CONTAINER BAG AND METHOD OF MANUFACTURING THE SAME

Description

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to and the benefit of Korean Patent Application No. 10-2024-0059266, filed on May 3, 2024, the disclosure of which is incorporated herein by reference in its entirety.

BACKGROUND

1. Field of the Invention

The present invention relates to a container bag and a method of manufacturing the same, and more particularly, to a container bag with improved economic feasibility of production and reusability and a method of manufacturing the same.

2. Discussion of Related Art

Generally, a container bag, also called a flexible intermediate bulk container (FIBC), a big bag, or a bulk bag, is an industrial bag for holding, transporting, and storing powders such as grains or synthetic resin materials. The container bag is formed using a flexible material to facilitate the storage of the powders.

At this time, the container bag is filled with about 500 kg to 2,000 kg of contents such as chemicals, minerals, grains, synthetic resin powder materials, and cement. Then, the container bag filled with the powders is transported using lifting equipment such as a crane, a hoist, or a forklift, and stored in a warehouse or loaded onto a truck for transport.

The container bag includes a sidewall portion forming a space in which the contents are stored, a cover portion selectively opening/closing a top of the sidewall portion, and a bottom portion selectively opening/closing a bottom of the sidewall portion. In addition, a ring portion formed as a lifting belt is provided around a circumference of an upper side of the sidewall portion.

Accordingly, the container bag includes an outer bag for maintaining an outer shape and strength and includes an inner liner combined to correspond to an inner circumferential surface of the outer bag and made of waterproof vinyl or the like. In addition, the inner liner and the outer bag are detachably provided, and the powders are stored in the inner liner. At this time, the inner liner is classified as a tube liner, a molding liner, a baffle liner, an aluminum bag in which a secondary battery material is accommodated, or the like according to the type of the inner liner.

Here, in the related art for fixing the inner liner to the container bag, there is a method of attaching a fabric-made adhesive tape to a corner portion or edge portion of the inner liner and sewing and fixing a free portion thereof to an inner edge or corner portion of the outer bag. Alternatively, a loop is sewn and fixed to the inner edge or corner portion of the container bag, and a hole is processed in the free portion of the corner of the inner liner to fix the inner liner by binding a fixing member such as a fabric tape or rope.

Meanwhile, the outer bag and the inner liner are manufactured separately and combined for completion in order to increase the efficiency of the manufacturing process. In addition, the inner liner is manufactured using various materials and in various shapes depending on the type of the powder stored inside, and the inner liner and the outer bag are provided so that they can be combined and separated.

However, in order to combine the inner liner with the inside of the outer bag, a process of flipping the outer bag inside out so that an outer surface and an inner surface of the outer bag switch places, unfolding the outer bag so that the fixing member is smoothly placed at the combining position, and then aligning is required. Then, the fixing member provided as a plurality of fixing members is combined with the edge portion or corner portion of the outer bag, and then the outer bag is flipped right side out so that the positions of the inner and outer surfaces thereof are changed back, and in this way, the container bag is manufactured.

At this time, one end of the fixing member is combined by an adhesive tape or sewing, the other end of the fixing member is combined by methods such as sewing, and the outer bag is manufactured to have a volume in which an inner accommodation space with a large capacity is secured. Accordingly, due to its complexity, the task of combining the outer bag and the inner liner requires manual work by a worker every time they are combined and separated, and thus there are problems in that the time taken for the task increases, and economic feasibility of production significantly decreases.

Further, when the fixing member is combined by methods such as adhesion and sewing, the fixing member may be damaged or released due to impact when the powder is stored and discharged to the outside. In addition, when the fixing member is combined through a hook-and-loop fastener, since it is difficult to secure accuracy in combining and a combining force may be insufficient depending on the weight of the powder, there is a problem that the combination durability of the container bag cannot be secured.

Meanwhile, in the conventional method, it is difficult to separate the outer bag and the inner liner once they are combined by adhesion, sewing, or the like. In addition, the inner liner may be partially contaminated with foreign matter at the time of separation, and there are problems in that environmental pollution may occur and resources may be wasted when a used container bag is entirely incinerated or disposed without being reused.

SUMMARY OF THE INVENTION

The present invention is directed to providing a container bag with improved economic feasibility of production and reusability and a method of manufacturing the same.

The present invention provides a container bag including: an outer bag formed of a woven fabric made of a synthetic resin material and including a sidewall portion formed to have a quadrangular cross-section so that a hollow type accommodating portion is formed therein to store powder, a bottom portion connected to a lower end portion of the sidewall portion to cover a lower portion of the hollow type accommodating portion, a cover portion covering an upper portion of the hollow type accommodating portion and combined along a sewing line sewn to an upper end portion of the sidewall portion, an inlet combined with an opening formed at a central portion of the cover portion to guide an inflow of the powder, and a ring type transport belt sewn and connected to the sidewall portion; an inner liner inserted into the hollow type accommodating portion to seal the powder from the outside and accommodate the powder; and a plurality of connection loops formed in a loop form made of an elastic material and, to fix the inner liner to a relative position in an inner space of the hollow type accommodating portion, each having one end connected to an outer surface portion of the inner liner and the other end bent after passing through a through-gap in an interspace of the woven fabric forming the outer bag and doubly bent additionally by being inserted and withdrawn through a combining gap formed to be spaced from the through-gap so that the plurality of connection loops are fixed by being pressed and stretched together as the withdrawn end portion is stretched.

The present invention also provides a method of manufacturing the container bag, the method including: a first step in which, from a latch portion of a hook needle, which is inserted into the through-gap, that is combined with the connection loop, the connection loop flows to the outside of the outer bag, passes through an outer portion of the through-gap, and is bent; a second step in which the hook needle from which the connection loop is separated is inserted into and withdrawn from the combining gap while passing through an inner portion of a ring of the connection loop; and a third step in which an end portion of the connection loop that is combined with the latch portion is doubly bent by passing through the combining gap and is fixed by being fitted and withdrawn between bodies of the pair of connection loops connecting the through-gap and the combining gap.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing exemplary embodiments thereof in detail with reference to the accompanying drawings, in which:

FIG. 1 is a perspective view of a container bag according to one embodiment of the present invention;

FIG. 2 is a perspective view of an inner liner according to one embodiment of the present invention;

FIG. 3 is a cross-sectional exemplary view illustrating a combined state between an outer bag and the inner liner according to one embodiment of the present invention;

FIGS. 4A and 4B are enlarged exemplary views illustrating a position of a combining portion according to one embodiment of the present invention; and

FIG. 5 is a flowchart illustrating a method of manufacturing a container bag according to one embodiment of the present invention.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

Hereinafter, a container bag and a method of manufacturing the same according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a container bag according to one embodiment of the present invention, and FIG. 2 is a perspective view of an inner liner according to one embodiment of the present invention. Also, FIG. 3 is a cross-sectional exemplary view illustrating a combined state between an outer bag and the inner liner according to one embodiment of the present invention, and FIGS. 4A and 4B are enlarged exemplary views illustrating a position of a combining portion according to one embodiment of the present invention. Meanwhile, FIG. 5 is a flowchart illustrating a method of manufacturing a container bag according to one embodiment of the present invention.

As shown in FIGS. 1 to 3, a container bag 100 according to one embodiment of the present invention may include an outer bag 10, an inner liner 20, and a connection loop 31.

Here, the container bag 100 may be made of a flexible material so that the container bag 10 can be stored with a minimized volume while not storing contents such as powder and can be easily deformed externally to store a large amount of contents in a predetermined space when storing powder.

Specifically, the container bag 100 may be made using a woven fabric such as a natural fiber material and a synthetic resin material such as polyvinyl chloride (PVC), polypropylene (PP), and polyethylene (PE). In this way, the container bag 100 may be formed with a strength that can prevent damage due to an external force while maintaining a state in which an outer shape of the container bag 100 is deformed in accordance with the amount of stored powder.

Next, the outer bag 10 may include a hollow type accommodating portion 90, a sidewall portion 11, a bottom portion 12, a sewing line 14, a cover portion 13, an opening 13a, an inlet 13b, and a transport belt 15. At this time, the outer bag 10 may be made of a fabric made of a synthetic resin material and may be provided with warp and weft woven at a predetermined angle.

Specifically, the sidewall portion 11 formed to be bent may be provided so that the hollow type accommodating portion 90 in which the powder is stored is formed inside the container bag 100. At this time, the sidewall portion 11 may be divided through a plurality of edge portions provided along a circumference so that an accommodation space is formed inside the sidewall portion 11.

In addition, for porosity to be minimized when a plurality of container bags 100 are stacked in front-rear and left-right directions, a cross-sectional shape of the hollow type accommodating portion 90 may be set to a quadrangular shape. To this end, the sidewall portion 11 may be divided into four surface portions, each having a quadrangular cross-section, through four edge portions.

Here, the sidewall portion 11 may have the four surface portions cut separately or provided in a tubular form, neighboring edges of different surface portions may be sewn together and connected, and each of the sewn edges may be formed as the edge portion. In addition, a bending line may be formed so that the edge portions are formed at predetermined intervals in a peripheral direction of the surface portion.

At this time, when the sidewall portion 11 is provided using a single fabric, the sidewall portion 11 may be divided into different sidewalls as bending occurs at a right angle at predetermined intervals that correspond to edge portions 11a, and a cross-sectional shape of the sidewall portion 11 may be formed as a quadrangular shape.

In addition, the portions connected by sewing or heat fusion or bent as described above are formed as the edge portions 11a. At this time, the edge portions 11a may be formed as narrow vertices as shown in the drawings or may be formed to be round with a gentle curve in some cases. That is, boundary portions distinguished by the plurality of sidewalls being bent at a predetermined angle while being continuously connected may be understood as the edge portions 11a.

Meanwhile, at an open upper side of the sidewall portion 11, an end edge portion of the open upper side may be formed to be bent downward and overlap in multiple layers so that an upper end portion overlaps at a predetermined width. Specifically, for the upper end portion of the sidewall portion 11 to overlap at the predetermined width, the edge portion of the open upper side of the sidewall portion 11 may be formed to be bent downward toward an inner side and overlap. Accordingly, since the upper end portion of the sidewall portion 11 is formed thicker than other portions, durability and support strength of a portion with which the transport belt 15, which will be described below, is combined can be improved.

In this way, when lifting the outer bag 10 filled with the powder, it is possible to prevent the peripheral side wall portion 11, with which both end portions of the transport belt 15 are combined, from being torn or damaged. Of course, in some cases, the edge portion of the open upper side of the sidewall portion 11 may be formed to be bent outward, and such a modification belongs to the scope of the present invention.

In addition, in the container bag 100, the bottom portion 12 connected to the lower end portion of the sidewall portion 11 and having an outlet formed to pass through a central portion may be provided. Here, the bottom portion 12 may be connected to the lower end portion of the sidewall portion 11 by sewing or the like to cover a lower side of the hollow type accommodating portion 90.

In addition, the outlet may be formed to pass through the central portion of the bottom portion 12 for the powder to be discharged from the hollow type accommodating portion 90, and a tightener selectively closing the hollow type accommodating portion 90 may be provided along a circumference of the outlet. At this time, the outlet may be formed in a shape that has an edge such as a circular cross-section. Of course, in some cases, the outlet may not be provided.

Meanwhile, the cover portion 13 may be provided to be sewn and connected to the upper end portion of the sidewall portion 11 of the container bag 100 and may have the opening 13a formed to pass through a central portion. Here, the cover portion 13 may be sewn and connected to the upper end portion of the sidewall portion 11 to cover an upper portion of the hollow type accommodating portion 90.

Next, the opening 13a may be formed to pass through the central portion of the cover portion 13 for the powder to be stored in the hollow type accommodating portion 90, and a tightener selectively closing the hollow type accommodating portion 90 may be provided along a circumference of the opening 13a. At this time, the opening 13a may be formed in a shape that has an edge such as a circular cross-section.

In addition, the bottom portion 12 and the cover portion 13 may be provided in a quadrangular shape that corresponds to a cross-sectional shape of the hollow type accommodating portion 90. Also, when the hollow type accommodating portion 90 has a cylindrical shape, the bottom portion 12 and the cover portion 13 may be provided using a circular fabric.

Here, the sidewall portion 11 and the cover portion 13 may be sewn and combined along the sewing line 14. Specifically, the sewing line 14 may be provided by backstitching a sewing thread in a width direction, and the sewing thread may be sewn so that one side of the sewing thread is repeatedly exposed through an outer peripheral surface of the sidewall portion 11. Also, the lower end portion of the sidewall portion 11 and the bottom portion 12 may be sewn and combined along the sewing line 14.

Although the sewing line 14 is described and illustrated as having a single layer in the present invention, the sewing line 14 is not limited thereto and may also be provided in multiple layers such as two layers or three layers along lines of the upper end portion and the lower end portion of the sidewall portion 11.

Meanwhile, the inlet 13b through which the powder is inserted is formed in the central portion of the cover portion 13, and the inlet 13b is connected to the upper end portion of the sidewall portion 11. Specifically, the inlet 13b is formed in the shape of a circular column that is bound to an edge of the opening 13a formed at the center of the cover portion 13. Of course, the shape of the inlet 13b is not limited to the shape of a circular column, and the inlet 13b may be formed in various other shapes. The inlet 13b may be separately formed and bound to the opening 13a of the cover portion 13 or may be integrally formed to extend from an edge of the opening 13a.

Specifically, the inlet 13b serves as a passage that guides introduction of the powder into the hollow type accommodating portion 90. That is, the inlet 13b is brought into close contact with a lower end portion of a funnel through which the powder or the like is discharged, and the powder is inserted into the container bag 100. At this time, when the hollow type accommodating portion 90 is filled with the powder, the inlet 13b may be removed, and the hollow type accommodating portion 90 may be tied with a fixing tie to seal the hollow type accommodating portion 90.

Meanwhile, the hollow type accommodating portion 90 may be understood as an inner space that is selectively sealed by the sidewall portion 11, the cover portion 13, and the bottom portion 12. At this time, the inside may be selectively sealed by tightening the tighteners provided at the opening 13a and the outlet, or the inside may be opened by loosening the tighteners or cutting portions around the outlet at the time of discharge of the powder. Of course, in some cases, the outlet may not be provided at the bottom portion 12, and in such cases, the bottom portion 12 may be cut to discharge the powder. Further, the opening 13a and the outlet may be sealed by heat fusion or sewing of an end edge of each instead of using the above-described tighteners, and such modifications belong to the scope of the present invention.

Next, the transport belt 15 may be provided as a plurality of transport belts 15 at the upper end portion of the sidewall portion 11. Specifically, as shown in the drawings, the transport belt 15 may be provided on each of the edge portions of the container bag 100, and one side of the transport belt 15 may be formed in a ring shape by folding the transport belt 15 one or more times in a longitudinal direction of a central portion of the transport belt 15.

In addition, both end portions of the transport belt 15 may be symmetrically disposed about a central portion of upper end portions of neighboring sidewalls of the sidewall portion 11. Also, both end portions of the transport belt 15 may be sewn to maintain a predetermined gap from the edge portion of the sidewall portion 11. At this time, the gaps between the transport belts 15 may be formed to be equivalent, pairs of transport belts 15 may be formed with gaps at which the pairs are symmetrical to each other, or the transport belts 15 may be connected at intervals that allow equilibrium to be reached in a state in which rings of the transport belts 15 are hung on lifting equipment such as a crane or a hoist. Accordingly, when the transport belts 15 are combined with the sidewall portion 11, the lifting equipment may be inserted into the ring portions of the transport belts 15, and the container bag 100 can be lifted.

Here, the plurality of transport belts 15 are connected at predetermined intervals along the upper end portion of the sidewall portion 11. At this time, the predetermined intervals may be set so that the transport belts 15 are disposed at uniform intervals around the circumference of the upper end portion of the sidewall portion 11. That is, the plurality of transport belts 15 are connected along the upper end portion of the sidewall portion 11, and the transport belts 15 are disposed at predetermined intervals.

Specifically, the transport belts 15 are formed in the form of ties or belts made of a synthetic resin material that each have a predetermined width and extend in the longitudinal direction, and as both end portions of each transport belt 15 are combined with the upper end portion of the sidewall portion 11, the central portion of each transport belt 15 may be formed in a ring shape. In this way, at the time of transporting the outer bag 10 filled with the powder, since the lifting equipment is easily lifted by being inserted into the rings of the transport belts 15, work convenience can be improved.

Here, positions at which both end portions of each transport belt 15 are combined with the upper end portion of the sidewall portion 11 may be set as positions opposite each other about the edge portion 11a. In this way, at the time of lifting using the lifting equipment, a load of the outer bag 10 is prevented from leaning toward one side, and stable lifting and transportation are possible.

Meanwhile, the inner liner 20 is penetrated and open in an up-down direction and has a storage space formed therein. Here, the inner liner 20 may be provided to be inserted into the hollow type accommodating portion 90 to seal the powder from the outside and accommodate the powder. Specifically, the inner liner 20 may be provided in a hollow quadrangular shape, a hollow cylindrical shape, or the like and may have an upper portion and a lower portion that are open, and when the upper and lower portions are each selectively tied in a swan-neck manner and finished, the storage space is sealed and blocked from the outside, and the contents can be safely stored and conveyed. At this time, tying in the swan-neck manner means tying in a state in which an upper end and a lower end are bent and folded inward in the up-down direction and bent with the upper and lower portions of the inner liner 20 densely gathered inward in a radial direction.

In addition, the inner liner 20 may be molded using a multi-layer material including an aluminum layer to correspond to the shape of an inner side of an outer cover. Also, a fusion layer inside the inner liner 20 may be made of a synthetic resin material or the like with high tensile strength such as polyethylene (PE), an optical film, and vinyl and may be made of a transparent material, but is not limited thereto. At this time, the inner liner 20 may be made of a material in which low density polyethylene (LD-PE) and linear low density polyethylene (LLD-PE) are mixed at an appropriate ratio (2:1 to 1:5) according to the purpose. Meanwhile, the inner liner 20 may be provided as an aluminum thin plate to store the powder used as a material of a secondary battery.

Here, the inner liner 20 may be disposed inside the outer bag 10 and may have the upper end and the lower end disposed to be exposed through both sides of the outer bag 10 in the up-down direction. That is, in a state in which the upper portion is open, the upper end of the inner liner 20 may be disposed a predetermined height higher than an upper end of the inlet 13b. Further, in a state in which the lower portion is open, the lower end of the inner liner 20 may be disposed a predetermined height lower than a lower end portion of the outlet.

In this way, at the time of injecting and discharging the powder into and from the storage space formed in the inner liner 20 disposed in the outer bag 10, it is possible to block introduction of foreign matter from the inlet 13b and the outlet into the storage space.

Meanwhile, referring to FIGS. 1 to 4B, the connection loop 31 may be provided so that the inner liner 20 is fixed at a relative position in an inner space of the hollow type accommodating portion 90. That is, the connection loop 31 may be provided to combine with and support the outer bag 10 and the inner liner 20 to maintain a relative distance therebetween. At this time, the connection loop 31 may be provided as a plurality of connection loops 31 and may be formed in the form of a loop made of an elastic material.

Further, the connection loop 31 may be made of materials such as stretchy elastic fibers or rubber rings having elasticity and may be provided in a form in which an outer circumferential surface of a rubber ring is surrounded by fibers or the like. However, the connection loop 31 is not limited thereto and may also be provided in the form of a woven tape or rope in some cases. In this way, the connection loops 31 may be fixed by rubbing against and being caught on each other and may be pressed and stretched to improve a combining force of the connection loops 31.

Here, the outer bag 10 may include a through-gap 18 and a combining gap 19 in order to be combined with and fixed to the inner liner 20. At this time, the through-gap 18 may be formed in an interspace of the woven fabric forming the outer bag 10, and the combining gap 19 may be formed to be spaced from the through-gap 18.

Specifically, the through-gap 18 may be formed at a position of an upper portion of an upper end edge of the sidewall portion 11 and positions of lower portions of a plurality of sites of a lower end edge of the sidewall portion 11. Also, the through-gap 18 may be formed in a sewing interspace of the sidewall portion 11 and the cover portion 13, and the through-gap 18 may be formed between a sewing interspace of the sidewall portion 11 and the bottom portion 12. In this way, it may become easy for the connection loops 31 to pass through the through-gap 18, and work convenience can be increased. Further, the through-gap 18 may be formed at positions of upper portions of a plurality of sites where the sidewall portion 11 and the transport belts 15 come into contact.

Also, the combining gap 19 may be formed between the woven fabric forming the sidewall portion 11 and the sewing line 14. At this time, the combining gap 19 may be formed between the sewing line 14 and the sidewall portion 11 and may be provided to not pass through the sidewall portion 11. That is, the combining gap 19 may be formed by lifting the sewing thread between the sidewall portion 11 and the sewing line 14. Specifically, the combining gap 19 may be formed between an outer surface of the sidewall portion 11 and the sewing line 14, and the connection loop 31 may be provided to be inserted and withdrawn through the combining gap 19.

Here, the through-gap 18 formed at the upper end portion of the sidewall portion 11 may be formed at the sewing line 14 sewn on an outer side of one end of the transport belt 15 when the transport belt 15 is folded. Specifically, the combining gap 19 may be formed in a space between the transport belt 15 and the sewing line 14, and such a modification belongs to the scope of the present invention.

Meanwhile, referring to FIG. 4B, the through-gap 18 and the combining gap 19 may be formed in a woven interspace of the woven fabric forming the sidewall portion 11. At this time, the combining gap 19 that corresponds to each through-gap 18 may include a first combining gap 19a and a second combining gap 19b. Specifically, the first combining gap 19a may be formed to be spaced from the through-gap 18 in the woven fabric, and the second combining gap 19b may be formed between lines connecting the through-gap 18 and the first combining gap 19a in the woven fabric. Accordingly, the connection loops 31 may be combined through the through-gaps 18, the first combining gap 19a, and the second combining gap 19b, and each connection loop 31 may be combined by passing through the outer bag 10 three times.

In addition, the through-gaps 18 and the combining gaps 19 may be provided at positions of a plurality of sites on the sidewall portion 11, and it may be understood that the number of through-gaps 18 and the number of combining gaps 19 may change according to the purpose of the container bag 100 and the type of contents such as the powder. Accordingly, manufacturing costs of the connection loops 31 can be reduced without damage to the container bag 100 or separation between the outer bag 10 and the inner liner 20 according to the materials and strengths of the outer bag 10 and the inner liner 20 and the stored amount and density of the powder, and economic feasibility and work efficiency can be improved.

Meanwhile, referring to FIGS. 3 to 4B, one end of the connection loop 31 may be connected to an outer surface portion of the inner liner 20, and the other end of the connection loop 31 may be combined with the through-gap 18 and the combining gap 19 of the outer bag 10 and fixed so that a combining portion 30 is formed. Specifically, each connection loop 31 may have one end connected to an outer surface portion of the inner liner 20 and the other end inserted and withdrawn through the combining gap 19 after passing through the through-gap 18, and the connection loops 31 may be provided to be fixed by being pressed and stretched together as the withdrawn end portion of each connection loop 31 is stretched.

At this time, the connection loop 31 passing through the through-gap 18 may be provided to be bent and may be bent in a direction in which the combining gap 19 is located. Also, the connection loop 31 inserted and withdrawn through the combining gap 19 may be provided to be doubly bent additionally and may be bent at the time it is inserted into the combining gap 19 and after it is withdrawn from the combining gap 19. Accordingly, the connection loop 31 is provided to be bent three times by passing through the through-gap 18 and the combining gap 19. Thus, an end portion of the connection loop 31 may be located outward at inner sides of portions of the connection loops 31 formed as a pair connecting the through-gap 18 and the combining gap 19.

In addition, an end portion of the connection loop 31 withdrawn through the combining gap 19 may be fitted and withdrawn between bodies of the pair of connection loops 31 connecting the through-gap 18 and the combining gap 19.

Here, being fitted and withdrawn means that one end of the connection loop 31 passes through portions of the connection loops 31 formed as a pair connecting the through-gap 18 and the combining gap 19, and since a space between both sides of the connection loop 31 is formed to be narrow, the connection loop 31 passes through the portions while the portions are pressed together.

At this time, a case of withdrawal to any one of left and right outer spaces at both sides of the connection loop 31 is not included. In this way, the connection loop 31 that is fitted and withdrawn is stretched and fixed, and the connection loop 31 is pressed and fixed by a rubbing force and stretchability thereof. Therefore, since stable combination of the outer bag 10 and the inner liner 20 is secured through the connection loop 31, and an additional task for combination is omitted, work efficiency and convenience can be significantly improved. Also, since the connection loop 31 is triply bent and combined, a rubbing area of the connection loop 31 increases multiplicatively. In this way, a rubbing support force of the connection loop 31 is further improved and maintained without separation between the outer bag 10 and the inner liner 20 or damage to the container bag 100 even while the powder having a weight ranging from 50 to 100 kg is being filled, and durability can be significantly improved.

Further, when the first combining gap 19a and the second combining gap 19b are formed in the woven fabric of the outer bag 10, the connection loop 31 may be inserted into the first combining gap 19a and withdrawn through the second combining gap. Specifically, the connection loop 31 is bent by passing through the through-gap 18 to the outside of the outer bag 10 and is additionally bent by being inserted into the first combining gap 19a. Then, the connection loop 31 is bent additionally by being withdrawn through the second combining gap 19b, and in this way, the connection loop 31 is provided to be bent in a total of three layers.

At this time, the end portion of the connection loop 31 withdrawn through the second combining gap 19b may be fitted and withdrawn between bodies of the pair of connection loops connecting the through-gap 18 and the first combining gap 19a. In this way, since the interspace of the woven fabric of the outer bag 10 is narrow, a fixing pressure of the first combining gap 19a and the second combining gap 19b is increased, and a combining force and durability can be improved.

Also, the combining portion 30 is formed to maintain combination by a fixing force through rubbing support between different connection loops 31 and narrowness of the combining gap 19. In this way, the combining portion 30 may, when necessary, separate the connection loop 31 passing through the combining gap 19 from the combining gap 19 and release the combination between the outer bag 10 and the inner liner 20. In this way, since the combination between the outer bag 10 and the inner liner 20 is released without foreign matter generation and contamination, the container bag 100 can be reused such that resources are saved and usability is improved. In addition, when the outer bag 10 and the inner liner 20 are combined using methods such as fusion, sewing, and adhesion, a problem in which foreign matter may be introduced into the powder can be prevented, and storage stability can be significantly improved.

Further, the combining portion 30 may be formed on an outer peripheral surface of the outer bag 10. Also, the combining portion 30 may be formed by the connection loops 31 being exposed from inside the outer bag 10 without turning the outer peripheral surface and inner peripheral surface of the outer bag 10 inside out. At this time, whether combination of the combining portion 30 is maintained and whether the connection loops 31 are damaged can be immediately observed from outside the outer bag 10 and can be observed even while the powder is filled, thereby significantly improving work efficiency and use convenience of the container bag 100.

In addition, the through-gap 18 may be formed at positions of upper portions of a plurality of sites that come into contact with the transport belt 15. That is, the through-gap 18 may be formed at a position of the sidewall portion 11 that comes into contact with the transport belt 15 and an interspace of the cover portion 13, and the combining gap 19 may be formed in the sewing line 14 that comes into contact with an outer peripheral surface of one end of the transport belt 15. Meanwhile, both end portions of the transport belt 15 may be provided to extend to a lower portion of the sidewall portion 11 in the longitudinal direction of the sidewall portion 11. In this way, the through-gap 18 and the combining gap 19 may be formed at positions of a plurality of sites coming into contact with the transport belt 15 even at the lower portion of the sidewall portion 11, and lifting stability and durability of the container bag 100 can be improved.

At this time, a relative position at which the connection loop 31 is combined with the outer bag 10 may be provided at one side of the sidewall portion 11 to which both end portions of the transport belt 15 are sewn and combined instead of being provided at a vertex of an upper end edge portion of the container bag 100. In this way, the connection loop 31 is formed at an upper end of the edge portion 11a of the sidewall portion 11, and it is possible to prevent a problem in which, at the time of filling, the inner liner 20 leans downward due to the weight of the powder and storage efficiency decreases. Therefore, by the through-gap 18 and the combining gap 19 being formed at positions coming into contact with the transport belt 15, the upper end portion of the edge portion 11a does not lean downward, and the powder is filled in the upper end portion of the edge portion 11a, and thus the storage efficiency can be improved. Also, since combination of the combining portion 30 is fixed and supported through strengths of the woven warp and weft of the outer bag 10 and strengths of the transport belts 15 at portions where the transport belts 15 are sewn and combined, combination stability can be increased.

Meanwhile, a fixing tape 32 may be provided so that one end of the connection loop 31 is connected to the inner liner 20. Specifically, the fixing tape 32 may be provided in the form of a ring in order to be combined in a ring shape with the connection loop 31 provided in a loop shape, and both end portions of the fixing tape 32 may be combined with the inner liner 20, but the present invention is not limited thereto. At this time, the connection loop 31 and the fixing tape 32 may be combined using other methods such as sewing, and such a modification belongs to the scope of the present invention.

In addition, the fixing tape 32 may be provided as a plurality of fixing tapes 32 in order to be combined with the inner liner 20 while corresponding to the connection loop 31 provided as a plurality of connection loops 31. Also, the fixing tape 32 may be provided in the form of a woven fabric tape, and in this way, the durability of the fixing tape 32 can be increased, and the connection between the inner liner 20 and the connection loops 31 can be stably maintained. Meanwhile, the fixing tape 32 may be provided in the form of an oriented polypropylene (OPP) tape or may be provided by a plurality of filaments being reinforced in the longitudinal direction, and such modifications belong to the scope of the present invention.

Here, the fixing tape 32 may be provided between the connection loop 31 and the inner liner 20. Thus, at the time of combining the outer bag 10 and the inner liner 20, a problem in which the pressure applied to the connection loop 31 is directly transmitted to the inner liner 20 can be prevented. That is, through the strength of the woven fabric of the fixing tape 32, pressure applied to the inner liner 20 due to filling the powder and lifting the container bag 100 can be reduced, and in this way, durability and combining force can be improved.

Meanwhile, referring to FIGS. 1 to 5, a method of manufacturing the container bag 100 according to an exemplary embodiment of the present invention includes a series of steps such as step s1 in which the connection loop is bent by passing through the through-gap to the outside of the outer bag, step s2 in which the hook needle is inserted and withdrawn through the combining gap of the outer bag, and step s3 in which the connection loop that is combined with a latch portion of the hook needle passes through the combining gap and is fixed by being fitted and withdrawn.

Specifically, the connection loop 31 may be exposed to the outside from inside the outer bag 10 through the through-gap 18. At this time, a hook needle 33 may be provided for the connection loop 31 to penetrate to the outside of the outer bag 10. Here, the hook needle 33 may include a latch portion 33a having one end on which the ring of the connection loop 31 is caught and combined. Accordingly, in the hook needle 33, one end of the connection loop 31 may be combined with the latch portion 33a of the hook needle 33 after being inserted from outside the outer bag 10 into the through-gap 18. At this time, the one end of the connection loop 31 that is combined with the latch portion 33a is withdrawn in the opposite direction of a path along which the hook needle 33 is inserted into the through-gap 18, and in this way, the connection loop 31 may be exposed to the outside of the outer bag 10 and bent toward the combining gap 19.

In addition, the hook needle 33 may be located to pass through an inner portion of the ring of the connection loop 31 that penetrates to the outside of the outer bag 10. Specifically, the hook needle 33 in a state in which an end portion of the connection loop 31 is separated from the latch portion 33a may be provided to pass through the inner portion of the ring of the connection loop 31. In addition, the hook needle 33 passing through the inner portion of the ring of the connection loop 31 may be inserted and withdrawn through the combining gap 19, and the connection loop 31 may be located outside the combining gap 19.

Also, an end portion of the connection loop 31 may be combined with the latch portion 33a of the hook needle 33 that has passed through the combining gap 19, and the end portion of the connection loop 31 may be inserted and withdrawn through the combining gap 19. At this time, the end portion of the connection loop 31 may pass through the combining gap 19 and may be inserted and withdrawn in a direction opposite to a direction in which the hook needle 33 has passed through the combining gap 19.

Therefore, the connection loop 31 inserted and withdrawn through the combining gap 19 may be provided to be primarily bent when being inserted into the combining gap 19 and secondarily bent when being withdrawn. In addition, the end portion of the connection loop 31 that is withdrawn through the combining gap 19 and bent may be fitted and withdrawn between bodies of the pair of connection loops 31 connecting the through-gap 18 and the combining gap 19. At this time, the end portion of the connection loop 31 that is fitted and withdrawn may be stretched, and throughout an area in which the connection loops 31 come into contact, the connection loops 31 may be pressed and stretched together and fixed by a rubbing support force.

Meanwhile, the combining portion 30 on which the connection loop 31 is formed to be fixed may be provided on an outer surface of the outer bag 10, and when the combining portion 30 is released, may stretch in a direction opposite to a direction in which the connection loop 31 is bent. Specifically, the combining portion 30 may be released so that the end portion of the connection loop 31 that is fitted and withdrawn by stretching any one of the bodies of the pair of connection loops 31 connecting the through-gap 18 and the combining gap 19 is separated from the combining gap 19. Thus, work convenience of combining and separating the outer bag 10 and the inner liner 20 can be improved, and resources can be saved due to ease of reusing the outer bag 10 and the inner liner 20.

The present invention provides the following advantageous effects.

First, since an outer bag and an inner liner are combined by one end of a connection loop being connected to an outer surface portion of the inner liner and the other end of the connection loop being inserted into and withdrawn from the outer bag and being triply bent, a container bag can be manufactured by combining the outer bag and the inner liner in a state in which the inner liner is inserted into the outer bag, and thus economic feasibility of production can be significantly improved.

Second, since the connection loop made of an elastic material and bent after passing through a through-gap is continuously doubly bent additionally by passing through a combining gap, and an end portion of the connection loop is fitted and withdrawn between both side bodies of the connection loop, as the end portion of the connection loop stretches, different connection loops can be fixed by being pressed and stretched together, and the combination durability of the container bag can be improved.

Third, since the connection loop is separated from the outer bag through a hook needle in reverse order from when it is inserted into and withdrawn from the outer bag, a separation process between the outer bag and the inner liner can be simplified, and since the outer bag and the inner liner are separated without damage to the container bag or contamination due to mixing of foreign matter, reusability can be significantly improved.

The present invention is not limited to the embodiments described above, modifications can be applied by those of ordinary skill in the art to which the invention pertains without departing from the technical spirit of the present invention claimed in the claims, and such modifications belong to the scope of the present invention.