Manufacturing method of container bag having integrated reinforcing bar, and 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 integrated reinforcing bar, and a container bag manufactured by the method. In particular, the present invention relates to a method for manufacturing a container bag having an integrated reinforcing bar that improves the tensile strength of the octagonal integrated reinforcing bar, minimizes bulging, and improves adhesion between the reinforcing bar and the side wall (of the container bag) while ensuring waterproofing of the container bag, and a container bag manufactured by the method.

[0002] In the present invention, the reinforcing bar itself is made of a high-strength film, and the high-strength film has a density range of 0.9 to 0.95 g / cm 3 The present invention relates to a method for manufacturing a container bag having integral reinforcing bars, which is manufactured using a material having a melting index of 0.3 to 1.0 g / 10 min and a melting point in the range of 115 to 129°C, and which ensures smooth sealing while also ensuring rigidity against the load of the contents, and to the container bag manufactured by this method. [Background technology]

[0003] Generally, container bags are made of paper, fabric, or flexible synthetic resin materials to reduce weight, and can contain, store, and transport powdery or small particle-like contents such as grain, feed, cement, and synthetic resin raw materials.

[0004] Such a container bag can easily change its shape, so that it can be stored with its volume minimized (folded) when it is empty.

[0005] Furthermore, when transporting goods by air or sea, it is desirable to be able to load a large amount of cargo into a given space (container) in order to reduce logistics costs. However, when ordinary flexible container bags such as those described above are filled with contents, the weight of the contents causes the bags to bulge outward, making them less efficient in terms of space utilization.

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

[0007] One technique for reducing this bulging phenomenon is disclosed in Patent Document 1 and is illustrated in Figures 1 and 2. In this technique, internal lateral reinforcement sections 300, which are wide belt structures, are directly connected to the main body section 100 with stitching, which counteracts the force applied outward due to the weight of the contents and generates an inward force, thereby preventing the bulging phenomenon and maintaining the hexahedral shape well, which is also effective in keeping the container bag upright.

[0008] However, in the container bag described above, the internal lateral reinforcement portion 300 is directly connected to the main body portion 100 by sewing, which not only generates foreign matter such as residual sewing threads, making the sewing process time-consuming, but also makes the bag unsuitable for storing powdery materials that require waterproofing, such as rice, flour, and chemical materials. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Korean Patent Registration No. 10-1874264 Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention has been created to solve the above-mentioned problems, and its purpose is to provide a method for manufacturing a container bag with integrated reinforcing bars, in which the inside of the side wall of the container bag is coated with a first film and the reinforcing bars are attached by sealing, which, unlike the conventional method of fastening by sewing, prevents a decrease in waterproof function and enables the safe transport of contents that are sensitive to moisture, such as rice, flour, and chemical materials, and the container bag manufactured by this method.

[0011] Another object of the present invention is to provide a method for manufacturing a container bag having a plurality of reinforcing bars and attachment members, which improves the tensile strength of the reinforcing bars and attachment members, minimizes bulging, and improves adhesion between the reinforcing bars and attachment members and the container bag body while ensuring waterproofing of the container bag, and a container bag manufactured by the method. [Means for solving the problem]

[0012] To achieve the above object, the present invention provides a method for manufacturing a container bag comprising a rectangular tubular side wall member having four corners, a rectangular cross section, and separated from the outside by four side walls, and capable of accommodating contents, and reinforcing bars joined to the inner surface of each side wall so as to support the load of the contents, the method comprising: a) forming a first film by coating one surface of the side wall member with the same material as the side wall member, and forming the side wall member into a rectangular tube shape such that the first film is positioned inside; b) preparing the octagonal cylindrical reinforcing bar so as to form a connecting portion connecting each of the flat portions, so as to connect a flat portion arranged opposite to the central portion of each of the side walls and an adjacent side wall of the corner portion; c) forming a plurality of through holes at regular intervals in the connecting portion; and d) sealingly joining each of the planar portions to each of the side walls.

[0013] In addition, in the manufacturing method of the present invention, the side wall members and the reinforcing bars are both made of high-strength film, and the method further includes an outer bag that houses the side wall members and is woven with a flexible yarn.

[0014] The present invention, which achieves the above object, provides a method for manufacturing a container bag body, the method comprising: a rectangular tubular side wall member having four corners, a rectangular cross section, and separated from the outside by four side walls, for accommodating contents; and reinforcing bars joined to the inner surface of each side wall so as to support the load of the contents, the method comprising: a) transferring the sidewall member woven with a flexible yarn into a tube shape; b) transferring the tubular sidewall members flat so that their inner surfaces are in contact with each other; c) applying a molten thermoplastic resin material to the upper and lower surfaces of the sidewall member and cooling the material to form a first film; d) inverting the tubular sidewall member so that the first film is positioned on the interior side; e) preparing the octagonal cylindrical reinforcing bars so as to form connecting portions connecting the flat portions arranged opposite to the central portions of the side walls and the adjacent side walls of the corner portions; f) forming a plurality of through holes at regular intervals in the connecting portion; g) sealingly joining the planar portion to each of the side walls.

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

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

[0017] In the manufacturing method of the present invention, the reinforcing bars are made of PE (polyethylene), and the density range is 0.9 to 0.95 g / cm 3 The melting point of the resin is in the range 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 bar is made by weaving PP (polypropylene) and PE (polyethylene) alternately. [Effects of the Invention]

[0019] First, by coating the inner side of the container bag's side wall with the first film and attaching the reinforcing bars with a sealing joint, unlike conventional methods that use sewing, the waterproof function is prevented from deteriorating, and contents that are vulnerable to moisture, such as rice, flour, and chemical materials, can be transported safely.

[0020] Second, by weaving the reinforcing bars and the side walls, the tensile strength of the adjacent side walls to pull each other can be improved, thereby minimizing the bulge of the container bag.

[0021] In particular, the side wall members and reinforcing bars of the container bag are woven in a grid pattern, and one side of each element is coated with a thermoplastic resin film. When the elements are bonded together by heat and pressure, the molten film seeps into the gaps between the woven yarns and hardens, bonding the reinforcing bars together with the side walls of the container bag, enabling stable bonding of the reinforcing bars even when subjected to the load of the contents.

[0022] Thirdly, the portion of the side wall that comes into contact with the reinforcing bars is made by weaving PP (polypropylene) and PE (polyethylene) alternately. When the reinforcing bars are placed against each side wall and heat and pressure are applied, the PE portion of the side wall melts and mixes with the first and second films, ensuring not only waterproofing but also more stable adhesion of the reinforcing bars.

[0023] Fourth, the present invention also makes it possible to manufacture the reinforcing bars themselves from high-strength film, and to use high-strength film with a density in the range of 0.9 to 0.95 g / cm. 3 It is manufactured with a melting index of 0.3~1.0g / 10min and a melting point in the range of 115~129℃, which allows for smooth sealing and ensures resistance rigidity against the load of the contents. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is a perspective view showing a conventional container bag. [Figure 2] FIG. 2 is a perspective view of a main part of FIG. 1. [Figure 3] 1 is a perspective view showing a side wall member of a container bag according to an embodiment of the present invention. [Figure 4] FIG. 4 is a cross-sectional view of FIG. [Figure 5] FIG. 10 is a cross-sectional view showing a side wall member according to another embodiment. [Figure 6] FIG. 6 is an enlarged view of a main part of FIG. 5. [Figure 7] FIG. 7 is an exploded perspective view of the main part of FIG. 6. [Figure 8] FIG. 8 is a combined cross-sectional view of FIG. [Figure 9] FIG. 10 is a cross-sectional view of a main portion of a side wall member according to still another embodiment of the present invention. [Figure 10] 5A to 5C are diagrams illustrating a method of forming a first film on a side wall member. [Figure 11] FIG. 10 shows a pattern of sealing joints. [Figure 12] FIG. 10 is a cross-sectional view of a side wall member and an outer bag according to yet another embodiment. DETAILED DESCRIPTION OF THE INVENTION

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

[0026] The method of manufacturing the container bag is as follows: first, one surface of the side wall member 10 is coated with the same material as the side wall member 10 to form a first film 41; then, the first film 41 is positioned on the inside, and the side wall member 10 is formed into a rectangular tubular shape.

[0027] The side wall member 10 can also be made into a rectangular tube shape after applying a thermoplastic resin material to a flat fabric and cooling it to form the first film 41.

[0028] When the side wall member 10 is made by weaving synthetic resin yarn, the outer surface of the side wall member 10 may be coated with a film for waterproofing or to improve strength.

[0029] The reinforcing bar 20 is formed into an octagonal cylindrical shape so as to form a connecting portion 22 that connects each of the flat portions 21, so as to connect the flat portions 21 that are arranged opposite the central portion of each of the side walls 11 and the adjacent side walls 11 of the corner portion 11a.

[0030] The connecting portion 22 has a plurality of through holes 22a formed at regular intervals. Each of the flat portions 21 is sealed to each of the side walls 11 by a sealing joint S. The container bag manufactured as described above ensures waterproofness of the container bag, while improving the tensile strength of the octagonal integrated reinforcing bars 20, minimizing bulging, and improving adhesion between the reinforcing bars 20 and the side wall 11 of the container bag.

[0031] [Second embodiment] In the method for manufacturing the container bag of the second embodiment, both the side wall members 10 and the reinforcing bars 20 are made of high-strength film.

[0032] As shown in FIG. 12, an outer bag 100 woven with a soft yarn is disposed on the outside of the side wall member 10 to form a double bag.

[0033] The container bag manufactured as described above ensures the waterproofness of the container bag while improving the tensile strength of the octagonal integrated reinforcing bars 20 and minimizing bulging, and the woven outer bag 100 can protect the side wall member 10 from damage such as scratches and perforations caused by external forces.

[0034] When the outer bag 100 is made by weaving synthetic resin yarn, the outer surface of the outer bag 100 may be coated with a film for waterproofing or strength enhancement.

[0035] [Third embodiment] The third embodiment is another embodiment of the first embodiment, and will be described with reference to FIGS.

[0036] Referring to Figures 3 and 4 showing the side wall member 10 of the container bag of the first embodiment of the present invention, the side wall member 10 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 inlet through which contents are introduced at the center 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] The side wall member 10 has a ring (not shown) formed at the top end thereof for traction, and the cover and bottom portions are formed with an inlet and an outlet for the inlet and outlet of the contents.

[0038] The side wall member 10 of the container bag is made of a flexible material that can easily change its shape so that various contents such as grains, synthetic resin materials, minerals, powders such as cement, and chemicals can be stored in a minimized volume when no contents are stored, and can store the maximum amount of contents when the contents are stored.

[0039] For example, the side wall member 10 is made using PVC (polyvinyl chloride) or a synthetic resin material (PP (polypropylene), PE (polyethylene)), and is formed so as to maintain the outer shape and strength of the side wall member 10 even when the contents are filled inside.

[0040] The side wall member 10 is provided with a reinforcing bar 20 inside to prevent the container from expanding after the contents are poured into the container.

[0041] The reinforcing bars 20 are made of PVC or synthetic resin material (PP, etc.) like the side wall members 10, and maintain their octagonal shape after the contents are poured into the side wall members 10.

[0042] The reinforcing bars 20 are arranged opposite the central portions of the side walls 11, recessed between the side walls 11, and configured to be sealed with a sealing joint S, and connecting portions 22 connected at both ends of the flat portions 21 so as to connect two adjacent side walls 11 at the corner portions 11a. A plurality of through holes 22a are formed in the connecting portions 22 so that the contents to be put in can move smoothly toward the corner portions 11a, and the connecting portions 22 are not bonded to the side walls 11 with a sealing joint S.

[0043] The side wall member 10 of the container bag having the above-described structure is produced, for example, as follows.

[0044] 3, 4 and 10, the method for manufacturing the container bag includes forming the side wall member 10, which is woven with flexible PP (polypropylene) yarn or PE (polyethylene) yarn, into a tube shape and transferring the tubular side wall member 10, and transferring the transferred tubular side wall member 10 flat so that the inner surfaces of the tubular side wall member 10 are in contact with each other.

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

[0046] Next, the tubular sidewall member 10 is turned inside out so that the first film 41 is positioned on the inner side.

[0047] The thermoplastic resin material forming the first film 41 penetrates between the woven yarns during application, not only ensuring waterproofing but also preventing yarn waste from flowing into the interior where the contents are placed, thereby making the side wall member 10 sturdy.

[0048] Next, the flat surface 21 of each reinforcing bar 20 is brought into contact with each side wall 11, and a sealing joint S is formed.

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

[0050] In this case, the first film 41 not only ensures waterproofness, but also integrates the reinforcing bars 20 with the sidewalls 11, allowing stable attachment without peeling of the reinforcing bars 20 due to the load of the contents.

[0051] The sealing joint S can be implemented in various patterns as shown in FIG.

[0052] Referring to Figures 5 to 8 showing another embodiment of the present invention, a rectangular cylindrical 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 bar 20 is produced 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, the flat portions 21 of the reinforcing bars 20 are brought into contact with the side walls 11 and pressurized while applying heat. At this time, the molten films (first film 41, second film 42, third film 43) penetrate into the gaps between the woven yarns of the side walls 11 and the reinforcing bars 20, as shown in Fig. 8, and are cooled and hardened.

[0055] In this case, the reinforcing bars 20 and the side wall 11 of the container bag are integrated, allowing stable attachment without peeling of the reinforcing bars 20 due to the load of the contents.

[0056] Referring to FIG. 7, the sealing portion S of the side wall 11, which is in contact with the reinforcing bar 20 and sealed, is fabricated so that PP and PE are woven alternately.

[0057] In this case, when the flat portion 21 is abutted against each side wall 11 and pressure is applied while heat is applied, the PE portion of the side wall 11 melts and the first film 41 and the second film 42 are mixed, thereby 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 also the sealing portion S of the side wall 11 is formed by alternating PP and PE, so that the PE portion melts when heated and pressed, ensuring stable adhesion of the reinforcing bars 20.

[0059] FIG. 9 shows yet another embodiment of the present invention, in which the reinforcing bars 20 themselves are made of high-strength film. The high-strength film is made of PE, but with a density range of 0.9 to 0.95 g / cm. 3 The container is prepared 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, and the resistance rigidity against the load of the contents can be secured.

[0060] When the contents of the container bag manufactured as described above are placed in the side wall member 10, the weight of the contents will apply a load downward to the side wall member 10 and toward the side wall 11.

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

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

[0063] The load acting on each side wall 11 and the load acting on each corner portion 11a is supported by the reinforcing bars 20, and in this case, a mutual tensile force acts on the flat portion 21 and the connecting portion 22 of the reinforcing bars 20, preventing the bulging phenomenon of the side wall member 10.

[0064] The container bag of the present invention coats the side wall member 10 with a first film 41 and joins the reinforcing bars 20 to the side wall member 10 with a sealing joint, which, unlike conventional methods of fastening by sewing, prevents a decrease in waterproof function and enables 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 above-described embodiments, and it goes without saying that modifications can be made by a person having ordinary skill in the art to which the present invention pertains without departing from the scope of the claims of the present invention, and that such modifications fall within the scope of the present invention. [Industrial Applicability]

[0066] The method for manufacturing a container bag having an integral reinforcing bar of the present invention and the container bag manufactured thereby can be effectively applied to, for example, technical fields related to the storage / transportation of goods. [Explanation of symbols]

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

Claims

1. A method for manufacturing a container bag comprising a rectangular tubular side wall member (10) having four corners, a rectangular cross section, and separated from the outside by four side walls (11), for containing contents, and reinforcing bars (20) joined to the inner surface of each of the side walls (11) so as to support the load of the contents, a) forming a first film (41) on one surface of the side wall member (10) by coating the same material as the side wall member (10), and forming the side wall member (10) into a rectangular tubular shape with the first film (41) positioned inside; b) preparing the octagonal cylindrical reinforcing bar (20) so as to form a connecting portion (22) connecting each of the flat portions (21) arranged opposite to the central portion of each of the side walls (11) and the adjacent side walls (11) of the corner portion (11a); c) forming a plurality of through holes (22a) at regular intervals in the connecting portion (22); d) sealingly joining each of said planar portions (21) to each of said side walls (11).

2. 2. The method for manufacturing a container bag according to claim 1, wherein the side wall member (10) and the reinforcing bar (20) are both made of high-strength film, and the method further includes an outer bag (100) that houses the side wall member (10) and is woven with a flexible yarn.

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

4. 4. The method for manufacturing a container bag having integral reinforcing bars according to claim 3, characterized in that the reinforcing bars (20) are formed by applying a thermoplastic resin material to one side of the reinforcing bar fabric (23) facing the side wall (11) and cooling the resin material to form a second film (42).

5. 5. The method for manufacturing a container bag having integral reinforcing bars as described in claim 4, characterized in that a thermoplastic resin material is applied to the other surface of the reinforcing bar fabric (23) and cooled to form a third film (43).

6. 6. The method for manufacturing a container bag having an integrated reinforcing bar according to claim 5, wherein 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.

7. The reinforcing bars (20) are made of PE, with a density range of 0.9 to 0.95 g / cm ３ 7. The method for manufacturing a container bag having integral reinforcing bars according to claim 6, wherein the bag is manufactured under conditions of a melting index of 0.3 to 1.0 g / 10 min and a melting point of 115 to 129°C.

8. A container bag having integral reinforcement bars, characterized in that it is manufactured by the manufacturing method according to any one of claims 1 to 7.

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