JP2017165452A - Double container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double container capable of maintaining airtightness at the time of storage, eliminating inconvenience at the time of opening, and maintaining sealability even after opening.SOLUTION: A double container has an outer layer container and an inner bag, and the inner bag is detached from the outer layer container and contracts as a content contained in the inner bag decreases. A mouth part is sealed with a seal member, a cap having a check valve is attached to the mouth part, and the cap has an inner plug member having a projecting part projecting toward the seal member. The projecting part is formed in a pointed shape at its tip, has a content passage penetrating from its midway position to an outflow side of the inner plug member, and breaks through and opens the seal part by screwing the cap. A hole part is formed on an inner cap at a position facing the projecting part, and a peripheral surface of the pointed projecting part comes into contact with a peripheral edge of the hole part of the inner cap when the cap is screwed.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a double container, and more particularly, to a novel double container sealed with a seal member.

  Conventionally, a container body having an outer layer container and an inner bag and shrinking as the contents are reduced, and an air flow between an intermediate space between the outer layer container and the inner bag and an outer space of the container body. 2. Description of the Related Art A double container (so-called laminated peeling container) including a check valve that adjusts access is known (see, for example, Patent Documents 1 and 2).

  In the delamination container disclosed in Patent Document 1, a valve is built in a cap attached to the mouth of the container body. In the delamination container disclosed in Patent Document 2, a valve is provided inside the body portion of the outer shell.

  In addition, the delamination container has the advantage that the contents in the inner bag do not come into contact with the air. For this reason, after the contents are poured out, the cap is prevented from flowing back into the inner bag. A valve is also provided, and it is also proposed to seal the mouth portion with aluminum in order to ensure hermeticity during storage (see, for example, Patent Document 3).

  In Patent Document 3, the mouth portion of the tube body that is impermeable to oxygen and has an elastic restoring force is closed with an oxygen-impermeable sealing material, and a plug body having a pouring hole is detachably attached to the mouth portion. The opening of the plug cylinder is opened and closed by a valve element that is closed by a negative pressure in the tube body, the cap is fitted on the plug cylinder, the sealing material is removed, and the mouth portion A tube container is disclosed in which the container is opened.

JP 2013-35557 A JP-A-4-267727 Japanese Patent Laid-Open No. 7-112749

  By the way, the blocking by the sealing material as described in Patent Document 3 is an effective means in terms of ensuring storage stability, but the opening is performed with a cylindrical cutting blade as described in Patent Document 3. Doing so may cause various inconveniences. For example, there is a possibility that a fragment of the sealing material adheres to the cutting blade as it is after the cutting and blocks the flow path. Moreover, when the sealing material is opened with a cylindrical cutting blade, it is difficult to maintain hermeticity. In order to maintain hermeticity even after opening, it is necessary to bring the outer peripheral surface of the cutting blade into close contact with the inner peripheral surface of the mouth portion. For this purpose, it is necessary to increase the molding accuracy of the cutting blade, leading to an increase in cost. .

  The present invention has been made in view of such conventional circumstances, can maintain airtightness at the time of storage, can eliminate inconvenience at the time of opening, and maintains hermeticity even after opening. An object is to provide a double container capable of this.

  In order to achieve the above-mentioned object, the double container of the present invention has an outer layer container and an inner bag, and the inner bag is peeled from the outer layer container as the contents stored in the inner bag are reduced. A double container that shrinks, the mouth is sealed with a seal member, and a cap having a check valve is attached to the mouth, the cap projectingly formed toward the seal member The projecting portion has a tip-pointed tip, a content passage penetrating from the midway position to the outflow side of the inner plug member, and screwing the cap The protruding portion of the inner plug member breaks the seal portion and is opened.

  By sealing the mouth with a sealing member, the sealing property during storage is ensured. In addition, by opening the seal member with a protruding portion in which the tip has a pointed shape and a content passage penetrating from the midway position to the outflow side of the inner plug member is formed, the flow path is blocked due to adhesion of fragments, etc. Failure is suppressed.

  According to the present invention, it is possible to provide a double container that can maintain airtightness during storage, can eliminate inconveniences during opening, and can maintain hermeticity even after opening. It is.

It is a perspective view which shows the structure of the double container of one Embodiment of this invention. It is a schematic sectional drawing of the double container shown in FIG. It is sectional drawing which shows the layer structure of an outer layer and an inner layer. It is a figure which shows the usage method of a double container. It is a schematic sectional drawing of a cap mounting part, and a seal member is a figure of an unopened state. It is a schematic bottom view of the protrusion part provided in the inside plug member. It is a schematic sectional drawing of a cap mounting part, and a seal member is a figure of an unsealed state.

  Hereinafter, an embodiment of a double container to which the present invention is applied will be described with reference to the drawings.

  As shown in FIG. 1, the double container 1 of the present embodiment is a so-called delamination container, which is mainly composed of a container main body 2, and the container main body 2 includes an accommodating portion 3 that accommodates contents, A mouth portion 4 for discharging contents from the housing portion 3 is provided. As shown in FIG. 2, the container body 2 includes an outer layer container 11 and an inner bag 12 that are outer shells in the accommodating portion 3 and the mouth portion 4, and the inner bag 12 is reduced as the contents are reduced. Shrink.

  The outer layer container 11 and the inner bag 12 are subjected to blow molding as a multi-layer parison and molded in a state of being integrally joined. For example, the inner bag 12 is peeled from the outer layer container 11 in advance before use. The contents are filled until the inner bag 12 contacts the outer container 11. By pushing out the contents, the inner bag 12 is smoothly contracted. Alternatively, the inner bag 12 may be left joined to the outer layer container 11, and the inner bag 12 may be peeled from the outer layer container 11 and contracted as the contents are discharged.

  The layer structure of the container body 2 will be further described. The container body 2 includes the outer layer container 11 and the inner bag 12 as described above, and the outer layer container 11 is thicker than the inner bag 12 so as to be highly recoverable. Is formed.

  The outer layer container 11 is composed of, for example, low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, an ethylene-propylene copolymer, and a mixture thereof. The outer layer container 11 has a single layer or a plurality of layers, and preferably contains a lubricant in at least one of the innermost layer and the outermost layer. When the outer layer container 11 has a single layer configuration, the single layer is the innermost layer and the outermost layer, and therefore, a lubricant may be contained in the layer. When the outer layer container 11 has a two-layer structure, the inner layer is the innermost layer and the outer layer is the outermost layer, so that at least one of them may contain a lubricant. When the outer container 11 is composed of three or more layers, the innermost layer is the innermost layer, and the outermost layer is the outermost layer. As shown in FIG. 3, the outer layer container 11 preferably includes a repro layer 11c between the innermost layer 11b and the outermost layer 11a. The repro layer refers to a layer that is used by recycling burrs generated during the molding of a container. When the outer layer container 11 has a multi-layer structure, it is preferable to contain a lubricant in both the innermost layer and the outermost layer.

  As the lubricant, those generally marketed as a lubricant can be used, and any of hydrocarbon-based, fatty acid-based, aliphatic amide-based, metal soap-based may be used, and two or more types may be used in combination. Good. Examples of the hydrocarbon lubricant include liquid paraffin, paraffin wax, and synthetic polyethylene wax. Examples of fatty acid lubricants include stearic acid and stearyl alcohol. Examples of the aliphatic amide-based lubricant include fatty acid amides of stearic acid amide, oleic acid amide, and erucic acid amide, and alkylene fatty acid amides of methylene bis stearic acid amide and ethylene bis stearic acid amide. Examples of metal soap lubricants include metal stearates.

  The innermost layer of the outer layer container 11 is a layer in contact with the inner bag 12, and the peelability between the outer layer container 11 and the inner bag 12 can be improved by containing a lubricant in the innermost layer of the outer layer container 11. On the other hand, the outermost layer of the outer layer container 11 is a layer that comes into contact with the mold during blow molding, and the release property can be improved by containing a lubricant in the outermost layer of the outer layer container 11.

  One or both of the innermost layer and the outermost layer of the outer layer container 11 can be formed of a random copolymer between propylene and another monomer. Thereby, the shape restoring property, transparency, and heat resistance of the outer container 11 that is the outer shell can be improved.

  The random copolymer has a content of monomers other than propylene of less than 50 mol%, and preferably 5 to 35 mol%. Specifically, this content is, for example, 5, 10, 15, 20, 25, 30 mol%, and may be within a range between any two of the numerical values exemplified here. The monomer copolymerized with propylene may be any monomer that improves the impact resistance of the random copolymer when compared with a polypropylene homopolymer, and ethylene is particularly preferable. In the case of a random copolymer of propylene and ethylene, the ethylene content is preferably 5 to 30 mol%, specifically, for example, 5, 10, 15, 20, 25, 30 mol%, and the numerical values exemplified here It may be within the range between any two. The weight average molecular weight of the random copolymer is preferably from 100,000 to 500,000, more preferably from 100,000 to 300,000. Specifically, the weight average molecular weight is, for example, 10, 15, 20, 25, 30, 35, 40, 45, 500,000, and is within a range between any two of the numerical values exemplified here. Also good.

  The tensile modulus of the random copolymer is preferably 400 to 1600 MPa, and preferably 1000 to 1600 MPa. This is because the shape restoring property is particularly good when the tensile elastic modulus is in such a range. Specifically, the tensile elastic modulus is, for example, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600 MPa, and between any two of the numerical values exemplified here It may be within the range.

  Note that if the container is excessively hard, the feeling of use of the container is deteriorated. Therefore, the outer layer container 11 may be configured by mixing a random copolymer with a flexible material such as linear low-density polyethylene. However, the material to be mixed with the random copolymer is preferably mixed so as to be less than 50% by weight with respect to the whole mixture so as not to significantly inhibit the effective characteristics of the random copolymer. For example, the outer layer container 11 can be made of a material obtained by mixing a random copolymer and linear low density polyethylene in a weight ratio of 85:15.

  The inner bag 12 includes an EVOH layer 13a provided on the outer surface side of the container, an inner surface layer 12b provided on the inner surface side of the EVOH layer 12a, and an adhesive layer 12c provided between the EVOH layer 12a and the inner surface layer 12b. Prepare. By providing the EVOH layer 12a, gas barrier properties and releasability from the outer layer container 11 can be improved.

  The EVOH layer 12a is a layer made of an ethylene-vinyl alcohol copolymer (EVOH) resin, and is obtained by hydrolysis of ethylene and vinyl acetate copolymer. The ethylene content of the EVOH resin is, for example, 25 to 50 mol%, and preferably 32 mol% or less from the viewpoint of oxygen barrier properties. Although the minimum of ethylene content is not prescribed | regulated, since the softness | flexibility of EVOH layer 12a tends to fall, so that ethylene content is small, 25 mol% or more is preferable. The EVOH layer 12a preferably contains an oxygen absorbent. By containing the oxygen absorbent in the EVOH layer 12a, the oxygen barrier property of the EVOH layer 12a can be further improved.

  The melting point of the EVOH resin is preferably higher than the melting point of the random copolymer constituting the outer layer container 11. The outside air introduction hole 15 is preferably formed in the outer layer container 11 using a heating type punching device, but the outside air introduction hole 15 is formed in the outer layer container 11 by making the melting point of the EVOH resin higher than the melting point of the random copolymer. When forming 15, the hole is prevented from reaching the inner bag 13. From this point of view, the difference between (the melting point of EVOH) − (the melting point of the random copolymer layer) should be large, preferably 15 ° C. or higher, and particularly preferably 30 ° C. or higher. The difference in melting point is, for example, 5 to 50 ° C., specifically, for example, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 ° C., and any of the numerical values exemplified here. Or within a range between the two.

  The inner surface layer 12b is a layer that comes into contact with the contents of the double container 1, for example, a polyolefin such as a low density polyethylene, a linear low density polyethylene, a high density polyethylene, a polypropylene, an ethylene-propylene copolymer, and a mixture thereof. It is preferably made of low-density polyethylene or linear low-density polyethylene. 50-300 MPa is preferable and, as for the tensile elasticity modulus of resin which comprises the inner surface layer 12b, 70-200 MPa is preferable. This is because the inner surface layer 13b is particularly flexible when the tensile elastic modulus is in such a range. The tensile modulus is specifically, for example, specifically, for example, 50, 100, 150, 200, 250, 300 MPa, and may be within a range between any two of the numerical values exemplified here. .

  The adhesive layer 12c is a layer having a function of adhering the EVOH layer 12a and the inner surface layer 12b. For example, an acid-modified polyolefin in which a carboxyl group is introduced into the above-described polyolefin (eg, maleic anhydride-modified polyethylene) is added. And ethylene vinyl acetate copolymer (EVA). An example of the adhesive layer 12c is a mixture of low-density polyethylene or linear low-density polyethylene and acid-modified polyethylene.

  Further, in the shoulder portion of the accommodating portion 3, a concave portion 7 a is formed in the outer layer container 11, and an air introduction hole 15 is drilled therein. The air introduction hole 15 is a through hole provided only in the outer layer container 11 and does not reach the inner bag 12. Then, by introducing air from the air introduction hole 15, an intermediate space 21 is formed between the outer layer container 11 that is the outer shell and the inner bag 12. That is, the intermediate space 21 and the external space are communicated with each other through the atmospheric air introduction hole 15.

  A valve member 5 is provided in the air introduction hole 15. The valve member 5 is inserted between the outside air introduction hole 15 and is slidable with respect to the outside air introduction hole 15. A lid portion 5c that is provided on the space 21 side and has a larger cross-sectional area than the shaft portion 5a, and a locking portion 5b that is provided on the outer space S side of the shaft portion 5a and prevents the valve member 5 from entering the intermediate space 21. Prepare.

  The lid portion 5c is configured to substantially close the outside air introduction hole 15 when the outer layer container 11 is compressed, and has a shape in which the cross-sectional area decreases as the shaft portion 5a is approached. Moreover, the latching | locking part 5b is comprised so that air can be introduce | transduced into the intermediate | middle space 21, when decompress | restoring after the outer layer container 11 is compressed. When the outer layer container 11 is compressed, the pressure in the intermediate space 21 becomes higher than the external pressure, and the air in the intermediate space 21 leaks out from the outside air introduction hole 15. The lid 5c moves toward the outside air introduction hole 15 due to the pressure difference and the air flow, and the lid 5c closes the outside air introduction hole 15. Since the cross-sectional area becomes smaller as the lid portion 5 c approaches the shaft portion 5 a, the lid portion 5 c easily fits into the outside air introduction hole 15 and closes the outside air introduction hole 15.

  When the outer layer container 11 is further compressed in this state, the pressure in the intermediate space 21 increases, and as a result, the inner bag 12 is compressed and the contents in the inner bag 12 are discharged. In addition, when the compressive force applied to the outer layer container 11 is released, the outer layer container 11 attempts to recover by its own elasticity. At this time, the lid portion 5 c is separated from the outside air introduction hole 15, the outside air introduction hole 15 is released from being blocked, and outside air is introduced into the intermediate space 21. Further, in order to prevent the locking portion 5b from blocking the outside air introduction hole 15, the locking portion 5b is provided with a protrusion 5d at a portion that contacts the outer layer 11, and the protrusion 5d contacts the outer layer container 11. Thus, a gap is provided between the outer layer container 11 and the locking portion 5b. Instead of providing the protrusion 5d, a groove may be provided in the locking portion 5b to prevent the locking portion 5b from closing the outside air introduction hole 15.

  Next, the operation | movement at the time of use of the double container 1 which has the non-return valve 5 is demonstrated.

  As shown in FIGS. 4 (a) to 4 (c), the product filled with the contents is tilted and the side surface of the outer container 11 is gripped and compressed to discharge the contents. At the start of use, since there is substantially no gap between the inner bag 12 and the outer layer container 11, the compressive force applied to the outer layer container 11 directly becomes the compressive force of the inner bag 12, and the inner bag 12 is compressed. The contents are discharged.

  The cap 30 incorporates a check valve and can discharge the contents in the inner bag 12, but the outside air does not flow back into the inner bag 12. Therefore, when the compressive force applied to the outer layer container 11 after discharging the contents is removed, the outer layer container 11 tries to return to its original shape by its own restoring force, but the inner bag 12 remains deflated and only the outer layer container 11 remains. Will expand. Then, as shown in FIG. 4D, the inside of the intermediate space 21 between the inner bag 12 and the outer layer container 11 is in a reduced pressure state, and outside air is introduced into the intermediate space 21 through the outside air introduction hole 15 formed in the outer layer container 11. be introduced. When the intermediate space 21 is in a depressurized state, the valve member 5 is not pressed against the air introduction hole 15, so that the introduction of outside air is not hindered.

  Next, as shown in FIG. 4 (e), when the outer container 11 is again gripped and compressed, the pressure in the intermediate space 21 is caused by the valve member 5 coming into contact with the air introduction hole 15 and closing. The compression force applied to the outer container 11 is transmitted to the inner bag 12 through the intermediate space 21, and the inner bag 12 is compressed by this force and the contents are discharged. When the compressive force applied to the outer layer container 11 after discharging the contents is removed, as shown in FIG. 4 (f), the outer layer container 11 introduces outside air from the outside air introduction hole 15 into the intermediate space 21, The original shape is restored by the restoring force.

  The configuration of the container main body 2 is as described above. In the container main body 2, a male screw portion is provided in the mouth portion 4, and a cap 30 having a female screw is attached to the male screw portion. Hereinafter, the configuration of the attachment portion of the cap 30 will be described in detail.

  The cap 30 is attached to the mouth portion 4 of the container body 2, and as shown in FIG. 5, an inner cap 31 fixed directly to the mouth portion 4 of the container body 2 and an outer peripheral surface of the inner cap 31. A cap body 32 screwed to the provided male screw portion 31a, a check valve 33, a nozzle portion 34 having a spout, and a lid (not shown) that covers the spout via a hinge or the like Consists of

  The inner cap 31 is attached to the mouth portion 4 of the container body 2 by screwing or stoppering, and has a top plate portion 31b that covers the mouth portion 4, and a central portion of the top plate portion 31b. Is provided with a circular hole 31c. The inner peripheral surface of the circular hole 31c is an inclined surface that increases in diameter upward corresponding to the conical shape of the peripheral surface of the protrusion provided on the inner plug member of the cap body 32. .

  A seal member 40 is interposed between the top plate portion 31 b of the inner cap 31 and the front end surface of the mouth portion 4 of the container body 2, and the mouth portion 4 of the container body 2 is sealed by the seal member 40. It is in a state. For example, the sealing member 40 is attached to the lower surface of the top plate portion 31b of the inner cap 31 in advance, and the mouth portion is applied by applying ultrasonic waves while the inner cap 31 is attached to the mouth portion 4 of the container body 2. 4 is fixed. Of course, the present invention is not limited to this, and the sealing member 40 can be fixed to the mouth portion 4 by a technique such as high frequency sealing.

  The sealing member 40 seals the double container 1 filled with the contents and seals the mouth 4 in order to improve the storage stability. On the other hand, it is necessary to form with the material which has barrier property. Therefore, the seal member 40 is preferably formed of aluminum or the like.

  In this embodiment, the sealing member 40 has a three-layer structure in which a polypropylene layer, an aluminum layer, and a polypropylene layer are laminated in this order. By making the sealing member 40 into a three-layer structure, it is possible to seal the mouth 4 of the container body 2 by ultrasonic welding or the like.

  The cap body 32 has a female threaded portion 32 a on the inner peripheral surface, and is fixed by screwing it into a male threaded portion 31 a formed on the outer peripheral surface of the inner cap 31. Further, the cap main body 32 is formed with an inner plug member 41 at a position above the inner cap 31 so as to block the flow path, and a protruding portion 42 is formed at the center thereof.

  The projecting portion 42 is formed so as to project toward the seal member (downward), the tip of the projecting portion 42 has a pointed shape (conical shape), and penetrates from the midway position to the outlet side of the inner plug member. A content passage 42a is formed. FIG. 6 is a plan view (and therefore a bottom view) of the protruding portion 42 as viewed from below. In this example, the protruding portion 42 is opened at two locations on the conical circumferential surface between the distal end 42b and the proximal end portion. An opening 42c of the content passage 42a is formed.

  Further, the content flow passage 42a formed in the protruding portion 42 penetrates to the outflow side of the inner plug member 41, but the valve 33a of the check valve 33 contacts the outflow side opening 42d. It is designed to be opened and closed.

  Further, a nozzle part 34 having a spout 34a covering the check valve 33 is attached to the content outflow side of the cap body 32, and the content is taken out from the spout 34a. A hinge cap is attached to cover the spout 34a of the nozzle portion 34, but the illustration is omitted here.

  In the cap mounting portion having the above configuration, during storage, as shown in FIG. 5, the mouth portion 4 of the container body 2 is sealed by the seal member 40 and is kept in a hermetically sealed state. Is minimized.

  On the other hand, at the time of opening, the cap main body 32 is screwed, the protrusion 42 formed at the center of the inner plug member 41 is advanced toward the seal member 40, and the seal member 40 is pierced at the tip thereof to open the seal. Accordingly, when the cap body 32 is stored, the cap body 32 is screwed to a position where the tip of the protruding portion 42 does not hit the seal member 40 with respect to the inner cap 31, and is further screwed when opening to enable the opening operation. Keep it. Therefore, for example, during storage, a stopper member or the like is provided on the male screw portion 31a of the inner cap 31 so that the screwing of the cap body 32 remains at a position where the tip of the protruding portion 42 does not hit the seal member 40. It is preferable. If it does in this way, the cap main body 32 will not be screwed at the time of a preservation | save, and it will not be opened carelessly. In use, the stopper member may be removed and the cap body 32 may be screwed.

  FIG. 7 is a view showing an opened state of the seal member 40. At the time of opening, the sealing member 40 is pierced by the protruding portion 42 provided on the inner plug member 41 by the tip portion and opened. At this time, the tip of the projecting portion 42 has a pointed shape (conical shape), and the opening 42c of the content flow path 42a is located in the middle of the outer peripheral surface of the projecting portion 42. The cut piece does not inadvertently block the opening 42c, and the flow path is reliably ensured.

  Further, in a state where the sealing member 40 is opened by the protruding portion 42, the conical outer peripheral surface of the protruding portion 42 is in contact with the inner peripheral surface of the hole 31 c of the inner cap 31. If the diameter of the base end portion of the protruding portion 42 is set larger than the maximum diameter of the hole 31c of the inner cap 31, the forming accuracy of the diameter of the protruding portion 42 and the diameter of the hole 31c of the inner cap 31 is insufficient. However, the conical outer peripheral surface of the protruding portion 42 can be reliably brought into contact with the opening edge of the hole 31c of the inner cap 31, and the sealing performance of this portion can be maintained. In a double container, it is often required to avoid backflow of air into the container as much as possible, and it is extremely important to ensure hermeticity at a place other than the opened part even after opening.

  When the seal member 40 is opened, the mouth 4 of the container body 2 can communicate with the outside through the content flow path 42a provided in the protrusion 42 and the spout 34a of the nozzle 34. It becomes possible to pour out things. For example, when the outer layer container 11 is compressed, the internal pressure of the container body 2 increases, and the valve 33a of the check valve 33 that is in contact with the opening 42c of the content flow path 42a is separated from the opening 42c, and the content flow path 42a. The opening 42c is opened. As a result, the content passes through the content passage 42 a of the protruding portion 42 that has broken through the seal 40, and is poured out from the spout 34 a of the nozzle portion 34. When the compression of the outer container 11 is released, the internal pressure of the container body 2 is lowered, and the valve 33a of the check valve 33 is brought into contact with the opening 42c of the content flow path 42a to be in a sealed state.

  As mentioned above, although embodiment which applied this invention has been described, this invention is not limited to this embodiment, and it cannot be overemphasized that a various change is possible in the range which does not deviate from the summary of this invention. .

DESCRIPTION OF SYMBOLS 1 Double container 2 Container main body 3 Storage part 4 Mouth part 5 Valve member 11 Outer container 12 Inner bag 15 Outside air introduction hole 30 Cap 31 Inner cap 31c Hole 32 Cap main body 33 Check valve 33a Valve 40 Seal member 41 Middle plug member 42 Protruding part 42a Contents channel 43 Nozzle part 43a Outlet

Claims (4)

A double container having an outer layer container and an inner bag, wherein the inner bag peels off from the outer layer container and shrinks as the contents contained in the inner bag decrease,
The mouth is sealed with a seal member, and a cap having a check valve is attached to the mouth.
The cap has an inner plug member having a protruding portion formed to protrude toward the seal member,
The protrusion has a tip-shaped tip, and a content passage that penetrates from the midway position to the outflow side of the inner plug member is formed.
By screwing the cap, the protruding portion of the inner plug member pierces the seal portion and is opened. The seal member is fixed in a state where the periphery is sandwiched between the mouth portion and the inner cap,
The inner cap has a hole formed at a position facing the protruding portion, and when the cap is screwed, the peripheral surface of the tip-shaped protruding portion abuts on the peripheral edge of the hole portion of the inner cap. The double container according to claim 1.   The double container according to claim 1 or 2, wherein the check valve opens and closes an opening on the outflow side of the content passage formed in the protruding portion.   The double container according to any one of claims 1 to 3, wherein the sealing member is a multilayer film in which a polypropylene layer, an aluminum layer, and a polypropylene layer are laminated in this order.

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