Double container

Abstract

To provide a double container which allows an inner bag to be easily taken out from an outer shell.SOLUTION: According to the present invention, a double container comprises a container body having an outer shell and an inner bag, and a cap attached to a mouth part of the container body and discharging a content. The mouth part is configured by laminating the outer shell and the inner bag, and at the mouth part, the inner bag has a pull-out part for pulling the inner bag out of the outer shell. The cap has an engagement claw that engages with the pull-out part when the cap is attached to the mouth part.SELECTED DRAWING: Figure 6

Description

[Technical field]

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

[0002] Conventionally, a double container having a container body with an outer shell and an inner bag has been known. For example, Patent Document 1 discloses that a double container (so-called delaminating container) is formed by performing biaxial stretch blow molding in a state where an outer shell preform and an inner bag preform are stacked, so that the inner bag shrinks as the content decreases. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-10741 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the outer shell and inner bag of such a double container are molded from different materials, or when contents remain inside the inner bag after use, it is desirable to separate the outer shell and inner bag when recycling the double container.

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a double container which allows the inner bag to be easily removed from the outer shell. [Means for solving the problem]

[0006] According to the present invention, the following inventions are provided.

[0007] [1] A double container comprising a container body having an outer shell and an inner bag, the double container further comprising a cap that is attached to the mouth of the container body and dispenses the contents, the mouth being constructed by stacking the outer shell and the inner bag, the inner bag at the mouth having a pull-out portion for pulling the inner bag out of the outer shell, and the cap having an engaging claw that engages with the pull-out portion when attached to the mouth.

[0008] According to the present invention, the inner bag has a pull-out portion and an engaging claw that engages with the pull-out portion when the cap is attached to the mouth, so that after use, the cap can be removed from the container body and lifted upwards, thereby making it possible to pull the inner bag out of the outer shell.

[0009] Then, by completely pulling out the inner bag from the outer shell, the outer shell and the inner bag can be easily separated and then separated for disposal, etc.

[0010] [2] The double container according to [1], wherein the engaging claws are formed around the entire circumferential direction.

[0011] By forming the engaging claws around the entire circumference in the circumferential direction, the pull-out portion and the engaging claws can be reliably engaged, and the inner bag can be reliably pulled out after use.

[0012] [3] A double container as described in [2], wherein the cap has a cylindrical portion, the engaging claws are formed around the entire circumferential circumference of the inner surface of the cylindrical portion, the pull-out portion protrudes radially outward around the entire circumferential circumference of the mouth portion, and the pull-out portion and the engaging claws are configured to engage around the entire circumference.

[0013] [4] A double container as described in [1] or [2], wherein the container body has the mouth portion and a storage portion, and the mouth portion has a higher hardness than the storage portion.

[0014] [5] A double container as described in [4], wherein the container body is formed by stacking an outer shell preform forming the outer shell and an inner bag preform forming the inner bag and biaxially stretching blow molding them together, and during the biaxially stretching blow molding, the mouth portion is exposed from the mold so that blow molding is not performed.

[0015] [6] The double container according to any one of [1] to [5], wherein the cap is of a stopper type.

[0016] [7] The double container according to any one of [1] to [6], wherein an upper end of the outer shell abuts against the inner bag over the entire circumferential direction of the mouth portion.

[0017] [8] A double container as described in [7], wherein the container body has the mouth portion and a storage portion, the outer shell has an air inlet hole in the storage portion, and the air inlet hole is provided with a valve member that regulates the flow of air in and out between the intermediate space between the outer shell and the inner bag and the external space.

[0018] [9] A double container as described in any one of [1] to [8], wherein the engaging claw is configured to engage with the pull-out portion when the cap is fully attached to the mouth portion, thereby holding the inner bag in the cap. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a cross-sectional view showing an upper portion of a double container 1 according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is an exploded view showing the double container 1 of FIG. 1 in a state before a cap 3 is attached to a container body 2. [Diagram 3] 2 is an enlarged view showing a state in which a cap 3 is attached to an opening 22 of a container body 2 of the double container 1 in FIG. [Figure 4] FIG. 13 is a schematic diagram showing an example of a process for producing the double container 1, illustrating a process for attaching an inner bag preform 24X to an outer shell preform 23X. [Diagram 5] FIG. 13 is a diagram showing a state in which an outer shell preform 23X and an inner bag preform 24X are stacked on top of each other. [Figure 6] 4 is an explanatory diagram showing a state in which a cap 3 is removed from a container body 2 of the double container 1 in FIG. 3. FIG. [Figure 7] FIG. 7A is a cross-sectional view showing the upper part of double container 1 according to the second embodiment of the present invention, and FIG. 7B is a plan view of spacer 4 provided in double container 1. As shown in FIG. [Figure 8] FIG. 8A is an explanatory diagram showing the state before the spacer 4 in FIG. 7B is removed, and FIG. 8B is an explanatory diagram showing the state after the spacer 4 is removed. [Figure 9] 7B is an explanatory diagram showing a state in which the inner bag 24 is removed from the outer shell 23 of the double container 1 in FIG. 7A. FIG. [Figure 10] FIG. 11 is a schematic diagram showing a mouth portion 22 of a double container 1 according to a third embodiment of the present invention. [Figure 11] 11 is a schematic diagram showing a state in which an inner bag 24 is removed from an outer shell 23 of the double container 1 in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, embodiments of the present invention will be described. Various features shown in the following embodiments can be combined with each other. Also, each feature can be an invention independently.

[0021] 1. First embodiment 1-1. Structure of double container 1 The double container 1 according to the first embodiment of the present invention is a so-called squeeze type, and includes a container body 2 and a cap 3, as shown in FIG.

[0022] The container body 2 includes a storage section 21 that stores the contents, and a mouth section 22 that discharges the contents from the storage section 21. The mouth section 22 includes a male screw section 22a onto which the cap 3 can be attached, as shown in Figures 2 and 3 .

[0023] 1 to 3, the container body 2, i.e., the storage section 21 and the mouth section 22, are configured by laminating an outer shell 23 and an inner bag 24. The outer shell 23 is disposed outside the inner bag 24. The double container 1 of this embodiment is a so-called peelable laminate container, and the inner bag 24 filled with the contents is designed to separate from the outer shell 23 and shrink as the contents decrease.

[0024] 1, the outer shell 23 is provided with an outside air introduction hole 25 in the recess 21a provided in the housing section 21. The outside air introduction hole 25 is a hole for introducing outside air into the intermediate space between the outer shell 23 and the inner bag 24. A valve member 26 for regulating the flow of air in and out of the intermediate space between the outer shell 23 and the inner bag 24 is attached to the outside air introduction hole 25.

[0025] 2, at the upper end of the mouth 22, a flange portion 24a that closes the upper end 23a of the outer shell 23 from above is formed, and a lower surface 24b of the flange portion 24a abuts against the upper end 23a of the outer shell 23. And, as shown in Fig. 2 and Fig. 3, the flange portion 24a has a protruding portion 24a1 whose tip protrudes radially outward beyond the outer edge of the upper end 23a of the outer shell 23 along the circumferential direction, and the protruding portion 24a1 functions as a pull-out portion for pulling the inner bag 24 out from the outer shell 23.

[0026] Here, the container body 2 of this embodiment is formed by doubly combining an outer shell preform 23X forming the outer shell 23 and an inner bag preform 24X forming the inner bag 24, and then heating them with an infrared heater and biaxially stretching blow molding, as shown in Figures 4 and 5.

[0027] In this embodiment, the outer shell preform 23X is a preform (injection molded preform) injection molded using an injection molding machine. However, the outer shell preform 23X can also be molded by extrusion molding or the like. In addition, the constituent material of the outer shell preform 23X, and therefore the constituent material of the molded outer shell 23, can be any thermoplastic resin, and can be appropriately selected according to the application and performance of the double container 1. In order to make the container body 2 a container that has restorability and is self-supporting, for example, it is preferable to select a material with a certain degree of rigidity as the outer shell 23. As the thermoplastic resin, it is preferable to use PET (polyethylene terephthalate), which has excellent recyclability, and it is also preferable to use heat-resistant PET. However, it is also possible to use PE (polyethylene), PP (polypropylene), PEN (polyethylene naphthalate), etc. as the thermoplastic resin.

[0028] The outer shell 23 may also have a multi-layer structure. For example, it may be a two-layer preform, or a three-layer or more preform with an intermediate layer of a resin having gas barrier properties or light-shielding properties, such as Nylon-MXD6 (trade name), Nylon-MXD6+fatty acid salt (trade name), PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer), or PEN (polyethylene naphthalate).

[0029] On the other hand, in this embodiment, the inner bag preform 24X is preferably a tubular molded body molded by direct blow molding in which a molten cylindrical parison is sandwiched between a pair of split dies and air is blown into the parison. However, the inner bag preform 24X can also be molded by injection blow molding in which the preform is reheated and blown. The material of the inner bag preform 24X, and therefore the material of the inner bag 24 to be molded, can be appropriately selected from materials and additives depending on the functionality to be imparted, but it is preferable to use an olefin resin. Examples of the functionality to be imparted include low adsorption, oxygen barrier properties, and light blocking properties. For example, in order to impart low adsorption properties, it is preferable to use a cyclic polyolefin resin or the like. In addition, in order to impart oxygen barrier properties, it is preferable to use EVOH (ethylene vinyl alcohol copolymer), and it is preferable that the EVOH is of a stretchable type. Furthermore, in order to impart light blocking properties, a coloring material, an ultraviolet absorbing agent, or the like may be added. In addition, it is preferable that the inner bag 24 has a multi-layer structure, and it is preferable to have an olefin multi-layer structure, particularly a PE multi-layer structure. In this case, if the innermost layer is made of EVOH, it is possible to prevent the adsorption of citrus components. In addition, since the inner bag 24 is made to be peelable from the outer shell 23, it is preferable to select a material for the inner bag 24 that does not adhere to the material for the outer shell 23.

[0030] Specifically, the layer structure of the inner bag 24 is preferably, for example, from the inside of the container, PE layer / reproduction layer / adhesive layer / EVOH layer / adhesive layer / PE layer. Here, the reproduction layer is made of a material that is recycled from flash generated during molding of the container. When the innermost layer is an EVOH layer, the layer structure of the inner bag 24 is preferably, from the inside of the container, EVOH layer / adhesive layer / EVOH layer / adhesive layer / reproduction layer / PE layer.

[0031] When the outer shell preform 23X and the inner bag preform 24X are stacked together and subjected to biaxial stretch blow molding, the mouth portion 22 is exposed from the mold and is not blow molded. In other words, the shape of the mouth portion 22 of the double container 1 of this embodiment is determined when the outer shell preform 23X and the inner bag preform 24X are molded. Therefore, the outer shell 23 and the inner bag 24 (including the flange portion 24a) at the mouth portion 22 are thicker and harder than the outer shell 23 and the inner bag 24 in the storage portion 21, respectively. In addition, when the outer shell preform 23X and the inner bag preform 24X are stacked together, the upper end 23a of the outer shell preform 23X and the flange portion 24a of the inner bag preform 24X are in contact with each other (see FIG. 5).

[0032] 2, the cap 3 includes a cap body 31 and a cap cover 33 connected to the cap body 31 by a hinge 32. The cap body 31 is composed of three members: a main cap member 34, a check valve 35, and a discharge member 36.

[0033] The main cap member 34 is composed of an outer cylindrical portion 34a as a cylindrical portion, an inner cylindrical portion 34b arranged inside the outer cylindrical portion 34a, and an annular portion 34c connecting the upper ends of these portions. A female thread portion 34d that screws into the male thread portion 22a of the mouth portion 22 of the container body 2 is formed on the inner peripheral surface of the outer cylindrical portion 34a. A valve seat 34e that supports the check valve 35 is formed inside the inner cylindrical portion 34b. An insertion space S into which the tip of the mouth portion 22 of the container body 2 is inserted is formed between the outer cylindrical portion 34a and the inner cylindrical portion 34b.

[0034] The check valve 35 includes a valve body 35a, elastic pieces 35b extending radially from the valve body 35a, and an annular support portion 35c supporting the elastic pieces 35b. The annular support portion 35c is supported at its lower portion by the valve seat 34e, and is held at its upper portion by the discharge member 36 engaging with the annular portion 34c of the cap body 31, and is fixed in the inner tube portion 34b of the main cap member 34. At this time, the valve body 35a is seated in the center of the valve seat 34e. The check valve 35 is configured such that the valve body 35a is pushed up from the valve seat 34e when the pressure in the storage portion 21 (in the inner bag 24) increases. This allows the contents in the storage portion 21 to be discharged from the discharge port 36a of the discharge member 36 by squeezing the storage portion 21 of the container body 2. When the squeeze is stopped, the check valve 35 is closed by the biasing force of the elastic piece 35b of the check valve 35 supporting the valve body 35a. With this configuration, the double container 1 of this embodiment prevents outside air from entering the inner bag 24, thereby suppressing deterioration of the contents.

[0035] The cap 3 of this embodiment also includes an engagement claw 34f as a holding portion that holds the flange portion 24a of the inner bag 24 when attached to the mouth portion 22 of the container body 2. The engagement claw 34f is provided on the inner circumferential surface of the outer tubular portion 34a of the main cap member 34 at a position near the annular portion 34c. Specifically, the engagement claw 34f is a protrusion that protrudes radially inward, in other words, toward the insertion space S. The engagement claw 34f may be formed over the entire circumferential direction on the inner circumferential surface of the outer tubular portion 34a, or may be formed only on a portion of the circumferential direction as long as it engages with the flange portion 24a.

[0036] 1-2. Installing Cap 3 Fig. 2 is an exploded view showing a state before the cap 3 is attached to the container body 2, and Fig. 3 is an enlarged view showing a state in which the cap 3 is attached to the mouth portion 22 of the container body 2. As shown in Figs. 2 and 3, the cap 3 of this embodiment is attached to the container body 2 by inserting the tip of the mouth portion 22 of the container body 2 into the insertion space S, and screwing the female thread portion 34d formed on the outer tubular portion 34a of the cap 3 into the male thread portion 22a formed on the mouth portion 22.

[0037] Here, in the double container 1 of this embodiment, the flange portion 24a of the inner bag 24 on the container body 2 side has a protruding portion 24a1 that protrudes radially outward, and the cap 3 side has an engaging claw 34f on the inner peripheral surface of the outer tubular portion 34a of the main cap member 34. Then, when the cap 3 is completely attached, as shown in FIG. 3, these protruding portion 24a1 and the engaging claw 34f engage with each other, so that the inner bag 24 is held by the cap 3.

[0038] 1-3. Use of double container 1 The double container 1 with the cap 3 attached as described above is a squeeze-type container, and the contents can be discharged by compressing the outer shell 23 with the cap 3 attached to the mouth 22 and the mouth 22 tilted downward. At this time, the valve member 26 is closed as the outer shell 23 is compressed, and as a result, the pressure in the intermediate space between the outer shell 23 and the inner bag 24 increases. When the inner bag 24 is compressed by this pressure, the check valve 35 is pushed by the contents, opening the check valve 35 and allowing the contents to pass through the check valve 35. The contents that have passed through the check valve 35 are discharged from the discharge port 36a of the discharge member 36.

[0039] When the force applied to outer shell 23 is removed after the contents are discharged, outer shell 23 tries to return to its original shape due to a restoring force. Then, the intermediate space is depressurized, opening valve member 26, and outside air is introduced into the intermediate space through outside air inlet hole 25, causing outer shell 23 to return to its original shape. As the pressure in the intermediate space decreases, the pressure applied to the contents also decreases, causing check valve 35 to close, and inner bag 24 to become sealed.

[0040] When the content decreases, the inner bag 24 is thin in the storage section 21 and therefore shrinks away from the outer shell 23 (see FIG. 6). However, the inner bag 24 has rigidity in the mouth section 22 because the blow molding is not performed with the outer shell 23 and the inner bag 24 overlapped as described above. Therefore, even if the inner bag 24 shrinks in the storage section 21 while the double container 1 is in use, the engagement state between the protrusion 24a1 of the flange portion 24a and the engagement claw 34f of the cap 3 is maintained.

[0041] 1-3. Separation method Next, a method of separating the double container 1 for disposal (recycling) thereof will be described, specifically, a method of removing the inner bag 24 from the outer shell 23 and separating the outer shell 23 and the inner bag 24. Note that, in a state in which the cap 3 is attached to the container body 2 before separation, as described above, the protrusion 24a1 formed on the flange portion 24a of the inner bag 24 engages with the engaging claw 34f of the cap 3, thereby holding the inner bag 24 in the cap 3 (see FIG. 3).

[0042] When disposing of the double container 1, the cap 3 is turned to release the screw engagement between the male threaded portion 22a of the container body 2 and the female threaded portion 34d of the cap 3, and the cap 3 is lifted upward relative to the container body 2. Then, the flange portion 24a (projection portion 24a1) of the inner bag 24 and the engagement claw 34f of the cap 3 are maintained in an engaged state, so that the inner bag 24 is lifted up as the cap 3 rises, as shown in Fig. 6. Here, the inner bag 24 is in a state of being peeled off from the outer shell 23 after all the contents have been discharged, and therefore it can be easily pulled out from the outer shell 23.

[0043] As described above, the sorting method for the double container 1 of this embodiment includes a step of separating the inner bag 24 and the outer shell 23 by engaging the engaging claw 34f of the cap 3, which is another member, with the protruding portion 24a1 of the flange portion 24a, which serves as the pull-out portion, and lifting the flange portion 24a up from the upper end 23a of the outer shell 23.

[0044] 1-4.Effects According to the double container 1 of this embodiment, the flange portion 24a of the inner bag 24 has a protruding portion 24a1 that protrudes radially outward from the outer edge of the upper end 23a of the outer shell 23, and the protruding portion 24a1 functions as a pull-out portion for pulling the inner bag 24 out from the outer shell 23. When the cap 3 is attached to the container body 2, the protruding portion 24a1 engages with the engaging claw 34f of the cap 3, so that the inner bag 24 can be pulled out from the outer shell 23 by removing the cap 3 from the container body 2 after use and lifting it upward. By completely pulling the inner bag 24 out from the outer shell 23, the outer shell 23 and the inner bag 24 can be easily separated and disposed of separately.

[0045] In addition, by making the double layer container 1 of this embodiment a peelable laminate container, for example by making the outer shell 23 out of PET and the inner bag 24 out of a multi-layered olefin structure, the inner bag 24 becomes more flexible than when it is also made of PET. When the inner bag 24 is made of PET, the inner bag is not easily shrunk, so a large squeeze force is required when discharging as the content volume decreases, but by making the inner bag 24 out of a multi-layered olefin structure, the feeling of use when squeezing is improved, and it becomes possible to discharge the content with the same squeeze force even if the content decreases. Furthermore, if the inner bag 24 is made of biomass PE, it is possible to make the entire container body 2 out of an eco-friendly material.

[0046] 1-5. Modification of the first embodiment The invention according to the first embodiment can also be implemented in the following aspects.

[0047] (1) In the above embodiment, the flange portion 24a of the inner bag 24 includes the protruding portion 24a1 that protrudes radially outward beyond the outer edge of the upper end 23a of the outer shell 23 over the circumferential direction. However, the flange portion 24a functions as a pull-out portion as long as at least a portion of the flange portion 24a protrudes radially outward beyond the outer edge of the upper end 23a of the outer shell 23. In other words, the protruding portion of the flange portion 24a engages with the engaging claw 34f of the cap 3, allowing the inner bag 24 to be pulled out when the cap 3 is removed.

[0048] (2) In the above embodiment, the mouth 22 of the container body 2 is a screw-type cap having the male thread portion 22a and the cap 3 is a screw-type cap having the female thread portion 34d, but a plugging-type cap 3 may also be used. In the case of a plugging-type cap 3, by configuring the flange portion 24a of the inner bag 24 and the engaging claw 34f of the cap 3 to engage with each other when the cap is plugged, it is possible to remove the cap 3 and pull out the inner bag 24.

[0049] (3) In the above embodiment, the cap 3 has the engagement claws 34f, which are protrusions protruding radially inward, as a holding portion for holding the flange portion 24a (protrusion 24a1). However, as long as the flange portion 24a can be held when the cap 3 is attached, the engagement claws 34f do not have to be provided. Other configurations of the holding portion include, for example, a configuration in which the flange portion 24a is clamped within the insertion space S (see FIG. 2).

[0050] (4) In the above embodiment, the protrusion 24a1 formed on the flange portion 24a is engaged with the cap 3 to pull out the inner bag 24. However, the protrusion 24a1 may not be engaged with the cap 3, and after removing the cap 3, the protrusion 24a1 may be grasped to pull up the flange portion 24a from the upper end 23a of the outer shell 23, thereby separating the inner bag 24 from the outer shell 23.

[0051] 2. Second embodiment Next, a double container 1 according to a second embodiment of the present invention will be described. Since the double container 1 of this embodiment is similar to the double container 1 of the first embodiment, the description of the same components as those of the first embodiment will be omitted below.

[0052] As shown in Fig. 7A, in the container body 2 of the double container 1 of this embodiment, the flange portion 24a of the inner bag 24 does not protrude radially outward beyond the outer edge of the upper end 23a of the outer shell 23. Instead, the pull-out portion for pulling out the inner bag 24 from the outer shell 23 is formed by providing a vertical gap R (see Fig. 8B) in at least a portion of the circumferential direction between the upper end 23a of the outer shell 23 and the flange portion 24a. That is, the flange portion 24a of this embodiment functions as a pull-out portion due to the presence of the gap R between it and the outer shell 23.

[0053] More specifically, in the double container 1 of this embodiment, when the outer shell preform 23X and the inner bag preform 24X are stacked together during the molding process (see FIG. 4), a spacer 4 (see FIG. 7B) is placed between the flange portion 24a of the inner bag 24 and the upper end 23a of the outer shell 23, as shown in FIGS. 7A and 8A. The spacer 4 is arc-shaped and formed in the circumferential direction at the mouth portion 22, and is configured to be removable by being divided into two pieces. However, the double container 1 is used as a container with the pair of spacers 4 placed. Then, when the double container 1 is separated into the outer shell 23 and the inner bag 24 after use, a vertical gap R is formed between the flange portion 24a of the inner bag 24 and the upper end 23a of the outer shell 23 by removing the spacer 4, as shown in FIG. 8B.

[0054] In the double container 1 of this embodiment, by forming a gap R, the flange portion 24a of the inner bag 24 can be easily grasped when separating the double container 1, and the inner bag 24 can be easily pulled out from the outer shell 23, as shown in Figure 9.

[0055] Even with this configuration, it is possible to configure the flange portion 24a with a pull-out portion for pulling out the inner bag 24 from the outer shell 23, and the double container 1 can be easily separated for disposal, etc. In other words, the method for separating the double container 1 in this embodiment can be said to include a step of removing the spacer 4 arranged between the flange portion 24a of the inner bag 24 and the upper end 23a of the outer shell 23, and a step of grasping the flange portion 24a with the spacer 4 removed and pulling the flange portion 24a up from the upper end 23a of the outer shell 23 to separate the inner bag 24 from the outer shell 23.

[0056] 3. Third embodiment Next, a double container 1 according to a third embodiment of the present invention will be described. Since the double container 1 of this embodiment is similar to the double container 1 of the first embodiment, the description of the same components as those of the first embodiment will be omitted below.

[0057] 10, in the container body 2 of the double container 1 of this embodiment, the flange portion 24a of the inner bag 24 does not protrude radially outward beyond the outer edge of the upper end 23a of the outer shell 23. In this embodiment, as in the second embodiment, the pull-out portion for pulling out the inner bag 24 from the outer shell 23 is formed by providing a vertical gap R in at least a portion of the circumferential direction between the upper end 23a of the outer shell 23 and the flange portion 24a. That is, the flange portion 24a of this embodiment functions as a pull-out portion due to the presence of the gap R between it and the outer shell 23.

[0058] More specifically, in the double container 1 of this embodiment, the gap R is formed by providing a recess 24c in a part of the circumferential direction of the lower surface 24b of the flange portion 24a. For example, it is preferable to provide the recess 24c in two places facing each other in the circumferential direction. However, the shape and number of the recesses 24c can be designed arbitrarily as long as it is easy to pull out the inner bag 24 by pinching the flange portion 24a with fingers.

[0059] In the double container 1 of this embodiment, by forming a gap R, the flange portion 24a of the inner bag 24 can be easily grasped when separating the double container 1, and the inner bag 24 can be easily pulled out from the outer shell 23, as shown in Figure 11.

[0060] Even with this configuration, it is possible to configure a pull-out section in the flange section 24a for pulling out the inner bag 24 from the outer shell 23, and the double container 1 can be easily separated for disposal, etc. In other words, the method for separating the double container 1 in this embodiment can be said to be a method including a step of grasping the flange section 24a having the depression 24c and pulling the flange section 24a up from the upper end 23a of the outer shell 23 to separate the inner bag 24 from the outer shell 23.

[0061] In addition, it is also possible to attach a cap 3 having a protrusion that fits into the recess 24c to the container body 2 having the configuration of the inner bag 24 of this embodiment, and to pull out the inner bag 24 by removing the cap 3, as in the first embodiment.

[0062] 4. Other Modifications In the above embodiment, the double container 1 is of a squeeze type, and is configured to discharge the contents by compressing the outer shell 23 with the mouth 22 tilted downward. However, the double container 1 can also be of a pump type in which a pump is attached to the mouth 22 and the contents are sucked up and discharged through a tube inserted into the inner bag 24 by the action of the pump. When using a pump type double container 1, it is preferable to not provide the outside air introduction hole 25 and the valve member 26, but to open the bottom of the storage section 21 and introduce outside air from the bottom.

[0063] The double container 1 of the above embodiment is a laminated peelable container in which the inner bag 24 shrinks as the contents decrease. However, the double container 1 of the present invention may be one in which the inner bag 24 does not shrink when used. That is, in this case, the inner bag 24 is not attached to the outer shell 23, but is not peeled off, and is configured to be easily separated from the outer shell 23. Even in the double container 1 in which the inner bag 24 does not peel off when used, it is possible to separate the inner bag 24 from the outer shell 23 and dispose of it after use by removing the inner bag 24. And, according to this configuration, it becomes possible to use a PET container as a container for dressings and sauces, which are generally not suitable for recycling. In other words, while a material with excellent oxygen barrier properties is used for the inner bag 24, the inner bag 24 can be removed after use, so that the PET outer shell 23 to which no contents are attached can be recycled.

[0064] (Additional Note) Below is an outline of the invention in the original application.

[0065] (Item 1) A double container comprising a container body having an outer shell and an inner bag, the mouth of the container body being formed by stacking the outer shell and the inner bag, and at the mouth, a flange portion is formed at the upper end of the inner bag to cover the upper end of the outer shell from above, and the flange portion has a pull-out portion for pulling out the inner bag from the outer shell.

[0066] According to the present invention, since the flange portion of the inner bag is provided with a pull-out portion, the inner bag can be easily pulled out by pulling up the pull-out portion from the upper end of the mouth of the outer shell.

[0067] Various embodiments of the present invention will be described below. The embodiments described below can be combined with each other.

[0068] (Item 2) The double container according to item 1, A cap is provided which is attached to the mouth portion and discharges the contents, The drawn-out portion is formed by at least a part of the flange portion protruding radially outward beyond an outer edge of an upper end of the outer shell, The double container has a holding portion, the holding portion holding the drawer portion when the cap is attached to the mouth portion. (Item 3) The double container according to item 2, The cap includes a tubular portion having an internal thread formed on an inner circumferential surface thereof, the internal thread being adapted to be screwed into the external thread formed in the mouth portion, The retaining portion is an engaging claw formed at a position above the female threaded portion on the inner surface of the cylindrical portion and engaging with the pull-out portion. (Item 4) The double container according to item 1 or 2, The draw-out portion is formed by providing a vertical gap between the upper end of the outer shell and the flange portion in at least a portion of the circumferential direction. (Item 5) The double container according to item 4, a spacer disposed between the flange portion and an upper end of the outer shell; The gap is formed by removing the spacer. (Item 6) The double container according to item 5, The spacer is formed in a circumferential direction and is configured to be removable by being divided into two or more parts. (Item 7) The double container according to item 4, The gap is formed by providing a recess in a circumferential portion of the lower surface of the flange portion. (Item 8) A double container according to any one of items 1 to 7, wherein the container body is formed by combining an outer shell preform forming the outer shell and an inner bag preform forming the inner bag in a double layer and subjecting the combined products to biaxial stretch blow molding. (Item 9) The double container according to item 8, The outer shell preform is an injection molded preform, and the inner bag preform is a blow molded tubular molding. (Item 10) A double container according to any one of items 1 to 9, A double container configured such that the inner bag shrinks as the contents decrease. (Item 11) A method for separating the double container according to item 1, A sorting method comprising a step of: engaging the pull-out portion with another member and pulling the pull-out portion up from the top end of the outer shell, or gripping the pull-out portion and pulling it up from the top end of the outer shell, thereby separating the inner bag and the outer shell. [Explanation of symbols]

[0069] 1:Double container 2: Container body 3: Cap 4: Spacer 21: Storage unit 21a: Recess 22: Mouth 22a: Male thread 23: Outer shell 23X: Outer shell preform 23a: Upper end 24: Inner bag 24X: Inner bag preform 24a: Flange part 24a1: Protruding part (pulling part) 24b: Bottom surface 24c: hollow 25: Outside air intake 26: Valve member 31: Cap body 32: Hinge 33: Cap cover 34: Main cap member 34a: Outer cylindrical portion (cylindrical portion) 34b: Inner cylinder part 34c: Circular section 34d: Female thread 34e: Valve seat 34f: Engagement claw (holding part) 35: Check valve 35a: Valve body 35b: Elastic piece 35c: Annular support 36: Discharge member 36a:Discharge port R: Gap S: Insertion space

Claims

1. A double container comprising a container body having an outer shell and an inner bag, A cap is provided which is attached to the mouth of the container body and discharges the contents, The mouth portion is formed by laminating the outer shell and the inner bag, At the mouth portion, the inner bag has a pull-out portion for pulling the inner bag out of the outer shell, The cap has an engaging claw that engages with the drawer when the cap is attached to the mouth portion.

2. The double container according to claim 1, The engaging claws are formed around the entire circumference in the circumferential direction.

3. The double container according to claim 2, The cap includes a cylindrical portion. The engaging claw is formed on the inner peripheral surface of the cylindrical portion over the entire circumferential direction, The lead-out portion protrudes radially outward around the entire circumferential circumference of the mouth portion, The drawer portion and the engaging claw are configured to engage with each other around the entire circumference of the double container.

4. The double container according to any one of claims 1 to 3, The container body includes the mouth portion and a storage portion, The mouth portion has a harder hardness than the container portion.

5. The double container according to claim 4, The container body is formed by stacking an outer shell preform forming the outer shell and an inner bag preform forming the inner bag together and performing biaxial stretch blow molding, The double container has a mouth portion exposed from the mold during the biaxially stretched blow molding so that the mouth portion is not subjected to blow molding.

6. The double container according to any one of claims 1 to 5, The cap is a plug-type double container.

7. The double container according to any one of claims 1 to 6, A double container, wherein an upper end of the outer shell abuts against the inner bag over the entire circumferential direction of the mouth portion.

8. The double container according to claim 7, The container body includes the mouth portion and a storage portion, The outer shell has an air inlet hole in the housing portion, The double container has a valve member provided in the air inlet hole for regulating the flow of air between an intermediate space between the outer shell and the inner bag and an outer space.

9. The double container according to any one of claims 1 to 8, The double container, wherein the engaging claw is configured to engage with the drawing portion to hold the inner bag in the cap when the cap is fully attached to the mouth portion.

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