JP5540822B2 - Packaging bag manufacturing apparatus and manufacturing method thereof - Google Patents

Description

  The present invention relates to a packaging bag manufacturing method and a bag manufacturing apparatus, and more particularly, to a manufacturing method and a manufacturing method for efficiently and stably manufacturing a flexible packaging bag that is in close contact and difficult to close.

  Conventionally, as for detergents and seasonings, refill contents have been sold in film bags. If it does in this way, the container which became empty can be reused, protection of natural environment and effective utilization of resources can be aimed at.

In general, a packaging bag is manufactured from a printed film. That is, first, as shown in FIG. 5, the film wound on the original fabric is cut in the flow direction, and then the upper film 31 and the lower film 32 that have been cut are overlapped and conveyed by the feed roll 34. The bag 42 is manufactured by performing the bottom seal 35, the bottom seal cooling 36, the side seal 38, the corner cut 39, and the cutting 41.
Further, as shown in FIG. 6, a bag having a general self-supporting property (hereinafter referred to as a standing pouch) is composed of a total of three members, a bottom member 48 corresponding to the bottom surface of the standing pouch and a body member 47 on the side surface portion. Each member is heat-sealed to fill the contents. When manufacturing the above-mentioned standing pouch, as shown in FIG. 5, on the upstream side where the upper film 31 and the lower film 32 are overlapped, the bottom material 48 is folded with a triangular plate 33, punch holes are processed with the bottom punch 43, It is inserted between the film 31 and the lower film 32. After that, the bottom pouch 48 and the upper film 31 and the lower film 32 are fixed by the bottom seal 35 and the bottom seal cooling 36 in the same manner as above, and the standing pouch is manufactured by performing the side seal 38, the corner cut 39 and the cutting 41. The
In addition, bag making machines are used for manufacturing bags, and various bag making machines have been developed depending on the functions and types of the bags.

  For example, a soft packaging bag excellent in pouring property (see Patent Document 1) discloses a pouch that is provided with a folding portion at the extraction port to improve the pouring property of the liquid contents and to prevent the extraction port from being blocked. However, the manufacturing method is not specified.

JP 2008-18991 A

In the above conventional manufacturing method, since the two body members are overlapped, there is a problem that the pattern is shifted when the upper and lower print films are overlapped.
In addition, in the manufacturing method in which two body members are overlapped, the flexible packaging bag described in Patent Document 1 cannot be manufactured.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a packaging bag manufacturing apparatus and manufacturing method that are advantageous in efficiently and stably manufacturing a packaging bag excellent in appearance. .

  In order to achieve the above-mentioned object, the present invention has side portions opposed to each other, and the side portions are made of a single plastic film for body material, the upper portion of which is folded, and both side portions of the side portions are joined. The bottom part of the side part is a manufacturing apparatus for a packaging bag joined via a plastic film for a bottom material, and supplies a plastic film for a body material having a certain width with its length direction directed in the conveying direction. A base film supply unit, two base material plastic film supply units for supplying a base material plastic film having a certain width in a conveying direction, and the body plastic film and the base material Conveying means for conveying the plastic film, and the plastic film for the barrel supplied from the trunk film supply section, the width of the plastic film for the barrel The part divided into four in the width direction on both sides is folded over the part located in the middle of the width direction and is flattened so that the ends in the width direction face each other, so that the lower 1/4 cylinder From the guide part for the body forming the part where the upper 1/4 film piece for the material film is overlapped on the material film piece on both sides of the facing part, and the plastic film supply part for each bottom material The supplied plastic film for the bottom material is divided into two equal parts in the width direction of the plastic film for the bottom material and folded so that they face each other, so that the upper 1 / 2 Two bottom material guide portions that form a folded piece in which plastic film pieces for the bottom material are stacked, and two folded pieces obtained by the two bottom material guide portions are folded. Directed toward the portion where the upper 1/4 barrel film piece and the lower 1/4 barrel film piece are folded, and both ends in the width direction of the bottom plastic film, In a state where both ends in the width direction of the plastic film for the body are aligned, between the lower 1/4 body film piece and the upper 1/4 body film piece located on both sides of the facing portion. Temporarily insert the body plastic film and the bottom plastic film at two positions where the insertion guide portions to be inserted, and the body plastic film and the bottom plastic film are spaced apart in the length direction. Seal, and thereby insert the folded pieces between the lower 1/4 body film piece and the upper 1/4 body film piece located on both sides of the facing part. A temporary seal portion that maintains the inserted state, both ends in the width direction of the plastic films for the bottom material, the upper 1/4 film piece for the body facing the plastic film for the bottom material, and the lower 1/4 By joining the body film piece, and thereby joining the upper 1/4 body film piece, the lower 1/4 body film piece, and the folding piece, the bottoms that face each other are 2 A first seal portion to be formed, a second seal portion for joining the plastic film for body material and the plastic film for bottom material at the temporarily sealed portion, thereby forming the both side portions, and 2 It comprises a first cutting part that cuts between two bottom parts along the conveying direction, and a second cutting part that cuts along the direction orthogonal to the conveying direction at the both side parts.

Further, the present invention has side portions that face each other, the side portions are made of a single plastic film for a torso whose upper portion is folded, both side portions of the side portions are joined, and the bottom portion of the side portions is A method for manufacturing a packaging bag joined via a plastic film for a bottom material, the film supply process for a body material for supplying a plastic film for a body material having a certain width with its length direction directed in the conveying direction; A bottom film plastic film supply step for supplying a plastic film for a bottom material having a certain width with its length direction directed in a conveyance direction; a conveyance step for conveying the plastic film for a trunk material and the plastic film for a bottom material; The width of the plastic film for body supplied by the film supply process for body material is positioned on both sides in the width direction of the plastic film for body material Fold the part that is equally divided into four in the middle of the width direction into a flat shape so that the ends in the width direction face each other. A base material folding step of forming a portion where the upper 1/4 body film piece is overlapped on both sides of the facing portion, and a plastic for the bottom material supplied from each bottom plastic film supply section Divide the film into two equal parts in the width direction of the bottom plastic film and fold them so that they face each other, so that the upper half bottom plastic film on the lower half bottom plastic film piece a bottom member folded to form a folded piece pieces are stacked, the bottom member folded resulting -strand by step, the folded portion of the full for the upper 1/4 barrel member Toward the folded portion of the rum piece and the lower 1/4 body film piece, and both ends in the width direction of the plastic film for the bottom material, and both ends in the width direction of the plastic film for the body material In the state of being combined, an insertion guide step of inserting between the lower 1/4 barrel film piece and the upper 1/4 barrel film piece located on both sides of the facing portion, and for the barrel The plastic film for the base material and the plastic film for the bottom material are temporarily sealed at a place at a certain interval in the length direction of the plastic film and the plastic film for the bottom material, and thereby, on both sides of the facing part. A temporary sealing step of maintaining the state where the folded piece is inserted between the lower 1/4 barrel film piece and the upper 1/4 barrel film piece, Bonding both ends in the width direction of the plastic film for each bottom material, and the upper 1/4 barrel film piece and the lower 1/4 barrel film piece facing the plastic film for the bottom material, By joining the upper 1/4 body film piece, the lower 1/4 body film piece and the folding piece, thereby forming two bottom portions facing each other, and A second sealing step for joining the plastic film for the body material and the plastic film for the bottom material at the temporarily sealed portion, thereby forming the both side portions, and between the two bottom portions along the conveying direction. It includes a first cutting step for cutting, and a second cutting step for cutting along the direction orthogonal to the transport direction at the both side portions.

  According to the present invention, the lower 1/4 barrel film piece and the upper 1/4 barrel film piece are accurately maintained while maintaining the overlapping position of the lower 1/4 barrel film piece and the upper 1/4 barrel film piece. Since the folded piece can be inserted in a stable position between the 1/4 body film piece, it is advantageous in efficiently and stably manufacturing the packaging bag. Further, provisional sealing is advantageous in suppressing the occurrence of picture displacement. Further, by performing temporary sealing, it is advantageous in suppressing the shift of the pattern when the pattern is printed on both of the two side surfaces constituting the packaging bag.

(A) is the plane schematic diagram of the packaging bag which can be manufactured by this invention, (B) is sectional drawing explanatory drawing of the extraction port a. (A) is a schematic plane explanatory drawing of the principal part for demonstrating the structure of the manufacturing apparatus 100 of the packaging bag of embodiment, (B) is a top view which shows the insertion guide part U6. (A) is the schematic for demonstrating the form of the plastic film 5 for body materials, and the plastic film 10 for bottom materials, (B) is the cross-sectional explanatory drawing. (A) is a top view of guide part U5 for bottom materials and insertion guide part U6, (B) is an A arrow view of (A). It is a schematic side surface explanatory drawing of the principal part for demonstrating the structure of the manufacturing apparatus of a general packaging bag. It is a plane schematic explanatory drawing of a general packaging bag.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The plastic film used in this case has a base material that is difficult to heat-seal between the same material of AL foil, nylon, paper, etc., or the same material, and the inner surface base material is linear. Of the same materials such as low density polyethylene and ethylene vinyl acetate copolymer, a base material that is easily heat-sealed is used, and a multi-layer laminated base material in which a laminated state is formed is used.

Next, the manufacturing apparatus and manufacturing method of the packaging bag of this Embodiment are demonstrated in detail.
First, the packaging bag manufactured with the manufacturing apparatus of this Embodiment is demonstrated.
As shown in FIGS. 1 (A) and 1 (B), the packaging bag 24 has side parts 24A facing each other, and the side part 24A is a single plastic film 5 for body material (body material) whose upper part is folded. 5), the both side portions 24B of the side surface portion 24A are joined, and the bottom portion 24C of the side surface portion 24A is joined via the bottom material plastic film 10 (bottom material 10). That is, the bottom material plastic film 10 constitutes the bottom portion of the standing pouch.
In the figure, reference numeral 1 denotes a filling port of the packaging bag 24, and reference numeral 2 denotes an extraction port of the packaging bag 24.

Next, the packaging bag manufacturing apparatus 100 of the present embodiment will be described.
As shown in FIG. 2 (A), the manufacturing apparatus 100 includes a body film supply unit U1, two bottom material plastic film supply units U2, transport means U3, a body guide unit U4, and 2 Two bottom guide portions U5, two insertion guide portions U6, a temporary seal portion U7, a first seal portion U8, a second seal portion U9, a first cutting portion U10, and a second The cutting part U11 is included.

The body film supply unit U1 performs a body film supply process for supplying the body plastic film 5 having a certain width with its length direction directed in the transport direction.
In the present embodiment, the body plastic film 5 is unwound from the body film supply unit U1 without being cut.
The unrolled plastic film 5 for body material is processed by the embossing device 25 to further improve the pouring property, and is processed by the laser device 26 to improve the tearing property of the spout.

  The two bottom material plastic film supply units U2 perform a bottom material plastic film supply step of supplying the bottom material plastic film 10 having a certain width with its length direction directed in the transport direction.

The conveyance means U3 performs the conveyance process which conveys the plastic film 5 for trunk | drums, and the plastic film 10 for bottom materials.
In the present embodiment, the transport unit U3 includes a nip roll 8 and feed rolls 18 and 22 provided along the transport direction.

As shown in FIG. 3 (B), the body guide portion U4 is configured to place the body plastic film 5 supplied from the body film supply unit U1 on both sides of the body plastic film 5 in the width direction. The portion divided into four in the width direction is folded over the portion located in the middle of the width direction and is flattened so that the end portions in the width direction face each other, so that the lower 1/4 body film The body guide process is performed in which the portions where the upper 1/4 body film piece 5A is superimposed on the piece 5B are formed on both sides of the facing portions.
In the present embodiment, the trunk guide unit U4 includes a forming plate 6 and a plurality of guide rolls 7 for guiding the film.
The body plastic film 5 is folded from both side edges in the width direction by the forming plate 6 and is folded back to the position of the center line extending in the length direction of the body plastic film 5 by using the guide roll 7. The resulting plastic film 5 for the trunk is transported in the transport direction by the nip roll 8 positioned downstream of the guide roll 7.

As shown in FIG. 3B, the two bottom material guide portions U5 are arranged such that the bottom material plastic film 10 supplied from each bottom material plastic film supply unit U2 is the width of the bottom material plastic film 10. Folding piece 10C in which the upper half bottom plastic film piece 10A is stacked on the lower half bottom plastic film piece 10B is divided into two equal parts in the direction and folded so that they face each other. The bottom material guide process to be formed is performed.
In the present embodiment, the bottom material guide portion U5 has a triangular plate 9 for folding the bottom material plastic film 10 fed from the supply roll R1, as shown in FIG.
Further, the folded piece 10C formed by the bottom material guide portion U5 is subjected to bottom punch processing for ensuring self-supporting property using the punch device 11. In other words, the plastic film 10 for bottom material is self-supporting using the punch device 11 in a state where the plastic film piece 10A for the upper half bottom material is stacked on the plastic film piece 10B for the lower half bottom material. Bottom punching is performed to ensure

As shown in FIGS. 3A and 3B, the insertion guide portion U6 includes two folded pieces 10C obtained by the two bottom material guide portions U5, and the folded portion is the upper quarter cylinder. The film piece 5A for the material and the lower 1/4 film material 5B for the body material are directed to the folded portion, both ends of the bottom material plastic film 10 in the width direction, and the width direction of the material plastic film 5 for the material material The insertion guide process of inserting between the lower 1/4 barrel film piece 5B and the upper 1/4 barrel film piece 5A located on both sides of the facing portion in a state where both ends of the two are aligned. Is.
In this embodiment, as shown in FIGS. 2A, 2B, 4A, and 4B, the insertion guide portion U6 includes an opening jig 12, a bottom material insertion device 13, and a fold-in. And a jig 14.
The opening jig 12 is inserted between the overlapped lower 1/4 barrel film piece 5B and the upper 1/4 barrel film piece 5A, so that the lower 1/4 barrel film piece 5B The end portion of the upper 1/4 barrel film piece 5A overlaid is lifted and opened.
The bottom material insertion device 13 inserts the folding piece 10C in parallel with the transport direction.
The folding jig 14 superimposes the end portion of the upper 1/4 barrel film piece 5A opened by the opening jig 12 on the lower 1/4 barrel film piece 5B again.
Examples of the bottom material insertion device 13 are shown in FIGS. 4 (A) and 4 (B).
The bottom material insertion device 13 is provided between the lower 1/4 body film piece 5B and the upper 1/4 body film piece 5A opened by the body opening block 51 as the opening jig 12. The folding piece 10 </ b> C supplied from the material guide portion U <b> 4 via the bottom material bending roller 50 is inserted by the bottom material insertion plate 49. Adjustment of the insertion position of the folding piece 10 </ b> C is performed by changing the position of the bottom material insertion plate 49 by the bottom material insertion position adjustment jig 52.
By using such a bottom material insertion device 13, the folding piece 10C is inserted into a stable position between the lower 1/4 barrel film piece 5B and the upper 1/4 barrel film piece 5A. Is advantageous. Therefore, it is advantageous in manufacturing while avoiding the occurrence of problems such as misalignment and meandering of the plastic film 5 for body material, and elongation of the plastic film 5 for body material.

The temporary seal portion U7 temporarily seals the plastic film 5 for the bottom material and the plastic film 10 for the bottom material at a place spaced apart in the length direction of the plastic film 5 for the bottom material and the plastic film 10 for the bottom material, Thus, a temporary sealing step of maintaining the state in which the folded pieces 10C are inserted between the lower 1/4 barrel film piece 5B and the upper 1/4 barrel film piece 5A located on both sides of the facing portion. Is to do.
In the present embodiment, the temporary seal portion U7 includes a temporary seal unit 15 as shown in FIG.

As shown in FIG. 3 (A), the first seal portion U8 includes both ends in the width direction of each bottom material plastic film 10 and upper 1/4 body film pieces facing each bottom material plastic film 10. 5A and the lower 1/4 body film piece 5B are joined together, thereby joining the upper 1/4 body film piece 5A, the lower 1/4 body film piece 5B and the folded piece 10C. Thus, the first sealing step of forming two bottom portions 24C facing each other is performed.
In FIG. 3A, reference numeral 28 denotes a bottom seal that is a portion sealed by the first seal portion U8. Reference numeral 29 denotes a center line passing through the center in the width direction of the bottom material plastic film 10 and extending in the length direction of the bottom material plastic film 10. Reference numeral 30 denotes a folding position of the folding piece 10C.
In the present embodiment, as shown in FIG. 2A, the first seal portion U8 includes a bottom seal unit 16 that performs sealing, and a bottom seal cooling unit 18 that cools the seal portion. Yes.

The second sealing portion U9 performs a second sealing step in which the body plastic film 5 and the bottom plastic film 10 are joined at the temporarily sealed portion, thereby forming both side portions 24B.
In the present embodiment, as shown in FIG. 2A, the second seal portion U9 is configured by a plurality of side seal units 19 arranged at intervals in the transport direction on the downstream side of the feed roll 18. ing.

The 1st cutting part U10 performs the 1st cutting process of cut | disconnecting between the two bottom parts 24C along a conveyance direction.
In the present embodiment, as shown in FIG. 2A, the first cutting unit U <b> 10 includes a slit device 21.

The 2nd cutting part U11 cuts along the direction which intersects perpendicularly with the conveyance direction in both sides 24B, and performs the 2nd cutting process which obtains packaging bag 24 by this.
In the present embodiment, as shown in FIG. 2A, the second cutting portion U <b> 11 is configured with a shear cut 23 disposed on the downstream side of the feed roll 22.
In FIG. 2A, reference numeral 20 denotes a large punch or notch punch that punches the packaging bag 24.

As described above, according to the manufacturing apparatus 100 and the manufacturing method of the present embodiment, the upper 1/4 barrel film piece 5A is overlaid on the lower 1/4 barrel film piece 5B, and the lower A folded piece 10C in which the upper half bottom plastic film piece 10A is overlaid on the side half bottom plastic film piece 10B is formed, and the two folded pieces 10C are used for the lower quarter body. Insert between the film piece 5B and the upper 1/4 body film piece 5A, and seal the lower 1/4 body film piece 5B, the upper 1/4 body film piece 5A and the folding piece 10C. The packaging bag 24 is obtained by cutting.
Therefore, the lower 1/4 body film piece 5B and the upper 1 side film piece 5B and the upper 1/4 body film piece 5A are accurately maintained while maintaining the overlapping position of the lower 1/4 body film piece 5B and the upper 1/4 body film piece 5A. / 4 The folding piece 10C can be inserted into a stable position between the film piece 5A for the body material. Therefore, it is possible to avoid the occurrence of problems such as misalignment and meandering of the plastic film 5 for the trunk, and elongation of the plastic film 5 for the trunk, which is advantageous in efficiently and stably manufacturing the packaging bag 24. Become.
Moreover, in order to fix the position of the plastic film 5 for base materials and the plastic film 10 for base materials by performing the temporary sealing process by the temporary seal part U7, the position of the plastic film 5 for base materials and the plastic film 10 for base materials is fixed. The deviation of the relationship and the deviation of the positional relationship between the overlapped lower 1/4 barrel film piece 5B and the upper 1/4 barrel film piece 5A are suppressed.
Therefore, in order to carry out the first and second sealing steps in a state where the positional deviation between the lower 1/4 barrel film piece 5B and the upper 1/4 barrel film piece 5A is prevented, the packaging bag is used. In the case where a pattern is printed on both of the two side surface portions 24 </ b> A constituting the 24, it is advantageous for suppressing the shift of the pattern, and more advantageous for improving the appearance of the packaging bag 24.

DESCRIPTION OF SYMBOLS 1 ... Packing bag filling port 2 ... Packaging bag extraction port 5 ... Body plastic film 6 ... Forming plate 7 ... Guide roll 8 ... Nip roll 9 ... Triangle plate 10 ... Bottom material plastic film 11 ... Punch device 12 ... Bottom material Insertion device (body opening)
13 ... Bottom material insertion device (bottom material insertion)
14 ... Folding jig 15 ... Temporary seal unit 16 ... Bottom seal unit 17 ... Bottom seal cooling unit 18 ... Feed roll 19 ... Side seal unit 20 ... Large punch or notch punch 21 ... Slit device 22 ... Feed roll 23 ... Shear cut 24 ... Standing pouch 27 ... body 28 ... bottom seal 29 ... conveying film center 30 ... bottom material folding position 31 ... upper film 32 ... lower film 33 ... triangle plate 34 ... feed roll 35 ... bottom seal 36 ... bottom seal cooling 37 ... feed roll 38 ... side seal 39 ... corner cut 40 ... feed roll 41 ... cutting 42 ... bag 45 ... filling port 46 ... extraction port 47 ... body material 48 ... bottom material 49 ... bottom material insertion plate 50 ... bottom material folding roller 51 ... body material opening Block 52 ... Bottom material insertion position adjustment jig

Claims (2)

The side portions are formed of a single body plastic film having a folded upper portion, both side portions of the side portions are joined, and the bottom portion of the side portions is a plastic film for bottom materials. A packaging bag manufacturing apparatus joined via
A body film supply section for supplying a plastic film for a body having a certain width with its length direction directed in the conveying direction;
Two bottom film plastic film supply sections for supplying a plastic film for a bottom material having a certain width with its length direction directed in the conveying direction;
Conveying means for conveying the plastic film for the trunk and the plastic film for the bottom;
A portion in which the plastic film for body supplied from the film supply unit for body material is divided into four equal parts in the width direction located on both sides of the plastic film for body material in the width direction It is flattened so that the end in the width direction is opposed to each other by folding, and the location where the upper 1/4 barrel film piece is superimposed on the lower 1/4 barrel film piece, A body guide part formed on both sides of the facing part;
The bottom plastic film supplied from the bottom plastic film supply section is divided into two equal parts in the width direction of the bottom plastic film, and folded so that they face each other. Two bottom material guide portions forming a folded piece in which the upper half bottom material plastic film piece is superimposed on the material plastic film piece;
The two folded pieces obtained by the two bottom material guide portions are folded at the folded portion into the upper 1/4 body film piece and the lower 1/4 body film piece. The lower side located on both sides of the facing part in a state where both ends in the width direction of the plastic film for the bottom material and both ends in the width direction of the plastic film for the body material are aligned. Two insertion guides for insertion between the 1/4 barrel film piece and the upper 1/4 barrel film piece;
The plastic film for body material and the plastic film for bottom material are temporarily sealed at locations spaced apart from each other in the length direction of the plastic film for body material and the plastic film for bottom material. A temporary seal portion that maintains the state in which the folded pieces are inserted between the lower 1/4 body film piece and the upper 1/4 body film piece located on both sides of the place,
Bonding both ends in the width direction of the plastic film for each bottom material, and the upper 1/4 barrel film piece and the lower 1/4 barrel film piece facing the plastic film for the bottom material, By joining the upper 1/4 barrel film piece, the lower 1/4 barrel film piece and the folding piece, a first seal portion that forms two opposing bottom portions,
A second seal portion that joins the plastic film for body material and the plastic film for bottom material at the temporarily sealed portion, thereby forming the both side portions;
A first cutting portion that cuts between two bottom portions along the conveying direction;
A second cutting portion that cuts along the direction perpendicular to the conveying direction at the both side portions;
A device for manufacturing a packaging bag. The side portions are formed of a single body plastic film having a folded upper portion, both side portions of the side portions are joined, and the bottom portion of the side portions is a plastic film for bottom materials. A method for producing a packaging bag joined via
A body film supply step for supplying a plastic film for a body having a certain width with its length direction directed in the conveying direction;
A plastic film supply process for a bottom material that supplies a plastic film for a bottom material having a certain width with its length direction directed in the conveying direction;
A transporting process for transporting the plastic film for the trunk and the plastic film for the bottom;
A portion in which the plastic part film supplied in the film supplying step is divided into four parts in the width direction located on both sides in the width direction of the plastic film for the body part. It is flattened so that the end in the width direction is opposed to each other by folding, and the location where the upper 1/4 barrel film piece is superimposed on the lower 1/4 barrel film piece, The body folding process to be formed on both sides of the facing part,
The bottom plastic film supplied from the bottom plastic film supply section is divided into two equal parts in the width direction of the bottom plastic film, and folded so that they face each other. A bottom material folding step of forming a folded piece in which a plastic film piece for an upper half base material is overlaid on a plastic film piece for a material;
The folded piece obtained by the bottom material folding step, the folded part is directed to the part where the upper 1/4 body film piece and the lower 1/4 body film piece are folded, And the lower 1/4 trunk | drum located in the both sides of the said facing part in the state which match | combined the width direction both ends of the said plastic film for base materials, and the both ends of the width direction of the said plastic film for trunk | drums An insertion guide step of inserting between the film piece for upper and the film piece for the upper quarter body,
The plastic film for body material and the plastic film for bottom material are temporarily sealed at locations spaced apart from each other in the length direction of the plastic film for body material and the plastic film for bottom material. A temporary sealing step of maintaining the state in which the folded pieces are inserted between the lower 1/4 body film piece and the upper 1/4 body film piece located on both sides of the place,
Bonding both ends in the width direction of the plastic film for each bottom material, and the upper 1/4 barrel film piece and the lower 1/4 barrel film piece facing the plastic film for the bottom material, By joining the upper 1/4 barrel film piece, the lower 1/4 barrel film piece and the folded piece, thereby forming two bottom portions facing each other;
A second sealing step of joining the body plastic film and the bottom plastic film at the temporarily sealed portion, thereby forming the both side portions;
A first cutting step of cutting between two bottom portions along the transport direction;
A second cutting step for cutting along the direction perpendicular to the conveying direction at the both side portions;
The manufacturing method of the packaging bag characterized by including.

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