumferential direction. In the present embodiment, two ridges 4g are arranged with a 180-degree shift in the circumferential direction. Further, the angle at which each ridge 4g extends is preferably 180 degrees or less, and more preferably 90 degrees or less. This angle is, for example, 15 to 180 degrees, and preferably 30 to 90 degrees (about 45 degrees in the present 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, 180 degrees, and may be in the range between any two of the numerical values exemplified here.

[0034] On the inner peripheral surface of the outer shell 3, a cam rail 3l is provided. A concave groove 3m engageable with the ridge 4g is provided in a part of the cam rail 3l. The concave groove 3m is preferably provided at the end of the cam rail 3l. The upper surface of the cam rail 3l is inclined so as to approach the opening end 3a as it proceeds in the counterclockwise direction. The ridge 4g and the concave groove 3m are configured to be engageable by rotating the inner bag 4 clockwise with respect to the outer shell 3, and to be disengageable by rotating the inner bag 4 counterclockwise with respect to the outer shell 3. The concave groove 3m is formed as a non-through hole. In this case, compared with the case where the concave groove 3m is formed as a through hole, it is less likely for the outer shell 3 to crack.

[0035] On the inner peripheral surface of the outer shell 3, a plurality of cam rails 3l are provided, and the starting points and ending points of the plurality of cam rails 3l are shifted from each other in the circumferential direction. In the present embodiment, two cam rails 3l are arranged with a 180-degree shift in the circumferential direction. Also, the angle through which each cam rail 3l extends is preferably 360 degrees or less, and more preferably 270 degrees or less. This angle is, for example, 90 to 360 degrees, and preferably 120 to 240 degrees (180 degrees in the present 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, and may be within the range between any two of the numerical values exemplified herein.

[0036] The concave strip 3m is preferably provided on each cam rail 3l. The explanation of the angle through which the concave strip 3m extends is the same as the explanation of the angle for the convex strip 4g described above.

[0037] It is preferable that the container body 2 is provided with a rotation restricting structure for restricting the relative rotation of the inner bag 4 and the outer shell 3. Examples of this rotation restricting structure include a structure for increasing the frictional force between the inner bag 4 and the outer shell 3 and a structure for engaging the inner bag 4 and the outer shell 3 in a concave-convex manner in the circumferential direction.

[0038] Before the inner bag 4 is pulled out from the container body 2, the lower surface of the convex strip 4g abuts against the upper surface of the cam rail 3l within the concave strip 3m. The convex strip 4g and the cam rail 3l constitute a cam mechanism 31. When the inner bag 4 is rotated counterclockwise with respect to the outer shell 3, the inner bag 4 is displaced in a direction to pull out from the container body 2 by 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 a right-handed screw.

[0039] As shown in FIGS. 5 to 6, first and second flange portions 3f1 and 3f2 are provided in order on the outer peripheral surface of the outer shell 3 from the opening end 3a side of the outer shell 3. The cam mechanism 31 is preferably arranged such that the lower end of the cam mechanism 31 is positioned 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 formed by biaxially stretch blow molding the preform 15 shown in FIGS. 10 to 11, and the second flange portion 13f2 and the cam mechanism 15g of the preform 15 become the second flange portion 3f2 and the cam mechanism 31 of the container body 2 after molding. The cam mechanism 15g is composed of the rib 14g of the inner preform 14 and the cam rail 13l of the outer preform 13. Since the bottom 15c side of the preform 15 is heated and mainly stretched rather than the lower surface 13f3 of the second flange portion 13f2, by arranging the cam mechanism 15g at a position closer to the opening end 13d of the outer preform 13 than the lower surface 13f3 of the second flange portion 13f2, the shape of the cam mechanism 15g provided on the preform 15 is suppressed from collapsing during molding. Similarly, the concave groove 3m and the convex strip 4g, and the portions corresponding to the concave groove 3m and the convex strip 4g in the preform 15 are preferably arranged at positions closer to the opening ends 3a and 13d than the lower surfaces 3f3 and 13f3 of the second flange portions 3f2 and 13f2.

[0040] As shown in FIG. 5, the first flange portion 3f1 is configured such that the opening end 3a has an enlarged diameter. Preferably, a concave portion 3g is provided on the inner peripheral surface of the first flange portion 3f1. The lower surface of the concave portion 3g serves as the inner bag support surface 3a3. In the F-mouth standard, it is specified that the axial length from the opening end 5c of the container body 2 to the lower surface of the support ring that supports the mouth portion 5 when the mouth portion mounting member 8 is mounted is 10.2 mm. Therefore, if an attempt is made to comply with the F-mouth cap standard by providing one flange portion on the outer shell 3, it is necessary to provide the flange portion at a position such as the opening end 3a or a position adjacent thereto like the first flange portion 3f1. In that case, heat is likely to be applied to the cam mechanism 15g provided on the preform 15 during molding, and the shape of the cam mechanism 15g is likely to collapse during molding. On the other hand, in the present embodiment, since the first and second flange portions 3f1 and 3f2 are provided, the shape of the cam mechanism 15g provided on the preform 15 is suppressed from collapsing during molding. The first flange portion 3f1 is provided as a support ring, and it is preferable that the first flange portion 3f1 does not engage with the mouth portion mounting member 8.

[0041] The length L7 between the lower surfaces of the first and second flange portions 3f1 and 3f2 in the axial direction is, for example, 3 to 9 mm, and preferably 4.5 to 7.5 mm (in this embodiment, it is 6 mm). 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, 9.0 mm, and it may be within the range between any two of the values exemplified here.

[0042] <Detailed Configuration of the Mouth Port Mounting Member 8> The mouth portion mounting member 8 will be described in detail with reference to FIGS. 3 to 4 and FIGS. 7 to 9. The mouth portion mounting member 8 is engaged with the inner bag 4 in the axial direction. Therefore, by pulling the mouth portion mounting member 8, the inner bag 4 can be pulled out. As shown in FIG. 4, the mouth portion mounting member 8 preferably has a discharge port 8d for discharging the contents inside the inner bag 4. Further, the mouth portion mounting member 8 preferably includes a nozzle 8c.

[0043] The mouth-attached member 8 includes a main body member 41 and an opening / closing member 42. When the mouth-attached member 8 is the cap 8a, the main body member 41 is the cap body, and the opening / closing member 42 is the overcap. The main body member 41 is axially engaged with the inner bag 4 and has a discharge port 8d that communicates with the inside of the inner bag 4. The opening / closing member 42 is configured to be able to open and close the discharge port 8d. Fig. 3 shows the closed state in which the discharge port 8d is closed. By removing the opening / closing member 42 from the main body member 41, the discharge port 8d can be brought into an open state. In the present embodiment, the main body member 41 and the opening / closing member 42 are not connected, but they may be connected to each other by a hinge. The opening / closing member 42 is preferably engageable with the main body member 41 by an engagement structure such as a screw or a snap fit.

[0044] As shown in Fig. 4, the main body member 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 in the upper wall 41d, and the flow paths of the inner cylinder 41b and the nozzle 8c are connected through the flow hole 41i. Preferably, the communication hole 41i is sealed with a closing member (not shown) before use, and the contents can flow through the flow hole 41i by removing the closing member during use. The tip of the nozzle 8c becomes the discharge port 8d. The inner cylinder 41b is inserted into the protruding portion 4c and adheres to the inner surface 4f1 of the seal cylinder portion 4f. For this reason, the inner cylinder 41b and the seal cylinder portion 4f are frictionally engaged in the circumferential direction. An engaging portion 8b is provided on the inner peripheral surface of the outer cylinder 41a. Preferably, an anti-slip shape is provided on the outer peripheral surface 41j of the outer cylinder 41a. In this case, since it becomes easier to grip the outer peripheral surface 41j and rotate the main body member 41, it is possible to suppress the rotation of the opening / closing member 42 instead of the main body member 41 when pulling out the inner bag 4 while rotating it. Examples of the method of providing 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 (for example, 6 to 12-sided) in plan view.

[0045] The opening / closing member 42 includes an outer cylinder 42a, an inner cylinder 42b, and an upper wall 42d. The outer cylinder 42a constitutes the outer peripheral surface of the opening / closing member 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 is not provided with a discharge port for discharging the contents inside the inner bag 4.

[0046] When the discharge port 8d is closed by the opening / closing member 42, the inner cylinder 42b is inserted into the nozzle 8c of the main body member 41 and is in close contact with the inner surface of the nozzle 8c. Further, the bottom surface of the outer cylinder 42a abuts against the upper wall 41d of the main body member 41. From this state, by gripping 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 to open the discharge port 8d.

[0047] As shown in FIGS. 4 and 7 to 9, the mouthpiece attachment member 8 is provided with an easy-opening formation portion 50 having a structure that facilitates the formation of an opening 51 communicating with the inside of the inner bag 4. The easy-opening formation portion 50 is provided on the opening / closing member 42. Examples of the structure constituting the easy-opening formation portion 50 include a structure for tearing a weakened portion 8e and a structure for removing a lid portion for closing the opening 51. The formation of the opening 51 in the easy-opening formation portion 50 is preferably performed without using tools or using tools (chopsticks or straws) used for eating. Further, the formation of the opening 51 is preferably performed without using power other than human power. The weakened portion 8e is a portion weakened to facilitate tearing, and can be configured by thinning or using a material with low rigidity.

[0048] In the present embodiment, as shown in FIGS. 7 to 9, the easy-opening formation portion 50 includes a weakened portion 8e provided on the opening / closing member 42 and a protrusion 8f provided adjacent to the weakened portion 8e. The lower side of the protrusion 8f is a cavity 53. The easy-opening formation portion 50 is configured to be able to form the opening 51 by tearing the weakened portion 8e and communicating the cavity 53 with the outside when the protrusion 8f is pushed down. According to such a configuration, the opening 51 can be formed by pushing down the protrusion 8f with a finger or the like.

[0049] More specifically, a recess 42e is provided in the upper wall 42d of the opening / closing member 42, and the weakened portion 8e and the protrusion 8f are disposed within the recess 42e. The recess 42e has a depth such that the protrusion 8f does not protrude from the recess 42e. Thus, the protrusion 8f does not get in the way when the double container 1 is in use. Also, as shown in FIG. 4, a protective seal 52 that covers the recess 42e may be provided so that the protrusion 8f is not accidentally knocked down when the double container 1 is in use. The protrusion 8f can be knocked down after peeling off the protective seal 52. Also, as shown in FIGS. 7 to 8, a recess 42f may be provided so as to surround the recess 42e. The recess 42f is formed shallower than the recess 42e, and the protective seal 52 can be disposed within the recess 42f. Thereby, it becomes difficult for a finger to touch the edge of the protective seal 52, and accidental peeling of the protective seal 52 is suppressed. The depth of the recess 42f is preferably equal to the thickness of the protective seal 52. In this case, the upper surface of the protective seal 52 and the upper surface around the recess 42f are flush.

[0050] As shown in FIGS. 7 to 8, the bottom surface of the protrusion 8f has a rectangular shape with rounded corners, and the weakened portion 8e is provided so as to surround three sides of the protrusion 8f. Then, by knocking down the protrusion 8f with the remaining one side where the weakened portion 8e is not provided as a hinge portion 8g, the weakened portion 8e can be torn to form the opening 51. The weakened portion 8e only needs to have a tearable thickness, for example, 0.5 mm or less, and preferably 0.3 mm or less. This thickness is, for example, 0.01 to 0.5 mm, and specifically, for example, 0.01, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5 mm, and may be in the range between any two of the values exemplified herein. The weakened portion 8e is preferably formed by providing a groove 8h around the protrusion 8f.

[0051] <Mounting of the mouthpiece mounting member 8> As shown in FIGS. 3 to 4, the mouthpiece mounting member 8 can be mounted on the mouthpiece 5 while supporting the first flange portion 3f1. The mouthpiece mounting member 8 is preferably of a plugging type. With the first flange portion 3f1 supported, when the mouthpiece mounting member 8 is placed over the protruding portion 4c and a downward force is applied to the mouthpiece mounting member 8 in that state, the engaging portion 8b gets over the axial engaging portion 4ma, and the engaging portion 8b engages with the axial engaging portion 4ma and the circumferential engaging portion 4mb, so that the mouthpiece mounting member 8 can be mounted on the mouthpiece 5.

[0052] <Withdrawal of the inner bag 4> The mouthpiece mounting member 8 is engaged with the mouthpiece 5 of the inner bag 4 in the circumferential direction and the axial direction, and is configured such that the inner bag 4 rotates with respect to the outer shell 3 as the mouthpiece mounting member 8 rotates. Then, due to the action of the cam mechanism 31 provided between the inner bag 4 and the outer shell 3, the inner bag 4 is configured to move in a direction of coming out of the container body 2 as the inner bag 4 rotates.

[0053] According to such a configuration, by rotating the mouthpiece mounting member 8, the inner bag 4 can be moved in a direction of coming out of the container body 2 while being twisted. After that, by pulling the mouthpiece mounting member 8, the inner bag 4 can be pulled out of the container body 2.

[0054] Before pulling out the inner bag 4, by forming an opening 51 communicating with the inside of the inner bag 4 in the mouthpiece mounting member 8 at the easy-opening forming portion 50, it is suppressed that the inner bag 4 becomes difficult to be pulled out due to the air in the inner bag 4. When pulling out the inner bag 4, it is not essential to rotate the inner bag 4 with respect to the outer shell 3, and the inner bag 4 may be pulled out of the container body 2 by pulling the inner bag 4 along the axial direction without rotating the inner bag 4 with respect to the outer shell 3. In this case, the mouthpiece mounting member 8 only needs to be axially engaged with the inner bag 4 and does not need to be circumferentially engaged.

[0055] 1-2. Manufacturing method of the double container 1 The container body 2 can be manufactured by biaxially stretching and blow molding the preform 15 shown in FIG. 11. Further, the double container 1 can be manufactured by attaching the mouth - mounting member 8 to the container body 2.

[0056] <Configuration of Inner Preform 14, Outer Preform 13, and Preform 15> As shown in FIG. 10, the preform 15 includes an inner preform 14 that serves as an inner bag 4 and an outer preform 13 that serves as an outer shell 3.

[0057] As shown in FIG. 10, the inner preform 14 has a bottomed cylindrical shape and includes a mouth portion 14a, a body portion 14b, and a bottom portion 14c. The bottom portion 14c is provided so as to close the lower end of the body portion 14b. The outer preform 13 has a bottomed cylindrical shape and includes a mouth portion 13a, a body portion 13b, and a bottom portion 13c. The bottom portion 13c is provided so as to close the lower end of the body portion 13b.

[0058] As shown in FIG. 11, the preform 15 can be formed by covering the inner preform 14 with the outer preform 13. In the preform 15, the mouth portion 14a and the mouth portion 13a face each other, and the body portion 14b and the body portion 13b face each other.

[0059] The mouth portions 13a and 14a become the mouth portion 15a of the preform 15, the body portions 13b and 14b become the body portion 15b of the preform 15, and the bottom portions 13c and 14c become the bottom portion 15c of the preform 15. The body portion 15b and the bottom portion 15c are mainly stretched in the biaxial stretch blow molding. The mouth portion 15a hardly deforms during molding and becomes the mouth portion 5 of the container body 2. The above - described content regarding the configuration included in the mouth portion 5 is applicable to the configuration included in the mouth portion 15a as long as it does not go against the gist.

[0060] <Materials and Manufacturing Methods of Inner Preform 14, Outer Preform 13, and Preform 15> The inner preform 14 and the outer preform 13 can be formed by direct blow molding or injection molding using a thermoplastic resin such as polyester (e.g., PET) or polyolefin (e.g., polypropylene, polyethylene).

[0061] The outer preform 13 is preferably formed by injection molding. The inner preform 14 is preferably formed by direct blow molding using a molten tubular parison. When the inner preform 14 is formed by direct blow molding, a structure in which the concave portion 4c13 is formed on the inner peripheral surface of the axial engagement portion 4ma can be obtained. The inner preform 14 preferably has a multilayer structure.

[0062] 2. Second Embodiment The second embodiment of the present invention will be described with reference to FIGS. 12 to 13. This embodiment is similar to the first embodiment, and the contents described in the first embodiment are applicable to this embodiment as long as they do not conflict with the gist thereof. 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 the differences.

[0063] In this embodiment, as shown in FIGS. 12 to 13, the easy-opening forming portion 50 includes a weakened portion 8e provided on the opening / closing member 42 and a protrusion 8f provided adjacent to the weakened portion 8e. The lower side of the protrusion 8f is a cavity 53. The easy-opening forming portion 50 is configured to be able to form the opening 51 by tearing the weakened portion 8e when the protrusion 8f is pushed into the cavity 53. According to such a configuration, the opening 51 can be formed by pushing the protrusion 8f with a finger or the like.

[0064] Also in this embodiment, the weakened portion 8e and the protrusion 8f are disposed in the recess 42e provided in the upper wall 42d. Since the protrusion 8f in this embodiment can be made lower than that in the first embodiment, the recess 42e can also be made shallower than that in the first embodiment.

[0065] As shown in Fig. 12, the bottom surface of the protrusion 8f is circular, a hinge portion 8g is provided at a part of the outer periphery of the protrusion 8f, and a weakened portion 8e is provided at a portion other than the hinge portion 8g. When the protrusion 8f is pressed, the weakened portion 8e is torn while the protrusion 8f rotates about the hinge portion 8g, and the opening 51 is formed. Preferably, as shown in Fig. 13A, the hinge portion 8g has a larger wall thickness than the weakened portion 8e, and each of the outer surface and the inner surface of the hinge portion 8g has a curved shape.

[0066] 3. Third Embodiment The third embodiment of the present invention will be described with reference to Figs. 14 to 15. This embodiment is similar to the first to second embodiments, and the contents described in the first to second embodiments are also applicable to this embodiment unless they are contrary to the gist thereof. The main difference of this embodiment from the first to second embodiments lies in the structure of the opening / closing member 42. Hereinafter, the description will be centered on the differences.

[0067] In this embodiment, as shown in Figs. 14 to 15, the easy-opening forming portion 50 includes a pressing portion 8i provided on the opening / closing member 42. The lower side of the pressing portion 8i is a cavity 53. The pressing portion 8i is provided adjacent to the weakened portion 8e. The easy-opening forming portion 50 is configured to be able to form the opening 51 by pressing the tip 54a of the opener 54 against the pressing portion 8i and pushing the opener 54 into the cavity 53 to tear the weakened portion 8e. As the opener 54, one that can form the opening 51 by manually pressing the pressing portion 8i can be used, and for example, it is preferable to use tools (chopsticks or straws) used for eating.

[0068] The pressing portion 8i is disposed in a recess 42e provided in the upper wall 42d. Since the pressing portion 8i does not need to protrude upward unlike the protrusion 8f, the recess 42e can be made shallower than in the first to second embodiments.

[0069] As shown in FIG. 14, the pressing portion 8i is circular, a hinge portion 8g is provided at a part of the outer periphery of the pressing portion 8i, and a weakened portion 8e is provided at a portion other than the hinge portion 8g. The weakened portion 8e is preferably formed by providing a groove 8h around the pressing portion 8i. When the pressing portion 8i is pressed by the tip 54a of the opening tool 54, the weakened portion 8e is torn while the pressing portion 8i rotates about the hinge portion 8g, and the opening 51 is formed.

[0070] In addition, in a modification of the third embodiment, as shown in FIG. 16, the pressing portion 8i is constituted by the weakened portion 8e. In this case, when the pressing portion 8i is pressed by the tip 54a of the opening tool 54, the weakened portion 8e is torn, and the opening 51 is formed.

[0071] 4. Fourth Embodiment The fourth embodiment of the present invention will be described with reference to FIGS. 17 to 21. This embodiment is similar to the first embodiment, and the content described in the first embodiment is applicable to this embodiment as long as it does not conflict with the gist thereof. The main difference of this embodiment from the first embodiment lies in the structure of the opening / closing member 42. Hereinafter, the description will be centered on the differences.

[0072] In this embodiment, as shown in FIGS. 17 to 21, the easy-opening formation portion 50 includes a lid portion 8j provided on the opening / closing member 42. As shown in FIG. 20, the lid portion 8j is connected at a connection portion 8k to the peripheral wall of a cavity 53 provided below the lid portion 8j. As shown in FIG. 21, the easy-opening formation portion 50 is configured to be able to form the opening 51 by gripping and pulling up a gripping portion 8l provided on the lid portion 8j to tear the connection portion 8k and expose the cavity 53.

[0073] As shown in FIGS. 18 to 19, the connecting portion 8k includes an annular portion 8k1 provided at the edge of the cavity 53 and a linear portion 8k2 connected to the annular portion 8k1. The linear portion 8k2 is preferably linear. Further, the annular portion 8k1 is preferably provided between a pair of linear portions 8k2. In this case, a tear starting at the end of the linear portion 8k2 can be transmitted to the annular portion 8k1 to tear the annular portion 8k1. The connecting portion 8k includes a tear stop portion 8k3 having a wider line width than the annular portion 8k1 and the linear portion 8k2. A tear starting at one end 8k4 of the linear portion 8k2 proceeds via the annular portion 8k1 and stops at the tear stop portion 8k3. Thereby, separation of the lid portion 8j from the upper wall 42d is suppressed.

[0074] As shown in FIGS. 18 and 20, preferably, a base 8m is provided on the upper wall 42d, and the connecting portion 8k is provided between the base 8m and the lid portion 8j. The base 8m has an inclined surface 8m1 inclined such that the width of the base 8m becomes narrower toward the connecting portion 8k. The inclined surface 8m1 and the lower surface 8j3 of the lid portion 8j intersect at an acute angle. Therefore, when a peeling force is applied to the lid portion 8j, tearing of the connecting portion 8k is likely to start at the intersection of the inclined surface 8m1 and the lower surface 8j3.

[0075] As shown in FIGS. 19 and 21, at the end of the lid portion 8j on the side of one end 8k4 of the linear portion 8k2, this end is not connected to the base 8m and serves as a gripping portion 8l. The distance between the lid portion 8j and the upper wall 42d widens toward one end 8j1 of the lid portion 8j at the gripping portion 8l, facilitating gripping of the gripping portion 8l.

[0076] 5. Fifth Embodiment The fifth embodiment of the present invention will be described with reference to FIG. 22. This embodiment is similar to the first embodiment, and the content described in the first embodiment is applicable to this embodiment as long as it does not conflict with the gist thereof. The main difference between this embodiment and the first embodiment lies in the structure of the mouth attachment member 8. Hereinafter, the description will focus on the differences.

[0077] In the first embodiment, the outer cylinder 41a of the main body member 41 and the outer cylinder 42a of the opening / closing member 42 had the same diameter and there was no step between the two. Such a form is preferable from the viewpoint of appearance. However, when rotating the mouthpiece mounting member 8 to pull out the inner bag 4, there is a problem that, although the main body member 41 and the opening / closing member 42 should be rotated together, the opening / closing member 42 may be erroneously rotated alone. In order to suppress the occurrence of such a problem, in this embodiment, the diameter of the outer cylinder 41a of the main body member 41 is made larger than the diameter of the outer cylinder 42a of the opening / closing member 42. In this case, the main body member 41 is provided with an exposed portion 41a2 that is not covered by the lower end 42a1 of the outer cylinder 42a and is exposed to the outside. According to such a configuration, when the mouthpiece mounting member 8 is pinched with a finger to rotate the mouthpiece mounting member 8, the pressure with which the finger is pressed against the outer cylinder 41a of the main body member 41 increases. Therefore, when trying to rotate the mouthpiece mounting member 8, the main body member 41 is naturally more likely to rotate, and the occurrence of the above problem is suppressed. 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 member 41. In this case, the main body member 41 becomes even more likely to rotate.

[0078] 6. Sixth Embodiment The sixth embodiment of the present invention will be described with reference to FIGS. 23 to 24. This embodiment is similar to the fifth embodiment, and the content described in the fifth embodiment is applicable to this embodiment as long as it does not conflict with the gist thereof. The main difference between this embodiment and the fifth embodiment lies in the structure of the mouthpiece mounting member 8. Hereinafter, the description will focus on the differences.

[0079] In the fifth embodiment, the exposed portion 41a2 was formed by expanding the diameter of the outer cylinder 41a of the main body member 41. However, in this embodiment, without changing the shape of the main body member 41, the exposed portion 41a2 is formed by reducing the diameter of the outer periphery of the lower end 42a1 of the outer cylinder 42a of the opening / closing member 42. In the exposed portion 41a2, the main body member 41 is not covered by the lower end 42a1. In the exposed portion 41a2, a step is provided between the main body member 41 and the opening / closing member 42. In this embodiment, a plurality of (eight in this embodiment) diameter-reduced portions 42a2 are intermittently provided at the lower end 42a1, but the diameter-reduced portions 42a2 may be provided on the entire circumference of the lower end 42a1. In this embodiment, the diameter-reduced portions 42a2 are formed by reducing the wall thickness of the outer cylinder 42a, but without changing the wall thickness, the outer cylinder 42a may protrude inward by the depth of the diameter-reduced portions 42a2. Also in this embodiment, similar to the fifth embodiment, the occurrence of the problem that the opening / closing member 42 alone may rotate can be suppressed. Note that the diameter-reduced portions 42a2 may extend up to the upper end of the outer cylinder 42a.

[0080] 7. Seventh Embodiment The seventh embodiment of the present invention will be described with reference to FIGS. 25 to 26. This embodiment is similar to the sixth embodiment, and the content described in the sixth embodiment is applicable to this embodiment as long as it does not conflict with the gist thereof. The main difference between this embodiment and the sixth embodiment lies in the structure of the mouth attachment member 8. Hereinafter, the description will focus on the differences.

[0081] In the sixth embodiment, the exposed portion 41a2 was formed by reducing the diameter of the outer periphery of the lower end 42a1 of the outer cylinder 42a of the opening / closing member 42. However, in this embodiment, the exposed portion 41a2 is formed by providing a missing portion 42a3 at 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, a plurality of (eight in this embodiment) missing portions 42a3 are intermittently provided at the lower end 42a1, but the missing portions 42a3 may be provided on the entire circumference of the lower end 42a1. Also in this embodiment, similar to the fifth embodiment, the occurrence of the problem that the opening / closing member 42 alone may rotate can be suppressed. Explanation of Reference Numerals

[0082] 1: Double container 2: Container body 3: Outer shell 3a: Open end 3a1: Base surface 3a2: Annular convex part 3a3: Inner bag support surface 3a4: Vertex 3f1: First flange part 3f2: Second flange part 3f3: Bottom surface 3f4: Central surface 3f5: Top surface 3g: Concave part 3l: Cam rail 3m: Concave stripe 4: Inner bag 4a: First cylinder 4b: Second cylinder 4b1: Peripheral wall 4b2: Bottom wall 4b3: Corner part 4b4: Bottom surface 4c: Protrusion 4c13: Concave part 4c2: Engagement convex part 4c5: Annular convex part 4c8: Tapered surface 4d: Inner bag body 4e: Inclined part 4f: Seal cylinder part 4f1: Inner surface 4g: Convex stripe 4m3: Bottom surface 4ma: Axial engagement part 4mb: Circumferential engagement part 4o: Diameter-expanded part 5: Mouth part 5c: Open end 6: Barrel part 6b: Shoulder part 6c: Barrel body 7: Bottom part 8: Mouth part mounting member 8a: Cap 8b: Engagement part 8b3: Annular convex part 8b4: Tip 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: Gripping part 8m: Base 8m1: Inclined surface 13: Outer preform 13a: Mouth part 13b: Body part 13c: Bottom part 13d: Open end 13f2: Second flange part 13f3: Lower surface 13l: Cam rail 14: Inner preform 14a: Mouth part 14b: Body part 14c: Bottom part 14g: Rib 15: Preform 15a: Mouth part 15b: Body part 15c: Bottom part 15g: Cam mechanism 31: Cam mechanism 41: Body member 41a: Outer cylinder 41a1: Open end 41a2: Exposed part 41b: Inner cylinder 41b1: Outer peripheral surface 41d: Upper wall 41i: Flow-through hole 41j: Outer peripheral surface 42: Opening and closing member 42a: Outer cylinder 42a1: Lower end 42a2: Reduced diameter portion 42a3: Missing portion 42b: Inner cylinder 42d: Upper wall 42e: Recess 42f: Recess 44: Gap 50: Easy-opening formation portion 51: Opening 52: Protection seal 53: Cavity 54: Opening tool 54a: Tip C: Central axis α: Angle

Claims

1. A double container comprising a container body and a mouthpiece mounting member mounted on the mouth of the container body, wherein the container body includes an inner bag and an outer shell disposed so as to cover the inner bag, when the direction in which the central axis of the mouth of the container body extends is defined as the axial direction, the mouthpiece mounting member includes a main body member and an opening / closing member, the main body member is engaged with the inner bag in the axial direction and has a discharge port communicating with the inside of the inner bag, the opening / closing member is configured to be able to open and close the discharge port, the opening / closing member is provided with an easy-opening formation portion having a structure that facilitates the formation of an opening communicating with the inside of the inner bag. A double container.

2. The double container according to claim 1, wherein the opening / closing member includes an outer cylinder constituting the outer peripheral surface of the opening / closing member, the main body member is provided with an exposed portion that is exposed to the outside without being covered by the lower end of the outer cylinder. A double container.

3. The double container according to claim 1 or claim 2, wherein the easy-opening formation portion includes a weakened portion provided on the opening / closing member and a protrusion provided adjacent to the weakened portion, a cavity is provided below the protrusion, the easy-opening formation portion is configured to be able to form the opening by tearing the weakened portion when the protrusion is tilted to communicate the cavity with the outside. A double container.

4. The double container according to claim 1 or claim 2, wherein the easy-opening formation portion includes a weakened portion provided on the opening / closing member and a protrusion provided adjacent to the weakened portion, a cavity is provided below the protrusion, the easy-opening formation portion is configured to be able to form the opening by tearing the weakened portion when the protrusion is pushed into the cavity. A double container.

5. The double container according to claim 1 or claim 2, wherein the easy-opening formation portion includes a pressing portion provided on the opening / closing member, a cavity is provided below the pressing portion, the pressing portion is constituted by a weakened portion or is provided adjacent to the weakened portion, the easy-opening formation portion is configured to be able to form the opening by tearing the weakened portion by pressing the tip of an opening tool against the pressing portion and pushing the opening tool into the cavity. A double container.

6. The double container according to claim 1 or claim 2, wherein the easy-opening formation portion includes a lid portion provided on the opening / closing member, the lid portion is connected at a connecting portion to the peripheral wall of a cavity provided below the lid portion. The double container is configured such that the easy-opening formation part can form the opening by tearing the connecting part to expose the cavity by gripping and pulling up the gripping part provided on the lid part. **Claim 7** A double container including a container body and a mouth part mounting member mounted on the mouth part of the container body, wherein the container body includes an inner bag and an outer shell disposed so as to cover the inner bag, when the direction in which the central axis of the mouth part of the container body extends is defined as the axial direction, the mouth part mounting member includes a main body member and an opening / closing member, the main body member is engaged with the inner bag in the axial direction and has a discharge port communicating with the inside of the inner bag, the opening / closing member is configured to be able to open and close the discharge port, the opening / closing member includes an outer cylinder constituting the outer peripheral surface of the opening / closing member, and the main body member is provided with an exposed part that is exposed to the outside without being covered by the lower end of the outer cylinder.

Images