Container bag and method for manufacturing container bag

Abstract

The present invention relates to a container bag and a method for manufacturing a container bag, the method comprising: a base material arrangement step in which a third base material and a fourth base material which are folded are arranged between a first base material and a second base material which are formed in a plate shape; a side surface sealing step in which the side surfaces of the first base material, the second base material, the third base material, and the fourth base material are sealed in a predetermined shape; an expansion step in which the first base material, the second base material, the third base material, and the fourth base material are cut into a predetermined shape, and the folded portions of the lower portions of the third base material and the fourth base material are spread outward; and a lower part sealing step for sealing the lower parts of the first base material, the second base material, the third base material, and the fourth base material, the container bag according to the present invention being provided with: an outer skin having a space therein and having an outer skin injection port and an outer skin discharge port, and a sealing step for sealing the lower parts of the first base material, the second base material, the third base material, and the fourth base material; a liner inserted into the outer skin and having an injection port and a discharge port; and a skirt attached to an outer side of the liner.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0074407, filed on June 9, 2023, and Korean Patent Application No. 10-2023-0084464, filed on June 29, 2023, which are hereby incorporated by reference for all purposes as if fully set forth herein. Technical Field

[0003] The present invention relates to a container bag and a method for manufacturing the container bag, and more particularly, to a container bag and a method for manufacturing the container bag, wherein the sealing force between the mother materials can be improved by unfolding and sealing the folded parts of the third mother material and the fourth mother material, and the skirt can prevent the contents from flowing into foreign matter or being contaminated when being discharged. Background Art

[0004] In general, a container bag is a packaging sack for transportation in which a certain weight of contents in the form of powder or granules is accommodated so that the contents can be efficiently transported through the container.

[0005] Such a container bag is constructed in the form of an inlet and an outlet respectively formed at the upper and lower parts of a main body having a right hexahedron shape, and the inlet is closed after the raw materials are filled into the inside of the main body through the inlet, and then the raw materials are transported in a state of being loaded in a container.

[0006] The container bag may include an outer skin and an inner liner inserted into the outer skin. In the existing container bag, the inner liner is sealed and then the contents are loaded in the inner liner, thereby transporting the contents.

[0007] However, when the contents are transported in a container bag, there is a risk that the contents may be discharged from gaps in the liner, and therefore it is necessary to increase the sealing force at the sealing liner. Summary of the invention

[0008] The present invention is used to solve the above-mentioned problems, and more particularly, relates to a container bag and a method for manufacturing the container bag, wherein the sealing force between the parent materials can be improved by unfolding and sealing the folded portion of the parent material, and the skirt can prevent the contents from flowing into foreign matter or being contaminated when being discharged.

[0009] The method for manufacturing a container bag of the present invention for solving the above-mentioned problems is characterized in that it includes a base material arrangement step of arranging a folded third base material and a fourth base material between a first base material and a second base material formed into a plate shape, a side sealing step of sealing the side surfaces of the first base material, the second base material, the third base material and the fourth base material into a specified shape, a cutting step of cutting the first base material, the second base material, the third base material and the fourth base material into a specified shape, an expansion step of unfolding the folded lower portions of the third base material and the fourth base material to the outside, and a lower sealing step of sealing the lower portions of the first base material, the second base material, the third base material and the fourth base material.

[0010] In the method for manufacturing a container bag of the present invention for solving the above-mentioned problems, in the lower portion sealing step, a sealed portion having a linear shape may be formed by sealing the lower portions of the first, second, third and fourth base materials in a linear shape.

[0011] In the method for manufacturing a container bag of the present invention for solving the above-mentioned problems, in the lower portion sealing step, a plurality of the sealing portions may be formed at the lower portions of the first base material, the second base material, the third base material, and the fourth base material.

[0012] The method for manufacturing a container bag of the present invention for solving the above-mentioned problems may further include a folding step of folding lower portions of the first mother material, the second mother material, the third mother material, and the fourth mother material after the lower portion sealing step.

[0013] In the method for manufacturing a container bag of the present invention for solving the above-mentioned problems, in the folding step, the lower portions of the first base material, the second base material, the third base material, and the fourth base material may be folded a plurality of times.

[0014] In the method for manufacturing a container bag of the present invention for solving the above-mentioned problems, in the folding step, the folded portion may be fixed by a fixing portion.

[0015] In the manufacturing method of the container bag of the present invention for solving the above-mentioned problems, a liner can be formed by the first mother material, the second mother material, the third mother material and the fourth mother material, and the method can further include a discharge port forming step of forming a discharge port in the lower part of the liner and a skirt attaching step of attaching a skirt to the outer side of the liner after the folding step.

[0016] In the method for manufacturing a container bag of the present invention for solving the above problems, the liner can be inserted into a skin having a space inside and provided with a skin injection port and a skin discharge port, and the skirt can protrude outside the skin discharge port.

[0017] The container bag of the present invention for solving the above-mentioned problems is a container bag into which contents such as powder or granules are inserted, and may include: an outer skin having a space inside thereof and provided with an outer skin injection port and an outer skin discharge port; an inner liner inserted in the outer skin and having an injection port and a discharge port; and a skirt attached to the outer side of the inner liner.

[0018] The skirt portion of the container bag of the present invention for solving the above-mentioned problems may protrude to the outside of the outer skin discharge port. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 4 is a process diagram of a method for manufacturing a container bag according to an embodiment of the present invention.

[0020] Figure 2 A diagram showing a step of configuring a base material according to an embodiment of the present invention.

[0021] Figure 3 1 is a diagram illustrating a side sealing step according to an embodiment of the present invention.

[0022] Figure 4 A diagram showing a sealing portion when a sealing step is performed without an expansion step.

[0023] Figure 5 A diagram illustrating an expansion step according to an embodiment of the present invention.

[0024] Figure 6 2 is a diagram illustrating a lower sealing step according to an embodiment of the present invention.

[0025] Figure 7 2 is a diagram showing a folding step according to an embodiment of the present invention.

[0026] Figure 8 1 is a diagram showing an outer skin and an inner lining according to an embodiment of the present invention.

[0027] Fig. 9 FIG. 1 is a diagram showing an outer skin and an inner lining to which a skirt is attached according to an embodiment of the present invention.

[0028] Fig.10 It is a diagram showing a state where an inner liner with a skirt attached thereto according to an embodiment of the present invention is inserted into an outer skin.

[0029] Fig.11 This is a diagram showing that a skirt is attached to the entire outer side of a liner according to an embodiment of the present invention.

[0030] Fig.12 A diagram showing a state in which an inner liner having a skirt formed on the entire outer side of the inner liner according to an embodiment of the present invention is inserted into an outer skin. DETAILED DESCRIPTION

[0031] In this specification, the principles of the present invention are described and embodiments are disclosed to make the scope of the appended claims of the present invention more clear and enable ordinary technicians of the present invention to implement the present invention. The disclosed embodiments can be implemented in various forms.

[0032] The expressions used in various embodiments of the present invention, such as "include" or "may include", etc., indicate the existence of the corresponding functions, operations or elements disclosed, etc., and do not limit the additional one or more functions, operations or elements, etc. In addition, in various embodiments of the present invention, terms such as "include" or "have", etc. should be understood to indicate the existence of the features, numbers, steps, operations, elements, parts or combinations thereof described in the specification, but do not exclude the possibility of the existence or addition of one or more other features, numbers, steps, operations, elements, parts or combinations thereof.

[0033] When an element is referred to as being "connected and combined" to another element, it should be understood that the element may be directly connected or combined to the other element, but other new elements may exist between the element and the other element. Conversely, when an element is referred to as being "directly connected" to another element, it should be understood that no other new elements exist between the element and the other element.

[0034] The terms "first", "second", etc. used in the present specification may be used to describe various elements, but these elements should not be limited by the terms. The terms are only used to distinguish one element from another element.

[0035] The present invention relates to a container bag and a method for manufacturing the container bag, and to a container bag and a method for manufacturing the container bag, wherein the sealing force between the parent materials can be improved by unfolding and sealing the folded portion of the parent materials, and the skirt can prevent the contents from flowing into foreign matter or being contaminated when discharged. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0036] Reference Figure 1 The manufacturing method of the container bag according to the embodiment of the present invention includes a mother material configuration step (S110), a side sealing step (S120), a cutting step (S130), an expansion step (S140), and a lower sealing step (S150).

[0037] Reference Figure 2 The matrix configuration step S110 is a step of arranging the folded third matrix 123 and the fourth matrix 124 between the first matrix 121 and the second matrix 122 formed into a plate shape.

[0038] According to an embodiment of the present invention, the first mother material 121 and the second mother material 122 are formed into a plate shape, and in the mother material configuration step S110, the first mother material 121 and the second mother material 122 are arranged to face each other in an unfolded state.

[0039] Reference Figure 2 The third mother material 123 and the fourth mother material 124 may have a shape formed by folding the plate-shaped first mother material 121 and the second mother material 122 in half. In the mother material configuration step S110, the third mother material 123 and the fourth mother material 124 folded between the first mother material 121 and the second mother material 122 may be arranged side by side.

[0040] The side sealing step (S120) is a step of sealing the side surfaces of the first base material 121, the second base material 122, the third base material 123, and the fourth base material 124 into a specified shape.

[0041] Reference Figure 3 In the side sealing step (S120), the upper and lower parts of the first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124 may not be sealed, and only the sides of the first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124 may be sealed into a specified shape.

[0042] In the side sealing step (S120), when the sides of the first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124 are sealed in a specified shape, the side sealing part 130 as a bonding point can be formed in a specified shape.

[0043] According to an embodiment of the present invention, the first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124 can be sealed in various ways. According to an embodiment of the present invention, the first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124 can be sealed by heating.

[0044] The first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124 respectively include an adhesive surface 125 and a non-adhesive surface 126, wherein the first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124 respectively have an adhesive surface 125 formed on one surface thereof, and the first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124 respectively have a non-adhesive surface 126 formed on the other surface thereof.

[0045] The adhesive surface 125 may be surfaces that adhere and seal to each other when heat is applied, and the non-adhesive surface 126 may be surfaces that do not adhere to each other even when heat is applied.

[0046] Specifically, when heat is applied to the adhesive surface 125 of the first mother material 121, the adhesive surface 125 of the third mother material 123, and the adhesive surface 125 of the fourth mother material 124 while in contact with each other, the adhesive surface 125 of the first mother material 121, the adhesive surface 125 of the third mother material 123, and the adhesive surface 125 of the fourth mother material 124 can be bonded and sealed to each other.

[0047] In addition, when heat is applied to the adhesive surface 125 of the second mother material 122, the adhesive surface 125 of the third mother material 123, and the adhesive surface 125 of the fourth mother material 124 while in contact with each other, the adhesive surface 125 of the second mother material 122, the adhesive surface 125 of the third mother material 123, and the adhesive surface 125 of the fourth mother material 124 can be bonded and sealed to each other.

[0048] The trimming step (S130) is a step of trimming the first mother material 121, the second mother material 122, the third mother material 123, and the fourth mother material 124 into a specified shape. In the trimming step (S130), the first mother material 121, the second mother material 122, the third mother material 123, and the fourth mother material 124 may be trimmed along the shape of the side sealing portion 130 formed in the side sealing step (S120).

[0049] Specifically, in the cutting step ( S130 ), the first base material 121 , the second base material 122 , the third base material 123 , and the fourth base material 124 may be cut along the outer side of the side sealing portion 130 .

[0050] In the cutting step (S130), when the first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124 are cut along the outer side of the side sealing portion 130, the first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124 can be formed into Figure 4 The specified shape shown.

[0051] After the trimming step (S130), the lower portions of the first mother material 121, the second mother material 122, the third mother material 123, and the fourth mother material 124 may be sealed. Figure 4As shown, after the trimming step ( S130 ), the sealing portion 10 and the bonding point 11 may be formed by sealing the lower portions of the first mother material 121 , the second mother material 122 , the third mother material 123 , and the fourth mother material 124 .

[0052] exist Figure 4 The 'A' portion in FIG. 1 is a front view of the lower portion of the first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124, and Figure 4 Part 'B' in FIG. 1 is a side view of the enlarged lower portion of the first mother material 121 , the second mother material 122 , the third mother material 123 , and the fourth mother material 124 .

[0053] Here, the sealing portion 10 may be a sealing point formed by heating, and the bonding point 11 may be an adhesive surface formed between the first mother material 121 and the third and fourth mother materials 123 and 124 and an adhesive surface formed between the second mother material 122 and the third and fourth mother materials 123 and 124.

[0054] like Figure 4 As shown, when the lower portions of the first matrix 121 , the second matrix 122 , the third matrix 123 , and the fourth matrix 124 are sealed, there is a problem that the sealing force becomes weak in the gap generated between the third matrix 123 and the fourth matrix 124 .

[0055] Reference Figure 4 As described above, since the third mother material 123 and the fourth mother material 124 are folded in half and arranged between the first mother material 121 and the second mother material 122, a gap may be generated between the third mother material 123 and the fourth mother material 124.

[0056] Since the third mother material 123 and the fourth mother material 124 are not sealed, the sealing force between the third mother material 123 and the fourth mother material 124 is inevitably weakened. Therefore, when the container bag is used, there is a risk that the contents leak from the gap formed between the third mother material 123 and the fourth mother material 124.

[0057] The method for manufacturing a container bag according to an embodiment of the present invention includes the expansion step (S140) to prevent the above problems. Figure 5 The expansion step (S140) is a step of unfolding the folded lower portions of the third mother material 123 and the fourth mother material 124 outward.

[0058] like Figure 5As shown, when the folded parts at the lower parts of the third mother material 123 and the fourth mother material 124 are unfolded outwards for sealing, the problem of weakening of the sealing force in the gap between the third mother material 123 and the fourth mother material 124 does not occur.

[0059] The lower portion sealing step ( S150 ) is a step of sealing the lower portions of the first mother material 121 , the second mother material 122 , the third mother material 123 , and the fourth mother material 124 after the expansion step ( S140 ).

[0060] Reference Figure 6 In the lower sealing step (S150), a linear sealing portion 140 and a bonding point 141 may be formed by sealing the lower portions of the first matrix 121, the second matrix 122, the third matrix 123 and the fourth matrix 124 in a linear shape.

[0061] exist Figure 6 The 'A' portion in FIG. 1 is a front view of the lower portion of the first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124, and Figure 6 Part 'B' in FIG. 1 is a side view of the enlarged lower portion of the first mother material 121 , the second mother material 122 , the third mother material 123 , and the fourth mother material 124 .

[0062] Here, the sealing portion 140 may be a sealing point formed by heating, and the bonding point 141 may be an adhesive surface formed between the first and second parent materials 121 and 122 and an adhesive surface formed between the third and fourth parent materials 123 and 124 .

[0063] In addition, according to an embodiment of the present invention, in the lower sealing step ( S150 ), a plurality of sealing portions 140 may be formed in the lower portions of the first mother material 121 , the second mother material 122 , the third mother material 123 , and the fourth mother material 124 .

[0064] When the lower portions of the first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124 are sealed after the expansion step (S140), Figure 5 and Figure 6 As shown, the adhesive surface 125 of the first mother material 121 is bonded to the adhesive surface 125 of the second mother material 122, and the adhesive surface 125 of the third mother material 123 is bonded to the adhesive surface 125 of the fourth mother material 124, and no gap occurs between the third mother material 123 and the fourth mother material 124.

[0065] Specifically, no gap occurs in the sealing portion 140 , and the bonding points 141 can be formed at all points inside the sealing portion 140 .

[0066] The method for manufacturing a container bag according to an embodiment of the present invention may further include a folding step (S160). Figure 7 The folding step (S160) is a step of folding the lower parts of the first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124 after the lower sealing step (S150).

[0067] In the folding step (S160) according to an embodiment of the present invention, the lower parts of the first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124 can be folded once, and the lower parts of the first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124 can also be folded multiple times.

[0068] As described above, in the folding step (S160), the lower parts of the first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124 are folded, so that the sealing force in the lower parts of the first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124 can be increased.

[0069] Reference Figure 7 The portion folded in the folding step (S160) may be fixed by a fixing portion 150. The fixing portion 150 may be a tape, but is not limited thereto. The fixing portion 150 may also be an adhesive.

[0070] Through the above-mentioned method for manufacturing a container bag according to an embodiment of the present invention, a liner 110 (see Figure 8 Specifically, through the above-mentioned method for manufacturing a container bag according to an embodiment of the present invention, the first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124 can be used to form the liner 110.

[0071] The manufacturing method of the container bag according to the embodiment of the present invention may further include a discharge port forming step (S170) and a skirt attaching step (S180). According to the embodiment of the present invention, the liner 110 may be formed using the first mother material 121, the second mother material 122, the third mother material 123 and the fourth mother material 124, and the discharge port forming step (S170) is a step of forming the discharge port 112 in the lower part of the liner 110 after the folding step (S160).

[0072] The skirt attachment step (S180) is to attach the skirt 160 (refer to Figure 8 ) is attached to the outer side of the liner 110. According to an embodiment of the present invention, the outer skin 210 (see FIG. 2 ) has a space inside and is provided with an outer skin injection port 211 and an outer skin discharge port 212. Figure 8 ), the liner 110 may be inserted into the outer skin 210. When the liner 110 is inserted into the outer skin 210, the skirt 160 may protrude to the outside of the outer skin discharge port 212.

[0073] In addition, according to an embodiment of the present invention, the skirt 160 may also be attached to the entire outer side of the liner 110. The skirt 160 may be attached to the injection port 111 (see Figure 8 ) to the entire outer side of the liner 110 of the discharge port 112. In the skirt attaching step (S180), the skirt 160 may be attached to the outer side of the liner 110 to protrude to the outer side of the outer skin injection port 211 and the outer side of the outer skin discharge port 212.

[0074] Specifically, when the liner 110 is inserted into the outer skin 210 , the skirt 160 attached to the liner 110 may protrude to the outside of the outer skin injection port 211 and the outside of the outer skin discharge port 212 .

[0075] The container bag according to an embodiment of the present invention may be a container bag into which contents such as powder or granules are inserted. Figure 8 The container bag according to the embodiment of the present invention may include an outer skin 210 , an inner liner 110 , and a skirt 160 .

[0076] The outer skin 210 has a space inside. The outer skin 210 may be provided with an outer skin injection port 211 and an outer skin discharge port 212. The outer skin injection port 211 and the outer skin discharge port 212 may be holes opened to the outside. The outer skin injection port 211 may be arranged at the upper part of the outer skin 210, and the outer skin discharge port 212 may be arranged at the lower part of the outer skin 210.

[0077] The liner 110 may be inserted into the inner space of the outer skin 210. The liner 110 may be manufactured by the above-mentioned method for manufacturing a container bag according to an embodiment of the present invention.

[0078] Reference Figure 8 The liner 110 may be inserted into the outer skin 210 and has an injection port 111 and a discharge port 112. The liner 110 has a space inside thereof, and contents such as powder or granules may be inserted into the inner space.

[0079] The injection port 111 and the discharge port 112 may be holes opened to the outside. The injection port 111 may be disposed at an upper portion of the liner 110 , and the discharge port 112 may be disposed at a lower portion of the liner 110 .

[0080] Contents such as powder or granules may be inserted into the inner space of the liner 110 through the injection port 111 , and the stored contents such as powder or granules may be discharged from the inner space of the liner 110 through the discharge port 112 .

[0081] Reference Fig. 9 , the skirt 160 is attached to the outer side of the liner 110. According to an embodiment of the present invention, the injection port 111 of the liner 110 may be configured inside the outer skin injection port 211 of the outer skin 210, and the discharge port 112 of the liner 110 may be configured inside the outer skin discharge port 212 of the outer skin 210.

[0082] Generally speaking, although the interior of the liner 110 is kept clean, the outer skin 210 is often kept unclean because it does not come into direct contact with the contents.

[0083] According to an embodiment of the present invention, when the contents stored in the liner 110 are discharged through the discharge port 112, there is a risk that the contents may come into contact with the outer skin 210 and foreign matter in the contents may flow in or be contaminated. The skirt 160 is configured to prevent this.

[0084] Reference Fig. 9 and Fig.10 The skirt 160 may be attached to the outer side of the discharge port 112 of the liner 110 , and the skirt 160 may protrude to the outer side of the outer skin discharge port 212 .

[0085] Specifically, when the liner 110 is inserted into the interior of the outer skin 210 , the skirt 160 attached to the liner 110 may protrude to the outside of the outer skin discharge port 212 .

[0086] As described above, since the skirt 160 attached to the liner 110 protrudes outside the outer skin discharge port 212, the contents stored in the liner 110 can be prevented from contacting the outer skin 210 when being discharged through the discharge port 112 and foreign matter in the contents flowing in or being contaminated.

[0087] According to an embodiment of the present invention, the skirt 160 may be attached to the outer side of the discharge port 112 of the liner 110, but is not limited thereto. Fig.11 , the skirt 160 may also be attached to the entire outer side of the liner 110 .

[0088] The skirt 160 may be attached to the entire outer side of the liner 110 from the injection port 111 to the discharge port 112 of the liner 110. Fig.12 The skirt 160 may protrude to the outside of the skin injection port 211 and the outside of the skin discharge port 212 .

[0089] Specifically, when the liner 110 is inserted into the outer skin 210 , the skirt 160 attached to the liner 110 may protrude to the outside of the outer skin injection port 211 and the outside of the outer skin discharge port 212 .

[0090] As described above, since the skirt 160 attached to the liner 110 protrudes to the outside of the outer skin injection port 211 and the outside of the outer skin discharge port 212, the contents stored in the liner 110 can be prevented from contacting the outer skin 210 and foreign matter in the contents flowing in or being contaminated when flowing in through the injection port 111 or being discharged through the discharge port 112.

[0091] The container bag and the method for manufacturing the container bag according to the embodiments of the present invention described above have the following effects.

[0092] In the container bag and the method for manufacturing the container bag according to the embodiment of the present invention, the sealing force between the parent materials can be improved by unfolding and sealing the folded portion of the parent material.

[0093] In addition, in the container bag and the method for manufacturing the container bag according to the embodiments of the present invention, by bonding the skirt protruding outside the outer skin to the lower portion of the liner, foreign matter can be prevented from flowing in and being contaminated by the skirt when discharging the contents.

[0094] The present invention relates to a container bag and a method for manufacturing the container bag, wherein the sealing force between parent materials can be improved by unfolding and sealing the folded portion of the parent material.

[0095] In the present invention, by bonding the skirt portion protruding outside the outer skin to the lower portion of the liner, the skirt portion can prevent foreign matter from flowing in and being contaminated when the contents are discharged.

[0096] Although certain exemplary embodiments and implementations have been described herein, other embodiments and modifications will be apparent from this description. Therefore, the inventive concept is not limited to these embodiments, but is limited to the broader scope of the appended claims, and various obvious modifications and equivalent arrangements will be apparent to those of ordinary skill in the art.

Claims

1. A method for manufacturing a container bag, the method comprising: a mother material arrangement step, in which a folded third mother material and a fourth mother material are arranged between a first mother material and a second mother material formed into a plate shape; A side sealing step, wherein the side surfaces of the first mother material, the second mother material, the third mother material, and the fourth mother material are sealed into a specified shape; a cutting step, wherein the first mother material, the second mother material, the third mother material and the fourth mother material are cut into a specified shape; an expansion step, wherein the folded lower portions of the third mother material and the fourth mother material are unfolded outward; and A lower portion sealing step, wherein the lower portions of the first mother material, the second mother material, the third mother material, and the fourth mother material are sealed.

2. The method according to claim 1, wherein: In the lower portion sealing step, a sealing portion having a linear shape is formed by sealing lower portions of the first base material, the second base material, the third base material, and the fourth base material in a linear shape.

3. The method according to claim 2, wherein: In the lower portion sealing step, a plurality of the sealing portions are formed at the lower portions of the first base material, the second base material, the third base material, and the fourth base material.

4. The method according to claim 2, further comprising a folding step after the lower sealing step, wherein: The lower portions of the first mother material, the second mother material, the third mother material, and the fourth mother material are folded.

5. The method according to claim 4, wherein: In the folding step, lower portions of the first mother material, the second mother material, the third mother material, and the fourth mother material are folded a plurality of times.

6. The method according to claim 4, wherein: In the folding step, the folded portion is fixed by a fixing portion.

7. The method according to claim 4, wherein: The lining is formed by the first mother material, the second mother material, the third mother material and the fourth mother material. The method further comprises, after the folding step, a discharge port forming step, wherein a discharge port is formed in a lower portion of the liner; and A skirt attaching step, wherein the skirt is attached to the outside of the liner.

8. The method according to claim 7, wherein: The liner is inserted into the outer skin having a space inside and provided with an outer skin injection port and an outer skin discharge port, and The skirt protrudes to the outside of the outer skin discharge port.

9. A container bag into which contents such as powder or granules are inserted, the container bag comprising: an outer skin, having a space therein and having an outer skin injection port and an outer skin discharge port; an inner liner inserted into the outer skin and having an injection port and an exhaust port; as well as A skirt is attached to the outside of the liner.

10. The container bag according to claim 9, wherein: The skirt protrudes to the outside of the outer skin discharge port.

Images