Delaminated container

Abstract

To make it possible to easily separate an outer shell from an inner bag of a delamination container.SOLUTION: A delamination container 100 includes an outer shell 10 and an inner bag 10 arranged and laminated on the inner side of the outer shell, thereby the inner bag detaches from the outer shell and shrinks as the contents decrease. The outer shell includes an outside air inlet slit 16 on a bottom portion, and when the contents decrease, from the outside air inlet slit, the outer shell is torn off to make the outer shell at least partially separable from the inner bag.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] A known container for storing personal care products, food, etc. is a peelable laminated container (also referred to as a "double container") that has an outer shell and an inner bag that is housed inside the outer shell and can be freely compressed and deformed, and in which the inner bag can be peeled off from the outer shell by allowing outside air to be introduced between the outer shell and the inner bag.

[0003] When using such a delaminating container, when the outer shell is pressed to dispense the contents, only the inner bag reduces in volume according to the dispensed volume, and air is not drawn into the inner bag. This prevents direct contact between the unused contents remaining in the inner bag and air, and prevents oxidation and deterioration of the contents.

[0004] In recent years, separate collection of waste has been practiced to facilitate intermediate treatment (recycling, etc.) and final disposal, and depending on the contents contained in the inner bag, it may be desirable to separate the inner bag with the contents attached from the outer shell. Also, in order to improve the ease of use of the contents contained in the inner bag, it may be desirable to be able to remove the inner bag from the outer shell and squeeze the removed inner bag directly to further dispense the contents.

[0005] However, in conventional delaminating containers, it is difficult to remove the inner bag from the outer shell, and there is room for improvement.

[0006] In response to such problems, Patent Documents 1 to 3 provide delaminating containers in which the inner bag can be removed from inside the outer shell.

[0007] Specifically, Patent Document 1 provides a peelable laminated container comprising: a container body including an inner container (inner bag) that accommodates contents and undergoes volume reduction as the contents decrease; an outer container (outer shell) in which the inner container is housed; and a discharge cap that is removably attached to the mouth of the container body and has a discharge hole for the contents, the inner container and the discharge cap being fixed together. Patent Document 1 describes a configuration in which the inner container and the discharge cap are fixed together. Because the inner container and the discharge cap are fixed together, after the contents are discharged, the discharge cap can be removed from the mouth of the container body to pull out the reduced-volume inner container from the outer container. Therefore, the inner container can be removed more easily than in the past, and the outer container and the inner container can be easily separated, for example, according to the type of contents.

[0008] Patent Document 2 also provides a method for manufacturing a double container comprising a container body including an inner container (inner bag) that is filled with contents and undergoes volumetric deformation as the contents decrease, and an outer container (outer shell) in which the inner container is fitted, and a discharge cap that is detachably attached to the mouth of the container body and has a discharge hole for the contents, wherein the mouth of the container body is formed by stacking the mouth of the inner container and the mouth of the outer container, and the upper end of the mouth of the inner container is formed with a folded part that closes the open end of the mouth of the outer container from above, and the discharge cap is detachably attached to the mouth of the outer container and has a main body part that has a discharge hole, and an inner stopper part that has a communication hole that connects the inside of the inner container with the discharge hole and has a base part that is located above the upper opening of the mouth of the container body and is connected integrally with the main body part, and the method is characterized in that after a step of combining the discharge cap with the mouth of the container body in which the contents are fitted, a step of fixing the folded part of the inner container and the base part of the discharge cap together by high-frequency bonding is carried out. According to Patent Document 2, with this method, the inner container and the discharge cap are fixed together, so that after the contents are discharged, the discharge cap can be removed from the opening of the container body, and the deformed inner container can be removed by pulling it out from inside the outer container. Therefore, compared to conventional methods, the inner container can be removed more easily, and the outer container and the inner container can be easily separated according to the type of contents, for example.

[0009] Patent Document 3 also provides a delaminating container that is made up of an outer layer container (outer shell) that is exposed to the outside air and has an air inlet, and an inner layer container (inner bag) that is peelably laminated to the outer layer, and in which air is circulated between the outer layer and the inner layer from the air inlet, and the contents in the inner layer container are discharged by peeling and shrinking the inner layer container from the outer layer container, and the inner layer container can be disposed of separated from the outer layer container. Here, Patent Document 3 describes that the outer layer container has a separation tab, and that the inner layer container can be separated from the outer layer container by using this separation tab to tear off the outer layer container.

[0010] It should be noted that a delaminating container having an air inlet in the form of a slit at the bottom of the outer shell is known.

[0011] For example, Patent Document 4 provides a double container (delaminated container) made of synthetic resin having a bottle-shaped outer layer (outer shell) with a mouth, a body, and a bottom, an inner layer (inner bag) that has a storage space for the contents and is housed in the outer layer and can be freely reduced in volume, and an outside air inlet provided in the outer layer for introducing outside air between the outer layer and the inner layer, characterized in that a slit-shaped outside air inlet is provided in the bottom, and an air vent is provided in a part of the outer layer other than the bottom, connecting the outer layer and the inner layer to the outside of the outer layer. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-163520 [Patent Document 2] Japanese Patent Application Publication No. 2018-138477 [Patent Document 3] Japanese Patent Application Laid-Open No. 2015-212155 [Patent Document 4] Japanese Patent Publication No. 2020-23352 Summary of the Invention [Problem to be solved by the invention]

[0013] The present invention provides a novel delaminating container that allows the inner bag to be removed from within the outer shell. [Means for solving the problem]

[0014] The present inventors have conducted extensive research to solve the above problems and have completed the present invention as described below.

[0015] <Aspect 1> A delaminating container comprising an outer shell and an inner bag laminated and disposed inside the outer shell, whereby the inner bag peels off from the outer shell and shrinks as the contents decrease, The outer shell has an outside air inlet slit at the bottom, and When the content is reduced, the outer shell can be torn and at least partially separated from the inner bag using the outside air introduction slit as a trigger. Delaminated container. <Aspect 2> The delaminating container is a blow-molded delaminating container, The blow-molded delaminating container has a container parting line on the bottom surface, A part of the container parting line constitutes the outside air introduction slit, and Another part of the container parting line constitutes an inner bag engaging portion that engages the inner bag with the outer shell. 2. The delaminating container of embodiment 1. <Aspect 3> 3. The delaminating container according to claim 1 or 2, wherein the outer shell has a layer made of a mixed material of a synthetic resin and a biomass material. <Aspect 4> A delaminating container according to aspect 3, wherein in the layer of the outer shell, the proportion of the biomass material relative to the total of the synthetic resin and the biomass material is 20 mass % or more. <Aspect 5> 5. The delaminated container of claim 4, wherein the biomass material is rice flour. <Aspect 6> 3. The delaminating container according to claim 1, further comprising a mark indicating that the outer shell can be torn using the outside air inlet slit as a trigger. <Aspect 7> 3. The delaminating container of claim 1 or 2, wherein the delaminating container is for containing contents selected from the group consisting of personal care products, food products, and industrial materials. <Aspect 8> A delaminating container according to aspect 1 or 2, and Contents contained in the inner bag of the delaminating container; A delaminating container containing an article, comprising: [Effects of the Invention]

[0016] According to the delaminating container of the present invention, the inner bag can be easily removed from inside the outer shell. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1(a) is a schematic cross-sectional view of the delaminating container of the present invention, and FIG. 1(b) is a schematic bottom view of the delaminating container of the present invention. [Figure 2] 1 shows a blow molded delaminating container according to one embodiment of the present invention. [Figure 3] 1 is a cross-sectional photograph of the bottom surface of a blow-molded delaminating container according to one embodiment of the present invention. [Figure 4] 1 is a schematic diagram of a split mold for producing a blow molded delaminating container according to one embodiment of the present invention. [Figure 5] 1 is a schematic diagram showing a manufacturing process of a blow-molded delaminating container according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] <<Delaminable container>> The delaminating container of the present invention comprises an outer shell and an inner bag laminated inside the outer shell, whereby the inner bag peels off from the outer shell and shrinks as the contents decrease. Furthermore, in the delaminating container of the present invention, the outer shell has an outside air introduction slit (external air introduction hole) at the bottom, and when the contents decrease, the outside air introduction slit can be used as a trigger to tear the outer shell, particularly by tearing the outer shell by hand, so that the outer shell can be at least partially separated from the inner bag.

[0019] According to the peelable laminate container of the present invention, the inner bag can be easily removed from inside the outer shell. Therefore, the peelable laminate container of the present invention can have a marking indicating that the outer shell can be torn using the air inlet slit as a trigger, particularly a marking indicating that the outer shell can be torn by hand, thereby informing the user that the outer shell can be torn using the air inlet slit as a trigger. Such a marking can be printed directly on the outer shell, printed on a label sticker attached to the outer shell, and / or printed on a label wrapped around the outer shell.

[0020] Furthermore, according to the delaminating container of the present invention, the outside air inlet slit can be used as a trigger for tearing the outer shell, so there is no need to provide the outer shell with any other tearing structure other than the outside air inlet slit, such as perforations, linear thin-walled portions, or shell tearing tabs.

[0021] In a delaminating container, the outer shell is pressed and deformed, which presses the inner bag through the air inside the shell, and after the contents are discharged, the outer shell must return to its original shape. Therefore, since the outer shell of a delaminating container has a relatively large thickness and uses a relatively large amount of resin, it is very preferable that the outer shell can be separately collected and recycled. Note that the delaminating container of the present invention may be any delaminating container, particularly a blow-molded delaminating container.

[0022] Furthermore, as described above, the outer shell of the delaminating container has a relatively large thickness, making it difficult to squeeze out the contents remaining in the inner bag and use them to the last drop. In contrast, if the outer shell and inner bag could be easily separated, it would be possible to remove the inner bag from the outer shell and squeeze out the contents remaining in the inner bag to the last drop. Therefore, making it possible to easily separate the outer shell and inner bag is also desirable for reducing food waste.

[0023] The delaminating container of the present invention will be described below with reference to the drawings.

[0024] 1(a), the delaminating container 100 of the present invention comprises an outer shell 10 and an inner bag 20 laminated inside the outer shell 10, whereby the inner bag 20 peels off from the outer shell 10 and shrinks as the contents decrease. The delaminating container 100 of the present invention has a discharge cap 30 at its opening.

[0025] 1(b), the bottom of the outer shell of the delaminating container of the present invention has an outside air introduction slit (outside air introduction hole) 16 that allows outside air to be introduced between the outer shell and the inner bag while preventing outside air from leaking from the outer shell when the container is pressed. The bottom also has a circular outer peripheral edge 12 and a recess 14 that is provided inside the outer peripheral edge 12 and recessed upward (toward the mouth of the container), and by grounding the outer peripheral edge 12, the delaminating container 100 can be placed in an upright position. The outside air introduction slit 16 is preferably located in the recess 14.

[0026] For example, if the peelable laminated container 100 is a blow-molded peelable laminated container, the laminated parison is bitten off by a mold when the peelable laminated container 100 is formed by blow molding, thereby forming a pinch-off portion extending along the parting line of the mold at the bottom of the outer shell 10, and the joint between the outer shell 10 and the inner bag 20 at this pinch-off portion may form a slit-shaped outside air inlet (outside air inlet hole) 16.

[0027] In addition, in delaminating containers, the outer shell and inner bag may be partially bonded and / or interlocked to each other to prevent the inner bag from rolling up inside the outer shell and making it difficult to squeeze the contents out of the inner bag. In such cases, it is necessary to weaken the bond and / or interlock between the outer shell and inner bag to an extent that the outer shell can be separated from the inner bag. The degree of bond and / or interlock between the outer shell and inner bag can be adjusted by adjusting the type and amount of adhesive used to bond the outer shell and inner bag together, or by adjusting the degree of interlocking to secure the outer shell and inner bag together.

[0028] In one embodiment of the delaminating container of the present invention, the container parting line can form both the outside air inlet slit and the inner bag locking part. That is, in one embodiment of the delaminating container of the present invention, the delaminating container is a blow-molded delaminating container having a container parting line on its bottom surface, a part of the container parting line forming the outside air inlet slit, and another part of the container parting line forming the inner bag locking part that locks the inner bag to the outer shell.

[0029] (Outer shell) The outer shell of the delaminating container of the present invention may be made up of a single layer or a laminate.

[0030] The outer shell can have an appropriate tear strength to enable tearing, particularly by hand. For example, the tear strength of the outer shell may be 30.0 N or less, 25.0 N or less, 20.0 N or less, 15.0 N or less, 10.0 N or less, 8.0 N or less, 7.0 N or less, 6.0 N or less, or 5.0 N or less. Furthermore, in order for the outer shell to have appropriate strength, this tear strength may be 1.0 N or more, 2.0 N or more, or 3.0 N or more. This tear strength can be evaluated by molding the resin constituting the outer shell into a sheet of a thickness corresponding to the outer shell using a heat press machine, and then performing a tear test on this sample in accordance with JIS K7128-2.

[0031] The synthetic resin constituting the outer shell can be appropriately selected depending on the application of the delaminating container, and for example, a synthetic resin having resilient flexibility can be used. Furthermore, when the outer shell is a laminate, the outer shell can have an adhesive layer or the like disposed between the layers to perform the role of adhesion.

[0032] Examples of synthetic resins that make up the shell include polyolefin resins such as low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene resin (MDPE), high-density polyethylene resin (HDPE), polypropylene resin (PP), and ethylene-propylene copolymer. These may be used alone or in blends of two or more. Furthermore, additives may be added to impart functionality, etc., as needed.

[0033] In addition, it may be preferable to mix a biomass material with the synthetic resin that makes up the shell to adjust the tear strength of the shell. Thus, for example, the shell can have a layer made of a mixed material of synthetic resin and biomass material, particularly a layer made of a mixed material of olefin resin and biomass material. In this case, in this layer of the shell, the proportion of the biomass material relative to the total of the synthetic resin and biomass material may be 20% by mass or more, 30% by mass or more, 40% by mass or more, or 50% by mass or more, and may be 60% by mass or less, 50% by mass or less, 40% by mass or less, 30% by mass or less, or 20% by mass or less.

[0034] Among these biomass materials, eggshell powder is an example of inorganic biomass materials, while rice flour and wood flour are examples of organic biomass materials. The use of such biomass materials is also preferable from an environmental perspective.

[0035] (Inner bag) The inner bag of the delaminating container of the present invention may be made of a single layer or a laminate, and generally, the inner bag is made of a laminate.

[0036] The synthetic resin constituting the inner bag can be appropriately selected depending on the application of the delaminating container, and for example, a synthetic resin having oxygen barrier properties can be used. Furthermore, when the inner bag is a laminate, the inner bag can have an adhesive layer or the like disposed between layers to perform the role of adhesion.

[0037] When the inner bag is constructed of a laminate, the inner bag may have a layer containing, for example, ethylene-vinyl alcohol copolymer (EVOH) in order to maintain barrier properties and further prevent oxidative deterioration of the contents filled in the inner bag.

[0038] EVOH has excellent oxygen barrier properties, so by using an EVOH layer for at least one of the layers constituting the inner bag, particularly the outermost layer of the inner bag, it is possible to block contact between the contents filled in the inner bag and oxygen, thereby suppressing oxidative deterioration of the contents.

[0039] Furthermore, since EVOH is a polar resin, if the innermost layer of the adjacent outer shell is made of a resin with low polarity or no polarity, the compatibility with the adjacent resin will be low during blow molding of the blow-molded delaminating container. Therefore, for example, if the innermost layer of the outer shell is made of a polyolefin-based resin or the like, the outermost layer of the inner bag will be an EVOH layer, which will improve the peelability between the outer shell and the inner bag.

[0040] Resins other than EVOH that can be used to make the inner bag include, for example, synthetic resins that can be blow-molded and designed to be thin so that they can be easily reduced in volume and deformed, and adhesives that are placed between layers to act as adhesives.

[0041] Examples of such synthetic resins include polyolefin resins such as low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene resin (MDPE), high-density polyethylene resin (HDPE), polypropylene resin (PP), and ethylene-propylene copolymer, as well as polyamide resins such as nylon. These may be used alone or in blends of two or more. Furthermore, additives for imparting functionality, etc., may be blended as needed.

[0042] In the inner bag, a resin having resistance to contents is preferably used as the innermost layer that forms the space for filling the contents. Examples of resins having resistance to contents include low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE).

[0043] The adhesive placed between the layers of the inner bag may be a resin capable of welding these layers together, such as a modified polyolefin resin.

[0044] (Contents) The delaminating container of the present invention may be for containing liquid, gel, or paste contents. Specifically, the delaminating container may be for containing contents selected from the group consisting of personal care products, food, and industrial materials. Here, the personal care products conceptually include medicines, quasi-drugs, cosmetics, and detergents.

[0045] Examples of pharmaceuticals and quasi-drugs include injections, drip infusions, infusions, perfusions, decoctions, and the like. Examples of cosmetics include shampoo, conditioner, hair styling products (e.g., hair water, hair liquid, grease, etc.), toothpaste, etc. Examples of detergents include neutral detergents, alkaline detergents, and acidic detergents. Examples of foods include beverages, cooking oils, soups, creams, liquid seasonings (e.g., soy sauce, vinegar, noodle soup, simmered stock, mirin, Worcestershire sauce, ketchup, Tabasco, sweeteners), gel or paste seasonings (e.g., wasabi, jelly, jam, miso), etc. Examples of industrial materials include coating materials (for example, paint, varnish, oil stain), adhesives, caulking materials, and building materials such as plaster.

[0046] <<Delaminated container with contents>> The content-containing delaminating container of the present invention includes the delaminating container of the present invention and the content contained in the inner bag of the delaminating container. For details of the delaminating container of the present invention and the content, etc., please refer to the above descriptions.

[0047] <<Specific Embodiments of the Delaminable Container>> Hereinafter, one specific embodiment of the delaminating container of the present invention in which the container parting line constitutes both the outside air introduction slit and the inner bag locking portion will be described with reference to FIGS.

[0048] The blow molded delaminating container 1 of this embodiment has a container parting line 4 on the bottom surface 3 of the container, which has a step portion 41 with a step and a flat portion 42 without a step.

[0049] At the step portion 41, on the inside of the container at the bottom surface 3 of the container, the material forming the outer shell 5 and inner bag 6 is molded asymmetrically on both sides of the container parting line 4, thereby engaging the inner bag 6 with the outer shell 5.

[0050] In the flat portion 42, on the inside of the container at the bottom surface 3 of the container, the material forming the outer shell 5 and inner bag 6 is molded symmetrically on both sides of the container parting line 4, so that the inner bag 6 is not engaged with the outer shell 5.This structure makes it possible to form an outside air inlet 16 that introduces outside air between the outer shell 5 and the inner bag 6.

[0051] The outside air inlet 16 is created by pulling the inner bag 6 out of the outer shell 5 at the flat portion 42. For example, the inner bag 6 can be pulled out of the outer shell 5 by a procedure called preliminary peeling, in which the inner bag 6 is peeled off from the outer shell 5 after production. By pulling out, a gap is created where the inner bag 6 was previously located, and this gap can be used as the outside air inlet 16.

[0052] The blow-molded peelable laminated container 1 of this embodiment may be, for example, a container in the state in which the outer shell 5 and inner bag 6 are not peeled off and are in contact as they are when produced by blow molding, or a container in a state in which an air inlet is formed by inserting air between the outer shell 5 and inner bag 6 after production, in order to make the inner bag 6 in a state in which it is easy to peel off from the outer shell 5 when used.

[0053] Fig. 2(a) is a perspective view of the blow-molded delaminating container 1 as viewed obliquely from the bottom surface 3, Fig. 2(b) is an enlarged view of the bottom surface 3 of the blow-molded delaminating container 1, and Fig. 2(c) is a photograph of the bottom surface 3 of the blow-molded delaminating container 1 taken from outside the container. The XX line and YY line in Fig. 2(b) correspond to the XX line and YY line in Fig. 2(c), respectively.

[0054] The blow-molded delaminating container 1 of this embodiment shown in Fig. 2(a) has a body 2 and a bottom surface 3. The bottom surface 3 has a container parting line 4, which is a line formed corresponding to a mold parting line formed by a split mold used in blow molding.

[0055] 2(a), the blow-molded delaminating container 1 of this embodiment has a stepped portion 41 with a step and a flat portion 42 without a step at the container parting line 4 on the bottom surface 3. The outer periphery of the bottom surface 3 serves as a setting portion that comes into contact with the ground or the like when the container is inverted.

[0056] The blow-molded delaminating container 1 of this embodiment shown in Figure 2(a) is immediately after production, and has a resin piece 43 attached to the bottom surface 3, which is connected to and protruding from the step portion 41. The resin piece 43 is a product burr formed by solidifying the resin that is the material of the blow-molded delaminating container 1, and can be removed from the bottom surface 3 of the blow-molded delaminating container 1 with a slight force.

[0057] Figure 2(b) is an enlarged view of the bottom surface 3 of the blow-molded delaminating container 1 of this embodiment shown in Figure 2(a), and clearly shows, in enlarged form, the stepped portion 41 having a step, the flat portion 42 having no step, the resin piece 43 connecting and protruding from the stepped portion 41, and the installation portion on the outer periphery of the bottom surface, which are included in the container parting line 4.

[0058] The XX line in Figure 2(b) is a line that indicates a direction perpendicular to the container parting line 4 in the step portion 41 having a step, and the YY line is a line that indicates a direction perpendicular to the container parting line 4 in the flat portion 42 without a step.

[0059] Figure 2(c) is a photograph of the bottom surface 3 of the blow-molded delaminating container 1 of this embodiment taken from outside the container. Note that the XX line and YY line in Figure 2(b) correspond to the XX line and YY line in Figure 2(b), respectively.

[0060] A cross-sectional photograph of the bottom surface of the blow-molded delaminating container of this embodiment is shown in Figure 3. Figures 3(a) and 3(b) are cross-sectional photographs of two different locations on the bottom surface 3 of the blow-molded delaminating container 1 shown in Figure 2.

[0061] Fig. 3(a) is a cross-sectional view of the XX line in Fig. 2(b) and Fig. 2(c), i.e., a cross-sectional photograph of the bottom surface 3 of the blow-molded delaminating container 1 of this embodiment, cut perpendicular to the container parting line 4 so as to pass through the step portion 41 on the bottom surface 3.

[0062] In this embodiment of the blow-molded delaminating container 1, at the step portion 41 of the container parting line 4 on the bottom surface 3, the material forming the outer shell 5 and inner bag 6 on the inside of the container on the bottom surface 3 of the blow-molded delaminating container 1 is molded asymmetrically on both sides of the container parting line 4, thereby creating a structure in which an engagement 7 between the inner bag 6 and the outer shell 5 is created.

[0063] Fig. 3(b) is a cross-sectional view taken along line YY in Fig. 2(b) and Fig. 2(c), i.e., a cross-sectional photograph of the bottom surface 3 of the blow-molded delaminating container 1 of this embodiment, cut perpendicular to the container parting line 4 so as to pass through the flat portion 42 of the bottom surface 3.

[0064] In this embodiment of the blow-molded delaminating container 1, at the flat portion 42 of the container parting line 4 on the bottom surface 3, the materials forming the outer shell 5 and inner bag 6 are molded symmetrically on both sides of the container parting line 4 on the inside of the container on the bottom surface 3 of the blow-molded delaminating container 1, so that the inner bag 6 is not engaged with the outer shell 5, and a sandwiching portion 8 of the inner bag 6 is created at the joint of the outer shell 5.

[0065] Then, by pulling out the inner bag 6 from the joint of the outer shell 5 at the clamping portion 8, a gap can be created where the inner bag 6 was located, and this gap becomes an air inlet for introducing outside air between the outer shell 5 and the inner bag 6.

[0066] In the production of this laminate blow-molded container, a molten multilayer parison in which the outermost to innermost layers are arranged in order is extrusion-molded, the molten multilayer parison is placed in a split mold for blow molding, the split mold is closed, and a blow nozzle is inserted into the opening that will become the mouth of the laminate blow-molded container body. With the mold closed, air is blown into the mold cavity of the split mold to form a blow-molded product in which the outermost to innermost layers are stacked. After molding, the split mold is opened and the blow-molded product is removed.

[0067] In this case, the split mold is a split mold consisting of at least two or more parts, and by closing these parts, a mold cavity for forming the laminated blown container of this embodiment is formed. For example, it may be a two-part mold, a four-part mold, etc.

[0068] The mold cavity thus formed has a misalignment at a part of the mold parting line on the bottom surface thereof due to the misalignment of the multiple mold halves that make up the split mold. Specifically, the misalignment occurs when a step exists between the mold halves when the split mold is closed to form the mold cavity, and this step forms a gap between the mold halves.

[0069] Furthermore, outside the mold cavity of the misaligned portion, a resin flow portion is provided to push the molten resin, which is the material for the laminated blow-molded container, from the outside to the inside of the mold cavity by the clamping pressure when closing the split mold.

[0070] In this split mold, due to the presence of this misalignment portion and resin flow portion, the molten resin pushed up from the outside to the inside of the mold cavity by the clamping pressure when closing the split mold is molded asymmetrically on both sides of the container parting line on the inside of the container bottom surface of the resulting laminated blow-molded container.

[0071] This allows the stacked layers to be engaged with each other on the inside of the container at the bottom of the container to be formed. For example, when a blow-molded delaminated container is formed, which has an outer shell and an inner bag stacked inside the outer shell, and the inner bag peels off from the outer shell and shrinks as the contents decrease, the inner bag can be engaged with the outer shell on the inside of the container at the bottom of the container.

[0072] The misalignment portion of the mold parting line on the cavity bottom surface can be formed, for example, by varying the size of the split mold at the position where the misalignment portion will occur.

[0073] The configuration of the resin flow portion located outside the mold cavity at the mismatched portion is not particularly limited. For example, a recess connected to the mismatched portion may be formed at a position outside the mold cavity so that a pool of molten resin connected to the mismatched portion can be formed. A pool of molten resin, which is the material for the laminate blow-molded container, is created in the recess, and the clamping pressure applied when closing the split mold allows the molten resin to be pushed up from the recess on the outside of the mold cavity to the inside of the cavity.

[0074] The position of the misalignment of the mold parting line on the cavity bottom is not particularly limited. For example, it may be approximately the center of the mold parting line. By locating the misalignment in the approximately center, an asymmetrically molded lock can be formed in the approximately center of the bottom of the formed container. For example, when a blow-molded delaminating container is molded, it becomes possible to cause the inner bag to shrink approximately uniformly during use.

[0075] Furthermore, in this split mold, the mold parting line on the bottom surface of the mold cavity formed by closing the split mold may have a matching portion other than the mismatched portion.

[0076] Because the matching portion is flat and has no steps or gaps at the mold parting line, the material forming the container is molded symmetrically on both sides of the container parting line on the inside of the bottom of the resulting laminated blow-molded container, so that the stacked layers do not lock together on the inside of the bottom of the resulting container.

[0077] When the blow-molded delaminating container of this embodiment is produced using this split mold, an air inlet for introducing outside air between the outer shell and the inner bag can be formed by pulling the inner bag out of the outer shell at the flat portion formed by the alignment portion. One method for pulling the inner bag out of the outer shell is, for example, pre-peeling, which is carried out after producing the blow-molded delaminating container and before using the container.

[0078] The position of the alignment portion of the mold parting line on the cavity bottom surface is not particularly limited. For example, when a misalignment portion is provided approximately in the center of the mold parting line, alignment portions may be provided on both sides of the misalignment portion.

[0079] An example of this split mold is shown in Figure 4. The split mold shown in Figure 4 is composed of two parts, part A and part B, and by closing part A and part B, one mold cavity is formed.

[0080] Figure 4(a) shows partial mold A, Figure 4(c) shows partial mold B, and Figure 4(b) is a cross-sectional view of the center of the mold cavity formed by closing partial mold A and partial mold B, taken along a line that intersects partial mold A and partial mold B. In other words, a mold cavity is formed by rotating partial mold A in Figure 4(a) and partial mold B in Figure 4(c) by 90 degrees and closing them, and Figure 4(b) is a cross-sectional view of the center of the mold cavity that is formed.

[0081] The split mold part A shown in Fig. 4(a) has a mismatching portion C11 that forms a mismatch at the mold parting line on the bottom surface of the mold cavity when the split mold part A is closed with the split mold part B shown in Fig. 4(c) to form a mold cavity. In the split mold shown in Fig. 4(a), the mismatching portion C11 is located approximately in the center of the mold parting line.

[0082] Moreover, in the partial mold A of the split mold shown in FIG. 4(a), a resin flow portion D1 is provided outside the mold cavity connected to the mismatching portion C11.

[0083] Furthermore, partial mold A of the split mold shown in Fig. 4(a) has, when closed with partial mold B shown in Fig. 4(c) to form a mold cavity, matching portions C21 that match with partial mold B at the mold parting line on the bottom surface of the mold cavity. Matching portions C21 exist on both sides of mismatching portions C11 at the mold parting line.

[0084] Partial mold B of the split mold shown in Figure 4(c) has a misalignment portion C12 that forms a misalignment at the mold parting line on the bottom surface of the mold cavity when it is closed with partial mold A shown in Figure 4(a) to form a mold cavity.

[0085] Moreover, the mold section B of the split mold shown in FIG. 4(c) is provided with a resin flow section D2 outside the mold cavity connected to the mismatch section C12.

[0086] Furthermore, partial mold B of the split mold shown in Fig. 4(c) has, when closed with partial mold A shown in Fig. 4(a) to form a mold cavity, matching portions C22 that match with partial mold A at the mold parting line on the bottom surface of the mold cavity. Matching portions C22 are present on both sides of mismatching portions C12 at the mold parting line.

[0087] In the split mold shown in Figure 4, a mold cavity is formed by rotating partial mold A in Figure 4(a) and partial mold B in Figure 4(c) by 90 degrees and closing them. As shown in Figure 4(b), which is a cross-sectional view of the center of the formed mold cavity, the mold parting line at the bottom of the mold cavity formed by partial mold A and partial mold B has a step due to the difference in height between misalignment portion C11 of partial mold A and misalignment portion C12 of partial mold B. This step results in the formation of a gap between partial mold A and partial mold B.

[0088] In addition, the resin flow portion D1 connected to the misalignment portion C11 of the partial mold A and the resin flow portion D2 connected to the misalignment portion C12 of the partial mold B are recesses provided on the outside of the mold cavity, and when manufacturing the laminated blow-molded container of this embodiment, the material, the multilayer molten parison, is inserted into these recesses.

[0089] In the resin flow section D1 of the partial mold A and the resin flow section D2 of the partial mold B, the clamping pressure applied when closing the partial molds A and B causes the multilayer molten parison, which is the material for the laminated blow-molded container, to move from the resin flow section D1 and the resin flow section D2, i.e., from the outside of the mold cavity, pushing it up into the mold cavity.

[0090] The multilayer molten resin is forced up from the outside to the inside of the mold cavity by the clamping pressure when closing mold halves A and B, and is molded asymmetrically on both sides of the container parting line formed by mismatching portions C11 and C12 on the inside of the bottom of the resulting laminate blow-molded container. As a result, the resin layers that made up the multilayer molten parison are locked together on the inside of the bottom of the resulting laminate blow-molded container.

[0091] The method for manufacturing a laminated blow-molded container of this embodiment involves placing a multilayer parison having a cylindrical outer layer and an inner layer between split molds, and then closing the split molds to form a mold cavity, which is formed by crushing the multilayer parison at the bottom to form a pinch-off portion.

[0092] Then, a step portion having a step is formed in a part of the pinch-off portion to be formed, and a flat portion without a step is formed in the remaining part of the pinch-off portion.

[0093] In the step portion, when the split mold is closed, the molten resin that constitutes the multilayer parison is pushed up from the outside to the inside of the mold cavity, molding the molten resin asymmetrically on both sides of the mold parting line inside the mold cavity, thereby locking the inner layer against the outer layer.

[0094] The position of the step is not particularly limited. For example, it may be formed so as to be located approximately in the center of the pinch-off portion. By locating the step in the approximately central portion, an asymmetrically molded lock can be formed approximately in the center of the bottom surface of the laminate blow-molded container to be molded. For example, when a blow-molded delaminating container is molded, it becomes possible to cause the inner bag to shrink approximately uniformly during use.

[0095] The method for forming the step portion is not particularly limited. For example, the step portion can be formed by using a mold cavity used for molding that has a height difference at the mold parting line at the bottom of the cavity.

[0096] An example of a mold in which the mold parting line at the bottom of the mold cavity has a height difference is the split mold of the present invention described above. That is, a misalignment caused by misalignment of the multiple mold halves that make up the split mold is formed in part of the mold parting line at the bottom of the mold cavity formed by closing the split mold, thereby forming a step between the mold halves. This step then forms a gap between the mold halves.

[0097] The method for pushing up the molten resin at the step portion is not particularly limited. For example, a split mold having a resin flow portion provided outside the mold cavity at the mold parting line corresponding to the step portion may be used, and the molten resin constituting the multilayer parison, which is the material, may be pushed up and moved from the resin flow portion to the inside of the mold cavity by the clamping pressure when closing the split mold.

[0098] An example of such a resin flow portion is the configuration of the split mold of the present invention described above.

[0099] The flat, stepless section formed in the remaining pinch-off section allows the molten resin that makes up the multilayer parison to be molded symmetrically on both sides of the mold parting line inside the mold cavity, thereby creating a flat section where the inner layer is not anchored to the outer layer.

[0100] The method for forming the flat portion is not particularly limited. In general, the flat portion can be formed by using a mold cavity used for molding in which the mold parting line at the bottom of the cavity is aligned without providing a difference in height.

[0101] The flat portion is molded without any steps or gaps at the mold parting line at the bottom of the cavity, so the molten resin is molded symmetrically on both sides of the mold parting line inside the mold cavity, and as a result, the inner layer is not anchored to the outer layer.

[0102] The position of the flat portion is not particularly limited. For example, when a step portion is provided at approximately the center of the pinch-off portion, flat portions may be provided on both sides of the step portion.

[0103] The method for manufacturing a laminate blow-molded container of the present invention can also be used to produce a blow-molded delaminating container. That is, a container can be formed that includes an outer shell and an inner bag laminated inside the outer shell, and in which the inner bag peels off from the outer shell and shrinks as the contents decrease.

[0104] When a blow-molded delaminating container is produced by the method of the present invention for producing a laminate blow-molded container, an outer shell is formed from a multilayer parison having a cylindrical outer layer and an inner layer, and an inner bag is formed from the inner layer. The inner bag is then locked to the outer shell by a lock formed in a step portion of the pinch-off portion.

[0105] Furthermore, in the flat portion of the pinch-off portion, by pulling out the inner bag from the outer shell after producing the blow-molded delaminating container, an outside air inlet for introducing outside air between the outer shell and the inner bag can be produced. One method for pulling out the inner bag from the outer shell is, for example, pre-peeling, which is carried out after producing the blow-molded delaminating container and before using the container.

[0106] A method for producing a laminate blow-molded container of this embodiment is shown in Fig. 5. Fig. 5 shows the steps for producing a laminate blow-molded container using the split mold shown in Fig. 4.

[0107] In manufacturing the laminate blow-molded container of this embodiment, first, as shown in Figure 5(a), a molten multilayer parison 9, in which the outermost to innermost layers are arranged in order, is placed between partial molds A and B of a split mold. Partial mold A of the split mold has a mismatching portion C11, and partial mold B has a mismatching portion C12, and when partial molds A and B are closed to form a mold cavity, a step is created in the mold cavity due to mismatching portions C11 and C12.

[0108] Next, as shown in Figure 5(b), when partial mold A and partial mold B begin to close, the molten multilayer parison 9 is pinched off by the misalignment portion C11 of partial mold A and the misalignment portion C12 of partial mold B, and the multilayer parison outside the mold cavity moves so as to be fitted into the respective recesses of the resin flow portion D1 (not shown) connected to the misalignment portion C11 of partial mold A and the resin flow portion D2 (not shown) connected to the misalignment portion C12 of partial mold B.

[0109] Furthermore, when partial mold A and partial mold B are closed to form the mold cavity, the state shown in Figure 5(c) is reached. The clamping pressure (indicated by the arrows in the figure) applied when partial mold A and partial mold B are closed moves the molten resin that makes up parison 9 from resin flow portion D1 of partial mold A and resin flow portion D2 of partial mold B to the inside of the formed mold cavity. The moved molten resin then creates engagement 7 in the step formed by misalignment portion C11 of partial mold A and misalignment portion C12 of partial mold B.

[0110] Thereafter, a blow nozzle is inserted into the opening that will become the mouth of the laminate blow-molded container body of this embodiment, and air is blown into the mold cavity to mold a laminate blow-molded container in which the outer layer and inner layer are laminated. After molding, the mold halves A and B of the split mold are opened, and the laminate blow-molded container is removed. [Example]

[0111] <Delaminating container> In the following examples and comparative examples, blow-molded delaminating containers were used, each having an outer shell and an inner bag with the following laminated structure from the outside to the inside of the container: The "blend of polyethylene (PE) and rice flour" used in the outer shell was obtained from a masterbatch containing polyethylene (PE) and rice flour in polyethylene (PE). (Outer shell) Polyethylene (PE) and rice flour blend (thickness: approx. 900 μm) / cyclic olefin copolymer (COC) (thickness: approx. 60 μm) (Inner bag) Ethylene-vinyl alcohol copolymer (EVOH) (thickness: approx. 35 μm) / polyolefin adhesive layer (thickness: approx. 25 μm) / polyethylene (PE) (thickness: approx. 150 μm)

[0112] Examples 1 to 6 and Comparative Examples 1 and 2 As shown in Table 1 below, blow-molded delaminating containers of Examples 1 to 6 and Comparative Examples 1 and 2 were produced by varying the ratio of rice flour to the total of polyethylene and rice flour in the outer layer of the outer shell. In producing these blow-molded delaminating containers, as shown in Figures 2 to 6, the blow-molded delaminating container had a container parting line on the bottom, one part of the container parting line formed an outside air introduction slit, and another part of the container parting line formed an inner bag locking part that locks the inner bag to the outer shell.

[0113] To evaluate tear strength, a resin mixture of polyethylene and rice flour was molded into a sheet approximately 900 μm thick using a heat press, and the tear strength of one sheet of this sample was evaluated in accordance with JIS K 7128-2. Note that the tear strength was evaluated without laminating the cyclic olefin copolymer (COC) layer, one of the resin layers that make up the outer shell. However, since the COC layer accounts for less than 10% of the shell thickness and is not a major factor in determining tear strength, this is considered to pose no substantial problem in evaluating the experimental results.

[0114] In addition, the MFR of the resin containing polyethylene and rice flour was evaluated in accordance with JIS K 7210-1:2014.

[0115] The results are shown in Table 1 below. In Table 1, "tearability" was rated as ◯ if the outer shell of the blow-molded delaminating container could be torn by hand using the outside air inlet slit as a trigger, and × if tearing by hand was difficult. Also, "blow moldability" was rated as ◯ if the delaminating container could be molded by blow molding, and × if it could not be molded.

[0116] [Table 1]

[0117] As shown in Table 1, the blow-molded delaminating containers of Examples 1 to 4 were rated "good" for both "tearability" and "blow moldability," whereas the blow-molded delaminating container of Comparative Example 1 was rated "poor" for "blow moldability," and the blow-molded delaminating container of Comparative Example 2 was rated "poor" for "tearability." [Explanation of symbols]

[0118] 1. Blow-molded delaminating container 2. Torso 3 Bottom 4 Container parting line 5, 10 outer shell 6, 20 inner bag 7 Locking part 8 Clamping part 9 Multi-layer parison 12 Outer edge 14 Recess 16. Outside air intake 30 Discharge cap 41 Step 42 Flat area 43 Resin piece 100 delaminating container A, B, E, F partial type C11, C12 mismatched part C21, C22 matching part D1, D2 Resin flow section

Claims

1. A delaminating container comprising an outer shell and an inner bag laminated and disposed inside the outer shell, whereby the inner bag peels off from the outer shell and shrinks as the contents decrease, The outer shell has an outside air inlet slit at the bottom, and When the content is reduced, the outer shell can be torn and at least partially separated from the inner bag using the outside air introduction slit as a trigger. Delaminated container.

2. The delaminating container is a blow-molded delaminating container, The blow-molded delaminating container has a container parting line on the bottom surface, A part of the container parting line constitutes the outside air introduction slit, and Another part of the container parting line constitutes an inner bag engaging portion that engages the inner bag with the outer shell. The delaminating container according to claim 1.

3. The delaminating container according to claim 1 or 2, wherein the outer shell has a layer made of a mixed material of a synthetic resin and a biomass material.

4. The delaminating container according to claim 3 , wherein in the layer of the outer shell, a ratio of the biomass material to a total of the synthetic resin and the biomass material is 20 mass % or more.

5. The delaminating container of claim 4, wherein the biomass material is rice flour.

6. 3. The delaminating container according to claim 1, further comprising a mark indicating that the outer shell can be torn using the air inlet slit as a trigger.

7. 3. The delaminating container of claim 1 or 2, wherein the delaminating container is for containing contents selected from the group consisting of personal care products, food products, and industrial materials.

8. The delaminating container according to claim 1 or 2, and Contents contained in the inner bag of the delaminating container; A delaminating container containing an article, comprising:

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