Container

Abstract

To provide a container capable of introducing a rotation regulation structure while enhancing a degree of freedom in selecting a mouth part attachment member.SOLUTION: According to the present invention, there is provided a container, the container comprising a container body, and a mouth part attachment member attached to a mouth part of the container body. The mouth part attachment member is constituted so as to be attached to the mouth part at a plugging type. The container body comprises an axial direction engagement part for engaging with the mouth part attachment member in an axial direction, and a circumferential direction engagement part for engaging with the mouth part attachment member in a circumferential direction. The axial direction is a direction where a central axis of the mouth part extends. The circumferential direction is a rotation direction with the central axis as a center. The circumferential direction engagement part is arranged at a position farther away from an opening end of the mouth part than the axial direction engagement part. The mouth part attachment member comprises an engagement part. The engagement part of the mouth part attachment member engages with the axial direction engagement part in the axial direction, and engages with the circumferential direction engagement part in the circumferential direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a container.

Background Art

[0002] Patent Document 1 discloses a configuration in which a discharging member is engaged with a portion protruding from an outer layer body in an inner layer body of a double container.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In Patent Document 1, the rotation of the discharging member in the circumferential direction is restricted by engaging a rotation-preventing rib provided on the discharging member with a vertical rib provided on the inner layer body in the circumferential direction.

[0005] Such a rotation restricting structure is premised on using a discharging member with a specific structure, and a generally circulated discharging member cannot be used.

[0006] The present invention has been made in view of such circumstances, and provides a container capable of introducing a rotation restricting structure while increasing the degree of freedom in selecting a mouth portion mounting member.

Means for Solving the Problems

[0007] According to the present invention, the following inventions are provided. [1] A container including a container body and a mouth portion mounting member mounted on the mouth portion of the container body, wherein the mouth portion mounting member is configured to be mounted on the mouth portion in a plugging manner, the container body includes an axial engagement portion that axially engages with the mouth portion mounting member and a circumferential engagement portion that circumferentially engages with the mouth portion mounting member, the axial direction is the direction in which the central axis of the mouth portion extends, the circumferential direction is the rotational direction centered on the central axis, the circumferential engagement portion is disposed at a position farther from the opening end of the mouth portion than the axial engagement portion, the mouth portion mounting member includes an engagement portion, and the engagement portion of the mouth portion mounting member axially engages with the axial engagement portion and circumferentially engages with the circumferential engagement portion. [2] The container according to [1], wherein the circumferential engagement portion includes a plurality of engagement convex portions spaced apart along the circumferential direction. [3] The container according to [1] or [2], wherein the axial engagement portion includes an annular convex portion. [4] The container according to any one of [1] to [3], wherein the container body includes an inner bag and an outer shell disposed to cover the inner bag, the inner bag includes a protruding portion protruding from the opening end of the outer shell, and the axial engagement portion and the circumferential engagement portion are provided on the protruding portion. [5] The container according to any one of [1] to [4], wherein the mouth portion mounting member includes an outer cylinder, and the engagement portion is provided on the inner circumferential surface of the outer cylinder. [Effect of the Invention]

[0008] In the container of the present invention, the circumferential engagement portion is disposed at a position farther from the opening end of the mouth portion than the axial engagement portion, and the engagement portion provided on the mouth portion mounting member is configured to engage with the circumferential engagement portion and the axial engagement portion. In this configuration, a rotation restricting structure is formed by the engagement of the engagement portion of the mouth portion mounting member with the circumferential engagement portion. Since the engagement portion of the mouth portion mounting member is a portion that exists in substantially all plugging-type mouth portion mounting members, according to the present invention, a rotation restricting structure can be introduced while increasing the degree of freedom in the selection of the mouth portion mounting member. [Brief Description of the Drawings]

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described. The 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 arbitrary elements and thus can be omitted.

[0011] 1. First Embodiment With reference to FIGS. 1 to 10, the container 1 of the first embodiment of the present invention will be described. Terms related to directions such as "up" and "down" in the following description mean the directions in a state where the bottom 7 is grounded. Also, in the following description, the "axial direction" 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 centered on the central axis C of the mouth portion 5, for example, the direction in which the inner bag 4 is rotated relative to the outer shell 3 at the mouth portion 5. "Clockwise" and "counterclockwise" are the directions as viewed from the upper side of the container 1 unless otherwise specified.

[0012] 1-1. Configuration of Container 1 As shown in FIG. 1, the container 1 of the first embodiment of the present invention includes a container body 2 and a mouth mounting member 8. In this embodiment, the container 1 is a double container, and the container body 2 includes an inner bag 4 and an outer shell 3. However, the rotation restricting structure of this embodiment is also applicable when the container 1 is a single container. Hereinafter, each configuration will be described in detail.

[0013] <Basic Configuration of 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.

[0014] The body portion 6 is disposed adjacent to the mouth portion 5 on the side away from the opening end 5c of the mouth portion 5. The body portion 6 has a larger outer diameter than the mouth portion 5 (in this specification, the "outer diameter" means the equivalent diameter of a circle when the cross-section is not circular). 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 portion main body 6c on the bottom portion 7 side with respect to the shoulder portion 6b. The body portion main body 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, for example.

[0015] 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 body 4d other than the protruding portion 4c of the inner bag 4 is 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.

[0016] <Engagement Structure between Container Body 2 and Mouth Mounting Member 8> The mouth mounting member 8 is a member mounted on the mouth portion 5 of the container body 2. The mouth mounting member 8 is a cap 8a in the present embodiment, but may be another member such as a pump. The mouth mounting member 8 is configured to be mounted on the mouth portion 5 in a plugging manner. As shown in FIG. 6, the container body 2 includes an axial engagement portion 4ma that axially engages with the mouth mounting member 8 and a circumferential engagement portion 4mb that circumferentially engages with the mouth mounting member 8. The circumferential engagement portion 4mb is disposed at a position farther from the opening end 5c of the mouth portion 5 than the axial engagement portion 4ma. It is preferable that the container body 2 and the mouth mounting member 8 do not engage with each other at portions other than the axial engagement portion 4ma and the circumferential engagement portion 4mb.

[0017] The mouthpiece mounting member 8 is provided with an engaging portion 8b. The engaging portion 8b is preferably provided on the inner peripheral surface of the outer cylinder 41a of the mouthpiece mounting member 8. The engaging portion 8b is preferably an annular convex portion 8b3. The engaging portion 8b engages axially with the axial engaging portion 4ma and circumferentially with the circumferential engaging portion 4mb. The circumferential engagement between the circumferential engaging portion 4mb and the engaging portion 8b may be a concavo-convex engagement or a frictional engagement. Since the engaging portion 8b is provided at a portion substantially in all plug-type mouthpiece mounting members 8, according to the configuration of the present invention, it is possible to realize a rotation restricting structure between the mouthpiece mounting member 8 and the container body 2 using a plug-type mouthpiece mounting member 8 having substantially any configuration, and the degree of freedom in selecting the mouthpiece mounting member 8 becomes very high. Plug-type mouthpiece mounting members having dimensions and shapes conforming to the F-mouth standard are widely distributed and are excellent in availability.

[0018] As shown in FIG. 6, the axial engaging portion 4ma preferably includes an annular convex portion 4c5, and the circumferential engaging portion 4mb preferably includes a plurality of engaging convex portions 4c2 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 mounting the mouthpiece mounting member 8.

[0019] When the engaging portion 8b overrides the axial engaging portion 4ma and engages with the axial engaging portion 4ma, the state shown in FIG. 3B is obtained. 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. Further, 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.

[0020] <Detailed structure of the outer shell 3 and the inner bag 4> As shown in FIG. 4, the inner bag 4 includes a protruding portion 4c that protrudes 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 an outer diameter larger than that of 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.

[0021] As shown in FIG. 5, the second cylinder 4b includes a peripheral wall 4b1 and a lower 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 disposed such that the lower wall 4b2 abuts against the outer shell 3. By the lower wall 4b2 abutting against the outer shell 3, the inner bag 4 is prevented from entering the outer shell 3. The peripheral wall 4b1 preferably extends parallel to the axial direction. Further, the angle α of the peripheral wall 4b1 with respect to 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 portion 4b3 between the lower 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 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, 10.0 mm, and may be in the range between any two of the values exemplified herein. The peripheral wall 4b1 preferably has a length from the lower surface 4b4 within the above numerical range at a portion parallel to the axial direction, and is preferably parallel to the axial direction between the lower surface 4b4 and the lower surface 4m3.

[0022] 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 attachment member 8, and the annular convex portion 3a2 protrudes toward the inside of the outer cylinder 41a of the mouth attachment 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. Also, 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.

[0023] The inner bag support surface 3a3 is the surface with which the lower wall 4b2 abuts. The inner bag support surface 3a3 is preferably annular. When the lower wall 4b2 abuts against 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 on the side 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 with relatively low impact resistance is protected by the outer shell 3, and the impact resistance of the inner bag 4 is further improved.

[0024] 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 attachment member 8 is preferably not engaged with the outer shell 3.

[0025] 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.

[0026] 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.

[0027] An enlarged diameter portion 4o is provided at the open end 5c of the inner bag 4, thereby facilitating the insertion of the inner cylinder 41b into the inner bag 4.

[0028] 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 can be 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 can also be within the range between any two of the values exemplified here.

[0029] 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 can be 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 can also be within the range between any two of the values exemplified here.

[0030] 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)

[0031] As shown in FIG. 6, on the outer peripheral surface of the inner bag 4 (more specifically, the inner bag body 4d), a rib 4g is provided. The lower surface of the rib 4g is inclined so as to approach the opening end 5c as it advances in the counterclockwise direction.

[0032] On the outer peripheral surface of the inner bag 4, a plurality of ribs 4g are provided, and the starting points and ending points of the plurality of ribs 4g are displaced from each other in the circumferential direction. In the present embodiment, two ribs 4g are arranged with a 180-degree displacement in the circumferential direction. Also, the angle at which each rib 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 it may be in the range between any two of the numerical values exemplified here.

[0033] On the inner peripheral surface of the outer shell 3, a cam rail 3l is provided. In a part of the cam rail 3l, a groove 3m engageable with the rib 4g is provided. The 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 advances in the counterclockwise direction. The rib 4g and the 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 groove 3m is formed as a non-through hole. In this case, compared with the case where the groove 3m is formed as a through hole, the outer shell 3 is less likely to crack.

[0034] 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 displaced from each other in the circumferential direction. In the present embodiment, two cam rails 3l are arranged with a 180-degree displacement in the circumferential direction. Further, the angle at 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 here.

[0035] The concave strip 3m is preferably provided on each cam rail 3l. The explanation of the angle at which the concave strip 3m extends is the same as the explanation of the angle for the convex strip 4g described above.

[0036] 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.

[0037] 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 cam mechanism 31 is constituted by the convex strip 4g and the cam rail 3l. When the inner bag 4 is rotated counterclockwise with respect to the outer shell 3, the inner bag 4 is displaced in the direction of coming out of 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.

[0038] As shown in FIGS. 5 to 6, first and second flange portions 3f1 and 3f2 are provided on the outer peripheral surface of the outer shell 3 in order 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. 8 to 10, 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 a rib 14g of the inner preform 14 and a 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 rib 4g, and the portions corresponding to the concave groove 3m and the convex rib 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.

[0039] As shown in Fig. 5, the first flange portion 3f1 is configured such that the opening end 3a has an enlarged diameter. It is preferable that 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 defined 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 means of a single flange portion provided on the outer shell 3, it is necessary to provide the flange portion at 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.

[0040] 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, 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 also be in the range between any two of the values exemplified here.

[0041] <Detailed Configuration of the Mouth Port Mounting Member 8> As shown in Fig. 4, the mouth portion mounting member 8 preferably has a discharge port 8d for discharging the contents in the inner bag 4. Further, the mouth portion mounting member 8 preferably includes a nozzle 8c.

[0042] The cap 8a preferably includes a cap body 41 and an overcap 42. The cap body 41 is configured to be engageable with the protrusion 4c and includes a discharge port 8d. The overcap 42 is configured to open and close the discharge port 8d. FIG. 3 shows a closed state in which the discharge port 8d is closed, and FIG. 4 shows an open state in which the discharge port 8d is open. In the present embodiment, the cap body 41 and the overcap 42 are connected by a hinge 43, but they may not be connected. The overcap 42 is preferably engageable with the cap body 41 by a screw or a snap fit.

[0043] The cap body 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 circulation hole 41i is provided in the upper wall 41d, and the circulation paths of the inner cylinder 41b and the nozzle 8c are connected through the circulation hole 41i. The tip of the nozzle 8c serves as the discharge port 8d. The inner cylinder 41b is inserted into the protrusion 4c and is in close contact with the inner surface 4f1 of the seal cylinder portion 4f. For this reason, the inner cylinder 41b and the seal cylinder portion 4f are in frictional engagement in the circumferential direction. An engaging portion 8b is provided on the inner peripheral surface of the outer cylinder 41a.

[0044] The overcap 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 is not provided with a discharge port for discharging the contents in the inner bag 4.

[0045] In a state where the overcap 42 closes the discharge port 8d, the inner cylinder 42b is inserted into the nozzle 8c of the cap body 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 cap body 41. From this state, by gripping the outer cylinder 42a and applying an upward force to the overcap 42, the overcap 42 can be separated from the cap body 41 to open the discharge port 8d.

[0046] <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.

[0047] <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 and axial directions, 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, by 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.

[0048] 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, and then, by pulling the mouthpiece mounting member 8, the inner bag 4 can be pulled out of the container body 2.

[0049] 1-2. Manufacturing method of the container 1 The container body 2 can be manufactured by biaxially stretch blow molding the preform 15 shown in FIG. 9. Further, the container 1 can be manufactured by mounting the mouthpiece mounting member 8 on the container body 2.

[0050] <Configuration of the inner preform 14, the outer preform 13, and the preform 15> As shown in FIG. 8, the preform 15 includes an inner preform 14 that becomes the inner bag 4 and an outer preform 13 that becomes the outer shell 3.

[0051] As shown in Fig. 8, the inner preform 14 is 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 is 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.

[0052] As shown in Fig. 9, by covering the inner preform 14 with the outer preform 13, the preform 15 can be formed. 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.

[0053] 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. Regarding the configuration included in the mouth portion 5, the above-described content is applicable to the configuration included in the mouth portion 15a as long as it does not conflict with the gist thereof.

[0054] <Materials and manufacturing methods of the 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).

[0055] The outer preform 13 is preferably formed by injection molding. The inner preform 14 is preferably formed by direct blow molding using a molten cylindrical parison. When the inner preform 14 is formed by direct blow molding, a structure in which a recess 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.

[0056] The inner preform 14 can be molded using a split mold that opens to the left and right with the parting line PL shown in FIG. 10B as the boundary. The inner preform 14 is provided with an engaging convex portion 14c2 that serves as the engaging convex portion 4c2. The inner preform 14 is provided with eight engaging convex portions 14c2 as shown in FIG. 10B. Four engaging convex portions 14c2 (14c21, 14c22, 14c23, 14c24) provided at the positions shown in regions C to F in FIG. 10B have the shapes shown in FIGS. 10C to 10F. The remaining four engaging convex portions 14c2 in FIG. 10B have shapes that are point-symmetrical to the engaging convex portions 14c21, 14c22, 14c23, 14c24. The engaging convex portions 14c21, 14c22, 14c23, 14c24 are each formed in a shape that does not become an undercut when the inner preform 14 is removed from the split mold in the left-right direction. Therefore, when the inner preform 14 is removed from the split mold, the shapes of the engaging convex portions 14c21, 14c22, 14c23, 14c24 are prevented from collapsing.

[0057] 2. Other Embodiments · In the above embodiment, the direction in which each member is relatively rotated may be reversed. In the above embodiment, it is configured such that the inner bag 4 is displaced in the direction of coming out of the container body 2 by rotating in the loosening direction of the right-handed screw, but it may also be configured such that the inner bag 4 is displaced in the direction of coming out of the container body 2 by rotating in the loosening direction of the left-handed screw.

Explanation of Reference Numerals

[0058] 1: Container 2: Container Body 3: Outer Shell 3a: Open End 3a1: Base Surface 3a2: Annular Convex Portion 3a3: Inner Bag Support Surface 3a4: Vertex 3f1: First Flange Portion 3f2: Second Flange Portion 3f3: Lower Surface 3f4: Central Surface 3f5: Upper Surface 3g: Concave Portion 3l: Cam Rail 3m: Concave strip 4: Inner pocket 4a: First cylinder 4b: Second cylinder 4b1: Peripheral wall 4b2: Bottom wall 4b3: Corner 4b4: Bottom surface 4c: Protrusion 4c13: Recess 4c2: Engaging convex part 4c5: Annular convex part 4c8: Tapered surface 4d: Inner pocket body 4e: Inclined part 4f: Sealing cylinder part 4f1: Inner surface 4g: Convex strip 4m3: Bottom surface 4ma: Axial engaging part 4mb: Circumferential engaging part 4o: Diameter-expanded part 5: Mouth part 5c: Open end 6: Barrel part 6b: Shoulder 6c: Barrel body 7: Bottom part 8: Mouth part mounting member 8a: Cap 8b: Engaging part 8b3: Annular convex part 8b4: Tip 8c: Nozzle 8d: Discharge port 13: Outer preform 13a: Mouth part 13b: Barrel part 13c: Bottom part 13d: Open end 13f2: Second flange part 13f3: Bottom surface 13l: Cam rail 14: Inner preform 14a: Mouth part 14b: Barrel part 14c: Bottom part 14c2: Engaging convex part 14c21: Engagement convex part 14c22: Engagement convex part 14c23: Engagement convex part 14c24: Engagement convex part 14g: Rib 15: Preform 15a: Mouth part 15b: Barrel part 15c: Bottom part 15g: Cam mechanism 31: Cam mechanism 41: Cap body 41a: Outer cylinder 41a1: Open end 41b: Inner cylinder 41b1: Outer peripheral surface 41d: Upper wall 41i: Flow-through hole 42: Overcap 42a: Outer cylinder 42b: Inner cylinder 42d: Upper wall 43: Hinge 44: Gap PL: Parting line α: Angle

Claims

1. A container comprising a container body and a mouth-attaching member attached to the mouth of the container body, wherein the mouth-attaching member is configured to be attached to the mouth in a plugging manner, the container body includes an axial engagement portion that engages with the mouth-attaching member in the axial direction and a circumferential engagement portion that engages with the mouth-attaching member in the circumferential direction, the axial direction is the direction in which the central axis of the mouth extends, and the circumferential direction is the rotational direction centered on the central axis, the circumferential engagement portion is disposed at a position farther from the opening end of the mouth than the axial engagement portion, the mouth-attaching member includes an engagement portion, the engagement portion of the mouth-attaching member engages with the axial engagement portion in the axial direction and engages with the circumferential engagement portion in the circumferential direction.

2. The container according to Claim 1, wherein the circumferential engagement portion includes a plurality of engagement protrusions spaced apart along the circumferential direction.

3. The container according to Claim 1, wherein the axial engagement portion includes an annular protrusion.

4. The container according to Claim 1, wherein the container body includes an inner bag and an outer shell disposed so as to cover the inner bag, the inner bag includes a protruding portion protruding from the opening end of the outer shell, the axial engagement portion and the circumferential engagement portion are provided on the protruding portion.

5. The container according to any one of Claims 1 to 4, wherein the mouth-attaching member includes an outer cylinder, the engagement portion is provided on the inner peripheral surface of the outer cylinder.

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