JP6775132B2 - Double container - Google Patents

Description

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

Conventionally, the air between the container body having the outer layer container and the inner bag and the inner bag shrinking as the contents decrease, the intermediate space between the outer layer container and the inner bag, and the outer space of the container body. A double container (so-called laminated peeling container) provided with a check valve for adjusting the entry / exit is known (see, for example, Patent Documents 1 and 2).

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

Further, the laminated peeling container has an advantage that the contents in the inner bag do not come into contact with air, and therefore, after pouring out the contents, the contents are checked back to the cap so that the air does not flow back into the inner bag. A valve is also provided, and it has also been proposed to seal the mouth with aluminum in order to ensure airtightness during storage (see, for example, Patent Document 3).

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

Japanese Unexamined Patent Publication No. 2013-35557 Japanese Unexamined Patent Publication No. 4-267727 Japanese Unexamined Patent Publication No. 7-112749

By the way, closing with a sealing material as described in Patent Document 3 is an effective means in terms of ensuring storage stability, but the opening is opened with a tubular cutting blade as described in Patent Document 3. If this is done, various inconveniences may occur. For example, after cutting, debris of the sealing material may adhere to the cutting blade as it is and block the flow path. Further, when the sealing material is opened with a tubular cutting blade, it is difficult to maintain the airtightness. In order to maintain the airtightness 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, but for that purpose, it is necessary to improve the molding accuracy of the cutting blade, which leads to an increase in cost. ..

The present invention has been made in view of such conventional circumstances, and can maintain airtightness during storage, eliminate inconveniences during opening, and maintain airtightness even after opening. It is intended to provide a double container capable of providing.

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 off from the outer layer container as the contents contained in the inner bag decrease. A double container that contracts, the mouth of which is sealed with a sealing member, and a cap having a check valve is attached to the mouth, and the cap is a protruding portion formed so as to project toward the sealing member. The protruding portion has a pointed tip, and a content passage is formed from the middle position of the inner plug member to the outflow side of the inner plug member, and the cap is screwed into the inner plug member. , the projecting portion of the inside plug member breaks through the sealing member, is opened, the sealing member is fixed in a state where the ambient is sandwiched inner cap and the mouth portion, the inner cap is opposed to the projecting portion A hole is formed at the position where the cap is formed, and when the cap is screwed in, the peripheral surface of the pointed protruding portion abuts on the peripheral edge of the hole of the inner cap.

By sealing the mouth with a sealing member, the airtightness during storage is ensured. In addition, the seal member is opened by a protruding portion having a pointed tip and a content passage penetrating from the middle position to the outflow side of the inner plug member, so that the flow path is blocked due to the adhesion of debris. The obstacle is suppressed.

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

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

Hereinafter, embodiments 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 laminated peeling container, which is mainly composed of a container body 2, and the container body 2 includes an accommodating portion 3 for accommodating contents. It is provided with a port 4 for discharging the contents from the accommodating portion 3. Further, as shown in FIG. 2, the container body 2 includes an outer layer container 11 and an inner bag 12 which are outer shells in the accommodating portion 3 and the mouth portion 4, and the inner bag 12 becomes larger as the contents decrease. 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 off from the outer layer container 11 in advance before use. The contents are filled until the inner bag 12 comes into contact with the outer layer container 11. By pushing out the contents, the inner bag 12 contracts smoothly. Alternatively, the inner bag 12 may be left joined to the outer layer container 11 so that the inner bag 12 peels off from the outer layer container 11 and contracts as the contents are discharged.

To further explain the layer structure of the container body 2, 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 have high resilience. Is formed in.

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 it is preferable that at least one of the innermost layer and the outermost layer contains a lubricant. When the outer layer container 11 has a single layer structure, the single layer is the innermost layer and the outermost layer, so that the layer may contain a lubricant. When the outer layer container 11 has a two-layer structure, the layer on the inner surface side of the container is the innermost layer, and the layer on the outer surface side of the container is the outermost layer. Therefore, at least one of them may contain a lubricant. When the outer layer container 11 is composed of three or more layers, the layer on the innermost surface side of the container is the innermost layer, and the layer on the outermost surface side of the container 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 is a layer made by recycling burrs generated during molding of a container. When the outer layer container 11 has a plurality of layers, it is preferable that both the innermost layer and the outermost layer contain a lubricant.

As the lubricant, a commercially available lubricant can be generally used, and any of hydrocarbon-based, fatty acid-based, aliphatic amide-based, and metal soap-based lubricants may be used, and two or more of them may be used in combination. Good. Examples of the hydrocarbon-based lubricant include liquid paraffin, paraffin wax, and synthetic polyethylene wax. Examples of the fatty acid-based lubricant include stearic acid and stearyl alcohol. Examples of the aliphatic amide lubricant include fatty acid amides of stearic acid amide, oleic acid amide and erucic acid amide, methylene bisstearic acid amide and alkylene fatty acid amide of ethylene bisstearic acid amide. Examples of the metal soap-based lubricant include a metal stearic acid salt and the like.

The innermost layer of the outer layer container 11 is a layer in contact with the inner bag 12, and by incorporating a lubricant in the innermost layer of the outer layer container 11, the peelability between the outer layer container 11 and the inner bag 12 can be improved. 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 mold releasability can be improved by incorporating 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 restoration property, transparency, and heat resistance of the outer layer container 11 which is the outer shell can be improved.

The content of the monomer other than propylene in the random copolymer is smaller than 50 mol%, preferably 5 to 35 mol%. Specifically, this content is, for example, 5, 10, 15, 20, 25, 30 mol%, and may be in the range between any two of the numerical values exemplified here. As the monomer copolymerized with propylene, ethylene is particularly preferable as long as it improves the impact resistance of the random copolymer as compared with the homopolymer of polypropylene. 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 of. The weight average molecular weight of the random copolymer is preferably 100,000 to 500,000, more preferably 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 the range between any two of the numerical values exemplified here. May be good.

The tensile elastic modulus of the random copolymer is preferably 400 to 1600 MPa, preferably 1000 to 1600 MPa. This is because the shape restoration 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 is between any two of the numerical values exemplified here. It may be within the range of.

If the container is excessively hard, the usability of the container deteriorates. Therefore, a flexible material such as linear low-density polyethylene may be mixed with the random copolymer to form the outer layer container 11. 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 entire mixture so as not to significantly impair the effective properties of the random copolymer. For example, the outer layer container 11 can be made of a material in which a random copolymer and a linear low-density polyethylene are mixed at 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 container of the EVOH layer 12a, and an adhesive layer 12c provided between the EVOH layer 12a and the inner surface layer 12b. Be prepared. By providing the EVOH layer 12a, the gas barrier property and the peelability 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 an ethylene-vinyl acetate copolymer. The ethylene content of the EVOH resin is, for example, 25 to 50 mol%, preferably 32 mol% or less from the viewpoint of oxygen barrier property. The lower limit of the ethylene content is not particularly specified, but 25 mol% or more is preferable because the flexibility of the EVOH layer 12a tends to decrease as the ethylene content decreases. Further, the EVOH layer 12a preferably contains an oxygen absorber. By containing the oxygen absorber 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 by using a heating type drilling device, but by making the melting point of the EVOH resin higher than the melting point of the random copolymer, the outside air introduction hole 15 is formed in the outer layer container 11. When forming 15, the hole is prevented from reaching the inner bag 13. From this point of view, the difference between (melting point of EVOH)-(melting point of random copolymer layer) is preferably large, preferably 15 ° C. or higher, and particularly preferably 30 ° C. or higher. This 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. It may be within the range between the two.

The inner surface layer 12b is a layer that comes into contact with the contents of the double container 1, and is, for example, a polyolefin such as low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, ethylene-propylene copolymer and a mixture thereof. It is preferably made of low density polyethylene or linear low density polyethylene. The tensile elastic modulus of the resin constituting the inner surface layer 12b is preferably 50 to 300 MPa, preferably 70 to 200 MPa. This is because the inner surface layer 13b is particularly flexible when the tensile elastic modulus is in such a range. The tensile elastic modulus is, for example, specifically, for example, 50, 100, 150, 200, 250, 300 Mpa, and may be in the 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-mentioned polyolefin (eg, maleic anhydride-modified polyethylene) is added. , 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 recess 7a is formed in the outer layer container 11, and an atmosphere introduction hole 15 is formed 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 and the inner bag 12, which are the outer shells. That is, the intermediate space 21 and the external space are communicated with each other by the atmosphere introduction hole 15.

A valve member 5 is provided in the air introduction hole 15, and the valve member 5 is inserted between the shaft portion 5a and the shaft portion 5a which is inserted into the outside air introduction hole 15 and can be slidably moved with respect to the outside air introduction hole 15. A lid portion 5c provided on the space 21 side and having a larger cross-sectional area than the shaft portion 5a, and a locking portion 5b provided on the outer space S side of the shaft portion 5a and preventing the valve member 5 from entering the intermediate space 21. Be prepared.

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 becomes smaller as it approaches the shaft portion 5a. Further, the locking portion 5b is configured so that air can be introduced into the intermediate space 21 when the outer layer container 11 is restored after being 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 to the outside from the outside air introduction hole 15. Due to this pressure difference and the air flow, the lid portion 5c moves toward the outside air introduction hole 15, and the lid portion 5c closes the outside air introduction hole 15. Since the lid portion 5c has a shape in which the cross-sectional area decreases as it approaches the shaft portion 5a, the lid portion 5c 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. Further, when the compressive force on the outer layer container 11 is released, the outer layer container 11 tries to be restored by its own elasticity. At this time, the lid portion 5c is separated from the outside air introduction hole 15, the blockage of the outside air introduction hole 15 is released, and the outside air is introduced into the intermediate space 21. Further, the locking portion 5b is provided with a protrusion 5d at a portion that abuts on the outer layer 11 so that the locking portion 5b does not block the outside air introduction hole 15, and the protrusion 5d abuts on the outer layer container 11. 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 blocking the outside air introduction hole 15.

Next, the operation when the double container 1 having the check valve 5 is used will be described.

As shown in FIGS. 4A to 4C, the product filled with the contents is tilted and the side surface of the outer layer container 11 is grasped and compressed to discharge the contents. At the start of use, there is substantially no gap between the inner bag 12 and the outer layer container 11, so that the compressive force applied to the outer layer container 11 becomes the compressive force of the inner bag 12 as it is, and the inner bag 12 is compressed. And the contents are discharged.

The cap 30 has a built-in 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 deflated. It 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 decompressed state, and the outside air enters 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 the decompressed state, the valve member 5 is not pressed against the atmosphere introduction hole 15, so that the introduction of outside air is not hindered.

Next, as shown in FIG. 4 (e), when the side surface of the outer layer container 11 is gripped and compressed again, the valve member 5 abuts on the atmosphere introduction hole 15 and closes, so that the pressure in the intermediate space 21 is increased. Is increased, and the compressive force applied to the outer layer container 11 is transmitted to the inner bag 12 via the intermediate space 21, and this force compresses the inner bag 12 and discharges the contents. Excluding the compressive force applied to the outer layer container 11 after discharging the contents, as shown in FIG. 4 (f), the outer layer container 11 introduces the outside air from the outside air introduction hole 15 into the intermediate space 21 while introducing its own outside air. It is restored to its original shape by the restoring force.

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

The cap 30 is attached to the mouth 4 of the container body 2, and as shown in FIG. 5, the cap 30 is attached to the inner cap 31 directly fixed to the mouth 4 of the container body 2 and the 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 portion (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 tapping, and has a top plate portion 31b that covers the mouth portion 4, and is 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 whose diameter increases 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 sealing member 40 is interposed between the top plate portion 31b of the inner cap 31 and the tip 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 sealing member 40. It is in a state. For example, the seal member 40 is attached to the lower surface of the top plate portion 31b of the inner cap 31 in advance, and the inner cap 31 is attached to the mouth portion 4 of the container body 2 and ultrasonic waves are applied to the mouth portion. It is fixed to 4. Of course, the present invention is not limited to this, and the seal member 40 can be fixed to the mouth portion 4 by a method such as a high frequency seal.

The sealing member 40 seals the double container 1 filled with the contents and seals the mouth portion 4 in order to improve the storage stability, and is suitable for outside air such as gas barrier property and water vapor barrier property. On the other hand, it is necessary to form a material having a barrier property. Therefore, the seal member 40 is preferably made of aluminum or the like.

In the present 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 forming the sealing member 40 into a three-layer structure, it is possible to seal the mouth portion 4 of the container body 2 by ultrasonic welding or the like of the sealing member 40.

The cap body 32 has a female screw portion 32a on the inner peripheral surface, and is fixed by screwing this into the male screw portion 31a formed on the outer peripheral surface of the inner cap 31. Further, the cap body 32 is formed with an inner plug member 41 formed 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 protruding portion 42 is formed to protrude toward the seal member (downward), and its tip has a pointed shape (conical shape) and penetrates from the intermediate position to the outflow side of the inner plug member. A content passage 42a is formed. FIG. 6 is a plan view (hence, bottom view) of the protruding portion 42 as viewed from below. In the case of this example, the protruding portion 42 is opened at two points on the conical peripheral surface between the tip end 42b and the base end portion. An opening 42c of the content passage 42a is formed.

Further, the content flow path 42a formed in the protruding portion 42 penetrates the outflow side of the inner plug member 41, and the valve 33a of the check valve 33 comes into contact with the opening 42d on the outflow side. , It is designed to be opened and closed.

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

In the cap attachment portion having the above configuration, at the time of storage, as shown in FIG. 5, the mouth portion 4 of the container body 2 is sealed by the sealing member 40 and the sealed state is maintained, so that the contents are deteriorated, etc. Is minimized.

On the other hand, at the time of opening, the cap body 32 is screwed in, the protruding portion 42 formed in the central portion of the inner plug member 41 is advanced toward the seal member 40, and the seal member 40 is pierced by the tip thereof to open the seal. Therefore, the cap body 32 is screwed into the inner cap 31 until the tip of the protruding portion 42 does not abut against the seal member 40 at the time of storage, and is further screwed at the time of opening so that the opening operation can be performed. Keep it. Therefore, for example, a stopper member or the like is provided on the male screw portion 31a of the inner cap 31 so that the screw of the cap main body 32 stays at a position where the tip of the protruding portion 42 does not abut on the seal member 40 during storage. Is preferable. By doing so, the cap body 32 is not screwed in during storage, and the cap body 32 is not inadvertently opened. At the time of use, the stopper member may be removed and the cap body 32 may be screwed in.

FIG. 7 is a diagram showing an opened state of the seal member 40. At the time of opening, the seal member 40 is pierced by the tip portion through the protruding portion 42 provided in the inner plug member 41 and is opened. At this time, since the tip of the protruding 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 protruding portion 42, the seal member 40 The flow path is surely secured without the cut piece inadvertently blocking the opening 42c.

Further, in a state where the seal 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 31c of the inner cap 31. If the diameter of the base end portion of the protruding portion 42 is set to be larger than the maximum diameter of the hole 31c of the inner cap 31, the molding accuracy of the diameter of the protruding portion 42 and the diameter of the hole 31c of the inner cap 31 is insufficient. Even so, the conical outer peripheral surface of the protruding portion 42 can be surely brought into contact with the opening edge of the hole 31c of the inner cap 31, and the airtightness 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 airtightness in a place other than the opened portion even after opening.

In the state where the seal member 40 is opened, the opening portion 4 of the container body 2 is in a state of being able to communicate with the outside through the content flow path 42a provided in the protruding portion 42 and the spout 34a of the nozzle portion 34. It becomes possible to dispense things. For example, when the outer layer container 11 is compressed, the internal pressure of the container body 2 rises, 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 of the is opened. As a result, the contents are discharged to the outside from the injection port 34a of the nozzle portion 34 through the content passage 42a of the protruding portion 42 that has penetrated the seal 40. When the compression of the outer layer container 11 is released, the internal pressure of the container body 2 drops, and the valve 33a of the check valve 33 comes into contact with the opening 42c of the content flow path 42a, resulting in a sealed state.

Although the embodiment to which the present invention is applied has been described above, it goes without saying that the present invention is not limited to this embodiment and various modifications can be made without departing from the gist of the present invention. ..

1 Double container 2 Container body 3 Storage part 4 Port 5 Valve member 11 Outer layer container 12 Inner bag 15 Outside air introduction hole 30 Cap 31 Inner cap 31c Hole 32 Cap body 33 Check valve 33a Valve 40 Seal member 41 Inner plug member 42 Projection 42a Contents flow path 43 Nozzle 43a Injection / outlet

Claims (3)

A double container having an outer layer container and an inner bag, and 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 sealing member, and a cap with a check valve is attached to the mouth.
The cap has an inner plug member having a protrusion formed so as to protrude toward the seal member.
The tip of the protruding portion has a pointed shape, and a content passage penetrating from the intermediate position to the outflow side of the inner plug member is formed.
By screwing the cap, the protruding portion of the inner plug member breaks through the seal member and is opened.
The sealing member is fixed with its periphery sandwiched between the mouth and the inner cap.
A hole is formed in the inner cap at a position facing the protruding portion, and when the cap is screwed, the peripheral surface of the pointed protruding portion abuts on the peripheral edge of the hole of the inner cap. A double container featuring. The double container according to claim 1, 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 claim 1 or 2, 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.

Images