JP2020100415A - Flexible container and manufacturing method for the same - Google Patents

Abstract

To provide a flexible container excellent in durability of a conductive resin layer of an earth cable connection part, and a manufacturing method for the same.SOLUTION: An earth cable connection part 7 is extended from an outer periphery part 4a. A conductive sheet 8 is interposed between the outer periphery part 4a and a peripheral wall part 2. When subjecting conductive tarpaulin of the peripheral wall part 2 and the outer periphery part 4a of conductive tarpaulin of a lower lid part 4 to high-frequency welding, the peripheral wall part 2, the conductive sheet 8 and the outer periphery part 4a are subjected to high-frequency welding in a state where a lower part of the conductive sheet 8 is sandwiched between an upper part of the outer periphery part 4a and the peripheral wall part 2.SELECTED DRAWING: Figure 4

Description

The present invention relates to a flexible container in which a non-conductive resin layer is formed on a front surface, and a tarpaulin having a conductive resin layer formed on a back surface is joined, and a manufacturing method thereof.

Flexible containers, which are widely used for transporting and storing powders and granules, are subject to the properties of the powders and granules that are stored, and when pouring and discharging the powder granules at the inlet and outlet, vibration during transport, shock, etc. It is known that static electricity is generated by friction between powder particles or between the powder particles and the inner surface of the flexible container.

In order to release static electricity to the ground, the conductive tarpaulin is coated on the surface of the base fabric of the flexible container with a layer made of a rubber material (including a material made of thermoplastic resin) of conductivity-imparting type that is kneaded and mixed with carbon black. It is used. Further, a flexible container is used in which a part of the tarpaulin is extended to provide a tongue-shaped ground wire connecting portion, and the ground wire connecting portion can be held by a clip at the tip of the ground wire.

5 is a schematic side view of a commercially available flexible container (the left half is cut), and FIG. 6 is an enlarged view of a VI portion of FIG. Further, FIG. 7 is a sectional view of the same portion as FIG. 6 showing a state in which the ground wire connecting portion is deteriorated.

The flexible container 1 is provided on the substantially cylindrical peripheral wall portion 2, an upper lid portion 3 that covers the upper end side of the peripheral wall portion 2, a lower lid portion 4 that covers the lower end side of the peripheral wall portion 2, and the upper lid portion 3. The inlet 5 is provided, the outlet 6 provided in the lower lid 4, the earth wire connecting portion 7 ′ provided on the outer surface of the flexible container 1, and the like. Each of the inlet 5 and the outlet 6 has a substantially cylindrical shape having a diameter smaller than that of the peripheral wall portion 2. The inlet 5 extends upward from the center of the upper lid portion 3, and the outlet 6 is the lower lid portion 4. It extends downward from the center of. A ground wire connecting portion 7 ′ is provided on the lower outer peripheral surface of the peripheral wall portion 2.

Each part of the flexible container 1 is made of a conductive tarpaulin. As shown in the figure, the conductive tarpaulin has a conductive resin layer 11 formed on one surface of a base fabric and a non-conductive resin layer formed on the other surface. The conductive tarpaulin is provided with the conductive resin layer inside the flexible container 1. 5 to 7, the base cloth and the non-conductive resin layer are integrally shown and denoted by reference numeral 10.

As shown in FIG. 6, the outer peripheral portion 4 a of the conductive tarpaulin forming the lower lid portion 4 wraps around the lower outer peripheral surface of the peripheral wall portion 2 and is joined to the lower outer peripheral surface by high frequency welding or the like.

The ground wire connecting portion 7'is made of a tongue piece extending from the outer peripheral portion 4a of the conductive tarpaulin. When the powdery or granular material is stored in the flexible container 1, the grounding wire connecting portion 7'is sandwiched by a grounding clip (not shown) at the tip of the grounding wire and grounded.

JP2012-250753A

The ground wire connecting portion 7'is originally intended to ground the flexible container 1 by sandwiching it with the ground clip at the tip of the ground wire as described above. However, at the time of actual work, an operator may try to move the flexible container 1 by grasping the ground wire connecting portion 7′ and pulling the ground wire connecting portion 7′ in the direction of arrow F in FIG. When the ground wire connecting portion 7'is pulled in this way, a strong tensile force is applied to the conductive resin layer 11, and as shown in FIG. 7, the conductive resin layer 11 cracks C near the root of the ground wire connecting portion 7'. May occur, and the electrical resistance between the conductive resin layer 11 of the ground wire connecting portion 7′ and the conductive resin layer 11 of the flexible container 1 may increase. The ground resistance from the ground terminal is specified by JIS C 61340-4-4 to be less than 1×10 ⁸ Ω.

An object of the present invention is to provide a flexible container having excellent durability of a conductive resin layer of a ground wire connecting portion and a method for manufacturing the flexible container.

A flexible container of the first invention is a flexible container in which a peripheral wall portion made of a conductive tarpaulin, a lower lid portion and an upper lid portion are joined, and the conductive tarpaulin has a non-conductive resin layer formed on a front surface thereof, A conductive resin layer is formed on the back surface, and the conductive tarpaulin is provided with the conductive resin layer as the inner side of the flexible container, and the conductive tarpaulin forming the lower lid part or the upper lid part is formed. An outer peripheral portion of the flexible container joined to the outer peripheral surface of the peripheral wall portion, the ground wire connection portion extends from the lower lid portion or the upper lid portion, A conductive sheet is interposed between the ground wire connecting portion and the peripheral wall portion, and the base portion of the conductive sheet is sandwiched between the outer peripheral portion and the peripheral wall portion and bonded to the outer peripheral portion and the peripheral wall portion. It is characterized by being.

1 aspect of 1st invention WHEREIN: Except for the said base part among the said electroconductive sheets, it is the free piece extended from the said outer peripheral part, and the extension length of this free piece is the extension of the said earth wire connection part. It is smaller than the protruding length.

In one aspect of the first invention, the width of the ground wire connecting portion on the base end side is larger than that on the tip end side.

A flexible container according to a second aspect of the invention is a flexible container in which a peripheral wall portion made of a conductive tarpaulin, a lower lid portion and an upper lid portion are joined, and the conductive tarpaulin has a non-conductive resin layer formed on a front surface thereof. A conductive resin layer is formed on the back surface, and the conductive tarpaulin is provided with the conductive resin layer as the inner side of the flexible container, and the conductive tarpaulin forming the lower lid part or the upper lid part is formed. An outer peripheral portion of the peripheral wall portion extends along the outer peripheral surface of the peripheral wall portion, in the flexible container joined to the outer peripheral surface of the peripheral wall portion, the ground wire connecting portion extends from the lower lid portion or the upper lid portion, The right and left width of the ground wire connecting portion is characterized in that the base end side is larger than the tip end side.

A method for manufacturing a flexible container according to the present invention is a method for manufacturing a flexible container according to the first aspect of the present invention, wherein a conductive tarpaulin that constitutes the peripheral wall portion and an outer peripheral portion of the conductive tarpaulin that constitutes a lower lid portion or an upper lid portion are provided. And a step of sandwiching the base portion of the conductive sheet between them and high-frequency welding the peripheral wall portion, the base portion of the conductive sheet, and the lower lid portion or the upper lid portion.

In the flexible container of the first invention, the ground wire connecting portion extends from the outer peripheral portion, the conductive sheet is interposed between the ground wire connecting portion and the peripheral wall portion, and the base portion of the conductive sheet is the outer peripheral portion. Since it is sandwiched between and bonded to the peripheral wall portion, the conductive resin layer of the ground wire connecting portion and the conductive resin layer of the flexible container body side are electrically connected via the conductive sheet. Become. Therefore, even if the worker repeatedly pulls the ground wire connecting part, and even if the conductive resin layer on the base end side of the ground wire connecting part is cracked, it is necessary to take sufficient ground through the conductive sheet. You can

According to the flexible container of the second invention, even if an operator frequently pulls the ground wire connecting portion, the tensile stress generated on the base end side of the ground wire connecting portion is dispersed and a crack is generated in the conductive resin layer. Is suppressed.

It is a cross-sectional perspective view of the flexible container according to the embodiment in the vicinity of the ground wire connecting portion. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is a cross-sectional perspective view of the earth wire connection part vicinity of the flexible container which concerns on another embodiment. It is a side view of the conventional flexible container. FIG. 6 is an enlarged view of a VI portion of FIG. 5. It is sectional drawing which shows the deterioration state of a conductive resin layer.

Hereinafter, embodiments will be described with reference to FIGS.

1 to 3 show the first embodiment. Like the flexible container 1 of FIG. 5, the flexible container according to this embodiment also has a peripheral wall portion 2, an upper lid portion 3, a lower lid portion 4, an inlet 5, an outlet 6, and a ground wire connecting portion 7. (The upper lid part 3, the inlet 5, and the outlet 6 are not shown in FIGS. 1 to 3.). The outer peripheral portion 4a of the lower lid portion 4 rises along the outer peripheral surface of the peripheral wall portion 2 and is joined to the outer peripheral surface of the peripheral wall portion 2 by high frequency welding or the like. A joining method other than high frequency welding may be adopted.

Also in this embodiment, each of the peripheral wall portion 2, the upper lid portion 3 and the lower lid portion 4 is made of a conductive tarpaulin. The conductive resin layer 11 of the peripheral wall portion 2 is located on the inner surface side of the flexible container, the conductive resin layer 11 of the upper lid portion 3 is located on the lower surface side of the upper lid portion 3, and the conductive resin layer 11 of the lower lid portion 4 is located. Is located on the upper surface side of the lower lid portion 4.

In this embodiment, the ground wire connecting portion 7 is integrally formed with a conductive tarpaulin that constitutes the lower lid portion 4 and is a tongue-shaped piece of a free piece extending from the outer peripheral portion 4a.

The ground wire connecting portion 7 has, for example, a lateral width of 20 to 200 mm and a vertical length L ₁ (FIG. 2) of 30 to 100 mm, but the shape and dimensions thereof are not limited thereto. In addition, in this embodiment, the ground wire connecting portion 7 has a trapezoidal shape in which the left-right width increases toward the base end side. In this case, the width W ₂ of the tip portion corresponding to the upper side portion of the trapezoid is preferably 15 to 100 mm, particularly about 25 to 75 mm, and the width W ₁ of the base portion of the ground wire connecting portion 7 corresponding to the bottom side portion of the trapezoid is 30 to. 200 mm, especially about 50 to 150 mm is preferable.

A conductive sheet 8 is interposed between the ground wire connecting portion 7 and the peripheral wall portion 2. The lower portion (base portion) of the conductive sheet 8 is sandwiched between the outer peripheral portion 4a of the lower lid portion 4 and the lower portion of the peripheral wall portion 2 and joined to both the outer peripheral portion 4a and the peripheral wall portion 2 by high frequency welding or the like. Has been done.

The lateral width W ₃ of the conductive sheet 8 is smaller than the lateral width of the ground wire connecting portion 7. The extension length L ₂ (FIG. 2) of the conductive sheet 8 from the outer peripheral portion 4a is 10 to 100%, particularly 25 to 75% of the extension length L ₁ of the ground wire connecting portion 7 from the outer peripheral portion 4a. A degree is preferable. The length (depth) L3 of the sandwiched portion between the outer peripheral portion 4a and the peripheral wall portion 2 of the conductive sheet 8 is preferably ₃ to 50 mm, particularly preferably 5 to 20 mm.

The other construction of this flexible container is the same as that of the flexible container 1 shown in FIGS.

Also in the flexible container according to this embodiment, grounding is performed by mounting a grounding clip at the tip of the grounding wire so as to sandwich the grounding wire connecting portion 7 and more preferably the conductive sheet 8.

Also in this embodiment, an operator may pull the ground wire connecting portion 7. If the worker repeatedly pulls the ground wire connecting portion 7, the conductive resin layer 11 may be cracked on the base end side of the ground wire connecting portion 7 as in the case of FIG. 7.

In this embodiment, since the free piece portion of the conductive sheet 8 is sandwiched between the ground wire connecting portion 7 and the ground clip, even if the conductive resin layer 11 is cracked at the base end portion of the ground wire connecting portion 7. Since the conductive resin layer 11 of the ground wire connecting portion 7 is electrically connected to the conductive resin layer 11 of the outer peripheral portion 4a through the conductive sheet 8, the ground clip has a low resistance to the conductive resin layer 11 of the entire flexible container. It conducts electricity at and can be grounded sufficiently.

Further, since the conductive sheet 8 is welded near the boundary between the ground wire connecting portion 7 and the outer peripheral portion 4a, the conductive resin layer 11 and the conductive sheet 8 are formed near the base end portion of the ground wire connecting portion 7. A conductive layer having a total thickness of This increases the tensile strength of the conductive layer and suppresses cracking of the conductive layer when the ground wire connecting portion 7 is pulled. Therefore, even if the ground clip sandwiches only the ground wire connecting portion 7, sufficient grounding can be achieved.

Further, in this embodiment, since the ground wire connecting portion 7 has a trapezoidal shape, stress when the ground wire connecting portion 7 is pulled by an operator is dispersed on the base end side of the ground wire connecting portion 7, The conductive resin layer 11 is prevented from cracking on the base end side of the ground wire connecting portion 7.

Therefore, according to the present invention, as shown in FIG. 4, even when the conductive sheet 8 is omitted and only the trapezoidal ground wire connecting portion 7 is formed, a corresponding effect can be obtained.

In FIGS. 1 and 4, the ground wire connecting portion 7 has a trapezoidal shape, but the side of the ground wire connecting portion 7 may be formed by a concave curve that draws a skirt or a bent line that is similar to that.

The thickness of the conductive resin layer 11 of the conductive tarpaulin is 0.01 to 1 mm, preferably 0.02 to 0.1 mm, and the thickness of the non-conductive resin layer 12 is 0.1 to 3 mm, particularly It is preferably 0.2 to 1 mm. The thickness of the conductive sheet 8 is preferably 0.01 to 1 mm, particularly preferably 0.02 to 0.1 mm.

[Material, etc.]
Examples of the material of the conductive tarpaulin forming each part of the flexible container 1 include the following, but the material is not limited to these.

Examples of the base fabric of the conductive tarpaulin include woven fabrics made of natural fibers such as cotton and hemp, and synthetic fibers such as polyester fibers, polyamide fibers and vinylon fibers. The base fabric may be a filament or steebles formed by using these fibers alone or in combination of two or more kinds. The woven fabric means a woven fabric or knitted fabric in which these fibers are woven into a plain woven fabric, a twill woven fabric, a satin woven fabric, etc., and the kind and structure of the knitted woven fabric is one that does not impair the flexibility of the conductive tarpaulin, There is no particular limitation.

As the woven fabric constituting the base fabric, a plain woven fabric having a fiber thickness of 500 to 1000 denier and a driving number of 15 to 30 fibers/inch is preferable. When a woven fabric made of polyester fibers or polyamide fibers is used, a flat woven fabric having a fiber thickness of 750 denier and a striking number of 20×20/inch is suitable as the woven fabric. Such a woven fabric generally has a thickness of 0.2 to 2 mm and a width of about 0.5 to 3 m.

The non-conductive resin layer is preferably composed of a thermoplastic resin composition, and particularly preferably composed of a resin layer containing a copolymer layer of ethylene and vinyl acetate. The resin layer containing a copolymer layer of ethylene and vinyl acetate includes a resin layer consisting of a single layer of a copolymer layer of ethylene and vinyl acetate, a copolymer layer of ethylene and vinyl acetate and other layers. It may be a multilayer resin layer in which a resin layer is laminated. As the resin forming the other resin layer, polyvinyl chloride, polyvinyl chloride resin such as vinyl chloride copolymer containing vinyl chloride as a main component, polyethylene such as low density polyethylene, high density polyethylene and chlorinated polyethylene. -Based resins, ethylene-acrylic acid copolymers (EMA), ethylene-methyl methacrylate copolymers (EMMA), ethylene-acrylic acid copolymers such as ethylene-ethyl acrylate copolymer (EEA), polyurethanes , Polyvinyl acetate and the like, but are not limited thereto.

As the ethylene-vinyl acetate copolymer, those having a component polymerization ratio of ethylene and vinyl acetate of 90:10 to 70:30 are preferable. If the proportion of vinyl acetate is less than 10% by mass, the high frequency welding process becomes difficult, and if it exceeds 30% by mass, the heat resistance becomes poor, which is not preferable. A particularly preferred range of the component polymerization ratio of ethylene and vinyl acetate is 85:15 to 75:25. As the ethylene-vinyl acetate copolymer, the melt flow rate (MFR) measured under the conditions of a temperature of 190° C. and a load of 21.28 N (2.16 kgf) according to JIS K7210 is in the range of 0.1 to 5.0. Those in the range of 0.5 to 2.0 are particularly preferable.

The conductive resin layer 11 is preferably made of a thermoplastic resin composition containing conductive carbon black, and is particularly composed of a conductive carbon black and a resin layer containing an ethylene-vinyl acetate copolymer layer as a main component. It is preferable. The resin layer containing the conductive carbon black and the ethylene-vinyl acetate copolymer layer as the main component means a single layer of the ethylene-vinyl acetate copolymer layer (polyolefin resin layer) as the main component containing the conductive carbon black. In addition to the above resin layer, it may be a multilayer resin layer in which another resin layer is laminated on this layer. Other resin layers As the resin forming the resin layer, polyethylene resin such as low density polyethylene, high density polyethylene, chlorinated polyethylene, polypropylene, polypropylene resin such as propylene-ethylene copolymer, ethylene-methyl acrylate copolymer Examples of the polymer include ethylene-acrylic copolymers such as ethylene-methyl methacrylate copolymer and ethylene-ethyl acrylate copolymer. In addition, the other resin layer may include a thermoplastic resin layer containing a specific amount of conductive carbon black.

There is no particular limitation on the conductive carbon black blended in the conductive resin layer, but when the average surface area of the conductive carbon black is relatively small, the amount of the conductive carbon black used becomes large, Disadvantages such as deterioration of fluidity when the thermoplastic resin is formed into a film and extreme decrease in strength of the film are significant. From the viewpoint of physical properties, the conductive carbon black preferably has an average surface area of 30 m ² /g or more, and particularly preferably an average surface area of 100 m ² /g or more.

The amount of conductive carbon black compounded with respect to the thermoplastic resin, preferably a resin containing an ethylene-vinyl acetate copolymer, is preferably 0.1 to 25 parts by mass with respect to 100 parts by mass of the thermoplastic resin. When the blending amount of the conductive carbon black is less than 0.1 parts by mass, the surface specific resistance of the conductive resin layer 11 becomes large and the conductivity is hard to be improved, which is not preferable. When the blending amount of the conductive carbon black exceeds 25 parts by mass, the surface specific resistance of the conductive resin layer 11 becomes small and the conductivity is improved, but the flexibility of the tarpaulin is impaired and the high frequency welding process is performed. This is not preferable because it may increase the risk of sparks. A particularly preferable blending amount of the conductive carbon black with respect to 100 parts by mass of the thermoplastic resin is 3 to 15 parts by mass.

It is preferable that the conductive sheet 8 has conductive resin layers similar to the conductive resin layer 11 provided on both surfaces of the base cloth.

In order to manufacture the flexible container of the present invention, during high frequency welding of the conductive tarpaulin of the peripheral wall portion 2 and the outer peripheral portion 4a of the conductive tarpaulin of the lower lid portion 4, between the upper portion of the outer peripheral portion 4a and the peripheral wall portion 2 is performed. The peripheral wall portion 2, the lower portion of the conductive sheet 8 and the outer peripheral portion 4a may be high frequency welded with the lower portion of the conductive sheet 8 interposed therebetween.

In addition, when the lower portion of the conductive sheet 8 is sandwiched between the peripheral wall portion 2 and the outer peripheral portion 4a in this way and high-frequency welding is performed, the thickness (from the inner surface of the peripheral wall portion 2 to the outer peripheral portion 4a of the peripheral wall portion 2) is sandwiched between the ground wire connecting portions. The thickness up to the outer surface) becomes large. Then, as shown in FIG. 3, a step is formed between the portion sandwiching the conductive sheet 8 and the periphery thereof. In order to reduce this step, it is preferable that the thickness of the conductive sheet 8 be smaller than the thickness of the tarpaulin forming the peripheral wall portion 2 and the lower lid portion 4.

The above-described embodiment is an example of the present invention, and the present invention may have a mode other than that shown in the drawings. For example, in the above-described embodiment, the conductive sheet 8 has a substantially rectangular shape, but when the ground wire connecting portion 7 has a trapezoidal shape or the like, it may have a trapezoidal shape (for example, a similar shape).

In the above embodiment, the ground wire connecting portion 7 and the conductive sheet 8 are arranged on the lower lid portion 4 side, but the ground wire connecting portion and the conductive sheet may be arranged on the upper lid portion 3 side. The configuration in this case is vertically symmetrical in FIGS.

[Example 1]
A flexible container shown in FIGS. 1 to 3 was manufactured in which the peripheral wall portion 2 and the lower lid portion 4 were made of tarpaulin having a thickness of 0.80 mm, and the conductive sheet 8 was made to have a thickness of 0.05 mm. The ground wire connecting portion 7 has a trapezoidal shape with W ₁ =100 mm, W ₂ =50 mm, and L ₁ =60 mm. The conductive sheet 8 was a square with W ₃ =50 mm, L ₂ =40 mm, and L ₃ =10 mm, and the range of 10 mm on the base end side was sandwiched between the outer peripheral portion 4 a and the peripheral wall portion 2 and subjected to high frequency welding.

The earth wire connecting portion 7 was pulled 10 times in the direction perpendicular to the outer peripheral portion 4a (direction F in FIG. 5) at 294N (30 kg) or 392N (40 kg) (load was applied at a speed of 500 N/min to 294 N and 392 N). When it reached, it finished pulling once). Before and after the pulling, a grounding clip was attached so as to sandwich the grounding wire connecting portion 7 and the conductive sheet 8, and the resistance between grounds was measured. The results are shown in Table 1.

[Example 2]
The same flexible container as in Example 1 was manufactured, and the pulling direction during the pulling test was a direction in which the ground wire connecting portion 7 and the extending portion 8 were folded back 180° along the outer peripheral portion 4a (vertically downward direction in FIG. 2). As a result, a tensile test was performed to measure the resistance between grounds. The results are shown in Table 1.

[Examples 3 and 4]
The same tensile tests as in Examples 1 and 2 were performed except that the conductive sheet 8 was omitted. The results are shown in Table 1.

[Comparative Example 1]
The same tensile test as in Example 4 was performed except that the ground wire connecting portion had the configuration of FIG. 6 (width 50 mm, protrusion length 40 mm). The results are shown in Table 1.

[Discussion]
As shown in Table 1, in Examples 1 to 4, even if the ground wire connection portion is repeatedly pulled, the resistance to ground does not increase at all or hardly (the resistance to ground of 3.3 MΩ in Example 4 is low enough to cause no practical problem). It is a value.). On the other hand, when it is pulled in the direction in which the turn-back angle of the ground wire connection portion increases as in Comparative Example 1, it is recognized that the resistance between the grounds increases remarkably.

1 flexible container 2 peripheral wall part 3 upper cover part 4 lower cover part 5 input port 6 discharge port 7, 7'ground wire connection part 8 conductive sheet 10 base cloth and non-conductive resin layer 11 conductive resin layer

Claims (6)

A flexible container formed by joining a peripheral wall portion made of a conductive tarpaulin, a lower lid portion and an upper lid portion,
The conductive tarpaulin has a non-conductive resin layer formed on the front surface and a conductive resin layer formed on the back surface,
The conductive tarpaulin is provided with the conductive resin layer as the inner side of the flexible container,
In a flexible container in which an outer peripheral portion of a conductive tarpaulin forming the lower lid portion or the upper lid portion extends along an outer peripheral surface of the peripheral wall portion and is joined to an outer peripheral surface of the peripheral wall portion,
A ground wire connecting portion extends from the lower lid portion or the upper lid portion, a conductive sheet is interposed between the ground wire connecting portion and the peripheral wall portion, and between the outer peripheral portion and the peripheral wall portion, A flexible container in which a base portion of the conductive sheet is sandwiched and joined to the outer peripheral portion and the peripheral wall portion. Of the conductive sheet, other than the base portion is a free piece extending from the outer peripheral portion,
The flexible container according to claim 1, wherein the extension length of the free piece is smaller than the extension length of the ground wire connecting portion. 3. The flexible container according to claim 1, wherein the ground wire connecting portion has a lateral width that is larger on the proximal side than on the distal side. A flexible container formed by joining a peripheral wall portion made of a conductive tarpaulin, a lower lid portion and an upper lid portion,
The conductive tarpaulin has a non-conductive resin layer formed on the front surface and a conductive resin layer formed on the back surface,
The conductive tarpaulin is provided with the conductive resin layer as the inner side of the flexible container,
In a flexible container in which the outer peripheral portion of the conductive tarpaulin forming the lower lid portion or the upper lid portion extends along the outer peripheral surface of the peripheral wall portion, and is joined to the outer peripheral surface of the peripheral wall portion,
A ground wire connecting portion extends from the lower lid portion or the upper lid portion,
The flexible container is characterized in that the left and right widths of the ground wire connecting portion are larger on the proximal side than on the distal side. The flexible container according to claim 4, wherein the ground wire connection portion has a trapezoidal shape. A method of manufacturing a flexible container according to any one of claims 1 to 3, comprising:
Sandwiching the base portion of the conductive sheet between the conductive tarpaulin forming the peripheral wall portion and the outer peripheral portion of the conductive tarpaulin forming the lower lid portion or the upper lid portion, the peripheral wall portion, and the base portion of the conductive sheet, A method of manufacturing a flexible container, comprising a step of high-frequency welding a lower lid portion or an upper lid portion.

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