Double container

Abstract

To provide a double container capable of reducing a diameter by twisting an inner bag while increasing the freedom of selecting a mouth fitting member.SOLUTION: This double container comprises: a container body; an engagement member 45; and a mouth fitting member 8. The container body includes an inner bag 4, and an outer shell 3 disposed to cover the inner bag. The inner bag includes a protrusion that protrudes from the opening end of the outer shell. The mouth fitting member is fitted to the protrusion, and the engagement member and the protrusion are engaged at a peripheral engagement part in a peripheral direction.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] Patent document 1 discloses a double container that is configured so that the inner bag can be rotated relative to the outer shell by rotating a mouth attachment member that is circumferentially engaged with the inner bag relative to the outer shell, thereby twisting the inner bag to reduce its diameter, and then the mouth attachment member can be pulled to pull the inner bag out of the container body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2024-018821 Summary of the Invention [Problem to be solved by the invention]

[0004] In the double-walled container of Patent Document 1, the spout attachment member is attached to the inner bag using a stopper-type fastening mechanism, and even when the spout attachment member is rotated relative to the inner bag, it does not come off the inner bag. On the other hand, some commercially available spout attachment members are screw-type. When such spout attachment members are attached to the inner bag, applying torque to the spout attachment member to rotate the inner bag relative to the outer shell may result in relative rotation between the spout attachment member and the inner bag, rather than relative rotation between the inner bag and the outer shell. For this reason, screw-type spout attachment members cannot currently be used. Furthermore, even with a stopper-type spout attachment member, if the spout attachment member and the inner bag are not circumferentially engaged, rotating the spout attachment member relative to the outer shell may prevent the inner bag from rotating relative to the outer shell. These factors limit the freedom of choice when selecting spout attachment members.

[0005] The present invention was made in consideration of these circumstances, and provides a double container that allows the inner bag to be twisted to reduce its diameter while increasing the freedom of selection of the mouth attachment member. [Means for solving the problem]

[0006] According to the present invention, the following inventions are provided. [1] A double container comprising a container body, an engaging member, and a mouth attachment member, wherein the container body comprises an inner bag and an outer shell arranged to cover the inner bag, the inner bag comprises a protrusion protruding from the open end of the outer shell, the mouth attachment member is attached to the protrusion, and the engaging member and the protrusion are engaged circumferentially at a circumferential engagement portion. [2] A double container as described in [1], wherein the container body is configured such that, when viewed from above the double container, when the inner bag is rotated in one direction relative to the outer shell, the inner bag is displaced in a direction that causes it to slip out of the container body. [3] A double container as described in [2], wherein the mouth attachment member and the protrusion are screwed together so that rotation of the mouth attachment member relative to the protrusion in one direction is the direction of loosening the screwing. [4] The double container according to any one of [1] to [3], wherein the engaging member and the protruding portion are engaged with each other in a concave-convex manner in the circumferential direction at the circumferential engaging portion. [5] A double container according to any one of [1] to [4], wherein the protrusion is provided with a male thread portion, the inner bag is provided with a flange, the lower surface of the flange abuts against the outer shell, and the circumferential engagement portion is positioned between the male thread portion and the flange. [6] The double container according to any one of [1] to [5], wherein the protrusion is disposed within an opening provided in the engaging member. [7] [6] A double container as described above, wherein the engaging member comprises a cylindrical portion and a top surface portion provided on the top surface of the cylindrical portion, the opening is provided on the top surface portion, and the peripheral surface of the opening and the outer peripheral surface of the protrusion are engaged in the circumferential direction. [8] [7] A double container as described in [7], wherein the protrusion is provided with a male thread portion, the inner bag is provided with a flange, the lower surface of the flange abuts against the outer shell, the circumferential engaging portion is arranged between the male thread portion and the flange, the upper surface of the flange abuts against the top surface portion, and the tubular portion of the engaging member is arranged to surround the outer shell. [Effects of the Invention]

[0007] In the double container of the present invention, the engaging member is circumferentially engaged with the protruding portion of the inner bag, so that by grasping the engaging member and rotating it relative to the outer shell, the inner bag is rotated relative to the outer shell, thereby twisting the inner bag to reduce its diameter. Therefore, in the double container of the present invention, there is no need to apply torque to the spout attachment member when twisting the inner bag, so there is no need for the spout attachment member and the inner bag to be circumferentially engaged, increasing the freedom of selection of the spout attachment member. [Brief explanation of the drawings]

[0008] [Figure 1] This is a perspective view of a double container 1 according to one embodiment of the present invention. The dashed-dotted line in the figure indicates the boundary line where the curvature of the faces that make up the surface shape changes. This is also true for the other figures. [Figure 2] FIG. 2 is an exploded perspective view of the double container 1 of FIG. [Figure 3] 3 is an exploded perspective view of the vicinity of the mouth 5 of the container body 2 in FIG. 2. FIG. [Figure 4] 2 is a cross-sectional view of the double container 1 of Fig. 1. However, only a part of the pump 9 is shown in cross section, and the rest is shown in front view. [Figure 5] 5 is an exploded view of the cross-sectional view of FIG. 4, except that only a portion of the pump 9 is shown. [Figure 6] Fig. 6A is a perspective view of the engaging member 45 as seen obliquely from below. Fig. 6B is a bottom view of the engaging member 45. Fig. 6C is an end view taken along line CC in Fig. 4. [Figure 7] 2 is an enlarged view of the vicinity of the mouth 5 in a state where the pump 9 has been removed from the double container 1 in FIG. 1 and the top surface 45e of the engaging member 45 has been removed. [Figure 8] FIG. 2 is a perspective view showing a state in which the inner preform 14 and the outer preform 13 are separated. [Figure 9] FIG. 1 is a perspective view of a preform 15 formed by covering an outer preform 13 on an inner preform 14. DETAILED DESCRIPTION OF THE INVENTION

[0009] The following describes embodiments of the present invention. The various features shown in the following embodiments can be combined with each other. Each feature can be an invention independently. In the following embodiments, elements not specified in the claims are optional and can be omitted. Any number of "0"s (for example, one or two) may be added to the end of numerical values ​​disclosed in the following description. For example, one or two "0"s may be added after "1.4" to make it "1.40" or "1.400."

[0010] 1. Configuration of double container 1 A double-layered container 1 according to one embodiment of the present invention will be described with reference to Figures 1 to 7. In the following description, terms relating to directions such as "upper" and "lower" refer to directions when the bottom 7 is in contact with the ground. In addition, in the following description, the "axial direction" refers to the direction in which the central axis C (shown in Figure 2) of the mouth 5 extends, in other words, the direction in which the inner bag 4 is pulled out from the container body 2. The "circumferential direction" refers to the direction in which the mouth 5 rotates around the central axis C, in other words, the direction in which the inner bag 4 is rotated at the mouth 5 relative to the outer shell 3.

[0011] <Overall structure> As shown in FIGS. 1 and 2, the double container 1 of this embodiment includes a container body 2, a spout attachment member 8 (a pump 9 in this embodiment), an engaging member 45, and a sealing member 46. The container body 2 is configured so that, when viewed from above the double container 1, rotating the inner bag 4 in one direction relative to the outer shell 3 causes the inner bag 4 to displace in a direction that allows it to slip out of the container body 2. The spout attachment member 8 and the protrusion 4c are configured to be screwable together such that rotation of the spout attachment member 8 in one direction relative to the protrusion 4c is the direction in which the screwing is loosened. In this embodiment, the one direction is a counterclockwise direction as viewed from above the double container 1. Hereinafter, "clockwise" and "counterclockwise" refer to directions as viewed from above the double container 1, unless otherwise specified. Each component will be described in detail below.

[0012] <Basic configuration of container body 2> As shown in FIG. 2, the container body 2 has a mouth 5, a body 6, and a bottom 7. The mouth 5 is a tubular (preferably cylindrical) portion having an open end 5c. The open end 5c is the open end of the container body 2 and also the open end of the inner bag 4. The mouth 5 is provided with a flange 5b. The flange 5b can be used to support the mouth 5 when a mouth attachment member 8 is attached to the mouth 5.

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

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

[0015] The double container 1 of this embodiment may be configured so that the inner bag 4 contracts as the contents are dispensed. In this case, the mouth attachment member 8 is provided with a check valve that allows the contents to be dispensed and prevents outside air from entering the inner bag 4. In this case, the container body 2 is also provided with an outside air inlet for introducing outside air into the space between the outer shell 3 and the inner bag 4.

[0016] <Detailed configuration of outer shell 3 and inner bag 4> As shown in FIG. 3, the inner bag 4 has a protruding portion 4c that protrudes from the open end 3a of the outer shell 3. The protruding portion 4c is provided with a protruding tube 4c1, a male thread portion 4c8, and an uneven portion 4i. The uneven portion 4i is located farther from the open end 5c than the male thread portion 4c8. The uneven portion 4i is configured by recessed portions 4i1 and protruding portions 4i2 that are arranged alternately in the circumferential direction. In this embodiment, 12 recessed portions 4i1 and 12 protruding portions 4i2 are arranged alternately in the circumferential direction.

[0017] A flange 4c10 is provided on the inner bag 4. The flange 4c10 is provided so as to protrude in the radial direction. The flange 4c10 is preferably provided around the entire circumference. An uneven portion 4i is provided between the flange 4c10 and the male thread portion 4c8. The flange 4c10 is provided adjacent to the uneven portion 4i.

[0018] As shown in FIGS. 4 and 5 , the lower surface 4c11 of the flange 4c10 abuts against the outer shell 3. The lower surface 4c11 abuts against the inner bag support surface 3a3 provided on the outer shell 3. The lower surface 4c11 of the flange 4c10 is supported by the inner bag support surface 3a3, thereby preventing the inner bag 4 from falling into the outer shell 3. The inner bag support surface 3a3 may be flush with the base surface 3a1 of the open end 3a, or may be provided at a higher or lower position than the base surface 3a1. In this embodiment, the inner bag support surface 3a3 is provided at a lower position than the base surface 3a1. Therefore, a portion of the flange 4c10 is disposed inside the outer shell 3, and the remainder is disposed outside the outer shell 3. The flange 4c10 may be entirely disposed inside or outside the outer shell 3. When inner bag 4 is made by direct blow molding, flange 4c10 tends to have low strength and is easily damaged when dropped. However, by arranging at least a portion of flange 4c10 inside outer shell 3, damage to flange 4c10 is suppressed.

[0019] 3, a ridge 4g is provided on the outer peripheral surface of the inner bag 4 (more specifically, the inner bag main body 4d). The lower surface of the ridge 4g is inclined counterclockwise when viewed from the opening end 5c of the mouth portion 5 so as to approach the opening end 5c.

[0020] A cam rail 3l is provided on the inner peripheral surface of the outer shell 3. A recess 3m that can engage with the protrusion 4g is provided in a portion of the cam rail 3l. The recess 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 open end 3a as it progresses in the counterclockwise direction. The protrusion 4g and the recess 3m are configured to be engageable with each other by rotating the inner bag 4 clockwise relative to the outer shell 3, and to be disengageable by rotating the inner bag 4 counterclockwise relative to the outer shell 3.

[0021] Before the inner bag 4 is pulled out of the container body 2, the lower surface of the ridge 4g abuts against the upper surface of the cam rail 3l. The ridge 4g and the cam rail 3l form a cam mechanism 31. When the inner bag 4 is rotated counterclockwise relative to the outer shell 3, the cam mechanism 31 causes the inner bag 4 to displace in a direction that allows it to come out of the container body 2. At this time, the inner bag 4 is twisted and its diameter is reduced. The cam mechanism 31 has an inclined structure that is inclined in the same direction as a right-handed screw.

[0022] <Detailed configuration of the engagement member 45> As shown in FIGS. 2 to 7, the engaging member 45 is a member that engages with the protruding portion 4c in the circumferential direction. The engaging member 45 may be annular or non-annular. If the engaging member 45 is annular, the engaging member 45 may be circular or non-circular in plan view (that is, when viewed axially from above the double container 1). Furthermore, it is sufficient for the engaging member 45 to be circumferentially engaged with the protruding portion 4c to an extent that it can rotate integrally with the protruding portion 4c, and it is not necessary for the engaging member 45 to cover the entire circumference of the protruding portion 4c; it is sufficient for the engaging member 45 to cover at least a portion of the circumferential direction of the protruding portion 4c. The angle at which the engaging member 45 covers the protrusion 4c is, for example, 180 to 360 degrees, and more specifically, for example, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350, or 360 degrees, or may be in a range between any two of the numerical values ​​exemplified here.

[0023] In this embodiment, the engaging member 45 is an annular member having an opening 45a. The protruding portion 4c is disposed within the opening 45a. That is, the engaging member 45 is disposed so as to surround the protruding portion 4c. As shown in FIGS. 6 and 7, a concave-convex portion 45c is provided on a peripheral surface 45b of the opening 45a. The concave-convex portion 45c is configured by alternately providing concave portions 45c1 and convex portions 45c2 in the circumferential direction. In this embodiment, 12 concave portions 45c1 and 12 convex portions 45c2 are alternately provided in the circumferential direction.

[0024] As shown in FIGS. 4, 6C, and 7, when the engaging member 45 is attached to the protruding portion 4c, the convex portions 45c2 on the engaging member 45 are disposed between the adjacent convex portions 4i2 on the protruding portion 4c. Therefore, the concave-convex portions 4i and 45c form a circumferential engaging portion 47, through which the engaging member 45 and the protruding portion 4c are engaged in the circumferential direction. In the circumferential engaging portion 47, the peripheral surface 45b of the opening 45a and the outer peripheral surface 4c12 of the protruding portion 4c are engaged in the circumferential direction. In this embodiment, the engaging member 45 and the protruding portion 4c are engaged in the circumferential direction. The circumferential engaging portion 47 is disposed at a position farther from the open end 5c than the male thread portion 4c8. The circumferential engaging portion 47 is disposed between the male thread portion 4c8 and the flange 4c10.

[0025] At the circumferential engagement portion 47, the engagement member 45 and the protrusion 4c are circumferentially engaged with each other so that when the engagement member 45 is rotated counterclockwise relative to the outer shell 3, the inner bag 4 rotates relative to the outer shell 3 before the engagement member 45 rotates relative to the protrusion 4c. The engagement at the circumferential engagement portion 47 may be a convex-concave engagement or a frictional engagement. If the torque required to rotate the inner bag 4 counterclockwise relative to the outer shell 3 is T1 and the torque required to rotate the engagement member 45 counterclockwise relative to the protrusion 4c is T2, T2 / T1 is greater than 1, preferably 1.2 or greater, and more preferably 2 or greater. This value may be, for example, 1.2, 1.5, 2, 5, 10, or 100, and may be a value between or greater than any two of the values ​​exemplified herein.

[0026] As shown in FIGS. 2 and 5, the engaging member 45 includes a cylindrical portion 45d and a top surface portion 45e provided on the top surface of the cylindrical portion 45d. The opening 45a is provided in the top surface portion 45e. As shown in FIGS. 4 and 5, the upper surface 4c13 of the flange 4c10 abuts against the top surface portion 45e. The cylindrical portion 45d is disposed so as to surround the outer shell 3. This configuration facilitates stable rotation of the engaging member 45. An open end 45h of the cylindrical portion 45d faces the flange 5b. An outer peripheral surface 45d1 of the cylindrical portion 45d and an outer peripheral surface 5b1 of the flange 5b are flush with each other.

[0027] <Mouth-mounted member 8 and seal member 46> As shown in FIG. 2, the mouth attachment member 8 is a member attached to the mouth 5 of the container body 2. As shown in FIGS. 4 and 5, the mouth attachment member 8 has a female threaded portion 8b that can be threadedly engaged with the male threaded portion 4c8. By threading the male threaded portion 4c8 and the female threaded portion 8b, the mouth attachment member 8 is attached to the protrusion 4c provided on the mouth 5 of the inner bag 4. The sealing member 46 is a member that improves adhesion between the container body 2 and the mouth attachment member 8 to prevent leakage of the contents of the container body 2. The sealing member 46 is preferably made of an elastic member such as rubber. The sealing member 46 has an opening 46a for allowing the contents to flow through. The sealing member 46 is disposed on the open end 5c. In this embodiment, the mouth attachment member 8 is a pump 9, but it may also be another member such as a cap. The sealing member 46 can be omitted if unnecessary.

[0028] When the mouth attachment member 8 is rotated counterclockwise relative to the outer shell 3, it is preferable that the mouth attachment member 8 and the protruding portion 4c rotate relative to each other in the circumferential direction before the inner bag 4 rotates relative to the outer shell 3. In this case, there is a risk that the mouth attachment member 8 will rotate relative to the protruding portion 4c before the inner bag 4 rotates relative to the outer shell 3, making the application of the present invention particularly significant. If the torque required to rotate the inner bag 4 counterclockwise relative to the outer shell 3 is T1 and the torque required to rotate the mouth attachment member 8 counterclockwise relative to the protruding portion 4c is T3, then T3 / T1 is less than 1, preferably 0.9 or less, and more preferably 0.8 or less. This value is, for example, 0.1 to 0.99, and specifically, for example, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, or 0.99, and may be within a range between any two of the values ​​exemplified herein.

[0029] The pump 9 is configured to be able to suck and discharge the contents within the container body 2. As shown in FIGS. 2 and 4-5, the pump 9, in one example, includes a cylindrical portion 9a, a nozzle 9b, a piston portion 9c, a pump mechanism portion 9d, and a tube 9e. The pump 9 is able to discharge the contents sucked up through the tube 9e from the nozzle 9b communicating with the piston portion 9c by sliding the piston portion 9c to operate the pump mechanism within the pump mechanism portion 9d. The tube 9e can be omitted if not required. The nozzle 9b is provided on a head 9f, and the piston portion 9c can be slid as the head 9f is pressed down and released.

[0030] As shown in FIG. 4, the cylindrical portion 9a includes a threaded cylindrical portion 9a1, a top surface portion 9a2, and a sliding cylindrical portion 9a3. The top surface portion 9a2 is provided on the top surface of the threaded cylindrical portion 9a1. The sliding cylindrical portion 9a3 is provided on the top surface portion 9a2. The threaded cylindrical portion 9a1 and the sliding cylindrical portion 9a3 are connected to each other and are preferably arranged concentrically. A female thread portion 8b is provided on the inner peripheral surface of the threaded cylindrical portion 9a1. A lower end 9a4 of the cylindrical portion 9a faces the top surface portion 45e. In other words, the top surface portion 45e is arranged between the flange 4c10 and the cylindrical portion 9a. In this embodiment, a gap is provided between the upper surface 45g of the top surface portion 45e and the lower end 9a4. However, this gap may be eliminated, or the top surface portion 45e may be sandwiched and fixed between the flange 4c10 and the cylindrical portion 9a. Furthermore, a protrusion that can come into contact with upper surface 45g of top surface 45e may be provided on inner bag 4, and top surface 45e may be positioned between flange 4c10 and the protrusion to fix top surface 45e. In this case, engaging member 45 can be attached so as to climb over the protrusion of inner bag 4.

[0031] A flange 9g is provided on the outer peripheral surface of the pump mechanism 9d. The flange 9g is disposed between the top surface 9a2 and the open end 5c. It is also preferable to dispose a seal member 46 between the flange 9g and the open end 5c. With this configuration, by rotating the tubular portion 9a clockwise relative to the protruding portion 4c and tightening it, the flange 9g (and the seal member 46) are clamped between the top surface 9a2 and the open end 5c, forming a seal structure that prevents leakage of the contents.

[0032] The head 9f includes a cylindrical portion 9f1. When a downward force is applied to the head 9f, the sliding cylindrical portion 9a3 enters the cylindrical portion 9f1 and the head 9f moves downward, at which time the head 9f presses down the piston portion 9c, activating the pump mechanism in the pump mechanism portion 9d.

[0033] 2. Manufacturing the double container 1 and removing the inner bag 4 The double container 1 of this embodiment can be manufactured by filling the container body 2 with the contents and then attaching the engaging member 45 and the opening attachment member 8.

[0034] The engaging member 45 is circumferentially engaged with the protruding portion 4c of the inner bag 4, and is configured so that the inner bag 4 rotates relative to the outer shell 3 as the engaging member 45 rotates. By rotating the inner bag 4 relative to the outer shell 3, the inner bag 4 can be twisted and reduced in diameter. Also, due to the action of a 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 that allows it to be removed from the container body 2 as the inner bag 4 rotates. Therefore, by rotating the engaging member 45, the inner bag 4 can be moved in a direction that allows it to be removed from the container body 2 while being twisted and reduced in diameter.

[0035] Furthermore, the spout attachment member 8 is axially engaged with the protruding portion 4c by screwing. Furthermore, if the circumferential engagement portion 47 is positioned farther from the open end 5c than the male thread portion 4c8, when an attempt is made to pull the engagement member 45 in the axial direction to remove the inner bag 4, the engagement member 45 will come into contact with the spout attachment member 8. Therefore, the engagement member 45 is axially engaged with the protruding portion 4c via the spout attachment member 8. With this configuration, the inner bag 4 can be removed from the container body 2 by grasping the spout attachment member 8 and / or the engagement member 45 and pulling them in the axial direction.

[0036] In this way, in the double container 1 of this embodiment, there is no need to apply torque to the opening attachment member 8 when pulling out the inner bag 4, so a screw-type opening attachment member 8 can be used.

[0037] After the inner bag 4 is removed, the spout attachment member 8 can be rotated relative to the inner bag 4 in a direction that loosens the screw connection, thereby separating the spout attachment member 8 and the inner bag 4. Furthermore, after the spout attachment member 8 is separated, the engaging member 45 can be separated from the inner bag 4 by moving the engaging member 45 axially relative to the inner bag 4. The double-walled container 1 of this embodiment is highly recyclable because the multiple components constituting the double-walled container 1 are configured to be easily separable. After separation, the inner bag 4 and the outer shell 3 can be recycled separately. The other components may be recycled or reused. For example, a container body 2 filled with contents can be purchased, and the engaging member 45, sealing member 46, and spout attachment member 8 can be attached to it to regenerate the double-walled container 1 filled with contents. By distributing the container body 2 filled with contents without the engaging member 45 attached, it is possible to prevent the engaging member 45 from being rotated by tampering or other means during distribution.

[0038] 3. Manufacturing method of the container body 2 of the double container 1 The container body 2 can be manufactured by biaxially stretching and blow molding a preform 15 shown in FIG.

[0039] <Configuration of inner preform 14, outer preform 13, and preform 15> As shown in FIG. 8, the preform 15 includes an inner preform 14 that will become the inner bag 4 and an outer preform 13 that will become the outer shell 3.

[0040] As shown in Fig. 8, the inner preform 14 is cylindrical with a bottom and includes a mouth portion 14a, a body portion 14b, and a bottom portion 14c. The bottom portion 14c is provided so as to close the lower end of the body portion 14b. The outer preform 13 is cylindrical with a bottom and includes a mouth portion 13a, a body portion 13b, and a bottom portion 13c. The bottom portion 13c is provided so as to close the lower end of the body portion 13b.

[0041] 9, a preform 15 can be formed by covering an inner preform 14 with an outer preform 13. In the preform 15, the mouth portion 14a faces the mouth portion 13a, and the body portion 14b faces the body portion 13b.

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

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

[0044] The outer preform 13 is preferably formed by injection molding, and the inner preform 14 is preferably formed by direct blow molding using a molten cylindrical parison.

[0045] 4. Other embodiments The direction in which each component is rotated relative to the above embodiment may be reversed. In the above embodiment, the inner bag 4 is configured to be displaced in a direction that removes it from the container body 2 when the clockwise thread is rotated in the loosening direction, and the engagement between the spout attachment member 8 and the protrusion 4c is released. However, the inner bag 4 may be configured to be displaced in a direction that removes it from the container body 2 when the counterclockwise thread is rotated in the loosening direction, and the engagement between the spout attachment member 8 and the protrusion 4c is released. In this case, the "one direction" referred to in the above embodiment refers to the clockwise direction, and "counterclockwise" in the description of the above embodiment is replaced with "clockwise" and "clockwise" is replaced with "counterclockwise".

[0046] The cam mechanism 31 can be omitted. If the cam mechanism 31 is omitted, the inner bag 4 will not be displaced in a direction that causes it to come out of the container body 2 even when it is rotated relative to the outer shell 3. However, by rotating the inner bag 4 relative to the outer shell 3, the inner bag 4 can be twisted and reduced in diameter, which makes it easier to pull the inner bag 4 out of the container body 2.

[0047] The mouth attachment member 8 may be attached to the protruding portion 4c in a manner different from that of the above embodiment, for example, it may be attached to the protruding portion 4c in a stoppered manner. The mouth attachment member 8 may or may not be circumferentially engaged with the protruding portion 4c. However, as with the above embodiment, the significance of applying the present invention becomes apparent when, when the mouth attachment member 8 is rotated counterclockwise relative to the outer shell 3, the mouth attachment member 8 and the protruding portion 4c rotate relative to each other in the circumferential direction before the inner bag 4 rotates relative to the outer shell 3. The preferred range of T3 / T1 is also the same as with the above embodiment. [Explanation of symbols]

[0048] 1:Double container 2: Container body 3: Outer shell 3a: Open end 3a1: Base surface 3a3: inner bag support surface 3l: Cam rail 3m: Concave 4: Inner bag 4c:Protrusion 4c1:Protruding tube 4c10: Flange 4c11: Bottom surface 4c12: Outer surface 4c13:Top surface 4c8: Male thread 4d: Inner bag body 4g: Convex strip 4i: Uneven part 4i1: Recess 4i2: Convex part 5: Mouth 5b: Flange 5b1: Outer surface 5c: Open end 6: Body 6b:Shoulder 6c: Body 7: Bottom 8: Mouth attachment member 8b: Female thread 9: Pump 9a:Cylinder part 9a1: Threaded tube part 9a2:Top part 9a3: Sliding tube part 9a4: Bottom edge 9b: Nozzle 9c: Piston section 9d: Pump mechanism 9e: Tube 9f: Head 9f1:Cylinder part 9g: flange 13: Outer preform 13a: Mouth 13b: Torso 13c: Bottom 13d: Flange 14: Inner preform 14a: Mouth 14b: Torso 14c: Bottom 15: Preform 15a: Mouth 15b: Body 15c: bottom 31: Cam mechanism 45: Engagement member 45a: Opening 45b: Peripheral surface 45c: Uneven part 45c1: Recess 45c2: Convex part 45d: Cylinder part 45d1: Outer surface 45e:Top section 45g:Top surface 45h: Open end 46: Sealing material 46a: Opening 47: Circumferential engagement portion C: Central axis

Claims

1. A double container comprising a container body, an engaging member, and a mouth attachment member, The container body includes an inner bag and an outer shell disposed to cover the inner bag, the inner bag has a protrusion protruding from the open end of the outer shell, The mouth attachment member is attached to the protrusion, The double container, wherein the engaging member and the protrusion are engaged in a circumferential direction at a circumferential engaging portion.

2. The double container according to claim 1, The container body is configured such that, when viewed from above the double container, the inner bag is displaced in a direction that allows it to slip out of the container body when the inner bag is rotated in one direction relative to the outer shell.

3. The double container according to claim 2, The mouth attachment member and the protrusion are screwed together such that rotation of the mouth attachment member relative to the protrusion in the one direction is a direction for loosening the screwing.

4. The double container according to any one of claims 1 to 3, The double container, wherein the engaging member and the protrusion are engaged with each other in a concave-convex manner in the circumferential direction at the circumferential engaging portion.

5. The double container according to any one of claims 1 to 3, The protrusion is provided with a male screw portion, The inner bag is provided with a flange, The lower surface of the flange abuts against the outer shell, The double container, wherein the circumferential engagement portion is disposed between the male thread portion and the flange.

6. The double container according to any one of claims 1 to 3, The protrusion is disposed within an opening provided in the engagement member.

7. The double container according to claim 6, The engaging member includes a cylindrical portion and a top surface portion provided on a top surface of the cylindrical portion, the opening is provided in the top surface portion, A double container, wherein the peripheral surface of the opening and the outer peripheral surface of the protrusion are engaged in the circumferential direction.

8. The double container according to claim 7, The protrusion is provided with a male screw portion, The inner bag is provided with a flange, The lower surface of the flange abuts against the outer shell, The circumferential engagement portion is disposed between the male thread portion and the flange. The upper surface of the flange abuts against the top surface portion, The cylindrical portion of the engaging member is disposed so as to surround the outer shell.

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