JP2018114986A - Packaging bag and usage thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag with improved convenience.SOLUTION: A packaging bag 1, which is made of laminate 30 tearable in one direction, consists of a front part 3, a back part 4 facing the front part 3 and a gusset part 5 which connects upper ends of both of the front part 3 and the back part 4. The bag has first end sealing parts 11 which are provided by bonding the front part 3 and the back part 4 at their side ends, second end sealing parts 12, extending from the first end sealing parts 11, which are provided by bonding the front part 3 and the gusset part 5 at their side ends, and third end sealing parts 13, extending from the first end sealing parts 11, which are provided by bonding the back part 4 and the gusset part 5 at their side ends, and the tearable direction of the laminate 30 is at the right angle of the first end sealing part 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging bag having a gusset portion and a method for using the packaging bag.

  A conventional packaging bag is disclosed in Patent Document 1. This packaging bag is formed into a gusset type by a laminate having at least a base material layer and a heat bonding layer. The back side of the packaging bag is thermally bonded by a back seal part in which the laminated body is bonded together. Both side edges orthogonal to the back seal part are thermally bonded by a pair of end seal parts. In addition, an opening start portion made of a notch is provided on the back seal portion. On both sides of the back seal portion, straight opening cuts parallel to the back seal portion are formed by a cutting blade or the like.

  When the back seal part is gripped on both sides of the opening start part and pulled in opposite directions, the laminate is torn in the direction intersecting the back sealing part from the opening start part. When the cutting line by tearing reaches the opening cut, the laminate is torn along the opening cut in parallel to the back seal portion. Thereby, the opening opening extended in the longitudinal direction of a back seal part is formed, and a packaging bag can be opened easily and the contents can be taken out.

JP 2008-254800 A (Pages 4-7, FIG. 4)

  However, according to the conventional packaging bag, since the opening cut is provided, the strength of the packaging bag is lowered. For this reason, when an impact force or a pressing force is applied to the opening cut line during transport of the packaging bag, the packaging bag may be opened from the opening cut line. Therefore, there is a problem that the convenience of the packaging bag is poor.

  An object of this invention is to provide the packaging bag which can improve the convenience, and its usage method.

  In order to achieve the above object, the present invention is formed by a laminate having tearability in one direction, and includes a front surface portion, a back surface portion facing the front surface portion, an upper end of the front surface portion, and an upper end of the back surface portion. In a packaging bag comprising a gusset portion for connecting the front end portion and the back end portion, the front end portion and the front end portion are connected to the first end seal portion. A second end seal portion bonded to both ends of the gusset portion, and a third end seal portion bonded to the back portion and the gusset portion at both ends in succession to the first end seal portion, The direction of easy tearing of the laminate is perpendicular to the first end seal portion.

  According to this configuration, the packaging bag is torn and opened in an orthogonal direction from above the first end seal portion, the second end seal portion, or the third end seal portion. Further, when the packaging bag is torn from above the second end seal portion or the third end seal portion, the packaging bag can be folded back at the lower end of the second end seal portion or the third end seal portion.

  Moreover, this invention is the packaging bag of the said structure, The said laminated body contains the uniaxially stretched film, It is characterized by the above-mentioned.

  Moreover, this invention is the packaging bag of the said structure, The said laminated body is characterized by including a metal foil or a metal vapor deposition film.

  According to the present invention, in the packaging bag having the above-described configuration, an opening start portion capable of starting opening is provided in at least one of the second end seal portion and the third end seal portion. According to this configuration, the laminate is torn in the direction perpendicular to the second end seal portion or the third end seal portion, starting from the opening start portion.

  According to the present invention, in the packaging bag having the above-described configuration, a marking for instructing opening is provided on the second end seal portion or the third end seal portion provided with the opening start portion.

  Moreover, the present invention is characterized in that, in the packaging bag configured as described above, the opening start portion extends on the first end seal portion. According to this configuration, the contents can be easily taken out by tearing the packaging bag from the opening start portion on the first end seal portion according to the consumption of the contents.

  Moreover, this invention tears the said laminated body from the said 2nd end seal part or the said 3rd end seal part in the usage method of the packaging bag in any one of said each structure in an easily tearable direction, and opens it. It is characterized by that.

  According to the present invention, in the method of using the packaging bag having the above-described configuration, the packaging bag opened from the second end seal portion or the third end seal portion is disposed at the lower end of the second end seal portion. Or by closing the back surface portion at the lower end of the third end seal portion.

  According to the present invention, since the easily tearable direction of the laminate having tearability in one direction is perpendicular to the first end seal portion, an opening that extends in the direction perpendicular to the first end seal portion is easily formed. be able to. In addition, since the opening cut as in the conventional example is not formed, the opening of the packaging bag can be prevented even if an impact force or a pressing force is applied to the packaging bag during transportation or the like. Further, when the packaging bag is opened from above the second end seal portion or the third end seal portion, the packaging bag can be easily closed by folding back at the lower end of the second end seal portion or the third end seal portion. Therefore, the convenience of the packaging bag can be improved.

The perspective view which shows the packaging bag of 1st Embodiment of this invention. Side surface sectional drawing which shows the packaging bag of 1st Embodiment of this invention. Sectional drawing which shows the laminated body which forms the packaging bag of 1st Embodiment of this invention. The perspective view which shows the state at the time of opening of the packaging bag of 1st Embodiment of this invention. Side surface sectional view which shows the state at the time of opening of the packaging bag of 1st Embodiment of this invention Side surface sectional drawing which shows the state closed after opening of the packaging bag of 1st Embodiment of this invention The perspective view which shows the packaging bag of 2nd Embodiment of this invention. Side surface sectional drawing which shows the packaging bag of 2nd Embodiment of this invention. The perspective view which shows the packaging bag of 3rd Embodiment of this invention.

<First Embodiment>
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a perspective view and a side sectional view of the packaging bag of the first embodiment. The packaging bag 1 is formed into a gusset type by a sheet-like laminate 30 (see FIG. 3) and encloses contents such as food and medicine.

  The packaging bag 1 has a front surface portion 3 and a back surface portion 4 that face each other. The upper end of the front surface portion 3 and the upper end of the back surface portion 4 are connected by a gusset portion 5. The lower end of the front surface portion 3 and the lower end of the back surface portion 4 are connected by a gusset portion 6. Usually, the lateral width of the front surface portion 3 and the back surface portion 4 is formed larger than the height.

  Both side ends of the front surface portion 3 and both side ends of the back surface portion 4 are thermally bonded by the first end seal portion 11. Both side ends of the gusset portion 5 and both side ends of the front surface portion 3 are thermally bonded by a second end seal portion 12 continuous with the first end seal portion 11. Both side ends of the gusset portion 5 and both side ends of the back surface portion 4 are thermally bonded by a third end seal portion 13 continuous with the first end seal portion 11.

  Similarly, both side ends of the gusset portion 6 and both side ends of the front surface portion 3 are thermally bonded by a second end seal portion 12 that is continuous with the first end seal portion 11. Both side ends of the gusset portion 6 and both side ends of the back surface portion 4 are thermally bonded by a third end seal portion 13 continuous with the first end seal portion 11.

  The front end and the rear end of the gusset portion 5 are thermally bonded to the upper end of the front surface portion 3 and the upper end of the back surface portion 4 by a hem seal portion 16, respectively. The hem seal portion 16 on the front surface portion 3 connects the left and right second end seal portions 12, and the hem seal portion 16 on the back surface portion 4 connects the left and right third end seal portions 13. Similarly, the front end and the rear end of the gusset portion 6 are thermally bonded to the lower end of the front surface portion 3 and the lower end of the back surface portion 4 by the hem seal portion 17, respectively. The hem seal portion 17 on the front surface portion 3 connects the left and right second end seal portions 12, and the hem seal portion 17 on the back surface portion 4 connects the left and right third end seal portions 13.

  The outer edges of the first end seal portion 11, the second end seal portion 12, and the third end seal portion 13 are cut in a sawtooth shape, and a plurality of opening start portions 20 capable of starting opening are formed by the serrated valley portion. . You may form the opening start part 20 by V notch, U notch, or I notch. Further, the opening start portion 20 may be formed by a large number of fine holes penetrating the first end seal portion 11, the second end seal portion 12, and the third end seal portion 13.

  The second end seal portion 12 on the front surface portion 3 and the third end seal portion 13 on the back surface portion 4 are formed with markings 21 such as arrows for instructing opening facing the opening start portion 20 by printing. . The marking 21 may be provided on the second end seal portion 12 or the third end seal portion 13 on the gusset portion 5.

  FIG. 3 shows a cross-sectional view of the laminate 30 that forms the sheet 2. The laminate 30 is formed by laminating a base material layer 31, an intermediate layer 32, and a thermoadhesive resin layer 33 in order from the outer surface side. As the base material layer 31, a polypropylene film, a polyethylene terephthalate film, a nylon film, or the like can be used.

  The intermediate layer 32 has gas barrier properties, and a metal foil (aluminum foil or the like), a metal vapor deposition film, an oxide vapor deposition film, or the like can be used. A metal vapor deposition film is formed by vapor-depositing a metal such as aluminum on a resin film such as a polyethylene terephthalate film. The oxide deposited film is formed by depositing an oxide such as aluminum oxide or silicon oxide on a resin film such as polyethylene terephthalate film.

  The thermal adhesive resin layer 33 has thermal adhesiveness. The opposing heat-adhesive resin layer 33 is thermally bonded to form the first end seal portion 11, the second end seal portion 12, the third end seal portion 13, the hem seal portion 16, and the hem seal portion 17. As the heat-adhesive resin layer 33, a low density polyethylene film, a medium density polyethylene film, a linear low density polyethylene film, an ethylene-α olefin copolymer polymerized using a single site catalyst, an ethylene-vinyl acetate copolymer, polypropylene A film or the like can be used.

  Moreover, the laminated body 30 has easy tearability in one direction. When at least one of the base material layer 31, the intermediate layer 32, and the thermoadhesive resin layer 33 has easy tearability, the laminate 30 can be easily tearable. As the easily tearable film, a uniaxially stretched polyethylene terephthalate film, a uniaxially stretched polypropylene film or the like that is easily tearable in the stretching direction can be used.

  The packaging bag 1 is manufactured by conveying a sheet-like laminate 30 having tearability in the MD direction (flow direction). At this time, the hem seal portion 16 and the hem seal portion 17 are formed in parallel with the MD direction. Moreover, the 1st end seal part 11, the 2nd end seal part 12, and the 3rd end seal part 13 are formed perpendicularly to MD direction.

  4 and 5 are a perspective view and a side sectional view showing a state when the packaging bag 1 is opened. For example, the packaging bag 1 is torn in parallel with the hem seal portion 16 with the opening start portion 20 provided in the second end seal portion 12 as a starting point.

  Thereby, an opening 22 is formed at the upper end of the packaging bag 1. At this time, since the easily tearable direction of the laminate 30 is orthogonal to the first end seal portion 11, the packaging bag 1 can be easily torn parallel to the hem seal portion 16.

  The gusset type packaging bag 1 usually has a width (length in a direction perpendicular to the first end seal portion 11) greater than a height (length in a direction parallel to the first end seal portion 11). For this reason, the wide opening 22 can be formed and the contents can be easily taken out.

  As shown in FIG. 6, the packaging bag 1 opened from the second end seal portion 12 can be easily closed by folding the front surface portion 3 at the lower end of the second end seal portion 12. When the packaging bag 1 is bent on the first end seal portion 11, the two laminated bodies 30 of the front surface portion 3 and the back surface portion 4 are bent. For this reason, the packaging bag 1 is easy to return to the state before bending by the repulsive force of the laminated body 30, and the packaging bag 1 cannot be closed.

  On the other hand, when the front surface portion 3 is folded back at the lower end (boundary with the first end seal portion 11) of the second end seal portion 12, the single laminate 30 is bent, and the gusset portion 5 is substantially planar. Arranged. For this reason, while the repulsive force of the laminated body 30 becomes small, repulsion is suppressed by the gusset part 5. Thereby, the packaging bag 1 is hard to return to the state before bending, and the packaging bag 1 can be closed reliably.

  At this time, it is more preferable that the intermediate layer 32 is formed of a metal foil or a metal vapor-deposited film because the state in which the front surface portion 3 is folded back can be easily maintained.

  When the contents in the packaging bag 1 are consumed, the packaging bag 1 is resumed from the opening start portion 20 on the first end seal portion 11 as a starting point. Thereby, the opening 22 is formed in a low position, the contact between the back of the user's hand and the inner surface of the packaging bag 1 can be prevented, and the contents can be easily taken out.

  Similarly, when the packaging bag 1 is opened from the opening start portion 20 provided in the third end seal portion 13, the packaging bag 1 is similarly torn and opened in parallel with the hem seal portion 16. The opened packaging bag 1 can be closed by folding the back surface portion 4 at the lower end of the third end seal portion 13. Further, the packaging bag 1 may be torn and opened from the opening start portion 20 on the first end seal portion 11.

  According to the present embodiment, since the easily tearable direction of the laminate 30 that is easily tearable in one direction is perpendicular to the first end seal portion 11, the opening 22 that extends in the direction perpendicular to the first end seal portion 11. Can be easily formed. Usually, the lateral width of the packaging bag 1 (the length in the direction orthogonal to the first end seal portion 11) is larger than the height (the length in the direction parallel to the first end seal portion 11). For this reason, the wide opening 22 is formed and the contents can be taken out easily.

  In addition, since the opening cut as in the conventional example is not formed, the opening of the packaging bag 1 can be prevented even when an impact force or a pressing force is applied to the packaging bag 1 during transportation. Further, when the packaging bag 1 is opened from above the second end seal portion 12 or the third end seal portion 13, the packaging bag 1 can be simply folded by folding back at the lower end of the second end seal portion 12 or the third end seal portion 13. Can be closed. Therefore, the convenience of the packaging bag 1 can be improved.

  Similarly, when the height of the packaging bag 1 is larger than the lateral width, the opening 22 that extends in the direction orthogonal to the first end seal portion 11 can be easily formed. For this reason, when the packaging bag 1 is opened from above the second end seal portion 12 or the third end seal portion 13, the packaging bag 1 is simply folded at the lower end of the second end seal portion 12 or the third end seal portion 13. Can be closed.

  Moreover, the packaging body 1 which has easy tearability in the direction orthogonal to the 1st end seal part 11 is easily realizable because the laminated body 30 contains a uniaxially stretched film.

  Moreover, it becomes easy to hold | maintain the state which bent the laminated body 30 because the laminated body 30 contains metal foil or a metal vapor deposition film. For this reason, the front surface part 3 of the packaging bag 1 opened from above the second end seal part 12 can be folded back at the lower end of the second end seal part 12 and kept closed. In addition, the back surface portion 4 of the packaging bag 1 opened from above the third end seal portion 13 can be folded back at the lower end of the third end seal portion 13 to be kept closed.

  Moreover, since the opening start part 20 which can start opening is provided in the 2nd end seal part 12 and the 3rd end seal part 13, the packaging bag 1 is easy from the 2nd end seal part 12 or the 3rd end seal part 13 Can be opened.

  In addition, since the marking 21 for instructing opening is provided on the second end seal portion 12 and the third end seal portion 13 provided with the opening start portion 20, the second end seal portion 12 or the third end seal portion 13 can be used. The packaging bag 1 can be opened more easily. The opening start portion 20 and the marking 21 may be provided only on one of the second end seal portion 12 and the third end seal portion 13.

  Moreover, since the opening start part 20 is extended on the 1st end seal part 11, the packaging bag 1 which consumed the content can be easily restarted from on the 1st end seal part 11. FIG.

Second Embodiment
Next, FIG.7 and FIG.8 has shown the perspective view and side sectional drawing of the packaging bag 1 of 2nd Embodiment. For convenience of explanation, the same reference numerals are given to the same parts as those in the first embodiment shown in FIGS. In this embodiment, the hem seal portion 16 and the hem seal portion 17 (see FIG. 1) are omitted, and the back seal portion 14 is provided. Other parts are the same as those in the first embodiment.

  The packaging bag 1 has a front surface portion 3 and a back surface portion 4 that face each other. The upper end of the front surface portion 3 and the upper end of the back surface portion 4 are connected by a gusset portion 5. The lower end of the front surface portion 3 and the lower end of the back surface portion 4 are connected by a gusset portion 6.

  A laminated body 30 (see FIG. 2) forming the packaging bag 1 is formed in a cylindrical shape by applying a palm at the back seal portion 14. The cylindrical laminated body 30 is bent at four locations in the circumferential direction, and the front surface portion 3, the gusset portion 5, the back surface portion 4, and the gusset portion 6 are continuously provided. And the 1st end seal part 11, the 2nd end seal part 12, and the 3rd end seal part 13 are formed by thermal bonding perpendicularly to back seal part 14. The easily tearable direction of the laminated body 30 is parallel to the back seal portion 14 and orthogonal to the first end seal portion 11.

  Also in the present embodiment, as in the first embodiment, since the easy tearing direction of the laminate 30 is orthogonal to the first end seal portion 11, the opening 22 that extends in the direction orthogonal to the first end seal portion 11 is provided. It can be formed easily. Further, when the packaging bag 1 is opened from above the second end seal portion 12 or the third end seal portion 13, the packaging bag 1 can be simply folded by folding back at the lower end of the second end seal portion 12 or the third end seal portion 13. Can be closed.

<Third Embodiment>
Next, FIG. 9 has shown the perspective view of the packaging bag 1 of 3rd Embodiment. For convenience of explanation, the same reference numerals are given to the same parts as those in the first embodiment shown in FIGS. In the present embodiment, the bottom gusset portion 6 (see FIG. 2) is omitted. Other parts are the same as those in the first embodiment.

  At the lower end of the packaging bag 1, the front surface portion 3 and the back surface portion 4 are continuously provided by bending the laminated body 30. Thereby, since the bottom gusset portion 6 (see FIG. 2) is omitted, the unsealed packaging bag 1 is placed side by side with the front surface portion 3 or the back surface portion 4 in contact with the installation surface.

  Also in the present embodiment, as in the first embodiment, since the easy tearing direction of the laminate 30 is orthogonal to the first end seal portion 11, the opening 22 that extends in the direction orthogonal to the first end seal portion 11 is provided. It can be formed easily. Further, when the packaging bag 1 is opened from above the second end seal portion 12 or the third end seal portion 13, the packaging bag 1 can be simply folded by folding back at the lower end of the second end seal portion 12 or the third end seal portion 13. Can be closed.

  In the present embodiment, the lower end of the front surface portion 3 and the lower end of the back surface portion 4 may be thermally bonded. Further, similarly to the second embodiment, the hem seal portion 16 may be omitted and the back seal portion 14 (see FIG. 8) may be provided.

  The example formed in order to evaluate the packaging bag 1 below is described.

  Example 1 is formed by the packaging bag 1 of the first embodiment. The width of the packaging bag 1 is 15 cm, the height is 13 cm, and the depth of the gusset portion 5 is 2.5 cm. The base material layer 31 of the laminate 30 is made of a uniaxially stretched polyethylene terephthalate film (Unitika Ltd., Emblet (registered trademark)) having a thickness of 12 μm. The intermediate layer 32 is made of an aluminum-deposited polyethylene terephthalate film (VM-PET 1310, manufactured by Toray Industries, Inc.) having a thickness of 12 μm. The heat-adhesive resin layer 33 is made of a linear short-chain branched polyethylene film (XMTN, manufactured by Phutamura Chemical Co., Ltd.) having a thickness of 30 μm.

  The second embodiment is formed by the packaging bag 1 having the same outer shape as the first embodiment. The base material layer 31 of the laminate 30 is made of a biaxially stretched polyethylene terephthalate film (E5100, manufactured by Toyobo Co., Ltd.) having a thickness of 12 μm. The intermediate layer 32 is made of an aluminum foil (JIS 1N30) having a thickness of 7 μm. The heat-adhesive resin layer 33 is made of a uniaxially stretched polypropylene film (Dai Nippon Printing Co., Ltd., IL-CUT (registered trademark)) having a thickness of 30 μm.

  The third embodiment is formed by the packaging bag 1 having the same outer shape as the first embodiment. The base material layer 31 and the thermal adhesive resin layer 33 of the laminate 30 are the same as those in the first embodiment. The intermediate layer 32 is made of a 12 μm thick aluminum oxide vapor-deposited polyethylene terephthalate film (manufactured by Toray Industries, Inc., Barrier Lock (registered trademark) 1011HGCR).

  The fourth embodiment is formed by the packaging bag 1 having the same outer shape as the first embodiment. The base material layer 31 and the thermoadhesive resin layer 33 of the laminate 30 are the same as those in Example 2. The intermediate layer 32 is made of an aluminum oxide-deposited polyethylene terephthalate film (barrier locks (registered trademark) 1011HGCR, manufactured by Toray Industries, Inc.) having a thickness of 12 μm.

[Comparative Example 1]
Moreover, the packaging bag 1 for a comparison was created. Comparative Example 1 is formed by a packaging bag 1 having the same outer shape as that of Example 1. The intermediate layer 32 and the thermoadhesive resin layer 33 of the laminate 30 are the same as those in the first embodiment. The base material layer 31 is made of a biaxially stretched polyethylene terephthalate film (E5100, manufactured by Toyobo Co., Ltd.) having a thickness of 12 μm.

[Comparative Example 2]
Comparative Example 2 is formed by a packaging bag 1 having the same outer shape as that of Example 1. The base material layer 31 and the intermediate layer 32 of the laminate 30 are the same as those in the second embodiment. The heat-adhesive resin layer 33 is made of a linear short-chain branched polyethylene film (XMTN, manufactured by Phutamura Chemical Co., Ltd.) having a thickness of 30 μm.

  Table 1 shows the results of evaluation of unsealing properties and resealability of the packaging bags 1 of the above Examples and Comparative Examples.

  The ease of tearing was evaluated by tearing the packaging bag 1 in a direction perpendicular to the second end seal portion 12 by a sensory test by a plurality of examiners. Resealability was evaluated by the ease with which the front surface portion 3 was folded and resealed after opening from the second end seal portion 12 by a sensory test by a plurality of examiners. Each of the evaluations is based on four levels: “very good (◎)”, “good (◯)”, “normal (Δ)”, and “bad (×)”.

  According to Table 1, Examples 1 to 4 were superior to Comparative Examples 1 and 2 in the openability. In Comparative Examples 1 and 2, the straightness of tearing at the time of opening was poor, and the cutting line sometimes extended below the second end seal portion 12. For this reason, resealing may not be possible, and the resealability of Comparative Example 1 and Comparative Example 2 was worse than that of Examples 1 to 4. Moreover, since the laminated body 30 has a metal layer, Example 1 and Example 2 hold | maintain the closed state even if the front surface part 3 is turned back with weak force, and resealability is more than Example 3 and Example 4. It was excellent.

  According to this invention, it can utilize for packaging bags, such as a foodstuff and a chemical | medical agent.

DESCRIPTION OF SYMBOLS 1 Packaging bag 2 Sheet | seat 3 Front part 4 Back part 5, 6 Gusset part 11 1st end seal part 12 2nd end seal part 13 3rd end seal part 14 Back seal part 16, 17 Hem seal part 20 Opening start part 21 Marking 22 Opening opening 30 Laminated body 31 Base material layer 32 Intermediate layer 33 Thermal adhesive resin layer

Claims (8)

  A packaging formed of a laminate having tearability in one direction and including a front surface portion, a back surface portion facing the front surface portion, and a gusset portion connecting the upper end of the front surface portion and the upper end of the back surface portion. In the bag, a first end seal portion in which the front surface portion and the back surface portion are bonded at both side ends, and a second surface in which the front surface portion and the gusset portion are bonded at both side ends in succession to the first end seal portion. An end seal portion, and a third end seal portion in which the back surface portion and the gusset portion are bonded to both ends in succession to the first end seal portion, and the easily tearable direction of the laminate is the A packaging bag characterized by being orthogonal to the first end seal portion.   The packaging bag according to claim 1, wherein the laminate includes a uniaxially stretched film.   The packaging bag according to claim 1 or 2, wherein the laminate includes a metal foil or a metal vapor-deposited film.   The packaging bag according to any one of claims 1 to 3, wherein an opening start portion capable of starting opening is provided in at least one of the second end seal portion and the third end seal portion.   The packaging bag according to claim 4, wherein a marking for instructing opening is provided on the second end seal portion or the third end seal portion provided with the opening start portion.   The packaging bag according to claim 4 or 5, wherein the opening start portion is extended on the first end seal portion.   In the usage method of the packaging bag in any one of Claims 1-6, it tears and opens the said laminated body from the said 2nd end seal part or the said 3rd end seal part in the direction of easy tearing. A method of using a packaging bag characterized by the above.   The packaging bag opened from the second end seal portion or the third end seal portion is folded back at the lower end of the second end seal portion or at the lower end of the third end seal portion. The method for using a packaging bag according to claim 7, wherein the back portion is closed by folding back.

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