JP6822795B2 - Flexible container - Google Patents

Description

The present invention relates to a flexible container used for transporting and storing powders and granules.

Currently, in a wide range of industries, flexible containers are used to transport and store various substances, such as resin pellets, chemical products, inorganic substances, minerals, grains, powders such as feed, and liquids, regardless of their type and shape. It is used. The flexible container is basically attached to a tubular body having a cross-sectional shape of a circle or a quadrangle, a top surface and a bottom surface sewn to the upper and lower edges of the body, respectively, and the body. It consists of a hanging belt. A sealable input portion is provided in the central region of the top surface, and a sealable discharge portion is provided in the bottom central region as needed.

Flexible containers can be divided into running type containers, which are supposed to be used repeatedly for a long period of time, and cross type containers, which are supposed to be used only once for filling, or have a usage period of one year. being classified. The former running type container is mainly made of polyester fiber as a base cloth, and flexible soft vinyl chloride, EVA, polyurethane, rubber or the like is laminated on both the front and back surfaces thereof. On the other hand, the latter cloth-type container is mainly made of a woven fabric of polyolefin-based resin fiber and has no inner bag depending on the contents to be filled, and the cloth container has an inner bag inside.

In particular, for a cross-shaped container, when the contents are filled in the container, the dough of the body part extends in the circumferential direction, and the middle part of the tubular body part in the vertical direction bulges outward (hereinafter referred to as "body swelling"). ), The bulging part protrudes from the transportation pallet when viewed from above. If there is a bulge, when loading a flexible container into a truck or a marine container, the transportation pallets cannot be arranged without gaps on the loading platform, which causes a problem that the loading quantity decreases. In addition, it may cause the load to collapse, especially during stacking, and as a result, the flexible container may come into contact with or lean against the side wall of a truck or the like, making subsequent work difficult.

As a means for preventing body swelling, it has been proposed to provide partition walls for connecting adjacent side walls at four corners in a square tubular flexible container body as in Patent Document 1. However, a flexible container having such a partition wall not only requires a lot of labor and cost to manufacture, but also requires processing in the body such as suturing the partition wall. In addition, when the contents are filled, the partition wall blocks the inside of the body to make it difficult for the contents to flow in, and when the contents are discharged, the contents remain in the sutured portion of the partition wall, and then the contents become foreign substances when the contents are filled. There is also a concern that the partition wall and its sewn portion may be damaged. Further, when an inner bag is used for such a flexible container, there is a problem that it is difficult to attach the inner bag and the type of filling material is limited.

Further, as in Document 2, a flexible container in which a plurality of sheets constituting each side are formed into a multi-cylindrical shape by welding or sewing has been proposed, but in the first place, it takes time to process the flexible container according to this proposal. There is a problem that it takes time and effort and workability is poor. Further, there is also a problem that the body portion tends to swell due to the pressure from the inside to the outside of the seat portion due to the difference in the elongation ratio between the sewn portion and the seat portion.

Jitsukaisho 48-103441 JP-A-2002-128186

In view of the above circumstances, the present invention relates to a reduction in the filling amount due to the swelling of the flexible container, and a loss of storage space and safety resulting from the instability of the flexible container in the upper stage when stacking the flexible containers. It is an object of the present invention to provide a flexible container capable of stable stacking by solving the problem and increasing the filling efficiency while reducing the change in the filling shape.

The object is achieved according to one aspect of the present invention, a cylindrical side wall with a fill port in the opening direction one end side, sewn to the other end of the side wall, it is joined in a direction perpendicular to said direction by gluing or welding It has a body portion including a bottom surface and suspension belt support portions provided at at least two positions facing the side wall, and the plane shape of the bottom surface is quadrangular , and each side thereof is virtually represented. 3 equal parts, four equal parts, 6 equal parts or 8 equal portions, which portions corresponding to each corner of the square opposite ends of the respective sides are chamfered in a circular arc shape, the side wall, the An angle-corresponding band that reaches both ends of the side wall in parallel with the opening direction from each of the chamfered outer peripheral portions of the bottom surface is formed so as to be included in each of the corner-corresponding bands or around the corner-corresponding band. It is achieved by a flexible container characterized in that a first reinforcing band portion is provided so as to protrude in the direction, and the suspension belt support portion is provided on the surface of the first reinforcing band portion.

It said first reinforcing frame part can be configured in two rows, respectively. That is, the first reinforcing band portion of each of the two articles can be provided on all or part of the outer peripheral portion. In this case, the bottom end of each of the two first reinforcing strips is joined to the corner-corresponding strip , or the width direction of the end on the bottom of one or both of the two strips . It is preferable that at least a part of the corner-corresponding band is joined to the corner-corresponding band so as to protrude from both ends in the circumferential direction.

In the side wall, between the first reinforcing band portions adjacent to each other, the second reinforcing band portion is parallel to the opening direction of the side wall so as to divide the side wall between them into a plurality of equal parts in the circumferential direction. Can be provided in a strip shape. In this case, it is preferable that the tensile strength characteristic of the second reinforcing band portion at least along the opening direction of the side wall is set to be relatively smaller than that of the first reinforcing band portion.

On one end side of the side wall in the opening direction, a top surface having the same shape and size as the bottom surface is formed in a direction orthogonal to the direction, and the filling port provided in the central region thereof is relatively larger than the opening size of the side wall. Can be set to a small size.

Instead of the top surface, a frame having the same shape and size as the outer circumference of the bottom surface can be detachably arranged on one end side of the side wall in the opening direction in a direction orthogonal to the top surface. In this case, the frame body can be provided with a structure such as an integrated type or a split fitting type. Further, the frame body can be configured so that the outer circumference thereof can be expanded or contracted to a circumference substantially equal to or slightly larger than the outer circumference of the side wall. Such an expandable / contractible structure can be obtained, for example, by using a band-shaped shape memory alloy or the like as a constituent material, or by arranging a spring or a leaf spring in at least a part of the frame body.

In the flexible container of the present invention, a substantially polygonal bottom surface is provided on one end side of the tubular side wall in the opening direction, and a plurality of first reinforcing bands are provided on the side wall at predetermined intervals in the circumferential direction. It is possible to suppress the swelling of the body, reduce the change in the filling shape, improve the filling efficiency, and enable stable stacking.

It is a perspective view which shows the 1st Embodiment of the flexible container of this invention. It is a bottom view of the embodiment shown in FIG. It is a perspective view which shows the 2nd Embodiment of the flexible container of this invention. It is a side view of the embodiment shown in FIG. It is a top view and the bottom view of the embodiment shown in FIG. It is a perspective view which shows the 3rd Embodiment of the flexible container of this invention. It is a perspective view which shows the 4th Embodiment of the flexible container of this invention.

Next, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In each of the following figures, the same or common parts are designated by the same reference numerals, and duplicate description will be omitted unless otherwise required.

1st Embodiment FIG. 1 is a perspective view which shows 1st Embodiment of the flexible container of this invention, and FIG. 2 is a bottom view of the embodiment shown in FIG. As shown in these figures, the flexible container 1 of the present embodiment has an upper fully open type tubular side wall 12 having a filling port 10b that opens upward toward the drawing, and an opening of the side wall 12 on the lower side. A body portion 10 having a substantially square bottom surface 15 provided in a direction orthogonal to the direction and suspension belt support portions 17, 17, ... Arranged on the side wall 12 is provided. In the present embodiment, since the filling port 10b also serves as a discharge port, the filling port 10b is referred to as a “filling / discharging port 10b”) (the same applies to the fourth embodiment shown in FIG. 7).

The side wall 12 is a tubular body made of a flexible material, and the filling / discharging port 10b is provided with a flexible tubular cover material 10a having substantially the same outer peripheral length. The tubular body 12 may be seamless, or may be formed by winding one sheet material and joining the ends to form a tubular shape, and the outer peripheral length thereof is the outer circumference of the bottom surface 15 described later. It is set to be approximately the same as the length. Further, the height of the side wall 12 can be appropriately set in consideration of the design filling amount of the flexible container of the present invention, the planar shape of the bottom surface 15, and the like.

The flexible material of the tubular body 12 is not particularly limited, and various materials used in conventionally known cloth-type and running-type containers can be used. Specific examples of the former include yarn fabrics obtained by weaving flat yarns made of polyolefin resins such as polyethylene and polypropylene as warp yarns and weft yarns with a loom. Specific examples of the latter include ethylene vinyl acetate copolymer (EVA), polyvinyl chloride (PVC), various rubbers, and woven fabrics such as polyethylene. Any of these can be preferably used.

As an example of the planar shape of a quadrangle in which each corner is chamfered, the bottom surface 15 is a substantially quadrangular planar shape in which each corner of the quadrangle is chamfered in an arc shape, as shown in FIG. The outer peripheral portion formed by chamfering at the corner is represented by reference numeral 15a). The bottom surface 15 is joined to one open end of the side wall 12 by a method such as stitching, adhesion, or welding, and is arranged in a direction orthogonal to the opening direction so as to close one end of the side wall 12 in the opening direction. The planar shape of the bottom surface is a quadrangle in the present specification, but in addition to this, a (2n + 2) square (n value) such as a hexagon, an octagon, a decagon, or a dodecagon whose corners are chamfered. Can also be 2 to 5). The value of n is preferably set as small as possible within the above range. This is because when the n value is increased, the cross section of the side wall eventually approximates a circle, and the dead space increases in relation to the shape of the pallet.

The ratio of the total length of the outer peripheral portion 15a formed by the chamfer to the outer peripheral length of the bottom surface 15 is usually about 20 to 62% in consideration of the design filling amount and the improvement of the filling efficiency of the flexible container of the present embodiment. Is set to. In the case of the flexible container of the present embodiment, this ratio can be obtained, for example, based on the following concept. The plane shape of the bottom surface 15 before chamfering is assumed to be a square with a side of 1050 mm, and each side is virtually divided into 3, 4, 6 and 8 equal parts, respectively. Of the 9, 16, 36, and 64 squares obtained in each case, only the outer two sides (outer circumference) of the squares located at the four corners of the bottom surface are chamfered in an arc shape. And. Assuming that the outer peripheral portion formed by chamfering each corner is a quadrant, the total length of the outer peripheral portion of the four corners is the length of the circumference. On the other hand, the total circumference of the bottom surface is obtained by adding the sum of the lengths of the linear outer peripheral portions to the circumference. For example, when each side of the bottom surface 15 is divided into three equal parts, the length of the outer peripheral portion 15a formed by chamfering is 2198 mm, and the total peripheral length of the bottom surface is 3598 mm, so that the ratio is 61.1%. .. Further, when each side of the bottom surface 15 is divided into four equal parts, the length of the outer peripheral portion 15a formed by chamfering is 1649 mm, and the total peripheral length of the bottom surface is 3749 mm, so that the ratio is 44%. .. Similarly, the ratio when each side is divided into 6 equal parts is 28.2%, and the ratio when each side is divided into 8 equal parts is 20.7%. If the ratio is further divided into equal parts and the ratio is reduced, the planar shape of the bottom surface 15 becomes a quadrangle, and the size of the cross section of the flexible container of the present embodiment approximates that of the pallet on which the flexible container is placed. Is ideal, but there is a high possibility that the portion of the side wall 15 other than the portion corresponding to each corner of the bottom surface 15 protrudes from the pallet when viewed from above due to the body swelling. Further, when filling the contents, a space in which the contents are difficult to be filled is created in the vicinity of each corner of the bottom surface 15, and as a result, the filling efficiency is lowered. On the other hand, when it is divided into two equal parts with less than three equal parts, the planar shape of the bottom surface 15 becomes circular (the cross-sectional shape of the side wall is circular), and the dead space becomes large in relation to the pallet, which is not preferable.

Note that FIGS. 1 and 2 show a mode in which each corner of the bottom surface is chamfered in an arc shape, but the chamfered shape is not limited to this, and may be, for example, an elliptical shape or a parabolic shape. Further, not only such a continuous outer peripheral shape but also an intermittent outer peripheral shape in which a plurality of bent portions parallel to the opening direction of the side wall 12 are repeatedly provided may be used. Further, the bottom surface 15 can be made of a sheet material of the same type or different type as the side wall 12 (hereinafter, may be referred to as a bottom surface material). Further, the planar shape of the bottom surface 15 is not limited to a substantially quadrangle as shown in FIGS. 1 and 2, and is a substantially hexagon (n = 2) and a substantially octagon (n = 3) whose corners are chamfered as described above. , A substantially decagon (n = 4) and a substantially dodecagon (n = 5) can be formed as described above .

A portion 12a of the side wall 12, which has a strip shape parallel to the opening direction and has an end portion joined to an outer peripheral portion 15a, 15a, 15a, 15a formed by chamfering each corner of the bottom surface 15 on the bottom surface side thereof. In 12a, 12a, 12a (for convenience, this portion will be referred to as a "corner-corresponding band portion"), the first reinforcing band portions 13 and 13 of Article 2 are parallel to each other (in the opening direction of the side wall 12), respectively. It is provided in. Each of the first reinforcing band portions 13 can be joined by including the end portion thereof in the outer peripheral portion 15a of the bottom surface 15 or protruding from the outer peripheral portion 15a in the circumferential direction. The joint position of the first reinforcing band portion 13 is greatly affected by the shape and size of the chamfered corners (the shape and size of the outer peripheral portion formed by the chamfering) and the width of the first reinforcing band portion 13. Because. In particular, the first reinforcing band portion 13 is joined so that the end portion on the bottom surface side partially protrudes from the outer peripheral portion 15a, that is, at least a part of the end portion in the width direction is joined to the outer peripheral portion 15a and the remaining portion. Is preferably arranged so as to protrude from the outer peripheral portion 15 in the circumferential direction. in this way,

There is no particular limitation on the form of reinforcement in each of the first reinforcing band portions 13. For example, it can be reinforced by suturing, welding or adhering the same or different sheet materials to the front surface or the back surface of the side wall 12. As a result, the strength characteristics (particularly the tensile strength characteristics) of the first reinforcing band portion 13 in the opening direction or the circumferential direction of the side wall 12 along the surface of the side wall 12 are improved, and the above-mentioned respective of the first reinforcing band portions 13 Elongation in the direction is suppressed. Further, in the case of the above-mentioned yarn fabric, as another form of reinforcement, the first reinforcing band portion 13 may be reinforced by additional weaving of flat yarn. The number of warp threads parallel to the opening direction of the side wall 12 arranged within the width of the first reinforcing band portion 13 is relatively increased compared to that of the warp threads of the same width of the side wall 12 other than the first reinforcing band portion 12. The warp yarns in which the increased amount is dispersed within the width and stacked are woven with the weft yarns in the direction orthogonal to the direction of the side wall 12 to form the first reinforcing band portion 13. Further, in the yarn fabric, as a form of reinforcement other than the additional weaving, the warp threads arranged in the first reinforcing band portion 13 are narrowed in width and folded into the weft threads without lap weaving to reduce the number of warp threads per width. Rather than increasing the number of warp yarns arranged in the first reinforcing band portion 13, the thickness thereof may be increased relative to that of the weft yarns to reinforce the yarns. The width of the side wall 12 of each of the first reinforcing strips 13 in the circumferential direction can be appropriately set according to the form. For example, when reinforcing by the former flat yarn additional weaving, the width of the first reinforcing band portion 13 is usually set to 50 to 200 mm, and the number of warp threads within the set width is set to the first reinforcing band portion. The warp threads of the same width of the side wall 12 other than 13 are relatively increased by 30 to 100%, and the increased amount is dispersed within the width and the warp threads are woven together with the weft threads to form the first reinforcing band portion 13. It is preferable to form. If the ratio of the number of warp threads is set to less than the above range, it becomes difficult for the side wall 12 to maintain the shape of the bottom surface 15. The first reinforcing band portion 13 reinforced by the additional weaving in this way has improved strength characteristics (particularly tensile strength characteristics) in the opening direction of the side wall 12 along the surface of the side wall 12, and the first reinforcing band portion 13 The elongation in each of the above directions is suppressed.

In the example shown in FIG. 1, as described above, the configuration in which the first reinforcing band portions 13 and 13 of the two strips are joined to the outer peripheral portion 15a of each corner of the bottom surface 15 is shown. 12a may be configured to be provided with the first reinforcing band portion 13 of each one. It can be appropriately set whether the first reinforcing band portion 13 is provided with two or more strips or only one strip in each corner corresponding band portion 12a.

As described above, when the bottom surface 15 has a planar shape of the hexagon or more described above, the first reinforcing band portion 13 is located on the side wall 12 at a position corresponding to all or a part of the outer peripheral portions 15a of each corner of the bottom surface 15. Can be provided in. Here, the case where it is provided at a position corresponding to a part of the corner means that the first reinforcing band portion 13 is provided at a position where the suspension belt support portion 17 is arranged on the side wall 12, for example. That is, even when the plane shape of the bottom surface has a plane shape of hexagon or more, the first reinforcing band portions 13, 13, 13 are formed on the outer peripheral portions 15a, 15a, 15a, and 15a of at least four corners, respectively. , 13 may be provided.

Both ends of the band-shaped suspension belt support portion 17 are sewn to the adjacent first reinforcing band portions 13 of the two strips so as to bridge them toward the filling port 10b, and the intermediate portion extends to the filling port 10b side. It is formed in a U shape. As the suspension belt support portion 17, for example, a material of the same type as the suspension belt 18 described later can be used.

The suspension belt 18 is formed in a loop shape by folding both ends thereof and suturing them in the intermediate region of the belt, and the loop end 18a is connected to the suspension belt support portion 17. Both ends (loop ends) 18a and 18a of the suspension belt 18 are connected to the suspension belt support portions 17 and 17 arranged at positions corresponding to the two corners of the bottom surface 15, respectively, and correspond to the remaining two corners. Another suspension belt 18 is connected to the suspension belt support portions 17 and 17 arranged at the positions. As the material of the suspension belt 18, various conventionally known materials can be used.

As described above, in the first embodiment, the bottom surface 15 has a substantially quadrangular planar shape to be approximated to the planar shape of the pallet on which the flexible container of the present embodiment is placed, and corresponds to the outer peripheral portions 15a of each corner of the side wall 12. Since it was decided to join the ends of the first reinforcing band portions 13, 13, ... On the bottom surface side to the position (corner-corresponding band portion), the opening direction of the side wall 12 after filling the contents and the opening direction of the side wall 12 at this reinforcing portion. By reducing the elongation in the circumferential direction, the occurrence of body swelling can be suppressed, and as a result, the change in the filling shape of the body 10 is small (without significantly changing the cross-sectional shape of the body 10), and high filling efficiency is achieved. can get. In addition, stable stacking is possible, work efficiency is improved, and safety problems are less likely to occur.

2nd Embodiment FIG. 3 is a perspective view showing a second embodiment of the flexible container of the present invention, FIG. 4 is a side view of the embodiment shown in FIG. 3, and FIG. 5 is a plan view and a bottom surface of the embodiment shown in FIG. It is a figure. As shown in these figures, the substantially rectangular parallelepiped body portion 10 of the flexible container 2 of the second embodiment is formed on the side wall 12 and one end side (upper side toward the drawing) in the opening direction thereof, and is formed in the central region thereof. It is mainly composed of a top surface 11 having a filling port 20 and a bottom surface 15 formed on the other end side in the opening direction (lower side toward the drawing) and having a discharge port 26 in the central region thereof. The bottom surface 15 has the same shape and size as that of the first embodiment. The configurations other than these parts are substantially the same as those in the first embodiment.

As shown in FIGS. 3 to 5, the top surface 11 has a substantially quadrangular planar shape having the same shape and size as the bottom surface 15, that is, a planar shape in which each corner of the quadrangle is chamfered in an arc shape (this chamfered surface). Reference numeral 11a is attached to the outer peripheral portion of the corner.) The top surface 11 is joined to the opening end portion of the side wall 12 opposite to the bottom surface 15 by a method such as stitching, adhesion, or welding , so that the top surface 11 is arranged in a direction orthogonal to the opening direction of the side wall 12. Assuming that the outer peripheral portion 11a formed by chamfering the top surface 11 is, for example, a quadrant, the radius thereof is relative to the outer circumference of the top surface 11 in consideration of improvement in filling amount and filling efficiency, as in the case of the bottom surface 15. The ratio can be set in the range of 10 to 15%, preferably 12 to 14%. The top surface 11 can be made of a sheet material of the same type or different type as the side wall 12 (hereinafter, may be referred to as a top surface material).

The central region of the top surface 11 is provided with a filling port 20 (see FIG. 5) that penetrates inside and outside and is formed to have a size relatively smaller than the opening size of the filling / discharging port 10b in the first embodiment. .. A skirt 21 extends outward from the filling port 20, and ties 22 and 23 are attached to the skirt 21 for squeezing and sealing the skirt 21. Further, in order to cover the sealed skirt 21 from above and around it, an upper lid (upper lid retainer) 11b provided with an upper lid rope 14 is provided around the skirt 21.

In the central region of the bottom surface 15, a discharge port 26 (see FIG. 5) having a size substantially equal to that of the filling port 20 is provided so as to penetrate inside and outside. A skirt 27 extends outward from the outlet 26, and a tie string 28 is attached to the skirt 27 to squeeze and seal the skirt 27. Further, in order to cover the sealed skirt 27 from the lower side and the surroundings and fit it in the body 10, a lower lid (lower lid holder) 15b provided with a lower lid rope 25 is provided around the skirt 27. Has been done.

In the second embodiment, as described above, the top surface 11 and the bottom surface 15 have a substantially quadrangular planar shape having the same shape and the same size, and the side walls 12 have the first reinforcing bands 13, 13 as in the first embodiment. Since it was decided to provide, ..., the occurrence of body swelling can be suppressed by reducing the elongation of the side wall 12 in the opening direction and the circumferential direction after filling the contents with this reinforcing portion, and as a result, the body portion 10 is further provided. The flexible container of the present invention with a small change in filling shape and high filling efficiency can be obtained. In addition, stable stacking is possible, work efficiency is improved, and safety problems are less likely to occur.

Third Embodiment FIG. 6 is a perspective view showing a third embodiment of the flexible container of the present invention. In the third embodiment, the second reinforcing band portions 30, 30, ... Are provided between the adjacent first reinforcing band portions 13, 13 in the angle-corresponding band portions 12a, 12a adjacent to each other on the side wall 12. This is different from the second embodiment, and the other configurations are substantially the same as those of the second embodiment.

In each of the second reinforcing band portions 30, a part of the side wall 12 between them is bisected in the middle of the first reinforcing band portions 13 and 13 provided in the adjacent angle corresponding band portions 12a and 12a, respectively. It is provided to partition. The shape and the form of reinforcement of each of the second reinforcing band portions 30 are not particularly limited as in the case of the first reinforcing band portion 13. For example, in the case of the yarn fabric described above, the number or thickness of the warp or weft may be reinforced by an additional weave in which the number or thickness of the warp or weft is increased more than that of the weft or the warp, or as another form of reinforcement, the front surface or the back surface of the side wall 12. May be reinforced by suturing, welding or adhering the same or different sheet materials. Further, the tensile strength characteristic of the second reinforcing band portion 30 along the opening direction of the side wall may be set to be relatively smaller than that of the first reinforcing band portion. The width of the side wall 12 of each of the second reinforcing strips 13 in the circumferential direction can be appropriately set according to the form. Further, in the example shown in FIG. 6, a configuration is shown in which the second reinforcing band portion 30 is provided so as to divide a part of the side wall 12 between the adjacent first reinforcing band portions 13 and 13 into two equal parts. The second reinforcing band portion 30 may be provided so as to divide into three equal parts or more.

In the third embodiment, in addition to the configuration of the second embodiment as described above, the second reinforcing band portions 30, 30, ... Are provided on the side wall 12, so that the contents are further further than those of the second embodiment. The elongation of the side wall 12 in the opening direction and the circumferential direction after filling the material is reduced, and the occurrence of body swelling can be suppressed. As a result, the flexible container of the present invention having a small change in the filling shape of the body portion 10 and high filling efficiency can be obtained. In addition, stable stacking is possible, work efficiency is improved, and safety problems are less likely to occur.

Fourth Embodiment FIG. 7 is a perspective view which shows the 4th Embodiment of the flexible container of this invention. In the fourth embodiment, the flexible container of the first embodiment is provided with the same second reinforcing band portions 30, 30, ... As those in the third embodiment. However, instead of the top surface 11 of the third embodiment, a frame body 40 having the same size as the outer circumference thereof is detachably arranged. The configurations other than these are substantially the same as those in the first embodiment.

The frame 40 may have, for example, an annular integrated structure, and can be divided into an appropriate number of divided pieces in the circumferential direction, and the divided pieces are fitted into the frame to form an annular frame. You may. The thickness T and width W of the frame body 40 can be appropriately set, but the outer peripheral length thereof can be expanded or contracted so as to be substantially equal to the outer peripheral length of the side wall 12 or slightly larger than the outer peripheral length. The expandable / contractible structure is not particularly limited, and various conventionally known structures such as those using a band-shaped body of shape memory alloy and those in which a spring or a leaf spring is arranged in a part of the frame body can be applied. By adopting a structure that can be expanded and contracted in the frame body 40 in this way, there is an effect that the upper portion of the body portion 10 can be suppressed from bulging in a circular shape in the cross section.

After filling the flexible container of the fourth embodiment with the contents, the frame 40 is inserted from the filling / discharging port 10b, and the frame body 40 is arranged directly above the contents in a direction orthogonal to the opening direction of the side wall 12. A surface similar to the top surface 11 in the three embodiments can be configured.

With the above configuration, the fourth embodiment can basically obtain the same effect as the first embodiment, is more effective in suppressing body swelling than the first embodiment, and is shown in the second embodiment. Since a surface similar to the top surface can be formed, it can particularly contribute to the stabilization of stacking.

Next, the present invention will be described in more detail with reference to preferred examples of the flexible container of the present invention.

[Example 1]
A polypropylene top and bottom material (both have an area of 0.99 m2, the same shape as that shown in the second embodiment) having a substantially quadrangular planar shape with chamfered corners, and a width of 2 mm made of polypropylene as a raw material. A seamless tubular side wall material having an outer peripheral length of 1.3 m and a length shown in Table 1 was produced from a yarn fabric woven using the flat yarn of No. 1 as a warp and a weft. About four places (corresponding to the corner-corresponding band part) were provided at equal intervals in the circumferential direction, and two additional weave parts were provided for each place. The additional weave portion of each strip had a width of 120 mm, and two warp threads were formed within the width. The suspension belt support portion to which the suspension belt shown in the second embodiment was connected was sewn to each of the additional weave portions. Further, a top surface material and a bottom surface material (both having an area of 0.99 m2) having the same shape as those shown in the second embodiment were sewn on both ends of the side wall material in the opening direction to prepare a body portion. Filling ports and discharging ports are provided in the central regions of the top surface material and the bottom surface material, respectively. Table 1 shows the size and internal volume of the flexible container (corresponding to the second embodiment) of Example 1 thus obtained.

[Comparative Examples 1 and 2]
The plane shape of the top surface material and the bottom surface material was made circular, and the flexible container produced in the same manner as in Example 1 was used as Comparative Example 1 for other configurations. Further, a flexible container produced in the same manner as in Example 1 except that the planar shapes of the top surface material and the bottom surface material were made regular octagons was used as Comparative Example 2. The internal volumes of Comparative Examples 1 and 2 were the same as those of Example 1 (see Table 1).

The same contents were filled in Example 1 and Comparative Examples 1 and 2 by the filling amount shown in Table 1, and the width and height after filling were measured (see Table 1). From this result, the filling amount converted to a height of 1250 mm was calculated. The results are shown in Table 1.

Next, the flexible containers of Example 1 and Comparative Example 2 were stacked flat, and similar flexible containers were stacked on top of them, and the swelling rate before and after that was determined. The reason for stacking before and after is that the conditions are stricter than before and after filling, and a large bulge can be obtained. Here, the body swelling rate is expressed by the ratio of the extension of the outer peripheral length after stacking to the outer peripheral length before stacking.

From the results in Table 1, it was confirmed that the filling amounts of the flexible container of Example 1 converted to a height of 1250 mm and a width of 1160 mm were comparable to or rather larger than those of Comparative Examples 1 and 2, respectively. .. Further, from the results in Table 2, the flexible container of Example 1 has a smaller body swelling rate before and after stacking than that of Comparative Example 2, that is, even when the first reinforcing band portion is provided on the side wall, the bottom surface and the flexible container It was clarified that by making the plane shape of the top surface substantially quadrangular, it is possible to further reduce the body swelling rate as compared with the case of the regular octagonal plane shape.

As described above, the flexible container of the present invention has a substantially quadrangular planar shape on the top surface and the bottom surface, and has a configuration in which a first reinforcing band portion and a second reinforcing band portion are provided on the side wall. It is possible to suppress the occurrence of body swelling due to the elongation of the later side wall material in the opening direction and the circumferential direction, and as a result, the change in the filling shape is small and high filling efficiency can be obtained. In addition, stable stacking is possible, work efficiency is improved, and safety problems are less likely to occur.

The present invention is applicable to both cross-type and running-type flexible containers. Moreover, the flexible container of the present invention does not require a laborious and time-consuming process such as suturing a partition wall in the body, and can be manufactured efficiently and inexpensively.

The flexible container of the present invention can also be provided with an inner bag. The material and shape of the inner bag are not particularly limited as long as the flexible container of the present invention has a shape and size that are in close contact with the side wall and the top surface when the contents are filled. For example, the inner bag may be perforated so as to penetrate inside and outside on the entire surface or a part of the inner bag. Further, the inner bag may be composed of a laminated body in which a plurality of soft resin bags are nested inside.

Although some embodiments of the present invention have been described herein, the present invention is not limited to these embodiments, and parts of each embodiment may be interchanged or different configurations as long as the subject matter of the present invention is not deviated. Can be added.

1 to 4 Flexible container 10 of the present invention Body portion 11 Top surface 11a Outer peripheral portion formed by chamfering 12 Side wall surface 12a Square-corresponding band portion 13 First reinforcing band portion 15 Bottom surface 15a Outer peripheral portion formed by chamfering 17 Suspension belt support portion 18 Suspension belt 30 Second reinforcing band 40 Frame

Claims (9)

A tubular side wall having a filling port on one end side in the opening direction, a bottom surface joined to the other end side of the side wall in a direction orthogonal to the above direction by suturing, bonding or welding, and at least two facing side walls. It has a body part consisting of a hanging belt support part provided in
The plane shape of the bottom surface is quadrangular ,
Each side is virtually divided into three equal parts, four equal parts, six equal parts, or eight equal parts, and the portions corresponding to the respective corners of the quadrangle at both ends of the respective sides are chamfered in an arc shape. Yes,
The side wall is formed with an angle-corresponding band portion that reaches both ends of the side wall in parallel with the opening direction from each of the chamfered outer peripheral portions of the bottom surface .
The first reinforcing band is provided so as to be included in each of the corner-corresponding bands or to protrude in the circumferential direction from the corner-corresponding band .
A flexible container characterized in that the suspension belt support portion is provided on the surface of the first reinforcing band portion. All or part of the corner-corresponding band portion includes the end portion of each of the two articles on the bottom surface side of the first reinforcing band portion, or one or one of the first reinforcing band portions of each of the two articles. The flexible container according to claim 1 , wherein at least a part in the width direction of both bottom end portions is joined so as to protrude from both ends in the circumferential direction of the corner corresponding band portion . When the side wall is made of yarn fabric and the first reinforcing band portion is reinforced by additional weaving, the first reinforcing band portion sets the number of warp yarns arranged within the width of the side wall other than the first reinforcing band portion. According to claim 1 or 2 , the warp yarns having the same width as those of the warp yarns are relatively increased by 30 to 100%, and the increased portion is dispersed within the width and the warp yarns are woven together with the weft yarns. Described flexible container. In the side wall, between the first reinforcing band portions adjacent to each other, the second reinforcing band portion is parallel to the opening direction of the side wall so as to divide the side wall between them into a plurality of equal parts in the circumferential direction. The flexible container according to any one of claims 1 to 3 , which is provided in a strip shape. The flexible container according to claim 4 , wherein the second reinforcing band portion has at least a tensile strength characteristic along the opening direction of the side wall set to be relatively smaller than that of the first reinforcing band portion. On one end side of the side wall in the opening direction, a top surface having the same shape and size as the bottom surface is formed in a direction orthogonal to the direction, and the central region thereof has a size relatively smaller than the opening size of the side wall. The flexible container according to any one of claims 1 to 5 , wherein the filling port is provided. According to any one of claims 1 to 6 , a frame having the same shape and size as the outer circumference of the bottom surface can be detachably arranged on one end side of the side wall in the opening direction in a direction orthogonal to the direction. Described flexible container. The flexible container according to claim 7 , wherein the frame body is configured such that the outer circumference thereof can be expanded or contracted to an outer peripheral length substantially equal to or slightly larger than the outer peripheral length of the side wall. The flexible container according to any one of claims 1 to 8 , which is a running type or a cross type.

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