JP2024041617A - Double container and method for extracting inner bag of double container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double container which enables easy extraction of an inner bag from a container body.

SOLUTION: According to the present invention, a double container is provided that comprises a container body and a mouth portion attachment member. The mouth portion attachment member is attached to a mouth portion of the container body. The container body has: an inner bag; and an outer shell disposed so as to cover the inner bag. The inner bag includes a protruding part protruding from an open end of the outer shell. The protruding part is provided with a holding part having an antislip shape.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a double container and a method for pulling out the inner bag of the double container.

2. Description of the Related Art Conventionally, double containers are known that include a container body having an outer shell and an inner bag. For example, Patent Document 1 discloses a double container formed by performing biaxial stretch blow molding on an outer shell preform and an inner bag preform in a stacked state.

JP 2019-10741 Publication

By the way, if the outer shell and inner bag of such a double-sided container are made of different materials, or if the contents are stuck to the inner bag after use, it is not possible to recycle the double-sided container. When doing so, it is desirable to separate the outer shell and inner bag.

It is assumed that the outer shell and the inner bag can be separated by pulling the inner bag out of the container body, and it is desired to make it easier to pull out the inner bag from the container body.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a double-layered container in which the inner bag can be easily pulled out from the container body.

According to the present invention, the following inventions are provided.
[1] (First aspect) A double container comprising a container body and a mouth attachment member, the mouth attachment member being attached to the mouth of the container body, and the container body comprising: The inner bag includes an inner bag and an outer shell disposed to cover the inner bag, the inner bag includes a protrusion protruding from an open end of the outer shell, and the protrusion includes a grip having a non-slip shape. A double container with a section.

In the double container of the present invention, the protruding portion of the inner bag is provided with a non-slip shape on the circumferential surface, so that it is easy to grasp the inner bag and pull out the inner bag.

[2] In the double container according to [1], when the mouth attachment member is attached to the mouth, the anti-slip shape is engaged with the mouth attachment member in a circumferential direction. and the grip part is not covered by the mouth attachment member.
[3] The double container according to [1] or [2], wherein the anti-slip shape is an uneven shape.
[4] The double-layered container according to [1] or [2], wherein the anti-slip shape is radially further away from the outer edge of the attachment portion of the mouth attachment member that is attached to the mouth. Double container with a projecting projection.
[5] (Second Aspect) A double container comprising a container body and a mouth attachment member, wherein the mouth attachment member includes an inner stopper that is attached to the mouth of the container body, and an inner stopper that is attached to the mouth of the container body. The container body includes an inner bag and an outer shell disposed to cover the inner bag, and the mouth attachment member is configured to be removable from the mouth. A double container, wherein the opening of the inner bag and the overcap are each provided with an engaging convex portion that allows the opening of the inner bag and the overcap to engage in the circumferential direction.
[6] The double container according to [5], wherein the inner stopper is attached to the mouth of the inner bag.
[7] (Third Aspect) A method for pulling out the inner bag of a double container, wherein the double container includes a container body and a mouth attachment member, and the mouth attachment member is attached to the mouth of the container body. the container body includes an inner bag and an outer shell disposed to cover the inner bag, and the method includes a step of removing the mouth attachment member and a step of pulling out the inner bag, In the mouth part attachment member removal step, the mouth part attachment member is removed from the mouth part, and in the inner bag withdrawal step, the mouth part of the inner bag and the twisting jig are engaged in the circumferential direction. A method of pulling out the inner bag while or after twisting the inner bag by rotating a twisting jig.
[8] The method according to [7], wherein the mouth attachment member includes an inner stopper that is attached to the mouth of the container body, and an overcap that is attached to the inner stopper; The method, wherein the ingredient is the overcap.
[9] The method according to [8], wherein the inner plug is attached to the mouth of the inner bag.

FIG. 1 is a perspective view of a double container 1 according to a first embodiment of the present invention. The dashed-dotted line in the figure represents the boundary line where the curvature of the surface forming the surface shape changes. The same applies to other figures. FIG. 2 is an exploded perspective view of FIG. 1; 3 is an enlarged view of area A in FIG. 2. FIG. FIG. 4 is an exploded perspective view of FIG. 3; FIG. 3 is a perspective view of the vicinity of the open end of the outer shell 3. FIG. It is a perspective view of the overcap 27 and the inner stopper 26 viewed diagonally from below. FIG. 7A shows a state in which the inner plug 26 is attached to the inner bag 4. The inner bag 4 is a perspective view showing the vicinity of the opening 5, and the inner plug 26 is a vertical cross-sectional perspective view. FIG. 7B is a vertical cross-sectional perspective view of the inner stopper 26. FIG. 2 is a longitudinal cross-sectional view of the double container 1 shown in FIG. 1 taken through the center of the spout 5 before the spout attachment member 8 is opened. FIG. 3 is a perspective view showing a state in which the inner preform 14 and the outer preform 13 are separated. FIG. 2 is a perspective view showing a preform 15 configured by covering an inner preform 14 with an outer preform 13. It is a perspective view of the double container 1 of 2nd Embodiment of this invention. 12 is a plan view of the double container 1 of FIG. 11. FIG. 12 shows a state in which the mouth attachment member 8 is removed from the double container 1 of FIG. 11. 14 is an exploded perspective view of region A in FIG. 13. FIG. It is a perspective view of the double container 1 of 3rd Embodiment of this invention. FIG. 16 is an exploded perspective view of FIG. 15; 17 is an exploded perspective view of region A in FIG. 16. FIG. FIG. 7 is a perspective view of an overcap 27 and an inner stopper 26 according to a third embodiment, viewed diagonally from below. 19 is a longitudinal cross-sectional view of the inner stopper 26 of FIG. 18 passing through the center of the mouth portion 5. FIG. FIG. 2 is a longitudinal cross-sectional view of the double container 1 shown in FIG. 1 taken through the center of the spout 5 before the spout attachment member 8 is opened. 21 is a sectional view corresponding to FIG. 20, showing a state after the overcap 27 is engaged with the mouth 5 of the inner bag 4 after the mouth attachment member 8 is removed. FIG.

Embodiments of the present invention will be described below. Various features shown in the embodiments described below can be combined with each other. Further, the invention can be realized independently for each feature.

In the embodiments shown below, inventions of first to third aspects are disclosed. The first and second embodiments relate to the first aspect. The third embodiment relates to the second and third aspects. The matters described in the first to third embodiments are mutually applicable unless it contradicts the spirit thereof. Therefore, for example, the structure described in the first embodiment and the structure described in the third embodiment may be combined.

1. First embodiment 1-1. Configuration of double container 1 <Basic configuration>
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 mouth attachment member 8.

As shown in FIGS. 2 and 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 cylindrical) portion having an open end 5c. The mouth part 5 includes an engaging part 4m to which a mouth part attachment member 8 such as a cap or a pump can be attached. Details of the engaging portion 4m will be described later. The mouth portion 5 is provided with a flange 5b. The flange 5b can be used to support the mouth part 5 when the mouth part mounting member 8 is attached to the mouth part 5.

The body portion 6 is disposed adjacent to the mouth portion 5 on a side further away from the opening end 5c than the mouth portion 5. The body portion 6 has a larger outer diameter (in this specification, “outer diameter” means an equivalent circle diameter when the cross section is not circular) than the mouth portion 5. The body part 6 is cylindrical, and the bottom part 7 is provided at the lower end of the body part 6 and closes the lower end of the body part 6. The body portion 6 includes a shoulder portion 6b whose outer diameter increases as the distance from the mouth portion 5 increases. Further, the trunk 6 includes a trunk main body 6c closer to the bottom 7 than the shoulder 6b. The trunk main body 6c has, for example, a shape in which the outer diameter is substantially constant toward the bottom 7, or a shape in which the outer diameter decreases toward the bottom 7.

As shown in FIG. 4, the container body 2 includes an inner bag 4 and an outer shell 3 disposed to cover the inner bag 4. In the inner bag 4, the inner bag main body 4d other than the protrusion 4c is housed in the outer shell 3. In the following description, parts 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. It is called. The same applies to the outer shell 3.

The average wall thickness of the outer shell 3 at the center of the body 6 in the height direction is, for example, 200 to 800 μm, and preferably 250 to 500 μm. 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800 μm, and may be within a range between any two of the numerical values exemplified here.

The average wall thickness of the inner bag 4 at the center of the body 6 in the height direction is, for example, 50 to 250 μm, preferably 50 to 100 μm. Specifically, this wall thickness is, for example, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240. , 250 μm, and may be within a range between any two of the numerical values exemplified here or below any one thereof. In this specification, the average wall thickness at a predetermined height position means the average value of the measured values at eight measurement points set at equal intervals in the circumferential direction at that height position.

If the mouth attachment member 8 is not provided with a check valve, the inner bag 4 will not contract even after the contents of the inner bag 4 are discharged, so the inner bag 4 can be pulled out through the mouth 5 of the outer shell 3. It's not easy. Since the present invention makes it easy to pull out the inner bag 4 through the mouth 5 of the outer shell 3, it is significant to apply the present invention when the mouth attachment member 8 is not provided with a check valve. is particularly noticeable. On the other hand, if the mouth attachment member 8 is provided with a check valve and an outside air introduction part is provided between the outer shell 3 and the inner bag 4 to introduce outside air, the internal air will be removed as the contents are discharged into the inner bag 4. Bag 4 contracts. The present invention is also applicable to such a form.

The inner diameter of the mouth portion 5 of the outer shell 3 is, for example, 20 to 50 mm, preferably 25 to 40 mm. Specifically, the inner diameter of the mouth portion 5 of the outer shell 3 is, for example, 20, 25, 30, 35, 40, 45, 50 mm, and is within the range between any two of the numerical values exemplified here. Good too.

<Detailed structure of outer shell 3 and inner bag 4>
As shown in FIGS. 3 and 4, the inner bag 4 includes a protrusion 4c that protrudes from the open end 3a of the outer shell 3. As shown in FIGS. The protruding portion 4c includes an engaging convex portion 4c2, an annular convex portion 4c5, an abutment flange 4c4, a tip tube portion 4c9, and a gripping portion 4c10. The annular convex portion 4c5 and the engaging convex portion 4c2 constitute an engaging portion 4m for engaging with the mouth attachment member 8. The tip tube portion 4c9 is arranged closer to the open end 4l than the engaging portion 4m. The gripping portion 4c10 is disposed on a side farther from the opening end 4l than the engaging portion 4m (more specifically, between the engaging portion 4m and the abutment flange 4c4).

The annular convex portion 4c5 engages with the mouth mounting member 8 in the axial direction. The engagement convex portion 4c2 engages with the mouth mounting member 8 in the circumferential direction. In this specification, the "axial direction" is the direction in which the central axis C of the mouth portion 5 extends, or in other words, the direction in which the inner bag 4 is pulled out from the container body 2. The “circumferential direction” is a direction in which the mouth portion 5 is rotated about the central axis C, or in other words, a direction in which the inner bag 4 is rotated in the mouth portion 5 with respect to the outer shell 3. Moreover, "upward direction" means upward in the axial direction, and "downward direction" means downward in the axial direction.

It is preferable that the engagement convex portions 4c2 are provided at a plurality of locations (eight locations in this embodiment) spaced apart in the circumferential direction. The engagement convex portion 4c2 is arranged on the annular convex portion 4c5, and is provided so as to protrude radially outward from the annular convex portion 4c5. The annular convex portion 4c5 and the engagement convex portion 4c2 are provided with tapered surfaces 4c8 and 4c3 on their upper surfaces. This allows the annular protrusion 28c (shown in FIG. 7A) of the mouth attachment member 8 to easily climb over the annular protrusion 4c5 and the engagement protrusion 4c2, as will be described later.

Further, as shown in FIG. 7A, the lower surface 4c6 of the engagement projection 4c2 is flush with the lower surface 4c7 of the annular projection 4c5, or is closer to the opening end of the inner bag 4 than the lower surface 4c7 of the annular projection 4c5. located at the location. According to such a configuration, the engagement between the annular protrusion 4c5 and the mouth attachment member 8 in the axial direction is reinforced by the engagement protrusion 4c2, so that the engagement between the mouth attachment member 8 and the inner bag 4 is strengthened. becomes strong.

The contact flange 4c4 is arranged at a position where it contacts the open end 3a. The contact flange 4c4 is an annular portion whose diameter is larger than that of the grip portion 4c10. By abutting the abutting flange 4c4 against the open end 3a, the inner bag 4 is prevented from falling into the outer shell 3.

The grip portion 4c10 is formed with an uneven shape 4c12 as a non-slip shape 4c11. This makes it easier to rotate or pull the inner bag 4 by gripping the grip portion 4c10. In addition, when the mouth attachment member 8 is attached to the mouth portion 5, the anti-slip shape 4c11 is not engaged with the mouth attachment member 8 in the circumferential direction, and the grip portion 4c10 is attached to the mouth attachment member 8. It is preferable that the grip portion 4c10 is not covered by the mouth mounting member 8. This makes it possible to grip the grip portion 4c10 with the mouth attachment member 8 attached. The uneven shape 4c12 is, for example, a knurl. The knurling may be flat or cross-grained. It is preferable that the grip portion 4c10 has a length that allows the user to easily grip it by hand. The length of the grip portion 4c10 is, for example, 15 mm or more, preferably 15 to 100 mm, and more preferably 30 to 70 mm. Specifically, this length is, for example, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100 mm, and here It may be in the range between any two of the numerical values exemplified above or more than any one.

As shown in FIG. 4, a cam protrusion 4g and an engagement protrusion 4h are provided on the outer peripheral surface of the inner bag main body 4d. The engagement protrusion 4h is provided on the cam protrusion 4g. The lower surfaces of the cam convex portion 4g and the engagement convex portion 4h are respectively inclined so as to approach the open end 5c as they proceed counterclockwise when viewed from the open end 5c side of the mouth portion 5.

As shown in FIG. 5, the inner peripheral surface of the outer shell 3 is provided with a cam rail 3l, an engagement recess 3m, and an engagement protrusion 3n. The engagement recess 3m is provided such that the lower surface of the engagement recess 3m is continuous with the upper surface of the cam rail 3l. The upper surface of the cam rail 3l and the lower surface of the engagement recess 3m are inclined so as to approach the opening end 3a as they proceed counterclockwise when viewed from the opening end 3a side. The engagement convex portion 3n is arranged at a position adjacent to the engagement recess 3m.

Before the inner bag 4 is pulled out from the container body 2, the engagement protrusion 4h is disposed within the engagement recess 3m, and the lower surface of the cam protrusion 4g is in contact with the upper surface of the cam rail 3l. A cam mechanism 31 is constituted by the cam convex portion 4g and the cam rail 3l. In this embodiment, the engagement recess 3m is a through hole, but may be a non-through hole.

When an attempt is made to rotate the inner bag 4 counterclockwise, the engagement protrusion 4h comes into contact with the engagement protrusion 3n, and the rotation is restricted. This regulation is not strong, and when a strong torque is applied to the inner bag 4, the engagement protrusion 4h overcomes the engagement protrusion 3n, and the inner bag 4 becomes freely rotatable relative to the outer shell 3. Then, when the inner bag 4 is further rotated counterclockwise, the inner bag 4 moves 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 reduced in diameter.

An enlarged diameter structure 4k is provided at the open end 4l of the inner bag 4. The expanded diameter structure 4k increases the rigidity of the opening 5 of the inner bag 4 and suppresses deformation of the opening 5 of the inner bag 4.

<Removal of inner bag 4>
In the double container 1 of this embodiment, the inner bag 4 moves in the direction of coming out of the container body 2 as the inner bag 4 rotates due to the action of the cam mechanism 31 provided between the inner bag 4 and the outer shell 3. configured to do so.

Therefore, the inner bag 4 can be moved in the direction of coming out of the container body 2 simply by gripping and rotating the gripping part 4c10, and after that, by gripping and pulling the gripping part 4c10, the inner bag 4 can be moved. It can be pulled out from the container body 2. In other words, the inner bag 4 can be pulled out simply by turning and pulling the grip part 4c10, so the operation required to pull out the inner bag 4 becomes very simple. Since the gripping portion 4c10 is provided with a non-slip shape 4c11, it is easy to rotate or pull the inner bag 4 by gripping the gripping portion 4c10. Moreover, it is preferable that the rotation of the grip part 4c10 at this time is rotation in the normal screw loosening direction (that is, in the counterclockwise direction when viewed from the upper side of the double container 1). In this case, there is an advantage that it is easy to intuitively understand that the inner bag 4 moves in the direction of coming out of the container body 2.

Further, since the body 6 of the container body 2 has a larger outer diameter than the mouth 5, it is not easy to pull out the inner bag 4 through the mouth 5 of the outer shell 3 by simply pulling the inner bag 4. However, by rotating the opening 5 of the inner bag 4 and twisting the inner bag 4 to reduce the diameter of the trunk 6 of the inner bag 4, the trunk 6 of the inner bag 4 passes through the opening 5 of the outer shell 3. The inner bag 4 can be easily pulled out from the container body 2.

<Detailed structure of mouth attachment member 8>
The spout attachment member 8 is a stopper type and is configured to be attachable to the mouth portion 5 of the container body 2. With the spout attachment member 8 placed over the mouth portion 5, the spout attachment member 8 is attached to the bottom portion 7. By pressing in the direction of , the mouth attachment member 8 can be engaged with and attached to the mouth 5 . Since the capper-type mouth attachment member 8 can be attached simply by pressing, it has the advantage that the process of attaching the mouth attachment member 8 in the content filling line can be simplified.

As shown in FIG. 2, in this embodiment, the mouth attachment member 8 is a cap 8a, and includes an inner stopper 26 and an overcap 27. The inner plug 26 is of a stopper type and is engaged with the mouth portion 5 of the inner bag 4 in the circumferential direction and the axial direction. The overcap 27 is screwed onto the inner stopper 26.

As shown in FIGS. 2, 6, and 8, the overcap 27 includes an outer cylinder 27a, an intermediate cylinder 27b, an inner cylinder 27c, and a top plate 27d.

A knurl 27e is provided on the outer peripheral surface of the outer cylinder 27a, making it easier to grip and rotate the overcap 27. In this case, by rotating the inner bag 4 while gripping both the grip portion 4c10 of the inner bag 4 and the outer peripheral surface of the outer cylinder 27a, the rotation of the inner bag 4 becomes even easier. Further, since there is a step between the gripping portion 4c10 and the outer peripheral surface of the outer cylinder 27a, the inner bag 4 can be pulled by hooking a finger on the step while gripping the gripping portion 4c10. A female threaded portion 27f is provided on the inner peripheral surface of the outer cylinder 27a. The top plate 27d is provided on the upper surface of the outer cylinder 27a. An intermediate cylinder 27b and an inner cylinder 27c are provided on the lower surface of the top plate 27d. The intermediate cylinder 27b is a so-called inner ring that has a smaller diameter than the outer cylinder 27a and is arranged inside the outer cylinder 27a. The inner cylinder 27c has a smaller diameter than the intermediate cylinder 27b, and is arranged inside the intermediate cylinder 27b.

As shown in FIGS. 2 and 6 to 8, the inner plug 26 includes a main body portion 28 and a plug opening portion 32. As shown in FIG. The main body portion 28 and the opening portion 32 are connected to each other via an easily tearable connecting portion 30.

The main body portion 28 includes an outer cylinder 28a, an inner cylinder 28b, an annular projection 28c, an engaging projection 28d, a top plate 28e, a discharge cylinder 28f, and a mounting cylinder 28g. The opening part 32 and the connecting part 30 are arranged inside the discharge cylinder 28f and the inner cylinder 28b. The opening part 32 is provided with an engagement cylinder 32a provided with an engagement part (not shown), and the inner cylinder 27c and the engagement cylinder 32a are engaged in the circumferential direction and the axial direction. According to such a configuration, by rotating the overcap 27 with respect to the main body part 28, it becomes possible to rotate the engagement tube 32a with respect to the main body part and break the connecting part 30. By breaking the connecting part 30, the opening part 32 is separated from the main body part 28, and a communication hole is formed inside the discharge cylinder 28f and the inner cylinder 28b. The contents in the inner bag 4 can be discharged through this flow hole.

A knurl 28i is provided on the outer peripheral surface of the outer cylinder 27a, making it easier to grip and rotate the inner stopper 26. The top plate 28e is provided on the upper surface of the outer cylinder 28a. An inner cylinder 28b is provided on the lower surface of the top plate 28e. The inner cylinder 28b is a so-called inner ring that has a smaller diameter than the outer cylinder 28a and is arranged inside the outer cylinder 28a. When the inner plug 26 is attached to the mouth portion 5, the inner cylinder 28b is inserted into the inner bag 4, and the outer peripheral surface of the inner cylinder 28b is brought into close contact with the inner peripheral surface of the inner bag 4.

A discharge cylinder 28f and a mounting cylinder 28g are provided on the upper surface of the top plate 28e. The contents in the inner bag 4 are discharged through the discharge tube 28f. As shown in FIG. 2, a male threaded portion 28h is provided on the outer circumferential surface of the mounting tube 28g, and a female threaded portion 28h is provided on the inner circumferential surface of the outer tube 27a of the overcap 27. By engaging with 27f, the overcap 27 is screwed onto the inner stopper 26. In this case, the overcap 27 can be attached to and removed from the inner plug 26 by rotating the overcap 27 relative to the inner plug 26. When the overcap 27 is attached to the inner stopper 26, the intermediate cylinder 27b is inserted into the discharge cylinder 28f, and the outer circumferential surface of the intermediate cylinder 27b is brought into close contact with the inner circumferential surface of the discharge cylinder 28f. The upper side of the discharge cylinder 28f is closed by the overcap 27.

The annular convex portion 28c is an annular convex portion provided on the inner circumferential surface of the outer cylinder 28a so as to extend in the circumferential direction. When the annular convex portion 28c engages with the engagement convex portion 4c2 in the axial direction, the main body portion 28 engages with the mouth portion 5 of the inner bag 4 in the axial direction. It is preferable that the engagement convex portions 28d are provided at a plurality of locations (eight locations in this embodiment) spaced apart in the circumferential direction. The engagement convex portion 28d is disposed on the annular convex portion 28c, and is provided so as to protrude radially inward from the annular convex portion 28c. The engaging convex portion 28d is arranged between the adjacent engaging convex portions 4c2, so that the main body portion 28 engages with the mouth portion 5 of the inner bag 4 in the circumferential direction.

<Rotation direction of overcap 27 and inner bag 4>
The overcap 27 is preferably screwed onto the inner stopper 26 with a normal thread. Therefore, by rotating the overcap 27 with respect to the inner plug 26 in the normal screw loosening direction, the overcap 27 and the inner plug 26 can be unscrewed from each other. Further, by rotating the inner bag 4 with respect to the outer shell 3 in the direction of loosening the normal screw, the inner bag 4 is configured to move in the direction of coming out of the container body 2. In this way, the overcap 27 can be removed by rotating the overcap 27 in the direction of loosening the normal screws, and the inner bag 4 can be lifted up by rotating the inner bag 4 in the direction of loosening the normal screws. . Since both operations are performed in the same direction of rotation, they have the advantage of being simple to operate.

1-2. Method for Manufacturing Double Container 1 As shown in FIGS. 9 and 10, the container body 2 can be formed by heating a preform 15 and performing biaxial stretch blow molding.

<Configuration of inner preform 14, outer preform 13, and preform 15>
In one example, the preform 15 can be configured by covering an inner preform 14, which will become the inner bag 4, with an outer preform 13, which will become the outer shell 3.

As shown in FIG. 9, the inner preform 14 has a bottomed cylindrical shape and includes a mouth portion 14a, a body portion 14b, and a bottom portion 14c. A protrusion 14d is provided at the open end of the mouth 14a. The protruding part 14d does not deform during molding and becomes the protruding part 4c in its original shape. Therefore, the matters described regarding the protrusion 4c also apply to the protrusion 14d. The protruding portion 14d is provided with an engaging portion 14m. The engaging portion 14m becomes the engaging portion 4m after molding. The bottom portion 14c is provided to close the lower end of the body portion 14b. A positioning pin (not shown) may be provided on the bottom portion 14c.

As shown in FIG. 9, 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 to close the lower end of the body portion 13b. The bottom portion 13c is provided with an annular convex portion 13d and a positioning hole (not shown).

As shown in FIG. 10, a preform 15 can be formed by covering the inner preform 14 with the outer preform 13. If the inner preform 14 is provided with a positioning pin, the positioning pin can be inserted into the positioning hole of the outer preform 13 to position the inner preform 14 and the outer preform 13 relative to each other. In the preform 15, the opening 14a and the opening 13a face each other, and the body 14b and the body 13b face each other.

The mouth parts 13a and 14a become the mouth part 15a of the preform 15, the body parts 13b and 14b become the body part 15b of the preform 15, and the bottom parts 13c and 14c become the bottom part 15c of the preform 15. The body portion 15b and the bottom portion 15c are mainly stretched in biaxial stretch blow molding.

<Materials and manufacturing method 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, injection molding, or the like of a thermoplastic resin such as polyester (eg, PET) or polyolefin (eg, polypropylene, polyethylene). In one example, the inner preform 14 is made of polyolefin (eg polypropylene) and the outer preform 13 is made of PET. The polyolefin used for the inner preform 14 is preferably polypropylene rather than polyethylene. This is because the temperature at which polypropylene is suitable for biaxial stretch blow molding is closer to that of PET than polyethylene.

The preform 15 may be constructed by separately manufacturing the inner preform 14 and the outer preform 13 and then covering the inner preform 14 with the outer preform 13, or may be manufactured by multilayer injection molding or two-color molding. Good too. By either method, a preform 15 configured by laminating an inner preform 14 and an outer preform 13 can be obtained.

In multilayer injection molding, a multilayer preform 15 having layers corresponding to each of the inner preform 14 and the outer preform 13 can be manufactured by one injection molding.

In two-color molding, one of the inner preform 14 and the outer preform 13 is molded in the first molding step, and the other of the inner preform 14 and the outer preform 13 is molded in the second molding step. The first molding step may be direct blow molding or injection molding. The second molding step is preferably injection molding.

<Manufacture of inner preform 14 by direct blow molding>
The inner preform 14 is preferably formed by direct blow molding using a molten cylindrical parison. With direct blow molding, it is easier to make the inner bag 4 thinner and multi-layered than with injection molding, so by forming the inner preform 14 with direct blow molding, it is possible to make the inner bag 4 thinner, and it is possible to make the inner bag 4 thinner than with injection molding. It is easy to form the inner bag 4.
<Protruding seal portion 42>
The seal portion formed by welding the inner surfaces of the cylindrical parison to each other may have insufficient strength, so as shown in FIG. Preferably, the protruding seal portion 42 is used. The protruding seal portion 42 is formed by welding the inner surfaces of a cylindrical parison together, and protrudes from the main body portion 14q of the inner preform 14. The main body portion 14q refers to a portion of the inner preform 14 other than the protruding seal portion 42. As shown in FIG. 9, by protruding the seal portion 43 to form the protruding seal portion 42, the area of the sealing surface is increased and the sealing strength of the seal portion 43 is increased.

1-3. Modifications The present invention can also be implemented in the following forms.
- In the above embodiment, the inner bag 4 is pulled out with the mouth attachment member 8 attached to the mouth 5, but the inner bag 4 is pulled out after the mouth attachment member 8 is removed. Good too. An example of the removable mouth attachment member 8 is one having an inner stopper 26 having a structure including a removable band portion, as shown in the third embodiment.
- In the above embodiment, the mouth attachment member 8 is engaged only with the inner bag 4, but the mouth attachment member 8 is engaged only with the outer shell 3 or with both the outer shell 3 and the inner bag 4. You may also do so.
- The mouth attachment member 8 may be engaged with the mouth 5 of the inner bag 4 only in the circumferential direction.
- The mouth attachment member 8 may be of a screw type and attached to the mouth 5.
- The cam mechanism 31 can be omitted. Even in this case, by twisting the inner bag 4, the diameter of the inner bag 4 is reduced, making it easier to pull out.
- The inner bag 4 may be pulled out without twisting.

2. Second Embodiment A second embodiment of the present invention will be described using FIGS. 11 to 14. This embodiment differs from the first embodiment in the configuration of the gripping portion 4c10 of the inner bag 4, but the other configurations are the same as in the first embodiment.

In the present embodiment, as shown in FIGS. 11 to 14, the gripping portion 4c10 has a non-slip shape 4c11, and a mounting portion 8b (in this embodiment, a middle A protruding portion 4c13 is provided that protrudes further in the radial direction than the outer edge 8b1 of the stopper 26). Although the number of protrusions 4c13 is two in this embodiment, it may be one or three or more. The number of protrusions 4c13 is, for example, 1 to 20, specifically, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, and It may be a range between any two numerical values. It is preferable that the plurality of protrusions 4c13 are arranged at equal intervals. It is preferable that the protruding portion 4c13 is tapered. It is preferable that the protruding portion 4c13 has a rounded tip.

By providing the protruding part 4c13 on the gripping part 4c10, it becomes easy to rotate the inner bag 4 or pull the inner bag 4 by hooking a finger on the protruding part 4c13. Therefore, it becomes easy to twist or pull out the inner bag 4 by gripping the gripping portion 4c10.

The inner bag 4 of this embodiment is not provided with the contact flange 4c4, and the lower surface of the gripping portion 4c10 contacts the open end 3a of the outer shell 3, so that the inner bag 4 is moved against the outer shell 3. axially positioned. In other words, the grip portion 4c10 also has the function of the abutment flange 4c4 of the first embodiment.

If the distance from the central axis C of the mouth portion 5 to the outer edge 8b1 is Rc, and the distance to the outer edge of the protruding portion 4c13 is Ra, then Ra/Rc is, for example, 1.1 or more, preferably 1.1 to 3. , 1.2 to 1.8 are more preferable, and specifically, for example, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.5, 3.0, and may be in the range between any two of the numerical values exemplified here.

Moreover, if the part between adjacent protrusions 4c13 and the shortest distance from the central axis C is defined as the minimum diameter part 4c14, and the distance from the central axis C to the outer edge of the minimum diameter part 4c14 is Rb, then (Ra -Rb)/Rc is, for example, 0.1 or more, preferably 0.1 to 2.0, more preferably 0.2 to 0.8, and specifically, for example, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1. 5, 2.0, and may be in the range between any two of the numerical values exemplified here.

Furthermore, the value of (Ra-Rc) and the value of (Ra-Rb) are each, for example, 3 mm or more, preferably 5 mm or more, and more preferably 10 mm or more. This value is, for example, 3 to 50 mm, preferably 15 to 40 mm, and specifically, for example, 3, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 mm, where The range may be between any two of the exemplified numerical values.

3. Third Embodiment A third embodiment of the present invention will be described using FIGS. 15 to 20. This embodiment differs from the first embodiment in the configurations of the mouth attachment member 8 and the inner bag 4, but the other configurations are similar to the first embodiment.

In this embodiment, as shown in FIGS. 15 to 17, the inner bag 4 is not provided with a gripping part 4c10 having an anti-slip shape 4c11, and the distance between the engaging part 4m and the abutting flange 4c4 is is shorter than in the first embodiment.

As shown in FIGS. 15 to 16 and 18 to 20, the mouth attachment member 8 is the same as the first embodiment in that it is a cap 8a that includes an inner stopper 26 and an overcap 27. The structures of the inner plug 26 and the overcap 27 are respectively different from those of the first embodiment.

In this embodiment, the inner stopper 26 includes a main body portion 28 , a band portion 29 , and an opening portion 32 . The main body portion 28 and the band portion 29 are connected to each other via an easily tearable connecting portion 47. The main body portion 28 and the opening portion 32 are connected to each other via an easily tearable connecting portion 30.

The band portion 29 engages with the mouth portion 5 of the inner bag 4 in the axial direction. Therefore, movement of the band portion 29 in the axial direction with respect to the mouth portion 5 of the inner bag 4 is restricted. The band portion 29 may or may not be engaged with the mouth portion 5 of the inner bag 4 in the circumferential direction. When the band portion 29 is engaged with the opening portion 5 of the inner bag 4 in the circumferential direction, movement of the band portion 29 in the circumferential direction with respect to the opening portion 5 of the inner bag 4 is restricted.

The connecting portion 47 is configured to be able to be torn apart by applying force (shearing force, rotational force, etc.) between the main body portion 28 and the band portion 29. The connecting portion 47 is preferably thinner than the main body portion 28 and the band portion 29.

The band portion 29 includes an outer cylinder 29a and an inner cylinder 29b. Inner cylinder 29b is arranged inside outer cylinder 29a. The outer cylinder 29a and the inner cylinder 29b are connected at the lower end of the band part 29, and the inner cylinder 29b is connected to the main body part 28 via the connecting part 47. The inner cylinder 29b is arranged so as to surround the annular convex portion 4c5. An annular convex portion 29c extending in the circumferential direction is provided on the inner peripheral surface of the inner cylinder 29b. The annular convex portion 29c engages with the annular convex portion 4c5 in the axial direction, so that the band portion 29 engages with the mouth portion 5 of the inner bag 4 in the axial direction. A tapered surface is provided on the lower side of the annular protrusion 29c, reducing the force required for the annular protrusion 29c to overcome the annular protrusion 4c5.

The outer tube 29a of the band portion 29 is provided with a tear initiation portion (not shown). The tear initiation part is composed of a thin wall part, a notch, a cut, etc. The band portion 29 can be removed by tearing the connecting portion 47 after starting tearing at the tear initiation portion. Then, by removing the band portion 29, the mouth attachment member 8 can be removed from the mouth.

The main body part 28 of this embodiment differs from the main body part 28 of the first embodiment in that an annular convex part 28c, an engaging convex part 28d, and a knurl 28i are not provided, but other points are similar. The configuration of the cap opening section 32 of this embodiment is the same as that of the cap opening section 32 of the first embodiment.

The overcap 27 differs from the first embodiment in that an engaging protrusion 27g is provided on the inner peripheral surface of the outer cylinder 27a. It is preferable that the engagement convex portions 27g are provided at a plurality of locations (eight locations in this embodiment) spaced apart in the circumferential direction. The engagement protrusion 27g can engage with the engagement protrusion 4c2 of the inner bag 4 in the circumferential direction. As described above, in this embodiment, the engagement protrusion 4c2, which enables the opening 5 of the inner bag 4 and the overcap 27 to engage in the circumferential direction, is provided on the opening 5 of the inner bag 4 and the overcap 27, respectively. 27g is provided.

<Removal of inner bag 4>
In this embodiment, the inner bag 4 can be pulled out by a method including a mouth attachment member removal process and an inner bag withdrawal process.

First, in the mouth attachment member removal step, the mouth attachment member 8 is removed from the mouth portion 5 . This step can be performed, for example, by removing the band portion 29.

Next, as shown in FIG. 21, in the inner bag pulling process, the inner bag is removed by rotating the twisting jig 46 with the opening 5 of the inner bag 4 and the twisting jig 46 engaged in the circumferential direction. The inner bag 4 is pulled out while or after twisting the inner bag 4.

The twisting jig 46 is a jig used for twisting the inner bag 4, and is preferably configured to be able to engage with the engagement protrusion 4c2 of the opening 5 of the inner bag 4. As the twisting jig 46, the overcap 27 can be used. Since the overcap 27 includes an engaging convex portion 27g, by engaging the engaging convex portion 27g of the overcap 27 with the engaging convex portion 4c2 of the inner bag 4 and rotating the overcap 27, the inner bag can be removed. You can twist 4.

By twisting the inner bag 4, the diameter of the inner bag 4 is reduced, making it easier to pull out the inner bag 4. The twisting jig 46 only needs to be engaged with the opening 5 of the inner bag 4 in the circumferential direction, and may or may not be engaged in the axial direction. When engaged in the axial direction, the inner bag 4 can be pulled out by pulling the twisting jig 46. If they are not engaged in the axial direction, after twisting the inner bag 4, the twisting jig 46 can be removed from the inner bag 4 and used to twist another inner bag 4, or recycled separately from the inner bag 4. You may also perform processing.

1: Double container 2: Container body 3: Outer shell 3a: Opening end 3l: Cam rail 3m: Engagement recess 3n: Engagement protrusion 4: Inner bag 4c: Projection 4c10: Grip 4c11: Non-slip shape 4c12: Uneven shape 4c13 : Projection 4c14 : Minimum diameter part 4c2 : Engagement projection 4c3 : Tapered surface 4c4 : Contact flange 4c5 : Annular projection 4c6 : Lower surface 4c7 : Lower surface 4c8 : Tapered surface 4c9 : Tip cylinder part 4d : Inner bag Main body 4g: Cam protrusion 4h: Engagement protrusion 4k: Expanded diameter structure 4l: Opening end 4m: Engaging portion 5: Mouth 5b: Flange 5c: Opening end 6: Body 6b: Shoulder 6c: Body main body 7 : Bottom part 8 : Mouth part attachment member 8a : Cap 8b : Attachment part 8b1 : Outer edge 13 : Outer preform 13a : Mouth part 13b : Body part 13c : Bottom part 13d : Annular convex part 14 : Inner preform 14a : Mouth part 14b : Body part 14c : Bottom part 14d : Projection part 14m : Engaging part 14q : Main body part 15 : Preform 15a : Mouth part 15b : Body part 15c : Bottom part 26 : Inner plug 27 : Overcap 27a : Outer cylinder 27b : Intermediate cylinder 27c: Inner tube 27d: Top plate 27e: Knurling 27f: Female threaded portion 27g: Engagement convex portion 28: Main body portion 28a: Outer tube 28b: Inner tube 28c: Annular convex portion 28d: Engagement convex portion 28e: Top plate 28f : Discharge cylinder 28g : Mounting cylinder 28h : Male screw part 28i : Knurling 29 : Band part 29a : Outer cylinder 29b : Inner cylinder 29c : Annular convex part 30 : Connecting part 31 : Cam mechanism 32 : Opening part 32a : Engagement cylinder 42 : Protruding seal part 43 : Seal part 46 : Jig 47 : Connecting part C : Central shaft

Claims (9)

A double container comprising a container body and a mouth attachment member,
The mouth attachment member is attached to the mouth of the container body,
The container body includes an inner bag and an outer shell disposed to cover the inner bag,
The inner bag includes a protrusion that protrudes from the open end of the outer shell,
A double container, wherein the protruding portion is provided with a gripping portion having a non-slip shape. The double container according to claim 1,
When the mouth-attachment member is attached to the mouth, the anti-slip shape is not engaged with the mouth-attachment member in the circumferential direction, and the gripping portion is not engaged with the mouth-attachment member in the circumferential direction. Double container, uncovered. The double container according to claim 1 or claim 2,
The non-slip shape is an uneven shape, which is a double container. The double container according to claim 1 or claim 2,
The anti-slip shape includes a protrusion that protrudes in a radial direction beyond an outer edge of a mounting portion of the mouth mounting member that is mounted on the mouth. A double container comprising a container body and a mouth attachment member,
The mouth attachment member includes an inner stopper that is attached to the mouth of the container body, and an overcap that is attached to the inner stopper,
The container body includes an inner bag and an outer shell disposed to cover the inner bag,
The mouth attachment member is configured to be removable from the mouth,
A double container, wherein the opening of the inner bag and the overcap are each provided with an engaging protrusion that allows the opening of the inner bag and the overcap to engage in the circumferential direction. The double container according to claim 5,
The inner stopper is a double container that is attached to the mouth of the inner bag. A method for pulling out the inner bag of a double container,
The double container includes a container body and a mouth attachment member,
The mouth attachment member is attached to the mouth of the container body,
The container body includes an inner bag and an outer shell disposed to cover the inner bag,
The method includes a step of removing the mouth attachment member and a step of pulling out the inner bag,
In the mouth attachment member removal step, the mouth attachment member is removed from the mouth;
In the inner bag drawing step, the inner bag is removed while or after the inner bag is twisted by rotating the twisting jig with the opening of the inner bag and the twisting jig engaged in the circumferential direction. How to extract. 8. The method according to claim 7,
The mouth attachment member includes an inner stopper that is attached to the mouth of the container body, and an overcap that is attached to the inner stopper,
The method, wherein the twisting jig is the overcap. 9. The method according to claim 8,
The method, wherein the inner plug is attached to the mouth of the inner bag.