JP7180634B2 - Moisture-curable material container, inner bag, and method for manufacturing inner bag - Google Patents

Description

The present invention relates to a moisture-curable material container in which a moisture-curable material filled in an inner bag is turned upside down together with the inner bag and placed inside a cylindrical container such as a drum can or a pail, and the moisture-curable material. The present invention relates to an inner bag which is filled in a cylindrical container by turning it upside down, and a method for manufacturing the inner bag.

As a method of filling the moisture-curable material, the inner bag is filled in the container, the content such as moisture-curable resin is filled, and the opening of the inner bag is closed to produce a filling cylindrical container; a step of laying down the cylindrical container and the empty cylindrical container so that their respective openings face each other; a step of abutting the opening of the filled cylindrical container and the opening of the empty cylindrical container; are butted against each other and the entire container is erected substantially vertically so that the empty container is positioned downward, and the inner bag filled with the contents is turned into an empty container with the mouth of the inner bag facing downward. A method for reversing filling of a container, which consists of a step of moving the container into the container and a step of separating the cylindrical containers, has been proposed and put into practical use (see, for example, Patent Document 1).

In this filling method, after the moisture-curable resin is filled into the inner bag, when the opening of the inner bag is closed, air remains in the closed portion of the opening. Even when the moisture-curable resin is cured, since the bottom side of the inner bag is placed upward in the empty container, it is possible to prevent the moisture-curable resin from being mixed with the cured product.

JP-A-9-95393

The applicant of the present invention uses, as the inner bag of the invention described in Patent Document 1, an inner bag in which the ends of a cylindrical body film are folded inward and superimposed on the outer peripheral portion of the outer surface side of the bottom film and fused together, It was found that there are the following problems.

With the filled cylindrical container and the empty cylindrical container butted against each other, the whole is erected almost vertically so that the empty cylindrical container is positioned downward, and the inner bag filled with the moisture-curable material is turned upside down. When the inner bag is moved to the empty cylindrical container, wrinkles are generated in the upper portion (original bottom portion) of the inner bag due to the flow of the filled moisture-curable material, and the central portion of the upper portion of the inner bag bulges upward. However, when the upper portion of the inner bag is wrinkled, pinholes may be formed in the aluminum layer of the laminate film forming the upper portion of the inner bag, and the material may be partially cured. In addition, if the central portion of the upper portion of the inner bag bulges upward, when the follower plate is pressed against the upper portion of the inner bag to take out the moisture-curable material, the gap between the outer peripheral portion of the follower plate and the outer peripheral portion of the upper portion of the inner bag will be large. is formed. For this reason, the moisture-curable material is normally used with the follower plate of the pump pushed down until the discharge amount of the moisture-curable material stabilizes, that is, until the gap disappears. Since it is necessary to dispose of the moisture-curable material that is discharged into the nozzle, there is a problem of increased material loss.

An object of the present invention is to prevent the occurrence of pinholes in the aluminum layer, reduce the material loss when taking out the moisture-curable material, and prevent the manufacturing cost from increasing. Another object of the present invention is to provide an inner bag and a method for manufacturing the inner bag that can efficiently manufacture such an inner bag.

The present invention includes the following inventions.
(1) Moisture-curable material storage in which an inner bag made of a laminated film containing an aluminum layer is filled with the moisture-curable material, is turned upside down, and is placed inside a cylindrical container together with the inner bag. body, wherein the inner bag has a cylindrical body and a circular closing portion that closes a first end of the body, and a cylindrical bent portion on the outer circumference of the closing portion is provided, and the bent portion is fused to the inner peripheral surface of the first end of the body with the free end side facing the second end of the body, and the second end of the body An opening is provided at an end of the inner bag, and the inner bag is filled with the moisture-curable material and the opening is closed by the inner bag itself , and the closing portion side faces the upper side of the cylindrical container. The moisture-curable material is removed from the inner bag by making an incision in the center of the closure and using a follower plate of the pump to remove the moisture-curable material from the inner bag. A moisture-curable material container, characterized in that the closing portion is pressed downward to be performed through the opening of the follower plate . In this specification, the term "film" does not have a strict meaning in terms of thickness, but is used as a general term including films and sheets.

(2) The inner bag made of a laminate film containing an aluminum layer, which is filled with a moisture-curable material and closed by the inner bag itself , and which is turned upside down and placed inside a cylindrical container. , the inner bag has a cylindrical body and a circular closing portion that closes a first end of the body, and a cylindrical bent portion is provided on the outer peripheral portion of the closing portion, The bent portion is fused to the inner peripheral surface of the first end in the longitudinal direction of the body with the free end facing toward the second end of the body. An opening is provided at an end, and the total thickness of the aluminum layer at the fusion-bonded portion between the bent portion and the first end of the body is 10 to 40 μm , and the moisture-curing property from the inner bag The inner bag is characterized in that the material is taken out from the opening of the follower plate by making an incision in the central portion of the closing portion and pressing the closing portion downward with a follower plate of a pump.

(3) The inner bag according to (2) above, wherein the width of the fused portion is 5 to 30 mm.

(4) The inner bag according to (2) or (3) above, wherein the thickness of the laminate film forming the body portion and the closing portion is 30 to 150 μm.

(5) Any one of the above (2) to (4), wherein the laminate film constituting the body portion and the closure portion is a laminate film formed by laminating a nylon layer, an aluminum layer, a nylon layer and a polyolefin layer in this order. Inner bag described in .

(6) The inner bag according to any one of (2) to (5) above, wherein a polyolefin layer is arranged on the fusion-bonded surface side of the bent portion and the body portion.

(7) A method for manufacturing an inner bag using a laminate film containing an aluminum layer, which is filled with a moisture-curing material and is turned upside down in a cylindrical container, comprising: A circular blocking film that forms the circular blocking portion of the inner bag is placed on a disc-shaped mounting table having a diameter approximately the same as the inner diameter of the cylindrical body, and the blocking film is mounted with a pressing plate. holding the film on a mounting table; bending the blocking film downward along the outer peripheral edge of the mounting table to form a bent portion; a step of fitting the body film on the mounting table from the upper side of the writing table and moving the body film relatively downward until an upper first end portion of the body film is fitted on the mounting table; and fusing the inner peripheral surface of the first end of the body film and the outer peripheral surface of the bent portion.

(8) The method for producing an inner bag according to (7) above, wherein the mounting table has a plate thickness of 10 to 50 mm.

According to the moisture-curable material container and the inner bag according to the present invention, the cylindrical bent portion is bent on the outer peripheral portion of the closing portion, and the cylindrical bent portion is fused to the inner peripheral surface of the body portion. It is possible to increase the strength of the outer peripheral portion of the upper portion of the inner bag and prevent the upper end side of the fusion-bonded portion between the first end portion of the trunk and the bent portion from falling inward with a simple structure of attaching the inner bag to the closed portion. It is possible to suppress the occurrence of wrinkles in the opening, and to suppress the problem that the central portion of the closed portion bulges upward. In addition, since the occurrence of wrinkles in the closed portion can be suppressed in this way, local hardening of the moisture-curable material due to the formation of pinholes in the aluminum layer of the laminate film forming the closed portion can be prevented. In addition, since it is possible to suppress the problem that the central portion of the blocking portion bulges upward, when the follower plate of the pump is pressed against the blocking portion and the moisture-curable material filled in the inner bag is taken out, the blocking portion and the By reducing the gap between the outer peripheral portions of the follower plate, it is possible to reduce the loss of material that was discarded in the early stage of taking out. In addition, since the inner bag can be composed of the body portion and the closing portion in the same manner as the conventional inner bag, and does not require separate members, the manufacturing cost of the moisture-curable material container and the inner bag does not increase.

In addition, according to the inner bag of the present invention, since the total thickness of the aluminum layer at the fused portion between the bent portion and the first end of the body portion is 10 to 40 μm, the fusion between the body portion and the bent portion is minimized. It is possible to more effectively prevent the upper end side of the fused portion from collapsing inward by sufficiently securing the strength of the fused portion.

According to the inner bag manufacturing method of the present invention, the inner bag can be manufactured easily and efficiently by a simple method using a mounting table.

FIG. 1 is an exploded vertical cross-sectional view of a container. FIG. 2 is a longitudinal sectional view of the inner bag. FIG. 3 is a vertical cross-sectional view of the vicinity of the bent portion of the inner bag. FIG. 4 is a cross-sectional view of a laminate film forming the inner bag. 5 to 7 are explanatory diagrams of a method of assembling the container, and FIG. 5 is an explanatory diagram of a state in which the transfer container is loaded with the inner bag and filled with the moisture-curable material. 5 to 7 are explanatory diagrams of a method of assembling the container, and FIG. 6 is an explanatory diagram of closing the upper portion of the closing cylinder portion of the inner bag filled with the moisture-curable material. 5 to 7 are explanatory diagrams of a method of assembling the container, and FIG. 7 is an explanatory diagram when transferring the inner bag filled with the moisture-curable material to the cylindrical container. FIG. 8 is an explanatory view when taking out the moisture-curable material from the container. 9 to 12 are explanatory diagrams of the method for manufacturing the inner bag, and FIG. 9 is an explanatory diagram when setting the closing film on the mounting table of the jig. 9 to 12 are explanatory diagrams of the method of manufacturing the inner bag, and FIG. 10 is an explanatory diagram of forming a bent portion by bending the outer peripheral portion of the closing film set on the mounting table. 9 to 12 are explanatory diagrams of the method of manufacturing the inner bag, and FIG. 11 is an explanatory diagram when the body film is fitted onto the closing film set on the mounting table. 9 to 12 are explanatory diagrams of the inner bag manufacturing method, and FIG. 12 is an explanatory diagram when the upper end portion and the bent portion of the body film are fused.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the container 1 includes a cylindrical container 10, an inner bag 20 inside the cylindrical container 10, and a moisture-curable material 2 filled in the inner bag 20. With the material 2 filled in the inner bag 20, the material 2 is turned upside down together with the inner bag 20 so that the first closing portion 22 (this corresponds to the closing portion) of the inner bag 20 is arranged on the upper side. It is housed in a cylindrical container 10 .

The cylindrical container 10 includes a cylindrical body member 11, a bottom plate 12 that closes the lower end of the body member 11, and a top lid 13 that closes the upper end of the body member 11. It consists of a known metal can with a cylindrical bottom.

As the moisture-curable material 2, urethane-based, silicone-based, modified silicone-based adhesives, sealing materials, etc., which are cured by condensation reaction with moisture in the air, can be accommodated.

As shown in FIG. 2, the inner bag 20 includes a cylindrical body portion 21 and a circular first closing portion 22 that closes a first end portion 21a (lower end portion in FIG. 2) of the body portion 21, It is constructed in a cylindrical shape with a bottom using a laminate film containing an aluminum layer.

As shown in FIGS. 2 and 3, a cylindrical bent portion 24 extending upward is provided on the outer peripheral portion of the first closing portion 22, and the bent portion 24 extends from the first end portion 21a of the body portion 21. The free end side is fused to the inner peripheral surface toward the second end portion 21b side of the body portion 21, and the first fused portion 25 ( This corresponds to a fused portion.) is formed in an annular shape, and the bottom portion of the inner bag 20 is closed with a first closing portion 22 in a liquid-tight manner.

As shown in FIG. 2, an opening 23 is formed in the second end 21b (the upper end in FIG. 2) of the body 21, and the liquid of the moisture-curable material 2 at the time of full filling is formed in the upper part of the body 21. A closing cylinder 26 is provided that extends above the surface 2a (see FIG. 5), and the opening 23 prevents air from entering the inner bag 20 when the inner bag 20 is filled with the moisture-curable material 2. While doing so, the upper front part and rear part of the closing cylinder part 26 are superimposed on each other, and then folded and taped to form a sealing part 26a. It is closed by 2 closing part 26A. However, the opening 23 can be closed by any known closing method as long as it can be closed so that no air remains in the inner bag 20 .

As shown in FIG. 4, the laminate film 30 that constitutes the trunk portion 21 and the first closing portion 22 has at least one aluminum layer 31 laminated in the middle so as to block moisture in the air. and the outer peripheral surface of the bent portion 24 (the lower surface of the first closing portion 22) are mainly made of a thermoplastic synthetic resin material such as polyolefin resin that can be fused to each other by heat sealing, ultrasonic sealing, or the like. Except for the provision of the sealant layer 32 as a component, any laminated structure can be formed in consideration of durability, pinhole resistance, tear resistance, economy, and the like. For example, a laminate film 30 having a four-layer structure in which a nylon layer 33, an aluminum layer 31, a nylon layer 34, and a sealant layer 32 are laminated in order can be employed. Polyethylene, polypropylene, and polystyrene can be used as the polyolefin resin forming the sealant layer 32 . It is preferable to use the laminate film 30 having such a structure because it can block moisture in the air and is excellent in tear resistance. In addition, the nylon layer 34 is arranged on the side of the first closing portion 22 that contacts the moisture-curable material 2, and even if the moisture-curable material 2 is cured at the contact portion with the first closing portion 22, the cured material is adhered to the nylon layer 34, it is possible to prevent the cured product of the moisture-curable material 2 from being discharged when the first closing portion 22 is cut and the moisture-curable material 2 is taken out. The trunk portion 21 and the first closing portion 22 can be made of laminated films having the same laminated structure, but can also be made of laminated films of different laminated structures.

Although the thickness T1 of the laminate film 30 is not particularly limited, it is preferably 30 μm or more and 150 μm or less, more preferably 80 μm or more and 120 μm or less. The thickness T1 is preferably 30 μm or more so as to obtain durability and tear resistance, and is preferably 150 μm or less so as to obtain handleability and economy.

A total thickness T2 (not shown) of the aluminum layer 31 in the trunk portion 21, the bent portion 24, and the first fused portion 25 is preferably 10 μm or more and 40 μm or less, more preferably 14 μm or more and 30 μm or less. The total thickness T2 is preferably 10 μm or more in order to prevent the upper end side of the first fused portion 25 from collapsing inward, and is preferably 40 μm or less in order to improve pinhole resistance.

Although the width W of the first fused portion 25 is not particularly limited, it is preferably 5 mm or more and 30 mm or less, and more preferably 9 mm or more and 19 mm or less. The width W of the first fused portion 25 is preferably 5 mm or more in order to ensure sufficient sealing performance in the first fused portion 25, and is preferably 30 mm or less in order to reduce the amount of laminate film 30 used.

Next, an example of a method of assembling the container 1 will be described. However, the container 1 of the present invention can be assembled by other assembly methods.

First, as shown in FIG. 5, a transfer container 10A having a body member 11A and a bottom plate 12A and having the same inner diameter as the cylindrical container 10 is used. Then, the inner bag 20 is filled with the moisture-curable material 2 so that air is not mixed into the moisture-curable material 2. - 特許庁As the transfer container 10A, a container such as a drum can or a pail having the same inner diameter as the cylindrical container 10 can be used. can also be used.

Next, as shown in FIG. 6, the front and rear portions of the second end 21b of the closing tube 26 are overlapped so that no air remains in the upper portion of the inner bag 20, and then folded and taped. The opening 23 of the inner bag 20 is closed with the second closing portion 26A composed of the blocking cylindrical portion 26, which forms a sealing portion 26a. However, the opening 23 can be closed by any known closing method as long as it can be closed so that no air remains in the inner bag 20 .

Next, as shown in FIG. 7, with the transfer container 10A lying sideways, the cylindrical containers 10 forming the container 1 are placed horizontally with their openings facing each other. , the cylindrical container 10 and the transfer container 10A are rotated at a low speed by 90° in the direction indicated by the arrow A in FIG. The curable material 2 is transferred to the cylindrical container 10 together with the inner bag 20, and the inner bag 20 filled with the moisture-curable material 2 is placed in the cylindrical container 10 with the first closing part 22 facing upward, Thereafter, the transfer container 10A is removed, and the container 1 is obtained by assembling the upper cover 13 to the cylindrical container 10 as shown in FIG.

On the other hand, when taking out the moisture-curable material 2 stored in the container 1, the upper lid 13 is removed, the central portion of the first closing portion 22 is cut open, and then the cylindrical container is opened as shown in FIG. 10 is inserted into the cylindrical container 10 from the upper side, the lower surface of the follower plate 40 presses the first closing portion 22 downward, and moisture is released from the opening 41 of the follower plate 40. The curable material 2 is taken out.

In the container 1 and the inner bag 20, a cylindrical bent portion 24 is bent on the outer peripheral portion of the first closing portion 22, and the cylindrical bent portion 24 is fused to the inner peripheral surface of the body portion 21. The strength of the outer peripheral portion of the upper portion of the inner bag 20 is increased, and the upper end side of the first fused portion 25 between the first end portion 21a of the body portion 21 and the bent portion 24 is aligned with the arrow shown in FIG. Since it is possible to prevent the first closing portion 22 from collapsing inward as indicated by B, it is possible to suppress the occurrence of wrinkles in the first closing portion 22 and to suppress the problem that the central portion of the first closing portion 22 bulges upward. Since the occurrence of wrinkles in the first closing portion 22 can be suppressed in this way, the moisture-curable material 2 can be prevented from forming pinholes in the aluminum layer 31 of the laminate film 30 constituting the first closing portion 22 . can prevent local hardening of In addition, since the problem that the central portion of the first closing portion 22 bulges upward can be suppressed, as shown in FIG. When the filled moisture-curable material 2 is taken out, the gap between the first closing part 22 and the outer peripheral part of the follower plate 40 can be reduced to reduce the material loss that was discarded at the initial stage of taking out. Moreover, like the conventional inner bag, the inner bag 20 can be composed of the body portion 21 and the first closing portion 22, and no separate members are required. Production costs do not increase.

Next, an example of a method for manufacturing the inner bag 20 will be described. However, the inner bag 20 of the present invention can also be manufactured by a manufacturing method other than this.

First, as shown in FIG. 9, a leg plate 51, a post 52 extending upward from the leg plate 51, and a disk-shaped mounting table 53 having substantially the same diameter as the inner diameter of the body portion 21 is rotatably provided on the upper end of the post 52. A circular blocking film 22A constituting the first blocking portion 22 is concentrically placed on the mounting table 53 of the jig 50 so that wrinkles are not formed. At this time, the closing film 22A is mounted on the mounting table 53 so that the sealant layer 32 is arranged on the upper side.

A plate thickness T3 of the mounting table 53 is not particularly limited, but is preferably 10 mm or more and 50 mm or less, and more preferably 15 mm or more and 20 mm or less. The thickness T3 of the mounting table 53 is preferably 10 mm or more in order to obtain sealing performance, and is preferably 50 mm or less in order to obtain workability.

Next, as shown in FIG. 10, after placing a pressing plate 54 having substantially the same diameter as the mounting table 53 on the blocking film 22A, a disk-shaped weight plate 55 is placed on the pressing plate 54. Then, the blocking film 22A is set on the mounting table 53. As shown in FIG.

Next, as shown in FIG. 10, the outer peripheral portion 24A of the blocking film 22A projecting outward from the mounting table 53 is bent downward along the corners of the upper surface of the mounting table 53 to form a cylindrical fold. A bend 24 is formed.

Next, as shown in FIG. 11, the cylindrical body film 21A constituting the body 21 is fitted onto the mounting table 53 from the upper side of the mounting table 53, and as shown by the phantom lines in FIG. The body film 21A is relatively moved downward until the upper end portion (first end portion 21a) of the body film 21A is fitted onto the mounting table 53, and the blocking film placed on the mounting table 53 is moved downward. The first end portion 21a of the body film 21A is fitted onto the bent portion 24 of the outer peripheral portion of the film 22A.

Next, as shown in FIGS. 11 and 12, a pair of heating members 56 having partially arc-shaped heating portions 56a that fit the outer peripheral surface of the mounting table 53 are brought close to each other, and are shown in phantom lines in FIG. As shown, the heating portion 56a is pressed against the first end portion 21a of the body film 21A from the outside, and the inner peripheral surface of the first end portion 21a on both sides of the body film 21A and the outer peripheral surface of the bent portion 24 are heated. After that, the heating members 56 are retracted, and then the mounting table 53 is rotated 90 degrees to bring the pair of heating members 56 closer to each other again, and the rest of the space between both sides of the body film 21A. The heating portion 56a is pressed against the portion to fuse the inner peripheral surface of the first end portion 21a of the body film 21A and the outer peripheral surface of the bent portion 24 over the entire circumference. As a method for fusing the inner peripheral surface of the first end portion 21a of the body film 21A and the outer peripheral surface of the bent portion 24 of the blocking film 22A, a method other than the above-described fusing method, for example, all A well-known fusion method such as a method of fusing the periphery at once or a method of sequentially fusing in the circumferential direction at a constant speed can also be employed.

Next, after retracting the heating member 56 and removing the weight plate 55 and the pressing plate 54 , the inner bag 20 is extracted from the mounting table 53 to obtain the inner bag 20 . In addition, when removing the inner bag 20 from the mounting table 53, the pressure inside the inner bag 20 becomes negative and the inner bag 20 does not flatly adhere to the mounting table 53. It is preferable to provide a plurality of air holes 53a.

In this method of manufacturing the inner bag 20, the inner bag 20 can be manufactured easily and efficiently by a simple method using the mounting table 53 as described above.

Although the embodiments of the present invention have been described above, the present invention is by no means limited to the above-described embodiments, and it goes without saying that the configuration can be changed without departing from the gist of the present invention.

1 Container 2 Moisture-curable material 2a Liquid surface 10 Cylindrical container 11 Body member 12 Bottom plate 13 Upper lid 20 Inner bag 21 Body 21a First end 21b Second end 22 First closing part 23 Opening 24 Bending part 25 fused portion 26 closing cylinder portion 26A second closing portion 26a sealing portion 30 laminate film 31 aluminum layer 32 sealant layer 33 nylon layer 34 nylon layer 24A outer peripheral portion 10A transfer container 11A body member 12A bottom plate 40 follower plate 41 opening 21A Body film 22A Blocking film 50 Jig 51 Leg plate 52 Support 53 Mounting table 53a Air hole 54 Pressing plate 55 Weight plate 56 Heating member 56a Heating part

Claims (8)

A moisture-curable material container in which an inner bag made of a laminated film containing an aluminum layer is filled with a moisture-curable material, and the inner bag is turned upside down and placed in a cylindrical container together with the inner bag. hand,
The inner bag has a cylindrical trunk and a circular closing portion that closes a first end of the trunk, and a cylindrical bent portion is provided on the outer circumference of the closing portion. The bent portion is fused to the inner peripheral surface of the first end of the body with the free end facing toward the second end of the body, and has an opening at the second end of the body. is provided,
The inner bag is turned upside down so that the closed part side is arranged on the upper side of the cylindrical container in a state in which the moisture-curable material is filled and the opening is closed by the inner bag itself. and is housed in the cylindrical container,
The moisture-curable material is removed from the inner bag by making an incision in the center of the blockage, pressing the blockage downward with a follower plate of a pump, and through the opening of the follower plate.
A moisture-curable material container, characterized by:
The inner bag is made of a laminate film containing an aluminum layer, and is filled with a moisture-curable material and closed by the inner bag itself , and is turned upside down and inside the cylindrical container,
The inner bag has a cylindrical body and a circular closing part that closes a first end of the body, and a cylindrical bent part is provided on the outer circumference of the closing part, The bent portion is fused to the inner peripheral surface of the first end in the length direction of the body with the free end facing toward the second end of the body. An opening is provided in the part,
The total thickness of the aluminum layer at the fused portion between the bent portion and the first end portion of the body portion is 10 to 40 μm,
The moisture-curable material is removed from the inner bag by making an incision in the center of the blockage, pressing the blockage downward with a follower plate of a pump, and through the opening of the follower plate.
An inner bag characterized by:
3. The inner bag according to claim 2, wherein the width of said fused portion is 5 to 30 mm. 4. The inner bag according to claim 2 or 3, wherein the thickness of the laminate film forming said body portion and said closing portion is 30 to 150 μm. The inner bag according to any one of claims 2 to 4, wherein the laminate film constituting the body portion and the closure portion comprises a laminate film obtained by laminating a nylon layer, an aluminum layer, a nylon layer and a polyolefin layer in this order. . The inner bag according to any one of claims 2 to 5, wherein a polyolefin layer is arranged on the fusion-bonded surface side of the bent portion and the body portion. A method for manufacturing an inner bag made of a laminate film containing an aluminum layer, which is filled with a moisture-curable material and which is placed inside a cylindrical container by turning it upside down, comprising:
A circular blocking film that constitutes the circular blocking portion of the inner bag is placed on a disc-shaped mounting table having approximately the same diameter as the inner diameter of the cylindrical body of the inner bag, and the blocking film is placed. a step of holding on the mounting table with a pressing plate;
forming a bent portion by bending the blocking film downward along the outer peripheral edge of the mounting table;
A cylindrical body film that constitutes the body is fitted onto the mounting table from the upper side of the mounting table until the upper first end of the body film is fitted onto the mounting table. , moving the body film relatively downward;
fusing the inner peripheral surface of the first end of the body film and the outer peripheral surface of the bent portion;
A method for manufacturing an inner bag, comprising: 8. The method for manufacturing an inner bag according to claim 7, wherein the mounting table has a plate thickness of 10 to 50 mm.

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