Barrier member, container, and method for manufacturing the container

Abstract

Provided is a barrier member that makes it easy to achieve higher barrier properties in a container. [Solution] A barrier member is provided inside a container body having a canopy portion with an opening provided at the front side of a cylindrical body portion so as to cover the opening, the barrier member having a canopy corresponding portion that covers the inner wall of the canopy portion, and an extension portion that extends rearward from the outer periphery of the canopy corresponding portion and covers the vicinity of the front end of the inner wall of the body portion.

Description

[Technical field]

[0001] The present invention relates to a barrier member, a container using the same, and a method for manufacturing the container. [Background technology]

[0002] Conventionally, containers for storing caulking materials, adhesives, etc., have been used that have a canopy with an opening at the end of a cylindrical body. In such containers, a membrane (a film-like body that closes the opening of the canopy) that functions as a barrier member is often provided on the inside to maintain the quality of the contents. For example, Patent Documents 1 to 3 disclose cartridges that are formed so that the contents can be pushed out by a plunger and that have a membrane.

[0003] By providing a membrane, the opening can be sealed when the container is unopened to maintain the quality of the contents, while when used, the opening can be opened by breaking the membrane to release the contents. In particular, caulking materials, adhesives, etc. tend to harden or deteriorate when exposed to moisture or air, so it is very important to completely seal the opening with a membrane to ensure barrier properties (the ability to prevent the intrusion of gases, moisture, etc.). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4665951 [Patent Document 2] Patent No. 4919563 [Patent Document 3] Special Publication No. 2015-500776 Summary of the Invention [Problem to be solved by the invention]

[0005] In order to ensure the barrier properties of a container using a membrane, it is effective to ensure that the area covered by the membrane is sufficient. However, in conventional containers, the area covered by the membrane is limited to the inner wall of the canopy, and when a relatively high barrier property is required, this type of area may result in insufficient barrier property.

[0006] In view of the above-mentioned problems, the present invention has an object to provide a barrier member that makes it easier to obtain higher barrier properties in a container, a container using the same, and a method for manufacturing a container. [Means for solving the problem]

[0007] The barrier member of the present invention is a barrier member that is arranged inside a container body having a canopy portion with an opening disposed at the front side of a cylindrical body portion so as to cover the opening, and is configured to have a canopy corresponding portion that covers the inner wall of the canopy portion, and an extension portion that extends rearward from the outer periphery of the canopy corresponding portion and covers the vicinity of the front end of the inner wall of the body portion.

[0008] According to this configuration, it is easy to obtain higher barrier properties in the container. Note that the front-rear direction here is merely determined for the sake of convenience so as to coincide with the axial direction of the cylindrical body portion, and the side on which the canopy is provided as viewed from the body portion is defined as the front side.

[0009] In addition, in the barrier member having the above-mentioned configuration in which a portion near the outer periphery of a flat membrane is bent backward, the extension portion may be formed by the portion near the outer periphery, and the canopy-corresponding portion may be formed by an inner portion of the portion near the outer periphery. With this configuration, it is possible to easily form the barrier member using the membrane.

[0010] The container according to the present invention may further comprise a barrier member and a container body having the above-described configuration, the canopy-corresponding portion and the extension portion being fixed to the container body. In addition, the container for containing a fluid may be configured such that a plunger is movably provided to close the rear side of the container body, and after the barrier member is broken to open the opening, the fluid is released through the opening by being pushed out by the plunger.

[0011] In addition, the manufacturing method according to the present invention is a manufacturing method in which the fixing is achieved by fusion through heating.

[0012] More specifically, the manufacturing method may be such that one or more protrusions are provided on the inner wall of the canopy, and the heating is performed while the barrier member is pressed against the protrusions. With this method, it is possible to achieve particularly reliable and sufficient fusion at the protrusions.

[0013] More specifically, the above manufacturing method may be a manufacturing method in which the protrusion is formed in a ring shape surrounding the opening. According to this method, by achieving reliable fusion at least at the protrusion, the container body can be reliably sealed. More specifically, the above manufacturing method may be a manufacturing method in which the canopy and the body are integrally molded from resin to form the container body.

[0014] More specifically, the barrier member may have a conductive layer, and the heating may be electromagnetic induction heating in which a current is passed through the conductive layer. This method can heat the entire barrier member uniformly and efficiently, while minimizing deformation and deterioration of the container body. Effect of the Invention

[0015] The barrier member according to the present invention makes it easy to obtain higher barrier properties in a container. Furthermore, the container and the method for manufacturing a container according to the present invention make it possible to enjoy the advantages of the barrier member according to the present invention. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a configuration diagram of a cartridge-type container CT according to the present embodiment. [Diagram 2] FIG. 2 is an explanatory diagram showing a sample example of a cartridge-type container CT. [Diagram 3] FIG. 2 is an explanatory diagram showing a sample example of the membrane 2 according to the present embodiment. [Figure 4] 1A to 1C are explanatory diagrams relating to a manufacturing method of the cartridge-type container CT. [Diagram 5] FIG. 2 is a configuration diagram of a container body 1 according to the present embodiment as viewed from the rear. [Figure 6] 1A to 1C are explanatory diagrams relating to a manufacturing method of the cartridge-type container CT. [Figure 7] 1A to 1C are explanatory diagrams relating to a manufacturing method of the cartridge-type container CT. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this application, unless otherwise specified, the front-rear direction corresponds to the axial direction of the cylindrical body, and the side where the canopy is provided is defined as the front side as viewed from the body.

[0018] 1. Structure of the cartridge-type container FIG. 1 is a schematic diagram of the cartridge-type container CT according to this embodiment. FIG. 1 (as well as FIG. 4, FIG. 6, and FIG. 7 described later) is shown as a cross-sectional view taken along a plane passing through the central axis of a body portion 11 formed in a cylindrical shape. Also, FIG. 1 omits the illustration of a convex portion 12a1 described later. FIG. 2 shows the periphery of a membrane 2 in a cut example of a sample of the cartridge-type container CT. As shown in these figures, the cartridge-type container CT is formed using a container body 1, a membrane 2 (one form of the barrier member according to the present invention), a plunger 3, and a barrier film 4, and is used as a container for containing a fluid (content) such as a caulking material or an adhesive.

[0019] The container body 1 is configured such that a canopy 12 having an opening OP is provided at the front side of a cylindrical body 11. In the container body 1, the canopy 12 and the body 11 are integrally molded from resin, and the canopy 12 and the body 11 are seamlessly connected. Polyethylene or the like is suitable as the resin from which the container body 1 is formed. For example, the size of the container body 1 that holds about 330 ml of contents is set to a total length of about 200 mm, an outer diameter of about 50 mm, and a thickness of about 1 mm.

[0020] The canopy 12 is the portion of the container body 1 excluding the body 11 (the portion to the left of the broken line α in FIG. 1), and is configured with a nozzle 12b protruding forward from the center front side of the disk-shaped portion 12a, whose axial direction is the front-rear direction. An opening OP extending in the front-rear direction is formed in the center of the disk-shaped portion 12a and the nozzle portion 12b as viewed from the front, and connects the inside of the container body 1 to the outside when the membrane 2 is broken. The radial dimension of the opening OP is sufficiently smaller than the inner diameter of the body 11. The rear surface of the disk-shaped portion 12a is a plane with the front-rear direction as its normal line.

[0021] The membrane 2 is a thin film-like member provided inside the container body 1 so as to close the opening OP, and is formed by laminating, for example, a polyethylene terephthalate (PET) film, a polypropylene (PP) film, an aluminum foil, a polyethylene (PE) film, etc. In the membrane 2, at least the outer surface (the surface facing the inner wall of the container body 1) is covered with a polyethylene layer. Figure 3 shows an example of a sample of the membrane 2 according to this embodiment.

[0022] 1 to 3, membrane 2 has a canopy-corresponding portion 21 that covers the inner wall of canopy portion 12, and an extension portion 22 that extends rearward from the outer periphery of canopy-corresponding portion 21 and covers the vicinity of the front end of the inner wall of body portion 11. The outer edge shape and dimensions of canopy-corresponding portion 21 are set to fit the rear surface of disc-shaped portion 12a, and the extension length of extension portion 22 is set to about 5 mm, for example. The extension length of extension portion 22 can be set to any length, with a guideline of, for example, 30 mm or less.

[0023] The membrane 2 is formed by bending backward a portion near the outer periphery of a flat film body (the laminate of aluminum foil and polyethylene described above) with a circular outer edge, the extension portion 22 being formed by the portion near the outer periphery, and the canopy-corresponding portion 21 being formed by the inner portion of the portion near the outer periphery. This makes it possible to easily form a roughly cup-shaped membrane 2 as shown in Figure 3 using the film body described above.

[0024] The plunger 3 is a member formed in a cylindrical shape with a bottom, and is formed, for example, by providing an aluminum barrier layer on a polyethylene body, and the outer diameter is set to be equal to or slightly larger than the inner diameter of the body part 11. The plunger 3 is fitted into the rear opening end of the body part 11 so that the bottom side faces forward. Grease is provided between the plunger 3 and the body part 11 to reduce sliding resistance and allow the plunger 3 to move smoothly. This grease also serves to prevent the ingress and egress of gas, moisture, etc. in the gap between the plunger 3 and the body part 11, and functions as a lubricant with high barrier properties.

[0025] The barrier film 4 is provided so as to entirely cover the outer surface of the body 11, and is formed, for example, as a laminated film with a sandwich structure in which aluminum foil is sandwiched between plastic films. As described above, the membrane 2 and the barrier film 4 are thin films, but are laminated with aluminum foil, and have very high barrier properties. It is desirable that the barrier film 4 at least covers the area from the rear end of the body 11 to the same position as the position near the rear end of the extension 22 (i.e., the inside of the container body 1 is completely covered by at least one of the membrane 2 and the barrier film 4, except for the insertion position of the plunger 3).

[0026] When unopened, the cartridge-type container CT can maintain the quality of the contents well by sealing the opening OP with the membrane 2, while when in use, it is possible to release the contents by opening the opening OP by breaking the membrane 2. When in use, by setting the cartridge-type container CT in a dedicated tool (e.g., a handgun), the user can easily push out an appropriate amount of the contents by simply moving the plunger 3 forward.

[0027] The cartridge-type container CT of this embodiment uses a membrane 2 having a lid-corresponding portion 21 and an extension portion 22. The lid-corresponding portion 21 is fused to the inner wall of the lid portion 12 (the rear surface of the disk-shaped portion 12a) and covers this portion. The extension portion 22 is fused to the vicinity of the front end of the inner wall of the body portion 11 and covers this portion.

[0028] In this way, the membrane 2 is not limited to the inner wall of the canopy 12, but continuously covers and is fused to the inner wall of the container body 1 up to a region near the front end of the inner wall of the body 11 via a corner portion 13 (the portion where the body 11 and the canopy 12 meet at a substantially right angle in the cross section shown in FIG. 1) formed at the boundary between the body 11 and the canopy 12. Therefore, the cartridge-type container CT of this embodiment can obtain higher barrier properties than when it is assumed that the membrane 2 covers and is fused only to the inner wall of the canopy 12. The verification results on this point (results of the contents preservation test) will be explained in detail later.

[0029] Furthermore, compared to the case where membrane 2 covers and is fused only to the inner wall of canopy portion 12, in this embodiment, a wider fused area can be secured by fusion at extension portion 22, and membrane 2 also covers corner portion 13, which is relatively prone to problems with barrier properties due to stress concentration, etc., so that it is advantageous in terms of barrier properties from these viewpoints as well. If corner portion 13 has a roundness (R), it is desirable for membrane 2 to cover the entire roundness.

[0030] If we assume that the container body 1 is formed by rotational welding of the canopy portion 12 to the body portion 11 (welding performed by pressing one against the other while rotating at high speed), the corner portions 13 corresponding to the fused portions will be thick and uneven, and it is not easy to cover the corner portions 13 and provide the membrane 2 appropriately. However, in this embodiment, the container body 1 is formed by integral molding, so the corner portions 13 do not become thick and uneven, and it is easy to cover the corner portions 13 and provide the membrane 2 appropriately.

[0031] In this embodiment, the membrane 2 continuously covers the inner wall of the container body 1 from the canopy 12 to the area near the front end of the body 11, so that at least one of the membrane 2 and the barrier film 4, which have high barrier properties, covers all parts of the container body 1 except for the rear end from the inside or outside. In this way, in this embodiment, there are no parts where the resin of the container body 1 is exposed (parts that are not covered from either the inside or the outside), so that the barrier property is highly reliable.

[0032] As described above, the membrane 2 according to this embodiment is provided inside the container body 1, which has a canopy portion 12 having an opening OP provided on the front side of a cylindrical body portion 11, so as to close the opening OP. Furthermore, the membrane 2 has a canopy-corresponding portion 21 that covers the inner wall of the canopy portion 12, and an extension portion 22 that extends rearward from the outer periphery of the canopy-corresponding portion 21 and covers the vicinity of the front end of the inner wall of the body portion 11. Therefore, as described above, by using the membrane 2, it is easy to obtain higher barrier properties in the cartridge-type container CT.

[0033] In order to verify the effects of the membrane according to this embodiment, a content preservation test was carried out using samples. This will be described below.

[0034] <Test conditions> A sample of the cartridge-type container according to the present embodiment was formed by fusing a membrane with an extension part of different lengths to a container body formed by injection molding, attaching a plunger, and providing a barrier film on the entire outer periphery. The specific configuration of each member is as follows: (1) Container body: Made of high-density polyethylene with a total length of 216 mm, outer diameter of 50 mm, and thickness of 1.15 mm. (2) Membrane: formed by laminating a PET film (thickness 12 μm), a PP film (thickness 40 μm), an aluminum foil (thickness 40 μm), and a PE film (thickness 20 μm). (3) Plunger: This was formed by laminating a PE film (thickness 25 μm) and aluminum foil (thickness 40 μm) on the rear side of the bottom surface (the side facing the outside of the container) of a bottomed cylindrical member made of high-density polyethylene with a total length of 20 mm, an outer diameter of 48 mm, and a thickness of 1 mm. (4) Barrier film: formed by laminating a PET film (thickness 12 μm), an aluminum foil (thickness 9 μm), and a PE film (thickness 25 μm). Regarding the membranes, three or more each of the following lengths of extension portion were prepared: 0 mm (i.e., a form in which no extension portion was provided), 3 mm, 7 mm, and 15 mm, and multiple containers were formed using each of the prepared membranes.

[0035] The containers formed as described above were filled with three different types of sealant as the contents, stored in an atmosphere with a temperature of 50°C and a relative humidity of 90%, and the state of the contents after one month was observed visually and by touch. The three different types of sealant used were a moisture-curing silicone-based sealant (hereinafter abbreviated as "silicone-based material"), a moisture-curing modified silicone-based sealant (hereinafter abbreviated as "modified silicone-based material"), and a moisture-curing urethane-based sealant (hereinafter abbreviated as "urethane-based material").

[0036] <Test Results> Table 1 shows an overview of the results of the content storage test carried out under the above conditions. In Table 1, "○" indicates that no change in the state of the content was observed, "△" indicates that an increase in the viscosity of the content was observed, and "×" indicates that hardening of the content was observed. In other words, "△" and "×" indicate that a change occurred in the state of the content. [Table 1]

[0037] As shown in Table 1, when a membrane with an extension length of 0 mm, i.e., a membrane without an extension, was used, thickening was observed near the corners when the contents were modified silicone-based materials, and hardening was observed near the corners when the contents were urethane-based materials. On the other hand, when the extension length was 3 mm or more, no change in state was observed for any of the contents. From the above results, it was confirmed that by providing an extension to the membrane as in this embodiment, the barrier properties of the container are improved and changes in the state of the contents are effectively suppressed.

[0038] 2. Manufacturing method of cartridge-type container Next, a method for manufacturing the cartridge-type container CT will be described with reference to FIGS.

[0039] After the container body 1 is formed in advance by integral molding of resin, a process of inserting the membrane 2 into the container body 1 is performed. FIG. 4 shows a schematic diagram of this process. The membrane 2 is set at the front end of the insertion jig X, and is sent into the container body 1 by inserting the insertion jig X into the container body 1 from the rear. The outer diameter of the membrane 2 set in the insertion jig X is approximately equal to or slightly smaller than the inner diameter of the body 11, and the membrane 2 is inserted while being lightly rubbed against the inner wall of the body 11. It is not necessary to heat the insertion jig X and the membrane 2, and they are inserted at room temperature, so the inner wall of the container body 1 is not damaged by heat during the insertion.

[0040] 5 is a configuration diagram seen from the rear of the container body 1. As shown in Fig. 4 and Fig. 5, three ring-shaped protrusions 12a1 each surrounding the opening OP are formed on the rear surface of the disk-shaped portion 12a. All of these protrusions 12a1 are slight protrusions with a height of 1 mm or less, and each has the same height.

[0041] After the membrane 2 is inserted deep inside the container body 1, the membrane 2 is pressed against the disk-shaped portion 12a by the insertion jig X as shown in Fig. 6. At this time, the front surface of the membrane 2 (canopy-corresponding portion 21) covers the entire rear surface of the disk-shaped portion 12a, and hits each of the protruding portions 12a1 strongly. The side surface of the membrane 2 (extension portion 22) covers the vicinity of the front end of the body portion 11. There is almost no gap between the canopy-corresponding portion 21 and the disk-shaped portion 12a, and between the extension portion 22 and the body portion 11.

[0042] In addition, in a state where the membrane 2 is pressed against the disk-shaped portion 12a by the insertion jig X, as shown in FIG. 7, high-frequency induction heating (a form of electromagnetic induction heating) is performed by passing an electric current through the aluminum foil (a form of a conductive layer) of the membrane 2. This high-frequency induction heating can be performed using a high-frequency power source arranged outside the container body 1. In addition, since the aluminum foil of the membrane 2 is directly heated by itself without contacting a heat source, the entire membrane 2 can be heated uniformly and efficiently, and deformation and deterioration of the container body 1 due to heat can be suppressed as much as possible. Note that, as long as the membrane 2 can be appropriately heated, electromagnetic induction heating using a method other than high frequency may be performed. The electromagnetic induction heating method is excellent in terms of high-speed heating, easy temperature control, and clean handling.

[0043] When the aluminum foil of the membrane 2 is heated in this manner, the heat is transferred to the polyethylene layer on the surface of the membrane 2 and to the inner wall of the container body 1, fusing them together. At this time, the front surface of the membrane 2 (canopy-corresponding portion 21) is in strong contact with each of the protruding portions 12a1, so that particularly reliable and sufficient fusing is achieved in this portion.

[0044] In addition, since each of the protruding portions 12a1 is formed in a ring shape surrounding the opening OP, if at least these portions are sufficiently fused to the canopy corresponding portion 21, it is possible to reliably seal the container body 1. Furthermore, as the fusion of the canopy corresponding portion 21 and each of the protruding portions 12a1 progresses, the distance between the canopy corresponding portion 21 and the disk-shaped portion 12a decreases, and the canopy corresponding portion 21 is fused to the entire disk-shaped portion 12a.

[0045] The number and shape of the protrusions provided on the rear surface of the disk-shaped portion 12a are not limited to the above. For example, the protrusions may be embossed or uneven on the entire rear surface of the disk-shaped portion 12a. It is also possible to not provide any protrusions on the rear surface of the disk-shaped portion 12a.

[0046] 7, there is almost no gap between the side surface (extension 22) of the membrane 2 and the body 11, so that both are fused together. For example, the front end of the insertion jig X may be configured to be expandable in the radial direction, so that the extension 22 can be pressed radially outward. In this way, the extension 22 can be pressed in this manner in the state shown in FIG. 7, and the extension 22 and the body 11 can be fused together more reliably and sufficiently. After the membrane 2 is fused to the container body 1, the insertion jig X is removed, and the plunger 3, barrier film 4, etc. are attached to the container body 1 to complete the cartridge-type container CT.

[0047] As a method for fixing the membrane to the container body, the above-mentioned high-frequency induction heating fusion method is preferable in consideration of productivity, quality, etc., but other methods can also be adopted. An example of another method will be described below.

[0048] First, as an example of this method, there is a method in which the membrane 2 is heated by irradiating it with a laser, and the membrane 2 is fused to the container body 1. Compared to high-frequency induction heating, this method requires a relatively large amount of time and effort to heat the entire membrane 2 evenly, and there is a possibility that some parts are easily insufficiently heated, but it is possible to fix the membrane 2 to the container body 1.

[0049] Another example is a method of applying ultrasonic waves to generate vibrations to fix the membrane 2 to the container body 1. This method may generate some debris, but it is possible to fix the membrane 2 to the container body 1.

[0050] As yet another example, a method is given in which a heated hot plate is inserted into the container body 1 and the heat is used to fuse the membrane 2 to the container body 1. However, when this method is adopted, it is desirable to prevent the hot plate from directly contacting the side wall of the body 11 when it is inserted into the container body 1. For example, it is desirable to make the hot plate sufficiently smaller than the inner diameter of the body 11 so that it can be inserted without contacting the side wall, and to make the hot plate an expandable split type so that the extension 22 can be pressed against the body 11 after insertion. As a method for fusing the membrane 2 to the container body 1, in addition to a method for realizing the fusing by heating the membrane 2 in a state where the membrane 2 is in contact with the container body 1, a method for realizing the fusing by pressing a preheated membrane 2 against the container body 1 (for example, a method for pressing the membrane 2 arranged at the tip of a hot plate against the container body 1 together with the hot plate, or a method for preheating the remaining part of the membrane 2 and pressing it against the container body 1 when a part of the membrane 2 is insert molded as described later) may be adopted. Also, the membrane 2 may be heated in a state where the hot plate and the membrane 2 are not in contact with each other by bringing a hot plate close to the membrane 2 in contact with the container body 1 and utilizing the radiant heat of the hot plate, etc.

[0051] In addition, when insert molding the membrane, due to the structure of the mold used for the molding, it is difficult to attach the cup-shaped membrane as in this embodiment to the container body 1 at once. Therefore, it is considered to form the container body 1 by insert molding the part (ring-shaped part) corresponding to the extension part 22 of the membrane, and attach the part (flat part) corresponding to the canopy corresponding part 21 of the membrane to the container body 1 using a hot plate or the like, and this method can obtain a product similar to this embodiment. In addition, in view of the fact that it is difficult to insert mold the part corresponding to the opening OP in the membrane 2 (conveniently referred to as the "opening corresponding part") due to the structure of the mold used for injection molding of the container body 1, it is also possible to form the container body 1 by insert molding the part of the membrane other than the opening corresponding part (i.e., the part consisting of the part near the outer periphery of the canopy corresponding part 21 and the extension part 22), and attach the opening corresponding part to the container body 1 using a hot plate or the like.

[0052] Although the embodiment of the present invention has been described above, the configuration of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention. In other words, the above embodiment is an example in all respects and should be considered as not restrictive. The technical scope of the present invention is indicated by the claims, not the description of the above embodiment, and should be understood to include all modifications that fall within the meaning and scope of the claims. [Industrial Applicability]

[0053] The present invention can be used, for example, in containers for storing caulking materials or adhesives. [Explanation of symbols]

[0054] 1 Container body 11. Torso 12 Canopy 12a Nozzle part 12b Convex part 13 Corner section 2. Membrane 21 Canopy support part 22 Extension 3 Plunger 4. Barrier Film CT Cartridge-type container X Insertion Jig

Claims

1. A container is an integrally molded resin product, and is composed of a container body having a lid portion with an opening at the center provided on the front side of a cylindrical body portion, and a barrier film provided on the outer surface of the body portion, a barrier member is provided on an inner wall of a canopy of the container body so as to close the opening, the barrier member having a canopy corresponding portion covering the inner wall of the canopy and an extension portion extending rearward from an outer periphery of the canopy corresponding portion; the extension portion comprises a portion that is fixed to the R-portion wall surface of the inner wall of the corner portion extending from the inner wall of the canopy portion to the inner wall of the body portion so as to cover the entire R-portion along the R-portion wall surface of the inner wall of the corner portion extending from the inner wall of the canopy portion to the inner wall of the body portion, and a portion that is fixed to the vicinity of the front end portion of the inner wall of the body portion continuing from the R-portion of the inner wall,

2. 2. The container according to claim 1, wherein the inner wall of the canopy is provided with one or more ring-shaped protrusions surrounding the opening.

3. 3. The container according to claim 1 or 2, A container characterized in that a plunger is provided to close the rear side of a body portion of the container body, and the plunger is movable within the body portion.

4. A method for manufacturing a container according to any one of claims 1 to 3, comprising the steps of: A manufacturing method characterized by inserting an insertion jig with the barrier material set at its tip into the inside of the container body from the rear, pressing the canopy corresponding part against the inner wall of the canopy part and pressing the extension part radially outward, and then heating the canopy corresponding part and the extension part to adhere to the container body.

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