Method for manufacturing a container bag with integrated reinforcing bars, and a container bag manufactured thereby.

Abstract

To provide a method for manufacturing a container bag having an integrated reinforcing bar, and the container bag manufactured by the method.SOLUTION: There are provided: a manufacturing method of a container bag having an integrated reinforcing bar, and more particularly, the manufacturing method of the container bag which allows the tensile strength of an octagonal integrated reinforcing bar to be improved, swelling to be minimized, and the adhesion between the reinforcing bar and a sidewall (of the container bag) to be improved, while the waterproofness of the container bag is secured; and a container bag manufactured by the method.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a container bag having an integral reinforcing rib and a container bag manufactured thereby. In particular, while ensuring the waterproofness of the container bag, the tensile strength of the octagonal integral reinforcing rib is improved, the swelling is minimized, and the adhesion between the reinforcing rib and the (container bag's) side wall is improved. The present invention relates to a method for manufacturing a container bag having an integral reinforcing rib, and a container bag manufactured thereby.

[0002] The present invention also uses a high-strength film to manufacture the reinforcing rib itself. The high-strength film is manufactured within a density range of 0.9 to 0.95 g / cm 3 , a melt index of 0.3 to 1.0 g / 10 min, and a melting point of 115 to 129 °C. The present invention relates to a method for manufacturing a container bag having an integral reinforcing rib that can ensure rigidity against the load of the contents while having smooth sealing bonding, and a container bag manufactured thereby.

Background Art

[0003] Generally, a container bag is manufactured from a paper material, a fabric, or a flexible synthetic resin material to be advantageous for weight reduction, and can accommodate and store / transport powdery or particulate contents such as grains, feeds, cement, and synthetic resin raw materials (resins).

[0004] Since such a container bag is easily deformed in shape, it can be stored with its volume minimized (folded) when it does not contain the contents.

[0005] Furthermore, when transporting goods by air or sea, it is desirable to be able to load a large amount of cargo into a designated space (container) in order to reduce logistics costs. However, conventional flexible container bags, as mentioned above, bulge outwards due to the weight of their contents when filled, making them unsuitable for efficient use of space.

[0006] Therefore, an improvement is needed to reduce the loading volume of the container bag by ensuring it maintains a rectangular shape when filled with contents.

[0007] One technique for reducing such bulging is disclosed in Patent Document 1 and illustrated in Figures 1 and 2. In this technique, an internal lateral reinforcement section 300, which is a wide belt structure, is directly connected to the main body section 100 by stitching. This counteracts the outward force applied by the load of the contents and generates an inward force, thereby preventing bulging, maintaining a good hexahedral shape, and also being effective in keeping the container bag upright.

[0008] However, in the aforementioned container bags, the internal lateral reinforcement section 300 is directly attached to the main body section 100 by sewing, which generates foreign matter such as leftover sewing threads, making the sewing process cumbersome. Furthermore, it is unsuitable for storing powdered materials that require waterproofing, such as rice, flour, and chemical materials. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Korean Registered Patent Publication No. 10-1874264 [Overview of the project] [Problems that the invention aims to solve]

[0010] The present invention was created to solve the aforementioned problems, and its purpose is to provide a method for manufacturing a container bag having integrated reinforcing bars, in which the inside of the side wall of the container bag is coated with a first film and reinforcing bars are attached by sealing joints, thereby preventing a decrease in waterproofing function and enabling the safe transport of moisture-vulnerable contents such as rice, flour, and chemical materials, unlike conventional methods where the bars are fixed by sewing. The invention also provides a container bag manufactured by this method.

[0011] Another object of the present invention is to provide a method for manufacturing a container bag having multiple reinforcing bars and adhesive members that improve the tensile strength of the reinforcing bars and adhesive members, minimize bulging, and improve the adhesion between the reinforcing bars and adhesive members and the container bag body, while ensuring the waterproofness of the container bag, and to provide a container bag manufactured by the same method. [Means for solving the problem]

[0012] To achieve the above objective, the present invention provides a method for manufacturing a container bag comprising: a rectangular cylindrical side wall member having four corner sections, a rectangular cross-section, partitioned from the outside by four side walls, and containing contents; and reinforcing bars joined to the inner surface of each side wall to support the load of the contents, a) A step of forming a first film by coating one surface of the side wall member with a material of the same material as the side wall member, such that the first film is located on the inside, thereby forming the side wall member into a rectangular tube shape, b) The step of preparing the octagonal cylindrical reinforcing bars so as to form connecting portions that connect the planar portions, which are positioned opposite each other in the central portion of each side wall, and the adjacent side wall of the corner portion, c) The step of forming multiple through holes at regular intervals in the connecting portion, d) The process is characterized by including the step of sealing and joining each of the planar portions to each of the side walls.

[0013] Furthermore, the manufacturing method of the present invention is characterized in that both the side wall member and the reinforcing bar are made of a high-strength film, and the invention further includes an outer bag in which the side wall member is housed and which is woven from yarn of a flexible material.

[0014] Furthermore, the present invention, which achieves the above objective, provides a method for manufacturing the body of a container bag comprising: a rectangular cylindrical side wall member having four corner sections, a rectangular cross-section, partitioned from the outside by four side walls, and containing contents; and reinforcing bars joined to the inner surface of each side wall to support the load of the contents, a) A step of transporting the side wall member, which is woven from a flexible material yarn, while forming it into a tube shape, b) A step of transporting the tube-shaped side wall members to be transported so that their inner surfaces are in contact with each other, c) A step of applying molten thermoplastic resin material to the upper and lower surfaces of the side wall member and cooling it to form a first film, d) The step of turning the tubular sidewall member inside out so that the first film is located on the inside, e) The step of preparing the octagonal cylindrical reinforcing bars so as to form connecting portions that connect the planar portions, which are positioned opposite each other in the central portion of each side wall, and the adjacent side wall of the corner portion, f) The step of forming multiple through holes at regular intervals in the connecting portion, g) The step of sealing and joining the planar portion to each of the side walls is included.

[0015] Furthermore, in the manufacturing method of the present invention, the reinforcing bar is characterized in that a thermoplastic resin material is applied to the woven reinforcing bar fabric and to one surface of the reinforcing bar fabric facing the side wall, and then cooled to form a second film.

[0016] Furthermore, in the manufacturing method of the present invention, a thermoplastic resin material is applied to the other side of the reinforcing bar fabric and cooled to form a third film.

[0017] In addition, in the manufacturing method of the present invention, the reinforcing bars are made of PE (polyethylene), with a density range of 0.9 to 0.95 g / cm 3 , a melt index of 0.3 to 1.0 g / 10 min, and a melting point of 115 to 129 °C.

[0018] In addition, in the manufacturing method of the present invention, the sealing portion of the side wall that comes into contact with the reinforcing bars is made such that PP (polypropylene) and PE (polyethylene) are alternately woven.

Effects of the Invention

[0019] First, by coating the inner surface of the side wall of the container bag with the first film and attaching the reinforcing bars by sealing bonding, unlike the conventional method of fixing by sewing, it is possible to prevent a decrease in the waterproof function and safely transport contents that are vulnerable to moisture, such as rice, flour, and chemical materials.

[0020] Second, by forming the reinforcing bars and the side wall by weaving, it is possible to improve the tensile strength that mutually pulls adjacent side walls and minimize the swelling of the container bag.

[0021] In particular, when the side wall member of the container bag and the reinforcing bars are made by lattice weaving, and a film of a thermoplastic resin material is coated on one surface of each element and adhered by heat pressing, the melted film penetrates into the gaps between the woven raw yarns and is cured, so that the reinforcing bars are integrated with the side wall of the container bag and adhered, enabling stable adhesion of the reinforcing bars due to the content load.

[0022] Third, a part of the side wall that comes into contact with the reinforcing bars is made such that PP (polypropylene) and PE (polyethylene) are alternately woven. When pressure is applied while heating with the reinforcing bars abutted against each side wall, the PE portion of the side wall melts and is mixed with the first film and the second film, ensuring not only waterproofness but also more stable adhesion of the reinforcing bars.

[0023] Fourthly, the present invention also provides a high-strength film for the reinforcing bar itself, thereby enabling the high-strength film to have a density range of 0.9 to 0.95 g / cm³. 3 The material is manufactured with a melting index of 0.3 to 1.0 g / 10 min and a melting temperature range of 115 to 129°C, ensuring smooth sealing while maintaining rigidity against the load of the contents. [Brief explanation of the drawing]

[0024] [Figure 1] This is a perspective view showing a conventional container bag. [Figure 2] Figure 1 is a perspective view of the main part. [Figure 3] This is a perspective view showing the side wall member of a container bag according to an embodiment of the present invention. [Figure 4] This is a cross-sectional view of Figure 3. [Figure 5] This is a cross-sectional view showing a side wall member of another embodiment. [Figure 6] Figure 5 is an enlarged view of the main part. [Figure 7] Figure 6 is a perspective view showing the main components separated. [Figure 8] Figure 7 is a cross-sectional view of the joint. [Figure 9] This is a cross-sectional view of a key part showing a side wall member of yet another embodiment of the present invention. [Figure 10] This diagram illustrates a method for forming a first film on a side wall member. [Figure 11] This diagram shows the pattern of the sealing joint. [Figure 12] Furthermore, here are cross-sectional views of the side wall member and outer bag of another embodiment. [Modes for carrying out the invention]

[0025] [First Embodiment] Referring to Figures 3 and 4, the container bag of the first embodiment of the present invention comprises a rectangular cylindrical side wall member 10 having four corner portions 11a, a rectangular cross-section, partitioned from the outside by four side walls 11, and containing contents, and reinforcing bars 20 joined to the inner surface of each side wall 11 to support the load of the contents.

[0026] The method for manufacturing the container bag involves first coating one surface of the side wall member 10 with a material of the same material as the side wall member 10 to form a first film 41, and shaping the side wall member 10 into a rectangular tube by positioning the first film 41 on the inside.

[0027] The side wall member 10 can also be manufactured by applying a thermoplastic resin material to a flat surface, cooling it to form the first film 41, and then shaping the side wall member 10 into a rectangular tube.

[0028] If the side wall member 10 is manufactured by weaving synthetic resin yarn, a film coating for waterproofing or strength improvement can also be applied to the outer surface of the side wall member 10.

[0029] The reinforcing bar 20 is formed in an octagonal cylindrical shape so as to form a connecting portion 22 that connects the flat portions 21, which are positioned opposite each other in the central part of each side wall 11, and the adjacent side wall 11 of the corner portion 11a.

[0030] Multiple through holes 22a are formed in the connecting portion 22 at regular intervals. Each of the aforementioned flat portions 21 is sealed and joined S to each of the aforementioned side walls 11. As described above, the container bag manufactured improves the tensile strength of the octagonal, integrated reinforcing bar 20 while ensuring the waterproofness of the container bag, minimizing bulging, and improving the adhesion between the reinforcing bar 20 and the side wall 11 of the container bag.

[0031] [Second Embodiment] The method for manufacturing the container bag of the second embodiment involves making both the side wall member 10 and the reinforcing bar 20 from high-strength film.

[0032] As shown in Figure 12, an outer bag 100 woven from a flexible material is placed on the outside of the side wall member 10, forming a double bag.

[0033] As described above, the manufactured container bag ensures the waterproofness of the container bag while improving the tensile strength of the octagonal integrated reinforcing bar 20, minimizing bulging, and the woven outer bag 100 protects the side wall member 10 from damage such as scratching and perforation caused by external forces.

[0034] If the outer bag 100 is manufactured by weaving synthetic resin yarn, a film coating for waterproofing or strength enhancement may be applied to the outer surface of the outer bag 100.

[0035] [Third Embodiment] The third embodiment is another embodiment of the first embodiment and will be described with direct reference to Figures 3 and 4.

[0036] Referring to Figures 3 and 4, which show the side wall member 10 of the container bag according to the first embodiment of the present invention, the side wall member 10 comprises a side wall 11 that forms an internal space in which contents are stored and is separated from the outside by a side wall 11 having a rectangular cross-section with four corner portions 11a, a cover portion (not shown) having an opening in the center into which contents are put and connected to the upper end of the side wall member 10, and a bottom portion (not shown) connected to the lower end of the side wall member 10.

[0037] A ring (not shown) for traction is formed at the upper end of the side wall member 10, and an inlet and an outlet for the contents to enter and exit are formed in the cover portion and the bottom portion.

[0038] The side wall members 10 of the container bag are made of a flexible material that allows for easy modification of the external shape, so that various contents such as grains, synthetic resin materials, minerals, powders such as cement, and chemical substances can be stored in a small volume when empty, and so that the maximum amount can be stored when filled.

[0039] For example, the side wall member 10 is made using PVC (polyvinyl chloride), synthetic resin material (PP (polypropylene), PE (polyethylene)), and is formed to maintain its external shape and strength even when filled with contents.

[0040] The side wall member 10 is equipped with reinforcing bars 20 inside to prevent bulging after the contents are placed inside.

[0041] The reinforcing bars 20, like the side wall members 10, are made of PVC or synthetic resin material (such as PP), and are maintained in an octagonal shape after contents are placed inside the side wall members 10.

[0042] The reinforcing bar 20 is composed of a flat portion 21 positioned opposite the central portion of each side wall 11 and recessed between it and the side wall 11, to which it is sealed and joined S, and connecting portions 22 connected at both ends of each flat portion 21 to connect the two adjacent side walls 11 of the corner portion 11a. The connecting portion 22 has multiple through holes 22a formed therein so that the contents being placed can move smoothly toward the corner portion 11a, and it is not bonded to the side wall 11 by a sealing joint S.

[0043] As an example, the side wall member 10 of the container bag with the configuration described above can be manufactured as follows.

[0044] Referring to Figures 3, 4, and 10, the method for manufacturing the container bag involves transporting side wall members 10 woven from flexible PP (polypropylene) or PE (polyethylene) yarns while forming them into a tube shape, and transporting the transported tube-shaped side wall members 10 flat so that their inner surfaces are in contact with each other.

[0045] Next, molten thermoplastic resin material is applied to the upper and lower surfaces of the side wall member 10 and cooled to form the first film 41.

[0046] Next, the tube-shaped sidewall member 10 is turned inside out so that the first film 41 is positioned on the inside.

[0047] The thermoplastic resin material forming the first film 41 permeates between the woven filaments during application, not only ensuring waterproofness but also preventing filamentous threads from flowing into the interior where the contents are placed, thereby making the side wall member 10 rigid.

[0048] Next, the flat portion 21 of each reinforcing bar 20 is brought into contact with each side wall 11 and sealed.

[0049] At this time, the molten films (first film 41, second film 42, third film 43) seep into the gaps between the woven filaments of the side wall 11 and the reinforcing bars 20 and harden, as shown in Figure 8.

[0050] In this case, not only is waterproofing ensured by the first film 41, but the reinforcing bars 20 and the side walls 11 are integrated, enabling stable adhesion without the reinforcing bars 20 peeling off due to the load of the contents.

[0051] Furthermore, the sealing joint S portion can be implemented in various patterns, as illustrated in Figure 11.

[0052] Referring to Figures 5 to 8, which illustrate another embodiment of the present invention, a rectangular tubular side wall member 10 is prepared by weaving PP yarn or PE yarn, and a thermoplastic resin material is applied to the inner surface of the side wall member 10 to form a first film 41.

[0053] The reinforcing bars 20 are manufactured by applying a thermoplastic resin material to both sides of a reinforcing bar fabric 23 woven from PP or PE to form a second film 42 and a third film 43.

[0054] Next, each flat portion 21 of each reinforcing bar 20 is brought into contact with each side wall 11 and pressurized while heat is applied. At this time, the molten film (first film 41, second film 42, third film 43) seeps into the gaps between the woven filaments of the side walls 11 and the reinforcing bars 20, as shown in Figure 8, and is cooled and hardened.

[0055] In this case, the reinforcing bars 20 and the side walls 11 of the container bag are integrated, enabling stable adhesion without the reinforcing bars 20 peeling off due to the load of the contents.

[0056] Furthermore, referring to Figure 7, the sealing portion S of the side wall 11 that comes into contact with the reinforcing bar 20 and is sealed is manufactured so that PP and PE are woven alternately.

[0057] In this case, when the flat portion 21 is brought into contact with each of the side walls 11 and pressure is applied while heat is being applied, the PE portion of the side wall 11 is melted, and the first film 41 and the second film 42 are mixed together, ensuring not only waterproofness but also more stable adhesion of the reinforcing bars 20.

[0058] In particular, the reinforcing bars 20 are made by weaving highly rigid PP, which not only ensures tensile strength, but the sealing portion S of the side wall 11 is formed by alternating layers of PP and PE, so that when heat and pressure are applied, the melting of the PE portion ensures stable adhesion of the reinforcing bars 20.

[0059] Figure 9 shows yet another embodiment of the present invention, in which the reinforcing bar 20 itself is made of a high-strength film, the high-strength film being made of PE with a density range of 0.9~0.95 g / cm³. 3 The material is manufactured with a melting index of 0.3 to 1.0 g / 10 min and a melting point in the range of 115 to 129°C. In this case, the sealing joint is smooth while ensuring sufficient resistance to the load of the contents.

[0060] As described above, when the contents of the container bag are placed in the side wall member 10, the weight of the contents will cause a load to be applied to the side wall member 10 in the downward direction and to the side wall 11 direction.

[0061] In other words, the load of the contents is applied in the direction of each side wall 11 and the corner portion 11a, causing each side wall 11 to bulge outwards, and at each corner portion 11a, the load of the contents acts to widen the angle between adjacent side walls 11.

[0062] At this time, the load of the contents will also act on each reinforcing bar 20, allowing the side wall member 10 to maintain its rectangular shape.

[0063] The loads acting on each of the side walls 11 and the loads acting on each corner portion 11a will be supported by the reinforcing bars 20. In this case, mutual tensile forces will act between the flat portion 21 and the connecting portion 22 of the reinforcing bars 20, preventing the side wall member 10 from bulging.

[0064] The container bag of the present invention is constructed by coating the side wall member 10 with a first film 41 and joining the reinforcing bars 20 to the side wall member 10 by sealing joints. Unlike conventional methods where the bags are fixed by sewing, this prevents a decrease in waterproofing function and allows for the safe transport of contents that are vulnerable to moisture, such as rice, flour, and chemical materials.

[0065] The present invention, as described above, is not limited to the embodiments described above, and it goes without saying that modifications can be made by a person with ordinary skill in the art to which the present invention belongs without exceeding the scope claimed in the claims of the present invention, and such modifications fall within the scope of the present invention. [Industrial applicability]

[0066] The present invention provides a method for manufacturing a container bag having integrated reinforcing bars, and the container bag manufactured thereby can be effectively applied, for example, to technical fields related to the storage and transportation of goods. [Explanation of Symbols]

[0067] 10 Side wall member 11 Side wall 20 Reinforcement muscles 21 Plane part 22 Connecting part 23 Reinforcement fabric

Claims

1. A method for manufacturing a container bag comprising a rectangular cylindrical side wall member (10) having four corner sections, a rectangular cross-section, partitioned from the outside by four side walls (11), and containing contents, and reinforcing bars (20) joined to the inner surface of each side wall (11) to support the load of the contents, a) A step of transporting the side wall member (10), which is woven from a flexible material yarn, while forming it into a tube shape, b) A step of transporting the tube-shaped side wall members (10) to be transported so that their inner surfaces are in contact with each other, c) The step of applying molten thermoplastic resin material to the upper and lower surfaces of the flattened side wall member (10) and cooling it to form the first film (41), d) The step of turning the tube-shaped side wall member (10) inside out so that the first film (41) is located on the inside, e) The step of preparing the octagonal cylindrical reinforcing bar (20) so as to form a connecting portion (22) that connects the flat portions (21) which are positioned opposite to the central portion of each side wall (11) and the adjacent side wall (11) of the corner portion (11a), f) The step of forming a plurality of through holes (22a) at regular intervals in the connecting portion (22), g) A method for manufacturing a container bag having integrated reinforcing bars, comprising the step of sealing and joining each of the planar portions (21) to each of the side walls (11).

2. The method for manufacturing a container bag having an integrated reinforcing bar according to claim 1, characterized in that the reinforcing bar (20) is formed by a woven reinforcing bar fabric (23) and a second film (42) formed by applying a thermoplastic resin material to one surface of the reinforcing bar fabric (23) facing the side wall (11) and cooling it.

3. The method for manufacturing a container bag having an integrated reinforcing bar according to claim 2, characterized in that a thermoplastic resin material is applied to the other side of the reinforcing bar fabric (23) and cooled to form a third film (43).

4. The method for manufacturing a container bag having an integrated reinforcing bar according to claim 3, characterized in that the sealing portion S of the side wall (11) that comes into contact with the reinforcing bar (20) is made by weaving PP (polypropylene) and PE (polyethylene) alternately.

5. The method for manufacturing a container bag having an integrated reinforcing bar according to claim 4, characterized in that the reinforcing bar (20) is made of PE, but has a density range of 0.9 to 0.95 g / cm³, a melting index of 0.3 to 1.0 g / 10 min, and a melting point in the range of 115 to 129°C.

6. A container bag having an integrated reinforcing bar, characterized by being manufactured by the manufacturing method described in any one of claims 1 to 5.

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