Double container and splitting method thereof

Abstract

A double container is provided that allows easy removal of an inner bag from an outer shell. According to the present invention, a double container is provided that includes a container body having an outer shell and an inner bag. The mouth of the container body is formed by laminating the outer shell and the inner bag. A flange portion is formed at the upper end of the inner bag at the mouth, which covers the upper end of the outer shell from above. The flange portion includes a pull-out portion for pulling the inner bag out of the outer shell.

Description

Technical Field

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

[0002] Conventionally, there are known double containers comprising a container body having an outer shell and an inner bag. For example, Patent Document 1 discloses a technique for forming a double container by biaxially stretching and blow-molding an outer shell preform and an inner bag preform in an overlapping state, thereby reducing the shrinkage of the inner bag as the contents are reduced.

[0003] Prior art documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2019-10741 Summary of the Invention

[0006] (Problems to be solved by the invention)

[0007] When the outer shell and inner bag of such a double container are formed of different materials, or when the contents are attached to the inner bag after use, it is desirable to be able to separate the outer shell and the inner bag for easy recycling of the double container.

[0008] The present invention has been made in view of such circumstances, and provides a double container in which an inner bag can be easily removed from an outer shell.

[0009] (Technical solutions to solve problems)

[0010] According to the present invention, a double container is provided, comprising a container body having an outer shell and an inner bag, wherein the mouth of the container body is formed by laminating the outer shell and the inner bag, and at the mouth, the upper end portion of the inner bag forms a flange portion that covers the upper end of the outer shell from the upper side, and the flange portion has a pull-out portion for pulling the inner bag out from the outer shell.

[0011] According to the present invention, since the flange portion of the inner bag is provided with the 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 portion of the outer shell.

[0012] Hereinafter, various embodiments of the present invention will be described by way of example. The embodiments described below may be combined with each other.

[0013] Preferably, a cap is provided that is mounted on the mouth and discharges the contents, the pull-out portion is formed so that at least a portion of the flange portion protrudes radially outward from the outer edge of the upper end of the housing, and the cap includes a retaining portion that retains the pull-out portion when mounted on the mouth.

[0014] Preferably, the cover includes a cylindrical portion, the inner circumferential surface of the cylindrical portion is formed with an internal thread portion that screws into the external thread portion formed on the mouth portion, and the retaining portion is an engaging claw formed on the inner circumferential surface of the cylindrical portion at a position higher than the internal thread portion and engaged with the pull-out portion.

[0015] The pull-out portion is preferably formed by providing a gap in the vertical direction between the upper end of the housing and the flange portion at least partially in the circumferential direction.

[0016] Preferably, a spacer is provided between the flange portion and the upper end of the housing, and the gap is formed by removing the spacer.

[0017] It is preferable that the spacer is formed along the entire circumference and is configured to be detachable by being divided into two or more pieces.

[0018] The gap is preferably formed by providing a recessed portion in a portion of the lower surface of the flange portion in a circumferential direction.

[0019] The container body is preferably formed by biaxial stretch blow molding by combining an outer shell preform forming the outer shell and an inner bag preform forming the inner bag into a double structure.

[0020] Preferably, the outer shell preform is an injection-molded preform, and the inner bag preform is a blow-molded tubular body.

[0021] Preferably, the inner bag is configured to shrink as the content decreases.

[0022] Furthermore, the present invention provides a method for disassembling the aforementioned double container, comprising: engaging another component with the pullout and pulling the pullout toward the upper end of the outer shell, or grasping the pullout and pulling it from the upper end of the outer shell, thereby separating the inner bag from the outer shell. The disassembly method preferably comprises engaging another component with the pullout and pulling the pullout toward the upper end of the outer shell, or grasping the pullout and pulling it from the upper end of the outer shell, thereby separating the inner bag from the outer shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view showing the upper portion of the double container 1 according to the first embodiment of the present invention.

[0024] Figure 2 It means in Figure 1 Exploded view of the double container 1 before the cover 3 is installed on the container body 2.

[0025] Figure 3 It means in Figure 1An enlarged view of the state in which the lid 3 is installed on the mouth 22 of the container body 2 of the double container 1.

[0026] Figure 4 This is an example of a manufacturing process of the double container 1 and is a schematic diagram showing a process of attaching the inner bag preform 24X to the outer shell preform 23X.

[0027] Figure 5 This is a diagram showing a state where the outer shell preform 23X and the inner bag preform 24X are overlapped.

[0028] Figure 6 It means from Figure 3 1 is an explanatory diagram of a double container 1 after the container body 2 is removed from the cover 3.

[0029] exist Figure 7 middle, Figure 7 A is a cross-sectional view showing the upper portion of a double container 1 according to a second embodiment of the present invention. Figure 7 B is a plan view of the spacer 4 included in the double container 1 .

[0030] exist Figure 8 middle, Figure 8 A means disassembly Figure 7 B is an explanatory diagram of the state before the spacer 4, Figure 8 B is an explanatory diagram showing a state where the spacer 4 is removed.

[0031] Figure 9 It means from Figure 7 A is an explanatory diagram of the double container 1 with the outer shell 23 and the inner bag 24 removed.

[0032] Figure 10 It is a schematic diagram showing the mouth portion 22 of the double container 1 according to the third embodiment of the present invention.

[0033] Figure 11 It means from Figure 10 Schematic diagram of the double container 1 with the outer shell 23 and the inner bag 24 removed. DETAILED DESCRIPTION

[0034] Hereinafter, embodiments of the present invention will be described. The respective features described in the following embodiments can be combined with each other, and each feature independently establishes the present invention.

[0035] 1. First Implementation

[0036] 1-1. Structure of double container 1

[0037] The double container 1 according to the first embodiment of the present invention is a so-called squeeze-type double container. Figure 1 As shown, a container body 2 and a lid 3 are provided.

[0038] The container body 2 includes a receiving portion 21 for receiving the contents and a mouth portion 22 for discharging the contents from the receiving portion 21. Figure 2 and Figure 3 As shown, the mouth portion 22 includes an external thread portion 22 a to which the cap 3 can be mounted.

[0039] like Figures 1 to 3 As shown, the container body 2, namely, the housing portion 21 and the mouth portion 22, is composed of a laminated 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 laminated peelable container, and the inner bag 24, filled with the contents, is configured to separate and shrink from the outer shell 23 as the contents decrease.

[0040] like Figure 1 As shown, the outer shell 23 is provided with an external air inlet hole 25 in the recess 21a provided in the housing portion 21. The external air inlet hole 25 is a hole for introducing external air into the intermediate space between the outer shell 23 and the inner bag 24. A valve member 26 is mounted in the external air inlet hole 25 to regulate the flow of air into and out of the intermediate space between the outer shell 23 and the inner bag 24.

[0041] like Figure 2 As shown, at the mouth 22, a flange portion 24a is formed at the upper end of the inner bag 24 to cover the upper end 23a of the outer shell 23 from above, and the lower surface 24b of the flange portion 24a abuts against the upper end 23a of the outer shell 23. Figure 2 and Figure 3 As shown, the flange portion 24a includes a protrusion 24a1 whose front end protrudes radially outward from the outer edge of the upper end 23a of the housing 23 over the entire circumference. The protrusion 24a1 can be used as a pull-out portion to pull the inner bag 24 out of the housing 23.

[0042] like Figure 4 and Figure 5 As shown, the container body 2 of this embodiment is formed by combining an outer shell preform 23X forming an outer shell 23 and an inner bag preform 24X forming an inner bag 24 into a double structure, which is then heated with an infrared heater and formed by biaxial stretch blow molding.

[0043] In the present embodiment, the shell preform 23X is a preform (injection molded preform) formed by injection molding using an injection molding machine. However, the shell preform 23X can also be formed by using extrusion molding or other methods. In addition, as the constituent material of the shell preform 23X, that is, the constituent material forming the shell 23, any thermoplastic resin can be listed, which can be appropriately selected according to the purpose and performance of the dual container 1. In order to make the container body 2 have resilience and make it a self-supporting container, it is preferred to use a material with a certain degree of rigidity as the shell 23. As the thermoplastic resin, it is preferred to use PET (polyethylene terephthalate) with excellent recyclability, or preferably use heat-resistant PET. However, as thermoplastic resins, PE (polyethylene), PP (polypropylene), PEN (polyethylene naphthalate), etc. can also be used.

[0044] Furthermore, the housing 23 may be formed into a multi-layer structure. For example, it may be a two-layer preform, or a preform composed of three or more layers using a gas-barrier or light-shielding resin such as nylon MXD6, nylon MXD6+fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer), or PEN (polyethylene naphthalate) as an intermediate layer.

[0045] On the other hand, in the present embodiment, the inner bag preform 24X is preferably made into a tubular molded body formed by direct blow molding in which a pair of split molds are used to clamp a molten cylindrical parison and blow air into the parison. Alternatively, the inner bag preform 24X may be formed by injection blow molding in which the preform is reheated and blown. The constituent materials of the inner bag preform 24X (i.e., the constituent materials of the formed inner bag 24) can be appropriately selected according to the functions to be imparted, but olefin resins are preferably used. As the functions to be imparted, low adsorption, oxygen barrier properties, and light-shielding properties can be listed. For example, in order to impart low adsorption, cyclic polyolefin resins are preferably used. In order to impart oxygen barrier properties, EVOH (ethylene vinyl alcohol copolymer) is preferably used. In addition, if it is desired to make a type with suitable ductility, EVOH is also preferred. In order to impart light-shielding properties, coloring materials or ultraviolet absorbers can be added. The inner bag 24 is preferably made into a multilayer structure, which can be an olefin multilayer structure, especially a PE multilayer structure. In this case, if the innermost layer is made of EVOH, the adsorption of citrus components can be prevented. In order to allow the inner bag 24 to be easily peeled from the outer shell 23, it is preferable to select a material that has no adhesiveness between the outer shell 23 components.

[0046] The inner bag 24 preferably has a layer structure of, from the inside of the container, PE layer / recycled layer / adhesive layer / EVOH layer / adhesive layer / PE layer in this order. The recycled layer here refers to a layer made from recycled flash generated during container molding. If the innermost layer is an EVOH layer, the inner bag 24 preferably has a layer structure of, from the inside of the container, EVOH layer / adhesive layer / EVOH layer / adhesive layer / recycled layer / PE layer in this order.

[0047] It should be noted that when the outer shell preform 23X and the inner bag preform 24X are overlapped and subjected to biaxial stretch blow molding, the mouth 22 is exposed from the mold without being blow-molded. That is, the shape of the mouth 22 of the double container 1 of this embodiment is determined when the outer shell preform 23X and the inner bag preform 24X are formed. Therefore, the outer shell 23 and the inner bag 24 (including the flange portion 24a) at the mouth 22 are thicker than the outer shell 23 and the inner bag 24 at the receiving portion 21, respectively, and have high hardness. In addition, in a state where the outer shell preform 23X and the inner bag preform 24X are overlapped with each other, the upper end 23a of the outer shell preform 23X and the flange portion 24a of the inner bag preform 24X abut against each other (refer to Figure 5 ).

[0048] like Figure 2 As shown, the cap 3 includes a cap body 31 and a cap cover 33 connected to the cap body 31 via a hinge 32. The cap body 31 is composed of three parts: a main cap member 34, a check valve 35, and a discharge member 36.

[0049] The main cover member 34 is composed of an outer cylindrical portion 34a, an inner cylindrical portion 34b disposed within the outer cylindrical portion 34a, and an annular portion 34c connecting the upper ends of these components. The inner circumferential surface of the outer cylindrical portion 34a is formed with an internal threaded portion 34D that screws into the external threaded portion 22a of the mouth 22 of the container body 2. Furthermore, a valve seat 34E that supports the check valve 35 is formed inside the inner cylindrical portion 34b. An insertion space S is formed between the outer cylindrical portion 34a and the inner cylindrical portion 34b, into which the front end of the mouth 22 of the container body 2 is inserted.

[0050] The check valve 35 includes a valve body 35a, an elastic piece 35b extending radially from the valve body 35a, and an annular support portion 35c that supports the elastic piece 35b. The annular support portion 35c is supported from below by the valve seat 34E and held from above by the discharge member 36, which engages with the annular portion 34c of the cap body 31. The check valve 35 is secured within the inner cylindrical portion 34b of the main cap member 34. The valve body 35a is located in the center of the valve seat 34E. The check valve 35 is configured so that when the pressure within the container 21 (inside the inner bag 24) rises, the valve body 35a is pushed up from the valve seat 34E. This allows the contents of the container 21 to be discharged from the discharge port 36a of the discharge member 36 by squeezing the container 21 of the container body 2. Furthermore, when squeezing stops, the thrust of the elastic piece 35b of the check valve 35, which supports the valve body 35a, closes the check valve 35. With such a structure, in the double container 1 of the present embodiment, it is possible to prevent external air from flowing into the inner bag 24, thereby suppressing deterioration of the contents.

[0051] The lid 3 of this embodiment includes an engaging claw 34f that serves as a retaining portion for retaining the flange portion 24a of the inner bag 24 when attached to the mouth portion 22 of the container body 2. The engaging claw 34f is provided on the inner circumferential surface of the outer cylindrical portion 34a of the main lid member 34, near the annular portion 34c. The engaging claw 34f is specifically a protrusion that projects radially inward (in other words, toward the insertion space S). The engaging claw 34f can be formed along the entire circumference of the inner circumferential surface of the outer cylindrical portion 34a, but can also be formed on a portion of the circumference as long as it can engage with the flange portion 24a.

[0052] 1-2. Installation of cover 3

[0053] Figure 2 This is an exploded view showing a state before the cover 3 is attached to the container body 2. Figure 3 2 is an enlarged view showing a state where the cap 3 is mounted on the mouth 22 of the container body 2. Figure 2 and Figure 3 As shown, the cap 3 of this embodiment is installed on the container body 2 by inserting the front end of the mouth 22 of the container body 2 into its insertion space S and screwing the internal thread portion 34D formed on the outer tube portion 34a of the cap 3 onto the external thread portion 22a formed on the mouth 22.

[0054] The double container 1 of this embodiment has a protrusion 24a1 protruding radially outward on the flange 24a of the inner bag 24 on the container body 2 side, and an engaging claw 34f is provided on the inner peripheral surface of the outer cylindrical portion 34a of the main cover member 34 on the cover 3 side. When the cover 3 is completely installed, as shown in FIG. Figure 3 As shown, the protrusion 24 a 1 is engaged with the engaging claw 34 f , so that the inner bag 24 is held by the lid 3 .

[0055] 1-3. Use of double container 1

[0056] The double container 1, with the lid 3 attached as described above, is a squeeze-type container. With the lid 3 attached to the mouth 22 and the mouth 22 tilted downward, the contents are discharged by compressing the outer shell 23. At this point, the valve member 26 closes as the outer shell 23 is compressed. As a result, the pressure in the space between the outer shell 23 and the inner bag 24 increases. This pressure compresses the inner bag 24, squeezing the contents against the check valve 35, opening it and allowing the contents to pass through it. The contents, having passed through the check valve 35, are discharged from the discharge port 36a of the discharge member 36.

[0057] After the contents are expelled and the force acting on outer shell 23 is removed, outer shell 23 attempts to return to its original shape due to its restorative force. At this point, valve member 26 opens due to the reduced pressure in the intermediate space, allowing external air to enter the intermediate space through external air inlet 25, ultimately returning outer shell 23 to its original shape. As the pressure in the intermediate space decreases, the pressure on the contents also decreases, closing check valve 35 and sealing inner bag 24.

[0058] It should be noted that when the contents are reduced, the inner bag 24 will separate and shrink from the outer shell 23 due to the thin structure at the receiving portion 21 (see Figure 6 However, as described above, since the outer shell 23 and inner bag 24 at the mouth 22 are not blow-molded while overlapping, the inner bag 24 has rigidity. Therefore, even if the inner bag 24 at the housing 21 contracts during use of the dual container 1, the engagement between the protrusion 24a1 of the flange 24a and the engaging claw 34f of the lid 3 is maintained.

[0059] 1-3. Splitting method

[0060] Next, a method for separating the double container 1 when discarding (recycling) the double container 1 (specifically, a method for removing the inner bag 24 from the outer shell 23 and separating the outer shell 23 and the inner bag 24) will be described. It should be noted that, in a state where the lid 3 is attached to the container body 2 before separation, the protrusion 24a1 formed on the flange 24a of the inner bag 24 engages with the engaging claw 34f of the lid 3 as described above, and the inner bag 24 is retained on the lid 3 (see FIG. Figure 3 ).

[0061] When the double container 1 is discarded, the cap 3 is rotated to release the screw engagement between the external thread portion 22a of the container body 2 and the internal thread portion 34D of the cap 3, and the cap 3 is lifted upward relative to the container body 2. Since the flange portion 24a (protrusion 24a1) of the inner bag 24 and the engaging claw 34f of the cap 3 are kept engaged, as shown in FIG. Figure 6As shown, the inner bag 24 is pulled up as the lid 3 rises. At this time, the inner bag 24 is in a state of being peeled off from the outer shell 23 after the contents are completely discharged, so that it can be easily pulled out from the outer shell 23.

[0062] As described above, the disassembly method of the double container 1 of this embodiment is a method having a process of separating the inner bag 24 and the outer shell 23 by engaging the protrusion 24a1 of the flange portion 24a serving as the pull-out portion with the engaging claw 34f of the cover 3 serving as another component, and pulling up the flange portion 24a from the upper end 23a of the outer shell 23.

[0063] 1-4. Effects

[0064] According to the dual container 1 of this embodiment, the flange portion 24a of the inner bag 24 includes a protrusion 24a1 that protrudes radially outward from the outer edge of the upper end 23a of the outer shell 23. This protrusion 24a1 functions as a pull-out portion for pulling the inner bag 24 out of the outer shell 23. When the lid 3 is attached to the container body 2, the protrusion 24a1 engages with the engaging claws 34f of the lid 3. After use, the lid 3 is removed from the container body 2 and lifted upward, allowing the inner bag 24 to be pulled out of the outer shell 23. By completely pulling the inner bag 24 out of the outer shell 23, the outer shell 23 and inner bag 24 can be easily separated, allowing them to be disassembled and disposed of.

[0065] The double container 1 of this embodiment can be constructed as a laminated peelable container. For example, the outer shell 23 can be made of PET, and the inner bag 24 can be constructed of a multilayer olefin structure. This design makes the inner bag 24 more flexible than a structure in which the inner bag 24 is also constructed of PET. When the inner bag 24 is constructed of PET, it is less likely to shrink, requiring greater squeezing force to discharge the contents as the contents decrease. However, when the inner bag 24 is constructed of a multilayer olefin structure, the feel during squeezing is improved, allowing the contents to be discharged with the same squeezing force even when the contents decrease. Furthermore, if the inner bag 24 is constructed of biomass PE, the entire container body 2 can be made of an environmentally friendly material.

[0066] 1-5. Modification of the First Embodiment

[0067] It should be noted that the invention according to the first embodiment described above can also be implemented in the following various forms.

[0068] (1) In the above embodiment, the flange portion 24a of the inner bag 24 includes a protrusion 24a1 that protrudes radially outward from the outer edge of the upper end 23a of the outer shell 23 over the entire circumference. However, the flange portion 24a can function as a pull-out portion as long as at least a portion thereof protrudes radially outward from the outer edge of the upper end 23a of the outer shell 23. In other words, by engaging this protruding portion of the flange portion 24a with the engaging claw 34f of the lid 3, the inner bag 24 can be pulled out when the lid 3 is removed.

[0069] (2) In the above embodiment, the mouth portion 22 of the container body 2 has the external thread portion 22a, and the cap 3 is a screw-type cap having the internal thread portion 34D. However, a plug-type cap 3 may also be used. In the case of a plug-type cap 3, the flange portion 24a of the inner bag 24 may be engaged with the engaging claw 34f of the cap 3 when plugged, so that the inner bag 24 can be pulled out simultaneously with the removal of the cap 3.

[0070] (3) In the above embodiment, the cover 3 has the protruding engaging claw 34f protruding radially inward as a retaining portion for retaining the flange portion 24a (protruding portion 24a1). However, as long as the flange portion 24a can be retained when the cover 3 is installed, the engaging claw 34f may not be provided. Other structures of the retaining portion include, for example, a portion inserted into the space S (see FIG. Figure 2 ) structure in which the flange portion 24a is clamped.

[0071] (4) In the above embodiment, the inner bag 24 is pulled out by engaging the protrusion 24a1 formed on the flange portion 24a with the lid 3. However, the protrusion 24a1 may not be engaged with the lid 3, and after removing the lid 3, the flange portion 24a may be pulled up from the upper end 23a of the outer shell 23 by gripping the protrusion 24a1, thereby separating the inner bag 24 from the outer shell 23.

[0072] 2. Second Implementation

[0073] 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 following description will omit details regarding the same components as those of the first embodiment.

[0074] like Figure 7 As shown in FIG. 1A , the flange portion 24a of the inner bag 24 of the container body 2 of the double container 1 of this embodiment does not protrude radially outward from the outer edge of the upper end 23a of the outer shell 23. Instead, a pull-out portion for pulling out the inner bag 24 from the outer shell 23 is provided with a vertical gap R (see FIG. 1B ) in at least a portion of the circumference between the upper end 23a of the outer shell 23 and the flange portion 24a. Figure 8That is, the flange portion 24a of this embodiment functions as a pull-out portion by having a gap R between the flange portion 24a and the housing 23.

[0075] More specifically, the double container 1 of this embodiment is formed during the forming process (for example, when the outer shell preform 23X and the inner bag preform 24X overlap, refer to Figure 4 ),like Figure 7 A and Figure 8 As shown in FIG. 2A , a spacer 4 is arranged between the flange portion 24a of the inner bag 24 and the upper end 23a of the outer shell 23 (see FIG. Figure 7 B) The spacer 4 is arc-shaped and formed along the entire circumference of the mouth 22. It is configured to be split into two parts so that it can be disassembled. However, the double container 1 is used as a container in a state where a pair of spacers 4 are arranged. After the double container 1 is used, if it is desired to separate the double container 1 into the outer shell 23 and the inner bag 24, as shown in FIG. Figure 8 As shown in FIG. 2B , by removing the spacer 4 , a gap R in the vertical direction can be formed between the flange portion 24 a of the inner bag 24 and the upper end 23 a of the outer shell 23 .

[0076] The double container 1 of this embodiment forms a gap R, so that the flange portion 24a of the inner bag 24 can be easily clamped when the double container 1 is separated. Figure 9 As shown, the inner bag 24 can be easily pulled out from the outer shell 23.

[0077] Even with this structure, a pull-out portion for pulling the inner bag 24 out of the outer shell 23 can be formed on the flange portion 24a, thereby facilitating disassembly and disposal of the double container 1. Specifically, the method for disassembling the double container 1 in this embodiment can be described as comprising: a step of removing the spacer 4 disposed 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 and pulling it up from the upper end 23a of the outer shell 23 after the spacer 4 is removed, thereby separating the inner bag 24 from the outer shell 23.

[0078] 3. Third Implementation Method

[0079] 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 following description will omit details regarding the same components as those of the first embodiment.

[0080] like Figure 10As shown, the flange portion 24a of the inner bag 24 of the container body 2 of the dual container 1 of this embodiment 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 drawer for drawing the inner bag 24 from the outer shell 23 is formed by providing a vertical gap R between the upper end 23a of the outer shell 23 and the flange portion 24a, at least partially along the circumference. In other words, the flange portion 24a of this embodiment functions as a drawer by providing the gap R between it and the outer shell 23.

[0081] More specifically, in the double container 1 of this embodiment, the gap R is formed by providing recesses 24c in a portion of the circumferential portion of the lower surface 24b of the flange 24a. The recesses 24c are preferably provided at two locations circumferentially opposed to each other. However, the shape and number of the recesses 24c can be arbitrarily designed, as long as the flange 24a can be grasped with the fingers and the inner bag 24 can be easily pulled out.

[0082] The double container 1 of this embodiment forms a gap R, so that the flange portion 24a of the inner bag 24 can be easily grasped when separating the double container 1. Figure 11 As shown, the inner bag 24 can be easily pulled out from the outer shell 23.

[0083] Even with this structure, a pull-out portion for pulling the inner bag 24 out of the outer shell 23 can be formed on the flange portion 24a, thereby making it easy to disassemble and discard the double container 1. In other words, the method for disassembling the double container 1 in this embodiment can be said to include the steps of grasping the flange portion 24a having the recessed portion 24c and pulling the flange portion 24a from the upper end 23a of the outer shell 23 to separate the inner bag 24 and the outer shell 23.

[0084] It should be noted that a cover 3 having a protrusion that fits into the recess 24c is installed on the container body 2 having the structure of the inner bag 24 of this embodiment. As in the first embodiment, it can be made into a structure in which the inner bag 24 can be pulled out by removing the cover 3.

[0085] 4. Other variations

[0086] In the above embodiment, the double container 1 is of a squeeze type, configured so that the contents can be discharged by compressing the outer shell 23 when the mouth 22 is tilted downward. However, the double container 1 can also be configured as a pump type, in which a pump is installed at the mouth 22, and the pump suctions the contents through a tube inserted into the inner bag 24 and discharges them. In a pump-type double container 1, the external air inlet hole 25 and valve member 26 are not provided. It is preferred that the bottom of the housing 21 be open, and external air be introduced from the bottom.

[0087] The double container 1 in the above-described 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 can also have an inner bag 24 that does not shrink during use. In this case, the inner bag 24 is constructed so that it does not peel off and is not adhered to the outer shell 23, allowing it to be easily separated from the outer shell 23. Even with this double container 1 in which the inner bag 24 does not peel off during use, the inner bag 24 must be removed after use and disposed of separately from the outer shell 23. With this construction, it can be used as a PET container for condiments and sauces, which are generally not suitable for recycling. In other words, the inner bag 24 can be made of a material with excellent oxygen barrier properties, and the inner bag 24 can be removed after use, resulting in a PET outer shell 23 free of contents and capable of being recycled.

[0088] (Explanation of Symbols)

[0089] 1: Double container, 2: Container body, 3: Lid, 4: Spacer, 21: Accommodation portion, 21a: Recessed portion, 22: Mouth portion, 22a: External thread portion, 23: Outer shell, 23X: Outer shell preform, 23a: Upper end, 24: Inner bag, 24X: Inner bag preform, 24a: Flange portion, 24a1: Protrusion (pull-out portion), 24b: Lower surface, 24c: Recessed portion, 25: External air inlet hole, 26: Valve member, 31: Cover body, 32: Hinge, 33: Cover, 34: Main cover component, 34a: Outer cylinder (cylindrical portion), 34b: Inner cylinder, 34c: Annular portion, 34D: Internal threaded portion, 34E: Valve seat, 34f: Engaging claw (holding portion), 35: Check valve, 35a: Valve body, 35b: Elastic sheet, 35c: Annular support portion, 36: Discharge component, 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, wherein: The mouth of the container body is composed of the outer shell and the inner bag laminated together. The inner bag is provided with a pull-out portion at the mouth portion, which is located above the upper end of the outer shell, for pulling the inner bag out from the outer shell. At the mouth, the upper end of the inner bag is formed with a flange portion that covers the upper end of the outer shell from above. The pull-out portion is formed by providing a gap in the vertical direction between the upper end of the outer shell and the flange portion and in the circumferential direction. The double container includes a spacer arranged between the flange portion and the upper end of the outer shell, and the gap is formed by removing the spacer. The spacer is formed along the entire circumference and is configured to be detachable by being divided into two or more pieces.

2. The double container according to claim 1, wherein: The container body is formed by biaxial stretch blow molding by combining an outer shell preform forming the outer shell and an inner bag preform forming the inner bag into a double structure.

3. The double container according to claim 2, wherein: The outer shell preform is an injection-molded preform, and the inner bag preform is a tubular formed body formed by blow molding.

4. The double container according to claim 1, wherein: The inner bag is configured to shrink as the content decreases.

5. The double container according to claim 1, wherein: The double container is a squeezable container configured so that the contents are discharged by compressing the outer shell.

6. A method for disassembling a double container, wherein the double container is the double container according to claim 1, the method comprising: The step of gripping the pull-out portion and pulling it up from the upper end of the outer shell to separate the inner bag from the outer shell.

Images