Double-layer container

Abstract

Provided is a double-layer container capable of achieving a feeling of use that is not inferior to when a valve member is provided in an air introduction hole, reducing the number of components, and reducing manufacturing costs. The double-layer container has an outer layer and an inner layer, and the inner layer shrinks as the content contained in the inner layer decreases. The double-layer container is provided with a body part and a mouth part, the outer dimension of the mouth part is smaller than that of the body part, the mouth part is provided with a discharge port, and an air introduction hole without a valve is formed in the outer layer of the mouth part. The double-layer container is configured in such a manner that the contents can be discharged by pressing the trunk part by pouring the container with the mouth part facing downward. When the contents are discharged, the inner layer is closely attached to the air introduction hole and is in a sealed state, and the contents are smoothly discharged by pressing. The air introduction hole is formed in the neck portion at a base end side of the mouth portion.

Description

[0001] This application is a divisional application of the original application filed on February 14, 2022 (priority date February 19, 2021), with application number 202210132898.2 and invention title "Double-layer container and method of manufacturing thereof". Technical Field

[0002] This invention relates to double-walled containers. Background Technology

[0003] (First viewpoint) A double-layered container has been proposed, comprising an outer container and an inner bag, wherein the inner bag shrinks as the contents decrease (a so-called stacked peel container) (see, for example, Patent Document 1, Patent Document 2, etc.). In this double-layered container, because the inner bag shrinks as the contents decrease, air does not enter the inner bag, minimizing contact between the contents and air, thereby inhibiting oxidation and deterioration.

[0004] In the double-layered container, since air needs to be introduced between the outer container and the inner bag, an air inlet hole is typically formed in the outer container, and a valve component is installed in the air inlet hole to adjust the airflow. In the laminated peeling containers of Patent Documents 1 and 2, a recess is formed in the shoulder of the container, where an air inlet hole, which penetrates only the outer shell (outer container), is passed through, and a valve component is installed. The valve component is installed in the air inlet hole formed in the outer shell of the container body, and the air inlet hole is opened and closed by moving the valve component relative to the container body.

[0005] (Second viewpoint) Patent document 3 discloses the following configuration: a groove is provided on the container body of the double-layer container, opening to the side of the container body, an external air inlet is provided in the groove, and a valve component for controlling the airflow through the external air inlet is installed in the groove.

[0006] (Third viewpoint) Patent document 4 discloses the following technology: a protrusion is provided on the container molding body that becomes the container body, and a cutting tool is used to partially remove the outer shell from the protrusion, thereby forming an external air inlet hole in the outer shell.

[0007] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2017-154802 Patent Document 2: Japanese Patent Application Publication No. 2017-193342 Patent Document 3: Chinese Utility Model Announcement No. 212474572 Specification Patent Document 4: Description of Chinese Patent Application Publication No. 110480984 Summary of the Invention

[0008] (The problem that the invention aims to solve) (First viewpoint) The aforementioned double-layered container can suppress the contact between the contents and air, minimizing the effects of oxidation, etc. However, the double-layered structure consists of three parts: the container body, the external air inlet valve, and the cap. The large number of parts increases the cost compared to ordinary plastic containers, which has become a major challenge.

[0009] The present invention was made in view of the following circumstances, and its object is to provide a double-walled container that can ensure sufficient performance while reducing the number of parts and lowering manufacturing costs.

[0010] (Second viewpoint) In the configuration of Patent Document 3, the valve components inside the groove are prone to misalignment.

[0011] The present invention was made in view of the following circumstances, and its object is to provide a double-walled container capable of preventing misalignment of valve components installed in the container body of a double-walled container.

[0012] (Third viewpoint) In the configuration of Patent Document 4, when the cutting tool comes into contact with the protrusion, the cutting tool slides towards the top of the protrusion, making it impossible to form the external air inlet hole with high precision. In addition, when it is possible to cut the outer shell at a position other than the root of the protrusion, it is difficult to identify the cutting position, so it is impossible to form the external air inlet hole with high precision.

[0013] The present invention was made in view of the following circumstances, and its object is to provide a method for manufacturing a double-layer container that can form an external air inlet hole in the container body with high precision.

[0014] (Technical solutions used to address the problem) (First viewpoint) To achieve the above objectives, the double-layered container of the present invention has an outer layer and an inner layer, which shrinks as the contents contained in the inner layer decrease. It is characterized by having a body and a mouth, the mouth being smaller in size than the body and having an outlet. In the mouth, an air inlet without a valve is formed on the outer layer.

[0015] Through in-depth research, the inventors discovered that in a double-layered container where the contents are discharged downwards, the position of the air inlet hole affects the user experience. Further repeated research revealed that by forming the air inlet hole at the opening, particularly near the base (the so-called neck), a user experience comparable to that with a valve component can be achieved.

[0016] The double-layered container of the present invention is proposed based on the above-mentioned insights. Using the double-layered container of the present invention, when the contents are discharged by squeezing with the opening facing downwards, the squeezing force and the weight of the contents apply pressure to the inner layer, pushing it towards the outer layer. As a result, the inner layer is tightly sealed against the air inlet formed in the outer layer, allowing the contents to be discharged smoothly by squeezing. After discharge, the squeezing force is released, and the double-layered container returns to an upright position. The pressure applied to the inner layer is released, and the inner layer quickly peels off from the outer layer, allowing air (outer air) to be rapidly introduced between the inner and outer layers.

[0017] According to the present invention, a double-walled container can be provided that provides a user experience comparable to that of a container with a valve component in the air inlet, while reducing the number of components and lowering manufacturing costs.

[0018] (Second viewpoint) According to the present invention, a double-layer container is provided, comprising a container body and a valve component. The container body has an inner bag and an outer shell configured to cover the inner bag. The outer shell is provided with an external air inlet hole for introducing external air into the space between the outer shell and the inner bag. The valve component is configured to control the airflow through the external air inlet hole. The valve component has an anti-misalignment protrusion that engages with the container body to prevent misalignment of the valve component.

[0019] In the double-layer container of the present invention, since the anti-misalignment protrusion provided on the valve component engages with the container body, misalignment of the valve component can be prevented.

[0020] Various embodiments of the present invention are illustrated below. The embodiments shown below can be combined with each other.

[0021] Preferably, a central recessed area and a peripheral area are provided at the bottom of the container body, the peripheral area is provided with a valve component receiving recess, the external air inlet is disposed in the valve component receiving recess, and the valve component is received in the valve component receiving recess.

[0022] Preferably, in the double-layered container, the valve component receiving recess opens toward the side of the container body, and the valve component can be inserted into the valve component receiving recess from the side.

[0023] Preferably, in the double-layered container, the insertion direction of the valve component is perpendicular to the long side direction of the sealing portion provided on the bottom surface of the container body.

[0024] Preferably, in the double-layered container, the valve component has a tapered front end.

[0025] Preferably, in the double-layered container, the anti-misalignment protrusion engages with the protrusion receiving recess disposed within the valve component receiving recess.

[0026] Preferably, in the double-layered container, the anti-misalignment protrusion engages with the external air inlet hole.

[0027] (Third viewpoint) According to the present invention, a method for manufacturing a double-layered container having a container body is provided. The method includes a molding step and an external air inlet hole forming step. In the molding step, a container molded body that becomes the container body is formed. The container molded body has an inner bag and an outer shell configured to cover the inner bag. In the external air inlet hole forming step, the outer shell is partially cut off from a protrusion provided on the container molded body using a cutting tool, thereby forming an external air inlet hole in the outer shell that allows external air to be introduced into the space between the outer shell and the inner bag. The external air inlet hole forming step is performed with a sliding inhibition means provided to inhibit the cutting tool from sliding towards the top of the protrusion when the cutting tool abuts against the protrusion and / or with a step provided on the protrusion indicating the cut position of the protrusion.

[0028] In the method of the present invention, since the sliding suppression means are provided and / or the protrusion is provided with a step indicating the position of the protrusion cutting, the cutting tool will not slide or the cutting position will be misplaced, and the external air inlet hole of the container body can be formed with good accuracy.

[0029] Various embodiments of the present invention are illustrated below. The embodiments shown below can be combined with each other.

[0030] Preferably, in the method, the external air inlet hole forming process is performed while the sliding suppression means is provided, the sliding suppression means including an extension portion that extends from the protrusion toward the cutting tool side.

[0031] Preferably, in the method, the external air inlet hole forming process is performed while the sliding suppression means is provided, the sliding suppression means including a guide provided on the cutting tool. Attached Figure Description

[0032] Figure 1 (First viewpoint) is a schematic front view of the main body of the double-layered container.

[0033] Figure 2 This is a schematic side view showing the container body with the cap installed.

[0034] Figure 3 This is a schematic cross-sectional view of the area near the opening of the container body.

[0035] Figure 4 It is a schematic cross-sectional view of the mouth of the container body with the cap installed.

[0036] Figure 5It is an enlarged schematic front view showing the area near the opening of the container body.

[0037] Figure 6 This is a diagram illustrating the usage of a two-layer container, where... Figure 6 A is a schematic cross-sectional view of the main part representing the discharge state of the contents. Figure 6 B is a schematic cross-sectional view of the main part representing the state of returning to an upright position.

[0038] Figure 7 (Second viewpoint) is a perspective view of the double-layer container 1 of the first embodiment of the present invention viewed from the bottom 2c side.

[0039] Figure 8 middle, Figure 8 A is Figure 7 Bottom view of the double-layered container 1, Figure 8 B is along Figure 8 Cross-sectional view of line BB in section A.

[0040] Figure 9 middle, Figure 9 A is along Figure 8 Cross-sectional view of line AA in B. Figure 9 B is along Figure 8 Cross-sectional view of line BB in B.

[0041] Figure 10 yes Figure 7 The decomposed 3D diagram of region A.

[0042] Figure 11 yes Figure 9 A diagram of the decomposition of B.

[0043] Figure 12 This is related to the second embodiment of the present invention. Figure 11 The corresponding diagram.

[0044] Figure 13 This is related to the third embodiment of the present invention. Figure 9 The diagram corresponding to A Figure 13 A and Figure 13 B represents the state before and after the valve component 3 is housed in the valve component housing recess 7.

[0045] Figure 14 This is related to the fourth embodiment of the present invention. Figure 10 The corresponding diagram.

[0046] Figure 15 This is related to the fifth embodiment of the present invention. Figure 9 The diagram corresponding to A.

[0047] Figure 16 This is related to the sixth embodiment of the present invention. Figure 8The diagram corresponding to B.

[0048] Figure 17 This is related to the seventh embodiment of the present invention. Figure 9 The diagram corresponding to A.

[0049] Figure 18 In (the third viewpoint), Figure 18 A is related to the first embodiment of the present invention. Figure 8 The diagram corresponding to B, Figure 18 B is Figure 18 A magnified view of region B in area A. Figure 18 C indicates from Figure 18 State A is the state after the outer shell 42 is removed from the protrusion 22a.

[0050] Figure 19 middle, Figure 19 A~ Figure 19 C is related to the second embodiment of the present invention. Figure 18 A~ Figure 18 The diagram corresponding to C.

[0051] Figure 20 This is related to the third embodiment of the present invention. Figure 19 The diagram corresponding to A.

[0052] Figure 21 middle, Figure 21 A~ Figure 21 B is related to the fourth embodiment of the present invention. Figure 18 A~ Figure 18 The diagram corresponding to B.

[0053] Figure 22 This is related to the fifth embodiment of the present invention. Figure 8 The diagram corresponding to B. Detailed Implementation

[0054] The embodiments of the present invention will be described below. The various features shown in the embodiments described below can be combined with each other. Furthermore, each feature can independently constitute an invention. Items described in different viewpoints can also be combined with each other.

[0055] (First viewpoint) like Figure 1 As shown, the double-layered container 1 of this embodiment is mainly composed of a receiving section (body) 23 for containing contents and a mouth 4 for discharging contents from the receiving section 23. In this embodiment, the receiving section 23 is shaped with a shoulder and has a mouth 4 at its front end. The external dimensions of the mouth 4 are smaller than the external dimensions of the receiving section 23.

[0056] like Figure 2As shown, a cap 5 is installed at the opening 4 of the container body 2, and the contents of the container body 2 are discharged from the outlet provided on the cap 5. It should be noted that... Figure 2 From Figure 1 The side view after rotating the container body 2 by 90°.

[0057] The double-layer container 1 in this embodiment is a so-called stacked peeling container, such as... Figure 3 As shown, the container body 2 has an outer layer 11 as a shell and an inner layer 12 as an inner bag in the receiving part 23 and the opening 4. The inner layer 12 shrinks as the contents decrease.

[0058] The outer layer 11 and the inner layer 12 are supplied for blow molding, for example, in the form of a multi-layer preform, and are molded in an integrally joined state. However, in its intended use, for example, the inner layer 12 is pre-peeled from the outer layer 11 except for the opening 4 before use (pre-peeling), and the contents are filled until the inner layer 12 contacts the outer layer 11. The inner layer 12 shrinks by extruding the contents. Alternatively, with the inner layer 12 joined to the outer layer 11, the inner layer 12 peels off from the outer layer 11 and shrinks as the contents are discharged.

[0059] The layer structure of the container body 2 will be further explained. As described above, the container body 2 has an outer layer 11 and an inner layer 12, wherein the outer layer 11 is formed to be thicker than the inner layer 12 in order to have higher resilience.

[0060] The outer layer 11 is made of, for example, low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, ethylene-propylene copolymer, and mixtures thereof. The outer layer 11 can be multi-layered. For example, it can be composed of layers formed from raw materials sandwiching the recycled layer on both sides. Here, the recycled layer refers to a layer made from scraps generated during container molding. A specific example of the layer composition of the outer layer 11 is a three-layer composition: a polypropylene (PP) layer, a recycled layer, and another polypropylene (PP) layer. Furthermore, adding a lubricant to the portion of the outer layer 11 that contacts the inner layer 12 can also promote the peeling of the outer layer 11 from the inner layer 12.

[0061] The inner layer 12 includes, for example, an EVOH layer disposed on the outer side of the container, an inner surface layer disposed on the inner side of the EVOH layer, and an adhesive layer disposed between the EVOH layer and the inner surface layer. A specific example of the layer structure of the inner layer 12 is a three-layer structure consisting of an EVOH layer, an adhesive layer, and a polyethylene (PE) layer. By providing the EVOH layer, gas barrier properties and peelability from the outer layer 11 can be improved.

[0062] The EVOH layer is a layer composed of ethylene-vinyl alcohol copolymer (EVOH) resin, obtained by hydrolysis of ethylene and vinyl acetate copolymer. The ethylene content of the EVOH resin is, for example, 25-50 mol%, and preferably 32 mol% or less from the viewpoint of oxygen barrier properties. There is no particular lower limit for the ethylene content, but since the lower the ethylene content, the easier it is for the flexibility of the EVOH layer to decrease, it is preferably 25 mol% or more. Furthermore, the EVOH layer preferably contains an oxygen absorber. By including an oxygen absorber in the EVOH layer, the oxygen barrier properties of the EVOH layer can be further improved.

[0063] The inner layer is the layer that comes into contact with the contents of the double-walled container 1, and is made of polyolefins such as low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, ethylene-propylene copolymer and mixtures thereof, preferably low-density polyethylene or linear low-density polyethylene.

[0064] An adhesive layer is a layer that functions to bond the EVOH layer to the inner layer. Examples include acid-modified polyolefins (e.g., maleic anhydride-modified polyethylene) with added carboxyl groups, or ethylene vinyl acetate copolymers (EVA). As an example of an adhesive layer, a mixture of low-density polyethylene or linear low-density polyethylene with acid-modified polyethylene is also an example.

[0065] Next, the cap 5 installed at the opening 4 of the container body 2 will be described.

[0066] The cap 5 is a so-called press-fit cap, and correspondingly, the opening 4 of the container body 2 is continuously formed with multiple segments of different outer diameters along the axial direction. Specifically, the opening 4 includes: a large-diameter opening 4a disposed at the upper end and extending axially; a small-diameter opening 4b disposed below the large-diameter opening 4a, with an outer diameter smaller than that of the large-diameter opening 4a and extending axially; and a maximum-diameter opening 4c disposed below the small-diameter opening 4b, with an outer diameter larger than that of the large-diameter opening 4a and extending axially. A support opening 4d is continuously formed below the maximum-diameter opening 4c, with an outer diameter smaller than that of the maximum-diameter opening 4c and larger than that of the large-diameter opening 4a. In addition, an annular recess 4e with an outer diameter approximately the same as that of the small-diameter opening 4b is formed between the support opening 4d and the receiving portion 23. This annular recess 4e is provided for the capping machine to hold when the cap 5 is pressed onto the opening 4.

[0067] Using the cap 5 described in this embodiment, internal pressure is applied to the container body 2 by the receiving portion 23 of the compression container body 2. After using an appropriate amount of contents, the user does not need to immediately operate the cap 5 by hand; instead, the inside of the container body 2 is sealed by the check valve 51. Specifically, as Figure 4As shown, the cap 5 consists of a cap body 5A having a contents discharge hole 52, and a cover body 5B connected to the main cap body 53 constituting the cap body 5A via a hinge 5C. That is, the main components of the cap 5 are the main cap body 53, which is connected to the cover body 5B and includes an annular wall portion; a check valve 51; and an inner plug 54 having a discharge hole 52. It should be noted that the cover body 5B can also be constructed independently and not connected to the cap body 5A via the hinge 5C.

[0068] The check valve 51 has the function of opening and closing the discharge port 52 by disengaging the valve portion from or residing in an annular valve seat surrounding the discharge port 52, and is, for example, molded using a polyethylene elastomer. An inner plug 54 disposed above the check valve 51 has a discharge channel 55 communicating with the discharge port 52 and discharging the contents from the discharge port 52 to the outside of the container. The main cap 53, including the cap body 5B, is made, for example, of polypropylene, and the inner plug 54 is made, for example, of polyethylene.

[0069] The double-layered container 1, serving as a stacking and peeling container, needs to have an air inlet hole. This air inlet hole is a through-hole located only in the outer layer 11 and does not reach the inner layer 12. Furthermore, by introducing air through this air inlet hole between the outer layer 11 and the inner layer 12, which serve as the outer shell, only the inner layer 12 contracts as the contents are discharged. On the other hand, by introducing air through the air inlet hole, the outer layer 11 can recover its original shape through its own restorative force.

[0070] Typically, a valve (check valve) is installed at the air inlet to facilitate the discharge of contents and the restoration of the outer layer. However, installing a valve increases the number of components and manufacturing costs. Therefore, the double-layer container 1 of this embodiment omits the valve, and by optimizing the placement of the air inlet, the same user experience as when the valve is present can be achieved even without it, thus reducing the number of components and suppressing cost increases.

[0071] That is, the main technical feature of the double-layer container 1 of the present invention is that an air inlet 20 without a valve is formed in the outer layer 11. Functionally, the air inlet 20 can be opened and closed by contacting and separating from the inner layer 12. "Without a valve" means that, as described above, the inner layer 12 has a valve function without adding any other components as valve components.

[0072] In order to reduce the number of parts, the inventors researched the removal of the valve component (check valve) and found that the location of the air inlet hole used to separate the outer and inner layers of the double-walled container makes a difference in user experience. Furthermore, when discharging the contents, the opening needs to be positioned downwards, and it was found that the opening (especially the neck portion at the base of the opening) is the most suitable location for the outer and inner layers to easily make close contact. Moreover, placing the air inlet hole in this location provides a user experience comparable to that with a valve. Typically, the opening and neck are round, which has the advantages of being less prone to deformation and leakage during discharge.

[0073] Figure 5 This is an enlarged view showing the area near the opening 4 of the double-layered container 1 in this embodiment. In this embodiment, an air inlet hole 20 is formed in the annular recess 4e formed in the opening 4 of the container body 2, particularly near the base end of the opening 4. As described above, the annular recess 4e is provided for the capping machine to hold when the cap 5 is pressed onto the opening 4. The annular recess 4e has a smaller diameter than other parts and forms an annular groove when viewed from the outside. It is formed by molding in an inwardly protruding shape.

[0074] The annular recess 4e has a smaller outer diameter than other parts. Because the blow molding process is relatively small, it is formed to be thicker than other parts. The opening and neck are round, making them less prone to deformation during discharge. The greater thickness of the annular recess 4e further reduces deformation and suppresses air leakage. In addition, the annular recess 4e is formed in an inwardly protruding shape, making it easier to apply internal pressure. This allows the inner layer 12 to be reliably pressed against the outer layer 11, thereby reliably sealing the air inlet hole 20.

[0075] At this time, the opening diameter d of the air inlet hole 20 is preferably 1.0 mm to 1.5 mm. If the opening diameter d of the air inlet hole 20 is greater than 1.5 mm, the inner layer 12 will not seal the air inlet hole 20 sufficiently, and air leakage may occur. Conversely, if the opening diameter d of the air inlet hole 20 is less than 1.0 mm, it may prevent air from entering between the outer layer 11 and the inner layer 12.

[0076] It should be noted that the air inlet 20 is preferably formed on the opposite side of the hinge 5C of the cap 5 at a 180° angle. When discharging the contents using the double-walled container 1, the cap 5B connected by the hinge 5C is opened, and the opening 4 is squeezed towards the container. At this time, if the air inlet 20 is formed on the opposite side of the hinge 5C of the cap 5 at a 180° angle, the air inlet 20 is located below the opening 4, the gravity of the contents is easily applied, and the air inlet 20 can be reliably sealed.

[0077] Furthermore, in the double-layered container 1 of this embodiment, the annular recess 4e formed at the opening 4 is not covered by the cap 5, therefore the air inlet hole 20 formed at the annular recess 4e is also not covered by the cap 5. In addition, as described above, the air inlet hole 20 in the double-layered container 1 of this embodiment is not provided with a valve component (check valve), and there is no valve in the path through which air is introduced into the air inlet hole 20. It is known, for example, that the air inlet hole is located in a position covered by the cap, and a valve is provided in the air inlet path of the cap, but even in this case, no valve component is provided.

[0078] Figure 6 This illustrates the usage configuration of the double-layered container 1 in this embodiment. It should be noted that... Figure 6 The structure of the cap 5 has been simplified, and the check valve 51 has been omitted. The contents M filled in the double-layered container 1 are, for example, mayonnaise, ketchup, soy sauce, orange vinegar, olive oil, seasoning sauce, pork chop sauce, mustard, etc.

[0079] like Figure 6 As shown in Figure A, in order to discharge the contents M of the double-walled container 1, the double-walled container 1 is tilted so that the opening 4 is at the bottom, and the receiving portion 23 of the double-walled container 1 is squeezed (pressed). At this time, the contents M of the double-walled container 1 fall from the receiving portion 23 toward the opening 4, and its gravity acts on the inner layer 12 near the opening 4. In addition, the squeezing force also acts as a force to press the contents M, resulting in the inner layer 12 being pressed from the inside, tightly adhering to the outer layer 11 and sealing the air inlet hole 20.

[0080] If squeezed in this state, the air between the outer layer 11 and the inner layer 12 will not escape from the air inlet hole 20. The squeezing force acts on the contents M, causing the contents M to be discharged from the discharge channel 55 of the cap 5. The user experience is also good.

[0081] After discharge, place the double-layered container 1 in an upright position. At this time, as... Figure 6 As shown in Figure B, the contents M fall into the receiving section 23, thus peeling the inner layer 12 from the outer layer 11. Therefore, the air inlet 20 provided in the outer layer 11 is also open, and air is rapidly introduced between the outer layer 11 and the inner layer 12. As a result, the inner layer 12 contracts in position, and the outer layer 11 returns to its original shape.

[0082] As described above, in the double-layer container 1 of this embodiment, a valve component (check valve) is not provided in the air inlet hole 20. By simply designing the formation position of the air inlet hole 20, a user experience no less than that when the air inlet hole 20 is provided with a valve component can be achieved.

[0083] The embodiments applicable to this invention have been described above, but this invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of this invention.

[0084] (Second viewpoint) 1. First Implementation Method use Figures 7-11 The double-layered container 1 according to the first embodiment of the present invention will be described. The double-layered container 1 of this embodiment includes a container body 2 and a valve component 3. This double-layered container 1 is a squeeze-type container that discharges contents by compressing the container body 2.

[0085] Figure 7 As shown, the container body 2 includes a mouth 2a, a body 2b, and a bottom 2c. The mouth 2a is a cylindrical (preferably cylindrical) portion with an open end. The mouth 2a has a locking part for mounting mouth fittings such as caps or pumps. The mouth fitting has a check valve (not shown), configured to discharge contents and prevent external air from flowing into the container body 2.

[0086] The mantle 2b is disposed adjacent to the mouth 2a on the side furthest from the opening end compared to the mouth 2a. The outer diameter of the mantle 2b is larger than that of the mouth 2a (in this specification, when the cross-section is not circular, "outer diameter" refers to the diameter of the circumscribed circle). The mantle 2b is cylindrical, and the bottom 2c is located at the lower end of the mantle 2b, closing the lower end of the mantle 2b.

[0087] Figure 8 As shown in Figure B, the container body 2 includes an inner bag 14 and an outer shell 42 configured to cover the inner bag 14. The inner bag 14 contracts as the contents inside decrease. An external air inlet 15 is provided on the outer shell 42 to allow external air to enter the space between the outer shell 42 and the inner bag 14.

[0088] The outer shell 42 is made of, for example, low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, ethylene-propylene copolymer, or other polyolefins. The inner bag 14 is preferably made of multiple layers. For example, the layer in contact with the outer shell 42 is an EVOH layer made of ethylene-vinyl alcohol copolymer (EVOH) resin, and the layer in contact with the contents is, for example, an inner surface layer made of the aforementioned polyolefins. Furthermore, it is preferable to provide an adhesive layer between the EVOH layer and the inner surface layer.

[0089] The container body 2 can be formed by direct blow molding. In this case, a sealing part 27 is provided at the bottom 2c of the container body 2, which is formed by flattening the cylindrical preform using a split mold and fusing the opposing preforms together. In order to improve the sealing strength, the sealing part 27 preferably protrudes from the bottom surface, but it may not protrude.

[0090] Valve component 3 is configured to control the airflow through external air inlet 15. For example... Figure 9As shown in Figure B, the anti-misalignment protrusion 3c of the valve component 3 engages with the container body 2. The anti-misalignment protrusion 3c is a protrusion that prevents the valve component 3 from moving along its insertion direction. By engaging the anti-misalignment protrusion 3c with the container body 2, misalignment of the valve component 3 can be prevented.

[0091] Figure 10 As shown, a central recessed region 2c1 and a peripheral region 2c2 are provided at the bottom 2c of the container body 2. The peripheral region 2c2 forms the ground plane of the container body 2. A valve component receiving recess 7 is provided in the peripheral region 2c2. An external air inlet 15 is disposed within the valve component receiving recess 7. The valve component 3 is received within the valve component receiving recess 7. In this state, as... Figure 9 As shown in Figure A, the outer surface of valve component 3 is coplanar with the surrounding area 2c2, and the outer surface of valve component 3 constitutes part of the ground plane of container body 2.

[0092] like Figure 9 B and Figure 10 As shown, the valve component receiving recess 7 opens toward the side 2d of the container body 2, and the valve component 3 can be inserted into the valve component receiving recess 7 from the side 2d.

[0093] The more specific structure is as follows. For example... Figure 9 As shown in Figure A, the valve component receiving recess 7 has a wide portion 7a and a narrow portion 7b. The narrow portion 7b is narrower than the wide portion 7a. The wide portion 7a is connected to the narrow portion 7b, and the narrow portion 7b is positioned closer to the outer surface of the bottom 2c of the container body 2 than the wide portion 7a. The valve component 3 has a wide portion 3a and a narrow portion 3b. The narrow portion 3b is narrower than the wide portion 3a. The wide portion 3a is connected to the narrow portion 3b. The wide portion 3a can be received within the wide portion 7a, preferably a complementary shape to the wide portion 7a. The narrow portion 3b can be received within the narrow portion 7b, preferably a complementary shape to the narrow portion 7b. Because the wide portion 3a is wider than the narrow portion 7b, the valve component 3 cannot be inserted into the valve component receiving recess 7 from the bottom 2c side. On the other hand, the wide portion 3a and the narrow portion 3b can be inserted into the wide portion 7a and the narrow portion 7b from the side 2d.

[0094] The insertion direction of the valve component 3 from the side 2d is preferably perpendicular to the long side direction of the sealing part 27. Figure 8 (The left and right direction of A). In other words, this direction is the opening and closing direction of the split mold during blow molding, and the valve component receiving recess 7 extending in this direction can be easily formed with good precision.

[0095] Valve component 3 includes a housing 34 and a valve core 35. For example... Figure 8 B and Figure 10As shown, the housing 34 has an outer opening 34a, a container-side opening 34b, and a valve core insertion opening 34c. These openings communicate with each other inside the housing 34. The outer opening 34a opens outward and faces the central recessed region 2c1. The container-side opening 34b opens towards the external air inlet 15. The valve core insertion opening 34c opens towards the side 2d. Figure 9 As shown in Figure A, the outer opening 34a is positioned in the narrow section 3b, as... Figure 10 and Figure 11 As shown, the container-side opening 34b and the valve core insertion opening 34c are disposed in the wide portion 3a. The external air inlet 15 is formed on the protrusion 7d provided within the valve component receiving recess 7, as shown... Figure 8 As shown in B, the protrusion 7d is housed within the container side opening 34b.

[0096] The valve core 35 can be inserted into the housing 34 through the valve core insertion opening 34c. For example... Figure 8 As shown in Figure B, the valve core 35 is configured to open and close the flow path 34d between the outer opening 34a and the container-side opening 34b. Specifically, the valve core 35 includes a base 35a and a flap 35b extending from the base 35a. A hinge portion 35c is provided between the base 35a and the flap 35b. The base 35a is located on the valve core insertion opening 34c side of the flap 35b, and the base 35a closes the valve core insertion opening 34c. The valve core 35 is made of an elastic component such as rubber, and the flap 35b is configured to rotate around the base 35a as a fulcrum, thereby opening and closing the flow path 34d. The hinge portion 35c is used to facilitate the rotation of the flap 35b and can be omitted when not needed. In addition, the valve core 35 can open and close the flow path 34d simply by moving within the housing 34; for example, it can be the ball of a ball valve.

[0097] When the contents of the double-walled container 1 are discharged, if the outer shell 42 is compressed, the air in the intermediate space between the outer shell 42 and the inner bag 14 presses the fins 35b against the flow path 34d, thus closing the flow path 34d. In this state, air does not flow out from the external air inlet 15, so the pressure applied to the outer shell 42 is transmitted to the inner bag 14, discharging the contents. After the contents are discharged, if the force applied to the outer shell 42 is released, the intermediate space between the outer shell 42 and the inner bag 14 is depressurized by the restoring force of the outer shell 42, the fins 35b are opened, and air from the outer opening 34a flows into the intermediate space through the external air inlet 15. As a result, the outer shell 42 quickly returns to its original shape.

[0098] like Figure 11As shown, the anti-misalignment protrusion 3c is configured to protrude from both sides of the wide portion 3a. Both sides of the wide portion 7a are provided with protrusion receiving recesses 7c for accommodating the anti-misalignment protrusion 3c. By engaging the anti-misalignment protrusion 3c with the protrusion receiving recesses 7c, misalignment of the valve component 3 relative to the container body 2 can be prevented. The anti-misalignment protrusion 3c is provided with an inclined surface 3c1 that slopes downward toward the front end 3d of the valve component 3, thereby preventing the anti-misalignment protrusion 3c from abutting against the edge of the wide portion 7a and hindering insertion.

[0099] The anti-misalignment protrusion 3c is positioned further away from the front end 3d of the valve component 3 than the side opening 34b of the container. This is because the closer the anti-misalignment protrusion 3c is to the front end 3d, the longer the distance at which the valve component 3 is inserted will experience strong frictional resistance, and the greater the load when the valve component 3 is inserted.

[0100] The anti-misalignment protrusion 3c can be configured at any position that prevents the valve component 3 from misaligning. For example, it can be provided in the narrow section 3b or on the bottom surface 3e of the valve component 3 (the surface with the container side opening 34b). In addition, when the anti-misalignment protrusion 3c is provided on the bottom surface 3e of the valve component 3, the anti-misalignment protrusion 3c can also engage with the external air inlet hole 15.

[0101] 2. Second Implementation Method use Figure 12 The double-layered container 1 according to the second embodiment of the present invention will be described. This embodiment is similar to the first embodiment, with the main difference being that the front end of the valve component 3 is tapered. The following description focuses on the differences.

[0102] In this embodiment, the front end of the valve component 3 is tapered, and the front end of the valve component receiving recess 7 is also tapered. This configuration makes it easier to insert the valve component 3. It should be noted that if the front end of the valve component 3 is tapered, misalignment of the valve component 3 is more likely. However, in this embodiment, since the anti-misalignment protrusion 3c of the valve component 3 engages with the container body 2, misalignment can be prevented even if the front end of the valve component 3 is tapered.

[0103] 3. Third Implementation Method use Figure 13 The double-layered container 1 according to the third embodiment of the present invention will be described. This embodiment is similar to the first embodiment, and the following description focuses on the differences.

[0104] In the first embodiment, the valve component 3 is inserted into the valve component receiving recess 7 from the side 2d. However, in this embodiment, the valve component receiving recess 7 does not have a narrow portion 7b, and the valve component 3 can be inserted into the valve component receiving recess 7 from a direction perpendicular to the peripheral area 2c2 of the bottom 2c. Furthermore, the valve component 3 has a main body portion 3f and an insertion portion 3g protruding from the main body portion 3f into the external air inlet hole 15. The insertion portion 3g is inserted into the external air inlet hole 15. The insertion portion 3g has an anti-misalignment protrusion 3c. The anti-misalignment protrusion 3c engages with the edge of the external air inlet hole 15 from the inside of the outer casing 42, thereby preventing misalignment of the valve component 3. In this embodiment, when the insertion portion 3g is inserted into the external air inlet hole 15, the inner bag 14 can be pressed, causing the inner bag 14 to peel off from the outer casing 42 near the external air inlet hole 15. This improves the external air inlet capacity into the space between the outer casing 42 and the inner bag 14.

[0105] It should be noted that the insertion part 3g does not participate in the valve function of the valve component 3, and the valve function is realized only by the main body part 3f. Specifically, the main body part 3f is provided with a valve core 35, which is the same as that in the first embodiment. The valve core 35 opens and closes the flow path 34d between the outer opening 34a and the container side opening 34b, thereby performing the valve function of the valve component 3.

[0106] 4. Fourth Implementation Method use Figure 14 The double-layered container 1 according to the fourth embodiment of the present invention will be described. This embodiment is similar to the first embodiment, and the following description focuses on the differences.

[0107] In this embodiment, an elastic member 3i (e.g., a leaf spring) is disposed on the upper surface 3h (the surface opposite to the bottom surface 3e) of the valve component 3. The thrust of the elastic member 3i pushes the bottom surface 3e (refer to the bottom surface 3e) of the valve component 3. Figure 8 The bottom surface 7e (the surface with the external air inlet hole 15) of the valve component receiving recess 7 is pressed down. If there is a gap between the bottom surface 3e and the bottom surface 7e, air will leak out from the gap between the bottom surface 3e and the bottom surface 7e when the outer shell 42 is compressed during the discharge of the contents, and there is a problem that the pressure applied to the outer shell 42 is not easily transmitted to the inner bag 14. However, in this embodiment, since the bottom surface 3e is pressed against the bottom surface 7e, such air leakage can be suppressed. The elastic members 3i are preferably provided on both sides of the narrow portion 3b.

[0108] It should be noted that this embodiment relates to an invention that is independent of the anti-misalignment protrusion 3c, in which the anti-misalignment protrusion 3c is not necessary.

[0109] That is, according to the invention of this viewpoint, a double-walled container is provided, which includes a container body and a valve component. The container body has an inner bag and an outer shell configured to cover the inner bag. The outer shell is provided with an external air inlet hole that allows external air to be introduced into the space between the outer shell and the inner bag. The valve component is configured to control the airflow through the external air inlet. The valve component has a first surface with an opening connected to the external air inlet port. The outer casing has a second side with the aforementioned external air inlet hole. The first side is pressed against the second side by force.

[0110] 5. Fifth Implementation Method use Figure 15 The double-layered container 1 according to the fifth embodiment of the present invention will be described. This embodiment is similar to the first embodiment, and the following description focuses on the differences.

[0111] In this embodiment, a filler material 8 is provided between the bottom surface 3e of the valve component 3 and the bottom surface 7e of the valve component receiving recess 7, surrounding the external air inlet hole 15. If there is a gap between the bottom surface 3e and the bottom surface 7e, when the contents are discharged and the outer casing 42 is compressed, air between the bottom surface 3e and the bottom surface 7e will leak out through the gap, thus making it difficult for the pressure applied to the outer casing 42 to be transmitted to the inner bag 14. However, in this embodiment, by providing the filler material 8, such air leakage can be suppressed. The filler material 8 is preferably annular. It is preferable to provide a recess for receiving the filler material 8 on at least one of the bottom surface 3e and the bottom surface 7e.

[0112] It should be noted that this embodiment is an invention independent of the anti-misalignment protrusion 3c; in this type of invention, the anti-misalignment protrusion 3c is not essential. Furthermore, by using the filler material 8 of this embodiment in conjunction with the elastic member 3i of the fourth embodiment, air leakage can be further suppressed.

[0113] That is, according to the invention of this viewpoint, a double-walled container is provided, which includes a container body and a valve component. The container body has an inner bag and an outer shell configured to cover the inner bag. The outer shell is provided with an external air inlet hole that allows external air to be introduced into the space between the outer shell and the inner bag. The valve component is configured to control the airflow through the external air inlet. The valve component has a first surface with an opening connected to the external air inlet port. The outer casing has a second side with the aforementioned external air inlet hole. A filler material surrounding the external air inlet hole is provided between the first and second surfaces.

[0114] 6. Sixth Implementation Method use Figure 16The double-layered container 1 according to the sixth embodiment of the present invention will be described. This embodiment is similar to the first embodiment, and the following description focuses on the differences.

[0115] The valve component 3 is configured to open and close the flow path 34d by rotating the vane 35b of the valve core 35 around the base 35a. Preferably, the vane 35b is in close contact with the flow path 34d when the outer shell 42 is not compressed. If the vane 35b is not in close contact with the flow path 34d, the flow path 34d will open immediately after the outer shell 42 is compressed, and air will escape with the compression, resulting in the compression force applied to the outer shell 42 not being transmitted to the inner bag 14. If this happens, there may be a problem of poor responsiveness when discharging a small amount. In this embodiment, to solve this problem, the vane 35b is pressed against the surface where the flow path 34d is provided by the force applied by the elastic member 3j (e.g., a leaf spring). That is, the vane 35b is forced in the direction of closing the flow path 34d. This improves the responsiveness when discharging a small amount.

[0116] It should be noted that this embodiment relates to an invention established without regard to the anti-misalignment of the anti-misalignment protrusion 3c, in which the anti-misalignment protrusion 3c is not necessary.

[0117] That is, according to the invention of this viewpoint, a double-walled container is provided, which includes a container body and a valve component. The container body has an inner bag and an outer shell configured to cover the inner bag. The outer shell is provided with an external air inlet hole that allows external air to be introduced between the outer shell and the inner bag. The valve component is configured to control the airflow through the external air inlet. The valve component is configured to open and close the airflow path as the vane rotates. The vane applies force in the direction of closing the flow path.

[0118] 7. Seventh Implementation Method use Figure 17 The double-layered container 1 according to the seventh embodiment of the present invention will be described. This embodiment is similar to the first embodiment, and the following description focuses on the differences.

[0119] The wide portion 3a of the valve component 3 is housed within the wide portion 7a. However, if a manufacturing deviation results in the height of the wide portion 7a being slightly lower than the height of the wide portion 3a, the narrow portion 7b may be pushed upwards by the wide portion 3a when the valve component 3 is inserted into the valve component receiving recess 7, causing it to protrude from the peripheral region 2c2. Since the peripheral region 2c2 and the valve component 3 constitute the ground plane of the container body 2, if the narrow portion 7b protrudes from the peripheral region 2c2, the container body 2 will wobble when it touches the ground. In this embodiment, to solve this problem, a chamfered portion 7b1 is formed by chamfering the outer edge of the narrow portion 7b. The chamfer can be a C-shaped chamfer or an R-shaped chamfer. With the chamfered portion 7b1, even if the narrow portion 7b is pushed upwards by the wide portion 3a, it is less likely to protrude from the peripheral region 2c2, thus suppressing the occurrence of the aforementioned problem.

[0120] It should be noted that this embodiment relates to an invention established without regard to the anti-misalignment of the anti-misalignment protrusion 3c, in which the anti-misalignment protrusion 3c is not necessary.

[0121] That is, according to the invention of this viewpoint, a double-walled container is provided, which includes a container body and a valve component. The container body has an inner bag and an outer shell configured to cover the inner bag. The outer shell is provided with an external air inlet hole that allows external air to be introduced into the space between the outer shell and the inner bag. The valve component is configured to control the airflow through the external air inlet. The valve component is disposed within the valve component receiving recess. The valve component receiving recess has a wide portion and a narrow portion. The width of the narrow portion is narrower than that of the wide portion. The wide portion is connected to the narrow portion, and the narrow portion is positioned closer to the outer side of the container body than the wide portion. The outer edge of the narrow section is chamfered.

[0122] (Third viewpoint) 1. First Implementation Method The double-layered container 1 manufactured using the method of this embodiment is similar to the double-layered container 1 of the first embodiment of the second viewpoint. The matters described in the first embodiment of the second viewpoint also apply to this embodiment as long as they do not depart from their essence. In this embodiment, the double-layered container 1 can be a squeeze-type container that discharges contents by compressing the container body 2, or a pump-type container that draws out the contents by the action of a pump.

[0123] use Figure 18The manufacturing method of the double-layer container 1 according to the first embodiment of the present invention will be described. This method includes a molding process and an external air inlet hole forming process. Each process will be described below.

[0124] (1) Molding process like Figure 18 As shown in Figure A, during the molding process, a container molded body 22 is formed to become the container body 2. The container molded body 22, like the container body 2, has an inner bag 14 and an outer shell 42 configured to cover the inner bag 14.

[0125] The container body 22 can be formed by direct blow molding or biaxial stretch blow molding. The container body 22 has a portion with the same shape as the container body 2. The container body 2 is formed by forming an external air inlet 15 in the container body 22, removing burrs if present, and removing the bag portion if the opening is sealed by the bag portion. When using direct blow molding, the container body 22 is formed by holding a molten cylindrical preform extruded from an extruder with a pair of separate dies and blowing air into the preform. When using biaxial stretch blow molding, the container body 22 is formed by heating a preform consisting of an outer preform covering an inner preform and performing biaxial stretch blow molding.

[0126] (2) External air inlet hole formation process In the process of forming the external air inlet hole, the outer shell 42 is partially removed from the protrusion 22a provided on the container molding body 22 using a cutting tool 25, thereby forming an external air inlet hole 15 in the outer shell 42 that allows external air to be introduced into the space between the outer shell 42 and the inner bag 14, resulting in... Figure 18 The structure shown in C.

[0127] Partial removal of the outer casing 42 can be performed by sliding the cutting tool 25. This forms the external air inlet 15. The cutting tool 25 can move along... Figure 18 A slides left and right. The surface P formed by the outer edge of the external air inlet 15 coincides with the surface formed by the trajectory of the sliding movement of the cutting tool 25. In other words, the partial removal of the outer shell 42 is not done by hollowing out the outer shell 42 in a cylindrical shape, but by cutting the outer shell 42.

[0128] When removing the outer casing 42 using this method, when the cutting tool 25 abuts against the protrusion 22a, the cutting tool 25 may slide (relatively move) towards the top 22c of the protrusion 22a. When the cutting tool 25 slides, its height position may change; the protrusion 22a may be pressed down by the cutting tool 25 and become concave, resulting in a change in the height position of the top 22c; or both may change. That is, at least one of the cutting tool 25 and the top 22c is displaced, resulting in a change in their relative height position, and the cutting tool 25 slides towards the top 22c of the protrusion 22a. If the cutting tool 25 slides, the external air inlet hole 15 cannot be formed with good precision. Therefore, in this embodiment, a protrusion 22d is provided on the protrusion 22a as a means to suppress the sliding of the cutting tool 25 towards the top of the protrusion 22a. The protrusion 22d is the part of the protrusion 22a that extends (protrudes) toward the cutting tool 25. If the cutting tool 25 is moved such that the front end of the cutting tool 25 enters the root side of the protrusion 22d, the protrusion 22d can prevent the cutting tool 25 from sliding toward the top 22c. The protrusion 22d can be formed by providing a groove in the protrusion 22a, or by providing a protrusion that protrudes from the protrusion 22a toward the cutting tool 25.

[0129] In this embodiment, the protrusion 22a is provided with a step 22b, the root of which coincides with the root of the protrusion 22d. In this embodiment, since the protrusion 22a is cut off at the root of the step 22b, a gap exists between the cutting tool 25 and the container molded body 22 in areas other than the protrusion 22a. Therefore, damage to the container molded body 22 by the cutting tool 25 can be suppressed.

[0130] 2. Second Implementation Method use Figure 19 The second embodiment of the present invention will be described. This embodiment is similar to the first embodiment, and the following description focuses on the differences.

[0131] In the first embodiment, the top 22c of the protrusion 22a is flat, but in this embodiment, the top 22c of the protrusion 22a is curved upwards. Furthermore, in the first embodiment, a step 22b is provided in the protrusion 22a, but in this embodiment, the protrusion 22a does not have a step 22b.

[0132] In this embodiment, a protrusion 22d is also provided in the protrusion 22a. If the cutting tool 25 is moved in such a way that the front end of the cutting tool 25 enters the root side of the protrusion 22d, the sliding of the cutting tool 25 toward the top 22c can be suppressed by the protrusion 22d.

[0133] 3. Third Implementation Method use Figure 20The third embodiment of the present invention will be described. This embodiment is similar to the second embodiment, and the following description focuses on the differences.

[0134] In this embodiment, instead of a protrusion 22d on the protrusion 22a, a guide 26 is provided on the cutting tool 25 as a means to suppress sliding of the cutting tool 25 toward the top of the protrusion 22a. The guide 26 is configured to abut against the upper surface of the cutting tool 25, and the cutting tool 25 is guided by the guide 26 to slide. With this configuration, the upward movement of the cutting tool 25 is hindered by the guide 26, thus suppressing the sliding of the cutting tool 25 toward the top of the protrusion 22a. It should be noted that the protrusion 22d and the guide 26 can also be used together.

[0135] 4. Fourth Implementation Method use Figure 21 The fourth embodiment of the present invention will be described. This embodiment is similar to the first embodiment, and the following description focuses on the differences.

[0136] In this embodiment, the protrusion 22a has the same step 22b as in the first embodiment, but the protrusion 22a does not have a protrusion 22d.

[0137] In this embodiment, it is envisioned that the protrusion 22a be cut at a height position between the top 22c and the root 22e of the protrusion 22a. However, if the protrusion 22a does not have the shape of the step 22b, it would be difficult to determine at which height position the protrusion 22a should be cut. On the other hand, in this embodiment, the protrusion 22a is provided with a step 22b, which serves as a marker indicating the cutting position of the protrusion 22a. For example, the protrusion 22a can be cut at the root of the step 22b. Therefore, according to this embodiment, the protrusion 22a can be cut at the correct position, improving the accuracy of the external air inlet hole 15 forming process.

[0138] 5. Fifth Implementation Method use Figure 22 The fifth embodiment of the present invention will be described. This embodiment is similar to the first embodiment, and the following description focuses on the differences.

[0139] In the first embodiment, the inner bag 14 is tightly attached to the outer shell 42 near the external air inlet hole 15, which makes it difficult to peel the inner bag 14 off the outer shell 42. To solve this problem, in this embodiment, the valve component 3 is configured to have a main body 3f and an insertion part 3g protruding from the main body 3f toward the external air inlet hole 15. The insertion part 3g is inserted into the external air inlet hole 15. When the insertion part 3g is inserted into the external air inlet hole 15, the inner bag 14 can be peeled off from the outer shell 42 near the external air inlet hole 15 by pressing it. As a result, the inner bag 14 is easily peeled off from the outer shell 42, improving the external air intake into the space between the outer shell 42 and the inner bag 14.

[0140] 6. Other implementation methods In the above embodiment, the external air inlet 15 is provided within the valve component receiving recess 7, but it can also be provided in other locations. For example, the external air inlet 15 can be provided in the body portion 2b.

[0141] In the above embodiment, the double-layer container 1 includes a valve component 3, but the valve component 3 may also have a different configuration than in the above embodiment, or it may be omitted. When the valve component 3 is omitted, the "valve component receiving recess 7" may be simply referred to as the "recess".

[0142] (Symbol Explanation) 1: Double-layer container 2: Container body 2a: Mouth 2b: Trunk 2c: Bottom 2c1: Central concave region 2c2: Surrounding Area 2D: Side View 3: Valve components 3a: Wide section 3b: Narrow section 3c: Anti-misalignment protrusion 3c1: Inclined surface 3D: Front-end 3e: Bottom surface 3f: Main body 3g: Insertion part 3h: Upper surface 3i: Elastic component 3j: Elastic component 4: Mouth 4a: Large diameter mouth 4b: Mouth of small diameter 4c: Maximum diameter nozzle 4D: Supports mouth area 4e: Annular recess 5: Cap 5A: Cap Body 5B: Cover 5C: Hinge 7: Valve component receiving recess 7a: Wide section 7b: Narrow section 7b1: Chamfered section 7c: Protrusion receiving recess 7d: protrusion 7e: Bottom surface 8: Filler material 11: Outer layer 12: Inner layer 14: Inner bag 15: External air inlet port 20: Air inlet hole 22: Container Molded Body 22a: convex part 22b: Steps 22c: Top 22d: Protruding part 22e: Root 23: Containment Department 25: Cutting tools 26: Guide component 27: Sealing part 34: Shell 34a: Outer opening 34b: Container side opening 34c: Valve core insertion opening 34d: Flow path 35: Valve core 35a: Base 35b: Wing 35c: Hinge section 42: Outer shell 51: Check valve 52: Discharge port 53: Main cap body 54: Nercer 55: Discharge channel.

Claims

1. A double-layered container having an outer layer and an inner layer, wherein the inner layer contracts as the contents contained within it decrease, the double-layered container being characterized in that... It has a carcass and a mouth, the mouth being smaller in size than the carcass and having an outlet. At the opening, an air inlet without a valve is formed on the outer layer. The double-layered container is configured such that when tilted with the opening facing downwards, the contents can be discharged by squeezing the body. When the contents are discharged, the inner layer adheres tightly to the air inlet hole, forming a sealed state, and the contents are smoothly discharged through the compression. The air inlet hole is formed in the neck portion, which is the base end side of the opening.

2. The double-layered container according to claim 1, wherein, A recess is provided in the neck, and the air inlet hole is formed in the recess.

3. The double-layered container according to claim 1, wherein, An annular recess is provided in the neck, and the air inlet hole is formed in the annular recess.

4. The double-walled container according to any one of claims 1 to 3, wherein, The opening diameter d of the air inlet is 1.0mm to 1.5mm.

5. The double-walled container according to any one of claims 1 to 3, wherein, The double-layered container has a cap installed at the opening. The air inlet is formed on the opposite side of the hinge portion of the cap at a position of 180°.

6. The double-walled container according to any one of claims 1 to 3, wherein, The double-layered container has a cap installed at the opening. The air inlet hole is not covered by the cap.

7. The double-layered container according to claim 6, wherein, The lower end of the cap is located above the air inlet hole.

8. The double-layered container according to claim 7, wherein, The opening diameter d of the air inlet is 1.0mm to 1.5mm.

9. The double-walled container according to any one of claims 1 to 3, wherein, A pressure-cap type cap is installed at the opening.

10. The double-walled container according to any one of claims 1 to 3, wherein, There is no valve in the path through which air is introduced into the air inlet.

11. The double-layered container according to claim 1, wherein, A pressure-cap is installed at the opening, but the air inlet is not covered by the cap. The opening diameter d of the air inlet hole is 1.0 mm to 1.5 mm, and the air inlet hole is formed on the opposite side of the hinge portion of the cap at a position of 180°.

12. The double-layered container according to claim 1, wherein, The opening has an annular recess, and the air inlet hole is formed in the annular recess. A pressure-cap type cap is installed at the opening. The annular recess is provided for the capping machine to hold when the cap is pressed onto the opening. The opening diameter d of the air inlet hole is 1.0 mm to 1.5 mm, and the air inlet hole is formed on the opposite side of the hinge portion of the cap at a position of 180°.

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