Flexible container bag

Abstract

To provide a flexible container bag which prevents leakage of a storage object from a sewing part.SOLUTION: A flexible container bag 1 comprises a body part 11, a hanging belt 15, and a first internal sheet 21. The body part 11 has a trunk part 12 made of a sheet formed into a cylindrical shape, and a bottom part 13 made of a sheet that closes one opening of the cylindrical shape of the trunk part 12. The bottom part 13 is connected to the body part 12 by sewing. The hanging belt 15 is connected to the trunk part 12 by sewing, and belt sewing parts 16 are provided on an opposite side to the bottom part 13 from the middle of the length of the trunk part 12. A first internal sheet 21 is provided inside the body part 11, and one end edge in a longitudinal direction of the trunk part 12 is positioned closer to the bottom part 13 than the belt sewing parts 16 and fixed to the trunk part 12, and has a length that exceeds the length from the position fixed to the trunk part 12 to the sewing part between the bottom part 13 and the trunk part 12.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a flexible container bag, and particularly to a flexible container bag that suppresses leakage of an object to be stored from a sewn portion.

Background Art

[0002] A flexible container bag is a bag-shaped packaging material for storing objects to be stored such as soil, sand, and other powders and granular materials for storage and transportation. A flexible container bag is generally manufactured by sewing a bottom sheet to one opening of a cylindrical body sheet (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a flexible container bag manufactured by sewing a bottom sheet to one opening of a cylindrical body sheet, when the object to be stored is pushed outward by the internal pressure when the object to be stored is stored, the object to be stored such as powder may leak from the sewn portion between the body sheet and the bottom sheet.

[0005] In view of the above problems, the present disclosure relates to providing a flexible container bag that suppresses leakage of an object to be stored from a sewn portion.

Means for Solving the Problems

[0006] A flexible container bag according to one aspect of the present disclosure has a body portion having a body formed by a sheet in a cylindrical shape, and a bottom portion formed by a sheet closing one of the openings of the cylindrical shape in the body portion, the bottom portion being connected to the body portion by sewing, and a first inner sheet provided inside the body portion, the first inner sheet being fixed to the body portion and having a length exceeding the length from the position fixed to the body portion to the sewing portion between the bottom portion and the body portion. Further, it includes a suspension belt connected to the body portion by sewing, the belt sewing portion which is the sewing position of the suspension belt to the body portion being provided on the side opposite to the bottom portion rather than the middle of the length of the body portion, and one end side of the first inner sheet in the length direction of the body portion may be disposed on the side of the bottom portion rather than the belt sewing portion.

[0007] When configured in this way, when the contents are contained, the sewing portion between the bottom portion and the body portion is covered by the first inner sheet, so that the contents do not directly hit the sewing portion, and leakage of the contents from the sewing portion can be suppressed.

[0008] Further, as a flexible container bag according to another aspect of the present disclosure, in the flexible container bag according to the above aspect, an end portion of the first inner sheet extending beyond the sewing portion between the bottom portion and the body portion may be a free end.

[0009] When configured in this way, leakage of the contents from the sewing portion can be suppressed with a simple configuration.

[0010] Further, as a flexible container bag according to another aspect of the present disclosure, in the flexible container bag according to each of the above aspects, the first inner sheet may be provided with tacks formed by partially overlapping the first inner sheet in the circumferential direction of the cylindrical shape of the body portion at the portion fixed to the body portion.

[0011] When configured in this way, it is possible to prevent the first inner sheet from being turned up from the body portion.

[0012] Further, as a flexible container bag according to another aspect of the present disclosure, in the flexible container bag according to one aspect of the present disclosure, the first inner sheet may be formed in a bag shape that is closed in a state of covering the bottom using a liquid-proof material.

[0013] With this configuration, even when liquid is present inside or outside the first inner sheet, it is possible to prevent the liquid from passing back and forth between the inside and outside of the first inner sheet.

[0014] Further, as a flexible container bag according to another aspect of the present disclosure, in the flexible container bag according to each of the above aspects, a suspension belt connected to the body portion by sewing, and a second inner sheet provided inside the main body portion, which is fixed to the body portion on the side opposite to the bottom with respect to the sewing position of the suspension belt to the body portion, and has a length exceeding the length from the position fixed to the body portion to the sewing portion of the body portion and the suspension belt.

[0015] With this configuration, it is possible to suppress the leakage of the contents from the connection portion of the suspension belt.

[0016] Further, as a flexible container bag according to another aspect of the present disclosure, in the flexible container bag according to each of the above aspects, the end of the first inner sheet on the side fixed to the body portion may be folded back and overlapped and fixed to the body portion.

[0017] With this configuration, it is possible to suppress the first inner sheet from being turned up from the main body portion.

[0018] Further, as a flexible container bag according to another aspect of the present disclosure, in the flexible container bag according to each of the above aspects, a superimposing member may be provided on the first inner sheet at a position where the first inner sheet is fixed to the body portion. Here, the superimposing member is typically a patch having a predetermined length in the axial direction of the cylindrical body portion, but may be formed of resin or metal. Further, it may be in a shape (length) that overlaps the first inner sheet over the entire circumference of the cylindrical body portion, or may be in a shape (length) that is intermittently provided in the circumferential direction.

[0019] With this configuration, it is possible to suppress the first inner sheet from being turned up from the main body portion.

[0020] Further, as a flexible container bag according to another aspect of the present disclosure, in the flexible container bag according to each of the above aspects, as a line where the first inner sheet is fixed to the body portion, a main line extending in the circumferential direction of the cylindrical body portion and a plurality of short lines shorter than the main line provided in the vicinity of the main line at a predetermined interval in the circumferential direction may be provided.

[0021] With this configuration, it is possible to suppress the first inner sheet from being turned up from the main body portion.

[0022] Further, as a flexible container bag according to another aspect of the present disclosure, in the flexible container bag according to each of the above aspects, the line where the first inner sheet is fixed to the body portion may extend in a curve or a broken line in the circumferential direction of the cylindrical body portion.

[0023] With this configuration, it is possible to suppress the first inner sheet from being turned up from the main body portion.

[0024] Also, as a flexible container bag according to another aspect of the present disclosure, in the flexible container bag according to each of the above aspects, a line where the first inner sheet is fixed to the body portion extends in the circumferential direction of the cylindrical body portion with a predetermined width, and the predetermined width is the length of the cylindrical body portion in the axial direction, and the portion of the first inner sheet on the bottom side of the line near the line can be brought closer to the body portion so as to follow the body portion.

[0025] With this configuration, it is possible to suppress the first inner sheet from being turned up from the main body portion.

Advantages of the Invention

[0026] According to the present disclosure, when the contents are contained, the sewing portion between the bottom portion and the body portion is covered by the first inner sheet, so that the contents do not directly hit the sewing portion, and leakage of the contents from the sewing portion can be suppressed.

Brief Description of the Drawings

[0027]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0028] Hereinafter, embodiments will be described with reference to the drawings. In each figure, members that are identical or corresponding to each other are denoted by the same or similar reference numerals, and redundant descriptions are omitted.

[0029] First, with reference to FIG. 1, a flexible container bag 1 (hereinafter referred to as "flexi-con bag 1") according to an embodiment will be described. FIG. 1 is a perspective view of the flexi-con bag 1. The flexi-con bag 1 is a bag for storing and transporting an object to be stored (hereinafter sometimes referred to as "contents") in, for example, the construction and civil engineering industries, waste treatment industries, recycling industries, manufacturing industries, agricultural industries, etc. Examples of the object to be stored in the flexi-con bag 1 include soil, waste products, cuttings, powders, granular materials, etc., but various other objects may be used as long as they can be stored. Examples of the powders and granular materials stored in the flexi-con bag 1 include cement, mineral products such as fine sand, industrial products such as red iron oxide powder and coloring raw material powder, wheat flour, starch, rice grains, etc.

[0030] The flexible container bag 1 is flexible and can be folded. Therefore, when not in use, it can be folded and stacked for storage. Also, since the flexible container bag 1 is provided with a suspension belt 15, it can be lifted and transported by a forklift or a crane. The flexible container bag 1 has a main part (main body part 11) that constitutes the bag body, which is formed by sewing a properly cut sheet. Generally, when a flexible container bag is lifted, a force acts in the direction in which the flexible container bag expands due to the weight and internal pressure of the contents stored inside. At this time, the seams of the sewing part of the flexible container bag spread, and when the contents are powders or granular materials with a small particle size, the contents may leak out from the spread seams. The flexible container bag 1 according to the present embodiment can prevent or reduce the leakage of the contents even when the seams spread due to the weight of the contents by the configuration described later. Hereinafter, the configuration of the flexible container bag 1 will be described. The flexible container bag 1 includes a main body part 11, a suspension belt 15, a lower sheet 21, and an upper sheet 22.

[0031] The main body part 11 constitutes the main part of the flexible container bag 1 and has a body part 12 and a bottom part 13. The body part 12 is formed of a tubular sheet. The body part 12 may be formed by cutting a long sheet formed into a tubular shape to a required length, or may be formed by joining a pair of opposite sides of a rectangular sheet to form a tubular shape. The body part 12 alone has open ends on both sides of the tubular shape. The bottom part 13 closes one end face of the body part 12 formed in a tubular shape with both end faces open. The bottom part 13 is typically formed of a sheet of the same material as the body part 12. By attaching the bottom part 13 to one open end face of the body part 12, a bag-shaped main body part 11 is formed. The bottom part 13 can adopt various shapes according to the intended shape of the flexible container bag 1. For example, when the main body part 11 is a cylindrical bag (so-called round type), the bottom part 13 is formed in a circular shape, and when the main body part 11 is a rectangular parallelepiped-shaped bag (so-called square type), the bottom part 13 is formed in a rectangular shape (square or rectangle). In addition to being circular or rectangular, the bottom part 13 may be polygonal such as an ellipse, a hexagon, or an octagon, or may be a rhombus or any other arbitrary shape.

[0032] The sheet forming the body part 12 and the bottom part 13 is made of a material that can impart flexibility to the main body part 11, and typically a woven fabric made of polypropylene is used. By having flexibility, the sheet can be folded. Also, by using a woven fabric woven vertically and horizontally with wide threads made of polypropylene, the sheet has the strength (such as tensile strength) required for the flexible container bag 1. Since it is difficult to weld or bond a polypropylene sheet with the strength required for the flexible container bag 1, in the flexible container bag 1 according to the present embodiment, the body part 12 and the bottom part 13 are joined by sewing. Specifically, the outer periphery of the bottom part 13 is sewn over the entire circumference of one open end of the body part 12. As the sewing thread for joining the body part 12 and the bottom part 13, typically a polyester thread is used, but threads of other suitable materials such as threads of synthetic resins or hemp threads may also be used. Note that since the flexible container bag 1 has flexibility, it cannot stand on its own (stand upright) as shown in FIG. 1 when there is no support or when it is not filled with contents. However, in FIG. 1, for the sake of explanation, it is shown in a self-standing state.

[0033] The suspension belt 15 is a belt-shaped member provided for lifting the flexible container bag 1 with a forklift or a crane. The suspension belt 15 is a long belt having a strength (such as tensile strength) capable of withstanding the lifting of the flexible container bag 1 filled with the planned contents. The suspension belt 15 is typically formed of polypropylene, but may be formed of a synthetic resin other than polypropylene or a material other than a synthetic resin. In the present embodiment, two sets of the suspension belts 15 are attached to the main body portion 11. In the present embodiment, each suspension belt 15 has an intermediate position of its length disposed on the side of the opening end face of the main body portion 11, and is sewn and fixed to the side surface of the body portion 12 at positions separated from the intermediate position in the directions of both ends. The portion where the suspension belt 15 is fixed to the body portion 12 is referred to as a "belt sewing portion 16". Note that the fixing of the suspension belt 15 to the body portion 12 may be performed by a method other than sewing as long as the required strength can be ensured. The end side of the suspension belt 15 rather than the belt sewing portion 16 extends along the side surface of the body portion 12 in the cylindrical axial direction of the body portion 12, then bends and extends along the surface of the bottom portion 13 toward the centroid of the bottom portion 13. In the present embodiment, the end of the suspension belt 15 does not reach the centroid of the bottom portion 13 and is located between the centroid of the bottom portion 13 and the outer peripheral edge, and is fixed to the bottom portion 13 at that position. The fixing of the end of the suspension belt 15 to the bottom portion 13 is typically performed by sewing, but may be performed by a method other than sewing. The flexible container bag 1 according to the present embodiment has four belt sewing portions 16.

[0034] The four belt sewing portions 16 are typically arranged at equal intervals in the circumferential direction of the cylindrical body portion 12. Further, the four belt sewing portions 16 are each typically arranged on the side of the opening of the main body portion 11 rather than the middle of the length of the body portion 12 (the distance between both end faces of the cylinder) in the cylindrical axial direction of the body portion 12. The position of each belt sewing portion 16 in the cylindrical axial direction of the body portion 12 (based on the centroid of the belt sewing portion 16) may be, for example, at a position of 1 / 5 to 1 / 3 of the length of the body portion 12 or at a position of 1 / 4 of the length of the body portion 12 from the end face on the side of the opening of the main body portion 11.

[0035] The lower sheet 21 is provided inside the main body 11 and covers the connection portion between the body portion 12 and the bottom portion 13 (hereinafter referred to as the "body-bottom connection portion 14"), corresponding to the first inner sheet. In this embodiment, a plastic film is used for the lower sheet 21. Since the film is a thin sheet, it is a form of sheet. As the material of the synthetic resin of the plastic film constituting the lower sheet 21, polyethylene, polypropylene, vinyl chloride resin, polyester, nylon, and various other materials can be used. The material of the lower sheet 21 may be appropriately determined in consideration of the strength according to the application, the connection mode to the main body 11, etc. If the same type of material as the material of the main body 11 (for example, polypropylene and / or polyethylene for the polypropylene main body 11) is used for the lower sheet 21, it will be easier to recycle the flexible container bag 1 after use, which is preferable. The thickness of the lower sheet 21 is not particularly limited, but from the viewpoint of weight reduction, it is preferably made as thin as possible within the range where the required strength can be ensured.

[0036] In this embodiment, a rectangular film is used for the lower sheet 21. The width of the lower sheet 21 has a length equal to or greater than the inner peripheral length of the cylindrical body portion 12. The length of the lower sheet 21 (the length in the direction orthogonal to the width and in the direction in which the axis of the cylindrical body portion 12 extends) has a length that at least exceeds the body-bottom connection portion 14 when the lower sheet 21 is fixed to the body portion 12 and arranged along the inside of the main body 11. It is preferable that the length of this lower sheet 21 has a length that can cover the portion of the suspension belt 15 fixed to the bottom 13. Also, the length of this lower sheet 21 may be a length extending about 100 mm to 300 mm in the direction of the centroid of the bottom 13 from the body-bottom connection portion 14 in a state where the main body 11 is filled with the content and the lower sheet 21 is in overall contact with the main body 11. Alternatively, instead of the absolute length, for example, when the bottom 13 is circular, it may be about 1 / 4 to 2 / 3, or about 1 / 3 to 1 / 2, of the diameter, and when the bottom 13 is square, it may be about 1 / 4 to 2 / 3, or about 1 / 3 to 1 / 2, of the side length, of the length extending in the direction of the centroid of the bottom 13 from the body-bottom connection portion 14.

[0037] The lower sheet 21 is fixed to the body portion 12 at one end side in the length direction or in the vicinity of the end side, in a state where the width direction is arranged along the cylindrical inner circumference of the body portion 12. The attachment position of the lower sheet 21 to the body portion 12 (the position in the cylindrical axial direction of the body portion 12) is a position where the end side opposite to the end side fixed to the body portion 12 comes to a position beyond the bottom body connection portion 14 as described above. The lower sheet 21 is typically fixed to the body portion 12 over the entire cylindrical inner circumference at the above-mentioned one end side. The lower sheet 21 is not fixed to the main body portion 11 except at the end side fixed to the body portion 12. The side of the lower sheet 21 opposite to the end side fixed to the body portion 12 is a free end. Therefore, the lower sheet 21 can be attached to the body portion 12 relatively easily, and can follow the deformation of the main body portion 11 without forming an unintended air pocket or the like when the main body portion 11 is deformed such as being folded. Note that the lower sheet 21 may be formed in a cylindrical shape in addition to being rectangular.

[0038] FIG. 2 is a schematic partial development view of the flexible container bag 1, showing the internal state of the flexible container bag 1. FIG. 2 partially shows a state where a part inside the flexible container bag 1 formed in a cylindrical shape in the present embodiment is developed so that the bottom body connection portion 14 is linear. As shown in FIG. 2, the lower sheet 21 is fixed to the body portion 12 by a fixing line 51 in the vicinity of one end side. Further, the end portion of the lower sheet 21 on the side opposite to the fixing line 51 side is freely movable without being restricted. The fixing line 51 is a line by which the lower sheet 21 is fixed to the body portion 12. The fixing line 51 is formed by sewing in the present embodiment, but may be formed by welding, an adhesive tape, an adhesive, or the like depending on the materials of the body portion 12 and the lower sheet 21. The fixing line 51 is formed over the entire cylindrical circumference of the body portion 12 as described above.

[0039] Figure 3 shows the partial details around the fixing line 51 of the lower sheet 21. In the present embodiment, the lower sheet 21 has a film partially overlapped in the width direction to form tacks (folds), and a plurality of these tacks are formed at appropriate intervals in the width direction and are sewn to the body portion 12. With this configuration, it is possible to prevent the lower sheet 21 from being turned up and the contents from being filled into the flexible container bag 1 in that state. If the lower sheet 21 is fixed to the body portion 12 with a thin fixing line 51 without tacks, the lower sheet 21 with the free end on the side opposite to the fixing line 51 may be turned up and the free end may remain positioned on the opening side of the flexible container bag 1. Such a state may occur while the flexible container bag 1 having flexibility is being folded or unfolded. On the other hand, in the flexible container bag 1 according to the present embodiment in which tacks are formed on the lower sheet 21, when the flexible container bag 1 is unfolded, due to the presence of the tacks, the free end of the lower sheet 21 extends toward the bottom 13. Therefore, it is possible to prevent the lower sheet 21 from remaining turned up. Note that even when the lower sheet 21 is attached to the body portion 12 with a plurality of tacks formed, it is preferable that both end sides in the width direction overlap so that the lower sheet 21 can cover the entire body bottom connection portion 14 without gaps.

[0040] Returning to FIG. 1, the description of the flexible container bag 1 will be continued. The upper sheet 22 is provided inside the main body portion 11 and covers the belt sewing portion 16 and corresponds to the second inner sheet. The mode in which the upper sheet 22 covers the belt sewing portion 16 is also shown in FIG. 2. Typically, the same material as that of the lower sheet 21 is used for the upper sheet 22, but another material that can be adopted as the lower sheet 21 may be used, or a material that is not adopted as the lower sheet 21 may be used. In the present embodiment, a rectangular film is used for the upper sheet 22. The width of the upper sheet 22 typically has a length equal to or greater than the inner peripheral length of the cylindrical body portion 12. The length of the upper sheet 22 (the length in the direction orthogonal to the width and the length in the direction in which the cylindrical axis of the body portion 12 extends) typically has a length equal to or greater than the length of the belt sewing portion 16.

[0041] In the present embodiment, the upper sheet 22 is disposed along the cylindrical inner circumference of the body portion 12 in a manner covering the belt sewing portion 16 from the inside of the body portion 12, and is fixed to the body portion 12 at least at the end edge on the opening side of the flexible container 1 or in the vicinity thereof. At this time, the position where the upper sheet 22 is fixed to the body portion 12 is between the end of the body portion 12 on the opening side of the flexible container 1 and the belt sewing portion 16. The side of the upper sheet 22 on the bottom portion 13 side rather than the belt sewing portion 16 is typically a free end. However, the upper sheet 22 may be connected to the main body portion 11 also on the bottom portion 13 side rather than the belt sewing portion 16, and may be connected to the main body portion 11 entirely or partially (including intermittently) in the length direction (the cylindrical axis direction of the body portion 12). Note that the upper sheet 22 can perform its function as long as it can cover each belt sewing portion 16. Therefore, the upper sheet 22 does not necessarily have a size that can cover all the belt sewing portions 16 collectively, and may have a size that can cover a plurality of belt sewing portions 16 individually or in any number. However, if the upper sheet 22 is configured to cover all the belt sewing portions 16 collectively, there is an advantage that an increase in the number of parts can be suppressed and complication of manufacturing can be suppressed.

[0042] When not in use, the flexible container bag 1 configured as described above is typically folded and stored. At this time, since the flexible container bag 1 has flexibility, it can change its shape relatively freely, can be stacked, and can be stored in a relatively small space. When using the flexible container bag 1, place the bottom 13 on the ground or the floor, etc., and lift the opening surface of the flexible container bag 1 vertically upward, and then the body portion 12 can be stretched. At this time, the suspension belt 15 may be used to stretch the body portion 12. When the body portion 12 is stretched in this way, the upper sheet 22 hangs down from the fixed portion to the body portion 12 toward the bottom 13 and covers each belt sewing portion 16. At this time, the upper sheet 22 typically hangs down along the body portion 12. Also, when the body portion 12 is stretched, the lower sheet 21 also hangs down from the fixed portion to the body portion 12 toward the bottom 13. Since the lower sheet 21 is provided with tacks, it can be prevented from turning up and not hanging down toward the bottom 13. When the body portion 12 is stretched, although the free end of the lower sheet 21 contacts the bottom 13, a gap may occur between the vicinity of the body bottom connection portion 14 and the lower sheet 21.

[0043] When the body portion 12 is extended as described above, the flexible container bag 1 is in a bag shape and can accommodate the contents. When the contents are put into the bag-shaped flexible container bag 1, the contents accumulate from the lower part of the flexible container bag 1. The contents put into the flexible container bag 1 spread up to the cylindrical inner wall of the body portion 12 when they accumulate. When the contents accumulate while spreading up to the inner wall of the body portion 12 inside the flexible container bag 1, the lower sheet 21 is pressed against the body portion 12 and the bottom portion 13 by the internal pressure of the contents, and the whole comes into contact with the body portion 12 and the bottom portion 13. In this way, since the lower sheet 21 is sandwiched between the contents and the body portion 12 and the bottom portion 13, the contents do not directly hit the body-bottom connection portion 14 (seam). Therefore, even if the contents are of a small particle size such as powder, leakage can be prevented. Also, when the contents accumulate and reach the height of the upper sheet 22, the upper sheet 22 is sandwiched between the contents and the belt sewing portion 16. Thus, since the contents do not directly hit the belt sewing portion 16, leakage from the belt sewing portion 16 can be prevented. The flexible container bag 1 filled with the contents can be stored as it is, or can be lifted and transported by a forklift or a crane using the suspension belt 15.

[0044] Note that the flexible container bag 1 can also be suitably applied to a "with discharge port" type in which a discharge port is formed in the bottom portion 13 in advance. The flexible container bag with a discharge port has a cut serving as the discharge port formed in the bottom in advance. At the time of inputting and transporting the contents, the bottom sheet with the cut closed and bundled is tied up with a string or the like, and the string or the like is untied at the time of discharging the contents to open the discharge port. In the flexible container bag 1 according to the present embodiment, the end side of the lower sheet 21 provided inside the main body portion 11, which is opposite to the side of the fixing line 51, is a free end and is open. Therefore, when the discharge port is opened, the contents can be smoothly discharged. When the flexible container bag 1 has a discharge port and there is a sewing line around the discharge port where the contents can leak, it is preferable to form the lower sheet 21 to a size that can cover the sewing line with the lower sheet 21 as well.

[0045] As described above, according to the flexible container bag 1 according to the present embodiment, since the lower sheet 21 is provided, leakage of the contents from the bottom connection portion 14 can be suppressed. Further, since the upper sheet 22 is provided, leakage of the contents from the belt sewing portion 16 can be suppressed. Further, the flexible container bag 1 according to the present embodiment has the following advantages in addition to the above. Compared with the method of putting an inner bag into a bag-shaped flexible container bag, an increase in cost can be suppressed. Further, compared with the method of sandwiching a cloth between the body portion and the bottom portion of the flexible container bag or the belt sewing portion, or the method of pressing the seam with a string, the leakage of the contents can be prevented more efficiently with a simpler configuration. When performing the sewing work during the production of the flexible container bag, since the work of attaching the lower sheet 21 and the upper sheet 22 may be added, it can be manufactured by a relatively simple additional work. Further, the flexible container bag 1 can also be suitably adapted to have a discharge port.

[0046] Next, with reference to FIG. 4, a flexible container bag 2 (hereinafter referred to as "flexible container bag 2") according to another embodiment will be described. FIG. 4 is a longitudinal sectional view for explaining the schematic configuration of the flexible container bag 2. Since the flexible container bag 2 is usually used in a state where the cylindrical axis of the body portion 12 extends vertically, a cross section parallel to the cylindrical axis of the body portion 12 in this normal usage mode is referred to as a longitudinal section. The flexible container bag 2 is mainly different from the flexible container bag 1 in that it includes a bottom covering sheet 25 instead of the lower sheet 21 (see FIG. 1) provided in the flexible container bag 1 (see FIG. 1) as the first inner sheet.

[0047] The bottom-covering sheet 25 corresponding to the first inner sheet is fixed to the body portion 12 and extends beyond the body-bottom connection portion 14. Further, the bottom-covering sheet 25 is shaped to cover the entire bottom portion 13 in addition to the lower portion of the body portion 12 inside the flexible container bag 2. In other words, the bottom-covering sheet 25 is formed in a bag shape with one end face closed, typically having substantially the same shape as the shape of the lower portion of the main body portion 11. Here, the substantially same shape means that when the contents put into the flexible container bag 2 are deposited inside the flexible container bag 2, the shape is the same to such an extent that no unnecessary gap is formed between the main body portion 11 and the bottom-covering sheet 25. Note that the unnecessary gap is a gap that would cause damage to the bottom-covering sheet 25 due to the force by which the contents existing inside the bottom-covering sheet 25 try to move towards the gap.

[0048] The bottom-covering sheet 25 is formed of a liquid-proof material. Here, having liquid-proof property means being in a state of having the performance of preventing the passage of liquid exceeding the allowable range in light of the use of the flexible container bag 2. As the material for forming the bottom-covering sheet 25, polyethylene, polypropylene, vinyl chloride resin, polyester, nylon, and other synthetic resins can be used. Also, as the material for forming the bottom-covering sheet 25, in addition to various synthetic resins, a woven fabric or a non-woven fabric coated with a liquid-proof material may be used.

[0049] The bottom-covering sheet 25 is fixed to the body portion 12 by a fixing line 51 at a position away from the portion covering the bottom portion 13 (typically near the end edges), similar to the lower sheet 21 (see FIG. 1). The distance from the body-bottom connection portion 14 to the fixing line 51 may be determined in consideration of the possible liquid depth in the environment where the flexible container bag 2 is placed. For example, when rainwater may accumulate up to 50 mm around the placed flexible container bag 2, the distance from the body-bottom connection portion 14 to the fixing line 51 may be set to a distance exceeding 50 mm. In this way, the distance from the body-bottom connection portion 14 to the fixing line 51 can be, for example, 30 mm, 50 mm, 100 mm, 150 mm, 200 mm according to the environment where the flexible container bag 2 is placed, and may also be a distance exceeding 200 mm. Alternatively, the distance from the body-bottom connection portion 14 to the fixing line 51 may be 1.1 to 2.0 times, preferably 1.2 to 1.5 times, or about 1.3 times the maximum liquid depth that may occur around the flexible container bag 2. Also, depending on the situation, a distance exceeding 2 times may be set.

[0050] The configuration of the flexible container bag 2 other than the above includes the provision of the suspension belt 15 and the upper sheet 22, and is the same as that of the flexible container bag 1 (see FIG. 1). The flexible container bag 2 configured in this way is such that the entire portion deposited at the lower part of the introduced contents is covered by the liquid-proof bottom-covering sheet 25. Therefore, even when a liquid such as rainwater accumulates around the flexible container bag 2, the contents introduced into the flexible container bag 2 can be protected from flooding (liquid immersion). Note that due to the structure of the flexible container bag 2, the contents to be introduced into the interior can also have a high liquid content ratio (the ratio of the liquid contained in the contents). In this case, the presence of the bottom-covering sheet 25 can prevent the liquid oozing out from the contents from leaking from the flexible container bag 2.

[0051] In the above description, it is assumed that the flexible container bags 1 and 2 are provided with the upper sheet 22. However, if leakage of the contents from the belt sewing portion 16 does not occur, the upper sheet 22 may be omitted. On the other hand, for example, when the body portion 12 is formed by sewing together a plurality of cylindrical sheets, a sheet that covers the joined portion from the inside may be provided in the same manner as the upper sheet 22.

[0052] In the above description, it is assumed that the sheet forming the body portion 12 and the bottom portion 13 is a woven fabric made of polypropylene. However, depending on the uses of the flexible containers 1 and 2, polyethylene or other synthetic resins may be used. Further, the sheet is not limited to a woven fabric and may be a non-woven fabric.

[0053] In the above description, it is assumed that the first inner sheet is the lower sheet 21 made of a plastic film. However, it may be composed of a plastic sheet thicker than the film, or may be a woven fabric or non-woven fabric other than the film. That is, in addition to being formed in a film shape by spreading a single material, the first inner sheet may use a woven fabric or non-woven fabric of a single or a plurality of materials (for example, a polypropylene / polyethylene woven fabric or non-woven fabric). The material is not limited to plastic, and natural materials such as cotton, wool, and hemp may be used. However, considering comprehensively the strength, flexibility, weight, etc., it is preferable that the first inner sheet is composed of a plastic film.

[0054] In the above description, the lower sheet 21 (the first inner sheet) and the upper sheet 22 (the second inner sheet) are separate and are individually fixed to the main body 11. However, a long sheet formed by integrating the lower sheet 21 and the upper sheet 22 may be used as a sheet that also serves as the first inner sheet and the second inner sheet. Similarly, when the bottom covering sheet 25 is provided instead of the lower sheet 21, a sheet formed by integrating the bottom covering sheet 25 and the upper sheet 22 may be used as a sheet that also serves as the first inner sheet and the second inner sheet. In this way, when the lower sheet 21 or the bottom covering sheet 25 and the upper sheet 22 are integrally formed, the body bottom connection portion 14 and the belt sewing portion 16 can be integrally covered. Therefore, when a material having airtightness and liquid-proofness is adopted as this integrally formed sheet, ventilation with the outside can be blocked, preventing water from getting wet from the outside and preventing the contents (powder) from leaking from the weave of the woven fabric of the main body 11. That is, in this case, the same effect as when the main body 11 is subjected to laminating (coating) processing can be achieved. Also, in either case where the lower sheet 21 or the bottom covering sheet 25 and the upper sheet 22 are integrally formed or separately formed, an inlet (not shown) may be integrally formed on the part corresponding to the upper sheet 22. The inlet is generally a flexible cylindrical member attached to the opening end of the main body 11 and extending upward (on the side opposite to the bottom 13). The inlet typically has the same contour (cylindrical circumference) as the body portion 12. Also, generally, since the inlet does not require the same strength as the main body 11, a relatively thin and lightweight material (for example, a woven fabric of polypropylene or polyethylene) is used, but other materials or the same material as the main body 11 may be used. The inlet is extended upward and used as a guide to guide the contents into the main body 11 when filling the main body 11 with the contents, and is bundled and functions as a lid for the main body 11 after the main body 11 is filled with the contents. When the part corresponding to the upper sheet 22 and the inlet are integrally formed, the length of the sheet portion may be the sum of the length available as the inlet and the length that can cover the belt sewing portion 16, and the middle part of the length may be fixed to the upper part of the body portion 12.

[0055] In the above description, it was assumed that the lower sheet 21 (the first inner sheet) was fixed to the body portion 12 with a plurality of tacks formed thereon. However, as a measure to prevent the lower sheet 21 from being turned up, it may be fixed to the body portion 12 in the manner shown below.

[0056] As an example, as shown in FIG. 5(A), the end edge of the lower sheet 21 on the side of the fixing line 51 may be folded back in the direction of the inside of the main body portion 11, and the two folded and overlapping films may be fixed to the body portion 12 together. By doing so, the film of the folded portion located inside the main body portion 11 can hold down the film extending toward the bottom portion 13, and it is possible to suppress the film extending toward the bottom portion 13 from being turned up.

[0057] As another example, as shown in FIG. 5(B), at the position where the lower sheet 21 is fixed, an overlapping member 53 may be placed on the lower sheet 21 from above, and then the overlapping member 53 and the lower sheet 21 may be fixed to the body portion 12 together. At this time, the end portion of the lower sheet 21 is sandwiched between the body portion 12 and the overlapping member 53. The overlapping member 53 is typically a pad having a predetermined width, but it may be a resin such as a film or a plastic sheet, or it may be a metal. The predetermined width here (the length in the direction orthogonal to the direction in which the fixing line 51 extends) is a width that can hold down the lower sheet 21 along the body portion 12, and can be set to an appropriate width according to the hardness of the lower sheet 21. Also, typically, as shown in FIG. 5(B), the overlapping member 53 is formed in an annular shape with an elongated rectangular member that can be placed on the lower sheet 21 over the entire circumferential shape of the cylindrical body portion 12. In addition, as shown in FIG. 5(C), the overlapping member 53 may be composed of a plurality of small pieces and these may be provided intermittently in the circumferential direction of the cylindrical body portion 12. As shown in FIG. 5(B) or FIG. 5(C), when the overlapping member 53 is used, the film extending toward the bottom portion 13 can be held down by the overlapping member 53, and it is possible to suppress the film extending toward the bottom portion 13 from being turned up.

[0058] As yet another example, as shown in FIG. 6(A), in addition to the fixed line 51 extending in the circumferential direction of the cylindrical body portion 12 described above, a fixed line 52 shorter than the fixed line 51 may be provided at intervals in the circumferential direction of the cylindrical body portion 12. Here, the fixed line 51 can be regarded as the main line and the fixed line 52 as the short line, respectively. The fixed line 52 is provided in the vicinity of the fixed line 51. The term "in the vicinity of the fixed line 51" as used herein includes contacting the fixed line 51. In the example shown in FIG. 6(A), the fixed line 52 is perpendicular to the fixed line 51, but it may have an arbitrary angle (e.g., 15°, 30°, 45°, 60°, 75°, etc.) with respect to the fixed line 51 or may be parallel to the fixed line 51. It is preferable that the portion of the fixed line 52 farthest from the fixed line 51 is as close as possible to the fixed line 51 within the range where the turning up of the lower sheet 21 can be appropriately suppressed. From such a viewpoint, the length of the fixed line 52 and the range of the vicinity of the fixed line 51 can be determined.

[0059] Alternatively, as shown in FIG. 6(B), the fixed line 51 may be extended in a curved shape in the circumferential direction of the cylindrical body portion 12. In the example shown in FIG. 6(B), the fixed line 51 has an irregular waveform curve, but it may also have a regular waveform curve such as a sine wave. Further, the fixed line 51 is not limited to a curved shape and may be a polygonal line. Examples of the polygonal line include a square wave shape, a triangular wave shape, and a sawtooth wave shape.

[0060] Alternatively, as shown in FIG. 6(C), the fixed line 51 may have a predetermined width. The predetermined width here is the width at which the portion of the lower sheet 21 in the vicinity of the fixed line 51 on the side of the bottom portion 13 rather than the fixed line 51 can bring the lower sheet 21 closer to the body portion 12 along the body portion 12. By making the width of the fixed line 51 thick like a band rather than thin like a line in this way, it is possible to suppress the lower sheet 21 from turning up away from the body portion 12 due to the elasticity of the lower sheet 21. By devising the fixed line 51 as shown in FIGS. 6(A) to 6(C), it is possible to suppress the film extending toward the bottom portion 13 from turning up.

[0061] The anti-curl measures shown in FIGS. 5(A) to 6(C) above can also be applied when fixing not only the lower sheet 21 but also the upper sheet 22, the long sheet, and the bottom covering sheet 25 to the main body 11.

Explanation of Signs

[0062] 1, 2 Flexible container bag (flexible container bag) 11 Main body 12 Barrel part 13 Bottom 15 Suspension belt 16 Belt sewing part 21 Lower sheet (first inner sheet) 22 Upper sheet (second inner sheet) 25 Bottom covering sheet (first inner sheet)

Claims

1. A main body portion includes a body portion formed of a sheet in a cylindrical shape and a bottom portion formed of a sheet that closes one of the cylindrical openings of the body portion, the bottom portion being connected to the body portion by sewing; A hanging belt connected to the torso by sewing, the hanging belt having a belt sewing portion, which is a sewing position of the hanging belt to the torso, provided on the opposite side of the bottom portion from the middle of the length of the torso; a first internal sheet provided inside the main body, one end side in the length direction of the torso being disposed closer to the bottom than the belt sewn portion and fixed to the torso, the first internal sheet having a length that exceeds a length from a position fixed to the torso to a sewn portion between the bottom and the torso; Flexible container bag.

2. A main body portion includes a body portion formed of a sheet in a cylindrical shape and a bottom portion formed of a sheet that closes one of the cylindrical openings of the body portion, the bottom portion being connected to the body portion by sewing; a first internal sheet provided inside the main body, the first internal sheet being fixed to the trunk portion and having a length that exceeds a length from a position fixed to the trunk portion to a sewn portion between the bottom portion and the trunk portion; The first internal sheet has a tuck formed by partially overlapping the first internal sheet in the cylindrical circumferential direction of the body portion at a portion fixed to the body portion. Flexible container bag.

3. The first inner sheet has an end portion extending beyond the sewn portion between the bottom portion and the body portion that is a free end. The flexible container bag according to claim 1 or 2.

4. The first internal sheet is made of a liquid-proof material and is formed into a bag shape that is closed in a state where it covers the bottom portion. The flexible container bag according to claim 1.

5. a second internal sheet provided inside the main body, the second internal sheet being fixed to the trunk on the opposite side of the belt sewing part from the bottom part, and having a length that exceeds a length from a position fixed to the trunk to a sewing part between the trunk and the hanging belt; The flexible container bag according to claim 1.

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